A laser welding fixture for a medical device cutting blade

Abstract

This invention relates to the field of laser welding fixture technology, and discloses a laser welding fixture for a medical device cutting blade, comprising: a stage, with a thick protruding base integrally provided at each of the four corners of the stage; flat pressure grooves are formed on the surface of the bases on both sides of the middle of the stage; a first pressure sliding member and a second pressure sliding member are slidably disposed inside the two pressure grooves respectively; a first pressure plate is rotatably disposed in the middle of the second pressure sliding member; a second pressure plate is rotatably disposed on the base on one side of the end of the stage; and two placement grooves are formed side by side on the surface of the stage, with the cutting blade workpiece placed inside the placement grooves. This laser welding fixture for a medical device cutting blade solves the problem that in the existing technology, most medical device cutting blades are fixed using complex structures, which consume a lot of time and result in low production efficiency during mass production.

Description

Technical Field

[0001] This invention relates to the field of laser welding fixture technology, specifically to a laser welding fixture for a medical device cutting blade. Background Technology

[0002] In the laser welding process, the laser welding fixture is mainly used to fix the workpiece to be welded and to allow it to be repeatedly loaded, unloaded and repositioned to facilitate automatic laser welding. Therefore, the fixture is one of the essential pieces of equipment in laser welding production. Especially in mass production, whether the fixture is designed properly will directly affect the production efficiency and yield.

[0003] Because the laser spot diameter is very small and the heat-affected area is small, the flatness and precision requirements for the alignment of the weld joint are very high. In the existing technology, when welding the blade head and the shank of the medical device cutting knife, it is necessary to ensure the bridging accuracy and the straightness between the blade head and the shank. The precision requirements are very high. In addition, since the medical device cutting knife is a workpiece that needs to be mass-produced, it is necessary to ensure its production efficiency. In the current technology, most of them use complex structures for fixation, and the fixation process takes a lot of time. Therefore, a targeted auxiliary laser welding fixture is needed to ensure the production progress of the medical device cutting knife. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a laser welding fixture for medical device cutting blades, solving the problems mentioned in the background.

[0005] This invention provides the following technical solution: a laser welding fixture for a medical device cutting blade, comprising: a stage, wherein a thick protruding base is integrally provided at each of the four corners of the stage, and flat pressure grooves are formed on the surface of the bases on both sides of the middle of the stage; a first pressure sliding member and a second pressure sliding member are slidably disposed inside the two flat pressure grooves respectively; a first pressure plate is rotatably disposed in the middle of the second pressure sliding member; a second pressure plate is rotatably disposed on the base on one side of the end of the stage; and two placement grooves are formed side by side on the surface of the stage. The workpiece with a cutting blade is placed on the platform. A positioning groove is opened on the surface of the platform. The positioning groove is located at the end of the placement groove. A loading plate is integrally provided on the inner wall of the positioning groove. A locking block is provided on the side of the loading plate. A light-transmitting slit is opened on the surface of the platform. The light-transmitting slit separates the placement groove and the loading plate. Two cylinder mechanisms are fixedly installed at the bottom of the platform. The two cylinder mechanisms are respectively located below the first pressure plate and the second pressure plate. The tops of the two cylinder mechanisms pass through the platform and are respectively connected to fasteners through the first pressure plate and the second pressure plate.

[0006] Preferably, the middle part of the platform is recessed, and the position and shape of the recess correspond to the position and shape of the first pressure plate and the second pressure plate, respectively.

[0007] Preferably, the ends of the first pressure plate and the second pressure plate that are close to each other are both sloped, and the end of the second pressure plate that is close to the first pressure plate is integrally provided with a protruding pressure block, and the position of the protruding pressure block corresponds to the position of the loading plate.

[0008] Preferably, the cutting tool workpiece includes a tool shank, which is integrally embedded inside the mounting groove. A limiting groove is formed in the middle of the tool shank. A welding head is integrally provided at one end of the tool shank. A cutting head is spliced ​​on the surface of the welding head. A welding groove is formed on the side of the cutting head. The shape of the inner wall of the welding groove is adapted to the shape of the welding head. A cutting arm is provided on both sides of the cutting head. The cutting arm is engaged in the side gap of the loading plate.

