Workpiece surface treatment control method and system based on plastic injection line

Abstract

This invention discloses a workpiece surface treatment control method and system based on a powder coating production line, including a workpiece conveyor belt, a powder coating machine, a curing oven, and a central processor. The powder coating machine and curing oven are both installed on top of the workpiece conveyor belt. This invention deeply integrates the workpiece conveyor belt, image acquisition, pre-treatment spraying, powder coating machine, and curing oven through the central processor, achieving fully automated operation without human intervention from workpiece identification to final curing, greatly improving production efficiency and stability. The system, through rapid identification by the main image acquisition device and comparison by the storage module, can determine the workpiece type and retrieve corresponding process parameters. Combined with the dynamic combination of a drive motor rotating an arc-shaped guide rail and a micro-motor driving the sliding scan of the secondary image acquisition device, it flexibly adapts to workpieces of different sizes and complex curved surfaces, enabling mixed-line production and rapid changeover.

Description

Technical Field

[0001] This invention relates to the field of powder coating technology, and more specifically, to a method and system for controlling workpiece surface treatment based on a powder coating production line. Background Technology

[0002] Currently, in the field of metal workpiece surface treatment, especially in powder coating (electrostatic powder spraying) process, the quality of the pretreatment process is a key prerequisite for determining the adhesion, corrosion resistance and appearance of the final coating.

[0003] Traditional automated powder coating production lines typically use fixed spraying, immersion, or spray gun stations for pretreatment of workpieces (such as degreasing and phosphating). While this method is adequate for standardized, high-volume, and regularly shaped workpieces, its inherent drawbacks are becoming increasingly apparent. First, traditional methods lack intelligent recognition and adaptive capabilities. Faced with the growing demand for flexible production with diverse varieties and small batches, when the production line switches to workpieces of different shapes or sizes, manual intervention is often required to adjust the nozzle angle and distance or change fixtures. This results in low production efficiency, long preparation times, and an inability to achieve truly flexible mixed-line production. Second, the uniformity of the pretreatment liquid coating is difficult to guarantee. For workpieces with complex curved surfaces, deep cavities, or uneven structures, fixed-position nozzles are prone to creating blind spots or liquid accumulation, leading to uneven pretreatment film layers and subsequent quality defects such as exposed substrate, pinholes, or uneven adhesion during powder coating. Furthermore, existing technologies lack a data closed loop based on the real-time status of the workpiece between pretreatment and subsequent powder coating processes. The pretreatment effect usually relies on empirical parameters and post-processing sampling, making it impossible to accurately determine the quality of each workpiece online and use the data feedback to adjust the powder coating parameters in real time. This keeps the entire process in an "open loop" state, which restricts the overall improvement and stability of coating quality. Therefore, professionals in this field have provided a workpiece surface treatment control method and system based on powder coating production lines to solve the above-mentioned problems. Summary of the Invention

[0004] To address the problems existing in the prior art, the present invention aims to provide a workpiece surface treatment control method and system based on a powder coating production line, which solves the problems of traditional powder coating production lines lacking intelligent recognition and adaptive capabilities when facing flexible production of multiple varieties and small batches, insufficient uniformity of pretreatment liquid spraying on complex curved workpieces, and lack of data closed loop between pretreatment and subsequent powder coating processes.

[0005] To achieve the above objectives, the present invention adopts the following technical solution;

[0006] A workpiece surface treatment system based on a powder coating production line includes a workpiece conveyor belt, a powder coating machine, a curing oven, and a main processor. The powder coating machine and curing oven are both installed on top of the workpiece conveyor belt. All three are connected to the main processor via signal transmission. A pre-treatment frame is fixedly installed on the top of the workpiece conveyor belt. A main image acquisition device is fixedly installed on the inner wall of the pre-treatment frame. A liquid storage tank and a liquid extraction pump are fixedly installed on the top of the pre-treatment frame, and the liquid extraction pump is internally connected to the liquid storage tank. A hollow shaft is rotatably connected to the inner top wall of the pre-treatment frame. The liquid extraction pump is internally connected to the hollow shaft via a pipe. An arc-shaped guide rail is fixedly installed at the bottom of the hollow shaft. An external gear ring is fixedly installed on the outer side of the hollow shaft. A drive motor is fixedly installed on the inner wall of the pre-treatment frame. The output shaft of the drive motor is connected to the external gear ring via a bevel gear. Uniformly distributed flow nozzles are fixedly installed on the inner side of the arc-shaped guide rail.

