Pipe welding apparatus

Abstract

The present application belongs to the technical field of pipe welding, and relates to a pipe welding device. After a pushing device is extruded by an electrode pushing device, the through hole diameter of a first limiting device and a second limiting device is changed. The first limiting device controls the through hole diameter of a sliding cavity, and the second limiting device controls the through hole diameter of the connection between the sliding cavity and an electrode storage cavity. A transmission device and an auxiliary wheel are attached to the surface of the pipe. When the pipe welding device and the welding position form a relative position, the transmission device drives the electrode pushing device of the oiling electrode to move towards the welding position through the position adjusting device. The speed at which the electrode pushing device drives the electrode to move is proportional to the speed at which the pipe welding device and the pipe rotate. This ensures that the same amount of electrode is required for each welding point, thereby ensuring the uniformity of the welding points. Then, the pushing device can be extruded according to the position of the electrode pushing device to change the through hole diameter of the first limiting device and the second limiting device, thereby replacing the electrode.

Description

Technical Field

[0001] This invention belongs to the field of pipe welding technology, and particularly relates to a pipe welding device. Background Technology

[0002] Pipes are ubiquitous in modern life, from large oil and gas pipelines to small tap water pipelines. Pipes are involved in the transmission of these fluids. The aforementioned pipelines are all made by welding together multiple sections of pipe.

[0003] The existing welding methods involve manual welding by workers, which places extremely high demands on the workers' skill level. Unskilled workers can easily cause uneven welds or even defects. Summary of the Invention

[0004] The purpose of this invention is to provide a pipe welding device to solve the technical problem of uneven distribution of weld points at the welding joint.

[0005] To achieve the above objectives, the specific technical solution of the pipe welding device of the present invention is as follows:

[0006] A pipe welding apparatus includes an installation cylinder, a transmission device, an auxiliary wheel, and a welding rod pushing device. The installation cylinder is equipped with a transmission device and an auxiliary wheel that contact the pipe. Inside the installation cylinder is a welding rod pushing device for moving the welding rod. The apparatus is characterized by having a position adjustment device inside the installation cylinder. The transmission device drives the welding rod pushing device to move within a sliding cavity inside the installation cylinder via the position adjustment device. The installation cylinder contains a first pushing device, a first limiting device, and a second limiting device. The installation cylinder also contains a welding rod storage cavity communicating with the sliding cavity. When the first pushing device is squeezed by the welding rod pushing device, it changes the through-hole diameter of the first and second limiting devices. The first limiting device controls the through-hole diameter of the sliding cavity, and the second limiting device controls the through-hole diameter at the connection between the sliding cavity and the welding rod storage cavity.

[0007] Furthermore, a guide tube is provided inside the electrode storage cavity.

[0008] Furthermore, the transmission device includes a mounting plate, a mounting base, a transmission wheel, a first transmission shaft, a first bevel gear, a second transmission shaft, a second bevel gear, and a first gear. The mounting plate and the mounting base are mounted on the mounting cylinder. The first transmission shaft is mounted on the mounting base, and the second transmission shaft is mounted on the mounting plate. The first transmission shaft is provided with a transmission wheel and a first bevel gear, and the second transmission shaft is provided with a second bevel gear and a first gear. The first bevel gear and the second bevel gear mesh, and the first gear drives the position adjustment device.

[0009] Furthermore, the position adjustment device includes a sliding mounting groove, a transmission gear ring, a second gear, a threaded rod, and a movable threaded block. The sliding mounting groove is disposed on the mounting cylinder, the transmission gear ring slides inside the sliding mounting groove, the threaded rod is disposed inside the mounting cylinder, and the threaded rod is provided with a second gear. The second gear is connected to the first gear through the transmission gear ring, and the welding rod pushing device is disposed on the movable threaded block.

