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EP0332031B1 - Séparateur pneumatique à zigzag - Google Patents

Séparateur pneumatique à zigzag Download PDF

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Publication number
EP0332031B1
EP0332031B1 EP89103544A EP89103544A EP0332031B1 EP 0332031 B1 EP0332031 B1 EP 0332031B1 EP 89103544 A EP89103544 A EP 89103544A EP 89103544 A EP89103544 A EP 89103544A EP 0332031 B1 EP0332031 B1 EP 0332031B1
Authority
EP
European Patent Office
Prior art keywords
air
zigzag
sifting
ducts
channels
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
EP89103544A
Other languages
German (de)
English (en)
Other versions
EP0332031A2 (fr
EP0332031A3 (fr
Inventor
Hans Dr. Uhlemann
Heiko Dipl.-Ing. Herold
Reinhard Boeck
Hans Daun
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.)
Bayer AG
Original Assignee
Bayer AG
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 Bayer AG filed Critical Bayer AG
Publication of EP0332031A2 publication Critical patent/EP0332031A2/fr
Publication of EP0332031A3 publication Critical patent/EP0332031A3/fr
Application granted granted Critical
Publication of EP0332031B1 publication Critical patent/EP0332031B1/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
    • B07B4/00—Separating solids from solids by subjecting their mixture to gas currents
    • B07B4/02—Separating solids from solids by subjecting their mixture to gas currents while the mixtures fall
    • B07B4/04—Separating solids from solids by subjecting their mixture to gas currents while the mixtures fall in cascades

Definitions

  • the invention relates to a zigzag sifter with a multiplicity of fluidically connected, zigzag-shaped, compressed air-operated sifting air channels which are connected to a collecting channel under compressed air.
  • This classifier is a simple, vertical, smooth tube with a rectangular cross-section that is alternately inclined to the right and to the left at the same angle to the vertical.
  • the coarse portions of the feed slide down on the bottom wall of the channel. In doing so, they have to cross the visual air flow coming from below at the kinks. With each crossing there is a separation of fine parts, which in itself does not lead to a sharp classification. A multiple repetition can ultimately result in a very sharp separation of the fractions due to a multiplication effect.
  • a multi-channel zigzag sifter with sifting air ducts connected in parallel in terms of flow, which are connected to a gas distributor, is described in EP-A-163 836.
  • the construction principle of such a sifter package with many small channel cross-sections allows significantly lower overall heights with the same number of kinks.
  • the number of kinks for one and the same desired separation result can also be reduced because the thickness of the material layer to be sifted is so small that a significantly better viewing process takes place at the individual kinks.
  • CH-A-419 810 which has a group of sight tubes connected in parallel.
  • This is a sifter cascade, in which the material to be sifted is passed one after the other under the feet of the individual viewing channels and is introduced into the individual viewing channels from below using visual air in the form of one or more sharp beams.
  • the visible material on a conveyor belt is whirled up by the sharp line of sight air and blown into the sight pipes or sight channels.
  • an airbed classifier For the dedusting of granular material at high throughputs, an airbed classifier was also developed, which e.g. is described in DE 1 507 686.
  • This classifier combines a strongly fluidized fluidized bed with a system of parallel zigzag channels arranged above it. The feed bed moves through the fluidized bed in such a way that coarse material emerges from the bed at the end. The fine material is checked for its grain size in the zigzag channels and, if the size falls below a predetermined limit, is transferred from the classifying air to a separator. The coarse grain, on the other hand, falls back into bed.
  • multi-channel zigzag sifters are on the market, in which the material to be sifted is fed evenly to the channels via a distributor screw. The visible air flows in undosed to the parallel channels.
  • classifiers may only be operated with a low solids load.
  • the invention has for its object to take precautions in a multi-channel zigzag sifter of low height and high selectivity, which ensure that all channels are supplied evenly and constantly with sifting air regardless of the respective loading with solid matter.
  • the sifting air ducts each have an air distribution pipe for distributing the sifting air over the duct cross-sections and that in the individual air feeds branching off the collecting duct, sound restrictors with the same cross section are arranged, through which the sifting air flows at the speed of sound, so that in Each air distribution pipe receives an amount of air that is only determined by the cross section and the pressure in front of the sound throttle.
  • Sound restrictors are perforated screens through which the visible air flows at sound speeds in their working area.
  • a sound choke is therefore assigned to each viewing duct, so that all ducts have the same air throughput with the same cross section of the perforated screens. Since the parallel viewing channels are all fed from the same collecting channel, the pressure in the collecting channel can be used to vary the viewing air flow rate of all channels evenly.
  • the cross sections of the ducts are advantageously narrowed below the feed point for the classifying air in such a way that the coarse grain of the desired size can just fall freely out of the classifying duct. Due to the particles falling out, the narrowing of the cross-section is fluidically increased the more particles pass the constriction. However, this leads to the desired stabilization of the flow distribution.
  • the constriction is given the shape of a zigzag channel.
  • zigzag channels have a particularly high resistance coefficient, which even exceeds that of labyrinth seals.
  • a control device is provided in the zigzag sifter according to the invention which maintains such pressure in this space that no sifting air flows out of the channels downwards, but on the other hand also no air from the surroundings is sucked in by the ducts. This is achieved by a corresponding regulation for the extraction of the classifier exhaust air.
  • the zigzag sifter shown schematically in FIG. 1 consists of a housing 1 with a collecting space 2 for the discharged material with the desired grain size, the zigzag sifter package and the collecting duct 4 for supplying the sifting air.
  • the zigzag sifter package consists of a plurality of vertically arranged, fluidically parallel zigzag channels 5 with attached return shafts 6. Through the return shafts 6, the undersize may be thrown back into a material bed. They can have smooth or zigzag channel walls.
  • the classifying air is fed to the air distribution pipe via a diaphragm or throttle (sound throttle) 11 through which the speed of sound flows (see also description of FIG. 3).
  • labyrinths zigzag-shaped narrow points
  • the labyrinth 12 ultimately serves to improve the selectivity if a different solids loading is to be expected in the classifier channels 5 and different pressure distributions result from this.
  • the constrictions 12 counteract flow instabilities which result from such different pressure distributions.
  • the air supply to the air distribution pipes 9 can be seen from FIG. 3.
  • the sifting air flows for the channels 5 are branched off in parallel from the collecting channel 4.
  • throttles 11 Due to the arranged in the individual feeds to the air distribution pipes 9 throttles 11 ensures that in each air distribution pipe 9, regardless of the pressure behind the sound throttle, an amount of air flows that is determined only by the cross section and the pressure in front of the sound throttle. With the same cross section of the sound restrictors, the air throughput for all classifier channels is also the same.
  • the suction for the classifier exhaust air is provided with a control device which ensures that ambient pressure prevails in the collection space 2.
  • the goods viewed are discharged from the collecting space 2 through a rotary valve.

