CN210178843U - Rotary disc or rotary ring driving device - Google Patents

Abstract

The utility model belongs to the field of automation equipment, and discloses a turntable or swivel driving device, which comprises a centering wheel train, a first supporting wheel train and at least one adjustable driving device; the first supporting wheel train comprises a plurality of first supporting wheels which can be in rolling contact with the lower end surface of the rotating disc or the rotating ring or the extending body of the rotating disc or the rotating ring; the centering wheel train comprises a plurality of centering wheels which can be in rolling contact with the side surface of the rotary table or the rotary ring or the extension body thereof; the adjustable driving device comprises a driving mechanism, a first driving wheel and an elastic pressing assembly, the driving mechanism is rotatable, an output end of the driving mechanism is in transmission connection with the first driving wheel, the first driving wheel is in rolling butt joint with the upper end face, the lower end face and/or the side face of the turntable or the rotating ring or an extending body of the turntable or the rotating ring, the turntable or the rotating ring is driven to rotate, and the elastic pressing assembly is connected with a shell of the driving mechanism and drives the first driving wheel to be always in butt joint with the turntable or the rotating ring. The utility model discloses can drive the carousel or the swivel of arbitrary size, actuating mechanism arranges in a flexible way, simple structure, and is with low costs.

Description

Rotary disc or rotary ring driving device

Technical Field

The utility model relates to an automation equipment field especially relates to a carousel or swivel drive arrangement.

Background

The conventional driving method of the turntable is generally to drive the central shaft of the turntable to rotate the turntable. The driving mode of the rotating ring is realized by driving a rotating mechanism arranged in the central area of the rotating ring. The existing driving mode of the turntable or the rotating ring is more suitable for driving the turntable or the rotating ring with smaller diameter. For the driving of a turntable or a swivel with a larger diameter, the driving mode is not suitable any more due to the higher requirements on the power and the field of the driving equipment. In addition, the rotating mechanism at the center of the swivel is complex and troublesome to set, and the central area of the swivel is occupied by the rotating mechanism, which causes waste of space and affects the use of the swivel.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a carousel or swivel drive arrangement can drive carousel or swivel of arbitrary size, and is lower to performance requirements such as actuating mechanism's power to can save the central zone of swivel.

In order to realize the purpose, the following technical scheme is provided:

a turntable or swivel drive comprises a centering wheel train, a first support wheel train and at least one adjustable drive;

the first support train comprises a plurality of first support wheels configured to roll in abutment with a lower end face of the turntable or swivel or an extension thereof;

the centering train comprises a plurality of centering wheels configured to roll in abutment with a side surface of the turntable or swivel or an extension thereof to center the turntable or swivel;

the adjustable driving device comprises a driving mechanism, a first driving wheel and an elastic pressing assembly, wherein a shell of the driving mechanism is rotatable, an output end of the driving mechanism is in transmission connection with the first driving wheel, the first driving wheel is configured to be in rolling butt joint with an upper end face, a lower end face and/or a side face of the turntable or the rotating ring or an extending body of the turntable or the rotating ring to drive the turntable or the rotating ring to rotate, and the elastic pressing assembly is connected with the shell of the driving mechanism and drives the first driving wheel to be in butt joint with the turntable or the rotating ring all the time.

Further, still include the second and support the train, the second supports the train and includes a plurality of second supporting wheels, and is a plurality of the second supporting wheel with the up end of carousel or swivel or its extension body rolls the butt.

Furthermore, the plurality of centering wheels, the plurality of first supporting wheels and the plurality of second supporting wheels are circumferentially distributed by taking the center of the rotating disc or the rotating ring as a circle center.

Furthermore, the centering wheel train further comprises a rack, the centering wheel train further comprises a plurality of centering seats, each centering wheel is connected with the rack through one centering seat, and the centering seats are connected with the rack through bolts; first supporting wheel train still includes a plurality of first supporting seats, every first supporting wheel is respectively through one first supporting seat with the frame links to each other, first supporting seat with frame bolted connection.

Furthermore, a first tooth structure is arranged on the first driving wheel, and a second tooth structure corresponding to the first tooth structure is arranged on the rotary disc or the rotary ring.

