JPH04224053A - Apparatus for continuously casting cast strip - Google Patents

Abstract

PURPOSE:To prevent breakage of scum weir set to the pouring basin part in a metal strip continuous caster caused by dipping into high temp. molten metal for long time. CONSTITUTION:The scum weir is constituted by joining refractory plate line setting plural refractory plates while arranging gaps for expanding and the other refractory plate line having the same structure as the above refractory plate line and setting while shifting the position of gaps as zigzag state. By setting the divided refractory plates while arranging the gaps, thermal expansion is reduced, and breakage of the refractory plate is prevented.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt-type or twin-drum type continuous metal ribbon casting apparatus, and more particularly to a scum weir disposed in a sump.

0002

[Prior Art] In an apparatus for continuously casting thin slabs,
When the molten metal is discharged from the pouring nozzle into the sump, the molten metal flow ripples the area near the meniscus where the molten metal contacts the cooling drum and deteriorates the surface quality of the slab. A technique for providing a scum weir between a cooling drum and a pouring nozzle to prevent ripples is disclosed in Japanese Patent Application Laid-Open No. 60-30555, Japanese Patent Application Laid-Open No. 61-165255, and the like.

0003

[Problem to be solved by the invention] By immersing the scum weir in the molten metal as described above, it is possible to prevent ripples in the meniscus and entrainment of metal oxides, casting powder, etc. floating on the molten metal surface. However, since such scum weirs are made of a single refractory plate and are immersed in high-temperature molten metal for a long time, they cannot withstand the internal forces generated by the difference in expansion within the refractory plate itself. This often results in damage.

0004

[Means for Solving the Problems] The present invention prevents damage to the scum weir by constructing the structure of the scum weir with double rows of refractory material divided in the axial direction of the cooling drum. A row of fireproof plates provided in the molten metal between the cooling drum and the pouring nozzle in the axial direction of the cooling drum with a gap at least equal to the expansion of the fireproof plates, and the row of fireproof plates. This continuous casting apparatus for thin slabs is provided with a scum weir formed by immersing and disposing a scum weir consisting of a row of refractory plates which are connected to each other and are shifted to a position that closes the gap.

[0005]

[Function] In the present invention, a plurality of fireproof plates are arranged in a length corresponding to the axial direction of the cooling drum with a gap greater than the expansion allowance of the fireproof plates, so that the expansion force of each fireproof plate is reduced. The expansion can be absorbed by the gap and damage to the refractory material can be prevented. In addition, since another row of the plurality of fireproof boards is connected to the fireproof board row and staggered in a staggered manner,
The gap is closed and no leakage occurs.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained based on the drawings. FIG. 1 is a front view showing the outline of the present invention. In the figure, molten metal 5 is discharged from a pouring nozzle 1 into a sump 4 constituted by cooling drums 2, 2 and side weirs 3, 3, and the cooling drum The molten metal 5 is cooled by the rotations 2 and 2, and the thin continuous pieces S are formed. 7 is a scum weir, which is suspended by a fixed plate 14. Details of the scum weir are shown in Figure 2. The fireproof plate 8 is fixed to a mounting plate 13 via a fireproof plate 9 using fixing devices 10 such as screws. A plurality of fireproof plates 8 are arranged in series in the axial direction of the cooling drum with gaps 11 in between to form a fireproof plate row. The fireproof boards 9 have the same structure as the fireproof boards 8 and are arranged in series to form a row of fireproof boards, but the fireproof boards are staggered relative to each other so that the gaps 12 between them do not overlap with the gaps 11 of the fireproof boards 8. It is arranged as follows. The mounting plate 13 is fixed to the scum weir fixing plate 14, and therefore, the scum weir 7 is fixed in a suspended state by the scum weir fixing plate 14 via the mounting plate 13. Reference numeral 15 denotes a fireproof heat insulating sheet, which is provided between the scum weir 7 and the mounting plate 13 to prevent the high temperature of the molten metal from being transmitted to the scum weir fixing plate 14.

Note that a gas sealing flow may be applied to a minute gap between the side edge of the scum weir 7 and the side weir to prevent floating objects from approaching the gap. 7 may be arranged on all sides, and adjacent side edges may be joined to eliminate gaps.

[0008]

[Effects of the Invention] Since the present invention has the above-described structure, each refractory plate has a small surface area, so the internal force due to thermal expansion can be reduced, so damage to the originally brittle refractory can be avoided. Expansion is absorbed by the gaps between the fireproof plates and changes in the length of the fireproof plate rows can be suppressed, making it possible to keep the gaps between the side edges of the fireproof plate rows to a minimum, and furthermore, the fireproof plate surface is small. This makes it possible to reduce manufacturing costs, and since it is possible to repair by replacing only the damaged fireproof plate, it is possible to reduce the total cost.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional front view showing an embodiment of the present invention.

FIG. 2 is a perspective view in the XX' direction of FIG. 1;

[Explanation of symbols]

1...Pouring nozzle 2...Cooling drum 3...Side weir 4... Hot water pool part 5...Molten metal 6...Meniscus 7...Scum weir 8...Fireproof board 9...Fireproof board 10...Mounting tool 11...Gap 12...Gap 13...Mounting plate 14...Scum weir fixed plate 15...Fireproof insulation sheet S...Thin slab

Claims (1)

[Claims] 1. A fireproof board row having a gap between a plurality of fireproof boards at least for the expansion allowance of the fireproof board, and a fireproof board row having the same structure as the fireproof board row, and whose gap position is the same as the gap position of the fireproof board row. A scum weir formed by joining other rows of fireproof plates placed at different positions is immersed in the molten metal in a pool formed by a pair of rotating cooling drums and a pair of side weirs. Continuous casting equipment for thin-walled slabs.