U rib plate welding device for bridge

Abstract

The invention relates to the technical field of steel structure welding, and discloses a bridge U rib plate welding device which comprises a portal frame and a bearing plate arranged below the portal frame and further comprises a welding assembly arranged on the portal frame. The bearing assembly is arranged on the bearing plate; the clamping assemblies are arranged at the two ends of the U-shaped rib plate; the pressure assembly is tightly attached to the upper portion of the U-shaped rib plate and used for pressing the U-shaped rib plate and the bottom plate; the blocking assembly is arranged on the portal frame and used for blocking the pressure assembly; when the bearing plate penetrates through the portal frame in the direction perpendicular to the portal frame, the U-shaped rib plate is welded to the bottom plate through the welding assembly, and the multiple sets of pressure assemblies are sequentially blocked in front of a welding point through the blocking assembly. According to the U rib plate welding device for the bridge, the positioned welding procedure is reduced, welding is conducted while clamping is conducted, and material deformation and stress concentration caused by positioned welding are reduced; welding is carried out while clamping is carried out, the independent positioning welding procedure can be omitted, production steps are reduced, and therefore the production progress is accelerated.

Description

Technical Field

[0001] The invention relates to the technical field of steel structure welding, and in particular to a U-rib welding device for bridges. Background Art

[0002] The U-rib welding device for bridges is a special equipment specially used for welding U-ribs to bridge decks (or bottom plates), which is designed to improve welding efficiency, precision and welding quality. Due to the importance of U-rib welding in bridge structures, the welding device usually has the characteristics of automation and precise control to ensure stability and consistency during the welding process.

[0003] A bridge welding device and a bridge welding method are disclosed in the patent publication number CN107775207A. A bridge welding device includes a welding device and a fixed tool for fixing U-ribs. The welding device is used to weld U-ribs; the fixed tool includes a tool body, a rotating shaft, and a first driving device; one end of the rotating shaft passes through the tool body and is rotatably connected to the tool body, and the first driving device is connected to one end of the tool body, and the first driving device can drive the tool body to rotate around the rotating shaft. The fixed tool is used to fix the U-rib, and the fixed tool is rotated by the first driving device. There is a certain angle between the tool body and the ground. Therefore, the U-rib also has a certain angle with the ground, which is convenient for welding the U-rib, and then the welding device welds the U-rib.

[0004] The prior art has the following defects: The existing U-rib welding process usually includes several steps: clamping and positioning, positioning welding and full welding. Although this method is widely used in actual operations, it still has some disadvantages and challenges. The following are the main disadvantages of this process: Welding deformation: When performing positioning welding, local high temperature will cause the material to expand and contract, thereby producing welding deformation. Due to the structural characteristics of the U-rib and the bridge deck, problems such as U-rib warping and uneven plate surface may occur after positioning welding, affecting the quality of subsequent full welding. If positioning welding is performed at multiple positions, the cumulative effect of deformation may cause the size and shape of the overall structure to deviate from the design requirements, increasing the difficulty of subsequent correction.

[0005] Insufficient positioning weld strength: Positioning welds are usually only temporary fixes, with small welds and limited strength. If the positioning weld breaks during the full welding process due to heat input and operation, the relative position of the U rib and the bridge deck may change, affecting the welding quality.

[0006] Stress concentration: The positioning weld may become a stress concentration point, especially in the subsequent full welding process. Due to the existence of the heat-affected zone, cracks or fatigue damage are prone to occur near the positioning weld.

[0007] Low production efficiency, multiple clamping and adjustments: It is necessary to first clamp and position, then perform positioning welding, and finally perform full welding. Multiple clamping, positioning welding and full welding are required, with high equipment and labor costs and low production efficiency. After positioning welding is completed, it is usually necessary to wait for the weld to cool before subsequent full welding can be performed, which increases the production cycle. Summary of the invention

[0008] In view of the above problems in the prior art, a U-rib welding device and method for a bridge are proposed.

[0009] The present application provides a U-rib welding device for bridges, the purpose of which is to integrate positioning welding and full welding, weld while positioning and clamping the U-rib, reduce welding procedures, ensure weld quality, and save costs.

