JP4610787B2 - Twin drum continuous casting machine - Google Patents

Twin drum continuous casting machine Download PDF

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Publication number
JP4610787B2
JP4610787B2 JP2001149762A JP2001149762A JP4610787B2 JP 4610787 B2 JP4610787 B2 JP 4610787B2 JP 2001149762 A JP2001149762 A JP 2001149762A JP 2001149762 A JP2001149762 A JP 2001149762A JP 4610787 B2 JP4610787 B2 JP 4610787B2
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Japan
Prior art keywords
scum
weir
drum
hot water
seal
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JP2001149762A
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JP2002346702A (en
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秀毅 岡
弘 伊崎
勝義 三宅
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Mitsubishi Heavy Industries Ltd
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Mitsubishi Heavy Industries Ltd
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Description

【0001】
【発明の属する技術分野】
本発明は薄帯鋳片を連続鋳造する双ドラム式連続鋳造装置に関わり、特に湯溜り部に配設するスカム堰の駆動装置に関する。
【0002】
【従来の技術】
双ドラム式連続鋳造装置は一対の冷却ドラムの両端面に一対のサイド堰を押し付けて湯溜まり部を形成し、湯溜まり部に注湯ノズルを通して溶鋼を供給し、一対の冷却ドラムの周面で凝固シェルを生成させ、一対の冷却ドラムを互いに内側に回転させて凝固シェルをドラムキス点で圧着して薄帯鋳片を鋳造するものである。
このような鋳造装置においては、湯溜まり部の溶鋼表面に溶鋼の酸化物や介在物などがスカムとなって浮遊し、このスカムが凝固シェルに巻き込まれると鋳片に表面欠陥が発生する。
【0003】
スカムの生成を防止する方法として、湯溜まり部をシールチャンバーで覆い、該チャンバー内をアルゴンや窒素などの非酸化性ガスで満たすことにより溶鋼の酸化を防止する方法が、例えば特開平10−263756号公報により知られている。
【0004】
また、スカムの凝固シェルへの巻き込みを防止する方法として、湯溜まり部の注湯ノズルを挟んでドラム幅方向に延びた一対のスカム堰を溶鋼に浸漬して設け、スカム堰によって流動するスカムを堰き止める方法が、例えば特開平4−158959号公報により知られている。
【0005】
【発明が解決しようとする課題】
一方、鋳造速度を変更する方法として、湯溜まり部の湯面レベルを上下に調整する方法が行われる。この場合、湯面レベルに合わせてスカム堰の昇降を行うが、前記特開平10−263756号公報に記載の装置はスカム堰の昇降方向が電動ジャッキによる直線方向であるため、図4に示すように、湯面レベルがb位置からa位置に上昇し、それに合わせてスカム堰を上昇させた場合は、スカム堰5とドラム周面の間隙がdからd1へと拡大する。
【0006】
該間隙が拡大すると、この間の溶鋼表面積が拡大するので、溶鋼表面に浮遊するスカム量が多くなり、凝固シェルに巻き込まれるスカム量も多くなる。一方、湯面レベルがb位置からc位置に低下し、それに合わせてスカム堰を低下させた場合は、スカム堰5とドラム周面の間隙がdからd2へと縮小する。該間隙が縮小すると、この間の溶鋼表面は、溶鋼から露出した冷却ドラム1とスカム堰5により冷却されて凝固膜が発生し、凝固膜がドラムメニスカス近傍の初期凝固を乱して鋳片に表面欠陥が発生する。
【0007】
さらには、スカム堰昇降装置の設置位置の問題として、湯溜まり部の上方空間は、湯溜まり部の溶鋼とタンディッシュ(図示略)の溶鋼に挟まれているために高温であり、そのため、この部分にスカム堰の昇降装置を設けると、装置は熱変形などにより作動不良を起こすおそれがある。また、湯溜まり部上方にはシールチャンバーが設けられるため、タンディッシュ底壁との空間が狭く、空間を大きくした場合は、長大な注湯ノズルを取り付けなければならないという問題がある。
【0008】
本発明は、湯面レベルの変化及びスカム堰の昇降に伴って発生する鋳片の品質不良、及びスカム堰昇降装置の高温による損傷や設置スペースの問題を解決することを課題とする。また、前記課題を解決する装置を設けた場合に発生する後述の湯溜まり部のガスシール効率の低下の問題を解決することを課題とする。
