U rib plate welding device and welding method for bridge

Abstract

The invention relates to a U-rib plate welding device and method for a bridge, and belongs to the technical field of welding. A workbench is arranged at a welding station and used for mounting a bridge floor steel plate; the positioning assembly is connected between the bridge deck steel plate and the end face of the U-shaped rib plate and used for positioning and installing the U-shaped rib plate on the bridge deck steel plate. The welding strip is used for being connected between the bridge deck steel plate and the end face of the U-shaped rib plate in an abutting mode, is in a U shape and is connected with a power source; the winding assembly is connected with the two ends of the welding strip and used for winding and unwinding the welding strip. The technical problem that in the prior art, adverse effects are generated due to secondary heating of a weld joint of a U-shaped rib can be solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of welding, and particularly relates to a welding device and a welding method for U-shaped rib plates used in bridges. Background Art

[0002] The U-rib (U-shaped stiffening rib) is one of the core load-bearing components of bridge steel structures (especially the steel box girder bridge deck). Its welding precision is directly related to the mechanical properties, fatigue life, and overall safety of the structure. In order to obtain better mechanical properties, the existing welding methods generally use two welds on the inner and outer sides of the U-rib. The outer side is welded by a manipulator, and the inner side is welded by a tunnel robot. However, it is difficult to weld the inner and outer sides simultaneously. The heat generated by the secondary welding on the same sidewall will cause metallographic changes and / or mechanical property changes in the weld on the other side. Therefore, finding a method that can complete the welding of the inner and outer sides of the U-rib at one time to reduce the adverse effects caused by secondary heating is a technical problem that needs to be urgently solved by those skilled in the art.

[0003] The patent with the publication number CN1080226A discloses a resistance diffusion welding process method for copper and low-carbon steel. It uses a spot welder that directly contacts the welding area. After being energized and heated, the heat in the welding area is highly concentrated, and copper and low-carbon steel simultaneously undergo plastic deformation and then diffusion. After 0.5 - 1 second, they are welded into one body.

[0004] The existing technology has the following problems. Although the spot welder can achieve simultaneous welding of the inner and outer sides of the U-rib sidewall and obtain a more stable welding effect, it can only have point contact and surface contact, and the weld of the U-rib will still be adversely affected by secondary heating in the length direction. Summary of the Invention

[0005] The present invention provides a welding device and a welding method for U-shaped rib plates used in bridges, which can solve the technical problem of adverse effects caused by secondary heating in the weld of the U-rib in the prior art.

[0006] To achieve the above object, the present invention is realized through the following technical solutions:

[0007] The present application provides a welding device for U-shaped rib plates used in bridges, which includes:

[0008] A workbench, arranged at the welding station, and the workbench is used for installing the bridge deck steel plate;

[0009] A positioning assembly, connected between the end faces of the bridge deck steel plate and the U-shaped rib plate, and used for positioning and installing the U-shaped rib plate on the bridge deck steel plate;

[0010] A welding bar, used for abutting between the end faces of the bridge deck steel plate and the U-shaped rib plate, the welding bar is U-shaped, and the welding bar is connected with a power source;

[0011] The rewinding assembly is connected to both ends of the welding strip, and the rewinding assembly is used for rewinding and unwinding the welding strip;

[0012] The above-mentioned welding strip has a tungsten strip and two nickel-chromium alloy strips. The nickel-chromium alloy strip is connected to the rewinding assembly, the tungsten strip is connected between the two nickel-chromium alloy strips. After the nickel-chromium alloy strip is electrified, it preheats the end faces of the bridge deck steel plate and the U-rib plate. After the tungsten strip is electrified, it heats and melts the end faces of the bridge deck steel plate and the U-rib plate for welding. When the rewinding assembly retracts the welding strip, the tungsten strip performs connecting heating and melting welding along the length direction of the U-rib plate.

[0013] Through the above technical solution, the welding strip is abutted between the end faces of the bridge deck steel plate and the U-rib plate for heating and melting welding, so that the contact surfaces of the two are fully melted and welded, avoiding the adverse effects caused by secondary heating of the weld seam, and improving the metallographic stability and mechanical property stability after welding.

