Screening device

Abstract

The invention relates to a screening device having a screening tray, in which or on which at least one screening plate liner is arranged in a screening region between lateral screening plates arranged at a distance from one another, a vibration driver capable of vibrating the screening tray having two exciter units mechanically coupled to one another by a synchronization device, according to the invention, the protective sleeve extends in the region between the lateral screening plates, in which the synchronizing device is accommodated at least in sections, and the at least one exciter unit has a motor unit with a motor housing mounted in the hole or hole region of the lateral screening plate. The sheath tube has a sheath tube holder in the region of at least one lateral screening plate, which is arranged in the inner region of the lateral screening plate, with at least one mating mount into which a fastening element having a fastening section is pressed in a non-rotatable and axially non-displaceable manner, studs that guide fastening elements pass through the holes of the lateral screen plate and the fastening flanges of the motor housing to connect the motor housing to the lateral screen plate, so that the construction can be particularly easily installed.

Description

TECHNICAL FIELD

[0001] The invention relates to a screening device having a screening tray, in or on which at least one screening liner is arranged in a screening region between two lateral screening plates arranged at a distance from one another, wherein the screening tray can be vibrated by a vibration drive, wherein the vibration drive has two exciter units, wherein the exciter units are mechanically coupled to one another by a synchronization device, wherein a sheath tube extends in the region between the two lateral screening plates, the synchronization device is at least sectionally accommodated in the sheath tube, and wherein at least one of the exciter units has a motor unit, which has a motor housing, and which is mounted in a bore or in the region of a bore of one of the lateral screening plates.

[0002] Such screening devices are used for screening and sizing mineral screening material. They can be used, in particular, as pre- or post-screening devices, preferably in a material processing device for processing, in particular for crushing, mineral material. The screening device can thus be arranged upstream or downstream of a crushing device in the material flow direction of the material processing device. BACKGROUND

[0003] From the prior art, screening devices are known which have two exciter units in the form of unbalanced drives ("flange vibration motors") which are connected laterally in flange fashion to the screening tray. In order to synchronize the unbalance on the left and right, the exciter units are interconnected by a shaft for common rotation. The shaft is surrounded by a sheath tube in order to protect it from dust and contact. For assembly, the unbalanced drive must first be inserted at one end. The unbalanced drive is then fitted at the opposite end. The unbalanced drives are mounted by two people simultaneously from the inside and outside of the lateral screening plates. SUMMARY

[0004] The invention solves the problem of providing a screening device of the type described above which makes assembly and maintenance of the vibration drive simple.

[0005] The problem is solved in that the sheath tube has a sheath tube holder, in particular a flange, in the region of at least one lateral screening plate, which is arranged in the inner region of the lateral screening plate, and which has at least one mating mount, wherein a fastening element having a fixing section is pressed into the mating mount in a rotationally fixed and axially immovable manner, and wherein a stud of the fastening element is guided through a bore in the lateral screening plate and a fastening flange of the motor housing in order to connect the motor housing to the lateral screening plate.

[0006] The jacket tube can be installed in a screening tray for mounting a vibration drive. The fastening elements, which are part of the jacket tube, are inserted through aligned holes in the lateral screening plates and the motor housing. This is easily achieved, since the fastening elements are firmly and captively connected to the jacket tube holder. The jacket tube is then held in a preassembled position between the lateral screening plates. The skilled person can now easily complete the installation from the outside of the screening plates by fitting suitable fixing elements, such as nuts, to the fastening elements.

[0007] If maintenance is required, the exciter unit can also be easily replaced if the fastening elements are first inserted through the holes in the lateral screening plates and then through the holes in the motor housing, when viewed from the inside of the screening tray. The motor housing can then be removed, wherein the jacket tube can remain installed in the screening tray and does not have to be disassembled.

[0008] In summary, the invention provides the user with a particularly easy-to-install and easy-to-maintain design.

[0009] According to a variant of the invention, it can be provided that the fastening elements have a head which adjoins the fixing section and which rests on an end of the fastening piece, which faces away from the lateral screening plates. This results in a form-fit support of the fastening elements in the axial direction of the fastening elements. As a result, the motor housing and the jacket tube can be fastened firmly at the same time.

