CA1138633A - Gunning apparatus for in situ spraying of refractory material - Google Patents
Gunning apparatus for in situ spraying of refractory materialInfo
- Publication number
- CA1138633A CA1138633A CA000333874A CA333874A CA1138633A CA 1138633 A CA1138633 A CA 1138633A CA 000333874 A CA000333874 A CA 000333874A CA 333874 A CA333874 A CA 333874A CA 1138633 A CA1138633 A CA 1138633A
- Authority
- CA
- Canada
- Prior art keywords
- refractory
- nozzle assembly
- conduit
- housing
- outlet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000011819 refractory material Substances 0.000 title claims abstract description 24
- 238000005507 spraying Methods 0.000 title claims abstract description 20
- 238000011065 in-situ storage Methods 0.000 title claims description 19
- 239000000080 wetting agent Substances 0.000 claims abstract description 22
- 239000007921 spray Substances 0.000 claims abstract description 17
- 239000000203 mixture Substances 0.000 claims abstract description 9
- 239000012530 fluid Substances 0.000 claims description 13
- 238000002156 mixing Methods 0.000 claims description 13
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims 1
- 238000013022 venting Methods 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 29
- 230000002441 reversible effect Effects 0.000 abstract description 4
- 230000008878 coupling Effects 0.000 abstract description 3
- 238000010168 coupling process Methods 0.000 abstract description 3
- 238000005859 coupling reaction Methods 0.000 abstract description 3
- 239000003795 chemical substances by application Substances 0.000 description 7
- AYFVYJQAPQTCCC-GBXIJSLDSA-N L-threonine Chemical compound C[C@@H](O)[C@H](N)C(O)=O AYFVYJQAPQTCCC-GBXIJSLDSA-N 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 4
- 210000005239 tubule Anatomy 0.000 description 4
- 230000000712 assembly Effects 0.000 description 3
- 238000000429 assembly Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000002939 deleterious effect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000012774 insulation material Substances 0.000 description 2
- 238000009736 wetting Methods 0.000 description 2
- 101100124609 Caenorhabditis elegans zyg-12 gene Proteins 0.000 description 1
- 101150042033 Copg1 gene Proteins 0.000 description 1
- 101100114422 Drosophila melanogaster gammaCOP gene Proteins 0.000 description 1
- 101100536354 Drosophila melanogaster tant gene Proteins 0.000 description 1
- 101100536931 Escherichia coli (strain K12) thiD gene Proteins 0.000 description 1
- 101100159279 Escherichia coli (strain K12) yajL gene Proteins 0.000 description 1
- 240000002989 Euphorbia neriifolia Species 0.000 description 1
- 229920002449 FKM Polymers 0.000 description 1
- 241000282326 Felis catus Species 0.000 description 1
- 244000228957 Ferula foetida Species 0.000 description 1
- 241000282320 Panthera leo Species 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229920000136 polysorbate Polymers 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- UMFCIIBZHQXRCJ-NSCUHMNNSA-N trans-anol Chemical compound C\C=C\C1=CC=C(O)C=C1 UMFCIIBZHQXRCJ-NSCUHMNNSA-N 0.000 description 1
Landscapes
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
Abstract
TITLE
GUNNING APPARATUS FOR IN SITU SPRAYING
OF REFRACTORY MATERIAL
ABSTRACT OF THE DISCLOSURE
A housing having an interior chamber with an inlet and outlet therto is suspended by a crane within a ladle or furnace having an interior refractory surface to be relined. A feed conduit for conveying dry refractory material entrained in an air stream extends through the inlet into the interior chamber. A
nozzle assembly having a pair of oppositely positioned spray noz-zles is rotatably supported in the outlet of the housing. A con-duit of the nozzle assembly is rotatably connected at one end by a coupling to the feed conduit within the housing and communicates with ring that receives a wetting agent, such as water, from a supply conduit that is connected by a swivel assembly to the noz-zles to permit rotation of the nozzles relative to the supply conduit. Each water ring directs the water into mixture with the air entrained dry refractory materials flowing through the nozzle.
A reversible, variable speed motor is drivingly connected to the nozzle conduit within the housing and is remotely controlled to oscillate the nozzle assembly at a preselected rate through an arc of a preselected angle to apply the refractory material to a worn quadrant of the interior surface.
GUNNING APPARATUS FOR IN SITU SPRAYING
OF REFRACTORY MATERIAL
ABSTRACT OF THE DISCLOSURE
A housing having an interior chamber with an inlet and outlet therto is suspended by a crane within a ladle or furnace having an interior refractory surface to be relined. A feed conduit for conveying dry refractory material entrained in an air stream extends through the inlet into the interior chamber. A
nozzle assembly having a pair of oppositely positioned spray noz-zles is rotatably supported in the outlet of the housing. A con-duit of the nozzle assembly is rotatably connected at one end by a coupling to the feed conduit within the housing and communicates with ring that receives a wetting agent, such as water, from a supply conduit that is connected by a swivel assembly to the noz-zles to permit rotation of the nozzles relative to the supply conduit. Each water ring directs the water into mixture with the air entrained dry refractory materials flowing through the nozzle.
A reversible, variable speed motor is drivingly connected to the nozzle conduit within the housing and is remotely controlled to oscillate the nozzle assembly at a preselected rate through an arc of a preselected angle to apply the refractory material to a worn quadrant of the interior surface.
Description
I
I
. .~
Thl~ lnv-nt~oA r-lato- to qunninSl ~Ipp-,YatU- a~d ~thod for applylng a r ~ractory produc~ ln ~ltu on tl~ intorlor lD ~ur~ac~ of a r fractory ~o~y at ~ Ya~co~ t~ ratur- and ~oro partlcularly to ~ no~ a~-~bly roeat~ly -sppo~to~ ~lthln tho refractory bo~y for ~otat~on ~t ~ o--loctod l~poo~ n a pr~-el~ct~d dlroce~on to app~y th r-~racto~y pro~uct to a ~eloct~d ar~,a o f th- lnt-rlo~ ~ur f ac
I
. .~
Thl~ lnv-nt~oA r-lato- to qunninSl ~Ipp-,YatU- a~d ~thod for applylng a r ~ractory produc~ ln ~ltu on tl~ intorlor lD ~ur~ac~ of a r fractory ~o~y at ~ Ya~co~ t~ ratur- and ~oro partlcularly to ~ no~ a~-~bly roeat~ly -sppo~to~ ~lthln tho refractory bo~y for ~otat~on ~t ~ o--loctod l~poo~ n a pr~-el~ct~d dlroce~on to app~y th r-~racto~y pro~uct to a ~eloct~d ar~,a o f th- lnt-rlo~ ~ur f ac
2. De~crlPtlon o~ t~l~
Th refr~cto~ U~lo~ ~n th~ lron and to~l indu~ltry for cerrylny, holdln~ n~ pourlJtg o~ ~olten ~tal ~uch a~ ~t~llurgical lu~ , bla-t ~UrnaOOJ, oalcln~ plt~, ~upola~
~nd th- llko ar~ oxpo~-a to ~ d ~r~tur~ over ~ lsng l p~rlod D~' U~ hl~t r--ult- iD d~rlor-tl~ o~ Int-rlor I .
~ -3 ~
~ ~ e refr~ctory surf~co. Con-~quantly, the ~urfa~e must oithsr be periodically replace~ or rop~red. The lnterlor ~urf~ce ~ay be rep~irod in a numb~r of way- uch as laylng of refr~ctory brick over the deterloratod ~ur~c0. However, ln order to reduco the labor C08t~ of bric~ l~ylng, the re~ra~tory $ndustry ha~ utilizod high te~p~rature pla~tlc refr~ctorie~ havlng a pliable construc-tion to permit shaplng of the material to the contour of tho ~nterior surace belng relln~d. The pre~h~ped pla~tlc refractory materi~ installed by pn~umatic h~mmers to mold the refractory l~ning ~o the contour of tho interior surfac~. Xt 16 al80 ~nown to util~20 a hoat ~re-i~tant c~stable c-m~nt refr~ctory that 18 installed on the lnt~rlor ~ur~ac~ in ~ m~nn~r ~ r to the ln-st~llatlon o~ conY ~tlon~l ca-table cement. ml. requlre~ a ~ub~t~ntial ~or~ forc~ and th- erection of frames to contain the astabl~ r~ractory c-ment for ~uring.
Mor~ ~om~only ~ho d t~r$orat~d ~ur~ac~ o~ a ladlo o~
l~st furnae~ 18 r~condltloned and repalred by the gunning ppllcatlon of a r-ractory m~t~rlal th~t 1- form~d by ~lxlng a ry mlx of rofractory bind-r ~nd ~ggreg~te propellRd through 08e by ~ stre~m of compras~od elr to a no~zl~ where a wet~ing ~ . ~
1138~i33 agent, such as water, is supplied for mixture with the dry refractory to form a refractory product in a slurry. The refrac-tory product is sprayed onto the interior surface. Typical of such gunning assemblies is the apparatus illustrated and described in United States Patent 3,931,959. However, inherent with this method of gunning, as well as the above described methods, is the problem of cooling the ladle or furnace before the relining oper-ation can be carried out. These methods require the installation personnel to work within the interior of the ladle or furnace;
therefore, the surface to be relined must be allowed to cool prior to the relining operation. Thus, the ladle or furnace must be removed from operation to permit it to cool. This takes a consid-erable period of time which disrupts the steel making process, particularly when the relined ladle or furnace must be reheated to a preselected elevated temperature before restored to operation.
Lining guns for automatically spraying a refractory material upon the interior surface of a ladle or blast furnace, maintained at an elevated temperature, are well known as illus-trated and described in United States Patent 3,797,745. There a pair of concentrically positioned conduits separately supplies dry ~ 5 `~-1 ~3~633 refractory ~terl~ tr~ined in air ~nd a ~etting agent to a ~x-ing nozzle where tho wetting agent i8 ~$xed ~th thR dry refr~c-tory ~at-rial. Thc r~ultant r~fractory prod~ct i8 dl~cbarged fro~ ~ palr of oppo~lt-ly po~ition~d no~zles onto th~ intQr~or ~urfaceO The no~lc ~3~embly ~ ax~ally po~ltloned within the ladle or furnac~ and the discharg~ noszlo~ are rotated a8 th~
a88embly i8 moved from the bottom toward th~ top of the ladle to completely and entir~ly ~pr~y the interior surface. Because the rel~ning operatlGn i~ carr~ed out 8t an elevated temperature the motor $~ sub~ected ~o th~ deleterious e~fects thereof re3ult$ng ~n malfunct~on. In addltlon th~ rel$ning operatlon m~y requ$re that only ~ portion o~ lnter~or sur~ace be relin~d w~th the refractory product a3 opposod to r~linlng the entlre lnt~r$or o~ ths ladle.
United StAtes Patent 3,799,~45 d$sclo~es a re~ote-controlled ref~actory gunn~ng apparatus that include~ a ~ixing head having a refractory ~upply conduit ~onnected to a sw$vel coupling by a water upply t~ to which a wa~er supply conduit ~
connected. A rotat~ble condu~t extend~ down~ardly from the swivel .
coupl~ng and ha~ a nozzlo for spraying tho mlxed refr~ctory and water onto the wall of a ve~sel to be r~l~ned. Unit~d States Patents 2,785,005 and 2,858,836 di~close tank cleaning dev~ce~ $n 1~3~633 which the former utilizes a reversible motor for rotating nozzle assemblies from which streams of liquid are discharged and the latter includes a nozzle head having a plurality of outlets that are oscillated in a vertical plane to spray only the top surface and upper end portion of a tank. Cleaning devices utilizing nozzles for directing a stream of fluid in a preselected direction are disclosed in United States Patents 3,460,988; 3,420,444;
Th refr~cto~ U~lo~ ~n th~ lron and to~l indu~ltry for cerrylny, holdln~ n~ pourlJtg o~ ~olten ~tal ~uch a~ ~t~llurgical lu~ , bla-t ~UrnaOOJ, oalcln~ plt~, ~upola~
~nd th- llko ar~ oxpo~-a to ~ d ~r~tur~ over ~ lsng l p~rlod D~' U~ hl~t r--ult- iD d~rlor-tl~ o~ Int-rlor I .
~ -3 ~
~ ~ e refr~ctory surf~co. Con-~quantly, the ~urfa~e must oithsr be periodically replace~ or rop~red. The lnterlor ~urf~ce ~ay be rep~irod in a numb~r of way- uch as laylng of refr~ctory brick over the deterloratod ~ur~c0. However, ln order to reduco the labor C08t~ of bric~ l~ylng, the re~ra~tory $ndustry ha~ utilizod high te~p~rature pla~tlc refr~ctorie~ havlng a pliable construc-tion to permit shaplng of the material to the contour of tho ~nterior surace belng relln~d. The pre~h~ped pla~tlc refractory materi~ installed by pn~umatic h~mmers to mold the refractory l~ning ~o the contour of tho interior surfac~. Xt 16 al80 ~nown to util~20 a hoat ~re-i~tant c~stable c-m~nt refr~ctory that 18 installed on the lnt~rlor ~ur~ac~ in ~ m~nn~r ~ r to the ln-st~llatlon o~ conY ~tlon~l ca-table cement. ml. requlre~ a ~ub~t~ntial ~or~ forc~ and th- erection of frames to contain the astabl~ r~ractory c-ment for ~uring.
