An ultrasonic welding system for profiled retrofit vehicle lamps

Abstract

The application discloses a special-shaped refitted vehicle lamp ultrasonic welding system, which comprises a welding device and a welding head slidingly arranged on the welding device, and comprises a first workpiece, a second workpiece and a lamp holder to be welded; the lamp holder to be welded has a first fusion surface and a second fusion surface; the system further comprises a preliminary limiting bearing unit and a rear supporting unit; the preliminary limiting bearing unit comprises a moving seat, a supporting part and a releasing bearing part; the moving seat is horizontally and slidingly arranged on the welding device; the supporting part is arranged on the top of the moving seat and is provided with a bearing surface matched with the outer edge of the lamp holder to be welded; the rear supporting unit is used for being in abutting contact with the plastic material overflowing from the first workpiece when complete welding is carried out after preliminary welding, so that the problems of micro-cracks generated on the first workpiece due to the welding vibration of the second workpiece after complete welding of the first workpiece and the lack of positioning reference of the second workpiece are solved, and the effect of segmented stable welding is achieved.

Description

Technical Field

[0001] This invention relates to the field of ultrasonic welding technology, and more specifically, to an ultrasonic welding system for irregularly shaped modified vehicle lights. Background Technology

[0002] Ultrasonic welding is a welding process that uses high-frequency vibration to generate frictional heat between the contact surfaces of the workpieces to be welded, causing localized melting of the contact surfaces and forming a connection under pressure. In the field of automotive lighting manufacturing, ultrasonic welding is widely used to weld plastic workpieces such as lamp covers and lamp bodies to lamp holders to form a sealed connection.

[0003] Currently, ultrasonic welding equipment for automotive lights on the market typically includes a welding device and a liftable welding head, used to weld workpieces placed on the lamp holder. For products that require welding two plastic parts on the same lamp holder, the common practice is to first place the two parts in their corresponding positions on the lamp holder, and then perform complete ultrasonic welding on each part sequentially.

[0004] While this sequential welding method is simple to operate, it still presents the following problems in actual production: Taking the order of welding one component first and then another as an example, once the first component is welded, a rigid connection is formed between it and the lamp holder. When placing the subsequent component, it lacks a stable positioning reference, and its positional accuracy relative to the lamp holder and the first welded component depends on the operator's placement experience. When welding the subsequent component, ultrasonic vibrations are transmitted through the subsequent component to the lamp holder, and then from the lamp holder to the already welded first component. The solidified weld is subjected to alternating stress, which may cause micro-cracks and affect the sealing performance.

[0005] To address these issues, some existing technologies employ segmented welding. This involves supporting the first component at a predetermined height, maintaining a gap between its welding surface and the lamp holder's welding surface, and performing preliminary welding to create a temporary connection. This provides a positioning reference for subsequent components. The first component is then fully welded after the subsequent components are completed. However, in this approach, if the supporting mechanism continuously lifts the first component from the bottom, it occupies the space beneath it, affecting the placement or welding of subsequent components. If the supporting mechanism is removed, the first component is supported only by the temporary connection formed by the preliminary welding. Vibrations from the subsequent welding can cause slight movements or deflections in the first component, loosening the preliminary connection and affecting the subsequent complete welding of the first component.

[0006] Furthermore, in the final welding stage, the weld bead of the first component completely melts and collapses under ultrasonic vibration and pressure, and molten plastic is extruded from the weld interface. Since the supporting mechanism has detached from the bottom surface of the first component at this time, and there is no shielding on the outside of the weld, the overflowing molten plastic flows along the outer wall of the first component or the surface of the lamp holder, and after cooling, forms irregular flash that adheres to the surface of the workpiece. This flash adheres tightly to the workpiece, making grinding difficult and easily damaging the workpiece body. Summary of the Invention

[0007] In view of the shortcomings of the existing technology, the purpose of this invention is to provide an ultrasonic welding system for irregularly shaped modified vehicle lights.

