A spot welding robot for automotive parts

Abstract

The present invention relates to the technical field of spot welding of automotive parts, and particularly to a spot welding robot for automotive parts, including a fixed conveying mechanism and a positioning and welding mechanism. The fixed conveying mechanism is placed on the ground, and the positioning and welding mechanism is arranged at the rear of the fixed conveying mechanism. The present invention intermittently conveys and moves the inner door panel through the fixed conveying mechanism while cleaning the surface, preventing particulate dirt from affecting the full adhesion between the inner door panel and the reinforcing rib. Through the positioning and welding mechanism, the inner door panel and the reinforcing rib are first positioned and fixedly integrated, and then the two sides of the welding point and the welding head are successively locally pressed for stable and sufficient welding and pressure holding after spot welding, improving the welding effect.

Description

Technical Field

[0001] The present invention relates to the technical field of spot welding of automotive parts, and specifically to a spot welding robot for automotive parts. Background Art

[0002] Spot welding is a resistance welding method. By passing an electric current through the contact points of two or more metal workpieces, heat is generated to melt the metal and form solder joints. Spot welding is widely used in automobile manufacturing, especially in the body assembly process. The stiffeners of the inner door panel are installed through spot welding technology. The stiffeners of the inner door panel play a key role in the automobile structure. Most of them use long strip cap-shaped stiffeners, which not only enhance the rigidity and impact resistance of the door, but also improve the stability of the overall body.

[0003] During the process of spot welding and installing the inner door panel and the stiffener, the welding position of the inner door panel is not cleaned, and there is dirt on the inner door panel, which affects the full fit between the inner door panel and the stiffener, resulting in a reduction in the strength of spot welding. Secondly, only the inner door panel and the stiffener are integrally limited and fixed, and the two sides of the welding point between the inner door panel and the stiffener are not pressed, resulting in gaps easily existing at the welding position during spot welding, affecting the connection strength. Summary of the Invention

[0004] Technical problems to be solved: A spot welding robot for automotive parts provided by the present invention can solve the problems pointed out in the above background art.

[0005] Technical solution: To achieve the above objectives, the present invention adopts the following technical solution. A spot welding robot for automotive parts includes a fixed conveying mechanism and a positioning welding mechanism. The fixed conveying mechanism is placed on the ground, and a positioning welding mechanism is arranged behind the fixed conveying mechanism.

[0006] The fixed conveying mechanism includes a conveyor. A front baffle is installed on the front side of the conveyor, and a rear baffle is installed on the rear side of the conveyor. The middle part of the rear baffle is in the shape of a stepped plate with the left side lower and the right side higher. A cleaning component for cleaning the welding position is arranged at the right side position of the rear baffle. A clamping edge component for flexibly fixing the inner door panel is installed on the conveyor in a detachable manner.

[0007] The positioning welding mechanism includes a mounting base arranged on the ground. A sliding track is opened on the upper end surface of the mounting base. A sliding pillar is slidably installed in the sliding track. A limiting component for positioning and fixing the stiffener is installed at the upper end of the sliding pillar. A spot welding component for welding and fixing the inner door panel and the stiffener is arranged on the limiting component.

[0008] Further, the cleaning component includes a C-shaped plate which is arranged with an opening facing forward. Brush hairs are uniformly arranged at the upper and lower ends inside the C-shaped plate, and the brush hairs at the upper and lower positions are arranged in a staggered manner up and down. Suction holes are uniformly formed at the positions between the brush hairs at the upper and lower ends inside the C-shaped plate. A storage box is detachably arranged at the position corresponding to the rear end face of the rear baffle and the C-shaped plate. An air suction pump is installed on the storage box, and all the suction holes are communicated with the storage box.

[0009] Further, the clamping edge component includes a fixed frame. On the upper inner wall of the fixed frame, clamping plates are symmetrically installed up and down. An air bag is installed on the lower end face of the upper clamping plate. A plurality of rollers are rotatably embedded at the positions between the two clamping plates on the left and right inner walls of the fixed frame.

[0010] Further, the fixed frame and the clamping plates are both C-shaped structures with openings facing backward. Semi-circular protrusions are arranged in the middle of the outer end faces of the fixed frames. Positioning groups are uniformly arranged on the conveyor belt of the conveyor.

[0011] Further, the positioning group is a plurality of positioning blocks corresponding to the positions of the semi-circular protrusions of the fixed frame. Semi-circular grooves are formed on the positioning blocks and are matched with the semi-circular protrusions of the fixed frame.

