Bridge wet joint welding device and composite welding method thereof

Abstract

The invention relates to the technical field of metal cutting and welding equipment manufacturing, in particular to a bridge wet joint welding device and a composite welding method thereof.The bridge wet joint welding device comprises a prefabricated beam body, a reserved steel bar and a lap joint steel bar, the prefabricated beam body is rotationally in contact with a device shell, and a cleaning assembly is arranged at one end of the device shell and comprises a driving motor; the output end of the driving motor is fixedly connected with a rotating shaft, the bottom of the rotating shaft is fixedly connected with a grinding disc, the rotating shaft is fixedly connected with a first bevel gear, the first bevel gear is meshed with a second bevel gear, the second bevel gear is rotationally connected into a fixing plate, one side of the fixing plate is fixedly connected with a sleeve, and a nail hammer is slidably connected into the sleeve. According to the cleaning assembly, through transmission cooperation of the driving motor, the rotating shaft, the first bevel gear and the second bevel gear, power linkage of nail hammer knocking and grinding disc rotating is achieved, a multi-procedure cleaning structure is formed, slag, rust blocks and other impurities are effectively removed, it is guaranteed that the welding face is clean, and the welding quality is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal cutting and welding equipment manufacturing, in particular to a bridge wet joint welding device and a composite welding method thereof. BACKGROUND

[0002] Bridge wet joint welding is a core process in the splicing process of prefabricated bridge components. Its core role is to integrate scattered prefabricated components such as T-shaped beams and box beams into a whole force structure through reliable connection of steel connecting ends, and it is widely used in scenarios such as transverse splicing of main beams of steel structure bridges, steel-concrete composite beam bridges, upper and lower structure connection and accessory structure fixation.

[0003] The existing bridge wet joint welding process is too much and is mostly carried out in batches independently. The traditional process needs to complete multiple processes such as steel positioning, groove cleaning, spot welding fixing, layered welding, interlayer slag cleaning and final welding flaw detection in sequence. Frequent conversion of operation state and tools is required between processes, which cannot realize continuous construction, resulting in prolonged construction period, increased labor and equipment costs, and welding parameter fluctuations and construction interruptions caused by batch conversion, increasing the difficulty of quality control.

[0004] Therefore, a bridge wet joint welding device and a composite welding method thereof are proposed to solve the above problems. SUMMARY

[0005] The purpose of the present application is to provide a bridge wet joint welding device and a composite welding method thereof.

[0006] The purpose of the present application is achieved by the following technical scheme: a bridge wet joint welding device, comprising a prefabricated beam body, a reserved steel bar and a lapped steel bar, the reserved steel bar is fixedly connected with the prefabricated beam body, the prefabricated beam body is rotatably connected with a device housing, one end of the device housing is provided with a cleaning assembly, and the device housing is also provided with a conveying assembly;

[0007] The cleaning assembly comprises a driving motor, the output end of the driving motor is fixedly connected with a rotating shaft, the bottom of the rotating shaft is fixedly connected with a grinding disc, a bevel gear one is fixedly connected to the rotating shaft, a bevel gear two is meshed with the bevel gear one, the bevel gear two is rotatably connected in a fixed plate, one side of the fixed plate is fixedly connected with a sleeve, and a hammer is slidably connected in the sleeve.

[0008] Further, one side of the bevel gear two is fixedly connected with a driven ring, the driven ring is fixedly connected with a trigger column, one end of the driven ring is rotatably connected with a connecting rod, one end of the connecting rod is fixedly connected with a hinged seat, and the hinged seat is hingedly connected with a hammer.

[0009] Further, the bottom of the hammer is in contact with a reserved reinforcing bar, and the hammer is fixedly connected with a spring close to the bottom, and the other end of the spring is fixedly connected in the sleeve.

