JPS61293638A - Device for preventing bulging - Google Patents

Abstract

PURPOSE:To prevent the generation of bulging and to stably and continuously cast a thin sheet by supplying gas to the space between twin drums and box bodies having labyrinth seals from the box bodies so that the pressure in the space is balanced with the static pressure of a molten steel. CONSTITUTION:The sealing space 14 is formed of the box bodies 8, 8' having the labyrinth seals on the opposed surfaces of a pair of the horizontally and parallel disposed drums 1, 1' an ingot 3, the above-mentioned drums 1, 1', the ingot 3 and side sealing plates (not shown) in a twin drum type continuous casting machine for a thin sheet which yields the ingot 3 by rotating the drums 1, 1', cooling the molten metal in the space therebetween and joining the solidified shells formed on the surfaces of the drums 1, 1'. the pressure in the above- mentioned space 14 is fed as a pressure signal 10 back to a valve 11 which supplies the gas such as Ar or N2 from a gas supply source 12 via the above- mentioned box bodies 8, 8' to the space 14, thereby balancing the pressure in the sealing space with the static pressure up to a molten steel level 15.

Description

[Detailed description of the invention] [Industrial application field] The present invention is a twin-drum continuous thin plate casting machine.

In particular, the present invention relates to a bulging prevention device in a twin-drum continuous thin plate casting machine that requires narrowing to control the solidification thickness.

[Conventional technology]

Overview of the mechanism of conventional twin-drum continuous casting equipment Part 3
This will be explained based on the diagram. This device is.

Drums 1, 1/2 for casting thin plate slabs 5; side weirs 2, 2 for completely preventing leakage of molten metal 4 between these drums 1, 11;
The main components include a tundish 5 for storing molten metal 4 such as I and M steel.

To explain this device in detail, the drums 1 and 11 are installed horizontally and are driven to rotate (in the direction of the arrow) by a drive device (not shown). These drums 1 and 1' are made of copper, copper alloy, or steel, for example, and have a built-in water cooling mechanism, and have a considerably large diameter in order to have a large contact area with the molten metal 4. . Also drum 1.
A side weir @2,2/ made of a refractory material is pressed against both ends of the drum 1' to seal the entire side, and the two drums 1,11 and the two side weirs 2,2I Bath water 4 is poured into the space formed. Molten metal 4 is in drums 1 and 1
The solidified shell is formed by contacting the surface of the slab and is cooled, and then the solidified shell is integrated to form the slab 5.

[Conventional bulging prevention device]

By the way, as shown in FIG. 5, in the conventional twin-drum continuous casting apparatus, a pressure box 6t is installed to prevent bulging, and fluid is sprayed onto the slab 3 from a jetting lower. (Refer to Japanese Patent Application Laid-Open No. 59-118247.) Bulging is a state in which an unsolidified portion exists inside the slab 5 at the lower end of the drums 1, 11 (the position where the thickness of the slab 5 is determined, that is, the drum 1 , 1/) to the slab 5
When the molten steel comes out, the slab 3 swells due to the static pressure of the molten steel. Although the goal of operation is for solidification to just be completed at the bottom end of the drums 1, 11, bulging may occur due to disturbances in pouring or fluctuations in the molten steel level.

[Problem that the invention seeks to solve]

In order to prevent this bulging, in the conventional method pressure is applied using dynamic pressure (blowing pressure).

That is, in the conventional method, the fluid is simply sprayed onto the slab, and the bulging is suppressed by dynamic pressure at the 9 points where the fluid is sprayed, but it is not possible to uniformly apply pressure to the entire fs slab. In particular, the bottom end of the drum, where the most pressure is applied,
It is so narrow that a pressure box cannot fit inside and no pressure can be applied.

[Object of the present invention]

The object of the present invention is to provide a bulging prevention device for a twin-drum thin plate continuous casting machine that solves the above-mentioned problems.

[Configuration of the present invention]

In other words, the present invention provides a twin-drum type continuous thin plate casting machine in which a space is formed by a box body, a drum, a slab, and a side seal plate in which a labyrinth seal mechanism L is formed, and a space is formed between the box body and the drum, and A bulging prevention device having the following features: the labyrinth school mechanism is positioned facing the body and the slab, gas is supplied from the box body to the space, and the pressure in the space is balanced with the static pressure of the molten steel. It is.

The present invention will be described in detail below. In the present invention, a pressure box and a Tido seal plate are used to create a seal space at the lower end of the drum and maintain the pressure in this space. That is, by applying static pressure, pressure is applied to the entire slab and the next state is fully realized.

This pressure is the amount of gas supplied from the pressure box.

It is determined by the relationship with the pressure loss of the labyrinth seal mechanism formed between the pressure box and the drum, and between the pressure box and the slab, and it is easy to maintain the pressure at a predetermined value.

〔Example〕

FIG. 1 shows a bulging device which is an embodiment of the present invention;
FIG. 2 is a view taken along the line AA in FIG. 1.

In FIGS. 1 and 2, the same reference numerals as in FIG. 5 indicate the same parts as the fifth factor. In FIGS. 1 and 2, the pressure box 8
, 8/i Drum 1, 1/Located in parallel with slab 5 at the lower end, side seal plate at the end? is provided to completely form the seal space 14. Depending on the gas supply, valve 11 and pressure box 8, 8/
The gas supply source 12 and the υ gas (
For example, ^r, N2) is supplied. The pressure in the seal space 14 is fed back to the valve 11 as a pressure signal 10,
Valve 11 is adjusted to maintain a predetermined pressure. The pressure in the seal space 14 is controlled by the labyrinth seal 13.
It can be maintained at a predetermined pressure higher than atmospheric pressure. Although the amount of gas consumed depends on the performance of the labyrinth seal 15, it is easy to construct a labyrinth seal 15 that is sufficient for practical use. The pressure in the seal space 14 is set based on a 1 m molten steel rod (height from the seal space to the molten steel level 15).

[Effects of the present invention]

Since the present invention consists of one or more detailed configurations,
Even if a slab with unsolidified parts is pulled out from the drum, the pressure in the seal space is kept almost the same as in the m-steel head.

This has the effect of allowing stable operation without causing the slab to bulge or become thinner than a predetermined thickness. The present invention can be particularly advantageously applied to a twin-drum continuous casting apparatus in which it is necessary to control the solidity.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a bulging prevention device in a twin-drum continuous thin plate casting machine according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of FIG. 1. FIG. 5 is the next diagram illustrating the conventional twin-drum continuous thin plate casting apparatus and bulging prevention device. Sub-Agents 1) Meifuku Agent Ryo Hagiwara - Sub-Agent Atsuo Anzai Figure 3

Claims (1)

[Claims] In a twin-drum continuous thin plate casting machine, a space is formed by a box with a labyrinth seal mechanism, a drum, a slab, and a side seal plate, and the box and the drum face each other, and the box and the slab face each other. A bulging prevention device characterized in that the labyrinth seal mechanism is located in the space, gas is supplied from the box to the space, and the pressure in the space is balanced with the static pressure of molten steel.