A cover plate welding apparatus, system, and method for a u-ribbed floor unit

Abstract

This invention provides a sealing plate welding apparatus, system, and method for a U-rib plate unit. The sealing plate welding apparatus for the U-rib plate unit includes: a frame, a moving mechanism, and a welding mechanism; the moving mechanism is connected to the frame, and the welding mechanism is connected to the moving mechanism; the moving mechanism is used to drive the welding mechanism to move; the welding mechanism is used to weld the U-rib sealing plate. The sealing plate welding apparatus, system, and method for the U-rib plate unit provided by this invention can improve the sealing plate welding efficiency and welding quality.

Description

Technical Field

[0001] This invention relates to welding technology, and more specifically to a sealing plate welding device, system, and method for U-rib plate units. Background Technology

[0002] Modern large bridges typically utilize steel box girder structures, primarily used to provide support and prevent bridge deformation. A steel box girder is generally constructed from components such as a top plate, a bottom plate (steel plate), and closed ribs (U-ribs), connected by full welding. The bottom plate and closed ribs form a U-rib plate unit structure. At both ends of the U-rib plate unit structure, sealing plates are welded. The cross-sectional contour of the sealing plates matches the internal contour of the U-rib and is welded to the ends of the U-rib, serving a sealing, waterproofing, and rustproofing function. Currently, the welding of the U-rib sealing plates is all done manually, which is inefficient but also inefficient due to high labor costs, thus failing to generate good economic benefits. Summary of the Invention

[0003] In view of the above-mentioned defects or improvement needs of the prior art, the present invention provides a sealing plate welding device, system and method for U-rib plate unit, which can improve welding efficiency and welding quality.

[0004] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0005] In one embodiment, a sealing plate welding device for a U-rib plate unit is provided. The sealing plate welding device for the U-rib plate unit includes: a frame, a moving mechanism, and a welding mechanism; the moving mechanism is connected to the frame, and the welding mechanism is connected to the moving mechanism. The moving mechanism is used to drive the welding mechanism to move; the welding mechanism is used to weld the U-rib sealing plate.

[0006] In one embodiment, the moving mechanism includes a lateral moving mechanism and a vertical moving mechanism. The lateral moving mechanism includes a lateral guide rail, and the vertical moving mechanism includes a vertical guide rail. The vertical guide rail is connected to the lateral guide rail, and the vertical guide rail can move laterally along the lateral guide rail. The welding mechanism can move vertically along the vertical guide rail.

[0007] In one embodiment, the moving mechanism further includes a longitudinal moving mechanism that can drive the welding mechanism to move longitudinally, where the longitudinal direction is the length direction of the U-rib of the U-rib plate unit.

[0008] In one embodiment, the longitudinal moving mechanism includes a longitudinal moving frame connected to the frame, and the transverse moving mechanism has a transverse guide rail disposed on the longitudinal moving frame.

[0009] In one embodiment, the welding mechanism includes a welding torch positioning mechanism, which includes a rotating shaft for fitting against the inner contour of the U-rib where the sealing plate to be welded is located.

[0010] In one embodiment, the welding torch positioning mechanism further includes a rotary drive mechanism connected to the moving mechanism, the rotary drive mechanism being used to drive the rotating shaft to rotate.

[0011] In one embodiment, the sealing plate welding device further includes a U-rib plate unit positioning structure, which includes a U-rib positioning structure, a steel plate vertical positioning structure, and a steel plate longitudinal positioning structure. The U-rib positioning structure is used to define the position of the sealing plate welding device and the U-rib where the sealing plate to be welded is located. The steel plate vertical positioning structure is used to define the vertical position of the sealing plate welding device and the steel plate of the U-rib plate unit. The steel plate longitudinal positioning structure is used to define the longitudinal position of the sealing plate welding device and the steel plate of the U-rib plate unit.

[0012] In one embodiment, the frame includes two fixed arms, the U-rib positioning structure includes at least one side plate connected to the fixed arms of the frame, the side plate having the same inclination angle as the outer surface of the U-rib for fitting against the outer surface of the U-rib; the steel plate vertical positioning structure includes a steel plate vertical fitting surface; preferably, the steel plate vertical fitting surface is the lower edge of the fixed arm of the frame; the steel plate longitudinal positioning structure includes a steel plate longitudinal fitting surface; preferably, the steel plate longitudinal fitting surface is located below the frame.

