A front laser radar double-color paint spraying special shielding tool and a suspension conveying paint spraying method thereof
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HUAZE (JIAXING) AUTO PARTS CO LTD
- Filing Date
- 2026-06-09
- Publication Date
- 2026-07-21
Smart Images
Figure CN122424941A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of tooling technology for painting and processing automotive radar components, specifically a special masking tooling for dual-color painting of a front lidar and its suspended conveying and painting method. Background Technology
[0002] As a core sensing component of autonomous driving systems, the exterior shell of a vehicle-mounted LiDAR is a high-precision structural part that must simultaneously meet the dual requirements of overall vehicle aesthetics and radar signal transmission. To achieve a unified appearance and functional partitioning, the industry generally requires a two-tone spray coating of high-gloss black and metallic silver on the LiDAR shell surface. This two-tone coating process has extremely stringent standards for the smoothness of the color boundaries, the regularity of the lines, the absence of color bleeding, and the absence of overspray, making it a core process that determines the radar's appearance quality and market competitiveness.
[0003] Currently, the industry primarily uses the traditional masking method of manually applying high-temperature masking tape and masking film for two-color painting of front LiDAR housings. This method has revealed numerous insurmountable technical flaws in actual production, making it unsuitable for the mass production demands of precision automotive components: Firstly, color separation accuracy is difficult to guarantee. Manual film application relies entirely on the operator's experience and skill, easily leading to problems such as film misalignment, edge curling, and uneven application. This results in jagged, skewed, and inconsistent widths at the two-color painting boundary, failing to meet the quality inspection standards for high-end automotive components. Secondly, color bleeding and overspray are serious problems. High-gloss black paint has fine atomized particles, while metallic silver paint contains metallic powder particles. These two different types of paint easily seep and spread through gaps and edges in the manually applied film, causing color bleeding, surface dirt, and hazy edges. Furthermore, once color bleeding occurs between the high-gloss and metallic paint surfaces, it cannot be repaired. First, it can directly scrap the product, significantly increasing production costs. Second, it has low production efficiency. Manual masking requires many tedious processes such as alignment, film application, compaction, trimming, and film removal. The cycle time for a single piece is long, highly dependent on manual labor, and difficult to adapt to the continuous batch production rhythm of overhead conveyor lines. Third, the paint surface is easily damaged. Manual film application can leave adhesive residue on the workpiece surface, and the film removal process can easily bring off the incompletely cured paint surface, causing edge peeling and paint loss. At the same time, the operating standards of different operators vary greatly, resulting in poor consistency of the spraying quality of batch products. Fourth, the existing general masking tooling has poor adaptability and lacks targeted design for the irregular curved surface and exclusive contour structure of the front lidar shell, making it impossible to achieve seamless masking and failing to fundamentally solve the process pain points of two-color spraying. Summary of the Invention
[0004] To address the shortcomings of existing technologies, this invention provides a special masking fixture for front lidar dual-color spray painting and its suspended conveyor spray painting method. This solves the problems of color separation difference, easy color mixing, low efficiency, paint damage, and poor compatibility in the traditional manual film application and general-purpose fixtures for front lidar dual-color spray painting, which cannot meet the needs of mass production.
[0005] To achieve the above objectives, the present invention provides the following technical solution: a special masking fixture for dual-color spray painting of a front lidar system, comprising a base frame, a limiting frame, a docking platform, and an assembly platform. A fixed frame is fixedly connected to the top center of the base frame. Universal wheels are installed at the four corners of the bottom of the base frame. A fan is fixedly connected to the front end of the base frame. A loading frame is fixedly connected to the top of the fan at the front end of the base frame. A workbench is fixedly connected to the bottom of the base frame. Support frames are fixedly connected to the left and right sides of the top of the workbench. A contoured cavity shell is fixedly connected to the top of each support frame. A front vehicle shell is fitted on the upper side of the contoured cavity shell. A lidar shell is fixedly connected to the inner side of the front vehicle shell. The outer wall of the rear end of the limiting frame is rotatably connected to the top side of the base frame. Connecting frames are fixedly connected to the left and right sides of the outer wall of the limiting frame. A rotating rod is rotatably connected to the rear end of the limiting frame. A locking plate is rotatably connected to the outer wall of the rotating rod. A torsion rod is rotatably connected to the rear end of the locking plate. When the torsion rod rotates, it is connected to the fixed frame through the locking component. The outer wall of the docking platform is mounted on the outer wall of the connecting frame rod. The docking platform and the assembly platform are connected by an assembly assembly. The outer wall of the assembly platform is respectively mounted with a metallic silver area shielding plate and a high-gloss black area shielding plate. The outer wall of the high-gloss black area shielding plate is hung on the outside of the loading frame.
[0006] Preferably, the locking assembly includes a paddle slidably connected to the inner wall of the locking plate, a strong spring is provided on the inner side of the paddle, the other end of the strong spring in the paddle is fixedly connected to the inner wall of the locking plate, a locking rod is rotatably connected to the bottom inner wall of the locking plate through a torsion spring, a locking tooth is fixedly connected to the middle of the rotating rod, the rotating rod and the torsion rod are rotatably connected to a connecting rod, the rotation of the torsion rod drives the rotation of the rotating rod synchronously through the connecting rod, the paddle abuts against the inner side of the locking rod, and the locking rod covers the rod part of the rear side of the fixed frame to form a lock.
[0007] Preferably, the assembly component includes wedge-shaped grooves on the inner side of the docking platform that fit with the upper part of the assembly platform. The top of the assembly platform can be fitted onto the inner side of the docking platform. A connecting block is fixedly connected to the outer wall of the front end of the docking platform. A locking block is rotatably connected to the inner side of the connecting block via a torsion spring. A fixing ring is rotatably connected to the inner wall of the locking block. A U-shaped frame is fixedly connected to the front side of the assembly platform. The outer wall of the fixing ring is fitted inside the U-shaped frame.
[0008] Preferably, air pipes are fixedly connected to both the fan output end and the inner wall of the assembly table. The air pipe at the workbench passes through the outer wall of the connecting frame and extends into the inner wall of the docking table. The air pipes on the inner wall of the assembly table pass through the high-gloss black area shielding plate and the metallic silver area shielding plate respectively and are installed thereon.
[0009] Preferably, an air ring is fitted on the inner wall of the bottom end of the metal silver area shielding plate. The air pipe output end that passes through the metal silver area shielding plate at the assembly table is fixedly connected to and passes through the air ring. An arc-shaped sealing ring is fixedly connected to both sides of the outer wall of the rightmost air ring on the inner wall of the bottom end of the assembly table. The outer wall of the arc-shaped sealing ring is close to the top side of the lidar housing, thus completing the shielding of the metal silver sprayed area of the lidar housing.
