Submerged-arc welding device for C-shaped steel

Abstract

The utility model relates to the technical field of welding equipment, and discloses a C-shaped steel submerged-arc welding device which comprises a base and a truss, a mounting plate is arranged on the truss in a lifting mode, a welding gun and a welding flux box are installed on the mounting plate, two workpieces to be welded are placed on the base in a butt joint and attached mode, the position to be welded is located under the welding gun, and the welding flux box is located in front of the welding gun. A wire feeding box is arranged on the mounting plate, a first wire feeding wheel and a second wire feeding wheel are distributed in the wire feeding box in the horizontal direction, a sliding groove is formed in the side wall of the wire feeding box, a sliding block is arranged in the sliding groove in a sliding mode, a rotating shaft of the first wire feeding wheel penetrates through the sliding block and is in running fit with the sliding block, and a first elastic piece is arranged in the sliding groove. The side, located on the sliding block and deviating from the second wire feeding wheel, of the first elastic piece abuts against the inner end wall of the sliding groove and the sliding block, a driving assembly is arranged on the wire feeding box and drives the first wire feeding wheel and the second wire feeding wheel to rotate relatively, and the welding wires are conveyed to the welding gun through friction. The C-shaped steel welding device has the effect of improving the C-shaped steel welding quality.

Description

Technical Field

[0001] This application relates to the field of welding equipment technology, and in particular to a C-shaped steel submerged arc welding apparatus. Background Technology

[0002] C-shaped steel, as a key component in the steel structure field, is widely used in various construction projects, bridge construction, and machinery manufacturing industries due to its unique cross-sectional shape and excellent mechanical properties. Efficient and high-quality C-shaped steel welding technology can effectively improve the overall strength and durability of steel structures, reduce subsequent maintenance costs, and is of great significance for promoting the healthy development of related industries.

[0003] In existing technologies, C-shaped steel welding mainly employs two methods: manual electric arc welding and semi-automatic submerged arc welding. Manual electric arc welding relies on the welder manually operating the welding rod, using the high temperature generated by the arc to melt and fuse the base material and the welding rod. This method is simple to operate, has low equipment costs, and is suitable for some small-scale projects and complex welding environments. However, because it relies entirely on manual skills, the welding quality is greatly affected by the welder's experience and condition, the welding speed is slow, and the production efficiency is low, making it difficult to meet the needs of large-scale production. Semi-automatic submerged arc welding, on the other hand, is an improvement on manual electric arc welding. It uses a tracked trolley to move the workpiece to be welded, thus improving the automation and efficiency of the welding process to a certain extent.

[0004] However, the aforementioned semi-automatic submerged arc welding technology has significant shortcomings, with the inability to adjust the clamping force being particularly prominent. When the wire feeding wheel is used with welding wires of different diameters, the clamping distance is not adjustable. This results in insufficient clamping force when feeding small-diameter welding wires, leading to unstable wire feeding and poor weld formation. Conversely, excessive clamping force when feeding large-diameter welding wires may damage the wire, reduce its service life, and ultimately affect the welding quality. Utility Model Content

[0005] To improve the welding quality of C-shaped steel, this application provides a C-shaped steel submerged arc welding apparatus.

[0006] The C-shaped steel submerged arc welding device provided in this application adopts the following technical solution:

[0007] A C-shaped steel submerged arc welding device includes a base and a truss mounted on the base. A mounting plate is ellipsably mounted on the truss, and a welding torch and flux box are mounted on the mounting plate. Two workpieces to be welded are placed butt-to-butt on the base, with the weld seam located directly below the welding torch. The flux box is located in front of the welding torch. A wire spool is mounted on the top of the truss. A wire feed box is positioned on the mounting plate between the welding torch and the wire spool. A first wire feed wheel and a second wire feed wheel are horizontally distributed within the wire feed box. A sidewall of the wire feed box provides a space for the first wire feed wheel to move horizontally. The device includes a sliding groove, with one groove at each end corresponding to the rotating shaft of the first wire feeding wheel. A slider is slidably disposed in each groove, and the rotating shaft of the first wire feeding wheel passes through the slider and rotates in cooperation with it. A first elastic element is disposed in each groove, located on the side of the slider away from the second wire feeding wheel, abutting against the inner end wall of the groove and the slider. A drive assembly is disposed on the wire feeding box, and the welding wire passes through the first wire feeding wheel and the second wire feeding wheel. The drive assembly drives the first wire feeding wheel and the second wire feeding wheel to rotate relative to each other, and the welding wire is transmitted to the welding gun through friction.

