A back lash detection apparatus for a speed reducer

Abstract

The utility model discloses a kind of reducer back gap detection equipment, including workbench, mobile driving end detection component is provided on the workbench, reducer body is provided on the workbench, the driving end detection component is used to detect the reducer body. In the utility model driving end detection component, the electric push rod in two fixed grooves can drive slider to drive moving plate to slide horizontally along workbench, the interval between two servo motors is flexibly adjusted, different length reducer is adapted, driving lifting assembly is rotated by driving motor to drive threaded rod, so that movable plate promotes top block and base lifting, different height specifications reducer is adapted, rotating adjustment component is rotated by rotating motor to drive annular plate and rotating plate, cooperate the height fine adjustment of driving lifting assembly, the angle and height deviation of reducer input and output shaft and connecting shaft can be accurately corrected.

Description

Technical Field

[0001] This utility model relates to the field of gearbox backlash detection technology, specifically a gearbox backlash detection device. Background Technology

[0002] Backlash, also known as return clearance, is an important testing parameter for speed reducers, especially planetary gear reducers. Excessive backlash can lead to equipment lag, positioning deviations, and even production accidents. Therefore, a backlash detection device is needed.

[0003] According to application number CN202120302086.9, a gear reducer backlash detection device is disclosed, including a worktable, a control unit, an active servo motor, a driven servo motor, a first sensing unit, a second sensing unit, a coupling, a movable base, and a fixed base. The first sensing unit is mounted on the active servo motor; the gear reducer is mounted on the fixed base and connected to the active servo motor; the coupling connects the driven servo motor and the gear reducer; the second sensing unit is mounted on the driven servo motor; both the first and second sensing units are electrically connected to the control unit.

[0004] The speed reducer installation structure of the aforementioned test equipment is mostly a rigid design, only compatible with speed reducer models of specific lengths and heights. When testing speed reducers of different sizes, it is necessary to disassemble and replace special fixtures or adjust the overall structure of the worktable, which is cumbersome and time-consuming. Especially for speed reducers with large length differences, the lack of flexibly adjustable test components makes it difficult to quickly align the active end test shaft with the input and output shafts of the speed reducer, significantly reducing test efficiency. At the same time, the lack of rotation adjustment function means that when there is an angular deviation between the input and output shafts of the speed reducer and the test shaft, the speed reducer must be manually pried to correct it, which is not only difficult to operate but also prone to damaging the speed reducer shaft end due to uneven force. Therefore, we provide a speed reducer backlash testing device. Utility Model Content

[0005] The purpose of this invention is to provide a gearbox backlash detection device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a speed reducer backlash detection device, comprising a worktable, a movable active end detection component disposed on the worktable, a speed reducer body disposed on the worktable, the active end detection component being used to detect the speed reducer body, the movable active end detection component being used to detect speed reducer bodies of different lengths, a drive lifting component disposed on the worktable, the drive lifting component being used to adjust the height of the speed reducer body after installation, and a rotation adjustment component disposed on the worktable, the rotation adjustment component driving the speed reducer body to rotate through the drive lifting component, ensuring that the output shaft and input shaft of the speed reducer body and the detection shaft on the active end detection component are in a concentric state.

[0007] Preferably, the active end detection component includes two fixed slots, each located on the top of the worktable. An electric push rod is installed on the inner wall of the fixed slot, a slider is installed on the output end of the electric push rod, and a movable plate is installed on the top of the slider.

[0008] Preferably, an active servo motor is installed on the movable plate on the left side, and a driven servo motor is installed on the movable plate on the right side. The output ends of the active servo motor and the output ends of the driven servo motor are respectively provided with torque sensors that pass through the movable plate and extend to the outside of it. A connecting shaft is provided at the end of the torque sensor near the reducer body, and an angle encoder is installed on the surface of the connecting shaft through a fixing sleeve.

[0009] Preferably, an annular sleeve adapted to the port of the reducer body is installed at one end of the connecting shaft near the reducer body, a positioning block is installed on the inner wall of the annular sleeve, and positioning grooves adapted to the positioning blocks are opened on both the output end and the input end of the reducer body.