[0010] Preferably, a cover plate is fixedly connected to the bottom end of the high-gloss black area shielding plate, and an air ring II is sleeved on the inner wall of the bottom end of the cover plate. The air pipe output end that passes through the high-gloss black area shielding plate at the assembly table is fixedly connected to the outer wall of the air ring II. Arc-shaped sealing ring II is rotatably connected to both sides of the outer wall of the air ring II. The outer wall of the arc-shaped sealing ring II is close to the outer side of the lidar housing, thus completing the shielding of the high-gloss black sprayed area of the lidar housing.
[0011] Preferably, a fixed pipe is fixedly connected to the inner wall of the air pipe at the output end of the fan, a sealing shell is fixedly connected to the bottom of the inner wall of the fixed pipe, a light spring is sleeved on the outer wall of the sealing shell, a movable pipe is fixedly connected to the other end of the light spring, and the inner wall of the top end of the movable pipe is fitted onto the ball component at the top end of the sealing shell.
[0012] A method for suspending and conveying paint spraying using a special masking fixture for dual-color spraying with front lidar includes the following steps: S1. Workpiece positioning: Move the base frame to the corresponding workstation of the overhead conveyor line via the casters, and put the front car body on the outside of the contoured cavity shell connected to the support frame at the top of the workbench, so that the lidar shell is precisely positioned with the front car body. S2, Tooling Locking: Rotate the limiting frame to cover the outside of the front body, and use the locking plate in conjunction with the locking components to lock and fix the frame, ensuring the stability of the connecting frame and docking platform. S3. Preparation for the first color coating: Connect the metallic silver area masking plate through the assembly components of the assembly table and docking table. Start the fan and inflate the air ring at the bottom of the metallic silver area masking plate through the air pipe, so that the arc-shaped sealing ring is tightly attached to the edge of the metallic silver coating area of the lidar shell, and the sealing and masking are completed. S4. High-gloss black spraying: The tooling is sent to the high-gloss black spraying station by the overhead conveyor line to complete the spraying and curing of the high-gloss black area of the lidar shell. S5. Masking Switching: Turn off the fan and release the gas in the first air ring. Remove the silver metal area masking plate through the assembly components and replace it with the high-gloss black area masking plate. Start the fan again to inflate the second air ring at the bottom of the high-gloss black area masking plate, so that the second arc-shaped sealing ring is tightly attached to the edge of the high-gloss black sprayed area of the lidar shell, and the sealing masking is completed. S6, Metallic Silver Spraying: The tooling is sent to the metallic silver spraying station by the overhead conveyor line to complete the spraying and curing of the metallic silver area of the lidar shell. S7. Demolding and Part Removal: Release the gas inside the second gas ring, unlock the locking components and rotate to open the limiting frame, and remove the painted front body and lidar housing.
[0013] Preferably, in steps S3 and S5, when the blower fills the air pipe with air, the gas pushes the movable pipe inside the fixed pipe downward, exposing the ball component at the top of the sealing shell, and the gas enters the corresponding air ring through the air pipe. When the blower stops inflating, the lightweight spring drives the moving tube to reset and seal the sealing shell, maintaining the expansion state of air ring one or air ring two, and maintaining the sealed fit between arc sealing ring one or arc sealing ring two and the lidar housing, preventing color bleeding and paint overspray during the spraying process.
[0014] Preferably, the operation process of the locking component in step S2 is as follows: lift the torsion bar, drive the rotating bar to rotate through the adapter rod, so that the locking tooth moves the lever to disengage from the locking bar, press down the locking plate so that it is sleeved on the fixed frame rod body, the locking bar is reset under the action of the torsion spring and covers the rear rod body of the fixed frame, and after the torsion bar is released, the lever engages with the locking bar under the action of the strong spring to complete the locking. In step S5, when switching the masking plate, the locking block is pried open to disengage the fixing ring from the U-shaped frame. The assembly table and the corresponding masking plate are then slid off along the wedge groove on the inner side of the docking platform. After replacement, the new assembly table is embedded into the wedge groove. The locking block is pried open to fit the fixing ring onto the U-shaped frame. After the locking block is released, the fixing ring is reset under the action of the second torsion spring, thus achieving rapid switching of the two-color spraying process.
[0015] Working principle: First, the entire chassis is moved to the work location using casters. Then, the front body is fitted onto the contoured cavity shell set on the workbench. The outer side of the contoured cavity shell is soft, allowing it to fit snugly against the inner side of the front body, preventing damage to the inner side of the front body. Then, the limiting frame and connecting frame are rotated to cover the outer side of the front body, allowing the metallic silver area shielding plate or high-gloss black area shielding plate connected to the assembly table at the docking station to fit snugly against the front body. During this process, the locking plate set at the limiting frame can be sleeved on the rod of the fixed frame. By lifting the torsion rod, the torsion rod, under the action of the adapter rod, drives the rotating rod to rotate, so that the locking teeth of the rotating rod can move the paddle to disengage from the locking rod. After the locking rod is released, the operator can press down the locking plate so that the locking plate and the locking rod are sleeved on the fixed frame. During this process, due to the limitation of the torsion spring, the locking rod can be bent and then quickly reset. After releasing the torsion rod, the paddle can be locked on the locking rod again under the influence of the strong spring, thus completing the locking. This allows the limiting frame to be stably sleeved on the fixed frame, and the limiting frame and the connecting frame cover the outside of the front body. During the use of the metallic silver area masking plate or the high-gloss black area masking plate, the wedge-shaped grooves provided on both allow the assembly table to slide onto the inner side of the docking table. Then, the locking block is moved to fit the fixing ring onto the U-shaped frame, and the locking block is released. The locking block can be reset under the action of the torsion spring II and locked onto the U-shaped frame together with the fixing ring. After that, the assembly of the metallic silver area masking plate or the high-gloss black area masking plate is completed. The metallic silver area masking plate and the high-gloss black area masking plate are used to mask the metallic silver spraying area or the high-gloss black spraying area respectively, thus completing the two-color spraying work. During the bonding and installation process, the workbench is started and inflated into the air pipe. This causes the air pipe at the assembly table to expand against air ring one or air ring two. As air ring one or air ring two expands, the corresponding arc-shaped sealing ring one or arc-shaped sealing ring two twists outward, allowing the arc-shaped sealing ring one or arc-shaped sealing ring two to better and more stably adhere to the lidar housing, reducing damage such as color bleeding and paint overspray during the painting process. During inflation, a fixed tube is installed inside the air tube. The fixed tube creates a one-way ventilation effect during air tube inflation. When the moving tube is inflated, it can be pushed down, exposing the sealing shell and allowing gas to pass through the fixed tube and exit from the air tube. When the worktable stops inflating, a light spring can use its elasticity to make the top of the moving tube abut against the spherical component at the sealing shell, completing the corresponding sealing and preventing gas backflow from the air tube at the assembly table. This maintains the expansion effect of air ring one or air ring two, thus achieving a tight seal.
