Pipeline welding device capable of being adjusted according to pipeline size

By using a pulley assembly driven by a hydraulic rod and a servo motor, the problem of existing devices being unable to quickly clamp different pipes has been solved, enabling fast and stable pipe welding and improving welding efficiency and quality.

CN223718536UActive Publication Date: 2025-12-26SUZHOU YUANRUI MECHANICAL & ELECTRICAL ENGINEERING CO LTD
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Patent Information

Application Number
CN202520244796.9
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-02-17
Publication Date
2025-12-26
Estimated Expiration
2035-02-17

AI Technical Summary

Technical Problem

Existing pipe welding equipment that can be adjusted according to pipe size cannot quickly complete the clamping operation when clamping different pipes.

Method used

A hydraulic rod is used to drive a moving plate and rotating components, combined with a servo motor to drive pulleys and laser welding equipment, to achieve rapid clamping and welding of different pipes.

Benefits of technology

It enables rapid and stable clamping and welding of different pipes, improving welding efficiency and quality while reducing labor costs.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the field of welding devices, and discloses a pipeline welding device capable of being adjusted according to the size of a pipeline, which comprises a bottom plate, an L-shaped supporting column is fixedly connected to the rear side of the top of the bottom plate, a hydraulic rod is fixedly connected to the bottom of the inner wall of the L-shaped supporting column, and one end of the hydraulic rod is fixedly connected with a movable plate. A rotating assembly is arranged on the outer side of the moving plate, and concave sliding grooves are formed in the left side and the right side of the L-shaped supporting column correspondingly. According to the pipeline welding device, a welded pipeline is placed above a rolling column, an electric telescopic rod is started to drive a limiting plate to move, then a T-shaped sliding block, a hollow block and the rolling column are driven to move towards the top of an L-shaped supporting column, a hydraulic rod is started to enable a movable plate to move downwards, a rotating assembly makes contact with the pipeline, and a servo motor drives a pulley to rotate; the second pulley and the rotating column are driven by the belt to rotate, the pipeline rotates along with the second pulley, and clamping and welding can be conducted according to pipelines of different sizes.
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Description

TECHNICAL FIELD

[0001] The utility model relates to welding device field especially relates to pipe welding device of adjustable according to pipe size. BACKGROUND

[0002] The pipe welding device adjustable according to pipe size is an important component of modern welding technology, aiming to improve the flexibility and adaptability of welding, which can quickly adjust according to pipes of different diameters and wall thicknesses, ensure the accuracy and efficiency of the welding process, the welding device usually includes adjustable clamp and support device, the clamp adopts multi-point fixed design, can firmly hold the pipe and keep stable, the support device can be adjusted according to the height and weight of the pipe, provide necessary support, prevent the displacement or inclination of the pipe during the welding process.

[0003] During the welding process, the device can effectively disperse the heat generated by welding, prevent welding defects caused by local overheating, at the same time, its design usually considers easy to move and install, so that it can be flexibly applied in various construction environments, the pipe welding device adjustable according to pipe size not only improves the welding quality, but also reduces the labor cost, the welder can focus more on the welding operation, instead of spending too much time on the adjustment of the device, the device is particularly important in the pipeline construction of petroleum, natural gas and chemical industry, provides strong guarantee for the safety and reliability of pipe connection.

[0004] The existing pipe welding device adjustable according to pipe size drives the rolling wheel to clamp different pipes through the hydraulic device, but in the actual use process, when facing different pipes for clamping, it cannot quickly complete the clamping of different pipes. UTILITY MODEL CONTENTS

[0005] In order to make up for the above shortcomings, the utility model provides a pipe welding device adjustable according to pipe size, aiming at improving the problem that the prior art cannot quickly complete the clamping of different pipes.

