A high-efficiency automatic welding machine and its working method

Abstract

The present invention relates to automatic welding machine technology, which is used to solve the problem that welding machines cannot achieve simultaneous welding of the inside and outside of round tube profiles and the welding accuracy of simple welding machines is poor. Specifically, it relates to a high-efficiency automatic welding machine and a working method thereof, comprising a welding rod station and a walking block, the walking block is located at the top of the round tube, and the welding rod stations are symmetrically arranged on the inside and outside of the round tube; the present invention arranges two groups of symmetrical welding rods above the welding round tube, so that the inside and outside of the round tube are welded simultaneously, preventing the problem of gaps and fractures inside the two welds; at the same time, since the welding rod station can adjust the angle through a push-pull plate, the welding rod is inclined to the round tube to be welded during welding, which can better ensure that the coating on the outside of the welding rod melts evenly, ensures the utilization rate of the welding rod and the uniformity of welding; at the same time, the welding rod control wheel inside the welding rod station can control the welding rod to float up and down, and can adjust the weld width as needed to ensure the air tightness and welding strength of the welding.

Description

Technical Field

[0001] The present invention relates to automatic welding machine technology, in particular to a high-efficiency automatic welding machine and a working method thereof. Background Art

[0002] Welding technology is an operation method of connecting two or more parent materials into a whole using welding materials under high temperature or high pressure conditions. With the continuous improvement of industrial production technology, welding technology requires more efficiency and precision. As welding technology is applied in more and more industries and occupies an increasingly important proportion, people's requirements for welding technology are becoming more and more stringent. Therefore, in order to reduce labor, increase work precision, and increase production efficiency, more and more automatic welding machines are appearing in the welding industry.

[0003] At present, the existing automatic welding machines still have shortcomings. Most automatic welding machines often use a single set of motion mechanisms and clamping mechanisms to control the movement of the welding rod on the parent material. The mechanical arm that can achieve high-precision movement is expensive and complicated to use, which is not conducive to large-scale promotion and use. At the same time, some welding machines with relatively simple structures cannot achieve simultaneous welding of the inside and outside of the round pipe when facing the welding of materials such as round pipes. The temperature difference between the inner and outer welds can easily cause cracking of the weld and reduce the strength, which is not conducive to production.

[0004] In response to the above technical problems, this application proposes a solution. Summary of the Invention

[0005] The invention provides a method for simultaneously welding the inner and outer sides of the circular tube and simultaneously melting and welding the weld seams produced during welding, thereby avoiding the different cooling temperatures caused by the step-by-step welding of the inner and outer weld seams and preventing the problems of gaps and fractures in the two weld seams from occurring, and ensuring that the welding effect of the automatic welding machine is not affected. At the same time, since the welding rod station can adjust the angle through the push-pull plate, the welding rod can be tilted to the circular tube to be welded during welding, which can better ensure that the coating on the outer side of the welding rod melts evenly, and the utilization rate and welding uniformity of the welding rod are guaranteed. At the same time, the welding rod control wheel inside the welding rod station can control the welding rod to float up and down, and the weld seam width can be adjusted as needed to ensure the air tightness and welding strength of the welding. The fume collection window at the bottom can prevent the fume produced during welding from escaping, which is beneficial to the maintenance of the working environment and reduces the harm to the staff. The invention solves the problems that the welding machine cannot realize the simultaneous welding of the inside and outside of the circular tube profile and the simple welding machine has poor welding accuracy and few adjustable parameters, and proposes an efficient automatic welding machine and its working method.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A high-efficiency automatic welding machine comprises a working surface, the working surface being placed on a workbench, a positioning ring being fixedly mounted on the upper surface of the working surface, a round tube to be welded being placed inside the positioning ring, another group of round tubes to be welded being placed above the round tube to be welded, brackets being fixedly connected on both sides of the working surface, a clamping cylinder being fixedly mounted on the top of the bracket, an output rod being fixedly connected to the output end of the clamping cylinder, a clamping plate being fixedly connected to one end of the output rod, and the clamping plate abutting against the joints of the two groups of round tubes to be welded;

[0008] The top edge of the circular pipe to be welded above is movably connected with a walking block, and the lower surface of the walking block is movably connected with a side stabilizing block, and the bottom of the walking block walks above the circular pipe to be welded through walking wheels, and the walking wheels are controlled by a motor, and the side stabilizing blocks are clamped on both sides of the circular pipe to be welded. The upper surface of the walking block is fixedly connected to a support rod, and the top of the support rod is fixedly connected to a cross frame, and push-pull plates are slidably connected to the two sides of the cross frame by a cylinder. The bottom of both sides of the cross frame is rotatably connected to a steering rod, and the outer side of the steering rod is rotatably connected to the bottom of the welding rod station, and the outer side of the push-pull plate is rotatably connected to the top of the welding rod station, and the welding rod station is vertically provided with a welding rod socket, and the inside of the welding rod station is rotatably connected with a welding rod control wheel, and the welding rod control wheel is controlled by an electric control motor, and one side of the welding rod control wheel is located inside the welding rod socket.

