A micro PCD drill bit welding clamping device

Abstract

The application relates to a micro PCD drill bit welding clamping device, belonging to the technical field of drill bit clamping, which comprises a base, a sliding block and a fixed block. The base is provided with a sliding groove. The sliding block and the base are respectively located in the sliding groove and oppositely arranged. The sliding block is in sliding fit with the sliding groove. One side of the fixed block close to the sliding block is provided with a rotating part one capable of rotating around an axis of the rotating part one. One side of the sliding block close to the fixed block is provided with a rotating part two also capable of rotating around an axis of the rotating part two. One side of the rotating part one close to the rotating part two is provided with a mounting hole one. One side of the rotating part two close to the rotating part one is provided with a mounting hole two. The mounting hole one is coaxial with the mounting hole two. The micro PCD drill bit welding clamping device has the effect of reducing the coaxiality error of the drill head and the drill shank during welding.

Description

Technical Field

[0001] This application relates to the field of drill bit clamping, and in particular to a micro PCD drill bit welding clamping device. Background Technology

[0002] Conventional drill bits are often made of high-speed steel in one piece and then machined and ground to become finished products. PCD drill bits, on the other hand, are made of tungsten steel, which has better wear resistance and strength than drill bits made of high-speed steel. Micro PCD drill bits refer to drill bits with a drill bit diameter of less than 3.175mm.

[0003] Currently, in order to save on the cost of producing PCD drill bits, the cutting head and the shank are often produced separately. The cutting head is made of tungsten steel, while the shank is usually made of conventional carbon steel. When welding the cutting head and the shank, a fitting hole of the same size as the cutting head diameter is usually first made on the carbon steel shank. Then the cutting head is inserted into the fitting hole on the shank, and finally the junction of the cutting head and the shank is welded.

[0004] Because of the small diameter of the micro PCD drill bit, the precision requirements for drilling the precision holes on the tool holder are high. Drilling precision holes on every tool holder would increase production costs. Therefore, the diameter of the insertion hole on the tool holder is often slightly larger than the diameter of the drill bit so that the drill bit can be smoothly inserted and subsequently welded.

[0005] However, existing fixtures often only clamp the tool holder when welding the cutter head to the tool holder, without clamping or fixing the cutter head after it is inserted into the insertion hole on the tool holder. Since the diameter of the insertion hole on the tool holder is slightly larger than the outer diameter of the cutter head, the axis of the cutter head is prone to deviate from the axis of the tool holder after it is inserted into the insertion hole. That is, the coaxiality error between the cutter head and the tool holder becomes larger, which affects the finished quality of the miniature PCD drill bit. Summary of the Invention

[0006] To reduce the coaxiality error between the drill bit and the shank during welding, this application provides a miniature PCD drill bit welding clamping device.

[0007] The miniature PCD drill bit welding clamping device provided in this application adopts the following technical solution:

[0008] The device includes a base, a sliding block, and a fixed block. The base has a sliding groove, and the sliding block and the base are respectively located in the sliding groove and arranged opposite to each other. The sliding block slides in conjunction with the sliding groove. The fixed block has a rotating component one that can rotate around its own axis on the side near the sliding block. The sliding block has a rotating component two that can also rotate around its own axis on the side near the fixed block. The rotating component one has a mounting hole one on the side near the rotating component two, and the rotating component two has a mounting hole two on the side near the rotating component one. The mounting hole one and the mounting hole two are coaxial.

[0009] By adopting the above technical solution, the sliding groove prevents the sliding block from easily shifting direction as it moves towards the fixed block. During welding, the tool holder is first inserted into mounting hole one on rotating part one, and then the tool tip is inserted into mounting hole two on rotating part two. Both mounting holes one and two are precision holes, which results in a smaller coaxiality error between the tool holder and mounting hole one after insertion into mounting hole one, and a smaller coaxiality error between the tool tip and mounting hole two after insertion into mounting hole two. Then, the sliding block is pushed to move towards the fixed block within the sliding groove. Since mounting holes one and two are coaxial, the sliding block is located within the mounting hole... The tool holder in hole one and the tool head in hole two are also in a coaxial state. As the tool head and tool holder approach each other, the tool head is inserted into the tool holder. When welding the connection between the tool head and the tool holder, the rotation of the rotating part around its own axis drives the tool holder to rotate, and then welding is carried out. Since at least one point of the connection between the tool head and the tool holder has been welded, the rotation of the tool holder will drive the tool head to rotate, thereby completing the circumferential welding of the connection between the tool holder and the tool head. During the welding process between the tool head and the tool holder, the positions of the tool head and the tool holder are relatively fixed, thereby achieving the effect of reducing the coaxiality error when welding the tool head and the tool holder.