[0016] This invention provides a special masking fixture for dual-color spray painting using a front-facing lidar system and its suspended conveyor spray painting method. It offers the following advantages: 1. This invention achieves precise positioning of the front car body and the lidar housing with zero gap through a contoured cavity shell, and with interchangeable metallic silver area and high-gloss black area masking plates, it completes the precise division of the two-color spraying boundary, completely solving the defects such as color separation skew and jaggedness caused by manual film application, and significantly improving the product appearance quality.
[0017] 2. This invention uses a fan to inflate the air ring, causing the arc-shaped sealing ring to expand outward. In conjunction with the one-way ventilation component inside the air pipe, the air ring is kept expanding continuously, achieving a seamless seal on the irregular curved surface of the lidar shell. This effectively blocks the penetration of paint atomization particles, eliminates color bleeding and paint overspray problems, and significantly reduces the product scrap rate.
[0018] 3. This invention achieves rapid locking and unlocking of the limiting frame through a locking component driven by a torsion bar, and completes rapid switching of the shielding plate with the assembly component composed of wedge grooves and locking blocks. Clamping can be completed without auxiliary tools, greatly shortening the single-piece operation cycle and adapting to the continuous batch production of the suspended conveyor line.
[0019] 4. This invention protects the inner surface of the front car body with a contoured cavity shell made of soft silicone material, and replaces manual film application with a glue-free physical masking method, thus achieving all-round protection for the workpiece substrate and paint surface, avoiding problems such as residual glue, paint peeling, etc., while eliminating differences in manual operation and ensuring the consistency of batch product quality. Attached Figure Description
[0020] Figure 1 This is a perspective view of the present invention; Figure 2 This is a rear view of the present invention; Figure 3 This is a half-sectional view of the front body of the present invention; Figure 4 This is a schematic diagram of the contour-following cavity shell structure of the present invention; Figure 5 This is a half-sectional view of the locking plate of the present invention; Figure 6 This is a half-sectional view of the rotating rod of the present invention; Figure 7 This is a schematic diagram of the fan structure of the present invention; Figure 8 This is a half-sectional view of the docking platform of the present invention; Figure 9 This is a half-sectional view of the locking block of the present invention; Figure 10 This is a half-sectional view of the assembly platform of the present invention; Figure 11 This is a half-sectional view of the trachea of the present invention; Figure 12 This is a half-sectional view of the fixing tube of the present invention; Figure 13 This is a half-sectional view of the sealing shell of the present invention; Figure 14 This is a half-sectional view of the gas ring of the present invention; Figure 15 This is a schematic diagram of the high-gloss black area shielding plate structure of the present invention; Figure 16 This is a half-sectional view of the cover plate of the present invention; Figure 17 This is a two-half cross-sectional view of the gas ring of the present invention.
[0021] The components are as follows: 1. Base frame; 2. Fixed frame; 3. Restriction frame; 4. Loading frame; 5. Locking plate; 6. Support frame; 7. Front body shell; 8. Connecting frame; 9. Docking platform; 10. Assembly platform; 11. Metallic silver area shielding plate; 12. High-gloss black area shielding plate; 13. Fan; 14. Torsion bar; 15. Workbench; 16. Rotating rod; 17. Contouring cavity shell; 18. LiDAR shell; 19. Adapter rod; 20. Locking rod; 21. Paddle; 22. Clamping tooth; 23. Air pipe; 24. Arc-shaped sealing ring one; 25. Air ring one; 26. Connecting block; 27. Locking block; 28. Fixed ring; 29. U-shaped frame; 30. Fixed tube; 31. Moving tube; 32. Lightweight spring; 33. Sealing shell; 34. Cover plate; 35. Arc-shaped sealing ring two; 36. Air ring two. Detailed Implementation
[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0023] Example 1: like Figure 1-4 As shown, this embodiment of the invention provides a special masking fixture for dual-color spraying of front lidar, including a base frame 1, a limiting frame 3, a docking platform 9, and an assembly platform 10: a fixing frame 2 is fixedly connected to the middle of the top of the base frame 1, casters are installed at the four corners of the bottom of the base frame 1, a fan 13 is fixedly connected to the front of the base frame 1, a loading frame 4 is fixedly connected to the top of the front of the base frame 1 corresponding to the top of the fan 13, a workbench 15 is fixedly connected to the bottom of the base frame 1, support frames 6 are fixedly connected to the left and right sides of the top of the workbench 15, a contoured cavity shell 17 is fixedly connected to the top of the support frame 6, a front car shell 7 is fitted on the upper side of the contoured cavity shell 17, and a lidar shell 18 is fixedly connected to the inner side of the front car shell 7; Specifically: The base frame 1 is made of welded metal square tubing, providing sufficient structural rigidity to support the weight of the entire tooling and workpiece. Four self-locking casters are installed at the bottom corners of the base frame 1, allowing for flexible movement to the corresponding workstation on the overhead conveyor line and temporary fixation. A rectangular fixing frame 2 is welded and fixed to the center of the top of the base frame 1, with a fan 13 bolted to the front end. A loading frame 4 is fixed above the fan 13 at the front of the base frame 1 for temporarily mounting spare high-gloss black area masking plates 12, facilitating quick switching between two-color spraying processes. A workbench 15 is fixedly installed at the center of the bottom of the base frame 1. Vertical support frames 6 are symmetrically welded to the left and right sides of the top of the workbench 15, and the top of the support frames 6 is fixedly connected to a contoured cavity shell 17 using countersunk screws. The contoured cavity shell 17 is integrally molded from soft silicone material. Its outer surface contour perfectly matches the inner shape of the front shell 7. When the front shell 7 is fitted onto the contoured cavity shell 17, it can achieve precise positioning without gaps, effectively preventing workpiece displacement or shaking during the spraying operation. At the same time, the soft material can avoid scratching the inner surface of the front shell 7. The inner side of the front shell 7 is pre-fixed to the lidar shell 18 with clips to ensure that the relative position of the two remains constant throughout the spraying process.
