Furnace cover device of semi-closed ore heat furnace

The utility model discloses a furnace cover device of a semi-closed ore heat furnace, which comprises a furnace cover, a large-scale water-cooling ring beam, a furnace cover feed opening, three electrode core circle diameter adjustable mechanisms, an electrode water-cooling sealing device, a furnace cover water-cooling door, a furnace cover material pushing door, furnace cover hanging devices and a furnace cover smoke colleting port. The furnace cover is composed of eighth water-cooling furnace cover petals, and the whole furnace cover is fixed on ten furnace cover hanging devices through flanges and bolts. The three electrode core circle diameter adjustable mechanisms are respectively installed on three water-cooling furnace cover petals right facing an electrode. The furnace cover device adopts the large-scale water-cooling ring beam structure, the whole furnace cover is reasonably separated according to different functional portions, a design mode that ten hanging devices are evenly arranged according to s