Method and equipment for welding inner wall of small-caliber pipe

Abstract

The invention provides a small-caliber pipe inner wall welding method and welding equipment, and belongs to the technical field of pipeline welding, the small-caliber pipe inner wall welding equipment comprises a base, a control seat is arranged in the center of the base, the control seat is rotationally connected with a rotating disc, and clamping discs used for clamping are arranged on the two sides of the rotating disc; the base is provided with multiple sets of moving grooves arranged on the two sides of the control base in a mirroring mode, the operation assembly is arranged on the base and matched with the rotating disc, the operation assembly comprises two sets of moving bases arranged on the two sides of the rotating disc in a mirroring mode, and first electric telescopic rods are arranged in the two sets of moving bases; through cooperation of the operation assembly, the swing assembly and the switching assembly, the problems that when an original small-caliber pipeline is welded, generally, a hand-held welding gun is manually held for operation, so that operation is limited, a welding connector is prone to being uneven, and the error rate is high are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline welding, and particularly relates to a welding method and a welding device for the inner wall of a small-diameter pipe. Background Art

[0002] A steel pipe is a steel product with a hollow cross-section, and its length is much greater than the diameter or circumference. It is divided into circular, square, rectangular, and special-shaped steel pipes according to the cross-sectional shape, carbon structural steel pipes, low-alloy structural steel pipes, alloy steel pipes, and composite steel pipes according to the material, and steel pipes for conveying pipelines, engineering structures, thermal equipment, petrochemical industries, machinery manufacturing, geological drilling, high-pressure equipment, etc. according to the use, and seamless steel pipes and welded steel pipes according to the production process, among which seamless steel pipes are further divided into hot-rolled and cold-rolled (drawn) types.

[0003] Currently, pipeline welding is divided into external pipeline welding and internal pipeline welding. When welding a pipeline with a relatively large diameter and needing to weld inside the inner wall, workers generally climb into the pipeline and set up a welding crawler inside for welding. However, when welding a small-diameter pipeline, it is generally manually operated with a hand-held welding torch, which limits the operation, easily leads to uneven welding joints, and has a high error rate. For this reason, we propose a welding method and a welding device for the inner wall of a small-diameter pipe. Summary of the Invention

[0004] Aiming at the deficiencies in the prior art, the present invention provides a welding method and a welding device for the inner wall of a small-diameter pipe. Through the cooperation of an operation component, a swing component, and a switching component, the problem that when welding a small-diameter pipeline, it is generally manually operated with a hand-held welding torch, which limits the operation, easily leads to uneven welding joints, and has a high error rate is solved.

[0005] In order to solve the above technical problems, the present invention solves the problems generated by manual welding on the inner wall of a small-diameter pipeline through the following technical solutions.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A welding method for the inner wall of a small-diameter pipe includes the following steps:

[0008] S1. Use tools such as an angle grinder, a file, sandpaper, and a wire brush to clean the oil, moisture, oxides, burrs, and rust in the two groups of pipes to be welded until metallic luster appears;

[0009] S2. Fix the pipes after cleaning respectively and make the ends of the two groups of pipes butt-joint;

[0010] S3. Control the welding equipment to operate, weld the two groups of small-diameter pipes, and control the welding temperature during the welding process to avoid deformation or cracks in the stainless steel lining of the steel pipe caused by excessive temperature;

[0011] S4. After welding, post-treatment of the welded joint is required, such as cleaning, grinding, etc., to avoid leaving welding slag and other impurities that affect the use effect; S5. Release the fixation of the welded pipe and remove it, and then check whether the welded joint meets the requirements and whether there is oxidation and contamination.

