WO1996019614A1 - Separating arrangement - Google Patents
Separating arrangement Download PDFInfo
- Publication number
- WO1996019614A1 WO1996019614A1 PCT/SE1995/001505 SE9501505W WO9619614A1 WO 1996019614 A1 WO1996019614 A1 WO 1996019614A1 SE 9501505 W SE9501505 W SE 9501505W WO 9619614 A1 WO9619614 A1 WO 9619614A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- housing
- screening drum
- suspension
- outlet
- cleaning
- Prior art date
Links
- 238000012216 screening Methods 0.000 claims abstract description 31
- 238000004140 cleaning Methods 0.000 claims abstract description 30
- 239000000725 suspension Substances 0.000 claims abstract description 23
- 239000002245 particle Substances 0.000 claims abstract description 18
- 210000001520 comb Anatomy 0.000 claims description 20
- 239000000463 material Substances 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- -1 knots Substances 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
- B07B1/50—Cleaning
- B07B1/52—Cleaning with brushes or scrapers
- B07B1/526—Cleaning with brushes or scrapers with scrapers
- B07B1/528—Cleaning with brushes or scrapers with scrapers the scrapers being rotating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
- B01D29/13—Supported filter elements
- B01D29/15—Supported filter elements arranged for inward flow filtration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/44—Edge filtering elements, i.e. using contiguous impervious surfaces
- B01D29/46—Edge filtering elements, i.e. using contiguous impervious surfaces of flat, stacked bodies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/62—Regenerating the filter material in the filter
- B01D29/64—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element
- B01D29/6469—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element scrapers
- B01D29/6476—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element scrapers with a rotary movement with respect to the filtering element
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/18—Drum screens
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/18—Drum screens
- B07B1/20—Stationary drums with moving interior agitators
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
- D21D5/02—Straining or screening the pulp
- D21D5/023—Stationary screen-drums
- D21D5/026—Stationary screen-drums with rotating cleaning foils
Definitions
- the present invention relates to an arrangement for separating off undesired particles from a suspension stream in accordance with the precharacterizing clause of Patent Claim 1.
- the arrangement functions well for relatively low concentrations ( ⁇ 5% pulp fibres) .
- concentrations ⁇ 5% pulp fibres
- SE-B-426 180 there is a tendency, at higher concentrations, for the slits in the screening drum to clog up relatively quickly after the cleaning member has passed them, and there are difficulties in conveying the undesired particles off in an appropriate manner.
- the object of the present invention is to provide a screening arrangement which can clean undesired particles from a pulp suspension and in so doing can satisfy stringent requirements both as regards capacity and the possibility of treating the suspension flow at high concentration, and where the undesired particles can be led off from, and collected in a suitable way at, the screening arrangement.
- This object is achieved by means of an arrangement for separating off undesired particles from a suspension stream in accordance with the characterizing clause of Patent Claim 1.
- Figure 1 shows a side view, in partial cross-section, of the arrangement according to the invention
- Figure 2 shows a cross-sectional end view taken along the line II-II in Figure 1
- Figure 3 shows a detailed view of the screening drum according to a preferred embodiment
- Figure 4 shows a detailed view of one of the cleaning combs according to a preferred embodiment.
- the arrangement according to a preferred embodiment of the invention which is shown in Figures 1 and 2 consists of an essentially cylindrical housing 10 with a centre line C.
- the housing is provided with an inlet 11 for the suspension which is to be treated, which inlet 11 is placed approximately in the middle of the housing 10, and, along the periphery of the housing at a distance from the inlet, an outlet 12 for the particles which have been removed.
- the outlet 12 is arranged facing vertically downwards.
- the inlet and outlet are preferably offset by 90° along the periphery of the housing, but other configurations are also possible.
- the housing 10 is provided at each end with flanges 13, 14 which are mounted fixed in a suitable manner.
- One end 15 of the housing is open and functions as an outlet for the treated suspension.
- the end 15 is connected with the aid of the flange 13 to a conduit system (not shown) for onward transport of the suspension.
- the other end of the housing 10 is provided with an end wall plate 16 which is fastened releasably on the flange 14 of the housing, with the aid of screws 17 for example.
- a bearing member 18 is mounted on the end wall plate 16, and this bearing member 18 is also releasable.
- a drive shaft 20 which is rotatably mounted in the bearing member 18, extends through the centre of the end wall plate 16 and some distance into the interior of the housing, its axis of rotation preferably coinciding with the centre line C of the housing.
- the drive shaft 20 is sealed off from the end wall plate 16 with the aid of a suitable sealing member 21.
- the drive shaft 20 is made to rotate with the aid of a suitable drive arrangement (not shown) .
- a screening drum 25 ( Figure 3) , which is designed as a cylinder whose circumference is perforated by circular slits 26, is arranged in such a way that its centre line coincides with the axis of rotation of the drive shaft 20.
- the slits 26 are preferably shaped in such a way that their width slightly increases radially inwards in order to counteract clogging. The inward widening can be about 3° for each slit wall.