Furthermore, a groove is formed in the first driving wheel, and a flange corresponding to the groove is arranged on the rotary disc or the rotary ring.

Further, the first driving wheel is in rolling contact with the upper end face or the lower end face of the rotary disc or the rotary ring or the extension body of the rotary disc or the rotary ring, the first driving wheel is conical, and a bus of the first driving wheel is overlapped with the radial direction of the rotary disc or the rotary ring.

Furthermore, the adjustable driving device further comprises a second driving wheel and a first driven wheel, wherein the second driving wheel, the first driven wheel and the first driving wheel are respectively in rolling contact with the same surface or different surfaces of the rotary disc or the rotary ring.

Further, the first drive wheel and/or the second drive wheel are made of polyurethane.

Further, the elastic pressing component is a spring.

Compared with the prior art, the utility model provides a carousel or swivel drive arrangement has following beneficial effect:

(1) the rotating mechanism is not required to be arranged at the center of the rotary disc or the rotary ring, the first driving wheel and the upper end face, the lower end face or the side face of the rotary disc or the rotary ring or the extending body of the rotary disc or the side face of the rotary ring are in rolling friction to drive the rotary disc or the rotary ring to rotate, so that the rotary disc or the rotary ring with any size can be driven, the central area of the rotary ring can be fully utilized, the driving mechanism is arranged flexibly, the driving mechanism does not need to be arranged at the center of the rotary disc or the rotary ring, a plurality of driving mechanisms can be arranged along the circumferential direction of the rotary disc or the rotary ring, each driving mechanism only needs small power, and the.

(2) In the rotating process of the rotating disc or the rotating ring, the first supporting wheel is in rolling and abutting connection with the lower end face of the rotating disc or the rotating ring or an extending body of the rotating disc or the rotating ring so as to stably support the rotating disc or the rotating ring and ensure the smooth rotation of the rotating disc or the rotating ring; the centering wheel is in rolling contact with the side surface of the rotary table or the rotary ring (namely the outer peripheral vertical surface of the rotary table and the inner peripheral vertical surface and/or the outer peripheral vertical surface of the rotary table) so as to center the rotary table or the rotary ring and ensure the stable rotation of the rotary table or the rotary ring.

(3) The elasticity compresses tightly the subassembly and links to each other with actuating mechanism and frame respectively, utilizes the elastic force that the elasticity compressed tightly the subassembly, makes the first drive wheel that links to each other with actuating mechanism effectively butt with the swivel all the time, prevents that first drive wheel from leading to the friction drive power of first drive wheel to the swivel because of reasons such as wearing and tearing not enough.

Drawings

Fig. 1 is a schematic structural diagram of a turntable or swivel driving device according to an embodiment of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

FIG. 3 is an enlarged view of a portion of FIG. 1 at B;

fig. 4 is a schematic view illustrating a connection between a driving mechanism and an articulated mechanism according to an embodiment of the present invention;

fig. 5 is a top view of a turntable or swivel drive apparatus provided in an embodiment of the present invention;

fig. 6 is a partially enlarged view of C in fig. 5.

Reference numerals:

1-a frame; 11-upright post; 12-a transverse column;

2-a centering wheel; 3-a first support wheel;

4-a drive mechanism; 5-a first drive wheel; 6-elastic compression assembly;

7-a hinge mechanism; 71-a hinged seat; 72-an articulated shaft; 73-hinged rack;

8-centering seat; 9-a first support; 10-fixing columns;

100-rotation.

Detailed Description

In order to make the technical problems, technical solutions adopted and technical effects achieved by the present invention clearer, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments, not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by the skilled in the art without creative work belong to the protection scope of the present invention.

The present embodiment provides a turntable or swivel driving apparatus capable of driving turntables or swivels of different diameters without providing a rotating mechanism at the center of the turntable or swivel. The present embodiment is explained by taking a swivel as an example.

As shown in fig. 1-3, the turntable or swivel drive may optionally include a frame 1, and a centering wheel train, a first support wheel train, a second support wheel train (not shown), and an adjustable drive mounted to the frame 1.

