Steel pipe welding device and use method thereof

Abstract

The present invention relates to a steel pipe welding device and a method for using the same, which comprises a base, a plurality of mounting platforms are slidably matched on the base, a driving assembly for driving the mounting platform to move is arranged on the mounting platform, a plurality of supporting rollers and rolling members for driving the supporting rollers to rotate are rotatably connected on the mounting platform, the supporting rollers are connected to the output end of the rolling members, a fixed frame is connected to the base, a welding gun and a moving member for driving the welding gun to move are arranged on the fixed frame, the welding gun is connected to the output end of the moving member, a grinding wheel, a rotating member for driving the grinding wheel to rotate, and a lifting assembly for driving the grinding wheel to lift are also arranged on the fixed frame, the grinding wheel is connected to the output end of the rotating member, the grinding wheel and the rotating member are both connected to the lifting assembly, when welding a steel pipe, the steel pipe is placed on the supporting roller, the welding gun welds the joint between two steel pipes, and the grinding wheel grinds the weld. The present invention has the effect of improving the welding efficiency of the steel pipe.

Description

Technical Field

[0001] The present invention relates to the technical field of steel pipe welding, and in particular to a steel pipe welding device and a use method thereof. Background Art

[0002] Steel pipe is a hollow steel tube whose length is much greater than its diameter or circumference. Steel pipe is not only used to transport fluids and powdered solids, exchange heat, and manufacture mechanical parts and containers, but it is also an economical steel material. Steel pipe can only be processed to a certain length, but actual construction requires longer lengths, so welding equipment is required to weld two pipes together to meet actual installation requirements.

[0003] The Chinese patent with announcement number CN214264631U discloses a steel pipe welding device, which includes a base, a support roller, a drive assembly, a welding assembly and a grinding assembly. The support roller is rotatably mounted on the base, and the drive assembly drives the steel pipe to rotate by driving the support roller. The welding head of the welding assembly is aligned with the butt joint of the steel pipe. By making the support roller include a support roller body and a plurality of spacer rings, the spacer rings can be axially slidably mounted on the support roller body and rotate synchronously with the support roller body. By adjusting the position of the spacer, a gap larger than the butt joint can be formed between adjacent spacer rings to avoid the weld scar on the butt joint. The steel pipe will not jump up and down when it rotates. In addition, the welding head is aligned with the butt joint, so that welding can be performed on the steel pipe during its rotation. The welding consistency is good and the alignment of the steel pipe is good. By setting a grinding assembly to grind the butt joint before welding, the welding effect can be improved. Then, the grinding assembly is used to grind the weld scar after welding, which can simplify the production process.

[0004] Regarding the above-mentioned related technologies, the welding device in the prior art requires a prerequisite when welding two steel pipes. It is necessary to perform preliminary welding on the two steel pipes in advance so that the two steel pipes can rotate synchronously. Only in this way can the circumferential welding of the steel pipes be completed. The preliminary welding is completed on other equipment, and then installed and processed on the welding device in the prior art. The two installations are likely to increase the welding error of the steel pipes, and are relatively time-consuming, which reduces the welding efficiency of the steel pipes. Summary of the Invention

[0005] In order to improve the welding efficiency of steel pipes, the present application provides a steel pipe welding device and a method for using the same.

[0006] The present application provides a steel pipe welding device and a method for using the same, which employ the following technical solutions:

[0007] The cam is provided with a plurality of support rollers and a roller that drives the support roller to rotate, and the support roller is connected to the output end of the roller. The base is connected to a fixed frame, and a welding gun and a movable member that drives the welding gun to move are provided on the fixed frame. The welding gun is connected to the output end of the movable member. The fixed frame is also provided with a grinding wheel, a rotating member that drives the grinding wheel to rotate, and a lifting assembly that drives the grinding wheel to rise and fall. The grinding wheel is connected to the output end of the rotating member, and the grinding wheel and the rotating member are both connected to the lifting assembly. When welding a steel pipe, the steel pipe is placed on the supporting roller, the welding gun welds the joint between two steel pipes, and the grinding wheel grinds the weld.

