JPS6145149Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention is an upper nozzle equipped with a gas blowing structure for molten metal refining of a so-called sliding nozzle device (hereinafter referred to as SN device) that controls outflow, stoppage, and adjustment of molten metal. It concerns bricks.

Prior Art Conventionally, an SN device has been used to drain molten metal from a molten metal container such as a ladle or tundish, and it is also known to perform gas bubbling within the container for refining the molten metal.

However, the SN device and gas bubbling device were installed at different locations at the bottom of the container.
A typical embodiment thereof is shown in FIG. 1, where A is a gas bubbling device and B is an SN device.

Problems that the invention aims to solve As a result, if the work of both sides overlapped, each worker had to be assigned to replace bricks, etc., which required a large number of workers.

An even bigger problem was the leakage of molten metal from gas bubbling equipment. In other words, in order to prevent this leakage accident, the work involved accurately assembling gas bubbling plug bricks (hereinafter referred to as plug bricks) and tuyere bricks, applying mortar, etc. is extremely complicated, and it takes 30 to 40 minutes to replace the bricks. It took a long time. Furthermore, since the mortar was applied to the entire length of the plug, it was very difficult to pull it out after use. Even with the careful work described above, leakage accidents still occur from time to time.

This invention completely prevents the above leakage accident and allows easy replacement of plug bricks.
The purpose is to provide nozzle bricks for SN equipment.

Means for Solving the Problems Hereinafter, means for solving the above problems will be specifically explained based on an embodiment shown in the attached drawings.

FIG. 2 is a sectional view of a main part of an SN device equipped with a nozzle for an SN device according to the present invention, in which a gas bubbling plug receiving hole 21 is provided in the upper nozzle brick 1 in parallel with the molten metal outflow hole 2, A molten metal outflow hole 5 and a gas bubbling plug receiving hole 61 are provided in the fixed plate brick 4 so as to be connected to the holes 2 and 21, and a plug receiving brick 6 is buried in the receiving hole 6-1. A slidable sliding plate brick 7 is placed under the fixed plate brick 4 together with the fixed plate brick 4 under surface pressure.

The bubbling plug receiving holes 21 and 6-1 are in communication with each other, and a plug brick 3 is fitted into the bubbling plug receiving hole 21 in the upper nozzle 1 with mortar 9. Note that 20 is an iron plate that surrounds the plug brick 3 and the receiving brick 6.

The lower gas blowing pipe 8 of the plug brick 3 and the plug receiving brick 6 has a gas distribution pipe (not shown) whose lower connecting pipe 10 is fixedly arranged on the outer surface of the steel shell of the molten metal container from the outside through the fixed plate brick 4. It is communicated with. Note that the above gas includes not only an inert gas such as argon but also oxygen.

FIG. 3 shows another modified example in which the shape of the upper nozzle brick 13 is different from that shown in FIG. 1.
This is an embodiment in which the nozzle brick 12 is located directly above the upper nozzle brick 13, and the features of the present invention are similar to those of the above-mentioned embodiment.
An upper nozzle brick 13 is attached to the nozzle receiving bricks 11, 12 which have been completed together with the nozzle receiving bricks 11, 12 (see the figure, not shown), and then a fixed plate brick 14 is set in place, after which a plug brick 16 is pushed into a plug receiving hole 19 for gas bubbling from the fixed plate brick 14 side with mortar 18. Then, the sliding plate brick 15 is attached, and the required SN device installation work is carried out, such as applying a surface pressure load between the fixed plate brick 14 and the sliding plate brick 15. For bubbling, a lower connecting pipe 10 is provided on the gas blowing pipe 8 of the plug brick 16 and the plug receiving brick 6-2, which communicates with a gas circulation pipe (not shown) on the outside of the vessel.

Although the plug receiving bricks 6 and 6-2 are used in the explanation in FIGS. 2 and 3, this part may be left as a gap;
However, the plug bricks 3 and 16 are installed so as to be in contact with the sliding plate, extending the entire length to match the buried location of the plug bricks 3, 16, and there is no problem in setting the position when the plug bricks 3 are fixed.

The molten metal container 1 that has completed the brick replacement work in this manner usually receives molten metal after a certain period of time. After receiving the steel, use Ar from the plug brick as necessary.
Inert gas (or oxygen) such as gas is blown into the molten metal to stir the molten metal and perform treatments such as equalizing the temperature of the molten metal and floating non-metallic inclusions. Thereafter, the sliding plate brick is slid and the molten metal is poured into an ingot or tundish through the outflow hole.

FIG. 4 shows an embodiment in which a conventional SN device C and an SN device D according to the present invention are attached to a molten metal container 1. With this arrangement, in addition to the above-mentioned effects, the SN device C can Even if an accident occurs during the casting operation, such as a drive failure, or if the lower nozzle brick is cracked, so-called normal casting operation becomes impossible, the sliding plate brick of the SN device D is driven. It has great advantages, such as being able to avoid loss of molten metal due to returning to the furnace or open injection.

Further, the plug brick described in the present invention may be a porous brick or a brick with a structure having pores, and there are no particular limitations on its shape, etc.

Effects of the Invention With the configuration described above, the present invention can achieve the following effects.

B In the present invention, the porous bubbling plug brick is not formed over the entire upper nozzle brick, but is formed separately parallel to the peripheral wall made of normal brick around the molten steel outflow hole. Therefore, only the top surface of the bubbling plug brick comes into contact with the molten steel and slag, and there is less wear due to pickling before receiving the steel. In addition, the molten steel outflow hole is
Since it is made of ordinary brick material, wear due to molten steel flow is not as severe as with porous material, so that the service life of the entire upper nozzle brick and the bubbling plug brick can be extended.

(b) Since the bubbling plug brick is detachably attached to the upper nozzle brick, the bubbling plug brick can be quickly replaced without removing the upper nozzle brick, and the efficiency of repair work can be improved.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing the conventional mounting state of the SN device and gas bubbling device to a tundish, etc.
Figure 2 is a sectional view of the main parts of the SN device according to the present invention, Figure 3 is a sectional view of the main parts of another modification, and Figure 4 is the conventional type.
FIG. 2 is a bottom view of an SN device and a tundish, etc. equipped with the SN device according to the present invention. In the figure, 1... Upper nozzle brick, 2... Molten metal outflow hole, 3... Plug brick, 4... Fixed plate brick, 5... Molten metal outflow hole, 6... Plug receiving brick, 6-1... ...Bubbling plug hole, 7...
Sliding plate brick, 8... Gas blowing pipe, 9... Mortar, 10... Connecting pipe, 11, 12... Nozzle receiving brick, 13... Upper nozzle brick, 14...
... Fixed plate brick, 15 ... Sliding plate brick, 16 ... Plug brick, 18 ... Mortar, 1
9...Bubbling plug hole, 20...Iron plate,
21...Bubbling plug hole.

Claims (1)

[Scope of utility model claims] In an upper nozzle brick for a sliding nozzle device installed at the bottom of a molten metal container and having a molten metal outflow hole inside, a bubbling plug receiving hole is provided in the peripheral wall of the upper nozzle brick in parallel with the molten metal outflow hole. An upper nozzle brick for a sliding nozzle device, characterized in that a bubbling plug brick having a blowout port for spouting gas into molten metal is removably fitted into the bubbling plug receiving hole. .