Self-adaptive positioning clamp for 3D printing of metal pipeline

Abstract

The utility model relates to metal pipeline 3D printing technical field, concretely for a kind of self-adapting positioning fixture for metal pipeline 3D printing, including base, the top of base is provided with metal pipe fitting, the both sides of base surface are provided with clamping plate, the surface of clamping plate is provided with inside and outside clamping mechanism, the inside and outside clamping mechanism includes taper disc and arc clamping piece, taper disc is fixed in the central position of clamping plate surface, the both sides of taper disc are provided with arc clamping piece.The utility model improves the firm degree when self-adapting positioning fixture clamps metal pipe fitting, avoids the phenomenon that metal pipeline displacement when self-adapting positioning fixture is used and influences 3D printing effect.

Description

Technical Field

[0001] This utility model relates to the field of metal pipe 3D printing technology, specifically an adaptive positioning fixture for metal pipe 3D printing. Background Technology

[0002] 3D printing technology is a technique that uses digital model files as a basis and employs powdered metal or plastic and other bondable materials to construct objects by printing layer by layer.

[0003] The patent number is 2025113409397, and the title is "An Invention of a High-Strength Metal Pipe Based on 3D Printed Metal Material and Its Manufacturing Process". The manufacturing process includes preparation, fixing the metal pipe, 3D printing and post-processing steps: first, the surface of the metal pipe is cleaned and a 3D printing model is designed. After fixing the pipe with a special fixture, laser or electron beam selective melting technology is used to select matching metal powder to print layer by layer on the surface of the pipe to form an integrated structure. Finally, heat treatment and surface treatment are performed to improve the performance.

[0004] According to the second step of the metal pipe manufacturing process described in the patent specification, "(2) Fixing the metal pipe: Place the cleaned metal pipe on the working platform of the 33D printer and use a special clamp or support structure to fix the metal pipe to ensure that the metal pipe will not be displaced during the 33D printing process," it can be seen that the metal pipe needs to be fixed by a clamp. Therefore, this utility model designs a clamp suitable for this metal pipe.

[0005] The structure of the metal pipe is shown in the attached instruction manual. Figure 1 As shown, when clamping the metal pipe, traditional adaptive positioning fixtures generally only support and clamp the two ends of the metal pipe, which has low stability and is prone to displacement of the metal pipe, affecting the 3D printing effect. Utility Model Content

[0006] The purpose of this invention is to provide an adaptive positioning fixture for 3D printing of metal pipes, in order to solve the problem mentioned in the background art that the adaptive positioning fixture has low stability during use, which easily leads to displacement of the metal pipes and affects the 3D printing effect.

[0007] To achieve the above objectives, this utility model provides the following technical solution: an adaptive positioning fixture for 3D printing of metal pipes, including a base, a metal pipe being disposed on the top of the base, clamping plates being disposed on both sides of the surface of the base, and inner and outer clamping mechanisms being disposed on the surface of the clamping plates, the inner and outer clamping mechanisms including a conical disc and an arc-shaped clamping piece, the conical disc being fixed at the center of the surface of the clamping plate, and arc-shaped clamping pieces being disposed on both sides of the conical disc.

[0008] Preferably, the arc-shaped clamp is made of a material with a certain deformation capability, and the central axis of the arc-shaped clamp and the central axis of the conical disk are in the same vertical plane.

[0009] Preferably, the inner and outer clamping mechanism further includes an adjusting clamp seat, a positive screw, and a negative screw. A positive screw is rotatably connected to the center position of the top of the clamping plate. One end of the positive screw extends into the interior of the clamping plate and is fixed with a negative screw. One end of the negative screw is rotatably connected to the inner wall of the clamping plate. Adjusting clamp seats are slidably arranged on both sides inside the base. The adjusting clamp seats are threadedly engaged with the positive screw and the negative screw, respectively.

[0010] Preferably, the inner and outer clamping mechanism further includes a pressure ball, a telescopic column, and an adjusting spring. Pressure balls are fixed on both sides at the bottom of the adjusting clamp, and the surface of the pressure ball is in contact with the surfaces at both ends of the arc-shaped clamping piece.

