A friction wheel drive turntable device with pre-pressure adaptive adjustment

Abstract

This invention relates to a friction wheel driven turntable device with adaptive preload adjustment, comprising a power unit, a friction drive unit, and a preload adjustment unit. This device incorporates a stepper motor to adjust the preload, which can determine whether slippage has occurred based on real-time feedback from a displacement measurement unit regarding friction wheel speed fluctuations, thereby automatically adjusting the system preload to ensure transmission stability. This invention features high transmission accuracy, the ability to drive large loads, automatic preload adjustment, effective prevention of friction wheel slippage, and high reliability. It is suitable for low-speed, high-load, and high-transmission-accuracy rotary shaft drive applications.

Description

Technical Field

[0001] This invention relates to the field of turntable equipment technology, and more specifically to a friction wheel driven turntable device with pre-pressure adaptive adjustment. Background Technology

[0002] High-precision one-dimensional turntables are used for optical inspection. Currently, most large one-dimensional turntables are driven by built-in brushless torque motors, which have the characteristics of compact structure and ability to drive large loads. However, high-precision one-dimensional turntables on the market often experience slippage between the active friction wheel and the driven friction wheel, making it difficult to achieve precise control of the contact preload. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defects in the prior art, thereby providing a rotary table device driven by a friction wheel with pre-pressure adaptive adjustment.

[0004] A friction wheel drive turntable device with adaptive preload adjustment includes a power unit, a friction drive unit, and a preload adjustment unit.

[0005] The preload adjustment unit includes an adapter, a spring plate, a spring guide rod, a spring, a nut bracket, a first linear guide rail, a second linear guide rail, a nut, a stepper motor, a stepper motor support frame, and a main support frame. The bottom of the friction drive unit is connected to the slider of the second linear guide rail. The output end of the power unit is connected to the friction drive unit. A displacement measuring unit is located below the power unit. Both ends of the adapter are connected to the friction drive unit and the spring plate, respectively. Both ends of the spring guide rod are connected to the spring plate and the nut bracket, respectively. A spring is fitted on the spring guide rod. A nut is installed on the nut bracket. The lead screw output shaft of the stepper motor is connected to the nut. The bottom of the nut bracket is connected to the slider of the first linear guide rail. Both the first and second linear guide rails are installed on the upper surface of the main support frame. The stepper motor is installed on the upper surface of the main support frame through the stepper motor support frame.

[0006] Furthermore, the friction drive unit includes an active friction wheel, a first bearing, a driven friction wheel, a first threaded pressure ring, a bearing end cover, and a friction wheel bearing housing;

[0007] The bottom of the friction wheel bearing housing is connected to the slider of the second linear guide rail, and the side of the friction wheel bearing housing is connected to the adapter. A first bearing is installed inside the friction wheel bearing housing. The inner ring of the first bearing is connected to the first threaded pressure ring. The first threaded pressure ring is threadedly connected to the active friction wheel. The active friction wheel and the driven friction wheel form a friction pair. The bearing end cover is connected to the outer ring of the first bearing on the side away from the working surface of the active friction wheel, and the bearing end cover is also connected to the friction wheel bearing housing. The shaft of the active friction wheel extends out of the bearing end cover and is connected to the power unit.

[0008] Furthermore, the power unit includes a flexible coupling, a motor bearing housing pressure plate, a motor bearing housing, a motor stator, a motor rotor, a second threaded pressure ring, a second bearing, a motor shaft, a bearing pressure ring, and a motor bearing housing end cover; the displacement measurement unit includes a grating ruler, a grating ruler reading head, and a grating ruler reading head support frame.

