Automatic welding device for automobile body parts

Abstract

The present invention belongs to the technical field of welding of automobile body parts, and specifically discloses an automatic welding device for automobile body parts, including a workpiece clamping assembly, a dual magnetic positioning mechanism, a hydraulic clutch mechanism, and a sliding welding mechanism, wherein the workpiece clamping assembly is provided with two groups, the dual magnetic positioning mechanism is symmetrically arranged at both ends of the workpiece clamping assembly, the hydraulic clutch mechanism is arranged at one end of the workpiece clamping assembly, and the sliding welding mechanism is arranged on the workpiece clamping assembly. The present invention is based on the principle that two points in a plane can determine a line segment, and the hydraulic clutch mechanism can only be combined after the magnetic pushing assemblies at both ends are adsorbed and triggered; and a magnetic unlocking assembly is proposed, which can only trigger the sliding of the central slide rod after the positions of the surrounding magnetic columns are corresponding, which can effectively solve the problem of mutual adsorption of magnetic suction cups when they partially overlap.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile body parts welding, and in particular relates to an automatic welding device for automobile body parts. Background Art

[0002] The car body is welded together from multiple independent stamping parts. Therefore, the welded areas are mostly where flat stamping parts overlap. Welding is then performed along the contact seam between the two parts. This can be spot welding or laser welding. The two workpieces need to be clamped and fixed before welding. Although the relative positions of the workpieces are accurate in most cases, it is still necessary to verify them through measurement. However, this increases the number of steps in actual operation. If verification is not performed, once the workpieces shift, not only will work hours be wasted, but the rejection rate of the product will also increase. Summary of the Invention

[0003] In view of the above situation, and to overcome the shortcomings of the prior art, the present invention proposes a welding device that can monitor the relative position of sheet metal workpieces before welding. In order to automatically verify the position of the workpiece before welding, the present invention is based on the principle that two points in a plane can determine a line segment. By providing magnetic attraction and pushing components at both ends of the beam, the hydraulic clutch mechanism can only be engaged after the magnetic attraction and pushing components at both ends are triggered by adsorption. This ensures that welding can only be carried out when the workpiece is in the correct position; otherwise, welding cannot be carried out.

[0004] However, since a certain pressure is required to push the liquid, the magnetic suction cup needs to have a certain size. Therefore, in order to avoid the problem that the corresponding magnetic suction cups are triggered to slide when they partially overlap and are not coaxial, the present invention proposes a magnetic unlocking component as a safety device for the magnetic pushing component. The sliding of the central sliding rod can only be triggered after the positions of the surrounding magnetic columns are corresponding, which can effectively solve the problem of mutual adsorption of the magnetic suction cups when they partially overlap.

[0005] In addition, since the edge of a sheet metal workpiece is not necessarily a straight line, the present invention also proposes a telescopic tracking assembly, which, through the guidance of the guide rod and the elastic force of the tracking spring, allows the end of the welding gun used for welding to always slide along the edge of a sheet metal workpiece, thereby achieving the technical effect of the welding gun sliding along the actual edge of the sheet metal workpiece when the slide slides along a straight line.

[0006] The technical solution adopted by the present invention is as follows: The present invention proposes an automatic welding device for automobile body parts, comprising a workpiece clamping assembly, a dual magnetic positioning mechanism, a hydraulic clutch mechanism, and a sliding welding mechanism, wherein the workpiece clamping assembly is provided with two groups, the dual magnetic positioning mechanism is symmetrically arranged at both ends of the workpiece clamping assembly, the hydraulic clutch mechanism is arranged at one end of the workpiece clamping assembly, and the sliding welding mechanism is arranged on the workpiece clamping assembly;

[0007] Furthermore, the dual magnetic positioning mechanism includes a magnetic pushing component and a magnetic unlocking component. The magnetic pushing component is arranged on the workpiece clamping component. The magnetic unlocking components are arranged in a ring shape in the magnetic pushing component. The workpiece clamping component includes a crossbeam.

[0008] The dual magnetic positioning mechanism has a dual positioning function. First, through the magnetic unlocking component, the two relative sets of magnetic pushing components can only be attracted and slide against each other when the coaxiality reaches a certain degree; in addition, the sliding of the magnetic pushing component can control the engagement and separation of the hydraulic clutch mechanism.

