A large machine tool structural member welding device

Abstract

The application belongs to the technical field of laser welding, and particularly relates to a large-scale machine tool structural part welding device, which comprises a base, two first screw rod linear modules are fixedly connected to the upper side walls of the base in a left-right symmetry mode, a supporting rod is fixedly connected to the moving end of each of the two first screw rod linear modules, the upper ends of the two supporting rods are fixedly connected to the same second screw rod linear module, and the output end of the second screw rod linear module is fixedly connected to a moving plate. The application can simultaneously perform laser welding on the box-shaped structural column of a large-scale machine tool and perform cooling treatment on the welding position from the outside, can control the temperature of the welding area in a directional mode, can quickly lead out the heat accumulated in the closed chamber, can effectively reduce the temperature difference between the welding seam and the base material, can reduce the thermal stress peak value, can significantly inhibit the warping deformation of the plate, and can avoid the out-of-tolerance of the perpendicularity and flatness of the column.

Description

Technical Field

[0001] This invention belongs to the field of laser welding technology, and in particular relates to a welding device for large machine tool structural components. Background Technology

[0002] The box-shaped column of a large machine tool is a core component that ensures the machining accuracy and load-bearing capacity of the machine tool. It is mostly made of high-strength steel plates welded together. The quality of its welds, structural rigidity and dimensional stability directly determine the long-term operational reliability of the machine tool.

[0003] As a core component ensuring the processing accuracy and load-bearing capacity of large machine tools, the box-shaped column is mostly formed by welding high-strength steel plates. Traditional processes such as electric arc welding are prone to severe deformation of the column box due to large heat input and wide heat-affected zone, making it difficult to meet the requirements of high-precision processing. Laser welding, with its significant advantages of low heat input, narrow weld seam, and high welding efficiency, has been gradually applied to the welding of box-shaped column. However, in actual application, due to the closed chamber structure of the box-shaped column, the heat is concentrated at the plate joint during welding, and the heat dissipation conditions inside the chamber are poor, which can easily cause the plate to warp and deform, resulting in excessive deviation of the column's verticality, which seriously affects the assembly accuracy and long-term operational stability of large machine tools.

[0004] To address this issue, a welding device for large machine tool structural components is proposed. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing a welding device for large machine tool structural components.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a welding device for large machine tool structural components, comprising a base, two first lead screw linear modules symmetrically fixedly connected to the upper sidewall of the base, each of the two first lead screw linear modules having a support rod fixedly connected to its moving end, the upper ends of the two support rods being fixedly connected to the same second lead screw linear module, the output end of the second lead screw linear module being fixedly connected to a moving plate, a controller and a first electric push rod fixedly connected to the upper sidewall of the moving plate, the output end of the first electric push rod passing through the moving plate and fixedly connected to a lifting plate, a welding assembly connected to the lower sidewall of the lifting plate, and further comprising:

[0007] A grinding assembly, disposed inside the welding assembly, is used for grinding the weld seam;

[0008] The cooling component is connected to the lifting plate via two bent rods.

[0009] In the above-mentioned welding device for large machine tool structural components, the welding assembly includes a lifting rod fixedly connected to the lower side wall of the lifting plate. A protective motor is fixedly connected to the lower end of the lifting rod. The output end of the protective motor is set downward and fixedly connected to a rotating seat. A first vision sensor is fixedly connected to the lower side wall of the rotating seat. A laser welding head is connected to one side of the rotating seat through a robotic arm.

[0010] In the aforementioned welding device for large machine tool structural components, the grinding assembly includes a grinding box connected to the side wall of a rotating base via a robotic arm. The grinding box and the laser welding head are symmetrically arranged about the rotating base. A grinding motor is fixedly connected to the upper inner wall of the grinding box, and a turntable is fixedly connected to the output end of the grinding motor. A drive shaft is fixedly connected to the lower side wall of the turntable. A sliding opening is provided on the lower side wall of the grinding box. Limiting plates are placed on both the upper and lower sides of the sliding opening. A sliding plate that slides with the sliding opening is fixedly connected to the side wall of the two limiting plates on opposite sides. A support base is fixedly connected to the upper side wall of the upper limiting plate, and an arc-shaped frame that slides with the drive shaft is fixedly connected to the side wall of the support base. A connecting plate is fixedly connected to the lower side wall of the lower limiting plate, and an adjustable grinding head assembly is connected to the lower side wall of the connecting plate.

