A device and method for detecting surface quality of non-planar highly reflective parts

Abstract

The present invention provides a surface quality inspection device and method for non-planar highly reflective parts, comprising an operating table, a darkroom, an area array camera, two line array cameras, a motion drive mechanism and a motion tray; the darkroom is fixed to the operating table, a slide groove is provided on the operating table, the motion tray is slidably arranged in the slide groove, the motion drive mechanism is fixed to the operating table, the motion drive mechanism is transmission-connected to the motion tray and is used to drive the motion tray to slide along the slide groove, the area array camera and the two line array cameras are fixed to the darkroom in sequence along the sliding direction of the motion tray, the motion drive mechanism is used to drive the part to be tested to move, so that the area array camera and the line array camera jointly shoot the part to be tested from multiple angles, thereby solving the problem of high-resolution shooting of the purely flat surface of the highly reflective part, solving the problem of reflection caused by the unevenness of some surfaces by splicing the captured images, and solving the problem of high-definition shooting of some transparent surfaces by backlight shooting, and having good practicality.

Description

Technical Field

[0001] The present invention relates to the technical field of part surface quality detection, and in particular to a device and method for detecting the surface quality of a non-planar highly reflective part. Background Art

[0002] Machine vision inspection technology is widely used due to its high accuracy, non-contact nature, and excellent applicability. To achieve aesthetically pleasing results, many metal and injection-molded parts have non-planar and highly reflective surfaces. For example, some injection-molded parts on automotive dashboards are not only non-planar, highly reflective, but also partially transparent, and require extremely high surface quality. However, because high-precision imaging of such surfaces is extremely difficult, conventional machine vision imaging methods are unable to handle high-quality inspection of non-planar and highly reflective surfaces. Current inspection methods primarily rely on people with good eyesight to carefully observe from multiple angles to determine surface quality, resulting in low reliability. Summary of the Invention

[0003] The purpose of the present invention is to address the shortcomings of the existing technology and provide a non-planar high-reflective parts surface quality inspection device, including an operating table, a darkroom, an area array camera, two line array cameras, a motion drive mechanism and a motion tray;

[0004] The darkroom is fixed to the operating table;

[0005] There is a chute on the operating table;

[0006] The moving tray is slidably arranged in the slide groove;

[0007] The motion driving mechanism is fixed to the operating table and is in transmission connection with the motion tray, and is used to drive the motion tray to slide along the slide groove;

[0008] The area array camera and two line array cameras are fixed in the darkroom in sequence along the sliding direction of the moving tray.

[0009] Optionally, the area scan camera is oriented vertically toward the motion tray.

[0010] Optionally, the surface quality inspection device for non-planar highly reflective parts further includes a first bracket and a second bracket, the sliding directions of the moving trays of the first bracket and the second bracket are fixed in the darkroom in sequence, and the two line array cameras are respectively fixed to the first bracket and the second bracket.

[0011] Optionally, the first bracket is tilted toward the second bracket, and the second bracket is tilted toward the first bracket, and the directions of the two line array cameras are the same as the tilt directions of the corresponding first bracket and second bracket.

[0012] Optionally, the inclination angles of the first bracket and the second bracket are both 40° to 50°.

[0013] Optionally, the darkroom includes multiple frames, a darkroom door and a connecting beam. The multiple frames are fixed to the operating table in sequence along the sliding direction of the moving tray. The connecting beam penetrates and connects the multiple frames. The darkroom door is installed on one side of the frame.

[0014] Optionally, the device for detecting the surface quality of non-planar highly reflective parts further includes a fixture, which is fixed to the moving pallet.

[0015] Optionally, the surface quality detection device for non-planar highly reflective parts also includes a light source group and a photoelectric switch. The light source group includes a surface light source and two convex lens line light sources. The surface light source is fixed on the moving tray. The two convex lens line light sources are respectively fixed under the two line array cameras and are consistent with the direction of the line array cameras. The photoelectric switch is fixed in a dark room and is electrically connected to the light source group.

[0016] Optionally, the motion drive mechanism is a screw rod and a motor, the motor is fixed to the lower surface of the operating table, one end of the screw rod is connected to the motor, and the other end of the screw rod is screwed to the motion tray.

