A thrust bearing welding fixture

Abstract

The present application relates to the technical field of welding. The purpose is to provide a thrust bearing welding tool, which comprises a centering shaft, a telescopic inner support mechanism, a rotary welding mechanism and a constant force driving mechanism are arranged on the centering shaft; the telescopic inner support mechanism can be opened and supported on the inner wall of the workpiece and the base, so that the centering shaft is fixed on the shaft center of the workpiece and the base; the rotary welding mechanism is used for carrying a welding gun and can drive the welding gun to rotate around the centering shaft at a constant speed under the driving of the constant force driving mechanism; the rotary welding mechanism comprises a liquid damping box fixedly arranged outside the upper section of the centering shaft and a plurality of telescopic load arms uniformly distributed around the liquid damping box. The present application significantly improves the assembly precision and welding quality of the on-site girth welding of the super-large air-suspended thrust bearing, breaks away from the dependence on external energy, truly realizes the symmetrical uniform speed welding of multiple welding guns, and fundamentally solves the technical contradiction that the traditional process cannot simultaneously consider the on-site adaptability, rotary stability and low stress welding.

Description

Technical Field

[0001] This invention relates to the field of welding technology, and specifically to a thrust bearing welding fixture. Background Technology

[0002] In the on-site assembly of ultra-large air-suspended thrust bearings, the circumferential welding of the bearing back plate (seat ring) to the machine body is a critical process to ensure the bearing's rigidity, flatness, and operational stability. Since the bearing diameter can reach 1 meter, traditional manual single-gun continuous welding results in concentrated heat input and uneven weld cooling, easily leading to circumferential asymmetric thermal deformation and residual stress in the back plate. This directly damages the bearing end face flatness and air film clearance, severely affecting the bearing's operational accuracy and lifespan. To achieve low-deformation, low-stress welding, the industry commonly employs a multi-gun symmetrical synchronous rotary welding process. By having evenly distributed welding guns rotate synchronously around the axis, the weld is heated symmetrically, and stresses cancel each other out, fundamentally suppressing welding deformation.

[0003] However, the core prerequisite for achieving symmetrical synchronous welding with multiple welding torches is that the rotary mechanism must move at a stable and uniform angular velocity. Even slight fluctuations in welding speed will directly lead to uneven weld penetration and inconsistent heat input, thus negating the stress-relieving benefits of symmetrical welding.

[0004] The existing rotary welding equipment mainly suffers from the following technical defects:

[0005] 1. Electric / hydraulic drives rely on external energy and control systems, making them poorly adaptable to complex field environments such as outdoor, high-altitude, explosion-proof, and power-free environments. They are also susceptible to fluctuations in voltage, load, and oil temperature, making it difficult to guarantee a strictly constant rotation speed.

[0006] 2. Conventional purely mechanical mechanisms cannot provide stable driving torque: If ordinary torsion springs, coil springs and other elastic elements are used, their output torque will change significantly with the torsion angle, resulting in a rotation speed that is fast at the beginning and slow at the end or slow at the beginning and fast at the end, which cannot meet the requirements of uniform speed welding.

[0007] Therefore, in order to meet the requirements of multi-gun symmetrical, low-stress, and uniform-speed rotary welding of ultra-large air-floating thrust bearings, the development of a rotary welding device that does not rely on electricity, relies entirely on a purely mechanical structure, and can provide a constant driving torque has become a key technical problem that urgently needs to be solved in the field of large air-floating equipment assembly. Summary of the Invention

[0008] The purpose of this invention is to provide a thrust bearing welding fixture with a compact and sophisticated structure that can ensure the quality of rotary welding.

