A welding device for machining mechanical parts

Abstract

The present invention provides a welding device for machining mechanical parts, comprising a welding assembly, a driving assembly and a clamping assembly; wherein the welding assembly comprises a mounting seat and a welding gun, the mounting seat is fixed, and the welding gun moves circumferentially on the mounting seat; two driving assemblies are provided and are respectively located on both sides of the welding assembly, each driving assembly comprises a mounting sleeve, a connecting sleeve and an extrusion block, the mounting sleeve is provided on the mounting seat, the connecting sleeve is rotatably connected to the mounting sleeve and rotates under the action of an external force, a plurality of extrusion blocks are provided on the inner ring wall surface of the connecting sleeve, the mounting sleeves and the connecting sleeves of the two driving assemblies are coaxial with the circular motion trajectory of the welding gun; the clamping assembly is provided on the mounting sleeve and clamps the parts to be welded under the drive of the extrusion block.

Description

Technical Field

[0001] The invention relates to the field of welding devices, and more particularly to a welding device for machining mechanical parts. Background Art

[0002] Welding equipment refers to the equipment required to implement the welding process. Welding equipment includes welding machines, welding process equipment and welding auxiliary tools. With the development of society and the advancement of science and technology, the manufacturing process of spare parts is often inseparable from the welding process. Two different workpieces are connected together through the welding process. However, reasonable welding equipment is required in the welding process. Special customized welding equipment can improve work efficiency and ensure the quality of spare parts. In the existing technology, it is difficult for welding devices to clamp and fix components such as stainless steel pipes of different diameters, and the applicability is low.

[0003] After searching, we found that the document with announcement number CN214868209U disclosed a welding device specially used for automobile parts processing. The document has the basic function of welding parts, but in actual operation, we found an obvious limitation in its design. Specifically, the device uses two fixed-distance claws to clamp the parts, which means that during the processing, we cannot flexibly adjust the distance between the two claws according to the length of the parts. This fixity greatly limits the versatility and adaptability of the device. In view of this, we propose a welding device for mechanical parts processing. Summary of the invention

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a welding device for machining mechanical parts, which can install tubular parts of different lengths, thereby improving the versatility and adaptability of the device.

[0005] In order to solve the above-mentioned technical problems, the present invention provides the following technical solutions: a welding device for machining mechanical parts, comprising a welding assembly, a driving assembly, and a clamping assembly; wherein the welding assembly comprises a mounting seat and a welding gun, the mounting seat is fixed, and the welding gun moves circumferentially on the mounting seat; two driving assemblies are arranged and are respectively located on both sides of the welding assembly, each driving assembly comprises a mounting sleeve, a connecting sleeve, and an extrusion block, the mounting sleeve is arranged on the mounting seat, the connecting sleeve is rotatably connected to the mounting sleeve and rotates under the action of external force, there are a plurality of extrusion blocks and they are arranged on the inner ring wall surface of the connecting sleeve, the mounting sleeves and the connecting sleeves of the two driving assemblies are coaxial with the circular motion trajectory of the welding gun; the clamping assembly is arranged on the mounting sleeve and clamps the parts to be welded under the drive of the extrusion block.

[0006] Furthermore, the clamping assembly includes several structures, each structure including a connecting rod, a first spring, a limit rod, a mounting tube, an external sleeve, and a positioning block, wherein each connecting rod passes through the mounting sleeve along the radial direction of the mounting sleeve, the first spring is located outside the mounting sleeve and its two ends are respectively fixedly connected to the end of the connecting rod and the outer wall of the mounting sleeve, the limit rod is arranged on the movement path of the extrusion block, the limit rod is fixedly arranged on the connecting rod, the mounting tube is fixedly arranged on the end of the connecting rod, two external sleeves are arranged and are respectively arranged at the two ends of the mounting tube, and the two ends of the positioning block are respectively arranged on the two external sleeves.