[0010] Furthermore, the electrode pushing device includes a first moving ring, a through hole, a first pressing ring, a first connecting rod, a pushing gear, a second pressing ring, a second connecting rod, a transmission gear, a rotating screw, a threaded clamping block, and a limiting device. The first moving ring is disposed on the moving threaded block, the through hole is disposed on the first moving ring, the pushing gear slides inside the first moving ring, the pushing gear is provided with a first connecting rod and a second connecting rod, the first pressing ring is disposed on the first connecting rod, the second pressing ring is disposed on the second connecting rod, the rotating screw is disposed inside the first moving ring, the rotating screw is provided with a transmission gear that cooperates with the pushing gear, three threaded clamping blocks are slidably disposed inside the first moving ring, the threaded clamping blocks cooperate with the rotating screw, and a limiting device is provided inside the first moving ring to limit the first connecting rod and the second connecting rod. The first moving ring presses the first pushing device through the first pressing ring or the second pressing ring.

[0011] Furthermore, a guide ring is provided at the upper end of the first moving ring.

[0012] Furthermore, the limiting device includes a limiting sliding cavity, a second moving ring, a first spring, a ball-end post, a limiting bolt, a second spring, a limiting hole, and a receiving groove. The limiting sliding cavity is disposed inside the second moving ring, and the ball-end post slides within the limiting sliding cavity via the second moving ring. The first spring is disposed between the limiting sliding cavity and the second moving ring, and the limiting bolt slides inside the ball-end post. A second spring is provided between the limiting bolt and the ball-end post. Limiting holes are provided on both the first connecting rod and the second connecting rod. A receiving groove for receiving the ball end of the ball-end post is disposed on the second moving ring and communicates with the sliding cavity.

[0013] Furthermore, the first pushing device includes a connecting rod, a first extrusion strip, and a second extrusion strip. The connecting rod slides inside the mounting cylinder. One end of the connecting rod is provided with the first extrusion strip, and the other end is provided with the second extrusion strip. The first extrusion strip is extruded by the first extrusion ring, and the second extrusion strip is extruded by the second extrusion ring. The moving connecting rod changes the through-hole diameter of the first limiting device and the second limiting device.

[0014] Furthermore, the first limiting device includes a first inclined block, a first compressed block, a first push plate and a first return spring. The first compressed block is provided with first push plates on both sides, and the first push plate is provided with a first return spring. The first compressed block slides inside the mounting cylinder. The connecting rod squeezes the first compressed block towards the center through the first inclined block. The spiral plate is provided inside the rotating cylinder, and the discharge pipe is provided inside the mixing cylinder. The discharge pipe is placed inside the pushing spiral plate.

[0015] Furthermore, the second limiting device includes a second inclined block, a second compressed block, a second push plate, and a second return spring. The second compressed block is provided with second push plates on both sides, and a second return spring is provided on the second push plate. The second compressed block slides inside the mounting cylinder. The connecting rod squeezes the second compressed block towards the center through the second inclined block. The front end of the second compressed block is provided with an inclined surface.

[0016] The advantages of this invention are:

[0017] This invention uses a transmission device and an auxiliary wheel attached to the surface of the pipe. When the pipe welding device and the welding point are in a relative position, the transmission device drives the electrode pushing device of the welding electrode to move towards the welding point in the mounting cylinder through the position adjustment device. The speed at which the electrode pushing device moves the electrode is proportional to the rotation speed between the welding device and the pipe. This ensures that the same welding electrode is required for each weld point, thus guaranteeing the uniformity of the weld point. Then, the pushing device can be squeezed according to its position, thereby driving the first and second limiting devices to change the electrode by changing the aperture. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 Cross-sectional view of the overall structure of the present invention Figure 1 ;

[0020] Figure 3 Cross-sectional view of the overall structure of the present invention Figure 2 ;

[0021] Figure 4 This is a schematic diagram of the transmission device structure of the present invention;

[0022] Figure 5 This is a schematic diagram of the position adjustment device of the present invention;

[0023] Figure 6 This is a schematic diagram of the storage slot structure of the present invention;

[0024] Figure 7 This is a schematic diagram of the pushing device structure of the present invention;

[0025] Figure 8 This is a schematic diagram of the structure of the first electrode pushing device of the present invention;

[0026] Figure 9 This is a cross-sectional view of the electrode pushing device of the present invention;

[0027] Figure 10 for Figure 9 Detailed enlarged diagram A;

[0028] Figure 11 This is a partial structural diagram of the electrode pushing device of the present invention;

[0029] Explanation of markings in the diagram:

[0030] Mounting cylinder 1; Transmission device 2; Mounting plate 2-1; Mounting base 2-2; Transmission wheel 2-3; First transmission shaft 2-4; First bevel gear 2-5; Second transmission shaft 2-6; Second bevel gear 2-7; First gear 2-8; Auxiliary wheel 3; Position adjustment device 4; Sliding mounting groove 4-1; Transmission gear ring 4-2; Second gear 4-3; Threaded rod 4-4; Moving threaded block 4-5; Welding electrode pushing device 5; First moving ring 5-1; Through hole 5-2; First compression ring 5-3; First connecting rod 5-4; Pushing gear frame 5-5; Second connecting rod 5-6; Second compression ring 5-7; Transmission gear 5-8; Rotating screw 5-9; Threaded clamping block 5-10; Limiting device 5-11; Limiting Sliding cavity 5-11-1; Second moving ring 5-11-2; First spring 5-11-3; Ball end post 5-11-4; Restricting bolt 5-11-5; Second spring 5-11-6; Restricting hole 5-11-7; Storage groove 5-11-8; First pushing device 6; Connecting rod 6-1; First extrusion bar 6-2; Second extrusion bar 6-3; First limiting device 7; First inclined block 7-1; First extruded block 7-2; First push plate 7-3; First return spring 7-4; Second limiting device 8; Second inclined block 8-1; Second extruded block 8-2; Second push plate 8-3; Second return spring 8-4; Inclined 8-5; Guide tube 9; Sliding cavity 10; Welding electrode storage cavity 11; Guide tube 9. Detailed Implementation

[0031] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] like Figure 1-11 As shown, a pipe welding device includes an installation cylinder 1, a transmission device 2, an auxiliary wheel 3, and a welding rod pushing device 5. The installation cylinder 1 is equipped with the transmission device 2 and the auxiliary wheel 3 that contact the pipe. The installation cylinder 1 is equipped with a welding rod pushing device 5 for driving the welding rod to move. The device is characterized in that the installation cylinder 1 is equipped with a position adjustment device 4. The transmission device 2 drives the welding rod pushing device 5 to move in a sliding cavity 10 inside the installation cylinder 1 through the position adjustment device 4. The installation cylinder 1 is equipped with a first pushing device 6, a first limiting device 7, and a second limiting device 8. The installation cylinder 1 is equipped with a welding rod storage cavity 11 that communicates with the sliding cavity 10. When the first pushing device 6 is squeezed by the welding rod pushing device 5, it will change the through diameter of the first limiting device 7 and the second limiting device 8. The first limiting device 7 controls the through diameter of the sliding cavity 10, and the second limiting device 8 controls the through diameter at the connection between the sliding cavity 10 and the welding rod storage cavity 11.

[0034] The transmission device 2 and the auxiliary wheel 3 are attached to the surface of the pipe. When the pipe welding device and the welding point are in a relative position, the transmission device 2 will drive the welding rod pushing device 5 to move towards the welding point in the mounting cylinder 1 through the position adjustment device 4. The speed at which the welding rod is moved by the welding rod pushing device 5 is proportional to the rotation speed between the welding device and the pipe. This ensures that the welding rod required for each weld point is the same, thus guaranteeing the uniformity of the weld point. Then, the first pushing device 6 can be squeezed according to the position of the welding rod pushing device 5, thereby driving the first limiting device 7 and the second limiting device 8 to change the through-hole diameter to replace the welding rod.

[0035] Among them, such as Figure 1-11 As shown, the electrode storage cavity 11 is provided with a guide tube 9.

[0036] Among them, such as Figure 1-11As shown, the transmission device 2 includes a mounting plate 2-1, a mounting base 2-2, a transmission wheel 2-3, a first transmission shaft 2-4, a first bevel gear 2-5, a second transmission shaft 2-6, a second bevel gear 2-7, and a first gear 2-8. The mounting plate 2-1 and the mounting base 2-2 are mounted on the mounting cylinder 1. The first transmission shaft 2-4 is mounted on the mounting base 2-2, and the second transmission shaft 2-6 is mounted on the mounting plate 2-1. The first transmission shaft 2-4 is equipped with the transmission wheel 2-3 and the first bevel gear 2-5, and the second transmission shaft 2-6 is equipped with the second bevel gear 2-7 and the first gear 2-8. The first bevel gear 2-5 and the second bevel gear 2-7 mesh, and the first gear 2-8 drives the position adjustment device 4.

