top drive

基本解释

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。
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The driller slowly picks up the traveling block or top drive and the derrikman or a floorman release the dedicated hanging line and tie it back safely away.
司钻慢慢的上提游动滑车或顶驱，由井架工或一个钻工把悬吊绳摘掉，把它绑回原处。
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The overall design for the hydraulic top drive, discussed how to choice the motor, pump, and the design and layout of the gear box, the brake energy recovery and so on .
对液压顶驱进行了总体设计，讨论了马达、泵等的选择，减速箱的设计方案与布局，刹车制动能量回收等。
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Position drive on top of the DVD drive.
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