EP0427679B1 - Dispositif de fractionnement de matières granuleuses - Google Patents

Dispositif de fractionnement de matières granuleuses Download PDF

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Publication number
EP0427679B1
EP0427679B1 EP90810848A EP90810848A EP0427679B1 EP 0427679 B1 EP0427679 B1 EP 0427679B1 EP 90810848 A EP90810848 A EP 90810848A EP 90810848 A EP90810848 A EP 90810848A EP 0427679 B1 EP0427679 B1 EP 0427679B1
Authority
EP
European Patent Office
Prior art keywords
plane
concentrator
air
stone
casing
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
EP90810848A
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German (de)
English (en)
Other versions
EP0427679A3 (fr
EP0427679A2 (fr
Inventor
Eberhard Dipl.-Ing. Funke
Eberhard Plee
Siegfried Dipl.-Ing. Voigt
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.)
WIRTH MUEHLENBAU DRESDEN GMBH
Original Assignee
Wirth Muehlenbau Dresden GmbH
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Publication date
Application filed by Wirth Muehlenbau Dresden GmbH filed Critical Wirth Muehlenbau Dresden GmbH
Publication of EP0427679A2 publication Critical patent/EP0427679A2/fr
Publication of EP0427679A3 publication Critical patent/EP0427679A3/fr
Application granted granted Critical
Publication of EP0427679B1 publication Critical patent/EP0427679B1/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
    • B07B9/00—Combinations of apparatus for screening or sifting or for separating solids from solids using gas currents; General arrangement of plant, e.g. flow sheets
    • B07B9/02—Combinations of similar or different apparatus for separating solids from solids using gas currents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B4/00—Separating by pneumatic tables or by pneumatic jigs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B4/00—Separating by pneumatic tables or by pneumatic jigs
    • B03B4/02—Separating by pneumatic tables or by pneumatic jigs using swinging or shaking tables
    • 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
    • B07B4/08—Separating solids from solids by subjecting their mixture to gas currents while the mixtures are supported by sieves, screens, or like mechanical elements