Mor~ ~om~only ~ho d t~r$orat~d ~ur~ac~ o~ a ladlo o~
l~st furnae~ 18 r~condltloned and repalred by the gunning ppllcatlon of a r-ractory m~t~rlal th~t 1- form~d by ~lxlng a ry mlx of rofractory bind-r ~nd ~ggreg~te propellRd through 08e by ~ stre~m of compras~od elr to a no~zl~ where a wet~ing ~ . ~
1138~i33 agent, such as water, is supplied for mixture with the dry refractory to form a refractory product in a slurry. The refrac-tory product is sprayed onto the interior surface. Typical of such gunning assemblies is the apparatus illustrated and described in United States Patent 3,931,959. However, inherent with this method of gunning, as well as the above described methods, is the problem of cooling the ladle or furnace before the relining oper-ation can be carried out. These methods require the installation personnel to work within the interior of the ladle or furnace;
therefore, the surface to be relined must be allowed to cool prior to the relining operation. Thus, the ladle or furnace must be removed from operation to permit it to cool. This takes a consid-erable period of time which disrupts the steel making process, particularly when the relined ladle or furnace must be reheated to a preselected elevated temperature before restored to operation.
Lining guns for automatically spraying a refractory material upon the interior surface of a ladle or blast furnace, maintained at an elevated temperature, are well known as illus-trated and described in United States Patent 3,797,745. There a pair of concentrically positioned conduits separately supplies dry ~ 5 `~-1 ~3~633 refractory ~terl~ tr~ined in air ~nd a ~etting agent to a ~x-ing nozzle where tho wetting agent i8 ~$xed ~th thR dry refr~c-tory ~at-rial. Thc r~ultant r~fractory prod~ct i8 dl~cbarged fro~ ~ palr of oppo~lt-ly po~ition~d no~zles onto th~ intQr~or ~urfaceO The no~lc ~3~embly ~ ax~ally po~ltloned within the ladle or furnac~ and the discharg~ noszlo~ are rotated a8 th~
a88embly i8 moved from the bottom toward th~ top of the ladle to completely and entir~ly ~pr~y the interior surface. Because the rel~ning operatlGn i~ carr~ed out 8t an elevated temperature the motor $~ sub~ected ~o th~ deleterious e~fects thereof re3ult$ng ~n malfunct~on. In addltlon th~ rel$ning operatlon m~y requ$re that only ~ portion o~ lnter~or sur~ace be relin~d w~th the refractory product a3 opposod to r~linlng the entlre lnt~r$or o~ ths ladle.
United StAtes Patent 3,799,~45 d$sclo~es a re~ote-controlled ref~actory gunn~ng apparatus that include~ a ~ixing head having a refractory ~upply conduit ~onnected to a sw$vel coupling by a water upply t~ to which a wa~er supply conduit ~
connected. A rotat~ble condu~t extend~ down~ardly from the swivel .
coupl~ng and ha~ a nozzlo for spraying tho mlxed refr~ctory and water onto the wall of a ve~sel to be r~l~ned. Unit~d States Patents 2,785,005 and 2,858,836 di~close tank cleaning dev~ce~ $n 1~3~633 which the former utilizes a reversible motor for rotating nozzle assemblies from which streams of liquid are discharged and the latter includes a nozzle head having a plurality of outlets that are oscillated in a vertical plane to spray only the top surface and upper end portion of a tank. Cleaning devices utilizing nozzles for directing a stream of fluid in a preselected direction are disclosed in United States Patents 3,460,988; 3,420,444;
3,001,534; 3,858,836 and 2,082,330.
There is a need to provide a gunning apparatus for applying a refractory product in situ upon the interior surface of a refractory body heated to an elevated temperature where the refractory product may be efficiently applied to a limited area of the interior surface as well as the the entire area of the inte-rior surface.
SUMMARY OF THE INVENTION
In accordance with the present invention there is provided a gunning apparatus for spraying a refractory product in situ upon the interior surface of a refractory body that includes a housing having an interior chamber with an inlet and outlet thereto. A feed conduit extends through the inlet for conveying a stream of dry refractory material. A nozzle assembly is rotatably supported in the housing outlet. The nozzle assembly has an inlet positioned within the housing and an outlet extending from the housing. A supply conduit conveys a wetting agent to the nozzle assembly for mixture wîth the stream of dry refractory material to -" ~138633 form a spray of refractory product from the outlet of the nozzle assembly. The nozzle assembly has a mixing chamber portion for receiving the wetting agent and air entrained dry refractory material to orm the refractory product. The mixing chamber is positioned adjacent to the nozzle assembly outlet. A swivel assembly connects the supply conduit to the nozzle assembly to permit rotation of the nozzle assembly relative to the supply conduit as the wetting agent is conveyed through the supply conduit and the swivel assembly to the nozzle assembly. Conduit means connects the swivel assembly to the mixing chamber to convey the wetting agent from the swivel assembly through the conduit means to the mixing chamber for mixture with the dry refractory material. The conduit means is connected to the swivel means to permit rotation of the conduit means relative to the swivel means. A drive mechanism is supported within the housing and is connected to the nozzle assembly for rotating the nozzle assembly at a preselected speed in a preselected direction to apply the refractory product onto a preselected area of the interior surface of the refractory body.
The housing is suspended from a crane and is positioned axially within the refractory body, such as a ladle or blast furnace, having an interior refractory surface to be recon-ditioned by applying the refractory product to the deteriorated portions of the interior surface. The supply of dry refractory material and wetting agenet, such as water, to the nozzle assem-bly is remotely controlled, as well as the rotation of the nozzle ~ 1~3~}633 A~ embly . me dry r~ractory ~terl~ conveyed from ~ ourc~
by a stream of air t~at i~ oonducted through the feed conduit at a preselectOEd volu~ ~low r~ts Rnd ~t ~ pr~elected pres~ure. In this manner the dry r~fr~ctory met~rlal 1~ ~onv~ye~ ~n ~ stre~
to th~ nozzle a~s~bly. The w~tting agent i~ conduct~d through the supply conduit ~h~ch 1~ conn~cted ~t th~ outlet end portlon thereof to th~ ~wivel a-Jembly.
On~ embod$~ent o~ th~ swlvel a~sembly include~ ~ fixed or ~tatlonary tubular po~t~on which i~ ~ecured to ~nd extends downw~rdly ~rom th~ outl~t of the hou~ing in suxrounding r~lation with t~e nozzle a~mbly. Th~ nogzle assembly 1~ ro~atable r~la-tiYa to t~e tubul~r portion which i8 nonrotatable. The tubul~r port$o~ has ~n openlng connected to the outlet end portion of the water supply conduit. The water supply ~onduit passe~ through the int~rior of t:he hou~ln~ and exit3 therefrom adjacent the outlet o~
the housing. A rotatable portion of the swivel hssembly i8 nonrotatably conn~ct~d at a low~r end ln surroundlng relation w~th the nozzle a~sembly below the tubu~ar por~on. The rotatabl~
or~ion h~s an uppar end rot~t~bly poYltlon~d on tha tubular por-:
t1on and ~ncludes a ~luid chamb~r commun~cating with ~ho op~ning n th~ tubular port~on. A pa~r of condu~ts ~cured to th~ rot~t-bl~ portion oonvey~ t~ wet~ing agent, which pas~e~ ~roM th~
ubular portion opening to tho fluid ch~mber, from th~ 8WiVRl 3 88embly to a p~ir of Jpray noszles o~ the nozzle ~s~embly for ixture wlth th~ dry xefr~otory material.
' , Prefexably, the nozælo assembly lnclud~s ~ palr of op~o-sitely poslt~onod ~p~ay nozzl~ that are e~ch thre~dedly eng~ged to ~ water r~ng. Tha wat~r ring i8, in turn, threadedly engag~d to a cap portion ~t th~ b~s~ o~ the noz21~ a~sombly. ~he cap por-tion lncludes lntorn~l pa~ageway~ th~t convey th~ ~ry refractory material to the re~psctiv~ water rings. The wet~ing ~gent 1~
conveyed to the wator ringa from Ywivel a~embly by the pair of condults. Thc wetting agen~ and dry r~fr~ctory materlal are mixed in the w~ter rinq~ to form th~ refractory product. The ~pr~y ¦ nozzle~ are positloned opposlte one ~nother to direct ~ spr~y of the refractory product outwardly from tho c~nter ~xl~ of ~he refr~ory body onto tho interio~ 3ur~ce ther~o~.
The driYe mechani~m includes a reversible, vari~ble speed air ~otor t~at i8 ~upported within the housing and ~nclude~
a drive sha~t that i8 dr~vingly connected by a belt through a drive pulley and a dxiven pulley to the co~dult o~ the nozzle a~sembly insid~ the hou~lng. The rate of rotat~on of the no~zle l assembly i~ v~rlablo and i8 selectively controlled. The direction ¦of rot-tion, 1 e. clock-tlD- or oontercloc1cwl~o, ~ well ~ th-l . .
I .' . .
~ -10-~ ~;; ~ ~ e 1 1131~633 rate of rotation, i~ remotely controlled 80 that the nozzle .
assembly may be rot~ted in a preselected direction ~t e r2te of rotation between about 1/2 to 30 revolution~ per m~nute.
Once the nozzl~ ~ss~mbly is axi-lly po~itioned within the ladle or furnac~ to locate the outle~s of th~ spray nozzle~
oppositely of th~ polnt of application, the noz~l~ a~ombly may be rotat~d ln ~ ~elected dlrection to provlde a clrcular spray and uniformly coat th~ entir~ interior aur~ace. On th~ other hand, the dire~tlon of rotation of the no~zl~ a-sembly may be rever3ed to o~eillate the spray nozzles b~c~ and forth through an arc of a preselect~d ~ngl~ to apply the ~pray to a pre~elected area or quadrant of the inter~or surface. W~th thi~ arr~ngement the rotational speed ~nd r~ta of revers$ng the directlon of ro~ation i~ variable. This operation i8 par~icularly deslr~ble when only a portlon of the lnterior surface requires repair by relining.
ll;~Y633 ~? ~
The refractory product i5 applled to the inter~or surface of the refractory body at th~ elevated operAting temper-~ture o~ the body. ~y conductlng the gunning operat~on ~t an el~vated temp~rature, it 18 not n~c~s-ary to cool th~ refractory body before th~ gunn~ng oper~tlon i9 carrled out. To protect the driv~ mechanl~ ~ro~ th~ d~leterlou~ af~ct~ o~ the high te~perature withln th~ ladle or furn~c~ th~ int~rlor surfac~ o~
the hous~ng i~ lln~d ~ith 2 Ju~table in-ulat~on mater~al. In addition, th~ motor 1~ ~alntalned at an ~fflcl~nt operating temperature by conduotlng air ~nto thÆ hou-lng fro~ ~n a~r 3upply conduit. A v~ntilation port i~ proviaod ln th~ houslng 80 th~t the air circul~tcs throughout the lnterlor chamb~r of the hous~ng and around the motor to mainta$n the motor at a presel~cted operating ternperature.
A~cordlngly, the princlpal ob~ect o~ the pre~ent ¦ inventio~ is to prov~de a gunning apparatus for ~praying a refractory product ln situ upon the lnt~r~ox ~uxface of a refractory body by a nozzl~ a~sembly that i3 posltloned within the body and rotat~d at a pre~elected ~pe2d in n pre~elected directlon to apply tha re~ractory product up~n a ~lected port~on of tb~ int~rior surao~.
. . l c ~ ~
~ 3~1Ei 33 Anothor o~ct of t~.precent ~nventlon ~ to pro~ide a gunning apparatu- that penmit~ the remote appllcation of a ¦refractory product upon tb~ ~nterio~ ~urfac~ of a r~frac~ory body ~uch as a ladl-, blast furnac~ and th~-liko by rotat$ng a nozzle a~sembly ~t ~ pr~select~d rate ln a pre~elQcted dlr~c-tion to apply th~ r~fractory product upon th~ interior ~urfac~
of the body and th~r~by rep~lr the intorlor Eurfac~ m~int~$ned at ths elevated op~rat$ng t-~p~rature of the refractory body.
¦ A further ob~ect of the pre~ent inY~ne$on 18 to Iprovlde ~ gunnlng appar~tu~ that include~ a ~wlvel as~em~ly for con~e~tlng the wat r upply condu~t to the nozzle ~8~embly to per~it rotation of the no~ assembly relat~ve to th~ water 8uppl~
conduit as water o~ any oth~r ~uitable wettlng ~gent i8 conveyed to the nozzle as~Qm~ly.
~ he~e and other o~ects of the present ~nventlon w$11 be more complet~ly aisclo~ed and de~cr$bed ln the follow~ng ~pecification, the ~ccompanying dxawing~ ~nd the ~ppended claim~.
~ , . _ _.---' t~' 1~3~633 BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a view in side elevation and partially in section of a gunning apparatus for applying in situ a refractory product to the interior surface of a refractory body illustrating one embodi-ment of a swivel device for connecting the water supply conduit to the nozzle assembly.
Figure 2 is a view similar to Figure 1, illustrating another embodiment of the swivel device.
Figure 3 is an enlarged fragmentary view in section of the swivel device shown in Figure 2.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to the Figure 1 there is illustrated a gunning apparatus generally designated by the numeral 10 for applying in situ a refractory product to the interior surface of a refractory body, such as a metallurgical ladle used in the carrying, holding and pouring of molten metal, high temperature furnaces, such as oxygen vessels, open hearth furnaces, blast furnaces and other refractory installations, such as soaking pits and cupolas, to recoat or reline the deteriorated interior surface of the refractory body.
