JP2518967Y2 - Imaging device for defect inspection of inner wall surface of cylinder - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inspection device for automatically inspecting the inner wall surface of the cylindrical hole of various works for defects.

[0002]

2. Description of the Related Art There are various apparatuses for automatically inspecting the inner wall surface of a cylindrical hole such as a bore of a cylinder block for defects. Basically, a small imaging device is inserted into the cylindrical hole and The inner wall surface is imaged, 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.
The imaging camera (2) is attached to the center of the upper part of the main body case (1), and the scope (3) having a plurality of lenses is vertically installed in the imaging camera (2). The cone mirror (4) and the reflector (5) are attached, a large number of optical fibers (6) are installed on the inner circumference of the main body case (1), and the lower end of the optical fiber (6) faces the lower end of the main body case (1). is there. The upper end of the optical fiber (6) is connected to a lighting device (not shown).

In the image pickup device, the main body case (1) is inserted into the bore (7), and the bore (7) is connected to the optical fiber (6).
The inside is illuminated and the light reflected by the inner wall surface (8) of the bore (7) is guided to the scope (3) by the cone mirror (4) and 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, the control is easy, the inspection speed can be increased, and the reliability is high.

[0005]

In order to make an accurate determination in 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 applied to the inner wall surface (8) of the bore (7). In addition, the angle of the tip of the optical fiber (6) is adjusted. Therefore, for a bore with a diameter larger than the preset bore diameter, the distance from the optical fiber (6) becomes long and 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), so that the image becomes dark and accurate determination cannot be performed.

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

The present invention is intended to provide an image pickup apparatus capable of picking up an image of the inner wall surface of a plurality of types of cylindrical holes having different diameters with a single image pickup device.

[0009]

The image pickup device of the present invention comprises:
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 cone-shaped cone mirror and a reflector are attached to the center of the lower part of the scope, along the inner circumference of the body case. A large number of optical fibers are installed, and the lower end of the optical fiber faces the lower end of the main body case. In the imaging device, a cylindrical reflection cover is axially slidably mounted on the lower outer periphery of the main body case.

[0010]

In the above image pickup device, the mounting position of the optical fiber is aligned with the cylindrical hole having the largest diameter to be measured, and when the cylindrical hole having a smaller diameter is imaged, the reflecting cover is slid downward from the main body case. Use by protruding. By doing this, when imaging a small-diameter cylindrical hole, part of the light emitted from the optical fiber is reflected by the reflective cover,
Further, since it is reflected by the reflection plate and hits the inner wall surface of the cylindrical hole, a bright image can be obtained.

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

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 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 image pickup 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 a body case (1).
It is mounted 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 body case (1), it reflects the outer light of the light from the optical fiber (6), and the conical reflector (5) installed below the scope (3). ), 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 maximum diameter to be inspected.

When inspecting a bore having a diameter smaller than a preset bore, the image pickup apparatus having the above-mentioned structure projects the reflection cover (10) from the main body case (1) to take an image. By doing so, 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 reflected from the reflecting plate (5) to the inner wall surface (8). It is reflected toward and irradiates 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.

When the bore (7) having a large diameter is inspected, the reflection cover (10) is retracted onto the main body case (1) as shown in FIG. 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.
Can perform accurate inspection.

[0018]

According to the present invention, the reflection cover slidably attached to the main body case is slid to project or retract from the main body case in accordance with the diameter of the cylindrical hole to be inspected, so that a single device is provided. Therefore, it is possible to inspect the inner wall surfaces of multiple types of cylindrical holes, simplify equipment, and greatly improve 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 sectional view showing a problem of the conventional imaging device.

[Explanation of symbols] 1 main body case 3 scope 4 cone mirror 5 reflector 6 optical fiber 10 reflector cover

Claims (1)

(57) [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 reflection plate 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 image pickup apparatus for inspecting a defect on an inner wall surface of a cylinder.