A welding machine facilitating steel pipe welding

Abstract

The application is suitable for the technical field of welding equipment, and provides an electric welding machine facilitating steel pipe welding, which comprises a machine table, a clamping device and a welding device. The welding device comprises a welding gun and a displacement assembly for driving the welding gun to move. The displacement assembly comprises a first arc-shaped frame. The first arc-shaped frame is provided with a second arc-shaped frame sliding along the axial direction of the first arc-shaped frame and a first sliding seat sliding along the circumferential direction of the first arc-shaped frame. The second arc-shaped frame is provided with a second sliding seat sliding along the circumferential direction of the second arc-shaped frame. The second arc-shaped frame and the second sliding seat are simultaneously driven to slide by a screw rod. The helical line of the screw rod is configured to adjust the movement relationship between the second arc-shaped frame and the second sliding seat, so that the welding gun advances along the extension direction of the weld gap and reciprocally swings on both sides of the weld gap. In this way, the welding gun can be driven to advance along the weld gap to realize automatic welding, thereby reducing the cost and labor intensity of workers. Meanwhile, the welding gun can reciprocally swing during the advancing process to form fish scale patterns, thereby improving the welding strength.

Description

Technical Field

[0001] The invention belongs to the technical field of welding equipment, and in particular relates to an electric welder that is convenient for welding steel pipes. Background Art

[0002] Welding, also known as fusion, is a manufacturing process and technology that uses heat, high temperature, or high pressure to join metals or other thermoplastic materials such as plastics. Welding technology offers advantages such as reliable connections and low costs, and is widely used to connect steel pipes.

[0003] There are many forms of steel pipe connection, such as straight-line connection, T-shaped connection, etc. When two steel pipes are T-shaped connected, the weld is a complex spatial curve. Conventional equipment is difficult to complete complex spatial curve welding. Therefore, most companies still use manual welding to perform T-shaped connection of steel pipes. However, manual welding is costly and labor-intensive for workers. Summary of the Invention

[0004] The purpose of the embodiments of the present application is to provide an electric welder that is convenient for welding steel pipes, aiming to solve the problem that enterprises use manual welding to perform T-shaped butt joints of steel pipes, resulting in high welding costs and high labor intensity for workers.

[0005] The embodiment of the present application is implemented as follows: an electric welding machine for facilitating steel pipe welding, comprising:

[0006] Machine;

[0007] A clamping device is provided on the machine platform, and is used to clamp and position the first steel pipe and the second steel pipe so that the end of the second steel pipe intersects the middle of the first steel pipe to form a gap to be welded;

[0008] A welding device is provided on the machine platform, and two sets of the welding devices are provided. The two sets of welding devices are symmetrically arranged for welding the gaps to be welded on both sides of the second steel pipe; the welding device includes a welding gun and a displacement assembly for driving the welding gun to move, the displacement assembly includes a first arc frame, the first arc frame is provided with a second arc frame sliding along its axial direction and a first slide sliding along its circumferential direction, the second arc frame is provided with a second slide sliding along the circumference of the second arc frame, the first slide is rotatably provided with a screw, the second slide is provided with a nut member cooperating with the screw, and the welding gun moves following the second slide;

[0009] A linkage assembly, the linkage assembly includes a transmission gear fixed on the screw and a fixed tooth portion arranged along the circumference of the first arc-shaped frame, the transmission gear and the fixed tooth portion are meshed, and the screw is used to drive the second arc-shaped frame and the second slide to slide simultaneously, wherein the spiral line of the screw is configured to adjust the displacement relationship between the second arc-shaped frame and the second slide when they slide, so that the welding gun advances along the extension direction of the gap to be welded and swings back and forth on both sides of the gap to be welded.

[0010] In some preferred embodiments of the present application, the rotation axis of the screw is coincident with the Y axis of the plane rectangular coordinate system, and the helical line of the screw is unfolded along the outer circumference of the screw to form a first curve, and the first curve is a wavy line and extends along the second curve, wherein the expression of the second curve is , R is the radius of the first steel pipe and the second steel pipe.

