Multi-contact clamping device for laser lap welding of non-planar parts and laser welding equipment

Abstract

The invention discloses a multi-contact clamping device for laser lap welding of non-planar parts and laser welding device.The multi-contact clamping device for laser lap welding of non-planar parts comprises an upper box body and a lower box body, a plurality of upper piston assemblies are arranged in the upper box body, each upper piston assembly comprises an upper clamping contact, and a plurality of lower clamping contacts are arranged in the lower box body; the upper box body is internally provided with an upper gas path system which is communicated with the upper piston assembly, the lower box body is internally provided with a plurality of lower piston assemblies which comprise lower clamping contacts, the lower box body is internally provided with a lower gas path system which is communicated with the lower piston assemblies; the laser welding equipment comprises the multi-contact clamping device for laser lap welding of the non-planar part. The multi-contact clamping device for laser lap welding of the non-planar part and the laser welding equipment have the advantages of being simple in structure, low in implementation difficulty, low in implementation cost, high in universality, good in clamping stability, high in clamping precision and the like, and the welding quality can be effectively improved in practical application.

Description

Technical Field

[0001] This invention relates to the field of laser welding, and in particular to a multi-touch clamping device and laser welding equipment for laser lap welding of non-planar parts. Background Technology

[0002] In modern industrial production, material joining is an extremely critical processing step, and its importance is increasingly prominent. In particular, dissimilar material joining technology has shown greater advantages in effectively combining workpieces made of different materials, becoming a core element driving industrial innovation. From the miniaturized precision assembly of electronic products to the manufacturing of large and complex structural components in the aerospace field, dissimilar material joining technology plays an indispensable role.

[0003] Laser bonding technology, with its unique advantages such as highly concentrated energy, non-contact processing, small heat-affected zone, and high bonding precision, has stood out among numerous material bonding technologies, becoming one of the preferred technologies in modern high-end manufacturing. In the electronics manufacturing field, laser bonding enables high-precision, high-reliability connections between chips and substrates, ensuring the high performance and stability of electronic products. In the automotive manufacturing industry, laser bonding can be used to connect body parts made of different materials, effectively reducing body weight, improving fuel economy, while ensuring the strength and safety of the body structure.

[0004] Despite significant progress in laser joining technology, numerous challenges remain in practical applications. Firstly, the vast differences in physical and chemical properties of dissimilar materials, such as coefficients of thermal expansion, melting points, electrical conductivity, and chemical reactivity, easily lead to a series of problems during laser joining. Differences in thermal expansion coefficients can cause interfacial thermal stress during welding, potentially inducing cracks at the joint and severely impacting the reliability of the connection and the long-term stability of the structure. Differences in melting points make it difficult to achieve simultaneous melting of both materials during laser energy input, easily resulting in one material overheating while the other under-melts, thus affecting the quality and performance of the joint. Secondly, achieving precise positioning and stable clamping for workpieces with complex shapes or high precision requirements has always been a difficult problem in the industry. Traditional fixing methods often fail to meet the stringent requirements of laser joining for workpiece positional accuracy and interfacial stability, leading to workpiece displacement, warping, or excessively large gaps during welding, resulting in weld defects such as incomplete welds, missed welds, and uneven welds, severely impacting product quality and production efficiency.

[0005] In view of this, the purpose of the present invention is to provide a new technical solution to overcome the existing technical defects. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, the present invention provides a multi-contact clamping device and laser welding equipment for laser lap welding of non-planar parts, which effectively solves the technical defects of the existing clamping stability, low positioning accuracy, and impact on welding quality and production efficiency.

[0007] The technical solution adopted by this invention to solve its technical problem is:

[0008] A multi-contact clamping device for laser lap welding of non-planar parts includes an upper housing and a lower housing that are mutually matched. The upper housing has a downward-opening upper laser processing cavity and multiple upper piston assemblies, each including an upper clamping contact capable of piston movement. The upper housing also has an upper air passage system that is connected to the upper piston assemblies and drives the upper clamping contacts of the upper piston assemblies to perform piston movement. The lower housing has an upward-opening lower laser processing cavity and multiple lower piston assemblies, each including a lower clamping contact capable of piston movement. The lower housing also has a lower air passage system that is connected to the lower piston assemblies and drives the lower clamping contacts of the lower piston assemblies to perform piston movement. When a workpiece needs to be clamped, the upper and lower air passage systems respectively drive the upper clamping contacts of the multiple upper piston assemblies and the lower clamping contacts of the multiple lower piston assemblies to move towards each other and clamp the workpiece.

