Automatic welding device for steel arch production line

Abstract

The invention relates to the technical field of metal welding, and discloses a steel arch production line automatic welding device which comprises a workbench, a fixing disc is arranged above the workbench and can move horizontally, and two rotatable first electric telescopic rods are installed on the outer wall of the fixing disc. The total length of the two first electric telescopic rods and the clamping assembly is adjusted to reach the radius value of the arch frame, the clamping assembly is driven to clamp different positions of the arch frame, the axes of the telescopic rods coincide with the radius line of the arch frame, and the theoretical circle center is automatically determined according to the geometric principle; then the positioning assembly is controlled to drive the flange plate to abut against the end face of the arch frame, and two circle centers are automatically aligned; and finally, high-precision welding is completed by the welding assembly. According to the device, automatic positioning and maintaining of the circle center are achieved, the quality problems of bolt hole dislocation, welding stress concentration and the like caused by concentricity deviation in a traditional technology are solved, and the flange welding precision, efficiency and reliability are greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of metal welding, in particular to an automatic welding device for a steel arch production line. Background Art

[0002] Steel arches are core permanent support components in tunnels and underground projects. Their critical importance lies in directly bearing the pressure of the surrounding rock, preventing collapse and deformation, and forming a stable support framework to ensure long-term structural safety. To meet transportation and lifting requirements, they must be assembled on-site from multiple curved segments. Welded flanges provide these segments with standardized, high-strength, high-rigidity connection nodes. These welded flanges reliably transmit significant loads through bolt preload and enable rapid and precise alignment through flange holes. These flanges are key to ensuring the mechanical performance and construction efficiency of the entire support system.

[0003] For example, Chinese patent publication number CN115070300A relates to a steel arch frame flange welding device and a steel arch frame automatic processing system. A flange welding robot is installed on the frame of the steel arch frame flange welding device, and a photoelectric sensor is arranged on the frame. When it detects that the steel arch frame moves to the clamping assembly, a detection signal is sent; the clamping assembly includes a base frame and a clamping arm, and a driving assembly is installed on the base frame; after the controller receives the detection signal, the driving assembly moves the clamping arm close to the base frame; the controller receives the second completion signal and moves the clamping arm away from the base frame; for the flange welding robot, the controller controls the clamping of the steel arch frame, starts welding, and after the welding is completed, the front of the steel arch frame sends a first completion signal to the controller; the controller rotates the rotating assembly forward, starts welding, and the back of the welded steel arch frame sends a second completion signal to the controller; for the rotating assembly, the controller receives the first completion signal and rotates the clamping assembly forward by a preset angle; the controller moves the clamping arm away from the base frame, driving the clamping assembly to rotate in the opposite direction by a preset angle.

[0004] However, when welding the arc-shaped arch and the flange, the device cannot ensure that the center of the two flanges to be welded accurately coincides with the theoretical center of the steel arch. This may cause the flanges after welding to have imperceptible concentricity deviations, resulting in the inability of high-strength bolts to penetrate the connection holes during subsequent on-site installation. Summary of the Invention

[0005] The object of the present invention is to provide an automatic welding device for a steel arch production line to solve at least one technical problem existing in the above-mentioned prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solutions: an automatic welding device for a steel arch production line, comprising a workbench, a fixed plate disposed above the workbench, the fixed plate being capable of horizontal movement, two rotatable first electric telescopic rods being mounted on an outer wall of the fixed plate, the two first electric telescopic rods each having a clamping assembly capable of securing the arch mounted on one end away from the fixed plate, wherein when the clamping assembly completes clamping the arch, the clamping assembly and the first electric telescopic rod are in a straight line and coincide with a radius line of the arch;

[0007] It also includes a positioning assembly, which can clamp the flange and drive the flange close to the end of the arch;

[0008] It also includes a welding assembly installed on the top of the workbench. When the positioning assembly aligns the flange and the end of the arch, the welding assembly can weld the two.

[0009] Preferably, the clamping assembly includes a first fixing member, a plurality of limit rods are fixedly installed on the inner wall of the first fixing member, a rotatable rotating ring is installed on the inner wall of the first fixing member, and the rotating ring is provided with a plurality of penetrating arc grooves, each of the limit rods can be in the corresponding arc groove, a fixing ring is also fixedly installed on the outer wall of the first fixing member, a plurality of locking blocks are rotatably installed on the outer wall of the fixing ring, a connecting rod is rotatably installed on the outer wall of each locking block, and an end of each connecting rod away from the locking block is rotatably connected to the rotating ring, and the first fixing member is connected to the first electric telescopic rod through a connecting member.