[0011] In some preferred embodiments of the present application, the transmission gear includes a first gear and a second gear, the fixed tooth portion includes an inner tooth portion and an outer tooth portion, the inner tooth portion and the outer tooth portion are arranged alternately, and both are a quarter arc in length, the first gear and the inner tooth portion are meshed for transmission and have a first transmission ratio, the second gear and the outer tooth portion are meshed for transmission and have a second transmission ratio, and the first transmission ratio is equal to the second transmission ratio.

[0012] In some preferred embodiments of the present application, a first telescopic rod is movably provided on the second slide, the first telescopic rod is arranged along the radial direction of the first arc-shaped frame, one end of the first telescopic rod is used to abut the second steel pipe, and the other end is used to connect the welding gun, and a first elastic member for driving the first telescopic rod to abut the second steel pipe is provided between the second slide and the first telescopic rod.

[0013] In some preferred embodiments of the present application, the welding gun is fixedly connected to the first telescopic rod via a mounting bracket, the mounting bracket is provided with a wire reel for providing welding wire to the welding gun, and the mounting bracket is also provided with a driving assembly for driving the welding wire to move to enter the welding gun.

[0014] In some preferred embodiments of the present application, the driving assembly includes a driven roller and an active roller rotatably arranged on the mounting frame, the driven roller and the active roller are used to clamp the welding wire and drive the welding wire to move, and the active roller is connected to a power device.

[0015] In some preferred embodiments of the present application, the power device includes a second telescopic rod, a driving wheel and a transmission shaft. The second telescopic rod is movably inserted into the first slide and arranged along the first arc-shaped frame. The driving wheel is rotatably provided on the second telescopic rod and is used to abut the surface of the steel pipe. The transmission shaft is rotatably provided on the mounting frame and is connected to the active roller shaft. The transmission shaft and the driving wheel are connected by a belt drive. The driving wheel is used to roll on the second steel pipe to drive the active roller shaft to rotate.

[0016] In some preferred embodiments of the present application, a ball bearing is provided on the first telescopic rod, and the first telescopic rod abuts against the second steel pipe through the ball bearing.

[0017] In some preferred embodiments of the present application, the clamping device is provided with multiple sets, and the multiple sets of clamping devices are used to clamp the first steel pipe and the second steel pipe. The clamping device includes two V-shaped clamping blocks slidingly arranged on the machine table, and the two V-shaped clamping blocks are symmetrically arranged. The machine table is also provided with a clamping drive device that drives the two V-shaped clamping blocks to move toward each other.

[0018] In some preferred embodiments of the present application, the clamping drive device includes a first rack, a second rack, a connecting gear and a first motor. The first rack and the second rack are respectively fixed to two V-shaped clamping blocks. The connecting gear is rotatably arranged on the machine table. The first rack and the second rack are respectively engaged with both sides of the connecting gear. The first motor is used to drive the connecting gear to rotate.

[0019] An embodiment of the present application provides an electric welding machine that is convenient for welding steel pipes. The screw is used to drive the second arc frame and the second slide to slide simultaneously, and the spiral line of the screw is configured to adjust the movement relationship between the second arc frame and the second slide, so that the welding gun moves forward along the extension direction of the gap to be welded and swings back and forth on both sides of the gap to be welded. In this way, the welding gun can be driven to move forward along the gap to be welded to achieve automatic welding, reducing costs and labor intensity of workers, and can also swing back and forth during the forward movement to form fish scale patterns to improve welding strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic structural diagram of an electric welder for facilitating steel pipe welding provided in an embodiment of the present application;

[0021] Figure 2 Another structural schematic diagram of an electric welding machine for facilitating steel pipe welding provided in an embodiment of the present application;

[0022] Figure 3 for Figure 2 Schematic diagram of the structure of the welding device;

[0023] Figure 4 for Figure 2 Another structural schematic diagram of the welding device;

[0024] Figure 5 for Figure 4 Another structural schematic diagram of the welding device in;

[0025] Figure 6 This is a schematic structural diagram of the first curved frame according to an embodiment of the present application;

[0026] Figure 7 Schematic diagram of the first curve and the second curve in the embodiment of the present application.

