Sieving device

Abstract

The invention relates to a sieve device with a sieve box (10) in or on which at least one sieve lining (14, 15) is arranged, wherein the sieve lining (14, 15) can be set into oscillating motions by means of a vibration drive (20), wherein the vibration drive (20) has two excitation units (21), wherein the excitation units (21) are mechanically coupled to each other by means of a synchronization device (26), wherein the synchronization device (26) has two transmission elements (64, 68) which are detachably coupled to each other in the area of ​​a coupling point by means of a coupling device (60) and are rotationally fixed to each other. The assembly of such a sieve device can be simplified if an alignment aid with at least one alignment element (62.1, 68.2, 69) is provided, which is arranged and designed to align the transmission elements (64, 68) against each other in the area of ​​the coupling point during the joining process of the two transmission elements (64, 68).

Description

[0001] The invention relates to a sieve device with a sieve box in or on which at least one sieve lining is arranged, wherein the sieve lining can be set into oscillating movements by means of a vibration drive, wherein the vibration drive has two excitation units, wherein the excitation units are mechanically coupled to each other by means of a synchronization device, wherein the synchronization device has two transmission elements which are detachably coupled to each other in the area of ​​a coupling point by means of a coupling device and are rotationally fixed to each other.

[0002] Such sieve arrangements can be used in particular as pre-sieving or post-sieving devices, preferably in material processing equipment for processing, especially for comminution, mineral materials. Accordingly, they can be arranged upstream or downstream of the comminution device in the direction of the material flow of the material processing equipment.

[0003] Prior art describes screening devices that have two excitation units in the form of unbalance drives ("flange vibration motors") flanged laterally to the screen box. To synchronize the unbalance of the left and right sides, these are connected to each other in a rotationally fixed manner via a shaft running under a screen deck and divided by a plug connection. The shaft is enclosed in a protective sleeve to prevent contamination and accidental contact. For assembly, one unbalance drive must first be installed on one side. Then, the unbalance drive is attached to the opposite side. The two halves of the shaft must be positioned opposite each other and connected. A maintenance opening is provided for this purpose, allowing the operator to reach through and join the two halves of the shaft.Access to the maintenance opening is often severely restricted due to the building's structure. Furthermore, it has been found that the maintenance opening requires extensive sealing against dust ingress. It must also withstand the vibrations that occur. Installation generally requires at least two people.

[0004] From RU 2 243 829 C2, a sieve device with a sieve box and a sieve lining is known. The sieve lining can be set into vibration by means of a vibratory drive. The vibratory drive has two vibratory units which are connected to each other by a shaft. The shaft has a coupling at each end for connection to a respective vibratory unit. For this purpose, tapered pins, which are connected to the vibratory units, are inserted into corresponding receptacles of the couplings.

[0005] The object of the invention is to provide a sieve device of the type mentioned above, which enables easy assembly and maintenance of the vibration drive.

[0006] This problem is solved by providing an alignment aid with at least one alignment element, which is arranged and designed to align the two transmission elements relative to each other in the area of ​​the coupling point during the joining process. Thus, the transmission element(s) can be aligned in an assembly position during the joining movement using the at least one alignment element, enabling the transmission elements to be joined, preferably without external access to the coupling point. This significantly simplifies assembly. Furthermore, it reduces the number of parts required, as the assembly opening can be omitted or at least designed much more simply.

[0007] According to one possible embodiment of the invention, it may be provided that the transmission elements are each coupled to a joint, in particular a universal joint, facing away from the coupling point, and that an alignment element is designed in the form of an elastic component which stiffens one of the joints in such a way that the transmission element connected to the joint is held in a joining position raised relative to the direction of gravity, or that two alignment elements are each designed in the form of an elastic component which each stiffen one of the joints in such a way that the transmission element connected to the joint is held in a joining position raised relative to the direction of gravity.It may be that the transmission elements are then positioned in the raised mounting position in such a way that they can be joined together without further ado, or at least one further alignment element is provided that then positions the transmission elements exactly and correctly in relation to each other.

