The upper precision machine (EW - RF200 backflow already import lead-free craft) is our development for a small patch production, electronic products, convenient maintenance technology of SMT soldering equipment. The products according to the current demand for the development of electronic devices, using the hot air heating mode, has circumfluence, maintenance, thermal curing processing function, can satisfy different material parameters of solder paste, make all the elements in the reflow soldering heated evenly, to achieve the best effect, especially suitable for the development of large and medium-sized institutions, every electron electronic company development department, small batch many varieties of small and medium-sized enterprises, the production requirement.