[0014] In the present invention, the above-mentioned positioning assembly includes:

[0015] The clamping frame is clamped to the side surface in the length direction of the bridge deck steel plate;

[0016] The air cylinder is connected to the clamping frame;

[0017] The locking ring connects the U-rib plate to the movable end of the air cylinder;

[0018] The gap or extrusion force between the U-rib plate and the bridge deck steel plate is adjusted by the lifting of the air cylinder.

[0019] Through the above technical solution, the air cylinder is used to lift and adjust the gap or extrusion force between the U-rib plate and the bridge deck steel plate, avoiding the welding strip from being unable to slide or break due to the self-weight of the U-rib plate, and optimizing the passing performance of the welding strip.

[0020] In the present invention, the above-mentioned rewinding assembly includes:

[0021] The bracket is connected to the workbench;

[0022] The rewinding roller is rotatably connected to the bracket. The rewinding roller is connected to the nickel-chromium alloy strip. When the rewinding roller rotates, it pulls the nickel-chromium alloy strip to be rewound and unwound;

[0023] The driving motor is in transmission connection with the rewinding roller.

[0024] Through the above technical solution, the rewinding roller can be used to complete the traction of the welding strip in a limited space, optimizing the space size of the welding device.

[0025] In the present invention, the above-mentioned rewinding assembly further includes:

[0026] The fan blade is rotatably connected to the bracket, and the fan blade is in transmission connection with the drive motor;

[0027] A plurality of heat dissipation fins are arranged annularly inside the winding roller, and the heat dissipation fins are used to conduct the heat of the nickel-chromium alloy strip coiled outside the winding roller.

[0028] Through the above technical solution, the drive motor is used to drive the fan blade and the winding roller simultaneously, saving the setting of the power source and improving the heat dissipation performance of the winding roller.

[0029] In the present invention, the above welding device further includes:

[0030] The cushion block abuts between the bridge deck steel plate and the workbench. The cushion blocks are arranged in parallel along the length direction of the U-rib plate, and the cushion blocks are arranged below the central axis of the bridge deck steel plate or below both sides of the central axis of the bridge deck steel plate;

[0031] A plurality of pressing plates are connected to the workbench. The pressing plates are arranged at equal intervals along the length direction of the bridge deck steel plate. The pressing plates and the cushion blocks make the bridge deck steel plate deflect upward to eliminate welding stress.

[0032] Through the above technical solution, the deflection upward of the bridge deck steel plate is realized by using the cushion blocks and the pressing plates to cope with the stress of material shrinkage after welding, and the geometric dimension accuracy after welding is improved.

[0033] In the present invention, the above welding device further includes:

[0034] The nano-ceramic layer is coated on the outer side of the nickel-chromium alloy strip;

[0035] The lubricating layer is coated on the outer side of the nano-ceramic layer.

[0036] Through the above technical solution, the nano-ceramic layer plays an insulating role on the one hand and improves the structural rigidity of the welding strip on the other hand, while the lubricating layer further enhances the insulating effect and the passing performance of the welding strip.

[0037] This application also provides a welding method for the U-rib plate of a bridge. It uses the above welding device for the U-rib plate of a bridge and further includes the following steps:

[0038] Step S10: Install the bridge deck steel plate on the workbench, place the U-rib plate above the bridge deck steel plate, and use the positioning component to position and lift the U-rib plate;

[0039] Step S20: Thread the welding strip between the end face of the U-rib plate and the bridge deck steel plate, and then adjust the positioning component so that the welding strip can slide between the end face of the U-rib plate and the bridge deck steel plate;

[0040] Step S30: The welding strip is powered on to heat the end face of the U-rib plate and the bridge deck steel plate. After the two sides of the corresponding position of the tungsten strip start to melt to form a molten pool, the driving motor is started to wind up the welding strip, and the molten pool displaces along the length direction of the U-rib plate with the displacement of the tungsten strip.

[0041] Through the above technical solution, the contact position between the bridge deck steel plate and the end face of the U-rib plate is melted by the welding strip, so as to obtain sufficient welding depth, and the adverse effects caused by the heat generated by the secondary welding during the separate welding of the inner and outer sides of the U-rib plate are also avoided, improving the welding effect.

