A laser welding device for heating tubes

Abstract

This invention discloses a laser welding device for heating tubes, relating to the field of laser welding technology. The invention includes a base with two symmetrically fixed rotating seats, each rotatably connected to a rotating sleeve. It also includes a pre-charge protection component, comprising a connecting plate fixedly connected to one of the rotating sleeves. A bidirectional lead screw is rotatably connected through the side of the connecting plate, and two sliders are symmetrically threaded onto the bidirectional lead screw. Isolation tubes are fixedly connected to the sides of the sliders, and plug plates are fixedly connected to the periphery of the isolation tubes. Ear rods are fixedly connected to the side of the connecting plate. During use, the two isolation tubes approach each other until they abut against the ring sleeve. As the isolation tubes move, they push the gas in the gas chamber into the gas bag, causing the gas bag to expand, thus forming a chamber between the two heat exchange tubes. Inert gas is then filled into the chamber to complete the overall pre-charge. Compared to continuously inputting inert gas, this method is more economical and efficient.

Description

Technical Field

[0001] This invention relates to the field of laser welding technology, and in particular to a laser welding device for heating tubes. Background Technology

[0002] Laser welding of heating tubes is a process that uses a high-energy laser beam as a heat source to precisely weld stainless steel heating tubes. It enables highly automated, deep-penetration welding with a minimal heat-affected zone, ensuring excellent weld sealing, high strength, and a smooth, flat appearance. It is a key technology for manufacturing reliable and durable heating tubes.

[0003] When laser welding pipes, the inner wall of the pipe (the back of the weld) is exposed to high temperature. If it is not protected, an oxidation reaction will occur. In order to avoid the oxidation reaction of the inner wall of the pipe and affect the quality of the finished pipe, the existing technology usually continuously introduces inert gas into the pipe and keeps the flow rate of the inert gas in the pipe stable, thereby isolating the oxygen in the inner wall of the pipe and improving the laser welding quality of the heating tube.

[0004] However, in actual use, stopping the input of inert gas will cause air backflow. In order to prevent the inner wall of the pipe from being affected by the oxidation reaction, it is necessary to continuously release inert gas into the pipe. The loss of inert gas during the welding process is too great, and the protection cost of the pipe during welding is too high. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies, such as excessive losses due to continuous input of inert gas and high protection costs for pipeline welding, and to propose a laser welding device for heating tubes.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] Design a laser welding device for heating tubes, including a base with two symmetrically fixed rotating seats, each rotating seat having a rotating sleeve rotatably connected to it. The device also includes a pre-charge protection component, comprising a connecting plate fixedly connected to one of the rotating sleeves. A bidirectional lead screw is rotatably connected through the side of the connecting plate, with two sliders symmetrically threaded onto the bidirectional lead screw. An isolation tube is fixedly connected to the side of each slider, and a stopper plate is fixedly connected to the periphery of the isolation tube. An ear rod is fixedly connected to the side of the connecting plate, and an isolation frame is fixedly connected to the side of the ear rod. Gas chambers are symmetrically fixedly connected to two opposite sides of the isolation frame, with an air bladder communicating with the periphery of each gas chamber. A connecting tube is also communicating with the side of the gas chamber, and a piston chamber is communicating with the end of the connecting tube. A laser welding machine is fixedly connected to the surface of the base.

[0008] Preferably, the piston plate is slidably engaged with the piston chamber, the isolation tube is slidably connected to the piston chamber, an air inlet pipe is connected to the side of one of the air chambers, the air inlet pipe is open at both ends, a first one-way valve is provided on the air inlet pipe, two slide rods are symmetrically slidably connected to the side of the other air chamber, a pressure relief plate is fixedly connected between the two slide rods, a stop block is fixedly connected to the end of the slide rod, and a spring is fixedly connected between the stop block and the corresponding air chamber.

[0009] Preferably, the isolation frame is provided with a partial supplementation component, which includes a fixed frame fixedly connected to the isolation frame. A gas storage box is fixedly connected inside the fixed frame. A ring plate is slidably connected inside the gas storage box. An inflation nozzle is connected to the side of the ring plate. A second one-way valve is provided on the inflation nozzle. A plurality of first branch pipes are evenly connected to the periphery of the gas storage box. A third one-way valve is provided on the first branch pipe. A piston barrel is connected to the end of the first branch pipe. A second branch pipe is connected to the side of the piston barrel. A fourth one-way valve is provided on the second branch pipe. A pusher plate is slidably connected inside the piston barrel. A round rod is fixedly connected to the side of the pusher plate. A guide ball is fixedly connected to the end of the round rod. A partial supplementation component is provided between all the guide balls.