[0009] As a preferred embodiment of the present invention, the positioning ring is provided with multiple groups of holes, and a clamping block is slidably connected to the inside of the hole, and a return spring is fixedly connected to the outer end of the clamping block, and the end of the return spring away from the clamping block is fixedly connected to the side wall of the baffle, and the baffle is fixedly installed on the upper surface of the working surface, and a circular ring groove is provided on the upper surface of the working surface, which is located on the outside of the positioning ring, and a control disk is slidably connected inside the circular ring groove, and a handle is fixedly installed on the upper surface of the control disk, and multiple groups of control grooves are provided on the upper surface of the control disk, and a connecting column is fixedly installed on the lower surface of the clamping block, and the connecting column is snap-connected to the inside of the control groove, and the lower surface of the control disk is connected to one end of the torsion spring, and the torsion spring is located between the control disk and the working surface, and the other end of the torsion spring is fixedly connected to the working surface.

[0010] As a preferred embodiment of the present invention, multiple groups of card slots are provided at the bottom of the walking block, and telescopic blocks are slidably connected inside the card slots. The lower surface of the telescopic block is rotatably connected to the steering shaft, and the bottom of the steering shaft is fixedly connected to the upper surface of the side stabilizing block. The telescopic blocks are symmetrically arranged on both sides of the walking block, and the corresponding two groups of telescopic blocks are elastically connected by tension springs.

[0011] As a preferred embodiment of the present invention, support ears are fixedly connected to both sides of the telescopic block, and the support ears are slidably connected to the inside of the walking block through slide rails. The part of the card slot inside the walking block that abuts the steering shaft is an arc-shaped surface.

[0012] As a preferred embodiment of the present invention, the side stabilizing block is rotatably connected to one side of the pipe to be welded, and the side stabilizing wheels are distributed at both ends of the side stabilizing block. An arc-shaped groove is opened in the middle of the side stabilizing block, and the side stabilizing wheels are located on both sides of the arc-shaped groove.

[0013] As a preferred embodiment of the present invention, a smoke collecting window is provided at the center of the positioning ring on the working surface, and a fan is rotatably connected below the smoke collecting window, and the fan is driven by a motor.

[0014] The working method of the high-efficiency automatic welding machine includes the following steps:

[0015] Step 1: Pull the handle and turn the control disk so that the control disk drives the clamping block to expand outward, and place the first set of round tubes to be welded in the positioning ring. Then release the handle so that the control disk returns to its original position under the action of the torsion spring, driving the clamping block to extend into the positioning ring and press against the round tubes to be welded inside the positioning ring.

[0016] Step 2: After the lower group of round tubes to be welded are fixed, another group of round tubes to be welded is placed on top of it. At the same time, the clamping cylinder and the output rod are controlled to extend so that the splint clamps the two groups of round tubes to be welded at the same time. At the same time, the walking block is placed on the top of the round tubes to be welded so that the side stabilizing blocks clamp the round tubes from both the inside and outside of the round tubes, thereby fixing the walking block.

[0017] Step 3: Insert the welding rod into the welding rod socket in the welding rod station, adjust the front end of the welding rod to the joint of the two sets of round pipes to be welded, and at the same time, use the cylinder to drive the push-pull plate to slide and adjust the inclination of the welding rod station so that the welding rod and the round pipe are at an inclination angle that is conducive to welding;

[0018] Step 4: Start welding. The walking wheel under the walking block drives the walking block and the welding rod station to move forward at a constant speed above the round tube, so that welding starts at the same time on both sides of the round tube. At the same time, the welding rod control wheel inside the welding rod station controls the welding rod to shake up and down, making the weld wider. After a certain length of welding, the clamping cylinder and the output rod are retracted, driving the splint to leave the surface of the two groups of round tubes to be welded to prevent the splint and the output rod from blocking the passage of the welding rod. During welding, the fan under the working surface starts to generate suction, and the fume generated by welding inside the round tube is sucked out through the fume collection window.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. In the present invention, two sets of symmetrical welding rods are arranged above the welding round tube, so that the inner and outer sides of the round tube are welded at the same time. The welds produced during welding are melted and welded at the same time, avoiding the different cooling temperatures caused by the step-by-step welding of the inner and outer welds, preventing the problems of gaps and fractures inside the two welds, and ensuring that the welding effect of the automatic welding machine is not affected.