[0010] Further, the conveying assembly comprises a conveying belt, one end of the conveying belt is fixedly connected with a storage supporting block, and the conveying belt is rotatably connected with a rotating plate, one end of the rotating plate is provided with a fixing rod, and the rotating plate is rotatably connected with a rotating lever through the fixing rod, the rotating lever is rotatably connected with a fixing plate, and one side of the rotating lever is fixedly connected with a return spring, and the other end of the return spring is fixedly connected in the device shell.

[0011] Further, the storage supporting block is slidably connected with the device shell, and the storage supporting block is provided with a lapping reinforcing bar, and the device shell is provided with a conveying channel for facilitating the sliding of the lapping reinforcing bar; the bottom of the conveying channel is provided with a guide plate, and the guide plate is hingedly connected to one end of a sliding plate, and the sliding plate is slidably connected in the device shell.

[0012] Further, the top of the rotating lever is hingedly connected with a clamping jaw, and the top of the rotating lever is provided with a limiting plate for limiting the rotation of the clamping jaw, and the clamping jaw is in sliding contact with the fixing rod.

[0013] Further, the cleaning assembly and the rotating lever are symmetrically distributed in the device shell, and the bottom of the rotating lever is in contact with the reserved reinforcing bar.

[0014] Further, the device shell is further fixedly connected with a welding gun, and one side of the device shell corresponding to the welding gun is fixedly connected with a recycling plate.

[0015] Further, the device shell is provided with a notch for facilitating the welding process of the welding gun, and the device shell is provided with a steel wire brush which can move back and forth along the width direction of the device shell at positions corresponding to the two sides of the rotating shaft.

[0016] Compared with the prior art, the advantages of the present application are that:

[0017] 1、In the present application, the cleaning assembly realizes the power linkage of the hammer knocking and the rotation of the polishing disc through the transmission cooperation of the driving motor, the rotating shaft, the bevel gear one and the bevel gear two, forms a multi-process cleaning structure, effectively removes impurities such as slag and rust blocks, ensures the cleanliness of the welding surface, and improves the welding quality; the fixing plate provides stable support for the bevel gear two and the driven ring and the like, and ensures accurate and reliable transmission.

[0018] 2. In this invention, the conveying component relies on the conveyor belt and the placement block to realize the batch placement and conveying of lapped steel bars. Through the linkage triggering mechanism of the rotating lever, the return spring and the reserved steel bars, the automatic replenishment of steel bars after welding is realized. With the guidance and positioning of the sliding channel, the guide plate and the sliding plate, the lapped steel bars and the reserved steel bars are accurately connected, reducing manual intervention and improving work efficiency.

[0019] 3. In this invention, the recycling plate and the cleaning component work together to achieve centralized recycling of work waste, avoiding waste from scattering and polluting the construction environment and reducing on-site cleaning costs; the slots opened on the outer shell of the device provide operating space for welding torch welding, ensuring that welding operations can be carried out smoothly. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention.

[0021] Figure 2 This is a partial cross-sectional schematic diagram of Embodiment 1 of the present invention.

[0022] Figure 3 This is a schematic diagram of the cleaning component according to Embodiment 1 of the present invention.

[0023] Figure 4 This is a connection diagram of the conveyor belt in Embodiment 1 of the present invention.

[0024] Figure 5 This is a schematic diagram of the conveying component according to Embodiment 1 of the present invention.

[0025] Figure 6 This is a schematic diagram of the connection relationship of the guide plate in Embodiment 1 of the present invention.

[0026] Figure 7 This is a schematic diagram of the connection relationship of the recycling plates in Embodiment 1 of the present invention.

[0027] Figure 8 This is a schematic diagram of the cam-driven wire brush in Embodiment 2 of the present invention.

