Grinding wheel dresser of grinding machine

Abstract

The invention relates to the technical field of grinding machines, in particular to a grinding machine grinding wheel dresser which comprises a base, an adjusting assembly is slidably mounted on the outer wall of the top of the base, a dressing assembly is mounted on the outer wall of the top of the adjusting assembly, the adjusting assembly comprises an adjusting seat, a ridge groove is formed in the outer wall of the top of the adjusting seat, and limiting grooves are formed in the inner walls of the two sides of the ridge groove; the trimming assembly comprises a trimming stone body, prisms are fixedly connected to the outer wall of the bottom of the trimming stone body, and the specifications of the prisms are matched with those of the edge grooves. The defects in the prior art are overcome, the prism is arranged on the finishing stone body, the prism is matched with the edge groove in the adjusting seat, the finishing stone is conveniently installed and positioned, the two adjustable limiting blocks are arranged in the prism, and the finishing stone body can be installed and fixed when the limiting blocks are inserted into the limiting grooves, so that the finishing stone is convenient to install and position. And the screw rod in the prism is matched with the trapezoidal block, so that the limiting block is conveniently and directly driven to act through the movement of the trapezoidal block.

Description

Technical Field

[0001] The invention relates to the technical field of grinding machines, in particular to a grinding wheel dresser for a grinding machine. Background Art

[0002] A grinder is a machine tool that uses abrasive tools to grind the surface of a workpiece. Most grinders use high-speed rotating grinding wheels for grinding, while a few use other grinding tools such as oilstones and abrasive belts and free abrasives for processing, such as honing machines, superfinishing machines, belt grinders, grinders and polishers. Grinding machines can process materials with higher hardness, such as hardened steel, cemented carbide, etc.; they can also process brittle materials, such as glass and granite. Grinding machines can perform high-precision grinding with very small surface roughness, and can also perform high-efficiency grinding, such as strong grinding. The grinding wheel of the grinder needs to be regularly dressed during use, and the dresser is used to repair it during dressing. The grinding wheel dresser is a special machine tool accessory used for manual flat grinding, universal tool grinding and various surface grinders and curve grinders to dress various grinding wheel sections composed of straight lines and arcs. The grinding wheel dresser and block gauge can be used together to obtain the required convex R and concave R angle precision grinding wheel. The thickness dresser and synchronous grinding wheel dresser can dress the thickness and both sides of the grinding wheel. The structure of the grinding wheel dresser itself can dress the grinding wheel to a very precise size.

[0003] When machining the flange and the outer circle of the intermediate bearing, it is necessary to adjust the particle size of the grinding wheel during the machining process. Since the length of the intermediate shaft is too large and exceeds the stroke of the grinding wheel guide rail, the artificial diamond at the tailstock end cannot be used. Therefore, it is necessary to add a grinding wheel dresser device between the intermediate shaft where no grinding is required and the grinding wheel, and install artificial diamond to meet the machining needs. Summary of the invention

[0004] The purpose of the present invention is to solve or at least alleviate the problems existing in the prior art.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a grinding wheel dresser for a grinding machine, comprising a base, an adjusting component is slidably mounted on the top outer wall of the base, and a dressing component is mounted on the top outer wall of the adjusting component, the adjusting component comprises an adjusting seat, and a rib groove is provided on the top outer wall of the adjusting seat, and limiting grooves are provided on the inner walls on both sides of the rib groove, the dressing component comprises a dressing stone body, and a prism is fixedly connected to the bottom outer wall of the dressing stone body, and the specifications of the prism match the specifications of the rib groove.

[0006] By adopting the above structure, the setting of the base facilitates the sliding installation of the adjustment component, the dressing component is conveniently installed on the adjustment component, the dressing stone body in the dressing component facilitates the dressing of the grinding wheel, and the grooves on the adjustment seat facilitate installation and positioning in conjunction with the prisms on the dressing stone body.

[0007] In a possible implementation, a mounting cavity is provided inside the prism, and rectangular openings are provided on the inner walls on both sides of the mounting cavity. The inner walls of the two rectangular openings are slidably connected to limit blocks, and the specifications of the limit blocks match the specifications of the limit grooves.

