Cable automatic focusing defect detection device based on fixed focal length lens

Abstract

The utility model provides a cable automatic focusing defect detection device based on a fixed focal length lens, which belongs to the field of cable surface defect detection, and adopts double-side semicircular annular light for symmetrical lighting and a high-resolution industrial camera for 360-degree surrounding shooting, and the industrial camera adopts the fixed focal length lens, so that the defect detection efficiency is improved. A metal ring with a gear structure on the outer side face is wound on an industrial lens focusing ring, a metal cylindrical structure is arranged on the side face of an industrial camera lens, the metal ring with the same gear structure as the industrial lens is installed on the head of the structure, and the other side of the structure is controlled by a small motor to rotate, so that the purpose of automatic focusing is achieved. The structure can realize automatic focusing of the industrial camera, thereby solving the problem that the depth of field of a fixed focal length lens is not enough due to large fluctuation of the diameter of a middle-high voltage cable, and effectively reducing the cost of the industrial lens.

Description

Technical Field

[0001] The utility model relates to the field of cable surface defect detection, in particular to a cable automatic focusing defect detection device based on a fixed focal length lens. Background Art

[0002] The diameters of medium- and high-voltage cables vary widely, from a dozen millimeters to nearly 200 millimeters. Even within the same production line, multiple cables of varying diameters can be produced. Commonly used industrial camera lenses, with a maximum depth of field of around 10mm, struggle to accommodate such a wide range of cable diameters.

[0003] Currently, there are two main types of electric autofocus industrial lenses on the market: one with a built-in electric focus mechanism and the other a liquid lens that automatically adjusts focus by adjusting the focal length. Both of these autofocus lenses are significantly more expensive than fixed-focal-length industrial lenses, driving up the cost of intelligent inspection equipment. The cable industry, a traditional manufacturing industry with low profits, is therefore sensitive to the cost of intelligent inspection equipment. Utility Model Content

[0004] In response to the above problems in the design process of the optical system of cable intelligent detection equipment, the utility model provides a 360-degree defect detection device for cables based on a fixed focal length lens and an automatic focusing mechanism.

[0005] The technical solution of the utility model is:

[0006] A cable automatic focusing defect detection device based on a fixed focal length lens comprises a lighting device, an imaging device and a shading device; wherein

[0007] Lighting device, using different types of light sources for lighting according to the characteristics of different cable production processes;

[0008] The imaging device uses an industrial camera to shoot 360 degrees around the cable, with a fixed object distance and an industrial lens with a fixed focal length;

[0009] The shading device is a shell for shading that is deployed outside the imaging device and the lighting device.

[0010] Further,

[0011] The shading device is divided into two upper and lower shells, one end of the two shells is hinged together, so that the shading device can be opened and closed.

[0012] The lighting device includes a light source fixing structure, which is a structure for installing and fixing a semicircular LED ring light source. The light source fixing structure is divided into four parts, each used to fix four semicircular LED ring light sources. Every two semicircular LED ring light sources form a ring, which are respectively arranged inside the upper and lower shells of the shading device.

[0013] Further,

[0014] The industrial lens is equipped with an automatic focusing mechanism, which drives the focus ring of the industrial camera to rotate to achieve the purpose of automatic focusing.

[0015] The automatic focusing mechanism includes a focusing ring rotating device and a driving motor. The focusing ring rotating device is arranged on the focusing ring of the industrial camera. The driving motor drives the focusing ring rotating device to rotate, thereby driving the focusing ring of the industrial camera to rotate.

[0016] Going further,

[0017] The focus ring rotating device is a ring gear, which is meshed with a driving gear on the driving motor that outputs power.

[0018] Further,

[0019] Structural components for installing industrial cameras and industrial light sources are arranged inside the shading device, and are used to install industrial cameras and light sources.

[0020] A bottom bracket is provided outside the shell of the shading device, and a servo motor is used to form an overall structure that can drive the shading shell to automatically rise and fall.

[0021] The beneficial effects of the utility model are

[0022] (1) The automatic focusing mechanism based on the fixed focal length industrial lens designed in the present invention has a lower cost than the automatic focusing industrial lens on the market, and can effectively reduce the overall hardware cost of industrial quality inspection equipment.

[0023] (2) The automatic focusing mechanism of the industrial lens based on fixed focal length designed by the utility model can effectively reduce due to its simple mechanical structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of each part of the utility model;

[0025] Figure 2 1. It is a schematic diagram of the lighting device structure;

[0026] Figure 3 This is a schematic diagram of the automatic focusing principle;

[0027] Figure 4 Schematic diagram of the automatic focusing structure;

[0028] Figure 5 This is a schematic diagram of the installation position of the automatic focusing structure;

[0029] Figure 6 It is a schematic diagram of the overall external structure of the utility model;

[0030] Figure 7 It is a schematic diagram of the overall layout of the head imaging device and light source device. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0032] Aiming at the problems of large wire diameter variation in the production process of medium and high voltage cables and high cost of using automatic zoom lenses, the utility model designs a cable defect detection device based on automatic focusing of fixed focal length lenses to realize 360-degree surround defect detection of medium and high voltage cables.