[0012] A welding equipment for the inner wall of a small-diameter pipe, comprising: a base, a control seat is arranged in the center of the base, the control seat is rotatably connected with a turntable, clamping disks for clamping are arranged on both sides of the turntable, and a plurality of groups of moving grooves are arranged on the base and are mirror-symmetrically arranged on both sides of the control seat; an operation component, the operation component is arranged on the base and cooperates with the turntable, and it includes two moving seats that are mirror-symmetrically arranged on both sides of the turntable. A first electric telescopic rod is arranged in both of the two moving seats, and the top end of the first electric telescopic rod is fixedly connected with a lifting seat located above the moving seat. The operation component is used for welding and grinding operations on the two groups of pipes; a swinging component, the swinging component is arranged on the moving seat and is connected with the operation component, and it is used to drive the welding head to swing back and forth at the welding position during welding, so as to improve the welding uniformity; a switching component, the switching component is arranged on the base and cooperates with the operation component and the swinging component, and it is used for switching to drive the operation component and the swinging component to operate respectively.

[0013] Preferably, the operation component further includes second electric telescopic rods that are mirror-symmetrically arranged and whose output ends face the turntable. The second electric telescopic rods are fixedly connected with a mounting frame that is fixedly connected with the lifting seat. A welding torch is slidably connected to one of the mounting frames, and the end of the welding torch is fixedly connected with the output end of the corresponding second electric telescopic rod. A grinding rod is arranged on the other mounting frame, and the end of the grinding rod is fixedly connected with the output end of the corresponding second electric telescopic rod. A moving mechanism for driving the two moving seats to move is arranged in the base.

[0014] Preferably, the moving mechanism includes a threaded rod arranged in the base and rotatably connected to it. A moving box that is threadedly connected to the threaded rod is slidably connected to the moving seat below the welding torch. The moving box is slidably connected to the moving groove. A moving table that is threadedly connected to the threaded rod is fixedly connected to the moving seat below the grinding rod. The moving table is slidably connected to the moving groove.

[0015] Preferably, the swing assembly includes a connection block disposed inside the moving box and slidably connected thereto. The connection block is fixedly connected to the moving seat in contact therewith. A plurality of fixed rods slidably connected to the moving seat and the moving block are fixedly connected inside the moving box. First springs sleeved on the fixed rods are disposed on both sides of the moving seat and the moving block. A reciprocating rod fixedly connected to one end of the moving block is provided. The other end of the reciprocating rod is located outside the moving box and is provided with a sphere. A moving plate fixedly connected to the outside of the moving box is disposed below the sphere. A driving mechanism connected to the control seat is provided on the moving plate.

[0016] Preferably, the driving mechanism includes a rotating block disposed on the moving plate. An eccentric shaft rotatably connected to the moving plate is fixedly connected to the rotating block near the arc edge. A first bevel gear is fixedly connected to the eccentric shaft. A bent block is rotatably connected to the eccentric shaft. A second bevel gear meshingly connected to the first bevel gear is rotatably connected to the bent block. A rectangular rod rotatably connected to the control seat is slidably connected to the second bevel gear. One end of the rectangular rod away from the control seat is tapered. A connection ring rotatably connected to the bent block is slidably connected to the rectangular rod.

[0017] Preferably, the switching assembly includes a fixed frame disposed at the end of the base and fixedly connected thereto. The fixed frame is rotatably connected to the threaded rod. A sliding plate is slidably connected to the fixed frame. A first docking shaft is rotatably connected to the connection frame. A first rectangular groove is formed in the first docking shaft. A second docking shaft is rotatably connected to the top end of the sliding plate. A second rectangular groove adapted to the rectangular rod is formed in the second docking shaft. A first gear is fixedly connected to the first docking shaft. A second gear fixedly connected to the threaded rod is meshingly connected to the first gear. A third gear is rotatably connected to the sliding plate. A fourth gear fixedly connected to the second docking shaft is meshingly connected to the third gear. An adjusting mechanism disposed on the base is connected to the third gear.

[0018] Preferably, the adjusting mechanism includes a motor installed on the base. The output end of the motor is fixedly connected to a power shaft. A coil is rotatably connected to the power shaft. One end of the coil away from the motor is rotatably connected to an electromagnet block fixedly connected to the power shaft. A rectangular shaft is fixedly connected to the electromagnet block. A sliding sleeve rotatably connected to the sliding plate is slidably connected to the rectangular shaft. The sliding sleeve is fixedly connected to the third gear. A magnet block is arranged at one end of the sliding sleeve close to the electromagnet block. The magnetism of the electromagnet block after being energized is opposite to that of the magnet block. A second spring sleeved on the rectangular shaft is fixedly connected between the magnet block and the electromagnet block. A plug shaft is fixedly connected to one end of the sliding sleeve away from the magnet block. The cross-section of the plug shaft is rectangular and the end is tapered. The plug shaft is adapted to the first rectangular groove.

