Immersion Nozzle Replacement Guide with Pressing Keyboards

The patent applies preliminary action by positioning the prior-to-use immersion nozzle in advance on the guide rails and pre-aligning it with the in-service nozzle position. The replacement mechanism is prepared beforehand with keyboards positioned to immediately press and guide the new nozzle into place, eliminating the need for manual adjustment during the replacement process and ensuring smooth movement without getting stuck.

The patent applies local quality by designing the upper face of the guide rails with a specific local characteristic - a smooth surface that is distinct from the keyboard surface. This localized smooth area on the guide rail creates a bump-free zone specifically for the prior-to-use nozzle passage, while the keyboards maintain their pressing function on the in-service nozzle. The guide rail's upper face is specifically engineered to be smooth in the region where the replacement nozzle moves, resolving the surface unevenness issue locally without affecting the overall retention mechanism.

The patent applies the intermediary principle by introducing the guide rails as a mediating element between the prior-to-use immersion nozzle and the replacement position. The guide rails provide a controlled, smooth pathway that mediates the movement of the replacement nozzle, ensuring it moves smoothly without getting stuck. This intermediary structure eliminates the harmful effect of surface unevenness while maintaining the quick replacement process, thereby preventing molten metal leakage and ensuring casting continuity.