Welding machine for steel shed installation

By designing a welding machine for steel shed installation, and utilizing electromagnetic adsorption and mechanical assistance to adjust the position and angle of the welding gun, the problem of limited space for the robotic arm in the welding of large steel sheds was solved, achieving efficient and low-consumption welding operations.

CN121776757APending Publication Date: 2026-04-03TANGSHAN CAOFEIDIAN ORE STORAGE & TRANSPORTATION CO LTD
View PDF 0 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-09
Publication Date
2026-04-03

AI Technical Summary

Technical Problem

When welding large steel sheds with existing equipment, the robotic arm has limited space to move, making it difficult to make large-scale, wide-span position adjustments. This results in construction workers having to frequently adjust the welding position and angle, which is physically demanding and difficult to operate.

Method used

Design a welding machine for steel shed installation. It adopts components such as an arc frame, main support column, electromagnet, telescopic support column and welding gun body. The position and angle of the welding gun are adjusted by electromagnetic adsorption and mechanical assistance to achieve semi-automatic welding.

Benefits of technology

It reduces the physical exertion of construction workers, decreases operational errors, improves welding efficiency and precision, and simplifies high-altitude welding operations.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN121776757A_ABST
    Figure CN121776757A_ABST
Patent Text Reader

Abstract

The invention relates to the field of welding equipment, in particular to a welding machine for steel shed installation. According to the welding machine for steel shed installation, the arc-shaped frame is firmly fixed to the steel shed main beam through the electromagnets on the main supporting columns, and the transverse welding position and the welding height of the welding gun body are automatically adjusted through the transverse sliding block and the height adjusting sliding block correspondingly; at the moment, a constructor only needs to control the arc-shaped sliding block with one hand to drive the welding gun body to rotate by a small angle, the welding angle of the welding gun body is adjusted, the welding work between the steel shed main beam and the steel shed support is semi-automatically completed, a safety binding belt is further arranged on the arc-shaped frame, and the arc-shaped frame can be firmly bound to the steel shed main beam through the safety binding belt. The high-altitude falling phenomenon of the arc-shaped frame is avoided. The technical problems that a constructor needs to lift an arm for a long time to control a welding gun with a single hand, and continuous high-fineness welding treatment work is conducted on a steel shed main beam and a steel shed support, so that physical output is large, and operation difficulty is high are solved.
Need to check novelty before this filing date? Find Prior Art

Description

Technical Field

[0001] This invention relates to the field of welding equipment, and more particularly to a welding machine for steel shed installation. Background Technology

[0002] The main beams of large steel sheds are often made of single large-diameter steel pipes, sometimes tens of meters long. Their overall length and weight exceed transportation and hoisting limits, necessitating on-site segmented assembly and welding to ensure dimensional accuracy and structural rigidity. On-site welding also allows for real-time control of deformation caused by heat input, adjusting bevels, welding sequence, and parameters in conjunction with the actual positions of supports and embedded parts, facilitating on-site quality inspection and handover. While existing equipment, controlled by robotic arms, can automate the welding of the main beams and supports of steel sheds, the welding of such large steel sheds presents challenges. Due to the limited working space of the robotic arm, it is difficult to perform large-scale, wide-span position adjustments. Therefore, it is impossible to use the robotic arm for automated welding of large steel sheds. When welding large steel sheds manually, it is necessary to frequently adjust the welding position and angle of the welding gun. When the main beam of the steel shed is located in a high-altitude area, it is also necessary to manually hold the lifting equipment for high-altitude welding operations. At this time, the construction workers need to raise their arms for a long time and operate the welding gun with one hand to perform continuous and high-precision welding of the main beam of the steel shed and the steel shed support. The entire welding work requires a lot of physical strength and the overall operation is quite difficult. Summary of the Invention

[0003] To overcome the drawbacks of high physical exertion and operational difficulty in the continuous, high-precision welding of the main beam and support of the steel shed, which requires construction workers to hold up their arms for extended periods and operate the welding gun with one hand, this invention provides a welding machine for steel shed installation.

