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WUD400/700型斗轮挖掘机的液压系统中,采用了ZBSV-75型变量柱塞泵,由于斗轮机各工作机构的速度改变频繁,如平台回转机构的速度就要随着斗轮臂的回摆角度的变化而变化(即通常所说的1/cos的调速),而且速度变化范围还很大。这就要求不断改变泵的流量以适应工况的要求。又如斗轮臂的变幅缸,缸径、行程都很大,当斗轮挖完工作面底层后需要快速提升,此时要求有大的提升速度以节省空载运转时间,而在正常挖掘过程中为了控
In the hydraulic system of WUD400/700 bucket wheel excavator, ZBSV-75 type variable displacement plunger pump is adopted. Since the speed of each working mechanism of the bucket wheel machine changes frequently, the speed of the platform swing mechanism must follow the back of the bucket wheel arm. The change in the angle of the pendulum changes (the so-called 1/cos speed regulation), and the range of speed change is still large. This requires continuously changing the flow of the pump to meet the requirements of working conditions. Another example is the width of the bucket arm, cylinder bore, stroke are large, when the bucket wheel digging the bottom of the working face after the need to quickly upgrade, this time requires a large lifting speed to save no-load running time, and in the normal excavation process In order to control