Steel box girder U rib plate unit spot welding equipment and control method

Abstract

The invention provides steel box girder U rib plate unit spot welding equipment and a control method thereof, and belongs to the field of welding. The spot welding equipment comprises a rack, a portal frame, one or more pressing devices and one or more welding devices, wherein the rack is used for bearing a bottom plate and a U-shaped rib; the portal frame comprises a beam which is perpendicular to the length direction of the U rib and moves in the length direction of the U rib relative to the U rib. The pressing device is connected with the cross beam and comprises a pressing claw lifting mechanism and a U-shaped rib pressing claw, the pressing claw lifting mechanism is used for lifting the U-shaped rib pressing claw, and the U-shaped rib pressing claw is used for pressing the U-shaped rib; the welding device is connected with the cross beam and comprises a welding gun lifting mechanism, a welding gun adjusting assembly and a welding gun which are sequentially connected, the welding gun lifting mechanism drives the welding gun adjusting assembly to ascend and descend, and the welding gun adjusting assembly drives the welding gun to be aligned with the welding seam. According to the spot welding equipment, the welding device and the pressing device synchronously move along with the cross beam, spot welding is conducted after pressing is conducted on the U rib, and the high-quality positioning spot welding effect is obtained.

Description

Technical Field

[0001] This invention belongs to the field of welding, specifically relating to a spot welding device and control method for U-rib plate units of steel box girders. Background Technology

[0002] A steel box girder is a closed box-shaped beam structure formed by welding or bolting steel plates. As the core load-bearing component of the bridge superstructure, it is responsible for transferring vehicle loads, pedestrian loads, and its own weight to the substructure such as piers and abutments. It is widely used in various large-span and special bridge projects.

[0003] U-rib plate units are important components used to enhance the strength of steel box girders. A U-rib plate unit generally consists of a base plate and multiple U-ribs, which are fixed to the base plate by welding to obtain a U-rib plate unit with greater strength.

[0004] In the process of welding the U-ribs to the base plate surface, the U-ribs need to be fixed to the base plate, and then the weld between the U-ribs and the base plate is welded using a welding torch. This welding work is generally done manually, which is inefficient and results in inconsistent weld quality. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to provide a spot welding device for U-rib plate units of steel box girders, comprising: The support frame is used to support the base plate and U-ribs; A gantry frame includes a crossbeam perpendicular to the length direction of the U-rib, and the crossbeam moves relative to the U-rib along the length direction of the U-rib; One or more clamping devices, the clamping devices being connected to the crossbeam, the clamping devices including a clamping claw lifting mechanism and a U-rib clamping claw, the clamping claw lifting mechanism being used to lift the U-rib clamping claw, the U-rib clamping claw being used to clamp the U-rib; One or more welding devices are connected to the crossbeam. Each welding device includes a welding torch lifting mechanism, a welding torch adjusting assembly, and a welding torch connected in sequence. The welding torch lifting mechanism is used to drive the welding torch adjusting assembly to lift and lower, and the welding torch adjusting assembly is used to drive the welding torch to align with the weld.

[0006] In some embodiments, the gantry crane further includes a traveling mechanism, the traveling mechanism comprising: The travel track is provided on the side of the platform and extends along the length of the U-rib; The traveling arm is connected to the crossbeam, and the traveling arm drives the crossbeam to travel along the traveling track.

[0007] In some embodiments, the walking mechanism further includes a limiting member disposed on the walking arm, the limiting member extending from the walking arm to below the platform.

[0008] In some embodiments, the spot welding equipment for the U-rib plate unit of the steel box girder has the following features: In the compressed state, the pressing device presses the U-rib against the base plate; In the released state, the clamping device disengages from the U-rib; If the spot welding equipment for the U-rib plate unit of the steel box girder is in a compressed state, the limiting member abuts against the platform; If the spot welding equipment for the U-rib plate unit of the steel box girder is in the released state, then the limiting member is spaced apart from the platform.

[0009] In some embodiments, the limiting member includes a limiting block and a mounting base that are fixedly connected. The limiting block is used to abut against the platform. The mounting base has a strip-shaped hole in the vertical direction. The mounting base is screwed to the traveling arm through the strip-shaped hole. The mounting base adjusts its position in the vertical direction through the strip-shaped hole.

[0010] In some embodiments, the welding apparatus further includes a welding apparatus lateral travel mechanism, which drives the welding apparatus to travel along the length of the crossbeam.

