Hydraulic cylinder structure forms can be divided into several types?
According to the structure of common hydraulic cylinders, they can be divided into four types:
Piston type——single piston rod hydraulic cylinder has a piston rod at only one end. It is a single-piston hydraulic cylinder. 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.
Plunger type——
(1) The plunger type hydraulic cylinder is a single-acting hydraulic cylinder, which can only achieve one direction of movement by hydraulic pressure, and the return stroke of the plunger depends on other external forces or the weight of the plunger;
(2) The plunger is only supported by the cylinder liner without contacting the cylinder liner, so that the cylinder liner is very easy to process, so it is suitable for long-stroke hydraulic cylinders;
(3) The plunger is always compressed during operation, so it must have sufficient rigidity;
(4) The weight of the plunger is often large, and it is easy to sag due to its own weight when placed horizontally, causing unilateral wear of the seal and guide, so its vertical use is more advantageous.
Telescopic type——telescopic hydraulic cylinder has two or more stages of pistons. The sequence of the extension of the pistons 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, while the length when retracted is shorter, and the structure is more compact. This kind of multi stage hydraulic cylinder is often used in construction machinery and agricultural machinery.
Swing type——swing type hydraulic cylinder is an executive element that outputs torque and realizes reciprocating motion, also called swing type hydraulic motor. There are two forms of single blade and double blade. The stator block is fixed on the cylinder, and the blade and the rotor are connected together. According to the direction of oil intake, the blades will drive the rotor to reciprocate.