Object surface defect visual inspection mechanism

Abstract

The utility model relates to an object surface defect visual inspection mechanism which comprises a closed shell, and a camera component and a tunnel light source are mounted in the shell; the camera assembly comprises a plurality of vision cameras which are distributed at equal intervals, and the view fields of the adjacent vision cameras are partially overlapped; the tunnel light source comprises a plurality of light source units and a hollow arched cover with an opening at the bottom, the opening at the bottom of the arched cover faces a detected object, and the plurality of light source units are distributed along the inner circumference of the opening; a reflecting layer is arranged on the inner wall of the arched cover, so that light rays emitted by the plurality of light source units are uniformly irradiated to the surface of a detected object after being reflected on the inner wall; and detection holes corresponding to the visual cameras are formed in the top of the arched cover. According to the visual inspection mechanism for the surface defects of the object, by integrating an innovative multi-camera system and a tunnel light source technology, all-directional dead-corner-free detection coverage on curved-surface objects such as spherical objects is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of visual inspection equipment, in particular to a visual inspection mechanism for surface defects of an object. Background Art

[0002] In the existing technology, with the rapid development of industrial automation and intelligence, product quality testing has become an indispensable part of the production line. Especially in the food processing industry, such as the production of shelled eggs, it is particularly important to control product quality. High-quality eggs can not only improve consumers' eating experience, but also effectively ensure food safety and promote the company's brand image and market competitiveness.

[0003] Traditional egg quality inspection mainly relies on manual visual inspection. Although this method is intuitive, it has many shortcomings. First, manual inspection is inefficient and difficult to meet the needs of large-scale production. Second, manual inspection is easily affected by subjective factors, and the consistency and accuracy of the test results cannot be guaranteed. In order to overcome the above problems, some automated testing equipment has appeared on the market. These devices usually use a single camera with ordinary light source for detection.

[0004] However, these early automated solutions still have their limitations. For example, the detection range of a single camera is limited and it is difficult to cover the entire product surface. Ordinary light sources often cannot provide uniform lighting. For curved objects, a single-viewing angle camera still has blind spots, making it difficult to fully detect the entire surface, affecting the accuracy of detection. Summary of the invention

[0005] In order to solve the above problems, the utility model provides a mechanism for visually inspecting surface defects of spherical objects and other curved surface objects in all directions without blind spots.

[0006] In order to achieve the above-mentioned purpose, the utility model is designed to provide a visual detection mechanism for surface defects of an object, comprising a shell, which is closed and has a camera assembly and a tunnel light source installed inside; the camera assembly comprises a plurality of equally spaced visual cameras, and the fields of view of adjacent visual cameras partially overlap; the tunnel light source comprises a plurality of light source units and a hollow arched cover with an opening at the bottom, the bottom opening of the arched cover faces the object to be inspected, and the plurality of light source units are distributed along the inner circumference of the opening; a reflective layer is provided on the inner wall of the arched cover, so that the light emitted by the plurality of light source units is evenly irradiated onto the surface of the object to be inspected after being reflected on the inner wall; and a detection hole corresponding to each visual camera is provided on the top of the arched cover.

[0007] To improve detection coverage, the overlapping range of adjacent visual cameras’ fields of view is half of the field of view of a single visual camera.

[0008] In order to improve the efficiency and accuracy of detection, multiple vision cameras are arranged linearly and equidistantly along the length of the arch cover.

[0009] In order to evenly illuminate the surface of the detected object, the reflective layer is made of reflective paper or reflective coating.

[0010] In order to improve the protection performance and facilitate maintenance and overhaul, the shell is a waterproof and sealed structure, and movable doors are arranged around the shell.

[0011] To facilitate maintenance and upgrading, a support frame is also included, which includes a horizontal adjustment frame and a vertical adjustment frame. The vertical adjustment frame is fixedly installed inside the shell, and the horizontal adjustment frame is fixedly installed on the vertical adjustment frame. Multiple horizontal adjustment frames are arranged corresponding to the visual cameras to enable each visual camera to have horizontal adjustment capabilities.

[0012] In order to improve the adaptability and economy of the system, the detected object is a spherical object.

[0013] The object surface defect visual inspection mechanism designed by the utility model realizes all-round and blind-angle-free inspection coverage of curved objects such as spherical objects by integrating innovative multi-camera systems and tunnel light source technology, effectively solving the problem of limited field of view of existing single cameras; at the same time, a new type of tunnel light source structure is also set up, and the internal light source is reflected by the inner wall of the arc cover, so that the light can be evenly and shadowlessly illuminated to the entire surface of the inspected object, providing an excellent uniform lighting environment for high-precision defect identification, overcoming the defect of uneven illumination of ordinary flat light sources. The inspection process of this inspection mechanism does not require manual intervention and contact with the inspected object, realizing true automated non-destructive inspection, avoiding the inefficiency and subjective arbitrariness of manual inspection, and preventing possible surface damage of objects caused by contact inspection. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic diagram of the overall three-dimensional structure of Example 1;

[0015] Figure 2 is a schematic diagram of the three-dimensional structure of the movable door in Example 1 when it is opened;

[0016] Figure 3 is a schematic diagram of the structure of the camera assembly and the detection hole in Example 1;

[0017] Figure 4 It is a three-dimensional perspective view of the tunnel light source in Example 1.

