An electromagnetic expansion valve for new energy vehicles and its automatic assembly equipment

Abstract

This invention discloses an electromagnetic expansion valve for new energy vehicles and its automatic assembly equipment. The invention includes an expansion valve housing and an assembly equipment body. The expansion valve housing includes a valve box, a magnetic box is fixedly installed on the top of the valve box, and a support column is fixedly installed inside the magnetic box. In this invention, through the opening and closing structure, after the magnetic ring is energized, the rotor is subjected to magnetic force and rotates, thereby driving the bidirectional lead screw to rotate. Since the threads on both sides of the bidirectional lead screw are opposite, the two threaded plates move in opposite directions simultaneously. Due to the hinge of the second hinge rod, when the threaded plates move, they can drive the two hinged rods to move in opposite directions, thereby driving the connecting plate to rotate. This allows the valve hole to rotate to the direction of the baffle, at which point the inlet column and outlet column are connected, and the valve body opens. This structure, by driving the connecting plate to rotate through the bidirectional lead screw, avoids the poor rotation effect in traditional devices, improves the torque during opening and closing, and thus achieves smooth opening and closing.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic expansion valve technology, and more specifically, to an electromagnetic expansion valve for new energy vehicles and its automatic assembly equipment. Background Technology

[0002] Solenoid valves are electromagnetically controlled industrial devices, fundamental components of automation systems used to control fluids. They are actuators, but not limited to hydraulic or pneumatic systems. Used in industrial control systems to adjust the direction, flow rate, speed, and other parameters of the medium. Solenoid valves can be used with different circuits to achieve the desired control, ensuring both precision and flexibility. There are many types of solenoid valves, each playing a different role in the control system. The most common types include expansion valves, check valves, safety valves, directional control valves, and speed control valves.

[0003] Currently, most existing electromagnetic expansion valves operate by using a rotor that is subjected to magnetic force to drive the valve body to open and close. However, in practice, the valve may be difficult to open and close due to the resistance of air pressure difference, resulting in uneven valve opening and closing. In addition, new energy vehicles are inevitably subjected to bumps when driving on the road, so the electromagnetic valve may become loose and fall off. Furthermore, existing electromagnetic expansion valve assembly equipment cannot automatically feed materials, resulting in slow work efficiency. Therefore, a new device needs to be designed to solve the above problems. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, the present invention aims to provide an electromagnetic expansion valve for new energy vehicles and its automatic assembly equipment, which features smooth opening and closing, shock absorption, and automatic feeding and unloading.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the present invention provides the following technical solution: An automatic assembly equipment for electromagnetic expansion valves in new energy vehicles comprises an expansion valve housing and an assembly equipment body. The expansion valve housing includes a valve box, a magnetic box is fixedly installed on the top of the valve box, a support column is fixedly installed inside the magnetic box, a magnetic ring is fixedly sleeved on the outer surface of the support column, a rotor is fixedly sleeved inside the support column, a connection hole is opened on the top of the valve box, a baffle plate is fixedly installed inside the valve box, and an opening and closing structure is fixedly installed inside the valve box. The opening and closing structure includes two support plates, a bidirectional lead screw is fixedly sleeved inside the two support plates, the top of the bidirectional lead screw is fixedly connected to the rotor, and two threads are installed on the outer surface of the bidirectional lead screw. Two threaded plates have support rods fixedly installed on one side of their outer surfaces. Two hinge seats are fixedly installed on one side of the outer surfaces of the two support rods. The support rods fixedly installed on the upper threaded plate and the lower threaded plate are movably installed together. The support rods fixedly installed on the lower threaded plate and the upper threaded plate are movably installed together. A rotating shaft is fixedly sleeved inside the valve box. A connecting plate is fixedly sleeved at one end of the rotating shaft. Two hinge rods are hingedly installed on one side of the outer surfaces of the two hinge seats. One end of each hinge rod is fixedly sleeved to the connecting plate. A valve column is fixedly installed on one side of the outer surface of the connecting plate, and the valve column penetrates through a barrier plate. Support rods are hingedly installed on both sides of the outer surface of the valve box. A shock-absorbing structure is fixedly installed at the bottom of each of the two support rods.