[0009] Preferably, the magnetic pushing assembly includes a positioning bracket, a positioning cylinder, a center slide rod and a liquid storage chamber. The positioning bracket is fixed to the two ends of the beam, and the positioning cylinder is arranged in the positioning bracket. The positioning cylinder is provided with a through center slide hole and an eccentric slide hole, and the top of the eccentric slide hole is provided with a slide groove. The center slide rod is snap-fitted and slidably arranged in the center slide hole. The center slide rod is sequentially provided with a magnetic suction cup, a locking cup and a piston cup, and the locking cup and the magnetic suction cup are slidably arranged in the center slide hole. The liquid storage chamber is arranged on the positioning cylinder, and the piston cup is snap-fitted and slidably arranged in the liquid storage chamber.

[0010] When the two magnetic cups are close to each other, the magnetic attraction between them causes them to slide toward each other, thereby squeezing out the liquid in the liquid storage chamber and realizing power transmission control of the hydraulic clutch mechanism.

[0011] As a further preferred embodiment of the present invention, the magnetic unlocking assembly includes a lock tongue, a steering column, a magnetic column and a limit ring. The lock tongue is engaged and slidably arranged in the slide groove, the steering column is fixed in the eccentric slide hole, a linkage rope is provided between the lock tongue and the magnetic column, the linkage rope passes around the steering column, the magnetic column is slidably arranged in the eccentric slide hole, the limit ring is fixed in the eccentric slide hole, and a reset spring is provided between the limit ring and the magnetic column.

[0012] The position of the center slide can be restricted by the lock tongue, and whether the center slide can be unlocked can be controlled by the magnetic columns distributed on the outside; compared with only setting up a magnetic push component, the positioning accuracy of the double magnetic positioning mechanism can be significantly improved, avoiding the problem of the hydraulic clutch mechanism being triggered to engage as soon as the two sets of center slides approach.

[0013] Furthermore, the hydraulic clutch mechanism includes a rotating assembly, an extrusion coupling assembly and a driving assembly, the rotating assembly is arranged in the driving assembly, the extrusion coupling assembly is arranged in the rotating assembly, and the driving assembly is arranged on the workpiece clamping assembly.

[0014] Preferably, the rotating assembly includes a coupling box, a coupling main shaft and a sliding coupling piece. The coupling box is arranged in the driving assembly. The coupling box and the liquid storage chambers at both ends are connected by pipes. The coupling main shaft is rotatably arranged in the coupling box. A cylindrical portion and a polygonal sliding portion are provided on the coupling main shaft. The sliding coupling piece is engaged and slidably arranged on the polygonal sliding portion, and a rotating connecting groove is provided on the sliding coupling piece.

[0015] As a further preferred embodiment of the present invention, the extrusion coupling assembly includes a fixed coupling plate, a clutch piston and a separation spring, the fixed coupling plate is fixedly connected to the sliding welding mechanism, the clutch piston is engaged and slidably arranged between the coupling box and the cylindrical part, the separation spring is arranged between the clutch piston and the coupling box, and the protrusion of the separation spring is rotatably connected to the rotating connection groove.

[0016] By controlling the engagement and separation of the fixed engaging piece and the sliding engaging piece, it is possible to control whether the driving component can drive the sliding welding mechanism; thereby achieving the technical purpose of starting the welding process only after the relative position adjustment of the sheet metal workpiece is completed; by designing the flow rate of the transmission fluid, the sliding engaging piece and the fixed engaging piece can be squeezed and combined only after the central sliding rods at both ends are fully adsorbed.

[0017] As a further preferred embodiment of the present invention, the drive assembly includes a motor base, a drive motor, a drive gear and a driven gear. The motor base is arranged on the crossbeam, the drive motor and the coupling box are clamped in the motor base, the drive gear is arranged on the output shaft of the drive motor, and the driven gear is arranged on the cylindrical part. The drive gear and the driven gear are engaged with each other for transmission.

