Welding machining device for expansion joints of roads and bridges

Abstract

The invention relates to the field of expansion joint machining equipment, and discloses a road and bridge expansion joint welding machining device which comprises a workbench, the two sides of the workbench are each sequentially provided with a first welding station and a second welding station, the upper surface of the workbench is provided with a conveying clamping mechanism, and the conveying clamping mechanism is used for clamping and fixing an expansion joint prefabricated part; a to-be-welded point of the expansion joint prefabricated part is driven to sequentially pass through a first welding station and a second welding station, a first welding mechanism is arranged in the first welding station and used for welding an anchor plate to the bottom of the expansion joint prefabricated part, and a second welding mechanism is arranged in the second welding station and used for welding the anchor plate to the bottom of the expansion joint prefabricated part. And the anchoring steel bar is clamped and moved into the second welding mechanism through the feeding mechanical arm. And through the adjustable structure of the bottom plate and the movable structures of the first welding mechanism and the second welding mechanism, the machining device is suitable for welding expansion joint prefabricated parts of various specifications and sizes, and the applicability of the device is improved.

Description

Technical Field

[0001] The present invention relates to the field of expansion joint processing equipment, and particularly to a welding processing device for road and bridge expansion joints. Background Art

[0002] As an important part of the bridge structure, the welding quality of the expansion joint precast directly affects the durability and safety of the bridge structure. Traditional welding processes mostly use manual operation or single-station semi-automatic equipment.

[0003] There are some defects in the traditional welding processes commonly used in the current industry. For example, most existing welding equipment is designed with a single station, and the anchor plate and anchor reinforcement need to be welded step by step. The processing cycle of a single group of expansion joints is long, which is difficult to meet the requirements of large-scale construction of bridge projects. Moreover, the welding of the anchor plate and the reinforcement needs to be completed on different equipment respectively, with a long logistics handling distance and low material turnover efficiency. The welding of the anchor reinforcement and the precast needs to be completed in a narrow space, and it is difficult to achieve 360° full-circle welding with the traditional straight welding method, and the weld coverage rate only reaches 75%, resulting in this part becoming a weak link in the bridge structure. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present invention provides a welding processing device for road and bridge expansion joints, which solves the problems of traditional welding processes.

[0005] To achieve the above objectives, the present invention is realized through the following technical solutions: A welding processing device for road and bridge expansion joints includes a workbench. On both sides of the workbench, a welding station one and a welding station two are sequentially arranged. On the upper surface of the workbench, a conveying and clamping mechanism is provided. The conveying and clamping mechanism is used to clamp and fix the expansion joint precast, and drive the welding points to be welded of the expansion joint precast to pass through the welding station one and the welding station two in sequence. A welding mechanism one is arranged in the welding station one, and the welding mechanism one is used to weld the anchor plate to the bottom of the expansion joint precast. A welding mechanism two is arranged in the welding station two. When the anchor reinforcement is clamped and moved to the welding mechanism two by the loading robotic arm, the welding mechanism two clamps and fixes the anchor reinforcement, and welds the two end parts of the anchor reinforcement to the outer wall of the expansion joint precast and the side wall of the anchor plate respectively.

[0006] Preferably, the workbench includes a main tabletop, and auxiliary tabletops symmetrically extending from the middle part of the main tabletop to both sides and fixedly connected thereto.

[0007] Preferably, the conveying and clamping mechanism includes a conveyor, the bottom wall of the conveyor is fixedly connected to the upper surface of the main tabletop, and a clamping device is fixedly connected to the conveying end of the conveyor to clamp and fix the expansion joint precast through the clamping device.

[0008] Preferably, the clamping device includes two symmetrically arranged bottom plates. The bottom wall of the bottom plate is fixedly connected to the conveying end of the conveyor. One side of the bottom plate extends horizontally towards the auxiliary tabletop. A clamping groove is formed in the bottom plate. Three side walls of the clamping groove away from the auxiliary tabletop are all provided with pressing plates. The pressing plates are fixedly connected to the inner side walls of the clamping groove through electric push rods. An opening part penetrating up and down is formed in the bottom wall of the clamping groove close to the auxiliary tabletop. When welding, the expansion joint prefabricated part is clamped into the clamping groove, and the electric push rod pushes the pressing plate to clamp and fix three sides of the expansion joint prefabricated part. At the same time, the welding point to be welded on the bottom wall of the expansion joint prefabricated part is located directly above the opening part.

