JP2521124Y2 - Photographing device for steel plate upper surface - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for clearly photographing a blister (blister defect) on the upper surface of a steel plate.

[0002]

2. Description of the Related Art For example, for a steel material used for pipelines, a hydrogen-induced cracking test (a polishing-finished steel sheet for a sample is immersed in seawater bubbling with hydrogen sulfide for 5 to 7 days).
It is necessary to immerse the plate in the sun and perform a blister (blister defect) shown in FIG. 3 on the upper surface of the steel plate, and photograph the blister generated on the upper surface of the steel plate for a sample.

The photograph of this steel plate upper surface blister is
There are a method of shooting with a camera in the shade without using artificial light, and a method of shooting with a camera by irradiating artificial light uniformly from two or four directions of a steel plate for a sample in a photo studio.

[0004]

However, the upper surface of the steel plate is mirror-finished by polishing and the size of the blister is very small, about 0.1 to 3 mm. In this case, because the illuminance on the top surface of the steel plate or the incident angle of light varies depending on the weather and the position of the sun, it is very difficult to determine the shooting conditions of the camera for photography,
Requires skill. In addition, in the case of (1), it is necessary to shoot light by shining light from various angles in the photo studio, which is a large-scale device and requires the same skill as the above.

It is an object of the present invention to clearly photograph a blister on a mirror-finished steel plate upper surface without halation without requiring skill as described above and by a simple operation. It is what

[0006]

The present invention has been made to solve the above-mentioned problems, and the means is to provide a camera for photographing in the upper part of a box as a photographing room which shields external light. A light- scattering glass window is provided on a side portion of the photographing room, and further below the photographing camera, and
The frame for mounting a sample steel plate in the horizontal direction in the position of the light diffuser window pane provided, between the frame and the light diffuser window pane, the shielding member an upper surface and an upper surface at the same level position of the specimen steel plate the rod-shaped body is provided as the provided illumination lights to the outside of the diffuser glass window, said diffuser light from the light in parallel to incident along the specimen steel plate top surface through said diffuser for glass <br/> Las window A reflecting mirror that reflects obliquely upward on the glass window side for use is provided, and a reflecting mirror that obliquely irradiates the reflected light from the reflecting mirror onto the upper surface of the steel plate for a sample is provided.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. First, the configuration of this example will be described. In the figure, reference numeral 1 denotes a set hole 3 in which a lens R of a camera 2 for photography (hereinafter simply referred to as a camera) is inserted in the upper portion, and a frosted glass 5 for taking in light from an illumination light 4 at a side portion. br /> the glass window 6 ground is a diffuser for a glass window that crowded because fitting, anti
A box having an opening / closing door 7 on the side of the ground glass window 6, 8 is a pedestal on which three sample steel plates 9 are placed, 10 is a surface between the frosted glass window 6 and the gantry 8, and the upper surface of the steel plate 9 for samples is Round bar as a shielding member arranged at the same position as the upper surface level, 11
Reflectors provided between the door 7 throat specimen steel plates 9 (anti frosted glass window 6 side of the specimen steel plates 9), 12 round bar 10
Between the window and the frosted glass window 6 (with respect to the steel plate 9 for the previous sample)
This is a reflecting mirror provided diagonally above the frosted glass window 6 side).

Next, the photographing procedure will be described. The open / close door 7 of the box 1 is opened, three steel plates 9 for samples are placed on the pedestal 8, and the open / close door 7 is closed to block light from entering the box 1 from the outside. Then, by turning on the power of the illumination light 4, the horizontal light from the illumination light 4 is introduced into the box 1 through the frosted glass window 6. At this time, a part of the light of the illumination light 4 is diffusely reflected by the surface of the frosted glass 5 and dispersed, and in particular, the incident light in the length direction L of the frosted glass 5 in FIG. Light from the illumination light 4 at the longitudinal position of the steel plate 9 is equalized.

