High-end mechanical gear part decontamination device
By designing an automated gear component cleaning device, which employs components such as servo motors and hot air blowers, the automatic removal, water control, and drying of gear components are achieved. This solves the problems of cumbersome operation and slow drying speed in existing technologies, and improves efficiency.
Patent Information
- Application Number
- CN202422905691.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-27
- Publication Date
- 2025-11-04
- Estimated Expiration
- 2034-11-27
AI Technical Summary
Existing cleaning devices require manual removal and drying of mechanical gear parts after cleaning, which is cumbersome and slow, affecting efficiency.
A high-end mechanical gear component cleaning device was designed, which uses servo motors and hot air blowers to automatically retrieve, control water, and dry gear components. The device reduces manual operation through a combination of ultrasonic cleaning, conveyor belt conveying, and hot air drying.
The automated process of retrieving, controlling water, and drying gear parts has been achieved, improving operational efficiency, reducing manual intervention, and shortening drying time.
Smart Images

Figure CN223505768U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of decontamination device technology, specifically a decontamination device for high-end mechanical gear parts. Background Technology
[0002] During the machining of mechanical gear components, whether it's cutting processes like turning, milling, grinding, planing, drilling, boring, or stamping, stretching, lapping, and polishing, machining oil is needed as a lubricant or coolant to protect the material from damage, extend the lifespan of cutting tools and dies, and ensure the machining accuracy of the components. However, if machining oil adheres to the parts, subsequent assembly cannot be completed. Furthermore, during the machining process, a large amount of metal particles and non-metallic fixed contaminants are generated and adhere to the parts. If not cleaned properly, this will affect the lifespan and performance of the assembled product. The cleaning process is essential for removing these contaminants from the parts and is a necessary step in the machining of most mechanical gear components. Therefore, a decontamination device is usually used. However, in actual use, after cleaning, the gear components often require manual removal to drain the water and air dry, which is cumbersome and results in slow drying, making it unsuitable for use. Therefore, a high-end decontamination device for mechanical gear components is proposed. Utility Model Content
[0003] (a) Technical problems to be solved
[0004] To address the shortcomings of existing technologies, this utility model provides a high-end mechanical gear component cleaning device, which has advantages such as ease of use. It solves the problem that in the actual use of existing cleaning devices, after the gear components are cleaned, manual removal of the components to drain water and air dry is often required, which is cumbersome and the drying speed of the components is slow, thus making them unsuitable for use.
[0005] (II) Technical Solution
[0006] To achieve the aforementioned ease of use, this utility model provides the following technical solution: a high-end mechanical gear component cleaning device, comprising a frame, with support feet at both the front and rear ends of the left and right sides of the bottom of the frame, an L-shaped plate on the top left side of the frame, a cleaning tank located below the L-shaped plate and extending into the interior of the frame at one end on the top of the frame, an ultrasonic generator located below the cleaning tank on the left side of the inner bottom wall of the frame, a transducer located on the inner bottom wall of the cleaning tank, a controller located on the top left side of the L-shaped plate, a servo motor located on the bottom left side of the L-shaped plate, and a bottom... A fixed block is provided on the right side. The output shaft of the servo motor has a first threaded rod whose end is movably connected to the left side of the fixed block. A limiting groove is provided at the bottom of the L-shaped plate above the first threaded rod. A movable block is provided on the left side inside the limiting groove, one end of which is threaded to the outside of the first threaded rod. Mounting frames are provided on both the front and rear sides of the bottom of the movable block. Two second threaded rods are provided at the bottom of the movable block, each located inside one of the two mounting frames. Traction blocks are provided inside each of the two mounting frames, each threaded to the outside of one of the two second threaded rods and extending one end into the cleaning tank. Each block has a connecting block at its bottom, and a screen is positioned between two connecting blocks above the transducer. A drive assembly is located at the bottom of the moving block, with its front and rear ends extending into the interior of two mounting frames and fixedly connected to the outer sides of two second threaded rods. A rectangular hole is located on the right side of the cleaning tank at the top of the frame. A mounting shaft extending to the rear of the frame is located at both ends of the front side of the inner wall of the rectangular hole. Drive rollers are located on the outer sides of the two mounting shafts at their inner ends within the rectangular hole. A conveyor belt is positioned between the two drive rollers. A mounting belt is located on the left side of the rear of the frame. The U-shaped frame on the outer side of the mounting shaft has a geared motor installed on the rear inner wall of the U-shaped frame. The output shaft of the geared motor is fixedly connected to the rear side of the left mounting shaft. An electric telescopic rod is installed at the bottom left side of the L-shaped plate. The output end of the electric telescopic rod extends to the right side of the L-shaped plate and is equipped with a push plate located above the washing tank. A U-shaped plate is installed on the top right side of the frame above the conveyor belt. A drying component is installed on the inner top wall of the U-shaped plate, with one end extending to its top. A guide plate is installed on the right side of the inner top wall of the frame, with one end extending below the conveyor belt. A collection box is installed on the inner bottom wall of the frame below the guide plate.