[0007] The input signal of the main processor is connected to a storage module. The flow nozzle, main image acquisition device, drive motor and liquid pump are all connected to the main processor. The main image acquisition device is used to acquire workpiece shape image data and transmit it to the main processor. The main processor compares the data stored in the storage module with the acquired shape image data to determine the workpiece type and thus control the operating parameters of the subsequent flow nozzle, powder coating machine and curing oven.

[0008] As a further description of the above technical solution: the outer side of the arc-shaped guide rail is fixedly connected with evenly distributed transmission teeth, the outer side of the arc-shaped guide rail is slidably mounted with a support frame, the back of the support frame is fixedly mounted with a micro motor, the output shaft of the micro motor passes through the support frame and meshes with the transmission teeth through gears, the front and back of the support frame are fixedly connected with mounting plates, the bottom of the mounting plate is fixedly mounted with a secondary image acquisition device, and both the secondary image acquisition device and the micro motor are signal connected to the main processor.

[0009] As a further description of the above technical solution: a liquid level sensor is installed inside the liquid storage tank, and the liquid level sensor is signal-connected to the main processor to obtain the liquid level value inside the liquid storage tank and transmit it to the main processor.

[0010] As a further description of the above technical solution: a buzzer is fixedly installed on the top of the preprocessing frame, and the buzzer is connected to the main processor via signal.

[0011] As a further description of the above technical solution: the liquid pump is used to make the pipe connected to the hollow shaft slide and seal with the hollow shaft.

[0012] A workpiece surface treatment control method based on a powder coating production line includes the following steps:

[0013] S1. After the system is powered on, the main processor starts and completes the self-test and initialization of all connected devices. Then the workpiece conveyor belt starts running, smoothly transporting the workpiece to be processed to the identification station inside the preprocessing frame.

[0014] Meanwhile, the liquid level sensor in the storage tank continuously monitors the amount of pretreatment liquid and feeds the real-time data back to the main processor. If the liquid level is lower than the preset safety threshold, the main processor will immediately drive the buzzer to issue an audible and visual alarm to remind the operator to replenish the liquid in time and ensure that the material supply of the pretreatment process is uninterrupted.

[0015] S2. When the workpiece arrives at the preset recognition position within the preprocessing frame, the workpiece conveyor belt pauses to ensure the workpiece remains stationary; the main processor then instructs the main image acquisition device fixed on the inner wall of the preprocessing frame to quickly capture images of the workpiece from all directions and obtain its overall shape contour data.

[0016] These data are transmitted to the main processor in real time, which immediately calls the pre-stored 3D models and feature databases of various standard workpieces in the storage module for high-speed comparison and intelligent recognition, thereby accurately determining the specific type of the current workpiece and generating an initial 3D digital model containing basic dimensions and contour information, laying the decision-making foundation for all subsequent customized processing.

[0017] S3. After successfully identifying the workpiece type, the main processor sends a coordinated command to the drive motor and the pump based on the preset process parameters of the workpiece type. The drive motor drives the external gear ring through the bevel gear set, which drives the hollow shaft and the entire arc-shaped guide rail structure fixed at its bottom to rotate, thereby adjusting the overall orientation of the multiple flow nozzles evenly distributed on the inner side of the arc-shaped guide rail, so that they are aligned with the key surface of the workpiece that needs to be pretreated.

[0018] At the same time, the liquid pump starts, pumping the pretreatment liquid in the storage tank into the hollow shaft through the pipeline, and then delivering it to each flow nozzle that has been rotated into position. The main processor precisely controls the opening sequence, flow rate and rotation angle of each flow nozzle according to the workpiece model, so that the pretreatment liquid can be evenly sprayed onto the workpiece surface at the most suitable angle and coverage, thus preparing for high-quality powder coating.

[0019] S4. After the pretreatment liquid is sprayed, the system enters the fine inspection stage. The main processor controls the micro motor to start. The output gear of the micro motor meshes with the transmission teeth on the outside of the arc-shaped guide rail, driving the support frame to slide smoothly along the trajectory of the arc-shaped guide rail. The secondary image acquisition device fixed to the bottom of the front and rear mounting plates of the support frame moves accordingly, performing high-resolution close-range scanning of the workpiece surface from multiple dynamic angles to capture finer geometric features of the workpiece surface, uniformity of pretreatment liquid coverage, and any possible minor defects.

[0020] These high-precision image data are transmitted back to the main processor in real time and fused with the initial model generated in the second step to construct a detailed, data-enhanced three-dimensional digital twin model of the workpiece surface. This model will serve as the absolute basis for setting the final powder coating parameters.