[0010] The technical solution of the present invention is: a U-rib welding device for bridges, comprising a gantry, a bearing plate arranged below the gantry, a driving assembly arranged at the bottom of the bearing plate for moving the bearing plate, and further comprising: A welding assembly, arranged on the gantry, for welding the U-rib plate; A bearing assembly, arranged on the bearing plate, for fixing the bottom plate; Clamping components are arranged at both ends of the U-rib plate and are used to position the U-rib plate; The pressure components are arranged in parallel in multiple groups and are closely arranged above the U-rib plate to press the U-rib plate and the bottom plate tightly; An arresting assembly, arranged on the gantry, for arresting the pressure assembly; When the bearing plate passes through the gantry in a direction perpendicular to the gantry, the welding assembly welds the U-rib plate to the bottom plate, and the blocking assembly blocks the multiple groups of pressure assemblies in sequence in front of the welding points.

[0011] By adopting the above scheme, the device can reduce the positioning welding process, and welding can be carried out while clamping, thereby reducing material deformation and stress concentration caused by positioning welding; by welding while clamping, the separate positioning welding process can be omitted, the production steps can be reduced, and the production progress can be accelerated; the automated equipment can reduce manual operation and the errors caused by transferring the plate, and improve the consistency and accuracy of welding.

[0012] Furthermore, the welding assembly includes a horizontal moving assembly arranged on the gantry, a vertical moving assembly arranged on the horizontal moving assembly, and a welding machine arranged on the vertical moving assembly.

[0013] By adopting the above scheme, the welding machine can be moved horizontally and vertically through the welding assembly, and the U-rib plate can be welded after being moved to a suitable position.

[0014] Furthermore, the bearing assembly includes multiple groups of lower support frames arranged on the bearing plate, multiple groups of upper support frames are respectively hinged to the multiple groups of lower support frames, the multiple groups of upper support frames are connected to a tire frame, multiple groups of reversed curved ribs are arranged on the upper surface of the tire frame, the bottom plate is tightly arranged on the reversed curved ribs, and multiple groups of hydraulic pressure claws are arranged on the left and right sides of the tire frame.

[0015] By adopting the above scheme, the base plate is fixed by the load-bearing component, and a certain angle is formed between the base plate and the ground. The position of the weld can be adjusted, and the welding gun can weld at a more suitable angle, thereby ensuring the quality of the weld; the tilting base plate can make the welding path smoother, reduce the adjustment and stop time of the equipment, and improve the welding speed and production efficiency; the tilting base plate can make the welding heat input more uniform, reduce local overheating and stress concentration, and thus reduce the risk of welding deformation.

[0016] Furthermore, the clamping assembly includes clamping blocks arranged on the front and rear sides of the tire frame, wherein the clamping block located on the front side is connected to the tire frame through a hydraulic push rod, and the clamping block includes a bottom block, an inner clamping block arranged at the end of the bottom block, and an outer clamping block arranged at the end of the bottom block, the shape of the inner clamping block is in contact with the inner contour of the U rib plate, the outer clamping block is symmetrically arranged at the bending part of the U rib plate and in contact with the outer contour of the U rib plate, the end of the U rib plate is clamped between the inner clamping block and the outer clamping block, and the number of the clamping blocks matches the number of the U rib plates.

[0017] By adopting the above solution, a clamping assembly is provided to clamp the two ends of the U-rib plate, so that a plurality of U-rib plates are positioned on the bottom plate.

[0018] Furthermore, the pressure assembly includes sliding rods symmetrically arranged on the left and right sides of the tire frame, multiple groups of pressure frames slidably arranged on a pair of sliding rods, and multiple groups of pressure claws arranged on the pressure frames, the pressure claws fit the outer contour of the U rib plate, and the pressure claws are provided with a pair of side rollers and a top roller, the side rollers are in extrusion contact with the side surfaces of the U rib plate, and the top roller is in extrusion contact with the top surface of the U rib plate, and the number of pressure claws on each group of the pressure frames matches the number of U rib plates.

[0019] By adopting the above scheme, by setting a pressure component, pressure is applied to multiple U-ribs at equal intervals, so that the edges of the U-ribs are in close contact with the bottom plate, thereby ensuring the consistency of the weld.