[0008] A particularly cost-effective variant of the alignment aid described above arises when the universal joints, together with the transmission elements, form a driveshaft, and the alignment element surrounds at least one of the universal joints, at least partially, with heat-shrink tubing. The heat-shrink tubing stiffens the universal joint but does not impair its functionality, as it is sufficiently elastic. If the heat-shrink tubing is damaged or otherwise loses its function during normal operation of the sieve device, this is not critical, as it is only required for assembly.

[0009] A particularly preferred embodiment of the invention is such that the transmission elements each comprise a pipe section, and that in the area of ​​the coupling point, the two pipe sections are inserted into one another at their pipe ends and connected to each other in a rotationally fixed manner in the joining area. In the simplest case, the pipe sections are non-circular, at least in the area of ​​their pipe ends in the joining area. Thus, the inserted pipe ends are already rotationally fixed to one another due to their cross-sectional geometry. Additional connecting means are then no longer strictly necessary. This further simplifies the parts and assembly effort.

[0010] According to one embodiment of the invention, the alignment element of the alignment aid can be held by means of a fastening section in the region of a free end of the first transmission element, and the alignment element has a centering receptacle that is aligned with the second transmission element. This allows the second transmission element to align itself with the alignment element during the joining process. As a result, the two transmission elements can then be joined precisely.

[0011] The alignment element can, for example, be designed such that the centering receptacle has a funnel-shaped extension, particularly an internal cone, that widens at least partially around its circumference towards the second transmission element. It is also conceivable that the alignment element has a centering pin or projection whose outer circumference, for example, forms the centering receptacle.

[0012] According to one embodiment of the invention, the alignment element can be designed as a molded body and slid onto the free end of the first transmission element at its outer circumference. The molded body preferably has a stop that secures it immovably to the first transmission element in the assembly direction. This provides a simple and secure fixing of the alignment element for assembly. The molded body is preferably made of a plastic component, more preferably of a foam molded body.

[0013] It is possible that the molded part has a structure such that it is only sufficiently dimensionally stable for assembly. It is conceivable that it will then be destroyed during operation, since it is only needed for mounting the two transmission elements. It may therefore be manufactured as a particularly cost-effective component.

[0014] A sieve device according to the invention can also be configured such that the alignment aid, as an alignment element, has a support body attached to one of the transmission elements, which is supported on a component of the sieve device that is stationary relative to the transmission elements, and wherein a sliding fit is provided between the alignment element and the stationary component, along which the alignment element is slidably guided in the direction of the joining direction. This enables unambiguous alignment of the transmission element. It is conceivable that the stationary component is formed by a casing tube within which the synchronization device is arranged, at least partially.

[0015] In particular, it may be provided that the alignment element is guided radially outside on the inner circumferential surface of the casing tube in a displaceable manner, forming a sliding fit in the direction of the longitudinal extent of the casing tube, and that preferably the alignment element is connected to one of the transmission elements in a radially non-adjustable manner.

[0016] To prevent incorrect assembly, a limiting element may be provided that limits the adjustment movement of the alignment element relative to the transmission element.

[0017] The invention can preferably be used in a sieve device such that the excitation units each have a motor unit with an electric motor, each of which drives a drive shaft, each of which drives at least one unbalanced weight, and the drive shafts are mechanically coupled to each other by means of the synchronization device, wherein each drive shaft is coupled to one of the transmission elements.

[0018] The invention will be explained in more detail below with reference to an embodiment illustrated in the drawings. The drawings show: Fig. 1. Side view, a schematic representation of a sieve device in vertical section, Fig. 2: a vibration drive of the sieving device according to Fig. 1, along the in Fig. 1 section marked with II-II, Fig. 3 a detail of the vibration drive along the in Fig. 1 with section line marked III-III, Fig. 4 a detailed view along the in Fig. 2 with section line marked IV-IV. Fig. 5 a fastening element in perspective view, Fig. 6 a synchronization device in side view and Fig. 7 the synchronization device along the in Fig. 6 with section line marked VII-VII.

