An integrated laser welding device for automobile exhaust pipe

Abstract

The application discloses a kind of automobile exhaust pipe integration laser welding device, belong to exhaust pipe welding technical field, including rack, still include: rotary feeding device, multi-station processing device and product detection device, the rotary feeding device of two exhaust pipe parts is positioned and fed in advance and is installed in the front side of the rack, the multi-station processing device is installed on the rack, and the exhaust pipe part is accurately positioned and fixed and is welded to unload, product detection device is installed in the side of the rack, and the exhaust pipe after welding on multi-station processing device is continuously airtightness detection and leak point marking is carried out.

Description

Technical Field

[0001] This invention relates to the field of exhaust pipe welding technology, specifically an integrated laser welding device for automotive exhaust pipes. Background Technology

[0002] The automotive exhaust pipe is a core component of the automotive exhaust system. It is composed of multiple pipe modules welded together, with numerous weld seams and a large proportion of circumferential weld seams. After two exhaust pipe parts are welded, the weld seams need to be tested for sealing before the next welding step can be performed. Currently, most mainstream exhaust pipe welding equipment on the market adopts a single-process independent layout mode, with workstations such as loading, positioning, welding, quality inspection, and sorting being separated. Workpieces need to be transferred between different equipment by transfer robots or conveyor lines. There is a lot of waiting time and ineffective movement in the process connection. Moreover, the existing clamping mechanisms are mostly fixed structures, which have poor compatibility with exhaust pipes of different diameters and lengths. When switching specifications, the clamps need to be manually adjusted repeatedly, resulting in a long adjustment cycle. This further exacerbates the difference in welding quality between different batches of products and affects product quality.

[0003] Chinese patent CN121104321A discloses a welding platform for automotive exhaust pipes, comprising a processing table, a laser welding device mounted on the center of the top surface of the processing table via a lifting frame, mounting plates symmetrically slidably connected to the left and right sides of the processing table, the two mounting plates being moved away from or close to each other via a linear module, a clamping assembly for holding the automotive exhaust pipe being provided on the side of the two mounting plates that are close to each other, and a cleaning assembly connected to one of the mounting plates via a moving assembly; the cleaning assembly includes a processing box fixed to the moving assembly, the processing box having a telescopic component circumferentially arranged thereon, one end of the telescopic component being connected to The device includes a brush and a polishing component, which are spaced apart. A suction port is circumferentially arranged in the processing box, and a suction component is installed at the suction port. The clamping assembly includes a first disc rotatably connected to a mounting plate, a first gear ring fixed to the outer wall of the first disc, a first gear meshing with the first gear ring rotatably connected to the mounting plate, and the first gear being driven to rotate by a first drive motor. A second disc is rotatably connected to the first disc, a second gear ring fixed to the outer wall of the second disc, and a second gear meshing with the second gear ring rotatably connected to the first disc, and the second gear being driven to rotate by a second drive motor.

[0004] However, the technical solution of this patent has the following problems: This patent cannot perform continuous positioning welding and automatic sorting and unloading of exhaust pipes of various sizes, resulting in low production efficiency.

[0005] Based on this, the present invention designs an integrated laser welding device for automotive exhaust pipes to solve the above problems. Summary of the Invention

[0006] In view of the above-mentioned shortcomings of the existing technology, the present invention provides an integrated laser welding device for automobile exhaust pipes.

[0007] To achieve the above objectives, the present invention provides the following technical solution: An integrated laser welding device for automotive exhaust pipes includes a frame, a rotary loading device, a multi-station processing device, and a product inspection device. The rotary loading device is installed on the front side of the frame for pre-positioning and loading two exhaust pipe parts. The multi-station processing device is installed on the frame for precisely positioning, fixing, and welding the exhaust pipe parts. The product inspection device is installed on one side of the frame for continuous airtightness testing and leak point marking of the exhaust pipes welded on the multi-station processing device. The multi-station processing device includes: a multi-station switching component, a centering and positioning clamping component, a sorting and unloading component, and a laser welding component. The multi-station switching component is mounted on the frame to realize intermittent switching between different stations. Multiple centering and positioning clamping components are mounted on the multi-station switching component to accurately position and center-clamp the exhaust pipe parts. The sorting and unloading component is mounted on the frame to sort and unload qualified and unqualified exhaust pipes from the centering and positioning clamping components. The laser welding component is mounted on the frame and is used to weld the exhaust pipe parts clamped by the centering and positioning clamping components.

[0008] Furthermore, the multi-station switching component includes: an electric slip ring, a square rotary table, and a first electric rotary worktable. The fixed ends of the two electric slip rings are fixedly installed on the left and right sides of the frame. The left and right sides of the square rotary table are respectively fixedly connected to the rotating ends of the two electric slip rings. The first electric rotary worktable is fixedly installed on one side of the frame, and the output end of the first electric rotary worktable is fixedly connected to the rotating end of one of the electric slip rings.