[0019] Preferably, a plurality of lifting rods slidably connected to the lower moving seat are fixedly connected to the bottom ends of the two lifting seats, which is beneficial to the stable vertical up-and-down movement of the lifting seats above the moving seat.

[0020] Preferably, a load-bearing frame for installing a welding wire reel is arranged at the top end of the lifting seat, which is beneficial to installing the welding wire reel and enabling the welding wire to cooperate smoothly with the welding torch during the welding operation.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] Through the cooperation of the operation component, the swing component and the switching component, the present invention solves the problem that when welding small-diameter pipes, generally, an operator holds a handheld welding torch for operation, which limits the operation, easily leads to uneven welding joints, and has a high error rate. First, the two pipes to be welded are fixed. Through the cooperation of the switching component and the operation component, the inner walls of the pipes are polished and cleaned first. Then, the welding torch is moved to the welding position. When performing the welding operation, the switching component is docked with the swing component, and the switching component drives the swing component to operate. When welding, the welding torch is driven to swing slightly back and forth to improve the uniformity during welding. Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the following-described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

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

[0025] Figure 2 is Figure 1Enlarged view of area A;

[0026] Figure 3 is Figure 1 Enlarged view of area B;

[0027] Figure 4 Schematic diagram of the structure under the base of the present invention;

[0028] Figure 5 Schematic diagram of the connection structure between the control seat and the turntable part of the present invention;

[0029] Figure 6 Schematic diagram of the partial structure of the operation component of the present invention;

[0030] Figure 7 Schematic diagram of the structural cooperation between the switching component, the operation component and the swinging component of the present invention;

[0031] Figure 8 Schematic diagram of the partial structural cooperation of the adjusting mechanism of the present invention.

[0032] Description of figure numbers: 1. Base; 2. Control seat; 3. Turntable; 4. Clamping plate; 5. Moving groove; 6. Operation component; 7. Moving seat; 8. First electric telescopic rod; 9. Lifting seat; 10. Swinging component; 11. Switching component; 12. Second electric telescopic rod; 13. Mounting frame; 14. Welding torch; 15. Grinding rod; 16. Moving mechanism; 17. Threaded rod; 18. Moving box; 19. Moving table; 20. Connecting block; 21. Fixed rod; 22. First spring; 23. Reciprocating rod; 24. Sphere; 25. Moving plate; 26. Driving mechanism; 27. Rotating block; 28. Eccentric shaft; 29. First bevel gear; 30. Bent block; 31. Second bevel gear; 32. Rectangular rod; 33. Fixed frame; 34. First docking shaft; 35. First rectangular groove; 36. Second docking shaft; 37. Second rectangular groove; 38. First gear; 39. Second gear; 40. Third gear; 41. Fourth gear; 42. Adjusting mechanism; 43. Motor; 44. Power shaft; 45. Coil; 46. Electromagnetic block; 47. Rectangular shaft; 48. Sliding sleeve; 49. Magnet block; 50. Second spring; 51. Insertion shaft; 52. Pipe; 53. Sliding plate. Detailed implementation mode

[0033] The present invention will be further described in detail below with reference to the accompanying drawings.

[0034] Embodiment:

[0035] Please refer to Figures 1-8 , a method for welding the inner wall of a small-diameter pipe, comprising the following steps:

[0036] S1. Use tools such as angle grinders, files, abrasive cloth, and wire brushes to clean the oil, moisture, oxides, burrs, and rust in the two sets of pipes 52 to be welded until metallic luster appears.

[0037] S2. Fix the pipes 52 after cleaning respectively, and butt the ends of the two sets of pipes 52.

[0038] S3. Control the welding equipment to operate, weld the two sets of small-diameter pipes 52, and control the welding temperature during the welding process to avoid excessive temperature causing deformation or cracks in the stainless-steel lining of the steel pipe.

