Tailored blank laser welding device for car body panel production line

Abstract

The invention provides a tailored blank laser welding device for a car body panel production line, and relates to the technical field of tailored blank laser welding devices. A mounting part is arranged outside the external connecting part; a cleaning part is arranged outside the mounting part; a gun protection part is arranged outside the mounting part; a welding part is arranged in the gun protection part; when the welding head retracts, the six outwards-turned plastic plates fixedly connected with the inner wall can be rapidly closed to form a tight protective barrier, external impurities are effectively prevented from being attached to the welding head, interference of the impurities on laser transmission, focusing and other performance is avoided, the service life of the welding head is greatly prolonged, and the problem that in the continuous machining process, the welding head cannot be damaged easily is solved. The problems that due to the fact that a laser gun head is exposed in the machining environment for a long time, metal splashes, smoke dust and other impurities generated by welding are easily adsorbed, the laser energy transmission efficiency can be reduced through the impurities, the performance of the gun head is degraded, and even faults are caused are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of laser welding devices, and in particular to a laser welding device for a vehicle body panel production line. Background Art

[0002] In the field of automobile manufacturing, body panels are key components of the body structure, and their quality and performance play a vital role in the safety, comfort and appearance of the entire vehicle. The efficient and precise production of body panel production lines is one of the goals pursued by automobile manufacturers. Laser welding technology is the core process, which uses laser energy to automatically assemble and weld several steels, stainless steels, aluminum alloys, etc. of different materials, thicknesses and coatings to form an integral plate, profile or sandwich panel. This technology is deeply integrated with intelligent welding systems and intelligent heat treatment production lines to meet the diverse requirements of parts for material properties. Through intelligent control, it can achieve real-time adjustment of welding parameters and precise control of heat treatment processes. Therefore, it has been widely used in the automobile manufacturing industry.

[0003] For example, a device for suppressing smoke and spatter in laser welding proposed in application No. 202321266649.9 includes a rear presser foot, a front presser foot, an air blowing plate, a fume hood, a fume purifier, a vertical air curtain, a transverse air curtain and a side-axis protective air nozzle; the front presser foot and the rear presser foot in the welding fixture are both cavity structures with plugs at both ends, and the air blowing plate and the fume hood are respectively installed on both sides of the fixture, and the welding fume absorption effect is improved by the method of central blowing + two-side suction. At the same time, the combination of side-axis protective gas and transverse and vertical air curtains can prevent spatters from moving upward.

[0004] As for the current traditional laser welding equipment, the laser gun head is controlled by the CNC system to move to the splicing position of the body panel to perform welding operations. However, during the continuous processing, since the laser gun head is exposed to the processing environment for a long time, it is very easy to absorb metal spatter, smoke and other impurities generated by welding. These impurities adhere to key parts such as the gun head optical lens and nozzle, which will reduce the laser energy transmission efficiency and beam focusing accuracy, resulting in gun head performance degradation and even malfunction. At the same time, when the body panels are laser welded, the splicing parts are mostly unsurfaced blanks, and the blank surface itself has a certain degree of roughness. In addition, the debris, oil stains and other impurities generated during the processing will adhere to the welding area, which will change the optical properties and thermal conductivity of the welding area. This not only leads to unstable laser energy absorption rate, but also seriously affects the welding quality and joint strength of laser welding, making it difficult to meet the high-precision and high-reliability process requirements of the automotive manufacturing field for body structural parts. Summary of the Invention

[0005] The present invention relates to a laser welding device for a vehicle body panel production line, which comprises a gun protection portion and a cleaning portion. When the welding head retracts, the six outward-turned plastic plates fixed to the inner wall can quickly close to form a tight protective barrier, effectively preventing external impurities from adhering to the welding head. This not only avoids the interference of impurities on the laser transmission, focusing and other performances, but also greatly prolongs the service life of the welding head. Driven by a control motor and a docking block, the connecting rod and the cleaning block can be accurately driven to move. The cleaning block is in close contact with the welding position of the vehicle body panel, and can effectively remove impurities, rough protrusions, etc. on the surface of the blank, so that the welding position reaches an ideal clean and flat state.