Further, by blocking a part of the light entering through the frosted glass window 6 with the round bar 10, the sample steel plate 9
The front end surface 9a of the above is prevented from being irradiated with the direct light from the illumination light 4, and the occurrence of halation on the front end surface 9a of the sample steel plate 9 is prevented. Further, a part of the horizontal light that has entered through the frosted glass window 6 and travels straight hits the blister B on the upper surface of the sample steel plate 9, and as shown in FIG.
Glass window 6 side ground of the blister B is bright, anti grinding
Because the glass window 6 side (opening door 7 side) becomes dark,
Blister B has a large shadow, and the blister B stands out.

Further, the blister B on the upper surface of the sample steel plate 9
The light that did not hit is reflected by the reflecting mirrors 11 and 12,
The upper surface of the sample steel plate 9 is abutted on the pedestal 8 from diagonally above. This makes it possible to uniformly irradiate the upper surfaces of the steel plates 9 for all samples with light without erasing the shadows on the blister B, and to keep the upper surfaces of the steel plates 9 for all samples at uniform brightness. . In this state, the upper surface of the sample steel plate 9 is photographed by the camera 2.

In this example, the round bar 1 is used as the shielding member.
Although 0 is used, the shape is not limited thereto, and any shape may be used as long as it can block the light that strikes the end surface 9a of the sample steel plate 9, and the shape is not particularly limited. Further, the color is preferably black in order to prevent reflection of light. Further, it is preferable that the inside of the box 1 is also black, like the shielding member.

If the thickness of the sample steel plate 9 and the number of the sample steel plates 9 placed on the mount 8 are the same, the height of the mount 8 and the angles of the reflecting mirrors 11 and 12 may be fixed. However, when the thickness of the sample steel plate 9 changes, the height of the pedestal 8 is made adjustable, and the height of the pedestal 8 is adjusted according to the thickness of the sample steel plate 9, and the pedestal 8 is adjusted. The height of the upper surface of the sample steel plate 9 placed on the top is always constant.

Further, when the number of the sample steel plates 9 placed on the pedestal 8 changes, the angles of the reflecting mirrors 11 and 12 can be adjusted so that the number of the sample steel plates 9 on the pedestal 8 can be adjusted. Accordingly, the angles of the reflecting mirrors 11 and 12 are adjusted so that all the sample steel plates 9 on the pedestal 8 are evenly contacted.

[0014]

EFFECTS OF THE INVENTION According to the present invention, a blister on the upper surface of a mirror-finished steel plate can be clearly photographed with simple equipment without requiring skill, and the effect in this field is great. It is a thing.

[Brief description of drawings]

FIG. 1 is a side sectional view of an embodiment of the present invention.

FIG. 2 is a perspective view of an embodiment of the present invention.

FIG. 3 is an explanatory view showing a blister generated on a steel plate.

[Explanation of symbols]

 1: Box 2: Camera 3: Set hole 4: Illuminating light 5: Frosted glass 6: Diffusing glass window 7: Open / close door 8: Stand 9: Steel plate for sample 9a: Front end face of steel plate for sample 10: Shielding member ( Round bar) 11, 12: Reflecting mirror B: Blister R: Camera lens

Claims (1)

(57) [Scope of utility model registration request] 1. A camera for photography is provided in an upper part of a photography room where external light is blocked, a glass window for diffusing light is provided on a side portion of the photography room, and the camera for photography is further provided. Underneath , and at a horizontal position inside the light- scattering glass window, a pedestal for mounting the sample steel plate is provided, and the upper surface is the same as the upper surface of the sample steel plate between the gantry and the light- scattering glass window. a shielding member which is level position is provided, wherein the illumination lights to the outside of the diffuser glass window provided, glass window side for the diffuser the light parallel to incident along the specimen steel plate top surface through said diffuser glass windows from the light Is provided obliquely above, and a reflecting mirror is provided to obliquely irradiate the upper surface of the sample steel plate with the reflected light from the reflecting mirror.