[0013] In one embodiment, the sealing plate welding device includes a fixing mechanism connected to the frame for fixing the sealing plate welding device to the U-rib plate unit.

[0014] In one embodiment, the fixing structure includes a clamping plate, which is disposed opposite to the vertical contact surface of the steel plate, and the clamping plate has a threaded hole through which a screw abuts against the steel plate; the fixing structure also includes a fixing plate, which is disposed opposite to the side plate, and the fixing plate has a threaded hole through which a screw abuts against the outer surface of the U-rib.

[0015] In another aspect, this application also provides a sealing plate welding system for a U-rib plate unit. The sealing plate welding system includes a sealing plate welding device as described in any of the preceding claims. The sealing plate welding system further includes a moving platform. The sealing plate welding device is connected to the moving platform. The moving platform includes a horizontal moving mechanism and a lifting mechanism for moving the sealing plate welding device to the sealing plate to be welded.

[0016] In one embodiment, the mobile platform is a forklift device.

[0017] In another aspect, this application also provides a sealing plate welding method for a U-rib plate unit, the sealing plate welding method comprising welding using a sealing plate welding device as described in any of the preceding claims or welding using a sealing plate welding system as described in any of the preceding claims.

[0018] The sealing plate welding device, system, and method of this application can improve welding efficiency and ensure welding quality. The sealing plate welding device of this application includes: a frame, a moving mechanism, and a welding mechanism; the moving mechanism is connected to the frame, and the welding mechanism is connected to the moving mechanism; the moving mechanism is used to drive the welding mechanism to move; the welding mechanism is used to weld the U-rib sealing plate, which can realize automatic welding of the sealing plate, improve welding efficiency, and ensure welding quality. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the U-rib plate unit.

[0020] Figure 2 This is a cross-sectional schematic diagram of a U-rib assembly of a U-rib plate element.

[0021] Figure 3 This is a schematic cross-sectional view of the sealing plate of the U-rib plate unit.

[0022] Figure 4 This is a schematic diagram of a sealing plate welding device for a U-rib plate unit according to an embodiment of this application, where the sealing plate is welded.

[0023] Figure 5 This is a schematic diagram of the overall structure of a sealing plate welding device according to an embodiment of this application.

[0024] Figure 6 This is a side view of a sealing plate welding device according to an embodiment of this application.

[0025] Figure 7 This is a front view schematic diagram of a sealing plate welding device according to an embodiment of this application. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0027] In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "lateral," "longitudinal," "top," "bottom," "inner," "outer," and "circumferential," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. The interpretation of such terms should be made from the perspective of someone skilled in the art.

[0028] In this invention, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," "link," and "fix" should be interpreted broadly from the perspective of someone skilled in the art. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0029] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0030] See Figure 1-2 The U-rib plate unit comprises a steel plate 1 and U-ribs 2. Each U-rib plate unit is welded together from several U-ribs and steel plates, forming a narrow, elongated cavity between the steel plate 1 and U-ribs 2. A longitudinal weld is formed at the junction of the steel plate and the U-ribs. In actual use as a bridge deck, steel plate 1 faces upwards, and U-ribs 2 face downwards. Steel plate 1 is structural steel with a thickness B ≥ 12 mm, a longitudinal length of up to 16 m, and a transverse width of up to 6 m.

[0031] Figure 2This is a cross-sectional schematic diagram of a U-rib assembly for a U-rib plate unit 100. The U-rib 2 is structural steel with a thickness b ≥ 6 mm, height H ≥ 250 mm, upper opening width Wa ≥ approximately 250 mm, and lower bottom width Wb ≥ 150 mm, formed by rolling or cold bending. It can be understood that the transverse direction in this application refers to the width of the steel plate of the U-rib plate unit (X direction in the figure), and the vertical direction refers to the direction perpendicular to the plane of the steel plate of the U-rib plate unit (Z direction in the figure). The longitudinal direction is the length direction of the U-rib, i.e., the direction in which the U-rib extends.

[0032] See Figure 3 This is a cross-sectional schematic diagram of the sealing plate of the U-rib unit. The outline of the sealing plate 3's cross-section matches the internal outline of the U-rib 2, and it is welded to the end of the U-rib 2, serving to seal, waterproof, and prevent rust. See also... Figure 4 This is a schematic diagram of the sealing plate welding device 101 of the U-rib plate unit of this application welding the sealing plate 3.

