冷再生机作为一种施工设备，因此对液压系统方面要求还是比较严格的，比如说液压油在设备中起到的性能要很好，不然很容易就会影响到设备效率。那么冷再生机对液压油性能的要求如何？

As a construction equipment, the cold regenerator has strict requirements on the hydraulic system. For example, the performance of hydraulic oil in the equipment should be very good, otherwise it will easily affect the efficiency of the equipment. So what are the requirements of the cold regenerator for the performance of hydraulic oil?

适当的粘度。粘度是油流动时分子间摩擦阻力的大小。粘度过大时，油液流动阻力大，能量损失大，系统效率降低。此外，冷再生机主机空载损耗增大，温度迅速升高，工作温度高，主泵吸油端易出现“空穴”现象。如果粘度太小，就不能保证液压元件良好的润滑条件，会加剧元件的磨损，增加泄漏，降低液压系统的效率。

Proper viscosity. Viscosity is the amount of frictional resistance between molecules when oil flows. When the viscosity is too large, the oil flow resistance is large, the energy loss is large, and the system efficiency is reduced. In addition, the no-load loss of the main engine of the cold regenerator increases, the temperature rises rapidly, the working temperature is high, and the "hole" phenomenon is easy to appear at the oil suction end of the main pump. If the viscosity is too small, good lubrication conditions of hydraulic components cannot be guaranteed, which will aggravate the wear of components, increase leakage and reduce the efficiency of hydraulic system.

良好的抗磨性和润滑性。目的是减少冷蓄热室的机械摩擦，保证在不同压力、速度和温度条件下有足够的油膜强度。化学反应稳定性高，不易被氧化变质，具有良好抗氧化性和稳定性的液压油在长期使用后不易被氧化变质，可以保证液压油的正常循环。

Good wear resistance and lubricity. The purpose is to reduce the mechanical friction of cold regenerator and ensure sufficient oil film strength under different pressure, speed and temperature conditions. The hydraulic oil with good oxidation resistance and stability is not easy to be oxidized and deteriorated after long-term use, which can ensure the normal circulation of hydraulic oil.

破乳性好，不易起泡。抗乳化性是指油与水混合，搅拌后不成乳状液，并能从中分离出水的能力。消泡是指油与空气混合并搅拌而不形成乳状液的能力和气泡与油分离的能力。与水或空气混合后，液压油的体积模量降低，压缩性增加，液压元件运动缓慢，易产生冲击和振动。

It is not easy to break milk and has poor foaming property. Demulsibility refers to the ability of mixing oil and water, not forming emulsion after stirring, and separating water from it. Defoaming refers to the ability of oil and air to mix and stir without forming emulsion and the ability of bubbles to separate from oil. After mixing with water or air, the bulk modulus of hydraulic oil decreases, the compressibility increases, and the hydraulic components move slowly, which is easy to produce impact and vibration.

良好的粘温特性。粘温特性是指油品的粘度随温度变化的程度，通常用粘度指数来表示。粘度指数越大，液压系统运行过程中油液粘度随温度升高而下降的幅度就越小，这样液压系统的内漏就不会太大。粘度指数一般不应低于90。

Good viscosity temperature characteristics. Viscosity temperature characteristic refers to the degree that the viscosity of oil changes with temperature, which is usually expressed by viscosity index. The larger the viscosity index is, the smaller the decrease of oil viscosity with the increase of temperature during the operation of the hydraulic system, so that the internal leakage of the hydraulic system will not be too large. Generally, the viscosity index shall not be lower than 90.

良好的防锈性能。冷再生机租赁人员认为液压油覆盖在冷再生机机械部件的表面，以防止它们被氧化和生锈。燃点和闪点应符合环境温度，挥发性要小，以保证液压油的。

Good rust resistance. The leasing personnel of the cold regenerator believe that the hydraulic oil covers the surface of the mechanical parts of the cold regenerator to prevent them from being oxidized and rusted. The ignition point and flash point shall meet the ambient temperature and the volatility shall be small to ensure the safety of hydraulic oil.

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