[0010] Preferably, the partial supplementary component includes an indicator plate, which is rotatably coupled with a bidirectional lead screw. An auxiliary rod is fixedly connected to the side of the indicator plate, and a non-circular ring rail is fixedly connected to the end of the auxiliary rod. A ring sleeve is fixedly connected to the auxiliary rod.

[0011] Preferably, the irregular ring rail includes a pushing part, an air intake part, and a smoothing part. Each guide ball is slidably connected to the irregular ring rail. The pushing part is located directly above the air storage box, the air intake part is located on the side of the pushing part, and the remaining part of the irregular ring rail is the smoothing part.

[0012] Preferably, the indicator plate is triangular pyramidal in shape, a rod is slidably connected to the side of the indicator plate, an extension plate is fixedly connected to the side of the base, and an insertion hole is provided in the extension plate, with the rod and the insertion hole being inserted into each other.

[0013] Preferably, the base is provided with a dual-tube rotating assembly, which includes a drive frame, the drive frame is fixedly connected to the base, a servo motor is fixedly connected to the side of the drive frame, a rotating shaft is rotatably connected through the drive frame, the output end of the servo motor is fixedly connected to the rotating shaft, and two gears are symmetrically fixedly connected to the circumferential side of the rotating shaft.

[0014] Preferably, a toothed ring is fixedly connected to the circumferential side of the rotating sleeve, and the toothed ring meshes with its corresponding gear.

[0015] Preferably, the insulating tube abuts against the ring sleeve.

[0016] The laser welding equipment for heating tubes proposed in this invention has the following advantages:

[0017] This invention involves pulling two isolation tubes toward the center of the welding position. During the movement of the isolation tubes, the plug plate moves in the piston chamber, allowing air from the gas chamber to be introduced into the gas bag. This creates a sealed cavity in the pipe directly below the welding position. Inert gas is then introduced into the cavity, thus achieving static anti-oxidation protection of the inner wall of the pipe in the welding area. This reduces production costs compared to continuous gas input.

[0018] This invention uses a guide ball that follows the rotation of the heat exchange tube. When the guide ball moves along the gas-push section of the irregular ring track, it can spray the inert gas in the gas storage box toward the inner wall of the pipe. Since the gas-push section is always located directly below the laser welding machine, it can continuously spray inert gas toward the welding position. The sprayed inert gas forms a "gas shield" to continuously resist the oxygen flow that enters the inner wall of the pipe under the influence of high temperature, thereby improving the oxidation resistance of the equipment and improving the forming quality of the heating tube after welding. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a laser welding device for heating tubes.

[0020] Figure 2 This is a schematic diagram of the right-side structure of the present invention.

[0021] Figure 3 This is an assembly diagram of the gear and gear ring of the present invention.

[0022] Figure 4 This is a schematic cross-sectional view of the isolation tube and air chamber of the present invention.

[0023] Figure 5 This is a schematic cross-sectional view of the piston chamber and plug plate of the present invention.

[0024] Figure 6 This is an assembly diagram of the air intake pipe and air chamber of the present invention.

[0025] Figure 7 This is an assembly diagram of the isolation frame and air chamber of the present invention.

[0026] Figure 8 This is a schematic diagram of the gas storage box structure of the present invention.

[0027] Figure 9 This is a schematic cross-sectional view of the gas storage box of the present invention.

[0028] Figure 10 for Figure 9 Enlarged view of part A in the image.

[0029] Figure 11 This is a schematic diagram of the cross-sectional structure of the two isolation tubes of the present invention.

[0030] Figure 12 This is an assembly diagram of the auxiliary rod and the irregular ring rail of the present invention.

[0031] Figure 13 This is an assembly diagram of the indicator plate and the insertion rod of the present invention;

[0032] Figure 14 This is a schematic diagram of the irregular ring track structure of the present invention.

