Detection mechanism and detection method for primer coating of automobile bumper
By setting up a primer coating inspection mechanism with six sets of vision cameras and light sources on the car bumper production line, combined with AI recognition technology, the problem of difficult detection of primer coating leakage has been solved, achieving efficient and low-cost automatic inspection results.
Patent Information
- Application Number
- CN202511645419.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-11
- Publication Date
- 2026-02-24
AI Technical Summary
Existing technologies are insufficient to effectively detect whether the primer coating of car bumpers has been missed, especially when it is covered by topcoat, which leads to defective products being leaked out. Furthermore, existing testing methods are costly or have a high false alarm rate.
Design a car bumper primer coating inspection mechanism, which uses six sets of vision cameras and light sources to photograph the workpiece surface from different angles, and combines AI recognition technology with a trained mathematical model to perform inspection, thereby realizing automatic identification and missed spraying detection of the primer coating.
It achieves a 100% detection rate for missed primer coatings, with a detection area exceeding 96%. The equipment investment is less than 8% of that of a robot recognition system, does not increase labor costs, and is unaffected by topcoat fog.
Smart Images
Figure CN121558736A_ABST
Abstract
Description
Technical Field
[0001] A testing mechanism and method for testing the primer coating of automotive bumpers are disclosed, which are used to monitor the coating effect of automotive bumper primer on automotive production lines. This invention relates to the field of design and manufacturing technology of automotive bumper coating quality testing equipment. Background Technology Painting is a core aspect of car bumper appearance. Matching the color to the overall vehicle style is a major highlight of the body decoration. Original factory painting ensures that the bumper color matches the body color, guaranteeing the visual integrity of the vehicle. Currently, most bumpers are made of plastic. For plastic bumper substrates, such as polypropylene, exposure to the outside makes them susceptible to corrosion from ultraviolet rays and chemicals. Therefore, painting can form a protective film, isolating the external environment and preventing material aging and cracking. At the same time, the primer layer can enhance the adhesion of the surface coating and improve the uniformity of subsequent coatings. Therefore, pretreatment for painting, especially in humid or dusty environments, can reduce the risk of corrosion and extend the service life of components. Moreover, painting is not only a means of beautification but also a key process to ensure the function of the bumper. After a car bumper enters the painting line, it needs to be coated with three layers of paint: primer, topcoat, and clear coat. Each layer plays an indispensable role. The primer is the base layer of the paint, and its core function is to improve the adhesion between the paint and the car bumper, ensuring that the coating is firm and does not peel off. The topcoat is the color layer of the paint, and its core function is to give the coating a rich and colorful appearance and to significantly enhance the coating's durability, preventing fading, cracking, and other signs of aging. The clear coat is the protective layer of the paint, forming a transparent and hard protective film on the surface, which not only looks beautiful but also effectively resists the impact of external objects such as stones.
[0002] Currently, automotive bumper painting production lines are mostly fully automated. If a coating gap occurs during spraying, it needs to be detected and addressed promptly to prevent defective products from being produced. Because topcoat is colored and clearcoat is transparent and glossy, gaps in topcoat and clearcoat are easily detected. However, primer, being the bottom layer, is completely covered by the colored topcoat, making gaps in primer difficult to detect.
