Change method of externally-installed and bottom-blown air brick of steel ladle

Abstract

The invention relates to a change method of an externally-installed and bottom-blown air brick of a steel ladle. The method mainly comprises the steps of (1) installing a brick cup by a centering positioning mould, namely positioning a brick cup installing position by the centering positioning mould to guarantee the coaxiality between the brick cup and a hold-down mechanism, so that the coaxiality between the air brick and a base plate of the hold-down mechanism can be guaranteed; (2) installing the air brick, namely smearing fire clay onto the air brick, inserting an installing tool into an air inlet steel pipe of the air brick, and horizontally inserting into holes of the brick cup, so that the coaxiality between the brick cup and the air brick can be guaranteed; and (3) withdrawing the air brick, namely charging low-temperature compressed air, and withdrawing the air brick by a hollow piston hydraulic oil cylinder. After the method is used, the air brick can be exactly positioned and installed by a special tool, the air brick can be exactly aligned, and the air brick can be quickly withdrawn from the outer side of the steel ladle, so that the long-term hard work of workers under high-temperature environment can be avoided, the work safety factor can be improved, and the work efficiency can be improved.

Description

technical field [0001] The invention relates to a method for replacing a bottom-blown ventilation brick on the outside of a ladle. Background technique [0002] The ladle used to store molten steel in the steelmaking process is increasingly used as a container for refining molten steel, such as in vacuum argon blowing furnace (VD), vacuum argon oxygen furnace (VOD), vacuum refining (RH), ladle In the refining process such as furnace (LF), it is necessary to blow inert gas argon from the bottom of the ladle. Argon gas is generally blown into the molten steel through the breathable brick installed at the bottom of the ladle. The function of the bottom thread is to connect the external blown gas pipeline. The stainless steel plate on the surface is to ensure the accuracy of the shape and size of the breathable brick, so that the breathable brick and the seat brick hole of the positioning breathable brick are closely matched, and the contact surface between the breathable brick...

AI Technical Summary

Problems solved by technology

[0004] There is also a problem with the installation method of the external bottom blowing air brick. The main reason is that it is difficult to take out the air brick. Generally, the steel ladle is placed flat on the ground. Using its frustum-shaped shape, a long rod is used to center it from the inside of the steel ladle and then hit the air. Brick, so that the adhesive mortar between the air brick and the seat brick is broken and separated from the seat brick, and falls on the outside of the ladle

Because the ladle is deep and the temperature of the ladle is high, the rod must have high temperature-resistant strength and rigidity, and it is heavy and requires multiple people to operate; at the same time, it is difficult to center, and it takes a long time to try and impact the center, which often occurs Damage to the seat brick or other refractory lining around the air brick

There is also a method of using a hydraulic impact device to strike and remove the central air brick. Due to the limitation of the length of the impact rod, the hydraulic equipment enters the high-temperature ladle, which is very easy to burn out the seals of the pipe fittings and damage the equipment. It is difficult to remove the air brick, which restricts the external bottom blow The bottleneck of the development of breathable bricks

At the same time, because it is difficult to accurately align the seat brick and the breathable brick, there is uneven application of fire mud, and the hidden danger of the breathable brick falling off under the impact of molten steel is increased.

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