[0010] Preferably, the connecting member includes a fixed rod fixedly connected to the outer wall of the first fixing member, the fixed rod is rotatably connected to the output end of the first electric telescopic rod, the diameter of the fixed rod is equal to the outer diameter of the output end of the first electric telescopic rod, a sliding sleeve is slidably installed on the outer wall of the output end of the first electric telescopic rod, the inner diameter of the sliding sleeve is equal to the diameter of the fixed rod, and a spring is connected between the sliding sleeve and the output end of the first electric telescopic rod, a threaded hole is provided on the outer wall of the sliding sleeve, and a screw is installed in the threaded hole.

[0011] Preferably, a through slot is provided on the outer wall of the first fixing member, a shift rod is fixedly connected to the outer wall of the rotating ring, and the shift rod passes through the slot of the first fixing member and extends out of the outside of the first fixing member, a locking sleeve is slidably mounted on the outer wall of the shift rod, and a locking groove is provided on the outer wall of the first fixing member for the locking sleeve to be embedded in.

[0012] Preferably, the two first electric telescopic rods are fixedly connected to an arc-shaped slider at one end close to the fixed plate, and the two arc-shaped sliders are slidably installed on the outer wall of the fixed plate, the top of one of the arc-shaped sliders is fixedly connected to the first arc-shaped rack, and the bottom of the other arc-shaped slider is fixedly connected to the second arc-shaped rack, and the fixed plate is provided with a through arc groove, which can allow the first arc-shaped rack and the second arc-shaped rack to extend into the interior of the fixed plate, and a rotatable first gear is installed at the top of the fixed plate, and the first gear is meshed with the first arc-shaped rack, and a rotatable outer gear ring is installed at the bottom of the fixed plate, and the outer gear ring is meshed with the second arc-shaped rack, and the rotation direction of the outer gear ring is opposite to that of the first gear.

[0013] Preferably, a third gear is installed at the inner bottom of the first gear, and the third gear is coaxially fixedly connected to the first gear. A second gear is also rotatably installed at the bottom of the fixed plate, and the second gear is meshed with the third gear. The outer gear ring is provided with internal teeth, and the second gear is meshed with the internal teeth of the outer gear ring.

[0014] Preferably, the positioning assembly includes two second electric telescopic rods rotatably mounted on the outer wall of the fixed plate, each of the second electric telescopic rods is connected to a second clamping assembly through a connecting piece, the second clamping assembly includes a second fixing piece, the internal structure of the second fixing piece is consistent with that of the first fixing piece, and a plurality of positioning rods are fixedly mounted on the outer wall of the second fixing piece.

[0015] Preferably, laser emitters are fixedly mounted on the outer walls of the two opposite sides of the first fixing members, and a laser position sensing screen is fixedly mounted on the top of the workbench. The laser position sensing screen can receive the laser emitted by the laser emitter and complete positioning.

[0016] Preferably, rollers are rotatably mounted on the bottom of both the first fixing member and the second fixing member.

[0017] Preferably, the welding assembly includes two flange welding robots fixedly connected to the top of the workbench.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] This invention adjusts the combined length of the two first electric telescopic rods and the clamping assembly to the arch radius, actuating the clamping assembly to clamp the arch at different positions, aligning the telescopic rod axis with the arch radius. This automatically determines the theoretical center of the circle using geometric principles. The positioning assembly then controls the flange to align with the arch end face, ensuring automatic alignment of the two center points. Finally, the welding assembly completes the high-precision welding. This device automatically locates and maintains the center point, resolving quality issues in traditional processes such as bolt hole misalignment and weld stress concentration caused by concentricity deviation, significantly improving the accuracy, efficiency, and reliability of flange welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a front perspective view of the present invention;

[0021] Figure 2 It is a top view and a partial structure enlarged view of the present invention;

[0022] Figure 3 It is a right side sectional view of a part of the structure of the present invention;

[0023] Figure 4 Schematic diagram of the welding robot in the present invention;

[0024] Figure 5 A schematic top view of the intersection of two laser emitter rays in the present invention;

[0025] Figure 6 It is a front cross-sectional schematic diagram of the fixing member in the present invention;

[0026] Figure 7 It is a three-dimensional schematic diagram of the arc-shaped slider in the present invention;

[0027] Figure 8 This is an exploded schematic diagram of the connecting flange of the fixing member in the present invention;

[0028] Figure 9 It is a three-dimensional cross-sectional view of the arc-shaped rack in the present invention.