[0012] Further, the limiting component includes an L-shaped frame. The bottom of the vertical section of the L-shaped frame is installed on the sliding support column. On the end face of the vertical section of the L-shaped frame close to the positioning group, positioning plates are symmetrically installed left and right. An electric telescopic rod is installed on the lower end face of the horizontal section of the L-shaped frame. The telescopic end of the electric telescopic rod is installed with a cross plate. Connecting rods are installed at the positions close to the left and right sides of the lower end face of the cross plate. A pressing plate is jointly installed at the lower ends of the two connecting rods. A trapezoidal groove is formed at the position between the two connecting rods at the lower end of the pressing plate. A stabilizing rib is arranged between the connecting rod and the pressing plate.

[0013] Further, a positioning long hole is formed at the front part of the positioning plate. Stopping blocks are installed on the opposite faces of the front parts of the two positioning plates. A positioning groove is formed at the position corresponding to the pressing plate on the upper end face of the positioning plate. A support rod is jointly connected to the lower end faces of the front parts of the two positioning plates.

[0014] Further, the spot welding component includes a telescopic cylinder. The telescopic cylinder is embedded and installed at the middle position between the two positioning plates on the vertical section of the L-shaped frame. Support telescopic rods are embedded and installed on the left and right sides of the telescopic cylinder. A displacement box is jointly installed on the telescopic ends of the telescopic cylinder and the support telescopic rods. An installation groove is formed in the middle of the front end of the displacement box. A transverse screw rod is rotatably installed in the installation groove. One end of the transverse screw rod extends outside the displacement box. An intermittent rotation motor is installed on the displacement box through a motor seat. The output shaft of the intermittent rotation motor is connected to the transverse screw rod extending outside the displacement box. An installation frame is threadedly connected to the transverse screw rod. The installation frame is a C-shaped structure with an opening facing forward.

[0015] Further, a limiting groove is vertically opened on the front end face of the vertical section of the mounting frame. Two sliding long blocks are symmetrically and slidably arranged up and down in the limiting groove. A welding head is installed on the front side of the opposite faces of the two sliding long blocks. Linkage grooves are opened at the positions on the left and right sides of the limiting groove of the mounting frame. A bidirectional threaded rod is rotatably installed in each linkage groove. The upper ends of the bidirectional threaded rods all extend outside the mounting frame. The rotating motor is installed on the mounting frame through a motor seat. The upper end of one of the bidirectional threaded rods is connected to the output shaft of the rotating motor. The outer walls of the two bidirectional threaded rods extending outside the mounting frame are connected through a pulley group. The outer walls of the bidirectional threaded rods are symmetrically threaded with linkage blocks up and down. A plurality of connecting bars are evenly arranged from front to back on the opposite faces of the adjacent linkage blocks on the left and right. Vertical through holes are opened at the positions corresponding to the side end faces of the sliding long blocks. The middle parts of the connecting bars are slidably arranged up and down in the vertical through holes.

[0016] Further, spring telescopic rods are installed at the positions corresponding to the welding head on the upper and lower opposite faces of the linkage block. The telescopic ends of the spring telescopic rods are installed with pressing plates. The length dimension of the welding head is smaller than the length dimension of the spring telescopic rod. A plurality of convex plates arranged from front to back are jointly installed on two adjacent linkage blocks on the left and right. Extrusion springs are installed at the protruding positions of the convex plates. The other ends of the extrusion springs are installed on the sliding long blocks.

[0017] Beneficial effects:

[0018] 1. The fixed conveying mechanism intermittently conveys and moves the inner panel of the car door while cleaning the surface, preventing particulate dirt from affecting the full fit between the inner panel of the car door and the reinforcing rib. The positioning welding mechanism first positions and integrally fixes the inner panel of the car door and the reinforcing rib, and then sequentially performs stable and full welding on both sides of the welding point and local pressing on the welding head, as well as pressure holding after spot welding, improving the welding effect.

[0019] 2. The brush of the cleaning component sweeps and cleans the upper and lower sides of the inner panel of the car door. The particulate debris cleaned is sucked into the storage box through the suction pump from the adsorption holes for collection, which can prevent particulate debris from affecting the full fit between the inner panel of the car door and the reinforcing rib, resulting in insufficient welding.

[0020] 3. Through the cooperation of multiple connecting bars, convex plates and extrusion springs in the welding component, the pressing plate first presses the reinforcing rib and the inner panel of the car door, and then the welding head abuts against the corresponding reinforcing rib and the inner panel of the car door. The pressing plate locally presses the two sides of the welding point position of the reinforcing rib and the inner panel of the car door up and down to ensure close contact at the welding point position of the reinforcing rib and the inner panel of the car door. Then the linkage block continues to move, so that the extrusion spring further elastically presses the welding head to ensure the pressing force of the welding head. As the welding position moves, the pressing plate can press and hold the previous spot welding position up and down, greatly improving the welding effect. Description of the drawings

[0021] Figure 1 Partial structural schematic of the present invention Figure 1 .