[0039] S4. After welding, post-treatment of the welded joints is required, such as cleaning, grinding, etc., to avoid leaving welding slag and other impurities that affect the use effect; S5. Release the fixation of the welded pipes 52 and remove them, and then check whether the welded joints meet the requirements and whether there is oxidation and contamination.

[0040] A welding equipment for the inner wall of small-diameter pipes, including a base 1, a control seat 2 is arranged in the center of the base 1, a turntable 3 is rotatably connected to the control seat 2, clamping disks 4 for clamping are arranged on both sides of the turntable 3, and a plurality of groups of moving grooves 5 that are mirror-symmetrically arranged on both sides of the control seat 2 are opened on the base 1; an operating component 6, the operating component 6 is arranged on the base 1 and cooperates with the turntable 3, and it includes two groups of moving seats 7 that are mirror-symmetrically arranged on both sides of the turntable 3, a first electric telescopic rod 8 is arranged in each of the two groups of moving seats 7, the top end of the first electric telescopic rod 8 is fixedly connected with a lifting seat 9 located above the moving seat 7, and the operating component 6 is used for welding and grinding operations on the two sets of pipes 52; a swinging component 10, the swinging component 10 is arranged on the moving seat 7 and connected to the operating component 6, and it is used to drive the welding head to swing back and forth at the welding position during welding, so as to improve the welding uniformity; a switching component 11, the switching component 11 is arranged on the base 1 and cooperates with the operating component 6 and the swinging component 10, and it is used for switching to drive the operating component 6 and the swinging component 10 to operate respectively. Among them, in order to enable the lifting seat 9 to perform stable vertical lifting above the moving seat 7, a plurality of lifting rods that are slidably connected to the lower moving seat 7 are fixedly connected to the bottom ends of the two groups of lifting seats 9. In addition, in order to facilitate the smooth cooperation of the welding wire with the welding torch 14 during welding work, a load-bearing frame for installing a welding wire reel is arranged at the top end of the lifting seat 9.

[0041] Please refer to Figures 1-6, the operating component 6 further includes a second electric telescopic rod 12 disposed in two sets of mirror settings with its output end facing the turntable 3. The second electric telescopic rod 12 is fixedly connected to a mounting frame 13 fixedly connected to the lifting seat 9. A welding torch 14 is slidably connected to one set of mounting frames 13, and the end of the welding torch 14 is fixedly connected to the output end of the corresponding second electric telescopic rod 12. A grinding rod 15 is disposed on the other set of mounting frames 13, and the end of the grinding rod 15 is fixedly connected to the output end of the corresponding second electric telescopic rod 12. A moving mechanism 16 for driving the two moving seats 7 to move is disposed in the base 1. The moving mechanism 16 includes a threaded rod 17 disposed in the base 1 and rotatably connected thereto. A moving box 18 threadedly connected to the threaded rod 17 is slidably connected to the moving seat 7 below the welding torch 14. The moving box 18 is slidably connected to the moving groove 5. A moving table 19 threadedly connected to the threaded rod 17 is fixedly connected to the moving seat 7 below the grinding rod 15. The moving table 19 is slidably connected to the moving groove 5.

[0042] Please refer to Figures 1-6 , the swinging component 10 includes a connecting block 20 disposed inside the moving box 18 and slidably connected thereto. The connecting block 20 is fixedly connected to the contacting moving seat 7. A plurality of fixing rods 21 fixedly connected to the moving seat 7 and the moving block are fixedly connected inside the moving box 18. First springs 22 sleeved on the fixing rods 21 are disposed on both sides of the moving seat 7 and the moving block. A reciprocating rod 23 having one end fixedly connected thereto is disposed on the moving block. The other end of the reciprocating rod 23 is located outside the moving box 18 and is provided with a sphere 24. A moving plate 25 fixedly connected to the outside of the moving box 18 is disposed below the sphere 24. A driving mechanism 26 connected to the control seat 2 is disposed on the moving plate 25. The driving mechanism 26 includes a rotating block 27 disposed on the moving plate 25. An eccentric shaft 28 rotatably connected to the moving plate 25 is fixedly connected to the rotating block 27 near the arc edge. A first bevel gear 29 is fixedly connected to the eccentric shaft 28. The eccentric shaft 28 is rotatably connected to a bent block 30. The bent block 30 is rotatably connected to a second bevel gear 31 meshing with the first bevel gear 29. A rectangular rod 32 rotatably connected to the control seat 2 is slidably connected to the second bevel gear 31. The end of the rectangular rod 32 away from the control seat 2 is tapered. A connecting ring rotatably connected to the bent block 30 is slidably connected to the rectangular rod 32. The sphere 24 on the reciprocating rod 23 always abuts against the side surface of the rotating block 27.