[0004] Technical Solution: A welding machine for steel shed installation includes an arc-shaped frame, a main support column, an electromagnet, a telescopic support column, a compression spring, an arc-shaped slider, a transverse slider, a transverse electric push rod, a height adjustment slider, a sleeve, a torsion spring, a motor, a gear, an arc-shaped rack, and a welding gun body; a control console is mounted on the arc-shaped frame; the main support column is connected to the middle of the arc-shaped frame; an electromagnet is mounted at the bottom of the main support column; two telescopic support columns are slidably connected to the arc-shaped frame; a compression spring is fixed between the telescopic support column and the arc-shaped frame; an arc-shaped slider is slidably connected to the arc-shaped frame; the front and rear sides of the arc-shaped slider slide... A horizontal slider is connected; a height adjustment slider is slidably connected to the horizontal slider; a horizontal electric push rod is installed on each of the front and rear sides of the arc frame; the telescopic end of the horizontal electric push rod is fixed to the horizontal slider on the same side; a sleeve is rotatably connected to the height adjustment slider; a welding gun body is inserted into one of the sleeves; a torsion spring is fixed between the sleeve and the corresponding height adjustment slider; a motor is installed on the height adjustment slider; a missing gear is fixed to the output shaft of the motor; an arc-shaped rack is fixed to the sleeve, and the rotation axis of the arc-shaped rack is aligned with the rotation axis of the sleeve; the arc-shaped rack meshes with the corresponding missing gear.

[0005] More preferably, the main support column is fixed with a magnetic shielding ring.

[0006] More preferably, both sleeves are made of elastic material, and the elastic material has a U-shaped jacket structure.

[0007] More preferably, an electric height adjustment push rod is installed on the horizontal slider; the telescopic end of the electric height adjustment push rod is fixedly connected to the corresponding height adjustment slider; a gas supply pipe is fixedly connected to the welding gun body, and the gas supply pipe is connected to the protective gas supply pipe built into the welding gun body; a jet nozzle structure is opened on the gas supply pipe; a high-temperature resistant rangefinder is installed on the gas supply pipe.

[0008] More preferably, a flame deflector for protecting the high-temperature rangefinder is fixed to the welding gun body.

[0009] More preferably, a handle is fixed to both the front and rear sides of the curved frame.

[0010] More preferably, the main support column is slidably connected to the arc-shaped frame; an adjusting screw is rotatably connected to the arc-shaped frame; the threaded structure of the adjusting screw is screwed to the main support column.

[0011] More preferably, the telescopic support column is rotatably connected to casters for lateral movement along the surface of the main steel beam.

[0012] More preferably, a safety strap is fixed to one side of the bottom of the curved frame; a restraining buckle is fixed to the other side of the bottom of the curved frame; and the safety strap is wrapped around the restraining buckle.

[0013] More preferably, the safety strap has several anti-slip pads fixed to it.

[0014] Compared with the prior art, the present invention has the following advantages: The present invention provides a welding machine for steel shed installation. The arc-shaped frame is firmly fixed to the main beam of the steel shed by an electromagnet on the main support column in conjunction with the compression springs on both sides and the telescopic support column. The height adjustment screw can be adjusted to accommodate the size and structure of the main beam of the steel shed with various diameters. The horizontal welding position and welding height of the welding gun body are automatically adjusted by the horizontal slider and the height adjustment slider, respectively. At this time, the construction personnel only need to control the arc-shaped slider with one hand to drive the welding gun body to rotate at a small angle and adjust the welding angle of the welding gun body. The welding work between the main beam of the steel shed and the steel shed support is completed semi-automatically. The arc-shaped frame is also equipped with a safety strap, which can also firmly bind the arc-shaped frame to the main beam of the steel shed, preventing the arc-shaped frame from falling from a height.

[0015] This invention discloses a welding machine for steel shed installation, which not only significantly reduces the energy consumption of construction workers in welding work, but also reduces operational errors in welding work by adding semi-automatic mechanical assistance. It overcomes the technical problems of high physical exertion and high operational difficulty in the continuous high-precision welding of the main beam and support of the steel shed, which requires construction workers to raise their arms for a long time to operate the welding gun with one hand. Attached Figure Description

[0016] Figure 1 A three-dimensional schematic diagram illustrating the present invention;

[0017] Figure 2 A three-dimensional schematic diagram illustrating the arc-shaped frame of the present invention;

[0018] Figure 3 A three-dimensional schematic diagram illustrating the main support column of the present invention;

[0019] Figure 4 A three-dimensional schematic diagram illustrating the horizontal slider of the present invention;

[0020] Figure 5 A three-dimensional schematic diagram illustrating the height adjustment slider of the present invention;

[0021] Figure 6 This is a three-dimensional schematic diagram illustrating the missing gear and arc-shaped rack of the present invention;

[0022] Figure 7 A three-dimensional schematic diagram illustrating the gas pipeline of the present invention;

[0023] Figure 8 This is a schematic diagram illustrating the fixed state of the present invention on the main beam of a steel shed.