[0009] The motor bearing housing is located on the lower surface of the main support frame. A second bearing is housed inside the motor bearing housing. The inner ring of the second bearing is connected to a second threaded pressure ring, which is threadedly connected to the motor shaft. The motor stator is located inside the motor bearing housing and above the second bearing. The motor rotor is located within the inner ring of the motor stator, and the middle section of the motor shaft is fixedly connected to the motor rotor. One end of the motor shaft is connected to an elastic coupling, and the other end of the elastic coupling is connected to the shaft of the driving friction wheel. The outer ring of the second bearing, on the side away from the motor stator, is connected to a bearing pressure ring, which is connected to the motor bearing housing. The motor bearing housing pressure plate is connected to the upper surface of the main support frame, pressing the motor stator. A grating ruler reading head support frame is fixed to the motor bearing housing, and a grating ruler reading head is connected to the grating ruler reading head support frame. The grating ruler is fixed to the motor shaft via a connection. The motor bearing housing end cover is connected to the lower end of the motor bearing housing.

[0010] Furthermore, the pre-pressure adjustment unit also includes a pressure sensor, the two ends of which are connected to the adapter and the spring pressure plate, respectively.

[0011] Furthermore, both ends of the first linear guide rail are provided with first guide rail blocks, and both ends of the second linear guide rail are provided with second guide rail blocks.

[0012] Furthermore, the friction wheel bearing housing is provided with a pair of first bearings, a first bearing spacer is provided between the two first bearings, the inner rings of the two first bearings are connected to the first threaded pressure ring, and the bearing end cover is connected to the outer ring of the first bearing located below.

[0013] The motor bearing housing contains a pair of second bearings, with a second bearing spacer between the two second bearings. The inner rings of the two second bearings are connected to a second threaded pressure ring, and the bearing pressure ring is connected to the outer ring of the second bearing located below.

[0014] Furthermore, the spring guide rods are arranged in pairs between the spring pressure plate and the nut bracket.

[0015] Furthermore, the first linear guide rail and the second linear guide rail are both arranged in pairs on the upper surface of the main support frame.

[0016] Furthermore, the driven friction wheel is fixed on the turntable surface, the turntable surface is connected to the upper surface of the turntable base, and the motor bearing housing is connected to the side of the turntable base.

[0017] Furthermore, a gasket is provided between the motor bearing housing and the turntable base.

[0018] The technical solution of this invention has the following advantages:

[0019] 1. This invention includes a preload adjustment unit. First, the control system compares the rotational speed information provided by the displacement measurement unit to determine whether there is a sudden change, thereby determining whether slippage occurs between the driving wheel and the driven wheel. If slippage occurs, the lead screw output shaft of the stepper motor drives the nut to make a slight displacement along the linear guide rail, and transmits the output force to the friction pair through mechanisms such as springs, spring pressure plates, and friction wheel bearing seats, thereby achieving real-time and precise control of the contact preload and effectively preventing slippage between the driving friction wheel and the driven friction wheel.

[0020] 2. The present invention is equipped with a pressure sensor, which can monitor the change of pre-pressure between the active friction wheel and the driven friction wheel in real time, and has guiding significance for system stability control and friction pair material design.

[0021] 3. In this invention, the first bearing, the second bearing, the first guide rail, the second guide rail, the first bearing, the second bearing, and the spring guide rod are all arranged in pairs, which greatly improves the stability of force transmission in this device. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a cross-sectional view of the present invention;

[0024] Figure 2 Axonometric drawing of the invention;

[0025] Figure 3 This is a schematic diagram showing the contact and distribution of the driving and driven friction wheels in this invention;

[0026] Figure 4 This is a schematic diagram showing the distribution of the turntable base, platform, and driven friction wheel in this invention;

[0027] Figure 5 This is a schematic diagram of the overall structural layout of the present invention.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1-Active friction wheel; 2-First bearing; 3-First bearing spacer;

[0030] 4-First threaded retaining ring; 5-Bearing end cap; 6-Friction wheel bearing housing;

[0031] 7-Adapter; 8-Pressure sensor; 9-Spring pressure plate;

[0032] 10-Spring guide rod; 11-Spring; 12-Nut bracket;

[0033] 13-Nut; 14-Stepper motor; 15-Stepper motor support frame;

[0034] 16-First guide rail stop; 17-First linear guide rail; 18-Second guide rail stop;

[0035] 19-Second linear guide; 20-Flexible coupling; 21-Main support frame;