[0043] Please refer to Figure 3 , Figure 7 and Figure 8, the switching component 11 includes a fixing frame 33 disposed at and fixedly connected to one end of the base 1. The fixing frame 33 is rotatably connected to the threaded rod 17. A sliding plate 53 is slidably connected to the fixing frame 33. A first docking shaft 34 is rotatably connected to the connecting frame. A first rectangular groove 35 is formed on the first docking shaft 34. A second docking shaft 36 is rotatably connected to the top end of the sliding plate 53. A second rectangular groove 37 adapted to the rectangular rod 32 is formed on the second docking shaft 36. A first gear 38 is fixedly connected to the first docking shaft 34. The first gear 38 is meshed with a second gear 39 fixedly connected to the threaded rod 17. A third gear 40 is rotatably connected to the sliding plate 53. The third gear 40 is meshed with a fourth gear 41 fixedly connected to the second docking shaft 36. The third gear 40 is connected to an adjusting mechanism 42 disposed on the base 1. The adjusting mechanism 42 includes a motor 43 installed on the base 1. The output end of the motor 43 is fixedly connected to a power shaft 44. A coil 45 is rotatably connected to the power shaft 44. One end of the coil 45 away from the motor 43 is rotatably connected to an electromagnet block 46 fixedly connected to the power shaft 44. A rectangular shaft 47 is fixedly connected to the electromagnet block 46. A sliding sleeve 48 rotatably connected to the sliding plate 53 is slidably connected to the rectangular shaft 47. The sliding sleeve 48 is fixedly connected to the third gear 40. A magnet block 49 is disposed at one end of the sliding sleeve 48 close to the electromagnet block 46. The magnetism of the electromagnet block 46 after being energized is opposite to that of the magnet block 49. A second spring 50 sleeved on the rectangular shaft 47 is fixedly connected between the magnet block 49 and the electromagnet block 46. A plug shaft 51 is fixedly connected to one end of the sliding sleeve 48 away from the magnet block 49. The cross-section of the plug shaft 51 is rectangular and the end is tapered. The plug shaft 51 is adapted to the first rectangular groove 35.

[0044] During the implementation process, first fix the two pipes 52 to be welded on the clamping disks 4 on both sides of the turntable 3 respectively. Then, according to the different diameters of the pipes 52, control the first electric telescopic rods 8 in the two moving seats 7 to operate simultaneously, drive the lifting seat 9 above to perform lifting adjustment until the ends of the welding torch 14 and the grinding rod 15 can extend into the pipes 52 and be close to the side walls, and then carry out the welding work. In the initial state, as Figure 1 shown, at this time, control the motor 43 to operate. The motor 43 drives the power shaft 44 to rotate through the output end. The power shaft 44 further drives the fixedly connected rectangular shaft 47 to rotate. The rectangular shaft 47 drives the plug shaft 51 to rotate through the sliding sleeve 48, and through the cooperation of the plug shaft 51 and the first rectangular groove 35, further drives the first docking shaft 34 to rotate on the fixing frame 33. The first gear 38 on the first docking shaft 34 rotates simultaneously. Through the meshing connection of the first gear 38 and the second gear 39, the second gear 39 drives the fixedly connected threaded rod 17 to rotate at this time;

