A protective tool for plate welding

Abstract

The application discloses a protective tool for plate welding, and relates to the technical field of plate welding, which comprises a track moving assembly, a main welding table, a sub workbench, a welding protection unit and a main control host computer. The track moving assembly comprises a sliding track and a suspended track arranged in a factory area. A plate fixing and conveying assembly is arranged on the suspended track. A mechanical hand welding gun and an auxiliary supporting welding assembly are arranged on the main welding table. A positioning supporting assembly is arranged on the sub workbench, which comprises a clamping track and a clamping table. The two opposite sides of the clamping table are provided with arc-shaped work surfaces. The arc-shaped work surfaces are embedded with arc-shaped moving plates. A driving assembly is arranged on the clamping table. A plate fixing and clamping assembly is arranged on the moving plate. The plate fixing and conveying assembly on the suspended track can fix and convey the plate to a welding position. The positioning supporting assembly can support and fix the plate. The plate is fixed firmly, the angle can be adjusted conveniently, the automation degree is high, and the welding efficiency is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of medium and heavy plate welding technology. Background Technology

[0002] Engineering steel plates can be classified into thin plates, medium-thick plates, and thick plates according to their thickness and application range. The standards for plate thickness classification vary depending on the field and the material. Medium-thick plates refer to a type of plate commonly used in engineering, with a thickness much smaller than the planar dimensions, ranging from 4.5mm to 25mm. Medium-thick plates are widely used in shipbuilding, construction, machinery manufacturing, and pressure vessel manufacturing, among other engineering fields. Welding is a crucial part of the industry's production process. Medium-thick plate materials are widely used in shipbuilding, construction, machinery manufacturing, and pressure vessel manufacturing industries. In the engineering machinery sector alone, their usage exceeds 60%, and in shipbuilding, the usage of medium-thick plates for some ship types reaches over 80%. Due to the significant proportion of medium-thick plate usage, welding is a major production process in these industries. For example, in the engineering machinery and shipbuilding industries, medium-thick plate welding accounts for 70% of the total welding work. Therefore, improving the welding efficiency of medium-thick plates is of great significance to improving the overall production efficiency of these industries.

[0003] In existing automated production, welding fixtures for medium and heavy plates are complex, resulting in unstable quality and significantly limiting welding efficiency. Traditional welding of medium and heavy plates often involves a track-moving table in conjunction with a rotating plane. Fixtures are then used on the rotating plane to fix the medium and heavy plate, allowing for adjustment of the plate's rotation angle. For example, Chinese utility model patent CN209754375U discloses a welding fixture for medium and heavy plates, including an operating table, a lifting mechanism, a crossbeam, and a fixing device. The fixed end of the lifting mechanism is fixedly connected to the operating table. The crossbeam is positioned above the operating table and connected to it via the lifting mechanism. Under the action of the lifting mechanism, the crossbeam moves closer to or further away from the operating table. The fixing device is used to fix the medium and heavy plate and includes a mounting rod, a supporting connecting rod, a pressure plate, and two measuring mechanisms. By setting the mounting rod, supporting connecting rod, pressure plate, and two measuring mechanisms at the end of the workpiece fixing device, the medium and heavy plate is ensured to be flat after being fixed on the welding fixture, improving the product yield.

[0004] The aforementioned existing technology ensures that medium and heavy plates are flat after being fixed on the welding fixture. However, since there are many specifications for medium and heavy plates, the fixing fixture often needs to be able to adjust the rotation angle and tilt angle of the medium and heavy plates while fixing them. Common medium and heavy plates, especially those used in ships or other special-shaped vessels, have a large area and long length. Conventional welding fixtures cannot meet the requirements of such oversized medium and heavy plates for fixing methods, welding angles, and welding protection. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a protective fixture for welding medium-thick plates. For large plates, especially long plates, it provides reliable fixation, convenient angle adjustment, and a high degree of automation, thereby greatly improving welding efficiency.

