Plasma welding system for processing of agricultural machinery silencers

Abstract

This invention relates to the field of muffler processing technology and discloses a plasma welding system for processing agricultural machinery mufflers. The system includes a worktable with a vertical plate fixedly mounted on it. A clamp, a clamping frame, and a plasma welding gun are provided on the worktable. An exhaust pipe is provided on the muffler housing. A clamping assembly is provided in the clamping frame. The clamping assembly clamps and fixes the muffler housing and the exhaust pipe, ensuring stability between them when the plasma welding gun welds the connection between the muffler housing and the exhaust pipe, preventing tilting at the connection. This invention uses the clamping frame and clamping assembly to bidirectionally clamp the upper half of the muffler housing and the lower half of the exhaust pipe, preventing tilting at the connection during welding. A third clamping plate further fixes the upper half of the exhaust pipe, especially addressing the tilting curvature at the pipe's tail, ensuring the pipe is aligned and eliminating welding position deviations.

Description

Technical Field

[0001] This invention relates to the field of muffler processing technology, specifically a plasma welding system for processing mufflers for agricultural machinery. Background Technology

[0002] A muffler is a noise reduction device that uses pipes with sound-absorbing linings or pipes with sudden changes in cross-sectional area or other discontinuous acoustic impedance to attenuate or reflect noise from airflow ducts that also transmit noise. In the field of agricultural machinery, the muffler is a key component for reducing engine exhaust noise, and its performance directly affects the operating comfort and environmental performance of the machinery.

[0003] In the manufacturing process of mufflers for agricultural machinery, the welding quality of the muffler housing and the exhaust pipe is the core factor determining the reliability of the product. Currently, plasma welding technology is often used to achieve a firm connection between the two. However, the clamping and fixing methods for the muffler housing and the exhaust pipe during the welding process are relatively simple and it is difficult to accurately control their relative positions. In particular, the tail end of the exhaust pipe on agricultural machinery generally has an inclined arc, and traditional clamps cannot effectively align the pipe, which makes the components prone to displacement or tilting during welding, resulting in quality problems such as incomplete welding and weld misalignment, which seriously affect the sealing performance and service life of the muffler. Summary of the Invention

[0004] The purpose of this invention is to provide a plasma welding system for processing mufflers of agricultural machinery, so as to solve the problems mentioned in the background art.

[0005] Technical solution

[0006] This invention provides the following technical solution: a plasma welding system for processing mufflers of agricultural machinery, comprising a worktable, a vertical plate fixedly installed on the worktable, a clamp, a clamping frame and a plasma welding gun provided on the worktable, a muffler housing provided outside the clamp, an exhaust pipe provided on the muffler housing, and a clamping assembly provided in the clamping frame. When two adjacent clamping frames approach each other, the clamping assembly clamps and fixes the muffler housing and the exhaust pipe, ensuring that the clamping assembly can guarantee the stability between the two when the plasma welding gun welds the connection between the muffler housing and the exhaust pipe, and preventing the connection between the muffler housing and the exhaust pipe from tilting.

[0007] The clamping assembly includes a first clamping plate and a second clamping plate. The first clamping plate clamps the upper half of the muffler housing, and the second clamping plate clamps the lower half of the exhaust pipe. The first clamping plate and the second clamping plate together ensure the stability of the muffler housing and the exhaust pipe during welding.

[0008] Preferably, the clamping frame is provided with an arc-shaped groove and an unlocking component, a sliding post is provided in the arc-shaped groove, the first clamping plate and the second clamping plate are both provided on the sliding post, and the unlocking component is located on the side of the sliding post.

[0009] Preferably, the unlocking component includes a fixed frame, a fixed rod is provided in the fixed frame, an unlocking block and a compression spring are provided on the outside of the fixed rod, a limit post is provided on the side of the unlocking block, and a snap-fit ​​groove matching the limit post is provided on the sliding post.

[0010] Preferably, the upright plate is provided with a movable plate, a partition plate and a stabilizing component, a first rotating gear is provided below the movable plate, the plasma welding gun is fixedly connected to the first rotating gear, a push column is provided below the first rotating gear, an arc-shaped plate is provided below the push column, and an inclined edge is provided on the side of the arc-shaped plate.

