Fixing device for jade cutting

Abstract

The utility model relates to the technical field of jade cutting, in particular to a fixing device for jade cutting, which comprises a base, a rotating seat is rotatably arranged on the base, and the rotating seat is of a hollow cylindrical structure; strip-shaped sliding holes are symmetrically formed in the top of the rotating seat, a positive and negative tooth screw rod is rotationally arranged in the rotating seat, the positive and negative tooth screw rod is in transmission connection with two transmission blocks, a supporting block is fixedly arranged at the top of each transmission block, and the upper end of each supporting block penetrates through the corresponding strip-shaped sliding hole and is connected with a clamping mechanism. The clamping mechanism comprises an L-shaped base, a clamping assembly and a jacking assembly, the clamping assembly is arranged on the vertical portion of the L-shaped base, and the jacking assembly is arranged on the top of the vertical portion of the L-shaped base. According to the jade cutting device, jade can be effectively clamped and fixed so as to keep the stability of the jade, the situation that the jade moves in the jade cutting process, the jade cutting precision is affected is avoided, and it is guaranteed that the jade is kept complete after being cut, and the notch of the jade is regular.

Description

Technical Field

[0001] The utility model relates to the technical field of jade cutting, in particular to a fixing device for jade cutting. Background Art

[0002] Jade is a precious mineral material. Before jade carving, it needs to be split by a cutting machine. The purpose of splitting is to make full use of the jade material so that the cut jade can be carved into jade decorations. During the jade cutting process, it is necessary to ensure the integrity of the jade and the regularity of the jade incision to avoid wasting some of the jade raw materials.

[0003] During the jade cutting process, a clamp is required to clamp the jade to maintain the stability of the jade. The existing clamps cannot effectively clamp the jade, and the effect of clamping the jade is not ideal. The clamps may fail to fix the jade, causing the jade to move during the jade cutting process, affecting the accuracy of jade cutting, resulting in irregular cuts on the jade, destroying the integrity of the jade, causing part of the jade raw materials to be wasted, and increasing production and processing costs. Summary of the invention

[0004] The utility model aims to solve the problem that jade is prone to move during the jade cutting process in the prior art, and provides a fixing device for jade cutting. The device can effectively clamp and fix the jade to maintain the stability of the jade, avoid the movement of the jade during the jade cutting process, and affect the accuracy of jade cutting, and ensure that the jade remains intact after cutting and the incision of the jade is regular.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the utility model is: a fixing device for jade cutting, comprising a base, a rotating seat is rotatably arranged on the base, and the rotating seat is a cylindrical structure with a hollow interior; a strip-shaped sliding hole is symmetrically opened on the top of the rotating seat, and a positive and negative screw rod is rotatably arranged inside the rotating seat, and the positive and negative screw rods are connected to two transmission blocks for transmission, and a support block is fixedly arranged on the top of the transmission block, and the upper end of the support block passes through the strip-shaped sliding hole and is connected to a clamping mechanism. The positive and negative screw rods can drive the two transmission blocks to move closer to or farther from each other, so that the two clamping mechanisms move closer to or farther from each other, thereby achieving the effect of clamping and fixing the jade or loosening the jade, and the rotating seat can rotate on the base, and can rotate the rotating seat according to the position of cutting the jade.

[0006] The clamping mechanism comprises an L-shaped seat, a clamping assembly and a jacking assembly, wherein the clamping assembly is arranged at the vertical part of the L-shaped seat, and the jacking assembly is arranged at the top of the vertical part of the L-shaped seat. The purpose of clamping and fixing the jade is achieved by the clamping assemblies of the two clamping mechanisms, and the jade can be further fixed by the jacking assembly.

[0007] The clamping assembly includes a guide shaft and a spring. The guide shaft is slidably arranged on the L-shaped seat. Clamping circular plates and limiting circular plates are respectively connected to both ends of the guide shaft. The spring is sleeved on the guide shaft and is located between the clamping circular plate and the L-shaped seat. Under the action of the spring, the jade is clamped and fixed through the guide shaft and the clamping circular plate at its end.

[0008] The pressing assembly includes an inclined plate and a pressing pin shaft. The inclined plate is upwardly inclined and arranged at the top of the vertical part of the L-shaped seat. The pressing pin shaft is threadedly connected to the inclined plate. The effect of pressing and fixing the jade is achieved through the pressing pin shaft.