[0008] By adopting the above technical solution, during welding, the worker uses the drive assembly to move the mounting table, moves the steel pipe to the grinding wheel position, rotates the steel pipe using the rolling element, and raises and lowers the grinding wheel using the lifting assembly to grind the end of the steel pipe. The moving element then pushes the welding gun to spot weld the joint of the steel pipe. The joint is then completely welded, and finally the weld is polished with the grinding wheel, achieving the desired weld quality. The worker uses a single welding device to complete the initial welding, final welding, and grinding operations of the steel pipe, all with a single installation of the steel pipe. This reduces welding errors, shortens welding time, and improves welding efficiency.

[0009] Optionally, the driving assembly includes a driving motor, a rotating gear and a fixed rack, a sliding rail is connected to the base, a sliding seat is connected to the mounting platform, the sliding seat slides on the sliding rail, the fixed rack is connected to the sliding rail, the driving motor is connected to the mounting platform, and the rotating gear is connected to the output shaft of the driving motor and engages with the fixed rack.

[0010] By adopting the above technical solution, when moving the steel pipe, the staff starts the drive motor to rotate the rotating gear, thereby driving the installation platform to move, thereby achieving the effect of moving the steel pipe.

[0011] Optionally, the lifting assembly includes a lifting motor, an active bevel gear, a driven bevel gear, a lifting column and a limiting block, the lifting column is vertically arranged and slidably fitted on the fixed frame, the limiting block is connected to the fixed frame, a limiting groove is opened on the lifting column, the limiting groove is vertically arranged, the limiting block slidably fits in the limiting groove, the driven bevel gear is rotatably connected to the fixed frame and threadedly cooperates with the lifting column, the fixed frame is rotatably connected to a rotating shaft, the active bevel gear is connected to the rotating shaft and meshes with the driven bevel gear, the lifting motor is connected to the fixed frame and coaxially connected with the rotating shaft, the bottom end of the lifting column is connected to a fixed plate, the grinding wheel is rotatably connected to the fixed plate, the rotating member is a rotating motor, and the rotating member is connected to the fixed plate and connected to the grinding wheel.

[0012] By adopting the above technical solution, when raising or lowering the grinding wheel, the staff starts the lifting motor to rotate the rotating shaft, driving the active bevel gear to rotate, and the driven bevel gear to rotate. Due to the restriction of the limiting block, the lifting column is lowered, driving the fixed plate to lower, thereby achieving the effect of raising and lowering the grinding wheel.

[0013] Optionally, a rotating frame is rotatably connected to the fixed plate, a scrubbing wheel is connected to the rotating frame, and a stabilizing component for stabilizing the rotating frame is provided on the fixed plate.

[0014] By adopting the above technical solution, when grinding the welded ends of steel pipes, a lot of dust or grinding wheel particles will adhere to the ends of the steel pipes. If the steel pipes are welded at this time, it is easy to cause gaps in the weld. The staff uses a scrubbing wheel to scrub the ends of the steel pipes to remove dust and grinding wheel particles, reducing the possibility of gaps in the weld.

[0015] Optionally, the scrubbing wheel includes a fixed wheel, a brush bar and a scraper, the fixed wheel is connected to the rotating frame, the arc surface of the fixed wheel is connected to a fixed ring, and several brush bars and scrapers are connected to the side wall of the fixed ring.

[0016] By adopting the above technical solution, the staff can better wash away the dust or grinding wheel particles on the end of the steel pipe by using the combination of the brush bar and the scraper, thereby improving the effect of washing the end of the steel pipe.

[0017] Optionally, the brush bar and the scraper are both made of plastic material.

[0018] By adopting the above technical solution, since the density of plastic is lower than that of steel, the brush strips and scrapers made of plastic will not cause damage to the ends of the steel pipes. At the same time, the brush strips and scrapers are not easily damaged, reducing the possibility of residues being retained at the ends of the steel pipes due to damage to the scrubbing wheel.

[0019] Optionally, the stabilizing component includes a fixing block, a clamping ball and a clamping spring, a clamping hole is provided on the rotating frame, the clamping ball and the clamping spring are both arranged in the clamping hole, the clamping spring is located between the clamping ball and the bottom wall of the clamping hole, a first fixing rod and a second fixing rod are connected to the fixing plate, the fixing block is connected to the first fixing rod and the second fixing rod, a clamping groove matching the shape of the clamping ball is provided on the fixing block, when stabilizing the scrubbing wheel, the clamping ball is located in the clamping groove, and in the initial position, the clamping ball is located in the clamping groove of the fixing block on the first fixing rod.

