Automobile casting polishing clamp

Abstract

The utility model discloses an automobile casting polishing clamp, which relates to the technical field of clamps, and comprises a bottom plate and two groups of polishing mechanisms arranged above the bottom plate, the automobile casting polishing clamp is provided with a position adjusting assembly, and a first cylinder is controlled to drive a support plate and a lifting plate to move upwards and support an automobile casting; then a third servo motor is controlled to drive the automobile casting to rotate, the automobile casting can be driven to rotate, and therefore the position near the clamped position of the automobile casting can be conveniently polished, the applicability of the device is improved, a rotation assembly is arranged, a lifting plate is lifted to drive an inserting rod to be separated from an inserting groove, and a damaged polishing mechanism can be conveniently moved to the outer side of a supporting frame; and by arranging a pressure sensor, the pressure sensor can conveniently and automatically relieve limiting and fixing of the automobile casting when the position adjusting assembly supports the automobile casting.

Description

Technical Field

[0001] The utility model relates to the technical field of clamps, in particular to a grinding clamp for automobile castings. Background Art

[0002] Castings are metal shaped objects obtained by various casting methods. By pouring the smelted liquid metal into a pre-prepared mold by pouring, injection, suction or other casting methods, and then cooling it and undergoing subsequent processing such as grinding, a casting with a certain shape, size and performance can be obtained. The grinding of automobile castings requires a grinding mechanism, and a grinding fixture is needed to fix the automobile castings during the grinding process to improve the grinding accuracy and efficiency.

[0003] For example, a kind of automobile casting grinding fixture disclosed in the utility model with authorization announcement number CN220029679U drives the connecting rod through the cylinder to drive the clamp and the slider to slide inward on the outer wall of the slider, and the clamp can clamp and fix the workpiece. The workpiece is driven by motor 1 to rotate in a circle, so that the angle of the workpiece can be adjusted according to the grinding requirements. The clamp and the workpiece are driven to rotate by motor 2, so that the grinding position of the workpiece can be adjusted according to the grinding requirements.

[0004] This prior art also has the following problems when used:

[0005] During the process of grinding the workpiece by the device, the side of the workpiece close to the clamping plate is always clamped by the clamping plate, which makes it difficult for the grinding mechanism to grind the clamped side of the workpiece. The staff is required to release the fixation of the workpiece, remove the workpiece and manually adjust the grinding position of the workpiece. Utility Model Content

[0006] In order to overcome the deficiencies of the prior art, the utility model provides an automobile casting grinding fixture to solve the technical problems mentioned in the above background.

[0007] In order to solve the above technical problems, the utility model provides the following technical solutions: an automobile casting grinding fixture, comprising a bottom plate and a grinding mechanism, wherein two groups of grinding mechanisms are arranged above the bottom plate;

[0008] A position adjustment component is arranged below the grinding mechanism, and the position adjustment component can facilitate the grinding mechanism to grind the automobile casting near the clamping position;

[0009] A rotating assembly is arranged above the grinding mechanism, and the rotating assembly can facilitate the replacement of a damaged grinding mechanism;

[0010] A pressure sensor is provided below the grinding mechanism. The pressure sensor can facilitate the automatic release of the limit fixation of the automotive casting when the position adjustment component supports the automotive casting.

[0011] As a preferred technical solution of the present utility model, a support frame and a control panel are fixedly arranged on the top surface of the bottom plate. Two second cylinders are installed at the top inside the support frame. The bottom surface of the output end of the second cylinder is provided with a grinding mechanism. A fourth servo motor is fixedly installed inside the bottom plate. The output end of the fourth servo motor penetrates through the bottom plate and is rotationally connected to the bottom plate. The top surface of the output end of the fourth servo motor is fixedly provided with a housing. A first servo motor is fixedly installed on the outer side of the housing. The output end of the first servo motor penetrates through the housing and is rotationally connected to the housing. The end of the output end of the first servo motor is fixedly provided with a bidirectional threaded rod. The other end of the bidirectional threaded rod is rotationally connected to the inner wall of the housing through a bearing. Symmetrical moving plates are threadedly connected to the outer side of the bidirectional threaded rod. Symmetrical first rotating shafts and second rotating shafts are arranged inside the moving plate. The first rotating shaft is rotationally connected to the moving plate through a bearing. A second servo motor is fixedly installed on the outer side of the moving plate. The output end of the second servo motor penetrates through the moving plate and is rotationally connected to the moving plate. The end of the output end of the second servo motor is fixedly connected to the second rotating shaft. Clamping plates are fixedly arranged on one side of the first rotating shaft and the second rotating shaft close to each other.