[0009] Preferably, a positioning block is engaged inside the limiting groove. The positioning block is integrally set at the bottom of the inner wall of the placement groove. There are two positioning blocks, and the two positioning blocks are located at the two ends of the inner wall of the limiting groove. The shape of the loading plate corresponds to the shape of the joint of the limiting groove.

[0010] Preferably, the bottom of the inner wall of the placement groove protrudes outward near the loading plate, the shape of the protruding part of the inner wall of the placement groove matches the shape of the joint of the loading plate, and is separated from the loading plate by a light-transmitting slit, and a support block is integrally provided at the bottom of the protruding part of the inner wall of the placement groove.

[0011] Preferably, the first pressure plate includes a plate body, one side of which is rotatably connected to the second pressure sliding member via an adapter arm, and the other side of the plate body is integrally provided with a support arm, the position of which is symmetrical with respect to the position of the adapter arm about the center of the plate body. A tensioning hole is provided in the middle of the plate body, and the fastener is provided inside the tensioning hole.

[0012] Preferably, the bottom of the plate is provided with a convex pressure strip, the position of the pressure strip corresponds to the position of the placement groove, and the size of the pressure strip corresponds to the size of the inner wall of the placement groove. The surface of the pressure strip is provided with a positioning hole, the inner wall of the positioning hole penetrates the plate, and the inner wall of the positioning hole is inserted into the surface of the positioning block. The end of the pressure strip near the second pressure plate is provided with a convex shape.

[0013] Preferably, the flat pressing groove includes an inner pressing groove, the inner wall of the inner pressing groove has a sliding groove on its side, and the bottom of the inner wall of the inner pressing groove has a circular groove; the first pressing sliding member includes a lower pressing member, both sides of the lower pressing member are integrally provided with sliding strips that are slidably connected to the inner wall of the sliding groove, the surface of the lower pressing member has a pressing groove, the inner wall of the pressing groove overlaps with the side protruding end of the first pressing plate, the bottom of the lower pressing member is fixedly provided with a limiting rod, the position of the limiting rod corresponds to the position of the circular groove, the surface of the limiting rod is sleeved with a compression spring, and the bottom of the compression spring is located at the bottom of the inner wall of the circular groove.

[0014] Preferably, the fastener includes a first fastener body and a second fastener body, which can be spliced ​​into a ring-shaped component. The splicing surface of the second fastener body has an insertion hole, and an insertion rod is inserted into the inner wall of the insertion hole. The insertion rod is fixedly disposed on the splicing surface of the first fastener body. The piston rod of the cylinder mechanism has a fastening groove on its side near the top, and the inner wall of the fastening groove matches the inner ring after the first fastener body and the second fastener body are spliced.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The laser welding fixture for this medical device cutting blade places the cutting blade workpiece in a contoured placement groove and a positioning groove. The workpiece is then joined together according to the specially designed shape of the placement groove and positioning groove, ensuring the precision requirements of the cutting blade workpiece during welding. Subsequently, the first and second pressure plates are used to press the blade shank and the cutting blade head respectively, fixing them at the welding position. At the same time, the straightness of the cutting blade workpiece splicing can be pressed and corrected, achieving the effect of quickly aligning the weld joint. The clamping process is simple and quick, effectively ensuring its production efficiency.

[0017] 2. The laser welding fixture for the medical device cutting blade is based on the fact that the blade itself is formed by stacking multiple rods. By opening a flat pressure groove and setting a first pressure sliding member, when the first pressure sliding member flips and presses against the blade, it can be suspended above the blade, avoiding misalignment caused by sudden contact. Then, the piston rod of the cylinder mechanism passes through the first pressure sliding member and engages with a fastener. The cylinder mechanism is then activated to press down, so that the first pressure sliding member presses against the blade while suspended, ensuring the stability of its stacking and making the blades arranged side by side in the two placement grooves receive balanced force, further improving the product qualification rate. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the structure during the placement of the workpiece by the cutting blade of the present invention;

[0020] Figure 3 This is a schematic diagram of the workpiece structure of the cutting tool of the present invention.

