A thrust hydraulic system of shield tunnelling machine with pressure and flow compound control was designed, and hydraulic cylinders were also controlled in groups.
设计了一种基于压力流量复合控制的盾构推进液压系统，对液压缸进行了分组控制。
Achieving twice the thrust of previous cylinders and high space efficiency; the flat and square body is suited to downsize machine and equipment.
实现两倍于以前的气瓶和空间效率高推力平面和方形的身体适合缩小机器和设备。
Mechanical springs used with air cylinders can be sized for up to 20,000 Ibs. of thrust and have a stroke limit of about 14 "max. depending on thrust output required."
空气缸体执行机构所采用的机械弹簧可以达到20,000磅的推力，及最大14英寸的冲程限制，主要取决于所需要的输出推力。
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