SCREENING DEVICE

Abstract

A screening device having a first oscillating body with first cross members and a second oscillating body with second cross members. The first and second cross members are arranged alternately to a screening surface and each includes clamping devices via which screen linings forming the screening surface are each clamped between a first cross member and a second cross member. The first and second oscillating bodies are set in oscillation relative to one another to alternately compress and expand the screen linings. The first oscillating body includes a first pair of push rods on which the first cross members are arranged and the second oscillating body includes a second pair of push rods on which the second cross members are arranged. A stationary support structure accommodates the two oscillating bodies. The first and second oscillating bodies are set in oscillation relative to the stationary support structure.

Claims

1. A screening device having a first oscillating body comprising first cross members and a second oscillating body comprising second cross members, wherein first cross members and second cross members are arranged alternately and preferably transversely to a screening surface and each comprise clamping devices via which screen linings which form the screening surface are each clamped, or can be clamped, between a first cross member and a second cross member, and the first and second oscillating bodies can be set in oscillation relative to one another in order to alternately compress and expand the screen linings, wherein the first oscillating body comprises a first pair of push rods on which the first cross members are arranged and the second oscillating body comprises a second pair of push rods on which the second cross members are arranged and a stationary support structure which accommodates the two oscillating bodies is provided, wherein the first and second oscillating bodies can be set in oscillation relative to the stationary support structure, wherein the first pair of push rods and the second pair of push rods are each coupled to the support structure via transversely elastic elements and are coupled to one another via transversely elastic elements, which transversely elastic elements each enable an oscillation in a coupling axis, wherein the coupling axes of each transversely elastic element run essentially parallel to the push rods.

2. (canceled)

3. The screening device according to claim 1, wherein the first oscillating body and the second oscillating body are embodied with an equal mass.

4. The screening device according to claim 1, wherein an eccentric drive is provided which drives both the first pair of push rods and also the second pair of push rods.

5. The screening device according to claim 4, wherein the eccentric drive is arranged on the first or second pair of push rods.

6. The screening device according to claim 5, wherein the oscillating body which does not bear the eccentric drive comprises an equalizing weight in order to compensate the surplus weight of the oscillating body which bears the eccentric drive.

7. The screening device according to claim 5, wherein the oscillating body which does not bear the eccentric drive is connected to the eccentric drive via a connecting rod that is connected to a transversely elastic element.

8. The screening device according to claim 1, wherein, on the stationary support structure, material-feeding and/or material-removing system components, or attachment elements attaching said system components, or dust-sealing system components are attached or arranged.

9. The screening device according to claim 1, wherein the first and second oscillation systems comprise groups of cross members arranged one below the other and, in order to form multiple screening surfaces arranged above one another, screen linings are clamped on and between the cross members from groups of the first oscillating system and cross members paired therewith from groups adjacent thereto of the second oscillating system.

10. The screening device according to claim 9, wherein the cross members of each group are attached to mounting plates which are arranged such that they run essentially parallel to the support structure walls.

11. The screening device according to claim 1, wherein a third oscillating body comprising third cross members and a fourth oscillating body comprising fourth cross members are provided, wherein at least one other screen lining each can be clamped between one third cross member and one fourth cross member each, and the third and fourth oscillating bodies can be set in oscillation relative to one another in order to alternately compress and expand the other screen linings, wherein the third oscillating body comprises 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 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 springably connected to one another.

12. The screening device according to claim 11, wherein one push rod of the first pair of push rods and one push rod of the second pair of push rods are each arranged in flush alignment with one another.

13. The screening device according to claim 11, wherein one push rod of the second pair of push rods and one push rod of the fourth pair of push rods are each arranged in flush alignment with one another.

14. The screening device according to claim 11, wherein the third pair of push rods is coupled together with the fourth pair of push rods via transversely elastic elements.

15. The screening device according to claim 11, wherein the third pair of push rods and/or the fourth pair of push rods are coupled to the support structure via transversely elastic elements.

