Currently, the DTH RIGS use generally a percussion rotarypenetration sys-tem to generate the rotating torque that produces a shearing action for breaking rock.
目前，潜孔钻机普遍采用冲击回转凿入系统，用以产生回转力矩，对岩石产生剪切作用而成颗粒分离。
2
This paper uses a new rotarypenetration instrument independently developed by Xi'an University of Technology, it shows a unique advantage in soft rock and other hard material layer.
运用西安理工大学自主研发的新型旋转触探仪，针对软岩等硬质地层进行旋转触探试验，显示了独特的优越性。
3
Mechanical rock breaking is the main function of modern rotary drilling. The purpose of jet aided mechanical rock breaking is to improve the penetration rate.