DE7635001U1 - DEVICE FOR CLEANING AND SORTING GRAIN, SEEDERIES OR THE LIKE. OTHER BENEFITS - Google Patents

Description

Patent attorneys Dipl.-Ing. H. Weickmann, Öj ^ L ..-) * HVfc _{; B} ] DR7K: Bjtfc: Kii

D1PL.-ING. F. A. Weickmann, Dipl.-Chem. B, Huber Dr. Ing.H. Liska

8000 MUNICH 86, DEN * », $ Gp,

CA POST BOX 860 820 MDHLSTRASSE 22, CALL NUMBER 98 3921/22

Happle GmbH & Co., machine factory,
P.O. Box, 7912 Weißenhorn, FRG

Device for cleaning and sorting grain, seeds or the like, other useful goods.

The innovation relates to a device for cleaning and sorting grain, seeds or the like Useful goods comprising a wind readout device with an essentially horizontally arranged grate, this grate with air supply directed essentially vertically upwards from below and one in the area of a feed end of the grate arranged, directed over the grate away feed supply, further comprising one ending above the grate Discharge for a second fraction, namely light impurities such as peel and straw as well as weaker ones Air flow containing useful material and a separating device assigned to the grate for the subdivision of one of this second Freed fraction, the first fraction containing the essential part of the good useful material in two substreams, one the The first partial flow closer to the feed end of the grate and a second partial flow further away from the feed end of the grate, see above like first and second collection and continuation devices for the first and the second partial flow, respectively.

A method and a device of this type are known from DT-PS 1 167 635. The known device has a grate made of profile bars in a housing, which is slightly inclined to the horizontal and to which the material is fed in a substantially horizontal movement from one end. The rust is penetrated from below by such a strong air current that only the heavy parts of the abandoned material pass through the profile bars of the grate fall down through it, while lighter parts such as light impurities and more or less light cereal grains are torn upwards with the air flow. The down The fraction of the abandoned material that falls through the grate therefore contains the predominant part. Share of Useful goods, whereby the good useful goods, which are relatively heavy, fall through the grate at the beginning, while the lighter, weaker useful goods are initially carried a bit by the air flow over the grate and only fall down near its end.

Under the grate there are two separate collecting devices for the falling goods an adjustable flap are separated from each other that the goods falling through the grate in front of the flap forms a first partial flow, which falls into a different collecting device than the second, behind the flap Partial flow falling through the grate. The useful goods contained in the first partial flow are on average better than that of the second substream. However, it is not possible to adjust the flap so that the first partial flow only good useful good and the second substream contains only weaker useful good. Rather be Both in the first partial flow and in the second partial flow good useful good parts are located. One exact sorting is therefore not possible with the known device.

In another known grain cleaning machine

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the material is first placed in a similar manner on the horizontally arranged grate of a wind readout device, abandoned, which is penetrated from the bottom up by a stream of air, so that lighter grain bodies and light contaminants are dragged upward with the airflow, while only the heavier parts of the Abandoned goods, which include both useful goods and impurities, fall down through the grate. However, there is no division of the fraction of the abandoned material below the grate Guts made in different substreams. Rather, the fraction that fails will be evenly divided into two separate sieve arrangements distributed, both of a so-called scroll sieve and a sand sieve exist. The scroll screens are designed in such a way that the good and the weaker useful goods are included the useful material in the size corresponding and smaller impurities fall through the sieves, while Rolls are coarse impurities such as thistles, large stones and the like on the sieve surface remain behind and be removed from here as waste. The parts passing through the scroll screens arrive onto a sand sieve through which fine-grained impurities and possibly broken grains fall through, while the useful material remains and is led to a useful material outlet. With this known device the desired separation of the useful material into good and weaker useful material cannot be carried out.

The task of the innovation is to improve the separation of the first fraction freed from the second fraction to enable a first partial flow and a second partial flow in the sense that the first partial flow essentially only contains good grain and possibly correspondingly heavy impurities and the second substream

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in addition to good grain, essentially the weaker grain grain and, if necessary, correspondingly heavy contamination. .. |

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This object is according to the invention in a device of the type mentioned in f achieved in that the separation device consists of a I in a horizontal direction of flow of the feed f behind the grate disposed peel I

sheet is made. . j |

1 Further design measures with the aim of achieving the best possible | j To achieve optimal separation of the second fraction in the first and second substream, are in the claims 2 to 7 recorded.

