JPH0719653Y2 - Pressure chamber sealing device for pressure twin roll caster - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a pressure chamber sealing device for a pressure type twin roll continuous casting machine.

[Prior Art] Generally, in a twin roll type continuous casting machine, a pair of internally coolable rolls are horizontally arranged at a required interval, and an upper part between both ends of the pair of rolls is used as a side weir. Seal with a dam plate,
The molten metal is supplied to the upper part between the rolls sealed by the side dams to form a molten metal pool, and the roll is rotated so that the facing part moves downward, whereby the molten metal is cooled by the rolls and solidified on the roll surface. A shell is formed, and the solidified shell is drawn together with the molten metal from between the rolls to cast a slab.

However, in the conventional twin roll continuous casting machine described above, there is a problem that the solidified shell is largely deformed at the start of solidification, and thus the thickness of the cast piece is not uniform. As shown in the figure, a pressurizing chamber 3 having a wall portion 3a extending in the axial direction of the rolls 1 and 2 and a wall portion 3b extending along the side dam 12 is provided above the pair of rolls 1 and 2. Then, the gas supply port 4 is provided in the pressurizing chamber 3, and the pressurizing chamber 3 is supplied from the gas supply port 4.
The gas 5 is supplied to the inside, and the molten metal 9 in the molten metal pool 8 supplied from the tundish 6 and the core 7 at the lower end of the tundish 6 to the upper part between the rolls 1 and 2 is pressurized at a constant pressure to solidify the solidified shell at the start of solidification.
It is contemplated to prevent deformation of 11 and thereby cast a uniform slab 10.

Reference numeral 18 is a gas straightening plate provided in the pressurizing chamber 3 and provided with a large number of holes 19, and the side dam 12 can be moved backward on the upper side surfaces of the rolls 1 and 2 according to the thermal expansion of the rolls 1 and 2. Is provided in
The pressurizing chamber 3 is located above the side dam 12.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional pressurizing twin roll continuous casting machine, the pressurizing chamber 3 can be moved backward in response to the thermal expansion of the rotating rolls 1 and 2 and the rolls 1 and 2. Since it is provided for the movable member such as the side weir 12, it is difficult to maintain airtightness between them and the pressure chamber 3 and the roll 1, as shown in FIG.
Since a large amount of gas leaks from between the pressure chamber 3 and the side weir 12, etc., there is a problem that a sufficient pressure effect cannot be obtained.

In view of the above situation, the present invention prevents leakage of gas from the pressurizing chamber as much as possible by attaching a flexible seal to the lower end of the pressurizing chamber, and improves the pressurizing effect. Is intended.

[Means for Solving the Problems] In the present invention, a molten metal in a molten metal pool formed by the roll and side dams at both ends is provided above a pair of internally coolable rolls horizontally arranged with a required space. In a pressurizing twin roll continuous casting machine having a pressurizing chamber for pressurizing with gas pressure, a flexible thin plate-like gas seal is provided at the lower end of the pressurizing chamber facing the roll, and the lower end is the roll surface. And a pressure chamber sealing device of a pressure type twin roll continuous casting machine characterized in that the pressure chamber sealing device is attached to the roll gap side while being bent. The present invention relates to a pressure chamber sealing device of a pressure type twin roll continuous casting machine, characterized in that a wire brush-shaped gas seal is attached with its lower end slidably contacting the roll surface.

Further, in each of the pressure chamber sealing devices, a flexible thin plate-shaped gas seal is brought into contact with the inner side of the upper side weir of the lower end of the pressure chamber facing the side weir and is directed toward the inside of the pressure chamber. The flexible wire seal may be attached to the upper end of the side weir in a slidable contact with the lower end of the pressure chamber facing the side weir.

[Operation] Therefore, a flexible thin plate-like gas seal is attached to the lower end of the pressure chamber facing the roll by bending the lower end to the roll gap side while contacting the lower end with the roll surface. By doing so, the gas seal makes the roll easily slide without hindering the rotation of the roll, and urges it toward the roll by the repulsive force due to its bending against the gas in the pressure chamber and the pressure at the time of gas supply. Therefore, like a check valve, the gap between the pressurizing chamber and the roll is closed to prevent leakage. In addition, even if solid matter adheres to the roll surface, the gas seal bends and escapes, so that the roll outer peripheral surface and the gas seal itself are not damaged.