16. The screening device according to claim 11, wherein the elastic and/or springable 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 respectively occurs by means of a tension-compression spring.

17. The screening device according to claim 12, wherein the elastic and/or springable connection between the first pair of push rods and the third pair of push rods, and/or between the second pair of push rods and the fourth pair of push rods respectively occurs by means of a transversely elastic connecting element.

18. The screening device according to claim 1, wherein multiple support structures are arranged positioned one on top of the other.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The invention will now be explained in greater detail, in a non-restrictive way, with the aid of exemplary embodiments as shown in the drawings.

[0035] The following are thereby shown:

[0036] FIG. 1 A schematic side view of a screening device according to the invention

[0037] FIG. 2 A schematic side view of a screening device according to the invention

[0038] FIG. 3 A schematic top view of a screening device according to the invention

[0039] FIG. 4 A detailed view of the vibratory drive

[0040] FIG. 5 A schematic illustration for the purpose of demonstrating the oscillating behavior

[0041] FIG. 6 A schematic view of screening devices positioned on top of one another

[0042] FIG. 7 A first alternative embodiment of a screening device according to the invention in a schematic side view

[0043] FIG. 8 A schematic sectional view of the first alternative embodiment

[0044] FIG. 9 A second alternative embodiment of a screening device according to the invention in a schematic side view

[0045] FIG. 10 A third alternative embodiment of a screening device according to the invention in a schematic side view

[0046] FIG. 11 A fourth alternative embodiment of a screening device according to the invention in a schematic side view

[0047] FIG. 1 through 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. First cross members 2 are part of the first oscillating body S1. Second cross members 3 are part of the second oscillating body.

[0048] The screening surface 4 runs at an incline to the horizontal plane, wherein the feed region for the material being screened is located on the left-hand side in FIG. 1, but is not marked separately.

[0049] The screening 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 linings 4a of the screening surface 4 can be attached differently for this purpose; that is, they do not necessarily need to be clamped between one of the first and second cross members 2, 3. The material being screened can, for example, be fed onto the first screen lining 4a, the leftmost screen lining in FIG. 1.

[0050] 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, wherein only the push rods 7a, 8a are visible in FIG. 1. 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. For a person skilled in the art, it is therefore clear that the first oscillating body S1 also comprises the pair of push rods 7a, 7b in addition to the first cross members 2, and that the second oscillating body S2 also comprises the pair of push rods 8a, 8b in addition to the second cross members 3.

[0051] The push rods 7a, 7b, 8a, 8b can, for example, be I-beams, H-beams or U-beams, preferably made of steel.

[0052] A support structure 1 is used to accommodate the two oscillating bodies S1 and S2. Said oscillating bodies are positioned moveably on the support structure 1 so that they can oscillate relative to the support structure 1. The support structure 1 can be embodied as a load-bearing frame, and can thus be individually adaptable to any desired installation locations. As a result, not only is the classic form of installing the support structure 1 on a horizontal installation surface possible, for example in the form of a machine foundation 5 or the floor of a machine hall, but also on a base running at a slope to the horizontal plane. Furthermore, it is also possible to anchor the support structure 1 alongside the oscillating bodies S1, S2, for example in masonry, so that the oscillating bodies S1, S2 are held in a virtually floating manner above the ground and/or above a collecting container.

[0053] In FIG. 1 through FIG. 3, the classic installation version is shown, namely on a machine foundation 5 or the floor of a machine hall. The support structure 1 itself is embodied as a screen box having support structure walls 1a, braces 24, and feet 1b, which illustrate a possibility of the inclined configuration of the screening surface 4. Alternatively, the support structure walls 1a can also be secured on a sloped foundation so that no feet are necessary.

[0054] It should be noted that, in place of the support structure walls 1a, frames or frame profiles can also be provided. A planar embodiment of the support structure walls 1a is not absolutely necessary.