[0010] A preferred variant of the invention provides that the stud of the fastening element has a threaded section at its free end, onto which a nut is screwed, which clamps the motor housing to the lateral screening plates. This ensures that the motor housing is reliably attached to the lateral screening plates, wherein the installation can easily be carried out in the area outside the lateral screening plates.

[0011] If it is provided that the fixing section has a surface structure with protrusions and recesses on its outer circumference and the protrusions are pressed into the inner circumference of the mating mounting piece, which is designed as a drilled hole, so that a form-fit connection is established between the fixing section and the mating mounting piece in the circumferential direction of the fixing section, the fastening elements can be easily installed on the jacket tube holder.

[0012] A possible variant of the application can be that the motor housing accommodates an electric motor which drives a drive shaft, wherein both ends of the drive shaft are led out of the motor housing at opposite ends, the drive shaft has mounts in the region of its ends, to each of which an unbalance weight is attached, and the motor housing is inserted into a hole in the lateral screening plate. Since the motor housing is inserted into the hole, a load distribution is achieved which releases the fixing section of the fastening element in a stress-advantageous manner. As a result, the connection between the fixing section and the sheath tube holder is subjected to little or no bending stress. To this end, it can be provided in particular that a cross section which extends perpendicular to the rotational axis of the drive shaft intersects the fixing section of the fastening element and the electric motor, and / or that the drive shaft is mounted by two bearings which are fastened to a bearing holder of the motor housing, and that the fixing section of the fastening element is arranged between the two bearings in the direction of the rotational axis of the drive shaft.

[0013] The screening device according to the application can be that the sheath tube has two tube sections which can be telescopically extended relative to one another in the direction of the rotational axis of the drive shaft of the motor unit, and each tube section carries a flange at its end assigned to the assigned lateral screening plate and is connected to the assigned lateral screening plate by a fastening element. Thus, the sheath tube can first be compressed for installation in the screening tray and then telescopically extended outwards in the installed position.

[0014] If it is provided that in the preassembled position of the sheath tube the distance in the direction of the longitudinal extent of the sheath tube from the free end of the fastening element connected to the first flange to the free end of the fastening element connected to the second flange is less than the clear distance between the lateral screening plates in this direction, and in the assembled position the distance between the free ends of the fastening elements is greater than the clear distance between the lateral screening plates, so that the free ends protrude beyond the outside of the lateral screening plates, the assembly is particularly easy. Thus, in the preassembled position the sheath tube can be easily inserted into the screening tray. In the installed position the fastening elements hold the sheath tube in a form-fitting manner in the direction of gravity, so that the sheath tube can then be easily connected to the lateral screening plates from the outside, for example screwed to the lateral screening plates.

[0015] A conceivable variant of the application can be that the tube sections are telescopically inserted into one another so that the outer circumference of the first tube section rests against the inner circumference of the second tube section to form a sliding guide in the direction of the longitudinal extent of the sheath tube, and are preferably arranged so that the tube sections can be rotated relative to one another in the circumferential direction. This significantly facilitates the assembly, in addition, the adjacent circumferential regions at least sectionally seal the interior of the sheath tube from the surroundings.

[0016] In order to optimize the vibration behavior of the vibration drive, it can be provided that the exciter units are mechanically coupled to one another by means of a synchronization device, wherein the synchronization device has two transmission elements which are releasably coupled in the region of the coupling point by means of a coupling device and are coupled to one another for joint rotation.

[0017] In order to further improve the assembly or maintenance of the vibration drive, it can be provided that an orientation aid having at least one orientation element is provided, which is arranged and designed to orient the transmission elements relative to one another in the region of the coupling point during the joining process of the two transmission elements. This means that during the joining movement, the transmission elements can be oriented in the assembly position by means of the at least one orientation element in order to enable the transmission elements to be joined, preferably without the need for external access to the coupling point. This significantly facilitates assembly. It also reduces the number of components required.

[0018] In order to compensate for any positional tolerances of the two exciter units, it can be provided that the coupling device has a cardan shaft, wherein the transmission elements have tube sections of non-circular cross-section, which are inserted into one another, each tube section carrying a cardan joint, and each cardan joint is connected to the drive shaft by means of a coupling piece. BRIEF DESCRIPTION OF DRAWINGS

[0019] The application is explained in more detail below on the basis of exemplary embodiments shown in the drawings.

