Automatic welding device for automobile body parts

Abstract

The invention belongs to the technical field of automobile body part welding, and particularly discloses an automatic welding device for automobile body parts, which comprises two groups of workpiece clamping assemblies, a double magnetic attraction positioning mechanism, a hydraulic clutch mechanism and a sliding welding mechanism, the double magnetic attraction positioning mechanisms are symmetrically arranged at the two 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. On the basis of the principle that two points in a plane can determine a line segment, combination of the hydraulic clutch mechanism can be achieved only after the magnetic attraction pushing assemblies at the two ends are attracted and triggered; and a magnetic attraction unlocking assembly is provided, sliding of a center sliding rod can be triggered only after the positions of magnetic attraction columns on the periphery correspond, and the problem that magnetic attraction cups attract each other when partially coincident can be effectively solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of body part welding, and specifically refers to an automatic welding device for automobile body parts. Background Art

[0002] An automobile body is welded by multiple independent stamping parts. Therefore, the welded positions are mostly the overlapping positions of flat stamping parts. Then, welding is carried out along the contact seam between the two parts, which can be spot welding or laser welding. Before welding, the two workpieces need to be clamped and fixed. Although the relative positions of the workpieces are accurate in most cases, it is still necessary to verify them by measurement. However, this increases the operation steps during actual operation; if verification is not carried out, once the workpiece is offset, not only will the working hours be wasted, but also the unqualified rate of the product will increase. Summary of the Invention

[0003] In view of the above situation, to overcome the defects 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, based on the principle that two points in a plane can determine a line segment, by setting magnetic adsorption and pushing components at both ends of the cross beam, the hydraulic clutch mechanism can be combined only after both magnetic adsorption and pushing components at both ends are adsorbed and triggered; thus ensuring that welding can be carried out only when the workpiece position is correct, otherwise welding cannot be carried out; However, since the pushing liquid needs to have a certain pressure, the magnetic chuck needs to have a certain size. Therefore, in order to avoid the problem that the corresponding magnetic chucks trigger sliding when they partially overlap and are not yet coaxial, the present invention further proposes a magnetic adsorption unlocking component as an insurance device for the magnetic adsorption and pushing component. Only after the surrounding magnetic adsorption columns are in corresponding positions can the sliding of the central sliding rod be triggered, which can effectively solve the problem that the magnetic chucks are adsorbed to each other when they partially overlap.

[0004] In addition, since the edge of the sheet metal workpiece is not necessarily a straight line, the present invention also proposes a telescopic tracking component. Through the guiding of the guiding rod and the elastic force of the tracking spring, the end of the welding torch for welding can always slide along the edge line of a sheet metal workpiece, so that when the sliding plate slides along a straight line, the technical effect that the welding torch slides along the actual edge of the sheet metal workpiece is achieved.

[0005] The technical solution adopted by the present invention is as follows: The present invention proposes an automatic welding device for automobile body parts, including a workpiece clamping component, a dual magnetic adsorption positioning mechanism, a hydraulic clutch mechanism, and a sliding welding mechanism. There are two groups of workpiece clamping components, the dual magnetic adsorption positioning mechanism is symmetrically arranged at both ends of the workpiece clamping component, the hydraulic clutch mechanism is arranged at one end of the workpiece clamping component, and the sliding welding mechanism is arranged on the workpiece clamping component; Furthermore, the dual magnetic attraction positioning mechanism includes a magnetic attraction pushing component and a magnetic attraction unlocking component. The magnetic attraction pushing component is arranged on the workpiece clamping component, and the magnetic attraction unlocking components are annularly and evenly arranged in the magnetic attraction pushing component. The workpiece clamping component includes a cross beam.

[0006] The dual magnetic attraction positioning mechanism has the function of dual positioning. First, through the magnetic attraction unlocking component, only when the coaxiality of two opposite magnetic attraction pushing components reaches a certain degree can they adsorb and slide relative to each other; in addition, through the sliding of the magnetic attraction pushing component, the engagement and separation of the hydraulic clutch mechanism can be controlled.

