Positioning and fixing device for welding U-ribs to steel box girders

Abstract

This invention provides a positioning and fixing device for welding U-ribs to steel box girders. [Solution] The device includes a workbench and fixing equipment, the fixing equipment including a mounting holder attached to the workbench and positioned above the upper deck slab to position the U-rib by contacting the mounting holder, a positioning assembly attached to the workbench and used for positioning the upper deck slab, a position limiting mechanism used for positioning the U-rib, a guide rail attached to the mounting holder and corresponding to the U-rib, a plurality of clamping mechanisms connected to each other and sliding to be attached to the mounting holder or guide rail, and a welding assembly slidably positioned on the mounting holder or guide rail. The device positions the U-rib and corrects any deformations before welding through the clamping mechanism, and at the same time, the clamping mechanism continues to position and correct the U-rib after welding, thereby significantly reducing the probability of U-rib deformation and simultaneously improving welding efficiency and quality.

Description

Technical Field

[0001] The present invention relates to the technical field of steel box girders, and particularly to a positioning and fixing device for welding of U ribs of steel box girders.

Background Art

[0002] The floor slab structure of the steel box girder currently adopted in bridges includes a floor slab assembly, and the floor slab assembly includes vertical ribs and steel plates. When manufacturing the floor slab assembly, it is necessary to weld the webs and steel plates on both sides of the vertical ribs along the longitudinal fillets. Generally, slender and narrow U ribs (U-shaped ribs) are used for the vertical ribs.

[0003] As disclosed in the Chinese patent with application number 202120428711.4, a welding table holder for preventing welding deformation of a steel box girder, which includes a table holder, a lifting platform, and a robot arm. The steel plate and U rib are fixed to the table holder through the robot arm. During welding, the lifting platform moves up and down to pre-arch the steel plate, and after welding is completed, the reverse arch deformation of the steel plate is restored by the lowering of the lifting platform.

[0004] This device eliminates vertical welding deformation by forming an assembly stand with the reverse arch of the table holder during use. However, due to the long length of the U rib, the U rib is likely to bend and deform in the longitudinal direction during welding, reducing the welding quality. For example, if a clamping mechanism is arranged to reduce U rib deformation, the clamping mechanism is likely to interfere during welding and interfere with normal welding operations, thereby reducing the welding efficiency. Therefore, both welding quality and efficiency cannot be obtained.

Summary of the Invention

Means for Solving the Problems

[0005] In order to improve welding quality and efficiency simultaneously, the present application provides a positioning and fixing device for welding of U ribs of steel box girders.

[0006] The present invention provides a positioning and fixing device for welding of U ribs of steel box girders and adopts the following technical solutions: A positioning and fixing device for welding U-ribs to a steel box girder, comprising a workbench for placing the upper deck slab, and fixing equipment positioned on the workbench, wherein the fixing equipment is A mounting holder that is attached to the workbench and positioned above the upper floor plate, which positions the U-rib by contacting it with the mounting holder, A positioning assembly that is attached to a workbench and used for positioning the upper floor slab, A position limiting mechanism used for positioning U-ribs, A guide rail is attached to the mounting holder and is positioned above the U-rib in accordance with the U-rib, Multiple clamping mechanisms are connected head-to-tail, connected to each other and sliding to be mounted on a mounting holder or guide rail, and when the multiple clamping mechanisms are slidably positioned on the guide rail, the clamping mechanisms clamp onto the U-rib and are positioned, and when the welding of the U-rib is completed, all of the multiple clamping mechanisms are moved to the mounting holder. The welding assembly includes a mounting holder or guide rail that is slidably positioned between two clamping mechanisms and is driven by the clamping mechanisms to move and is used for welding U-ribs and upper deck plates.

[0007] By adopting the above configuration, the upper deck slab is placed on a workbench and positioned by a positioning assembly, the U-rib is placed on the upper deck slab and positioned by bringing both ends into contact with the mounting holders, and the position of the U-rib is restricted by a position limiting mechanism, then the clamping mechanism moves, the clamping mechanism moves from the mounting holders onto the guide rails, and when the clamping mechanism moves onto the guide rails, the clamping mechanism comes into contact with the U-rib, the guide rails guide and position the clamping mechanism, the clamping mechanism is positioned relative to the U-rib and corrects the deformed area, the movement of the clamping mechanism pulls the movement of the welding assembly, then the welding assembly begins welding the contact area between the U-rib and the upper deck slab, after welding is completed the multiple clamping mechanisms and welding assembly move and remain on the mounting holders, then the position limiting mechanism is released, and then the upper deck slab and U-rib can be removed.

