The double-acting hydraulic cylinder means that the cylinder rod is extended and retracted by hydraulic pressure.
The double rods hydraulic cylinder means that the cylinder rod can extend and retract from both ends of the hydraulic cylinder.
These are two different concepts. Today I will explain in detail the difference between a double acting hydraulic cylinder and a double rods hydraulic cylinder.
一. Double Acting Hydraulic Cylinder
According to the working conditions and structure, hydraulic cylinders can be divided into double-acting cylinders and single-acting cylinders. There are two types of single-piston rod and double-piston rod respectively.
The so-called double-acting cylinder means that the piston can be pushed out and pulled back against the load force in both directions by relying on the pressure oil on both sides. To put it simply, both chambers are filled with oil, and the movement in both directions needs to be driven by oil pressure.
(1) Single piston rod cylinder
Only one side of the single piston rod cylinder has the piston rod protruding. Because the effective areas of the two chambers are different, they are often called differential cylinders. The application is extremely wide, accounting for more than 85% of all practical hydraulic actuators.
(2) Double Piston Rod Cylinder
A double-piston rod cylinder means that the piston rods extend out on both sides of the piston. Generally, the two rods have the same diameter, so the effective area on both sides of the piston is the same.
Double rods cylinder is a double rod hydraulic cylinder. If the cylinder body is fixed and the piston rod is connected to the worktable, the reciprocating movement range of the hydraulic cylinder is three times its effective stroke.
If the piston rod is fixed and the cylinder is connected to the worktable, the range of motion is twice the effective stroke.
二. Single Acting Cylinder
Single-acting cylinders are used in situations where the direction of the load force is fixed. Only one side of the piston needs to be filled with pressure oil, and the other side can be filled with oil tank or atmosphere.
That is to say, the movement in one direction of the single-acting cylinder is driven by oil pressure, and the return is realized by external forces such as dead weight and spring.
The plunger cylinder is one of the single-acting cylinders. Cylinder rod, also called the plunger, is the same thickness as the cylinder inner tube. No piston. Can only reach out actively. Retract by external force.
The plunger can also be a thick-walled tube with one end closed (figure a to reduce weight. Single-rod single-acting cylinders such as plunger cylinders are more common, while double-rod single-acting cylinders are relatively rare.
The major difference between single-acting and double-acting hydraulic cylinders is the force they can generate.Single-acting cylinders can only generate a force in one direction and are often used for slower,steady forces.Double -acting cylidners,on the other hand,can generate a much greater force in both directions and are often used for applications where a large force is required in both directions.
三. Telescopic Hydraulic Cylinder
For single-acting telescopic hydraulic cylinders, the thicker stage is always extended first, and the thinner stage is retracted first.
Sudden change in active area ⇨ Sudden change in pressure
It can be extended and retracted simultaneously.
Double Acting Telescopic Hydraulic Cylinder, extend and retract by hydraulic pressure.
To sum up, the double (out) piston rod cylinder can be a double-acting cylinder or a single-acting rod. The double-rod double-acting cylinder is more common, and the double-rod single-acting cylinder is rare.
If you have any further questions about hydraulic cylinders, please contact email: alice@ai-soar.com or contact us.