[0033] The attached diagram lists the components represented by each number as follows:

[0034] 1. Base; 2. Rotating seat; 3. Rotating sleeve; 4. Connecting plate; 5. Two-way lead screw; 6. Slider; 7. Isolation tube; 8. Plug plate; 9. Ear rod; 10. Isolation frame; 11. Air chamber; 12. Air bag; 13. Connecting tube; 14. Piston chamber; 15. Indicator plate; 16. Auxiliary rod; 17. Ring sleeve; 18. Irregular ring rail; 181. Pushing part; 182. Inhalation part; 183. Smoothing part; 19. Fixing frame; 20. Air storage box; 21. Ring plate; 22. Inflation nozzle; 23. Second one-way valve; 24. First branch pipe; 25. Third check valve; 26. Piston barrel; 27. Second branch pipe; 28. Fourth check valve; 29. ​​Push plate; 30. Round rod; 31. Guide ball; 32. Insert rod; 33. Extension plate; 34. Insertion hole; 35. Gear ring; 36. Drive frame; 37. Rotating shaft; 38. Servo motor; 39. Gear; 40. Heating tube body; 41. Inlet pipe; 42. First check valve; 43. Slide rod; 44. Pressure relief plate; 45. Stop block; 46. Spring; 47. Laser welding machine. Detailed Implementation

[0035] 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.

[0036] Example 1

[0037] Reference Figure 1-14This invention relates to a laser welding device for heating tubes, comprising a base 1, on which two rotating seats 2 are symmetrically fixedly connected, and rotating sleeves 3 are rotatably connected to the rotating seats 2. It also includes a pre-charge protection assembly, comprising a connecting plate 4, which is fixedly connected to one of the rotating sleeves 3. A bidirectional lead screw 5 is rotatably connected through the side of the connecting plate 4, and a drive motor is fixedly connected to the side of the connecting plate 4. The output end of the drive motor is fixedly connected to the bidirectional lead screw 5. Two sliders 6 are symmetrically threaded onto the bidirectional lead screw 5, and the sides of the sliders 6 are fixedly connected to… There is an isolation tube 7, a stopper plate 8 is fixedly connected to the periphery of the isolation tube 7, an ear rod 9 is fixedly connected to the side of the connecting plate 4, an isolation frame 10 is fixedly connected to the side of the ear rod 9, an air chamber 11 is symmetrically fixedly connected to the two opposite sides of the isolation frame 10, an air bag 12 is connected to the periphery of the air chamber 11, a connecting tube 13 is connected to the side of the air chamber 11, a piston chamber 14 is connected to the end of the connecting tube 13, the stopper plate 8 and the piston chamber 14 are slidably engaged, the isolation tube 7 and the piston chamber 14 are slidably connected, and a laser welding machine 47 is fixedly connected to the surface of the base 1.

[0038] The operation process of this embodiment is as follows: When welding the heating tubes, the two heating tube bodies 40 are passed through the rotating sleeve 3, and the tube openings are positioned directly below the laser welding machine 47. The drive motor drives the bidirectional lead screw 5 to rotate. Since the isolation tube 7 is fixed to the slider 6, the isolation tube 7 is slidably connected to the piston chamber 14. At this time, the rotational force of the bidirectional lead screw 5 drives the two isolation tubes 7 to move towards the center position of the tube opening until the two isolation tubes 7 come into contact. During the movement of the isolation tubes 7, the stop plate 8 moves synchronously with them. Both stop plates 8 move towards the center position of the tube opening in their corresponding piston chambers 14. The movement of the stop plate 8 compresses the air in the piston chamber 14. The air enters the air chamber 11 from the piston chamber 14 through the connecting pipe 13, and then enters the air bag 12 from the air chamber 11. In the initial state, the airbag 12 is flat and not in contact with the heating tube body 40. At this time, gas enters the airbag 12 and fills it, causing the airbag 12 to inflate and fill the gap between the gas chamber 11 and the heating tube body 40. When the two isolation tubes 7 come into contact, the airbag 12 is fully inflated. At this time, the isolation tubes 7, piston chamber 14, gas chamber 11, and airbag 12 together form a sealed chamber inside the heating tube body 40. Inert gas is filled into this chamber, and the laser welding machine 47 is started and the two heating tube bodies 40 are rotated synchronously and uniformly to complete the welding operation of the heating tube. This process can also protect the inside of the heating tube body 40 and greatly reduce the use of inert gas during the welding process, thus reducing production costs.

[0039] Example 2

[0040] When filling the space between the heating tube body 40 and the insulating tube 7 with gas, it is necessary to replace the residual air and inert gas. For this purpose, please refer to [link / reference needed]. Figure 1-6Based on the first specific embodiment, an air inlet pipe 41 is connected to the side of one air chamber 11. The air inlet pipe 41 is open at both ends and a first one-way valve 42 is provided on the air inlet pipe 41. Two slide rods 43 are symmetrically slidably connected to the side of the other air chamber 11. A pressure relief plate 44 is fixedly connected between the two slide rods 43. A stop block 45 is fixedly connected to the end of the slide rod 43. A spring 46 is fixedly connected between the stop block 45 and the corresponding air chamber 11.