【0009】
【課題を解決するための手段】
前記湯面レベルの変化及びスカム堰の昇降に伴って発生する鋳片の品質不良、及びスカム堰昇降装置の高温による損傷や設置スペースの問題を解決する手段は、1)一対の冷却ドラム間の上部空間に形成された湯溜まり部にドラム幅方向に延びた一対のスカム堰と前記湯溜まり部を覆うと共に非酸化性ガスのガス導管を持つシールチャンバーを設けた装置において、前記一対の冷却ドラムの上方に前記シールチャンバーに連なる開口を持つシールケースを固定して設け、該シールケース内の両側面に前記冷却ドラムの半径に前記スカム堰とドラム周面間の距離を加えた半径を持つ複数のガイド溝が垂直面内で形成されたガイド部材を固定して設け、前記複数のガイド溝に堰支持アームの両側部に取り付けたガイドローラを係合させて設け、該堰支持アームの先端に前記スカム堰を固定して設け、該堰支持アームの基端に駆動シリンダーのロッドを連結ピンにより軸支して設け、該駆動シリンダーを前記シールケース内の奥部に固定された固定部材に連結ピンにより軸支して設け、前記駆動シリンダー及び堰支持アームは垂直面内で円弧移動可能であるスカム堰駆動装置を設けたことを特徴とする双ドラム式連続鋳造装置である。
【0010】
前記装置において、湯溜まり部のシール効率の低下の問題を解決する手段は、2)前記装置において、前記シールケースの開口に該開口を塞ぐ蛇腹式シール壁を設けたことを特徴とする双ドラム式連続鋳造装置である。
【0011】
【発明の実施の形態】
以下、図面を参照して本発明の実施の形態を説明する。図1は双ドラム式連続鋳造装置に本発明装置を適用した側断面図(図2のA−A’線視図)であり、図2は図1のB−B’線視平面図(一部断面図)であり、ドラム間隙Gを境にして左右同一の構造であるため該間隙を境にして左側のみを図示して説明する。各図において、互いに内側に回転する一対の冷却ドラム1、1の両端面には一対のサイド堰2、2が押し付けられて湯溜まり部3が形成されており、湯溜まり部3には一対のスカム堰5が設けられている。
【0012】
一対のスカム堰5は、湯溜まり部3のドラム幅方向に長大で溶鋼mに浸漬されており、溶鋼表面に浮遊するスカムのドラム側への流動を堰き止める。シールチャンバー6は湯溜まり部3の上方空間を気密に覆い、ガス導管7から窒素やアルゴンなどの非酸化性ガスが供給されることで溶鋼mの酸化を防止する。スカム堰駆動装置8のシールケース9はシールチャンバー6と連なる部位に開口10を持ち、一端を受台11に支持され、他端のドラム周面との間にはシールパッド12が挿入されてシールチャンバー6をシールしている。
【0013】
シールケース9内の両側面に設けられた一対のガイド部材13には円弧状のガイド溝14、14が設けられており、ガイド溝14、14の円弧は、冷却ドラムの半径rにスカム堰下端5aとドラム周面1aの間の距離kを加えた半径により形成されている。円弧状のガイド溝14、14には堰支持アーム15の左右に取り付けられたガイドローラ16が係合されており、堰支持アーム15の先端はスカム堰5に固定されている。堰支持アーム15の基端は駆動シリンダー17のロッド17aに連結ピン18により軸支されており、駆動シリンダー17はシールケース9の奥部に固定された固定部材20に連結ピン19により軸支されており、駆動シリンダー17及び堰支持アーム15は垂直面内で円弧移動可能である。
【0014】
蛇腹式シール壁21はシールケースの開口10を塞ぐことによりシールチャンバー6のシール性を高めるものであり、例えばシリコンガラスクロスに200℃の温度に耐え得る耐熱性のシリコンゴムコ―キングを施したものであり、シールケース9と堰支持アーム15に気密に取り付けられている。
【0015】
次に、本発明装置の作動状況について説明する。鋳造開始前に、シールチャンバー6及びシールケース9内に、非酸化性ガスを供給して内部の空気を非酸化性ガスに置換する。このとき、シールケースの開口10を塞ぐ蛇腹式シール壁21が設けられていない場合は、シールケース9内の空間についてもガス置換をすることになるため、ガス置換をする空間容積が大きくてガス置換効率が悪いばかりでなく、駆動シリンダー17、ガイドローラ16、堰支持アーム15などのシールケース9に内臓されている機器の周辺に澱み滞留する空気の置換は容易ではない。その結果、非酸化性ガスを多量に供給してもシールケース9の隅々までを容易に充満置換できないため、湯溜まり部空間をスカム発生防止のために必要な酸素濃度以下に低減することができない。
【0016】
本発明装置ではシールケースの開口10を塞ぐ蛇腹式シール壁21が設けられているため、シール空間の容積が低減する。また、機器周辺の滞留空間を排除したことにより、ガス置換効率が向上するので、少ない量の非酸化性ガスの供給により、シールチャンバー6内の酸素濃度を迅速に、所望濃度まで低減することができる。
【0017】
次に鋳造中において、例えば湯面レベルの上昇に伴ってスカム堰5を上昇させる場合は、駆動シリンダー17を縮動させると、堰支持アーム15の左右に取り付けられたガイドローラ16がガイド溝14に案内されて上昇し、堰支持アーム15はA位置からB位置へと上昇する。このとき、ガイド溝14の円弧は、冷却ドラムの半径rにスカム堰下端5aとドラム周面1aの間の距離kを加えた半径により形成されているので、図3に示すように、スカム堰5は前記半径を持つ円弧線Rに沿って上昇する。
