Arc welding robot for automobile part manufacturing

Abstract

The invention belongs to the technical field of automobile part manufacturing, and particularly relates to an automobile part manufacturing arc welding robot which comprises a base, a welding table is rotatably connected to the top of the base, a positioning frame is fixedly connected to the top of the welding table, and a first clamping mechanism and two second clamping mechanisms are arranged on the positioning frame; the arranged first adjusting mechanism can drive the first clamping mechanism to rotate so as to adjust the silencer on the first clamping mechanism to rotate, and the arranged second adjusting mechanism can drive the second clamping mechanism to move so as to adjust the clamped exhaust pipe to move. The butt joint mechanism can drive the two second clamping mechanisms to move, so that the splicing angle of the automobile parts can be accurately adjusted according to actual requirements, flexibility and adjustability are achieved, and diversified welding requirements of exhaust pipe assemblies of different automobile types can be met.

Description

Technical Field

[0001] This invention belongs to the field of automotive parts manufacturing technology, specifically an arc welding robot for automotive parts manufacturing. Background Technology

[0002] In the automotive manufacturing industry, the assembly process of auto parts is crucial, with welding being one of the core steps. Many auto parts require precision welding to achieve a stable connection, thus constructing a fully functional overall vehicle structure. The exhaust pipe assembly, in particular, is a critical component. As an important part of the automotive exhaust system, it is mainly composed of exhaust pipes and a muffler, assembled through welding. The quality and complexity of this welding process directly impact the vehicle's performance and reliability.

[0003] With the rapid development of industrial automation technology, arc welding robots are gradually emerging in the field of automotive parts welding. Due to their advantages of high precision, high efficiency, and high stability, arc welding robots have become key equipment for improving the quality and production efficiency of automobile manufacturing. They can precisely control welding parameters, such as welding current, voltage, and welding speed, according to preset programs, achieving high-quality welding operations. At the same time, arc welding robots can work continuously for long periods, greatly improving production efficiency and reducing labor costs and the high dependence on worker skills.

[0004] A Chinese patent with announcement number CN204075464U discloses a robotic arc welding workstation for automotive mufflers. This workstation adopts a dual-station design, and the robot, in conjunction with an external axis coordinated flipping and positioning machine, can complete welding tasks in various positions. Because the workpiece has a circular arc weld, the workpiece position needs to be adjusted to a certain angle to ensure welding quality. Therefore, an external axis coordinated flipping and positioning machine is selected. According to the actual adjustment requirements, the weld is adjusted to the most suitable angle. By flipping at any angle, the weld position is changed to the optimal position. While ensuring welding quality, the welding process of the muffler is reduced, the welding quality of each position is relatively consistent and stable, the labor intensity is reduced, the welding process is reduced, and the workstation has the advantages of no missing parts, no missing welds, and consistent and stable product quality.

[0005] However, the practical application of arc welding robots to weld exhaust pipe assemblies faces numerous complex challenges. Because exhaust pipe assemblies must be precisely adapted to the unique structures of different vehicle models during installation, their shape and layout are not uniformly linear. In actual welding, multi-angle splicing and welding are often required to ensure a perfect fit to the vehicle's structure, achieving optimal exhaust performance and installation stability. However, existing splicing and assembly structures have significant limitations; their designs are relatively simple, lacking flexibility and adjustability. When splicing exhaust pipe assemblies at multiple angles, it is impossible to precisely adjust the splicing angles according to actual needs. This makes it difficult to meet the diverse welding requirements of exhaust pipe assemblies for different vehicle models. This not only affects welding quality and production efficiency but may also potentially impact the overall performance of the vehicle.

[0006] Therefore, the present invention provides an arc welding robot for manufacturing automotive parts. Summary of the Invention

[0007] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0008] The technical solution adopted by this invention to solve its technical problem is as follows: An arc welding robot for manufacturing automotive parts, comprising a base, a welding table on the top of the base, a positioning frame fixedly connected to the top of the welding table, a first clamping seat above the positioning frame, a first clamping mechanism on the first clamping seat, and second clamping seats above both ends of the positioning frame, each second clamping seat having a second clamping mechanism. Both the first and second clamping mechanisms are used to clamp and fix automotive parts. The first clamping mechanism includes two second clamping rollers and a first clamping... The first clamping roller is located between two second clamping rollers. The second clamping mechanism includes a clamping plate located inside the second clamping seat. An adjustment mechanism is provided on the positioning frame to drive the first clamping seat to rotate and adjust on the positioning frame. A docking mechanism is provided at the bottom of the positioning frame to drive the two second clamping seats to move in opposite directions. A positioning mechanism is provided at the bottom of the second clamping seat to adjust the lifting and displacement of the second clamping seat. A welding mechanism is provided on one side of the base to weld the assembled automotive parts.

[0009] Preferably, the adjustment mechanism includes a third servo motor and a tilting frame. The tilting frame is rotatably connected to the positioning frame via a shaft. The third servo motor is fixedly connected to the positioning frame. The output shaft of the third servo motor is fixedly connected to the shaft on the tilting frame. The first clamping seat is fixedly sleeved on the tilting frame.

