EP3691799A2

EP3691799A2 - Filter device

Info

Publication number: EP3691799A2
Application number: EP18799763.0A
Authority: EP
Inventors: Jochen Thies; Adrian KAPE; Heinz Pritzke
Original assignee: Glatt Maschinen- und Apparatebau AG
Current assignee: Glatt Maschinen- und Apparatebau AG
Priority date: 2017-12-01
Filing date: 2018-11-07
Publication date: 2020-08-12
Also published as: CN111565858A; CA3082710A1; WO2019105700A2; JP2021504126A; US11642700B2; DE102017221731A1; US20200316647A1; JP7160918B2; WO2019105700A3

Abstract

The invention relates to a filter device (104, 204, 304) for filtering granules, in particular moist and/or dry granules, comprising a filter housing (108, 208, 308) having a base (119, 219, 319), a cover (106, 206, 306) and a side wall (107, 207, 307), an inlet for the granulate arranged on the filter housing, an outlet (110, 210, 310) for the sieved granulate arranged on the filter housing (108, 208, 308), a sieve (111, 211, 311) arranged in the sieve housing (108, 208, 308) and an inlet (116, 216, 316) for transfer air, wherein the outlet (110, 210, 310) for the sieved granulate, which is arranged on the sieve housing (108, 208, 308) is arranged on the side wall (107, 207, 307) of the sieve housing (108, 208, 308)

Description

screening device

The invention relates to a screening device for the screening of granules, in particular moist and / or dry Granu lat, comprising a bottom, a lid and a side wall having Siebgehäuse, a sieve housing angeordne- te inlet opening for the granules, one on the screen housing to parent Outlet opening for the sieved granules, arranged in a sieve housing sieve and an inlet opening for transfer air.

Sieve devices for granules, in particular for a wet granulation process or a drying process in a fluidizing apparatus downstream screening process, have long been state of the art. The known screening devices are filled via a arranged on the lid of the screening device inlet opening for the granules and emptied via a arranged in the bottom of the screening device for a suction shoe outlet opening after the screening process. In this case he follows the transport of the granules from the inlet opening to the outlet opening, for example, via a Schwerkraftbe schickung or via a pneumatic conveying. Disadvantageous to those known from the prior art

Sieve devices for granules, in which the z. B. moist granules is to be transferred to a dryer is that these screening devices have a large height or require and thus a spatial possibility for the realization of a equipped with a known sieve ver procedural system must be given. In addition, in the known screening devices disadvantageous that significantly limited by the at least partially conical shape of the suction shoe of the screen housing of the known screening device by Anhaf lines or deposits of granules in the conical shaped th area (suction shoe) of the screen housing the product transfer to sieved granules becomes. The object of the invention is to provide bereitzu a screening device, which while minimizing the buildup or deposits of granules on the screen housing requires a lower height and thus eliminates the disadvantages of the prior art. This object is achieved in a screening device of the type mentioned ge in that the screen housing angeord designated outlet opening for the sieved granules (product) is arranged in the side wall of the screen housing. Advantageously, the required overall height of the sieve device is thereby significantly reduced, as a result of which installation in existing systems, for example process plants, is made simpler. The height is significantly reduced, for example, by eliminating the need for the prior art koni's area below the screen, which is also referred to as suction shoe. As a result, an adhesion or deposition of granules in the screen housing, in particular special but in the region of the outlet opening of the screened granules is prevented, whereby a sufficiently fast and sufficiently good per product transfer to screened granules is always possible during the entire operation. Due to the compact construction according to the invention, on the one hand, the required saved the height of the screening device due to the omission of the suction shoe and at the same time in addition the product-contacting inner surface of the screen housing verrin siege. Particularly preferably, the Siebvorrich invention device for screening wet and / or dry granules, be particularly preferably for a wet granulation process or a drying process in a fluidizing apparatus, for example in a fluidized bed or the like. , followed by a sieving process.

The screen housing has, in an advantageous embodiment, a cylindrical shape, wherein the side wall of the screen housing is at least partially conical. By such a geometric configuration of the screening device is further u. a. Saves space, whereby the erfindungsge Permitted screening device is even better integrated into already existing Anla gene.

In particular, it has been found that particularly preferably arranged on the screen housing outlet opening for the sieved granules (product) is arranged tangentially to the side wall of the Siebge housing. Due to the tangential arrangement of the outlet opening for the granules on the side wall of the screen housing an optimized discharge of the screened Granu lats is achieved. In addition, attachments or deposits in the region of the outlet opening are minimized by the tangential arrangement and ensures a fast and unproblematic transport of the screened granules.