[0041] The operation process in this embodiment is as follows: Figure 6 As shown, the inert gas pipeline is connected to the inlet pipe 41. After the valve is opened, the inert gas continuously enters the sealed chamber through the inlet pipe 41. The first one-way valve 42 is set to only allow gas to enter the inlet pipe 41, which can prevent the inert gas from flowing back. In the initial state, the spring 46 pulls the pressure relief plate 44 to press against the gas chamber 11. At this time, the gas pressure in the sealed chamber increases. When the gas pressure in the sealed chamber reaches a certain value, the gas pushes the pressure relief plate 44 to move outward and is discharged from the corresponding hole position of the pressure relief plate 44. Continuously introducing inert gas into the inlet pipe 41 can discharge the internal air, so that the sealed chamber is filled with inert gas. No additional inert gas is required during the welding process. The inert gas in the sealed chamber can prevent the inner wall of the heating tube body 40 from oxidizing due to high temperature, thereby improving the protection capability of the heating tube body 40 wall and improving the quality of the finished product.

[0042] Example 3

[0043] A sealed chamber is formed between the two heating tube bodies 40, and inert gas is pre-filled into it. Although pre-filling inert gas can reduce the overall oxygen concentration in the pipe, during the welding process, the molten pool at the welding point is at a high temperature, which can easily attract external oxygen from the gap between the two heating tube bodies 40 and backflow into the chamber. Some oxygen comes into contact with the inner wall of the pipe, thus causing an oxidation reaction and affecting the quality of the finished product.

[0044] Please see Figure 4-13Based on the first specific embodiment, a partial supplementary component is provided inside the isolation frame 10. The partial supplementary component includes a fixed frame 19, which is fixedly connected to the isolation frame 10. A gas storage box 20 is fixedly connected inside the fixed frame 19. A ring plate 21 is slidably connected inside the gas storage box 20. An inflation nozzle 22 is connected to the side of the ring plate 21. A second one-way valve 23 is provided on the inflation nozzle 22. Several first branch pipes 24 are evenly connected to the periphery of the gas storage box 20. A third one-way valve 25 is provided on the first branch pipe 24. A piston barrel 26 is connected to the end of the first branch pipe 24. A second branch pipe 27 is connected to the side of the piston barrel 26. A fourth one-way valve 28 is provided on the second branch pipe 27. A push plate 29 is slidably connected inside the piston barrel 26. A round rod 30 is fixedly connected to the side of the push plate 29. A guide ball 31 is fixedly connected to the end of the round rod 30. A partial supplementary component is provided between all the guide balls 31.

[0045] The supplementary component includes an indicator plate 15, which is rotatably engaged with a bidirectional lead screw 5. An auxiliary rod 16 is fixedly connected to the side of the indicator plate 15, and a shaped ring rail 18 is fixedly connected to the end of the auxiliary rod 16. A ring sleeve 17 is fixedly connected to the auxiliary rod 16. The shaped ring rail 18 includes a pushing part 181, an air intake part 182, and a smoothing part 183. Each guide ball 31 is slidably connected to the shaped ring rail 18. The pushing part 181 is located directly above the air storage box 20, the air intake part 182 is located on the side of the pushing part 181, and the remaining part of the shaped ring rail 18 is the smoothing part 183.

[0046] The operation process of this embodiment is as follows: Since the guide ball 31 is always in sliding fit with the irregular ring rail 18, before the laser welding operation, the air pusher 181 of the irregular ring rail 18 is placed directly below the laser welding machine 47. The air pusher 181 is always located at the welding position of the heating tube body 40 and remains stationary. The gas storage box 20 is pre-filled with inert gas. During the welding process, the two heating tube bodies 40 and the rotating sleeve 3 rotate at a constant speed along the rotating seat 2. The laser welding machine 47 welds the connection part of the heating tube body 40.