The gunning apparatus 10 includes an elongated ~, ~ 113~633 hou~ing 12 having v~rtical cyllndrical slde walls l~ with a cover plate 16 and a conical bas~ 18 secured to oppo~ite end~ of the slde wall~ to ther~by fonm an inter~or ch~mber 20. A pa$r of eyel~t~ 22 are ~ocured to and extend upwardly fro~ the cover plat~
16. Th~ gunning appar~tu~ lO i~ su~pended above th~ refractory body by hooks ~ngaging the eyalets 22 and lowered by a cable fed from an ov~rhcad cr~no. Sn thlB manner, the housing 12 ~ ax~ally lowered into tho refractory body for movement through the intor~or : ¦thoreo~ as the refractory product i- ~pr~yed onto tho cntl~
¦interior surfac~ or onto ~ ~slect~d ~rea theroof ln ~ccordance ¦with ths pr~s~nt in~ntlon.
I ~h~ gunning appara~u~ lO $8 low~rsd into th~ opon ~nd ¦yortion of th~ hot ladl- or b~ast furnac~ ~nd is op~r~ted from a : I control panel po~lt~on~d remote of tho gunnlng location. The cover plate 16 lnclud~- ~n inlet 24 through ~hich a mat~rlal feed .
conduit 26 extends. Th~ upper ~nd portion o~ condult 26 pro~ects ~rom th~ houslng ch~b~r 20 and i8 connect~d to an ~long~ted flexlblo conduit 28 whioh communlcates ~t lt~ oppo~lte end (not I shown) with a pre~aur~ ch~mb~r containing dry granular refractory ZO ¦¦ls~terlAl. ~i undsr Pre--ur- l~ conducecd ~ro~ ~ co~pr~ssor lnto ¦
l . l '. ' 113E~633 the ch~mbor and ln g w~ nv~n manner th~ dry r~fractory mater~al i8 ~ntralned ln the ~lr ~trea~ ~nd conv~y~d from tho ch~mber through conduit 28. Tho gunnlng operator control- the fe~d of thc r~frA~tory ~t~r~al entrain~d ln ~lr through ~he eondul~ 28.
From the conduit 28 the rsfr-ctory mat~rial passe~ to the feed condu$t 26 w~ich ~ connected by a rotary coupllng 30 to a nozzlo a~embly g~nerally deslgnat~d by the numeral 32.
The nozzl~ ao2~mb1y 32 i8 rotatably ~upport~d with~n an ou~let 3~ o~ hou~ing 12 by a sleev~ bearing 36. ~he nozzl~
asse~bly 32 ~nclude- on~ or ~ore outlets 38 from which n r~frac- .
tory product i~ sprAy~d onto thei*terior ~urfac~ of th~ ladle or furnace. Th~ refr~ctory product i8 fonm~d by the addition of a wetting agent, such as wat~r, to the str~ of dry refr~ctory material in th~ noz~lo a-sembly 32. W~t~r i~ suppliRd to the nozzl~ as~mbly 32 through a wator ~upply conduit 40 h~ving a su~table length to ~xeend fro~ a ~ourc~O The operator of th~
gunnlng apparatus 10 oontrol~ tho flow o~ w~ter through conduit ~0 by a valve at the control p~nel ~not shown). ~h~ w~ter supply conduit 40 h~ an and portion 42 that 1~ connected by ~ swlvel echani~m 4~ to tha nozzle a~aembly 32. Th~0 per~lt~ tho nozzle ¦assembly 32 to rotate relatlv~ to the wat~r ~upply conduit 40.
~ I
113E~633 Th~ noz~le aasembly 32 include~ a condult 46 that 1~ .
conneeted to tho rot~ry coupllng 30 to p~r~it rot~tlon of the co~-duit 46 withi~ th~ housing 12. Tho rotary ~oupllng 30 $ncludes ~ealed pa~ageway for the ~low o~ r~ractory mat~ri~l from the feed conduit 26 to tho conduit 46. Wlth this arr~ngement th~ con-duit 46 i~ rotatabl~ w~th~n t~e hous$ng 12 a8 th~ feed condu t 26 remain~ station~ry within the houslng 12. ~he outlot 34 o~ the housing 12 is ~xially al$gn~d with the inle~ 24. The con$c~1 ba~e . 18 o~ the hou~ing 12 convergos ~nwardly from th~ cylindrical si~e-wall~ 14 to an opening 48. A flanged ~ ve member 50, welded to the conical ba~e 18, i~ poJition~d wlthin th~ op~ning 48. Th~
~lanqed ~leeve m~mba~ 50 ~- axl~lly ~upport~d withln the openi~g ~8 and includes a pa~figeway 52 to form th~ outlet 34 of the hou~-ing 12. The sleeve bearing 36 ~ supportod by tho sle~ve m~mber 50 and ~nclude~ a bor~ 54 through which ~h~ conduit 46 of the noæzle a~sembly 32 ext~nd~. The sl~ev~ bearlng 36 rota Wbly 8Up-rt- the ~ondult J6 ~lthin thu houuing outlet 3~.
~i . l - 17 _ . ~
1~ ~ ~
Th :r~ r nd portlon o~ eh~ condult ~6 1- threadedly- ¦
connect~d to ~ cap 56. The cap 56 includo~ an lnlet 58 surroundln~
tha ~nd of condult 45 ~nd a pair of outlets 60 that are angularly displaced relatlv~ to the lni~t 58. ~h~ cap 56 includes Rn lntcr-nal pas~ageway that connect3 the lnlet 58 with ~he outlet~ 60.
With ~his ~rrangemont the alr en~ralned, dry refractory materlal flow~ from ths fe~d conduit 26 lnto the nozzle condult 46 and therefrom to the cap 56. ~h~ dry refrActory ma~rial i8 dlrected through the internal passageway o~ the cap 56 to th~ re~pective ¦outlets 60. The outl~t~ 60 ~re ~ubstantlally at r$ght angles to the inlet 58.
A water ring 62 i8 thread~dly ~cur~d to ~ach o ~h~
outlets C0 of th~ cap S6. Each water rlng 62 lnclude~ an.inlet port 64 that communicatos wlth circumforontl~l p~-sagewAy surround~ng an axlal pa~-~gew~y. A plurallty of rHdially po81-tioned apertur~ conn~ct ~ho circumfer~nti~l p~ag~ay wlththe ~xial passageway. Th~ lnlet port~ 64 ~r~ connoct~ by a toe conduit 66 to tho ~wlv~l mechanl~m 44. Th~ ~w$v~ chsni~ ~4 ~8 colmected to a branch condu~t 68 of t~o t~ condult 66 to p~mit ~0 the te~ condu~ to ro~ r~l~tlve to tho wivol m~ch~ nd the wat~r supply conduit 40.
-18- _ 1~3~6;~
The wetting agent, preferably water, is supplied by conduit 40 to the water rings 62 and through the internal apertures thereof into mixture with the air entrained stream of dry re~ractory material. In this manner the water rings 62 serve as mixing chambers for the water and refractory material to produce a refractory product in slurry form. A spray nozzle 70 is threadedly engaged to each water ring 62 and includes the outlet 38 of the nozzle assembly 32. The refractory product passes through the nozzles 70 and is emitted in a spray from the outlets 38. Preferably, as illustrated in Figure 1, the nozzle assembly 32 includes a pair of spray nozzles 70 that are oppositely positioned and supported by the water rings 62 to project downwardly at an anyle to facilitate spraying the base and lower portion of a ladle.
Also, this arrangement cancels any resultant thrust applied to the nozzle assembly 32 that would tend to displace it from an axial position within the housing outlet 34~
The nozzle assembly 32 is rotatably supported within the outlet 34 of housing 12 for rotation of the spray nozzles 70 in a preselected direction at a pre-selected speed to uniformly apply a layer of the refrac-tory product of a preselected thickness upon the interior surface of the refractory body. A pulley 72 is nonrotat-ably secured to the end of the inlet conduit 46 adjacent 113~6;~3 the rotary coupling 30. The pulley 72 is drivingly connected to a drive mechanism generally designated by the numeral 74 to rotate the inlet conduit 46 and the entire nozzle assembly 32 at a preselected speed and in a preselected rotary direction.
The drive mechanism 74 preferably includes a reversible air motor 76 that is suitably supported within the housing 12 and receives air flow through a conduit 78 that passes through an opening 80 in the housing cover plate 16. The conduit 78 is connected at the opposite end to a remote air source and the controls for the motor 76 are also provided at the remotely positioned control panel. The motor 76 includes a housing 82 which is suitably supported in the housing 12. The air motor 76 rotates a drive shaft 84 at a variable preselected speed in a preselected direction. Also, the frequency of reversing the direction of rotation of the drive shaft 84 is variable. A pulley 86 is secured for rotation with the drive shaft 84 and rotation of the pulley 86 is transmit-ted by a drive belt 88 to the pulley 72. The drive belt 88 extends around the pullevs 72 and 86 to transmit rotation of the motor 76 to the nozzle assembly 32. It will be apparent that an electrically operated motor may be used in place of the air motor 76 of the present nvention.
113~3633 Now ref~rrlng to Figur~ 2 and 3 where li~ numerals .
raised by 100 refer to llke p~rts illustrated in Flgure 1, ~here 1~ lllu~trAted a ~cond ~mbodi~ont of the ~wlvel ~eehnni~m generally d~ignated by th~ numeral 144. ~h~ ~wi~el mechanism 144 connects the water supply conduit 1~0 to the nc~zle a88embly 132 in a ~anne~ to permit rotatlon of the nozzl~ as~mbly 132 relative to the condult 14G a- water, the wettlng agent, ~8 conveyed to the no~21e ~Ds~mbly 132. me water ~upply condu~t 140 extends through an opening 96 in the hou~lng cover plat~ 116 ~nd extend~ through the interior chamber 120 of the houslng 112 to an openins 98 i~ the conlcal base 118 of the houslng ad~acent the hou~ing outlet 134. The ~ondu~t 1~0 extend~ from th~ open~ng 98 and i~ connect~d at lts outlet end portlon 142 to the ~wivel a~embly 144.
Thn ~wlvel a-~mbly 144, a~ lllu~trat2d ~n greater detail in Figuro 3, lncludes ~ first ar fixod portion g~norally deJignated by tho num~r~l 111 ~hich is ecured to the hou-$ng 112 surrounding th~ outl~t 134 thoreof and a second or rotatablo portion generally de~ign~t~d by tho numeral 113. 5h~ rot~tabl~
portion 113 i~ rotatably conn~ct~d at ono ~nd to tha ~ixod port~on - 21 - .
c ~
l ~138633 111 and at an oppo~lto end i~ connected for rotation with th~
inle~ conduit 146 of th~ nozzl~ R~sombly 132. The ~ixed port~on 111 and th~ rotatabl~ portlon 113 haY~ co~municatlng lnter~l pa~sageway~ ~or con~ ylng the wottlng ag~nt ~ro~ th~ supply conduit 140 througb t~ ~x~d and rotat~ portlon- 111 And 113 to a p~r of condult~ 115. q~e condults 115 ~r~ ench connQcted at one end to outlat- of th~ rotatablo portlon 113 and at ~n oppo~$t~ end to th~ ports 164 communicating with the ~ixing chasn~er~ of ~he w~t~r ring~ 162. ~ccordlngly, wat~r i~ mixed wlth th~ dry re~ractory material in th~ mixlng chambers of th~
ater rings 162 to produce th~ refractory produ~t that i~ sprayed in a slurry for~ ~ro~ the nozzle~ 170, ~8 described herein~bove.
¦ Th~ fixQd portion 111 of the swivsl a~em~ly 144 include a plate member 117 that is positioned ~n ~butting relation w~th a ¦flange portion 119 of the ~ ve member 150 that i8 ~ecur~ly positioned in the hou~ing opening 148. The plat~ ~e~ber 117 and the fl~nge portion 119 includo align~d, thr~aded bore4 through whi~h bolts 121 ~ro threadodly advanc~d ts con~ect th~ plat~
m~mber 117 to the flang~ portion 119. ~ho plat~ 117, ~ lllu8-' ¦ tr~ted in Figuro 3~ includ~o an upp~r annular portlon 123 h~vinq l - 22 -, . . . . .. ..... . .
113!3633 an annular recess 125 ~nd a low~r annul~r portion 127 having a -bore 129 ~herethrough. mO lower end portion o~ th~ 6~eev~ 136 ext~n~s throug~ tho bore 12g. Conv~ntlonal lubr~c-nt ~al~ 133 Ar~ posltionod ln thR r c~-~ 12S b~two~n tho 81~ 136 an~ ~ho upper annular portlo~ 123 to prov~d~ ~ lu~ricant s~al betwæan tha plat~ memb~r 117 and th~ Y~ 136. A~ d~-cribe~ above, the inlet conduit 146, t~at conveys the dry re~recto~y ~aterl~l to the water ring~ 162, ~xt~nds throu~h the ~1~QVe 136. Prefcrably, an annular groove 1~ ~ormed on th~ out~r cylindric~l ~urface of tho ~nl~ con~u$t 146 oppo~ite the leeve 136, and a convention~l o-r~ng ~e21 135 1~ poaltioned in the annul~r groove to provid~
~e~l between th~ ~le~v~ 136 and the inlet conduit 146.
The flx-d or ~tatlonary portion 111 o~ the ~wivel ~ssembly 144 ~lio l~clud~s a tubular extension 137 that is secured ~t upper end portion 139 to tho lower ~nnular portion 127 of the plat~ member 117 in a ~uitabl~ mann~r, ~uch n~ by w~ld$ng a~
indic~ted in Figur- 3. ~h~ tubular ~emb~r 137 ha- nn axlal bore 141 therathrough, and t~e upper portio~ of th~ b~re 1~1 i8 positioned in surrounding rolation with tho low~r ond of th~ ev~
116. ~8 lllu~ rat-~ ln Flqur 3, th~ ln-lde dl _ t~ of th-Il I .