[0021] Figure 4 This is a top view of the surface structure of the stage of the present invention;

[0022] Figure 5 For the present invention Figure 4 Enlarged structural diagram at point A in the middle;

[0023] Figure 6 This is a bottom view of the bottom structure of the platform of the present invention;

[0024] Figure 7 This is a schematic cross-sectional view of the pressure groove of the platform in this invention.

[0025] Figure 8 For the present invention Figure 7 Enlarged structural diagram at point A in the middle;

[0026] Figure 9 This is a schematic diagram of the side cross-section of the first pressure plate of the present invention;

[0027] Figure 10 This is a schematic diagram of the fastener structure of the present invention.

[0028] In the diagram: 1. Stage; 2. Flat pressure groove; 21. Inner pressure groove; 22. Sliding groove; 23. Circular groove; 3. First pressure sliding component; 31. Lower pressure component; 32. Pressing groove; 33. Limiting rod; 34. Compression spring; 4. Second pressure sliding component; 5. First pressure plate; 51. Plate body; 52. Tensioning hole; 53. Pressure rib; 54. Positioning hole; 55. Support arm; 6. Second pressure plate; 7. Cylinder mechanism; 8. Mounting groove; 9. 91. Cutting blade workpiece; 92. Blade holder; 93. Limiting groove; 94. Welding head; 95. Cutting blade head; 96. Welding groove; 10. Blade arm; 11. Protruding pressure block; 12. Positioning block; 13. Positioning groove; 14. Loading plate; 15. Locking block; 16. Light-transmitting slit; 17. Support block; 17. Fastener; 171. First fastener body; 172. Second fastener body; 173. Insertion hole; 174. Insertion rod; 18. Fastener groove. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Please see Figure 1-10A laser welding fixture for a medical device cutting blade includes: a stage 1, with a thick protruding base integrally formed at each of the four corners of the stage 1; flat pressure grooves 2 are formed on the surface of the base on both sides of the middle of the stage 1; a first pressure sliding member 3 and a second pressure sliding member 4 are slidably arranged inside the two flat pressure grooves 2 respectively; a first pressure plate 5 is rotatably arranged in the middle of the second pressure sliding member 4; a second pressure plate 6 is rotatably arranged on the base on one side of the end of the stage 1; and two placement grooves 8 are formed side by side on the surface of the stage 1, with the cutting blade workpiece 9 placed inside the placement grooves 8. A positioning groove 12 is provided on the surface of the platform 1. The positioning groove 12 is located at the end of the placement groove 8. A loading plate 13 is integrally provided on the inner wall of the positioning groove 12. A locking block 14 is provided on the side of the loading plate 13. A light-transmitting slit 15 is provided on the surface of the platform 1. The light-transmitting slit 15 divides the placement groove 8 and the loading plate 13. Two cylinder mechanisms 7 are fixedly installed at the bottom of the platform 1. The two cylinder mechanisms 7 are located below the first pressure plate 5 and the second pressure plate 6, respectively. The tops of the two cylinder mechanisms 7 penetrate the platform 1 and pass through the first pressure plate 5 and the second pressure plate 6, respectively, and are fitted with fasteners 17.

[0031] The middle part of the stage 1 is recessed, and the position and shape of the recess correspond to the position and shape of the first pressure plate 5 and the second pressure plate 6, respectively. When the first pressure plate 5 and the second pressure plate 6 are flipped and pressed down, the recessed position allows the first pressure plate 5 and the second pressure plate 6 to be pressed in, effectively utilizing the space on the stage 1 and facilitating the operation of the laser welding device.

[0032] The ends of the first pressure plate 5 and the second pressure plate 6 that are close to each other are both sloping. The end of the second pressure plate 6 that is close to the first pressure plate 5 is integrally provided with a protruding pressure block 10, and the position of the protruding pressure block 10 corresponds to the position of the loading plate 13. The thinnest part of the slope is located at the welding position of the cutting blade workpiece 9, so that the laser welding device can be directly aligned with the welding position of the cutting blade workpiece 9. At the same time, without affecting the welding, the cutting blade workpiece 9 is pressed to the maximum extent to ensure that it is in a flat state.

