Rotary laser welding device for automobile parts

Abstract

The invention provides an automobile part rotary laser welding device, which relates to the technical field of automobile part welding, and comprises a fixing mechanism for fixing a flange and an exhaust pipe body, and a laser welding mechanism for welding the fixed pipe body and the flange, the fixing mechanism comprises a rotating column arranged on the reciprocating rotating assembly, four limiting rods arranged on the end face of the rotating column in a sliding mode through elastic assemblies, four clamping blocks arranged on rod bodies of the limiting rods in a one-to-one correspondence mode, and a control assembly controlling the four clamping blocks to move along the rod bodies of the limiting rods. The pipe body and flange concentric fixing device can accurately adapt to flanges of different sizes, concentric fixing of the pipe body and the flanges is achieved, meanwhile, the welding seam quality is improved through reciprocating rotation welding, the product percent of pass is remarkably improved, and the production cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of automotive parts welding technology, specifically to a rotary laser welding device for automotive parts. Background Technology

[0002] In the automotive manufacturing industry, the welding quality of automotive parts directly affects the overall performance and safety of the vehicle. Among these processes, the welding of the exhaust pipe body to the flange is one of the key steps.

[0003] Currently, the existing welding process for exhaust pipes and flanges is typically as follows: First, operators manually spot-weld the flange to the end of the exhaust pipe. This step requires a high level of skill and experience from the operators, as the quality and location of the spot weld directly affect the subsequent welding results. After spot welding, the spot-welded flange and exhaust pipe are fixed to the welding device, and finally, the exhaust pipe and flange are formally welded together using the welding device.

[0004] However, traditional welding methods and the existing welding processes described above present numerous problems when welding components such as exhaust pipe bodies and flanges. Traditional fixing devices struggle to achieve precise fixation and concentric positioning of the flange and pipe body. In manual spot welding, due to inherent human error, it's difficult to guarantee accurate initial positioning of the flange and exhaust pipe ends, hindering subsequent precise fixation and concentric positioning. Furthermore, when fixing the spot-welded assembly to the welding device, the limitations of the fixing device also prevent effectively addressing the concentricity issue.

[0005] During the welding process, inaccurate welding positions and defects such as incomplete welds and uneven welds can easily occur due to insecure fixing or concentricity deviations. Incomplete welds result in insufficient connection strength between the flange and the exhaust pipe, making them prone to loosening or even detachment during vehicle operation due to vibration and thermal stress, severely affecting the normal operation of the vehicle's exhaust emission system. Uneven welds lead to localized stress concentration, reducing the fatigue resistance of components, shortening their service life, and ultimately affecting the overall reliability of the vehicle.

[0006] Especially in welding processes using simple clamps, the clamps cannot accommodate flanges and pipes of different sizes, nor can they effectively ensure concentricity, resulting in a low product yield. In particular, when dealing with exhaust pipes and flanges of different specifications required for different car models, simple clamps cannot securely hold and accurately position smaller or larger components, causing movement or misalignment during welding and producing a large number of defective products. This not only increases production costs but also extends the production cycle and impacts production efficiency because defective products require rework or scrapping.

[0007] Furthermore, due to the lack of an effective control mechanism during the welding process, frequent adjustments to the welding equipment and fixing devices are required for flanges and pipes of different specifications. Each adjustment consumes time and manpower, is complex, and demands a high level of technical skill from the operators. Operators need to be familiar with the welding parameters and fixing requirements of different specifications of components and be able to adjust the equipment accurately and quickly. Improper adjustments will affect the welding quality, further increasing production difficulty and costs. Summary of the Invention

[0008] To address the above problems, the present invention provides a rotary laser welding device for automotive parts.

[0009] To achieve the above objectives, the present invention provides the following technical solution: a rotary laser welding device for automotive parts, comprising a fixing mechanism for fixing a flange and an exhaust pipe body, and a laser welding mechanism for welding the fixed pipe body and flange. The fixing mechanism includes a rotating column mounted on a reciprocating rotating assembly, four limiting rods slidably mounted on the end face of the rotating column via an elastic component, four locking blocks corresponding one-to-one on the limiting rods, a control component for controlling the movement of the four locking blocks along the limiting rods, and a fixing component mounted on the rotating column for concentrically fixing the end of the pipe body passing through the flange. The limiting rods are composed of a vertical rod mounted perpendicular to the end face of the rotating column and an inclined rod mounted on the end of the first rod body away from the rotating column. The four inclined rods are respectively oriented towards the four vertical rods away from each other, and the angle between the inclined rods and the end face of the rotating column is between 15 degrees and 30 degrees.

[0010] Before welding, the flange is inserted between the four inclined rods, pushing the four inclined rods away from each other and compressing the elastic component. The flange is inserted between the four vertical rods and positioned to fit the end of the rotating column. The control component drives the four locking blocks to move towards the flange along the direction of the limit rod to fix the flange. The end of the pipe is inserted into the flange, and the fixing component fixes the pipe and the flange concentrically.

[0011] During welding, the reciprocating rotating component drives the rotating column to reciprocate around the axis, and the laser welding mechanism welds the pipe body and the flange.

