JPH0519951U - Imaging device for defect inspection of inner wall surface of cylinder - Google Patents

Abstract

(57) [Summary] [Object] To provide an imaging device capable of reliably imaging the inner wall surface of various cylindrical holes having different diameters to the end. [Arrangement] An imaging camera is attached to the center of the upper part of a cylindrical body case, a scope is vertically installed on the imaging camera, and a conical cone mirror and a reflector are attached to the center of the lower part of the scope. An imaging device in which a large number of optical fibers are installed along the circumference and the lower end of the optical fiber faces the lower end of the main body case, and a cylindrical reflection cover is axially slidably mounted on the lower outer circumference of the main body case. Is.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an inspection device for automatically inspecting defects on the inner wall surface of a cylindrical hole of various works.

[0002]

[Prior Art]

 There are various devices that automatically inspect for defects on the inner wall surface of a cylindrical hole such as the bore of a cylinder block. Basically, a small imaging device is inserted into the cylindrical hole to image the inner wall surface. Then, the obtained image signal is subjected to image processing by an image processing device, and the presence or absence of a defect is automatically determined from the processing result.

As the image pickup device, as shown in FIG. 3, a scope (3) in which an image pickup camera (2) is attached to an upper center portion of a main body case (1) and a plurality of lenses are built in the image pickup camera (2) ) Is vertically installed, a cone-shaped cone mirror (4) and a reflector (5) are attached to the lower center of the scope (3), and a large number of optical fibers (6) are installed on the inner circumference of the main body case (1). The lower end of the optical fiber (6) faces the lower end of the main body case (1). The upper end of the optical fiber (6) is connected to a lighting device (not shown).

In the imaging device, the main body case (1) is inserted into the bore (7), the inside of the bore (7) is illuminated by the optical fiber (6), and the light is reflected by the inner wall surface (8) of the bore (7). The light is guided to the scope (3) by the cone mirror (4) and is imaged by the imaging camera (2). The image pickup camera (2) transmits the image signal to the image processing device. Since the imaging device can image the entire circumference of the bore (7) at a time, it is not necessary to rotate the imaging device, control is facilitated, inspection speed can be increased, and reliability is high.

[0005]

[Problems to be solved by the device]

 In order to make an accurate determination with the above-mentioned image pickup device, it is necessary to obtain a bright image, and sufficient reflected light must reach the image pickup camera (2). In this case, the problem is that the light from the optical fiber (6) escapes to the outside of the bore (7) near the end of the bore (7), and the reflected light does not reach the imaging camera (2) sufficiently. This is because the image becomes dark.

Therefore, conventionally, as shown in FIG. 4, when the end portion of the bore (7) is imaged, the light emitted from the optical fiber (6) is sufficiently directed to the inner wall surface (8) of the bore (7). The angle of the tip of the optical fiber (6) is adjusted so as to correspond to the above. Therefore, for a bore with a diameter larger than the preset bore diameter, the distance from the optical fiber (6) becomes long and the light does not reach sufficiently, and for a bore with a narrow diameter, As shown in FIG. 5, a part of the light emitted from the optical fiber (6) escapes to the outside of the bore (7), and the image becomes dark so that an accurate judgment cannot be made.

Therefore, when inspecting a plurality of types of bores having different diameters, dedicated imaging devices are required for the respective types.

The present invention is intended to provide an imaging device capable of imaging the inner wall surfaces of a plurality of types of cylindrical holes having different diameters with a single imaging device.

[0009]

[Means for Solving the Problems]

 In the image pickup device of this invention, an image pickup camera is attached to the upper center part of a cylindrical body case, a scope is hung vertically on the image pickup camera, and a conical cone mirror and a reflection plate are attached to the lower center of the scope. In an imaging device in which a large number of optical fibers are installed along the inner circumference of the main body case and the lower end of the optical fiber faces the lower end of the main body case, a cylindrical reflection cover is axially provided on the lower outer circumference of the main body case. It is mounted so that it can slide.