[0019] Fig. Figure 1 shows a screening device typically used in a material processing plant, particularly a rock crusher. The screening device has a screen box 10. This screen box 10 has two spaced-apart screen side walls 21, between which a screening area is formed.

[0020] The sieve box 20 is closed at the bottom by a base 12. At least one sieve layer 14, 15 is arranged within the sieve box 10 at a distance from the base 12. In the present embodiment, two sieve bases 14, 15 are installed.

[0021] A conveying area 13 is formed in the area above the upper screen layer 14. During operation, the screen box 10 is set into vibration by means of a vibratory drive 20. As a result of these vibrations, material placed on the upper screen layer 14 is conveyed along the conveying area 13. Fig. 1. From left to right, the material is conveyed. A first sub-fraction is screened on the screen 14 and transported away via the screen 14. The screened material falls onto the lower screen 15 and undergoes a further screening process. The screened material is again transported away on the lower screen 15, and the fine fractions that have fallen through the screen 15 are discharged via the bottom 12.

[0022] The vibration drive 20 is in Fig. Figure 2 illustrates this in more detail. As this illustration shows, the vibratory drive 20 has a modular design and comprises two excitation units 21. Each excitation unit 21 is mounted in the area of ​​a screen side wall 11. The two excitation units 21 are coupled to each other via a synchronization device 26.

[0023] With reference to Fig. 3. The construction of the excitation units 21 is explained in more detail. As this illustration shows, the excitation unit 21 can be constructed such that it generates an imbalance by means of one or more unbalanced weights 40, which are arranged eccentrically to a drive shaft 31. This imbalance generates the vibrational movements in the sieve box 10.

[0024] The excitation unit 21 can include a motor unit 30, which comprises the drive shaft 31. The drive shaft 31 is driven by the motor rotor of an electric motor 32. The drive shaft 31 is rotatably mounted on opposite sides of the electric motor 32 by means of bearings 33. The electric motor 32 is housed in a motor casing 34. The bearings 33 may be mounted within the motor casing 34 itself. However, it is also conceivable, as this Fig. Figure 3 shows that separate bearing holders 35, 36 are attached to the motor housing 34, each holding one of the bearings 33. This allows for a modular design in which the prefabricated bearing holders 35, 36 can be installed like a kit with different motor housings 34.

[0025] A mounting flange 34.1 can be provided for attaching the motor unit 30 to the sieve box 10, which can in particular be integrally connected to the motor housing 34.

[0026] The motor unit 30 can preferably be mounted in an opening 11.1 in the screen side wall 11. The motor housing 34 can be inserted into this opening 11.1. For mounting the motor unit 30, bores are machined into the screen side wall 11. These bores are aligned with bores 34.2 in the mounting flange 34.1. The motor unit 30 is mounted to the screen side wall 11 by means of fastening elements 25, which are inserted through the aligned bores 34.2 in the screen side wall 11 and in the mounting flange 34.1, as will be explained in more detail later.

[0027] As the representation according Fig. As further illustrated in Figure 3, the drive shaft 31 may have a receptacle 37, 38 at each of its two ends. An unbalanced weight 40 is fixed to each of these receptacles 37, 38 in a rotationally fixed manner. The unbalanced weight 40 has a single weight 41. This single weight 41 has a bore. The single weight 41 is pushed onto the receptacle 37, 38 of the drive shaft 31 by means of this bore.

[0028] How Fig. As shown in Figure 2, depending on the system configuration, an additional unbalanced mass may be required. For this purpose, it may be provided that, in addition to the individual weight 41, one or more additional weights 42 are connected to the drive shaft 31, either directly or indirectly, in a rotationally fixed manner.

[0029] It can be like this: Fig. Figure 2 shows that the additional weight 42 is directly connected to the individual weight 41. For this purpose, the individual weight 41 may be provided with a bolt 43 onto which the additional weight 42 is slid via a bore. Thus, the additional weight 42 can be connected to the individual weight 41 by screwing a nut 44 onto the bolt 43, which securely clamps the additional weight 42 to the individual weight 41.

