US3533510A - Device for de-watering mud,sludge or fibre suspensions - Google Patents

Device for de-watering mud,sludge or fibre suspensions Download PDF

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Publication number
US3533510A
US3533510A US833388A US3533510DA US3533510A US 3533510 A US3533510 A US 3533510A US 833388 A US833388 A US 833388A US 3533510D A US3533510D A US 3533510DA US 3533510 A US3533510 A US 3533510A
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United States
Prior art keywords
outlet opening
drum
screw
opening
plug
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Expired - Lifetime
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US833388A
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English (en)
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Tad Glowacki
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Individual
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Individual
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
    • C02F11/125—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using screw filters
    • 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
    • B30B9/18—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 with means for adjusting the outlet for the solid

Definitions

  • a de-watering device for mud, sludge or fibre suspensions having a feeder screw mounted for rotation in a perforated drum in which the feeder screw feeds the mass to be de-watered from an inlet opening to an annular outlet opening formed between an extension of the core of the feeder screw and the end portion of the cylindrical wall of said drum, and in which there are a plurality of tiltably pivoted flaps covering the outlet opening, each flap being individually biased so as to open individually against the bias under the influence of the pressure from the de-watered pulp.
  • the present invention relates to a device for de-watering mud, sludge or fibre suspensions, said device comprising a feeder screw. a drum surrounding said feeder screw. said drum being preferably provided with perforations. an inlet opening in one end of said drum and an annular outlet opening in the other end of said drum, said outlet opening being formed between a circular opening in the end wall portion ofthe drum and a flow regulator which is located on the extension of the core of said screw.
  • the suspension supplied to the device is caught by the threads of the feeder screw and is fed forwards towards the annular outlet opening.
  • the material is compressed owing to the fact that the outlet opening is rather narrow and thereby water or other liquid is removed from the compressed material and is brought to flow away through the perforations of said drum.
  • the remaining water content of the pulp, which is fed out through the outlet opening is to a great degree determined by the size of the outlet opening.
  • the size of the outlet opening variable, for example by arranging the generally conical flow regulator spring loaded in an axial direction, so that, when a tendency for. forming plugs or knots occurs in the outlet opening, the flow regulator is displaced outwards from the outlet opening whereby the outlet opening automatically will be greater. Therefore, the plug or knot will be fed out so that the pressure of the pulp at the outlet opening will be decreased. Thereafter, said flow regulator will be displaced towards the outlet opening, under the action of the spring force, to its original position.
  • a screw press is also known in which the end wall portion of the drum where the annular outlet opening is formed, is divided in four parts, each part being spring loaded and displaceable radially outwards from an extension of the screw which extends through the outlet opening.
  • each quarter of said wall portion can be displaced outwards individually. No great improvement regarding the uniform dewatering operation of the device has, however, been noticed by using said arrangement. Ifa plug is formed round the whole annular outlet opening, and a part of said plug later is broken through and fed out, this does not generally lead to that one of the parts of the wall portion is displaced inwards again and, therefore, great quantities of insufficiently de-watered pulp are fed out through the opening.
  • One object of the present invention is to provide a device for de-watering sludge, mud or fibre suspension in which the drawbacks of the hitherto known devices are avoided and which gives a uniformly de-watered pulp even if the mass supplied to the devicehas a great tendency for forming knots or plugs.
  • a device for de-watering mud, sludge or fibre suspension comprising a feeder screw. a drum surrounding said feeder screw and provided with perforations, an inlet opening at one end of the drum, and an annular outlet opening at the other end of the drum, said outlet opening being formed between a projecting cylindrical member which forms an extension of the core of the feeder screw and the edge of a circular opening in the end wall portion of said drum. and in which said end wall is divided into a plurality of parts, each part being individually resiliently biassed towards said cylindrical member.
  • each portion of said end wall has the shape of a trapezium and each such wall portion is tiltably pivoted with its longest parallel edge to a pivot axis which is located at a distance from the periphery of said cylindrical member which corresponds to the maximum obtainable radial width of said outlet opening and each wall portion has a tangential length which is substantially equal to its radial width.
  • the resilient pressure applied to each wall portion is obtained by a pneumatic cylinder and a piston in said cylinder, in a manner known per se.
  • FIG. 1 illustrates a de-watering device according to the invention, as viewed from the side, in one of its operating conditrons.
  • FIG. 2 is the same device as in FIG. I in another operating condition.
  • FIG. 3 is the same device as viewed from the outlet end.
  • FIG. 4 is a section through the inlet opening of a de-watering device of a conventional construction.
