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US3874644A - Rabble cleaning device - Google Patents

Rabble cleaning device Download PDF

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Publication number
US3874644A
US3874644A US448842A US44884274A US3874644A US 3874644 A US3874644 A US 3874644A US 448842 A US448842 A US 448842A US 44884274 A US44884274 A US 44884274A US 3874644 A US3874644 A US 3874644A
Authority
US
United States
Prior art keywords
rabble arm
cam
rabble
arm
blades
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 - Lifetime
Application number
US448842A
Other languages
English (en)
Inventor
Decreased George R Grimes
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cyprus Amax Minerals Co
Original Assignee
Amax Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Amax Inc filed Critical Amax Inc
Priority to US448842A priority Critical patent/US3874644A/en
Priority to CA212,280A priority patent/CA1019952A/en
Priority to GB4783074A priority patent/GB1441551A/en
Priority to SE7413909A priority patent/SE404547B/sv
Priority to DE19742453935 priority patent/DE2453935C3/de
Priority to FR7437860A priority patent/FR2263478B1/fr
Priority to AT923574A priority patent/AT339617B/de
Priority to IT9633/74A priority patent/IT1023798B/it
Priority to BE150677A priority patent/BE822386A/xx
Priority to LU71325A priority patent/LU71325A1/xx
Priority to NLAANVRAGE7415425,A priority patent/NL175339C/xx
Priority to JP14165174A priority patent/JPS5735390B2/ja
Application granted granted Critical
Publication of US3874644A publication Critical patent/US3874644A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/16—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a circular or arcuate path
    • F27B9/18—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a circular or arcuate path under the action of scrapers or pushers
    • F27B9/185—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a circular or arcuate path under the action of scrapers or pushers multiple hearth type furnaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/10—Maintenance of mixers
    • B01F35/145—Washing or cleaning mixers not provided for in other groups in this subclass; Inhibiting build-up of material on machine parts using other means