[0020] Furthermore, a sliding block is fixedly connected to the top of the pressure claw, and a sliding cavity for the sliding block to slide vertically is provided on the pressure frame. A spring is provided in the sliding cavity, and the spring is against the sliding block. An inclined groove is provided on the sliding block, and an extrusion hole is provided on the pressure frame at a position corresponding to the inclined groove, and the extrusion hole is connected to the sliding cavity. An extrusion rod is provided on the opposite surface of the pressure frame corresponding to the extrusion hole, and the extrusion rod matches the extrusion hole.

[0021] By adopting the above scheme, through the device, when multiple pressure racks are blocked, the blocked pressure claws are lifted, so as to avoid the blocked pressure claws exerting concentrated pressure on the U rib plate, causing stress concentration and deformation of the U rib plate.

[0022] Furthermore, the blocking assembly includes a blocking rod arranged on the gantry, and a blocking plate arranged on the blocking rod, wherein the blocking plate is arc-shaped and its center coincides with the rotation center of the load-bearing assembly, and further includes a blocking arm arranged on the rearmost pressure frame, and an abutment rod arranged on the blocking arm, wherein the abutment rod corresponds to the position of the blocking plate, a locking head is arranged at the end of the abutment rod, and an arc-shaped groove is arranged on the blocking plate, and the arc-shaped groove matches the locking head.

[0023] By adopting the above scheme, a blocking assembly is provided so that a plurality of pressure racks are blocked when they are moved to the front of the welding machine, and the welding of the U ribs is not affected while applying pressure to the U ribs for positioning.

[0024] Furthermore, steel cables are connected between the multiple groups of pressure frames.

[0025] By adopting the above solution, by setting the steel cable, when the load-bearing plate is reset, the blocking assembly pulls the multiple pressure frames so that the multiple pressure frames are redistributed equidistantly on the U-rib plate.

[0026] Beneficial effects of the present invention: This device reduces the tack welding process and allows welding to be performed while clamping, reducing material deformation and stress concentration caused by tack welding. By welding while clamping, the separate tack welding process can be omitted, reducing production steps and thus speeding up production progress. Automated equipment can reduce manual operations and errors caused by transferring plates, improving welding consistency and accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A three-dimensional diagram of a U-rib welding device for bridges according to the present invention; Figure 2 It is a front view of the U-rib welding device for bridges of the present invention; Figure 3 A three-dimensional diagram of a load-bearing component in a U-rib welding device for a bridge of the present invention; Figure 4 This is a rear view of a load-bearing component in the U-rib welding device for bridges of the present invention; Figure 5 For the present invention Figure 3 A three-dimensional view of the hidden bottom plate and U-rib plate; Figure 6 This is a connection diagram of the bottom plate and the U rib plate in the U rib plate welding device for bridges of the present invention; Figure 7A three-dimensional diagram of a pressure claw in a U-rib welding device for a bridge according to the present invention; Figure 8 It is a cross-sectional view in the left and right directions of the pressure claw in the U-rib welding device for bridges of the present invention; Fig. 9 It is a front-to-back cross-sectional view of the pressure claw in the U-rib welding device for bridges of the present invention; Fig.10 A three-dimensional diagram of a clamping block in a U-rib welding device for bridges of the present invention; Fig.11 It is an exploded view of the blocking assembly in the U-rib welding device for bridges of the present invention.