[0009] Furthermore, the centering and positioning clamping assembly includes: a first linear module, a hollow electric chuck, a drive motor, a drive gear, and a driven gear. Two first linear modules are symmetrically fixedly mounted on one side of a square rotary table. The hollow electric chuck is rotatably connected to the output end of the first linear module. The drive motor is fixedly mounted on the output end of the first linear module. The drive gear is fixedly mounted on the output shaft of the drive motor. The driven gear is fixedly mounted on one side of the hollow electric chuck. The driven gear and the drive gear mesh with each other.

[0010] Furthermore, the sorting and feeding assembly includes: a belt conveyor, a fixed frame, a sliding frame, and cylinders. The outer shell of the belt conveyor is fixedly installed on the lower side of the frame, the fixed frame is fixedly installed on one side of the frame, the sliding frame is slidably connected to the fixed frame, the outer shells of the two cylinders are fixedly installed on the fixed frame, and the output end of the cylinder is fixedly connected to the sliding frame.

[0011] Furthermore, the laser welding assembly includes: a second linear module, a third linear module, and a laser welding head. The second linear module is fixedly mounted on the frame, the third linear module is fixedly mounted on the output end of the second linear module, and the laser welding head is fixedly connected to the output end of the third linear module.

[0012] Furthermore, the rotary feeding device includes a rotary assembly and a pre-alignment assembly. The rotary assembly is mounted on the front side of the frame, and multiple pre-alignment assemblies are mounted on the output end of the rotary assembly.

[0013] Furthermore, the rotating assembly includes: a second electric rotary table and a rotating rod. The second electric rotary table is fixedly installed on the front side of the frame. The rotating rod is rotatably connected to the frame via a rotating shaft. One end of the rotating shaft of the rotating rod is fixedly installed on the output end of the second electric rotary table. Two pre-alignment components are symmetrically installed at both the front and rear ends of the rotating rod.

[0014] Furthermore, the pre-alignment component includes a drive component and a spreading component. The drive component is mounted on the rotating rod, and a plurality of spreading components are mounted on the drive component. The drive component includes a fixed base, a sliding ring, and a servo push rod. The fixed base is fixedly mounted on the rotating rod, the sliding ring is slidably connected to one end of the fixed base near the rotating rod, the servo push rod is fixedly mounted on the fixed base, and the output end of the servo push rod is fixedly connected to the sliding ring.

[0015] Furthermore, the spreading assembly includes: a first rotating rod, a second rotating rod, a support rod, and guide wheels. One end of the first rotating rod is rotatably connected to a sliding ring, and one end of each of the two second rotating rods is rotatably connected to a fixed base. One end of the support rod is rotatably connected to the end of the first rotating rod away from the sliding ring via a rotating shaft, and the other end of the support rod is rotatably connected to the ends of the two second rotating rods away from the fixed base via a rotating shaft. The plurality of guide wheels are rotatably connected to the support rod via rotating shafts.

[0016] Furthermore, the product testing device includes a testing component and a marking component. The testing component is mounted on one side of the frame, and the marking component is mounted on the frame. The testing component includes an electric telescopic rod, an airtightness test connector, a fourth linear module, and an audio-visual unit. The housings of the two electric telescopic rods are rotatably connected to the left and right sides of the frame, respectively. The housing of the airtightness test connector is fixedly mounted on the output end of the electric telescopic rod. The airtightness test connectors on the output ends of the left and right electric telescopic rods are of different models. The fourth linear module is fixedly mounted on the rear side of the frame, and the audio-visual unit is fixedly mounted on the output end of the fourth linear module. The marking component includes a fifth linear module and a marker pen. The fifth linear module is fixedly mounted on the frame, and the marker pen is fixedly mounted on the output end of the fifth linear module.