[0021] S5. Based on the complete workpiece information obtained in the first four steps, the workpiece is then conveyed to the bottom of the powder coating machine by the workpiece conveyor belt. The main processor sends out the parameter set to accurately control the key parameters of the powder coating machine, such as the spray gun movement trajectory, electrostatic voltage, and powder output, to ensure that the powder can be evenly and efficiently adsorbed on every complex contour surface of the workpiece according to the enhanced digital model.

[0022] After powder coating is completed, the workpiece is fed into the curing oven. The main processor dynamically adjusts the temperature of each zone of the curing oven and the speed of the workpiece according to the type of workpiece and the characteristics of the coating to achieve the best leveling and complete curing of the coating, ensuring its mechanical properties and weather resistance.

[0023] Compared with the prior art, the advantages of this invention are:

[0024] 1. In this invention, the workpiece conveyor belt, image acquisition, pre-processing spraying, powder coating machine and curing oven are deeply integrated through the main processor, realizing fully automated operation without human intervention from workpiece identification to final curing, which greatly improves production efficiency and stability; the system can determine the workpiece type and retrieve the corresponding process parameters by comparing the rapid identification of the main image acquisition device and the storage module. Combined with the dynamic combination of the drive motor driving the arc guide rail to rotate and the micro motor driving the secondary image acquisition device to slide and scan, it can flexibly adapt to workpieces of different sizes and complex curved surfaces, realizing mixed-line production and rapid changeover;

[0025] 2. In the pretreatment stage, the pretreatment liquid is sprayed in a directional and uniform manner through a rotatable flow nozzle, laying a solid foundation for high-quality powder coating. Meanwhile, the fine scanning of the secondary image acquisition equipment constructs an enhanced digital model of the workpiece, so that the parameter settings of the powder coating machine and curing oven are no longer fixed values, but dynamic optimal solutions based on the real-time three-dimensional model. This ensures that every workpiece, especially complex irregular parts, can obtain a coating with uniform thickness and excellent performance, significantly reducing rework rate and material waste. Attached Figure Description

[0026] Figure 1 This is a top view of the structure of the present invention;

[0027] Figure 2 This is a schematic cross-sectional view of the preprocessing framework of the present invention.

[0028] Figure 3 This is a front view cross-sectional structural diagram of the arc-shaped guide rail of the present invention;

[0029] Figure 4 This is a schematic diagram of the three-dimensional structure of the support frame of the present invention;

[0030] Figure 5 This is a schematic diagram illustrating the principle of the present invention.

[0031] Explanation of the labels in the diagram:

[0032] 1. Workpiece conveyor belt; 2. Powder coating machine; 3. Curing oven; 4. Main processor; 5. Pre-processing frame; 6. Main image acquisition device; 7. Liquid storage tank; 8. Liquid pump; 9. Hollow shaft; 10. Arc-shaped guide rail; 11. External gear ring; 12. Drive motor; 13. Flow nozzle; 14. Storage module; 15. Transmission gears; 16. Bearing frame; 17. Micro motor; 18. Mounting plate; 19. Secondary image acquisition device; 20. Liquid level sensor; 21. Buzzer. Detailed Implementation

[0033] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0034] In a powder coating production line, before powder coating and curing the workpiece, in order to improve the powder coating effect, reduce manual operation steps, and achieve automatic parameter adjustment, this solution provides Example 1:

[0035] Please see Figures 1-5 In this invention, a workpiece surface treatment system based on a powder coating production line includes a workpiece conveyor belt 1, a powder coating machine 2, a curing oven 3, and a main processor 4. The powder coating machine 2 and the curing oven 3 are both installed on top of the workpiece conveyor belt 1. The powder coating machine 2, the curing oven 3, and the workpiece conveyor belt 1 are all signal-connected to the main processor 4. A pre-treatment frame 5 is fixedly installed on the top of the workpiece conveyor belt 1. A main image acquisition device 6 is fixedly installed on the inner wall of the pre-treatment frame 5. A liquid storage tank is fixedly installed on the top of the pre-treatment frame 5. 7 is connected to the liquid pump 8, which is internally connected to the liquid storage tank 7. A hollow shaft 9 is rotatably connected to the inner top wall of the pretreatment frame 5. The liquid pump 8 is internally connected to the hollow shaft 9 through a pipe. An arc-shaped guide rail 10 is fixedly installed at the bottom end of the hollow shaft 9. An external gear ring 11 is fixedly installed on the outer side of the hollow shaft 9. A drive motor 12 is fixedly installed on the inner wall of the pretreatment frame 5. The output shaft of the drive motor 12 is connected to the external gear ring 11 through a bevel gear. A uniformly distributed flow nozzle 13 is fixedly installed on the inner side of the arc-shaped guide rail 10.