[0020] Figure 1 is a side view of a schematic representation of a screening device in vertical section;

[0021] Figure 2 is shown Figure 1 is a vibration drive of the screening device shown in Figure 1 is shown in the sectional plane II-II in

[0022] Figure 3 is shown in the sectional plane III-III in Figure 1 is shown in detail

[0023] Figure 4 is shown in the sectional plane IV-IV in Figure 2 is shown in detail

[0024] Figure 5 is shown

[0025] Figure 6 is shown

[0026] Figure 7 is shown in the sectional plane VII-VII in Figure 6 is shown in the sectional plane VII-VII in DETAILED DESCRIPTION

[0027] Figure 1 A screening device as commonly used in material processing devices, in particular in a rock crusher, is shown. The screening device has a screening tray 10. The screening tray 10 has two spaced-apart lateral screening plates 21 between which a screening area is formed.

[0028] At the bottom end, the screening tray 20 is closed by a bottom 12. At least one screening liner 14, 15 is arranged inside the screening tray 10 spaced apart from the bottom 12. In the exemplary embodiment, two screening liners 14, 15 are installed.

[0029] A conveying area 13 is formed in the area above the upper screening liner 14. During operation, the screening tray 10 is vibrated by a vibration drive 20. As a result of these vibratory movements, the screenings deposited on the upper screening liner 14 are conveyed along the conveying area 13, in Figure 1 from left to right. The first fraction is screened on the screening liner 14 and carried away via the screening liner 14. The screened material falls on the lower screening liner 15 and is subjected to a further screening process. The material screened out is again carried away on the lower screening liner 15, and the fine fraction that has fallen through the screening liner 15 is discharged via the bottom 12.

[0030] The vibration drive 20 is shown in more detail in Figure 2 The vibration drive 20 has a modular design and has two exciter units 21, as shown in this figure. Each exciter unit 21 is attached in the area of a lateral screening plate 11. The two exciter units 21 are coupled to one another via a synchronization device 26.

[0031] With reference to Figure 3 , the structure of the exciter unit 21 is first explained in more detail. As shown in this figure, the exciter unit 21 can be designed to produce an imbalance by one or more imbalance weights 40 arranged eccentrically relative to a drive shaft 31. This imbalance produces vibrations in the screening tray 10.

[0032] The exciter unit 21 can have a motor unit 30, which includes the drive shaft 31. The drive shaft 31 is driven by a motor rotor of an electric motor 32. The drive shaft 31 is rotatably mounted on opposite ends of the electric motor 32 by bearings 33. The electric motor 32 is accommodated in a motor housing 34. The bearings 33 can be mounted in the motor housing 34 itself. However, it is also conceivable, as Figure 3As shown in Fig. 2, separate bearing retainers 35, 36 are attached to the motor housing 34, in each of which one of the bearings 33 is mounted. This allows a modular design to be achieved, in which the pre-fabricated bearing retainers 35, 36 can be mounted from a kit with different motor housings 34.

[0033] A fastening flange 34.1 can be provided for fastening the motor unit 30 to the screening deck 10, which can in particular be integrally connected to the motor housing 34.

[0034] The motor unit 30 can preferably be fastened in an opening 11.1 in the lateral screening plate 11. The motor housing 34 can be inserted into this hole 11.1. A hole is drilled in the lateral screening plate 11 to secure the motor unit 30. These drilled holes are aligned with the holes 34.2 of the mounting flange 34.1. The motor unit 30 is fastened to the lateral screening plate 11 by fastening elements 25, which are inserted through the drilled holes 34.2 aligned in the lateral screening plate 11 and in the fastening flange 34.1, as will be explained in more detail below.

[0035] As Figure 3 Further shown in Fig. 2, the drive shaft 31 can have a mounting 37, 38 at each of its two ends. An unbalance weight 40 is connected to each of these mountings 37, 38 for co-rotation. The unbalance weight 40 has a separate weight 41 with a drilled hole. This separate weight 41 is pushed onto the mounting 37, 38 of the drive shaft 31 through this drilled hole.

[0036] As Figure 2 shown in Fig. 3, depending on the configuration of the system, it can now be necessary to use additional unbalance masses. For this purpose, one or more additional weights 42 can be provided in addition to the separate weight 41, which are connected directly or indirectly to the drive shaft 31 for co-rotation at one or both ends of the drive shaft 31.