[0007] Furthermore, the clamping assembly also includes a supporting shaft, a knob, a fixing plate, a positioning rod, and a second spring, wherein the supporting shaft is fixed to the axis of the mounting tube through an external plate, the external sleeve is rotatably connected to both sides of the supporting shaft, the knob is arranged on one of the external sleeves, a plurality of mounting holes are arranged on the external sleeve on which the knob is arranged, the fixing plate is arranged on the mounting tube, the positioning rod passes through the fixing plate and is inserted into one of the mounting holes, an end cover is arranged at the end of the positioning rod, the second spring is sleeved on the positioning rod and the two ends are respectively fixedly connected to the end cover and the fixing plate.

[0008] Furthermore, the welding assembly also includes a support plate, a hydraulic cylinder, an extension tube, a first support plate, a second motor, a first gear, a second support plate, and a gas tank. The outer wall of the mounting seat is fixedly connected to the support plate, the inner wall of the support plate is rotatably connected to the extension tube, the outer wall of the extension tube is fixedly connected to the first gear ring, the top of the support plate is fixedly connected to the first support plate, the bottom of the first support plate is fixedly connected to the second motor, the output end of the second motor is fixedly connected to the first gear, the first gear is meshed with the first gear ring, the outer wall of the extension tube is fixedly connected to the second support plate, the top of the second support plate is fixedly connected to the hydraulic cylinder, the output end of the hydraulic cylinder passes through the second support plate and is slidably connected to it, the output end of the hydraulic cylinder is fixedly connected to a welding gun, the top of the mounting seat is fixedly connected to the gas tank, the exhaust end of the gas tank is fixedly connected to the gas pipe, and the welding gun is fixedly connected to the gas pipe.

[0009] Furthermore, the welding assembly also includes a bidirectional threaded rod, a connecting block, a fixed seat, and a first motor. A mounting groove is provided on the bottom surface of the mounting seat, and the inner wall of the mounting groove is rotatably connected to the bidirectional threaded rod. The inner wall of the mounting groove is symmetrically structured and slidingly connected to two connecting blocks. The outer wall of the mounting seat is fixedly connected to the fixing seat, and the top of the fixing seat is fixedly connected to the first motor. Both ends of the bidirectional threaded rod respectively penetrate the connecting block and are threadedly connected to it, and both ends of the bidirectional threaded rod respectively penetrate the mounting seat and extend to its outside, and the output end of the first motor is fixedly connected to the end of the bidirectional threaded rod.

[0010] Furthermore, each driving assembly also includes a second gear ring, a support block, a mounting plate, a third motor, and a second gear, wherein the second gear ring is fixedly arranged along the circumferential outer wall of the connecting sleeve, the outer wall of the mounting sleeve is fixedly connected to the support block, the top of the support block is fixedly connected to the mounting plate, the bottom of the mounting plate is fixedly connected to the third motor, the output end of the third motor is fixedly connected to a connecting shaft, the end of the connecting shaft passes through the support block and is rotatably connected to it, and two second gears are fixedly connected to the circumferential outer wall of the connecting shaft, and the second gears are respectively meshed with the second gear ring.

[0011] Furthermore, a mounting ring is fixedly connected to the circumferential outer wall of the connecting rod, and two limiting rods are fixedly connected to the mounting ring.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] (1) In the present invention, the ends of two tubular mechanical parts are respectively sleeved inside two mounting sleeves, and the connecting shaft is driven to rotate by the third motor, and the connecting shaft drives the second gear to rotate, and the second gear drives the second gear ring to rotate, and the connecting sleeve is driven to rotate by the second gear ring, and the extrusion block is driven to rotate by the connecting sleeve, and the multiple limit rods are squeezed by the extrusion block. At this time, the connecting rod slides into the inside of the mounting sleeve, and the first spring is compressed. At this time, the connecting rod pushes the mounting cylinder to move, and the parts are squeezed and fixed by the multiple positioning blocks on the mounting cylinder. The bidirectional threaded rod is driven to rotate by the first motor. At this time, the two connecting blocks drive the two mounting sleeves to move, and the tubular parts are driven to move by the mounting sleeve, so that the end faces of the two parts are connected to each other, and tubular parts of different lengths can be installed, thereby improving the versatility and adaptability of the device.