[0009] Further, a plurality of legs are arranged at the bottom of the base. A rotating groove matching the rotating seat is formed at the top of the base. The rotating seat is rotatably arranged inside the rotating groove. A support ring for supporting the rotating seat is also fixedly arranged in the rotating groove. The rotating groove facilitates the rotation of the rotating seat and plays a role in limiting the rotating seat at the same time. The support ring plays a role in supporting the rotating seat.

[0010] Further, a rotating shaft is fixedly arranged at the center position of the bottom of the rotating seat. The rotating shaft is rotatably connected to the base through a bearing. The purpose of the rotation of the rotating seat is achieved through the cooperation of the rotating shaft and the bearing.

[0011] Further, a plurality of limiting grooves are annularly arranged on the outer side wall of the rotating seat; T-shaped grooves communicating with the rotating groove are symmetrically formed on the base. A limiting plate matching the limiting groove is slidably arranged inside the T-shaped groove. After adjusting the position of cutting the jade, the rotating seat can be fixed through the cooperation of the limiting plate and the limiting groove, avoiding the phenomenon that the rotating seat rotates during the process of cutting the jade.

[0012] Further, side fixing blocks are symmetrically arranged on the outer side wall of the rotating seat. The side fixing blocks are located at the top of the base. Both ends of the left-right hand thread lead screw are respectively rotatably connected to the two side fixing blocks. One end of the left-right hand thread lead screw passes through the side fixing block and is fixedly connected with a hand wheel. The hand wheel facilitates the staff to rotate the left-right hand thread lead screw. The side fixing blocks play a role in installing the left-right hand thread lead screw.

[0013] Further, guide rods are arranged on both sides of the left-right hand thread lead screw. The transmission block is slidably sleeved on the guide rods. The guide rods play a role in guiding the movement of the transmission block.

[0014] Further, a mounting plate is fixedly arranged at the top of the support block. The mounting plate is slidably connected with the rotating seat. The L-shaped seat is fixedly arranged at the top of the mounting plate. A reinforcing plate is fixedly arranged at the connection of the vertical part and the horizontal part of the L-shaped seat.

[0015] Furthermore, the number of the clamping assemblies is two, the top pin shaft is located above the two clamping assemblies and between the two clamping assemblies; a through hole is formed in the vertical portion of the L-shaped seat, and the guiding shaft is slidably connected to the L-shaped seat through the through hole. A first rubber pad is fixedly arranged on the side of the clamping circular plate away from the L-shaped seat. The clamping mechanism fixes the jadeite at three points through the top pressing assembly and the two clamping assemblies, and the effect of clamping and fixing the jadeite is better.

[0016] Furthermore, the top pin shaft is arranged obliquely downward on the inclined plate, a top pressing circular plate is fixedly connected to the end of the top pin shaft, and a second rubber pad is fixedly arranged on the side of the top pressing circular plate away from the inclined plate. The top pin shaft presses and fixes the jadeite through the top pressing circular plate, and the second rubber pad plays a role in protecting the jadeite.

[0017] Through the above technical solutions, the beneficial effects of the present utility model are as follows:

[0018] The structure of the present utility model is reasonable and has good use effects. It can effectively clamp and fix the jadeite to maintain the stability of the jadeite, avoid the phenomenon that the jadeite moves during the process of cutting the jadeite, affect the precision of cutting the jadeite, ensure that the jadeite remains intact after cutting and the cut of the jadeite is regular, solve the problem that the jadeite is prone to move during the process of cutting the jadeite, and reduce the production cost.

[0019] The positive and negative thread screw rod of the present utility model can drive the two transmission blocks to approach or move away from each other. Through the two transmission blocks, the two clamping mechanisms can be driven to approach or move away from each other, so as to enable the two clamping mechanisms to achieve the purpose of clamping and fixing the jadeite or loosening the jadeite, and the two clamping mechanisms play the effect of clamping and fixing the jadeite.

[0020] The clamping mechanism of the present utility model achieves the purpose of clamping and fixing the jadeite through the two clamping assemblies, and can further fix the jadeite through the top pressing assembly. The clamping mechanism fixes the jadeite at three points through the top pressing assembly and the two clamping assemblies, and the effect of clamping and fixing the jadeite is better.

