In the paper, the fit tolerance and chamfer structure for quick-change coupler of oxygen lance as well as flexible connection mode between coupler and nozzle of medium are analyzed in detail. The fit dimension, chamfer length, surface roughness of fitting surface and type of connection of compensator are improved based on the analysis results combining with actual situations on site. On the premise of not affecting original using functions of oxygen lance, the rapid replacement for oxygen lance of 240 t converter is realized so that the duration of replacing oxygen lance is shortened, labor intensity of workers is reduced and safety of operating personnel is ensured.

oxygen lance of converter  /  fit tolerance  /  rapid replacement