The sliding nozzle is a control device for molten steel in the casting process of the continuous casting machine. It can accurately adjust the water flow from the ladle to the continuous casting tundish to balance the inflow and outflow of molten steel, thereby making the continuous casting operation easier to control , An essential part of smelting.
The sliding nozzle is usually composed of a driving device, a mechanical part and a refractory material part, that is, an upper and lower slide plate and a nozzle. The working principle of the sliding nozzle is to slide the upper and lower sliding bricks through the sliding mechanism, thereby driving the opening and closing of the steel hole to adjust the flow of molten steel.
In order to obtain a long service life and stable working conditions, the sliding plate, which is the refractory material and mechanical component of the sliding nozzle system, requires excellent performance.
At present, in order to make the performance of the sliding nozzle system more stable and reliable, many improvements and researches have been made on the shape and fixing method of the sliding plate. The main purpose is to suppress the generation and propagation of cracks on the working surface when using the sliding plate.
The sliding plate is one of its main components. It can be divided into two layers and three layers according to the number of sliding blocks constituting the sliding nozzle system. Ladle slides are usually two-story, the upper slide is fixed during operation, and the lower slide is used for interception and throttling. The skateboard of the tundish is usually three-layered. During operation, the upper slide is fixed on the upper nozzle, the lower slide is fixed on the lower nozzle, and the middle slide is used for interception and throttling.