[0029] In the figure: 1. workbench; 2. arch; 301. first fixing member; 302. second fixing member; 4. fixing plate; 501. first electric telescopic rod; 502. second electric telescopic rod; 6. laser emitter; 7. laser position sensing screen; 8. sliding sleeve; 9. screw; 10. locking groove; 11. shift rod; 12. positioning rod; 13. spring; 14. first gear; 15. second gear; 16. third gear; 17. roller; 18. flange welding robot; 19. locking sleeve; 20. rotating ring; 21. limiting rod; 22. arc groove; 23. fixing ring; 24. locking block; 25. connecting rod; 26. fixing rod; 27. arc slider; 281. first arc rack; 282. second arc rack; 29. ​​outer gear ring. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] See also Figures 1 to 9The present invention provides a technical solution: an automatic welding device for a steel arch production line, comprising a workbench 1, a fixed plate 4 is provided above the workbench 1, the fixed plate 4 is capable of horizontal movement, two rotatable first electric telescopic rods 501 are installed on the outer wall of the fixed plate 4, and the ends of the two first electric telescopic rods 501 away from the fixed plate 4 are both equipped with clamping assemblies capable of fixing the arch 2. When the clamping assemblies complete clamping the arch 2, the clamping assemblies and the first electric telescopic rods 501 are in the same straight line and coincide with the radius line of the arch 2;

[0032] It also includes a positioning assembly that can clamp the flange and drive the flange close to the end of the arch 2;

[0033] It also includes a welding assembly installed on the top of the workbench 1. When the positioning assembly aligns the flange and the end of the arch 2, the welding assembly can weld the two.

[0034] See Figure 1 When using this device, first measure the radius of the arch 2, and then adjust the two first electric telescopic rods 501 to extend and retract them so that the total length of the first electric telescopic rods 501 and the clamping assembly is equal to the radius of the arch 2. Then, by rotating the two first electric telescopic rods 501, the two clamping assemblies are located at different positions on the arch 2, and the two positions of the arch 2 are fixed by the clamping assemblies. The two clamping assemblies can firmly fix the arch 2 to complete the formation of a stable triangular clamp for the entire arch 2.

[0035] When the arch frame 2 is clamped, the clamping assembly is aligned with the normal direction of the arc surface of the arch frame 2. At this time, the clamping assembly and the first electric telescopic rod 501 are in the same straight line. Then the center line of the clamping assembly, the axis of the first electric telescopic rod 501, and the radius line of the arch frame 2 at the clamping point coincide with each other on the same straight line. Moreover, since the common length of the first electric telescopic rod 501 and the clamping assembly is the radius length of the arch frame 2, the intersection of the extension lines of the two first electric telescopic rods 501 is the theoretical center of the arch frame 2 (i.e., the center of the fixed plate 4), thereby completing the clamping of the arch frame 2. After the center of the circle is determined, the positioning component is controlled to move so that it clamps the flange and approaches the end of the arch 2 until the flange fits tightly against the end face of the arch 2. Since the center of the arch 2 has been precisely fixed, this process can ensure that the center of the flange is automatically aligned with the center of the arch 2. Finally, the welding component is started to weld the aligned flange and the end face of the arch 2. Since the two have high concentricity, the welding process is smooth and the weld is uniform, which effectively avoids installation difficulties and welding stress problems caused by concentricity deviation, greatly improving the welding quality and efficiency.

[0036] Furthermore, the clamping assembly includes a first fixing member 301, a plurality of limit rods 21 are fixedly installed on the inner wall of the first fixing member 301, a rotatable rotating ring 20 is installed on the inner wall of the first fixing member 301, and the rotating ring 20 is provided with a plurality of penetrating arc grooves 22, each limit rod 21 can be in the corresponding arc groove 22, and a fixing ring 23 is also fixedly installed on the outer wall of the first fixing member 301, a plurality of locking blocks 24 are rotatably installed on the outer wall of the fixing ring 23, and a connecting rod 25 is rotatably installed on the outer wall of each locking block 24, and each connecting rod 25 is rotatably connected to the rotating ring 20 at one end away from the locking block 24, and the first fixing member 301 is connected to the first electric telescopic rod 501 through a connecting member.

