前言近年来由于采矿技术的不断发展,国内外许多坑下金属和非金属矿山相继采用了深孔大量崩矿法,因此大块量增多,二次破碎量增大,为了提高劳动生产率减轻笨重的体力劳动,国内外许多坑下矿山特别是用箕斗或带式运输机的矿山都设置了地下破碎,设置地下破碎优点很多:1、可使回采的矿石块度加大,并可提高回采 Preface In recent years due to the continuous development of mining technology, many domestic and foreign pit metal and non-metallic mines have adopted a large number of deep-hole collapse method, so the bulk increased, secondary crushing increased, in order to improve labor productivity and reduce heavy Manual labor, many domestic and foreign pit mines, especially with skip or belt conveyor mines have set up underground crushing, setting underground broken a lot of advantages: 1, can make the recovery of ore lumps, and can improve the mining