[0028] Labeling Explanation: 1-Precast beam; 2-Reserved reinforcing bar; 3-Layered reinforcing bar; 4-Equipment housing; 5-Cleaning assembly; 6-Recycling plate; 7-Conveying assembly; 8-Drive motor; 9-Rotating shaft; 10-Grinding disc; 11-Bevel gear one; 12-Bevel gear two; 13-Rotating ring; 14-Fixing plate; 15-Driven ring; 16-Trigger column; 17-Connecting rod; 18-Hinge seat; 19-Hammer; 20-Sleeve; 21-Spring; 22-Conveyor belt; 23-Placement block; 24-Rotating plate; 25-Fixing rod; 26-Rotating lever; 27-Reset spring; 28-Conveying channel; 29-Guide plate; 30-Sliding plate; 31-Claw; 32-Welding gun; 33-Wire brush. Detailed Implementation

[0029] The present invention will now be described in detail with reference to the accompanying drawings and embodiments:

[0030] Example 1

[0031] like Figures 1 to 7 The diagram shown is an embodiment of a bridge wet joint welding device and its composite welding method provided by the present invention.

[0032] A bridge wet joint welding device comprises three main components: a precast beam 1, pre-reserved reinforcing bars 2, and lapped reinforcing bars 3. The pre-reserved reinforcing bars 2 are pre-fixed to the wet joint of the precast beam 1, forming a stable connection structure. A rolling outer shell 4 is mounted on the top surface of the precast beam 1. This shell can move at a constant speed along the pre-reserved wet joint gap of the precast beam 1, providing a convenient mobile carrier for welding operations. During the movement of the device, each functional component operates sequentially in the following order: "welding completion at the front end—hammer 19 striking—wire brush 33 cleaning—grinding with grinding disc 10—final cleaning with wire brush 33." One end of the outer shell 4 is equipped with a cleaning component 5 for pre-treating the reinforcing bars, while the bottom of the other end is fixedly connected to a recycling plate 6. Rust, impurities, and welding slag removed by the cleaning component 5 during operation fall into the recycling plate 6 under gravity for centralized collection. Simultaneously, the outer shell 4 also integrates a conveying component 7 for transporting the lapped reinforcing bars 3, achieving automatic supply of the lapped reinforcing bars 3. The precast beam 1 provides the installation foundation for the device, the reserved steel bars 2 are the core welding components, the outer shell 4 of the device supports various functional components, the cleaning component 5 ensures the cleanliness of the steel bar welding surface, the conveying component 7 realizes the orderly supply of lapped steel bars 3, and the recycling plate 6 avoids waste pollution of the construction environment and facilitates centralized treatment.

[0033] The core power source of the cleaning component 5 is the drive motor 8, which provides stable power to the entire cleaning component 5. Its output end is rigidly connected to the rotating shaft 9, driving the rotating shaft 9 to rotate at high speed. As a key power transmission component, the rotating shaft 9 transmits power to the bottom grinding disc 10 on one hand, and to the bevel gear 11 in the middle on the other.

[0034] As the device moves along the wet joint, after the welding torch 32 at the front end completes a section of welding, the hammer 19 first strikes the welded area between the reserved reinforcing bar 2 and the lapped reinforcing bar 3. This striking removes slag and flux residue from the weld surface and removes stubborn rust from the surface of the reserved reinforcing bar 2. As the device moves forward, the grinding disc 10 at the bottom of the rotating shaft 9 contacts the welded area on the reserved reinforcing bar 2, eliminating localized protrusions formed by welding through rotational grinding, thus ensuring a smooth transition between the weld and the base material. A bevel gear 11 is fixedly mounted in the middle of the rotating shaft 9. Bevel gear 11 meshes with bevel gear 12 to form a vertical transmission mechanism, transmitting power by converting the power direction into the striking action of the hammer 19. The shaft of bevel gear 12 passes through the fixed plate 14 and is rotatably connected to the rotating ring 13. The shaft of bevel gear 12 is rotatably installed in the internal hole of the fixed plate 14. The fixed plate 14 provides stable support for bevel gear 12, ensuring the stable operation of bevel gear 12, thereby ensuring the precise transmission and reliable operation of the cleaning component 5.

