In the process of continuous casting, the plug brick controls the molten steel flow through the cooperation with the nozzle brick, and the specific implementation method is as follows:

I. Coordination of plug brick and nozzle brick

The plug brick is installed in the plug rod system of tundish, and its head is closely matched with the nozzle brick. In the pouring process, the gap area between the plug brick and the nozzle brick is changed by adjusting the position of the plug brick, so as to adjust the flow of molten steel. This control method is similar to adjusting the switch of the faucet, and the water flow speed is controlled by changing the cross-sectional area of the water flow channel.

II. Adjustment mode

Manual adjustment: the operator manually operates the stopper rod control mechanism to move the stopper brick up and down, changing its relative position with the nozzle brick, thus controlling the molten steel flow.

Automatic adjustment: In modern continuous casting system, an automatic control system is usually equipped to detect the liquid level of molten steel in the crystallizer through sensors, and automatically adjust the position of the plug brick according to the set value to keep the liquid level of molten steel stable.

III. Dynamic adjustment

In the pouring process, with the erosion of molten steel, the plug brick and nozzle brick will be eroded to a certain extent, resulting in an increase in the gap. In order to maintain the stability of molten steel flow, it is necessary to dynamically adjust the position of plug bricks to compensate for the changes caused by erosion.

IV. Argon blowing function

Some plug bricks are designed with argon blowing holes. By blowing argon into the tundish nozzle, the nozzle blockage can be prevented and the fluidity and cleanliness of molten steel can be improved.

Through the above way, the plug brick can effectively control the molten steel flow in the continuous casting process, and ensure the stability of the continuous casting process and the slab quality.