A hinge shaft welding machine and a hinge shaft welding method

Abstract

The application provides an upper hinge shaft welding machine and a welding method, which comprises a mounting frame, a tensioning unit, a pressing unit and a rotating unit. The tensioning unit comprises a main shaft, a top rod arranged in the main shaft and a plurality of tensioning blocks. The top rod is coaxially arranged with the main shaft. A plurality of conical support portions are arranged on the side wall of the top rod. The tensioning blocks are arranged in through holes and circumferentially attached to the outer periphery of the support portions. A first driving cylinder is arranged at the bottom of the main shaft. The tensioning blocks are radially moved to fix the shaft sleeve from the inside under the driving of the first driving cylinder. The pressing unit is symmetrically arranged on both sides of the main shaft in the mounting frame and comprises a second driving cylinder, a transmission assembly and a pressing claw. The second driving cylinder is extended and retracted to drive the transmission assembly to rotate the pressing claw and press the fixed stop sleeve. The rotating unit is arranged in the mounting frame and is in transmission connection with the main shaft to drive the axial rotation of the tensioning unit. The welding unit is arranged on one side of the mounting frame. The upper hinge shaft welding machine combines the current spot welding and axial welding into one step and realizes the automatic welding of the upper hinge shaft.

Description

Technical Field

[0001] This invention relates to the field of welding technology for front-mounted telescopic cylinders, and more particularly to an upper hinge shaft welding machine and an upper hinge shaft welding method. Background Technology

[0002] The front-mounted telescopic cylinder is a core component of the dump truck's hydraulic system. It typically employs a multi-stage nested cylinder design. A hinge shaft, which connects to the vehicle, is located at the bottom of the front-mounted telescopic cylinder. The FC front-mounted telescopic cylinder has two hinge shafts at the bottom: an upper hinge shaft and a lower hinge shaft. (See reference...) Figure 6 For the upper hinge shaft structure required for welding in this invention, the upper hinge shaft 62 is sleeved on the outer periphery of the bushing 61. The upper hinge shaft 62 is fixed by a limiting plate 65 integrally formed with the bushing 61 and a stop sleeve 64 welded to the outer periphery of the bushing. During vehicle operation, the upper hinge shaft 62 will vibrate and deflect due to the action of various forces. Therefore, a rubber ring 63 is provided at the upper hinge shaft 62. The rubber ring has compressibility and resilience to absorb and buffer these vibrations and deflections.

[0003] However, the rubber sleeve has a certain degree of elasticity, which can affect the welding process of the upper hinge shaft. Currently, the upper hinge shaft of the front cylinder liner is completed in two separate processes: spot welding and full weld. First, a counterweight box is used to press the hinge shaft, rubber ring, and stop sleeve together. The clearance is then measured with calipers to ensure it is appropriate. Then, spot welding is performed manually, and finally, a circumferential welder is used for full weld. Manual pressing results in poor uniformity of the fit clearance between the upper hinge shaft, rubber pad, and stop sleeve, often leading to defective products. This affects both subsequent welding and product quality. Summary of the Invention

[0004] To address the problems existing in the prior art, the first objective of this invention is to provide an upper hinge shaft welding machine, comprising:

[0005] Mounting bracket, including top panel and bottom panel;

[0006] The tensioning unit includes a main shaft rotatably connected in a mounting bracket. The main shaft is hollow and cylindrical. Multiple through holes are provided on the side wall of the main shaft. A push rod and multiple tensioning blocks are provided in the main shaft. The push rod is coaxially arranged with the main shaft. Multiple tapered support portions are provided on the side wall of the push rod. The tensioning blocks are disposed in the through holes and circumferentially fit against the outer periphery of the support portions. A first drive cylinder is provided at the bottom of the main shaft for driving the axial movement of the push rod. The tensioning blocks move radially under the drive of the first drive cylinder to fix the bushing from the inside.

[0007] The clamping unit is installed in the mounting bracket and symmetrically arranged on both sides of the main shaft. It includes a second drive cylinder, a transmission assembly, and a clamping claw. The extension and retraction of the second drive cylinder causes the transmission assembly to drive the clamping claw to rotate and press down to fix the stop sleeve.

[0008] A rotating unit is disposed in the mounting bracket and is connected to the main shaft drive to drive the tensioning unit to rotate axially.

[0009] A welding unit, located on one side of the mounting bracket, includes a welding torch and a moving assembly that allows the welding torch to approach or move away from the spindle.