[0011] Preferably, a telescopic column is slidably provided at the bottom position of the adjusting clamp, one end of the telescopic column is fixedly connected to the center position of the arc-shaped clamp, and an adjusting spring is fixed between the telescopic column and the adjusting clamp.

[0012] Preferably, the inner and outer clamping mechanism further includes anti-slip ribs, and the surfaces of the conical disc and the arc-shaped clamping piece are both fixed with anti-slip ribs, and the surfaces of the anti-slip ribs are respectively in close contact with the inner wall and the outer surface of the metal pipe.

[0013] Preferably, the inner and outer clamping mechanism further includes a locking bolt, and a locking bolt is threadedly connected to the top position of the clamping plate. One end of the locking bolt passes through the base and is pressed and fastened to the surface of the positive screw.

[0014] Preferably, an adjustment mechanism is provided between the base and the clamping plate. The adjustment mechanism includes a longitudinal groove and a slide rail. The longitudinal groove is provided on both sides of the surface of the base. The slide rail is slidably arranged inside the longitudinal groove. The slide rail and the clamping plate slide together.

[0015] Preferably, the adjusting mechanism further includes a fastening screw and a locking stud. The surface of the slide is threaded with a fastening screw, one end of which passes through the slide and is pressed and fastened against the inner wall of the longitudinal slide groove. The bottom position of the clamping plate is threaded with a locking stud, one end of which passes through the clamping plate and is pressed and fastened against the inner wall of the slide.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: The adaptive positioning fixture for 3D printing of metal pipes is equipped with an inner and outer clamping mechanism and an adjustment mechanism. The base is placed inside the 3D printing worktable and fixed with screws. Then, the cleaned metal pipe is placed on top of the base. The slide rail is then slid along the longitudinal groove so that the clamping plate is located on the outer side of both ends of the metal pipe. The locking screw is then tightened to fix the slide rail. The clamping plate is then pushed so that one end of the conical disc is inserted into the inside of the metal pipe. Under the action of the two conical discs, the metal pipe is internally supported and clamped. Finally, the locking stud is tightened to fix the clamping plate. Then, rotate the positive screw, causing it to drive the negative screw to rotate. Since the two adjusting clamps are threadedly engaged with the positive and negative screws respectively, and the threads of the positive and negative screws are in opposite directions, the rotation of the positive screw causes the two adjusting clamps to rotate synchronously relative to each other. This causes the two arc-shaped clamps to clamp the two sides of the metal pipe fitting. At the same time, the anti-slip ribs on the surface of the conical disc and the arc-shaped clamps provide anti-slip properties, increasing the clamping firmness. Then, tighten the locking bolt to prevent the positive screw from loosening. Then, clamp the other end of the metal pipe fitting in the same way to realize the internal and external clamping function of the self-adaptive positioning fixture for the metal pipe fitting, thereby improving the firmness of the self-adaptive positioning fixture when clamping the metal pipe fitting.

[0017] Meanwhile, when the adjusting clamp causes the anti-slip ribs on the surface of the arc-shaped clamp to contact the metal pipe, the arc-shaped surface of the clamp cannot adapt to all sizes because different metal pipes have different diameters. Therefore, when the anti-slip ribs on the surface of the arc-shaped clamp contact the metal pipe, generally only the anti-slip ribs located at the center of the arc-shaped clamp contact the metal pipe. At this time, the positive screw can be rotated to make the adjusting clamp continue to move towards the metal pipe. At this time, the telescopic column stops moving, the adjusting spring contracts, and the adjusting clamp slides downward along the telescopic column. At this time, the adjusting clamp drives the pressure ball downward synchronously, causing the pressure ball to squeeze the arc-shaped clamp. Since the material of the arc-shaped clamp is a material that can undergo a certain degree of deformation, such as a thin iron sheet or steel sheet, the arc-shaped clamp can squeeze the anti-slip ribs downward, making the anti-slip ribs tightly adhere to the surface of the metal pipe, so that the entire arc-shaped clamp clamps the metal pipe, increasing the clamping firmness and avoiding the phenomenon that the metal pipe will be displaced when the self-adaptive positioning fixture is used, which would affect the 3D printing effect. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the existing metal pipe structure of this utility model; Figure 2 This is a three-dimensional structural diagram of the present invention; Figure 3 This is a schematic diagram of the front cross-sectional structure of this utility model; Figure 4 This is a three-dimensional enlarged structural diagram of the inner and outer clamping mechanism of this utility model; Figure 5 This is a partial side view enlarged structural schematic diagram of the inner and outer clamping mechanism of this utility model.

