Steel box beam welding device and welding method

Abstract

The present invention relates to the technical field of steel box girder welding, and specifically discloses a steel box girder welding device and a welding method. The steel box girder welding device includes a platform, a mobile frame and a welding mechanism. The mobile frame is provided with a bearing frame, and the bearing frame is provided with a rolling assembly and a driving assembly 1 that drives the rolling assembly to contact the top surface of the U-shaped rib of the steel box girder; the bearing frame is provided with two symmetrically distributed clamping assemblies and a driving assembly 2 that drives the clamping assembly to contact the two side surfaces of the U-shaped rib. The clamping assembly includes a mounting frame and a clamping plate connected to the mounting frame, and a crawler is provided around the outer periphery of the clamping plate. The mounting frame is provided with a driving assembly 3 that drives the crawler to rotate. The driving assembly 3 drives the crawler to rotate in accordance with the moving speed of the mobile frame, so that no sliding friction occurs between the crawler and the U-shaped rib. The steel box girder welding device and the welding method of the present invention avoid the wear of the U-shaped rib caused by sliding friction, and ensure the smooth movement of the mobile frame and the continuous progress of the welding operation.

Description

Technical Field

[0001] The invention relates to the technical field of steel box girder welding, and in particular to a steel box girder welding device and a welding method. Background Art

[0002] Stiffeners are auxiliary components in steel box girders, used to enhance the bearing capacity of the top plate, bottom plate and web. U-shaped ribs, as longitudinal stiffeners, have good torsional resistance and stiffening effects, which help reduce stress concentration and fatigue damage in bridge structures, and improve the durability, overall stability and safety of bridges.

[0003] A Chinese patent with publication number CN116852014B discloses a bidirectional welding device for a U-shaped rib of a steel box girder top plate, comprising: a welding platform, the welding platform is used to support the steel box girder top plate and the U-shaped rib; a slide, the slide is connected to both sides of the welding platform and is used to move a gantry; a welding gun, two of the welding guns are connected under the gantry and arranged on both sides of the U-shaped rib; a local positioning unit, the local positioning unit comprises a first clamping plate, a second clamping plate and an adjustment frame, the first clamping plate is horizontally arranged, and two of the second clamping plates are arranged on both sides of the first clamping plate to form a clamping surface adapted to the U-shaped rib.

[0004] The above patent clamps the U-shaped rib by placing the first clamping plate against the top surface of the U-shaped rib and the two second clamping plates against the side surfaces of the U-shaped rib. During welding, as the gantry moves, the first clamping plate and the second clamping plate move on the U-shaped rib to maintain stability at the welding position.

[0005] However, in the actual implementation process, since the first and second clamps are always in contact with the U-shaped ribs, sliding friction will occur between the first and second clamps and the U-shaped ribs as they move with the gantry, which will cause wear on the U-shaped ribs. On the other hand, since the U-shaped ribs may deform during welding, when the first and second clamps pass through the deformation site, the movement of the gantry will be blocked, and the movement process will not be smooth, so that the movement process of the welding gun installed on the gantry will not be smooth, affecting the quality of the weld. If the first and second clamps are separated from the U-shaped ribs and welding is suspended when the gantry moves, the weld will be discontinuous, affecting the welding quality.

[0006] Therefore, the art needs a steel box girder welding device and a welding method to solve the above problems. Summary of the invention

[0007] The present invention provides a steel box girder welding device and a welding method, aiming to solve the problem that when the welding device in the related art clamps and positions the U-shaped rib of the steel box girder, the movement process of the welding gun will be unstable, the weld quality will be affected, and the U-shaped rib will be worn.

[0008] On the one hand, the present invention provides a steel box beam welding device, comprising a platform, a mobile frame arranged on the platform and a welding mechanism arranged on the mobile frame, wherein the mobile frame is provided with a bearing frame, and the bearing frame is provided with a rolling assembly and a driving assembly for driving the rolling assembly to contact the top surface of the U-shaped rib of the steel box beam;

[0009] The carrier is provided with two symmetrically distributed clamping assemblies and a second driving assembly for driving the clamping assemblies to contact the two sides of the U-shaped rib, the clamping assembly includes a mounting frame and a clamping plate fixedly connected to the mounting frame, a crawler is provided around the outer periphery of the clamping plate, and a third driving assembly for driving the crawler to rotate is provided on the mounting frame;

[0010] When the mobile frame moves along the extension direction of the U-shaped rib, the portion of the track located on the side of the clamping plate facing the U-shaped rib contacts the side of the U-shaped rib, and the driving component three drives the track to rotate to match the moving speed of the mobile frame so that no sliding friction occurs between the track and the U-shaped rib.