[0021] 2. In the present invention, the welding rod station for clamping two groups of welding rods can control the tilt angle through the cylinder, so that the welding rod is tilted to the round pipe to be welded during welding, which can better ensure that the coating on the outside of the welding rod melts evenly, and ensure the utilization rate of the welding rod and the uniformity of welding. At the same time, the welding rod control wheel inside the welding station can control the up and down floating of the welding rod, and can adjust the weld width as needed to ensure the air tightness and welding strength of the welding.

[0022] 3. In the present invention, the clamping device under the welding round pipe can be adjusted by one button through the handle and the control panel, so that the clamping and positioning work of the welding round pipe is fast and accurate, which speeds up the work efficiency. At the same time, the fume collection window at the bottom can prevent the fume generated during welding from escaping, which is conducive to maintaining the working environment and reducing the harm to the workers. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] To facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0024] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0025] Figure 2 It is a schematic diagram of the structure of the clamping block of the present invention;

[0026] Figure 3 This is a schematic diagram of the control panel structure of the present invention;

[0027] Figure 4 This is a schematic diagram of the smoke collection window structure of the present invention;

[0028] Figure 5 For the present invention Figure 1 A in the middle is an enlarged structural diagram;

[0029] Figure 6 This is a schematic diagram of the side stabilizing wheel structure of the present invention;

[0030] Figure 7 This is a schematic diagram of the welding rod station structure of the present invention;

[0031] Figure 8 It is a schematic diagram of the structure of the tension spring of the present invention;

[0032] Figure 9 It is a schematic structural diagram of the walking block of the present invention.

[0033] In the figure: 1. Working surface; 2. Bracket; 3. Clamping cylinder; 4. Clamping plate; 5. Output rod; 6. Positioning ring; 7. Control panel; 8. Handle; 9. Clamping block; 10. Return spring; 11. Baffle; 12. Smoke collecting window; 13. Connecting column; 14. Control slot; 15. Torsion spring; 16. Fan; 17. Traveling block; 18. Support rod; 19. Cross frame; 20. Rod station; 21. Push-pull plate; 22. Side stabilizing block; 23. Side stabilizing wheel; 24. Telescopic block; 25. Steering shaft; 26. Rod control wheel; 27. Steering rod; 28. Support ear; 29. ​​Tension spring; 30. Traveling wheel. DETAILED DESCRIPTION

[0034] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0035] Example 1:

[0036] See also Figure 1 - Figure 9 As shown, a high-efficiency automatic welding machine includes a working surface 1, which is placed on a workbench, which is placed on the ground or other surfaces. Universal wheels can also be installed under the workbench as needed. A positioning ring 6 is fixedly installed on the upper surface of the working surface 1. The size of the positioning ring 6 is the maximum round pipe size that can be processed by the automatic welding machine. A round pipe to be welded is placed inside the positioning ring 6, and another group of round pipes to be welded is placed above the round pipe to be welded. Brackets 2 are fixedly connected to both sides of the working surface 1, and a clamping cylinder 3 is fixedly installed on the top of the bracket 2. The clamping cylinder 3 is controlled by a control system. The output end of the clamping cylinder 3 is fixedly connected to an output rod 5. One end of the output rod 5 is fixedly connected to a clamping plate 4. The clamping plate 4 is arc-shaped, so that it fits the round tube to be welded better and improves the clamping stability. The clamping plate 4 abuts the joints of the two groups of round tubes to be welded, so that the two groups of round tubes to be welded remain coaxial. When the lower group of round tubes to be welded is fixed, another group of round tubes to be welded is placed on it. At the same time, the clamping cylinder 3 and the output rod 5 are controlled to extend, so that the clamping plate 4 clamps the two groups of round tubes to be welded at the same time.

