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内燃凿岩机从TK－25型发展到东方红——23型，性能有了很大改善。该机在偏僻山区风、电动力源不便的露天地区进行凿岩作业，具有很大优越性。目前在我省已被广泛用于露天打眼工作上，成效显著，深受欢迎，但内燃凿岩机用于坑下作业，还存在着一个废气净化问题需要解决，因此，迄今省内外在这方面多仍处于试验研究探索阶段。几年来，我们曾围绕内燃凿岩机进入坑下作业方面作了一些工作，现介绍如下。
The internal combustion rock drill developed from TK-25 to Dongfanghong-23, and the performance has been greatly improved. The machine in remote mountainous areas, electric power inconvenient open-air areas for drilling operations, with great superiority. Currently in our province has been widely used in open-air drilling work, the effect is significant, very welcome, but the internal combustion rock drill used for pit operations, there is also a need to address the issue of exhaust gas purification, so far in the province and outside in this area are still many In the experimental research stage of exploration. In the past few years, we have done some work on the operation of the internal combustion rock drilling machine into the pit and are described below.