Galvanized plate multi-dimensional precise welding device and welding method

Abstract

The invention discloses a galvanized sheet multi-dimensional precise welding device and method, and relates to the technical field of galvanized sheet welding. The multi-dimensional precise welding device for the galvanized sheet comprises a welding robot; the rotating platform is used for bearing a galvanized sheet workpiece to be welded and can actively rotate; the positioning plates are arranged above the rotating platform, the positioning plates are evenly arranged in the circumferential direction of the rotating platform, the positioning plates are divided into an inner ring group and an outer ring group, and the two groups of positioning plates can move face to face or back to back in the radial direction so as to carry out space alignment and clamping on the multiple galvanized plates, so that the galvanized plates are assembled into a prefabricated box body structure. The inner positioning plate and the outer positioning plate are arranged to conduct bidirectional synchronous clamping on the side edge of the galvanized plate, accurate control over the perpendicularity and the splicing gap of a workpiece is achieved, high-precision centering assembly of a box body structure is ensured, the overall rigidity in the welding process is remarkably improved, and thermal deformation and position deviation are effectively restrained.

Description

Technical Field

[0001] This invention relates to the field of welding technology for galvanized steel sheets, specifically to a multi-dimensional precision welding device and welding method for galvanized steel sheets. Background Technology

[0002] Galvanized steel sheet, with its zinc-coated surface, is widely used in fields with stringent requirements for sealing and strength, such as building structures, appliance liners, and automotive chassis components, due to its excellent corrosion resistance and good formability. When constructing high-precision, high-sealing enclosed load-bearing components (such as refrigerator liners, automotive chassis components, or industrial ventilation ducts), multiple galvanized sheets are often assembled into a rectangular box structure using precision welding processes.

[0003] However, the following problems still exist in the process of assembling and welding multiple galvanized sheets into the required rectangular box structure: Before welding, galvanized sheets are usually fixed by spot welding. However, spot welding can easily damage the integrity of the galvanized layer surface, causing contamination of the welding interface and affecting the density of the weld. At the same time, the number of spot welds is limited, the pre-fixing force is weak and unevenly distributed, and it cannot effectively resist the thermal stress during the welding process. This can cause the sheet to slip slightly or misalign at high temperatures, resulting in poor weld formation. In addition, after completing the single-sided welding, the workpiece needs to be manually flipped to perform multi-sided welding. This is not only cumbersome and inefficient, but also has poor repeatability and positioning accuracy, resulting in large deviations in the position of the welds on each side and discontinuous joints, which seriously affects the consistency of product dimensions and structural reliability.

[0004] During the welding process, if the forces on both sides of the weld of the galvanized sheet are asymmetrical or the support is insufficient, it is very easy to cause dynamic deformation and local displacement of the sheet. This uneven stress state causes the weld gap to change continuously during the welding process, the molten pool to be unstable, resulting in defects such as discontinuous weld formation and undercut. At the same time, the weld is not tightly fitted, which can easily lead to problems such as poor fusion and incomplete penetration, weakening the connection strength and structural integrity. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a multi-dimensional precision welding device and method for galvanized steel sheets, solving the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a multi-dimensional precision welding device for galvanized steel sheets, comprising: a welding robot; a rotating platform, the rotating platform being used to support the galvanized steel sheet workpiece to be welded and capable of active rotation; positioning plates, the positioning plates being disposed above the rotating platform and having multiple sets evenly arranged along the circumference of the rotating platform, the positioning plates being divided into an inner ring group and an outer ring group, the two sets of positioning plates being able to move radially towards or away from each other to spatially align and clamp multiple galvanized steel sheets, assembling them into a prefabricated box structure; and a weld pre-pressing mechanism, the weld pre-pressing mechanism being circumferentially distributed outside the positioning plates, including extrusion heads evenly distributed along the joint path, the extrusion heads being able to apply point-contact local pressure to the joint area of ​​adjacent plates before welding begins, achieving local stable clamping of the weld area.

[0007] Furthermore, the extrusion head is a cylindrical extrusion table with its axis perpendicular to the weld extension direction. It is used to apply local pressure to both sides of the weld. In the two sets of cylindrical extrusion tables set on opposite sides of the weld, each side away from the weld is provided with an inclined surface. The two inclined surfaces are arranged opposite each other and form a sliding fit pair.

[0008] Furthermore, a limiting slot is provided on the inclined surface of the cylindrical extrusion table in the outer ring group, and a guide bracket is provided at the end of the welding gun of the welding robot, with the guide bracket slidingly engaging with the limiting slot.

[0009] Furthermore, the extrusion head consists of two extrusion plates that are hinged together, with the hinge axis of the two extrusion plates perpendicular to the surface of the corresponding galvanized sheet. The two sets of extrusion plates arranged on opposite sides of the weld are staggered vertically.

