Ball valve purging device and ball valve purging method for element analyzer solid sampler

The invention provides a ball valve purging device and a ball valve purging method for an element analyzer solid sampler. The device comprises a ball valve disposed at the opening position of the upper end of a combustion tube, wherein the valve core of the ball valve is spherical and has a counterbore, and the valve core is respectively defined to be located in a drop position, a purging position, and an injection position according to the directions of the counterbore with the opening upward, toward the side, and downward; the ball valve is connected with a purging gas path and a draining gas path, the purging gas path can communicate with the counterbore when the valve core is in the purging position, the draining gas path can discharge the high pressure gas of the purging gas path, anda solenoid valve is provided on the draining gas path. Due to the cooperation between the rotation of the valve core and the on-off of the electromagnetic valve, the ball valve purging device and ball valve purging method fo