Argon shielding device for protective casting by long nozzle of ladle

The utility model discloses an argon shielding device for protective casting by a long nozzle of ladle in the field of continuous casting, and aims to solve the problem that at present, a gap exists between a ladle collector nozzle and a long nozzle protection pipe, and after air is sucked, secondary oxidation of molten steel is caused. The device comprises an argon pipe used for blowing argon in the jointed position of the ladle collector nozzle and the long nozzle protection pipe, and the position close to the tail end of the ladle collector nozzle is sleeved with a tapered cap which covers the jointed position of the ladle collector nozzle and the long nozzle protection pipe into the cap. According to the utility model, one relatively closed cavity body is formed in the jointed position of the ladle collector nozzle and the long nozzle protection pipe, an argon ring is formed in the cavity body and isolated from air, when the gap exists between the ladle collector nozzle and the long nozzle protection pipe and performs suction, high-purity argon is sucked in, air is prevented from being sucked to oxidize the molten steel, and the protective casting effect is improved.