Engineering machinery hydraulic oil for the selection and use to pay attention to what?       

(1) environmental conditions are mainly environmental temperature;

(2) working conditions: oil pump type, working pressure, temperature, speed, oil and metal, seal and coating adaptability, system operation cycle and work characteristics;

(3) the nature of hydraulic oil: physical and chemical indicators of oil, the use of performance and characteristics;

(4) economy: oil price, service life and so on. ?

After selecting suitable hydraulic oil, it is very important to manage and maintain it in the process of using, and pay attention to the following points.

(1) prevent hydraulic oil from being polluted: the greatest harm to the pollutants is to cause corrosion to the equipment, block the filter and throttle hole, accelerate the aging of the oil and corrosion of the components;

Prevent air mixing: mixing air will produce cavitation, noise, and make the hydraulic oil premature deterioration, affect the use;

Prevent water from mixing: the mixing of cooling water and steam will make the metal corrosion in the hydraulic system, accelerate the deterioration of the oil, and reduce the lubricity of the hydraulic oil

The control of the hydraulic oil temperature of hydraulic oil, mineral oil, at 50 ~ 65 C of continuous work, the highest use temperature at 120 ~ 140 C. The increase of oil temperature will accelerate the oxidation deterioration of hydraulic oil, and the oxidation of acidic substances will lead to corrosion of metal components.

1, select the basis of liquid oil for construction machinery

The hydraulic components of hydraulic components, different has a minimum configuration requirements for hydraulic oil, hydraulic oil, therefore, should pay attention to the compatibility of hydraulic type and material of seal and paint or paint with hydraulic oil, ensure the lubrication is good, the components meet the design life. Used to meet the requirements of performance.

The hydraulic pump is one of the most sensitive components to the viscosity and viscosity temperature of hydraulic oil. Therefore, the requirement of hydraulic oil in the system is the important basis for selecting the hydraulic oil (except the servo valve system).

(2) the higher the requirement of the actuator speed, the system pressure and the accuracy of the mechanism action, the higher the requirements of the hydraulic fluid on the wear resistance and carrying capacity.

According to the possible working temperature of the system, the continuous running time and the sanitary conditions of the working environment, the viscosity, high temperature performance and thermal stability of the oil must be paid attention to in order to reduce the formation and deposition of oily sludge.

The smaller the tank size, the smaller the fuel tank, the higher the requirements of the antioxidant safety, extreme pressure and anti-wear, air release and filtration.

The ambient temperature for the construction machinery in the underground water, indoor and outdoor, cold, or in the temperature change of the cold area, and there is no heat or open flame near the high temperature environment such as temperature characteristics, reasonable selection of hydraulic oil. If there is no open flame, the working temperature is below 60 degrees, and the load is light, the ordinary hydraulic oil can be selected. If the equipment must be started at a very low temperature, the low condensate hydraulic oil must be selected.

In summary, if the quality of the hydraulic oil standard, actuator movement speed is very high, the oil flow rate is high, the hydraulic loss increases, and the leakage is relatively reduced, so it should choose a lower viscosity oil; on the other hand, when the oil flow rate is low, the leakage increases relatively, will affect the movement speed, it is advised to choose a higher viscosity oil. Usually, when the working pressure is high, the hydraulic oil with high viscosity should be chosen, because the leakage problem in solving high pressure is better than that of overcoming the viscous resistance, and the low viscosity oil should be chosen when the working pressure is low. When the ambient temperature is high, the oil with higher viscosity should be used, otherwise, the oil with lower viscosity should be adopted.

The hydraulic oil, hydraulic oil and finally determine the preliminary selection, it is necessary to pay attention to check the supply, viscosity, quality, characteristics, scope of application, and the system and component compatibility of materials, to see whether the index can fully meet the requirements.

The economy, should consider the hydraulic oil price, service life and safe operation and maintenance of hydraulic system and cycle etc., focus on the economic benefits of good brand.