[0008] To achieve the above objectives, the present invention provides the following technical solution: An ultrasonic welding system for irregularly shaped modified vehicle lights includes a welding device and a welding head slidably mounted on the welding device. The system includes a first workpiece, a second workpiece, and a lamp holder to be welded. The lamp holder to be welded has a first fusion surface and a second fusion surface. It also includes a preliminary limiting support unit and a rear support unit. The preliminary limiting support unit includes a movable seat, a support portion, and a release support portion. The movable seat is horizontally slidably mounted on the welding device. The support portion is located on top of the movable seat and has a support surface adapted to the outer edge of the lamp holder to be welded, and a mating surface adapted to the bottom surface of the lamp holder to be welded. The release support portion is used to support the first workpiece and drive the first welding surface of the first workpiece to a preliminary positioning welding state with the first fusion surface of the lamp holder to be welded. The rear support unit is used to contact the overflowing plastic material of the first workpiece during the final welding after the preliminary welding is completed.

[0009] By adopting the above technical solution, the problem of microcracks caused by the welding vibration of the second workpiece after the first workpiece has been completely welded has been solved.

[0010] The present invention is further configured such that: the bearing surface is a plane, and the bearing surface is in contact with the bottom of the lamp holder to be welded; the contact surface is a semi-circular groove structure, and the contact surface is in contact with the outer side of the extension end of the lamp holder to be welded; in the placed state, the lamp holder to be welded is in contact with both the bearing surface and the contact surface.

[0011] The present invention is further configured such that: both the first workpiece and the second workpiece have a first welding surface and a second welding surface, the first welding surface is the bottom outer edge of the first workpiece and the second workpiece, and the second welding surface is the inner wall side surface of the first workpiece and the second workpiece; the top of the lamp holder to be welded has a first fusion surface and a second fusion surface, the first fusion surface and the second fusion surface corresponding to the first welding surface and the second welding surface, respectively.

[0012] The present invention is further configured such that: the release bearing part includes a vertical sliding part, a clamping cylinder, a clamping part, and a limiting part; the vertical sliding part is slidably disposed on the welding equipment in a vertical direction and located beside the movable seat; the clamping cylinder is disposed on one side of the vertical sliding part and is fixedly connected to one side of the vertical sliding part; the clamping part has a pair and is rotatably disposed on the output end of the clamping cylinder; the limiting part has multiple parts, each disposed on one side of the clamping part, and the top end face of the limiting part can abut against the bottom outer edge of the first workpiece.

[0013] The present invention is further configured such that: multiple limiting parts have the same structure and all have the same height, and the extended ends of multiple limiting parts are all spaced apart from the second welding surface and the second fusion surface; when the clamping cylinder is activated and drives the clamping part into a clamping state, the bottom outer edge of the first workpiece can abut against the top of the limiting part in this state, and the limiting part can abut against the top of the first fusion surface of the lamp holder to be welded and drive the first welding surface of the first workpiece to maintain a preset distance from the first fusion surface.

[0014] The present invention is further configured such that: when there is a preset distance between the first welding surface of the first workpiece and the first fusion surface on the lamp holder to be welded, the second welding surface of the first workpiece can be in a contacting state with the second fusion surface on the lamp holder to be welded in this state, and the welding head descends and performs preliminary welding work on the first workpiece.

[0015] The invention is further configured such that: the release bearing part also includes a frame and a vertical drive part; the frame is mounted on the welding equipment and located beside the movable seat; the vertical drive part is located on the top of the frame, and the output end of the vertical drive part is fixedly connected to the vertical sliding part, so that when the vertical drive part is started, it can drive the vertical sliding part to move in an upward or downward state.

[0016] The present invention is further configured such that: when the first workpiece is initially welded and the second workpiece needs to be welded, the clamping cylinder drives the clamping part and the limiting part to disengage from the bottom of the first workpiece, and the vertical driving part drives the vertical sliding part, the clamping cylinder and the clamping part to rise, so that the limiting part stays on the outside of the first workpiece and is in contact with the outside of the first workpiece to maintain the position of the first workpiece on the lamp holder and provide a positioning reference for the second workpiece.

[0017] The present invention is further configured such that: the rear support unit includes a rising part and a driving member; the rising part is slidably disposed on a movable seat in a vertical direction, and the movable seat is provided with a slot for the rising part to pass through, the slot being located at the outer edge of the first workpiece and the lamp holder to be welded; the driving member is disposed on the movable seat, and the output end of the driving member is fixedly connected to the rising part.