[0008] By adopting the above technical solution, during the submerged arc welding of C-shaped steel, the two workpieces to be welded are placed butt-to-butt on the base, with the weld seam directly below the welding torch. The flux box is located in front of the welding torch, allowing for pre-placement of flux. Simultaneously, the welding wire on the wire spool at the top of the truss passes through the first and second wire feeding wheels in the wire feeding box. The drive assembly drives the two wire feeding wheels to rotate relative to each other, using friction to transfer the welding wire to the welding torch for welding. The wire feeding box has a groove on its side wall, and the shaft of the first wire feeding wheel slides within the groove via a slider. Each groove contains a first elastic element that abuts against the slider, allowing the first wire feeding wheel to adaptively translate according to the welding wire diameter, thereby adjusting the clamping force on the welding wire. This solves the problem caused by the inability to adjust the clamping force, effectively improving the welding quality of the C-shaped steel.

[0009] Optionally, the drive assembly includes a first synchronous pulley sleeved on the end of the first wire feeding wheel, a drive wheel sleeved on the end of the second wire feeding wheel, a stepper motor coaxially connected to the drive wheel, a second synchronous pulley meshing with the drive wheel, and a synchronous belt that meshes with both the first and second synchronous pulleys. The second synchronous pulley is located on the side of the drive wheel away from the first synchronous pulley and is rotatably mounted on the outer wall of the wire feeding box. The wire feeding box is also provided with a tension rod, the synchronous belt is wound around the tension rod, and the wire feeding box is provided with an adjusting member that drives the tension rod to adjust vertically to maintain the synchronous belt in transmission engagement with the first and second synchronous pulleys.

[0010] By adopting the above technical solution, the stepper motor drives the drive wheel to rotate, which in turn drives the meshing second synchronous wheel to rotate. Simultaneously, the drive wheel also causes the second wire feeding wheel to rotate, which in turn drives the first synchronous wheel to rotate via a synchronous belt, thus causing the first wire feeding wheel to rotate. This achieves relative rotation between the first and second wire feeding wheels to deliver the welding wire. During this process, the adjusting mechanism on the wire feeding box can vertically adjust the tension rod, thereby maintaining the transmission engagement between the synchronous belt and the first and second synchronous wheels. This ensures that the drive assembly stably transmits power to the first and second wire feeding wheels, improving the stability and reliability of the wire feeding process, and ultimately enhancing the welding quality of the C-shaped steel.

[0011] Optionally, a vertical guide groove is provided on the wire feeding box between the first synchronous wheel and the driving wheel. A fixed block is provided in the guide groove. The adjusting component includes a tensioning block slidably disposed in the guide groove and a second elastic component that abuts against the tensioning block and the fixed block. The tensioning rod is disposed on the tensioning block. A set of the adjusting component and the tensioning rod are provided on both sides of the fixed block.

[0012] By adopting the above technical solution, when the welding wire diameter changes, the first wire feeding wheel can move within the groove and adjust its distance from the second wire feeding wheel through the compression or elastic recovery of the first elastic element to adapt to the welding wire. Simultaneously, the tensioning block of the adjusting element can slide within the guide groove. When the position of the first wire feeding wheel changes, causing a change in the tension of the synchronous belt, the second elastic element drives the tensioning block to slide within the guide groove, thereby vertically adjusting the tensioning rod and ensuring that the synchronous belt maintains good transmission engagement with both the first and second synchronous pulleys. This ensures the stability of power transmission during wire feeding, thereby ensuring that the welding wire can be stably transmitted from the wire feeding wheel to the welding torch, effectively improving the welding quality of C-shaped steel.

[0013] Optionally, a transmission wheel is rotatably sleeved on the tensioning rod, and the synchronous belt is engagedly sleeved on the transmission wheel.

[0014] By adopting the above technical solution, a transmission wheel is rotatably sleeved on the tensioning rod and the synchronous belt is engaged and sleeved on the transmission wheel, which can reduce the friction between the synchronous belt and the tensioning rod, reduce the wear of the synchronous belt, extend the service life of the synchronous belt, and improve the stability of the synchronous belt drive.