[0010] Optionally, the two sides of the sliding groove form a V-shaped surface. Both the fixed block and the sliding block are cylinders with the same outer diameter. The outer wall of the fixed block is tangent to the two sides of the sliding groove, and the outer wall of the sliding block is also tangent to the two sides of the sliding groove.

[0011] By adopting the above technical solution, when the fixed block and the sliding block are placed in the sliding groove, both the fixed block and the sliding block are cylinders with the same outer diameter. This makes the fixed block and the sliding block coaxial when they are in the sliding groove, thereby achieving the coaxiality of mounting hole one and mounting hole two, and ensuring the coaxiality of the cutter head and the cutter shank.

[0012] Optionally, a rotating shaft is provided at the end of the fixed block away from the sliding block. The rotating shaft is coaxial with the mounting hole. One end of the rotating shaft passes through the fixed block and is inserted into the rotating component. The other end of the rotating shaft is located outside the fixed block and is equipped with a handle. The rotating shaft is used to drive the rotating component to rotate around its own axis.

[0013] By adopting the above technical solution, the fixing block is fixed in the sliding groove. When the rotating shaft rotates, the rotating shaft drives the rotating part with the tool holder inserted on the fixing block to rotate around its own axis, thereby realizing the circumferential rotation of the tool holder when the tool head and the tool holder are welded.

[0014] Optionally, the rotating part is provided with a groove, the groove having a regular hexagonal cross-section, and one end of the rotating shaft located inside the fixed block is inserted into the groove.

[0015] By adopting the above technical solution, the groove is a regular hexagon, which allows the rotating shaft to smoothly drive the rotating part on the fixed block to rotate around its own axis after being inserted into the groove.

[0016] Optionally, the sliding block has a pushing component at the end away from the fixed block. The pushing component includes a locking block, a connector, a push rod, and a mounting base. The mounting base is mounted on the base. The push rod passes through the mounting base and is threadedly connected to the connector. The locking block is fixedly connected to the sliding block. The locking block has a slot. The end of the connector away from the push rod is located in the slot. The connector enables the push rod to push the sliding block to slide back and forth in the sliding slot.

[0017] By adopting the above technical solution, the locking block is fixedly connected to the side of the sliding block away from the fixed block. The locking block is provided with a locking groove, and the connector is located in the groove to realize the connection between the connector and the locking block. The mounting base is installed on the base, and the push rod passes through the mounting base and is threadedly connected to the end of the connector away from the locking block. Since the connection between the connector and the locking block is a flexible connection, even if the installation position of the locking block on the sliding block is offset within a certain range, the push rod can still realize the connection between the push rod and the locking block through the connector, so that the sliding block can reciprocate along the axis of the push rod in the positioning groove.

[0018] Optionally, the sliding block is provided with a connector, and the fixed block is provided with a connector groove that matches the connector, and the connector and the connector groove are engaged.

[0019] By adopting the above technical solution, the sliding block is provided with a connector, and the fixed block is provided with a connector groove that matches the connector. This allows the connector and the connector to engage simultaneously when the cutter head approaches the cutter shank and engages with the cutter shank. The connector on the sliding block and the connector groove on the fixed block serve to check the coaxiality between the fixed block and the sliding block.

[0020] Optionally, a magnet is provided in the socket for attracting the connector.

[0021] By adopting the above technical solution, a magnet is provided in the insertion slot. When the connector is inserted into the insertion slot, the magnet attracts the connector, so that the position of the sliding block will not easily change in the positioning slot when the cutting head and the cutting shank are being welded.

[0022] Optionally, the end of the connector near the sliding block is provided with a threaded rod, which is threadedly engaged with the sliding block.

[0023] By adopting the above technical solution, the operator can adjust the extension length of the connector on the sliding block by rotating the connector, and adjust the distance between the sliding block and the fixed block after the connector is attracted by the magnet, so that the distance between the sliding block and the fixed block can be adapted to different lengths of cutting heads and handles.