[0006] The present invention provides a laser welding device for a vehicle body panel production line, which specifically includes an external connection part; the external connection part includes an external fixing frame; the external fixing frame is rotatably connected to a docking shaft frame on the outside; the docking shaft frame is fixedly connected to a control middle block on the outside; a mounting part is provided on the outside of the external connection part; a cleaning part is provided on the outside of the mounting part; the cleaning part includes a top mounting frame; the top mounting frame is rotatably connected to two groups of transmission gears on the inside; a group of transmission gears is fixedly connected to a connecting rod on the top; a cleaning block is fixedly connected to the end position of the connecting rod; a gun guard part is provided on the outside of the mounting part; the gun guard part includes a bottom sleeve; a replacement cylinder is threadedly connected to the end position of the bottom sleeve; six circumferentially distributed outward-turned plastic plates are fixedly connected to the inner wall of the replacement cylinder; a welding part is provided on the inside of the gun guard part.

[0007] Preferably, the external fixing frame is fixed to the external equipment; the reversing motor is fixed to the inside of the external fixing frame; the docking shaft frame is kept connected with the motor shaft of the reversing motor; a control center is provided inside the control middle block; a top connection groove is provided on the top of the control middle block; and a docking side groove is provided on the outer wall of the control middle block.

[0008] Preferably, the mounting portion includes a mounting frame; the mounting frame is fixed to the outer wall of the control block; a rectangular protrusion for being stuck in the docking side groove is fixed to the inner wall of the mounting frame; two groups of mounting grooves are opened on the mounting frame; the opening directions of the two groups of mounting grooves are opposite.

[0009] Preferably, a telescopic cylinder is fixedly connected to the inside of one group of the mounting slots; a control motor is fixedly connected to the inside of another group of the mounting slots; a docking block is rotatably connected to the outside of the mounting frame on one side of the control motor; there are two groups of docking blocks; the other group of docking blocks is rotatably connected to the inside of the top connecting slot; the external exposed ends of the two groups of docking blocks are respectively provided with hexagonal protrusions; the motor shaft of the control motor remains connected to the corresponding docking block.

[0010] Preferably, two groups of sleeves are provided at the bottom of the top mounting frame; the interior of the top mounting frame is a cavity structure; axial holes are respectively provided on the upper and lower sides of the top mounting frame; the top mounting frame is fixedly connected to the top of the control block through a group of sleeves; the top mounting frame is fixedly connected to the mounting frame through another group of sleeves; the two groups of transmission gears are connected through latches; docking sockets are respectively provided at the bottom of the two groups of transmission gears; the two groups of transmission gears are respectively docked with the corresponding docking blocks through the docking sockets at the bottom; a connecting rod is fixedly connected to the top of the transmission gear on the same side as the control motor.

[0011] Preferably, the bottom connecting sleeve is fixedly connected to the control middle block; the interior of the bottom connecting sleeve is a cavity structure, and a threaded groove is provided on the outer wall of the end of the bottom connecting sleeve; two groups of constraint grooves are provided on the outer wall of the bottom connecting sleeve; a fixed sleeve is fixedly connected to the outer wall of the bottom connecting sleeve; two groups of rectangular protrusions are fixedly connected to the outer wall of the fixed sleeve, and a regulating component is provided inside the fixed sleeve.

[0012] Preferably, calibration frames are respectively fixed to the two groups of rectangular protrusions on the outer wall of the fixed sleeve; the two groups of calibration frames are respectively connected to the regulating components inside the fixed sleeve, and calibrators are respectively provided at the end positions of the two groups of calibration frames; adjustment blocks are respectively provided on the two groups of rectangular protrusions on the outer wall of the fixed sleeve; the two groups of adjustment blocks are respectively electrically connected to the regulating components inside the fixed sleeve.

[0013] Preferably, the welding portion includes a synchronous frame; the synchronous frame is slidably connected to the outside of the bottom sleeve, and a rectangular protrusion is provided on the outside of the synchronous frame, and the rectangular protrusion of the synchronous frame is maintained in connection with the telescopic shaft of the telescopic cylinder; two groups of internal connection blocks are fixed on the inner wall of the synchronous frame; the two groups of internal connection blocks are respectively slidably connected in relative constraint grooves.

[0014] Preferably, the two groups of internal connection blocks are fixed with welding control blocks; the welding control blocks are slidably connected to the inside of the bottom connection sleeve; the welding control blocks are electrically connected to the control center inside the control middle block; the end position of the welding control blocks is fixed with welding heads; the welding heads can extend from the outer plastic plate.

