A laser welding positioning device for a roof header assembly

Abstract

The application discloses a laser welding positioning device of a roof front cross beam assembly and belongs to the technical field of welding tools.The positioning device comprises a rack, a rack plate is arranged above the rack, at least two symmetrically arranged first support frames are arranged on the rack plate, positioning columns are arranged on the first support frames and are inserted into workpieces, a second support frame corresponding in number to the first support frames is arranged on one side of the first support frames, an auxiliary support plate is detachably connected to the side of the second support frame, one end of the auxiliary support plate is connected to the second support frame, and the other end of the auxiliary support plate abuts against the workpiece on the first support frame.The scheme solves the problems of insufficient positioning precision and poor clamping stability of the existing laser welding positioning device and is suitable for the complex three-dimensional curved surface structure of the roof front cross beam assembly.

Description

Technical Field

[0001] This invention relates to the field of welding tool technology, and more specifically to a laser welding positioning device for a top cover front crossbeam assembly. Background Technology

[0002] In the automotive manufacturing industry, the roof front crossbeam assembly is a crucial component of the vehicle body structure, and its welding quality directly impacts the safety and stability of the entire vehicle. Laser welding, with its advantages of concentrated energy, high welding speed, and small heat-affected zone, is widely used in the processing of such components. However, existing laser welding positioning devices for roof front crossbeam assemblies still suffer from insufficient positioning accuracy or poor clamping stability in practical applications. Traditional positioning devices often employ a single support structure, which is difficult to adapt to the complex three-dimensional curved surface structure of the roof front crossbeam assembly. During the welding process, the workpiece is prone to displacement due to uneven stress, leading to weld position deviations and affecting welding strength. Furthermore, for crossbeam assemblies composed of multiple components, the clamping mechanism of existing devices is usually structurally fixed and cannot be flexibly adjusted to meet the welding requirements of different parts. Especially under the high temperature of laser welding, the workpiece is prone to thermal deformation, leading to positioning failure. Existing technologies offer numerous solutions to the problems associated with laser welding. For example, existing technology KR1020240068625A discloses a laser welding method for steel plates, which allows bipolar plates to be welded at high speed in a vertically positioned rotating conveyor, thus largely meeting the high requirements for loading, fixing, welding, and unloading of components. However, this device still has room for improvement in achieving precise workpiece clamping and ensuring workpiece welding quality. Summary of the Invention

[0003] The purpose of this invention is to provide a laser welding positioning device for the front crossbeam assembly of the top cover, which solves the problems of insufficient positioning accuracy and poor clamping stability of existing laser welding positioning devices, so as to adapt to the complex three-dimensional curved surface structure of the front crossbeam assembly of the top cover.

[0004] To solve the above-mentioned technical problems, the present invention specifically provides the following technical solution: a laser welding positioning device for a front crossbeam assembly of a top cover, including a frame, a frame plate above the frame, at least two symmetrically arranged first support frames on the frame plate, positioning columns that are inserted into the workpiece on the first support frame, a second support frame corresponding to the number of the first support frame on one side, an auxiliary support plate detachably connected to the side of the second support frame, one end of the auxiliary support plate being connected to the second support frame, and the other end abutting against the workpiece on the first support frame.

[0005] The frame and support plate of this invention constitute the basic load-bearing structure, ensuring overall rigidity. Positioning columns on two symmetrically arranged first support frames are inserted into the workpiece to form an initial positioning reference, utilizing the symmetrical structure to offset lateral stress during welding. The number of second support frames corresponds to the first support frames. One end of a detachable auxiliary support plate on its side is connected to the second support frame, and the other end abuts against the side of the workpiece, forming a three-point positioning support system. Specifically, the positioning columns restrict vertical displacement of the workpiece, and the abutment surface of the auxiliary support plate restricts horizontal offset. Combined with the symmetrically arranged first support frames, this effectively addresses the complex curved surface structure of the front crossbeam assembly of the top cover, reducing welding offset caused by uneven stress on the workpiece and controlling weld position deviation within 0.5mm. Simultaneously, the detachable auxiliary support plate can be flexibly adjusted according to the workpiece size, improving the device's adaptability to workpieces of different specifications.

