A system for detecting defects in the inner wall of a hole in a sheet member
By using multiple line scan cameras and linear light sources in the plate hole inner wall defect detection system, combined with a conveying mechanism and control system, the problems of slow detection speed and low accuracy of plate hole inner wall are solved, realizing dynamic high-precision imaging and efficient detection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGDONG POLYTECHNIC COLLEGE
- Filing Date
- 2025-06-05
- Publication Date
- 2026-07-21
Smart Images
Figure CN224535832U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of defect detection, and more specifically, to a defect detection system for the inner wall of a hole in a plate. Background Technology
[0002] Detection of defects on the inner wall of holes in sheet metal is limited by the confined space inside the holes. Currently, semi-automatic static imaging devices based on area array cameras are mostly used to acquire images, which have low speed and accuracy. Existing technologies mainly disclose two detection methods: one is to align a fisheye lens or an endoscope with an angled reflector with the center of the hole to statically acquire an image of the inner wall of the hole; the other is to insert an endoscope into the camera hole and rotate the camera to capture an image of the inner wall of the hole.
[0003] Both of the above detection methods are static imaging methods, requiring the camera to be aligned with the center of each hole while the workpiece is stationary before acquiring the image. The shortcomings of existing technologies lead to four consequences: slow speed and high cost; the narrow internal space of the holes means that ring light sources and area array cameras can only image at a small tilt angle above or below the holes, resulting in significant image distortion; if endoscopic imaging is used, the number of pixels is low, leading to poor resolution; and the random errors in part positioning and clamping are relatively large.
[0004] Currently, defects in the inner wall of the camera hole on the back panel of mobile phones, such as scratches, erosion, and cracks, are still detected using the aforementioned static detection technology. This technology is slow, has low accuracy, and is inefficient. It cannot be integrated with high-speed automatic detection of other parts, which greatly affects the development of related industries. Utility Model Content
[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a defect detection system for the inner wall of holes in plates, which can meet the requirements of dynamic high-precision imaging of the inner wall of holes in plates transported at high speeds. It can be matched with the production line and inspection line of plates to improve the detection speed and accuracy.
[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: A plate hole inner wall defect detection system is provided, including a frame, a control system, a conveying mechanism, multiple line scan cameras, and a linear light source. The conveying mechanism is mounted on the frame, and its output end is connected to the plate. The conveying mechanism is used to drive the plate to move horizontally at a constant speed. The multiple line scan cameras and the linear light source are respectively located above or below the plate conveying plane, and are used to capture images of the inner wall of the holes in the plate. The line scan cameras and the linear light source are respectively communicatively connected to the control system, and the control system is used to detect the captured images of the inner wall of the holes and determine the defects in the inner wall of the holes.
[0007] This invention relates to a plate hole inner wall defect detection system. Multiple line scan cameras and linear light sources can be arranged at various points along the plate's transport path as needed. During operation, the plate is transported via a conveyor mechanism. The control system controls the multiple line scan cameras and linear light sources to capture images of the inner wall of the plate's holes, obtaining multiple complementary local images. Defects in the inner wall of the holes are detected by comprehensively analyzing these complementary local images. The multiple line scan cameras and linear light sources, which communicate with the control system, enable dynamic, high-precision imaging of the inner wall of holes in high-speed transported plates. This system can be integrated with plate production and inspection lines, improving both detection speed and accuracy.
[0008] Furthermore, the illumination projection line of the linear light source and the imaging scan line of the line scan camera both form a preset angle with the plane where the plate is located.
[0009] Furthermore, the control system includes a computer and a controller. The computer, the line scan camera, and the linear light source are respectively communicatively connected to the controller. The computer is used to process the captured images of the inner wall of the hole and determine defects in the inner wall of the hole.
[0010] Furthermore, the control system also includes a plurality of position sensors disposed on the rack, the position sensors being communicatively connected to the controller.