[0009] To achieve the above-mentioned objectives, the technical solution adopted by this invention is: a thrust bearing welding fixture, comprising a centering shaft, on which a telescopic inner support mechanism, a rotary welding mechanism, and a constant force drive mechanism are provided; the telescopic inner support mechanism can open and support itself on the inner wall of the workpiece and the foundation, so that the centering shaft is fixed at the axis of the workpiece and the foundation; the rotary welding mechanism is used to carry a welding torch and can drive the welding torch to rotate around the centering shaft at a constant speed under the drive of the constant force drive mechanism, so that an annular weld can be formed between the workpiece and the mounting foundation on the rotation path of the welding torch;

[0010] The rotary welding mechanism includes a liquid damping box fixedly installed outside the upper section of the centering shaft and several telescopic arms evenly distributed around the liquid damping box in a circumferential direction; one end of each telescopic arm is connected to the liquid damping box, and the other end is equipped with a welding torch.

[0011] The liquid damping box includes an I-shaped fixed disk fixedly mounted on a centering shaft, and a hollow cylindrical rotating box sleeved outside the fixed disk; both ends of the rotating box are sleeved outside the centering shaft and rotate in conjunction with the centering shaft, and the inner end of the telescopic arm is connected to the outer wall of the rotating box; the two end faces of the rotating box abut against the two disk surfaces of the fixed disk, so that the circumference of the rotating box and the two disk surfaces of the fixed disk together form a liquid storage space filled with damping fluid; the vertical rod of the fixed disk is provided with a fixed partition extending radially along the fixed disk, and the inner circumference of the rotating box is provided with a movable partition extending radially along the rotating box; the movable partition and the fixed partition divide the liquid storage space into a first chamber and a second chamber that are independent of each other, and the movable partition is provided with a throttling orifice.

[0012] Preferably, the cross-sectional dimensions of the throttling orifice are fixed.

[0013] Preferably, the cross-sectional dimensions of the throttling orifice can be adjusted.

[0014] Preferably, the moving partition has a slot inside, the inner end of the slot extends to intersect with the throttling orifice, and the outer end extends to the outer wall of the rotating box; an adjusting slab is provided in the slot, and the adjusting slab has a teardrop-shaped through hole. By changing the length of the adjusting slab inserted into the slot, the overlap area between the through hole and the throttling orifice is adjusted, thereby adjusting the flow cross-sectional size of the throttling orifice.

[0015] Preferably, the constant pressure drive mechanism includes a counterweight, a reversing frame, and a deceleration assembly disposed above the liquid damping box;

[0016] The deceleration assembly includes an L-shaped crank plate mounted on a centering shaft. The middle of the horizontal section of the crank plate is sleeved on and fixedly connected to the centering shaft. A through groove extending along the length of the vertical section of the crank plate is provided, and a drive rack that slides within the through groove is provided. A reduction gear is also mounted on the horizontal section of the crank plate. One side of the reduction gear extends through a through hole in the vertical section of the crank plate into the through groove and meshes with the drive rack. A drive neck extends upward from the center of the upper end face of the rotating box. The drive neck is sleeved on the centering shaft, and a drive gear ring is provided on the circumference of the drive neck. The axle of the reduction gear extends downward to one side of the drive gear ring and meshes with the drive gear ring through key teeth on the axle.

[0017] The counterweight is connected to the drive rack via a cable that bypasses the commutator.

[0018] Preferably, the top of the drive rack is also provided with a locking hole, and the top of the vertical section of the crank plate is provided with a pin hole and a pin rod that cooperate with the locking hole. The drive rack is locked in the initial position by inserting the pin rod into the pin hole and the locking hole. A limiting boss is provided at the end of the drive rack away from the locking hole, and the limiting boss abuts against the end of the through groove to form a locking in the extreme position.

[0019] Preferably, the reversing frame includes a Y-shaped frame and guide wheels mounted on the frame, with the pull cable passing around the guide wheels to form a guide.

[0020] Preferably, a sealing ring is provided between the plate body of the fixed plate and the end face of the rotating box.

[0021] Preferably, the telescopic boom includes a main boom and a secondary boom, the secondary boom being inserted into the main boom and locked by a boom length locking bolt;

[0022] The bottom of the main arm is provided with a strip-shaped hole extending along the length of the main arm. A fixing head is provided below the liquid damping box, and multiple diagonal braces are provided at the fixing head corresponding to the number of telescopic arms. One end of the diagonal brace is hinged to the fixing head, and the other end is bent and locked in the strip-shaped hole, and locked by an angle locking bolt.