Definitions

  • the rabble arm cleaning device which is cooperably associated with said rabble arm comprises a hammer [52] US. Cl 266/20, 432/75, 432/139 assembly pivotally mounted on said rabble arm, the
  • PATENTED APR 1 9 5 saaznanks
  • PATEHTED 1 l975 sum u o 5 ATENTEQ APR 1 I95
  • SHEET 5 BF 5 RABBLE CLEANING DEVICE This invention relates to a rabble arm cleaning device for use in combination with rabble arms in roasting furnaces. such as the multiple hearth Herreshoff roaster.
  • the roasting of sulfide concentrates involves exothermic reaction which generates a great deal of heat.
  • it is continually rabbled using rabble arms which move in a circular path through the particulate charge, the rabble arms having spaced blades or rakes which work their way through the bed of the charge to assure continuous exposure of the charge to'the oxidizing atmosphere.
  • the sulfide charge converts to the oxide, there is a tendency for the product to adhere to the blades. The action is progressive and eventually closes the space between the blades to the degree that they no longer function adequately.
  • the rabbles are cleaned manually by an operator using a long bar to bump each blade as the rabble arms pass a door opening.
  • the rabbles are cleaned from one to several times each shift.
  • the continuous cycle of roasting varies from clean rabbles on the one hand to obstructed rabbles on the other, etc.. which can adversely affect the product between cleaning cycles.
  • Another object is to provide a rabble arm cleaning device in the form of an assembly coupled to a rabble arm, such that as the rabble arm continually moves through the bed ofthe charge. the assembly coacts with cam means in the hearth to effect cleaning of the rakes on the rabble arm.
  • FIG. 1 is a vertical section ofa typical multiple hearth furnace showing rabble arms in each of the hearths;
  • FIG. 2 is a partial section of several hearths showing the rabble arms more clearly;
  • FIG. 3 is a top view of FIG. 2 taken along line 3-3;
  • FIGS. 4, 5 and 6 are front elevation, plan and side elevational views. respectively, of a fragment of arabble arm showing a pivotally mounted hammer assembly for use in cleaning the rabble arm blades or rakes;
  • FIG. 7 is a perspective of a rabble arm fragment showing more clearly the hammer assembly mounted to the back thereof.
  • the invention is directed to the combination of a rabble arm and a rabble arm cleaning device comprising a rabble arm extending radially outward from a vertically disposed rotatable shaft for moving said rabble arm in a circular path about said shaft, the rabble arm having blades extending downwardly therefrom for contacting and raking particulate metalliferous material in a roasting hearth, and a rabble arm cleaning device cooperably associated with said rabble arm comprising a hammer assembly pivotally mounted to said rabble arm.
  • the hammer assembly has a weighted longitudinal member disposed below the pivot and extends longitudinally of said rabble arm in gravity contact with said blades and a cam-reacting member disposed above said pivot with a free end thereof extending above the rabble arm.
  • the cam-reacting member and the weighted member form a coacting couple about the pivot; that is to say, as the cam-reacting member is caused to pivot by contacting cam means in the hearth, the weight member is lifted away from the blades in an arcuate path due to the coacting couple effect, such that when the cam-reacting means is disengaged from the hearth cam means during rotary movement of the rabble arm, the weighted member drops by gravity along said arcuate path and strikes the blades to dislodge any particulate material adhering thereto.
  • the furnace 10 illustrated for use in roasting molybdenum sulfide ore is comprised of an outer shell 11 of suitable heat resistant material supported on legs 12, the furnace having a plurality of multi-level hearths 13, each having a centrally located axial opening through which a hollow shaft 14 passes and is rotatably supported by a base 15.
  • the hollow shaft is provided with a bevelled gear 16 which is driven by drive gear 17 mounted on motor 18 which is supported on pillow block 19.
  • the hollow shaft is provided with an air feed opening 20 through which air is fed, the hollow shaft having air exit openings at each hearth level through which the air flows into the rabble arms at each hearth level while circulating from the bottom to the top of the furnace.
  • Gas is fed by means (not shown), the gas conventionally circulating as shown by the arrows.
  • certain of the hearths may have outlet flues to promote cross flow (note FIG. 2).
  • the air flow serves a two-fold purpose: it helps to keep the furnace from overheating, otherwise the calcined material tends to stick together and, secondly, it provides the necessary oxidizing atmosphere for roasting the ore.
  • Each hearth has associated with it rabble arms 21 which project radially outward from the shaft.
  • the sulfide concentrate is fed from the top of the furnace and falls from hearth to hearth as the concentrate is being rabbled. If the concentrate clogs the blades by sticking, then uniform feeding is adversely affected.
  • the rabbling is such that, on one hearth, the particulate material is rabbled outwardly and deposits on the next hearth below, the rabble arms on the next hearth being adapted to move the concentrate radially inwardly until it deposits on the next succeeding hearth below it, and so on.
  • the concentrate or particulate material courses its way downward, it is converted to an oxide and is discharged as calcine at the bottom at 22. As the S forms, it leaves with the flue gas at the top through flue exit 23.
  • the temperature profile may reach a steady state.
  • the temperature appears to be highest at hearths No. 2 to No. 4, the temperature falling within the range of about l,200 to l,350F.
  • the temperature on these hearths is frequently above the control temperature, while the temperature at the lower hearths is generally controlled under conventional practice. Sticking of the calcine can be a problem at the higher temperature.
  • the rabble arms are shown in more detail in FIGS. 2 and 3.
  • FIG. 2 is a fragmented section in elevation of a multihearth roasting furnace of the type shown in FIG. 1, FIG. 3 being a plan view taken along line 33 of FIG.
  • FIG. 1 Using the same numerals of FIG. 1, a fragment of the vertically disposed hollow shaft 14 is shown passing centrally through hearths 13A, 13B, 13C and 13D which extend radially inward from shell 11. For clarity, only one set of rabble arms 21 is shown.