[0010] Preferably, the docking mechanism includes a dual-axis motor and a first movable seat. The dual-axis motor is fixedly connected to the bottom of the positioning frame. Both output shafts of the dual-axis motor are fixedly connected to lead screws. Both ends of the positioning frame are provided with openings. A first guide rod is fixedly connected to the opening. There are two first movable seats, which are symmetrically connected to both ends of the positioning frame. The lead screw passes through the first movable seat and is threadedly engaged.

[0011] Preferably, the positioning mechanism includes a second linear motor and a first hydraulic cylinder, the first hydraulic cylinder being fixedly connected to a first movable seat, and the telescopic end of the first hydraulic cylinder being fixedly connected to a second clamping seat.

[0012] Preferably, the first clamping seat is provided with a push-pull mechanism for pulling two third hydraulic cylinders to rotate synchronously. The push-pull mechanism includes two second guide rods, which are respectively fixed on both sides of the first clamping seat. A second movable seat is slidably connected to the second guide rod, and a cantilever is rotatably connected to the second movable seat. The end of the cantilever away from the second movable seat is rotatably connected to a third hydraulic cylinder. A lifting frame is fixedly connected between the two second movable seats. A slot is formed at the center of the top of the first clamping seat, and a second servo motor is fixedly connected inside the slot. The output shaft of the second servo motor is fixedly connected to a screw. The screw passes through one end of the first clamping seat and is threaded into the lifting frame. The lifting frame is movably inserted inside the two tilting frames. Two push plates are symmetrically arranged inside the first clamping seat. The push plates are movably connected to the first clamping seat through a telescopic belt. A third guide rod is fixedly connected to one side of the push plate. A second spring is fixedly connected to one end of the third guide rod that passes through the first clamping seat. Two wedge-shaped frames are fixedly connected to the lifting frame. The first clamping seat is provided with two through holes. The wedge-shaped frames pass through the through holes and are wedge-shaped connected to the push plates.

[0013] Preferably, two first springs are fixedly connected inside the slot, one end of the two first springs is fixedly connected to a support plate, a first clamping roller is rotatably connected to the support plate, and the support plate is movably connected inside the slot.

[0014] Preferably, the inner wall of the slot is provided with a sliding groove, and the slider fixed on the first clamping roller slides within the sliding groove.

[0015] Preferably, the clamping end of the second clamping seat is provided with an arc-shaped groove, and a pressure sensor is provided at the center of the arc-shaped groove.

[0016] Preferably, the welding mechanism includes a first linear motor and an arc welding mechanism, wherein the first linear motor is fixedly connected to the rear side of the base, and the arc welding mechanism is fixedly connected to the slide of the first linear motor.

[0017] Preferably, the base further includes a reversing mechanism for driving the docking accessories to change direction by °. The reversing mechanism includes a first servo motor and a column. The first servo motor is fixedly connected inside the base. The output shaft of the first servo motor is fixedly connected to a second gear. The column is rotatably connected inside the base. One end of the column, which passes through the top of the base, is fixedly connected to a welding table. The other end of the column is fixedly connected to a first gear, which meshes with the second gear.

[0018] The beneficial effects of this invention are as follows: 1. The automotive parts manufacturing arc welding robot of the present invention, by setting a first clamping mechanism and a second clamping mechanism, can clamp and fix the muffler and exhaust pipe of the automotive parts respectively. The set docking mechanism can splice the two exhaust pipes to both ends of the muffler respectively, so that the welding mechanism can continuously weld the exhaust pipes at both ends of the muffler, thereby improving the welding efficiency of automotive parts. Secondly, the set adjustment mechanism can rotate and adjust the clamped muffler, so as to adjust the splicing angle of the muffler and exhaust pipe, which can meet the diverse welding needs of exhaust pipe assemblies of different models.

[0019] 2. The arc welding robot for automotive parts manufacturing described in this invention addresses the issue that, due to the cylindrical structure of the muffler and exhaust pipe, circumferential welding of the joint is required during the welding process. However, the welding mechanism's robotic arm cannot reach the back of the exhaust pipe assembly for welding. Typically, a semi-circular weld is required before repositioning and fixing the exhaust pipe assembly. This repositioning cannot ensure precise positioning of the back of the exhaust pipe assembly, leading to misalignment during welding and affecting the weld's sealing performance. Therefore, the reversing mechanism allows for the steering of the joined muffler and exhaust pipe, enabling precise adjustment and positioning, and improving the processing quality of the exhaust pipe assembly. Attached Figure Description

[0020] The invention will now be further described with reference to the accompanying drawings.

[0021] Figure 1 This is a perspective view of the present invention; Figure 2 This is a side view of the present invention; Figure 3 This is a cross-sectional view of the base in this invention; Figure 4 This is a schematic diagram showing the connection between the dual-axis motor and the second linear motor in this invention; Figure 5 This is a schematic diagram showing the connection between the positioning frame and the second clamping seat in this invention; Figure 6 This is a schematic diagram showing the connection between the positioning frame and the first clamping seat in this invention; Figure 7 This is the present invention. Figure 6 Enlarged view of A in the middle; Figure 8 This is a schematic diagram showing the connection between the first clamping seat and the first clamping roller in this invention.