[0008] A clamping mechanism located in front of the welding assembly positions the U-rib before welding and corrects any deformations. A clamping mechanism located behind the welding assembly continues to position and correct the U-rib after welding. Simultaneously, because the movement speed during welding is slow, the clamping mechanism can better position and correct the U-rib, significantly reducing the probability of U-rib deformation. At the same time, the clamping mechanism used for positioning and correcting moves along with the welding assembly, thus achieving positioning while reducing interference with the welding assembly. Furthermore, the clamping mechanism moves simultaneously with the welding assembly, significantly improving processing efficiency, saving energy, and enhancing welding efficiency and quality.

[0009] Preferably, the position limiting mechanism is The mounting holder includes a position limiting plate and a sliding plate, wherein the position limiting plate is positioned at one end of the mounting holder, and the sliding plate is positioned at the other end of the mounting holder along the direction in which the U-rib approaches or moves away from it, and the position limiting plate and the sliding plate are positioned by contacting the opposing side walls of the U-rib. The system includes an elastic stretch assembly, the elastic stretch assembly being positioned on a workbench and in contact with one end of the U-rib away from the mounting holder by elastic force, the U-rib being positioned in contact with both ends of the mounting holder, the elastic stretch assembly being positioned away from the U-rib after the clamping mechanism moves, and the elastic stretch assembly being released after the operator replaces the U-rib.

[0010] By adopting the above configuration, the U-rib is placed on the upper deck plate, the U-rib is brought into contact with both ends of the mounting holder and the position limiting plate, and then the position limiting plate and the sliding plate are brought into contact with the opposing side walls of one end of the U-rib to position it. The sliding plate is then brought closer to the U-rib, and then the elastic expansion and contraction assembly is released and brought into contact with the U-rib, and finally both ends of the U-rib are brought into contact with the mounting holder to position it. In this way, the clamping mechanism positions the U-rib when it clamps it, reducing the probability of the U-rib moving due to the clamping mechanism and improving welding quality.

[0011] Simultaneously, after the clamping mechanism contacts the elastic stretch assembly, it separates the elastic stretch assembly from the U-rib and finally positions the elastic stretch assembly. When the clamping mechanism and the elastic stretch assembly separate, the elastic stretch assembly also maintains its distance from the U-rib, and thus maintains its distance from the welding assembly. This achieves positioning while simultaneously reducing interference of the welding assembly to the welding, improving convenience during welding and simultaneously improving welding quality and efficiency. Furthermore, after replacing the U-rib, the operator releases the elastic stretch assembly, and the elastic stretch assembly is positioned in contact with the U-rib.

[0012] Preferably, the elastic stretch assembly is A fixing rod positioned on a workbench and having a positioning hole, A movable plate is positioned to slide along a fixed rod in the direction in which the U-rib approaches or moves away from it, A first elastic member, whose ends are connected to a movable plate and a fixed rod respectively, and which positions the movable plate by bringing it into contact with the U-rib through elastic force, A positioning member is positioned to slide on the movable plate and whose sliding direction is perpendicular to the sliding direction of the movable plate, It includes a second elastic member which is positioned on the positioning member and connected to a movable plate to bring the positioning member closer to the positioning hole, The clamping mechanism moves the movable plate away from the U-rib and brings it closer to the positioning hole, and inserts the positioning member into the positioning hole through the second elastic member to position it.

[0013] By adopting the above configuration, the movable plate is brought into contact with the U-rib through the first elastic member to perform positioning. After contacting the movable plate, the clamping mechanism moves the movable plate away from the U-rib and approaches the positioning hole under the pressure of the second elastic member until the movable plate is inserted into the positioning hole and positioned. At this time, a distance is maintained between the movable plate and the U-rib, allowing the clamping mechanism and the welding assembly to move, thereby achieving positioning while simultaneously reducing interference of the welding assembly with the welding.

[0014] On the other hand, after replacing the U-rib with a new one and placing it on the upper deck slab, the U-rib is brought into contact with the position limiting plate and mounting holder, the sliding plate is brought into contact with the U-rib for positioning, the positioning member is released from the positioning hole, and the moving plate is brought into contact with the U-rib under the action of the first elastic member for positioning, thereby allowing the welding work to continue, significantly improving the positioning effect and convenience during positioning, and simultaneously improving welding quality and efficiency.

[0015] Preferably, the movable plate is provided with a guide plate that guides the clamping mechanism when the movable plate is pressed, and a guide wheel that contacts the clamping mechanism is rotatably provided on the movable plate.

[0016] By adopting the above configuration, the guide plate and guide wheel can guide the clamping mechanism when it comes into contact with the moving plate, while simultaneously reducing wear caused by contact between the two.

