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为了减轻钻探上、下钻塔的劳动量和减少上、下塔的时间,我们自1960年就开始试用了手摇升降作业台和拽绳升降作业台。这两种作业台的升降,都是靠人力和平衡挂重实现的。其缺点是操作者的体重
In order to reduce the amount of labor required to drill the upper and lower rigs and reduce the time for getting on and off the towers, we have been experimenting with hand-operated lifting tables and reel lifting tables since 1960. The lifting and lowering of these two kinds of worktables is achieved by manpower and balance. The disadvantage is the weight of the operator