DE20218820U1 - Sieve assembly for sieving botanical residues prior to composting, comprises an adjustable inclined sieve surface mounted within a frame - Google Patents

Abstract

A sieve assembly for sieving organic wastes (A) prior to composting, comprising an inclined sieve surface (16) mounted within a frame (11), where wastes are placed on top of the frame and are released through the frame, is new.

Description

D - 88639 Wald-Sentenhart Sieving device field of use

&iacgr;&ogr; The invention relates to a screening device according to the preamble of claim 1 which can be used for "rotting, organic waste materials".

State of the art

For the environmentally friendly processing and disposal of decomposable organic waste materials, e.g. branches, bushes and shrubs, old wood from buildings or from transport and packaging, and similar materials, shredders are used to chop up the said decomposable material. The shredded material is preferably stacked into compost heaps.

In order to advance the composting process, the compost heaps are, depending on the state of decomposition, either shredded again or placed in a temporarily stationary mobile shredder and

2-298 G W, : ::2D02-1Uf3j I

PAe Hansmann & Vogeser»<3eppingen**

re-shredded or, if the state of decomposition is already further advanced, so-called turners are used, which usually take the composted material and pile it up to form a new compost heap. If necessary, sieving and re-shredding takes place using mobile sieving devices, whereby on the one hand the processed material, separated according to different degrees of shredding
grain sizes -, piled up on different heaps or put into a compost heap. This is a mobile

A device for sorting compost components by sieving is known from DE 37 34 360 C2, in which the sieving device is a comb roller sieve, the sieving section of which increases from the feed side to the discharge side. A feed hopper is arranged in front of the sieving device, which has a conveyor belt on the bottom. The sieving device and feed hopper are arranged on a common chassis.

Another screening device for compost is known from DE 44 08 187 C1, in which the feed hopper with its bottom conveyor belt is arranged above the screening device. The screening device here consists of a rotating screening belt. The discharge side of the effective screening section of the rotating screening belt is located higher than the feed side, so that an ascending screening section is formed. Below and to the side of the screening section are

2-298 GW ₁ : : :2D02-1Uf3| j

PAe Hansmann & Vogeser»<3öppingen*··*

Conveyor belts are provided to transport the screened material away. As with the previously mentioned device, the drive units of this screening device are also arranged on or at the chassis.

Another screening device is known from DE 36 44 146 C2, in which the screening surface is formed by a drum screen. This screening device is also equipped with additional conveyor belts for transporting away the screened material, the fine grain, and the so-called oversize grain. Due to the design, the feed hopper for the material to be screened is located in front of one of the front sides of the screening drum. The screening drum and the feed hopper are mounted on a common, mobile chassis, on which the drive units are also arranged.

DE 22 26 051 A describes another screening device....

known, in which a storage container with a scraper floor is arranged above an inclined screen surface, with a crumbling roller provided at its discharge. The loosened waste is fed onto the top of the screen surface and conveyed downwards in the direction of the screen to the discharge of the screen surface, whereby during the screening the fine grain falls onto a conveyor belt arranged under the screen surface and the oversize grain migrates to the discharge. The screen surface in this screening device is designed as a clamping shaft screen in order to

2-298 G w, : ::2002-1-UT3: : ..*

PAe Hansmann & Vogeser«<3eppingen*··* ····

-4-

In particular, when screening so-called heavy waste, this prevents the meshes in the screening surface from becoming clogged if the feed is too fast.

The storage container with discharge device and the crumbling rollers are designed as a structural unit and can be folded away from the screen surface if required, especially for cleaning the screen. If the material to be screened is fed in too quickly and depending on the waste material, this device can also cause the screen to become blocked at least temporarily.

&iacgr;&ogr; meshes of the sieve surface cannot be completely excluded.