[0009] As a further improvement to the above technical solution, the upper housing includes an upper cylinder head and an upper cylinder body, and the upper laser processing cavity is disposed inside the upper cylinder body. The lower housing includes a lower cylinder head and a lower cylinder body, and the lower laser processing cavity is disposed inside the lower cylinder body. The upper laser processing cavity and the lower laser processing cavity together form a laser processing cavity for laser welding.

[0010] As a further improvement to the above technical solution, the upper cylinder head is provided with an annular upper air groove on its wall surface near the upper cylinder body, and the upper cylinder head side wall is provided with an upper air inlet and an upper air outlet. The upper air groove is connected to the upper air inlet and the upper air outlet through an upper air passage and an upper air outlet. The upper air inlet is used to connect to an external high-pressure air source, and multiple upper piston assemblies are connected to the upper air groove.

[0011] As a further improvement to the above technical solution, an upper sealing gasket is provided between the upper cylinder head and the upper cylinder body. The upper sealing gasket has sealing gasket through holes of a number and size that match the upper piston assembly. The upper piston assembly is connected to the upper air groove through the sealing gasket through holes. The upper air circuit system includes the upper air groove, upper air inlet, upper air outlet, upper air passage, upper air hole and upper sealing gasket. The internal space formed by the upper air groove, upper air inlet, upper air outlet, upper air passage, upper air hole and upper sealing gasket is a high-pressure air circuit system.

[0012] As a further improvement to the above technical solution: the lower cylinder head is provided with an annular lower air groove on its wall surface near the lower cylinder body, and the lower cylinder head side wall is provided with a lower air inlet and a lower air outlet. The lower air groove is connected to the lower air inlet and the lower air outlet through a lower air passage and a lower air outlet. The lower air inlet is used to connect to an external high-pressure air source, and multiple lower piston assemblies are connected to the lower air groove.

[0013] As a further improvement to the above technical solution, a lower sealing gasket is provided between the lower cylinder head and the lower cylinder body. The lower sealing gasket has sealing gasket through holes of a number and size that match the lower piston assembly. The lower piston assembly is connected to the lower air groove through the sealing gasket through holes. The lower air passage system includes the lower air groove, lower air inlet, lower air outlet, lower air passage, lower air hole and lower sealing gasket. The internal space formed by the lower air groove, lower air inlet, lower air outlet, lower air passage, lower air hole and lower sealing gasket is a high-pressure air passage system.

[0014] As a further improvement to the above technical solution, the upper piston assembly includes an upper piston sleeve, an upper piston, and an upper clamping contact. The upper cylinder body has multiple upper piston mounting holes located near the periphery of the upper laser processing cavity. The upper piston sleeve is disposed in the upper piston mounting holes, and the upper piston is disposed inside the upper piston sleeve. The upper clamping contact is detachably connected to the upper piston. The space of the upper piston near the upper cylinder head is connected to the upper air passage system and is driven by the upper air passage system to move within the upper piston sleeve.

[0015] As a further improvement to the above technical solution, an upper return spring is provided on the side of the upper piston away from the upper air circuit system. The upper return spring is disposed in the upper piston sleeve and is used to elastically drive the upper piston and the upper clamping contact to retract and reset inward.

[0016] As a further improvement to the above technical solution, the lower piston assembly includes a lower piston sleeve, a lower piston, and a lower clamping contact. The lower cylinder body has multiple lower piston mounting holes located near the periphery of the lower laser processing cavity. The lower piston sleeve is disposed in the lower piston mounting holes, and the lower piston is disposed inside the lower piston sleeve. The lower clamping contact is detachably connected to the lower piston. The space of the lower piston near the lower cylinder head is connected to the lower air passage system and is driven by the lower air passage system to move within the lower piston sleeve.

[0017] As a further improvement to the above technical solution, a lower return spring is provided on the side of the lower piston away from the lower air passage system. The lower return spring is disposed in the lower piston sleeve and is used to elastically drive the lower piston and the lower clamping contact to retract and reset inward.

[0018] As a further improvement to the above technical solution, a robotic arm connection part is provided on the top of the upper cylinder head, which is used to connect with an external robotic arm.

[0019] As a further improvement to the above technical solution, the upper cylinder head and the upper cylinder body are fixedly connected by upper fastening screws, and the lower cylinder head and the lower cylinder body are fixedly connected by lower fastening screws.