[0009] Preferably, the first welding mechanism includes two symmetrically arranged welding arms I. One end of the welding arm I is provided with a welding head I, and the other end is fixedly connected to the top of the first support. The bottom of the first support is slidably connected to the upper surface of the auxiliary tabletop. One side of the first support away from the main tabletop is fixedly connected to the output end of the first cylinder. The outer wall of the first cylinder is fixedly connected to the outer wall of the auxiliary tabletop through the first support column.

[0010] Preferably, the second welding mechanism includes a mounting plate. The bottom wall of the mounting plate is slidably connected to the upper surface of the auxiliary tabletop, and one side of the mounting plate is connected to the auxiliary tabletop through the first spring. The mounting plate is pushed away from the main tabletop by the first spring. A chute is formed in the upper part of the mounting plate. Two symmetrically arranged second supports are slidably connected in the chute. The two second supports are driven by a centering device to move towards each other. A middle clamp is fixedly connected to the upper part of the second support. An upper clamp is arranged above the middle clamp, and a lower clamp is arranged below the middle clamp. The upper clamp and the lower clamp are symmetrically arranged with the middle clamp as the center, and the upper clamp and the lower clamp are respectively connected to the middle clamp through connecting rod members. When the centering device drives the two second supports to move towards each other, the combination of the symmetrically arranged upper clamp, middle clamp and lower clamp clamps the anchoring steel bars in a three-point manner.

[0011] Preferably, semi-circular supports are respectively slidably connected to the opposite sides of the two upper clamps. An arc-shaped groove is formed in the semi-circular support. A slider is slidably connected in the arc-shaped groove. Both sides of the slider are respectively connected to the upper and lower inner walls of the arc-shaped groove through the second spring. The center of the slider penetrates and is fixedly connected to the second welding arm. One end of the second welding arm is provided with a second welding head, and the other end is fixedly connected with a pin. A sliding table is also slidably connected to the mounting plate. A support plate is slidably connected to the upper part of the sliding table. A third spring is arranged between the support plate and the sliding table. The support plate is pushed away from the main tabletop by the third spring. One side of the upper part of the support plate facing the main tabletop is rotatably connected with a turntable, and the other side is fixedly connected with a second motor. The output end of the second motor penetrates the support plate and is fixedly connected to the center of the turntable. A limiting groove corresponding to the pin is formed on the side of the turntable facing the main tabletop. The middle part of the support plate is fixedly connected to the output end of the third cylinder. The outer wall of the third cylinder is fixedly connected to the auxiliary tabletop through the second support column.

[0012] Preferably, a second cylinder is fixedly connected to the outer side wall of one of the lower jigs. The output end of the second cylinder is fixedly connected to two symmetrically arranged welding arms III. A welding head III is arranged at one end of the welding arm III facing the main tabletop.

[0013] The present invention provides a welding and processing device for road bridge expansion joints, having the following beneficial effects: In the present invention, a first welding station and a second welding station are sequentially arranged on both sides of the workbench, enabling the processing device to achieve multi-process collaborative welding operations and parallel operations of anchor plate welding and anchor reinforcement welding, significantly improving the processing efficiency. Through the adjustable structure of the bottom plate and in cooperation with the displaceable structures of the first welding mechanism and the second welding mechanism, the processing device is applicable to the welding of expansion joint prefabricated parts of various specifications and sizes, improving the applicability of the device. Through the three-point clamping structure in the second welding mechanism, the clamping and fixing of anchor reinforcements of various specifications are realized. Meanwhile, through the setting of the semi-circular bracket, the motor II drives the turntable to rotate back and forth periodically with a fixed amplitude in the positive and negative directions, thereby driving the welding head II to rotate and perform rotary welding on the contact positions between the anchor reinforcement and the expansion joint prefabricated part, enabling the welding surfaces of the two welding heads II to be superposed to fully cover the entire welding track, thus improving the welding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a three-dimensional schematic diagram of the welding and processing device of the present invention; Figure 2 is Figure 1 an enlarged view of part A in Figure 3 is Figure 1 an enlarged view of part B in Figure 4 is Figure 1 an enlarged view of part C in Figure 5 is Figure 1 an enlarged view of part D in Figure 6 is a structural schematic diagram of the bottom plate in the present invention; Figure 7 is a structural schematic diagram of the second welding mechanism in the present invention.