[0015] Optionally, the outer ring sidewalls of the first and second wire feeding wheels are both provided with V-shaped grooves, and the inner sidewalls of the grooves are provided with a number of strip-shaped protrusions.

[0016] By adopting the above technical solution, the V-shaped groove on the outer ring sidewall of the wire feeding wheel can better adapt to welding wires of different diameters, increase the contact area between the wire feeding wheel and the welding wire, and make the wire feeding process more stable; the strip-shaped protrusion on the inner sidewall of the groove can increase the friction between the wire feeding wheel and the welding wire, improve the reliability of the welding wire transmission, and thus improve the welding quality of C-shaped steel.

[0017] Optionally, the base has multiple conveying rollers distributed along the length direction perpendicular to the truss, the axial direction of the conveying rollers is parallel to the length direction of the truss, and a support plate is provided at the end of each conveying roller on the base, with the conveying roller rotatably connected between two support plates.

[0018] By adopting the above technical solution, multiple conveying rollers with an axial direction parallel to the length of the truss are distributed on the base along a direction perpendicular to the length of the truss, and the conveying rollers are rotatably connected by a support plate, which facilitates the conveying of the workpiece to be welded and facilitates subsequent welding operations.

[0019] Optionally, a clamping member is provided on the base between two adjacent conveying rollers. The clamping member includes a clamping seat that is slidably disposed on the base and a limiting roller disposed on opposite sides of the two clamping seats. A bidirectional lead screw is rotatably disposed on the base parallel to the axial direction of the conveying rollers. The threaded sections of the clamping seat and the bidirectional lead screw correspond one-to-one, and the clamping seat is rotated and sleeved on the threaded section of the bidirectional lead screw. The rotating shaft of the limiting roller is vertically disposed and rotatably connected to the side wall of the clamping seat.

[0020] By adopting the above technical solution, rotating the bidirectional lead screw causes the clamping seats to slide relative to each other. Since the threaded sections of the clamping seats correspond one-to-one with the threaded sections of the bidirectional lead screw and are fitted onto them through threaded rotation, the two clamping seats move closer or further apart, thereby causing the limiting rollers mounted on the clamping seats to move closer or further apart. This design effectively clamps and limits the workpiece to be welded, ensuring stable positioning during the welding process, reducing the risk of radial displacement or wobbling, and thus improving the welding quality of C-shaped steel.

[0021] Optionally, a fixed sleeve is slidably disposed on one end of the bidirectional lead screw on the base, and an internal spline is disposed inside the fixed sleeve. A driving block is coaxially disposed on the end of the bidirectional lead screw near the fixed sleeve, and an external spline is disposed on the outer ring of the driving block. When the fixed sleeve slides to be fitted onto the driving block, the internal spline and the external spline are engaged.

[0022] By adopting the above technical solution, when the bidirectional lead screw needs adjustment, the fixing sleeve is slid away from the drive block, releasing the interlocking fit between the inner and outer splines, allowing the bidirectional lead screw to rotate freely for easy clamping and adjustment. When the bidirectional lead screw needs to be fixed, the fixing sleeve is slid onto the drive block, allowing the inner and outer splines to interlock, thereby restricting the rotation of the bidirectional lead screw and fixing it. This makes the adjustment and fixing operations of the bidirectional lead screw more flexible and convenient, effectively improving the ease of use and stability of the C-shaped steel submerged arc welding device, and thus improving the positioning accuracy and welding quality of the workpiece during the welding process.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. In the submerged arc welding process of C-shaped steel, two workpieces to be welded are placed butt-to-butt on the base, with the weld seam directly below the welding torch. The flux box is located in front of the welding torch, allowing for pre-placement of flux. Simultaneously, the welding wire on the wire spool at the top of the truss passes through the first and second wire feeding wheels in the wire feeding box. The drive assembly drives the two wire feeding wheels to rotate relative to each other, using friction to transfer the welding wire to the welding torch for welding. The wire feeding box has a sliding groove on its side wall. The shaft of the first wire feeding wheel slides within the groove via a slider, and each groove contains a first elastic element that abuts against the slider. This allows the first wire feeding wheel to adaptively translate according to the welding wire diameter, thereby adjusting the clamping force on the welding wire. This solves the problem caused by the inability to adjust the clamping force, effectively improving the welding quality of the C-shaped steel.