[0006] In order to achieve the above object, the utility model discloses the following technical scheme: the pipe welding device of pipeline size adjustment can be adjusted, including the bottom plate, the top rear side of bottom plate is fixedly connected with L shaped support column, the inner wall bottom of L shaped support column is fixedly connected with hydraulic pressure rod, one end of hydraulic pressure rod is fixedly connected with moving plate, the outside of moving plate is provided with rotating assembly, the left and right sides of L shaped support column are all provided with concave slide groove, the inner wall upside and downside of concave slide groove are all slidably connected with T shaped sliding block, the front side of T shaped sliding block at bottom is fixedly connected with hollow block, the inner wall front and back of hollow block are all rotatably connected with rolling column, the left and right sides of middle part of L shaped support column are all fixedly connected with electric telescopic handle, one end of electric telescopic handle is fixedly connected with limit stop, the upside and downside of limit stop are all rotatably connected with rotating strip, the outside of rotating strip is rotatably connected with corresponding T shaped sliding block respectively, the left side of L shaped support column is fixedly connected with fixed column, the bottom of fixed column is provided with telescopic mechanism, and the telescopic mechanism is used for controlling welding equipment to carry out left and right welding operation.

[0007] As further description of the above technical solution:

[0008] The telescopic mechanism includes a cylinder, the cylinder is fixedly connected to the bottom left side of the fixed column, one end of the cylinder is fixedly connected with a fixed plate, the bottom of the fixed plate is provided with a sliding block, the top of the sliding block is fixedly connected with a T-shaped strip, the T-shaped strip is slidably connected with the fixed plate, the top left side of the sliding block is fixedly connected with an inclined plate, the right side of the inclined plate is fixedly connected with a tension spring, the right side of the tension spring is fixedly connected with the fixed plate, the inner wall of the sliding block is rotatably connected with a laser welding device, the front side of the sliding block is rotatably connected with a fastening knob, the left side of the fixed plate is fixedly connected with a DC motor, the output end of the DC motor is fixedly connected with a rotating block, and the outer side of the rotating block is rotatably connected with a plurality of rotating wheels.

[0009] As further description of the above technical solution:

[0010] The rotating assembly includes a servo motor, the servo motor is fixedly connected to the top right side of the moving plate, the output end of the servo motor is fixedly connected with a pulley one, the bottom of the moving plate is rotatably connected with a rotating column, the right side of the rotating column penetrates through the bottom plate and is fixedly connected with a pulley two, and the outer sides of the pulley one and the pulley two are provided with a belt.

[0011] As further description of the above technical solution:

[0012] The outer side of the rotating column is fixedly connected with a plurality of wear-resistant rings, the outer side of the rolling column is provided with a plurality of anti-skid grooves, the top of the L shaped support column is fixedly connected with an alarm lamp, and the inner wall bottom front side of the L shaped support column is fixedly connected with a laser range finder.

[0013] As a further description of the above technical solutions:

[0014] The outer side of the fixed plate is provided with a U-shaped protective plate, a sliding groove is formed in the front side of the U-shaped protective plate, and the front side of the fixed plate is in sliding connection with the sliding groove.

[0015] As a further description of the above technical solutions:

[0016] The front side of the L-shaped supporting column is provided with a limiting groove, and the limiting groove is in sliding connection with the hollow block.

[0017] As a further description of the above technical solutions:

[0018] The bottom side of the fixed column is fixedly connected with a lamp post in the middle, and the bottom of the lamp post is fixedly connected with an illuminating lamp.

[0019] As a further description of the above technical solutions:

[0020] The right side of the direct current motor is fixedly connected with a sliding plate, the outer wall of the direct current motor penetrates the fixed plate, the inner wall of the sliding plate is provided with a trapezoidal block, the top of the trapezoidal block is provided with a rotating stud, the outer wall of the rotating stud penetrates the trapezoidal block and is in threaded connection with the sliding plate.

[0021] The utility model has the following beneficial effects:

[0022] 1、 in the utility model, the welding pipeline is placed above the rolling column, the electric telescopic rod is started to drive the limiting plate to move, and then the T-shaped sliding block, the hollow block and the rolling column are driven to move to the top of the L-shaped supporting column, after reaching the position, the hydraulic rod is started to make the moving plate move downward, the rotating assembly contacts the pipeline, when welding, the servo motor drives the pulley to rotate, the pulley two and the rotating column are driven to rotate through the belt, and the pipeline rotates accordingly, so that different sizes of the pipeline can be clamped and welded.