[0022] In the diagram: 1. Base; 2. Welding table; 3. Positioning frame; 4. First clamping seat; 5. Second clamping seat; 6. First linear motor; 7. Arc welding mechanism; 8. Column; 9. First gear; 10. First servo motor; 11. Second gear; 12. First guide rod; 13. Dual-axis motor; 14. Lead screw; 15. First movable seat; 16. Second linear motor; 17. First hydraulic cylinder; 18. Second hydraulic cylinder; 19. Clamping plate; 20. First clamping roller; 21. Third hydraulic cylinder; 22. Second clamping roller; 23. First spring; 24. Groove; 25. Second servo motor; 26. Screw; 27. Lifting frame; 28. Second movable seat; 29. ​​Second guide rod; 30. Cantilever; 31. Third servo motor; 32. Tilting frame; 33. Support plate; 34. Push plate; 35. Wedge frame; 36. Third guide rod; 37. Second spring. Detailed Implementation

[0023] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0024] like Figures 1 to 8 As shown in the embodiment of the present invention, an arc welding robot for manufacturing automotive parts includes a base. A welding table 2 is mounted on the top of the base 1. A positioning frame 3 is fixedly connected to the top of the welding table 2. A first clamping seat 4 is mounted above the positioning frame 3, and a first clamping mechanism is mounted on the first clamping seat 4. Second clamping seats 5 are mounted above both ends of the positioning frame 3, and second clamping mechanisms are mounted on the second clamping seats 5. Both the first and second clamping mechanisms are used to clamp and fix the automotive parts. The first clamping mechanism includes two second clamping rollers 22 and a first clamping roller 20. 20 is located between two second clamping rollers 22. The second clamping mechanism includes a clamping plate 19, which is located inside the second clamping seat 5. An adjustment mechanism is provided on the positioning frame 3. The adjustment mechanism is used to drive the first clamping seat 4 to rotate and adjust on the positioning frame 3. A docking mechanism is provided at the bottom of the positioning frame 3. The docking mechanism is used to drive the two second clamping seats 5 to move in opposite directions. A positioning mechanism is provided at the bottom of the second clamping seat 5. The positioning mechanism is used to adjust the lifting and displacement of the second clamping seat 5. A welding mechanism is provided on one side of the base 1. The welding mechanism is used to weld the spliced ​​automotive parts. During operation, this application is mainly used for clamping and welding cylindrical mufflers and exhaust pipes. Careful grinding of the weld joints between the muffler and exhaust pipe is a crucial step. Through meticulous grinding, the weld joints of the muffler and exhaust pipe can be perfectly aligned at the installation angle, laying a solid foundation for subsequent precise welding. After the muffler and exhaust pipe are prepared, they are then spliced ​​and welded. First, the muffler is placed on the first clamping seat 4. The muffler is clamped and fixed by opening the first clamping mechanism on the first clamping seat 4. Then, the two exhaust pipes are placed on the two second clamping seats 5 respectively. The second clamping mechanism on the second clamping seat 5 can clamp and fix the exhaust pipes. Then, the positioning mechanism is opened. The positioning mechanism drives the clamped exhaust pipes to move up and down and back and forth, so that the two exhaust pipes can be adjusted to align with the inlet and outlet of the muffler. Then, the docking mechanism is opened to drive the two clamped exhaust pipes to move simultaneously towards the muffler until the two exhaust pipes are spliced ​​on the muffler. Finally, the welding mechanism is opened to weld the joint between the muffler and the exhaust pipes. The arc welding mechanism 7 is mainly composed of a six-axis robot, welding gun, power supply equipment, control box and other core parts to realize the welding operation. The arc welding mechanism 7 is an existing technology structure, so it is not described in detail in this article. During the horizontal docking of the muffler and exhaust pipe, the docking mechanism simultaneously drives the two clamped exhaust pipes to move towards the muffler until one of the exhaust pipes docks onto the muffler. At this point, the exhaust pipe continues to move with the docking mechanism. Since the first clamping mechanism uses the second clamping roller 22 and the first clamping roller 20 to press against the outer surface of the muffler, the muffler can be moved under the action of external force until the other exhaust pipe docks onto the other end of the muffler. At this point, the docking mechanism can be stopped, which facilitates the docking of the two exhaust pipes with the muffler at one time. This allows the welding mechanism to continuously weld the exhaust pipes on both ends of the muffler, improving the efficiency of the welding process. Because the exhaust system assembly needs to be fitted to the car body shape, the muffler and exhaust pipe will be installed at a certain angle. Therefore, when adjusting the angle between the muffler and exhaust pipe for welding, it is necessary to adjust the joint angle between them. First, the muffler is horizontally clamped on the first clamping seat 4, and the two exhaust pipes are clamped on the two second clamping seats 5 respectively. The docking mechanism is then opened to allow the exhaust pipes and muffler to make their first joint. After the first joint, the muffler will be centered at the joint end of the two exhaust pipes. Then, the joint... The mechanism drives the two exhaust pipes to detach from the muffler, and then drives the clamped muffler to rotate by opening the adjustment mechanism. After rotating to the required docking angle, the two exhaust pipes are repositioned and aligned with the muffler by the positioning mechanism. After positioning, the two exhaust pipes are simultaneously spliced ​​onto both ends of the muffler by the docking mechanism. At this time, the muffler and exhaust pipes can be welded at a certain angle. It should be noted that if the muffler only needs to be spliced ​​and welded at a certain angle in one direction, the splicing and welding in one direction can be carried out first. After the welding is completed, the other end of the muffler can be spliced ​​in one direction. The above allows for adjustment of the splicing angle of automotive parts according to actual needs, making welding more flexible and improving welding efficiency.