[0010] Preferably, the drive lifting assembly includes a through slot, which is formed on the top of the worktable. A rotatable rotating plate is provided inside the through slot. A drive motor is installed at the bottom of the rotating plate. A connecting slot is formed at the bottom of the rotating plate. The top end of the output shaft of the drive motor passes through the connecting slot and extends into it to install a threaded rod.

[0011] Preferably, the surface of the threaded rod is threadedly connected to a movable plate, and two top blocks are installed on the top of the movable plate. The top of the top blocks passes through the connecting groove and extends to its outside. The tops of the two top blocks are fixedly connected by a base.

[0012] Preferably, the rotation adjustment assembly includes an annular cylinder, which is installed at the bottom of the worktable. A rotary motor is installed at the bottom of the annular cylinder. The top end of the output shaft of the rotary motor passes through the annular cylinder and extends into it to install an annular plate. The top of the annular plate is fixedly connected to the bottom of the rotating plate through two connecting blocks.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] 1. In the active end detection component of this utility model, the electric push rods in the two fixed slots can drive the slider to move the moving plate horizontally along the worktable, flexibly adjust the distance between the two servo motors, and adapt to reducers of different lengths. The drive lifting component drives the threaded rod to rotate through the drive motor, so that the movable plate pushes the top block and the base to rise and fall, and adapts to reducers of different height specifications. The rotation adjustment component drives the ring plate and the rotating plate to rotate through the rotation motor. With the height fine adjustment of the drive lifting component, the angle and height deviation between the input and output shafts of the reducer and the connecting shaft can be accurately corrected.

[0015] 2. The annular sleeve at the end of the connecting shaft of this utility model is precisely matched with the reducer port, and the positioning block on the inner wall of the sleeve is fitted with the positioning groove at the end of the reducer shaft, forming a rigid connection with circumferential positioning and axial fit, which avoids relative slippage caused by vibration or torque transmission during the testing process, and improves the installation efficiency of the connecting shaft and the reducer port. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0017] Figure 2 This is a three-dimensional structural diagram of the speed reducer body after disassembly.

[0018] Figure 3 This is a three-dimensional structural cross-sectional view of the present invention;

[0019] Figure 4 This is a three-dimensional cross-sectional view of the active end detection component, the drive lifting component, and the rotation adjustment component of this utility model;

[0020] Figure 5 This is a three-dimensional structural diagram of the torque sensor, annular sleeve, and positioning block of this utility model;

[0021] Figure 6 This is a three-dimensional structural diagram of the present invention from a bottom view.

[0022] In the diagram: 1. Workbench; 100. Reducer body; 2. Active end detection component; 21. Fixed groove; 22. Electric push rod; 23. Slider; 24. Moving plate; 25. Active servo motor; 26. Driven servo motor; 27. Torque sensor; 28. Connecting shaft; 29. ​​Fixed sleeve; 210. Angle encoder; 211. Annular sleeve; 212. Positioning block; 213. Positioning groove; 3. Drive lifting component; 31. Through groove; 32. Rotating plate; 33. Drive motor; 34. Connecting groove; 35. Threaded rod; 36. Movable plate; 37. Top block; 38. Base; 4. Rotation adjustment component; 41. Annular cylinder; 42. Rotary motor; 43. Annular plate; 44. Connecting block; 5. Annular groove; 6. Annular block. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figure 1-6 A gear reducer backlash detection device includes a workbench 1, which may be made of cast iron. A gear reducer body 100 is mounted on the workbench 1. A touch control screen is mounted on the top left side of the workbench 1 via a bracket and bolts. The touch control screen enables the setting and display of equipment parameters. A battery is mounted on the top left side of the workbench 1 and behind the touch control screen. The battery powers the electrical components. Support legs are mounted at the four corners of the bottom of the workbench 1 to ensure the overall stability of the device.