[0033] The cutting tool workpiece 9 includes a tool shank 91, which is embedded inside the mounting groove 8. A limiting groove 92 is provided in the middle of the tool shank 91. A welding head 93 is integrally provided at one end of the tool shank 91. A cutting head 94 is spliced ​​on the surface of the welding head 93. A welding groove 95 is provided on the side of the cutting head 94. The shape of the inner wall of the welding groove 95 is adapted to the shape of the welding head 93. Both sides of the cutting head 94 are provided with a tool arm 96, which is engaged in the side gap of the loading plate 13. According to the shape of the cutting tool workpiece 9, the mounting groove 8 and the positioning groove 12 on the platform 1 can quickly splice the cutting head 94 and the tool shank 91, so as to quickly align the weld joint. The clamping process is simple and quick, effectively ensuring its production efficiency.

[0034] The limiting groove 92 is internally fitted with a positioning block 11. The positioning block 11 is integrally set at the bottom of the inner wall of the placement groove 8. There are two positioning blocks 11, and the two positioning blocks 11 are located at the two ends of the inner wall of the limiting groove 92 respectively. The shape of the loading plate 13 corresponds to the shape of the splice of the limiting groove 92. The positioning blocks 11 are used to stack and fix the tool bars 91 that need to be stacked in sequence, so that they have a certain degree of stability after stacking, and avoid misalignment when the first pressure sliding part 3 is used for covering.

[0035] Among them, the bottom of the inner wall of the placement groove 8 protrudes outward near the loading plate 13. The shape of the protruding part of the inner wall of the placement groove 8 matches the shape of the joint of the loading plate 13, and is separated from the loading plate 13 by the light-transmitting slit 15. The bottom of the protruding part of the inner wall of the placement groove 8 is integrally provided with a support block 16. The protruding part is used to support the welding part of the cutting blade workpiece 9, so as to ensure that the welding part of the cutting blade workpiece 9 has sufficient stability and the forming accuracy is guaranteed.

[0036] The first pressure plate 5 includes a plate body 51. One side of the plate body 51 is rotatably connected to the second pressure sliding member 4 via an adapter arm. The other side of the plate body 51 is integrally provided with a support arm 55. The position of the support arm 55 and the position of the adapter arm are symmetrical about the center of the plate body 51. A tensioning hole 52 is provided in the middle of the plate body 51. The fastener 17 is provided inside the tensioning hole 52. The support arm 55 and the adapter arm bear the weight of the plate body 51, so that the plate body 51 will not directly press on the cutting blade workpiece 9 when it is flipped, thereby avoiding the sudden pressure and displacement of the stacked part of the cutting blade workpiece 9.

[0037] The bottom of the plate 51 is provided with a protruding pressure strip 53. The position of the pressure strip 53 corresponds to the position of the mounting groove 8, and the size of the pressure strip 53 corresponds to the size of the inner wall of the mounting groove 8. The surface of the pressure strip 53 is provided with a positioning hole 54. The inner wall of the positioning hole 54 penetrates the plate 51 and is inserted into the surface of the positioning block 11. The end of the pressure strip 53 near the second pressure plate 6 is provided with a protruding shape. The pressure strip 53 completely covers one end of the cutting blade workpiece 9 at the welding point, so that only the welding part of the cutting blade workpiece 9 is exposed to the laser welding device, which protects it and prevents the laser from leaving marks on the surface of the cutting blade workpiece 9 other than the welding point.

[0038] The flat pressure groove 2 includes an inner pressure groove 21, with a sliding groove 22 on the side of the inner wall of the inner pressure groove 21 and a circular groove 23 at the bottom of the inner wall of the inner pressure groove 21. The first pressure sliding member 3 includes a lower pressure member 31, with sliding strips integrally provided on both sides of the lower pressure member 31 and slidingly connected to the inner wall of the sliding groove 22. A pressing groove 32 is provided on the surface of the lower pressure member 31, and the inner wall of the pressing groove 32 overlaps with the side protruding end of the first pressure plate 5. A limiting rod 33 is fixedly provided at the bottom of the lower pressure member 31, and the position of the limiting rod 33 corresponds to the position of the circular groove 23. A compression spring 34 is sleeved on the surface of the limiting rod 33, and the bottom of the compression spring 34 is located at the bottom of the inner wall of the circular groove 23. By providing the compression spring 34, when the first pressure plate 5 is flipped down, it is suspended above the cutting blade workpiece 9, avoiding direct pressing on the cutting blade workpiece 9 and causing misalignment at the stacking point.

