Vibrating device with movable eccentric mass

Abstract

The invention relates to a vibration device (1), comprising: a first frame (2); a machine table (4), which is coupled to the first frame (2) so that the machine table can be moved relative to the first frame (2) at least in a main movement direction (3); a first eccentric mass (5), which is rotatably supported on the machine table (4), wherein the first eccentric mass (5) is coupled to a first drive motor (6); a second eccentric mass (7), which is rotatably supported on the machine table (4), wherein the second eccentric mass (7) is coupled to a second drive motor (8). The first eccentric mass (5) and the second eccentric mass (7) are arranged on the machine table (4) so as to be movable relative to the machine table (4) in the main movement direction (3).

Description

Technical Field

[0001] The invention relates to a vibration device and a method for operating the vibration device. Background Art

[0002] This type of vibrating device can for example be constructed as a corer for de-coring a casting. In addition, it is also conceivable that this type of vibrating device is constructed for performing sliding chip removal. In another further design, it is also conceivable that the vibrating device is constructed for conveying piece goods.

[0003] For example, AT 517133 A1 discloses a decoring machine. The decoring machine comprises a first machine frame, a machine table movably supported relative to the first machine frame for clamping a workpiece, two eccentric masses driven in opposite directions and supported on the machine table, and at least one drive motor arranged on the first machine frame. The force or torque flow from the at least one drive motor to the two eccentric masses is directed such that branches and / or junctions in the force / torque flow or devices for synchronizing the two eccentric masses are arranged on the first machine frame. Furthermore, the force / torque flow between the first machine frame and the machine table is guided by at least one belt directed to the eccentric masses.

[0004] A disadvantage of this arrangement is that the transmission for synchronizing the two unbalanced shafts or eccentric masses is subject to strong vibrations and the decorer / vibrator therefore has only a relatively short service life. Summary of the Invention

[0005] The object of the present invention is to overcome the disadvantages of the prior art and to provide a vibration device having an improved service life.

[0006] This object is achieved by the device and method according to the invention.

[0007] According to the present invention, a vibration device is constructed. The vibration device includes:

[0008] - First rack;

[0009] - a machine table coupled to the first machine frame such that the machine table is movable relative to the first machine frame at least in a main direction of movement;

[0010] a first eccentric mass, which is rotatably mounted on the machine table, wherein the first eccentric mass is coupled to a first drive motor;

[0011] A second eccentric mass is rotatably mounted on the machine table, wherein the second eccentric mass is coupled to a second drive motor.

[0012] The first eccentric mass and the second eccentric mass are arranged displaceably relative to the machine table in the vibration direction.

[0013] The vibration device according to the invention offers the advantage that, due to the arrangement of the first and second eccentric masses, which are movable in the main direction of movement, the two eccentric masses are synchronized in opposite directions by means of the first and second drive motors when operated in opposite directions of rotation. Only by the opposite synchronization of the first and second eccentric masses can a sufficient imbalance be generated to allow the machine table to be operated smoothly transversely to the main direction of movement while also operating the machine table.

[0014] Furthermore, it can be advantageous if the first eccentric mass and the second eccentric mass are coupled to one another by means of a coupling device, such that a movement of the first eccentric mass relative to the main direction of movement results in a movement of the second eccentric mass in the opposite direction. The use of the coupling device can improve the counter-synchronization of the first and second eccentric masses, so that mutual synchronization can be achieved even shortly after the vibration device is put into operation, or the counter-synchronization can be maintained over the entire operating period of the vibration device.

[0015] Furthermore, it can be provided that a pendulum mount is formed, which is pivotably mounted on the machine table about a pivot axis, wherein the first eccentric mass is coupled to the pendulum mount on a first side of the pivot axis, and

[0016] The second eccentric mass is coupled to the pendulum receptacle on the second side of the pivot axis. Surprisingly, particularly through this measure, very good counter-synchronization of the first eccentric mass and the second eccentric mass can be achieved.