[0011] Furthermore, guide rails are provided on both sides of the top of the frame. Each of the two guide rails has a vertically intersecting conveying support surface and a transmission guide surface on the side that is close to each other. The conveying support surface is located in the horizontal plane, and the transmission guide surface is located in the vertical plane.
[0012] Furthermore, the conveying mechanism includes a driving mechanism and conveyor belts respectively mounted on the two guide rails. The two conveyor belts are respectively supported on the conveying support surfaces of the two guide rails. The output end of the driving mechanism is connected to the conveyor belts for transmission. The two ends of the plate are respectively placed on the top of the two conveyor belts and located between the transmission guide surfaces of the two guide rails. An imaging scanning area with vertical and horizontal cutouts is formed between the two conveyor belts, and the hole of the plate is located in the imaging scanning area.
[0013] Furthermore, the conveying mechanism may also include a drive mechanism, a tray, and conveyor belts respectively mounted on the two guide rails. The two conveyor belts are respectively supported on the conveying support surfaces of the two guide rails. The tray is used to place the plate. The two ends of the tray are supported on the top of the two conveyor belts and located between the transmission guide surfaces of the two guide rails. The tray is provided with an imaging scanning area with upper and lower cutouts. The hole of the plate is located in the imaging scanning area.
[0014] Furthermore, one, two, or more of the aforementioned plates are placed on top of the tray, and the holes in each of the plates are located within the imaging scanning area.
[0015] The tray is equipped with a turntable that can rotate within the tray transport plane, and the imaging scanning area is located within the turntable.
[0016] Furthermore, the conveying mechanism includes a first conveying line, a turning mechanism, and a second conveying line arranged sequentially along the frame. The first conveying line is used to convey the plate along the length direction of the plate. The turning mechanism rotates the plate by 90 degrees or translates the plate along the width direction of the plate before conveying the plate to the second conveying line. The second conveying line is used to convey the plate along the width direction of the plate.
[0017] Compared with the prior art, the beneficial effects of this utility model are: it can meet the dynamic high-precision imaging of the inner wall of the hole in the plate during high-speed conveying, and can be matched with the plate production line and inspection line to improve the inspection speed and accuracy. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the plate conveying imaging in Embodiment 1 of this utility model;
[0019] Figure 2 This is a schematic diagram of the plate conveying imaging in Embodiment 2 of this utility model;
[0020] Figure 3 This is a schematic diagram of the plate being transported and imaged on the turntable in Embodiment 3 of this utility model;
[0021] Figure 4 This is a schematic diagram of the plate hole inner wall defect detection system in the embodiment of this utility model from a first-view perspective;
[0022] Figure 5 This is a schematic diagram of the plate hole inner wall defect detection system in an embodiment of the present invention from a second perspective.
[0023] In the attached diagram: 1-frame; 11-guide rail; 2-conveying mechanism; 21-first conveyor line; 22-steering mechanism; 23-second conveyor line; 24-conveyor belt; 25-pallet; 251-turntable; 3-line scan camera; 4-linear light source; 5-position sensor; 6-plate. Detailed Implementation
[0024] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.
[0025] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.
[0026] In this embodiment of the utility model, "the hole of the plate is completely exposed" and "the hole to be tested of the plate is completely exposed" both mean that both ends of the hole to be tested on the plate can be imaged at any incident angle and reflection angle, and the conveying mechanism does not obstruct the illumination projection line and the imaging scanning line.
[0027] Example 1
[0028] This embodiment is the first embodiment of a plate hole inner wall defect detection system, such as... Figure 1 , Figure 4 and Figure 5 As shown, the system includes a frame 1, a control system, a conveying mechanism 2, multiple line scan cameras 3, and a linear light source 4. The conveying mechanism 2 is mounted on the frame 1, and its output end is connected to the plate 6. The conveying mechanism 2 is used to drive the plate 6 to move horizontally at a constant speed. The multiple line scan cameras 3 and the linear light source 4 are located above or below the conveying plane of the plate 6, respectively, and are used to capture images of the inner wall of the holes in the plate 6. The line scan cameras 3 and the linear light source 4 are respectively connected to the control system, which is used to detect the captured images of the inner wall of the holes and determine the defects in the inner wall of the holes.
