One-way sealing ball valve structure for coal mine gas sampling

The utility model discloses a one-way sealing ball valve structure for coal mine gas sampling. A centralizer, a shifting ring and a sampling drill bit are arranged outside the one-way sealing ball valve structure, and a core barrel, a spline pipe, a working ball, a pipe shoe, a transmission rod, a shifting rod and a reset spring are arranged inside the one-way sealing ball valve structure. The transmission rod penetrates through a spline pipe through hole to be fixed to the axial top of the working ball and can drive the working ball to axially rotate, after sampling is completed, when a drilling tool is lifted up and the one-way sealing ball valve mechanism passes through the shifting ring, the shifting rod drives the transmission rod to anticlockwise rotate by 90 degrees under the action of a protruding step in the shifting ring, and the transmission rod can pass through the step in the shifting ring. At the moment, the working ball just turns over by 90 degrees under the action of the transmission rod to c