[0011] The rolling assembly is pressed against the top of the U-shaped rib downward, applying pressure from top to bottom to stabilize the U-shaped rib. The clamping assembly is pressed against both sides of the U-shaped rib, effectively clamping the two sides of the U-shaped rib, ensuring the overall stability of the U-shaped rib during the welding operation and significantly reducing the deformation that may occur in the welding part. In addition, the clamping plate of the clamping assembly is equipped with a track. When the drive assembly drives the track to rotate, the track can pull the clamping assembly to move smoothly along the side wall of the U-shaped rib. By setting the speed at which the track drives the clamping assembly to move along the side of the U-shaped rib to be completely synchronized with the travel speed of the gantry, the sliding friction between the track and the side wall of the U-shaped rib is avoided. This design enables the clamping plate to continuously and stably clamp the side wall of the U-shaped rib during the process of the gantry pulling the welding gun to continuously weld the U-shaped rib, while avoiding the wear of the U-shaped rib caused by sliding friction, further ensuring the smooth movement of the gantry and the continuous progress of the welding operation.

[0012] Preferably, the driving component three includes a motor three, a rotating roller one and a rotating roller two, the rotating roller one and the rotating roller two are respectively rotatably connected to the mounting frame, and the rotating roller one and the rotating roller two are respectively in contact with the inner side of the track, the motor three is fixedly installed on the mounting frame, the rotating roller one is connected to the output end of the motor three, the motor three drives the rotating roller one to rotate, and the rotating roller one drives the track and the rotating roller two to rotate.

[0013] Preferably, the welding mechanism includes two welding guns symmetrically arranged on both sides of the U-shaped rib, the two welding guns are installed on the mounting frame, and a pre-shaping mechanism is provided on the mounting frame. The pre-shaping mechanism is located in front of the welding gun along the forward direction of the movable frame, and the pre-shaping mechanism is used to correct the position of the U-shaped rib to be welded.

[0014] Preferably, the pre-shaping mechanism includes a shaping roller and an automatic telescopic cylinder that drives the shaping roller to reciprocate along the extension direction of the U-shaped rib, the automatic telescopic cylinder is installed on the corresponding clamping plate, and the driving end of the automatic telescopic cylinder is fixedly connected to the U-shaped frame, the shaping roller is rotatably connected to the U-shaped frame, the shaping roller is located on the front side of the clamping plate along the extension direction of the U-shaped rib, and the shaping roller abuts against the inner side of the track, when the clamping plate is clamped on both sides of the U-shaped rib, a deformation space is reserved between the shaping roller and the side surface of the U-shaped rib, and a tensioning mechanism for tensioning the track is provided in the mounting frame.

[0015] When the deformation degree of the U-shaped rib at the welding position exceeds the deformation space, the automatic telescopic cylinder will pre-shape the deformed part while driving the shaping roller to move back and forth to avoid the deformation position affecting the continuity and stability of welding.

[0016] Preferably, the tensioning mechanism includes a tensioning roller and an elastic telescopic rod, the tensioning roller is slidably connected to the mounting frame in a direction perpendicular to the side of the U-shaped rib, the elastic telescopic rod is connected between the tensioning roller and the clamping plate, and the elastic telescopic rod pushes the tensioning roller to contact the inner side of the track.

[0017] When the shaping roller moves forward, the crawler belt squeezes the tensioning roller to shrink the elastic telescopic rod 1. When the shaping roller moves backward, the elastic force of the elastic telescopic rod 1 pushes the tensioning roller to move away from the clamping plate to tension the crawler belt.