[0023] The end of the auxiliary arm is hinged to a mounting plate, and the angle of the mounting plate is locked by a mounting plate locking bolt.

[0024] A welding torch is mounted on the carrier plate.

[0025] Preferably, the lower end of the centering shaft is provided with a mounting base, and the telescopic inner support mechanism includes multiple sets of support claws and drive components provided at the mounting base;

[0026] The support claw includes a pair of claw rods and a claw plate. The two ends of the claw rods are respectively hinged to the mounting base and the claw plate to form a parallelogram structure.

[0027] The drive assembly includes a drive rod, an adjusting sleeve that is sleeved on the centering shaft and has a threaded engagement with the centering shaft, a rotating ring that has a rotatable engagement with the adjusting sleeve, one end of the drive rod being hinged to the rotating ring, and the other end being hinged to the claw plate.

[0028] The beneficial effects of this invention are mainly reflected in the following: by integrating centering, constant speed rotation and liquid damping speed limiting into a single structural design, the assembly accuracy and welding quality of on-site circumferential welding of ultra-large air-suspended thrust bearings are significantly improved. While eliminating dependence on external energy, it truly achieves symmetrical and uniform speed welding with multiple welding guns, fundamentally solving the technical contradiction that traditional processes cannot balance on-site adaptability, rotational stability and low welding stress.

[0029] This fixture uses a centering shaft and a telescopic inner support mechanism as a unified reference, enabling rapid rigid centering and positioning at the bearing back plate and the mounting axis of the machine body. This ensures that the rotation axis of the welding torch is highly aligned with the axis of the workpiece's circumferential weld, preventing weld uniformity from being compromised by clamping eccentricity or secondary positioning deviations. This provides a stable and reliable precision foundation for symmetrical welding and reduced deformation. Its core liquid damping box uses a fixed disc and a rotating box to form a closed liquid storage space, which is divided into an independent first chamber and a second chamber by a fixed partition and a moving partition. During rotation, the damping fluid can only flow between the two chambers through throttling orifices on the moving partition. The purely mechanical throttling action forcibly stabilizes the rotational angular velocity, keeping the welding speed continuous and uniform. This effectively avoids problems such as uneven heat input, excessive weld penetration differences, and symmetrical welding failure caused by speed fluctuations. Compared to electric and hydraulic drive methods, this solution is completely independent of external energy, control systems, and complex transmission components. It can operate stably in harsh conditions such as outdoor, high-altitude, explosion-proof, and power-free environments, significantly improving environmental adaptability and reliability. Meanwhile, this liquid damping speed-limiting structure can maintain a nearly constant flow rate and speed even when the driving torque fluctuates slightly. In principle, it overcomes the speed instability caused by torque variations with stroke in conventional elastic drive elements. Combined with multiple circumferentially distributed telescopic arms, it can stably achieve synchronous symmetrical welding with multiple welding guns, ensuring uniform circumferential heating of the bearing back plate and mutual cancellation of welding stresses. This significantly reduces welding deformation and residual stress, ensuring the flatness of the back plate end face and the accuracy of the air film clearance, ultimately improving the assembly quality and service life of the ultra-large air-bearing thrust bearing. The overall tooling structure is compact and highly integrated, sharing the same reference for centering and welding processes. It is easy to operate, efficient in assembly and disassembly, and possesses strong process adaptability and field practicality. Attached Figure Description

[0030] Figure 1This is a schematic diagram of the structure of the present invention;

[0031] Figure 2 for Figure 1 Enlarged view of section A in the middle;

[0032] Figure 3 for Figure 2 BB view of the structure shown;

[0033] Figure 4 for Figure 3 The CC view of the structure shown;

[0034] Figure 5 This is a schematic diagram of the commutator structure;