[0018] Furthermore, the sliding welding mechanism includes a transverse sliding component and a telescopic tracking component, the transverse sliding component is arranged on the crossbeam, and the telescopic tracking component is arranged on the transverse sliding component.

[0019] Preferably, the workpiece clamping assembly further comprises a clamping bracket and an adsorption device, wherein the clamping bracket is arranged on the crossbeam, and the adsorption device is arranged on the crossbeam, and the sheet metal workpiece is fixed by the adsorption device.

[0020] Preferably, the lateral sliding assembly includes a screw support, a transmission screw, a nut, a slide, a guide rail and a slider. The screw support is arranged on the crossbeam, the transmission screw is rotatably arranged in the screw support, the fixed coupling plate is fixed to one end of the transmission screw, the nut and the transmission screw are threadedly transmitted, the nut is engaged in the slide, the guide rail is arranged on the crossbeam, the slider is engaged and slidably arranged on the guide rail, and the slider and the slide are fixed.

[0021] As a further preferred embodiment of the present invention, the telescopic tracking assembly includes a telescopic base, a telescopic sliding block, a tracking spring, an L-shaped plate and a welding gun, the telescopic base is arranged on the slide, the telescopic base is provided with a guide rod, the telescopic sliding block is engaged and slidably arranged on the guide rod, the tracking spring is arranged between the telescopic base and the telescopic sliding block, the L-shaped plate is arranged on the telescopic sliding block, the welding gun is arranged on the L-shaped plate, and the end of the welding gun slides along the edge of the sheet metal workpiece.

[0022] Under the elastic force of the tracking spring, the welding gun can always slide along the edge of the sheet metal workpiece. When facing the edge of a curved surface with large curvature, it can automatically perform tracking welding on the junction of two sheet metal workpieces without the need for advance programming.

[0023] The beneficial effects achieved by the present invention using the above structure are as follows:

[0024] (1) The dual magnetic positioning mechanism has a dual positioning function. First, the magnetic unlocking component can make the two relative magnetic push components adsorb and slide against each other only when the coaxiality reaches a certain degree; in addition, the sliding of the magnetic push component can control the engagement and separation of the hydraulic clutch mechanism.

[0025] (2) When the two magnetic cups are close to each other, the magnetic attraction between them causes them to slide toward each other, thereby squeezing out the liquid in the liquid storage chamber and realizing power transmission control of the hydraulic clutch mechanism.

[0026] (3) The position of the center slide can be restricted by the lock tongue, and the unlocking of the center slide can be controlled by the magnetic columns distributed on the outside; compared with only setting up a magnetic push component, the positioning accuracy of the double magnetic positioning mechanism can be significantly improved, avoiding the problem of the hydraulic clutch mechanism being triggered when the two sets of center slides are close to each other.

[0027] (4) By controlling the engagement and separation of the fixed engagement piece and the sliding engagement piece, it is possible to control whether the driving component can drive the sliding welding mechanism; thereby achieving the technical purpose of starting the welding process only after the relative position adjustment of the sheet metal workpiece is completed; by designing the flow rate of the transmission fluid, the sliding engagement piece and the fixed engagement piece can be squeezed and engaged only after the central sliding rods at both ends are completely adsorbed.

[0028] (5) Under the elastic force of the tracking spring, the welding gun can always slide along the edge of the sheet metal workpiece. When facing the edge of a curved surface with large curvature, the intersection of two sheet metal workpieces can be automatically tracked and welded without prior programming. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A three-dimensional diagram of an automatic welding device for automobile body parts proposed by the present invention;

[0030] Figure 2 This is a front view of an automatic welding device for automobile body parts proposed by the present invention;

[0031] Figure 3 A top view of an automatic welding device for automobile body parts proposed by the present invention;

[0032] Figure 4 for Figure 2 A cross-sectional view along the cutting line AA;

[0033] Figure 5 for Figure 4 A cross-sectional view along the cutting line BB;

[0034] Figure 6 for Figure 3 A cross-sectional view along the cutting line CC;

[0035] Figure 7 This is a schematic diagram of the exploded structure of an automatic welding device for automobile body parts proposed by the present invention;

[0036] Figure 8 for Figure 4 A partial enlarged view of point Ⅰ in the middle;

[0037] Figure 9 for Figure 5 A partial enlarged view of the middle II;

[0038] Figure 10 for Figure 6 A partial enlarged view of point III in the middle;

[0039] Figure 11 for Figure 7 A partial enlarged view of point IV in the middle.

