Calculation formula and theoretical value of hydraulic cylinder's output

- Dec 26, 2017 -

When designing cylinders, the hydraulic engineer must know the following parameters:

A. Cylinder diameter, rod diameter, travel

B. Working pressure or cylinder load

C. Working ambient temperature

D. Working media

E. Speed of operation

F. Other parameters, such as connection form, installation size

Cylinder diameter, rod diameter, stroke as far as possible by national standards or other standards, to avoid the use of non-standard size, or increase processing difficulties and manufacturing costs.

Depending on the length of the trip to determine the length of cylinder.

According to work pressure or load to check the strength of cylinder, piston rod, screw, etc. At the same time work pressure, ambient temperature, working medium, operating speed is also the key to the selection of seals.

Different types of seals under pressure, temperature, medium, speed is not the same, water-ethylene glycol medium (HFC) can not be sealed with polyurethane, can only be sealed with rubber;

Oil cylinder running speed should be used with slip ring seal, such as the Rooster seal, cells ring, gd1000k, TDI, etc., the operation speed is slow, can be yx type, U-type, V-type combination seal, etc.

High temperature and pressure environment with fluorine rubber seals;

The buffer sleeve and the buffer valve must be considered when running fast. Cylinder design is the first step of product quality, if the design is wrong, processing quality can not meet the requirements.

(ii) Machining accuracy

Cylinder processing methods commonly used in two kinds, one is coarse boring-precision boring-rolling, general use of by seamless steel tubes, this method of processing quality, low cost efficiency, the equipment, The mechanic demanded low.

Another method is to use 20# cold drawn seamless steel tube, and then honing, the cost is lower, to the equipment, the mechanic requirements.

Before the piston rod processing must adjust the quality straightening, the piston rod's coating thickness is generally not less than 0.03mm.

The piston must be machined strictly according to the Groove Dimension tolerance zone given in the seal manual. Now some manufacturers to reduce costs, the piston rod is not tuned, the rod coating is not enough, the cylinder smooth finish is not, the guide sleeve of the use of copper, and changed to ductile iron, although the cost is reduced, but the hydraulic cylinder life is greatly reduced.


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