[0018] Among them: a shell 1, a movable door 11, a camera assembly 2, a visual camera 21, a tunnel light source 3, a light source unit 31, an arch cover 32, a detection hole 321, a support frame 4, a horizontal adjustment bracket 41, a vertical adjustment bracket 42, and a light shield 5. DETAILED DESCRIPTION

[0019] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0020] Example 1.

[0021] like Figure 1-4 As shown, the object surface defect visual detection mechanism described in this embodiment includes a shell 1, which is closed and has a camera assembly 2 and a tunnel light source 3 installed inside; the camera assembly 2 includes a plurality of equidistantly distributed visual cameras 21, and the field of view of adjacent visual cameras 21 partially overlaps; the tunnel light source 3 includes a plurality of light source units 31 and a hollow arch cover 32 with an opening at the bottom, the bottom opening of the arch cover 32 faces the object to be inspected, and the plurality of light source units 31 are distributed along the inner circumference of the opening; a reflective layer is provided on the inner wall of the arch cover 32, so that the light emitted by the plurality of light source units 31 is evenly irradiated to the surface of the object to be inspected after being reflected on the inner wall; and a detection hole 321 corresponding to each visual camera 21 is provided on the top of the arch cover 32.

[0022] The object surface defect visual inspection mechanism provided in this embodiment is specifically for spherical objects, such as eggs such as chicken eggs and quail eggs, to perform automatic surface defect inspection. In the specific implementation process, the eggs to be inspected are sent to the inspection area, i.e., the opening area at the bottom of the arch cover 32, through a conveying mechanism (generally a transmission belt). This area is designed as the core position of the inspection to ensure that the eggs receive the most optimized lighting and visual inspection.

[0023] When the eggs enter the detection area, the multiple light source units 31 in the tunnel light source 3 are turned on immediately, and the light is reflected multiple times on the inner wall reflection layer of the arch cover 32 to form a uniform, shadow-free lighting environment. This design ensures that every point on the surface of the egg can be evenly illuminated, thereby minimizing the uneven lighting and shadow problems when the visual camera captures the image.

[0024] Driven by the conveying mechanism, the eggs slowly pass through the inspection area. At this time, the multiple visual cameras 21 in the camera assembly 2 are started and begin to work. Thanks to the partial overlapping design of the field of view of each visual camera 21, the entire surface of the eggs can be photographed in all directions without blind spots. Such a layout ensures that every detail of the egg surface can be captured by at least two cameras, thereby improving the accuracy and reliability of the inspection.

[0025] After the shooting is completed, each visual camera 21 transmits the captured egg surface image to the image processing system, which conducts in-depth analysis of the received image data and identifies any small defects on the egg surface, such as dents, scratches, cracks, stains, etc. The system performs quality classification on the eggs according to the recognition results to determine whether there are serious defects that affect the product quality. The test results are then output. For eggs with serious defects, the system will automatically remove them to prevent unqualified products from entering the market; and for qualified eggs, subsequent packaging and warehousing processes can be continued. Through such an automated detection process, not only the stability and consistency of product quality is ensured, but also the accuracy and efficiency of detection are greatly improved. In addition, the image processing system mentioned in this embodiment adopts existing technology, can efficiently process a large amount of image data, and provides strong technical support for the detection agency.

[0026] In some embodiments, in order to improve the detection coverage, the overlapping range of the fields of view of adjacent visual cameras 21 is half of the field of view of a single visual camera 21. In this way, the overlap of half of the fields of view can ensure the preservation of image splicing and continuity, and provide more data support for the image processing system, so that more complex algorithms can be used in the actual operation process to improve the accuracy of image analysis, for example, by comparing the image data in the overlapping area to improve the ability to identify defects.

[0027] In some embodiments, Figure 3 As shown, in order to improve the efficiency and accuracy of detection, multiple visual cameras 21 are arranged linearly and equidistantly along the length of the arch cover 32. In this way, the visual cameras 21 arranged linearly and equidistantly can evenly cover the entire detection area under the arch cover 32, ensuring that each area receives the same attention and detection strength, avoiding areas that may be missed due to uneven arrangement of the visual cameras 21, and using this arrangement method to make the relative position and angle consistent when collecting images, which helps the image processing system to more effectively stitch and analyze images, and improves the consistency and availability of image data. In addition, in this embodiment, six visual cameras 21 are provided to cover a detection area of ​​1000mm×400mm, so that the detection mechanism can adapt to the width distance of a general conveying mechanism, and has good adaptability and flexibility.

[0028] In some embodiments, in order to evenly illuminate the surface of the detected object, the reflective layer is made of reflective paper or a reflective coating. In this embodiment, the reflective paper or coating can be customized according to the arch cover 32 of different shapes and sizes, has strong adaptability, can adapt to various detection environments and requirements, and has low cost.