The outlet opening for the sieved granules is arranged in a BE preferred embodiment above the inlet opening for transfer air. Due to the tangential flow tion / movement of the transfer air in the screen housing, the centrifugal forces act on the granulate and drive or transport it upwards. This makes it advantageous to arrange the outlet opening for the sieved granules (product) above the inlet opening for the transfer air.

In addition, the screening device is preferably designed such that the screen arranged in the screen accordingly the design of the screen housing is formed. As a result, the product-contacting inner surface of the screen housing is reduced, d. H. the possible places for attachments or deposits in the screen housing are mined, so that a quick and easy transport of the sieved Gra is guaranteed.

In a particular embodiment of the sieve device according to the invention, the sieve device has a grinding body arranged in particular in the sieve housing. The advantage of a grinding body arranged in the sieve housing is that through this the granules can be pressed through the sieve improved. By the grinding media so the screening process is optimized.

In a preferred embodiment of the screening device of the sieve housing arranged in the grinding medium is arranged above the sieve. The arranged in the screen housing grinding body is rotatably arranged, more preferably, the grinding body via a motor, in particular an electric motor or the like. , drivable. This further optimizes the screening process.

The arranged in the sieve housing grinding media is particularly preferably be formed according to the design of the sieve. This adaptation of the grinding media to the shape of the sieve improves carrying out the screening process to a significant extent, since the granules to be screened by means of the adapted to the shape of the screen grinding body is pressed under a continuous and constant pressure through the screen.

In an additional preferred embodiment of the inventions to the invention Siebvorrichtung, the screening device has an inlet opening for transfer air, wherein the inlet opening for transfer air preferably on the side wall of Siebge housing, particularly preferably tangentially to the side wall of the screen housing, is arranged. As transfer air are gaseous media, preferably air but also inert gases, be distinguished. The supply of transfer air improves the product transport. In addition, an air flow is generated in the screen housing Siebvor direction, the deposits or deposits from granules on the inner surface of the Siebge housing minimized or completely prevented. In particular, before preferably lateral, but particularly preferably tangential to order the inlet opening for transfer air produces very good flow conditions of the transfer air in the screen housing to prevent the buildup or deposits of granules and in relation to the granules through the outlet opening.

According to a further preferred embodiment of the inventive sieve sieve device, the sieve on a rotor disc, which is arranged in particular between the sieve housing to parent sieve and the bottom of the sieve housing and is particularly preferably formed at least partially cone-shaped. The advantage of a rotor disk arranged between sieve and bottom in the sieve housing is that it serves to protect the seal below the sieve and to prevent product on the bottom, ie on the bottom horizontal plane of the screen housing, remains lying, is a rotor disk.

Particularly preferably, the rotor disk is arranged on a shaft which can be driven by a motor, thereby ensuring an improved transfer of the screened granulate.

The invention will be explained in more detail with reference to the accompanying drawing tion. In this show:

1 shows a simple schematic representation of a prin zipiellen structure of a known from the prior art granulation line with a Siebvorrich device at the outlet of a high-shear granulator,

Figure 2 is a cross-sectional detail view of one of

Prior art known screening device according to section A of Fig. 1,

3 shows a cross-section of a first embodiment of a screening device according to the invention with a laterally arranged on the screen housing Austrittsöff opening for the granules and a laterally on Siebge housing arranged inlet opening for transfer air,

Figure 4 is a cross section of a second Ausführungsbei

Game of a screening device according to the invention with a rotor disk arranged in the screen housing and a side opening arranged on the screen housing from the outlet opening for the granules according to sectional plane X-X in Fig. 5,

Figure 5 is a plan view of the second embodiment of the screening device according to the invention with a arranged laterally on the screen housing Austrittsöff tion for the granules and a laterally on Siebge housing arranged inlet opening for transfer air,

Figure 6 is a cross-sectional view of a schematic representation of a high-shear granulator with it arrange ter inventive Siebvorrichtung, and

Figure 7 is a plan view of the shown in Fig. 5 schematically table representation of a high-shear

Granulator arranged Siebvor invention according to direction.