[0006] To achieve the above objectives, the present invention specifically adopts the following technical solution: a protective fixture for welding medium and heavy plates, comprising a track moving assembly, a main welding table, a secondary worktable, a welding protection unit, and a central control host. The track moving assembly includes a sliding track and a suspended track located in the factory area. The main welding table and the secondary worktable are both driven by motors to slide on the sliding track. A plate fixing and transmission assembly is provided on the suspended track. A robotic welding gun and an auxiliary support welding assembly are provided on the main welding table. A positioning support assembly is provided on the secondary worktable. The positioning support assembly includes a clamping track disposed on the upper surface of the secondary worktable and perpendicular to the sliding track. Clamping platforms are symmetrically slidably connected to the clamping track. Each clamping platform has an arc-shaped working surface on one side opposite to the other. An arc-shaped moving plate is embedded on the working surface. A driving assembly is provided on the clamping platform to cause the moving plate to slide circumferentially along the working surface. A plate fixing and clamping assembly is provided on the moving plate.

[0007] With the above scheme, when welding large plates, the plate fixing and conveying assembly on the suspended track fixes and transports the plate to the welding position. By setting up a positioning support assembly, the clamping table slides along the clamping track, and two moving plates move relative to each other. This means that both sides of the plate are clamped and fixed by the plate fixing clamping assembly, and auxiliary support welding assembly provides further support, completing the support and fixation of the plate. The robotic welding gun performs welding and surfacing, while a welding protection unit provides a protective atmosphere to improve welding quality. When the welding angle needs to be adjusted, the drive assembly moves the moving plates on both sides circumferentially along the working surface. The sliding mechanism causes the plate to rotate and adjust its angle. The two moving plates are driven by the drive assembly to rotate synchronously along the working surface. The clamping parts are on both sides of the medium-thick plate, reducing the limitation of the plate length. The angle adjustment is precise and quick. After part of the welding is completed, the plate can be fixed and transported to the next welding position through the plate fixing and transmission assembly on the suspended track. The above fixed welding angle adjustment steps are repeated to realize continuous and uninterrupted welding of long plates, which greatly improves the adaptability to welding medium-thick plates of different specifications. The suspended track saves ground space, is firmly fixed, and is convenient for angle adjustment. It has a high degree of automation and greatly improves welding efficiency.

[0008] Furthermore, the moving plate has an arc-shaped rack on its outer side wall along its length. The driving assembly includes several sets of rotating teeth on the working surface outside the moving plate. The rotating teeth mesh with the rack and are evenly distributed within the arc surface of the working surface. The clamping table has servo motors at the three rotating teeth on the working surface. The output shaft of the servo motor is connected to the adjacent rotating teeth. The working surface has several driven rollers that rotate and abut against the moving plate towards the center. The rotating teeth are equipped with motor-driven gear locking claws.

[0009] With the above scheme, the two moving plates are driven to rotate synchronously by the drive assembly. That is, the servo motor drives the rotating teeth to rotate, and the rack and the moving plates rotate synchronously along the working surface. In turn, the plate fixing and clamping assembly drives the plate to rotate synchronously. The angle adjustment is precise and convenient. At the same time, multiple sets of rotating teeth are set up, which work with gear locking claws. After the angle is adjusted, the gear locking claws engage with the rotating teeth to lock the moving plates, preventing the device from sliding and loosening, and improving safety.

[0010] Furthermore, the plate fixing and clamping assembly includes a mounting post inserted into the inner side surface of the moving plate. The mounting post has several different lengths and a receiving cavity is provided at the top of the mounting post. An electromagnetic claw clamping assembly is provided in the receiving cavity.

[0011] The above scheme allows for the installation of mounting columns of different lengths to accommodate medium-thick plates of different specifications. The electromagnetic claw clamping assembly inside the cavity can clamp the medium-thick plates, making the fixation convenient and reliable.

