A machine vision imaging system suitable for borehole inner wall

Abstract

This invention discloses a machine vision imaging system suitable for the inner wall of an aperture, including an industrial camera. A 360° annular guide reflective cone is positioned below the lens of the industrial camera, and a light-guiding annular illumination structure is installed around the periphery of the 360° annular guide reflective cone. The 360° annular guide reflective cone of this invention adopts a circumferential reflective light-guiding design, utilizing the cone's mirror surface to export the image of the inner wall, ensuring imaging integrity and structural simplicity. The light-guiding annular illumination structure provides coaxial illumination and uniform supplementary lighting, with an LED light guide strip and diffuser combination to avoid strong reflections and shadow areas. The integrated structure, with modular camera, illumination, and reflective lens, eliminates the need for in-aperture focusing, simplifying installation. It eliminates the need for multi-view shooting, covering a 360° field of view in a single acquisition, improving detection efficiency and accuracy.

Description

Technical Field

[0001] This utility model relates to the field of industrial vision inspection and optical imaging technology, and in particular to a machine vision imaging system suitable for the inner wall of an aperture, which is suitable for the detection and dimensional measurement of micro-defects such as scratches, notches, foreign objects, and pits on the inner wall of the aperture. Background Technology

[0002] In industries such as machining, aerospace, and energy, there are many workpieces with structures such as deep holes, blind holes, and through holes, such as engine fuel injectors, hydraulic lines, valve seats, gear shafts, and cylinder liners. During use, the inner walls of these parts may develop the following defects: scratches, abrasions; cracks, corrosion; erosion, foreign matter adhesion; coating peeling, etc.

[0003] However, due to the small internal space and enclosed structure, traditional machine vision systems (standard camera + ordinary lighting) face the following difficulties in imaging:

[0004] 1) Illumination blind spots: Ordinary ring or area light sources cannot evenly illuminate the inner wall of the hole;

[0005] 2) Imaging blind zone: There is an angle between the camera's viewing angle and the aperture direction, making it impossible to obtain a complete image;

[0006] 3) Uneven brightness and low contrast: The internal structure produces strong shadows and reflections;

[0007] 4) Difficulty in system integration: Traditional lenses are large and difficult to insert into the aperture for alignment and shooting.

[0008] Currently common methods on the market have the following drawbacks:

[0009] 1) Method limitations;

[0010] 2) Fiber optic illumination + endoscope: low imaging quality, large image distortion, and small viewing angle;

[0011] 3) Laser cross-section scanning equipment is expensive and suitable for single-point measurement, not for full-area detection;

[0012] 4) Multi-directional LED + external camera, effective for apertures larger than 20mm, but not suitable for small apertures;

[0013] 5) Specular reflection shooting requires a complex focusing and lighting system, which is prone to defocusing;

[0014] Therefore, there is an urgent need to develop a dedicated visual imaging system with a compact structure, wide imaging angle, uniform illumination, and high image quality to solve the problem of detecting the inner wall of an aperture. Utility Model Content

[0015] To solve the above-mentioned technical problems, this utility model designs a machine vision imaging system suitable for the inner wall of an aperture.

[0016] The present invention adopts the following technical solution:

[0017] A machine vision imaging system suitable for the inner wall of an aperture includes an industrial camera, a 360° annular guide reflector cone disposed below the lens of the industrial camera, and a light guide annular illumination structure installed around the periphery of the 360° annular guide reflector cone.

[0018] Preferably, the industrial camera, the 360° annular guide reflector cone, and the light guide annular illumination structure are coaxially arranged.

[0019] Preferably, the light-guiding ring illumination structure uses an LED light guide strip.

[0020] Preferably, the LED light guide strip is covered with a diffuser.

[0021] Preferably, the industrial camera, the 360° annular guide reflector cone, and the light guide annular illumination structure are modularly installed.

