KR960001356Y1 - Filter type cover brick of continuously casting tundish - Google Patents

Abstract

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Description

Filter type cover of continuous tundish casting

1 is a perspective view of an example according to the present invention

2 is a plan view showing an example according to the present invention

3 is a front view showing an example according to the present invention

4 is an exemplary view showing a state of use of the subject innovation

5 is an exemplary view of a casting operation state according to the present invention

6 is a cross-sectional view illustrating an example of a state of use of a conventional yoke

(a) is a steel rudder and is a relative example of the use of a steel plug.

(b) is an illustration of the state of use of the surface and the elevated cover surface

(c) is an illustration of the state of use with the general cover edge

Figure 7 is an illustration of the casting operation state according to the conventional cover edge

* Explanation of symbols for main parts of the drawings

1: cover and 2: kite and body

3: filter rod 4: molten steel

5: inclusions 10: tundish

11: refractory 12: tundish sub (SUB) dam

13: upper nozzle 14: with

15: slide gate 16: lower nozzle

17: immersion nozzle 20: general cover lid

21: edge height cover surface and 22: steel tire plug

The present invention relates to a filter type cover edge of a continuous casting tundish, and in particular, a slide edge of a filter rod radially placed on a body having a hole in the center thereof, and a slide gate of a face casting machine. It is intended to improve quality, prevent clogging of nozzles, and reduce costs by assembling in a gate-type turn dish.

Refractories generated during the preliminary stage in the tundish solidify with the molten steel in the upper nozzle at the beginning of the casting process, causing nozzle clogging or refractory flows into the mold, resulting in poor quality and quality. Will be lowered.

In addition, at the end of the tundish exchange or at the end of the casting, the molten steel residue in the tundish is cast to the minimum amount, and the molten slag that is injured in the molten steel due to the vortex of the molten steel occurs at the top of the cover and the casting This can lead to poor quality as well as actual accidents.

The object of the present invention is to filter the refractory and molten slag in the molten steel by the filter rod so that it can not be mixed during the casting process to improve the quality of the quality and to eliminate the risk of equipment accidents.

Figures 6a, 6b, and 6c are shown among conventionally known technicians and one embodiment thereof is shown in figure 7. In the early stages of continuous casting installation, steel die plugs (22.aka StartlnTube) were placed on top of the upper nozzle (13, Upper Noz group e) as shown in Fig. 6A. In the preheating of 16), the upper nozzle 13 was closed and the refractory 11 was also mixed, resulting in a lot of accidents during the initial operation.

Thereafter, the method shown in FIG. 6B has been proposed. The refractory 11 made of a tubular lead and a height-type lid lead 21 of about 30 mm height was used in actual use, but the nozzle was frequently clogged by the refractory 11 introduced with molten steel. In the later stages, the slag caused by the vortex phenomena was also incorporated in more molten steel, leaving more residual water.

As a further modification, the general cover 20 is used as shown in FIG. 6C. However, since a large amount of refractory is initially mixed, problems such as clogging of the nozzle and deterioration of the quality of the nozzle may be caused. Due to the vortex phenomenon, there is a lot of mixing of slag.

The present invention aims to improve the quality by preventing the mixing of the refractory in the early stages as well as the end to prevent the clogging of the nozzle and to prevent the mixing of the slag by the vortex phenomenon.

This will be described in detail based on the accompanying drawings.

1 is a perspective view of an example of the lid edge 1 according to the present invention, and FIG. 2 is a plan view and a front view thereof.

Cover edge (1) of the present invention is that a plurality of filter rods (3) radially placed on the upper surface of the edge and the body (2) with a hole in the center, the filter rod (3) has an inner surface through It can be installed so as to contact the inner circumferential surface of the drilled hole, or protrude inwardly or fall outward.

In particular, the edge and the body (2) of the lid edge (1) may be integrally formed on the upper side of the upper nozzle (13).

The cover edge 1 of the present invention configured as described above is used by being installed as shown in FIGS. 4 and 5.

An upper nozzle 13 and a support lead 14 are integrally assembled inside the refractory 11 provided in the tundish 10, and a slide gate 15 and a lower nozzle are disposed below the upper nozzle 13. (16) and the immersion nozzle 17 in order to install, the cover edge (1) of the present invention is installed on the upper side of the upper nozzle (13) or the lead body (2) integral with the upper nozzle (13) You can do

Cover cover (1) of the present invention is to install approximately 16 filter rods, but the distance between the filter rods is about 20mm and the height is about 60mm and each corner of the filter rod is in the form of a square to prevent falling off when in contact with molten steel It is preferable. As shown in FIGS. 4 and 5, the cover kite (1) of the present invention is assembled on the upper nozzle (13) and the support kit (14), and the kite body (2) of the cover kite (1) is assembled. It is constructed with the refractory 11 so that the tundish 10 and the bottom coincide.

In the state where construction is bureaucratic, the tundish 10 is preheated to 1,100 ° to 1.200 ° and molten steel is cast. In this case, the refractory is scattered by the strong molten steel falling from the ladle at the cover and the bottom and wall of the tundish. (11) The mass is eliminated and the molten steel (4) is immersed together and flows to the upper nozzle (13), where various inclusions (5) such as those dropped from the refractory (11) as shown in FIG. It forms in (3), and only molten steel flows and enters the upper nozzle 13.

When the injection of the ladle is completed and the molten steel is cast in the tundish 10, the molten steel is lowered to about 200 to 300 mm and the vortex phenomenon occurs as it descends to the immersion nozzle 17 shown in FIG. The molten steel immediately flows in the respective directions between the filter rods 3 and is hindered by the filter rods 3, so that the vortex phenomenon is slowed or almost suppressed.

As such, according to the present invention, it is possible to prevent clogging of the upper nozzle at the beginning of casting, thereby preventing the early return of the molten steel ladle, preventing clogging of the nozzle by refractory material, as well as in the mold by oxygen washing. Prevent operation accidents caused by fluctuations in water surface. In addition, it is useful to prevent the mixing of refractory to improve the quality and to reduce the cost because it is possible to cast even the minimum amount during the tundish retreat work.

Claims (2)

Filter type cover edge of the continuous casting tundish (1) consisting of radially installed a plurality of filter rods (3) on the upper surface of the yeonwa body (2) through the hole through the center. 2. The filter rod (3) according to claim 1, wherein the filter rod (3) coincides with the inner circumferential surface of the through hole. Alternatively, the inner circumferential surface may be installed to be lifted inward or fall outward, and the kite and the body 2 may be formed integrally on the upper side of the upper nozzle 13, and the filter type cover edge of the continuous casting tundish (1).