I' , ~ - 23 - ' ~ ~
. I ~ ~
1 ~3~3~33 tubular member 137 1J great¢r than the outer dlam~ter of the sleeve 116. Th~ tubular ~e~ber 137 includo~ an opQnlng 143 extending through th~ wall of th~ member 137 ana l~to the bor~
141. Th~ tubular mRmbar 137 1~ al~o concentrically po3itloned with re~poct to th2 ~nlet condu~ 146. With thls arrangement, an annulus 145 is ~ormed botween th~ inn0r cyllndrical surface of the tubular member 137 and the outer cylindric~l surfa~e of the inlet conduit 146. The ennulu~ 145 com~unicate~ with th~
opening 143 ln tho tubular member 137. Tho end portion 142 of the wat~r supply condult 140 i~ conn~cted to the flx8d portion 111 of the 8wivel aJsembly 1~4 and preferably i~ conne~ted to the tubular memb~r 137 in th~ opening 143 ~o that wat~r i8 con~
veyed from th~ conduit 140 through the openlng 143 and lnto the annulu~ 145.
The rotat~ble portlon 113 of thc swivel assembly 144 $s rotatably po~ieloned on the tubular member 137 of the fixed portion 111. Thu-, the tubular member 137 19 ~t~t$onarily po~ltioned relatlv0 to th~ noz~le a~embly 132. Th~ ro~tablc ort~on 113 ~n~lud~- a flrst ~amber 147 ~nd a s~ond me~ber 149 t~at ~ removably conn~ted to the flr~t m~mb~r 14? by bolt~ lSl engag1ng allgn~d thr~4d~d boro~ 153 ~nd 155 of th~ flr~t and second meMbers 1~7 ~nd 149 r~p~ctl~cly.
2~ - . .
. i, 11 ~
1 ~138633 The f~rst ~omber 147 of the rotatabl~ portion 113 inelude~ an upp~r cylindrlcal portion 157 and ~ low~r flango portlon lS9 ~xt~n~in~ r~d~lly outw~rdly fro~ th~ cyllndrlcal portion 157~ ~h~ cyllndrleal portion 157 has an lnwardly pro~cting ~nnul~r houldor 161 having ~ bor~ 163 therethrough.
A lowor ~nd portlon 165 o~ th~ tubular m~mb~r 137 oxte~ds through tho ~orc 163 $n ~buttlnq rolation with ths annular ~houlder 161 and oxtend~ downwardly ther~from. With thi- ~rrange~ent, an annulus 167 i~ for~d abov~ the annul~r hould~r 161 betwe~n thQ
tubular ~ember 137 ~nd th~ cylindrlcal portlon 157, and an annulus 169 is for~od b~low the Annular ~hould0r 161 betwean the tubul~r me~er 137 and the ~ylindric~l portlon 157.
A bea~lng d~vlco, ~u~h a~ a bronz~ bu~hing 171, i8 pres~ fitted into ~ngag~ment wlth tho cyllndric~l portlon 157 in tho annulu~ 167 and 1- ~rrang~d for rotation wlth the first ~e~ber 147 of rot~ Wble portlon 113 rælative to th~ tubular m~mber 137.
conven~lonal lubr~cunt fittlng 173 ext~nds through th~
cyl~ndr~cal portiQn 157 and tbo bushing 171 l~to communlcation ~lt~
the spac~ betweon t~ lnnor cylindrical ~urf~ce of th~ bu~hlng 171 and the ad~cent outer cylindric~l surface o~ th~ tubular ~ mb~r 37. With thi~ ~rr~g~mont, ~ ~uitabl~ lubric~nt i8 4upplied ~0 thls ~pac~ to fac$11tat~ rot~tion of th~ rotatabl~ portion 113 relatlv~ ~o the flxe~ portion 111 of th~ le~v~ ~se~bly 144.
l - - ~
l 1~38633 To prov~de a ~u~tabl~ ~eal b~tween the ~nnular should~r 161 and the low~r ~r~d portlon 165 of tu3:~ular me~ber 137 ~uitable 0-ring typ~ ~eals 175, uch as co~nerc~a~ ~vail~ Viton 8~al~, ~r~ positionod in ~ ~nnulu~ 169 b~low the annul~r ~hould~r 161.
~rhe seal arr~ng~mont preY~ntJ ~low sf water ~rom the annulu~ 145 up through the cylind~c~l portlon 157 botff~n th~ cyl~ndr~cal portlorl 157 and th- tubul-r m~ber 137.
Th~ flr~t and ~cond memb~rs 1~7 and 149 o~ thc rotatabl~ portio~ 113 a~ connected to ~on~ ~n ~t torior fluid cha~ber 1~7. Th~ flui!d chamb~r 177 com~un~cat~s wlth ~h-annulu~ 145 which ~erv~ a- a ~luid ch~er for tll~ ~low of _ ~ttirlg agent thor~to fro~ the outlet 142 of th~ supply conduit 140. lq~e second m~m ~ r 149 inc:ludes a circular plat~ 179 ~nd a lower tubula~ poxt~on 1~1. Th~ tubular portlon 181 extends downwardly ~r.om and 1~ axially allgned ~th the clrcular plato 179. A bore 183 ext~nd~ ~xlal~y through t~e pl~t~ 179 ~nd tubul~r portion 181. ~he ~nl~t condult 146 ~xt~nd~ through the bore 183.
Set scrows 185 xt~nd through th~ ~ubular portlon 181 and lnto the wall of th~ lnl~t conduit 146 to nonrotatably ~onn~t thR
tu~ular por~on 181 to th~ inlot conduit 1~6. ~n t~l~ manner ~he ro~atable port~on 113 1- conn-cted to tho inl~t condu~t 146 80 that th~ rotatabl~ port~on 113 rotate~ w~th the lnlet condu$t 1 ¦b~ op~r~t~on o~ th- drlv~ mechani~ 17~ a~ ~bove al~cu~ed.
~ ~ 2~ -she plae~ 179 inclu~e~ nnul~r ~houlder 187 ext-nd~ng~
into tho ~luid ch~mber 177. Thc annular ~houlder 187 fonms a r~ce~s portion 189 wi~h th~ upper surfac~ of plata 179, and ~ui Wblo O-ring typo sR~lJ 191, such a~ ~o~m~rci~lly availDbl~
Molythan~ Polypa~ 18, ~no po-ition~d 1~ th~ ro~e~ 189. ~h~
~e~ls 191 in ~ho rccs~ 189 ~alingly eng~g~ thQ outer cyllndri~l surf~ce of th~ ~nl-t ~onduit 146 opposi~e th~ annu~ar should~r 187 to prevent wat~r and/or r~fractory matarl~l fro~ p~slng b~tw~en the inlet ~ondult 146 and th~ tubu~r portlon 181.
Th~ pl~t- 179 ln~lua~ a p~lr of openings 193 ~xt~nd~ng th~rethrough and a~apt~d to rec~ive thA uppor ond~ of the pal~
of conduits llS, re~p~c~lvely. The opposite end~ o~ th~ conduit~
115 ~re connect~d to t~ ports 164 th~t op~n lnto tho mixlng chambers of t:h~ wat~r ring~ 162 to conv~y the wetting agent from ¦the fluid ch~mb~r 177 through the openings 193 and conduits 115 Ito tho rlng~ 162. ThuJ, w~th the above deacribed 4rrang~mænt tho ¦wet~ng ~gent i8 ~on~oyed by th~ ~upply conduit 1~ ~hrouqh the ¦opening 1~3 into ths ~luid ch~ber or ~nnulu~ 145 o~,~hQ ~wivRl l a~embly fixed por~io~ 111 and i~ con~y-~ ~rom tho ~nnulu~ 14S
Ito ch~b~r 177 an~ th~ op~nln~ 193 into th~ con~ult~ 115. Sb~
~onduit~ 115 ~onv~y tho wettlng ~gent ~o th~ ~ixln~ ~ha~b~r~ o~
! th~ ring~ 162 whers th~ ~ottlAg a~ent i~ mlxed wi~h t~ dry a~ ~
~3~3633 refractory ma~erial convey~d from the $nl~t conduit 1~6. The wet~ng agent and dry refr~ctc~ry materlal ar~ mix~d to fo~o a r~fraceory pro~lu~t ln slur~y form that i~ ~praycd from tho nozzles 170. 'rhu~, ~it:h t~ bov~ des~rib~d arrang~nt the ~upply condu~t 14a 1~ CoJ~CtQI~i ltO ~h~ noz21~ ax-ombly 132 by th~ ~wiv~l as~mbly 144 in a m~aner to pormit the no~zlo a~embly 132 to rot~te relat$v~ to th~ ~upply condu$t 140 ~ th~ t~ir g aslent 1~ convey~d to th- no~21e ~s-~bly 132.
¦ The r~linlng op~r~t$on carriQd out by thH guhn~ng ¦ apparatu~ 10 $11u~trat~d ~n Flgure~ 1-3 ~a con~uct~d $n ~$tu at ¦th~ elevated t~mper~tur~ o~ th~ re~ractory body a- oppos~d to tho ¦convent~on~l praot~co o~ removing tho r~f~ctory b~dy, ~uch as a ladle or furnac~, fro~ opera~ion ~nd cooling lt. Th~ ~oll~w~ng des~r~ption o~ the me~hoa of op-ration ~ the present $nvention r~fer~ to the embod~ment ~llu~trated in Figuro 13 however, it should b~ und~r~tood that th~ d~scr~bed ~thod of op~ration al~o applie~ to tho embodi~nt illustrated ln Figure- 2 a~d 3. Th w , referene~ i8 ~ade to tho ~bo~iment of Flgurn 1 only fo~ conv~nlen~ 8 ~nd brevity. Tho hou-~ng 12 i~ ~usp~ndQd by a cranQ and lo~srod, for exa~pl~, ~nto ~ l~dla ~hi~h 1~ malnt~ln~d a~ lt~ operstin~
~- 28 ~13~3~33 temperature which may be in excess of 900 F. Because the housing 12 is subjected to excessive heat the interior components and particularly the drive mechanism 74 are protected by insulating the walls of the interior chamber 20 with a suitable insulation material 89.
Further, in order to protect the motor 76 from the deleterious effects of the surrounding heat, air is injected into the chamber 20 through an air supply conduit 90 that extends through an opening 92 in the cover plate 16. The end of the conduit 90 is retained within chamber 20 and the flow of air through the conduit into the chamber is controlled by the gunning operator. An oulet port 94 in the housing 12 promotes the circulation of air through the chamber 20 and around the motor 76. The air flow is also promoted by the cylindrical configuration of the housing 12. With this arrangement air is supplied to the housing chamber 20 to maintain the motor 76 at a temperature to ensure efficient operation. Figure 2 also illustrates a corresponding insulation material 189, air supply conduit 190, opening 192, and outlet port 194.
.~' _ 11;~633 ~ he operation3 of ~upply~ng th~ ~ttlng agont to the -nozzl~ n~sambly 32 through th~ ~upply conduit 40~ turnlng th~
~o~or 76 off and o~ to rotat~ the nozzlo a~mbly, ~nd controlllng th~ dir~tlon of ~t~tlon and ~p~d of ro~a~ion of ths no2zl~
as~mbly ~r~ controlled from a control panol which 1- pr~rably locat~d at a po-ition ~t~vat-d ~bov~ th~ r~r~ctory body belng rellned. Fro~ thl- locat~on th~ ope~tor 1- in a po~it~o~ to obuer~e the r¢llnlng op~r~tion. Th~ op~ration~ o~.~upply~ng alr ~or ~ooling th~ int~rlor of chamb~r 20 o~ ~h~ houslng 12 ~nd convcying the ~ry r-fractory material ~ntralned ln ~lr through the conduit 28 tc tho nos21~ a~ bly 32 ~r~ controlle~ ~y tho gun operator who ~8 al~o po~itlon~d rom~t~ of th~ refractory body.
In$ti~11y, tb~ gunnlng apparatus 10 ie axlally po-~-tioned within the interior o~ the re~ractory body by lowerlng the housing 12 supportod by a crane at the lifting eyelot6 22 lnto the body. The gunning oper~tion may include a tot~l recondition$ny f the refr~ctory body by 2pplying th~ rafractory product to the ntir~ ~nterior surfoc~. ~or thiJ oper~tion th~ hou~ing 12 i~
ither lowered ~t a controll~d rat~ ~nto th~ body a~ th0 refra~-ory produet i8 ~prayod onto tho lntorlor surf~co, o~ i~ th~
I alt~rn~tiv~ th~ hou-ing 12 ~y b~ po~lt~on~d ~t ~ha lowe ~t 11;~8633 position within th~ ~ody and then rai~ed vo~tically as the inte~
¦ rior ~urface i- ~prayed. Ho~v~r, for both metho~ once the hou~ing 1~ selectl~r~ly posltloned wlthin ~he r~Erac:tory body, th~
w~tting a~ent i~ ppllod to tb~ nozzl~ ~s~embly 32 through t.he ~upply co~duit 40 ~n~ th~ no~le a~sembly 1~ rotat~d ~It a pre-l~elected sp~ed ~ n a pre~elected dir~ction . The~ th~ gunning op~r-ator f~ t2~e air entrAined dry refractor~ m~t~ri~l through th~
conduit 28 So t~ noz21a a0-e2~ly 320 Also, at thi~ 'cime air 1-I ~upplied through conduit 90 to cool the int~rior c:h~mber 20 and ¦ pr~vent ov~rh~ating o~ ths Motor 76.