[0022] Figure 2 Of the present invention Figure 1 Top view cross-sectional view of enlarged view A of the present invention.

[0023] Figure 3 Of the present invention Figure 1 Enlarged view B of the present invention.

[0024] Figure 4 Of the present invention Figure 1 Enlarged view C of the present invention.

[0025] Figure 5 Partial structural schematic of the figure of the present invention Figure 2 .

[0026] Figure 6 Of the present invention Figure 1 Top view of the present invention.

[0027] Figure 7 Of the present invention Figure 6 Cross-sectional view taken along line D-D of the present invention.

[0028] Figure 8 Of the present invention Figure 7 Enlarged view E of the present invention.

[0029] Figure 9 Structural schematic diagram of the spot welding assembly of the present invention.

[0030] In the figure: 1. Fixed conveyor mechanism; 11. Conveyor; 12. Front baffle; 13. Rear baffle; 14. Cleaning component; 141. C-shaped plate; 142. Brush bristles; 143. Adsorption holes; 144. Storage box; 15. Clamping edge component; 151. Fixed frame; 152. Clamping plate; 153. Airbag; 154. Roller; 155. Semi-circular protrusion; 156. Positioning block; 2. Positioning and welding mechanism; 21. Installation base; 22. Sliding track; 23. Sliding strut; 24. Limiting component; 241. L-shaped frame; 242. Positioning plate; 243. Electric telescopic rod; 244. Cross plate; 245. Connecting rod; 246. Pressing plate; 247. Stabilizing rib; 248. Stopper; 249. Support rod; 25. Spot welding component; 251. Telescopic cylinder; 252. Support telescopic rod; 253. Displacement box; 254. Transverse screw rod; 255. Intermittent rotation motor; 256. Mounting frame; 257. Limiting groove; 258. Sliding long block; 259. Linkage groove; 2510. Bidirectional threaded rod; 2511. Rotating motor; 2512. Pulley group; 2513. Linkage block; 2514. Connecting strip; 2515. Spring telescopic rod; 2516. Pressing plate; 2517. Convex plate; 2518. Extrusion spring; 2519. Vertical through hole; 2520. Welding head; 3. Inner door panel; 4. Reinforcing rib. Detailed implementation manners

[0031] 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. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0032] Please refer to Figure 1 , Figure 4 , Figure 5 , Figure 6, the present invention provides a technical solution: an automotive parts spot welding robot, including a fixed conveying mechanism 1 and a positioning and welding mechanism 2. The fixed conveying mechanism 1 is placed on the ground, and the positioning and welding mechanism 2 is arranged at the rear side of the fixed conveying mechanism 1. The fixed conveying mechanism 1 includes a conveyor 11, a front baffle 12 is installed on the front side of the conveyor 11, a rear baffle 13 is installed on the rear side of the conveyor 11. The middle part of the rear baffle 13 is in a stepped plate-like structure with the left side lower and the right side higher. A cleaning component 14 for cleaning the welding position is arranged at the right side position of the rear baffle 13. A clamping edge component 15 for flexibly fixing the inner door panel 3 is installed on the conveyor 11 in a detachable manner. The positioning and welding mechanism 2 includes a mounting base 21, the mounting base 21 is arranged on the ground, a sliding track 22 is opened on the upper end surface of the mounting base 21, a sliding pillar 23 is slidably installed in the sliding track 22, a limiting component 24 for positioning and fixing the reinforcing rib 4 is installed at the upper end of the sliding pillar 23, and a spot welding component 25 for welding and fixing the inner door panel 3 and the reinforcing rib 4 is arranged on the limiting component 24. During operation, the inner door panel 3 is placed on the clamping edge component 15, and the clamping edge component 15 clamps and fixes the edge position of the inner door panel 3. The conveyor 11 intermittently moves the clamping edge component 15 and the inner door panel 3 to the left. During the movement, it will pass through the cleaning component 14, and the cleaning component 14 cleans and adsorbs and collects the position to be welded. When moving to the position of the positioning and welding mechanism 2, the conveyor 11 intermittently stops, and moves through the cooperation of the sliding track 22 and the sliding pillar 23, and moves the limiting component 24 to the designated position. The limiting component 24 first limits the placement of the reinforcing rib 4, and then the reinforcing rib 4 is placed in the limiting position by manual or mechanical means. After that, the limiting component 24 presses and fixes the reinforcing rib 4, and finally the spot welding component 25 performs multi-position sequential spot welding on the reinforcing rib 4 and the inner door panel 3.