[0045] Through the threaded connection of the threaded rod 17 with the moving box 18 and the moving table 19, the moving box 18 and the moving table 19 are driven to move in the same direction in the moving grooves 5 on both sides. The moving box 18 and the moving table 19 respectively drive the two groups of moving seats 7 to move simultaneously, and the moving seats 7 further drive the lifting seat 9 above to move, finally enabling the control welding torch 14 to enter the welding position inside the pipe 52. If the length of the pipe 52 is relatively long, resulting in the inability of the moving box 18 to continue moving, at this time, the second electric telescopic rod 12 on the lifting seat 9 is controlled to operate, and the second electric telescopic rod 12 drives the end of the welding torch 14 to continue moving into the pipe 52. The welding torch 14 also slides on the mounting bracket 13, and finally the end of the welding torch 14 is located at the welding position of the two pipes 52;

[0046] After the position adjustment is completed, the coil 45 is energized. The electromagnet block 46 on the coil 45 is magnetic at this time. Since the magnetism of the electromagnet block 46 after being energized is opposite to that of the magnet block 49, the electromagnet block 46 attracts the magnet block 49 at this time. The magnet block 49 drives the sliding sleeve 48 to move in the direction of the electromagnet block 46, and the second spring 50 is compressed until the insertion shaft 51 at the end of the sliding sleeve 48 completely moves out of the first rectangular groove 35, causing the insertion shaft 51 to disconnect from the first docking shaft 34. When the sliding sleeve 48 slides on the rectangular shaft 47, it simultaneously drives the sliding plate 53 to slide on the fixed bracket 33, and the second docking shaft 36 on the sliding plate 53 moves accordingly. When the insertion shaft 51 disconnects from the first docking shaft 34, the second docking shaft 36 moves, and the rectangular rod 32 is inserted into the second rectangular groove 37. At this time, the switching is completed. When the welding torch 14 is performing welding work, the motor 43 is controlled to operate again, and then the sliding sleeve 48 is driven to rotate on the sliding plate 53 again. The third gear 40 fixedly connected to the sliding sleeve 48 rotates accordingly. Through the meshing connection of the third gear 40 and the fourth gear 41, the fourth gear 41 drives the second docking shaft 36 to rotate. The second docking shaft 36 further drives the slidably connected rectangular rod 32 to rotate on the control seat 2 and drives the second bevel gear 31 to rotate. Through the meshing connection of the second bevel gear 31 and the first bevel gear 29, when the second bevel gear 31 rotates on the bending block 30, it simultaneously drives the first bevel gear 29 to rotate. The first bevel gear 29 drives the lower eccentric shaft 28 to rotate on the moving plate 25 and drives the rotating block 27 to rotate;

[0047] Since the sphere 24 on the reciprocating rod 23 always abuts against the side surface of the rotating block 27, and at the same time the distance between the side surface of the rotating block 27 and the moving box 18 changes continuously during rotation, the reciprocating shaft is driven to slide reciprocally on the side surface of the moving box 18, thereby driving the connecting block 20 and the moving seat 7 to slide in the moving box 18. When the connecting block 20 and the moving seat 7 slide with the fixed rod 21, the first spring 22 is continuously squeezed. In cooperation with the continuous change of the distance between the rotating block 27 and the moving box 18, the first spring 22 also continuously pushes the connecting block 20 and the moving seat 7 to reset. At this time, the moving seat 7 makes short-distance reciprocating movements continuously in the moving box 18, and at the same time drives the lifting seat 9 above to make reciprocating movements, thereby driving the welding torch 14 to move through the mounting bracket 13. When the welding torch 14 performs welding work, while the welding torch 14 is working, the control seat 2 drives the turntable 3 to rotate slowly, driving the clamping discs 4 on both sides to rotate, thereby driving the fixed pipe 52 to rotate simultaneously until the pipe 52 rotates 360 degrees, and the welding is completed. The welding torch 14 moves back and forth at the welding joint of the two pipes 52, simulating the continuous swinging of the head of the welding torch 14 during manual welding, so as to make the traces at the welding joint uniform;

[0048] After the welding is completed, the coil 45 is powered off, and the first spring 22 rebounds, finally causing the second docking shaft 36 to disengage from the connection with the rectangular rod 32, and the plug shaft 51 is inserted into the first rectangular groove 35 again. At this time, the motor 43 drives the threaded rod 17 to rotate again, so that the lifting seat 9 where the welding torch 14 is located moves away from the pipe 52, and the lifting seat 9 with the grinding rod 15 on the other side gradually approaches the pipe 52. Finally, the end of the grinding rod 15 moves to the welding joint. The rotation of the grinding rod 15 is controlled, and at the same time, the control seat 2 drives the turntable 3 to rotate slowly again, and the welded pipe 52 is driven to rotate simultaneously through the clamping disc 4 until the welding joint of the pipe 52 is polished. The overall investment in labor is saved, and the probability of welding errors is reduced.

