Hydraulic bulging device for corrugated pipe

Abstract

The utility model relates to the technical field of pipe wrinkling, and discloses a hydraulic bulging device for corrugated pipes, which comprises a base, a placing groove is arranged on the upper side of the base, a lower die is arranged on the upper side of the base, the lower side of the lower die extends into the placing groove, and a lifting module is fixedly connected to the upper side of the base. A hydraulic rod is fixedly connected to the lower side of the lifting module, a fixing shell is fixedly connected to the lower end of the hydraulic rod, an upper mold is arranged on the lower side of the fixing shell, the upper side of the upper mold extends into the fixing shell, a sealing mechanism is arranged on the base, a lower fixing mechanism is arranged on the base, and an upper fixing mechanism is arranged on the fixing shell and the upper mold. According to the bulging device, the fixing mechanism of the die can be quickly disassembled and assembled, so that when the die is replaced, much time is not wasted on the fixing mechanism of the die, and the replacement efficiency of the die of the bulging device is improved.

Description

Technical Field

[0001] This utility model relates to the field of pipe wrinkling technology, specifically a hydraulic bulging device for corrugated pipes. Background Technology

[0002] A corrugated pipe is a tubular elastic sensitive element made of foldable corrugated sheets connected along the folding and stretching direction. Hydraulic bulging is one of the commonly used metal corrugated pipe processing technologies in industry. Its principle is to apply internal pressure inside the metal pipe, causing the pipe to expand radially. Under the overall action of mold extrusion and internal pressure, a corrugated structure is formed.

[0003] In the operation of a hydraulic bulging device, the mold is a crucial structure, and its condition is extremely important. If the mold is worn, it will affect the finished corrugated pipe and thus the final quality of the corrugated pipe. Therefore, it is necessary to regularly check the wear of the mold, especially the crests and troughs of the corrugated pipe. If wear, scratches, or other defects are found on the mold surface, the mold needs to be replaced in time. However, in order to ensure a tight connection between the molds, multiple bolts are usually used to connect the molds to the device. When replacing the mold, multiple bolts need to be disassembled and installed in sequence to complete the mold replacement. This causes the workers to waste a lot of time on the disassembly and assembly of bolts, thus reducing the mold replacement efficiency of the bulging device. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this utility model provides a hydraulic bulging device for corrugated pipes, which has the function of quickly disassembling and installing the mold fixing mechanism. This reduces the time wasted on the mold fixing mechanism when changing the mold, thereby improving the mold changing efficiency of the bulging device.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the present invention provides the following technical solution: a hydraulic bulging device for corrugated pipes, comprising a base, a placement groove on the upper side of the base, a lower mold on the upper side of the base, and the lower side of the lower mold extending into the interior of the placement groove.

[0008] A lifting module is fixedly connected to the upper side of the base, a hydraulic rod is fixedly connected to the lower side of the lifting module, and a fixed shell is fixedly connected to the lower end of the hydraulic rod.

[0009] An upper mold is provided on the lower side of the fixed shell, and the upper side of the upper mold extends into the interior of the fixed shell. A sealing mechanism is provided on the base, which can seal the lower mold and the upper mold and inject liquid.

[0010] The sealing mechanism includes two slides, two sliders, a sealing block, a liquid injection block, a liquid storage tank, a motor assembly, and a bidirectional screw;

[0011] The base is equipped with a lower fixing mechanism, which can fix the lower mold on the base;

[0012] The lower fixing mechanism includes a mounting slot, two first slots, two second slots, a mounting block, two locking rods, two first fixing slots, a first connecting block, and two first fixing rods;

[0013] The fixed shell and the upper mold are provided with an upper fixing mechanism, which can fix the upper mold on the fixed shell;

[0014] The upper fixing mechanism includes two first limiting grooves, two second limiting grooves, a control block, two limiting rods, two second fixing grooves, a second connecting block, and two second fixing rods.

[0015] Preferably, both of the sliding grooves are formed inside the base, and the two sliding grooves are respectively set on the front and rear sides of the placement groove, and both sliding grooves are T-shaped grooves;

[0016] Two sliders are slidably connected inside two grooves, and two grooves extend from the upper side of the two sliders. A sealing block is fixedly connected to the rear side of the front slider, and an injection block is fixedly connected to the front side of the rear slider.