[0039] The fastener 17 includes a first fastener body 171 and a second fastener body 172, which can be spliced ​​into a ring-shaped component. The splicing surface of the second fastener body 172 is provided with an insertion hole 173, and an insertion rod 174 is inserted into the inner wall of the insertion hole 173. The insertion rod 174 is fixedly set on the splicing surface of the first fastener body 171. The piston rod of the cylinder mechanism 7 is provided with a fastening groove 18 on the side near the top. The inner wall of the fastening groove 18 matches the inner ring after the first fastener body 171 and the second fastener body 172 are spliced. By fitting the fastener 17 into the fastening groove 18, the cylinder mechanism 7 can directly use the fastener 17 to pull the first pressure plate 5 and the second pressure plate 6 when it is running, so that the first pressure plate 5 and the second pressure plate 6 can be quickly pressed and fixed, which improves the efficiency of clamping the workpiece.

[0040] Working principle: When using a jig to clamp the medical device cutting blade, firstly, open the first pressure plate 5 and the second pressure plate 6, place the cutting blade workpiece 9 inside the placement groove 8 and positioning groove 12 provided above the stage 1, and quickly assemble it according to the contoured inner wall. Then, flip the first pressure plate 5 and the second pressure plate 6 so that the first pressure plate 5 and the second pressure plate 6 press on the cutting blade workpiece 9. At this time, under the support of the first pressure sliding member 3 and the second pressure sliding member 4, the first pressure plate 5 will be slightly suspended above the cutting blade workpiece 9. Then, start the cylinder mechanism 7 to raise the piston rod of the cylinder mechanism 7 located below the first pressure plate 5 and the second pressure plate 6 respectively. After the fastener 17 is sleeved on the piston rod, start the cylinder mechanism 7 again so that the piston rod of the cylinder mechanism 7 drives the fastener 17 to press down, ensuring that the first pressure plate 5 and the second pressure plate 6 stably cover the cutting blade workpiece 9, and then laser welding can be performed.

[0041] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A laser welding fixture for a medical device cutting blade, characterized in that, include: A platform (1) is provided with a base with a thick protrusion at each of its four corners. Flat pressure grooves (2) are provided on the surface of the base on both sides of the middle of the platform (1). A first pressure sliding member (3) and a second pressure sliding member (4) are slidably disposed inside the two pressure sliding members (2). A first pressure plate (5) is rotatably disposed in the middle of the second pressure sliding member (4). A second pressure plate (6) is rotatably disposed on the base on one side of the end of the platform (1). Two placement grooves (8) are provided side-by-side on the surface of the platform (1). A cutting tool workpiece (9) is placed inside the placement groove (8). A positioning groove (12) is provided on the surface of the platform (1). The positioning groove (12) is located at the end of the placement groove (8). The inner wall of the positioning groove (12) is integrally provided with a loading plate (13). The side of the loading plate (13) is provided with a locking block (14). The surface of the platform (1) is provided with a light-transmitting slit (15). The light-transmitting slit (15) divides the placement groove (8) and the loading plate (13). Two cylinder mechanisms (7) are fixedly installed at the bottom of the platform (1). The two cylinder mechanisms (7) are located below the first pressure plate (5) and the second pressure plate (6) respectively. The tops of the two cylinder mechanisms (7) penetrate the platform (1) and pass through the first pressure plate (5) and the second pressure plate (6) respectively to be fitted with fasteners (17). The flat pressure groove (2) includes an inner pressure groove (21), a sliding groove (22) is provided on the side of the inner wall of the inner pressure groove (21), and a circular groove (23) is provided at the bottom of the inner wall of the inner pressure groove (21). The first pressing component (3) includes a lower pressing component (31). Both sides of the lower pressing component (31) are integrally provided with sliding strips that are slidably connected to the inner wall of the sliding groove (22). The surface of the lower pressing component (31) is provided with a pressing groove (32). The inner wall of the pressing groove (32) overlaps with the side protruding end of the first pressing plate (5). The bottom of the lower pressing component (31) is fixedly provided with a limiting rod (33). The position of the limiting rod (33) corresponds to the position of the circular groove (23). The surface of the limiting rod (33) is sleeved with a compression spring (34). The bottom of the compression spring (34) is located at the bottom of the inner wall of the circular groove (23).

