Annular stripe visual detection device

Abstract

The embodiment of the utility model discloses an annular stripe visual detection device, which is used for solving the technical problem that the detection effect of the existing visual detection device on the inner surface of an annular workpiece is poor. The detection device comprises a detection camera and a light source module arranged at the central position of a workpiece, the detection camera is located above the light source module; the light source module comprises an outer shell, an annular light source body, a reflecting mirror and a diffusion plate. The annular light source body and the diffusion plate are both installed on the outer shell, the diffusion plate is located at the light emitting end of the annular light source body, a printing plate with black stripes and white stripes arranged at intervals is arranged on the surface of the diffusion plate, and the reflector is arranged around the bottom of the outer shell. Light emitted by the annular light source body forms black and white stripes through the diffusion plate and irradiates the inner surface of a workpiece, and the light is reflected to the reflecting mirror through the inner surface of the workpiece so that the light can be reflected to the detection camera through the reflecting mirror.

Description

Technical Field

[0001] The utility model relates to the technical field of visual detection, in particular to a ring-shaped stripe visual detection device. Background Art

[0002] At present, in production applications, the most commonly used visual inspection devices include planar stripe light source modules. Specifically, the planar stripe light source module uses planar lighting to form light and dark interference straight stripes through the interference of reflected light. When the surface of the detected object is uneven, some straight stripes are deformed due to the change in optical path, so as to detect the uneven points and small defects on the surface of the component. However, since the planar stripe light source module can only realize planar lighting, when encountering annular workpieces (such as cylindrical workpieces, truncated cone workpieces, etc.), the above-mentioned planar stripe light source module cannot fully illuminate the inner surface (curved surface) of the annular workpiece, which leads to poor imaging effect and low detection accuracy.

[0003] Therefore, finding a technical solution that can solve the above technical problems has become an important topic studied by technical personnel in this field. Utility Model Content

[0004] The embodiment of the utility model discloses a ring-shaped stripe visual detection device, which is used to solve the technical problem that the existing visual detection device has a poor detection effect on the inner surface of a ring-shaped workpiece.

[0005] The embodiment of the utility model provides a circular stripe visual detection device, including a detection camera and a light source module placed at the center of a workpiece;

[0006] The detection camera is located above the light source module;

[0007] The light source module comprises an outer shell, an annular light source body, a reflector and a diffusion plate;

[0008] The annular light source and the diffuser are both mounted on the outer shell, and the diffuser is located at the light-emitting end of the annular light source, a printed plate with black stripes and white stripes arranged at intervals is provided on the surface of the diffuser, and the reflector is arranged around the bottom of the outer shell;

[0009] The light emitted by the annular light source forms black and white stripes through the diffusion plate and irradiates the inner surface of the workpiece. The light is reflected by the inner surface of the workpiece onto the reflector so that the reflector reflects the light to the detection camera.

[0010] Optionally, the black stripes in the printing plate are light shielding parts;

[0011] The white stripes in the printing plate are light-transmitting portions.

[0012] Optionally, the annular light source includes a PCB board with an annular structure and LED lamp beads electrically connected to the PCB board.

[0013] Optionally, the diffuser plate is a ring-shaped structure.

[0014] Optionally, the detection camera is also connected to a lens.

[0015] Optionally, the central axis of the detection camera, the central axis of the outer shell, the central axis of the annular light source body and the central axis of the diffusion plate coincide with each other.

[0016] Optionally, the outer shell, the annular light source body and the diffusion plate are all truncated cone structures.

[0017] Optionally, the reflector is a ring-shaped structure.

[0018] It can be seen from the above technical solutions that the embodiments of the utility model have the following advantages:

[0019] The annular stripe visual inspection device in this embodiment is suitable for inspecting workpieces with an annular structure. During the inspection process, the light emitted by the annular light source forms black and white stripes through the diffusion plate and irradiates the inner surface of the workpiece. The light is reflected from the inner surface of the workpiece to the reflector so that the reflector reflects the light to the inspection camera, thereby completing the imaging. In the above design, the use of an annular light source can realize curved surface lighting, so that the illuminated surface can fully cover the inner surface of the workpiece with an annular structure. The setting of the reflector can make the light reflected from the workpiece reflect into the inspection camera, so that the imaging effect is better and the inspection accuracy is higher, which effectively realizes the one-time all-round inspection of the inner surface defects of the annular structure workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A schematic diagram of the cross-sectional structure of a circular stripe visual detection device provided by an embodiment of the utility model;

[0022] Figure 2 A schematic diagram of the three-dimensional structure of a circular stripe visual detection device provided by an embodiment of the utility model;

[0023] Illustration: outer shell 1; annular light source 2; diffusion plate 3; printing plate 4; reflector 5; detection camera 6; workpiece A; inner surface a of the workpiece. DETAILED DESCRIPTION

[0024] The embodiment of the utility model discloses a ring-shaped stripe visual detection device, which is used to solve the technical problem that the existing visual detection device has a poor detection effect on the inner surface of a ring-shaped workpiece.

[0025] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0026] See also Figure 1 and Figure 2 , an annular stripe visual detection device provided by an embodiment of the utility model is specifically suitable for workpieces with annular structures, and includes a detection camera 6 and a light source module placed at the center of the workpiece;

[0027] The detection camera 6 is located above the light source module;

[0028] The light source module comprises an outer shell 1, an annular light source body 2, a reflector 5 and a diffuser plate 3;

[0029] The annular light source body 2 and the diffuser plate 3 are both mounted on the outer shell 1, and the diffuser plate 3 is located at the light-emitting end of the annular light source body 2, a printed plate 4 with black stripes and white stripes arranged at intervals is provided on the surface of the diffuser plate 3, and the reflector 5 is arranged around the bottom of the outer shell 1;

[0030] The light emitted by the annular light source 2 is irradiated to the inner surface of the workpiece through the diffusion plate 3 , and the light is reflected by the inner surface of the workpiece to the reflector 5 so that the reflector 5 reflects the light to the detection camera 6 .