[0017] Compared with the prior art, the beneficial effects of the present invention are: 1. The present invention integrates multiple processes such as rotary feeding, multi-station positioning and clamping, laser welding, airtightness detection, leak point marking, and sorting and unloading onto the same frame. It relies on the multi-station switching component to realize the intermittent cyclic flow of each process station, thus eliminating the drawbacks of traditional equipment where each process is set up independently, workpiece transfer is cumbersome, and waiting time is long. The entire equipment can continuously automate the entire process of exhaust pipe parts, from loading, welding, inspection to sorting and unloading. Each workstation works synchronously and collaboratively, effectively shortening the production cycle of a single product and significantly improving the overall production efficiency of batch processing of automotive exhaust pipes, adapting to the needs of large-scale continuous industrial production. By setting up a two-stage positioning structure of pre-centering and precise centering, the pre-centering component in the rotary loading device, through the cooperation of servo push rods, rotating rods, and guide wheels, completes the initial centering and clamping of the exhaust pipe parts, preventing workpiece displacement during the loading stage. The centering and positioning clamping component in the multi-station processing device, with the help of a hollow electric chuck, linear module, and gear transmission structure, achieves secondary precise centering and reliable clamping of the workpiece. Simultaneously, the hollow electric chuck can drive the exhaust pipe to rotate at a uniform speed, working in conjunction with the laser welding component to complete uniform welding of the circumferential weld seam. This effectively solves problems such as alignment deviation, workpiece loosening, and uneven welding that exist in traditional manual positioning and simple clamping, significantly improving the welding quality of the exhaust pipe and ensuring the consistency of processing accuracy and appearance performance of products in the same batch. 2. A multi-station switching assembly is formed by a square rotary table and a first electric rotary worktable. This assembly can simultaneously support multiple sets of centering and positioning clamping components corresponding to loading, welding, inspection, and unloading stations, each operating independently and synchronously. Compared to traditional single-station equipment that can only complete one process at a time, this equipment fully utilizes the machine's frame space, allowing a single unit to replace multiple single-process equipment, effectively reducing equipment investment costs and workshop floor space. The electric slip rings ensure stable power supply and signal transmission for all electric components during rotation, guaranteeing continuous and smooth switching of the rotary table and further enhancing the equipment's continuous operation capability. An integrated product inspection device allows exhaust pipes after welding to be directly transferred to the inspection station, enabling real-time online airtightness testing and leak point marking after welding, eliminating the need to transfer workpieces to independent inspection equipment and simplifying the quality inspection process. The airtightness test connector, combined with an electric telescopic rod, allows for pressure testing and leak detection close to the weld area, shortening the airtightness testing time. The audio-visual unit accurately identifies minute leaks in the weld, and the marking component marks the leak location in real time, facilitating subsequent rework. This combined detection method has high detection sensitivity and intuitive results, enabling full inspection of product welding quality, effectively controlling the quality of products leaving the factory, and reducing the probability of defective products flowing into downstream processes. 3. The system automatically distinguishes between qualified and unqualified products based on product testing results using a categorized feeding assembly: qualified exhaust pipes are directly conveyed out by a belt conveyor, while unqualified exhaust pipes are received and collected by a cylinder-driven sliding frame, eliminating the need for manual sorting and handling. This significantly reduces the labor intensity of on-site operators and minimizes errors and omissions caused by manual sorting; it also avoids human contact with high-temperature welding workpieces, improving the working environment and enhancing production safety. The linear modules, electric rotary worktable, servo push rods, and cylinders in the device all utilize standardized modular drive components. The laser welding head can achieve multi-dimensional position adjustment through two sets of linear modules, allowing for adjustments to the clamping distance, welding position, rotation angle, and testing parameters according to different specifications and sizes of automotive exhaust pipes. The equipment is highly flexible and adaptable, meeting the processing needs of various exhaust pipe models. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0019] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 ; Figure 2 This is a front view of the present invention; Figure 3 This is a top view of the present invention; Figure 4 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 ; Figure 5 for Figure 4 Enlarged view of A in the middle; Figure 6 for Figure 4 Enlarged view of B in the middle; Figure 7 This is a schematic diagram of the structure of the present invention with part of the frame removed. Figure 1 ; Figure 8 This is a schematic diagram of the structure of the present invention with part of the frame removed. Figure 2 ; Figure 9 This is a schematic diagram of the structure of the present invention with part of the frame removed. Figure 3 Figure 10 This is a partial structural schematic diagram of the multi-station processing device of the present invention; Figure 11 This is a partial structural schematic diagram of the rotary feeding device of the present invention; Figure 12 for Figure 11 Enlarged view of C; Figure 13 This is a partial structural schematic diagram of the product testing device of the present invention.

[0020] The labels in the diagram represent: 1. Frame; 2. Rotary feeding device; 21. Second electric rotary table; 22. Rotating rod; 23. Fixed base; 24. Sliding ring; 25. Servo push rod; 26. First rotating rod; 27. Second rotating rod; 28. Support rod; 29. ​​Guide wheel; 3. Multi-station processing device; 31. Electric slip ring; 32. Square rotary table; 33. First electric rotary table; 34. First linear module; 35. Hollow electric chuck; 36. Drive motor; 37. Drive gear; 38. Driven gear; 39. Belt conveyor; 310. Fixed frame; 311. Sliding frame; 312. Cylinder; 313. Second linear module; 314. Third linear module; 315. Laser welding head; 4. Product inspection device; 41. Electric telescopic rod; 42. Air tightness test connector; 43. Fourth linear module; 44. Audio-visual instrument; 45. Fifth linear module; 46. Marker pen. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0022] The present invention will be further described below with reference to embodiments.