[0023] 2、 in the utility model, the fixed plate is driven to move to the bottom of the L-shaped supporting column by starting the air cylinder, then the direct current motor is started to drive the rotating block and the rotating wheel to rotate, under the action of the tension spring, the inclined plate is attached to the fixed plate with the sliding block, the rotating block and the rotating wheel make the inclined plate move left, so that the laser welding equipment can be driven to reciprocate at the pipeline welding position, and the firmness of the welding seam is enhanced. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is the perspective view of the pipeline welding device which can be adjusted according to the size of the pipeline provided by the utility model;

[0025] Figure 2 It is the A enlarged view of Figure 1 ​

[0026] Figure 3 The front view of the pipeline welding device capable of adjusting according to the pipeline size provided by the utility model is shown in the figure;

[0027] Figure 4 The side view of the pipeline welding device capable of adjusting according to the pipeline size provided by the utility model is shown in the figure;

[0028] Figure 5 The schematic diagram of the telescopic mechanism of the pipeline welding device capable of adjusting according to the pipeline size provided by the utility model is shown in the figure.

[0029] Legend:

[0030] 1, bottom plate; 2, telescopic mechanism; 201, air cylinder; 202, fixed plate; 203, sliding block; 204, T-shaped strip; 205, tension spring; 206, laser welding equipment; 207, fastening knob; 208, DC motor; 209, rotating block; 210, rotating wheel; 211, inclined plate; 3, L-shaped support column; 4, hydraulic rod; 5, moving plate; 6, servo motor; 7, pulley one; 8, pulley two; 9, belt; 10, rotating column; 11, hollow block; 12, rolling column; 13, T-shaped sliding block; 14, concave sliding groove; 15, electric telescopic rod; 16, limiting plate; 17, rotating strip; 18, fixed column; 19, anti-skid groove; 20, wear-resistant ring; 21, alarm lamp; 22, laser range finder; 23, U-shaped protective plate; 24, sliding groove; 25, limiting groove; 26, lamp post; 27, illuminating lamp; 28, sliding plate; 29, trapezoidal block; 30, rotating stud. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0032] Reference Figure 1 , Figure 3 and Figure 4The utility model provides a kind of welding device for pipeline according to the size adjustment of pipeline, including bottom plate 1, the top rear side of bottom plate 1 is fixedly connected with L-shaped support column 3, the inner wall bottom of L-shaped support column 3 is fixedly connected with hydraulic rod 4, one end of hydraulic rod 4 is fixedly connected with moving plate 5, the outside of moving plate 5 is provided with rotating assembly, hydraulic rod 4 drives moving plate 5 and rotating assembly further clamps pipeline;Left and right sides of L-shaped support column 3 are all provided with concave slide groove 14, the inner wall upper and lower sides of concave slide groove 14 are all slidably connected with T-shaped sliding block 13, the front side of bottom T-shaped sliding block 13 is fixedly connected with hollow block 11, the inner wall front and back sides of hollow block 11 are all rotatably connected with rolling column 12, the left and right sides of the middle part of L-shaped support column 3 are all fixedly connected with electric telescopic rod 15, one end of electric telescopic rod 15 is fixedly connected with limit plate 16, the upper and lower sides of limit plate 16 are all rotatably connected with rotating strip 17, the outside of rotating strip 17 is rotatably connected with corresponding T-shaped sliding block 13 respectively, the start of electric telescopic rod 15 will drive limit plate 16 to move, in turn drive the rotation of outside rotating strip 17, to make T-shaped sliding block 13 slide in concave slide groove 14, drive hollow block 11 and rolling column 12 to move;The left side of L-shaped support column 3 is fixedly connected with fixed column 18, the bottom of fixed column 18 is provided with telescopic mechanism 2, and telescopic mechanism 2 is used to control welding equipment to carry out left and right welding operation;

[0033] Specifically, the need to be welded is placed above the rolling column 12 above the hollow block 11, then by starting two sides electric telescopic rod 15 can drive limit plate 16 to move to two sides respectively, in turn drive the relative movement of upper and lower T-shaped sliding blocks 13, simultaneously drive hollow block 11 and rolling column 12 to move to the top of L-shaped support column 3, when moving to approximate position, by starting hydraulic rod 4 drives moving plate 5 to move to the bottom of bottom plate 1, to make that the rotating assembly above contacts with pipeline, then start rotating assembly in the process of welding, so that the servo motor 6 above drives pulley one 7 to rotate, by belt 9 drives pulley two 8 to rotate together, to drive rotating column 10 to rotate, so that the pipeline contacted with it rotates under the rotation of rotating column 10, to complete the rotation of pipeline together.

