DE3218773A1 - Device for cleaning and classifying cereal, seeds or the like - Google Patents

Abstract

In a device for cleaning and classifying cereals, seeds or the like in which a main fraction is divided into two substreams, a first substream, which essentially contains only useful material and a second substream which, in addition to useful material, also contains weaker material, both substreams are subjected to Schrollen sifting and then cleaning in different classification and cleaning sieves. In this process, the Schrollen sieves are arranged one on top of the other and partially overlapping one another. A further fraction is fed into an expansion space; the useful material contained in this fraction then drops out of the expansion space onto a third Schrollen sieve to which a further classification sieve is assigned. This third Schrollen sieve and the associated classification sieve located below it are also arranged, at least partially overlapping one another, above the first and second Schrollen sieve. In this way, performance is improved without the basic outline of the machine having to be increased substantially, only a somewhat greater constructional height having to be accepted, space for which is however, in any case frequently available at the respective installation site.

Description

<Il t · · ·

(it I · · ·

I · · »

Patent attorneys Dipl.-Ing. H. WeickmAnn; Dipl.-IPhys; Dr. K. Fincke

Dipl.-Ing. F. A / Weickmann, Dipl.-Chem. B. Huber _CG0 Dr. Ing.H. Liska

May 18, 1982

8000 MUNICH 86, DEN

PO Box 860 820

MCiHLSTRASSE 22, CALL NUMBER 98 39 21/22

Happle GmbH & Co. Maschinenfabrik, 7912 Weißenhorn

Device for cleaning and sorting grain, seeds or the like Useful good

I ·· ··! ·! · Il f I

(. ••• it · · t ·

t · »III · · · ·

· · · · Ill

The invention relates to a device for cleaning and sorting grain, seeds or the like Useful goods according to the preamble of claim 1.

Such a device is known from DE-PS 26 50.

The known device has proven itself to be excellent in practice. When trying to improve the performance of the known device to increase, it has been shown that with a mere change in size below Retention of the unchanged geometrical structure There are limits, especially if you have the Want to keep the overall size of the device as small as possible.

The invention is based on the object of designing a device of the generic type in such a way that that one can achieve significant increases in performance with a minimum of increasing the size of the overall device can.

To solve this problem, the measure according to the characterizing part of claim 1 is proposed. Furthermore, it serves to increase performance without significantly increasing the overall dimensions of the device, if the measure of claim 2 is applied at the same time. Appropriate further training measures result from claims 3 to 18.

Description I.

\ Device for cleaning and sorting grain, jj

Seeds or similar useful goods \

The attached figures explain the invention. Show it:

Figure 1 is a schematic overview of the usual composition of a grain and Contamination of existing goods, their grain or useful goods fraction sorted and its Impurities should be removed.

Nj Figure 2 is a schematic sectional side view of the

i | from DE-PS 26 50 617 known device

p, to explain the principles of the invention.

if Figure 3 is an enlarged view of part of the

jf sorting arrangement and the cleaning sieve of

Figure 2.

FIG. 4 shows a partial longitudinal section along the line IV-IV

j | in Figure 3 to explain the distribution

§ Facility.

FIG. 5 shows a representation similar to that of the FIGURE of a device according to the invention.

Figure 1 shows an overview of the form in the grain, which is here as an example of the to be cleaned and useful goods to be sorted are to be used, normally delivered from the harvest. The grain is there Part of a mix that has good and poor quality cereal grains. The mix contains

·· ·> ιιι · »ι

• I I · · · · »II

- 10 -

also so-called curls, i.e. impurities that are larger than the good grains of cereal, and can be as heavy, lighter or heavier than these. As another Impurities are grains of sand that are smaller than the grains and different are difficult. Finally, there are also lightweight parts, such as straw, dust, etc., which cannot be recycled. Only part of this mix can therefore be sent for further processing as cleaned grain. The task of the cleaning and sorting devices is to sort out this grain fraction and remove the impurities to free.