[0025] A movable active end detection component 2 is provided on the workbench 1. The active end detection component 2 is used to detect the reducer body 100. The movable active end detection component 2 is used to detect reducer bodies 100 of different lengths. The active end detection component 2 includes two fixed slots 21, which are respectively opened on the top of the workbench 1. An electric push rod 22 is installed on the inner wall of the fixed slot 21. A slider 23 is installed on the output end of the electric push rod 22. The surface of the slider 23 slides in contact with the inner wall of the fixed slot 21. The two ends of the electric push rod 22 are fixedly connected to the inner wall of the fixed slot 21 and the slider 23 by bolts. The electric push rod 22 drives the slider 23 to move the moving plate 24 horizontally, adjusting the distance between the two servo motors on the left and right sides. It features a built-in travel limit switch with a maximum travel of 500mm to prevent overload damage. A movable plate 24 is mounted on the top of the slider 23, and the bottom of the movable plate 24 slides in contact with the top of the worktable 1. The slider 23 slides against the inner wall of the fixed groove 21, and the movable plate 24 slides against the top of the worktable 1, improving the stability of the movable plate 24 during left and right movements and preventing deviation, thus providing a guiding effect. Both the slider 23 and the movable plate 24 are made of alloy steel. An active servo motor 25 is mounted on the left movable plate 24, and is fixedly connected to the movable plate 24 by bolts. A driven servo motor 26 is mounted on the right movable plate 24, and is fixedly connected to the right movable plate 24 by bolts. The reducer is fixedly connected to the moving plate 24. The active servo motor 25 provides controllable torque to drive the input shaft of the reducer to rotate. The driven servo motor 26 cooperates to form a torque closed loop, assisting in the acquisition of backlash data. The servo control has high precision, meeting the accurate requirements of torque and speed for backlash detection. It has a braking function, which can lock the shaft system when the detection is paused to avoid data drift. The output ends of the active servo motor 25 and the driven servo motor 26 are respectively installed through the moving plate 24 and extend to its outside, with torque sensors 27 installed. The torque sensors 27 monitor the torque value transmitted to the reducer in real time and feed it back to the control system to realize torque closed-loop control. A connecting shaft 28 is provided at the end of the torque sensor 27 near the reducer body 100. The two ends of the torque sensor 27 are respectively connected to the reducer body 100. The flange connection is fixedly connected to the motor output end and the connecting shaft 28. The connecting shaft 28 transmits the torque from the servo motor and torque sensor 27 to the reducer, and simultaneously drives the angle encoder 210 to rotate synchronously through the fixing sleeve 29, realizing the dual functions of torque transmission and angle acquisition. The connecting shaft 28 is made of alloy steel, and the angle encoder 210 is mounted on the surface of the connecting shaft 28 through the fixing sleeve 29. The fixing sleeve 29 fixes the angle encoder 210 to the surface of the connecting shaft 28, ensuring that the encoder and the connecting shaft 28 rotate synchronously without relative slippage. The fixing sleeve 29 is made of aluminum alloy, and the angle encoder 210 is installed on the fixing sleeve 29 by bolts. The angle encoder 210 acquires the angle data of the connecting shaft 28, and compares the angle difference between the active end and the driven end.The backlash value of the reducer is calculated. An annular sleeve 211, adapted to the port of the reducer body 100, is installed at the end of the connecting shaft 28 near the reducer body 100. The annular sleeve 211 is fixedly connected to the connecting shaft 28 by welding. The annular sleeve 211 precisely matches the input and output ports of the reducer, enabling rapid docking between the connecting shaft 28 and the reducer. The annular sleeve 211 is made of alloy steel, and a positioning block 212 is installed on its inner wall. The positioning block 212 is fixedly connected to the annular sleeve 211 by welding. Positioning grooves 213 adapted to the positioning blocks 212 are provided on both the output and input ends of the reducer body 100. A through-hole annular sleeve 211 is provided at the end of the reducer body 100 near the annular sleeve 211. A square-shaped sleeve 211 extends into and contacts the inner wall of the annular sleeve 211. A positioning block 212, located near the positioning groove 213, penetrates the positioning groove 213 and extends into and contacts the inner wall of the positioning groove 213. Both the positioning block 212 and the positioning groove 213 are square in shape. The positioning block 212 is welded to the inner wall of the annular sleeve 211. The positioning groove 213 is located at the input and output ends of the reducer. The two fit together to achieve circumferential positioning, preventing slippage between the connecting shaft 28 and the reducer shaft. The square structure provides a clearance of 0.01-0.02 mm, ensuring high circumferential positioning accuracy and avoiding angular lag during torque transmission. During assembly and disassembly, only alignment is required; no additional locking components are needed, improving clamping efficiency. The positioning block 212 is made of 40Cr steel.