[0021] The clamping assembly of the clamping mechanism of the present utility model clamps and fixes the jadeite by the acting force of the spring, relying on the guiding shaft and the clamping circular plate at its end. The top pressing assembly presses and fixes the jadeite through the top pin shaft and the top pressing circular plate at its end. The top pin shaft presses the jadeite obliquely downward, improving the effect of clamping and fixing the jadeite; wherein both the first rubber pad and the second rubber pad play a role in protecting the jadeite.

[0022] The rotating seat of the present utility model can rotate in the rotating groove on the base, and the rotating seat can be rotated to achieve the effect of adjusting the cutting position of the jadeite; wherein the rotating seat can be fixed through the cooperation of the limiting plate and the limiting groove, avoiding the phenomenon that the rotating seat rotates during the process of cutting the jadeite. Description of the Drawings

[0023] Figure 1 is a schematic structure diagram of a fixing device for jade cutting of the present utility model Figure 1 ;

[0024] Figure 2 is a schematic structure diagram of a fixing device for jade cutting of the present utility model Figure 2 ;

[0025] Figure 3 is a schematic structure diagram of a fixing device for jade cutting of the present utility model Figure 3 ;

[0026] Figure 4 is a schematic structure diagram of a fixing device for jade cutting of the present utility model Figure 4 ;

[0027] Figure 5 is a schematic structure diagram of the base of the present utility model;

[0028] Figure 6 is a schematic structure diagram of the rotating seat and the clamping mechanism of the present utility model Figure 1 ;

[0029] Figure 7 is a schematic structure diagram of the rotating seat and the clamping mechanism of the present utility model Figure 2 ;

[0030] Figure 8 is a schematic structure diagram of the clamping mechanism of the present utility model;

[0031] Figure 9 is Figure 2 an enlarged structure diagram of part A in

[0032] Figure 10 is Figure 5 an enlarged structure diagram of part B in

[0033] The reference numerals in the drawings are: 1 is the base, 2 is the leg, 3 is the rotating groove, 4 is the support ring, 5 is the T-shaped groove, 6 is the limiting plate, 7 is the rotating seat, 8 is the limiting groove, 9 is the rotating shaft, 10 is the strip-shaped sliding hole, 11 is the side fixing block, 12 is the positive and negative thread screw rod, 13 is the hand wheel, 14 is the transmission block, 15 is the guiding rod, 16 is the support block, 17 is the mounting plate, 18 is the clamping mechanism, 19 is the L-shaped seat, 20 is the reinforcing plate, 21 is the guiding shaft, 22 is the clamping circular plate, 23 is the first rubber pad, 24 is the spring, 25 is the inclined plate, 26 is the top pin, 27 is the top circular plate, 28 is the second rubber pad. Specific embodiments

[0034] The present utility model will be further described below in conjunction with the drawings and specific embodiments:

[0035] AsFigures 1 to 10 As shown in Figures 1 to 10 , a fixing device for jade cutting includes a base 1, on which a rotating seat 7 is rotatably arranged. The rotating seat 7 is a hollow cylindrical structure; symmetric strip-shaped sliding holes 10 are formed at the top of the rotating seat 7. A left-handed and right-handed screw rod 12 is rotatably arranged inside the rotating seat 7. The left-handed and right-handed screw rod 12 is in driving connection with two driving blocks 14. A support block 16 is fixedly arranged at the top of the driving block 14. The upper end of the support block 16 passes through the strip-shaped sliding hole 10 and is connected with a clamping mechanism 18. In this embodiment, the upper surface of the rotating seat 7 is higher than the upper surface of the base 1. The strip-shaped sliding hole 10 corresponds to the left-handed and right-handed screw rod 12. The strip-shaped sliding hole 10 is used for the support block 16 to pass through the rotating seat 7. By rotating the left-handed and right-handed screw rod 12, the left-handed and right-handed screw rod 12 drives the two driving blocks 14 to approach or move away from each other. The driving block 14 drives the support block 16 to slide in the strip-shaped sliding hole 10. The support block 16 at the top of the driving block 14 drives the two clamping mechanisms 18 to approach or move away from each other.

[0036] The clamping mechanism 18 includes an L-shaped seat 19, a clamping component and a pressing component. The clamping component is arranged on the vertical part of the L-shaped seat 19, and the pressing component is arranged at the top of the vertical part of the L-shaped seat 19. In this embodiment, the clamping mechanism fixes the jade through the pressing component and the two clamping components, and fixes the jade in a three-point fixing manner, improving the effect of clamping and fixing the jade.

