Positioning and fixing device for steel box girder U-rib welding

Abstract

We provide a positioning and fixing device for steel box girder U-rib welding processing. [Solution] The device includes a workbench and a fixing device, the fixing device including a mounting holder attached to the workbench and positioned above the upper deck slab for abutting the U-rib against the mounting holder to position it, a positioning assembly attached to the workbench and used to position the upper deck slab, a position limiting mechanism used to position 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 slidingly attached to the mounting holder or the guide rail, and a welding assembly slidably disposed on the mounting holder or the guide rail. The device uses the clamping mechanism to position the U-rib and correct any deformed portions before welding, and 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 more particularly to a positioning and fixing device for steel box girder U-rib welding processing. [Background technology]

[0002] The steel box girder deck structure currently used in bridges includes a deck assembly, which includes longitudinal ribs and steel plates. When manufacturing the deck assembly, it is necessary to weld the webs on both sides of the longitudinal rib to the steel plate along the longitudinal fillets. The longitudinal ribs are generally long and narrow U-shaped ribs.

[0003] As disclosed in the Chinese patent with application number 202120428711.4, a welding table holder for preventing welding deformation of steel box girders includes a table holder, a lifting platform, and a robot arm, and the steel plate and U-rib are fixed to the table holder through the robot arm. During welding, the lifting platform rises and falls to pre-reverse-arch the steel plate, and after welding is completed, the lifting platform descends to restore the reverse-arch deformation of the steel plate.

[0004] This device eliminates vertical welding deformation by forming an assembly stand using the inverted arch of the base holder during use, but because the U-rib is long, it is prone to bending and deformation in the longitudinal direction during welding, reducing weld quality.For example, if a clamping mechanism is installed to reduce U-rib deformation, the clamping mechanism is likely to interfere with normal welding operations during welding, reducing welding efficiency, making it impossible to achieve both high welding quality and efficiency. Summary of the Invention [Means for solving the problem]

[0005] In order to improve welding quality and efficiency at the same time, the present application provides a positioning and fixing device for steel box girder U-rib welding.

[0006] The present invention provides a positioning and fixing device for steel box girder U-rib welding, which adopts the following technical solutions: A positioning and fixing device for steel box girder U-rib welding processing, comprising a workbench for placing an upper deck slab, and a fixing device arranged on the workbench, an attachment holder attached to the workbench and positioned above the upper floor slab to position the U-rib by abutting it against the attachment holder; a positioning assembly attached to the work platform and used to position the upper deck; a position limiting mechanism used to position the U-rib; a guide rail attached to the mounting holder and positioned above the U-rib in correspondence with the U-rib; A plurality of clamping mechanisms are connected to each other, slidably connected to each other, and attached to an attachment holder or a guide rail; when the plurality of clamping mechanisms are slidably arranged on the guide rail, the clamping mechanisms clamp the U-rib to position it; when the welding of the U-rib is completed, all of the clamping mechanisms are moved to the attachment holder; and a welding assembly that is slidably arranged on the mounting holder or guide rail, is positioned between the two clamping mechanisms, is driven by the clamping mechanisms to move, and is used for welding the U-rib and the upper deck slab.

[0007] By adopting the above configuration, the upper deck slab is placed on the workbench and positioned using the positioning assembly. The U-rib is placed on the upper deck slab and positioned with both ends abutting the mounting holder, while the position of the U-rib is limited by the position limiting mechanism. The clamping mechanism then moves, moving from the mounting holder onto the guide rail. As the clamping mechanism moves onto the guide rail, it comes into contact with the U-rib, which is guided by the guide rail to position it. The clamping mechanism then positions itself relative to the U-rib, correcting any deformed areas. The movement of the clamping mechanism also drives the movement of the welding assembly, which then begins to weld the contact points between the U-rib and the upper deck slab. After welding is completed, the multiple clamping mechanisms and welding assemblies move to and remain on the mounting holder, after which the position limiting mechanism is released and the upper deck slab and U-rib can then be removed.