[0024] In summary, this application includes at least the following beneficial technical effects:

[0025] 1. By ensuring the coaxiality between mounting hole one on rotating part one and mounting hole two on rotating part two, and by ensuring that both mounting hole one and mounting hole two are precision holes, the coaxiality error of the tool head and the tool holder is small when they are inserted. Furthermore, during welding, since the tool holder and the tool head are clamped by mounting hole one and mounting hole two respectively, their positions will not change significantly, resulting in good stability. This achieves the effect of reducing the coaxiality error between the tool holder and the tool head during welding.

[0026] 2. By setting a threaded rod on the connector that is threaded to the sliding block, the extension length of the connector on the sliding block is adjustable, thereby achieving the effect of adjusting the distance between the sliding block and the fixed block. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of a micro PCD drill bit welding clamping device according to an embodiment of this application;

[0028] Figure 2 yes Figure 1 The main view;

[0029] Figure 3 yes Figure 2 A sectional view;

[0030] Explanation of reference numerals in the attached drawings: 1. Base; 2. Sliding block; 3. Fixing block; 4. Sliding groove; 5. Rotating component one; 6. Rotating component two; 7. Mounting hole one; 8. Mounting hole two; 9. Rotating shaft; 10. Rotating handle; 11. Groove; 12. Pushing assembly; 13. Locking block; 14. Connector; 15. Push rod; 16. Mounting seat; 17. Locking slot; 18. Connector; 19. Connecting groove; 20. Magnet; 21. Threaded rod. Detailed Implementation

[0031] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0032] This application discloses a miniature PCD drill bit welding clamping device, referring to... Figure 1-3 The device includes a base 1, a fixing block 3, and a sliding block 2. A sliding groove 4 is provided on the base 1. A mounting part for installing the fixing block 3 is provided at one end of the sliding groove 4. One end of the fixing block 3 is located inside the mounting part and is inserted into the mounting part. The two sides of the sliding groove 4 form a V-shaped surface. The fixing block 3 and the sliding block 2 are cylinders with the same outer diameter. The fixing block 3 is fixed at one end of the sliding groove 4 and its outer wall is tangent to the two sides of the sliding groove 4. The sliding block 2 is located at the other end of the sliding groove 4 and its outer wall is also tangent to the two sides of the sliding groove 4.

[0033] Fixed block 3 and sliding block 2 are located at opposite ends of sliding groove 4. A cavity is provided on the side of fixed block 3 near sliding block 2, and two bearings are installed in the cavity. A bushing is provided between the two bearings. A rotating part 5 is provided between the inner rings of the bearings. The two ends of the rotating part 5 are respectively transition-fitted with the inner rings of the two bearings in the cavity of fixed block 3, which allows the rotating part 5 to rotate smoothly around its own axis. In order to facilitate the installation between the rotating part 5 and the two bearings, the outer diameter of the part of the rotating shaft 9 located between the two bearings is smaller than the outer diameter of the bearings. Similarly, a cavity and two bearings are also provided on sliding block 2 near fixed block 3. A rotating part 6 is installed on the two bearings on sliding block 2. The two ends of the rotating part 6 are respectively transition-fitted with the inner rings of the two bearings on sliding block 2, which allows the rotating part 6 to rotate around its own axis on sliding block 2. In order to facilitate the installation between the rotating part 6 and the two bearings on sliding block 2, the outer diameter of the part of the rotating part 6 located between the two bearings is also smaller than the outer diameter of the bearings.

[0034] Rotating component 5 and rotating component 6 are located on fixed block 3 and sliding block 2 respectively and arranged opposite to each other. Rotating component 5 has a mounting hole 7 for inserting the tool holder, and rotating component 6 has a mounting hole 8 for inserting the tool tip. Mounting hole 7 and mounting hole 8 are coaxial, and both mounting holes 7 and 8 are precision holes with a machining tolerance of H6. This ensures the coaxiality between the tool holder and mounting hole 7 when inserted into mounting hole 7, and the coaxiality between the tool tip and mounting hole 8 when inserted into mounting hole 8. Consequently, the coaxiality between the tool tip and tool holder during insertion is also guaranteed.