[0006] According to one embodiment of the present invention, a clamping and positioning assembly is rotatably connected to the upper end of the second support frame. The clamping and positioning assembly includes a rotating rod that can rotate relative to the second support frame, and a first assembly pressure rod is detachably connected to the end of the rotating rod. The present invention configures the upper end of the second support frame as a rotatable connection, allowing the rotating rod to rotate 0-90° relative to the second support frame around its axis, thereby adjusting the first assembly pressure rod at the end to different angles to precisely fit the three-dimensional curved surface contour of the top cover front crossbeam assembly. When clamping different workpieces, the curvature of the clamping surface changes, and by rotating the rotating rod, the pressing surface of the first assembly pressure rod remains perpendicular to the workpiece surface, ensuring uniform distribution of clamping force and avoiding workpiece deformation caused by angular deviations in traditional fixed clamping. The detachable connection structure between the rotating rod and the first assembly pressure rod can be quickly disassembled and assembled using M12 bolts. In addition, the solution of the present invention can replace the first assembly pressure rod with different lengths or cross-sectional shapes according to the size of the workpiece welding part, such as L-shaped or U-shaped pressure rods. For example, when welding the corner of the crossbeam, a short-arm pressure rod can be replaced to avoid the working space of the laser welding head, thereby improving the adaptability of the device to complex workpiece structures and improving the clamping and positioning efficiency.

[0007] According to one embodiment of the present invention, at least one limiting block is provided on the bottom surface of the first assembly pressure rod. The limiting block of the present invention adopts an L-shaped structure, with its long side connected to the bottom surface of the first assembly pressure rod by fasteners, and its vertical part tightly abutting against the surface of the workpiece. When the workpiece is placed on the positioning post of the first support frame, the clamping and positioning assembly is rotated to make the vertical part of the limiting block fit against the edge or corner of the part of the workpiece to be welded. Utilizing the right-angle characteristics of the L-shaped structure, the displacement of the workpiece in both the horizontal and vertical directions is restricted. That is, the vertical side abuts against the side of the workpiece to prevent lateral sliding, and the long side presses against the top surface of the workpiece to suppress vertical jump, forming a two-dimensional limiting. If the workpiece structure is complex, two or more limiting blocks are provided on the bottom surface of the first assembly pressure rod, corresponding to the limiting points on different surfaces of the workpiece. In addition, the detachable connection design between the limiting block and the first assembly pressure rod allows for the replacement of limiting blocks of different sizes according to the workpiece contour. For example, the length of the vertical side can be adjusted to adapt to workpieces of different thicknesses, enhancing the positioning adaptability of the device to diverse workpieces and ensuring that the workpiece remains in a precise positioning state during laser welding.

[0008] According to one embodiment of the present invention, the limiting pressure block has an L-shaped structure, with its long side connected to the first assembly pressure rod by fasteners, and its vertical part abutting against the surface of the workpiece. Two or more blocks can be used to achieve compaction of different surfaces of the workpiece. The long side of the limiting pressure block is fixedly connected to the bottom surface of the first assembly pressure rod by bolts or other fasteners, and the vertical part extends vertically at 90° and abuts tightly against the surface of the workpiece. The L-shaped right-angle structure forms a bidirectional limiting effect, and a single limiting pressure block can achieve two-dimensional constraint on a single side angle of the workpiece. When the workpiece structure is complex, two or more limiting pressure blocks can be arranged on the bottom surface of the first assembly pressure rod. For example, two limiting pressure blocks can be arranged simultaneously at the corner of the front crossbeam assembly of the top cover, corresponding to the upper plane and side elevation of the crossbeam, respectively. The detachable design of the fastener connection allows adjustment of the installation angle and position of the limiting pressure block according to the surface contour of the workpiece.

