Welding platform for automobile exhaust pipe

Abstract

The invention belongs to the technical field of automobiles, and particularly discloses a welding platform for an automobile exhaust pipe, which comprises a vertical welding machine, a screw rod mechanism is mounted on the surface of a vertical rod of the vertical welding machine, the surface of a screw rod of the screw rod mechanism is sleeved with a supporting table in a threaded manner, and a back plate is mounted in front of the supporting table through a bolt; two protruding plates are symmetrically installed at the bottom of the front portion of the back plate, a second platform is movably arranged between the two protruding plates, jacking mechanisms are arranged in the protruding plates, a first platform is movably arranged above the two protruding plates, and a flange clamping groove is formed in the middle end of the first platform. Through mutual cooperation of the first platform, the second platform and other elements, the exhaust pipe and the flange plate can be rapidly installed, the welding speed and efficiency can be greatly improved, the non-productive time is shortened, meanwhile, the exhaust pipe and the flange plate can be rapidly attached, and the quality of a welding seam and the connection firmness can be ensured.

Description

Technical Field

[0001] The invention belongs to the field of automobiles, and specifically discloses a welding platform for an automobile exhaust pipe. Background Art

[0002] The automobile exhaust pipe is part of the engine exhaust system, and its main function is to discharge the exhaust gas generated by the engine out of the vehicle. The exhaust pipe is usually made of stainless steel or high-strength steel, and is designed with multiple bends and mufflers inside to reduce noise and vibration. The exhaust pipe plays an important role in reducing vibration and noise and extending the life of the exhaust muffler system. As an important part of the engine exhaust system, the exhaust pipe needs to withstand high temperature and high pressure exhaust gas emissions, so its connection parts must have a high degree of sealing and strength. Welding can ensure a tight connection between the exhaust pipe and the flange to prevent leakage and loosening, thereby ensuring the normal operation and safety of the vehicle.

[0003] In the existing welding of automobile exhaust pipes, when the exhaust pipe is welded to the flange, the worker usually manually supports the exhaust pipe and then welds the joint between the exhaust pipe and the flange. This operation has high technical requirements for welders. If the welder is not skilled, it may lead to unstable weld quality, cracks, lack of fusion and other defects. In addition, the welder needs to operate in a small space, which not only increases the difficulty of operation, but also may lead to a decrease in welding quality due to inconvenient operation. Summary of the invention

[0004] In view of this, the purpose of the present invention is to propose a welding platform for automobile exhaust pipes to solve the problem that the prior art has high technical requirements for welders. If the welder's skills are not proficient, it may lead to unstable weld quality, cracks, lack of fusion and other defects, and the welder is required to operate in a small space, which not only increases the difficulty of operation, but also may lead to a decrease in welding quality due to inconvenient operation.

[0005] To achieve the above purpose, the present invention provides a welding platform for automobile exhaust pipes, including a vertical welding machine, a screw mechanism is installed on the surface of the vertical rod of the vertical welding machine, a support platform is threadedly sleeved on the screw surface of the screw mechanism, a back plate is installed in front of the support platform by bolts, two protruding plates are symmetrically installed at the bottom in front of the back plate, a second platform is movably arranged between the two protruding plates, a pipe fitting groove is opened on the surface of the second platform, a jacking mechanism is arranged inside the protruding plate, the jacking mechanism cooperates with the second platform, a first platform is movably arranged above the two protruding plates, a flange groove is opened at the middle end of the first platform, the flange groove is located directly above the pipe fitting groove, guide rods are fixedly installed at both ends of the bottom of the first platform, a descending groove is opened inside the protruding plate, the bottom of the guide rod is movably inserted in the descending groove, and the bottom of the guide rod cooperates with the jacking mechanism.

[0006] In the above technical solution, preferably, a T-shaped groove is provided on the surface of the back plate, a T-shaped slider is fixedly provided on the surface of the second platform close to the back plate, the T-shaped slider is slidably installed in the T-shaped groove, an exhaust pipe is installed inside the pipe slot, two semicircular clamping blocks are installed on the top of the second platform through a rotating shaft, the rear of the semicircular clamping blocks is connected to the second platform through a rotating shaft, the front ends of the two semicircular clamping blocks are both provided with positioning surfaces, the two positioning surfaces are fixedly connected by bolts, and the exhaust pipe is clamped between the two semicircular clamping blocks.