2. The laser welding fixture for a medical device cutting blade according to claim 1, characterized in that, The middle part of the platform (1) is recessed, and the position and shape of the recess correspond to the position and shape of the first pressure plate (5) and the second pressure plate (6), respectively.

3. The laser welding fixture for a medical device cutting blade according to claim 1, characterized in that, The ends of the first pressure plate (5) and the second pressure plate (6) that are close to each other are both sloping. The second pressure plate (6) has a protruding pressure block (10) integrally provided at one end close to the first pressure plate (5), and the position of the protruding pressure block (10) corresponds to the position of the loading plate (13).

4. The laser welding fixture for a medical device cutting blade according to claim 1, characterized in that, The cutting tool workpiece (9) includes a tool bar (91), which is embedded in the placement groove (8). A limiting groove (92) is opened in the middle of the tool bar (91). A welding head (93) is integrally provided at one end of the tool bar (91). A cutting head (94) is spliced ​​on the surface of the welding head (93). A welding groove (95) is opened on the side of the cutting head (94). The shape of the inner wall of the welding groove (95) is adapted to the shape of the welding head (93). A cutting arm (96) is provided on both sides of the cutting head (94). The cutting arm (96) is engaged in the side gap of the loading plate (13).

5. The laser welding fixture for a medical device cutting blade according to claim 4, characterized in that, The limiting groove (92) is fitted with a positioning block (11), which is integrally set at the bottom of the inner wall of the placement groove (8). There are two positioning blocks (11), and the two positioning blocks (11) are located at the two ends of the inner wall of the limiting groove (92). The shape of the loading plate (13) corresponds to the shape of the joint of the limiting groove (92).

6. The laser welding fixture for a medical device cutting blade according to claim 1, characterized in that, The bottom of the inner wall of the placement groove (8) protrudes outward from the end near the loading plate (13). The shape of the protruding part of the inner wall of the placement groove (8) matches the shape of the docking part of the loading plate (13), and is separated from the loading plate (13) by a light-transmitting slit (15). A support block (16) is integrally provided at the bottom of the protruding part of the inner wall of the placement groove (8).

7. The laser welding fixture for a medical device cutting blade according to claim 1, characterized in that, The first pressure plate (5) includes a plate body (51). One side of the plate body (51) is rotatably connected to the second pressure sliding member (4) through an adapter arm. The other side of the plate body (51) is integrally provided with a support arm (55). The position of the support arm (55) and the position of the adapter arm are symmetrical about the center of the plate body (51). A tensioning hole (52) is opened in the middle of the plate body (51). The fastener (17) is disposed inside the tensioning hole (52).

8. The laser welding fixture for a medical device cutting blade according to claim 7, characterized in that, The bottom of the plate (51) is provided with a convex pressure strip (53). The position of the pressure strip (53) corresponds to the position of the mounting groove (8), and the size of the pressure strip (53) corresponds to the size of the inner wall of the mounting groove (8). The surface of the pressure strip (53) is provided with a positioning hole (54). The inner wall of the positioning hole (54) penetrates the plate (51). The inner wall of the positioning hole (54) is inserted into the surface of the positioning block (11). The end of the pressure strip (53) near the second pressure plate (6) is provided in a convex shape.

9. The laser welding fixture for a medical device cutting blade according to claim 1, characterized in that, The fastener (17) includes a first fastener body (171) and a second fastener body (172). The first fastener body (171) and the second fastener body (172) can be spliced ​​into a ring component. The splicing surface of the second fastener body (172) is provided with an insertion hole (173). An insertion rod (174) is inserted into the inner wall of the insertion hole (173). The insertion rod (174) is fixedly set on the splicing surface of the first fastener body (171). The piston rod of the cylinder mechanism (7) is provided with a fastening groove (18) on the side near the top. The inner wall of the fastening groove (18) matches the inner ring after the first fastener body (171) and the second fastener body (172) are spliced.

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