[0023] The terms "left," "right," "front," "back," "up," and "down" used in the following description refer to the orientation from the perspective of the front view.

[0024] Example 1: In some examples, please refer to Figures 1-13 An integrated laser welding device for automotive exhaust pipes includes a frame 1, and further includes a rotary loading device 2, a multi-station processing device 3, and a product inspection device 4. The rotary loading device 2 is installed on the front side of the frame 1 for pre-positioning and loading two exhaust pipe parts. The multi-station processing device 3 is installed on the frame 1 for precisely positioning, fixing, and welding the exhaust pipe parts. The product inspection device 4 is installed on one side of the frame 1 for continuously testing the airtightness and marking leaks in the exhaust pipes welded on the multi-station processing device 3.

[0025] The multi-station processing device 3 includes: a multi-station switching component, a centering and positioning clamping component, a sorting and unloading component, and a laser welding component. The multi-station switching component is mounted on the frame 1 to realize intermittent switching between different stations. Multiple centering and positioning clamping components are mounted on the multi-station switching component to accurately position and center the exhaust pipe parts. The sorting and unloading component is mounted on the frame 1 to sort and unload qualified and unqualified exhaust pipes from the centering and positioning clamping component. The laser welding component is mounted on the frame 1 for welding the exhaust pipe parts clamped by the centering and positioning clamping component.

[0026] like Figure 1 , Figure 7 , Figure 8 , Figure 9 As shown, the multi-station switching assembly includes: an electric slip ring 31, a square rotary table 32, and a first electric rotary worktable 33. The fixed ends of the two electric slip rings 31 are fixedly installed on the left and right sides of the frame 1. The left and right sides of the square rotary table 32 are respectively fixedly connected to the rotating ends of the two electric slip rings 31. The first electric rotary worktable 33 is fixedly installed on one side of the frame 1, and the output end of the first electric rotary worktable 33 is fixedly connected to the rotating end of one of the electric slip rings 31.

[0027] like Figure 4 , Figure 6 As shown, the centering and positioning clamping assembly includes: a first linear module 34, a hollow electric chuck 35, a drive motor 36, a drive gear 37, and a driven gear 38. Two first linear modules 34 are symmetrically fixedly installed on one side of a square rotary table 32. The hollow electric chuck 35 is rotatably connected to the output end of the first linear module 34. The drive motor 36 is fixedly installed on the output end of the first linear module 34. The drive gear 37 is fixedly installed on the output shaft of the drive motor 36. The driven gear 38 is fixedly installed on one side of the hollow electric chuck 35. The driven gear 38 and the drive gear 37 mesh with each other.

[0028] The first electric rotary table 33 of the multi-station switching component rotates intermittently by a preset angle, driving the square rotary table 32 to rotate intermittently by a preset angle. The square rotary table 32 rotates intermittently by a preset angle, driving multiple centering and positioning clamping components to switch at different positions, realizing multi-station switching of the centering and positioning clamping components. The first linear module 34, the hollow electric chuck 35, and the drive motor 36 are electrically connected to an external controller through an electric slip ring 31. The rotary feeding device 2 feeds two exhaust pipe parts to the preset position of the centering and positioning clamping components in front of the square rotary table 32. At this time, the output end of the first linear module 34 moves, driving the hollow electric chuck 35 to move towards the exhaust pipe parts. The two hollow electric chucks 35 start to clamp the two exhaust pipe parts respectively. At this time, the two exhaust pipe parts achieve secondary centering and positioning under the clamping of the two hollow electric chucks 35. Then, the output end of the first linear module 34 moves, driving the two hollow electric chucks 35 to move away from each other, removing the two exhaust pipe parts from the rotary feeding device 2 to adapt to exhaust pipe parts of different sizes.

[0029] The centering and positioning clamping assembly holding two exhaust pipe parts on the front side of the square rotary table 32 rotates to the upper side of the square rotary table 32. The output end of the first linear module 34 moves, causing the two hollow electric chucks 35 to move closer to each other, so that the two exhaust pipe parts move closer to each other to a preset position. The output shaft of the drive motor 36 rotates, which drives the drive gear 37 to rotate. The drive gear 37 rotates, which drives the driven gear 38 to rotate. The driven gear 38 rotates, which drives the hollow electric chuck 35 to rotate. The hollow electric chuck 35 rotates, which drives the exhaust pipe parts to rotate, and then they are welded together with the laser welding assembly.

