Auxiliary welding device for building steel pipes

Abstract

The invention relates to the technical field of steel pipe welding, and discloses a building steel pipe auxiliary welding device which comprises a bottom plate, a right-angle plate is fixedly connected to the top of the rear side of the bottom plate, a first connecting plate is fixedly connected to the end, away from the bottom plate, of the right-angle plate, and a connecting column is fixedly connected to the bottom of the right-angle plate; the bottom of the connecting column is fixedly connected with a rotating mechanism, the placing mechanism comprises a first push rod fixedly connected to the top of the bottom plate, the top of the first push rod is fixedly connected with a first moving device, and the outer wall of the first moving device is movably connected with a sliding seat. When two steel pipes are welded, the welding gun is firstly driven to move by a certain distance, a part between the two pipes is welded, then the pipes are rotated, the situation that when the two steel pipes rotate, the welding effect is reduced due to inconsistent rotating speeds can be avoided, and the welding effect of equipment is improved.

Description

Technical Field

[0001] The invention relates to the technical field of steel pipe welding, in particular to an auxiliary welding device for steel pipes used in construction. Background Art

[0002] A steel pipe refers to a cylindrical hollow tube made of metal material. Generally, the length of the steel pipe is fixed when it leaves the factory. However, in actual use, the length of the steel pipe is often insufficient. In this case, a welding gun is used to weld two steel pipes together to meet the usage requirements.

[0003] The patent application with application number CN202311774316.1 discloses an auxiliary welding device for steel pipes for construction, including a base plate and a sliding member. A slide rail is installed on the top of the base plate. The sliding member is arranged on both sides of the center line of the slide rail. A clamping member, a bracket and a support member are also installed on the sliding member. An adjusting member and an auxiliary member are installed on the bottom of the support member. The auxiliary member is installed on one side of the support member. The auxiliary member includes a mounting plate, an arc plate, a lifting rod, a first spring, a limit plate and a limit member. Through the arrangement of the sliding member, the support member and the clamping member, the steel pipe can be aligned during the welding process. The clamping member can clamp and fix the steel pipe. The lifting member can lift the tail of the steel pipe to prevent the tail of the steel pipe from falling and the front end from tilting during the welding process, affecting the welding quality of the steel pipe. The arrangement of the arc plate, the lifting rod, the first spring and the limit plate can limit the rolling of the steel pipe, thereby ensuring the stability and welding quality of the steel pipe during the welding process.

[0004] When the existing equipment is in use, the welding of two steel pipes requires the welding gun to rotate around the weld seam once. If the welding gun is set to rotate, it will be difficult for the equipment to remove the welded steel pipe. If a rotating steel pipe is used for welding, the welding effect of the equipment will be poor due to the different rotation speeds of the two steel pipes in the initial stage of welding, which is not conducive to the equipment's welding of the steel pipe. Summary of the Invention

[0005] The object of the present invention is to provide an auxiliary welding device for steel pipes for construction to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: an auxiliary welding device for steel pipes for construction, comprising a base plate, a right-angle plate fixedly connected to the top of the rear side of the base plate, a connecting plate 1 fixedly connected to the end of the right-angle plate away from the base plate, a connecting column fixedly connected to the bottom of the right-angle plate, and a rotating mechanism fixedly connected to the bottom of the connecting column, and further comprising:

[0007] Placement mechanism, the placement mechanism includes a first push rod fixedly connected to the top of the bottom plate, a first moving device is fixedly connected to the top of the first push rod, the outer wall of the first moving device is movably connected to a sliding seat, a second connecting plate is fixedly connected to the top of the bottom plate, a welding mechanism is fixedly connected to the top of the second connecting plate, a placement groove is formed in the top of the sliding seat, a first roller is rotatably connected to the inner wall of the placement groove through a bearing, a second moving device is fixedly connected to the inner wall of the placement groove, and a pushing plate is movably connected to the outer wall of the second moving device. By setting the placement mechanism, the welded steel pipe in the device can be taken out of the device, without the need to draw out the welded steel pipe from one side like a circular welding device, which facilitates the blanking of the device and improves the welding efficiency of the device.

