crown block

基本解釋

To replace the drilling line wrapped around the crown block and traveling block.
爲(wèi)更換纏繞在天車和遊動滑車周圍的鑽井鋼絲繩用。
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The drilling line is reeled over the crown block and traveling block to gain mechanical advantage in a "block and tackle" or "pulley" fashion.
鑽井用鋼絲繩通過天車和遊動滑車以滑輪組的形式獲得機(jī)械上傚益。
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The text detailedly introduced crown block, running system, availability work period of bridge girder erection equipment and improve case for precast beams install.
詳細(xì)介紹了對雙導(dǎo)梁式架橋機(jī)天車、行走系統(tǒng)、有傚工作長度及預(yù)制梁安裝就位的改進(jìn)情況。

Strongly influenced behind the scenes by the Crown family of Chicago, which owned a controlling block of shares, the company sold off most of its military businesses when the Cold War ended in the biggest fire sale the defense sector had ever seen.
FORBES: General Dynamics Begins 2013 With New Leader, Changing Business Mix