[0010] Furthermore, a sliding column is fixedly connected to the side of the extrusion head away from the weld. All sliding columns slide together on the same fixed bracket. A pushing column is slidably installed on the fixed bracket. A top rod is installed at the end of the pushing column facing the extrusion head. The top rod is used to abut against the end of the corresponding sliding column. A support spring is provided between the sliding column and the fixed bracket in the section through which it passes.

[0011] Furthermore, each of the push columns corresponding to the vertically placed galvanized sheet is hinged with a connecting rod in the middle, and multiple connecting rods located on the outside of the positioning plate on the same side are hinged together on the same push frame; the positioning plate is hinged to the rotating platform, on which a guide groove plate is installed, and an elastic telescopic rod is installed on the push frame, the movable end of the elastic telescopic rod is hinged to the guide groove plate and slides along its groove length direction.

[0012] Furthermore, control rods are hinged to the opposite sides of the two sets of push frames, and the other ends of the two control rods extend inclinedly towards the center and are hinged together at the upper end of the same cross. The two control rods are arranged in an inverted V-shape symmetrically. A radially extending movable through slot is provided on the rotating platform to avoid the movement of the control rods. The lower end of the cross is fixedly connected to the telescopic rod of the cylinder.

[0013] Furthermore, each of the push columns, corresponding to the uppermost galvanized plate and located on the same horizontal plane, has a side rod hinged to its side near the central axis. The other end of each side rod is hinged to the same movable frame via a torsion spring rod. A push rod is installed at the lower end of the lower movable frame, extending downwards and sliding through the rotating platform before being fixedly connected to the cross. A rotating shaft is fixedly connected to the upper end of the upper movable frame, and the rotating shaft is rotatably installed at the lower end of the horizontal section of the inverted U-shaped frame. A slider is hinged to the lower end of the vertical section of the inverted U-shaped frame, and the slider is slidably disposed on the upper end of the fixed ring. An inclined plate is hinged to the inner side of the fixed ring, with the middle of the inclined plate hinged to the lower end of the rotating platform, and the other end of the inclined plate hinged to the cross.

[0014] Furthermore, Z-shaped brackets are installed at the four corners of the upper movable frame. The lower horizontal section of the Z-shaped bracket has an installation groove. A connecting block is slidably connected in the installation groove. A triangular pressure block is fixedly connected to the lower end of the connecting block. A telescopic spring is provided between the connecting block and the groove wall of the installation groove. A stop bar for abutting the triangular pressure block is installed on the corresponding fixed bracket.

[0015] This invention also provides a method for multi-dimensional precision welding of galvanized steel sheets, applicable to multi-dimensional precision welding devices for galvanized steel sheets, comprising the following steps: Step 1: Place the four vertical galvanized sheets to be welded on the top of the rotating platform, positioning them between the inner and outer ring positioning plates respectively. Step 2: Control the inner and outer positioning plates to swing synchronously in opposite directions, clamping the inner and outer edges of the vertically placed galvanized sheet to achieve dual positioning of its verticality and circumferential position. During the positioning process, place the fifth galvanized sheet between the upper ends of the four vertical plates to form a closed prefabricated box structure. Step 3: The weld pre-pressing mechanism moves synchronously with the positioning plate, causing the extrusion heads at each weld position to move synchronously, applying local pressure to the weld area of ​​the galvanized sheet to form a stable pre-pressing state; Step 4: Control the welding robot to move along the weld path and perform continuous and uniform welding on the pre-pressed weld. After completing the welding of the vertical weld on one side and the horizontal weld at the top, drive the rotating platform to rotate 90 degrees and move the prefabricated box workpiece into the next welding station. Repeat the welding until all welds are completed.

[0016] The present invention has the following beneficial effects: (1) The multi-dimensional precision welding device for galvanized sheet uses two sets of inner and outer positioning plates to clamp the sides of the galvanized sheet in both directions. This not only achieves precise control of the workpiece verticality and splicing gap, ensuring high-precision centering and assembly of the box structure, but also significantly improves the overall rigidity during the welding process, effectively suppressing thermal deformation and positional deviation. This structure integrates positioning, centering and assembly, eliminating the need for pre-spot welding, thus avoiding stress concentration, base material damage and weld defects. It simplifies the process flow, improves work efficiency, and ensures uniform fit of the main weld at the beginning, providing a stable and reliable process foundation for automated continuous welding, and significantly improving the consistency of welding quality and the dimensional accuracy of the product.

[0017] (2) The multi-dimensional precision welding device for galvanized sheet, by setting a weld pre-pressing mechanism, applies local pressure to the corner or butt weld area of ​​adjacent galvanized sheets by the extrusion head in a point-contact manner before welding begins, effectively eliminating assembly gaps and ensuring that the weld area is in a tight fit and stable butt joint state. While ensuring the clamping strength of key connection parts, it avoids the overall deformation of thin sheet or scratches on the galvanized layer caused by large-area pressing, significantly improving surface quality and structural integrity. More importantly, the local pressure effectively suppresses defects such as misalignment and warping caused by stress concentration and uneven expansion during the welding heat input process, enhancing the uniformity of weld formation and joint strength.