[0008] The clamping mechanism located in front of the welding assembly positions the U-rib before welding and corrects any deformed areas, while the clamping mechanism located behind the welding assembly continues to position and correct the U-rib after welding. At the same time, because the movement speed during welding is slow, the clamping mechanism can better position and correct the U-rib, greatly reducing the probability of deformation of the U-rib. At the same time, the clamping mechanism used for positioning and correction moves along with the movement of the welding assembly, thereby achieving positioning 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 improving welding efficiency and quality.

[0009] Preferably, the position limiting mechanism comprises: a position limiting plate and a sliding plate, the position limiting plate being disposed at one end of the mounting holder, and the sliding plate being disposed at the other end of the mounting holder along the direction in which the U-rib approaches or moves away, and the position limiting plate and the sliding plate are positioned by abutting against opposite side walls of the U-rib; and an elastic telescopic assembly, the elastic telescopic assembly being placed on a workbench and abutting against one end of the U-rib and away from the mounting holder by elastic force, the U-rib being abutted against both ends of the mounting holder and positioned, the elastic telescopic assembly being separated from the U-rib and positioned after the clamping mechanism has moved, and the elastic telescopic assembly being released after the worker has replaced the U-rib.

[0010] By adopting the above configuration, the U-rib is placed on the upper deck slab, the U-rib is abutted against both ends of the mounting holder and the position limiting plate, and then the sliding plate is brought close to the U-rib so that the position limiting plate and sliding plate abut against the opposing side walls of one end of the U-rib to position it, and then the elastic expansion and contraction assembly is released to abut against the U-rib, and then both ends of the U-rib are abutted against the mounting holder to position it, so positioning is performed when the clamping mechanism clamps the U-rib, reducing the probability of the U-rib moving due to the clamping mechanism and improving welding quality.

[0011] At the same time, after the clamping mechanism contacts the elastic telescopic assembly, it moves the elastic telescopic assembly away from the U-rib and finally positions the elastic telescopic assembly. Therefore, when the clamping mechanism and the elastic telescopic assembly are separated, the elastic telescopic assembly also maintains a distance from the U-rib, which means that the welding of the welding assembly also maintains a distance. This achieves positioning while reducing interference with the welding of the welding assembly, improving welding convenience and simultaneously improving welding quality and efficiency. Furthermore, after replacing the U-rib, the worker releases the elastic telescopic assembly and allows it to abut against the U-rib and position itself.

[0012] Preferably, the elastically elastic assembly comprises: a fixed rod disposed on the work table and having a positioning hole; a moving plate arranged to slide on the fixed rod along the direction in which the U-rib approaches or moves away; a first elastic member whose ends are connected to the movable plate and the fixed rod, respectively, and which positions the movable plate by abutting it against the U-rib using elastic force; a positioning member that is arranged to slide on the moving plate and whose sliding direction is perpendicular to the sliding direction of the moving plate; a second elastic member disposed on the positioning member and connected to the moving plate to move the positioning member closer to the positioning hole; The clamping mechanism moves the moving plate closer to the positioning hole while separating it from the U-rib, and positions the positioning member by inserting it into the positioning hole via a second elastic member.

[0013] By adopting the above configuration, the movable plate is abutted against the U-rib through the first elastic member to perform positioning, and after the clamping mechanism contacts the movable plate, it moves the movable plate away from the U-rib and, under the pressure of the second elastic member, moves the movable plate closer to the positioning hole until it is inserted into the positioning hole and positioned; at this time, a distance is maintained between the movable plate and the U-rib so that the clamping mechanism and welding assembly can move, thereby achieving positioning while reducing interference with the welding of the welding assembly.

[0014] On the other hand, after replacing the new U-rib and placing it on the upper deck, the U-rib is abutted against the position limiting plate and the mounting holder, and then the sliding plate is abutted against the U-rib to position it, the positioning member is removed from the positioning hole, and the moving plate is abutted against the U-rib under the action of the first elastic member to position it, allowing the welding work to continue, which greatly improves the positioning effect and convenience during positioning and at the same time improves the quality and efficiency of welding.