[0018] Preferably, the clamping plate includes a clamping portion and a pushing portion, the clamping portion is fixedly connected to the mounting frame, and the clamping portion is provided with a through groove for accommodating the pushing portion, one end of the elastic telescopic rod one is fixedly connected to the pushing portion, and the other end is fixedly connected to the U-shaped frame two, the tensioning roller is rotatably connected to the U-shaped frame two, and during the reciprocating movement of the shaping roller along the extension direction of the U-shaped rib, the tensioning roller is squeezed by the crawler so that the elastic telescopic rod intermittently squeezes the pushing portion to push the side of the U-shaped rib.

[0019] When the shaping roller moves forward, the crawler belt squeezes the tensioning roller to make the elastic telescopic rod squeeze the pushing part, thereby increasing the pressure between the pushing part and the U-shaped rib, thereby further shaping the side surface of the U-shaped rib.

[0020] Preferably, the rolling assembly includes a rolling roller and two elastic telescopic rods, the two elastic telescopic rods are vertically arranged, and the top end of the two elastic telescopic rods is fixedly connected to the supporting frame, and the bottom end is fixedly connected to a U-shaped frame three, and the rolling roller is rotatably connected to the U-shaped frame three.

[0021] Preferably, the driving assembly 1 includes an automatic telescopic cylinder 2 extending vertically, the top end of the automatic telescopic cylinder 2 is fixedly connected to the movable frame, and the bottom end is fixedly connected to the supporting frame.

[0022] The second automatic telescopic cylinder drives the carrier frame to move in the vertical direction so that the rolling roller below the carrier frame is pressed against the top surface of the U-shaped rib or is out of contact with the U-shaped rib.

[0023] Preferably, the second driving component includes a guide rod, a lead screw and a second motor, the guide rod is arranged parallel to the lead screw, and the guide rod is fixedly connected to the support frame, the lead screw is rotatably connected to the support frame, the second motor is fixedly installed on the support frame, the lead screw is fixedly connected to the output end of the second motor, the lead screw is provided with thread segments with opposite thread rotation directions, the mounting frame is fixedly connected with a support plate, the support plate is slidably matched with the guide rod and matched with the corresponding thread segment on the lead screw, and the second motor drives the lead screw to drive the two support plates to move towards or away from each other.

[0024] On the other hand, the present invention further provides a steel box girder welding method, the steel box girder welding method uses the steel box girder welding device described in any one of the above preferred technical solutions, and the steel box girder welding method comprises the following steps:

[0025] Laying the steel box girder top plate on the platform, and placing the U-shaped rib on the steel box girder top plate;

[0026] Controlling the movable frame to move until the rolling assembly is located above the U-shaped rib and the two clamping assemblies are located on both sides of the U-shaped rib;

[0027] Control the driving component 1 to drive the rolling component to contact the top surface of the U-shaped rib, and control the driving component 2 to drive the two clamping components to move toward the U-shaped rib until the clamping plate causes the crawler to contact the side surface of the U-shaped rib;

[0028] The welding mechanism is controlled to start welding, the movable frame is controlled to move along the extension direction of the U-shaped rib, and the driving component three is controlled to drive the track to rotate at the same time, so that the track does not have sliding friction with the side surface of the U-shaped rib while following the movement of the movable frame.

[0029] The beneficial effects of the steel box girder welding method of the present invention are the same as the beneficial effects of the steel box girder welding device of the present invention, which will not be described in detail here.

[0030] The beneficial effects of the present invention are as follows: the present invention presses and fixes the U-shaped rib from top to bottom by the rolling component abutting against the top of the U-shaped rib downwards, and the clamping component abuts against the two sides of the U-shaped rib to clamp and fix the two side surfaces of the U-shaped rib, thereby ensuring the overall stability of the U-shaped rib during welding and improving the deformation at the welding position;

[0031] By setting the speed at which the crawler drives the clamping assembly to move along the side of the U-shaped rib to be the same as the moving speed of the gantry, it is achieved that no sliding friction occurs between the crawler and the side of the U-shaped rib, so that the clamping plate can continuously clamp the side of the U-shaped rib without sliding friction with the side of the U-shaped rib, thereby reducing the wear on the U-shaped rib and ensuring the stability of the gantry movement process and the continuity of the welding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a front view of a steel box girder welding device of the present invention.