[0009] According to one embodiment of the present invention, a clamping member is provided on the bottom surface of the first assembly pressure rod. The clamping member includes a connecting column that is threadedly connected to the first assembly pressure rod. A clamping base is provided at the bottom of the connecting column. A first damping plate is connected to the bottom surface of the clamping base by fasteners. A plurality of clamping pressure plates connected end-to-end are connected to the edge of the first damping plate. The connecting column of the clamping member of the present invention is threadedly connected to the bottom surface of the first assembly pressure rod. This allows the extension length to be adjusted by screwing according to the workpiece thickness, so that the clamping base and the workpiece surface maintain a set distance. At the same time, the threaded connection makes it more convenient to disassemble and replace, and the detachable connection is more convenient. The bottom surface of the clamping base is connected to the first damping plate via bolts or other fasteners. The internal damping material absorbs high-frequency vibrations during welding, preventing workpiece displacement. Multiple clamping plates surrounding the edge of the first damping plate form a closed loop structure. When pressed against the workpiece surface, each clamping plate independently adapts to the workpiece's curvature, applying clamping force uniformly through elastic deformation. Compared to traditional rigid clamping structures, this reduces the depth of indentation on the workpiece surface, while the closed loop structure minimizes errors in circumferential workpiece displacement. Furthermore, the detachable connection between the clamping plates and the first damping plate allows for the replacement of clamping plates with different curvatures based on the shape of the workpiece's welding area, enhancing the device's adaptability to complex workpiece shapes and ensuring stable clamping throughout the laser welding process.

[0010] According to one embodiment of the present invention, one end of the clamping pressure plate is connected to a first damping plate, and the other end is connected to an adjacent clamping pressure plate. When pressed against the surface of the workpiece, each clamping pressure plate can independently adapt to the curved surface of the workpiece based on the degree of freedom of movement at the connection point, such as the arc or broken contour of the front crossbeam of the top cover. Through linkage deformation, the entire clamping ring is made to uniformly fit the outer periphery of the workpiece, thereby improving the uniformity of clamping force distribution. When the curvature of the workpiece surface changes at a certain part, the adjacent clamping pressure plates can be adjusted by a slight rotation or elastic deformation at the connection point, avoiding workpiece indentation or deformation caused by single-point stress concentration.

[0011] According to one embodiment of the present invention, the bottom surface of the clamping pressure plate is uniformly distributed with assembly columns, each assembly column having an annular groove and a suction cup mounted thereon. The assembly columns, evenly distributed on the bottom surface of the clamping pressure plate, form a regular array. The annular groove on each assembly column is used to elastically engage the suction cup, allowing the suction cup to both adhere to the workpiece surface through negative pressure and adaptively fine-tune its angle based on the movable gap of the annular groove, adapting to the curved contour of the front crossbeam assembly of the top cover. The annular groove structure allows the suction cup to float slightly during welding vibrations. The double buffering effect of the rubber material of the suction cup and the gap of the annular groove prevents deviations in the weld position during laser welding.

[0012] According to one embodiment of the present invention, the second support frame and the rotating rod are respectively provided with corresponding rhomboid or toothed through slots, and corresponding insert rods are inserted into the rhomboid or toothed through slots. A pull rod is connected to the side of the insert rod. The angle locking of the rotating rod within the range of 0-90° is achieved by inserting and pulling the insert rod. That is, when the pull rod is pulled out to remove the insert rod, the rotating rod can rotate freely around the axis to adapt to the curvature angle of the front crossbeam assembly of the top cover; after the insert rod is inserted, it is locked, thus avoiding angle displacement caused by vibration during welding.

[0013] According to one embodiment of the present invention, a control box is installed on one side of the frame. The control box integrates a PLC control system and a relay module, and is connected to the hydraulic cylinders, drive motors and other actuators on the frame via cables, enabling precise control of the lifting and lowering displacement of the positioning column.

[0014] According to one embodiment of the present invention, a hydraulic cylinder is provided on the first support frame, and a slider is provided at the telescopic end of the hydraulic cylinder. A positioning post is provided on the slider. An infrared rangefinder is provided on the first support frame and connected to the control box. The hydraulic cylinder built into the first support frame is controlled by the control box. When the workpiece size or curvature of the front crossbeam assembly of the top cover changes, the positioning post is driven to accurately fit the positioning hole or contour of the workpiece. The hydraulic cylinder pushes the slider to make the extension length of the positioning post adaptively adjusted. Attached Figure Description

[0015] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of a laser welding positioning device for a front crossbeam assembly of a roof according to the present invention;

[0017] Figure 2 This is a schematic diagram of the connection structure between the clamping and positioning component and the second support frame of the present invention;

[0018] Figure 3 This is a schematic diagram of the connection scheme between the first assembly pressure rod and the limiting pressure block of the present invention;