During tho r~lining operatic~n the ~peed of rotation ofthe spr~y no2zles 70 ~ay ~ v~ried, a~ well as ~h~# ~low rate of ¦water to the wator r~ng~ 62 and th~ pre~sur~ of th~ alr stre~m pas~ing through th~ conduit 28. For r~llnlng th~ compl~t~
intarior surface of th- rGfractory body rot~tion of the nozzl~s 70 ¦serves to uniformly apply tho rofractory product to the urfa~e b~ing recond~tionod 80 th~t a r~fractory coatlng of a pre~lect~d thlcknes~ 1~ appl~d thereto w~thout applylng an ~xce~sive amount of thQ refrac ory prnduct~ A~ noted above th~ ~p~ed of rot~tlon of tha n~ 70 ~md th- raeo r~e ~blch eh- dry r-~ractorr ~u~e-rla¦
1i ~!
!1 - 31 -d~ ~
~1313~33 and water are convey~d to th~ nozzle a3sembly 32 d~termine the ~
thickne~s of therefractory coating applied to the lnterior ~usf~ce ¦of the l~dle or ~urnac~. ~y the hot gunn~ng npplic~tion of the ¦refractory product, t~ r~fractory produc~ ~t~ up ~ore r~pidly ¦~nd 1eSQ produ~t 1- wa~ted. Purthermor-, wl~h hot gunning the ladl~ or furnace i~ re-tor~d to op~ration ln a ~hortor period of time because the l~dle or furnac~ 1~ not cooled prior to th~
gunnlng operatlon.
The gunning appar~tus 10 of th~ prs~ent lnvent~on i3 al~o readi$y adaptable to Jeloctive or loealized applic~tion of the refractory product onto the interior rurface of ~ ladla, bla~t furnace or the like. ~his i~ accomplish~d by init~ally lowering the hou~ing 12 to an axial po~ition within the ladle where th~
nozzles 70 are po~ltioned oppo~ite the portlon of th~ ladle in-terlor surface to be repaired. Where only a portion or quadrant of the interior ~urace~ ~s worn and mu~t be repair~d by building up the worn quadr~nt by applying the refractory product thereto, th~ ~pray o~ the re~ractory product ~ con~inad to tha qu~drant.
Thls 18 ~ccomplisl~ed by ro~ating the driv~ sh~ft 84 in ~ fir~t ~dlroctlon dnd ev-r~lng rotation o~ ~h~ft 8~ to a ~-con~ dlr-ctlon~
I - 32 - , 1~38Ei33 with tho rever~$ng operat$on co~ducted ~t ~ pr~elocted ~requen~y.
In ~hi~ manner th~ nozxl~ 70 1~ os~illated through ~n ~rc corres-pondlng to th~ worn quadrant rather than rDtatlng th~ nozzlo-through 360' and ap~ly~ng th~ rofr~ctory product to unwo~n port$on of th~ ~nterior ~urfsca Not only 13 tho ngl~ o~ th~ arc of spray variabl- but th~ rat~ of rotatlon 1~ va~iable. Thu~, tho ~mount o2 ~aterl~l ~ppll~d to a portion of ths lnt~rlor urfac# 1 controllable, ~nd ~ selec~-d portion o~ th~ ~nt~rior ur~e of a ladl~ or bla~t furnac~ ~ay b- r~lin~d without h~Ylng to compl~tely r~linc th~ entlr~ lnt rior ~ur2ace. Thls provld~ a substantlal ~aving~ in mat~rial ~nd tlm~ of oper~tlon, p~nmittlnq th~ r~stored re~r~ctory body to ba roturnod to oper~tion ~ ~oon a~ po~s$ble.
Accordlnq to the provls~on~ of the patent ~tatuteJ, I
h~v~ expl~ln~d th- prlnclplo, proferred con~tructlon ~n~ mode o~
operatlon o~ my inv~ntlon ~nd h~ve illustrated and d~crlbod ~hat I now con~lder to rspr~ent lt~ bast ~mbo~lm~nt. H~w~ver, lt ~hould bo und~r~tood that, ~lthin the ~COpG of th~ ~ppen~ed clai~J, the ln~entlon ~y bo pr~cticod oth~r~ls~ th~n ~ 8p~
fically $11u-trat-d ~nd deJ~rlb-d.
_ 3~ _ . ,, ~ .. .. ~
There is a need to provide a gunning apparatus for applying a refractory product in situ upon the interior surface of a refractory body heated to an elevated temperature where the refractory product may be efficiently applied to a limited area of the interior surface as well as the the entire area of the inte-rior surface.
SUMMARY OF THE INVENTION
In accordance with the present invention there is provided a gunning apparatus for spraying a refractory product in situ upon the interior surface of a refractory body that includes a housing having an interior chamber with an inlet and outlet thereto. A feed conduit extends through the inlet for conveying a stream of dry refractory material. A nozzle assembly is rotatably supported in the housing outlet. The nozzle assembly has an inlet positioned within the housing and an outlet extending from the housing. A supply conduit conveys a wetting agent to the nozzle assembly for mixture wîth the stream of dry refractory material to -" ~138633 form a spray of refractory product from the outlet of the nozzle assembly. The nozzle assembly has a mixing chamber portion for receiving the wetting agent and air entrained dry refractory material to orm the refractory product. The mixing chamber is positioned adjacent to the nozzle assembly outlet. A swivel assembly connects the supply conduit to the nozzle assembly to permit rotation of the nozzle assembly relative to the supply conduit as the wetting agent is conveyed through the supply conduit and the swivel assembly to the nozzle assembly. Conduit means connects the swivel assembly to the mixing chamber to convey the wetting agent from the swivel assembly through the conduit means to the mixing chamber for mixture with the dry refractory material. The conduit means is connected to the swivel means to permit rotation of the conduit means relative to the swivel means. A drive mechanism is supported within the housing and is connected to the nozzle assembly for rotating the nozzle assembly at a preselected speed in a preselected direction to apply the refractory product onto a preselected area of the interior surface of the refractory body.
The housing is suspended from a crane and is positioned axially within the refractory body, such as a ladle or blast furnace, having an interior refractory surface to be recon-ditioned by applying the refractory product to the deteriorated portions of the interior surface. The supply of dry refractory material and wetting agenet, such as water, to the nozzle assem-bly is remotely controlled, as well as the rotation of the nozzle ~ 1~3~}633 A~ embly . me dry r~ractory ~terl~ conveyed from ~ ourc~
by a stream of air t~at i~ oonducted through the feed conduit at a preselectOEd volu~ ~low r~ts Rnd ~t ~ pr~elected pres~ure. In this manner the dry r~fr~ctory met~rlal 1~ ~onv~ye~ ~n ~ stre~
to th~ nozzle a~s~bly. The w~tting agent i~ conduct~d through the supply conduit ~h~ch 1~ conn~cted ~t th~ outlet end portlon thereof to th~ ~wivel a-Jembly.
On~ embod$~ent o~ th~ swlvel a~sembly include~ ~ fixed or ~tatlonary tubular po~t~on which i~ ~ecured to ~nd extends downw~rdly ~rom th~ outl~t of the hou~ing in suxrounding r~lation with t~e nozzle a~mbly. Th~ nogzle assembly 1~ ro~atable r~la-tiYa to t~e tubul~r portion which i8 nonrotatable. The tubul~r port$o~ has ~n openlng connected to the outlet end portion of the water supply conduit. The water supply ~onduit passe~ through the int~rior of t:he hou~ln~ and exit3 therefrom adjacent the outlet o~
the housing. A rotatable portion of the swivel hssembly i8 nonrotatably conn~ct~d at a low~r end ln surroundlng relation w~th the nozzle a~sembly below the tubu~ar por~on. The rotatabl~
or~ion h~s an uppar end rot~t~bly poYltlon~d on tha tubular por-:
t1on and ~ncludes a ~luid chamb~r commun~cating with ~ho op~ning n th~ tubular port~on. A pa~r of condu~ts ~cured to th~ rot~t-bl~ portion oonvey~ t~ wet~ing agent, which pas~e~ ~roM th~
ubular portion opening to tho fluid ch~mber, from th~ 8WiVRl 3 88embly to a p~ir of Jpray noszles o~ the nozzle ~s~embly for ixture wlth th~ dry xefr~otory material.
' , Prefexably, the nozælo assembly lnclud~s ~ palr of op~o-sitely poslt~onod ~p~ay nozzl~ that are e~ch thre~dedly eng~ged to ~ water r~ng. Tha wat~r ring i8, in turn, threadedly engag~d to a cap portion ~t th~ b~s~ o~ the noz21~ a~sombly. ~he cap por-tion lncludes lntorn~l pa~ageway~ th~t convey th~ ~ry refractory material to the re~psctiv~ water rings. The wet~ing ~gent 1~
conveyed to the wator ringa from Ywivel a~embly by the pair of condults. Thc wetting agen~ and dry r~fr~ctory materlal are mixed in the w~ter rinq~ to form th~ refractory product. The ~pr~y ¦ nozzle~ are positloned opposlte one ~nother to direct ~ spr~y of the refractory product outwardly from tho c~nter ~xl~ of ~he refr~ory body onto tho interio~ 3ur~ce ther~o~.
The driYe mechani~m includes a reversible, vari~ble speed air ~otor t~at i8 ~upported within the housing and ~nclude~
a drive sha~t that i8 dr~vingly connected by a belt through a drive pulley and a dxiven pulley to the co~dult o~ the nozzle a~sembly insid~ the hou~lng. The rate of rotat~on of the no~zle l assembly i~ v~rlablo and i8 selectively controlled. The direction ¦of rot-tion, 1 e. clock-tlD- or oontercloc1cwl~o, ~ well ~ th-l . .
I .' . .
~ -10-~ ~;; ~ ~ e 1 1131~633 rate of rotation, i~ remotely controlled 80 that the nozzle .
assembly may be rot~ted in a preselected direction ~t e r2te of rotation between about 1/2 to 30 revolution~ per m~nute.
Once the nozzl~ ~ss~mbly is axi-lly po~itioned within the ladle or furnac~ to locate the outle~s of th~ spray nozzle~
oppositely of th~ polnt of application, the noz~l~ a~ombly may be rotat~d ln ~ ~elected dlrection to provlde a clrcular spray and uniformly coat th~ entir~ interior aur~ace. On th~ other hand, the dire~tlon of rotation of the no~zl~ a-sembly may be rever3ed to o~eillate the spray nozzles b~c~ and forth through an arc of a preselect~d ~ngl~ to apply the ~pray to a pre~elected area or quadrant of the inter~or surface. W~th thi~ arr~ngement the rotational speed ~nd r~ta of revers$ng the directlon of ro~ation i~ variable. This operation i8 par~icularly deslr~ble when only a portlon of the lnterior surface requires repair by relining.
ll;~Y633 ~? ~
The refractory product i5 applled to the inter~or surface of the refractory body at th~ elevated operAting temper-~ture o~ the body. ~y conductlng the gunning operat~on ~t an el~vated temp~rature, it 18 not n~c~s-ary to cool th~ refractory body before th~ gunn~ng oper~tlon i9 carrled out. To protect the driv~ mechanl~ ~ro~ th~ d~leterlou~ af~ct~ o~ the high te~perature withln th~ ladle or furn~c~ th~ int~rlor surfac~ o~
the hous~ng i~ lln~d ~ith 2 Ju~table in-ulat~on mater~al. In addition, th~ motor 1~ ~alntalned at an ~fflcl~nt operating temperature by conduotlng air ~nto thÆ hou-lng fro~ ~n a~r 3upply conduit. A v~ntilation port i~ proviaod ln th~ houslng 80 th~t the air circul~tcs throughout the lnterlor chamb~r of the hous~ng and around the motor to mainta$n the motor at a presel~cted operating ternperature.
A~cordlngly, the princlpal ob~ect o~ the pre~ent ¦ inventio~ is to prov~de a gunning apparatus for ~praying a refractory product ln situ upon the lnt~r~ox ~uxface of a refractory body by a nozzl~ a~sembly that i3 posltloned within the body and rotat~d at a pre~elected ~pe2d in n pre~elected directlon to apply tha re~ractory product up~n a ~lected port~on of tb~ int~rior surao~.
. . l c ~ ~
~ 3~1Ei 33 Anothor o~ct of t~.precent ~nventlon ~ to pro~ide a gunning apparatu- that penmit~ the remote appllcation of a ¦refractory product upon tb~ ~nterio~ ~urfac~ of a r~frac~ory body ~uch as a ladl-, blast furnac~ and th~-liko by rotat$ng a nozzle a~sembly ~t ~ pr~select~d rate ln a pre~elQcted dlr~c-tion to apply th~ r~fractory product upon th~ interior ~urfac~
of the body and th~r~by rep~lr the intorlor Eurfac~ m~int~$ned at ths elevated op~rat$ng t-~p~rature of the refractory body.
¦ A further ob~ect of the pre~ent inY~ne$on 18 to Iprovlde ~ gunnlng appar~tu~ that include~ a ~wlvel as~em~ly for con~e~tlng the wat r upply condu~t to the nozzle ~8~embly to per~it rotation of the no~ assembly relat~ve to th~ water 8uppl~
conduit as water o~ any oth~r ~uitable wettlng ~gent i8 conveyed to the nozzle as~Qm~ly.
~ he~e and other o~ects of the present ~nventlon w$11 be more complet~ly aisclo~ed and de~cr$bed ln the follow~ng ~pecification, the ~ccompanying dxawing~ ~nd the ~ppended claim~.
~ , . _ _.---' t~' 1~3~633 BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a view in side elevation and partially in section of a gunning apparatus for applying in situ a refractory product to the interior surface of a refractory body illustrating one embodi-ment of a swivel device for connecting the water supply conduit to the nozzle assembly.
Figure 2 is a view similar to Figure 1, illustrating another embodiment of the swivel device.