[0017] Furthermore, provision can be made for a pendulum mount to be pivotally mounted on the machine table about a pivot axis, wherein the first eccentric mass is coupled to the pendulum mount on a first side of the pivot axis, and the second eccentric mass is coupled to the pendulum mount on a second side of the pivot axis. Excessive pivoting of the pendulum mount can be prevented by limiting the pivot angle, thereby reducing the time required for resynchronization.

[0018] The first end stop and the second end stop can be positioned such that the maximum pivot angle relative to the symmetrical position is between 30° and 5°, in particular between 25° and 7°, preferably between 15° and 10°.

[0019] Also advantageous is an embodiment according to which it can be provided that the first and second end stops 23 are configured as damping elements, in particular as rubber dampers. In particular, the use of damping elements leads to improved counter-synchronization of the first and second eccentric masses.

[0020] According to a further development, it is possible to arrange the first drive motor and the first eccentric mass coaxially with one another, wherein the first drive motor is rigidly coupled to the first eccentric mass, and to arrange the second drive motor and the second eccentric mass coaxially with one another, wherein the second drive motor is rigidly coupled to the second eccentric mass. This has the advantage that the first eccentric mass can be driven simply by the first drive motor, and the second eccentric mass can be driven simply by the second drive motor. The simplified design and the use of minimal components can improve the durability of the vibration device.

[0021] Furthermore, it can be expedient to couple the machine table to the first machine frame by means of spring elements, wherein the pivot axis is oriented parallel to the height extension of the spring elements. This has the advantage that the machine table can be oscillated relative to the first machine frame in the main direction of movement.

[0022] Furthermore, it can be provided that the first drive motor and the second drive motor are each designed as an asynchronous motor. In particular, when using asynchronous motors, the first eccentric mass and the second eccentric mass have the effect of being in anti-synchronized.

[0023] Furthermore, it can be provided that a workpiece receiving device for receiving a cast part is formed on the machine table, wherein the vibration device is designed for decoring the cast part, or the workpiece receiving device is designed for receiving a container with bulk material, wherein the vibration device is designed for slip processing.

[0024] In particular, it can be provided that the container is designed such that a vehicle wheel rim, in particular an aluminum wheel rim, can be received as a workpiece in the container, wherein blasting material, for example steel balls, is used for the slip machining.

[0025] Furthermore, it can be provided that the container has a closed cavity with a removable cover for inserting or removing the workpiece. The cavity can have a sieve-like structure on one of the side walls or the bottom and / or the top or the cover, so that dirt can be discharged from the cavity and the blasting material can be retained in the cavity.

[0026] Furthermore, it can be provided that the workpiece itself has a cavity, such as a cylinder block, and that the workpiece is arranged on the container such that the container and the workpiece together form a closed cavity for receiving the blasting material. In particular, it can be provided that the container has a recess into which the blasting material is received by gravity when the workpiece is changed. To change the workpiece, the workpiece table can be rotated into a position in which the blasting material is received by gravity in the recess. After the change, the workpiece table can be rotated again so that the blasting material is received in the cavity of the workpiece and can perform its blasting action there.

[0027] In a further embodiment variant, it can be provided that the workpiece receiving device is designed as a receiving conveyor trough, wherein a vibration device is used to convey the workpieces.

[0028] According to the present invention, a method for operating a vibration device having a first eccentric mass, the vibration device having a first machine frame and a machine table, the machine table being coupled to the first frame in such a way that the machine table is movable relative to the first frame at least in a main direction of movement, the vibration device having a first eccentric mass which is rotatably mounted on the machine table, wherein the first eccentric mass is coupled to a first drive motor, the vibration device having a second eccentric mass which is rotatably mounted on the machine table, wherein the second eccentric mass is coupled to a second drive motor, wherein the method comprises the following method steps:

[0029] - applying current to the first drive motor and the second drive motor to drive the first eccentric mass and the second eccentric mass;

[0030] - Processing or conveying a workpiece arranged on the machine table. In a first phase after current is initially supplied to the first drive motor and the second drive motor, the first eccentric mass and the second eccentric mass are moved relative to the machine table in the vibration direction until synchronization of the first eccentric mass and the second eccentric mass in opposite directions occurs.