[0003] To prevent workpieces from overflowing due to missed primer coating, an inspection system is typically installed at the rear of the primer spray booth to check the primer coating condition. Current methods for primer coating inspection mainly include manual inspection, flow meter monitoring, and automated robotic inspection. For manual inspection, a human verification team is set up at the rear of the primer spray booth to confirm the primer spraying quality and promptly detect any missed areas. Flow meters are installed on the paint piping to monitor the usage flow rate; when the total flow rate used by a single unit falls below a set lower limit, the system will report "flow rate lower limit abnormality," prompting the operator to confirm. Automated robotic inspection involves a robot installed at the rear of the primer spray booth to confirm the primer spraying quality and automatically detect any missed areas. Currently, these three inspection methods each have their advantages and disadvantages: Manual inspection requires no equipment investment and relies on manual testing, but it necessitates setting up a manual testing station and adding an operator, increasing labor costs; Flow detection determines the amount of paint used per unit and can issue an immediate alarm, but false alarms may occur if the flow meter's lower limit is too high, as it selects a compromise value. Therefore, when a car bumper has localized paint leakage, the flow meter may fail to detect it, leading to defective products being discharged; Robotic automatic inspection can perform a comprehensive inspection and confirmation of the workpiece, effectively detecting primer paint leakage, but this method requires two sets of explosion-proof robots, resulting in particularly high equipment investment costs. Summary of the Invention The purpose of this invention is to upgrade the production line based on existing equipment, and to set up a quality inspection section for primer spraying on the existing assembly line, which can solve the defects of the existing technology. A car bumper primer coating inspection mechanism and inspection method are designed. The aforementioned automotive bumper primer coating inspection mechanism includes a workpiece conveying structure, a spraying structure, a primer coating inspection device, and an analysis and identification device. The conveying structure is located at the front end of the production line and includes a continuous conveying device 1, a conveying trolley 2, a conveying control panel 3, and a workpiece to be sprayed 4. A pusher is provided on the conveying chain of the continuous conveying device 1, and the pusher is hung on the conveying trolley 2 carrying the workpiece to be sprayed 4. The spraying mechanism includes a primer spraying chamber 5, a primer spraying robot 6, a robot control panel 7, and a primer confirmation area 8. The primer spraying chamber 5 is set in an isolated space, and four primer spraying robots 6 are set in the isolated space. Preferably, the two ends of the isolation space are made of flexible sealing material, and the conveyor trolley 2 carrying the workpiece 4 to be sprayed passes through the middle under the push of the continuous conveying equipment 1; Preferably, the primer spraying robot 6 is set in groups of two, with two groups in total, and is symmetrically arranged on both sides of the isolation space. The middle of the isolation space is the channel of the continuous conveying equipment 1, and the continuous conveying equipment 1 pushes the conveying trolley 2 carrying the workpiece 4 to be sprayed. The primer coating detection device includes a primer pre-drying oven 9 and a primer coating detection area 10. The primer coating detection device is installed in the primer coating detection area 10. The primer coating detection device consists of six sets of visual detection devices, each set including a camera and a light source. Preferably, the primer coating detection area 10 is configured as an isolation frame space with openings at both ends. Within the frame space, there are six sets of visual inspection cameras and light sources: a first visual camera 11, a first light source 12, a second visual camera 13, a second light source 14, a third visual camera 15, a third light source 16, a fourth visual camera 17, a fourth light source 18, a fifth visual camera 19, a fifth light source 20, a sixth visual camera 21, and a sixth light source 22. Preferably, the six sets of visual inspection cameras and light sources, namely, visual camera 11, light source 12, visual camera 13, light source 14, visual camera 15, light source 16, visual camera 17, light source 18, visual camera 19, light source 20, visual camera 21, and light source 22, are respectively arranged on both sides of the upper part of the facade within the frame space, with three sets of visual inspection cameras and light sources arranged on each side (left, center, and right). Preferably, the conveying control panel 3 of the continuous conveying equipment 1 and the robot control panel 7 of the primer spraying robot 6 are located on the side of the continuous conveying equipment 1 where personnel operate. Preferably, the conveyor control panel 3 and the robot control panel 7 are connected to the controlled continuous conveyor 1 and the primer spraying robot 6 by cables; The analysis and identification mechanism includes a detection device server 23 and a detection device control cabinet 24. An AI recognition software system is installed in the detection device server 23. The detection device server 23 and the detection device control cabinet 24, as well as the analysis and identification mechanism, are connected by cables. A method for testing the primer coating of an automotive bumper includes the following steps: S1: The conveyor trolley 2 carries the workpiece 4 to be sprayed to the primer spraying chamber 5. The primer spraying robot 6 starts to spray the workpiece 4 under the control of the robot control