Figure 3 is an enlarged fragmentary view in section of the swivel device shown in Figure 2.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to the Figure 1 there is illustrated a gunning apparatus generally designated by the numeral 10 for applying in situ a refractory product to the interior surface of a refractory body, such as a metallurgical ladle used in the carrying, holding and pouring of molten metal, high temperature furnaces, such as oxygen vessels, open hearth furnaces, blast furnaces and other refractory installations, such as soaking pits and cupolas, to recoat or reline the deteriorated interior surface of the refractory body.
The gunning apparatus 10 includes an elongated ~, ~ 113~633 hou~ing 12 having v~rtical cyllndrical slde walls l~ with a cover plate 16 and a conical bas~ 18 secured to oppo~ite end~ of the slde wall~ to ther~by fonm an inter~or ch~mber 20. A pa$r of eyel~t~ 22 are ~ocured to and extend upwardly fro~ the cover plat~
16. Th~ gunning appar~tu~ lO i~ su~pended above th~ refractory body by hooks ~ngaging the eyalets 22 and lowered by a cable fed from an ov~rhcad cr~no. Sn thlB manner, the housing 12 ~ ax~ally lowered into tho refractory body for movement through the intor~or : ¦thoreo~ as the refractory product i- ~pr~yed onto tho cntl~
¦interior surfac~ or onto ~ ~slect~d ~rea theroof ln ~ccordance ¦with ths pr~s~nt in~ntlon.
I ~h~ gunning appara~u~ lO $8 low~rsd into th~ opon ~nd ¦yortion of th~ hot ladl- or b~ast furnac~ ~nd is op~r~ted from a : I control panel po~lt~on~d remote of tho gunnlng location. The cover plate 16 lnclud~- ~n inlet 24 through ~hich a mat~rlal feed .
conduit 26 extends. Th~ upper ~nd portion o~ condult 26 pro~ects ~rom th~ houslng ch~b~r 20 and i8 connect~d to an ~long~ted flexlblo conduit 28 whioh communlcates ~t lt~ oppo~lte end (not I shown) with a pre~aur~ ch~mb~r containing dry granular refractory ZO ¦¦ls~terlAl. ~i undsr Pre--ur- l~ conducecd ~ro~ ~ co~pr~ssor lnto ¦
l . l '. ' 113E~633 the ch~mbor and ln g w~ nv~n manner th~ dry r~fractory mater~al i8 ~ntralned ln the ~lr ~trea~ ~nd conv~y~d from tho ch~mber through conduit 28. Tho gunnlng operator control- the fe~d of thc r~frA~tory ~t~r~al entrain~d ln ~lr through ~he eondul~ 28.
From the conduit 28 the rsfr-ctory mat~rial passe~ to the feed condu$t 26 w~ich ~ connected by a rotary coupllng 30 to a nozzlo a~embly g~nerally deslgnat~d by the numeral 32.
The nozzl~ ao2~mb1y 32 i8 rotatably ~upport~d with~n an ou~let 3~ o~ hou~ing 12 by a sleev~ bearing 36. ~he nozzl~
asse~bly 32 ~nclude- on~ or ~ore outlets 38 from which n r~frac- .
tory product i~ sprAy~d onto thei*terior ~urfac~ of th~ ladle or furnace. Th~ refr~ctory product i8 fonm~d by the addition of a wetting agent, such as wat~r, to the str~ of dry refr~ctory material in th~ noz~lo a-sembly 32. W~t~r i~ suppliRd to the nozzl~ as~mbly 32 through a wator ~upply conduit 40 h~ving a su~table length to ~xeend fro~ a ~ourc~O The operator of th~
gunnlng apparatus 10 oontrol~ tho flow o~ w~ter through conduit ~0 by a valve at the control p~nel ~not shown). ~h~ w~ter supply conduit 40 h~ an and portion 42 that 1~ connected by ~ swlvel echani~m 4~ to tha nozzle a~aembly 32. Th~0 per~lt~ tho nozzle ¦assembly 32 to rotate relatlv~ to the wat~r ~upply conduit 40.
~ I
113E~633 Th~ noz~le aasembly 32 include~ a condult 46 that 1~ .
conneeted to tho rot~ry coupllng 30 to p~r~it rot~tlon of the co~-duit 46 withi~ th~ housing 12. Tho rotary ~oupllng 30 $ncludes ~ealed pa~ageway for the ~low o~ r~ractory mat~ri~l from the feed conduit 26 to tho conduit 46. Wlth this arr~ngement th~ con-duit 46 i~ rotatabl~ w~th~n t~e hous$ng 12 a8 th~ feed condu t 26 remain~ station~ry within the houslng 12. ~he outlot 34 o~ the housing 12 is ~xially al$gn~d with the inle~ 24. The con$c~1 ba~e . 18 o~ the hou~ing 12 convergos ~nwardly from th~ cylindrical si~e-wall~ 14 to an opening 48. A flanged ~ ve member 50, welded to the conical ba~e 18, i~ poJition~d wlthin th~ op~ning 48. Th~
~lanqed ~leeve m~mba~ 50 ~- axl~lly ~upport~d withln the openi~g ~8 and includes a pa~figeway 52 to form th~ outlet 34 of the hou~-ing 12. The sleeve bearing 36 ~ supportod by tho sle~ve m~mber 50 and ~nclude~ a bor~ 54 through which ~h~ conduit 46 of the noæzle a~sembly 32 ext~nd~. The sl~ev~ bearlng 36 rota Wbly 8Up-rt- the ~ondult J6 ~lthin thu houuing outlet 3~.
~i . l - 17 _ . ~
1~ ~ ~
Th :r~ r nd portlon o~ eh~ condult ~6 1- threadedly- ¦
connect~d to ~ cap 56. The cap 56 includo~ an lnlet 58 surroundln~
tha ~nd of condult 45 ~nd a pair of outlets 60 that are angularly displaced relatlv~ to the lni~t 58. ~h~ cap 56 includes Rn lntcr-nal pas~ageway that connect3 the lnlet 58 with ~he outlet~ 60.
With ~his ~rrangemont the alr en~ralned, dry refractory materlal flow~ from ths fe~d conduit 26 lnto the nozzle condult 46 and therefrom to the cap 56. ~h~ dry refrActory ma~rial i8 dlrected through the internal passageway o~ the cap 56 to th~ re~pective ¦outlets 60. The outl~t~ 60 ~re ~ubstantlally at r$ght angles to the inlet 58.
A water ring 62 i8 thread~dly ~cur~d to ~ach o ~h~
outlets C0 of th~ cap S6. Each water rlng 62 lnclude~ an.inlet port 64 that communicatos wlth circumforontl~l p~-sagewAy surround~ng an axlal pa~-~gew~y. A plurallty of rHdially po81-tioned apertur~ conn~ct ~ho circumfer~nti~l p~ag~ay wlththe ~xial passageway. Th~ lnlet port~ 64 ~r~ connoct~ by a toe conduit 66 to tho ~wlv~l mechanl~m 44. Th~ ~w$v~ chsni~ ~4 ~8 colmected to a branch condu~t 68 of t~o t~ condult 66 to p~mit ~0 the te~ condu~ to ro~ r~l~tlve to tho wivol m~ch~ nd the wat~r supply conduit 40.
-18- _ 1~3~6;~
The wetting agent, preferably water, is supplied by conduit 40 to the water rings 62 and through the internal apertures thereof into mixture with the air entrained stream of dry re~ractory material. In this manner the water rings 62 serve as mixing chambers for the water and refractory material to produce a refractory product in slurry form. A spray nozzle 70 is threadedly engaged to each water ring 62 and includes the outlet 38 of the nozzle assembly 32. The refractory product passes through the nozzles 70 and is emitted in a spray from the outlets 38. Preferably, as illustrated in Figure 1, the nozzle assembly 32 includes a pair of spray nozzles 70 that are oppositely positioned and supported by the water rings 62 to project downwardly at an anyle to facilitate spraying the base and lower portion of a ladle.
Also, this arrangement cancels any resultant thrust applied to the nozzle assembly 32 that would tend to displace it from an axial position within the housing outlet 34~
The nozzle assembly 32 is rotatably supported within the outlet 34 of housing 12 for rotation of the spray nozzles 70 in a preselected direction at a pre-selected speed to uniformly apply a layer of the refrac-tory product of a preselected thickness upon the interior surface of the refractory body. A pulley 72 is nonrotat-ably secured to the end of the inlet conduit 46 adjacent 113~6;~3 the rotary coupling 30. The pulley 72 is drivingly connected to a drive mechanism generally designated by the numeral 74 to rotate the inlet conduit 46 and the entire nozzle assembly 32 at a preselected speed and in a preselected rotary direction.
The drive mechanism 74 preferably includes a reversible air motor 76 that is suitably supported within the housing 12 and receives air flow through a conduit 78 that passes through an opening 80 in the housing cover plate 16. The conduit 78 is connected at the opposite end to a remote air source and the controls for the motor 76 are also provided at the remotely positioned control panel. The motor 76 includes a housing 82 which is suitably supported in the housing 12. The air motor 76 rotates a drive shaft 84 at a variable preselected speed in a preselected direction. Also, the frequency of reversing the direction of rotation of the drive shaft 84 is variable. A pulley 86 is secured for rotation with the drive shaft 84 and rotation of the pulley 86 is transmit-ted by a drive belt 88 to the pulley 72. The drive belt 88 extends around the pullevs 72 and 86 to transmit rotation of the motor 76 to the nozzle assembly 32. It will be apparent that an electrically operated motor may be used in place of the air motor 76 of the present nvention.
113~3633 Now ref~rrlng to Figur~ 2 and 3 where li~ numerals .
raised by 100 refer to llke p~rts illustrated in Flgure 1, ~here 1~ lllu~trAted a ~cond ~mbodi~ont of the ~wlvel ~eehnni~m generally d~ignated by th~ numeral 144. ~h~ ~wi~el mechanism 144 connects the water supply conduit 1~0 to the nc~zle a88embly 132 in a ~anne~ to permit rotatlon of the nozzl~ as~mbly 132 relative to the condult 14G a- water, the wettlng agent, ~8 conveyed to the no~21e ~Ds~mbly 132. me water ~upply condu~t 140 extends through an opening 96 in the hou~lng cover plat~ 116 ~nd extend~ through the interior chamber 120 of the houslng 112 to an openins 98 i~ the conlcal base 118 of the houslng ad~acent the hou~ing outlet 134. The ~ondu~t 1~0 extend~ from th~ open~ng 98 and i~ connect~d at lts outlet end portlon 142 to the ~wivel a~embly 144.
Thn ~wlvel a-~mbly 144, a~ lllu~trat2d ~n greater detail in Figuro 3, lncludes ~ first ar fixod portion g~norally deJignated by tho num~r~l 111 ~hich is ecured to the hou-$ng 112 surrounding th~ outl~t 134 thoreof and a second or rotatablo portion generally de~ign~t~d by tho numeral 113. 5h~ rot~tabl~
portion 113 i~ rotatably conn~ct~d at ono ~nd to tha ~ixod port~on - 21 - .
c ~
l ~138633 111 and at an oppo~lto end i~ connected for rotation with th~
inle~ conduit 146 of th~ nozzl~ R~sombly 132. The ~ixed port~on 111 and th~ rotatabl~ portlon 113 haY~ co~municatlng lnter~l pa~sageway~ ~or con~ ylng the wottlng ag~nt ~ro~ th~ supply conduit 140 througb t~ ~x~d and rotat~ portlon- 111 And 113 to a p~r of condult~ 115. q~e condults 115 ~r~ ench connQcted at one end to outlat- of th~ rotatablo portlon 113 and at ~n oppo~$t~ end to th~ ports 164 communicating with the ~ixing chasn~er~ of ~he w~t~r ring~ 162. ~ccordlngly, wat~r i~ mixed wlth th~ dry re~ractory material in th~ mixlng chambers of th~
ater rings 162 to produce th~ refractory produ~t that i~ sprayed in a slurry for~ ~ro~ the nozzle~ 170, ~8 described herein~bove.
¦ Th~ fixQd portion 111 of the swivsl a~em~ly 144 include a plate member 117 that is positioned ~n ~butting relation w~th a ¦flange portion 119 of the ~ ve member 150 that i8 ~ecur~ly positioned in the hou~ing opening 148. The plat~ ~e~ber 117 and the fl~nge portion 119 includo align~d, thr~aded bore4 through whi~h bolts 121 ~ro threadodly advanc~d ts con~ect th~ plat~
m~mber 117 to the flang~ portion 119. ~ho plat~ 117, ~ lllu8-' ¦ tr~ted in Figuro 3~ includ~o an upp~r annular portlon 123 h~vinq l - 22 -, . . . . .. ..... . .
113!3633 an annular recess 125 ~nd a low~r annul~r portion 127 having a -bore 129 ~herethrough. mO lower end portion o~ th~ 6~eev~ 136 ext~n~s throug~ tho bore 12g. Conv~ntlonal lubr~c-nt ~al~ 133 Ar~ posltionod ln thR r c~-~ 12S b~two~n tho 81~ 136 an~ ~ho upper annular portlo~ 123 to prov~d~ ~ lu~ricant s~al betwæan tha plat~ memb~r 117 and th~ Y~ 136. A~ d~-cribe~ above, the inlet conduit 146, t~at conveys the dry re~recto~y ~aterl~l to the water ring~ 162, ~xt~nds throu~h the ~1~QVe 136. Prefcrably, an annular groove 1~ ~ormed on th~ out~r cylindric~l ~urface of tho ~nl~ con~u$t 146 oppo~ite the leeve 136, and a convention~l o-r~ng ~e21 135 1~ poaltioned in the annul~r groove to provid~
~e~l between th~ ~le~v~ 136 and the inlet conduit 146.