[0036] The input signal of the main processor 4 is connected to the storage module 14. The flow nozzle 13, the main image acquisition device 6, the drive motor 12, and the liquid pump 8 are all connected to the main processor 4. The main image acquisition device 6 is used to acquire workpiece shape image data and transmit it to the main processor 4. The main processor 4 compares the data stored in the storage module 14 with the acquired shape image data to determine the workpiece type and thus control the operating parameters of the subsequent flow nozzle 13, powder coating machine 2, and curing oven 3. A buzzer 21 is fixedly installed on the top of the pretreatment frame 5 and is connected to the main processor 4. The liquid pump 8 is used to make the pipe connected to the hollow shaft 9 slidingly sealed with the hollow shaft 9.

[0037] In this invention, after the system is powered on, the main processor 4 starts up and completes the self-test and initialization of all connected devices. Then the workpiece conveyor belt 1 starts running and smoothly transports the workpiece to be processed to the identification station inside the preprocessing frame 5.

[0038] When the workpiece arrives at the preset recognition position within the preprocessing frame 5, the workpiece conveyor belt 1 pauses to ensure the workpiece remains stationary. The main processor 4 then instructs the main image acquisition device 6, fixed on the inner wall of the preprocessing frame 5, to quickly capture images of the workpiece from all directions and obtain its overall shape contour data. This data is transmitted to the main processor 4 in real time, which immediately calls the various standard workpiece 3D models and feature databases pre-stored in the storage module 14 for high-speed comparison and intelligent recognition, thereby accurately determining the specific type of the current workpiece and generating an initial 3D digital model containing basic dimensions and contour information, laying the decision-making foundation for all subsequent customized processing.

[0039] After successfully identifying the workpiece type, the main processor 4 sends a coordinated command to the drive motor 12 and the liquid pump 8 based on the preset process parameters of the workpiece type. The drive motor 12 drives the external gear ring 11 through the bevel gear set, which drives the hollow shaft 9 and the entire arc-shaped guide rail 10 structure fixed at its bottom to rotate, thereby adjusting the overall orientation of the multiple flow nozzles 13 evenly distributed on the inner side of the arc-shaped guide rail 10 so that they are aligned with the key surface of the workpiece that needs to be pretreated.

[0040] At the same time, the liquid pump 8 starts, pumping the pretreatment liquid in the storage tank 7 into the hollow shaft 9 through the pipeline, and then delivering it to each flow nozzle 13 that has been rotated into position. The main processor 4 precisely controls the opening sequence, flow rate and rotation angle of each flow nozzle 13 according to the workpiece model, so that the pretreatment liquid can be evenly sprayed onto the workpiece surface at the most suitable angle and coverage, thus preparing for high-quality powder coating.

[0041] Subsequently, the workpiece is conveyed by the workpiece conveyor belt 1 to the bottom of the powder coating machine 2. The main processor 4 sends out the parameter set to precisely control the key parameters of the powder coating machine 2, such as the spray gun movement trajectory, electrostatic voltage, and powder output, to ensure that the powder can be uniformly and efficiently adsorbed on every complex contour surface of the workpiece according to the enhanced digital model. After the powder coating is completed, the workpiece is sent to the curing oven 3. The main processor 4 also dynamically adjusts the temperature of each temperature zone of the curing oven 3 and the speed of the workpiece passing through according to the type of workpiece and the characteristics of the coating to achieve the best leveling and complete curing of the coating, ensuring its mechanical properties and weather resistance.

[0042] Please see Figure 2 and 5 The liquid level sensor 20 is installed inside the liquid storage tank 7. The liquid level sensor 20 is connected to the main processor 4 to obtain the liquid level value inside the liquid storage tank 7 and transmit it to the main processor 4.

[0043] In this invention, the liquid level sensor 20 can monitor the internal capacity of the liquid storage tank 7 and transmit it to the main processor 4. The liquid level sensor 20 continuously provides liquid level feedback of the liquid storage tank 7, forming a material replenishment early warning closed loop.