[0033] Please refer to Figure 2 , Figure 5, in this embodiment, the cleaning component 14 includes a U-shaped plate 141 which is arranged with an opening facing forward. Brush hairs 142 are evenly arranged at the upper and lower ends inside the U-shaped plate 141, and the brush hairs 142 at the upper and lower positions are arranged in a staggered manner up and down. Suction holes 143 are evenly formed at the positions between the brush hairs 142 at the upper and lower ends inside the U-shaped plate 141. A storage box 144 is detachably arranged at the position corresponding to the rear end face of the rear baffle 13 and the U-shaped plate 141. An air suction pump (not shown in the figure) is installed on the storage box 144, and all the suction holes 143 are communicated with the storage box 144. During operation, when the inner door panel 3 moves past the inside of the U-shaped plate 141, the upper and lower brushes clean the upper and lower sides of the position on the inner door panel 3 that needs to be welded. The particulate debris cleaned is sucked into the storage box 144 through the existing air suction pump from the suction holes 143 for collection, thereby improving the cleaning effect. By cleaning the surface of the welding position of the inner door panel 3, it can prevent particulate debris from affecting the full fit between the inner door panel 3 and the reinforcing rib 4, resulting in insufficient welding.

[0034] Please refer to Figure 7 , in this embodiment, the clamping edge component 15 includes a fixed frame 151. Upper and lower symmetrically mounted clamping plates 152 are arranged on the inner wall of the upper part of the fixed frame 151. An airbag 153 is mounted on the lower end face of the upper clamping plate 152. A plurality of rollers 154 are rotatably embedded at the positions between the two clamping plates 152 on the left and right inner walls of the fixed frame 151. The fixed frame 151 and the clamping plates 152 are both U-shaped structures with openings facing backward, and semi-circular protrusions 155 are arranged in the middle of the outer end faces of the fixed frame 151. Positioning groups are evenly arranged on the conveyor belt of the conveyor 11. During operation, the plurality of rollers 154 provided can play a role in guiding and reducing friction when the inner door panel 3 enters the fixed frame 151, facilitating entry and placement. Subsequently, the airbag 153 is activated, and the airbag 153 cooperates with the lower clamping plate 152 to flexibly clamp multiple edge positions of the inner door panel 3 inside the fixed frame 151, thereby stably fixing the inner door panel 3. The positioning groups are a plurality of positioning blocks 156 corresponding to the positions of the semi-circular protrusions 155 of the fixed frame 151. Semi-circular grooves are formed on the positioning blocks 156 to cooperate with the semi-circular protrusions 155 of the fixed frame 151. By the cooperation of the semi-circular grooves on the plurality of positioning blocks 156 and the semi-circular protrusions 155 of the fixed frame 151, the fixed frame 151 can be limited on the conveyor 11, ensuring the stability during movement.

[0035] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 8, in this embodiment, the limiting component 24 includes an L-shaped frame 241. The bottom of the vertical section of the L-shaped frame 241 is installed on the sliding support column 23. Positioning plates 242 are symmetrically installed on the left and right sides of the end face of the vertical section of the L-shaped frame 241 close to the clamping group. An electric telescopic rod 243 is installed on the lower end face of the horizontal section of the L-shaped frame 241. A cross plate 244 is installed at the telescopic end of the electric telescopic rod 243. Connecting rods 245 are installed at positions close to the left and right sides of the lower end face of the cross plate 244. A pressing plate 246 is jointly installed at the lower ends of the two connecting rods 245. A trapezoidal groove is formed at the position between the two connecting rods 245 at the lower end of the pressing plate 246. A stabilizing rib 247 is arranged between the connecting rod 245 and the pressing plate 246; the stability of the connection between the connecting rod 245 and the pressing plate 246 is improved through the stabilizing rib 247. A clamping long hole is formed in the front part of the positioning plate 242. Stopping blocks 248 are installed on the opposite front faces of the two positioning plates 242. A positioning groove is formed at the position corresponding to the upper end face of the positioning plate 242 and the pressing plate 246. A support rod 249 is jointly connected to the lower end faces of the front parts of the two positioning plates 242; during operation, when the sliding support column 23 drives the L-shaped frame 241 to move to a specified position, the front part of the positioning plate 242 moves to the position where welding is required. The position for placing the reinforcing rib 4 is limited by the cooperation between the upper front part of the positioning plate 242 and the stopping block 248. The front lower part of the positioning plate 242 and the support rod 249 stably support the inner door panel 3, preventing the inner door panel 3 from deforming due to the downward pressure of the pressing plate 246. Then, the reinforcing rib 4 is placed. Subsequently, the electric telescopic rod 243 above extends outward, driving the cross plate 244, the connecting rod 245, and the pressing plate 246 to move downward. The pressing plate 246 moves downward and enters the positioning groove, clamping and limiting the position of the positioning plate 242. At the same time, the lower end of the pressing plate 246 presses tightly on the upper part of the reinforcing rib 4. The structure of the trapezoidal groove is matched with that of the reinforcing rib 4, and can also limit the front and rear directions of the reinforcing rib 4 to a certain extent, thereby improving the stability of the fixing of the reinforcing rib 4.