[0012] Preferably, the rotating column has four positioning grooves with openings oriented towards the center of the end. The elastic component includes four positioning slide rods passing through different positioning grooves, positioning sliders slidably sleeved on the positioning slide rods, and positioning springs sleeved on the positioning slide rods. The four positioning springs are located at positions where the four positioning sliders are far apart from each other. When the four positioning springs are in their normal extended state, the four positioning sliders are located on the four positioning slide rods close to one end of each other, and the four positioning sliders are respectively connected to the vertical rods of different limiting rods.

[0013] Preferably, the control component includes a fixed slider that passes through a first fixed groove on one side of the limit rod, a first control rod with one end connected to a locking block and the other end perpendicularly passing through the end of the rotating column, and a control component disposed in the rotating column and driving the first control rod to move along the length of the rod, wherein the locking block is connected to the fixed slider.

[0014] Preferably, the control component includes an adjusting ring that passes through the end of the parallel rotating column and is inserted into the rotating column, four adjusting slide rods that are movably inserted through the ends of the four first control rods respectively, and a control structure that is set in the rotating column and controls the distance between the adjusting ring and the end of the rotating column. The four adjusting slide rods are fixedly connected to the adjusting ring at one end close to each other.

[0015] The angle between the adjusting slide rod and the end face of the rotating column is 0 degrees or between 15 degrees and 30 degrees. When the angle between the adjusting slide rod and the end face of the rotating column is between 15 degrees and 30 degrees, the end of the adjusting slide rod away from the adjusting ring tilts downward.

[0016] Preferably, the control structure includes a second adjusting rod vertically disposed on the end face of the adjusting ring away from the first control rod, a second lead screw disposed along the axis of the rotating column and threadedly connected to the second adjusting rod, and a second motor disposed inside the rotating column and controlling the rotation of the second lead screw.

[0017] Preferably, a control groove is provided at the center of the end of the rotating column. The fixing component includes a limiting block set at the opening of the control groove by a fixing rod, balls symmetrically set on the upper and lower symmetrical end faces of the limiting block by a buffer, two fixing blocks movably passing through the openings of the second fixing groove on the two symmetrical sides of the limiting block, and a fixing member set in the rotating column and controlling the two fixing blocks to move away from each other. The buffer pushes the two balls away from each other.

[0018] Preferably, the buffer includes two limiting telescopic rods vertically arranged on the upper and lower symmetrical end faces of the limiting block, and a limiting spring movably passing through the body of the limiting telescopic rod and connecting the two ends, with the opposite ends of the two limiting telescopic rods respectively rotatably connected to different balls.

[0019] Preferably, the fixing component includes a linkage bar that passes through the second fixing groove and is located on one side between the two fixing blocks; a second control rod that moves along the axis of rotation of the column, passes through the limiting block, and has its end connected to the middle of the linkage bar; a fixing structure that controls the movement of the second control rod along its length; and two fixed telescopic rods that are symmetrically arranged in the second fixing groove about the second control rod. One end of the two fixed telescopic rods is rotatably arranged close to each other on the second fixing groove wall away from the linkage bar, and the other end is rotatably connected to different fixing blocks respectively. A fixing spring is sleeved on the fixed telescopic rod to connect the two ends of the fixed telescopic rod. The two fixing blocks are slidably arranged along the length of the linkage bar.

[0020] Preferably, the linkage bar has a linkage groove along its length on the side closest to the two fixed blocks, and two sliding rods are slidably arranged in the linkage groove. The two sliding rods are perpendicularly fixed to different fixed blocks at their ends that are far apart from each other.

[0021] Preferably, the fixing structure includes a first adjusting rod disposed on the end of the second control rod along the length direction of the second control rod, a first lead screw with one end threadedly connected to the first adjusting rod and passing through the first adjusting rod, and a first motor disposed in the rotating column and driving the first lead screw to rotate.

[0022] The beneficial effects of this invention are:

[0023] 1. A four-bar positioning system, consisting of vertical and inclined bars, along with elastic and control components, can accommodate flanges of different sizes. Before welding, the flange is inserted between the four inclined bars. The inclined bars are compressed and move away from each other, compressing the elastic component. Once the flange is inserted between the vertical bars and positioned against the end of the rotating column, the control component drives the locking block to move along the positioning bars to fix the flange. This design overcomes the problem of traditional fixing devices being unable to adapt to flanges of different sizes, ensuring precise fixing of the flange and providing a stable foundation for subsequent welding. The fixing components also provide concentric fixing between the pipe body and the flange. This function effectively solves the problem of inaccurate welding position caused by concentricity deviation in traditional welding processes, avoiding welding defects such as incomplete welds and uneven welds. Concentric fixing ensures the connection strength between the flange and the exhaust pipe, allowing the welded assembly to better withstand vibration and thermal stress during vehicle operation, improving the stability and reliability of the vehicle's exhaust emission system.