Referring to fig. 1 and 2, the housing 1 is generally circular to accommodate the shape of the turntable or swivel 100. The centering train comprises a plurality of centering wheels 2. A plurality of centering wheels 2 are distributed in the circumferential direction of the frame 1. Each centering wheel 2 is arranged horizontally and can rotate around its own axis. The first support train comprises a plurality of first support wheels 3. The first supporting wheels 3 are also distributed in the circumferential direction of the frame 1, and each first supporting wheel 3 is vertically arranged and can rotate around the axis of the first supporting wheel 3.

Referring to fig. 1 and 3, the adjustable drive means may optionally comprise a drive mechanism 4 and a first drive wheel 5. The drive mechanism 4 is preferably an electric motor. The first driving wheel 5 is in transmission connection with the output end of the driving mechanism 4 through a speed reducer. In other embodiments, no speed reducer or other means such as chain or belt transmission may be provided between the first driving wheel 5 and the output end of the driving mechanism 4. The driving mechanism 4 is arranged on the frame 1, and the first driving wheel 5 is horizontally arranged and is positioned on the same circumference with the centering wheel 2.

The swivel 100 is placed on the frame 1. Referring to fig. 2, specifically, the lower end surface of the swivel 100 is placed on the first support wheel 3 while each centering wheel 2 abuts against the inner peripheral elevation of the swivel 100. The first drive wheel 5 of the adjustable drive also abuts the inner peripheral elevation of the swivel 100 (see fig. 3). The first driving wheel 5 is rotated by the driving mechanism 4, and further, the swivel 100 is driven to rotate by friction. During rotation of the swivel 100, the first support wheel 3 and the positioning wheel are both in rolling contact with the swivel 100. The first support wheel 3 supports the swivel 100, and ensures smooth rotation of the swivel 100. The centers of all the centering wheels 2 coincide with the center of the frame 1 and the center of the rotating ring 100 to center the rotating ring 100, so as to ensure that the rotating ring 100 rotates stably.

It should be noted that the centering wheel 2 and/or the first supporting wheel 3 may also be directly disposed on the turntable or the rotating ring 100, and at this time, the frame 1 may not be disposed, and the adjustable driving device may be independently mounted on a fixed support, as long as it is ensured that the centering wheel 2 and the first supporting wheel 3 roll and rub against the turntable or the rotating ring 100 and the first driving wheel 5 always rolls and abuts against the turntable or the rotating ring 100, so that the overall structure is simpler and the transmission is stable. Referring again to fig. 1, the frame 1 is frame-shaped and includes a plurality of vertical columns 11 and a plurality of horizontal columns 12. A plurality of uprights 11 are circumferentially distributed so as to define the radial dimension of the frame 1. Preferably, the upright posts 11 are uniformly distributed along the circumference, which facilitates the arrangement and improves the stability of the frame 1. In this embodiment, 12 columns 11 are provided. The adjacent upright posts 11 are connected by cross posts 12 to form an integral framework of the frame 1. The spreader 12 can be selectively provided with two rows, the upper row of spreaders 12 is connected with the upper end of the upright post 11, and the lower row of spreaders 12 is connected with the lower part of the upright post 11, so as to ensure the strength and stability of the whole frame 1. Optionally, a structure such as a triangular leg (not shown) may be provided at the bottom of some or all of the columns 11 to further improve the stability and load-bearing capacity of the frame 1.

In the present embodiment, the centering wheels 2 are provided in 12 numbers. Each centering wheel 2 is mounted on one upright 11 and is arranged inside the upright 11. In particular, the centring wheel 2 is connected to the upright 11 by means of the centring seat 8. The centering seat 8 and the upright post 11 can be selectively connected by bolts. The position of the centering wheel 2 can be finely adjusted by screwing the adjusting bolt, so that the centering wheel 2 is in close contact with the inner peripheral vertical surface of the rotating ring 100, and the centering effect is good. It should be noted that the centering wheel 2 adjacent to the drive mechanism 4 is not shown in the figure. In other embodiments, the centering seat 8 can also be directly fixed on the frame 1 by welding or riveting, and the like, so that the processing is convenient and the connection is firm.