[0037] When the pipe size is small, the transmission wheel 2-3 can be rotated by rotating the pipe. When the pipe size is too large, the welding device can be rotated around the pipe by the first transmission shaft 2-4. The rotating transmission wheel 2-3 will rotate through the first bevel gear 2-5. The first bevel gear 2-5 drives the first gear 2-8 set on the second transmission shaft 2-6 to rotate through the second bevel gear 2-7. The first gear 2-8 drives the position adjustment device 4.

[0038] Among them, such as Figure 1-11 As shown, the position adjustment device 4 includes a sliding mounting groove 4-1, a transmission gear ring 4-2, a second gear 4-3, a threaded rod 4-4, and a movable threaded block 4-5. The sliding mounting groove 4-1 is disposed on the mounting cylinder 1. The transmission gear ring 4-2 slides inside the sliding mounting groove 4-1. The threaded rod 4-4 is disposed inside the mounting cylinder 1. The threaded rod 4-4 is provided with the second gear 4-3. The second gear 4-3 is connected to the first gear 2-8 through the transmission gear ring 4-2. The welding rod pushing device 5 is disposed on the movable threaded block 4-5.

[0039] The rotating first gear 2-8 drives the transmission gear ring 4-2 to rotate. The transmission gear ring 4-2 drives the threaded rod 4-4 to rotate through the second gear 4-3. The threaded rod 4-4 causes the movable threaded block 4-5 to move, which pulls the transmission gear ring 4-2 to slide inside the sliding mounting groove 4-1, causing the transmission gear ring 4-2 and the first gear 2-8 to disengage.

[0040] Among them, such as Figure 1-11As shown, the electrode pushing device 5 includes a first moving ring 5-1, a through hole 5-2, a first pressing ring 5-3, a first connecting rod 5-4, a pushing gear 5-5, a second pressing ring 5-7, a second connecting rod 5-6, a transmission gear 5-8, a rotating screw 5-9, a threaded clamping block 5-10, and a limiting device 5-11. The first moving ring 5-1 is mounted on the moving threaded block 4-5, and the through hole 5-2 is mounted on the first moving ring 5-1. The pushing gear 5-5 slides inside the first moving ring 5-1. The pushing gear 5-5 is equipped with a first connecting rod 5-4 and a second connecting rod 5-6. The first pressing ring 5-3... The first connecting rod 5-4 is provided with a first compression ring 5-7, which is provided with a second compression ring 5-7, which is provided with a second connecting rod 5-6, and a rotating screw 5-9 is provided inside the first moving ring 5-1. The rotating screw 5-9 is provided with a transmission gear 5-8 that cooperates with the push gear frame 5-5. Three threaded clamping blocks 5-10 are slidably provided inside the first moving ring 5-1. The threaded clamping blocks 5-10 cooperate with the rotating screw 5-9. The first moving ring 5-1 is provided with a limiting device 5-11 that limits the first connecting rod 5-4 and the second connecting rod 5-6. The first moving ring 5-1 compresses the first pushing device 6 through the first compression ring 5-3 or the second compression ring 5-7.