[0035] Figure 6 This is a schematic diagram of the structure of the present invention in one usage state;

[0036] Figure label:

[0037] 1. Centering shaft; 2. Telescopic inner support mechanism; 3. Rotary welding mechanism; 4. Constant force drive mechanism; 5. Welding torch; 6. Liquid damping box; 7. Telescopic boom; 8. Fixed plate; 9. Rotary box; 10. Liquid storage space; 11. Fixed partition; 12. Moving partition; 13. First chamber; 14. Second chamber; 15. Throttling orifice; 16. Slot; 17. Adjusting insert; 18. Through hole; 19. Counterweight; 20. Reversing frame; 21. Reduction assembly; 22. Crank plate; 23. Through slot; 24. Drive rack; 25. Reduction gear; 26. Drive neck; 27. Drive gear. 28. Ring, 29. Pull wire, 30. Locking hole, 31. Pin hole, 32. Pin rod, 33. Limiting boss, 34. Frame, 35. Guide wheel, 36. Sealing ring, 37. Main arm, 38. Secondary arm, 39. Arm length locking bolt, 40. Strip hole, 41. Fixing head, 42. Diagonal brace, 43. Angle locking bolt, 44. Mounting plate, 45. Mounting seat, 46. Support claw, 47. Drive assembly, 48. Claw rod, 49. Claw plate, 50. Drive rod, 51. Adjusting sleeve, 52. Rotating ring; 0a. Bearing back plate; 0b. Bearing seat. Detailed Implementation

[0038] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are for explanation and illustration only and are not intended to limit the scope of the invention.

[0039] like Figures 1 to 6As shown, a thrust bearing welding fixture is mainly applicable to on-site circumferential weld operations between the back plate of an ultra-large air-suspended thrust bearing and the machine body. The fixture includes a centering shaft 1, on which, from bottom to top, are sequentially arranged a telescopic inner support mechanism 2, a rotary welding mechanism 3, and a constant force drive mechanism 4. The telescopic inner support mechanism 2 is used to quickly fix the entire fixture at the center position of the workpiece and foundation, ensuring that the centering shaft 1 coincides with the rotation axis of the bearing and the machine body. The rotary welding mechanism 3 is used to mount the welding torch 5 and achieve uniform rotation. The constant force drive mechanism 4 provides a stable and uniform driving force to the rotary welding mechanism 3, ensuring that the welding torch 5 maintains a constant angular velocity during welding, thereby ensuring consistent weld penetration and uniform heat input in the circumferential weld.

[0040] The telescopic inner support mechanism 2 is located at the lower end of the centering shaft 1, and a mounting base 45 is fixedly installed at the bottom end of the centering shaft 1. The telescopic inner support mechanism 2 includes multiple sets of support claws 46 evenly arranged around the mounting base 45 and a drive assembly 47. Each set of support claws 46 consists of a pair of claw rods 48 and a claw plate 49. The two claw rods 48 are parallel to each other, with one end hinged to the mounting base 45 and the other end hinged to the claw plate 49, forming a parallelogram support structure. During telescopic movement, the claw plate 49 can always be kept in contact with the inner wall, ensuring stable and reliable support. The drive assembly 47 includes a drive rod 50, an adjusting sleeve 51, and a rotating ring 52. The adjusting sleeve 51 is sleeved outside the centering shaft 1 and forms a threaded engagement with the centering shaft 1. The rotating ring 52 is sleeved outside the adjusting sleeve 51 and forms a rotational engagement with the adjusting sleeve 51. One end of the drive rod 50 is hinged to the rotating ring 52, and the other end is hinged to the claw plate 49. In use, the operator rotates the adjusting sleeve 51, which moves axially along the centering shaft 1. This moves the drive rod 50 via the rotating ring 52, thereby pushing the claw plate 49 outward until it presses against the workpiece. Figure 6 (middle bearing back plate 0a) and mounting foundation ( Figure 6 On the inner wall of the bearing housing 0b on the machine frame, the centering shaft 1 is quickly and firmly positioned on the central axis of the workpiece, achieving rapid centering and fixing of the tooling. For example... Figure 6 As shown in the text, although the workpiece generally refers to the bearing back plate 0a and the mounting base is the bearing seat 0b, in some application environments, the mounting base can also be other annular mounting bases, such as the frame of equipment, the end of a pipe, etc.

