What is the principle of cylinders? What types of cylinders are commonly used now?

1) Classify whether the gas pressure from the piston of the cylinder is unidirectional or bidirectional (1) Single-acting cylinder: the piston of the cylinder can only be pushed in one direction by air pressure, and external force is needed when it is reversed. (2) Double acting cylinder: the piston of the cylinder is pushed forward and backward by air pressure. 2) According to the installation form of the cylinder (1), the cylinder is fixed: the cylinder block is fixed. (2) Pin cylinder: The cylinder body can swing around the fixed pin for a certain angle. (3) Rotating cylinder: The cylinder block is usually fixed on the spindle of the machine tool and can rotate with the spindle of the random bed. This kind of cylinder is often used for pneumatic chucks on machine tools. 3) Classification by function and use (1) Ordinary cylinders: including single-acting and double-acting cylinders. This kind of cylinder is generally used without special requirements. (2) Buffer cylinder: The cylinder is equipped with a buffer device to avoid the strong impact when the piston moves to the bottom. This kind of cylinder is often used in workplaces with high pressure and fast movement speed. (3) Gas-liquid damping cylinder: The cylinder and hydraulic cylinder are connected in series, which can obtain more accurate movement speed. This kind of cylinder can be used in occasions with high speed regulation requirements. (4) Swing cylinder: The cylinder moves back and forth around the axis, which can be used for fixture indexing, valve switch, etc. (5) Impact cylinder: It is a kind of high-energy cylinder that uses the high-speed movement of piston rod to form impact force, which can be used for punching and cutting.