Definitions

  • the invention relates to a device for fractionating granular material with an inclined, oscillatingly movable concentrator level and an oscillatingly movable stone reading plane arranged below the same in a housing with an extraction hood having an air suction opening and with an air flow passing through the stone reading plane and the concentrator plane from bottom to top to form a fluidized bed of the granular material above the concentrator level, with a material inlet at the upper, upstream end of the concentrator level and a light fraction outlet at the lower, downstream end of the concentrator level and a stone outlet at the upper end of the stone selection level and a heavy fraction outlet at the lower end of the stone selection level, whereby in Connection to the material inlet to the concentrator level has a stratification area and a well-permeable diarrhea area between the stratification area and the light fraction outlet.
  • the invention is used to prepare granular goods for further processing, e.g. in mills.
  • the task of grain cleaning is to remove any contaminants (foreign matter, dirt, seeds, eaten grains, etc.) from the grain before it is ground. Traditionally, this is done in particular by sieving, sifting, stone selection and cell selection. Due to the relatively high mass flow, however, this does not always take place to the desired extent or a very high level of technical effort is required.
  • This solution is characterized by the use of one or two fluidized bed layers.
  • the grain is always separated into at least two fractions on the upper fluidized bed level, and stones are selected on the lower fluidized bed level.
  • the light fraction also called mixed fraction
  • the heavy fraction almost only contains stones from the foreign components that are read out on the lower fluidized bed level. If two fluidized bed levels are present, the same air flows through them successively, so that the air required is practically used twice.
  • the upper fluidized bed level is divided into two functionally different parts:
  • the first part ie the part from the inlet to about the middle of the level, is equipped with fine-mesh wire mesh or perforated sheet metal with small holes, which is only air in Is flowed through from bottom to top and no grain falls through.
  • stratification which is very important for grain separation, forms in the direction of flow.
  • the good, specifically heavy grain and the stones brought along accumulate.
  • Inferior, specifically lighter grain and organic admixtures accumulate in the upper part of the layer, e.g. seeds, chaff and straw parts.
  • the adjoining second part of this level is equipped with perforated plates, the openings of which are larger, usually a multiple than the individual grains of the grain to be separated.
  • This perforated plate does not have the function of a sieve, i.e. Separate by grain size, but acts as a flow mask.
  • the air flowing through from below should only allow the grains flowing on the underside of the grain material layer to fall through, and the stones to fall through without destroying the basic structure of the layering and its movement.
  • the air passage through the stone selection level in the area of the stone outlet is greater than on the side of the grain outlet.
  • the air requirement is rather reversed.
  • the air currents are therefore compensated for, ie the air does not flow vertically, but rather obliquely in the direction of inclination through the drop area of the concentrator level. The consequence of this is excessive acceleration and thus undesired mixing of the grain layer in this area.
  • the device described has the disadvantage, among other things, that the structure of the bulk fractions lying on top of one another is disturbed by swirling in the material separation device.
  • Another disadvantage is the inadequate controllability of the ratio of heavy goods to light goods.
  • the invention is therefore based on the object of improving a device of the type mentioned in such a way that a disturbance of the fluidized bed above the diarrhea area of the concentrator level is substantially avoided and thus mixing of the grain material in the layer flowing above the diarrhea area of the concentrator level is prevented.
  • the diarrhea region has a top plate and a bottom plate, vertically spaced apart, between which cross webs are formed for the purpose of swirling through openings in the top plate, and the bottom plate has outlet openings whose size corresponds at least to that of the openings in the top plate.
  • the specifically heavy grains When the specifically heavy grains have passed the first flow mask (top plate), they are slowed down by the air flow prevailing there. As a result of the transverse webs, they cannot flow off in the direction of inclination of the concentrator plane. The grains falling through are thus swirled before they pass through the second flow mask. The swirled grains and the crossbars create an even turbulent air flow through the first flow mask. There are therefore no air currents directed diagonally upwards grain layer flowing over the concentrator level. The basic stratification, i.e. specifically heavy components at the bottom and specifically light components at the top, is retained, whereby, as already mentioned, the specifically heavy grains fail.
  • the exemplary embodiment of the device for fractionating grain has a housing 2 which is suspended in an oscillatory manner and driven by an unbalance motor 1.
  • the unbalance motor 1 executes a directional oscillating movement.
  • a concentrator level 3 and, below that, a stone reading level 4 are arranged in the housing 2, but their inclination is adjustable.
  • a stone outlet 5 is located at the upper end of the stone selection level 4.
  • the concentrator level 3 is subdivided into a stratification area 6, which is covered with a fine vibrating sieve fabric (clear mesh size approx. 1 mm) and a diarrhea area 7, which with a perforated plate with a hole diameter of preferably 8 ... 12 mm (in grain wheat) as Top plate 8 and a perforated plate with a hole diameter of 9 ... 14 mm (for wheat as granular material) is fitted as the bottom plate 9.
  • the diarrhea area 7 is subdivided into compartments 10 below the top plate 8 transversely to the direction of flow of the grain material so that the transverse webs 11 each abut the ribs 12 of the top plate 8 and thus do not divide or partially close its through openings.
  • the crossbars 11 can be arranged after each row of holes or after several rows of holes in the top plate 8.
  • the distance between top plate 8 and bottom plate 9 should at least correspond to the grain size, but should not exceed a maximum of 10 times the grain size.
  • the crosspieces 11 can divide or partially hide the outlet openings of the lower plate 9.
  • the material inlet 13 for the grain is arranged at the upper end of the concentrator level 3 and the light fraction outlet 14 is arranged at the lower end of the diarrhea area 7 of the concentrator level 3.
  • the suction hood 15 extends over the entire length of the concentrator level 3. For better regulation of the working effect, the suction hood 15 is divided in the longitudinal direction into chambers 16 which have separate air controls 17. In addition, a throttle valve 18 is arranged in the air extraction 19 for regulating the total air flow.
  • Good inlet 13 and suction hood 15 do not vibrate in this embodiment and are connected to the housing 2 by an airtight flexible cloth 20.
  • the design can alternatively also be carried out in such a way that the product inlet 13 and the suction hood 15 are firmly connected to the housing 2 and resonate.
  • the subdivision of the suction hood 15 into several chambers 16 can be omitted in other versions, but usually a reduced one Work effect is the result.
  • the setup works as follows:
  • the grain material runs through the material inlet 13 into the machine and reaches the stratification area 8 of the concentrator level 3 uniformly, distributed over the entire width.
  • the air flowing through fluidizes the grain material, so that it flows off evenly in the direction of inclination of the concentrator level 3.
  • stratification takes place according to the density or floating speed of the constituents of the grain material.
  • Specifically heavy components are arranged on the underside, specifically light components are arranged on the top of the grain layer.
  • the grains swirled in the compartments 10 and the transverse webs 11 thereby have a very positive effect for a uniform turbulent air flow through the openings of the top plate 8.
  • Air currents directed obliquely upwards can no longer continue upwards due to the conditions below the concentrator level 3 and therefore no longer lead to a mixing of the grain layer flowing on the top plate 8, i.e. the basic stratification remains despite the diarrhea of specifically heavy grain.
  • the facility allows the quality of work at concentrator level 3 to be better regulated with the help of air regulation 17 of the individual chambers 16.
  • the air is then regulated by means of the main throttle valve 18.
  • the stone selection level 4 works according to the known principle: While the cereal grains, fluidized by the air flowing through them, flow in the direction of inclination through the heavy fraction outlet 21, the stones are counteracted by the directional oscillating movement of the stone selection level 4, which is covered with fine-meshed vibrating sieve fabric Steinauslauf 5 promoted. A higher air speed forms under the adjustable cover plate 22, so that grain grains carried up to there are blown in the direction of the heavy fraction outlet 21.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Glanulating (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Treatment Of Liquids With Adsorbents In General (AREA)