To carry out this work, the device sees a very specific combination of wind selection and Sieving before. Fig. 2 shows schematically this device in a sectional side view. The case the device consists of two parts 1 and 2. In the housing part 1 there is the crop inlet 3 and an air inlet 4 and an air outlet 5. The goods delivered pass through the goods inlet 3 via a feed shaft 6 to the wind readout device. The feed shaft 6 ensures an even distribution of the feed over the length of the device. The wind readout device consists primarily of the grate 7, which consists of several pivotably arranged profile rods may exist. The grate 7 is from bottom to top of a Passed through air flow, which is indicated by the arrow 8 and coming from a fan 9 through the air inlet 4 enters the housing part 1. The wind readout device also includes a guide surface 10, which

·· lit · · t ··

111 »til

I III! · · <

the mixed material metered in by the feed shaft 6 The action of gravity from a substantially perpendicular Movement diverts into a substantially horizontal movement over the grate 7 away. Guiding resp. Deflection surfaces 12, 13, 14 of the wind readout device serve to guide the resulting currents in suitable paths. To adapt to special compositions of the material to be mixed, these guide or deflection surfaces can be adjustable.

When the mix the Pührungsflache 10 in a dependent leaves this guide surface in a more or less horizontal direction from the set inclination, it comes under the influence of the air flow 8. The heavy parts of the mix fall depending on their weight and the strength of the air flow against this sooner or later downwards. In contrast, the lighter ones Components of the mix are carried away by the air flow and lifted over the grate 7. The one by itself or after striking one of the guide or deflection surfaces 12 or 13 part of the mixed material that falls down is referred to as the first fraction, which is indicated by the arrow A in FIG. The remaining part, carried away with the air flow, is then the second fraction, which corresponds to arrow B.

The constituents contained in fractions A and B are shown in FIG. 1. Fraction A then comprises heavy rolls, good grain, weaker grain, and sand. Fraction B contains light rolls, possibly a small proportion of good grain as well as weaker grain and non-recyclable light parts.

t to «· · <

■ I I · ·

A peeling plate 15> | arranged behind the grate 7 (which does not necessarily have to be sheet metal) | divides the falling fraction A into two parts- | flow I and II on. The position of the peeling plate 15 is <| chosen so that the substream I, as can be seen from FIG. 1, contains only good grain apart from impurities. I; For this purpose, the peeling plate 15 is arranged behind the grate 7 in the flow direction of the -i good and is approximately the! ■; Curvature of the material flow in this area is correspondingly f curved, ie when viewed from the input end of the grate * concave. The approximately arranged at the level of the grate 7 Abschälblech 15 stands on beyond the plane of] [grate upwards and downwards. Since there is no sharp separation between ji good and weaker grain in the '} ■ Wind readout means, this situation leads ■ § 15 of the Abschäblechs necessarily cause the;: | Partial flow II apart from impurities both good and |; also includes weaker grain. The partial currents I and ίί II are separated under the wind readout device , collected and processed further. l -

The air flow entraining the second fraction B is | -t

with the help of the guide or deflection surfaces 12 and 14 in U

an expansion space 16 within the first housing ψ

partly led. In the expansion space 16 | 5 slows down

the flow, what in connection with the deflection to it '; ■

leads to the heavier parts of the second fraction; |

settle at the bottom of the expansion space, while the not i; i

recyclable lightweight parts together with the air through ^

the air outlet 5 can be sucked off. This division B-

the second fraction into a third and a fourth m

Partial flow is shown in Fig. 2 again by corresponding '[I

Arrows III and IV indicated. The partial flow III ent- (J

holds, according to FIG. 1, slight curls, essentially J

weaker grain, sand and a little light parts. '*

• · · IIII · · *

I t 111 ■ Ι 1

; | In contrast, the partial flow IV consists primarily of dust

I and the like more easily contaminated

1 air.
(ft

I The air extracted from the air outlet 5 becomes a

I Air purification device in the form of a pre-separator

ΐ | 17, which is a centrifugal separation

i can act Scheider. The pre-separator 17 separates the

I air sucked out of the housing part 1 in a min-

^! | at least 10% proportion of dirt-saturated air and

I have a residual proportion of relatively purified air. the

if relatively purified air is returned to the fan 9

; ■ supplied so that there is an air circuit. the

ί Dirt-saturated air is extracted from the pre-separator 17

:: sucked off and sent to a second cleaning device

X leads before it is released to the atmosphere.

;,; The fan indicated in FIG. 2 is used for this purpose

I 18 and the cleaning device 19, which is

f. can be a cyclone.

1 The housing part 2 houses collection devices and

I screening devices for the first to third partial flow.

κ The screening devices, which are described in detail below

κ are described, are combined to form a sieve block 20

I taken, which by means of an unbalance drive 22 in vibratory

I will be relocated. That in the first substream I.