[0020] As a further improvement to the above technical solution, one of the upper and lower housings is provided with a limiting hole, and the other of the upper and lower housings is provided with a limiting pin. The limiting hole and the limiting pin are used in conjunction with each other to achieve mutual positioning of the upper and lower housings.

[0021] The present invention also provides:

[0022] A laser welding device, comprising a laser welding head and the multi-touch clamping device for laser lap welding of non-planar parts.

[0023] The beneficial effects of this invention are as follows: This invention provides a multi-contact clamping device and laser welding equipment for laser lap welding of non-planar parts. This multi-contact clamping device and laser welding equipment are respectively equipped with an upper piston assembly and a lower piston assembly in the upper and lower housings. The upper clamping contact in the upper piston assembly is driven by the upper air path system, and the lower clamping contact in the lower piston assembly is driven by the lower air path system. This enables multi-contact clamping of non-planar components made of dissimilar materials, achieving omnidirectional, multi-point contact fixation of complex-shaped workpieces. These contacts can adaptively adjust according to the shape and surface characteristics of the workpiece, ensuring that the workpiece maintains a stable position and posture during the laser connection process. Furthermore, the multi-contact fixing device possesses good flexibility and versatility, adapting to the fixing needs of different types and sizes of workpieces, greatly expanding the application scope of laser connection technology.

[0024] In summary, this multi-contact clamping device and laser welding equipment for laser lap welding of non-planar parts effectively solves the technical defects of existing clamping, such as poor stability, low positioning accuracy, and impact on welding quality and production efficiency. Attached Figure Description

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] Figure 1 This is an assembly schematic diagram of a multi-contact clamping device for laser lap welding of non-planar parts according to the present invention;

[0027] Figure 2 This is a schematic diagram of the upper air passage system in this invention;

[0028] Figure 3 This is a schematic diagram of the lower air passage system in this invention;

[0029] Figure 4 This is an internal sectional view of the upper housing in this invention;

[0030] Figure 5 This is another internal sectional view of the upper housing in this invention;

[0031] Figure 6 This is a schematic diagram of the upper piston assembly in this invention;

[0032] Figure 7 This is an internal sectional view of the lower housing in this invention;

[0033] Figure 8 This is another internal sectional view of the lower housing in this invention;

[0034] Figure 9 This is a schematic diagram of the lower piston assembly in this invention;

[0035] Figure 10 This is a schematic diagram of the upper sealing gasket in this invention;

[0036] Figure 11 This is a schematic diagram of the structure of the lower sealing gasket in this invention;

[0037] Figure 12 This is a top view of the upper cylinder head in this invention. Detailed Implementation

[0038] The following will clearly and completely describe the concept, specific structure, and technical effects of the present invention in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are all within the scope of protection of the present invention. Furthermore, all connections / linkages involved in the patent do not simply refer to direct contact between components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. The various technical features in this invention can be combined interactively without contradicting each other, as described above. Figure 1-12 .

[0039] Specific reference reference Figure 1 , Figure 4 , Figure 9 The present invention provides:

[0040] A multi-contact clamping device for laser lap welding of non-planar parts includes an upper housing 1 and a lower housing 2 that are mutually matched. The upper housing 1 has a downward-opening upper laser processing cavity 10, and the lower housing 2 has an upward-opening lower laser processing cavity 20. The upper laser processing cavity 10 and the lower laser processing cavity 20 together form a laser processing cavity for laser welding. When welding is performed, the workpiece is placed between the upper housing 1 and the lower housing 2, and the laser welding is performed in the laser processing cavity, which is the laser processing area. The upper housing 1 is equipped with multiple upper piston assemblies, each including an upper clamping contact 131 capable of piston movement. An upper air passage system is also provided inside the upper housing 1, connected to and used to drive the upper clamping contact 131 of the upper piston assembly to perform piston movement. The lower housing 2 is equipped with multiple lower piston assemblies, each including a lower clamping contact 231 capable of piston movement. A lower air passage system is also provided inside the lower housing 2, connected to and used to drive the lower clamping contact 231 of the lower piston assembly to perform piston movement. When a workpiece needs to be clamped, the upper and lower air passage systems respectively drive the upper clamping contacts 131 of the multiple upper piston assemblies and the lower clamping contacts 231 of the multiple lower piston assemblies to move towards each other and clamp the workpiece. Specifically, the upper and lower air supply systems are connected to independent external air sources. During laser welding, the workpiece is placed between the upper housing 1 and the lower housing 2. High-pressure air sources are introduced into the upper and lower air supply systems, which push out the upper clamping contact 131 in the upper piston assembly and the lower clamping contact 231 in the lower piston assembly, respectively. The workpiece is clamped by the upper clamping contact 131 and the lower clamping contact 231. This method of clamping the workpiece can achieve multi-contact clamping, and the clamping contacts can be adapted to non-planar irregular workpieces. By changing the appropriate clamping contact according to the workpiece, the force between the workpieces can be made more uniform, thereby improving the clamping stability and clamping accuracy. This effectively solves the technical defects of the existing technology, such as poor clamping stability, low positioning accuracy, and impact on welding quality and production efficiency.