[0042] In the present invention, between the above step S10 and step S20, the following is further included:

[0043] Step S15: Lift the bridge deck steel plate and place the spacer block below it, and use the pressing plates on both sides of the bridge deck steel plate to make the bridge deck steel plate deflect.

[0044] Through the above technical solution, the deflection of the bridge deck steel plate is realized by using the spacer block and the pressing plate to cope with the stress caused by the shrinkage of the material after welding, improving the geometric dimension accuracy after welding.

[0045] In summary, the present application has the following effects:

[0046] 1. The welding strip is abutted between the end faces of the bridge deck steel plate and the U-rib plate for heating and melting welding, so that the contact surfaces of the two are fully melted and welded, avoiding the adverse effects caused by the secondary heating of the weld seam, and improving the metallographic stability and mechanical property stability after welding;

[0047] 2. The cylinder is used to lift and lower the U-rib plate to adjust the gap or extrusion force between the U-rib plate and the bridge deck steel plate, avoiding the welding strip from being unable to slide or break due to the self-weight of the U-rib plate, and optimizing the passing performance of the welding strip;

[0048] 3. The winding roller is adopted, which can complete the traction of the welding strip in a limited space, optimizing the space size of the welding device;

[0049] 4. The driving motor is used to drive the fan blade and the winding roller at the same time, saving the setting of the power source and improving the heat dissipation performance of the winding roller;

[0050] 5. The deflection of the bridge deck steel plate is realized by using the spacer block and the pressing plate to cope with the stress caused by the shrinkage of the material after welding, improving the geometric dimension accuracy after welding;

[0051] 6. The nano-ceramic layer is adopted to play an insulating role on the one hand, and improve the structural rigidity of the welding strip on the other hand, while the lubricating layer further strengthens the insulating effect and the passing performance of the welding strip. Description of the Drawings

[0052] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0053] Figure 1 Isometric view of a U-rib plate welding device for bridges provided by an embodiment of the present invention after clamping the bridge deck steel plate and the U-rib plate;

[0054] Figure 2 Side view of a U-rib plate welding device for bridges provided by an embodiment of the present invention after clamping the bridge deck steel plate and the U-rib plate;

[0055] Figure 3 Is Figure 2 Cross-sectional view taken along line A-A in

[0056] Figure 4 Front view of a U-rib plate welding device for bridges provided by an embodiment of the present invention after clamping the bridge deck steel plate and the U-rib plate;

[0057] Figure 5 Is Figure 4 Cross-sectional view taken along line B-B in

[0058] Figure 6 Is Figure 5 Partial enlarged view at C in

[0059] Figure 7 Is Figure 4 Cross-sectional view taken along line D-D in

[0060] Figure 8 Is Figure 7 Partial enlarged view at E in

[0061] Figure 9 Partial structural schematic diagram of the welding rod provided by an embodiment of the present invention;

[0062] Figure 10 Cross-sectional view of the welding rod provided by an embodiment of the present invention;

[0063] Figure 11 Is Figure 10 Cross-sectional view taken along line F-F in

[0064] Icons: 1 - Workbench; 2 - Positioning component; 201 - Clamping bracket; 202 - Cylinder; 203 - Locking ring; 3 - Welding strip; 301 - Tungsten strip; 3011 - Heating area; 3012 - Gradient area; 302 - Nickel-chromium alloy strip; 303 - Insulating layer; 304 - Nano-ceramic layer; 305 - Lubricating layer; 306 - Transition area; 4 - Rewinding component; 401 - Rewinding roller; 402 - Fan blade; 403 - Heat dissipation fins; 404 - Driving motor; 405 - Bracket; 501 - Spacer block; 502 - Pressure plate; 6 - Bridge deck steel plate; 7 - U-rib plate. Detailed implementation manners

[0065] The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0066] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0067] The terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise specified, the meaning of "a plurality" is two or more.

[0068] In the description of the present application, it should be noted that, unless otherwise clearly defined and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it may be welding, bolt connection, or riveting; it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0069] Embodiment:

[0070] Please refer to Figures 1 to 11 , Figures 1 to 11 which shows an embodiment of the present application.