In Fig. 1 is a simple schematic representation egg nes principal structure of a prior art be known granulation line 1 is shown. In order, for example, to transfer the moist granules from a high-shear granulator 2 into a dryer 3, a transfer of the granules is necessary. This transfer is currently realized either via a gravity feed of the dryer 3 or via a pneumatic table promotion. In the case of gravitational loading, the granules fall through the own mass driven into the dryer 3. However, this type of feed requires a large height and the spatial possibility of Reali tion of the granulation line 1. In the granulation line 1 shown in Fig. 1 is between the High-shear granulator 2 and the dryer 3 a screening device 4 at the outlet of the high shear granulator 2 shown. The exit of Siebvor device 4 is connected to the dryer 3 via a flexible

Hose line 5 connected.

Fig. 2 shows a cross section of a detail view of a known from the prior art screening device 4 according to section A of Fig. 1 for performing a screening operation of Granules, in particular for a wet granulation process or a drying process in a fluidized bed downstream screening process.

The sieve device 4 comprises a cover 6 and a side wall 7 exhibiting Siebgehäuse 8. The screen housing 8 also has an additional housing 6 in the lid 6 arranged Siebge inlet 9 for the granules and arranged on the screen housing 8 outlet opening 10. In the sieve housing 8, a sieve 11 for sieving the granules is arranged so that the granules entering via the inlet opening 9 are completely taken up by the sieve 11. In the screen housing 8 the screen 11 is also assigned to a shaft 12 via a motor M in the direction of arrow 13 rotatably driven ner grinding media 14. In order to ensure the transfer of the granules, for example, in a dryer 3 after sieving is above and below the screen 11 of the Siebvor device 4 via inlet openings transfer air supplied. The supply of transfer air to the screening device 4 is realized above the screen 11 via a first inlet opening 15 arranged in the cover 6 and via a second inlet opening 16 arranged after the screen 11.

The granules, which is emptied into the screening device 4 via the inlet opening 9 arranged in the cover 6, are pressed through the mesh of the screen 11 by the rotating grinding element 14. At the beginning of the emptying of the granules of the imple mentation from upstream High-shear granulator 2, most of the granules at one time in the sieve 11 of the sieve device 4 is emptied. This occurs before and after the filter housing 8 arranged in the screen 11 is often used to block the inlet opening 9 and the outlet opening 10 of the sieve device 4. The blockages arise, for example due to adhesions or deposits of granules on the surface of granules touched by granules 17 Siebge housing 8, preferably in the conically shaped portion 18 of the screen housing 8, since the conically shaped portion 18 which is present for the granules passage area of Siebgehäu ses 8 towards the Outlet opening 10 of the screen housing 8 greatly reduced. For example, in real applications, the diameter of the screen housing 4 is reduced from 400 mm to a diameter of the outlet opening 10 of 100 mm. Furthermore, formed in the known from the prior art design of the screening device 4 mostly rounded chunks of granules that can not be transported through the wire 11 and thus remain as a loss in the sieve 11.

FIG. 3 shows a cross section of a first embodiment of a screening device 104 according to the invention with an outlet opening 110 arranged laterally on the screen housing 108 for the granules to be screened and an inlet opening 116 for transfer air arranged laterally on the Siebgehäu 108. The sieve device 104 according to the invention for carrying out a sieving process of granules, in particular for egg nem Naßgranulationsprozess or a drying process in a fluidized bed downstream screening, according to the first embodiment comprises a bottom 119, a lid 106 and a side wall 107 exhibiting Siebgehäuse 108. In addition the sieve 104 a Siebge housing 108 arranged inlet opening 109, a Siebge housing 108 arranged outlet opening 110, a Siebhöäu se 108 arranged sieve 111 and a sieve housing 108 to ordered grinding media 114, wherein the sieve housing 108 arranged outlet opening 110 in the one-piece executed th side wall 107 of the screen housing 108, particularly preferably tangentially to the side wall 107 of the screen housing 108, is arranged. While the product flow was carried out from top to bottom according to the screening device known in the state of the art, in the novel geometry of the sieve device 104 the sieved granules are sucked through the exit wall 110 arranged on the side wall 107 of the sieve housing 108.

