In this stage, the lifting frame was fixed to a hook attached to a crane, and the hull was lifted completely clear of the seabed and transferred underwater into the lifting cradle.
在这一阶段，吊架固定在吊车的挂钩上，船体完全脱离海床，在水下被转移到吊篮里。
The paper introduces the application of PLC in titanium smelting crane, in particular, the rising up and descending down of main hook by PLc.
介绍了可编程控制器PLC在钛冶炼生产中天车上的应用，主要阐述了利用PLC控制天车主钩的上升下降。
This paper gives detailed and accurate analysis to hook gliding at heavy load for gantry crane with the basic principle of electric haulage.
文章运用电力拖动的基本原理对港口门机生产实际中出现的重载溜钩现象进行了详细准确的分析。
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