[0036] Please refer to Figure 1 , Figure 9, in this embodiment, the spot welding assembly 25 includes a telescopic cylinder 251. The vertical section of the L-shaped frame 241 is embedded with a telescopic cylinder 251 at the middle position between the two positioning plates 242. Support telescopic rods 252 are embedded on the left and right sides of the telescopic cylinder 251 to improve the stability of movement. A displacement box 253 is jointly installed on the telescopic ends of the telescopic cylinder 251 and the support telescopic rods 252. An installation groove is formed in the middle of the front end of the displacement box 253, and a transverse screw rod 254 is rotatably installed in the installation groove. One end of the transverse screw rod 254 extends outside the displacement box 253. An intermittent rotation motor 255 is installed on the displacement box 253 through a motor base. The output shaft of the intermittent rotation motor 255 is connected to the transverse screw rod 254 extending outside the displacement box 253. An installation frame 256 is threadedly connected to the transverse screw rod 254. The installation frame 256 is in a U-shaped structure with an opening facing forward; a limiting groove 257 is vertically formed on the front end face of the vertical section of the installation frame 256, and two sliding long blocks 258 are symmetrically and slidably arranged up and down in the limiting groove 257. A welding head 2520 is installed on the front side of the opposite faces of the two sliding long blocks 258. Linkage grooves 259 are formed at the positions on the left and right sides of the installation frame 256 where the limiting groove 257 is located, and bidirectional screw rods 2510 are rotatably installed in the linkage grooves 259. The upper ends of the bidirectional screw rods 2510 all extend outside the installation frame 256. A rotation motor 2511 is installed on the installation frame 256 through a motor base. The upper end of one of the bidirectional screw rods 2510 is connected to the output shaft of the rotation motor 2511. The outer walls of the two bidirectional screw rods 2510 extending outside the installation frame 256 are connected through a pulley group 2512. Linkage blocks 2513 are symmetrically and threadedly connected to the outer walls of the bidirectional screw rods 2510 up and down. A plurality of connecting strips 2514 are evenly arranged from front to back on the opposite faces of the adjacent linkage blocks 2513 on the left and right. Vertical through holes 2519 are formed at the corresponding positions of the side end faces of the sliding long blocks 258, and the middle parts of the connecting strips 2514 slide up and down in the vertical through holes 2519.Spring telescopic rods 2515 are installed at the positions corresponding to the upper and lower opposite surfaces of the linkage block 2513 and opposite to the welding head 2520. A pressing plate 2516 is installed at the telescopic end of the spring telescopic rod 2515. The length dimension of the welding head 2520 is smaller than the length dimension of the spring telescopic rod 2515. A plurality of convex plates 2517 arranged from front to back are jointly installed on two adjacent linkage blocks 2513 on the left and right. Extrusion springs 2518 are installed at the protruding positions of the convex plates 2517, and the other ends of the extrusion springs 2518 are installed on the sliding long block 258. During operation, after the reinforcing rib 4 is fixed, the telescopic cylinder 251 extends outwards, driving the supporting telescopic rods 252 on both sides to extend synchronously, so that the displacement box 253 approaches the welding position. When it moves to the welding position, the rotary motor 2511 is started to drive the two bidirectional threaded rods 2510 to rotate synchronously through the pulley group 2512, so that the upper and lower corresponding linkage blocks 2513 move towards each other. With the cooperation of the plurality of convex plates 2517 and the extrusion springs 2518, the linkage block 2513 drives the corresponding sliding long block 258 to move synchronously while moving, so as to drive the welding head 2520 and the pressing plate 2516 to approach the position of the inner door panel 3. During the movement, the pressing plate 2516 first contacts the reinforcing rib 4 and the inner door panel 3, and then continues to move to squeeze the spring telescopic rod 2515. After that, the welding head 2520 also abuts against the corresponding reinforcing rib 4 and the inner door panel 3. The linkage block 2513 continues to drive the pressing plate 2516 to move downward to further squeeze the spring telescopic rod 2515. At this time, the welding head 2520 cannot move any further, and the connecting strip 2514 slides in the vertical through hole 2519 while the convex plate 2517 presses the extrusion spring 2518. The welding head 2520 is further elastically pressed by the force of the extrusion spring 2518 to ensure the pressing force of the welding head 2520. The pressing plate 2516 presses the two sides of the welding point position between the reinforcing rib 4 and the inner door panel 3 up and down to ensure that the reinforcing rib 4 and the inner door panel 3 are fully pressed and contacted, reduce the gap, and improve the welding stability. When the welding of this welding point is completed, the pressing plate 2516 and the welding head 2520 return to the original position. The intermittent rotation motor 255 is started to drive the transverse screw rod 254 to rotate forward to drive the mounting frame 256 to move left to the next position to be welded, and the above operations are repeated for spot welding in sequence. During the process of spot welding the next position, the pressing plate 2516 can continuously press and maintain pressure on the position of the previous spot welding up and down. Repeat this way. When all the spot welding on the rear side of the reinforcing rib 4 is completed, the telescopic cylinder 251 extends out a further distance, so that the pressing plate 2516 and the welding head 2520 move to the front side position of the reinforcing rib 4. The intermittent rotation motor 255 drives the transverse screw rod 254 to rotate reversely to perform spot welding on the front side position of the reinforcing rib 4 in sequence to the right.