[0055] In the exemplary embodiment according to FIG. 1, the support structure 1 is positioned stationarily on the machine foundation 5 without itself oscillating. The stationary support structure 1 offers the advantage that no energy needs to be spent in order to place said support structure in oscillation. The necessary drive energy for operating the screening device according to the invention can be reduced by approximately ¾ compared to conventional flip-flow screening devices with springable mounting on a base. The machine weight is lighter and the transmission of dynamic forces to the machine foundation is reduced or, in the case of a corresponding mass balance, is eliminated entirely, as will be explained in greater detail below.

[0056] The mounting or coupling of the pairs of push rods 7a, 7b, 8a, 8b on or to the support structure 1, respectively, occurs via transversely elastic elements 10a, in practice also often referred to as rubber blocks for short. Said elements enable an oscillation in the direction of a coupling axis 11, whereas no oscillations occur in directions different therefrom, though said oscillations are merely so small that they can be ignored when considering the overall oscillating behavior of the oscillating bodies S1, S2. The coupling axis 11 preferably runs essentially parallel to the longitudinal axis of the push rods 7a, 7b, 8a, 8b. In principle, however, it is also conceivable to enable, through a corresponding fabrication of the transversely elastic elements 10a, coupling axes which do not run parallel to the push rods 7a, 7b, 8a, 8b.

[0057] The push rods 7a, 7b, 8a, 8b are thereby supported on consoles 9 of the support structure 1 on the one hand, but also among one another via transversely elastic elements 10b.

[0058] To put it another way, the pairs of push rods 7a, 7b, 8a, 8b are, as can easily be seen in FIG. 1, clamped between the consoles 9 such that said pairs of push rods oscillate, wherein transversely elastic elements 10a are provided between the consoles 9 and push rods 7a, 7b, 8a, 8b, and transversely elastic elements 10b are likewise provided between the top pair of push rods 7a, 7b and the bottom pair of push rods 8a, 8b.

[0059] The oscillation is excited via a drive unit 6 having a drive 6c that is embodied as an eccentric drive. In the exemplary 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 springably coupled to the drive 6c through the use of a transversely elastic element 10c. The motor 6a of the drive unit 6 is arranged on the stationary support structure 1 and coupled to the eccentric drive 6c via a V-belt or universal joint drive shaft.

[0060] Illustrated by a dashed line are material-feeding or material-removing system components 14a, b, c or means 15a, b, c for attaching said system components. Said means 15a, b, c can, for example, be flanges mounted on the support structure 1, via which flanges the system components 14a, b, c can be connected in a fixed manner to the support structure 1 at predefined locations so that the support structure 1 and the system components form a collective screening system.

[0061] The system components 14a, b, c can be used for the feed or removal of materials or screened product, for example. The system component 14a in FIG. 1, for example, is a feed chute via which material that is to be screened can be guided onto the screening surface 4. The system component 14b is a discharge shaft via which unscreened material is further conveyed after the screening device. System component 14c is used to install a support structure 1 comprising support structure walls 1a at a corresponding inclination and, at the same time, to remove the screened material.

[0062] FIG. 4 shows a detailed view of the drive unit 6 from FIG. 1 comprising a motor 6a which can preferably be speed-controlled via a frequency converter and which drives the eccentric shaft 6c via a belt 6b. The oscillating body S1 is connected via the pair of push rods 7a, 7b and connecting rod 6d thereof. In the present exemplary embodiment, laminated wooden leaf springs function as connecting rods 6d, which leaf springs are sufficiently flexible and via which the push rods 7a, 7b are moved back and forth in the direction of the arrows 13. In principle, however, the use of connecting rods made of other materials that exhibit the necessary flexibility is also conceivable. Purely by way of example, the possibility of embodying the connecting rods 6d as thin-walled steel springs should be noted at this juncture. The material glass-fiber reinforced plastic is also suitable for the production of glass-fiber reinforced plastic leaf springs with properties similar to the wooden leaf springs, and can therefore be used as connecting rods 6d in the present exemplary embodiment.