[0014] (2) In the present invention, the third motor drives the connecting shaft to rotate, the connecting shaft drives the second gear to rotate, the second gear drives the second gear ring to rotate, the second gear ring drives the connecting sleeve to rotate, the connecting sleeve drives the extrusion block to rotate, and the extrusion block extrudes multiple limit rods. At this time, the connecting rod slides into the inside of the installation sleeve, and the first spring is compressed. At this time, the connecting rod pushes the installation tube to move, and the parts are squeezed and fixed by the multiple positioning blocks on the installation tube. This design can clamp tubular parts of different diameters.

[0015] (3) In the present invention, the welding gun is pushed downward by a hydraulic cylinder and contacts the ends of two tubular parts, thereby welding the parts. The second motor drives the first gear to rotate, the first gear drives the first gear ring to rotate, the first gear ring drives the extension tube to rotate, and the welding gun is driven to rotate through the extension tube, thereby realizing circular trajectory welding.

[0016] (4) In the present invention, by pulling the pull ring outward, the pull ring drives the positioning rod to slide along the inner wall of the fixed plate. At this time, the second spring is compressed, so that the positioning rod moves out from the inner wall of the slot. By turning the knob, the outer sleeve is driven to rotate, and the support plate is driven to rotate. The positioning block is driven to rotate by the support plate, so that the positions of multiple positioning blocks can be adjusted to clamp tubular parts with different outer diameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 It is a schematic diagram of the local structure of the present invention.

[0019] Figure 3 It is a schematic diagram of the overall structure of the welding assembly of the present invention.

[0020] Figure 4 It is a schematic diagram of the local structure of the welding assembly of the present invention.

[0021] Figure 5 It is a schematic diagram of the overall structure of the drive assembly of the present invention.

[0022] Figure 6 It is a schematic diagram of the overall structure of the clamping assembly of the present invention.

[0023] Figure 7 It is a schematic diagram of the partial structure of the clamping assembly of the present invention.

[0024] Figure 8 It is a schematic diagram of the local structure of the support shaft of the present invention.

[0025] In the figure, welding assembly 1, mounting seat 101, mounting groove 102, bidirectional threaded rod 103, connecting block 104, fixing seat 105, first motor 106, supporting plate 107, gas tank 108, gas pipe 109, hydraulic cylinder 110, welding gun 111, extension pipe 112, first gear ring 113, first supporting plate 114, second motor 115, first gear 116, second supporting plate 117, driving assembly 2, mounting sleeve 201, connecting sleeve 202, second gear ring 203, extrusion block 204, supporting block 20 5, mounting plate 206, connecting shaft 207, third motor 208, second gear 209, clamping assembly 3, connecting rod 301, limiting sleeve 302, first spring 303, fixing sleeve 304, mounting ring 305, limiting rod 306, mounting cylinder 307, fixing plate 308, positioning rod 309, end cover 310, pull ring 311, supporting shaft 312, external plate 313, external sleeve 314, mounting hole 315, support plate 316, knob 317, slot 318, positioning block 319, second spring 320. DETAILED DESCRIPTION

[0026] like Figure 1 and Figure 2 As shown, a welding device for machining mechanical parts includes a welding assembly 1, on which two driving assemblies 2 are installed, and inner walls of the two driving assemblies 2 are both installed with clamping assemblies 3, the welding assembly 1 is used to weld tubular parts, the driving assembly 2 is used to drive the clamping assembly 3 to rotate, and the clamping assembly 3 is used to fix the tubular parts.

[0027] like Figure 3 and Figure 4 As shown, the welding assembly 1 includes a mounting seat 101, a mounting groove 102 is opened on the top of the mounting seat 101, a bidirectional threaded rod 103 is rotatably connected to the inner wall of the mounting groove 102, the inner wall of the mounting groove 102 is symmetrically structured and slidingly connected to two connecting blocks 104, the outer wall of the mounting seat 101 is fixedly connected to a fixing seat 105, the top of the fixing seat 105 is fixedly connected to a first motor 106, both ends of the bidirectional threaded rod 103 respectively penetrate the mounting seat 101 and extend to the outside thereof, both ends of the bidirectional threaded rod 103 respectively penetrate the connecting block 104 and are threadedly connected thereto, and the output end of the first motor 106 is fixedly connected to the end of the bidirectional threaded rod 103.

