Analysis of the causes of the fracture of the ladle nozzle

The ladle nozzle is broken, and the specific reasons may have the following problems:

1. Reasons for sliding nozzle mechanism

1) The sliding mechanism is used for a long time at high temperature, or accidentally collided during operation, etc., which causes a large amount of deformation of the sliding gate mechanism, resulting in uneven force on the interface of the skateboard, and a small gap will be formed in the part with a small force surface, which may cause the skateboard. Infiltration steel.

2) The sliding trolley with the lower slide plate will slowly produce errors between the upper slide plate mechanism and the upper slide plate due to the long time loading and unloading of the slide plate, resulting in a small gap between the upper and lower slide plates.

3) Because the springs used in the mechanism have been used in high temperature environments for a long time, sometimes even though they are not in service, they may deform and fail. Under the static pressure of molten steel, there will be gaps between the skateboards, which may lead to steel seepage between the skateboards. It may be possible to wear steel into the entire body.

4) The deformation of the drain top sleeve makes the drain installation incorrect, or the pin buckle of the drain top sleeve sliding trolley is worn for a long time, so that the drain and the lower sliding plate cannot be tightly tightened. Steel infiltration.

2. Reasons for Skateboarding

1) The flatness of the skateboard surface does not meet the requirements, the flatness is low, and a microwave gap is formed between the skateboards.

2) There is a problem with the quality of the skateboard. When pouring, especially on the continuous sliding secondary skateboard, the surface scratches are serious, or a horseshoe-shaped melting loss is formed at the mouth of the skateboard. The molten steel will penetrate into the deeper scratches, where the temperature is relatively relative. If it is lower, the molten steel will condense to form steel clamping. If you continue to operate the slide plate, especially in continuous casting with large strokes, the gap between the slide plates may increase due to the steel clamping, which may cause a leakage accident.

3. Reasons for on-site operation

1) The refractory mortar is not working well, and the thickness is inappropriate. If the fire mortar in the installation nozzle is too thin, it will be squeezed out, and it will not provide good support. If it is too thick, it will not spread well. Moreover, when the residual mud in the nozzle eye is blown with high-pressure compressed air, the too thin refractory mud will be blown out of the gap, which lays a hidden danger for the sewer seepage.

2) The dry refractory mud in the upper nozzle mechanism is not cleaned up, or there is steel slag, there is a little refractory mud on the surface of the skateboard, and it is not cleaned up due to negligence during use. When the fire mud is applied to the drain, the fire mud is mixed with particles The dry refractory sludge of the steel, which brings many hidden dangers to the production.

3) Problems in the operation of the continuous casting machine. When the ladle is opened for pouring, a large ladle nozzle is hung on the nozzle for protective pouring. At this time, you should try to avoid pulling the slide plate with the ladle nozzle with a large stroke. This may cause the nozzle to become loose due to improper operation. It may cause steel seepage in the drain. The flow rate can be adjusted by inching mode instead.

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