[0017] The liquid storage tank is fixedly connected to the rear side of the base, and a water supply pipe is connected between the liquid storage tank and the liquid injection block. The motor assembly is fixedly connected to the front side of the base.

[0018] Preferably, the output end of the motor assembly is fixedly connected to a drive shaft, the rear end of the drive shaft extends rotatably into the interior of the slide groove, and a bidirectional screw is fixedly connected to the rear end of the motor assembly;

[0019] The rear end of the bidirectional screw rotates and penetrates into the interior of the rear sliding groove, and the rear end of the bidirectional screw is rotatably connected to the rear wall of the rear sliding groove.

[0020] A two-way screw thread passes through both sliders, with the control panel positioned on the left side of the base.

[0021] Preferably, the mounting groove is located on the left side of the base, and the two first slots are located on the right wall of the mounting groove, with both first slots extending out of the right side of the base.

[0022] Both second slots are located inside the lower mold, and extend out to the left and right sides of the lower mold respectively. The two second slots are adapted to the two first slots respectively.

[0023] The mounting block is set inside the mounting slot. A handle is fixedly connected to the left side of the mounting block, and two locking rods are fixedly connected to the right side of the mounting block.

[0024] Preferably, the two locking rods extend into the interiors of the two first locking slots and the two second locking slots, respectively, and the two first fixing slots are respectively formed inside the two locking rods;

[0025] Two first fixing slots extend to the upper and lower sides of the two locking rods respectively. Both first fixing slots are located on the right side of the base, and the first connecting block is located on the upper side of the two locking rods.

[0026] The upper side of the first connecting block is also fixedly connected with a handle, and the two first fixing rods are fixedly connected to the lower side of the first connecting block, with the two first fixing rods extending into the interior of the two first fixing grooves respectively.

[0027] Preferably, both first limiting grooves are formed on the left side of the fixed shell, both first limiting grooves extend out of the right side of the fixed shell, and both second limiting grooves are set inside the upper mold.

[0028] The two second limiting grooves extend out of the left and right sides of the upper mold respectively, and the two second limiting grooves are compatible with the two first limiting grooves;

[0029] The control block is located on the left side of the fixed shell, and an operating groove is provided on the control block. Both limit rods are fixedly connected to the right side of the control block.

[0030] Preferably, the right ends of the two limiting rods extend into the interiors of the two first limiting grooves and the two second limiting grooves, respectively, and the two second fixing grooves are respectively opened inside the two limiting rods;

[0031] Two second fixing slots extend to the upper and lower sides of the two limiting rods respectively, and the second connecting block is set on the upper side of the two limiting rods. The second connecting block is set on the right side of the fixing shell.

[0032] The second connecting block also has an operating groove, and the two second fixing rods are fixedly connected to the lower side of the second connecting block, with the two second fixing rods extending into the interior of the two second fixing grooves respectively.

[0033] (III) Beneficial Effects

[0034] Compared with the prior art, this utility model provides a hydraulic bulging device for corrugated pipes, which has the following advantages:

[0035] (1) The corrugated pipe uses a hydraulic expansion device. Pulling the handle of the first connecting block upward releases the limiting state between the first fixing rod and the first fixing groove. Then, pulling the handle of the mounting block to the left allows the lower mold to be removed from the inside of the placement groove for replacement. In this way, the fixing mechanism of the mold can be quickly disassembled and installed, so that when replacing the mold, less time is wasted on the fixing mechanism of the mold, thereby improving the mold replacement efficiency of the expansion device.

[0036] (2) The corrugated pipe is formed by a hydraulic expansion device. Then, it is moved upward through the operating groove on the second connecting block, thereby releasing the limiting state between the second fixing rod and the second fixing groove. Then, it is moved to the left through the operating groove on the control block, so that the upper mold will move out from the inside of the fixed shell for replacement, which further facilitates the replacement of the mold. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the structure of a hydraulic bulging device for corrugated pipes according to the present invention;

[0038] Figure 2 This is a schematic diagram of the cross-sectional connection structure of the base of this utility model;

[0039] Figure 3 This is a schematic diagram of the lower mold connection structure of this utility model;

[0040] Figure 4 This is a schematic diagram of the upper mold connection structure of this utility model.