【0018】
その結果、湯面レベルがb位置からa位置に上昇し、それに合わせてスカム堰下端5aをc位置からb位置に上昇させる場合、従来のようにスカム堰を直線上で上昇させると、湯面レベルにおけるドラム周面とスカムの間隙はd+sからd1+sに拡大するが、本発明ではスカム堰下端5aが円弧線Rに沿って上昇するため、間隙はd+sからd1に拡大するだけで、拡大量が従来との差sだけ小さくなる。その結果、従来と比べてスカムの発生する溶鋼面積が小さいのでスカムの発生量も少なく、凝固シェルに巻き込まれるスカム量も少なくなる。
【0019】
一方、湯面レベルがa位置からb位置に低下し、それに合わせてスカム堰下端5をb位置からc位置に低下させる場合、従来のようにスカム堰を直線上で低下させると、湯面レベルにおける間隙はd1+sからd+sに縮小するが、本発明ではスカム堰下端5aが円弧線Rに沿って低下するため、間隙はd1からd+sに縮小するだけで、縮小量が従来との差sだけ小さくなる。その結果、図4で説明したように、間隙が縮小したことにより、この間の溶鋼表面が溶鋼から露出した冷却ドラムとスカム堰により冷却されて溶鋼表面に凝固膜が発生し、凝固膜がドラムメニスカス近傍の初期凝固を乱して鋳片に表面欠陥が発生する問題を回避することができる。
【0020】
鋳造時間が長時間に及ぶと、湯溜まり部3とタンディッシュ(図示略)の間は高温となり、この部位にスカム堰駆動装置が設置されていると、スカム堰駆動装置は作動不良を起こしたり熱損傷するが、本発明ではスカム堰駆動装置は冷却ドラムの上方に設置されているため、上記問題の発生を回避することができる。
【0021】
【発明の効果】
本発明のスカム堰駆動装置は、スカム堰下端をドラム円周面と平行な円弧線に沿って昇降させることができるので、湯面レベルの変更に合わせてスカム堰を上昇させたとき、湯面レベルにおけるドラム周面とスカム堰の間隙の拡大を小さく抑えることができる。その結果、間隙の拡大によりスカム発生面積が拡大し、スカム発生量が多くなって凝固シェルに巻き込まれるスカム量が多くなるといった問題を回避することができる。
【0022】
また、湯面レベルの変更に合わせてスカム堰を低下させたとき、湯面レベルにおけるドラム周面とスカム堰の間隙の縮小を小さく抑えることができる。その結果、間隙の縮小により、この間の溶鋼表面が溶鋼から露出した冷却ドラムとスカム堰により冷却されて溶鋼表面に凝固膜が発生し、凝固膜がドラムメニスカス近傍の初期凝固を乱して鋳片に表面欠陥が発生するといった問題を回避することができる。
【0023】
本発明のスカム堰駆動装置は、高温で且つ設置スペースが小さい湯溜まり部上方を避けて冷却ドラムの上方に設けることができるので、装置の高温による損傷及び設置スペースの問題を解決することができる。さらには、本発明のスカム堰駆動装置は、内部空間をシールチャンバーの内部空間と分断して設けたので、シールの不要なスカム堰駆動装置の内部空間に非酸化性ガスを充満させなくてもよいから、ガスシールを効率よく行うことができる。
【図面の簡単な説明】
【図1】双ドラム式連続鋳造装置に本発明装置を適用した側断面図(図2のA−A’線視図)。
【図2】図1のB−B’線視平面図(一部断面図)。
【図3】本発明装置におけるスカム堰の昇降軌跡を示す図。
【図4】従来装置における問題点を説明する図。
【符号の説明】
1…冷却ドラム
1a…ドラム周面
2…サイド堰
3…湯溜まり部
4…注湯ノズル
4a…注湯ノズルの溶鋼吐出孔
5…スカム堰
6…シールチャンバー
7…ガス導管
8…スカム堰駆動装置
9…シールケース
10…開口
11…受台
12…シールパッド
13…ガイド部材
14…円弧状のガイド溝
15…堰支持アーム
16…ガイドローラ
17…駆動シリンダー
18…連結ピン
19…連結ピン
20…固定部材
21…蛇腹式シール壁
m…溶鋼
g…凝固シェル
kp…ドラムキス点
G…ドラム間隙
d,d1,d2…スカム堰とドラム周面の間隙
s…従来との間隙差
R…円弧線(スカム堰の昇降軌跡)
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a twin-drum type continuous casting apparatus for continuously casting a thin strip slab, and more particularly to a drive device for a scum weir disposed in a hot water reservoir.
[0002]
[Prior art]
The twin-drum type continuous casting apparatus forms a hot water pool by pressing a pair of side weirs against both end faces of a pair of cooling drums, and supplies molten steel to the hot water pool through a pouring nozzle. A solidified shell is generated, a pair of cooling drums are rotated inward, and the solidified shell is pressure-bonded at a drum kiss point to cast a strip cast piece.
