According to the Urgent requirement of smelter production, the USG2model 50t cleaning machine for converter outlet,which is the first one in China,was de- veloped. Along with the application of this machine, the mechanization of the converter outlet cleaning has been realized,the hard work which the cleaning was done by men in the past has been eliminated,the cleaning time has been shortened and the safe production has been ensured. This machine is novel in design,good in performance and reliable in working. Besides the converter outlet cleaning,it can be used to break the slags, material blocks and concrete road surface,and dismantle the furnace lining,The economical and social benefits are very considerable.