[0030] Preferably, the masses at both ends of the drive shaft 31 are chosen to be equal or at least approximately equal in order to achieve a uniform load on the drive shaft 31.

[0031] Evidentiously Fig. 3. The motor unit 30 may be equipped with a support device, preferably a lifting eye 39. The lifting eye 39 may be screwed into the outer end of the drive shaft 31 in the area of ​​the receptacle 37. By means of the support device, the motor unit 31 can be suspended from an auxiliary device and handled more easily for assembly purposes, thus simplifying the assembly process.

[0032] How Fig. As shown in Figure 2, the two excitation units 21 on either side of the sieve box 10 can be of a fundamentally similar design, so that reference can be made to the preceding explanations. Preferably, the excitation units 21 are identical or substantially identical in construction, thus reducing the parts and assembly effort.

[0033] On the outer side of the associated sieve side wall 11, the excitation units 21 are covered by a cover 50, which is preferably connected to the associated bearing holder 36. The cover 50 covers the rotating parts of the motor unit 30 on the outside, thus eliminating the risk of injury.

[0034] Fig. 1 and Fig. Figure 3 further illustrates that the part of the motor unit 30 projecting outwards beyond the side wall 11 of the sieve can be completely or at least mostly covered from above in the direction of gravity by a protective cover 70. This protective cover 70 protects the motor unit 30 from the mechanical impact of falling parts. The protective cover 70 can be manufactured as a stamped and bent part from a sheet of steel.

[0035] According to the Fig. 2 and Fig. 3 A casing tube 22 extends between the two sieve side walls 11. The casing tube 22 has two tube sections 22.1, 22.2 which are nested inside one another. The tube sections 22.1, 22.2 of the casing tube 22 each have a flange 23, 24 at their end facing the sieve side wall 11. The flanges 23, 24 are equipped with bore-shaped fittings 23.1 (see Fig. 3).

[0036] To secure the sheathing tube 22 between the screen side walls 11, the two tube sections 22.1, 22.2 are pushed together until the tube ends abut the flanges 23, 24. The length of the sheathing tube 22 is then less than the clear distance between the screen side walls 11. The sheathing tube 22 can thus be easily inserted into the space between the screen side walls 11.

[0037] The fastening elements 25 mentioned above are used to attach the casing tube 22 to the sieve side walls 11. The fastening elements 25 are designed as dowel pins and are in Fig. 5 shown more clearly.

[0038] How Fig. As shown in Figure 5, the fastening elements 25 have a head 25.1. A bolt 25.2 is integrally attached to this head 25.1. In the transition area between the head 25.1 and the bolt 25.2, a locking section 25.3 is formed on the bolt 25.2. This locking section 25.3 has a surface structure with raised and recessed areas. Opposite the head 25.1, the fastening element has a threaded section 25.4.

[0039] The fasteners 25 can be inserted, with their bolt 25 leading, through the receptacle 23.1 of the flange 23. In the assembled state, the locking section 25.3 comes to rest in the receptacle 23.1. The receptacle 23.1 is designed as a bore, the bore diameter of which is smaller than the outer diameter of the locking section 25.3. Thus, the locking section 25.3 can be pressed into the receptacle 23.1, with the aforementioned protrusions of the locking section 25.3 embedding themselves into the inner wall of the receptacle 23.1. In this way, the locking section 25.3 forms a positive-locking connection in the circumferential direction of the bolt 25.2 between the flange 23 and the fastener 25.

[0040] Fig. Figure 3 illustrates that the bolt 25.2 of the fastening element 25 is inserted through a bore in the screen side wall 11 and through the bore 34.2 of the mounting flange 34.1 of the motor housing 34. A nut 34.4 is screwed onto the threaded section 25.4 of the fastening element 25. Thus, the motor housing 34 and simultaneously the associated pipe section 22.1, 22.2 can be connected to the screen side wall 11 by means of the fastening element 25.