[0010] Specifically, the second drive cylinder is a double piston rod hydraulic cylinder, which is located at the bottom of the upper panel. Piston rods are respectively provided at both ends of the second drive cylinder, and the cylinder walls at both ends of the second drive cylinder are respectively provided with a first oil port and a third oil port. The cylinder wall at the center of the second drive cylinder is provided with a second oil port.

[0011] Specifically, the transmission assembly includes racks disposed at both ends of the piston rod of the second drive cylinder, two fixed frames symmetrically disposed on both sides of the main shaft, and a gear set. The racks have their teeth facing upwards. A slot is provided in the mounting frame above the racks. A first gear is disposed in the slot and rotatably connected to the mounting frame via a first rotating shaft. The first gear meshes with the rack. Above the first gear is a second gear rotatably connected to one side of the fixed frame via a second rotating shaft. The second gear meshes with the first gear. A third gear is disposed in the second rotating shaft and coaxially disposed with the second gear. The third gear is located in the middle of the fixed frame. Above the third gear is a fourth gear rotatably connected to the fixed frame via a third rotating shaft. The fourth gear meshes with the third gear.

[0012] Specifically, a pressure plate is fixedly connected to the third rotating shaft, and pressure claws are provided on both sides of the pressure plate.

[0013] Specifically, a limit rod is provided on the rear side of the pressure claw.

[0014] Specifically, there are two support parts, located at the upper and lower ends of the tensioning block, respectively, and the tensioning block is provided with a guide slope that matches the slope of the support part.

[0015] Specifically, the rotating unit includes a drive module, a drive gear fixedly connected to the output end of the drive module, a driven gear fixedly connected to the main shaft, and a chain connecting the drive gear and the driven gear.

[0016] A second objective of this invention is to provide a method for welding an upper hinge shaft, comprising:

[0017] S1: Sequentially place the bushing onto the main shaft, and sequentially place the upper hinge shaft, rubber ring, and stop sleeve onto the bushing;

[0018] S2: Start the first drive cylinder and the second drive cylinder. The tensioning block tensions and fixes the bushing from the inside. The pressure claws press on the stop sleeve from both sides.

[0019] S3: The welding torch approaches the spindle for spot welding, then the welding torch retracts and the pressure plate is released;

[0020] S4: The rotary unit drives the spindle to rotate to multiple preset angles in sequence. After each rotation to the desired position, the pressure plate presses the stop sleeve, the welding gun approaches the spindle to perform spot welding, and then the welding gun retracts and the pressure plate is released.

[0021] S5: The rotary unit drives the spindle to rotate, the welding torch approaches the spindle to perform circumferential welding, and after welding is completed, the tension block is tightened and the workpiece is removed.

[0022] Specifically, step S4 also includes:

[0023] S4.1: After the rotary unit drives the spindle to rotate to 180° of the initial position, the pressure plate presses the stop sleeve, the welding gun approaches the spindle to perform spot welding, and then the welding gun retracts and the pressure plate is released;

[0024] S4.2: After the rotary unit drives the spindle to rotate to 90° of the initial position, the pressure plate presses the stop sleeve, the welding gun approaches the spindle to perform spot welding, and then the welding gun retracts and the pressure plate is released;

[0025] S4.3: After the rotary unit drives the spindle to rotate to the initial position of 270°, the pressure plate presses the stop sleeve, the welding gun approaches the spindle to perform spot welding, and then the welding gun retracts and the pressure plate is released.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0027] This invention designs an upper hinge shaft welding machine. Through a tensioning unit that clamps the bushing in one operation, a clamping unit automatically clamps the upper hinge shaft, rubber ring, and stop sleeve to ensure consistent clearance between them. A rotation unit automatically rotates the bushing, upper hinge shaft, rubber ring, and stop sleeve. A welding unit then performs spot welding. After spot welding, all clamping claws open for circumferential welding, combining spot welding and axial welding into one step, thus achieving automated welding of the upper hinge shaft. This upper hinge shaft welding machine improves the automation level of front-mounted telescopic cylinder welding, increases processing efficiency, shortens processing time, and makes welding quality more stable. Attached Figure Description

[0028] Figure 1 This is a schematic diagram illustrating the usage state of the present invention;

[0029] Figure 2 This is a cross-sectional assembly diagram of the tooling to be welded according to the present invention;

[0030] Figure 3 This is a schematic diagram of the first orientation structure of the present invention;

[0031] Figure 4 This is a schematic diagram of the second orientation structure of the present invention;

[0032] Figure 5 This is a cross-sectional view of the tensioning unit of the present invention;

[0033] Figure 6 This is a schematic diagram of the upper hinge shaft structure welded according to the present invention.

