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随着露天矿生产规模的扩大,矿用挖掘机的斗容和机重也越采越大,如苏联ЭКГ-20型为20米~3,1059吨,美国哈尼斯费格公司的P&H5700型为40米~3,1492吨。尽管如此,机械式挖掘机总有一些不足之处。它不能分层开挖,只能各层同时作近似弧形的开挖,对于爆破后留下的大块处理能力很低,而且机器本身传动部件多,重量大,占地多。与此相反,液压挖掘机却有着很多明显的优点。它克服了机械式挖掘机的上述不足之处,还兼有前端式装载载机的某些优点。它既
With the expansion of the scale of open-pit mines, the bucket capacity and weight of mining excavators have also increased. For example, the Soviet Union’s ЭКГ-20 type is between 20 and 3,1059 tons. The H & S Ferguson P & H 5700 model of the United States is 40 meters to 3,1492 tons. However, mechanical excavators always have some shortcomings. It can not be stratified excavation, only all levels at the same time for the approximate arc of excavation, the blast left after the block processing capacity is very low, and the machine itself more transmission parts, heavy, covering more. In contrast, hydraulic excavators have many obvious advantages. It overcomes the above shortcomings of mechanical excavators, and also has some advantages of front-end loader. It is both