Further, a flexible wire brush-like gas seal is attached to the lower end of the pressure chamber facing the roll, and the lower end of the gas seal is slidably brought into contact with the roll surface.
The gas seal allows the roll to easily slide without hindering the rotation of the roll and prevents the gas in the pressurizing chamber from leaking by closing the gap between the pressurizing chamber and the roll. Moreover,
Even if solid matter adheres to the roll surface, the gas seal bends and escapes, so that the roll outer peripheral surface and the gas seal itself are not damaged.

Further, if a flexible thin-plate gas seal is brought into contact with the inside of the upper side dam and is bent toward the inside of the pressure chamber at the lower end of the pressure chamber facing the side dam, and is attached, The gas seal allows the side weir to slide easily without preventing the side weir that moves backward due to thermal expansion of the roll from sliding, and repulsive force against the gas in the pressurizing chamber due to its own bending, and at the time of gas supply. Since pressure is applied to the side weir, the gap between the pressurizing chamber and the side weir is closed so as to push the side weir outward, thereby preventing leakage.

Further, when a flexible wire brush-like gas seal is attached in slidable contact with the upper surface of the side weir at the lower end of the pressure chamber facing the side weir, the gas seal is The side weir can be easily slid without hindering the movement of the side weir that moves backward due to the thermal expansion of the roll, and the gas in the pressurizing chamber can be prevented from leaking by closing the gap between the pressurizing chamber and the side weir. prevent.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

1 to 3 show an embodiment of the present invention, which is shown in FIG.
The parts with the same reference numerals as in FIG. 7 represent the same things.

As shown in the figure, in the pressure type twin roll continuous casting machine 13 having substantially the same structure as the pressure type twin roll continuous casting machine shown in FIGS. 6 and 7, the lower end portion 14 of the wall portion 3a of the pressure chamber 3 is Inside, a thin plate-shaped gas seal 15 made of heat-resistant metal with the required flexibility.
The upper part of the wall part 3a is attached with the gas seal 15
It is designed to close the gap between 14 and rolls 1 and 2.

Here, the lower part of the gas seal 15 is in contact with the outer peripheral portions of the rolls 1 and 2 in a state of being bent along the outer peripheral surfaces of the gas seals 15 in the rotation direction of the rolls 1 and 2, and the repulsive force due to the bending. Also, the pressure when the gas 5 is supplied is biased toward the rolls 1 and 2.

Further, as shown in FIG. 2, the lower end portion 1 of the wall portion 3b of the pressurizing chamber 3 is
The upper portion of the gas seal 16 similar to that described above is attached to the inside of 4'to close the gap between the lower end portion 14 'of the wall portion 3b and the side weir 12.

Here, the lower portion of the gas seal 16 contacts the upper portion of the side weir 12 in a state of being bent toward the inside of the pressurizing chamber 3, and the side weir 12 has a repulsive force due to the bending and a pressure when the gas 5 is supplied.
Is urged to push outward.

The operation will be described below.

The gas seal 15 provided between the lower end 14 of the wall 3a of the pressurizing chamber 3 and the rolls 1 and 2 is directed toward the rotation direction of the rolls 1 and 2,
The rolls 1, 2
The rolls 1 and 2 can be easily slid without hindering the rotation and the gas 5 in the pressurizing chamber 3 is prevented from leaking by closing a gap like a check valve.

Further, as shown in FIG. 3, when solid matter 17 such as splash adheres to the outer peripheral surface of the roll 1, the gas seal 15
Due to the required flexibility, the gas seal 15 bends and escapes, and returns to the original state after passing the solid material 17.

Further, the gas seal 16 provided between the lower end 14 'of the wall 3b of the pressurizing chamber 3 and the side dam 12 is provided so as to push the side dam 12 outward by the repulsive force due to the bending and the pressure of the gas 5. Since the side weir 12 moves backward in response to the thermal expansion of the rolls 1 and 2 because it is energized, it follows the movement and closes the gap.

Therefore, according to the above configuration, the rotation of the rolls 1 and 2 is not hindered, and even if the solids 17 are attached to the rolls 1 and 2, the outer peripheral surfaces of the rolls 1 and 2 and the gas seal 15 itself can be damaged. Without this, leakage of the gas 5 can be prevented.

Further, it is possible to prevent the gas 5 from leaking by not hindering the backward movement of the side weir 12 and by continuing to close the gap following the movement thereof.

Further, since the leakage of the gas 5 is prevented as described above, the pressure loss of the pressurizing chamber 3 can be significantly reduced and the pressurizing effect can be greatly improved.