With the help of the design of the separating device according to the innovation, it is possible to measure the wind readings received, the predominant part of the useful goods dev- |

to divide the holding fraction into two partial flows,

that the first, possibly in addition to impurities, is almost only £

Ψ still contains good useful goods. This has the consequence that "'

the second substream is essentially weaker useful goods, but also a not inconsiderable part of good useful goods. So that this proportion of good useful material is also obtained in the second partial flow,; This second substream is used for sorting purposes Subjected to separation into good and weaker useful goods. This sorting sieving can be done with a good efficiency and a high screening capacity, as in the context of such a cleaning and sorting device usual size for the second partial stream, which is only a more or less large part of the first Firak- < tion, a relatively large screen area can be made available.

For the second partial flow, the good and weaker one

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Contains useful material, a sorting screen and a a first channel connecting a collecting device for the second partial flow to this sorting sieve arrangement be present, the sorting screen device from the good useful material is sorted out from the second partial flow, while a second and a third channel are available which lead the sorted out usable material and the first partial flow to the same usable material outlet.

As a rule, the abandoned goods contain coarse and / or fine-grained impurities, which also consist of the first partial flow must be removed before it is led to the Nutzgutauslaß. To this end you can a first roll screen for removing coarse contaminants and / or a cleaning screen for removal fine-grained impurities can be provided for the first partial flow, which pass through a further, fourth channel are connected to the collecting device for the first partial flow. Fine-grained impurities are made up the second partial flow automatically during sorting sorted out, so that only a second scroll screen is provided for the second partial flow must if corresponding impurities are to be sorted out. Since a cleaning sieve for the first partial flow in the carries out essentially no useful goods sorting, the cleaning sieve for the first partial flow can with a lower Sieving performance, i.e. with more material feed per sieve area and time unit than the sorting sieve arrangement for the second Partial flow are operated.

A third collecting device is preferably located under the sorting sieve arrangement, which collects the weaker one that falls through Catches useful material and possibly fine-grained impurities, this third collecting device via a fifth channel is connected to a second outlet, through which this weaker useful material as a second material

- 13 choice, e.g. as feed grain, can be discharged.

The second fraction of the abandoned good that comes from the air stream The wind reading alignment above the grate is also torn up, primarily consists of light Contamination such as dust, peel, broken peel and straw and, depending on the type of feed, more or more less good useful good together. So, on the one hand, the useful goods that may still be contained in this second fraction can be obtained, and so that, on the other hand, a pre-cleaning of the air flow is achieved, it is advantageous, when the air flow loaded with the second fraction is directed or diverted into an expansion space becomes, whereby its flow velocity slows down and the heavier part becomes the light one Deposit impurities and, if necessary, useful goods on the floor of the expansion space. Through an air outlet in the expansion space the air with the remaining impurities is then sucked off and an air purification device fed. An opening can be arranged in the base of the expansion space, opening over a sixth Channel is connected to a third scroll screen. On this third roll sieve, the Rolls back, while useful material and smaller impurities pass through the sieve onto a subsequent sorting sieve reach. This sorting sieve is designed similarly to the sieve of the sorting sieve arrangement already mentioned and lets fine-grained impurities and weaker goods fall through, while goods of good size remains on this sorting screen. A fourth collecting device under the sorting sieve catches this material that has fallen through and also directs it to the second outlet, i.e. to the outlet for material second Choice.

The useful good in terms of size, the third one

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Schrollensieb has passed through, but remains on the sorting sieve, can optionally to Nutzgutauslaß, for second outlet or back to the material inlet of the device. The decision which one of these If alternatives come into question, this can be made dependent on an examination of this good in individual cases.

It is advantageous if the first, the second and the third scroll sieve, i.e. the scroll sieve for the first partial flow, that for the second partial flow and that for the sediment from the expansion space side by side are arranged in the same plane. This has the advantage, among other things, that the remains on the three scroll sieves Rolls can be discharged via a common channel. For example, the three Scroll screens can be arranged in a plane that is slightly inclined with respect to the horizontal, so that the scrolls due to gravity, supported by the screen vibrations, to an edge of the scroll screen arrangement wander and fall into the drainage canal there. Another advantage of arranging the three scroll screens next to each other in one plane is that parts that jump over are caught by the respective neighboring roller screen will.

