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
  • B07B7/00—Selective separation of solid materials carried by, or dispersed in, gas currents
  • B07B7/08—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force
  • B07B7/083—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force generated by rotating vanes, discs, drums, or brushes

Definitions

• the invention relates to an air classifier for sifting granular material into three fractions according to the preamble of claim 1.
• a separator for sifting gromigem Good in at least three fractions which has a plurality of classifier wheels in a vertically arranged housing, which are nested concentrically and spaced from each other.
• the classifier wheels are successively flowed through by the classifying air and each classifier wheel is assigned its own output.
• the classifier wheels are separated in the housing and mounted independently drivable.
• the first sighting takes place in the first viewing stage on the outermost classifying wheel with the largest diameter, the fine and middle fractions being separated from the coarse fraction.
• the other fine fractions are obtained there exclusively from the fine and middle fraction obtained from the first stage of the analysis.
• the coarse fraction is therefore subject to only one level of vision. If you want to get a high quality coarse material, then an intensive screening of the coarse material is necessary.
• a sifter is used to produce a free of fines and thus dust-free coarse material fraction, which allows an intensive and nearly complete sighting of the feedstock, or coarse material.
• the air classifier from the German patent DE 40 40 890 C1 serves to divide the feedstock with an optimized visual efficiency in at least three streams of different particle size distribution. It has two concentric nested classifier wheels whose rotor blade rings have a large axial height. By this arrangement it is achieved that the feed material lingers over a long distance away in the viewing zone and thus largely all fine and medium can be separated. Here, too, the other fine fractions are obtained exclusively from the fine and middle fraction obtained from the first stage of the view. A second indulgence of the coarse material does not take place.
• centrifugal force separator which has a substantially cuboidal housing in which a plurality of separately driven sifter rotors are arranged and which are each connected to a separate classifying air fine-material outlet.
• the feed material can be successively offered to several classifying rotors, so that a repeated sighting of the coarse fraction is possible.
• the classifying rotors are arranged at a relatively small distance from one another and always next to one another, the classifying rotors influence one another.
• Such a sifter is used to view granular material in at least three fractions and consists of a substantially vertically arranged housing with discharges for the fine, medium and coarse material, each sifter rotor its own line for the reformulationzu exit and a separate line for the reformulationab arrangement having.
• the DE 39 24 826 A1 provides, in the transition region from the first stage of view to the second, underlying level of view, a circulation and loosening of the material to be sighted achieve in that the transition region is funnel-shaped.
• Gutschwuderhoffl or Gutschleuderinnaten are mounted in this funnel-shaped transition region to achieve a deagglomeration and / or crushing of the goods.
• the object of the invention is therefore to provide an air classifier for sifting granular material in three fractions, which allows a very sharp separation of each fraction in a housing. There are more Tasks to achieve the sharp separation, that the prepare for a product for a product.
• the starting point of the invention is a sifter with two motor-driven paddle wheel sifter rotors mounted on one side, each having a tangential view air supply arranged at the level of each sifter rotor and having a stationary vane ring which is arranged at a radial distance from the circumference of the sifter rotor ,
• the safe includes at least one withdrawgutzu Entry and Austragsorgane for the fine, medium and coarse material. The viewing zone is flowed through by the bombardgut in the direction of the axial extent of the classifier rotors.
• classifier rotors which each have a closed cover disk at their axial first end and the fine or medium product discharge member at their axial second end.
• the classifier rotors are arranged in the common housing so that the two first ends of the classifier rotors are arranged face-to-face.
• the result is a free flow gap between the two viewing stages, which is bounded by an upper and a lower rotating wall. Due to the roughness of the cover plates results in a wall adhesion of the adjacent air layers. Since the delimiting walls represent and rotate the shrouds of the classifier rotors, the rotation is partially transferred to the adjacent air layers. Due to the resulting centrifugal forces The near-surface air layers are thrown radially outward. These air layers close to the edge leave the gap and intersect the stream of visible material, preferably in a direction of flow perpendicular to the stream of visual goods. This stream of air, which crosses the stream of visible material, swirls the visible material between the two stages of vision and disperses it.
• This turbulence is supported by an air flow directed inwards into the flow gap in the middle radial region of the flow gap.
• the layer air volume which was thrown off near the wall and withdrawn from the flow gap, must be replaced by an air volume of the same size. This is done by suction of classifying air from the region of the viewing zone in a central radial region of the flow gap. In this case, particularly fine particles are preferably transported into the flow gap.
• the axial height should be at least 5 times the value of the largest particle diameter to be observed.
• a variation of the possible penetration depth of the fine particles in radially inwardly pointing direction into the flow gap can be done by changing the maximum radial depth of the flow gap.
• the turbulence can be reduced by the supply of additional air at the radially inner end of the flow gap, since only a small amount of air from the viewing zone in the region of the dispersion inwards into the flow gap due to the additionally supplied air volume is sucked.
• the entire housing construction is designed to be particularly accessible, which allows easy and quick cleaning of the classifier. This minimizes downtime and therefore costs.