4 and 5 show another embodiment of the present invention.
The gas seal is composed of wire brush-like gas seals 15 'and 16' made of a heat-resistant metal having a required flexibility, and the upper part of the gas seal 15 'is located in the pressure chamber 3 facing the rolls 1 and 2. It is fixed inside the lower end 14 of the wall 3a, the lower part of the gas seal 15 'is brought into sliding contact with the upper part of the rolls 1 and 2, and the gas seal 16' is fixed in the pressurizing chamber 3. Lower end of wall 3b
It is fixed to 14 ', and the lower part of the gas seal 16' is brought into sliding contact with the upper surface of the side dam 12.

In this case as well, similar to the above-described embodiment, it is possible to prevent the gas 5 from leaking by closing the gap without hindering the rotation of the rolls 1 and 2 and the backward movement of the side dam 12.

The pressure chamber sealing device of the pressure type twin roll continuous casting machine according to the present invention is not limited to the above-mentioned embodiment, and a flexible thin plate-like member is formed at the lower end of the pressure chamber facing the roll. Of the present invention, a flexible wire brush-like gas seal may be attached to the lower end of the pressurizing chamber facing the side weir, and vice versa. Needless to say, various changes can be made without departing from the range.

[Effects of the Invention] As described above, according to the pressure chamber seal device of the pressure type twin roll continuous casting machine of the present invention, various excellent effects as described below can be obtained.

It is possible to prevent the gas from leaking without hindering the rotation of the roll and without damaging the outer peripheral surface of the roll and the gas seal itself even if solid matter is attached to the roll.

By adopting a configuration in which a gas seal is also attached to the lower end of the pressurizing chamber facing the side weir, it is possible to prevent gas leakage without hindering the movement of the side weir due to thermal expansion of the roll.

Due to the above, the pressure loss in the pressurizing chamber can be significantly reduced, and the pressurizing effect can be greatly improved.

[Brief description of drawings]

1 is a sectional view of an embodiment of the present invention, and FIG. 2 is a sectional view of FIG.
II-II direction arrow view, FIG. 3 is an enlarged view of part A of FIG. 1,
FIG. 4 is a sectional view of a gas seal installed along a roll according to another embodiment of the present invention, and FIG. 5 is a sectional view of a gas seal installed along a side weir of another embodiment of the present invention. FIG. 6 is a sectional view showing a conventional example, and FIG. 7 is a perspective view showing a conventional example. In the figure, 1 and 2 are rolls, 3 is a pressurizing chamber, 5 is gas, 8 is molten metal pool, 9 is molten metal, 12 is a side dam, 13 is a pressure type twin roll continuous casting machine, and 14 and 14 'are Lower end of pressure chamber, 15,15 ', 16,16'
Indicates a gas seal.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hisahiko Fukase 1 Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Ishi Kawashima Harima Heavy Industries Ltd. Technical Research Institute (72) Inventor Takao Tatezawa 3-chome, Toyosu, Koto-ku, Tokyo No. 15 Ishikawajima Harima Heavy Industries Co., Ltd. Technical Research Laboratory (56) Reference JP-A 1-271037 (JP, A) JP-A 62-130749 (JP, A)

Claims (4)

[Scope of utility model registration request] 1. A pressurization for pressurizing a molten metal in a molten metal pool formed by the roll and side dams at both ends with a gas pressure above a pair of internally coolable rolls arranged horizontally at a required interval. In a pressure type twin roll continuous casting machine equipped with a chamber,
A flexible thin plate-shaped gas seal is attached to the lower end of the pressurizing chamber facing the roll by bending the roll gap toward the roll gap and bringing the lower end into contact with the roll surface. Pressure chamber seal device for pressure twin roll continuous casting machine. 2. Pressurization for pressurizing the molten metal in a molten metal pool formed by the roll and side dams at both ends with a gas pressure above a pair of internally coolable rolls horizontally arranged with a required space. In a pressure type twin roll continuous casting machine equipped with a chamber,
A pressure type twin roll characterized in that a flexible wire brush-like gas seal is attached to the lower end of the pressure chamber facing the roll, with its lower end slidably contacting the roll surface. Pressure chamber sealing device for continuous casting machine. 3. A flexible thin plate-shaped gas seal is attached to the lower end of the pressurizing chamber facing the side dam by contacting the inside of the upper part of the side dam and bending toward the inside of the pressurizing chamber. 1. A pressure chamber sealing device for a pressure type twin roll continuous casting machine according to 1 or 2. 4. A flexible wire brush-like gas seal is attached to the lower end of the pressurizing chamber facing the side dam so as to slidably contact the upper surface of the side dam. Pressure chamber sealing device for pressure type twin roll continuous casting machine.