Claims

1. A welding method for the inner wall of a small-diameter pipe, characterized in that, It includes the following steps: S1. Use tools such as angle grinders, files, sandpapers, and wire brushes to clean the oil, moisture, oxides, burrs, and rust in the two sets of pipes (52) to be welded until metallic luster appears. S2. Fix the pipes (52) after cleaning respectively, and butt the ends of the two sets of pipes (52). S3. Control the welding equipment to operate, weld the two sets of small-diameter pipes (52), and control the welding temperature during welding to avoid deformation or cracks in the stainless-steel lining of the steel pipe caused by excessive temperature. S4. After welding, post-treatment of the welded joint is required, such as cleaning, grinding, etc., to avoid leaving welding slag and other impurities that affect the use effect; S5. Release the fixation of the welded pipes (52) and remove them, and then check whether the welded joint meets the requirements and whether there is oxidation and contamination.

2. The welding device for the inner wall of a small-diameter pipe according to claim 1, characterized in that, It includes: A base (1), a control seat (2) is arranged in the center of the base (1), the control seat (2) is rotatably connected with a turntable (3), clamping disks (4) for clamping are arranged on both sides of the turntable (3), and a plurality of groups of moving grooves (5) are formed on the base (1) and are mirror-symmetrically arranged on both sides of the control seat (2). An operation component (6), the operation component (6) is arranged on the base (1) and cooperates with the turntable (3), and it includes two moving seats (7) that are mirror-symmetrically arranged on both sides of the turntable (3). A first electric telescopic rod (8) is arranged in each of the two moving seats (7), and the top end of the first electric telescopic rod (8) is fixedly connected with a lifting seat (9) located above the moving seat (7). The operation component (6) is used for welding and grinding operations on the two sets of pipes (52). A swinging component (10), the swinging component (10) is arranged on the moving seat (7) and is connected with the operation component (6), and it is used to drive the welding head to swing back and forth at the welding position during welding, so as to improve the welding uniformity. A switching component (11), the switching component (11) is arranged on the base (1) and cooperates with the operation component (6) and the swinging component (10), and it is used for switching to drive the operation component (6) and the swinging component (10) to operate respectively.

3. The welding device for the inner wall of a small-diameter pipe according to claim 2, characterized in that: The operation component (6) further includes second electric telescopic rods (12) that are mirror-symmetrically arranged and whose output ends face the turntable (3). The second electric telescopic rods (12) are fixedly connected with a mounting frame (13) that is fixedly connected with the lifting seat (9). A welding torch (14) is slidably connected to one group of the mounting frames (13), and the end of the welding torch (14) is fixedly connected with the output end of the corresponding second electric telescopic rod (12). A grinding rod (15) is arranged on the other group of the mounting frames (13), and the end of the grinding rod (15) is fixedly connected with the output end of the corresponding second electric telescopic rod (12). A moving mechanism (16) for driving the two moving seats (7) to move is arranged in the base (1).

4. A welding device for the inner wall of a small-diameter pipe according to claim 3, characterized in that: The moving mechanism (16) includes a threaded rod (17) disposed in and rotatably connected to the base (1). A moving box (18) threadedly connected to the threaded rod (17) is slidably connected to the moving seat (7) below the welding torch (14). The moving box (18) is slidably connected to the moving groove (5). A moving table (19) threadedly connected to the threaded rod (17) is fixedly connected to the moving seat (7) below the grinding rod (15). The moving table (19) is slidably connected to the moving groove (5).