[0007] Preferably, the drive assembly includes a dual-axis servo motor. The dual-axis servo motor is fixedly mounted on the bottom of the moving block between two mounting frames. Two support blocks are fixedly mounted on the bottom of the moving block, located on the front and rear sides of the dual-axis servo motor respectively. A transmission shaft is fixedly mounted on the front and rear output shafts of the dual-axis servo motor, with one end passing through the two support blocks and extending into the interior of the two mounting frames respectively. A drive bevel gear is fixedly mounted on the opposite sides of the two transmission shafts. A driven bevel gear is fixedly mounted on the outer side of the two second threaded rods, located above the traction block and with one end meshing with the two drive bevel gears respectively.
[0008] Preferably, the drying assembly includes a hot air blower, which is fixedly installed on the top right side of the U-shaped plate. An air supply pipe extending into the interior of the U-shaped plate is fixedly installed at the air outlet end of the hot air blower, and a jet nozzle located above the conveyor belt and fixedly connected at one end to the inner top wall of the U-shaped plate is fixedly installed at the bottom of the air supply pipe.
[0009] Preferably, a first bearing is fixedly installed on the left side of the fixing block, and the first threaded rod is rotatably connected to the left side of the fixing block through the first bearing.
[0010] Preferably, the bottom of the movable block is fixedly equipped with two second bearings, each located inside a separate mounting frame, and the second threaded rod is rotatably connected to the bottom of the movable block through the second bearings.
[0011] Preferably, a third bearing is fixedly installed at both ends of the front side of the inner wall of the rectangular hole, and the mounting shaft is rotatably connected to the front side of the inner wall of the rectangular hole through the third bearing.
[0012] (III) Beneficial Effects
[0013] Compared with the prior art, this utility model provides a high-end mechanical gear component cleaning device, which has the following beneficial effects:
[0014] This high-end mechanical gear component cleaning device uses a dual-axis servo motor to drive two transmission shafts and two drive bevel gears to rotate. These bevel gears then drive two second threaded rods to rotate. During rotation, the second threaded rods move two traction blocks, two connecting blocks, a screen, and the gear components upwards, thus retrieving the gear components from the cleaning tank until the tops of the two connecting blocks are aligned with the bottoms of the two mounting frames. This process drains the water from the gear components. After draining, the servo motor is activated to drive the first threaded rod to rotate, which in turn moves the moving block, screen, and gear components to the right until the right end of the screen is above the conveyor belt. The electric telescopic rod can be activated to move the push plate to the right, pushing the gear components on the screen to the top of the conveyor belt. Then, the geared motor can be activated to rotate the left mounting shaft, which in turn drives the conveyor belt to rotate via the transmission rollers, moving the gear components below the air nozzle. The hot air blower is then activated to deliver hot air into the air nozzle, which is then sprayed onto the gear components to dry them. After drying, the geared motor can be activated again to move the gear components to the right, causing them to fall from the guide plate into the collection box. This automatically retrieves, drains, and dries the gear components, eliminating the need for manual operation and making it more convenient for users. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the structure of this utility model;
[0016] Figure 2 This is a partial cross-sectional view of the right side of the movable block of this utility model;
[0017] Figure 3 This is a partial top-view cross-sectional diagram of the U-shaped plate of this utility model.