[0008] According to the above technical solution, the welding mechanism includes a first U-shaped plate, the bottom of the first U-shaped plate is fixedly connected to the second connecting plate, a through groove is formed in the outer wall of the first U-shaped plate, a first sliding groove is formed in the top of the first U-shaped plate, and an arc-shaped groove is formed at one end of the first U-shaped plate away from the second connecting plate.

[0009] According to the above technical solution, a first slider is movably connected to the inner wall of the arc-shaped groove, a welding torch is fixedly connected to the inner wall of the first slider, a connecting rod is rotatably connected to the outer wall of the first slider through a bearing, one end of the connecting rod away from the first slider is rotatably connected to a second U-shaped plate through a bearing, a second slider is fixedly connected to the outer wall of the second U-shaped plate, the outer wall of the second slider is movably connected to the through groove, a third U-shaped plate is fixedly connected to one end of the second slider away from the second U-shaped plate, a second push rod is fixedly connected to one end of the second U-shaped plate away from the connecting rod, and one end of the second push rod away from the second U-shaped plate is fixedly connected to the first U-shaped plate. By setting the welding mechanism, when welding two steel pipes, the welding torch will be driven to move a certain distance first, and a part of the two pipes will be welded. In this way, when the pipes are rotated, the situation of the welding effect decreasing due to inconsistent rotation speeds when the two steel pipes rotate can be avoided, and the welding effect of the device is improved.

[0010] According to the above technical solution, a sliding column is movably connected to the inner wall of the third U-shaped plate, connecting plates are fixedly connected to both the front and rear ends of the sliding column, a spring is sleeved on the outer wall of the sliding column, one end of the spring is fixedly connected to the third U-shaped plate, and the end of the spring away from the third U-shaped plate is fixedly connected to the connecting plate.

[0011] According to the above technical solution, the inner wall of the slide groove one is movably connected to the slider three, the outer wall of the slider three is fixedly connected to the extension plate, the bottom of the extension plate is rotatably connected to the telescopic rod through a bearing, and the outer wall of the slider three is fixedly connected to the force plate. By arranging the slider and the force plate, the mechanism will drive the movable structure of the rotating mechanism to move to both sides when the welding position is halfway moved. When the welding gun is completely deflected, the steel pipe can rotate directly, reducing the direct interval, ensuring that the welding gun does not stay at one point for too long, and ensuring the welding effect of the equipment.

[0012] According to the above technical solution, the rotating mechanism includes a pressing plate, the outer wall of the pressing plate is fixedly connected to the connecting plate 1, the top of the pressing plate is provided with a notch, the top of the pressing plate is fixedly connected to a connecting head, the inner wall of the connecting head is rotatably connected to roller 2 through a bearing, the outer wall of roller 2 is fixedly connected to gear 1, the top of the pressing plate is fixedly connected to a sliding frame, and the rear side of the pressing plate is provided with a sliding groove 2.

[0013] According to the above technical solution, the inner wall of the slide groove two is movably connected with a movable plate, the top of the movable plate is fixedly connected with a connecting frame one, the end of the connecting frame one away from the movable plate is fixedly connected to a motor, the output end of the motor is fixedly connected to a sleeve, the end of the movable plate away from the connecting frame one is fixedly connected to the connecting frame two, the end of the connecting frame two away from the movable plate is fixedly connected to a friction plate, and the end of the movable plate away from the connecting frame one is fixedly connected to an elastic component, the outer wall of the pressing plate is fixedly connected to the elastic component, and by setting a rotating mechanism, after the welding mechanism completes the deflection of the welding, it can quickly provide power for the rotation of the roller two, drive the steel pipe to rotate, and avoid the welding gun from welding at the same point for too long, resulting in bulges or through holes in the weld, thereby enhancing the welding effect of the equipment.