[0017] Preferably, the clamping mechanism is It includes a clamping holder and a plurality of first roller bodies, Multiple first roller bodies are rotatably mounted on the clamping holder and are positioned by contacting the opposing side walls of the mounting holder or guide rail, so that the clamping holder slides on the mounting holder or guide rail, and as the multiple first roller bodies move along the guide rail they come into contact with the guide rail and the U-rib, positioning the U-rib under the guidance of the guide rail and correcting any deformed areas. Including a second roller body, The second roller body is rotatably mounted on the clamping holder and is positioned by contacting the upper part of the mounting holder or guide rail. Two adjacent clamping holders are connected to each other via a connecting assembly, which is straightened during welding to enable simultaneous movement of multiple clamping holders, and is connected so that the multiple clamping holders come into contact with each other after welding is complete. Two of the clamping holders located at the head and tail are each equipped with a drive assembly for rotating a first roller body to enable movement of the clamping holder.

[0018] By adopting the above configuration, the drive assembly located in the first clamping holder is activated to rotate a plurality of first roller bodies. The first roller bodies rotate to move the clamping holder, move the clamping holder onto the guide rail, and make the plurality of first roller bodies abut against the opposing side walls of both the guide rail and the U-rib. The guide rail guides and positions, thereby realizing the positioning and correction of the U-rib. The movement of the clamping holder moves the rear clamping holder through the connection assembly. The movement of the clamping holder rotates a plurality of first roller bodies, thereby realizing the movement of a plurality of clamping holders to position and correct the U-shaped rib. The movement of the clamping holder also pulls the movement of the welding assembly to perform welding.

[0019] When welding is completed, after the first clamping holder moves to the mounting holder, it stops. Finally, the drive assembly on the last-positioned clamping holder is activated, and the movement of the last-positioned clamping holder moves the front clamping holder. The plurality of clamping holders are moved until all the clamping holders move to and are arranged on the mounting holder. Since the two drive assemblies are used to position all the clamping holders, the positioning and correction of the U-rib can be performed at intervals of multiple times, achieving the force balance of the U-rib. Also, since the space occupied when arranging the plurality of clamping holders is reduced, the space occupied by the mounting holder is reduced. Moreover, due to the time taken for the movement of the clamping holder in the mounting holder, the welding quality and efficiency are further improved.

[0020] Preferably, the connection assembly includes two connecting threaded rods that are screwed to two clamping holders and covered with connection rings, and a connecting rope whose both ends are arranged on two connection rings.

[0021] By adopting the above configuration, when the clamping holder located in the front pulls the connecting rope, a plurality of clamping holders move together, and the clamping holder located in the rear moves while abutting against the clamping holder located in the front. By screwing the connecting screw rod away from the connecting ring, the connecting rope and the connecting ring can be removed and replaced. When installing, cover the connecting ring on the connecting screw rod, screw the connecting screw rod and make it abut against the clamping holder, whereby the connecting rope can be replaced.

[0022] Preferably, the drive assembly includes a drive motor arranged on the clamping holder, two sub-gear wheels arranged on the first roller bodies on both sides of the mounting holder respectively, and a main gear wheel arranged on the drive motor and meshing with the plurality of sub-gear wheels.

[0023] By adopting the above configuration, when the drive motor is activated to rotate the main gear wheel, the main gear wheel rotates the two sub-gear wheels, thereby rotating the two first roller bodies. The rotation of the first roller bodies positions the U-rib under the action of the guide rail and corrects the deformed part.

[0024] Preferably, the welding assembly includes a welding holder slidably arranged on the U-rib through two welding rollers, the two welding rollers are rotatably attached to the welding holder and abutted against the opposite side walls of the U-rib for positioning. The welding holder and the clamping holder are connected through a connection assembly and are driven by the clamping holder to move, and a welding torch arranged on the welding holder for welding the U-rib and the upper floor plate.

[0025] By adopting the above configuration, the movement of the clamping holder moves the welding holder. At the same time, the welding holder converts the direction and angle through the two welding rollers, adapts the position and angle of the welding torch and the U-rib. The welding torch starts welding, thereby realizing welding and improving the welding quality at the same time.

[0026] Preferably, the positioning assembly is It includes a first positioning plate and a second positioning plate, The first positioning plate and the second positioning plate are placed on the workbench and are positioned by contacting adjacent side walls of the upper floor slab. [Effects of the Invention]

[0027] As described above, this application includes at least one beneficial technical effect, A clamping mechanism located in front of the welding assembly positions the U-rib before welding and corrects any deformation, while a clamping mechanism located behind the welding assembly positions and continues to correct the U-rib after welding. Furthermore, because the movement speed during welding is slow and the clamping mechanism can better position and correct the U-rib, the probability of U-rib deformation is greatly reduced. As the clamping mechanism used for positioning and correcting moves with the movement of the welding assembly, positioning is achieved while reducing interference with the welding assembly. In addition, the clamping mechanism moves simultaneously with the welding assembly, greatly improving processing efficiency, saving energy, and enhancing welding efficiency and quality. [Brief explanation of the drawing]