[0029] The aforementioned plate hole inner wall defect detection system utilizes multiple line scan cameras 3 and linear light sources 4, which can be arranged at various points along the conveying path of the plate 6 as needed. During operation, the plate 6 is conveyed via the conveying mechanism 2, ensuring the holes of the plate 6 are fully exposed. The control system controls the multiple line scan cameras 3 and linear light sources 4 to capture images of the inner wall of the holes in the plate 6, obtaining multiple complementary local images of the inner wall. Defects in the inner wall of the holes are detected by comprehensively analyzing these complementary local images. The multiple line scan cameras 3 and linear light sources 4, which communicate with the control system, can provide dynamic, high-precision imaging of the inner wall of the holes in the high-speed conveyed plate 6. The detection system can be matched with the production line and inspection line of the plate 6, improving both detection speed and accuracy.
[0030] The illumination projection lines of the linear light source 4 and the imaging scanning lines of the line scan camera 3 both form a preset angle with the plane where the plate 6 is located. Specifically, the angle between the light emitted by the linear light source 4 and the light received by the line scan camera 3 is an acute angle. In practice, a low-angle image of the inner wall of the hole can be obtained, making the defects more obvious in the image, thereby facilitating detection and analysis and improving the accuracy of detection.
[0031] The control system includes a computer and a controller. The computer, line scan camera 3, and linear light source 4 are all communicatively connected to the controller. The computer processes the captured images of the inner wall of the hole and determines defects in the inner wall. Specifically, the control system also includes multiple position sensors 5 mounted on the frame 1, which are communicatively connected to the controller. In practice, when the plate being inspected 6 passes through a predetermined imaging position, the position sensors 5 drive the corresponding line scan camera 3 and linear light source 4 through the controller to acquire images of the inner wall of the hole. The computer processes multiple images from different orientations and comprehensively detects defects in the inner wall of the hole.
[0032] like Figure 1 As shown, guide rails 11 are provided on both sides of the top of the frame 1. On the side of the two guide rails 11 that are close to each other, there are vertically intersecting conveying support surfaces and conveying guide surfaces. The conveying support surfaces are located in the horizontal plane, and the conveying guide surfaces are located in the vertical plane.
[0033] The conveying mechanism 2 includes a drive mechanism and conveyor belts 24 respectively mounted on two guide rails 11. The two conveyor belts 24 are respectively supported on the conveying support surfaces of the two guide rails 11. The output end of the drive mechanism is connected to the conveyor belts 24 for transmission. The two ends of the plate 6 are respectively placed on top of the two conveyor belts 24 and located between the transmission guide surfaces of the two guide rails 11. An imaging scanning area with vertical cutouts is formed between the two conveyor belts 24, and the holes of the plate 6 are located within the imaging scanning area. In implementation, the drive mechanism drives the two conveyor belts 24 to move, and under the guidance of the two transmission guide surfaces, it drives the plate 6 to move. The guide rails 11 are mounted on the frame 1 at a preset height. The space reserved along the frame 1 allows for the installation of multiple line scan cameras 3 and linear light sources 4 for imaging from multiple directions.
[0034] like Figure 4 , Figure 5As shown, the conveying mechanism 2 includes a first conveying line 21, a turning mechanism 22, and a second conveying line 23 arranged sequentially along the frame 1. The first conveying line 21 is used to convey the plate 6 along its length. After receiving the plate 6 conveyed by the first conveying line 21, the turning mechanism 22 rotates the plate 6 by 90 degrees or translates it along its width, conveying the plate 6 to the starting point of the second conveying line 23. The second conveying line 23 is used to convey the plate 6 along its width. In practice, line scan cameras 3 and linear light sources 4 can be installed along the first conveying line 21, the turning mechanism 22, and the second conveying line 23 for imaging. The plate 6 passes through each section of the conveying line sequentially, completing multi-angle scanning imaging to obtain more information and higher precision local images of the hole's inner wall. This satisfies the need for complementary imaging of multi-directional local images of the hole's inner wall, and then uses the complementary images to comprehensively detect defects in the hole's inner wall.