[0007] In the above technical scheme, preferably, the adjacent surfaces of the two protruding plates are each provided with a first opening, positioning pieces are fixedly installed on both sides of the first opening, and the inner wall of the descending groove is provided with side grooves, the lifting mechanism includes a swinging plate, the surface of the swinging plate is inserted into the descending groove through the first opening, and the middle end of the swinging plate is connected to the positioning piece through a rotating shaft, one end of the swinging plate located inside the descending groove is clamped in the side groove, and an arc spring is connected between the end surface of the swinging plate located inside the descending groove and the inner wall of the descending groove, and one end of the swinging plate located outside the descending groove is provided with a movable groove, a protruding block is fixedly installed on the end surface of the bottom of the second platform, a groove is provided in the middle of the protruding block, the surface of the swinging plate is movably clamped in the groove, and a light rod is provided in the groove, and the surface of the light rod is movably installed in the movable groove.

[0008] In the above technical solution, preferably, a flange plate is installed inside the flange slot, and two first protective strips are symmetrically installed at the bottom of the first platform and on both sides of the flange slot through a rotating axis, and the surface of the first protective strip is below the flange slot. Two tension spring grooves are symmetrically opened at the bottom of the first platform, and tension springs are arranged inside the tension spring grooves, and the bottom ends of the tension springs are fixedly connected to the middle of the first protective strip.

[0009] In the above technical solution, preferably, a linear slide groove is provided on the top of the first platform and on both sides of the flange slot, a second spring is arranged inside the linear slide groove, a rectangular slider is installed at one end of the second spring close to the flange slot, a second protective strip is fixedly installed on the top of the rectangular slider, the second protective strip is slidably installed on the upper surface of the first platform, an inclined groove is provided at one end of the second protective strip away from the flange slot, extrusion blocks are fixedly installed at both ends of the top of the back plate, and an inclined surface matching the inclined groove is provided at the bottom of the extrusion block.

[0010] In the above technical solution, preferably, a second opening is provided at the top of the protruding plate, a limiting plate is slidably arranged inside the second opening, a center groove is provided in the middle of the limiting plate, the surface of the guide rod is in the center groove, a second fixed frame is provided at the top of the limiting plate on the outer side of the protruding plate, a rectangular block is provided on the top of the guide rod, a first fixed frame is fixedly installed on the surface of the rectangular block, and a connecting rod is connected between the first fixed frame and the second fixed frame through a rotating shaft.

[0011] In the above technical solution, preferably, a through groove is opened on the surface of the back plate, a control block is fixedly installed on the back of the first platform, the surface of the control block moves through the through groove, a cylinder is installed on the top of the support platform by bolts, and the output end of the cylinder is fixedly connected to the control block.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] Through the mutual cooperation of the first platform, the second platform and other components, the staff can quickly install the exhaust pipe in the second platform, and the flange can also be quickly installed in the first platform, which can greatly improve the welding speed and efficiency and reduce non-productive time. After the welding is completed, the workpiece can also be quickly dismantled. Ordinary workers can start working after simple training, which reduces the dependence on professional welders. At the same time, the exhaust pipe and the flange can be quickly fitted, and the fitting effect is good, which can ensure the quality of the weld and the firmness of the connection, reduce welding errors, improve the welding quality of the product, and avoid excessive stress during the welding process, which may cause cracking, breakage or deformation of the weld. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0015] Figure 2 It is a schematic diagram of the structure of the backplane surface element of the present invention;

[0016] Figure 3 It is a schematic diagram of the back structure of the back plate of the present invention;

[0017] Figure 4 For the present invention Figure 2 Another perspective structural diagram;

[0018] Figure 5 It is a partial cross-sectional view of the front view of the back plate of the present invention;

[0019] Figure 6 For the present invention Figure 5 The enlarged view of point A in the middle;

[0020] Figure 7 For the present invention Figure 5 The enlarged view of point B in the middle;

[0021] Figure 8 For the present invention Figure 2 Enlarged view of point C in the middle.