[0011] In some embodiments, the lateral travel mechanism of the welding device includes a lateral drive motor for the welding device and a lateral slider for the welding device, wherein the lateral drive motor for the welding device includes an output shaft having gears; The crossbeam is provided with a welding device transverse traveling rack and a welding device transverse traveling slide rail along its own length direction. The welding device transverse traveling slider slides in cooperation with the welding device transverse traveling slide rail. The welding device transverse drive motor drives the welding device to move along the length direction of the crossbeam through its own output shaft in cooperation with the welding device transverse traveling rack.

[0012] In some embodiments, the crossbeam includes a top surface and a side surface; The transverse traveling rack of the welding device is disposed on the upper surface of the crossbeam; The welding device's transverse travel slide rail includes a first transverse travel slide rail and a second transverse travel slide rail, which are spaced apart on the side of the crossbeam. The lateral movement slider of the welding device includes a first lateral movement slider and a second lateral movement slider of the welding device. The first transverse sliding block of the welding device slides in cooperation with the first transverse sliding rail of the welding device, and the second transverse sliding block of the welding device slides in cooperation with the second transverse sliding rail of the welding device.

[0013] In some embodiments, the spot welding equipment further includes a welding wire supply mechanism for supplying welding wire to the welding torch.

[0014] The present invention also proposes a control method for a spot welding device for U-rib plate units of steel box girders according to any embodiment of the present disclosure, including: S1: Control the crossbeam to move along the length of the U-rib so that the clamping device is aligned with the welding position of the U-rib; S2: Control the lifting mechanism of the pressure claw to drive the U-rib pressure claw to descend, so as to press the U-rib tightly against the base plate; S3: Control the welding torch lifting mechanism to drive the welding torch adjusting assembly to descend, so that the welding torch reaches a height where it can weld the weld seam; S4: Control the welding torch adjustment assembly to drive the welding torch to align with the weld seam, and control the welding torch to weld the weld seam; S5: After welding is completed, control the welding torch lifting mechanism to drive the welding torch adjusting component to rise, and control the pressure claw lifting mechanism to drive the U-rib pressure claw to rise; S6: Control the crossbeam to move along the length of the U-rib to the next welding position, repeat the pressing and welding operations until the U-rib welding is completed.

[0015] Beneficial effects: 1. The steel box girder U-rib plate unit spot welding equipment provided by this invention features a clamping device and a welding device on a crossbeam that can move relative to the length of the U-rib. After the clamping device presses the U-rib onto the base plate, the welding device directly welds the U-rib onto the base plate, eliminating the need for manual welding and improving welding efficiency. Furthermore, both the welding device and the clamping device are located on the crossbeam of the gantry frame. Along the length of the U-rib, the welding device always follows the clamping device on the same crossbeam, achieving a "follow-up welding" effect. This eliminates the need for a separate drive device for the welding device and facilitates relative positioning between the welding device and the clamping device, enabling precise welding of the clamped portion of the U-rib and improving weld quality.

[0016] 2. The steel box girder U-rib plate unit spot welding equipment provided by the present invention uses a clamping device set on the gantry beam to press the U-rib to the bottom plate, and then uses a welding device also set on the gantry beam to spot weld the pressed position of the U-rib, thereby achieving the effect of "follow-up spot welding", without the need for manual operation of the welding gun, and without the need for relative positioning of the welding device and the clamping device. Attached Figure Description

[0017] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0018] Figure 1 This is a three-dimensional structural diagram of the spot welding equipment for the U-rib plate unit of the steel box girder according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the three-dimensional structure of the gantry frame according to an embodiment of the present invention; Figure 3 This is a three-dimensional structural schematic diagram of the gantry frame from another perspective according to an embodiment of the present invention; Figure 4 This is a three-dimensional structural schematic diagram of the gantry frame from another perspective in an embodiment of the present invention; Figure 5 for Figure 4 Enlarged view of point A in the middle.

[0019] Figure label: 1. Platform; 2. Crossbeam; 21. Traveling track; 22. Traveling arm; 23. Limiting component; 231. Limiting block; 232. Mounting base; 232a. Strip hole; 24. Welding device transverse traveling rack; 25. Welding device transverse traveling slide rail; 251. Welding device first transverse traveling slide rail; 252. Welding device second transverse traveling slide rail; 3. Clamping device; 31. Clamping claw lifting mechanism; 32. U-rib clamping claw; 4. Welding device; 41. Welding torch; 42. Welding torch adjustment assembly; 43. Welding device transverse drive motor; 44. Welding device transverse traveling slider; 441. Welding device first transverse traveling slider; 442. Welding device second transverse traveling slider. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. The principles and features of the present invention are described below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other. The embodiments given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0021] A steel box girder is a closed box-shaped beam structure formed by welding or bolting steel plates. As the core load-bearing component of the bridge superstructure, it is responsible for transferring vehicle loads, pedestrian loads, and its own weight to the substructure such as piers and abutments. It is widely used in various large-span and special bridge projects.

