Cylinder is to guide the piston in the cylinder for linear reciprocating motion of the cylindrical metal parts. The role of the cylinder is to convert the pressure of compressed air into mechanical energy, drive the mechanism for linear reciprocating motion, swing and rotary motion.

Cylinder is composed of cylinder, end cap, piston, piston rod and seals, etc. The working principle of the cylinder is that the pressure of the air to make the piston move, by changing the direction of air intake, change the direction of movement of the piston rod.

Cylinder to do reciprocating linear motion and do reciprocating swing two types, do reciprocating linear motion of the cylinder can be divided into single-acting cylinders, double-acting cylinders, diaphragm cylinders and impact cylinders:

1. Single-acting cylinder: only one end of the piston rod, from the piston side of the gas supply to generate air pressure, air pressure to push the piston to generate thrust out, return by spring or self-weight;

2. Double-acting cylinders: alternate air supply from both sides of the piston, output force in one or two directions;

3. Diaphragm cylinder: replace the piston with a diaphragm, output force in one direction only, reset by spring. It has good sealing performance but short stroke;

4. Impact cylinder: this is a new type of component. It converts the pressure energy of compressed gas into the kinetic energy of piston’s high-speed (10-20 m/s) movement, lending itself to work;

5. Rodless cylinder: there is no piston rod cylinder of the general term. There are magnetic cylinder, cable cylinder two categories.