[0015] Preferably, a guide plate is arranged on the moving plate for guiding the clamping mechanism when the moving plate is pressed, and a guide wheel that abuts against the clamping mechanism is rotatably arranged on the moving plate.

[0016] By adopting the above-described configuration, the guide plate and the guide wheel can guide the clamping mechanism when it comes into contact with the moving plate, and at the same time, wear caused by the contact between the two can be reduced.

[0017] Preferably, the clamping mechanism comprises: a clamping holder and a plurality of first roller bodies; The plurality of first roller bodies are rotatably attached to a clamping holder, and are positioned by abutting against opposing side walls of an attachment holder or a guide rail, the clamping holder is slidably attached to the attachment holder or the guide rail, and when the plurality of first roller bodies move to the guide rail, they abut against the guide rail and the U-rib, and the U-rib is positioned under the guide of the guide rail to correct any deformed portions, a second roller body; the second roller body is rotatably attached to the clamping holder and abuts against the upper part of the mounting holder or the guide rail for positioning; Two adjacent clamping holders are connected to each other via a connection assembly, which is straightened during welding to enable simultaneous movement of multiple clamping holders and is connected so that the multiple clamping holders abut each other after welding is completed.A drive assembly is disposed on each of the two clamping holders located at the head and tail ends to rotate the first roller body and thereby enable movement of the clamping holders.

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

[0019] When welding is completed, the first clamping holder moves to the mounting holder and then stops. The drive assembly on the last clamping holder is started, and the movement of the last clamping holder causes the front clamping holder to move, and the multiple clamping holders are moved until all of them have moved to the mounting holder and been positioned. Since two drive assemblies are used to position all of the clamping holders, the positioning and correction of the U-rib can be performed at multiple intervals, balancing the force received by the U-rib and reducing the space occupied by the multiple clamping holders when they are positioned. This reduces the space occupied by the mounting holder and shortens the time it takes for the clamping holders to move on the mounting holder, further improving welding quality and efficiency.

[0020] Preferably, the connection assembly comprises: two connecting screw rods threadedly connected to two clamping holders and covered with connecting rings; a connecting rope having both ends disposed in two connecting rings.

[0021] By adopting the above configuration, when the clamping holder located at the front pulls the connection rope, the multiple clamping holders move together, and the clamping holder located at the rear moves in contact with the clamping holder located at the front. The connecting threaded rod can be twisted to separate it from the connecting ring, allowing the connection rope and connecting ring to be removed and replaced. When installing, the connecting ring is placed over the connecting threaded rod, and the connecting threaded rod is twisted to contact the clamping holder, thereby allowing the connection rope to be replaced.

[0022] Preferably, the drive assembly comprises: a drive motor disposed in the clamping holder; Two sub-gears respectively disposed on the first roller body on both sides of the mounting holder; a main gear disposed on the drive motor and meshing with the plurality of sub-gears;

[0023] By adopting the above configuration, the drive motor is started to rotate the main gear, which then rotates the two sub-gears, 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 deformation.

[0024] Preferably, the welding assembly comprises: a welding holder disposed by sliding on the U-rib via two welding rollers; The two welding rollers are rotatably attached to the welding holder and are positioned by contacting the opposing side walls of the U-rib, and the welding holder and the clamping holder are connected via a connection assembly and are driven and moved by the clamping holder; and a welding torch disposed in the welding holder and welding the U-rib and the upper deck slab together.

[0025] By adopting the above configuration, the movement of the clamping holder causes the welding holder to move, and at the same time, the welding holder changes its direction and angle through the two welding rollers, adapting the position and angle of the welding torch and U-rib, and the welding torch begins welding, thereby achieving welding and improving welding quality.