[0011] In the aforementioned welding device for large machine tool structural components, the adjustable grinding head assembly includes an adjustment box fixedly connected to the lower side wall of a connecting plate. An adjustment motor is fixedly connected to the lower inner wall of the adjustment box. A threaded rod is fixedly connected to the output end of the adjustment motor. A support frame is rotatably connected to the lower end of the threaded rod. A support pin is fixedly connected to the lower end of the support frame. Multiple short rods are rotatably connected to the rod wall of the support pin. The multiple short rods are staggered. The ends of the multiple short rods on the same side away from the support pin are fixedly connected to the same adjustment plate. The lower side walls of two adjustment plates are connected to the same piece of sandpaper. A threaded cylinder is threadedly sleeved on the rod wall of the threaded rod. Adjustment frames are fixedly connected to the side walls of the threaded cylinder and the adjustment plate on opposite sides. The same adjustment pin is rotatably connected to the two adjustment frames on the same side.

[0012] In the above-mentioned welding device for large machine tool structural components, two guide pins are fixedly connected between the support frame and the adjustment box, and guide cylinders that match the guide pins are fixedly connected to both the front and rear sides of the threaded cylinder.

[0013] In the aforementioned welding device for large machine tool structural components, the cooling assembly includes a U-shaped water tank fixedly connected to the lower ends of two bent rods. A U-shaped water pipe is fixedly sleeved on the outer wall of the U-shaped water tank. A water pump is connected to the upper side wall of the U-shaped water pipe. The inlet end of the water pump is connected to the U-shaped water tank, and the outlet end of the water pump is connected to the U-shaped water pipe. Bending plates are fixedly connected to the side walls of the U-shaped water tank. A second electric push rod is connected to the vertical part of the bending plate. The output end of the second electric push rod passes through the bending plate and is connected to a refrigeration box through a pressure sensor. A serpentine water channel is provided inside the refrigeration box. A water supply pipe is connected between the U-shaped water pipe and the refrigeration box. A first control valve is provided inside the water supply pipe. A return water pipe is connected between the U-shaped water tank and the refrigeration box. A second control valve is provided inside the return water pipe.

[0014] In the above-mentioned welding device for large machine tool structural components, the rotating base is connected to two sides near the robotic arm with second vision sensors, and the second vision sensors are electrically connected to the controller.

[0015] In the above-mentioned welding device for large machine tool structural components, multiple semiconductor cooling plates are inserted into the upper side wall of the U-shaped water tank. The cooling end of the semiconductor cooling plate is in contact with the coolant inside the U-shaped water tank, and the heat dissipation end of the semiconductor cooling plate extends out of the U-shaped water tank.

[0016] Compared with existing technologies, the advantages of a welding device for large machine tool structural components are:

[0017] 1. By using a cooling component, the weld area is cooled from the outside while the box-shaped column of a large machine tool is being laser welded. This allows for directional temperature control of the welding area, quickly dissipating heat that easily accumulates in the enclosed chamber, effectively reducing the temperature difference between the weld and the base material, lowering the peak thermal stress, significantly suppressing plate warping, and preventing the column from exceeding dimensional tolerances such as verticality and flatness. Simultaneously, it can precisely control the cooling rate of the molten pool, reducing the formation of hardened structures in the high-strength steel weld and heat-affected zone, lowering the risk of cold cracking, improving the joint's ductility, toughness, and fatigue resistance, ensuring the structural rigidity and long-term operational stability of the column, and providing a reliable precision foundation for subsequent assembly processes.

[0018] 2. The grinding component is designed to grind the weld seams after laser welding of the box-shaped column of a large machine tool. The grinding angle of the component can be flexibly adjusted according to the placement angle of the sheet metal, adapting to the complex weld seam positions and tilted posture of the sheet metal. This allows for the precise removal of defects such as weld excess, undercut, and spatter residue, ensuring that the weld seam is flush with the base material surface and improving the fitting accuracy of the assembly surface. At the same time, it avoids the problem of over-grinding or under-grinding in some areas due to a fixed grinding angle, reducing damage to the base material, ensuring the structural strength of the column, and laying a good foundation for subsequent painting, assembly and other processes. This significantly improves the processing quality and service life of the box-shaped column of the large machine tool.