[0047] As the heating tube body 40 rotates, the rotational force causes the fixing frame 19 and the gas storage box 20 to rotate synchronously, such as Figure 8 As shown, during the rotation of the gas storage box 20, when the guide ball 31 moves within the air intake section 182, the corresponding push plate 29 gradually moves away from the piston barrel 26. When the guide ball 31 moves within the air intake section 181, the corresponding push plate 29 moves towards the piston barrel 26. The third one-way valve 25 is configured to allow gas to enter the first branch pipe 24 only from the gas storage box 20, the fourth one-way valve 28 is configured to allow gas to enter the second branch pipe 27 only from the piston barrel 26, and the second one-way valve 23 is configured to allow gas to enter only the gas storage box 20.

[0048] Since the gas-pushing section 181 is always located directly below the laser welding machine 47, during the rotary laser welding process, each piston barrel 26 draws some inert gas from the gas storage box 20 when passing the gas intake section 182. The piston barrels 26 passing the welding area are all located inside the gas-pushing section 181, and the inert gas in the piston barrels 26 is sprayed towards the high-temperature molten pool of the heating tube body 40 that has just been welded. The high-temperature molten pool formed during the welding process will generate a negative pressure siphon effect, and external oxygen can easily flow back into the pipe through the gap between the two heating tube bodies 40. Since the irregular ring rail 18 remains stationary during use and is always located directly below the laser welding machine 47, the gas storage box 20 will rotate with the rotation of the heating tube body 40 during rotary welding. During the welding process, the guide ball 31 will pass through the gas-pushing section 181 in sequence, that is, during rotary welding, it can continuously spray inert gas towards the welding position of the heating tube body 40, and the sprayed inert gas forms a "gas shield". It continuously combats the oxygen flow that enters the inner wall of the pipe due to high temperature. Through global and local targeted inert gas protection, it can improve the oxidation resistance of the inner wall of the pipe during welding, thereby improving the quality of the heated pipe after welding.

[0049] Example 4

[0050] During use, the irregularly shaped ring rail 18 needs to be kept in a fixed position. When the heating tube body 40 is inserted into the rotating sleeve 3, it will be blocked by the auxiliary rod 16. For this reason, please refer to... Figure 1-14 Based on the first specific embodiment, the indicator plate 15 is triangular pyramidal in shape. A rod 32 is slidably connected to the side of the indicator plate 15. An extension plate 33 is fixedly connected to the side of the base 1. An insertion hole 34 is opened in the extension plate 33. The rod 32 and the insertion hole 34 are inserted and engaged. A double-tube rotating assembly is provided on the base 1. The double-tube rotating assembly includes a drive frame 36. The drive frame 36 is fixedly connected to the base 1. A servo motor 38 is fixedly connected to the side of the drive frame 36. A rotating shaft 37 is rotatably connected through the drive frame 36. The output end of the servo motor 38 is fixedly connected to the rotating shaft 37. Two gears 39 are symmetrically fixedly connected to the circumference of the rotating shaft 37. A gear ring 35 is fixedly connected to the circumference of the rotating sleeve 3. The gear ring 35 meshes with its corresponding gear 39. The isolation tube 7 abuts against the ring 17.

[0051] The operation process of this embodiment is as follows: When inserting the heating tube body 40, the insertion rod 32 is pulled out from the insertion hole 34. After inserting and adjusting the heating tube body 40, the indicator plate 15 is rotated. When the indicator plate 15 is vertically upward, the air pusher 181 of the irregular ring rail 18 is located directly below the laser welding machine 47. At this time, the servo motor 38 drives the rotating shaft 37 to rotate. The rotational force drives the gear 39 to rotate. Since the gear 39 and the gear ring 35 mesh with each other, and the gear ring 35 is fixedly connected to the rotating sleeve 3, the heating tube body 40 in the two rotating sleeves 3 can be driven to rotate synchronously and uniformly, thereby further improving the welding quality.

[0052] After welding the area, pull out the insert rod 32 upwards again and rotate the double-acting screw 5 in the opposite direction. The two sliders 6 move away from each other, and the airbag 12 returns to its deflated state. Then the heating tube under the rotating sleeve 3 can be removed. The rubber ring inside the rotating sleeve 3 maintains an interference fit with the heating tube body 40. During the welding process, the two heating tubes always keep in contact with each other and rotate synchronously, which can further improve the forming quality of the heating tube after welding.

