A multi-point automotive parts welding device

Abstract

The application discloses a kind of multi-point automobile accessory welding device, belong to automobile accessory laser welding technical field.This device includes the equipment rack with guide rail, and at least two independently arranged welding modules.Welding module includes the base slide of sliding installation on guide rail, pressing assembly and welding assembly.Pressing assembly is fixed on welding assembly, including pressing drive and the pressing rod of front end with limit ball head in socket, and elastic limit ring is arranged at the opening of socket.Welding assembly is fixed on base slide, including laser welding head with ball head parallel arrangement.It realizes the multi-point synchronous pressing and welding of curved surface automobile accessory such as sheet metal which is easy to produce welding deformation, effectively solves the problem that welding device is difficult to adapt to curved surface change in prior art, pressing and welding position is easy to deviate, significantly improves welding precision and efficiency.

Description

Technical Field

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

[0002] In the automobile manufacturing process, many parts, such as door panels and chassis structural components, need to be connected by welding. With the development of lightweighting and structural complexity in automobiles, these parts often have complex curved surfaces and numerous, widely distributed welding points.

[0003] Existing welding equipment mostly employs single-point welding, meaning it operates on only one weld point at a time. For multi-point components, this requires frequent movement of the workpiece or welding torch, resulting in low efficiency and difficulty in ensuring consistent weld point positions. While some multi-point welding equipment has multiple welding torches, it cannot uniformly and stably clamp complex curved workpieces before welding, easily leading to workpiece displacement during welding and affecting weld quality. Furthermore, rigid pressure heads, when contacting curved workpieces, are prone to localized excessive or insufficient clamping force, causing interference between the welding position and the clamping area, making it difficult to guarantee weld point accuracy.

[0004] Therefore, there is an urgent need for an automotive parts welding device that can adapt to complex curved surfaces, achieve multi-point synchronous and precise pressing and welding, and has a compact structure and reliable positioning. Summary of the Invention

[0005] The present invention aims to solve the problems of existing welding devices being difficult to adapt to complex curved workpieces, easy interference between clamping and welding positions, and low efficiency of multi-point welding, and provides a multi-point welding device for automotive parts.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a multi-point automotive parts welding device, comprising a frame and at least two independently configured welding modules. The frame is equipped with guide rails. Each welding module includes a base slider, a clamping assembly, and a welding assembly. The base slider is slidably mounted on the guide rails. The clamping assembly is fixed to the welding assembly. The clamping assembly includes a clamping drive and a clamping rod. The clamping rod is connected to the clamping drive. The front end of the clamping rod is provided with a ball head and a socket. The ball head is confined within the socket. An elastic limiting ring is provided at the opening of the socket. The welding assembly is fixed to the base slider. The welding assembly includes a laser welding head. The laser welding head and the ball head are arranged side by side with a heat dissipation gap. In the non-working state, the bottom surface of the ball head is lower than the laser welding head's light outlet. In the working state, the focal point of the laser welding head is located beside the ball head's clamping area.

[0007] Furthermore, a protective plate is provided on the side of the ball head facing the laser welding head. The protective plate has multiple pores.

[0008] Furthermore, a compression spring is provided between the clamping rod and the clamping drive component. An adjusting nut is provided at one end of the compression spring. The adjusting nut has a circumferentially oriented positioning hole. A pin is installed in the positioning hole. When the pin is inserted into the positioning hole, it locks the rotational position of the adjusting nut.

[0009] Furthermore, the ball head is a rigid component. The ball head shape can be arc-shaped, spherical, or contoured.

[0010] Furthermore, the ball head and the elastic limiting ring form a cavity. A quick-change interface is provided between the ball socket and the clamping rod. A protective gas passage is provided at the quick-change interface of the cavity.