Claims (11)

  1. Dispositif de fractionnement de produit granuleux, avec un plan concentrateur (3) incliné, déplaçable de façon oscillatoire, ainsi qu'avec un plan épierreur (4), disposé au-dessous du plan concentrateur (3), déplaçable de façon oscillatoire, dans un carter (2) comportant un capot d'évacuation par aspiration (15), présentant une ouverture d'aspiration d'air (19), et avec un courant d'air, traversant de bas en haut le plan épierreur (4) et le plan concentrateur (3), en vue de constituer une couche fluidisée de produit granuleux au-dessus du plan concentrateur (3), avec une alimentation en produit (13) placée à l'extrémité supérieure, amont, du plan concentrateur (3) et une évacuation de fraction légère (14), placée à l'extrémité inférieure, aval, du plan concentrateur (3), ainsi qu'une évacuation de pierres (5), à l'extrémité supérieure du plan épierreur (4), et une évacuation de fraction lourde (21) à l'extrémité inférieure du plan épierreur (4), le plan concentrateur (3) présentant à la suite de l'alimentation en produit (13) une zone de formation de couche (6) et, entre la zone de formation de couche (6) et l'évacuation de fraction légère (14), une zone de chute (7), perméable au produit, caractérisé en ce que la zone de chute (7) présente, espacés en direction verticale, une tôle supérieure (8) ainsi qu'une tôle inférieure (9), entre lesquelles des compartiments (10) destinés à la fluidisation du produit sont formés au moyen de nervures transversales (11) laissant libres des ouvertures de passage de produit de la tôle supérieure (8), et en ce que la tôle inférieure (9) présente des ouvertures de sortie de produit dont la taille correspond au moins à celle des ouvertures de passage de produit ménagées dans la tôle supérieure (8).
  2. Dispositif selon la revendication 1, caractérisé en ce que la tôle supérieure (8) présente des rangées de trous décalées, constituant des ouvertures de passage de produit, et en ce que les nervures transversales (11), reliées, entre des rangées voisines, à la tôle supérieure (8), s'étendent en descendant de celle-ci, jusqu'à la tôle inférieure (9).
  3. Dispositif selon la revendication 1 ou 2, caractérisé en ce que l'espacement entre des nervures transversales (11) voisines correspond au maximum au décuple de l'espacement entre la tôle supérieure (8) et la tôle inférieure (9).
  4. Dispositif selon au moins l'une des revendications 1 à 3 précédentes, caractérisé en ce que les nervures transversales (11) sont disposées sensiblement perpendiculairement aux tôles supérieure (8) et inférieure (9).
  5. Dispositif selon au moins l'une des revendications 1 à 4 précédentes, caractérisé en ce que les inclinaisons du plan concentrateur (3) et du plan épierreur (4) sont réglables.
  6. Dispositif selon au moins l'une des revendications 1 à 5 précédentes, caractérisé en ce que le plan concentrateur (3) et le plan épierreur (4) sont reliés rigidement au carter (1) et le carter (2) peut être soumis à un entraînement oscillatoire.
  7. Dispositif selon au moins l'une des revendications 1 à 6 précédentes, caractérisé en ce que le capot d'évacuation par aspiration (15) et l'alimentation en produit (13) sont stationnaires et reliés au carter (2) au moyen d'un dispositif flexible (20).
  8. Dispositif selon au moins l'une des revendications 1 à 7 précédentes, caractérisé en ce que le capot d'évacuation par aspiration (15) et l'alimentation en produit (13) sont reliés rigidement au carter (2) pouvant être soumis à un entraînement oscillatoire.
  9. Dispositif selon au moins l'une des revendications 1 à 8 précédentes, caractérisé en ce que le carter (2) est suspendu de façon à pouvoir osciller et peut être entraîné au moyen d'un moteur à balourd.
  10. Dispositif selon au moins l'une des revendications 1 à 9 précédentes, caractérisé en ce que le capot d'évacuation par aspiration (15) s'étend sur la totalité du plan concentrateur (3) et un volet d'étranglement principal (18) est disposé dans l'ouverture d'aspiration d'air (19).
  11. Dispositif selon au moins l'une des revendications 1 à 10 précédentes, caractérisé en ce que le capot d'évacuation par aspiration (15) situé au-dessus du plan concentrateur (3) est subdivisé, en direction longitudinale, en chambres (16) et en ce que des dispositifs de régulation d'air séparés, en particulier des volets d'étranglement auxiliaires (17) disposés par paires, sont disposés dans ces chambres (16).
EP90810848A 1989-11-06 1990-11-06 Dispositif de fractionnement de matières granuleuses Expired - Lifetime EP0427679B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DD89334278A DD288762A5 (de) 1989-11-06 1989-11-06 Einrichtung zur trennung von koernigem gut
DD334278 1989-11-06