[0028] A support plate 107 is fixedly connected to the outer wall of the mounting seat 101, an extension tube 112 is rotatably connected to the inner wall of the support plate 107, a first gear ring 113 is fixedly connected to the outer wall of the extension tube 112, a first support plate 114 is fixedly connected to the top of the support plate 107, a second motor 115 is fixedly connected to the bottom of the first support plate 114, a first gear 116 is fixedly connected to the output end of the second motor 115, the first gear 116 is meshed with the first gear ring 113, a second support plate 117 is fixedly connected to the outer wall of the extension tube 112, a gas tank 108 is fixedly connected to the top of the mounting seat 101, an air supply pipe 109 is fixedly connected to the exhaust end of the gas tank 108, a hydraulic cylinder 110 is fixedly connected to the top of the second support plate 117, an output end of the hydraulic cylinder 110 passes through the second support plate 117 and is slidably connected thereto, a welding gun 111 is fixedly connected to the output end of the hydraulic cylinder 110, and the welding gun 111 is fixedly connected to the air supply pipe 109.

[0029] The welding gun 111 is pushed downward by the hydraulic cylinder 110 and contacts the ends of the two tubular parts, thereby welding the parts. The second motor 115 drives the first gear 116 to rotate, the first gear 116 drives the first gear ring 113 to rotate, the first gear ring 113 drives the extension tube 112 to rotate, and the welding gun 111 is driven to rotate through the extension tube 112, thereby realizing circular trajectory welding.

[0030] like Figure 5As shown, the driving assembly 2 includes a mounting sleeve 201, the outer wall of the mounting sleeve 201 is fixedly connected to the top of the connecting block 104, the two ends of the mounting sleeve 201 are rotatably connected to the connecting sleeves 202, the circumferential outer walls of the two connecting sleeves 202 are fixedly connected to the second gear ring 203, and the inner walls of the two connecting sleeves 202 are both annular and evenly spaced structures and fixedly connected to multiple extrusion blocks 204.

[0031] A support block 205 is fixedly connected to the outer wall of the mounting sleeve 201, a mounting plate 206 is fixedly connected to the top of the support block 205, a third motor 208 is fixedly connected to the bottom of the mounting plate 206, a connecting shaft 207 is fixedly connected to the output end of the third motor 208, an end of the connecting shaft 207 passes through the support block 205 and is rotatably connected thereto, two second gears 209 are fixedly connected to the circumferential outer wall of the connecting shaft 207, and the two second gears 209 are respectively meshed with the second gear ring 203.

[0032] like Figures 6 to 8 As shown, the clamping assembly 3 includes a connecting rod 301, the end of the connecting rod 301 passes through the mounting sleeve 201 and is slidably connected thereto, the outer end of the connecting rod 301 is sleeved with a first spring 303, the outer end of the connecting rod 301 is fixedly connected to a limiting sleeve 302, the circumferential outer wall of the connecting rod 301 is slidably connected to a fixing sleeve 304, the end of the fixing sleeve 304 is fixedly connected to the outer wall of the mounting sleeve 201, one end of the first spring 303 is fixedly connected to the limiting sleeve 302, the other end of the first spring 303 is fixedly connected to the fixing sleeve 304, the circumferential outer wall of the connecting rod 301 is fixedly connected to a mounting ring 305, the circumferential outer wall of the mounting ring 305 is fixedly connected to two limiting rods 306, and the inner end of the connecting rod 301 is fixedly connected to a mounting cylinder 307.