[0036] 22-Motor bearing housing pressure plate; 23-Motor bearing housing; 24-Motor stator;

[0037] 25-Motor rotor; 26-Second threaded pressure ring; 27-Second bearing;

[0038] 28-Second bearing spacer; 29-Bearing retaining ring; 30-Raster ruler reading head support frame;

[0039] 31-Reading head of the grating ruler; 32-Gramming ruler; 33-Motor bearing housing end cover;

[0040] 34-Motor shaft; 35-Shim; 36-Turntable base;

[0041] 37 - Driven friction wheel; 38 - Turntable surface. Detailed Implementation

[0042] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0044] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0045] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0046] Please see Figure 1 and Figure 2 A friction wheel drive turntable device with adaptive pre-pressure adjustment includes a power unit, a friction drive unit, and a pre-pressure adjustment unit.

[0047] The preload adjustment unit includes an adapter 7, a spring pressure plate 9, a spring guide rod 10, a spring 11, a nut bracket 12, a first linear guide rail 17, a second linear guide rail 19, a nut 13, a stepper motor 14, a stepper motor support frame 15, and a main load-bearing frame 21. The bottom of the friction drive unit is connected to the slider of the second linear guide rail 19, and the output end of the power unit is connected to the friction drive unit. A displacement measuring unit is provided below the power unit. The two ends of the adapter 7 are connected to the friction drive unit and the spring respectively by screws. The pressure plate 9 is connected, and the two ends of the spring guide rod 10 are connected to the spring pressure plate 9 and the nut bracket 12 respectively. A spring 11 is sleeved on the spring guide rod 10, and a nut 13 is installed on the nut bracket 12. The lead screw output shaft of the stepper motor 14 is connected to the nut 13. The bottom of the nut bracket 12 is connected to the slider of the first linear guide rail 17. The first linear guide rail 17 and the second linear guide rail 19 are both installed on the upper surface of the main support frame 21. The stepper motor 14 is installed on the upper surface of the main support frame 21 through the stepper motor support frame 15.

[0048] In this embodiment, the friction drive unit includes an active friction wheel 1, a first bearing 2, a driven friction wheel 37, a first threaded pressure ring 4, a bearing end cover 5, and a friction wheel bearing seat 6;

[0049] The bottom of the friction wheel bearing seat 6 is connected to the slider of the second linear guide rail 19 to prevent the friction wheel bearing seat 6 from moving tangentially and axially, which is beneficial to improving the preload adjustment accuracy. The side of the friction wheel bearing seat 6 is connected to the adapter 7. The friction wheel bearing seat 6 is equipped with a first bearing 2. The inner ring of the first bearing 2 is connected to the first threaded pressure ring 4. The first threaded pressure ring 4 is threadedly connected to the active friction wheel 1. The active friction wheel 1 and the driven friction wheel 37 form a friction pair. The bearing end cover 5 is connected to the outer ring of the first bearing 2 on the side away from the working surface of the active friction wheel 1, and the bearing end cover 5 is also connected to the friction wheel bearing seat 6. The shaft of the active friction wheel 1 extends out of the bearing end cover 5 and is connected to the power unit.

[0050] In this embodiment, the power unit includes a flexible coupling 20, a motor bearing seat pressure plate 22, a motor bearing seat 23, a motor stator 24, a motor rotor 25, a second threaded pressure ring 26, a second bearing 27, a motor shaft 34, a bearing pressure ring 29, and a motor bearing seat end cover 33; the displacement measuring unit includes a grating ruler 32, a grating ruler reading head 31, and a grating ruler reading head support frame 30.