§ the grate 7 falling down meets an im

I housing part 2 arranged under the grate collecting surface

I 23, the first partial flow I at the end of the task of a

[| first roll screen 24 directs. The roll sieve 24

I is designed so that the grains and the fine

I put granular contaminants through the sieve

% a collecting funnel 25 while the scrolls fall

- 14 -

■ · ■ »· · t · 4

• · »lilt · · I I ··· I »·. · T · I · · t · ■>"! · "

• · ·· II »tt I · · I

remain on the sieve surface. A channel 26 connects the collecting funnel 25 with a cleaning sieve. The fine-grained ones fall through this cleaning sieve 27 Impurities, primarily sand, through, while only the good grain you are looking for remains on the Sieve remains and are guided to Nutzgutauslaß 28 via an ir., Individual channel (not shown) can. The removal of the remaining parts on the sieves is effected by the fact that the sieves are opposite the horizontal are inclined, so that parts remaining on the sieves as a result of the imbalance drive caused vibrations migrate from the sieve inlet side to the lower sieve outlet side and over the sieve edge fall into appropriate collecting devices or channels.

The second partial flow II is collected between collecting and guide surfaces 29 and to a second Scroll screen 30 passed. The second scroll screen 30 lies in the same inclined plane as the first Scroll sieve 24 and connects directly to this. Another is located under the scroll screen 30 Collecting funnel 32, which collects the portion of the second substream that has been cleaned of rolls and via a further channel 33 leads to a distribution device 34. The distribution facility 34 distributes the second Partial flow evenly on three sorting sieves 35 arranged one below the other, which correspond in structure. The distribution device 34 will be explained in greater detail later with reference to FIG. 4. The sorting sieves 35 are constructed in such a way that only good grains remain on the sieve surfaces, while weaker grains

• »I« ·· · I I «

I «III · ■ (

_ 1 C _ lit t ■ lit ti it

grains and fine-grained impurities through the sieves into collecting trays 36 arranged below fall. The good grain falls over the lower-lying edges of the inclined sorting sieves 35 into one Channel 37 and via this also reaches the usable material outlet 28. The collected in the collecting trays 36 Well, which consists primarily of weaker grain, is passed through a further channel, not shown a second outlet 38 and can be used as a second choice material such as feed grain or the like be used.

Since the first substream I already comprises one third to one half of the grain portion of the first fraction A, stands for the remaining grain portion in the second partial stream II a large sieve area for the Sorting available. The sorting can therefore be carried out much more effectively and quickly be as if the division into the partial flows I and II did not take place and the entire first Fraction A should have been subjected to a sorting sieve. Since the first substream I by the choice the position of the peeling plate 15 based on the grain quality already has the desired high degree of purity possesses, the cleaning sieve 27 does not need to carry out any sorting but only cleaning. The sieve performance of the cleaning sieve, i.e. the amount of material to be added per unit of area and time can therefore be much greater than that of the sorting sieves 35. The greater part of the space available within the device can therefore be covered with sorting sieves to create the largest possible sorting sieve area. The so achieved high sorting sieve performance ensures that the second substream II properly in good and weaker grain is sorted.

• *

t.

As can also be seen from FIG. 2, the sorting sieves 35 are arranged above the cleaning sieve 27. The distribution device 34 is located at the somewhat raised ends of the sorting sieves on the left in FIG. 2 35 »The channel 26, which leads the first partial flow I from the collecting funnel 25 to the cleaning sieve 27, is located according to Fig. 2 on the left side of the ^

Distribution device 34 so that the first and the two j | te partial flow without crossing from the separating point defined by the peeling plate ^ 15 to the cleaning sieve ^; ?

27 or the sorting sieves 35 arrive. The scrolls.,

sieves 24, 30, 46 are above the sorting sieves

35 arranged and below the collecting surface 23 or ι

the collecting and guiding surfaces 29. The channel 37 which is common to the cleaning sieve 27 and the sorting sieves 35 and which receives the good grain is located according to ' ^r '

Figure 2 on the right side of the lower ^waste. Administration ends of the cleaning and sorting screens 27 and 35, respectively.

