KR200184910Y1 - Apparatus for preventing the inflow of slag into the mold in the continuously casting machine - Google Patents

Abstract

The present invention relates to a device for quantifying the amount of tundish residual water and preventing slag flow into a mold during the end casting process during the continuous casting process, and to prevent the introduction of slag into the mold at the beginning and end of the casting during the continuous casting operation. The apparatus includes a well block having a conical injection space having a predetermined height, and a plurality of holes are formed along the circumferential surface of the well block to communicate with the injection space, thereby quantifying the amount of molten steel in the tundish. And prevent slag in-mold in the mold to prevent operation and equipment accidents in advance, and also contribute to cost reduction, and to secure a certain amount of molten steel in the tundish during tundish repair work. Can be.

Description

Apparatus for preventing the inflow of slag into the mold in the continuously casting machine}

The present invention relates to a device for quantifying the amount of tundish residual water and preventing slag inflow in the mold during the end-casting operation of the continuous casting process, in particular, the slag enters the mold in the end-casting operation by being mounted in the tundish on the upper nozzle. It relates to a device for preventing that.

In general, the continuous casting process is a process of continuously producing the cast while solidified in the cross-sectional shape of the mold as the molten steel injected from the tundish at the top flows downward through the mold.

That is, as shown in Figure 1, the molten steel tapped through the outlet of the blast furnace is precisely adjusted to the temperature and transferred to the columnar of the continuous casting machine by the ladle 1 to the tundish 2, which is an intermediate container Is injected. The molten steel in the tundish 2 is injected into the mold 5 under the tundish 2 through the deposition nozzle 4 and the like with the inclusions floating thereon.

At this time, since the mold 5 is cooled by the cooling water, the mold passing through the mold 5 gradually solidifies, and as a result, the lower end of the cast piece is solidified and fixed to the tip of the dummy bar previously supported on the bottom of the mold.

By pulling the dummy bar with a pinch roll, the solidified slab continuously descends, and the mold is vibrated up and down to prevent the slab from being attached to the mold. The cast steel drawn out from the mold is cut into a predetermined length by a gas cutter after being cooled in the secondary cooling stand.

On the other hand, during the end of the casting operation, as shown in Figure 3, when the operator checks the tundish residual water using the oxygen pipe (9) while notifying the strand worker of the completion of the strand worker will refer to this The final casting work is completed manually.

At this time, as shown in Figure 2, in the continuous casting operation to use the start cone (6) made of a circular iron plate for securing the molten steel in the initial casting tundish, which is often melted during the preheating of the tundish The function will be lost. In addition, during the end of the casting operation, the operator checks the amount of tundish residual water by using the oxygen pipe, and as a result, when the strand operator is notified of the completion of casting, the casting operation is completed manually.

In this process, due to a worker's misjudgment, the amount of residual water in the tundish is not constant, and the slag in the tundish is introduced into the mold as it is, causing an operation accident such as an equipment accident.

In addition, if a certain amount of molten steel in the tundish is not secured, the tundish removal work takes too much time during the tundish repair work, and the excessive cost in the tundish in order to prevent operation accidents causes enormous obstacles in cost reduction. What is needed is a method for quantifying the amount of residue in the dish.

In order to solve the conventional problems as described above, the present invention prevents the slag in the tundish inflow into the mold during the end of the casting operation to secure a certain amount of the tundish residual amount and quantify it to prevent excessive tundish now generation and operation It aims to provide a slag inflow prevention device that can contribute to cost reduction by reducing repair time during facility accident prevention and tundish repair work.

According to the present invention, in order to achieve the above object, the apparatus for preventing the introduction of slag into the mold at the beginning and end of the casting during the continuous casting operation includes a well block having a conical injection space of a predetermined height, the well A plurality of holes in communication with the injection space is formed along the circumferential surface of the block.

1 is a view showing a state in which molten steel is injected into a typical continuous casting machine.

2 is a view showing a state in which the start cone is mounted on the upper nozzle according to a conventional embodiment.

3 is a view showing a state in which the slag is introduced into the mold at the end of the casting according to a conventional embodiment.

4 is a cross-sectional view of a well block according to an embodiment of the present invention.

5 is a view illustrating a state in which molten steel is supplied through a well block according to an embodiment of the present invention.

6 is a view illustrating a state in which molten steel flows into a mold according to an embodiment of the present invention.

7 is a view illustrating a state in which molten steel flows into the mold at the end of casting according to an embodiment of the present invention.

<Description of Symbols for Major Parts of Drawings>

1: ladle

2: tundish

4: immersion nozzle

5: mold

13: iron cover

14: Hall

15: iron plate

16: well block

Hereinafter, a preferred embodiment of the present invention with reference to the accompanying drawings as follows, the same configuration adopts the same reference numerals.

According to an embodiment of the present invention, in order to prevent the inflow of slag in the final casting operation of the continuous casting process, a conical well block having a predetermined size and height and a hole having a predetermined size around the well block, It is composed of a well block that can be mounted in a tundish by attaching an iron plate to the lower hole of the well block to secure a constant hot water surface at the beginning of casting, and an automatic control system that can effectively block the inflow of slag into the mold.

A slag inlet prevention well block is installed on the upper nozzle in the tundish refractory in the end-casting mold. These well blocks are supported by tundish refractory and are paired with tundish slide gates.

In addition, as shown in Figs. 4 and 5, a hole 14 having a predetermined size and a well block 16 of a conical shape of a constant height, and a horizontal with the inner bottom surface of the tundish and has a rectangular shape One nozzle setting block 11.

Hereinafter, the operation of the present invention will be described in detail.

Technical state according to an embodiment of the present invention is as shown in Figure 7, the operation according to the present invention is as follows.

First, as shown in FIGS. 5 and 6, when the molten steel 10 in the tundish 2 decelerates and reaches a lower portion of the well block 16 on the upper nozzle 22, the molten steel in the tundish 10 The well block 16 is injected into several holes 14 below the well block and reaches the holes 14 of the well block 16 together with the slag 17 having poor fluidity in the tundish. Then, the molten steel injected into the mold 5 is reduced while the flow of molten steel is drastically reduced.

At this time, when the mold level (m / d level), for example, as shown in Figure 7, fall below 50mm at the zero point 30, or the opening degree of the tundish slide gate 115mm or more, the mold level The sensing device 19 detects this. Then, the tundish slide gate 12 is automatically closed by the end-of-cast automatic control system, thereby completing the casting operation and preventing the inflow of slag in the mold.

That is, when the molten steel in the tundish falls below the lower hole 14 of the nozzle well block 16, the slag and the molten steel in the tundish are impossible to be injected into the mold, so that casting is completed automatically.

Therefore, according to the present invention, it is possible to quantify the amount of molten steel in the tundish and prevent the inflow of slag in the mold to prevent operation and equipment accidents in advance, and contribute to cost reduction.

In addition, by securing a certain amount of molten steel in the tundish during the tundish repair work, it is possible to solve the difficulty in the tundish now processing.

The foregoing is merely illustrative of a preferred embodiment of the present invention to those skilled in the art to which the present invention pertains without departing from the spirit and spirit of the present invention described in the appended utility model claims without modification and changes to the present invention Recognize that you can.

Claims (2)

An apparatus for preventing the introduction of slag into the mold at the beginning and end of the casting during the continuous casting operation, A well block having a conical injection space of a predetermined height, Slag inflow prevention device characterized in that a plurality of holes in communication with the injection space is formed along the circumferential surface of the well block. The slag inflow prevention apparatus according to claim 1, wherein an iron plate for closing the hole at the beginning of the casting is mounted on an outer circumferential surface of the well block.