Device and method for measuring volume of spherical tank

A device for measuring volume of a spherical tank, a top of the spherical tank being provided with an opening, a surrounding plate being provided on an edge of the opening, and the device comprising:

• a base;
• four supporting rods;
• a driving mechanism;
• a rotating disc;
• and
• a counterweight mechanism;
• wherein the base is fixedly provided with a fixing base with a circular shape;
• the base is also provided with a first through hole;
• and the fixing base is provided with a second through hole directly opposite to the first through hole in a vertical direction;
• the four supporting rods are circumferentially arranged on the fixing base;
• a length direction of each of the four supporting rods is consistent with a radial direction of the fixing base;
• a lower side of each of the four supporting rods is slidably provided with a sliding rod;
• and an outer end of the sliding rod is provided with a limiting plate;
• the driving mechanism is arranged on the base, and is configured to drive four sliding rods to simultaneously move along the radial direction of the fixing base;
• the rotating disc is arranged on the fixing base, and is provided with a third through hole located directly above the second through hole;
• the rotating disc is rotatably provided with a first rotating shaft;
• the first rotating shaft is coaxially provided with a reel;
• a steel tape is wound on the reel;
• a free end of the steel tape is configured to pass through the third through hole, the second through hole and the first through hole in sequence to reach a position below the base, and is provided with a balancing disc;
• and opposite sides of the balancing disc are each provided with a laser rangefinder;
• and two laser rangefinders are located on the same straight line;
• and
• the counterweight mechanism is arranged on the balancing disc, and is configured to keep the balancing disc stable.