The flx-d or ~tatlonary portion 111 o~ the ~wivel ~ssembly 144 ~lio l~clud~s a tubular extension 137 that is secured ~t upper end portion 139 to tho lower ~nnular portion 127 of the plat~ member 117 in a ~uitabl~ mann~r, ~uch n~ by w~ld$ng a~
indic~ted in Figur- 3. ~h~ tubular ~emb~r 137 ha- nn axlal bore 141 therathrough, and t~e upper portio~ of th~ b~re 1~1 i8 positioned in surrounding rolation with tho low~r ond of th~ ev~
116. ~8 lllu~ rat-~ ln Flqur 3, th~ ln-lde dl _ t~ of th-Il I .
I' , ~ - 23 - ' ~ ~
. I ~ ~
1 ~3~3~33 tubular member 137 1J great¢r than the outer dlam~ter of the sleeve 116. Th~ tubular ~e~ber 137 includo~ an opQnlng 143 extending through th~ wall of th~ member 137 ana l~to the bor~
141. Th~ tubular mRmbar 137 1~ al~o concentrically po3itloned with re~poct to th2 ~nlet condu~ 146. With thls arrangement, an annulus 145 is ~ormed botween th~ inn0r cyllndrical surface of the tubular member 137 and the outer cylindric~l surfa~e of the inlet conduit 146. The ennulu~ 145 com~unicate~ with th~
opening 143 ln tho tubular member 137. Tho end portion 142 of the wat~r supply condult 140 i~ conn~cted to the flx8d portion 111 of the 8wivel aJsembly 1~4 and preferably i~ conne~ted to the tubular memb~r 137 in th~ opening 143 ~o that wat~r i8 con~
veyed from th~ conduit 140 through the openlng 143 and lnto the annulu~ 145.
The rotat~ble portlon 113 of thc swivel assembly 144 $s rotatably po~ieloned on the tubular member 137 of the fixed portion 111. Thu-, the tubular member 137 19 ~t~t$onarily po~ltioned relatlv0 to th~ noz~le a~embly 132. Th~ ro~tablc ort~on 113 ~n~lud~- a flrst ~amber 147 ~nd a s~ond me~ber 149 t~at ~ removably conn~ted to the flr~t m~mb~r 14? by bolt~ lSl engag1ng allgn~d thr~4d~d boro~ 153 ~nd 155 of th~ flr~t and second meMbers 1~7 ~nd 149 r~p~ctl~cly.
2~ - . .
. i, 11 ~
1 ~138633 The f~rst ~omber 147 of the rotatabl~ portion 113 inelude~ an upp~r cylindrlcal portion 157 and ~ low~r flango portlon lS9 ~xt~n~in~ r~d~lly outw~rdly fro~ th~ cyllndrlcal portion 157~ ~h~ cyllndrleal portion 157 has an lnwardly pro~cting ~nnul~r houldor 161 having ~ bor~ 163 therethrough.
A lowor ~nd portlon 165 o~ th~ tubular m~mb~r 137 oxte~ds through tho ~orc 163 $n ~buttlnq rolation with ths annular ~houlder 161 and oxtend~ downwardly ther~from. With thi- ~rrange~ent, an annulus 167 i~ for~d abov~ the annul~r hould~r 161 betwe~n thQ
tubular ~ember 137 ~nd th~ cylindrlcal portlon 157, and an annulus 169 is for~od b~low the Annular ~hould0r 161 betwean the tubul~r me~er 137 and the ~ylindric~l portlon 157.
A bea~lng d~vlco, ~u~h a~ a bronz~ bu~hing 171, i8 pres~ fitted into ~ngag~ment wlth tho cyllndric~l portlon 157 in tho annulu~ 167 and 1- ~rrang~d for rotation wlth the first ~e~ber 147 of rot~ Wble portlon 113 rælative to th~ tubular m~mber 137.
conven~lonal lubr~cunt fittlng 173 ext~nds through th~
cyl~ndr~cal portiQn 157 and tbo bushing 171 l~to communlcation ~lt~
the spac~ betweon t~ lnnor cylindrical ~urf~ce of th~ bu~hlng 171 and the ad~cent outer cylindric~l surface o~ th~ tubular ~ mb~r 37. With thi~ ~rr~g~mont, ~ ~uitabl~ lubric~nt i8 4upplied ~0 thls ~pac~ to fac$11tat~ rot~tion of th~ rotatabl~ portion 113 relatlv~ ~o the flxe~ portion 111 of th~ le~v~ ~se~bly 144.
l - - ~
l 1~38633 To prov~de a ~u~tabl~ ~eal b~tween the ~nnular should~r 161 and the low~r ~r~d portlon 165 of tu3:~ular me~ber 137 ~uitable 0-ring typ~ ~eals 175, uch as co~nerc~a~ ~vail~ Viton 8~al~, ~r~ positionod in ~ ~nnulu~ 169 b~low the annul~r ~hould~r 161.
~rhe seal arr~ng~mont preY~ntJ ~low sf water ~rom the annulu~ 145 up through the cylind~c~l portlon 157 botff~n th~ cyl~ndr~cal portlorl 157 and th- tubul-r m~ber 137.
Th~ flr~t and ~cond memb~rs 1~7 and 149 o~ thc rotatabl~ portio~ 113 a~ connected to ~on~ ~n ~t torior fluid cha~ber 1~7. Th~ flui!d chamb~r 177 com~un~cat~s wlth ~h-annulu~ 145 which ~erv~ a- a ~luid ch~er for tll~ ~low of _ ~ttirlg agent thor~to fro~ the outlet 142 of th~ supply conduit 140. lq~e second m~m ~ r 149 inc:ludes a circular plat~ 179 ~nd a lower tubula~ poxt~on 1~1. Th~ tubular portlon 181 extends downwardly ~r.om and 1~ axially allgned ~th the clrcular plato 179. A bore 183 ext~nd~ ~xlal~y through t~e pl~t~ 179 ~nd tubul~r portion 181. ~he ~nl~t condult 146 ~xt~nd~ through the bore 183.
Set scrows 185 xt~nd through th~ ~ubular portlon 181 and lnto the wall of th~ lnl~t conduit 146 to nonrotatably ~onn~t thR
tu~ular por~on 181 to th~ inlot conduit 1~6. ~n t~l~ manner ~he ro~atable port~on 113 1- conn-cted to tho inl~t condu~t 146 80 that th~ rotatabl~ port~on 113 rotate~ w~th the lnlet condu$t 1 ¦b~ op~r~t~on o~ th- drlv~ mechani~ 17~ a~ ~bove al~cu~ed.
~ ~ 2~ -she plae~ 179 inclu~e~ nnul~r ~houlder 187 ext-nd~ng~
into tho ~luid ch~mber 177. Thc annular ~houlder 187 fonms a r~ce~s portion 189 wi~h th~ upper surfac~ of plata 179, and ~ui Wblo O-ring typo sR~lJ 191, such a~ ~o~m~rci~lly availDbl~
Molythan~ Polypa~ 18, ~no po-ition~d 1~ th~ ro~e~ 189. ~h~
~e~ls 191 in ~ho rccs~ 189 ~alingly eng~g~ thQ outer cyllndri~l surf~ce of th~ ~nl-t ~onduit 146 opposi~e th~ annu~ar should~r 187 to prevent wat~r and/or r~fractory matarl~l fro~ p~slng b~tw~en the inlet ~ondult 146 and th~ tubu~r portlon 181.
Th~ pl~t- 179 ln~lua~ a p~lr of openings 193 ~xt~nd~ng th~rethrough and a~apt~d to rec~ive thA uppor ond~ of the pal~
of conduits llS, re~p~c~lvely. The opposite end~ o~ th~ conduit~
115 ~re connect~d to t~ ports 164 th~t op~n lnto tho mixlng chambers of t:h~ wat~r ring~ 162 to conv~y the wetting agent from ¦the fluid ch~mb~r 177 through the openings 193 and conduits 115 Ito tho rlng~ 162. ThuJ, w~th the above deacribed 4rrang~mænt tho ¦wet~ng ~gent i8 ~on~oyed by th~ ~upply conduit 1~ ~hrouqh the ¦opening 1~3 into ths ~luid ch~ber or ~nnulu~ 145 o~,~hQ ~wivRl l a~embly fixed por~io~ 111 and i~ con~y-~ ~rom tho ~nnulu~ 14S
Ito ch~b~r 177 an~ th~ op~nln~ 193 into th~ con~ult~ 115. Sb~
~onduit~ 115 ~onv~y tho wettlng ~gent ~o th~ ~ixln~ ~ha~b~r~ o~
! th~ ring~ 162 whers th~ ~ottlAg a~ent i~ mlxed wi~h t~ dry a~ ~
~3~3633 refractory ma~erial convey~d from the $nl~t conduit 1~6. The wet~ng agent and dry refr~ctc~ry materlal ar~ mix~d to fo~o a r~fraceory pro~lu~t ln slur~y form that i~ ~praycd from tho nozzles 170. 'rhu~, ~it:h t~ bov~ des~rib~d arrang~nt the ~upply condu~t 14a 1~ CoJ~CtQI~i ltO ~h~ noz21~ ax-ombly 132 by th~ ~wiv~l as~mbly 144 in a m~aner to pormit the no~zlo a~embly 132 to rot~te relat$v~ to th~ ~upply condu$t 140 ~ th~ t~ir g aslent 1~ convey~d to th- no~21e ~s-~bly 132.
¦ The r~linlng op~r~t$on carriQd out by thH guhn~ng ¦ apparatu~ 10 $11u~trat~d ~n Flgure~ 1-3 ~a con~uct~d $n ~$tu at ¦th~ elevated t~mper~tur~ o~ th~ re~ractory body a- oppos~d to tho ¦convent~on~l praot~co o~ removing tho r~f~ctory b~dy, ~uch as a ladle or furnac~, fro~ opera~ion ~nd cooling lt. Th~ ~oll~w~ng des~r~ption o~ the me~hoa of op-ration ~ the present $nvention r~fer~ to the embod~ment ~llu~trated in Figuro 13 however, it should b~ und~r~tood that th~ d~scr~bed ~thod of op~ration al~o applie~ to tho embodi~nt illustrated ln Figure- 2 a~d 3. Th w , referene~ i8 ~ade to tho ~bo~iment of Flgurn 1 only fo~ conv~nlen~ 8 ~nd brevity. Tho hou-~ng 12 i~ ~usp~ndQd by a cranQ and lo~srod, for exa~pl~, ~nto ~ l~dla ~hi~h 1~ malnt~ln~d a~ lt~ operstin~
~- 28 ~13~3~33 temperature which may be in excess of 900 F. Because the housing 12 is subjected to excessive heat the interior components and particularly the drive mechanism 74 are protected by insulating the walls of the interior chamber 20 with a suitable insulation material 89.
Further, in order to protect the motor 76 from the deleterious effects of the surrounding heat, air is injected into the chamber 20 through an air supply conduit 90 that extends through an opening 92 in the cover plate 16. The end of the conduit 90 is retained within chamber 20 and the flow of air through the conduit into the chamber is controlled by the gunning operator. An oulet port 94 in the housing 12 promotes the circulation of air through the chamber 20 and around the motor 76. The air flow is also promoted by the cylindrical configuration of the housing 12. With this arrangement air is supplied to the housing chamber 20 to maintain the motor 76 at a temperature to ensure efficient operation. Figure 2 also illustrates a corresponding insulation material 189, air supply conduit 190, opening 192, and outlet port 194.
.~' _ 11;~633 ~ he operation3 of ~upply~ng th~ ~ttlng agont to the -nozzl~ n~sambly 32 through th~ ~upply conduit 40~ turnlng th~
~o~or 76 off and o~ to rotat~ the nozzlo a~mbly, ~nd controlllng th~ dir~tlon of ~t~tlon and ~p~d of ro~a~ion of ths no2zl~
as~mbly ~r~ controlled from a control panol which 1- pr~rably locat~d at a po-ition ~t~vat-d ~bov~ th~ r~r~ctory body belng rellned. Fro~ thl- locat~on th~ ope~tor 1- in a po~it~o~ to obuer~e the r¢llnlng op~r~tion. Th~ op~ration~ o~.~upply~ng alr ~or ~ooling th~ int~rlor of chamb~r 20 o~ ~h~ houslng 12 ~nd convcying the ~ry r-fractory material ~ntralned ln ~lr through the conduit 28 tc tho nos21~ a~ bly 32 ~r~ controlle~ ~y tho gun operator who ~8 al~o po~itlon~d rom~t~ of th~ refractory body.
In$ti~11y, tb~ gunnlng apparatus 10 ie axlally po-~-tioned within the interior o~ the re~ractory body by lowerlng the housing 12 supportod by a crane at the lifting eyelot6 22 lnto the body. The gunning oper~tion may include a tot~l recondition$ny f the refr~ctory body by 2pplying th~ rafractory product to the ntir~ ~nterior surfoc~. ~or thiJ oper~tion th~ hou~ing 12 i~
ither lowered ~t a controll~d rat~ ~nto th~ body a~ th0 refra~-ory produet i8 ~prayod onto tho lntorlor surf~co, o~ i~ th~
I alt~rn~tiv~ th~ hou-ing 12 ~y b~ po~lt~on~d ~t ~ha lowe ~t 11;~8633 position within th~ ~ody and then rai~ed vo~tically as the inte~
¦ rior ~urface i- ~prayed. Ho~v~r, for both metho~ once the hou~ing 1~ selectl~r~ly posltloned wlthin ~he r~Erac:tory body, th~
w~tting a~ent i~ ppllod to tb~ nozzl~ ~s~embly 32 through t.he ~upply co~duit 40 ~n~ th~ no~le a~sembly 1~ rotat~d ~It a pre-l~elected sp~ed ~ n a pre~elected dir~ction . The~ th~ gunning op~r-ator f~ t2~e air entrAined dry refractor~ m~t~ri~l through th~
conduit 28 So t~ noz21a a0-e2~ly 320 Also, at thi~ 'cime air 1-I ~upplied through conduit 90 to cool the int~rior c:h~mber 20 and ¦ pr~vent ov~rh~ating o~ ths Motor 76.