In such a casting apparatus, molten steel oxides and inclusions float as scum on the surface of the molten steel in the pool portion, and when this scum is caught in the solidified shell, a surface defect occurs in the cast piece.
[0003]
As a method for preventing the formation of scum, a method for preventing oxidation of molten steel by covering a hot water reservoir with a seal chamber and filling the chamber with a non-oxidizing gas such as argon or nitrogen is disclosed in, for example, Japanese Patent Laid-Open No. 10-263756. Is known from the Gazette.
[0004]
Also, as a method of preventing the scum from getting caught in the solidified shell, a pair of scum weirs extending in the drum width direction across the pouring nozzle of the hot water pool portion are immersed in the molten steel, and the scum flowing by the scum weir is provided. A damming method is known, for example, from Japanese Patent Application Laid-Open No. 4-158959.
[0005]
[Problems to be solved by the invention]
On the other hand, as a method of changing the casting speed, a method of adjusting the hot water surface level of the hot water pool portion up and down is performed. In this case, the scum weir is moved up and down in accordance with the level of the hot water surface. However, in the apparatus described in Japanese Patent Laid-Open No. 10-263756, as shown in FIG. In addition, when the level of the molten metal rises from the position b to the position a and the scum weir is raised accordingly, the gap between the scum weir 5 and the drum peripheral surface increases from d to d1.
[0006]
When the gap increases, the surface area of the molten steel increases, so that the amount of scum that floats on the surface of the molten steel increases and the amount of scum that is caught in the solidified shell also increases. On the other hand, when the molten metal surface level is lowered from the b position to the c position and the scum weir is lowered accordingly, the gap between the scum weir 5 and the drum peripheral surface is reduced from d to d2. When the gap is reduced, the surface of the molten steel is cooled by the cooling drum 1 and the scum weir 5 exposed from the molten steel to generate a solidified film, which disturbs the initial solidification in the vicinity of the drum meniscus, Defects occur.