[0031] The method according to the invention has the advantage that, due to the arrangement of the first and second eccentric masses, which are movable in the main direction of movement, the two eccentric masses are synchronized in opposite directions by means of the first and second drive motors when operated in opposite directions of rotation. Only by the opposite synchronization of the first and second eccentric masses can a sufficient imbalance be generated to operate the machine table transversely to the main direction of movement while maintaining a smooth operation of the machine table.

[0032] Countersynchronization of the first and second eccentric masses means that both eccentric masses assume an angular position of 0° relative to the main direction of motion or an angular position of 180° relative to the main direction of motion at the same time, but operate in opposite directions of rotation. Thus, at other times, the first eccentric mass has an angular position of 90° relative to the main direction of motion, and the second eccentric mass has an angular position of 270° relative to the main direction of motion. In other words, with countersynchronization transversely to the main direction of motion, the centrifugal forces of the two eccentric masses cancel each other out and intensify in the direction of the main direction of motion.

[0033] The method for sliding chips is defined in DIN 8589. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] For a better understanding of the present invention, the present invention will be explained in more detail with the help of the following drawings.

[0035] Here, each is shown in a very simplified schematic diagram:

[0036] Figure 1 A perspective view showing a first embodiment of a vibration device;

[0037] Figure 2 shows a perspective view of a first embodiment of a vibratory device with a workpiece table in a first angular position;

[0038] Figure 3 showing a perspective view of a first embodiment of a vibratory device with a workpiece table in a second angular position;

[0039] Figure 4 shows a perspective view of the first embodiment of the vibratory device with the workpiece table in a third angular position;

[0040] Figure 5 A top view showing a first embodiment of a vibration device;

[0041] Figure 6 A top view showing the pendulum receiving portion of the vibrating device in a first angular position;

[0042] Figure 7 A top view showing the pendulum receiving portion of the vibrating device in a second angular position;

[0043] Figure 8 A cross-sectional view showing a pendulum receiving portion of a vibrating device;

[0044] Figure 9 A top view showing a second embodiment of a coupling device for a vibration device;

[0045] Figure 10 A top view of a third exemplary embodiment of a coupling device for a vibration device is shown. DETAILED DESCRIPTION

[0046] First, it should be noted that identical components in the various described embodiments are provided with the same reference numerals or the same component names, with the disclosure contained throughout the entire description being transferable to the same components having the same reference numerals or the same component names. Positional designations selected in the description, such as top, bottom, side, etc., also refer to the directly described and illustrated figures and are transferred to the new position in the event of a change in position.

[0047] Figure 1 A first example of a vibration device 1 is shown in perspective. The vibration device 1 comprises a first machine frame 2. The vibration device 1 also comprises a machine table 4, which is mounted movably relative to the first machine frame 2 in a main direction of movement 3 and is used for clamping a workpiece.

[0048] Furthermore, the vibration device 1 comprises a first eccentric mass 5 which is rotatably mounted on the machine table 4 , wherein the first eccentric mass 5 is coupled to a first drive motor 6 .

[0049] Furthermore, the vibration device 1 comprises a second eccentric mass 7 which is rotatably mounted on the machine table 4 , wherein the second eccentric mass 7 is coupled to a second drive motor 8 .

[0050] The second eccentric mass 7 is driven in the opposite direction to the first eccentric mass 5. This can be achieved, for example, by having the first drive motor 6 and the second drive motor 8 have opposite directions of rotation. Alternatively, the two drive motors 6, 8 can have the same direction of rotation, and the first eccentric mass 5 and the second eccentric mass 7 can be driven in opposite directions by coupling one of the two drive motors 6, 8 to a transmission for reversing the direction of rotation.

[0051] Furthermore, it can be provided that the machine table 4 is coupled to the first machine frame 2 by means of a spring element 9. In particular, it can be provided that the spring element 9 is embodied in the form of a leaf spring.

[0052] Further means for connecting the machine table 4 to the first machine frame 2 are possible, but not necessary. This means that Figure 1 As shown, the machine table 4 can be connected to the first machine frame 2 only via the spring elements 9 .