[0035] The fixing plate 14 is securely installed in the internal cavity of the device housing 4. Besides supporting the bevel gear 12, it also provides mounting support for the driven ring 15. One side of the plate is rotatably connected to the driven ring 15 via a bearing, allowing the driven ring 15 to rotate freely within the fixing plate 14. A trigger pin 16 for triggering the hammering action is fixed to the protruding part of the driven ring 15. The driven ring 15 receives power through the trigger pin 16, and its end away from the trigger pin 16 is rotatably connected to one end of the connecting rod 17, driving the connecting rod 17 to move. The other end of the connecting rod 17 is fixed integrally with the hinge seat 18, transmitting power through the connecting rod 17 to cause the hammer 19 to rotate around the hinge seat 18. The hammer 19 is hinged inside the hinge seat 18 via a pin. The working end of the hammer 19 is in close contact with the surface of the pre-reserved reinforcing bar 2, allowing it to strike the reinforcing bar. The hammer 19 slides through the inside of the sleeve 20, which is fixed to the fixed plate 14 by a fixing block. The sleeve 20 restricts the movement trajectory of the hammer 19, providing a stable sliding guide and preventing it from deviating during the hammering process. A spring 21 is also fixedly connected inside the sleeve 20. The other end of the spring 21 is fixed to the end ring of the hammer 19. When the hammer 19 is moved under force, the spring 21 will undergo elastic deformation. When the rotating ring 13 drives the driven ring 15 to rotate a certain angle through the trigger pin 16, the elastic force of the spring 21 will push the hammer 19 down, providing hammering power for the hammer 19, thereby completing a full hammering of the welded part.

[0036] The conveying assembly 7 uses the conveyor belt 22 as its core conveying structure. Multiple support blocks 23 for holding lapped reinforcing bars 3 are fixed on one side of the assembly facing the center of the outer casing 4. Operators can place batches of lapped reinforcing bars 3 to be welded onto the support blocks 23. The bottom of the support block 23 is slidably connected to the outer casing 4, and one end of the support block 23 is fixedly connected to the conveyor belt 22 via a connector. The conveyor belt is rotatably connected to the inner casing 4 via rotating rollers. Rotating plates 24 are fixedly connected to both ends of one of the rotating rollers. Several laterally extending fixed rods 25 are fixed on the side of the rotating plate 24 away from the support blocks 23. The fixed rods 25 are key transmission components that trigger the conveying action. When the conveyor belt 22 moves, the fixed rods 25 contact one end of a rotating lever 26, and the conveying process is started by rotating the lever 26.

[0037] The rotating lever 26 is rotatably mounted on the fixed plate 14 via a rotating shaft, forming a flexibly flip-up triggering mechanism. One end of the rotating lever 26 near its top is fixed to one end of the return spring 27, while the other end of the return spring 27 is fixed to the inner wall of the device housing 4. A flexibly rotatable pawl 31 is also provided on the top of the side of the rotating lever 26 where the return spring 27 is fixedly connected. A limiting baffle is also provided on the top of the pawl 31 to restrict its rotation angle. The return spring 27 ensures that the rotating lever 26 can quickly reset after being triggered, thereby pushing the fixed rod 25 to drive the rotating plate 24 and the conveyor belt 22 forward, realizing the automatic conveying of the lapped reinforcing bars 3. The specific linkage process of the triggering mechanism is as follows: After a lapped steel bar 3 is welded, the device moves forward as a whole. The reserved steel bar 2 will block the rotating lever 26, forcing the rotating lever 26 to rotate around the axis. At this time, the return spring 27 is stretched and stores elastic potential energy. The claw 31 rotates towards the rotating lever 26 under the pressure of the fixed rod 25. When the rotating lever 26 moves with the device to pass the reserved steel bar 2, the return spring 27 releases potential energy, causing the rotating lever 26 to swing back quickly. The claw 31 returns to its initial state and firmly locks the fixed rod 25 under the action of the limit baffle. Through the action of the return spring 27 and the claw 31, the fixed rod 25 can rotate at a certain angle. The rotation of the fixed rod 25 causes the rotating plate 24 to start the conveyor belt 22, which smoothly transports the lapped steel bar 3 on the next placement block 23 to the subsequent structure.