[0044] Based on the above embodiment one, in order to further improve the subsequent powder coating accuracy, this solution provides embodiment two:

[0045] Please see Figures 2-5 The arc-shaped guide rail 10 is fixedly connected to the outer side with evenly distributed transmission teeth 15. A support frame 16 is slidably installed on the outer side of the arc-shaped guide rail 10. A micro motor 17 is fixedly installed on the back of the support frame 16. The output shaft of the micro motor 17 passes through the support frame 16 and meshes with the transmission teeth 15 through gears. Mounting plates 18 are fixedly connected to both the front and back of the support frame 16. A secondary image acquisition device 19 is fixedly installed at the bottom of the mounting plate 18. Both the secondary image acquisition device 19 and the micro motor 17 are connected to the main processor 4 via signals.

[0046] In this invention, during the pretreatment process described above, after the pretreatment liquid is sprayed, the system enters the fine inspection stage. The main processor 4 controls the micro motor 17 to start, and the output gear of the micro motor 17 meshes with the transmission teeth 15 on the outer side of the arc-shaped guide rail 10, driving the support frame 16 to slide smoothly along the trajectory of the arc-shaped guide rail 10. The secondary image acquisition device 19, which is fixed to the bottom of the front and rear mounting plates 18 of the support frame 16, moves accordingly, performing high-resolution close-range scanning of the workpiece surface from multiple dynamic angles to capture finer geometric features of the workpiece surface, uniformity of pretreatment liquid coverage, and any possible minor defects.

[0047] These high-precision image data are transmitted back to the main processor 4 in real time and fused with the initial model generated in the second step to construct a detailed, data-enhanced three-dimensional digital twin model of the workpiece surface. This model will serve as the absolute basis for setting the final powder coating parameters.

[0048] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. A workpiece surface treatment system based on a powder coating production line, comprising a workpiece conveyor belt (1), a powder coating machine (2), a curing oven (3), and a main processor (4), wherein the powder coating machine (2) and the curing oven (3) are both installed on top of the workpiece conveyor belt (1), and the powder coating machine (2), the curing oven (3), and the workpiece conveyor belt (1) are all signal-connected to the main processor (4), characterized in that: A pre-processing frame (5) is fixedly installed on the top of the workpiece conveyor belt (1). A main image acquisition device (6) is fixedly installed on the inner wall of the pre-processing frame (5). A liquid storage tank (7) and a liquid pump (8) are fixedly installed on the top of the pre-processing frame (5). The liquid pump (8) is internally connected to the liquid storage tank (7). A hollow shaft (9) is rotatably connected to the inner top wall of the pre-processing frame (5). The liquid pump (8) is internally connected to the hollow shaft (9) through a pipe. An arc-shaped guide rail (10) is fixedly installed at the bottom end of the hollow shaft (9). An external gear ring (11) is fixedly installed on the outer side of the hollow shaft (9). A drive motor (12) is fixedly installed on the inner wall of the pre-processing frame (5). The output shaft of the drive motor (12) is connected to the external gear ring (11) through a bevel gear. A uniformly distributed flow nozzle (13) is fixedly installed on the inner side of the arc-shaped guide rail (10). The input terminal of the main processor (4) is connected to the storage module (14). The flow nozzle (13), the main image acquisition device (6), the drive motor (12) and the liquid pump (8) are all connected to the main processor (4). The main image acquisition device (6) is used to acquire workpiece shape image data and transmit it to the main processor (4). The main processor (4) compares the data stored in the storage module (14) with the acquired shape image data to determine the workpiece type and thus control the operating parameters of the subsequent flow nozzle (13), powder coating machine (2) and curing oven (3).

2. The workpiece surface treatment system based on a powder coating production line according to claim 1, characterized in that: The outer side of the arc-shaped guide rail (10) is fixedly connected with uniformly distributed transmission teeth (15). The outer side of the arc-shaped guide rail (10) is slidably mounted with a support frame (16). The back of the support frame (16) is fixedly mounted with a micro motor (17). The output shaft of the micro motor (17) passes through the support frame (16) and meshes with the transmission teeth (15) through gears. The front and back of the support frame (16) are both fixedly connected with mounting plates (18). The bottom of the mounting plate (18) is fixedly mounted with a secondary image acquisition device (19). The secondary image acquisition device (19) and the micro motor (17) are both signal connected to the main processor (4).

3. The workpiece surface treatment system based on a powder coating production line according to claim 1, characterized in that: The liquid level sensor (20) is installed inside the liquid storage tank (7). The liquid level sensor (20) is connected to the main processor (4) to obtain the liquid level value inside the liquid storage tank (7) and transmit it to the main processor (4).

