Tricrystal piece combined probe of ultrasonic inspection for wheel axle

The utility model relates to a three-crystal-piece combined probe of ultrasonic inspection for wheel axles, which belongs to a matching probe of an ultrasonic automatic inspection device. The three-crystal-piece combined probe of ultrasonic inspection for wheel axles comprises an outer shell, wherein, the top surface of which has three sockets, and the both sides has a clamp convex lug. Two transparent wedge-shaped organic glass cutting blocks and one piece-shaped cutting block are arranged in the outer shell; crystal pieces are stuck on the inclined surfaces of the wedge-shaped cutting blocks and the piece-shaped cutting block. The angles of refraction of the crystal pieces on the inclined surfaces of two wedge-shaped cutting blocks are respectively beta 1 = 35 to 60 DEG, beta 2 = 45 to 70 DEG; the angle of incidence of the crystal piece on the piece-shaped cutting block is 0 DEG. Three crystal pieces are arranged on one probe to simultaneously detect, which avoids leak detection and is timesaving and laborsaving.