[0028] [Figure 1] This is a perspective view of the fixing device. [Figure 2] This is a schematic diagram of the position limiting mechanism in a fixed device. [Figure 3] This diagram shows a schematic structure of the elastic expansion and contraction assembly in the fixing device, in which it is separated from the U-rib, and simultaneously shows cross-sectional views of the side walls of the fixing rod and the moving rod. [Figure 4] This is a schematic diagram of the structure of the mounting holder and clamping mechanism in the fixing device. [Figure 5] This is a schematic diagram of the structure of a welded assembly in a fixing device. [Modes for carrying out the invention]

[0029] The present invention will be described in more detail below with reference to the attached drawings, specifically regarding points 1 to 5.

[0030] The present invention discloses a positioning and fixing device for welding U-ribs to a steel box girder.

[0031] Refer to Figure 1, a positioning and fixing device for welding U-ribs of a steel box girder, comprising a workbench 1 for placing the upper deck slab 14, and fixing equipment 2 positioned on the workbench 1, the fixing equipment 2 for placing the U-ribs 13, positioning the U-ribs 13, and welding them.

[0032] Both the upper deck slab 14 and the upper surface of the machine frame 1 are horizontal, the upper deck slab 14 has a rectangular or square structure, and when the upper deck slab 14 is placed on the machine frame 1 it is horizontal, and at the same time the strength and thickness of the machine frame 1 meet the desired requirements, thereby reducing the probability of vertical deformation during welding of the upper deck slab 14.

[0033] Refer to Figures 1 and 2. The fixing device 2 includes a mounting holder 21 and a positioning assembly 22. A first rod and a second rod 12 are fixedly mounted to the opposing side walls of the workbench 1, respectively, extending upward from the workbench 1. The first rod 11 and the second rod 12 are positioned opposite each other. The mounting holder 21 has a "U" shape when horizontal. The side wall of the mounting holder 21 that is away from the U-shaped opening is fixedly mounted to one end of the first rod 11 that is closer to the second rod 12. The mounting holder 21 is positioned above the upper floor slab 14 such that both ends of the mounting holder 21 are away from the first rod 11, and when the U-rib 13 is positioned on the upper floor slab 14, both ends abut against both ends of the mounting holder 21, respectively.

[0034] The positioning assembly 22 is placed on the workbench 1 and used to position the upper floor slab 14. The positioning assembly 22 is fixed at intervals on the upper surface of the workbench 1 and includes a first positioning plate 23 and a second positioning plate 24 that are in a vertical position. The first positioning plate 23 and the second positioning plate 24 are positioned in contact with the adjacent side walls of the upper floor slab 14. The upper floor slab 14 is placed on the upper surface of the workbench 1 and positioned in contact with the first positioning plate 23 and the second positioning plate 24.

[0035] The fixing device 2 includes a position limiting mechanism 3, a guide rail 25 and a plurality of clamping mechanisms 4, and a welding unit 8. The position limiting mechanism 3 is used to position the U-rib 13, the guide rail 25 is fitted to the U-rib 13 and has the same dimensions and shape, and the mounting holder 21 is the same width as the guide rail 25, both ends of the guide rail 25 are fixedly attached to both ends of the mounting holder 21 and are located above the U-rib 13, and the height of the tops of both the guide rail 25 and the mounting holder 21 are the same.

[0036] Multiple clamping mechanisms 4 are arranged to slide along the mounting holder 21 or guide rail 25, and before welding, the multiple clamping mechanisms 4 were fixed to the mounting holder 21. However, when the clamping mechanisms 4 slide along the guide rail 25, the clamping mechanisms 4 clamp and position the U-rib 13 with the guide rail 25 and correct any deformation, so the strength of the guide rail 25 is greater than the strength of the U-rib 13. The welding assembly 8 is mounted to slide along the mounting holder 21 or guide rail 25 and is positioned between two of the clamping mechanisms 4. The welding assembly 8 moves under the drive of the clamping mechanisms 4 and is used to weld the U-rib 13 to the upper deck 14.

[0037] Refer to Figures 1 to 3. The position limiting mechanism 3 includes a position limiting plate 31, a sliding plate 32, and an elastic expansion and contraction assembly. The position limiting plate 31 is positioned at one end of the mounting holder 21, and the sliding plate 32 is positioned on the side wall at the other end of the mounting holder 21. The position limiting plate 31 and the sliding plate 32 are simultaneously attached to the opposing side walls of the mounting holder 21. The sliding direction of the sliding plate 32 is parallel to the longitudinal direction of the U-rib 13. The U-rib 13 is placed on the upper floor plate 14, and the U-rib 13 is brought into contact with the side wall of the position limiting plate 31 and both ends of the mounting holder 21. Then, the sliding plate 32 is brought into contact with the U-rib 13 to position one end of the U-rib 13.

