Molten steel tank sliding nozzle opening and closing device

The utility model relates to a molten steel tank sliding nozzle opening and closing device which comprises an upper nozzle, a ladle datum plate, a supporting plate, a bracket, an upper sliding plate, a lower sliding plate, a sliding sleeve, a lower nozzle, a nozzle sleeve, a locking sleeve device, a guide device and a hydraulic cylinder. The lower sliding plate is arranged in the sliding sleeve, the lower nozzle is arranged in the nozzle sleeve connected with the sliding sleeve, the sliding sleeve and the nozzle sleeve are fixed to the bracket through the locking sleeve device and connected with the hydraulic cylinder through the guide device, the sliding sleeve is driven by the hydraulic cylinder to move back and forth, and therefore a molten steel tank sliding nozzle is opened and closed. The molten steel tank sliding nozzle opening and closing device has the advantages that reliable sealing pressure is generated between the upper sliding plate and the lower sliding plate so that molten steel can not leak; the upper nozzle is located accurately and bounces are avoided; the lower nozzle is internally arranged, so that molten steel leakage caused by looseness is avoided; operation is simple and convenient in a hydraulic mode, the locking control accuracy is high by the use of the locking sleeve device, and operation is safe and reliable.