[0011] Preferably, a second motor and a rack column are provided above the movable plate, and a second rotating gear is provided on the second motor, with the first rotating gear meshing with the second rotating gear.

[0012] Preferably, when the first rotating gear rotates, it will drive the pushing column to contact the sliding column, and through the arc plate and the unlocking component, it will drive the sliding column to rotate from static to moving in the arc groove, which facilitates the plasma welding gun to complete the welding of the muffler housing and the exhaust pipe.

[0013] Preferably, the stabilizing component includes a lead screw, and a third rotating gear is provided at the end of the lead screw, the third rotating gear being meshed with a rack column.

[0014] Preferably, a third clamping plate is provided on the outside of the lead screw, which clamps the upper half of the exhaust pipe to ensure the stability of the upper half of the exhaust pipe.

[0015] Preferably, the partition is located above the clamping assembly and below the movable plate, and the partition has a passage cavity.

[0016] Preferably, the workbench is further provided with a movable column and a first motor. The movable column is fixedly connected to the clamping frame, and the movable column is provided with a toothed column, which meshes with the gear on the first motor.

[0017] Beneficial effects

[0018] Compared with the prior art, the present invention provides a plasma welding system for processing agricultural machinery mufflers, which has the following beneficial effects:

[0019] 1. In this invention, the upper half of the muffler housing and the lower half of the exhaust pipe are clamped in both directions by the clamping frame and the clamping assembly to prevent the connection from tilting during welding; the third clamping plate further fixes the upper half of the exhaust pipe, especially for the tilting arc of the pipe tail, to ensure that the pipe is straight and eliminate welding position deviation.

[0020] 2. In this invention, two semi-circular clamping frames are combined to form a circular groove. When the sliding column rotates in the arc groove, the clamping plate rotates synchronously with the muffler housing and the pipe, ensuring that the components are always stably fitted during the welding process and preventing welding defects caused by shaking.

[0021] It should be understood that the foregoing general description and the following detailed description are exemplary and illustrative only, and are not intended to limit this disclosure.

[0022] This application provides an overview of various implementations or examples of the technology described in this disclosure, and is not a full disclosure of the entire scope or all features of the disclosed technology. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0024] Figure 1 This is a schematic diagram of the welding process between the muffler housing and the exhaust pipe in the overall structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the overall structure of the muffler housing and exhaust pipe before welding.

[0026] Figure 3 This is a bottom view of the worktable of the present invention;

[0027] Figure 4 This is a top view of the movable plate of the present invention;

[0028] Figure 5 This is a bottom view of the movable plate of the present invention;

[0029] Figure 6 This is a working diagram of the first clamping plate and the second clamping plate in the clamping frame of the present invention;

[0030] Figure 7 This is a diagram showing the connection between the unlocking component and the sliding column of the present invention;

[0031] Figure 8 This is a schematic diagram showing the contact between the movable plate and the partition plate of the present invention;

[0032] Figure 9For the present invention Figure 8 Enlarged view of point A in the middle;

[0033] Figure 10 For the present invention Figure 8 Enlarged view at point B in the middle;

[0034] Figure 11 This is a schematic diagram of the welding gun of the present invention in operation.

[0035] Explanation of reference numerals in the attached figures:

[0036] In the diagram: 1. Workbench; 2. Vertical plate; 3. Muffler housing; 4. Exhaust pipe; 5. Moving column; 6. Clamping frame; 7. Movable plate; 8. Third clamping plate; 9. Partition plate; 10. First clamping plate; 11. Second clamping plate; 12. Arc plate; 13. First motor; 14. First rotating gear; 15. Plasma welding gun; 16. Push column; 17. Second motor; 18. Rack column; 19. Second rotating gear; 20. Inclined edge; 21. Arc groove; 22. Sliding column; 23. Fixed frame; 24. Unlocking block; 25. Fixed rod; 26. Compression spring; 27. Limiting column; 28. Snap-fit ​​groove; 29. ​​Lead screw; 30. Third rotating gear; 31. Fixture. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Example:

[0039] Please see Figures 1-11 This invention provides a technical solution: a plasma welding system for processing mufflers of agricultural machinery, including a worktable 1, a vertical plate 2 fixedly installed on the worktable 1, a clamp 31 fixedly installed on the worktable 1, and a clamping frame 6 and a plasma welding gun 15 movably installed thereon. A muffler housing 3 is placed outside the clamp 31, and the inner diameter of the clamp 31 is equal to the outer diameter of the muffler housing 3. An exhaust pipe 4 is on the muffler housing 3. A clamping component is provided in the clamping frame 6. When two adjacent clamping frames 6 are close together, the clamping component will clamp and fix the muffler housing 3 and the exhaust pipe 4, ensuring that the clamping component can guarantee the stability between the two when the plasma welding gun 15 welds the connection between the muffler housing 3 and the exhaust pipe 4, and preventing the connection between the muffler housing 3 and the exhaust pipe 4 from tilting.

[0040] The clamping assembly includes a first clamping plate 10 and a second clamping plate 11. The first clamping plate 10 clamps the upper half of the muffler housing 3, and the second clamping plate 11 clamps the lower half of the exhaust pipe 4. The first clamping plate 10 and the second clamping plate 11 together ensure the stability of the muffler housing 3 and the exhaust pipe 4 during welding.

[0041] In this embodiment, the clamping frame 6 is provided with an arc-shaped groove 21 and an unlocking component. The clamping frame 6 is semi-circular in shape. When two clamping frames 6 are in contact, they form a circle. That is, when two clamping frames 6 are in contact, the two arc-shaped grooves 21 are connected and form a complete circular groove, which makes it easy for the two sliding posts 22 to rotate a full circle in the arc-shaped groove 21 and return to their original position. The sliding posts 22 are movably installed in the arc-shaped groove 21. The sliding posts 22 are T-shaped, and the width of the sliding posts 22 is the largest at one end in the arc-shaped groove 21, which can prevent the sliding posts 22 from detaching from the arc-shaped groove 21 when moving in the arc-shaped groove 21. The first clamping plate 10 and the second clamping plate 11 are both fixedly installed on the same side of the sliding posts 22. The sliding posts 22 are F-shaped, and the first clamping plate 10 is located below the second clamping plate 11. The unlocking component is located on the outer ring side of the sliding posts 22.

[0042] In this embodiment, the unlocking component includes a fixed frame 23, which is fixedly installed at the top of the clamping frame 6 and close to the outer ring side of the clamping frame 6. The fixed frame 23 is located near the arc groove 21 but is not connected to the arc groove 21. A fixed rod 25 is fixedly installed in the fixed frame 23. An unlocking block 24 and a compression spring 26 are movably installed on the outside of the fixed rod 25, and the unlocking block 24 is located above the compression spring 26. A limit post 27 is fixedly installed on the side of the unlocking block 24. A locking groove 28 matching the limit post 27 is opened on the sliding post 22. When the unlocking block 24 moves downward, it will squeeze the compression spring 26 and drive the limit post 27 to move downward as well. When the limit post 27 moves downward, it will disengage from the locking groove 28 in the sliding post 22, so that the sliding post 22 can move in the arc groove 21.

[0043] The unlocking component is linked with the inclined side of the arc plate 12. During welding, the arc plate 12 rotates and presses the unlocking block 24, causing the sliding column 22 to disengage from the limit position, allowing the clamping plate to rotate synchronously with the plasma welding gun 15, achieving 360° rotation welding, and ensuring that the welding at the joint is uniform and without dead corners.

[0044] In this embodiment, a movable plate 7 and a stabilizing component are movably installed on the upright plate 2, and a partition 9 is fixedly installed. A first rotating gear 14 is movably installed below the movable plate 7. A plasma welding gun 15 is fixedly installed at the bottom end of the first rotating gear 14. At the same time, a push column 16 is also fixedly installed at the bottom end of the first rotating gear 14. The plasma welding gun 15 and the push column 16 do not contact each other and do not interfere with each other. An arc-shaped plate 12 is fixedly installed at the bottom end of the push column 16. The plasma welding gun 15 is located on the inner ring side of the arc-shaped plate 12. The arc-shaped plate 12 can act as a protective baffle when the plasma welding gun 15 is performing welding work, to prevent high-temperature spatter generated when the plasma welding gun 15 is working, and to improve the safety of the plasma welding gun 15 when it is working. An inclined edge 20 is provided on the side of the arc-shaped plate 12.