[0015] Among them, 1. Workbench; 101. Main tabletop; 102. Auxiliary tabletop; 2. Welding mechanism one; 201. Welding arm one; 202. Welding head one; 203. Bracket one; 204. Cylinder one; 205. Support pillar one; 3. Welding mechanism two; 301. Mounting plate; 302. Spring one; 303. Slide groove; 304. Bracket two; 305. Middle fixture; 306. Upper fixture; 307. Lower fixture; 308. Link member; 309. Semi-circular bracket; 310. Arc groove; 311. Slide block; 312. Spring two; 313. Welding arm two; 314. Welding head two; 315. Pin; 316. Welding arm three; 317. Welding head three; 318. Cylinder two; 319. Slide table; 320. Support plate; 321. Spring three; 322. Turntable; 323. Motor two; 324. Limit groove; 325. Cylinder three; 326. Support pillar two; 4. Conveyor; 5. Bottom plate; 501. Card slot; 502. Pressure plate; 503. Electric push rod; 504. Opening part. Detailed implementation manner

[0016] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0017] Please refer to the attached Figure 1 - attached Figure 7 As shown in the figure, the embodiment of the present invention provides a welding and processing device for road and bridge expansion joints, including a workbench 1. On both sides of the workbench 1, a welding station one and a welding station two are sequentially arranged. A conveying and clamping mechanism is arranged on the upper surface of the workbench 1. The conveying and clamping mechanism is used to clamp and fix the expansion joint prefabricated parts, and drive the welding points to be welded of the expansion joint prefabricated parts to pass through the welding station one and the welding station two in sequence. A welding mechanism one 2 is arranged in the welding station one. The welding mechanism one 2 is used to weld the anchor plate to the bottom of the expansion joint prefabricated parts. A welding mechanism two 3 is arranged in the welding station two. When the anchor reinforcement is clamped and moved into the welding mechanism two 3 by the loading robotic arm, the welding mechanism two 3 clamps and fixes the anchor reinforcement, and welds the two end parts of the anchor reinforcement to the outer wall of the expansion joint prefabricated parts and the side wall of the anchor plate respectively.

[0018] A double-station setting is adopted, that is, a welding station one and a welding station two. The expansion joint prefabricated parts are clamped and fixed by the conveying and clamping mechanism, and the welding points to be welded of the expansion joint prefabricated parts are driven to pass through the welding station one and the welding station two in sequence, so as to realize the welding of the anchor plate first and then the welding of the anchor reinforcement.

[0019] The workbench 1 includes a main tabletop 101, and auxiliary tabletops 102 fixedly connected to and symmetrically extending from both sides of the middle part of the main tabletop 101.

[0020] The workbench as a whole adopts a symmetrical structure, enabling welding operations to be carried out on both sides simultaneously, exactly synchronizing the welding processes of two matching expansion joint prefabricated parts.