[0028] In the figure: 1. Gantry; 2. Load-bearing plate; 3. Welding assembly; 4. U-rib plate; 5. Load-bearing assembly; 6. Bottom plate; 7. Clamping assembly; 8. Pressure assembly; 9. Blocking assembly; 10. Horizontal moving assembly; 11. Vertical moving assembly; 12. Welding machine; 13. Lower support frame; 14. Upper support frame; 15. Tire frame; 16. Recurved rib; 17. Hydraulic pressure claw; 18. Clamping block; 19. Hydraulic push rod; 20 , bottom block; 21, inner clamping block; 22, outer clamping block; 23, sliding rod; 24, pressure frame; 25, pressure claw; 26, side roller; 27, top roller; 28, sliding block; 29, sliding cavity; 30, spring; 31, inclined groove; 32, extrusion hole; 33, extrusion rod; 34, blocking rod; 35, blocking plate; 36, blocking arm; 37, abutment rod; 38, engaging head; 39, arc groove; 40, steel cable. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0030] Example, see Figure 1-11 , is an embodiment of the present invention, providing a U-rib welding device for a bridge, comprising a gantry 1, a bearing plate 2 arranged below the gantry 1, a driving assembly arranged at the bottom of the bearing plate 2 for moving the bearing plate 2, and further comprising: a welding assembly 3 arranged on the gantry 1 for welding the U-rib 4; a bearing assembly 5 arranged on the bearing plate 2 for fixing the bottom plate 6; a clamping assembly 7 arranged at both ends of the U-rib 4 for positioning the U-rib 4; a pressure assembly 8, a plurality of groups of which are arranged in parallel and closely arranged above the U-rib 4 for pressing the U-rib 4 against the bottom plate 6; a blocking assembly 9 arranged on the gantry 1 for blocking the pressure assembly 8; when the bearing plate 2 passes through the gantry 1 in a direction perpendicular to the gantry 1, the welding assembly 3 welds the U-rib 4 to the bottom plate 6, and the blocking assembly 9 blocks the plurality of groups of pressure assemblies 8 in sequence in front of the welding point.

[0031] Specifically, during welding, the supporting plate 2 is fed toward the gantry 1 through the driving assembly, so that the bottom plate 6 and the U rib 4 that have been positioned and assembled pass through the welding assembly 3 to complete the welding; the supporting plate 2 can also be fixed to the ground, and the driving assembly can be set on the gantry 1, so that the gantry 1 carries the welding assembly 3 to feed toward the bottom plate 6 to complete the welding. When the welding bottom plate 6 is small, the bottom plate 6 can be selected to feed toward the welding assembly 3. When the welding bottom plate 6 is large, the welding assembly 3 can be selected to feed toward the bottom plate 6.

[0032] The device improves production efficiency. By welding while clamping, the separate positioning welding process can be omitted, the production steps can be reduced, and the production progress can be accelerated. There is no need to wait for the positioning welding to be completed and cooled. Full welding can be carried out directly after the clamping is completed, shortening the entire production cycle. Clamping and welding can achieve continuous operation, reduce the handling and turnover time of the workpiece, and improve the fluency of the production line. Through automated clamping and welding equipment, manual operation can be reduced, and the dependence on welder skills can be reduced, thereby reducing labor costs. Since clamping and welding can be carried out simultaneously, one operator can manage multiple devices, further reducing labor costs. Reduce deformation caused by positioning welding: positioning welding is usually only a temporary fixation, the welding point is small and the strength is limited, which is easy to cause local deformation. By performing full welding while clamping, the deformation problem caused by positioning welding can be avoided and the welding quality can be ensured. Reduce stress concentration: positioning welding points may become stress concentration points, especially in the subsequent full welding process. By directly performing full welding, the stress concentration problem caused by positioning welding points can be avoided, and the overall strength and reliability of the structure can be improved. More uniform welds: since multiple clamping and adjustments are not required, the welds can be more uniform and consistent, reducing welding defects.

[0033] Reference Figure 1 and Figure 2 The welding assembly 3 includes a horizontal moving assembly 10 arranged on the gantry 1, a vertical moving assembly 11 arranged on the horizontal moving assembly 10, and a welding machine 12 arranged on the vertical moving assembly 11.

[0034] Specifically, four groups of welding components 3 are arranged. The horizontal moving component 10 is used to adjust the horizontal positions of the plurality of welding machines 12. The vertical moving component 11 is used to adjust the vertical positions of the plurality of welding machines 12. The welding machine 12 is a laser welding machine 12. Laser welding has extremely high energy density and can achieve high-precision and high-quality welding. It is suitable for U-rib welding with thin walls and high strength requirements.

[0035] It is understandable that the number of welding assemblies 3 is not limited to the number in this embodiment, and the number of corresponding welding assemblies 3 can be selected according to the number of U-ribs 4 welded on the bottom plate 6 as required.

[0036] Through the welding assembly 3 , the welding head of the welding machine 12 can move horizontally and vertically. After moving to a suitable position, the U-rib plate 4 is welded through the feeding movement of the carrier plate 2 .

