选择具有典型特性的系统部件，构成系统，模拟主油泵与交流油泵切换过程，分析其系统特性。
Choose the typical equipments and make them into one system model, simulate the switching process between the main oil pump and the AC oil pump, then analyse it's characteristic.
本文提出了利用先进的交流变频调速技术改变油泵转速的容积调速新方法，较好地解决了传统液压调速系统存在的上述问题。
In this paper a new way through changing pump's rotate speed to change its output flux is introduced, which could solve the defects in the traditional hydraulic pressure servo control system.
介绍了对油泵机缸体铝锰合金铸造件缺陷补焊修复的技术工艺，且弥补了若采用交流氩弧焊和气焊施焊时存在的不足。
This paper introduces the repair welding procedure for repairing an alumal casting piece of an oil pump cylinder, This method covers the shortages of AC argon arc weld and gas welding.
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