A system for detecting cracks on the surface of frosted magnetic cores

Abstract

The utility model relates to the technical field of machine vision detection, and discloses a detection system for surface cracks of frosted magnetic cores, including an image acquisition module, a blue light ring light source, and a red light ring light source; wherein the image acquisition module, the blue light ring light source, and the red light ring light source are coaxially arranged in sequence from top to bottom; the blue light ring light source is provided with a first coaxial observation hole; the red light ring light source is provided with a second coaxial observation hole. The utility model provides a detection system for surface cracks of frosted magnetic cores, which uses a blue light ring light source and a red light ring light source at high and low angles to illuminate the workpiece to be detected, so as to reduce the interference of the frosted background and highlight the crack defect, thereby improving the effect of crack defect imaging, and solving the problem of difficulty in detecting surface crack defects of frosted magnetic core products.

Description

Technical Field

[0001] The utility model relates to the technical field of machine vision detection, in particular to a detection system for surface cracks of frosted magnetic cores. Background Art

[0002] With the rapid progress of my country's automation technology, the market has increasingly stringent standards for the stability and yield of automation products. Especially in the field of surface crack defect detection of frosted magnetic core products, higher requirements are placed on the accuracy of crack detection.

[0003] The contrast and stability of crack defects have become key factors affecting the detection yield. However, in the existing technology, crack defect detection on the frosted surface of the magnetic core faces many challenges. When detecting cracks, traditional non-color (black and white) or color (monochrome) imaging methods are often strongly interfered by the frosted background, resulting in low defect contrast, difficulty in distinguishing from the background, or failure to clearly present crack defects, making it difficult to achieve stable detection of crack defects.

[0004] Therefore, how to solve this technical problem and improve the accuracy and stability of crack detection has become an urgent need in current research.

[0005] The above information is presented as background information only to assist with understanding the present disclosure and no determination or admission is made as to whether any of the above may be used as prior art with respect to the present disclosure. Utility Model Content

[0006] The utility model provides a system for detecting cracks on the surface of a frosted magnetic core, so as to solve the problems existing in the prior art.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A system for detecting cracks on the surface of a frosted magnetic core includes an image acquisition module, a blue light ring light source, and a red light ring light source; wherein:

[0009] The image acquisition module, the blue light ring light source and the red light ring light source are coaxially arranged in sequence from top to bottom;

[0010] The blue light annular light source is provided with a first coaxial observation hole;

[0011] The red light annular light source is provided with a second coaxial observation hole.

[0012] Furthermore, in the system for detecting cracks on the surface of the frosted magnetic core, along the axial direction of the second coaxial observation hole, the projection area of ​​the second coaxial observation hole is greater than or equal to the projection area of ​​the blue light ring light source.

[0013] Furthermore, in the system for detecting cracks on the surface of the frosted magnetic core, the image acquisition module includes a color camera and a telecentric lens.

[0014] Furthermore, in the system for detecting cracks on the surface of the frosted magnetic core, the brightness level of the blue light ring light source is 112 levels.

[0015] Furthermore, in the system for detecting cracks on the surface of the frosted magnetic core, the brightness level of the red light ring light source is 255 levels.

[0016] Furthermore, in the system for detecting cracks on the surface of the frosted magnetic core, the distance between the image acquisition module and the workpiece to be detected is 110±10 mm.

[0017] Furthermore, in the system for detecting cracks on the surface of the frosted magnetic core, the distance between the red light ring light source and the workpiece to be detected is 20±5 mm.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] The utility model provides a system for detecting cracks on the surface of frosted magnetic cores. By adopting high and low angle blue light ring light sources and red light ring light sources to illuminate the workpiece to be detected, the interference of frosted background can be reduced and the crack defects can be highlighted, thereby improving the effect of crack defect imaging and solving the problem of difficult crack defect detection on the surface of frosted magnetic core products.

[0020] The present invention has other characteristics and advantages, which will be apparent from the accompanying drawings and subsequent specific embodiments incorporated herein, or will be described in detail in the accompanying drawings and subsequent specific embodiments incorporated herein, which together are used to explain the specific principles of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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.