[0033] Figure 2 The utility model is a schematic diagram of the overall structure of a steel box girder welding device of the present invention.

[0034] Figure 3 It is a schematic diagram of a rolling assembly and a clamping assembly of a steel box girder welding device of the present invention from a first viewing angle.

[0035] Figure 4 It is a schematic diagram of a rolling assembly and a clamping assembly of a steel box girder welding device of the present invention from a second viewing angle.

[0036] Figure 5 It is a schematic diagram of a clamping assembly of a steel box girder welding device of the present invention from a first viewing angle.

[0037] Figure 6 It is a schematic diagram of a clamping assembly of a steel box girder welding device of the present invention from a second viewing angle.

[0038] Figure 7 This is a schematic diagram of a clamping assembly of a steel box girder welding device of the present invention with the mounting frame hidden.

[0039] Figure 8 This is a schematic diagram of a clamping assembly of a steel box girder welding device of the present invention with the mounting frame and crawler hidden.

[0040] Reference numerals:

[0041] 1. Platform; 11. Walking groove; 2. Gantry; 21. Walking wheel; 3. U-shaped rib; 4. Carrying frame; 41. Guide rod; 42. Lead screw; 43. Motor 2; 5. Mounting frame; 50. Support plate; 51. Clamping plate; 511. Clamping part; 512. Pushing part; 52. Track; 53. Top plate; 531. Slide 1; 532. Slide 2; 54. Bottom plate; 55. Connecting rod; 56. Motor 3; 561, driving wheel one; 57, rotating roller one; 571, driving wheel two; 58, rotating roller two; 59, driving belt; 6, welding gun; 7, shaping roller; 71, automatic telescopic cylinder one; 72, U-shaped frame one; 8, tensioning roller; 81, elastic telescopic rod one; 82, U-shaped frame two; 9, rolling roller; 91, elastic telescopic rod two; 92, U-shaped frame three; 93, automatic telescopic cylinder two; 10, steel box girder top plate. DETAILED DESCRIPTION

[0042] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0043] like Figures 1 to 8 As shown, a steel box girder welding device of the present invention includes a platform 1, a mobile frame arranged on the platform 1, and a welding mechanism arranged on the mobile frame. The mobile frame includes a gantry 2 and a walking wheel 21 arranged at the bottom of the gantry 2, and the walking wheel 21 is connected to a driving motor (not shown in the figure). A walking groove 11 for the walking wheel 21 to move is opened on the platform 1, and the driving motor drives the walking wheel 21 to drive the gantry 2 to move along the extension direction of the walking groove 11. When welding the U-shaped rib 3 of the steel box girder, the arrangement direction of the U-shaped rib 3 is the same as the extension direction of the walking groove 11, and the extension direction of the walking groove 11 is defined as the front-to-back direction, that is, the extension direction of the U-shaped rib 3 is the front-to-back direction.

[0044] The mobile frame is provided with a carrier frame 4, on which a rolling assembly and a driving assembly 1 for driving the rolling assembly to contact the top surface of the U-shaped rib 3 of the steel box beam are provided. The carrier frame 4 is provided with two clamping assemblies symmetrically distributed on both sides of the U-shaped rib 3 and a driving assembly 2 for driving the clamping assembly to contact the two side surfaces of the U-shaped rib 3. The clamping assembly includes a mounting frame 5 and a clamping plate 51 fixedly connected to the mounting frame 5, a crawler 52 is provided around the outer periphery of the clamping plate 51, and a driving assembly 3 for driving the crawler 52 to rotate is provided on the mounting frame 5.

[0045] The welding mechanism includes two welding guns 6 symmetrically distributed on both sides of the U-shaped rib 3. When welding between the U-shaped rib 3 and the top plate 10 of the steel box girder, the driving motor is controlled to drive the walking wheel 21 to move, so that the gantry 2 drives the rolling component and the clamping component to move to one end of the U-shaped rib 3, and stays at a position where the rolling component is located above the U-shaped rib 3 and the two clamping components are located on both sides of the U-shaped rib 3; the driving component 1 is controlled to drive the rolling component to contact the top surface of the U-shaped rib 3, and the driving component 2 is controlled to drive the two clamping components to move in the direction close to the U-shaped rib 3, until the clamping plate 51 makes the track 52 contact the side of the U-shaped rib 3; the welding mechanism is controlled to start welding; the walking wheel 21 is controlled to drive the gantry 2 to move toward the other end of the U-shaped rib 3, and the driving component 3 is controlled to drive the track 52 to rotate, so that when the clamping component follows the movement of the gantry 2, the track 52 does not slide and rub against the side of the U-shaped rib 3.