[0026] Preferably, the positioning assembly comprises: a first positioning plate and a second positioning plate; The first positioning plate and the second positioning plate are arranged on a workbench and are respectively abutted against adjacent side walls of the upper deck slab for positioning. [Effects of the Invention]

[0027] As described above, the present application includes at least one of the following beneficial technical effects: The clamping mechanism located in front of the welding assembly positions the U-rib before welding and corrects any deformed areas, while the clamping mechanism located behind the welding assembly positions and continues to correct the U-rib after welding. The movement speed during welding is slow, and the clamping mechanism can better position and correct the U-rib, greatly reducing the probability of U-rib deformation. The clamping mechanism used for positioning and correction moves as the welding assembly moves, so positioning is achieved and interference with the welding assembly is reduced. The clamping mechanism also moves simultaneously with the welding assembly, greatly improving processing efficiency, saving energy, and improving welding efficiency and quality. [Brief explanation of the drawings]

[0028] [Figure 1] FIG. [Figure 2] FIG. 2 is a structural schematic diagram of a position limiting mechanism in the fixing device. [Figure 3] 1 is a structural schematic diagram of the elastic expansion assembly in the fixed device, which is now separated from the U-rib, and also shows a cross-sectional view of the side walls of the fixed rod and the moving rod. [Figure 4] 1 is a structural schematic diagram of a mounting holder and a clamping mechanism in a fixing device. [Figure 5] FIG. 2 is a structural schematic diagram of a welding assembly in a fixing device. DETAILED DESCRIPTION OF THE INVENTION

[0029] The present application will be described in more detail below with reference to the accompanying drawings.

[0030] The embodiment of the present application discloses a positioning and fixing device for welding a steel box girder U-rib.

[0031] Please refer to Figure 1. This is a positioning and fixing device for welding U-ribs on steel box girders, and includes a workbench 1 for placing an upper deck slab 14, and a fixing device 2 arranged on the workbench 1, and the fixing device 2 is used to place a U-rib 13 on the workbench 1, and to position and weld the U-rib 13.

[0032] The upper surfaces of the upper deck 14 and the machine base 1 are both horizontal, the upper deck 14 has a rectangular or cuboid structure, and is horizontal when placed on the machine base 1, while at the same time ensuring that the strength and thickness of the machine base 1 meet the desired requirements, thereby reducing the probability of vertical deformation during welding of the upper deck 14.

[0033] Referring to Figures 1 and 2, the fixing equipment 2 includes a mounting holder 21 and a positioning assembly 22, and a first rod body 11 and a second rod body 12 extending above the workbench 1 are fixedly attached to opposite side walls of the workbench 1, respectively, and the first rod body 11 and the second rod body 12 are arranged opposite each other, and the mounting holder 21 has a "U"-shaped structure in a horizontal state, and the side wall of the mounting holder 21 facing away from the U-shaped opening is fixedly attached to one end of the first rod body 11 and close to the second rod body 12, and the mounting holder 21 is positioned above the upper deck slab 14 so that both ends of the mounting holder 21 are away from the first rod body 11, and when the U-rib 13 is placed on the upper deck slab 14, both ends abut against both ends of the mounting holder 21, respectively, to be positioned.

[0034] The positioning assembly 22 is placed on the workbench 1 and is used to position the upper deck 14. The positioning assembly 22 includes a first positioning plate 23 and a second positioning plate 24 that are fixed at an interval on the upper surface of the workbench 1 and are in a vertical state. The first positioning plate 23 and the second positioning plate 24 are positioned by abutting against adjacent both side walls of the upper deck 14, respectively. The upper deck 14 is placed on the upper surface of the workbench 1 and positioned by abutting against the first positioning plate 23 and the second positioning plate 24.

[0035] The fixing equipment 2 includes a position limiting mechanism 3, a guide rail 25 and multiple 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 compatible with the U-rib 13 and has the same dimensions and shape. The mounting holder 21 also has 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. The heights of the tops of both the guide rail 25 and the mounting holder 21 are the same.

[0036] The multiple clamping mechanisms 4 are arranged so that they slide head-to-tail on the mounting holder 21 or guide rail 25, and before welding, the multiple clamping mechanisms 4 remain in place on the mounting holder 21, but when the clamping mechanisms 4 slide onto the guide rail 25, they clamp the U-rib 13 with the guide rail 25 to position it and correct any deformation, so that the strength of the guide rail 25 is greater than that of the U-rib 13. The welding assembly 8 is attached to the mounting holder 21 or guide rail 25 so that it slides, and is located 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 and the upper deck slab 14 together.

