The blast ring and charging hopper of a cupola was modified.As a result, the break down rate and maintenance cost was obviously decreased, and the melting process became more smooth.

• 对冲天炉风圈、加料漏斗的技术改进,使冲天炉的故障率明显降低,维修费也大大下降,很好地保证了熔炼工序的顺利进行。