Piston type hydraulic cylinder can be divided into single rod type and double rod type two structures, its fixed way by the cylinder body fixed and piston rod fixed two kinds, according to the action of fluid pressure has single action type and double action type. In the single-acting hydraulic cylinder, the pressure oil only provides a cavity of the hydraulic cylinder, relying on the hydraulic pressure to realize the cylinder movement in one direction, the reverse direction movement depends on external forces (such as spring force, dead weight or external load) to achieve; But the double action hydraulic cylinder piston two direction movement is through the two cavities alternating oil, depending on the action of liquid pressure to complete.
Schematic diagram of single rod double acting piston hydraulic cylinder. It only has a piston rod on one side of the piston, so the effective area of the two cavities is different. When the amount of oil supplied is the same, the movement speed of piston is different with different chamber. In the need to overcome the same load force, different cavity oil, the need for oil supply pressure is different, or after the system pressure is set, the sanitation garbage truck hydraulic cylinder movement in two directions to overcome the load force is different.
Plunger type :(1) plunger type hydraulic cylinder is a kind of single-acting hydraulic cylinder, relying on the hydraulic pressure can only achieve one direction of movement, plunger return journey to rely on other external forces or plunger weight; (2) the plunger is only supported by the cylinder liner and does not contact with the cylinder liner, so the cylinder liner is easy to process, so it is suitable for making long-stroke hydraulic cylinder; (3) when working, the plunger is always under pressure, so it must have sufficient stiffness; (4) the weight of the plunger is often large, and it is easy to sag due to its weight when placed horizontally, which causes wear of the seal and guide unilateral, so it is more advantageous to use it vertically.
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