EP3746231B1 - Screening device - Google Patents

Description

The invention relates to a screening device according to the preamble of claim 1.

Such screening devices are characterized by the use of flexible screen linings that are alternately compressed and stretched and are used wherever conventional screening devices with rigid screen linings clog and stick.

In order to compress and stretch the screen linings, each screen lining of the screen surface, which is built up by several screen linings, is clamped between two cross members that usually run transversely to the screen surface. One of these two cross members is part of a first oscillating body, the other cross member is part of a second oscillating body. The two vibrating bodies vibrate relative to each other and out of phase, which causes the compression and expansion of the screen linings.

In order to set the cross members of the two oscillating bodies vibrating, they are connected to one another at their ends via a connecting component, ie. one ends of the first cross member and the other ends of the first cross member of the first oscillating body are connected to one another. In addition, the one ends of the second cross member and the other ends of the second cross member of the second oscillating body are connected to one another. The connecting component is usually a sieve cheek of a sieve box. One screen box is resiliently and thus swingingly mounted on a machine foundation, while the other screen box is supported resiliently or elastically on the screen box mounted on the machine foundation.

A drive, usually an unbalanced drive, sets one of the screen boxes and thus a vibrating body to vibrate, so that the other screen box also vibrates. The resilient or elastic mounting of one screen box on the other is coordinated in such a way that the two screen boxes (oscillating bodies) oscillate out of phase and in opposite directions.

Such a screening device is, for example, from DE 1 206 372 famous. This consists of two oscillating bodies in the form of sieve boxes. Each oscillating body comprises a screen box as well as cross members rigidly connecting the two screen cheeks of the screen box. In order to enable the relative movement of the first cross members of the first oscillating body relative to the second cross members of the second oscillating body, one oscillating body is resiliently mounted on the other oscillating body and is made to vibrate by means of a drive. Both oscillating bodies are set up on a foundation in a resilient manner.

The structure from DE 24 25 953 known screening device. There, too, the screen boxes, which have the cross members and are movable relative to one another, are jointly mounted directly on a machine foundation via spring elements.

From the AT 379 088 B1 it is also known to connect the cross members of one of the oscillating bodies to one another via so-called push rods. These are elastically mounted on the screen cheeks of the screen box of the other oscillating body and can thus oscillate in opposite directions and out of phase with respect to these in the direction of the screen surface. The screen box is vibrated by a drive and the entire system is mounted on a machine foundation, vibrating via springs.

The problem with these known screening devices is the large oscillating masses that result from the fact that one or both oscillating bodies consists in principle of a complete screen box, the screen cheeks of which are connected to one another by means of rigid cross members. In order to generate the vibration of the crossbeams required for compressing and stretching the sieve mats, at least one of the sieve boxes has to be made to vibrate. Due to the high mass of a sieve box (up to 30t), a correspondingly high amount of energy is required for the drive. In addition, the forces introduced into the machine foundation by the swinging of the sieve boxes are very high, so that this must be dimensioned accordingly generously. This also involves the risk that vibrations introduced into the machine foundation are transmitted to other machines or parts of the building.

Sieve devices are known which avoid this disadvantage by providing a stationary supporting structure on which the two oscillating bodies are arranged so as to be movable relative to the supporting structure and can be caused to vibrate. Such a screening device is for example in U.S. 4,430,211 disclosed.

The disadvantage of this screening device, however, is the fact that the coupling to the stationary support structure on the one hand and the oscillating systems to one another on the other hand is very complex, requires a large number of components and is therefore also maintenance-intensive.

In addition, the known coupling of the two oscillating systems to the stationary support structure is primarily designed to relieve the bearing means, but not to support the sieving while the material to be sieved is being conveyed at the same time. Among other things, this has the consequence that a strong inclination of the sieve surface is required and, in addition, an oscillation of the two oscillation systems at an oscillation angle of 40 ° does not allow effective side sealing of the sieve surfaces, which in turn leads to increased sieve losses.

Another problem of a fundamental nature is the fact that there is generally a higher layer height in the feed area of the sieve surface than in the discharge area. For this reason, it is very often necessary to ensure appropriate material conveyance, especially in the feed area, which is usually achieved through greater screening dynamics with large oscillation amplitudes. Especially with flip-wave screening machines, that is to say screening machines in which the supporting structure is not stationary but is also vibrated and is therefore spring-mounted on a machine foundation, these larger amplitudes can be achieved in a relatively simple manner. In the case of screening machines with a stationary supporting structure, however, a corresponding conveying capacity has to be bought at the cost of an increased machine or screen surface inclination, which at the end of the screening machine, where the material flow has already been greatly reduced due to the sifting out of the fine material, leads to material transport that is too fast and leads to high jumping of the Single grains. This reduces the output of fine material into the fine product. This could be counteracted by reducing the amplitude of the push rods, which in turn leads to a reduction in the material conveyance in the task area and thus to overfilling of the screening machine. It is therefore known from the prior art to make the push rods curved so that their inclination towards the delivery area is reduced. Such a design is, however, structurally complex and cost-intensive in screening machines with a stationary support structure.

