后胀成圆管 ,孔内积水由膨胀软管与炮孔壁之间的环状套排出孔外。孔内积水快排完时 ,压气在环状水套继续膨胀 ,高速上喷 ,把残存的泥水雾化
Cloth hose is dragged into the accumulated water of explosive hole afte r drilling the hole. The air is compressed into the hose and make it to become a circular tube. The accumulated water of hole is drained away through the cyclic sheath between expansive hose and explosive hole wall. At last, the compressed air in the cyclic sheath expand continuously and spray upward in high speed ,the remnant mud-water is drained away by atomization.