[0025] like Figure 6 As shown, the above-mentioned adjustment mechanism includes a third servo motor 31 and a tilting frame 32. The tilting frame 32 is rotatably connected to the positioning frame 3 via a shaft. The third servo motor 31 is fixedly connected to the positioning frame 3. The output shaft of the third servo motor 31 is fixedly connected to the shaft on the tilting frame 32. The first clamping seat 4 is fixedly sleeved on the tilting frame 32. During operation, the third servo motor 31 drives the connected tilting frame 32 to rotate on the positioning frame 3. Since the first clamping seat 4 is fixedly sleeved on the tilting frame 32, the third servo motor 31 can drive the first clamping seat 4 to rotate on the positioning frame 3. Furthermore, since the muffler in the automotive parts is fixedly clamped on the first clamping seat 4, when the bottom of the muffler is attached to the outer surface of the first clamping seat 4 for clamping, the friction between the first clamping seat 4 and the muffler is increased. This prevents the muffler from sliding down due to its own weight after the first clamping seat 4 is rotated and tilted, thus enabling the first clamping seat 4 to rotate and adjust the clamped muffler. To further explain, the third servo motor 31 can control the first clamping seat 4 to rotate clockwise and counterclockwise, and the rotation angle range is 0-120°.

[0026] like Figure 4As shown, the docking mechanism includes a dual-axis motor 13 and a first movable seat 15. The dual-axis motor 13 is fixedly connected to the bottom of the positioning frame 3. The output shafts at both ends of the dual-axis motor 13 are fixedly connected to lead screws 14. Both ends of the positioning frame 3 are provided with openings, and a first guide rod 12 is fixedly connected inside the openings. There are two first movable seats 15, which are symmetrically connected to both ends of the positioning frame 3. The lead screw 14 passes through the first movable seat 15 and is threadedly engaged. During operation, turning on the dual-axis motor 13 drives the two first movable seats 15 to move synchronously in opposite directions. That is, the dual-axis motor 13 can simultaneously drive the lead screws 14 at both ends to rotate. Since the two lead screws 14 are respectively connected to the two first movable seats 15 at both ends of the positioning frame 3, and the lead screws 14 are threadedly engaged with the first movable seats 15, and since the first movable seats 15 are limited to slide on the first guide rod 12, the rotating lead screws 14 can drive the first movable seats 15 to move laterally on the positioning frame 3. The displaced first movable seats 15 can drive the second clamping seat 5 connected above to move, and the second clamping seat 5 drives the clamped exhaust pipe to move, so that the exhaust pipe can approach the muffler for docking.

[0027] like Figure 5 As shown, the positioning mechanism includes a second linear motor 16 and a first hydraulic cylinder 17. The first hydraulic cylinder 17 is fixedly connected to the first movable seat 15, and the telescopic end of the first hydraulic cylinder 17 is fixedly connected to the second clamping seat 5. During operation, opening the second linear motor 16 can drive the fixed first hydraulic cylinder 17 to move back and forth. Opening the first hydraulic cylinder 17 drives the connected second clamping seat 5 to rise and fall. The exhaust pipe in the automotive parts is fixedly clamped on the second clamping seat 5. The back and forth movement and the rising and falling movement can position and align the exhaust pipe with the muffler interface, making it easy for the exhaust pipe and muffler to be aligned and spliced.