[0022] The beneficial effects of this utility model are: (1) The 360° ring-shaped guide reflective cone adopts a ring-shaped reflective light guide design, and the inner wall image is exported by the cone mirror to ensure imaging integrity and structural simplicity; (2) The light guide ring illumination structure provides uniform illumination with coaxial illumination, and the combination of LED light guide strip and diffuser avoids strong reflection and shadow areas; (3) The integrated structure, with modular camera + illumination + reflective lens, does not require in-hole focusing and is easy to install; (4) No need for multi-angle shooting, a single acquisition covers a 360° field of view, improving detection efficiency and accuracy. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this utility model;

[0024] In the picture: 1. Industrial camera, 2. 360° ring-shaped guide reflector cone, 3. Light guide ring illumination structure. Detailed Implementation

[0025] The technical solution of this utility model will be further described in detail below through specific embodiments and with reference to the accompanying drawings:

[0026] Example: Figure 1 As shown, a machine vision imaging system suitable for the inner wall of an aperture includes an industrial camera 1, a 360° annular guide reflector cone 2 is provided below the lens of the industrial camera, and a light guide annular illumination structure 3 is installed around the periphery of the 360° annular guide reflector cone.

[0027] The industrial camera, 360° ring-shaped guide reflector cone, and light-guided ring illumination structure are coaxially arranged.

[0028] The light-guiding ring illumination structure uses an LED light guide strip. The LED light guide strip is covered by a diffuser. The industrial camera, 360° ring-shaped guide reflector cone, and light-guiding ring illumination structure are modularly mounted. The industrial camera is a miniature industrial camera.

[0029] When using this invention, the device is placed in front of the hole to be inspected before inspection. The positioning structure ensures that the 360° annular guide reflective cone is located in the center of the hole. The LED light guide ring emits bright, near-coaxial annular light, which illuminates the hole wall to form a uniform light curtain. The image of the hole wall is reflected by the mirror to the central cone, and then the reflective cone guides the image into the camera lens. After the camera acquires the image, it can be transmitted to the image processing unit in real time for texture analysis and defect identification.

[0030] This solution has the following advantages:

[0031] 1) The system structure can be externally mounted without the camera needing to be inserted into the hole, and internal images can be exported solely through reflection;

[0032] 2) Full-circumference imaging, showing the inner wall completely in 360° without rotation;

[0033] 3) Uniform lighting without shadows effectively avoids abrupt changes in light and dark and interference from high reflectivity;

[0034] 4) It has a compact structure and strong expandability, and is suitable for various hole diameters such as Φ5~Φ50mm.

[0035] Applicable to the following typical detection scenarios:

[0036] 1) Detection of cracks and wear on the inner walls of automotive parts (valve guides, oil passages, brake systems);

[0037] 2) Identification of carbide deposition in aircraft engine fuel nozzle orifices;

[0038] 3) Measurement of deep hole roughness or metal scratches in the field of mechanical manufacturing;

[0039] 4) Inspection of the inner surface of medical metal tubular fittings;

[0040] 5) Analysis of pinhole forming defects in injection molded parts.

[0041] The embodiments described above are merely preferred solutions of this utility model and are not intended to limit this utility model in any way. Other variations and modifications are possible without departing from the technical solutions described in the claims.

Claims

1. A machine vision imaging system suitable for use with the interior walls of a bore, comprising an industrial camera, characterized in that, The industrial camera has a 360° annular guide reflector cone below its lens, and a light guide annular illumination structure is installed around the 360° annular guide reflector cone.

2. The machine vision imaging system suitable for the inner wall of an aperture according to claim 1, characterized in that, The industrial camera, the 360° annular guide reflector cone, and the light guide annular illumination structure are coaxially arranged.

3. The machine vision imaging system suitable for the inner wall of an aperture according to claim 1, characterized in that, The light-guiding ring lighting structure uses an LED light guide strip.

4. A machine vision imaging system suitable for the inner wall of an aperture according to claim 3, characterized in that, The LED light guide strip is covered with a diffuser.

5. A machine vision imaging system suitable for the inner wall of an aperture according to claim 1, characterized in that, The industrial camera, 360° ring-shaped guide reflector cone, and light-guide ring illumination structure are modularly installed.

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