[0071] This embodiment provides a welding device for U-rib plates of bridges. As Figures 1 to 3 shown, it includes:

[0072] Workbench 1 is set at the welding station. Exemplarily, it can refer to the fixed workbench of a gantry machining center. Workbench 1 is used to install the bridge deck steel plate 6. When placing, a traveling crane uses a magnetic chuck to suck the bridge deck steel plate 6 and places it parallel to the T-shaped groove of workbench 1 to ensure the correct placement angle;

[0073] As Figure 3 shown, the positioning assembly 2 is connected between the end faces of the bridge deck steel plate 6 and the U-rib 7 and is used to position and install the U-rib 7 on the bridge deck steel plate 6;

[0074] As Figure 6 shown, the welding strip 3 is used to abut between the end faces of the bridge deck steel plate 6 and the U-rib 7. As Figure 11 shown, the welding strip 3 is U-shaped and is provided with an insulating layer 303 in the middle. Exemplarily, zirconia fiber cloth is used, which can work at 1500 °C - 2200 °C for a long time and can still maintain a complete fiber form at 2500 °C. It is used to prevent the electric arc from breaking through. The welding strip 3 is connected to a power supply. The power supply uses an externally purchasable finished product. It should be noted that any power supply with an adjustment function that can be used to heat the resistance wire can be used, so no further description and specific limitation will be given;

[0075] As Figure 3 shown, the winding assembly 4 is connected to both ends of the welding strip 3. It should be noted that as Figure 11 shown, both ends of the welding strip 3 are nickel-chromium alloy strips 302, and the tungsten strip 301 is in the middle section of the welding strip 3. The winding assembly 4 is used to wind and unwind the welding strip 3;

[0076] The above-mentioned welding strip 3 has a section of tungsten strip 301 and two sections of nickel-chromium alloy strips 302. The nickel-chromium alloy strip 302 is connected to the winding assembly 4, and the tungsten strip 301 is connected between the two sections of nickel-chromium alloy strips 302. The tungsten strip 301 has a heating zone 3011 and a gradually widening gradient zone 3012. At the same time, there is also a transition zone 306 between the tungsten strip 301 and the nickel-chromium alloy strip 302. The transition zone 306 is formed by an infiltration welding process to avoid adding additional solder and affecting the welding performance at high temperatures. After the nickel-chromium alloy strip 302 is energized, it preheats the end faces of the bridge deck steel plate 6 and the U-rib 7. After the tungsten strip 301 is energized, it heats and melts the end faces of the bridge deck steel plate 6 and the U-rib 7 for welding. When the winding assembly 4 retracts the welding strip 3, the tungsten strip 301 performs connecting heating and melting welding along the length direction of the U-rib 7.

[0077] It should be noted that the U-rib plate 7 and the bridge deck steel plate 6 are generally made of low-carbon high-strength steels such as Q345, whose melting points are generally between 1450 °C and 1500 °C. The softening temperature of tungsten is 1600 °C, the melting point of nickel-chromium alloy is about 1400 °C (however, nickel-chromium alloy is only used for preheating), the melting point of nano-aluminum oxide ceramic is about 2050 °C, and the melting point of boron nitride is about 3000 °C. The operating temperature of the insulating layer 303 is also between 1500 °C and 2200 °C. Therefore, when the heating zone 3011 of the tungsten bar 301 is maintained in the operating temperature range of 1500 °C - 1600 °C, it can not only ensure the heating and melting of the steel, but also ensure the stability of the welding rod 3 itself. As shown in Figure 11 , because there is also a gradual change zone 3012 in the tungsten bar 301, whose width gradually increases and the resistance decreases, so the temperature will gradually transition from 1500 °C to below 1400 °C to ensure that the nickel-chromium alloy bar 302 will not melt. The width of the heating zone 3011 of the tungsten bar 301 is smaller than that of the gradual change zone 3012. Therefore, the resistance of the heating zone 3011 is greater than that of the gradual change zone 3012, and thus more heat will be generated in the heating zone 3011. Although the tungsten bar 301 and the nickel-chromium alloy bar 302 themselves also have heat conductivities, Q345 will also absorb the heat generated in the heating zone 3011 for heat dissipation. When the heat generation and heat dissipation are balanced, the temperature at the position with a large resistance will still be significantly higher than other regions, thus forming a temperature gradient. Due to the existence of the temperature gradient, the temperature ranges for different-position metals to be in stable operation can be satisfied. However, how to set different ranges needs to be theoretically calculated and experimentally tested a limited number of times by those skilled in the art according to the actual working object to obtain specific parameters. The specific parameters of the welding rod 3 do not fall within the protection scope of this application, so no detailed description and specific limitation are made.