[0019] 3. By using a base, a first linear lead screw module, a support rod, a second linear lead screw module, a moving plate, a controller, a first electric push rod, a lifting plate, a bending rod, and welding components, the laser welding of the box-shaped column of a large machine tool is carried out vertically with welding from above. This allows the molten pool metal to spread naturally under gravity, reducing defects such as weld porosity and slag inclusions, and improving the weld formation quality and density. At the same time, the vertical posture avoids heat accumulation inside the box-shaped cavity, improves heat dissipation, reduces welding residual stress and the risk of plate warping, and ensures the verticality accuracy of the column. In addition, the top-down welding path makes it easier for the laser head to accurately focus on the weld, improves the consistency of long weld welding, and facilitates the uniform coverage of the molten pool by the protective gas, reducing weld oxidation and ensuring the structural strength and assembly stability of the column. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a welding device for large machine tool structural components provided by the present invention;

[0021] Figure 2 This is a schematic diagram showing the positional relationship between the welding components and the cooling components in a welding device for large machine tool structural parts provided by the present invention;

[0022] Figure 3 This is a schematic diagram of the surface structure of the rotary seat in a welding device for large machine tool structural components provided by the present invention;

[0023] Figure 4 This is a schematic diagram of the grinding component in a welding device for large machine tool structural parts provided by the present invention;

[0024] Figure 5 This is a schematic diagram showing the positional relationship between the arc-shaped frame and the drive shaft in a welding device for large machine tool structural components provided by the present invention;

[0025] Figure 6 This is a schematic diagram showing the positional relationship between the water supply pipe and the return pipe in a welding device for large machine tool structural components provided by the present invention;

[0026] Figure 7This is a schematic diagram of the adjustable grinding head assembly in a welding device for large machine tool structural components provided by the present invention;

[0027] Figure 8 This is a schematic diagram showing the positional relationship of two adjusting plates in a welding device for large machine tool structural components provided by the present invention.

[0028] In the diagram: 1. Base; 2. First lead screw linear module; 3. Support rod; 4. Second lead screw linear module; 5. Moving plate; 6. Controller; 7. First electric push rod; 8. Lifting plate; 9. Bend rod; 10. Welding assembly; 101. Lifting rod; 102. Protective motor; 11. Rotary seat; 12. First vision sensor; 13. Laser welding head; 14. Grinding assembly; 141. Grinding box; 142. Grinding motor; 15. Turntable; 16. Drive shaft; 17. Sliding port; 18. Limiting plate; 19. Sliding plate; 20. Support seat; 21. Arc frame; 22. Connecting plate; 23. Adjustable grinding wheel. Head assembly, 231 regulating box, 232 regulating motor, 24 threaded rod, 25 support frame, 26 support pin, 27 short rod, 28 regulating plate, 29 sandpaper, 30 threaded cylinder, 31 regulating frame, 32 regulating pin, 33 guide pin, 34 guide cylinder, 35 cooling assembly, 351 U-shaped water tank, 352 U-shaped water pipe, 36 water pump, 37 bend plate, 38 second electric push rod, 39 refrigeration box, 40 water supply pipe, 41 first control valve, 42 return water pipe, 43 second control valve, 44 second vision sensor, 45 semiconductor refrigeration plate. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0030] like Figures 1-8 As shown, a welding device for large machine tool structural components includes a base 1. Two first lead screw linear modules 2 are symmetrically fixedly connected to the upper sidewall of the base 1. Support rods 3 are fixedly connected to the moving ends of the two first lead screw linear modules 2. The upper ends of the two support rods 3 are fixedly connected to the same second lead screw linear module 4. A moving plate 5 is fixedly connected to the output end of the second lead screw linear module 4. A controller 6 and a first electric push rod 7 are fixedly connected to the upper sidewall of the moving plate 5. The output end of the first electric push rod 7 passes through the moving plate 5 and is fixedly connected to a lifting plate 8. A welding assembly 10 is connected to the lower sidewall of the lifting plate 8. The welding assembly 10 includes a lifting rod 101 fixedly connected to the lower sidewall of the lifting plate 8. A protective motor 102 is fixedly connected to the lower end of the lifting rod 101. The output end of the protective motor 102 is downward and fixedly connected to a rotating seat 11. A first vision sensor 12 is fixedly connected to the lower sidewall of the rotating seat 11. A laser welding head 13 is connected to one side of the rotating seat 11 via a robotic arm. The device also includes:

[0031] A grinding assembly 14 is disposed inside the welding assembly 10. The grinding assembly 14 includes a grinding box 141, which is connected to the side wall of a rotating base 11 via a robotic arm. The grinding box 141 and the laser welding head 13 are symmetrically arranged about the rotating base 11. A grinding motor 142 is fixedly connected to the upper inner wall of the grinding box 141. A turntable 15 is fixedly connected to the output end of the grinding motor 142. A drive shaft 16 is fixedly connected to the lower side wall of the turntable 15. A sliding opening 17 is provided on the lower side wall of the grinding box 141. Limiting plates 18 are placed on both the upper and lower sides of the sliding port 17. The side walls of the two limiting plates 18 on opposite sides are fixedly connected to the same sliding plate 19 that slides with the sliding port 17. A support base 20 is fixedly connected to the upper side wall of the upper limiting plate 18. An arc frame 21 that slides with the drive shaft 16 is fixedly connected to the side wall of the support base 20. A connecting plate 22 is fixedly connected to the lower side wall of the lower limiting plate 18. An adjustable grinding head assembly 23 is connected to the lower side wall of the connecting plate 22 for grinding the weld.

[0032] The cooling component 35 is connected to the lifting plate 8 via two bent rods 9. The cooling component 35 includes a return-shaped water tank 351 fixedly connected to the lower ends of the two bent rods 9. A return-shaped water pipe 352 is fixedly sleeved on the outer wall of the return-shaped water tank 351. A water pump 36 is connected to the upper side wall of the return-shaped water pipe 352. The inlet end of the water pump 36 is connected to the return-shaped water tank 351, and the outlet end of the water pump 36 is connected to the return-shaped water pipe 352. Bent plates are fixedly connected to the side walls of the return-shaped water tank 351. 37. A second electric push rod 38 is connected to the vertical part of the bent plate 37. The output end of the second electric push rod 38 passes through the bent plate 37 and is connected to the refrigeration box 39 through a pressure sensor. The refrigeration box 39 is provided with a serpentine water channel. A water supply pipe 40 is connected between the return water pipe 352 and the refrigeration box 39. A first control valve 41 is provided in the water supply pipe 40. A return water pipe 42 is connected between the return water tank 351 and the refrigeration box 39. A second control valve 43 is provided in the return water pipe 42.

[0033] The adjustable grinding head assembly 23 includes an adjustment box 231 fixedly connected to the lower side wall of the connecting plate 22. An adjustment motor 232 is fixedly connected to the lower inner wall of the adjustment box 231. A threaded rod 24 is fixedly connected to the output end of the adjustment motor 232. A support frame 25 is rotatably connected to the lower end of the threaded rod 24. A support pin 26 is fixedly connected to the lower end of the support frame 25. Multiple short rods 27 are rotatably connected to the rod wall of the support pin 26. The multiple short rods 27 are staggered. The ends of the multiple short rods 27 on the same side away from the support pin 26 are fixedly connected to the same adjustment plate 28. The lower side walls of the two adjustment plates 28 are connected to the same piece of sandpaper 29. A threaded cylinder 30 is threadedly sleeved on the rod wall of the threaded rod 24. Adjustment frames 31 are fixedly connected to the side walls of the threaded cylinder 30 and the adjustment plate 28 on opposite sides. The same adjustment pin 32 is rotatably connected to the two adjustment frames 31 on the same side. Two guide pins 33 are fixedly connected between the support frame 25 and the adjustment box 231. Guide cylinders 34 that match the guide pins 33 are fixedly connected to both the front and rear sides of the threaded cylinder 30.

[0034] The rotating base 11 is connected to two sides near the robotic arm with second vision sensors 44, which are electrically connected to the controller 6.

[0035] Multiple semiconductor cooling plates 45 are inserted into the upper side wall of the U-shaped water tank 351. The cooling end of the semiconductor cooling plate 45 is in contact with the coolant inside the U-shaped water tank 351, and the heat dissipation end of the semiconductor cooling plate 45 extends out of the U-shaped water tank 351.

[0036] The operating principle of this invention is explained as follows: The operator uses a crane to place the box-shaped column of the large machine tool onto the upper side wall of the base 1. Then, the operator sends an electrical signal to the controller 6 via an external remote control switch. Upon receiving this signal, the controller 6 first controls the first lead screw linear module 2 and the second lead screw linear module 4 to operate, and simultaneously controls the first vision sensor 12 to operate. Through the coordinated operation of the first lead screw linear module 2 and the second lead screw linear module 4, the rotary seat 11 moves to the center position above the box-shaped column of the large machine tool. Next, the controller 6 controls the first electric push rod 7 to operate. Rod 7 controls the lifting plate 8 to move downwards. The lifting plate 8 drives the protective motor 102, the rotating seat 11, and the laser welding head 13 to move closer to the inside of the box-shaped column via the lifting rod 101. (When welding the plate and stiffening plate inside the box-shaped column of the machine tool with a laser welding machine, it is necessary to first position it with special tooling and pre-fix it manually with laser or resistance spot welding before subsequent continuous laser welding to ensure assembly accuracy and control welding deformation.) During the movement of the rotating seat 11, the controller 6 detects the position inside the box-shaped column that needs to be laser welded through the second vision sensor 44 and drives the laser welding head 13 to perform welding work through the robotic arm on one side.