[0007] Preferably, the magnetic attraction pushing component includes a positioning bracket, a positioning cylinder, a central slide rod, and a liquid storage cavity. The positioning brackets are fixedly connected to both ends of the cross beam. The positioning cylinder is arranged in the positioning bracket. The positioning cylinder is provided with a through central slide hole and an eccentric slide hole. The top of the eccentric slide hole is provided with a chute. The central slide rod is clamped and slidably arranged in the central slide hole. A magnetic suction disc, a locking disc, and a piston disc are sequentially arranged on the central slide rod. The locking disc and the magnetic suction disc are slidably arranged in the central slide hole. The liquid storage cavity is arranged on the positioning cylinder. The piston disc is clamped and slidably arranged in the liquid storage cavity.

[0008] When the two magnetic suction discs approach each other, the magnetic attraction force between them will cause them to slide towards each other, thereby squeezing out the liquid in the liquid storage cavity and realizing the control of the power transmission of the hydraulic clutch mechanism.

[0009] As a further preference of the present invention, the magnetic attraction unlocking component includes a locking tongue, a steering column, a magnetic attraction column, and a limit retaining ring. The locking tongue is clamped and slidably arranged in the chute. The steering column is fixedly connected to the eccentric slide hole. A linkage rope is arranged between the locking tongue and the magnetic attraction column, and the linkage rope bypasses the steering column. The magnetic attraction column is slidably arranged in the eccentric slide hole. The limit retaining ring is fixedly connected to the eccentric slide hole, and a return tension spring is arranged between the limit retaining ring and the magnetic attraction column.

[0010] The position of the central slide rod can be restricted by the locking tongue, and the unlocking of the central slide rod can be controlled by the magnetic attraction columns distributed on the outside; compared with only setting the magnetic attraction pushing component, the positioning accuracy of the dual magnetic attraction positioning mechanism can be significantly improved, and the problem that the hydraulic clutch mechanism is engaged as soon as the two central slide rods approach can be avoided.

[0011] Furthermore, the hydraulic clutch mechanism includes a rotating component, a squeezing and engaging component, and a driving component. The rotating component is arranged in the driving component. The squeezing and engaging component is arranged in the rotating component. The driving component is arranged on the workpiece clamping component.

[0012] Preferably, the rotation assembly includes a combination box, a combination main shaft, and a sliding combination piece. The combination box is arranged in the driving assembly, and the combination box is connected to the liquid storage cavities at both ends through pipelines. The combination main shaft is rotatably arranged in the combination box. A cylindrical portion and a polygonal sliding portion are arranged on the combination main shaft. The sliding combination piece is snap-fitted and slidably arranged on the polygonal sliding portion, and a rotation connection groove is arranged on the sliding combination piece.

[0013] As a further preference of the present invention, the extrusion combination assembly includes a fixed combination piece, a clutch piston, and a separation spring. The fixed combination piece is fixedly connected to the sliding welding mechanism. The clutch piston is snap-fitted and slidably arranged between the combination box and the cylindrical portion. The separation spring is arranged between the clutch piston and the combination box, and the protruding portion of the separation spring is rotatably connected to the rotation connection groove.

[0014] By controlling the combination and separation of the fixed combination piece and the sliding combination piece, it is possible to control whether the driving assembly 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. Through the flow design of the transmission fluid, the sliding combination piece and the fixed combination piece can be squeezed and combined only after the central sliding rods at both ends are all adsorbed.

[0015] As a further preference of the present invention, the driving assembly includes a motor base, a driving motor, a driving gear, and a driven gear. The motor base is arranged on the cross beam. The driving motor and the combination box are snap-fitted in the motor base. The driving gear is arranged on the output shaft of the driving motor. The driven gear is arranged on the cylindrical portion, and the driving gear and the driven gear are meshed and driven.

[0016] Furthermore, the sliding welding mechanism includes a lateral sliding assembly and a telescopic tracking assembly. The lateral sliding assembly is arranged on the cross beam, and the telescopic tracking assembly is arranged on the lateral sliding assembly.

[0017] Preferably, the workpiece clamping assembly further includes a clamping bracket and an adsorption device. The clamping bracket is arranged on the cross beam, and the adsorption device is arranged on the cross beam. The sheet metal workpiece is fixed through the adsorption device.

[0018] Preferably, the lateral sliding assembly includes a lead screw support, a transmission lead screw, a nut, a sliding plate, a guide rail, and a slider. The lead screw support is arranged on the cross beam. The transmission lead screw is rotatably arranged in the lead screw support. The fixed combination piece is fixedly connected to one end of the transmission lead screw. The nut is in threaded transmission with the transmission lead screw. The nut is snap-fitted in the sliding plate. The guide rail is arranged on the cross beam. The slider is snap-fitted and slidably arranged on the guide rail, and the slider is fixedly connected to the sliding plate.