[0033] In one embodiment of this application, reference is made to Figure 5 The sealing plate welding device for the U-rib plate unit includes: a frame 1011, a moving mechanism 1021, and a welding mechanism 1031. The moving mechanism is connected to the frame, and the welding mechanism is connected to the moving mechanism. The moving mechanism is used to drive the welding mechanism to move; the welding mechanism is used to weld the U-rib sealing plate. It is understood that the frame 1011 is used to support the moving mechanism and the welding mechanism. For the specific structure of the frame, it can be a fixed beam structure, preferably including two longitudinally parallel fixed arms 1020 to ensure welding stability. The frame can also include two transversely arranged arms to form a frame structure, further enhancing fixation and stability.

[0034] In one embodiment, the moving mechanism includes a lateral moving mechanism and a vertical moving mechanism. The lateral moving mechanism includes a lateral guide rail 1022, and the vertical moving mechanism includes a vertical guide rail 1023, which is connected to the lateral guide rail. In one embodiment of this application, the vertical guide rail can move laterally along the lateral guide rail, and the welding mechanism can move vertically along the vertical guide rail. It is understood that the welding mechanism can be directly connected to the vertical moving mechanism, i.e., the vertical moving mechanism is located between the welding mechanism and the lateral moving mechanism; the welding mechanism can also be directly connected to the lateral moving mechanism, i.e., the lateral moving mechanism is located between the welding mechanism and the vertical moving mechanism. In one embodiment of this application, the welding mechanism is directly connected to the vertical moving mechanism, and the lateral moving mechanism is mounted on the frame, resulting in a reasonable structure, high space utilization, and greater structural stability. It is understood that in this application, the lateral direction refers to the width direction of the steel plate of the U-rib plate unit, and the vertical direction refers to the direction perpendicular to the plane of the steel plate of the U-rib plate unit.

[0035] In one embodiment, the moving mechanism further includes a longitudinal moving mechanism 1024, which drives the welding mechanism to move longitudinally, with the longitudinal direction being the length direction of the U-rib of the U-rib plate unit. In one embodiment, the longitudinal moving mechanism includes a longitudinal moving frame 1012, which is connected to the frame, and a transverse guide rail of the transverse moving mechanism is disposed on the longitudinal moving frame. In one embodiment, the longitudinal moving mechanism further includes rollers 1025 and a longitudinal fixing structure 1013. The longitudinal moving mechanism 1024 can roll on the frame via the rollers, and the longitudinal moving mechanism 1024 is detachably connected to the frame via the longitudinal fixing structure. The longitudinal fixing structure can be in the form of snap-fit, bolt connection, etc. In one embodiment, the longitudinal fixing structure 1013 is a snap-fit ​​structure, with a bayonet on the frame 1011 and a buckle on the longitudinal moving frame 1012. When the longitudinal moving mechanism 1024 moves to the desired position, the buckle locks in the bayonet, completing the longitudinal fixing. Specifically, the bayonet is disposed on the fixed arm, and the rollers can move on the fixed arm. Four rollers can be provided, with two rollers corresponding to each fixed arm. The longitudinal moving frame has a crossbeam 1026 spanning two fixed arms, with a transverse guide rail mounted on the crossbeam. In this embodiment, a detachable longitudinal fixing structure 1013 is provided, facilitating the disassembly and installation of the welding mechanism and the moving mechanism from the frame, which is simple and effective. The use of rollers avoids disassembly difficulties caused by the excessive weight of the sealing plate welding device. The rollers can roll directly, and after the longitudinal fixing structure 1013 is unlocked, the welding structure and the moving mechanism can roll directly on the frame, making disassembly convenient. Furthermore, the welding structure and the moving mechanism can roll directly off the frame (the vertical moving mechanism can be adjusted to above ground level as needed to prevent collisions with the ground) and move on the ground, facilitating handling. In one embodiment, the vertical guide rail of the vertical moving mechanism is height-adjustable. During disassembly and handling, its maximum adjustable height is above the ground. During welding, after the longitudinal fixing structure is locked, its height is lowered to a suitable level, making full use of space.