[0037] See Figure 6 When the arch frame 2 needs to be clamped and fixed, the two arch frames 2 are first inserted into the inner rings of the two first fixing members 301, and the rotating ring 20 is driven to rotate by the external driving component. When the rotating ring 20 rotates, the arc groove 22 cooperates with the limit rod 21, so that the rotating ring 20 can only rotate at a limited angle. The rotation of the rotating ring 20 pushes the locking block 24 close to the arch frame 2 through each group of connecting rods 25, and the circular motion of the rotating ring 20 is converted into the synchronous radial motion of the locking block 24, so that the locking block 24 contracts centripetally to clamp the arch frame 2. Through the synchronous radial motion of multiple groups of evenly distributed locking blocks 24, uniform and stable clamping of the large curvature arch frame 2 can be achieved, avoiding local stress concentration. In addition, the amplification mechanism composed of the connecting rod 25 and the rotating ring 20 can generate a large clamping force with a small input torque, and the operation is labor-saving and reliable. When the rotating ring 20 rotates in the opposite direction, the locking block 24 is pushed to expand centrifugally to loosen the arch frame 2, completing the unlocking process of the arch frame 2.

[0038] Furthermore, the connecting member includes a fixed rod 26 fixedly connected to the outer wall of the first fixing member 301, the fixed rod 26 is rotatably connected to the output end of the first electric telescopic rod 501, the diameter of the fixed rod 26 is equal to the outer diameter of the output end of the first electric telescopic rod 501, and a sliding sleeve 8 is slidably installed on the outer wall of the output end of the first electric telescopic rod 501. The inner diameter of the sliding sleeve 8 is equal to the diameter of the fixed rod 26, and a spring 13 is connected between the sliding sleeve 8 and the output end of the first electric telescopic rod 501. A threaded hole is provided on the outer wall of the sliding sleeve 8, and a screw 9 is installed in the threaded hole.

[0039] See Figure 6After the arch frame 2 is clamped by rotating the rotating ring 20, the first electric telescopic rod 501 is rotated so that its output end is in the same straight line as the fixed rod 26. When the first electric telescopic rod 501 and the fixed rod 26 are in the same straight line, the sliding sleeve 8 is driven to move toward the fixed rod 26 under the action of the spring 13, so that the inner wall of the sliding sleeve 8 can be simultaneously sleeved on the output end of the first electric telescopic rod 501 and the outer periphery of the fixed rod 26. By utilizing the matching of equal diameters, the two are quickly locked in the same straight line, initially forming a rigid integral structure.

[0040] Among them, it is worth mentioning that in order to improve the reliability and shock resistance of the connection, the screw 9 can be rotated so that its end can tightly press against the outer wall of the fixing rod 26, and the final mechanical locking is achieved through strong friction force, ensuring that the subsequent welding process can be more stable and preventing swinging during the welding process.

[0041] Furthermore, a through slot is provided on the outer wall of the first fixing member 301, a shift rod 11 is fixedly connected to the outer wall of the rotating ring 20, and the shift rod 11 passes through the slot of the first fixing member 301 and extends out of the outside of the first fixing member 301, a locking sleeve 19 is slidably installed on the outer wall of the shift rod 11, and a locking groove 10 is provided on the outer wall of the first fixing member 301 for the locking sleeve 19 to be embedded in.

[0042] See Figure 6 When it is necessary to complete the clamping purpose of the arch frame 2, the staff manually rotates the lever 11, thereby driving the locking sleeve 19 on its outer wall and the rotating ring 20 to rotate synchronously. When the rotating ring 20 rotates to the predetermined position to clamp the arch frame 2, the locking sleeve 19 is pressed down so that it can be buckled into the locking groove 10. The locking groove 10 and the locking sleeve 19 can form a stable mechanical interlock, which effectively limits the rotation of the lever 11, thereby preventing the rotating ring 20 from flipping or loosening due to vibration or accidental touch, ensuring that the clamping assembly can provide stable clamping force during operation.