[0045] A lifting motor or telescopic cylinder is fixedly installed on the rear side of the upright plate 2. The lifting motor or telescopic cylinder is mainly used to provide power for the up and down movement of the movable plate 7.

[0046] In this embodiment, a second motor 17 and a rack column 18 are fixedly installed on the upper part of the movable plate 7. The output shaft of the second motor 17 passes through the movable plate 7 and a second rotating gear 19 is fixedly installed thereon. The first rotating gear 14 and the second rotating gear 19 are meshed and connected. When the second motor 17 is working, it can drive the first rotating gear 14 to rotate through the second rotating gear 19, thereby driving the plasma welding gun 15 to perform rotational welding on the connection between the muffler housing 3 and the exhaust pipe 4, ensuring stability when welding the connection between the muffler housing 3 and the exhaust pipe 4.

[0047] In this embodiment, when the first rotating gear 14 rotates, it will drive the pushing column 16 to contact the sliding column 22, and through the arc plate 12 and the unlocking component, it will drive the sliding column 22 to rotate from static to moving in the arc groove 21, so that the plasma welding gun 15 can complete the welding of the muffler housing 3 and the exhaust pipe 4.

[0048] The arc plate 12 is located above the unlocking block 24. When the arc plate 12 rotates around the central axis of the muffler housing 3, it will contact the unlocking block 24 through the inclined side 20 and passively press the unlocking block 24 through the inclined side 20, so that the unlocking block 24 moves down into the fixed frame 23, so that the limiting post 27 and the sliding post 22 are separated, and the sliding post 22 can rotate in the clamping frame 6.

[0049] The side of the unlocking block 24 near the inclined edge 20 on the curved plate 12 also has an inclined edge 20, which facilitates the contact between the curved plate 12 and the unlocking block 24.

[0050] In this embodiment, the stabilizing component includes a lead screw 29, which is movably mounted on the vertical plate 2. A third rotating gear 30 is fixedly mounted at the end of the lead screw 29, and the third rotating gear 30 is meshed with the rack column 18.

[0051] In this embodiment, a third clamping plate 8 is threadedly connected to the outer side of the lead screw 29. The third clamping plate 8 clamps the upper half of the exhaust pipe 4 to ensure the stability of the upper half of the exhaust pipe 4.

[0052] When the movable plate 7 is not lowered, the distance between the two adjacent third clamping plates 8 is the farthest, and this distance is greater than the width of the movable plate 7. When the movable plate 7 is lowered, and the rack column 18 on the movable plate 7 contacts the third rotating gear 30, the lead screw 29 will be driven to rotate. After the lead screw 29 rotates, it will drive the third clamping plate 8 to move, and the two adjacent third clamping plates 8 will clamp the upper half of the exhaust pipe 4, further clamping and fixing the exhaust pipe 4.

[0053] In agricultural machinery, the muffler is usually connected to the exhaust pipe, and the tail end of the exhaust pipe 4 has an inclined arc, so when the exhaust pipe 4 is aligned, the exhaust pipe 4 will tilt towards the arc side. The function of the third clamping plate 8 is to provide support for the alignment and stability of the exhaust pipe 4.

[0054] In this embodiment, the partition 9 is located above the clamping assembly and below the movable plate 7. A passage cavity is provided in the partition 9, which facilitates the rotation of the arc plate 12 and the descent of the arc plate 12. It also provides a point for the plasma welding gun 15 to perform welding work.

[0055] A through hole is provided in the movable plate 7, and the diameter of the through hole is larger than the diameter of the inclined part at the tail end of the exhaust pipe 4.

[0056] In this embodiment, a movable column 5 is also movably installed in the workbench 1. The movable column 5 passes through the workbench 1, and a first motor 13 is fixedly installed at the bottom of the workbench 1. The movable column 5 is fixedly connected to the clamping frame 6, and a toothed column is fixedly installed on the movable column 5. The toothed column is meshed with the gear on the first motor 13. When the first motor 13 is working, it can drive the movable column 5 to work through the gear and the toothed column, thereby driving the clamping frame 6 to move.