[0036] In one embodiment, the welding mechanism includes a welding torch positioning mechanism, which includes a rotating shaft 1014 for engaging with the inner contour of the U-rib where the sealing plate to be welded is located. The welding torch positioning mechanism also includes a rotary drive mechanism connected to a vertical movement mechanism, which drives the rotating shaft to rotate. Specifically, the rotary drive mechanism includes a rotary drive motor 1017, a first gear 1015, and a second gear 1016. The rotary drive mechanism is connected to a vertical guide rail 1023 via a rotary drive bracket 1018 and a guide rail connecting plate 1019. The rotary drive motor 1017, the first gear 1015, and the second gear 1016 are mounted on the rotary drive bracket 1018. The first gear 1015 is connected to the output shaft of the rotary drive motor 1017, the second gear 1016 meshes with the first gear 1015, and the rotating shaft 1014 is connected to the second gear 1016. The welding torch is fixed on the rotating shaft 1014 (not shown in the figure). By setting a rotatable welding torch positioning mechanism, the torch can be rotated and positioned while welding the sealing plate, reducing friction, ensuring accurate positioning, and smooth operation.

[0037] In one embodiment, the sealing plate welding device further includes a U-rib plate unit positioning structure, which comprises a U-rib positioning structure, a steel plate vertical positioning structure, and a steel plate longitudinal positioning structure. The U-rib positioning structure is used to define the position of the sealing plate welding device and the U-rib where the sealing plate to be welded is located; the steel plate vertical positioning structure is used to define the vertical position of the sealing plate welding device and the steel plate of the U-rib plate unit; and the steel plate longitudinal positioning structure is used to define the longitudinal position of the sealing plate welding device and the steel plate of the U-rib plate unit.

[0038] Specifically, in one embodiment, the U-rib positioning structure includes at least one side plate 1042, which is connected to the fixed arm of the frame. The side plate has the same inclination angle as the outer surface of the U-rib and is used to fit against the outer surface of the U-rib. By directly fitting the side plate against the outer surface of the U-rib, quick positioning and disassembly are possible, adapting to various positions of the U-rib and improving equipment utilization efficiency. The steel plate vertical positioning structure includes a steel plate vertical contact surface 1044, which is used to fit against the upper surface of the steel plate; preferably, the steel plate vertical contact surface is the lower edge of the fixed arm of the frame. The steel plate longitudinal positioning structure includes a steel plate longitudinal contact surface 1045, which is used to abut against the end face of the steel plate (see reference). Figure 6 Preferably, the longitudinal bonding surface of the steel plate is located below the frame.

[0039] In one embodiment, the sealing plate welding device includes a fixing mechanism connected to the frame for fixing the sealing plate welding device to the U-rib plate unit. The fixing structure includes a clamping plate 1051 with threaded holes 1052. In use, the vertical contact surface 1044 of the steel plate is in contact with the upper side of the steel plate, and screws pass through the threaded holes and abut against the lower side of the steel plate. In one embodiment, the longitudinal contact surface 1045 of the steel plate is disposed on one side of a longitudinal contact plate 1046, and the clamping plate 1051 is connected to the fixing arm 1020 via the longitudinal contact plate 1046. The fixing structure also includes a fixing plate 1043, the shape of which can be the same as the side plate 1042. The fixing plate 1043 has multiple threaded holes 1044. The fixing plate 1043 and the side plate 1042 are arranged opposite each other, with the distance between the side plate 1042 and the fixing plate 1043 greater than the width of the outer contour of the U-rib. In use, the side plate 1042 is fitted against the outer surface of one side of the U-rib, and screws are passed through the threaded holes of the fixing plate to press against the outer surface of the other side of the U-rib (see reference). Figure 7 ).

[0040] In this embodiment, the vertical contact surface 1044 of the steel plate is the lower edge of one end of the fixed arm. The vertical positioning structure of the steel plate is essentially one end of the fixed arm. This method is simple, stable, and convenient for positioning. Of course, other more complex methods can also be used. Furthermore, the longitudinal contact surface of the steel plate is located below the frame. The fixing structure includes a clamping plate with threaded holes. In use, the longitudinal contact surface of the steel plate abuts against the end face of the steel plate, with the vertical contact surface of the steel plate contacting the upper side of the steel plate, and the screw passing through the threaded holes abutting against the lower side of the steel plate. This method results in a simple and stable overall structure, and convenient positioning and fixing of the steel plate.

