Continuous casting tundish device with rotational flow effect and technological method

The invention discloses a continuous casting tundish device with a rotational flow effect and a process method, and belongs to the technical field of metallurgy. The device comprises a special-shaped stopper rod with a flow guide hole, a tundish with a rotational flow cavity, a sliding nozzle and a submerged nozzle with a spiral groove. The flow guide holes are uniformly distributed in the bottom of the special-shaped stopper rod base; the central axes of the special-shaped stopper rod, the rotational flow cavity and the submersed nozzle coincide. The method comprises the steps that a sliding nozzle is in a closed state, molten steel is injected into a tundish, the opening size of the sliding nozzle is adjusted after the liquid level is stable, the molten steel is injected into a crystallizer from the tundish, and after the liquid level is stabilized again, a special-shaped stopper descends to make contact with the bottom face of an inner cavity of the tundish; after the molten steel enters the rotational flo