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伸缩臂液压挖掘机普通的液压挖掘机都有一个共同的特点，即动臂与斗杆铰接，挖掘范围受动臂与斗杆的限制。美国Gradall公司多年来生产一种独特的伸缩臂液压挖掘机。这种液压挖掘机有如下特点：1．生产率高高压液压系统使这种挖掘机的生产率比普通挖掘机高一倍，可靠性也高，而?
Telescopic Hydraulic Excavators Common hydraulic excavators have a common feature in that the boom is articulated with the stick and the excavation range is limited by the boom and stick. Gradall Corporation of America has produced a unique telescopic hydraulic excavator for many years. This hydraulic excavator has the following characteristics: 1. The high productivity and high pressure hydraulic system makes the productivity of such an excavator twice as high as that of an ordinary excavator, and the reliability is also high.