[0024] 2. The laser welding mechanism drives the rotating column to reciprocate around the axial direction via a reciprocating rotating component, ensuring uniform heat distribution and preventing localized overheating or insufficient welding. This improves the quality and uniformity of the weld. A uniform weld reduces localized stress concentration, enhances the fatigue resistance of components, and extends their service life.

[0025] 3. Through precise fixing and concentric positioning, welding defects caused by insecure fixing or concentricity deviations in traditional welding processes are effectively avoided, resulting in a significant improvement in the product qualification rate after welding. Reducing the number of defective products means reducing the costs incurred due to rework or scrapping, including costs related to raw materials, energy, and labor. Attached Figure Description

[0026] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention, but do not constitute a limitation thereof. In the drawings:

[0027] Figure 1 This is a schematic diagram of the welding structure of the rotating laser welding device for automotive parts proposed in this invention for pipes and flanges.

[0028] Figure 2 This is a schematic diagram of the rotating laser welding device for automotive parts proposed in this invention.

[0029] Figure 3 This is a schematic diagram of the fixing mechanism of the present invention.

[0030] Figure 4 This is a schematic diagram of the control component structure of the present invention.

[0031] Figure 5 This is a schematic diagram of the structure of the control component of the present invention for fixing the flange.

[0032] Figure 6 This is a schematic diagram of the tilt state structure of the adjusting slide bar according to the present invention.

[0033] Figure 7 This is a schematic diagram of the fixed component structure of the present invention.

[0034] Figure 8 This is a schematic diagram of the cross-sectional structure of the fixing component of the present invention.

[0035] Figure 9 This is a schematic diagram of the cross-sectional structure of the fixing tube body of the fixing component of the present invention.

[0036] In the diagram: 1. Base; 2. Welding seat; 3. Rotating column; 4. Pipe body; 5. Flange; 6. Welding robotic arm; 7. Laser welding head; 8. Positioning groove; 9. Positioning slide rod; 10. Positioning spring; 11. Positioning slider; 12. Limiting rod; 13. First fixing groove; 14. First control rod; 15. Control groove; 16. Fixing rod; 17. Limiting block; 18. Second fixing groove; 19. Linkage bar; 20. Fixing block; 21. Limiting telescopic rod; 22. Limiting spring; 23. Ball bearing; 24. First motor; 25. First lead screw; 26. First adjusting rod; 27. Second control rod; 28. Sliding rod; 29. ​​Fixed telescopic rod; 30. Fixed spring; 31. Adjusting ring; 32. Adjusting slide rod; 33. Second adjusting rod; 34. Second motor; 35. Second lead screw; 36. Locking block. Detailed Implementation

[0037] To make the technical means, creative features, achieved objectives, and effects of this invention readily understandable, the invention is further described below with reference to specific embodiments and accompanying drawings. However, the following embodiments are merely preferred embodiments of this invention and not all embodiments. Other embodiments obtained by those skilled in the art based on the embodiments described herein without creative effort are all within the protection scope of this invention.

[0038] To address the problems of incompatibility with flanges 5 and pipe bodies 4 in existing automotive exhaust emission systems, such as the inability to adapt to flanges 5 of different sizes, welding defects caused by concentricity deviations, and unstable welding quality, and to improve the accuracy, stability, and efficiency of flange-to-pipe-body welding, this invention proposes a welding device for flanges 5 and pipe bodies 4 in automotive exhaust emission systems. This device, through four limiting rods 12 composed of vertical and inclined rods, along with an elastic component and a control component, can adapt to flanges 5 of different sizes. The control component drives a locking block 36 to precisely fix the flange 5, while simultaneously working with a fixing component to achieve concentric fixation of the pipe body 4 and flange 5. Furthermore, a reciprocating rotation component drives a rotating column 3 to reciprocate around the axial direction, working in conjunction with a laser welding mechanism to ensure uniform heat distribution during welding. The combination of the limiting rods 12, elastic component, and control component allows for the adaptation and precise fixing of flanges 5 of different sizes; the fixing component ensures concentricity between the pipe body 4 and flange 5, solving the concentricity deviation problem; and the combination of the reciprocating rotation component and the laser welding mechanism improves the weld quality and uniformity. This design not only effectively avoids the defects of traditional welding and significantly improves the product qualification rate, but also reduces the costs of raw materials, energy and labor caused by rework or scrap.

[0039] Example 1: Reference Figures 1-9 The illustrated automotive component rotary laser welding device includes a fixing mechanism for fixing a flange 5 and an exhaust pipe body 4, and a laser welding mechanism for welding the fixed pipe body 4 and flange 5. The fixing mechanism includes a rotating column 3 mounted on a reciprocating rotating assembly, four limiting rods 12 slidably mounted on the end face of the rotating column 3 via elastic components, four locking blocks 36 corresponding to each other on the body of the limiting rods 12, a control component for controlling the movement of the four locking blocks 36 along the body of the limiting rods 12, and a fixing component mounted on the rotating column 3 for concentrically fixing the end of the pipe body 4 passing through the flange 5. The limiting rods 12 are composed of a vertical rod mounted perpendicular to the end face of the rotating column 3 and an inclined rod mounted on the end of the first rod away from the rotating column 3. The four inclined rods are respectively oriented towards the side away from the four vertical rods, and the angle between the inclined rods and the end face of the rotating column 3 is between 15 degrees and 30 degrees.