[0014] According to the above technical solution, the inner wall of the connecting frame 2 is rotatably connected to a cylinder through a bearing, the outer wall of the cylinder is fixedly connected to gear 2, the gear 1 is engaged with gear 2, the end of the cylinder close to the motor is fixedly connected to a friction column, the outer wall of the cylinder is provided with a groove, the outer wall of the cylinder is movably connected to the friction plate, and by setting a rotating mechanism, the roller 2 will be locked before the rotating mechanism controls the rotation of the steel pipe to avoid the rotation of the steel pipe before welding, which causes the welding gun and the steel pipe surface to move too fast, thereby resulting in poor welding effect. By controlling whether the steel pipe rotates, the welding effect of the equipment is enhanced.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The present invention improves the welding effect of the equipment by setting up a welding mechanism. When welding two steel pipes, the welding torch will be driven to move a certain distance first to weld a part between the two pipes. Then, when the pipes are rotated, the situation where the welding effect deteriorates due to inconsistent rotation speeds during the rotation of the two steel pipes can be avoided.

[0017] 2. The present invention improves the welding effect of the equipment by setting up a rotating mechanism. After the welding mechanism completes the deflection of the welding, it can quickly provide power for the rotation of the second roller, driving the steel pipe to rotate, and avoiding the appearance of protrusions or through-holes at the welding point due to the welding torch welding at the same point for too long.

[0018] 3. The present invention improves the welding effect of the equipment by setting up a rotating mechanism. Before the rotating mechanism controls the rotation of the steel pipe, the second roller will be locked to avoid the situation where the moving speed of the welding torch and the surface of the steel pipe is too fast due to the rotation of the steel pipe before welding, resulting in poor welding effect, and enhancing the welding effect by controlling whether the steel pipe rotates.

[0019] 4. The present invention improves the welding efficiency of the equipment by setting up a placing mechanism, enabling the welded steel pipe in the equipment to be taken out without the need to draw out the welded steel pipe from one side as in a ring welding equipment, which facilitates the blanking of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention. In the drawings:

[0021] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 is a schematic diagram of the placing mechanism of the present invention;

[0023] Figure 3 is a schematic diagram of the sliding seat of the present invention;

[0024] Figure 4 is a schematic diagram of the welding mechanism of the present invention;

[0025] Figure 5 is a schematic diagram of the external structure of the welding mechanism of the present invention;

[0026] Figure 6 is a schematic diagram of the internal structure of the welding mechanism of the present invention;

[0027] Figure 7 is a schematic diagram of the movable structure of the welding mechanism of the present invention;

[0028] Figure 8 is a schematic diagram of the rotating mechanism of the present invention;

[0029] Figure 9 It is a schematic diagram of the external structure of the rotating mechanism of the present invention;

[0030] Figure 10 It is a schematic diagram of the movable structure of the rotating mechanism of the present invention;

[0031] Figure 11 It is a schematic diagram of the rotating structure of the rotating mechanism of the present invention;

[0032] In the figure: 1. Base plate; 101. Right-angle plate; 102. Connecting column; 103. First connecting plate; 2. Placing mechanism; 201. First push rod; 202. First moving device; 203. Sliding seat; 204. Second connecting plate; 205. Placing groove; 206. First roller; 207. Second moving device; 208. Pushing plate; 21. Welding mechanism; 211. First U-shaped plate; 212. Through groove; 213. Arc groove; 214. First chute; 215. First slider; 216. Welding torch; 217. Connecting rod; 218. Second U-shaped plate; 219. Second slider; 2110. Third U-shaped plate; 2111. Second push rod; 2112. Sliding column; 2113. Spring; 2114. Third connecting plate; 2115. Third slider; 2116. Extension plate; 2117. Telescopic rod; 2118. Stress plate; 22. Rotating mechanism; 221. Pressing plate; 222. Notch; 223. Connecting head; 224. Second roller; 225. First gear; 226. Sliding frame; 227. Second chute; 228. Movable plate; 229. First connecting frame; 2210. Motor; 2211. Sleeve; 2212. Second connecting frame; 2213. Friction plate; 2214. Elastic component; 2215. Cylinder; 2216. Second gear; 2217. Groove; 2218. Friction column. Detailed implementation manners

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0034] Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as a limitation of the present invention.

