JP3075273U - Cylinder inner surface inspection device - Google Patents

Abstract

(57) [abstract] (with correction) [Problem] An image pickup device using a linear CCD device is used to image a defect such as a scratch or a pinhole on a cylindrical inner surface such as an engine cylinder or an oil cylinder of a motorbike. An apparatus for detecting by image processing is provided. A gantry (2) having a movable mechanism inside a cylinder (1).
Is inserted, and the light source light is refracted and reflected by the mirror 9 from the linear light guide.
0 is obliquely illuminated, receives reflected light from the surface to be measured, reflects and refracts the light, guides it to the linear CCD camera 4, converts the image, and sharpens the scratches and pinholes on the surface to be measured by image processing. The device to identify.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the present invention pertains] A device for imaging a defect such as a cylindrical internal surface such as an engine cylinder or an oil cylinder of a motorbike or a defect such as a pinhole with an imaging device using a linear CCD element and detecting the image by image processing. .

[0002]

2. Description of the Related Art Conventionally, a light source light mirror indicated by 8 in FIG.
The mirror for light source light indicated by 9 was disposed in contact with the mirror for light reception indicated by 9 or the light source light was applied almost perpendicularly to the inner surface of the cylinder by almost the same means. Therefore, the detection sensitivity of scratches and pinholes was not high.

[0003]

[Means to be Solved by the Invention] In order to increase the detection sensitivity of scratches and pinholes, FIG.
As shown in (1), a light source light mirror 8 is newly provided, and the light source light is directed obliquely to the inner surface of the cylinder to improve the detection sensitivity.

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows the entire configuration of the main part of this apparatus. In FIG. 1, reference numeral 1 denotes a cylinder to be measured, and 100 denotes an inner surface of a cylinder. Reference numeral 2 denotes an optical system mounting base, and reference numeral 3 denotes a mechanism for rotating the cylinder in the circumferential direction and moving the cylinder axis up and down. Reference numeral 200 denotes a rotation axis of 3. 4 is a linear CCD camera unit, 5 is a lens system unit, 6 is a first mirror for light source light, which is arranged at approximately 45 °, and 7 is a second mirror for light source light, which is also mounted at 45 °. Reference numeral 8 denotes a third light source mirror, which is attached at an angle of 30 to 35 degrees with respect to a perpendicular to the inner surface of the cylinder. Reference numeral 9 denotes a light receiving mirror mounted at 45 ° to the reflected optical axis. FIG. 2 schematically shows the path of the light from the light source, where 10 is a linear light guide, and 200 is the traveling direction of the incident light. FIG. 3 schematically shows the path of light reflected from the inner surface 100 of the cylinder. In the figure, 300 indicates the traveling direction of the reflected light, and 11 indicates a CCD camera light receiving unit. FIG. 4 shows a cross-sectional view taken along line A-A 'of FIG. 1 and the positional relationship between the linear light guide 10 and the CCD camera 4. As shown in FIG.

[0005]

[Action]

 The operation will be described with reference to the embodiment shown in FIGS. In FIG. 1, the rotation axis 200 of the gantry 2 and the axis of the measuring cylinder are arranged concentrically, and the gantry is axially movable by the mechanism 3 so as to cover from the inner bottom to the edge of the cylinder. And the gantry can rotate 360 ° about the axis. Actually, for example, the cylinder inner surface is divided into 35 mm heights, and one round is taken, and this operation is sequentially repeated to inspect the entire cylinder inner surface. The light source light emitted from the linear light guide 10 is bent by the first light source light mirror 6 and reaches the second light source light mirror 7. Here, the light is further bent by 90 ° and reaches the third mirror 8 for light source light. As shown in FIG. 4, the light is further bent at 8 and is incident on the perpendicular of the inner surface 100 at an incident angle of 60 to 70 °. The light reflected on the inner surface 100 of the cylinder is bent 90 ° by the nine light receiving mirrors, and reaches the CCD camera 4 through the lens system section 5 via a path indicated by 300 in FIG. After that, scratches and pinholes are displayed as images by image processing.

[0006]

[Effect of the invention]

 By irradiating the inner surface of the cylinder to be inspected with light obliquely, the contour images of flaws and pinholes can be obtained much more clearly than in the past. In addition, even if the inner diameter of the cylinder is small, a device that can easily detect a flaw or a pinhole can be configured by reducing the size of the mirror.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a main part of a cylinder inner surface inspection apparatus.

FIG. 2 is a schematic view of a light source light path.

FIG. 3 is a schematic view of the path of reflected light.

FIG. 4 is a sectional view taken along line AA ′ of FIG.
CD camera layout

[Explanation of symbols]

 1 ··· Measurement cylinder 2 ··· Base 3 ··· Mechanical unit 4 ··· CCD camera 5 ··· Lens system unit 6 ··· First light source light mirror 7 ···・ Light source light second mirror 8 ・ ・ ・ ・ Light source light third mirror 9 ・ ・ ・ ・ Light receiving mirror 10 ・ ・ ・ Linear light guide 11 ・ ・ ・ CCD camera light receiving part 100 ・ ・ Cylinder inner surface 200 ・ ・ Light source light Traveling direction 300 ・ ・ Progressing direction of reflected light

Claims (2)

[Utility model registration claims] 1. A linear light guide 10 and light source light mirrors 6, 7, 8 are disposed on two frames having a movable mechanism, light is obliquely applied to the inner surface of a cylinder, and reflected light is received by a light receiving mirror 9, The image is taken by the lens system 5 and the linear CCD camera 4,
Image processing device. 2. The apparatus according to claim 1, wherein the angle of light hitting the inner surface of the cylinder is 60 to 70 ° with respect to a perpendicular to the inner surface.