[0037] The clamping component includes a guide shaft 21 and a spring 24. The guide shaft 21 is slidably arranged on the L-shaped seat 19. The two ends of the guide shaft 21 are respectively connected with a clamping circular plate 22 and a limiting circular plate. The spring 24 is sleeved on the guide shaft 21 and is located between the clamping circular plate 22 and the L-shaped seat 19. In this embodiment, when the clamping component gradually approaches the jade and the clamping circular plate 22 contacts the jade, when the clamping component continues to move in the direction closer to the jade, the guide shaft 21 slides on the L-shaped seat 19, the spring 24 is compressed and generates an elastic acting force, and the clamping circular plate 23 clamps and fixes the jade by relying on the elastic acting force.

[0038] The pressing component includes an inclined plate 25 and a pressing pin 26. The inclined plate 25 is arranged obliquely upward at the top of the vertical part of the L-shaped seat 19. The pressing pin 26 is threadedly connected with the inclined plate 25. In this embodiment, the inclined plate 25 is located above the clamping component. The included angle between the inclined plate 25 and the vertical part of the L-shaped seat 19 is an obtuse angle. After the clamping components of the two clamping mechanisms clamp and fix the jade, rotate the pressing pin 26 so that the pressing pin 26 presses against the jade, and fix the jade by pressing with the pressing pin 26, further fixing the jade and ensuring the stability of the jade during the jade cutting process.

[0039] A plurality of legs 2 are arranged at the bottom of the base 1. A rotation groove 3 matching the rotation seat 7 is formed at the top of the base 1. The rotation seat 7 is rotatably arranged inside the rotation groove 3. A support ring 4 for supporting the rotation seat 7 is also fixedly arranged in the rotation groove 3. In this embodiment, the number of legs 2 is four, and each leg 2 is installed at the bottom corners of the base 1. The rotation groove 3 facilitates the rotation of the rotation seat 7, and at the same time, the rotation groove 3 also plays a role in limiting the rotation seat 7, and the support ring 4 supports the rotation seat 7.

[0040] A rotation shaft 9 is fixedly arranged at the central position of the bottom of the rotation seat 7. The rotation shaft 9 is rotatably connected to the base 1 through a bearing. In this embodiment, a groove is formed at the central position of the rotation groove 3, and the bearing is installed inside the groove. The rotation shaft 9 is in interference fit with the inner ring of the bearing.

[0041] A plurality of limit grooves 8 are annularly arranged on the outer side wall of the rotation seat 7; T-shaped grooves 5 communicating with the rotation groove 3 are symmetrically formed on the base 1. A limit plate 6 matching the limit grooves 8 is slidably arranged inside the T-shaped grooves 5. In this embodiment, when the position for cutting jade is adjusted by rotating the rotation seat 7, one of the limit grooves 8 on the rotation seat 7 is aligned with the limit plate 6, and then the limit plate 6 is inserted into the limit groove 8. The rotation seat 7 is fixed through the cooperation of the limit plate 6 and the limit grooves 8, avoiding the rotation of the rotation seat 7 during the process of cutting jade, which affects the cutting accuracy of the jade.

[0042] Side fixing blocks 11 are symmetrically arranged on the outer side wall of the rotation seat 7. The side fixing blocks 11 are located on the top of the base 1. The two ends of the left-right hand screw rod 12 are respectively rotatably connected to the two side fixing blocks 11. One end of the left-right hand screw rod 12 passes through the side fixing block 11 and is fixedly connected with a hand wheel 13. In this embodiment, when the rotation seat 7 rotates, the side fixing blocks 11 move on the upper surface of the base 1. The side fixing blocks 11 play a role in installing the left-right hand screw rod 12, and the hand wheel 13 facilitates the staff to rotate the left-right hand screw rod 12.

[0043] Guide rods 15 are arranged on both sides of the left-right hand screw rod 12. The transmission block 14 is slidably sleeved on the guide rods 15. In this embodiment, the guide rods 15 are fixedly installed inside the rotation seat 7. The number of guide rods 15 is two. The transmission block 14 is provided with sliding holes matching the guide rods 15. The guide rods 15 are sleeved on the guide rods 15 through the sliding holes. The guide rods 15 play a role in guiding the movement of the transmission block 14.