[0012] Furthermore, the electromagnetic claw clamping assembly includes an electromagnet lower clamping plate disposed at the lower end of the receiving cavity, the electromagnet lower clamping plate being electrically connected to the central control host, and an upper clamping plate disposed above the receiving cavity, with a rubber pad disposed below the upper clamping plate, and a plurality of clamping screws disposed at the upper end of the receiving cavity, the clamping screws being screwed to the upper clamping plate.

[0013] With the above solution, when the medium-thick plate is embedded in the upper clamping plate and the lower electromagnet clamping plate, the lower electromagnet clamping plate is activated to attract the plate, and at the same time, the abutment screw is rotated to cause the upper clamping plate to descend along the receiving cavity and clamp the plate. The rubber strip is set to prevent slipping and avoid scratching the plate. The operation is convenient and the fixation is reliable. Even if there is a sudden power failure, the plate can still be clamped by the upper clamping plate and the lower electromagnet clamping plate, which ensures high safety.

[0014] Furthermore, the auxiliary support welding assembly includes a plurality of support rollers disposed on the upper surface of the main welding table along the material conveying direction, and a support mesh frame inserted and connected to the upper surface of the main welding table. Guide wheel assemblies are provided on both sides of the support mesh frame, and a slag leakage groove is provided below the support mesh frame on the main welding table.

[0015] The above scheme, with the support rollers and guide wheel assembly, can support the plate when it is laid flat and make it easy to push. At the same time, the support mesh frame facilitates heat dissipation during welding and allows waste residue to fall into the slag discharge trough.

[0016] Furthermore, both the main welding table and the auxiliary worktable are equipped with height-adjustable hydraulic lifting cylinders at their bottom ends.

[0017] The above solution allows for easy adjustment of the height of the main welding table and the auxiliary worktable by setting up a height-adjustable hydraulic lifting cylinder.

[0018] Furthermore, the plate fixing and conveying assembly includes two sets of overhead cranes mounted on the sliding rail. Each set of overhead cranes has two symmetrically arranged lifting machines. The lower end of the lifting cable on the lifting machine is provided with a plate fixing clamp arranged in an inverted "F" shape. The two plate fixing clamps are arranged opposite to each other. The plate fixing clamp includes an upper clamp plate and a lower clamp plate. The upper clamp plate and the lower clamp plate slide against each other. The upper clamp plate is provided with a tightening bolt that is screwed into the lower clamp plate.

[0019] With the above solution, when it is necessary to adjust the installation of the board, the lifting cable of the elevator is lowered, the upper and lower clamps are inserted into the side of the board, and the upper clamp is pressed down against the board by the abutment bolts. By symmetrically setting the elevator and board fixing clamps on both sides of the board, the board can be firmly fixed to the board fixing clamps, which facilitates lifting and lowering the board and makes it easy to move.

[0020] Furthermore, the welding protection unit includes a weld temperature monitoring component, which includes an infrared temperature probe located at the lower end of the robotic arm welding torch and a telescopic platform located at the lower end of the robotic arm welding torch. The top of the telescopic platform is provided with a rectangular hot flame nozzle, which is heated by gas. The infrared temperature probe and the hot flame nozzle are electrically connected to the central control host.

[0021] The above scheme allows for real-time monitoring of weld temperature by setting up an infrared temperature probe. For welding, this means that the weld can be preheated by the hot flame nozzle, or the semi-finished weld can be preheated when welding is interrupted and resumed. This reduces the problem of rapid temperature changes and uneven temperature distribution, which can easily lead to the formation of hardened martensite in the heat-affected zone of the weld, making the weld metal brittle and increasing the tendency for cold cracks.