In order to meet the most diverse application requirements, individual devices are known, such as shredders, turners and screening devices. Turners are also known in which the milling elements also take on shredding functions or in which other components are assigned to the milling elements for shredding the coarser components of the turned compost material. Such turners therefore combine a turner and a shredder. A further combination of the aforementioned individual devices is not known.

For many reasons, there are a large number of composting sites where the permanent stationing of said individual devices, i.e. shredders, turners and

2-298 GW, : :: 2002-11^1*3: : y

PAe Hansmann & Vogesferl^Seppingen*··* .1..

" :

-5-

Screening devices would be uneconomical. These devices are generally kept by service providers who then drive to the compost sites with the necessary equipment and carry out the necessary work there with their machinery. In addition to effective work performance, the transport required for these individual devices is also an important economic factor.

There is therefore a constant need on the market for equipment that is, on the one hand, more cost-effective and efficient in terms of the respective work, i.e. shredding, moving and screening, and, on the other hand, more effective in terms of the required transport effort.

Task
The object of the invention is therefore to provide a

Sieving device for the processing of rottable, ...»

·· * to create a system for the disposal of organic waste material of the type described above, which is simple in its structure, enables economical work and requires little transport effort or a small transport volume for relocation between different work sites or locations.

Solution to the problem/essence of the invention

The object of the invention is achieved by a screening device according to the features mentioned in claim 1

2-298 G w, : :: 2002-1 i-.f3: :

PAe Hansmann & Vo<jesfer?<3öppiH§efT··*

&bull;
&bull; &bull;&bull;&bull;&phgr;
&bull;
&phgr; * &bull;
Φφ
Φ. &phgr;
ϕ* ϕ «·» * %f I &bull;Φ; &Phi;« ·· ·· · &bull; &bull; ··«

solved, the subordinate claims 2 to 21 disclose further developments and advantageous embodiments of the inventive basic idea; with regard to the technical details (features), reference is made to these subordinate claims.

The core idea of the invention is primarily that the sieve surface of the sieving device is variably adjustable in its inclination and the sieving device can be adjusted if required only by

&iacgr;&ogr; minor structural additions to both a shredder

or converter or on a mobile _{# #}

Chassis can be placed or as a stationary knock sieve .* I

is executable. *

The new screening device stands out from known devices in that the screening device can be connected as an additional device to a shredder or converter of known design, with the feed side of the screen being higher than the discharge side, so that an inclined screening surface is created and the discharge end of the screen is arranged in front of the higher feed end when viewed in the working direction of the screening device. The use of the drive units and drive media for the drive units of the screen is advantageous.

2-298GW, : ::2002-1 &igr;-.&idiagr;3: : .· : .··. .··. y : j

PAe Hansmann & Vo<3eefer?Äöppin$en*..*.!.· .i. *..* *..*.:..*..*

-7-

According to the invention, the uniform distribution of the material in the upper part of the screen is further improved by the fact that the material leaving the shredder or converter at the discharge of the discharge belt is fed onto a distribution shaft.

In addition, a further development provides for knockers to be assigned to the sieve surface of the sieve from below, whereby the sieving process can be influenced in a material-related manner by controlling the knocking frequency.
&iacgr;&ogr; Preferably, the knockers are hydraulically infinitely adjustable.

In conjunction with the newly provided inclination adjustment of the screening surface, an even better influence on the screening process can be achieved compared to known designs of screening devices.

The non-sievable material (oversize grain) that arises during screening and leaves the screening surface at the discharge end is either discharged laterally via another conveyor, often referred to as a side conveyor, or, depending on the intended procedure, is fed either directly or via another belt or a screw conveyor to a mechanical shredding process, or is used as a "windrow core" according to another process sequence, which is then covered by the sieved medium or fine grain.

2-298GW, i : 3*02-11-13: : .· : _: " _{: :} : · : : :..: .:.

PAe Hansmann & Vogesifr.tGäppingfen *.·'

I »iijV · ··; ··* :·&igr; *·

-8th-

A second embodiment of the invention is particularly addressed in the subordinate claim 17 and a third preferred embodiment in the subordinate claims 18 to 21.