[0022] U-rib plate units are important components used to enhance the strength of steel box girders. A U-rib plate unit generally consists of a base plate and multiple U-ribs, which are fixed to the base plate by welding to obtain a U-rib plate unit with greater strength.

[0023] The process of welding U-ribs to the bottom plate can be divided into spot welding and full welding. Spot welding can also be called positioning welding, and full welding can also be called continuous welding.

[0024] When welding the U-rib and the base plate, the weld along the length of the U-rib undergoes two stages: heating and cooling. This process causes significant stress deformation in the U-rib, leading to bending and affecting the quality of the weld and the U-rib plate unit. Therefore, it is generally necessary to first perform tack welding on the U-rib and the base plate to initially fix them. Tack welding only requires localized welding, with less and discontinuous heat, and will not cause deformation of the U-rib (or the deformation is minimal), thus improving the welding quality of the U-rib.

[0025] This disclosure proposes a spot welding device for U-rib plate units of steel box girders. Figure 1 This is a three-dimensional structural diagram of the spot welding equipment for the U-rib plate unit of the steel box girder according to an embodiment of the present invention. Figure 2 This is a schematic diagram of the three-dimensional structure of the gantry frame according to an embodiment of the present invention. Figure 3 This is a three-dimensional structural diagram of the gantry frame from another perspective according to an embodiment of the present invention. Figure 4 This is a three-dimensional structural schematic diagram of the gantry frame from another perspective according to an embodiment of the present invention, as shown below. Figures 1 to 4 As shown, the steel box girder U-rib plate unit spot welding equipment disclosed herein includes a platform 1, a gantry frame, a clamping device 3, and a welding device 4. The platform 1 supports the base plate and the U-rib. The gantry frame includes a crossbeam 2, which is perpendicular to the length direction of the U-rib and moves relative to the U-rib along its length. The clamping device 3 is connected to the crossbeam 2 and includes a claw lifting mechanism 31 and a U-rib claw 32. The claw lifting mechanism 31 is used to lift the U-rib claw 32, and the U-rib claw 32 is used to clamp the U-rib. The welding device 4 is connected to the crossbeam 2 and includes a welding torch lifting mechanism, a welding torch adjusting assembly 42, and a welding torch 41 connected in sequence. The welding torch lifting mechanism drives the welding torch adjusting assembly 42 to lift, and the welding torch adjusting assembly 42 drives the welding torch 41 to move and align with the weld seam.

[0026] In the embodiments of this disclosure, the clamping device 3 and the welding device 4 are mounted together on the crossbeam 2 of the gantry frame. When spot welding the U-rib and the base plate, the gantry frame moves relative to the U-rib to the spot welding position. The clamping claw lifting mechanism 31 of the clamping device 3 drives the U-rib clamping claw 32 to press the U-rib firmly against the base plate. The welding gun adjustment assembly 42 of the welding device 4 drives the welding gun 41 to spot weld the U-rib and the base plate at the spot welding position. Thanks to the fact that the welding device 4 and the clamping device 3 are both mounted on the crossbeam 2 of the gantry frame and move synchronously, on the one hand, there is no need to set up other driving mechanisms to drive the welding device 4 to follow the clamping device 3, and on the other hand, the welding device 4 and the clamping device 3 can be kept synchronized to achieve the effect of "follow-up spot welding".

[0027] In some embodiments of this disclosure, "the crossbeam 2 moves relative to the U-rib along the length of the U-rib" means that the crossbeam 2 can be movable, while the platform 1, the U-rib, and the base plate are fixed. Alternatively, the crossbeam 2 can be fixed, while the base plate and the U-rib can be movable. Or, the crossbeam 2, the U-rib, and the base plate are all movable.

[0028] In some embodiments of this disclosure, the movement of the U-rib and the base plate can be achieved by moving the platform 1 to drive the base plate to move, or by setting a special conveying device in the platform 1 to convey the base plate and the U-rib while the platform 1 is fixed.

[0029] In some embodiments of this disclosure, the pressure claw lifting mechanism 31 may include a cylinder to drive the lifting and lowering of the U-rib pressure claw 32 by extending and retracting the cylinder. In some embodiments, the pressure claw lifting mechanism 31 may also include a hydraulic cylinder.