[0008] By adopting the above structure, the two limit blocks can be conveniently slidably installed through the installation cavity in the prism, and the cooperation between the limit blocks and the limit grooves makes it convenient to clamp the prism in the prism groove.

[0009] In a possible implementation, a driving cavity connected to the installation cavity is provided inside the dressing stone body, and a same trapezoidal block is slidably connected between the installation cavity and the driving cavity, driving grooves are provided on the outer walls on both sides of the trapezoidal block, and one end of the two limit blocks are respectively slidably connected to the inner walls of the two driving grooves.

[0010] By adopting the above structure, the two limiting blocks can be easily driven to move by the trapezoidal block slidably connected in the installation cavity, thereby facilitating the limiting blocks to be pulled out of the limiting grooves.

[0011] In a possible implementation, the installation cavity and the driving cavity are rotatably connected by a same screw rod, a thread groove is provided on the outer wall of the top of the trapezoidal block, and the screw rod is screwed on the inner wall of the thread groove.

[0012] By adopting the above structure, the setting of the screw rod can conveniently and directly drive the trapezoidal block to slide, and when the trapezoidal block slides, it can conveniently and directly drive the limit block to move.

[0013] In one possible implementation, one end of the screw is fixedly connected to a worm wheel, and the inner walls on both sides of the drive chamber are rotatably connected to the same worm, the worm and the worm wheel are meshed with each other, a circular groove is provided on the outer wall of the dressing stone body, and the inner wall of the circular groove is rotatably connected to a rotating disk, and one end of the rotating disk drive shaft is fixedly connected to the worm.

[0014] By adopting the above structure, the worm is driven to rotate by the rotating disk, and the rotation of the worm directly drives the worm wheel to rotate, and the rotation of the worm wheel directly drives the screw to rotate, thereby facilitating the sliding of the trapezoidal block.

[0015] In a possible implementation, the bottom outer wall of the adjustment seat is fixedly connected to two symmetrically arranged sliding seats, and the outer walls of the two sliding seats on the side away from each other are provided with L-shaped grooves, and the inner walls of the two L-shaped grooves are slidably connected to limit racks, and the top outer wall of the base is provided with two symmetrically arranged sliding grooves, and the inner wall of one side of the two sliding grooves is provided with multiple tooth grooves distributed at equal distances, and the sliding seat is slidably connected to the inner wall of the sliding groove.

[0016] By adopting the above structure and setting the L-shaped groove in the sliding seat, it is convenient to slide and install the limit rack, and the limit rack and the tooth groove are engaged to facilitate fixing the adjustment seat on the base.

[0017] In a possible implementation, the inner walls of the two L-shaped grooves are slidably connected to a driving seat, and the two driving seats are fixedly connected to two limiting racks, and the outer wall of one side of the adjustment seat is rotatably connected to a rotating part.

[0018] By adopting the above structure, the driving seat slides in the L-shaped groove, thereby conveniently driving the two limiting racks to move.

[0019] In a possible implementation, the inner walls on both sides of the adjustment seat are rotatably connected to the same bidirectional screw, and the outer walls of the bidirectional screw are both threaded with threaded sleeves, the outer walls of the two threaded sleeves are rotatably connected to two symmetrically arranged connecting plates, the inner wall of the adjustment seat is slidably connected to two sliding plates, the four connecting plates are rotatably connected to the two sliding plates, the two driving seats are respectively fixedly connected to the two sliding plates, the transmission shaft of the rotating part is fixedly connected to the bidirectional screw, a groove is provided on the outer wall of the bottom of the prism, and a contact block is slidably connected to the inner wall of the groove.

[0020] By adopting the above structure, the bidirectional screw is driven to rotate by the rotating part, and the bidirectional screw drives the two threaded sleeves to move toward or away from each other when rotating. When the threaded sleeves move, they can cooperate with the connecting plate to drive the two sliding plates to move toward or away from each other, thereby driving the limit rack to move conveniently.

[0021] In a possible implementation, two springs 1 are fixedly connected to the inner wall of the top of the groove, and the two springs 1 are fixedly connected to the contact block.