[0019] Figure 4 This is a schematic diagram of the limiting and pressing block scheme of the present invention;

[0020] Figure 5 This is a schematic diagram of the clamping component structure of the present invention;

[0021] Figure 6 This is a schematic diagram of the clamping pressure plate scheme of the present invention;

[0022] Figure 7 This is a schematic diagram of the connection scheme between the clamping plate and the suction cup of the present invention;

[0023] Figure 8 This is a schematic diagram of the first placement state of the purging assembly of the present invention;

[0024] Figure 9 A schematic diagram of the second placement state of the purge assembly of the invention;

[0025] Figure 10 This is a schematic diagram of the internal structure of the purging assembly of the present invention;

[0026] Figure 11 This is a schematic diagram of the connection scheme between the first ring body and the guide column sleeve of the present invention.

[0027] Explanation of reference numerals in the attached drawings: 10. Frame; 11. Frame plate; 12. First support frame; 13. Second support frame; 14. Control box; 15. Positioning column; 20. Auxiliary support plate; 30. Clamping and positioning assembly; 31. Rotating rod; 32. First assembly pressure rod; 33. Limiting pressure block; 34. Pull rod; 40. Clamping component; 41. Clamping base; 42. First damping plate; 43. Connecting column; 44. Clamping pressure plate; 45. Suction cup; 46. Extension block; 47. Assembly column; 50. Purge assembly; 51. Purge housing; 52. Mounting side plate; 53. Mounting base plate; 54. Drive motor; 55. First blade; 56. Second blade; 57. Fixed connecting rod; 58. Guide column sleeve; 59. First ring body; 510. Swinging bar plate; 511. Extension column. Detailed Implementation

[0028] 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.

[0029] The concepts involved in this application will first be described with reference to the accompanying drawings. It should be noted that the following descriptions of various concepts are only for the purpose of making the content of this application easier to understand and do not constitute a limitation on the scope of protection of this application; furthermore, the embodiments and features in the embodiments of this application can be combined with each other unless otherwise specified. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0030] Example 1:

[0031] As shown in the attached figure Figure 1 -Appendix Figure 7As shown, the present invention provides a laser welding positioning device for a front crossbeam assembly of a top cover, including a frame 10, a frame plate 11 above the frame 10, at least two symmetrically arranged first support frames 12 on the frame plate 11, positioning posts 15 that are inserted into the workpiece on the first support frame 12, and a second support frame 13 corresponding to the number of the first support frame 12 on one side, and an auxiliary support plate 20 detachably connected to the side of the second support frame 13, one end of the auxiliary support plate 20 being connected to the second support frame 13, and the other end abutting against the workpiece on the first support frame 12.

[0032] The frame 10 and the support plate 11 of this invention constitute the basic load-bearing structure, ensuring overall rigidity. The positioning columns 15 on the two symmetrically arranged first support frames 12 are inserted into the workpiece to form an initial positioning reference, and the symmetrical structure is used to offset the lateral stress during welding. The number of second support frames 13 corresponds to that of the first support frames 12. One end of the detachable auxiliary support plate 20 on its side is connected to the second support frame 13, and the other end abuts against the side of the workpiece, forming a three-point positioning support system. Specifically, the positioning columns 15 restrict the vertical displacement of the workpiece, and the abutment surface of the auxiliary support plate 20 restricts the horizontal offset. Together with the symmetrically arranged first support frames 12, it effectively copes with the complex curved surface structure of the front crossbeam assembly of the top cover, reduces the welding offset caused by uneven stress on the workpiece, and controls the weld position deviation within 0.5mm. At the same time, the detachable auxiliary support plate 20 can be flexibly adjusted according to the size of the workpiece, improving the adaptability of the device to workpieces of different specifications.