[0037] The top edge of the circular tube to be welded located above is movably connected with a walking block 17, and a plurality of groups of slots are provided at the bottom of the walking block 17. A telescopic block 24 is slidably connected inside the slot, and support ears 28 are fixedly connected on both sides of the telescopic block 24. The support ears 28 are slidably connected to the inside of the walking block 17 through slide rails. The stability of the telescopic block 24 sliding in the walking block 17 is improved by the support ears 28. The part where the slot inside the walking block 17 abuts against the steering shaft 25 is an arc-shaped surface, so that the steering shaft 25 is more combined with the slot. The steering shaft 25 is rotatably connected to the lower surface of the telescopic block 24, and the bottom of the steering shaft 25 is fixedly connected to the upper surface of the side stabilizing block 22, so that the side stabilizing block 22 can rotate according to the steering shaft 25 to fit circular tubes of different diameters. The telescopic block 24 is symmetrically arranged It is placed on both sides of the walking block 17, and the corresponding two groups of telescopic blocks 24 are elastically connected by tension springs 29. When the thickness of the round tube is different, the side stabilizing block 22 can stretch the tension spring 29, so that the distance between the two groups of side stabilizing blocks 22 is larger, thereby adapting to the different thicknesses of the round tubes to be welded. The lower surface of the walking block 17 is connected with the side stabilizing block 22, and the lower part of the walking block 17 walks above the round tube to be welded through the walking wheel 30. The walking wheel 30 is controlled by the motor and the control system. The walking block 17 is placed on the top of the round tube to be welded, so that the side stabilizing block 22 clamps the round tube from the inside and outside of the round tube, thereby fixing the walking block 17. The side stabilizing blocks 22 are engaged on both sides of the round tube to be welded. The upper surface of the walking block 17 is fixedly connected with the support rod 18 to support The top of the rod 18 is fixedly connected to a cross frame 19, and both sides of the cross frame 19 are in a sunken state. According to the height of the round pipe that needs to be welded, cross frames 19 with different sinking distances can be selected, so that the application range of the welding machine is wider. Push-pull plates 21 are slidably connected to both sides of the cross frame 19 through cylinders, and steering rods 27 are rotatably connected to the bottom of the welding rod station 20 on both sides. The outer side of the steering rod 27 is rotatably connected to the bottom of the welding rod station 20, and the outer side of the push-pull plate 21 is rotatably connected to the top of the welding rod station 20. By moving the push-pull plate 21 left and right, the welding rod station 20 can be rotated, thereby adjusting the angle of the welding rod inserted into the welding rod station 20. When welding, the welding rod used for welding is inserted into the welding rod socket in the welding rod station 20, and the front end of the welding rod is adjusted to the joint of the two groups of round pipes to be welded. At the seam, the push-pull plate 21 is driven to slide by the cylinder, and the inclination angle of the welding rod station 20 is adjusted so that the welding rod and the round pipe are at a welding rod inclination angle that is conducive to welding. The welding rod station 20 is provided with a welding rod socket in the vertical direction, and the welding rod station 20 is internally rotatably connected with a welding rod control wheel 26. The welding rod control wheel 26 is controlled by a motor and a control system. One side of the welding rod control wheel 26 is located inside the welding rod socket, so that the connection between the welding rod control wheel 26 and the welding rod is tighter. The side stabilizing block 22 is rotatably connected to one side of the pipe to be welded, and the side stabilizing wheels 23 are distributed at both ends of the side stabilizing block 22. An arc-shaped groove is provided in the middle of the side stabilizing block 22, and the side stabilizing wheels 23 are located on both sides of the arc-shaped groove, so that the side stabilizing block 22 can slide on the outside of the round pipe through the side stabilizing wheels 23;

[0038] At the beginning, the walking wheel 30 under the walking block 17 drives the walking block 17 and the welding rod station 20 to move forward at a constant speed above the circular tube, so that welding starts at the same time on both sides of the circular tube. At the same time, the welding rod control wheel 26 inside the welding rod station 20 controls the welding rod to shake up and down, making the weld wider. After a certain length of welding, the clamping cylinder 3 and the output rod 5 are retracted, driving the splint 4 to leave the surface of the two groups of circular tubes to be welded, preventing the splint 4 and the output rod 5 from blocking the welding rod from passing. The working surface 1 is located at the center of the positioning ring 6 and is provided with a smoke collection window 12. A fan 16 is rotatably connected below the smoke collection window 12. The fan 16 is driven by a motor. The smoke collection window 12 can prevent the smoke generated during welding from escaping, which is conducive to maintaining the working environment and reducing harm to the staff.

