A tool for removing spot welding points of a body in white

Abstract

The present invention relates to a white body spot welding spot removal tool, the spot removal tool comprises a hook, a pressure rod, a drill gun fixing bracket and a drill gun; the hook comprises a first rod and a second rod, the first rod and the second rod are connected, the angle between the two can be adjusted, the first rod is fixedly connected to one end of the pressure rod, and the second rod is used to connect the body sheet metal; the pressure rod is connected to the drill gun fixing bracket, and the drill gun fixing bracket is used to fix the drill gun; after the drill gun is turned on, the other end of the pressure rod is pressed down to control the drill gun to remove the welding spot. The product of the present invention can be used together with the drill gun, is simple to operate, easy to use, can effectively improve the work efficiency of technicians, and at the same time reduce the fatigue of technicians and improve the quality of weld stripping.

Description

Technical Field

[0001] The invention relates to the field of car body disassembly, and in particular to a tool for removing spot welding points of a car body in white. Background Art

[0002] During the disassembly of the body in white, technicians need to destroy the welding points while ensuring that the body sheet metal does not deform, so as to achieve the purpose of sheet metal separation. Under the premise of ensuring that the sheet metal does not deform, the most common methods of destroying welding points are: plasma cutting to destroy welding points, and electric drilling to drill and peel welding points. However, these two methods have the following problems:

[0003] 1) Plasma cutting damages solder joints: Plasma cutting equipment is complex and difficult to operate, and a large amount of toxic gas will be generated during the solder joint cutting process. In addition, the arc light will damage the eyes and skin, and will cause harm to the technician's body;

[0004] 2) Drilling and stripping welds with an electric drill: This method is simpler to operate than plasma cutting to destroy welds, but it is labor-intensive for technicians. Technicians need to concentrate all their strength on the handheld electric drill, which is a laborious operation. If high-strength steel plates or ultra-high-strength steel plates are encountered, the labor intensity required for disassembly will be greater, and the efficiency of drilling and stripping welds with an electric drill is very low. Summary of the invention

[0005] In order to solve the problems existing in the above-mentioned prior art, the present invention provides a white body spot welding weld removal tool, which uses the lever principle to apply pressure to the tail of the drill gun, replacing pure manpower to apply pressure to the drill gun, thereby reducing the technician's physical output, reducing the technician's fatigue, increasing the weld removal speed, improving work efficiency, and improving the quality of weld peeling.

[0006] The specific technical solutions of the present invention are as follows:

[0007] A body-in-white spot welding spot removal tool, the spot welding spot removal tool comprising a hook, a pressure rod, a drill gun fixing bracket and a drill gun;

[0008] The hook comprises a first rod and a second rod, the first rod and the second rod are connected, the angle between the first rod and the second rod can be adjusted, the first rod is fixedly connected to one end of the pressure rod, and the second rod is used to connect the body sheet metal;

[0009] The pressure rod is connected to the drill gun fixing bracket, and the drill gun fixing bracket is used to fix the drill gun; after the drill gun is turned on, the other end of the pressure rod is pressed down to control the drill gun to remove the welding point.

[0010] Furthermore, the hook also includes an adjusting rod and a rotating joint; the first rod is connected to one end of the adjusting rod through the rotating joint, the adjusting rod has a straight cavity, the straight cavity opening is located at the other end of the adjusting rod, one end of the second rod is inserted into the straight cavity through the straight cavity opening and connected to the adjusting rod, and the insertion depth can be adjusted.

[0011] Furthermore, m limiting holes are evenly distributed on the side wall of the straight cavity of the adjusting rod along the axial direction, m>1, and n limiting blocks are evenly distributed on the end of the second rod along the axis, where 1≤n<m, and the second rod is inserted into the straight cavity to a corresponding depth, and the second rod is rotated, and the limiting blocks are inserted into the corresponding limiting holes to fix the second rod to the adjusting rod.

[0012] Furthermore, the connecting end of the first rod and the pressure rod is a first hook, and the first rod is connected to the pressure rod through the first hook; one end of the second rod is provided with a second hook with the same bending direction as the first hook, and is connected to the body sheet metal through the second hook.