[0053] In particular, it can be provided that the spring element 9 has a longitudinal extent which extends in a transverse direction transverse to the main direction of movement 3. In particular, it can be provided that a rotary suspension 21 for connecting the spring element 9 to the first machine frame 2 is respectively formed at a first and a second longitudinal end of the spring element 9, and that the machine table 4 is coupled to these respectively between the two longitudinal ends of the spring element 9.

[0054] Furthermore, it can be provided that the spring element 9 has a height extension 10. The height extension 10 is oriented orthogonally to the main direction of movement 3 and orthogonally to the transverse direction.

[0055] A workpiece receiving device 11 for receiving a workpiece or a workpiece carrier (not shown) can be arranged on the machine table 3 .

[0056] It is also advantageous if the first machine frame 2 is rotatably mounted in the second machine frame 13 about a horizontal axis of rotation 12. Figure 1 In order to rotate the first machine frame 2 and thus the machine table 4 relative to the second machine frame 13 , a rotary motor is provided which transmits its rotary motion to the first machine frame 2 , optionally with an intermediary transmission.

[0057] In another embodiment (not shown), it can also be provided that the machine table 4 is additionally rotatably mounted about a second rotation axis, which is configured orthogonally to the horizontal rotation axis. This has the advantage that the workpiece can be rotated so that, for example, the blasting material can reach all surfaces of the workpiece.

[0058] The second machine frame 13 can be connected to the machine base by a buffer element, for example an air-filled rubber bellows. Alternatively, it can be provided that the second machine frame 13 is not configured, and the first machine frame 2 is directly supported on the machine base.

[0059] As from Figure 1 It can further be seen that a coupling device 15 is provided, by means of which the first eccentric mass 5 and the second eccentric mass 7 are coupled to one another. In particular, provision can be made for the coupling device 15 to include a pendulum mount 16, on which the first eccentric mass 5 and the second eccentric mass 7 and optionally also the first drive motor 6 and the second drive motor 8 are arranged. The pendulum mount 16 is pivotally mounted about a pivot axis 17.

[0060] As from Figure 1 It can further be seen that provision can be made for the first eccentric mass 5 to be arranged on a first side 18 of the pivot axis 17 and for the second eccentric mass 7 to be arranged on a second side 19 of the pivot axis 17 .

[0061] The functions of the vibrating device 1 in the form of a decoring machine are as follows:

[0062] A workpiece, such as a casting with a casting core, is clamped to the machine table 4 by means of a workpiece receiving device 11. The first eccentric mass 5 is rotated in a first direction of rotation by means of a first drive motor 6. The second eccentric mass 7 is rotated in a second direction of rotation opposite to the first direction of rotation by means of a second drive motor 8. As a result, the elastically mounted machine table 4 is excited to oscillate in the main direction of motion 3 and to move alternately between a first and a second end position in this main direction of motion.

[0063] At the start of the rotational movement, the first eccentric mass 5 and the second eccentric mass 7 can be in any angular position relative to one another. The coupling device 15 allows the first eccentric mass 5 and the second eccentric mass 7 to be moved relative to one another and to the machine table 4 in the main direction of movement 3. This results in a counter-synchronization of the first eccentric mass 5 and the second eccentric mass 7.

[0064] The vibrating movement destroys or removes the casting cores in the workpiece. Since the machine table 4 is suspended by means of spring elements 9 in the form of leaf springs on the first machine frame 2, the machine table 4 also vibrates essentially only in the main direction of movement 3 without the need for additional guide means.

[0065] To facilitate the removal of the casting sand from the workpiece, the machine table 4 can be rotated 180° about the horizontal axis of rotation 12 and swung overhead. However, it is also conceivable that the machine table 4 is rotated only after the swung operation, so that the sand loosened by the swung operation falls out. In particular, it is provided that the machine table 4 rotates together with the first machine frame 2.

[0066] Furthermore, it is conceivable that the machine table 4 and / or the first machine frame 2 have a plurality of recesses through which the casting sand removed from the workpiece can fall.