[0025] 2. A stepper motor drives the drive wheel to rotate, which in turn drives the meshing second synchronous wheel to rotate. Simultaneously, the drive wheel also causes the second wire feeding wheel to rotate. The second synchronous wheel, in turn, drives the first synchronous wheel via a synchronous belt, which in turn causes the first wire feeding wheel to rotate. This achieves relative rotation between the first and second wire feeding wheels to feed the welding wire. During this process, the adjusting mechanism on the wire feeding box can vertically adjust the tension rod to maintain the transmission engagement between the synchronous belt and the first and second synchronous wheels. This ensures that the drive assembly stably transmits power to the first and second wire feeding wheels, improving the stability and reliability of the wire feeding process, thereby improving the welding quality of the C-shaped steel.

[0026] 3. When the welding wire diameter changes, the first wire feeding wheel can move within the groove and adjust its distance from the second wire feeding wheel by the compression or elastic recovery of the first elastic element to accommodate the welding wire. Simultaneously, the tensioning block of the adjusting element can slide within the guide groove. When the position of the first wire feeding wheel changes, causing a change in the tension of the synchronous belt, the second elastic element drives the tensioning block to slide within the guide groove, thereby vertically adjusting the tensioning rod. This ensures that the synchronous belt maintains good transmission engagement with both the first and second synchronous pulleys. This guarantees the stability of power transmission during wire feeding, thus ensuring that the welding wire is stably transmitted from the wire feeding wheel to the welding torch, effectively improving the welding quality of C-shaped steel. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0028] Figure 2 This is a schematic diagram illustrating the positional relationship between the welding torch and the flux box in an embodiment of this application.

[0029] Figure 3 This is a schematic diagram showing the positional relationship between the drive block and the fixed sleeve when the bidirectional lead screw is in the unlocked state according to an embodiment of this application.

[0030] Figure 4 This is a cross-sectional view illustrating the positional relationship between the first and second wire feeding wheels inside the wire feeding box in an embodiment of this application.

[0031] Figure 5 This is a schematic diagram illustrating the positional relationship between the first synchronous wheel, the drive wheel, and the second synchronous wheel on the wire feeding box in an embodiment of this application.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Base; 11. Fixing sleeve; 111. Internal spline; 2. Truss; 21. Hydraulic cylinder; 22. Vertical rail; 23. Mounting plate; 231. Welding torch; 232. Flux box; 24. Welding wire spool; 3. Conveying roller; 31. Support plate; 4. Clamping component; 41. Clamping seat; 42. Limiting roller; 5. Bidirectional lead screw; 51. Drive block; 511. External spline; 6. Wire feed box; 61. First wire feed wheel; 611 612. Groove; 62. Protrusion; 63. Second wire feeding wheel; 64. Slide groove; 65. Slider; 66. First elastic element; 67. Guide groove; 68. Fixing block; 79. Drive assembly; 70. First synchronous pulley; 71. Drive wheel; 72. Stepper motor; 73. Second synchronous pulley; 74. Synchronous belt; 80. Tensioning rod; 81. Transmission wheel; 91. Adjusting element; 92. Tensioning block; 93. Second elastic element. Detailed Implementation

[0034] The following is in conjunction with the appendix Figures 1-5 This application will be described in further detail.

[0035] This application discloses a C-shaped steel submerged arc welding apparatus.

[0036] Reference Figure 1 A C-shaped steel submerged arc welding device includes a base 1 and a truss 2. The truss 2 is located on the base 1 and is securely connected to the base 1. The cooperation between the two provides a stable support structure for the entire device. A mounting plate 23 is mounted on the truss 2 via a hydraulic cylinder 21. Two parallel vertical rails 22 are fixedly installed on the side wall of the truss 2. The mounting plate 23 is fitted onto the two vertical rails 22 and moves up and down along the truss 2 to facilitate adjustment of the welding height.

[0037] Reference Figure 2 The mounting plate 23 is equipped with a welding torch 231 and a flux box 232. Two workpieces to be welded are placed together on the base 1, with the weld seam located directly below the welding torch 231. This allows the welding torch 231 to accurately perform welding operations on the weld seam. The flux box 232 is located in front of the welding torch 231 and can provide the required flux for the welding process.

