The micro motion drive unit is a highly refined screw-driven hydraulic jack.
微形传动装置是一个极精制的螺杆用液压作动筒。
However, the study in the hydraulic top drive only used in the service machine, poor-boy rig, also there have no research on deep and ultra-deep series of hydraulic top drive unit in China.
然而，对液压顶驱的研究，还停留在修井机、和浅井钻机上。国内目前还没有深井和超深井系列的液压顶驱装置。
A coupler drive system for pumping unit is developed by using the theory of hydraulic drive of coupler.
运用耦合器液力传动原理，研制成功抽油机耦合器传动系统。
Each grinding roller is composed of fixed rock arms, frame and hydraulic pressure system, which is the drive unit.
每一个磨辊，它都是由固定的摇臂、安装摇臂的支架，以及液压系统组成了粉磨的动力单元。
Each grinding roller is composed of fixed rock arms, frame and hydraulic pressure system, which is the drive unit.
每一个磨辊，它都是由固定的摇臂、安装摇臂的支架，以及液压系统组成了粉磨的动力单元。
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