[0021] The conveying and clamping mechanism includes a conveyor 4, the bottom wall of the conveyor 4 is fixedly connected to the upper surface of the main tabletop 101, and a clamping device is fixedly connected to the conveying end of the conveyor 4. The expansion joint prefabricated part is clamped and fixed by the clamping device. The clamping device includes two symmetrically arranged bottom plates 5, the bottom wall of the bottom plate 5 is fixedly connected to the conveying end of the conveyor 4, one side of the bottom plate 5 horizontally extends towards the auxiliary tabletop 102, a clamping groove 501 is formed in the bottom plate 5, and pressing plates 502 are arranged on three side walls of the clamping groove 501 far from the auxiliary tabletop 102. The pressing plates 502 are fixedly connected to the inner side wall of the clamping groove 501 through electric push rods 503. An opening 504 penetrating up and down is formed in the bottom wall of the clamping groove 501 close to the auxiliary tabletop 102. When welding, the expansion joint prefabricated part is inserted into the clamping groove 501, and the electric push rod 503 pushes the pressing plate 502 to clamp and fix three sides of the expansion joint prefabricated part. Meanwhile, the welding point to be welded on the bottom wall of the expansion joint prefabricated part is located directly above the opening 504.

[0022] One side of the expansion joint prefabricated part close to the opening 504 abuts against the inner wall of the same side of the clamping groove 501. Then, in cooperation with the electric push rod 503 pushing the pressing plate 502 to clamp three sides of the expansion joint prefabricated part, the fixation of the expansion joint prefabricated part is realized. And this fixation method makes the welding point to be welded on the bottom wall of the expansion joint prefabricated part always located directly above the opening 504, facilitating the subsequent welding process.

[0023] The first welding mechanism 2 includes two symmetrically arranged first welding arms 201. One end of the first welding arm 201 is provided with a first welding head 202, and the other end is fixedly connected to the top of a first support 203. The bottom of the first support 203 is slidably connected to the upper surface of the auxiliary tabletop 102. One side of the first support 203 far from the main tabletop 101 is fixedly connected to the output end of a first cylinder 204. The outer wall of the first cylinder 204 is fixedly connected to the outer wall of the auxiliary tabletop 102 through a first support column 205.

[0024] The first welding mechanism 2 is used for welding the anchoring plate. When the anchoring plate is clamped to the welding position by the loading robotic arm, the first cylinder 204 pushes the first bracket 203 to move, so that the two symmetrically arranged first welding arms 201 move towards the anchoring plate, and then the two symmetrically arranged first welding heads 202 move to the contact position between the bottom wall of the expansion joint precast and the top wall of the anchoring plate. The two first welding heads 202 are symmetrically arranged at a certain inclination angle, facing the two sides of the contact position between the bottom wall of the precast and the top wall of the anchoring plate. At the same time, the first welding heads 202 are connected to the welding equipment through connecting pipes. During welding, the welding equipment is started, so that the first welding heads 202 weld the expansion joint precast and the anchoring plate. With the slow push of the first cylinder 204, the first welding heads 202 are driven to move along the welding path, and finally the welding operation is realized.