[0030] like Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 7As shown, the sorting and feeding assembly includes: a belt conveyor 39, a fixed frame 310, a sliding frame 311, and cylinders 312. The outer shell of the belt conveyor 39 is fixedly installed on the lower side of the frame 1. The fixed frame 310 is fixedly installed on one side of the frame 1. The sliding frame 311 is slidably connected to the fixed frame 310. The outer shells of the two cylinders 312 are fixedly installed on the fixed frame 310, and the output end of the cylinder 312 is fixedly connected to the sliding frame 311.

[0031] After the exhaust pipe is welded, the centering and positioning clamping assembly on the upper side of the square rotary table 32 rotates the welded exhaust pipe to the next station for inspection. At this time, the centering and positioning clamping assembly is located on the rear side of the square rotary table 32, and the product inspection device 4 inspects the exhaust pipe on the centering and positioning clamping assembly on the rear side of the square rotary table 32.

[0032] If the exhaust pipe is qualified, the square rotary table 32 continues to rotate. The centering and positioning clamping component on the rear side of the square rotary table 32 clamps the qualified exhaust pipe and rotates it. When it rotates to the lower side of the square rotary table 32, the hollow electric chuck 35 of the centering and positioning clamping component releases the exhaust pipe. At the same time, the output ends of the two first linear modules 34 move away from each other, causing the two hollow electric chucks 35 to move away from each other. The qualified exhaust pipe falls onto the belt conveyor 39, and the belt conveyor 39 transports the qualified exhaust pipe away.

[0033] If the exhaust pipe is unqualified, the output end of the cylinder 312 of the sorting and unloading component extends, causing the sliding frame 311 to move away from the fixed frame 310. After moving to the preset position, it stops. At this time, the sliding frame 311 is located directly below the centering and positioning clamping component on the rear side of the square rotary table 32. The two hollow electric chucks 35 of the centering and positioning clamping component on the rear side of the square rotary table 32 release the unqualified exhaust pipe. At the same time, the output ends of the two first linear modules 34 move away from each other, causing the two hollow electric chucks 35 to move away from each other. The unqualified exhaust pipe falls into the sliding frame 311 and from the sliding frame 311 to the fixed frame 310. The output end of the cylinder 312 shortens and returns to the initial state, causing the sliding frame 311 to move to the preset position, completing the sorting and unloading of the exhaust pipe.

[0034] like Figure 2 , Figure 8 , Figure 10 As shown, the laser welding assembly includes: a second linear module 313, a third linear module 314, and a laser welding head 315. The second linear module 313 is fixedly mounted on the frame 1, the third linear module 314 is fixedly mounted on the output end of the second linear module 313, and the laser welding head 315 is fixedly connected to the output end of the third linear module 314.

[0035] The centering and positioning clamping assembly on the upper side of the square rotary table 32 clamps and centers the exhaust pipe parts. The output end of the second linear module 313 of the laser welding assembly moves, driving the third linear module 314 to move. The output end of the third linear module 314 moves, driving the laser welding head 315 to move. The laser welding head 315 stops after moving to the preset position. The centering and positioning clamping assembly drives the two exhaust pipe parts to rotate. The laser welding head 315 welds the two rotating exhaust pipe parts, completing the welding of the exhaust pipe.

[0036] Through a two-stage positioning structure of pre-centering and precise centering, the pre-centering component in the rotary feeding device 2 completes the initial centering and clamping of the exhaust pipe parts by cooperating with the servo push rod 25, the rotating rod and the guide wheel 29, so as to avoid the workpiece shifting during the feeding stage; the centering and positioning clamping component in the multi-station processing device 3 achieves secondary precise centering and reliable clamping of the workpiece by means of the hollow electric chuck 35, the linear module and the gear transmission structure.

[0037] Meanwhile, the hollow electric chuck 35 can drive the exhaust pipe to rotate at a uniform speed, and work with the laser welding components to complete the uniform welding of the circumferential weld. This effectively solves the problems of alignment deviation, workpiece loosening, and uneven welding that exist in traditional manual positioning and simple clamping. It greatly improves the welding quality of the exhaust pipe and ensures the consistency of processing accuracy and appearance performance of products in the same batch.

[0038] The square rotary table 32, in conjunction with the first electric rotary worktable 33, forms a multi-station switching assembly. This assembly can simultaneously support multiple sets of centering and positioning clamping components, corresponding to the loading, welding, inspection, and unloading stations, respectively. Each station operates independently and synchronously. Compared to the traditional single-station equipment that can only complete one process at a time, this equipment makes full use of the space in the frame 1. A single unit can replace multiple single-process equipment, effectively reducing equipment investment costs and workshop floor space. The electric slip ring 31 ensures stable power supply and signal transmission for each electric component during rotation, guaranteeing a continuous and smooth intermittent switching process for the rotary table, further enhancing the equipment's continuous operation capability.