[0051] The motor bearing housing 23 is located on the lower surface of the main support frame 21. A second bearing 27 is housed inside the motor bearing housing 23. The inner ring of the second bearing 27 is connected to a second threaded pressure ring 26, which is threadedly connected to the motor shaft 34. The motor stator 24 is bonded to the inner cavity of the motor bearing housing 23 by applying epoxy adhesive to its cylindrical surface and is positioned above the second bearing 27. The motor rotor 25 is fitted with the inner ring of the motor stator 24, and the middle section of the motor shaft 34 is fixed to the motor rotor 25 with screws. One end of the motor shaft 34 is connected to the flexible coupling 20, and the other end of the flexible coupling 20 is connected to the shaft of the active friction wheel 1. The outer ring of the second bearing 27, on the side away from the motor stator 24, is connected to a bearing pressure ring 29, which is connected to the motor bearing housing 23 with screws, thereby adjusting the preload of the second bearing 27. The motor bearing housing pressure plate 22 is connected to the upper surface of the main support frame 21 and presses the motor stator 24. The grating ruler reading head support frame 30 is fixed to the motor bearing housing 23 by screws. The grating ruler reading head 31 is connected to the grating ruler reading head support frame 30. The grating ruler 32 is fixed to the motor shaft 34 by connection. The grating ruler reading head support frame 30, the grating ruler reading head 31, and the grating ruler 32 constitute the displacement measurement unit of the device, which is used to output information such as the rotational speed and displacement of the motor shaft 34, and assist the control system in judging whether the friction pair has slipped. The motor bearing housing end cover 33 is connected to the lower end of the motor bearing housing 23 by screws. It mainly serves a sealing function to prevent dust, debris, etc. from entering the cavity of the motor bearing housing 23 and affecting the reliability of the system.

[0052] In this embodiment, the pre-pressure adjustment unit also includes a pressure sensor 8. The two ends of the pressure sensor are connected to the adapter 7 and the spring pressure plate 9 respectively by screws. The pressure sensor 8 can monitor the change of pre-pressure between the active friction wheel 1 and the driven friction wheel 37 in real time, which is of guiding significance for system stability control and friction pair material design.

[0053] In this embodiment, both ends of the first linear guide rail 17 are provided with first guide rail blocks 16, and both ends of the second linear guide rail 19 are provided with second guide rail blocks 18. By setting the blocks, the sliders on the first guide rail blocks 16 and the second linear guide rail 19 can be mechanically limited to prevent the slider displacement from exceeding the range.

[0054] In this embodiment, a pair of first bearings 2 installed "face to face" are provided inside the friction wheel bearing housing 6, a first bearing spacer 3 is provided between the two first bearings 2, the inner rings of the two first bearings 2 are connected to the first threaded pressure ring 4, and the bearing end cover 5 is connected to the outer ring of the first bearing 2 located below.

[0055] The motor bearing housing 23 contains a pair of second bearings 27 mounted face-to-face. A second bearing spacer 28 is provided between the two second bearings 27. The inner rings of the two second bearings 27 are connected to a second threaded pressure ring 26, and the bearing pressure ring 29 is connected to the outer ring of the second bearing 27 located below. By setting up a pair of first bearings 2 and second bearings 27, the rotation process is made smoother. At the same time, by setting a bearing spacer between each pair of bearings, the accuracy can be further improved.

[0056] In this embodiment, both the first bearing 2 and the second bearing 27 are angular contact ball bearings. Angular contact ball bearings can withstand radial and axial loads simultaneously and can operate at high speeds, which is very suitable for this application scenario.

[0057] In this embodiment, the spring guide rods 10 are arranged in pairs between the spring pressure plate 9 and the nut bracket 12. Each of the two spring guide rods 10 is fitted with a spring 11. The pair arrangement makes the entire movement process more stable. In this embodiment, the spring 11 is a rectangular helical spring. The rectangular helical spring uses square wire, which has better strength and fatigue resistance, and can reduce the risk to users caused by using inferior springs to a certain extent.

[0058] In this embodiment, the first linear guide rail 17 and the second linear guide rail 19 are both arranged in pairs on the upper surface of the main support frame 21. The pair arrangement of the first linear guide rail 17 and the second linear guide rail 19 can make the movement of the device installed on the guide rail more stable.