[0011] Furthermore, the inner surface of the ball socket has multiple micropores. Each micropore is connected to a protective gas channel. The total area A of the micropores is determined by the preload F of the elastic retaining ring and the interference fit between the ball head and the elastic retaining ring. The gas supply pressure P of the protective gas passage is determined by the following formula:

[0012]

[0013] Where d is the diameter of the ball head; the preload F of the elastic limiting ring ranges from 50N to 200N; interference fit The value ranges from 0.02mm to 0.1mm; the air supply pressure P ranges from 0.2MPa to 0.6MPa; and the ball head diameter d ranges from 10mm to 40mm.

[0014] Furthermore, the inner edge of the elastic limiting ring is provided with a tapered sealing surface extending towards the ball head. The tapered sealing surface is interference-fitted with the outer spherical surface of the ball head. The cone angle of the tapered sealing surface matches the tangential direction of the spherical surface of the ball head during rotation. This is used to maintain sealing contact when the ball head deflects.

[0015] Furthermore, an elastic washer is provided between the bottom of the ball socket and the ball head. The elastic washer contacts the spherical surface of the ball head. It is used to provide initial preload when the conformal indenter clamps the workpiece and to provide reset torque when the conformal indenter deflects.

[0016] Furthermore, the base slider also includes a traveling roller. The outer contour of the traveling roller is an annular groove that matches the cross-section of the guide rail.

[0017] Furthermore, the base slider is equipped with a retractable retaining pin. The bottom end of the retaining pin is provided with a tapered guide.

[0018] Beneficial effects:

[0019] 1. The welding points can be flexibly adjusted to achieve multi-point synchronous welding of automotive parts, adapting to the welding needs of parts of different specifications and greatly improving welding processing efficiency.

[0020] 2. This invention enables multi-point synchronous pressing and welding of complex curved automotive parts, effectively solving the problems of welding devices being unable to adapt to surface changes and the pressing and welding positions being prone to shifting in the prior art, thus significantly improving welding accuracy and efficiency.

[0021] 3. The integrated welding protection structure can effectively protect the welding area, prevent oxidation of the welding area, and significantly improve the welding quality and finished product qualification rate of automotive parts. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 for Figure 1 A magnified view of part A in the image; Figure 3 This is a schematic diagram of the welding module structure in an embodiment of the present invention; Figure 4 for Figure 3 A magnified view of part M; Figure 5 This is a schematic diagram of the fixing pin structure in an embodiment of the present invention; Figure 6 for Figure 3 A magnified view of N in the middle; Figure 7 This is a schematic diagram of the structure of the ball head and the ball socket in an embodiment of the present invention; Figure 8 This is a schematic elevation view of the ball head and ball socket in an embodiment of the present invention.

[0023] The components include: 1. Equipment frame; 11. Guide rail; 2. Welding module; 21. Base slider; 211. Traveling roller; 212. Fixing pin; 2121. Conical guide; 22. Clamping assembly; 221. Clamping drive; 222. Clamping rod; 223. Ball head; 224. Ball socket; 2241. Microhole; 2242. Quick-change interface; 225. Elastic limit ring; 226. Protective plate; 227. Air hole; 228. Compression spring; 229. Adjusting nut; 2291. Positioning hole; 2292. Elastic gasket; 23. Welding assembly; 231. Laser welding head. Detailed Implementation

[0024] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0025] See Figures 1 to 8According to the present invention, a multi-point automotive parts welding device includes a frame 1 and at least two independently arranged welding modules 2. The frame 1 is provided with a guide rail 11. The welding module 2 includes a base slider 21, a clamping assembly 22, and a welding assembly 23. The base slider 21 is slidably mounted on the guide rail 11. The clamping assembly 22 is fixed to the welding assembly 23. The clamping assembly 22 includes a clamping drive 221 and a clamping rod 222. The clamping rod 222 is connected to the clamping drive 221. The front end of the clamping rod 222 is provided with a ball head 223 and a ball socket 224. The ball head 223 is confined within the ball socket 224. An elastic limiting ring 225 is provided at the opening of the ball socket 224. The welding assembly 23 is fixed to the base slider 21. The welding assembly 23 includes a laser welding head 231. The laser welding head 231 and the ball head 223 are arranged side by side with a heat dissipation gap. In the non-working state, the bottom surface of the ball head 223 is lower than the light outlet of the laser welding head 231. In the working state, the focal point of the laser welding head 231 is located beside the pressing area of ​​the ball head 223.