[0022] The beneficial effects of this invention are as follows: 1. This invention is easy to operate. When welding large plates, the plate fixing and conveying assembly on the suspended track fixes and transports the plate to the welding position. By setting a positioning support assembly, the clamping table slides along the clamping track, and the two moving plates move relative to each other. That is, the two sides of the plate are clamped and fixed by the plate fixing clamping assembly, and at the same time, the auxiliary support welding assembly provides auxiliary support to complete the support and fixation of the plate. The robotic welding gun performs welding and surfacing, and at the same time, the welding protection unit provides a welding protective atmosphere to improve the welding quality. When it is necessary to adjust the welding angle, the driving assembly drives the moving plates on both sides to move along the designated angle. The working surface slides in a circle, causing the plate to rotate and adjust its angle. Two moving plates are driven by the drive assembly to rotate synchronously along the working surface. The clamping parts are on both sides of the medium-thick plate, reducing the limitation of the length of the medium-thick plate. The angle adjustment is precise and quick. After part of the welding is completed, the plate can be fixed and transported to the next welding position through the plate fixing and transmission assembly on the suspended track. The above fixed welding angle adjustment steps are repeated to realize continuous and uninterrupted welding of long plates, which greatly improves the adaptability to welding medium-thick plates of different specifications. The suspended track can save ground space, is firmly fixed, and is convenient for angle adjustment. It has a high degree of automation and greatly improves welding efficiency.

[0023] 2. The two moving plates are driven to rotate synchronously by the drive assembly. That is, the servo motor drives the rotating teeth to rotate, and the rack and moving plates rotate synchronously along the working surface. In turn, the plate fixing and clamping assembly drives the plate to rotate synchronously. The angle adjustment is precise and convenient. At the same time, multiple sets of rotating teeth are set up, which work with gear locking claws. After the angle is adjusted, the gear locking claws engage with the rotating teeth to lock the moving plates, preventing the device from sliding and loosening, and improving safety.

[0024] 3. An infrared temperature probe can be set up to monitor the weld temperature in real time. For welding, the weld can be preheated by the gas from the hot flame nozzle, or the semi-finished weld can be preheated when welding is interrupted and resumed. This reduces the problem of rapid temperature changes and uneven temperature distribution, which can easily cause hardened martensite structure to form in the heat-affected zone of the weld, making the weld metal brittle and increasing the tendency to produce cold cracks. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 This is a top view of the structure of the present invention;

[0027] Figure 3 yes Figure 2 Schematic diagram of the cross-sectional structure along line AA;

[0028] Figure 4 yes Figure 3 Enlarged structural diagram of section B.

[0029] Attached reference numerals: 1. Main welding table; 2. Auxiliary worktable; 3. Height-adjusting hydraulic lifting cylinder; 4. Sliding track; 5. Suspended track; 6. Robotic welding torch; 7. Clamping track; 8. Clamping table; 9. Working surface; 10. Moving plate; 11. Overhead crane; 12. Lifting machine; 13. Plate fixing clamp; 14. Upper clamping plate; 15. Lower clamping plate; 16. Tightening bolt; 17. Mounting column; 18. Receiving cavity; 19. Electromagnetic lower clamping plate; 20. Upper clamping plate; 21. Rubber pad; 22. Tightening screw; 23. Support roller; 24. Support mesh frame; 25. Guide wheel assembly; 26. Slag trough; 27. Rack; 28. Rotating gear; 29. ​​Servo motor; 30. Driven roller; 31. Gear locking claw; 33. Infrared temperature probe; 34. Telescopic table; 35. Heat flame nozzle. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0032] Example 1 Figures 1 to 4As shown, this embodiment provides a protective fixture for welding medium and heavy plates, including a track moving assembly, a main welding table 1, a secondary worktable 2, a welding protection unit, and a central control host. Both the main welding table 1 and the secondary worktable 2 are equipped with height-adjustable hydraulic lifting cylinders 3 at their bottom ends. The track moving assembly includes a sliding track 4 located in the factory area and a suspended track 5 parallel to the sliding track 4. Both the main welding table 1 and the secondary worktable 2 are driven by motors to slide on the sliding track 4. A plate fixing and transmission assembly is installed on the suspended track 5. A robotic welding torch 6 and auxiliary supports are installed on the main welding table 1. The welding assembly, including the robotic welding gun 6, is a commonly used welding robot and will not be described in detail. A positioning support assembly is provided on the auxiliary worktable 2. The positioning support assembly includes a clamping rail 7 set on the upper surface of the auxiliary worktable 2 and perpendicular to the sliding rail 4. A clamping table 8 is symmetrically slidably connected to the clamping rail 7. An arc-shaped working surface 9 is provided on each opposite side of the clamping table 8. An arc-shaped motion plate 10 is embedded in the working surface 9. A drive assembly is provided on the clamping table 8 to make the motion plate 10 slide circumferentially along the working surface 9. A plate fixing clamping assembly is provided on the motion plate 10.

