An illumination device for defect detection

Abstract

This utility model relates to the field of defect detection and discloses a lighting device for defect detection, comprising: a main frame; a support assembly mounted on the main frame for carrying the object to be detected; a traveling mechanism mounted on the main frame and having a moving end capable of lateral movement; and a detection assembly located above the support assembly and fixedly connected to the moving end of the traveling mechanism, with a line scan camera and a pair of linear light sources fixedly mounted at the bottom; the two linear light sources are located on both sides of the line scan camera and are arranged crosswise. The crosswise arrangement of the linear light sources causes the light from both sides to converge at a certain angle to the center of the light source, thereby reducing background brightness and increasing the contrast of defects, thus highlighting vertical scratches parallel to the direction of object movement. This, combined with the line scan camera, improves the efficiency of defect detection.

Description

Technical Field

[0001] This utility model relates to the field of defect detection technology, and specifically to a lighting device for defect detection. Background Technology

[0002] Defect detection usually refers to the detection of surface defects of an item. Surface defect detection uses advanced machine vision inspection technology to detect defects such as spots, pits, scratches, color differences, and defects on the surface of a workpiece.

[0003] Light sources are an indispensable part of machine vision inspection systems. The selection of light sources is crucial in machine vision defect detection, especially in the detection of scratches. If traditional linear light sources are used, only "lateral defects" can be detected, while "vertical defects" are difficult to detect. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a lighting device for defect detection.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] An illumination device for defect detection, comprising:

[0007] Main framework;

[0008] The support assembly, mounted on the main frame, is used to support the object being tested;

[0009] The traveling mechanism is mounted on the main frame and has a moving end capable of lateral movement;

[0010] The detection component is located above the carrier component and is fixedly connected to the moving end of the traveling mechanism. A line scan camera and a pair of linear light sources are fixedly mounted at the bottom. The two linear light sources are located on both sides of the line scan camera and are arranged in a cross pattern.

[0011] By using intersecting linear light sources, the light from both sides converges at a certain angle to the center of the light source. This reduces background brightness and increases the contrast of defects, thus highlighting vertical scratches parallel to the direction of object movement. Combined with a line scan camera, this improves the efficiency of defect detection.

[0012] Furthermore, the focal point of the line scan camera is located at the point where the illumination from a pair of linear light sources overlaps.

[0013] Furthermore, the support assembly includes a fixed plate fixedly connected to the upper end of the support rod, and a tray for supporting the object to be inspected is rotatably connected to the upper end of the fixed plate via an electric rotating shaft. The electric rotating shaft drives the tray and the product to rotate, enabling omnidirectional inspection of the product.

[0014] Furthermore, multiple limiting clamps are installed on the upper end of the pallet. These clamps are used to fix the object being tested, preventing it from coming off during rotation.

[0015] Furthermore, the traveling mechanism includes a slide rail fixed laterally on the main frame and a pushing element mounted laterally on the main frame; the detection component is slidably connected to the slide rail, and the moving end of the pushing element is fixedly connected to the detection component; the moving end of the pushing element is the moving end of the traveling mechanism.

[0016] Furthermore, the pushing element is any one of a cylinder, an electric cylinder, or a linear module.

[0017] Furthermore, it also includes a horizontally installed isolation frame in the middle of the main frame, and a support rod installed in the middle of the isolation frame; the load-bearing assembly is installed on the support rod.

[0018] Furthermore, the detection component also includes a slide plate, a pair of mounting brackets installed under the slide plate, and a fixing rod connecting the two mounting brackets; the camera is mounted on the fixing rod, and the light source is located between the pair of mounting brackets with its two ends fixedly connected to the two mounting brackets respectively.

[0019] Furthermore, the traveling mechanism includes a slide rail fixed laterally on the main frame and a pushing element mounted laterally on the main frame; the moving end of the pushing element is fixedly connected to the slide plate; the slide plate is provided with a pair of slide grooves adapted to the slide rail, and the mounting bracket has an inverted "Y" shaped structure.