[0044] A mounting plate 17 is fixedly arranged at the top of the support block 16. The mounting plate 17 is slidably connected to the rotating base 7. The L-shaped seat 19 is fixedly arranged at the top of the mounting plate 17. A reinforcing plate 20 is fixedly arranged at the connection of the vertical part and the horizontal part of the L-shaped seat 19. In this embodiment, the mounting plate 17 is used to mount the L-shaped seat 19. The L-shaped seat 19 is bolted to the mounting plate 17. The number of the reinforcing plates 20 is two, and the reinforcing plates 20 play a role in stabilizing and strengthening the L-shaped seat 19.

[0045] The number of the clamping assemblies is two. The top pin 26 is located above the two clamping assemblies and between the two clamping assemblies. A through hole is formed in the vertical part of the L-shaped seat 19. The guide shaft 21 is slidably connected to the L-shaped seat 19 through the through hole. A first rubber pad 23 is fixedly arranged on the side of the clamping circular plate 22 away from the L-shaped seat 19. In this embodiment, the diameters of the clamping circular plate 22 and the limiting circular plate are both larger than the diameter of the through hole. When clamping and fixing the jade, the first rubber pad 23 contacts the jade, and the first rubber pad 23 plays a role in protecting the jade.

[0046] The top pin 26 is arranged obliquely downward on the inclined plate 25. The end of the top pin 26 is fixedly connected to a top circular plate 27. A second rubber pad 28 is fixedly arranged on the side of the top circular plate 27 away from the inclined plate 25. In this embodiment, when the top pin 26 clamps and fixes the jade, the second rubber pad 28 contacts the jade, and the second rubber pad 28 plays a role in protecting the jade.

[0047] The working principle of the present utility model is as follows: When cutting jade, the jade to be cut is placed at the center position on the top of the rotating base 7. Then, the staff rotates the positive and negative thread screw rod 12 through the hand wheel 13. The rotation of the positive and negative thread screw rod 12 drives the two transmission blocks 14 to approach each other. The two transmission blocks 14 slide on the guide rods 15 respectively. The two transmission blocks 14 drive the two clamping mechanisms 18 to approach each other through the support blocks 16 and the mounting plates 17 respectively. The support block 16 slides in the strip-shaped sliding hole 10, and the mounting plate 17 slides on the top of the rotating base 7.

[0048] After the rubber pads - 23 of the clamping components on the two clamping mechanisms 18 come into contact with the jade, when the two clamping mechanisms 18 continue to move towards the jade, the guide shaft 21 slides on the L-shaped seat 19, the spring 24 compresses and generates an elastic force, and the clamping circular plate 23 clamps and fixes the jade by relying on the elastic force. After the clamping components of the two clamping mechanisms 18 clamp and fix the jade, stop rotating the left-right threaded lead screw 12; then make the pressing components of the two clamping mechanisms 18 press against the jade, rotate the pressing pin 26 to make the pressing circular plate 27 move towards the jade, and when the rubber pad - 28 comes into contact with the jade and the pressing pin 26 cannot be rotated, stop rotating the pressing pin 26, and the pressing pin 26 presses and fixes the jade by relying on the pressing circular plate 27 and the rubber pad - 28 at its end.

[0049] After the jade is fixed, adjust the position of cutting the jade, that is, rotate the rotating seat 7 to make the rotating seat 7 rotate in the rotating groove 3. After adjusting the position of cutting the jade, stop rotating the rotating seat 7, and insert the limiting plates 6 in the two T-shaped grooves 5 into the limiting grooves 8 respectively, and use the cooperation between the limiting plate 6 and the limiting groove 8 to limit the rotating seat 7 to prevent the rotating seat 7 from rotating during the process of cutting the jade, and then the cutting operation can be performed on the jade. When the jade cutting is completed, rotate the left-right threaded lead screw 12 again to make the two transmission blocks 14 drive the two clamping mechanisms 18 to move away from each other and loosen the jade.

[0050] The above-described embodiments are only the preferred embodiments of the utility model, and do not limit the scope of implementation of the utility model. Therefore, any equivalent changes or modifications made to the technical solutions described within the scope of the utility model patent should be included within the scope of the patent application of the present utility model.