[0015] The laser welding device for a vehicle body panel production line provided by the present invention has the following beneficial effects: In the present invention, the top mounting frame of the cleaning part is stably installed and fixes other structures to ensure the stability of the cleaning work. The two sets of transmission gears cooperate with each other through the locking teeth. Under the drive of the control motor and the docking block, they can accurately drive the connecting rod and the cleaning block to move. The cleaning block is in close contact with the welding position of the vehicle body panel, which can effectively remove impurities, rough protrusions, etc. on the surface of the blank, so that the welding position reaches an ideal clean and flat state, providing a good foundation for subsequent laser welding, significantly improving the welding quality, and reducing the occurrence of welding defects.

[0016] In addition, the telescopic cylinder in the installation part works in conjunction with the synchronization frame to accurately control the position of the welding part, so that the welding head can accurately extend from the replacement cylinder and reach the predetermined welding position. At the same time, the calibrator on the calibration frame cooperates with the control components and adjustment blocks inside the fixed sleeve to monitor and adjust the welding position in real time during the welding process, ensuring the high accuracy of the welding position, effectively improving the welding quality, and ensuring the splicing accuracy and overall performance of the body panel.

[0017] In addition, the bottom sleeve in the gun guard is threadedly connected to the replacement barrel, with a simple structure and easy installation and disassembly. When the welding head retracts, the six outward-turned plastic plates fixed to the inner wall can quickly close to form a tight protective barrier, effectively preventing external impurities from adhering to the welding head. This not only ensures the cleanliness of the welding head in the non-working state and avoids the interference of impurities on laser transmission, focusing and other performance, but also greatly extends the service life of the welding head and reduces equipment maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments are briefly introduced below.

[0019] The drawings described below only relate to some embodiments of the present invention, but are not intended to limit the present invention.

[0020] In the attached figure: Figure 1 A schematic diagram of a three-dimensional assembly structure according to an embodiment of the present invention is shown; Figure 2 A schematic diagram of a bottom-view structure of a three-dimensional assembly according to an embodiment of the present invention is shown; Figure 3 A schematic diagram showing a decomposition structure according to an embodiment of the present invention; Figure 4 A schematic diagram of an exploded bottom-up structure according to an embodiment of the present invention is shown; Figure 5 A schematic diagram of a partially cutaway structure according to an embodiment of the present invention is shown; Figure 6 The embodiment of the present invention is shown. Figure 5 The schematic diagram of the enlarged structure of part A is shown; Figure 7 A schematic diagram showing an assembly structure of an external connection portion according to an embodiment of the present invention is shown; Figure 8 A schematic diagram showing an assembly structure of a mounting portion according to an embodiment of the present invention is shown; Figure 9 A schematic diagram showing an assembly structure of a cleaning portion according to an embodiment of the present invention is shown; Figure 10A schematic diagram showing an assembly structure of a gun guard according to an embodiment of the present invention is shown; Figure 11 A schematic diagram showing a welding portion assembly structure according to an embodiment of the present invention is shown.

[0021] Reference Signs List 1. External connection part; 101. External fixing frame; 102. Reversing motor; 103. Docking shaft frame; 104. Control center block; 105. Top connection groove; 106. Docking side groove; 2. Mounting part; 201. Mounting frame; 202. Mounting slot; 203. Telescopic cylinder; 204. Control motor; 205. Docking block; 3. Cleaning unit; 301. Top mounting frame; 302. Transmission gear; 303. Docking jack; 304. Connecting rod; 305. Cleaning block; 4. Gun guard; 401. Bottom sleeve; 402. Constraint slot; 403. Replacement sleeve; 404. External plastic plate; 405. Fixed sleeve; 406. Calibration frame; 407. Adjustment block; 5. Welding part; 501. Synchronous frame; 502. Internal connection block; 503. Welding control block; 504. Welding head. DETAILED DESCRIPTION

[0022] The embodiments of the present invention are described in further detail below with reference to the accompanying drawings and examples.