[0019] In the diagram: 1. Base; 11. Clamping plate; 2. Inner and outer clamping mechanism; 21. Conical disc; 22. Arc-shaped clamping piece; 23. Adjusting clamp seat; 24. Locking bolt; 25. Positive screw; 26. Negative screw; 27. Pressure ball; 28. Anti-slip rib; 29. ​​Telescopic column; 210. Adjusting spring; 3. Metal pipe fitting; 4. Adjusting mechanism; 41. Longitudinal slide groove; 42. Slide track; 43. Fastening screw; 44. Locking stud. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. In addition, the terms "first", "second", "third", "upper", "lower", "left", "right", etc. are used for descriptive purposes only and should not be construed as indicating or implying relative importance. At the same time, in the description of the present utility model, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0021] The structure of the adaptive positioning fixture for 3D printing of metal pipes provided by this utility model is as follows: Figure 1 and Figure 2 As shown, it includes a base 1, and a metal pipe 3 is provided on the top of the base 1. The metal pipe 3 is the metal pipe in the invention with patent number 2025113409397, entitled "A High-Strength Metal Pipe Based on 3D Printed Metal Material and Its Manufacturing Process". Clamping plates 11 are provided on both sides of the surface of the base 1, and the clamping plates 11 cover the two ends of the metal pipe 3.

[0022] Furthermore, such as Figure 2 and Figure 3As shown, the surface of the clamping plate 11 is provided with an inner and outer clamping mechanism 2. The inner and outer clamping mechanism 2 includes a conical disc 21 and an arc-shaped clamping piece 22. A conical disc 21 for internally supporting the metal pipe 3 is fixed at the center of the surface of the clamping plate 11. The central axis of the conical disc 21 coincides with the central axis of the metal pipe 3. Arc-shaped clamping pieces 22 for clamping the metal pipe 3 are provided on both sides of the conical disc 21. The arc-shaped clamping pieces 22 are made of a material with a certain deformation capacity, such as thin steel sheet or thin iron sheet. The arc-shaped clamping pieces 22 are symmetrically distributed along the central axis of the conical disc 21. The central axis of the arc-shaped clamping pieces 22 and the central axis of the conical disc 21 are in the same vertical plane. The arc-shaped clamping pieces 22 are located on both sides of the metal pipe 3.

