| 摘要 |
<p>PURPOSE:To enable the detection of an extraordinary form of the outer surface of a pipe even when it has a different outside diameter from others in a non- contact manner even with any vertical motion thereof without giving any damage to an installation, by detecting the extraordinary form of the outer surface of the pipe moving in the axial direction, based on a signal of an optical detector having a plurality of sensors parallel to the direction perpendicular to the axis of the pipe moving in the axial direction. CONSTITUTION:A light source 5 is combined with a lamp-condensing lens and has an angle of application enabling, at least, the irradiation of the sensors of an optical detector 6. The optical detector 6 is constituted in combination with a plurality of sensors arranged in parallel to the direction perpendicular to the axis of a steel pipe 1 moving in the axial direction thereof. Since a light from the light source 5 is received by the plural sensors of the optical detector 6, positions on the outer surface of the steel pipe 1 which are located in the directions perpendicular to the axis of the pipe moving in the axial direction thereof can be detected on the basis of light-reception signals of the plural sensors. When the steel pipe 1 having a fish tail 1b moves and the projection of the fish tail 1b passes through the sensor part of the optical detector 6, a light-reception signal is obtained in the optical detector 6. The position of a plot changes corresponding to the fish tail 1b, and an extraordinary form can be detected by detecting the position protruding from a normal position.</p> |