[0023] Example 1: Please refer to Figures 1 to 11: The present invention proposes a laser welding device for a vehicle body panel production line, comprising an external connection part 1; the external connection part 1 comprises an external fixing frame 101; the external fixing frame 101 is used to assist in installing other structures of the device and to maintain the overall stability of the device by being fixed to external equipment; the external rotation of the external fixing frame 101 is connected to a docking shaft frame 103; the docking shaft frame 103 is used to adjust the control block 104 under the drive of the reversing motor 102 to convert the welding and cleaning states of the panel; the external of the docking shaft frame 103 is fixed to the control center Block 104; the control block 104 is used to facilitate the cleaning of the welding position of the vehicle body panel by cooperating with the welding control block 503 and the welding head 504; the external portion 1 is provided with a mounting portion 2; the external portion 2 is provided with a cleaning portion 3; the cleaning portion 3 includes a top mounting frame 301; the top mounting frame 301 is used to assist in the installation and fixation of other structures of the cleaning portion 3 to facilitate the overall stability of the cleaning portion 3; the internal rotation of the top mounting frame 301 is connected to two sets of transmission gears 302; the transmission gear 302 is used to rotate the connecting rod 304 and the cleaning block 3 during the rotation process. 05 is controlled to facilitate cleaning of the welding position of the vehicle body panel; a connecting rod 304 is fixedly connected to the top of a group of transmission gears 302; the connecting rod 304 is used to connect the cleaning block 305 and the transmission gear 302; convenient connection and synchronization adjustment; the end position of the connecting rod 304 is fixedly connected to the cleaning block 305; the cleaning block 305 is used to contact the welding position of the vehicle body panel to clean the welding position during the contact process; the outside of the mounting portion 2 is provided with a gun guard 4; the gun guard 4 includes a bottom sleeve 401; the bottom sleeve 4 01 is threadedly connected to the end of the replacement cylinder 403; the bottom sleeve 401 is used to assist in the installation and fixation of other structures of the gun guard 4, so as to facilitate maintaining stability while constraining the welding part 5 to maintain its stability during the adjustment process; six circumferentially distributed outward plastic plates 404 are fixed to the inner wall of the replacement cylinder 403; the outward plastic plates 404 are used to perform a closing process during the retraction of the welding head 504 to prevent external impurities from entering the welding head 504, thereby protecting the welding head 504; a welding part 5 is provided inside the gun guard 4.

[0024] Example 2: Based on Example 1, Figures 1 to 11As shown, the outer fixing frame 101 is fixed to the external equipment; the reversing motor 102 is fixed to the inside of the outer fixing frame 101; the reversing motor 102 is used to control the control block 104, so that the cleaning part 3 and the gun protection part 4 are reversing, so as to facilitate the conversion of the welding and cleaning states of the enclosure; the docking axis frame 103 is connected to the motor shaft of the reversing motor 102; a control center is provided inside the control block 104; a top connection groove 105 is provided on the top of the control block 104; the top connection groove 105 is used to assist in docking with a group of docking blocks 205; a docking side groove 106 is provided on the outer wall of the control block 104; the docking side groove 106 is used to assist in connecting the mounting frame 201, so as to facilitate the stability of the connection between the mounting frame 201 and the control block 104.

[0025] The mounting portion 2 includes a mounting frame 201; the mounting frame 201 is fixedly connected to the outer wall of the control middle block 104; a rectangular protrusion for being stuck in the docking side groove 106 is fixedly connected to the inner wall of the mounting frame 201; the mounting frame 201 is used to cooperate with the mounting groove 202 to fix the telescopic cylinder 203 and the control motor 204, so as to facilitate the stability of both and facilitate their use; two groups of mounting grooves 202 are opened on the mounting frame 201; the opening directions of the two groups of mounting grooves 202 are opposite; the mounting grooves 202 are used to assist in fixing the telescopic cylinder 203 and the control motor 204, so as to facilitate the stability of both.

[0026] The interior of one group of mounting grooves 202 is fixedly connected with a telescopic cylinder 203; the telescopic cylinder 203 is used to control the synchronous frame 501 to adjust the position, so as to facilitate the adjustment of the relative position of the welding part 5 and to facilitate the control of the welding head 504 to extend from the replacement cylinder 403; the interior of another group of mounting grooves 202 is fixedly connected with a control motor 204; the control motor 204 is used to cooperate with the docking block 205 to drive the transmission gear 302 to control the cleaning block 305 to clean the welding position of the vehicle body panel; the mounting frame 201 on one side of the control motor 204 is externally rotatably connected with the docking block 205; the docking block 205 is provided with two groups; the other group of docking blocks 205 is rotatably connected to the interior of the top connecting groove 105; the external exposed ends of the two groups of docking blocks 205 are respectively provided with hexagonal prism-shaped protrusions; the motor shaft of the control motor 204 is kept connected to the corresponding docking block 205; the docking block 205 is used to control the control motor 204 and the transmission gear 302, so as to facilitate its rotation adjustment.