[0039] Example 2: In some embodiments, such as Figures 1-13 As shown, in a preferred embodiment of the present invention, the rotary feeding device 2 includes a rotary component and a pre-alignment component. The rotary component is installed on the front side of the frame 1, and a plurality of pre-alignment components are installed at the output end of the rotary component.

[0040] like Figure 3 , Figure 8 , Figure 11 , Figure 12As shown, the rotating assembly includes a second electric rotating worktable 21 and a rotating rod 22. The second electric rotating worktable 21 is fixedly installed on the front side of the frame 1. The rotating rod 22 is rotatably connected to the frame 1 via a rotating shaft. One end of the rotating shaft of the rotating rod 22 is fixedly installed on the output end of the second electric rotating worktable 21. Two pre-alignment components are symmetrically installed at both the front and rear ends of the rotating rod 22.

[0041] The pre-alignment component includes a drive component and a spreading component. The drive component is mounted on the rotating rod 22, and multiple spreading components are mounted on the drive component. The drive component includes a fixed base 23, a sliding ring 24, and a servo push rod 25. The fixed base 23 is fixedly mounted on the rotating rod 22, the sliding ring 24 is slidably connected to one end of the fixed base 23 near the rotating rod 22, and the servo push rod 25 is fixedly mounted on the fixed base 23. The output end of the servo push rod 25 is fixedly connected to the sliding ring 24.

[0042] like Figure 12 As shown, the spreading assembly includes: a first rotating rod 26, a second rotating rod 27, a support rod 28, and guide wheels 29. One end of the first rotating rod 26 is rotatably connected to the sliding ring 24. One end of each of the two second rotating rods 27 is rotatably connected to the fixed base 23. One end of the support rod 28 is rotatably connected to the end of the first rotating rod 26 away from the sliding ring 24 via a rotating shaft. The other end of the support rod 28 is rotatably connected to the ends of the two second rotating rods 27 away from the fixed base 23 via a rotating shaft. The multiple guide wheels 29 are rotatably connected to the support rod 28 via rotating shafts.

[0043] A manual or external robotic arm moves two exhaust pipe parts to the guide wheel 29 position, inserting them into two symmetrical pre-alignment components at one end of the rotating rod 22. The output end of the servo push rod 25 moves a preset distance, causing the sliding ring 24 to move a preset distance. The movement of the sliding ring 24 causes the first rotating rod 26 to move and rotate by a preset angle. The movement and rotation of the first rotating rod 26 causes the support rod 28 to move. The movement of the support rod 28 causes the second rotating rod 27 to rotate, so that multiple support rods 28 move synchronously toward the inner wall of the exhaust pipe. The guide wheel 29 on the exhaust pipe is in close contact with the inner wall of the exhaust pipe, and at this time, the two exhaust pipe parts are pre-aligned and clamped.

[0044] The output end of the second electric rotary table 21 of the rotating assembly rotates, causing the rotating rod 22 to rotate 180 degrees. The rotation of the rotating rod 22 180 degrees transports the two pre-aligned and clamped exhaust pipe parts to the centering and positioning clamping assembly position on the front side of the square rotary table 32, completing the pre-alignment and clamping feeding, and adapting to exhaust pipe parts of different sizes.

[0045] Example 3: In some embodiments, such as Figures 1-13As shown, in a preferred embodiment of the present invention, the product testing device 4 includes a testing component and a marking component. The testing component is installed on one side of the frame 1, and the marking component is installed on the frame 1. The testing component includes an electric telescopic rod 41, an airtightness test connector 42, a fourth linear module 43, and an audio-visual device 44. The housings of the two electric telescopic rods 41 are respectively rotatably connected to the left and right sides of the frame 1. The housing of the airtightness test connector 42 is fixedly installed at the output end of the electric telescopic rod 41. The airtightness test connectors 42 on the output ends of the left and right electric telescopic rods 41 are of different models. The fourth linear module 43 is fixedly installed on the rear side of the frame 1, and the audio-visual device 44 is fixedly installed at the output end of the fourth linear module 43. The marking component includes a fifth linear module 45 and a marker pen 46. The fifth linear module 45 is fixedly installed on the frame 1, and the marker pen 46 is fixedly installed at the output end of the fifth linear module 45.