[0041] The rotary welding mechanism 3 includes a liquid damping box 6 fixedly mounted on the outer side of the upper section of the centering shaft 1, and multiple telescopic arms 7 evenly distributed circumferentially around the liquid damping box 6. The inner end of the telescopic arms 7 is connected to the liquid damping box 6, and the outer end is equipped with a welding torch 5. The radial position and angle of the welding torch 5 can be adjusted according to the bearing diameter to adapt to the welding requirements of ultra-large thrust bearings of different specifications.

[0042] The liquid damping box 6 is the core component for achieving constant-speed rotation. It includes an I-shaped fixed disk 8 fixedly mounted on a centering shaft 1, and a hollow cylindrical rotating box 9 sleeved on the outside of the fixed disk 8. Both ends of the rotating box 9 are sleeved on the centering shaft 1 and form a rotational engagement with the centering shaft 1, allowing the rotating box 9 to rotate freely around the centering shaft 1. The two end faces of the rotating box 9 respectively abut against the outer sides of the upper and lower disks of the fixed disk 8. The circumferential inner wall of the rotating box 9 and the two disks of the fixed disk 8 together form a closed liquid storage space 10, which is filled with damping fluid. To ensure a sealing effect, a sealing ring 35 is provided between the disk body of the fixed disk 8 and the end faces of the rotating box 9 to prevent damping fluid leakage and ensure stable damping effect.

[0043] A fixed partition 11 extending radially is provided on the vertical rod of the fixed disk 8, and a movable partition 12 extending radially is provided on the inner circumferential surface of the rotating box 9. The fixed partition 11 and the movable partition 12 together divide the liquid storage space 10 into two independent chambers, a first chamber 13 and a second chamber 14. A throttling orifice 15 is provided on the movable partition 12. When the rotating box 9 rotates around the fixed disk 8, the movable partition 12 rotates accordingly, causing the volume of the first chamber 13 and the second chamber 14 to change alternately. The damping fluid can only flow slowly between the two chambers through the throttling orifice 15. The rotation speed is limited by the throttling resistance of the liquid, so that the rotation of the rotating box 9 remains stable and uniform, avoiding sudden changes in rotation speed that may affect the welding quality.

[0044] In a simple implementation, the throttling orifice 15 adopts a structure with a fixed flow cross-sectional size. The rotational angular velocity is determined by the preset orifice diameter. The structure is simple, easy to process, and reliable in operation, and it is suitable for batch welding operations of bearings of a single specification.

[0045] In another preferred embodiment, the flow cross-sectional size of the throttling orifice 15 is adjustable to adapt to different welding process speed requirements. Specifically, a slot 16 is formed inside the moving partition 12, with the inner end of the slot 16 extending to intersect with the throttling orifice 15 and the outer end extending to the outer wall of the rotating box 9. An adjusting insert 17 is installed in the slot 16, and the adjusting insert 17 has a teardrop-shaped through hole 18. By changing the depth of the adjusting insert 17 inserted into the slot 16, the overlapping flow area of ​​the through hole 18 and the throttling orifice 15 can be adjusted, thereby continuously and accurately adjusting the flow rate of the damping fluid, realizing stepless adjustment of the rotation speed, and improving the process adaptability of the tooling.