Optionally, there are also 12 first support wheels 3. Each first support wheel 3 is mounted on a cross-post 12 at the upper end of one upright 11. In particular, the first support wheel 3 is connected to the crosspiece 12 by means of the first support seat 9. The first support 9 and the cross-post 12 are optionally bolted together. By screwing the adjusting bolt, the position of the first supporting wheel 3 can be finely adjusted, so that all the first supporting wheels 3 are ensured to be on the same horizontal plane, and the rotating ring 100 is stably supported. It should be noted that the first support wheel 3 adjacent to the drive mechanism 4 is not shown in the figure. In other embodiments, the first supporting seat 9 may also be directly fixed on the frame 1 by welding or riveting, which is convenient to process and firm in connection.

Further, the adjustable driving device is mounted inside the frame 1. Referring to fig. 3 and 4, the housing of the driving mechanism 4 is hinged to the frame 1 by a hinge mechanism 7, and the driving mechanism 4 can rotate relative to the frame 1. Specifically, the hinge mechanism 7 may selectively include a hinge seat 71, a hinge bracket 73, and a hinge shaft 72. The hinge seat 71 is fixed on the cross column 12 of the frame 1 through the fixing column 10, the hinge shaft 72 is rotatably mounted on the hinge seat 71, the hinge frame 73 is fixedly connected with the hinge shaft 72 and the output end of the driving mechanism 4 respectively, and the driving mechanism 4 and the hinge frame 73 can rotate around the hinge shaft 72.

Optionally, referring to fig. 5 and 6, the adjustable drive means further comprises a resilient compression assembly 6. The resilient hold-down assembly 6 is preferably a spring. The both ends that the elasticity compresses tightly subassembly 6 are connected with articulated frame 73 and spreader 12 respectively to make actuating mechanism 4 elasticity articulate in frame 1, and then make first drive wheel 5 all the time with effective butt of swivel 100 and keep certain butt power all the time, prevent that first drive wheel 5 from leading to first drive wheel 5 not enough to the friction drive power of swivel 100 because of reasons such as wearing and tearing.

Optionally, in other embodiments, the housing of the driving mechanism 4 may be in sliding contact with the frame 1 through a linear sliding mechanism, the driving mechanism 4 may be capable of sliding relative to the frame 1, so that the driving mechanism 4 is far away from or close to the turntable or the rotary ring 100, and the first driving wheel 5 is always in effective contact with the turntable or the rotary ring 100 through an elastic member and always keeps a certain contact force, thereby preventing the first driving wheel 5 from causing insufficient friction driving force on the rotary ring 100 due to wear and the like.

Preferably, the first driving wheel 5 is provided with a groove structure (not shown), and the turntable or the rotating ring 100 is provided with a flange (not shown). Through the cooperation of the groove and the flange, the friction area and the transmission stability are improved. For example, the first driving wheel 5 is a pulley, and the turntable or the rotary ring 100 is provided with a V-belt.

The first driving wheel 5 may further be provided with a first tooth structure (not shown), and the turntable or the rotary ring 100 is provided with a second tooth structure (not shown) corresponding to the first tooth structure, so as to improve the friction area and the transmission stability. At this time, the first driving wheel 5 is a toothed wheel, and a chain or a synchronous toothed belt is arranged on the turntable or the rotary ring 100.

It should be noted that the adjustable driving device may be disposed outside the frame 1, and the first driving wheel 5 frictionally drives the outer peripheral vertical surface of the rotating ring 100. In addition, the first driving wheel 5 may also rub against the upper end surface or the lower end surface of the swivel 100 to realize driving. The adjustable drive means may optionally also include a second drive wheel and/or a first driven wheel. The second driving wheel and the first driving wheel 5 are both driving wheels, and the first driven wheel is a driven wheel. Further, the first drive wheel 5 and the second drive wheel may be simultaneously friction driven against the same face of the swivel 100. The first drive wheel 5 and the first drive wheel may frictionally drive different faces of the swivel 100, such as both up and down or left and back gripping the swivel 100. The arrangement of the first drive wheel 5, the second drive wheel and/or the first driven wheel can be adapted to the specific situation. The adjustable driving device can also be provided with a third driving wheel, a fourth driving wheel and the like, and can also be provided with a second driven wheel, a third driven wheel and the like. The adjustable driving devices can be arranged on the machine frame 1, and the adjustable driving devices can simultaneously drive the rotating ring 100 to rotate, so that the requirements on the performance of the driving mechanism 4, such as power and the like, can be met, and the cost is reduced.