[0018] In the diagram: 1. Frame, 2. Supporting leg, 3. L-shaped plate, 4. Cleaning tank, 5. Ultrasonic generator, 6. Transducer, 7. Controller, 8. Servo motor, 9. Fixing block, 10. First threaded rod, 11. Limiting groove, 12. Moving block, 13. Mounting frame, 14. Second threaded rod, 15. Traction block, 16. Connecting block, 17. Screen, 18. Drive assembly, 181. Dual-axis servo motor, 182. Supporting block, 183. Drive shaft, 184. Drive bevel gear, 185. Driven bevel gear, 19. Rectangular hole, 20. Mounting shaft, 21. Drive roller, 22. Conveyor belt, 23. U-shaped frame, 24. Gear motor, 25. Electric telescopic rod, 26. Push plate, 27. U-shaped plate, 28. Drying assembly, 281. Hot air blower, 282. Air pipe, 283. Air nozzle, 29. Guide plate, 30. Collection box. Detailed Implementation
[0019] 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.
[0020] Please see Figure 1-3 This utility model provides a technical solution: a high-end mechanical gear parts cleaning device, including a frame 1, with support feet 2 fixedly installed at the front and rear ends of the left and right sides of the bottom of the frame 1, an L-shaped plate 3 fixedly installed on the top left side of the frame 1, a cleaning tank 4 fixedly installed on the top of the frame 1 below the L-shaped plate 3 and extending into the interior of the frame 1 at one end, an ultrasonic generator 5 fixedly installed on the left side of the inner bottom wall of the frame 1 below the cleaning tank 4, a transducer 6 fixedly installed on the inner bottom wall of the cleaning tank 4, and a controller 7 fixedly installed on the top left side of the L-shaped plate 3, the controller 7 being of model CPM1A-10CDR-A-V1.
[0021] A servo motor 8 is fixedly installed on the bottom left side of the L-shaped plate 3. The model of the servo motor 8 can be MR-J2S-10A. A fixing block 9 is fixedly installed on the bottom right side of the L-shaped plate 3. A first threaded rod 10 with one end movably connected to the left side of the fixing block 9 is fixedly installed on the output shaft of the servo motor 8. A first bearing is fixedly installed on the left side of the fixing block 9. The first threaded rod 10 is rotatably connected to the left side of the fixing block 9 through the first bearing. A limiting groove 11 is opened at the bottom of the L-shaped plate 3 above the first threaded rod 10. A moving block 12 with one end threadedly connected to the outside of the first threaded rod 10 is movably installed on the left side inside the limiting groove 11. A threaded hole adapted to the first threaded rod 10 is opened inside the moving block 12.
[0022] Mounting frames 13 are fixedly installed on both the front and rear sides of the bottom of the movable block 12. Two second threaded rods 14 are movably installed on the bottom of the movable block 12 and are located inside the two mounting frames 13 respectively. Two second bearings are fixedly installed on the bottom of the movable block 12 and are located inside the two mounting frames 13 respectively. The second threaded rods 14 are rotatably connected to the bottom of the movable block 12 through the second bearings. Traction blocks 15 are movably installed inside the two mounting frames 13, which are threaded to the outside of the two second threaded rods 14 respectively and extend one end into the cleaning tank 4. The top of the two traction blocks 15 is provided with threaded grooves that are adapted to the two second threaded rods 14 respectively. Connecting blocks 16 are fixedly installed on the bottom of the two traction blocks 15. A screen 17 located above the transducer 6 is fixedly installed between the two connecting blocks 16.