[0037] 1 to 3, the position limiting mechanism 3 includes a position limiting plate 31, a sliding plate 32, and an elastic telescopic assembly, the position limiting plate 31 is arranged at one end of the mounting holder 21, and the sliding plate 32 is arranged 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 opposite 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 deck slab 14, and the U-rib 13 is abutted against the side wall of the position limiting plate 31 and both ends of the mounting holder 21, and then the sliding plate 32 is abutted against the U-rib 13 to position one end of the U-rib 13.

[0038] The elastic expansion and contraction assembly 33 is provided on the second rod body and abuts against one end of the U-rib 13 away from the mounting holder 21 by elastic force, the U-rib 13 abuts against both ends of the mounting holder 21 and is positioned, when the clamping mechanism 4 moves the elastic expansion and contraction assembly 33 is positioned so as to be separated from the U-rib 13, when the worker replaces the U-rib 13 the elastic expansion and contraction assembly 33 is released and continues to abut against the U-rib 13 and is positioned.

[0039] The elastic telescopic assembly 33 includes a fixed rod 34, a moving plate 35, a first elastic member 36, a positioning member 37, and a second elastic member 38. The fixed rod is fixedly attached to one end of the second rod body 12 near the first rod body 11 and is located above the upper deck slab 14. At the same time, the longitudinal direction of the fixed rod 34 is parallel to the longitudinal direction of the U-rib 13. The fixed rod 34 has a fixed groove 34 in the longitudinal direction at one end near the U-rib 13. 1 is opened in the upper surface of the fixed rod 34, and a positioning hole 342 that is perpendicular to the fixed groove 341 and communicates with the fixed groove 341 is opened in the upper surface of the fixed rod 34, and the movable plate 35 is attached by sliding into the fixed groove 341 via the movable rod 351, and the movable rod 351 is fixedly attached to one side wall of the first rod body 11 on the movable plate 35 so that the movable plate 35 approaches or moves away from the U-rib 13, and the movable plate 35 is attached to the side wall of the U-rib 13 in an arc shape.

[0040] 2 and 3, a moving groove is formed on the upper surface of the moving rod 351, and the positioning member 37 is mounted in the moving groove and slides vertically, perpendicular to the moving direction 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 into the moving rod 351, with both ends abutting against the fixed rod 34 and the moving plate 35. The first elastic member 36 positions the moving plate 35 by moving it toward the end of the U-rib 13 that is away from the mounting holder 21. The second elastic member 38 is fixedly mounted on the bottom of the positioning member 37 and abuts against the bottom of the moving groove. The second elastic member 38 moves the positioning member 37 upward toward the fixed rod 34 and the positioning hole 342.

[0041] The movable plate 35 abuts against the U-rib 13 and is positioned by the elastic force of the first elastic member 36, and 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 until the positioning member 37 overlaps with the positioning hole 342, causing the movable rod 351 and the positioning member 37 to approach the positioning hole 342, and the positioning member 37 is inserted into the positioning hole 342 by the second elastic member 38, creating an escape space between the movable plate 35 and the U-rib 13, allowing the clamping mechanism 4 and the welding assembly 8 to pass through.

[0042] Guide plates 352 are fixedly attached to both ends of the movable plate 35, and one end of the guide plate 352 that is away from the movable plate 35 is installed facing away from the U-rib 13, and a vertical guide plate is rotatably attached to one side wall of the guide plate 352.When the clamping mechanism 4 approaches, it abuts against 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 that the guide plate 352 guides the clamping mechanism 4 as it moves the movable plate 35.

