Pinhole inspection device for tanks

Abstract

The pinhole inspection device for cans according to the present invention includes: a rotating plate having a through hole; a movable plate provided on the side of the fixed frame facing the rotating plate; and a can holding member supporting the main body of the can. a photodetector for detecting light leaked into the inside of the can body; and a light source for irradiating light on the outer peripheral surface of the can body, the pinhole inspection device for the can body is characterized in that the movable plate The front surface of the piston member having a through-hole in the center is equipped with an annular plate via a joint member, and a shielding member composed of an annular member formed concentrically with the through-hole is provided on the above-mentioned annular plate. The blocking member is in sliding contact with the rotating plate, thereby effectively preventing disturbance light from reaching the photodetector side through the gap between the movable plate and the rotating plate caused by external force or the surface state of the sealed annular plate and the sliding annular plate. .

Description

technical field [0001] The present invention relates to an inspection device for inspecting pinholes formed in the main body of a can body or the like. Background technique [0002] In the manufacturing process of metal cans such as seamless cans (hereinafter simply referred to as cans) produced by deep drawing and thinning, pinholes such as holes and cracks may occur in the main body of the above-mentioned cans. . The presence or absence of the above-mentioned pinholes is generally inspected by a pinhole inspection device used in the above-mentioned inspection process of the can body. [0003] Such as Figure 10 As shown, the pinhole inspection device shown in Patent Document 1 is configured as follows: the right side is an inspection turntable holding the can body to be inspected, and the left side is a can body internal light detection device. In addition, the piston-shaped sealing portion to which the sealing ring plate is fixed is provided so as to be in slidable cont...

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Problems solved by technology

[0008] In addition, the light-shielding part described in Patent Document 3 adopts a complicated structure in which the opposing fixed-side disk is embedded in a peripheral groove, so its position adjustment is difficult. In addition, the specification also discloses that a The return bending of light to the direction of intrusion, but its effect has not been fully explained, and the above problems have not been fully resolved

[0009] In addition, in terms of the performance of the photodetector, the pinhole diameter of the inspection target of the existing pinhole inspection device for cans is about 20 μm. The light that penetrates the tank through the hole becomes weak, and there is a concern that the amount of light that cannot be detected will not be achieved

Here, a method of ensuring the amount of light detectable by the photodetector by using a light source with a higher brightness than before is considered, but in the existing device structure, countermeasures against disturbing light are not sufficiently taken, and there are errors caused by an increase in the amount of light. Concerns about rising rates of testing

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