[0038] To ensure precise connection of the lapped reinforcing bars 3 from the conveyor belt 22 to the welding position, a conveying channel 28 is provided inside the device housing 4. One end of the conveying channel 28 is connected to the output end of the conveyor belt 22, and the other end is equipped with a guide plate 29 for receiving the lapped reinforcing bars 3 sliding down the channel. The bottom of the guide plate 29 is hinged to the sliding plate 30, and the guide plate 29 and the sliding plate 30 are arranged at an acute angle. The acute angle arrangement can guide the lapped reinforcing bars 3 to slide smoothly along the guide plate 29 to the angle positioning point between the two. After the conveyor belt 22 smoothly delivers the lapped reinforcing bars 3 from the placement block 23, the reinforcing bars can slide directly down the conveying channel 28 by their own gravity to the angle between the guide plate 29 and the sliding plate 30. To ensure smooth sliding of the reinforcing bars, a lubricating coating is applied to all parts of the device housing 4 and the conveying channel 28 that come into contact with the reinforcing bars. The sliding plate 30 is slidably connected to the outer shell 4 of the device via a guide groove. The sliding plate 30 can slide back and forth along the guide groove. By finely adjusting the position of the sliding plate 30, the placement posture of the lapped steel bar 3 can be precisely adjusted to ensure that the lapped steel bar 3 always maintains a tight fit with the reserved steel bar 2 during the welding process. After a lapped steel bar 3 is welded, the device moves forward with the overall operation progress. The welded lapped steel bar 3 will exert pressure on the guide plate 29, forcing the guide plate 29 to rotate around the hinge point at a certain angle. After the device moves to the point where the guide plate 29 is out of the pressure range of the welded steel bar, the guide plate 29 automatically returns to its initial position. At this time, the next lapped steel bar 3 just slides out from the conveying channel 28 and enters the receiving area of ​​the guide plate 29 to continue the subsequent welding process.

[0039] The middle and bottom of the device housing 4 are respectively provided with slots to facilitate welding and pulleys to facilitate the movement of the device on the surface of the precast beam 1. A welding torch 32 is fixedly installed on the top side of the device housing 4 using fasteners such as clips. The welding torch 32 is the core component for welding the reinforcing bars, directly completing the welding of the joint. Multiple reinforcing ribs are provided at the connection between the device housing 4 and the recycling plate 6. These ribs enhance the structural strength of the connection between the device housing 4 and the recycling plate 6, preventing loosening of the connection due to stress during long-term use.

[0040] Example 2

[0041] This Example 2 is a further supplement and explanation of Example 1.

[0042] refer to Figure 3 and Figure 8A steel wire brush 33 is installed at both ends of the rotating shaft 9 along the length of the device housing 4, forming a two-stage cleaning structure. The front steel wire brush 33, closer to the hammer 19, is activated first, performing a preliminary cleaning of the surface of the reserved reinforcing bar 2 after the hammer 19 removes impurities. After the grinding disc 10 completes fine grinding, the rear steel wire brush 33, closer to the grinding disc 10, performs a final cleaning of the reinforcing bar surface to ensure that there are no residual impurities on the welded surface. Both sets of steel wire brushes 33 are slidably installed inside the device housing 4 via guide grooves and can be triggered by mechanisms such as cams to perform back-and-forth cleaning actions. As the steel wire brush 33 moves back and forth along the width of the device housing 4, its bristles are in close contact with the surface of the reserved reinforcing bar 2, adapting to reinforcing bars of different diameters. The two movable wire brushes 33, along with the hammer 19 and grinding disc 10, form a complete multi-dimensional cleaning system that thoroughly removes rust, dust, and grinding residue from the surface of the reinforcing bars. All the removed debris eventually falls into the recycling plate 6. At the same time, the secondary cleaning by the wire brushes 33 can further improve the cleanliness of the reinforcing bar surface, enhance the welding bond between the reinforcing bars, and ensure the welding quality.