[0038] Reference Figure 1 Multiple conveying rollers 3 are distributed on the base 1 along the length direction perpendicular to the truss 2. In this embodiment, two are used as an example. The axial direction of the conveying rollers 3 is parallel to the length direction of the truss 2. A support plate 31 is fixedly provided on the base 1 corresponding to the end of each conveying roller 3. The conveying roller 3 is rotatably connected between the two support plates 31.

[0039] Reference Figure 1 and Figure 2 A clamping member 4 is provided on the base 1 between two adjacent conveying rollers 3. The clamping member 4 includes a clamping seat 41 and a limiting roller 42. A bidirectional lead screw 5 is provided on the base 1 in a direction parallel to the axial direction of the conveying rollers 3. The threaded sections of the clamping seat 41 correspond one-to-one with the threaded sections of the bidirectional lead screw 5, and the clamping seat 41 is sleeved on the threaded sections of the bidirectional lead screw 5 by the threaded rotation. The rotating shaft of the limiting roller 42 is arranged vertically and rotatably connected to the side wall of the clamping seat 41.

[0040] Reference Figure 2 and Figure 3A fixed sleeve 11 is slidably disposed on one end of the bidirectional lead screw 5 on the base 1. An inner spline 111 is disposed inside the fixed sleeve 11. A drive block 51 is coaxially fixedly disposed on the end of the bidirectional lead screw 5 near the fixed sleeve 11. An outer spline 511 is fixedly disposed on the outer ring of the drive block 51. When the fixed sleeve 11 slides to be fitted onto the drive block 51, the inner spline 111 and the outer spline 511 are engaged. When it is necessary to adjust the distance between the two limiting rollers 42, the fixing sleeve 11 is slid away from the drive block 51, and the drive block 51 is manually rotated to drive the bidirectional lead screw 5 to rotate. When the bidirectional lead screw 5 rotates, the two clamping seats 41 will move relative to each other or away from each other, thereby adjusting the distance between the limiting rollers 42 and clamping or releasing the workpiece to be welded. When it is necessary to fix the bidirectional lead screw 5, the fixing sleeve 11 is slid onto the drive block 51, so that the inner spline 111 and the outer spline 511 are engaged, thereby restricting the rotation of the bidirectional lead screw 5 and fixing the bidirectional lead screw 5.

[0041] Reference Figure 1 and Figure 2 A wire spool 24 is fixedly installed on the top of the truss 2 to store the welding wire. A wire feed box 6 is fixedly installed on the mounting plate 23 between the welding gun 231 and the wire spool 24. The wire feed box 6 is used to feed the welding wire.

[0042] Reference Figure 4 The first wire feeding wheel 61 and the second wire feeding wheel 62 are horizontally distributed inside the wire feeding box 6. The first wire feeding wheel 61 and the second wire feeding wheel 62 are rotatably mounted on the wire feeding box 6. The outer ring sidewall of the first wire feeding wheel 61 and the second wire feeding wheel 62 are both provided with a groove 611 with a V-shaped cross section, and the inner sidewall of the groove 611 is provided with a number of fixedly arranged strip-shaped protrusions 612.

[0043] Reference Figure 5 The side wall of the wire feeding box 6 is provided with a sliding groove 63 for the translation of the first wire feeding wheel 61. One sliding groove 63 is provided at each end of the shaft of the first wire feeding wheel 61, and a slider 631 is slidably disposed within each sliding groove 63. The shaft of the first wire feeding wheel 61 passes through the slider 631 and rotates in cooperation with it. A first elastic element 632 is provided within each sliding groove 63. In this embodiment, the first elastic element 632 is a spring, located on the side of the slider 631 facing away from the second wire feeding wheel 62, abutting against the inner end wall of the sliding groove 63 and the slider 631.

[0044] Reference Figure 4 and Figure 5When the diameter of the welding wire changes, the first wire feeding wheel 61 is compressed, thereby compressing the first elastic element 632 and changing the distance between the first wire feeding wheel 61 and the second wire feeding wheel 62, thus adjusting the clamping force on the welding wire. For example, when encountering a small-diameter welding wire, the first elastic element 632 extends, causing the first wire feeding wheel 61 to move closer to the second wire feeding wheel 62, increasing the clamping force; when encountering a large-diameter welding wire, the first elastic element 632 is compressed, causing the first wire feeding wheel 61 to move away from the second wire feeding wheel 62, reducing the clamping force. The wire feeding box 6 is equipped with a drive assembly 7. The welding wire passes through the space between the first wire feeding wheel 61 and the second wire feeding wheel 62. The drive assembly 7 drives the first wire feeding wheel 61 and the second wire feeding wheel 62 to rotate relative to each other, transmitting the welding wire to the welding gun 231 through friction.