[0026] A drive lifting assembly 3 is installed on the workbench 1. The drive lifting assembly 3 is used to adjust the height of the reducer body 100 after installation. The drive lifting assembly 3 includes a through groove 31, which is located on the top of the workbench 1. A rotatable rotating plate 32 is installed inside the through groove 31. Both the through groove 31 and the rotating plate 32 are cylindrical. The through groove 31 and the rotating plate 32 are clearance-fitted to ensure the coaxiality of the rotating plate 32 during rotation. The through groove 31 is concealed to prevent the lifting components from being exposed and damaged by collisions. The rotating plate 32 is made of alloy steel. A drive motor 33 is installed at the bottom of the rotating plate 32. The drive motor 33 is a forward and reverse rotating motor with a self-locking function and controllable speed. Different height reducers are used. The drive motor 33 is fixedly connected to the rotating plate 32 by bolts. The bottom of the rotating plate 32 has a connecting groove 34. The top of the output shaft of the drive motor 33 passes through the connecting groove 34 and extends into it to install a threaded rod 35. The threaded rod has a trapezoidal thread design, a pitch of 5mm, and good self-locking performance. The shaft end is keyed to the output shaft of the drive motor 33, ensuring stable torque transmission without slippage. The threaded rod 35 is made of alloy steel, and a movable plate 36 is threadedly connected to the surface of the threaded rod 35. The surface of the movable plate 36 slides in contact with the inner wall of the connecting groove 34, so that the rotational force of the threaded rod 35 can be converted into the force that drives the movable plate 36 to move up and down, ensuring the up and down movement of the movable plate 36. For stability during movement, two top blocks 37 are installed on the top of the movable plate 36. The top of the top blocks 37 passes through the connecting groove 34 and extends to its outside. The tops of the two top blocks 37 are fixedly connected by the base 38. The two ends of the top blocks 37 are fixedly connected to the movable plate 36 and the base 38 by welding, respectively. The movable plate 36, top blocks 37 and base 38 are all made of alloy steel. The base 38 supports the reducer body 100. The top blocks 37 connect the movable plate 36 and the base 38, transmit lifting force, and support the base 38 to keep it horizontal. The bottom of the base 38 is in contact with the top of the worktable 1. The reducer body 100 is connected to the base 38 by the bottom mounting seat and bolts. The drive motor 3 3. By driving the threaded rod 35 to rotate, the base 38 can be driven to move up and down linearly to adjust the height of the reducer body 100. The surface of the rotating plate 32 is provided with an annular groove 5. An annular block 6 is installed on the inner wall of the through groove 31, which rotates in contact with the inner wall of the annular groove 5. The annular block 6 is fixedly connected to the inner wall of the through groove 31 by welding. The annular block 6 is made of stainless steel and the surface is polished to reduce the friction generated when the annular block 6 rotates with the annular groove 5. By setting the annular groove 5 and the annular block 6, the stability of the rotating plate 32 during rotation is improved, and the phenomenon of the rotating plate 32 detaching from the through groove 31 is avoided, so that the rotating plate 32 can only generate rotational force.