It is therefore the object of the present invention to avoid these disadvantages and to provide a screening device in which, on the one hand, the machine foundation is loaded as little as possible, but on the other hand the conveyance of the material to be screened is optimized during screening, with an overall simple structure.

At the same time, it should be possible to achieve a good side seal by means of screen mats raised at the side.

It is a further object of the invention to provide a screening device with a stationary support structure of the type mentioned at the outset, which enables adequate material conveyance in the feed area, but enables a correspondingly reduced material conveyance in the discharge area and is simple in construction.

DISCLOSURE OF THE INVENTION

According to the invention, this object is achieved by a screening device according to claim 1. The dependent claims describe optional embodiments of the invention.

By coupling each push rod of a push rod pair with a push rod of the other push rod pair via shear-elastic elements, e.g. Push rubbers, as well as the simultaneous coupling of each push rod of a push rod pair to the support structure via shear-elastic elements, e.g. Push rubbers, a particularly simple structure of the sieve device can be achieved while at the same time conveying the material to be sieved well. The coupling axis resulting from the use of the elastic elements also enables the support frame, for example. to dimension the feet according to the direction of oscillation.

Due to the exclusively linear, opposing oscillating movement of the two oscillating bodies in the conveying direction of the feed material, optimal side sealing can also be achieved by means of raised sieve mats.

According to the invention, the coupling axes of each shear-elastic element run essentially parallel to the push rods in order to optimally start conveying the material to be screened to adapt the course of the sieve surfaces, which also run essentially parallel to the push rods.

Particularly stable vibration conditions are obtained if, according to a preferred embodiment of the invention, the two vibrating bodies are designed to have the same mass. In particular, if only one drive motor is provided that drives both oscillating bodies, the equality of mass of the two oscillating bodies enables an exact, phase-shifted oscillation, which helps to ensure that no dynamic loads are introduced into the supporting structure. It should be noted that equality of masses in the present case is to be understood as a maximum difference of 7% between the masses of the two oscillating bodies, particularly preferably a maximum difference of 5%.

In a further preferred embodiment of the invention, an eccentric drive is provided which drives both oscillating bodies via the respective push rod pairs. For this purpose, both pairs of push rods are connected to one another via a drive shaft with eccentric bushings and connecting rods. This creates the prerequisites for avoiding the introduction of dynamic loads into the stationary support structure and thus into the machine foundation or the stage of a machine hall.

According to a further preferred embodiment of the invention, it is provided that the eccentric drive is arranged on the first or second push rod pair, which results in a particularly compact design of the screening device.

In this case, in order to avoid dynamic loads that are introduced into the machine foundation or the stage of a machine hall, a further preferred embodiment of the invention provides that the oscillating body not supporting the eccentric drive has a balancing mass to compensate for the additional weight of the eccentric drive to compensate the load-bearing vibrating body.

According to a further preferred embodiment of the invention, it is provided that the stationary support structure supplying and / or discharging system components or means for fastening these system components or dust-sealing system components are attached. In particular, the fact that the supporting structure is stationary and does not move and therefore these system components can be used directly, directly without a gap and thus dust-tight on the supporting structure can be used can be attached. The subsequent attachment of such system components at the installation site can also be simplified or accelerated by attaching means for fastening such system components to the supporting structure, these means preferably being manufactured in one piece with the supporting structure.

According to a further preferred embodiment of the invention, it can be provided that the first and second oscillating system each have groups of cross members arranged one below the other and, for the formation of several mutually extending screen surfaces, screen linings on and between the cross members of groups of the first oscillating system and these associated cross members of adjacent ones Groups of the second oscillation system are clamped. The clamping takes place in such a way that a screen lining is clamped both to an upper cross member of a group of the one oscillating system and to an upper cross member of an adjacent group of the other oscillating system, an additional screen lining to and between further cross members of the two arranged below these upper cross members Groups is clamped, etc. In this way, several sieve surfaces can be formed one below the other, whereby the information below is not to be understood as meaning that a vertically underlying arrangement related to a working position of the sieve device is meant, but rather one in relation to the uppermost cross member is to be understood in a lower height arranged position.