[0039] Example 2:

[0040] See also Figure 1 - Figure 3 As shown, there are multiple groups of holes on the positioning ring 6, and a clamping block 9 is slidably connected inside the hole. The outer end of the clamping block 9 is fixedly connected to a return spring 10, and the end of the return spring 10 away from the clamping block 9 is fixedly connected to the side wall of the baffle 11. The baffle 11 is fixedly installed on the upper surface of the working surface 1. A circular groove is provided on the upper surface of the working surface 1. The circular groove is located on the outside of the positioning ring 6, and a control disk 7 is slidably connected inside the circular groove. A handle 8 is fixedly installed on the upper surface of the control disk 7. Pulling the handle 8 drives the control disk 7 to rotate. The upper surface of the control disk 7 is provided with multiple groups of control grooves 14, which clamp A connecting column 13 is fixedly installed on the lower surface of the block 9, and the connecting column 13 is engaged and connected to the inside of the control groove 14, so that the control disk 7 drives the clamping block 9 to expand outward through the control groove 14. At this time, the first group of round tubes to be welded are placed in the positioning ring 6, and the lower surface of the control disk 7 is connected to one end of the torsion spring 15. The torsion spring 15 is located between the control disk 7 and the working surface 1, and the other end of the torsion spring 15 is fixedly connected to the working surface 1. At this time, the handle 8 is released, so that the control disk 7 is reset under the action of the torsion spring 15, driving the clamping block 9 to extend into the inside of the positioning ring 6, and press against the round tube to be welded located inside the positioning ring 6.

[0041] Combining Example 1 with Example 2:

[0042] In the present invention, two groups of symmetrical welding rods are arranged above the welding circular tube, so that the inner and outer sides of the circular tube are welded at the same time, and the welds generated during welding are melted and welded at the same time, avoiding the different cooling temperatures caused by the step-by-step welding of the inner and outer welds, preventing the generation of gaps and fractures inside the two welds, and ensuring that the welding effect of the automatic welding machine is not affected. At the same time, since the welding rod station 20 can adjust the angle through the push-pull plate 21, the welding rod is inclined to the circular tube to be welded during welding, which can better ensure that the coating on the outside of the welding rod melts evenly, and ensure the utilization rate of the welding rod and the uniformity of welding. At the same time, the welding rod control wheel 26 inside the welding rod station 20 can control the up and down floating of the welding rod, and can adjust the weld width as needed to ensure the air tightness and welding strength of the welding. The smoke collection window 12 at the bottom can prevent the smoke generated during welding from escaping, which is beneficial to the maintenance of the working environment and reduces the harm to the staff.