[0023] Furthermore, such as Figure 3 , Figure 4 and Figure 5As shown, the inner and outer clamping mechanism 2 also includes an adjusting clamp 23, a positive screw 25, and a negative screw 26. A positive screw 25 is rotatably connected to the center of the top of the clamping plate 11. One end of the positive screw 25 extends into the interior of the clamping plate 11 and is fixed to the negative screw 26. One end of the negative screw 26 is rotatably connected to the inner wall of the clamping plate 11. The thread direction of the negative screw 26 is opposite to that of the positive screw 25. Adjusting clamps 23 are slidably arranged on both sides inside the base 1. The adjusting clamps 23 are threadedly engaged with the positive screw 25 and the negative screw 26 respectively, providing inner and outer clamping. Mechanism 2 also includes a locking bolt 24. A locking bolt 24 is threaded onto the top of the clamping plate 11. One end of the locking bolt 24 passes through the base 1 and is pressed and fastened against the surface of the positive screw 25. The inner and outer clamping mechanism 2 also includes a pressure ball 27, a telescopic column 29, and an adjusting spring 210. Pressure balls 27 are fixed on both sides of the bottom of the adjusting clamp 23. The surface of the pressure ball 27 contacts the surfaces at both ends of the arc-shaped clamp 22. When the adjusting clamp 23 causes the anti-slip ribs 28 on the surface of the arc-shaped clamp 22 to contact the metal pipe 3, the clamping mechanism... Since different metal pipe fittings 3 have different diameters, the arc-shaped surface of the arc-shaped clamp 22 cannot fit all sizes. Therefore, when the anti-slip ribs 28 on the surface of the arc-shaped clamp 22 come into contact with the metal pipe fitting 3, generally only the anti-slip ribs 28 located at the center of the arc-shaped clamp 22 contact the metal pipe fitting 3. At this time, the adjusting clamp 23 can continue to move downward, causing the pressure ball 27 to squeeze the arc-shaped clamp 22, so that the anti-slip ribs 28 located on both sides of the arc-shaped clamp 22 are tightly attached to the metal pipe fitting 3, thus clamping the metal pipe fitting 3. The bottom position of the adjusting clamp 23 is then adjusted. A telescopic column 29 is slidably provided. One end of the telescopic column 29 is fixedly connected to the center of the arc-shaped clamp 22. An adjusting spring 210 is fixed between the telescopic column 29 and the adjusting clamp 23 to facilitate the telescopic column 29 to extend and retract inside the adjusting clamp 23 without affecting the adjusting clamp 23 from driving the pressure ball 27 to continue to move downward. The inner and outer clamping mechanism 2 also includes anti-slip ribs 28. The surfaces of the conical disc 21 and the arc-shaped clamp 22 are both fixed with anti-slip ribs 28. The surfaces of the anti-slip ribs 28 are tightly attached to the inner wall and outer surface of the metal pipe 3, respectively.

[0024] In use, rotate the positive screw 25, causing it to drive the negative screw 26 to rotate. Since the two adjusting clamps 23 are threadedly engaged with the positive screw 25 and the negative screw 26 respectively, and the threads of the positive screw 25 and the negative screw 26 are in opposite directions, the rotation of the positive screw 25 causes the two adjusting clamps 23 to rotate synchronously relative to each other, causing the two arc-shaped clamps 22 to clamp the two sides of the metal pipe 3. At the same time, the anti-slip ribs 28 on the surface of the conical disc 21 and the arc-shaped clamps 22 provide anti-slip properties, increasing the clamping firmness. Then tighten the locking bolt 24 to prevent the positive screw 25 from loosening. Then, clamp the other end of the metal pipe 3 in the same way to realize the internal and external clamping function of the adaptive positioning fixture for the metal pipe 3, thereby improving the firmness of the adaptive positioning fixture when clamping the metal pipe 3.

[0025] Meanwhile, when the adjusting clamp 23 causes the anti-slip ribs 28 on the surface of the arc-shaped clamp 22 to contact the metal fitting 3, since different metal fittings 3 have different diameters, the arc-shaped surface of the arc-shaped clamp 22 cannot fit all sizes. Therefore, when the anti-slip ribs 28 on the surface of the arc-shaped clamp 22 contact the metal fitting 3, generally only the anti-slip ribs 28 located at the center of the arc-shaped clamp 22 contact the metal fitting 3. At this time, the positive screw 25 can be rotated further to make the adjusting clamp 23 continue to contact the metal fitting 3. During the movement, the telescopic column 29 stops moving, the adjusting spring 210 contracts, and the adjusting clamp 23 slides downward along the telescopic column 29. At this time, the adjusting clamp 23 drives the pressure ball 27 downward synchronously, causing the pressure ball 27 to squeeze the arc-shaped clamp 22. Since the arc-shaped clamp 22 is made of a material that can undergo a certain deformation, it can squeeze the anti-slip rib 28 downward, making the anti-slip rib 28 tightly adhere to the surface of the metal pipe 3, so that the entire arc-shaped clamp 22 clamps the metal pipe 3, increasing the clamping firmness.