[0043] 1 and 4, the clamping mechanism 4 is in the same state when positioned at two locations, the clamping holder 41 or the guide rail 25. Therefore, an example in which the clamping mechanism 4 is positioned at the mounting holder 21 will be described below. The clamping mechanism 4 includes a 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 is covered by the mounting holder 21. The number of first roller bodies 42 is an even number and is located on both sides of the mounting holder 21, facing each other. The first roller body 42 is rotatably attached to the inner wall of the clamping holder 41 and is in a vertical state. The plurality of first roller bodies 42 located on both sides of the mounting holder 21 are respectively in contact with the opposing side walls of the mounting holder 21, and when the plurality of first roller bodies 42 rotate, the clamping holder 41 is moved.

[0044] The second roller body 43 is rotatably mounted on the inner wall of the clamping holder 41 and is horizontal, with gravity causing the second roller body 43 to roll to the top of the mounting holder 21. Two adjacent clamping holders 41 are connected by a connection assembly 6, and multiple clamping holders 41 are connected head to tail, with each of the two leading and trailing clamping holders 41 being equipped with a drive assembly 7 for moving and rotating the first roller body 42. A welding assembly 8 is located between two adjacent clamping holders 41 and is connected to the front clamping holder 41 via the connection assembly 6. When the clamping holder 41 moves, the connection assembly 6 is first tensioned to move the welding assembly 8, and then the clamping holder 41 is moved for a certain period of time, after which the connection assembly 6 connected to the rear clamping holder 41 is tensioned, allowing multiple clamping holders 41 to move simultaneously.

[0045] 1 and 4, during welding, the drive unit 7 located on the first clamping holder 41 rotates the two first roller bodies 42 to move the clamping holder 41, thereby rotating the other first roller bodies 42 and second roller body 43. After the first clamping holder 41 has moved for a certain period of time, it straightens the connection assembly 6, causing the rear clamping holder 41 to move together. In turn, multiple clamping holders 41 move together, and the multiple first roller bodies 42 move from the mounting holder 21 to the guide rail 25 and U-shaped rib 13. The multiple first roller bodies 42 abut against the guide rail 25 to provide positioning guidance, and the multiple first roller bodies 42 abut against the U-shaped rib 13 to position the U-shaped rib 13 and correct any deformation of the U-shaped rib 13. At the same time, one end of the clamping holder 41 drives the welding assembly 8 to perform welding, thereby reducing the likelihood of longitudinal deformation and movement of the U-shaped rib 13 during welding.

[0046] When welding is completed, 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 activates the last clamping holder 41 to continue moving forward, so that the latter clamping holder 41 moves the former clamping holder 41 forward, and stops until all the clamping holders 41 have moved onto the mounting holder 21, and at the same time, the drive assembly 7 located at the back simultaneously positions the plurality of clamping holders 41.

[0047] Referring to Figures 1 and 4, the connection assembly 6 includes two connecting threaded rods 61 and a connecting rope 62. A clamping groove is opened on each of the opposing side walls of the two clamping holders 41. The two connecting threaded rods 61 pass vertically through the upper surfaces of the clamping holders 41 and are inserted into the clamping grooves to abut against the bottom of the clamping grooves. The connecting threaded rods 61 are covered with connecting rings 63 which are located in the clamping grooves. Both ends of the connecting rope 62 are fixedly attached to the connecting rings 63. After the clamping holders 41 move, the connecting rope 62 can be taut to pull the rear clamping holder 41 and move together with it, and at the same time, the rear clamping holder 41 can move and abut against 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 attached to the upper surface of the clamping holder 41, with its output shaft extending in the vertical direction. The two first roller bodies 42 located on both sides of the mounting holder 21 extend vertically upward above the clamping holder 41, and the two sub-gears 72 are respectively connected to the two first roller bodies 42 and located above the clamping holder 41. The main gear 73 is connected to the output shaft of the drive motor 71 and is located between the two sub-gears 72 and meshes with them.

[0049] 1 and 5, welding assembly 8 includes welding holder 81 and welding torch 82. Welding holder 81 is fitted over mounting holder 21, which is arranged to extend into welding holder 81. Welding rollers 83 are rotatably attached to the inner wall of welding holder 81 and on both sides of mounting holder 21, and both welding rollers 83 are positioned vertically in contact with the side walls of mounting holder 21. Welding torch 82 is fixedly attached to the bottom of welding holder 81 and is used to weld upper deck slab 14 and U-rib 13.