[0031] It should be noted that the irradiation surface of the annular light source body 2 in this embodiment is parallel to the inner surface of the workpiece. In addition, the design of the diffusion plate 3 can make the light emitted by the annular light source body 2 more uniform.

[0032] The annular stripe visual inspection device in this embodiment is suitable for inspecting workpieces with an annular structure. During the inspection process, the light emitted by the annular light source body 2 forms black and white stripes through the diffusion plate 3 and irradiates the inner surface of the workpiece. The light is reflected by the inner surface of the workpiece to the reflector 5 so that the reflector 5 reflects the light to the inspection camera 6, thereby completing the imaging. In the above design, the use of the annular light source body 2 can realize curved surface lighting, so that the illuminated surface can fully cover the inner surface of the workpiece with an annular structure. The setting of the reflector 5 can make the light reflected from the workpiece reflect into the inspection camera 6, so that the imaging effect is better and the inspection accuracy is higher, which effectively realizes the one-time all-round inspection of the inner surface defects of the annular structure workpiece.

[0033] Furthermore, the black stripes in the printed plate 4 of this embodiment are light shielding portions;

[0034] The white stripes in the printing plate 4 are light-transmitting portions.

[0035] It should be noted that when the annular light source body 2 passes through the printed plate 4 of the diffuser plate 3, part of the light emitted by the annular light source body 2 passes through the white stripes and irradiates the inner surface of the workpiece, while the other part of the light passes through the black stripes and cannot irradiate the inner surface of the workpiece. Therefore, the light emitted by the annular light source body 2 finally forms striped light on the inner surface of the workpiece.

[0036] Furthermore, the annular light source body 2 in this embodiment includes a PCB board with an annular structure and LED lamp beads electrically connected to the PCB board.

[0037] It should be noted that there are multiple LED lamp beads in this embodiment, and the multiple LED lamp beads are arranged in a matrix on a PCB board with a ring structure.

[0038] Furthermore, the diffuser plate 3 in this embodiment is a ring-shaped structure.

[0039] It should be noted that the structure of the diffusion plate 3 in this embodiment matches the structure of the annular light source body 2 , that is, the plane of the diffusion plate 3 is parallel to the irradiation surface of the annular light source body 2 .

[0040] Furthermore, the detection camera 6 in this embodiment is also connected to a lens.

[0041] Furthermore, in this embodiment, the central axis of the detection camera 6, the central axis of the outer shell 1, the central axis of the annular light source body 2 and the central axis of the diffusion plate 3 coincide with each other.

[0042] It should be noted that, through the above design, the annular stripe visual detection device in this embodiment has better structural symmetry, ensuring that the light irradiated by the annular light source 2 to the inner surface of the workpiece is more uniform.

[0043] Furthermore, in order to ensure assembly fit, the outer shell 1, the annular light source body 2 and the diffusion plate 3 in this embodiment are all truncated cone structures.

[0044] Furthermore, in order to ensure that the light reflected from the inner surface of the workpiece can be fully reflected, the reflector 5 in this embodiment is a ring-shaped structure.

[0045] The above is a detailed introduction to a circular stripe visual detection device provided by the present invention. For a person skilled in the art, according to the idea of ​​the embodiments of the present invention, there may be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A circular fringe visual detection device, characterized in that: It includes a detection camera (6) and a light source module placed at the center of the workpiece; The detection camera (6) is located above the light source module; The light source module comprises an outer shell (1), an annular light source body (2), a reflector (5) and a diffusion plate (3); The annular light source body (2) and the diffuser plate (3) are both mounted on the outer shell (1), and the diffuser plate (3) is located at the light-emitting end of the annular light source body (2), a printed plate (4) with black stripes and white stripes arranged at intervals is provided on the surface of the diffuser plate (3), and the reflector (5) is arranged around the bottom of the outer shell (1); The light emitted by the annular light source (2) passes through the diffusion plate (3) to form black and white stripes and illuminates the inner surface of the workpiece. The light is reflected by the inner surface of the workpiece to the reflector (5), so that the reflector (5) reflects the light to the detection camera (6).

2. The annular stripe visual detection device according to claim 1, characterized in that: The black stripes in the printing plate (4) are light shielding parts; The white stripes in the printing plate (4) are light-transmitting portions.

3. The annular stripe visual detection device according to claim 1, characterized in that: The annular light source body (2) comprises a PCB board with an annular structure and LED lamp beads electrically connected to the PCB board.

4. The annular stripe visual detection device according to claim 1, characterized in that: The diffusion plate (3) is a ring-shaped structure.

5. The annular stripe visual detection device according to claim 1, characterized in that: The detection camera (6) is also connected to a lens.

6. The annular stripe visual detection device according to claim 1, characterized in that: The central axis of the detection camera (6), the central axis of the outer shell (1), the central axis of the annular light source body (2) and the central axis of the diffusion plate (3) coincide with each other.

7. The annular stripe visual detection device according to claim 1, characterized in that: The outer shell (1), the annular light source body (2) and the diffusion plate (3) are all truncated cone structures.

8. The annular stripe visual detection device according to claim 1, characterized in that: The reflector (5) is a ring-shaped structure.

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