DOOR APPARATUS OF HEATING FURNACE

摘要

The present invention relates to a door device of a heating furnace including a door opening/closing an open portion of the heating furnace, a pressure chamber formed on the outside of the open portion to communicate with the interior of the heating furnace, an air supply device supplying air to the interior of the pressure chamber to allow the air in the pressure chamber to be formed equal to the internal pressure of the heating furnace, and a pressure control device comparing the internal pressures of the heating furnace and the pressure chamber and activating the air supply device if the internal pressure of the pressure chamber is lower than that of the heating furnace.