[0029] In some embodiments, Figure 1 and Figure 2As shown, in order to improve the protection performance and facilitate maintenance and overhaul, the housing 1 is a waterproof sealing structure, and a movable door 11 is arranged around the housing 1. In this embodiment, the waterproof sealing structure can effectively prevent moisture and dust from entering the interior of the device, and protect the internal electronic components and camera assembly 2 from damage, especially in a humid or dusty environment. This design ensures the long-term stable operation of the device, and the design of the movable door 11 allows the operator to easily access the internal components of the device for daily maintenance, cleaning or replacement of parts to meet new detection requirements or technical upgrades.

[0030] In this embodiment, if Figure 2 and Figure 3 As shown, a sunshade 5 is also arranged on the periphery of the camera assembly 2, which can effectively block external ambient light from directly shining on the working area of ​​the camera assembly 2, thereby reducing glare and reflection, improving image clarity and contrast, and ensuring the quality of image acquisition.

[0031] In some embodiments, in order to facilitate maintenance and upgrading, a support frame 4 is also included, and the support frame 4 includes a horizontal adjustment bracket 41 and a vertical adjustment bracket 42. The vertical adjustment bracket 42 is fixedly installed inside the outer shell 1, and the horizontal adjustment bracket 41 is fixedly installed on the vertical adjustment bracket 42. There are multiple horizontal adjustment brackets 41 corresponding to the visual cameras 21, so that each visual camera 21 has horizontal adjustment capabilities.

[0032] Utilizing this structural design, the combination of the horizontal adjustment bracket 41 and the vertical adjustment bracket 42 provides multi-directional adjustment capabilities, allowing the visual camera 21 to be fine-tuned in the horizontal direction to accommodate inspected objects of different sizes and shapes, ensuring that the camera's shooting angle is always optimal. At the same time, in this embodiment, the connections between the support brackets 4 are all fixed by bolts. When maintenance or upgrading is required, this design allows the visual camera 21 to be quickly disassembled and replaced without having to make large-scale changes to the entire system, which is of great significance for improving the overall performance and user experience of the visual inspection system.

[0033] The object surface defect visual inspection mechanism provided in this embodiment realizes all-round and blind-angle-free inspection coverage of curved objects such as spherical objects by integrating innovative multi-camera systems and tunnel light source technology, effectively solving the problem of limited field of view of existing single cameras; at the same time, a new type of tunnel light source structure is also set up, and the internal light source is reflected by the inner wall of the arc cover, so that the light can be evenly and shadowlessly illuminated to the entire surface of the inspected object, providing an excellent uniform lighting environment for high-precision defect identification, overcoming the defect of uneven illumination of ordinary flat light sources. The inspection process of this inspection mechanism does not require manual intervention or contact with the inspected object, realizing true automated non-destructive inspection, avoiding the inefficiency and subjective arbitrariness of manual inspection, and preventing possible surface damage of objects caused by contact inspection.

[0034] In the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0035] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A visual inspection mechanism for surface defects of an object, comprising a housing (1), It is characterized in that The housing (1) is closed, and a camera assembly (2) and a tunnel light source (3) are installed inside the housing; the camera assembly (2) comprises a plurality of equally spaced visual cameras (21), and the fields of view of adjacent visual cameras (21) partially overlap; the tunnel light source (3) comprises a plurality of light source units (31) and a hollow arched cover (32) with an opening at the bottom, the bottom opening of the arched cover (32) facing the object to be detected, and the plurality of light source units (31) are distributed along the inner periphery of the opening; a reflective layer is provided on the inner wall of the arched cover (32), so that light emitted by the plurality of light source units (31) is evenly irradiated onto the surface of the object to be detected after being reflected on the inner wall; and a detection hole (321) corresponding to each visual camera (21) is provided on the top of the arched cover (32).

2. The object surface defect visual detection mechanism according to claim 1, It is characterized in that The overlapping range of the fields of view of adjacent visual cameras (21) is half of the field of view of a single visual camera (21).

3. The object surface defect visual detection mechanism according to claim 2, It is characterized in that A plurality of vision cameras (21) are linearly arranged at equal distances along the length of the arch cover (32).

4. The object surface defect visual detection mechanism according to claim 3, It is characterized in that The reflective layer is made of reflective paper or reflective coating.

5. The object surface defect visual detection mechanism according to claim 2, It is characterized in that The housing (1) is a waterproof and sealed structure, and movable doors (11) are arranged around the housing (1).

6. The object surface defect visual detection mechanism according to any one of claims 1 to 5, It is characterized in that The invention also comprises a support frame (4), wherein the support frame (4) comprises a horizontal adjustment frame (41) and a vertical adjustment frame (42), wherein the vertical adjustment frame (42) is fixedly mounted inside the housing (1), and the horizontal adjustment frame (41) is fixedly mounted on the vertical adjustment frame (42), and a plurality of horizontal adjustment frames (41) are arranged corresponding to the visual cameras (21), so that each visual camera (21) has the ability to be adjusted horizontally.

7. The object surface defect visual detection mechanism according to claim 6, It is characterized in that The detected object is a spherical object.

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