[0018] The invention is further configured such that when the welding head performs complete welding on the first workpiece, the clamping part is released, the restricting part is disengaged from the outside of the first workpiece, and the rising part rises, so that the top surface of the rising part is at the same level as the first fusion surface of the lamp holder to be welded and the first welding surface of the first workpiece.

[0019] By adopting the above technical solution, when the welding head performs complete welding on the first workpiece, the clamping part is released and the restricting part is removed from the outside of the first workpiece, avoiding interference with the welding operation. At the same time, the rising part rises until its top surface is at the same level as the first fusion surface of the lamp holder to be welded and the first welding surface of the first workpiece, so that the molten plastic extruded during welding can flow to the top surface of the rising part and cool to form a sheet, preventing burrs from adhering to the outer wall of the workpiece and facilitating subsequent grinding and removal.

[0020] In summary, this application includes at least one of the following beneficial technical effects: By setting up a preliminary limiting bearing unit, when a preset distance is maintained between the first welding surface and the first fusion surface, the second welding surface and the second fusion surface are in contact, providing lateral positioning for the first workpiece. The welding head descends to perform preliminary welding, forming a temporary connection under controllable gap conditions, providing a stable positioning basis for subsequent welding, while avoiding the risk of vibration damage caused by direct complete welding. This solves the problems in the prior art where microcracks are generated by the welding vibration of the second workpiece after the first workpiece is completely welded, and the second workpiece lacks a positioning reference.

[0021] By setting up a rear support unit, when the welding head is performing complete welding on the first workpiece, the clamping part is released and the restricting part is removed from the outside of the first workpiece, avoiding interference with the welding operation. At the same time, the rising part rises until its top surface is at the same level as the first fusion surface of the lamp holder to be welded and the first welding surface of the first workpiece, so that the molten plastic extruded during welding can flow to the top surface of the rising part and cool to form a sheet, preventing burrs from adhering to the outer wall of the workpiece and facilitating subsequent grinding and removal. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of an ultrasonic welding system for a non-standard modified vehicle headlight according to the present invention. Figure 2 This is a three-dimensional structural diagram of the first and second workpieces of the irregularly shaped modified vehicle headlight of the present invention; Figure 3 This is a three-dimensional structural diagram of the lamp holder to be welded according to the present invention; Figure 4 This is a three-dimensional structural diagram of the first and second workpieces of the present invention, with the workpieces welded to the lamp holder to be welded. Figure 5 A perspective view showing the first workpiece of the present invention placed on the limiting part; Figure 6 for Figure 5Enlarged structural diagram at point A in the middle; Figure 7 This is a partial three-dimensional cross-sectional view of the preliminary welding work between the first workpiece and the lamp holder to be welded according to the present invention. Figure 8 for Figure 7 Enlarged structural diagram at point B; Figure 9 This is a three-dimensional structural diagram of the second workpiece welded onto the lamp holder to be welded according to the present invention; Figure 10 This is a three-dimensional structural diagram of the rear support unit of the present invention; Figure 11 This is a three-dimensional cross-sectional view of the rear support unit of the present invention; Figure 12 for Figure 11 Enlarged structural diagram at point C.

[0023] Explanation of reference numerals in the attached drawings: 1. Welding equipment; 2. Welding head; 3. Initial limiting bearing unit; 31. Moving seat; 32. Supporting part; 321. Bearing surface; 322. Contact surface; 33. Releasing bearing part; 331. Vertical sliding part; 332. Clamping cylinder; 333. Clamping part; 334. Limiting part; 335. Frame; 336. Vertical drive part; 3301. Telescopic cylinder; 3302. Horizontal guide rail; 3303. Horizontal sliding part; 4. Rear support unit; 41. Lifting part; 42. Driving component. Detailed Implementation

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0026] Please see Figures 1-12 The present invention provides the following technical solutions: Example 1: For products that require welding the first workpiece and the second workpiece on the same lamp holder, the common practice in the prior art is to first place the first workpiece and the second workpiece in the corresponding positions of the lamp holder, and then perform complete ultrasonic welding on the two workpieces in sequence.

[0027] Taking the order of welding the first workpiece first and then the second workpiece as an example, once the first workpiece is welded, a rigid connection is formed between it and the lamp holder. When placing the second workpiece, there is no stable positioning reference, and its positional accuracy relative to the lamp holder and the first workpiece depends on the operator's placement experience.