[0024] The components in the attached diagram are labeled as follows: 1-Arc-shaped frame, 10-Control console, 11-Main support column, 12-Electromagnet, 13-Height adjustment screw, 14-Magnetic shielding ring, 15-Telescopic support column, 16-Compression spring, 17-Cast wheel, 18-Safety strap, 181-Anti-slip pad, 19-Securing buckle, 2-Arc-shaped slider, 21-Horizontal slider, 22-Horizontal electric push rod, 23-Height adjustment slider, 24-Height adjustment electric push rod, 25-Tube sleeve, 26-Torsion spring, 27-Motor, 28-Missing gear, 29-Arc-shaped rack, 3-Welded gun body, 31-Air supply pipe, 3101-Jet nozzle structure, 32-High temperature rangefinder, 33-Flame deflector, 4-Handle, 51-Steel canopy main beam, 52-Steel canopy support. Detailed Implementation

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. 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.

[0026] Example 1: A welding machine for steel shed installation, such as... Figures 1-7As shown, the assembly includes an arc-shaped frame 1, a main support column 11, an electromagnet 12, a magnetic shielding ring 14, a telescopic support column 15, a compression spring 16, an arc-shaped slider 2, a horizontal slider 21, a horizontal electric push rod 22, a height adjustment slider 23, a sleeve 25, a torsion spring 26, a motor 27, a missing gear 28, an arc-shaped rack 29, a welding gun body 3, and a handle 4. A control console 10 is mounted on the arc-shaped frame 1. The main support column 11 is connected to the middle of the arc-shaped frame 1. An electromagnet 12 is mounted at the bottom of the main support column 11, and the electromagnet 12 is externally connected to a moving power supply. A magnetic shielding ring 14 is fixedly attached to the outer edge of the bottom of the main support column 11. A telescopic support column 15 is slidably connected to each of the front and rear sides of the arc-shaped frame 1. A compression spring 16 is fixedly connected between each of the two telescopic support columns 15 and the arc-shaped frame 1. An arc-shaped slider 2 is slidably connected to the arc-shaped frame 1. A horizontal slider 21 that moves in the left-right direction is slidably connected to each of the front and rear sides of the arc-shaped slider 2. Each of the two horizontal sliders 21 has a sliding... The system includes a height adjustment slider 23; two transverse electric push rods 22 are installed on the front and rear sides of the arc frame 1; the telescopic end of each transverse electric push rod 22 is fixedly connected to the transverse slider 21 on the same side; a sleeve 25 is rotatably connected to each of the two height adjustment sliders 23, and the sleeve 25 is made of elastic material with a U-shaped jacket structure; a welding gun body 3 is inserted into one of the sleeves 25, and the welding gun body 3 is externally connected to the welding control host; a torsion spring 26 is fixedly connected between each of the two sleeves 25 and the corresponding height adjustment slider 23; a motor 27 is installed on each of the two height adjustment sliders 23; a missing gear 28 is fixedly connected to the output shaft of each of the two motors 27; an arc-shaped rack 29 is fixedly connected to each of the two sleeves 25, and the rotation axis of the arc-shaped rack 29 is aligned with the rotation axis of the sleeve 25; the two arc-shaped racks 29 mesh with a corresponding missing gear 28; a handle 4 is fixedly connected to the front and rear sides of the arc frame 1.