Due to the different linear velocities at the points in the radial direction on the swivel 100 or turntable, the first drive wheel 5 and/or the second drive wheel is preferably conical when the first drive wheel 5 and/or the second drive wheel is frictionally driven with the upper end surface and/or the lower end surface of the swivel 100 or turntable. The first and second conical drive wheels 5 and 5 are both rotated about their own central axes, and the linear velocities at points on the generatrix of the first and second drive wheels 5 and 5 are also different. By arranging the generatrix on the first drive wheel 5 and/or the second drive wheel in radial coincidence with the swivel 100 or the turntable, linear velocities at different radius points can be accommodated.

Further, the centering wheel 2 in the centering wheel train may also be disposed on the outer circumference of the frame 1, i.e., the centering wheel 2 is in rolling contact with the outer side surface (i.e., outer circumference vertical surface) of the rotating ring 100. It is also possible to provide centering wheels 2 on both the inner and outer circumferences of the frame 1 while centering the swivel 100 from both the inner and outer sides of the swivel 100.

A second support train (not shown) may be provided to ensure rotational stability of the swivel 100. The second support wheel system comprises a plurality of second support wheels, which are connected to the frame 1 via second support seats and located above the swivel 100. The first supporting wheel 3 and the second supporting wheel vertically clamp the rotating ring 100, and the rotating stability of the rotating ring 100 is further improved.

When the driven object is a turntable, the arrangement modes of the centering wheel train, the first supporting wheel train, the second supporting wheel train and the adjustable driving device are slightly adjusted. Specifically, the centering wheel 2 can only be arranged on the peripheral vertical surface of the turntable; the first driving wheel 5 and the second driving wheel can be arranged on the peripheral vertical surface, the upper end surface and/or the lower end surface of the turntable; the first support wheel 3 and the second support wheel may be arranged on the upper end face and/or the lower end face of the turntable.

It should be noted that the acting surfaces of the centering wheel 2, the first supporting wheel 3, the second supporting wheel, the first driving wheel 5 and the second driving wheel and the rotating disc or the rotating ring 100 are not limited to the upper end surface, the lower end surface, the inner circumference vertical surface and the outer circumference vertical surface, but also include an extension body of the upper end surface, the lower end surface, the inner circumference vertical surface and the outer circumference vertical surface, so that the rotating disc or the rotating ring 100 can adapt to various working conditions.

It should be noted that the centering wheel 2, the first supporting wheel 3, the second supporting wheel, the first driving wheel 5 and the second driving wheel may vertically roll and abut against the rotating disc or the rotating ring 100, or may roll and abut against the rotating disc or the rotating ring 100 at an included angle, as long as the functions of supporting, centering and/or driving are provided.

In order to reduce the transmission noise, the centering wheel 2, the first supporting wheel 3, the second supporting wheel, the first driving wheel 5 and/or the second driving wheel can be selectively made of polyurethane, so that the purposes of shock absorption and noise reduction are achieved while the strength and the rigidity are ensured. In other embodiments, the first driving wheel 5 and/or the second driving wheel may be made of hard plastic or metal with certain strength.

The working steps of the turntable or swivel driving device are roughly as follows: the driving mechanism 4 is electrified, the driving mechanism 4 drives the first driving wheel 5 to rotate, and the first driving wheel 5 always makes rolling friction with the side surface of the turntable or the rotary ring 100 under the elastic action of the elastic pressing component 6, so that the turntable or the rotary ring 100 is driven to rotate. During rotation of the turntable or swivel 100, the centering wheel 2 and the first support wheel 3 are in rolling contact with the turntable or swivel 100 and center and support the turntable or swivel 100.