[0035] In the present invention, unless otherwise clearly specified and defined, terms such as "installation", "connection", "linkage", "fixation", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] Embodiment 1: Refer to Figures 1-3 , the present invention provides a technical solution: an auxiliary welding device for steel pipes used in construction, including a bottom plate 1. A right-angle plate 101 is fixedly connected to the top of the rear side of the bottom plate 1. A first connecting plate 103 is fixedly connected to one end of the right-angle plate 101 away from the bottom plate 1. A connecting column 102 is fixedly connected to the bottom of the right-angle plate 101. A rotating mechanism 22 is fixedly connected to the bottom of the connecting column 102. It further includes:

[0037] A placing mechanism 2, the placing mechanism 2 includes a first push rod 201 fixedly connected to the top of the bottom plate 1. A first moving device 202 is fixedly connected to the top of the first push rod 201. A sliding seat 203 is movably connected to the outer wall of the first moving device 202. A second connecting plate 204 is fixedly connected to the top of the bottom plate 1. A welding mechanism 21 is fixedly connected to the top of the second connecting plate 204. A placing groove 205 is formed in the top of the sliding seat 203. A first roller 206 is rotatably connected to the inner wall of the placing groove 205 through a bearing. A second moving device 207 is fixedly connected to the inner wall of the placing groove 205. A pushing plate 208 is movably connected to the outer wall of the second moving device 207.

[0038] The working principle of this embodiment is as follows: When two steel pipes need to be welded, place the steel pipes in the placing groove 205. Then, the first moving device 202 drives the sliding seat 203 to move backward and lifts the steel pipes through the first push rod 201. At the same time, the second moving device 207 drives the pushing plate 208 to move, so that the welds between the two steel pipes are aligned with the welding torch 216. Then, start the welding mechanism 21 and the rotating mechanism 22 to weld the steel pipes.

[0039] Embodiment 2: On the basis of Embodiment 1, please refer to Figures 4-7The welding mechanism 21 includes a U-shaped plate 1 211. The bottom of the U-shaped plate 1 211 is fixedly connected to the connecting plate 204. A through groove 212 is provided on the outer wall of the U-shaped plate 1 211. A slide groove 1 214 is provided on the top of the U-shaped plate 1 211. An arc groove 213 is provided on the end of the U-shaped plate 1 211 away from the connecting plate 204. A slider 1 215 is movably connected to the inner wall of the arc groove 213. A welding gun 216 is fixedly connected to the inner wall of the slider 1 215. The outer wall of the slider 1 215 is rotatably connected to a connecting rod 217 through a bearing. The end of the connecting rod 217 away from the slider 1 215 is rotatably connected to the U-shaped plate 218 through a bearing. The outer wall of the U-shaped plate 218 is fixedly connected to the slider 2 219. The outer wall of the slider 219 is movably connected to the through groove 212. The end of the slider 219 away from the U-shaped plate 218 is fixedly connected to the U-shaped plate 3 2110. The end of the U-shaped plate 218 away from the connecting rod 217 is fixedly connected to the push rod 2111, and the end of the push rod 2111 away from the U-shaped plate 218 is fixedly connected to the U-shaped plate 1 211. The inner wall of the U-shaped plate 3 2110 is movably connected with a sliding column 2112. The front and rear ends of the sliding column 2112 are fixedly connected to the connecting plate 3 2114. The outer wall of the sliding column 2112 is provided with a spring 2113. One end of the spring 2113 is fixedly connected to the U-shaped plate 3 2110, and the end of the spring 2113 away from the U-shaped plate 3 2110 is fixedly connected to the connecting plate 3 2114. The inner wall of the slide groove 1 214 is movably connected with a slider 3 2115. The outer wall of the slider 3 2115 is fixedly connected to the extension plate 2116. The bottom of the extension plate 2116 is rotatably connected to the telescopic rod 2117 through a bearing. The outer wall of the slider 3 2115 is fixedly connected to the force plate 2118.

[0040] The working principle of this embodiment is as follows: after the fixation is completed, the welding gun 216 and the push rod 2111 are started. At this time, the push rod will drive the U-shaped plate 218 to move. The moving U-shaped plate 218 will drive the slider 1 215 to move along the trajectory of the arc groove 213 through the connecting rod 217, and then drive the welding gun 216 to move on the surface of the steel pipe to weld the steel pipe. At the same time, as the U-shaped plate 218 moves, the U-shaped plate 3 2110 will be driven to move through the slider 219, and then the position of the slider 3 2115 will be pulled to move through the force plate 2118. The moving slider 3 2115 will drive the movable mechanism on the rotating mechanism 22 to move to both sides through the telescopic rod 2117, so that after the welding gun 216 of the welding assembly completes the movement, it can directly drive the steel pipe to rotate and weld the subsequent positions.