[0008] As a preferred embodiment, a baffle is fixedly installed inside the valve box, the baffle is in close contact with the valve column, a valve hole is opened on one side of the outer surface of the valve column, an inlet column is fixedly installed on one side of the outer surface of the valve box, the inlet column is connected to the baffle, and an outlet column is fixedly installed on one side of the outer surface of the valve box, the outlet column is connected to the valve column.

[0009] As a preferred embodiment, the two shock-absorbing structures include a pressure plate, with spring columns fixedly installed on both sides of the bottom of the pressure plate, a limit box fixedly installed at the bottom of the spring columns, and a limit column fixedly installed inside the limit box.

[0010] As a preferred embodiment, compression springs are fixedly installed on both sides of the outer surface of the limiting box, and a moving block is fixedly installed on one side of the outer surface of the two compression springs. A hinge rod is hingedly installed inside the moving block, and one end of the hinge rod is hingedly connected to the pressure plate.

[0011] As a preferred embodiment, a base plate is fixedly installed at the bottom of the limiting box, and two threaded grooves are formed inside the base plate.

[0012] As a preferred embodiment, the assembly equipment body includes an assembly table, an assembly rail is fixedly installed on the top of the assembly table, a pneumatic cylinder is fixedly installed on one side of the outer surface of the assembly rail, a push plate is fixedly installed at one end of the pneumatic rod of the pneumatic cylinder, and four support legs are fixedly installed at the bottom of the assembly table.

[0013] As a preferred embodiment, a second pneumatic cylinder is fixedly installed on one side of the outer surface of the assembly rail, and a second push plate is fixedly installed on one end of the pneumatic rod of the second pneumatic cylinder.

[0014] As a preferred embodiment, a side plate is fixedly installed on the top of the assembly table, and a pneumatic cylinder three is fixedly installed on one side of the outer surface of the side plate. A push rod is fixedly installed on one end of the pneumatic rod of the pneumatic cylinder three.

[0015] As a preferred embodiment, an automatic assembly arm one is fixedly installed on one side of the top of the outer surface of the assembly table, an automatic assembly arm two is fixedly installed on one side of the top of the outer surface of the assembly table, a fixing ring is fixedly installed at the bottom of the assembly table, a servo motor is fixedly installed inside the fixing ring, a turntable is fixedly sleeved at one end of the output shaft of the servo motor, and a push hole is opened inside the turntable, the push hole being the same size as the push rod.

[0016] An electromagnetic expansion valve for new energy vehicles includes a valve body connected to an expansion valve housing. A power head is provided on the top of the valve body. An upper transmission rod is provided inside the valve body. A lower transmission rod is fixedly installed at the bottom of the upper transmission rod. A valve core is provided at the bottom of the lower transmission rod. An adjusting spring is fixedly installed at the bottom of the valve core. A sealing ring is provided inside the valve body. An adjusting screw is provided inside the valve body.

[0017] (III) Beneficial Effects

[0018] Compared with the prior art, the present invention provides an electromagnetic expansion valve for new energy vehicles and its automatic assembly equipment, which has the following beneficial effects:

[0019] 1. In this invention, through the opening and closing structure, after the magnetic ring is energized, the rotor is rotated by magnetic force, thereby driving the bidirectional lead screw to rotate. Since the threads on both sides of the bidirectional lead screw are opposite, the two threaded plates move in opposite directions at the same time. Due to the hinge of the second hinge rod, when the threaded plate moves, it can drive the two second hinge rods to move in opposite directions, thereby driving the connecting plate to rotate. Thus, the valve hole can be rotated to the direction of the baffle. At this time, the inlet column and the outlet column are connected, and the valve body is opened. This structure drives the connecting plate to rotate through the bidirectional lead screw, avoiding the poor rotation effect in traditional devices, improving the torque during opening and closing, thereby achieving the purpose of smooth opening and closing.

[0020] 2. In this invention, through the shock-absorbing structure, when a new energy vehicle is driving and bumps occur, the pressure plate presses down on the spring column. At the same time, due to the hinge of the first hinge rod, the moving blocks on both sides are driven to squeeze and compress the spring outward, thereby improving the overall shock-absorbing effect of the device, reducing the force and impact on the device, and improving the service life of the device.