[0053] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A laser welding device for heating tubes, comprising a base (1), wherein two rotating seats (2) are symmetrically fixedly connected to the base (1), and a rotating sleeve (3) is rotatably connected to the rotating seats (2), characterized in that: It also includes a pre-charge protection component, which includes a connecting plate (4), which is fixedly connected to a rotating sleeve (3). A bidirectional lead screw (5) is rotatably connected through the side of the connecting plate (4). Two sliders (6) are symmetrically threaded on the bidirectional lead screw (5). An isolation tube (7) is fixedly connected to the side of the slider (6). A plug plate (8) is fixedly connected to the periphery of the isolation tube (7). An ear rod (9) is fixedly connected to the side of the connecting plate (4). An isolation frame (10) is fixedly connected to the side of the ear rod (9). An air chamber (11) is symmetrically fixedly connected to the two opposite sides of the isolation frame (10). An air bladder (12) is connected to the periphery of the air chamber (11). A connecting pipe (13) is connected to the side of the air chamber (11). A piston chamber (14) is connected to the end of the connecting pipe (13). A laser welding machine (47) is fixedly connected to the surface of the base (1). The stopper plate (8) is slidably engaged with the piston chamber (14), and the isolation tube (7) is slidably connected to the piston chamber (14). An air inlet pipe (41) is connected to the side of one of the air chambers (11). The air inlet pipe (41) is open at both ends. A first one-way valve (42) is provided on the air inlet pipe (41). Two slide rods (43) are symmetrically slidably connected to the side of the other air chamber (11). A pressure relief plate (44) is fixedly connected between the two slide rods (43). A stop block (45) is fixedly connected to the end of the slide rod (43). A spring (46) is fixedly connected between the stop block (45) and the corresponding air chamber (11).

2. The laser welding equipment for heating tubes according to claim 1, characterized in that, The isolation frame (10) is provided with a local supplementary component, which includes a fixed frame (19). The fixed frame (19) is fixedly connected to the isolation frame (10). A gas storage box (20) is fixedly connected inside the fixed frame (19). A ring plate (21) is slidably connected inside the gas storage box (20). An inflation nozzle (22) is provided on the side of the ring plate (21). A second one-way valve (23) is provided on the inflation nozzle (22). Several first branch pipes (24) are evenly connected on the periphery of the gas storage box (20). A third one-way valve (25) is provided on the first branch pipe (24). A piston barrel (26) is connected to the end of the first branch pipe (24). A second branch pipe (27) is connected to the side of the piston barrel (26). A fourth one-way valve (28) is provided on the second branch pipe (27). A thrust plate (29) is slidably connected inside the piston barrel (26). A round rod (30) is fixedly connected to the side of the thrust plate (29). A guide ball (31) is fixedly connected to the end of the round rod (30). A partial supplementary component is provided between all the guide balls (31).

3. The laser welding equipment for heating tubes according to claim 2, characterized in that, The partial supplementary component includes an indicator plate (15), which is rotatably engaged with a bidirectional lead screw (5). An auxiliary rod (16) is fixedly connected to the side of the indicator plate (15), and a non-circular ring rail (18) is fixedly connected to the end of the auxiliary rod (16). A ring sleeve (17) is fixedly connected to the auxiliary rod (16).

4. The laser welding equipment for heating tubes according to claim 3, characterized in that, The irregular ring track (18) includes a pushing part (181), an air intake part (182), and a smoothing part (183). Each guide ball (31) is slidably connected to the irregular ring track (18). The pushing part (181) is located directly above the air storage box (20), the air intake part (182) is located on the side of the pushing part (181), and the rest of the irregular ring track (18) is the smoothing part (183).

5. The laser welding equipment for heating tubes according to claim 4, characterized in that, The indicator plate (15) is triangular pyramid in shape. A rod (32) is slidably connected to the side of the indicator plate (15). An extension plate (33) is fixedly connected to the side of the base (1). An insertion hole (34) is provided in the extension plate (33). The rod (32) and the insertion hole (34) are inserted into each other.

6. The laser welding equipment for heating tubes according to claim 1, characterized in that, The base (1) is provided with a double-tube rotating assembly, which includes a drive frame (36). The drive frame (36) is fixedly connected to the base (1). A servo motor (38) is fixedly connected to the side of the drive frame (36). A rotating shaft (37) is rotatably connected through the drive frame (36). The output end of the servo motor (38) is fixedly connected to the rotating shaft (37). Two gears (39) are symmetrically fixedly connected to the circumferential side of the rotating shaft (37).

7. The laser welding equipment for heating tubes according to claim 6, characterized in that, A toothed ring (35) is fixedly connected to the circumferential side of the rotating sleeve (3), and the toothed ring (35) meshes with its corresponding gear (39).

8. The laser welding equipment for heating tubes according to claim 1, characterized in that, The isolation tube (7) abuts against the ring (17).

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