[0078] Through the above technical solution, the welding rod 3 is abutted between the end faces of the bridge deck steel plate 6 and the U-rib plate 7 for heating and melting welding, so that the contact surfaces of the two are fully melted and welded, avoiding the adverse effects caused by secondary heating of the weld seam, and improving the metallographic stability and mechanical property stability after welding.

[0079] As a preferred implementation manner, the positioning assembly 2 includes:

[0080] A clamping frame 201, clamped to the side surface in the length direction of the bridge deck steel plate 6;

[0081] A cylinder 202, connected to the clamping frame 201;

[0082] A locking ring 203, connecting the U-rib plate 7 to the movable end of the cylinder 202;

[0083] The gap or extrusion force between the U-rib plate 7 and the bridge deck steel plate 6 is adjusted by the lifting of the cylinder 202.

[0084] It should be noted that the specific control and linkage of the cylinder 202 belong to the prior art and are not within the protection scope of this application. Those skilled in the art can make selections according to the disclosed technical solutions or technical manuals, textbooks, etc., and no specific description and further limitation will be made here.

[0085] Through the above technical solution, the cylinder 202 is used to lift and adjust the gap or extrusion force between the U-rib 7 and the bridge deck steel plate 6, avoiding the inability of the welding strip 3 to slide or break due to the self-weight of the U-rib 7, and optimizing the passing performance of the welding strip 3.

[0086] As a preferred embodiment, as Figure 3 shown, the above-mentioned winding assembly 4 includes:

[0087] A bracket 405, connected to the workbench 1;

[0088] A winding roller 401, rotatably connected to the bracket 405, the winding roller 401 is connected to the nickel-chromium alloy strip 302, and when the winding roller 401 rotates, it pulls the nickel-chromium alloy strip 302 to wind and unwind;

[0089] A driving motor 404, drivingly connected to the winding roller 401.

[0090] The driving motor 404 directly drives the annular rack inside the winding roller 401 with a small gear, making the winding roller 401 rotate slowly. The radius of the winding roller 401 needs to be selected in combination with the maximum bending radius of the welding strip 3. It should be noted that the maximum bending radius needs to be determined through theoretical calculation and limited trial production tests according to parameters such as the thickness and yield strength of the nano-ceramic layer 304, and the maximum bending radius of the welding strip 3 needs to be selected in combination with the specific dimensions of various base materials inside it and the thickness of the coating. Those skilled in the art can select appropriate dimensional parameters through limited tests. The specific dimensional parameters are not within the protection scope of this application, so no further description and specific limitation will be made. Exemplarily, when the thickness of the tungsten strip 301 (metal sheet) is 0.8 mm, the width of the welding strip 3 is D, the length of the heating zone 3011 of the tungsten strip 301 is L, and L≥2D, the insulating nano-ceramic layer 304 with a thickness of 20 um is used to wrap the tungsten strip 301, and both sides in the thickness direction are in direct contact with the Q345 material, and the Q345 material is not charged. It is necessary to heat the smallest section of the tungsten strip 301 to 1600 degrees Celsius while the potential cannot break through the insulating nano-ceramic coating. However, at this time, the minimum width D does not exist through theoretical demonstration, and a lubricating layer 305 needs to be added outside the insulating nano-ceramic layer 304. Exemplarily, boron nitride is selected to obtain sufficient dielectric constant.

[0091] Through the above technical solution, by using the winding roller 401, the traction of the welding strip 3 can be completed in a limited space, optimizing the space size of the welding device.