[0041] Assembly is remarkably simple. As mentioned above, the casing tube 22 simply needs to be placed between the two sieve side walls 11. The two tube sections 22.1 and 22.2 can be telescoped into each other until the clear distance between the sieve side walls 11 is greater than the distance between the free ends of the bolts 25.2 of the fastening elements 25, which are pre-assembled and secured in the two flanges 23 and 24 in the fitting 23.1. Once the bolts 25.2 are aligned with the holes in the sieve side walls 11, the tube sections 22.1 and 22.2 simply need to be moved outwards so that the threaded sections 25.4 are inserted through the sieve side walls 11. This holds the casing tube 22 in a pre-assembly position. For further assembly, no access from the inside of the sieve box 10 is required. The following assembly steps can be carried out from the outside of the sieve box 10.

[0042] In particular, the two motor units 30 can now be mounted to the sieve side walls 11 from the outside, and the nuts 34.4 can be tightened from the outside. Since the fastening element 25 with its locking section 25.3 is captive and rotationally fixed in the flange 23, 24, the fastening element 25 no longer needs to be held from the inside of the sieve box 10 when the nut 34.4 is tightened. When the nut 34.4 is tightened, the two pipe sections 22.1, 22.2 are extended further outwards, so that they can compensate for any positional tolerances of the sieve side walls 11.

[0043] It may be provided that sealing elements 34.3 are arranged between the flanges 23, 24 to prevent dust from entering the area surrounded by the casing tube 22. The sealing element 34.3 can, for example, be designed as a circumferential sealing ring arranged between the flange 23, 24 and the inside of the screen side wall 11.

[0044] The two excitation units 21 are mechanically coupled to each other by means of a synchronization device 26, as shown here. Fig. Figure 2 shows. The synchronization device 26 serves to synchronize the rotary movements of the drive shafts 31 of the motor units 30.

[0045] How Fig. Figure 2 shows that the centers of mass of the unbalance weights 40 of the excitation units 21 are held in the circumferential direction at the same angular position or at least approximately at the same angular position by means of the synchronization device 26.

[0046] The synchronization device 26 can have a coupling device 60, as described in the Fig. 6 and Fig. Figure 7 shows that the coupling device 60 may have coupling pieces 61, 65 at opposite ends, each of which is non-rotatably connected to one of the drive shafts 31 of the motor units 30, as shown. Fig. 2 shows.

[0047] For this purpose, a holder 45 can be rotationally fixed to the drive shaft 31. The associated end of the coupling device 60 is connected to this holder 45 by means of screw connections 46.

[0048] Each coupling piece 61 is connected to a universal joint 62. The universal joint 62 carries a transmission element 64, and the universal joint 66 carries a transmission element 68. The two transmission elements 64 and 68 can be connected to each other, in particular in a rotationally fixed manner.

[0049] It is possible that the two transmission elements 64, 68 are or have pipe sections 64.1, 68.1. It is possible that the pipe sections 64.1, 68.1 have a non-circular cross-section and are pushed into one another in the area of ​​a coupling point, as shown. Fig. Figure 7 shows that the cross-sections of the pipe sections 64.1, 68.1 in the joining area of ​​the coupling point are designed such that they form a positive-locking connection in the circumferential direction when joined.

[0050] Evidentiously Fig. 7. The cardan joints 62, 66 may have fastening pieces 63, 67 which are fitted into the ends of the pipe sections 64.1, 68.1 facing away from the coupling point in order to form a rotationally fixed connection between the cardan joint 62, 66 and the pipe section 64.1, 68.1.

[0051] As the Fig. 6 and Fig. Figure 7 shows that an alignment aid is used which is designed and arranged to align at least one of the transmission elements 64, 68 in its mounting position during the joining movement in which the exciter unit 21 is mounted on the screen side wall 11. This aligned mounting position is such that the two transmission elements 64, 68 are joined together without requiring any operator intervention at the coupling point.

[0052] Preferably, the sheathing tube 22 is closed in the area of ​​the coupling point, which significantly simplifies its construction. Alternatively, it can also be provided that only an inspection opening is incorporated into the sheathing tube 22 in the area of ​​the coupling point in order to monitor the joining process and, if necessary, to correct it.