[0040] Among them, 1. Workpiece clamping assembly, 2. Double magnetic positioning mechanism, 3. Hydraulic clutch mechanism, 4. Sliding welding mechanism, 5. Clamping bracket, 6. Beam, 7. Adsorption device, 8. Sheet metal workpiece, 9. Magnetic pushing assembly, 10. Magnetic unlocking assembly, 11. Positioning bracket, 12. Positioning cylinder, 13. Center slide rod, 14. Liquid storage chamber, 15. Lock tongue, 16. Steering column, 17. Magnetic column, 18. Limiting ring, 19. Center slide hole, 20. Eccentric slide hole, 21. Magnetic suction disc, 22. Locking disc, 23. Piston disc, 24. Linkage rope, 25. Reset spring, 26. Rotating assembly, 27. Extrusion combination assembly, 28. Drive Components, 29, coupling box, 30, coupling main shaft, 31, sliding coupling plate, 32, fixed coupling plate, 33, clutch piston, 34, separation spring, 35, motor base, 36, drive motor, 37, drive gear, 38, driven gear, 39, cylindrical part, 40, polygonal sliding part, 41, rotating connecting groove, 42, lateral sliding component, 43, telescopic tracking component, 44, screw support, 45, transmission screw, 46, nut, 47, slide plate, 48, guide rail, 49, slider, 50, telescopic base, 51, telescopic sliding block, 52, tracking spring, 53, L-shaped plate, 54, welding gun, 55, guide rod, 56, slide groove.

[0041] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0043] In the description of the present invention, it should be understood that terms such as "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0044] like Figures 1 to 11As shown, the present invention proposes an automatic welding device for automobile body parts, comprising a workpiece clamping assembly 1, a dual magnetic positioning mechanism 2, a hydraulic clutch mechanism 3, and a sliding welding mechanism 4, wherein the workpiece clamping assembly 1 is provided with two groups, the dual magnetic positioning mechanisms 2 are symmetrically arranged at both ends of the workpiece clamping assembly 1, the hydraulic clutch mechanism 3 is arranged at one end of the workpiece clamping assembly 1, and the sliding welding mechanism 4 is arranged on the workpiece clamping assembly 1;

[0045] The workpiece clamping assembly 1 further includes a clamping bracket 5 and an adsorption device 7 . The clamping bracket 5 is arranged on the crossbeam 6 . The adsorption device 7 is arranged on the crossbeam 6 . The sheet metal workpiece 8 is fixed by the adsorption device 7 .

[0046] The sliding welding mechanism 4 includes a transverse sliding component 42 and a telescopic tracking component 43 . The transverse sliding component 42 is arranged on the crossbeam 6 , and the telescopic tracking component 43 is arranged on the transverse sliding component 42 .

[0047] The lateral sliding assembly 42 includes a screw support 44, a transmission screw 45, a nut 46, a slide 47, a guide rail 48 and a slider 49. The screw support 44 is arranged on the crossbeam 6, and the transmission screw 45 is rotatably arranged in the screw support 44. The fixed coupling piece 32 is fixed to one end of the transmission screw 45. The nut 46 and the transmission screw 45 are threadedly transmitted. The nut 46 is engaged in the slide 47, the guide rail 48 is arranged on the crossbeam 6, and the slider 49 is engaged and slidably arranged on the guide rail 48. The slider 49 and the slide 47 are fixed.

[0048] The telescopic tracking assembly 43 includes a telescopic base 50, a telescopic sliding block 51, a tracking spring 52, an L-shaped plate 53 and a welding gun 54. The telescopic base 50 is arranged on the slide 47. The telescopic base 50 is provided with a guide rod 55. The telescopic sliding block 51 is engaged and slidably arranged on the guide rod 55. The tracking spring 52 is arranged between the telescopic base 50 and the telescopic sliding block 51. The L-shaped plate 53 is arranged on the telescopic sliding block 51. The welding gun 54 is arranged on the L-shaped plate 53. The end of the welding gun 54 slides along the edge of the sheet metal workpiece 8.