According to a further preferred embodiment of the invention, it can be provided that the cross members of each group are attached to mounting plates which are arranged to run essentially parallel to the supporting structure cheeks. A mounting plate of each group of cross members is located on each side of the screening surface, preferably in the immediate vicinity of the supporting cheek arranged on the same side of the screening surface, the term supporting cheek being understood broadly in the present case. So it is not to be regarded as imperative that a support cheek is designed flat, but it can also be designed in the form of a frame or frame profile and therefore do not have a flat shape in the conventional sense. The cross members of this group are attached to the inside of the mounting plates, that is, to the side facing the screen surface. There is a mounting pin on the outside of the mounting plates, which is connected to a push rod of the same oscillating system. In the case of the planar design of the supporting structure cheek, the connection is made through an opening in this supporting structure cheek.

According to a further preferred embodiment of the invention, a third oscillating body is provided, comprising third cross members and a fourth oscillating body including fourth cross members, with at least one further screen lining each being clamped or clamped between a third cross member and a fourth cross member and the third and fourth oscillating body relative to one another can be made to vibrate in order to alternately compress and expand the further screen linings, the third oscillating body comprising a third pair of push rods on which the third cross members are arranged and the fourth oscillating body comprises a fourth pair of push rods on which the fourth cross members are arranged and the The first pair of push rods and the third pair of push rods and the second pair of push rods and the fourth pair of push rods are elastically and / or resiliently connected to one another.

By providing two further oscillating systems and elastic or resilient coupling of these two further oscillating systems to the two other oscillating systems, screen surfaces with sections of different material conveying capacities can be achieved in a stationary support structure and the fact that different screen dynamics (oscillating amplitudes) in the task area and are required at the end of the screening machine. By appropriately designing the elastic or resilient connection of the first with the third and the second with the fourth oscillating system or by selecting the mass of the third and fourth oscillating system accordingly, the amplitudes of the push rods of the third and fourth oscillating systems can be different from the amplitudes of the first oscillating system and the second oscillation system can be adjusted. The oscillation amplitude of the delivery-side push rods is preferably set smaller than that of the feed-side push rods. It should not go unmentioned at this point that, in principle, further oscillating systems can also be provided in the stationary support structure, which are connected to the third and fourth oscillating systems in the same way as the third and fourth oscillating systems are connected to the first and second oscillating systems.

According to a further preferred embodiment of the invention, it can be provided that one push rod of the first push rod pair and one push rod of the second push rod pair are arranged in alignment with one another and / or that in each case one push rod of the second push rod pair and one push rod of the fourth push rod pair are arranged in alignment with one another, whereby a particularly compact design of the sieve device is made possible and a correspondingly uniformly extending sieve surface formed by the individual sieve linings is formed.

According to a further preferred embodiment of the invention, the third pair of push rods is coupled to the fourth pair of push rods via shear-elastic elements and / or the third and / or fourth pair of push rods are each coupled to the support structure via shear-elastic elements. The advantages of using shear-elastic elements have already been pointed out above.

The elastic and / or resilient connection between the first pair of push rods and the third pair of push rods and / or the second pair of push rods and the fourth pair of push rods can be made, for example, by means of tension-compression springs or by means of shear-elastic elements, depending on the behavior of the third and fourth fourth oscillation system.

According to a further preferred embodiment of the invention, a plurality of stationary support structures as described above can be arranged on top of one another.

BRIEF DESCRIPTION OF THE FIGURES

The invention will now be explained in more detail on the basis of exemplary embodiments as shown in the drawings, in a non-restrictive manner

Fig.1

eine schematische Seitenansicht einer erfindungsgemäßen Siebvorrichtung

Fig.2

eine schematische Schnittansicht einer erfindungsgemäßen Siebvorrichtung

Fig.3

eine schematische Draufsicht auf eine erfindungsgemäße Siebvorrichtung

Fig.4

eine Detailansicht des Schwingantriebs

Fig.5

eine schematische Darstellung zur Veranschaulichung des Schwingungsverhaltens

Fig.6

eine schematische Ansicht aufeinander gelagerter Siebvorrichtungen

Fig.7

eine erste alternative Ausführungsform einer erfindungsgemäßen Siebvorrichtung in einer schematischen Seitenansicht

Fig.8

eine schematische Schnittansicht der ersten alternativen Ausführungsform

Fig.9

eine zweite alternative Ausführungsform einer erfindungsgemäßen Siebvorrichtung in einer schematischen Seitenansicht

Fig.10

eine dritte alternative Ausführungsform einer erfindungsgemäßen Siebvorrichtung in einer schematischen Seitenansicht

Fig.11

eine vierte alternative Ausführungsform einer erfindungsgemäßen Siebvorrichtung in einer schematischen Seitenansicht

It shows:

Fig. 1

a schematic side view of a screening device according to the invention

Fig. 2

a schematic sectional view of a screening device according to the invention

Fig. 3

a schematic plan view of a screening device according to the invention

Fig. 4

a detailed view of the vibratory drive

Fig. 5

a schematic representation to illustrate the vibration behavior

Fig. 6

a schematic view of stacked screening devices

Fig. 7

a first alternative embodiment of a screening device according to the invention in a schematic side view