5. The welding device for the inner wall of a small-diameter pipe according to claim 4, characterized in that: The swinging assembly (10) includes a connecting block (20) disposed inside and slidably connected to the moving box (18). The connecting block (20) is fixedly connected to the contacting moving seat (7). A plurality of fixed rods (21) fixedly connected to the moving box (18) and slidably connected to the moving seat (7) and the moving block are provided inside the moving box (18). First springs (22) sleeved on the fixed rods (21) are disposed on both sides of the moving seat (7) and the moving block. A reciprocating rod (23) having one end fixedly connected thereto is provided on the moving block. The other end of the reciprocating rod (23) is located outside the moving box (18) and is provided with a sphere (24). A moving plate (25) fixedly connected to the outside of the moving box (18) is disposed below the sphere (24). A driving mechanism (26) connected to the control seat (2) is provided on the moving plate (25).

6. The welding device for the inner wall of a small-diameter pipe according to claim 5, characterized in that: The driving mechanism (26) includes a rotating block (27) disposed on the moving plate (25). An eccentric shaft (28) rotatably connected to the moving plate (25) is fixedly connected to the rotating block (27) near the arc edge. A first bevel gear (29) is fixedly connected to the eccentric shaft (28). The eccentric shaft (28) is rotatably connected to a bent block (30). The bent block (30) is rotatably connected to a second bevel gear (31) meshingly connected to the first bevel gear (29). A rectangular rod (32) rotatably connected to the control seat (2) is slidably connected to the second bevel gear (31). One end of the rectangular rod (32) away from the control seat (2) is tapered. A connecting ring rotatably connected to the bent block (30) is slidably connected to the rectangular rod (32).

7. A welding device for the inner wall of a small-diameter pipe according to claim 6, characterized in that: The switching component (11) includes a fixing frame (33) arranged at the end of the base (1) and fixedly connected thereto. The fixing frame (33) is rotatably connected to the threaded rod (17). A sliding plate (53) is slidably connected to the fixing frame (33). A first docking shaft (34) is rotatably connected to the connecting frame. A first rectangular groove (35) is formed on the first docking shaft (34). A second docking shaft (36) is rotatably connected to the top end of the sliding plate (53). A second rectangular groove (37) adapted to the rectangular rod (32) is formed on the second docking shaft (36). A first gear (38) is fixedly connected to the first docking shaft (34). The first gear (38) is meshed with a second gear (39) fixedly connected to the threaded rod (17). A third gear (40) is rotatably connected to the sliding plate (53). The third gear (40) is meshed with a fourth gear (41) fixedly connected to the second docking shaft (36). The third gear (40) is connected to an adjusting mechanism (42) arranged on the base (1).

8. The welding device for the inner wall of a small-diameter pipe according to claim 7, characterized in that: The adjusting mechanism (42) includes a motor (43) installed on the base (1). The output end of the motor (43) is fixedly connected to a power shaft (44). A coil (45) is rotatably connected to the power shaft (44). One end of the coil (45) away from the motor (43) is rotatably connected to an electromagnet block (46) fixedly connected to the power shaft (44). A rectangular shaft (47) is fixedly connected to the electromagnet block (46). A sliding sleeve (48) rotatably connected to the sliding plate (53) is slidably connected to the rectangular shaft (47). The sliding sleeve (48) is fixedly connected to the third gear (40). A magnet block (49) is arranged at one end of the sliding sleeve (48) close to the electromagnet block (46). The magnetism of the electromagnet block (46) after being energized is opposite to that of the magnet block (49). A second spring (50) sleeved on the rectangular shaft (47) is fixedly connected between the magnet block (49) and the electromagnet block (46). A plugging shaft (51) is fixedly connected to the end of the sliding sleeve (48) away from the magnet block (49). The cross section of the plugging shaft (51) is rectangular and the end is conical. The plugging shaft (51) is adapted to the first rectangular groove (35).

9. The welding device for the inner wall of a small-diameter pipe according to claim 2, characterized in that: At the bottom ends of the two lifting seats (9), a plurality of lifting rods slidably connected to the lower moving seat (7) are fixedly connected respectively.

10. The welding device for the inner wall of a small-diameter pipe according to claim 1, characterized in that: A load-bearing frame for installing a wire reel is arranged at the top end of the lifting seat (9).

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