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对锻造设备中所应用到的高压大流量液压系统在设计过程中因液体可压缩性所产生的影响进行了论述,得出实际需要的流量要大于在空行程过程中的流量,在本文的实例中此数值相差高达30%以上。此外,通过阐述油液可压缩性对卸荷冲击的影响,得出在通过固定节流孔时流量和时间成线性关系,可以用来指导卸荷阀通径的选择。针对高压大流量液压系统,分析了入口节流、出口节流和溢流节流3种液压缸运动控制方式,阐明了不同的控制方式对系统的能量消耗、控制精度以及造价的影响。
The influence of liquid compressibility in the design process of high pressure and large flow hydraulic system used in forging equipment is discussed. The actual required flow rate is greater than the flow rate during the idle stroke. In this paper, The difference in this value up to 30% or more. In addition, by explaining the influence of oil compressibility on unloading shock, it is concluded that the flow rate and time become a linear relationship when passing through the fixed orifice, which can be used to guide the choice of the unloading valve diameter. In view of the high pressure and high flow hydraulic system, the motion control modes of inlet, outlet and overflow throttles were analyzed. The influence of different control modes on system energy consumption, control precision and cost was analyzed.