[0020] By adopting the above technical solution, in the initial state, the tightening ball is partially located in the tightening groove of the fixed block on the first fixed rod. When washing the steel pipe, the staff swings the rotating frame to make the tightening ball disengage from the fixed block on the first fixed rod until the rotating frame swings to the specified angle. During this process, the tightening ball hits the fixed block on the second fixed rod, and the tightening ball moves into the tightening hole until the tightening groove is flush with the tightening hole. The tightening ball moves in the opposite direction under the action of the tightening spring, and the tightening ball enters the tightening groove of the fixed block on the second fixed rod. At this time, the bristles and the scraper contact the end wall of the steel pipe, achieving the effect of the scrubbing wheel washing the end of the steel pipe.

[0021] Optionally, a protective layer is connected to the surface of the supporting roller.

[0022] By adopting the above technical solution, the protective layer is used to protect the surface of the steel pipe, reducing the possibility of damage to the surface of the steel pipe when the steel pipe rotates.

[0023] A method for using a steel pipe welding device comprises the following steps:

[0024] S1. Installing the steel pipe: placing the steel pipe on the support roller;

[0025] S2, grinding the ends of the steel pipe: using the side wall of the grinding wheel to grind the welded ends of the steel pipe;

[0026] S3, initial welding of the steel pipes: using the welding gun to spot weld the joint between the two steel pipes in conjunction with the rotating steel pipes;

[0027] S4, fully welded steel pipe: using the welding gun to weld all the welds around the steel pipe;

[0028] S5. Grinding the weld: using the rotating member to rotate the grinding wheel in the opposite direction, so that the grinding wheel grinds the weld.

[0029] By adopting the above technical solution, the staff first uses a grinding wheel to grind the ends of the steel pipes flush, so that the gap between the two steel pipes is reduced as much as possible when they are in contact. Then they use a welding gun to spot weld the joints of the two steel pipes so that the two steel pipes can rotate synchronously and stably. Then they weld all the joints, and finally use a grinding wheel to grind the welds. Only in this way can the welds be neat and beautiful, thereby improving the welding effect of the steel pipes.

[0030] In summary, this application includes at least one of the following beneficial technical effects:

[0031] 1. During welding, the worker uses the drive assembly to move the mounting table, moves the steel pipe to the grinding wheel position, rotates the steel pipe using the rolling element, and raises and lowers the grinding wheel using the lifting assembly to grind the end of the steel pipe. The worker then uses the moving element to push the welding gun to spot weld the joints of the steel pipe, then welds all the joints, and finally grinds the weld with the grinding wheel to achieve the effect of welding the steel pipe. The worker uses a single welding device to complete the initial welding, final welding, and grinding operations of the steel pipe, and can complete the process by installing the steel pipe only once, reducing the welding error of the steel pipe, shortening the welding time of the steel pipe, and improving the welding efficiency of the steel pipe.

[0032] 2. In the initial state, the tightening ball is partially located in the tightening groove of the fixed block on the first fixed rod. When cleaning the steel pipe, the staff swings the rotating frame to disengage the tightening ball from the fixed block on the first fixed rod until the rotating frame swings to a specified angle. During this process, the tightening ball hits the fixed block on the second fixed rod, and the tightening ball moves into the tightening hole until the tightening groove is flush with the tightening hole. The tightening ball moves in the opposite direction under the action of the tightening spring and enters the tightening groove of the fixed block on the second fixed rod. At this time, the bristles and the scraper contact the end wall of the steel pipe, achieving the effect of the scrubbing wheel cleaning the end of the steel pipe;

[0033] 3. The staff first uses a grinding wheel to grind the ends of the steel pipes flush, so that the gap between the two steel pipes is reduced as much as possible when they are in contact, and then uses a welding gun to spot weld the joints of the two steel pipes so that the two steel pipes can rotate synchronously and stably. Then all the joints are welded, and finally the welds are polished with a grinding wheel. Only in this way can the welds be neat and beautiful, thereby improving the welding effect of the steel pipes. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the overall structure of a steel pipe welding device in an embodiment of the present application.