[0030] In some embodiments of this disclosure, such as Figure 2 , Figure 3 and Figure 4 As shown, the spot welding equipment may include one welding device 4 or multiple welding devices 4.

[0031] In some embodiments of this disclosure, such as Figure 2 , Figure 3 and Figure 4 As shown, the spot welding equipment may include one clamping device 3 or multiple clamping devices 3.

[0032] In some embodiments of this disclosure, the stand 1 includes a first end and a second end, and the spot welding device moves from the first end of the stand 1 to the second end for welding. The clamping device 3 is disposed on the side of the crossbeam 2 facing the first end of the stand 1, and the welding device 4 is disposed on the side of the crossbeam 2 facing the second end of the stand 1.

[0033] In the embodiments of this disclosure, the spot welding equipment welds from the first end to the second end of the stand 1. That is, the portion of the U-rib on the side of the crossbeam 2 facing the first end of the stand 1 has been spot welded and is thus fixed to the base plate. The welding device 4 is positioned between the clamping device 3 and the first end of the stand 1. One end of the part to be welded on the welding device 4 has been spot welded and positioned, and the other end has been clamped and positioned by the clamping device 3. Neither end will move, resulting in more accurate positioning of the part to be welded and a lower possibility of deformation, which is beneficial to improving the welding positioning quality of the U-rib plate unit.

[0034] In some embodiments of this disclosure, the welding torch lifting mechanism of the welding apparatus 4 drives the welding torch adjusting assembly 42 to move up and down in the vertical direction. The welding torch lifting mechanism may include a cylinder, and the lifting and lowering of the welding torch adjusting assembly is driven by the extension and retraction of the cylinder piston relative to the cylinder body. Of course, the cylinder can also be replaced by a hydraulic cylinder, etc.

[0035] In some embodiments of this disclosure, such as Figures 1 to 4 As shown, the gantry also includes a traveling mechanism, which includes a traveling track 21 and a traveling arm 22. The traveling track 21 is located on the side of the platform 1 and extends along the length of the U-rib; the traveling arm 22 is connected to the crossbeam 2 and drives the crossbeam 2 to travel along the traveling track 21.

[0036] In some embodiments of this disclosure, the gantry is provided with a traveling mechanism to drive the crossbeam 2 to move along the length of the U-rib in order to achieve spot welding of the U-rib along the length of the U-rib.

[0037] In some embodiments of this disclosure, the traveling arm 22 of the gantry can achieve movement through various structures. For example, the traveling arm 22 of the gantry can include motor-driven rollers to move along the traveling track 21 by rotating the motor-driven rollers. Another example is that a rack and pinion structure is provided on the traveling track 21, and a motor-driven gear structure is provided on the traveling arm 22, achieving movement through the rack and pinion structure.

[0038] In some embodiments of this disclosure, such as Figures 1 to 4 As shown, the steel box girder U-rib plate unit spot welding equipment includes two traveling arms 22, which are respectively set on both sides of the crossbeam 2 to provide stable support for the crossbeam 2. The steel box girder U-rib plate unit spot welding equipment also includes two traveling tracks 21, which are respectively set on both sides of the platform 1 to allow the two traveling arms 22 to travel.

[0039] Figure 5 for Figure 4 An enlarged view of point A in the middle, as shown in some embodiments of this disclosure, such as... Figures 2 to 5 As shown, the walking mechanism also includes a limiting member 23 disposed on the walking arm 22, which extends from the walking arm 22 to the bottom of the platform 1.

[0040] In the embodiments of this disclosure, after the pressing claw lifting mechanism 31 of the pressing device 3 drives the U-rib pressing claw 32 to press the U-rib, the crossbeam 2 and the traveling arm 22 of the gantry frame may be lifted under the reaction force of the pressing claw lifting mechanism 31. A limiting member 23 extending to the bottom of the platform 1 is provided on the traveling arm 22 to limit the lifting height of the crossbeam 2 and the traveling arm 22, so as to avoid the traveling arm 22 and the crossbeam 2 from overturning due to excessive lifting height.

[0041] In some embodiments of this disclosure, such as Figure 4 and Figure 5 As shown, each traveling arm 22 can be equipped with multiple limiting members 23 to change the fixation between the traveling arm 22 and the platform 1 from a single point to a multi-point fixation, thereby improving the stability of the fixation. Furthermore, it also disperses the force, reducing the force on individual limiting members and preventing damage to them.