[0033] Therefore, when welding large plates, the plate fixing and conveying assembly on the suspended track 5 fixes and transports the plate to the welding position. A height-adjustable hydraulic lifting cylinder 3 facilitates adjustment of the height of the main welding table 1 and the auxiliary worktable 2. A positioning support assembly is installed, and the clamping table 8 slides along the clamping track 7, causing the two moving plates 10 to move relative to each other. This means that both sides of the plate are clamped and fixed by the plate fixing clamping assembly, while auxiliary support welding assemblies provide additional support, thus completing the support and fixation of the plate. The robotic welding gun 6 performs welding and surfacing, while a welding protection unit provides a protective atmosphere to improve welding quality. When the welding angle needs to be adjusted, the drive assembly moves both sides... The moving plate 10 slides circumferentially along the working surface 9, thereby causing the plate to rotate and adjust its angle. The two moving plates 10 are driven by the drive assembly to rotate synchronously along the working surface 9. The clamping parts are on both sides of the medium-thick plate, reducing the limitation of the length of the medium-thick plate. The angle adjustment is precise and quick. After part of the welding is completed, the plate can be fixed and transported to the next welding position through the plate fixing and transmission assembly on the suspended track 5. The above fixed welding angle adjustment steps are repeated to realize continuous and uninterrupted welding of long plates, thereby greatly improving the adaptability to welding medium-thick plates of different specifications. The suspended track 5 can save ground space, is firmly fixed, and is convenient for angle adjustment. It has a high degree of automation and greatly improves welding efficiency.

[0034] To facilitate the transportation of the boards, a suspended track 5 and a board fixing and conveying assembly were specially installed, as shown in the reference. Figure 1The sheet metal fixing and conveying assembly includes two sets of overhead cranes 11 mounted on the sliding rail 4 (for ease of illustration, only one set of overhead cranes is shown in the figure; in reality, there are cranes on both sides of the suspended rail 5). The spacing between the two sets of overhead cranes 11 can be flexibly adjusted according to the length of the sheet metal. The overhead cranes 11 are controlled by a central control unit. Each set of overhead cranes 11 is symmetrically equipped with two lifting platforms 12. The lifting platforms 12 are equipped with lifting cables, and the lower end of the lifting cables on the lifting platforms 12 is equipped with sheet metal fixing clamps 13 arranged in an inverted "F" shape. The two sheet metal fixing clamps 13 are arranged opposite each other. The plate fixing clamp 13 includes an upper clamping plate 14 and a lower clamping plate 15. The upper clamping plate 14 and the lower clamping plate 15 slide against each other. The upper clamping plate 14 is provided with a tightening bolt 16 that screws into the lower clamping plate 15. When it is necessary to adjust the installation of the plate, the lifting cable of the lifting machine 12 is lowered, the upper clamping plate 14 and the lower clamping plate 15 are inserted into the side end of the plate, and the upper clamping plate 14 is forced to press against the plate downward by the tightening bolt. By symmetrically arranging the lifting machine 12 and the plate fixing clamp 13 on both sides of the plate, the plate can be firmly fixed in the plate fixing clamp 13, which facilitates lifting and lowering the plate and facilitates movement.