[0045] Reference Figure 5 The drive assembly 7 includes a first synchronous pulley 71, a drive pulley 72, a stepper motor 73, a second synchronous pulley 74, and a synchronous belt 75. The first synchronous pulley 71 is fixedly sleeved on the end of the first wire feeding pulley 61 extending out of the wire feeding box 6, and the drive pulley 72 is fixedly sleeved on the end of the second wire feeding pulley 62. The stepper motor 73 is fixedly mounted on the side wall of the wire feeding box 6 and is coaxially fixedly connected to the drive pulley 72. The second synchronous pulley 74 is located on the side of the drive pulley 72 opposite to the first synchronous pulley 71 and is rotatably mounted on the outer side wall of the wire feeding box 6. The synchronous belt 75 engages with both the first synchronous pulley 71 and the second synchronous pulley 74.

[0046] Reference Figure 5 The wire feeding box 6 is also provided with a tensioning rod 8 and an adjusting member 9. The adjusting member 9 and the tensioning rod 8 are provided on both sides of the fixed block 641. A vertical guide groove 64 is provided on the wire feeding box 6 between the first synchronous wheel 71 and the driving wheel 72. The fixed block 641 is fixedly provided in the guide groove 64. The adjusting member 9 includes a tensioning block 91 and a second elastic member 92. The tensioning block 91 is slidably provided in the guide groove 64. In this embodiment, the second elastic member 92 is also a spring. The spring abuts against the tensioning block 91 and the fixed block 641. The tensioning rod 8 is fixedly provided on the tensioning block 91. The transmission wheel 81 is rotatably sleeved on the tensioning rod 8. The synchronous belt 75 is engaged and sleeved on the transmission wheel 81.

[0047] Reference Figure 5 When the timing belt 75 is slack, the second elastic element 92 recovers its elasticity and pushes the two tensioning blocks 91 to move in opposite directions along the guide groove 64, thereby tightening the timing belt 75 by the tensioning rod 8; when the timing belt 75 is too tight, the second elastic element 92 is compressed, and the two tensioning blocks 91 move relative to each other along the guide groove 64, so that the timing belt 75 is properly relaxed.

[0048] The implementation principle of the C-shaped steel submerged arc welding device in this application embodiment is as follows: This C-shaped steel submerged arc welding device, by setting an adjustable wire feeding structure, uses a first elastic element 632 to adjust the distance between the first wire feeding wheel 61 and the second wire feeding wheel 62, which can accommodate welding wires of different diameters, ensuring appropriate clamping force on the welding wire. This avoids problems such as unstable wire feeding, poor weld formation, and wire damage caused by improper clamping force, effectively improving welding quality. Simultaneously, the setting of the conveying roller 3 and the clamping element 4 facilitates the conveying and fixing of the workpiece to be welded, improving work efficiency and welding stability. The entire device has a reasonable structure, and the various components are closely coordinated, representing a significant improvement and enhancement compared to existing technologies.

[0049] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A C-shaped steel submerged arc welding device, comprising a base (1) and a truss (2) disposed on the base (1), wherein a mounting plate (23) is ellipsably disposed on the truss (2), and a welding torch (231) and a flux box (232) are mounted on the mounting plate (23). Two workpieces to be welded are placed butt-to-butt on the base (1), with the weld seam located directly below the welding torch (231), and the flux box (232) located in front of the welding torch (231). The device is characterized in that... A welding wire spool (24) is provided on the top of the truss (2). A wire feeding box (6) is provided on the mounting plate (23) between the welding torch (231) and the welding wire spool (24). A first wire feeding wheel (61) and a second wire feeding wheel (62) are horizontally distributed inside the wire feeding box (6). A sliding groove (63) for the first wire feeding wheel (61) to move is provided on the side wall of the wire feeding box (6). One sliding groove (63) is provided at each end of the shaft of the first wire feeding wheel (61), and a slider (631) is slidably arranged in each sliding groove (63). The first wire feeding wheel (61) A rotating shaft passes through a slider (631) and rotates in cooperation with it. Each groove (63) is provided with a first elastic element (632). The first elastic element (632) is located on the side of the slider (631) away from the second wire feeding wheel (62) and abuts against the inner end wall of the groove (63) and the slider (631). The wire feeding box (6) is provided with a driving assembly (7). The welding wire passes through the first wire feeding wheel (61) and the second wire feeding wheel (62). The driving assembly (7) drives the first wire feeding wheel (61) and the second wire feeding wheel (62) to rotate relative to each other, and the welding wire is transmitted to the welding gun (231) through friction.