The main advantages of the new screening device are

- that the screening device can be carried along with a shredder or turner and no additional

&iacgr;&ogr; Transport is required, as is the case when using a

drum sieve would be necessary;

- that when the fraction of the waste material to be processed changes, a quick change of the

screening device is possible;

- that the hydraulic drive devices present on the shredder or converter can also be used to drive the screening device;

20

- that the compact design does not require dismantling for transport;

- that the large screening surface enables high screening performance even with moist material (no lump formation);

2-298GW, : :&ogr;&thgr;02-&igr;&iacgr;-&idiagr;3: : .· : .". :*:

PAe Hansmann &Vogeger,S3öppin9fe" *··*··

- that the sieve mesh is easy to change;

- the fact that shredding and screening can be carried out in one operation results in significant cost savings;

- that grain sizes can be adapted to customer requirements.

Examples of implementation

&iacgr;&ogr; The invention is described in more detail below using embodiments, the drawings showing schematic representations. They show:

Fig. 1 a new screening device attached to a shredder;

the fig.

2 to 4 in plan view and in front view the arrangement of the sieve surface within the sieving device;

Fig. 5 the new screening device mounted on a

mobile chassis
and
Fig. 6 the new screening device in the form of a stationary tap sieve.
The reference number 1 in Fig. 1 designates a mobile shredder or

2-298 G w, : :£θ&ogr;2-&igr;1-\3: : .· : _:: ::.·

PAe Hansmann & Voge?f!r,y3öppingfen *.·*

-10-

A converter is indicated which moves in the working direction "R". On its 1 rear side, a discharge unit 2 is provided which can be pivoted about an axis 8 and is held in place by means of an inclination lock 7. This discharge unit 2 contains a discharge belt 9 which conveys shredded waste material "A" in the discharge direction 6 to the discharge point 3 at the top.

Behind and partly below this discharge unit 2 is the new screening device in its first version 10

β is arranged, which is pivotably mounted in the discharge-side section by means of its joint part 13 on a joint piece 4 of the discharge unit 2. At the discharge-side end of the frame (base body) 11 of the screening device 10, bearing plates 15 are provided, preferably on both sides, which, viewed from the outside of the body, are connected to a transversely arranged rod 15', whereby this rod 15' is movable within predetermined tolerances. With this counter bearing, consisting of the parts 15 and 15', the screening device 10 is supported on the discharge unit 2, so that the screening surface 16 (screen mat) is arranged inclined from the feed to the discharge; details of the screening surface 16 are shown in Figures 2 to 4.

The vibrations emanating from the shredder or converter 1 during travel and transmitted to the discharge unit 2 also act on the screening device 10.

2-298GW, : · 52902-1145: : .* · : : ::.· :: : : j,

PAe Hansmann & Vogesöl-'QöppindbR *.·'·&idigr;

&id;&ngr; ··

-11 -

Due to the fastening and pivoting mounting of the screening device 10 on the discharge unit 2 as described above, the vibrations are also transferred to the screening device 10, which is what is intended. These vibrations act on the screening surface 16 like a shaking or knocking device.

Depending on the intended application, the novel screening device 10 can also have a knocking group 20 arranged below the screening surface 16 and supported on the frame 11.

&iacgr;&ogr;. Knockers 22 are provided on arms mounted about rotation axes 21, which rest against the screen surface 16 from below. Figure 1 shows two such arms, which are coupled to one another via a connector 24. One of the two arms is designed at one end as a drive rod 23 and can be driven by the or one of the drive units of the shredder or converter.

In a further development of the invention, a distribution roller 25 is provided on the feed side above the screen surface 16, which is mounted on the frame 11 of the screening device 10, preferably on its side walls 12. The more or less shredded waste material "A" coming from the discharge 3 is evenly distributed by this distribution roller over the width of the screen surface 16 and at the same time loosened; a type of pre-screening thus takes place.