[0049] Under the elastic force of the tracking spring 52, the welding gun 54 can always slide along the edge of the sheet metal workpiece 8. When facing the edge of a curved surface with large curvature, tracking welding can be automatically performed on the junction of the two sheet metal workpieces 8 without advance programming.

[0050] The double magnetic positioning mechanism 2 includes a magnetic pushing component 9 and a magnetic unlocking component 10. The magnetic pushing component 9 is arranged on the workpiece clamping component 1, and the magnetic unlocking component 10 is arranged in a ring shape in the magnetic pushing component 9. The workpiece clamping component 1 includes a crossbeam 6.

[0051] The dual magnetic positioning mechanism 2 has a dual positioning function. First, through the magnetic unlocking component 10, the two relative sets of magnetic pushing components 9 will only be attracted and slide against each other when the coaxiality reaches a certain degree; in addition, the sliding of the magnetic pushing component 9 can control the engagement and separation of the hydraulic clutch mechanism 3.

[0052] The magnetic pushing assembly 9 includes a positioning bracket 11, a positioning cylinder 12, a center slide rod 13 and a liquid storage chamber 14. The positioning bracket 11 is fixed to both ends of the beam 6. The positioning cylinder 12 is arranged in the positioning bracket 11. The positioning cylinder 12 is provided with a through center slide hole 19 and an eccentric slide hole 20. The top of the eccentric slide hole 20 is provided with a slide groove 56. The center slide rod 13 is engaged and slidably arranged in the center slide hole 19. The center slide rod 13 is provided with a magnetic suction cup 21, a locking cup 22 and a piston cup 23 in sequence. The locking cup 22 and the magnetic suction cup 21 are slidably arranged in the center slide hole 19. The liquid storage chamber 14 is arranged on the positioning cylinder 12, and the piston cup 23 is engaged and slidably arranged in the liquid storage chamber 14.

[0053] When the two magnetic chucks 21 are brought close to each other, the magnetic attraction between them causes them to slide toward each other, thereby squeezing out the liquid in the liquid storage chamber 14 and achieving power transmission control of the hydraulic clutch mechanism 3 .

[0054] The magnetic unlocking assembly 10 includes a lock tongue 15, a steering column 16, a magnetic column 17 and a limit ring 18. The lock tongue 15 is engaged and slidably arranged in the slide groove 56. The steering column 16 is fixed in the eccentric slide hole 20. A linkage rope 24 is provided between the lock tongue 15 and the magnetic column 17. The linkage rope 24 passes around the steering column 16. The magnetic column 17 is slidably arranged in the eccentric slide hole 20. The limit ring 18 is fixed in the eccentric slide hole 20. A reset spring 25 is provided between the limit ring 18 and the magnetic column 17.

[0055] The position of the center slide rod 13 can be restricted by the lock tongue 15, and whether the center slide rod 13 is unlocked can be controlled by the magnetic columns 17 distributed on the outside; compared with only setting the magnetic push component 9, the positioning accuracy of the dual magnetic positioning mechanism 2 can be significantly improved, avoiding the problem of the hydraulic clutch mechanism 3 being triggered to engage as soon as the two groups of center slide rods 13 approach each other.

[0056] The hydraulic clutch mechanism 3 includes a rotating assembly 26 , an extrusion assembly 27 and a driving assembly 28 . The rotating assembly 26 is arranged in the driving assembly 28 , the extrusion assembly 27 is arranged in the rotating assembly 26 , and the driving assembly 28 is arranged on the workpiece clamping assembly 1 .

[0057] The rotating assembly 26 includes a coupling box 29, a coupling main shaft 30 and a sliding coupling piece 31. The coupling box 29 is arranged in the driving assembly 28. The coupling box 29 and the liquid storage chambers 14 at both ends are connected by pipes. The coupling main shaft 30 is rotatably arranged in the coupling box 29. The coupling main shaft 30 is provided with a cylindrical portion 39 and a polygonal sliding portion 40. The sliding coupling piece 31 is engaged and slidably arranged on the polygonal sliding portion 40. The sliding coupling piece 31 is provided with a rotating connecting groove 41.