[0040] Before welding, flange 5 is inserted between four inclined rods, pushing the four inclined rods away from each other and compressing the elastic component. Flange 5 is inserted between four vertical rods and positioned and fitted with the end of rotating column 3. The control component drives four locking blocks 36 to move towards flange 5 along the direction of the limiting rod 12 to fix flange 5. The end of pipe body 4 is inserted into flange 5, and the fixing component fixes pipe body 4 and flange 5 concentrically.

[0041] During welding, the reciprocating rotating assembly drives the rotating column 3 to reciprocate around the axial direction, and the laser welding mechanism welds the tube body 4 and the flange 5.

[0042] like Figures 1-5 As shown, in this embodiment, the flange 5 is first inserted between the four inclined rods. Since there is an angle between the inclined rods and the end face of the rotating column 3 between 15 and 30 degrees, and the four inclined rods are respectively facing away from each other towards the four vertical rods, when the flange 5 is inserted, it applies pressure to the inclined rods, pushing them away from each other. During the movement, the inclined rods compress the elastic components they are connected to, causing the elastic components to generate elastic potential energy. The flange 5 is continuously pushed until it is inserted between the four vertical rods and positioned against the end of the rotating column 3. At this point, the flange 5 is in the predetermined welding position. The control component then starts working, driving the four locking blocks 36 to move towards the flange 5 along the direction of the limiting rod 12. The locking blocks 36 gradually approach the flange 5 and finally apply pressure, firmly fixing the flange 5 between the four vertical rods and preventing displacement during the welding process. Next, the end of the pipe body 4 is inserted into the flange 5. At this point, the fixing component on the rotating column 3 comes into play, concentrically fixing the pipe body 4 and the flange 5, ensuring that their central axes coincide, thus providing a foundation for subsequent high-quality welding. The reciprocating rotation component is activated, driving the rotating column 3 to reciprocate around its axis. Since both the flange 5 and the pipe body 4 are fixed to the rotating column 3, they reciprocate together with the column 3. Simultaneously, the laser welding mechanism begins to work, welding the pipe body 4 and the flange 5. During the reciprocating rotation of the rotating column 3, the laser welding mechanism can evenly weld the connection between the pipe body 4 and the flange 5.

[0043] This embodiment utilizes four limiting rods 12, composed of vertical and inclined rods, in conjunction with an elastic component to accommodate flanges 5 of different sizes. When flanges 5 of different sizes are inserted between the inclined rods, the inclined rods automatically adjust their distance from each other according to the size of the flanges 5. The elastic component compresses to accommodate changes in the flange size, and then the clamping block 36 fixes the flange 5, solving the problem that traditional fixing devices cannot accommodate flanges of different sizes. The control component drives the clamping block 36 to move along the limiting rods 12 to fix the flange 5, ensuring the accuracy and stability of the flange 5's position before welding. During welding, the clamping block 36 prevents the flange 5 from shifting due to welding thermal stress and other factors, providing a stable foundation for subsequent welding and ensuring the accuracy of the welding position. The fixing component concentrically fixes the pipe body 4 and the flange 5, effectively solving the problem of inaccurate welding position caused by concentricity deviation in traditional welding processes. Concentric fixing ensures the connection strength between the flange 5 and the exhaust pipe body 4, enabling the welded assembly to better withstand vibration and thermal stress during vehicle operation, improving the stability and reliability of the vehicle's exhaust emission system. By precisely fixing and concentrically positioning, welding defects such as incomplete welds and uneven welds caused by insecure fixing or concentricity deviations in traditional welding processes are effectively avoided, resulting in a significant improvement in the product qualification rate after welding. Reducing the number of defective products means reducing the costs incurred due to rework or scrapping, including costs related to raw materials, energy, and labor.

[0044] like Figure 1 and Figure 2 As shown, the laser welding mechanism includes a laser welding head 7 mounted on a welding robotic arm 6; a rotating column 3 is rotatably mounted on a rotating seat 2, and the rotating seat 2 is mounted on a base 1, which is provided with a reciprocating rotating assembly that drives the rotating column 3 to reciprocate around the axial direction.

[0045] The reciprocating rotation assembly includes a first gear fixedly mounted on the rotating column 3 and a second gear driven by a motor. The first gear meshes with the second gear, and the motor drives the transmission between the first gear and the second gear, causing the rotating column 3 to reciprocate.

[0046] It is understandable that the four limiting rods 12 located at the ends of the rotating column 3 can be elastically positioned in various ways. This embodiment provides the following solution:

[0047] like Figures 3-5As shown, the rotating column 3 has four positioning grooves 8 with openings in the length direction facing the center of the end. The elastic component includes four positioning slide rods 9 passing through different positioning grooves 8, positioning sliders 11 slidably sleeved on the body of the positioning slide rods 9, and positioning springs 10 sleeved on the body of the positioning slide rods 9. The four positioning springs 10 are respectively located at positions far apart from the four positioning sliders 11. When the four positioning springs 10 are in the normal extended state, the four positioning sliders 11 are located on the body of the four positioning slide rods 9 close to one end of each other, and the four positioning sliders 11 are respectively connected to the vertical rods of different limiting rods 12.