[0021] 3. In this invention, when assembling and loading the expansion valve housing via the assembly table, the pre-formed expansion valve housing is placed into the notch of the assembly rail. At this time, the pneumatic cylinder one drives the push plate one to push the expansion valve housing forward. The automatic assembly arm one performs the first assembly drilling. Then, the pneumatic cylinder two drives the push plate two to push the pre-formed expansion valve housing to the position of the automatic assembly arm two. The automatic assembly arm two drives the pre-formed expansion valve housing for the second assembly. After that, the push plate two pushes the pre-formed expansion valve housing into the turntable. At this time, the servo motor drives the turntable to rotate to the outlet of the assembly rail. The pneumatic cylinder three drives the push rod to push the expansion valve housing for unloading, thereby achieving the purpose of automatic loading and unloading. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the assembly equipment and valve body structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the assembly equipment structure of the present invention;

[0024] Figure 3 This is a side view of the assembly equipment of the present invention;

[0025] Figure 4 This is a schematic diagram of the valve body structure of the present invention;

[0026] Figure 5 This is a schematic diagram of the shock-absorbing structure of the present invention;

[0027] Figure 6 This is a schematic diagram of the internal cross-sectional structure of the valve body of the present invention;

[0028] Figure 7 This is a schematic cross-sectional view of the internal structure of the valve box of the present invention;

[0029] Figure 8 This is a schematic diagram of the internal structure of the valve box of the present invention;

[0030] Figure 9 This is a schematic diagram of the disassembly structure of the internal parts of the valve box of the present invention.

[0031] In the diagram: 1. Expansion valve housing; 2. Assembly equipment body; 3. Assembly table; 4. Assembly rail; 5. Pneumatic cylinder one; 51. Push plate one; 6. Pneumatic cylinder two; 61. Push plate two; 7. Side plate; 71. Pneumatic cylinder three; 72. Push rod; 8. Automatic assembly arm one; 9. Automatic assembly arm two; 10. Fixing ring; 101. Servo motor; 102. Turntable; 103. Push hole; 11. Support leg; 12. Valve box; 13. Magnetic box; 14. Support rod one; 15. Shock absorption structure; 151. Pressure plate; 152. Spring column; 153. Limit box; 154. Limiting post; 155. Compression spring; 156. Moving block; 157. Hinge rod one; 158. Base plate; 16. Support post; 17. Magnetic ring; 18. Rotor; 19. Connecting hole; 20. Opening and closing structure; 201. Support plate; 202. Bidirectional lead screw; 203. Threaded plate; 204. Hinge seat; 205. Support rod two; 206. Rotating shaft; 207. Connecting disc; 208. Hinge rod two; 209. Valve column; 2010. Baffle; 2011. Valve hole; 21. Barrier plate; 22. Inlet post; 23. Outlet post. Detailed Implementation

[0032] The present invention will be further described and illustrated below with reference to specific embodiments and the accompanying drawings:

[0033] Please see Figure 1-9This invention relates to an automatic assembly equipment for electromagnetic expansion valves in new energy vehicles, comprising an expansion valve housing 1 and an assembly equipment body 2. The expansion valve housing 1 includes a valve box 12, a magnetic box 13 fixedly mounted on the top of the valve box 12, a support column 16 fixedly mounted inside the magnetic box 13, a magnetic ring 17 fixedly sleeved on the outer surface of the support column 16, and a rotor 18 fixedly sleeved inside the support column 16. A connection hole 19 is provided on the top of the valve box 12, a baffle plate 21 is fixedly mounted inside the valve box 12, and an opening and closing structure 20 is fixedly mounted inside the valve box 12. The opening and closing structure 20 includes two support plates 201, a bidirectional lead screw 202 fixedly sleeved inside the two support plates 201, the top of the bidirectional lead screw 202 being fixedly connected to the rotor 18, and two threaded plates 203 being threadedly mounted on the outer surface of the bidirectional lead screw 202. One side of the outer surface of the two threaded plates 203 is fixed. Support rod 205 is installed. Hinges 204 are fixedly installed on one side of the outer surface of the two support rods 205. The support rod 205 fixedly installed on the upper threaded plate 203 is movably installed with the bottom threaded plate 203. The support rod 205 fixedly installed on the bottom threaded plate 203 is movably installed with the top threaded plate 203. A rotating shaft 206 is fixedly sleeved inside the valve box 12. A connecting plate 207 is fixedly sleeved at one end of the rotating shaft 206. Hinges 208 are hingedly installed on one side of the outer surface of the two hingees 204. One end of the two hingees 208 is fixedly sleeved with the connecting plate 207. A valve column 209 is fixedly installed on one side of the outer surface of the connecting plate 207. The valve column 209 passes through the baffle plate 21. Support rod 14 is hingedly installed on both sides of the outer surface of the valve box 12. A shock-absorbing structure 15 is fixedly installed at the bottom of the two support rods 14.

