It is special important meaning that Deep - hole blasting With bottom Gap Charging is used to protect bottom rock from breaking, to decrease block ratio and to improve blasting efficiency.
深孔爆破孔底空隙装药在有效地保护底板岩层免遭破坏，减少大块率，提高爆破效率等方面均具有重要的意义。
2
Filler must be well filled in order to minimize the gap, good contact between a single block of stone, as much as possible to fill in tight, stone cage to reduce the possibility of moving the stone.
填料必须填写，以减少差距，一块石头之间的良好接触，尽可能填写紧，石笼减少搬石头的可能性。
3
Magnetic working substance area is circular arc with certain radial thickness, and has certain gap with stator permanent magnetism block.