[0027] in:

[0028] 10. First steel pipe; 11. Gap to be welded; 20. Second steel pipe; 30. Welding wire;

[0029] 100, machine;

[0030] 200, clamping device; 210, V-shaped clamping block; 220, connecting gear; 230, first rack; 240, second rack;

[0031] 300, welding device; 311, welding gun; 312, welding wire reel; 313, driven roller; 314, driving roller; 315, mounting frame; 316, transmission shaft; 320, first arc frame; 321, inner tooth portion; 322, outer tooth portion; 330, second arc frame; 340, second slide; 341, first telescopic rod; 342, first elastic member; 343, ball bearing; 350, first slide; 351, second telescopic rod; 352, second elastic member; 353, driving wheel; 354, belt; 355, sleeve; 356, second motor; 361, screw; 362, nut; 371, first gear; 372, second gear. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0033] The specific implementation of this application is described in detail below in conjunction with specific embodiments.

[0034] like Figure 1 1 is a schematic structural diagram of an electric welding machine for facilitating steel pipe welding provided in an embodiment of the present application, comprising: a machine platform 100, a clamping device 200, a welding device 300 and a linkage assembly.

[0035] like Figure 1 and Figure 2As shown, the clamping device 200 is provided on the machine 100 , and the clamping device 200 is used to clamp and position the first steel pipe 10 and the second steel pipe 20 so that the end of the second steel pipe 20 intersects with the middle of the first steel pipe 10 to form a weld gap 11 .

[0036] like Figure 1 、 Figure 3 and Figure 4 As shown, the welding device 300 is provided on the machine 100, and the welding device 300 is provided with two sets. The two sets of welding devices 300 are symmetrically arranged for welding the gap 11 to be welded on both sides of the second steel pipe 20; the welding device 300 includes a welding gun 311 and a displacement assembly that drives the welding gun 311 to move, and the displacement assembly includes a first arc frame 320, the first arc frame 320 is provided with a second arc frame 330 that slides along its axial direction and a first slide 350 that slides along its circumferential direction, the second arc frame 330 is provided with a second slide 340 that slides circumferentially along the second arc frame 330, the first slide 350 is rotatably provided with a screw 361, and the second slide 340 is provided with a nut 362 that cooperates with the screw 361, and the welding gun 311 moves following the second slide 340. It should be noted that Figure 1 Only one set of welding devices 300 is shown, which is used to weld the seam system 11 facing the side outside the paper.

[0037] The linkage assembly includes a transmission gear fixed on the screw 361 and a fixed tooth portion arranged along the circumference of the first arc frame 320. The transmission gear and the fixed tooth portion are engaged for transmission. The screw 361 is used to drive the second arc frame 330 and the second slide 340 to slide simultaneously, wherein the spiral line of the screw 361 is configured to adjust the displacement relationship between the second arc frame 330 and the second slide 340 during sliding, so that the welding gun 311 advances along the extension direction of the gap 11 to be welded and swings back and forth on both sides of the gap 11 to be welded.

[0038] In this embodiment, the first steel pipe 10 and the second steel pipe 20 are T-jointed and clamped in place by the clamping device 200 to facilitate subsequent welding. The second curved frame 330 can slide axially along the first curved frame 320, while the second slide 340 is mounted on the second curved frame 330 and can move circumferentially along the second curved frame 330. In this way, by simply controlling the motion relationship between the second curved frame 330 and the second slide 340, the welding gun 311 can be positioned at any position on the surface of the second steel pipe 20. The welding gun 311 can also be moved along the gap 11 to be welded, thereby achieving automatic welding and reducing costs and worker workload.

[0039] Specifically, a screw 361 can be used to adjust the motion relationship between the second arc frame 330 and the second slide 340. In this embodiment, when the screw 361 rotates at a constant speed, the meshing of the transmission gear and the fixed teeth enables the screw 361 and the second slide 340 to move at a constant speed along the circumference of the first arc frame 320. By configuring different helical lines for the screw 361, the axial motion of the second slide 340 and the welding gun 311 can be controlled to follow different curves, and of course, can also achieve movement that conforms to the gap 11 to be welded. In addition, while the welding gun 311 moves along the gap 11 to be welded, the pitch of the helical line can be adjusted. For example, by slightly increasing the pitch of the odd-numbered turns and slightly decreasing the pitch of the even-numbered turns, the welding gun 311 can be caused to swing forward along the direction of the gap 11 to be welded.