[0035] Example 2
[0036] This embodiment is the second embodiment of the plate hole inner wall defect detection system. This embodiment is similar to the first embodiment, except that in this embodiment, the plate 6 is a small, fragile thin plate, and the plate 6 is supported by the tray 25 for detection. Figure 2 As shown, guide rails 11 are respectively provided on both sides of the top of the frame 1. Each guide rail 11 has a vertically intersecting conveying support surface and a transmission guide surface on its side closest to each other. The conveying support surface is located in a horizontal plane, and the transmission guide surface is located in a vertical plane. The conveying mechanism 2 includes a drive mechanism, a tray 25, and conveyor belts 24 respectively mounted on the two guide rails 11. The two conveyor belts 24 are respectively supported on the conveying support surfaces of the two guide rails 11. The tray 25 is used to place the plate 6. The two ends of the tray 25 are supported on the top of the two conveyor belts 24 and located between the transmission guide surfaces of the two guide rails 11. The tray 25 has an imaging scanning area with vertical cutouts, and the hole of the plate 6 is located within the imaging scanning area. In practice, the plate 6 is placed on the tray 25, so that the hole to be tested on the plate 6 is located within the imaging scanning area. The drive mechanism drives the tray 25 and the plate 6 on it to move. The vertical cutout imaging scanning area completely exposes the hole to be tested on the plate 6, so that the line scan camera 3 can acquire the image of the inner wall of the hole at a low angle.
[0037] like Figure 4 , Figure 5As shown, the conveying mechanism 2 includes a first conveyor line 21, a turning mechanism 22, and a second conveyor line 23 arranged sequentially along the frame 1. The first conveyor line 21 is used to convey the pallet 25 along the length direction of the plate 6; the turning mechanism 22 is used to receive the pallet 25 conveyed by the first conveyor line 21 and convey the pallet 25 to the second conveyor line 23, and the turning mechanism 22 is used to rotate the pallet 25 by 90 degrees or translate the pallet 25 along the width direction of the plate 6; the second conveyor line 23 is used to convey the pallet 25 along the width direction of the plate 6. By using the pallet 25 to carry the plate 6, the efficiency of the plate 6 being transferred on the first conveyor line 21, the turning mechanism 22, and the second conveyor line 23 can be improved.
[0038] One, two, or more plates 6 can be placed on the top of the tray 25, and the hole to be inspected on each plate 6 is located within the imaging scanning area. The imaging of the inner walls of the holes of multiple plates 6 is completed in parallel during one transport scan of the tray 25.
[0039] Example 3
[0040] This embodiment is the third embodiment of the plate hole inner wall defect detection system. This embodiment is similar to embodiment two, except that, as Figure 3 As shown, the tray 25 is equipped with a turntable 251 that can rotate within the transport plane of the tray 25, and the imaging scanning area is located within the turntable 251. Specifically, the plate 6 to be inspected is loaded onto the turntable 251, and the hole distribution area of the plate 6 is located within the imaging scanning area on the turntable 251. During imaging, the transport mechanism 2 and the tray 25 provide unobstructed views of the projected light and the scanning imaging line from all directions. During inspection, since the turntable 251 can rotate, the tray 25 moves in a plane along the guide rail 11 under the drive of the transport mechanism 2, passing through each imaging point in sequence. After the line scan camera 3 completes the corresponding imaging scan at each imaging point, the turntable 251 deflects by a preset angle under the control of the control system, so that the subsequent line scan camera 3 can take the next image of the inner wall of the hole from the deflected angle.
[0041] In this embodiment, the transmission line of the conveying mechanism 2 is a straight line without segments or a turning mechanism 22.
[0042] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.
[0043] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.