It has already been stated that the sorting sieve arrangement for the second partial flow has as large a sieve area as possible should have. This can be done with optimal use of the dimensions customary in a cleaning and sorting device Available space can advantageously be achieved in that one of the given height dependent number of individual sorting sieves are arranged one below the other in different levels, with one Distribution device ensures that the second partial flow, which has been pre-cleaned in the second scroll sieve, is uniform

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is distributed to the sorting sieves lying one below the other of the sorting sieve arrangement. ^v y

The air sucked out of the expansion space is usually heavy with light impurities, in particular Dust, straw and trash and the like can be enriched, so that this air advantageously is cleaned before it is returned to the wind readout device in a circuit.

The dependent claims 8 to 31 contain further features of the fire. These features are essentially aimed at starting out cleaning and / or cleaning of the optimal division of the first fraction obtained by the peeling plate To achieve sorting with optimal utilization of a total available sieve area and thereby the sieve areas in the smallest of spaces and with the simplest possible cable routing.

Claim 24 also aims to recover the useful goods still contained in the second fraction.

Claims 25 and 26 also aim at the further processing means for the useful material recovered from the second fraction into that existing for the first fraction To integrate the sieve unit, again with the aim of accommodating the sieve surfaces as space-saving as possible To keep the lines as short and constructive-simple as possible and, with further goals, to lay all lines in such a way that the goods can be transported solely on the basis of gravity and, if necessary, the vibrating effect of the sieves.

The aim of claim 27 is to use the useful material recovered from the second fraction in different ways, depending on the quality

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Claim 30 aims to improve the air cleaning capacity while avoiding environmental pollution to be kept as low as possible.

Claim 31 aims at trouble-free continuous operation.

The innovation is described below using an exemplary embodiment explained in more detail with reference to the accompanying drawings. Show it

Fig. 1 is a schematic overview of the usual Composition of a good consisting of grain and impurities, its grain or The useful goods are sorted and the impurities are to be removed,

Fig. 2 is a schematic sectional side view of a according to the innovation,

3 shows an enlarged illustration of part of the sorting arrangement and the cleaning screen of Fig. 2, and

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

in Fig. 3 to explain the distribution • device.

Fig. 1 shows an overview of the form in which the grain, here as an example of the to be cleaned and to intended to serve sorting useful goods, is normally delivered from the harvest. The grain is part of it a mix of good and poor quality cereal grains. The mix also contains so-called

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Rolls, i.e. impurities that are larger than the good grain kernels and equally heavy, lighter or can be heavier than this. As further impurities, there are grains of sand that are smaller than the cereal grains and are of different weight. Finally, there are also light parts such as straw and dust etc. exist that are not usable. Only a fraction of this mix can therefore be considered cleaned Grain can be sent for further processing. The task of the cleaning and sorting device is to do this To sort out the grain portion and to free it from the impurities.

To carry out this work, the innovation according to Device before a very specific combination of wind selection and screening. Fig. 2 shows them schematically Device in a side sectional view. The housing of the device consists of two parts 1 and 2. In the housing part 1 there are the material inlet 3, as well as an air inlet 4 and an air outlet 5. Through the Infeed 3, the delivered goods reach the wind readout device via a feed shaft 6. The dining wave 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 consist of several pivotably arranged profile rods can. The grate 7 is penetrated from bottom to top by an air flow, which is indicated by the arrow 8 and coming from a fan or compressor 9, it passes through the air inlet 4 into the housing part 1. To the wind readout device also includes a guide surface 10, which the metered by the feed shaft 6 mix Effect of gravity from a substantially vertical movement to a substantially horizontal movement diverts over the grate 7 away. Guide or deflection surfaces 12, 13 and 14 of the wind readout device are used to

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to direct the resulting currents in suitable paths. These guide or deflection surfaces can be adjustable in order to adapt to special compositions of the material to be mixed.
5