[0018] (3) The multi-dimensional precision welding device for galvanized sheet achieves automatic clamping and multi-dimensional stable fixation of galvanized sheet workpieces through the coordinated cooperation of positioning plate and weld pre-pressing mechanism, effectively ensuring the rigidity and positioning accuracy of workpieces during welding. After completing the welding of one side of the weld, the rotating platform automatically drives the workpiece to rotate precisely to the next station, realizing seamless connection of multi-sided continuous welding. It gets rid of the traditional manual workpiece flipping operation method, which not only significantly improves production efficiency and process continuity, but also avoids the positioning deviation and clamping inconsistency caused by human operation, ensuring that the welds on each side are uniformly formed under the same process conditions.

[0019] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0020] Figure 1 This is an overall diagram of the present invention; Figure 2 This is a schematic diagram of the rotating platform and rotating gear in this invention; Figure 3 This is a partial bottom view of the worktable and rotating platform in this invention. Figure 4 This is a schematic diagram of the positioning plate in this invention; Figure 5This is a schematic diagram of the connecting rod, the push frame, and the control rod in this invention; Figure 6 This is a partial cross-sectional view of the rotating platform in this invention; Figure 7 This is a schematic diagram of the positioning plate located in the inner ring group in this invention; Figure 8 This is a partial cross-sectional view of the movable frame and Z-shaped support in this invention; Figure 9 This is a schematic diagram of the structure of the movable frame, side rod, and fixed support in this invention; Figure 10 This is a schematic diagram of the weld preloading mechanism in Embodiment 1 of the present invention; Figure 11 This is a schematic diagram of the limiting slot and guide bracket in Embodiment 1 of the present invention; Figure 12 This is a schematic diagram of the weld preloading mechanism in Embodiment 2 of the present invention; Figure 13 This is a schematic diagram of the extrusion plate and the fixing plate in Embodiment 2 of the present invention.

[0021] In the diagram, 1. Rotary platform; 11. External gear ring; 12. Rotating gear; 13. Drive motor; 2. Welding robot; 21. Guide bracket; 3. Worktable; 31. Positioning plate; 32. Weld pre-compression mechanism; 321. Cylindrical extrusion table; 322. Sliding column; 323. Fixed bracket; 324. Push column; 325. Top rod; 326. Support spring; 327. Support plate; 328. Guide column; 329. Connecting rod; 330. Push frame; 331. 332. Elastic telescopic rod; 333. Control rod; 334. Cross; 335. Cylinder; 336. Side rod; 337. Moving frame; 338. Push rod; 339. Base plate; 340. Rotating shaft; 341. Inverted U-shaped frame; 342. Fixing ring; 343. Inclined plate; 344. Z-shaped bracket; 345. Connecting block; 346. Triangular pressure block; 347. Telescopic spring; 348. Limiting slot; 349. Extrusion plate; 350. Fixing plate; 36. Support rod. Detailed Implementation

[0022] 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] In the description of this invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0024] The following reference Figure 1 - Figure 13 This invention describes a multi-dimensional precision welding device and welding method for galvanized steel sheets provided in an embodiment of the present invention.

[0025] On the one hand, the present invention provides a multi-dimensional precision welding device for galvanized sheets.

[0026] Example 1, please refer to this example. Figure 1 - Figure 11 .

[0027] Please refer to Figure 1 This multi-dimensional precision welding device for galvanized steel sheets includes a rotating platform 1 and a welding robot 2. The rotating platform 1 is rotatably mounted on a workbench 3 to support box-shaped workpieces assembled from multiple galvanized steel sheets and can actively rotate around a vertical axis. The welding robot 2 is located on one side of the rotating platform 1, with its welding torch aligned with the part of the workpiece to be welded. It can automatically complete continuous and uniform welding of the weld seam. After welding one side, the rotating platform 1 drives the workpiece to rotate precisely at a certain angle (such as 90°) to move the next side to be welded into the working range of the welding robot 2, realizing automatic switching of the workpiece between different welding stations. The entire process does not require manual intervention to flip the workpiece, which not only avoids positioning errors caused by manual operation, but also significantly improves welding efficiency and process continuity.

[0028] Please refer to Figure 1 and Figure 2 To achieve the rotation of the rotating platform 1, an external gear ring 11 is fixedly fitted on the outside of the rotating platform 1. A rotating gear 12, which is rotatably mounted on the upper end of the worktable 3, meshes with the outer side of the external gear ring 11. The lower end of the rotating gear 12 is connected to the output shaft of the drive motor 13. The drive motor 13 is mounted on the lower end of the worktable 3. When working, the drive motor 13 starts, and the power is transmitted to the rotating gear 12 through the output shaft, causing it to rotate. The rotating gear 12 meshes with the external gear ring 11, transmitting the power to the external gear ring 11, thereby driving the rotating platform 1 to rotate smoothly around its central axis. Preferably, it rotates 90° each time, so that the adjacent sides of the workpiece are aligned with the working position of the welding robot 2 in sequence, realizing the continuous welding of the four-sided box structure.

