Video inspection device and method for omega welding seam at lower part of control rod driving mechanism

The invention relates to the technical field of nondestructive testing of nuclear power stations, and particularly discloses a video inspection device and method for an omega welding seam at the lowerpart of a control rod driving mechanism. The device comprises a vehicle body, a multi-degree-of-freedom mechanical arm and a pan-tilt camera, wherein the vehicle body can go straight, retreat and make a turn; the multi-degree-of-freedom mechanical arm is arranged on the vehicle body, and the multi-degree-of-freedom mechanical arm can be folded or the end of the multi-degree-of-freedom mechanicalarm can be lifted by a certain height; the pan-tilt camera is arranged at the end part of the multi-degree-of-freedom mechanical arm; and when the multi-degree-of-freedom mechanical arm is in a foldedstate, the inspection device can integrally enter a heat preservation layer through a vent hole in the upper end of a pressure container. According to the device and the method, problems in video inspection of a closed space a