4. The workpiece surface treatment system based on a powder coating production line according to claim 1, characterized in that: A buzzer (21) is fixedly installed on the top of the preprocessing frame (5), and the buzzer (21) is connected to the main processor (4) via signal.

5. The workpiece surface treatment system based on a powder coating production line according to claim 1, characterized in that: The pump (8) is used to make the pipe connected to the hollow shaft (9) slide and seal with the hollow shaft (9).

6. The workpiece surface treatment control method based on a powder coating production line according to claim 1, applicable to the workpiece surface treatment system based on a powder coating production line as described in any one of claims 1-5, includes the following steps: S1. After the system is powered on, the main processor (4) starts and completes the self-test and initialization of all connected devices. Then the workpiece conveyor belt (1) starts running and smoothly transports the workpiece to be processed to the identification station inside the pre-processing frame (5). At the same time, the liquid level sensor (20) in the storage tank (7) continuously monitors the amount of pretreatment liquid and feeds back the real-time data to the main processor (4). If the liquid level is lower than the preset safety threshold, the main processor (4) will immediately drive the buzzer (21) to issue an audible and visual alarm. S2. When the workpiece arrives at the preset identification position in the preprocessing frame (5), the workpiece conveyor belt (1) stops to ensure that the workpiece is stationary; the main processor (4) then instructs the main image acquisition device (6) fixed on the inner wall of the preprocessing frame (5) to quickly capture images of the workpiece from all directions and obtain its overall shape contour data. These data are transmitted to the main processor (4) in real time, which immediately calls the pre-stored three-dimensional models and feature databases of various standard workpieces in the storage module (14) for high-speed comparison and intelligent recognition, thereby accurately determining the specific type of the current workpiece and generating an initial three-dimensional digital model containing basic dimensions and contour information. S3. After successfully identifying the workpiece type, the main processor (4) sends a coordinated instruction to the drive motor (12) and the liquid pump (8) according to the preset process parameters of the workpiece type. The drive motor (12) drives the external gear ring (11) through the bevel gear set, which drives the hollow shaft (9) and the entire arc-shaped guide rail (10) structure fixed at its bottom to rotate, thereby adjusting the overall orientation of the multiple flow nozzles (13) evenly distributed on the inner side of the arc-shaped guide rail (10) so that they are aligned with the key surface of the workpiece that needs to be pretreated. At the same time, the liquid pump (8) starts, pumping the pretreatment liquid in the storage tank (7) into the hollow shaft (9) through the pipeline, and then transporting it through the hollow shaft (9) to each flow nozzle (13) that has been rotated into position. The main processor (4) precisely controls the opening sequence, flow rate and rotation angle of each flow nozzle (13) and the drive motor (12) according to the workpiece model, so that the pretreatment liquid can be evenly sprayed onto the workpiece surface at the most suitable angle and coverage. S4. After the pretreatment liquid is sprayed, the system enters the fine inspection stage. The main processor (4) controls the micro motor (17) to start. The output gear of the micro motor (17) meshes with the transmission teeth (15) on the outside of the arc guide rail (10), driving the support frame (16) to slide smoothly along the trajectory of the arc guide rail (10). The secondary image acquisition device (19) fixed at the bottom of the front and rear mounting plates (18) of the support frame (16) moves accordingly, performing high-resolution close-range scanning of the workpiece surface from multiple dynamic angles to capture finer geometric features of the workpiece surface, uniformity of pretreatment liquid coverage, and any possible minor defects. These high-precision image data are transmitted back to the main processor (4) in real time and fused with the initial model generated in the second step to construct a detailed and data-enhanced three-dimensional digital twin model of the workpiece surface. This model will serve as the absolute basis for setting the final powder coating parameters. S5. Based on the complete workpiece information obtained in the first four steps, the workpiece is then sent to the bottom of the powder coating machine equipment (2) by the workpiece conveyor belt (1). The main processor (4) sends out the parameter set to accurately control the key parameters of the powder coating machine equipment (2), such as the spray gun movement trajectory, electrostatic voltage, and powder output, to ensure that the powder can be evenly and efficiently adsorbed on every complex contour surface of the workpiece according to the enhanced digital model. After the powder coating is completed, the workpiece is sent to the curing oven (3). The main processor (4) dynamically adjusts the temperature of each temperature zone of the curing oven (3) and the speed of the workpiece passing through according to the type of workpiece and the characteristics of the coating, so as to achieve the best leveling and complete curing of the coating.

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