As the working medium of the hydraulic system, the viscosity, viscosity-temperature characteristics and cleanliness of hydraulic oil directly affect the reliability and service life of the hydraulic block making machine. Improper selection will affect the normal operation of the equipment, leading to premature wear of components, resulting in greater economy loss. There are many types of hydraulic oils on the market, such as Mobil hydraulic oil, Shell hydraulic oil, Great Wall hydraulic oil, Kunlun hydraulic oil, etc., which are divided into high-zinc anti-wear hydraulic oil, low-zinc anti-wear hydraulic oil, ash-free anti-wear hydraulic oil and Anti-wear hydraulic oil, grinding hydraulic oil, high-pressure anti-wear hydraulic oil, ultra-high anti-wear hydraulic oil, etc. Faced with so many brands and models, how should we choose?
1. Proper viscosity
The viscosity is too small, the hydraulic system leakage increases, the volumetric efficiency of the hydraulic pump decreases, the viscosity increases the movement resistance, the system pressure drop, and the temperature rise may cause "cavitation" at the suction end of the main pump;
2. Gigh viscosity index
Hydraulic machine runs continuously, the working load is large, and the system oil temperature changes greatly with load and ambient temperature. The hydraulic oil should have better viscosity-temperature characteristics, that is, the viscosity index should be higher;
3. Good lubricity
Reduce the wear between the moving surfaces of the parts and ensure the service life of the hydraulic brick machine;
4. Good stability
When the oil temperature rises by about 10°C, the chemical reaction rate doubles. The high chemical stability of hydraulic oil ensures that it is not easy to oxidize and deteriorate during storage and use;
5. Good foam resistance
After bubbles appear in the liquid, as the compression ratio increases, the hydraulic components move slowly, causing hydraulic shock and creep;
6.Low pour point, high flash point
Ensure the low temperature fluidity and high temperature of the oil.
Only the hydraulic oil that meets the above requirements can be used on our hydraulic brick machine to ensure the operating performance of the equipment, but the selected hydraulic oil also needs to be replaced and maintained regularly. Generally, our manufacturer recommends that the hydraulic The hydraulic oil of the brick machine is filtered and replaced.