[0026] Function description: The equipment frame 1 provides a stable installation and support foundation for the entire welding device, solving the problem of the lack of a stable carrier for the installation and positioning of the welding module 2.

[0027] The guide rail 11 provides guidance and support for the position adjustment of the welding module 2, enabling the welding module 2 to slide and move flexibly on the equipment frame 1, adapting to the layout requirements of different welding points.

[0028] At least two independently configured welding modules 2 can realize simultaneous welding operations at multiple points of automotive parts, greatly improving welding processing efficiency. At the same time, each welding module 2 can independently adjust its position and working parameters to adapt to the welding needs of automotive parts of different specifications.

[0029] The base slider 21 is slidably mounted on the guide rail 11, which realizes the position adjustment of the welding module 2 as a whole on the guide rail 11, and solves the problem that the welding point position is fixed and cannot be flexibly adjusted.

[0030] The clamping component 22 is fixed on the welding component 23, which can clamp and position the workpiece around the welding area before welding to prevent the workpiece from shifting during welding and ensure welding accuracy.

[0031] The clamping drive 221 provides driving force for the lifting and lowering action of the clamping rod 222, realizing automatic control of the clamping and loosening actions, and adapting to the operation requirements of automated welding. The clamping rod 222 is connected to the clamping drive 221 and can transmit the power of the clamping drive 221 to the ball head 223 at the front end, providing a stable force transmission structure for workpiece clamping.

[0032] The ball head 223 is confined within the ball socket 224, and can achieve multi-directional adaptive deflection within the ball socket 224 to conform to the surface of workpieces of different shapes, thereby achieving conformal clamping and solving the problem that rigid pressure heads cannot adapt to irregular workpiece surfaces and cannot clamp properly.

[0033] The ball socket 224 provides a limiting and installation space for the ball head 223, ensuring that the ball head 223 can stably achieve deflection action, while also providing support for the ball head 223.

[0034] The elastic limiting ring 225 set at the opening of the ball socket 224 can axially limit the ball head 223 to prevent the ball head 223 from coming out of the ball socket 224. At the same time, it can generate elastic deformation in conjunction with the deflection action of the ball head 223 to ensure that the ball head 223 always maintains a sealed fit during the deflection process.

[0035] The welding assembly 23 is fixed on the base slider 21, providing the core execution structure for laser welding operations and enabling laser welding processing of automotive parts.

[0036] The laser welding head 231 is the core component of laser welding, capable of outputting a focused laser beam to achieve precise welding of the workpiece. The laser welding head 231 is arranged side by side with the ball head 223 and has a heat dissipation gap, which can prevent the ball head 223 from being thermally deformed due to the high temperature generated by laser welding, and at the same time prevent welding spatter from adhering to the ball head 223, ensuring the long-term stable use of the clamping structure.

[0037] In the non-working state, the laser welding head 223 is not in operation. In this state, the bottom surface of the ball head 223 is lower than the light outlet of the laser welding head 231. This can isolate the light outlet of the laser welding head 231 in the non-working state of the device, avoid spatter at the welding point, and at the same time ensure that the clamping action is performed before the welding action, realizing the operation logic of clamping before welding.

[0038] In the working state, the focus of the laser welding head 231 is located next to the pressing area of ​​the ball head 223. The pressing area refers to the area within 10cm of the laser welding head 223. This ensures that the welding area is within the pressing and positioning range, avoiding warping or displacement of the workpiece during the welding process, and effectively improving welding accuracy and welding quality.

[0039] See Figures 1 to 3 , Figure 6 According to the multi-point automotive parts welding device provided by the present invention, a protective plate 226 is provided on the side of the ball head 223 facing the laser welding head 231. The protective plate 226 has multiple pores 227. The protective plate 226 can block the spatter generated during the welding process, forming physical protection. At the same time, the multiple pores 227 on the protective plate 226 are conducive to heat dissipation and improve the quality of the welded joint.