[0034] Please see Figure 8-9 The present invention comprises: a baffle 2010 fixedly installed inside the valve box 12, the baffle 2010 being tightly attached to the valve column 209; a valve hole 2011 being opened on one side of the outer surface of the valve column 209; an inlet column 22 being fixedly installed on one side of the outer surface of the valve box 12, the inlet column 22 being connected to the baffle 2010; and an outlet column 23 being fixedly installed on one side of the outer surface of the valve box 12, the outlet column 23 being connected to the valve column 209. Two damping structures 15 include a pressure plate 151, spring columns 152 being fixedly installed on both sides of the bottom of the pressure plate 151; a limit box 153 being fixedly installed at the bottom of the spring columns 152; and a limit column 154 being fixedly installed inside the limit box 153. Compression springs 155 are fixedly installed on both sides of the outer surface of the limit box 153; a moving block 156 is fixedly installed on one side of the outer surface of the two compression springs 155; and a hinge rod 157 is hingedly installed inside the moving block 156, one end of which is hingedly connected to the pressure plate 151. The bottom of the limit box 153 is fixedly installed with a base plate 158, and the inside of the base plate 158 has two threaded grooves.

[0035] Because the threads on both sides of the bidirectional lead screw 202 are opposite, the two threaded plates 203 move in opposite directions simultaneously. Due to the hinge of the second hinge rod 208, when the threaded plate 203 moves, it can drive the two hinge rods 208 to move in opposite directions, thereby driving the connecting plate 207 to rotate. This allows the valve hole 2011 to rotate to the direction of the baffle 2010. At this time, the inlet column 22 and the outlet column 23 are connected, and the valve body is open. This structure drives the connecting plate 207 to rotate through the bidirectional lead screw 202. When a bump occurs, the pressure plate 151 presses down on the spring column 152. At the same time, due to the hinge of the first hinge rod 157, the moving blocks 156 on both sides squeeze the spring 155 outward, thereby improving the overall shock absorption effect of the device.

[0036] Please see Figure 1-3 The present invention comprises: an assembly equipment body 2 including an assembly table 3; an assembly rail 4 fixedly mounted on the top of the assembly table 3; a pneumatic cylinder 5 fixedly mounted on one side of the outer surface of the assembly rail 4; a push plate 51 fixedly mounted on one end of the pneumatic rod of the pneumatic cylinder 5; and four support legs 11 fixedly mounted on the bottom of the assembly table 3. A second pneumatic cylinder 6 fixedly mounted on one side of the outer surface of the assembly rail 4; a push plate 61 fixedly mounted on one end of the pneumatic rod of the second pneumatic cylinder 6. A side plate 7 fixedly mounted on the top of the assembly table 3; a third pneumatic cylinder 71 fixedly mounted on one side of the outer surface of the side plate 7; and a push rod 72 fixedly mounted on one end of the pneumatic rod of the third pneumatic cylinder 71. An automatic assembly arm 8 and an automatic assembly arm 9 are fixedly mounted on the top side of the outer surface of the assembly table 3. A fixing ring 10 is fixedly installed at the bottom of the assembly table 3. A servo motor 101 is fixedly installed inside the fixing ring 10. A turntable 102 is fixedly sleeved at one end of the output shaft of the servo motor 101. A push hole 103 is opened inside the turntable 102. The push hole 103 is the same size as the push rod 72.

