It USES drill rod connector to directly connect the drill rods, so that during the drilling work, it dose not require fixing or dismantling any of the other drilling tools on the Kelly.
采用钻杆联接器直接连接钻杆，在钻进工作时不需要在主动钻杆上再装卸其它钻具。
The connecting hub comprises a connector at one end of the hub rod.
连接毂包括在毂柱一端的连接头。
The invention comprises an end closure, a base and a locking mechanism of a connector, and a ball connecting rod connected therewith.
本发明包括：连接器的端盖、底座、锁紧机构和与其连接的球形连接杆。
The invention comprises an end closure, a base and a locking mechanism of a connector, and a ball connecting rod connected therewith.
本发明包括：连接器的端盖、底座、锁紧机构和与其连接的球形连接杆。
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