If the hydraulic system is compared to the body of the human body, then the hydraulic oil concentrate is comparable to the human blood. In the hydraulic system, the hydraulic oil plays the role of energy transfer, system lubrication, corrosion prevention, rust prevention, cooling, etc. Whether the hydraulic system can work effectively depends on the variety and viscosity of the hydraulic oil selected. Therefore, it is very necessary to know the performance of hydraulic oil concentrate and select it correctly.
I. Hydraulic oil code, Composition and Characteristics: HL general machine tool oil, refined mineral lubricating oil with anti-rust and anti-oxidation properties HM anti-wear hydraulic oil, refined mineral lubricating oil with anti-rust, anti-oxidation and anti-wear properties HV low-temperature hydraulic oil, refined mineral lubricating oil with anti-rust, anti-oxidation and anti-wear properties HG hydraulic guide oil with thickening agent, With anti-rust, anti-oxidation, anti-wear and anti-slip properties of refined mineral lubricating oil HS synthetic hydrocarbon low temperature hydraulic oil, with anti-rust, anti-oxidation, anti-wear properties of synthetic hydrocarbon oil
Ii. Selection of hydraulic oil concentrate
1. Choose according to the working pressure of the hydraulic system. Different working pressures have different requirements on the quality of hydraulic oil. The increase of system working pressure requires that the anti-wear, anti-oxidation, anti-foam, anti-emulsification and hydrolytic stability of hydraulic oil should also be improved. At the same time, in order to prevent the increase of pressure caused by leakage, the viscosity of hydraulic oil should also be increased accordingly; On the contrary, choose low viscosity hydraulic oil.
2, according to the use of ambient temperature selection. In the environment temperature is high or close to the heat source of machinery, should be preferred to choose high viscosity temperature (viscosity of oil changes with the temperature, that is, viscosity-temperature) oil or non-combustible oil. In bad working conditions, in order to ensure the safety and reliability of the system, viscosity-temperature characteristics, thermal stability, lubrication and corrosion prevention and other good performance of the oil.
3, according to the sealing material selection. The sealing material of hydraulic device is compatible with the oil used by the system. Otherwise, the sealing parts will expand, shrink, erode, dissolve and other phenomena, resulting in the deterioration of system performance. For example, HM anti-wear hydraulic oil is poor in compatibility with natural rubber, butyl rubber, vinyl rubber, silicone rubber, etc., which should be paid attention to in actual use.
Three choice of hydraulic oil viscosity
Choose the right viscosity hydraulic oil. High temperature and high pressure system to choose high viscosity hydraulic oil, so as to obtain better lubricity, on the contrary, low temperature and low pressure system, should choose low viscosity hydraulic oil, so as to reduce energy consumption.
Specifically, the viscosity of hydraulic oil concentrate is too high, which is beneficial to lubricity, but increases the resistance and pressure loss of the system, resulting in increased power loss, oil temperature rise, hydraulic instability, noise, etc. Too high viscosity will also cause difficulty in oil absorption when the pump starts at low temperature, and even cause interruption of oil supply when starting at low temperature, resulting in equipment failure. On the contrary, when the viscosity of the hydraulic system is too low, it will increase the internal and external leakage of the hydraulic equipment, and the working pressure of the hydraulic system will be unstable or the pressure will be reduced, which will lead to abnormal wear of the pump.