[0048] In this embodiment, when the positioning slider 11 moves away from the end center along the positioning slide rod 9 under the action of external force, it compresses the positioning spring 10, which stores elastic potential energy. When the external force disappears, the positioning spring 10 releases the elastic potential energy, pushing the positioning slider 11 to move closer to the end center along the positioning slide rod 9, thus achieving reset. This elastic support and reset function provides a buffer and recovery mechanism for the movement of the limiting rod 12. When the four positioning springs 10 are in their normal extended state, the four positioning sliders 11 are located close to one end of the four positioning slide rods 9. At this time, the limiting rod 12 is also in a position relatively close to the end center of the rotating column 3, providing an initial positioning state for the subsequent insertion and fixation of the flange 5, ensuring that the entire device is in a stable and orderly state when not subjected to external force. Before welding, when flanges 5 of different sizes are inserted between the four inclined rods, pressure is applied to the inclined rods, which transmit the pressure to the positioning slider 11 connected to them, causing the positioning slider 11 to move away from the end center along the positioning slide rod 9, while compressing the positioning spring 10. Because the positioning spring 10 is elastic, it can automatically adjust its compression degree according to the size of the flange 5, thereby adapting to the different pressure and displacement requirements generated when flanges of different sizes are inserted. When the flange 5 is inserted between the four vertical rods and positioned and fitted against the end of the rotating column 3, the positioning spring 10 will apply a stable reverse force to the limiting rod 12 through the positioning slider 11 based on its own elastic restoring force, so that the limiting rod 12 can tightly abut against the flange 5 (the flange 5 is clamped and positioned by the vertical rods of the four limiting rods 12), ensuring that the flange 5 always maintains a stable fixed state during the welding process and will not have problems with insecure fixing due to size differences.

[0049] Example 2: In response to the above Example 1, which uses a control component to drive the card block 36 to move along the limit rod 12, this example provides the following solution.

[0050] like Figures 3-5As shown, the control assembly includes a fixed slider that passes through a first fixed groove 13 on one side of the limit rod 12, a first control rod 14 with one end connected to a locking block 36 and the other end perpendicularly passing through the end of the rotating column 3, and a control component that is disposed in the rotating column 3 and drives the first control rod 14 to move along the length of the rod. The locking block 36 is connected to the fixed slider.

[0051] In this embodiment, when the flange 5 is positioned between the four vertical rods 12 on the end face of the rotating column 3, the first control rod 14 is moved into the rotating column 3 along the length of the rod by the control component. At this time, the fixed slider slides downward in the first fixed groove 13. Since the inclined rod is in an inclined state, the fixed slider moves in the first fixed groove 13 first along the length of the inclined rod to the position above the flange 5, and then moves along the length of the vertical rod to achieve quick and stable clamping and fixing of the flange 5 located at the end of the rotating column 3. This ensures that the flange 5 is stably welded in the subsequent welding process and prevents it from moving due to vibration, thermal stress and other factors during the subsequent welding of the pipe body 4 and the flange 5, thereby ensuring the accuracy of the welding position and the quality of the weld.

[0052] It is understandable that the first control lever 14 can be moved along its length in various ways. This embodiment provides the following solution:

[0053] like Figures 4-6 As shown, the control components include an adjusting ring 31 that passes through the end of the parallel rotating column 3 and is inserted into the rotating column 3; four adjusting slide rods 32 that are respectively movably inserted through the ends of the four first control rods 14; and a control structure that is set inside the rotating column 3 and controls the distance between the adjusting ring 31 and the end of the rotating column 3. The four adjusting slide rods 32 are respectively fixedly connected to the adjusting ring 31 at one end close to each other.

[0054] When the angle between the adjusting slide rod 32 and the end face of the rotating column 3 is 0 degrees or between 15 degrees and 30 degrees, and the angle between the adjusting slide rod 32 and the end face of the rotating column 3 is between 15 degrees and 30 degrees, the end of the adjusting slide rod 32 that is away from the adjusting ring 31 tilts downward.

[0055] In this embodiment, when the adjusting ring 31 moves under the action of the control structure, it drives the adjusting slide rod 32 to move synchronously. Since the adjusting slide rod 32 is movably connected through the first control rod 14, the movement of the adjusting slide rod 32 transmits force to the first control rod 14, causing the first control rod 14 to move along the length of the rod towards the rotating column 3, thereby driving the locking block 36 to move. This design can distribute the unidirectional force generated by the control structure to the four first control rods 14, so that the four locking blocks 36 can simultaneously and evenly apply force to the flange 5, ensuring that the flange 5 is stably fixed and avoiding displacement or deformation of the flange 5 during welding due to uneven force. Through the linkage of the adjusting ring 31 and the adjusting slide rod 32, the synchronous movement of the four locking blocks 36 can be achieved. When welding flanges 5 of different sizes, the position of the adjusting ring 31 can be adjusted by the control structure to make the four locking blocks 36 simultaneously move closer to or further away from the flange 5, quickly adapting to the fixing requirements of flanges 5 of different sizes, improving the versatility and operational efficiency of the device.