Landscapes

  • Combined Means For Separation Of Solids (AREA)
  • Separation By Low-Temperature Treatments (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)

Claims (5)

  1. Crible en zigzag avec un grand nombre de canaux (5) d'air de criblage branchés aérauliquement en parallèle, alimentés en air sous pression, en forme de zigzag, qui sont en communication avec un canal collecteur (4) maintenu sous pression d'air, caractérisé en ce que les canaux (5) d'air de criblage présentent chacun un tube (9) de distribution d'air pour la distribution de l'air de criblage sur la section transversale du canal, et en ce que des étranglements acoustiques (11) de même section transversale sont disposés dans les conduites individuelles d'amenée d'air se raccordant au canal collecteur (4), ces étranglements acoustiques étant traversés par l'air de criblage à la vitesse du son, de telle sorte que dans chaque tube de distribution d'air (9) pénètre un débit d'air qui est déterminé uniquement par la section transversale et la pression en avant de l'étranglement acoustique (11).
  2. Crible en zigzag selon la revendication 1, caractérisé en ce que les tubes de distribution d'air (9) sont perforés (10) à leur surface supérieure et inclinés dans la direction de traversée du tube d'un angle α = 5 à 60° par rapport à l'horizontale.
  3. Crible en zigzag selon la revendication 1 à 2, caractérisé en ce que les canaux (5) sont rétrécis (12) à leur extrémité inférieure, au voisinage de la sortie des grains grossiers.
  4. Crible en zigzag selon la revendication 3, caractérisé en ce que le rétrécissement (12) contient des parois de canal en forme de zigzag.
  5. Crible en zigzag selon la revendication 1 à 4, caractérisé en ce que l'aspiration pour l'extraction de l'air de criblage est dotée d'un dispositif de régulation qui maintient à l'extrémité inférieure des canaux et des rétrécissements une pression telle qu'en cet endroit l'air de criblage ne ressort pas, et que de l'air n'y est pas aspiré depuis l'environnement.
EP89103544A 1988-03-11 1989-03-01 Séparateur pneumatique à zigzag Expired - Lifetime EP0332031B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3808116A DE3808116A1 (de) 1988-03-11 1988-03-11 Zick-zack-sichter
DE3808116 1988-03-11

Publications (3)

Publication Number Publication Date
EP0332031A2 EP0332031A2 (fr) 1989-09-13
EP0332031A3 EP0332031A3 (fr) 1991-07-31
EP0332031B1 true EP0332031B1 (fr) 1994-01-26

Family

ID=6349469

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89103544A Expired - Lifetime EP0332031B1 (fr) 1988-03-11 1989-03-01 Séparateur pneumatique à zigzag

Country Status (4)