[0050] The working principle of the embodiment of the present application is as follows: The upper deck 14 is placed on the workbench 1, and the upper deck 14 is positioned by abutting it against the first positioning plate 23 and the second positioning plate 24, then the U-rib 13 is placed on the upper deck 14, and the U-rib 13 is abutted against the side wall of the position limiting plate 31 and both ends of the mounting seat 21, and then the sliding plate 32 is moved to abut against the U-rib 13 to position one end of the U-rib 13, the positioning plate 37 is pushed out and removed from the positioning hole 342, and the movable plate 35 is abutted against 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 the 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 abut on the U-rib 13 to position it and correct any deformation. The movement of the clamping holder 41 moves the welding holder 81 and the welding torch 82, and when the welding torch 82 moves to the contact point between the U-rib 13 and the upper deck slab 14, the welding torch 82 starts welding, clamping holder 41 moves to guide plate 352 to move guide plate 352 and movable plate 35 away from U-rib 13, and movable plate 35 moves to insert and position positioning member 37 into positioning hole 342, thereby forming an escape space between movable plate 35 and U-rib 13 for the subsequent clamping holder 41 and welding holder 81 to pass through, and first roller body 42 located in front of welding torch 82 can be used to position and correct U-rib 13. Meanwhile, first roller body 42 located behind welding torch 82 continues to position U-rib 13, improving welding efficiency and quality.

[0052] When welding is completed, 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 to move the clamping holder 41, which then moves the previous clamping holder 41 forward, until all of the clamping holders 41 have moved and positioned themselves on the mounting holder 21, and the two drive motors 71 stop after positioning all of the clamping holders 41. Then the sliding plate 32 moves away from the U-rib 13, and then the upper deck slab 14 and U-rib 13 can be removed. Finally, the upper deck slab 14 is replaced so that the subsequent welding work can continue, improving welding efficiency and quality.

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

[0054] 1, work table; 11, first rod body; 12, second rod body; 13, U-rib; 14, upper floor slab; 2, fixing device; 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 and contraction assembly; 34, fixed rod; 341, fixing groove; 342, positioning hole; 35, moving plate; 351, moving rod; 352, guide Dot plate; 36, first elastic member; 37, positioning member; 38, second elastic member; 4, clamping mechanism; 41, clamping holder; 42, first roller body; 43, second roller body; 6, connection 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 steel box girder U-rib welding processing, The system includes a work platform (1) for placing an upper deck (14), and a fixing device (2) arranged on the work platform (1), the fixing device (2) including: an attachment holder (21) attached to the workbench (1) and positioned above the upper floor slab (14) to position the U-rib (13) by abutting it against the attachment holder (21); a positioning assembly (22) attached to the work platform (1) and used to position the upper deck (14); a position limiting mechanism (3) used to position the U-rib (13); a guide rail (25) attached to the mounting holder (21) and positioned above the U-rib (13) in correspondence with the U-rib (13); A plurality of clamping mechanisms (4) are successfully connected to each other, slidably connected to each other, and attached to an attachment holder (21) or a guide rail (25). When the plurality of clamping mechanisms (4) are slidably arranged on the guide rail (25), the clamping mechanisms (4) are clamped to the U-rib (13) to position them. When the welding of the U-rib (13) is completed, all of the clamping mechanisms (4) are moved to the attachment holder (21). and a welding assembly (8) that is slidably arranged on an attachment holder (21) or a guide rail (25), is positioned between two clamping mechanisms (4), and is driven by the clamping mechanisms (4) to move and is used for welding the U-rib (13) and the upper deck (14).