[0046] The rolling component contacts downwardly the top of the U-shaped rib 3, pressing and fixing the U-shaped rib 3 from top to bottom, and the clamping component contacts the two sides of the U-shaped rib 3, clamping and fixing the two side surfaces of the U-shaped rib 3, thereby ensuring the overall stability of the U-shaped rib 3 during welding and improving the deformation at the welding position; and because a track 52 is arranged on the periphery of the clamping plate 51 of the clamping component, when the driving component 3 drives the track 52 to rotate, the track 52 drives the clamping component to move along the side surface of the U-shaped rib 3, and when the speed at which the track 52 drives the clamping component to move along the side surface of the U-shaped rib 3 is set to be the same as the moving speed of the gantry 2, no sliding friction occurs between the track 52 and the side surface of the U-shaped rib 3, and in the process of the gantry 2 driving the welding gun 6 to continuously weld the U-shaped rib 3, while the clamping plate 51 continuously clamps the side surface of the U-shaped rib 3, no sliding friction occurs between the side surface of the U-shaped rib 3, thereby reducing the wear on the U-shaped rib 3 and ensuring the stability of the moving process of the gantry 2 and the continuity of the welding process.

[0047] like Figure 3 , Figures 5 to 8 As shown, the mounting frame 5 includes a top plate 53, a bottom plate 54 and a connecting rod 55, and the connecting rod 55 is connected between the top plate 53 and the bottom plate 54. The driving assembly 3 includes a motor 3 56, a rotating roller 1 57 and a rotating roller 2 58, and the rotating roller 1 57 and the rotating roller 2 58 are respectively rotatably connected to the front and rear ends of the clamping plate 51, and the rotating roller 1 57 and the rotating roller 2 58 are respectively against the inner side of the crawler 52. The motor 3 56 is fixedly installed on the mounting frame 5, and the output end of the motor 3 56 is fixedly connected to the transmission wheel 1 561, and the rotating roller 1 57 is fixedly connected to the transmission wheel 2 571, and the transmission wheel 1 561 and the transmission wheel 2 571 are connected by a transmission belt 59. The motor 3 56 drives the rotating roller 1 57 to rotate, and the rotating roller 1 57 drives the crawler 52 and the rotating roller 2 58 to rotate.

[0048] The mounting frame 5 is provided with a pre-shaping mechanism, which is located in front of the welding gun 6 along the forward direction of the moving frame, and is used to correct the position to be welded of the U-shaped rib 3. The pre-shaping mechanism includes a shaping roller 7 and an automatic telescopic cylinder 71 that drives the shaping roller 7 to reciprocate in the front-back direction. As an example, the automatic telescopic cylinder 71 is an electric telescopic cylinder. The automatic telescopic cylinder 71 is installed on the corresponding clamping plate 51, and the driving end of the automatic telescopic cylinder 71 is fixedly connected to the U-shaped frame 72, and the shaping roller 7 is rotatably connected to the U-shaped frame 72. The top plate 53 and the bottom plate 54 of the mounting frame 5 are respectively provided with a slide groove 531, and the U-shaped frame 72 is slidably connected to the slide groove 531 in the front-back direction. The shaping roller 7 is located in front of the clamping plate 51 along the extension direction of the U-shaped rib 3, and the shaping roller 7 abuts against the inner side of the crawler 52. When the clamping plates 51 are clamped on both sides of the U-shaped rib 3 , a deformation space is reserved between the shaping roller 7 and the side surfaces of the U-shaped rib 3 .

[0049] Since the welding position of the U-shaped rib 3 located in front of the welding position is not fixed, during the welding process of the U-shaped rib 3 by the welding gun 6, the welding position of the U-shaped rib 3 may be deformed due to the high temperature at the welding position, affecting subsequent welding.

