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US3070005A - Thickener and washer - Google Patents

Thickener and washer Download PDF

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Publication number
US3070005A
US3070005A US48927A US4892760A US3070005A US 3070005 A US3070005 A US 3070005A US 48927 A US48927 A US 48927A US 4892760 A US4892760 A US 4892760A US 3070005 A US3070005 A US 3070005A
Authority
US
United States
Prior art keywords
housing
pulp
screw
passage
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 - Lifetime
Application number
US48927A
Other languages
English (en)
Inventor
Edwin V Kemp
Albert J Botkin
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.)
Bauer Brothers Co
Original Assignee
Bauer Brothers Co
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
Priority to DENDAT1302893D priority Critical patent/DE1302893B/de
Application filed by Bauer Brothers Co filed Critical Bauer Brothers Co
Priority to US48927A priority patent/US3070005A/en
Priority to FI610676A priority patent/FI44086C/fi
Priority to SE5791/61A priority patent/SE309152B/xx
Priority to GB26421/61A priority patent/GB959481A/en
Application granted granted Critical
Publication of US3070005A publication Critical patent/US3070005A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B9/00—Presses specially adapted for particular purposes
    • B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
    • B30B9/12—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using pressing worms or screws co-operating with a permeable casing
    • B30B9/16—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using pressing worms or screws co-operating with a permeable casing operating with two or more screws or worms
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/30—Defibrating by other means
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/18—De-watering; Elimination of cooking or pulp-treating liquors from the pulp
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water

