Hydraulic system as a modern industry widely used in the important power transmission and control devices, in the actual operation process, inevitably faced with some thorny issues, which is the most prominent when the three major problems.

The first is the heat problem. In the hydraulic system, the transmission medium is usually hydraulic fluid, which in the flow process, due to the inconsistency of the flow rate of each part, resulting in a certain degree of internal friction within the liquid inevitably exists. At the same time, the contact between the liquid and the inner wall of the pipeline will also produce friction. These friction factors are superimposed on each other, becoming the main cause of the gradual increase in the temperature of the hydraulic fluid.

As the temperature continues to rise, a series of negative consequences ensue. Internal and external leakage will be intensified, which will undoubtedly reduce the mechanical efficiency of the entire system. Moreover, under high temperature conditions, the hydraulic fluid expands and its compressibility increases significantly. As a result, the original precise and effective control action is difficult to be transmitted smoothly, thus affecting the normal operation of the system and working accuracy.

It should be noted that heat generation is an inherent characteristic of hydraulic systems that is difficult to eradicate. However, we can minimize its impact through a series of measures. Among them, the selection of high-quality hydraulic fluid is a key link, high-quality hydraulic fluid in the high temperature and friction is often better performance. In the hydraulic piping arrangement planning, should avoid the appearance of elbows to the maximum extent possible, because the elbow will increase the resistance of liquid flow and friction, which exacerbates the heat. In addition, the use of high-quality pipelines, pipe fittings and hydraulic valves and other components, can reduce the quality of components due to their own quality problems caused by energy loss and heat.

Next is the problem of vibration. The vibration of the hydraulic system can be called one of its chronic problems. Hydraulic oil in the pipeline high-speed flow of the impact generated by the impact, as well as the control valve to open and close the moment of the formation of the impact, together constitute the main cause of vibration in the system.

Strong vibration brought about by the harm should not be underestimated. It may not only lead to system control action deviation and error, so that the system can not be in accordance with the preset procedures and requirements for stable operation, but also on the system of some of the more precise instrumentation to cause adverse effects, so that its working accuracy or even malfunction, which led to the operation of the entire system failures, a serious impact on production efficiency and product quality.

In order to effectively solve this problem, in the design and installation of hydraulic piping, it should be firmly fixed as far as possible to avoid unnecessary shaking and vibration. At the same time, to minimize frequent changes in the direction of liquid flow, because each change in direction may bring new shocks and vibrations. If it is not possible to avoid the change of flow direction due to practical needs, it is necessary to do a good job in advance of the perfect vibration damping measures, such as the installation of suitable vibration dampers or the use of flexible connections, etc.. In addition, the entire hydraulic system should be equipped with good damping devices to reduce the transmission and impact of vibration. At the same time, it is also necessary to pay special attention to the interference of external vibration sources on the system, to take effective isolation and shielding measures to ensure that the system operates in a relatively stable environment.

Finally, the leakage problem. Hydraulic system leakage can be divided into two types of internal and external leakage. Internal leakage refers to the leakage process occurs within the system, common such as the leakage of the two sides of the piston of the hydraulic cylinder, control valve spool and valve body leakage, etc.. Although the internal leakage will not directly cause the loss of hydraulic oil, but because of the existence of leakage, the original intended control action may be disturbed and affected, with the aggravation of the degree of leakage, may even cause system failure.

External leakage refers to the leakage that occurs between the system and the external environment. When the hydraulic fluid leaks directly into the external environment, it will not only pollute and damage the working environment of the system, but also lead to a drop in system pressure, unable to reach the pressure level required for normal operation, thus triggering failures. More seriously, the leakage of hydraulic oil into the environment there is a potential risk of fire, bringing great safety risks to the production site.

Solutions to the leakage problem include the use of better quality seals to enhance the sealing effect and reduce the occurrence of leakage. At the same time, improve the processing precision of the equipment to ensure that the cooperation between the various components is tight, no gaps, from the source to reduce the possibility of leakage.

In summary, although the hydraulic system exists in the heat, vibration and leakage of the three major stubborn problems, but through in-depth understanding of its causes, and to take scientific and reasonable measures to solve the problem, we can minimize the adverse effects of these problems, to protect the stability of the hydraulic system, efficient operation.