A feeding and discharging mechanism for piston tube expanding and stamping

Abstract

The application discloses a feeding and discharging mechanism for piston pipe expanding and stamping, relates to the field of pipe clamping and conveying, and comprises a machine table, an adjusting plate arranged above the machine table, a lifting mechanism and a horizontal moving mechanism arranged below the machine table, a rotary cylinder installed above the adjusting plate, a rotating plate connected to the output rotating shaft of the rotary cylinder, horizontally distributed first telescopic cylinders installed above the rotating plate, a connecting plate fixed above the first telescopic cylinders, second telescopic cylinders installed above the connecting plate, a vertical plate fixed to the end of the piston rod of the first telescopic cylinders, first pneumatic clamping jaws fixed to the vertical plate, and second pneumatic clamping jaws installed at the end of the piston rod of the second telescopic cylinders. The device can adjust the clamping position through the lifting mechanism and the horizontal moving mechanism, then drive the first pneumatic clamping jaws and the second pneumatic clamping jaws to rotate simultaneously through the rotary cylinder, realize the effect of synchronous feeding and discharging, orderly feeding and discharging, and has a high degree of automation, and is suitable for assembly line operation.

Description

Technical Field

[0001] This application relates to the field of pipe clamping and conveying, and in particular to a loading and unloading mechanism for piston tube expansion and stamping. Background Technology

[0002] Piston tube expansion stamping is a processing method that uses stamping equipment and dies to apply pressure to tubes, causing plastic deformation to increase their diameter. This process controls parameters such as pressure and speed to ensure uniform deformation of the inner wall of the tube, achieving increased diameter and reduced wall thickness. Its core advantages lie in high processing precision, high production efficiency, and high material utilization, and it is widely used in the automotive, aerospace, and other fields. The process flow encompasses tube preparation, die design, equipment debugging, parameter setting, stamping, and post-processing, ensuring stable and reliable finished product quality.

[0003] For example, the automatic loading and unloading device for a pipe expander (patent number CN111659812B) has the following shortcomings in actual use:

[0004] The above-mentioned device can place multiple rows of pipes that need to be expanded through the upper and lower sliding plates. The material changing mechanism and clamping mechanism can quickly change the material and push the finished expanded pipe from the discharge plate. However, it requires operators or robotic arms to place the pipes on the upper or lower sliding plates. It cannot directly load and unload the pipes between the pipe conveying equipment and the processing equipment, which is inconvenient to use. Summary of the Invention

[0005] In order to improve the technical problem that the conveying equipment and processing equipment of pipes cannot be directly loaded and unloaded, this application provides a loading and unloading mechanism for piston tube expansion and stamping.

[0006] The technical solution provided in this application for a piston tube expansion stamping loading and unloading mechanism is as follows:

[0007] A loading and unloading mechanism for piston tube expansion stamping includes a machine base. An adjustment plate is provided above the machine base, and a lifting mechanism and a lateral movement mechanism for adjusting the position of the adjustment plate are provided below the machine base. A rotary cylinder is installed above the adjustment plate, and a rotating plate is connected to the output shaft of the rotary cylinder. A first telescopic cylinder is installed above the rotating plate and distributed laterally. A connecting plate is fixed above the first telescopic cylinder, and a second telescopic cylinder is installed above the connecting plate. A vertical plate is fixed to the end of the piston rod of the first telescopic cylinder, and a first pneumatic gripper is fixed to the vertical plate. A second pneumatic gripper is installed to the end of the piston rod of the second telescopic cylinder, and clamping plates are installed on the grippers of both the first and second pneumatic grippers.

[0008] By adopting the above technical solution, the clamping position can be adjusted by the lifting mechanism and the lateral movement mechanism. Then, the rotary cylinder drives the first pneumatic gripper and the second pneumatic gripper to rotate simultaneously. The first telescopic cylinder drives the first pneumatic gripper to extend forward and clamp the pipe conveyed by the conveying mechanism. The second telescopic cylinder drives the second pneumatic gripper to extend forward and clamp the processed pipe on the processing equipment. After rotation, the first pneumatic gripper places the pipe in the processing position, and the second pneumatic gripper moves the pipe to the discharge position, achieving the effect of synchronous loading and unloading.