  • the rabble arms move the material being roasted inwardly towards the hollow shaft where it drops off of hearth 13A onto hearth 13B, where it is rabbled outwardly (towards the furnace wall or shell) by rabble arms (not shown) where the material drops through openings 13B-1 onto the next succeeding hearth 13C, the material then being rabbled inwardly by arms 21, the material dropping off of hearth 13C onto hearth 13D below, and so on.
  • the byproduct sulfur dioxide is exhausted through flue 23.
  • the shell 11 is normally provided with door openings 30 at each hearth level for entrance with a bar for striking the rabbles to dislodge calcine sticking to blades 31.
  • FIG. 4 and the plan view of FIG. show a fragment of a rabble arm 21 having a plurality of spaced blades 31 depending downwardly therefrom, said blades being freely supported by means of a dove-tail coupling 32 (note FIG. 6) via a mating slot 33 running longitudinally along the bottom of the rabble arm.
  • the rabble arm is supported by a vertically disposed rotatable shaft (not shown) in FIGS. 4 to 7, reference in this connection being made to FIGS. 1 to 3.
  • the rabble arms comprise two or more for each hearth.
  • the hammer assembly is pivotally supported by the rabble arm, the assembly being attached to the back of the rabble arm (note FIGS. 6 and 7).
  • the hammer assembly is designated generally by the numeral 34.
  • the hammer assembly is comprised of a shaft 35 to which is rigidly attached at one end thereof a camreacting member 36 in the form of a crank arm comprising spaced arms 36A 36B rigidly fixed to shaft 35, the free end of the arms having a roller 37 supported therebetween for making contact with a fixed cam surface 38 attached to hearth 39 shown fragmentarily in FIG. 4.
  • Shaft 35 rests in two or more brackets 40 cast as an integral part ofthe rabble arm (note FIG. 7).
  • the brackets have U-shaped slots 40A therein for receiving and supporting shaft 35.
  • crank arms 41 Depending downwardly from shaft 35 and rigidly attached thereto are a series of spaced crank arms 41 for supporting a weight member 42 in the form of a bar in gravity contact with each of the blades 31 of the rabble arm. That is to say, bar 42 traverses and contacts all of the blades so that when the bar is allowed to drop (as will be described later), it strikes all of the blades to dislodge adhering particulate material therefrom.
  • cam-reacting roller 37 contacts stationary cam 38 which, in FIG. 6, causes cam-reacting member 36 to move along a counterclockwise are as shown by the arrows.
  • roller 37 of cam-reacting member 36 has moved to the end of the stationary cam 38, it is freely released to return to its original position as the weight member or bar 42 drops by gravity to strike across blades 31.
  • the impact dislodges material which may have accumulated on or against the rabble blades in the interval between the cam positions (38) around the.
  • the cams 38 are rigidly attached to the stationary walls of the hearth, preferably at door openings 30, to allow for access during maintenance.
  • the number of hammer strikes or impacts per revolution of center shaft is determined by the number of cams installed on each hearth. Simultaneous operation of the assembly on all hearths is avoided by indexing the position of the fixed cams around the roaster so that impacts are substantially staggered rather than simultaneous.
  • the shaft 35 is subjected to torsional loads and exposed to temperatures in the neighborhood of about l,000 to 1,400F range.
  • HK Alloy also referred to as AMS 5365
  • This alloy contains by weight 24 to 28 percent chromium, 18 to 22 percent nickel, 2 percent maximum silicon, 0.2 to 0.6 percent carbon and the balance iron.
  • the same material with an inner core of carbon steel may be used as the impact bar.
  • the outer sheath of HK Alloy provides rigidity and protection against the furnace atmosphere.
  • the carbon steel adds mass and provides the desired ductility.
  • the magnitude of impact on the rabble blades is governed by the mass of the weighted member or impact bar, the center line distance between shaft 35 and impact bar 42, and by the are through which roller 37 moves. This are is governed by the dimensions of fixed cam 38.
  • the crank arm may be made of heat resistant material well known in the art.
  • rabble arm extending radially outward from a vertically disposed rotatable shaft for moving said rabble arm in a circular path, said rabble arm having blades extending downwardly therefrom for contacting and raking particulate metalliferous material in a roasting hearth,
  • a rabble arm cleaning device cooperably associated with said rabble arm comprising a hammer assembly pivotally mounted to said rabble arm, said pivotally mounted hammer assembly having a weighted longitudinal member disposed below the pivot and extending longitudinally of said rabble arm in gravity contact with said blades, and a cam-reacting member disposed above said pivot with a free end extending above said rabble arm,
  • said cam-reacting member is caused to strike a stationary cam disposed in the path of travel of said cam-reacting member, whereby said cam-reacting member is caused to rock about the pivot to raise and release said weighted member which strikes said blades to dislodge any particulate material adhering thereto.
  • said hammer assembly comprises a shaft pivotally mounted to and along said rabble arm, wherein said cam-reacting member is rigidly integral with said shaft and extends upwardly therefrom. and wherein said weighted member is a bar supported below said shaft by at least two spaced crank arms rigidly coupled to said shaft and extending downwardly therefrom.
  • a rabble arm extending radially outward from a vertically disposed rotatable shaft for moving said rabble arm in a circular path, said rabble arm having blades extending downwardly therefrom for contacting and raking particulate metalliferous material in a roasting hearth
  • a rabble arm cleaning device cooperably associated with said rabble arm comprising a hammer assembly pivotally mounted to said rabble arm, said hammer assembly comprising bracket means integral with said rabble arm, a rotatable shaft supported by said bracket means and running longitudinally of said rabble arm, said shaft serving as a pivot means, a cam-reacting member rigidly coupled to said rotatable shaft and disposed upwardly thereof with a cam-actuating free end extending above said rabble arm.
  • crank arms rigidly coupled to said rotatable shaft and extending downwardly therefrom, and a weighted member in the form of a bar rigidly coupled to said crank arms, said bar extending longitudinally of said rabble arm in gravity contact with said blades, said cam-reacting member and said crank arms with the weighted bar forming a coacting couple about said pivot means,

