TUBE WALL THICKNESS MEASURING APPARATUS

Provided is a tube thickness measuring apparatus which measures the thickness of a tube (52). The apparatus includes: a main body (3); a sensor (8) mounted on the main body (3) and generating ultrasonic waves radially outward from a center of the tube (52) in the radial direction; a pair of flexible mechanisms (4) mounted to be flexible outward or inward in the radial direction and formed at regular intervals in the circumferential direction around the axis of the tube (52); a force applying member (5) for applying force to the flexible mechanism (4) so as to be extended; wheels (6) mounted oneach flexible mechanism (4) to guide the movement of the main body (3) in the direction of the axial direction (Da) of the tube while coming into contact with an inner circumferential surface of thetube (52); and a transmission mechanism (7) for converting an extension in the radial direction of one flexible mechanism (4a) into an extension in the radial direction of a remaining flexible mechanism (4b). 本发明提供种管壁厚测定装置，测定管