[0027] Each of the two horizontal sliders 21 is equipped with a height adjustment electric push rod 24; the telescopic ends of the two height adjustment electric push rods 24 are respectively fixed to the corresponding height adjustment sliders 23; a gas supply pipe 31 is fixedly connected to the welding gun body 3, and the gas supply pipe 31 is connected to the protective gas supply pipe built into the welding gun body 3; a jet nozzle structure 3101 is opened on the side of the gas supply pipe 3 facing the welding gun head of the welding gun body 3; a high-temperature resistant rangefinder 32 is installed on the gas supply pipe 31; a flame deflector 33 is fixedly connected to the welding gun body 3, and the flame deflector 33 is located between the welding gun head of the welding gun body 3 and the high-temperature resistant rangefinder 32; when the welding gun body 3 is performing welding work, it needs to supply protective gas to the gun head of the welding gun body 3 through the protective gas supply pipe, and at the same time, part of the protective gas in the protective gas supply pipe is sprayed out below the high-temperature resistant rangefinder 32 through the jet nozzle structure 3101 of the gas supply pipe 31 to avoid the welding fumes from blocking the high-temperature resistant rangefinder 32, and at the same time, the flame deflector 33 blocks the flame generated by welding.

[0028] Staff only need to remotely control the console 10 to automatically control the electromagnet 12, the horizontal electric push rod 22, the height adjustment electric push rod 24, and the motor 27 according to the set program.

[0029] The following are the steps for fixing a welding machine for installing a steel shed on the main beam 51 of the steel shed in this embodiment.

[0030] First, the construction workers aligned the main support column 11 of the arc-shaped frame 1 above the main beam 51 of the steel shed, and then placed the telescopic support columns 15 on the front and rear sides of the steel shed support 52, respectively. Figure 8 As shown, the steel shed support 52 to be welded is located between the front and rear sleeves 25. In the initial state, the welding gun 3 is located on the front sleeve 25, and the tip of the welding gun 3 is aligned with the left side of the welding area between the steel shed support 52 and the main steel beam 51. Then, the construction worker presses the arc frame 1 down forcefully. The arc frame 1 drives the telescopic support column 15 to retract, and at the same time, the telescopic support column 15 drives the compression spring 16 to compress until the electromagnet 12 and the magnetic shielding ring 14 on the main support column 11 are pressed tightly against the main steel beam 51. Then, the electromagnet 12 is activated through the control console 10. The electromagnet 12 generates a strong electromagnetic attraction to the main steel beam 51. Through this strong electromagnetic attraction, the electromagnet 12 firmly magnetically attracts the arc frame 1 to the main steel beam 51. At this time, the compression spring 16 remains in a compressed state, and the compressed spring 16, through the generated reverse elastic force, firmly presses the telescopic support column 15 onto the main steel beam 51. This achieves the goal of fixing the arc frame 1 firmly onto the main steel beam 51 through the electromagnet 12 on the main support column 11, in conjunction with the compression springs 16 on both sides and the telescopic support column 15. Furthermore, the center of the arc frame 1 and the arc slider 2 coincides with the axis of the main steel beam 51.

[0031] The welding steps for the main beam 51 and the support frame 52 of the steel shed using a welding machine for steel shed installation in this embodiment are as follows.

[0032] After completing the above-mentioned fixing work on the main beam 51 of the steel shed, the motor 27 controlled by the control console 10 drives the missing gear 28 to rotate. When the tooth profile of the missing gear 28 meshes with the arc-shaped rack 29, the missing gear 28 drives the arc-shaped rack 29 and the welding gun body 3 on the sleeve 25 to rotate in a positive small angle. At the same time, the sleeve 25 drives the torsion spring 26 to twist. When the tooth profile of the missing gear 28 disengages from the arc-shaped rack 29, the torsion spring 26 drives the welding gun body 3 on the sleeve 25 to rotate in the opposite small angle to reset, realizing the welding gun head of the welding gun body 3 at a small angle. The welding torch oscillates back and forth across the welding area between the steel canopy support 52 and the main steel beam 51. Simultaneously, the external welding control unit performs welding work on the welding area between the steel canopy support 52 and the main steel beam 51 via the welding torch body 3. At the same time, the control console 10 controls the transverse electric push rod 22 to automatically pull the transverse slider 21, causing the welding torch body 3 on the sleeve 25 to move to the right along the front welding area between the steel canopy support 52 and the main steel beam 51. Simultaneously, the high-temperature rangefinder 32 continuously monitors the height distance between the torch head of the welding torch body 3 and the main steel beam 51, and transmits this information via the control console 10. The height adjustment electric push rod 24 automatically drives the height adjustment slider 23 to move vertically. The height adjustment slider 23 drives the pipe sleeve 25 and the welding gun body 3 to move vertically in sync, adjusting the height distance between the welding gun head 3 and the main steel beam 51, keeping the height distance between them within a specified range. Simultaneously, the construction personnel observe whether the welding gun head 3 is aligned with the front welding area of ​​the steel frame support 52 and the main steel beam 51 as it moves to the right, and manually pull the handle 4 to move the arc-shaped slider 2 along the arc-shaped frame 1. Since the center of the arc frame 1 and the arc slider 2 coincides with the axis of the main steel beam 51, the construction personnel can control the arc slider 2 to move along the arc frame 1, thereby driving the welding gun head of the welding gun body 3 to rotate around the axis of the main steel beam 51. This allows for adjustment of the welding angle of the welding gun head, ensuring that the welding gun head remains aligned with the front welding area of ​​the steel bracket 52 and the main steel beam 51 as the welding gun body 3 moves to the right. This enables semi-automatic completion of the welding work on the front welding area of ​​the steel bracket 52 and the main steel beam 51.