[0041] Reference Figure 1 , Figure 4 , Figure 7 In some embodiments, the upper housing 1 includes an upper cylinder head 11 and an upper cylinder body 12, with the upper laser processing cavity 10 disposed inside the upper cylinder body 12. The lower housing 2 includes a lower cylinder head 21 and a lower cylinder body 22, with the lower laser processing cavity 20 disposed inside the lower cylinder body 22. In this embodiment, the upper cylinder head 11 and the upper cylinder body 12 are fixedly connected by upper fastening screws, and the lower cylinder head 21 and the lower cylinder body 22 are fixedly connected by lower fastening screws 26.

[0042] Reference Figure 1In some embodiments, one of the upper housing 1 and the lower housing 2 is provided with a limiting hole 15, and the other of the upper housing 1 and the lower housing 2 is provided with a limiting pin 25. The limiting hole 15 and the limiting pin 25 are used in conjunction with each other to achieve mutual positioning of the upper housing 1 and the lower housing 2. In this embodiment, the limiting hole 15 is provided on the bottom surface of the upper cylinder 12 of the upper housing 1, and the limiting pin 25 is provided on the top surface of the lower cylinder 22. In order to facilitate the mutual positioning of the limiting hole 15 and the limiting pin 25 and improve the positioning efficiency, the positioning pin 25 is set into a conical shape with a certain taper, which can achieve rapid positioning.

[0043] Reference Figure 2 , Figure 10 , Figure 11 In some embodiments, the upper cylinder head 11 is provided with an annular upper air groove 111 on its wall surface near the upper cylinder body 12. The upper cylinder head 111 sidewall is provided with an upper air inlet 112 and an upper air outlet 113. The upper air groove 111 is connected to the upper air inlet 112 and the upper air outlet 113 through an upper air passage 114 and an upper air outlet 115. The upper air inlet 112 is used to connect to an external high-pressure air source. The plurality of upper piston assemblies are connected to the upper air groove 111. An upper sealing gasket 14 is provided between the upper cylinder head 11 and the upper cylinder body 12. The upper sealing gasket 14 has sealing gasket through holes of a number and size that match the upper piston assembly. The upper piston assembly is connected to the upper air groove 111 through the sealing gasket through holes. The upper air circuit system includes the upper air groove 111, upper air inlet 112, upper air outlet 113, upper air passage 114, upper air hole 115 and upper sealing gasket 14. The internal space formed by the upper air groove 111, upper air inlet 112, upper air outlet 113, upper air passage 114, upper air hole 115 and upper sealing gasket 14 is a high-pressure air circuit system. In this embodiment, the upper air groove 111 is a square groove. The upper air groove 111 is sealed by the upper sealing gasket 14. When the external high-pressure air source inputs high-pressure gas into the interior through the upper air inlet 112, the upper air passage 114 and the upper air hole 115, the pressure in the upper air groove 111 increases. Then, the high-pressure gas in the upper air groove 111 drives the upper clamping contact 131 connected to it to push outward. The pushed-out upper clamping contact 131 clamps the workpiece.