[0023] A drive assembly 18 is fixedly installed at the bottom of the moving block 12. The front and rear ends of the drive assembly 18 extend into the interior of the two mounting frames 13 and are fixedly connected to the outer sides of the two second threaded rods 14. The drive assembly 18 includes a dual-axis servo motor 181. The dual-axis servo motor 181 located between the two mounting frames 13 is fixedly installed at the bottom of the moving block 12. The model of the dual-axis servo motor 181 can be HDMF2089050. Two support blocks 182 are fixedly installed at the bottom of the moving block 12 and are located on the front and rear sides of the dual-axis servo motor 181, respectively. A transmission shaft 183 is fixedly installed on the front and rear output shafts of the dual-axis servo motor 181, with one end passing through the two support blocks 182 and extending into the interior of the two mounting frames 13, respectively. Drive bevel gears 184 are fixedly installed on the opposite sides of the two transmission shafts 183. Driven bevel gears 185 located above the traction block 15 and with one end meshing with the two drive bevel gears 184 are fixedly installed on the outer sides of the two second threaded rods 14, respectively.
[0024] A rectangular hole 19 is provided on the top of the frame 1, located on the right side of the cleaning tank 4. A mounting shaft 20, extending to the rear side of the frame 1, is movably mounted at both ends of the front side of the inner wall of the rectangular hole 19. Third bearings are fixedly mounted at both ends of the front side of the inner wall of the rectangular hole 19. The mounting shafts 20 are rotatably connected to the front side of the inner wall of the rectangular hole 19 via the third bearings. Drive rollers 21 are fixedly mounted on the outer sides of the two mounting shafts 20 at one end inside the rectangular hole 19. A conveyor belt 22 is connected between the two drive rollers 21. The rear side of the frame 1 is fixed... A U-shaped frame 23 is installed on the outside of the left mounting shaft 20. A geared motor 24 is fixedly installed on the rear side of the inner wall of the U-shaped frame 23. The model of the geared motor 24 can be BWY27-23-7.5. The output shaft of the geared motor 24 is fixedly connected to the rear side of the left mounting shaft 20. An electric telescopic rod 25 is fixedly installed on the bottom left side of the L-shaped plate 3. The model of the electric telescopic rod 25 can be YNT-03. The output end of the electric telescopic rod 25 extends to the right side of the L-shaped plate 3 and a push plate 26 located above the cleaning pool 4 is fixedly installed thereon.
[0025] A U-shaped plate 27 is fixedly installed on the top right side of the frame 1, above the conveyor belt 22. A drying component 28 extending to the top of the U-shaped plate 27 is fixedly installed on the inner top wall of the U-shaped plate 27. The drying component 28 includes a hot air blower 281. The hot air blower 281 is fixedly installed on the top right side of the U-shaped plate 27. The hot air blower 281 can be of model HLJT-3380-006. An air supply pipe 282 extending into the U-shaped plate 27 is fixedly installed at the air outlet end of the hot air blower 281. A jet nozzle 283 is fixedly installed at the bottom of the air supply pipe 282, above the conveyor belt 22, and one end is fixedly connected to the inner top wall of the U-shaped plate 27. A guide plate 29 extending below the conveyor belt 22 is fixedly installed on the inner top right side of the frame 1. A collection box 30 located below the guide plate 29 is placed on the inner bottom wall of the frame 1. A rubber pad is fixedly installed on the inner bottom wall of the collection box 30. All electrical components mentioned in the text are electrically connected to the controller 7 and the power supply.