[0019] As a further preference 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 torch. The telescopic base is arranged on the sliding plate. A guiding rod is arranged on the telescopic base. The telescopic sliding block is engaged and slidably arranged on the guiding 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 torch is arranged on the L-shaped plate, and the end of the welding torch slides along the edge of the sheet metal workpiece.

[0020] Under the elastic force of the tracking spring, the welding torch can always slide along the edge of the sheet metal workpiece. When facing the zero of the curved surface edge with large curvature, the tracking welding of the joint of two sheet metal workpieces can be automatically carried out without prior programming.

[0021] The beneficial effects achieved by the present invention with the above structure are as follows: (1) The dual magnetic attraction positioning mechanism has the function of dual positioning. First, through the magnetic attraction unlocking component, only when the coaxiality of two opposite magnetic attraction pushing components reaches a certain degree will they adsorb and slide relative to each other; in addition, the sliding of the magnetic attraction pushing component can control the engagement and separation of the hydraulic clutch mechanism.

[0022] (2) When the two magnetic chucks approach each other, the magnetic attraction force between them will cause them to slide towards each other, thereby squeezing out the liquid in the liquid storage cavity and realizing the control of the power transmission of the hydraulic clutch mechanism.

[0023] (3) The position of the central sliding rod can be restricted by the locking tongue, and the unlocking or not of the central sliding rod can be controlled by the magnetic attraction columns distributed on the outside; compared with only setting the magnetic attraction pushing component, the positioning accuracy of the dual magnetic attraction positioning mechanism can be significantly improved, and the problem that the hydraulic clutch mechanism is engaged as soon as the two central sliding rods approach can be avoided.

[0024] (4) By controlling the engagement and separation of the fixed engagement piece and the sliding engagement piece, it can be controlled whether the driving component can drive the sliding welding mechanism; thus, the technical purpose of starting the welding process only after the relative position adjustment of the sheet metal workpiece is completed can be achieved; through the design of 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 all adsorbed.

[0025] (5) Under the elastic force of the tracking spring, the welding torch can always slide along the edge of the sheet metal workpiece. When facing the zero of the curved surface edge with large curvature, the tracking welding of the joint of two sheet metal workpieces can be automatically carried out without prior programming. Description of the Drawings

[0026] Figure 1 It is a three-dimensional view of an automatic welding device for automobile body parts proposed by the present invention; Figure 2Front view of an automatic welding device for automotive body parts proposed by the present invention; Figure 3 Top view of an automatic welding device for automotive body parts proposed by the present invention; Figure 4 For Figure 2 Cross-sectional view along cutting line A-A in Figure 5 For Figure 4 Cross-sectional view along cutting line B-B in Figure 6 For Figure 3 Cross-sectional view along cutting line C-C in Figure 7 Exploded structural schematic diagram of an automatic welding device for automotive body parts proposed by the present invention; Figure 8 For Figure 4 Partial enlarged view of part Ⅰ in Figure 9 For Figure 5 Partial enlarged view of part Ⅱ in Figure 10 For Figure 6 Partial enlarged view of part Ⅲ in Figure 11 For Figure 7 Partial enlarged view of part Ⅳ in

[0027] Among them, 1. Workpiece clamping assembly, 2. Double magnetic attraction positioning mechanism, 3. Hydraulic clutch mechanism, 4. Sliding welding mechanism, 5. Clamping bracket, 6. Cross beam, 7. Adsorption device, 8. Sheet metal workpiece, 9. Magnetic attraction pushing component, 10. Magnetic attraction unlocking component, 11. Positioning bracket, 12. Positioning cylinder, 13. Central slide bar, 14. Liquid storage cavity, 15. Lock tongue, 16. Steering column, 17. Magnetic attraction column, 18. Limit retaining ring, 19. Central slide hole, 20. Eccentric slide hole, 21. Magnetic chuck, 22. Locking disc, 23. Piston disc, 24. Linking rope, 25. Return tension spring, 26. Rotating component, 27. Extrusion combination component, 28. Driving component, 29. Combination box, 30. Combination main shaft, 31. Sliding combination piece, 32. Fixed combination piece, 33. Clutch piston, 34. Separation spring, 35. Motor base, 36. Driving motor, 37. Driving gear, 38. Driven gear, 39. Cylindrical part, 40. Polygonal sliding part, 41. Rotating connection groove, 42. Transverse sliding component, 43. Telescopic tracking component, 44. Screw rod support, 45. Transmission screw rod, 46. Nut, 47. Slide plate, 48. Guide rail, 49. Slide block, 50. Telescopic base, 51. Telescopic sliding block, 52. Tracking spring, 53. L-shaped plate, 54. Welding torch, 55. Guide rod, 56. Chute.