[0058] The extrusion coupling assembly 27 includes a fixed coupling plate 32, a clutch piston 33 and a separation spring 34. The fixed coupling plate 32 is fixedly connected to the sliding welding mechanism 4. The clutch piston 33 is engaged and slidably arranged between the coupling box 29 and the cylindrical portion 39. The separation spring 34 is arranged between the clutch piston 33 and the coupling box 29. The protrusion of the separation spring 34 is rotatably connected to the rotating connection groove 41.

[0059] By controlling the engagement and separation of the fixed engaging piece 32 and the sliding engaging piece 31, it is possible to control whether the driving component 28 can drive the sliding welding mechanism 4; thereby achieving the technical purpose of starting the welding process only after the relative position adjustment of the sheet metal workpiece 8 is completed; by designing the flow rate of the transmission fluid, the sliding engaging piece 31 and the fixed engaging piece 32 can be squeezed and combined only after the central sliding rods 13 at both ends are completely adsorbed.

[0060] The driving assembly 28 includes a motor base 35, a driving motor 36, a driving gear 37 and a driven gear 38. The motor base 35 is arranged on the crossbeam 6. The driving motor 36 and the coupling box 29 are engaged and arranged in the motor base 35. The driving gear 37 is arranged on the output shaft of the driving motor 36. The driven gear 38 is arranged on the cylindrical part 39. The driving gear 37 and the driven gear 38 are engaged and transmitted.

[0061] When in use, the user first needs to clamp and fix the clamping bracket 5. The adsorption device 7 can choose a suction cup or magnetic attraction scheme, and select a welding gun 54 with a safety protection function. This type of welding gun 54 can only weld when it slides relative to the workpiece, and cannot weld when it does not move relative to the workpiece; then adjust the position of the device and the sheet metal workpiece 8. After the relative position of the two sheet metal workpieces 8 is adjusted, welding can be carried out. During the adjustment process, the dual magnetic positioning mechanism 2 can provide feedback on whether the relative position of the two sheet metal workpieces 8 is in place. The process is as follows:

[0062] After the two sheet metal workpieces 8 are fitted together, it is only necessary to adjust the position within the plane. Since the two points can determine the position within the plane, when the relative magnetic suction cups 21 overlap, the mutual attraction between the two can cause the piston disc 23 to slide, thereby pushing the liquid in the liquid storage chamber 14 into the coupling box 29. However, since a certain pressure is required to push the liquid, the magnetic suction cups 21 need to be of a certain size. Therefore, in order to avoid the relative magnetic suction cups 21 partially overlapping and triggering sliding before being coaxial, the magnetic pushing component 9 needs to be locked by the magnetic unlocking component 10.

[0063] Since the magnetic column 17 only needs to drive the lock tongue 15 to slide, the diameter of the magnetic column 17 can be very small, and the positioning accuracy will naturally be higher. When all the surrounding magnetic columns 17 are aligned and adsorbed, the magnetic column 17 pulls the lock tongue 15 through the linkage rope 24, thereby unlocking the locking disk 22. At this time, the center slide rod 13 will slide in the center slide hole 19.

[0064] After the liquid enters the coupling box 29 from the liquid storage chamber 14, it pushes the clutch piston 33 to cause the sliding coupling piece 31 to slide toward the fixed coupling piece 32. Due to the design of the liquid flow rate, when only the liquid storage chamber 14 at one end supplies liquid toward the coupling box 29, it is insufficient to press the sliding coupling piece 31 and the fixed coupling piece 32 together. Only when the liquid storage chambers 14 at both ends supply liquid toward the coupling box 29 will the sliding coupling piece 31 and the fixed coupling piece 32 contact and be squeezed.

