由于露天采矿的发展趋势是朝着开采大型,低品位矿床的方向发展,因此在钻机设计中的动向之一是设计一种在厚矿层钻眼中能改进性能和提高钻速的大型回转式钻机。但是在世界许多地区,特别是在欧洲,许多采石场和露天矿常常位于困难的山岭地区。在这些地区不仅难以采用非常大型的钻机,而且矿床本身也往往是很小的,因此需要采用一种重量较小和较灵活的钻眼设备。 As the trend of open pit mining is toward the mining of large and low grade deposits, one of the trends in rig design is to design a large rotary drilling rig that can improve performance and increase the rate of penetration while drilling in thick seam. However, in many parts of the world, especially in Europe, many quarries and surface mines are often located in difficult mountain areas. Not only are very difficult to use very large rigs in these areas, but the bed itself is often small, requiring a smaller and more flexible drilling equipment.