2-298GW, : ; ·2β02-&igr;1-&idiagr;8: : y : _: ^# ' _{: :} * : .· : : : _># : _# :.

PAe Hansmann & Vogpg^r.iGäppinö^n'··* ·&idigr;·· ··· *·· " **" '*

-12-

The screen surface 16 is held at one end to an abutment 18 and at the other end, on the discharge side, to an adjustable clamping bearing 19 within the frame 11. The tension of the screen surface 16 can be variably adjusted using the clamping bearing 19, i.e. it can be adapted to the material to be screened. By tensioning the screen surface 16 more or less tightly, the mesh size can be influenced, depending on the material used for the screen mat. This is more possible with a very elastic or flexible material.

10

As an alternative to the counter bearing group 15, 15', a spacer 26 can also be provided on the feed side 11', which is preferably adjustable, with a fastening plate 14 being provided on one or both sides of the frame 11 and one or two plates 5 corresponding thereto on the discharge unit 2. The connection between the two is made with a

&agr; flexible material, e.g. a rope, a chain or the like

Material. In the case of a particularly compact design of the screening device 10, this type of counter bearing is more advantageous; the forces acting on the bearing and the other components of the frame 11 are lower here than in the design with the counter bearing 15, 15' provided on the discharge side.

The new screening device 10 also ensures, among other things, that the fine grain "FK" in the working direction "R" of the shredder or

2-298Gw, : :·2θ02-&igr;&igr;-&idiagr;8: : .· : _: " _: ::.·:: : : .:.

PAe Hansmann & Voges^r,:eüppin^n *··*"

I ¹ IiIv · ··· ··· :·&igr; ·

-13-

As seen from the side of the converter 1, the coarser grain, the medium grain "MK", falls out at the rear of the screen surface 16 and the coarser grain, the medium grain "MK", falls out at the front in the working direction, corresponding to the inclined screen surface 16 pointing forwards on the discharge side, and forms the lower and inner part of the piled up waste heap, which is then covered by the fine grain "FK".
This type of stacking, the formation of the waste pile, is advantageous for the rotting process in many ways. In a screening device with an ascending screen surface, viewed from the feed side to the discharge side, this would be exactly the opposite, the pile formation would begin at the bottom and inside with the fine grain, onto which the coarser grain would then be thrown.

In Figures 2 to 4, the arrangement and mounting of the screening surface 16 in the frame 11 of the screening device 10 is shown in detail.

In Figure 3, the screening surface 16 is designed in one piece and is held between the front sides 11' and 11" and tensioned in the conveying direction "F", i.e. in the longitudinal direction "SL". The components 17, 17' and 193 of the tensioning device are shown here.

The clamping device can be seen in more detail in Figure 2.

On the feed side 11', an abutment 18 is provided in the frame 11 of the screening device 10 and at the other end, i.e. on the discharge side 11", an adjustable clamping bearing 19. The

2-298GW, : : j2eo2-i1-i&: : .· : .* ^# _: :*:.·:: : : .·.

PAe Hansmann & Vogp£pr,:GftPPin0an *··* · ^: ·· ·«'··*

-14-

The clamping bearing 19 consists of a movable leg 191, which can be pivoted about a tilting axis 194 relative to the discharge-side front side 11" of the frame 11 by means of a threaded bolt 192 and a nut 193. The screening surface 16 is equipped on both of its front sides with an angle strip 17 or 17', with which it can be suspended from the abutment 18 or the clamping bearing 19.

The side parts (walls) of the frame 11 are designated with 12. Between the two opposite side walls 12 and below the screen surface 16, one or more ribs 12' are provided on the front and/or side to support the screen surface 16.

Figure 4 shows that the screen surface 16 can also be made up of several parts if required. Depending on the intended use, these screen surfaces 161, 162 and 163 can each have a different grain size. In this embodiment, the tensioning of the screen surface(s) 16 is preferably carried out transversely "SQ" to the conveying direction "F", whereby the tensioning state can be different for each "partial" screen surface 161 to 163.