[0027] A rotary adjustment assembly 4 is provided on the worktable 1. The rotary adjustment assembly 4 drives the reducer body 100 to rotate through the drive lifting assembly 3, ensuring that the output shaft and input shaft of the reducer body 100 are concentric with the detection shaft on the active end detection assembly 2. The rotary adjustment assembly 4 includes an annular cylinder 41, which is installed at the bottom of the worktable 1 and is fixedly connected to the worktable 1 by welding. The annular cylinder 41 is made of alloy steel, and a rotary motor 42 is installed at the bottom of the annular cylinder 41. The rotary motor 42 is a forward and reverse reversible motor with a self-locking function. The rotary motor 42 has an angle adjustment accuracy of ±0.1° and can rotate 360°, ensuring that the concentricity deviation between the reducer shaft and the connecting shaft 28 is <0.02mm. The top end of the output shaft of the rotary motor 42 passes through the annular cylinder 41 and extends into it, where an annular plate 43 is installed. The surface of the annular plate 43 is in rotational contact with the inner wall of the annular cylinder 41, thereby improving the stability of the annular plate 43 during rotation. The top of the annular plate 43 is fixedly connected to the bottom of the drive motor 33 by bolts. The annular plate 43 bears the driving force of the rotary motor 42 and drives the rotating plate 32 through the connecting block 44. The rotating plate 43 rotates in conjunction with the annular cylinder 41 to ensure stable rotation. The top of the annular plate 43 is fixedly connected to the bottom of the rotating plate 32 via two connecting blocks 44. Both the annular plate 43 and the connecting blocks 44 are made of alloy steel. The connecting blocks 44 transmit the torque of the rotary motor 42, causing the rotating plate 32 to rotate synchronously. The rotary motor 42 drives the annular plate 43 and the rotating plate 32 to rotate via its output shaft, thereby driving the base 38 to rotate and correcting the angular deviation between the reducer shaft and the connecting shaft 28. The drivers of the active servo motor 25 and the driven servo motor 26 receive commands from the control panel. Torque and speed parameters provide feedback on the motor's operating status; torque sensor 27 and angle encoder 210 receive real-time torque and angle data collected by the sensors and transmit them to the control screen for display; controllers for electric push rod 22, drive motor 33, and rotary motor 42 receive spacing adjustment, height adjustment, and rotation correction commands from the control screen and provide feedback on the execution progress. The touch control screen is connected to the equipment control module via shielded twisted-pair cables. The control module is then cascaded with the main servo motor driver, torque sensor 27, angle encoder 210, and each motor controller to realize command issuance and data upload.

[0028] Height correction: Drive motor 33 is started via touch control screen. Its output shaft drives threaded rod 35 to rotate. Movable plate 36, which is threaded to threaded rod 35, slides upward along the inner wall of connecting groove 34. The top block 37 pushes base 38 and reducer body 100 to rise and fall synchronously. During the process, the height is adjusted to be consistent with the axis of axis of axis of axis of axis of axis of connecting shaft 28 via real-time height display on touch control screen. Then drive motor 33 self-locks to lock the current height.

[0029] Angle Correction: If there is an angular deviation between the reducer shaft and the connecting shaft 28, visually observe the fit between the annular sleeve 211 and the reducer port. Drive the rotary motor 42 through the touch control screen to start. Its output shaft drives the annular plate 43 to rotate inside the annular cylinder 41. Through the two connecting blocks 44, the rotating plate 32 rotates synchronously. The rotating plate 32 drives the drive lifting assembly 3 and the reducer body 100 to rotate as a whole. Adjust the angle range from 0 to 360° until the annular sleeve 211 and the reducer port are completely fitted, and the positioning block 212 and the positioning groove 213 are tightly engaged. At this time, the concentricity deviation between the reducer input and output shafts and the connecting shaft 28 is ≤0.02mm. The rotary motor 42 self-locks, and the correction is completed.

[0030] When in use, start the touch control screen and enter the detection system interface. According to the model of the reducer body 100 to be tested, such as length, height, input and output shaft diameter, rated torque, preset parameters on the control screen, including the output torque range, speed and detection time of the active servo motor 25.

[0031] Place the reducer body 100 on the base 38 of the drive lifting assembly 3, align the mounting base at the bottom of the reducer with the oblong hole on the surface of the base 38, and fix the two with bolts to ensure that the reducer does not shift during the test. At this time, it is necessary to observe the position of the input and output shafts of the reducer to ensure that they are roughly facing the direction of the connecting shaft 28 to avoid insufficient adjustment stroke later.

[0032] When the spacing adjustment command is triggered on the touch control screen, the electric push rods 22 in the two fixed slots 21 are started synchronously, pushing the slider 23 to drive the top moving plate 24 to slide horizontally along the worktable. The left moving plate 24 drives the active servo motor 25 and the right moving plate 24 drives the driven servo motor 26, gradually approaching the reducer body 100 until the annular sleeve 211 at the end of the connecting shaft 28 can be fitted into the input and output ports of the reducer. At the same time, it ensures that the positioning block 212 is fully embedded in the positioning slot 213 to form circumferential positioning and avoid relative slippage during torque transmission.