[0020] Compared with the prior art, the beneficial technical effects of this utility model are:

[0021] (1) By using a cross-arranged linear light source, the light from both sides converges at a certain angle to the middle position of the light source. By reducing the background brightness, the contrast of the defect is improved, thereby highlighting the vertical scratches parallel to the direction of the object's movement. Combined with a line scan camera, this improves the efficiency of defect detection.

[0022] (2) The electric rotating shaft drives the tray and the product to rotate, so as to achieve all-round inspection of the product. Attached Figure Description

[0023] Figure 1 This is a schematic diagram illustrating the application of the light source in this utility model;

[0024] Figure 2 This is a schematic diagram of the overall structure of this utility model;

[0025] Figure 3 This is a schematic diagram of the main frame structure of this utility model;

[0026] Figure 4This is a schematic diagram of the detection component structure of this utility model;

[0027] Figure 5 This is a schematic diagram of the support component structure of this utility model;

[0028] Figure 6 This is a schematic diagram of the main body of this utility model in its working state.

[0029] Explanation of the labels in the diagram:

[0030] 1. Main frame; 11. Slide rail; 12. Isolation frame; 13. Support rod; 14. Base plate; 15. Control module; 2. Detection component; 21. Slide plate; 22. Mounting bracket; 23. Linear light source; 24. Fixing rod; 25. Linear scan camera; 251. Lens; 3. Loading component; 31. Support plate; 32. Electric rotating shaft; 33. Fixing plate; 4. Traveling mechanism; 5. Object to be detected. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0032] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within the components of a compatible model. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] Example 1:

[0035] An illumination device for defect detection, please refer to [link / reference]. Figures 1 to 4 and Figure 6 The system includes a main frame 1, an isolation frame 12 in the middle of the main frame 1, a base plate 14 at the bottom of the main frame 1, a control module 15 installed inside the base plate 14, a pair of support rods 13 fixedly connected in the middle of the isolation frame 12, a support component 3 installed on the upper end of the support rods 13, a pair of slide rails 11 fixedly connected to the upper end of the main frame 1, a detection component 2 slidably connected on the slide rails 11, a traveling mechanism 4 corresponding to the position of the detection component 2 fixedly connected to the upper end of the main frame 1, the extended end of the traveling mechanism 4 fixedly connected to the detection component 2, the detection component 2 includes a slide plate 21, a pair of mounting brackets 22 at the lower end of the slide plate 21, the pair of mounting brackets 22 being connected to each other by a fixing rod 24, a line scan camera 25 installed at the lower end of the fixing rod 24, and a pair of linear light sources 23 installed at the lower end between the pair of mounting brackets 22.

[0036] Specifically, by using a cross-arranged linear light source, the light from both sides converges at a certain angle to the middle position of the light source. By reducing the background brightness, the contrast of the defect is improved, thereby highlighting the vertical scratches parallel to the direction of movement of the object being inspected 5. Combined with the line scan camera 25 and the corresponding lens 251, the efficiency of defect detection is improved. The traveling mechanism 4 makes the linear light source move at a uniform speed on the product surface, achieving high-efficiency detection and reducing the probability of missed detection.

[0037] Please see Figure 4 The slide plate 21 has a pair of slide grooves that are compatible with the slide rail 11. The mounting bracket 22 has an inverted "Y" shape. The inverted "Y" shape makes it easier for linear light sources to cross and converge.

[0038] Multiple shock-absorbing holes are provided on the mounting bracket 22, and the pair of linear light sources 23 are arranged in a cross structure.

[0039] The focal point of the line scan camera 25 is located at the point where the illumination from a pair of linear light sources 23 overlaps.