2. The position limiting mechanism (3) The present invention includes a position limiting plate (31) and a sliding plate (32), wherein the position limiting plate (31) is disposed at one end of the mounting holder (21), and the sliding plate (32) is disposed at the other end of the mounting holder (31) along the direction in which the U-rib (13) approaches or moves away, and the position limiting plate (31) and the sliding plate (32) are positioned by abutting against both opposing side walls of the U-rib (13), and an elastic telescopic assembly (33), wherein the elastic telescopic assembly (33) is arranged on the workbench (1) and abuts against one end of the U-rib (13) and away from the mounting holder (21) by elastic force, and positions the U-rib (13) by abutting against both ends of the mounting holder (21), and after the clamping mechanism (4) moves, the elastic telescopic assembly (33) is positioned away from the U-rib (13), and the elastic telescopic assembly (33) is released after the worker replaces the U-rib (13).

3. The elastic elastic assembly (33) a fixed rod (34) disposed on the work table (1) and having a positioning hole (342); a moving plate (35) arranged to slide on the fixed rod (34) along the direction in which the U-rib (13) approaches or moves away from the fixed rod (34); a first elastic member (36) whose ends are connected to the movable plate (35) and the fixed rod (34), respectively, and which positions the movable plate (35) by abutting it against the U-rib (13) by elastic force; a positioning member (37) that is arranged to slide on the moving plate (35) and whose sliding direction is perpendicular to the sliding direction of the moving plate (35); a second elastic member (38) disposed on the positioning member (37) and connected to the moving plate (35) to move the positioning member (37) closer to the positioning hole (342); A positioning and fixing device for welding U-ribs of steel box girder as described in claim 2, characterized in that the clamping mechanism (34) moves the movable plate (35) closer to the positioning hole (342) while moving it away from the U-rib (13), and positions the positioning member (37) by inserting it into the positioning hole (342) through a second elastic member (37).

4. The positioning and fixing device for steel box girder U-rib welding processing as described in claim 3, characterized in that a guide plate (352) that guides the clamping mechanism (4) when the movable plate (35) is pressed is arranged on the movable plate (35), and a guide wheel that abuts against the clamping mechanism (4) is rotatably arranged on the movable plate (352).

5. The clamping mechanism (4) The apparatus includes a clamping holder (41) and a plurality of first roller bodies (42), The plurality of first roller bodies (42) are rotatably attached to a clamping holder (41), and are positioned by abutting against opposing side walls of the mounting holder (21) or the guide rail (25), the clamping holder (41) is slidably attached to the mounting holder (21) or the guide rail (25), and when the plurality of first roller bodies (42) move to the guide rail (25), they abut against 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 portions, a second roller body (43); The second roller body (43) is rotatably attached to the clamping holder (41) and is positioned by being brought into contact with the upper part of the mounting holder (21) or the guide rail (25).

2. The positioning and fixing device for welding U-ribs of steel box girder as claimed in claim 1, wherein two adjacent clamping holders (41) are connected to each other via a connection assembly (6), the connection assembly (6) is straightened during welding to realize simultaneous movement of the multiple clamping holders (41), and the multiple clamping holders (41) are connected so as to abut against each other after welding is completed, and a drive assembly (7) is disposed on each of the two clamping holders (41) located at the head and tail ends to rotate a first roller body (42) to realize movement of the clamping holder (41).

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

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

8. The welding assembly (8) a welding holder (81) arranged to slide on the U-rib (13) via two welding rollers (83); The two welding rollers (83) are rotatably attached to the welding holder (81) and are positioned by being abutted against opposite side walls of the U-rib (13), and the welding holder (81) and the clamping holder (41) are connected via a connection assembly (6) and are driven and moved by the clamping holder (41); 6. The positioning and fixing device for welding a steel box girder U-rib as claimed in claim 5, further comprising a welding torch (82) disposed in the welding holder (81) and welding the U-rib (13) and the upper deck (14).

9. The positioning assembly (22) A first positioning plate (23) and a second positioning plate (24), 2. A positioning and fixing device for steel box girder U-rib welding processing according to claim 1, wherein the first positioning plate (23) and the second positioning plate (24) are arranged on a workbench (1) and are respectively abutted against adjacent both side walls of the upper deck (14) to position them.

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