[0040] In some embodiments, the first arc-shaped frame 320 is provided with a first slide 350 that slides along its circumference, and the screw 361 is rotatably arranged on the first slide 350, so that the screw 361 can move along with the second slide 340 without causing motion interference. In some embodiments, the nut 362 is a needle-shaped structure, and a spiral groove is opened along the spiral line on the screw 361. The needle tip of the nut 362 abuts against the spiral groove of the screw 361. The use of a needle-shaped nut 362 can reduce the required width of the spiral groove, thereby being able to open a spiral groove with a small pitch on the screw 361. Figure 4 As shown, in some embodiments of the present application, a second motor 356 for driving the screw 361 to rotate is provided on the first slide 350, and the output shaft of the second motor 356 and the screw 361 are driven by gears, so that the screw 361 can be driven to rotate by the second motor 356.

[0041] like Figure 7 As shown in FIG. 1 , as a preferred embodiment of the present application, the rotation axis of the screw 361 is aligned with the Y axis of the plane rectangular coordinate system, and the spiral line of the screw 361 is unfolded along the outer circumference of the screw 361 to form a first curve. The first curve is a wavy line and extends along the second curve. The expression of the second curve is: , R is the radius of the first steel pipe 10 and the second steel pipe 20. It should be noted that the electric welding machine of this embodiment is used for welding the first steel pipe 10 and the second steel pipe 20 with the same diameter. In addition, when welding steel pipes of different diameters, the screw needs to be replaced accordingly.

[0042] In this embodiment, the second curve adopts the cosine function to better fit the weld gap 11. Specifically, Figure 1As shown, in some embodiments, the welding gun 311 welds from the middle of the top of the second steel pipe 20 to the side. When the screw 361 rotates at a constant speed, the transmission gear on the screw 361 engages with the fixed tooth portion, so that the screw 361 and the second slide 340 make a uniform circular motion along the first arc frame 320. If the helix of the screw 361 is of equal pitch, the second slide 340 will drive the welding gun 311 to move axially at a constant speed, and the welding gun 311 will not be able to move along the trajectory of the gap 11 to be welded. The helix obtained by winding the screw 361 with a cosine function has a larger pitch at the beginning, and then the pitch gradually decreases and eventually approaches zero, which just fits the trajectory of the gap 11 to be welded. Figure 1 As shown, in the quarter-circle of the gap to be welded 11 from the top to the side of the second steel pipe 20, the distance required to move from the top is large, and when moving to the side of the second steel pipe 20, the distance required for axial movement approaches zero, which is consistent with the movement law of the cosine function. Therefore, the second curve using the cosine function can better fit the gap to be welded 11, so that the welding gun 311 moves along the gap to be welded 11. In addition, the spiral line of the screw 361 is expanded to form a first curve, and the first curve is a wavy line and extends along the second curve. In this way, while the welding gun 311 moves along the gap to be welded 11, it can swing on both sides of the gap to be welded 11 to form fish scale patterns, thereby improving the welding strength, and no other driving device is required to drive the welding gun 311 to swing separately. It should be noted that Figure 7 The number of waves is for demonstration purposes only and is not intended to limit the present application. The number of waves may be selected according to the welding process during implementation.

[0043] like Figure 4 and Figure 6 As shown, as a preferred embodiment of the present application, the transmission gear includes a first gear 371 and a second gear 372, the fixed tooth portion includes an inner tooth portion 321 and an outer tooth portion 322, the inner tooth portion 321 and the outer tooth portion 322 are arranged alternately, and the length of both is a quarter arc, the first gear 371 and the inner tooth portion 321 are engaged in transmission and have a first transmission ratio, the second gear 372 and the outer tooth portion 322 are engaged in transmission and have a second transmission ratio, and the first transmission ratio is equal to the second transmission ratio.