panel 7. S2: After the spraying operation in step S1 is completed, the robot control panel 7 sends the number of the conveyor trolley 2 carrying the workpiece 4 to the detection system server 23 in the detection system control cabinet 24, the spraying program number, and the spraying data, and stores the received data. S3: The continuous conveyor 1 continues to move forward with the conveyor trolley 2 carrying the workpiece 4 to be sprayed. While the continuous conveyor 1 is moving, the number of the conveyor trolley 2 also moves along with the continuous conveyor 1, and passes through the primer confirmation area 8 and the primer pre-drying oven 9, and then enters the primer coating inspection area 10 for inspection. S4: Before conducting the inspection, first determine whether the inspection equipment is turned on. If the equipment is turned on, the equipment will send the number of the conveyor trolley 2 to the primer coating inspection device. The primer coating inspection device will compare the workpiece information of the sprayed workpiece 4 with the received number of the conveyor trolley 2. Then the primer coating inspection system will start all vision cameras and light sources to take pictures of the sprayed workpiece 4 for inspection. S5: After all the vision cameras have finished taking pictures of the surface of the workpiece 4 to be sprayed, the image information is transmitted to the detection device server 23. In the detection device server 23, the detection device server 23 will use the trained mathematical model to perform AI comparison and judgment on the photos of the workpiece 4 to determine whether there is any missed spraying of the primer coating on the workpiece 4, based on the vehicle model, workpiece combination form and primer color of the workpiece 4. S6: After completing step S5, if the inspection is qualified, the workpiece 4 to be sprayed is considered qualified, the inspection task is completed, and the workpiece 4 to be sprayed is sent out of the inspection station by the continuous conveyor equipment-1. S7: If a missed spraying condition is detected in step S5, the system will issue a missed spraying abnormality alarm. At this time, the production line will stop moving, and the operator will enter the site to observe, confirm, handle and record the situation. If the inspection is completed and it is found to be a false alarm, the production line will be reset and continue to operate. If there is indeed a missed spraying phenomenon, it needs to be handled manually. After the handling is completed, the equipment will be reset and the process will continue. The workpiece 4 will be inspected and the workpiece will be moved out of the inspection station by the conveyor trolley-2 driven by the continuous conveyor-1.
[0004] Further: In step S4, when taking pictures of the workpiece 4 to be coated, vision camera 11, vision camera 13 and vision camera 15 take pictures of the workpiece 4 mounted on the front of the conveyor trolley 2. Specifically, vision camera 11 takes pictures of the right side of the workpiece 4, vision camera 13 takes pictures of the top of the workpiece 4, and vision camera 15 takes pictures of the left side of the workpiece 4. Furthermore: In step S4, when taking pictures of the workpiece 4 to be coated, vision cameras 17, 19, and 21 take pictures of the rear of the workpiece 4 mounted on the conveyor trolley 2. Specifically, vision camera 15 takes pictures of the left side of the workpiece 4, vision camera 17 takes pictures of the top of the workpiece 4, and vision camera 19 takes pictures of the right side of the workpiece 4.
[0005] Beneficial technical effects of the present invention 1. This invention sets up six vision cameras and light sources to capture full coverage images of the workpiece surface from different angles. High-definition vision cameras are used. Because the vision cameras are installed at a high position, they are not affected by paint fog and do not occupy ground space. As needed, this system can also set up more vision cameras and can directly obtain vehicle type data from the production instruction system to inspect the primer spraying of bumpers for more vehicle models. 2. This technical solution can be applied to different car models and shapes, such as A-model bumper, A-model side skirt, A-model lower guard plate, B-model bumper, etc., as well as combinations of different parts of the same car model, such as identification using a front bumper and a rear bumper, or using a rear bumper and a rear bumper. 3. Through experiments, this technical solution utilizes defect samples for offline training to obtain a mathematical model. The system uses AI to identify workpieces with incomplete primer coating, achieving a 100% detection rate. The detectable surface area of the workpiece is high, exceeding 96%. The total investment in the identification system of this technical solution is low, less than 8% of the investment in a robot identification system. 4. This technical solution makes full use of existing production equipment and data, and interconnects with related equipment. No modification is required to the production instructions, etc. The equipment modification investment is low. When interconnected with the primer spraying equipment, it can collect the workpiece spraying information executed by the automatic primer spraying equipment; when interconnected with the conveying equipment, it can obtain the trolley number of the primer coating inspection area, and then match it with the workpiece spraying information. Attached Figure Description Figure 1 Schematic diagram of the layout of the primer spraying and testing production line of this invention; Figure 2 Figure 1 A top-view photograph of the condition of the primer coating inspection area 10; Figure 3 Figure 2 Image taken from the front view in the AA direction for inspection; Figure 4 Figure 2 Side view inspection image from the middle BB direction; Figure 5 The detection flowchart of this invention.
