What Are The Classifications Of Hydraulic Cylinders

There are various structural forms of hydraulic cylinders, and their classification methods are also diverse: they can be divided into linear reciprocating motion and rotary swing motion according to their motion mode; According to the effect of hydraulic pressure, it can be divided into single acting and double acting types; According to structural form, it can be divided into piston type, plunger type, multi-level telescopic sleeve type, gear rack type, etc; According to the installation form, it can be divided into pull rods, earrings, feet, hinge shafts, etc; According to the pressure level, it can be divided into 16Mpa, 25Mpa, 31.5Mpa, etc.
Piston type
A single piston rod hydraulic cylinder only has a piston rod at one end. As shown in Figure 1, it is a single piston hydraulic cylinder. The inlet and outlet ports A and B at both ends can be filled with pressure oil or return oil to achieve bidirectional movement, hence it is called a double acting cylinder.
The piston can only move in one direction, and its reverse movement needs to be completed by external force. But its stroke is generally larger than that of piston hydraulic cylinders.
The piston type hydraulic cylinder can be divided into two structures: single rod and double rod. Its fixing methods are fixed by the cylinder body and piston rod, and there are single acting and double acting according to the action of hydraulic pressure. In a single acting hydraulic cylinder, pressure oil is only supplied to one chamber of the cylinder, and the cylinder moves in one direction through hydraulic pressure, while the opposite direction movement is achieved through external forces such as spring force, self weight, or external load; The movement of the dual acting hydraulic cylinder piston in both directions is achieved by alternating oil injection through the two chambers, relying on the action of hydraulic pressure.