The utility model discloses an LF furnace
steelmaking closed-loop arc sealing device which comprises an LF furnace structure, a port support is arranged at the lower port of an air blowing
brick opening in the LF furnace structure and connected with a pull rod, the pull rod is inserted into a spring
pipe provided with an air pressure spring in a sliding mode, the spring
pipe is fixed to the top corner position of the upper portion inside a bamboo-hat-shaped shade, and an inclined blowing hole is formed in the lower frame of the side face of the shade. Initially, the shade is hermetically inserted into a blowing hole slot of the furnace body, and the surface of the shade is also annularly provided with spacing-adjustable constraint claws along the axis; in the
steelmaking process,
argon is blown out from the blowing
brick opening, the shade is pushed to move upwards, the inclined blowing hole moves out of the blowing hole inserting groove, communication between the furnace body and the interior of the shade is achieved,
argon is rotationally blown into the furnace body,
molten steel is driven to be stirred, the purity of the
molten steel is improved, meanwhile, the blowing
brick opening is prevented from being corroded and blocked by the
molten steel and furnace
slag, the equipment maintenance cost is reduced, and the
downtime is shortened. The shade moves upwards to push the restraining claw to position and restrain the lower end of the
electrode, and the influence of molten steel flow on the
electrode is reduced.