[0037] During specific operation, the inner door panel 3 is smoothly guided into the fixed frame 151 by multiple rollers 154. Subsequently, the airbag 153 is activated. The airbag 153 cooperates with the lower clamping plate 152 to flexibly clamp multiple edge positions of the inner door panel 3 within the fixed frame 151, ensuring both the stability of clamping and not damaging the inner door panel 3. Then, the conveyor 11 moves the edge clamping assembly 15 and the inner door panel 3 to the left intermittently. During the movement, they pass through the cleaning assembly 14. When the inner door panel 3 moves through the inside of the U-shaped plate 141, the upper and lower brushes clean the upper and lower sides of the welding position of the inner door panel 3. The cleaned particulate debris is sucked into the storage box 144 through the existing suction pump from the suction holes 143 for collection, thereby improving the cleaning effect. By cleaning the surface of the welding position of the inner door panel 3, it can prevent particulate debris from affecting the full fit between the inner door panel 3 and the reinforcing rib 4, resulting in insufficient welding. When the conveyor 11 drives the edge clamping assembly 15 and the inner door panel 3 to move to the positioning and welding mechanism 2, the conveyor 11 stops intermittently. The limiting component 24 is moved to the designated position by the cooperation of the sliding track 22 and the sliding support 23. At this time, the front part of the positioning plate 242 moves to the welding position. The position for placing the reinforcing rib 4 is limited by the cooperation of the positioning plate 242 and the stop block 248. Subsequently, the reinforcing rib 4 is placed. Then, the upper electric telescopic rod 243 extends outward, driving the cross plate 244, the connecting rod 245, and the pressing plate 246 to move downward. The pressing plate 246 moves downward into the positioning groove to clamp and limit the position of the positioning plate 242. At the same time, the lower end of the pressing plate 246 presses against the upper part of the reinforcing rib 4. The structure of the trapezoidal groove cooperates with the reinforcing rib 4, and can also limit the front and rear directions of the reinforcing rib 4 to a certain extent, improving the stability of the fixing of the reinforcing rib 4;After the reinforcing rib 4 is fixed, the telescopic cylinder 251 is extended outward, driving the supporting telescopic rods 252 on both sides to extend outward synchronously, so that the displacement box 253 is close to the welding position. After moving to the welding position, the rotating motor 2511 is started to drive the two bidirectional threaded rods 2510 to rotate synchronously through the pulley group 2512, so that the upper and lower corresponding linkage blocks 2513 move toward each other. When the multiple convex plates 2517 and the extrusion springs 2518 cooperate, the linkage blocks 2513 move and drive the corresponding sliding long blocks 258 to move synchronously, thereby The welding head 2520 and the clamping plate 2516 are driven to approach the position of the door inner panel 3. During the movement, the clamping plate 2516 first contacts the reinforcing rib 4 and the door inner panel 3, and then continues to move to squeeze the spring telescopic rod 2515. After that, the welding head 2520 also conflicts with the corresponding reinforcing rib 4 and the door inner panel 3. The linkage block 2513 continues to drive the clamping plate 2516 to move downward to further squeeze the spring telescopic rod 2515. At this time, the welding head 2520 cannot move further, and the connecting strip 2514 slides in the vertical through hole 2519. At the same time, the convex plate 2517 compresses the extrusion spring 2518, and further elastically compresses the welding head 2520 through the force of the extrusion spring 2518 to ensure the clamping force of the welding head 2520, and compresses the two sides of the welding point of the reinforcing rib 4 and the door inner panel 3 up and down through the clamping plate 2516 to ensure that the reinforcing rib 4 and the door inner panel 3 are fully compressed and contacted, the gap is reduced, and the welding stability is improved; when the welding of this welding point is completed, the clamping plate 2516 and the welding head 2520 return to the original position, and the intermittent rotating motor 255 is started to drive the transverse screw 254 to rotate forward to drive The mounting frame 256 moves to the left to the next position to be welded, and repeats the above operation to perform spot welding in sequence. When spot welding is performed on the next position, the clamping plate 2516 can continuously press and hold the previous spot welding position up and down, and repeat this process. When all spot welding is completed on the rear side of the reinforcing rib 4, the telescopic cylinder 251 extends outward for a distance, so that the clamping plate 2516 and the welding head 2520 move to the front side of the reinforcing rib 4, and the intermittent rotating motor 255 drives the transverse screw 254 to reverse and perform spot welding on the front side of the reinforcing rib 4 in sequence to the right. ;