[0050] When the deformation degree of the U-shaped rib 3 does not exceed the deformation space between the shaping roller 7 and the side of the U-shaped rib 3, then as the clamping assembly continues to move forward, the track 52, the rotating roller 58 and the clamping plate 51 cooperate to extrude and shape the deformed part to ensure the subsequent welding quality.

[0051] When the deformation degree of the U-shaped rib 3 at the welding position exceeds the deformation space, the automatic telescopic cylinder 1 71 drives the shaping roller 7 to move back and forth, and the deformed part is pre-shaped to avoid the deformation position affecting the continuity and stability of welding. When the rotating roller 2 58 and the clamping plate 51 move to the deformation position, the deformation position is squeezed and shaped again to improve the stability of the U-shaped rib 3 welding process.

[0052] Since the tightness of the crawler 52 will change during the reciprocating movement of the shaping roller 7 in the front-back direction, a tensioning mechanism for tensioning the crawler 52 is provided in the mounting frame 5 in this embodiment. The tensioning mechanism includes a tensioning roller 8 and an elastic telescopic rod 81. The tensioning roller 8 is slidably connected to the mounting frame 5 in a direction perpendicular to the side of the U-shaped rib 3. The elastic telescopic rod 81 is connected between the tensioning roller 8 and the clamping plate 51. The elastic telescopic rod 81 pushes the tensioning roller 8 to contact the inner side of the crawler 52. When the shaping roller 7 moves forward, the crawler 52 contracts the elastic telescopic rod 8 by squeezing the tensioning roller 8. When the shaping roller 7 moves backward, the elastic force of the elastic telescopic rod 81 pushes the tensioning roller 8 to move away from the clamping plate 51 to tension the crawler 52.

[0053] like Figures 6 to 8 As shown, the clamping plate 51 includes a clamping portion 511 and a pushing portion 512. The clamping portion 511 is fixedly connected to the mounting frame 5, and the clamping portion 511 is provided with a through groove (not shown in the figure) for accommodating the pushing portion 512. One end of the elastic telescopic rod 1 81 is fixedly connected to the pushing portion 512, and the other end is fixedly connected to the U-shaped frame 2 82, and the tensioning roller 8 is rotatably connected to the U-shaped frame 2 82. The top plate 53 and the bottom plate 54 of the mounting frame 5 are respectively provided with a slide groove 2 532, and the U-shaped frame 2 82 is slidably connected to the slide groove 2 532. When the shaping roller 7 moves forward, the track 52 squeezes the tensioning roller 8 to make the elastic telescopic rod 1 81 squeeze the pushing portion 512, thereby increasing the pressure between the pushing portion 512 and the U-shaped rib 3, and further shaping the side of the U-shaped rib 3 is achieved.

[0054] like Figures 2 to 4 As shown, the rolling assembly includes a rolling roller 9 and an elastic telescopic rod 2 91, the elastic telescopic rod 2 91 is arranged vertically, and the top of the elastic telescopic rod 2 91 is fixedly connected to the support frame 4, and the bottom end is fixedly connected to a U-shaped frame 3 92, and the rolling roller 9 is rotatably connected to the U-shaped frame 3 92. The driving assembly 1 includes an automatic telescopic cylinder 2 93 extending vertically, the top of the automatic telescopic cylinder 2 93 is fixedly connected to the mobile frame, and the bottom end is fixedly connected to the support frame 4. As an example, the automatic telescopic cylinder 2 93 is an electric telescopic cylinder. The automatic telescopic cylinder 2 93 drives the support frame 4 to move vertically so that the rolling roller 9 below the support frame 4 is pressed against the top surface of the U-shaped rib 3 or is out of contact with the U-shaped rib 3.