When the mix the guide surface 10 in a dependent of the set inclination of this guide surface more or less horizontal direction, it comes under the influence of the air flow 8. The heavy parts of the Depending on its weight and the strength of the air flow, the mix will fall sooner or later against it downward. On the other hand, the lighter components of the mix are carried away by the air flow and over the grate 7 lifted. The one by itself or after an impact on one of the guide or deflection surfaces 12 or 13 after The part of the mixed material that falls below is referred to as the first fraction, which is indicated by the arrow A in Fig. 1 is indicated. The remaining part, carried away with the air flow, is then the second fraction, the 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 slight scrolls, under Under certain circumstances, a small proportion of good grain as well as weaker grain and non-usable light parts.

A peeling plate 15 arranged behind the grate 7 (which does not necessarily have to be a metal plate) divides the downward falling fraction A into two substreams I and II. 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. Since the Wind readout device no sharp separation between

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good and weaker grain leads to this situation of the peeling plate 15 necessarily to the fact that the partial flow II apart from impurities both good and also includes weaker grain. The partial flows I and II are separated under the wind readout device caught and treated further.

The second fraction B entrained air flow is with the help of the guide or deflection surfaces 12 and 14 in a Expansion space 16 guided within the first housing part. In the expansion space 16 the flow slows down, which in connection with the diversion leads to the fact that the heavier parts of the second fraction settle on the floor of the expansion room, while the non-usable light parts together with the air through the Air outlet 5 are sucked off. This division of the second fraction into a third and a fourth substream is again indicated in Fig. 2 by corresponding arrows III and IV. The substream III contains after Fig. 1 light rolls, essentially weaker grain, sand and a little light parts. On the other hand, there is the partial flow IV of air enriched primarily with dust and the like, which is slightly contaminated.

The air extracted from the air outlet 5 becomes an air cleaning device in the form of a pre-separator 17, which is a centrifugal separator can act. The pre-separator 17 separates from the Housing part 1 sucked air into an at least 10% proportion of dirt-saturated air and a remaining proportion relative purified air. The relatively purified air is fed back to the fan or compressor 9, so that there is an air cycle. The dirt-saturated air is sucked out of the pre-separator 17 and one second cleaning device supplied before it is released to the atmosphere. This is what the in

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Fig. 2 indicated blower 18 and the cleaning device 19, which is a cyclone ' can.

The housing part 2 houses collecting devices and screening devices for the first to third partial flow. The sieve devices, which are described in detail below, are combined to form a sieve block 20, which is made to vibrate by means of an unbalance drive 22. That in the first substream "I through the grate 7 falling material hits a collecting surface arranged in the housing part 2 under the grate 23, which directs the first partial flow I to the feeding end of a first scroll screen 24. The roll sieve 24 is designed so that the grains and the fine-grained impurities through the sieve fall into a collecting funnel 25 while the rolls remain on the sieve surface. A channel 26 connects the collecting funnel 25 to a cleaning sieve 27. The fine-grained ones fall through this cleaning sieve 27 Impurities, primarily sand, through, while only the good grain that is being sought Remains on the sieve and passed through a channel, not shown in detail, to the useful material outlet 28 can be. 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 22 caused vibrations from the screen inlet side Hike to the lower side of the sieve outlet and over the edge of the sieve into appropriate collecting devices or Canals fall.

The second partial flow II is between the collecting and guide surfaces 29 collected and passed to a second scroll screen 30. The second scroll screen 30 is in

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the same inclined plane as the first scroll screen 24 and directly adjoins this. Under the Roll screen 30 is again a collecting funnel 32, which the portion cleaned of rolls of the second partial flow and leads to a distribution device 34 via a further channel 33. The distribution device 34 distributes the second partial flow evenly over three arranged one below the other Sorting sieves 35, which match in structure. The distribution device 34 will be explained later with reference to FIG. explained in more detail. The sorting sieves 35 are constructed so that only good grain grains on the sieve surfaces remain while weaker cereal grains and fine-grained impurities pass through the sieves fall into collecting trays 36 arranged below. The good grain falls over the lower-lying edges the inclined sorting sieves 35 in a channel 37 and This also arrives at the usable material outlet 28. The material collected in the collecting trays 36, which is in consists primarily of weaker grain, is a second outlet via a further channel, not shown 38 supplied and can be used as a second choice material, e.g. B. be used as feed grain or the like.

