JPH04327361A - Vessel for incorporating molten metal - Google Patents

Abstract

PURPOSE:To reduce the intrusion of molten metal into a gas blowing part after completing bubbling by arranging a means for preventing the staying gas in a gas passing tube from discharge, in the passing tube from gas supplying source to the gas blowing part even in the case of releating the connection. CONSTITUTION:The gas is blown into the molten metal from a porous plug 3 in a ladle 1 through a piping 4. At the time of completing the gas blowing, at first, after closing a first cock 8, a second cock 8 is closed, and after preventing back flow of the staying gas with a non-return valve 10, a first elbow 5 is taken off to stop gas supply into the piping 4 from a gas supplying source. The invasion of molten metal into the gas blowing part after completing the bubbling, can be reduced and melt-cleaning quantity with oxygen gas can do a little, and service life of the gas blowing nozzle can be extended.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a container for storing molten metal, such as a ladle, having a conduit for conveying gas to a nozzle for discharging stirring gas into molten metal.

0002

[Prior Art] Conventionally, piping for conveying gas to such a nozzle has been carried out along the outer surface of a ladle through a pipe that introduces gas from a gas supply source and leads it to a gas blowing nozzle attached to the bottom of the container. The gas injection nozzle attached to the bottom of the ladle is connected to the gas introduction pipe of the porous plug of the tuyere to form a gas passage pipe. and a gas supply source to blow gas into the molten metal. When transferring the ladle or stopping gas introduction during casting, the elbow of the gas pipe is removed to disconnect the gas supply source and stop the gas introduction.

At this time, since the connection part of the gas pipe is open, no pressure head is applied to the nozzle, and the molten metal (metal) enters the pores of the gas blowing nozzle, solidifies and blows the nozzle. This will block the stomata.

[0004] For this reason, each time after finishing casting, it is necessary to melt and clean the intruded metal by combustion heating using oxygen spray to melt and remove the intruding metal.

[0005] When this metal is dissolved and removed, the nozzle base is also damaged, which shortens the life of the gas injection nozzle.

[0006]

[Problems to be Solved by the Invention] The problem to be solved by the present invention is to effectively prevent metal from entering the gas blowing section during non-operation when gas is not blowing in a molten metal container having such a gas blowing nozzle. The goal is to find the means to do so.

[0007]

[Means for Solving the Problems] The present invention provides a connection between the gas supply source and the passage pipe, which extends from the connection part with the gas supply source located on the outer surface of the molten metal storage container to the gas blowing part. The present invention is characterized in that a means is provided to prevent the gas stagnant in the gas pipe from being released even when the gas pipe is opened.

As this gas release prevention means, a check valve or a cock can be used, and either a gas pipe provided from the outside of the container under the bottom surface or a gas introduction pipe of a gas blowing nozzle connected thereto. It can also be provided at locations such as

[0009]

[Operation] After bubbling of molten metal by gas blowing,
Even if the connection between the gas supply source and the ladle piping is removed by closing the check valve or cock, the gas remaining in the piping will remain at the head pressure against the gas injection part, and this Prevents residual gas from entering the molten metal in the container into the gas outlet.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example in which the present invention is applied to a ladle.

In the figure, reference numeral 1 indicates a ladle having a lining 2 and a gas-blown porous plug 3 attached to the bottom thereof. On the outer periphery of the ladle 1, a pipe 4 for supplying gas from a gas supply source (not shown) to the porous plug 3 descends along the outside of the ladle 1, and further extends as a flexible pipe along the bottom surface of the porous plug. It is provided up to 3. A first elbow 5 for connecting to a gas supply source is attached to the starting point of this piping 4, and a second elbow 5 for connecting to a gas introduction pipe 6 provided at the base of the porous plug 3 is attached to the end point. Elbow 7 is attached. Further, 8 indicates a first cock attached to the first elbow, 9 indicates a second cock attached to the second elbow 7, which corresponds to the connection part with the gas blowing porous plug 3, and furthermore, a second cock is attached to the container. A check valve 10 is provided on the outer vertical pipe.

In the ladle having such a piping structure, the first elbow 5 is connected to a pipe leading to a gas supply source (not shown) to introduce gas, and the gas is blown into the molten metal from the porous plug 3. To finish blowing gas, first close the first cock 8, then close the second cock 9, prevent the backflow of the accumulated gas with the check valve 10, and then remove the first elbow 5. , shut off the gas supply to the piping from the gas supply source.

[0013] In this way, even if the ladle is moved with the gas supply source and the ladle piping disconnected, the porous plug 3 can maintain the head pressure when gas is blown into the ladle. Intrusion of the stored molten metal into the porous plug 3 can be clearly reduced. Therefore, the dissolution and cleaning with oxygen gas at the end of the work can be lightened, and the amount of erosion of the porous plug 3 can be reduced accordingly.

[0014]

[Effects of the Invention] The present invention provides the following effects.

(1) The intrusion of molten metal into the gas injection section after bubbling is effectively reduced.

(2) Due to this reduction, the amount of dissolution and cleaning with oxygen gas is reduced, and the amount of gas blowing nozzle erosion is also reduced, resulting in a longer life.

[Brief explanation of the drawing]

FIG. 1 shows an example in which the present invention is applied to a ladle.

[Explanation of symbols]

1 Ladle 2 Lining 3 Porous plug 4 Piping 5 First elbow 6 Gas introduction pipe to the porous plug 7 Second elbow 8, 9 Cock 10 Check valve

Claims (2)

[Claims] Claim 1: A gas passage pipe that extends from a connection part with a gas supply source located on the outer surface of a molten metal storage container to a gas blowing part, even if the connection between the gas supply source and the passage pipe is opened, A molten metal storage container equipped with a means to prevent the gas stagnant inside from being released. 2. In claim 1, the means for preventing the gas stagnant in the gas pipe from being released even if the connection between the gas supply source and the pipe is opened is a check valve or a cock. A molten metal storage container.