In Figure 5, the screening device is shown in a second embodiment, namely as a screening device 30. On a chassis 31, by means of a bearing block 36, the

2-298Gw, : :£&THgr;02-&igr;&Tgr;-&idiagr;3: : .· : .". ::.·:: : : .·.

PAe Hansmann & Vogesei-.JSöppingbr»'··'

-15-

The frame 11 containing the screen surface 16 is pivotally mounted and is supported by a height adjuster 37. This height adjuster 37 is telescopic so that the inclination of the screen surface with respect to the horizontal - the floor surface - can be variably adjusted. This is indicated in this figure by the dashed representation of the frame 11. The dashed position of the frame 11 can also be

^k Transport position if a certain transport height

As far as the transport height is not

&iacgr;&ogr; arrives, this screening device 30 can be carried out with a steeper rising frame 11, thus also in the last working position.

Another special feature of this embodiment is that the waste material "A" coming from a shredder or converter or waste material fed from a storage bunker is fed into one of the

&agr; delivery side of the frame 11 upstream conveyor 32

and is fed by this to a centrifugal roller 33, which centrifuges the waste material "A" onto the upper feed. Drive units 38 are arranged on the chassis 31, preferably on the front side, in front of or next to the conveyor 32. These drive units 38 can also be used to operate the height adjuster 37. During this centrifuging, the waste material is also pre-screened. Larger and heavier components, i.e. in the

2-298GW, &Ggr;*: &EEgr;&thgr;02-&igr;1-&igr;&dgr;: ·" . ^: ': \"\ _: "; .·':/: i..· J.

PAe Hansmann & Vogggpr.jGflppinöbn *··*···· ··· ·* **

-16-

As a rule, the so-called oversize grain "ÜK" falls onto the screen surface 16 more quickly than the smaller, finer components, the fine grain "FK". If necessary, the side walls 12 of the frame 11 shown in Figures 2 to 3 can be raised further here, at least in some areas, in order to prevent or contain the spun waste from drifting sideways.

The oversize grain "ÜK" that falls out at the discharge is preferably deposited sideways by means of the discharge conveyor 34 provided on the chassis 31. If the fine grain "FK" is to be deposited sideways, a pivotably mounted conveyor belt 35 can be provided on the feed side 11' below the frame 11.

A third variant of the screening device is shown in Figure 6. This screening device 40

is also the one already described in Figures 1 to 4, in · · ·

The inclined screening surface is stretched across the frame 11. The frame 11 is supported against the ground by feet.

On the delivery side 11", i.e. lower down, a support 45 is provided which has an extendable part. The extension can be done continuously or in locking steps.
The support 46 provided at the other end, i.e. on the feed side, has a lower, foldable part 46'. This part 46' is e.g.

Can be folded in folding direction 47 for transport purposes.

PAe Hansmann &Voggg^iGöppin0&a ·..*·"· · ^: · *

On the feed side 11', i.e. at the top, a storage container 48 is placed on the frame 11 of the screening device 40. In a preferred embodiment, this container has at least one movable (slidable) side wall 48'. For the purpose of defined feeding of waste material "A" to the feed of the screening surface 16, a metering roller 41 is provided in the storage container 48, which is driven by a drive 42 and a flexible transmission element 44, e.g. a chain or belt. The arrow shown to the side of the metering roller 41 indicates the

&iacgr;&ogr; selected direction of rotation of the metering roller 41.

As with the first embodiment of the screening device, here too the screening surface 16 is assigned a knocker 22, which is symbolically indicated by the two knocking arms shown. The knocking arms are connected to one another by a connector 24. A knocking arm is also provided with a drive rod 23, one end of which is connected to the drive 42 by means of a crank rod. In this embodiment, the drive 42 simultaneously operates the metering roller 41 and the knocking group. Not shown here is a further embodiment which consists in the fact that the crank rod 43, which essentially carries out a translational movement, is also operatively connected to the movable side wall 48' of the storage container 48, so that this side surface 48' is moved back and forth, which is advantageous for the waste material "A" to slide down into the storage container 48.

