工作原理与普通的液压油缸基本相似，拿一个手动千斤顶来说，千斤顶其实也就是个最简单的油缸了。
The working principle is similar to that of the ordinary hydraulic cylinder, with a manual jack, Jack is also the simplest oil cylinder.
推进油缸靠在工作面输送镏槽上，它的位置是通过支架的推进油缸的推进力来保持不变，作用在支架的两边。
The advancing ram acts against the face conveyor panline, whose position is held unchanged by the advancing rams, forces of the supports that are set on both sides of the support to be advanced.
叙述了油缸的组成及工作原理，较系统地计算了油缸主要零件的参数并对其进行了相应的验算。
Narrating cylinder's composition and working principle, systematic calculate mostly part's parameter of the cylinder and making corresponding checking computation.
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