[0063] The connecting rod 6d is connected to the pair of push rods 7a, 7b of the oscillating body S1 by a screw connection of rubber block elements 10c, which are secured in the profile of the pairs of push rods 7a, 7b, to the connecting rods 6d, either directly or via an intermediate plate (not illustrated).

[0064] The pair of push rods 8a, 8b is connected directly to the eccentric drive 6c, for example by a screw connection of the individual components.

[0065] Through the use of the transversely elastic elements 10a, 10b, 10c, a solely linear oscillation of the oscillating bodies S1, S2 is ensured. This enables the use of screen mats 4a which are raised at the sides, as can be seen in FIG. 2 in particular.

[0066] FIGS. 5a through 5c schematically show the movements of the pairs of push rods 7a, 7b, 8a, 8b, and thus the oscillating behavior of the oscillating bodies S1, S2, during the use of a drive 6 as shown in FIGS. 1 through 4. The screening device is thereby operated in the resonance range with a settable operating frequency.

[0067] FIG. 5a shows the two oscillating bodies S1, S2 in a resting position. In this case, the screen linings 4a clamped between the first and second cross members 2, 3 sag slightly. As a result of the eccentric drive 6c arranged on the oscillating body S2, the pair of push rods 7a, 7b, and therefore the oscillating body S1, are set in oscillation via the connecting rod 6d on the one hand. At the same time, an oscillation of the elastically mounted oscillating body S2 also occurs.

[0068] FIG. 5b shows the push rods 8a, 8b in the—in relation to the resting position in FIG. 5a—state thereof in which they are maximally deflected by the oscillation amplitude “a” due to the eccentricity “e” of the eccentric drive 6c. In the ideal case of matched 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 left screen lining 4a in FIG. 5b, the screen linings are alternately compressed and expanded as a result of the movements of the pairs of push rods 7a, 7b, 8a, 8b, which movements are also accompanied by corresponding movements of the first and second cross members 2, 3, and can therefore easily eject particles clogging the screen openings in the case of screening materials that are difficult to screen.

[0069] The matching of the masses of the two oscillating bodies S1, S2 with one another has a great influence on the functioning of the screening device. Only if there is equality of mass between the two oscillating bodies S1, S2 do the forces cancel one another out in the opposing phase-shifted oscillations of the two oscillating bodies S1, S2 and cause no dynamic loads to be transmitted to the support structure 1, whereby said structure can correspondingly have less massive dimensions. For a perfect mass balance, the surplus weight occurring due to the eccentric drive 6 of the oscillating body S2 is compensated on oscillating body S1 by an equalizing weight (not illustrated). In this context, explicit reference is made to the previous explanations for the sake of understanding the term “equality of mass.”

[0070] As a result of the compression and expansion of the screen linings 4a and the inclination of the screening surface 4, the material being screened is conveyed from left to right during screening in the illustrated embodiments. In the operating state, the screening surface 4 is inclined at the angle α to the horizontal plane. The angle α is approximately between 5° and 25°, preferably between 10° and 25°, particularly preferably between 15° and 20°, wherein in this case the straight connection between the clamping locations of the screen linings 4a on the first and second cross members 2, 3 is considered to be the screening surface 4, since the actual screening surface 4 formed by the screen linings 4a does not constitute a continuously straight surface.

[0071] FIG. 6 shows an embodiment in which two screening devices according to the invention are arranged one on top of the other in that the stationary support structure of the one screening device is mounted on the stationary support structure of the other screening device. Not shown are means for connecting and locking the two support structures to one another. Due to the fact that no dynamic loads are transferred to the machine foundation if the oscillating bodies are sized accordingly, more than two support structures of this type, together with oscillating bodies, can also be arranged one on top of the other without critical forces necessitating a height limitation on the stationary support structures in this case.