[0022] Figure 1 It is a schematic diagram of the structure (side view) of a frosted magnetic core surface crack detection system and a workpiece to be detected provided by an embodiment of the utility model;

[0023] Figure 2 It is a structural (stereoscopic) schematic diagram of a system for detecting surface cracks of a frosted magnetic core provided by an embodiment of the utility model;

[0024] Figure 3 It is a schematic diagram of the structure (side view) of a system for detecting cracks on the surface of a frosted magnetic core provided by an embodiment of the utility model;

[0025] Figure 4 It is a structural (stereoscopic) schematic diagram of a blue light ring light source and a red light ring light source provided by an embodiment of the utility model;

[0026] Figure 5 It is a schematic diagram of the structure (side view) of a blue light ring light source and a red light ring light source provided in an embodiment of the utility model.

[0027] Reference numerals:

[0028] Image acquisition module 1, blue light ring light source 2, red light ring light source 3, first coaxial observation hole 4, second coaxial observation hole 5, and workpiece to be detected 6. DETAILED DESCRIPTION

[0029] In order to explain in detail the possible application scenarios, technical principles, specific schemes that can be implemented, and the purposes and effects that can be achieved, the following is a detailed description of the specific embodiments listed in conjunction with the accompanying drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0030] Reference to "embodiment" herein means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The term "embodiment" appearing in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or association with other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, the various technical features mentioned in the embodiments can be combined in any way to form a corresponding implementable technical solution.

[0031] Unless otherwise defined, the technical terms used in this document have the same meanings as those generally understood by those skilled in the art to which this application belongs; the use of relevant terms in this document is only for describing specific embodiments and is not intended to limit this application.

[0032] In the description of this application, the term "and / or" is an expression used to describe the logical relationship between objects, indicating that three relationships may exist, for example, A and / or B, which means: A exists, B exists, and A and B exist at the same time. In addition, the character " / " in this article generally indicates that the objects before and after are in an "or" logical relationship.

[0033] In the present application, terms such as “first” and “second” are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship of quantity, priority or sequence between these entities or operations.

[0034] Without further limitations, in this application, the words "include", "comprises", "has" or other similar expressions used in the sentences are intended to cover non-exclusive inclusion. These expressions do not exclude the presence of additional elements in the process, method or product including the elements, so that the process, method or product including a series of elements may include not only those limited elements, but also other elements not explicitly listed, or also include elements inherent to such process, method or product.

[0035] Similar to the understanding in the Examination Guidelines, in this application, expressions such as "greater than", "less than", "exceed" and the like are understood to exclude the number itself; expressions such as "above", "below", "within" and the like are understood to include the number itself. In addition, in the description of the embodiments of this application, "multiple" means more than two (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups", "multiple times", etc., unless otherwise clearly and specifically limited.

[0036] In the description of the embodiments of the present application, space-related expressions used, such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or position relationship based on the orientation or position relationship shown in the specific embodiments or drawings, and are only for the convenience of describing the specific embodiments of the present application or facilitating the reader's understanding, and do not indicate or imply that the referred device or component must have a specific position, a specific orientation, or be constructed or operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0037] Unless otherwise expressly specified or limited, in the description of the embodiments of the present application, the terms such as "install", "connect", "connect", "fix", "set", etc. used should be understood in a broad sense. For example, the "connection" can be a fixed connection, a detachable connection, or an integrated setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For technicians in the technical field to which the present application belongs, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0038] In view of the above-mentioned defects in the prior art, the applicant, based on many years of rich practical experience and professional knowledge in design and manufacturing in this field, and in conjunction with the application of theory, actively conducts research and innovation in the hope of creating a technology that can solve the defects in the prior art. After continuous research and design, and after repeated trial production and improvement, the present utility model with real practical value was finally created.

[0039] Please refer to Figure 1-5 The embodiment of the utility model provides a system for detecting cracks on the surface of a frosted magnetic core, which mainly includes an image acquisition module 1, a blue light ring light source 2, and a red light ring light source 3. These components are coaxially arranged in sequence from top to bottom to ensure that the light source is aligned with the image acquisition module 1 to achieve accurate crack detection.

