top drive

基本解釋

Prior to lowering the top drive system or rigging down, ensure that sufficient wraps of drilling line remain on the drum.
在下放或拆卸頂驅(qū)系統(tǒng)之前，要保證輥筒上留有足夠的大繩圈數(shù)。
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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.
司鉆慢慢的上提游動滑車或頂驅(qū)，由井架工或一個鉆工把懸吊繩摘掉，把它綁回原處。
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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 .
對液壓頂驅(qū)進行了總體設計，討論了馬達、泵等的選擇，減速箱的設計方案與布局，剎車制動能量回收等。
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Position drive on top of the DVD drive.
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