Fig. 8

a schematic sectional view of the first alternative embodiment

Fig. 9

a second alternative embodiment of a screening device according to the invention in a schematic side view

Fig. 10

a third alternative embodiment of a screening device according to the invention in a schematic side view

Fig.11

a fourth alternative embodiment of a screening device according to the invention in a schematic side view

Fig. 1 to Fig. 3 show schematic views of a screening device according to the invention with a first oscillating body S1 and a second oscillating body S2. Part of the first oscillating body S1 are first cross members 2. Part of the second oscillating body are second cross members 3. The screen surface 4 is inclined to the horizontal, with the feed area for the screenings in Fig. 1 is on the left, but is not specially marked.

The screen surface 4 is formed by a number of screen linings 4a. Each screen lining 4a is clamped between a first cross member 2 and a second cross member 3. The first and last screen lining 4a of the screen surface 4 can be fastened differently for this purpose, ie. does not necessarily have to be clamped between one of the first and second cross members 2, 3. The task of the material to be screened can, for example, be applied to the first screen lining 4a, in Fig. 1 the left-most screen lining.

The end regions of the first and second cross members 2, 3 are each connected to one another via push rods 7a, 7b and 8a, 8b, respectively, with FIG Fig. 1 only the push rods 7a, 8a are visible. The push rods 7b, 8b are located on the rear side of the machine in this view. In Fig. 2 , a schematic front view, all four push rods 7a, 7b, 8a, 8b are visible. It is therefore clear to a person skilled in the art that the first oscillating body S1 includes the push rod pair 7a, 7b in addition to the first cross members 2 and the second oscillating body S2 includes the second cross members 3 and the push rod pair 8a, 8b. The push rods 7a, 7b, 8a, 8b can be, for example, I, H or U profile beams, preferably made of steel.

A supporting structure 1 is used to accommodate the two oscillating bodies S1 and S2. These are movably mounted on the support structure 1 so that they can oscillate with respect to this. The support structure 1 can be designed as a support frame and can thus be individually adapted to any installation location. Thus, not only is the classic form of setting up the supporting structure 1 on a horizontal installation surface, for example in the form of a machine foundation 5 or the floor of a machine hall, possible, but also on a subsurface that runs obliquely to the horizontal. Furthermore, it is also possible to anchor the supporting structure 1 to the side of the vibrating bodies S1, S2, for example in masonry, so that the vibrating bodies S1, S2 are held quasi floating above the floor and / or a collecting container.

In the Fig. 1 to Fig. 3 the classic version of the installation is shown, namely on a machine foundation 5 or the floor of a machine shop. The supporting structure 1 itself is designed as a screen box with supporting cheeks 1a, stiffeners 24 and feet 1b, which represent a possibility of adjusting the inclination of the screen surface 4. Alternatively, the supporting cheeks 1a can also be attached to an inclined foundation so that no feet are required.

It should be noted that instead of the supporting cheeks 1a, frames or frame profiles can also be provided. A flat design of the supporting cheeks 1a is not absolutely necessary.

The supporting structure 1 is supported in the exemplary embodiment according to FIG Fig. 1 stationary on the machine foundation 5 without vibrating itself. The stationary support structure 1 offers the advantage that no energy has to be expended in order to make it vibrate. The drive energy required to operate the screening device according to the invention can be reduced by about 3/4 compared to conventional flip-flop screening devices with resilient mounting on a substrate. The weight of the machine is lighter and the introduction of dynamic forces into the machine foundation is reduced or, with appropriate mass balancing, is completely eliminated, as will be explained in more detail below.

The bearing or coupling of the pairs of push rods 7a, 7b, 8a, 8b to the support structure 1 is carried out by means of shear-elastic elements 10a, in practice often also shear rubbers for short called. These allow an oscillation in the direction of a coupling axis 11, whereas no oscillations occur in different directions, but in any case only such small oscillations that they are negligible when considering the overall oscillation behavior of the oscillating bodies S1, S2. According to the invention, the coupling axis 11 runs essentially parallel to the longitudinal axis of the push rods 7a, 7b, 8a, 8b.

The push rods 7a, 7b, 8a, 8b are supported on the one hand on brackets 9 of the supporting structure 1, but on the other hand also with one another via shear-elastic elements 10b.

If you will, be like in Fig. 1 clearly visible, the pairs of push rods 7a, 7b, 8a, 8b clamped swinging between the consoles 9, with elastic elements 10a being provided between the consoles 9 and the push rods 7a, 7b, 8a, 8b and between the upper pair of push rods 7a, 7b and the lower pair of push rods 8a , 8b also shear-elastic elements 10b are provided.

