Hydraulic cylinder classification

- Jul 26, 2018 -

The hydraulic cylinder has various structural forms, and there are various classification methods: it can be divided into linear reciprocating type and rotary swing type according to the movement mode; it can be divided into single-acting and double-acting according to the action of the receiving pressure; The form can be divided into piston type, plunger type, multi-stage telescopic sleeve type, rack and pinion type, etc.; according to the installation form, it can be divided into tie rod, earring, foot, hinge shaft, etc.; according to the pressure level can be divided into 16Mpa, 25Mpa , 31.5Mpa, etc.

Piston

A single piston rod cylinder has a piston rod at one end. As shown, it is a single piston hydraulic cylinder. Both ends of the inlet and outlet ports A and B can pass pressure oil or return oil to achieve two-way movement, so it is called double-acting cylinder.

The piston can only move in one direction, and the movement in the opposite direction needs to be done by external force. However, the stroke is generally larger than that of a piston hydraulic cylinder. The piston type hydraulic cylinder can be divided into two types of single rod type and double rod type. The fixing method is fixed by the cylinder body and the piston rod. According to the action of the hydraulic pressure, there are single acting and double acting. In the single-acting hydraulic cylinder, the pressure oil is only supplied to one cavity of the hydraulic cylinder, and the hydraulic pressure causes the cylinder to move in one direction, and the reverse movement is realized by an external force (such as spring force, self-weight or external load); The movement of the hydraulic cylinder piston in two directions is alternately introduced into the oil through the two chambers, and is completed by the action of the hydraulic pressure. As shown in the figure, it is a schematic diagram of a single-rod double-acting piston hydraulic cylinder. It only has a piston rod on one side of the piston, so the effective working area of the two chambers is different. When the oil supply amount is the same, different chambers enter the oil, and the movement speed of the piston is different; when the load force to be overcome is the same, the oil supply pressure is different for different chambers, and the required oil supply pressure is different, or after the system pressure is set, the sanitation The load force of the garbage truck hydraulic cylinder can be overcome in two directions.

Plunger


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