[0017] The present invention also provides a method for detecting the surface quality of a non-planar highly reflective part, which is performed by the above-mentioned non-planar highly reflective part surface quality detection device, and includes the following steps:

[0018] Open the darkroom and fix the parts to be inspected on the moving tray;

[0019] Close the darkroom and start the area array camera to shoot and obtain a first image;

[0020] Starting the motion drive mechanism to drive the motion tray to move forward, starting a line array camera to shoot, and acquiring a second image;

[0021] The motion driving mechanism is started to drive the motion tray to move in the reverse direction, and another linear array camera is started to shoot to obtain a third image;

[0022] The first image, the second image, and the third image are stitched together to obtain a complete image of the surface of the non-planar highly reflective part.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows: the surface quality inspection device for non-planar highly reflective parts of the present invention adopts a motion drive mechanism to drive the part to be tested to move, so that the area array camera and the line array camera jointly shoot the part to be tested at multiple angles, solving the problem of high-resolution shooting of the purely flat surface of the highly reflective part, and by splicing the captured images, solving the reflection problem caused by the unevenness of some surfaces, and solving the problem of high-definition shooting of some transparent surfaces by backlight shooting, which has good practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A three-dimensional diagram of the surface quality inspection device for non-planar highly reflective parts provided by the present invention;

[0025] Figure 2 This is a front view of the surface quality detection device for non-planar highly reflective parts provided by the present invention. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0027] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0028] The present invention will be further described below with reference to specific embodiments and drawings, but they are not intended to limit the present invention.

[0029] Combine Figure 1 and Figure 2 An embodiment of the present invention discloses a surface quality inspection device for non-planar highly reflective parts, comprising an operating table 1, a darkroom, an area array camera 4, a first line array camera 6, a second line array camera 9, a motion drive mechanism, and a motion tray 11; wherein the darkroom is fixed to the operating table 1; a slide groove is provided on the operating table 1; the motion tray 11 is slidably arranged in the slide groove; the motion drive mechanism is fixed to the operating table 1, and the motion drive mechanism is transmission-connected to the motion tray 11 for driving the motion tray 11 to slide along the slide groove; the area array camera 4 and two line array cameras are sequentially fixed to the darkroom along the sliding direction of the motion tray 11.

[0030] Furthermore, the surface quality inspection device for non-planar highly reflective parts of this embodiment further includes a first bracket 5 and a second bracket 8, the sliding directions of the moving tray 11 of the first bracket 5 and the second bracket 8 being fixed in a darkroom in sequence, and two line array cameras being fixed to the first bracket 5 and the second bracket 8, respectively. It is worth noting that in this embodiment, the first bracket 5 is tilted toward the second bracket 8, and the second bracket 8 is tilted toward the first bracket 5, and the orientations of the two line array cameras are the same as the tilt directions of the corresponding first bracket 5 and second bracket 8. The tilt angles of the first bracket 5 and the second bracket 8 are both 45°. Of course, according to actual needs, the tilt angles of the first bracket 5 and the second bracket 8 can be set between 40° and 50°. The area array camera 4 is perpendicular to the moving tray 11.

[0031] Furthermore, the darkroom includes multiple frames 2, a darkroom door and a connecting beam 3. The multiple frames 2 are fixed to the operating table 1 in sequence along the sliding direction of the moving tray 11. The connecting beam 3 penetrates and connects the multiple frames 2. The darkroom door is installed on one side of the frame 2.

[0032] Furthermore, the non-planar, highly reflective part surface quality inspection device also includes a fixture 13, a light source group, and a photoelectric switch 7. The fixture 13 is fixed to the moving tray 11 and is used to clamp and fix the part 14 to be inspected. The light source group includes a surface light source 12, a first convex lens line light source 15, and a second convex lens line light source 16. The surface light source 12 is fixed to the moving tray 11. The two convex lens line light sources are respectively fixed to two line array cameras, and the orientation of the convex lens line light sources is the same as that of the two line array cameras. The photoelectric switch 7 is fixed in a darkroom and is electrically connected to the light source group.

[0033] Furthermore, the motion driving mechanism includes a screw rod 17 and a motor 10 . The motor 10 is fixed to the lower surface of the operating table 1 . One end of the screw rod 17 is connected to the motor 10 , and the other end of the screw rod 17 is screwed to the motion tray 11 .

[0034] Since the parts 14 to be inspected are mostly plastic, they have highly reflective surfaces that are not completely flat and are partially transparent. Therefore, during the inspection process, reflections from a single angle can affect the surface quality of the parts 14 to be inspected. This embodiment, however, utilizes a low-angle line light source combined with a low-angle line array camera to address the problem of capturing high-resolution images of the flat surfaces of highly reflective parts. By stitching together two relatively low-angle images, it addresses the problem of reflections caused by uneven surfaces. Furthermore, backlit photography allows for high-definition capture of partially transparent surfaces.