[0010]

[Action]

 In the above imaging device, the mounting position of the optical fiber is aligned with the cylindrical hole of the maximum diameter to be measured, and when imaging a cylindrical hole of a smaller diameter, the reflective cover is slid to project downward from the main body case. Let me use it. By doing this, when capturing an image of a small-diameter cylindrical hole, part of the light emitted from the optical fiber is reflected by the reflection cover and then by the reflection plate to hit the inner wall surface of the cylindrical hole, resulting in a bright image. can get.

Therefore, by simply sliding the reflection cover, it is possible to inspect for defects in the inner wall surface of the cylindrical holes of various diameters.

[0012]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. However, the same components as those of the conventional technique are designated by the same reference numerals and the description thereof will be omitted.

As shown in FIG. 1, the imaging device used in the inspection device for inspecting the inner wall surface of the cylindrical hole has a cylindrical reflection cover (10) attached to the outer periphery of the lower portion of the main body case (1).

The reflection cover (10) is attached to the main body case (1) so as to be slidable in the axial direction, and can be made to project from the lower end of the main body case (1) by a predetermined size. When the reflective cover (10) protrudes from the main body case (1), it reflects the outer light of the light from the optical fiber (6), and a conical reflector () installed below the scope (3). 5), and further from the reflector (5) to the inner wall surface (8) of the bore (7).

The mounting angle of the lower end of the optical fiber (6) is set to an angle such that the vicinity of the upper end of the inner wall surface can be directly irradiated to the bore having the largest diameter to be inspected.

When inspecting a bore having a diameter smaller than a preset bore, the image pickup apparatus having the above-mentioned configuration projects the reflection cover (10) from the main body case (1) to take an image. In this way, the light not directly hitting the inner wall surface from the optical fiber (6) is reflected by the reflecting cover (10) toward the reflecting plate (5), and further, from the reflecting plate (5) to the inner wall surface (8). To irradiate the inner wall surface (8). Then, the light reflected from the inner wall surface (8) is guided to the scope (3) by the cone mirror (4) and is imaged by the imaging camera (2). Therefore, the vicinity of the upper end of the bore (7) can be effectively illuminated and a bright image can be obtained, so that an accurate inspection can be performed.

Further, when inspecting the bore (7) having a large diameter, as shown in FIG. 2, the reflection cover (10) is retracted onto the main body case (1) and imaging is performed. In this case, since the light from the optical fiber (6) directly illuminates the inner wall surface (8) of the bore (7), a bright image can be obtained and an accurate inspection can be performed.

[0018]

[Effect of the device]

 According to this invention, by sliding the reflection cover slidably attached to the main body case and projecting or retracting it from the main body case according to the diameter of the cylindrical hole to be inspected, it is possible to use multiple devices with one device. The inner wall surface of the seed hole can be inspected, which simplifies the equipment and greatly improves the workability.

[Brief description of drawings]

FIG. 1 is a sectional view showing a main part of an image pickup apparatus according to the present invention.

FIG. 2 is a sectional view of an essential part showing an operation example of the image pickup device of the present invention.

FIG. 3 is a schematic configuration diagram of a conventional imaging device.

FIG. 4 is a sectional view showing an irradiation range of a conventional imaging device.

FIG. 5 is a cross-sectional view showing a problem of the conventional imaging device.

[Explanation of symbols]

 1 Body case 3 Scope 4 Cone mirror 5 Reflector 6 Optical fiber 10 Reflective cover

Claims (1)

[Scope of utility model registration request] 1. An imaging camera is attached to a central portion of an upper portion of a cylindrical main body case, a scope is vertically provided on the imaging camera, and a conical cone mirror and a reflector are attached to a lower center of the scope. In an imaging device in which a large number of optical fibers are installed along the inner periphery of the main body case and the lower end of the optical fiber faces the lower end of the main body case, a cylindrical reflective cover is axially slidably mounted on the lower outer periphery of the main body case. An imaging device for inspecting a defect on the inner wall surface of a cylinder.