The sizing quick-change water inlet is one of the key components of the continuous casting tundish.
The sizing quick-change water inlet cooperates with the water inlet to control the flow of molten steel during the continuous casting process, so that the molten steel flows into the crystallizer evenly and stably, ensuring the normal continuous casting. Through the quick-change mechanism, multiple water inlets can be replaced in one pouring of the tundish to cooperate with the long-life tundish lining, improve the operation rate of the continuous casting machine, the yield of the casting billet, and achieve efficient continuous casting.
Structure: It usually consists of a sizing water inlet, a quick-change water inlet and a quick-change mechanism. The quick-change water inlet generally has a tubular water inlet zirconium core, and its molten steel inlet is a trumpet-shaped structure with a large top and a small bottom. From the trumpet-shaped structure to the molten steel outflow end, the molten steel flow channel is a cylindrical structure. In order to facilitate replacement and reuse, there is also a water inlet circulation jacket, which is mostly made of heat-resistant alloy steel. The water inlet zirconium core is set in its axial through hole, and the two are sealed and connected by a fire mud layer.
Working principle: The sizing nozzle quick replacement device has a nozzle moving slideway, and the nozzle and spare nozzle in the working state are both positioned in the slideway. When the nozzle needs to be replaced, the spare nozzle is pushed from the spare position to the working position through a hydraulic drive device, a lever principle or manpower, etc., to replace the eroded old nozzle, so that the new nozzle is connected to the upper nozzle in the seat brick, and the molten steel flows into the casting mold through the new nozzle, thereby realizing the rapid replacement of the sizing nozzle during the continuous casting process.
The nozzle can be quickly replaced without interrupting the pouring of molten steel, reducing the number of tundish replacements and downtime, and improving the operating rate and production efficiency of the continuous casting machine. For example, after a steel plant adopted the sizing quick-change nozzle technology, the average number of single-package continuous casting furnaces increased significantly, and the continuous casting time was also significantly extended.
It can stabilize the casting speed within the required range, avoid the adverse effects of excessive casting speed on the quality of continuous casting billets due to nozzle erosion and expansion, such as surface cracks, internal segregation, etc., and ensure the quality of casting billets and stable operation.
Reduce the amount of waste steel in the tundish, the amount of head and tail cuts of continuous casting billets, and the consumption of refractory materials, thereby reducing production costs. At the same time, some recyclable nozzle jackets further reduce costs.
It is mainly used in the continuous casting production process of steel enterprises, and is suitable for continuous casting machines of various square billets and rectangular billets. Whether it is a large steel joint venture or a small special steel production plant, as long as it involves continuous casting process, the sizing quick-change nozzle can play an important role, helping to improve production efficiency and product quality and reduce production costs.