[0040] See Figures 1 to 3 , Figure 6 According to the multi-point automotive parts welding device provided by the present invention, a compression spring 228 is provided between the clamping rod 222 and the clamping drive component 221. One end of the compression spring 228 is provided with an adjusting nut 229. The adjusting nut 229 has a circumferentially oriented positioning hole 2291, and a pin is installed in the positioning hole 2291. When the pin is inserted into the positioning hole 2291, the rotational position of the adjusting nut 229 is locked. The compression spring 228 provides elastic buffering for the clamping action, preventing rigid clamping from causing damage to the workpiece surface. It can also adapt to workpieces of different thicknesses, ensuring stable output of clamping force. The adjusting nut 229 can adjust the pre-compression of the compression spring 228, achieving flexible adjustment of the clamping force to meet the clamping requirements of workpieces of different materials and specifications. The circumferential positioning hole 2291 of the adjusting nut 229, in conjunction with the pin, can lock the rotational position of the adjusting nut 229, preventing loosening and displacement of the adjusting nut 229 during operation, and ensuring the stability and consistency of the clamping force.

[0041] See Figures 7 to 8 According to the multi-point automotive parts welding device provided by the present invention, the ball head 223 is a rigid component, and the ball head 223 is in the form of an arc surface, a spherical surface, or a contoured shape. The rigid structure of the ball head 223 can ensure the stable transmission of clamping force, avoid deformation during clamping, and ensure the accuracy of clamping positioning; the arc surface, spherical surface, or contoured shape design can adapt to workpieces with different surface morphologies, further improving the adaptability of conformal clamping and ensuring effective contact and clamping of the workpiece surface.

[0042] See Figures 7 to 8 According to the multi-point automotive parts welding device provided by the present invention, a ball head 223 and an elastic limiting ring 225 form a cavity, and a quick-change interface 2242 is provided between a ball socket 224 and a clamping rod 222. A protective gas channel is provided at the quick-change interface 2242 in the cavity. The cavity formed by the ball head 223 and the elastic limiting ring 225 can serve as an auxiliary outlet for the protective gas, preventing spatter from adhering to the ball head 223 and causing damage to the ball head 223, while also improving the welding quality of the welding area. The quick-change interface 2242 enables rapid replacement of the ball socket 224 and ball head 223 components, adapting to the clamping requirements of different workpieces and improving the device's changeover efficiency. The protective gas channel provides a delivery path for the protective gas. The clamping rod 222 is made of hollow material, enabling stable delivery of the protective gas from the gas source to the front end of the clamping component, providing a gas source guarantee for the protection of the welding area.

[0043] See Figures 1 to 8 According to the multi-point welding device for automotive parts provided by the present invention, a plurality of microholes 2241 are formed on the inner surface of the ball socket 224. Each microhole 2241 is connected to a protective gas channel. The total area A of the microholes 2241 is determined by the preload F of the elastic limiting ring 225 and the interference fit between the ball head 223 and the elastic limiting ring 225. The gas supply pressure P of the protective gas passage is determined by the following formula:

[0044] Where d is the diameter of the ball head 223. The preload F of the elastic limiting ring 225 ranges from 50N to 200N. Interference fit The value ranges from 0.02 mm to 0.1 mm. The gas supply pressure P ranges from 0.2 MPa to 0.6 MPa. The diameter d of the ball head 223 ranges from 10 mm to 40 mm. This formula enables precise quantitative design of the total area of ​​the micropore 2241, ensuring that the output flow rate of the protective gas is precisely matched with the structural and operating parameters of the device. This guarantees that the protective gas can form a stable gas film seal at the mating surface of the ball head 223 and the ball socket 224, while providing sufficient protective gas to the welding area, avoiding waste due to excessive flow rate or ineffective protection due to insufficient flow rate.