[0013] Furthermore, the hook also includes a first mounting sleeve, a threaded rod is provided at one end of the pressure rod, the first mounting sleeve is sleeved on the threaded rod, and the first mounting sleeve is fixed to the pressure rod by threaded connection with the threaded rod through a pressure rod nut; the first bent hook is welded and fixed to the outer wall of the first mounting sleeve along the circumference of the first mounting sleeve.

[0014] Furthermore, the two first installation sleeves are sequentially sleeved on the threaded rod, the two hooks are respectively connected to the two first installation sleeves through the first hooks, and the bending directions of the first hooks of the two hooks are opposite.

[0015] Further, the drill gun fixing bracket includes a mounting support, a fixing clamping plate, a second mounting sleeve and an auxiliary switch;

[0016] The mounting support is used to place the drill gun; the fixed clamp is installed above the mounting support and is used to fix the drill gun; the second mounting sleeve is installed above the mounting support and is used to fix the pressure rod; the auxiliary switch is installed on the mounting support, and the installation position corresponds to the drill gun switch position of the drill gun, and is used to turn on and off the drill gun.

[0017] Furthermore, the mounting support includes a front plate, a rear plate and a support plate, the front plate and the rear plate are both composed of a bottom plate, a first support plate and a second support plate; the first support plate and the second support plate are respectively arranged on both sides of the top of the bottom plate; the front plate is connected to the rear plate through the support plate below the first support plate;

[0018] After the drill gun is placed on the support plate, two ends of the fixed clamping plate are connected to the first support plates of the front plate and the rear plate respectively to fix the drill gun;

[0019] The second mounting sleeve is welded and fixed above the second support plate of the front plate and the rear plate, and the second mounting sleeve is sleeved on the pressure rod and fixed to the pressure rod;

[0020] The auxiliary switch is provided with a notch at a position relative to the drill gun switch. When the drill gun switch is placed in the notch, the drill gun is in a closed state; when the drill gun switch is out of the notch, the auxiliary switch squeezes the drill gun switch to turn on the drill gun.

[0021] Furthermore, two ends of the fixed clamping plate are respectively clamped with the first supporting plates of the front plate and the rear plate through clamping structures, and the clamping position is adjusted according to the drill guns of different specifications.

[0022] Furthermore, a slot is axially provided on the inner side of the second mounting sleeve, a bayonet is provided on the pressure rod, and the bayonet is fixed in the slot after the second mounting sleeve is sleeved on the pressure rod.

[0023] Beneficial effects of the present invention:

[0024] The present invention utilizes the lever principle to apply pressure to the tail of the drill gun through a pressure rod, replacing pure manpower to apply pressure to the drill gun, thereby reducing the physical output of the technician, reducing the technician's fatigue, solving the problem of technicians using the drill gun to destroy the weld point too much effort, reducing the technician's rest frequency, and improving the efficiency of car body disassembly. The present invention has no toxic gas and arc light in the process of cutting the weld point, avoiding harm to the technician's body, and can completely destroy the weld point and improve the weld point stripping quality.

[0025] In addition, the tool of the present invention is simple to manufacture and easy to use. The length and angle of the hook can be adjusted to adapt to the hanging of different positions of the car body sheet metal. The fixed clamping plate can be adjusted to the clamping position with the mounting bracket through the clamping structure to meet the use purposes of drill guns of different specifications. The second mounting sleeve and the pressure rod are connected through the clamping groove and the bayonet pin to achieve the fixation of the pressure rod, which is convenient for disassembly and assembly. In addition, the drill gun can be conveniently turned on and off through the auxiliary switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the assembly of a spot welding point removal tool for a body-in-white according to the present invention;

[0027] Figure 2 It is a schematic diagram of the hook structure in the present invention;

[0028] Figure 3 It is a schematic diagram of the adjustment rod in the present invention;

[0029] Figure 4 is a schematic diagram of the second rod in the present invention;

[0030] Figure 5 This is a schematic diagram of the structure of the pressure rod in the present invention;

[0031] Figure 6 It is a schematic diagram of a drill gun fixing bracket in the present invention;

[0032] Figure 7 It is a schematic diagram of the second installation sleeve in the present invention;

[0033] Figure 8 It is a schematic diagram of the arrangement of the latch pins on the pressure rod of the present invention;

[0034] Fig. 9 It is an assembly diagram of the pressure rod, the drill gun fixing bracket and the drill gun of the present invention;

[0035] Fig.10 It is a structural schematic diagram of a drill gun switch and an auxiliary switch in a drill gun closed state of the present invention;

[0036] Fig.11 This is a schematic diagram of the structure of the drill gun switch and the auxiliary switch when the drill gun is in the turned-on state of the present invention.