[0028] like Figure 6 , Figure 7 and Figure 8As shown, the first clamping seat 4 is equipped with a push-pull mechanism for pulling two third hydraulic cylinders 21 to rotate synchronously. The push-pull mechanism includes two second guide rods 29, which are respectively fixed on both sides of the first clamping seat 4. A second movable seat 28 is slidably connected to the second guide rod 29, and a cantilever 30 is rotatably connected to the second movable seat 28. The end of the cantilever 30 away from the second movable seat 28 is rotatably connected to the third hydraulic cylinder 21. A lifting frame 27 is fixedly connected between the two second movable seats 28. A slot 24 is opened at the center of the top of the first clamping seat 4, and a second servo motor 25 is fixedly connected inside the slot 24. The output shaft of the service motor 25 is fixedly connected to a screw 26. The screw 26 passes through one end of the first clamping seat 4 and is threadedly engaged with the lifting frame 27. The lifting frame 27 is movably inserted inside the two flipping frames 32. Two push plates 34 are symmetrically arranged inside the first clamping seat 4. The push plates 34 are movably connected to the first clamping seat 4 through a telescopic belt. A third guide rod 36 is fixedly connected to one side of the push plate 34. A second spring 37 is fixedly connected to one end of the third guide rod 36 that passes through the first clamping seat 4. Two wedge-shaped frames 35 are fixedly connected to the lifting frame 27. Two through holes are provided on the first clamping seat 4. The wedge-shaped frames 35 pass through the through holes and are wedge-shaped connected to the push plates 34. During operation, before starting, the two third hydraulic cylinders 21 are stationary. The first clamping seat 4 is securely installed in its predetermined position, and the two second guide rods 29 are vertically and firmly fixed on both sides of the first clamping seat 4, acting like two solid pillars to provide a stable support track for the subsequent sliding components. The second movable seat 28 is fitted onto the second guide rods 29, and is in its initial position, before any slippage occurs. One end of the cantilever 30 is connected to the second movable seat 28 via a rotating connector, while the other end is rotatably connected to the third hydraulic cylinder 21, forming a flexible connection structure. The lifting frame 27 is horizontally fixed between the two second movable seats 28, connecting them into a whole and enhancing the stability of the structure. Inside the slot 24, the second servo motor 25 is installed, and its output shaft is tightly connected to the screw 26. One end of the screw 26 passes through the first clamping seat 4 and is in a ready-to-thread engagement state with the lifting frame 27. The lifting frame 27 can also be moved and inserted into the interior of the two tilting frames 32, preparing for the subsequent synchronous rotation action.

[0029] When it is necessary to pull the two third hydraulic cylinders 21 to rotate synchronously, the second servo motor 25 is started first. The output shaft of the second servo motor 25 begins to rotate, driving the screw 26 fixedly connected to it to rotate synchronously. Since the screw 26 and the lifting frame 27 are connected by a threaded engagement, when the screw 26 rotates, according to the principle of threaded transmission, the lifting frame 27 will generate linear motion along the axial direction of the screw 26. If the second servo motor 25 rotates forward, the lifting frame 27 will move upward along the screw 26; if the second servo motor 25 rotates in reverse, the lifting frame 27 will move downward along the screw 26. During the movement, the lifting frame 27 will drive the two second movable seats 28 fixedly connected to it to slide synchronously on the second guide rod 29. The second guide rod 29 provides precise guidance for the sliding of the second movable seats 28, ensuring that the second movable seats 28 can move smoothly along the predetermined linear trajectory without deviation or jamming. As the second movable seats 28 slide, the cantilever 30 rotatably connected to the second movable seats 28 will rotate. The cantilever 30 acts like a flexible lever; one end changes position as the second movable seat 28 moves, while the other end drives the connected third hydraulic cylinder 21 to move. Due to the rotation of the cantilever 30, the position and angle of the third hydraulic cylinder 21 change, gradually deviating from its initial position. Driven by the cantilever 30, the two third hydraulic cylinders 21 rotate synchronously around their respective axes of rotation. The rotated third hydraulic cylinder 21 can adjust the direction of the second clamping roller 22 clamping the surface of the muffler. During the adjustment of the rotation of the third hydraulic cylinder 21, the lifting frame 27 will pull the wedge frame 35 to rise and fall at the same time. That is, the lifting frame 27 will drive the connected wedge frame 35 to rise and fall. When the wedge frame 35 rises, due to the wedge-shaped engagement between the wedge frame 35 and the push plate 34, and the lateral displacement of the third guide rod 36 fixed to the push plate 34 on the first clamping seat 4, the wedge frame 35 pushes the push plate 34 to move in the direction of the first clamping roller 20. The displaced push plate 34 drives the third guide rod 36 to compress the second spring 37. When the wedge frame 35 falls, the push plate 34 disengages from the wedge. When the frame 35 is squeezed, the compressed second spring 37 will reset, thereby causing the third guide rod 36 to pull the connected push plate 34 to reset. Thus, when the third hydraulic cylinder 21 is adjusted to rotate and clamp the small-diameter muffler, the push plate 34 will push and prevent the small-diameter muffler on the first clamping seat 4 from being centered on the first clamping roller 20. This makes it easy for the small-diameter muffler to be centered between the two second clamping rollers 22. This can be adjusted according to the size of the muffler diameter, avoiding the situation where the muffler diameter is too small and the horizontally clamping second clamping rollers 22 cannot fit against the muffler surface for clamping. This method can be used to clamp and fix mufflers of different diameters.

[0030] Once the third hydraulic cylinder 21 rotates to the desired angle, the second servo motor 25 stops operating, and the entire push-pull mechanism temporarily comes to a standstill, maintaining the current angle of the third hydraulic cylinder 21 to facilitate subsequent clamping, splicing, and welding operations. If it is necessary to return to the initial state, simply start the second servo motor 25 in reverse, following the reverse process described above, to return the lifting frame 27, the second movable seat 28, the cantilever 30, and the third hydraulic cylinder 21 to their initial positions sequentially, preparing for the next operation.