[0043] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A high-efficiency automatic welding machine, comprising a working surface (1), the working surface (1) being placed on a workbench, characterized in that: A positioning ring (6) is fixedly installed on the upper surface of the working surface (1), a round tube to be welded is placed inside the positioning ring (6), and another group of round tubes to be welded is placed above the round tube to be welded. Brackets (2) are fixedly connected to both sides of the working surface (1), and a clamping cylinder (3) is fixedly installed on the top of the bracket (2). The output end of the clamping cylinder (3) is fixedly connected to an output rod (5), and one end of the output rod (5) is fixedly connected to a clamping plate (4), and the clamping plate (4) abuts against the joints of the two groups of round tubes to be welded; A walking block (17) is movably connected to the top edge of the circular tube to be welded, and a side stabilizing block (22) is movably connected to the lower surface of the walking block (17). The walking block (17) moves above the circular tube to be welded via a walking wheel (30) below. The walking wheel (30) is controlled by a motor. The side stabilizing blocks (22) are engaged with both sides of the circular tube to be welded. The upper surface of the walking block (17) is fixedly connected to a support rod (18). The top of the support rod (18) is fixedly connected to a cross frame (19). Both sides of the cross frame (19) are fixedly connected by a cylinder. A push-pull plate (21) is slidably connected, and the bottom of both sides of the cross frame (19) is rotatably connected to a steering rod (27), the outer side of the steering rod (27) is rotatably connected to the bottom of the welding rod station (20), the outer side of the push-pull plate (21) is rotatably connected to the top of the welding rod station (20), the welding rod station (20) is provided with a welding rod insertion hole in the vertical direction, and the inside of the welding rod station (20) is rotatably connected to a welding rod control wheel (26), the welding rod control wheel (26) is controlled by an electric control motor, and one side of the welding rod control wheel (26) is located inside the welding rod insertion hole; The positioning ring (6) is provided with a plurality of holes, the inside of which is slidably connected to a clamping block (9), the outer end of which is fixedly connected to a return spring (10), the end of which is away from the clamping block (9) is fixedly connected to the side wall of a baffle (11), the baffle (11) is fixedly mounted on the upper surface of the working surface (1), the upper surface of the working surface (1) is provided with a circular groove, the circular groove is located on the outside of the positioning ring (6), and the inside of which is slidably connected to a control disk (7) ), a handle (8) is fixedly mounted on the upper surface of the control disk (7), a plurality of control grooves (14) are provided on the upper surface of the control disk (7), a connecting column (13) is fixedly mounted on the lower surface of the clamping block (9), the connecting column (13) is snap-connected inside the control groove (14), the lower surface of the control disk (7) is connected to one end of a torsion spring (15), the torsion spring (15) is located between the control disk (7) and the working surface (1), and the other end of the torsion spring (15) is fixedly connected to the working surface (1); The bottom of the walking block (17) is provided with a plurality of slots, the slots being slidably connected to telescopic blocks (24), the lower surface of the telescopic blocks (24) being rotatably connected to a steering shaft (25), the bottom of the steering shaft (25) being fixedly connected to the upper surface of the side stabilizing block (22), the telescopic blocks (24) being symmetrically arranged on both sides of the walking block (17), and the two corresponding groups of telescopic blocks (24) being elastically connected via a tension spring (29); Support ears (28) are fixedly connected to both sides of the telescopic block (24), and the support ears (28) are slidably connected to the inside of the walking block (17) through a slide rail. The part of the card slot inside the walking block (17) that abuts against the steering shaft (25) is an arc-shaped surface; The side stabilizing block (22) is rotatably connected to one side of the pipe to be welded and is provided with a side stabilizing wheel (23). The side stabilizing wheels (23) are distributed at both ends of the side stabilizing block (22). An arc-shaped groove is provided in the middle of the side stabilizing block (22), and the side stabilizing wheels (23) are located on both sides of the arc-shaped groove. The working surface (1) is provided with a smoke collection window (12) at the center of the positioning ring (6), and a fan (16) is rotatably connected below the smoke collection window (12), and the fan (16) is driven by a motor.

2. A method for operating a high-efficiency automatic welding machine according to claim 1, characterized in that: The following steps are involved: Step 1: Pull the handle (8) and rotate the control disk (7) so that the control disk (7) drives the clamping block (9) to expand outward, and the first group of round tubes to be welded are placed in the positioning ring (6), and then release the handle (8) so that the control disk (7) is reset under the action of the torsion spring (15), and the clamping block (9) is driven to extend into the interior of the positioning ring (6), and press against the round tubes to be welded located inside the positioning ring (6); Step 2: After the lower group of round tubes to be welded is fixed, another group of round tubes to be welded is placed on top of the lower group of round tubes to be welded, and at the same time, the clamping cylinder (3) and the output rod (5) are controlled to extend so that the clamping plate (4) clamps the two groups of round tubes to be welded at the same time, and at the same time, the walking block (17) is placed on the top of the round tubes to be welded so that the side stabilizing block (22) clamps the round tubes from the inside and outside of the round tubes, thereby fixing the walking block (17); Step 3: Insert the welding rod into the welding rod insertion hole in the welding rod station (20), adjust the front end of the welding rod to the joint of the two sets of round tubes to be welded, and at the same time drive the push-pull plate (21) to slide by the cylinder to adjust the inclination angle of the welding rod station (20) so that the welding rod and the round tube are at a welding rod inclination angle that is conducive to welding; Step 4: Start welding. The walking wheel (30) below the walking block (17) drives the walking block (17) and the welding rod station (20) to move forward at a constant speed above the round tube, so that the inner and outer sides of the round tube start welding at the same time. At the same time, the welding rod control wheel (26) inside the welding rod station (20) controls the welding rod to shake up and down, making the weld wider. After welding for a certain length, the clamping cylinder (3) and the output rod (5) are retracted, driving the clamping plate (4) to leave the surface of the two groups of round tubes to be welded, preventing the clamping plate (4) and the output rod (5) from blocking the welding rod from passing. During welding, the fan (16) below the working surface (1) starts to generate suction, and the smoke generated by welding inside the round tube is sucked out through the smoke collection window (12).

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