[0041] In the diagram: 1. Base; 2. Placement slot; 3. Lower mold; 4. Lifting module; 5. Hydraulic rod; 6. Fixed shell; 7. Upper mold; 8. Slide groove; 9. Slider; 10. Sealing block; 11. Injection block; 12. Storage tank; 13. Motor assembly; 14. Bidirectional screw; 15. Control console; 16. Mounting slot; 17. First slot; 18. Second slot; 19. Mounting block; 20. Connecting rod; 21. First fixing slot; 22. First connecting block; 23. First fixing rod; 24. First limiting slot; 25. Second limiting slot; 26. Control block; 27. Limiting rod; 28. Second fixing slot; 29. ​​Second connecting block; 30. Second fixing rod. Detailed Implementation

[0042] 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, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0043] Please see Figures 1 to 4 This utility model provides a new technical solution: a hydraulic bulging device for corrugated pipes, including a base 1, a placement groove 2 on the upper side of the base 1, a lower mold 3 on the upper side of the base 1, the lower side of the lower mold 3 extending into the interior of the placement groove 2, a lifting module 4 fixedly connected to the upper side of the base 1, a hydraulic rod 5 fixedly connected to the lower side of the lifting module 4 (both the lifting module 4 and the hydraulic rod 5 are existing structures and will not be explained in detail), a fixing shell 6 fixedly connected to the lower end of the hydraulic rod 5, an upper mold 7 on the lower side of the fixing shell 6, the upper side of the upper mold 7 extending into the interior of the fixing shell 6, and a sealing mechanism on the base 1. The sealing mechanism can seal the space between the lower mold 3 and the upper mold 7 and inject liquid. The sealing mechanism includes two sliding grooves 8 and two... The components include a slider 9, a sealing block 10, an injection block 11, a storage tank 12, a motor assembly 13, and a bidirectional screw 14. A lower fixing mechanism is provided on the base 1 to fix the lower mold 3 to the base 1. The lower fixing mechanism includes an installation groove 16, two first slots 17, two second slots 18, an installation block 19, two locking rods 20, two first fixing grooves 21, a first connecting block 22, and two first fixing rods 23. An upper fixing mechanism is provided on the fixed shell 6 and the upper mold 7 to fix the upper mold 7 to the fixed shell 6. The upper fixing mechanism includes two first limiting grooves 24, two second limiting grooves 25, a control block 26, two limiting rods 27, two second fixing grooves 28, a second connecting block 29, and two second fixing rods 30.

[0044] Furthermore, both sliding grooves 8 are formed inside the base 1, and are respectively located on the front and rear sides of the placement groove 2. Both sliding grooves 8 are T-shaped grooves. Two sliders 9 are slidably connected inside the two sliding grooves 8, and the two sliding grooves 8 extend from the upper sides of the two sliders 9. A sealing block 10 is fixedly connected to the rear side of the front slider 9, an injection block 11 is fixedly connected to the front side of the rear slider 9, a storage tank 12 is fixedly connected to the rear side of the base 1, and a water supply pipe connects the storage tank 12 and the injection block 11. A motor assembly 13 is fixedly connected to the front side of the base 1. The output end of component 13 is fixedly connected to a drive shaft. The rear end of the drive shaft extends rotatably into the interior of the slide groove 8. The bidirectional screw 14 is fixedly connected to the rear end of the motor assembly 13. The rear end of the bidirectional screw 14 rotatably passes through the interior of the rear slide groove 8. The rear end of the bidirectional screw 14 is rotatably connected to the rear wall of the rear slide groove 8. The bidirectional screw 14 is threaded through two sliders 9. The bidirectional screw 14 is composed of two threaded rods with opposite thread directions. The control console 15 is located on the left side of the base 1. The control console 15 can control the start and stop of the lifting module 4 and the motor assembly 13.