[0027] Two groups of sleeves are provided at the bottom of the top mounting frame 301; the interior of the top mounting frame 301 is a cavity structure; axial holes are respectively provided on the upper and lower sides of the top mounting frame 301; the top mounting frame 301 is fixedly connected to the top of the control middle block 104 through a group of sleeves; the top mounting frame 301 is fixedly connected to the mounting frame 201 through another group of sleeves; the two groups of transmission gears 302 are connected by latches; the bottoms of the two groups of transmission gears 302 are respectively provided with docking sockets 303; the docking sockets 303 are used to assist in connecting with the docking block 205, so as to facilitate the maintenance of the stability of the adjustment of the transmission gear 302; the two groups of transmission gears 302 are respectively docked with the corresponding docking blocks 205 through the docking sockets 303 at the bottom; a connecting rod 304 is fixed to the top of the transmission gear 302 on the same side as the control motor 204.

[0028] The bottom connecting sleeve 401 is fixedly connected to the control middle block 104; the interior of the bottom connecting sleeve 401 is a cavity structure, and a threaded groove is provided on the outer wall of the end of the bottom connecting sleeve 401; two groups of constraint grooves 402 are provided on the outer wall of the bottom connecting sleeve 401; the constraint grooves 402 are used to assist in the installation of the internal block 502, so as to maintain its stability during the adjustment process; a fixed sleeve 405 is fixedly connected to the outer wall of the bottom connecting sleeve 401; two groups of rectangular protrusions are fixedly connected to the outer wall of the fixed sleeve 405, and a regulating component is provided inside the fixed sleeve 405; the fixed sleeve 405 is used to assist in fixing the calibration frame 406 so as to perform synchronous calibration processing through the calibrator.

[0029] Calibration frames 406 are respectively fixed to the two groups of rectangular protrusions on the outer wall of the fixed sleeve 405; the two groups of calibration frames 406 are respectively connected to the regulating components inside the fixed sleeve 405, and the end positions of the two groups of calibration frames 406 are respectively provided with calibrators; the calibration frames 406 are used to perform welding processing through the calibrator during the welding process to maintain the stability of the welding position; adjustment blocks 407 are respectively provided on the two groups of rectangular protrusions on the outer wall of the fixed sleeve 405; the two groups of adjustment blocks 407 are respectively electrically connected to the regulating components inside the fixed sleeve 405; the adjustment blocks 407 are used to assist in adjusting the calibration frames 406.

[0030] The welding part 5 includes a synchronous frame 501; the synchronous frame 501 is slidably connected to the outside of the bottom sleeve 401, and a rectangular protrusion is provided on the outside of the synchronous frame 501, and the rectangular protrusion of the synchronous frame 501 is kept connected to the telescopic shaft of the telescopic cylinder 203; the synchronous frame 501 is used to assist in the installation and fixation of other structures of the welding part 5, and adjust the relative position of the welding part 5 under the action of the telescopic cylinder 203; two groups of internal blocks 502 are fixed to the inner wall of the synchronous frame 501; the two groups of internal blocks 502 are respectively slidably connected in the relative constraint grooves 402; the internal blocks 502 are used to fix the welding control block 503 to keep it stable.

[0031] The two groups of internal connection blocks 502 are fixedly connected with the welding control block 503; the welding control block 503 is slidably connected to the inside of the bottom connection sleeve 401; the welding control block 503 is electrically connected to the control center inside the control middle block 104; the welding control block 503 is used to control the welding head 504 to cooperate with the welding head 504 to weld the welding position of the vehicle body panel; the end position of the welding control block 503 is fixed with the welding head 504; the welding head 504 can be extended from the outside plastic plate 404; the welding head 504 is used to weld the vehicle body panel.