[0007]
Furthermore, as a problem of the installation position of the scum weir lifting device, the upper space of the hot water reservoir is hot because it is sandwiched between the molten steel of the hot water reservoir and the molten steel of the tundish (not shown). If a lifting / lowering device for the scum weir is provided in the part, the device may cause malfunction due to thermal deformation or the like. In addition, since a seal chamber is provided above the hot water reservoir, there is a problem that the space with the tundish bottom wall is narrow, and when the space is enlarged, a long pouring nozzle must be attached.
[0008]
This invention makes it a subject to solve the problem of the quality defect of the slab which generate | occur | produces with the change of a molten metal surface level and raising / lowering of a scum dam, the damage by the high temperature of a scum dam raising / lowering device, and the problem of installation space. It is another object of the present invention to solve the problem of a decrease in gas seal efficiency of a hot water pool portion, which will be described later, which occurs when a device that solves the above problems is provided.
[0009]
[Means for Solving the Problems]
Means for solving the problem of the quality change of the slab caused by the change of the molten metal level and the raising and lowering of the scum weir, and the damage due to the high temperature of the scum weir raising and lowering device and the problem of the installation space are as follows. A pair of cooling drums, wherein a pair of scum weirs extending in the drum width direction and a seal chamber covering the hot water reservoir and having a gas conduit for non-oxidizing gas are provided in a hot water reservoir formed in an upper space. A seal case having an opening connected to the seal chamber is fixedly provided above, and a plurality of radiuses obtained by adding the distance between the scum weir and the drum peripheral surface to the radius of the cooling drum on both side surfaces in the seal case A guide member formed in a vertical plane is fixedly provided, and guide rollers attached to both sides of the weir support arm are engaged with the plurality of guide grooves. Provided to fix the scum dams on the tip of the support arm, provided with pivotally supported by the connecting pin rod driving cylinder to the proximal end of the weir supporting arm, it is fixed to the drive cylinder in the back portion within the seal case A twin-drum type continuous casting apparatus provided with a scum weir driving device which is provided on a fixed member and supported by a connecting pin , and wherein the drive cylinder and the weir support arm are movable in a circular arc in a vertical plane. .
[0010]
In the above apparatus, the means for solving the problem of decrease in the sealing efficiency of the hot water reservoir is 2) In the apparatus, a bellows type sealing wall for closing the opening is provided in the opening of the sealing case. This is a continuous casting machine.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side sectional view (a view taken along line AA ′ in FIG. 2) in which the apparatus of the present invention is applied to a twin drum type continuous casting apparatus, and FIG. 2 is a plan view taken along line BB ′ in FIG. Since the structure is the same on the left and right sides of the drum gap G, only the left side of the gap will be illustrated and described. In each figure, a pair of side weirs 2, 2 are pressed against both end surfaces of a pair of cooling drums 1, 1 that rotate inward, and a hot water reservoir 3 is formed. A scum weir 5 is provided.
[0012]
The pair of scum weirs 5 is long in the drum width direction of the hot water reservoir 3 and is immersed in the molten steel m, and blocks the flow of scum floating on the molten steel surface to the drum side. The seal chamber 6 covers the space above the hot water reservoir 3 in an airtight manner, and a non-oxidizing gas such as nitrogen or argon is supplied from the gas conduit 7 to prevent the molten steel m from being oxidized. The seal case 9 of the scum weir driving device 8 has an opening 10 at a portion connected to the seal chamber 6, one end is supported by the receiving base 11, and a seal pad 12 is inserted between the other end and the drum peripheral surface to seal the seal case 9. The chamber 6 is sealed.
[0013]
A pair of guide members 13 provided on both side surfaces in the seal case 9 are provided with arc-shaped guide grooves 14, 14. The arcs of the guide grooves 14, 14 are arranged at the radius r of the cooling drum and at the lower end of the scum weir. It is formed by a radius including a distance k between 5a and the drum peripheral surface 1a. Guide rollers 16 attached to the left and right of the weir support arm 15 are engaged with the arcuate guide grooves 14, 14, and the tip of the weir support arm 15 is fixed to the scum weir 5. The base end of the weir support arm 15 is pivotally supported by the connecting pin 18 on the rod 17a of the driving cylinder 17, and the driving cylinder 17 is pivotally supported by the fixing member 20 fixed to the inner part of the seal case 9 by the connecting pin 19. The drive cylinder 17 and the weir support arm 15 are movable in a circular arc in a vertical plane.