[0041] In the embodiments of this application, the fixing mechanisms are all purely mechanical connection structures, which are simple, stable, and easy to fix. Of course, other more complex methods can also be used, such as electric control structures or hydraulic structures, but these are more expensive, more complex, have a higher failure rate, and are not convenient for disassembly and transportation.

[0042] This application adopts a purely mechanical structure, makes reasonable use of space, and forms a detachable integral structure through a clever U-rib plate unit positioning structure, fixing mechanism and moving mechanism. The structure is simple, low cost and easy to assemble and disassemble.

[0043] One embodiment of this application also provides a sealing plate welding system for a U-rib plate unit. The sealing plate welding system includes a sealing plate welding device and a moving platform (not shown). The sealing plate welding device is connected to the moving platform, which includes a horizontal moving mechanism and a lifting mechanism for moving the sealing plate welding device to the sealing plate to be welded. It is understood that the sealing plate welding device can be any of the sealing plate welding devices or combinations thereof described in the above embodiments. The single sealing plate welding device of this application is lightweight and convenient for mobile construction.

[0044] In one embodiment, the mobile platform is a forklift. The forklift and the sealing plate welding device can be separate and independent devices. A socket is provided at one end of the sealing plate welding device, and the forklift has a connecting arm. The connecting arm is inserted into the socket to transport, move, and secure the sealing plate welding device. The forklift and the sealing plate welding device can also be designed with other detachable connection methods, such as bolted connections or snap-fit ​​connections. In one embodiment, the forklift is an existing forklift or a custom-designed forklift. Utilizing an existing forklift allows for efficient use of existing products, enabling the movement of the sealing plate welding device in the factory, and can well adapt to the stacking of multiple U-rib plate units, lifting the sealing plate welding device to the height of the U-rib plate unit to be welded for welding.

[0045] In one embodiment of this application, multiple sealing plate welding devices can be used in parallel according to construction requirements, improving worker efficiency. Furthermore, the welding torch head adopts an open chuck, allowing for quick replacement of different welding torches to suit various sealing plate welding needs. In one embodiment, the sealing plate welding system also includes an LCD screen for real-time display of the welding status and convenient parameter adjustment. During welding, different welding voltages, currents, and speeds can be set for different welding sections to ensure optimal welding results.

[0046] One embodiment of this application also provides a sealing plate welding method for a U-rib plate unit, the sealing plate welding method including welding using the sealing plate welding device as described in any of the above embodiments or welding using the sealing plate welding system as described above.

[0047] In one embodiment of this application, the sealing plate welding method includes:

[0048] Using a forklift, the sealing plate welding device is moved to the U-rib. The longitudinal bonding surface 1045 of the steel plate on one side of the longitudinal bonding plate 1046 abuts against one end of the steel plate. The vertical bonding surface 1044 of the steel plate is bonded to the upper side of the steel plate. The side plate 1042 is bonded to the outer side of one side of the U-rib. The screw is passed through the fixing plate threaded hole 1044 of the fixing plate 1043 and pressed against the outer side of the other side of the U-rib. The screw is passed through the clamping plate threaded hole 1052 of the clamping plate 1051 and abuts against the lower side of the steel plate.

[0049] Adjust the position of the welding mechanism and the welding torch, align the torch tip with the welding origin, and begin contour welding from the origin along the outline of the sealing plate.

[0050] Specifically, the origin of the coordinate system is set at the intersection of U-rib 2 and one side of steel plate 1, and the program controls the welding torch head to move to the origin of the coordinate system. The contour welding method is as follows: In the positioning coordinate system, key parameters are set according to the shape of U-rib, the rotating shaft 1014 moves along the inner contour of U-rib 2, and the welding torch is fixed on the rotating shaft 1014 (not shown in the figure), thereby completing the contour welding.

[0051] The contouring motion of this application is programmable and operates in three directions via horizontal and vertical guide rails and a rotary motor, making it suitable for welding U-rib end plates of various specifications. Using the U-rib plate unit welding method of this application, workers can operate multiple end plate welding devices simultaneously, which is convenient, efficient, and produces high-quality welds.

