Oil and gas pipeline defect internal detector universal joint

An oil and gas pipeline defect internal detector universal joint comprises a hollow through connection shaft, wherein the front end and the back end of the hollow through connection shaft are connected with back end shaft holes of two hollow butterfly-shaped cross-shaped fork blocks through rotating hinge pins to be locked through locking nuts, connecting pin holes in the two ends of the hollow through connection shaft are perpendicular to each other, the two hollow butterfly-shaped cross-shaped fork blocks are symmetrically arranged, the front ends of the butterfly-shaped cross-shaped fork blocks are provided with shaft holes, the shaft holes are hinged to a flange on a functional joint of an oil and gas pipeline defect internal detector through a flange connecting hinge pin, the shaft holes in the front ends of the butterfly-shaped cross-shaped fork blocks are perpendicular to the shaft holes in the back ends of the butterfly-shaped cross-shaped fork blocks respectively, and the surfaces, matched with the shaft holes, of the flange connecting hinge pin are provided with sliding thrusting copper sleeves. According to the oil and gas pipeline defect internal detector universal joint, the number of parts is small, the structure is simple, dismounting and mounting are convenient, reliability is high, a cable cannot be exposed outside, the good effect of protecting the electric cable of the oil and gas pipeline defect internal detector is achieved, using working conditions of the oil and gas pipeline defect internal detector are met, and the oil and gas pipeline defect internal detector universal joint can be used for connecting functional joints of oil and gas pipeline defect internal detectors with different types and different calibers.