[0033] The upper end of the second support frame 13 is rotatably connected to a clamping and positioning assembly 30. The clamping and positioning assembly 30 includes a rotating rod 31 that can rotate relative to the second support frame 13, and a first assembly pressure rod 32 is detachably connected to the end of the rotating rod 31. This invention configures the upper end of the second support frame 13 with a rotatable connection, allowing the rotating rod 31 to rotate 0-90° relative to the second support frame 13 around its axis. This, in turn, adjusts the first assembly pressure rod 32 at its end to different angles, precisely conforming to the three-dimensional curved surface contour of the top cover front crossbeam assembly. When clamping different workpieces, the curvature of the clamping surface changes. By rotating the rotating rod 31, the pressing surface of the first assembly pressure rod 32 remains perpendicular to the workpiece surface, ensuring a uniform distribution of clamping force and avoiding workpiece deformation caused by angular deviations in traditional fixed clamping. The detachable connection structure between the rotating rod 31 and the first assembly pressure rod 32 can be quickly disassembled and assembled using M12 bolts. In addition, the solution of the present invention can replace the first assembly pressure rod 32 with different lengths or cross-sectional shapes according to the size of the workpiece welding part, such as L-shaped or U-shaped pressure rods. For example, when welding the corner of the crossbeam, a short-arm pressure rod can be used to avoid the working space of the laser welding head, thereby improving the adaptability of the device to complex workpiece structures and improving the clamping and positioning efficiency.

[0034] At least one limiting block 33 is provided on the bottom surface of the first assembly pressure rod 32. The limiting block 33 of the present invention adopts an L-shaped structure, with its long side connected to the bottom surface of the first assembly pressure rod 32 by fasteners, and its vertical part tightly abutting against the surface of the workpiece. When the workpiece is placed on the positioning post 15 of the first support frame 12, the clamping and positioning assembly 30 is rotated to make the vertical part of the limiting block 33 fit against the edge or corner of the part of the workpiece to be welded. Utilizing the right-angle characteristic of the L-shaped structure, the displacement of the workpiece in both the horizontal and vertical directions is restricted at the same time. That is, the vertical side abuts against the side of the workpiece to prevent lateral sliding, and the long side presses against the top surface of the workpiece to suppress vertical jump, forming a two-dimensional limiting. If the workpiece structure is complex, two or more limiting blocks 33 are provided on the bottom surface of the first assembly pressure rod 32, corresponding to the limiting points on different surfaces of the workpiece. In addition, the detachable connection design between the limiting pressure block 33 and the first assembly pressure rod 32 allows for the replacement of the limiting pressure block 33 of different sizes according to the workpiece contour. For example, the vertical side length can be adjusted to adapt to workpieces of different thicknesses, which enhances the device's adaptability to the positioning of diverse workpieces and ensures that the workpiece always maintains a precise positioning state during the laser welding process.

[0035] The limiting pressure block 33 has an L-shaped structure. Its long side is connected to the first assembly pressure rod 32 by fasteners, and its vertical part abuts against the workpiece surface. Two or more blocks can be used to achieve compaction of different workpiece surfaces. The long side of the limiting pressure block 33 is fixedly connected to the bottom surface of the first assembly pressure rod 32 by bolts or other fasteners. The vertical part extends vertically at 90° and abuts tightly against the workpiece surface. The L-shaped right-angle structure forms a bidirectional limiting effect, allowing a single limiting pressure block 33 to achieve two-dimensional constraint on a single corner of the workpiece. When the workpiece structure is complex, two or more limiting pressure blocks 33 can be arranged on the bottom surface of the first assembly pressure rod 32. For example, two limiting pressure blocks 33 can be arranged simultaneously at the corner of the front crossbeam assembly of the top cover, corresponding to the upper plane and side elevation of the crossbeam, respectively. The detachable design of the fastener connection allows adjustment of the installation angle and position of the limiting pressure block 33 according to the workpiece surface contour.

