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冲击回转钻进时,岩粉不能全部从炮眼中排出。岩粉被挤压在炮眼壁和钻杆上,因此钻进速度减低。
Impact rotary drilling, rock dust can not be completely discharged from the hole. Rock dust is squeezed on the borehole wall and the drill pipe, so the drilling speed is reduced.