[0035] After the sheet metal is conveyed to the welding position using the sheet metal fixing and conveying assembly, the sheet metal can be fixed. (Refer to...) Figure 1 and Figure 3 and Figure 4 The plate fixing and clamping assembly includes a mounting post 17 inserted into the inner side plate of the moving plate 10. The mounting post 17 has several different lengths. A receiving cavity 18 is provided at the top of the mounting post 17. An electromagnetic claw clamping assembly is provided in the receiving cavity 18. The electromagnetic claw clamping assembly includes an electromagnet lower clamping plate 19 provided at the lower end of the receiving cavity 18. The electromagnet lower clamping plate 19 is electrically connected to the central control host. It also includes an upper clamping plate 20 provided above the receiving cavity 18. A rubber pad 21 is provided below the upper clamping plate 20. Several clamping screws 22 are provided at the upper end of the receiving cavity 18. The clamping screws 22 are screwed to the upper clamping plate 20. The installation columns 17 of different lengths are designed to accommodate medium-thick plates of different specifications. The electromagnetic claw clamping assembly in the receiving cavity 18 can clamp the medium-thick plate, making it easy and reliable to fix. When the medium-thick plate is embedded in the upper clamping plate 20 and the lower electromagnet clamping plate 19, the lower electromagnet clamping plate 19 is activated to attract the plate. At the same time, the abutment screw is rotated, causing the upper clamping plate 20 to descend along the receiving cavity 18 and clamp the plate. A rubber strip is provided to prevent slippage and avoid scratching the plate. The operation is convenient and the fixation is reliable. Even if there is a sudden power failure, the plate can still be clamped by the upper clamping plate 20 and the lower electromagnet clamping plate 19, which ensures high safety.

[0036] Reference Figure 1 and Figure 3 and Figure 4The auxiliary support welding assembly includes several support rollers 23 arranged on the upper surface of the main welding table 1 along the material conveying direction. In this embodiment, two support rollers 23 are provided. A support mesh frame 24 is also provided and inserted into the upper surface of the main welding table 1. Guide wheel groups 25 are provided on both sides of the support mesh frame 24. A slag leakage groove 26 is provided below the support mesh frame 24 on the main welding table 1. The support rollers 23 and the guide wheel groups 25 are provided to support the plate when it is laid flat and to facilitate pushing. At the same time, the support mesh frame is provided to facilitate welding heat dissipation and to facilitate the falling of waste slag into the slag leakage groove 26.

[0037] Reference Figure 1 and Figure 3 and Figure 4 After the plates are fixed, welding can be performed. When welding is complete or the welding angle is adjusted, the drive assembly drives the two moving plates 10 to rotate synchronously. The plate fixing and clamping assembly simultaneously drives the plates to rotate. (Refer to...) Figure 1 The motion plate 10 has an arc-shaped rack 27 on its outer wall along its length (only the position of the rack on the outer peripheral wall of the motion plate 10 is shown in the figure; its specific shape is not drawn). The drive assembly includes several sets of rotating teeth 28 on the working surface 9 outside the motion plate 10. The rotating teeth 28 mesh with the rack 27 and are evenly distributed within the arc surface of the working surface 9. The clamping table 8 has servo motors 29 at three locations on the working surface 9, at the upper, middle, and lower positions of the rotating teeth 28. The output shaft of the servo motor 29 is connected to the adjacent rotating teeth 28. The working surface 9 has several inward rotating contact points that abut against the center of the motion plate 10. The driven roller 30 and rotating teeth 28 are equipped with motor-driven gear locking claws 31. The two moving plates 10 are driven to rotate synchronously by the drive assembly, that is, the rotating teeth 28 are driven to rotate by the servo motor 29. The rack 27 and the moving plates 10 rotate synchronously along the working surface 9, thereby driving the plates to rotate synchronously through the plate fixing and clamping assembly. The angle adjustment is precise and convenient. At the same time, multiple sets of rotating teeth 28 are set up to cooperate with the gear locking claws 31. After the angle is adjusted, the gear locking claws 31 are engaged with the rotating teeth 28 to lock the moving plates 10, prevent the device from sliding and loosening, and improve safety.

