为搞好产品更新换代,向矿山用户提供更先进的产品,加速我国的四个现代化建设,天水燎原风动工具厂于1979年9月,已研制出了 YT28型气腿式凿岩机5台,并及时完成了厂内试验室调试和国内同类型产品的对比试验。通过试验证明,5台样机的性能全面达到了设计要求;在同等条件下试验,其凿岩速度比国内同类型产品有较大提高。 In order to improve product replacement, to provide mine users with more advanced products and speed up the four modernizations in China, Tianshui Liaoyuan Pneumatic Tools Factory has developed 5 sets of YT28 air legged rock drill machines in September 1979 Timely completion of the factory test room and the same type of product comparison test. The test proves that the performance of the five prototypes meets the design requirements in all aspects. Under the same conditions, the drilling speed of the five prototypes is greatly increased compared with the same type of products in China.