Hydraulic system fault analysis and Solutions

With the development of hydraulic technology, the hydraulic system has been widely used in various industrial sectors. But the hydraulic oil is divided into many kinds according to the applicable scope and the quality. In order to ensure the normal operation of the hydraulic system and ensure the reliability of the work, the correct selection of hydraulic oil varieties and viscosity is a worthy preparation.

On the other hand, when the hydraulic system fails, it is a very important skill to find out the causes and analyze the corresponding countermeasures skillfully and accurately. A complete hydraulic equipment is composed of mechanical, hydraulic, electrical and instrument, so it is necessary to understand the transmission principle, structural features and components and materials configuration of the whole hydraulic system, and then formulate the corresponding solutions.

Because the hydraulic system is a sealing belt pressure system, the flow of oil in the pipeline, the hydraulic components of the internal action and sealing are not easy to observe, so the analysis of the causes of the fault and determine the location of the fault is more difficult.

There are many reasons for the failure of hydraulic system, and there are three aspects:

One is the mechanical failure of the equipment, which includes unreasonable hydraulic system design, incorrect installation gap, the quality of hydraulic components, improper selection of seals, etc., the hydraulic system failure caused by these problems generally has nothing to do with the hydraulic oil.

The two is the hydraulic system failure caused by operational errors, which refers to the hydraulic system in normal operation due to improper operation caused by the error, such as opening and closing the valve, a sudden interruption of power supply, the operating temperature or pressure is too high, when the wrong fill oil oil tank oil level is too high or too low, not timely release from the tank at the bottom of the separation water etc.. The hydraulic system failure caused by operation error is not caused by the quality of hydraulic oil, most of which do not involve hydraulic oil, but some can be reflected from the change of the quality of hydraulic oil.

Three is due to the quality of hydraulic oil hydraulic system failure, which is mostly due to improper selection of oil or the use of substandard oil, it may also be hydraulic oil use time is too long, not timely replacement of new oil caused.

Specific performance of fault:

The influence of air mixed into hydraulic oil

The pressure of the hydraulic system is unstable or insufficient

Automatic shutdown of hydraulic oil system with too high oil temperature

The replacement of hydraulic oil and the cleaning of hydraulic system

Influence of water inflow in hydraulic system

Particle pollution in hydraulic system

Mixing other oil in hydraulic system

The hydraulic oil will be deteriorated in use, continue to use the change of the quality of hydraulic oil will cause the hydraulic system work is not normal, parts wear and corrosion, serious will cause serious accidents. On the contrary, if the hydraulic oil has not deteriorated, it will not only cause waste, but also need to stop oil change, increase unnecessary expenses. Therefore, it is an important means to protect the equipment and reduce the cost to understand the quality status of hydraulic oil in use and replace it timely when obvious deterioration occurs. The deterioration of hydraulic oil includes the change of composition and property of oil, mainly the oxidation deterioration of hydraulic oil, the volatilization of light fraction, the loss of additive and the pollution of oil, etc. all of these will make the performance of hydraulic oil change and affect the normal use.

In order to correctly control the replacement time of oil products in use, China has formulated the national standards and industry standards for various types of lube oil change indicators.