[0067] exist Figures 2 to 4 The vibrating device 1 is also shown in a perspective view, wherein the same components as in the previous example are also used. Figure 1 To avoid unnecessary repetition, reference to or reference to the same reference numerals or component names in the previous Figure 1 For clarity, the Figures 2 to 4 Some components of the vibration device 1 are omitted.

[0068] exist Figures 2 to 4 In FIG, the rotation of the first frame 2 around the horizontal axis of rotation 12 can be seen. Figure 2 The first rack 2 is shown in a horizontal initial position. Figure 3 The first machine frame 2 is shown in FIG. 1 and is rotated at a slight angular position. Figure 4 The first machine frame 2 is shown in FIG. 1 at an angular position of 90°.

[0069] As from Figure 2 It can further be seen that the spring element 9 can be designed as a vertical leaf spring. The machine table 4 is coupled to the spring element 9 at its center by means of a fastening element 20 . The spring element 9 is coupled to the first machine frame 2 at both longitudinal ends by means of rotary mounts 21 . In particular, it can be provided that a plurality of spring elements 9 designed in this manner are coupled to the first machine frame 2 or to the machine table 4 . This allows the machine table 4 to be coupled movably relative to the first machine frame 2 in the main direction of motion 3 .

[0070] Figure 5 The vibration device 1 is shown in a top view, wherein the same components as before are also used. Figures 1 to 4 In order to avoid unnecessary repetition, it is pointed out or referred to the previous Figures 1 to 4 Detailed description.

[0071] exist Figure 6 and Figure 7 In FIG. 1 , two eccentric masses 5 and 7 as well as a pendulum receiving portion 16 are also shown in a top view, wherein Figure 6 and Figure 7 1 and 2 show the pendulum receptacle 16 at different pivot angles 24 .

[0072] As from Figures 5 to 7 As can be seen in FIG, provision can be made to form a first end stop 22 and a second end stop 23 , by means of which a pivot angle 24 can be defined.

[0073] In accordance with Figures 5 to 7 In the exemplary embodiment, the end stops 22 , 23 are designed in the form of rubber buffers.

[0074] Figure 8 A cross-section of the pendulum receiving portion 16 is shown, wherein the same components as previously used are also used. Figures 1 to 7 In order to avoid unnecessary repetition, it is pointed out or referred to the previous Figures 1 to 7 Detailed description. Figure 8 The section line in FIG is selected along the pivot axis 17 .

[0075] As from Figure 8 As can be seen in FIG, it can be provided that the coupling device 15 comprises a first bearing part 25 and a second bearing part 26, by means of which the pendulum receptacle 16 is pivotably supported about the pivot axis 17. The first bearing part 25 and the second bearing part 26 are arranged spaced apart from each other in the axial extension of the pivot axis 17.

[0076] Figure 9A top view of a further embodiment of a coupling device 15 for coupling the displacement movement of the first eccentric mass 5 and the second eccentric mass 7 relative to one another is shown, wherein the same components as in the previous embodiment are also used. Figures 1 to 8 In order to avoid unnecessary repetition, it is pointed out or referred to in the aforementioned Figures 1 to 8 Detailed description in .

[0077] As from Figure 9 As can be seen, it can be provided that the coupling device 15 comprises a first linear guide 27, by means of which the first eccentric mass 5 is supported displaceably in the main direction of movement 3 on the machine table 4. It can also be provided that the coupling device 15 comprises a second linear guide 28, by means of which the second eccentric mass 7 is supported displaceably in the main direction of movement 3 on the machine table 4.

[0078] Furthermore, the coupling device 15 may include a traction device 29 that can be pivoted about a first deflecting roller 30 or a second deflecting roller 31. The first eccentric mass 5 and the second eccentric mass 7 can be coupled to one another by means of the traction device 29 in such a way that a movement of the first eccentric mass 5 on a first side of the main direction of motion 3 causes a movement of the second eccentric mass 7 by the same amount on the opposite side of the main direction of motion 3. The traction device 29 can be designed, for example, in the form of a rope. Alternatively, it is also conceivable to design the traction device 29 in the form of a chain. In a further alternative, it is also conceivable to design the traction device 29 in the form of a V-belt or a toothed belt.

