Inner-support and gas-flotation static balancing device for rotating ring-shaped part and method of using the same

A method of using an inner-support and gas-flotation static balancing device for a rotating ring-shaped part, the device comprising a gas-flotation chamber (1), an end cover (2), a support base (3), a supporting column (4), a disc seat (5), and two axial positioning mechanisms (6), wherein a working gas cavity (1-2) and a plurality of cylindrical gas inlet channels (1-3) that communicate with the working gas cavity (1-2) are provided in the gas-flotation chamber (1);

• the working gas cavity (1-2) is located at a first end of the gas-flotation chamber (1);
• an arc-shaped working surface (1-1) is formed on a top end of the gas-flotation chamber (1);
• a plurality of gas inlet holes (1-4) that communicate with the plurality of cylindrical gas inlet channels (1-3) are formed in the working surface (1-1);
• the end cover (2) is fixedly mounted on an end face of the first end of the gas-flotation chamber (1) and the first end is adjacent to the working gas cavity (1-2);
• the end cover (2) is in sealed connection with the working gas cavity (1-2) of the gas-flotation chamber (1);
• a gas supply hole (2-2) that communicates with the working gas cavity (1-2) is formed in the end cover (2);
• a bottom end of the end cover (2) is rotatably connected to a top end of the support base (3);
• a second end, which is away from the working gas cavity (1-2), of the gas-flotation chamber (1) is connected to the disc seat (5) through the supporting column (4);
• and the two axial positioning mechanisms (6) are respectively mounted on two sides of the gas-flotation chamber (1) in an axial direction parallel to an axis of the gas-flotation chamber (1);
• the method comprising:
• placing the rotating ring-shaped part to be statically balanced on the gas-flotation chamber (1), and adjusting an elevation and a levelness of the gas-flotation chamber (1), such that the rotating ring-shaped part is located at a horizontal position;
• forming a gas film with bearing capacity between the working surface (1-1) of the gas-flotation chamber (1) and an inner surface of the rotating ring-shaped part through the working gas cavity (1-2) and the gas inlet holes (1-4) by external gas supply, so as to enable the rotating ring-shaped part to float;
• allowing the rotating ring-shaped part to rotate from a statically unbalanced position to a balanced position at a phase in which a first portion containing an unbalanced amount is at a lowest point, then either deweighting the first portion or weighting a second portion at a reverse phase to the first portion;
• and
• repeating the step of allowing the rotating ring-shaped part to rotate until a random phase is at the lowest point after the rotating ring-shaped part is static, so as to complete a static balancing operation of the rotating ring-shaped part.