[0043] Working principle: The outer shell 4 of the device is rolled on the precast beam 1 and moves along the direction of the wet joint, supporting functional components such as the cleaning component 5 and the conveying component 7. At the same time, the recycling plate 6 at the bottom of the other end of the outer shell 4 realizes the centralized collection of waste materials. When the device is working, it forms a "welding-cleaning-reinforcement replenishment" linkage process. That is, after the welding torch 32 completes a section of welding, the cleaning component 5 sequentially performs knocking, sweeping, grinding and fine cleaning operations. Simultaneously, the conveying component 7 automatically replenishes the next lapped rebar 3. All the slag generated by the operation falls to the recycling plate 6, realizing continuous operation.

[0044] The cleaning component 5 uses the drive motor 8 as its power source and transmits power through the rotating shaft 9. On the one hand, it drives the grinding disc 10 to rotate and smooth the weld seam. On the other hand, it drives the driven ring 15, trigger post 16, and connecting rod 17 to drive the hammer 19 to complete the hammering through the vertical transmission of bevel gear 11 and bevel gear 22. The conveying component 7 uses the conveyor belt 22 and the placement block 23 to support the lapped steel bars 3. The reserved steel bar 2 triggers the rotating lever 26 to rotate and stretches the return spring 27 to store energy. When the return spring 27 rebounds, the claw 31 engages and pushes the fixed rod 25 and the rotating plate 24 to drive the conveyor belt 22 to rotate, sending the lapped steel bars 3 to the conveying channel 28. Then, the guide plate 29 and the sliding plate 30 cooperate to achieve precise positioning and ensure smooth docking with the reserved steel bars 2.

[0045] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A bridge wet joint welding device, comprising a prefabricated beam body (1), a reserved steel bar (2) and a lap steel bar (3), characterized in that: The reserved steel bar (2) is fixedly connected with the prefabricated beam body (1), the prefabricated beam body (1) is in rotary contact with the device shell (4), one end of the device shell (4) is provided with a cleaning assembly (5), and the device shell (4) is further provided with a conveying assembly (7) therein. The cleaning assembly (5) comprises a driving motor (8), the output end of the driving motor (8) is fixedly connected with a rotating shaft (9), the bottom of the rotating shaft (9) is fixedly connected with a polishing disc (10), and the rotating shaft (9) is fixedly connected with a bevel gear I (11) thereon, the bevel gear I (11) is meshed with a bevel gear II (12), the bevel gear II (12) is rotatably connected in a fixed plate (14), one side of the fixed plate (14) is fixedly connected with a sleeve (20), and the sleeve (20) is slidably connected with a hammer (19).

2. A bridge wet joint welding apparatus according to claim 1, characterized in that: One side of the bevel gear II (12) is fixedly connected with a driven ring (15), the driven ring (15) is fixedly connected with a trigger column (16), and one end of the driven ring (15) is rotatably connected with a connecting rod (17), one end of the connecting rod (17) is fixedly connected with a hinged seat (18), and the hinged seat (18) is hingedly connected with the hammer (19).

3. A bridge wet joint welding apparatus as defined in claim 1, wherein: The bottom of the hammer (19) is in contact with the reserved steel bar (2), and the hammer (19) is fixedly connected with a spring (21) close to the bottom, and the other end of the spring (21) is fixedly connected in the sleeve (20).

4. The bridge wet joint welding apparatus of claim 1, wherein: The conveying assembly (7) comprises a conveyor belt (22), one end of the conveyor belt (22) is fixedly connected with a storage supporting block (23), and the conveyor belt (22) is rotatably connected with a rotating plate (24), one end of the rotating plate (24) is provided with a fixed rod (25), and the rotating plate (24) is in contact with a rotating lever (26) through the fixed rod (25), the rotating lever (26) is rotatably connected to the fixed plate (14), and one side of the rotating lever (26) is fixedly connected with a return spring (27), and the other end of the return spring (27) is fixedly connected in the device shell (4).