[0059] Please see Figures 3 to 5The driven friction wheel 37 is fixed on the turntable surface 38, which is connected to the upper surface of the turntable base 36. The motor bearing seat 23 is connected to the side of the turntable base 36. The three sets of pre-pressure adaptive adjustment friction wheel drive turntable devices (A, B and C in the figure) are evenly arranged around the turntable at a 120° interval in the horizontal direction. On the one hand, this can counteract the influence of the pre-pressure of the active friction wheel and the driven friction wheel in the normal direction of the contact surface on the turntable main shaft system, reducing the shaking error of the turntable main shaft system. On the other hand, it can multiply the driving capability of the pre-pressure adaptive adjustment friction wheel drive turntable device.

[0060] In this embodiment, a shim 35 is provided between the motor bearing housing 23 and the turntable base 36. In actual use, the installation accuracy of the device can be improved by fine-tuning the shim 35.

[0061] In this embodiment, the motor in the power unit is a brushless DC torque motor, that is, the motor stator 24 and the motor rotor 25 are the stator and rotor of a brushless DC torque motor. The brushless DC torque motor has a series of advantages such as simple structure, reliable operation and convenient maintenance of AC motor, as well as many advantages such as high operating efficiency and good speed regulation performance of DC motor, which is very suitable for the application scenario of this device.

[0062] The working principle of this device is as follows: First, electromagnetic excitation is applied to the stator of the brushless DC torque motor, causing the rotor of the brushless DC torque motor to rotate, which in turn drives the motor shaft 34, which is fixed to it, to rotate. The output force of the motor shaft 34 is transmitted to the active friction wheel 1 in the friction drive unit of the device through the flexible coupling 20. The active friction wheel 1 and the driven friction wheel 37 move against each other through friction. Based on the real-time feedback of the friction wheel speed fluctuation information from the displacement measurement unit of the device, which consists of the grating ruler reading head support frame 30, the grating ruler reading head 31, and the grating ruler 32, the device judges whether slippage has occurred, thereby automatically adjusting the system preload. That is, the stepping amount of the stepper motor 14 is adjusted by the control system, and the output force of the stepper motor 14 is transmitted to the contact interface of the friction pair through the rectangular helical spring, thereby achieving the purpose of adjusting the preload and ensuring the stability of the transmission. This device has the characteristics of high transmission accuracy, ability to drive large loads, automatic adjustment of preload, effective prevention of friction wheel slippage, and high reliability. It is suitable for low-speed, high-load, and high-transmission-accuracy rotary shaft drive applications.

