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Test items and significance for hydraulic guide oil

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Test items and significance for hydraulic guide oil

Date of release:2017-11-28 Author: Click:

Viscosity and viscosity-temperature properties


 


Viscosity is the main indicator of hydraulic oil, the system has a significant impact on the smooth work. Viscosity is too small, the lubrication surface is prone to wear and tear, so that the hydraulic components of the internal leakage and leakage increase, pump volume efficiency decreases, the oil temperature rise. The viscosity is too large, the pump oil is difficult, the flow of energy loss increases, the system heat increases, the oil temperature also increased. Therefore, it must have a suitable viscosity. In most cases, the hydraulic fluid is generally 40 ° C kinematic viscosity 11.0-60.0mm2 / s. As the construction machinery is generally open-air work, the oil temperature changes with temperature changes, so in order to ensure the stable operation of the hydraulic system, the greater the viscosity index of the oil as possible. General anti-wear hydraulic oil viscosity index requirements of not less than 90, low temperature hydraulic oil not less than 130.


 


2 low temperature


 


The low temperature of hydraulic oil includes three aspects:


 


(1) low temperature fluidity; (2) low temperature startability; (3) low temperature pumpability. The latter two properties are mainly related to the viscosity of oil at low temperature. Therefore, a variety of hydraulic pump manufacturers on the delivery of the hydraulic pump provisions of the starting oil hydraulic cold start viscosity.


 


3 oxidation stability


 


Hydraulic oil requires good oxidation stability, in order to reduce the oxidative deterioration of acidic substances and sediments on the hydraulic equipment have a negative impact, and to extend the oil change period. It is usually required that the acid value reach 2 mgKOH / g for a period of not less than 100 hours.


 


4 rust and corrosion resistance


 


Hydraulic system in operation, it is inevitable to be mixed with some air and water, the air and moisture can cause corrosion of metal surfaces, affecting the accuracy of hydraulic components. On the other hand, rust particles fall off and cause wear. At the same time, rust particles are oxidative deterioration of oil catalyst. Therefore, hydraulic oil is required to have good anti-rust and anti-corrosion properties to ensure that the hydraulic transmission system for a long time normal operation.


 


5 abrasion resistance


 


In hydraulic systems pumps and high-power oil motors are the main moving parts. In the start-up and parking may often be border lubrication. In this case, if the lubricating oil is poor in lubricity and poor in abrasion resistance, sticking wear, abrasive wear, and fatigue wear occur, causing the performance of the pump and the oil motor to be degraded, the life of the pump shortened, and the system malfunctioning. Therefore, a certain amount of antiwear and extreme pressure additives are often added to hydraulic fluids. Like dialkyldithiophosphate zinc, in order to improve the oil abrasion resistance and extreme pressure performance, to meet the lubrication requirements.


 


6 Shear stability


 


Under the conditions of high pressure and high speed, the hydraulic oil under severe working conditions, such as pumps, valves and micropores, undergoes severe shearing action, causing the viscosity index improver in the oil molecules to be broken and the oil viscosity to drop. When oil Viscosity down to a certain extent, it can not continue to use. Therefore, hydraulic oil is required to have good shear stability.


 


7 demulsification and hydrolytic stability


 


Oil that has been mixed with water during operation of the hydraulic system can easily form an emulsion with water under the severe agitation of adjusting devices, pumps and other components, thereby destroying the original properties of the oil, causing rusting of the hydraulic components, and abrasive wear and the like Bad consequences, so the hydraulic oil requires good demulsification and hydrolytic stability.


 


8 anti-foam and air release


 


Anti-foam and air release is one of the important performance of hydraulic oil. Mixed with air hydraulic oil at work will make the system less efficient, poor lubrication conditions. In addition, it can also result in under-pressure in the drive system and slow operation of the drive. Severe abnormal noise, cavitation, vibration, etc., and even damage equipment. No anti-foam hydraulic oil foam in the run-time, entrained air, can not meet the requirements, so the use of anti-foam agent. Traditionally, the use of methyl silicone antifoam has been found to be particularly effective in eliminating foam on the surface of the oil, but it inhibits the rise and release of small bubbles in the oil. In recent years, people use polyester non-silicone anti-foam agent. It can not only solve the elimination of oil surface foam, but also has little effect on the rise and release of small bubbles in oil.


 


9 Filtering


 


Means the hydraulic oil does not clog the filter, the ability to filter. As the modern hydraulic system toward the small size, high pressure, high speed, high flow and automation direction, a variety of hydraulic components put forward more stringent requirements. Mainly for the high precision, small pump clearance and control components are complicated. Tests have shown that as long as the presence of small particles of impurities that will cause wear and tear of equipment. Therefore, installing a filter in the hydraulic system and requiring the hydraulic oil to have good filterability.


 


10 and flexible seals, coatings and other non-metallic materials and metal materials have good adaptability


 


Adaptability refers to the hydraulic oil on its contact with a variety of metal materials, non-metallic materials such as rubber, paint, plastics and other non-erosion effect. Conversely, these materials will not spoil the oil.


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