[0079] The traction means 29 can be a continuously encircling traction means which is tensioned around the first deflecting roller 30 and the second deflecting roller 31 , wherein the slide of the first linear guide 27 and the slide of the second linear guide 28 can be fastened to the first run section or to the opposite second run section of the traction means 29 .

[0080] Figure 10 A top view of a further embodiment of a coupling device 15 for coupling the displacement movement of the first eccentric mass 5 and the second eccentric mass 7 relative to one another is shown, wherein the same components as in the previous embodiment are also used. Figures 1 to 9 In order to avoid unnecessary repetition, it is pointed out or referred to the previous Figures 1 to 9 Detailed description.

[0081] As from Figure 10As can be seen, it can be provided that the coupling device 15 comprises a first linear guide 27, by means of which the first eccentric mass 5 is supported displaceably in the main direction of movement 3 on the machine table 4. It can also be provided that the coupling device 15 comprises a second linear guide 28, by means of which the second eccentric mass 7 is supported displaceably in the main direction of movement 3 on the machine table 4.

[0082] Furthermore, the coupling device 15 can include a gear wheel 32, which can be coupled to a first rack 33 and a second rack 34. The first eccentric mass 5 can be coupled to the first rack 33, and the second eccentric mass 7 can be coupled to the second rack 34. The gear wheel 32 can be arranged centrally between the first rack 33 and the second rack 34 so that a movement of the first eccentric mass 5 on a first side of the main direction of motion 3 causes the second eccentric mass 7 to move by the same amount on the opposite side of the main direction of motion 3.

[0083] These embodiments illustrate possible implementation variants, wherein it should be noted that the present invention is not limited to the particularly illustrated implementation variants of the present invention, but rather that different combinations of the individual implementation variants with one another are possible and this possibility of variation is within the capabilities of a person skilled in the art based on the teachings of the technical means of the present invention.

[0084] The scope of protection is determined by the claims. However, the claims should be interpreted with reference to the description and the drawings. Individual features or combinations of features from the various exemplary embodiments shown and described can constitute independent inventive solutions. The tasks underlying the independent inventive solutions can be found in the description.

[0085] All descriptions of value ranges in this specification should be understood as including any and all partial ranges therein. For example, the description 1 to 10 should be understood as including all partial ranges starting from the lower limit 1 and the upper limit 10, that is, all partial ranges starting with a lower limit of 1 or greater and ending with an upper limit of 10 or less, for example 1 to 1.7 or 3.2 to 8.1 or 5.5 to 10.

[0086] Finally, it should be pointed out that, for a better understanding of the construction, some elements are partially not shown to scale and / or are shown enlarged and / or reduced in size.

