Circle circle plasma surfacing antifriction plate preheat with heat preservation device

The utility model relates to a steel sheet surface overlaying field, concretely relates to circle circle plasma surfacing antifriction plate preheat with heat preservation device, including fuel gas preheating nozzle, heating resistor silk, outer insulation material, steel sheet temperature measuring device and temperature control system. Preheating before the steel sheet build -up welding is accomplished by the fuel gas preheating nozzle, it is located the build -up welding drum to preheat the nozzle, follow drum axial arrangement in a plane, the heat preservation process of build -up welding drum is realized by the insulation material of embedded heating resistor silk, the heat preservation device is in the drum outside, temperature measuring device detects build -up welding steel sheet temperature and conveys to temperature control system, the switching time of temperature control system controlling resistance silk guarantees with the switch time and amount who preheats the nozzle that the build -up welding steel sheet is in preheating and holding temperature of requiring.