一九五八年以前,我厂采用仿苏式三排风口冲天炉。一九五八年至一九六四年间曾对这种冲天炉的风口结构进行过多次改革,先后采用过三排、四排、五排、七排、九排风口等进行试验和生产,但是始终感到铁水温度和质量不够理想。因为我厂主要生产齿轮加工机床,铸件具有厚大导轨,要求耐磨性高,需要硬度配对的零件较多,大部分齿轮、蜗轮及工作台 Before 1958, I plant imitation Soviet-style three-row outlet cupola. Between 1958 and 1964, the structure of the tuyere of this cupola had been reformed several times. It had been tested and produced in three rows, four rows, five rows, seven rows and nine vents , But always feel the temperature and quality of hot metal is not ideal. Because I plant mainly produces gear processing machine tools, castings with thick rails, requiring high wear resistance, the need to match the hardness of more parts, most of the gear, worm gear and table