[0012] As a preferred technical solution of the present utility model, the position adjustment component includes a first cylinder, a third servo motor, a support plate, a fixing plate, a lifting plate and a second spring. A fixing plate is fixedly arranged between the front and rear sides of the inner wall of the housing. A first cylinder is fixedly installed on the top surface of the fixing plate. The top surface of the output end of the first cylinder is fixedly installed with a third servo motor. The top surface of the output end of the third servo motor is fixedly provided with a support plate. A plurality of second springs are fixedly arranged on the bottom surface inside the support plate. The top surface of the second spring is fixedly provided with a lifting plate.

[0013] As a preferred technical solution of the present utility model, a vertical groove adapted to the lifting plate is arranged on the top surface of the support plate. The bottom surface of the vertical groove is fixedly connected to the second spring. The lifting plate is slidably connected to the support plate through the vertical groove. The center of the bottom surface of the vertical groove is fixedly connected to the pressure sensor.

[0014] As a preferred technical solution of the present utility model, the rotation replacement component includes a lifting plate, a cross-shaped plate, a plug rod, a first spring and a slot. A lifting plate is arranged above the support frame. Symmetrical first springs and three plug rods are fixedly arranged on the bottom surface of the lifting plate. A cross-shaped plate is arranged on the top surface of the support frame. Three slots are arranged on the top surface of the cross-shaped plate.

[0015] As a preferred technical solution of the utility model, the top surface of the support frame is provided with a cross-shaped slide groove adapted to the cross-shaped plate, the cross-shaped plate is slidably connected to the support frame through the cross-shaped slide groove, the insertion rod is adapted to the slot, the insertion rod is slidably connected to the cross-shaped plate through the slot, the end of the first spring away from the lifting plate is fixedly connected to the support frame, and the bottom surface of the cross-shaped plate is fixedly connected to the second cylinder.

[0016] Compared with the prior art, the utility model can achieve the following beneficial effects:

[0017] The utility model sets a position adjustment component to control the first cylinder to drive the support plate and the lifting plate to move upward and support the automobile casting, and then controls the third servo motor to drive the automobile casting to rotate, so as to drive the automobile casting to rotate, thereby facilitating the grinding of the automobile casting near the clamping position, thereby improving the applicability of the device; by setting a rotation component, the lifting plate is lifted to drive the insertion rod to disengage from the slot, so that the damaged grinding mechanism can be conveniently moved to the outside of the support frame, thereby realizing the replacement of the grinding mechanism without affecting the device for grinding the automobile casting; by setting a pressure sensor, the pressure sensor can automatically release the limit fixation of the automobile casting when the position adjustment component supports the automobile casting. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the cross-sectional structure of the main view of the utility model;

[0020] Figure 3 This is a schematic diagram of the partial structural breakdown of the angle adjustment component of the utility model;

[0021] Figure 4 It is a schematic diagram of the cross-sectional structure of the left side view of the utility model;

[0022] Among them: 1. bottom plate; 2. support frame; 3. grinding mechanism; 4. shell; 5. first servo motor; 6. moving plate; 7. second servo motor; 8. clamping plate; 9. first cylinder; 10. third servo motor; 11. support plate; 12. lifting plate; 13. cross-shaped plate; 14. insertion rod; 15. first spring; 16. fourth servo motor; 17. bidirectional threaded rod; 18. fixing plate; 19. second cylinder; 20. slot; 21. lifting plate; 22. second spring; 23. pressure sensor; 24. control panel. DETAILED DESCRIPTION

[0023] In order to make the technical means, creative features, achieved purposes and effects realized by the present utility model easy to understand, the present utility model will be further described below in conjunction with specific embodiments. However, the following embodiments are only the preferred embodiments of the present utility model and not all of them. Based on the embodiments in the implementation manner, other embodiments obtained by those skilled in the art without creative efforts all fall within the protection scope of the present utility model.