[0035] This embodiment further provides a method for detecting the surface quality of a non-planar highly reflective component, which is performed using the non-planar highly reflective component surface quality detection device of this embodiment, and includes the following steps:

[0036] Open the darkroom and fix the parts to be inspected on the moving tray 11;

[0037] Close the darkroom and start the area array camera 4 to shoot and obtain a first image;

[0038] The motion driving mechanism is started to drive the motion tray 11 to move forward, and a linear array camera is started to shoot to obtain a second image;

[0039] The motion driving mechanism is started to drive the motion tray 11 to move in the reverse direction, and another linear array camera is started to shoot to obtain a third image;

[0040] The first, second, and third images are stitched together to obtain a complete image of the surface of a non-planar, highly reflective part. Finally, the image is analyzed to determine if the part has surface defects, and the defects are identified, classified, and graded, with prompts provided based on the results.

[0041] The above are only preferred embodiments of the present invention and do not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the contents of the present invention specification should be included in the protection scope of the present invention.

Claims

1. A device for detecting the surface quality of non-planar highly reflective parts, characterized in that: It includes an operating table, a darkroom, an area array camera, two line array cameras, a motion drive mechanism and a motion tray; The darkroom is fixed to the operating table; A chute is provided on the operating table; The movable tray is slidably arranged in the sliding groove; The motion drive mechanism is fixed to the operating table, and the motion drive mechanism is in transmission connection with the motion tray. Used to drive the moving tray to slide along the sliding groove; The area array camera and the two line array cameras are fixed in sequence in the darkroom along the sliding direction of the moving tray, and the area array camera is perpendicular to the moving tray; The apparatus further comprises a first bracket and a second bracket, the first bracket and the second bracket being fixed to the darkroom in sequence along the sliding direction of the moving tray, the two line scan cameras being fixed to the first bracket and the second bracket respectively; the first bracket and the second bracket are both inclined and facing each other, the two line scan cameras being oriented in the same direction as the corresponding inclination of the first bracket and the second bracket; the inclination angles of the first bracket and the second bracket are both 40°-50°; It also includes a light source group, the light source group includes a surface light source and two convex lens line light sources, the surface light source is fixed to the moving tray, and the two convex lens line light sources are respectively fixed under the two line array cameras and are aligned with the direction of the line array cameras; The non-planar highly reflective parts include highly reflective flat surfaces, non-flat surfaces, and partially transparent surfaces; the line array camera is used to photograph highly reflective flat surfaces and non-flat surfaces, and the area array camera is used to photograph transparent surfaces with backlighting; The area array camera is used to obtain a first image; one of the line array cameras is used to shoot when the pallet moves forward to obtain a second image; the other line array camera is used to shoot when the pallet moves backward to obtain a third image; the complete image of the surface of the non-planar highly reflective part is spliced by the first image, the second image and the third image.

2. The surface quality inspection device for non-planar highly reflective parts according to claim 1, characterized in that: The darkroom includes multiple frames, a darkroom door and a connecting beam. The multiple frames are fixed to the operating table in sequence along the sliding direction of the moving tray. The connecting beam penetrates and connects the multiple frames. The darkroom door is installed on one side of the frame.

3. The surface quality inspection device for non-planar highly reflective parts according to claim 1, characterized in that: Also included is a clamp fixed to the motion tray.

4. The surface quality inspection device for non-planar highly reflective parts according to claim 1, characterized in that: It also includes a photoelectric switch, which is fixed in the darkroom and electrically connected to the light source group.

5. The surface quality inspection device for non-planar highly reflective parts according to claim 1, characterized in that: The motion driving mechanism comprises a screw rod and a motor. The motor is fixed to the lower surface of the operating table. One end of the screw rod is connected to the motor, and the other end of the screw rod is screwed to the motion tray.

6. A method for detecting the surface quality of non-planar highly reflective parts, characterized in that: The method is carried out by using the non-planar high-reflective part surface quality detection device according to any one of claims 1 to 5, comprising the following steps: Open the darkroom and fix the parts to be inspected on the moving tray; Close the darkroom and start the area array camera to shoot and obtain a first image; Starting the motion drive mechanism to drive the motion tray to move forward, starting a line array camera to shoot, and acquiring a second image; The motion driving mechanism is started to drive the motion tray to move in the reverse direction, and another linear array camera is started to shoot to obtain a third image; The first, second, and third images are stitched together to obtain a complete image of the surface of the non-planar, highly reflective part. Finally, the image is used to analyze whether the part has surface defects.

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