Level instrument and method for surveying mining subsidence zone in coal mining area

A level instrument for surveying a mining subsidence zone in a coal mining area, comprising a bottom plate, a leveling mechanism, a lifting mechanism, and a level instrument body, wherein

• the leveling mechanism is provided on the bottom plate, the lifting mechanism is provided on the leveling mechanism, and the level instrument body is provided on the lifting mechanism;
• the leveling mechanism is rotatable in a space to adjust a levelness of the lifting mechanism and the level instrument body, and the lifting mechanism is movable up and down to adjust a height of the level instrument body;
• the leveling mechanism comprises a screw rod, a threaded sleeve, a rotating disc, a spherical shell, and a groove;
• the screw rod is fixed to the bottom plate;
• the threaded sleeve is sleeved on the screw rod;
• and the rotating disc is provided on the threaded sleeve;
• the spherical shell is slidably provided on the rotating disc;
• and
• a lower end of the groove is provided with a sphere, and the sphere is fitted into the spherical shell.