Quenching furnace is widely welcomed by customers for its advantages of fast heating speed, high production efficiency, less oxidation and decarbonization, fast melting speed, self stirring function, uniform melting temperature and metal composition, and good electric heating working environment. At present, there are three kinds of well type carburizing and quenching furnace (well type furnace), sealed box type multi-purpose carburizing and quenching furnace (box type furnace) and push rod type continuous carburizing and quenching furnace (continuous furnace).