[0024] Embodiment

[0025] Please refer to Figures 1 - 4 As shown in the figure, the present utility model provides an automotive casting grinding fixture, which includes a bottom plate 1 and a grinding mechanism 3. A support frame 2 and a control panel 24 are fixedly arranged on the top surface of the bottom plate 1. The support frame 2 is of a U-shaped plate structure. Two second cylinders 19 are arranged between the inner top surface of the support frame 2 and the bottom plate 1. The bottom surface of the output end of the second cylinder 19 is equipped with a detachable grinding mechanism 3. Starting the grinding mechanism 3 and controlling the second cylinder 19 to drive the grinding mechanism 3 to move downward can grind the automotive casting. A fourth servo motor 16 is fixedly installed inside the bottom plate 1. The output end of the fourth servo motor 16 penetrates through the bottom plate 1 and is rotatably connected to the bottom plate 1. A housing 4 is fixedly arranged on the top surface of the output end of the fourth servo motor 16. Controlling the fourth servo motor 16 can drive the housing 4 to rotate. A first servo motor 5 is fixedly installed on the outer side of the housing 4. The output end of the first servo motor 5 penetrates through the housing 4 and is rotatably connected to the housing 4. The end of the output end of the first servo motor 5 is fixedly provided with a bidirectional threaded rod 17. The other end of the bidirectional threaded rod 17 is rotatably connected to the inner wall of the housing 4 through a bearing. Symmetrical moving plates 6 are threadedly connected to the outer side of the bidirectional threaded rod 17. Controlling the first servo motor 5 can drive the bidirectional threaded rod 17 to rotate, thereby driving the moving plates 6 to move outward or inward simultaneously along the bidirectional threaded rod 17.

[0026] As Figures 1 - 4 shown, a first rotating shaft and a second rotating shaft are arranged inside the moving plate 6. The first rotating shaft is rotatably connected to the moving plate 6 through a bearing. A second servo motor 7 is fixedly installed on the outer side of the moving plate 6. The output end of the second servo motor 7 penetrates through the moving plate 6 and is rotatably connected to the moving plate 6. The end of the output end of the second servo motor 7 is fixedly connected to the second rotating shaft. Clamping plates 8 are fixedly arranged on one side of the first rotating shaft and the second rotating shaft close to each other. Rubber anti-slip pads are pasted on the inner side of the clamping plates 8. Placing the automotive casting to be ground between the clamping plates 8 and controlling the first servo motor 5 to drive the moving plates 6 to approach each other until the clamping plates 8 clamp the automotive casting tightly can clamp and fix the automotive casting. Controlling the second servo motor 7 to drive the second rotating shaft to rotate can drive the clamping plates 8, the automotive casting and the first rotating shaft to rotate, so as to adjust the grinding position according to requirements.

[0027] As Figures 1 - 4As shown, a position adjustment component is arranged below the grinding mechanism 3. The position adjustment component consists of a first cylinder 9, a third servo motor 10, a support plate 11, a fixing plate 18, a lifting plate 21 and a second spring 22. A fixing plate 18 is fixedly arranged between the front and rear sides of the inner wall of the housing 4. The fixing plate 18 is arranged above the bidirectional threaded rod 17. A first cylinder 9 is fixedly installed on the top surface of the fixing plate 18. A third servo motor 10 is fixedly installed on the top surface of the output end of the first cylinder 9. A support plate 11 is fixedly arranged on the top surface of the output end of the third servo motor 10. A plurality of second springs 22 are fixedly arranged on the inner bottom surface of the support plate 11. A lifting plate 21 is fixedly arranged on the top surface of the second spring 22. The top surface of the lifting plate 21 is a rough surface. A vertical groove adapted to the lifting plate 21 is arranged on the top surface of the support plate 11. The bottom surface of the vertical groove is fixedly connected to the second spring 22. The lifting plate 21 is slidably connected to the support plate 11 through the vertical groove. Control the first cylinder 9 to drive the support plate 11 and the lifting plate 21 to move upward to support the automotive casting. When the lifting plate 21 contacts the automotive casting, it can move downward relative to the support plate 11 in the vertical groove, so as to prevent the support plate 11 from directly contacting the automotive casting and causing damage to the automotive casting due to extrusion. Control the third servo motor 10 to drive the automotive casting to rotate, which can drive the automotive casting to rotate, so as to facilitate grinding of the vicinity of the clamped position of the automotive casting and improve the applicability of the device.