[0009] Preferably, the machine tool has an installation port in the middle, and the lifting mechanism includes a fixed plate fixed to one side of the installation port. A first slide rail is provided on the fixed plate, and a lifting plate is slidably provided on the first slide rail. A horizontal plate is fixed to the upper end of the lifting plate, and an adjusting plate is provided on the horizontal plate. A lifting cylinder is installed on the fixed plate, and the piston rod end of the lifting cylinder is fixed to the bottom of the horizontal plate.

[0010] By adopting the above technical solution, the retraction of the lifting cylinder can drive the horizontal plate to move up and down, thereby changing the clamping height. It is suitable for processing equipment of different heights, and the up and down sliding through the first slide rail can improve the stability of the sliding.

[0011] Preferably, the transverse movement mechanism includes a second slide rail fixed to the horizontal plate, an adjusting plate slidably disposed above the second slide rail, two symmetrically distributed reinforcing plates disposed below the horizontal plate, and a square groove provided on the horizontal plate. A connecting member is fixed below the adjusting plate and passes through the square groove. A transverse movement cylinder is disposed between the connecting member and one of the reinforcing plates, and the transverse movement cylinder is parallel to the second slide rail.

[0012] By adopting the above technical solution, the transverse cylinder can drive the adjusting plate to move laterally along the second slide rail, further adjusting the clamping position. In conjunction with the lifting mechanism, it is easier to fix the position of the machine when installing the equipment. Then, it can be adjusted again through the lifting mechanism and the transverse mechanism, making assembly more convenient.

[0013] Preferably, a limit block is fixed to the side end of the adjustment plate.

[0014] By adopting the above technical solution, the limit block can prevent the adjusting plate from descending excessively and causing a collision between the machine and the first telescopic cylinder.

[0015] Preferably, a U-shaped frame is fixed on both the rotating plate and the connecting plate. The first telescopic cylinder and the second telescopic cylinder are both fixed in the middle position of the U-shaped frame. Two symmetrically distributed guide rods are slidably arranged on both sides of the U-shaped frame. One end of the guide rod is connected to a U-shaped plate. The other end of the guide rod located on both sides of the first telescopic cylinder is connected to the piston rod end of the first telescopic cylinder and is connected to a mounting plate. The other end of the guide rod located on both sides of the second telescopic cylinder is connected to the piston rod end of the second telescopic cylinder and is connected to a vertical plate.

[0016] By adopting the above technical solution, the stability of the first and second telescopic cylinders during extension and retraction is improved by the guide rod, the accuracy of workpiece placement and clamping position is improved, and the workpiece is prevented from falling during transfer. In addition, the U-shaped frame can facilitate the positioning and installation of the first and second telescopic cylinders.

[0017] Preferably, the rotating plate has several circumferentially distributed first mounting holes on its side end, and two arc-shaped limiting plates are connected to the side end of the rotating plate by bolts. The arc-shaped limiting plates have positioning holes aligned with the first mounting holes. A stop block is provided on the outer side of the arc-shaped limiting plates. A fixing rod is fixed on the upper surface of the rotating cylinder, and a top rod is provided at both ends of the fixing rod.

[0018] By adopting the above technical solution, the arc-shaped limiting plate can be installed on different first mounting holes. When the stop block abuts against the top rod during the rotation of the rotary cylinder, the rotation angle can be limited. In addition, by adjusting the angle between the first telescopic cylinder and the second telescopic cylinder, automatic loading and unloading at different angles can be achieved.

[0019] Preferably, the stop block has a through hole, and a threaded rod is inserted into the through hole. Both ends of the threaded rod are threaded with fixing nuts, and the fixing nuts abut against both sides of the stop block.

[0020] By adopting the above technical solution, the position of the threaded rod can be adjusted by adjusting the position of the fixing nut. When limiting the angle, the rotation angle of the rotary cylinder can be finely adjusted by adjusting the position of the threaded rod, thereby improving the accuracy of the angle adjustment.

[0021] Preferably, the connecting plate has a plurality of second mounting holes, a circular plate is provided above the connecting plate, the second telescopic cylinder is provided on the circular plate, the circular plate has a plurality of arc-shaped slots, and an embedding slot is provided above the arc-shaped slots. The circular plate is fixed to the connecting plate by a washer bolt, and the washer bolt passes through the arc-shaped slot and is threadedly connected to the second mounting hole, and the bolt head of the washer bolt is located inside the embedding slot.