[0055] The second driving assembly includes a guide rod 41, a lead screw 42 and a second motor 43. The guide rod 41 is arranged in parallel with the lead screw 42, and the guide rod 41 is fixedly connected to the carrier frame 4, and the lead screw 42 is rotatably connected to the carrier frame 4. The second motor 43 is fixedly installed on the carrier frame 4, and the lead screw 42 is fixedly connected to the output end of the second motor 43. The lead screw 42 is provided with a thread segment with a thread rotation direction opposite to that of the thread. The mounting frame 5 is fixedly connected with a support plate 50, and the support plate 50 is slidably matched with the guide rod 41 and matched with the corresponding thread segment on the lead screw 42. The second motor 43 drives the lead screw 42 to drive the two support plates 50 to move in a direction close to or away from each other, so that the clamping assembly is clamped on both sides of the U-shaped rib 3 or the clamping of the U-shaped rib 3 is cancelled.

[0056] A steel box girder welding method of the present invention uses the steel box girder welding device in the above embodiment, and the steel box girder welding method comprises the following steps:

[0057] Lay the steel box girder top plate 10 on the platform 1, and place the U-shaped rib 3 on the steel box girder top plate 10;

[0058] Control the driving motor to drive the walking wheel 21 to move, so that the gantry 2 drives the rolling assembly and the clamping assembly to move to one end of the U-shaped rib 3, and stays at a position where the rolling assembly is located above the U-shaped rib 3 and the two clamping assemblies are located on both sides of the U-shaped rib 3;

[0059] Control the second automatic telescopic cylinder 93 to drive the carrier 4 to move downward in the vertical direction, so that the rolling roller 9 below the carrier 4 is pressed against the top surface of the U-shaped rib 3, and control the second motor 43 to drive the lead screw 42 to drive the two support plates 50 to move in a direction close to each other, so that the clamping plate 51 squeezes the crawler 52 against the corresponding side surface of the U-shaped rib 3;

[0060] Control the welding gun 6 to start welding, control the gantry 2 to continue moving, and control the motor 3 56 to drive the rotating roller 1 57 to rotate. The rotating roller 1 57 drives the track 52, the rotating roller 2 58, the shaping roller 7 and the tensioning roller 8 to rotate. During the rotation of the track 52, the clamping assembly is driven to move along the side of the U-shaped rib 3, and the moving speed of the clamping assembly is kept equal to the moving speed of the gantry 2, so that no sliding friction occurs between the track 52 and the side of the U-shaped rib 3;

[0061] During the movement of the gantry 2, the automatic telescopic cylinder 71 is controlled to drive the shaping roller 7 to reciprocate forward and backward to pre-shape the deformed part of the U-shaped rib 3. When the shaping roller 7 moves forward, the track 52 squeezes the tensioning roller 8 to make the elastic telescopic rod 81 squeeze the pushing part 512, thereby increasing the pressure between the pushing part 512 and the U-shaped rib 3, thereby achieving further shaping of the side of the U-shaped rib 3.

[0062] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A steel box girder welding device, comprising a platform, a mobile frame arranged on the platform and a welding mechanism arranged on the mobile frame, characterized in that: The mobile frame is provided with a bearing frame, and the bearing frame is provided with a rolling assembly and a driving assembly 1 for driving the rolling assembly to contact the top surface of the U-shaped rib of the steel box beam; The carrier frame is provided with two symmetrically distributed clamping assemblies and a second driving assembly for driving the clamping assemblies to contact the two sides of the U-shaped rib. The clamping assembly includes a mounting frame and a clamping plate. A crawler is arranged around the outer periphery of the clamping plate. The mounting frame is provided with a third driving assembly for driving the crawler to rotate. When the mobile frame moves along the extension direction of the U-shaped rib, the part of the crawler located on the side of the clamping plate facing the U-shaped rib contacts the side of the U-shaped rib, and the driving assembly 3 drives the crawler to rotate in accordance with the moving speed of the mobile frame, so that no sliding friction occurs between the crawler and the U-shaped rib; A pre-shaping mechanism is provided on the mounting frame, and the pre-shaping mechanism is used to correct the position of the U-shaped rib to be welded, including a shaping roller and an automatic telescopic cylinder that drives the shaping roller to reciprocate along the extension direction of the U-shaped rib, the driving end of the automatic telescopic cylinder installed on the corresponding clamping plate is fixedly connected to the U-shaped frame, the shaping roller is rotatably connected to the U-shaped frame, the shaping roller is located at the front side of the clamping plate along the extension direction of the U-shaped rib and contacts the inner side of the crawler, and when the clamping plate is clamped on both sides of the U-shaped rib, a deformation space is reserved between the shaping roller and the side surface of the U-shaped rib; A tensioning mechanism for tensioning the crawler track is arranged in the mounting frame, the tensioning mechanism comprising a tensioning roller and an elastic telescopic rod 1, the tensioning roller is slidably connected to the mounting frame in a direction perpendicular to the side surface of the U-shaped rib, the elastic telescopic rod 1 is connected between the tensioning roller and the clamping plate, and the elastic telescopic rod 1 pushes the tensioning roller to contact the inner side of the crawler track; The clamping plate includes a clamping part and a pushing part. The clamping part fixedly connected to the mounting frame is provided with a through groove for accommodating the pushing part. One end of the elastic telescopic rod is fixedly connected to the pushing part, and the other end is fixedly connected to the U-shaped frame 2. The tensioning roller is rotatably connected to the U-shaped frame 2. During the reciprocating movement of the shaping roller along the extension direction of the U-shaped rib, the tensioning roller is squeezed by the crawler so that the elastic telescopic rod intermittently squeezes the pushing part to push the side of the U-shaped rib.