[0024] Example 2: like Figure 4-6 As shown, the outer wall of the rear end of the limiting frame 3 is rotatably connected to the top side of the base frame 1. Connecting frames 8 are fixedly connected to the left and right sides of the outer wall of the limiting frame 3. A rotating rod 16 is rotatably connected to the rear end of the limiting frame 3. A locking plate 5 is rotatably connected to the outer wall of the rotating rod 16. A torsion rod 14 is rotatably connected to the rear end of the locking plate 5. When the torsion rod 14 rotates, it is connected to the fixed frame 2 through the locking assembly. The locking assembly includes a paddle 21 slidably connected to the inner wall of the locking plate 5. A strong spring is provided inside the paddle 21. The other end of the strong spring inside the paddle 21 is fixedly connected to the inner wall of the locking plate 5. A locking rod 20 is rotatably connected to the inner wall of the bottom end of the locking plate 5 through a torsion spring. A locking tooth 22 is fixedly connected to the middle of the rotating rod 16. The rotating rod 16 and the torsion rod 14 are rotatably connected to a connecting rod 19. The rotation of the torsion rod 14 drives the rotating rod 16 to rotate synchronously through the connecting rod 19. The paddle 21 abuts against the inner side of the locking rod 20. The locking rod 20 covers the rear rod part of the fixed frame 2 to form a lock. Specifically: The outer wall of the rear end of the limiting frame 3 is rotatably connected to the top side of the base frame 1 via a pin, allowing it to flip upwards and close downwards around the pin. Connecting frames 8 are symmetrically welded and fixed to the left and right sides of the outer wall of the limiting frame 3 to support the docking platform 9 and subsequent shielding components. A rotating rod 16 is horizontally inserted and rotatably connected to the rear end of the limiting frame 3. A locking plate 5 is rotatably connected to the middle of the outer wall of the rotating rod 16. A torsion rod 14 is also rotatably connected to the rear end of the locking plate 5 via a pin. The rotating rod 16 and the torsion rod 14 are connected by a transmission rod 19. When the torsion rod 14 rotates, it can synchronously drive the rotating rod 16 to rotate via the adapter rod 19.
[0025] The locking plate 5 integrates a locking assembly, specifically including a paddle 21 slidably connected to the inner wall of the locking plate 5. A strong spring abuts against the inner side of the paddle 21, and the other end of the strong spring is fixedly connected to the inner wall of the locking plate 5. A locking rod 20 is rotatably connected to the inner wall of the bottom end of the locking plate 5 via a torsion spring. A locking tooth 22 is fixedly connected to the rotating rod 16 at the position corresponding to the paddle 21. Under the preload of the strong spring, the paddle 21 always abuts against the inner side of the locking rod 20, thus restricting the rotation of the locking rod 20 under normal conditions.
[0026] In actual use, the base frame 1 is first moved to the work location using the casters, and the front body 7 is fitted onto the contoured cavity shell 17 set at the workbench 15. The outer side of the contoured cavity shell 17 is soft and can fit tightly against the inner side of the front body 7, preventing scratches on the inner side of the front body 7. Then, the limiting frame 3 and the connecting frame 8 are rotated downwards to cover the outer side of the front body 7, so that the metallic silver area shielding plate 11 or the high-gloss black area shielding plate 12 connected to the assembly table 10 at the docking table 9 is initially attached to the corresponding position of the front body 7.
[0027] During this process, the locking plate 5 set at the limiting frame 3 is moved downward so that it is fitted onto the rear rod of the fixed frame 2. By raising the torsion bar 14, the torsion bar 14 drives the rotating rod 16 to rotate under the transmission action of the adapter rod 19, thereby causing the locking teeth 22 on the rotating rod 16 to push the paddle 21 to slide inward, compressing the strong spring and causing the paddle 21 to fall off the locking rod 20, thus releasing the restriction on the locking rod 20.
[0028] The worker continued to press down the locking plate 5. When the locking rod 20 contacted the rod of the fixed frame 2, it was squeezed and bent, and the torsion spring 1 was compressed. After the locking plate 5 was fully fitted onto the fixed frame 2, the locking rod 20 quickly returned to its original position under the elastic force of the torsion spring 1, and locked onto the rear rod of the fixed frame 2. Then the torsion rod 14 was released, and the lever 21 slid outward under the rebound of the strong spring, and locked onto the inside of the locking rod 20 again, completing the locking. This allowed the limiting frame 3 to be stably fitted onto the fixed frame 2, and the limiting frame 3, together with the connecting frame 8, to firmly cover the outside of the front body 7, providing a stable masking base for subsequent painting operations.
[0029] Example 3: like Figure 8 and 9As shown, the outer wall of the docking platform 9 is mounted on the outer wall of the connecting frame 8 rod. The docking platform 9 and the assembly platform 10 are connected by an assembly component. The outer wall of the assembly platform 10 is respectively equipped with a metallic silver area shielding plate 11 and a high-gloss black area shielding plate 12. The outer wall of the high-gloss black area shielding plate 12 is hung on the outside of the loading frame 4. The assembly component includes a wedge-shaped groove located on the inner side of the docking platform 9 that fits with the upper layer of the assembly platform 10. The top of the assembly platform 10 can fit into the inner side of the docking platform 9. A connecting block 26 is fixedly connected to the outer wall of the front end of the docking platform 9. A locking block 27 is rotatably connected to the inner side of the connecting block 26 through a torsion spring. A fixing ring 28 is rotatably connected to the inner wall of the locking block 27. A U-shaped frame 29 is fixedly connected to the front side of the assembly platform 10. The outer wall of the fixing ring 28 is fitted inside the U-shaped frame 29. Specifically: The docking platform 9 is bolted to the outer wall of the horizontal rod of the connecting frame 8, and its position precisely corresponds to the spraying area of the lidar housing 18 below. The docking platform 9 and the assembly platform 10 can be quickly assembled and disassembled through a special assembly component. The outer wall of the assembly platform 10 is pre-loaded with a metallic silver area masking plate 11 and a high-gloss black area masking plate 12 respectively by countersunk screws. The unused high-gloss black area masking plate 12 can be temporarily hung on the outside of the loading frame 4 at the front end of the base frame 1, which facilitates quick access and switching between two-color spraying processes.
[0030] The assembly component includes a wedge-shaped groove along the inner length of the docking platform 9. The cross-sectional shape of the wedge-shaped groove perfectly matches the upper boss of the assembly platform 10, ensuring that the top of the assembly platform 10 can smoothly slide into the inner side of the docking platform 9 along the wedge-shaped groove, achieving dual positioning in both the lateral and vertical directions. A connecting block 26 is welded and fixed to the outer wall of the front end of the docking platform 9. An L-shaped locking block 27 is rotatably connected to the inner side of the connecting block 26 via a torsion spring. An annular fixing ring 28 is rotatably connected to the front end of the locking block 27 via a pin. A U-shaped frame 29 is welded and fixed to the corresponding position on the front side of the assembly platform 10. The inner diameter of the fixing ring 28 matches the rod diameter of the U-shaped frame 29.