Definitions

  • the object of the invention is to simplify the construction as well as the means and mode of operation of thickeners and washers, whereby such equipment may not only be economically manufactured, but will be more efficient and satisfactory in use, adaptable to a wide variety of applications, and be unlikely to get out of order.
  • a further object of the invention is to introduce in thickening or density increasing equipment of the kind described a principle of pressure feed whereby the pulp or fibrous solids are supplied under pressure to subsequently encountered process equipment.
  • Another object of the invention is to utilize a principle of controlled back pressure in a thickening device as described whereby to conform to the use of materials of diiferent initial density and to vary the amount of compression applied to the bulk material to regulate the amount of fluids extracted.
  • a further object of the invention is to present a generally new feeder for low density materials combining aconcept of force feeding with that of controlled dewatering or thickening ofthe material.
  • Still another object of the invention is specifically to improve thickening devices as described through the use of means to obtain a substantially uniform application of pressure to the material being fed, despite losses of fluid therefrom, as well as to provide for the creation of pressure zones along the length of the feeding apparatus.
  • a further object of the invention is to provide a thickener and washer possessing the advantageous structural features, the inherent meritorious characteristics and the mode of operation herein mentioned.
  • FIG. 1 is a view in side elevation of pressure feeding apparatus in accordance with an illustrated embodiment of the invention
  • FIG. 2 is a view in end elevation of the apparatus of FIG. 1;
  • FIG. 3 is a top view of the apparatus of FIG. 1, the feed mechanism being shown in longitudinal section.
  • the invention in its illustrative embodi ment is comprised in apparatus for thickening pulp material in the course of its movement in liquid suspension to refiners or like pulp treating equipment.
  • Screening and cleaning of the pulp usually is carried out with the pulp at a very low percentage of solids or at what may be considered a low density.
  • a pulp treatment process conventionally provides a refining step. To do this effectively the pulp consistency must be increased or be made more dense. Also, when pulp is placed in storage it is desirable to increase the consistency to the maximum at which the material can be pumped.
  • Thickening apparatus in accordance with the present invention would, in such a pulp handling system, be arranged to receive screened and cleaned pulp, thicken it to a consistency of a selected density value and then direct it to the refiners or to a storage chest in accordance with the requirements of the work, the supply to a refiner being in accordance with the present inventive concept accomplished under pressure to increase the refiner capacity and the versatility of its work.
  • the apparatus as disclosed is further capable, however, of handling a wide variety of materials and so can be used advantageously in industries other than paper pulp processing. Similarly it is not limited to functioning as a pressure feeder in such systems but has general application as a dewatering or low pressure washing means. In the latter instance Water or other liquid is introduced and mixed with the pulp before its entry into the machine and is there drained with a consequent carrying off ofunwanted solids from the pulp material.
  • apparatus in accordance with the illustrated embodiment of the invention takes the form of a unitary machine forming a part of a continuous pulp treatment process, and being stationed to receive watered pulp material, to place the material under pressure for a draining of excess liquid therefrom, and to de liver the dewatered or thickened pulp to a subsequent processing stage such as to a screw press or to a refiner.
  • the apparatus rests upon a sup port 10 and comprises power and working units 11 and 12 respectively.
  • the former is mounted on a base 13 and includes a motor 14 which through a belt 15 and a gear reduction means 16 rotatably drives a shaft 17 extending to the work performing unit 12.
  • the latter is mounted on a base 18 which extends generally longitudinally of the support 1% and at right angles to the base 13.
  • a housing 19 rests on the base 18 and has its longitudinal axis parallel to and laterally offset from the shaft 17.
  • One end of the housing 19 faces the shaft 17 and receives a cylindrical housing 21 closed at its outer end by a plate 22 providing a bearing for the shaft 17'and also for one end of another shaft 23, the two shafts 23 and 17 or unitary continuations thereof extending longitudinally within the housing 19 in parallel spaced relation.
  • Feed means in the form of a shaft 31 having a helicoid screw device 32 thereon is longitudinally disposed in the passage 23 for relative rotary motion.
  • the shaft'31 extends through the rearward or closed end of the housing 27 and is powered for independent rotation by means ineluding a motor 33, a variable speed drive 364 and a driving connection 35.
  • the helicoid surface 32 projects substantially into contact with the walls of passage 28 and so restricts or substantially precludes movement of material through such passage except in conjunction with rotation of the feed device.
  • the latter in accordance with characteristics of devices of this kind, feeds or advances to the forward or open end of the passage material supplied to the helicoid surface through the laterally disposed opening 29.
  • the opening 29 in the supplemental housing 27 registers through the adapter 26 with a longitudinal extending flow passage 36 of reduced diameter within housing 19.
  • the passage 36 is defined by a cage extending between transversely disposed end plates 37 and 38 in the housing 19.
  • Such cage has a generally oval shape in order closely to enclose the shafts 17 and 21, these shafts having sleeves 39 and 41 thereon respectively formed with helicoid sur faces 42 and 43, the peripheries of which approach a scraping contact with the cage.
  • the latter comprises longitudinally extending laterally spaced apart wires or rods 44 over which are placed transversely extending longitu dinally spaced apart bars 45.
  • the latter are wrapped around the exterior of the rods 44 and are individually welded thereto to define and to maintain a predetermined spaced relation of the rods as well as maintaining a unitary relation between the rods and laterally extending bars.
  • a circular arrangement of wires 46 may be interposed between the rods 44 and the bars 45 to interconnect one with the other.
  • the housing 19 is formed with an inlet 47 disposed in the processing system to receive the wet bulk material or the mixture of liquid and solids.
  • T he inlet 47 is located to introduce the material for treatment into the passage 36 at one end thereof and upon the sleeves 39 and 41 upon the shafts 1'7 and 23.
