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EP0643999A2 - Dispositif de tamisage - Google Patents

Dispositif de tamisage Download PDF

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Publication number
EP0643999A2
EP0643999A2 EP94113114A EP94113114A EP0643999A2 EP 0643999 A2 EP0643999 A2 EP 0643999A2 EP 94113114 A EP94113114 A EP 94113114A EP 94113114 A EP94113114 A EP 94113114A EP 0643999 A2 EP0643999 A2 EP 0643999A2
Authority
EP
European Patent Office
Prior art keywords
screen
main
screening device
screw conveyor
auxiliary
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.)
Granted
Application number
EP94113114A
Other languages
German (de)
English (en)
Other versions
EP0643999B1 (fr
EP0643999A3 (fr
Inventor
Wolfhard Rumpf
Werner Schwarzkopf
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.)
Reimelt Dietrich KG
Original Assignee
Reimelt Dietrich KG
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 Reimelt Dietrich KG filed Critical Reimelt Dietrich KG
Publication of EP0643999A2 publication Critical patent/EP0643999A2/fr
Publication of EP0643999A3 publication Critical patent/EP0643999A3/fr
Application granted granted Critical
Publication of EP0643999B1 publication Critical patent/EP0643999B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B07B1/18—Drum screens
    • B07B1/22—Revolving drums
    • 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

