Device and method for driving cylindrical roller to rotate at high speed in air floatation state

The invention relates to a device and method for driving a cylindrical roller to rotate at a high speed in an air floatation state. The device comprises a stroke-adjustable air cylinder, an air floatation motorized spindle, a wear-resistant connecting piece, a piston, a welding head and an air floatation tool. A guide rod of the stroke-adjustable air cylinder is connected with the air cylinder guide rod extension piece, a rotor of the air flotation electric spindle is provided with a center hole, the welding head is fixed to the head of the rotor, the piston is coaxially assembled in the center hole and can move up and down in the center hole, and the spring is arranged between the piston and the welding head. A vacuum cavity is defined by the piston, the center hole and the welding head, an air hole is formed in the center of the welding head, one end of the air hole is communicated with the vacuum cavity, and the other end of the air hole is communicated with an inner cavity of a vacuum suction cup of the a