[0042] In some embodiments of this disclosure, the steel box girder U-rib plate unit spot welding equipment has a clamping state and a releasing state. The clamping state refers to the clamping device 3 pressing the U-rib against the base plate, and the releasing state refers to the clamping device 3 disengaging from the U-rib. If the steel box girder U-rib plate unit spot welding equipment is in the clamping state, the limiting member 23 abuts against the platform 1; if the steel box girder U-rib plate unit spot welding equipment is in the releasing state, the limiting member 23 is spaced apart from the platform 1.

[0043] In the embodiments of this disclosure, the limiting member 23 and the platform 1 have different relative positions in the clamped and released states. When the spot welding equipment is in the released state, the limiting member 23 is spaced apart from the platform 1, which can prevent the limiting member 23 from obstructing the movement of the traveling arm 22 along the traveling track 21. When the spot welding equipment is in the clamped state, the traveling arm 22 is lifted under the reaction force of the pressure claw lifting mechanism 31, and the limiting member 23 abuts against the platform 1, limiting the lifting range of the traveling arm 22, thereby preventing the traveling arm 22 and the crossbeam 2 from overturning.

[0044] In some embodiments of this disclosure, the limiting member 23 may be cylindrical and can rotate about its own axis. With this configuration, even if the limiting member 23 abuts against the platform 1, it can still move along the platform 1 through its own rotation. When the spot welding equipment is in the released state, the limiting member 23 does not need to be spaced from the platform 1. When the reaction force of the pressure claw lifting mechanism 31 lifts the crossbeam 2 and the traveling arm 22, the lifting amplitude of the traveling arm 22 is negligible, which can improve the posture stability of the gantry.

[0045] In some embodiments of this disclosure, such as Figure 5 As shown, the limiting member 23 includes a limiting block 231 and a mounting base 232 that are fixedly connected. The limiting block 231 is used to abut against the frame 1. The mounting base 232 has a strip hole 232a in the vertical direction. The mounting base 232 is screwed to the traveling arm 22 through the strip hole 232a. The mounting base 232 adjusts its position in the vertical direction through the strip hole 232a.

[0046] In some embodiments of this disclosure, a strip-shaped hole 232a is provided on the mounting base 232 of the limiting member 23 to adjust the vertical height of the limiting block 231, thereby adjusting the relative position between the limiting block 231 and the platform 1. Based on this structure, the operator can continue to adjust the position of the limiting block 231 according to actual needs, ensuring the stability of the crossbeam 2 and the traveling arm 22 in the pressed state, and ensuring the smooth movement of the traveling arm 22 in the released state.

[0047] In some embodiments of this disclosure, such as Figure 5As shown, "mounting base 232 is screwed to travel arm 22 through strip hole 232a" means that a bolt is inserted into strip hole 232a and the bolt is fastened to travel arm 22 or nut on travel arm 22 by thread.

[0048] In some embodiments of this disclosure, the welding device 4 further includes a welding device lateral travel module, which drives the welding device 4 to travel along the length of the crossbeam 2.

[0049] In the embodiments of this disclosure, the lateral travel module of the welding device can drive the welding device 4 to the position corresponding to the U-rib, thereby welding the U-rib. Furthermore, the lateral travel module can also drive the welding device 4 to positions corresponding to different U-ribs, thus enabling the use of one welding device 4 to weld multiple U-ribs, reducing the number of welding devices 4 required. This reduces costs and simplifies the structure, and also solves the problem of the large size of the welding device 4, making it impossible to dedicate a welding device 4 to each U-rib.

[0050] In some embodiments of this disclosure, such as Figure 3 and Figure 4 As shown, the lateral travel module of the welding device includes a lateral drive motor 43 and a lateral travel slider 44. The drive motor of the welding device 4 includes an output shaft with gears. The crossbeam 2 is provided with a lateral travel rack 24 and a lateral travel slide rail 25 along its own length. The lateral travel slider 44 and the lateral travel slide rail 25 cooperate to slide. The lateral drive motor 43 drives the welding device 4 to move along the length of the crossbeam 2 through its own output shaft in cooperation with the lateral travel rack 24.

[0051] In the embodiments of this disclosure, the lateral drive motor 43 and the lateral travel rack 24 of the welding device cooperate to achieve the lateral drive of the welding device 4, making the drive form of the gear and rack structure more accurate and stable. Furthermore, the lateral travel slider 44 and the lateral travel slide rail 25 of the welding device can guide the gear and rack structure, making the movement of the welding device 4 more stable.

[0052] In some embodiments of this disclosure, the transverse sliding block 44 of the welding device is a dovetail-shaped slider, and the transverse sliding rail 25 of the welding device is a dovetail-shaped rail. The two cooperate with each other to prevent the transverse sliding block 44 of the welding device from falling off the transverse sliding rail 25 of the welding device, thereby improving the stability of the connection between the welding device 4 and the crossbeam 2.