[0031] When using the metallic silver area masking plate 11 or the high-gloss black area masking plate 12, first align the top of the assembly table 10 with the wedge-shaped groove inside the docking table 9, and smoothly slide it into place along the groove. Then, pry the locking block 27 outward to fit the annular fixing ring 28 onto the crossbar of the U-shaped frame 29. After releasing the locking block 27, it automatically resets under the rebound of the torsion spring 2, causing the fixing ring 28 to tighten and securely lock inside the U-shaped frame 29, completing the assembly and fixing of the corresponding masking plate. After assembly, the metallic silver area masking plate 11 can accurately mask the metallic silver sprayed area of the lidar housing 18, and the high-gloss black area masking plate 12 can accurately mask the high-gloss black sprayed area, providing a reliable masking foundation for dual-color zone spraying.
[0032] Example 4: like Figure 7-17As shown, air pipes 23 are fixedly connected to the output end of the fan 13 and the inner wall of the assembly table 10. Air pipes 23 at the workbench 15 penetrate the outer wall of the connecting frame 8 and extend to the inner wall of the docking platform 9. Air pipes 23 on the inner wall of the assembly table 10 penetrate the high-gloss black area shielding plate 12 and the metallic silver area shielding plate 11 respectively and are installed. Air rings 25 are fitted onto the bottom inner wall of the metallic silver area shielding plate 11. The output end of the air pipe 23 penetrating the metallic silver area shielding plate 11 at the assembly table 10 is fixedly connected to and passes through the air rings 25. Arc-shaped sealing rings 24 are fixedly connected to both sides of the outer wall of the rightmost air ring 25 on the bottom inner wall of the assembly table 10. The outer wall of the arc-shaped sealing rings 24 is tightly attached to the top side of the lidar housing 18, completing the shielding of the metallic silver sprayed area of the lidar housing 18. A cover plate 34 is fixedly connected to the bottom of the assembly table 12. An air ring 36 is fitted on the inner wall of the bottom of the cover plate 34. The output end of the air pipe 23 that passes through the high-gloss black area shielding plate 12 at the assembly table 10 is fixedly connected to the outer wall of the air ring 36. Arc-shaped sealing rings 35 are rotatably connected to both sides of the outer wall of the air ring 36. The outer wall of the arc-shaped sealing rings 35 is close to the outer side of the lidar housing 18, thus completing the shielding of the high-gloss black sprayed area of the lidar housing 18. A fixed pipe 30 is fixedly connected to the inner wall of the air pipe 23 at the output end of the fan 13. A sealing shell 33 is fixedly connected to the bottom of the inner wall of the fixed pipe 30. A light spring 32 is fitted on the outer wall of the sealing shell 33. A moving pipe 31 is fixedly connected to the other end of the light spring 32. The inner wall of the top of the moving pipe 31 is fitted onto the ball component at the top of the sealing shell 33.
[0033] Specifically: Oil-resistant and aging-resistant rubber air pipes 23 are fixedly connected to both the output end of the blower 13 and the inner wall of the assembly table 10. The air pipes 23 are fixed in sections by pipe clamps to ensure that the pipeline route is neat and has good air tightness. The air pipes 23 leading out from the workbench 15 pass through the outer wall of the connecting frame 8 and extend to the inner wall of the docking table 9. The air pipes 23 on the inner wall of the assembly table 10 pass through the reserved holes of the high-gloss black area shielding plate 12 and the metallic silver area shielding plate 11 respectively and are sealed to form a complete inflation channel.
[0034] Each of the inner walls of the bottom of the metallic silver area shielding plate 11 is fitted with an elastic rubber air ring 25. The output end of the air pipe 23 passing through the metallic silver area shielding plate 11 at the assembly table 10 is fixedly connected to the air ring 25 and communicates with its interior. Both sides of the outer wall of the air ring 25 on the far right of the bottom inner wall of the assembly table 10 are fixedly connected with silicone arc-shaped sealing rings 24. When the air ring 25 is inflated, it can drive the arc-shaped sealing rings 24 to expand outward evenly, so that its outer wall tightly adheres to the top edge of the lidar housing 18, achieving a complete seal and shielding of the metallic silver sprayed area.
[0035] A cover plate 34 is fixedly connected to the bottom end of the high-gloss black area shielding plate 12. An air ring 36 is fitted on the inner wall of the bottom end of the cover plate 34. The output end of the air pipe 23 that passes through the high-gloss black area shielding plate 12 at the assembly table 10 is fixedly connected to the outer wall of the air ring 36. Both sides of the outer wall of the air ring 36 are rotatably connected to arc-shaped sealing rings 35 via pins. When the air ring 36 is inflated, it pushes the arc-shaped sealing rings 35 to flip outward, so that its outer wall tightly adheres to the outer curved surface of the lidar housing 18, thus completing the sealing and shielding of the high-gloss black sprayed area.
[0036] One-way ventilation components are fixedly connected to the inner wall of the air pipe 23 at the output end of the blower 13. The components include a fixed pipe 30, and a sealing shell 33 with a spherical sealing head at the top is fixedly connected to the bottom of the inner wall of the fixed pipe 30. A light spring 32 is sleeved on the outer wall of the sealing shell 33. A movable pipe 31 is fixedly connected to the other end of the light spring 32. The inner wall of the top of the movable pipe 31 is sleeved on the spherical part of the sealing shell 33. During inflation, the gas pressure pushes the moving tube 31 downward, exposing the spherical sealing head at the top of the sealing shell 33, allowing the gas to smoothly pass through the fixed tube 30 into the downstream air pipe. When the workbench 15 stops inflating, the lightweight spring 32 uses its elasticity to reset the moving tube 31, causing the inner wall at the top of the moving tube 31 to re-abut against the spherical component of the sealing shell 33 to complete the seal. This prevents backflow of gas into the air pipe 23 at the assembly table 10, continuously maintaining the expansion state of the first air ring 25 or the second air ring 36, ensuring a tight seal between the arc-shaped sealing ring and the lidar housing 18, and effectively reducing quality problems such as color bleeding and overspray during the painting process.