[0022] By adopting the above structure, the contact block is conveniently supported by the spring in the groove, thereby conveniently driving the contact block to be pressed in the adjustment seat.

[0023] In a possible implementation, the inner wall of the groove is fixedly connected to a fixing rod, and the outer wall of the fixing rod is slidably connected to two symmetrically arranged sliding sleeves, the outer walls of the two sliding sleeves are rotatably connected to connecting rods, and one end of the two connecting rods is rotatably connected to the contact block, and the outer wall of the fixing rod is sleeved with two symmetrically arranged springs 2.

[0024] By adopting the above structure, the two sliding sleeves are driven to move toward each other by the second spring, so that the contact block is pushed and pressed into the adjustment seat by the connecting rod.

[0025] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention facilitates the installation of the dressing device on the grinding machine by means of the cooperation between the adjusting component and the dressing component, thereby solving the problem that the length of the intermediate shaft is too large and exceeds the travel of the grinding wheel guide rail. The cooperation between the adjusting component and the dressing component facilitates the rapid disassembly and assembly of the dressing stone body, thereby facilitating the replacement of the dressing stone body. (2) The present invention provides a prism on the dressing stone body, and the cooperation between the prism and the prism groove on the adjustment seat facilitates the installation and positioning of the dressing stone. Two adjustable limit blocks are provided in the prism. When the limit blocks are inserted into the limit grooves, the dressing stone body can be installed and fixed. The cooperation between the screw rod and the trapezoidal block in the prism facilitates the movement of the limit blocks directly by moving the trapezoidal block. (3) The present invention facilitates the adjustment of the position of the dressing stone body by means of the cooperation between the base and the adjustment seat. The cooperation between the bidirectional screw, the connecting plate and the sliding plate in the adjustment seat facilitates the movement of the two limit racks. When the limit racks and the tooth grooves are engaged, the adjustment seat is conveniently fixed on the base, thereby ensuring the stability of the adjustment seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the base structure of the present invention; Figure 3 It is a schematic diagram of the structure of the regulating component of the present invention; Figure 4 It is a schematic cross-sectional structure diagram of the adjustment seat of the present invention; Figure 5 It is a schematic cross-sectional structural diagram of the sliding seat of the present invention; Figure 6 It is a schematic diagram of the three-dimensional structure of the adjustment seat of the present invention; Figure 7 It is a schematic diagram of the structure of the dressing stone body of the present invention; Figure 8 This is a schematic diagram of a prism cross-sectional structure of a first embodiment of the present invention; Fig. 9 It is a schematic diagram of a cross-sectional structure of a two-prism according to an embodiment of the present invention.

[0027] In the figure: 1. base; 2. adjustment component; 3. dressing component; 4. slide groove; 5. tooth groove; 6. adjustment seat; 7. rotating part; 8. sliding seat; 9. limit rack; 10. prism groove; 11. limit groove; 12. dressing stone body; 13. rotating disk; 14. prism; 15. limit block; 16. contact block; 17. bidirectional screw; 18. threaded sleeve; 19. connecting plate; 20. sliding plate; 21. L-shaped groove; 22. driving seat; 23. worm gear; 24. screw; 25. trapezoidal block; 26. groove; 27. spring one; 28. fixing rod; 29. ​​spring two; 30. sleeve; 31. connecting rod; 32. worm. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Embodiment 1 See also Figure 1-8 A grinding wheel dresser for a grinding machine comprises a base 1, an adjusting component 2 is slidably mounted on the top outer wall of the base 1, and a dressing component 3 is mounted on the top outer wall of the adjusting component 2, the adjusting component 2 comprises an adjusting seat 6, and a prism 10 is provided on the top outer wall of the adjusting seat 6, and limiting grooves 11 are provided on the inner walls on both sides of the prism groove 10, the dressing component 3 comprises a dressing stone body 12, and a prism 14 is fixedly connected to the bottom outer wall of the dressing stone body 12, and the specifications of the prism 14 match the specifications of the prism groove 10, the setting of the base 1 facilitates the sliding installation of the adjusting component 2, the installation of the dressing component 3 is convenient on the adjusting component 2, the dressing stone body 12 in the dressing component 3 facilitates the dressing of the grinding wheel, and the prism groove 10 on the adjusting seat 6 facilitates the installation and positioning with the prism 14 on the dressing stone body 12.