[0006] Example: In the picture: Continuous conveying equipment - 1, conveying trolley - 2, conveying control panel - 3, workpiece to be sprayed - 4, primer spraying chamber - 5, primer spraying robot - 6, robot control panel - 7, primer confirmation area - 8, primer pre-drying oven - 9, primer coating inspection area - 10, vision camera 1 - 11, light source 1 - 12, vision camera 2 - 13, light source 2 - 14, vision camera 3 - 15, light source 3 - 16, vision camera 4 - 17, light source 4 - 18, vision camera 5 - 19, light source 5 - 20, vision camera 6 - 21, light source 6 - 22, inspection device server - 23, inspection device control cabinet - 24.
[0007] To describe the structure and process of the present invention in more detail, the preferred embodiment of the present invention is given below in conjunction with the accompanying drawings.
[0008] Example 1: Working principle of the present invention The continuous conveyor 1 operates continuously. A pusher is installed on the conveyor chain of the continuous conveyor 1. The pusher pushes the conveyor trolley 2 carrying the workpiece forward. The conveyor trolley 2 stops at each station and continues to move forward after the work at that station is completed. Under the transport of the conveyor trolley 2 of the continuous conveyor 1, the workpiece 4 to be sprayed passes through the primer spraying chamber 5 in sequence. After the spraying effect is confirmed in the primer confirmation area 8, it passes through the primer pre-drying oven 9. After passing through the pre-baking oven 9, it enters the primer coating inspection area 10. The workpiece 4 to be coated is carried on the conveyor trolley 2, which is conveyed by the continuous conveyor equipment 1, and is in the primer spraying chamber 5. The primer spraying robot 6 performs primer spraying on the workpiece 4. In the primer pre-baking oven 9, the primer coating of the sprayed workpiece 4 is pre-baked to make the solid content of the coating reach more than 80%, and then it is transported to the primer coating inspection area 10 for inspection. In the primer coating inspection area 10, the inspection system automatically inspects the primer coating on the surface of the sprayed workpiece 4. If any workpiece is found to have missed spraying, incomplete spraying, or poor primer coating, it will be automatically detected in the primer coating inspection area 10.
[0009] Example 2: The working process of the present invention Under the control of the conveyor control panel 3, the conveyor trolley 2 carries the workpiece 4 to be sprayed into the primer spraying chamber 5, where the primer spraying robot 6 sprays the primer onto the workpiece 4. After the primer spraying robot 6 completes the spraying operation, the robot control panel 7 will send the spraying data to the primer coating detection system. The technical content sent includes the trolley number and spraying program number data; the primer coating detection system stores the relevant spraying data corresponding to the trolley number. The set conveyor control panel 3 records the position and trolley number of the conveyor trolley 2 in real time. When the current conveyor trolley 2 sends the workpiece 4 to be sprayed from the previous station to the next station, the trolley number will move synchronously. After the primer spraying robot 6 completes its spraying operation, the conveyor trolley 2 enters the primer confirmation area 8. The workpiece 4, which is to be sprayed, carried on the conveyor trolley 2, passes through the three stations of the primer pre-drying oven 9 in sequence, and is finally sent to the primer coating inspection area 10. The primer coating inspection area 10 is a frame space structure. Within the frame space, there are six sets of vision inspection cameras and light sources: a first vision camera 11, a first light source 12, a second vision camera 13, a second light source 14, a third vision camera 15, a third light source 16, a fourth vision camera 17, a fourth light source 18, a fifth vision camera 19, a fifth light source 20, a sixth vision camera 21, and a sixth light source 22. The six sets of vision inspection cameras and light sources are respectively set on the two sides of the upper part of the frame space, with three sets of vision inspection cameras and light sources on each side (left, center, and right). When photographing the workpiece 4 to be coated, vision cameras 11, 13, and 15 photograph the workpiece 4 mounted on the front of the conveyor trolley 2. Vision camera 11 photographs the right side of the workpiece 4, vision camera 13 photographs the top of the workpiece 4, and vision camera 15 photographs the left side of the workpiece 4. Vision cameras 17, 19, and 21 photograph the rear of the workpiece 4 mounted on the conveyor trolley 2. Vision camera 15 photographs the left side of the workpiece 4, vision camera 17 photographs the top of the workpiece 4, and vision camera 19 photographs the right side of the workpiece 4.