[0037] Among them: 1-hook, 2-pressure rod, 3-drill gun fixing bracket, 4-drill gun, 5-first rod, 6-adjusting rod, 7-second rod, 8-first hook, 9-first mounting sleeve, 10-rotating joint, 11-second hook, 12-limiting hole, 13-limiting block, 14-pressure rod nut, 15-threaded rod, 16-mounting support, 17-clamping structure, 18-fixed clamping plate, 19-second mounting sleeve, 20-auxiliary switch, 21-cage, 22-pin, 23-drill gun switch. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the technical solution of the present application, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0039] The terms such as up, down, left, right, front and back in this application document are based on the positional relationships shown in the drawings. If the drawings are different, the corresponding positional relationships may also change accordingly, so they cannot be understood as limiting the scope of protection.

[0040] In the present invention, the terms "install", "connected", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection or mutual communication, a direct connection or an indirect connection through an intermediate medium, the internal connection of two components, or the interaction relationship between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] This embodiment records a body-in-white spot welding spot removal tool, which uses the lever principle to apply pressure to the drill gun, which can effectively improve the work efficiency of technicians, while reducing the technicians' fatigue and improving the quality of weld spot peeling.

[0042] like Figure 1 As shown, the welding point removal tool includes a hook 1, a pressure rod 2, a drill gun fixing bracket 3 and a drill gun 4. One end of the two hooks 1 is fixed on opposite sides of one end of the pressure rod 2, and the two hooks 1 are bent in opposite directions to hang the body sheet metal. The pressure rod 2 is installed on the drill gun fixing bracket 3, and the drill gun fixing bracket 3 is used to fix the drill gun 4. When the drill gun 4 is working, the technician presses down the other end of the pressure rod 2 to control the drill gun 4 to destroy the welding point, thereby removing the welding point.

[0043] Hook 1 Figure 2 As shown, it includes a first rod 5, an adjusting rod 6, a second rod 7, a first mounting sleeve 9, and a rotating joint 10.

[0044] One end of the first rod 5 is a first hook 8, and the first rod 5 is fixed to the outer wall of the first mounting sleeve 9 by welding along the circumference of the first mounting sleeve 9 through the first hook 8. The length direction of the first rod 5 is perpendicular to the axial direction of the first mounting sleeve 9. The first mounting sleeve 9 has a mounting hole. The two first mounting sleeves 9 are sequentially sleeved on the ends of the pressure rod 2 through the mounting holes and fixed by the pressure rod nut 14. The two hooks 1 are respectively connected to the two first mounting sleeves 9 through the first hook 8. The other end of the first rod 5 is connected to one end of the adjustment rod 6 through the rotating joint 10. The rotating joint 10 can be a rotating bolt. After loosening, the adjustment rod 6 can rotate relative to the first rod 5 to change the angle between the adjustment rod 6 and the first rod 5 to adjust the extension direction of the adjustment rod 6. After adjustment, the rotating joint 10 is locked to make the adjustment rod 6 and the first rod 5 fixedly connected.

[0045] The adjusting rod 6 has a straight cavity, the opening of the straight cavity is located at the other end of the adjusting rod 6, the second rod 7 is inserted into the straight cavity through the straight cavity opening and connected to the adjusting rod 6, and the overall length of the hook 1 can be adjusted according to the depth of the second rod 7 inserted into the straight cavity. Figure 3 As shown, m limiting holes 12 are evenly distributed on the side wall of the straight cavity of the adjusting rod 6 along the axial direction, m>1, as shown in FIG. Figure 4 As shown, one end of the second rod 7 is a straight rod end, and n limit blocks 13 are evenly distributed along the axis, where 1≤n<m. The second rod 7 is inserted into the straight cavity of the adjusting rod 6, and the second rod 7 is rotated to make the limit block 13 snap into the limit hole 12. By clamping different limit holes 12 and limit blocks 13, the length of the hook 1 is adjusted. Hooks 1 of different lengths are used in conjunction with the rotating joint 10 to adapt to the hanging of different positions of the body sheet metal.