  • FIG. 5 is a corresponding section of the device according to a modification of this invention.
  • a base plate of the de-watering device is designated 1.
  • the device comprises a feeder screw 2 and a perforated drum 3 surrounding said feeder screw.
  • the drum 3 is provided with an inlet opening 4, which is directed radially into the drum.
  • the fluid which is pressed from the treated suspension is removed through the perforations of the drum and is allowed to flow away through a channel 5 or the like.
  • the drum 3 has an annular end wall which according to the shown embodiment of the invention, is divided into twelve trapezium shaped wall portions (see FIG. 3).
  • Each wall portion 6 is rotatably hinged by hinge means 7 at the longest parallel edge of said wall portion.
  • Each wall portion 6 is actuated by a lever 8, one end of said lever being fastened to the wall portion and the other being linked to a piston rod 9.
  • the piston rod 9 carries a piston 10 which is slidable in an air pressure cylinder 11. The pressure in the cylinder 11 behind the piston is sufficiently great to keep each wall portion 6 substantially to rest on the periphery of a flow regulator I2 which is integral with or constitutes an extension of the core of the screw 2.
  • the screw 2 is connected to or forms a part of a shaft 13 which is pivoted in a front bearing [5 and in a rear bearing 15a (schematically illustrated in FlG. 1).
  • the annular outlet opening 14 between the wall portions 6 and the flow regulator 12 is closed or very small.
  • mud or sludge is supplied to the inlet opening 4 and transported forward towards the outlet opening l4.
  • it will be compressed by the threads of the screw 2, whereby liquid is removed through the perforation of the drum 3 and allowed to flow away through the channel 5.
  • the de-watercd pulp is fed out through the outlet opening 14 and thereby the wall portions 6 will be tilted outwards towards the position shown in FIG. 2, against the action of the resilient pressure from the air cylinders 11.
  • the wall portions Before the wall portions have been entirely tilted outwards to parallelity with the axial direction of the screw 2. there will be a star-shaped outfccd opening formed.
  • the wall portions 6 will be opened more to let such plug pass. If, however, the plug is broken through in one place, one or several wall portions, which are located at that particular place, will be closed independent of the other wall portions, so that the outlet opening at that particular place will be decreased. Because of that, a pressure is again formed behind the flow regulator 12, so that the de-watering procedure will continue undisturbed.
  • the screw 12 may be driven from a stud H6 at the right end of the screw, said stud being connected to a motor or some other machine (not shown).
  • FIG. 4 there is a cross section through the inlet opening and the feeder screw ofa de-watcring device of a conventional type and in FIG. is the corresponding cross section of a preferred embodiment of the device according to the invention illustrated.
  • the conventional device see FIG. 4 it frequently happens that the sludge or mud which is supplied to the inlet opening 4 is baked together to a plug or knot i7, which prevents the substance from being fed down into the threads of the screw and therefore the screw has a tendency to run unloaded.
  • FIG. 5 there is illustrated how a device according to the invention should be shaped in order to avoid said difficulty.
  • the width of the inlet opening is increased at the inlet side of the screw so that a wedgeshaped pocket 18 is formed between the screw threads and the adjacent wall of the inlet opening 4.
  • the material which is supplied to the inlet opening is forced down into the pocket it because of the movement of the screw.
  • the materia'l will be pressed harder and harder between the wall portion of the inlet opening 4 and the screw and into the threads of the screw and will be fed forwards by the screw as intended.
  • a feeder screw having a projecting cylindrical member constituting an extension of the core thereof;
  • a perforated drum surrounding said feeder screw.
  • said drum having an inlet opening at one end thereof, the other end of the drum and said cylindrical member defining an annular outlet opening;
  • flow regulator means for controlling the size of the outlet opening, said flow regulator including a plurality of trapa-' zoid-shaped wall portions each mounted onsaid drum for pivotal movement about its longest parallel edge;
  • said biasing means includes a plurality of pneumatic devices carried by said drum, each of said devices comprising an air pressure cylinder having a piston connected at the free end thereof to one of said wall portions.
  • said inlet opening comprises a wedge-shaped pocket formed between that side of the feeder screw moving away from the inlet opening and the adjacent wall portion of the inlet opening to force material to be de-watered down into the pocket thus formed and into the thread of said feeder screw.
  • a device according to claim 1 wherein said feeder screw includes a continuous thread having multiple turns about said core.
  • a device wherein said feeder screw is substantially horizontal and wherein said inlet opening is directed radially into said drum.
  • a device according to claim 1 wherein said feeder screw is substantially horizontal and wherein said inlet opening is directed radially into said drum.
  • each of said wall portions is substantially equal to the length of the longest parallel side thereof.
  • said biasing means includes a plurality of pneumatic devices carried by said drum, each of said devices comprising an air pressure cylinder having a piston connected at the free end thereof to one of said wall portions.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Sludge (AREA)
  • Filtration Of Liquid (AREA)
  • Paper (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
US833388A 1968-06-26 1969-06-16 Device for de-watering mud,sludge or fibre suspensions Expired - Lifetime US3533510A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE869468 1968-06-26