[0040] The blue light ring light source 2 is designed with a first coaxial observation hole 4, while the red light ring light source 3 is equipped with a second coaxial observation hole 5. Such a design enables the light source to evenly illuminate the surface of the workpiece 6 to be inspected, while allowing the image acquisition module 1 to capture a clear image through the observation hole.

[0041] It should be noted that, since there is a certain amount of height difference information when the surface of the frosted magnetic core product is broken, there are continuous height difference changes on the plane and the crack. The present embodiment breaks the conventional practice of using monochromatic light (color) to detect surface cracks on the frosted magnetic core, and chooses to use a combination of red and blue light at high and low angles (i.e., a blue light ring light source 2 and a red light ring light source 3) to illuminate the workpiece 6 to be inspected. The difference in wavelengths of red and blue light has a certain weakening effect on the frosted background. At the same time, the image acquisition module 1 is used to make the plane appear pink and the crack appear black, which is conducive to reducing background interference, improving the contrast of crack defects, and achieving the effect of highlighting crack defects, thereby solving the problem of difficult detection of crack defects on the surface of frosted magnetic core products.

[0042] In this embodiment, along the axial direction of the second coaxial observation hole 5, the projection area of ​​the second coaxial observation hole 5 is designed to be greater than or equal to the projection area of ​​the blue light ring light source 2. This design has the following advantages:

[0043] First, the larger projection area of ​​the second coaxial observation hole 5 means a wider field of view and higher light flux, enabling the image acquisition module 1 to capture richer details and clearer images. This is crucial for the detection of crack defects, because clearer images help to more accurately identify the shape, size and location of the crack.

[0044] Secondly, by increasing the projection area of ​​the second coaxial observation hole 5, the coverage and uniformity of the blue light on the surface of the workpiece to be inspected can be increased, thereby more effectively reducing background interference and improving the contrast of crack defects.

[0045] In this embodiment, the image acquisition module 1 is further optimized and improved. Specifically, the module includes a color camera and a telecentric lens.

[0046] The use of color cameras enables the system to capture color images of the surface of the magnetic core to be inspected, which provides richer information for the detection of crack defects. Compared with traditional black and white cameras, color cameras can more accurately present the color, shape, texture and other characteristics of cracks, thereby improving the accuracy of crack detection.

[0047] At the same time, the use of telecentric lens is also a highlight of this embodiment. Telecentric lens has unique imaging characteristics, which can provide nearly parallel light within the working distance, thereby reducing image distortion caused by changes in object distance. This feature is particularly important in crack detection, because cracks on the surface of the magnetic core may have different depths and shapes. The telecentric lens can ensure that no matter where the crack is, its image can remain clear and consistent, thereby improving the stability of detection.

[0048] In summary, by adopting a color camera and a telecentric lens, the image acquisition module 1 in this embodiment can not only provide richer and more accurate crack image information, but also ensure the clarity and consistency of the image, thereby further improving the overall performance of the frosted magnetic core surface crack detection system.

[0049] In this embodiment, the brightness levels of the blue ring light source 2 and the red ring light source 3 are respectively set to 112 and 255. This design is based on the special requirements for core surface crack detection and a deep understanding of light source characteristics.

[0050] The brightness level of the blue light ring light source 2 is set to 112, mainly to ensure sufficient lighting intensity while avoiding interference of excessive blue light to the image acquisition module. Appropriate blue light brightness helps to highlight the crack features on the surface of the magnetic core, while not making the background too bright, thereby ensuring a good contrast between the crack and the background.

[0051] The brightness level of the red light ring light source 3 is set to 255 levels in order to make full use of the characteristics of red light to enhance the effect of crack detection. Red light has a significant effect in reducing the interference of frosted background. High-brightness red light can better highlight cracks and make them more obvious in the image. In addition, by adjusting the brightness level of red light, the contrast between cracks and background can be further optimized to improve the accuracy of detection.

[0052] In summary, by setting different brightness levels, the blue light ring light source 2 and the red light ring light source 3 in this embodiment can work together to achieve efficient and accurate detection of cracks on the surface of the magnetic core. This design not only improves the sensitivity and stability of the detection, but also helps to reduce the risk of false detection and missed detection, and improve the detection yield.