[0038] The elastic expandable assembly 33 is provided on the second rod and is in contact with one end of the U-rib 13 away from the mounting holder 21 by elastic force. The U-rib 13 is positioned in contact with both ends of the mounting holder 21. When the clamping mechanism 4 moves, the elastic expandable assembly 33 is positioned to move away from the U-rib 13. When the operator replaces the U-rib 13, the elastic expandable assembly 33 is released and the elastic expandable assembly 33 continues to be positioned in contact with the U-rib 13.

[0039] The elastic expansion and contraction assembly 33 includes a fixing rod 34, a movable plate 35, a first elastic member 36, a positioning member 37, and a second elastic member 38. The fixing rod is fixedly attached to the second rod body 12 at one end near the first rod body 11 and is located above the upper floor plate 14. At the same time, the longitudinal direction of the fixing rod 34 is parallel to the longitudinal direction of the U-rib 13, and the fixing groove 34 is located at the end of the fixing rod 34 at the end near the U-rib 13 in the longitudinal direction. A hole 1 is provided, and a positioning hole 342 is provided on the upper surface of the fixing rod 34 that is perpendicular to the fixing groove 341 and communicates with the fixing groove 341. The movable plate 35 is attached to the fixing groove 341 by sliding via the movable rod 351, and the movable rod 351 is fixed to the movable plate 35 and to one side wall of the first rod body 11 so that the movable plate 35 moves closer to or further away from the U rib 13, and the movable plate 35 is arc-shaped and bonded to the side wall of the U rib 13.

[0040] Refer to Figures 2 and 3. A moving groove is provided on the upper surface of the moving rod 351, and the positioning member 37 is mounted to slide longitudinally in the moving groove, with the sliding direction perpendicular to the direction of movement of the moving rod 351. The first elastic member 36 and the second elastic member 38 are both springs. The first elastic member 36 is fitted onto the moving rod 351, with both ends in contact with the fixed rod 34 and the moving plate 35. The first elastic member 36 positions the moving plate 35 by bringing it closer to the U-rib 13 and one end away from the mounting holder 21. The second elastic member 38 is fixedly mounted to the bottom of the positioning member 37 and in contact with the bottom of the groove of the moving groove. The second elastic member 38 brings the positioning member 37 upward towards the fixed rod 34 and the positioning hole 342.

[0041] The movable plate 35 is positioned by contacting the U-rib 13 due to the elastic force of the first elastic member 36. After the clamping mechanism 4 moves to the movable plate 35, it moves the movable plate 35 away from the U-rib 13 and moves the movable plate 35 to bring the movable rod 351 and the positioning member 37 closer to the positioning hole 342 by the movement of the movable plate 35 until the positioning member 37 aligns with the positioning hole 342. The positioning member 37 is then inserted into the positioning hole 342 by the second elastic member 38, thereby creating a clearance space between the movable plate 35 and the U-rib 13, allowing the clamping mechanism 4 and the welded assembly 8 to pass through.

[0042] Guide plates 352 are fixedly attached to both ends of the movable plate 35. One end of the guide plate 352 that is away from the movable plate 35 is positioned away from the U-rib 13, and a guide plate is rotatably attached perpendicularly to one side wall of the guide plate 352. When the clamping mechanism 4 approaches, the guide plate 352 comes into contact with the guide plate to reduce wear caused by the clamping mechanism 4, and then the clamping mechanism 4 moves the movable plate 35 away, so the guide plate 352 guides the clamping mechanism 4 as it moves the movable plate 35.

[0043] Referring to Figures 1 and 4, the state of the clamping mechanism 4 is the same when it is located in two places, either on the clamping holder 41 or the guide rail 25. Therefore, the following will describe an example where the clamping mechanism 4 is located on the mounting holder 21. The clamping mechanism 4 includes the clamping holder 41, a plurality of first roller bodies 42, and a second roller body 43. The clamping holder 41 has a door-shaped cross-section and covers the mounting holder 21. The number of first roller bodies 42 is even and they are located on both sides of the mounting holder 21, facing each other. The first roller bodies 42 are rotatably mounted on the inner wall of the clamping holder 41 and are in a vertical position. The plurality of first roller bodies 42 located on both sides of the mounting holder 21 each abut against the opposing side walls of the mounting holder 21, and the rotation of the plurality of first roller bodies 42 moves the clamping holder 41.