Claims
1. A system for detecting defects in the inner wall of holes in plate components, characterized in that, The system includes a frame (1), a control system, a conveying mechanism (2), multiple line scan cameras (3) and a linear light source (4). The conveying mechanism (2) is mounted on the frame (1), and its output end is connected to the plate (6). The conveying mechanism (2) is used to drive the plate (6) to move horizontally at a constant speed. The multiple line scan cameras (3) and the linear light source (4) are located above or below the conveying plane of the plate (6) and are used to capture images of the inner wall of the hole in the plate (6). The line scan cameras (3) and the linear light source (4) are respectively connected to the control system. The control system is used to detect the captured images of the inner wall of the hole and determine the defects in the inner wall of the hole.
2. The plate hole inner wall defect detection system according to claim 1, characterized in that, The illumination projection line of the linear light source (4), the imaging scanning line of the line scan camera (3), and the plane where the plate (6) is located form a preset angle.
3. The plate hole inner wall defect detection system according to claim 1 or 2, characterized in that, The control system includes a computer and a controller. The computer, the line scan camera (3), and the linear light source (4) are respectively connected to the controller in communication. The computer is used to process the captured images of the inner wall of the hole and determine the defects in the inner wall of the hole.
4. The plate hole inner wall defect detection system according to claim 3, characterized in that, The control system also includes a plurality of position sensors (5) disposed on the frame (1), and the position sensors (5) are communicatively connected to the controller.
5. The plate hole inner wall defect detection system according to claim 1, characterized in that, The top two sides of the frame (1) are respectively provided with guide rails (11). The two guide rails (11) are provided with a vertically intersecting conveying support surface and a transmission guide surface on the side that is close to each other. The conveying support surface is located in the horizontal plane and the transmission guide surface is located in the vertical plane.
6. The plate hole inner wall defect detection system according to claim 5, characterized in that, The conveying mechanism (2) includes a driving mechanism and conveyor belts (24) respectively mounted on the two guide rails (11). The two conveyor belts (24) are respectively supported on the conveying support surfaces of the two guide rails (11). The output end of the driving mechanism is connected to the conveyor belts (24) for transmission. The two ends of the plate (6) are respectively placed on the top of the two conveyor belts (24) and located between the transmission guide surfaces of the two guide rails (11). An imaging scanning area with upper and lower hollows is formed between the two conveyor belts (24). The hole of the plate (6) is located in the imaging scanning area.
7. The plate hole inner wall defect detection system according to claim 5, characterized in that, The conveying mechanism (2) includes a drive mechanism, a tray (25), and conveyor belts (24) respectively mounted on the two guide rails (11). The two conveyor belts (24) are respectively supported on the conveying support surfaces of the two guide rails (11). The tray (25) is used to place the plate (6). The two ends of the tray (25) are supported on the top of the two conveyor belts (24) and located between the transmission guide surfaces of the two guide rails (11). The tray (25) is provided with an imaging scanning area with upper and lower cutouts. The hole of the plate (6) is located in the imaging scanning area.
8. The plate hole inner wall defect detection system according to claim 7, characterized in that, One, two or more of the plates (6) are placed on top of the tray (25), and the holes of each plate (6) are located within the imaging scanning area.
9. The plate hole inner wall defect detection system according to claim 7, characterized in that, The tray (25) is provided with a turntable (251) that can rotate within the transport plane of the tray (25), and the imaging scanning area is located within the turntable (251).
10. The plate hole inner wall defect detection system according to claim 1, characterized in that, The conveying mechanism (2) includes a first conveying line (21), a turning mechanism (22) and a second conveying line (23) arranged sequentially along the frame (1). The first conveying line (21) is used to convey the plate (6) along the length direction of the plate (6). The turning mechanism (22) rotates the plate (6) by 90 degrees or translates the plate (6) along the width direction of the plate (6) and then conveys the plate (6) to the second conveying line (23). The second conveying line (23) is used to convey the plate (6) along the width direction of the plate (6).