[0031] like Figure 8 As shown, two first springs 23 are fixedly connected inside the slot 24. One end of the two first springs 23 is fixedly connected to the support plate 33. The first clamping roller 20 is rotatably connected to the support plate 33. The support plate is movably connected inside the slot 24. The inner wall of the slot 24 is provided with a sliding groove, and the slider fixed on the first clamping roller 20 slides within the sliding groove. During operation, in the precision clamping process of automotive parts, the muffler to be clamped is first placed on the first clamping roller 20, at which time the first clamping roller 20 bears the weight of the muffler.

[0032] When entering the pre-clamping stage, the third hydraulic cylinder 21 slowly pushes the second clamping roller 22 closer to the outer surface of the muffler until the second clamping roller 22 is in contact with the upper half of the outer surface of the muffler. At this time, the first clamping roller 20 is supported on the lower half of the muffler. The two second clamping rollers 22 and the first clamping roller 20 clamp the muffler from three directions. During the clamping process, the support plate 33 connected to the first clamping roller 20 applies pressure to the first spring 23 at the bottom. Under the pressure, the first spring 23 undergoes slight deformation. At the same time, a certain gap is left between the automotive parts and the first clamping seat 4, so that the muffler has a buffering effect when clamped. Under the pressure of external force, the clamped muffler can move between the second clamping roller 22 and the first clamping roller 20, so that the two exhaust pipes can be connected to the muffler in sequence during the splicing process.

[0033] After the exhaust pipe is connected to the muffler, the second clamping roller 22 continuously applies pressure to the muffler until the muffler pushes the first clamping roller 20 to slowly retract into the slot 24 under pressure. As the first clamping roller 20 retracts, the bottom of the muffler gradually fits against the first clamping seat 4. At this time, the two second clamping rollers 22, together with the first clamping seat 4, clamp the muffler in the middle for fixation, thus forming a rigid clamp on the automotive parts. After rigid clamping, there will be slight misalignment between the muffler and the exhaust pipe, which can be re-aligned and spliced ​​by the positioning mechanism.

[0034] Furthermore, when the first clamping roller 20 retracts into the slot 24, the slider and the groove on the inner wall of the slot 24 achieve a limiting engagement. This engagement allows the first clamping roller 20 to move up and down stably without wobbling or shifting, ensuring the stability of the clamping process.

[0035] Once the second clamping roller 22 has completed its clamping task and is no longer pressing on the automotive parts, the first spring 23, using its elasticity, pushes the first clamping roller 20 connected to the support plate 33 to reset. Under the action of the first spring 23, the first clamping roller 20 quickly returns to its initial position, preparing for the next clamping operation.

[0036] like Figure 5 As shown, the clamping end of the second clamping seat 5 is provided with an arc-shaped groove, and a pressure sensor is provided at the center of the arc-shaped groove. During operation, the clamping end of the second clamping seat 5 features an arc-shaped groove design, providing precise and reliable limiting support for the tubular fitting and preventing it from rolling off before clamping. Inside the arc-shaped groove, a pressure sensor can detect the pressure exerted on the fitting in real time and accurately. This meticulous detection mechanism effectively prevents irreversible deformation of the fitting caused by excessive clamping pressure, ensuring that the tubular fitting maintains its original shape and performance throughout the processing.

[0037] like Figure 1 and 2 As shown, the above welding mechanism includes a first linear motor 6 and an arc welding mechanism 7. The first linear motor 6 is fixedly connected to the rear side of the base 1, and the arc welding mechanism 7 is fixedly connected to the slide of the first linear motor 6. During operation, firstly, the first linear motor 6 is turned on, driving the arc welding mechanism 7 to move smoothly along a straight line. The welding head on the arc welding mechanism 7 performs a semi-circular weld on one end of the muffler. Next, the arc welding mechanism 7 is driven to quickly move to the other end of the muffler, performing a semi-circular weld there as well. Then, the reversing mechanism is activated to reverse the direction of the muffler. At this point, the arc welding mechanism 7 is used again to weld the other semi-circle of the weld joint, thus completing the entire welding process.

[0038] like Figure 1 and Figure 3 As shown, the base 1 also includes a reversing mechanism for driving the docking accessories to reverse 180°. The reversing mechanism includes a first servo motor 10 and a column 8. The first servo motor 10 is fixedly connected inside the base 1. The output shaft of the first servo motor 10 is fixedly connected to a second gear 11. The column 8 is rotatably connected inside the base 1. One end of the column 8 that passes through the top of the base 1 is fixedly connected to the welding table 2. The other end of the column 8 is fixedly connected to a first gear 9. The first gear 9 and the second gear 11 are meshed together. During operation, in the reversing phase, the first servo motor 10 is activated, driving the second gear 11 to rotate. The second gear 11 and the first gear 9 are meshed together. The first gear 9 is securely fixed to the column 8, which is mounted on the base 1 via a precision bearing structure, allowing for flexible rotation. When the second gear 11 rotates, it transmits power to the column 8 through meshing with the first gear 9, causing the column 8 to rotate smoothly on the base 1. The column 8 is cleverly designed to pass through the structure of the base 1, and during rotation, it drives the welding table 2 fixed on it to rotate as well. The automotive parts are already precisely positioned and firmly clamped above the welding table 2. As the welding table 2 rotates, the automotive parts also rotate in a ring. This allows for the steering of the assembled muffler and exhaust pipe, enabling precise adjustment and positioning, and improving the quality of the exhaust pipe assembly processing.