[0036] The bottom surface of the first assembly pressure rod 32 is provided with a clamping member 40, which includes a connecting column 43 that is threadedly connected to the first assembly pressure rod 32. The bottom of the connecting column 43 is provided with a clamping base 41, and the bottom surface of the clamping base 41 is connected to the first damping plate 42 by fasteners. The edge of the first damping plate 42 is connected to a plurality of clamping pressure plates 44 connected end to end. The connecting column 43 of the clamping member 40 of the present invention is threadedly connected to the bottom surface of the first assembly pressure rod 32. In this way, the extension length can be adjusted by screwing according to the thickness of the workpiece, so that the clamping base 41 and the workpiece surface maintain a set distance. At the same time, the threaded connection makes it more convenient to disassemble and replace. The bottom surface of the clamping base 41 is connected to the first damping plate 42 via bolts or other fasteners. The internal damping material absorbs high-frequency vibrations during welding, preventing workpiece displacement due to vibration. Multiple clamping pressure plates 44 surrounding the edge of the first damping plate 42 form a closed-loop structure. When pressed against the workpiece surface, each clamping pressure plate 44 can independently adapt to the workpiece's curvature, applying clamping force uniformly through elastic deformation. Compared to traditional rigid clamping structures, this reduces the depth of indentation on the workpiece surface, while the closed-loop structure reduces errors in the workpiece's circumferential displacement. Furthermore, the detachable connection between the clamping pressure plates 44 and the first damping plate 42 allows for the replacement of clamping pressure plates 44 with different curvatures according to the shape of the workpiece's welding area, improving the device's adaptability to complex workpiece shapes and ensuring the workpiece remains stably clamped during laser welding.

[0037] One end of the clamping pressure plate 44 is connected to the first damping plate 42, and the other end is connected to the adjacent clamping pressure plate 44. When pressed against the workpiece surface, each clamping pressure plate 44 can independently adapt to the workpiece surface based on the degree of freedom of movement at the connection point, such as the arc or broken contour of the front crossbeam of the top cover. Through linkage deformation, the entire clamping ring is made to uniformly fit the outer circumference of the workpiece, thereby improving the uniformity of clamping force distribution. When the curvature of the workpiece surface changes at a certain part, the adjacent clamping pressure plates 44 can be adjusted by a small rotation or elastic deformation at the connection point to avoid workpiece indentation or deformation caused by single-point stress concentration.

[0038] The bottom surface of the clamping plate 44 is evenly distributed with assembly columns 47, each with an annular groove. Suction cups 45 are installed within these grooves, clamping the evenly distributed assembly columns 47 in a regular array. The annular grooves on each assembly column 47 elastically engage the suction cups 45, allowing the suction cups 45 to both adhere to the workpiece surface through negative pressure and adaptively fine-tune their angle based on the movable gap of the annular grooves, adapting to the curved contours of the top cover front crossbeam assembly. The annular groove structure allows the suction cups 45 to float slightly during welding vibrations. The double buffering effect of the rubber material of the suction cups 45 and the annular groove gaps prevents deviations in the weld position during laser welding.

[0039] The second support frame 13 and the rotating rod 31 are respectively provided with corresponding diamond-shaped or toothed through slots, and corresponding insert rods are inserted into the diamond-shaped or toothed through slots. A pull rod 34 is connected to the side of the insert rod. The angle of the rotating rod 31 can be locked within the range of 0-90° by inserting and pulling the insert rod. That is, when the pull rod 34 is pulled to pull out the insert rod, the rotating rod 31 can rotate freely around the axis to adapt to the curvature angle of the front crossbeam assembly of the top cover; after the insert rod is inserted, it is locked, thus avoiding angle displacement caused by vibration during welding.

[0040] A control box 14 is installed on one side of the frame 10. The control box 14 integrates a PLC control system and a relay module. It is connected to the hydraulic cylinder, drive motor 54 and other actuators on the frame 10 through cables, and can precisely control the lifting and displacement of the positioning column 15.

[0041] The first support frame 12 has a built-in hydraulic cylinder, with a slider mounted on its telescopic end. The positioning post 15 is fixed to the slider. Simultaneously, an infrared rangefinder is installed on the first support frame 12, connected to the control box 14. The hydraulic cylinder within the first support frame 12 is controlled by the control box 14, enabling precise control of the hydraulic cylinder, which in turn moves the slider, allowing the positioning post 15 to adjust its position according to actual needs. The infrared rangefinder monitors the relative position of the workpiece and the positioning post 15 in real time and transmits the data to the control box 14. The control box 14 controls the hydraulic cylinder's operation based on this data, ensuring accurate alignment between the positioning post 15 and the workpiece, achieving precise positioning. When the workpiece size or surface curvature of the front crossbeam assembly of the top cover changes, the positioning post 15 is driven to precisely fit the positioning hole or contour of the workpiece, and the hydraulic cylinder pushes the slider to adaptively adjust the extension length of the positioning post 15.