[0033] Click "Start Detection" on the control screen. The active servo motor 25 outputs power according to the preset torque. The torque is transmitted to the connecting shaft 28 through the torque sensor 27, and then drives the input shaft of the reducer to rotate through the annular sleeve 211. At the same time, the driven servo motor 26 cooperates in loading and provides reverse damping torque according to preset parameters to simulate the actual working load of the reducer and form a torque closed loop. During the detection process, the angle encoder 210 on the surface of the connecting shaft 28 rotates synchronously with the connecting shaft 28 through the fixed sleeve 29, and collects the rotation angle data of the active end and the driven end in real time. The torque sensor 27 monitors the transmitted torque value in real time. If the torque exceeds the preset range, the system automatically pauses the detection and alarms. The control system automatically calculates the backlash value by comparing the rotation angle difference between the active end and the driven end, that is, the idle angle when the reducer rotates forward and reverse, and displays the detection curve and real-time backlash data on the touch control screen in real time.

[0034] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A gearbox backlash detection device, characterized in that: The system includes a workbench (1), on which a movable active end detection component (2) is provided. A speed reducer body (100) is provided on the workbench (1). The active end detection component (2) is used to detect the speed reducer body (100). The movable active end detection component (2) is used to detect speed reducer bodies (100) of different lengths. A drive lifting component (3) is provided on the workbench (1). The drive lifting component (3) is used to adjust the height of the speed reducer body (100) after installation. A rotation adjustment component (4) is provided on the workbench (1). The rotation adjustment component (4) drives the speed reducer body (100) to rotate through the drive lifting component (3), ensuring that the output shaft and input shaft of the speed reducer body (100) and the detection shaft on the active end detection component (2) are in a concentric state.

2. The gearbox backlash detection device according to claim 1, characterized in that: The active end detection component (2) includes a fixed groove (21), there are two fixed grooves (21) and they are respectively opened on the top of the workbench (1). An electric push rod (22) is installed on the inner wall of the fixed groove (21), a slider (23) is installed on the output end of the electric push rod (22), and a moving plate (24) is installed on the top of the slider (23).

3. The gearbox backlash detection device according to claim 2, characterized in that: An active servo motor (25) is installed on the movable plate (24) on the left side, and a driven servo motor (26) is installed on the movable plate (24) on the right side. The output ends of the active servo motor (25) and the driven servo motor (26) are respectively installed through the movable plate (24) and extend to the outside of it. A torque sensor (27) is provided at the end of the torque sensor (27) near the reducer body (100). An angle encoder (210) is installed on the surface of the connecting shaft (28) through a fixing sleeve (29).

4. The gearbox backlash detection device according to claim 3, characterized in that: The connecting shaft (28) is equipped with an annular sleeve (211) that is compatible with the port of the reducer body (100) at one end. A positioning block (212) is installed on the inner wall of the annular sleeve (211). Positioning grooves (213) that are compatible with the positioning block (212) are opened on both the output end and the input end of the reducer body (100).

5. The gearbox backlash detection device according to claim 4, characterized in that: The drive lifting assembly (3) includes a through slot (31) which is located on the top of the workbench (1). A rotatable rotating plate (32) is provided inside the through slot (31). A drive motor (33) is installed at the bottom of the rotating plate (32). A connecting slot (34) is provided at the bottom of the rotating plate (32). The top end of the output shaft of the drive motor (33) passes through the connecting slot (34) and extends into it to install a threaded rod (35).

6. The gearbox backlash detection device according to claim 5, characterized in that: The threaded rod (35) has a movable plate (36) threadedly connected to its surface. Two top blocks (37) are installed on the top of the movable plate (36). The top of the top blocks (37) passes through the connecting groove (34) and extends to its outside. The tops of the two top blocks (37) are fixedly connected by a base (38).

7. The gearbox backlash detection device according to claim 6, characterized in that: The rotation adjustment assembly (4) includes an annular cylinder (41), which is installed at the bottom of the workbench (1). A rotary motor (42) is installed at the bottom of the annular cylinder (41). The top end of the output shaft of the rotary motor (42) passes through the annular cylinder (41) and extends into it to install an annular plate (43). The top of the annular plate (43) is fixedly connected to the bottom of the rotating plate (32) through two connecting blocks (44).

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