- the screening drum 25 is provided with radially inwardly directed spokes 28 for holding together the annular portions 27 between the slits 26.
- One end of the screening drum 25 is provided with a flange 29 for releasable mounting on an annular securing member 30 which is arranged in a fixed manner on the inner wall of the housing closely adjoining the outlet 15 for the treated suspension.
- the arrangement is also provided with cleaning members 35 ( Figure 4) in the form of cleaning combs with a number of teeth 36 which extend downwards in the slits 26 of the screening drum 25.
- These cleaning combs 35 are mounted diametrically opposite on a bracket 38.
- This bracket 38 is mounted releasably on a holder member 39 which is in turn mounted releasably on the end of the drive shaft 20.
- the cleaning combs 35 are designed essentially as an L profile lying on its side, with one limb of the L being directed inwards and arranged first in the direction of rotation R ( Figure 2) seen when the cleaning combs are mounted.
- Recesses have been formed in this inwardly directed limb for the purpose of receiving a number of teeth 36.
- the design is such because the cleaning combs are subjected during operation to high bending moments since they are secured on the holder 38 only at their one end.
- the teeth 36 are preferably provided with a bevel at their front edge, as seen in the direction of rotation R.
- the arrangement is preferably provided with supports 40 for mounting on a base plate, for example.
- the cleaning combs 35 which are two in number in the preferred embodiment, are made to rotate about the circumferential surface of the screening drum 25, counterclockwise in Figure 2, and with the cleaning teeth 36 in the slits of the screening drum.
- the cleaning combs 35 are preferably placed diametrically opposite each other in order to obtain an even load on the drive shaft 20.
- the suspension which is to be treated, and which contains undesired particles such as knots, stone and tramp material, enters the housing via the inlet 11.
- the cleaning combs 35 rotate around the circumferential surface of the drum 25 with the teeth 36 down in the slits 26, they keep these continuously open for the liquid and the fibres in the suspension which can pass through the slits 26 in the screening drum 25 and out through the outlet 15.
- the undesired particles are of such a size, however, that they cannot pass through the slits, and instead are cleaned away by the cleaning combs 35 and drop by force of gravity down through the outlet 12 for reject material and down into a vertical pipe-like collection container (not shown) .
- the container can be arranged with valves for discharging at suitable intervals. Alternatively, it can be arranged with a discharging arrangement of the revolving door type with compartments or cells.
- the slits 26 in the screening drum 25 are kept open longer, and a more even distribution of the accepted pulp is achieved. Since the passage area is thus kept greater, the drop in pressure is less and, consequently, the pump demands lower.
- the rotating cleaning combs also generate a "mixing" and movement in the housing which counteracts clogging, i.e. the function of the arrangement is less sensitive to variations in consistency and flow.
- the arrangement is completely closed and can therefore operate without admission of air and without any foaming resulting from admission of air, which could lead to operating disruptions.
- the arrangement according to the present invention is not limited to the embodiment which has been described, and that it can instead be modified within the scope of the patent claims which follow.
- the arrangement can. be provided with a plurality of cleaning combs, preferably in diametrically opposite pairs, so that an even loading of the drive shaft 20 is obtained.
- the cleaning combs 35 can be formed in a number of different ways, for example by welding the teeth onto a square rod.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- Engineering & Computer Science (AREA)
- Combined Means For Separation Of Solids (AREA)
- Paper (AREA)
- Control And Other Processes For Unpacking Of Materials (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
- Polishing Bodies And Polishing Tools (AREA)
- Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
- Centrifugal Separators (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Vehicle Body Suspensions (AREA)
Abstract
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8519717A JPH10510889A (en) | 1994-12-22 | 1995-12-14 | Separation device |
DE69512536T DE69512536T2 (en) | 1994-12-22 | 1995-12-14 | SEPARATING DEVICE |
BR9510213A BR9510213A (en) | 1994-12-22 | 1995-12-14 | Arrangement to separate unwanted particles from a suspension chain |