[0042] Example 2:

[0043] See appendix Figure 1 Appendix Figure 8 - Appendix Figure 11As shown, a purging assembly 50 is provided on the frame plate 11 of the frame 10. The purging assembly 50 includes a purging housing 51 with a rotating body structure. The purging housing 51 is through-connected at both ends, and its axis is perpendicular to the surface of the frame plate 11. The bottom of the purging housing 51 is spaced apart from the surface of the frame plate 11, and the specific distance is controlled by a connecting rod. The purging housing 51 has a horizontally arranged mounting side plate 52 on its side, and the frame plate 11 has a mounting base plate 53 corresponding to the position of the mounting side plate 52. The mounting side plate 52 and the mounting base plate 53 are connected by a connecting rod, so that there is a controllable distance between the bottom port of the purging housing 51 and the surface of the frame plate 11. The purging housing 51 with a rotating body structure of the present invention is through-connected at both ends, and its axis is arranged perpendicular to the surface of the frame plate 11, forming an axially through airflow channel. When the internal fan is started, it can generate a purging airflow to efficiently remove welding slag and debris from the surface of the purging target. The distance between the bottom of the blow-out housing 51 and the surface of the frame plate 11 is precisely controlled by the connecting rod, which can prevent the bottom of the housing from being too close to the frame plate 11 and causing airflow obstruction. The horizontally arranged mounting side plate 52 is rigidly connected to the mounting base plate 53 on the frame plate 11 by the connecting rod, forming a stable support structure.

[0044] A drive motor 54 is installed at the center of the purge housing 51. The drive motor 54 is connected to the inner wall of the purge housing 51 via a mounting rod or a frame that allows airflow. A second blade 56 is arranged around the outer side of the output shaft of the drive motor 54. A guide column sleeve 58 is provided on the side of the second blade 56, coaxially connected to and penetrating the purge housing 51. A base shaft is provided at the center of the guide column sleeve 58. The base shaft is fixedly connected to the inner wall of the guide column sleeve 58 via a fixed connecting rod 57. A first blade 55 that can rotate relative to the base shaft is arranged around the side of the base shaft. The first blade 55 has an extension column 511 that passes through the guide column sleeve 58. One end of the extension column 511 is located outside the guide column sleeve 58 and is connected to a first ring 59 via a swing bar 510. The first ring 59 is sleeved on the outside of the guide column sleeve 58 and can be displaced relative to the guide column sleeve 58.

[0045] The drive motor 54 is fixed to the axis of the blow-off housing 51 by a mounting rod. When the second blade 56 on the outer side of its output end rotates, it generates an axial main airflow. Inside the coaxially arranged guide column sleeve 58, the base shaft is positioned by a fixed connecting rod 57, allowing the first blade 55 surrounding the base shaft to rotate freely. When the first ring 59 moves up and down along the outer wall of the guide column sleeve 58, the swing bar 510 drives the extension column 511, causing the first blade 55 to deflect synchronously, thereby guiding the airflow in different directions. This expands the airflow coverage area, ensuring the removal of welding debris and allowing for cooling of the workpiece surface temperature as needed, preventing thermal deformation.

[0046] In this embodiment, multiple blowing components 50 are arranged on the frame plate 11. At least one blowing component 50 has a guide column sleeve 58 adjacent to the frame plate 11, that is, the guide column sleeve 58 faces the frame plate 11 to blow away debris, welding slag, etc. on the frame plate 11. At least one blowing component 50 has a guide column sleeve 58 facing the workpiece direction to blow away debris, welding slag, and welding cooling from the surface of the workpiece.

[0047] The embodiments and / or implementation methods described above are merely preferred embodiments and / or implementation methods for implementing the technology of the present invention, and are not intended to limit the implementation methods of the technology of the present invention in any way. Any person skilled in the art can make some modifications or alterations to other equivalent embodiments without departing from the scope of the technical means disclosed in the content of the present invention, but they should still be regarded as the technology or embodiments that are substantially the same as the present invention.

[0048] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. The above descriptions are only preferred embodiments of this application. It should be noted that due to the limitations of written expression, while there are objectively infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of this application.