2-298 G w, : :swo2-i1-i&: : .· : ."· ::.·:: : : .·.

PAe Hansmann & Vogpß^r,:GßppinÖfeß *··*·"· · ^:

In this version of the new screening device, the grain groups of the screened waste material are accumulated in different heaps "FK", "MK" and "ÜK".

All features mentioned in the above description as well as those that can be inferred from the drawing alone are further components of the invention, even if they are not particularly emphasized and in particular not mentioned in the claims.

The invention is not limited to the embodiment described, but is variable in many ways within the scope of the disclosure.

2-298GW,

&Rgr;&Agr;&thgr; HsnSmSnn f*~ ^/ ^λλgr; ^° ⁰ · J^Kr»r\innAn · .· _&idigr;-- ·*· *·· ·· ···· **

List of reference numbers

1 shredder or converter (mobile)

2 Discharge unit

3 Drop (on top)

4 joint pieces

5 Plate

6 Discharge direction

7 Tilt adjustment at position 1
&iacgr;&ogr; 8 Pivot point

9 Discharge belt

10 Sieving device (first version) · _#

11 Frame (base body) ** '* 11', 11" Front sides of item 10 (feed side; discharge side) ·.·.!*

12 side walls l·""

12' ribs ·'*";

13 joint parts \'* _t ,'

14 Mounting plate

15 bearing plates
15' Rod

16 Screen mat (rectangular area)

161, 162, 163 Screen mats (each with a different mesh size,

rectangular areas)

17, 17' angle strips

18 Abutments

2-298 G w, : : £oo2-if-ij5 : ·' .· : .**· :*': .·': :

PAe Hansmann & Vogler, &Ggr;"" ¹ &mdash;*- · · · .:.·

-20-

19 adjustable clamping bearing

191 thighs

192 threaded bolts

193 Mother

194 Tilt axis

20 knock group

21 Rotation axis

22 knockers

23 Drive linkage &iacgr;&ogr; 24 Connector

25 Distributor roller

26 adjustable spacer ······

27 side conveyors

30 Sieving device (second version)

31 Chassis (mobile)

32 Sponsors

33 centrifugal roller ;·. :

34 discharge conveyors

35 Conveyor belt 36 Bearing block

37 Height adjuster, telescopic

38 drive units

40 Sieving device (third version)

41 Dosing roller 42 Drive

2-298 G w, : : 6002-1-f-1.5 : : .· : ." _: ::.·:: : :

PAe Hansmann & Vog4§ef,J3öppingfea *..* .&Idigr;·· ."*··'

e«

-21 -

43 Crank rod 44 Chain for belt (flexible over 45 Support (extendable) 46 Support (foldable) 46' Folding part A Waste material F Conveying direction FC Fine grain stack ÜK Oversize MK Medium grain (variable grain size) R Working direction from Pos. 1 S Tension direction SL Tension direction longitudinal SQ Clamping direction transverse

2-298GW, ryjoK-if-ts:··: \: 1 X >\'?\\

PAe Hansmann & Vog4sef,J5pppingen *.