[0037] As Figure 2 shown in Fig. 4, the additional weight 42 can be connected directly to the single weight 41. For this purpose, it can be provided that the single weight 41 is provided with a stud bolt 43, onto which the drilled hole of the additional weight 42 is pushed. This allows the additional weight 42 to be connected to the single weight 41 by screwing a nut 44 onto the stud bolt 43, which clamps the additional weight 42 firmly to the single weight 41.

[0038] Preferably, the masses at both ends of the drive shaft 31 are equal or at least approximately equal, in order to achieve a uniform load on the drive shaft 31.

[0039] Figure 3It is shown that the motor unit 30 can be equipped with a support device, preferably a lifting eye 39. The lifting eye 39 can be screwed into the outer end of the drive shaft 31 in the area of the mounting 37. The support device can be used to attach the motor unit 31 to the auxiliary device and to handle it more easily for assembly purposes to simplify assembly.

[0040] As Figure 2 shown, the two exciter units 21 on both ends of the screening tray 10 can be constructed similarly in principle, so that reference can be made to the above explanations. Preferably, the exciter units 21 are identical or substantially identical in design in order to reduce the number of components and assembly work.

[0041] In the outer lateral area of the designated lateral screening plate 11, a cover 50 is used to cover the exciter unit 21, which is preferably connected to the designated bearing holder 36. The cover 50 covers the rotating components of the motor unit 30 on the outside, thus avoiding any risk of damage there.

[0042] Figure 1 And Figure 3 It is also shown that the part of the motor unit 30 that protrudes beyond the lateral screening plate 11 on the outside can be completely or at least largely covered by a protective cover 70 at the top in the direction of gravity. This protective cover 70 protects the motor unit 30 from mechanical impacts of falling components. The protective cover 70 can be made from a steel sheet blank as a punched and bent part.

[0043] Figure 2 And Figure 3 It is shown that a sheath tube 22 extends between the two lateral screening plates 11. The sheath tube 22 has two tube sections 22.1, 22.2 that are pushed into one another. The tube sections 22.1, 22.2 of the sheath tube 22 each have a flange 23, 24 at their end facing the lateral screening plate 11. The flanges 23, 24 are equipped with mating mounts 23.1 (see Figure 3 ) that are similar in shape to drilled holes.

[0044] In order to fasten the sheath tube 22 between the lateral screening plates 11, the two tube sections 22.1, 22.2 are pushed into one another until the tube ends rest against the flanges 23, 24. The length of the sheath tube 22 is then less than the clear distance between the lateral screening plates 11. Thus, the sheath tube 22 can easily enter the area between the lateral screening plates 11.

[0045] The fastening element 25 already mentioned above is used to fasten the sheath tube 22 to the lateral screening plates 11. The fastening element 25 is designed as a mating stud and is shown more clearly in Figure 5 .

[0046] As Figure 5The fastening element 25 has a head 25.1. The head 25.1 is integrally connected to a stud 25.2. A fixing section 25.3 is formed on the stud 25.2 in the transition area between the head 25.1 and the stud 25.2. The fixing section 25.3 has a surface structure with protrusions and recesses. Opposite the head 25.1, the fastening element has a threaded section 25.4.

[0047] The fastening element 25 can be a plug-in stud 25 which is first inserted through the mating mount 23.1 of the flange 23. In the assembled state, the fixing section 25.3 rests in the mating mount 23.1. The mating mount 23.1 is designed as a drilled hole, wherein the diameter of the drilled hole is smaller than the outer diameter of the fixing section 25.3. Thus, the fixing section 25.3 can be pressed into the mating mount 23.1, wherein the above-mentioned protrusions of the fixing section 25.3 drill into the inner plate of the mating mount 23.1. In this way, the fixing section 25.3 forms a form-fit connection of the flange 23 and the fastening element 25 in the circumferential direction of the stud 25.2.

[0048] Figure 3 The stud 25.2 of the fastening element 25 is shown inserted through a drilled hole in the lateral screening plate 11 and through a drilled hole 34.2 of the fastening 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 fastening element 25 can be used to connect the motor housing 34 to the lateral screening plate 11 and at the same time to connect the specified tube sections 22.1, 22.2 to the lateral screening plate 11.

