我矿在平巷掘进中,主要采用YT-25型气腿式凿岩机和22毫米六角钎杆。过去,钎杆是由钢厂供应中空钢材,我班加工制成成品供应井下使用。一九七五年贵阳钢铁厂研制并批量生产这种钎杆,从此我矿所用钎杆全部由贵钢生产的成品钎供应,我班的任务主要成为返修失效了的成品钎。在返修成品钎的过程中,贵阳钢铁厂大力帮助我们改进了工艺和设备,使钎杆质量稳 Our mine mainly uses YT-25 air leg rock drills and 22 mm hex drills in roadway excavation. In the past, drill rods were supplied by steel mills with hollow steel, which was processed into finished products and supplied underground. In 1975, the Guiyang Iron and Steel Plant developed and mass-produced this kind of drill rod. Since then, all the drill rods used in our mine have been supplied by the finished product brazed by Guisteel. The task of our class has mainly been to rework repaired finished brazing products. In the process of repairing the finished brazing, Guiyang Iron & Steel Co., Ltd. helped us to improve the process and equipment, and made the quality of the brazing rod stable.