卸掉卸扣器，下放钻柱让钻头缓慢通过转盘。
Remove breaker and carefully lower bit through rotary table.
卡扣式布水器结构，布水均匀。
卡扣式布水器结构，布水均匀，漩涡冲洗，便捷操作。
Card buckle type water distribution device structure, uniform water distribution, whirlpool, convenient operation.
卡扣式布水器结构，布水均匀，漩涡冲洗，便捷操作。
Card buckle type water distribution device structure, uniform water distribution, whirlpool, convenient operation.
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