[0039] Work process: First, the muffler is placed on the first clamping seat 4. The muffler is clamped and fixed by opening the first clamping mechanism on the first clamping seat 4. Then, the two exhaust pipes are placed on the two second clamping seats 5 respectively. The second clamping mechanism on the second clamping seat 5 can clamp and fix the exhaust pipes. Then, the positioning mechanism is opened. The positioning mechanism drives the clamped exhaust pipes to move up and down and back and forth, so that the two exhaust pipes can be adjusted to align with the inlet and outlet of the muffler. Then, the docking mechanism is opened to drive the two clamped exhaust pipes to move simultaneously towards the muffler until the two exhaust pipes are spliced ​​on the muffler and stop. Finally, the welding mechanism is opened to weld the joint between the muffler and the exhaust pipes. During the horizontal docking of the muffler and exhaust pipe, the docking mechanism simultaneously drives the two clamped exhaust pipes to move towards the muffler until one of the exhaust pipes docks onto the muffler. At this point, the exhaust pipe continues to move with the operation of the docking mechanism. Since the first clamping mechanism uses the second clamping roller 22 and the first clamping roller 20 to press against the outer surface of the muffler for clamping, the muffler can be moved under the action of external force until the other exhaust pipe docks onto the other end of the muffler. At this point, the operation of the docking mechanism can be stopped, which facilitates the docking of the two exhaust pipes with the muffler at one time, and makes it convenient for the welding mechanism to continuously weld the exhaust pipes on both ends of the muffler. Because the exhaust system assembly needs to be fitted to the car body shape, the muffler and exhaust pipe will be installed at a certain angle. Therefore, when adjusting the angle between the muffler and exhaust pipe for welding, it is necessary to adjust the joint angle between them. First, the muffler is horizontally clamped on the first clamping seat 4, and the two exhaust pipes are clamped on the two second clamping seats 5 respectively. The docking mechanism is then opened to allow the exhaust pipes and muffler to make their first joint. After the first joint, the muffler will be centered at the joint end of the two exhaust pipes. Then, the joint... The mechanism drives the two exhaust pipes to detach from the muffler, and then drives the clamped muffler to rotate by opening the adjustment mechanism. After rotating to the required docking angle, the two exhaust pipes are repositioned and aligned with the muffler by the positioning mechanism. After positioning, the two exhaust pipes are simultaneously spliced ​​onto both ends of the muffler by the docking mechanism. At this time, the muffler and exhaust pipes can be welded at a certain angle. It should be noted that if the muffler only needs to be spliced ​​and welded at a certain angle in one direction, the splicing and welding in one direction can be carried out first. After the welding is completed, the other end of the muffler can be spliced ​​in one direction. By turning on the third servo motor 31, the connected flipping frame 32 can be driven to rotate on the positioning frame 3. Since the first clamping seat 4 is fixedly sleeved on the flipping frame 32, the third servo motor 31 can drive the first clamping seat 4 to rotate on the positioning frame 3. Since the muffler in the automotive parts is fixedly clamped on the first clamping seat 4, the first clamping seat 4 can drive the clamped muffler to rotate. To further explain, the third servo motor 31 can control the first clamping seat 4 to rotate clockwise and counterclockwise. By turning on the dual-axis motor 13, the two first movable seats 15 can be driven to move synchronously in opposite directions. That is, the dual-axis motor 13 can simultaneously drive the lead screws 14 at both ends to rotate. Since the two lead screws 14 are respectively connected to the two first movable seats 15 at both ends of the positioning frame 3, and the lead screws 14 are threadedly engaged with the first movable seats 15, and since the first movable seats 15 are limited to slide on the first guide rod 12, the rotating lead screws 14 can drive the first movable seats 15 to move laterally on the positioning frame 3. The displaced first movable seats 15 can drive the second clamping seat 5 connected above to move, and the second clamping seat 5 drives the clamped exhaust pipe to move, so that the exhaust pipe can approach the muffler for docking. By opening the second linear motor 16, the fixed first hydraulic cylinder 17 can be moved back and forth. By opening the first hydraulic cylinder 17, the connected second clamping seat 5 can be raised and lowered. The exhaust pipe in the automotive parts is fixedly clamped on the second clamping seat 5. The back and forth movement and the raising and lowering movement can make the exhaust pipe and the muffler interface positioned and aligned, which is convenient for the exhaust pipe and the muffler to be aligned and spliced. The first linear motor 6 is turned on, driving the arc welding mechanism 7 to move smoothly along a straight line. The welding head on the arc welding mechanism 7 performs a semi-circular weld on one end of the muffler. Then, the arc welding mechanism 7 is driven to quickly move to the other end of the muffler, and the same semi-circular weld is performed. Then, the reversing mechanism is activated to reverse the direction of the muffler. At this time, the arc welding mechanism 7 is used again to weld the other semi-circle of the weld area. At this point, the entire welding process is completed.