[0035] In order to drive the rotating part 5 to rotate around its own axis on the fixed block 3, so that the circumferential welding of the connection can be completed when the cutter head and the cutter shank are inserted, a groove 11 with a regular hexagonal cross section is provided at the end of the rotating part 5 away from the rotating part 6. The regular hexagonal groove 11 has a wider range of applicability than grooves 11 with other cross sections, which allows the rotating part 5 to be rotated by other common tools such as Allen wrenches in addition to specific tools.

[0036] A rotating shaft 9 is provided at the end of the fixed block 3 away from the sliding block 2. One end of the rotating shaft 9 passes through the fixed block 3 and is inserted into the groove 11 on the rotating component 5. The other end of the rotating shaft 9 is located outside the fixed block 3 and is equipped with a rotating handle 10. When the rotating handle 10 is rotated, causing the rotating shaft 9 to rotate around its own axis, the rotating component 5 rotates synchronously with the rotation of the rotating shaft 9.

[0037] Reference Figure 3A pushing component 12 is provided at the end of the sliding block 2 away from the fixed block 3. The pushing component 12 includes a locking block 13, a connector 14, a push rod 15, and a mounting base 16. The mounting base 16 is fixedly connected to the base 1. The push rod 15 passes through the mounting base 16. The locking block 13 is fixedly connected to the sliding block 2. A locking groove 17 is provided on the locking block 13. One end of the connector 14 is located in the locking groove 17. The other end of the connector 14 is threadedly connected to the push rod 15. The end of the connector 14 located in the locking block 13 forms a limiting boss, which allows the push rod 15 to make the sliding block 2 slide away from the fixed block 3 in the sliding groove 4.

[0038] At the bottom of the sliding block 2, a connector 18 is installed. The connector 18 is made of metal that can be attracted by the magnet 20. The connector 18 is cylindrical. On the fixed block 3, near the sliding block 2, there is a connector groove 19 that fits the connector 18. The magnet 20 is installed in the connector groove 19. When the connector 18 is inserted into the connector groove 19, the connector 18 will be attracted by the magnet 20. Therefore, when the cutting head and the cutting handle are welded, the distance between the fixed block 3 and the sliding block 2 will not easily change.

[0039] Reference Figure 3 A threaded rod 21 is installed at one end of the connector 18 near the sliding block 2. The connector 18 is connected to the sliding block 2 through the threaded rod 21. When it is necessary to adjust the distance between the fixed block 3 and the sliding block 2, the connector 18 can be screwed out of the sliding block 2 by a certain distance, thereby adjusting the distance between the fixed block 3 and the sliding block 2. This allows the fixed block 3 and the sliding block 2 to be used with the same specifications of cutter heads and handles but different lengths. Furthermore, a nut is fitted on the threaded rod 21. When the connector 18 is screwed out, the operator can rotate the nut until the nut is pressed against the end face of the sliding block 2, thereby fixing the extension length of the connector 18.

[0040] The implementation principle of this application embodiment is as follows: First, insert the tool holder into the mounting hole 7 and the tool head into the mounting hole 8. Then, push the sliding block 2 along the length of the sliding groove 4 through the push rod 15, so that the distance between the sliding block 2 and the fixed block 3 gradually decreases until the plug 18 on the sliding block 2 is inserted into the plug groove 19 on the fixed block 3 and abuts against the magnet 20 in the plug groove 19. At this time, the insertion and engagement between the tool head and the tool holder is completed. When the welding between the tool head and the tool holder begins, rotate the handle 10. The handle 10 drives the rotating shaft 9 to rotate around its own axis, which in turn drives the rotating component 5 to rotate. Since the mounting hole 7 is a precision hole, the rotation of the rotating component 5 will drive the tool holder to rotate. Since at least one point of the tool head and the tool holder has been welded at this time, the tool head will drive the rotating component 6 to rotate together after the tool holder rotates, realizing the circumferential welding between the tool head and the tool holder. After the welding between the tool head and the tool holder is completed, stop rotating the rotating shaft 9 and remove the welded tool head and tool holder from between the sliding block 2 and the fixed block 3.

[0041] Furthermore, the fixture provided in this application can also be used on the production line of the corresponding PCD micro drill bit. That is, a cylinder or electric push rod 15 is set at the welding station to push the push rod 15, so that the push rod 15 can push the sliding block 2 towards the fixed block 3 to realize the insertion and engagement between the cutter head and the tool holder. Then, a motor is set to drive the rotating shaft 9 to rotate until the cutter head and the tool holder are welded. Then, the worker removes the welded cutter head and tool holder from the fixture at the next station.