[0033] The clamping assembly 3 also includes a plurality of positioning blocks 319. The outer wall of the mounting cylinder 307 is fixedly connected to a fixing plate 308. The inner wall of the fixing plate 308 is slidably connected to a positioning rod 309. The outer wall of the positioning rod 309 is sleeved with a second spring 320. The end of the positioning rod 309 is fixedly connected to an end cover 310. The outer wall of the end cover 310 is fixedly connected to a pull ring 311. The inner wall of the mounting cylinder 307 is sleeved with a support shaft 312. The outer wall of the support shaft 312 is fixedly connected to two external plates 313. The external plates The end 313 is fixedly connected to the inner wall of the mounting tube 307, and both ends of the support shaft 312 are rotatably connected to the external sleeves 314, and the outer wall of one of the external sleeves 314 is provided with a plurality of mounting holes 315, and the end of the positioning rod 309 passes through the mounting hole 315 and is slidably connected thereto, and the outer walls of the two external sleeves 314 are fixedly connected to the knobs 317, and the outer walls of the two external sleeves 314 are fixedly connected to a plurality of supporting plates 316, and the two ends of the plurality of positioning blocks 319 are fixedly connected to the supporting plates 316 respectively. A plurality of support plates 316 are respectively slidably connected to the mounting tube 307, a slot 318 is provided on the outer wall of the support shaft 312, an end of the positioning rod 309 is snap-fitted with the inner wall of the slot 318, one end of the first spring 301 is fixedly connected to the limiting sleeve 302, and the other end of the first spring 301 is fixedly connected to the fixing sleeve 304, the connecting shaft 207 is driven to rotate by the third motor 208, the connecting shaft 207 drives the second gear 209 to rotate, the second gear ring 203 is driven to rotate by the second gear 209, the connecting sleeve 202 is driven to rotate by the second gear ring 203, the extrusion block 204 is driven to rotate by the connecting sleeve 202, and the plurality of limiting rods 306 are extruded by the extrusion block 204, at this time, the connecting rod 301 slides into the inside of the mounting sleeve 201, the first spring 303 is compressed, at this time, the connecting rod 301 pushes the mounting tube 307 to move, and the parts are extruded and fixed by the plurality of positioning blocks 319 on the mounting tube 307, and this design can clamp tubular parts of different diameters.

[0034] Embodiment: The ends of the two tubular mechanical parts are respectively sleeved inside the two mounting sleeves 201, and the third motor 208 is started. The connecting shaft 207 rotates and drives the second gear 209 to rotate. The second gear 209 drives the second gear ring 203 to rotate, thereby causing the connecting sleeve 202 to rotate, and the extrusion block 204 rotates synchronously. The extrusion block 204 squeezes multiple limit rods 306. The extrusion block 204 has a certain inclination angle. When the connecting sleeve 202 rotates, the bottom of the extrusion block 204 first contacts the limit rod 306. At this time, the limit rod 306 does not move, and the mounting ring 305 does not drive the connecting rod 301 to move. When the connecting sleeve 202 rotates further, the extrusion block 204 starts to push the limiting rod 306 with the inclined surface. The greater the rotation amplitude of the connecting sleeve 202 is, the more the extrusion block 204 pushes the limiting rod 306 to a position further away from the inner wall of the mounting sleeve 201. At this time, the mounting ring 305 drives the connecting rod 301 to slide into the inside of the mounting sleeve 201, and the first spring 303 is compressed. Under the restriction of the fixing sleeve 304, a part of the rear end of the connecting rod 301 is still outside the mounting sleeve 201. Because the first spring 303 is compressed, the clamping assembly 3 located inside the mounting sleeve 201 can be stably fixed. When the connecting rod 301 moves, it simultaneously pushes the mounting cylinder 307 to move The parts are squeezed and fixed by the multiple positioning blocks 319 on the mounting cylinder 307. When fixing some relatively small parts or requiring more stable fixing requirements, the pull ring 311 can be pulled outward, and the pull ring 311 drives the positioning rod 309 to slide along the inner wall of the fixing plate 308. At this time, the second spring 320 is compressed, so that the positioning rod 309 moves out from the inner wall of the slot 318. The outer sleeve 314 is driven to rotate by turning the knob 317, and the outer sleeve 314 drives the support plate 316 to rotate. The positioning block 319 is driven to rotate by the support plate 316, so that the positions of multiple positioning blocks 319 can be adjusted. Using a single positioning block 31 9 contacts the mechanical parts, or clamps the mechanical parts into the gap between the two positioning blocks 319. This method can more stably limit the position of the mechanical parts to be suitable for tubular parts with different outer diameters. After loosening the pull ring 311, under the elastic force of the second spring 320, the end of the positioning rod 309 can be inserted into the mounting hole 315 on the external sleeve 314, and after passing through the mounting hole 315, it is clamped with the card slot 318, so that the positioning block 319 can be fixed. The four clamping components 3 are set synchronously. If there are more sophisticated fixing requirements, the mechanical parts can be stably fixed inside the mounting sleeve 201 after multiple adjustments.