[0045] The preload F of the elastic retaining ring 225 is the initial clamping force applied by the elastic retaining ring 225 to the ball head 223, which ensures the initial positioning stability of the ball head 223 and provides a basic preload for the sealing of the mating surfaces. The interference fit between the ball head 223 and the elastic retaining ring 225... This prevents the ball head 223 from falling out during use. The supply pressure P of the protective gas channel is the working pressure of the protective gas in the delivery channel, providing power for the output of the protective gas. At the same time, it can form a gas film lubrication on the mating surface of the ball head 223 and the ball socket 224, reducing the frictional resistance when the ball head 223 deflects. The diameter d of the ball head 223 is the nominal diameter of the spherical surface of the ball head 223, which determines the contact area between the ball head 223 and the workpiece, and also affects the deflection range and load-bearing capacity of the ball head 223.

[0046] The preload F of the elastic limiting ring 225 ranges from 50N to 200N. If the preload F is less than 50N, it cannot effectively clamp and limit the ball head 223, easily leading to loosening of the ball head 223 and seal failure. If the preload F is greater than 200N, the frictional resistance during ball head 223 deflection will be too high, preventing adaptive conformal deflection and affecting the clamping effect. A preload of 120N is preferred, balancing the positioning stability and deflection flexibility of the ball head 223. Interference allowance. The value ranges from 0.02mm to 0.1mm. Interference allowance. A diameter less than 0.02mm indicates insufficient sealing performance in non-ventilated conditions, which can easily lead to leakage of protective gas. Interference allowance. A diameter greater than 0.1 mm will cause excessive deformation of the ball head 223, leading to fatigue damage and increased deflection resistance. A diameter of 0.05 mm is preferred, balancing sealing performance and deflection flexibility of the ball head 223. The supply gas pressure P ranges from 0.2 MPa to 0.6 MPa. A supply gas pressure P less than 0.2 MPa cannot form a stable air curtain protection, making the welding area prone to oxidation defects and failing to provide effective gas film lubrication for the mating surfaces of the ball head 223. A supply gas pressure greater than 0.6 MPa will result in excessive protective gas flow, wasting gas resources, and excessive pressure will affect the stability of the weld pool, reducing welding quality. A diameter of 0.4 MPa is preferred, balancing welding protection and weld pool stability. The diameter d of the ball head 223 ranges from 10 mm to 40 mm. A diameter d less than 10 mm results in too small a contact area between the ball head 223 and the workpiece, easily causing surface damage during clamping, and insufficient load-bearing capacity, failing to provide stable clamping force. When the diameter d is greater than 40mm, the deflection flexibility of the ball head 223 decreases, making it unable to adapt to workpiece surfaces with large curvature changes. It also occupies excessive installation space, affecting the layout of the laser welding head 231. A diameter of 20mm is preferred, balancing clamping stability with conformal deflection adaptability.

[0047] Formula design example: This formula is used for structural design values ​​in the welding operation of automotive door sheet metal parts. Automotive door sheet metal is a common processed workpiece in automotive parts welding. Conventional welding conditions and equipment adaptation operating parameters are used as the design basis. Substituting them into the formula, the design values ​​that fit the actual industrial situation can be directly obtained. The specific values ​​and calculation process are as follows: The preload force F of the elastic limit ring 225 is selected as the preferred value of 120N, and the interference fit is... The preferred values ​​are 0.05 mm, 0.4 MPa for the gas supply pressure P, and 20 mm for the diameter d of the ball head 223. Substituting these values ​​into the formula, the total area A of the micro-hole 2241 is calculated as follows: A = (120 N × 0.05 mm) / (0.4 MPa × 20 mm) = 6 / 8 = 0.75 mm². The theoretical value calculated by this formula is 0.75 mm². Based on the industrial manufacturing standards for automotive parts welding equipment, six 0.4 mm diameter micro-holes 2241 can be used. The area of ​​a single micro-hole is approximately 0.1256 mm², and the total area of ​​the six micro-holes 2241 is approximately 0.7536 mm², which highly matches the theoretical calculation value and meets the protection requirements of actual welding operations.