[0037] Reference Figure 1 , Figure 4 and Figure 5 The bearing assembly 5 includes multiple groups of lower support frames 13 arranged on the bearing plate 2, multiple groups of upper support frames 14 are hinged to the multiple groups of lower support frames 13, multiple groups of upper support frames 14 are connected to the tire frame 15, multiple groups of reversed ribs 16 are arranged on the upper surface of the tire frame 15, the bottom plate 6 is tightly arranged on the reversed ribs 16, and multiple groups of hydraulic pressure claws 17 are arranged on the left and right sides of the tire frame 15.

[0038] Specifically, multiple groups of upper support frames 14 are fixed on the lower surface of the tire frame 15, and multiple groups of hydraulic push rods are symmetrically arranged between the tire frame 15 and the load-bearing plate 2. Each group of hydraulic push rods can rotate the tire frame 15 by ±15° compared with the load-bearing plate 2. During welding, the tire frame 15 is first rotated by +15° compared with the load-bearing plate 2, and the load-bearing plate 2 is reset after the welding of one side of the U rib 4 is completed. Then, the tire frame 15 is rotated by -15° compared with the load-bearing plate 2 to complete the welding of the other side of the U rib 4.

[0039] By using the bearing assembly 5 to fix the bottom plate 6, a certain angle is formed between the bottom plate 6 and the ground, so that the position of the weld can be adjusted, and the welding gun can weld at a more suitable angle, thereby ensuring the quality of the weld; tilting the bottom plate 6 can make the welding path smoother, reduce the adjustment and pause time of the equipment, and improve the welding speed and production efficiency; tilting the bottom plate 6 can make the welding heat input more uniform, reduce local overheating and stress concentration, and thus reduce the risk of welding deformation.

[0040] Reference Figure 1 , Figure 3 and Fig.10 The clamping assembly 7 includes clamping blocks 18 arranged on the front and rear sides of the tire frame 15, wherein the clamping block 18 located on the front side is connected to the tire frame 15 through a hydraulic push rod 19, and the clamping block 18 includes a bottom block 20, an inner clamping block 21 arranged at the end of the bottom block 20, and an outer clamping block 22 arranged at the end of the bottom block 20. The shape of the inner clamping block 21 is in contact with the inner contour of the U rib 4, and the outer clamping block 22 is symmetrically arranged at the bending part of the U rib 4 and in contact with the outer contour of the U rib 4. The end of the U rib 4 is clamped between the inner clamping block 21 and the outer clamping block 22, and the number of the clamping blocks 18 matches the number of the U ribs 4.

[0041] Specifically, the bottom block 20 located at the front clamping block 18 is longer. The front clamping block 18 clamps the two ends of the U-rib rod in place through a hydraulic push rod 19. In addition to fixing the U-rib plate 4, the front clamping block 18 is also used to receive the blocked pressure frame 24. When welded to the end of the U-rib plate 4, multiple groups of pressure frames 24 are pushed onto the front clamping block 18.

[0042] By providing a clamping assembly 7 , the U-ribs 4 are clamped from both ends to position the plurality of U-ribs 4 on the bottom plate 6 .

[0043] Reference Figure 1 , Figure 3 and Figure 8 The pressure assembly 8 includes slide bars 23 symmetrically arranged on the left and right sides of the tire frame 15, multiple groups of pressure frames 24 slidably arranged on a pair of slide bars 23, and multiple groups of pressure claws 25 arranged on the pressure frames 24. The pressure claws 25 fit the outer contour of the U rib 4. A pair of side rollers 26 and a top roller 27 are arranged on the pressure claws 25. The side rollers 26 are in extrusion contact with the side surfaces of the U rib 4, and the top rollers 27 are in extrusion contact with the top surface of the U rib 4. The number of pressure claws 25 on each group of pressure frames 24 matches the number of U ribs 4.