[0044] Reference Figure 3In some embodiments, the lower cylinder head 21 has an annular lower air groove 211 on its wall surface near the lower cylinder body 22, and the lower cylinder head 21 has a lower air inlet 212 and a lower air outlet 214 on its side wall. The lower air groove is connected to the lower air inlet 212 and the lower air outlet 213 through the lower air passage 214 and the lower air outlet 215. The lower air inlet 212 is used to connect to an external high-pressure air source, and the plurality of lower piston assemblies are connected to the lower air groove 211. A lower sealing gasket 24 is provided between the lower cylinder head 21 and the lower cylinder body 22. The lower sealing gasket 24 has sealing gasket through holes of a number and size that match the lower piston assembly. The lower piston assembly is connected to the lower air groove 211 through the sealing gasket through holes. The lower air passage system includes the lower air groove 211, lower air inlet 212, lower air outlet 213, lower air passage 214, lower air hole 215 and lower sealing gasket 24. The internal space formed by the lower air groove 211, lower air inlet 212, lower air outlet 213, lower air passage 214, lower air hole 215 and lower sealing gasket 24 is a high-pressure air passage system. In this embodiment, the lower air groove 211 is a square groove. The lower air groove 211 is sealed by the lower sealing gasket 24. When the external high-pressure gas source inputs high-pressure gas into the interior through the lower air inlet 212, the lower air passage 214 and the lower air hole 215, the pressure in the lower air groove 211 increases. Then, the high-pressure gas in the lower air groove 211 drives the lower clamping contact 231 connected to it to push outward. The pushed-out lower clamping contact 231 clamps the workpiece.

[0045] Reference Figure 4 , Figure 5 , Figure 6In some embodiments, the upper piston assembly includes an upper piston sleeve 132, an upper piston 133, and an upper clamping contact 131. The upper cylinder 12 has multiple upper piston mounting holes 121 located near the periphery of the upper laser processing cavity 10. The upper piston sleeve 132 is disposed within the upper piston mounting holes 121, and the upper piston 133 is disposed within the upper piston sleeve 132. The upper clamping contact 131 is detachably connected to the upper piston 133. The space of the upper piston 133 near the upper cylinder head 11 communicates with the upper air passage system and is driven by the upper air passage system to move within the upper piston sleeve 132. An upper return spring 134 is disposed on the side of the upper piston 133 away from the upper air passage system. The upper return spring 134 is disposed within the upper piston sleeve 132 and is used to elastically drive the upper piston 133 and the upper clamping contact 131 to retract and reset inwards. In application, the high-pressure gas in the upper air groove 111 drives the upper piston 133 to move outward in the upper piston sleeve 132. The upper piston 133 drives the upper clamping contact 131 to push outward, clamping the workpiece. When it is necessary to release the workpiece from the clamping state, the high-pressure gas in the upper air groove 111 is output outward through the upper air passage 114, upper air hole 115 and upper air outlet 113, releasing the high-pressure state inside the upper air circuit system. At this time, the upper piston 133 moves inward under the elastic force of the upper return spring 134, thereby synchronously driving the upper clamping contact 131 to return inward. At this time, the clamping state of the workpiece can be released.

[0046] Reference Figure 7 , Figure 8 , Figure 8In some embodiments, the lower piston assembly includes a lower piston sleeve 232, a lower piston 233, and a lower clamping contact 231. The lower cylinder 22 has multiple lower piston mounting holes 221 located near the periphery of the lower laser processing cavity 20. The lower piston sleeve 232 is disposed within the lower piston mounting holes 221, and the lower piston 233 is disposed within the lower piston sleeve 232. The lower clamping contact 231 is detachably connected to the lower piston 233. The space of the lower piston 233 near the lower cylinder head 21 communicates with the lower air passage system and is driven by the lower air passage system to move within the lower piston sleeve 232. A lower return spring 234 is disposed on the side of the lower piston 233 away from the lower air passage system. The lower return spring 234 is disposed within the lower piston sleeve 232 and is used to elastically drive the lower piston 233 and the lower clamping contact 231 to retract and reset inwards. In application, the high-pressure gas in the lower air groove 211 drives the lower piston 233 to move outward in the lower piston sleeve 232. The lower piston 233 drives the lower clamping contact 231 to push outward, clamping the workpiece. When it is necessary to release the workpiece from the clamping state, the high-pressure gas in the lower air groove 211 is output outward through the lower air passage 214, lower air hole 215 and lower air outlet 213, releasing the high-pressure state inside the lower air system. At this time, the lower piston 233 moves inward under the elastic force of the lower return spring 234, thereby synchronously driving the lower clamping contact 231 to return inward. At this time, the clamping state of the workpiece can be released.

[0047] Reference Figure 12 In some embodiments, a robotic arm connection portion 16 is provided on the top of the upper cylinder head 11, which is used to connect with an external robotic arm. This facilitates automated production by automated control.