[0048] See Figures 7 to 8According to the multi-point automotive parts welding device provided by the present invention, the inner edge of the elastic limiting ring 225 is provided with a conical sealing surface extending towards the ball head 223. The conical sealing surface is interference-fitted with the outer spherical surface of the ball head 223. The cone angle of the conical sealing surface matches the tangential direction of the spherical surface of the ball head 223 when it rotates. This is used to maintain sealing contact when the ball head 223 deflects. The conical sealing surface can increase the contact area between the elastic limiting ring 225 and the ball head 223, improve the sealing performance, and at the same time, the cone angle matches the tangential direction of the spherical surface of the ball head 223 when it rotates, which can ensure that the conical sealing surface always maintains close contact with the outer spherical surface of the ball head 223 at any deflection angle, avoiding sealing failure and protective gas leakage during the deflection of the ball head 223, and ensuring the stability of welding protection.

[0049] See Figures 7 to 8 According to the multi-point automotive parts welding device provided by the present invention, an elastic washer 2292 is provided between the bottom of the ball socket 224 and the ball head 223. The elastic washer 2292 contacts the spherical surface of the ball head 223. It is used to provide initial preload when the conformal indenter clamps the workpiece and to provide reset torque when the ball head 223 deflects. The elastic washer 2292 can work together with the compression spring 228 to provide preload when the ball head 223 clamps the workpiece, ensuring the fit between the ball head 223 and the workpiece surface, and at the same time buffering the impact load during the clamping process to avoid damage to the workpiece surface; when the ball head 223 deflects with the workpiece surface, the elastic washer 2292 can generate corresponding elastic deformation, providing reset torque for the ball head 223, ensuring that after welding is completed and the clamping force is removed, the ball head 223 can automatically return to the initial position, preparing for the next clamping operation.

[0050] See Figure 1 and Figure 4 According to the multi-point automotive parts welding device provided by the present invention, the base slider 21 further includes a traveling roller 211, the outer contour of which is an annular groove matching the cross-section of the guide rail 11. The traveling roller 211 can convert the sliding friction between the base slider 21 and the guide rail 11 into rolling friction, which greatly reduces the resistance when adjusting the position of the welding module 2, making the displacement adjustment of the welding module 2 smoother and more precise; the annular groove matching the cross-section of the guide rail 11 can form a lateral limit on the traveling roller 211, preventing the traveling roller 211 from falling off the guide rail 11, ensuring the stability of the welding module 2 during the displacement process, and avoiding positional deviation.

[0051] See Figure 1 and Figure 2According to the multi-point automotive parts welding device provided by the present invention, a retractable fixing pin 212 is provided on the base slider 21. The bottom end of the fixing pin 212 is provided with a tapered guide portion 2121. After the welding module 2 is adjusted to the target position, the retractable fixing pin 212 can be inserted into the corresponding hole on the guide rail 11 to lock the position of the welding module 2, avoid displacement of the welding module 2 during the welding operation, and ensure the accuracy of the welding point. The tapered guide portion 2121 at the bottom end of the fixing pin 212 can provide a guiding function when the fixing pin 212 is extended, reduce the alignment accuracy requirements between the fixing pin 212 and the hole, and allow the fixing pin 212 to be smoothly inserted into the hole, thereby improving the efficiency and reliability of the position locking.

[0052] Explanation of the implementation process and principle of this invention:

[0053] In use, this device first adjusts the position of each welding module 2 on the guide rail 11 of the equipment frame 1 according to the welding point distribution of the automotive parts to be welded, so that the laser welding head 231 of each welding module 2 corresponds to the welding point. After adjustment, the position of the welding module 2 is locked by the telescopic fixing pin 212 on the base slider 21. Then, the automotive parts to be welded are fixed on the tooling position of the device, the device is started, and the clamping drive 221 drives the clamping rod 222 to move downward. The ball head 223 first contacts the surface of the workpiece and adaptively deflects in the ball socket 224 according to the shape of the workpiece surface, so as to achieve conformal fitting with the surface of the workpiece and form a stable clamping around the welding area. After clamping is in place, the laser welding head 231 is started and outputs a laser beam to perform welding operations on the workpiece. At the same time, the protective gas is delivered through the protective gas channel and output through the micropores 2241 in the ball socket 224 and the air holes 227 of the protective plate 226, forming a stable air curtain protection in the welding area to avoid oxidation of the welding area. After welding is completed, the laser welding head 231 stops working, and the clamping drive 221 drives the clamping rod 222 to rise and reset. The ball head 223 returns to its initial position under the reset torque of the elastic washer 2292, completing a single welding operation. For workpieces of different specifications, the clamping force can be adjusted by adjusting the nut 229, or the ball head 223 assembly of the corresponding specification can be quickly replaced by the quick-change interface 2242 to adapt to different processing requirements.