  • the sleeves 39 and 41, together with the helicoid surfaces 43 and 42, make up a screw feeding device wherein the surfaces 42 and 43 constitute the flights of the screws. ese flights have respectively opposite inclinations, and, since the direction of rotation of the shafts is counter to one another both screws rotate in a direction to advance the incoming material through the passage 36 toward the opposite end thereof.
  • the twin screws are in parallel adjacent relation with the helicoid surfaces 42 and 43 overlapping at their peripheries, or, in effect, interfitting.
  • pulp material In response to rotation of the screws, in the presence of admitted pulp material, such material is picked up by the flights or helicoid surfaces of the screws and propelled in substantially a straight line without appreciable rotary movement with either of the screws.
  • the overlapping of the helicoid surfaces provides interference zones wherein portions of the pulp are transferred from one surface to another, and, further, the overlapping of such surfaces in effect reduces the space between adjacent flights of the screw means. Compression forces are generated between adjacent flights in a manner tending to express fluids from the material. These fluids are permitted to drain through or to be expelled through the rods 44 of the surrounding cage.
  • the helicoid surfaces or flights of the screws are constructed with a decreasing pitch, or constructed with a decrease in spacing between adjacent flights toward the outer end of the feeding device or in the direction of movement of the material through the passage 36. Also, the flights of the screws are"made discontinuous, there being in the illustrated instance locations 49 and 51 upon each screw sleeve where the helicoid surface is interrupted.
  • the screw feed mechanism operable in housing 19 continuously expels a thickened material of increased density from the housing through the adapter 26. It is admitted to supplemental housing 27 through opening 29 and there encounters the feed screw 3132. Restricted in its movement by such encounter, the material is progressively fed from the supplemental housing through the passage 28 in response to rotation of the feed screw therein and at a rate determined by the speed of operation of such feed screw.
  • the latter as noted, being independently operated and controlled through a motor 33 and variable speed drive 34, is adapted to have its speed of operation varied independently of that of the main feed screw in housing 19 with the result that the back pressure created in passage 36 by the feed screw 31-32 is variable.
  • the apparatus has been disclosed as operating in a generally horizontal position, that is with its major axis parallel to the floor on which it rests. In view of the construction of the unitary machine, however, and in the light of its concept of pressure feeding, the machine may with suitable support modification be arranged in vertical and intermediate positions without material affect upon its construction and mode of operation. Also, the back pressure in passage 36 may be varied by regulating the speed of operation of either one or both of the feed screw devices.
  • apparatus to increase the density thereof including a cage having a drainer portion and at opposite ends thereof an inlet and an outlet for the wet bulk material, an outlet housing connected to said cage to receive the material therefrom through said outlet and having an outlet passage extending angularly across said cage outlet, a screw feeding device in said cage operable to advance admitted material from said inlet to said outlet, expressed fluid escaping by way of said drainer portion, and another screw feeding device in said outlet housing longitudinally disposed in said outlet passage to have material from said cage outlet deposited laterally thereon, said last mentioned device restricting movement of the material issuing from said cage, and means for varying the back pressure in said cage in which the screw feeding device operates by varying the speed of operation of said screw feeding device in said outlet housing.
  • apparatus for the force feeding of such material including first and second feed screw means in series relation, said second means being arranged approximately at right angles to the first said means with the said second screw means extending transversely across the axis of the first screw means, housing means enclosing said second feed screw means, said housing means providing an inlet for the Wet bulk material for the feeding thereof by said first screw feed toward the said second screw means and further providing a drainer section for the escape of fluids expressed from the material by said first screw feed means, said housing means extending into confining relation to the material as it moves from said first screw feed means to the second, said housing further providing an outlet passage for the material as it leaves said second screw feed means, and means for varying the back pressure in said housing means enclosing said first screw feed means by varying the speed of operation of said second screw feed means.
  • a thickening device including a main housing having an inlet and an outlet at opposite ends thereof, a supplemental housing receiving the bulk material from said outlet, said supplemental housing having an outlet offset from the outlet from said main housing, main feed screw means in said main housing operable to advance admitted material from said inlet to said outlet and other feed screw means in said supplemental housing extending across the outlet of said main housing to receive material admitted therefrom and advance it toward the outlet of said supplemental housing, said main housing being constructed for a permitted escape of fluid expressed by said feed screw means therein, the said other feed screw means restricting movement of the material to the outlet in said supplemental housing, and means to vary the back pressure around said main feed screw means by varying the speed of the other screw means in said supplemental housing.
  • a thickening and washing device characterized in that the said feed screw means in said main housing comprises twin screws discharging material onto the said other feed screw means in said supplemental housing at longitudinally spaced points thereon.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Screw Conveyors (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
US48927A 1960-08-11 1960-08-11 Thickener and washer Expired - Lifetime US3070005A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DENDAT1302893D DE1302893B (de) 1960-08-11 Schneckenpresse für feuchte Massen
US48927A US3070005A (en) 1960-08-11 1960-08-11 Thickener and washer
FI610676A FI44086C (fi) 1960-08-11 1961-04-10 Laite veden poistamiseksi märästä massa-aineesta
SE5791/61A SE309152B (de) 1960-08-11 1961-06-01
GB26421/61A GB959481A (en) 1960-08-11 1961-07-20 Thickener and washer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US48927A US3070005A (en) 1960-08-11 1960-08-11 Thickener and washer