[0026] In use, the mechanical gear components are placed on top of the screen 17, and cleaning solvent is injected into the cleaning tank 4 to immerse the mechanical gear components in the solvent. Then, the controller 7 activates the ultrasonic generator 5 and transducer 6. The ultrasonic generator 5 emits a high-frequency oscillation signal, which is converted into high-frequency mechanical oscillation by the transducer 6 and propagated into the cleaning solvent to clean and remove contaminants from the mechanical gear components. After cleaning, the controller 7 activates the dual-axis servo motor 181 to drive the two drive shafts 183 and two drive bevel gears 184 to rotate. This, in turn, drives the two driven bevel gears 185 to rotate the two second threaded rods 14. During rotation, the two second threaded rods 14 move the two traction blocks 15, two connecting blocks 16, the screen 17, and the gear components upwards, thus removing the gear components from the cleaning tank 4 until the tops of the two connecting blocks 16 are aligned with the bottoms of the two mounting frames 13, thereby controlling the water flow to the gear components. After water control is complete, the controller... The controller 7 starts the servo motor 8 to drive the first threaded rod 10 to rotate, thereby moving the moving block 12, screen 17 and gear components to the right until the right end of the screen 17 is above the conveyor belt 22. At this time, the controller 7 can start the electric telescopic rod 25 to drive the push plate 26 to move to the right, thereby pushing the gear components on the screen 17 to the top of the conveyor belt 22. Then, the reducer motor 24 can be started to drive the left mounting shaft 20 to rotate, which in turn drives the conveyor belt 22 to rotate through the transmission roller 21, thereby moving the gear components to below the air nozzle 283. Then, the controller 7 starts the hot air blower 281 to deliver hot air into the air nozzle 283, which is then sprayed onto the gear components to dry them. After drying, the reducer motor 24 can be started again to drive the gear components to move to the right, so that the gear components fall from the guide plate 29 into the collection box 30, thereby automatically picking up, draining and drying the gear components without manual operation, thus making it convenient for users.
[0027] In summary, this high-end mechanical gear component cleaning device uses a dual-axis servo motor 181 to drive two transmission shafts 183 and two drive bevel gears 184 to rotate. This, in turn, drives two driven bevel gears 185 to rotate two second threaded rods 14. During rotation, the two second threaded rods 14 move two traction blocks 15, two connecting blocks 16, a screen 17, and the gear components upwards, thus removing the gear components from the cleaning tank 4. Water is then drained from the gear components until the tops of the two connecting blocks 16 are aligned with the bottoms of the two mounting frames 13. After water draining, the servo motor 8 is activated to drive the first threaded rod 10 to rotate, which in turn moves the moving block 12, the screen 17, and the gear components to the right until the right end of the screen 17 is above the conveyor belt 22. At this point, the electric telescopic rod 25 is activated to move the push plate 26 to the right, thereby removing the gears from the screen 17. The parts are pushed to the top of the conveyor belt 22, and then the reduction motor 24 is started to drive the left mounting shaft 20 to rotate. This, in turn, drives the conveyor belt 22 to rotate via the transmission roller 21, thereby moving the gear parts to below the air nozzle 283. Then, the hot air blower 281 is started to deliver hot air into the air nozzle 283, which is then sprayed onto the gear parts to dry them. After drying, the reduction motor 24 is started again to move the gear parts to the right, so that the gear parts fall into the collection box 30 from the guide plate 29. This automatically removes the gear parts, drains the water, and dries them, eliminating the need for manual operation. This makes it more convenient for users and solves the problem that in the actual use of existing cleaning devices, after cleaning, the gear parts often need to be manually removed, drained, and dried, which is cumbersome and slow, making them unsuitable for use.
[0028] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0029] 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 high-end mechanical gear component cleaning device, comprising a frame (1), wherein support feet (2) are provided at both the front and rear ends of the left and right sides of the bottom of the frame (1), an L-shaped plate (3) is provided on the top left side of the frame (1), a cleaning tank (4) is provided on the top of the frame (1) below the L-shaped plate (3) and extending into the interior of the frame (1) at one end, an ultrasonic generator (5) is provided on the left side of the inner bottom wall of the frame (1) below the cleaning tank (4), a transducer (6) is provided on the inner bottom wall of the cleaning tank (4), and a controller (7) is provided on the top left side of the L-shaped plate (3), characterized in that: A servo motor (8) is provided on the bottom left side of the L-shaped plate (3), and a fixing block (9) is provided on the bottom right side of the L-shaped plate (3). The output shaft of the servo motor (8) is provided