Discharging port sliding control device for production of refining agent in open-hearth furnace

The invention discloses a discharging port sliding control device for production of a refining agent in an open-hearth furnace. The sliding control device comprises an upper nozzle, an upper sliding plate, a lower sliding plate and a lower nozzle, wherein the upper nozzle and the upper sliding plate are fixed together, the lower nozzle and the lower sliding plate are fixed together, and the upper sliding plate and the lower sliding plate achieve communication or disconnection of the upper nozzle and the lower nozzle in a relative sliding mode. Under the condition that the upper nozzle and the lower nozzle are completely communicated, the diameters of through holes of the upper nozzle, the upper sliding plate, the lower sliding plate and the lower nozzle are the same, the through holes are completely centered, and the center lines are kept on the same straight line. According to the sliding control device, the labor intensity of workers can be relieved, the working environment can be improved, meanwhile, the d