A rotational moulding mould welding device and method

Abstract

The application relates to the technical field of welding devices, in particular to a rotational moulding mould welding device and a welding method. The device comprises a base and further comprises: a welding mechanism, which is installed on the base and is used for laser welding of a workpiece; a clamping mechanism, which is installed on the welding mechanism; and a cleaning mechanism, which is installed on the clamping mechanism and is used for cleaning along with rotation of the workpiece. The clamping mechanism comprises a movable plate, a driving assembly and a clamping assembly. The movable plate is installed on the driving end of the welding mechanism. The driving assembly is installed on the movable plate and is used for driving rotation of the clamping assembly. The clamping assembly is installed in the driving assembly and is used for fixed clamping of the workpiece. The welding mechanism drives the clamping assembly to contact and clamp the uneven surface of the workpiece to be welded. When the device is used for welding workpieces with different shapes, the workpiece is clamped from the middle part, so that the workpiece side shape is prevented from being bent, and the situation that the clamping stability is insufficient is avoided.

Description

Technical Field

[0001] This invention relates to the field of welding equipment technology, and specifically to a rotational molding die welding device and welding method. Background Technology

[0002] The rotational molding process involves adding a fixed amount of plastic powder to a mold, then rotating and heating the mold. Under the influence of gravity and heat, the powder melts evenly on the inner wall of the mold cavity, forming a uniform melt layer. The melt is then cooled and shaped before being demolded to obtain the desired hollow product. In some rotational molding processes, laser welding is required on the outer periphery of the mold, which necessitates the use of rotational molding welding equipment.

[0003] Chinese patent document CN219542011U discloses a laser mold welding machine, including a worktable, a welding assembly arranged above the worktable, and a protective mechanism on the top of the welding assembly. The protective mechanism includes a protective cover, a receiving cavity, a motor, a first threaded rod, a driving wheel, a belt, a driven wheel, a second threaded rod, and a threaded groove. The protective cover is located on the top of the worktable, and the receiving cavity is opened inside the worktable. A motor is arranged at the left end of the bottom wall of the receiving cavity. The first threaded rod is fixedly installed at the output shaft of the motor, and the driving wheel is fixedly installed on the outer surface of the first threaded rod. The outer surface of the driving wheel is connected to a belt for transmission. The above-mentioned prior art, by setting up a protective cover, allows the protective cover to move downward, forming a sealed space between the worktable and the protective cover, thereby protecting the welding assembly in the sealed space and preventing the welding assembly from being directly exposed to the outside and being bumped.

[0004] However, rotational molding is generally suitable for manufacturing larger products, so rotational molding molds are generally large. This makes it more difficult to move the rotational molding mold during welding. In addition, the inner cavity of the rotational molding mold is set into different shapes according to the product to be processed. Clamping the mold from the outside may not be able to hold the mold stably. Summary of the Invention

[0005] The purpose of this invention is to address the problems existing in the background art by proposing a welding device and welding method for rotational molding molds.

[0006] The technical solution of the present invention: a rotational molding die welding device, comprising a base, and further comprising: a welding mechanism mounted on the base and used for laser welding of workpieces; a clamping mechanism mounted on the welding mechanism; and a cleaning mechanism mounted on the clamping mechanism and used for cleaning as the workpiece rotates; the clamping mechanism comprises a movable plate, a driving assembly, and a clamping assembly; the movable plate is mounted on the driving end of the welding mechanism; the driving assembly is mounted on the movable plate and used to drive the rotation of the clamping assembly; the clamping assembly is mounted inside the driving assembly and used for fixing and clamping the workpiece; the welding mechanism drives the clamping assembly to contact and clamp the uneven surface of the workpiece to be welded.

[0007] Preferably, the clamping assembly includes a mounting ring, a rotating component, a spring, a lifting rod, a clamping head, and a fixing unit; the mounting ring is mounted on the movable plate; the rotating component is rotatably connected inside the mounting ring; the two ends of the spring are respectively connected to the top end of the rotating component and the lifting rod; the lifting rod passes through the rotating component and is connected to the clamping head; the fixing unit is installed inside the rotating component and is used to fix the lifting rod.