[0022] In the figure: 1, vertical welding machine; 2, screw mechanism; 3, support platform; 4, back plate; 5, protruding plate; 6, lifting mechanism; 7, second platform; 8, pipe fitting slot; 9, semicircular clamp block; 10, protruding block; 11, swing plate; 12, movable slot; 13, descending slot; 14, first opening; 15, side slot; 16, arc spring; 17, first platform; 18, flange slot; 19, control block; 20, cylinder; 21, guide rod; 22, rectangular block; 23, first fixed frame; 24, connecting rod; 25, second fixed frame; 26, second opening; 27, limit plate; 28, center slot; 29, tension spring slot; 30, tension spring; 31, first protection strip; 32, linear slide; 33, second spring; 34, second protection strip; 35, inclined slot; 36, extrusion block. DETAILED DESCRIPTION

[0023] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0025] like Figure 1 - Figure 8 A welding platform for automobile exhaust pipes shown in the figure comprises a vertical welding machine 1, a screw mechanism 2 is installed on the surface of the vertical rod of the vertical welding machine 1, a support platform 3 is threadedly sleeved on the screw surface of the screw mechanism 2, a back plate 4 is installed in front of the support platform 3 by bolts, two protruding plates 5 are symmetrically installed at the bottom in front of the back plate 4, a second platform 7 is movably arranged between the two protruding plates 5, a pipe fitting slot 8 is provided on the surface of the second platform 7, a lifting mechanism 6 is provided inside the protruding plate 5, the lifting mechanism 6 cooperates with the second platform 7, a first platform 17 is movably arranged above the two protruding plates 5, a flange slot 18 is provided at the middle end of the first platform 17, and the method The flange groove 18 is located directly above the pipe groove 8, guide rods 21 are fixedly installed at both ends of the bottom of the first platform 17, a descending groove 13 is opened inside the protruding plate 5, the bottom of the guide rod 21 is movably inserted in the descending groove 13, and the bottom of the guide rod 21 cooperates with the jacking mechanism 6. Through the mutual cooperation of the first platform 17, the second platform 7 and other components, the exhaust pipe and the flange can be quickly installed, which can greatly improve the welding speed and efficiency, reduce non-productive time, and at the same time, the exhaust pipe and the flange can be quickly fitted, and the fitting effect is good, which can ensure the quality of the weld and the firmness of the connection, reduce welding errors, and improve the welding quality of the product.

[0026] A T-shaped groove is provided on the surface of the back plate 4, and a T-shaped slider is fixedly provided on the surface of the second platform 7 close to the back plate 4. The T-shaped slider is slidably installed in the T-shaped groove, and an exhaust pipe is installed inside the pipe slot 8, so that the second platform 7 can slide up and down stably on the surface of the back plate 4, so that the exhaust pipe can also be stably displaced up and down on the surface of the back plate 4. Two semicircular clamping blocks 9 are installed on the top of the second platform 7 through a rotating shaft, and the rear of the semicircular clamping blocks 9 is connected to the second platform 7 through a rotating shaft. The front ends of the two semicircular clamping blocks 9 are both provided with positioning surfaces, and the two positioning surfaces are fixedly connected by bolts. The exhaust pipe is clamped between the two semicircular clamping blocks 9, and the staff can clamp the exhaust pipe through the two semicircular clamping blocks 9 to fix the exhaust pipe in the pipe slot 8.

[0027] The adjacent surfaces of the two protruding plates 5 are each provided with a first opening 14, and positioning pieces are fixedly installed on both sides of the first opening 14. The inner wall of the descending groove 13 is provided with a side groove 15. The lifting mechanism 6 includes a swing plate 11. The surface of the swing plate 11 is inserted into the descending groove 13 through the first opening 14, and the middle end of the swing plate 11 is connected to the positioning piece through a rotating shaft. One end of the swing plate 11 inside the descending groove 13 is clamped in the side groove 15, and an arc spring 16 is connected between the end surface of the swing plate 11 inside the descending groove 13 and the inner wall of the descending groove 13. When the guide rod 21 moves downward, the downward pressure of the guide rod 21 can press down one end of the swing rod 11 inside the descending groove 13. At this time, the swing rod 11 as a whole is fixed with the positioning piece The second platform 7 is lifted up and moved upward by the end of the swing plate 11 outside the descending groove 13. A movable groove 12 is provided at the end of the swing plate 11 outside the descending groove 13. A protruding block 10 is fixedly installed on the end surface of the bottom of the second platform 7. A slot is provided in the middle of the protruding block 10. The surface of the swing plate 11 is movably clamped in the slot, and a light rod is provided in the slot. The surface of the light rod is movably installed in the movable slot 12. Through the cooperation of the light rod and the slot, the swing plate 11 can be connected to the second platform 7 to ensure the stability of the swing rod 11 when supporting the second platform 7.