2. The C-shaped steel submerged arc welding device according to claim 1, characterized in that, The drive assembly (7) includes a first synchronous wheel (71) sleeved on the end of the first wire feeding wheel (61), a drive wheel (72) sleeved on the end of the second wire feeding wheel (62), a stepper motor (73) coaxially connected to the drive wheel (72), a second synchronous wheel (74) meshing with the drive wheel (72), and a synchronous belt (75) meshing with the first synchronous wheel (71) and the second synchronous wheel (74). The second synchronous wheel (74) is located on the side of the drive wheel (72) away from the first synchronous wheel (71) and is rotatably mounted on the outer wall of the wire feeding box (6). The wire feeding box (6) is also provided with a tension rod (8). The synchronous belt (75) is wound around the tension rod (8). The wire feeding box (6) is provided with an adjusting member (9) for vertically adjusting the tension rod (8) to maintain the transmission engagement between the synchronous belt (75) and the first synchronous wheel (71) and the second synchronous wheel (74).

3. The C-shaped steel submerged arc welding device according to claim 2, characterized in that, The wire feeding box (6) has a vertical guide groove (64) between the first synchronous wheel (71) and the driving wheel (72). A fixing block (641) is provided in the guide groove (64). The adjusting member (9) includes a tensioning block (91) slidably disposed in the guide groove (64) and a second elastic member (92) abutting the tensioning block (91) and the fixing block (641). The tensioning rod (8) is disposed on the tensioning block (91). A set of the adjusting member (9) and the tensioning rod (8) are provided on both sides of the fixing block (641).

4. The C-shaped steel submerged arc welding device according to claim 2, characterized in that, The tensioning rod (8) is rotatably fitted with a transmission wheel (81), and the synchronous belt (75) is engaged and fitted on the transmission wheel (81).

5. The C-shaped steel submerged arc welding device according to claim 1, characterized in that, The outer ring sidewalls of the first wire feeding wheel (61) and the second wire feeding wheel (62) are both provided with a groove (611) with a V-shaped cross section, and the inner sidewalls of the groove (611) are provided with a number of strip-shaped protrusions (612).

6. The C-shaped steel submerged arc welding device according to claim 1, characterized in that, Multiple conveying rollers (3) are distributed on the base (1) along the length direction perpendicular to the truss (2). The axial direction of the conveying rollers (3) is parallel to the length direction of the truss (2). A support plate (31) is provided at the end of each conveying roller (3) on the base (1). The conveying roller (3) is rotatably connected between two support plates (31).

7. The C-shaped steel submerged arc welding device according to claim 6, characterized in that, A clamping member (4) is provided on the base (1) between two adjacent conveying rollers (3). The clamping member (4) includes a clamping seat (41) that is slidably disposed on the base (1) and a limiting roller (42) disposed on opposite sides of the two clamping seats (41). A bidirectional lead screw (5) is rotatably disposed on the base (1) parallel to the axial direction of the conveying rollers (3). The threaded sections of the clamping seat (41) correspond one-to-one with the threaded sections of the bidirectional lead screw (5), and the clamping seat (41) is sleeved on the threaded sections of the bidirectional lead screw (5) by threaded rotation. The rotating shaft of the limiting roller (42) is vertically disposed and rotatably connected to the side wall of the clamping seat (41).

8. The C-shaped steel submerged arc welding device according to claim 7, characterized in that, A fixed sleeve (11) is slidably disposed on one end of the bidirectional lead screw (5) on the base (1). An internal spline (111) is disposed inside the fixed sleeve (11). A drive block (51) is coaxially disposed on the end of the bidirectional lead screw (5) near the fixed sleeve (11). An external spline (511) is disposed on the outer ring of the drive block (51). When the fixed sleeve (11) slides to be fitted onto the drive block (51), the internal spline (111) and the external spline (511) are engaged.

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