[0048] In practice, with the assistance of a robotic arm, the upper housing 1 and lower housing 2 can be quickly connected via the limiting hole 15 of the upper housing 1 and the limiting pin 25 of the lower housing 2, resulting in a larger laser processing area and facilitating connections between various types of components. Changing the appropriate upper clamping contact 131 and lower clamping contact 231 according to the workpiece ensures more even force distribution between the workpieces. With the assistance of the robotic arm, the workpiece to be processed is placed in the laser processing area between the upper housing 1 and lower housing 2. High-pressure gas is input through the upper and lower high-pressure gas channels of the upper and lower housing 1 and lower housing 2, including the upper and lower air inlets, upper and lower air passages, upper and lower air holes, upper and lower air grooves, and upper and lower air outlets. Then, the upper and lower pistons drive the upper and lower contacts to apply pressure to the workpiece surface, making the connection between the workpieces tighter. The laser processing machine is then set with appropriate parameters for processing. After processing, the input of high-pressure gas is stopped and the upper and lower air outlets are opened. The upper and lower pistons drive the upper and lower contacts to automatically return to their pre-processing positions under the action of the upper and lower return springs, and then the robotic arm can remove the welded workpiece. This device can fully utilize the automation of robotic arms to implement efficient and rapid processing while ensuring the quality of the connection. Moreover, irregularly shaped workpiece joints can create connection interfaces and reduce shearing effects under stress, greatly improving the mechanical properties of the joint.

[0049] Based on the above-mentioned multi-touch clamping device for laser lap welding of non-planar parts, the present invention also provides:

[0050] A laser welding device, comprising a laser welding head and the multi-touch clamping device for laser lap welding of non-planar parts.

[0051] The above is a detailed description of the preferred embodiments of the present invention. However, the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A multi-contact clamping device for laser lap welding of non-planar parts, characterized in that: The system includes a matching upper housing (1) and a lower housing (2). The upper housing (1) has a downward-opening upper laser processing cavity (10) and multiple upper piston assemblies. Each upper piston assembly includes an upper clamping contact (131) capable of piston movement. The upper housing (1) also has an upper air passage system that communicates with the upper piston assemblies and drives the upper clamping contact (131) of the upper piston assemblies to perform piston movement. The lower housing (2) has an upward-opening lower laser processing cavity (20). The lower housing (2) is provided with multiple lower piston assemblies. The lower piston assembly includes a lower clamping contact (231) that can perform piston movement. The lower housing (2) is provided with a lower air passage system. The lower air passage system is connected to the lower piston assembly and is used to drive the lower clamping contact (231) of the lower piston assembly to perform piston movement. When it is necessary to clamp the workpiece, the upper air passage system and the lower air passage system respectively drive the upper clamping contact (131) of the multiple upper piston assemblies and the lower clamping contact (231) of the multiple lower piston assemblies to move towards each other and clamp the workpiece.

2. The multi-contact clamping device for laser lap welding of non-planar parts according to claim 1, characterized in that: The upper housing (1) includes an upper cylinder head (11) and an upper cylinder body (12). The upper laser processing cavity (10) is disposed inside the upper cylinder body (12). The lower housing (2) includes a lower cylinder head (21) and a lower cylinder body (22). The lower laser processing cavity (20) is disposed inside the lower cylinder body (22). The upper laser processing cavity (10) and the lower laser processing cavity (20) together form a laser processing cavity for laser welding.

3. The multi-contact clamping device for laser lap welding of non-planar parts according to claim 2, characterized in that: The upper cylinder head (11) has an annular upper air groove (111) on its wall near the upper cylinder body (12). The upper cylinder head (111) has an upper air inlet (112) and an upper air outlet (113) on its side wall. The upper air groove (111) is connected to the upper air inlet (112) and the upper air outlet (113) through an upper air passage (114) and an upper air outlet (115). The upper air inlet (112) is used to connect to an external high-pressure air source. The multiple upper piston assemblies are connected to the upper air groove (111). An upper sealing gasket (14) is provided between the upper cylinder head (11) and the upper cylinder body (12). The upper sealing gasket (14) has sealing gasket through holes of a number and size that match the upper piston assembly. The upper piston assembly is connected to the upper air groove (111) through the sealing gasket through holes. The upper air circuit system includes the upper air groove (111), upper air inlet (112), upper air outlet (113), upper air passage (114), upper air hole (115) and upper sealing gasket (14). The internal space formed by the upper air groove (111), upper air inlet (112), upper air outlet (113), upper air passage (114), upper air hole (115) and upper sealing gasket (14) is a high-pressure air circuit system.