[0043] Furthermore, the two first electric telescopic rods 501 are fixedly connected to one end of the fixed plate 4 with an arc-shaped slider 27, and the two arc-shaped sliders 27 are slidably installed on the outer wall of the fixed plate 4. The top of one arc-shaped slider 27 is fixedly connected to the first arc-shaped rack 281, and the bottom of the other arc-shaped slider 27 is fixedly connected to the second arc-shaped rack 282. The fixed plate 4 is provided with a through arc groove, which allows the first arc-shaped rack 281 and the second arc-shaped rack 282 to extend into the interior of the fixed plate 4. A rotatable first gear 14 is installed at the top of the fixed plate 4, and the first gear 14 is engaged with the first arc-shaped rack 281. A rotatable outer gear ring 29 is installed at the bottom of the fixed plate 4, and the outer gear ring 29 is engaged with the second arc-shaped rack 282, and the rotation direction of the outer gear ring 29 is opposite to that of the first gear 14.

[0044] Furthermore, a third gear 16 is installed at the bottom inner of the first gear 14, and the third gear 16 is coaxially fixedly connected to the first gear 14. A second gear 15 is also rotatably installed at the bottom of the fixed plate 4, and the second gear 15 is engaged with the third gear 16. The outer gear ring 29 is provided with internal teeth, and the second gear 15 is engaged with the internal teeth of the outer gear ring 29.

[0045] See Figure 9 After the arch 2 is clamped by rotating the rotating ring 20, the motor-driven spring 13 and the first gear 14 fixed on the top of the fixed plate 4 are started to rotate. The first gear 14 drives the first arc-shaped rack 281 meshed therewith to move in the same direction, thereby driving an arc-shaped slider 27 and the first electric telescopic rod 501 thereon to slide along the guide rail of the fixed plate 4. At the same time, the rotation of the first gear 14 is transmitted to the third gear 16 through its rotating shaft, thereby driving the second gear 15 meshed therewith to rotate in the opposite direction. The outer gear ring 29 and the third gear 16 are rotated in the opposite direction through the second gear 15. Since the outer gear ring 29 is meshed with the second arc-shaped rack 282, the second arc-shaped rack 282 and the third gear 16 are rotated in the opposite direction, that is, the second arc-shaped rack 282 and the third gear 16 are finally rotated. The first arc-shaped rack 281 rotates in the opposite direction to achieve synchronous, symmetrical and reverse movement of the two first electric telescopic rods 501. No matter where the staff places the two clamping components on the arch frame 2, the system can automatically drive them to move synchronously toward or away from each other until the extended lines of the axes of the two first electric telescopic rods 501 intersect at the theoretical center of the arch frame 2. Moreover, the synchronous reverse movement means that the two clamping components are always symmetrical about the center of the circle, which makes the clamping forces they apply to the arch frame 2 equal in magnitude and symmetrical in direction, avoiding distortion, deformation or positioning drift of the arch frame 2 due to unilateral or uneven force. The symmetrical clamping force ensures that the arch frame 2 is stably and reliably fixed at the theoretical center position during the processing process and will not move due to vibration or external force.

[0046] Furthermore, the positioning assembly includes two second electric telescopic rods 502 rotatably mounted on the outer wall of the fixed plate 4, each second electric telescopic rod 502 is connected to a second clamping assembly through a connecting member, and the second clamping assembly includes a second fixing member 302, the internal structure of the second fixing member 302 is consistent with the first fixing member 301, and a plurality of positioning rods 12 are fixedly mounted on the outer wall of the second fixing member 302.

[0047] See Figure 1 、 Figure 2 as well as Figure 8After the center of the arch 2 is determined, the operator puts the flange on the positioning rod 12 on the outer wall of the second fixing member 302 to prevent it from rotating in the circumferential direction. The outer wall of the sleeve of the flange is clamped by the clamping structure inside the positioning rod 12, so that the flange is firmly clamped and the firmly clamped flange is pushed to move along a straight path toward the end of the arch 2 with the center determined. By rotating the second electric telescopic rod 502 to approach the end of the arch 2, until the flange coincides with the end face of the arch 2, thereby completing the docking purpose.

[0048] Furthermore, laser emitters 6 are fixedly mounted on the outer walls of the two opposite sides of the first fixing members 301 , and a laser position sensing screen 7 is fixedly mounted on the top of the workbench 1 . The laser position sensing screen 7 can receive the laser emitted by the laser emitter 6 and complete positioning.