The vibration excitation takes place via a drive unit 6 with a drive 6c, which is designed as an eccentric drive. In the embodiment according to Fig. 1 the drive 6c is arranged on the oscillating body S2, specifically on the pair of push rods 8a, 8b, the other oscillating body S1 is resiliently coupled to the drive 6c using a shear-elastic element 10c. The motor 6a of the drive unit 6 is arranged on the stationary support structure 1 and is coupled to the eccentric drive 6c via a V-belt or a cardan shaft.

System components 14a, b, c and means 15a, b, c for fastening such system components are shown in dashed lines with material supplying or discharging system components. These means 15a, b, c can be, for example, flanges attached to the supporting structure 1, via which the system components 14a, b, c can be fixedly connected to the supporting structure 1 at predetermined points, so that the supporting structure 1 and the system components are connected form a common sieve system.

The system components 14a, b, c can, for example, serve to supply or remove materials or material to be screened. In the case of the system component 14a in Fig. 1 it is, for example, a feed chute via which the material to be screened can be guided onto the screen surface 4. The system component 14b is a discharge chute through which unscreened material is transported to the screening device. System component 14c is used to set up a supporting structure 1 having supporting structure cheeks 1 a correspondingly inclined and at the same time to discharge the screened material.

Fig. 4 FIG. 4 shows a detailed view of the drive unit 6 from FIG Fig. 1 comprising a motor 6a which can be speed-controlled preferably via a frequency converter and which drives the eccentric shaft 6c via a belt 6b. The vibrating body S1 is connected via its pair of push rods 7a, 7b and connecting rods 6d. In the present exemplary embodiment, laminated wood leaf springs, which are sufficiently flexible and via which the push rods 7a, 7b are moved to and fro in the direction of the arrows 13, act as connecting rods 6d. In principle, however, the use of connecting rods made of other materials that have the required flexibility is also conceivable. Purely by way of example, reference should be made at this point to the possibility of designing the connecting rods 6d as thin-walled steel springs. The material GRP is also suitable for the production of GRP leaf springs with similar properties as the wood leaf springs and can therefore be used as connecting rods 6d in the application example at hand.

The connection of the connecting rod 6d to the connecting rod pair 7a, 7b of the oscillating body S1 is carried out by screwing thrust rubber elements 10c fastened in the profile of the connecting rod pairs 7a, 7b to the connecting rod 6d, either directly or via intermediate plates (not shown).

The connecting rod pair 8a, 8b is connected directly to the eccentric drive 6c, for example by screwing the individual components.

By using the shear-elastic elements 10a, 10b, 10c, an exclusively linear oscillation of the oscillating bodies S1, S2 is guaranteed. This enables the use of laterally raised screen mats 4a, as shown in particular in FIG Fig. 2 can be seen.

Figures 5a to 5c show schematically the movements of the push rod pairs 7a, 7b, 8a, 8b and thus the vibration behavior of the vibrating bodies S1, S2 when a drive 6 is used, as in FIGS Fig. 1 to 4 shown. The screening device is operated in the resonance range with an adjustable operating frequency.

Fig.5a shows the two oscillating bodies S1, S2 in the rest position. The screen linings 4a clamped between the first and second cross members 2, 3 sag slightly. Through the The eccentric drive 6c arranged on the oscillating body S2 is, on the one hand, caused to vibrate via the connecting rod 6d, the pair of push rods 7a, 7b and thus the oscillating body S1. At the same time, the elastically mounted oscillating body S2 also oscillates. Fig.5b shows the push rods 8a, 8b in their - based on the rest position in Fig.5a - Due to the eccentricity "e" of the eccentric shaft 6c, the maximum deflected state by the oscillation amplitude "a". In the ideal case of mutually coordinated masses of the two oscillating bodies S1, S2, the push rods 7a, 7b are deflected in the opposite direction by the same amplitude "a". Starting with the in Fig.5b On the left screen lining 4a, the screen linings are alternately compressed and stretched due to the movements of the pairs of push rods 7a, 7b, 8a, 8b, which are also accompanied by corresponding movements of the first and second cross members 2, 3 and can therefore easily eject plug-in grains that clog the screen openings when screening material is difficult to screen.

The coordination of the masses of the two oscillating bodies S1, S2 to one another has a great influence on the functioning of the screening device. Only when the masses between the two oscillating bodies S1, S2 are equal, the forces cancel each other out when the two oscillating bodies S1, S2 oscillate in opposite phase and cause no dynamic loads to be introduced into the supporting structure 1, which means that it can be dimensioned correspondingly less massive. For a complete mass balance, the extra weight occurring due to the eccentric drive 6 of the oscillating body S2 is compensated for in the oscillating body S1 by a counterweight (not shown). Reference is made explicitly in this context to the explanations given above on the understanding of the term mass equality.