[0022] By adopting the above technical solution, the circular plate is pressed and fixed by the gasket bolts. Under the action of the arc-shaped groove, the circular plate can be angled to adapt to different cylinder angles. Moreover, the bolt head is located in the groove and the height is lower than the surface of the circular plate, so it will not affect the installation stability of the second telescopic cylinder.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. The clamping position is adjusted by the lifting mechanism and the traversing mechanism. Then, the rotary cylinder drives the first pneumatic gripper and the second pneumatic gripper to rotate simultaneously, so as to achieve the effect of synchronous loading and unloading. The device can be directly installed between the conveying equipment and the processing equipment for orderly loading and unloading. No additional steps are required from the operator. It has a high degree of automation and is suitable for assembly line operation.

[0025] 2. The lifting mechanism drives the adjusting plate to move up and down, and the horizontal movement mechanism drives the adjusting plate to move left and right. When installing the device, only one clamping position needs to be determined to fix the machine. Then, by adjustment, the clamping and movement accuracy can be improved, and the assembly is more convenient. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall isometric structure of this application;

[0027] Figure 2 This is a schematic diagram of the upper end of the adjusting plate in this application;

[0028] Figure 3 This is a schematic diagram of the structure of the lower end of the adjustment plate in this application;

[0029] Figure 4 This is a partial structural diagram of this application;

[0030] Figure 5 This is a schematic diagram of the rotary cylinder in this application;

[0031] Figure 6 This is a schematic diagram showing the disassembled structure of the connecting plate and the circular plate in this application.

[0032] Reference numerals: 1. Machine base; 2. Adjusting plate; 3. Rotary cylinder; 4. First telescopic cylinder; 5. Connecting plate; 6. Second telescopic cylinder; 7. Vertical plate; 8. First pneumatic gripper; 9. Second pneumatic gripper; 10. Clamping plate; 11. Mounting port; 12. Fixing plate; 13. First slide rail; 14. Lifting plate; 15. Horizontal plate; 16. Lifting cylinder; 17. Second slide rail; 18. Reinforcing plate; 19. Square groove; 20. Lateral movement cylinder; 21. Limiting block; 22. U-shaped frame; 23. Guide rod; 24. U-shaped plate; 25. Mounting plate; 26. Rotating plate; 27. First mounting hole; 28. Arc-shaped limiting plate; 29. ​​Positioning hole; 30. Stop block; 31. Fixing rod; 32. Top rod; 33. Threaded rod; 34. Second mounting hole; 35. Round plate; 36. Arc-shaped groove; 37. Embedded groove. Detailed Implementation

[0033] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0034] This application discloses a loading and unloading mechanism for piston tube expansion stamping.

[0035] Example 1

[0036] Reference Figures 1-4 A loading and unloading mechanism for piston tube expansion stamping includes a machine base 1. An adjustable adjustment plate 2 is mounted above the machine base, and a lifting mechanism and a lateral movement mechanism are located below the machine base 1. These two mechanisms work together to precisely control the spatial position of the adjustment plate 2. A rotary cylinder 3 is mounted on the top of the adjustment plate 2, and its output shaft is connected to a rotating plate 26, driving the rotating plate 26 to rotate. A first telescopic cylinder 4 is horizontally fixed on the rotating plate 26, and its top is connected to a second telescopic cylinder 6 via a connecting plate 5. A vertical plate 7 is mounted on the piston rod end of the first telescopic cylinder 4, and a first pneumatic gripper 8 is fixed on the vertical plate 7. A second pneumatic gripper 9 is directly mounted on the piston rod end of the second telescopic cylinder 6. Both pneumatic grippers are equipped with clamping plates 10 to ensure stability during gripping.

[0037] With the above setup, the lifting mechanism and the traversing mechanism work together to adjust the gripping position and ensure the accuracy of the gripping action. Then, the rotary cylinder 3 starts, driving the first pneumatic gripper 8 and the second pneumatic gripper 9 to rotate synchronously to a designated angle. At this time, the first telescopic cylinder 4 drives the first pneumatic gripper 8 to extend forward, accurately gripping the pipe to be processed from the conveying mechanism; simultaneously, the second telescopic cylinder 6 controls the second pneumatic gripper 9 to extend forward, gripping the completed pipe on the processing equipment. The rotary cylinder 3 operates again, causing the two pneumatic grippers to rotate to a preset position: the first pneumatic gripper 8 precisely places the pipe to be processed at the processing station, while the second pneumatic gripper 9 transfers the finished pipe to the discharge area, thus achieving efficient synchronous loading and unloading operations.