In this embodiment, a rotation mechanism is not required to be disposed at the center of the turntable or the swivel 100, and the entire turntable or the swivel 100 is driven to rotate by driving the rotation mechanism, so that the central area of the swivel 100 can be fully utilized. For example, the swivel 100 can be used as a conveying platform to simultaneously operate on the inner side and the outer side of the swivel 100, thereby improving the production efficiency. A civil pillar can also be arranged in the center of the swivel 100 to make full use of space. Furthermore, as a central rotating mechanism is not required to be arranged, only the first driving wheel 5 and/or the second driving wheel are/is arranged on the circumferential direction, the upper end face or the lower end face of the rotary table or the rotary ring 100, and the centering wheel 2 is arranged on the circumferential direction of the rotary table or the rotary ring 100, the requirements on the driving mechanism 4, the site conditions and the like are low, the rotary table or the rotary ring 100 with any size can be driven, and the driving mechanism 4 is flexible in arrangement, strong in adaptability, simple in structure and low in cost. Compared with the existing rotating mechanism for driving the center of the turntable or the rotating ring 100, the embodiment is driven by friction along the circumferential direction of the turntable or the rotating ring 100, the speed ratio of the speed reducer is smaller, and therefore the cost of the speed reducer of the driving mechanism 4 is reduced.

It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.

Claims (10)

1. A turntable or swivel drive comprises a centering wheel train, a first support wheel train and at least one adjustable drive;

the first support train comprises a plurality of first support wheels (3), the plurality of first support wheels (3) being configured to be in rolling abutment with a lower end face of the turntable or swivel (100) or an extension thereof;

-the centering train comprises a plurality of centering wheels (2), the plurality of centering wheels (2) being configured to be in rolling abutment with a side face of the turntable or swivel (100) or an extension thereof, to center the turntable or swivel (100);

adjustable drive arrangement includes actuating mechanism (4), first drive wheel (5) and elasticity compress tightly subassembly (6), the casing of actuating mechanism (4) is rotatable, the output of actuating mechanism (4) with first drive wheel (5) transmission links to each other, first drive wheel (5) be configured into with carousel or swivel (100) or the up end of its extension body, terminal surface and/or side roll butt down, in order to drive carousel or swivel (100) are rotatory, elasticity compresses tightly subassembly (6) and connects the casing of actuating mechanism (4) and drive first drive wheel (5) all the time with carousel or swivel (100) butt.

2. A turntable or swivel drive arrangement according to claim 1, further comprising a second support train comprising a plurality of second support wheels in rolling abutment with the upper end face of the turntable or swivel (100) or an extension thereof.

3. A turntable or swivel drive arrangement according to claim 2, characterized in that a plurality of said centering wheels (2), a plurality of said first support wheels (3) and a plurality of said second support wheels are all circumferentially distributed around the center of said turntable or swivel (100).

4. A turntable or swivel drive according to claim 1, further comprising a frame (1), wherein said centering train further comprises a plurality of centering seats (8), each of said centering wheels (2) being connected to said frame (1) by one of said centering seats (8), said centering seats (8) being bolted to said frame (1); first supporting wheel train still includes a plurality of first supporting seat (9), every first supporting wheel (3) are respectively through one first supporting seat (9) with frame (1) links to each other, first supporting seat (9) with frame (1) bolted connection.

5. A turntable or swivel drive arrangement according to claim 1, characterized in that the first drive wheel (5) is provided with a first tooth structure and the turntable or swivel (100) is provided with a second tooth structure corresponding to the first tooth structure.

6. A turntable or swivel drive arrangement according to claim 1, characterized in that the first drive wheel (5) is provided with a groove and the turntable or swivel (100) is provided with a flange corresponding to the groove.

7. A turntable or swivel drive arrangement according to claim 1, characterized in that the first driving wheel (5) is in rolling contact with the upper or lower end surface of the turntable or swivel (100) or an extension thereof, the first driving wheel (5) being cone-shaped, the generatrix of the first driving wheel (5) coinciding with the radial direction of the turntable or swivel (100).

8. A turntable or swivel drive arrangement as claimed in claim 1, wherein the adjustable drive arrangement further comprises a second drive wheel and a first driven wheel, the second drive wheel, the first driven wheel and the first drive wheel (5) being in rolling abutment with the same or different faces of the turntable or swivel (100), respectively.

9. A turntable or swivel drive arrangement according to claim 8, characterized in that the first drive wheel (5) and/or the second drive wheel is made of polyurethane.

10. A turntable or swivel drive as claimed in claim 1, characterized in that the resilient hold-down assembly (6) is a spring.

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