In pneumatics, cylinders belong to the most important actuators. Controlled by way-valves in their direction of movement, they can grip and deposit these workpieces in a controlled manner. Even rotational movement can be executed. It is up to you to choose the right cylinders in type and size.
Pneumatic cylinderare mechanical devices which use the power of compressed gas to produce a force in a reciprocating linear motion.Like hydraulic cylinders, something forces a piston to move in the desired direction.
The piston is a disc or cylinder, and the piston rod transfers the force it develops to the object to be moved.Once actuated, compressed air enters into the tube at one end of the piston and imparts force on the piston.
Consequently, the piston becomes displaced.There are also numerous other types of pneumatic cylinder available, many of which are designed to fulfill specific and specialized functions./wikipedia