[0041] The moving threaded block 4-5 drives the first moving ring 5-1 to move. The first moving ring 5-1, by moving the internal components, simultaneously moves the welding rod, causing it to melt and adhere to the welding point. When the first moving ring 5-1 moves to contact and press the first extrusion ring 5-3 and the first pushing device 6, the lower limiting device 5-11 releases the restriction on the first connecting rod 5-4, causing relative movement between the first extrusion ring 5-3 and the first moving ring 5-1. The first extrusion ring 5-3 drives the pushing gear 5-5 to move upwards inside the first moving ring 5-1. The moving first moving ring 5-1 drives the second extrusion ring 5-7 and the second connecting rod 5-6 to move, causing the second connecting rod 5-6 to move to the limiting device 5-11, which restricts its movement. During the movement of the pushing gear 5-5, the pushing gear 5-5 drives the rotating screw 5-9 to rotate via the transmission gear 5-8, causing the threaded clamping block 5-10 to retract into the first moving ring 5-1, thus forming a closed loop. The aperture of the first moving ring 5-1 is larger than the diameter of the welding section of the electrode, so that the bottom that cannot be welded without the electrode is detached. At the same time, the first moving ring 5-1 squeezes the first pushing device 6 through the first squeezing ring 5-3. The squeezed first pushing device 6 makes the aperture formed by the first limiting device 7 smaller than the maximum diameter of the electrode, preventing newly added electrodes from falling directly out of the sliding cavity 10 from the first limiting device 7. Meanwhile, the aperture formed by the second limiting device 8 is larger than the diameter of the electrode, so that new electrodes are added into the sliding cavity 10. When there is After the new welding rod is replenished, the first moving ring 5-1 moves in the opposite direction by rotating the transmission gear ring 4-2. When the first moving ring 5-1 moves to press against the upper end of the first pushing device 6, the limiting device 5-11 releases the restriction on the second connecting rod 5-6, causing the pushing gear 5-5 to move downward inside the first moving ring 5-1. The moving pushing gear 5-5 drives the threaded clamping block 5-10 to clamp the tail of the welding rod. At the same time, the first limiting device 7 expands to allow the welding rod to pass through, and the second limiting device 8 shrinks to allow the welding rod to pass through.

[0042] Among them, such as Figure 1-11 As shown, the first moving ring 5-1 has a guide ring 5-12 at its upper end.

[0043] Among them, such as Figure 1-11As shown, the limiting device 5-11 includes a limiting sliding cavity 5-11-1, a first and second moving rings 5-11-2, a first spring 5-11-3, a ball-end post 5-11-4, a limiting bolt 5-11-5, a second spring 5-11-6, a limiting hole 5-11-7, and a receiving groove 5-11-8. The limiting sliding cavity 5-11-1 is disposed inside the first moving ring 5-1. The ball-end post 5-11-4 slides inside the limiting sliding cavity 5-11-1 via the first and second moving rings 5-11-2. A spring 5-11-3 is disposed between the limiting sliding cavity 5-11-1 and the first and second moving rings 5-11-2. A limiting bolt 5-11-5 slides inside the ball end post 5-11-4. A second spring 5-11-6 is disposed between the limiting bolt 5-11-5 and the ball end post 5-11-4. Both the first connecting rod 5-4 and the second connecting rod 5-6 are provided with limiting holes 5-11-7. A receiving groove 5-11-8 for receiving the ball end of the ball end post 5-11-4 is disposed on the first moving ring 5-1 and communicates with the sliding cavity 10.

[0044] When the first moving ring 5-1 slides inside the sliding cavity 10 and contacts the inner wall, the ball-end post 5-11-4 will retract into the limiting sliding cavity 5-11-1 and compress the first spring 5-11-3. The second spring 5-11-6 inside the ball-end post 5-11-4 will cause the limiting bolt 5-11-5 to enter the limiting hole 5-11-7 to restrict the movement of the first connecting rod 5-4 or the second connecting rod 5-6. Then, when the ball-end post 5-11-4 enters the receiving groove 5-11-8, the ball-end post 5-11-4 will pull the limiting bolt 5-11-5 out of the limiting hole 5-11-7 to release the restriction.

[0045] Among them, such as Figure 1-11 As shown, the first pushing device 6 includes a connecting rod 6-1, a first extrusion strip 6-2, and a second extrusion strip 6-3. The connecting rod 6-1 slides inside the mounting cylinder 1. One end of the connecting rod 6-1 is provided with the first extrusion strip 6-2, and the other end is provided with the second extrusion strip 6-3. The first extrusion strip 6-2 is extruded by the first extrusion ring 5-3, and the second extrusion strip 6-3 is extruded by the second extrusion ring 5-7. The moving connecting rod 6-1 changes the through-hole diameter of the first limiting device 7 and the second limiting device 8.

[0046] When the first extrusion bar 6-2 of the connecting rod 6-1 is extruded, it will move downward. The downward movement of the connecting rod 6-1 will cause the aperture formed by the first limiting device 7 to shrink and the aperture formed by the second limiting device 8 to expand, thus preventing the second limiting device 8 from shrinking and the first limiting device 7 from expanding.

