When we install the ordinary hydraulic parts into the construction machinery for use, we will find that the ordinary hydraulic parts will soon appear failure or scrap, why?

This is because the construction machinery condition is more special decision. Construction machinery hydraulic parts and ordinary hydraulic parts compared with the following characteristics: design must be paid attention to, otherwise, you design the hydraulic parts is ordinary hydraulic parts, can not meet the requirements of construction machinery.

1, the prime mover is the engine, rather than the motor, therefore, the speed range is very large, generally from 600 to 2500rpm non-stop change, or even higher. The requirements of the hydraulic pump connected to it must be adapted, and ensure that the normal work.

2. Poor working conditions. Construction machinery is generally in the outdoor work, therefore, the wind and rain, environmental pollution is serious. This for the hydraulic medium, the requirements of the tank sealing good, strictly prevent hydraulic medium pollution; For hydraulic parts, not only the friction pair of moving parts is required to have good wear resistance, even for its anti-corrosion performance should be considered; And it is necessary to consider appropriate and effective protective measures for the sports part; To improve the reliability and service life of hydraulic valves.

3. Small oil tank and high oil temperature. The medium temperature of the hydraulic system is high, which is harmful to the hydraulic system and its components.

For example, high temperature can accelerate the deterioration of the hydraulic medium and form carbon deposition, which will aggravate the wear and tear of the hydraulic parts and endanger the life and reliability of the hydraulic parts. High temperature makes the hydraulic seal lose its sealing performance due to accelerated aging. High temperature makes the hydraulic medium viscosity reduces and increases the leakage quantity and so on.

Therefore, the design of the hydraulic medium temperature must be strictly controlled. Construction machinery due to space constraints, the fuel tank is generally very small, therefore, the heat dissipation performance of the fuel tank is poor, leading to high temperature hydraulic medium.

4. Severe pressure change and large hydraulic impact. Common hydraulic system pressure is relatively stable, therefore, the hydraulic impact is relatively small. But when the construction machinery works, because the external load changes many, causes the hydraulic system pressure to change impermanently, often can form the very big hydraulic pressure impact. This has a serious impact on the life and reliability of hydraulic components.

For example, for the hydraulic valve, can make the hydraulic valve valve body crack; Bending the hydraulic spool; Make pipe burst or joint thread vibrate loose even seal be cut etc. These problems not only put forward higher requirements on the material, but also put forward high challenges to the product design structure. We must attach importance to the design of hydraulic valves.

5. Overloading. The execution components of construction machinery generally have a relatively large radial load deviation. For example, the hydraulic cylinder under partial load will cause leakage, jitter and strain and other serious problems.

6. Small volume, large flow and light weight are required for hydraulic components. As construction machinery is generally walking machinery, so the space is very limited, it is particularly important to save occupied area, convenient installation. This is also the construction machinery should be used more multi - valve reason.

Therefore, we must consider casting runner to ensure maximum flow; According to the pressure grade, the hydraulic parts with thin wall, enough strength, smallest volume and lightest weight must be designed to meet the special requirements of construction machinery. If conditions permit, may also consider the use of lightweight materials, such as: aluminum alloy valve body, aluminum alloy or engineering plastic spool and so on.

7. Good control performance. That is, the hydraulic components can be stable, accurate, fast implementation of effective control.

8, hydraulic valve life and reliability. As a result of the above reasons, construction machinery to its use of the hydraulic parts have relatively high requirements, such as: impact resistance, wear resistance, corrosion resistance, high temperature resistance, small and lightweight and so on.

This is designed to ensure the life and reliability of the main engine. If we can accurately predict the life of the hydraulic parts and its reliability, then the life of the hydraulic parts and its reliability is equal to the life of the host and its reliability is undoubtedly the best choice.

But, as of now, that prediction is not quite right. Therefore, in general, in order to ensure the life of the main engine and its reliability, are selected hydraulic life and its reliability is greater than the life of the main engine and its reliability. This puts forward higher requirements for hydraulic components.

In fact, the life and reliability of the product is also the ultimate design goal of our r & d personnel. This puts forward very high requirements for the quality of r & d personnel, that is, not only in the level of imitation, but also need to be innovative design.