[0044] The second roller body 43 is rotatably mounted on the inner wall of the clamping holder 41 and is in a horizontal position, and the second roller body 43 rolls onto the top of the mounting holder 21 by gravity. Two adjacent clamping holders 41 are connected by a connecting assembly 6, and multiple clamping holders 41 are connected at the front and rear, with drive assemblies 7 positioned in both the front and rear clamping holders 41 to move and rotate the first roller body 42. The welding assembly 8 is located between two adjacent clamping holders 41 and is interconnected with the clamping holder 41 located in front via the connecting assembly 6. When a clamping holder 41 moves, the connecting assembly 6 is first stretched to move the welding assembly 8, and then after the clamping holder 41 has been moved for a certain period of time, the connecting assembly 6 connected to the rear clamping holder 41 is stretched to move multiple clamping holders 41 simultaneously.

[0045] Refer to Figures 1 and 4. During welding, the drive unit 7 located on the first clamping holder 41 rotates two first roller bodies 42 to move the clamping holder 41, thereby rotating the other first roller body 42 and the second roller body 43. After the first clamping holder 41 has moved for a certain period of time, the connecting assembly 6 is straightened, causing the one clamping holder 41 located behind to move together, and sequentially, multiple clamping holders 41 move together. The multiple first roller bodies 42 move from the mounting holder 21 to the guide rail 25 and the U-rib 13. The multiple first roller bodies 42 contact the guide rail 25 to provide positioning guidance, and the multiple first roller bodies 42 contact the U-rib 13 to position the U-rib 13 and correct any deformation of the U-rib 13. At the same time, one end of the clamping holder 41 moves the welding assembly 8 to perform welding, which reduces the probability of longitudinal deformation and movement of the U-rib 13 during welding.

[0046] Once welding is complete, the drive assembly 7 located on the first clamping holder 41 stops operating, and the drive assembly 7 located on the last clamping holder 41 starts the last clamping holder 41 and continues to move forward, so that the later clamping holders 41 move the earlier clamping holders 41 forward, stopping until all of the clamping holders 41 are moved onto the mounting holder 21, and at the same time the drive assemblies 7 located at the front and rear simultaneously position all of the clamping holders 41.

[0047] Refer to Figures 1 and 4. The connecting assembly 6 includes two connecting threaded rods 61 and a connecting rope 62. Clamping grooves are provided on the opposing side walls of the two clamping holders 41. The two connecting threaded rods 61 pass perpendicularly across the upper surface of the clamping holders 41 and are inserted into the clamping grooves, contacting the bottom of the clamping grooves for positioning. Connecting rings 63 are fitted over the connecting threaded rods 61, and the connecting rings 63 are located within the clamping grooves. Both ends of the connecting rope 62 are fixedly attached to the connecting rings 63. As a result, after the clamping holders 41 move, the connecting ropes 62 can be stretched to pull the rear clamping holder 41, allowing them to move together. Simultaneously, the rear clamping holder 41 can move and contact the front clamping holder 41.

[0048] The drive assembly 7 includes a drive motor 71, two sub-gears 72, and a main gear 73. The drive motor 71 is fixedly mounted on the upper surface of the clamping holder 41, with its output shaft oriented vertically. Two first roller bodies 42, located on either side of the mounting holder 21, extend vertically upward above the clamping holder 41. Two sub-gears 72 are coupled to the two first roller bodies 42, respectively, and are located above the clamping holder 41. The main gear 73 is coupled to the output shaft of the drive motor 71 and is located between the two sub-gears 72, meshing with them.

[0049] Referring to Figures 1 and 5, the welding assembly 8 includes a welding holder 81 and a welding torch 82, the welding holder 81 covering a mounting holder 21, the mounting holder 21 being positioned to extend into the welding holder 81, and welding rollers 83 rotatably mounted on the inner wall of the welding holder 81 and on both sides of the mounting holder 21, both welding rollers 83 positioned in a vertical position in contact with the side wall of the mounting holder 21. The welding torch 82 is fixedly mounted to the bottom of the welding holder 81 and is used to weld the upper deck 14 and the U-rib 13.

[0050] The operating principle of the embodiment of this application is as follows: The upper floor slab 14 is placed on the workbench 1, and the upper floor slab 14 is positioned by bringing it into contact with the first positioning plate 23 and the second positioning plate 24. Subsequently, the U-rib 13 is placed on the upper floor slab 14, and the U-rib 13 is brought into contact with the side wall of the position limiting plate 31 and both ends of the mounting seat 21. Then, the sliding plate 32 is moved to bring it into contact with the U-rib 13 to position one end of the U-rib 13. The positioning plate 37 is pushed out and released from the positioning hole 342, and the moving plate 35 is brought into contact with the U-rib 13 under the action of the elastic member 36 to position it.