[0028] The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention, and do not constitute a limitation to the present invention. Detailed Embodiments

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0030] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0031] As Figures 1 to 11 shown, the present invention provides an automatic welding device for automobile body parts, including a workpiece clamping assembly 1, a double magnetic adsorption positioning mechanism 2, a hydraulic clutch mechanism 3, and a sliding welding mechanism 4. Among them, there are two groups of workpiece clamping assemblies 1, the double magnetic adsorption 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 workpiece clamping assembly 1 further includes a clamping bracket 5 and an adsorption device 7. The clamping bracket 5 is arranged on the cross beam 6, the adsorption device 7 is arranged on the cross beam 6, and the sheet metal workpiece 8 is fixed by the adsorption device 7.

[0032] The sliding welding mechanism 4 includes a transverse sliding assembly 42 and a telescopic tracking assembly 43. The transverse sliding assembly 42 is arranged on the cross beam 6, and the telescopic tracking assembly 43 is arranged on the transverse sliding assembly 42.

[0033] The transverse sliding assembly 42 includes a lead screw support 44, a transmission lead screw 45, a nut 46, a slide plate 47, a guide rail 48, and a slider 49. The lead screw support 44 is arranged on the cross beam 6, the transmission lead screw 45 is rotatably arranged in the lead screw support 44, a fixed coupling piece 32 is fixedly connected to one end of the transmission lead screw 45, the nut 46 and the transmission lead screw 45 are in threaded transmission, the nut 46 is clamped in the slide plate 47, the guide rail 48 is arranged on the cross beam 6, the slider 49 is clamped and slidably arranged on the guide rail 48, and the slider 49 and the slide plate 47 are fixedly connected.

[0034] The telescopic tracking component 43 includes a telescopic base 50, a telescopic sliding block 51, a tracking spring 52, an L-shaped plate 53 and a welding torch 54. The telescopic base 50 is arranged on the sliding plate 47. A guide rod 55 is arranged 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 torch 54 is arranged on the L-shaped plate 53. The end of the welding torch 54 slides along the edge of the sheet metal workpiece 8.

[0035] Under the elastic force of the tracking spring 52, the welding torch 54 can always slide along the edge of the sheet metal workpiece 8. When facing the zero of the edge of a curved surface with a large curvature, the intersection of two sheet metal workpieces 8 can be automatically tracked and welded without prior programming.

[0036] The dual magnetic attraction positioning mechanism 2 includes a magnetic attraction pushing component 9 and a magnetic attraction unlocking component 10. The magnetic attraction pushing component 9 is arranged on the workpiece clamping component 1. The magnetic attraction unlocking component 10 is annularly and evenly arranged in the magnetic attraction pushing component 9. The workpiece clamping component 1 includes a cross beam 6.

[0037] The dual magnetic attraction positioning mechanism 2 has the function of dual positioning. First, through the magnetic attraction unlocking component 10, only when the coaxiality of two opposite magnetic attraction pushing components 9 reaches a certain degree can they adsorb and slide relative to each other; in addition, the sliding of the magnetic attraction pushing component 9 can control the engagement and separation of the hydraulic clutch mechanism 3.

[0038] The magnetic attraction pushing component 9 includes a positioning bracket 11, a positioning cylinder 12, a central sliding rod 13 and a liquid storage cavity 14. The positioning brackets 11 are fixedly connected to both ends of the cross beam 6. The positioning cylinder 12 is arranged in the positioning bracket 11. A through central sliding hole 19 and an eccentric sliding hole 20 are arranged on the positioning cylinder 12. A sliding groove 56 is arranged at the top of the eccentric sliding hole 20. The central sliding rod 13 is engaged and slidably arranged in the central sliding hole 19. A magnetic suction disc 21, a locking disc 22 and a piston disc 23 are sequentially arranged on the central sliding rod 13. The locking disc 22 and the magnetic suction disc 21 are slidably arranged in the central sliding hole 19. The liquid storage cavity 14 is arranged on the positioning cylinder 12. The piston disc 23 is engaged and slidably arranged in the liquid storage cavity 14.