[0035] Figure 2 It is a structural diagram of the lifting assembly and the scrubbing wheel in an embodiment of the present application.

[0036] Figure 3 It is a cross-sectional view used to illustrate the structure of the lifting assembly in the embodiment of the present application.

[0037] Figure 4 It is a cross-sectional view used to illustrate the stable component structure in the embodiment of the present application.

[0038] Figure 5 This is a state diagram of the grinding wheel grinding the steel pipe weld in the embodiment of the present application.

[0039] Explanation of the accompanying drawings: 1. Base; 11. Sliding rail; 12. Fixed frame; 121. Controller; 13. Moving part; 14. Welding gun; 2. Mounting table; 21. Support roller; 22. Rolling member; 3. Driving assembly; 31. Driving motor; 32. Rotating gear; 33. Fixed rack; 4. Grinding wheel; 41. Rotating member; 5. Lifting assembly; 51. Lifting motor; 52. Driving bevel gear; 53. Driven bevel gear; 54. Lifting column; 541. Limiting groove; 542. Fixed plate; 543. First fixed rod; 544. Second fixed rod; 55. Limiting block; 6. Rotating frame; 61. Tightening hole; 7. Scrubbing wheel; 71. Fixed wheel; 72. Brush bar; 73. Scraper; 8. Stabilizing assembly; 81. Fixed block; 811. Tightening groove; 82. Tightening ball; 83. Tightening spring. DETAILED DESCRIPTION

[0040] The following is combined with Figure 1-5 This application is described in further detail.

[0041] The present application discloses a steel pipe welding device and a method of using the same. Figure 1 A steel pipe welding device includes a base 1, to which two sliding rails 11 are fixedly connected, and two mounting platforms 2 are provided on the sliding rails 11. A plurality of sliding seats are fixedly connected to the bottom wall of the mounting platform 2, and the sliding seats are slidably fitted on the sliding rails 11. A driving assembly 3 is provided on the mounting platform 2, and the driving assembly 3 includes a driving motor 31, a rotating gear 32 and a fixed rack 33. The driving motor 31 is vertically fixedly connected to the mounting platform 2, and the rotating gear 32 is fixedly connected to the output shaft of the driving motor 31. The fixed rack 33 is fixedly connected to one of the sliding rails 11, and the fixed rack 33 is parallel to the sliding rail 11 and meshes with the rotating gear 32.

[0042] Reference Figure 1 The mounting platform 2 is rotatably connected to a plurality of support rollers 21. In this embodiment, four support rollers 21 are used as an example, with two support rollers 21 on one side. One of the support rollers 21 is provided with a rolling member 22, which is a rolling motor. The rolling member 22 is coaxially connected to the two support rollers 21 on one side. The support rollers 21 are used to support and rotate the steel pipe.

[0043] When moving the steel pipe, the staff places the steel pipe on the support roller 21, and then starts the drive motor 31 to rotate the rotating gear 32, driving the mounting platform 2 to move, thereby achieving the effect of moving the steel pipe.

[0044] Reference Figure 1 In addition, in order to reduce the possibility of damage to the surface of the steel pipe, a protective layer is fixedly connected to the surface of the support roller 21, and the protective layer can be a plastic tube.

[0045] The base 1 is fixedly connected to a fixing frame 12 , the fixing frame 12 is fixedly connected to a moving part 13 , the moving part 13 is a moving cylinder, the output end of the moving part 13 is fixedly connected to a moving seat, and the moving seat is fixedly connected to a welding gun 14 .

[0046] Reference Figure 1 、 Figure 2 and Figure 3 , a grinding wheel 4 and a lifting assembly 5 are provided on the fixed frame 12. The lifting assembly 5 includes a lifting motor 51, a driving bevel gear 52, a driven bevel gear 53, a lifting column 54 and a limiting block 55. The lifting motor 51 is fixedly connected to the fixed frame 12, and a rotating shaft is rotatably connected to the fixed frame 12. One end of the rotating shaft is coaxially connected to the lifting motor 51, and the driving bevel gear 52 is fixedly connected to the other end of the rotating shaft. The lifting column 54 is vertically slidably fitted on the fixed frame 12, and the limiting block 55 is fixedly connected to the fixed frame 12. A limiting groove 541 is provided on the lifting column 54, and the limiting block 55 slides in the limiting groove 541. The driven bevel gear 53 is rotatably connected to the fixed frame 12 and is threadedly matched with the lifting column 54. The driven bevel gear 53 is meshed with the driving bevel gear 52.