[0033] After completing the semi-automatic welding of the front welding area between the steel shed support 52 and the main steel beam 51, the transverse electric push rod 22 automatically pushes the transverse slider 21 to move the welding gun body 3 on the sleeve 25 to the left and reset. The construction personnel then remove the welding gun body 3 from the front sleeve 25 and insert it into the rear sleeve 25. Following the above steps, the welding work of the front welding area between the steel shed support 52 and the main steel beam 51 is completed semi-automatically by the welding gun body 3. The construction personnel do not need to raise their arms to operate the welding gun with one hand to perform continuous high-precision welding work between the main steel beam 51 and the steel shed support 52. They only need to operate the arc slider 2 to adjust the welding angle of the welding gun body 3. This not only greatly reduces the energy consumption of the construction personnel in the welding work, but also reduces the occurrence of operational errors in the welding work due to the addition of semi-automatic mechanical assistance.

[0034] Example 2, as Figures 1-7 As shown, based on the above embodiment 1, the main support column 11 of this embodiment is slidably connected to the arc-shaped frame 1; the arc-shaped frame 1 is rotatably connected to the height adjustment screw 13; the threaded structure of the height adjustment screw 13 is screwed to the main support column 11; during the process of fixing the arc-shaped frame 1 to the main steel shed beam 51, the construction personnel rotate the height adjustment screw 13 to drive the main support column 11 to extend and retract according to the different radii of the main steel shed beam 51, so as to adjust the distance between the arc-shaped frame 1 and the main steel shed beam 51 until the center of the arc-shaped frame 1 and the arc-shaped slider 2 coincides with the axis of the main steel shed beam 51, ensuring that the arc-shaped slider 2 can rotate around the axis of the main steel shed beam 51 during the movement along the arc-shaped frame 1. The central axis rotates to accommodate various diameters of the main steel beam 51. Two casters 17 are rotatably connected to each of the two telescopic support columns 15. When the construction worker places the arc-shaped frame 1 on the main steel beam 51 but before fixing it, the casters 17 are close to the outer surface of the main steel beam 51. Since the casters 17 on the front and rear sides are not parallel on the same horizontal plane, they are positioned at staggered angles on the main steel beam 51. At this time, the construction worker can push the arc-shaped frame 1 to move the casters 17 laterally close to the outer surface of the main steel beam 51, easily adjusting the lateral position of the arc-shaped frame 1 on the main steel beam 51.