[0029] Please refer to Figure 2 and Figure 4To improve the positioning stability of galvanized sheets on the rotating platform 1 and to enable their automatic assembly into a prefabricated box structure, multiple sets of positioning plates 31 are hinged to the upper end of the rotating platform 1, which are evenly distributed in the circumference. The positioning plates 31 are divided into an inner ring group and an outer ring group, located on the inner and outer sides of the galvanized sheets, respectively. The two sets of positioning plates 31 can move radially towards each other or away from each other along the rotating platform 1. When the workpiece is placed in place, the inner and outer positioning plates 31 clamp together in the middle at the same time, centering and stabilizing the sides of the four vertical galvanized sheets, ensuring that their verticality and splicing gap meet the welding requirements. This not only effectively prevents the workpiece from shifting or deforming during the welding process, but also completes the precise assembly of the box while clamping.

[0030] Please refer to Figure 2 To ensure the stability and quality of the weld joints between galvanized sheets, a circumferentially distributed weld pre-pressing mechanism 32 is provided on the outside of the positioning plate 31. The weld pre-pressing mechanism 32 includes extrusion heads evenly distributed along the joint path. Before welding begins, the extrusion heads are activated to apply local pressure to the corner or butt weld areas of adjacent galvanized sheets in a point-contact manner. This point-contact pre-pressing can effectively eliminate assembly gaps, prevent misalignment or warping caused by thermal deformation during welding, and avoid deformation or damage to the galvanized layer caused by large-area pressing.

[0031] For details, please refer to Figure 5 and Figure 10 The extrusion head is a cylindrical extrusion table 321. The axis of the cylindrical extrusion table 321 is perpendicular to the extension direction of the weld. It is used to apply local pressure to both sides of the weld. Before welding, the cylindrical extrusion tables 321 on both sides move synchronously towards the center of the weld to apply local pressure to the joint area of ​​the galvanized sheet by opposing point contact. This effectively tightens the weld and eliminates gaps, while avoiding deformation of the sheet due to large-area contact. An inclined surface is provided on the outer circumference of the cylindrical extrusion table 321 on the side away from the weld. When the two extrusion tables move towards each other, the two inclined surfaces approach each other and form a sliding fit pair. During the pressure application, a component force is generated along the inclined surface, which causes the two cylindrical extrusion tables 321 to automatically fine-tune the centering after contacting the workpiece, compensate for assembly deviations, and ensure uniform pressure transmission.

[0032] Please refer to Figure 10To ensure that the extrusion heads located on both sides of the weld can press the weld in opposite directions and stably clamp the weld, a sliding column 322 is fixedly connected to the side of the extrusion head away from the weld. All sliding columns 322 are slidably mounted on the same fixed bracket 323. A pushing column 324 is slidably installed on the fixed bracket 323. A push rod 325 is installed at the end of the pushing column 324 facing the extrusion head. The push rod 325 is used to abut against the end of the corresponding sliding column 322. A support spring 326 is provided between the section of the sliding column 322 that passes through the fixed bracket 323 and the fixed bracket 323. Under the elastic force of the support spring 326, the sliding column 322 drives the extrusion head to maintain a pre-tightening tendency towards the weld, so that the extrusion head is initially in a position close to the workpiece.

[0033] During operation, the push column 324 moves synchronously with the fixed bracket 323, and pushes the sliding column 322 through the top rod 325, causing the two extrusion heads on both sides to move closer to each other and press the two sides of the weld respectively. When the fixed bracket 323 moves to its position, it stops, and the push column 324 continues to move forward. At this time, the top rod 325 further pushes the sliding column 322, compressing the support spring 326, so that the extrusion head can elastically give way while continuously applying stable pressure.

[0034] Please refer to Figure 5 To ensure reliable positioning of the fixed bracket 323 after it moves into place and to achieve step-by-step movement between the extrusion head and the push column 324, support plates 327 are installed on both sides of the positioning plate 31. The lower end of the fixed bracket 323 slides with the support plate 327 to achieve horizontal guidance and support. At the same time, a vertically arranged guide column 328 is also provided on the positioning plate 31. The upper fixed bracket 323 and the guide column 328 form an upper and lower sliding pair. When the fixed bracket 323 moves along the support plate 327 and the guide column 328 to the end of its stroke, it reaches the preset safe position. At this time, the fixed bracket 323 is limited and remains stationary. This position ensures that the extrusion head is close to the weld but not fully pressurized, leaving space for subsequent elastic clamping. After that, the push column 324 can continue to slide independently in the fixed bracket 323. The push rod 325 pushes the sliding column 322 to compress the support spring 326, allowing the extrusion head to advance further and complete the flexible clamping of the weld.

