Based on the analysis to close loop hydraulic system of hydraulic hammer, this paper provides on open loop hydraulic system.

本文对液压锤使用的闭式液压系统性能进行了分析，在此基础上提出了泵直接传动的开式液压系统。

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With the help of the method, the control accuracy similar to that of close loop system can be obtained and the system has the same stability as that of open loop system.

采用这种控制方式，可以获得类似闭环系统的控制精度和开环系统的稳定性。

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The physic layer and the software layer of the open NC system's layering and modeling design, the characteristic and the open characteristic of CJK6132A lathe Close loop NC system are introduced.

对开放式数控系统进行层次模块化设计：物理层、软件层设计。介绍了CJK6 132A车床闭环数控系统的特点及开放性。

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