4. The multi-contact clamping device for laser lap welding of non-planar parts according to claim 2, characterized in that: The lower cylinder head (21) has an annular lower air groove (211) on its wall near the lower cylinder body (22). The side wall of the lower cylinder head (21) has a lower air inlet (212) and a lower air outlet (214). The lower air groove is connected to the lower air inlet (212) and the lower air outlet (213) through the lower air passage (214) and the lower air outlet (215). The lower air inlet (212) is used to connect to an external high-pressure air source. The multiple lower piston assemblies are connected to the lower air groove (211). A lower sealing gasket (24) is provided between the lower cylinder head (21) and the lower cylinder body (22). The lower sealing gasket (24) has sealing gasket through holes of a number and size that match the lower piston assembly. The lower piston assembly is connected to the lower air groove (211) through the sealing gasket through holes. The lower air circuit system includes the lower air groove (211), lower air inlet (212), lower air outlet (213), lower air passage (214), lower air hole (215) and lower sealing gasket (24). The internal space formed by the lower air groove (211), lower air inlet (212), lower air outlet (213), lower air passage (214), lower air hole (215) and lower sealing gasket (24) is a high-pressure air circuit system.

5. A multi-contact clamping device for laser lap welding of non-planar parts according to claim 2, characterized in that: The upper piston assembly includes an upper piston sleeve (132), an upper piston (133), and an upper clamping contact (131). The upper cylinder body (12) has a plurality of upper piston mounting holes (121) located near the periphery of the upper laser processing cavity (10). The upper piston sleeve (132) is disposed in the upper piston mounting holes (121), and the upper piston (133) is disposed inside the upper piston sleeve (132). The upper clamping contact (131) is detachably connected to the upper piston (133). The space of the upper piston (133) near the upper cylinder head (11) is connected to the upper air passage system and is driven by the upper air passage system to move within the upper piston sleeve (132).

6. The multi-contact clamping device for laser lap welding of non-planar parts according to claim 5, characterized in that: An upper return spring (134) is provided on the side of the upper piston (133) away from the upper air circuit system. The upper return spring (134) is disposed in the upper piston sleeve (132). The upper return spring (134) is used to elastically drive the upper piston (133) and the upper clamping contact (131) to retract and reset inward.

7. A multi-contact clamping device for laser lap welding of non-planar parts according to claim 2, characterized in that: The lower piston assembly includes a lower piston sleeve (232), a lower piston (233), and a lower clamping contact (231). The lower cylinder (22) has a plurality of lower piston mounting holes (221) located near the periphery of the lower laser processing cavity (20). The lower piston sleeve (232) is disposed in the lower piston mounting holes (221), and the lower piston (233) is disposed inside the lower piston sleeve (232). The lower clamping contact (231) is detachably connected to the lower piston (233). The space of the lower piston (233) near the lower cylinder head (21) is connected to the lower air passage system and is driven by the lower air passage system to move within the lower piston sleeve (232).

8. A multi-contact clamping device for laser lap welding of non-planar parts according to claim 7, characterized in that: A lower return spring (234) is provided on the side of the lower piston (233) away from the lower air passage system. The lower return spring (234) is disposed in the lower piston sleeve (232). The lower return spring (234) is used to elastically drive the lower piston (233) and the lower clamping contact (231) to retract and reset inward.

9. A multi-contact clamping device for laser lap welding of non-planar parts according to claim 2, characterized in that: The top of the upper cylinder head (11) is provided with a robot arm connection part (16), which is used to connect with an external robot arm; The upper cylinder cover (11) and the upper cylinder body (12) are fixedly connected by upper fastening screws, and the lower cylinder cover (21) and the lower cylinder body (22) are fixedly connected by lower fastening screws (26). One of the upper housing (1) and the lower housing (2) is provided with a limiting hole (15), and the other of the upper housing (1) and the lower housing (2) is provided with a limiting pin (25). The limiting hole (15) and the limiting pin (25) are used together to achieve mutual positioning of the upper housing (1) and the lower housing (2).

10. A laser welding device, characterized in that: The laser welding equipment includes a laser welding head and a multi-touch clamping device for laser lap welding of non-planar parts as described in any one of claims 1-9.

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