Patent ID: 6042892
Filing Date: 2000-03-28
Classification: C23C,Y10S

Abstract:
An apparatus for continuously coating zinc on a steel sheet, comprising:a fluidized bed forming chamber for forming a fluidized bed of zinc powders by suspending the zinc powders in a gas;a zinc coating chamber which receives the fluidized bed of zinc powders through a powder inlet tube from said fluidized bed forming chamber, wherein a steel sheet heated by a heating means is passed through the fluidized bed of the zinc powders, and wherein the zinc powders melt-adhere on the steel sheet during a passing of the steel sheet through the fluidized bed of zinc powders;a cyclone for separating the zinc powders from the gas after recovery of the zinc powders from said zinc coating chamber, to discharge the gas, and to return the separated zinc powders to said fluidized bed forming chamber, wherein said cyclone is in connection with both said zinc coating chamber and said fluidized bed forming chamber;a deflector roll for shifting an advancing direction of the steel sheet after its admittance into said zinc coating chamber, wherein said deflector roll is located upstream from said zinc coating chamber;a tension roll for shifting an advancing direction of a zinc coated steel sheet, wherein said tension roll is located downstream from said zinc coating chamber;said zinc coating chamber comprising: said powder inlet tube connected from a side wall of said zinc coating chamber to said fluidized bed forming chamber to inject the fluidized zinc powders into said zinc coating chamber; a gas inlet tube for forming a turbulent flow of the zinc powders and for preventing a leakage of the zinc powders; and a recovering tube for recovering uncoated zinc powders;said gas inlet tube being disposed above said powder inlet tube, and said recovering tube being disposed below said powder inlet tube;said recovering tube being connected between said zinc coating chamber and said cyclone, and a suction pump being connected to said cyclone;a separating plate provided within said zinc coating chamber, for making uncoated zinc powders flow to said recovering tube, and for preventing the zinc powders from flowing to a stabilizing roll; anda stabilizing roll disposed below said separating plate.