Ladle flow control device for preventing molten steel from being solidified

Abstract

The invention discloses a steel ladle flow control device for preventing molten steel from solidifying, which comprises an upper nozzle fixed at the bottom of a steel ladle and a lower nozzle fixed on a lower sliding plate, and the upper surface of the lower sliding plate is connected to the bottom surface of the upper nozzle in a sliding manner, so that the lower nozzle can transversely move to be butted and communicated with the upper nozzle or be closed in a staggered manner with the upper nozzle. A pouring hole of the upper nozzle is in a horn shape with a large upper opening and a small lower opening, and the slope angle of the pouring hole is 50-80 degrees; the upper nozzle and the lower sliding plate are of hollow structures, heat insulation cavities are formed in the upper nozzle and the lower sliding plate, and the minimum thickness of the heat insulation cavities is not smaller than 20 mm. Molten steel enters the horn-opening-shaped steel ladle upper nozzle, the molten steel in the nozzle can be kept in a liquid state under the heat preservation effect of the upper nozzle and a heat insulation layer of the lower sliding plate and the supplement effect of heat of the high-temperature molten steel on the upper portion of the upper nozzle, and the problem that the molten steel is solidified to block the steel ladle nozzle, and finally the molten steel cannot be automatically cast is solved. And the problems of secondary pollution and the like caused by the use of the fire-resistant stuffing sand are avoided.

Description

technical field [0001] The invention relates to the field of steelmaking equipment, in particular to a ladle flow control device for preventing molten steel from solidifying. Background technique [0002] At present, in the metallurgical industry, sliding mechanisms are generally used to control the flow rate and switch of molten steel from ladle to tundish. The sliding mechanism changes the relative position of the upper and lower pouring holes through the sliding of the lower plate to realize the adjustment of the molten steel flow rate and switch. In order to improve the automatic casting rate of the continuous casting ladle (referred to as the self-opening rate), the ladle needs to be filled with refractory refractory drainage sand into the ladle upper nozzle before filling the molten steel. The drainage sand is located in the upper nozzle of the ladle between the lower plate of the ladle and the molten steel. After filling the molten steel into the ladle, when the drai...

AI Technical Summary

Problems solved by technology

However, in the published literature, the research focus of domestic and foreign scholars is still based on the automatic pouring process of drainage sand, and seldom carry out related research work without drainage sand.

However, refractory drainage sand is a foreign inclusion compared to molten steel. Once it enters molten steel, it will pollute molten steel and become the main source of impurities in continuous casting slabs, which will eventually affect the quality of steel products.

[0004] After the drainage sand is drained, how to prevent it from entering the molten steel and preventing it from contaminating the molten steel, there is currently no better solution other than using a manual sand tray to trap the drainage sand

Although this method can prevent the drainage sand from entering the tundish and contaminating the molten steel, it is difficult to judge and control when the drainage sand is finished and whether the molten steel flows into the long nozzle.

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