[0092] As a preferred embodiment, the above-mentioned coiling assembly 4 further includes:

[0093] A fan blade 402, rotatably connected to the bracket 405, and the fan blade 402 is in transmission connection with the driving motor 404;

[0094] A plurality of heat dissipation fins 403, arranged annularly inside the coiling roller 401, and the heat dissipation fins 403 are used to conduct the heat of the nickel-chromium alloy strip 302 coiled on the outer side of the coiling roller 401.

[0095] Through the above technical solution, the driving motor 404 is adopted to drive the fan blade 402 and the coiling roller 401 simultaneously, saving the setting of the power source and improving the heat dissipation performance of the coiling roller 401.

[0096] As a preferred embodiment, the above-mentioned welding device further includes:

[0097] A cushion block 501, abutted between the bridge deck steel plate 6 and the workbench 1, the cushion block 501 is arranged parallel to the length direction of the U-rib 7, and the cushion block 501 is arranged below the central axis of the bridge deck steel plate 6 or below both sides of the central axis of the bridge deck steel plate 6;

[0098] A plurality of pressing plates 502, connected to the workbench 1, the pressing plates 502 are arranged at equal intervals along the length direction of the bridge deck steel plate 6, and the pressing plates 502 and the cushion block 501 make the bridge deck steel plate 6 deflect to eliminate welding stress.

[0099] Through the above technical solution, the cushion block 501 and the pressing plate 502 are adopted to realize the deflection of the bridge deck steel plate 6 to cope with the stress of material shrinkage after welding, and improve the geometric dimension accuracy after welding.

[0100] As a preferred embodiment, the above-mentioned welding device further includes:

[0101] A nano-ceramic layer 304, exemplarily made of nano-aluminum oxide ceramic, is coated on the outer side of the nickel-chromium alloy strip 302;

[0102] A lubricating layer 305, exemplarily made of boron nitride coating, is coated on the outer side of the nano-ceramic layer 304.

[0103] Through the above technical solution, the nano-ceramic layer 304 plays an insulating role on the one hand and improves the structural rigidity of the welding strip 3 on the other hand, while the lubricating layer 305 further enhances the insulating effect and the passing performance of the welding strip 3.

[0104] The following steps are adopted during use:

[0105] Step S10: Install the bridge deck steel plate 6 on the workbench 1, place the U-rib plate 7 above the bridge deck steel plate 6, and use the positioning assembly 2 to position and lift the U-rib plate 7.

[0106] Step S20: Pass a welding strip 3 between the end face of the U-rib plate 7 and the bridge deck steel plate 6, and then adjust the positioning assembly 2 so that the welding strip 3 can slide between the end face of the U-rib plate 7 and the bridge deck steel plate 6.

[0107] Step S30: Connect the welding strip 3 to a power source to heat the end face of the U-rib plate 7 and the bridge deck steel plate 6. After the two sides of the corresponding position of the tungsten strip 301 start to melt to form a molten pool, start the drive motor 404 to wind up the welding strip 3, and the molten pool displaces along the length direction of the U-rib plate 7 with the displacement of the tungsten strip 301.

[0108] As a preferred implementation, between the above step S10 and step S20, it further includes:

[0109] Step S15: Lift the bridge deck steel plate 6 and place a spacer 501 under it, and use the pressing plates 502 on both sides of the bridge deck steel plate 6 to make the bridge deck steel plate 6 deflect.

[0110] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope recorded by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claimed rights.

Claims

1. A U-rib plate welding device for bridges, characterized in that, Comprising: A workbench (1), arranged at the welding station, and the workbench (1) is used for installing the bridge deck steel plate (6); A positioning component (2), connected between the end faces of the bridge deck steel plate (6) and the U-rib plate (7), and used for positioning and installing the U-rib plate (7) on the bridge deck steel plate (6); A welding strip (3), used for abutting between the end faces of the bridge deck steel plate (6) and the U-rib plate (7), the welding strip (3) is U-shaped, and the welding strip (3) is connected with a power source; A winding component (4), connected to both ends of the welding strip (3), and the winding component (4) is used for winding and unwinding the welding strip (3); The welding strip (3) has a tungsten strip (301) and two nickel-chromium alloy strips (302), the nickel-chromium alloy strips (302) are connected with the winding component (4), the tungsten strip (301) is connected between the two nickel-chromium alloy strips (302), after the nickel-chromium alloy strips (302) are electrified, they preheat the end faces of the bridge deck steel plate (6) and the U-rib plate (7), after the tungsten strip (301) is electrified, it heats and melts the end faces of the bridge deck steel plate (6) and the U-rib plate (7) for welding, when the winding component (4) retracts the welding strip (3), the tungsten strip (301) performs connecting heating and melting welding along the length direction of the U-rib plate (7).