During tho r~lining operatic~n the ~peed of rotation ofthe spr~y no2zles 70 ~ay ~ v~ried, a~ well as ~h~# ~low rate of ¦water to the wator r~ng~ 62 and th~ pre~sur~ of th~ alr stre~m pas~ing through th~ conduit 28. For r~llnlng th~ compl~t~
intarior surface of th- rGfractory body rot~tion of the nozzl~s 70 ¦serves to uniformly apply tho rofractory product to the urfa~e b~ing recond~tionod 80 th~t a r~fractory coatlng of a pre~lect~d thlcknes~ 1~ appl~d thereto w~thout applylng an ~xce~sive amount of thQ refrac ory prnduct~ A~ noted above th~ ~p~ed of rot~tlon of tha n~ 70 ~md th- raeo r~e ~blch eh- dry r-~ractorr ~u~e-rla¦
1i ~!
!1 - 31 -d~ ~
~1313~33 and water are convey~d to th~ nozzle a3sembly 32 d~termine the ~
thickne~s of therefractory coating applied to the lnterior ~usf~ce ¦of the l~dle or ~urnac~. ~y the hot gunn~ng npplic~tion of the ¦refractory product, t~ r~fractory produc~ ~t~ up ~ore r~pidly ¦~nd 1eSQ produ~t 1- wa~ted. Purthermor-, wl~h hot gunning the ladl~ or furnace i~ re-tor~d to op~ration ln a ~hortor period of time because the l~dle or furnac~ 1~ not cooled prior to th~
gunnlng operatlon.
The gunning appar~tus 10 of th~ prs~ent lnvent~on i3 al~o readi$y adaptable to Jeloctive or loealized applic~tion of the refractory product onto the interior rurface of ~ ladla, bla~t furnace or the like. ~his i~ accomplish~d by init~ally lowering the hou~ing 12 to an axial po~ition within the ladle where th~
nozzles 70 are po~ltioned oppo~ite the portlon of th~ ladle in-terlor surface to be repaired. Where only a portion or quadrant of the interior ~urace~ ~s worn and mu~t be repair~d by building up the worn quadr~nt by applying the refractory product thereto, th~ ~pray o~ the re~ractory product ~ con~inad to tha qu~drant.
Thls 18 ~ccomplisl~ed by ro~ating the driv~ sh~ft 84 in ~ fir~t ~dlroctlon dnd ev-r~lng rotation o~ ~h~ft 8~ to a ~-con~ dlr-ctlon~
I - 32 - , 1~38Ei33 with tho rever~$ng operat$on co~ducted ~t ~ pr~elocted ~requen~y.
In ~hi~ manner th~ nozxl~ 70 1~ os~illated through ~n ~rc corres-pondlng to th~ worn quadrant rather than rDtatlng th~ nozzlo-through 360' and ap~ly~ng th~ rofr~ctory product to unwo~n port$on of th~ ~nterior ~urfsca Not only 13 tho ngl~ o~ th~ arc of spray variabl- but th~ rat~ of rotatlon 1~ va~iable. Thu~, tho ~mount o2 ~aterl~l ~ppll~d to a portion of ths lnt~rlor urfac# 1 controllable, ~nd ~ selec~-d portion o~ th~ ~nt~rior ur~e of a ladl~ or bla~t furnac~ ~ay b- r~lin~d without h~Ylng to compl~tely r~linc th~ entlr~ lnt rior ~ur2ace. Thls provld~ a substantlal ~aving~ in mat~rial ~nd tlm~ of oper~tlon, p~nmittlnq th~ r~stored re~r~ctory body to ba roturnod to oper~tion ~ ~oon a~ po~s$ble.
Accordlnq to the provls~on~ of the patent ~tatuteJ, I
h~v~ expl~ln~d th- prlnclplo, proferred con~tructlon ~n~ mode o~
operatlon o~ my inv~ntlon ~nd h~ve illustrated and d~crlbod ~hat I now con~lder to rspr~ent lt~ bast ~mbo~lm~nt. H~w~ver, lt ~hould bo und~r~tood that, ~lthin the ~COpG of th~ ~ppen~ed clai~J, the ln~entlon ~y bo pr~cticod oth~r~ls~ th~n ~ 8p~
fically $11u-trat-d ~nd deJ~rlb-d.
_ 3~ _ . ,, ~ .. .. ~
Claims (14)
1. Gunning apparatus for spraying a refractory product in situ upon the interior surface of a refractory body comprising, a housing having an interior chamber with an inlet and outlet thereto, a feed conduit extending through said inlet for conveying a stream of dry refractory material, a nozzle assembly rotatably supported in said housing outlet, said nozzle assembly having an inlet positioned within said housing and an outlet extending from said housing, a supply conduit for conveying a wetting agent to said nozzle assembly for mixture with the stream of dry refractory material to form a spray of refractory product from said nozzle assembly outlet, said nozzle assembly having a mixing chamber portion for receiving the wetting agent and air entrained dry refractory material to form the refractory product, said mixing chamber being positioned adjacent to said nozzle assembly outlet, swivel means for connecting said supply conduit to said nozzle assembly to permit rotation of said nozzle assembly relative to said supply conduit as the wetting agent is conveyed through said supply conduit and said swivel means to said nozzle assembly, conduit means for connecting said swivel means to said mixing chamber to convey the wetting agent from said swivel means through said conduit means to said mixing chamber for mixture with the dry refractory material, said conduit means being connected to said swivel means to permit rotation of said conduit means relative to said swivel means, and drive means supported within said housing and connected to said nozzle assembly for rotating said nozzle assembly at a preselected speed in a preselected rotary direction to apply the refractory product on to a preselected area of the interior surface of the refractory body.
2. Gunning apparatus for spraying a refractory product in situ upon the interior surface of a refractory body as set forth in claim 1 which includes, means for circulating air throughout said interior chamber to cool said drive means and maintain said drive means at an efficient operating temperature.
3. Gunning apparatus for spraying a refractory product in situ upon the interior surface of a refractory body as set forth in claim 2 which includes, a first opening in said housing for receiving an air supply conduit, said air supply conduit communi-cating with a source of air under pressure and having an outlet positioned within said interior chamber, a second opening in said housing for venting air from said interior chamber, and said housing having a cylindrical configuration such that the air conveyed under pressure into said interior chamber circulates throughout said interior chamber and is vented through said second opening to maintain said drive means at an efficient operating temperature.
4. Gunning apparatus for spraying a refractory product in situ upon the interior surface of a refractory body as set forth in claim 1 which includes, means for insulating said interior chamber, said means for insulating being secured to the interior surface of said housing so as to protect said drive means from elevated temperatures surrounding said housing.
5. Gunning apparatus for spraying a refractory product in situ upon the interior surface of a refractory body as set forth in claim 1 which includes, said nozzle assembly having a mixing chamber portion for receiving the wetting agent and air entrained ¦
dry refractory material to form the refractory product, said mixing chamber portion being positioned adjacent to said nozzle assembly outlet, said swivel means having a fixed portion and a rotatable portion, said rotatable portion being connected to said fixed portion for rotation relative to said fixed portion, said swivel means fixed portion being connected to said supply conduit to receive the flow of wetting agent therefrom, said swivel means rotatable portion being connected to said nozzle assembly for rotation therewith, conduit means connected at one end to said mixing chamber of said nozzle assembly and at in opposite end to said swivel means rotatable portion, said conduit means being operable to convey the wetting agent from said swivel means rotatable portion to said mixing chamber, and said fixed portion and said rotatable portion having communicating passageways for conveying the wetting agent from said supply conduit through said fixed and rotatable portions to said conduit means.
dry refractory material to form the refractory product, said mixing chamber portion being positioned adjacent to said nozzle assembly outlet, said swivel means having a fixed portion and a rotatable portion, said rotatable portion being connected to said fixed portion for rotation relative to said fixed portion, said swivel means fixed portion being connected to said supply conduit to receive the flow of wetting agent therefrom, said swivel means rotatable portion being connected to said nozzle assembly for rotation therewith, conduit means connected at one end to said mixing chamber of said nozzle assembly and at in opposite end to said swivel means rotatable portion, said conduit means being operable to convey the wetting agent from said swivel means rotatable portion to said mixing chamber, and said fixed portion and said rotatable portion having communicating passageways for conveying the wetting agent from said supply conduit through said fixed and rotatable portions to said conduit means.
6. Gunning apparatus for spraying a refractory product in situ upon the interior surface of a refractory body as set forth in claim 1 in which said drive means includes, a drive motor supported within said housing, means for supplying power to operate said drive motor, a drive shaft drivingly connected to said drive motor for rotating said drive shaft at a preselected speed and in a preselected direction, means for drivingly connecting said drive shaft to said nozzle assembly to transmit rotation therto at a preselected speed and in a preselected direction such that said outlet of said nozzle assembly is reciprocated through a preselected angle to direct the refractory spray from said nozzle assembly outlet upon a selected portion of the interior surface being coated.
7. Gunning apparatus for spraying a refractory product in situ upon the interior surface of a refractory body as set forth in claim 1 which includes, a bearing assembly supported in said housing outlet, said nozzle assembly inlet being rotatably supported by said bearing assembly within said housing outlet, and said drive means being driving connected to said nozzle assembly inlet for rotation thereof at a preselected speed in a preselected direction.
8. Gunning apparatus for spraying a refractory product in situ upon the interior surface of a refractory body as set forth in claim 1 in which said nozzle assembly includes, a nozzle conduit having an inlet portion and an outlet portion, said inlet portion being rotatably connected to said feed conduit to receive the dry refractory material therefrom, said nozzle conduit being drivingly connected to said drive means and rotatably supported within said housing outlet, a cap member having an inlet connected to said outlet portion of said nozzle conduit, said cap member having a pair of opposed outlets communicating with said cap member inlet and positioned at substantially right angles thereto, a ring member connected to each of said cap member outlets, said ring member having passage means for receiving the wetting agent and the dry refractory material to mix together the wetting agent and the dry refractory material to form the refractory product, conduit means for connecting said ring members to said swivel means, said swivel means being operable to rotatably support said conduit means, said supply conduit being connected to said swivel means, said swivel means being in fluid communication with said supply conduit and said conduit means to convey the wetting agent from said supply conduit to said conduit means, and a spray nozzle having one end portion connected to each of said ring members and an opposite end portion with a passageway extending therebetween for discharging the refractory product in a spray.
9. Gunning apparatus for spraying a refractory product in situ upon the interior surface of a refractory body as set forth in claim 1 which includes, said drive means being operable to oscillate said nozzle assembly at a variable speed through a preselected angle to spray the refractory product in an arc upon a limited portion of the interior surface of the refractory body.
10. Gunning apparatus for spraying a refractory product in situ upon the interior surface of a refractory body as set forth in claim 1 in which said swivel means includes, a fixed portion and a rotatable portion, said fixed portion being connected to said housing outlet, said rotation therewith, and connected to said nozzle assembly for rotation therewith, and bearing means for connecting said fixed portion to said rotatable portion to permit said rotatable portion to rotate relative to said fixed portion.
11. Gunning apparatus for spraying a refractory product in situ upon the interior surface of a refractory body as set forth in claim 10 which includes, said swivel means fixed portion having a fluid chamber and said swivel means rotatable portion having a fluid chamber, said fluid chambers of said fixed portion and said rotatable portion being arranged in fluid communication with each other, said supply conduit including an end portion connected to said fixed portion to convey the wetting agent into said fluid chamber thereof, and conduit means for connecting said rotatable portion fluid chamber with said nozzle assembly so that the wetting agent introducted into said fixed portion fluid chamber flows into said rotatable portion fluid chamber and therefrom through said conduit means to said nozzle assembly for mixture with the dry refractory material.
12. Gunning apparatus for spraying a refractory product in situ upon the interior surface of a refractory body as set forth in claim 10 in which, said swivel means fixed portion includes a tubular member positioned in surrounding relation with said nozzle assembly adjacent said housing outlet, said tubular member being stationarily positioned relative to said rotatable nozzle assembly, said swivel means rotatable portion including a cylindrical portion positioned in surrounding relation with said tubular member, and said bearing means being operable to rotatably support said cylindrical portion on said tubular member so that said rotatable portion is operable to rotate relative to said fixed portion.
13. Gunning apparatus for spraying a refractory product in situ upon the interior surface of a refractory body as set forth in claim 1 which includes, means secured to the top of said housing for supporting said housing at a preselected position within the interior of the refractory body such that said nozzle assembly outlet is positioned opposite a selected portion of the interior surface for coating with the refractory product.
14. Gunning apparatus for spraying a refractory product in situ upon the interior surface of a refractory body as set forth in claim 1 which includes, said supply conduit passing through said interior chamber of said housing, and said supply conduit extending from said housing adjacent to said housing outlet for connection with said swivel means.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US05/934,327 US4211367A (en) | 1977-03-23 | 1978-08-16 | Gunning apparatus for in situ spraying of refractory material |
| US934,327 | 1978-08-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1138633A true CA1138633A (en) | 1983-01-04 |
Family
ID=25465359
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000333874A Expired CA1138633A (en) | 1978-08-16 | 1979-08-16 | Gunning apparatus for in situ spraying of refractory material |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1138633A (en) |
-
1979
- 1979-08-16 CA CA000333874A patent/CA1138633A/en not_active Expired
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