[0038] Reference Figure 1To improve welding quality, the welding protection unit includes a weld temperature monitoring component. This component includes an infrared temperature probe 33 located at the lower end of the robotic welding torch 6, and a telescopic platform 34 located at the lower end of the robotic welding torch 6. A rectangular hot flame nozzle 35 is located at the top of the telescopic platform 34. The hot flame nozzle 35 is heated by gas. The infrared temperature probe 33 and the hot flame nozzle 35 are electrically connected to the central control unit. The welding protection unit provides a protective atmosphere for welding, improving welding quality. The infrared temperature probe 33 allows for real-time monitoring of the weld temperature. For welding, this allows for preheating of the weld through the gas from the hot flame nozzle 35, and also preheating of the semi-finished weld when welding is interrupted and resumed. This reduces the risk of rapid temperature changes and uneven temperature distribution, which can easily lead to the formation of hardened martensite in the heat-affected zone of the weld, making the weld metal brittle and increasing the tendency for cold cracking.

[0039] Implementation Principle: When welding large plates, the plate fixing and conveying assembly on the suspended track 5 fixes and transports the plate to the welding position. The lifting cable of the elevator 12 is lowered, and the upper clamping plate 14 and lower clamping plate 15 are inserted into the side of the plate. The upper clamping plate 14 is pressed downward against the plate by the abutment bolts, and the plate is fixedly transported to the welding position. By setting the positioning support assembly, the clamping table 8 slides along the clamping track 7, and the two moving plates 10 move relative to each other, that is, the two sides of the plate are clamped and fixed by the plate fixing clamping assembly. When the thick plate is embedded in the upper clamping plate 20 and the electromagnet lower clamping plate 19, the electromagnet lower clamping plate 19 is activated to attract the plate. At the same time, the abutment screw is rotated, causing the upper clamping plate 20 to descend along the receiving cavity 18 and clamp the plate. At the same time, the auxiliary support welding assembly provides auxiliary support to complete the support and fixation of the plate. The robotic welding gun 6 performs welding and surfacing. At the same time, the welding protection unit provides a welding protective atmosphere to improve the welding quality. When it is necessary to adjust the welding... When adjusting the angle, the drive assembly drives the two moving plates 10 on both sides to slide circumferentially along the working surface 9. The two moving plates 10 are driven to rotate synchronously by the drive assembly, that is, the servo motor 29 drives the rotating gear 28 to rotate. The rack 27, together with the moving plates 10, rotates synchronously along the working surface 9. Thus, the plate fixing clamping assembly synchronously drives the plate to rotate, thereby causing the plate to rotate and adjust the angle. The two moving plates 10 are driven by the drive assembly to rotate synchronously along the working surface 9. The clamping part is on both sides of the medium-thick plate, which reduces the limitation of the length of the medium-thick plate. The angle adjustment is precise and quick. After completing part of the welding, the plate can be fixed and transported to the next welding position through the plate fixing and transmission assembly on the suspended track 5. The above fixed welding angle adjustment steps are repeated to realize continuous and uninterrupted welding of long plates, which greatly improves the adaptability to welding medium-thick plates of different specifications. The suspended track 5 can save ground space, is firmly fixed, and is convenient for angle adjustment. It has a high degree of automation and greatly improves welding efficiency.