[0049] The installation is very simple. As described above, the sheath tube 22 only has to be placed between the two lateral screening plates 11. The two tube sections 22.1, 22.2 can be telescoped into each other so that the clear dimension between the lateral screening plates 11 is greater than the distance between the free ends of the studs 25.2 of the fastening elements 25, which are pre-installed in the mating mounts 23.1 and are fastened in the two flanges 23. If the studs 25.2 are aligned with the drilled holes in the lateral screening plates 11, the tube sections 22.1, 22.2 only have to be moved outward so that the threaded sections 25.4 are inserted through the lateral screening plates 11. Thus, the sheath tube 22 remains in a pre-assembled position. There is no longer any need to access from the inside of the screening tray 10 for further assembly. The following assembly steps can be carried out from the outside of the screening tray 10.

[0050] In particular, the two motor units 30 can now be attached from the outside to the lateral screening plate 11 and the nuts 34.4 are fastened on the outside. Since the fixing sections 25.3 of the fastening elements 25 remain confined and non-rotatable in the flanges 23, 24, the fastening elements 25 no longer have to be held from the inside by the screening tray 10 when the nuts 34.4 are tightened. When the nuts 34.4 are tightened, the two tube sections 22.1, 22.2 are further retracted outwards so that they can compensate for any positional tolerances of the lateral screening plate 11.

[0051] It can be provided that a sealing element 34.3 is arranged between the flanges 23, 24 to prevent dust from entering the area enclosed by the sheath tube 22. The sealing element 34.3 can for example be designed as a circumferential sealing ring which is arranged between the flanges 23, 24 and the inside of the lateral screening plate 11.

[0052] As shown in Figure 2 The two exciter units 21 are mechanically coupled to one another by means of a synchronization device 26. The synchronization device 26 serves to synchronize the rotational movement of the drive shafts 31 of the motor units 30.

[0053] As shown in Figure 2 The synchronization device 26 keeps the center of gravity of the unbalance weights 40 of the exciter units 21 at the same angular position or at least at approximately the same angular position in the circumferential direction.

[0054] The synchronization device 26 can comprise a coupling device 60 as shown in Figure 6 and Figure 7 The coupling device 60 can have couplings 61, 65 at opposite ends, each of which is connected to one of the drive shafts 31 of the motor units 30 for co-rotation as shown in Figure 2 .

[0055] To this end, a holder 45 can be connected to the drive shafts 31 for co-rotation. The designated end of the coupling device 60 is connected to this holder 45 by means of a threaded connection 46.

[0056] A universal joint 62 is connected to each coupling 61. 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 interconnected, in particular for co-rotation.

[0057] The two transmission elements 64, 68 can be or have tube sections 64.1, 68.1. The tube sections 64.1, 68.1 can have a non-circular cross-section and are pushed into one another in the region of the connection point as shown in Figure 7 The cross-section of the tube sections 64.1, 68.1 in the connection region of the connection point is designed such that they form a form-fit connection in the circumferential direction when engaged.

[0058] As shown in Figure 7 , the universal joints 62, 66 can have fasteners 63, 67 which are fitted into the end of the tube sections 64.1, 68.1 which faces away from the coupling point, in order to form a connection between the universal joints 62, 66 and the tube sections 64.1, 68.1 for co-rotation.

[0059] As shown in Figure 6 and Figure 7 , a directional aid is used which is designed and arranged to orient at least one of the transmission elements 64, 68 in its installed position during the joining movement of the exciter unit 21 on the lateral screening deck 11. The oriented assembly position should be such that the two transmission elements 64, 68 engage without the need for the operator to approach the coupling point.

[0060] Preferably, the sheath tube 22 is closed in the region of the connection point, which significantly simplifies its design. Alternatively, it can also be provided that only an inspection opening is incorporated in the region of the coupling point in order to monitor the joining process and to correct it if necessary.

[0061] The directional aid has at least one directional element 62.1, 68.2, 69.

[0062] The individual directional elements 62.1, 68.2, 69 are explained in more detail below. As shown in Figure 6 and Figure 7 , the directional element 62.1 can be formed and arranged to stabilize one of the universal joints 62, 66 in the installed position or at least approximately in the installed position.