[0047] Reference Figure 2 The bottom end of the lifting column 54 is fixedly connected to a fixed plate 542, and the grinding wheel 4 is rotatably connected to the fixed plate 542. The fixed plate 542 is fixedly connected to a rotating member 41, which is a rotating motor. The grinding wheel 4 is fixedly connected to the output shaft of the rotating member 41.

[0048] When raising and lowering the grinding wheel 4, the staff starts the lifting motor 51 to rotate the rotating shaft, driving the active bevel gear 52 to rotate, and the driven bevel gear 53 to rotate. Due to the restriction of the limiting block 55, the lifting column 54 is lowered, driving the fixed plate 542 to lower, thereby achieving the effect of raising and lowering the grinding wheel 4.

[0049] Reference Figure 2 The fixed plate 542 is hinged with a rotating frame 6, and the rotating frame 6 is fixedly connected to a scrubbing wheel 7, which includes a fixed wheel 71, a brush strip 72 and a scraper 73. The arc surface of the fixed wheel 71 is fixedly connected to a fixed ring. The brush strip 72 and the scraper 73 are both made of plastic material. Several brush strips 72 and scrapers 73 are fixedly connected to the side wall of the fixed ring.

[0050] Reference Figure 4A stabilizing assembly 8 is provided on the fixing plate 542, and the stabilizing assembly 8 includes a fixing block 81, a tightening ball 82, and a tightening spring 83. A tightening hole 61 is provided on the rotating frame 6, and the tightening ball 82 and the tightening spring 83 are both provided in the tightening hole 61. The tightening spring 83 is located between the tightening ball 82 and the bottom wall of the tightening hole 61, and the orifice diameter of the tightening hole 61 is smaller than the diameter of the tightening ball 82. A first fixing rod 543 and a second fixing rod 544 are fixedly connected to the fixing plate 542, and a fixing block 81 is fixedly connected at the ends of the first fixing rod 543 and the second fixing rod 544. A tightening groove 811 matching the shape of the tightening ball 82 is provided on the fixing block 81.

[0051] Reference Figure 1 、 Figure 4 and Figure 5 , in the initial state, the tightening ball 82 is partially located in the tightening groove 811 of the fixed block 81 on the first fixed rod 543. When cleaning the steel pipe, the staff swings the rotating frame 6 to disengage the tightening ball 82 from the fixed block 81 on the first fixed rod 543 until the rotating frame 6 swings to the specified angle. During this process, the tightening ball 82 hits the fixed block 81 on the second fixed rod 544, and the tightening ball 82 moves into the tightening hole 61 until the tightening groove 811 is flush with the tightening hole 61. The tightening ball 82 moves in the opposite direction under the action of the tightening spring 83, and the tightening ball 82 enters the tightening groove 811 of the fixed block 81 on the second fixed rod 544. At this time, the bristles and the scraper 73 contact the end wall of the steel pipe, achieving the effect of the scrubbing wheel 7 cleaning the end of the steel pipe.

[0052] Reference Figure 1 and Figure 2 A controller 121 is fixedly connected to the fixed frame 12 , and the driving motor 31 , the rolling element 22 , the moving element 13 , the rotating element 41 and the lifting motor 51 are all electrically connected to the controller 121 .

