Concrete pump hydraulic system

Concrete pump hydraulic system for hydraulic oil performance requirements Viscosity 1, hydraulic oil Hydraulic oil has a viscosity in the flow process. This ensures a continuous flow of viscous oil to ensure that the oil pressure and flow rate, as well as the hydraulic oil for lubrication, sealing, cooling, rust and so on. However, different hydraulic systems and different working conditions, the viscous fluid has different requirements. Size hydraulic oil viscosity is portable industrial 1 cubic metersconcrete cement mixer for sale expressed by viscosity. In general, a suitable hydraulic fluid viscosity enables excellent oil absorption capacity, can reduce the pressure loss of the hydraulic system, enables the friction has a good lubrication, thus requiring hydraulic oil pressure, temperature and shear under the action of force, viscosity change is small. 2, hydraulic fluid compressibility In the study of static characteristics of the hydraulic system, generally it can be considered hydraulic oil is incompressible liquid. But one important factor when considering the dynamic characteristics of the hydraulic system, such as instantaneous dynamic response of the servo system, the compressibility of the hydraulic oil is affecting the dynamic characteristics. 3, the hydraulic oil lubrication In order to reduce power losses and improve the performance of the hydraulic system, the hydraulic friction element having good lubricating properties is necessary. Hydraulic oil lubrication is a prerequisite to prevent hydraulic components gripping and dry friction phenomena. In addition, the hydraulic pump and fluid at startup, hydraulic oil lubrication adequacy great impact on its performance characteristics start. 4, hydraulic oil stability As the hydraulic oil contains small amounts of water, while inevitably brought into contact with the air, and therefore the hydraulic system under high pressure, high temperature operating conditions, the hydraulic oil china made small cement mixer prices mini mobile concrete mixer temperature increases due to oxidation, hydrolysis and so on, so that the oil generated corrosive substances. This corrosive substances can clog the filter device, the filter performance of the system decreases. Therefore the hydraulic system expects its oil has antioxidant and anti-hydrolysis stability, the system in the amount of corrosion harmful substances generated as small as possible in order to extend the service life of hydraulic oil. 5, hydraulic oil rust and corrosion In the role of water and air, hydraulic components, metal surface rust and corrosion will occur. Rust and corrosion particles generated in the hydraulic system circulation, causing wear of moving surface, the hydraulic system failure. Thus requiring hydraulic oil has strong rust resistance and corrosion resistance, the metal surface does not rust, no corrosion. 6, hydraulic oil defoaming Hydraulic oil contains small amounts of air bubbles and foam will make the oil. This bubble and foam hydraulic system will produce vibration and noise, so that system performance dramatically. Therefore, the requirements of the hydraulic system of hydraulic oil to produce bubbles and foam as little as possible, and disappeared quickly. 7, hydraulic oil demulsibility Since the hydraulic oil in the course of their work will mix a small amount of water, aqueous hydraulic oil under vigorous stirring at high speed produces emulsion. Hydraulic oil emulsion occurs, will produce precipitation, high efficiency volumetric skid steer concrete and cement mixer or generate additional precipitate, which is very harmful to the hydraulic system. Thus, hydraulic oil have a good anti-emulsifying properties, and the oil and water easily separated. 8, the hydraulic oil compatibility Long hydraulic oil in contact with the seal or hose, and seals and hoses mostly made of a rubber material, it is desirable hydraulic oil with the rubber material has good compatibility. Namely hydraulic oil seals and hoses metamorphism can not afford to make seals and hoses as far as possible without distortion, not bad. 9, anti-flammable hydraulic oil Hydraulic oil should have a high flash point, low volatility performance, good fire resistance, the hydraulic system to ensure safety in high temperature conditions