[0035] Please refer to Figure 4 - Figure 7 To achieve synchronous opposite swinging of the inner and outer positioning plates 31, a connecting rod 329 is hinged to the middle of each push column 324 corresponding to the vertically placed galvanized plate. Multiple connecting rods 329 located on the outer side of the positioning plate 31 on the same side are hinged to the same push frame 330. A guide groove plate is installed on the positioning plate 31, and an elastic telescopic rod 331 is installed on the push frame 330. The movable end of the elastic telescopic rod 331 is hinged to the guide groove plate and slides along its groove length.

[0036] During operation, the pusher 330 moves towards the galvanized sheet. Through the cooperation of the elastic telescopic rod 331 and the guide groove plate, it pushes the positioning plate 31 to rotate around its hinge point, so that the inner and outer positioning plates 31 simultaneously clamp the side of the galvanized sheet, achieving rapid centering and stable clamping. During this process, the weld pre-pressing mechanism 32 swings synchronously with the positioning plate 31, gradually approaching the weld area. When the positioning plate 31 rotates to vertical and completes the alignment, the pusher 330 continues to move forward. At this time, the elastic telescopic rod 331 is compressed and retracted under continuous thrust, storing elastic potential energy, thus allowing the pusher 330 to continue driving the connecting rod 329 to move without jamming. The connecting rod 329 then drives the push column 324 and the fixed bracket 323 connected to it to continue moving forward until the preset pressurization position is reached.

[0037] Please refer to Figure 3 - Figure 7 To achieve synchronous driving of the inner and outer sets of push frames 330, control rods 332 are hinged to the opposite sides of the two sets of push frames 330. The other ends of the two control rods 332 extend towards the center and are hinged together to the upper end of the same cross 333. The two control rods 332 are arranged in an inverted V-shape symmetrically. A radially extending movable through slot is provided on the rotating platform 1 to avoid the movement of the control rods 332. The lower end of the cross 333 is fixedly connected to the telescopic rod of the cylinder 334. The cylinder 334 is installed at the lower end of the rotating platform 1 through a mounting bracket.

[0038] During operation, cylinder 334 is activated, pushing cross 333 to move vertically upward. Since the two ends of control lever 332 are hinged to push frame 330 and cross 333 respectively, when cross 333 rises, the two control levers 332 move upward synchronously under the linkage, and their roots rotate outward, and the inverted V-shaped angle gradually increases, thereby pushing the push frame 330 on the inner and outer sides to move radially towards each other, ensuring that the positioning plates 31 on both sides apply force evenly and move in a coordinated manner.

[0039] Please refer to Figure 7 - Figure 9 To achieve synchronous support for the uppermost galvanized sheet and pre-press clamping at the joint with the side plate, each push column 324, which is located on the same horizontal plane as the uppermost galvanized sheet, has a side rod 335 hinged on one side near the central axis. The other end of each side rod 335 is hinged to the same moving frame 336 through a torsion spring rod. A push rod 337 is installed at the lower end of the moving frame 336. The push rod 337 extends downward and is fixedly connected to the cross 333 after sliding through the rotating platform 1.

[0040] During operation, cylinder 334 drives the cross 333 to move upward, causing push rod 337 and moving frame 336 to rise synchronously. Moving frame 336, through side rods 335, pushes corresponding push columns 324 towards the center, thereby driving the top surface weld pre-pressing mechanism 32 to press synchronously against the inner wall of the top plate, achieving support for the top plate and clamping the weld between it and the side plates. Side rods 335 and moving frame 336 are connected by torsion springs, ensuring that side rods 335 are always subjected to circumferential pre-tension during the upward movement, maintaining... Maintaining a stable upward posture, the torsion spring has sufficient elasticity to effectively support the weight of the side rod 335, push column 324, and fixed bracket 323 connected to it during the upward movement of the moving frame 336, preventing motion lag or posture instability caused by the sag of the components due to gravity. At the same time, a base plate 338 is provided on the fixed bracket 323, which slides with the moving frame 336. The base plate 338 provides horizontal support for the fixed bracket 323, so that it maintains a stable posture during movement and does not tilt or deflect.

[0041] Please refer to Figure 1 , Figure 2 and Figure 8 To achieve synchronous pressing of the uppermost galvanized plate and pre-press support of the joint area with the side plate, a rotating shaft 339 is fixedly connected to the upper end of the upper movable frame 336. The rotating shaft 339 is rotatably installed at the lower end of the horizontal section of the inverted U-shaped frame 340. Thus, when the rotating platform 1 drives the workpiece and the movable frame 336 to rotate, the rotating shaft 339 can rotate freely relative to the inverted U-shaped frame 340, so that the upper weld pre-pressing mechanism 32 rotates synchronously with the workpiece, ensuring that the welding robot 2 is not obstructed when welding at each station.