[0032] Specific usage and function of this embodiment: In the present invention, the outer frame 101 is firmly fixed to the external equipment by bolts or welding, providing a stable installation base for the entire device. The reversing motor 102 is pre-installed inside the outer frame 101, and its motor shaft is connected to the docking shaft frame 103 by a coupling to ensure the stability of power transmission; When cleaning the vehicle body panel, the control center inside the control block 104 starts the reversing motor 102, and the reversing motor 102 drives the docking shaft frame 103 to rotate, so that the control block 104 is reversed and the cleaning part 3 is rotated to the working position. Then, the control motor 204 is started, and the transmission gear 302 is driven to rotate through the docking block 205. Since the two sets of transmission gears 302 are meshed with each other, the two sets of transmission gears 302 rotate at the same time. When the transmission gear 302 rotates, the cleaning block 305 is driven to move through the connecting rod 304. The cleaning block 305 contacts the welding position of the vehicle body panel. During the contact process, the cleaning block 305 cleans impurities, debris, etc. on the surface of the welding position, removes unevenness and attachments on the surface of the blank, and ensures that the welding position reaches an ideal cleaning state. When welding the body panels, the control center starts the reversing motor 102 again, rotates the gun guard 4 and the welding part 5 to the working position, and the telescopic cylinder 203 is started. Its telescopic shaft drives the synchronous frame 501 to slide outward along the bottom sleeve 401, so that the welding head 504 extends from the replacement cylinder 403 until it reaches the predetermined welding position. During this process, the calibrator on the calibration frame 406 calibrates the welding position of the body panels in real time. If a deviation is found in the welding position, the control center adjusts the calibration frame 406 through the adjustment block 407 to ensure the accuracy of the welding position. When the welding head 504 reaches the correct position, the welding control block 503 starts the welding head 504 according to the instruction of the control center, and performs laser welding on the welding position of the body panels. During the welding process, the welding control block 503 monitors the welding parameters in real time and adjusts them according to the actual situation to ensure the welding quality. After welding is completed, the telescopic cylinder 203 drives the synchronous frame 501 to retract, and the welding head 504 gradually retracts into the replacement cylinder 403. As the welding head 504 retracts, the outward plastic plate 404 gradually closes under its own elastic action, forming a sealed protection for the welding head 504, preventing external impurities from entering the welding head 504 and avoiding affecting its subsequent normal use.

[0033] In this article, there are several points to note: 1. The drawings of the embodiments of the present disclosure only relate to the structures related to the embodiments of the present disclosure. Other structures may refer to conventional designs.

[0034] 2. In the absence of conflict, the embodiments of the present disclosure and the features therein may be combined with each other to form new embodiments.

[0035] The above are only specific embodiments of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this disclosure should be included in the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection of the claims.

Claims

1. A laser welding device for a vehicle body panel production line, comprising an external connection portion (1); characterized in that: The external connection part (1) includes an external fixing frame (101); the external part of the external fixing frame (101) is rotatably connected to a docking shaft frame (103); the external part of the docking shaft frame (103) is fixedly connected to a control middle block (104); the external part of the external connection part (1) is provided with a mounting part (2); the external part of the mounting part (2) is provided with a cleaning part (3); the cleaning part (3) includes a top mounting frame (301); the internal part of the top mounting frame (301) is rotatably connected to two sets of transmission gears (302); one set of the transmission gears A connecting rod (304) is fixedly connected to the top of (302); a cleaning block (305) is fixedly connected to the end of the connecting rod (304); a gun protecting portion (4) is provided on the outside of the mounting portion (2); the gun protecting portion (4) includes a bottom connecting sleeve (401); a replacement cylinder (403) is threadedly connected to the end of the bottom connecting sleeve (401); six outer plastic plates (404) distributed in a circumferential manner are fixedly connected to the inner wall of the replacement cylinder (403); a welding portion (5) is provided on the inside of the gun protecting portion (4).

2. The laser welding device for a vehicle body panel production line according to claim 1, characterized in that: The outer fixing frame (101) is fixed to an external device; a reversing motor (102) is fixed inside the outer fixing frame (101); the docking shaft frame (103) is connected to the motor shaft of the reversing motor (102); a control center is provided inside the control middle block (104); a top connection groove (105) is provided on the top of the control middle block (104); and a docking side groove (106) is provided on the outer wall of the control middle block (104).