Fig. 3 shows an enlarged part of FIG. 2 with the

Channel 26, the distribution device 34, part of the ^;

Cleaning sieve 27 and parts of the sorting sieves 35 and Ϊ?

their collecting trays 36. Under the sieves 27 or 35 ■:; · one can see screen cleaner 39, which consists of rubber balls 40

exist, which are held in a cage 42 so that>

they open when the sieve unit oscillates and: ■

dance off. These dancing rubber balls 4 0 hit

like against grains or stones or, who watched '>,

may have jammed in a sieve opening. The ■

Sieve cleaners are designed in such a way that they pass through. (

the parts passing through the screens 27 and 35 fall into i |

do not interfere with the drip trays 36 or 43. ■ '

• t 11 »·

- 17 -

Fig. 4 shows in a partial longitudinal sectional view according to the line IV-IV in Fig. 3, the distribution device 34. The distribution device 34 has, distributed over the length of the device, arranged alternately high Collecting arches 44. The material falling down evenly in the channel 33 over the length of the device

i therefore meets the highest in a longitudinal section

; Collecting floor 44, in the adjacent longitudinal section

I the middle collecting tray 44 and in the next but one longitudinal

I cut up on the lowest collecting tray 44. above

j adds up the length of the device, meets the

\ uppermost collecting trays 44 the same amount of material as on the

I middle and on the lowest collecting trays 44.

■ j The material falling on the uppermost collecting trays 44 becomes

I delivered to the top screen 35 while

5j the middle collecting trays the middle sorting sieve and

I the lowest collecting trays the lowest sorting sieve

I send.

\ As stated earlier, the wind

\ readout device entrained with the air flow second

I Fraction B depending on the quality of the abandoned good

ύ a not inconsiderable part of usable grain

i; des, but at least usable as feed grain

I contain weaker grain. This part represents two

.: th fraction B is heavier than the slight

': cleaning and therefore settles as a third substream

'!, III at the bottom of the expansion space 16. From a public

This third falls in the floor of the expansion room

f Partial flow to a collecting area below

: 45. The collecting area 45 carries the goods of the third part

I · I) ill « I · · ·

■ I · I .1 I

- 18 -

Stream III to the feed side of a third scroll screen 46. The third scroll screen 46 closes in the same Level of the first two scroll screens 24 and 30 to the latter. The three scroll screens form on top of this Create a plane slightly inclined to the horizontal, at the highest end of which the heaviest Rolls and at the lowest end of which the lightest rolls remain on the sieve surface. As already stated, migrate - due to the inclination of the sieve surface in connection with its oscillation - The rolls from the higher end of the sieve or sieve to the lower one, to finally over the lower end edge of the third scroll screen 46 to fall into a channel 47. The channel 47 leads the scrolls to a waste outlet not shown in detail. Incidentally, also become the same waste outlet the fine-grained impurities are passed with the help of the cleaning sieve 27 from the first partial flow I were sieved out and collected in the drip tray 43. The one penetrating the third scroll sieve 46 Part of the third substream X-II is collected by a sorting sieve 48, which is located directly below the third scroll screen is arranged. Grain grains remain lying on the sorting sieve 48, at least in terms of size are to be counted among the good grain. This grain, which due to a tendency also des Siebs 48 falls into a further channel 4 9, depending on the result of a test, can optionally to the useful material outlet 28, to the second outlet 38 or back to the material inlet 3. The quality of the channel 49 collected grain depends on the type of goods delivered, so the decision for one of the three alternatives mentioned must be made depending on the individual case. That of a drip tray 50 Goods collected under the sorting sieve 48, which are in

Il ■ · · · I It ··

I. lilt

primarily from weaker grain and possibly
fine-grained impurities will have a
channel, not shown, to the second outlet 38 for material i

rial of second choice.

The amount of material to be sorted by the sorting sieve 48 is significantly less than the amount of material in the second substream II, so that the area of the sorting sieve 48 is at
the same screening performance can be much less than the total area of the sorting screens 35.

A pipe 52 opens out below the air outlet 5
the housing part. The pipe 52 is connected to suction pipes 54 and 55 via an elastic connecting member 53
connected inside the sieve block 20, whereby a,

Dust removal of the screen block is achieved. A window ;

56 within the housing part 1 enables in connection ·,

manure with a lamp 57, the function of the wind readout _; ,

f facility to be observed from the outside. This will make the

Optimal setting of the adjustable wind readout parts made easier. The measures provided for each sieve j, · sieve cleaner 39 are shown in Figure 2 each "hinted _f...?:

The above representation of the known device ρ

according to DE-PS 26 50 617 not only serves to explain- '■■ ·.

tion of the prior art but also the explanation of the principles of the invention and therefore provides
a part essential to the invention disclosure is ^l '. |

In Figure 5, the changes are shown in

the solution according to the invention compared to the known; ^;