[0057] By using multiple fixing components, such as clamping and stabilizing components, problems such as welding position misalignment and incomplete welding caused by component shaking are eliminated, thereby improving the strength and sealing of the connection between the muffler and the exhaust pipe and ensuring the reliability of the exhaust system of agricultural machinery.

[0058] The working principle of this embodiment is as follows: In use, firstly, the muffler housing 3 is placed on the clamp 31 on the workbench 1. Then, the exhaust pipe 4 is positioned correctly on the muffler housing 3. The first motor 13 starts working, driving two moving columns 5 to move on the workbench 1 via gears and pinions. As the two moving columns 5 move, they bring the two clamping frames 6 closer together. When the two clamping frames 6 are close together, the first clamping plate 10 clamps the upper half of the muffler housing 3, and the second clamping plate 11... The lower half of the exhaust pipe 4 will be clamped and fixed. Then, the movable plate 7 will move down under the operation of the power component. The movable plate 7 moves down to the partition plate 9. When it is close to the partition plate 9, the rack column 18 on the movable plate 7 will mesh with the third rotating gear 30, thereby driving the lead screw 29 to rotate. After the lead screw 29 rotates, it will drive the third clamping plate 8 to clamp and fix the upper half of the exhaust pipe 4. When the movable plate 7 contacts the partition plate 9, the third clamping plate 8 completes the clamping and fixing of the exhaust pipe 4.

[0059] Subsequently, the second motor 17 starts working. After the second motor 17 starts working, it drives the first rotating gear 14 to rotate through the second rotating gear 19. When the first rotating gear 14 rotates, it drives the push column 16 and the arc plate 12 to start rotating. At the same time, the plasma welding gun 15 will also perform welding work on the connection between the muffler housing 3 and the exhaust pipe 4. When the arc plate 12 rotates, it will contact the unlocking block 24 through the inclined side 20. As the arc plate 12 continues to move, the arc plate 12 will drive the unlocking block 24 to move downward through the inclined side 20. When the unlocking block 24 moves downward, it will squeeze the compression spring 26. At the same time, the unlocking block 24 will drive the limiting column 27 to separate from the sliding column 22's locking groove 28. In this way, the sliding column 22 loses the fixation of the limiting column 27 and can slide in the arc groove 21. With the first rotating gear 14 As the arc plate 12 continues to rotate, and after the sliding column 22 is unlocked by the unlocking component, the pushing column 16 will contact the sliding column 22 and drive the sliding column 22 to rotate in the arc groove 21. In this way, the first clamping plate 10 and the second clamping plate 11 on the sliding column 22 will also rotate from static to static. The first clamping plate 10 will slide on the outside of the muffler housing 3, and the second clamping plate 11 will rotate synchronously on the outside of the exhaust pipe 4. In this way, the plasma welding gun 15 can perform rotational welding on the connection between the muffler housing 3 and the exhaust pipe 4. During welding, the first clamping plate 10 and the second clamping plate 11 will simultaneously ensure the stability between the two welding parts, which can prevent the connection between the muffler housing 3 and the exhaust pipe 4 from being unable to be welded. At the same time, the third clamping plate 8 will always remain in the original position, further increasing the welding stability of the muffler housing 3 and the exhaust pipe 4.

[0060] After welding is completed, the arc plate 12 will separate from the unlocking block 24. Under the elastic force of the compression spring 26, the limiting post 27 of the unlocking block 24 will connect with the locking groove 28 in the sliding post 22. In this way, the sliding post 22 is fixed on the clamping frame 6 again. First, the movable plate 7 will move up under the operation of the power component. When the movable plate 7 moves up, it will cause the third clamping plate 8 to quickly separate from the exhaust pipe 4. After the movable plate 7 moves up to its original position, under the operation of the first motor 13, the two adjacent clamping frames 6 will start to separate. The first clamping plate 10 and the second clamping plate 11 will also lose their clamping on the muffler housing 3 and the exhaust pipe 4. The welded muffler housing 3 and the exhaust pipe 4 can be directly removed from the workbench 1.