[0034] Refer to Figure 1 、 Figure 3 and Figure 5, telescopic mechanism 2 includes cylinder 201, cylinder 201 is fixedly connected at the bottom left side of fixed column 18, one end of cylinder 201 is fixedly connected with fixed plate 202, cylinder 201 drives fixed plate 202 to move;The bottom of fixed plate 202 is provided with sliding block 203, the top of sliding block 203 is fixedly connected with T-shaped strip 204, T-shaped strip 204 is slidably connected with fixed plate 202, sliding block 203 is slidably connected with fixed plate 202 through T-shaped strip 204;The top left side of sliding block 203 is fixedly connected with inclined plate 211, the right side of inclined plate 211 is fixedly connected with tension spring 205, tension spring 205 drives inclined plate 211 to be close to fixed plate 202;The right side of tension spring 205 is fixedly connected with fixed plate 202, the inner wall of sliding block 203 is rotatably connected with laser welding equipment 206, the front side of sliding block 203 is rotatably connected with fastening knob 207, the left side of fixed plate 202 is fixedly connected with DC motor 208, the output end of DC motor 208 is fixedly connected with rotating block 209, the outer side of rotating block 209 is rotatably connected with a plurality of rotating wheels 210, DC motor 208 drives rotating block 209 and the rotating wheels 210 on the outer side to rotate, so as to extrude inclined plate 211 to move to the left side, and under the reset of tension spring 205, laser welding equipment 206 reciprocates;

[0035] Specifically, by starting cylinder 201, fixed plate 202 can be driven to move to the bottom of L-shaped support column 3, when moving to the required position, then by starting DC motor 208, rotating block 209 is driven to rotate, in turn, the rotating wheels 210 on the outer side are driven to rotate, then under the action of tension spring 205, inclined plate 211 and the sliding block 203 above are fitted with fixed plate 202, and under the action of rotating block 209 and rotating wheel 210, inclined plate 211 moves a certain distance to the left side of fixed plate 202, in turn, laser welding equipment 206 reciprocates at the welding position of the two pipes, so that the weld is more reliable.

[0036] Referring to Figure 2 , Figure 3 and Figure 4The rotating assembly comprises a servo motor 6 fixedly connected to the top right side of the moving plate 5, a pulley one 7 fixedly connected to the output end of the servo motor 6, a rotating column 10 rotatably connected to the bottom of the moving plate 5, a pulley two 8 fixedly connected to the right side of the rotating column 10 and penetrating through the bottom plate 1, a belt 9 provided on the outer sides of the pulley one 7 and the pulley two 8, and the servo motor 6 can drive the pulley one 7 to rotate, and the pulley two 8 is further driven to rotate through the transmission of the belt 9, so as to drive the rotating column 10 to rotate; a plurality of wear-resistant rings 20 are fixedly connected to the outer side of the rotating column 10, a plurality of anti-skid grooves 19 are formed in the outer side of the rolling column 12, the wear-resistant rings 20 can improve the wear resistance of the rotating column 10, and the anti-skid grooves 19 can improve the anti-skid performance of the rolling column 12; the top of the L-shaped support column 3 is fixedly connected with an alarm lamp 21, and the inner wall of the L-shaped support column 3 is fixedly connected with a laser range finder 22 at the bottom of the front side; the alarm lamp 21 can remind the workers when a fault occurs, and the laser range finder 22 can facilitate the measurement of the distance between the device and the pipeline.

[0037] Specifically, the servo motor 6 can drive the pulley one 7 to rotate, and the pulley two 8 is further driven to rotate through the transmission of the belt 9, so as to drive the rotating column 10 to rotate, the wear-resistant rings 20 can improve the wear resistance of the rotating column 10, the anti-skid grooves 19 can improve the anti-skid performance of the rolling column 12, the alarm lamp 21 can remind the workers when a fault occurs, and the laser range finder 22 can facilitate the measurement of the distance between the device and the pipeline.

