The causes of using traditional wet drilling difficultly are analysed. And the wet drilling method of the coal electric drill of external spray hydroelectric interlock is related.
分析了传统湿式打眼难以推广应用的原因，叙述了外喷雾水电联锁煤电钻湿式打眼法。
2
Triple interlock of mechanic, electric and hydraulic devices.
机械、电器、液压三重连锁安全保护功能。
3
Inspect the electric motor protection, control and interlock if they are right.