In the embodiment of FIG. 3, the screen housing 108 has a cylindrical, conical over its entire height H, ver from the lid 106 to the bottom 118 of the screen housing 108 tapered design. Other configurations of the design are conceivable. The side wall 107 is designed in the first embodiment in one piece as a conically shaped side wall 107. However, the side wall 107 can also be made in several parts, ie comprising at least two side wall sections. In addition to the multiple inlet openings 109 and outlet openings 110 may be disposed on the screen housing 108. The number, position and / or geometry of the inlet openings 109 is variable. With respect to the outlet openings 110, at least the number and / or the geometry is variable. The position of the outlet openings 110 is limited at least to the extent that at least one of the outlet openings 110 is arranged laterally on the screen housing 108. The screening device 104 shown in Fig. 3 also includes egg nen on a, preferably via a motor M, particularly preferably be an electric motor or the like. , in the direction of arrow 113 rotatably driven shaft 112 mounted grinding media 114. The grinding media 114 is the screen 111 in its shape fits, so that the granules improved under continuously constant pressure from the grinding media 114 through the mesh of the sieve 111 is pressable. For an additionally improved transfer of the granules to be screened through the sieve device 111 having the sieve 111, the sieve device 104 is supplied with transfer air via the inlet opening 116. In the exemplary embodiment, an inlet opening 116 is arranged on the side wall 107 of the screen housing 108. The inlet opening 116 can also be made variable in terms of number, position and / or geometry. Preferably, the inlet opening of the transfer air 116 below the outlet opening 110 for the sieved granules (product), ie exactly opposite as shown in Fig. 3 Darge, laterally arranged on the screen housing 108. As a result of the tangential movement of the air, the centrifugal forces act on the granulate and drive it upwards in the direction of the outlet opening 110, which is preferably arranged above the inlet opening of the transfer air 116.

The geometry of the screen housing 108, screen 111 and / or Mahlkör by 114 are preferably, as also performed in the first Ausführungsbei game, matched to optimize the screening process on. By matching the different geometries to one another, in addition to a reduction of the overall height by dispensing with an additional suction shoe, the inner free surface of the screening device, in particular of the sieve housing, is also minimized.

In the first exemplary embodiment shown in FIG. 3, the granules enter the screening device 104 via the inlet opening 109. Due to the coordinated geometries of sieve housing 108, sieve 111 and grinding media 114, we nige buildup or deposits, since the currency from the granules currency end of the sieving process touched inner surface 117 is minimal. In addition, formed in the circumferential direction of Siebgehäu ses 108 less Granulatanhaftungen or deposits or are transported faster via the outlet opening 110, since optimized flow conditions can be produced in the screen housing 108 by the transfer air flowing in laterally via the inlet opening 116 in conjunction with the minimum inner surfaces 117 being stirred. The sieved Gra nulat is sucked through the arranged on the side wall 107 of the screen housing 108 outlet opening 110.

4 shows a cross section of a second Ausführungsbei play a screening device 204 according to the invention with a arranged in the screen housing 208 rotor disk 220 and a side of the screen housing 208 arranged outlet opening 210 for the granules according to sectional plane X-X in Fig. 5th

Also, the second embodiment according to the invention comprises as well as the first embodiment, a bottom 219, a cover 206 and a side wall 207 having Siebge housing 208. The screening device 204 additionally has ei ne arranged on the screen housing 208 inlet opening 209 for the granules, one on the screen housing 208th arranged outlet opening 210 for the sieved granulate (product), arranged in the screen housing 208 sieve 211 and in the screen housing 208 to the sieve 211 associated Mahlkörper 214, wherein arranged on the screen housing 208 exit opening 210 for the sieved granules in the side wall 207th of the screen housing 208 is arranged, particularly preferably tangentially to the side wall 207 of the screen housing 208. The screen 211 associated with the grinding body 214 is connected to a via a motor M, preferably an electric motor or the like. , rotatably mounted in the direction of arrow 213 driven shaft 212 is arranged. The grinding media 214 is disposed above the screen 211 in the screen housing 208, whereby the granules to be screened are pressed continuously at constant pressure through the screen 211. Also the sieve device 204 of the second embodiment of FIG. 4 has an inlet opening 216 for transfer air, not shown here.

With regard to the side walls, inlet, inlet and outlet openings, etc., for the first embodiment according to the invention, the embodiments applicable to the second embodiment according to the invention can be transferred to the same extent.

The inventive screening device 204 according to the second embodiment has a cylindrical shape of the screen housing 208, wherein the design of the screen housing 208 of the screening device 204 over the height H of the screen housing 208 is conically tapered from the lid 206 to the bottom 219 designed. In the screen housing 208 of the screening device 204 is arranged screen 211 is the design of the screen housing 208 is formed accordingly. In addition, arranged in the screen housing 208 of the screening device 204 Mahlkörper 214 the design of the screen 211 is formed accordingly. As a result, screen housing 208, sieve 211 and grinding media 214 are optimally matched.