[0030] For details, please refer to Figure 7-8 An installation cavity is provided inside the prism 14, and rectangular openings are provided on the inner walls on both sides of the installation cavity. The inner walls of the two rectangular openings are slidably connected to limit blocks 15. The specifications of the limit blocks 15 match the specifications of the limit grooves 11. The installation cavity in the prism 14 facilitates the sliding installation of the two limit blocks 15. The cooperation between the limit blocks 15 and the limit grooves 11 facilitates the prism 14 to be clamped in the prism grooves 10.

[0031] For details, please refer to Figure 8 A driving cavity connected to the installation cavity is provided inside the dressing stone body 12, and a same trapezoidal block 25 is slidably connected between the installation cavity and the driving cavity. Driving grooves are provided on the outer walls of both sides of the trapezoidal block 25, and one end of the two limit blocks 15 are respectively slidably connected to the inner walls of the two driving grooves. The trapezoidal block 25 slidably connected in the installation cavity can conveniently drive the two limit blocks 15 to move, thereby facilitating the limit block 15 to be pulled out of the limit groove 11.

[0032] For details, please refer to Figure 8 The same screw 24 is rotatably connected between the installation cavity and the driving cavity. A threaded groove is provided on the top outer wall of the trapezoidal block 25. The screw 24 is screwed on the inner wall of the threaded groove. The setting of the screw 24 facilitates the direct driving of the trapezoidal block 25 to slide. When the trapezoidal block 25 slides, it is convenient to directly drive the limit block 15 to move.

[0033] For details, please refer to Figure 8 One end of the screw 24 is fixedly connected to a worm wheel 23, and the inner walls on both sides of the driving chamber are rotatably connected to the same worm 32, the worm 32 and the worm wheel 23 are meshed with each other, a circular groove is provided on the outer wall of the dressing stone body 12, and a rotating disk 13 is rotatably connected to the inner wall of the circular groove, one end of the transmission shaft of the rotating disk 13 is fixedly connected to the worm 32, and the worm 32 is driven to rotate by the rotating disk 13. When the worm 32 rotates, the worm wheel 23 is directly driven to rotate. When the worm wheel 23 rotates, the screw 24 is directly driven to rotate, thereby facilitating the driving of the trapezoidal block 25 to slide.

[0034] For details, please refer to Figure 5 The outer wall at the bottom of the adjusting seat 6 is fixedly connected to two symmetrically arranged sliding seats 8, and the outer walls of the two sliding seats 8 on the separated side are each provided with an L-shaped groove 21, and the inner walls of the two L-shaped grooves 21 are both slidably connected to the limiting rack 9, and the outer wall of the top of the base 1 is provided with two symmetrically arranged slide grooves 4, and the inner walls of one side of the two slide grooves 4 are provided with a plurality of equidistantly distributed tooth grooves 5, the sliding seat 8 is slidably connected to the inner wall of the slide groove 4, and the setting of the L-shaped groove 21 in the sliding seat 8 facilitates the sliding installation of the limiting rack 9, and the limiting rack 9 is engaged with the tooth groove 5 to facilitate fixing the adjusting seat 6 on the base 1.

[0035] For details, please refer to Figure 5 The inner walls of the two L-shaped grooves 21 are slidably connected with a driving seat 22, and the two driving seats 22 are fixedly connected to the two limit racks 9. The outer wall of one side of the adjustment seat 6 is rotatably connected with a rotating part 7, and the driving seat 22 slides in the L-shaped groove 21, thereby conveniently driving the two limit racks 9 to move.