[0038] Reference Figure 2 and Figure 3 The machine base 1 has a rectangular mounting opening 11 in the middle. The lifting mechanism is mounted on one side of the mounting opening 11 via a fixed plate 12. A first slide rail 13 is arranged longitudinally on the fixed plate 12. The lifting plate 14 is slidably engaged with the first slide rail 13 via a slider. A horizontal plate 15 is fixed to its top, and an adjusting plate 2 is mounted on top of the horizontal plate 15. A lifting cylinder 16 is mounted on the fixed plate 12, and its piston rod end is connected to the bottom of the horizontal plate 15. The cylinder drives the horizontal plate 15 to rise and fall along the first slide rail 13 through telescopic movement. The transverse movement mechanism adopts a double reinforcing plate 18 structure. The two reinforcing plates 18 are symmetrically fixed to the bottom of the horizontal plate 15, and a square groove 19 is opened in the center of the horizontal plate 15 as a transverse movement channel. The bottom of the adjusting plate 2 passes through the square groove 19 through a connector and is connected to the piston rod end of the transverse movement cylinder 20 on the right reinforcing plate 18. The transverse movement cylinder 20 is parallel to the second slide rail 17 arranged laterally. A limiting block 21 is provided on the side of the adjusting plate 2.

[0039] With the above configuration, the lifting cylinder 16 drives the horizontal plate 15 to move vertically up and down along the first slide rail 13 through the telescopic movement of the piston rod, making the clamping assembly adaptable to processing equipment of different heights. The guide structure formed by the first slide rail 13 and the slider effectively improves the stability of the lifting process and prevents movement deviation. The limiting block 21 on the side of the adjusting plate 2 forms a mechanical interlock with the structure of the machine base 1. When the adjusting plate 2 descends to the limit position, the limiting block 21 will touch the preset stop surface of the machine base 1 to prevent the adjusting plate 2 from moving too far down and causing the machine base 1 to collide with the first telescopic cylinder 4. The lateral movement cylinder 20 pushes the connecting piece at the bottom of the adjusting plate 2 to make it slide horizontally along the second slide rail 17, realizing the lateral adjustment of the clamping position. This composite motion design of lifting and lateral movement allows the machine base 1 to be roughly positioned first during the installation stage, and then the cylinder drive mechanism can be used for precise secondary adjustment, which simplifies the assembly process and improves the adaptability of the equipment to different working conditions.

[0040] refer to Figure 4 Both the rotating plate 26 and the connecting plate 5 are equipped with U-shaped frames 22. The first telescopic cylinder 4 and the second telescopic cylinder 6 are respectively fixed to the center position of the corresponding U-shaped frame 22. Guide rods 23 are slidably arranged on both sides of each U-shaped frame 22. For the first telescopic cylinder 4, the rear ends of its two guide rods 23 are rigidly connected to the piston rod end through the mounting plate 25, and the front ends are fixed to the U-shaped plate 24. The guide rods 23 of the second telescopic cylinder 6 adopt a similar structure, with the rear end connected to the vertical plate 7 and the front end also converging on another U-shaped plate 24.

[0041] Through the above settings, the extension and retraction motion of the cylinder piston rod is transformed into a stable linear motion through the linkage structure of the guide rod 23 and the U-shaped plate 24, effectively eliminating radial wobble during the extension and retraction process and improving the positioning accuracy of the gripper in picking up and placing pipes.

[0042] The implementation principle of this embodiment is as follows:

[0043] The retraction of the lifting cylinder 16 can drive the horizontal plate 15 to move up and down, and the lateral movement cylinder 20 can drive the adjusting plate 2 to move laterally along the second slide rail 17 to achieve multi-directional adjustment. After the device is installed, the rotary cylinder 3 drives the first pneumatic gripper 8 and the second pneumatic gripper 9 to rotate simultaneously. In conjunction with the first telescopic cylinder 4 and the second telescopic cylinder 6, the synchronous loading and unloading effect is achieved. The device can be directly installed between the conveying equipment and the processing equipment for orderly loading and unloading. It has a high degree of automation and is suitable for assembly line operations.