Definitions

  • the invention relates to a screening device with a housing, a main screen and a pre-screen, which carries a main beater for the main screen and is movable relative to the main screen.
  • this sieve By moving this sieve, for example by a vibration movement, or by moving the material over the sieve, for example through a beater, the part of the material to be sieved which has the necessary fineness is moved through the sieve. The foreign matter is retained by the sieve and can be removed.
  • US Pat. No. 4,202,759 has therefore specified a screening device of the type mentioned at the outset, which additionally has a prescreen.
  • the pre-screen also serves as a carrier for the beater mechanism, that is to say for the device which causes the material to be screened to move relative to the screen.
  • the pre-screen rotates at about 700 revolutions per minute, so that the passage of the material to be screened through the pre-screen is mainly caused by centrifugal force.
  • the pre-screen keeps larger foreign objects away from the main screen, but it tends to become clogged with clumping materials.
  • a tendency to lump can be observed in a large number of powdered or granular materials which are exposed to a certain amount of moisture. In many cases, an incorrectly set air humidity is sufficient to lead to the formation of clumps.
  • the clumping materials can no longer be removed by pure centrifugal force move through the pre-sieve, so that the pre-sieve will soon clog.
  • the invention has for its object to provide a screening device that can be used in a variety of ways.
  • a screening device of the type mentioned in that the prescreen is divided into a second and a first part, the second part carries the main racket and is movable relative to the first part and an auxiliary racket is provided which is movable relative to the first part .
  • the pre-screen By dividing the pre-screen, you can also equip the pre-screen with a beater, so that the material to be screened is pressed through the pre-screen under the influence of external forces.
  • the pre-screen namely its second, movable part
  • the pre-screen can still be used as a carrier for the main racket unit, so that a racket unit is also provided for the main screen, the support of which does not cause any major problems.
  • the centrifugal force In the second part of the pre-screen, only the centrifugal force is effective.
  • the first part of the pre-screen is equipped with a racket mechanism, namely the auxiliary racket mechanism, the capacity of the pre-screen is sufficient even for materials that tend to clump.
  • the aspect ratio of the first and second part of the pre-screen can be chosen as desired. You only have to make sure that the main racket is supported over a sufficient length so that it does not get into unwanted vibrations or is excessively loaded on the free part, so that it can break off.
  • the first part is arranged fixed to the housing.
  • the first part of the pre-screen is therefore stationary and immobile in the Housing arranged so that neither additional bearings nor additional sealing points are required here. Basically, no further bearings and seals are necessary compared to an undivided pre-screen. The bearing and sealing points are only moved further away from the housing wall, where they were previously located.
  • the second part and the auxiliary racket mechanism preferably have a common drive. No separate drive is therefore necessary for the auxiliary racket mechanism.
  • an essentially synchronous movement of the auxiliary beater mechanism and the second part of the pre-screen can hereby be set up, which automatically leads to the auxiliary beater mechanism and the main beater mechanism being moved essentially synchronously with one another.
  • the conveying capacity of the auxiliary and main racket mechanism can thus be adapted to one another in a very simple manner.
  • the main and pre-screen are preferably designed as cylinder drums, and the second part of the pre-screen rotates about a cylinder axis.
  • the first part of the pre-screen which is immobile, is arranged coaxially with the first part.
  • the rotation of the second part of the pre-screen can produce a continuous movement of the main beater unit relative to the main screen, while at the same time the second part of the pre-screen is moved relative to the material to be screened.
  • the drive is preferably formed by a shaft which extends from the input of the pre-screen to an input opening of the housing and is designed at least in sections as a screw conveyor device.
  • a screw conveyor device is not only to be understood as a screw conveyor which has a helically arranged projection on a shaft.
  • the screw conveyor device can also be formed by partial surfaces protruding from the shaft, which for example form an interrupted helical line. The only important thing is the material transport function, which is generated by the movement of the shaft. This rotational movement of the shaft then continues in the second part of the pre-screen. No separate drive device is required for driving the second part of the pre-screen and thus for driving the main racket mill.
  • the material to be screened is entered into the pre-screen and the drive of the pre-screen including the main racket is carried out simultaneously.
  • the screw conveyor preferably extends into the first part of the pre-screen and serves there as an auxiliary beater mechanism.
  • the relative movement between the first part of the pre-screen and the auxiliary beater takes place essentially axially, so that the material to be screened, which has not passed through the first part of the pre-screen, is removed directly from the first part of the pre-screen. This reliably prevents the first part of the pre-screen from clogging.
  • the first part is arranged in the conveying direction before the second part of the pre-screen.
  • the part of the material to be screened which has not been screened by the first part of the pre-screen can pass through the second part of the pre-screen. As a result, the screen surface of the pre-screen is better utilized.
  • the screw conveyor device has a greater conveying capacity at least in the area of the first part of the pre-screen than in the area of the inlet opening.
  • the material to be screened is accelerated in the area of the first part of the pre-screen.
  • the portion emerging from the first part of the pre-screen the material to be screened is thrown into the second part of the pre-screen, so to speak. This results in a better distribution of the material to be screened in the second part of the pre-screen.
  • the auxiliary racket mechanism has paddles which extend essentially in the axial and radial directions. These paddles can be provided alone. However, they can also be provided in addition to the screw conveyor-like design of the auxiliary beater mechanism. The paddles run essentially in the circumferential direction without communicating a major movement in the axial direction to the material to be screened. This shifts the center of gravity of the sieving action towards the first part of the pre-sieve. This can be particularly advantageous or important if the material to be screened is expected to clump more.
  • the main racket mechanism preferably has a stripping device for the outlet side of the first part of the pre-screen. Since the first part of the pre-screen is fixed, there is a risk that on the outlet side, i.e. in the case of a cylinder screen, material collects on the outer surface of the pre-screen, which prevents the passage of further screenings. This problem otherwise occurs in the upper area of the pre-screen, from which the screenings cannot fall due to gravity. The outlet side of the pre-screen is cleaned regularly by the stripping device, so that no blockages are built up here.