[0041] Example 3: Based on Example 2, please refer to Figures 8-11, the rotating mechanism 22 includes a pressing plate 221. The outer wall of the pressing plate 221 is fixedly connected to the first connecting plate 103. A notch 222 is formed at the top of the pressing plate 221. A connecting head 223 is fixedly connected to the top of the pressing plate 221. A second roller 224 is rotatably connected to the inner wall of the connecting head 223 through a bearing. A first gear 225 is fixedly connected to the outer wall of the second roller 224. A sliding frame 226 is fixedly connected to the top of the pressing plate 221. A second chute 227 is formed at the rear side of the pressing plate 221. A movable plate 228 is movably connected to the inner wall of the second chute 227. A first connecting frame 229 is fixedly connected to the top of the movable plate 228. A motor 2210 is fixedly connected to one end of the first connecting frame 229 away from the movable plate 228. A sleeve 2211 is fixedly connected to the output end of the motor 2210. A second connecting frame 2212 is fixedly connected to one end of the movable plate 228 away from the first connecting frame 229. A friction plate 2213 is fixedly connected to one end of the second connecting frame 2212 away from the movable plate 228. An elastic component 2214 is fixedly connected to one end of the movable plate 228 away from the first connecting frame 229. The outer wall of the pressing plate 221 is fixedly connected to the elastic component 22l4. A cylinder 2215 is rotatably connected to the inner wall of the second connecting frame 2212 through a bearing. A second gear 2216 is fixedly connected to the outer wall of the cylinder 2215. The first gear 225 meshes with the second gear 2216. A friction column 2218 is fixedly connected to one end of the cylinder 2215 close to the motor 2210. A groove 2217 is formed in the outer wall of the cylinder 2215. The outer wall of the cylinder 2215 is movably connected to the friction plate 2213.

[0042] The working principle of this embodiment is as follows: As the welding torch 216 in the welding mechanism 21 completes deflection, it will push the movable plate 228 to move. The moving movable plate 228 will move the friction plate 2213 to the groove 2217 of the cylinder 2215, releasing the fixation of the cylinder 2215. At the same time, it will make the friction column 2218 embed into the sleeve 2211. As the motor 2210 starts to drive the sleeve 2211 to rotate, the rotating sleeve 2211 drives the second gear 2216 to rotate through the friction column 2218 and the cylinder 2215. The rotating second gear 2216 drives the first gear 225 to rotate, and then drives the second roller 224 to rotate, providing power for the rotation of the steel pipe. At this time, due to the rotation of the steel pipe, the welding torch 216 welds the periphery of the steel pipe.

[0043] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0044] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An auxiliary welding device for steel pipes used in construction, comprising a bottom plate (1). At the top of the rear side of the bottom plate (1), a right-angle plate (101) is fixedly connected. One end of the right-angle plate (101) away from the bottom plate (1) is fixedly connected with a first connecting plate (103). At the bottom of the right-angle plate (101), a connecting column (102) is fixedly connected. At the bottom of the connecting column (102), a rotating mechanism (22) is fixedly connected, characterized in that, It further includes: A placing mechanism (2), the placing mechanism (2) includes a first push rod (201) fixedly connected to the top of the bottom plate (1), a first moving device (202) is fixedly connected to the top of the first push rod (201), a sliding seat (203) is movably connected to the outer wall of the first moving device (202), a second connecting plate (204) is fixedly connected to the top of the bottom plate (1), a welding mechanism (21) is fixedly connected to the top of the second connecting plate (204), a placing groove (205) is formed in the top of the sliding seat (203), a first roller (206) is rotatably connected to the inner wall of the placing groove (205) through a bearing, a second moving device (207) is fixedly connected to the inner wall of the placing groove (205), and a pushing plate (208) is movably connected to the outer wall of the second moving device (207).