Publications (3)

Publication Number Publication Date
EP0427679A2 EP0427679A2 (fr) 1991-05-15
EP0427679A3 EP0427679A3 (fr) 1991-07-24
EP0427679B1 true EP0427679B1 (fr) 1994-06-15

Family

ID=5613578

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90810848A Expired - Lifetime EP0427679B1 (fr) 1989-11-06 1990-11-06 Dispositif de fractionnement de matières granuleuses

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EP (1) EP0427679B1 (fr)
AT (1) ATE107197T1 (fr)
DD (1) DD288762A5 (fr)
DE (1) DE59006134D1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4426502C2 (de) * 1994-07-27 1996-08-01 Noell Abfall & Energietech Schwingherd
EP0855941B1 (fr) * 1995-10-19 2000-01-19 OCRIM S.p.A. Dispositif et appareil de tri et de separation de particules dans un procede de broyage de cereales
DE102007045664B3 (de) * 2007-09-25 2009-03-19 Michael Meserle Verfahren und Vorrichtung zum Entfernen von Staub und/oder faserförmigen Beimengungen aus einem Kunststoffgranulat
CN105214956B (zh) * 2015-10-28 2017-06-30 中国矿业大学 一种浓相气固流化床干法分选系统及工艺
CN109772703A (zh) * 2018-12-25 2019-05-21 泰州市长江食品有限公司 一种环保高效除杂筛选芝麻原料系统

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2678131A (en) * 1950-07-17 1954-05-11 Robert F Dore Dry concentrator
CH547667A (de) * 1971-10-22 1974-04-11 Buehler Ag Geb Verfahren und vorrichtung zum anreichern durch sortieren und von angereicherten fraktionen koernigen gutes.
EP0162014B1 (fr) * 1984-05-08 1987-12-09 Bühler AG Dispositif et procédé de séparation de matières granuleuses
CH672440A5 (fr) * 1986-12-01 1989-11-30 Buehler Ag Geb

Also Published As

Publication number Publication date
DE59006134D1 (de) 1994-07-21
EP0427679A3 (fr) 1991-07-24
EP0427679A2 (fr) 1991-05-15
ATE107197T1 (de) 1994-07-15
DD288762A5 (de) 1991-04-11

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