[0036] For details, please refer to Figure 4 The inner walls of both sides of the adjusting seat 6 are rotatably connected with the same bidirectional screw 17, and the outer walls of the bidirectional screw 17 are screwed with threaded sleeves 18, and the outer walls of the two threaded sleeves 18 are rotatably connected with two symmetrically arranged connecting plates 19, and the inner wall of the adjusting seat 6 is slidably connected with two sliding plates 20, and the four connecting plates 19 are rotatably connected to the two sliding plates 20 respectively, and the two driving seats 22 are fixedly connected to the two sliding plates 20 respectively, and the transmission shaft of the rotating part 7 is fixedly connected to the bidirectional screw 17, and a groove 26 is provided on the outer wall of the bottom of the prism 14, and the inner wall of the groove 26 is slidably connected with a contact block 16, and the bidirectional screw 17 is driven to rotate by the rotating part 7. When the bidirectional screw 17 rotates, the two threaded sleeves 18 are driven to move toward or away from each other. When the threaded sleeve 18 moves, it is convenient to cooperate with the connecting plate 19 to drive the two sliding plates 20 to move toward or away from each other, thereby facilitating the movement of the limit rack 9.

[0037] For details, please refer to Figure 8Two springs 27 are fixedly connected to the inner wall at the top of the groove 26, and the two springs 27 are fixedly connected to the contact block 16. The springs 27 in the groove 26 are convenient for supporting the contact block 16, thereby conveniently driving the contact block 16 to be pressed tightly in the adjustment seat 6.

[0038] Embodiment 2 Based on Example 1, this example introduces a specific structure of a prism 14 in a grinding wheel dresser for a grinding machine. Fig. 9 As shown, the inner wall of the groove 26 is fixedly connected with a fixing rod 28, and the outer wall of the fixing rod 28 is slidably connected with two symmetrically arranged sliding sleeves 30, the outer walls of the two sliding sleeves 30 are rotatably connected with connecting rods 31, and one end of the two connecting rods 31 is rotatably connected to the contact block 16, and the outer wall of the fixing rod 28 is sleeved with two symmetrically arranged springs 29, and the two sliding sleeves 30 are driven to move toward each other by the springs 29, so as to facilitate the contact block 16 to be pressed into the adjustment seat 6 through the connecting rod 31.

[0039] Working principle: When in use, the adjustment component 2 is installed on the grinding machine through the base 1, and then the dressing component 3 is installed on the adjustment seat 6. When the dressing component 3 is installed, the dressing stone body 12 is first inserted into the prism groove 10 through the prism 14, and then the dressing stone body 12 is pressed down with force, and then the rotating disk 13 is rotated to drive the worm 32 to rotate. When the worm 32 rotates, it directly drives the screw 24 to rotate through the worm wheel 23. When the screw 24 rotates, it directly drives the trapezoidal block 25 to move. When the trapezoidal block 25 moves downward, it directly drives the two limit blocks 15 to extend. When the limit blocks 15 extend, they are directly inserted into the limit grooves 11, so as to facilitate the fixing of the dressing stone body 12 on the adjustment seat 6; When the position of the dressing stone body 12 needs to be adjusted, the adjusting seat 6 is directly moved on the base 1. When the adjusting seat 6 moves to the specified position, the rotating part 7 is rotated. When the rotating part 7 rotates, it directly drives the bidirectional screw 17 to rotate. When the bidirectional screw 17 rotates, it drives the two threaded sleeves 18 to move toward or away from each other. When the two threaded sleeves 18 move toward each other, they directly push the two sliding plates 20 to move away from each other through the connecting plate 19. The two sliding plates 20 drive the two driving seats 22 to drive the limit racks 9 and the tooth grooves 5 to engage, thereby facilitating the fixing of the adjusting seat 6 on the base 1. When the prism 14 moves downward, it directly drives the contact block 16 to compress the spring 1 27, thereby facilitating the pressing of the prism 14, or drives the two sliding sleeves 30 to move away from each other through the contact block 16 through the connecting rod 31. When the sliding sleeves 30 move away from each other, they directly compress the spring 2 29.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A grinding wheel dresser for a grinding machine, comprising a base (1), characterized in that: An adjustment component (2) is slidably mounted on the top outer wall of the base (1), and a trimming component (3) is mounted on the top outer wall of the adjustment component (2); the adjustment component (2) comprises an adjustment seat (6), and a prism groove (10) is provided on the top outer wall of the adjustment seat (6); both inner walls of the prism groove (10) are provided with limiting grooves (11); the trimming component (3) comprises a trimming stone body (12), and a prism (14) is fixedly connected to the bottom outer wall of the trimming stone body (12); the specifications of the prism (14) match those of the prism groove (10).