[0042] Please refer to Figure 1 - Figure 3 The vertical section of the inverted U-shaped frame 340 is slidably connected to the worktable 3. A slider is hinged to the lower end of the vertical section of the inverted U-shaped frame 340. The slider is slidably mounted on the upper end of the fixed ring 341, and the sliding trajectory extends circumferentially along the fixed ring 341. An inclined plate 342 is hinged to the inner side of the fixed ring 341. The middle part of the inclined plate 342 is hinged to the lower end of the rotating platform 1, and the other end of the inclined plate 342 is hinged to the cross 333. When the cylinder 334 drives the cross 333 to rise, the swing of the inclined plate 342 drives the fixed ring 341 to move radially, thereby pushing the slider to slide along the fixed ring 341, causing the inverted U-shaped frame 340 to generate a linkage displacement. This displacement is transmitted from the vertical section to the horizontal section, and through the rotating shaft 339, it drives the upper moving frame 336 and the pre-pressing mechanism to move downward, realizing flexible pressing and weld clamping of the upper surface of the top plate. Please refer to Figure 8To further improve the connection stability of the corner welds between the upper galvanized sheet and the surrounding side plates, Z-shaped brackets 343 are installed in the four corner areas of the upper movable frame 336. The lower horizontal section of the Z-shaped bracket 343 has an installation groove, and a connecting block 344 is slidably connected in the installation groove. A triangular pressure block 345 is fixedly connected to the lower end of the connecting block 344. A telescopic spring 346 is provided between the connecting block 344 and the groove wall of the installation groove to provide an inward elastic preload.

[0043] During operation, the moving frame 336 drives the Z-shaped bracket 343 to move downwards synchronously, and the triangular pressure block 345 moves down and approaches the edge of the top plate. At this time, no clamping force has been applied. As the clamping action continues, the pushing column 324 drives the fixed bracket 323 to move towards the center. The fixed bracket 323 is equipped with a push rod 350 for pressing against the triangular pressure block 345. The push rod 350 can approach the triangular pressure block 345. When the push rod 350 contacts the inclined surfaces on both sides of the triangular pressure block 345, the further movement of the fixed bracket 323 generates a thrust perpendicular to the inclined surface. This thrust is decomposed into an outward expansion force, which overcomes the elastic force of the telescopic spring 346 and pushes the connecting block 344 to drive the triangular pressure block 345 to slide outwards along the mounting groove, thereby pressing it against the corner area of ​​the top plate and the side plate. This not only effectively closes the splicing gap, but also smooths out local warping caused by assembly or deformation, ensuring that the corner fits tightly.

[0044] Please refer to Figure 11 To improve the stability of the weld preloading mechanism 32 and the operating accuracy of the welding torch during welding, a limiting slot 347 is provided on the inclined surface of the cylindrical extrusion table 321 in the outer ring assembly. The welding torch end of the welding robot 2 is provided with a guide bracket 21, which slides in conjunction with the limiting slot 347. During welding, as the welding torch moves along the weld, the guide bracket 21 slides synchronously within the limiting slot 347. On the one hand, the limiting slot 347 applies radial and axial constraints to the cylindrical extrusion table 321 to prevent it from shifting under pressure, thereby enhancing the stability of the weld preloading mechanism 32. On the other hand, the guide bracket 21 provides additional support and guidance through the limiting slot 347, effectively suppressing the vibration and trajectory drift of the welding torch under high-speed travel or arc impact, ensuring that the welding torch always runs stably along the predetermined path.

[0045] In actual operation (use), firstly, four vertical galvanized plates to be welded are placed on the rotating platform 1, so that they are positioned between the two sets of positioning plates 31 on the inner and outer rings respectively. Then, the cylinder 334 is started, pushing the cross 333 to move vertically upward. The cross 333 drives the inverted V-shaped control rod 332 hinged at both ends to rise synchronously. The control rod 332 swings outward, thereby driving the push frame 330 on the inner and outer sides to move radially towards each other. The push frame 330 pushes the guide groove plate through the elastic telescopic rod 331, causing the positioning plate 31 to swing around its hinge point, gradually clamping the inner and outer edges of the galvanized plate, realizing precise centering and stable positioning of its verticality and circumferential position. During the positioning process, a fifth galvanized plate can be placed between the upper ends of the four vertical plates to form a closed prefabricated box structure. At this time, the weld pre-pressing mechanism 32 located above moves synchronously with the moving frame 336 to apply pre-pressure to the top plate to achieve initial limiting. Simultaneously, the pusher 330 drives the pusher column 324 in the weld pre-pressing mechanism 32 to move via the connecting rod 329, so that the cylindrical extrusion table 321 of the outer ring group acts on the fillet weld area between the side plate and the top plate to achieve point contact local pressure. The corresponding structure of the inner ring moves synchronously to ensure that each joint is evenly fitted and forms a stable pre-pressing state. Subsequently, the welding robot 2 starts and moves along the weld path to continuously and evenly weld the vertical weld on one side and the horizontal weld on the top that has been pre-pressed. After welding is completed, the rotating platform 1 rotates 90° to move the workpiece to the next station and repeats the pre-pressing and welding actions until all four welds are completed. After welding is completed, the cylinder 334 drives the cross 333 to move down and reset, the control rod 332 retracts, the pusher 330 resets synchronously, and the positioning plate 31 and the weld pre-pressing mechanism 32 release synchronously to release the clamping of the workpiece, making it easier to take out the finished box and prepare for the next round of workpiece clamping.