[0037] While the lifting plate 8 moves the laser welding head 13 downwards, it also moves the U-shaped water tank 351 downwards via the bent rod 9. Simultaneously, as the laser welding head 13 performs welding, the controller 6 controls four second electric push rods 38 to operate simultaneously. These second electric push rods 38, via pressure sensors, bring the cooling box 39 into contact with the outer surface of the box-shaped column. When the laser welding head 13 welds on one side of the box-shaped column's interior, the controller 6 controls the semiconductor cooling plate 45 to operate, using the semiconductor cooling plate 45 to cool the refrigerant inside the U-shaped water tank 351. At the same time, the controller 6 also... The controller 6 will control the operation of the water pump 36, which will deliver the cooled refrigerant to the return water pipe 352. The controller 6 will control the opening of the first control valve 41 and the second control valve 43 in the corresponding direction, so that the refrigerant can be delivered to the corresponding cooling box 39 through the corresponding water supply pipe 40. The cooling box 39 will cool the weld from the outside. The temperature of the weld area can be controlled in a directional manner, and the heat that is easily accumulated in the closed chamber can be quickly discharged. This will effectively reduce the temperature difference between the weld and the base material, reduce the peak thermal stress, significantly suppress the warping deformation of the plate, and avoid exceeding the standard of the verticality, flatness and other geometric tolerances of the column.

[0038] After the welding work on one side of the box-shaped column is completed, the controller 6 will control the protective motor 102 to work. The protective motor 102 drives the laser welding head 13 and the grinding component 14 to switch positions via the rotating seat 11. The laser welding head 13 is used to weld the plate on the other side of the box-shaped column. At the same time, the controller 6 drives the grinding component 14 to grind the weld seam via another robotic arm. The controller 6 judges the angle and position of the weld seam through the corresponding second vision sensor 44, and then adjusts the angle between the two adjustment plates 28. The controller 6 will control the adjustment motor 232 to work. The adjustment motor 232 will drive the threaded rod 24 to rotate, and control the threaded cylinder 30 to move downward or upward by a certain amount through the thread engagement. Positioning: The threaded cylinder 30, through the cooperation of the adjusting frame 31 and the adjusting pin 32, drives the two adjusting plates 28 to rotate at an appropriate angle. Then, the controller 6, through the mechanical arm, moves the two adjusted adjusting plates 28 to the weld and fits with the weld. Next, the controller 6 controls the grinding motor 142 to work. The grinding motor 142 drives the drive shaft 16 to rotate through the turntable 15. The drive shaft 16, through its cooperation with the arc frame 21, drives the support seat 20, the limit plate 18, the sliding plate 19, the adjusting box 231, and the two adjusting plates 28 to move back and forth. The adjusting plates 28, through the sandpaper 29, precisely remove defects such as weld excess height, undercut, and spatter residue, ensuring that the weld is flush with the surface of the base material and improving the fitting accuracy of the assembly surface.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A welding device for large machine tool structural components, comprising a base (1), wherein two first lead screw linear modules (2) are symmetrically fixedly connected to the upper sidewall of the base (1), and a support rod (3) is fixedly connected to the moving end of each of the two first lead screw linear modules (2). The upper ends of the two support rods (3) are fixedly connected to the same second lead screw linear module (4), and a moving plate (5) is fixedly connected to the output end of the second lead screw linear module (4). A controller (6) and a first electric push rod (7) are fixedly connected to the upper sidewall of the moving plate (5). The output end of the first electric push rod (7) passes through the moving plate (5) and is fixedly connected to a lifting plate (8). A welding assembly (10) is connected to the lower sidewall of the lifting plate (8). Also includes: A grinding assembly (14) is disposed inside the welding assembly (10) for grinding the weld seam; The cooling component (35) is connected to the lifting plate (8) via two bent rods (9). The welding component (10) includes a lifting rod (101) fixedly connected to the lower side wall of the lifting plate (8). A protective motor (102) is fixedly connected to the lower end of the lifting rod (101). The output end of the protective motor (102) is set downwards and fixedly connected to a rotating seat (11). A first vision sensor (12) is fixedly connected to the lower side wall of the rotating seat (11). A laser welding head (13) is connected to one side of the rotating seat (11) via a first robotic arm. The grinding component (14) includes a grinding box (141). The grinding box (141) is connected to the rotating seat (11) via a second robotic arm. The grinding box (141) and the laser welding head (13) are symmetrically arranged about the rotating seat (11) with respect to the side wall connection. A grinding motor (142) is fixedly connected to the upper inner wall of the grinding box (141). A turntable (15) is fixedly connected to the output end of the grinding motor (142). A drive shaft (16) is fixedly connected to the lower side wall of the turntable (15). A sliding port (17) is opened on the lower side wall of the grinding box (141). Limiting plates (18) are placed on both the upper and lower sides of the sliding port (17). The side wall of the two limiting plates (18) on opposite sides is fixedly connected to the same sliding plate (19) that slides with the sliding port (17). The upper side of the upper limiting plate (18) is located on the upper side of the sliding plate (18). A support base (20) is fixedly connected to the wall. An arc-shaped frame (21) that slides with the drive shaft (16) is fixedly connected to the side wall of the support base (20). A connecting plate (22) is fixedly connected to the lower side wall of the limiting plate (18) located on the lower side. An adjustable grinding head assembly (23) is connected to the lower side wall of the connecting plate (22). The adjustable grinding head assembly (23) includes an adjustment box (231) fixedly connected to the lower side wall of the connecting plate (22). An adjustment motor (232) is fixedly connected to the lower inner wall of the adjustment box (231). A threaded rod (24) is fixedly connected to the output end of the adjustment motor (232). A support frame (25) is rotatably connected to the lower end of the threaded rod (24). The lower end of the support frame (25) is fixedly connected to a support pin (26). The support pin (26) is rotatably connected to multiple short rods (27). The multiple short rods (27) are staggered. The ends of the multiple short rods (27) located on the same side away from the support pin (26) are fixedly connected to the same adjusting plate (28). The lower side walls of the two adjusting plates (28) are connected to the same piece of sandpaper (29). The threaded rod (24) is threadedly fitted with a threaded cylinder (30). The side walls of the threaded cylinder (30) and the adjusting plate (28) on opposite sides are fixedly connected to adjusting frames (31). The two adjusting frames (31) located on the same side are rotatably connected to the same adjusting pin (32).