[0008] Preferably, the fixing unit includes a second drive unit and a clamping plate; the second drive unit is installed inside the rotating part; the clamping plate is installed on the movable end of the second drive unit; the clamping head clamps the uneven workpiece, changes the height of the lifting rod, and the second drive unit drives the clamping plate to fix the moved lifting rod.

[0009] Preferably, the drive assembly includes a second drive device, a gear, and a first gear ring; the second drive device is mounted on a movable plate; the gear is mounted on the output shaft of the second drive device; the first gear ring is mounted on the outside of the clamping assembly; the gear meshes with the first gear ring and is used to drive the clamping assembly to rotate.

[0010] Preferably, the cleaning mechanism includes an elastic element one, a snap-fit ​​rod, a pressing plate, an elastic element two, a movable element, a snap-fit ​​block, a blocking element, and an air blowing assembly; the two ends of the elastic element one are respectively connected to the middle of the movable plate and the snap-fit ​​rod; the pressing plate is mounted on the welding mechanism; the two ends of the elastic element two are respectively the movable element and the side of the movable plate; in the initial state, there is a gap between the movable element and the movable plate; the snap-fit ​​block is mounted on the bottom of the movable element; after the movable plate descends, the snap-fit ​​block snaps into the snap-fit ​​rod; the blocking element is mounted on the welding mechanism and is used to push the movable element.

[0011] Preferably, the air blowing assembly includes a rack, an air blowing cylinder, a second toothed ring, and an air conveying device; the rack is mounted on the movable part; the air blowing cylinder is rotatably connected to the bottom of the movable plate; the second toothed ring is mounted on the air blowing cylinder and meshes with the rack; the air conveying device is mounted on the welding mechanism and its output end is connected to the air blowing cylinder.

[0012] Preferably, the welding mechanism includes a laser welding assembly, a support plate, a first drive device, a C-shaped frame, a first drive unit, and a rotating device; the laser welding assembly is mounted on the base and used for welding the workpiece; the support plate is mounted on the base; the first drive device is mounted on the support plate and used to drive the C-shaped frame to rotate; the C-shaped frame is mounted on the output shaft of the first drive device; the first drive unit is mounted on the C-shaped frame; the movable plate and the rotating device are respectively connected to the two movable ends of the first drive unit.

[0013] This invention also provides a rotational molding die welding method, using the above-mentioned rotational molding die welding device, comprising the following specific steps: S1. Place the workpiece in the welding mechanism, then drive the clamping head to move towards the uneven surface of the workpiece. Subsequently, the clamping head fits against the surface of the workpiece, thereby driving multiple lifting rods to rise and fall to different heights. S2. Next, start the second drive unit to drive the clamping plate to apply pressure to the lifting rod, fix the height of the lifting rod, and then clamp and fix the workpieces of different shapes from the middle of the workpiece. S3. Subsequently, the welding mechanism drives the workpiece to rotate and performs welding. When the workpiece deflects, the cleaning mechanism cleans the internal debris of the workpiece according to the tilt direction of the workpiece.

[0014] Compared with the prior art, the above-mentioned technical solution of the present invention has the following beneficial technical effects: The workpiece is placed on the rotating equipment. If it is necessary to weld the outer shell and inner cavity of the mold together, there is no need to pre-tack weld the outer shell and inner cavity. Then, the drive unit one is started to drive the rotating equipment and the movable plate to move to the middle of the C-shaped frame. At this time, the clamping head contacts the uneven surface of the workpiece and drives multiple lifting rods to change their height. Then, the drive unit two is started to drive the clamping plate to fix the lifting rods after the height has changed, thereby clamping and fixing the workpiece to be welded. This realizes that when welding large rotational molding molds, there is no need to pre-tack weld between the outer shell and the inner cavity, which greatly reduces the production difficulty.

[0015] Furthermore, when welding workpieces of various shapes, clamping is performed from the middle of the workpiece to avoid bending of the side of the workpiece, which would result in insufficient clamping stability.