[0045] Furthermore, the mounting groove 16 is located on the left side of the base 1, and two first slots 17 are located on the right wall of the mounting groove 16, extending out of the right side of the base 1. Two second slots 18 are located inside the lower mold 3, extending out of the left and right sides of the lower mold 3 respectively. The two second slots 18 are respectively adapted to the two first slots 17. The mounting block 19 is located inside the mounting groove 16, and a handle is fixedly connected to the left side of the mounting block 19. Two locking rods 20 are fixedly connected to the right side of the mounting block 19, extending outwards... The two first slots 17 and two second slots 18 extend into the interior of the two first fixing slots 21, which are respectively opened inside the two locking rods 20. The two first fixing slots 21 extend out of the upper and lower sides of the two locking rods 20. The two first fixing slots 21 are both located on the right side of the base 1. The first connecting block 22 is located on the upper side of the two locking rods 20. The upper side of the first connecting block 22 is also fixedly connected with a handle. The two first fixing rods 23 are fixedly connected to the lower side of the first connecting block 22. The two first fixing rods 23 extend into the interior of the two first fixing slots 21.

[0046] Furthermore, both first limiting grooves 24 are formed on the left side of the fixed shell 6, and both first limiting grooves 24 extend out of the right side of the fixed shell 6. Both second limiting grooves 25 are set inside the upper mold 7, and both second limiting grooves 25 extend out of the left and right sides of the upper mold 7 respectively. The two second limiting grooves 25 and the two first limiting grooves 24 are adapted to each other. The control block 26 is set on the left side of the fixed shell 6, and the control block 26 has an operating groove. Both limiting rods 27 are fixedly connected to the right side of the control block 26, and the right ends of the two limiting rods 27 extend into the two... Inside the first limiting groove 24 and the two second limiting grooves 25, two second fixing grooves 28 are respectively opened inside the two limiting rods 27. The two second fixing grooves 28 extend out of the upper and lower sides of the two limiting rods 27 respectively. The second connecting block 29 is set on the upper side of the two limiting rods 27. The second connecting block 29 is set on the right side of the fixed shell 6. The second connecting block 29 is also provided with an operating groove. The two second fixing rods 30 are fixedly connected to the lower side of the second connecting block 29. The two second fixing rods 30 extend into the interior of the two second fixing grooves 28 respectively.

[0047] When starting work, the tube blank is first placed into the processing groove of the lower mold 3. Then, the lifting module 4 is started by controlling the control console 15. The lifting module 4 then drives the hydraulic rod 5 to extend. The hydraulic rod 5 drives the fixed shell 6 and the upper mold 7 to move downwards, so that the upper mold 7 will fit with the lower mold 3. Then, the motor assembly 13 is started by controlling the control console 15. The motor assembly 13 then drives the transmission shaft to rotate. The transmission shaft drives the bidirectional screw 14 to rotate. The bidirectional screw 14 drives the two threaded sliders 9 to move towards the opposite face. Then, the sealing block 10 and the liquid injection block 11 move to the processing groove to seal. Then, the liquid injection block 11 injects high-pressure liquid into the interior, so that the tube blank will undergo water expansion molding. Activating the lifting module 4 in the opposite direction can release the fit between the lower mold 3 and the upper mold 7, so that the processed corrugated pipe can be taken out.

[0048] When a mold needs to be replaced, the operator pulls the handle of the first connecting block 22 upwards. This causes the first connecting block 22 to move the first fixing rod 23 upwards, allowing it to move out of the first fixing groove 21. At this point, the limiting state between the first fixing rod 23 and the first fixing groove 21 is released. Then, the operator pulls the handle of the mounting block 19 to the left. This causes the mounting block 19 to move the locking rod 20 synchronously, allowing it to move out of the first locking groove 17 and the second locking groove 18. This releases the limiting state between the locking rod 20 and the first locking groove 17 and the second locking groove 18, allowing the lower mold 3 to be removed from the placement groove 2 for replacement. Afterwards, the operator moves the second connecting block 29 upwards via the operating groove on the second connecting block 29, causing the second connecting block 29 to move the second fixing rod 30. The second fixing rod 30 will move out from inside the second fixing groove 28. At this time, the limiting state between the second fixing rod 30 and the second fixing groove 28 will be released. Then, it will be moved to the left by the operating groove on the control block 26. The control block 26 will drive the limiting rod 27 to move to the left in sync. Then, the limiting rod 27 will move out from inside the first limiting groove 24 and the second limiting groove 25. Then, the limiting state between the limiting rod 27 and the first limiting groove 24 and the second limiting groove 25 will also be released. Then, the upper mold 7 will move out from inside the fixed shell 6. Then, the upper mold 7 can be replaced. In this way, the fixing mechanism of the mold can be quickly disassembled and installed, so that when changing the mold, less time will be wasted on the fixing mechanism of the mold, thereby improving the mold replacement efficiency of the bulging device.