[0028] Furthermore, when welding the second workpiece, the ultrasonic vibration is transmitted through the second workpiece to the lamp holder, and then from the lamp holder to the already welded first workpiece. The solidified weld is subjected to alternating stress, which may cause microcracks and affect the sealing performance.

[0029] To solve the above-mentioned technical problems, an ultrasonic welding system for irregularly shaped modified car lights in this embodiment includes a welding device 1 and a welding head 2 slidably disposed on the welding device 1. In this embodiment, the welding device 1 is an ultrasonic welding device in the prior art. The welding head 2 is slidably disposed on the welding device 1 and can move vertically and horizontally to perform welding operations on the first workpiece and the second workpiece respectively.

[0030] This embodiment also includes a preliminary limiting bearing unit 3, which includes a movable seat 31, a support part 32, and a release bearing part 33; wherein the support part 32 is located on the top of the movable seat 31, and the support part 32 has a bearing surface 321 adapted to the outer edge of the lamp holder to be welded, and a mating surface 322 adapted to the bottom surface of the lamp holder to be welded.

[0031] The initial positioning support unit 3 uses the movable seat 31 and the support part 32 to position and support the lamp holder to be welded, so that the lamp holder remains stable during the welding process. The release support part 33 is used to support the first workpiece and maintain a preset initial welding position between the first welding surface of the first workpiece and the first fusion surface of the lamp holder, so as to avoid the first workpiece being directly and completely welded and then affected by vibration when welding the second workpiece.

[0032] The movable seat 31 is horizontally slidably mounted on the welding equipment 1 and is driven by the horizontal drive module.

[0033] For details, please refer to Figures 7-9 The horizontal drive module includes at least one telescopic cylinder 3301, a horizontal guide rail 3302, and a horizontal sliding part 3303. The horizontal sliding part 3303 is slidably disposed on the horizontal guide rail 3302, and one end of it is fixedly connected to the side of the movable seat 31 via a connector. When it is necessary to switch the welding position, the telescopic cylinder 3301 is activated and drives the movable seat 31 to move through the horizontal sliding part 3303, so that the corresponding workpiece is located below the welding head 2.

[0034] This embodiment also includes a rear support unit 4; the rear support unit 4 is used to receive the plastic material overflowing from the first workpiece during subsequent complete welding, and to prevent the overflow material from adhering to the outer wall of the first workpiece.

[0035] See Figure 5The bearing surface 321 is a plane, and it is parallel to the bottom of the lamp holder to be welded, providing uniform support. The mating surface 322 has a semi-circular groove structure, and it abuts against the outer side of the extension end of the lamp holder to be welded. The semi-circular groove structure of the mating surface 322 fits with the outer side of the extension end of the lamp holder, restricting the horizontal displacement of the lamp holder and improving the stability of the lamp holder. In this embodiment, the lamp holder to be welded in the placed state is in contact with both the bearing surface 321 and the mating surface 322.

[0036] See Figure 2 , Figure 3 and Figure 4 Both the first workpiece and the second workpiece have a first welding surface and a second welding surface, wherein the first welding surface is the outer edge of the bottom of the workpiece, and the second welding surface is the inner wall side of the workpiece.

[0037] The top of the lamp holder to be welded has a first fusion surface and a second fusion surface, the first fusion surface and the first welding surface correspond to each other, and the second fusion surface and the second welding surface correspond to each other.

[0038] During welding, the first welding surface is in contact with the first fusion surface, and the second welding surface is in contact with the second fusion surface. The contact areas in the two directions together constitute the welding area between the workpiece and the lamp holder.

[0039] See Figures 5-7 The release bearing part 33 includes a vertical sliding part 331, a clamping cylinder 332, a clamping part 333, and a limiting part 334. The vertical sliding part 331 is vertically slidably disposed on the welding equipment 1 and located beside the movable seat 31. The clamping cylinder 332 is disposed on one side of the vertical sliding part 331. In this embodiment, the clamping cylinder 332 is preferably a pneumatic gripper cylinder in the prior art, whose output end can drive a pair of clamping parts 333 to open and close, so as to clamp or release the first workpiece. The clamping parts 333 are a pair and are respectively rotatably disposed on the output end of the clamping cylinder 332; the limiting parts 334 are multiple and are respectively disposed on one side of the clamping parts 333, and the top end face of the limiting part 334 can abut against the bottom outer edge of the first workpiece.

