Multi-stage cylinder acting sequentially

The utility model discloses a multi-stage cylinder acting sequentially. According to the multi-stage cylinder acting sequentially, a hole is drilled in a cylinder cover and is used for air intake or air exhaust, a first-stage cylinder body is connected with the cylinder cover through screws, a step is arranged at one end of the first-stage cylinder body and is used for controlling the stroke of a first-stage piston, a groove is formed in the portion, close to the step, of the first-stage cylinder body so that a gas circuit can be formed conveniently, a hole is drilled in one end of the first-stage cylinder body and is used for air intake or air exhaust, a through hole is formed in one side of the first-stage piston, a one-way valve b with a rod is installed in the through hole in one side of the first-stage piston, a hole is formed in the first-stage piston in the radial direction, a through hole is formed in the piston in the direction of the axis of the piston, a one-way valve a is installed in the through hole formed in the piston in the direction of the axis of the piston, the radial hole and the axial hole intersect at the position of the axis, and an L-shaped hole is formed in the first-stage piston and is connected with a hole in a second-stage cylinder body; the structure of the second-stage cylinder body and the structure of a third-stage cylinder body are the same as the structure of the first-stage cylinder body. According to the multi-stage cylinder acting sequentially, the cylinder bodies can be controlled to act in sequence, mutual influence of the gas circuits is avoided, and accurate positioning of the multi-stage cylinder can be achieved. The multi-stage cylinder acting sequentially is suitable for the occasions, on which electric signals can not be used, having the requirements for fire and explosion prevention, small size, long stroke and accurate stroke control and has quite broad application prospects.