ULTRASONIC FLAW DETECTOR OF SMALLLDIAMETER THINNWALL TUBE INTERIOR

摘要

PURPOSE:To increase the profiling precision with respect to the plane of inspection, by coupling the ultrasonic probe and the permanent magnet to surround this to a scanning mechanism through a universal joint. CONSTITUTION:A universal joint 9 is linked, by way of an arm 8, to a scanning mechanism 6 which reciprocates through the rotations of screw shaft 7, and an ultrasonic probe 10 and a permagnet magnet 11 which surrounds this are coupled to the universal joint 9. By moving the scanning mechanism 6 on the plane of inspection of the object being inspection 13 having a plain surface and an inclined surface, even when the ultrasonic probe 10 is caused to scan, one end of the universal joint 9 turns at right angle to the plane of inspection due to the attraction of the permanent magnet 11 to the plane of inspection, so that the ulstrasonic probe 10 is always opposed at right angle to the tangent of the plane of inspection. Therefore, without using complicated jimbal structure or the like, the two-dimensional position holding of the ultrasonic probe 10 may be possible, so that the profiling precision with respect to the plane of inspection may be enhanced.