[0034] Reference numerals: 1. Mounting bracket; 11. Top panel; 12. Bottom panel; 13. Fixing bracket; 14. Limiting rod; 15. Slot; 16. First bearing; 17. Second bearing; 2. Tensioning unit; 21. Main shaft; 22. Push rod; 23. Tensioning block; 24. First drive cylinder; 25. Through hole; 26. Support part; 27. Guide slope; 3. Clamping unit; 31. Second drive cylinder; 311. First oil port; 312. Second oil port; 313. Third oil port; 32. Transmission assembly; 321. Rack; 322. First... 323. Rotating shaft; 324. Second rotating shaft; 325. Third rotating shaft; 326. First gear; 327. Second gear; 328. Third gear; 329. Limiting block; 33. Pressure claw; 331. Pressure plate; 34. First protective cover; 35. Second protective cover; 4. Rotating unit; 41. Drive module; 42. Drive gear; 43. Driven gear; 44. Chain; 5. Welding torch; 61. Bushing; 62. Upper hinge shaft; 63. Rubber ring; 64. Stop sleeve; 65. Limiting plate; 66. Welding point. Detailed Implementation

[0035] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0036] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] like Figures 1-5As shown, the upper hinge shaft welding machine of the present invention includes a mounting frame 1, in which a tensioning unit 2, a pressing unit 3 and a rotating unit 4 are provided. A welding unit is provided on one side of the mounting frame 1. The tensioning unit 2 and the pressing unit 3 are used to fix the bushing 61 and the stop sleeve 64 respectively, fixing the relative position of the bushing 61 and the stop sleeve 64. The rotating unit 4 drives the bushing 61 to rotate, and the bushing 61 and the stop sleeve 64 are welded together by the welding unit, thereby realizing the welding of the upper hinge shaft 62 of the front telescopic cylinder.

[0038] Mounting bracket 1 includes an upper panel 11 and a lower panel 12. Tensioning unit 2 is vertically installed in mounting bracket 1, pressing unit 3 is installed in the upper panel 11 of mounting bracket 1, and rotating unit 4 is installed in the lower panel 12 of mounting bracket 1.

[0039] The tensioning unit 2 includes a main shaft 21, a push rod 22, a tensioning block 23, and a first drive cylinder 24. A first bearing 16 and a second bearing 17 are coaxially arranged in the upper panel 11 and lower panel 12 of the mounting bracket 1, respectively. The main shaft 21 is installed in the bearings. The main shaft 21 has a hollow cylindrical structure, and multiple through holes 25 are opened at equal angles on the side wall at its upper end. The tensioning block 23 is disposed in the through holes 25. The through holes 25 have a certain thickness, guiding the tensioning block 23 to move radially along the through holes 25. A push rod 22 is provided at the center of the main shaft 21. The push rod 22 can move axially. Multiple tapered support portions 26 are provided on the side wall of the push rod 22 and at the through hole 25 of the main shaft 21. The tensioning block 23 contacts the support portions 26. Preferably, there are two support portions 26, located at the upper and lower ends of the tensioning block 23, respectively. The tensioning block 23 is provided with a guide slope 27 that matches the slope of the support portion 26. The guide slope 27 fits against the outer wall of the support portion 26. When the push rod 22 moves axially, the through hole 25 restricts the axial movement of the tensioning block 23. The guide slope 27 converts the vertical movement of the push rod 22 into radial movement outward, tightening and fixing the bushing 61 sleeved on the outer circumference of the main shaft 21. A first drive cylinder 24 is provided at the bottom end of the main shaft 21. The cylinder body of the first drive cylinder 24 is fixedly connected to the main shaft 21. The piston rod of the first drive cylinder 24 is set vertically upward and is connected to the push rod 22.

[0040] A bushing 61 is fitted around the outer circumference of the main shaft 21. The inner diameter of the bushing 61 is slightly larger than the radius of the main shaft 21. When the piston rod of the first drive cylinder 24 extends, the piston rod pushes the push rod 22 upward. The push rod 22 radially pushes the tensioning block 23 outward, tightening and fixing the bushing 61 fitted around the main shaft 21 from the inside. When the piston rod of the first drive cylinder 24 retracts, the push rod 22 moves downward and releases the thrust on the tensioning block 23, allowing the bushing 61 to be removed from the main shaft 21.