[0046] The telescopic boom 7 adopts an adjustable structure to adapt to working conditions with different diameters and welding angles. The telescopic boom 7 includes a main boom 36 and a secondary boom 37. The secondary boom 37 is inserted into the main boom 36 and its length is locked by the boom length locking bolt 38. The bottom of the main boom 36 has a strip-shaped hole 39 extending along the length direction. A fixing head 40 is fixedly installed below the liquid damping box 6. A diagonal brace 41 is hinged to the fixing head 40 corresponding to each telescopic boom 7. The outer end of the diagonal brace 41 is bent and locked in the strip-shaped hole 39. The angle is locked by the angle locking bolt 42, thereby improving the rigidity of the telescopic boom 7 and preventing vibration displacement during welding. The end of the secondary boom 37 is hinged to a mounting plate 43. The mounting plate 43 is angle locked by the mounting plate locking bolt 44. The welding torch 5 is fixedly installed on the mounting plate 43. The extension length, height and welding angle of the welding torch 5 can be flexibly adjusted to meet the position requirements of multi-torch symmetrical welding.

[0047] The constant force drive mechanism 4 is used to provide a stable and constant driving torque for the rotating box 9, ensuring the constant speed effect of the liquid damping speed limiter. The constant force drive mechanism 4 includes a counterweight 19, a reversing frame 20, and a reduction gear assembly 21 disposed above the liquid damping box 6.

[0048] The reduction assembly 21 includes an L-shaped crank plate 22 fixed to the centering shaft 1. The horizontal section of the crank plate 22 is sleeved on the centering shaft 1 and fixedly connected to it. The vertical section of the crank plate 22 has a through groove 23 extending along its length, and a drive rack 24 that can slide up and down is installed in the through groove 23. A reduction gear 25 is installed on the horizontal section of the crank plate 22, and one side of the reduction gear 25 extends into the through groove 23 and meshes with the drive rack 24. The center of the upper end face of the rotating box 9 extends upward to form a drive neck 26, which is sleeved on the outside of the centering shaft 1, and a drive gear ring 27 is provided on its outer periphery. The wheel shaft of the reduction gear 25 extends downward and meshes with the drive gear ring 27 through key teeth, forming a reduction and torque amplification transmission structure, making the rotational motion smoother.

[0049] The counterweight 19 is connected to the drive rack 24 after passing through the commutator 20 via the draw cable 28. The commutator 20 serves to guide the draw cable 28, and its specific structural forms are varied, for example: Figure 5As shown, the reversing frame 20 includes a Y-shaped frame 33 and guide wheels 34 mounted on the frame 33. A pull cable 28 bypasses the guide wheels 34 to achieve reversal, ensuring the counterweight 19 falls vertically. Gravity provides a constant torque, fundamentally solving the problem of torque variation with stroke in ordinary elastic elements. The specific installation position of the reversing frame 20 is not limited, as long as it can be stably fixed. It can be installed near the working position, either directly on the ground, fixed to the frame by clamps, or by other feasible fixing methods. Since the structure is relatively simple, it will not be described in detail in this invention. In some applications where it is installed laterally, the reversing frame 20 can even be omitted because the counterweight 19 can hang directly downwards.

[0050] To ensure operational safety and reliable initial positioning, a locking hole 29 is provided at the top of the drive rack 24. Corresponding pin holes 30 and pins 31 are provided at the top of the vertical section of the crank plate 22. Inserting the pin 31 into the pin holes 30 and locking hole 29 locks the drive rack 24 in its initial position, facilitating tooling installation, debugging, and pre-welding preparation. A limiting boss 32 is provided at the end of the drive rack 24 furthest from the locking hole 29. When the drive rack 24 moves to its limit position, the limiting boss 32 abuts against the end of the through groove 23, preventing the drive rack 24 from slipping and improving the safety of the tooling.

[0051] The usage method of this tooling is as follows:

[0052] Tooling positioning: Place the tooling into the center hole of the thrust bearing back plate and the machine body, rotate the adjusting sleeve 51 to make the support claw 46 open outward and press against the inner wall, thus completing the centering and fixing of the centering shaft 1.

[0053] Welding gun adjustment: Adjust the length and angle of the telescopic arm 7 according to the bearing diameter, and adjust the angle of the mounting plate 43 so that each welding gun 5 is evenly distributed above the circumferential weld and is symmetrically positioned.

