Digital ultrasonic flaw detection device

The utility model discloses a digital ultrasonic flaw detection device. The device comprises a frame, a bar rotating drive mechanism and a motion flaw detection mechanism. The utility model is characterized in that the bar rotating drive mechanism comprises a plurality of underroller assemblies, a motor I and a rotating shaft, the underroller assemblies are arranged at the upper end of the frame and uniformly arranged along the axial direction of bars, the motor I is arranged at the side end of the frame, and the rotating shaft used for transmitting motor I power penetrates through the underroller assemblies; each underroller assembly consists of two underrollers symmetrically connected at the bottom of the bars, and the two underrollers are driven by the motor I through the rotating shaft to rotate in the same direction and drive the bars to rotate. Bar multi-point support is realized by supporting the bars with multiple underroller assemblies, and the bars are linked by the rotating underrollers to stably rotate. Detection reliability and stability are improved. As the bars do not need to be clamped, detection blind zones are eliminated.