2. The U-rib plate welding device for bridges according to claim 1, characterized in that, The positioning component (2) includes: A clamping frame (201), clamped to the side surface in the length direction of the bridge deck steel plate (6); A cylinder (202), connected to the clamping frame (201); A locking ring (203), connecting the U-rib plate (7) to the movable end of the cylinder (202); The gap or extrusion force between the U-rib plate (7) and the bridge deck steel plate (6) is adjusted by the lifting of the cylinder (202).

3. The U-rib plate welding device for bridges according to claim 2, wherein, The winding component (4) includes: A bracket (405), connected to the workbench (1); A winding roller (401), rotatably connected to the bracket (405), the winding roller (401) is connected with the nickel-chromium alloy strip (302), and when the winding roller (401) rotates, it pulls the nickel-chromium alloy strip (302) to wind and unwind; A driving motor (404), in transmission connection with the winding roller (401).

4. The U-rib plate welding device for bridges according to claim 3, characterized in that, The winding component (4) further includes: A fan blade (402), rotatably connected to the bracket (405), the fan blade (402) is in transmission connection with the driving motor (404); A plurality of heat dissipation fins (403), arranged around the inner side of the winding roller (401), and the heat dissipation fins (403) are used for guiding out the heat of the nickel-chromium alloy strip (302) coiled outside the winding roller (401).

5. The U-rib plate welding device for bridges according to claim 4, characterized in that, It further includes: A cushion block (501), abutting between the bridge deck steel plate (6) and the workbench (1), the cushion block (501) is arranged parallel to the length direction of the U-rib plate (7), and the cushion block (501) is arranged below the central axis of the bridge deck steel plate (6) or below both sides of the central axis of the bridge deck steel plate (6); A plurality of pressing plates (502) are connected to the workbench (1), the pressing plates (502) are arranged at equal intervals along the length direction of the bridge deck steel plate (6), and the pressing plates (502) and the cushion blocks (501) make the bridge deck steel plate (6) deflect upward to eliminate welding stress.

6. The U-rib plate welding device for bridges according to claim 5, characterized in that, It further includes: A nano-ceramic layer (304) coated on the outer side of the nickel-chromium alloy strip (302); A lubricating layer (305) coated on the outer side of the nano-ceramic layer (304).

7. A welding method for U-shaped rib plates used in bridges, characterized in that, When using the U-rib plate welding device for bridges as described in claim 6, the following steps are further included: Step S10: Install the bridge deck steel plate (6) on the workbench (1), place the U-rib plate (7) above the bridge deck steel plate (6), and use the positioning assembly (2) to position and lift the U-rib plate (7); Step S20: Pass the welding strip (3) through between the end face of the U-rib plate (7) and the bridge deck steel plate (6), and then adjust the positioning assembly (2) to enable the welding strip (3) to slide between the end face of the U-rib plate (7) and the bridge deck steel plate (6); Step S30: Connect the welding strip (3) to a power source to heat the end face of the U-rib plate (7) and the bridge deck steel plate (6). After the two sides of the corresponding position of the tungsten strip (301) start to melt to form a molten pool, start the drive motor (404) to wind up the welding strip (3), and the molten pool displaces along the length direction of the U-rib plate (7) as the tungsten strip (301) displaces.

8. The welding method of the U-shaped rib plate for bridges according to claim 7, characterized in that Between step S10 and step S20, the following is further included: Step S15: Lift the bridge deck steel plate (6) and place the cushion block (501) under it, and use the pressing plates (502) on both sides of the bridge deck steel plate (6) to make the bridge deck steel plate (6) deflect upward.

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