[0054] Drive preparation: Pull the drive rack 24 to the initial position, insert the pin 31 to complete the locking, suspend the counterweight 19 in place, and check that the pull cable 28 and the guide wheel 34 are smooth and without jamming.

[0055] Uniform speed welding: Pull out the pin 31, and the counterweight 19 descends at a uniform speed under the action of gravity, pulling the drive rack 24 to move. Through the reduction gear 25 and the drive gear ring 27, the rotating box 9 rotates at a uniform speed. Under the throttling and speed limiting action of the liquid damping box 6, the rotating box 9 maintains a constant angular velocity. The welding torch 5 performs symmetrical and uniform rotation welding along the annular weld seam, so that the bearing back plate is heated evenly in the circumference and the stress cancels each other out, effectively controlling the welding deformation and ensuring the flatness of the end face and the accuracy of the air film gap.

[0056] Work completed: After welding is finished, retract the telescopic inner support mechanism 2 and remove the tooling.

[0057] In this embodiment, the tooling relies entirely on a purely mechanical structure to achieve centering, constant force drive, and liquid damping speed limiting. It does not depend on electricity, pneumatics, or complex control systems, and can work stably in harsh environments such as the field, high altitude, explosion-proof, and power-free locations. It has a compact structure, is easy to operate, and is highly efficient in assembly and disassembly, significantly improving the assembly accuracy and quality stability of on-site welding of ultra-large air-suspended thrust bearings.

Claims

1. A thrust bearing welding fixture, comprising a centering shaft (1), characterized in that, The centering shaft (1) is provided with a telescopic inner support mechanism (2), a rotary welding mechanism (3) and a constant force drive mechanism (4); the telescopic inner support mechanism (2) can open and support the inner wall of the workpiece and the foundation so that the centering shaft (1) is fixed at the axis of the workpiece and the foundation; the rotary welding mechanism (3) is used to carry the welding torch (5) and can drive the welding torch (5) to rotate around the centering shaft (1) at a constant speed under the drive of the constant force drive mechanism (4) so ​​that an annular weld can be formed between the workpiece and the installation foundation on the rotation path of the welding torch (5); The rotary welding mechanism (3) includes a liquid damping box (6) fixedly installed outside the upper section of the centering shaft (1) and several telescopic carrier arms (7) evenly distributed around the liquid damping box (6); one end of the telescopic carrier arm (7) is connected to the liquid damping box (6), and the other end is equipped with a welding torch (5). The liquid damping box (6) includes an I-shaped fixed plate (8) fixedly mounted on a centering shaft (1), and a hollow cylindrical rotating box (9) sleeved on the fixed plate (8); both ends of the rotating box (9) are sleeved on the centering shaft (1) and rotate in conjunction with the centering shaft (1); the inner end of the telescopic arm (7) is connected to the outer side wall of the rotating box (9); the two end faces of the rotating box (9) abut against the two plates of the fixed plate (8), so that the circumference of the rotating box (9) is in contact with the fixed plate (8). The two plates together form a reservoir (10) filled with damping fluid; the vertical rod of the fixed plate (8) is provided with a fixed partition (11) extending radially along the fixed plate (8), and the inner circumferential surface of the rotating box (9) is provided with a moving partition (12) extending radially along the rotating box (9). The moving partition (12) and the fixed partition (11) divide the reservoir (10) into a first chamber (13) and a second chamber (14) that are independent of each other. The moving partition (12) is provided with a throttling hole (15). The cross-sectional dimensions of the throttling orifice (15) can be adjusted; The moving partition (12) has a slot (16) inside. The inner end of the slot (16) extends to intersect with the throttling orifice (15), and the outer end extends to the outer wall of the rotating box (9). An adjusting insert (17) is provided in the slot (16). The adjusting insert (17) has a teardrop-shaped through hole (18). By changing the length of the adjusting insert (17) inserted into the slot (16), the overlapping area of ​​the through hole (18) and the throttling orifice (15) can be adjusted, thereby adjusting the flow cross-sectional size of the throttling orifice (15).