[0044] Example 2

[0045] refer to Figure 5 and Figure 6Multiple first mounting holes 27 are evenly distributed along the circumference of the side of the rotating plate 26. Two sets of arc-shaped limiting plates 28 are symmetrically fixed to both sides of the rotating plate 26 by bolts passing through the first mounting holes 27 and positioning holes 29. Each arc-shaped limiting plate 28 has a stop 30 on its outer edge. The top of the rotating cylinder 3 is connected to two parallel push rods 32 by a fixing rod 31 to form a gate-shaped limiting frame. A through hole is opened in the center of the stop 30. After the threaded rod 33 passes through the through hole laterally, both ends are locked with fixing nuts, so that the threaded rod 33 can be axially finely adjusted. When the rotating cylinder 3 drives the rotating plate 26 to rotate, the threaded rod 33 and the push rod 32 form a mechanical limit. By adjusting the fixing nuts, the rotation angle range of the rotating plate 26 can be further precisely controlled to ensure that the pneumatic gripper switches accurately between preset positions.

[0046] With the above settings, the arc-shaped limiting plate 28 can be installed using different first mounting holes 27. During rotation, the stop block 30 contacts the push rod 32 to achieve basic limiting. By adjusting the installation angle of the two telescopic cylinders, the loading and unloading requirements of different inclined positions can be met. Loosening the fixing nut and finely adjusting the position of the threaded rod 33 can change the contact point between the stop block 30 and the push rod 32, achieving further precision adjustment of the rotation angle and ensuring accurate positioning of the gripper.

[0047] refer to Figure 6 Multiple sets of second mounting holes 34 are evenly distributed on the connecting plate 5. The circular plate 35 is fixed to the top of the connecting plate 5 by washer bolts. Multiple concentric arc-shaped slots 36 are formed on the surface of the circular plate 35, and each slot has a matching insertion slot 37 at the top. During installation, the washer bolts pass through the arc-shaped slots 36 and are threaded into the second mounting holes 34. The bolt heads are completely embedded in the insertion slots 37, achieving a protrusion-free fixation of the circular plate 35.

[0048] With the above configuration, the circular plate 35 is locked and fixed to the connecting plate 5 by passing through the arc-shaped slot 36 with a washer bolt. The arc-shaped slot 36 provides angle adjustment space for the circular plate 35, which can adapt to the cylinder installation angle requirements under different working conditions. The bolt head is fully embedded in the embedding slot 37 on the surface of the circular plate 35, and its top height is lower than the upper surface of the circular plate 35, ensuring that the second telescopic cylinder 6 is completely in contact with the surface of the circular plate 35 when installed, effectively eliminating assembly interference and improving the overall structural stability.

[0049] The implementation principle of this embodiment is as follows:

[0050] The arc-shaped limiting plate 28 is installed through different first mounting holes 27. During rotation, the stop block 30 and the top rod 32 form a basic limiting position. By adjusting the included angle of the two telescopic cylinders, automatic loading and unloading at multiple angles can be achieved. The threaded rod 33 can be precisely controlled by finely adjusting its axial position through the fixing nut. The arc-shaped groove 36 of the circular plate 35 supports angle pre-adjustment, and the embedded groove 37 accommodates the bolt head, ensuring that the installation of the second telescopic cylinder 6 is interference-free and improving structural stability.

[0051] In summary, this device can drive the first pneumatic gripper 8 and the second pneumatic gripper 9 to rotate simultaneously via the rotary cylinder 3, achieving synchronous loading and unloading. It can be directly installed between conveying equipment and processing equipment for orderly loading and unloading, making it suitable for assembly line operations.

[0052] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A loading and unloading mechanism for piston tube expansion stamping, comprising a machine base (1), characterized in that: An adjustment plate (2) is provided above the machine base (1), and a lifting mechanism and a horizontal movement mechanism for adjusting the position of the adjustment plate (2) are provided below the machine base (1). A rotary cylinder (3) is installed above the adjustment plate (2), and a rotating plate (26) is connected to the output shaft of the rotary cylinder (3). A first telescopic cylinder (4) is installed above the rotating plate (26) and is distributed horizontally. A connecting plate (5) is fixed above the first telescopic cylinder (4), and a second telescopic cylinder (6) is installed above the connecting plate (5). A vertical plate (7) is fixed to the piston rod end of the first telescopic cylinder (4), and a first pneumatic gripper (8) is fixed on the vertical plate (7). A second pneumatic gripper (9) is installed to the piston rod end of the second telescopic cylinder (6), and clamping plates (10) are installed on the grippers of the first pneumatic gripper (8) and the second pneumatic gripper (9).