[0044] In some embodiments, as Figure 1As shown, when the welding gun 311 is welding toward the gap 11 to be welded on the outside of the paper, the welding gun 311 needs to move to the right first and then to the left, that is, the direction of the screw 361 needs to be adjusted. In this embodiment, at the beginning, the first gear 371 and the inner tooth portion 321 are internally meshed, and then when the second motor 356 drives the screw 361 to rotate in the opposite direction, the first gear 371 and the inner tooth portion 321 are disengaged, and the second gear 372 and the outer tooth portion 322 are externally meshed, so that the screw 361 and the second slide 340 can continue to move circumferentially along the first arc frame 320. In addition, the transmission ratio of the two is kept the same to ensure that the relationship between the circumferential movement of the screw 361 and the rotation speed of the screw 361 remains unchanged. In some embodiments, the number of teeth of the first gear 371 and the number of teeth of the second gear 372 are adjusted so that the tooth ratio of the meshing of the first gear 371 and the inner tooth portion 321 is the same as the tooth ratio of the second gear 372 and the outer tooth portion 322, thereby achieving the first transmission ratio being equal to the second transmission ratio.

[0045] like Figure 3 and Figure 4 As shown, as a preferred embodiment of the present application, the second slide 340 is movably provided with a first telescopic rod 341, and the first telescopic rod 341 is arranged along the radial extension of the second arc frame 330. One end of the first telescopic rod 341 is used to abut the second steel pipe 20, and the other end is used to connect the welding gun 311. A first elastic member 342 for driving the first telescopic rod 341 to abut the second steel pipe 20 is provided between the second slide 340 and the first telescopic rod 341.

[0046] In this embodiment, the first telescopic rod 341 abuts the second steel pipe 20, allowing the height of the welding gun 311 to be adjusted so that the welding gun 311 conforms to the surface of the second steel pipe 20. In some embodiments, the nozzle of the welding gun 311 is at the same height as the end of the first telescopic rod 341 closest to the second steel pipe 20. This allows the nozzle of the welding gun 311 to naturally rest on the surface of the second steel pipe 20 when the first telescopic rod 341 abuts the second steel pipe 20, facilitating subsequent welding. In some embodiments, the first elastic member 341 is a spring or a gas strut.

[0047] like Figure 4 As shown in FIG. 3 , as a preferred embodiment of the present application, the welding gun 311 is fixedly connected to the first telescopic rod 341 via a mounting bracket 315. The mounting bracket 315 is provided with a wire reel 312 for supplying welding wire 30 to the welding gun 311. The mounting bracket 315 is also provided with a drive assembly for driving the welding wire 30 to move and enter the welding gun 311. In this embodiment, the wire reel 312 is mounted on the mounting bracket 315 to move with the welding gun 311, thereby preventing the welding wire 30 from entangled with the equipment.

[0048] like Figure 4As shown in FIG. 1 , as a preferred embodiment of the present application, the drive assembly includes a driven roller 313 and a driving roller 314 rotatably mounted on the mounting frame 315 . The driven roller 313 and the driving roller 314 are used to clamp the welding wire 30 and drive the welding wire 30 to move. The driving roller 314 is connected to a power device. In this embodiment, the driven roller 313 and the driving roller 314 clamp the welding wire 30 and drive the welding wire 30 to move, thereby enabling stable feeding of the welding gun 311.

[0049] like Figure 4 and Figure 5 As shown, as a preferred embodiment of the present application, the power device includes a second telescopic rod 351, a driving wheel 353 and a transmission shaft 316. The second telescopic rod 351 is movably inserted into the first slide 350 and is arranged radially along the first arc frame 320. The driving wheel 353 is rotatably provided on the second telescopic rod 351 and is used to abut the surface of the steel pipe. The transmission shaft 316 is rotatably provided on the mounting frame 315 and is transmission-connected to the active roller shaft 314. The transmission shaft 316 and the driving wheel 353 are transmission-connected via a belt drive. The driving wheel 353 is used to roll on the second steel pipe 20 to drive the active roller shaft 314 to rotate.

