The utility model relates to the technical field of tubes and bars, and discloses an ultrasonic
detector for detecting tubes and bars, which comprises a base, a
machine body and a detection head. Through the arrangement of the base, the
machine body, the detection head, the fixing device, the mounting mechanism and the positioning mechanism, firstly, a
pipe and a bar are mounted on the fixing frame, the fixing device is turned on, a second gear drives a lead screw to rotate, the lead screw is connected with the fixing frame through threads to move, the fixing frame fixes the
pipe and the bar, then the detection head is mounted on a mounting ring, and a
threaded rod is rotated. The
threaded rod drives the positioning plate to move through threaded connection, the positioning plate fixes the detection head, the detection head moves to the surface of the
pipe bar and is fixed with the assistance of the binding band, the pipe bar is detected through the detection head, and the problems that in the prior art, an ultrasonic probe needs to be manually held to detect the pipe bar, manual holding is conducted for a long time, and the detection efficiency is high are solved. And a certain fatigue feeling can be caused, so that the detection efficiency is reduced.