Ultrasonic inspection equipment for multi-pipe-diameter pipeline

The invention discloses ultrasonic inspection equipment for a multi-pipe-diameter pipeline. The ultrasonic inspection equipment comprises a probe; a hoop mechanism; a probe motion module; an encoder module; the hoop mechanism comprises a main body, connecting arms arranged on the two sides of the main body, tail end arms with the upper ends rotationally connected with the connecting arms, a locking pin used for locking or unlocking the tail end arms and connecting the tail end arms, a first roller arranged on the inner side of the main body and a roller locking block arranged on the main body and used for locking or unlocking the first roller. And an arc formed by the second roller mounted on the lower end part of the tail end arm, the main body, the connecting arms on the two sides of the main body and the tail end arm is larger than 180 degrees. The equipment diameter is adjustable, and the ultrasonic inspection requirements of pipelines with different pipe diameters can be met; compared with manual ultraso