Volume measuring device for spherical tank and measuring method thereof

The invention provides a volume measuring device for a spherical tank and a measuring method of the volume measuring device, and belongs to the technical field of spherical tank volume verification. The device comprises a base, four supporting rods, a driving mechanism, a rotating disc and a counterweight mechanism, a circular first fixing seat is fixedly arranged on the base, a first through hole is formed in the base, a second through hole is formed in the first fixing seat, the four supporting rods are arranged on the first fixing seat in the circumferential direction, and sliding rods are arranged on the lower side faces of the supporting rods in a sliding mode; limiting plates are arranged at the outer ends of the sliding rods, the driving mechanism can make the four sliding rods move in the radial direction at the same time, the rotating disc is arranged on the first fixing base, a third through hole is formed in the rotating disc, a winding drum is rotationally arranged on the rotating disc, a steel ta