  • a gap is preferably provided between the second and the first part of the pre-screen, the width of which does not exceed the greatest width of a pre-screen opening.
  • the gap can therefore also serve as a sieve opening. It is so large that there is no blockage of the movement from the second to the first part of the pre-screen.
  • a screening device 1 has an input opening 3 in a housing 2, which opens into an input space 4.
  • a main screen 5 is also fixed and immovable.
  • the main sieve 5 consists, for example, of a sieve fabric 6 which is axially stretched by means of a tensioning device 7 and radially by means of tensioning rings 8.
  • the main screen 5 is designed as a hollow cylinder.
  • a pre-sieve 9 is arranged coaxially to the main sieve 5 and is separated into a second part 10 and a first part 11.
  • a gap 12 is formed between the two parts 10, 11, the width of which corresponds approximately to the greatest width of a pre-screen opening 13.
  • the second part 10 of the pre-screen 9 carries on its circumference holders 14 for a main racket 15.
  • the main racket 15 is adjacent to the main screen 5 and, as will be explained later, can be moved relative to the main screen 5.
  • the second part 10 of the pre-screen 9 is fastened via a star-shaped holder 16 to a shaft 17, which is in turn rotatably mounted in the housing 2 via bearings 20, 21.
  • the shaft 17 rotates
  • the second part 10 of the pre-screen 9 also rotates. This also moves the main racket 15 relative to the main screen 5 defined in the housing 2.
  • the first part 11 of the pre-screen 9 is mounted in the housing 2 in a stationary and immovable manner.
  • the first part 11 of the pre-screen 9 is also designed as a hollow cylinder which has the same diameter as the second part 10 of the pre-screen 9.
  • the first part 11 of the pre-screen continues a channel 18 which connects the first part 11 of the pre-screen 9 to the input space 4.
  • the channel 18 has the same inside diameter as the pre-sieve 9.
  • the pre-sieve diameter can also be chosen larger.
  • a screw conveyor 19 extends from the entrance space 4 into the interior of the first part 11 of the pre-screen 9.
  • the screw conveyor 19 is fixed on the shaft 17.
  • the shaft 17 which has a pulley 22 for driving at one of its ends, powdery or granular bulk material which enters the input space 4 via the input opening 3 is conveyed through the channel 18 into the first part with the aid of the screw conveyor 19 11 of the pre-screen 9 promoted.
  • the screw conveyor 19 inside the first part 11 of the pre-screen 9 acts as a beater, ie it produces a relative movement of the material to be screened in relation to the first part 11 of the pre-screen 9. This relative movement is essentially axially directed, but also has a small component in the circumferential direction.
  • Screening material that has not yet passed through the first part 11 of the pre-screen 9 is in the second part 10 of the pre-screen 9 rotating in synchronism with the screw conveyor 19 registered.
  • the centrifugal force generated by the rotation acts together with an at least initially existing relative movement between the screenings and the pre-screen in order to let the screenings pass through the second part 10 of the pre-screen 9.
  • Screened material that does not pass through the pre-screen falls at the rear end, ie at the end facing away from the screw conveyor 19, into a waste channel 23, into which the rest of the material that cannot pass through the main screen 5 also passes.
  • the material, on the other hand, which has passed through the pre-screen 9 and the main screen 5, falls into a collecting channel 24, from where it can be fed for further processing.
  • the screw conveyor 19 has, at least at the end that enters the pre-screen 9, a progressive delivery rate, which in the present exemplary embodiment is realized in that the thread pitch between individual turns of the screw conveyor 19 increases.
  • a progressive delivery rate which in the present exemplary embodiment is realized in that the thread pitch between individual turns of the screw conveyor 19 increases.
  • the material to be screened is spread somewhat better in the first part 11 of the pre-screen 9.
  • the screenings are thereby accelerated, so that they are practically thrown into the second part 10 of the pre-screen 9. This allows a better distribution of the material to be screened in the second part 10 of the pre-screen 9.
  • the main racket 15 extends over the entire length of the main screen 5. It therefore extends with part of its axial length also over the first part 11 of the pre-screen 9. In this area the main racket 15 is provided with wipers 25 pointing radially inwards clean the outlet side of the first part 11 of the pre-screen 9, ie remove material accumulations located there. This is particularly advantageous in areas of the first part 11 of the pre-screen 9 in which the material does not itself fall off the pre-screen 9 due to gravity.
  • the ratio of the axial lengths of the second and first part of the pre-screen 9 depends in principle only on which free length the main racket 15 can still tolerate. This free length determines the axial length of the first part 11 of the pre-screen 9. It may only be chosen so large that the main racket 15 does not cause any undesirable vibrations or is not overstressed during operation.
  • FIG. 2 and 3 show a modified embodiment, in which parts which correspond to those of FIG. 1 are provided with the same reference numerals.
  • Fig. 3 the main racket 15 with the wipers 25 and the clamping device 7 are not shown for reasons of clarity.
  • the embodiment according to FIGS. 2 and 3 differs on the one hand by the design of the screw conveyor.
  • the screw conveyor 19 is replaced here by individual partial surfaces 26 which are drawn entirely in the lower half of the shaft 17 and in section in the upper half. These partial surfaces 26 are fastened to the shaft 17 with screws 27. After loosening the screws 27, the inclination of the partial surfaces 26 and thus the conveying capacity of the screw conveyor can be adjusted.
  • auxiliary beater mechanism which in the embodiment according to FIG. 1 is formed by the part of the screw conveyor 19 protruding into the first part 11 of the pre-screen 9, is modified.
  • the auxiliary racket mechanism is now formed by paddles 28 which extend essentially in the axial and radial directions and are fastened to the shaft 17 by means of supports 29.
  • the movement which the paddles 28 perform when the shaft 17 is rotated is therefore an orbital movement.
  • the material to be screened is initially essentially the first Part 11 of the pre-screen is circulated before it enters the second part 10.
  • the embodiment of the auxiliary beater mechanism shown here can also be combined with a screw conveyor, so that the movement of the material to be screened will then be composed of a rotating component and an axial component.
  • the first part 11 of the pre-screen 9 is arranged in the conveying direction of the screenings before the second part 10 of the pre-screen 9, i.e. the screenings first run through the first part 11 and then through the second part 10 of the pre-screen. It can be achieved in this way that first the parts of the screenings which tend to clump and which tend to get stuck as soon as they come into contact with a screen are brushed through the pre-screen, while the loose parts in the second part 10 of the pre-screen 9 are screened out .