[0050] In this embodiment, when the welding gun 311 moves, the driving wheel 353 rolls close to the surface of the second steel pipe 20, and the rotational motion of the driving wheel 353 is transmitted to the transmission shaft 316 through the belt drive. The transmission shaft 316 drives the active roller shaft 314 to rotate to realize the loading of the welding wire 30. In this way, the welding wire 30 will only be loaded when the welding gun 311 moves, avoiding excessive loading of the welding wire 30 at the same position.

[0051] like Figure 4 and Figure 5 As shown, in some embodiments, a sleeve 355 is rotatably mounted on the end of the second telescopic rod 351 away from the drive wheel 353. The sleeve 355 is slidably mounted on the transmission shaft 316. The transmission shaft 316 is provided with a slot, and the sleeve 355 has a stopper that slides in the slot. The sleeve 355 can slide along the axial direction of the transmission shaft 316, and when the sleeve 355 rotates, it can drive the transmission shaft 316 to rotate. In this way, connecting the end of the second telescopic rod 351 away from the drive wheel 353 to the transmission shaft 316 improves the stability of the second telescopic rod.

[0052] In some embodiments, the drive wheel 353 is coaxially fixedly coupled to a pulley, and the sleeve 355 is also coaxially fixedly coupled to a pulley. A belt 354 is disposed between the two pulleys to transmit motion. In some embodiments, the transmission shaft 316 and the active roller shaft 314 are connected via a universal joint to facilitate motion transmission between the two shafts at an angle. In some embodiments, a second elastic member 352 is disposed between the second telescopic rod 351 and the first slide 350. The second elastic member 352 drives the drive wheel 353 on the second telescopic rod 351 to compress the second steel pipe 20.

[0053] like Figure 4 As shown, as a preferred embodiment of the present application, a ball 343 is provided on the first telescopic rod 341, and the first telescopic rod 341 abuts the second steel pipe 20 through the ball 343. In this embodiment, the first telescopic rod 341 abuts the second steel pipe 20 through the ball 343, which can reduce movement friction.

[0054] like Figure 1 and Figure 2 As shown, as a preferred embodiment of the present application, the clamping device 200 is provided with multiple sets, and the multiple sets of clamping devices 200 are used to clamp the first steel pipe 10 and the second steel pipe 20. The clamping device 200 includes two V-shaped clamping blocks 210 slidingly arranged on the machine platform, and the two V-shaped clamping blocks 210 are symmetrically arranged. The machine platform 100 is also provided with a clamping drive device for driving the two V-shaped clamping blocks 210 to move toward each other.

[0055] In this embodiment, the first steel pipe 10 and the second steel pipe 20 are clamped by the opposite movement of the two V-shaped clamping blocks 210, which can center the steel pipes and ensure that steel pipes of different diameters can be clamped to the same height, facilitating the welding work of the welding device 300.

[0056] like Figure 2 As shown, as a preferred embodiment of the present application, the clamping drive device includes a first rack 230, a second rack 240, a connecting gear 220 and a first motor. The first rack 230 and the second rack 240 are respectively fixed to the two V-shaped clamping blocks 210, and the connecting gear 220 is rotatably arranged on the machine 100. The first rack 230 and the second rack 240 are respectively engaged with the two sides of the connecting gear 220, and the first motor is used to drive the connecting gear 220 to rotate.

