The invention discloses an explosion-proof device on a
smelting furnace. The explosion-proof device comprises a furnace body of the
smelting furnace. A pressure relief hole is formed in the furnace body. An explosion-proof
pipe communicated with the pressure relief hole is formed on the outer wall of the furnace body. A
retaining ring is fixedly inserted into the lower end of the explosion-proof
pipe. An explosion-proof cover is inserted in the explosion-proof
pipe. The lower end surface of the explosion-proof cover is pressed against the
retaining ring. The outer wall of the explosion-proof cover is pressed against the inner wall of the explosion-proof pipe. A guide column is formed in the center of the upper end surface of the explosion-proof cover. A positioning disc is fixedly insertedinto the portion, on the upper side of the guide column, in the explosion-proof pipe. A guide hole is formed in the center of the positioning disc. The guide column of the explosion-proof cover is inserted into the guide hole of the positioning disc. A
magnet ring is fixed on the portion, around the guide column, of the upper end face of the explosion-proof cover, electromagnets opposite to the
magnet ring are fixed on the upper end face of the positioning disc, and the electromagnets and the
magnet ring repel each other. A proximity switch sensor opposite to the guide column is fixedly inserted into the portion, at the upper side of the positioning disc, of the explosion-proof pipe. By the adoption of the explosion-proof device on the
smelting furnace, the explosion-proof cover can be automatically closed after explosion-proof pressure relief.