I t

32Ί8773

- 20 -

Solution have been made, with analogous parts with;, "

the same reference numerals are provided as in the Fig->

1 ren 1 to 4, each increased by 100. #

The following results from FIG. 5: ^

The second scroll screen 130a, 130b is above the first one

Scroll sieve 124a, 124b arranged and overlaps »jj

with this in the overflow direction of the scroll sieves, i |

which in FIG. 5 as well as in FIG. 2 from the left fj

to the right and thus from top left to bottom right jf

leads. Correspondingly, the channel 133 for the supply includes || guiding the through the second scroll screen 130a, 130b '»■!

useful material passed through to the distribution device ί;

134 one in FIG. 5 from top right to left i |

downward sloping collection and drainage surface 133a, which \ <

ψ run along the lines from top left to bottom right- "';

the collecting funnel 125 connects and below the ji

first scroll screen 124a, 124b. Next is:

the first scroll sieve 124a, 124b one from the right '$

collection and drainage surface inclined to the top to the left %

126a, which opens into channel 126, the %

in turn leads to the cleaning sieve 127. You can see %

that in this way one can without enlarging the floor plan V \

the device a substantial increase in the Yl

Areas of the first scroll screen 124a, 124b and the Ά

has reached second roll screen 130a, 130b, where 1

only a certain increase in the device in FIG. 1;

Purchase had to be taken. |

• ·· I ···· I) t

• · · Il ·. ι

··· ·· Il ■ ·· ll>

ί It can also be seen from Figure 5 that the third step

| lens sieve 146 for the third substream III and that for him

If associated sorting sieve 148 above the second

<| Scroll sieve 130a, 130b are arranged, also here

if again with an overlap in the direction of the sieve overflow. It can

So despite the enlargement of the first scroll sieve

I 124a, 124b and the second scroll screen 130a, 130b

I the third scroll sieve 146 without enlarging the

I floor plan of the device can be accommodated,

I derum with only a slight additional

I increase the overall height.

I In this embodiment, the

I scroll sieve 146 only the product flow III

I don't sieve but the overflow from the scroll sieves

'ξ 124a, 124b and 130a, 130b. The scroll sieves 124 a,

I 124b and 130a, 130b seven the substreams I and IU

I single.

>! The residue (kick) on the seven 124 a, 124 b and

fl 130 a, 130 b and 146 can nevertheless be taken together from the

ij machine can be removed.

I The known device was in a series

1 m wide, 1.5 m wide and 2 m wide (the width in each case perpendicular to the plane of the drawing 2 measured) with outputs of 40, 60 and 80 tons per hour.

You can now think of a four-series of 40, 60, 80 and 120 tons of output each per hour to achieve by having a 1 m wide machine for 40 to according to Figure 2 and for 60 tons with a correspondingly greater overall height

- 22 -

5 provides, and that a 2 m wide machine for 80 tons according to the design according to FIG. 2 and for 120 to with a correspondingly greater height corresponding to the design according to FIG. It is readily apparent that in this way with a smaller number of different dimensions Components can create a larger series, although it is of course at liberty for the type of construction in accordance with FIG. 5, the number of sorting sieves 135 and 148 can optionally be increased. Furthermore the machine according to Figure 5 has all the advantages and possibilities that the embodiment according to Figure 2 are peculiar.

Claims (18)