[0046] Example 2, please refer to this example. Figure 12 and Figure 13 .

[0047] The difference between this embodiment and Embodiment 1 is that the extrusion head here consists of two extrusion plates 348 that are hinged to each other. The extrusion plates 348 are hinged to a fixed plate 349 connected to a sliding column 322. The hinge axes of the two extrusion plates 348 are perpendicular to the surface of the corresponding galvanized sheet. As the extrusion plates 348 approach the galvanized sheet, the two extrusion plates 348 are forced open when they contact the sheet surface and respectively adhere to the sheet surface on both sides of the weld. Under the action of thrust, they synchronously rotate in opposite directions, thereby applying a smoothing pressure from the inside out to the sheet surface, effectively eliminating local warping or wave deformation caused by processing or handling, and achieving flexible pressing and uniform support for the weld area.

[0048] In the two sets of extrusion heads set on opposite sides of the weld, the extrusion plates 348 are arranged in an alternating manner, which avoids structural interference and expands the support range. This allows the galvanized sheets on both sides of the weld to obtain multiple discrete support points in the height direction, forming a multi-point coordinated stable clamping surface, which significantly improves the overall rigidity of the galvanized sheet during the welding process.

[0049] On the other hand, the present invention also provides a multi-dimensional precision welding method for galvanized sheets, applicable to multi-dimensional precision welding devices for galvanized sheets, combined with... Figure 1 and Figure 2 This includes the following steps: Step 1: Place the four vertical galvanized sheets to be welded on the top of the rotating platform 1, so that they are positioned between the two sets of positioning plates 31 on the inner and outer rings respectively. Step 2: Control the inner and outer positioning plates 31 to swing synchronously in opposite directions, clamp the inner and outer edges of the vertically placed galvanized sheet, and achieve dual positioning of its verticality and circumferential position. During the positioning process, the fifth galvanized sheet is placed between the upper ends of the four vertical plates to form a closed prefabricated box structure. Step 3: The weld pre-pressing mechanism 32 moves synchronously with the positioning plate 31, causing the extrusion heads corresponding to each weld position to move synchronously, applying local pressure to the weld area of ​​the galvanized sheet to form a stable pre-pressing state. Step 4: Control the welding robot 2 to move along the weld path and perform continuous and uniform welding on the pre-pressed weld. After completing the welding of the vertical weld on one side and the horizontal weld at the top, drive the rotating platform 1 to rotate 90 degrees and move the prefabricated box workpiece into the next welding station. Repeat the welding until all welds are completed.

[0050] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0051] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A multi-dimensional precision welding device for galvanized sheet, characterized in that, Include: Welding robot (2); Rotary platform (1) for carrying galvanized sheet workpieces to be welded and capable of active rotation; Positioning plate (31) is arranged above the rotary platform (1), and a plurality of groups are uniformly arranged along the circumference of the rotary platform (1), the positioning plate (31) is divided into inner ring group and outer ring group, the two groups of positioning plates (31) can move towards or away from each other along the radial direction to space align and clamp a plurality of galvanized sheets to assemble into a prefabricated box structure; Welding pre-pressing mechanism (32) is circumferentially distributed outside the positioning plate (31), including extrusion heads uniformly distributed along the joint path, the extrusion heads can implement point contact type local pressure on the joint area of adjacent plates before welding starts, realizing local stable clamping of the weld area.

2. The multi-dimensional precision welding device for galvanized sheet according to claim 1, characterized in that, The extrusion head is a cylindrical extrusion table (321), the axis of the cylindrical extrusion table (321) is perpendicular to the extension direction of the weld, for applying local pressure on both sides of the weld, in the two groups of cylindrical extrusion tables (321) arranged on the opposite sides of the weld, the side away from the weld of each is provided with an inclined surface, and the two inclined surfaces are oppositely arranged and constitute a sliding fit pair.

3. The multi-dimensional precision welding device for galvanized sheet according to claim 2, characterized in that, A limiting clamping groove (347) is formed on the inclined surface of the cylindrical extrusion table (321) in the outer ring group, and the end of the welding gun of the welding robot (2) is provided with a guide bracket (21) in sliding fit with the limiting clamping groove (347).

4. The multi-dimensional precision welding device for galvanized sheet according to claim 1, characterized in that, The extrusion head is two extrusion plates (348) hinged to each other, the hinge axis of the two extrusion plates (348) is perpendicular to the plate surface of the corresponding galvanized sheet, and the two groups of extrusion plates (348) arranged on the opposite sides of the weld are arranged in an upper and lower staggered manner.