[0063] To this end, it can be provided that the directional element 62.1 is designed in the form of an elastic component which supports one of the universal joints 62, 66 such that the transmission element 64, 68 connected to the joint remains in an elevated joining position relative to the direction of gravity.

[0064] As shown, the directional element 62.1 can be formed by a plastic shrink tube which surrounds the universal joint 62, 66. The shrink tube holds the transmission element 64 in its elevated orientation relative to the direction of gravity, as shown in Figure 6 and Figure 7 , or at least approximately in the shown position.

[0065] In addition or alternatively, the directional aid can also have a directional element 68.2, as shown in Figure 6 . This directional element 68.2 can preferably be formed by a molded body which is pushed onto the outer circumference of one of the transmission elements 64, 68. Figure 2The outer circumference of this orientation element 68.2 is shown to be supported on the inner contour of the jacket tube 22. It can be supported on the inner plate of the jacket tube 22 along the entire circumference or only along a part of the circumference. In this way, the connected transmission element 68 is oriented in its installed position or approximately in its installed position relative to the stationary jacket tube 22.

[0066] The transmission element 68 can also carry a limiting element 68.3. As shown, the latter can be integrally connected to the transmission element 68. The limiting element 68.3 serves to limit the displacement movement of the orientation element 68.2 attached to the transmission element 68. Figure 7

[0067] Additionally or alternatively, it can be provided to use an orientation element 69, which is attached to one end of the transmission element 64, 68 by an attachment section 69.1. The mounting movement of the orientation element 69 on the transmission element 64, 68 is limited by a stop 69.3 of the orientation element 69.

[0068] For example, this stop 69.3 can hit the free end of the transmission element 68 to which the orientation element 69 is attached. The orientation element 69 has a centering mount 69.2, which is oriented towards the second transmission element 64. This centering mount 69.2 can be designed in the form of a funnel-shaped extension, as shown in Figure 7

[0069] To install the exciter unit 21, one of the exciter units 21 is first mounted on the specified lateral screening plate 11 as described above. The transmission element 64, 68 connected to this exciter unit 21 is inserted into the jacket tube 22. If the orientation aid is such that the orientation element 62.1 supporting the cardan joint 62 is used, the transmission element 64 is already oriented in its approximately installed position.

[0070] If the orientation element 68.2 is used, the connected transmission element 68 is centered in its approximately installed position relative to the jacket tube 22.

[0071] When the two exciter units 21 are now moved towards each other, the free end of the transmission element 64 penetrates into the centering mount 69.2 of the orientation element 69 and is oriented such that the two transmission elements 64, 68 can fit into each other, as shown in Figure 7

[0072] If the non-circular cross-section of the transmission elements 64, 68 does not exactly match, this can be corrected by slightly twisting one of the exciter units 21 until there is an exact match and the transmission elements 64, 68 can finally be inserted into each other.

[0073] ​​​Finally, the fastening elements 25 can be used to clamp the exciter unit 21 to the lateral screening plate 11, as explained above, and the assembly is complete.

Claims

1. A screening device with a screening tray (10) in which or on which at least one screen liner (14, 15) is arranged in a screening region between two lateral screening plates (11) arranged at a distance from one another, wherein the screening tray (10) is vibratable by means of a vibration drive (20), wherein the vibration drive (20) has two exciter units (21), wherein the exciter units (21) are mechanically coupled to one another by means of a synchronization device (26), wherein a jacket tube (22) extends in the region between the two lateral screening plates (11), the synchronization device (26) is at least sectionally accommodated within the jacket tube (22), and wherein at least one exciter unit has a motor unit (30) which has a motor housing (34) and which is mounted in a bore (11.1) or in the region of a bore (11.1) of one lateral screening plate; characterized in that: the jacket tube (22) has a jacket tube holder in the region of at least one lateral screening plate (11), which is arranged in an inner region of the lateral screening plate (11) and which has at least one mating mount (23.1), wherein a fastening element (25) having a fixing section (25.3) is press-fitted into the mating mount (23.1) in a rotationally fixed and axially immovable manner, and a stud (25.2) of the fastening element (25) is guided through a bore in the lateral screening plate (11) and a fastening flange (34.1) of the motor housing (34) in order to connect the motor housing (34) to the lateral screening plate (11).