[0016] When the workpiece needs to be tilted for welding, the drive device 1 drives the C-shaped frame to rotate around the output shaft of the drive device 1. Depending on the direction of rotation, one of the moving parts comes into contact with one of the blocking parts. At this time, the blocking part briefly blocks the moving part, and the rotation of the C-shaped frame causes the entire moving part to be pulled by the blocking part, which in turn stretches the elastic part 2. The locking block at the bottom of the pulled moving part engages with the locking rod, thereby driving the rack to move and causing the air blower to tilt. As a result, when the workpiece is tilted, the air blower tilts towards the bottom of the workpiece, which allows the air blower to blow away and clean the debris on the surface of the workpiece, improving cleaning efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the C-shaped frame proposed in this invention; Figure 3 This is a schematic diagram of the structure of the movable component proposed in this invention; Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle; Figure 5 This is a schematic diagram of the support plate proposed in this invention; Figure 6 For the present invention Figure 5 Enlarged view of point B in the middle; Figure 7 This is a schematic diagram of the air blowing tube proposed in this invention; Reference numerals: 1. Base; 2. Laser welding assembly; 3. Support plate; 4. Drive device one; 5. C-shaped frame; 6. Drive unit one; 7. Movable plate; 8. Mounting ring; 9. Drive device two; 10. Gear; 11. Rotating component; 12. Gear ring one; 13. Spring one; 14. Lifting rod; 15. Clamping head; 16. Drive unit two; 17. Clamping plate; 18. Elastic component one; 19. Snap-fit ​​rod; 20. Pressing plate; 21. Elastic component two; 22. Movable component; 23. Snap-fit ​​block; 24. Blocking component; 25. Rack; 26. Air blower; 27. Gear ring two; 28. Air conveying device; 29. ​​Rotating device. Detailed Implementation

[0018] Example 1, as Figures 1-7As shown, the present invention proposes a rotational molding die welding device, including a base 1, and further including: a welding mechanism, which is mounted on the base 1 and used for laser welding of the workpiece; a clamping mechanism, which is mounted on the welding mechanism; and a cleaning mechanism, which is mounted on the clamping mechanism and used for cleaning as the workpiece rotates; the clamping mechanism includes a movable plate 7, a driving assembly, and a clamping assembly; the movable plate 7 is mounted on the driving end of the welding mechanism; the driving assembly is mounted on the movable plate 7 and used to drive the rotation of the clamping assembly; the clamping assembly is mounted inside the driving assembly and used for fixing and clamping the workpiece; the welding mechanism drives the clamping assembly to contact and clamp the uneven surface of the workpiece to be welded.

[0019] In existing technologies, when welding the inner cavity of a mold with a curved surface shape to the outer shell, the outer shell and the inner cavity of the mold are spot-welded together, and then a welding device is used for welding. However, since rotational molding molds are generally large, pre-spot welding is quite troublesome. Therefore, this device is used to clamp and fix the workpiece from the middle, thereby improving the stability and convenience of welding. When dealing with situations where the inner cavity and outer shell of the mold are not being machined, the parts are generally welded to the surface of the inner cavity of the mold to form the desired shape of the inner cavity. In this case, clamping from the middle of the mold avoids clamping the mold from the side, which can lead to unstable clamping.

[0020] The clamping assembly includes a mounting ring 8, a rotating component 11, a spring 13, a lifting rod 14, a clamping head 15, and a fixing unit. The mounting ring 8 is mounted on the movable plate 7. The rotating component 11 is rotatably connected within the mounting ring 8. The two ends of the spring 13 are respectively connected to the top end of the rotating component 11 and the lifting rod 14. The lifting rod 14 passes through the rotating component 11 and is connected to the clamping head 15. The fixing unit is installed within the rotating component 11 and is used to fix the lifting rod 14. Both drive unit 16 and drive unit 26 consist of a motor, a double-acting screw, and a guide rod. The double-acting screw is mounted on the output shaft of the motor, and the two guide rods are respectively mounted within the C-shaped frame 5 and the rotating component 11. The movable plate 7 and the rotating device 29 are threaded onto the double-acting screw of drive unit 16 and movably sleeved onto the guide rod of drive unit 16. The clamping plate 17 is threaded onto the double-acting screw of drive unit 26 and movably sleeved onto the guide rod of drive unit 26. Drive unit 16 and drive unit 26 can also be cylinders, etc.

[0021] The rotating device 29 can also be configured as a clamping mechanism; the side of the lifting rod 14 is provided with an anti-slip surface, and when the clamping plate 17 is driven, it fits against the anti-slip surface, thereby fixing the height of the lifting rod 14 and clamping and fixing the workpiece.