2. The welding device for large machine tool structural components according to claim 1, characterized in that, Two guide pins (33) are fixedly connected between the support frame (25) and the adjustment box (231), and guide cylinders (34) that match the guide pins (33) are fixedly connected to both the front and rear sides of the threaded cylinder (30).

3. The welding device for large machine tool structural components according to claim 1, characterized in that, The cooling component (35) includes a loop-shaped water tank (351) fixedly connected to the lower ends of two bent rods (9). A loop-shaped water pipe (352) is fixedly fitted on the outer wall of the loop-shaped water tank (351). A water pump (36) is connected to the upper side wall of the loop-shaped water pipe (352). The inlet end of the water pump (36) is connected to the loop-shaped water tank (351), and the outlet end of the water pump (36) is connected to the loop-shaped water pipe (352). Bending plates (37) are fixedly connected to the side walls of the loop-shaped water tank (351). The vertical part of the bending plate (37) A second electric push rod (38) is connected, the output end of the second electric push rod (38) passes through the bending plate (37) and is connected to the refrigeration box (39) through a pressure sensor. The refrigeration box (39) is provided with a serpentine water channel. A water supply pipe (40) is connected between the return water pipe (352) and the refrigeration box (39). A first control valve (41) is provided in the water supply pipe (40). A return water pipe (42) is connected between the return water tank (351) and the refrigeration box (39). A second control valve (43) is provided in the return water pipe (42).

4. The welding device for large machine tool structural components according to claim 2, characterized in that, The rotating base (11) is connected to two sides near the robotic arm with a second vision sensor (44), and the second vision sensor (44) is electrically connected to the controller (6).

5. A welding device for large machine tool structural components according to claim 3, characterized in that, Multiple semiconductor cooling plates (45) are inserted into the upper side wall of the U-shaped water tank (351). The cooling end of the semiconductor cooling plate (45) is in contact with the coolant inside the U-shaped water tank (351), and the heat dissipation end of the semiconductor cooling plate (45) extends out of the U-shaped water tank (351).

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