内燃凿岩机是用来直接开采石料的工具。它在岩层上钻凿出炮眼，以便放入炸药去炸开岩石，从而完成开采石料或其它石方工程。此外，凿岩机也可改作破坏器，用来破碎混凝土之类的坚硬层。
针对当前单缸手持式内燃凿岩机深孔凿岩存在的问题，研制了YNF30型带副缸式内燃凿岩机。
YNF30 jackdrill with caunter-cylinder is developed with the aim at resolving the problem existing in the deep-hole drilling by single-cylinder hand diesel jackdrill.
此外，本文还介绍了当前难于测量而又有意义的一些参数的计算结果，为揭示内燃凿岩机的工作机理和性能改进提供了重要信息。
Besides, some parameters, very difficult to be measured, were also given out by the model. It could be served as important informations...
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