Thick-wall pressure vessel welding joint phased array detection device

The invention relates to the technical field of phased array detection, and discloses a thick-wall pressure vessel welding joint phased array detection device which comprises a scanning frame, a sliding groove is formed in one side wall of the scanning frame, a telescopic air cylinder is arranged in the sliding groove, a fixing block is connected to a telescopic part of the telescopic air cylinder, a telescopic assembly is arranged at the bottom of the fixing block, and a clamping groove is formed in the bottom of the telescopic assembly. The device comprises a telescopic assembly, a clamping assembly is arranged at the bottom of the telescopic assembly, an ultrasonic phased array inspection mechanism is clamped in the clamping assembly, and a first distance sensor is arranged on the ultrasonic phased array inspection mechanism. Through the mutual cooperation between the first wheel set and the second wheel set, on one hand, the device is suitable for the detection of the circumferential welding joint and the