[0072] FIG. 7 shows an embodiment of a screening device according to the invention in which two screening surfaces 4 running one below the other are provided, without the constructive effort for the screening device being significantly increased since only two pairs of push rods 7a, 7b, 8a, 8b are still used.

[0073] At this juncture, it must be emphasized that, in the exemplary embodiment shown, only two screening surfaces 4 are embodied, but that the embodiment of more than two screening surfaces one below the other is in principle also possible.

[0074] The simple constructive design is distinguished 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. Specifically, mounting plates 16a, 16b are arranged on both sides of the screening surface 4 or screen linings 4a on oscillating system S1. On the mounting plates 16a, 16b, one group G1 of cross members, specifically one first cross member 2 and another first cross member 2a, are mounted one below the other.

[0075] The same applies to the oscillating system S2. On said oscillating system, a mounting plate 17a, 17b is likewise arranged on both sides of the screening surface 4 or screen linings 4a. On the mounting plates 17a, 17b, one group G2 of cross members, specifically one second cross member 3 and another second cross member 3a, are mounted one below the other.

[0076] FIG. 8 shows a schematic sectional view through a mounting plate 16a on the left-hand side and a schematic sectional view through a mounting plate 17b on the right-hand side.

[0077] The groups G1 and G2 are arranged along the screening surface 4 in an alternating distribution, so that a screen lining 4a is clamped on both a first cross member 2 of a group G1 of the oscillating system S1 and also on a second cross member 3 of a group G2 adjacent thereto of the oscillating system S2.

[0078] In contrast to the embodiment of a screening device according to the invention illustrated in FIGS. 1 through 3, an additional screen lining 4c is clamped below the screen lining 4a in the embodiment illustrated in FIGS. 7 and 8. The screen lining 4c is thereby clamped on another first cross member 2a of the group G1 and another second cross member 3a of the group G2.

[0079] In this manner, multiple screening surfaces 4 can be embodied one below the other.

[0080] In the exemplary embodiment shown, the mounting plates 16a, 16b and 17a, 17b run parallel to the support structure walls 1b. The cross members of a group G1 and G2 are secured to the inner side of the mounting plates 16a, 16b and 17a, 17b, respectively, that is, on the sides facing the screening surfaces 4. Securing pins 25 are located on the outer sides of the mounting plates 16a, 16b and 17a, 17b, which pins are connected to the push rods of the same oscillating system S1, S2 to which the respective mounting plate belongs. In order to connect the mounting plates 16a, 16b and 17a, 17b to the appropriate push rods via the securing pins 25, openings are provided in the support structure walls 1a.

[0081] 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 embodied in a manner identical as the two oscillating systems S1 and S2 and are coupled to the support structure 1 in an identical manner and also coupled among one other in an identical manner. In addition, the oscillating system S3 is also coupled to the oscillating system S1 and the oscillating system S4 is coupled to the oscillating system S2, namely via springable and/or elastic elements, preferably or specifically via tension-compression springs (23a, 23b).

[0082] FIG. 10 shows an embodiment of the screening device according to FIG. 9, but with transversely elastic connecting elements 22a, 22b (similar to 10c) in place of the tension-compression spring (23a, 23b) so that, in accordance with the embodiment illustrated in FIG. 1, a purely linear oscillation of the oscillating systems S1 and S2 occurs.

[0083] Through the arrangement of the additional oscillating systems S3, S4, it is possible to embody screening surfaces 4, 26 with different material conveying capacities altogether, whereby the fact is accounted for that a greater material conveying capacity is necessary in the feed region due to the layer height of the material to be screened which prevails there, than in the removal region.

[0084] As illustrated in FIG. 4, the screening surface 4 is formed by the screen linings 4a of the first and second oscillating systems S1, S2, and another screening surface 26 is formed by the other screen linings 4b of the third and fourth oscillating systems S3, S4.

[0085] The two screening surfaces 4 and 26 are connected via a screen lining 4d.