[0051] The drive motor 71 located on the first clamping holder 41 moves the clamping holder 41, causing multiple first roller bodies 42 to rotate. The movement of the clamping holder 41 moves the multiple first roller bodies 42 onto the guide rail 25, and the first roller bodies 42 contact and position themselves on the U-rib 13, correcting the deformed area. The movement of the clamping holder 41 also moves the welding holder 81 and welding torch 82. When the welding torch 82 moves to the contact point between the U-rib 13 and the upper deck 14, the welding torch As welding begins, the clamping holder 41 moves to the guide plate 352, moving the guide plate 352 and the moving plate 35 away from the U-rib 13. The moving plate 35 then moves to insert the positioning member 37 into the positioning hole 342 and position it, creating clearance space between the moving plate 35 and the U-rib 13 for the subsequent clamping holder 41 and welding holder 81 to pass through. The first roller body 42, located in front of the welding torch 82, can then be used for positioning and straightening the U-rib 13. Meanwhile, the first roller body 42, located behind the welding torch 82, continues to position the U-rib 13, improving welding efficiency and quality.

[0052] Once welding is complete, the first clamping holder 41 moves onto the mounting holder 21, the drive motor 71 located on the first clamping holder 41 stops operating, and the drive motor 71 located on the last clamping holder 41 starts operating to move the clamping holder 41, the later clamping holder 41 moves the previous clamping holder 41 forward, so that all the clamping holders 41 are moved and positioned on the mounting holder 21. After the two drive motors 71 stop, all the clamping holders 41 are positioned, the sliding plate 32 is then separated from the U-rib 13, the upper floor plate 14 and the U-rib 13 can be removed, and finally the upper floor plate 14 can be replaced and the subsequent welding work can continue, improving welding efficiency and quality.

[0053] All of the above are preferred embodiments of the present application and do not limit the scope of protection thereunder; therefore, all equivalent modifications made based on the structure, shape, and principle of the present application should be included within the scope of protection. [Explanation of symbols]

[0054] 1. Workbench; 11. First rod; 12. Second rod; 13. U-rib; 14. Upper deck; 2. Fixing equipment; 21. Mounting holder; 22. Positioning assembly; 23. First positioning plate; 24. Second positioning plate; 25. Guide rail; 3. Position limiting mechanism; 31. Position limiting plate; 32. Sliding plate; 33. Elastic expansion assembly; 34. Fixing rod; 341. Fixing groove; 342. Positioning hole; 35. Moving plate; 351. Moving rod; 352. Guide 36. Plate; 37. First elastic member; 38. Positioning member; 4. Second elastic member; 4. Clamping mechanism; 41. Clamping holder; 42. First roller body; 43. Second roller body; 6. Connecting assembly; 61. Connecting threaded rod; 62. Connecting rope; 63. Connecting ring; 7. Drive assembly; 71. Drive motor; 72. Sub-gear; 73. Main gear; 8. Welding assembly; 81. Welding holder; 82. Welding torch; 83. Welding roller.

Claims

1. A positioning and fixing device for welding U-ribs to steel box girders, The structure includes a workbench (1) for placing the upper floor slab (14), and fixing equipment (2) positioned on the workbench (1), wherein the fixing equipment (2) is A mounting holder (21) is attached to the workbench (1) and is located above the upper floor plate (14) to position the U-rib (13) by bringing it into contact with the mounting holder (21), A positioning assembly (22) is attached to the workbench (1) and used for positioning the upper floor slab (14), A position limiting mechanism (3) used for positioning the U-rib (13), A guide rail (25) is attached to the mounting holder (21) and is positioned above the U-rib (13) in accordance with the U-rib (13), Multiple clamping mechanisms (4) are connected to each other and slide to be mounted on a mounting holder (21) or guide rail (25). When the multiple clamping mechanisms (4) slide along the guide rail (25) and are positioned, the clamping mechanisms (4) clamp onto the U-rib (13) to position them. Once the welding of the U-rib (13) is complete, all of the multiple clamping mechanisms (4) are moved to the mounting holder (21). A positioning and fixing device for welding U-ribs of a steel box girder, characterized by comprising: a welding assembly (8) which is slidably positioned on a mounting holder (21) or guide rail (25) and located between two clamping mechanisms (4), and which is driven by the clamping mechanisms (4) to move and used for welding U-ribs (13) and upper deck slabs (14).