Due to the upsetting and stretching of the screen linings 4a and the inclination of the screen surface 4, the screenings are conveyed from left to right during screening in the embodiment variants shown. In the operating state, the screen surface 4 is inclined by the angle α relative to the horizontal. The angle α is approximately between 5 ° and 25 °, preferably between 10 ° and 25 °, particularly preferably between 15 ° and 20 ° second cross members 2, 3 is considered, since the actual screen surface 4 formed by the screen linings 4a does not form a continuously straight surface.

Fig. 6 shows an embodiment in which two screening devices according to the invention are arranged one above the other, in which the stationary supporting structure of the one screening device is mounted on the stationary support structure of the other screening device. Means for connecting and locking the two supporting structures to one another are not shown. Due to the fact that, given the appropriate dimensioning of the vibrating bodies, no dynamic loads are introduced into the machine foundation, more than two such supporting structures including the vibrating bodies can be arranged one above the other without critical forces on the stationary supporting structures imposing a height limitation.

Fig. 7 shows an embodiment of a sieve device according to the invention in which two sieve surfaces 4 are provided running one below the other without the structural complexity of the sieve device increasing significantly, since only two pairs of push rods 7a, 7b, 8a, 8b are still used.

It must be emphasized at this point that in the exemplary embodiment shown only two screen surfaces 4 are formed, but in principle it is also possible to form more than two screen surfaces one below the other.

The simple, structural design is characterized in that the first and second oscillating systems S1, S2 have groups G1, G2 of cross members 2, 2a, 3, 3a arranged one below the other. Specifically, mounting plates 16a, 16b are arranged on the vibrating system S1 on both sides of the screen surface 4 or the screen linings 4a. A group G1 of cross members, specifically a first cross member 2 and a further first cross member 2a, are mounted on the mounting plates 16a, 16b, one below the other.

It is the same with the S2 oscillating system. A mounting plate 17a, 17b are also arranged on this on both sides of the screen surface 4 or the screen linings 4a. A group G2 of crossbeams, specifically a second crossbeam 3 and a further second crossbeam 3a, are mounted one below the other on the mounting plates 17a, 17b.

Fig. 8 shows on the left side a schematic sectional view through a mounting plate 16a and on the right side a schematic sectional view through a mounting plate 17b.

The groups G1 and G2 are arranged distributed alternately along the screen surface 4, so that a screen lining 4a is clamped both to a first cross member 2 of a group G1 of the oscillating system S1 and to a second cross member 3 of an adjacent group G2 of the oscillating system S2.

In contrast to the Fig. 1 to 3 illustrated embodiment of a screening device according to the invention is in the Fig. 7 and 8th illustrated embodiment, an additional screen lining 4c stretched below the screen lining 4a. The screen lining 4c is clamped to a further first cross member 2a of group G1 and a further second cross member 3a of group G2.

In this way, several sieve surfaces 4 can be formed one below the other.

In the exemplary embodiment shown, the mounting plates 16a, 16b and 17a, 17b run parallel to the supporting structure cheeks 1b. The cross members of a group G1 or G2 are fastened on the inside of the mounting plates 16a, 16b or 17a, 17b, that is to say on the sides facing the screen surfaces 4. On the outside of the mounting plates 16a, 16b or 17a, 17b there are fastening pins 25 which are connected to the push rods of the same oscillating system S1, S2 to which the respective mounting plate is to be assigned. In order to connect the mounting plates 16a, 16b or 17a, 17b via the fastening pins 25 to the associated push rods, openings are provided in the supporting cheeks 1a.

Fig. 9 shows an embodiment of a screening device according to the invention, in which two additional oscillating systems S3 and S4 are provided, which are designed in the same way as the two oscillating systems S1 and S2 and are coupled in the same way to the supporting structure 1 as well as in the same way Way are coupled with each other. In addition, the oscillation system S3 is also coupled to the oscillation system S1 and the oscillation system S4 to the oscillation system S2, namely via resilient and / or elastic elements, preferably via or that is via tension-compression springs (23a, 23b).

Fig. 10 shows an embodiment of the screening device according to Fig. 9 however, with shear-elastic connecting elements 22a, 22b (similar to 10c) instead of the tension-compression springs (23a, 23b), so that according to the in Fig. 1 illustrated embodiment, a purely linear oscillation of the oscillation system S1 and S2 takes place.

Due to the arrangement of the additional oscillating systems S3, S4, all of the screen surfaces 4, 26 can be designed with different material conveying capacities, which does justice to the fact that in the feed area, due to the there The prevailing layer height of the material to be screened requires a higher material delivery rate than in the discharge area.