[0010] By taking pictures with the six sets of vision cameras of the primer coating inspection system, the surface of the coated workpiece 4 can be obtained. The obtained pictures are transmitted to the inspection device server 23 set in the inspection device control cabinet 24. The installed AI system judges and identifies the primer spraying status and detects the workpiece with poor primer coating. For the needs of assembly line production, the primer coating detection device can be continuously closed during the inspection. When the primer coating detection device is closed, the workpiece 4 to be sprayed on the conveyor trolley 2 is a workpiece that does not need to be inspected for primer coating. At this time, the conveyor trolley 2 can directly pass through the primer coating detection area 10 and enter the topcoat spraying chamber. When the primer coating inspection device is in the open state, it means that the workpiece 4 that is to be sprayed afterward is a workpiece that needs to be inspected. At this time, the workpiece 4 carried by the conveyor trolley 2 needs to be inspected. After the inspection is completed, the conveyor trolley 2 can be moved out and then enter the subsequent topcoat spraying chamber. When the workpiece 4 to be sprayed, carried by the conveyor trolley 2 to be inspected, arrives at the primer coating inspection area 10, the conveyor control panel 3 sends the trolley number of the conveyor trolley 2 that has entered the primer coating inspection area 10 to the inspection device server 23. The detection device server 23 matches the trolley number of the conveying trolley 2 with the previously saved trolley number data to obtain the primer spraying data of the workpiece 4 to be coated on the trolley, such as the spraying program number. After the detection device server 23 obtains the spraying data of the workpiece 4 in the primer coating detection area 10, it will automatically display the vehicle model, the workpiece combination form and the primer color of the workpiece 4. Furthermore: the vehicle model, the combination of workpieces carried, and the primer color refer to the fact that different vehicle models of parts to be painted can be carried on the conveyor trolley 2 on the same inspection line, different parts can be carried on one conveyor trolley 2 for painting, and workpieces 4 that need to be painted with different primer colors can be carried on different conveyor trolleys 2 at the front and rear. All these loading processes require that when the workpiece is placed on the conveyor trolley 2, the number of the conveyor trolley 2, the model of the loaded component, and the component number be entered into the production line system and transmitted to the inspection device server 23. In this way, the inspection device server 23 can compare the obtained data with the number of the conveyor trolley 2 entering the inspection flow stage, and determine which ones need to be inspected and which ones do not. When a trolley number that does not need to be inspected is encountered, the primer coating inspection device is turned off, so that the conveyor trolley 2 carrying the workpiece that does not need to be inspected can directly enter the topcoat spraying section. When the conveyor trolley 2 number obtained by the inspection device server 23 is a conveyor trolley 2 that needs to be inspected, the inspection device server 23 will turn on the six sets of vision cameras and light sources of the inspection device to take pictures and inspect the loaded workpiece 4. When the detection device server 23 starts to detect the coating of the workpiece 4 being sprayed, the detection device control cabinet 24 turns on the light source, including light source 12, light source 24, light source 36 and light source 48; then six sets of vision cameras take pictures of the workpiece 4 being sprayed, including vision camera 11, vision camera 23, vision camera 35, vision camera 47, vision camera 519 and vision camera 621. When taking pictures of the workpiece 4 to be sprayed, vision camera 11, vision camera 13 and vision camera 15 take pictures of the workpiece 4 to be sprayed, which is mounted on the front of the trolley. Vision camera 11 takes pictures of the right side of the workpiece 4 to be sprayed, vision camera 13 takes pictures of the top of the workpiece 4 to be sprayed, and vision camera 15 takes pictures of the left side of the workpiece 4 to be sprayed. When taking pictures of the workpiece 4 to be sprayed, vision camera 17, vision camera 19 and vision camera 21 take pictures of the rear of the workpiece 4 to be sprayed on the conveyor trolley 2, vision camera 15 takes pictures of the left side of the workpiece 4 to be sprayed, vision camera 17 takes pictures of the top of the workpiece 4 to be sprayed, and vision camera 19 takes pictures of the right side of the workpiece 4 to be sprayed. After the vision camera completes the image capture of the surface of the workpiece 4 to be sprayed, it transmits the image information to the detection device server 23. In the detection device server 23, the detection device server 23 will use the trained mathematical model to perform AI comparison and judgment on the photo of the workpiece 4 to determine whether there is any missed spraying of the primer coating on the workpiece 