多层采空区钻探用GQ-142贯通式潜孔锤研制及试验
甘心1,2, 殷琨1,2, 李鹏1,2, 罗永江1,2

Development and test of GQ-142 hollow-through DTH air hammer used in multilayer goaf drilling
GAN Xin1,2, YIN Kun1,2, LI Peng1,2, LUO Yong-jiang1,2
GQ-142贯通式潜孔锤内部结构简图