[0054] The specific embodiments described above do not constitute a limitation on the scope of protection of this application. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A multi-point welding device for automotive parts, characterized in that, include: The equipment frame is equipped with guide rails; At least two independently configured welding modules include a base slider, a clamping assembly, and a welding assembly. The base slider is slidably mounted on the guide rail. The clamping assembly is fixed to the welding assembly. The clamping assembly includes a clamping drive and a clamping rod. The clamping rod is connected to the clamping drive. The front end of the clamping rod is provided with a ball head and a ball socket. The ball head is confined within the ball socket. An elastic limiting ring is provided at the opening of the ball socket. The welding assembly is fixed to the base slider. The welding assembly includes a laser welding head. The laser welding head and the ball head are arranged side by side. In the non-working state, the bottom surface of the ball head is lower than the light output port of the laser welding head. In the working state, the focal point of the laser welding head is located beside the clamping area of ​​the ball head.

2. The multi-point automotive parts welding device according to claim 1, characterized in that, The ball head is provided with a protective plate on the side facing the laser welding head, and the protective plate has multiple air holes.

3. The multi-point automotive parts welding device according to claim 1, characterized in that, A compression spring is provided between the clamping rod and the clamping drive component. One end of the compression spring is provided with an adjusting nut. The adjusting nut is provided with a positioning hole along the circumference. A pin is installed in the positioning hole. When the pin is inserted into the positioning hole, the rotational position of the adjusting nut is locked.

4. The multi-point automotive parts welding device according to claim 1, characterized in that, The ball head is a rigid component, and its shape is arc-shaped, spherical, or contoured.

5. The multi-point automotive parts welding device according to claim 1, characterized in that, The ball head and the elastic limiting ring form a cavity, and a quick-change interface is provided between the ball socket and the clamping rod. A protective gas channel is provided at the quick-change interface of the cavity.

6. The multi-point automotive parts welding device according to claim 5, characterized in that, The inner surface of the ball socket has multiple micropores, each of which is connected to the protective gas channel. The total area A of the micropores is determined by the preload F of the elastic limiting ring and the interference fit between the ball head and the elastic limiting ring. The supply pressure P of the protective gas channel is determined by the following formula: ； Where d is the diameter of the ball head; the preload F of the elastic limiting ring ranges from 50N to 200N; and the interference fit... The value ranges from 0.02mm to 0.1mm, the air supply pressure P ranges from 0.2MPa to 0.6MPa, and the ball head diameter d ranges from 10mm to 40mm.

7. The multi-point automotive parts welding device according to claim 1, characterized in that, The inner edge of the elastic limiting ring is provided with a conical sealing surface extending toward the ball head, and the conical sealing surface is interference-fitted with the outer spherical surface of the ball head.

8. The multi-point automotive parts welding device according to claim 1, characterized in that, An elastic pad is provided between the bottom of the ball socket and the ball head, and the elastic pad is in contact with the spherical surface of the ball head.

9. A multi-point automotive parts welding device according to claim 1, characterized in that, The base slider also includes a traveling roller, the outer contour of which is an annular groove matching the cross-section of the guide rail.

10. A multi-point automotive parts welding device according to claim 1, characterized in that, The base slider is provided with a retractable fixing pin, and the bottom end of the fixing pin is provided with a tapered guide.

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