[0039] When the two magnetic suction discs 21 approach each other, the magnetic attraction force between them will cause them to slide towards each other, thereby squeezing out the liquid in the liquid storage cavity 14 and realizing the control of the power transmission of the hydraulic clutch mechanism 3.

[0040] The magnetic attraction unlocking assembly 10 includes a lock tongue 15, a steering column 16, a magnetic attraction column 17, and a limit retaining ring 18. The lock tongue 15 is engaged and slidably disposed in the chute 56. The steering column 16 is fixedly connected to the eccentric sliding hole 20. A linkage rope 24 is provided between the lock tongue 15 and the magnetic attraction column 17. The linkage rope 24 bypasses the steering column 16. The magnetic attraction column 17 is slidably disposed in the eccentric sliding hole 20. The limit retaining ring 18 is fixedly connected to the eccentric sliding hole 20. A return tension spring 25 is provided between the limit retaining ring 18 and the magnetic attraction column 17.

[0041] The position of the central sliding rod 13 can be restricted by the lock tongue 15, and whether the central sliding rod 13 is unlocked can be controlled by the magnetic attraction columns 17 distributed on the outside. Compared with only setting the magnetic attraction pushing assembly 9, the positioning accuracy of the double magnetic attraction positioning mechanism 2 can be significantly improved, and the problem that the hydraulic clutch mechanism 3 is triggered to engage as soon as the two groups of central sliding rods 13 approach each other can be avoided.

[0042] The hydraulic clutch mechanism 3 includes a rotating assembly 26, a squeezing and engaging assembly 27, and a driving assembly 28. The rotating assembly 26 is disposed in the driving assembly 28. The squeezing and engaging assembly 27 is disposed in the rotating assembly 26. The driving assembly 28 is disposed on the workpiece clamping assembly 1.

[0043] The rotating assembly 26 includes a combining box 29, a combining main shaft 30, and a sliding combining piece 31. The combining box 29 is disposed in the driving assembly 28. The combining box 29 is connected to the liquid storage chambers 14 at both ends through pipelines. The combining main shaft 30 is rotatably disposed in the combining box 29. A cylindrical portion 39 and a polygonal sliding portion 40 are provided on the combining main shaft 30. The sliding combining piece 31 is engaged and slidably disposed on the polygonal sliding portion 40. A rotating connection groove 41 is provided on the sliding combining piece 31.

[0044] The squeezing and engaging assembly 27 includes a fixed combining piece 32, a clutch piston 33, and a separating spring 34. The fixed combining piece 32 is fixedly connected to the slip welding mechanism 4. The clutch piston 33 is engaged and slidably disposed between the combining box 29 and the cylindrical portion 39. The separating spring 34 is disposed between the clutch piston 33 and the combining box 29. The protruding portion of the separating spring 34 is rotatably connected to the rotating connection groove 41.

[0045] By controlling the combination and separation of the fixed combining piece 32 and the sliding combining piece 31, it is possible to control whether the driving assembly 28 can drive the slip 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. Through the flow design of the transmission fluid, the sliding combining piece 31 and the fixed combining piece 32 can be squeezed and combined only after the central sliding rods 13 at both ends are all adsorbed.

[0046] 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 cross beam 6. The driving motor 36 and the coupling box 29 are snap-fitted 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. The driving gear 37 and the driven gear 38 are meshed for transmission.

[0047] During specific use, first, the user needs to clamp and fix the clamping bracket 5. The adsorption device 7 can select solutions such as suction cups or magnetic adsorption. Select a welding torch 54 with a safety protection function. Such a welding torch 54 can only perform welding when sliding relative to the workpiece and cannot perform welding when it does not move relative to the workpiece itself. Then, adjust the positions of this device and the sheet metal workpiece 8. After adjusting the relative positions of the two sheet metal workpieces 8, welding can be carried out. During the adjustment process, the dual magnetic adsorption positioning mechanism 2 can provide feedback on whether the relative positions of the two sheet metal workpieces 8 are in place. The process is as follows: After the two sheet metal workpieces 8 are fitted together, only the position needs to be adjusted in the plane. Because two points can determine a position in the plane, when a pair of opposite magnetic suction cups 21 coincide, they can drive the piston disc 23 to slide through mutual attraction, thereby pushing the liquid in the liquid storage cavity 14 into the coupling box 29. However, since a certain pressure is required to push the liquid, the magnetic suction cups 21 need to have a certain size. Therefore, in order to avoid the situation where the opposite magnetic suction cups 21 partially coincide and trigger sliding before being coaxial, the magnetic adsorption unlocking component 10 is also required to lock and protect the magnetic adsorption pushing component 9. Since the magnetic adsorption column 17 only needs to drive the locking tongue 15 to slide, the diameter of the magnetic adsorption column 17 can be very small, and the positioning accuracy will naturally be higher. When all the surrounding magnetic adsorption columns 17 are in corresponding positions and adsorbed, the magnetic adsorption column 17 pulls the locking tongue 15 through the linkage rope 24, thereby unlocking the locking disc 22. At this time, the central slide rod 13 will slide in the central slide hole 19.