2. The grinding wheel dresser according to claim 1, characterized in that: The prism (14) has an installation cavity formed inside, and the inner walls on both sides of the installation cavity have rectangular openings, the inner walls of the two rectangular openings are slidably connected to limit blocks (15), and the specifications of the limit blocks (15) match those of the limit grooves (11).

3. A grinding wheel dresser for a grinding machine according to claim 2, characterized in that: A driving cavity communicating with the mounting cavity is provided inside the dressing stone body (12), and a trapezoidal block (25) is slidably connected between the mounting cavity and the driving cavity. Driving grooves are provided on both side outer walls of the trapezoidal block (25), and one end of two limit blocks (15) are slidably connected to the inner walls of the two driving grooves, respectively.

4. The grinding wheel dresser according to claim 3, characterized in that: The installation cavity and the driving cavity are rotatably connected by a same screw rod (24), a thread groove is formed on the top outer wall of the trapezoidal block (25), and the screw rod (24) is screwed onto the inner wall of the thread groove.

5. The grinding wheel dresser of a grinding machine according to claim 4, characterized in that: One end of the screw (24) is fixedly connected to a worm wheel (23), and the inner walls on both sides of the drive chamber are rotatably connected to a worm (32), the worm (32) and the worm wheel (23) are meshed with each other, the outer wall of the dressing stone body (12) is provided with a circular groove, and the inner wall of the circular groove is rotatably connected to a rotating disk (13), and one end of the transmission shaft of the rotating disk (13) is fixedly connected to the worm (32).

6. The grinding wheel dresser of a grinding machine according to claim 5, characterized in that: The bottom outer wall of the adjustment seat (6) is fixedly connected to two symmetrically arranged sliding seats (8), and the outer walls of the two sliding seats (8) on the separated sides are each provided with an L-shaped groove (21), and the inner walls of the two L-shaped grooves (21) are both slidably connected to a limit rack (9), the top outer wall of the base (1) is provided with two symmetrically arranged sliding grooves (4), and the inner walls of one side of the two sliding grooves (4) are provided with a plurality of tooth grooves (5) distributed at equal distances, and the sliding seat (8) is slidably connected to the inner wall of the sliding groove (4).

7. The grinding wheel dresser of a grinding machine according to claim 6, characterized in that: The inner walls of the two L-shaped grooves (21) are slidably connected to a driving seat (22), and the two driving seats (22) are fixedly connected to two limit racks (9). The outer wall of one side of the adjustment seat (6) is rotatably connected to a rotating part (7).

8. The grinding wheel dresser of a grinding machine according to claim 7, characterized in that: The inner walls of both sides of the adjustment seat (6) are rotatably connected to the same bidirectional screw (17), and the outer walls of the bidirectional screw (17) are both screwed with threaded sleeves (18), the outer walls of the two threaded sleeves (18) are rotatably connected to two symmetrically arranged connecting plates (19), the inner wall of the adjustment seat (6) is slidably connected to two sliding plates (20), the four connecting plates (19) are respectively rotatably connected to the two sliding plates (20), the two driving seats (22) are respectively fixedly connected to the two sliding plates (20), the transmission shaft of the rotating part (7) is fixedly connected to the bidirectional screw (17), the outer wall of the bottom of the prism (14) is provided with a groove (26), and the inner wall of the groove (26) is slidably connected to a contact block (16).

9. The grinding wheel dresser of a grinding machine according to claim 8, characterized in that: Two springs 1 (27) are fixedly connected to the inner wall at the top of the groove (26), and the two springs 1 (27) are fixedly connected to the contact block (16).

10. The grinding wheel dresser of a grinding machine according to claim 8, characterized in that: The inner wall of the groove (26) is fixedly connected to a fixing rod (28), and the outer wall of the fixing rod (28) is slidably connected to two symmetrically arranged sliding sleeves (30), the outer walls of the two sliding sleeves (30) are rotatably connected to connecting rods (31), and one end of the two connecting rods (31) is rotatably connected to the contact block (16), and the outer wall of the fixing rod (28) is sleeved with two symmetrically arranged springs (29).

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