[0046] The other end of the second rod 7 is a hook end, provided with a second hook 11 bent in the same direction as the first hook 8, which is used to hook the body sheet metal and can play a role of fixed support, making it easier for the pressure rod 2 to apply pressure. The first hook 8 and the second hook 11 bent in the same direction not only avoid the movement of the hook 1 during the removal of the weld, but also when the weld between the first hook 8 and the first mounting sleeve 9 is loose, the first hook 8 is tightly fastened to the first mounting sleeve 9 under the tension of the second hook 11 hooking the body sheet metal, thereby providing the technician with time to close the drill gun 4 and avoiding the risk of unhooking.

[0047] In this embodiment, the pressure rod 2 is used to apply pressure to the drill gun 4, and a threaded rod 15 is provided at one end. The diameter of the threaded rod 15 is smaller than that of the pressure rod 2. Figure 5 As shown, the first installation sleeve 9 is sleeved on the threaded rod 15 , and the pressure rod nut 14 is threadedly connected to the end of the threaded rod 15 to lock the first installation sleeve 9 on the threaded rod 15 to prevent the first installation sleeve 9 from detaching from the threaded rod 15 .

[0048] The drill gun fixing bracket 3 is used to fix the drill gun 4 and connect the pressure rod 2. Figure 6 As shown, the drill gun fixing bracket 3 includes a mounting support 16 , a clamping structure 17 , a fixing clamping plate 18 , a second mounting sleeve 19 and an auxiliary switch 20 .

[0049] The mounting support 16 is used to place the drill gun 4, and includes a front plate, a rear plate and a support plate. The front plate and the rear plate have the same structure, and are composed of a bottom plate, a first support plate and a second support plate, and the first support plate and the second support plate are respectively arranged on both sides of the top of the bottom plate. The support plate is an L-shaped structure, and the front plate is connected to the rear plate through the support plate under the first support plate.

[0050] The fixed clamping plate 18 is a U-shaped structure, which is buckled downward on the mounting support 16, and the two ends are clamped with the first support plates of the front plate and the rear plate through the clamping structure 17, so as to fix the drill gun 4. The fixed clamping plate 18 is made of plastic and is light in weight, which is conducive to reducing the weight of the weld removal tool. The clamping structure 17 includes but is not limited to a combination of clamping columns and positioning holes. For example, multiple rows of positioning holes are arranged at intervals on the upper and lower parts of the first support plate, and clamping columns corresponding to the number of positioning holes in each row are symmetrically arranged on both sides of the fixed clamping plate 18. The clamping method of the clamping columns and the positioning holes can ensure the convenience of installation and the connection strength between the fixed clamping plate 18 and the mounting support 17. By adjusting the clamping position of the fixed clamping plate 18 and the first support plate, the purpose of adapting to drill guns 4 of different specifications can be achieved.

[0051] The second mounting sleeve 19 is welded and fixed above the second support plate of the front plate and the rear plate, and the pressure rod 2 is inserted and fixed in the second mounting sleeve 19. Figure 7 As shown, in this embodiment, a card groove 21 is axially provided on the inner side of the second mounting sleeve 19. In order to ensure that the pressure rod 2 is stably fixed in the second mounting sleeve 19, two card grooves 21 are symmetrically arranged in the second mounting sleeve 19. The card groove 21 is composed of a slide groove and a limit groove connected. The width of the limit groove is larger than the width of the slide groove, and the limit groove of one card groove 21 is arranged below one end of the slide groove, and the limit groove of the other card groove 21 is arranged above the other end of the slide groove, that is, the two limit grooves are arranged at both ends of the second mounting sleeve 19.

[0052] The two opposite sides of the middle of the pressure rod 2 are respectively provided with a latch 22. Figure 8 As shown, the length of the bayonet 22 matches the length of the limiting groove. The bayonet 22 slides along the slide groove to the limiting groove. The bayonet 22 is rotated into the limiting groove by rotating the pressure rod 2, and the pressure rod 2 is fixed in the second mounting sleeve 19.