AU43203/96A AU4320396A (en) | 1994-12-22 | 1995-12-14 | Separating arrangement |
EP95941958A EP0799347B1 (en) | 1994-12-22 | 1995-12-14 | Separating arrangement |
US08/849,961 US5967335A (en) | 1994-12-22 | 1995-12-14 | Screening device for screening a suspension |
FI972598A FI118739B (en) | 1994-12-22 | 1997-06-18 | separation arrangements |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9404451-8 | 1994-12-22 | ||
SE9404451A SE503981C2 (en) | 1994-12-22 | 1994-12-22 | Apparatus for separating undesirable particles from a suspension stream |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1996019614A1 true WO1996019614A1 (en) | 1996-06-27 |
Family
ID=20396418
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1995/001505 WO1996019614A1 (en) | 1994-12-22 | 1995-12-14 | Separating arrangement |
Country Status (11)
Country | Link |
---|---|
US (1) | US5967335A (en) |
EP (1) | EP0799347B1 (en) |
JP (1) | JPH10510889A (en) |
AT (1) | ATE185175T1 (en) |
AU (1) | AU4320396A (en) |
BR (1) | BR9510213A (en) |
CA (1) | CA2207053A1 (en) |
DE (1) | DE69512536T2 (en) |
FI (1) | FI118739B (en) |
SE (1) | SE503981C2 (en) |
WO (1) | WO1996019614A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998031450A1 (en) * | 1997-01-17 | 1998-07-23 | Kvaerner Pulping Ab | Strainer arrangement for straining liquid from a mixing arrangement |
WO1999016963A1 (en) * | 1997-09-29 | 1999-04-08 | Antti Isola | Mechanically cleanable screen |
WO2019043296A1 (en) * | 2017-08-31 | 2019-03-07 | Andritz Oy | Separation device |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4048258B2 (en) * | 1998-02-03 | 2008-02-20 | 株式会社Ihi | Waste paper pulp sorting equipment |
CA2678839A1 (en) | 2009-09-14 | 2011-03-14 | Gea Houle Inc. | Separator with horizontal rotary screen |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4303508A (en) * | 1979-04-05 | 1981-12-01 | Kamyr Aktiebolag | Screening device |
WO1984004293A1 (en) * | 1983-04-29 | 1984-11-08 | Boerje Hellman | A device for purification of liquid media such as waste water |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2750499C3 (en) * | 1977-11-11 | 1982-02-04 | Hermann Finckh, Maschinenfabrik GmbH & Co, 7417 Pfullingen | Sorter for fiber suspension |
SU1286299A1 (en) * | 1985-03-26 | 1987-01-30 | Yuzefovich Anatolij Ya | Centrifugal classifier of lump materials |
SE463215B (en) * | 1989-02-22 | 1990-10-22 | Kamyr Ab | DEVICE FOR SULFING A SUSPENSION OF A FIBER CELLULOUS MATERIAL |
FI93979C (en) * | 1993-08-20 | 1995-06-26 | Tampella Oy Valmet | Method and pressure sorter for sorting pulp |
-
1994
- 1994-12-22 SE SE9404451A patent/SE503981C2/en not_active IP Right Cessation
-
1995
- 1995-12-14 BR BR9510213A patent/BR9510213A/en not_active IP Right Cessation
- 1995-12-14 CA CA002207053A patent/CA2207053A1/en not_active Abandoned
- 1995-12-14 AT AT95941958T patent/ATE185175T1/en not_active IP Right Cessation
- 1995-12-14 AU AU43203/96A patent/AU4320396A/en not_active Abandoned
- 1995-12-14 EP EP95941958A patent/EP0799347B1/en not_active Expired - Lifetime
- 1995-12-14 WO PCT/SE1995/001505 patent/WO1996019614A1/en active IP Right Grant
- 1995-12-14 DE DE69512536T patent/DE69512536T2/en not_active Expired - Fee Related
- 1995-12-14 US US08/849,961 patent/US5967335A/en not_active Expired - Fee Related
- 1995-12-14 JP JP8519717A patent/JPH10510889A/en active Pending
-
1997
- 1997-06-18 FI FI972598A patent/FI118739B/en active IP Right Grant
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4303508A (en) * | 1979-04-05 | 1981-12-01 | Kamyr Aktiebolag | Screening device |
WO1984004293A1 (en) * | 1983-04-29 | 1984-11-08 | Boerje Hellman | A device for purification of liquid media such as waste water |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998031450A1 (en) * | 1997-01-17 | 1998-07-23 | Kvaerner Pulping Ab | Strainer arrangement for straining liquid from a mixing arrangement |
WO1999016963A1 (en) * | 1997-09-29 | 1999-04-08 | Antti Isola | Mechanically cleanable screen |
US6312590B1 (en) | 1997-09-29 | 2001-11-06 | Antti Isola | Mechanically cleanable screen |
WO2019043296A1 (en) * | 2017-08-31 | 2019-03-07 | Andritz Oy | Separation device |
US11325160B2 (en) | 2017-08-31 | 2022-05-10 | Andritz Oy | Separation device |
Also Published As
Publication number | Publication date |
---|---|
CA2207053A1 (en) | 1996-06-27 |
JPH10510889A (en) | 1998-10-20 |
SE9404451L (en) | 1996-06-23 |
FI972598A (en) | 1997-06-18 |
EP0799347A1 (en) | 1997-10-08 |
DE69512536D1 (en) | 1999-11-04 |
FI972598A0 (en) | 1997-06-18 |
EP0799347B1 (en) | 1999-09-29 |
DE69512536T2 (en) | 2000-05-18 |
SE503981C2 (en) | 1996-10-14 |
FI118739B (en) | 2008-02-29 |
SE9404451D0 (en) | 1994-12-22 |
US5967335A (en) | 1999-10-19 |
BR9510213A (en) | 1997-11-04 |
ATE185175T1 (en) | 1999-10-15 |
AU4320396A (en) | 1996-07-10 |
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