[0022] The fixing unit includes a second drive unit 16 and a clamping plate 17; the second drive unit 16 is installed inside the rotating part 11; the clamping plate 17 is installed on the movable end of the second drive unit 16; the clamping head 15 clamps the uneven workpiece, changes the height of the lifting rod 14, and the second drive unit 16 drives the clamping plate 17 to fix the moved lifting rod 14.

[0023] The drive assembly includes a second drive device 9, a gear 10, and a gear ring 12. The second drive device 9 is mounted on the movable plate 7. The gear 10 is mounted on the output shaft of the second drive device 9. The gear ring 12 is mounted on the outside of the clamping assembly. The gear 10 meshes with the gear ring 12 and is used to drive the clamping assembly to rotate. The second drive device 9 drives the gear 10 to rotate, and through the meshing of the gear 10 with the gear ring 12, it drives the gear ring 12 to rotate, thereby driving the rotating component 11 to rotate. The second drive device 9 drives the gear 10 to drive the rotating component 11 to rotate, and at the same time, the rotating device 29 rotates, thereby driving the workpiece to rotate about the center of the rotating component 11 as the axis.

[0024] Example 2, as Figures 1-3 and Figures 5-7 As shown, the rotational molding die welding device proposed in this invention, compared with Embodiment 1, has a cleaning mechanism including an elastic element 18, a snap-fit ​​rod 19, a pressing plate 20, an elastic element 21, a movable element 22, a snap-fit ​​block 23, a blocking element 24, and an air blowing assembly; the two ends of the elastic element 18 are respectively connected to the middle of the movable plate 7 and the snap-fit ​​rod 19; the pressing plate 20 is installed on the welding mechanism; the two ends of the elastic element 21 are respectively the movable element 22 and the side of the movable plate 7; in the initial state, the movable element 22 and the movable plate 7 have a gap, thereby allowing the movable element 22 to move in the future and preventing the movable element 22 from being blocked.

[0025] The snap-fit ​​block 23 is installed at the bottom of the movable part 22; after the movable plate 7 descends, the snap-fit ​​block 23 snaps into the snap-fit ​​rod 19; the blocking part 24 is installed on the welding mechanism and is used to push the movable part 22; the movable part 22 is provided with inclined blocks, there are two movable parts 22, and the heights of the inclined blocks on the two movable parts 22 are different; there are two blocking parts 24, the heights of the two blocking parts 24 are different, and they correspond to the inclined blocks on the two movable parts 22. When the driving device 4 drives the C-shaped frame 5 to rotate, it drives one of the movable parts 22 to contact one of the blocking parts 24. Because the heights of the inclined blocks are different, the movable part 22 will only contact one blocking part 24 during the rotation. When the movable part 22 comes into contact with one of the blocking parts 24, it is blocked by the blocking part 24. Due to the elasticity of the second elastic part 21, the movable part 22 will be pulled. At this time, because the locking block 23 and the locking rod 19 are engaged, the pulled movable part 22 is locked and fixed by the locking rod 19. The movable part 22 then drives the rack 25 to move. Through the meshing of the rack 25 and the second gear ring 27, the air blower 26 is driven to rotate in the tilting direction. For example, if the workpiece is tilted to the lower left, the air blower 26 is also tilted to the lower left. At this time, the air blown out by the air blower 26 can blow the dust and debris on the workpiece to the outside of the workpiece, thereby preventing dust and debris from being hidden on the uneven surface of the workpiece.

[0026] The air blowing assembly includes a rack 25, an air blowing cylinder 26, a second toothed ring 27, and an air conveying device 28. The rack 25 is mounted on the movable part 22. The air blowing cylinder 26 is rotatably connected to the bottom of the movable plate 7. The second toothed ring 27 is mounted on the air blowing cylinder 26 and meshes with the rack 25. The air conveying device 28 is mounted on the welding mechanism and its output end is connected to the air blowing cylinder 26. The air conveying device 28 is movably connected to the air blowing cylinder 26. The air conveying device 28 consists of an air pump and a telescopic hose. The air pump is mounted on the support plate 3, and the telescopic hose is mounted on the output end of the air pump, so that the gas generated by the air pump is blown out from the air blowing cylinder 26 along the telescopic hose.

