What are the classifications of hydraulic cylinders according to their structures?

Piston Hydraulic Cylinder: A single piston rod hydraulic cylinder has a piston rod on only one end. The inlet and outlet ports A and B at both ends can pass pressure oil or return oil to achieve two-way movement, so it is called a double-acting cylinder.
Telescopic hydraulic cylinder: It has two-stage or multi-stage pistons. The order of the piston extension in the telescopic hydraulic cylinder is from large to small, while the order of no-load retraction is generally from small to large. The telescopic cylinder can achieve a longer stroke, but has a shorter length when retracted, making the structure more compact. This type of hydraulic cylinder is often used in construction machinery and agricultural machinery.
Swing hydraulic cylinder: It is an actuator that outputs torque and achieves reciprocating motion. It is also called a swing hydraulic motor. There are two forms: single blade and double blade. The stator block is fixed to the cylinder, while the blades and rotor are connected together. According to the direction of oil inlet, the blades will drive the rotor to swing back and forth.