[0053] The alignment aid has at least one alignment element 62.1, 68.2, 69.

[0054] The individual alignment elements 62.1, 68.2, and 69 are explained in more detail below. How the Fig. 6 and Fig. As shown in Figure 7, the alignment element 62.1 can be designed and arranged to stabilize one of the cardan joints 62, 66 in the assembly position or at least approximately in the assembly position.

[0055] For this purpose, the alignment element 62.1 may be designed in the form of an elastic component that stiffens one of the cardan joints 62, 66 in such a way that the transmission element 64, 68 connected to the joint is held in a joining position raised relative to the direction of gravity.

[0056] As the illustrations show, the alignment element 62.1 may be formed by a plastic heat-shrink tube that surrounds the cardan joint 62, 66. The heat-shrink tube holds the transmission element 64 in its orientation raised relative to the direction of gravity, as shown by Fig. 6 and Fig. 7 results, or at least approximately in this position shown.

[0057] Additionally or alternatively, the alignment aid can also include an alignment element 68.2, as can be seen from Fig. 6 results. This alignment element 68.2 can preferably be formed by a shaped body that is pushed onto the outer circumference of one of the transmission elements 64, 68. As shown Fig. 2. This alignment element 68.2 rests with its outer circumference against the inner contour of the casing 22. It can be supported over its entire circumference or only over a portion of it against the inner wall of the casing 22. In this way, the connected transmission element 68 is aligned in its mounting position, or nearly so, with respect to the stationary casing 22.

[0058] It is possible that the transmission element 68 also carries a limiting element 68.3. This can, as Fig. Figure 7 shows that it is connected in one piece to the transmission element 68. The limiting element 68.3 serves to limit the displacement movement of the alignment element 68.2, which is attached to the transmission element 68.

[0059] Additionally or alternatively, an alignment element 69 may be used, which is attached to one end of a transmission element 64, 68 by a fastening section 69.1. The mounting movement of the alignment element 69 on the transmission element 64, 68 is limited by a stop 69.3 of the alignment element 69.

[0060] For example, this stop 69.3 may abut the free end of the transmission element 68, on which the alignment element 69 is attached. The alignment element 69 has a centering receptacle 69.2, which is aligned and oriented towards the second transmission element 64. This centering receptacle 69.2 may be designed in the form of a funnel-shaped extension, as shown. Fig. 7 shows.

[0061] To mount the exciter units 21, one of the exciter units 21 is first mounted on the associated sieve side wall 11 as described above. The transmission element 64, 68 connected to this exciter unit 21 is then inserted into the casing tube 22. If the alignment aid is such that the alignment element 62.1, which stiffens the cardan joint 62, is used, the transmission element 64 is already aligned in its approximate mounting position.

[0062] If the alignment element 68.2 is used, the connected transmission element 68 centers itself relative to the sheathing tube 22 in its approximate mounting position.

[0063] When the two excitation units 21 are moved towards each other, the free end of the transmission element 64 penetrates into the centering receptacle 69.2 of the alignment element 69 and is aligned so that the two transmission elements 64, 68 can be joined together, as shown. Fig.7 shows.

[0064] If the non-circular cross-sections of the transmission elements 64, 68 do not meet exactly, this can be corrected by a slight rotation of one of the excitation units 21 until a perfect match is achieved and the transmission elements 64, 68 can finally be inserted into each other.

[0065] Finally, the excitation units 21 are clamped to the sieve side wall 11 with the fastening elements 25 as explained above, and the assembly is complete.