[0038] Referring to Figure 1 , Figure 3 and Figure 5 , the outer side of the fixed plate 202 is provided with a U-shaped protective plate 23, the front side of the U-shaped protective plate 23 is provided with a sliding groove 24, the front side of the fixed plate 202 is slidably connected with the sliding groove 24, and the U-shaped protective plate 23 can prevent the strong light generated during welding from stimulating the workers' eyes; the front side of the L-shaped support column 3 is provided with a limiting groove 25, the limiting groove 25 is slidably connected with the hollow block 11, the limiting groove 25 can limit the moving direction of the hollow block 11 and facilitate the movement thereof; the bottom side of the fixed column 18 is fixedly connected with a lamp post 26, the bottom of the lamp post 26 is fixedly connected with an illuminating lamp 27, and the illuminating lamp 27 can provide additional illumination for the device; the right side of the direct current motor 208 is fixedly connected with a sliding plate 28, the outer wall of the direct current motor 208 penetrates through the fixed plate 202, the inner wall of the sliding plate 28 is provided with a trapezoidal block 29, the top of the trapezoidal block 29 is provided with a rotating stud 30, the outer wall of the rotating stud 30 penetrates through the trapezoidal block 29 and is threadedly connected with the sliding plate 28, the sliding plate 28 can adjust the position of the direct current motor 208 above the fixed plate 202, and the position of the sliding plate 28 is fixed by rotating the rotating stud 30 to press the trapezoidal block 29;

[0039] Specifically, the U-shaped protective plate 23 can prevent the strong light generated during welding from stimulating the eyes of the workers, the limiting groove 25 can limit the moving direction of the hollow block 11 and facilitate the movement thereof, the illuminating lamp 27 can provide additional illumination for the device, the sliding plate 28 can adjust the position of the DC motor 208 above the fixed plate 202, and the rotating stud 30 is rotated to press the trapezoidal block 29, thereby fixing the position of the sliding plate 28.

[0040] Working principle: before using the device, first, place the pipeline to be welded on the rolling column 12 above the hollow block 11, then start the electric telescopic rod 15 on both sides to move the limiting plate 16 to both sides, thereby promoting the relative displacement of the T-shaped sliding block 13 on both sides, at the same time, the hollow block 11 and the rolling column 12 will move together to the top end of the L-shaped support column 3, when the components reach the required position, the moving plate 5 is moved to the bottom of the bottom plate 1 by starting the hydraulic rod 4, so that the rotating assembly above contacts the pipeline, during the welding process, the rotating assembly is started, the pulley one 7 is driven to rotate by the servo motor 6 above, the pulley two 8 is driven to rotate synchronously by the belt 9, thereby the rotating column 10 is rotated, and the pipeline in contact with the rotating column 10 is rotated synchronously under the action of the rotating column 10, thereby the common rotation of the pipeline is completed.

[0041] And through the telescopic mechanism 2, by starting the cylinder 201, the fixed plate 202 can be moved to the bottom of the L-shaped support column 3, when reaching the predetermined position, the DC motor 208 is started to rotate the rotating block 209, thereby driving the rotating wheel 210 on the outside to rotate synchronously, under the action of the tension spring 205, the inclined plate 211 and the sliding block 203 above are closely attached to the fixed plate 202, but under the joint action of the rotating block 209 and the rotating wheel 210, the inclined plate 211 moves a certain distance to the left side of the fixed plate 202, and is reset under the action of the tension spring 205, thereby pushing the laser welding equipment 206 to reciprocate at the welding position of the two pipelines, to enhance the firmness of the weld.