[0061] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A plasma welding system for processing mufflers of agricultural machinery, comprising a worktable (1) and a vertical plate (2) fixedly mounted on the worktable (1), characterized in that: The workbench (1) is provided with a clamp (31), a clamping frame (6) and a plasma welding gun (15). The clamp (31) is provided with a muffler housing (3) and an exhaust pipe (4) on the muffler housing (3). The clamping frame (6) is provided with a clamping component. When two adjacent clamping frames (6) are close together, the clamping component will clamp and fix the muffler housing (3) and the exhaust pipe (4) to ensure that the clamping component can guarantee the stability between the two when the plasma welding gun (15) welds the connection between the muffler housing (3) and the exhaust pipe (4) and avoid the connection between the muffler housing (3) and the exhaust pipe (4) from tilting. The clamping assembly includes a first clamping plate (10) and a second clamping plate (11). The first clamping plate (10) clamps the upper half of the muffler housing (3), and the second clamping plate (11) clamps the lower half of the exhaust pipe (4). The first clamping plate (10) and the second clamping plate (11) together ensure the stability of the muffler housing (3) and the exhaust pipe (4) during welding. The clamping frame (6) is provided with an arc groove (21) and an unlocking component. A sliding post (22) is provided in the arc groove (21). The first clamping plate (10) and the second clamping plate (11) are both provided on the sliding post (22). The unlocking component is located on the side of the sliding post (22). The unlocking component includes a fixed frame (23), a fixed rod (25) is provided in the fixed frame (23), an unlocking block (24) and a compression spring (26) are provided on the outside of the fixed rod (25), a limit post (27) is provided on the side of the unlocking block (24), and a snap-fit ​​groove (28) matching the limit post (27) is provided on the sliding post (22). The upright plate (2) is provided with a movable plate (7), a partition plate (9) and a stabilizing component. A first rotating gear (14) is provided below the movable plate (7). The plasma welding gun (15) is fixedly connected to the first rotating gear (14). A push column (16) is provided below the first rotating gear (14). An arc plate (12) is provided below the push column (16). An inclined edge (20) is provided on the side of the arc plate (12). When the first rotating gear (14) rotates, it will drive the push column (16) to contact the sliding column (22), and through the arc plate (12) and the unlocking component, it will drive the sliding column (22) to rotate from static to moving in the arc groove (21), so that the plasma welding gun (15) can complete the welding of the muffler housing (3) and the exhaust pipe (4); The arc plate (12) is located above the unlocking block (24). When the arc plate (12) rotates around the central axis of the muffler housing (3), it will contact the unlocking block (24) through the inclined side (20) and passively press the unlocking block (24) through the inclined side (20), so that the unlocking block (24) moves down into the fixed frame (23), so that the limiting post (27) and the sliding post (22) are separated, so that the sliding post (22) can rotate in the clamping frame (6).

2. The plasma welding system for processing agricultural machinery mufflers according to claim 1, characterized in that: A second motor (17) and a rack column (18) are provided above the movable plate (7). A second rotating gear (19) is provided on the second motor (17). The first rotating gear (14) and the second rotating gear (19) are meshed and connected.

3. The plasma welding system for processing agricultural machinery mufflers according to claim 2, characterized in that: The stabilizing component includes a lead screw (29), and a third rotating gear (30) is provided at the end of the lead screw (29), which meshes with a rack column (18).

4. The plasma welding system for processing agricultural machinery mufflers according to claim 3, characterized in that: A third clamping plate (8) is provided on the outside of the lead screw (29). The third clamping plate (8) clamps the upper half of the exhaust pipe (4) to ensure the stability of the upper half of the exhaust pipe (4).

5. A plasma welding system for processing agricultural machinery mufflers according to claim 2, characterized in that: The partition (9) is located above the clamping assembly and below the movable plate (7), and a passage cavity is provided in the partition (9).

6. The plasma welding system for processing agricultural machinery mufflers according to claim 1, characterized in that: The workbench (1) is also provided with a movable column (5) and a first motor (13). The movable column (5) is fixedly connected to the clamping frame (6), and the movable column (5) is provided with a toothed column, which meshes with the gear on the first motor (13) through the toothed column.

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