[0046] like Figure 9 , Figure 13 As shown, the centering and positioning clamping assembly on the rear side of the square rotary table 32 clamps the welded exhaust pipe. The output end of the fourth linear module 43 of the product testing device 4 moves, driving the audio-visual instrument 44 to a preset position. The position varies depending on the weld. The output end of the electric telescopic rod 41 moves, driving the two airtightness test connectors 42 to a preset position close to the weld. Moving the airtightness test connectors 42 to a position close to the weld reduces the space for compressed air to be poured into the airtightness test connectors 42, thereby reducing the testing time. The input end of the airtightness test connectors 42 is connected to an external air supply device, which pours compressed air into the exhaust pipe through the airtightness test connectors 42. Compressed air and maintain pressure for a preset time within a preset pressure range. An external controller controls the centering and positioning clamping assembly to rotate the welded exhaust pipe. An audio-visual instrument 44 detects the weld seam of the welded exhaust pipe and transmits an electrical signal to the external controller. When the audio-visual instrument 44 detects a leak in the weld seam, the external controller controls the centering and positioning clamping assembly to rotate the welded exhaust pipe to a preset position and stop. The external controller controls the output end of the fifth linear module 45 to move, which in turn moves the marker pen 46 to mark the location of the leak in the exhaust pipe weld seam, thus completing product inspection and leak marking. This method is compatible with the inspection and marking of exhaust pipes of different sizes.

[0047] The integrated product testing device 4 allows the exhaust pipe after welding to be directly transferred to the testing station, enabling real-time online airtightness testing and leak point marking after welding. This eliminates the need to transfer the workpiece to separate testing equipment, simplifying the quality inspection process. The airtightness testing connector 42, in conjunction with the electric telescopic rod 41, can be used to perform pressure testing close to the weld area, shortening the airtightness testing time. The audio-visual instrument 44 can accurately identify tiny leaks in the weld, and the marking component can mark the leak location in real time, facilitating subsequent rework. This combined testing method offers high sensitivity and intuitive results, enabling full inspection of product welding quality, effectively controlling the quality of products leaving the factory, and reducing the probability of defective products flowing into downstream processes.

[0048] The sorting and unloading components automatically distinguish between qualified and unqualified products based on product inspection results: qualified exhaust pipes are directly conveyed out by belt conveyor 39, while unqualified exhaust pipes are received and collected by sliding frame 311 driven by cylinder 312, eliminating the need for manual sorting and handling of workpieces throughout the process. On the one hand, this significantly reduces the labor intensity of on-site operators and reduces the problems of missorting and omission caused by manual sorting; on the other hand, it avoids manual contact with high-temperature welding workpieces, improves the working environment, and enhances the safety of the production process. The linear modules, electric rotary worktable, servo push rod 25, cylinder 312, and other components in the device all adopt standardized modular drive components. The laser welding head 315 can achieve multi-dimensional position adjustment through two sets of linear modules, and can adjust the clamping distance, welding position, rotation angle, and detection parameters according to different specifications and sizes of automotive exhaust pipes. The equipment has strong flexibility and adaptability, and can meet the processing needs of various types of exhaust pipes.

[0049] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An integrated laser welding device for automotive exhaust pipes, comprising a frame (1), characterized in that, Also includes: The machine includes a rotary feeding device (2), a multi-station processing device (3), and a product inspection device (4). The front side of the frame (1) is equipped with a rotary feeding device (2) for pre-positioning and feeding two exhaust pipe parts. The frame (1) is equipped with a multi-station processing device (3) for precisely positioning, fixing, welding, and unloading the exhaust pipe parts. The frame (1) is equipped with a product inspection device (4) on one side for continuously testing the airtightness and marking leaks in the exhaust pipes welded on the multi-station processing device (3). The multi-station processing device (3) includes: a multi-station switching component, a centering and positioning clamping component, a sorting and unloading component, and a laser welding component. The multi-station switching component is installed on the frame (1) to realize intermittent switching between different stations. Multiple centering and positioning clamping components are installed on the multi-station switching component to accurately position and center and clamp the exhaust pipe parts. The sorting and unloading component is installed on the frame (1) to sort and unqualified exhaust pipes on the centering and positioning clamping component. The laser welding component is installed on the frame (1) for welding the exhaust pipe parts clamped by the centering and positioning clamping component.

2. The integrated laser welding device for automotive exhaust pipes according to claim 1, characterized in that, The multi-station switching assembly includes: an electric slip ring (31), a square rotary table (32), and a first electric rotary table (33). The fixed ends of the two electric slip rings (31) are fixedly installed on the left and right sides of the frame (1). The left and right sides of the square rotary table (32) are respectively fixedly connected to the rotating ends of the two electric slip rings (31). The first electric rotary table (33) is fixedly installed on one side of the frame (1). The output end of the first electric rotary table (33) is fixedly connected to the rotating end of one of the electric slip rings (31).