25th

Since the first substream I comprises one third to one half of the grain content of the first fraction A, stands for the remaining grain portion in the second partial flow II is provided with a large screen area for sorting.

The sorting can therefore be carried out much more efficiently and faster than if the division in the substreams I and II would not have taken place and the entire first fraction A of a sorting sieve should have been subjected. Since the first partial flow I based on the choice of the position of the peeling plate 15 the grain quality already has the desired high purity

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Has a degree of unity, the cleaning sieve 27 does not need any Sorting but only to carry out a cleaning. The sieve performance of the cleaning sieve, i.e. the amount of material to be fed per unit area and time can therefore be very much less than that of the sorting sieves 35. Of the Larger part of the space available within the device can therefore be used with sorting sieves Creation of the largest possible sorting screen area occupied will. The high screening capacity achieved in this way ensures that the second partial flow is properly processed good and weaker grain is sorted.

Fig. 3 shows enlarged a 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 their collecting trays 36. Sieve cleaners 39, which are made from rubber balls 40, can be seen under the sieves 27 and 35, respectively exist, which are held in a cage 42 so that they open during the oscillating movement of the sieve unit and dance. This dancing rubber balls 40 hit against grains or stones or the like, which are may have jammed in a sieve opening. The screen cleaners are designed to prevent them from falling through of the parts passing through the sieves 27 and 35 into the collecting trays 38 and 43, respectively.

Fig. 4 shows in a partial longitudinal sectional view according to the line IV-IV in Fig. 3, the distribution device The distribution device 34 has over the length of the

■ ^: 30 device distributed alternately high-level collecting

floor 44. That in channel 33 evenly over the length of the Device falling material therefore meets the highest collecting floor 44 in a longitudinal section and in the adjacent one Longitudinal section on the middle collecting tray 44 and in the next but one longitudinal section on the lowest one Collecting tray 44 on. over the length of the device

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summed up, the same amount of material hits the uppermost collecting trays 44 as the middle and the lowermost collecting trays 44. The material falling on the uppermost collecting trays 44 is delivered to the uppermost sorting sieve 35, while the middle collecting. } bottom the middle sorting sieve and the lowest top |

Load the bottom sorting sieve with traps. f

As already stated earlier, the in the Windaus-. $ Reading device with the air flow entrained second |

I Fraction B, depending on the quality of the abandoned goods, still contain § a not inconsiderable portion of usable grain, but at least weaker grain that can be used as feed grain. This part of the second fraction B is heavier than the light impurities and is therefore deposited as a third partial flow III at the bottom of the expansion space 16. This third partial flow falls from an opening in the floor of the expansion space onto a collecting surface 45 underneath. The collecting surface 45 leads the material of the third partial flow III to the feed side of a third scroll sieve 46. The third scroll sieve 46 closes in the same plane as the first two scroll sieves 24 and 30 to the latter. In this way, the three scroll screens form a plane that is slightly inclined with respect to the horizontal, at the highest end of which the heaviest scrolls and at the lowest end the lightest scrolls remain on the screen surface. As already stated, s migrate due to the inclination of the screen surface in connection with | with their oscillation, the rolls from the higher end of the sieve or sieve to the lower one, in order to finally fall over the lower end edge of the third roll sieve 46 into a channel 47. The channel 47 leads the rolls to a waste outlet, not shown in detail. At the same time, the fine-grained impurities that are removed with the help of

- 24 -

of the cleaning sieve 27 were sieved out of the first partial flow I and collected by the collecting tray 43. ■ -The the portion of the third partial flow III which passes through the third scroll sieve 46 is passed through a sorting sieve 48, which is located directly under the third scroll screen. Remain on the sorting sieve 48 Cereal grains lie, which at least in terms of size are to be counted as good grain. This grain which also falls into a further channel 49 due to an inclination of the sieve 48 can, depending on the result of a Test can be brought either to the useful material outlet 28, to the second outlet 38 or back to the material inlet 3. the Quality of the grain collected in channel 49 depends on the type of goods delivered, so the decision must be made for one of the three alternatives mentioned depending on the individual case. That from a drip tray 50 under the sorting sieve 48 collected goods, which primarily consist of weaker grain and possibly fine-grained Contamination is present, the second outlet 38 for material is second via a channel, not shown Choice fed.