[0037] An electromagnetic expansion valve for new energy vehicles includes a valve body connected to an expansion valve housing 1. A power head is provided on the top of the valve body, an upper transmission rod is provided inside the valve body, a lower transmission rod is fixedly installed at the bottom of the upper transmission rod, a valve core is provided at the bottom of the lower transmission rod, an adjusting spring is fixedly installed at the bottom of the valve core, a sealing ring is provided inside the valve body, and an adjusting screw is provided inside the valve body.

[0038] The pre-formed expansion valve housing 1 is inserted through the notch of assembly rail 4. At this time, the pneumatic cylinder 5 drives the push plate 51 to push the expansion valve housing 1 forward. The automatic assembly arm 8 performs the first assembly drilling. Then, the pneumatic cylinder 6 drives the push plate 61 to push the pre-formed expansion valve housing 1 to the position of the automatic assembly arm 9. The automatic assembly arm 9 drives the pre-formed expansion valve housing 1 for the second assembly. After that, the push plate 61 pushes the pre-formed expansion valve housing 1 into the turntable 102. At this time, the servo motor 101 drives the turntable 102 to rotate to the outlet of assembly rail 4. The pneumatic cylinder 71 drives the push rod 72 to push the expansion valve housing 1 for unloading.

[0039] The working principle of this invention is as follows: First, during the assembly and loading of the expansion valve housing 1, the pre-formed part of the expansion valve housing 1 is inserted through the notch of the assembly rail 4. At this time, the pneumatic cylinder 5 drives the push plate 51 to push the expansion valve housing 1 forward. The automatic assembly arm 8 performs the first assembly drilling. Then, the pneumatic cylinder 6 drives the push plate 61 to push the pre-formed part of the expansion valve housing 1 to the position of the automatic assembly arm 9. The automatic assembly arm 9 then performs the second assembly of the pre-formed part of the expansion valve housing 1. Afterward, the push plate 61 pushes the pre-formed part of the expansion valve housing 1 into the turntable 102. At this time, the servo motor 101 drives the turntable 102 to rotate to the outlet of the assembly rail 4. The pneumatic cylinder 71 drives the push rod 72 to push the expansion valve housing 1 for unloading. Then, when the device is in use, After the magnetic ring 17 is energized, the rotor 18 rotates due to magnetic force, which in turn drives the bidirectional lead screw 202 to rotate. Since the threads on both sides of the bidirectional lead screw 202 are opposite, the two threaded plates 203 move in opposite directions at the same time. Due to the hinge of the second hinge rod 208, when the threaded plate 203 moves, it can drive the two hinge rods 208 to move in opposite directions, which can drive the connecting plate 207 to rotate. Therefore, the valve hole 2011 can be rotated to the direction of the baffle 2010. At this time, the inlet column 22 and the outlet column 23 are connected, and the valve body is opened. This structure drives the connecting plate 207 to rotate through the bidirectional lead screw 202. Finally, when a bump occurs, the pressure plate 151 presses down on the spring column 152. At the same time, due to the hinge of the first hinge rod 157, the moving blocks 156 on both sides are driven to squeeze the compression spring 155 outward, which can improve the overall shock absorption effect of the device.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. An automatic assembly equipment for electromagnetic expansion valves in new energy vehicles, comprising an expansion valve housing (1) and an assembly equipment body (2), characterized in that... The expansion valve housing (1) includes a valve box (12), a magnetic box (13) is fixedly installed on the top of the valve box (12), a support column (16) is fixedly installed inside the magnetic box (13), a magnetic ring (17) is fixedly sleeved on the outer surface of the support column (16), a rotor (18) is fixedly sleeved inside the support column (16), a connection hole (19) is opened on the top of the valve box (12), and a baffle plate (21) is fixedly installed inside the valve box (12). 2) An opening and closing structure (20) is fixedly installed inside the rotor (18). The opening and closing structure (20) includes two support plates (201). A bidirectional lead screw (202) is fixedly sleeved inside the two support plates (201). The top of the bidirectional lead screw (202) is fixedly connected to the rotor (18). Two threaded plates (203) are threaded on the outer surface of the bidirectional lead screw (202). A support rod (205) is fixedly installed on one side of the outer surface of the two threaded plates (203). A hinge seat (204) is fixedly installed on one side of the outer surface of the second support rod (205). The second support rod (205) fixedly installed on the upper threaded plate (203) and the threaded plate (203) at the bottom are movably installed. The second support rod (205) fixedly installed on the bottom threaded plate (203) and the threaded plate (203) at the top are movably installed. A rotating shaft (206) is fixedly sleeved inside the valve box (12). A connecting plate (207) is fixedly sleeved at one end of the rotating shaft (206). A hinge rod (208) is hinged to one side of the outer surface of the hinge seat (204). One end of the two hinge rods (208) is fixedly sleeved with the connecting plate (207). A valve column (209) is fixedly installed on one side of the outer surface of the connecting plate (207). The valve column (209) passes through the barrier plate (21). Support rods (14) are hinged to both sides of the outer surface of the valve box (12). A shock-absorbing structure (15) is fixedly installed at the bottom of the two support rods (14).