[0049] Working principle: When starting work, the tube blank is first placed into the processing groove of the lower mold 3. Then, the lifting module 4 is started by the control console 15. The lifting module 4 then drives the hydraulic rod 5 to extend. The hydraulic rod 5 drives the fixed shell 6 and the upper mold 7 to move downward. Then, the upper mold 7 will fit with the lower mold 3. Then, the motor assembly 13 is started by the control console 15. The motor assembly 13 drives the transmission shaft to rotate. The transmission shaft drives the bidirectional screw 14 to rotate. The bidirectional screw 14 drives the two threaded sliders 9 to move towards the opposite face. Then, the sealing block 10 and the liquid injection block 11 will move to the processing groove to seal. Then, the liquid injection block 11 will inject high-pressure liquid into the interior. Then, the tube blank will undergo water expansion molding. Activating the lifting module 4 in the opposite direction can release the fit between the lower mold 3 and the upper mold 7, and then the processed corrugated pipe can be taken out.

[0050] When a mold needs to be replaced, the worker pulls the handle of the first connecting block 22 upwards. This causes the first connecting block 22 to move the first fixing rod 23 upwards, allowing it to move out of the first fixing groove 21. At this point, the limiting state between the first fixing rod 23 and the first fixing groove 21 is released. Then, the worker pulls the handle of the mounting block 19 to the left. This causes the mounting block 19 to move the locking rod 20 synchronously, allowing it to move out of the first locking groove 17 and the second locking groove 18. This releases the limiting state between the locking rod 20 and the first locking groove 17 and the second locking groove 18, allowing the lower mold 3 to be removed from the placement groove 2 for replacement. Afterwards, the second connecting block... The operating groove on the connecting block 29 moves it upward, which in turn causes the second connecting block 29 to move the second fixing rod 30. The second fixing rod 30 then moves out of the second fixing groove 28, and the limiting state between the second fixing rod 30 and the second fixing groove 28 is released. Then, the operating groove on the control block 26 moves it to the left, which in turn causes the control block 26 to move the limiting rod 27 to the left. The limiting rod 27 then moves out of the first limiting groove 24 and the second limiting groove 25, and the limiting state between the limiting rod 27 and the first limiting groove 24 and the second limiting groove 25 is also released. As a result, the upper mold 7 moves out of the fixed shell 6, and then the upper mold 7 can be replaced.

[0051] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A hydraulic bulging device for corrugated pipe, comprising a base (1), a placement groove (2) provided on the upper side of the base (1), a lower mold (3) provided on the upper side of the base (1), and the lower side of the lower mold (3) extending into the interior of the placement groove (2). A lifting module (4) is fixedly connected to the upper side of the base (1), a hydraulic rod (5) is fixedly connected to the lower side of the lifting module (4), and a fixed shell (6) is fixedly connected to the lower end of the hydraulic rod (5). An upper mold (7) is provided on the lower side of the fixed shell (6), and the upper side of the upper mold (7) extends into the interior of the fixed shell (6). The characteristic feature is that: The base (1) is provided with a sealing mechanism, which can seal the space between the lower mold (3) and the upper mold (7) and inject liquid. The sealing mechanism includes two slides (8), two sliders (9), a sealing block (10), a liquid injection block (11), a liquid storage tank (12), a motor assembly (13), and a bidirectional screw (14); The base (1) is provided with a lower fixing mechanism, which can fix the lower mold (3) on the base (1); The lower fixing mechanism includes a mounting slot (16), two first slots (17), two second slots (18), a mounting block (19), two locking rods (20), two first fixing slots (21), a first connecting block (22), and two first fixing rods (23); An upper fixing mechanism is provided on the fixed shell (6) and the upper mold (7), which can fix the upper mold (7) on the fixed shell (6); The upper fixing mechanism includes two first limiting grooves (24), two second limiting grooves (25), a control block (26), two limiting rods (27), two second fixing grooves (28), a second connecting block (29), and two second fixing rods (30).