[0028] A flange is installed inside the flange slot 18, and the flange slot 18 corresponds to the flange, and the flange can be directly snapped into the flange slot 18. Two first protective strips 31 are symmetrically installed at the bottom of the first platform 17 and on both sides of the flange slot 18 through a rotating axis. The surface of the first protective strip 31 is below the flange slot 18. Two tension spring grooves 29 are symmetrically provided at the bottom of the first platform 17. A tension spring 30 is arranged inside the tension spring groove 29. The bottom end of the tension spring 30 is fixedly connected to the middle part of the first protective strip 31. The tension of the tension spring 30 can pull the first protective strip 31 upward, so that the upper surface of the first protective strip 31 is close to the bottom of the first platform 17, and the first protective strip 31 has a supporting effect on the flange.

[0029] A linear slide 32 is provided on the top of the first platform 17 and on both sides of the flange slot 18, a second spring 33 is provided inside the linear slide 32, a rectangular slider is installed at one end of the second spring 33 close to the flange slot 18, a second protective strip 34 is fixedly installed on the top of the rectangular slider, the second protective strip 34 is slidably installed on the upper surface of the first platform 17, an inclined groove 35 is provided at one end of the second protective strip 34 away from the flange slot 18, extrusion blocks 36 are fixedly installed at both ends of the top of the back plate 4, an inclined surface matching the inclined groove 35 is provided at the bottom of the extrusion block 36, When the first platform 17 moves to the top as a whole, the inclined surface at the bottom of the extrusion block 36 has an extrusion effect on the inclined groove 35, so that the second protective strip 34 can move to the side of the first platform 17. At this time, the second protective strip 34 is removed from the top of the flange slot 18, and the flange slot 18 is in an open state.

[0030] A second opening 26 is provided at the top of the protruding plate 5, and a limit plate 27 is slidably provided inside the second opening 26. A center groove 28 is provided in the middle of the limit plate 27. The surface of the guide rod 21 is in the center groove 28. A second fixed frame 25 is provided at the top of the limit plate 27 on the outside of the protruding plate 5. A rectangular block 22 is provided at the top of the guide rod 21. A first fixed frame 23 is fixedly installed on the surface of the rectangular block 22. A connecting rod 24 is connected between the first fixed frame 23 and the second fixed frame 25 through a rotating shaft. When the first platform 17 moves to the top as a whole, the guide rod 21 drives the rectangular block 22 to rise. Under the action of the connecting rod 24, the rectangular block 22 is moved upward. The lower limit plate 27 will move toward the middle of the back plate 4. At this time, the two limit plates 27 have a limiting effect on the exhaust pipe. When the staff positions the exhaust pipe, the top of the exhaust pipe can be against the bottom of the two limit plates 27, so the exhaust pipe can be quickly limited to ensure the uniformity of the connection position of the exhaust pipe and the flange. When the first platform 17 moves downward as a whole, the guide rod 21 drives the rectangular block 22 to descend. Under the action of the connecting rod 24, the limit plate 27 will move to the side of the back plate 4. At this time, the two limit plates 27 are moved away from the top of the exhaust pipe to avoid the limit plates 27 blocking the exhaust pipe when the second platform 7 is lifted.

[0031] A through groove is provided on the surface of the back plate 4, and a control block 19 is fixedly installed on the back of the first platform 17. The surface of the control block 19 is movable through the through groove. A cylinder 20 is installed on the top of the support platform 3 by bolts, and the output end of the cylinder 20 is fixedly connected to the control block 19. Through the cylinder 20, the rise and fall of the first platform 17 can be controlled.