[0086] Through a corresponding design of the elastic or springable connection 22a, 22b, 23 a, 23b of the first S1 oscillating system to the third S3 oscillating system and the second S2 oscillating system to the fourth S4 oscillating system, or with a corresponding choice of the mass of the third S3 and fourth S4 oscillating systems, the amplitudes of the pairs of push rods 20a, 20b and 21a, 21b of the third S3 and fourth S4 oscillating systems, respectively, can be set to be different from the amplitudes of the first oscillating system S1 and the second oscillating system S2. The amplitude of the removal-side pairs of push rods 20a, 20b, 21a, 21b is preferably set to be smaller than that of the feed-side pairs of push rods 7a, 7b, 8a, 8b. At this juncture, it should not go unmentioned that, in principle, additional oscillating systems can also be provided in the stationary support structure, which additional oscillating systems are connected to the third and fourth oscillating systems S3, S4 in the same way the third and fourth oscillating systems S3, S4 are connected to the first and second oscillating systems S1, S2.

[0087] FIG. 11 shows an embodiment in which the screening devices forming the individual screening decks basically correspond to the screening device illustrated in FIGS. 1 through 3, with the difference that the inclination of the screening surface 4 decreases as the screen length increases, as can be seen from the indicated angles α1 and α2, since α1>α2. Accordingly, the pairs of push rods 7a, 7b, 8a, 8b also have a curved shape. Of course, a single screening device according to the invention, as illustrated in FIGS. 1 through 3, can also comprise a screening surface 4, the inclination of which decreases as the screen length increases.

[0088] It is self-evident that the embodiment with multiple stationary support structures arranged one on top of the other, as illustrated in FIG. 6 and FIG. 11, is also feasible for the embodiments of the screening devices illustrated in FIGS. 7 through 9.

[0089] In addition, it is clear to a person skilled in the art that, through the use of the transversely elastic elements 10a, 10b, 10c, the embodiments shown in FIGS. 6, 7, 8 and 10 also benefit from a solely linear oscillation of the oscillating bodies S1, S2 and S3, S4, and that the use of screen mats 4a and 4b with raised sides is thus possible.

LIST OF REFERENCE NUMERALS

[0090] 1 Support structure [0091] 1a Support structure walls [0092] 1b Feet [0093] 2 First cross members [0094] 2a Other first cross members [0095] 3 Second cross members [0096] 3a Other second cross members [0097] 4 Screening surface [0098] 4a Screen lining [0099] 4b Other screen lining [0100] 4c Additional screen lining [0101] 4d Connecting screen lining [0102] 5 Machine foundation or platform of a machine hall [0103] 6 Drive unit [0104] 7a, b First pair of push rods [0105] 8a, b Second pair of push rods [0106] 9 Console [0107] 10a Transversely elastic element [0108] 10b Transversely elastic element [0109] 10c Transversely elastic element [0110] 11 Coupling axis [0111] 12 Feed direction [0112] 13 Movement direction of the push rods [0113] 14a Material-feeding system component [0114] 14b Material-removing system component [0115] 14c Material-removing system component [0116] 15a Means for attaching system components [0117] 15b Means for attaching system components [0118] 15c Means for attaching system components [0119] 16a, b Mounting plates for first cross members [0120] 17a, b Mounting plates for second cross members [0121] 18 Third cross members [0122] 19 Fourth cross members [0123] 20a, b Third pair of push rods [0124] 21a, b Fourth pair of push rods [0125] 22a, b Transversely elastic connecting element [0126] 23a, b Tension-compression spring [0127] 24 Braces [0128] 25 Securing pin [0129] 26 Other screening surface [0130] S1 First oscillating body [0131] S2 Second oscillating body [0132] S3 Third oscillating body [0133] S4 Fourth oscillating body [0134] G1 Groups of cross members arranged one below the other on the first oscillating system [0135] G2 Groups of cross members arranged one below the other on the second oscillating system