It lit Il) ■ · «· Claims Device for cleaning and sorting grain, seeds or similar useful goods with a wind readout device which has an essentially horizontally arranged and essentially Enclosed vertically from bottom to top by an air stream penetrated grate, over which the feed material is passed away, wherein a first, almost the entire portion of the useful material containing fraction A falls through the grate or down behind it, furthermore with one arranged below the grate I Separation device that divides the first fraction A, I seen in the right direction of flow of the feed material, in I one first in the direction of the feed and one at the back I second partial flow I or II divided so that the first substream I in the we essential only good useful goods and the second part (| Stream II contains good and weaker useful goods, ll furthermore with a p gene sorting sieve arrangement for the second substream |) II, this sorting screen arrangement from the second j'l Teilstrom II sorts out the good useful goods, i | also with a reunification body for the ι? ' Reunification of the rejected good useful goods U of the second substream II and the first substream I, I It ···· f I I • III · · · t ι ι η ι ι also with a Nutzgutauslaß for that in the reunification point united useful goods, furthermore with one in front of the reunification point below the separating device and above the sorting screen arrangement located first scroll screen to remove coarse impurities from the first partial flow I, furthermore with one below the separating device and above the sorting sieve arrangement, the sorting sieve arrangement upstream second roll screen to remove coarse impurities from the second substream II, furthermore with an expansion space arranged above the first and the second scroll screen, into which the the second fraction B entrained air flow is directed and deflected there, the air flow in the Expansion space slows down and the useful goods contained in it and possibly some of the impurities settle, this expansion space has an air outlet through which the rest Contaminants are removed with the air, furthermore with an opening in the bottom of the expansion space and a third downstream located above the sorting screen arrangement Roll sieve, furthermore with a sorting screen connected downstream of the third scroll screen, _ 4, U. whereby the sieves are each loaded at their rear end in the loading direction and after their in The front end of the feed direction is overrun in each case in the area of the front end in the feed direction At the end of the sieve residue or sieve failure, characterized in that the second scroll sieve (130a, 130b) is arranged above the first scroll screen (124a, 124b), and that the first scroll screen (124a, 124b) and the second scroll screen (130a, 130b) at least partially in the Overflow direction of the goods. 2. Device according to claim 1, characterized in that that the third scroll sieve (146) and the sorting sieve (148) assigned to it above the second Scroll sieve (130a, 130b) are arranged and at least partially in the overflow direction of the material overlap with this. 3. Device according to one of claims 1 and 2, characterized characterized in that the first scroll screen (124a, 124b) has a cleaning screen (127) for the first Partial current I is connected downstream. 4. Apparatus according to claim 3, characterized in that the cleaning screen (127) for the first Teilstrorr. I is arranged below the sorting screen arrangement (135) for the second substream II. 5. Apparatus according to claim 4, characterized in that that a first channel (133a, 133) for that of the second - 3 - Scroll sieve (130a, 130b) coming useful goods of the second S; j! Partial flow II under the first scroll screen (124a, 24b) jf through from the front end of the | second scroll screen (130a, 30b) to a distributor | device (134) on the rear I in the feed direction End of the sorting screen assembly (135) and that | a second channel '(126a, 126) the useful material of the first substream EJ on the rear side of the first $ in the direction of delivery Channel (133) along to the one below the sorting | Sieve arrangement (135) arranged cleaning sieve (127) f leads down. - f!> 6. Apparatus according to claim 5, characterized in -kj that the first channel (133a, 133) one under the first Ii - ■■■ * ^: Scroll sieve (i24a, i24b) in the direction of its in ti Direction of feed at the rear end towards and downwards ίΐ Inclined collection and drainage area (i33a) includes. JH ■■ I 7. The device according to claim 6, characterized in that the second channel U (126a, 126) an area under the first Ii Schrollensieb (124a, 124b) and above the first? J collection and drainage (133a) to the in Aufgabe- j | towards the rear end of the first scroll screen (124a, 124b) sloping back and forth
second collection and drainage surface (126a). 8. Device according to one of claims 1 to 7, characterized
characterized in that the separating device (115) is an in
horizontal flow direction of the feed material behind
comprises peeling plate (115) arranged on the grate (107). lilt - D ~ 9. Apparatus according to claim 8, characterized in that the peeling plate (115) one of the curvature of the material flow has the appropriate form in this area. 10. The device according to claim 9, characterized in that that the peeling plate (115), in the horizontal flow direction (A) of the goods, is concavely curved and protrudes upwards over the grate (107). 11. Device according to one of claims 8 to 10, characterized in that the position of the peeling plate (115) is adjustable. 12. Device according to one of claims 3 to 11, characterized in that the screen surface of the sorting screen arrangement (135) is a multiple of the screen area of the cleaning screen (127). 13. The device according to claim 12, characterized in that that the sorting sieve arrangement (135) comprises a plurality of sorting sieves arranged one below the other. 14. Device according to one of claims 1 to 13, characterized in that the sorting screen arrangement (135) a collecting device Π36) for that through the sorting sieves weaker useful material falling through is assigned, which at a second material outlet (138) connected. 15. Device according to one of claims 1 to 14, characterized in that the air outlet 00) * of the expansion space (116) an air cleaning device (117, 118, 119) is connected downstream. 16. Device according to one of claims 1 to 15, characterized characterized in that the sorting sieve (148) of the third substream III has a collecting device (150) for the falling through Is well connected downstream, which is optionally connected to the second outlet (138). 17. Device according to one of claims 1 to 16, characterized in that the sorting screen (148) of the third
Partial flow III is assigned a collecting device for the retained goods, which · optionally with the Nutzgutauslaß (1'28), with the second outlet (138) or can be connected to the material inlet (1 (B)). 18. Device according to one of Claims 1 to 17, characterized in that the sieves, in particular the sorting sieve arrangement (135) and the cleaning sieve (127) ·, to
a common and mutually displaced in vibratory movements sieve block are combined.