[0026] Furthermore, such as Figure 1 and Figure 2 As shown, an adjustment mechanism 4 is provided between the base 1 and the clamping plate 11. The adjustment mechanism 4 includes a longitudinal slide groove 41 and a slide rail 42. The longitudinal slide groove 41 is provided on both sides of the surface of the base 1. The slide rail 42 is slidably provided inside the longitudinal slide groove 41. The slide rail 42 and the clamping plate 11 slide and cooperate with each other. The adjustment mechanism 4 also includes a fastening screw 43 and a locking stud 44. The fastening screw 43 is threadedly connected to the surface of the slide rail 42. One end of the fastening screw 43 passes through the slide rail 42 and is pressed and fastened to the inner wall of the longitudinal slide groove 41. The locking stud 44 is threadedly connected to the bottom position of the clamping plate 11. One end of the locking stud 44 passes through the clamping plate 11 and is pressed and fastened to the inner wall of the slide rail 42.

[0027] In use, place the base 1 inside the 3D printing workbench and fix it with screws. Then place the cleaned metal tube 3 on top of the base 1. Then slide the slide rail 42 so that the slide rail 42 slides along the longitudinal slide groove 41 so that the clamping plate 11 is located on the outer side of both ends of the metal tube 3. Then tighten the fastening screw 43 to fix the slide rail 42. Then push the clamping plate 11 so that one end of the conical disc 21 is inserted into the inside of the metal tube 3. Under the action of the two conical discs 21, the metal tube 3 is internally supported and clamped. Then tighten the locking stud 44 to fix the clamping plate 11.

[0028] Working principle: When in use, first place the base 1 inside the 3D printing workbench and fix it with screws. Then place the cleaned metal tube 3 on top of the base 1. Then slide the slide rail 42 so that the slide rail 42 slides along the longitudinal slide groove 41 so that the clamping plate 11 is located on the outer side of both ends of the metal tube 3. Then tighten the fastening screw 43 to fix the slide rail 42. Then push the clamping plate 11 so that one end of the conical disc 21 is inserted into the inside of the metal tube 3. Under the action of the two conical discs 21, the metal tube 3 is internally supported and clamped. Then tighten the locking stud 44 to fix the clamping plate 11. Then, rotate the positive screw 25, causing it to drive the negative screw 26 to rotate. Since the two adjusting clamps 23 are threadedly engaged with the positive screw 25 and the negative screw 26 respectively, and the threads of the positive screw 25 and the negative screw 26 are in opposite directions, the rotation of the positive screw 25 causes the two adjusting clamps 23 to rotate synchronously relative to each other, causing the two arc-shaped clamps 22 to clamp the two sides of the metal pipe 3. At the same time, the anti-slip ribs 28 on the surface of the conical disc 21 and the arc-shaped clamps 22 can prevent slippage and increase the clamping firmness. Then, tighten the locking bolt 24 to prevent the positive screw 25 from loosening. Then, similarly, clamp the other end of the metal pipe 3 to realize the internal and external clamping function of the adaptive positioning fixture for the metal pipe 3, thereby improving the firmness of the adaptive positioning fixture when clamping the metal pipe 3.

[0029] Meanwhile, when the adjusting clamp 23 causes the anti-slip ribs 28 on the surface of the arc-shaped clamp 22 to contact the metal fitting 3, because different metal fittings 3 have different diameters, the arc-shaped surface of the arc-shaped clamp 22 cannot fit all sizes. Therefore, when the anti-slip ribs 28 on the surface of the arc-shaped clamp 22 contact the metal fitting 3, generally only the anti-slip ribs 28 located at the center of the arc-shaped clamp 22 contact the metal fitting 3. At this time, the positive screw 25 can be rotated to make the adjusting clamp 23 continue to move towards the metal fitting 3. At this time, the telescopic column 29 stops moving, the adjusting spring 210 contracts, and the adjusting clamp 23... Slide downwards along the telescopic column 29. At this time, the adjusting clamp 23 drives the pressure ball 27 downwards in sync, causing the pressure ball 27 to squeeze the arc-shaped clamp 22. Since the arc-shaped clamp 22 is made of a material that can undergo a certain degree of deformation, it can squeeze the anti-slip rib 28 downwards, making the anti-slip rib 28 tightly adhere to the surface of the metal pipe 3. This allows the entire arc-shaped clamp 22 to clamp the metal pipe 3, increasing the clamping firmness and preventing the metal pipe from shifting during the use of the adaptive positioning fixture, which would affect the 3D printing effect. Finally, the adaptive positioning fixture is used to fix the metal pipe 3 on the 3D printing worktable.