[0025] The second welding mechanism 3 includes a mounting plate 301. The bottom wall of the mounting plate 301 is slidably connected to the upper surface of the auxiliary table surface 102, and one side of the mounting plate 301 is connected to the auxiliary table surface 102 through a first spring 302. The first spring 302 pushes the mounting plate 301 away from the main table surface 101. A chute 303 is formed in the upper part of the mounting plate 301. Two symmetrically arranged second brackets 304 are slidably connected in the chute 303. The two second brackets 304 are driven by a centering device to move towards each other. A middle clamp 305 is fixedly connected to the upper part of the second bracket 304. An upper clamp 306 is arranged above the middle clamp 305, and a lower clamp 307 is arranged below the middle clamp 305. The upper clamp 306 and the lower clamp 307 are symmetrically arranged with the middle clamp 305 as the center, and the upper clamp 306 and the lower clamp 307 are respectively connected to the middle clamp 305 through connecting rod members 308. When the centering device drives the two second brackets 304 to move towards each other, the combination of the symmetrically arranged upper clamp 306, middle clamp 305 and lower clamp 307 clamps the anchoring steel bar in a three-point manner. Semi-circular brackets 309 are respectively slidably connected to the opposite sides of the two upper clamps 306. An arc-shaped groove 310 is formed in the semi-circular bracket 309. A slider 311 is slidably connected in the arc-shaped groove 310. Both sides of the slider 311 are respectively connected to the upper and lower inner walls of the arc-shaped groove 310 through second springs 312. The center of the slider 311 penetrates and is fixedly connected to a second welding arm 313. One end of the second welding arm 313 is provided with a second welding head 314, and the other end is fixedly connected to a retaining pin 315. A slide table 319 is also slidably connected to the mounting plate 301. A support plate 320 is slidably connected to the upper part of the slide table 319. A third spring 321 is arranged between the support plate 320 and the slide table 319. The third spring 321 pushes the support plate 320 away from the main table surface 101. A turntable 322 is rotatably connected to the side of the support plate 320 facing the main table surface 101, and a second motor 323 is fixedly connected to the other side. The output end of the second motor 323 penetrates the support plate 320 and is fixedly connected to the center of the turntable 322. A limiting groove 324 corresponding to the retaining pin 315 is formed in the side of the turntable 322 facing the main table surface 101. The middle part of the support plate 320 is fixedly connected to the output end of a third cylinder 325. The outer wall of the third cylinder 325 is fixedly connected to the auxiliary table surface 102 through a second support column 326. A second cylinder 318 is fixedly connected to the outer side wall of one of the lower clamps 307. The output end of the second cylinder 318 is fixedly connected to two symmetrically arranged third welding arms 316. A third welding head 317 is arranged at one end of the third welding arm 316 facing the main table surface 101 After the welding of the anchor plate is completed, it is moved to the second welding station with the expansion joint prefabricated part. The anchor steel bar is clamped between the symmetrical middle clamps 305 by the loading robot arm. The centering device drives the two brackets 2 304 to move closer to each other, so that the two symmetrical middle clamps 305 clamp and fix the center of the U-shaped bend of the anchor steel bar, the two symmetrical upper clamps 306 clamp and fix the upper part of the anchor steel bar, and the two symmetrical lower clamps 307 clamp and fix the lower part of the anchor steel bar, that is, the three-point stable clamping and fixing mode of the anchor steel bar is completed. Among them, the main function of the centering device is to drive the two brackets 2 304 to move in opposite directions, that is, to move closer or farther away synchronously. Its structure can adopt the same driving structure as the auxiliary table 102, that is, a structure in which the forward and reverse rotating screws and the motor are combined, or it can adopt a structure in which two symmetrically arranged cylinders or electric push rods are synchronously driven in opposite directions.

[0026] It should be noted that the connecting rod member 308 is a conventional connecting rod structure, and the rotating shafts of the two turning points in the middle are slidably connected inside the middle clamp 305, and the rotating shafts of the two turning points are penetrated and threadedly connected with an adjusting threaded rod. By rotating the adjusting threaded rod, the spacing between the two turning points can be adjusted. When the threaded rod does not rotate, it has a self-locking function to keep the spacing between the two turning points fixed. The rotating shafts of the upper and lower turning points of the connecting rod member 308 are respectively fixedly connected to the upper clamp 306 and the lower clamp 307, and then the spacing between the upper clamp 306 and the lower clamp 307 is changed by changing the spacing between the two turning points. Finally, the purpose of adjusting the spacing between the upper clamp 306 and the lower clamp 307 according to the actual size of the anchor steel bar is achieved, so as to clamp and fix anchor steel bars of various specifications.

[0027] After completing the three-point fixation of the anchor steel bar, cylinder three 325 pushes the support plate 320 to move toward the main table surface 101. After a certain displacement distance, the support plate 320 drives the slide 319 to move until it conflicts with the middle clamp 305 and continues to push. Then, the mounting plate 301 is driven to move toward the main table surface 101 and finally moves to the preset position. The preset position is set according to the actual size of the anchor steel bar. At this time, the latch 315 is also inserted into the limit groove 324 of the turntable 322. At the same time, the two welding heads 314 on both sides are also close to and point to the conflict position between the anchor steel bar and the expansion joint prefabricated part. Similarly, the welding head 314 is connected to the welding equipment through a connecting pipe. During welding, the welding equipment is started, and the motor 323 drives the turntable 322 to rotate back and forth with a fixed amplitude in a positive and negative periodic manner, thereby driving the welding arm 313 to move along the trajectory of the arc groove 310, so that the welding head 314 rotates around the anchor steel bar, and performs rotational welding on the conflict position between the anchor steel bar and the contraction joint prefabricated part, so that the welding surfaces of the two welding heads 314 overlap and fully cover the entire welding trajectory.