Publications (1)

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US3533510A true US3533510A (en) 1970-10-13

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US833388A Expired - Lifetime US3533510A (en) 1968-06-26 1969-06-16 Device for de-watering mud,sludge or fibre suspensions

Country Status (6)

Country Link
US (1) US3533510A (fi)
FI (1) FI51972C (fi)
FR (1) FR2016769A1 (fi)
GB (1) GB1257959A (fi)
NO (1) NO125576B (fi)
SU (1) SU520879A3 (fi)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990002224A1 (en) * 1988-08-19 1990-03-08 Sprout-Bauer, Inc. Pulp wash press
US4976819A (en) * 1988-04-28 1990-12-11 Potlatch Corporation Pulp treatment methods
US20100006491A1 (en) * 2007-02-08 2010-01-14 Wam S.P.A. Device for dehumidifying and compacting solids contained in sewage for disposal
EP3597417A1 (en) * 2018-07-20 2020-01-22 US Farm Systems, Inc. Screw press for separation of liquids from bulk materials
CN112044606A (zh) * 2020-08-26 2020-12-08 郑兴荣 一种堆叠式水污染物干湿分离箱

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4976819A (en) * 1988-04-28 1990-12-11 Potlatch Corporation Pulp treatment methods
WO1990002224A1 (en) * 1988-08-19 1990-03-08 Sprout-Bauer, Inc. Pulp wash press
US20100006491A1 (en) * 2007-02-08 2010-01-14 Wam S.P.A. Device for dehumidifying and compacting solids contained in sewage for disposal
US8151702B2 (en) 2007-02-08 2012-04-10 WAM Industriale S.p.A Device for dehumidifying and compacting solids contained in sewage for disposal
EP3597417A1 (en) * 2018-07-20 2020-01-22 US Farm Systems, Inc. Screw press for separation of liquids from bulk materials
CN112044606A (zh) * 2020-08-26 2020-12-08 郑兴荣 一种堆叠式水污染物干湿分离箱

Also Published As

Publication number Publication date
FI51972C (fi) 1977-05-10
DE1931474A1 (de) 1970-02-26
NO125576B (fi) 1972-10-02
FR2016769A1 (fi) 1970-05-15
FI51972B (fi) 1977-01-31
GB1257959A (fi) 1971-12-22
SU520879A3 (ru) 1976-07-05
DE1931474B2 (de) 1976-07-22

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