[0053] Please refer again Figure 1 In this embodiment, the distance between the image acquisition module 1 and the red light ring light source 3 and the workpiece 6 to be detected is precisely controlled. This distance adjustment is crucial to ensure the accuracy and stability of crack detection.

[0054] First, the distance between the image acquisition module 1 and the workpiece 6 to be inspected is set to 110±10 mm. This distance setting takes into account the imaging characteristics of the image acquisition module 1 and the size of the workpiece to be inspected. By maintaining an appropriate distance, the image acquisition module 1 can capture clear and accurate crack images, avoiding image blur or distortion caused by being too close or too far away.

[0055] Secondly, the distance between the red light ring light source 3 and the workpiece 6 to be inspected is set to 20±5mm. This distance is set to ensure that the red light and blue light can be evenly and fully irradiated on the surface of the workpiece 6 to be inspected, thereby highlighting the crack characteristics. The appropriate light source distance helps to improve the contrast between the crack and the background, making the crack more obvious in the image.

[0056] By precisely controlling these two distances, the detection system in this embodiment can maximize the crack features while ensuring image clarity, thereby improving the accuracy of crack detection. This design not only optimizes the performance of the detection system, but also helps to improve detection efficiency and reduce the risk of false detection and missed detection.

[0057] It should be noted that, in actual applications, the settings of these distances may be fine-tuned according to specific detection requirements and the characteristics of the workpiece 6 to be detected. Therefore, in actual operation, appropriate adjustments should be made according to actual conditions to ensure the best performance of the detection system.

[0058] Although the terms such as image acquisition module, blue light ring light source, red light ring light source, and first coaxial observation hole are used more frequently in this application, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

[0059] The utility model provides a system for detecting cracks on the surface of frosted magnetic cores. By adopting high and low angle blue light ring light sources and red light ring light sources to illuminate the workpiece to be detected, the interference of frosted background can be reduced and the crack defects can be highlighted, thereby improving the effect of crack defect imaging and solving the problem of difficult crack defect detection on the surface of frosted magnetic core products.

[0060] Finally, it should be noted that although the above embodiments have been described in the specification and drawings of this application, this does not limit the scope of patent protection of this application. All technical solutions generated by replacing or modifying equivalent structures or equivalent processes based on the essential concept of this application using the contents recorded in the specification and drawings of this application, as well as directly or indirectly implementing the technical solutions of the above embodiments in other related technical fields, are included in the scope of patent protection of this application.

Claims

1. A system for detecting cracks on the surface of a frosted magnetic core, characterized in that: It comprises an image acquisition module (1), a blue light ring light source (2) and a red light ring light source (3); wherein: The image acquisition module (1), the blue light annular light source (2) and the red light annular light source (3) are coaxially arranged in sequence from top to bottom; The blue light annular light source (2) is provided with a first coaxial observation hole (4); The red light annular light source (3) is provided with a second coaxial observation hole (5).

2. The system for detecting surface cracks of frosted magnetic cores according to claim 1, characterized in that: Along the axial direction of the second coaxial observation hole (5), the projection area of ​​the second coaxial observation hole (5) is greater than or equal to the projection area of ​​the blue light annular light source (2).

3. The system for detecting surface cracks of frosted magnetic cores according to claim 1, characterized in that: The image acquisition module (1) comprises a color camera and a telecentric lens.

4. The system for detecting surface cracks of frosted magnetic cores according to claim 1, characterized in that: The brightness level of the blue light ring light source (2) is 112 levels.

5. The system for detecting surface cracks of frosted magnetic cores according to claim 1, characterized in that: The brightness level of the red light ring light source (3) is 255 levels.

6. The system for detecting surface cracks of frosted magnetic cores according to claim 1, characterized in that: The distance between the image acquisition module (1) and the workpiece to be detected is 110±10 mm.

7. The system for detecting surface cracks of frosted magnetic cores according to claim 1, characterized in that: The distance between the red light annular light source (3) and the workpiece to be detected is 20±5 mm.

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