[0056] In this embodiment, when the angle between the adjusting slide rod 32 and the end face of the rotating column 3 is between 15 and 30 degrees, and the end of the adjusting slide rod 32 furthest from the adjusting ring 31 is tilted downwards, this design allows the locking block 36 to generate a downward component force in addition to providing a horizontal fixing force when fixing the flange 5. This downward component force can increase the fit between the flange 5 and the pipe body 4, making them more tightly joined together during welding, reducing the relative displacement between the flange 5 and the pipe body 4 caused by factors such as vibration or thermal stress, thereby improving the welding quality. The tilted adjusting slide rod 32 design can optimize the internal space layout of the device to a certain extent. When the internal space of the rotating column 3 is limited, by reasonably setting the tilt angle of the adjusting slide rod 32, the layout between various components can be made more compact, reducing space occupation, while avoiding interference between components, and improving the overall reliability and stability of the device.

[0057] The control structure controls the adjustment ring 31 to move along the length of the first control rod 14. This embodiment provides the following solution:

[0058] like Figure 5 As shown, the control structure includes a second adjusting rod 33 vertically disposed on the end face of the adjusting ring 31 away from the first control rod 14, a second lead screw 35 disposed along the axis of the rotating column 3 and threadedly connected to the second adjusting rod 33, and a second motor 34 disposed in the rotating column 3 and controlling the rotation of the second lead screw 35.

[0059] In this embodiment, the second motor 34 drives the second lead screw 35 to rotate, which in turn drives the adjusting ring 31 to move along the length of the first control rod 14 via the second adjusting rod 33 threadedly connected to the second lead screw 35, thereby facilitating the control of the adjusting ring 31 to move into the rotating column 3.

[0060] Example 3: For the concentric fixing of the pipe body 4 and the flange 5 by the fixing assembly, the following solution is provided in this example.

[0061] like Figures 7-8 As shown, a control groove 15 is provided at the center of the end of the rotating column 3. The fixing assembly includes a limiting block 17 set at the opening of the control groove 15 by a fixing rod 16, ball bearings 23 symmetrically arranged on the upper and lower symmetrical end faces of the limiting block 17 by a buffer, two fixing blocks 20 movably passing through the openings of the second fixing grooves 18 on the two symmetrical sides of the limiting block 17, and a fixing member set in the rotating column 3 to control the two fixing blocks 20 to move away from each other. The buffer pushes the two ball bearings 23 away from each other.

[0062] In this embodiment, when one end of the pipe body 4 is inserted into the flange 5, the inner sleeve of the pipe body 4 is fitted onto two ball bearings 23. The two ball bearings 23, which are positioned far apart from each other, are used to position the pipe body 4 within the flange 5. In addition, two fixing blocks 20, which are inserted into the second fixing groove 18 and are far apart from each other, abut against the inner wall of the pipe body 4, thereby achieving precise concentric fixing of the end of the pipe body 4 within the flange 5. This ensures the accuracy of subsequent laser welding, makes the weld uniform and beautiful, and improves the welding quality.

[0063] It is understandable that the two balls 23 can be pushed away from each other in various ways. This embodiment provides the following solution:

[0064] like Figure 7 As shown, the buffer includes two limiting telescopic rods 21 that are vertically set on the upper and lower symmetrical end faces of the limiting block 17, and a limiting spring 22 that is movably inserted through the body of the limiting telescopic rod 21 and connected to both ends. The opposite ends of the two limiting telescopic rods 21 are respectively rotatably connected to different balls 23.

[0065] In this embodiment, the elastic force of the limiting spring 22 on the limiting telescopic rod 21 pushes the two balls 23 away from each other. When the tube 4 is inserted into the flange 5, the inner wall of the tube 4 is fitted onto the two balls 23. At this time, the inner wall of the tube 4 squeezes the balls 23, pushing the balls 23 to move towards the limiting block 17 and compressing the limiting spring 22. Thus, the position of the tube 4 inserted into the flange 5 is positioned by the pushing force of the two balls 23 moving away from each other, so that the subsequent fixing component can drive the two fixing blocks 20 to move away from each other and fix the tube 4.

[0066] It is understandable that the two fixed blocks 20 can be controlled to move away from each other in various ways. This embodiment provides the following solution:

[0067] like Figure 8 and Figure 9 As shown, the fixing components include a linkage bar 19 that passes through the second fixing groove 18 and is located on one side between the two fixing blocks 20; a second control rod 27 that moves along the axis of the rotating column 3, passes through the limiting block 17, and has its end connected to the middle of the linkage bar 19; a fixing structure that controls the movement of the second control rod 27 along its length; and two fixed telescopic rods 29 that are symmetrically arranged in the second fixing groove 18 about the second control rod 27. One end of the two fixed telescopic rods 29 is rotatably arranged close to each other on the groove wall of the second fixing groove 18 away from the linkage bar 19, and the other end is rotatably connected to different fixing blocks 20 respectively. Fixed springs 30 are sleeved on the rod body of the fixed telescopic rods 29 to connect the two ends of the fixed telescopic rods 29. The two fixing blocks 20 are slidably arranged along the length of the linkage bar 19.