2. The position limiting mechanism (3) is The mounting holder (21) includes a position limiting plate (31) and a sliding plate (32), wherein the position limiting plate (31) is positioned at one end of the mounting holder (21), and the sliding plate (32) is positioned at the other end of the mounting holder (31) along the direction in which the U-rib (13) approaches or moves away from it, and the position limiting plate (31) and the sliding plate (32) are positioned by contacting the opposing side walls of the U-rib (13). The positioning and fixing device for welding steel box girder U-ribs according to claim 1, comprising an elastic expansion and contraction assembly (33), wherein the elastic expansion and contraction assembly (33) is positioned on a workbench (1) and is in contact with one end of the U-rib (13) away from the mounting holder (21) by elastic force, the U-rib (13) is positioned in contact with both ends of the mounting holder (21), the elastic expansion and contraction assembly (33) is positioned away from the U-rib (13) after the clamping mechanism (4) moves, and the elastic expansion and contraction assembly (33) is released after the worker replaces the U-rib (13).

3. The elastic stretch assembly (33) is A fixing rod (34) is positioned on the workbench (1) and has a positioning hole (342) provided therein, A movable plate (35) is positioned to slide along the fixing rod (34) in the direction in which the U-rib (13) approaches or moves away, A first elastic member (36) is connected at both ends to a movable plate (35) and a fixed rod (34), respectively, and is positioned by elastic force by bringing the movable plate (35) into contact with the U-rib (13), A positioning member (37) is positioned to slide on the movable plate (35) and whose sliding direction is perpendicular to the sliding direction of the movable plate (35), It includes a second elastic member (38) which is positioned on the positioning member (37) and connected to the movable plate (35) to bring the positioning member (37) closer to the positioning hole (342), The clamping mechanism (34) moves the movable plate (35) away from the U-rib (13) and brings it closer to the positioning hole (342), and positions the positioning member (37) by inserting it into the positioning hole (342) through the second elastic member (37), as described in claim 2, for positioning and fixing the steel box girder U-rib welding process.

4. The positioning and fixing device for welding U-ribs of a steel box girder according to claim 3, characterized in that a guide plate (352) is provided on the movable plate (35) to guide the clamping mechanism (4) when the movable plate (35) is pressed, and a guide wheel that contacts the clamping mechanism (4) is rotatably provided on the movable plate (352).

5. The clamping mechanism (4) is It includes a clamping holder (41) and a plurality of first roller bodies (42), Multiple first roller bodies (42) are rotatably mounted on the clamping holder (41) and are positioned by contacting the opposing side walls of the mounting holder (21) or the guide rail (25), so that the clamping holder (41) slides and is mounted on the mounting holder (21) or the guide rail (25), and as the multiple first roller bodies (42) move along the guide rail (25), they come into contact with the guide rail (25) and the U-rib (13), positioning the U-rib (13) under the guidance of the guide rail (25) and correcting any deformed areas. A second roller body (43) and, The second roller body (43) is rotatably mounted on the clamping holder (41) and is positioned by contacting the upper part of the mounting holder (21) or the guide rail (25). The positioning and fixing device for welding U-ribs of a steel box girder according to claim 1, characterized in that two adjacent clamping holders (41) are connected to each other via a connecting assembly (6), the connecting assembly (6) is straightened during welding to enable simultaneous movement of multiple clamping holders (41), and after welding is completed the multiple clamping holders (41) are connected so that they come into contact with each other, and two of the clamping holders (41) located at the neck and tail are each provided with a drive assembly (7) for rotating a first roller body (42) to enable movement of the clamping holders (41).

6. The aforementioned connection assembly (6) Two connecting threaded rods (61) are screw-connected to two clamping holders (41) and covered with connecting rings (63), The positioning and fixing device for welding U-ribs of a steel box girder according to claim 5, further comprising a connecting rope (62) whose ends are arranged in two connecting rings (63).

7. The drive assembly (7) is A drive motor (71) is positioned in the clamping holder (41), Two sub-gears (72) are positioned on the first roller bodies (42) on both sides of the mounting holder (21), The positioning and fixing device for welding steel box girder U-ribs according to claim 5, further comprising a main gear (73) arranged on a drive motor (71) and meshing with a plurality of sub-gears (72).

8. The welding assembly (8) is A welding holder (81) is positioned to slide on the U-rib (13) via two welding rollers (83), The two welding rollers (83) are rotatably mounted on the welding holder (81) and are positioned in contact with the opposing side walls of the U-rib (13), the welding holder (81) and the clamping holder (41) are connected via a connecting assembly (6), and the clamping holder (41) drives the welding rollers (83) to move. The positioning and fixing device for welding steel box girder U-ribs according to claim 5, further comprising a welding torch (82) positioned on a welding holder (81) and used for welding U-ribs (13) and upper deck slabs (14).

9. The positioning assembly (22) is It includes a first positioning plate (23) and a second positioning plate (24), The positioning and fixing device for welding steel box girder U-ribs according to claim 1, characterized in that the first positioning plate (23) and the second positioning plate (24) are arranged on the workbench (1) and are positioned by contacting adjacent side walls of the upper deck (14).

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