2. The screening apparatus of claim 1, wherein, the fastening element (25) has a head (25.1) which adjoins the fixing section (25.3) and which rests on an end of the jacket tube holder which faces away from the lateral screening plate (11).

3. Sieving device according to claim 1 or 2, characterized in that the stud (25.2) has a threaded section (25.4) at its free end, onto which a nut (34.4) is screwed, which clamps the motor housing (34) to the lateral screening plate (11).

4. The screening device according to claim 1 or 2, characterized in that the fixing section (25.3) has a surface structure which has protrusions and recesses on its outer circumference, and the protrusions are press-fitted into an inner circumference of the mating mount (23.1) which is designed as a drilled hole, such that a form-fit connection is established between the fixing section (25.3) and the mating mount (23.1) in the circumferential direction of the fixing section (25.3).

5. The screening device according to claim 1 or 2, characterized in that The motor housing (34) accommodates an electric motor (32) which drives a drive shaft (31), wherein both ends of the drive shaft (31) are led out of the motor housing (34) at opposite end portions, the drive shaft (31) has a mounting (37, 38) in the region of its end portions, to each of which a counterweight (40) is attached, and the motor housing (34) is inserted into a hole (11.1) of the lateral screening plate (11).

6. The screening apparatus of claim 5, wherein, A cross section extending perpendicular to the rotation axis of the drive shaft (31) intersects the fastening element (25) and the electric motor (32).

7. The screening apparatus of claim 5, wherein, The drive shaft (31) is mounted by two bearings (33) which are fastened to bearing holders (35, 36) of the motor housing (34), and the fastening element (25) is arranged between the two bearings (33) in the direction of the rotation axis of the drive shaft (31).

8. The screening device according to claim 1 or 2, characterized in that The sheath tube (22) has a first tube section (22.2) and a second tube section (22.1) which are telescopable relative to one another in the direction of the rotation axis of a drive shaft (31) of the motor unit (30), and both the first tube section (22.2) and the second tube section (22.1) carry a flange (23, 24) at their end assigned to the assigned lateral screening plate (11) and are connected to the assigned lateral screening plate (11) by a fastening element (25).

9. The screening apparatus of claim 8, wherein, In the preassembled position of the sheath tube (22), the distance in the direction of the longitudinal extent of the sheath tube (22) from the free end of the fastening element (25) connected to the first flange (23) to the free end of the fastening element (25) connected to the second flange (24) is less than the clear distance between the lateral screening plates (11) in this direction, and in the assembled position this distance between the free ends of the fastening elements is greater than the clear distance between the lateral screening plates (11) so that the free ends protrude beyond the outside of the lateral screening plates (11).

10. The screening apparatus of claim 8, wherein, The first tube section (22.2) and the second tube section (22.1) are telescopably inserted into one another so that the outer circumference of the first tube section (22.2) rests against the inner circumference of the second tube section (22.1) to form a sliding guide in the direction of the longitudinal extent of the sheath tube (22).

11. The screening apparatus of claim 1 or 2, wherein, The exciter units (21) are mechanically coupled to one another by a synchronization device (26), wherein the synchronization device (26) has two transmission elements (64, 68) which are releasably coupled in the region of a coupling point by a coupling device (60) and are coupled to one another for co-rotation.

12. The screening apparatus of claim 11, wherein, Orientation aids having at least one orientation element (62.1, 68.2, 69) are provided, which are arranged and designed to orient the transmission elements (64, 68) relative to one another in the region of the coupling point during the joining process of the two transmission elements (64, 68).

13. The screening apparatus of claim 12, wherein, The coupling device (60) has a cardan shaft, wherein the transmission elements (64, 68) have tube sections (64.1, 68.1) of non-circular cross-section, which are inserted into one another, each tube section (64.1, 68.1) has a cardan joint (62, 66) respectively, and the cardan joints (62, 66) are each connected to the drive shaft (31) by a coupling (61, 65).

14. The screening apparatus of claim 1, wherein, The sheath tube holder is a flange (23, 24).

15. The screening apparatus of claim 2, wherein, The head (25.1) rests on an end of the flange (23, 24) facing away from the lateral screening deck (11).

16. The screening apparatus of claim 10, wherein, The first tube section (22.2) and the second tube section (22.1) are rotatable relative to one another in a circumferential direction.

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