[0068] The linkage bar 19 has a linkage groove along its length on the side near the two fixed blocks 20. Two sliding rods 28 are slidably arranged in the linkage groove. The two sliding rods 28 are vertically fixed to different fixed blocks 20 at their ends away from each other.

[0069] In this embodiment, when the fixed structure controls the movement of the second control rod 27, the second control rod 27 drives the linkage bar 19 to move. The linkage groove on the linkage bar 19 guides the sliding rod 28 to slide, and the sliding rod 28 in turn drives the fixed block 20 to move. At the same time, the fixed telescopic rod 29 extends and retracts with the movement of the fixed block 20, and the fixed spring 30 provides elastic force assistance. This multi-component collaborative working method makes the movement of the fixed block 20 more stable and smooth, and can accurately reach the predetermined fixed position. Since the fixed block 20 can slide along the length of the linkage bar 19, and through the elastic adjustment of the fixed telescopic rod 29 and the fixed spring 30, the fixing component can adapt to the fixing requirements of flanges 5 and pipe bodies 4 of different sizes. For components with larger diameters, the second control rod 27 can drive the linkage bar 19 to move the fixed block 20 outward a greater distance, the fixed telescopic rod 29 extends, and the fixed spring 30 stretches, providing sufficient fixing force for the component; for components with smaller diameters, the movement distance of the fixed block 20 can be appropriately reduced to achieve flexible and precise fixing. During the welding process, the device may be affected by factors such as vibration and thermal stress. The elasticity of the fixed telescopic rod 29 and the fixed spring 30 can buffer these effects, reduce the loosening of the fixing block 20, and ensure that the flange 5 and the pipe body 4 are always in a stable fixed state. At the same time, the precise guidance of the sliding rod 28 in the linkage groove further enhances the reliability of the fixation, ensuring that the parts will not be displaced during the welding process, thereby improving the welding quality.

[0070] In this embodiment, when the linkage bar 19 is moved by the second control rod 27, the two fixed telescopic rods 29 will push the two fixed blocks 20 away from each other. At this time, the two fixed blocks 20 move away from each other and closer to the rotating column 3 relative to the limiting block 7, thereby clamping and fixing the pipe body 4 and pushing the end of the pipe body 4 to move towards the rotating column 3, which improves the stability and accuracy of the concentric fixation between the pipe body 4 and the flange 5.

[0071] It is understandable that the fixed structure can drive the second control lever 27 to move along its length in various ways. This embodiment provides the following solution:

[0072] like Figure 8 and Figure 9 As shown, the fixed structure includes a first adjusting rod 26 disposed on the end of the second control rod 27 along the length direction of the second control rod 27, a first lead screw 25 with one end threadedly connected and passing through the first adjusting rod 26, and a first motor 24 disposed in the rotating column 3 and driving the first lead screw 25 to rotate.

[0073] In this embodiment, the first motor 24 drives the first lead screw 25 to rotate, which in turn drives the second control rod 27 to move stably along the length of the rod via the first adjusting rod 26 threadedly connected to the first lead screw 25, thereby facilitating the movement of the linkage bar 19.

[0074] 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 preferred examples and are not intended to limit 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. A rotary laser welding device for automotive parts, comprising a fixing mechanism for fixing a flange (5) and an exhaust pipe body (4), and a laser welding mechanism for welding the fixed pipe body (4) and flange (5), characterized in that, The fixing mechanism includes a rotating column (3) set on the reciprocating rotating assembly, four limiting rods (12) slidably set on the end face of the rotating column (3) through elastic components, four locking blocks (36) set on the rod body of the limiting rods (12) in a one-to-one correspondence, a control component that controls the four locking blocks (36) to move along the rod body of the limiting rods (12), and a fixing component set on the rotating column (3) and concentrically fixing the end of the inner tube (4) of the flange (5). The limiting rod (12) is composed of a vertical rod set perpendicular to the end face of the rotating column (3) and an inclined rod set on the end of the first rod body away from the rotating column (3). The four inclined rods are respectively facing away from the four vertical rods, and the angle between the inclined rod and the end face of the rotating column (3) is between 15 degrees and 30 degrees. Before welding, the flange (5) is inserted between the four inclined rods, pushing the four inclined rods away from each other and compressing the elastic component. The flange (5) is inserted between the four vertical rods and positioned and fitted with the end of the rotating column (3). The control component drives the four locking blocks (36) to move towards the flange (5) along the direction of the limit rod (12) to fix the flange (5). The end of the pipe body (4) is inserted into the flange (5), and the fixing component fixes the pipe body (4) and the flange (5) concentrically. During welding, the reciprocating rotating component drives the rotating column (3) to reciprocate around the axial direction, and the laser welding mechanism welds between the pipe body (4) and the flange (5).