[0053] The auxiliary switch 20 is composed of a rotating shaft and a switch component. The two ends of the rotating shaft are respectively mounted on the bottom plates of the front plate and the rear plate of the mounting support 16. The switch component is fixed to the end of the rotating shaft and placed outside the front plate. The rotating shaft is driven to rotate by rotating the switch component. The installation height of the auxiliary switch 20 corresponds to the drill gun switch 23, and the rotating shaft is provided with a notch at a position relative to the drill gun switch 23. When the drill gun switch 23 is placed in the notch, the drill gun 4 is in a closed state. When the auxiliary switch 20 is turned and the drill gun switch 23 is separated from the notch, the rotating shaft squeezes the drill gun switch 23 to turn on the drill gun 4.

[0054] The steps for using the solder joint removal tool are:

[0055] 1. Place the drill gun 4 on the support plate of the mounting bracket 16, between the front plate and the rear plate, insert the drill gun switch 23 into the shaft notch of the auxiliary switch 20, and fix it with the fixing clamp 18;

[0056] 2. The pressure rod 2 extends into the second installation sleeve 19. When the pressure rod 2 reaches the position of the bayonet 22, the bayonet 22 moves along the slide groove until it reaches the limit groove. The pressure rod 2 is rotated so that the bayonet 22 is placed in the limit groove to fix the pressure rod 2.

[0057] 3. The two first installation sleeves 9 are sequentially sleeved on the threaded rod 15 of the pressure rod 2, and are locked and fixed with the threaded rod 15 through the pressure rod nut 14; the two hooks 1 are respectively welded and fixed to the outside of the two first installation sleeves 9 through the first hooks 8, and the two second hooks 11 are bent in opposite directions, thereby completing the assembly of the welding point removal tool;

[0058] 4. Hook the body sheet metal through the second hook 11 of the hook 1, turn the auxiliary switch 20 to start the drill gun 4, and the technician presses down the other end of the pressure rod 2 (that is, the end without the hook 1) to control the drill gun 4 to destroy the welding point and successfully peel off the sheet metal;

[0059] 5. After the sheet metal is stripped, the auxiliary switch 20 is turned in the reverse direction to turn off the drill gun 4, and the removal of the spot welding points is completed.

[0060] Compared with using an electric drill alone, the specific use effect of the solder joint removal tool is shown in Table 1:

[0061] Table 1 Comparison of the effects of different methods for solder joint removal

[0062]

[0063] It can be seen that compared with the electric drill used to drill and strip welds in the prior art, the weld removal tool has greatly improved the single-point stripping efficiency, and the technician's rest frequency has also been greatly reduced. As a result, the technician can easily and thoroughly destroy the weld, achieve the purpose of smooth sheet metal stripping, and improve the car body disassembly efficiency and weld stripping quality.

[0064] Although the principle of the present invention has been described in detail above in conjunction with the preferred embodiments of the present invention, those skilled in the art should understand that the above embodiments are merely explanations of the exemplary implementations of the present invention, and are not intended to limit the scope of the present invention. The details in the embodiments do not constitute limitations on the scope of the present invention, and any obvious changes such as equivalent transformations, simple replacements, etc. based on the technical solution of the present invention, without departing from the spirit and scope of the present invention, fall within the scope of protection of the present invention.