[0065] Before the fixed coupling piece 32 and the sliding coupling piece 31 are coupled, even if the drive motor 36 is started, the transmission screw 45 will not be driven to rotate. After the fixed coupling piece 32 and the sliding coupling piece 31 are coupled, the drive motor 36 is started, and the transmission screw 45 will follow the rotation. Through the transmission of the transmission screw 45 and the nut 46 and the guidance of the guide rail 48 and the slider 49, the rotation of the transmission screw 45 can carry the slide 47 and the telescopic tracking assembly 43 to slide along the intersection of the two sheet metal workpieces 8.

[0066] If the intersection line of the two sheet metal workpieces 8 is not a straight line but a gentle curve, the end of the welding gun 54 used for welding can always slide along the edge of a sheet metal workpiece 8 under the guidance of the guide rod 55 and the elastic force of the tracking spring 52, thereby achieving the technical effect of the welding gun 54 sliding along the actual edge of the sheet metal workpiece 8 when the slide plate 47 slides along the straight line.

[0067] After welding is completed, the welded sheet metal workpiece 8 only needs to be removed by the robot arm of the next process, and the double magnetic positioning mechanism 2 can be separated by moving the workpiece clamping assembly 1 away. At this time, the magnetic column 17 will be reset under the elastic force of the reset spring 25, and the lock tongue 15 can be reset by the linkage rope 24, or the reset spring 25 can be set at the end of the lock tongue 15 and the slide groove 56 to reset the lock tongue 15 and the magnetic column 17 at the same time; then the sliding coupling plate 31 and the clutch piston 33 will move away from the fixed coupling plate 32 under the elastic force of the separation spring 34, and at the same time the clutch piston 33 pushes the liquid in the coupling box 29 back into the two liquid storage chambers 14, and at the same time the center slide rod 13 is reset.

[0068] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0069] The present invention and its embodiments are described above. This description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by this and, without departing from the purpose of the present invention, designs structures and embodiments similar to this technical solution without inventiveness, they shall fall within the scope of protection of the present invention.

Claims

1. An automatic welding device for automobile body parts, characterized in that: The invention comprises a workpiece clamping assembly (1), a dual magnetic positioning mechanism (2), a hydraulic clutch mechanism (3) and a sliding welding mechanism (4), wherein the workpiece clamping assembly (1) is provided with two groups, the dual magnetic positioning mechanism (2) is symmetrically arranged at both ends of the workpiece clamping assembly (1), the hydraulic clutch mechanism (3) is arranged at one end of the workpiece clamping assembly (1), and the sliding welding mechanism (4) is arranged on the workpiece clamping assembly (1); The dual magnetic positioning mechanism (2) includes a magnetic pushing component (9) and a magnetic unlocking component (10), wherein the magnetic pushing component (9) is arranged on the workpiece clamping component (1), and the magnetic unlocking component (10) is arranged in a ring shape in the magnetic pushing component (9); the hydraulic clutch mechanism (3) includes a rotating component (26), an extrusion combining component (27) and a driving component (28), wherein the rotating component (26) is arranged in the driving component (28), the extrusion combining component (27) is arranged in the rotating component (26), and the driving component (28) is arranged on the workpiece clamping component (1); The workpiece clamping assembly (1) includes a crossbeam (6), and the magnetic attraction pushing assembly (9) includes a positioning bracket (11), a positioning cylinder (12), a central slide rod (13) and a liquid storage chamber (14). The positioning bracket (11) is fixed to both ends of the crossbeam (6), and the positioning cylinder (12) is arranged in the positioning bracket (11). The positioning cylinder (12) is provided with a through central slide hole (19) and an eccentric slide hole (20). The eccentric slide hole (20 ) is provided with a slide groove (56) on the top, the central slide rod (13) is engaged and slidably arranged in the central slide hole (19), the central slide rod (13) is provided with a magnetic suction cup (21), a locking disc (22) and a piston disc (23) in sequence, the locking disc (22) and the magnetic suction cup (21) are slidably arranged in the central slide hole (19), the liquid storage chamber (14) is provided on the positioning cylinder (12), and the piston disc (23) is engaged and slidably arranged in the liquid storage chamber (14); The magnetic unlocking assembly (10) includes a lock tongue (15), a steering column (16), a magnetic column (17) and a limit ring (18), wherein the lock tongue (15) is engaged and slidably arranged in the slide groove (56), the steering column (16) is fixed in the eccentric slide hole (20), a linkage rope (24) is provided between the lock tongue (15) and the magnetic column (17), the linkage rope (24) passes around the steering column (16), the magnetic column (17) is slidably arranged in the eccentric slide hole (20), the limit ring (18) is fixed in the eccentric slide hole (20), and a reset spring (25) is provided between the limit ring (18) and the magnetic column (17); The rotating assembly (26) includes a coupling box (29), a coupling main shaft (30) and a sliding coupling piece (31). The coupling box (29) is arranged in the driving assembly (28). The coupling box (29) and the liquid storage chambers (14) at both ends are connected by pipelines. The coupling main shaft (30) is rotatably arranged in the coupling box (29). The coupling main shaft (30) is provided with a cylindrical portion (39) and a polygonal sliding portion (40). The sliding coupling piece (31) is engaged and slidably arranged on the polygonal sliding portion (40). The sliding coupling piece (31) is provided with a rotating connection groove (41).