[0040] In the preparation stage before initial welding, the vertical sliding part 331 drives the clamping cylinder 332 and the clamping part 333 to move to a preset height, and the clamping cylinder 332 drives the pair of clamping parts 333 to close. This causes the top end face of the limiting part 334 to abut against the outer edge of the bottom of the first workpiece, providing support for the first workpiece and preventing displacement of the first workpiece during the initial placement stage.

[0041] See Figure 5 and Figure 6The multiple limiting parts 334 have identical structures and equal heights, and the extended ends of the multiple limiting parts 334 are all spaced apart from the second welding surface and the second fusion surface to avoid interfering with the adhesion between the second welding surface and the second fusion surface during the clamping process of the clamping part 333. Furthermore, in this embodiment, the extended ends of the limiting parts 334 extend towards the second welding surface and the second fusion surface, and their length is set so as not to contact the second welding surface and the second fusion surface, thus not hindering the welding of the second welding surface and the second fusion surface.

[0042] When the clamping cylinder 332 is activated and drives the clamping part 333 into a clamping state, the top end face of the limiting part 334 abuts against the bottom outer edge of the first workpiece, and at the same time, the limiting part 334 abuts against the top of the first fusion surface of the lamp holder to be welded. Since the height of the limiting part 334 is fixed, a preset distance is naturally maintained between the first welding surface and the first fusion surface of the first workpiece.

[0043] See Figure 7 and Figure 8 When a preset distance is maintained between the first welding surface of the first workpiece and the first fusion surface on the lamp holder to be welded, providing a pre-set distance for initial welding, the second welding surface of the first workpiece can be in a contacting state with the second fusion surface on the lamp holder to be welded, providing lateral clamping and positioning for the outer side of the first workpiece. In this contacting state, the welding head 2 descends and performs preliminary welding on the first workpiece.

[0044] In this embodiment, the preliminary welding process is controlled by the control system of the welding equipment 1. A shorter welding time and a smaller ultrasonic amplitude are used to ensure that only partial melting occurs on the first welding surface of the first workpiece, forming a temporary connection without complete collapse. The preliminary welding time is preferably 0.1–0.3 seconds, and the normal complete welding time is preferably 0.5–1.5 seconds; that is, the preliminary welding time is shorter than the complete welding time.

[0045] In this embodiment, the initial welding of the first workpiece is carried out under controllable gap conditions and is only a temporary connection, providing a stable positioning basis for the subsequent welding of the second workpiece. After the welding of the second workpiece is completed, the first workpiece is then fully welded, thereby avoiding the problem of microcracks arising from the solidified weld being subjected to alternating stress under the vibration of the second workpiece welding after the first workpiece has been welded once.

[0046] In Example 2, when welding the second workpiece, the first workpiece is supported only by the temporary connection point formed by the initial welding. Under the transmission of the welding vibration of the second workpiece, the first workpiece will move slightly or deflect, causing the initial connection point to loosen, which in turn affects the subsequent completion of the welding work of the first workpiece and may also affect the welding alignment accuracy of the second workpiece. When the first workpiece is subsequently fully welded, it may also squeeze the already welded second workpiece.

[0047] See Figure 9 The release bearing unit 33 also includes a frame 335 and a vertical drive unit 336. The frame 335 is mounted on the welding equipment 1 and located beside the movable seat 31. The vertical drive unit 336 is located on top of the frame 335, and its output end is fixedly connected to the vertical sliding part 331. In this embodiment, the vertical drive unit 336 is preferably an electric push rod, which can drive the vertical sliding part 331, the clamping cylinder 332, and the clamping part 333 to rise and fall as a whole when started, providing power for bottom bearing in the initial welding stage and subsequent switching to lateral limiting.

[0048] See Figure 9 When the initial welding of the first workpiece is completed and the welding of the second workpiece is required, the clamping cylinder 332 drives the clamping part 333 and the limiting part 334 to disengage from the bottom of the first workpiece. The vertical driving part 336 drives the vertical sliding part 331, the clamping cylinder 332, and the clamping part 333 to rise, causing the limiting part 334 to stop outside the first workpiece, and the limiting part 334 to be in contact with the outside of the first workpiece. In this state, the limiting part 334 provides horizontal constraint, keeping the first workpiece in a stable position during the welding of the second workpiece, avoiding loosening of the initial connection point or deflection of the first workpiece due to vibration transmission, thereby providing a positioning reference for the second workpiece.