Claims

1. A protective fixture for welding medium-thick plates, characterized in that, The system includes a track-moving assembly, a main welding table (1), a secondary workbench (2), a welding protection unit, and a central control host. The track-moving assembly includes a sliding track (4) and a suspended track (5) located in the factory area. Both the main welding table (1) and the secondary workbench (2) are driven by motors to slide on the sliding track (4). A plate fixing and transmission assembly is provided on the suspended track (5). A robotic welding gun (6) and an auxiliary support welding assembly are provided on the main welding table (1). A positioning support assembly is provided on the secondary workbench (2). The positioning support assembly includes components installed on the secondary workbench. A clamping rail (7) is set perpendicularly to the sliding rail (4) on the upper end face of the worktable (2). A clamping platform (8) is symmetrically slidably connected to the clamping rail (7). An arc-shaped working surface (9) is provided on each opposite side of the clamping platform (8). An arc-shaped moving plate (10) is embedded in the working surface (9). A driving component is provided on the clamping platform (8) to make the moving plate (10) slide circumferentially along the working surface (9). A plate fixing clamping component is provided on the moving plate (10). An arc-shaped rack is provided on the outer wall of the moving plate (10) along the length direction. 27) The driving assembly includes several sets of rotating teeth (28) disposed on the working surface (9) outside the moving plate (10). The rotating teeth (28) mesh with the rack (27). The rotating teeth (28) are evenly distributed within the arc surface of the working surface (9). The clamping table (8) is provided with servo motors (29) at three locations on the working surface (9) where the rotating teeth (28) are located. The output shaft of the servo motor (29) is connected to the adjacent rotating teeth (28). The working surface (9) is provided with several rotating teeth that rotate towards the center of the moving plate (10). The driven roller (30) is connected, and the rotating tooth (28) is equipped with a gear locking claw (31) driven by a motor. The welding protection unit includes a weld temperature monitoring component. The weld temperature monitoring component includes an infrared temperature probe (33) located at the lower end of the robotic arm welding gun (6) and a telescopic platform (34) located at the lower end of the robotic arm welding gun (6). The top of the telescopic platform (34) is provided with a rectangular hot flame nozzle (35). The hot flame nozzle (35) is heated by gas. The infrared temperature probe (33) and the hot flame nozzle (35) are both electrically connected to the central control host.

2. The protective fixture for welding medium-thick plates according to claim 1, characterized in that, The plate fixing clamping assembly includes a mounting post (17) inserted into the inner side plate surface of the moving plate (10), and a receiving cavity (18) is provided at the top of the mounting post (17), and an electromagnetic claw clamping assembly is provided in the receiving cavity (18).

3. The protective fixture for welding medium-thick plates according to claim 2, characterized in that, The electromagnetic gripper assembly includes an electromagnet lower clamping plate (19) located at the lower end of the receiving cavity (18), the electromagnet lower clamping plate (19) being electrically connected to the central control host, and an upper clamping plate (20) located above the receiving cavity (18), with a rubber pad (21) below the upper clamping plate (20), and a plurality of clamping screws (22) located at the upper end of the receiving cavity (18), the clamping screws (22) being screwed to the upper clamping plate (20).

4. The protective fixture for welding medium-thick plates according to claim 1, characterized in that, The auxiliary support welding assembly includes a plurality of support rollers (23) arranged on the upper surface of the main welding table (1) along the material conveying direction, and a support mesh frame (24) inserted and connected to the upper surface of the main welding table (1). Guide wheel groups (25) are provided on both sides of the support mesh frame (24), and a slag leakage groove (26) is provided below the support mesh frame (24) of the main welding table (1).

5. A protective fixture for welding medium-thick plates according to claim 4, characterized in that, Both the main welding table (1) and the auxiliary worktable (2) are equipped with height-adjustable hydraulic lifting cylinders (3) at their bottom ends.

6. The protective fixture for welding medium-thick plates according to claim 1, characterized in that, The plate fixing and transmission assembly includes two sets of overhead cranes (11) mounted on the sliding rail (4). Each set of overhead cranes (11) is symmetrically equipped with two elevators (12). The lower end of the lifting cable on the elevator (12) is provided with a plate fixing clamp (13) arranged in an inverted "F" shape. The two plate fixing clamps (13) are arranged opposite to each other. The plate fixing clamp (13) includes an upper clamping plate (14) and a lower clamping plate (15). The upper clamping plate (14) and the lower clamping plate (15) slide against each other. The upper clamping plate (14) is provided with a tightening bolt (16) that is screwed into the lower clamping plate (15).

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