2. The loading and unloading mechanism for piston tube expansion stamping according to claim 1, characterized in that: The machine base (1) has an installation port (11) in the middle. The lifting mechanism includes a fixed plate (12) fixed on one side of the installation port (11). A first slide rail (13) is provided on the fixed plate (12), and a lifting plate (14) is slidably provided on the first slide rail (13). A horizontal plate (15) is fixed at the upper end of the lifting plate (14), and an adjusting plate (2) is provided on the horizontal plate (15). A lifting cylinder (16) is installed on the fixed plate (12), and the piston rod end of the lifting cylinder (16) is fixed to the bottom of the horizontal plate (15).

3. The loading and unloading mechanism for piston tube expansion stamping according to claim 2, characterized in that: The transverse movement mechanism includes a second slide rail (17) fixed on a horizontal plate (15), an adjusting plate (2) slidably disposed above the second slide rail (17), two symmetrically distributed reinforcing plates (18) disposed below the horizontal plate (15), and a square groove (19) provided on the horizontal plate (15). A connecting member is fixed below the adjusting plate (2), and the connecting member passes through the square groove (19). A transverse movement cylinder (20) is disposed between the connecting member and one of the reinforcing plates (18), and the transverse movement cylinder (20) is parallel to the second slide rail (17).

4. The loading and unloading mechanism for piston tube expansion stamping according to claim 1, characterized in that: The adjustment plate (2) has a limit block (21) fixed to its side end.

5. The loading and unloading mechanism for piston tube expansion stamping according to claim 1, characterized in that: U-shaped frames (22) are fixed on both the rotating plate (26) and the connecting plate (5). The first telescopic cylinder (4) and the second telescopic cylinder (6) are fixed in the middle position of the U-shaped frame (22). Two symmetrically distributed guide rods (23) are slidably arranged on both sides of the U-shaped frame (22). One end of the guide rod (23) is connected to a U-shaped plate (24). The other end of the guide rod (23) located on both sides of the first telescopic cylinder (4) is connected to the piston rod end of the first telescopic cylinder (4) and a mounting plate (25) is connected to it. The other end of the guide rod (23) located on both sides of the second telescopic cylinder (6) is connected to the piston rod end of the second telescopic cylinder (6) and is connected to the vertical plate (7).

6. The loading and unloading mechanism for piston tube expansion stamping according to claim 1, characterized in that: The rotating plate (26) has several circumferentially distributed first mounting holes (27) on its side end, and two arc-shaped limiting plates (28) are connected to the side end of the rotating plate (26) by bolts. The arc-shaped limiting plates (28) have positioning holes (29) aligned with the first mounting holes (27). A stop block (30) is provided on the outer side of the arc-shaped limiting plates (28). A fixing rod (31) is fixed on the upper surface of the rotating cylinder (3), and a top rod (32) is provided at both ends of the fixing rod (31).

7. The loading and unloading mechanism for piston tube expansion stamping according to claim 6, characterized in that: The stop block (30) has a through hole, and a threaded rod (33) is inserted into the through hole. Both ends of the threaded rod (33) are threaded with fixing nuts, and the fixing nuts abut against the two sides of the stop block (30).

8. The loading and unloading mechanism for piston tube expansion stamping according to claim 6, characterized in that: The connecting plate (5) has several second mounting holes (34), and a circular plate (35) is provided above the connecting plate (5). The second telescopic cylinder (6) is provided on the circular plate (35). The circular plate (35) has several arc-shaped slots (36), and an embedding slot (37) is provided above the arc-shaped slots (36). The circular plate (35) is fixed to the connecting plate (5) by a washer bolt, and the washer bolt passes through the arc-shaped slot (36) and is threadedly connected to the second mounting hole (34). The bolt head of the washer bolt is located inside the embedding slot (37).

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