Patent ID: 7854168

Claim:
A device for measuring a thickness of a vessel steel plate comprising: a traveling carriage traveling with left and right front wheels and left and right rear wheels, and provided with a steering mechanism capable of changing a radius of curvature of a traveling track of the front wheels, the traveling carriage traveling on a steel plate of a vessel mirror part formed by a curved surface having a predetermined curvature and a circular projection form; an ultrasonic probe unit mounted on the traveling carriage and provided with a plurality of ultrasonic probes; a supporting point member detachable from a supporting point set at a central axis of the vessel mirror part; and a turning radius regulating member having one end to which the traveling carriage is connected rotatively via a rotation guide joint and the other end provided relative to the supporting point member rotatively around the supporting point member, and regulating a spaced distance between the supporting point set at the central axis of the vessel mirror part and the traveling carriage.