[0041] A rotating unit 4 is provided in the mounting frame 1. The rotating unit 4 includes a drive module 41, a drive gear 42 fixedly connected to the output end of the drive module 41, a driven gear 43 fixedly connected to the main shaft 21, and a chain 44 connecting the drive gear 42 and the driven gear 43. The drive module 41 is a stepper motor and a reducer, fixedly mounted on the lower panel 12 of the mounting frame 1. The output end of the drive unit passes through the lower panel 12 of the mounting frame 1. The drive gear, driven gear 43, and chain 44 are located at the bottom of the lower panel 12 of the mounting frame 1.

[0042] Driven by the drive module 41, the rotating unit 4 drives the main shaft 21 to rotate via the chain 44. The main shaft 21 drives the bushing 61, which is tensioned and fixed on the outer circumference of the main shaft 21, to rotate. When the welding torch 5 approaches, circumferential automatic welding can be achieved.

[0043] A clamping unit 3 is symmetrically arranged on both sides of the main shaft 21. The clamping unit 3 includes a second drive cylinder 31, a transmission assembly 32, and a clamping claw 33. The second drive cylinder 31 is a double piston rod hydraulic cylinder, which is fixedly installed at the bottom of the upper panel 11 of the mounting bracket 1. A piston rod that can retract or extend simultaneously is provided at both ends of the second drive cylinder 31. A first oil port 311 and a third oil port 313 are respectively provided on the cylinder wall at both ends of the second drive cylinder 31. A second oil port 312 is provided on the cylinder wall at the center of the second drive cylinder 31. When the piston rod of the second drive cylinder 31 needs to extend, the control valve controls the first oil port 311 and the third oil port 313 to discharge oil, and the second oil port 312 to receive oil. When the piston rod of the second drive cylinder 31 needs to retract, the control valve controls the second oil port 312 to discharge oil, and the first oil port 311 and the third oil port 313 to receive oil.

[0044] The transmission assembly 32 includes racks 321 disposed at both ends of the piston rod of the second drive cylinder 31, two fixed brackets 13 symmetrically disposed on both sides of the main shaft 21, and a gear set. Racks 321 are fixedly connected to both ends of the piston rod of the second drive cylinder 31, with the teeth of the racks 321 facing upwards. A limit block 329 is provided at the bottom of the upper panel 11 of the mounting bracket 1 to limit the extension and retraction of the racks 321. Fixed brackets 13 are symmetrically disposed on both sides of the main shaft 21, and the second drive cylinder 31 is disposed on one side of the fixed bracket 13. A slot 15 is provided above the racks 321, and a first gear 325 is rotatably connected to the mounting bracket 1 via a first rotating shaft 322 within the slot 15. The first gear 325 meshes with the racks 321. A second gear 326 is rotatably connected to one side of the fixed bracket 13 via a second rotating shaft 323 above the first gear 325, and the second gear 326 meshes with the first gear 325. A third gear 327, coaxially arranged with the second gear 326, is located in the middle of the fixed frame 13 within the second rotating shaft 323. Above the third gear 327, a fourth gear 328 is rotatably connected to the fixed frame 13 via the third rotating shaft 324, and meshes with the third gear 327. A pressure plate 331 is fixedly connected to the third rotating shaft 324, with pressure claws 33 on both sides. Rotating the pressure plate 331 causes the pressure claws 33 to press against the stop sleeve 64, thus fixing the stop sleeve 64. A limit rod 14 is provided on the rear side of the pressure claws 33 to limit the rotation angle of the pressure claws 33, ensuring that both pressure claws 33 rotate from a fixed point. A first protective cover 34 is provided on the outside of the first gear 325 and the second gear 326, and a second protective cover 35 is provided on the outside of the third gear 327 and the fourth gear 328 to prevent foreign objects from being drawn in during the rotation of the gears.

[0045] When the piston rod of the second drive cylinder 31 extends, the rack 321 drives the first gear 325 to rotate, the first gear 325 drives the second gear 326 to rotate, the second gear 326 drives the second rotating shaft 323 to rotate, causing the third gear 327 to drive the fourth gear 328 to rotate, and the fourth gear 328 drives the third rotating shaft 324 to rotate, causing the pressure claws 33 on the pressure plate 331 to press against the stop sleeve 64, thus tightening the stop sleeve 64. After the piston rod of the second drive cylinder 31 retracts, the transmission assembly 32 moves in the reverse direction, causing the pressure claws 33 pressing against the stop sleeve 64 to rotate to both sides, releasing the pressure on the stop sleeve 64. By automatically tightening the stop sleeve 64 with the pressure claws 33, the gap between the upper hinge shaft 62, the rubber ring 63, and the stop sleeve 64 is kept uniform.