As in Fig. 4 As shown, the screen surface 4 is formed by the screen linings 4a of the first and second oscillating systems S1, S2 and a further screen surface 26 is formed by the further screen linings 4b of the third and fourth oscillating systems S3, S4.

The connection of the two screen surfaces 4 and 26 takes place via a screen lining 4d.

By appropriately designing the elastic or resilient connection 22a, 22b, 23a, 23b of the first S1 with the third S3 and the second S2 with the fourth S4 oscillation system or by selecting the mass of the third S3 and fourth S4 oscillation system accordingly, the oscillation amplitudes of the Pairs of push rods 20a, 20b or 21a, 21b of the third S3 or fourth S4 oscillation system can be set differently to the oscillation amplitudes of the first oscillation system S1 and the second oscillation system S2. The oscillation amplitude of the delivery-side push rod pairs 20a, 20b, 21a, 21b is preferably set smaller than that of the feed-side push rod pairs 7a, 7b, 8a, 8b. It should not go unmentioned at this point that, in principle, further oscillation systems can also be provided in the stationary support structure, which are connected to the third and fourth oscillation systems S3, S4 in the same way as the third and fourth oscillation systems S3, S4 are connected to the first and second oscillation systems S1, S2.

Fig.11 shows an embodiment in which the screen devices forming the individual screen decks are basically those in FIGS Fig. 1 to 3 the sieve device shown, with the difference that the inclination of the sieve surface 4 decreases with increasing sieve length, as can be seen from the angles a1 and a2 shown, since α1> α2. Correspondingly, the pairs of push rods 7a, 7b, 8a, 8b also have a curved shape. Of course, a single sieve device according to the invention as in FIGS Fig. 1 to Fig. 3 shown have a screen surface 4, the inclination of which decreases with increasing screen length.

It goes without saying that the embodiment with a plurality of stationary support structures arranged on top of one another as in FIG Fig. 6 and Fig.11 also shown for those in the Fig. 7 to 9 illustrated embodiments of the screening devices can be realized.

In addition, it is clear to the person skilled in the art that, through the use of the shear-elastic elements 10a, 10b, 10c, the in the Fig. 6 , 7th , 8th and 10 The embodiments shown benefit from an exclusively linear oscillation of the oscillating bodies S1, S2 or S3, S4 and thereby the use of laterally raised screen mats 4a or 4b is possible.

REFERENCE LIST

1

Support structure

1a

Support cheeks

1b

Feet

2

first cross member

2a

further first cross members

3

second cross member

3a

another second cross member

4th

Sieve area

4a

Screen lining

4b

further screen lining

4c

additional screen lining

4d

connecting screen lining

5

Machine foundation or stage in a machine hall

6th

Drive unit

7a, b

first pair of push rods

8a, b

second pair of push rods

9

console

10a

shear elastic element

10b

shear elastic element

10c

shear elastic element

11

Coupling axis

12th

Direction of delivery

13th

Direction of movement of the push rods

14a

Plant component feeding material

14b

Plant component discharging material

14c

Plant component discharging material

15a

Means for fastening system components

15b

Means for fastening system components

15c

Means for fastening system components

16a, b

Mounting plates for the first cross member

17a, b

Mounting plates for the second cross member

18th

third cross member

19th

fourth cross member

20a, b

third pair of push rods

21a, b

fourth pair of push rods

22a, b

shear-elastic connecting element

23a, b

Push-pull spring

24

Stiffeners

25th

Mounting pin

26th

further sieve area

S1

first oscillating body

S2

second oscillating body

S3

third oscillating body

S4

fourth oscillating body

G1

Groups of cross members arranged one below the other on the first oscillating system

G2

Groups of cross members arranged one below the other on the second oscillating system

Claims (17)