[0035] In the prior art, a relatively simple clamping mode is used to fix two opposing steel pipes, which can have a good fixing effect on intact large steel pipes. However, if the steel pipe is small in size, or is damaged during transportation and use, that is, after the surface of the steel pipe is deformed, the clamping mode of the prior art cannot fix the steel pipe well, which leads to deviation in the relative position of the welding surfaces of the two steel pipes, which is not conducive to subsequent welding work. In the present invention, by turning the knob 317 and pulling the pull ring 311, the angle of the positioning block 319 can be adjusted, and the plurality of positioning blocks 319 arranged on the mounting tube 307 will rotate a certain angle. When welding, a single positioning block 319 can be used to clamp the steel pipe, and the operation is repeated to adjust the remaining mounting tubes 307 to the desired angle, that is, a specific positioning block 319 on each of the four mounting tubes 307 is used to clamp the steel pipe inside the mounting sleeve 201. In special circumstances, a more stable fixing method is required. At this time, the positioning block 319 is rotated by a certain angle to confine the steel pipe to the position between the two positioning blocks 319 on the same mounting tube 307, and the operation is repeated to adjust the remaining mounting tubes 307 to the desired angle, so that the steel pipe is confined in the eight positioning blocks 319, which can ensure the stability of the steel pipe during welding.

[0036] After the two mechanical parts are fixed, the bidirectional threaded rod 103 is driven to rotate by the first motor 106. At this time, the two connecting blocks 104 drive the two installation sleeves 201 to move towards each other, and the installation sleeves 201 drive the tubular part to move, so that the end faces of the two parts contact each other.

[0037] At this time, the hydraulic cylinder 110 pushes the welding gun 111 downward and contacts the ends of the two tubular parts, thereby welding the parts. The second motor 115 drives the first gear 116 to rotate, and then drives the first ring gear 113 to rotate. The first ring gear 113 drives the extension tube 112 to rotate, and the welding gun 111 is driven to rotate through the extension tube 112. Because the extension tube 112 and the mounting sleeve 201 are arranged on the same axis, the welding gun 111 can contact all the contact end surfaces of the two tubular parts when rotating on the extension tube 112, thereby realizing circular trajectory welding. Because the welding trajectory is limited, it is more reliable and low-cost than pure manual welding.

Claims

1. A welding device for machining mechanical parts, characterized in that: It comprises a welding assembly (1), a driving assembly (2), and a plurality of clamping assemblies (3); The welding assembly (1) comprises a mounting seat (101), a bidirectional threaded rod (103), a connecting block (104), a fixing seat (105), and a welding gun (111); a mounting groove (102) is provided on the upper bottom surface of the mounting seat (101); a bidirectional threaded rod (103) is rotatably connected to the inner wall of the mounting groove (102); the inner wall of the mounting groove (102) is symmetrically structured and slidably connected to two connecting blocks (104); and two ends of the bidirectional threaded rod (103) respectively penetrate the connecting blocks (104) and are threadedly connected thereto; The driving assembly (2) comprises a mounting sleeve (201), a connecting sleeve (202), and a plurality of extrusion blocks (204); the mounting sleeve (201) is fixedly connected to the connecting block (104); the connecting sleeve (202) is rotatably connected to the mounting sleeve (201), and the extrusion block (204) is fixed to the inner wall of the connecting sleeve (202); the welding gun (111) is rotatably arranged and is coaxial with the rotation trajectory of the connecting sleeve (202); The clamping components (3) are evenly arranged on the mounting sleeve (201). Each clamping component (3) comprises a connecting rod (301), a first spring (303), a limiting rod (306), a mounting tube (307), an external sleeve (314), a plurality of positioning blocks (319), a support shaft (312), and a positioning rod (309). The connecting rod (301) passes through the mounting sleeve (201) radially along the mounting sleeve (201). The first spring (303) is sleeved on the connecting rod (301) and is fixedly connected to the outer wall of the mounting sleeve (201) and the end of the connecting rod (301). The limiting rod (306) is fixedly arranged on the connecting rod (301) and is located on the movement path of the extrusion block (204). The mounting tube (307) is fixedly arranged on the connecting rod (301). The end portion of the support shaft (312) is fixed on the axis of the installation tube (307), and the two ends are rotatably provided with external sleeves (314), the outer wall of the support shaft (312) is provided with a clamping groove (318), the end portion of the positioning rod (309) is clamped and matched with the inner wall of the clamping groove (318), and the two ends of each positioning block (319) are fixedly connected with the external sleeve (314), and a plurality of mounting holes (315) are provided on the external sleeve (314). When the external sleeve (314) is rotated by an angle, the end portion of the positioning rod (309) can be inserted into the mounting hole (315) on the external sleeve (314), and after passing through the mounting hole (315), it is clamped with the clamping groove (318), so that the positioning block (319) can be fixed, thereby achieving the fixation of the external sleeve (314) and the installation tube (307).