Claims (21)

1. Screening device for rottable organic waste materials (A) with an inclined screen surface ( 16 ), the latter ( 16 ) being positioned in a frame ( 11 ) - base body - and having an upper feed and a lower discharge, characterized in that the inclination of the screen surface ( 16 ) is adjustable. 2. Sieving device according to claim 1, characterized in that the frame, the base body ( 11 ), is pivotally mounted about an axis. 3. Screening device according to claim 2, characterized in that the said (pivoting or tilting) axis is provided on the foot-side section of the frame ( 11 ). 4. Sieving device according to at least one of claims 1 to 3, characterized in that the sieve surface ( 16 ) is held on the frame ( 11 ) by means of tensioning elements ( 19 ) and its tension is adjustable. 5. Screening device according to claim 4, characterized in that the clamping elements ( 19 ) provided on or in the frame ( 11 ) for the screening surface ( 16 ) are adjustable longitudinally to the conveying direction "F" of the waste material. 6. Screening device according to claim 4, characterized in that the clamping elements ( 19 ) provided on or in the frame ( 11 ) for the screening surface ( 16 ) are adjustable transversely to the conveying direction "F" of the waste material. 7. Sieving device according to at least one of claims 1 to 6, characterized in that the grain size of the sieve surface ( 16 ) is variable. 8. Screening device according to at least one of the preceding claims, characterized in that the screening surface ( 16 ) is divided into several sections ( 161 , 162 , 163 ) arranged next to one another in the conveying direction "F". 9. Screening device according to claim 8, characterized in that each of these sections ( 161 , 162 , 163 ) has a different grain size. 10. Screening device according to at least one of claims 1 to 9, characterized in that a roller ( 25 ; 41 ) for distributing and loosening supplied waste material (A) is assigned to the screening surface ( 16 ) on the feed side. 11. Sieving device according to at least one of claims 1 to 10, characterized in that a knocking group (20 ) acting on the sieve surface (16 ) is provided below the latter. 12. Screening device according to claim 11, characterized in that the frame ( 11 ) holding the screening surface ( 16 ) is arranged behind and below a discharge unit ( 2 ) of a shredder or converter ( 1 ). 13. Screening device according to claim 12, characterized in that a counter bearing ( 15 , 15 ') is provided on the delivery side of the frame ( 11 ), which is supported on the discharge unit ( 2 ) of the shredder or converter ( 1 ). 14. Screening device according to claim 12, characterized in that on the feed side the frame ( 11 ) is connected to the discharge unit ( 2 ) by means of a preferably adjustable spacer ( 26 ). 15. Sieving device according to at least one of claims 1 to 11 or according to claim 12, 13 or 14, characterized in that the sieve surface ( 16 ) is supported by means of ribs ( 12 ') arranged in the frame ( 11 ). 16. Sieving device according to at least one of claims 1 to 11, 15 or according to claim 12, 13 or 14, characterized in that the sieving surface ( 16 ) is suspended at one end with its angle bar ( 17 ) on an abutment ( 18 ) and at the other end with an angle bar ( 17 ') in an adjustable clamping bearing ( 19 ). 17. Screening device according to at least one of claims 1 to 11, 15 or 16, characterized in that the screening device ( 30 ) comprises a mobile chassis ( 31 ) on or at which a conveyor unit ( 32 , 33 ) is provided for the purpose of feeding the waste material (A) to the upper feed side of the screening surface ( 16 ), and that the frame ( 11 ) pivotably mounted on a bearing block ( 36 ) is supported by a telescopic height adjuster ( 37 ) which preferably engages the frame ( 11 ) on both sides. 18. Screening device according to at least one of claims 1 to 11, 15 or 16, characterized in that the screening device ( 40 ) has extendable supports ( 45 ) at one end of its frame ( 11 ) and foldable supports ( 46 ) at the other end of the frame ( 11 ). 19. Screening device according to claim 18, characterized in that a storage container ( 48 ) with an integrated dosing roller ( 41 ) is placed on top of the frame ( 11 ). 20. Screening device according to claim 18 or 19, characterized in that a knocking group ( 22 , 23 , 24 ) is provided below the screening surface ( 16 ), which can be driven by a drive ( 42 ) via a crank rod ( 43 ), the latter ( 42 ) simultaneously being the drive for the metering roller ( 41 ). 21. Screening device according to claim 19 or 20, characterized in that the feed hopper ( 48 ) is equipped with a movable wall, which is preferably also coupled to the same drive ( 42 ).