[0032] Working principle: First, the staff places the flange in the flange slot 18, then clamps the surface of the exhaust pipe in the pipe slot 8, and then presses the top of the exhaust pipe against the bottom of the two limit plates 27, and then clamps the exhaust pipe through two semicircular clamping blocks 9 to complete the positioning of the exhaust pipe. Then the cylinder 20 drives the first platform 17 to move downward. During the downward movement of the first platform 17, the bottom of the extrusion block 36 is separated from the inclined groove 35, and the elastic force of the second spring 33 can push the rectangular slider in the direction of the flange slot 18. At the same time, the second protective strip 34 can also move in the direction of the flange slot 18, so that the end of the second protective strip 34 can be set on the flange The flange is positioned above the slot 18, and the guide rod 21 drives the rectangular block 22 to descend. Under the action of the connecting rod 24, the limit plate 27 will move to the side of the back plate 4. At this time, the two limit plates 27 are moved away from the top of the exhaust pipe, and the first platform 17 continues to move downward. The bottom of the guide rod 21 can press down one end of the swing rod 11 inside the descending groove 13. At this time, the swing rod 11 rotates as a whole with the rotating shaft on the surface of the positioning piece as the center, and the end of the swing rod 11 inside the descending groove 13 moves downward, and at the same time, the end of the swing rod 11 outside the descending groove 13 rises, and the end of the swing rod 11 outside the descending groove 13 will lift the second platform 7 to move upward, so that After the first platform 17 descends, the second platform 7 will also move up. At this time, the top of the exhaust pipe will be plugged into the inside of the flange. In the next step, the flange and the exhaust pipe will be welded and fixed under the action of the welding device on the top of the vertical welding machine. Finally, the cylinder 20 drives the first platform 17 to move upward. Under the action of the arc spring 16, the swing plate 11 will return to its original state. The end surface of the swing plate 11 inside the side groove 15 will rest against the top of the side groove 15. At this time, the swing plate 11 is in a horizontal state, and the second platform 7 will also move downward at the same time. When the second platform 7 drives the exhaust pipe to move downward, since the exhaust pipe is welded and fixed to the flange, and under the action of the tension spring 30, the exhaust pipe will also The flange is driven down, and the flange has an extrusion effect on the first protection strip 31 at this time. The first protection strip 31 gradually opens, and the flange can be separated from the flange slot 18. At this time, the staff opens the semicircular clamping block 9 and takes out the exhaust pipe and the flange. Then the cylinder 20 drives the first platform 17 to continue to move upward, and the guide rod 21 drives the rectangular block 22 to rise. Under the action of the connecting rod 24, the limit plate 27 will move toward the middle of the back plate 4. At the same time, the inclined surface of the bottom of the extrusion block 36 has an extrusion effect on the inclined groove 35, so that the second protection strip 34 can move to the side of the first platform 17. At this time, the second protection strip 34 is removed from the top of the flange slot 18, and the flange slot 18 is in an open state.

[0033] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention, and these changes and improvements fall within the scope of the present invention claimed.

Claims

1. A welding platform for automobile exhaust pipes, comprising a vertical welding machine (1), characterized in that: A screw mechanism (2) is installed on the surface of the vertical rod of the vertical welding machine (1), a support platform (3) is threadedly sleeved on the screw surface of the screw mechanism (2), a back plate (4) is installed in front of the support platform (3) by bolts, two protruding plates (5) are symmetrically installed at the bottom in front of the back plate (4), a second platform (7) is movably arranged between the two protruding plates (5), a pipe fitting slot (8) is provided on the surface of the second platform (7), a lifting mechanism (6) is arranged inside the protruding plate (5), and the lifting mechanism (6) and the second platform ( 7), a first platform (17) is movably provided above the two protruding plates (5), a flange groove (18) is provided at the middle end of the first platform (17), and the flange groove (18) is located directly above the pipe groove (8), guide rods (21) are fixedly installed at both ends of the bottom of the first platform (17), a descending groove (13) is provided inside the protruding plate (5), the bottom of the guide rod (21) is movably inserted into the descending groove (13), and the bottom of the guide rod (21) is matched with the jacking mechanism (6).