[0053] The implementation principle of a steel pipe welding device according to an embodiment of the present application is as follows: when welding a steel pipe, the worker places the steel pipe on the supporting roller 21, and then uses the controller 121 to start the driving motor 31 to rotate the rotating gear 32, move the mounting table 2, and drive the steel pipe to move to the grinding wheel 4, and then start the lifting motor 51 to rotate the rotating shaft, drive the active bevel gear 52 to rotate, and rotate the driven bevel gear 53. Due to the restriction of the limiting block 55, the lifting column 54 is lowered, and the fixed plate 542 is driven to lower until the side wall of the grinding wheel 4 contacts the end of the steel pipe, and the controller 121 is used to start the rolling element 22 to rotate the steel pipe, and the grinding wheel 4 grinds the end of the steel pipe, and then the rotating frame 6 is swung to drive the scrubbing wheel 7 to swing until the tightening ball 82 contacts the fixed block 81 on the second fixed rod 544, and the tightening ball 82 moves into the tightening hole 61 until the tightening groove 811 and the tightening The hole 61 is flush, and the tightening ball 82 moves in the opposite direction under the force of the tightening spring 83, and the tightening ball 82 enters the tightening groove 811 of the fixed block 81 on the second fixed rod 544. At this time, the bristles and scraper 73 contact the end wall of the steel pipe to clean the end of the steel pipe. The end of the other steel pipe is polished and cleaned in the above method, and then the swing frame is swung back to the initial position, and the lifting assembly 5 is used to raise the grinding wheel 4, and the drive assembly 3 is used to fit the ends of the two steel pipes. The controller 121 is used to start the moving part 13 to drive the welding gun 14 to move to spot weld the first position of the joint, and then cooperate with the rolling part 22 to spot weld the other positions of the joint twice, and then all the joints are welded, and finally the lifting motor 51 is started again to lower the grinding wheel 4, and the controller 121 is used to start the rotating part 41 to rotate the grinding wheel 4 in the opposite direction to grind the weld, thereby achieving the effect of welding two steel pipes.

[0054] The staff used a welding device to complete the initial welding, final welding and grinding operations of the steel pipe, and it can be completed by installing the steel pipe only once, which reduces the welding error of the steel pipe, shortens the welding time of the steel pipe, and improves the welding efficiency of the steel pipe.

[0055] A method for using a steel pipe welding device comprises the following steps:

[0056] S1. Installing the steel pipe: placing the steel pipe on the support roller 21.

[0057] S2. Grinding the end of the steel pipe: The lifting motor 51 is started by the controller 121 to rotate the rotating shaft, driving the active bevel gear 52 to rotate, and the driven bevel gear 53 to rotate. Due to the restriction of the limiting block 55, the lifting column 54 is lowered, driving the fixed plate 542 to lower, and the grinding wheel 4 is lowered. The side wall of the grinding wheel 4 is used to grind the welded end of the steel pipe.

[0058] S3. Initial welding of steel pipes: Start the driving motor 31 to drive the rotating gear 32 to rotate, move the mounting platform 2, and fit the two ends of the steel pipes together. Then start the moving part 13 to move the welding gun 14. First, use the welding gun 14 to spot weld the first position of the joint between the two steel pipes. Then start the rolling part 22 to rotate the supporting roller 21, drive the steel pipe to rotate, and spot weld other positions of the joint.

[0059] S4, fully welded steel pipe: start the moving part 13 to drive the welding gun 14 to move, so that the welding gun 14 continuously welds all the joints along the circumference of the steel pipe.

[0060] S5. Grinding the weld: Using the above method, the lifting assembly 5 lowers the grinding wheel 4, and the rotating member 41 is started to rotate the grinding wheel 4 in the opposite direction so that the arc edge of the grinding wheel 4 contacts the weld to grind the weld.