Landscapes

  • Combined Means For Separation Of Solids (AREA)
  • Centrifugal Separators (AREA)
  • Paper (AREA)
  • Processing Of Color Television Signals (AREA)
  • Medicines That Contain Protein Lipid Enzymes And Other Medicines (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
  • Eye Examination Apparatus (AREA)
  • Noodles (AREA)
EP94113114A 1993-09-18 1994-08-23 Dispositif de tamisage Expired - Lifetime EP0643999B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4331782 1993-09-18
DE4331782A DE4331782C1 (de) 1993-09-18 1993-09-18 Siebeinrichtung

Publications (3)

Publication Number Publication Date
EP0643999A2 true EP0643999A2 (fr) 1995-03-22
EP0643999A3 EP0643999A3 (fr) 1995-09-06
EP0643999B1 EP0643999B1 (fr) 1999-07-14

Family

ID=6498042

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94113114A Expired - Lifetime EP0643999B1 (fr) 1993-09-18 1994-08-23 Dispositif de tamisage

Country Status (4)

Country Link
US (1) US5570790A (fr)
EP (1) EP0643999B1 (fr)
AT (1) ATE182090T1 (fr)
DE (2) DE4331782C1 (fr)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19819866C1 (de) * 1998-05-04 1999-04-15 Reimelt Dietrich Kg Siebeinrichtung
US6360894B1 (en) 1999-08-31 2002-03-26 Finlay Hydrascreens Ltd. Double skin trommel
RU2200629C1 (ru) * 2001-10-18 2003-03-20 Государственное учреждение институт горного дела дальневосточного отделения РАН Грохот-дезинтегратор с интенсификацией кавитации комбинированным воздействием ультразвука
DE102005030041A1 (de) * 2005-06-27 2006-12-28 Ferdinand Doppstadt Siebvorrichtung für eine Siebmaschine
EP2052790B1 (fr) * 2006-05-10 2015-09-30 Tsukasa Co., Ltd. Crible
US8240481B2 (en) * 2006-05-10 2012-08-14 Tsukasa Co., Ltd. Sifter
GB2503233A (en) * 2012-06-19 2013-12-25 Kek Gardner Ltd Centrifugal sifting apparatus
CN102764729A (zh) * 2012-07-16 2012-11-07 江阴市龙昌机械制造有限公司 一种快拆式旋转筛粉机
JP6317265B2 (ja) * 2015-01-22 2018-04-25 株式会社大貴 分離装置、及び吸水処理材の製造方法
CA3014750C (fr) * 2015-02-23 2021-08-17 Fluid Quip, Inc. Appareil de criblage a pales multizone
US10993375B2 (en) 2018-06-19 2021-05-04 Ecomill, Llc Centrifugal scattering device
US10639645B2 (en) * 2018-06-19 2020-05-05 Ecomill, Llc Method for separating fine fractures and coarse fractures using a vacuum
CN110149830B (zh) * 2019-06-20 2021-09-24 安徽蓝鼎环保能源科技有限公司 一种多功能的土壤治理修复装置
DE102022004719A1 (de) * 2022-12-15 2024-06-20 Lig Gmbh Hydraulische Dichteabscheidevorrichtung

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1973864A (en) * 1931-09-05 1934-09-18 Biffar Andreas Centrifugal sieving machine
US3394808A (en) * 1966-01-03 1968-07-30 Andy L. Thompson Apparatus for separating granular materials
US3756406A (en) * 1970-07-14 1973-09-04 Us Agriculture Grain cleaner
US4115257A (en) * 1977-10-03 1978-09-19 Royal Industries, Inc. Grain cleaner
US4202759A (en) * 1978-11-24 1980-05-13 Prater Industries, Inc. Centrifugal screening apparatus
US4582202A (en) * 1982-09-30 1986-04-15 Kason Corporation Centrifugal sorting method
IT8321934U1 (it) * 1983-05-20 1984-11-20 Barbieri Adriano Macchina selezionatrice di prodotti granulari in genere
SU1258498A1 (ru) * 1985-03-25 1986-09-23 Всесоюзный Научно-Исследовательский Институт Резинотехнического Машиностроения Барабанный грохот
US5052874A (en) * 1990-04-12 1991-10-01 Jr Johanson, Inc. Compacting screw feeder
DE9209985U1 (de) * 1992-07-24 1992-09-17 Hahn Verfahrenstechnik GmbH, 6053 Obertshausen Siebvorrichtung für pulverförmige und granuläre Schüttgüter

Also Published As

Publication number Publication date
US5570790A (en) 1996-11-05
EP0643999B1 (fr) 1999-07-14
DE59408484D1 (de) 1999-08-19
EP0643999A3 (fr) 1995-09-06
DE4331782C1 (de) 1994-08-18
ATE182090T1 (de) 1999-07-15

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