Country Link
US (1) US4931174A (fr)
EP (1) EP0332031B1 (fr)
JP (1) JP2753848B2 (fr)
DE (2) DE3808116A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5213820A (en) * 1984-02-27 1993-05-25 Bayer Aktiengesellschaft Process and device for fluidized bed spray granulation
DE4200821A1 (de) * 1992-01-15 1993-07-22 Bayer Ag Geschmacksmaskierte pharmazeutische mittel
DE4304405A1 (de) * 1993-02-15 1994-08-18 Bayer Ag Verfahren zur kontinuierlichen Wirbelschichtagglomeration
US6213307B1 (en) * 1995-11-15 2001-04-10 Grana Inc. Fluid-bed cleaner and grades sorter for particle form materials
DE59812057D1 (de) * 1997-04-09 2004-11-11 Symrise Gmbh & Co Kg Verfahren zur Herstellung alkoholhaltiger Granulate
CN1590249B (zh) * 2003-06-19 2010-09-29 豪尼机械制造股份公司 分配器装置中用于筛分产品流的筛选器
EP1958520A3 (fr) * 2007-02-09 2013-04-03 Symrise AG Granulés de lit fluidisé ayant une teneur élevée en fruit
DE102010007593A1 (de) * 2010-02-04 2011-08-04 Hauni Maschinenbau AG, 21033 Sichtmittel zum Sichten eines Produktstroms innerhalb einer Verteilervorrichtung
DE102013215062A1 (de) * 2013-07-31 2015-02-05 Krones Ag Zick-Zack-Sichter zum Separieren von Trenngut, beispielsweise Kunststoffflocken, und Verfahren zum Separieren von Trenngut, beispielsweise Kunststoffflocken, mittels eines Zick-Zack-Sichters
CN110074448B (zh) * 2019-06-19 2022-05-17 常德烟草机械有限责任公司 一种梗丝分选装置

Family Cites Families (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1861248A (en) * 1930-01-03 1932-05-31 Albert H Stebbins Air classifier
DE1135841B (de) * 1960-06-09 1962-09-06 Dr Theodor Eder Verfahren und Vorrichtung zum Trennen koernigen Gutes in wenigstens zwei Endfraktionen
DE1407846A1 (de) * 1961-06-15 1969-04-10 Alpine Ag Anwendung des Steigrohrwindsichters nach Patent 1270380 in der Getreidewirtschaft
DE1507686B1 (de) * 1966-04-06 1972-05-25 Alpine Ag Steigrohr-Windsichter
NL136425C (fr) * 1966-07-11
US3876419A (en) * 1970-07-06 1975-04-08 Lev Petrovich Brusov Method of thermal and chemical treatment of solids of starting material not over 0.5 mm in size
DE2341363C3 (de) * 1973-08-16 1979-05-31 Kali-Chemie Ag, 3000 Hannover Verfahren zur Herstellung eines Katalysators zur Zersetzung von Hydrazin und seinen Derivaten
US3925198A (en) * 1975-01-29 1975-12-09 Univ Utah Apparatus and method of air classifying municipal solid wastes
DE2641068A1 (de) * 1976-09-11 1978-03-16 Alpine Ag Steigrohrwindsichter zur entsandung von holzspaenen
DE2804548A1 (de) * 1978-02-03 1979-08-09 Krauss Maffei Ag Verfahren und vorrichtung zum trennen feuchten papiers von muell
US4235707A (en) * 1979-04-09 1980-11-25 Burke, Davoud & Associates Method and apparatus for treating solid municipal refuse and other cellulose containing material
JPS5616227U (fr) * 1979-07-11 1981-02-12
SU906633A1 (ru) * 1980-06-20 1982-02-23 Всесоюзный Научно-Исследовательский Институт Деревообрабатывающей Промышленности Устройство дл сортировки древесных частиц
SU1265002A1 (ru) * 1984-02-03 1986-10-23 Уральский политехнический институт им.С.М.Кирова Пневматический многоколонный классификатор
EP0163836B1 (fr) * 1984-04-07 1988-10-12 Bayer Ag Procédé et dispositif pour la production de granulés
SU1268212A1 (ru) * 1985-06-17 1986-11-07 Научно-исследовательский институт прикладной математики и механики при Томском государственном университете Воздушный сепаратор
AT386362B (de) * 1986-08-13 1988-08-10 Uralsky Politekhn Inst Schwerkraft-windsichter zum trennen von schuettstoffen
JPS6311067A (ja) * 1987-06-25 1988-01-18 Victor Co Of Japan Ltd 直流高電圧発生装置

Also Published As

Publication number Publication date
DE58906793D1 (de) 1994-03-10
JP2753848B2 (ja) 1998-05-20
DE3808116A1 (de) 1989-09-21
EP0332031A2 (fr) 1989-09-13
US4931174A (en) 1990-06-05
JPH01274880A (ja) 1989-11-02
EP0332031A3 (fr) 1991-07-31

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