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YZ—90型外回转(即独立回转)重型导轨式凿岩机是在批林整风和批林批孔运动推动下,遵照伟大领袖毛主席“自力更生”、“奋发图强”的教导,我院与南京战斗机械厂、河北铜矿、滇中铜矿组成的有工人、技术人员和领导干部参加的“三结合”试制小组,经过近三年的反复试验和改进,试制成功我国自行设计、制造的第一台中深孔外回转凿岩机。它通过在江苏冶山铁矿、河北铜矿、大庙铁矿等地进行的“每台穿孔万米”的工业试验,证明机器性能良好,深受矿山欢迎。一机部于1974年8月在南京召开了鉴定会,同意该机定型,由南京战斗机械厂尽快投入小批量生产。现将该凿岩机作一简单介绍。
YZ-90 type of outer rotary (ie, independent rotary) heavy rail driller is guided by Chairman Mao’s “Self-reliance” and “Striving for Success” driven by the “ Plant, Hebei Copper Mine, Yunnan Copper mine composed of workers, technicians and leading cadres to participate in the ”triple combination“ trial group, after nearly three years of trial and improvement, the successful trial of China’s own design and manufacture of the first Taiwan Deep hole outside the rotary rock drill. It passed the industrial test of ”per meter of perforation per meter" carried out in Jiangsu Ye Shan Iron Mine, Hebei Copper Mine and Dawu Iron Mine to prove the good performance of the machine and was welcomed by the mine. A machine department held an appraisal meeting in Nanjing in August 1974, agreeing that the machine was finalized and put into small-batch production as soon as possible by Nanjing Fighting Machinery Factory. The rock drill now make a brief introduction.