[0028] It should be noted that after the two upper clamps 306 clamp the upper part of the anchoring steel bar, the center of the semi-circular support 309 coincides with the axis of the upper part of the anchoring steel bar at this time. That is, when the turntable 322 drives the second welding arm 313 and the second welding head 314 to rotate, the center of rotation coincides with the axis of the upper part of the anchoring steel bar, so that the second welding head 314 welds around the contact position between the anchoring steel bar and the precast expansion joint.

[0029] At the same time, the second cylinder 318 pushes the third welding arm 316 to move, so that the third welding head 317 faces and approaches the position where the anchoring steel bar contacts the anchoring plate. Similarly, the third welding head 317 is connected to the welding equipment through a connecting pipe. During welding, the welding equipment is started, and the third welding head 317 continuously moves to complete the coverage of the entire welding area.

[0030] After the welding of the anchoring steel bar is completed, the centering device drives the two second brackets 304 to move away from each other, and contacts and clamps and fixes the anchoring steel bar. The third cylinder 325 pulls the support plate 320 to move away from the main table 101, so that the sliding table 319 is separated from the middle clamp 305. Furthermore, the mounting plate 301 moves away from the main table 101 and resets under the action of the first spring 302. At the same time, the pin 315 is withdrawn from the limit groove 324, and finally the entire second welding mechanism 3 resets.

[0031] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A welding and processing device for road and bridge expansion joints, comprising a workbench (1), characterized in that, On both sides of the workbench (1), a first welding station and a second welding station are sequentially arranged. On the upper surface of the workbench (1), a conveying and clamping mechanism is provided. The conveying and clamping mechanism is used to clamp and fix the expansion joint prefabricated parts, and drive the welding points to be welded of the expansion joint prefabricated parts to pass through the first welding station and the second welding station in sequence. A first welding mechanism (2) is arranged in the first welding station. The first welding mechanism (2) is used to weld the anchor plate to the bottom of the expansion joint prefabricated part. A second welding mechanism (3) is arranged in the second welding station. When the anchor reinforcement is clamped and moved to the second welding mechanism (3) by the loading robotic arm, the second welding mechanism (3) clamps and fixes the anchor reinforcement, and welds the two end parts of the anchor reinforcement to the outer wall of the expansion joint prefabricated part and the side wall of the anchor plate respectively.

2. The welding and processing device for the expansion joint of a road bridge according to claim 1, wherein The workbench (1) includes a main tabletop (101), and auxiliary tabletops (102) fixedly connected thereto symmetrically extend from the middle part of the main tabletop (101) to both sides.

3. A welding and processing device for a road and bridge expansion joint according to claim 2, characterized in that, The conveying and clamping mechanism includes a conveyor (4). The bottom wall of the conveyor (4) is fixedly connected to the upper surface of the main tabletop (101). A clamping device is fixedly connected to the conveying end of the conveyor (4). The expansion joint prefabricated parts are clamped and fixed by the clamping device.

4. A welding and processing device for a road and bridge expansion joint according to claim 3, characterized in that, The clamping device includes two symmetrically arranged bottom plates (5). The bottom wall of the bottom plate (5) is fixedly connected to the conveying end of the conveyor (4). One side of the bottom plate (5) horizontally extends towards the auxiliary tabletop (102). A clamping groove (501) is formed in the bottom plate (5). Pressure plates (502) are arranged on three side walls of the clamping groove (501) far from the auxiliary tabletop (102). The pressure plates (502) are fixedly connected to the inner side wall of the clamping groove (501) through electric push rods (503). An opening part (504) penetrating up and down is formed in the bottom wall of the clamping groove (501) close to the auxiliary tabletop (102). When welding, the expansion joint prefabricated part is clamped into the clamping groove (501), and the electric push rod (503) pushes the pressure plate (502) to clamp and fix three sides of the expansion joint prefabricated part. At the same time, the welding point to be welded on the bottom wall of the expansion joint prefabricated part is located directly above the opening part (504).