[0057] In this embodiment, by connecting the gear 220 and driving the first rack 230 and the second rack 240 to move at the same time, the two V-shaped clamps 210 can move simultaneously to clamp the first steel pipe 10 or the second steel pipe 20, ensuring that the two steel pipes are clamped in the middle position, thereby improving the centering effect.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An electric welder for welding steel pipes, characterized in that: include: Machine; A clamping device is provided on the machine platform, and is used to clamp and position the first steel pipe and the second steel pipe so that the end of the second steel pipe intersects the middle of the first steel pipe to form a gap to be welded; A welding device is provided on the machine platform, and two sets of the welding devices are provided. The two sets of welding devices are symmetrically arranged for welding the gaps to be welded on both sides of the second steel pipe; the welding device includes a welding gun and a displacement assembly for driving the welding gun to move, the displacement assembly includes a first arc frame, the first arc frame is provided with a second arc frame sliding along its axial direction and a first slide sliding along its circumferential direction, the second arc frame is provided with a second slide sliding along the circumference of the second arc frame, the first slide is rotatably provided with a screw, the second slide is provided with a nut member cooperating with the screw, and the welding gun moves following the second slide; a linkage assembly comprising a transmission gear fixed to the screw and a fixed tooth portion arranged along the circumference of the first arc-shaped frame, the transmission gear and the fixed tooth portion being meshed with each other, the screw being used to drive the second arc-shaped frame and the second slide to slide simultaneously, wherein the helical line of the screw is configured to adjust the displacement relationship between the second arc-shaped frame and the second slide when they slide, so that the welding gun advances along the extension direction of the gap to be welded and reciprocates on both sides of the gap to be welded; The rotating axis of the screw is aligned with the Y axis of the plane rectangular coordinate system. The spiral line of the screw is unfolded along the outer circumference of the screw to form a first curve. The first curve is a wavy line and extends along the second curve. The expression of the second curve is: , R is the radius of the first steel pipe and the second steel pipe; A first telescopic rod is movably provided on the second slide, the first telescopic rod being arranged radially along the first arc-shaped frame, one end of the first telescopic rod being used to abut the second steel pipe, and the other end being used to connect to the welding gun, and a first elastic member being provided between the second slide and the first telescopic rod for driving the first telescopic rod to abut the second steel pipe; The welding gun is fixedly connected to the first telescopic rod via a mounting bracket, the mounting bracket being provided with a wire reel for supplying welding wire to the welding gun, and the mounting bracket being further provided with a drive assembly for driving the welding wire to move into the welding gun; The drive assembly includes a driven roller and an active roller that are rotatably mounted on the mounting frame, the driven roller and the active roller being used to clamp the welding wire and drive the welding wire to move, the active roller being connected to a power device; The power device includes a second telescopic rod, a driving wheel and a transmission shaft. The second telescopic rod is movably installed on the first slide and is arranged along the radial direction of the first arc-shaped frame. The driving wheel is rotatably installed on the second telescopic rod and is used to abut the surface of the steel pipe. The transmission shaft is rotatably installed on the mounting frame and is connected to the active roller shaft. The transmission shaft and the driving wheel are connected by a belt drive. The driving wheel is used to roll on the second steel pipe to drive the active roller shaft to rotate.

2. The electric welder for steel pipe welding according to claim 1, characterized in that: The transmission gear includes a first gear and a second gear, the fixed tooth portion includes an inner tooth portion and an outer tooth portion, the inner tooth portion and the outer tooth portion are arranged alternately, and both have a length of a quarter arc, the first gear and the inner tooth portion are meshed for transmission and have a first transmission ratio, the second gear and the outer tooth portion are meshed for transmission and have a second transmission ratio, and the first transmission ratio is equal to the second transmission ratio.

3. The electric welder for facilitating steel pipe welding according to claim 1, characterized in that: A ball bearing is provided on the first telescopic rod, and the first telescopic rod abuts against the second steel pipe through the ball bearing.

4. The electric welder for facilitating steel pipe welding according to claim 1, characterized in that: The clamping device is provided with multiple sets, and the multiple sets of clamping devices are used to clamp the first steel pipe and the second steel pipe. The clamping device includes two V-shaped clamping blocks slidingly arranged on the machine platform, and the two V-shaped clamping blocks are symmetrically arranged. The machine platform is also provided with a clamping drive device that drives the two V-shaped clamping blocks to move toward each other.

5. The electric welder for facilitating steel pipe welding according to claim 4, characterized in that: The clamping drive device includes a first rack, a second rack, a connecting gear and a first motor. The first rack and the second rack are respectively fixed to two V-shaped clamping blocks. The connecting gear is rotatably arranged on the machine table. The first rack and the second rack are respectively engaged with both sides of the connecting gear. The first motor is used to drive the connecting gear to rotate.

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