5. The multi-dimensional precision welding device for galvanized sheet according to claim 2 or 4, characterized in that, The side away from the weld of the extrusion head is fixedly connected with a slide column (322), the slide columns (322) are commonly slid through a same fixed bracket (323), a push column (324) is slidably installed on the fixed bracket (323), a jacking rod (325) is installed at one end of the push column (324) towards the extrusion head, the jacking rod (325) is used for abutting against the end of the corresponding slide column (322), and a supporting spring (326) is arranged between the section of the slide column (322) penetrating through the fixed bracket (323) and the fixed bracket (323).

6. The multi-dimensional precision welding device for galvanized sheet according to claim 5, characterized in that, The middle part of each push column (324) corresponding to the vertically placed galvanized sheet is hinged with a connecting rod (329), and a plurality of connecting rods (329) located outside the same side positioning plate (31) are commonly hinged to a same push frame (330); The positioning plate (31) is hinged to the rotary platform (1), a guide groove plate is installed thereon, an elastic telescopic rod (331) is installed on the push frame (330), and the movable end of the elastic telescopic rod (331) is hinged to the guide groove plate and slidably fitted along the groove length direction of the guide groove plate.

7. The multi-dimensional precision welding device for galvanized sheet according to claim 6, characterized in that, The side, away from each other, of the two groups of push frames (330) is hingedly connected with a control rod (332), the other end of the two control rods (332) is inclinedly extended to the middle and is commonly hingedly connected with the upper end of a cross frame (333), the two control rods (332) are symmetrically arranged in inverted V shape, an active through slot extending in the radial direction is formed on the rotating platform (1) for avoiding the movement of the control rod (332), and the lower end of the cross frame (333) is fixedly connected with the telescopic rod of a pneumatic cylinder (334).

8. The multi-dimensional precision welding device for galvanized sheet according to claim 7, characterized in that, The side, close to the central axis, of each push column (324) corresponding to the uppermost galvanized plate and located on the same horizontal plane is hingedly connected with a side rod (335), the other end of each side rod (335) is commonly hingedly connected with a moving frame (336) through a torsion spring rod, the lower end of the moving frame (336) located at the lower side is provided with a push rod (337), the push rod (337) is extended downward and is fixedly connected with the cross frame (333) after slidingly penetrating the rotating platform (1); The upper end of the moving frame (336) located at the upper side is fixedly connected with a rotating shaft (339), the rotating shaft (339) is rotatably installed at the lower end of the horizontal section of an inverted character U-shaped frame (340), the lower end of the vertical section of the inverted character U-shaped frame (340) is hingedly connected with a sliding block, the sliding block is slidingly arranged on the upper end of a fixed ring (341), the inner side of the fixed ring (341) is hingedly connected with an inclined plate (342), the middle part of the inclined plate (342) is hingedly connected with the lower end of the rotating platform (1), and the other end of the inclined plate (342) is hingedly connected with the cross frame (333).

9. The multi-dimensional precision welding device for galvanized sheet according to claim 8, characterized in that, The four corner regions of the moving frame (336) located at the upper side are respectively provided with Z-shaped supports (343), the lower end of the lower side horizontal section of each Z-shaped support (343) is provided with a mounting groove, a connecting block (344) is slidingly connected in the mounting groove, the lower end of the connecting block (344) is fixedly connected with a triangular pressing block (345), a telescopic spring (346) is arranged between the connecting block (344) and the groove wall of the mounting groove, and a corresponding fixed support (323) is provided with a resisting rod (350) for resisting the triangular pressing block (345).

10. A method for multi-dimension precision welding of galvanized sheet, suitable for the multi-dimension precision welding device of any one of claims 1 to 9, characterized in that, The method comprises the following steps: Step one: four vertical galvanized plates to be welded are placed on the upper end of the rotating platform (1) and are located between the two groups of positioning plates (31) of the inner circle and the outer circle; Step two: the two groups of positioning plates (31) are synchronously swung towards each other to clamp the inner and outer side edges of the vertically placed galvanized plates, the verticality and the circumferential position of the galvanized plates are double positioned, in the positioning process, the fifth galvanized plate is erected between the upper ends of the four vertical plates to form a closed prefabricated box structure; Step three: the welding seam pre-pressing mechanism (32) is synchronously actuated with the positioning plates (31), the extrusion heads corresponding to the positions of the welding seams are synchronously actuated, the local pressure of the galvanized plate welding seam area is increased, and a stable pre-pressing state is formed; Step four: the welding robot (2) is controlled to travel along the welding seam path, the welding seam which has completed the pre-pressing is continuously and uniformly welded, after the vertical welding seam and the top horizontal welding seam on one side are welded, the rotating platform (1) is driven to rotate by 90 degrees, the prefabricated box workpiece is brought into the next welding station, the welding is repeated, and all the welding seams are welded.

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