2. The hydraulic bulging device for corrugated pipes according to claim 1, characterized in that: Both of the aforementioned grooves (8) are opened inside the base (1), and the two grooves (8) are respectively set on the front and rear sides of the placement groove (2). Both grooves (8) are T-shaped grooves. Two sliders (9) are slidably connected inside two grooves (8), and two grooves (8) extend from the upper side of the two sliders (9). A sealing block (10) is fixedly connected to the rear side of the front slider (9), and an injection block (11) is fixedly connected to the front side of the rear slider (9). The liquid storage tank (12) is fixedly connected to the rear side of the base (1), and a water supply pipe is connected between the liquid storage tank (12) and the liquid injection block (11). The motor assembly (13) is fixedly connected to the front side of the base (1).

3. The hydraulic bulging device for corrugated pipes according to claim 2, characterized in that: The output end of the motor assembly (13) is fixedly connected to a drive shaft, the rear end of which extends rotatably into the interior of the slide groove (8), and the bidirectional screw (14) is fixedly connected to the rear end of the motor assembly (13). The rear end of the double-ended screw (14) rotates through into the interior of the rear sliding groove (8), and the rear end of the double-ended screw (14) is rotatably connected to the rear wall of the rear sliding groove (8); A two-way screw (14) is threaded through two sliders (9), and a control console (15) is positioned on the left side of the base (1).

4. The hydraulic bulging device for corrugated pipes according to claim 1, characterized in that: The mounting slot (16) is located on the left side of the base (1), and the two first slots (17) are located on the right wall of the mounting slot (16), with the two first slots (17) extending out of the right side of the base (1). Both second slots (18) are opened inside the lower mold (3), and the two second slots (18) extend out of the left and right sides of the lower mold (3) respectively. The two second slots (18) are respectively adapted to the two first slots (17); The mounting block (19) is set inside the mounting slot (16). A handle is fixedly connected to the left side of the mounting block (19), and two snap-fit ​​rods (20) are fixedly connected to the right side of the mounting block (19).

5. The hydraulic bulging device for corrugated pipes according to claim 4, characterized in that: The two locking rods (20) extend into the interiors of the two first locking slots (17) and the two second locking slots (18), respectively, and the two first fixing slots (21) are respectively opened inside the two locking rods (20); Two first fixing slots (21) extend to the upper and lower sides of two snap-fit ​​rods (20) respectively. Both first fixing slots (21) are located on the right side of the base (1). The first connecting block (22) is located on the upper side of the two snap-fit ​​rods (20). The upper side of the first connecting block (22) is also fixedly connected with a handle, and the two first fixing rods (23) are fixedly connected to the lower side of the first connecting block (22), and the two first fixing rods (23) extend into the interior of the two first fixing grooves (21).

6. The hydraulic bulging device for corrugated pipes according to claim 1, characterized in that: Both first limiting grooves (24) are opened on the left side of the fixed shell (6), both first limiting grooves (24) extend out of the right side of the fixed shell (6), and both second limiting grooves (25) are set inside the upper mold (7). Two second limiting grooves (25) extend out of the left and right sides of the upper mold (7) respectively, and the two second limiting grooves (25) are compatible with the two first limiting grooves (24); The control block (26) is located on the left side of the fixed shell (6), and an operation slot is provided on the control block (26). Two limit rods (27) are fixedly connected to the right side of the control block (26).

7. A hydraulic bulging device for corrugated pipes according to claim 6, characterized in that: The right ends of the two limiting rods (27) extend into the interiors of the two first limiting grooves (24) and the two second limiting grooves (25), respectively, and the two second fixing grooves (28) are respectively opened inside the two limiting rods (27); Two second fixing grooves (28) extend to the upper and lower sides of two limiting rods (27) respectively, and a second connecting block (29) is set on the upper side of the two limiting rods (27). The second connecting block (29) is set on the right side of the fixing shell (6). The second connecting block (29) is also provided with an operating groove. The two second fixing rods (30) are fixedly connected to the lower side of the second connecting block (29). The two second fixing rods (30) extend into the interior of the two second fixing grooves (28).

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