[0042] Finally, it should be noted that the above description is only a preferred embodiment of the present application and is not intended to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A welding device for pipes, adjustable according to the size of the pipe, comprising a base plate (1), characterized in that: The top rear side of the bottom plate (1) is fixedly connected with an L-shaped support column (3), the inner wall bottom of the L-shaped support column (3) is fixedly connected with a hydraulic rod (4), one end of the hydraulic rod (4) is fixedly connected with a moving plate (5), the outer side of the moving plate (5) is provided with a rotating assembly, the left and right sides of the L-shaped support column (3) are both provided with a concave sliding groove (14), the inner wall of the concave sliding groove (14) is slidably connected with a T-shaped sliding block (13) on the upper and lower sides, the front side of the T-shaped sliding block (13) at the bottom is fixedly connected with a hollow block (11), the inner wall of the hollow block (11) is rotatably connected with a rolling column (12) on the front and rear sides, the middle left and right sides of the L-shaped support column (3) are both fixedly connected with an electric telescopic rod (15), one end of the electric telescopic rod (15) is fixedly connected with a limiting plate (16), the upper and lower sides of the limiting plate (16) are rotatably connected with a rotating strip (17), the outer side of the rotating strip (17) is rotatably connected with the corresponding T-shaped sliding block (13), the left side of the L-shaped support column (3) is fixedly connected with a fixed column (18), the bottom of the fixed column (18) is provided with a telescopic mechanism (2), and the telescopic mechanism (2) is used for controlling the welding equipment to perform left and right welding operations.

2. The pipe welding device according to claim 1, wherein: The telescopic mechanism (2) comprises a pneumatic cylinder (201), the pneumatic cylinder (201) is fixedly connected to the bottom left side of the fixed column (18), one end of the pneumatic cylinder (201) is fixedly connected with a fixed plate (202), the bottom of the fixed plate (202) is provided with a sliding block (203), the top of the sliding block (203) is fixedly connected with a T-shaped strip (204), the T-shaped strip (204) is slidably connected with the fixed plate (202), the top left side of the sliding block (203) is fixedly connected with an inclined plate (211), the right side of the inclined plate (211) is fixedly connected with a tension spring (205), the right side of the tension spring (205) is fixedly connected with the fixed plate (202), the inner wall of the sliding block (203) is rotatably connected with a laser welding equipment (206), the front side of the sliding block (203) is rotatably connected with a fastening knob (207), the left side of the fixed plate (202) is fixedly connected with a DC motor (208), the output end of the DC motor (208) is fixedly connected with a rotating block (209), and the outer side of the rotating block (209) is rotatably connected with a plurality of rotating wheels (210).

3. The pipe welding device according to claim 1, wherein: The rotating assembly comprises a servo motor (6), the servo motor (6) is fixedly connected to the top right side of the moving plate (5), the output end of the servo motor (6) is fixedly connected with a pulley one (7), the bottom of the moving plate (5) is rotatably connected with a rotating column (10), the right side of the rotating column (10) penetrates through the bottom plate (1) and is fixedly connected with a pulley two (8), and the outer sides of the pulley one (7) and the pulley two (8) are provided with a belt (9).

4. The pipe welding device according to claim 3, wherein: The outer side of the rotating column (10) is fixedly connected with a plurality of wear-resistant rings (20), the outer side of the rolling column (12) is provided with a plurality of anti-skid grooves (19), the top of the L-shaped support column (3) is fixedly connected with an alarm lamp (21), and the inner wall bottom front side of the L-shaped support column (3) is fixedly connected with a laser range finder (22).

5. The pipe welding device according to claim 2, wherein: The outer side of the fixed plate (202) is provided with a U-shaped protective plate (23), the front side of the U-shaped protective plate (23) is provided with a sliding groove (24), and the front side of the fixed plate (202) is in sliding connection with the sliding groove (24).

6. The pipe welding device adjustable according to pipe size according to claim 1, wherein: The front side of the L-shaped support column (3) is provided with a limiting groove (25), and the limiting groove (25) is in sliding connection with the hollow block (11).

7. The pipe welding device adjustable according to pipe size according to claim 1, wherein: The bottom side of the fixed column (18) is fixedly connected with a lamp post (26), and the bottom of the lamp post (26) is fixedly connected with an illuminating lamp (27).

8. The pipe welding device adjustable according to pipe size according to claim 2, wherein: The right side of the direct current motor (208) is fixedly connected with a sliding plate (28), the outer wall of the direct current motor (208) penetrates the fixed plate (202), the inner wall of the sliding plate (28) is provided with a trapezoidal block (29), the top of the trapezoidal block (29) is provided with a rotating stud (30), the outer wall of the rotating stud (30) penetrates the trapezoidal block (29) and is in threaded connection with the sliding plate (28).