[0049] In this embodiment, after the first workpiece completes the initial welding and the limiting part 334 switches to external contact, the horizontal drive module is activated, driving the moving seat 31 to move so that the second workpiece is positioned below the welding head 2. Then the welding head 2 descends to perform complete welding on the second workpiece. The complete welding of the second workpiece uses normal welding parameters to form a firm connection between the second workpiece and the lamp holder.

[0050] In Example 3, during the complete welding process, the weld bead of the first workpiece completely melts and collapses under ultrasonic vibration and pressure, and molten plastic is extruded from the weld interface. Since the release bearing part 33 has detached from the bottom surface of the first workpiece, i.e., the first welding surface, the outside of the weld lacks shielding, and the overflowing molten plastic flows along the outer wall of the first workpiece or the surface of the lamp holder. After cooling, it forms irregular flash adhering to the workpiece surface. This flash adheres tightly to the workpiece, making grinding difficult and easily damaging the workpiece body.

[0051] See Figures 10-12The rear support unit 4 includes a lifting part 41 and a driving component 42. The lifting part 41 is slidably mounted on a movable base 31 in a vertical direction. The movable base 31 has a slot for the lifting part 41 to pass through, and the slot is located at the outer edge of the first workpiece and the lamp holder to be welded. The driving component 42 is mounted on the movable base 31, and its output end is fixedly connected to the lifting part 41. In this embodiment, the driving component 42 is preferably an electric cylinder, which can drive the lifting part 41 to slide vertically within the slot, so that the lifting part 41 can move to the outer edge of the first workpiece and the lamp holder to be welded, providing an actuating component for receiving welding overflow. The lifting part 41 is preferably made of stainless steel. Stainless steel has a smooth surface and good thermal conductivity, which is beneficial for the cooling and shaping of overflow and facilitates subsequent demolding.

[0052] When the welding head 2 performs a complete welding operation on the first workpiece, the clamping part 333 releases, and the restricting part 334 disengages from the outside of the first workpiece to avoid interfering with the welding operation. At the same time, the driving member 42 drives the rising part 41 to rise, so that the top surface of the rising part 41 is at the same level as the first fusion surface of the lamp holder to be welded and the first welding surface of the first workpiece. This allows the molten plastic extruded during welding to flow to the top surface of the rising part 41 and cool to form a sheet, preventing burrs from adhering to the outer wall of the workpiece and facilitating subsequent grinding and removal.

[0053] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

Claims

1. An ultrasonic welding system for irregularly shaped modified vehicle lights, comprising a welding device (1) and a welding head (2) slidably disposed on the welding device (1), for welding a first workpiece and a second workpiece of the irregularly shaped modified vehicle light to a lamp holder to be welded, characterized in that: The lamp holder to be welded has a first fusion surface and a second fusion surface; The ultrasonic welding system also includes a preliminary limiting bearing unit (3) and a rear support unit (4). The initial limiting bearing unit (3) includes a movable seat (31), a support part (32), and a release bearing part (33); The movable seat (31) is horizontally slidably mounted on the welding equipment (1); The support part (32) is located on the top of the movable seat (31). The support part (32) has a bearing surface (321) that is adapted to the outer edge of the lamp holder to be welded, and a mating surface (322) that is adapted to the bottom surface of the lamp holder to be welded. The release bearing part (33) is used to support the first workpiece and drive the first welding surface of the first workpiece and the first fusion surface of the lamp holder to be welded to a preliminary positioning welding state; The rear support unit (4) is used to contact the plastic material overflowing from the first workpiece when performing complete welding after the initial welding is completed.

2. The ultrasonic welding system for irregularly shaped modified vehicle lights according to claim 1, characterized in that: The bearing surface (321) is a plane, and the bearing surface (321) is parallel to the bottom of the lamp holder to be welded; the bonding surface (322) is a semi-circular groove structure, and the bonding surface (322) is in contact with the outer side of the extension end of the lamp holder to be welded; in the placed state, the lamp holder to be welded is in contact with both the bearing surface (321) and the bonding surface (322).