[0048] After the liquid enters the coupling box 29 from the liquid storage cavity 14, it will cause the sliding coupling piece 31 to slide towards the fixed coupling piece 32 by pushing the clutch piston 33. Through the design of the liquid flow rate, when only one end of the liquid storage cavity 14 supplies liquid to the coupling box 29, it is not enough to press the sliding coupling piece 31 and the fixed coupling piece 32 together. When both ends of the liquid storage cavity 14 supply liquid to the coupling box 29, the sliding coupling piece 31 and the fixed coupling piece 32 will contact and squeeze. Before the fixed engagement piece 32 and the sliding engagement piece 31 are engaged, even if the drive motor 36 is started, the transmission lead screw 45 will not be driven to rotate. After the fixed engagement piece 32 and the sliding engagement piece 31 are engaged and the drive motor 36 is started, the transmission lead screw 45 will rotate accordingly. Through the transmission of the transmission lead screw 45 and the nut 46 and the guidance of the guide rail 48 and the slider 49, the rotation of the transmission lead screw 45 can drive the slide plate 47 and the telescopic tracking assembly 43 to slide along the intersection line of the two sheet metal workpieces 8.

[0049] If the intersection line of the two sheet metal workpieces 8 is not a straight line but a gentle curve, at this time, under the guidance of the guide rod 55 and the elastic force of the tracking spring 52, the end of the welding torch 54 for welding can always slide along the edge of one sheet metal workpiece 8. Thus, when the slide plate 47 slides along a straight line, the technical effect of the welding torch 54 sliding along the actual edge of the sheet metal workpiece 8 is achieved.

[0050] After welding is completed, only need to take away the welded sheet metal workpiece 8 by the manipulator in the next process, and then the double magnetic attraction positioning mechanism 2 can be separated by moving the workpiece clamping assembly 1 away. At this time, first, the magnetic attraction column 17 will reset under the elastic force of the reset tension spring 25. The locking tongue 15 can be reset by pushing against the linkage rope 24, or the reset tension spring 25 can be arranged at the end of the locking tongue 15 and the chute 56 to reset the locking tongue 15 and the magnetic attraction column 17 at the same time; then the sliding engagement piece 31 and the clutch piston 33 will move away from the fixed engagement piece 32 under the elastic force of the separation spring 34. At the same time, the clutch piston 33 will push the liquid in the combination box 29 back into the two liquid storage cavities 14, and at the same time, the central slide rod 13 will slide up and reset.

[0051] It should be noted that in this article, relational terms such as first and second are only used 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 term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0052] The above describes the present invention and its embodiments. This description is not restrictive. What is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. All in all, if those of ordinary skill in the art are inspired by it and without departing from the purpose of the present invention, without creative design, structures and embodiments similar to the technical solution are all within the protection scope of the present invention.

Claims

1. An automatic welding device for automobile body parts, characterized in that: It includes a workpiece clamping assembly (1), a dual magnetic attraction positioning mechanism (2), a hydraulic clutch mechanism (3) and a sliding welding mechanism (4). There are two groups of workpiece clamping assemblies (1). The dual magnetic attraction 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). The sliding welding mechanism (4) is arranged on the workpiece clamping assembly (1). The dual magnetic attraction positioning mechanism (2) includes a magnetic attraction pushing component (9) and a magnetic attraction unlocking component (10). The magnetic attraction pushing component (9) is arranged on the workpiece clamping assembly (1). The magnetic attraction unlocking component (10) is annularly and evenly distributed in the magnetic attraction pushing component (9). The hydraulic clutch mechanism (3) includes a rotating component (26), a squeezing and combining component (27) and a driving component (28). The rotating component (26) is arranged in the driving component (28). The squeezing and combining component (27) is arranged in the rotating component (26). The driving component (28) is arranged on the workpiece clamping assembly (1).