[0033] The utility model relates to a defect detection device for cable production, which realizes automatic focusing based on a fixed-focus industrial lens. The device consists of a lighting device 1, an imaging device 2 and a shading device 3.

[0034] Different types of light sources have very different structures. In the present invention, different types of light sources are needed to meet the optical characteristics of different materials on the cable surface. This embodiment uses a semicircular LED ring light source for lighting for the detection of surface defects of cable sheaths. The lighting device 1 includes a light source fixing structure 11. The light source support frame is a structure for installing and fixing the semicircular LED ring light source. It is divided into 4 parts, which are used to fix 4 semicircular LED ring light sources respectively. Each 2 semicircular LED ring light sources form a ring, which is arranged on one side of the inner part of the light-shielding shell.

[0035] The imaging device is composed of an industrial camera 21, an industrial lens 22, and an industrial lens automatic focusing mechanism 23. The specific implementation scheme of the utility model, the industrial lens automatic focusing mechanism, is composed of an industrial lens focus ring rotating device 231, a linkage rod 232, and a drive motor 233. The industrial lens focus ring rotating device 231 is a circular ring structure made of a metal ring, and the outer surface of the ring is processed into a gear-like structure. The linkage rod 232 is a cylindrical steel structure. One end is processed into a gear structure that adapts to the gear on one side of the industrial lens. The other side is connected to a small drive motor 233. The drive motor drives the linkage rod to rotate, thereby driving the industrial camera focus ring to rotate, achieving the purpose of automatic focusing.

[0036] The motor-driven focus adjustment requires minimal rotation. First, the rotation range of the focus ring on industrial lenses is limited. Excessive rotation can damage the ring. Second, excessive rotation can affect focus accuracy, making it difficult to achieve sharp focus. For these reasons, this implementation utilizes a smaller diameter for the linkage gear than the focus ring on industrial lenses to achieve a better reduction ratio, reduce the rotation range during autofocus, and achieve better focusing results.

[0037] The light shielding device 3 is a light-shielding housing positioned outside the lighting and imaging devices. The housing can be fabricated from sheet metal or aluminum profiles. The lighting and imaging devices are mounted within the light shielding device via structural components. The light shielding device primarily prevents ambient light from affecting the industrial camera's imaging, thereby improving image quality.

[0038] The above description is merely a preferred embodiment of the present invention and is intended only to illustrate the technical solution of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention are included in the scope of protection of the present invention.

Claims

1. A cable automatic focusing defect detection device based on a fixed focal length lens, characterized in that: It includes a lighting device, an imaging device and a light shielding device; in Lighting device, using different types of light sources for lighting according to the characteristics of different cable production processes; The imaging device uses an industrial camera to shoot 360 degrees around the cable, with a fixed object distance and an industrial lens with a fixed focal length; The shading device is a shell deployed outside the imaging device and the lighting device for shading.

2. The device according to claim 1, characterized in that The shading device is divided into two upper and lower shells, one end of the two shells is hinged together, so that the shading device can be opened and closed.

3. The device according to claim 2, characterized in that The lighting device includes a light source fixing structure, which is a structure for installing and fixing a semicircular LED ring light source. The light source fixing structure is divided into four parts, each used to fix four semicircular LED ring light sources. Every two semicircular LED ring light sources form a ring, which are respectively arranged inside the upper and lower shells of the shading device.

4. The device according to claim 2 or 3, characterized in that The industrial lens is provided with an automatic focusing mechanism, thereby driving the focus ring of the industrial camera to rotate, thereby achieving the purpose of automatic focusing.

5. The device according to claim 4, characterized in that The automatic focusing mechanism includes a focusing ring rotating device and a driving motor. The focusing ring rotating device is arranged on the focusing ring of the industrial camera. The driving motor drives the focusing ring rotating device to rotate, thereby driving the focusing ring of the industrial camera to rotate.

6. The device according to claim 5, characterized in that The focus ring rotating device is a ring gear, which is meshed with a driving gear on the driving motor that outputs power.

7. The device according to claim 2, characterized in that Structural components for mounting an industrial camera and an industrial light source are arranged inside the shading device, and are used to mount the industrial camera and the light source.

8. The device according to claim 2, characterized in that A bottom bracket is provided on the outside of the shell of the shading device, and a servo motor is used to form an overall structure that can drive the shading shell to automatically rise and fall.

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