[0042] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A micro PCD drill bit welding fixture, characterized by: The utility model provides a cutting tool, including base (1), sliding block (2) and fixed block (3), be equipped with sliding groove (4) on base (1), sliding block (2) and fixed block (3) are located respectively in sliding groove (4) on and opposite arrangement, sliding block (2) can slide in sliding groove (4), the side of fixed block (3) near sliding block (2) is provided with rotator no.

2. A micro PCD drill bit welding fixture device according to claim 1, wherein: The utility model provides a cutting tool, including base (1), sliding block (2) and fixed block (3), be equipped with sliding groove (4) on base (1), sliding block (2) and fixed block (3) are located respectively in sliding groove (4) on and opposite arrangement, sliding block (2) can slide in sliding groove (4), the side of fixed block (3) near sliding block (2) is provided with rotator no.

3. A micro PCD drill bit welding fixture device as claimed in claim 1, wherein: The utility model provides a cutting tool, including base (1), sliding block (2) and fixed block (3), be equipped with sliding groove (4) on base (1), sliding block (2) and fixed block (3) are located respectively in sliding groove (4) on and opposite arrangement, sliding block (2) can slide in sliding groove (4), the side of fixed block (3) near sliding block (2) is provided with rotator no.

4. A micro PCD drill bit welding clamp apparatus as claimed in claim 3, wherein: The utility model provides a cutting tool, including base (1), sliding block (2) and fixed block (3), be equipped with sliding groove (4) on base (1), sliding block (2) and fixed block (3) are located respectively in sliding groove (4) on and opposite arrangement, sliding block (2) can slide in sliding groove (4), the side of fixed block (3) near sliding block (2) is provided with rotator no. The utility model provides a cutting tool, including base (1), sliding block (2) and fixed block (3), be equipped with sliding groove (4) on base (1), sliding block (2) and fixed block (3) are located respectively in sliding groove (4) on and opposite arrangement, sliding block (2) can slide in sliding groove (4), the side of fixed block (3) near sliding block (2) is provided with rotator no. The utility model provides a cutting tool, including base (1), sliding block (2) and fixed block (3), be equipped with sliding groove (4) on base (1), sliding block (2) and fixed block (3) are located respectively in sliding groove (4) on and opposite arrangement, sliding block (2) can slide in sliding groove (4), the side of fixed block (3) near sliding block (2) is provided with rotator no. The utility model provides a cutting tool, including base (1), sliding block (2) and fixed block (3), be equipped with sliding groove (4) on base (1), sliding block (2) and fixed block (3) are located respectively in sliding groove (4) on and opposite arrangement, sliding block (2) can slide in sliding groove (4), the side of fixed block (3) near sliding block (2) is provided with rotator no. The utility model provides a cutting tool, including base (1), sliding block (2) and fixed block (3), be equipped with sliding groove (4) on base (1), sliding block (2) and fixed block (3) are located respectively in sliding groove (4) on and opposite arrangement, sliding block (2) can slide in sliding groove (4), the side of fixed block (3) near sliding block (2) is provided with rotator no. The utility model provides a cutting tool, including base (1), sliding block (2) and fixed block (3), be equipped with sliding groove (4) on base (1), sliding block (2) and fixed block (3) are located respectively in sliding groove (4) on and opposite arrangement, sliding block (2) can slide in sliding groove (4), the side of fixed block (3) near sliding block (2) is provided with rotator no. The utility model provides a cutting tool, including base (1), sliding block (2) and fixed block (3), be equipped with sliding groove (4) on base (1), sliding block (2) and fixed block (3) are located respectively in sliding groove (4) on and opposite arrangement, sliding block (2) can slide in sliding groove (4), the side of fixed block (3) near sliding block (2) is provided with rotator no. The utility model provides a cutting tool, including base (1), sliding block (2) and fixed block (3), be equipped with sliding groove (4) on base (1), sliding block (2) and fixed block (3) are located respectively in sliding groove (4) on and opposite arrangement, sliding block (2) can slide in sliding groove (4), the side of fixed block (3) near sliding block (2) is provided with rotator no. The utility model provides a cutting tool, including base (1), sliding block (2) and fixed block (3), be equipped with sliding groove (4) on