Dynamic sealing device for large-tonnage vacuum consumable electric arc furnace

The utility model relates to the technical field of vacuum equipment, in particular to a dynamic sealing device for a large-tonnage vacuum consumable electric arc furnace. The device comprises a furnace body and an electrode stem, one end of the electrode stem penetrates through the upper end face of the furnace body to be connected with an electrode, a sealing cylinder assembly is arranged on the outer side of the electrode stem, a metal outer cylinder is arranged on the outer side of the upper end of the sealing cylinder assembly, and a connecting plate is connected to the upper portion of the outer side of the metal outer cylinder in a welded mode. The connecting plate is connected with the sealing cylinder assembly through the first split fixing snap ring; a pressing ring is arranged on the outer side of the lower end of the sealing cylinder assembly, the lower end face of the pressing ring is connected with the upper end face of the furnace body, and a second split fixing clamping ring is arranged on the