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 much smaller than the total area of the sorting sieves with the same sieving performance 35 can be.

Below the air outlet 5, a pipe 52 opens into the housing part a. The pipe 52 is via an elastic connecting member 53 with suction pipes 54 and 55 inside the Screen block 20 connected, whereby a dedusting of the screen block is achieved. A window 56 within the Housing part 1 enables in connection with a lamp 57,

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to observe the function of the wind readout device from the outside. This will make the optimal setting of the adjustable Wind reading parts facilitated. The screen cleaners 39 provided for each screen are shown in FIG. 2, respectively only hinted at.

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Claims (31)

Patent attorneys Dipl.-Ing. H. Weickmann, Dj (1pl.! - PhυΗ ·. £ Κ · | K.! Bii ^ ec Dipl.-Ing.FAWeickmann, Dipl.-Chem. B. Huber Dr. Ing.H. Liska 8000 MUNICH 86, DEN 9,; 5θΡί | 98Q POSTFACH 860 820 MÖHLSTRASSE 22, CALL NUMBER 98 3921/22 Happle GmbH & Co. Maschinenfabrik Postfach, 7912 Weißenhorn, FRG Device for cleaning and sorting grain, seeds or similar other useful goods 1. Apparatus for cleaning and sorting grain, seeds or the like comprising other useful goods a wind reading device with an essentially horizontally arranged grate, this grate with essentially air supply directed vertically upwards from below and one in the area of a feed end of the Arranged grate, directed over the grate away feed supply, further comprising one above the grate ending discharge for a second fraction, namely light contaminants such as peel and straw as well as air flow containing weaker useful material and a separating device assigned to the grate for the subdivision one freed from this second fraction, containing the essential part of the good useful goods first fraction into two substreams, a first substream closer to the feed end of the grate and one the Feed end of the grate further second partial flow, as well as first and second collection and continuation devices for the first or the second partial flow, characterized in that the separating device consists of a peeling plate (15) arranged in the horizontal direction of flow of the feed material behind the grate (7).
5 2. Apparatus according to claim 1, characterized / that the peeling plate (15) is one of the Curvature of the flow of material in this area has a corresponding shape. 3. Apparatus according to claim 1 or 2, characterized that the peeling plate (15) is approximately at the level of the grate (7) at its end remote from the task is arranged. 4. Device according to one of claims 1 to 3, characterized characterized in that the peeling plate (15) is concavely curved as seen from the input end of the grate is. 5. Device according to one of claims 1 to 4, characterized characterized in that the peeling plate (15) protrudes over the top of the grate (7) upwards. 6. Device according to one of claims 1 to 5, characterized in that the peeling plate (15) protrudes downwards over the underside of the grate (7). 7. Device according to one of claims 1 to 6, characterized characterized in that the position of the peeling plate (15) is adjustable. 8. Device according to one of claims 1 to 7, g e characterized by a below the wind readout device (D arranged sieve unit (2). 9. Apparatus according to claim 8, characterized in that the sieve unit (2) is one of the first collection and continuation facility (23 ^ 28) associated first scroll screen (24) with scroll drainage from the top side of the screen and a material collector (25) on the bottom side of the screen. 10. Device according to one of claims 8 or 9, characterized in that the sieve unit (2) one of the second collection and continuation devices (29-28) associated second scroll screen (30} with scroll drainage from the top of the screen and a crop collector (32) on the underside of the sieve. 11. Device according to one of claims 8 to 10, characterized characterized in that the sieve arrangement (2) is a cleaning sieve assigned to the first collecting and conveying device (23-28) (27) with a drain from the top of the sieve and a sieve catcher (43) on the underside of the sieve includes. 12. Device according to one of claims 8 to 11, characterized characterized in that the sieve unit has at least one of the second collecting and conveying devices (29-28) associated sorting sieve (35) with an outflow from the top of the sieve and a sieve catcher (36) on the underside of the sieve. 13. The apparatus according to claim 12, characterized in that a plurality of sorting sieves (35) within a sorting screen block are arranged one above the other. 14. Device according to claims 11 and 12 and optionally 13, characterized in that the cleaning I 1
