Ultrasonic detection device for fan shaft

The utility model discloses an ultrasonic detection device for a fan shaft. The utility model relates to the technical field of ultrasonic detection. The device comprises an ultrasonic probe, a supporting ring sleeve, a sliding box and a plurality of supporting pulleys, the fan shaft is sleeved with the supporting ring sleeve. The supporting pulley is in rolling connection with the side wall of the fan shaft; the supporting pulley is connected with the supporting ring sleeve through a lifting connecting rod piece and is used for supporting the supporting ring sleeve; the sliding box is arranged on the supporting ring sleeve in the circumferential direction of the supporting ring sleeve in a sliding mode, the sliding box is connected with a driving assembly for driving the sliding box to operate along the supporting ring sleeve, and the ultrasonic probe is connected with the sliding box through a connecting block and is attached to the side wall of the draught fan shaft in a sliding mode. And the ultrasonic de