3. The laser welding device for a vehicle body panel production line according to claim 2, characterized in that: The mounting portion (2) comprises a mounting frame (201); the mounting frame (201) is fixedly connected to the outer wall of the control middle block (104); a rectangular protrusion for being clamped in the docking side groove (106) is fixedly connected to the inner wall of the mounting frame (201); two groups of mounting grooves (202) are opened on the mounting frame (201); the opening directions of the two groups of mounting grooves (202) are opposite to each other.

4. The laser welding device for a vehicle body panel production line according to claim 3, characterized in that: A telescopic cylinder (203) is fixedly connected to the interior of one group of the mounting grooves (202); a control motor (204) is fixedly connected to the interior of another group of the mounting grooves (202); a docking block (205) is rotatably connected to the exterior of the mounting frame (201) on one side where the control motor (204) is mounted; two groups of docking blocks (205) are provided; the other group of docking blocks (205) is rotatably connected to the interior of the top connecting groove (105); hexagonal prism-shaped protrusions are respectively provided on the externally exposed ends of the two groups of docking blocks (205); the motor shaft of the control motor (204) is kept connected to the corresponding docking block (205).

5. The laser welding device for a vehicle body panel production line according to claim 4, characterized in that: The bottom of the top mounting frame (301) is provided with two sets of sleeves; the interior of the top mounting frame (301) is a cavity structure; the upper and lower sides of the top mounting frame (301) are respectively provided with shaft holes; the top mounting frame (301) is fixedly connected to the top of the control middle block (104) through a set of sleeves; the top mounting frame (301) is fixedly connected to the mounting frame (201) through another set of sleeves; the two sets of transmission gears (302) are connected through the latch teeth; the bottoms of the two sets of transmission gears (302) are respectively provided with docking sockets (303); the two sets of transmission gears (302) are respectively maintained in docking with the corresponding docking blocks (205) through the docking sockets (303) at the bottoms; A connecting rod (304) is fixedly connected to the top of the transmission gear (302) on the same side as the control motor (204).

6. The laser welding device for a vehicle body panel production line according to claim 4, characterized in that: The bottom connecting sleeve (401) is fixedly connected to the control middle block (104); the interior of the bottom connecting sleeve (401) is a cavity structure, and a threaded groove is provided on the outer wall of the end of the bottom connecting sleeve (401); two groups of constraint grooves (402) are provided on the outer wall of the bottom connecting sleeve (401); a fixed sleeve frame (405) is fixedly connected to the outer wall of the bottom connecting sleeve (401); two groups of rectangular protrusions are fixedly connected to the outer wall of the fixed sleeve frame (405), and a regulating component is provided inside the fixed sleeve frame (405).

7. The laser welding device for a vehicle body panel production line according to claim 6, characterized in that: Calibration frames (406) are fixedly connected to the two groups of rectangular protrusions on the outer wall of the fixed sleeve (405); the two groups of calibration frames (406) are respectively connected to the regulating components inside the fixed sleeve (405), and the end positions of the two groups of calibration frames (406) are respectively provided with calibrators; the two groups of rectangular protrusions on the outer wall of the fixed sleeve (405) are respectively provided with regulating blocks (407); the two groups of regulating blocks (407) are respectively electrically connected to the regulating components inside the fixed sleeve (405).

8. The laser welding device for a vehicle body panel production line according to claim 6, characterized in that: The welding portion (5) includes a synchronous frame (501); the synchronous frame (501) is slidably connected to the outside of the bottom sleeve (401); a rectangular protrusion is provided on the outside of the synchronous frame (501); the rectangular protrusion of the synchronous frame (501) is connected to the telescopic shaft of the telescopic cylinder (203); two groups of internal connection blocks (502) are fixed to the inner wall of the synchronous frame (501); the two groups of internal connection blocks (502) are respectively slidably connected in the opposite constraint grooves (402).

9. The laser welding device for a vehicle body panel production line according to claim 8, characterized in that: The two groups of internal connection blocks (502) are fixedly connected with welding control blocks (503); the welding control blocks (503) are slidably connected to the inside of the bottom connection sleeve (401); the welding control blocks (503) are electrically connected to the control center inside the control middle block (104); the end position of the welding control block (503) is fixedly connected with a welding head (504); the welding head (504) can extend from the outside plastic plate (404).

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