[0035] Example 3, as Figures 1-7As shown, based on the above embodiment 2, a safety strap 18 is fixedly connected to one side of the bottom of the arc-shaped frame 1 in this embodiment; a locking buckle 19 is fixedly connected to the other side of the bottom of the arc-shaped frame 1; the safety strap 18 is wrapped around the locking buckle 19, and the locking buckle 19 is initially in an unlocked state; when welding work needs to be carried out on the steel canopy main beam 51 several meters away from the ground, during the process of fixing the arc-shaped frame 1 to the steel canopy main beam 51, the construction workers first remove the safety strap 18 from the locking buckle 19, and after the arc-shaped frame 1 is magnetically fixed to the steel canopy main beam 51 by the main support column 11 and the electromagnet 12, the construction workers wrap the safety strap 18 around the side of the steel canopy main beam 51 away from the arc-shaped frame 1 and then wrap it back to the locking buckle 19. The construction workers then pull the safety strap 18 tightly onto the locking buckle 19, ensuring the safety strap 18 is firmly attached to the main steel beam 51. Afterwards, pressing the locking buckle 19 securely locks the safety strap 18 in place, achieving a circular fixation between the arc-shaped frame 1 and the safety strap 18 on the main steel beam 51. If the arc-shaped frame 1 accidentally slips off the main steel beam 51, the safety strap 18 will firmly bind it to the main steel beam 51, preventing a fall from a height. Several anti-slip pads 181 are fixed to the safety strap 18, ensuring it adheres firmly to the main steel beam 51 and enhancing its anti-slip fixation.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A welding machine for steel shed installation, comprising an arc-shaped frame (1); a control console (10) mounted on the arc-shaped frame (1); characterized in that, It also includes a main support column (11); the main support column (11) is connected to the middle of the arc frame (1); an electromagnet (12) is installed at the bottom of the main support column (11); two telescopic support columns (15) are slidably connected to the arc frame (1); a compression spring (16) is fixed between the telescopic support column (15) and the arc frame (1); an arc slider (2) is slidably connected to the arc frame (1); a transverse slider (21) is slidably connected to the front and rear sides of the arc slider (2); a height adjustment slider (23) is slidably connected to the transverse slider (21); a transverse electric push rod (22) is installed on the front and rear sides of the arc frame (1); the transverse electric... The telescopic end of the push rod (22) is fixed to the transverse slider (21) on the same side; a sleeve (25) is rotatably connected to the height adjustment slider (23); a welding gun body (3) is inserted into one of the sleeves (25); a torsion spring (26) is fixed between the sleeve (25) and the corresponding height adjustment slider (23); a motor (27) is installed on the height adjustment slider (23); a missing gear (28) is fixed to the output shaft of the motor (27); an arc rack (29) is fixed to the sleeve (25), and the rotation axis of the arc rack (29) is aligned with the rotation axis of the sleeve (25); the arc rack (29) meshes with the corresponding missing gear (28).

2. The welding machine for steel shed installation according to claim 1, characterized in that, The main support column (11) is fixed with a magnetic shielding ring (14).

3. The welding machine for steel shed installation according to claim 1, characterized in that, Both sleeves (25) are made of elastic material, and the elastic material has a U-shaped jacket structure.

4. The welding machine for steel shed installation according to claim 1, characterized in that, A height adjustment electric push rod (24) is installed on the horizontal slider (21); the telescopic end of the height adjustment electric push rod (24) is fixedly connected to the corresponding height adjustment slider (23); a gas supply pipe (31) is fixedly connected to the welding gun body (3), and the gas supply pipe (31) is connected to the protective gas supply pipe built into the welding gun body (3); a jet nozzle structure (3101) is opened on the gas supply pipe (31); a high temperature rangefinder (32) is installed on the gas supply pipe (31).

5. A welding machine for steel shed installation according to claim 4, characterized in that, A flame deflector (33) for protecting the high-temperature rangefinder (32) is fixedly attached to the welding gun body (3).

6. The welding machine for steel shed installation according to claim 1, characterized in that, A handle (4) is fixed to the front and rear sides of the arc frame (1).

7. A welding machine for steel shed installation according to any one of claims 1-6, characterized in that, The main support column (11) is slidably connected to the arc frame (1); the arc frame (1) is rotatably connected to the height adjustment screw (13); the threaded structure of the height adjustment screw (13) is screwed to the main support column (11).

8. A welding machine for steel shed installation according to claim 7, characterized in that, The telescopic support column (15) is rotatably connected to casters (17) for laterally moving along the surface of the main steel beam (51).

9. A welding machine for steel shed installation according to claim 7, characterized in that, A safety strap (18) is fixed to one side of the bottom of the arc frame (1); a restraining buckle (19) is fixed to the other side of the bottom of the arc frame (1); the safety strap (18) is wrapped around the restraining buckle (19).

10. A welding machine for steel shed installation according to claim 9, characterized in that, Several anti-slip pads (181) are fixed to the safety strap (18).