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Tunnel Furnaces (AREA)
  • Baking, Grill, Roasting (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
US448842A 1974-03-07 1974-03-07 Rabble cleaning device Expired - Lifetime US3874644A (en)

Priority Applications (12)

Application Number Priority Date Filing Date Title
US448842A US3874644A (en) 1974-03-07 1974-03-07 Rabble cleaning device
CA212,280A CA1019952A (en) 1974-03-07 1974-10-25 Rabble cleaning device
GB4783074A GB1441551A (en) 1974-03-07 1974-11-05 Rabble cleaning device
SE7413909A SE404547B (sv) 1974-03-07 1974-11-06 Rakarm i kombination med en rengoringsanordning for densamma
DE19742453935 DE2453935C3 (de) 1974-03-07 1974-11-14 Krählarm zum Krählen metallhaltigen Guts, das sich in einem Röstofen befindet
AT923574A AT339617B (de) 1974-03-07 1974-11-18 Krahlarm zum krahlen metallhaltigen, in einem rostofen befindlichen gutes
FR7437860A FR2263478B1 (sv) 1974-03-07 1974-11-18
IT9633/74A IT1023798B (it) 1974-03-07 1974-11-19 Dispositivo pulitore per bracci me soclatori presenti in forni di arrostimento ed altro
BE150677A BE822386A (fr) 1974-03-07 1974-11-19 Bras de rable et dispositif de nettoyage associe
LU71325A LU71325A1 (sv) 1974-03-07 1974-11-21
NLAANVRAGE7415425,A NL175339C (nl) 1974-03-07 1974-11-26 Roostoven.
JP14165174A JPS5735390B2 (sv) 1974-03-07 1974-12-11

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US448842A US3874644A (en) 1974-03-07 1974-03-07 Rabble cleaning device

Publications (1)

Publication Number Publication Date
US3874644A true US3874644A (en) 1975-04-01

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Family Applications (1)

Application Number Title Priority Date Filing Date
US448842A Expired - Lifetime US3874644A (en) 1974-03-07 1974-03-07 Rabble cleaning device