[0047] Among them, such as Figure 1-11As shown, the first limiting device 7 includes a first inclined block 7-1, a first compression block 7-2, a first push plate 7-3, and a first return spring 7-4. The first compression block 7-2 is provided with first push plates 7-3 on both sides, and the first push plate 7-3 is provided with a first return spring 7-4. The first compression block 7-2 slides inside the mounting cylinder 1, and the connecting rod 6-1 presses the first compression block 7-2 towards the center through the first inclined block 7-1.

[0048] The first inclined block 7-1 presses the first compressed block 7-2 toward the center, thereby reducing the aperture formed by the first compressed block 7-2.

[0049] Among them, such as Figure 1-11 As shown, the second limiting device 8 includes a second inclined block 8-1, a second compression block 8-2, a second push plate 8-3, and a second return spring 8-4. The second compression block 8-2 is provided with second push plates 8-3 on both sides, and the second push plate 8-3 is provided with a second return spring 8-4. The second compression block 8-2 slides inside the mounting cylinder 1. The connecting rod 6-1 presses the second compression block 8-2 towards the center through the second inclined block 8-1. The front end of the second compression block 8-2 is provided with an inclined surface 8-5.

[0050] Similarly, the second inclined block 8-1 compresses the second compressed block 8-2, causing the aperture formed by the second compressed block 8-2 to decrease.

[0051] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. A pipe welding apparatus, comprising an installation cylinder (1), a transmission device (2), an auxiliary wheel (3), and a welding rod pushing device (5), wherein the installation cylinder (1) is provided with the transmission device (2) and the auxiliary wheel (3) in contact with the pipe, and the installation cylinder (1) is provided with a welding rod pushing device (5) for driving the welding rod to move, characterized in that, The mounting cylinder (1) is equipped with a position adjustment device (4). The transmission device (2) drives the welding rod pushing device (5) to move in the sliding cavity (10) inside the mounting cylinder (1) through the position adjustment device (4). The mounting cylinder (1) is equipped with a first pushing device (6), a first limiting device (7) and a second limiting device (8). The mounting cylinder (1) is equipped with a welding rod storage cavity (11) that communicates with the sliding cavity (10). When the first pushing device (6) is squeezed by the welding rod pushing device (5), it will change the through diameter of the first limiting device (7) and the second limiting device (8). The first limiting device (7) controls the through diameter of the sliding cavity (10), and the second limiting device (8) controls the through diameter at the connection between the sliding cavity (10) and the welding rod storage cavity (11). The welding electrode pushing device (5) includes a first moving ring (5-1), a through hole (5-2), a first pressing ring (5-3), a first connecting rod (5-4), a pushing gear (5-5), a second pressing ring (5-6), a second connecting rod (5-7), a transmission gear (5-8), a rotating screw (5-9), a threaded clamping block (5-10), and a limiting device (5-11). The first moving ring (5-1) is set on the through hole (5-2), and the pushing gear (5-5) slides inside the first moving ring (5-1). The first connecting rod (5-4) and the second connecting rod (5-7) are provided on the pushing gear (5-5), and the first pressing ring (5-3) is set on the first connecting rod (5-4). The second extrusion ring (5-6) is set on the second connecting rod (5-7), the rotating screw (5-9) is set inside the first moving ring (5-1), the rotating screw (5-9) is provided with a transmission gear (5-8) that cooperates with the push gear frame (5-5), three threaded clamping blocks (5-10) are slidably set inside the first moving ring (5-1), the threaded clamping blocks (5-10) cooperate with the rotating screw (5-9), the first moving ring (5-1) is provided with a limiting device (5-11) that limits the first connecting rod (5-4) and the second connecting rod (5-7), the first moving ring (5-1) squeezes the first pushing device (6) through the first extrusion ring (5-3) or the second extrusion ring (5-6); The first pushing device (6) includes a connecting rod (6-1), a first extrusion strip (6-2), and a second extrusion strip (6-3). The connecting rod (6-1) slides inside the mounting cylinder (1). One end of the connecting rod (6-1) is provided with the first extrusion strip (6-2), and the other end is provided with the second extrusion strip (6-3). The first extrusion strip (6-2) is extruded by the first extrusion ring (5-3), and the second extrusion strip (6-3) is extruded by the second extrusion ring (5-6). The moving connecting rod (6-1) changes the through-hole diameter of the first limiting device (7) and the second limiting device (8).