[0044] Specifically, two groups of slide bars 23 are fixedly connected to the tire frame 15 through a support frame. There are slide holes at both ends of the pressure frame 24. The pressure frame 24 slides on the slide bars 23 through the slide holes. Multiple groups of pressure frames 24 are arranged in parallel. The top roller 27 and a pair of side rollers 26 squeeze the U rib 4 from three directions to make the U rib 4 close to the bottom plate 6. The top roller 27 and the side rollers 26 are made of rubber and are in squeeze contact with the U rib 4. After the pressure frame 24 is blocked, the top roller 27 and the side rollers 26 roll in contact with the U rib 4, and will not cause scratches on the surface of the U rib 4.

[0045] By setting the pressure assembly 8, pressure is applied to the plurality of U-ribs 4 at equal intervals, so that the edges of the U-ribs 4 are in close contact with the bottom plate 6, thereby ensuring the consistency of the weld.

[0046] Reference Figure 3 , Figure 5 , Figure 7-Figure 9 A sliding block 28 is fixedly connected to the top of the pressure claw 25, and a sliding cavity 29 for the sliding block 28 to slide vertically is provided on the pressure frame 24. A spring 30 is provided in the sliding cavity 29, and the spring 30 abuts against the sliding block 28. An inclined groove 31 is provided on the sliding block 28, and an extrusion hole 32 is provided on the pressure frame 24 at a position corresponding to the inclined groove 31. The extrusion hole 32 is connected to the sliding cavity 29, and an extrusion rod 33 is provided on the opposite surface of the pressure frame 24 corresponding to the extrusion hole 32, and the extrusion rod 33 matches the extrusion hole 32.

[0047] Specifically, the sliding block 28 is in the shape of "冂". The sliding block 28 slides within the sliding cavity 29. The spring 30 presses against the sliding block 28, causing the top roller 27 and the side roller 26 to press against the U-shaped rib plate 4, increasing the pressing force on the U-shaped rib plate 4. When two or more pressure frames 24 are blocked, the adjacent extrusion rods 33 penetrate into the extrusion holes 32. The extrusion rods 33 act on the inclined grooves 31, causing the sliding block 28 to lift. The top roller 27 and the side roller 26 lift accordingly, releasing the extrusion on the U-shaped rib plate 4.

[0048] With this device, when multiple pressure frames 24 are blocked, the blocked pressure claws 25 lift up, preventing the blocked pressure claws 25 from concentrating pressure on the U-shaped rib plate 4 and causing deformation due to stress concentration on the U-shaped rib plate 4.

[0049] Refer to Figure 1 and Fig.11 As shown in

[0050] Specifically, when the engaging head 38 is engaged in the arc-shaped groove 39, it can withstand a certain amount of pulling force. The engaging head 38 is engaged in the arc-shaped groove 39. After one-sided welding is completed and the bearing plate is reset, the engaging head 38 drives multiple pressure frames 24 to reset together.

[0051] By providing the blocking assembly 9, multiple pressure frames 24 are blocked when moving in front of the welding machine 12, positioning the U-shaped rib plate 4 while applying pressure without affecting the welding of the U-shaped rib plate 4.

[0052] Refer to Figure 3 As shown in

[0053] By providing the steel cable 40, when the bearing plate 2 is reset, the blocking assembly 9 pulls multiple pressure frames 24, causing multiple pressure frames 24 to be evenly distributed on the U-shaped rib plate 4 again.

[0054] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A U-rib welding device for a bridge, comprising a gantry (1), a bearing plate (2) arranged below the gantry (1), a driving assembly being arranged at the bottom of the bearing plate (2) for moving the bearing plate (2), characterized in that: Also includes, A welding assembly (3) is arranged on the gantry (1) and is used for welding the U-rib plate (4); A bearing assembly (5) disposed on the bearing plate (2) and used to fix the bottom plate (6); Clamping components (7) are arranged at both ends of the U-rib plate (4) and are used to position the U-rib plate (4); A plurality of pressure components (8) are arranged in parallel and are closely arranged above the U-rib plate (4) to press the U-rib plate (4) and the bottom plate (6) together; A blocking assembly (9) is arranged on the gantry (1) and is used to block the pressure assembly (8); When the bearing plate (2) passes through the gantry (1) in a direction perpendicular to the gantry (1), the welding assembly (3) welds the U rib plate (4) to the bottom plate (6), and the blocking assembly (9) blocks the multiple groups of pressure assemblies (8) in sequence in front of the welding point.