[0053] In some embodiments of this disclosure, such as Figure 3 and Figure 4As shown, the crossbeam 2 includes an upper surface and a side surface. The transverse traveling rack 24 of the welding device is disposed on the upper surface of the crossbeam 2. The transverse traveling slide rail 25 of the welding device includes a first transverse traveling slide rail 251 and a second transverse traveling slide rail 252 of the welding device. The first transverse traveling slide rail 251 and the second transverse traveling slide rail 252 of the welding device are spaced apart on the side surface of the crossbeam 2. The transverse traveling slider 44 of the welding device includes a first transverse traveling slider 441 and a second transverse traveling slider 442 of the welding device. The first transverse traveling slider 441 of the welding device slides in cooperation with the first transverse traveling slide rail 251 of the welding device, and the second transverse traveling slider 442 of the welding device slides in cooperation with the second transverse traveling slide rail 252 of the welding device.

[0054] In the embodiments of this disclosure, two sets of slide rail slider structures (i.e., the first transverse sliding slider 441 of the welding device and the first transverse sliding rail 251 of the welding device, and the second transverse sliding slider 442 of the welding device and the second transverse sliding rail 252 of the welding device) are provided on the side of the crossbeam 2, which can make the fixing of the welding device 4 more stable. Since the welding device 4 needs to precisely weld the weld seam between the U-rib and the base plate, the stable connection between the welding device 4 and the crossbeam 2 can effectively improve the welding accuracy and welding quality of the welding device 4.

[0055] In some embodiments of this disclosure, the spot welding equipment further includes a welding wire supply mechanism for supplying welding wire to the welding torch 41.

[0056] In some embodiments of this disclosure, a welding wire supply mechanism is provided in the welding apparatus 4, which can improve the independent operation capability of the welding apparatus 4, while reducing the welding wire conveying distance and improving work efficiency.

[0057] In some embodiments of this disclosure, the welding wire is stored in a welding wire supply device.

[0058] In some embodiments of this disclosure, a welding wire supply mechanism may be provided in each welding device 4, or multiple welding devices 4 may share a single welding wire supply mechanism.

[0059] In the embodiments of this disclosure, the spot welding equipment also includes components such as a power supply system that support the normal operation of the spot welding equipment, which will not be described in detail here.

[0060] This disclosure also proposes a control method for a spot welding device for U-rib plates of steel box girders, using the spot welding device of any embodiment of this disclosure. The control method includes: S1: Control the crossbeam to move along the length of the U-rib so that the welding position of the clamping device is aligned with that of the U-rib; S2: Control the lifting mechanism of the pressure claw to drive the U-rib pressure claw to descend, so as to press the U-rib tightly against the base plate; S3: Control the welding torch lifting mechanism to drive the welding torch adjustment component to descend so that the welding torch reaches a height where it can weld the weld seam; S4: Control the welding torch adjustment component to drive the welding torch to align with the weld seam and control the welding torch to weld the weld seam; S5: After welding is completed, control the welding torch lifting mechanism to drive the welding torch adjustment component to rise, and control the pressure claw lifting mechanism to drive the U-rib pressure claw to rise. S6: Control the crossbeam to move along the length of the U-rib to the next welding position, repeat the pressing and welding operations until the U-rib welding is completed.

[0061] In the embodiments of this disclosure, in step S1, the crossbeam is driven to the spot welding position of the U-rib; in step S2, the pressure claw lifting mechanism 31 is controlled to drive the U-rib pressure claw 32 to press the U-rib firmly; and in step S4, the welding torch adjustment assembly 42 is controlled to drive the welding torch 41 to weld the weld between the U-rib and the base plate. The welding device 4 and the pressing device 3 move together with the crossbeam 2, achieving a follow-up effect between the welding device 4 and the pressing device 3. The welding device 4 and the pressing device 3 do not need to be repositioned; they can be directly pressed and spot welded at the spot welding position to be welded.

[0062] In some embodiments of this disclosure, in order to position the U-rib, it is necessary to perform multiple spot welding on a U-rib along its length. The welding device 4 and the clamping device 3 are all set on the crossbeam 2. During the process of the crossbeam 2 moving from one end of the platform 1 to the other end, all the multiple spot welding positions on the U-rib can be completed without repeated movement.

[0063] In some embodiments of this disclosure, spot welding can be performed by welding torch 41 welding the U-rib and the base plate at a single point, or by welding torch 41 welding a short distance (e.g., 2 to 5 centimeters) along the weld seam. As one implementation, welding torch adjustment assembly 42 can drive welding torch 41 to move along the length of the U-rib to perform welding of a certain length.