[0046] The welding unit is set on one side of the mounting frame 1 and includes a welding torch 5 and a moving component. The moving component can be a robotic arm, a servo motor and slide rail, or a cylinder to move the welding torch 5, so that the welding torch 5 is close to the spindle 21 during welding and away from the spindle 21 after welding is completed.

[0047] The welding process of this upper hinge shaft welding machine is as follows:

[0048] S1: Sequentially place the bushing 61 onto the main shaft 21, and sequentially place the upper hinge shaft 62, rubber ring 63 and stop sleeve 64 onto the bushing 61;

[0049] S2: Start the first drive cylinder 24 and the second drive cylinder 31. The tensioning block 23 tensions and fixes the bushing 61 from the inside. The pressure claws 33 press on the stop sleeve 64 from both sides.

[0050] S3: The welding torch 5 approaches the spindle 21 to perform spot welding, and then the welding torch 5 retracts and the pressure claw 33 is released;

[0051] S4: The rotating unit 4 drives the spindle 21 to rotate to multiple preset angles in sequence. After each rotation is completed, the pressure claw 33 presses the stop sleeve 64, the welding gun 5 approaches the spindle 21 to perform spot welding, and then the welding gun 5 retracts and releases the pressure claw 33.

[0052] S4.1: After the rotating unit 4 drives the spindle 21 to rotate to the initial position of 180°, the pressure claw 33 presses the stop sleeve 64, the welding gun 5 approaches the spindle 21 to perform spot welding, and then the welding gun 5 retracts and releases the pressure claw 33.

[0053] S4.2: After the rotating unit 4 drives the spindle 21 to rotate to 90° of the initial position, the pressure claw 33 presses the stop sleeve 64, the welding gun 5 approaches the spindle 21 to perform spot welding, and then the welding gun 5 retracts and releases the pressure claw 33.

[0054] S4.3: After the rotating unit 4 drives the main shaft 21 to rotate to the initial position of 270°, the pressure claw 33 presses the stop sleeve 64, the welding gun 5 approaches the main shaft 21 to perform spot welding, and then the welding gun 5 retracts and releases the pressure claw 33.

[0055] S5: Rotary unit 4 drives spindle 21 to rotate, welding torch 5 approaches spindle 21 to perform circumferential welding, after welding is completed, tension block 23 is tightened and workpiece is removed.

[0056] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A top-hinged axle welding machine characterized in that, include: Mounting bracket (1) includes a top panel (11) and a bottom panel (12). The tensioning unit (2) includes a main shaft (21) rotatably connected in the mounting bracket (1). The main shaft (21) is hollow cylindrical. The side wall of the main shaft (21) is provided with multiple through holes (25). The main shaft (21) is provided with a push rod (22) and multiple tensioning blocks (23). The push rod (22) is coaxially arranged with the main shaft (21). The side wall of the push rod (22) is provided with multiple tapered support parts (26). The tensioning blocks (23) are arranged in the through holes (25) and circumferentially fit against the outer periphery of the support parts (26). The bottom of the main shaft (21) is provided with a first drive cylinder (24) for driving the push rod (22) to move axially. The tensioning blocks (23) move radially under the drive of the first drive cylinder (24) to fix the bushing (61) from the inside. The clamping unit (3) is set in the mounting bracket (1) and symmetrically arranged on both sides of the main shaft (21). It includes a second drive cylinder (31), a transmission assembly (32) and a clamping claw (33). The second drive cylinder (31) extends and retracts, causing the transmission assembly (32) to drive the clamping claw (33) to rotate and press down to fix the stop sleeve (64). The second drive cylinder (31) is a double piston rod hydraulic cylinder. The transmission assembly (32) includes a rack (321) disposed at both ends of the piston rod of the second drive cylinder (31), two fixed brackets (13) symmetrically disposed on both sides of the main shaft (21), and a gear set. The rack (321) is arranged with its teeth facing upward. A slot (15) is provided in the mounting bracket (1) above the rack (321). A first gear (325) is disposed in the slot (15) and rotatably connected to the mounting bracket (1) through a first rotating shaft (322). The first gear (325) meshes with the rack (321). The upper part of the first gear (325) is... A second gear (326) is rotatably connected to one side of the fixed frame (13) via a second rotating shaft (323). The second gear (326) meshes with the first gear (325). A third gear (327) is coaxially arranged in the second rotating shaft (323) and is located in the middle of the fixed frame (13). Above the third gear (327) is a fourth gear (328) rotatably connected to the fixed frame (13) via a third rotating shaft (324). The fourth gear (328) meshes with the third gear (327). Rotating unit (4), the rotating unit (4) is disposed in the mounting frame (1) and is connected to the main shaft (21) for transmission, driving the tensioning unit (2) to rotate axially; The welding unit, located on one side of the mounting bracket (1), includes a welding torch (5) and a moving assembly that moves the welding torch (5) closer to or further away from the spindle (21).