[0038] It should be noted that, in this document, 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 variation thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising said element.

[0039] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automotive parts spot welding robot, comprising a fixed conveying mechanism (1) and a positioning welding mechanism (2), characterized in that: The fixed conveyor mechanism (1) is placed on the ground, and a positioning and welding mechanism (2) is arranged at the rear of the fixed conveyor mechanism (1); The fixed conveyor mechanism (1) includes a conveyor (11). A front baffle (12) is installed on the front side of the conveyor (11), and a rear baffle (13) is installed on the rear side of the conveyor (11). The middle part of the rear baffle (13) is in a stepped plate-like structure with the left side lower and the right side higher. A cleaning component (14) for cleaning the welding position is arranged at the right side position of the rear baffle (13). A clamping edge component (15) for flexibly fixing the inner door panel (3) is installed on the conveyor (11) in a detachable manner; The positioning and welding mechanism (2) includes a mounting base (21). The mounting base (21) is arranged on the ground. A sliding track (22) is opened on the upper end surface of the mounting base (21). A sliding pillar (23) is slidably installed in the sliding track (22). A limiting component (24) for positioning and fixing the reinforcing rib (4) is installed at the upper end of the sliding pillar (23). A spot welding component (25) for welding and fixing the inner door panel (3) and the reinforcing rib (4) is arranged on the limiting component (24); The clamping edge component (15) includes a fixed frame (151). Clamping plates (152) are symmetrically installed on the upper and lower inner walls of the upper part of the fixed frame (151). An air bag (153) is installed on the lower end surface of the upper clamping plate (152). A plurality of rollers (154) are rotatably embedded at the positions between the two clamping plates (152) on the left and right inner walls of the fixed frame (151); The fixed frame (151) and the clamping plates (152) are both in a C-shaped structure with the opening facing backward. Semi-circular protrusions (155) are arranged in the middle of the outer end surfaces of the fixed frame (151). Card position groups are evenly arranged on the conveyor belt of the conveyor (11); The limiting component (24) includes an L-shaped frame (241). The bottom of the vertical section of the L-shaped frame (241) is installed on the sliding pillar (23). Positioning plates (242) are symmetrically installed on the left and right end faces of the vertical section of the L-shaped frame (241) close to the card position group. An electric telescopic rod (243) is installed on the lower end surface of the horizontal section of the L-shaped frame (241). A cross plate (244) is installed at the telescopic end of the electric telescopic rod (243). Connecting rods (245) are installed at the positions close to the left and right sides of the lower end surface of the cross plate (244). A pressing plate (246) is jointly installed at the lower ends of the two connecting rods (245). A trapezoidal groove is opened at the position between the two connecting rods (245) at the lower end of the pressing plate (246). A stabilizing rib (247) is arranged between the connecting rod (245) and the pressing plate (246); A card position long hole is opened at the front part of the positioning plate (242). Stopping blocks (248) are installed on the opposite front faces of the front parts of the two positioning plates (242). A positioning groove is opened at the position corresponding to the pressing plate (246) on the upper end surface of the positioning plate (242). A support rod (249) is jointly connected to the lower end faces of the front parts of the two positioning plates (242); After the reinforcing rib (4) is placed on the inner door panel (3), the electric telescopic rod (243) above extends outwards, driving the transverse plate (244), the connecting rod (245) and the pressing plate (246) to move downwards. The pressing plate (246) moves downwards into the positioning groove to clamp and limit the position of the positioning plate (242). At the same time, the lower end of the pressing plate (246) presses tightly on the upper part of the reinforcing rib (4). The trapezoidal groove is matched with the structure of the reinforcing rib (4), and can also limit the front-back direction of the reinforcing rib (4) to a certain extent.