2. The thrust bearing welding fixture according to claim 1, characterized in that, The constant force drive mechanism (4) includes a counterweight (19), a reversing frame (20), and a deceleration assembly (21) disposed above the liquid damping box (6). The deceleration assembly (21) includes an L-shaped crank plate (22) mounted on a centering shaft (1). The middle part of the horizontal section of the crank plate (22) is sleeved on the centering shaft (1) and fixedly connected to it. A through groove (23) extending along its length is provided on the vertical section of the crank plate (22). A drive rack (24) that slides into the through groove (23) is provided in the through groove (23). A reduction gear (25) is also mounted on the horizontal section of the crank plate (22). One side of (25) extends through a perforation set on the vertical section of the crank plate (22) into the through groove (23) and meshes with the drive rack (24); the center of the upper end face of the rotating box (9) extends upward to form a drive neck (26), the drive neck (26) is sleeved on the centering shaft (1), and a drive gear ring (27) is provided on the circumferential surface of the drive neck (26); the axle of the reduction gear (25) extends downward to one side of the drive gear ring (27) and meshes with the drive gear ring (27) through the key teeth on the axle; The counterweight (19) is connected to the drive rack (24) via a pull wire (28) that passes around the reversing frame (20).

3. The thrust bearing welding fixture according to claim 2, characterized in that, The top of the drive rack (24) is also provided with a locking hole (29). The top of the vertical section of the crank plate (22) is provided with a pin hole (30) and a pin rod (31) that cooperate with the locking hole (29). The drive rack (24) is locked in the initial position by inserting the pin rod (31) into the pin hole (30) and the locking hole (29). A limiting boss (32) is provided at the end of the drive rack (24) away from the locking hole (29), and the limiting boss (32) abuts against the end of the through groove (23) to form a locking in the extreme position.

4. The thrust bearing welding fixture according to claim 3, characterized in that, The commutator (20) includes a Y-shaped frame (33) and a guide wheel (34) mounted on the frame (33), and the pull cable (28) passes around the guide wheel (34) to form a guide.

5. The thrust bearing welding fixture according to claim 1, characterized in that, A sealing ring (35) is provided between the plate body of the fixed plate (8) and the end face of the rotating box (9).

6. The thrust bearing welding fixture according to claim 1, characterized in that, The telescopic boom (7) includes a main boom (36) and a secondary boom (37). The secondary boom (37) is inserted into the main boom (36) and locked by a boom length locking bolt (38). The bottom of the main arm (36) is provided with a strip hole (39) extending along the length of the main arm (36), and a fixing head (40) is provided below the liquid damping box (6). At the fixing head (40), there are multiple diagonal braces (41) corresponding to the number of telescopic arms (7). One end of the diagonal brace (41) is hinged to the fixing head (40), and the other end is bent and locked in the strip hole (39) and locked by an angle locking bolt (42). The end of the auxiliary arm (37) is hinged to a mounting plate (43), and the angle of the mounting plate is locked by a mounting plate locking bolt (44). A welding torch (5) is provided on the mounting plate (43).

7. The thrust bearing welding fixture according to claim 1, characterized in that, The lower end of the centering shaft (1) is provided with a mounting base (45), and the telescopic inner support mechanism (2) includes multiple sets of support claws (46) and drive components (47) provided at the mounting base (45). The support claw (46) includes a pair of claw bars (48) and a claw plate (49). The two ends of the claw bars (48) are respectively hinged to the mounting base (45) and the claw plate (49) to form a parallelogram structure. The drive assembly (47) includes a drive rod (50) and an adjusting sleeve (51) that is sleeved on the centering shaft (1) and has a threaded fit with the centering shaft (1). The adjusting sleeve (51) is sleeved with a rotating ring (52) that has a rotational fit with the adjusting sleeve (51). One end of the drive rod (50) is hinged to the rotating ring (52), and the other end is hinged to the claw plate (49).

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