Claims

1. A fixing device for jade cutting, comprising a base (1), characterized in that, A rotating base (7) is rotatably arranged on the base (1), and the rotating base (7) is a hollow cylindrical structure; symmetric strip-shaped sliding holes (10) are formed at the top of the rotating base (7), a positive and negative thread screw rod (12) is rotatably arranged inside the rotating base (7), the positive and negative thread screw rod (12) is drivingly connected with two driving blocks (14), a support block (16) is fixedly arranged at the top of the driving block (14), and the upper end of the support block (16) passes through the strip-shaped sliding hole (10) and is connected with a clamping mechanism (18). The clamping mechanism (18) includes an L-shaped seat (19), a clamping component and a pressing component. The clamping component is arranged on the vertical part of the L-shaped seat (19), and the pressing component is arranged at the top of the vertical part of the L-shaped seat (19). The clamping component includes a guiding shaft (21) and a spring (24). The guiding shaft (21) is slidably arranged on the L-shaped seat (19). Clamping circular plates (22) and limiting circular plates are respectively connected to both ends of the guiding shaft (21). The spring (24) is sleeved on the guiding shaft (21) and is located between the clamping circular plate (22) and the L-shaped seat (19). The pressing component includes an inclined plate (25) and a pressing pin shaft (26). The inclined plate (25) is arranged obliquely upward at the top of the vertical part of the L-shaped seat (19), and the pressing pin shaft (26) is threadedly connected with the inclined plate (25).

2. The fixing device for jade cutting according to claim 1, wherein, A plurality of legs (2) are arranged at the bottom of the base (1). A rotating groove (3) matching the rotating base (7) is formed at the top of the base (1). The rotating base (7) is rotatably arranged inside the rotating groove (3), and a support ring (4) for supporting the rotating base (7) is fixedly arranged in the rotating groove (3).

3. A fixing device for jade cutting according to claim 1, characterized in that, A rotating shaft (9) is fixedly arranged at the central position of the bottom of the rotating base (7), and the rotating shaft (9) is rotatably connected with the base (1) through a bearing.

4. The fixing device for jade cutting according to claim 2, characterized in that, A plurality of limiting grooves (8) are annularly arranged on the outer side wall of the rotating base (7); T-shaped grooves (5) communicating with the rotating groove (3) are symmetrically formed on the base (1), and limiting plates (6) matching the limiting grooves (8) are slidably arranged inside the T-shaped grooves (5).

5. The fixing device for jade cutting according to claim 1, characterized in that, Side fixing blocks (11) are symmetrically arranged on the outer side wall of the rotating base (7). The side fixing blocks (11) are located on the top of the base (1). Both ends of the positive and negative thread screw rod (12) are rotatably connected with the two side fixing blocks (11) respectively. One end of the positive and negative thread screw rod (12) passes through the side fixing block (11) and is fixedly connected with a hand wheel (13).

6. The fixing device for jade cutting according to claim 5, characterized in that, Guide rods (15) are arranged on both sides of the positive and negative thread screw rod (12), and the driving blocks (14) are slidably sleeved on the guide rods (15).

7. A fixing device for jade cutting according to claim 1, characterized in that, An installation plate (17) is fixedly arranged at the top of the support block (16). The installation plate (17) is slidably connected with the rotating base (7). The L-shaped seat (19) is fixedly arranged at the top of the installation plate (17), and a reinforcing plate (20) is fixedly arranged at the connection of the vertical part and the horizontal part of the L-shaped seat (19).

8. A fixing device for jade cutting according to claim 1, characterized in that, The number of the clamping assemblies is two, the jacking pin shaft (26) is located above the two clamping assemblies and between the two clamping assemblies; a through hole is formed in the vertical portion of the L-shaped seat (19), and the guide shaft (21) is slidably connected to the L-shaped seat (19) through the through hole. A first rubber pad (23) is fixedly arranged on the side of the clamping circular plate (22) away from the L-shaped seat (19).

9. The fixing device for jade cutting according to claim 8, characterized in that, The jacking pin shaft (26) is arranged obliquely downward on the inclined plate (25), the end of the jacking pin shaft (26) is fixedly connected with a jacking circular plate (27), and a second rubber pad (28) is fixedly arranged on the side of the jacking circular plate (27) away from the inclined plate (25).

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