2. The steel box girder welding device according to claim 1, characterized in that: The driving component three includes a motor three, a rotating roller one and a rotating roller two. The rotating roller one and the rotating roller two are respectively rotatably connected to the mounting frame, and the rotating roller one and the rotating roller two are respectively in contact with the inner side of the track. The motor three is fixedly installed on the mounting frame, and the rotating roller one is connected to the output end of the motor three. The motor three drives the rotating roller one to rotate, and the rotating roller one drives the track and the rotating roller two to rotate.

3. The steel box girder welding device according to claim 2, characterized in that: The welding mechanism comprises two welding guns symmetrically arranged on both sides of the U-shaped rib, the two welding guns are mounted on the mounting frame, and the pre-shaping mechanism is located in front of the welding guns along the forward direction of the moving frame.

4. The steel box girder welding device according to claim 1, characterized in that: The rolling assembly includes a rolling roller and two elastic telescopic rods, the two elastic telescopic rods are arranged vertically, and the top end of the two elastic telescopic rods is fixedly connected to the supporting frame, and the bottom end is fixedly connected to a U-shaped frame three, and the rolling roller is rotatably connected to the U-shaped frame three.

5. The steel box girder welding device according to claim 1, characterized in that: The driving assembly 1 includes an automatic telescopic cylinder 2 extending vertically, wherein the top end of the automatic telescopic cylinder 2 is fixedly connected to the movable frame, and the bottom end of the automatic telescopic cylinder 2 is fixedly connected to the supporting frame.

6. The steel box girder welding device according to claim 1, characterized in that: The second driving component includes a guide rod, a lead screw and a second motor. The guide rod is arranged parallel to the lead screw and is fixedly connected to the support frame. The lead screw is rotatably connected to the support frame. The second motor is fixedly installed on the support frame. The lead screw is fixedly connected to the output end of the second motor. The lead screw is provided with thread segments with opposite thread rotation directions. The mounting frame is fixedly connected with a support plate. The support plate is slidably matched with the guide rod and matched with the corresponding thread segment on the lead screw. The second motor drives the lead screw to drive the two support plates to move towards or away from each other.

7. A steel box girder welding method, characterized in that: The steel box girder welding method uses the steel box girder welding device according to any one of claims 1 to 6, and the steel box girder welding method comprises the following steps: Laying the steel box girder top plate on the platform, and placing the U-shaped rib on the steel box girder top plate; Controlling the movable frame to move until the rolling assembly is located above the U-shaped rib and the two clamping assemblies are located on both sides of the U-shaped rib; Control the driving component 1 to drive the rolling component to contact the top surface of the U-shaped rib, and control the driving component 2 to drive the two clamping components to move toward the U-shaped rib until the clamping plate causes the crawler to contact the side surface of the U-shaped rib; The welding mechanism is controlled to start welding, the movable frame is controlled to move along the extension direction of the U-shaped rib, and the driving component three is controlled to drive the track to rotate at the same time, so that the track does not have sliding friction with the side surface of the U-shaped rib while following the movement of the movable frame.

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