Pneumatic-type precision annular workpiece inner positioning surface clamping device

A pneumatic-type precision annular workpiece inner positioning surface clamping device, characterized in that, an upper plate (14) and a lower plate (1) are fixed onto the upper and lower end surfaces of a cylinder body (15), respectively;

• a wedge-shaped block (12) is fixed on the upper plate (14), forming a closed chamber in the cylinder body (15);
• a rod portion of a piston assembly (5) is inserted into a central hole of the wedge-shaped block (12), and the piston portion of the piston assembly (5) is provided in the closed chamber formed in the cylinder body (15), dividing the closed chamber into an upper chamber and a lower chamber which are completely separated from each other;
• a seal ring (2) is provided on the outer circular surface of the piston portion of the piston assembly (5);
• a disc spring (3) is sleeved on the piston assembly (5) and is located in the upper chamber of the cylinder body (15);
• the upper end surface of the disc spring (3) is fitted to contact with the lower end surface of the upper plate (14), and the lower end surface of the disc spring (3) is fitted to contact with the piston portion of the piston assembly (5) through a washer (13);
• an air intake hole (1-1) communicating with the lower chamber of the cylinder body (15) is provided in the lower plate (1), and an air vent hole (15-1) communicating with the upper chamber of the cylinder body (15) is provided at the upper portion of the cylinder body (15);
• an elastic hinge block (6) which is capable of contracting or expanding along a radial direction is sleeved outside the upper side of the wedge-shaped block (12);
• a limited ring (4) is nested outside the elastic hinge block (6);
• an adapter plate (11) is fixed to the upper end of the rod portion of the piston assembly (5) through pretightening screws (8), and is connected with the elastic hinge block (6);
• an adjustment knob (9) is provided on the adapter plate (11) through threaded fitting;
• limited screws (7) and a limited pillar (10) are inserted into the adapter plate (11) and are in threaded connection with the wedge-shaped block (12).