In contrast to the screening device 104 of the first exemplary embodiment, the screening device 204 additionally has a rotor disc 220. The rotor disk 220 is hereby arranged between the sieve 211 and the bottom 219 of the sieve housing 208 of the sieve device 204. The rotor disk 220 is arranged on egg ner ner driven via the motor M shaft 212. Thus, rotor disk 220 and grinding media 2014 are mounted on a shaft 212 and are always driven at the same speed Rotationsgeschwindig. It is also conceivable that the rotor disk 220 and the grinding body 214 of the screen 211 independently of each other, for example, via in each case via a separate motor, in particular an electric motor or the like. , drivable are. Here, the rotor disk 220 and the grinding body 214 are arranged on different shafts. Preferably, the rotor disk 220 of the screening device 204 is at least partially cone-shaped. The arrangement of the rotor disk 220 serves to protect the seal below the screen 211 and to prevent product from remaining on the floor 219 and not being transported further in the direction of the extraction of the outlet opening 210. As a result, an even better and more complete transfer of the product is achieved and accumulations or deposits of the granules in the region of the bottom 211 of the screen housing 208 and of the side wall 207 of the screen housing 208 are minimized.

A further improvement of the product transfer is achieved in that the inlet opening 216 for transfer air, not shown here, is arranged on the side wall 207 of the screen housing 208, preferably the inlet opening 216, not shown here, is mounted tangentially on the side wall 207 of the screen housing 208 for transfer air.

FIG. 5 shows a plan view of the second embodiment of the screening device 204 according to the invention with an outlet opening 210 for the granules arranged laterally on the screen housing 208 and an inlet opening 216 for transfer air. The one driven by a motor M arranged on a shaft 212 Mahlkörper 214 is above the screen 211 in the screen housing 208, which has not shown here ge cover 206 and a bottom 219, not shown, and a side wall 207, located and located in the Section plane XX. Offset from the sectional plane XX since Lich the inlet opening 216 for the transfer air on the side wall 207 of the screen housing 208 is arranged. As a result of the rotation of the grinding body 214 in the direction of the arrow 213, the granules are pressed or pressed through the sieve 211. The screening process is optimized by the transfer air entering the inlet opening 216. The combination of rotating Mahlkörper 214 and transfer air results in a verbes serten screening process of the granules.

Fig. 6 shows a cross-section of a schematic presen- tation of a portion of a high-shear granulator 2 with a third embodiment of a high-shear granulator 2 arranged screening device 304. The A passage opening 316 for the transfer air is tangential on zy-cylindrical screen housing 308 of the screening device 304 angeord net. Also tangentially, the outlet opening 310 is arranged on the cylindrical screen housing 308 of the screening device 304. The inlet opening 316 is in the embodiment in the horizontal sectional plane YY by the Siebvorrich device 304, the outlet opening 310 is in the third Ausfüh tion example in the also horizontal sectional plane ZZ through the sieve 304. In the third embodiment, the horizontal sectional planes YY and ZZ height above the construction H of the screen housing 308 of the screening device 304 zueinan the offset. However, such an offset between the cutting planes Y-Y and Z-Z is not absolutely necessary. The

Transfer air in the third embodiment, the Siebge- housing 308 of the screening device 304 through the inlet opening

Supplied 316 and is compared to the exit of the sieieb th granules through the outlet opening 310 of the screen housing 308 of the screening device 304 at a higher in the x direction GE superior position of the screen housing 308 of the screening device 304th The getroff for the first embodiment of the invention embodiments with respect to the side walls, inlet, a ritts- and outlet openings, etc. are transferable to the third inven tion proper embodiment to the same extent. The granules coming from the high-shear granulator 2 coming into the screening device 304 and is pressed by a not shown here Mahlkörper 314 through the sieve 311 with continu ously over the sieve 311 distributed constant pressure ge. By arranged in the upper region of the screen housing 308 tangential to the side wall 307 of the screen housing 308 inlet port 316 additionally occurs transfer air in the screen housing 304 of the screening device 308 and there is a ent against the x-direction spiraling downward air flow within the cylindrical Screen housing 308 of the screening device 304 generates. This air flow transported on the way through the screen housing 308, for example, on the screen housing 308 adhering or deposited granules with in the direction of exit opening 310 and thus prevents a Verb enticing the screening device 304 by the granules themselves by the tangent to the side wall 307 of the screen housing 308 arranged Exit opening 310 is additionally ensured for optimum suction of the granules and the transfer air.