[0049] See Figure 5 When the two first fixing members 301 complete the clamping of the arch frame 2 through their internal structure and complete the positioning of the center of the arch frame 2, the two laser emitters 6 are then fixed in the specific radial direction of the arch frame 2. When the laser emitter 6 is turned on, two laser beams will be irradiated onto the distant laser position sensing screen 7, forming two light spots. If the mechanical positioning is accurate, the extension lines of the two laser beams should intersect at the theoretical center of the circle, and the two light spots displayed on the laser position sensing screen 7 should coincide at one point (or be within the preset allowable error range). If there is a deviation in the center positioning, the two light spots will separate on the screen, and the distance and direction of the separation directly reflect the size and direction of the center deviation.

[0050] Among them, it is worth noting that the two second fixing members 302 can be used to complete the clamping of the arch frame 2 first, and the two first fixing members 301 can be rotated synchronously in opposite directions by starting the motor on the top of the fixed plate 4. When the two first fixing members 301 rotate, the laser emitter 6 installed on the first fixing member 301 moves along with it, and the laser emitted by it will also move the light spot on the laser position sensing screen 7. If the two light spots always remain overlapping on the screen or the midpoint of their connecting line is stable at one point, it proves that the center of the circle of the current mechanical positioning is accurate. If the two light spots separate, the direction and size of the center deviation can be judged according to the direction and distance of their separation, and the horizontal position of the fixed plate 4 can be manually fine-tuned until the two light spots always remain overlapping during the rotation process, so that the center position can be accurately corrected.

[0051] Furthermore, rollers 17 are rotatably mounted on the bottom of both the first fixing member 301 and the second fixing member 302 .

[0052] See Figure 6, rollers 17 are installed on the top of the first fixing member 301 and the second fixing member 302, which can convert the sliding friction between the clamping assembly and the top of the workbench 1 into rolling friction, allowing the operator to easily and effortlessly push the heavy fixing members to slide along the curved surface of the arch frame 2, greatly reducing the operating intensity and time cost when adjusting the clamping position.

[0053] Furthermore, the welding assembly includes two flange welding robots 18 fixedly connected to the top of the workbench 1.

[0054] The welding assembly includes two flange welding robots 18 fixedly connected to both sides of the top of the workbench 1 by high-strength bolts. The two robots are symmetrically arranged on the left and right sides of the axis of the arch frame 2. The range of movement of their robotic arms covers the entire circumferential seam where the flange plate and the arch frame 2 are connected. Each flange welding robot 18 adopts a six-axis linkage structure, and is equipped with a welding gun, a laser vision sensor, and a gun cleaning and wire cutting device at the end, and realizes real-time communication with the main control system through a built-in control cabinet.

[0055] The standard parts used in this embodiment can be purchased directly from the market, and the non-standard structural components recorded in the specification and drawings can also be directly processed according to existing technical common sense without any doubt. At the same time, the connection method of each component adopts the mature conventional means in the existing technology, and the machinery, parts and equipment all adopt conventional models in the existing technology, so no specific description will be given here.

[0056] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An automatic welding device for a steel arch production line, comprising a workbench (1), characterized in that: A fixed plate (4) is provided above the workbench (1), and the fixed plate (4) is capable of horizontal movement. Two rotatable first electric telescopic rods (501) are installed on the outer wall of the fixed plate (4), and a clamping assembly capable of fixing the arch frame (2) is installed at one end of the two first electric telescopic rods (501) away from the fixed plate (4). When the clamping assembly completes clamping the arch frame (2), the clamping assembly and the first electric telescopic rod (501) are in the same straight line and coincide with the radius line of the arch frame (2); It also includes a positioning assembly, which can clamp the flange and drive the flange close to the end of the arch (2); It also includes a welding assembly installed on the top of the workbench (1). When the positioning assembly aligns the flange and the end of the arch (2), the welding assembly can weld the two.

2. The automatic welding device for a steel arch production line according to claim 1, characterized in that: The clamping assembly includes a first fixing member (301), a plurality of limiting rods (21) are fixedly installed on the inner wall of the first fixing member (301), a rotatable rotating ring (20) is installed on the inner wall of the first fixing member (301), and the rotating ring (20) is provided with a plurality of penetrating arc grooves (22), each of the limiting rods (21) can be in the corresponding arc groove (22), a fixing ring (23) is also fixedly installed on the outer wall of the first fixing member (301), a plurality of locking blocks (24) are rotatably installed on the outer wall of the fixing ring (23), and a connecting rod (25) is rotatably installed on the outer wall of each locking block (24), and an end of each connecting rod (25) away from the locking block (24) is rotatably connected to the rotating ring (20), and the first fixing member (301) is connected to the first electric telescopic rod (501) through a connecting member.

