Process technology introduction of tundish sizing nozzle quick replacement system

At present, the representative quick-change systems at home and abroad are:

(1) Comcast nozzle adjustment system (CNM);

(2) Danieli flying nozzle replacement system (FNC);

(3) Interstroke sizing nozzle replacement system (MNC);

(4) Kurosaki Harima Co., Ltd. Tundish Nozzle Online Replacement System (OTNC);

(5) Vesuvius calibrated nozzle replacement system (CNC).

Although there are many quick-change systems, there are two main ways to sum up from the replacement method:

The quick replacement methods are:

1.Hydraulic quick change method:

The in-use nozzle and the spare nozzle are placed on the same plane back and forth, supported by a high-temperature spring, and replaced with a hydraulic ejector method;

The quick replacement of the sizing nozzle adopts a specific mechanical device. There is a running slideway with an accurate size in the device, and the sizing nozzle and the spare sizing nozzle in the working state are positioned in the slideway.

When the sizing nozzle needs to be replaced, press the start button, and the hydraulic drive device pushes the standby nozzle to slide from the standby position to the working position within 0.1s, and the original working nozzle is pushed out to the collection position;

The molten steel is injected into the mold through the new nozzle, so that the sizing nozzle can be quickly replaced during the continuous casting process. After replacement, the deviation of the center line of the upper and lower nozzles is less than 0.1mm.

2. Manual quick change method:

The in-use nozzle and the spare nozzle are placed in a fan shape on the same plane, mechanically fixed, and replaced manually. The manual replacement mechanism is simple, divided into four parts: the base, the fixed plate, the sector plate, and the spring pressure regulator.

There are two sizing nozzles in the fan-shaped skateboard frame. Moving the handle of the fan-shaped frame can make the casting hole of one of the nozzles on the fan-shaped skateboard frame work, and the other nozzle has been moved to the other side of the device. Replace the removed nozzle brick.

The characteristics of the device are:

(1) The device has reasonable structure, simple structure, convenient maintenance and low labor intensity.

(2) Using a unique spring pressure regulator, there is a certain pre-pressure on the nozzle, which can quickly replace the new nozzle brick under the condition of continuous flow.

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