• the two classifier rotors are therefore in the preferred embodiment each equipped with independent bearings and / or drives When using only one drive, the torque is transmitted to both classifier rotors via a transmission or a clutch.
• the classifier rotors are connected at their end cover plates by a rigid coupling, which also serves as a means for limiting the radial depth of the flow gap.
• the housing is designed as a divisible in the plane of the flow gap housing.
• the two housing halves are designed either hinged or axially displaceable, with a combination is useful in which one half of the housing is first separated by axial displacement of the other housing half and in a further step, the separate housing half can be folded down.
• the hinged and / or slidable design makes the sifter rotors and interior of the housing easily accessible for inspection and cleaning.
• a coaxially extending to this task feed manifold is provided in an annular channel above the sifter, in which the preparefory feed manifold is evenly distributed over the circumference, before it enters the viewing zone.
• For distribution serve rotating internals, which are fastened in the preferred embodiment of the rotating sifter rotor.
• the material to be separated is neither crushed nor can agglomerations occur.
• the annular disc can be provided on its upper cover surface with blade elements, which cause an additional centrifugal effect on the preparegutpizate. It can thus be achieved with an additional resolution of agglomerates.
• the feed material distributor can be used in the same way also in air classifiers with only one classifier rotor.
• the task can also be arranged in an angular arrangement, preferably an arrangement having a direction component tangential to the direction of rotation of the sifter rotor.
• tangential arrangements which run at right angles to the axis of the sifter rotor, as opposed to the direction of rotation of the feed disburser by a speed component of the material to be viewed more intensive dispersion and with a same direction of rotation for the feed disposition a gentler dispersion takes place.
• the air classifier 1 shown in Fig. 1a consists of a divisible and hinged over the hinge 2 housing with an upper half of the housing 3 and a lower housing half 4, the two classifier rotors 5 and 9 record.
• the first classifier rotor 5 is rotatably received in the upper housing half 3 with a drive shaft 7 in the bearing 6 .
• the drive of the classifier rotor 5 is effected by a drive motor 8, which is connected via the drive shaft 7 with the classifier rotor 5.
• the second sifter rotor 9 is rotatably received in the storage 11 in the same way with its own drive shaft 10 .
• the drive of the classifier rotor 9 is effected by a drive motor 12 , which is connected via the drive shaft 10 to the classifier rotor 9 .
• Each classifier rotor 5 and 9 is a single-sided classifier rotor, whose drive shafts 7 and 10 , the fines discharge chambers 13 and 14 , and the classifier rotor bearings 6 and 11 are arranged on the same side. On the respective opposite side, the classifier rotors 5 and 9 have a closed cover disk 15 and 16 .
• a connecting piece 17 is arranged over which the material to be sighted will be dispensed at one point of the peripheral area.
• An outlet nozzle 18 for the coarse material is arranged below the lower sifter rotor 9 , the supply of the classifying air takes place at the radial circumferences of the classifier rotors 5 and 9 via the two tangential reformulationzu Replacementen 19 and 20th
• the classifier rotors 5 and 9 are arranged mirror-inverted in the air classifier 1 so that the two cover plates 15 and 16 are at a distance and in parallel planes to each other.
• the arrangement of the cover plates 15 and 16 a gap is formed, which is shown enlarged in Fig. 1b as a detail.
• Fig. 1b shows sortgutpiety falling on the outer circumference of the two classifying rotors 5 and 9 down along. Due to the rotation of the two classifier rotors 5 and 9 and their rotating shrouds 15 and 16 , the air in the flow gap is thrown near the wall of the rotating shrouds 15 and 16 to the outside, where she entrained preparegutpiety and into the middle of the flow gap into the gap and carries dispersed.
• Fig. 2 shows an opening sequence of the divisible housing by unfolding.
• Fig. 3 shows an opening sequence by moving and unfolding.
• the classifier rotors can be pulled up and removed from the housing by simply releasing them from the drive shafts. Since the entire housing construction has largely no undercuts, thus a quick and easy cleaning is guaranteed.
• the upper classifier rotor 5 is not equipped with its own drive motor.
• the classifier rotor 5 is connected to the driven classifying rotor 9 via a coupling 21 located on the cover disks 15 and 16 .
• Fig. 5 the arrangement of the nozzle 17 for the task of the visible material and the outlet nozzle 18 is shown for the discharge of coarse material, as it makes sense for the operation of the air classifier 1 in an axially horizontal alignment.
• Fig. 6 shows theoptiongutverteiler 22 with the internals for distribution and dispersion of the visible material.
• annular disc 24 is coaxially and rotationally connected to the classifying rotor 5 .
• Theitgutverteiler the paragraph 25 is assigned to the wall of the housing.
• the evenly distributed over the circumference of the annular disc 24 blade elements 26 are mounted below the annular disc 24 .
• additional blade elements 27 may be mounted above the rotating annular disc 24 .

Landscapes

• Combined Means For Separation Of Solids (AREA)
• Solid-Sorbent Or Filter-Aiding Compositions (AREA)
• Separation Of Gases By Adsorption (AREA)

Applications Claiming Priority (2)

Publications (3)

Family

ID=7889284

Family Applications (1)

Country Status (6)

Families Citing this family (6)

Family Cites Families (18)

• 1998
  • 1998-11-27 DE DE19854855A patent/DE19854855C2/de not_active Expired - Fee Related
• 1999
  • 1999-11-18 EP EP99123117A patent/EP1004366B1/de not_active Expired - Lifetime
  • 1999-11-18 DE DE59909319T patent/DE59909319D1/de not_active Expired - Lifetime
  • 1999-11-18 ES ES99123117T patent/ES2219982T3/es not_active Expired - Lifetime
  • 1999-11-18 AT AT99123117T patent/ATE265279T1/de active
  • 1999-11-23 US US09/447,862 patent/US6318561B1/en not_active Expired - Lifetime
  • 1999-11-29 JP JP33839399A patent/JP4791618B2/ja not_active Expired - Lifetime

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