[0064] In some embodiments of this disclosure, the welding device 4 may include two welding torches 41, which weld the two sides of the same U-rib respectively. This can improve welding efficiency and welding consistency on both sides of the U-rib, and avoid thermal deformation caused by the two sides of the U-rib not being welded at the same time.

[0065] In some embodiments of this disclosure, the welding torch adjustment assembly 42 may include a cylinder assembly for driving the welding torch 41 to move the welding torch 41 at least along the length of the U-rib. Of course, the cylinder assembly may also be replaced with a hydraulic cylinder assembly.

[0066] In some embodiments of this disclosure, the welding apparatus 4 further includes a detection module for detecting the weld position between the U-rib and the base plate and whether the weld is qualified (e.g., whether the distance between the U-rib and the base plate is less than a specified index). The welding torch adjustment assembly 42 drives the welding torch 41 based on the detection results of the detection module, so that the welding torch 41 can accurately weld the weld. As one embodiment, the detection module may include a laser displacement sensor, which is used to detect the weld between the U-rib and the base plate.

[0067] In some embodiments of this disclosure, the clamping device 3 includes a lateral travel module for the clamping device, which drives the clamping device 3 to travel along the length direction of the U-rib. Step S2 above includes: S21: The control clamping device lateral travel module drives the clamping device 3 to move laterally to the position corresponding to the U-rib to be welded; S22: Control the lifting mechanism 31 of the pressure claw to drive the U-rib pressure claw 32 to descend so as to press the U-rib to be welded against the base plate.

[0068] In the embodiments of this disclosure, before pressing the U-ribs, the position of the pressing device 3 is adjusted laterally, and the position can be switched between different U-ribs. The same pressing device 3 can be used to press multiple U-ribs. Fine adjustments can also be made so that the U-rib pressing claw 32 corresponds precisely to the U-rib.

[0069] In some embodiments of this disclosure, the "position corresponding to the U-rib" in step S21 can be above the U-rib.

[0070] In some embodiments of this disclosure, steps S1 and S21 may be interchanged.

[0071] In some embodiments of this disclosure, the lateral travel module of the pressing device includes a lateral drive motor for the pressing device and a lateral travel rack for the pressing device disposed on the crossbeam 2. The output shaft of the lateral drive motor for the pressing device is provided with a gear to cooperate with the lateral travel rack for the pressing device to realize the lateral travel of the pressing device 3.

[0072] In some embodiments of this disclosure, the welding apparatus 4 further includes a lateral travel module, which drives the welding apparatus 4 to travel along the length of the crossbeam 2. Step S3 includes: S31: The control module for the lateral movement of the welding device drives the welding device 4 to move laterally to a position opposite to the U-rib to be welded; S32: Control the welding torch lifting mechanism to drive the welding torch adjustment assembly to descend so that the welding torch reaches a height where it can weld the weld seam.

[0073] In an embodiment of this disclosure, before welding, the position of the welding device 4 is adjusted in step S31 so that the welding device 4 can weld different U-ribs as needed.

[0074] In some embodiments of this disclosure, after the crossbeam 2 moves once, the welding device 4 can weld multiple U-ribs by moving laterally.

[0075] In some embodiments of this disclosure, the spot welding equipment includes a plurality of welding devices 4 and a plurality of clamping devices 3. As one implementation, the number of welding devices 4 is less than the number of clamping devices 3 (for example, the spot welding equipment includes 2 welding devices 4 and 6 clamping devices 3). Through step S31, the welding work can be completed with a smaller number of welding devices 4 and a larger number of clamping devices 3.

[0076] In some embodiments of this disclosure, the lateral travel module of the welding device may include a lateral drive motor 43 of the welding device and a lateral travel rack 24 of the welding device disposed on the crossbeam 2. The output shaft of the lateral drive motor 43 of the welding device is provided with a gear to cooperate with the lateral travel rack 24 of the welding device to drive the welding device 4 to move along the crossbeam 2.