2. A welding platform for automobile exhaust pipe according to claim 1, characterized in that: A T-shaped groove is provided on the surface of the back plate (4); a T-shaped slider is fixedly provided on the surface of the second platform (7) close to the back plate (4); the T-shaped slider is slidably installed in the T-shaped groove; an exhaust pipe is installed inside the pipe clamping groove (8); two semicircular clamping blocks (9) are installed on the top of the second platform (7) via a rotating shaft; the rear of the semicircular clamping blocks (9) is connected to the second platform (7) via a rotating shaft; positioning surfaces are installed at the front ends of the two semicircular clamping blocks (9); the two positioning surfaces are fixedly connected by bolts; and the exhaust pipe is clamped between the two semicircular clamping blocks (9).

3. A welding platform for automobile exhaust pipe according to claim 2, characterized in that: The adjacent surfaces of the two protruding plates (5) are each provided with a first opening (14), positioning plates are fixedly mounted on both sides of the first opening (14), the inner wall of the descending groove (13) is provided with a side groove (15), the lifting mechanism (6) comprises a swing plate (11), the surface of the swing plate (11) is inserted into the descending groove (13) through the first opening (14), and the middle end of the swing plate (11) is connected to the positioning plate via a rotating shaft, and one end of the swing plate (11) located inside the descending groove (13) is clamped in the side groove (15). An arc spring (16) is connected between the end surface of the swing plate (11) located inside the descending groove (13) and the inner wall of the descending groove (13); a movable groove (12) is provided at one end of the swing plate (11) located outside the descending groove (13); a protruding block (10) is fixedly mounted on the end surface of the bottom of the second platform (7); a slot is provided in the middle of the protruding block (10); the surface of the swing plate (11) is movably engaged in the slot; a polished rod is provided in the slot; and the surface of the polished rod is movably mounted in the movable groove (12).

4. A welding platform for automobile exhaust pipe according to claim 3, characterized in that: A flange plate is installed inside the flange slot (18); two first protection strips (31) are symmetrically installed at the bottom of the first platform (17) and on both sides of the flange slot (18) through a rotating axis; the surface of the first protection strip (31) is below the flange slot (18); two tension spring slots (29) are symmetrically opened at the bottom of the first platform (17); a tension spring (30) is arranged inside the tension spring slot (29); and the bottom end of the tension spring (30) is fixedly connected to the middle of the first protection strip (31).

5. A welding platform for automobile exhaust pipe according to claim 4, characterized in that: A linear slide groove (32) is provided on the top of the first platform (17) and on both sides of the flange groove (18), a second spring (33) is provided inside the linear slide groove (32), a rectangular slider is installed at one end of the second spring (33) close to the flange groove (18), a second protective strip (34) is fixedly installed on the top of the rectangular slider, the second protective strip (34) is slidably installed on the upper surface of the first platform (17), an inclined groove (35) is provided at one end of the second protective strip (34) away from the flange groove (18), and extrusion blocks (36) are fixedly installed at both ends of the top of the back plate (4), and an inclined surface matching the inclined groove (35) is provided at the bottom of the extrusion block (36).

6. A welding platform for automobile exhaust pipe according to claim 5, characterized in that: A second opening (26) is provided at the top of the protruding plate (5), a limiting plate (27) is slidably provided inside the second opening (26), a central groove (28) is provided in the middle of the limiting plate (27), the surface of the guide rod (21) is located in the central groove (28), a second fixed frame (25) is provided at the top of the limiting plate (27) on the outer side of the protruding plate (5), a rectangular block (22) is provided at the top of the guide rod (21), a first fixed frame (23) is fixedly installed on the surface of the rectangular block (22), and a connecting rod (24) is connected between the first fixed frame (23) and the second fixed frame (25) via a rotating shaft.

7. A welding platform for automobile exhaust pipe according to claim 6, characterized in that: A through groove is provided on the surface of the back plate (4); a control block (19) is fixedly mounted on the back of the first platform (17); the surface of the control block (19) movably passes through the through groove; a cylinder (20) is mounted on the top of the support platform (3) by means of bolts; the output end of the cylinder (20) is fixedly connected to the control block (19).

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