4, based on the vehicle model, workpiece combination form and primer color of the workpiece 4. If the detection device server 23 detects that the coating film on the surface of the sprayed workpiece 4 is intact, the device PC will display a normal status, and the primer coating film detection operation is completed at this time. If the detection device server 23 detects that the coating on the surface of the workpiece 4 is missing or incomplete, it will circle the area with missing coating and display it on the PC screen. When an anomaly is detected, the detection device server 23 issues an audible and visual alarm through the alarm on the detection device control cabinet 24, and simultaneously sends the anomaly to the continuous conveying control cabinet. When the continuous conveying control cabinet receives an abnormal signal, it will not allow the conveying trolley 2 of the primer coating inspection area 10 to leave the primer coating inspection area 10, and will wait for the on-site operator to handle the abnormality. After receiving the abnormal alarm signal, the on-site operator first checks the abnormal part information displayed on the detection system server 23, and then enters the primer coating detection area 10 to confirm the abnormal part of the sprayed workpiece 4. After confirmation, if there are no abnormalities in the workpiece 4 being sprayed, the operator manually resets the equipment, at which point the primer coating inspection is completed. After confirmation, if the surface of the workpiece 4 to be sprayed is indeed incomplete with primer coating, the operator first marks the workpiece 4 as scrap, and then manually resets the equipment. At this time, the primer coating inspection operation is completed, the primer coating inspection control panel sends the primer coating inspection operation completion command to the conveyor control panel 3, the stopper of the conveyor control panel 3 is closed, and the workpiece 4 to be sprayed carried by the conveyor trolley 2 is moved out of the primer coating inspection area 10.
[0011] Furthermore, the AI recognition software system is used to compare the captured photos with model photos in the trained mathematical model in order to find unqualified content. Therefore, the AI recognition software system is well known to those skilled in the art and will not be described in detail here.
Claims
1. A testing mechanism for the primer coating of an automotive bumper, characterized in that: This includes a workpiece conveying structure, a spraying structure, a primer coating detection device, and an analysis and identification device. The conveying structure is located at the front end of the production line and includes a continuous conveying device 1, a conveying trolley 2, a conveying control panel 3, and a workpiece to be sprayed 4. A pusher is provided on the conveying chain of the continuous conveying device 1, and the pusher is hung on the conveying trolley 2 carrying the workpiece to be sprayed 4. The spraying mechanism includes a primer spraying chamber 5, a primer spraying robot 6, a robot control panel 7, and a primer confirmation area 8. The primer spraying chamber 5 is set in an isolated space, and four primer spraying robots 6 are set in the isolated space. The primer coating detection device includes a primer pre-drying oven 9 and a primer coating detection area 10. The primer coating detection device is installed in the primer coating detection area 10. The primer coating detection device consists of six sets of visual detection devices, each set including a camera and a light source. The analysis and identification mechanism includes a detection device server 23 and a detection device control cabinet 24. An AI recognition software system is installed in the detection device server 23. The detection device server 23, the detection device control cabinet 24, and the analysis and identification mechanism are all connected by cables.
2. The automotive bumper primer coating testing mechanism according to claim 1, characterized in that: The two ends of the isolation space are made of flexible sealing material, and the conveyor trolley 2 carrying the workpiece 4 to be sprayed passes through the middle under the push of the continuous conveying equipment 1.
3. The automotive bumper primer coating testing mechanism according to claim 1, characterized in that: The four primer spraying robots 6 are set up in pairs, with two pairs in total. They are symmetrically arranged on both sides of the isolation space. The middle of the isolation space is the channel of the continuous conveying equipment 1, on which a conveying trolley 2 carrying the workpiece 4 to be sprayed is pushed.
4. The automotive bumper primer coating testing mechanism according to claim 1, characterized in that: The primer coating detection area 10 is configured as an isolated frame space with openings at both ends. Within the frame space, there are six sets of visual inspection cameras and light sources: a first visual camera 11, a first light source 12, a second visual camera 13, a second light source 14, a third visual camera 15, a third light source 16, a fourth visual camera 17, a fourth light source 18, a fifth visual camera 19, a fifth light source 20, a sixth visual camera 21, and a sixth light source 22.