[0087] Reference Signs List

[0088] 1. Vibration device

[0089] 2First rack

[0090] 3 main motion directions

[0091] 4 machines

[0092] 5. First eccentric mass

[0093] 6First drive motor

[0094] 7 Second eccentric mass

[0095] 8 Second drive motor

[0096] 9 Spring elements

[0097] 10 Height extension

[0098] 11Workpiece receiving device

[0099] 12 horizontal rotation axis

[0100] 13 Second rack

[0101] 15 coupling device

[0102] 16 pendulum receiving part

[0103] 17 Swing axis

[0104] 18 First side

[0105] 19 Second side

[0106] 20 fastening elements

[0107] 21 Rotating Suspension

[0108] 22 first end stop

[0109] 23 Second end stop

[0110] 24 swivel angle

[0111] 25 first support member

[0112] 26 second support member

[0113] 27 first linear guide

[0114] 28 second linear guide

[0115] 29 traction device

[0116] 30 First steering roller

[0117] 31 Second steering roller

[0118] 32 gears

[0119] 33 first rack

[0120] 34 Second rack

Claims

1. A vibration device (1), comprising: - First rack (2); - a machine table (4) coupled to the first machine frame (2) such that the machine table is movable relative to the first machine frame (2) at least in a main movement direction (3); - a first eccentric mass (5), which is rotatably mounted on the machine table (4), wherein the first eccentric mass (5) is coupled to a first drive motor (6); - a second eccentric mass (7), which is rotatably mounted on the machine table (4), wherein the second eccentric mass (7) is coupled to a second drive motor (8), The invention is characterized in that a first eccentric mass (5) and a second eccentric mass (7) are arranged on a machine table so as to be movable relative to a machine table (4) in a main movement direction (3), and the first eccentric mass (5) and the second eccentric mass (7) are coupled to each other by means of a coupling device (15) so that a movement of the first eccentric mass (5) with respect to the main movement direction (3) causes the second eccentric mass (7) to move in the opposite direction.

2. The vibration device (1) according to claim 1, characterized in that A pendulum receptacle (16) is provided, which is received on a machine table (4) so as to be pivotable about a pivot axis (17), wherein a first eccentric mass (5) is coupled to the pendulum receptacle (16) on a first side (18) of the pivot axis (17), and a second eccentric mass (7) is coupled to the pendulum receptacle (16) on a second side (19) of the pivot axis (17).

3. The vibration device (1) according to claim 2, characterized in that A first end stop (22) and a second end stop (23) are provided, by means of which a pivot angle (24) of the pivot receptacle (16) about the pivot axis (17) is defined.

4. The vibration device (1) according to claim 3, characterized in that The first end stop (22) and the second end stop (23) are designed as damping elements.

5. The vibration device (1) according to claim 4, characterized in that The buffer element is a rubber buffer.

6. The vibration device (1) according to any one of claims 1 to 5, characterized in that The first drive motor (6) and the first eccentric mass (5) are arranged coaxially with each other, wherein the first drive motor (6) is rigidly coupled to the first eccentric mass (5), and the second drive motor (8) and the second eccentric mass (7) are arranged coaxially with each other, wherein the second drive motor (8) is rigidly coupled to the second eccentric mass (7).

7. The vibration device (1) according to any one of claims 2 to 5, characterized in that The machine table (4) is coupled to the first machine frame (2) by means of a spring element (9), wherein the pivot axis (17) is oriented parallel to the height extension (10) of the spring element (9).

8. The vibration device (1) according to any one of claims 1 to 5, characterized in that The first drive motor (6) and the second drive motor (8) are each configured as an asynchronous motor.

9. The vibration device (1) according to any one of claims 1 to 5, characterized in that A workpiece receiving device (11) for receiving a casting is constructed on the machine table (4), wherein the vibration device (1) is constructed for de-coring the casting, or the workpiece receiving device (11) is constructed for receiving a container with bulk material, wherein the vibration device (1) is constructed for slip processing.

10. A method for operating a vibration device (1), the vibration device comprising: a first frame (2); a machine table (4), the machine table being coupled to the first frame (2) so that the machine table can be moved relative to the first frame (2) at least in a main movement direction (3); a first eccentric mass (5), the first eccentric mass being rotatably supported on the machine table (4), wherein: A first eccentric mass (5) is coupled to a first drive motor (6); a second eccentric mass (7) is rotatably supported on a machine table (4), wherein the second eccentric mass (7) is coupled to a second drive motor (8); The method comprises the following steps: - applying current to the first drive motor (6) and the second drive motor (8) for driving the first eccentric mass (5) and the second eccentric mass (7), wherein the first eccentric mass (5) and the second eccentric mass (7) are driven in opposite directions of rotation; - processing or conveying workpieces arranged on the machine table (4), It is characterized in that, in a first phase after the first drive motor (6) and the second drive motor (8) begin to be supplied with current, the first eccentric mass (5) and the second eccentric mass (7) move in the vibration direction relative to the machine table (4) until the first eccentric mass (5) and the second eccentric mass (7) are synchronized in the opposite direction, and the first eccentric mass (5) and the second eccentric mass (7) are coupled to each other by means of a coupling device (15) so that the movement of the first eccentric mass (5) with respect to the main movement direction (3) causes the second eccentric mass (7) to move in the opposite direction.

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