Most rotating chassis and winch (or hoist) systems of domestic drill rigs are driven by hydraulic transmission in the 90's.
90年代以来，国内研究制造的大扭矩转盘式工程钻机基本上都采用液压传动方式驱动转盘和卷扬（或提升）系统。
This structure make sure s the winch turns clockwise.
绞盘脚下有这个装置，令其只能顺时针转动。
This structure make sure s the winch turns clockwise.
绞盘脚下有这个装置，令其只能顺时针转动。
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