[0027] The welding mechanism includes a laser welding assembly 2, a support plate 3, a drive device 4, a C-shaped frame 5, a drive unit 6, and a rotating device 29. The laser welding assembly 2 is mounted on the base 1 and is used for welding the workpiece. The support plate 3 is mounted on the base 1. The drive device 4 is mounted on the support plate 3 and is used to drive the C-shaped frame 5 to rotate. The C-shaped frame 5 is mounted on the output shaft of the drive device 4. The drive unit 6 is mounted on the C-shaped frame 5. The movable plate 7 and the rotating device 29 are respectively connected to the two movable ends of the drive unit 6. The rotating device 29 is an electric anti-slip plate that can cooperate with the gear 10 to drive the clamping head 15 to rotate, thereby driving the entire workpiece to rotate. Both the drive device 4 and the drive device 29 are motors.

[0028] Example 3, as Figures 1-7As shown, the rotational molding die welding method proposed in this invention, using the rotational molding die welding device described in Embodiment 1, includes the following specific steps: S1. Place the workpiece in the welding mechanism, then drive the clamping head 15 to move towards the uneven surface of the workpiece. Subsequently, the clamping head 15 fits against the surface of the workpiece, thereby driving multiple lifting rods 14 to rise and fall to different heights. S2. Next, drive unit 2 16 is started to drive clamping plate 17 to apply pressure to lifting rod 14, fix the height of lifting rod 14, and then clamp and fix workpieces of different shapes from the middle of the workpiece. S3. Subsequently, the welding mechanism drives the workpiece to rotate and performs welding. When the workpiece deflects, the cleaning mechanism cleans the internal debris of the workpiece according to the tilt direction of the workpiece.

[0029] In summary, in this application, the workpiece is placed on the rotating device 29, and then the drive unit 16 is activated to move the rotating device 29 and the clamping head 15 towards the center of the C-shaped frame 5, so that the clamping head 15 contacts and presses the curved surface of the workpiece. At this time, the movable part 22 moves to the appropriate position, and the blocking part 24 is located on the moving path of the movable part 22. At the same time, the locking rod 19 descends and separates from the pressing plate 20. The elasticity of the elastic part 18 causes the locking rod 19 to engage with the locking block 23. Then, the drive unit 26 is activated to drive the clamping plate 17 to contact the clamping head 15, thereby clamping and fixing the lifting rod 14, thus fixing the height of the lifting rod 14, so that the clamping head 15 can press and clamp the uneven surface of the workpiece, and fix the workpiece.

[0030] Next, by starting drive device 29, gear 10 and rotating device 29 are rotated, causing the workpiece to rotate. At the same time, laser welding assembly 2 moves to perform laser welding at the designated position. Then, drive device 14 is started to rotate C-shaped frame 5, causing the workpiece to tilt around the output shaft of drive device 14. Then, laser welding assembly 2 welds the tilted workpiece. When movable plate 7 tilts the workpiece, one of the movable parts 22 moves towards a blocking part 24. At this time, the blocking part 24 briefly blocks the movable part 22. Then, the elasticity of elastic part 21 causes the movable part 22 to be pulled. And through the locking rod 19 and locking block 23, the pulled movable part 22 is positioned. At this time, through the meshing of rack 25 and gear ring 27, the air blower 26 is tilted towards the lowest point of the workpiece. Then, the air supply device 28 is started to deliver gas to the air blower 26. Then, the air blower 26 blows the gas onto the workpiece to remove dust and debris.

[0031] After welding, the drive device 4 drives the C-shaped frame 5 to reset, the locking rod 19 contacts the pressing plate 20 and is pushed by the pressing plate 20, so that the elastic element 18 is stretched, thereby releasing the locking rod 19 from the locking block 23, and the movable part 22 is reset.