2. The upper hinge shaft welding machine according to claim 1, characterized in that, The second driving cylinder (31) is arranged at the bottom of the upper panel (11), both ends of the second driving cylinder (31) are respectively provided with a piston rod, the cylinder wall of both ends of the second driving cylinder (31) is respectively provided with a first oil port (311) and a third oil port (313), and the cylinder wall of the center of the second driving cylinder (31) is provided with a second oil port (312).

3. The upper hinge shaft welding machine according to claim 1, characterized in that, The third rotating shaft (324) is fixedly connected with a pressing plate (331), and both sides of the pressing plate (331) are provided with pressing claws (33).

4. The upper hinge shaft welding machine of claim 1, wherein, The rear side of the pressing claw (33) is provided with a limiting rod (14).

5. The upper hinge shaft welding machine of claim 1, wherein, The support portions (26) are two and are respectively located at the upper end and the lower end of the tensioning block (23), and the tensioning block (23) is provided with a guide inclined surface (27) matched with the slope of the support portion (26).

6. The upper hinge shaft welding machine of claim 1, wherein, The rotating unit (4) comprises a driving module (41), a driving gear (42) fixedly connected to the output end of the driving module (41), a driven gear (43) fixedly connected in the main shaft (21) and a chain (44) connecting the driving gear (42) and the driven gear (43).

7. A method of welding a top hinge axis using a top hinge axis welding machine according to any one of claims 1 to 6, characterized in that, Comprise: S1: sequentially sleeve the shaft sleeve (61) on the main shaft (21), sequentially sleeve the upper hinge shaft (62), the rubber ring (63) and the stop sleeve (64) on the shaft sleeve (61); S2: start the first driving cylinder (24) and the second driving cylinder (31), the tensioning block (23) is tensioned from the inner side of the shaft sleeve (61) and fixes the shaft sleeve (61), and the pressing claw (33) is pressed on the stop sleeve (64) from both sides; S3: the welding gun (5) approaches the main shaft (21) for spot welding, then the welding gun (5) retreats, and the pressing claw (33) is loosened; S4: the rotating unit (4) drives the main shaft (21) to rotate to a plurality of preset angles in sequence, and the pressing claw (33) presses the stop sleeve (64) tightly after each rotation, the welding gun (5) approaches the main shaft (21) for spot welding, then the welding gun (5) retreats, and the pressing claw (33) is loosened; S5: the rotating unit (4) drives the main shaft (21) to rotate, the welding gun (5) approaches the main shaft (21) for circumferential welding, and the tensioning block (23) is tightened after the welding is completed, and the workpiece is taken down.

8. The method of welding a top hinged axle as defined in claim 7, wherein, In step S4, further comprising: S4.1: the rotating unit (4) drives the main shaft (21) to rotate to 180° of the initial position, the pressing claw (33) presses the stop sleeve (64) tightly, the welding gun (5) approaches the main shaft (21) for spot welding, then the welding gun (5) retreats, and the pressing claw (33) is loosened; S4.2: the rotating unit (4) drives the main shaft (21) to rotate to 90° of the initial position, the pressing claw (33) presses the stop sleeve (64) tightly, the welding gun (5) approaches the main shaft (21) for spot welding, then the welding gun (5) retreats, and the pressing claw (33) is loosened; S4.3: the rotating unit (4) drives the main shaft (21) to rotate to 270° of the initial position, the pressing claw (33) presses the stop sleeve (64) tightly, the welding gun (5) approaches the main shaft (21) for spot welding, then the welding gun (5) retreats, and the pressing claw (33) is loosened.

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