2. The automatic welding device for automobile body parts according to claim 1, characterized in that: The extrusion coupling assembly (27) includes a fixed coupling piece (32), a clutch piston (33) and a separation spring (34); the fixed coupling piece (32) is fixedly connected to the sliding welding mechanism (4); the clutch piston (33) is engaged and slidably arranged between the coupling box (29) and the cylindrical portion (39); the separation spring (34) is arranged between the clutch piston (33) and the coupling box (29); and the protrusion of the separation spring (34) is rotationally connected to the rotation connection groove (41).

3. The automatic welding device for automobile body parts according to claim 2, characterized in that: The driving assembly (28) includes a motor base (35), a driving motor (36), a driving gear (37) and a driven gear (38), wherein the motor base (35) is arranged on the crossbeam (6), the driving motor (36) and the coupling box (29) are engaged and arranged in the motor base (35), the driving gear (37) is arranged on the output shaft of the driving motor (36), the driven gear (38) is arranged on the cylindrical portion (39), and the driving gear (37) and the driven gear (38) are meshed and transmitted.

4. The automatic welding device for automobile body parts according to claim 3, characterized in that: The sliding welding mechanism (4) comprises a transverse sliding component (42) and a telescopic tracking component (43), wherein the transverse sliding component (42) is arranged on the crossbeam (6), and the telescopic tracking component (43) is arranged on the transverse sliding component (42).

5. The automatic welding device for automobile body parts according to claim 1, characterized in that: The workpiece clamping assembly (1) further comprises a clamping bracket (5) and an adsorption device (7), wherein the clamping bracket (5) is arranged on the crossbeam (6), and the adsorption device (7) is arranged on the crossbeam (6), and the sheet metal workpiece (8) is fixed by the adsorption device (7).

6. The automatic welding device for automobile body parts according to claim 4, characterized in that: The lateral sliding assembly (42) includes a screw support (44), a transmission screw (45), a nut (46), a slide (47), a guide rail (48) and a slider (49), wherein the screw support (44) is arranged on the crossbeam (6), the transmission screw (45) is rotatably arranged in the screw support (44), the fixed coupling piece (32) is fixed to one end of the transmission screw (45), the nut (46) and the transmission screw (45) are threadedly transmitted, the nut (46) is engaged in the slide (47), the guide rail (48) is arranged on the crossbeam (6), the slider (49) is engaged and slidably arranged on the guide rail (48), and the slider (49) and the slide (47) are fixedly connected.

7. The automatic welding device for automobile body parts according to claim 6, characterized in that: The telescopic tracking assembly (43) includes a telescopic base (50), a telescopic sliding block (51), a tracking spring (52), an L-shaped plate (53) and a welding gun (54), wherein the telescopic base (50) is arranged on the slide (47), a guide rod (55) is provided on the telescopic base (50), the telescopic sliding block (51) is engaged and slidably arranged on the guide rod (55), the tracking spring (52) is arranged between the telescopic base (50) and the telescopic sliding block (51), the L-shaped plate (53) is arranged on the telescopic sliding block (51), the welding gun (54) is arranged on the L-shaped plate (53), and the end of the welding gun (54) slides along the edge of the sheet metal workpiece (8).

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