3. The automatic welding device for a steel arch production line according to claim 2, characterized in that: The connecting member comprises a fixing rod (26) fixedly connected to the outer wall of the first fixing member (301), the fixing rod (26) being rotatably connected to the output end of the first electric telescopic rod (501), the diameter of the fixing rod (26) being equal to the outer diameter of the output end of the first electric telescopic rod (501), a sliding sleeve (8) being slidably mounted on the outer wall of the output end of the first electric telescopic rod (501), the inner diameter of the sliding sleeve (8) being equal to the diameter of the fixing rod (26), a spring (13) being connected between the sliding sleeve (8) and the output end of the first electric telescopic rod (501), a threaded hole being provided on the outer wall of the sliding sleeve (8), and a screw (9) being mounted in the threaded hole.

4. The automatic welding device for a steel arch production line according to claim 2, characterized in that: The outer wall of the first fixing member (301) is provided with a through notch, the outer wall of the rotating ring (20) is fixedly connected with a shifting rod (11), and the shifting rod (11) passes through the notch of the first fixing member (301) and extends out of the first fixing member (301), a locking sleeve (19) is slidably mounted on the outer wall of the shifting rod (11), and the outer wall of the first fixing member (301) is provided with a locking groove (10) for the locking sleeve (19) to be embedded.

5. The automatic welding device for a steel arch production line according to claim 2, characterized in that: The ends of the two first electric telescopic rods (501) close to the fixed disk (4) are fixedly connected to arc-shaped sliders (27), and the two arc-shaped sliders (27) are slidably mounted on the outer wall of the fixed disk (4), the top of one of the arc-shaped sliders (27) is fixedly connected to the first arc-shaped rack (281), and the bottom of the other arc-shaped slider (27) is fixedly connected to the second arc-shaped rack (282), and the fixed disk (4) is provided with a through arc groove, which allows the first arc-shaped rack (281) and the second arc-shaped rack (282) to extend into the fixed disk (4), and a rotatable first gear (14) is mounted on the top of the fixed disk (4), and the first gear (14) is meshed with the first arc-shaped rack (281), and a rotatable outer gear ring (29) is mounted on the bottom of the fixed disk (4), and the outer gear ring (29) is meshed with the second arc-shaped rack (282), and the outer gear ring (29) rotates in the opposite direction to the first gear (14).

6. The automatic welding device for a steel arch production line according to claim 5, characterized in that: A third gear (16) is mounted on the bottom of the first gear (14), and the third gear (16) is coaxially fixedly connected to the first gear (14). A second gear (15) is also rotatably mounted on the bottom of the fixed plate (4), and the second gear (15) meshes with the third gear (16). The outer gear ring (29) is provided with internal teeth, and the second gear (15) meshes with the internal teeth of the outer gear ring (29).

7. The automatic welding device for a steel arch production line according to claim 4, characterized in that: The positioning assembly comprises two second electric telescopic rods (502) rotatably mounted on the outer wall of the fixed plate (4), each of the second electric telescopic rods (502) being connected to a second clamping assembly via a connecting member, the second clamping assembly comprising a second fixing member (302), the internal structure of the second fixing member (302) being consistent with that of the first fixing member (301), and a plurality of positioning rods (12) being fixedly mounted on the outer wall of the second fixing member (302).

8. The automatic welding device for a steel arch production line according to claim 7, characterized in that: Laser emitters (6) are fixedly mounted on the outer walls of the two first fixing members (301) on opposite sides, and a laser position sensing screen (7) is fixedly mounted on the top of the workbench (1). The laser position sensing screen (7) can receive laser light emitted by the laser emitter (6) and complete positioning.

9. The automatic welding device for a steel arch production line according to claim 5, characterized in that: Rollers (17) are rotatably mounted on the bottoms of both the first fixing member (301) and the second fixing member (302).

10. The automatic welding device for a steel arch production line according to any one of claims 1 to 9, characterized in that: The welding assembly comprises two flange welding robots (18) fixedly connected to the top of the workbench (1).

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