[0052] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A sealing plate welding device for a U-rib plate unit, characterized in that, The sealing plate welding device for the U-rib plate unit includes: a frame, a moving mechanism, and a welding mechanism; the moving mechanism is connected to the frame, and the welding mechanism is connected to the moving mechanism; the moving mechanism is used to drive the welding mechanism to move; the welding mechanism is used to weld the sealing plate of the U-rib plate unit. The sealing plate welding device further includes a U-rib plate unit positioning structure, which includes a U-rib positioning structure, a steel plate vertical positioning structure, and a steel plate longitudinal positioning structure. The U-rib positioning structure is used to define the position of the sealing plate welding device and the U-rib where the sealing plate to be welded is located. The steel plate vertical positioning structure is used to define the vertical position of the sealing plate welding device and the steel plate of the U-rib plate unit. The steel plate longitudinal positioning structure is used to define the longitudinal position of the sealing plate welding device and the steel plate of the U-rib plate unit. The frame includes two fixed arms, and the U-rib positioning structure includes at least one side plate. The side plate is connected to the fixed arm of the frame, and the side plate has the same inclination angle as the outer side of the U-rib for fitting against the outer side of the U-rib. The sealing plate welding device includes a fixing mechanism, which includes a fixing plate. The fixing plate is disposed opposite to the side plate, and the distance between the side plate and the fixing plate is greater than the width of the outer contour of the U-rib.

2. The sealing plate welding device according to claim 1, characterized in that, The moving mechanism includes a lateral moving mechanism and a vertical moving mechanism. The lateral moving mechanism includes a lateral guide rail, and the vertical moving mechanism includes a vertical guide rail. The vertical guide rail is connected to the lateral guide rail, and the vertical guide rail can move laterally along the lateral guide rail. The welding mechanism can move vertically along the vertical guide rail.

3. The sealing plate welding device according to claim 2, characterized in that, The moving mechanism further includes a longitudinal moving mechanism, which can drive the welding mechanism to move longitudinally, where the longitudinal direction is the length direction of the U-rib of the U-rib plate unit.

4. The sealing plate welding device according to claim 3, characterized in that, The longitudinal moving mechanism includes a longitudinal moving frame connected to the frame, and the transverse moving mechanism has a transverse guide rail disposed on the longitudinal moving frame.

5. The sealing plate welding device according to claim 1, characterized in that, The welding mechanism includes a welding torch positioning mechanism, which includes a rotating shaft for fitting against the inner contour of the U-rib where the sealing plate to be welded is located.

6. The sealing plate welding device according to claim 5, characterized in that, The welding torch positioning mechanism further includes a rotary drive mechanism, which is connected to the moving mechanism and is used to drive the rotating shaft to rotate.

7. The sealing plate welding device according to claim 1, characterized in that, The vertical positioning structure of the steel plate includes a vertical contact surface of the steel plate, which is the lower edge of the fixed arm of the frame.

8. The sealing plate welding device according to claim 1, characterized in that, The longitudinal positioning structure of the steel plate includes a longitudinal bonding surface of the steel plate, which is located below the frame.

9. The sealing plate welding device according to claim 7, characterized in that, The fixing mechanism is connected to the frame and is used to fix the sealing plate welding device to the U-rib plate unit.

10. The sealing plate welding device according to claim 9, characterized in that, The fixing mechanism includes a clamping plate, which is arranged opposite to the vertical contact surface of the steel plate. The clamping plate has a threaded hole, through which a screw passes and abuts against the steel plate.

11. The sealing plate welding device according to claim 1, characterized in that, The fixing plate has a fixing plate threaded hole, and the screw passes through the fixing plate threaded hole and abuts against the outer side of the U-rib.

12. A sealing plate welding system for a U-rib plate unit, characterized in that: The sealing plate welding system includes a sealing plate welding device as described in any one of claims 1-11, and the sealing plate welding system further includes a moving platform. The sealing plate welding device is connected to the moving platform, and the moving platform includes a horizontal moving mechanism and a lifting mechanism for moving the sealing plate welding device to the sealing plate to be welded.

13. The sealing plate welding system according to claim 12, characterized in that, The mobile platform is a forklift device.

14. A sealing plate welding method for a U-rib plate unit, characterized in that: The sealing plate welding method includes welding using the sealing plate welding apparatus as described in any one of claims 1-11 or welding using the sealing plate welding system as described in any one of claims 12-13.

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