Claims

[1] Sieve device with a sieve box (10) in or on which at least one sieve lining (14, 15) is arranged, wherein the sieve lining (14, 15) can be set into oscillating motion by means of a vibration drive (20), wherein the vibration drive (20) has two excitation units (21), wherein the excitation units (21) are mechanically coupled to one another by means of a synchronization device (26), wherein the synchronization device (26) has two transmission elements (64, 68) which are detachably and rotationally fixedly coupled to one another in the area of ​​a coupling point by means of a coupling device (60), and wherein an alignment aid with at least one alignment element (62.1, 68.2, 69) is provided, which is arranged and designed to align the transmission elements (64, 68) against each other in the area of ​​the to align the coupling point. [2] Sieve device according to claim 1, characterized by, that each of the transmission elements (64, 68) is coupled away from the coupling point to a joint, in particular to a cardan joint (62, 66), and that an alignment element (62.1) is designed in the form of an elastic component which stiffens one of the joints in such a way that the transmission element (64, 68) connected to the joint is held in a joining position raised relative to the direction of gravity, or that two alignment elements (62.1) are each designed in the form of an elastic component which each stiffen one of the joints in such a way that the transmission element (64, 68) connected to the joint is held in a joining position raised relative to the direction of gravity. [3] Sieve device according to claim 2, characterized by, that the cardan joints (62, 66) together with the transmission elements (64, 68) form a cardan shaft, and that the alignment element (62.1) surrounds at least one of the cardan joints (62, 66) at least partially in the form of a shrink sleeve. [4] Sieve device according to any one of claims 1 to 3, characterized by , that the transmission elements (64, 68) each have a pipe section (64.1 68.1), and that in the area of ​​the coupling point the two pipe sections (64.1, 68.1) are inserted into each other with their pipe ends and are connected to each other in a rotationally fixed manner in the joining area. [5] Sieve device according to any one of claims 1 to 4, characterized by, that the alignment element (69) of the alignment aid is held by means of a fastening section (69.1) in the area of ​​a free end of the first transmission element (64, 68), that the alignment element (69) has a centering receptacle (69.2) which is aligned with the second transmission element (64, 68), wherein it is preferably provided that the centering receptacle (69.2) has at least a partially circumferential funnel-shaped extension, in particular an internal cone, which extends in the direction towards the second transmission element (64, 68). [6] Sieve device according to any one of claims 1 to 5, characterized by , that the alignment element (69, 68.2) is designed as a shaped body and is pushed onto the free end of the first transmission element (64, 68) on its outer circumference, and that the shaped body preferably has a stop (69.3) which fixes the shaped body immovably on the first transmission element (64, 68) in the joining direction. [7] Sieve device according to any one of claims 1 to 6, characterized by , that the alignment aid as alignment element (68.2) has a support body attached to one of the transmission elements (64, 68) which is supported on a component of the sieve device that is stationary relative to the transmission elements (64, 68), and wherein a sliding fit is provided between the alignment element (68.2) and the stationary component, along which the alignment element (68.2) is guided displaceably in the direction of the joining direction. [8] Sieve device according to any one of claims 1 to 7, characterized by , that the two transmission elements (64, 68) are arranged inside a sheathing tube (22). [9] Sieve device according to claim 8, characterized by, that the alignment element (68.2) is guided radially outside on the inner circumferential surface of the sheathing tube (22) in a displaceable manner, forming a sliding fit in the direction of the longitudinal extension of the sheathing tube (22), and that preferably the alignment element (68.2) is connected in a radially non-adjustable manner to one of the transmission elements (64, 68). [10] Sieve device according to any one of claims 1 to 9, characterized by , that a limiting element (68.3) is provided that limits the adjustment movement of the alignment element (68.2) relative to the transmission element (64, 68). [11] Sieve device according to any one of claims 1 to 9, characterized by, that the excitation units (21) each have a motor unit (30) with an electric motor (32) which each drive a drive shaft (31), that the drive shaft (31) each drive at least one unbalance weight (40), that the drive shafts (31) are mechanically coupled to each other by means of the synchronization device (26), wherein each drive shaft (31) is coupled to one of the transmission elements (64, 68). [12] Sieve device according to any one of claims 1 to 10, characterized by , that the alignment element(s) (68.2, 69, 62.1) consists of a plastic material, in particular a foamed plastic part. [13] Sieve device according to any one of claims 1 to 12, characterized by , that the two transmission elements (64, 68) have different axial longitudinal extensions in the direction of the axis of rotation of the synchronization device (26).

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