Prior to lowering the top drive system or rigging down, ensure that sufficient wraps of drilling line remain on the drum.
在下放或拆卸顶驱系统之前，要保证辊筒上留有足够的大绳圈数。
In view of this, author launched the design and research in a full-hydraulic top drive drilling system.
鉴于此，笔者开展了全液压顶部驱动钻井系统的设计与研究。
The top drive drilling system, divided into electrical top drive and hydraulic top drive.
顶部驱动钻井装置，分为电驱动顶驱和液压驱动顶驱。
Therefore we add the probe of touch system with position measure in the drive to measure the position of the top of the cylinder.
故在驱动装置上增加触发式位置检测探头用于测量缸体顶面位置。
Comparative Analysis of Electric drive top drive drilling system and hydraulic driven top drive drilling system.
对比分析电驱动顶驱和液压驱动顶驱。
Comparative Analysis of Electric drive top drive drilling system and hydraulic driven top drive drilling system.
对比分析电驱动顶驱和液压驱动顶驱。
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