2. The automatic welding device for an automobile body part according to claim 1, characterized in that: The workpiece clamping assembly (1) includes a cross beam (6). The magnetic attraction pushing component (9) includes a positioning bracket (11), a positioning cylinder (12), a central sliding rod (13) and a liquid storage cavity (14). The positioning bracket (11) is fixedly connected to both ends of the cross beam (6). The positioning cylinder (12) is arranged in the positioning bracket (11). The positioning cylinder (12) is provided with a through central sliding hole (19) and an eccentric sliding hole (20). The top of the eccentric sliding hole (20) is provided with a sliding groove (56). The central sliding rod (13) is clamped and slidably arranged in the central sliding hole (19). A magnetic suction disc (21), a locking disc (22) and a piston disc (23) are sequentially arranged on the central sliding rod (13). The locking disc (22) and the magnetic suction disc (21) are slidably arranged in the central sliding hole (19). The liquid storage cavity (14) is arranged on the positioning cylinder (12). The piston disc (23) is clamped and slidably arranged in the liquid storage cavity (14).

3. The automatic welding device for an automobile body part according to claim 2, characterized in that: The magnetic attraction unlocking component (10) includes a locking tongue (15), a steering column (16), a magnetic attraction column (17) and a limit retaining ring (18). The locking tongue (15) is clamped and slidably arranged in the sliding groove (56). The steering column (16) is fixedly connected to the eccentric sliding hole (20). A linkage rope (24) is arranged between the locking tongue (15) and the magnetic attraction column (17). The linkage rope (24) bypasses the steering column (16). The magnetic attraction column (17) is slidably arranged in the eccentric sliding hole (20). The limit retaining ring (18) is fixedly connected to the eccentric sliding hole (20). A return spring (25) is arranged between the limit retaining ring (18) and the magnetic attraction column (17).

4. An automatic welding device for an automobile body part according to claim 3, characterized in that: 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) is connected to the liquid storage cavities (14) at both ends through pipelines. The coupling main shaft (30) is rotatably arranged in the coupling box (29). A cylindrical portion (39) and a polygonal sliding portion (40) are provided on the coupling main shaft (30). The sliding coupling piece (31) is snap-fitted and slidably arranged on the polygonal sliding portion (40), and a rotating connection groove (41) is provided on the sliding coupling piece (31).

5. The automatic welding device for an automobile body part according to claim 4, 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 snap-fitted 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 protruding portion of the separation spring (34) is rotatably connected to the rotating connection groove (41).

6. The automatic welding device for an automobile body part according to claim 5, 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). The motor base (35) is arranged on the cross beam (6). The driving motor (36) and the coupling box (29) are snap-fitted 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 driven with each other.

7. An automatic welding device for an automobile body part according to claim 6, characterized in that: The sliding welding mechanism (4) includes a lateral sliding assembly (42) and a telescopic tracking assembly (43). The lateral sliding assembly (42) is arranged on the cross beam (6), and the telescopic tracking assembly (43) is arranged on the lateral sliding assembly (42).

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

9. An automatic welding device for an automobile body part according to claim 7, characterized in that: The lateral sliding assembly (42) includes a lead screw support (44), a transmission lead screw (45), a nut (46), a slide plate (47), a guide rail (48), and a slider (49). The lead screw support (44) is arranged on the cross beam (6). The transmission lead screw (45) is rotatably arranged in the lead screw support (44). The fixed coupling piece (32) is fixedly connected to one end of the transmission lead screw (45). The nut (46) is in threaded transmission with the transmission lead screw (45). The nut (46) is snap-fitted in the slide plate (47). The guide rail (48) is arranged on the cross beam (6). The slider (49) is snap-fitted and slidably arranged on the guide rail (48), and the slider (49) is fixedly connected to the slide plate (47).

10. The automatic welding device for an automotive body part according to claim 9, 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 torch (54). The telescopic base (50) is arranged on the sliding plate (47). A guide rod (55) is arranged 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 torch (54) is arranged on the L-shaped plate (53). The end of the welding torch (54) slides along the edge of the sheet metal workpiece (8).

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