Publications (1)

Publication Number Publication Date
US3070005A true US3070005A (en) 1962-12-25

Family

ID=21957184

Family Applications (1)

Application Number Title Priority Date Filing Date
US48927A Expired - Lifetime US3070005A (en) 1960-08-11 1960-08-11 Thickener and washer

Country Status (5)

Country Link
US (1) US3070005A (de)
DE (1) DE1302893B (de)
FI (1) FI44086C (de)
GB (1) GB959481A (de)
SE (1) SE309152B (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3215355A (en) * 1963-02-27 1965-11-02 Bauer Bros Co Feed means for a refiner
US3425640A (en) * 1963-11-27 1969-02-04 Kalle Ag Apparatus for the continuous transportation of pulverulent or fibrous material
US3450034A (en) * 1965-04-23 1969-06-17 Werner & Pfleiderer Installation for extracting liquid from vegetable matter
US3460466A (en) * 1965-12-14 1969-08-12 Bauer Bros Co Press structure
US3461793A (en) * 1967-06-26 1969-08-19 Stord Bartz Industri As Screw presses
US3470815A (en) * 1966-05-05 1969-10-07 Landsverk Ab Pulp press
US3780645A (en) * 1972-08-02 1973-12-25 Ward Foods Inc Screw press assembly

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE333095B (de) * 1967-04-21 1971-03-01 Calor & Sjoegren Ab
SE450104B (sv) * 1985-10-18 1987-06-09 Spirac Engineering Ab Anordning for komprimering av material och reduktion av dess vetskeinnehall
FR2801065A1 (fr) * 1999-11-12 2001-05-18 Exportation De Materiel Ind Procede pour la remise en pate de matieres premieres du type papiers, cartons, celluloses, dispositif de prehydratation pour la mise en oeuvre du procede et installation

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL18365C (de) *
GB461388A (en) * 1935-02-23 1937-02-16 Kampens Mek Verksted As Improvements in screw presses for pressing out liquid
US2119162A (en) * 1935-03-05 1938-05-31 Hartner Hans Andreas Screw press
US2249724A (en) * 1939-10-31 1941-07-22 Anderson Co V D Press
US2280880A (en) * 1940-01-26 1942-04-28 Anderson Co V D Variable choke mechanism for expeller presses

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL18365C (de) *
GB461388A (en) * 1935-02-23 1937-02-16 Kampens Mek Verksted As Improvements in screw presses for pressing out liquid
US2119162A (en) * 1935-03-05 1938-05-31 Hartner Hans Andreas Screw press
US2249724A (en) * 1939-10-31 1941-07-22 Anderson Co V D Press
US2280880A (en) * 1940-01-26 1942-04-28 Anderson Co V D Variable choke mechanism for expeller presses

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3215355A (en) * 1963-02-27 1965-11-02 Bauer Bros Co Feed means for a refiner
US3425640A (en) * 1963-11-27 1969-02-04 Kalle Ag Apparatus for the continuous transportation of pulverulent or fibrous material
US3450034A (en) * 1965-04-23 1969-06-17 Werner & Pfleiderer Installation for extracting liquid from vegetable matter
US3460466A (en) * 1965-12-14 1969-08-12 Bauer Bros Co Press structure
US3470815A (en) * 1966-05-05 1969-10-07 Landsverk Ab Pulp press
US3461793A (en) * 1967-06-26 1969-08-19 Stord Bartz Industri As Screw presses
US3780645A (en) * 1972-08-02 1973-12-25 Ward Foods Inc Screw press assembly

Also Published As

Publication number Publication date
FI44086B (de) 1971-04-30
GB959481A (en) 1964-06-03
DE1302893B (de)
SE309152B (de) 1969-03-10
FI44086C (fi) 1971-08-10

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