[0028] Specifically, when it is necessary to grind the vicinity of the clamped position of the automotive casting, control the first cylinder 9 to drive the third servo motor 10, the support plate 11 and the lifting plate 21 to move upward. When the lifting plate 21 contacts the automotive casting, it can move downward relative to the support plate 11 in the vertical groove, and the second spring 22 is compressed until the compression amount of the second spring 22 reaches the maximum. At this time, the support plate 11 cooperates with the lifting plate 21 and the second spring 22 to support the automotive casting. Control the first servo motor 5 to drive the moving plate 6 to move away from each other along the bidirectional threaded rod 17, so as to drive the clamping plates 8 to move away from each other to release the limit on the automotive casting until the distance between the clamping plates 8 reaches the maximum. Control the third servo motor 10 to drive the support plate 11 to rotate by 90 degrees, so as to drive the lifting plate 21, the second spring 22 and the automotive casting to rotate by 90 degrees. Control the first servo motor 5 to drive the clamping plates 8 to move closer to each other to clamp and fix the automotive casting again. Control the first cylinder 9 to drive the third servo motor 10 to move downward to the original position, and then control the second servo motor 7 to drive the automotive casting to rotate, so as to rotate the vicinity of the clamped position of the automotive casting to directly below the grinding mechanism 3, so as to facilitate the grinding mechanism 3 to grind it.

[0029] As Figures 1 - 4As shown in the figure, a rotation component is arranged above the grinding mechanism 3. The rotation component is composed of a lifting plate 12, a cross-shaped plate 13, a plug rod 14, a first spring 15 and a slot 20. A lifting plate 12 is arranged above the support frame 2. Symmetric first springs 15 and three plug rods 14 are fixedly arranged on the bottom surface of the lifting plate 12. One end of the first spring 15 far away from the lifting plate 12 is fixedly connected with the support frame 2. A cross-shaped plate 13 is arranged on the top surface of the support frame 2. A cross-shaped sliding groove adapted to the cross-shaped plate 13 is arranged on the top surface of the support frame 2. The cross-shaped plate 13 is slidably connected with the support frame 2 through the cross-shaped sliding groove. Three slots 20 adapted to the plug rods 14 are equidistantly arranged on the top surface of the cross-shaped plate 13. The plug rod 14 is slidably connected with the cross-shaped plate 13 through the slot 20. When the plug rod 14 extends into the slot 20, it can prevent the cross-shaped plate 13 from moving left and right, so as to limit the position of the grinding mechanism 3 in the horizontal direction. The bottom surface of the cross-shaped plate 13 is fixedly connected with the second air cylinder 19. Through grooves for facilitating the left and right movement of the second air cylinder 19 and the grinding mechanism 3 are arranged through the left and right sides of the support frame 2. Lifting the lifting plate 12 to drive the plug rod 14 out of the slot 20 can facilitate moving the damaged grinding mechanism 3 to the outside of the support frame 2, so as to replace the grinding mechanism 3 without affecting the grinding of automobile castings by the device.

[0030] Specifically, when the damaged grinding mechanism 3 needs to be replaced, lift the lifting plate 12 to drive the plug rod 14 to move upward, and the first spring 15 is stretched until the plug rod 14 disengages from the slot 20. Move the cross-shaped plate 13 left or right to drive the second air cylinder 19 and the grinding mechanism 3 to move left or right until the undamaged grinding mechanism 3 moves to the exact center inside the support frame 2. At this time, the plug rod 14 is aligned with the slot 20, and the damaged grinding mechanism 3 moves to the outside of the support frame 2. Release the lifting plate 12 so that the first spring 15 pulls the lifting plate 12 to move downward, and the plug rod 14 enters the slot 20 to re-limit the position of the grinding mechanism 3 in the horizontal direction. Disassemble and replace the damaged grinding mechanism 3. The undamaged grinding mechanism 3 can cooperate with the second air cylinder 19 to continue grinding the automobile castings, so as to replace the grinding mechanism 3 without affecting the grinding of automobile castings by the device.