[0040] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An arc welding robot for manufacturing automotive parts, characterized in that: The system includes a base, a welding platform on top of the base, a positioning frame fixedly connected to the top of the welding platform, a first clamping seat above the positioning frame, a first clamping mechanism on the first clamping seat, and second clamping seats above both ends of the positioning frame, each with a second clamping mechanism. Both the first and second clamping mechanisms are used to clamp and fix automotive parts. The first clamping mechanism includes two second clamping rollers and a first clamping roller, with the first clamping roller located between the two second clamping rollers. The second clamping mechanism includes a clamping plate located inside the second clamping seat. An adjustment mechanism is provided on the positioning frame to drive the first clamping seat to rotate and adjust on the positioning frame. A docking mechanism is provided at the bottom of the positioning frame to drive the two second clamping seats to move in opposite directions. A positioning mechanism is provided at the bottom of the second clamping seat to adjust the lifting and displacement of the second clamping seat. A welding mechanism is provided on one side of the base to weld the assembled automotive parts.

2. The arc welding robot for automotive parts manufacturing according to claim 1, characterized in that: The adjustment mechanism includes a third servo motor and a tilting frame. The tilting frame is rotatably connected to the positioning frame via a shaft. The third servo motor is fixedly connected to the positioning frame. The output shaft of the third servo motor is fixedly connected to the shaft on the tilting frame. The first clamping seat is fixedly sleeved on the tilting frame.

3. The arc welding robot for manufacturing automotive parts according to claim 2, characterized in that: The docking mechanism includes a dual-axis motor and a first movable seat. The dual-axis motor is fixedly connected to the bottom of the positioning frame. Both output shafts of the dual-axis motor are fixedly connected to lead screws. Both ends of the positioning frame are provided with openings. A first guide rod is fixedly connected in the opening. There are two first movable seats, which are symmetrically connected to both ends of the positioning frame. The lead screw passes through the first movable seat and is threadedly engaged.

4. The arc welding robot for manufacturing automotive parts according to claim 3, characterized in that: The positioning mechanism includes a second linear motor and a first hydraulic cylinder. The first hydraulic cylinder is fixedly connected to a first movable seat, and the telescopic end of the first hydraulic cylinder is fixedly connected to a second clamping seat.

5. The arc welding robot for manufacturing automotive parts according to claim 4, characterized in that: The first clamping seat is equipped with a push-pull mechanism for pulling two third hydraulic cylinders to rotate synchronously. The push-pull mechanism includes two second guide rods, which are respectively fixed on both sides of the first clamping seat. A second movable seat is slidably connected to the second guide rod, and a cantilever is rotatably connected to the second movable seat. The end of the cantilever away from the second movable seat is rotatably connected to the third hydraulic cylinder. A lifting frame is fixedly connected between the two second movable seats. A slot is opened at the center of the top of the first clamping seat. A second servo motor is fixedly connected inside the slot. A screw is fixedly connected to the output shaft of the second servo motor. The screw passes through one end of the first clamping seat and is threaded into the lifting frame. The lifting frame is movably inserted inside the two flipping frames. Two push plates are symmetrically arranged inside the first clamping seat. The push plates are movably connected to the first clamping seat through a telescopic belt. A third guide rod is fixedly connected to one side of the push plate. A second spring is fixedly connected to one end of the third guide rod that passes through the first clamping seat. Two wedge-shaped frames are fixedly connected to the lifting frame. The first clamping seat is provided with two through holes. The wedge-shaped frames pass through the through holes and are wedge-shaped connected to the push plates.

6. The arc welding robot for manufacturing automotive parts according to claim 5, characterized in that: Two first springs are fixedly connected inside the slot. One end of each of the two first springs is fixedly connected to a support plate. A first clamping roller is rotatably connected to the support plate, and the support plate is movably connected inside the slot.

7. The arc welding robot for manufacturing automotive parts according to claim 6, characterized in that: The inner wall of the slot is provided with a sliding groove, and the slider fixed on the first clamping roller slides within the sliding groove.

8. The arc welding robot for manufacturing automotive parts according to claim 7, characterized in that: The clamping end of the second clamping seat is provided with an arc-shaped groove, and a pressure sensor is provided at the center of the arc-shaped groove.

9. The arc welding robot for manufacturing automotive parts according to claim 8, characterized in that: The welding mechanism includes a first linear motor and an arc welding mechanism. The first linear motor is fixedly connected to the rear side of the base, and the arc welding mechanism is fixedly connected to the slide of the first linear motor.

10. The arc welding robot for manufacturing automotive parts according to claim 1, characterized in that: The base also includes a reversing mechanism for driving the docking accessories to perform a 180° reversal. The reversing mechanism includes a first servo motor and a column. The first servo motor is fixedly connected inside the base. The output shaft of the first servo motor is fixedly connected to a second gear. The column is rotatably connected inside the base. One end of the column, which passes through the top of the base, is fixedly connected to a welding table. The other end of the column is fixedly connected to a first gear, which meshes with the second gear.

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