[0032] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A rotational molding die welding device, comprising a base (1), characterized in that, Also includes: A welding mechanism, which is mounted on a base (1) and is used for laser welding of workpieces; A clamping mechanism, which is mounted on the welding mechanism; A cleaning mechanism, which is mounted on a clamping mechanism, is used to clean the workpiece as it rotates; The clamping mechanism includes a movable plate (7), a drive assembly, and a clamping assembly; the movable plate (7) is mounted on the drive end of the welding mechanism; the drive assembly is mounted on the movable plate (7) and is used to drive the rotation of the clamping assembly; the clamping assembly is mounted inside the drive assembly and is used to fix and clamp the workpiece; the welding mechanism drives the clamping assembly to contact and clamp the uneven surface of the workpiece to be welded. The cleaning mechanism includes an elastic element 1 (18), a snap-fit ​​rod (19), a pressing plate (20), an elastic element 2 (21), a movable part (22), a snap-fit ​​block (23), a blocking element (24), and an air blowing assembly; the two ends of the elastic element 1 (18) are respectively connected to the middle of the movable plate (7) and the snap-fit ​​rod (19); the pressing plate (20) is mounted on the welding mechanism; the two ends of the elastic element 2 (21) are respectively connected to the movable part (22) and the side of the movable plate (7); in the initial state, there is a gap between the movable part (22) and the movable plate (7); the snap-fit ​​block (23) is mounted on the bottom of the movable part (22); after the movable plate (7) descends, the snap-fit ​​block (23) snaps into the snap-fit ​​rod (19); the blocking element (24) is mounted on the welding mechanism and is used to push the movable part (22); The air blowing assembly includes a rack (25), an air blowing cylinder (26), a second toothed ring (27), and an air conveying device (28); the rack (25) is mounted on the movable part (22); the air blowing cylinder (26) is rotatably connected to the bottom of the movable plate (7); the second toothed ring (27) is mounted on the air blowing cylinder (26) and meshes with the rack (25); the air conveying device (28) is mounted on the welding mechanism and its output end is connected to the air blowing cylinder (26).

2. The rotational molding die welding device according to claim 1, characterized in that, The clamping assembly includes a mounting ring (8), a rotating part (11), a spring (13), a lifting rod (14), a clamping head (15), and a fixing unit; the mounting ring (8) is mounted on the movable plate (7); the rotating part (11) is rotatably connected inside the mounting ring (8); the two ends of the spring (13) are respectively connected to the top end of the rotating part (11) and the lifting rod (14); the lifting rod (14) passes through the rotating part (11) and is connected to the clamping head (15); the fixing unit is installed inside the rotating part (11) and is used to fix the lifting rod (14).

3. The rotational molding die welding device according to claim 2, characterized in that, The fixing unit includes a second drive unit (16) and a clamping plate (17); the second drive unit (16) is installed inside the rotating part (11); the clamping plate (17) is installed on the movable end of the second drive unit (16); the clamping head (15) clamps the uneven workpiece, changes the height of the lifting rod (14), and the second drive unit (16) drives the clamping plate (17) to fix the moved lifting rod (14).

4. The rotational molding die welding device according to claim 1, characterized in that, The drive assembly includes a second drive device (9), a gear (10), and a first gear ring (12); the second drive device (9) is mounted on the movable plate (7); the gear (10) is mounted on the output shaft of the second drive device (9); the first gear ring (12) is mounted on the outside of the clamping assembly; the gear (10) meshes with the first gear ring (12) and is used to drive the clamping assembly to rotate.

5. The rotational molding die welding device according to claim 1, characterized in that, The welding mechanism includes a laser welding assembly (2), a support plate (3), a drive device (4), a C-shaped frame (5), a drive unit (6), and a rotating device (29); the laser welding assembly (2) is mounted on the base (1) and is used for welding the workpiece; the support plate (3) is mounted on the base (1); the drive device (4) is mounted on the support plate (3) and is used to drive the C-shaped frame (5) to rotate; the C-shaped frame (5) is mounted on the output shaft of the drive device (4); the drive unit (6) is mounted on the C-shaped frame (5); the movable plate (7) and the rotating device (29) are respectively connected to the two movable ends of the drive unit (6).

6. A method for welding rotational molding dies, using the rotational molding die welding apparatus described in claim 3, characterized in that, The specific steps include the following: S1. Place the workpiece in the welding mechanism, then drive the clamping head (15) to move towards the uneven surface of the workpiece. Then the clamping head (15) fits against the surface of the workpiece, thereby driving multiple lifting rods (14) to rise and fall to different heights. S2. Next, start the second drive unit (16) to drive the clamping plate (17) to apply pressure to the lifting rod (14) to fix the height of the lifting rod (14), and then clamp and fix the workpieces of different shapes from the middle of the workpiece. S3. Subsequently, the welding mechanism drives the workpiece to rotate and performs welding. When the workpiece deflects, the cleaning mechanism cleans the internal debris of the workpiece according to the tilt direction of the workpiece.

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