In Fig. 7 is a plan view of the schematic representation shown in Fig. 6 one on a high-shear

Granulator 2 arranged screening device 304 according to the third embodiment shown. Here, it can be seen that the transfer air inlet port 316 and the product discharge port 310 are disposed on the same side of the screen case 308. In addition, both the inlet opening 316 and the outlet 310 outlet opening tangent to the side wall 307 of Siebge housing 308 of the screening device 304th

In each of the geometry used the Siebvorrichtungen 104, 204 and 304, it is sufficient to suck the transfer air, preferably via a tangential on the Be tenwand 107, 207 or 307 arranged outlet opening 110, 210 or 310 and thereby achieve a fast and si-safe product transfer ,

Claims

claims

1. screening device (104, 204, 304) for the screening of Granu lat, in particular moist and / or dry granules, to summarize

(a) a sieve housing (108, 208, 308) having a bottom (119, 219, 319), a cover (106, 206, 306) and a side wall (107, 207, 307),

(b) an inlet opening (116, 216, 316) for the granulate arranged on the screen housing (108, 208, 308),

(c) a sieve housing (108, 208, 308) arranged outlet opening (110, 210, 310) for the screened Gra nulat,

(D) in the screen housing (108, 208, 308) arranged

Sieve (111, 211, 311), and

(E) an inlet opening (116, 216, 316) for transfer air, characterized in that the sieve housing (108, 208, 308) arranged outlet opening (110, 210, 310) for the GE seventh granules on the side wall (107, 207 , 307) of the Siebge housing (108, 208, 308) is arranged.

2. Screening device (104, 204, 304) according to claim 1, characterized in that the screen housing (108, 208, 308) has a cylindrical construction.

3. Screening device (104, 204, 304) according to claim 1 or to claim 2, characterized in that the screen housing (108, 208, 308) is at least partially conically shaped.

4. sieving device (104, 204, 304) according to one of the preceding claims, characterized in that the Siebge housing (108, 208, 308) arranged outlet opening (110, 210, 310) for the sieved granules tangentially on the sides wall (107, 207, 307) of the screen housing (108, 208, 308) is arranged.

5. sieving device (104, 204, 304) according to one of the preceding claims, characterized in that the outlet opening (110, 210, 310) above the inlet opening (116,

216, 316) for transfer air is arranged.

6. sieving device (104, 204, 304) according to one of the preceding claims, characterized in that the Siebge housing (108, 208, 308) arranged sieve (111, 211, 311) accordingly the design of the sieve housing (108 , 208, 308) is out forms.

7. Screening device (104, 204, 304) according to one of the preceding claims, characterized in that the Siebvor direction (104, 204, 304) in the screen housing (108, 208, 308) arranged grinding body (114, 214, 314 ) having.

8. sieving device (104, 204, 304) according to claim 7, characterized in that in the screen housing (108, 208, 308) arranged Mahlkörper (114, 214, 314) above the sieve (111, 211, 311) arranged is.

9. sieving device (104, 204, 304) according to any one of claims 6 or 7, characterized in that the sieve in the Siebgehäu- se (108, 208, 308) arranged grinding bodies (114, 214, 314) according to the design of the sieve (111, 211, 311) is ausgebil det.

10. sieving device (104, 204, 304) according to any one of claims 6 to 8, characterized in that in the Siebgehäu- se (108, 208, 308) arranged grinding body (114, 214, 314) is rotatable.

11. Screening device (104, 204, 304) according to any one of claims 6 to 9, characterized in that in the Siebgehäu- se (108, 208, 308) arranged grinding body (114, 214, 314) via a motor (M) driven is.

12. Screening device (104, 204, 304) according to one of the preceding claims, characterized in that the inlet opening (116, 216, 316) for transfer air on the side wall (107, 207, 307) of the screen housing (108, 208, 308) is arranged.

13. sieving device (104, 204, 304) according to claim 12, characterized in that the inlet opening (116, 216, 316) for transfer air tangentially to the side wall (107, 207, 307) of the screen housing (108, 208, 308) is arranged.

14. Screening device (104, 204, 304) according to one of vorherge existing claims, characterized in that the Siebvor direction (104, 204, 304) has a rotor disc (220).

15. Screening device (104, 204, 304) according to claim 14, characterized in that the rotor disk (220) in Siebge housing (108, 208, 308) between the sieve (111, 211, 311) and the bottom (119 , 219, 319) of the screen housing (108, 208, 308) is arranged.

16. Screening device (104, 204, 304) according to one of claims 15 or 16, characterized in that the rotor disc be (220) via a motor (M) can be driven.

17. Screening device (104, 204, 304) according to one of claims 15 to 17, characterized in that the rotor disc (220) is at least partially cone-shaped.