除表土外,我国大部分露天煤矿的褐煤和岩石,对斗轮挖掘机而言,属于硬岩范围。斗轮挖掘机挖掘较硬岩石的关键在于斗轮工作装置设计是否合理和机械强度是否可靠。斗轮的外载荷是设计的前提条件,煤岩切割阻力是外载荷中最主要的部分。 Except for topsoil, the lignite and rock of most open-pit coal mines in our country belong to the scope of hard rock for bucket-wheel excavators. The key to bucket wheel excavator excavating hard rock is whether bucket wheel working device design is reasonable and mechanical strength is reliable. Outside the bucket wheel load is a prerequisite for design, cutting resistance of coal rock is the most important part of the external load.