[0037] Example 5: like Figure 1-17 As shown, a method for suspending and conveying paint using a special masking fixture for dual-color spray painting with a front lidar system includes the following steps: S1. Workpiece positioning: Move the base frame 1 to the corresponding work position of the suspended conveyor line via the casters, and put the front car body 7 on the outside of the contoured cavity shell 17 connected to the top support frame 6 of the worktable 15, so that the lidar shell 18 completes precise positioning with the front car body 7. S2, Fixture Locking: Rotate the limiting frame 3 to cover the outside of the front car body 7, and lock and fix it with the locking plate 5 and the locking assembly to ensure the stability of the connecting frame 8 and the docking platform 9. Raise the torsion bar 14, and drive the rotating bar 16 to rotate through the adapter bar 19, so that the pawl 22 moves the paddle 21 to disengage from the locking bar 20. Press down the locking plate 5 to fit it on the rod body of the fixed frame 2. The locking bar 20 is reset under the action of the torsion spring and covers the rear rod body of the fixed frame 2. After releasing the torsion bar 14, the paddle 21 engages the locking bar 20 under the action of the strong spring to complete the locking. S3. Preparation for the first color spraying: Connect the metallic silver area shielding plate 11 to the assembly assembly of the assembly table 10 and the docking table 9. Start the fan 13 to inflate the air ring 25 at the bottom of the metallic silver area shielding plate 11 through the air pipe 23, so that the arc-shaped sealing ring 24 is close to the edge of the metallic silver spraying area of the lidar housing 18, and the sealing is completed. When the fan 13 inflates the air pipe 23, the gas pushes the moving pipe 31 in the fixed pipe 30 downward, so that the ball component at the top of the sealing shell 33 is exposed, and the gas enters the corresponding air ring through the air pipe 23. S4. High-gloss black spraying: The tooling is sent to the high-gloss black spraying station by the overhead conveyor line to complete the spraying and curing of the 18 high-gloss black areas of the lidar shell. S5. Masking Switching: Turn off the fan 13 and release the gas in the first air ring 25. Remove the silver area masking plate 11 through the assembly components and replace it with the high-gloss black area masking plate 12. Restart the fan 13 to inflate the second air ring 36 at the bottom of the high-gloss black area masking plate 12, so that the arc-shaped sealing ring 35 is tightly attached to the edge of the high-gloss black sprayed area of the lidar housing 18, completing the sealing masking. When the fan 13 stops inflating, the lightweight spring 32 drives the moving tube 31 to reset and seal the sealing shell 33, maintaining the expansion state of the first air ring 25 or the second air ring 36. To maintain the sealed fit between the arc-shaped sealing ring 24 or the arc-shaped sealing ring 35 and the lidar housing 18, preventing color bleeding and paint overspray during the spraying process, the locking block 27 is pried to disengage the fixing ring 28 from the U-shaped frame 29. The assembly table 10 and the corresponding shielding plate are then removed by sliding along the wedge groove on the inner side of the docking platform 9. After replacement, the new assembly table 10 is embedded into the wedge groove. The locking block 27 is pried to fit the fixing ring 28 onto the U-shaped frame 29. After the locking block 27 is released, it is reset and fixed under the action of the torsion spring 2, realizing the rapid switching of the two-color spraying process. S6, Metallic Silver Spraying: The tooling is sent to the metallic silver spraying station by the overhead conveyor line to complete the spraying and curing of the metallic silver area of the lidar shell 18. S7. Demolding and Part Removal: Release the gas inside the second gas ring 36, unlock the locking component and rotate to open the limiting frame 3, and remove the painted front car body 7 and the lidar housing 18.
[0038] First, the entire base frame 1 is moved to the work location using casters. Then, the front car body 7 is fitted onto the contoured cavity shell 17 set at the workbench 15. The outer side of the contoured cavity shell 17 is soft, allowing it to fit snugly against the inner side of the front car body 7, thus preventing damage to the inner side of the front car body 7. Then, the limiting frame 3, together with the connecting frame 8, is rotated to cover the outer side of the front car body 7, so that the metallic silver area shielding plate 11 or the high-gloss black area shielding plate 12 connected to the assembly table 10 at the docking table 9 fits snugly against the front car body 7. During this process, the locking plate 5 set at the limiting frame 3 can be sleeved on the rod body of the fixed frame 2. By lifting the torsion rod 14, the torsion rod 14, under the action of the adapter rod 19, drives the rotating rod 16 to rotate, so that the locking tooth 22 of the rotating rod 16 moves the paddle 21 to disengage from the locking rod 20. After the locking rod 20 is released, the operator can press down the locking plate 5 so that the locking plate 5 cooperates with the locking rod 20 to be sleeved at the fixed frame 2. During this process, due to the restriction of the torsion spring, the locking rod 20 can be bent and then quickly reset. After releasing the torsion rod 14, the paddle 21 can be sleeved at the locking rod 20 again under the influence of the strong spring, completing the locking. This allows the limiting frame 3 to be stably sleeved at the fixed frame 2, and the limiting frame 3 together with the connecting frame 8 covers the outside of the front body 7. During the use of the metallic silver area masking plate 11 or the high-gloss black area masking plate 12, the wedge-shaped grooves provided on both allow the assembly table 10 to slide and fit inside the docking table 9. Then, the locking block 27 is pried open to fit the fixing ring 28 into the U-shaped frame 29, and the locking block 27 is released. The locking block 27 can be reset under the action of the torsion spring 2 and locked into the U-shaped frame 29 together with the fixing ring 28. After that, the assembly of the metallic silver area masking plate 11 or the high-gloss black area masking plate 12 is completed, allowing the metallic silver area masking plate 11 and the high-gloss black area masking plate 12 to respectively mask the metallic silver spraying area or the high-gloss black spraying area, thus completing the two-color spraying work. During the bonding and installation process, the workbench 15 is activated to inflate the air pipe 23. This causes the air pipe 23 at the assembly table 10 to expand the air ring 25 or the air ring 36. During the expansion of the air ring 25 or the air ring 36, the corresponding arc-shaped sealing ring 24 or the arc-shaped sealing ring 35 can be twisted outward, so that the arc-shaped sealing ring 24 or the arc-shaped sealing ring 35 can be better and more stably attached to the lidar housing 18, reducing damage such as color bleeding and paint overspray during the painting process. During inflation, a fixed tube 30 is installed inside the air pipe 23. The fixed tube 30 creates a one-way ventilation effect during the inflation of the air pipe 23. When the moving tube 31 is inflated, it can be pushed down, thereby exposing the sealing shell 33 and allowing gas to pass through the fixed tube 30 and be discharged from the air pipe 23. When the worktable 15 stops inflation, the light spring 32 can use its elasticity to make the upper part of the moving tube 31 abut against the spherical part of the sealing shell 33, completing the corresponding sealing and preventing the air pipe 23 at the assembly table 10 from backflowing gas. This maintains the expansion effect of the first air ring 25 or the second air ring 36, thereby achieving a tight seal.
[0039] Specifically: First, the workpiece is positioned. The base frame 1 is smoothly moved to the loading station of the overhead conveyor line using the universal wheels with self-locking function at the bottom. The front shell 7, pre-assembled with the lidar housing 18, is then fitted onto the outside of the contoured cavity shell 17 connected to the top support frame 6 of the worktable 15. The contoured cavity shell 17 is made of soft silicone material, which can fit tightly against the inside of the front shell 7, avoiding scratching the workpiece while ensuring positioning accuracy, so that the lidar housing 18 completes precise positioning with the front shell 7 according to a unified benchmark.