1. Screening device having a first oscillating body (S1) comprising first cross members (2) and
   a second oscillating body (S2) comprising second cross members (3), wherein first cross members (2) and second cross members (3) are arranged alternately and preferably transversely to a screening surface (4) and each have clamping devices
   by means of which screen linings (4a) forming the screening surface (4) are each clamped or can be clamped between a first cross member (2) and a second cross member (3), and first (S1) and second (S2) oscillating bodies can be set oscillating relative to one another in order to alternately compress and expand the screen linings (4a),
   wherein
   the first oscillating body (S1) comprises a first pair of push rods (7a, 7b) on which the first cross members (2) are arranged and
   the second oscillating body (S2) comprises a second pair of push rods (8a, 8b), on which the second cross members (3) are arranged and
   a stationary support structure (1) is provided which accommodates the two oscillating bodies (S1, S2), wherein
   first and second oscillating bodies (S1, S2) can be set in oscillation relative to the stationary support structure (1),
   characterized in that
   the first pair of push rods (7a, 7b) and the second pair of push rods (8a, 8b) are coupled in each case to the support structure (1) via shear-elastic elements (10a) and are coupled to one another via shear-elastic elements (10b), which shear-elastic elements (10a, 10b) each allow oscillation in a coupling axis (11), wherein the coupling axes (11) of each shear-elastic element (10a, 10b) extend essentially parallel to the push rods (7a, 7b, 8a, 8b).
2. Screening device according to claim 1, characterized in that the first oscillating body (S1) and the second oscillating body (S2) are designed to be of the same mass.
3. Screening device according to one of the preceding claims, characterized in that an eccentric drive (6c) is provided which drives both the first pair of push rods (7a, 7b) and the second pair of push rods (8a, 8b).
4. Screening device according to claim 3, characterized in that the eccentric drive (6c) is arranged on the first (7a, 7b) or second (8a, 8b) pair of push rods.
5. Screening device according to claim 4, characterized in that that the oscillating body which does not support the eccentric drive (6c) has a compensating mass in order to compensate for the additional weight of the oscillating body supporting the eccentric drive (6).
6. Screening device according to claim 4 or 5, characterized in that the oscillating body which does not support the eccentric drive (6c) is connected to the eccentric drive (6c) via a connecting rod (6d) connected to a shear-elastic element 10c.
7. Screening device according to one of the claims 1 to 6, characterized in that material-supplying and/or material-discharging plant components (14a, b, c) or means (15a, b, c) for fastening these plant components or dust-sealing plant components are fastened or arranged on the stationary support structure (1).
8. Screening device according to one of the preceding claims, characterized in that first and second oscillating systems (S1, S2) comprise groups (G1 ,G2) of cross members (2, 2a, 3, 3a) arranged one below the other, and screen linings (4a) are clamped on and between the cross members (2, 2a) from groups (G1) of the first oscillating system (S1) and cross members (3, 3a) associated therewith from groups (G2), which are adjacent thereto, of the second oscillating system (S2) in order to form a plurality of screening surfaces (4) arranged one above the other.
9. Screening device according to claim 8, characterized in that the cross members (2, 2a, 3, 3a) of each group (G1, G2) are fixed to mounting plates (16a, 16b, 17a, 17b) which are arranged to extend substantially parallel to the support structure cheeks (1a).
10. Screening device according to one of the preceding claims, characterized in that
    a third oscillating body (S3) comprising third cross members (18) and
    a fourth oscillating body (S4) comprising fourth cross members (19) are provided, wherein
    at least one further screen lining (4b) each can be clamped between a third cross member (18) and a fourth cross member (19), and the third (S3) and fourth (S4) oscillating bodies can be set in oscillation relative to one another in order to alternately compress and expand the further screen linings (4b), wherein
    the third oscillating body (S3) comprises a third pair of push rods (20a, b) on which the third cross members (18) are arranged and
    the fourth oscillating body (S4) comprises a fourth pair of push rods (21a, b) on which the fourth cross members (19) are arranged and
    the first pair of push rods (7a, 7b) and the third pair of push rods (20a, 20b) as well as the second pair of push rods (8a, 8b) and the fourth pair of push rods (21a, 21b) are connected to each other elastically and/or resiliently.
11. Screening device according to claim 10, characterized in that in each case one push rod (7a, 7b) of the first pair of push rods and one push rod (8a, 8b) of the second pair of push rods (8a, 8b) are arranged in alignment with one another.
12. Screening device according to claim 10 or 11, characterized in that in each case one push rod (8a, 8b) of the second push rod pair and one push rod (21a, 21b) of the fourth push rod pair are arranged in alignment with one another.
13. Screening device according to one of claims 10 to 12, characterized in that the third push rod pair (20a, 20b) is coupled to the fourth push rod pair (21a, 21b) via shear-elastic elements (10b).
14. Screening device according to one of claims 10 to 13, characterized in that the third (20a, 20b) and/or the fourth (21a, 21b) pair of push rods are coupled to the support structure (1) via shear-elastic elements (10a).
15. Screening device according to one of claims 10 to 14, characterized in that the elastic and/or resilient connection between the first pair of push rods (7a, 7ab) and the third pair of push rods (20a, 20b) and/or the second pair of push rods (8a, 8b) and the fourth pair of push rods (21a, 21b) is effected in each case by means of a tension-compression spring (23a, b).
16. Screening device according to one of claims 11 to 14, characterized in that the elastic and/or resilient connection between the first pair of push rods (7a, 7b) and the third pair of push rods (20a, 20b) and/or between the second pair of push rods (8a, 8b) and the fourth pair of push rods (21a, 21b) is effected in each case by means of a shear-elastic connecting element (22a, 22b).
17. Screening device according to one of preceding claims, characterized in that a plurality of supporting structures (1) are arranged so as to be supported on one another.

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