一、概述 蒸汽机车牵引在我国铁路运输中,仍然占有重要的地位,因此,充分发挥和提高蒸汽机车的牵引力仍然是机务部门的一项重要工作。蒸汽机车过热装置是机车锅炉的重要部件之一,其质量好坏直接影响锅炉热效率的发挥,从而与机车能否达到多拉快跑的要求相关联。由于过热箱与过热管口组装时配合不密接,在机车运行中,局部接口漏泄严 I. Overview Steam locomotive traction still occupies an important position in the railway transport in our country. Therefore, it is still an important task of the maintenance department to give full play to and enhance the traction of steam locomotives. Steam locomotive overheating device is one of the important parts of locomotive boilers, the quality of its direct impact on boiler thermal efficiency play, and thus whether the locomotive can achieve Dora run requirements. Due to the overheating box and overheating nozzle assembly is not close with the assembly, locomotive running, the local interface leak tight