[0031] As Figures 1 - 3 As shown in the figure, a pressure sensor 23 is arranged below the grinding mechanism 3. The center of the bottom surface of the vertical groove of the support plate 11 is fixedly connected with the pressure sensor 23. The pressure sensor 23 is electrically connected with the control panel 24. When the lifting plate 21 contacts the automobile casting and the compression amount of the second spring 22 reaches the maximum, the bottom of the lifting plate 21 just contacts the pressure sensor 23. The pressure sensor 23 sends an electrical signal to the control panel 24, and the control panel 24 can control the first air cylinder 9 to stop running, and at the same time control the first servo motor 5 to drive the clamping plate 8 to move outward to the maximum distance, so as to facilitate automatically releasing the limit fixation of the automobile casting when the position adjustment component supports the automobile casting.

[0032] Specific working principle:

[0033] When the device is in use, place the automotive casting to be polished between the clamping plates 8. Control the first servo motor 5 to drive the moving plates 6 to approach each other until the clamping plates 8 tightly hold the automotive casting, so as to clamp and fix the automotive casting. Start the polishing mechanism 3 and control the second cylinder 19 to drive the polishing mechanism 3 to move downward, then the automotive casting can be polished. Control the second servo motor 7 to drive the second rotating shaft to rotate, which can drive the clamping plates 8, the automotive casting and the first rotating shaft to rotate, so as to adjust the polishing position according to requirements. Control the fourth servo motor 16 to drive the housing 4 to rotate, and the angle of the workpiece placement can be adjusted according to the polishing requirements.

[0034] When it is necessary to polish the area near the clamped position of the automotive casting, control the first cylinder 9 to drive the third servo motor 10, the support plate 11 and the lifting plate 21 to move upward. When the lifting plate 21 contacts the automotive casting, it can move downward relative to the support plate 11 in the vertical groove, and the second spring 22 is compressed until the compression amount of the second spring 22 reaches the maximum. At this time, the support plate 11, in cooperation with the lifting plate 21 and the second spring 22, can support the automotive casting. The bottom of the lifting plate 21 just touches the pressure sensor 23, and the pressure sensor 23 sends an electrical signal to the control panel 24. The control panel 24 can control the first cylinder 9 to stop running. At the same time, control the first servo motor 5 to drive the clamping plates 8 to move outward to the maximum distance, automatically releasing the limit on the automotive casting. Control the third servo motor 10 to drive the support plate 11 to rotate 90 degrees, thus driving the lifting plate 21, the second spring 22 and the automotive casting to rotate 90 degrees. Control the first servo motor 5 to drive the clamping plates 8 to approach each other again to clamp and fix the automotive casting. Control the first cylinder 9 to drive the third servo motor 10 to move downward to the original position, and then control the second servo motor 7 to drive the automotive casting to rotate, so that the area near the clamped position of the automotive casting can be rotated to directly below the polishing mechanism 3, thus facilitating the polishing mechanism 3 to polish it and improving the applicability of the device.

[0035] When the damaged grinding mechanism 3 needs to be replaced, the lifting plate 12 is lifted to drive the insertion rod 14 to move upward, and the first spring 15 is extended until the insertion rod 14 disengages from the slot 20. The cross plate 13 is moved left or right to drive the second cylinder 19 and the grinding mechanism 3 to move left or right until the undamaged grinding mechanism 3 moves to the center of the inner side of the support frame 2. At this time, the insertion rod 14 is aligned with the slot 20, and the damaged grinding mechanism 3 moves to the outside of the support frame 2. The lifting plate 12 is released to allow the first spring 15 to pull the lifting plate 12 to move downward, and the insertion rod 14 enters the slot 20 to re-limit the horizontal position of the grinding mechanism 3. The damaged grinding mechanism 3 is disassembled and replaced, and the undamaged grinding mechanism 3 can cooperate with the second cylinder 19 to continue to grind the automobile casting, thereby realizing the replacement of the grinding mechanism 3 without affecting the grinding of the automobile casting by the device.