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1 I. 090960 9-6 transmission sieve (27) is arranged under the sorting sieve (35). 15. Device according to claims 9 and 10, optionally 11 to 14, characterized in that the first and second scroll screens (24 and 30, respectively) in a plane are arranged next to each other. 16. Device according to claims 9 to 12 and possibly 13 to 15, characterized in that the sorting sieve (35) is arranged below a scroll sieve (24, 30). 17. Device according to one of claims 9 to 16, characterized in that the crop discharge ends the sieves (24, 30,27,35) are arranged offset in relation to the feed ends of these sieves in approximately the same direction as the peeling plate (15) opposite the feed end of the grate (7).
20th 18. Device according to claims 11 and 12 and possibly one of claims 13 to 17, characterized in that the material drain from the cleaning Sieve (27) and the drainage from the sorting sieve (35) open into a common first Nutzgutauslaß (28). 19. The device according to claim 18, characterized in that the material discharge from the cleaning supply sieve (27) and the drainage of the sorting sieve (35) connect to a fall channel (37) whose lower end forms the first Nutzgutauslaß (28). 20. Device according to one of claims 13 to 19, characterized in that on the Feed end of the sorting sieves (35) belonging to the second collecting and continuing exercise device (29-28) ti ti possibly to the crop catcher (32) of the second scroll screen (30) downwardly adjoining downdraft distributor (34) is arranged along the feed edges the sorting sieves distributed collecting trays (44), which alternate with the individual sorting sieves (35) are assigned in terms of height. 21. The device according to claim 20, that on the side of the downflow distributor remote from the sorting sieves (35) (34) one of the first collection and continuation devices (23-28) associated, if necessary on the Gutauf catcher (25) of the first scroll sieve. (24) downwardly adjoining feed channel (26) to the cleaning sieve (27). 22. Device according to claims 11 and 12 and possibly one of claims 13 to 22, characterized in that the sieve catchers (43 (36) of the sorting sieve (35) and optionally the cleaning sieve (27) into a second useful material outlet (38) for lead to weaker useful goods. 23. Device according to claims 11 and 12 and possibly one of claims 13 to 22, characterized in that the total screen area of the or of the sorting sieves is considerably larger, up to several times, than the sieve area of the cleaning sieve (27). 24. Execution according to one of claims 1 to 23, characterized characterized in that the discharge for the air stream leading to the second fraction is one Expansion space (16) with an upper air outlet (5) and a bottom opening for in the expansion space (16) has heavy parts of the second fraction separated from the air stream. • t ff · I · I • «t · ■ III t Il • * · ItII 25. The device according to claim 24, characterized in that the bottom opening is optionally below Arranging a collecting surface (45) over a third scroll screen (46) is arranged with a roll drain from the top of the sieve and a material collector (48) on the underside of the sieve. 26. The device according to claim 25, characterized in that the Gutauffänger (48) of Another sorting sieve is formed with an outflow from the top of the sieve and a sieve catcher (50) on the underside of the sieve. 27. The device according to claim 26, characterized by one connected to the crop outlet (at 49) Switching device for the optional connection of the crop drainage from the top of the sieve with the first useful material outlet (28) or the second useful material outlet (30) or with the material feed (3,6) of the grate (7). 28. Device according to one of claims 25 to 27, characterized in that the third Scroll sieve (46) in a plane with the two first and second scroll sieves (24, 30) and then is arranged on the second scroll screen (30). 29. Device according to one of claims 9 to 28, 30 characterized in that at least at least some of the sieves from the end of the feed to the drain the end is inclined downwards. 30. The device according to claim 24, characterized in that g e k e η η, that to the expansion space (16) a pre-separator (17) with a main outlet for Relatively purified air and a secondary outlet for dirt-saturated air connects, with the main outlet is connected to a fan (9) connected upstream of the air supply (8) to the grate (7). 31. Device according to one of claims 11 to 30, characterized characterized in that at least the cleaning sieve (27) and the sorting sieves (35, 48) are at least partially assigned to screen cleaners. i · · · t HII tlt (tC t • · · C (It • · · · · tee t ι ( • ·· ■ CtIC