[0030] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An adaptive positioning fixture for 3D printing of metal pipes, comprising a base (1), characterized in that: A metal pipe (3) is provided above the base (1). A clamping plate (11) is provided on both sides of the surface of the base (1). An inner and outer clamping mechanism (2) is provided on the surface of the clamping plate (11). The inner and outer clamping mechanism (2) includes a conical disc (21) and an arc-shaped clamping piece (22). A conical disc (21) is fixed at the center of the surface of the clamping plate (11). Arc-shaped clamping pieces (22) are provided on both sides of the conical disc (21).

2. The adaptive positioning fixture for 3D printing of metal pipes according to claim 1, characterized in that: The arc-shaped clamp (22) is made of a material with a certain deformation capability, and the central axis of the arc-shaped clamp (22) and the central axis of the conical disk (21) are in the same vertical plane.

3. The adaptive positioning fixture for 3D printing of metal pipes according to claim 1, characterized in that: The inner and outer clamping mechanism (2) further includes an adjusting clamp seat (23), a positive screw (25) and a negative screw (26). The positive screw (25) is rotatably connected at the center of the top of the clamping plate (11). One end of the positive screw (25) extends into the interior of the clamping plate (11) and is fixed with the negative screw (26). One end of the negative screw (26) is rotatably connected to the inner wall of the clamping plate (11). The adjusting clamp seat (23) is slidably provided on both sides inside the base (1). The adjusting clamp seat (23) is threadedly engaged with the positive screw (25) and the negative screw (26) respectively.

4. The adaptive positioning fixture for 3D printing of metal pipes according to claim 3, characterized in that: The inner and outer clamping mechanism (2) also includes a pressure ball (27), a telescopic column (29) and an adjusting spring (210). The pressure ball (27) is fixed on both sides at the bottom position of the adjusting clamp (23). The surface of the pressure ball (27) is in contact with the surfaces at both ends of the arc-shaped clamp (22).

5. The adaptive positioning fixture for 3D printing of metal pipes according to claim 4, characterized in that: A telescopic column (29) is slidably provided at the bottom position of the adjusting clamp (23). One end of the telescopic column (29) is fixedly connected to the center position of the arc-shaped clamp (22). An adjusting spring (210) is fixed between the telescopic column (29) and the adjusting clamp (23).

6. The adaptive positioning fixture for 3D printing of metal pipes according to claim 1, characterized in that: The inner and outer clamping mechanism (2) also includes anti-slip ribs (28). The surfaces of the conical disc (21) and the arc-shaped clamp (22) are both fixed with anti-slip ribs (28). The surfaces of the anti-slip ribs (28) are tightly attached to the inner wall and outer surface of the metal pipe fitting (3), respectively.

7. The adaptive positioning fixture for 3D printing of metal pipes according to claim 3, characterized in that: The inner and outer clamping mechanism (2) also includes a locking bolt (24). The top position of the clamping plate (11) is threaded with a locking bolt (24). One end of the locking bolt (24) passes through the base (1) and is pressed and fastened to the surface of the positive screw (25).

8. The adaptive positioning fixture for 3D printing of metal pipes according to claim 1, characterized in that: An adjustment mechanism (4) is provided between the base (1) and the clamping plate (11). The adjustment mechanism (4) includes a longitudinal groove (41) and a slide rail (42). The longitudinal groove (41) is provided on both sides of the surface of the base (1). The slide rail (42) is slidably provided inside the longitudinal groove (41). The slide rail (42) and the clamping plate (11) slide and cooperate with each other.

9. The adaptive positioning fixture for 3D printing of metal pipes according to claim 8, characterized in that: The adjustment mechanism (4) also includes a fastening screw (43) and a locking stud (44). The surface of the slide (42) is threaded with the fastening screw (43). One end of the fastening screw (43) passes through the slide (42) and is pressed and fastened against the inner wall of the longitudinal slide groove (41). The bottom position of the clamping plate (11) is threaded with the locking stud (44). One end of the locking stud (44) passes through the clamping plate (11) and is pressed and fastened against the inner wall of the slide (42).

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