PURPOSE: To dispense with a long mast for effectively miniaturizing, and to greatly facilitate assembling and fitting work by stably securing the distance between the detector and an object to be examined by means of a scanner part, and by supporting the scanner with chains.
CONSTITUTION: In the inside of an inspection device body 1, a scanner to be used for maintaining rigidity in the circumferential direction of a vessel, and drums 11 for winding up hoisting chains 5 in the perpendicular direction to the scanner are provided, so that the scanner 4 can be lifted or lowered by turning the drums. By controlling the rotation of the drums, a prescribed height can be obtained. The scanner 4 is mounted with a ultrasonic probe 12, and this is moved laterally by means of a driving mechanism 14. By turning a propeller, a thrust is obtained, and by means of spacers 13 the distance between the probe and an object to be examined is maintained so as to be constant. In the case of ultrasonic examination, to carry out angle beam testing in which ultrasonic waves are obliquely incident on the object to be examined, the distance between the probe and the object to be examined must be kept constant.
ASANO KUNITAKA
SASAKI TSUKASA
HITACHI ENG CO LTD
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