[0040] The tooling is then locked, and the limiting frame 3 is flipped upwards to completely cover the outside of the front body 7. The locking plate 5, in conjunction with the internal locking assembly, locks and secures the fixed frame 2. Specifically, the torsion bar 14 is raised, causing the rotating bar 16 to rotate synchronously via the adapter rod 19. This causes the locking teeth 22 on the rotating bar 16 to slide the lever 21 inwards and disengage from the locking bar 20, releasing the restriction on the locking bar 20. The locking plate 5 is then pressed down to fit onto the rear rod of the fixed frame 2. The locking bar 20, after being bent by the pressure, quickly returns to its original position under the action of the torsion spring, forming a lock around the rear rod of the fixed frame 2. The torsion bar 14 is released, and the lever 21, under the force of the spring, re-engages the locking bar 20, completing the final locking and ensuring the stable position of the connecting frame 8 and the docking platform 9 during subsequent conveying and painting processes.
[0041] Next, preparations for the first color coating are made. The assembly platform 10, pre-loaded with the metallic silver area shielding plate 11, is connected and fixed via the assembly components of the docking platform 9. The blower 13 is started, and air is pumped into the air ring 25 at the bottom of the metallic silver area shielding plate 11 through the air pipe 23. During inflation, the gas pressure pushes the moving pipe 31 inside the fixed pipe 30 downward to compress the lightweight spring 32, exposing the spherical component at the top of the sealing shell 33. The gas then smoothly enters the air ring 25 through the air pipe 23. The expansion of the air ring 25 causes the arc-shaped sealing ring 24 to expand outward evenly, tightly adhering to the edge of the metallic silver coating area of the lidar housing 18, completing the full sealing shielding.
[0042] After masking is completed, the entire tooling is mounted on the overhead conveyor line and sent to the high-gloss black spraying station. The automatic spraying of the high-gloss black area of the lidar housing is completed according to the preset process parameters. After the spraying is completed, it directly enters the matching curing channel for paint curing.
[0043] After curing, perform a masking switch. Turn off the fan 13 and release the gas in the air ring 25 through the exhaust valve on the air pipe 23, causing the arc-shaped sealing ring 24 to detach from the surface of the lidar housing 18. Pry open the locking block 27 at the front end of the docking platform 9 to disengage the fixing ring 28 from the U-shaped frame 29. Smoothly slide the assembly platform 10 and the metallic silver area masking plate 11 along the wedge groove on the inner side of the docking platform 9. Remove the spare high-gloss black area masking plate 12 from the loading frame 4 at the front end of the base frame 1, insert the corresponding assembly platform 10 into the wedge groove of the docking platform 9, pry open the locking block 27 to fit the fixing ring 28 onto the U-shaped frame 29, and after releasing the locking block 27, it will automatically reset under the action of the torsion spring 2 to complete the fixation.
[0044] The blower 13 is restarted to inflate the second air ring 36 at the bottom of the high-gloss black area shielding plate 12. The expansion of the second air ring 36 pushes the second arc-shaped sealing ring 35 outward to tightly adhere to the edge of the high-gloss black spraying area of the lidar housing 18. When the blower 13 stops inflating, the lightweight spring 32 drives the moving tube 31 to return to its original position, so that the inner wall of the top of the moving tube 31 abuts against the spherical component of the sealing shell 33 to complete the seal, preventing gas backflow in the air pipe 23, and maintaining the expansion state of the second air ring 36 to maintain the sealed fit between the second arc-shaped sealing ring 35 and the lidar housing 18, effectively preventing color bleeding and overspray during subsequent spraying.
[0045] After the masking switch is completed, the tooling is sent to the metallic silver spraying station by the overhead conveyor line to complete the spraying and curing of the metallic silver area 18 of the lidar shell.
[0046] Finally, the mold is removed and the parts are taken out. The gas in the second gas ring 36 is released, the torsion bar 14 is raised to unlock the locking component, the limit frame 3 is rotated upward to open, and the painted front car body 7 and the lidar housing 18 are removed from the contour cavity shell 17 to complete the entire two-color painting process.
[0047] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A special masking fixture for dual-color spray painting of a front lidar, comprising a base frame (1), a limiting frame (3), a docking platform (9), and an assembly platform (10), characterized in that: A fixed frame (2) is fixedly connected to the top center of the base frame (1). Universal wheels are installed at the four corners of the bottom of the base frame (1). A fan (13) is fixedly connected to the front end of the base frame (1). A loading frame (4) is fixedly connected to the top of the front end of the base frame (1) corresponding to the top of the fan (13). A workbench (15) is fixedly connected to the bottom of the base frame (1). Support frames (6) are fixedly connected to the left and right sides of the top of the workbench (15). A contoured cavity shell (17) is fixedly connected to the top of the support frame (6). A front car shell (7) is fitted on the upper side of the contoured cavity shell (17). A laser radar shell (18) is fixedly connected to the inner side of the front car shell (7). The outer wall of the rear end of the limiting frame (3) is rotatably connected to the top side of the base frame (1). Connecting frames (8) are fixedly connected to the left and right sides of the outer wall of the limiting frame (3). A rotating rod (16) is rotatably connected to the rear end of the limiting frame (3). A locking plate (5) is rotatably connected to the outer wall of the rotating rod (16). A torsion rod (14) is rotatably connected to the rear end of the locking plate (5). When the torsion rod (14) rotates, it is connected to the fixed frame (2) through the locking component. The outer wall of the docking platform (9) is mounted on the outer wall of the connecting frame (8) rod. The docking platform (9) and the assembly platform (10) are connected by an assembly component. The outer wall of the assembly platform (10) is respectively loaded with a metal silver area shielding plate (11) and a high-gloss black area shielding plate (12). The outer wall of the high-gloss black area shielding plate (12) is hung on the outside of the loading frame (4).
2. The special masking fixture for dual-color spray painting of a front lidar as described in claim 1, characterized in that: The locking assembly includes a paddle (21) slidably connected to the inner wall of the locking plate (5). A strong spring is provided inside the paddle (21). The other end of the strong spring inside the paddle (21) is fixedly connected to the inner wall of the locking plate (5). A locking rod (20) is rotatably connected to the inner wall of the bottom end of the locking plate (5) through a torsion spring. A locking tooth (22) is fixedly connected to the middle of the rotating rod (16). The rotating rod (16) and the torsion rod (14) are rotatably connected to a connecting rod (19). The rotation of the torsion rod (14) drives the rotating rod (16) to rotate synchronously through the connecting rod (19). The paddle (21) abuts against the inner side of the locking rod (20). The locking rod (20) covers the rear rod part of the fixed frame (2) to form a lock.