2. The automatic assembly equipment for electromagnetic expansion valves of new energy vehicles according to claim 1, characterized in that... A baffle (2010) is fixedly installed inside the valve box (12). The baffle (2010) is in close contact with the valve column (209). A valve hole (2011) is opened on one side of the outer surface of the valve column (209). An inlet column (22) is fixedly installed on one side of the outer surface of the valve box (12). The inlet column (22) is connected to the baffle (2010). An outlet column (23) is fixedly installed on one side of the outer surface of the valve box (12). The outlet column (23) is connected to the valve column (209).

3. The automatic assembly equipment for electromagnetic expansion valves of new energy vehicles according to claim 1, characterized in that... The two shock-absorbing structures (15) include a pressure plate (151), and spring columns (152) are fixedly installed on both sides of the bottom of the pressure plate (151). A limit box (153) is fixedly installed at the bottom of the spring column (152), and a limit column (154) is fixedly installed inside the limit box (153).

4. The automatic assembly equipment for electromagnetic expansion valves of new energy vehicles according to claim 3, characterized in that... Compression springs (155) are fixedly installed on both sides of the outer surface of the limiting box (153). A moving block (156) is fixedly installed on one side of the outer surface of the two compression springs (155). A hinge rod (157) is hingedly installed inside the moving block (156). One end of the hinge rod (157) is hingedly connected to the pressure plate (151).

5. An automatic assembly equipment for electromagnetic expansion valves in new energy vehicles according to claim 4, characterized in that... The bottom of the limiting box (153) is fixedly installed with a base plate (158), and the base plate (158) has two threaded grooves inside.

6. The automatic assembly equipment for electromagnetic expansion valves of new energy vehicles according to claim 1, characterized in that... The assembly equipment body (2) includes an assembly table (3), an assembly rail (4) is fixedly installed on the top of the assembly table (3), a pneumatic cylinder (5) is fixedly installed on one side of the outer surface of the assembly rail (4), a push plate (51) is fixedly installed on one end of the pneumatic rod of the pneumatic cylinder (5), and four support legs (11) are fixedly installed on the bottom of the assembly table (3).

7. An automatic assembly equipment for electromagnetic expansion valves in new energy vehicles according to claim 6, characterized in that... A pneumatic cylinder (6) is fixedly installed on one side of the outer surface of the assembly rail (4), and a push plate (61) is fixedly installed on one end of the pneumatic rod of the pneumatic cylinder (6).

8. An automatic assembly equipment for electromagnetic expansion valves in new energy vehicles according to claim 6, characterized in that... The top of the assembly table (3) is fixedly installed with a side plate (7), and a pneumatic cylinder (71) is fixedly installed on one side of the outer surface of the side plate (7). A push rod (72) is fixedly installed on one end of the pneumatic rod of the pneumatic cylinder (71).

9. An automatic assembly equipment for electromagnetic expansion valves in new energy vehicles according to claim 6, characterized in that... An automatic assembly arm (8) is fixedly installed on the top side of the outer surface of the assembly table (3), and an automatic assembly arm (9) is fixedly installed on the top side of the outer surface of the assembly table (3). A fixing ring (10) is fixedly installed at the bottom of the assembly table (3). A servo motor (101) is fixedly installed inside the fixing ring (10). A turntable (102) is fixedly sleeved at one end of the output shaft of the servo motor (101). A push hole (103) is opened inside the turntable (102). The push hole (103) is the same size as the push rod (72).

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