AN APPARATUS FOR OPENING AND CLOSING A GAS DUCT OF A ANNEALING FURNACE

摘要

PURPOSE: A device for opening and closing gas injection pipe of annealing furnace is provided to improve annealing quality of workpiece by effectively preventing external leakage of atmospheric gas in the annealing furnace and reducing temperature deviation between atmospheric gas newly injected and atmospheric gas in the annealing furnace. CONSTITUTION: In a device(1) for opening and closing a gas injection pipe(12) of annealing furnace(10) in which the device is installed in the gas injection pipe connected to the annealing furnace to inject atmospheric gas into the annealing furnace, the device comprises a device housing(20) comprising an inlet(30) to which the gas injection pipe is connected, and a plural gas outlets(40) integrated with the inlet and arranged with being made its way into the annealing furnace; a plural gas heating means(50) installed inside the device housing; an opening and closing member(60) installed in the gas outlet of the device housing to open and close the outlet according to gas pressure; and a gate means(70) connected between the inlet and the gas injection pipe to seal the inlet according to gas pressure.