3. The special masking fixture for dual-color spray painting of a front lidar as described in claim 1, characterized in that: The assembly components include wedge-shaped grooves located on the inner side of the docking platform (9) that fit with the upper layer of the assembly platform (10). The top of the assembly platform (10) can fit into the inner side of the docking platform (9). A connecting block (26) is fixedly connected to the outer wall of the front end of the docking platform (9). A locking block (27) is rotatably connected to the inner side of the connecting block (26) through a torsion spring. A fixing ring (28) is rotatably connected to the inner wall of the locking block (27). A U-shaped frame (29) is fixedly connected to the front side of the assembly platform (10). The outer wall of the fixing ring (28) is fitted inside the U-shaped frame (29).
4. The special masking fixture for dual-color spray painting of a front lidar as described in claim 1, characterized in that: The output end of the fan (13) and the inner wall of the assembly table (10) are both fixedly connected with air pipes (23). The air pipe (23) at the workbench (15) passes through the outer wall of the connecting frame (8) and extends to the inner wall of the docking table (9). The air pipe (23) on the inner wall of the assembly table (10) passes through the high-gloss black area shielding plate (12) and the metallic silver area shielding plate (11) respectively and is installed.
5. The special masking fixture for dual-color spray painting of a front lidar as described in claim 1, characterized in that: The inner wall of the bottom end of the metal silver area shielding plate (11) is fitted with an air ring (25). The output end of the air pipe (23) that passes through the metal silver area shielding plate (11) at the assembly platform (10) is fixedly connected to the air ring (25) and passes through it. The outer walls of the rightmost air ring (25) at the bottom end of the assembly platform (10) are fixedly connected with arc-shaped sealing rings (24). The outer wall of the arc-shaped sealing ring (24) is close to the top side of the lidar housing (18) to complete the shielding of the metal silver sprayed area of the lidar housing (18).
6. The special masking fixture for dual-color spray painting of a front lidar as described in claim 1, characterized in that: The bottom end of the high-gloss black area shielding plate (12) is fixedly connected to a cover plate (34). The inner wall of the bottom end of the cover plate (34) is fitted with an air ring II (36). The output end of the air pipe (23) that passes through the high-gloss black area shielding plate (12) at the assembly table (10) is fixedly connected to the outer wall of the air ring II (36). Both sides of the outer wall of the air ring II (36) are rotatably connected to an arc-shaped sealing ring II (35). The outer wall of the arc-shaped sealing ring II (35) is close to the outer side of the lidar housing (18), thus completing the shielding of the high-gloss black sprayed area of the lidar housing (18).
7. The special masking fixture for dual-color spray painting of a front lidar as described in claim 1, characterized in that: The inner wall of the air pipe (23) at the output end of the fan (13) is fixedly connected to a fixed pipe (30), and the bottom of the inner wall of the fixed pipe (30) is fixedly connected to a sealing shell (33). The outer wall of the sealing shell (33) is fitted with a light spring (32), and the other end of the light spring (32) is fixedly connected to a moving pipe (31). The inner wall of the top end of the moving pipe (31) is fitted onto the ball component at the top end of the sealing shell (33).
8. A method for suspending and conveying a front lidar dual-color painting spraying fixture using a masking tooling as described in any one of claims 1 to 7, characterized in that, Includes the following steps: S1. Workpiece positioning: Move the base frame (1) to the corresponding work position of the suspended conveyor line through the casters, and put the front car shell (7) on the outside of the contoured cavity shell (17) connected to the top support frame (6) of the worktable (15), so that the lidar shell (18) completes precise positioning with the front car shell (7). S2, Tooling Locking: Rotate the limiting frame (3) to cover the outside of the front body (7), and use the locking plate (5) to lock and fix the locking components and the fixing frame (2) to ensure the stability of the connecting frame (8) and the docking platform (9); S3, First color spraying preparation: Connect the metal silver area shielding plate (11) to the assembly assembly of the assembly table (10) and the docking table (9) through the assembly components. Start the fan (13) to inflate the air ring (25) at the bottom of the metal silver area shielding plate (11) through the air pipe (23) so that the arc sealing ring (24) is close to the edge of the metal silver spraying area of the lidar shell (18) to complete the sealing and shielding. S4, High-gloss black spraying: The tooling is sent to the high-gloss black spraying station by the overhead conveyor line to complete the spraying and curing of the high-gloss black area of the lidar shell (18); S5, Masking Switch: Turn off the fan (13) and release the gas in the first air ring (25). Remove the silver metal area masking plate (11) through the assembly assembly and replace it with the high-gloss black area masking plate (12). Start the fan (13) again to inflate the second air ring (36) at the bottom of the high-gloss black area masking plate (12) so that the second arc sealing ring (35) is close to the edge of the high-gloss black sprayed area of the lidar housing (18) to complete the sealing and masking. S6, Metallic Silver Spraying: The tooling is sent to the metallic silver spraying station along the overhead conveyor line to complete the spraying and curing of the metallic silver area of the lidar shell (18). S7. Demolding and removing parts: Release the gas in the second gas ring (36), unlock the locking component and rotate to open the limit frame (3), and remove the painted front car body (7) and the lidar housing (18).
9. The method for suspending and conveying painting using a special masking fixture for dual-color spray painting with front lidar as described in claim 8, characterized in that: In steps S3 and S5, when the blower (13) fills the air pipe (23) with air, the gas pushes the movable pipe (31) inside the fixed pipe (30) downward, exposing the ball component at the top of the sealing shell (33), and the gas enters the corresponding air ring through the air pipe (23); When the blower (13) stops inflating, the lightweight spring (32) drives the moving tube (31) to reset and seal the sealing shell (33), maintaining the expansion state of the first air ring (25) or the second air ring (36), maintaining the sealing fit between the first arc sealing ring (24) or the second arc sealing ring (35) and the lidar shell (18), preventing color bleeding and paint overspray during the spraying process.
10. A method for suspending and conveying painting using a special masking fixture for dual-color spray painting with front lidar as described in claim 8, characterized in that: The operation process of the locking component in step S2 is as follows: lift the torsion bar (14), drive the rotating bar (16) to rotate through the adapter bar (19), so that the locking tooth (22) moves the paddle (21) to disengage from the locking bar (20), press down the locking plate (5) to make it fit on the rod body of the fixed frame (2), the locking bar (20) is reset under the action of the torsion spring and covers the rear rod body of the fixed frame (2), after the torsion bar (14) is released, the paddle (21) engages with the locking bar (20) under the action of the strong spring to complete the locking; When switching the masking plate in step S5, the locking block (27) is pried open to disengage the fixing ring (28) from the U-shaped frame (29). The assembly table (10) and the corresponding masking plate are removed by sliding along the wedge groove on the inner side of the docking platform (9). After replacement, the new assembly table (10) is embedded into the wedge groove. The locking block (27) is pried open to fit the fixing ring (28) onto the U-shaped frame (29). After the locking block (27) is released, it is reset and fixed under the action of the second torsion spring, thus realizing the rapid switching of the two-color spraying process.