2. The device according to claim 1, characterized in that The clamping assembly (3) further comprises a knob (317), a fixing plate (308), and a second spring (320); wherein The knob (317) is arranged on one of the external sleeves (314), the fixing plate (308) is arranged on the mounting tube (307), the positioning rod (309) passes through the fixing plate (308) and is inserted into one of the mounting holes (315), an end cover (310) is arranged at the end of the positioning rod (309), and the second spring (320) is sleeved on the positioning rod (309) and has two ends fixedly connected to the end cover (310) and the fixing plate (308), respectively.

3. The device according to claim 1, characterized in that The welding assembly (1) further comprises a support plate (107), a hydraulic cylinder (110), an extension pipe (112), a first support plate (114), a second motor (115), a first gear (116), a second support plate (117), and a gas tank (108), wherein The outer wall of the mounting seat (101) is fixedly connected to a support plate (107), the inner wall of the support plate (107) is rotatably connected to an extension tube (112), the outer wall of the extension tube (112) is fixedly connected to a first gear ring (113), the top of the support plate (107) is fixedly connected to a first support plate (114), and the bottom of the first support plate (114) is fixedly connected to a second motor (115). The output end of the second motor (115) is fixedly connected to a first gear (116), the first gear (116) meshes with the first gear ring (113), the outer wall of the extension tube (112) is fixedly connected to a second support plate (117), the top of the second support plate (117) is fixedly connected to a hydraulic cylinder (110), the output end of the hydraulic cylinder (110) passes through the second support plate (117) and is slidably connected thereto, the output end of the hydraulic cylinder (110) is fixedly connected to a welding gun (111), the top of the mounting seat (101) is fixedly connected to a gas tank (108), the exhaust end of the gas tank (108) is fixedly connected to a gas pipe (109), and the welding gun (111) is fixedly connected to the gas pipe (109).

4. The device according to claim 1, characterized in that The welding assembly (1) further comprises: a fixing seat (105), a first motor (106), wherein A fixing seat (105) is fixedly connected to the outer wall of the mounting seat (101), a first motor (106) is fixedly connected to the top of the fixing seat (105), two ends of the bidirectional threaded rod (103) respectively penetrate the mounting seat (101) and extend to the outside thereof, and an output end of the first motor (106) is fixedly connected to an end of the bidirectional threaded rod (103).

5. The device according to claim 1, 2, 3 or 4, characterized in that: Each driving assembly (2) further comprises a second gear ring (203), a support block (205), a mounting plate (206), a third motor (208), and a second gear (209), wherein The second gear ring (203) is fixedly arranged along the circumferential outer wall of the connecting sleeve (202); the outer wall of the mounting sleeve (201) is fixedly connected to a support block (205); the top of the support block (205) is fixedly connected to a mounting plate (206); the bottom of the mounting plate (206) is fixedly connected to a third motor (208); the output end of the third motor (208) is fixedly connected to a connecting shaft (207); the end of the connecting shaft (207) passes through the supporting block (205) and is rotatably connected thereto; two second gears (209) are fixedly connected to the circumferential outer wall of the connecting shaft (207); the second gears (209) are respectively meshed with the second gear ring (203).

6. The device according to claim 1 or 2, characterized in that: The clamping assembly (3) further comprises a mounting ring (305), wherein A mounting ring (305) is fixedly connected to the portion of the connecting rod (301) located inside the mounting sleeve (201), and two limiting rods (306) are fixedly connected to the mounting ring (305).

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