3. The ultrasonic welding system for irregularly shaped modified vehicle lights according to claim 1, characterized in that: Both the first workpiece and the second workpiece have a first welding surface and a second welding surface. The first welding surface is the outer edge of the bottom of the first workpiece and the second workpiece, and the second welding surface is the inner side wall of the first workpiece and the second workpiece. The top of the lamp holder to be welded has a first fusion surface and a second fusion surface, which correspond to the first welding surface and the second welding surface, respectively.

4. The ultrasonic welding system for irregularly shaped modified vehicle lights according to claim 3, characterized in that: The release bearing part (33) includes a vertical sliding part (331), a clamping cylinder (332), a clamping part (333), and a limiting part (334); the vertical sliding part (331) is slidably disposed on the welding equipment (1) in the vertical direction and located on the side of the moving seat (31); the clamping cylinder (332) is disposed on one side of the vertical sliding part (331), and the clamping cylinder (332) is fixedly connected to one side of the vertical sliding part (331); the clamping part (333) has a pair and is rotatably disposed on the output end of the clamping cylinder (332); the limiting part (334) has a plurality of parts, which are disposed on one side of the clamping part (333), and the top end face of the limiting part (334) can be in contact with the bottom outer edge of the first workpiece.

5. The ultrasonic welding system for irregularly shaped modified vehicle lights according to claim 4, characterized in that: Multiple limiting parts (334) have the same structure and the same height, and the extension ends of multiple limiting parts (334) are all separated from the second welding surface and the second fusion surface. When the clamping cylinder (332) is activated and the clamping part (333) is driven into a clamping state, the bottom outer edge of the first workpiece can be in contact with the top of the limiting part (334) in this state. In this state, the limiting part (334) can be in contact with the top of the first fusion surface of the lamp holder to be welded and drive the first welding surface of the first workpiece to maintain a preset distance from the first fusion surface.

6. The ultrasonic welding system for irregularly shaped modified vehicle lights according to claim 5, characterized in that: When there is a preset distance between the first welding surface of the first workpiece and the first fusion surface on the lamp holder to be welded, the second welding surface of the first workpiece can be in a contacting state with the second fusion surface on the lamp holder to be welded. In this contacting state, the welding head (2) descends and performs preliminary welding work on the first workpiece.

7. The ultrasonic welding system for irregularly shaped modified vehicle lights according to claim 6, characterized in that: The release bearing unit (33) also includes a frame (335) and a vertical drive unit (336); the frame (335) is mounted on the welding equipment (1) and is located beside the movable seat (31); the vertical drive unit (336) is located on the top of the frame (335), and the output end of the vertical drive unit (336) is fixedly connected to the vertical sliding part (331). When the vertical drive unit (336) is started, it can drive the vertical sliding part (331) to move in an upward or downward motion state.

8. The ultrasonic welding system for irregularly shaped modified vehicle lights according to claim 7, characterized in that: When the first workpiece is initially welded and the second workpiece needs to be welded, the clamping cylinder (332) drives the clamping part (333) and the limiting part (334) to detach from the bottom of the first workpiece. The vertical driving part (336) drives the vertical sliding part (331), the clamping cylinder (332) and the clamping part (333) to rise, so that the limiting part (334) stays on the outside of the first workpiece and the limiting part (334) is in contact with the outside of the first workpiece to maintain the position of the first workpiece on the lamp holder and provide a positioning reference for the second workpiece.

9. The ultrasonic welding system for irregularly shaped modified vehicle lights according to claim 4, characterized in that: The rear support unit (4) includes an ascending part (41) and a driving member (42); the ascending part (41) is slidably disposed on the movable seat (31) in the vertical direction, and the movable seat (31) has a slot for the ascending part (41) to pass through, the slot being located on the outer edge of the first workpiece and the lamp holder to be welded; the driving member (42) is disposed on the movable seat (31), and the output end of the driving member (42) is fixedly connected to the ascending part (41).

10. The ultrasonic welding system for irregularly shaped modified vehicle lights according to claim 9, characterized in that: When the welding head (2) performs complete welding on the first workpiece, the clamping part (333) is released, the limiting part (334) is separated from the outside of the first workpiece, and the rising part (41) rises, so that the top surface of the rising part (41) is on the same horizontal plane as the first fusion surface of the lamp holder to be welded and the first welding surface of the first workpiece.

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