2. The pipe welding device according to claim 1, characterized in that, The electrode storage cavity (11) is provided with a guide tube (9).

3. The pipe welding apparatus according to claim 2, characterized in that, The transmission device (2) includes a mounting plate (2-1), a mounting base (2-2), a transmission wheel (2-3), a first transmission shaft (2-4), a first bevel gear (2-5), a second transmission shaft (2-6), a second bevel gear (2-7), and a first gear (2-8). The mounting plate (2-1) and the mounting base (2-2) are mounted on the mounting cylinder (1). The first transmission shaft (2-4) is mounted on the mounting base (2-2), and the second transmission shaft (2-6) is mounted on the mounting plate (2-1). The first transmission shaft (2-4) is provided with a transmission wheel (2-3) and a first bevel gear (2-5), and the second transmission shaft (2-6) is provided with a second bevel gear (2-7) and a first gear (2-8). The first bevel gear (2-5) meshes with the second bevel gear (2-7), and the first gear (2-8) drives the position adjustment device (4).

4. The pipe welding apparatus according to claim 3, characterized in that, The position adjustment device (4) includes a sliding mounting groove (4-1), a transmission gear ring (4-2), a second gear (4-3), a threaded rod (4-4), and a movable threaded block (4-5). The sliding mounting groove (4-1) is set on the mounting cylinder (1). The transmission gear ring (4-2) slides inside the sliding mounting groove (4-1). The threaded rod (4-4) is set inside the mounting cylinder (1). The threaded rod (4-4) is provided with a second gear (4-3). The second gear (4-3) is connected to the first gear (2-8) through the transmission gear ring (4-2). The welding rod pushing device (5) is set on the movable threaded block (4-5).

5. A pipe welding apparatus according to claim 4, characterized in that, The first moving ring (5-1) is provided with a guide ring (5-12) at its upper end, and the first moving ring (5-1) is disposed on the moving threaded block (4-5).

6. The pipe welding apparatus according to claim 5, characterized in that, The limiting device (5-11) includes a limiting sliding cavity (5-11-1), a second moving ring (5-11-2), a first spring (5-11-3), a ball-end post (5-11-4), a limiting bolt (5-11-5), a second spring (5-11-6), a limiting hole (5-11-7), and a receiving groove (5-11-8). The limiting sliding cavity (5-11-1) is disposed inside the first moving ring (5-1). The ball-end post (5-11-4) slides inside the limiting sliding cavity (5-11-1) via the second moving ring (5-11-2). The first spring (5-11-3)... 5-11-3) is set between the limiting sliding cavity (5-11-1) and the second moving ring (5-11-2). The limiting bolt (5-11-5) slides inside the ball end post (5-11-4). A second spring (5-11-6) is provided between the limiting bolt (5-11-5) and the ball end post (5-11-4). The first connecting rod (5-4) and the second connecting rod (5-7) are both provided with limiting holes (5-11-7). The receiving groove (5-11-8) for receiving the ball end of the ball end post (5-11-4) is set on the first moving ring (5-1) and communicates with the sliding cavity (10).

7. A pipe welding apparatus according to claim 6, characterized in that, The first limiting device (7) includes a first inclined block (7-1), a first compressed block (7-2), a first push plate (7-3), and a first return spring (7-4). The first compressed block (7-2) is provided with first push plates (7-3) on both sides, and the first push plate (7-3) is provided with a first return spring (7-4). The first compressed block (7-2) slides inside the mounting cylinder (1), and the connecting rod (6-1) squeezes the first compressed block (7-2) towards the center through the first inclined block (7-1).

8. A pipe welding apparatus according to claim 7, characterized in that, The second limiting device (8) includes a second inclined block (8-1), a second compressed block (8-2), a second push plate (8-3), and a second return spring (8-4). The second compressed block (8-2) is provided with second push plates (8-3) on both sides, and the second push plate (8-3) is provided with a second return spring (8-4). The second compressed block (8-2) slides inside the mounting cylinder (1). The connecting rod (6-1) squeezes the second compressed block (8-2) towards the center through the second inclined block (8-1). The front end of the second compressed block (8-2) is provided with an inclined surface (8-5).

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