Piston reset mechanism and brake cylinder comprising same

The piston reset mechanism comprises a reset spring and a spring seat fixed in the brake cylinder, the reset spring is a conical spring, the upper end of the conical spring abuts against the lower bottom face of the wedge-shaped piston, and the bottom of the conical spring is supported by the spring seat. Wherein the spring seat is fixed on a box body of the brake cylinder through a bolt, the spring seat is provided with a bulge, and the bottom of the reset spring is tightly hooped on the bulge. The conical spring is supported through a conical spring seat installed on the box body, resetting of the wedge-shaped piston in the exhaust state is achieved through spring compression elastic force, and a cylindrical protrusion is additionally arranged on the spring seat and used for fixing the conical spring. The conical spring can achieve the high compression ratio, basic flattening can be achieved, the contradiction between space limitation and the stroke of the wedge-shaped piston in the braking process is solve