Country Status (11)

Country Link
US (1) US3874644A (sv)
JP (1) JPS5735390B2 (sv)
AT (1) AT339617B (sv)
BE (1) BE822386A (sv)
CA (1) CA1019952A (sv)
FR (1) FR2263478B1 (sv)
GB (1) GB1441551A (sv)
IT (1) IT1023798B (sv)
LU (1) LU71325A1 (sv)
NL (1) NL175339C (sv)
SE (1) SE404547B (sv)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5173047A (en) * 1991-09-06 1992-12-22 Salem Furnace Co. Shrouded rabbles for use in rotary hearth furnaces
US5810580A (en) * 1996-11-22 1998-09-22 Techint Technologies Inc. Mixing rabble for a rotary hearth furnace
LU90793B1 (en) * 2001-06-26 2002-12-27 Wurth Paul Sa Multiple heath furnace
US20070209563A1 (en) * 2004-06-02 2007-09-13 Paul Wurth S.A. Multi-Level Furnace
KR20190010564A (ko) * 2016-05-27 2019-01-30 사다치 엔브이 배소로, 이의 사용 및 광석 또는 정광의 처리 방법
CN111974270A (zh) * 2020-09-17 2020-11-24 俞益波 一种建筑用搅拌机

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1143550B (it) * 1981-04-14 1986-10-22 Claudia Ceretti Forno industriale

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1836002A (en) * 1925-12-05 1931-12-15 Balz Georg Furnace for roasting zinc blende

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1836002A (en) * 1925-12-05 1931-12-15 Balz Georg Furnace for roasting zinc blende

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5173047A (en) * 1991-09-06 1992-12-22 Salem Furnace Co. Shrouded rabbles for use in rotary hearth furnaces
US5810580A (en) * 1996-11-22 1998-09-22 Techint Technologies Inc. Mixing rabble for a rotary hearth furnace
LU90793B1 (en) * 2001-06-26 2002-12-27 Wurth Paul Sa Multiple heath furnace
WO2003002925A1 (en) * 2001-06-26 2003-01-09 Paul Wurth S.A. Multiple hearth furnace
US20040157182A1 (en) * 2001-06-26 2004-08-12 Patrick Hutmacher Multiple hearth furnace
US6802710B2 (en) 2001-06-26 2004-10-12 Paul Wurth S.A. Multiple hearth furnace
AU2002316987B2 (en) * 2001-06-26 2006-10-19 Paul Wurth S.A. Multiple hearth furnace
CN100353133C (zh) * 2001-06-26 2007-12-05 保尔·沃特公司 多炉膛炉
US20070209563A1 (en) * 2004-06-02 2007-09-13 Paul Wurth S.A. Multi-Level Furnace
US7735434B2 (en) * 2004-06-02 2010-06-15 Paul Wurth S.A. Multiple-hearth furnace
KR20190010564A (ko) * 2016-05-27 2019-01-30 사다치 엔브이 배소로, 이의 사용 및 광석 또는 정광의 처리 방법
CN111974270A (zh) * 2020-09-17 2020-11-24 俞益波 一种建筑用搅拌机

Also Published As

Publication number Publication date
LU71325A1 (sv) 1975-05-28
JPS5735390B2 (sv) 1982-07-28
FR2263478A1 (sv) 1975-10-03
DE2453935A1 (de) 1975-09-11
SE404547B (sv) 1978-10-09
BE822386A (fr) 1975-03-14
FR2263478B1 (sv) 1978-04-28
NL175339B (nl) 1984-05-16
NL7415425A (nl) 1975-09-09
DE2453935B2 (de) 1977-06-23
NL175339C (nl) 1984-10-16
AT339617B (de) 1977-10-25
JPS50120403A (sv) 1975-09-20
CA1019952A (en) 1977-11-01
ATA923574A (de) 1977-02-15
SE7413909L (sv) 1975-09-08
GB1441551A (en) 1976-07-07
IT1023798B (it) 1978-05-30

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