[0063] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A friction wheel-driven turntable device with adaptive preload adjustment, characterized in that, It includes a power unit, a friction drive unit, and a preload adjustment unit; The preload adjustment unit includes a connector (7), a spring plate (9), a spring guide rod (10), a spring (11), a nut bracket (12), a first linear guide rail (17), a second linear guide rail (19), a nut (13), a stepper motor (14), a stepper motor support frame (15), and a main load-bearing frame (21). The bottom of the friction drive unit is connected to the slider of the second linear guide rail (19), the output end of the power unit is connected to the friction drive unit, a displacement measuring unit is provided below the power unit, and the two ends of the connector (7) are connected to the friction drive unit and the spring plate (9) respectively. The two ends of the spring guide rod (10) are connected to the spring pressure plate (9) and the nut bracket (12) respectively. A spring (11) is fitted on the spring guide rod (10), and a nut (13) is installed on the nut bracket (12). The lead screw output shaft of the stepper motor (14) is connected to the nut (13). The bottom of the nut bracket (12) is connected to the slider of the first linear guide rail (17). The first linear guide rail (17) and the second linear guide rail (19) are both installed on the upper surface of the main support frame (21). The stepper motor (14) is installed on the upper surface of the main support frame (21) through the stepper motor support frame (15). The friction drive unit includes an active friction wheel (1), a first bearing (2), a driven friction wheel (37), a first threaded pressure ring (4), a bearing end cover (5), and a friction wheel bearing seat (6). The bottom of the friction wheel bearing seat (6) is connected to the slider of the second linear guide rail (19), the side of the friction wheel bearing seat (6) is connected to the adapter (7), the friction wheel bearing seat (6) is provided with a first bearing (2), the inner ring of the first bearing (2) is connected to the first threaded pressure ring (4), the first threaded pressure ring (4) is threadedly connected to the active friction wheel (1), the active friction wheel (1) and the driven friction wheel (37) form a friction pair, the bearing end cover (5) is connected to the outer ring of the first bearing (2) away from the working surface of the active friction wheel (1), and the bearing end cover (5) is also connected to the friction wheel bearing seat (6), the shaft of the active friction wheel (1) extends out of the bearing end cover (5) and is connected to the power unit; The power unit includes a flexible coupling (20), a motor bearing seat pressure plate (22), a motor bearing seat (23), a motor stator (24), a motor rotor (25), a second threaded pressure ring (26), a second bearing (27), a motor shaft (34), a bearing pressure ring (29), and a motor bearing seat end cover (33); the displacement measurement unit includes a grating ruler (32), a grating ruler reading head (31), and a grating ruler reading head support frame (30); The motor bearing housing (23) is located on the lower surface of the main support frame (21). A second bearing (27) is located inside the motor bearing housing (23). The inner ring of the second bearing (27) is connected to a second threaded pressure ring (26). The second threaded pressure ring (26) is threadedly connected to the motor shaft (34). The motor stator (24) is located inside the motor bearing housing (23) and above the second bearing (27). The motor rotor (25) is located within the inner ring of the motor stator (24), and the middle section of the motor shaft (34) is fixedly connected to the motor rotor (25). The motor shaft (34) is connected to one end of the flexible coupling (20), and the other end of the flexible coupling (20) is connected to the other end of the flexible coupling (20). One end is connected to the shaft of the active friction wheel (1), the outer ring of the second bearing (27) away from the motor stator (24) is connected to the bearing pressure ring (29) and the bearing pressure ring (29) is connected to the motor bearing seat (23), the motor bearing seat pressure plate (22) is connected to the upper surface of the main support frame (21) to press the motor stator (24), the grating ruler reading head support frame (30) is fixed on the motor bearing seat (23), the grating ruler reading head (31) is connected on the grating ruler reading head support frame (30), the grating ruler (32) is fixed on the motor shaft (34) by connection, and the motor bearing seat end cover (33) is connected to the lower end of the motor bearing seat (23).

2. The apparatus according to claim 1, characterized in that, The pre-pressure adjustment unit also includes a pressure sensor (8), with its two ends connected to the adapter (7) and the spring pressure plate (9), respectively.

3. The apparatus according to claim 1, characterized in that, The first linear guide (17) has a first guide block (16) at both ends, and the second linear guide (19) has a second guide block (18) at both ends.

4. The apparatus according to claim 1, characterized in that, The friction wheel bearing housing (6) is provided with a pair of first bearings (2), and a first bearing spacer (3) is provided between the two first bearings (2). The inner rings of the two first bearings (2) are connected to the first threaded pressure ring (4), and the bearing end cover (5) is connected to the outer ring of the first bearing (2) located below. The motor bearing housing (23) is provided with a pair of second bearings (27), and a second bearing spacer (28) is provided between the two second bearings (27). The inner rings of the two second bearings (27) are connected to the second threaded pressure ring (26), and the bearing pressure ring (29) is connected to the outer ring of the second bearing (27) located below.

5. The apparatus according to claim 1, characterized in that, The spring guide rods (10) are arranged in pairs between the spring pressure plate (9) and the nut bracket (12).

6. The apparatus according to claim 1, characterized in that, The first linear guide (17) and the second linear guide (19) are both arranged in pairs on the upper surface of the main support frame (21).

7. The apparatus according to claim 1, characterized in that, The driven friction wheel (37) is fixed on the turntable surface (38), the turntable surface (38) is connected to the upper surface of the turntable base (36), and the motor bearing seat (23) is connected to the side of the turntable base (36).

8. The apparatus according to claim 7, characterized in that, A gasket (35) is provided between the motor bearing housing (23) and the turntable base (36).

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