| 摘要 |
<p>PROBLEM TO BE SOLVED: To easily and reliably detect a double tube coated with a coating having a double layer structure. SOLUTION: A positioning part 11C to position the outer circumference of a double layer part WR is installed in this inspection apparatus. Pressurizing elements 12A to pressure the WR positioned in the positioning part 11C are also installed. Judgment parts 12B, 13B to judge the difference of the displacement amounts of the pressure elements 12A due to the existence of a inner tube C1 are further installed. In a preferable structure of the apparatus, a plurality of pressure elements 12A, 13A and a plurality of judgment parts 12B, 13B are installed. Consequently, the existence of a inner tube C1 can be detected without visual check.</p> |