5. The automotive bumper primer coating testing mechanism according to claim 4, characterized in that: The six sets of visual inspection cameras and light sources, namely, visual camera 11, light source 12, visual camera 13, light source 14, visual camera 15, light source 16, visual camera 17, light source 18, visual camera 19, light source 20, visual camera 21, and light source 22, are respectively set on both sides of the upper part of the facade of the frame space, with three sets of visual inspection cameras and light sources set on each side (left, center, and right).
6. The automotive bumper primer coating testing mechanism according to claim 1, characterized in that: The conveying control panel 3 of the continuous conveying equipment 1 and the robot control panel 7 of the primer spraying robot 6 are located on the side of the continuous conveying equipment 1 where personnel operate.
7. The automotive bumper primer coating testing mechanism according to claim 6, characterized in that: The conveying control panel 3 and the robot control panel 7 are connected to the controlled continuous conveying equipment 1 and the primer spraying robot 6 by cables.
8. A method for testing the primer coating of an automotive bumper, characterized in that: The implementation steps include the following: S1: The conveyor trolley 2 carries the workpiece 4 to be sprayed to the primer spraying chamber 5. The primer spraying robot 6 starts to spray the workpiece 4 under the control of the robot control panel 7. S2: After the spraying operation in step S1 is completed, the robot control panel 7 sends the number of the conveyor trolley 2 carrying the workpiece 4 to the detection system server 23 in the detection system control cabinet 24, the spraying program number, and the spraying data, and stores the received data. S3: The continuous conveyor 1 continues to move forward with the conveyor trolley 2 carrying the workpiece 4 to be sprayed. While the continuous conveyor 1 is moving, the number of the conveyor trolley 2 also moves along with the continuous conveyor 1, and passes through the primer confirmation area 8 and the primer pre-drying oven 9, and then enters the primer coating inspection area 10 for inspection. S4: Before conducting the inspection, first determine whether the inspection equipment is turned on. If the equipment is turned on, the equipment will send the number of the conveyor trolley 2 to the primer coating inspection device. The primer coating inspection device will compare the workpiece information of the sprayed workpiece 4 with the received number of the conveyor trolley 2. Then the primer coating inspection system will start all vision cameras and light sources to take pictures of the sprayed workpiece 4 for inspection. S5: After all the vision cameras have finished taking pictures of the surface of the workpiece 4 to be sprayed, the image information is transmitted to the detection device server 23. In the detection device server 23, the detection device server 23 will use the trained mathematical model to perform AI comparison and judgment on the photos of the workpiece 4 to determine whether there is any missed spraying of the primer coating on the workpiece 4, based on the vehicle model, workpiece combination form and primer color of the workpiece 4. S6: After completing step S5, if the inspection is qualified, the workpiece 4 to be sprayed is considered qualified, the inspection task is completed, and the workpiece 4 to be sprayed is sent out of the inspection station by the continuous conveyor equipment-1. S7: If a missed spraying condition is detected in step S5, the system will issue a missed spraying abnormality alarm. At this time, the production line will stop moving, and the operator will enter the site to observe, confirm, handle and record the situation. If the inspection is completed and it is found to be a false alarm, the production line will be reset and continue to operate. If there is indeed a missed spraying phenomenon, it needs to be handled manually. After the handling is completed, the equipment will be reset and the process will continue. The workpiece 4 will be inspected and the workpiece will be moved out of the inspection station by the conveyor trolley-2 driven by the continuous conveyor-1.
9. The method for detecting the primer coating of an automotive bumper according to claim 8, characterized in that: In the S4 step of photo detection, when taking photos of the workpiece 4 to be coated, vision camera 11, vision camera 13 and vision camera 15 take pictures of the workpiece 4 mounted on the front of the conveyor trolley 2. Specifically, vision camera 11 takes pictures of the right side of the workpiece 4, vision camera 13 takes pictures of the top of the workpiece 4, and vision camera 15 takes pictures of the left side of the workpiece 4.
10. The method for detecting the primer coating of an automotive bumper according to claim 8, characterized in that: In step S4, when taking pictures of the workpiece 4 to be coated, vision cameras 17, 19, and 21 take pictures of the rear of the workpiece 4 mounted on the conveyor trolley 2. Specifically, vision camera 15 takes pictures of the left side of the workpiece 4, vision camera 17 takes pictures of the top of the workpiece 4, and vision camera 19 takes pictures of the right side of the workpiece 4.