[0061] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A steel pipe welding device, characterized in that: The invention comprises a base (1), a plurality of mounting platforms (2) are slidably matched on the base (1), a driving assembly (3) for driving the mounting platforms (2) to move is arranged on the mounting platforms (2), a plurality of supporting rollers (21) and rolling elements (22) for driving the supporting rollers (21) to rotate are rotatably connected on the mounting platforms (2), the supporting rollers (21) are connected to the output ends of the rolling elements (22), the base (1) is connected to a fixing frame (12), a welding gun (14) and a moving element (13) for driving the welding gun (14) to move are arranged on the fixing frame (12), the welding gun (14) is connected to the output end of the moving element (13), and the welding gun (14) is connected to the output end of the moving element (13). The fixed frame (12) is also provided with a grinding wheel (4), a rotating member (41) for driving the grinding wheel (4) to rotate, and a lifting assembly (5) for driving the grinding wheel (4) to lift and lower. The grinding wheel (4) is connected to the output end of the rotating member (41). The grinding wheel (4) and the rotating member (41) are both connected to the lifting assembly (5). When welding a steel pipe, the steel pipe is placed on the supporting roller (21), the welding gun (14) welds the joint between the two steel pipes, and the grinding wheel (4) grinds the weld. The lifting assembly (5) includes a lifting motor (51), a driving bevel gear (52), and a driven bevel gear (53). ), a lifting column (54) and a limiting block (55), wherein the lifting column (54) is vertically arranged and slidably matched on the fixing frame (12), the limiting block (55) is connected to the fixing frame (12), a limiting groove (541) is opened on the lifting column (54), the limiting groove (541) is vertically arranged, and the limiting block (55) is slidably matched in the limiting groove (541), the driven bevel gear (53) is rotatably connected to the fixing frame (12) and is threadedly matched with the lifting column (54), the fixing frame (12) is rotatably connected with a rotating shaft, the driving bevel gear (52) is connected to the rotating shaft and is threadedly matched with the driven bevel gear (53), and the driving bevel gear (52) is connected to the rotating shaft and is threadedly matched with the driven bevel gear (53). The bevel gear (53) is meshed, the lifting motor (51) is connected to the fixed frame (12) and is coaxially connected to the rotating shaft, the bottom end of the lifting column (54) is connected to a fixed plate (542), the grinding wheel (4) is rotatably connected to the fixed plate (542), the rotating member (41) is a rotating motor, the rotating member (41) is connected to the fixed plate (542) and is connected to the grinding wheel (4); the fixed plate (542) is rotatably connected to a rotating frame (6), the rotating frame (6) is connected to a scrubbing wheel (7), and the fixed plate (542) is provided with a stabilizing component (8) for stabilizing the rotating frame (6);The scrubbing wheel (7) comprises a fixed wheel (71), a brush strip (72) and a scraper (73); the fixed wheel (71) is connected to the rotating frame (6); a fixed ring is connected to the arc surface of the fixed wheel (71); a plurality of the brush strips (72) and the scraper (73) are connected to the side wall of the fixed ring; the stabilizing component (8) comprises a fixed block (81), a tightening ball (82) and a tightening spring (83); a tightening hole (61) is opened on the rotating frame (6); the tightening ball (82) and the tightening spring (83) are both arranged in the tightening hole (61); the tightening spring (83) is located in the tightening hole (61) and the tightening spring (83) is located in the rotating frame (6). A first fixing rod (543) and a second fixing rod (544) are connected to the fixing plate (542) between the abutting ball (82) and the bottom wall of the abutting hole (61); the fixing block (81) is connected to the first fixing rod (543) and the second fixing rod (544); a fixing groove (811) matching the shape of the abutting ball (82) is formed on the fixing block (81); when the scrubbing wheel (7) is stabilized, the abutting ball (82) is located in the abutting groove (811); when the scrubbing wheel (7) is stabilized, the abutting ball (82) is located in the abutting groove (811) of the fixing block (81) on the first fixing rod (543); 2. A steel pipe welding device according to claim 1, characterized in that: The driving assembly (3) comprises a driving motor (31), a rotating gear (32) and a fixed rack (33); the base (1) is connected to a sliding rail (11); the mounting platform (2) is connected to a sliding seat; the sliding seat is slidably engaged on the sliding rail (11); the fixed rack (33) is connected to the sliding rail (11); the driving motor (31) is connected to the mounting platform (2); the rotating gear (32) is connected to the output shaft of the driving motor (31) and meshes with the fixed rack (33).

3. A steel pipe welding device according to claim 1, characterized in that: The brush strip (72) and the scraper (73) are both made of plastic material.

4. A steel pipe welding device according to claim 1, characterized in that: A protective layer is connected to the surface of the supporting roller (21).

5. A method for using a steel pipe welding device according to any one of claims 1 to 4, characterized in that: The steps include: S1, installing the steel pipe: placing the steel pipe on the supporting roller (21); S2, grinding the end of the steel pipe: using the grinding wheel (4) to grind the side wall of the welding end of the steel pipe; S3, initial welding of the steel pipes: using the welding gun (14) to spot weld the joint between the two steel pipes in coordination with the rotating steel pipes; S4, fully welded steel pipe: using the welding gun (14) to weld all the welds around the steel pipe; S5, grinding the weld: using the rotating member (41) to rotate the grinding wheel (4) in the opposite direction, so that the grinding wheel (4) grinds the weld.

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