Claims

1. A body-in-white spot welding point removal tool, characterized in that: The welding point removal tool comprises a hook (1), a pressure rod (2), a drill gun fixing bracket (3) and a drill gun (4); The hook (1) comprises a first rod (5) and a second rod (7), the first rod (5) and the second rod (7) are connected, and the angle between the first rod (5) and the second rod (7) can be adjusted, the first rod (5) is fixedly connected to one end of the pressure rod (2), and the second rod (7) is used to connect to the body sheet metal; The pressure rod (2) is connected to the drill gun fixing bracket (3), and the drill gun fixing bracket (3) is used to fix the drill gun (4); after the drill gun (4) is turned on, the other end of the pressure rod (2) is pressed down to control the drill gun (4) to remove the welding point; The drill gun fixing bracket (3) comprises a mounting support (16), a fixing clamping plate (18), a second mounting sleeve (19) and an auxiliary switch (20); The mounting support (16) is used to place the drill gun (4); the fixing clamp (18) is installed above the mounting support (16) and is used to fix the drill gun (4); the second mounting sleeve (19) is installed above the mounting support (16) and is used to fix the pressure rod (2); the auxiliary switch (20) is installed on the mounting support (16), and the installation position corresponds to the position of the drill gun switch (23) of the drill gun (4), and is used to turn on and off the drill gun (4); The mounting support (16) comprises a front plate, a rear plate and a support plate, wherein the front plate and the rear plate are both composed of a bottom plate, a first support plate and a second support plate; the first support plate and the second support plate are respectively arranged on both sides of the top of the bottom plate; the front plate is connected to the rear plate through the support plate below the first support plate; After the drill gun (4) is placed on the support plate, the two ends of the fixed clamping plate (18) are respectively connected to the first supporting plates of the front plate and the rear plate to fix the drill gun (4); The second mounting sleeve (19) is welded and fixed above the second support plate of the front plate and the rear plate, and the second mounting sleeve (19) is sleeved on the pressure rod (2) and fixed to the pressure rod (2); The auxiliary switch (20) is provided with a notch at a position relative to the drill gun switch (23); when the drill gun switch (23) is placed in the notch, the drill gun (4) is in a closed state; when the drill gun switch (23) is separated from the notch, the auxiliary switch (20) squeezes the drill gun switch (23) to turn on the drill gun (4).

2. The body-in-white spot welding point removal tool according to claim 1, characterized in that: The hook (1) further comprises an adjusting rod (6) and a rotating joint (10); the first rod (5) is connected to one end of the adjusting rod (6) via the rotating joint (10); the adjusting rod (6) has a straight cavity, the opening of the straight cavity is located at the other end of the adjusting rod (6); one end of the second rod (7) is inserted into the straight cavity through the straight cavity opening and connected to the adjusting rod (6), and the insertion depth can be adjusted.

3. The body-in-white spot welding point removal tool according to claim 2, characterized in that: The straight cavity side wall of the adjusting rod (6) is evenly distributed with m limiting holes (12) along the axial direction, m>1, and the end of the second rod (7) is evenly distributed with n limiting blocks (13) along the axis, wherein 1≤n<m. The second rod (7) is inserted into the straight cavity to a corresponding depth, and the second rod (7) is rotated, and the limiting blocks (13) are snapped into the corresponding limiting holes (12) to fix the second rod (7) and the adjusting rod (6).

4. The body-in-white spot welding point removal tool according to any one of claims 1 to 3, characterized in that: The connecting end of the first rod (5) and the pressure rod (2) is a first hook (8), and the first rod (5) is connected to the pressure rod (2) via the first hook (8); one end of the second rod (7) is provided with a second hook (11) having the same bending direction as the first hook (8), and is connected to the body sheet metal via the second hook (11).

5. The body-in-white spot welding point removal tool according to claim 4, characterized in that: The hook (1) also includes a first mounting sleeve (9), a threaded rod (15) is provided at one end of the pressure rod (2), the first mounting sleeve (9) is sleeved on the threaded rod (15), and the first mounting sleeve (9) is fixed to the pressure rod (2) by threaded connection with the threaded rod (15) through a pressure rod nut (14); the first bent hook (8) is welded and fixed to the outer wall of the first mounting sleeve (9) along the circumference of the first mounting sleeve (9).

6. The body-in-white spot welding point removal tool according to claim 5, characterized in that: The two first installation sleeves (9) are sequentially sleeved on the threaded rod (15), and the two hooks (1) are respectively connected to the two first installation sleeves (9) through the first bent hooks (8), and the bending directions of the first bent hooks (8) of the two hooks (1) are opposite.

7. The body-in-white spot welding point removal tool according to claim 1, characterized in that: The two ends of the fixed clamping plate (18) are respectively clamped with the first support plates of the front plate and the rear plate through the clamping structure (17), and the clamping position is adjusted according to the drill guns (4) of different specifications.

8. The body-in-white spot welding point removal tool according to claim 1, characterized in that: A clamping groove (21) is axially provided on the inner side of the second mounting sleeve (19), a clamping pin (22) is provided on the pressure rod (2), and the clamping pin (22) is fixed in the clamping groove (21) after the second mounting sleeve (19) is sleeved on the pressure rod (2).

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