base (1), sliding block (2) and fixed block (3) are located respectively in sliding groove (4) on and opposite arrangement, sliding block (2) can slide in sliding groove (4), the side of fixed block (3) near sliding block (2) is provided with rotator no. The utility model provides a cutting tool, including base (1), sliding block (2) and fixed block (3), be equipped with sliding groove (4) on base (1), sliding block (2) and fixed block (3) are located respectively in sliding groove (4) on and opposite arrangement, sliding block (2) can slide in sliding groove (4), the side of fixed block (3) near sliding block (2) is provided with rotator no. The utility model provides a cutting tool, including base (1), sliding block (2) and fixed block (3), be equipped with sliding groove (4) on base (1), sliding block (2) and fixed block (3) are located respectively in sliding groove (4) on and opposite arrangement, sliding block (2) can slide in sliding groove (4), the side of fixed block (3) near sliding block (2) is provided with rotator no. The utility model provides a cutting tool, including base (1), sliding block (2) and fixed block (3), be equipped with sliding groove (4) on base (1), sliding block (2) and fixed block (3) are located respectively in sliding groove (4) on and opposite arrangement, sliding block (2) can slide in sliding groove (4), the side of fixed block (3) near sliding block (2) is provided with rotator no. The utility model provides a cutting tool, including base (1), sliding block (2) and fixed block (3), be equipped with sliding groove (4) on base (1), sliding block (2) and fixed block (3) are located respectively in sliding groove (4) on and opposite arrangement, sliding block (2) can slide in sliding groove (4), the side of fixed block (3) near sliding block (2) is provided with rotator no. The utility model provides a cutting tool, including base (1), sliding block (2) and fixed block (3), be equipped with sliding groove (4) on base (1), sliding block (2) and fixed block (3) are located respectively in sliding groove (4) on and opposite arrangement, sliding block (2) can slide in sliding groove (4), the side of fixed block (3) near sliding block (2) is provided with rotator no. The utility model provides a cutting tool, including base (1), sliding block (2) and fixed block (3), be equipped with sliding groove (4) on base (1), sliding block (2) and fixed block (3) are located respectively in sliding groove (4) on and opposite arrangement, sliding block (2) can slide in sliding groove (4), the side of fixed block (3) near sliding block (2) is provided with rotator no. The utility model provides a cutting tool, including base (1), sliding block (2) and fixed block (3), be equipped with sliding groove (4) on base (1), sliding block (2) and fixed block (3) are located respectively in sliding groove (4) on and opposite arrangement, sliding block (2) can slide in sliding groove (4), the side of fixed block (3) near sliding block (2) is provided with rotator no. The utility model provides a cutting tool, including base (1), sliding block (2) and fixed block (3), be equipped with sliding groove (4) on base (1), sliding block (2) and fixed block (3) are located respectively in sliding groove (4) on and opposite arrangement, sliding block (2) can slide in sliding groove (4), the side of fixed block (3) near sliding block (2) is provided with rotator no. The utility model provides a cutting tool, including base (1), sliding block (2) and fixed block (3), be equipped with sliding groove (4) on base (1), sliding block (2) and fixed block (3) are located respectively in sliding groove (4) on and opposite arrangement, sliding block (2) can slide in sliding groove (4), the side of fixed block (3) near sliding block (2) is provided with rotator no. The utility model provides a cutting tool, including base (1), sliding block (2) and fixed block (3), be equipped with sliding groove (4) 5. A micro PCD drill bit welding fixture device as claimed in claim 1, wherein: The end of the sliding block (2) away from the fixed block (3) is provided with a pushing assembly (12), the pushing assembly (12) comprises a clamping block (13), a connecting head (14), a push rod (15) and a mounting seat (16), the mounting seat (16) is installed on the base (1), the push rod (15) is provided on the mounting seat (16) and is connected with the connecting head (14), the clamping block (13) is fixedly connected with the sliding block (2), the clamping block (13) is provided with a clamping groove (17), the end of the connecting head (14) away from the push rod (15) is located in the clamping groove (17), and the connecting head (14) enables the push rod (15) to push the sliding block (2) to reciprocatingly slide in the sliding groove (4).

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