2. The U-rib welding device for bridge according to claim 1 is characterized in that: The welding assembly (3) comprises a horizontal moving assembly (10) arranged on a gantry (1), a vertical moving assembly (11) arranged on the horizontal moving assembly (10), and a welding machine (12) arranged on the vertical moving assembly (11).

3. The U-rib welding device for bridge according to claim 1, characterized in that: The bearing assembly (5) comprises a plurality of groups of lower support frames (13) arranged on the bearing plate (2), a plurality of groups of upper support frames (14) being hingedly connected to the plurality of groups of lower support frames (13), a tire frame (15) being connected to the plurality of groups of upper support frames (14), a plurality of groups of inversely curved ribs (16) being arranged on the upper surface of the tire frame (15), the bottom plate (6) being closely arranged on the inversely curved ribs (16), and a plurality of groups of hydraulic pressure claws (17) being arranged on both left and right sides of the tire frame (15).

4. The U-rib welding device for bridge according to claim 1, characterized in that: The clamping assembly (7) comprises clamping blocks (18) arranged at the front and rear sides of the tire frame (15), wherein the clamping block (18) located at the front side is connected to the tire frame (15) via a hydraulic push rod (19), and the clamping block (18) comprises a bottom block (20), an inner clamping block (21) arranged at the end of the bottom block (20), and an outer clamping block (22) arranged at the end of the bottom block (20), wherein the shape of the inner clamping block (21) is in contact with the inner contour of the U rib plate (4), and the outer clamping block (22) is symmetrically arranged at the bending position of the U rib plate (4) and in contact with the outer contour of the U rib plate (4), and the end of the U rib plate (4) is clamped between the inner clamping block (21) and the outer clamping block (22), and the number of the clamping blocks (18) matches the number of the U rib plates (4).

5. The U-rib welding device for bridge according to claim 1, characterized in that: The pressure assembly (8) comprises sliding rods (23) symmetrically arranged on the left and right sides of the tire frame (15), a plurality of groups of pressure frames (24) slidably arranged on a pair of sliding rods (23), and a plurality of groups of pressure claws (25) arranged on the pressure frames (24), wherein the pressure claws (25) fit the outer contour of the U-rib plate (4), and the pressure claws (25) are provided with a pair of side rollers (26) and a top roller (27), wherein the side rollers (26) are in compression contact with the side surfaces of the U-rib plate (4), and the top roller (27) is in compression contact with the top surface of the U-rib plate (4), and the number of pressure claws (25) on each group of the pressure frames (24) matches the number of the U-rib plates (4).

6. The U-rib welding device for bridge according to claim 5, characterized in that: The top of the pressure claw (25) is fixedly connected to a sliding block (28); the pressure frame (24) is provided with a sliding cavity (29) for the sliding block (28) to slide vertically; a spring (30) is provided in the sliding cavity (29); the spring (30) abuts against the sliding block (28); an inclined groove (31) is provided on the sliding block (28); an extrusion hole (32) is provided on the pressure frame (24) at a position corresponding to the inclined groove (31); the extrusion hole (32) is connected to the sliding cavity (29); an extrusion rod (33) is provided on the opposite surface of the pressure frame (24) corresponding to the extrusion hole (32); the extrusion rod (33) matches the extrusion hole (32).

7. The U-rib welding device for bridge according to claim 6, characterized in that: The blocking assembly (9) comprises a blocking rod (34) arranged on the gantry (1), and a blocking plate (35) arranged on the blocking rod (34), wherein the blocking plate (35) is arc-shaped, and its center coincides with the rotation center of the bearing assembly (5), and further comprises a blocking arm (36) arranged on the rearmost pressure frame (24), and an abutment rod (37) arranged on the blocking arm (36), wherein the abutment rod (37) corresponds to the position of the blocking plate (35), and a locking head (38) is arranged at the end of the abutment rod (37), and an arc-shaped groove (39) is arranged on the blocking plate (35), and the arc-shaped groove (39) matches the locking head (38).

8. The U-rib welding device for bridge according to claim 7, characterized in that: Steel cables (40) are connected between the multiple groups of pressure frames (24).

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