[0040] Example 2:

[0041] Compared to Example 1, please refer to Figure 5 The support assembly 3 in this embodiment also includes a fixed plate 33 fixedly connected to the upper end of the support rod 13. The upper end of the fixed plate 33 is rotatably connected to the support plate 31 through an electric rotating shaft 32. The electric rotating shaft 32 drives the support plate 31 and the product to rotate at a uniform speed, so as to realize the all-round inspection of the product.

[0042] Multiple limit clamps are installed on the upper end of the pallet 31 to fix the product and prevent it from coming off during rotation.

[0043] Working principle: First, the product to be inspected is placed on the tray 31 and fixed with a limiting clamp. Then, the device is started, and the linear light source 23 generates a beam of light to irradiate the product. The traveling mechanism 4 drives the detection component 2 to move horizontally, and together with the line scan camera 25, it detects defects on the surface of the product. At the same time, the electric rotating shaft 32 drives the tray 31 and the product to rotate, realizing all-round detection of defects and improving detection efficiency and effect.

[0044] Furthermore, it should be stated that this utility model protects the structure of the lighting device, and the parts that may involve control are all prior art.

[0045] The above description is only the best implementation method adopted by this utility model in combination with current actual needs, but the protection scope of this utility model is not limited thereto.

Claims

1. A lighting device for defect detection, characterized in that, include: Main framework (1); The support assembly (3) is installed on the main frame (1) and is used to support the object being tested; The traveling mechanism (4) is mounted on the main frame (1) and has a moving end capable of lateral movement; The detection component (2) is located above the support component (3) and is fixedly connected to the moving end of the traveling mechanism (4). A line scan camera (25) and a pair of linear light sources (23) are fixedly installed at the bottom. The two linear light sources (23) are located on both sides of the line scan camera (25) and are arranged in a cross pattern.

2. The lighting device for defect detection according to claim 1, characterized in that, The focal point of the line scan camera (25) is located at the point where the illumination from a pair of linear light sources (23) overlaps.

3. The lighting device for defect detection according to claim 1, characterized in that, The support assembly (3) includes a fixed plate (33) fixedly connected to the main frame (1), and the upper end of the fixed plate (33) is rotatably connected to a support plate (31) for carrying the object to be tested via an electric rotating shaft (32).

4. The lighting device for defect detection according to claim 3, characterized in that, The upper end of the tray (31) is equipped with multiple limiting clamps.

5. The lighting device for defect detection according to claim 1, characterized in that, The traveling mechanism (4) includes a slide rail (11) fixed laterally on the main frame (1) and a pushing element mounted laterally on the main frame (1); the detection component (2) is slidably connected to the slide rail (11), and the moving end of the pushing element is fixedly connected to the detection component (2); the moving end of the pushing element is the moving end of the traveling mechanism (4).

6. The lighting device for defect detection according to claim 5, characterized in that, The driving element can be any one of a pneumatic cylinder, an electric cylinder, or a linear module.

7. The lighting device for defect detection according to claim 1, characterized in that, It also includes a partition frame (12) horizontally installed in the middle of the main frame (1), and a support rod (13) installed in the middle of the partition frame (12); the load-bearing assembly (3) is installed on the support rod (13).

8. The lighting device for defect detection according to claim 1, characterized in that, The detection component (2) also includes a slide plate (21), a pair of mounting brackets (22) installed under the slide plate (21), and a fixing rod (24) connecting the two mounting brackets (22); the line scan camera (25) is installed on the fixing rod (24), and the linear light source (23) is located between the pair of mounting brackets (22) and the two ends of the linear light source (23) are fixedly connected to the two mounting brackets (22) respectively.

9. A lighting device for defect detection according to claim 8, characterized in that, The traveling mechanism (4) includes a slide rail (11) fixed laterally on the main frame (1) and a pushing element installed laterally on the main frame (1); the moving end of the pushing element is fixedly connected to the slide plate (21); a pair of slide grooves adapted to the slide rail (11) are provided on the slide plate (21); and the mounting bracket (22) has an inverted "Y" shaped structure.

Images