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。
Triple interlock of mechanic, electric and hydraulic devices.
机械、电器、液压三重连锁安全保护功能。
Triple interlock of mechanic, electric and hydraulic devices.
机械、电器、液压三重连锁安全保护功能。
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