Claims

1. A laser welding positioning device for a front crossbeam assembly of a roof cover, comprising a frame (10), a support plate (11) above the frame (10), at least two symmetrically arranged first support frames (12) on the support plate (11), and positioning posts (15) for insertion into the workpiece on the first support frames (12), characterized in that, The first support frame (12) is provided with a second support frame (13) on one side, and an auxiliary support plate (20) is detachably connected to the side of the second support frame (13). One end of the auxiliary support plate (20) is connected to the second support frame (13), and the other end abuts against the workpiece on the first support frame (12). The upper end of the second support frame (13) is rotatably connected to a clamping and positioning assembly (30). The clamping and positioning assembly (30) includes a rotating rod (31) that can rotate relative to the second support frame (13). The end of the rotating rod (31) is detachably connected to a first assembly pressure rod (32). The bottom surface of the first assembly pressure rod (32) shall be provided with at least one limiting pressure block (33); When the workpiece is placed on the positioning post (15) of the first support frame (12), the clamping positioning assembly (30) is rotated to make the limiting pressure block (33) fit against the edge or corner of the workpiece to be welded. The bottom surface of the first assembly pressure rod (32) is provided with a clamping member (40). The clamping member (40) includes a connecting column (43) that is threadedly connected to the first assembly pressure rod (32). The bottom of the connecting column (43) is provided with a clamping base (41). The bottom surface of the clamping base (41) is connected to a first damping plate (42) by fasteners. The edge of the first damping plate (42) is connected to a plurality of clamping pressure plates (44) that are connected end to end. One end of the clamping pressure plate (44) is connected to the first damping plate (42), and the other end is connected to the adjacent clamping pressure plate (44); The bottom surface of the clamping plate (44) is evenly distributed with assembly columns (47), and the assembly columns (47) are provided with annular grooves and are equipped with suction cups (45). A purging assembly (50) is provided on the frame plate (11) of the frame (10). The purging assembly (50) includes a purging housing (51) with a rotating body structure. The two ends of the purging housing (51) are connected through each other. The axis of the purging housing (51) is perpendicular to the surface of the frame plate (11). The bottom of the purging housing (51) is spaced apart from the surface of the frame plate (11). The side of the purging housing (51) has a horizontally arranged mounting side plate (52). The frame plate (11) has a mounting base plate (53) corresponding to the position of the mounting side plate (52). The mounting side plate (52) and the mounting base plate (53) are connected by a connecting rod. A drive motor (54) is provided at the axial center inside the purge housing (51). The drive motor (54) is connected to the inner wall of the purge housing (51) via a mounting rod. A second blade (56) is arranged around the outer side of the output shaft of the drive motor (54). A guide column sleeve (58) is provided on the side of the second blade (56) and is coaxially connected to and penetrates the purge housing (51). A base shaft is provided at the axial center of the guide column sleeve (58). The base shaft is connected to the guide column sleeve (58) via a fixed connecting rod (57). 58) The inner wall is fixedly connected, and a first blade (55) that can rotate relative to it is arranged around the side of the base shaft. The first blade (55) has an extension column (511) that passes through the guide column sleeve (58). One end of the extension column (511) is located outside the guide column sleeve (58) and is connected to a first ring (59) through a swing bar (510). The first ring (59) is sleeved outside the guide column sleeve (58) and can be displaced relative to the guide column sleeve (58).

2. The laser welding positioning device for the front crossbeam assembly of the roof according to claim 1, characterized in that, The limiting pressure block (33) has an L-shaped structure, and its long side is connected to the first assembly pressure rod (32) by fasteners, while its vertical part abuts against the surface of the workpiece.

3. The laser welding positioning device for the front crossbeam assembly of the roof according to claim 1, characterized in that, The second support frame (13) and the rotating rod (31) are respectively provided with corresponding rhomboid or toothed through grooves, and the rhomboid or toothed through grooves are respectively inserted into the corresponding insertion rods, and the insertion rods are connected to the side of the pull rods (34).

4. The laser welding positioning device for the front crossbeam assembly of the roof according to claim 1, characterized in that, A control box (14) is installed on one side of the frame (10).

5. The laser welding positioning device for the front crossbeam assembly of the roof according to claim 1, characterized in that, The first support frame (12) is equipped with a hydraulic cylinder, and the extension end of the hydraulic cylinder is equipped with a slider, and the positioning column (15) is located on the slider.

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