2. The auxiliary welding device for steel pipes used in construction according to claim 1, wherein: The welding mechanism (21) includes a first U-shaped plate (211), the bottom of the first U-shaped plate (211) is fixedly connected to the second connecting plate (204), a through groove (212) is formed in the outer wall of the first U-shaped plate (211), a first chute (214) is formed in the top of the first U-shaped plate (211), and an arc-shaped groove (213) is formed at one end of the first U-shaped plate (211) away from the second connecting plate (204).

3. An auxiliary welding device for steel pipes used in construction according to claim 2, characterized in that: A first slider (215) is movably connected to the inner wall of the arc-shaped groove (213), a welding torch (216) is fixedly connected to the inner wall of the first slider (215), a connecting rod (217) is rotatably connected to the outer wall of the first slider (215) through a bearing, one end of the connecting rod (217) away from the first slider (215) is rotatably connected to a second U-shaped plate (218) through a bearing, a second slider (219) is fixedly connected to the outer wall of the second U-shaped plate (218), the outer wall of the second slider (219) is movably connected to the through groove (212), a third U-shaped plate (2110) is fixedly connected to one end of the second slider (219) away from the second U-shaped plate (218), a second push rod (2111) is fixedly connected to one end of the second U-shaped plate (218) away from the connecting rod (217), and one end of the second push rod (2111) away from the second U-shaped plate (218) is fixedly connected to the first U-shaped plate (211).

4. The auxiliary welding device for steel pipes used in construction according to claim 3, characterized in that: A sliding column (2112) is movably connected to the inner wall of the third U-shaped plate (2110), connecting plates three (2114) are fixedly connected to both the front and rear ends of the sliding column (2112), a spring (2113) is sleeved on the outer wall of the sliding column (2112), one end of the spring (2113) is fixedly connected to the third U-shaped plate (2110), and the end of the spring (2113) away from the third U-shaped plate (2110) is fixedly connected to the connecting plate three (2114).

5. An auxiliary welding device for steel pipes used in construction according to claim 4, characterized in that: A third slider (2115) is movably connected to the inner wall of the first chute (214), an extension plate (2116) is fixedly connected to the outer wall of the third slider (2115), a telescopic rod (2117) is rotatably connected to the bottom of the extension plate (2116) through a bearing, and a force-bearing plate (2118) is fixedly connected to the outer wall of the third slider (2115).

6. The auxiliary welding device for steel pipes used in construction according to claim 5, characterized in that: The rotating mechanism (22) includes a pressing plate (221). The outer wall of the pressing plate (221) is fixedly connected to the first connecting plate (103). A notch (222) is formed at the top of the pressing plate (221). A connecting head (223) is fixedly connected to the top of the pressing plate (221). A second roller (224) is rotatably connected to the inner wall of the connecting head (223) through a bearing. A first gear (225) is fixedly connected to the outer wall of the second roller (224). A sliding frame (226) is fixedly connected to the top of the pressing plate (221). A second chute (227) is formed at the rear side of the pressing plate (221).

7. An auxiliary welding device for steel pipes used in construction according to claim 6, characterized in that: An activity plate (228) is movably connected to the inner wall of the second chute (227). A first connecting frame (229) is fixedly connected to the top of the activity plate (228). A motor (2210) is fixedly connected to one end of the first connecting frame (229) away from the activity plate (228). A sleeve (2211) is fixedly connected to the output end of the motor (2210). A second connecting frame (2212) is fixedly connected to one end of the activity plate (228) away from the first connecting frame (229). A friction plate (2213) is fixedly connected to one end of the second connecting frame (2212) away from the activity plate (228). An elastic component (2214) is fixedly connected to one end of the activity plate (228) away from the first connecting frame (229). The outer wall of the pressing plate (221) is fixedly connected to the elastic component (2214).

8. An auxiliary welding device for steel pipes used in construction according to claim 7, characterized in that: A cylinder (2215) is rotatably connected to the inner wall of the second connecting frame (2212) through a bearing. A second gear (2216) is fixedly connected to the outer wall of the cylinder (2215). The first gear (225) meshes with the second gear (2216). A friction column (2218) is fixedly connected to one end of the cylinder (2215) close to the motor (2210). A groove (2217) is formed on the outer wall of the cylinder (2215). The outer wall of the cylinder (2215) is movably connected to the friction plate (2213).

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