5. The welding and processing device for road and bridge expansion joints according to claim 2, characterized in that, The first welding mechanism (2) includes two symmetrically arranged first welding arms (201). A first welding head (202) is arranged at one end of the first welding arm (201), and the other end is fixedly connected to the top of a first support (203). The bottom of the first support (203) is slidably connected to the upper surface of the auxiliary tabletop (102). One side of the first support (203) far from the main tabletop (101) is fixedly connected to the output end of a first cylinder (204). The outer wall of the first cylinder (204) is fixedly connected to the outer wall of the auxiliary tabletop (102) through a first support column (205).

6. The welding and processing device for expansion joints of road bridges according to claim 2, characterized in that, The second welding mechanism (3) includes a mounting plate (301). The bottom wall of the mounting plate (301) is slidably connected to the upper surface of the auxiliary tabletop (102), and one side of the mounting plate (301) is connected to the auxiliary tabletop (102) by a first spring (302). The first spring (302) pushes the mounting plate (301) away from the main tabletop (101). A chute (303) is formed in the upper part of the mounting plate (301). Two symmetrically arranged second brackets (304) are slidably connected in the chute (303). The two second brackets (304) are driven by a centering device to move towards each other. A middle clamp (305) is fixedly connected to the upper part of the second bracket (304). An upper clamp (306) is arranged above the middle clamp (305), and a lower clamp (307) is arranged below the middle clamp (305). The upper clamp (306) and the lower clamp (307) are symmetrically arranged with the middle clamp (305) as the center, and the upper clamp (306) and the lower clamp (307) are respectively connected to the middle clamp (305) through link members (308). When the centering device drives the two second brackets (304) to move towards each other, the combination of the symmetrically arranged upper clamp (306), middle clamp (305), and lower clamp (307) clamps the anchoring steel bar in a three-point manner.

7. The welding and processing device for expansion joints of road bridges according to claim 6, wherein, Semicircular brackets (309) are respectively slidably connected to the opposite sides of the two upper clamps (306). An arc-shaped groove (310) is formed in the semicircular bracket (309). A slider (311) is slidably connected in the arc-shaped groove (310). The two sides of the slider (311) are respectively connected to the upper and lower inner walls of the arc-shaped groove (310) by second springs (312). The center of the slider (311) penetrates and is fixedly connected to a second welding arm (313). One end of the second welding arm (313) is provided with a second welding head (314), and the other end is fixedly connected to a retaining pin (315). A sliding table (319) is also slidably connected to the mounting plate (301). A support plate (320) is slidably connected to the upper part of the sliding table (319). A third spring (321) is arranged between the support plate (320) and the sliding table (319). The third spring (321) pushes the support plate (320) away from the main tabletop (101). A turntable (322) is rotatably connected to one side of the upper part of the support plate (320) facing the main tabletop (101), and a second motor (323) is fixedly connected to the other side. The output end of the second motor (323) penetrates the support plate (320) and is fixedly connected to the center of the turntable (322). A limiting groove (324) corresponding to the retaining pin (315) is formed on one side of the turntable (322) facing the main tabletop (101). The middle part of the support plate (320) is fixedly connected to the output end of a third cylinder (325). The outer wall of the third cylinder (325) is fixedly connected to the auxiliary tabletop (102) through a second support column (326).

8. A welding and processing device for a road and bridge expansion joint according to claim 7, characterized in that, One of the outer sidewalls of the lower fixture (307) is fixedly connected to a second cylinder (318). The output end of the second cylinder (318) is fixedly connected to two symmetrically arranged third welding arms (316). A third welding head (317) is provided at one end of the third welding arm (316) facing the main tabletop (101).

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