with a first threaded rod (10) whose end is movably connected to the left side of the fixing block (9). A limiting groove (11) is provided on the bottom of the L-shaped plate (3) above the first threaded rod (10). A moving block (12) whose end is threaded to the outside of the first threaded rod (10) is provided on the left side inside the limiting groove (11). Mounting frames (13) are provided on both the front and rear sides of the bottom of the moving block (12). Two mounting frames are provided on the bottom of the moving block (12) and are located on two sides respectively. The second threaded rod (14) is located inside each of the two mounting frames (13). Each mounting frame (13) has a traction block (15) that is threaded to the outer side of the two second threaded rods (14) and extends one end into the cleaning tank (4). A connecting block (16) is located at the bottom of each of the two traction blocks (15). A screen (17) is located between the two connecting blocks (16) above the transducer (6). A drive assembly (18) is located at the bottom of the moving block (12). The front and rear ends of the drive assembly (18) extend into the two mounting frames (13) and are fixedly connected to the outer side of the two second threaded rods (14). A rectangular hole (19) is provided at the top of the frame (1) on the right side of the cleaning tank (4). At both ends of the front side of the inner wall of the rectangular hole (19), there is a mounting shaft (20) extending to the rear side of the frame (1). A transmission roller (21) is provided on the outer side of one end of each mounting shaft (20) inside the rectangular hole (19). A conveyor belt (22) is provided between the two transmission rollers (21). A U-shaped frame (23) is provided on the rear side of the frame (1) outside the left mounting shaft (20). A reduction motor (24) is provided on the rear side of the inner wall of the U-shaped frame (23). The output shaft of the reduction motor (24) is connected to the rear side of the left mounting shaft (20). The L-shaped plate (3) is fixedly connected to the side. An electric telescopic rod (25) is provided at the bottom left side of the L-shaped plate (3). The output end of the electric telescopic rod (25) extends to the right side of the L-shaped plate (3) and is provided with a push plate (26) located above the washing tank (4). A U-shaped plate (27) located above the conveyor belt (22) is provided on the top right side of the frame (1). A drying component (28) is provided on the inner top wall of the U-shaped plate (27) with one end extending to its top. A guide plate (29) is provided on the right side of the inner top wall of the frame (1) with one end extending to the bottom of the conveyor belt (22). A collection box (30) located below the guide plate (29) is provided on the inner bottom wall of the frame (1).
2. The high-end mechanical gear component cleaning device according to claim 1, characterized in that: The drive assembly (18) includes a dual-axis servo motor (181). The bottom of the moving block (12) is fixedly mounted with the dual-axis servo motor (181) located between the two mounting frames (13). The bottom of the moving block (12) is fixedly mounted with two support blocks (182) located on the front and rear sides of the dual-axis servo motor (181). The output shafts on the front and rear sides of the dual-axis servo motor (181) are each fixedly mounted with a drive shaft (183) that passes through the two support blocks (182) and extends into the two mounting frames (13). The opposite sides of the two drive shafts (183) are each fixedly mounted with a drive bevel gear (184). The outer sides of the two second threaded rods (14) are each fixedly mounted with a driven bevel gear (185) located above the traction block (15) and one end of which meshes with the two drive bevel gears (184).
3. The high-end mechanical gear component cleaning device according to claim 1, characterized in that: The drying assembly (28) includes a hot air blower (281). The hot air blower (281) is fixedly installed on the top right side of the U-shaped plate (27). An air supply pipe (282) extending into the U-shaped plate (27) is fixedly installed at the air outlet end of the hot air blower (281). A jet nozzle (283) located above the conveyor belt (22) and fixedly connected at one end to the inner top wall of the U-shaped plate (27) is fixedly installed at the bottom of the air supply pipe (282).
4. The high-end mechanical gear component cleaning device according to claim 1, characterized in that: A first bearing is fixedly installed on the left side of the fixed block (9), and the first threaded rod (10) is rotatably connected to the left side of the fixed block (9) through the first bearing.
5. A high-end mechanical gear component cleaning device according to claim 1, characterized in that: The bottom of the movable block (12) is fixedly equipped with two second bearings, which are located inside two mounting frames (13) respectively. The second threaded rod (14) is rotatably connected to the bottom of the movable block (12) through the second bearings.
6. The high-end mechanical gear component cleaning device according to claim 1, characterized in that: The left and right ends of the inner wall of the rectangular hole (19) are fixedly installed with third bearings, and the mounting shaft (20) is rotatably connected to the inner wall of the rectangular hole (19) through the third bearings.