[0077] In some embodiments of this disclosure, the control method further includes: Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

[0078] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0079] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0080] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0081] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0082] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A spot welding device for U-rib plates of steel box girders, characterized in that, include: The support frame is used to support the base plate and U-ribs; A gantry frame includes a crossbeam perpendicular to the length direction of the U-rib, and the crossbeam moves relative to the U-rib along the length direction of the U-rib; One or more clamping devices, the clamping devices being connected to the crossbeam, the clamping devices including a clamping claw lifting mechanism and a U-rib clamping claw, the clamping claw lifting mechanism being used to lift the U-rib clamping claw, the U-rib clamping claw being used to clamp the U-rib; One or more welding devices are connected to the crossbeam. Each welding device includes a welding torch lifting mechanism, a welding torch adjusting assembly, and a welding torch connected in sequence. The welding torch lifting mechanism is used to drive the welding torch adjusting assembly to lift and lower, and the welding torch adjusting assembly is used to drive the welding torch to align with the weld.

2. The spot welding equipment for U-rib plates of steel box girders according to claim 1, characterized in that, The gantry crane also includes a traveling mechanism, which comprises: The travel track is provided on the side of the platform and extends along the length of the U-rib; The traveling arm is connected to the crossbeam, and the traveling arm drives the crossbeam to travel along the traveling track.

3. The spot welding equipment for U-rib plates of steel box girders according to claim 2, characterized in that, The walking mechanism also includes a limiting member disposed on the walking arm, the limiting member extending from the walking arm to below the platform.

4. The spot welding equipment for U-rib plates of steel box girders according to claim 3, characterized in that, The spot welding equipment for the U-rib plate unit of the steel box girder has the following features: In the compressed state, the pressing device presses the U-rib against the base plate; In the released state, the clamping device disengages from the U-rib; If the spot welding equipment for the U-rib plate unit of the steel box girder is in a compressed state, the limiting member abuts against the platform; If the spot welding equipment for the U-rib plate unit of the steel box girder is in the released state, then the limiting member is spaced apart from the platform.

5. The spot welding equipment for U-rib plates of steel box girders according to claim 3, characterized in that, The limiting component includes a limiting block and a mounting base that are fixedly connected. The limiting block is used to abut against the platform. The mounting base has a strip-shaped hole in the vertical direction. The mounting base is screwed to the traveling arm through the strip-shaped hole. The mounting base adjusts its position in the vertical direction through the strip-shaped hole.

6. The spot welding equipment for U-rib plates of steel box girders according to claim 1, characterized in that, The welding device also includes a lateral travel mechanism, which drives the welding device to travel along the length of the beam.

7. The spot welding equipment for U-rib plates of steel box girders according to claim 6, characterized in that, The lateral travel mechanism of the welding device includes a lateral drive motor for the welding device and a lateral slider for the welding device. The lateral drive motor for the welding device includes an output shaft with gears. The crossbeam is provided with a welding device transverse traveling rack and a welding device transverse traveling slide rail along its own length direction. The welding device transverse traveling slider slides in cooperation with the welding device transverse traveling slide rail. The welding device transverse drive motor drives the welding device to move along the length direction of the crossbeam through its own output shaft in cooperation with the welding device transverse traveling rack.

8. The spot welding equipment for U-rib plates of steel box girders according to claim 7, characterized in that, The crossbeam includes a top surface and side surfaces; The transverse traveling rack of the welding device is disposed on the upper surface of the crossbeam; The welding device's transverse travel slide rail includes a first transverse travel slide rail and a second transverse travel slide rail, which are spaced apart on the side of the crossbeam. The lateral movement slider of the welding device includes a first lateral movement slider and a second lateral movement slider of the welding device. The first transverse sliding block of the welding device slides in cooperation with the first transverse sliding rail of the welding device, and the second transverse sliding block of the welding device slides in cooperation with the second transverse sliding rail of the welding device.

9. The spot welding equipment for U-rib plates of steel box girders according to claim 1, characterized in that, The spot welding equipment also includes a welding wire supply mechanism, which is used to supply welding wire to the welding gun.

10. A control method for a spot welding device for U-rib plates of steel box girders as described in any one of claims 1-9, characterized in that, The control method includes: S1: Control the crossbeam to move along the length of the U-rib so that the clamping device is aligned with the welding position of the U-rib; S2: Control the lifting mechanism of the pressure claw to drive the U-rib pressure claw to descend, so as to press the U-rib tightly against the base plate; S3: Control the welding torch lifting mechanism to drive the welding torch adjusting assembly to descend, so that the welding torch reaches a height where it can weld the weld seam; S4: Control the welding torch adjustment assembly to drive the welding torch to align with the weld seam, and control the welding torch to weld the weld seam; S5: After welding is completed, control the welding torch lifting mechanism to drive the welding torch adjusting component to rise, and control the pressure claw lifting mechanism to drive the U-rib pressure claw to rise; S6: Control the crossbeam to move along the length of the U-rib to the next welding position, repeat the pressing and welding operations until the U-rib welding is completed.

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