2. The rotary laser welding apparatus for automotive parts according to claim 1, characterized in that: The rotating column (3) has four positioning grooves (8) with the length direction of the opening facing the center of the end. The elastic component includes four positioning slide rods (9) passing through different positioning grooves (8), positioning sliders (11) slidingly sleeved on the rod of the positioning slide rod (9), and positioning springs (10) sleeved on the rod of the positioning slide rod (9). The four positioning springs (10) are respectively located at the positions where the four positioning sliders (11) are far apart from each other. When the four positioning springs (10) are in the normal extension state, the four positioning sliders (11) are located on the rod of the four positioning slide rods (9) close to each other. The four positioning sliders (11) are respectively connected to the vertical rods of different limiting rods (12).

3. The rotary laser welding apparatus for automotive parts according to claim 1 or 2, characterized in that: The control assembly includes a fixed slider that passes through a first fixed groove (13) on one side of the limit rod (12), a first control rod (14) with one end connected to a locking block (36) and the other end perpendicularly passing through the end of the rotating column (3), and a control component that is set in the rotating column (3) and drives the first control rod (14) to move along the length of the rod. The locking block (36) is connected to the fixed slider.

4. The rotary laser welding apparatus for automotive parts according to claim 3, characterized in that: The control components include an adjusting ring (31) that passes through the end of the parallel rotating column (3) and is inserted into the rotating column (3), four adjusting slide rods (32) that are respectively movably inserted through the ends of the four first control rods (14), and a control structure that is set inside the rotating column (3) and controls the distance between the adjusting ring (31) and the end of the rotating column (3). The four adjusting slide rods (32) are fixedly connected to the adjusting ring (31) at one end close to each other. When the angle between the adjusting slide rod (32) and the end face of the rotating column (3) is 0 degrees or between 15 degrees and 30 degrees, the end of the adjusting slide rod (32) that is far from the adjusting ring (31) tilts downward.

5. The rotary laser welding apparatus for automotive parts according to claim 4, characterized in that: The control structure includes a second adjusting rod (33) vertically disposed on the end face of the adjusting ring (31) away from the first control rod (14), a second lead screw (35) disposed along the axis of the rotating column (3) and threadedly connected to the second adjusting rod (33), and a second motor (34) disposed in the rotating column (3) and controlling the rotation of the second lead screw (35).

6. The rotary laser welding apparatus for automotive parts according to claim 1, characterized in that: A control groove (15) is provided at the center of the end of the rotating column (3). The fixing component includes a limiting block (17) set at the opening of the control groove (15) by a fixing rod (16), a ball (23) symmetrically set on the upper and lower symmetrical end faces of the limiting block (17) by a buffer, two fixing blocks (20) movably passing through the openings of the second fixing grooves (18) on the two symmetrical sides of the limiting block (17), and a fixing component set in the rotating column (3) and controlling the two fixing blocks (20) to move away from each other. The buffer pushes the two ball (23) to move away from each other.

7. The rotary laser welding apparatus for automotive parts according to claim 6, characterized in that: The buffer includes two limiting telescopic rods (21) that are vertically set on the upper and lower symmetrical end faces of the limiting block (17), and a limiting spring (22) that is movably inserted through the body of the limiting telescopic rod (21) and connected to both ends. The opposite ends of the two limiting telescopic rods (21) are respectively rotatably connected to different balls (23).

8. The rotary laser welding apparatus for automotive parts according to claim 6, characterized in that: The fixing components include a linkage bar (19) that passes through the second fixing groove (18) and is located on one side between the two fixing blocks (20); a second control rod (27) that moves along the axis of the rotating column (3) and passes through the limiting block (17) and whose end is connected to the middle of the linkage bar (19); a fixing structure that controls the second control rod (27) to move along the length direction; and two fixed telescopic rods (29) that are symmetrically arranged in the second fixing groove (18) about the second control rod (27). One end of the two fixed telescopic rods (29) is close to each other and rotated on the groove wall of the second fixing groove (18) away from the linkage bar (19), and the other end is rotatably connected to different fixing blocks (20); a fixed spring (30) is sleeved on the rod body of the fixed telescopic rod (29) to connect the two ends of the fixed telescopic rod (29); and the two fixing blocks (20) are slidably arranged along the length direction of the linkage bar (19).

9. The rotary laser welding apparatus for automotive parts according to claim 8, characterized in that: The linkage bar (19) has a linkage groove along its length on one side near the two fixed blocks (20). Two sliding rods (28) are slidably installed in the linkage groove. The two sliding rods (28) are perpendicularly fixed to different fixed blocks (20) at one end away from each other.

10. The rotary laser welding apparatus for automotive parts according to claim 9, characterized in that: The fixed structure includes a first adjusting rod (26) disposed on the end of the second control rod (27) along the length direction of the second control rod (27), a first lead screw (25) with one end threadedly connected to the first adjusting rod (26), and a first motor (24) disposed in the rotating column (3) and driving the first lead screw (25) to rotate.

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