5. A bridge wet joint welding apparatus as claimed in claim 4, wherein: The storage supporting block (23) is slidably connected with the device shell (4), and the storage supporting block (23) is provided with a lapping steel bar (3), and the device shell (4) is provided with a conveying channel (28) for facilitating sliding of the lapping steel bar (3); the bottom of the conveying channel (28) is provided with a guide plate (29), the guide plate (29) is hingedly connected to one end of the bottom of a sliding plate (30), and the sliding plate (30) is slidably connected in the device shell (4).

6. A bridge wet joint welding apparatus as claimed in claim 5, wherein: The top of the rotating lever (26) is hingedly connected with a pawl (31), and the top of the rotating lever (26) is provided with a limiting plate for limiting rotation of the pawl (31), and the pawl (31) is in sliding contact with the fixed rod (25).

7. A bridge wet joint welding apparatus as defined in claim 1, wherein: The cleaning assembly (5) and the rotating lever (26) are symmetrically distributed in the device shell (4), and the bottom of the rotating lever (26) is in contact with the reserved steel bar (2).

8. The bridge wet joint welding apparatus of claim 1, wherein: A welding gun (32) is fixedly connected in the device shell (4), and a recycling plate (6) is fixedly connected to the bottom of the side of the device shell (4) corresponding to the welding gun (32).

9. A bridge wet joint welding apparatus as defined in claim 4, wherein: A notch is formed in the device shell (4) to facilitate the welding process of the welding gun (32), and a steel wire brush (33) is arranged on both sides of the device shell (4) corresponding to the rotating shaft (9) and can move back and forth along the width direction of the device shell (4).

10. The composite welding method of the bridge wet joint welding device according to any one of claims 1-7, comprising the following steps: S1, place the device shell (4) on the top surface of the precast beam body (1) and adjust the bottom pulley so that it can smoothly move along the wet joint, check the reinforcing ribs at the connection part of the device shell (4) and the recycling plate (6) to ensure that there is no looseness, then start the conveying assembly (7) and the cleaning assembly (5) to ensure normal function; S2, stack the lap steels (3) to be welded in each storage block (23) according to specifications to ensure that the steel stack in each storage block (23) is stable and avoids the risk of falling, and place a lap steel (3) to be welded in the clamping mechanism of the guide plate (29) and the sliding plate (30); S3, start the device power source, drive the device to move along the wet joint at a preset speed, adjust the sliding plate (30) to the initial welding position, and the worker holds the welding gun (32) to weld the joint part of the reserved steel (2) and the lap steel (3) first; S4, during the movement of the device, the drive motor (8) drives the hammer (19) to knock the welding part to remove the slag, then the front steel wire brush (33) sweeps the residual impurities, then the polishing disc (10) rotates at high speed to smooth the welding protrusion, and the rear steel wire brush (33) performs the final cleaning, and all slag falls to the recycling plate (6); simultaneously, as the device advances, the return spring (27) releases potential energy to drive it to swing back and push the fixed rod (25), the rotating plate (24), and then drive the conveyor belt (22) to convey the next lap steel (3) to the conveying channel (28), and the lap steel (3) slides along the conveying channel (28) to between the guide plate (29) and the sliding plate (30), waiting for the next round of welding; S5, the device continues to move along the wet joint, and the welding in S3 and the knocking-cleaning-polishing-re-cleaning and automatic steel feeding and replacement linkage process in S4 are repeated until the whole wet joint welding operation is completed, then all power sources of the device are turned off, the recycling plate (6) is disassembled to collect the rust blocks and slag collected inside, and the welding gun (32), the steel wire brush (33), the polishing disc (10), the hammer (19), and the conveyor belt (22) are cleaned.

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