2. The spot welding robot for automotive parts according to claim 1, wherein: The cleaning assembly (14) includes a U-shaped plate (141) with an opening facing forward. Brush hairs (142) are uniformly arranged at the upper and lower ends inside the U-shaped plate (141), and the brush hairs (142) at the upper and lower positions are arranged in a staggered manner up and down. Suction holes (143) are uniformly formed at the positions between the brush hairs (142) at the upper and lower ends inside the U-shaped plate (141). A storage box (144) is detachably arranged at the position corresponding to the rear end face of the rear baffle (13) and the U-shaped plate (141). An air suction pump is installed on the storage box (144), and all the suction holes (143) are communicated with the storage box (144).

3. The spot welding robot for automobile parts according to claim 1, wherein: The clamping group is a plurality of clamping blocks (156) corresponding to the positions of the semi-circular protrusions (155) of the fixed frame (151), and semi-circular grooves are formed on the clamping blocks (156) to cooperate with the semi-circular protrusions (155) of the fixed frame (151).

4. A spot welding robot for automotive parts according to claim 1, characterized in that: The spot welding assembly (25) includes a telescopic cylinder (251). The vertical section of the L-shaped frame (241) is embedded with a telescopic cylinder (251) at the middle position between the two positioning plates (242). Support telescopic rods (252) are embedded on the left and right sides of the telescopic cylinder (251). A displacement box (253) is jointly installed on the telescopic ends of the telescopic cylinder (251) and the support telescopic rods (252). An installation groove is formed in the middle of the front end of the displacement box (253), and a transverse screw rod (254) is rotatably installed in the installation groove. One end of the transverse screw rod (254) extends outside the displacement box (253). An intermittent rotation motor (255) is installed on the displacement box (253) through a motor seat. The output shaft of the intermittent rotation motor (255) is connected to the transverse screw rod (254) extending outside the displacement box (253). An installation frame (256) is threadedly connected to the transverse screw rod (254), and the installation frame (256) is a U-shaped structure with an opening facing forward.

5. The spot welding robot for automotive parts according to claim 4, wherein: A limiting groove (257) is vertically opened on the front end face of the vertical section of the mounting bracket (256). Two sliding long blocks (258) are symmetrically and slidably arranged up and down in the limiting groove (257). A welding head (2520) is installed on the front side of the opposite faces of the two sliding long blocks (258). Linkage grooves (259) are opened at the positions on the left and right sides of the limiting groove (257) of the mounting bracket (256). Bidirectional threaded rods (2510) are rotatably installed in the linkage grooves (259). The upper ends of the bidirectional threaded rods (2510) all extend outside the mounting bracket (256). A rotary motor (2511) is installed on the mounting bracket (256) through a motor base. The upper end of one of the bidirectional threaded rods (2510) is connected to the output shaft of the rotary motor (2511). The outer walls of the two bidirectional threaded rods (2510) extending outside the mounting bracket (256) are connected through a pulley group (2512). Linkage blocks (2513) are symmetrically and threadedly connected to the outer walls of the bidirectional threaded rods (2510) up and down. A plurality of connecting strips (2514) are evenly arranged from front to back on the opposite faces of the adjacent linkage blocks (2513). Vertical through holes (2519) are opened at the positions corresponding to the side end faces of the sliding long blocks (258) and the connecting rods (245). The middle parts of the connecting strips (2514) are slidably arranged up and down in the vertical through holes (2519).

6. The spot welding robot for automotive parts according to claim 5, characterized in that: Spring telescopic rods (2515) are installed at the positions corresponding to the welding head (2520) on the upper and lower opposite faces of the linkage block (2513). The telescopic ends of the spring telescopic rods (2515) are installed with pressing plates (2516). The length dimension of the welding head (2520) is smaller than the length dimension of the spring telescopic rod (2515). A plurality of convex plates (2517) arranged from front to back are jointly installed on two adjacent linkage blocks (2513). Extrusion springs (2518) are installed at the protruding positions of the convex plates (2517). The other ends of the extrusion springs (2518) are installed on the sliding long blocks (258).

Images