[0036] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A grinding fixture for automobile castings, comprising a base plate (1) and a grinding mechanism (3), wherein two sets of grinding mechanisms (3) are arranged above the base plate (1), characterized in that: Also includes A position adjustment component, the position adjustment component is arranged below the grinding mechanism (3), and the position adjustment component can facilitate the grinding mechanism (3) to grind the vicinity of the clamping position of the automobile casting; A rotating assembly, the rotating assembly being arranged above the grinding mechanism (3), and the rotating assembly can facilitate replacement of a damaged grinding mechanism (3); A pressure sensor (23) is arranged below the grinding mechanism (3). The pressure sensor (23) can automatically release the limit fixation of the automobile casting when the position adjustment component supports the automobile casting.

2. The automotive casting grinding fixture according to claim 1, characterized in that: A support frame (2) and a control panel (24) are fixedly arranged on the top surface of the bottom plate (1), two second cylinders (19) are installed on the top of the inner side of the support frame (2), and a grinding mechanism (3) is installed on the bottom surface of the output end of the second cylinder (19). A fourth servo motor (16) is fixedly installed inside the bottom plate (1), and the output end of the fourth servo motor (16) passes through the bottom plate (1) and is rotatably connected to the bottom plate (1). A housing (4) is fixedly arranged on the top surface of the output end of the fourth servo motor (16), and a first servo motor (5) is fixedly installed on the outer side of the housing (4), and the output end of the first servo motor (5) passes through the housing (4) and is rotatably connected to the housing (4). A bidirectional threaded rod (17) is fixedly arranged at the end of the output end, the other end of the bidirectional threaded rod (17) is rotatably connected to the inner wall of the housing (4) through a bearing, a symmetrical moving plate (6) is threadedly connected to the outer side of the bidirectional threaded rod (17), a symmetrical first rotating shaft and a second rotating shaft are arranged on the inner side of the moving plate (6), the first rotating shaft is rotatably connected to the moving plate (6) through a bearing, a second servo motor (7) is fixedly installed on the outer side of the moving plate (6), the output end of the second servo motor (7) passes through the moving plate (6) and is rotatably connected to the moving plate (6), the output end of the second servo motor (7) is fixedly connected to the second rotating shaft, and a clamping plate (8) is fixedly arranged on the side where the first rotating shaft and the second rotating shaft are close to each other.

3. The automobile casting grinding fixture according to claim 2, characterized in that: The position adjustment component comprises a first cylinder (9), a third servo motor (10), a support plate (11), a fixed plate (18), a lifting plate (21) and a second spring (22); a fixed plate (18) is fixedly arranged between the front and rear sides of the inner wall of the shell (4); the first cylinder (9) is fixedly installed on the top surface of the fixed plate (18); the third servo motor (10) is fixedly installed on the top surface of the output end of the first cylinder (9); the support plate (11) is fixedly arranged on the top surface of the output end of the third servo motor (10); a plurality of second springs (22) are fixedly arranged on the bottom surface of the support plate (11); and the lifting plate (21) is fixedly arranged on the top surface of the second spring (22).

4. The automobile casting grinding fixture according to claim 3 is characterized in that: The top surface of the support plate (11) is provided with a vertical groove adapted to the lifting plate (21), the bottom surface of the vertical groove is fixedly connected to the second spring (22), the lifting plate (21) is slidably connected to the support plate (11) via the vertical groove, and the center of the bottom surface of the vertical groove is fixedly connected to the pressure sensor (23).

5. The automobile casting grinding fixture according to claim 2, characterized in that: The rotation assembly comprises a lifting plate (12), a cross-shaped plate (13), an insertion rod (14), a first spring (15) and a slot (20); the lifting plate (12) is arranged above the support frame (2); a symmetrical first spring (15) and three insertion rods (14) are fixedly arranged on the bottom surface of the lifting plate (12); a cross-shaped plate (13) is arranged on the top surface of the support frame (2); and three slots (20) are arranged on the top surface of the cross-shaped plate (13).

6. The automobile casting grinding fixture according to claim 5, characterized in that: The top surface of the support frame (2) is provided with a cross-shaped groove adapted to the cross-shaped plate (13); the cross-shaped plate (13) is slidably connected to the support frame (2) via the cross-shaped groove; the insertion rod (14) is adapted to the slot (20); the insertion rod (14) is slidably connected to the cross-shaped plate (13) via the slot (20); the end of the first spring (15) away from the lifting plate (12) is fixedly connected to the support frame (2); and the bottom surface of the cross-shaped plate (13) is fixedly connected to the second cylinder (19).

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