3. The integrated laser welding device for automotive exhaust pipes according to claim 2, characterized in that, The centering and positioning clamping assembly includes: a first linear module (34), a hollow electric chuck (35), a drive motor (36), a drive gear (37), and a driven gear (38). The two first linear modules (34) are symmetrically fixedly installed on one side of the square rotary table (32). The hollow electric chuck (35) is rotatably connected to the output end of the first linear module (34). The drive motor (36) is fixedly installed on the output end of the first linear module (34). The drive gear (37) is fixedly installed on the output shaft of the drive motor (36). The driven gear (38) is fixedly installed on one side of the hollow electric chuck (35). The driven gear (38) and the drive gear (37) mesh with each other.

4. The integrated laser welding device for automotive exhaust pipes according to claim 3, characterized in that, The sorting and unloading assembly includes: a belt conveyor (39), a fixed frame (310), a sliding frame (311), and cylinders (312). The outer shell of the belt conveyor (39) is fixedly installed on the lower side of the frame (1). The fixed frame (310) is fixedly installed on one side of the frame (1). The sliding frame (311) is slidably connected to the fixed frame (310). The outer shells of the two cylinders (312) are fixedly installed on the fixed frame (310). The output end of the cylinder (312) is fixedly connected to the sliding frame (311).

5. The integrated laser welding device for automotive exhaust pipes according to claim 4, characterized in that, The laser welding assembly includes a second linear module (313), a third linear module (314), and a laser welding head (315). The second linear module (313) is fixedly mounted on the frame (1), the third linear module (314) is fixedly mounted on the output end of the second linear module (313), and the laser welding head (315) is fixedly connected to the output end of the third linear module (314).

6. The integrated laser welding device for automotive exhaust pipes according to claim 5, characterized in that, The rotary feeding device (2) includes a rotary component and a pre-alignment component. The rotary component is installed on the front side of the frame (1), and multiple pre-alignment components are installed at the output end of the rotary component.

7. The integrated laser welding device for automotive exhaust pipes according to claim 6, characterized in that, The rotating assembly includes a second electric rotary table (21) and a rotating rod (22). The second electric rotary table (21) is fixedly installed on the front side of the frame (1). The rotating rod (22) is rotatably connected to the frame (1) via a rotating shaft. One end of the rotating shaft of the rotating rod (22) is fixedly installed at the output end of the second electric rotary table (21). Two pre-alignment components are symmetrically installed at both the front and rear ends of the rotating rod (22).

8. The integrated laser welding device for automotive exhaust pipes according to claim 7, characterized in that, The pre-alignment component includes a drive component and a spreading component. The drive component is mounted on the rotating rod (22), and multiple spreading components are mounted on the drive component. The drive component includes a fixed base (23), a sliding ring (24), and a servo push rod (25). The fixed base (23) is fixedly mounted on the rotating rod (22), and the sliding ring (24) is slidably connected to one end of the fixed base (23) near the rotating rod (22). The servo push rod (25) is fixedly mounted on the fixed base (23), and the output end of the servo push rod (25) is fixedly connected to the sliding ring (24).

9. The integrated laser welding device for automotive exhaust pipes according to claim 8, characterized in that, The spreading assembly includes: a first rotating rod (26), a second rotating rod (27), a support rod (28), and guide wheels (29). One end of the first rotating rod (26) is rotatably connected to the sliding ring (24), and one end of each of the two second rotating rods (27) is rotatably connected to the fixed seat (23). One end of the support rod (28) is rotatably connected to the end of the first rotating rod (26) away from the sliding ring (24) via a rotating shaft. The other end of the support rod (28) is rotatably connected to the end of each of the two second rotating rods (27) away from the fixed seat (23) via a rotating shaft. The multiple guide wheels (29) are rotatably connected to the support rod (28) via rotating shafts.

10. The integrated laser welding device for automotive exhaust pipes according to claim 9, characterized in that, The product testing device (4) includes a testing component and a marking component. The testing component is installed on one side of the frame (1), and the marking component is installed on the frame (1). The testing component includes an electric telescopic rod (41), an airtight test connector (42), a fourth linear module (43), and an audio-visual device (44). The outer shells of the two electric telescopic rods (41) are rotatably connected to the left and right sides of the frame (1). The outer shell of the airtight test connector (42) is fixedly installed at the output end of the electric telescopic rod (41). The airtight test connectors (42) on the output ends of the electric telescopic rods (41) on the left and right sides are of different models. The fourth linear module (43) is fixedly installed on the rear side of the frame (1), and the audio-visual device (44) is fixedly installed at the output end of the fourth linear module (43). The marking component includes a fifth linear module (45) and a marker pen (46). The fifth linear module (45) is fixedly installed on the frame (1), and the marker pen (46) is fixedly installed at the output end of the fifth linear module (45).

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