[0014]
The bellows-type seal wall 21 enhances the sealing performance of the seal chamber 6 by closing the opening 10 of the seal case. For example, a silicon glass cloth is subjected to heat-resistant silicon rubber coking that can withstand a temperature of 200 ° C. It is attached to the seal case 9 and the weir support arm 15 in an airtight manner.
[0015]
Next, the operation status of the device of the present invention will be described. Before the start of casting, non-oxidizing gas is supplied into the seal chamber 6 and the seal case 9 to replace the air inside with non-oxidizing gas. At this time, when the bellows-type seal wall 21 that closes the opening 10 of the seal case is not provided, the space in the seal case 9 is also replaced with gas. Not only is the replacement efficiency poor, but it is not easy to replace air stagnant around the devices built in the seal case 9 such as the drive cylinder 17, guide roller 16, and weir support arm 15. As a result, even if a large amount of non-oxidizing gas is supplied, every corner of the seal case 9 cannot be filled and replaced easily, so that the hot water pool space can be reduced below the oxygen concentration necessary to prevent scum generation. Can not.
[0016]
In the apparatus of the present invention, since the bellows type seal wall 21 that closes the opening 10 of the seal case is provided, the volume of the seal space is reduced. Further, since the gas replacement efficiency is improved by eliminating the staying space around the equipment, the oxygen concentration in the seal chamber 6 can be rapidly reduced to the desired concentration by supplying a small amount of non-oxidizing gas. it can.
[0017]
Next, during the casting, for example, when the scum weir 5 is raised as the molten metal level rises, when the drive cylinder 17 is contracted, the guide rollers 16 attached to the left and right of the weir support arm 15 are guided by the guide grooves 14. The weir support arm 15 rises from the A position to the B position. At this time, the arc of the guide groove 14 is formed by a radius obtained by adding the distance k between the scum weir lower end 5a and the drum peripheral surface 1a to the radius r of the cooling drum, so as shown in FIG. 5 rises along the arc R having the radius.
[0018]
As a result, when the hot water level rises from the b position to the a position and the scum weir lower end 5a is raised from the c position to the b position accordingly, The gap between the drum peripheral surface and the scum at the level increases from d + s to d1 + s. However, in the present invention, since the scum weir lower end 5a rises along the arc R, the gap increases only from d + s to d1. The difference s from the prior art is reduced. As a result, since the molten steel area where scum is generated is smaller than in the conventional case, the amount of scum generated is small, and the amount of scum caught in the solidified shell is also reduced.
[0019]
On the other hand, when the molten metal surface level is lowered from the a position to the b position and the scum weir lower end 5 is lowered from the b position to the c position accordingly, In the present invention, the scum weir lower end 5a is lowered along the arc R, so that the gap is reduced only from d1 to d + s. The difference s is reduced. As a result, as described with reference to FIG. 4, since the gap is reduced, the surface of the molten steel is cooled by the cooling drum and the scum weir exposed from the molten steel, and a solidified film is generated on the surface of the molten steel. It is possible to avoid the problem of disturbing the initial solidification in the vicinity and causing surface defects in the slab.
[0020]
If the casting time takes a long time, the temperature between the hot water reservoir 3 and the tundish (not shown) becomes high. If the scum weir driving device is installed in this part, the scum weir driving device may cause malfunction. Although heat damage occurs, in the present invention, since the scum weir driving device is installed above the cooling drum, the occurrence of the above problem can be avoided.
[0021]
【The invention's effect】
Since the scum weir drive device of the present invention can move the lower end of the scum weir along an arc line parallel to the drum circumferential surface, when the scum weir is raised in accordance with the change of the molten metal level, The expansion of the gap between the drum peripheral surface and the scum weir at the level can be suppressed small. As a result, it is possible to avoid the problem that the scum generation area is expanded due to the expansion of the gap, the scum generation amount is increased, and the scum amount caught in the solidified shell is increased.
[0022]
Further, when the scum weir is lowered in accordance with the change in the hot water level, the reduction in the gap between the drum peripheral surface and the scum weir at the hot water level can be suppressed to a small level. As a result, due to the reduction of the gap, the molten steel surface in the meantime is cooled by the cooling drum and scum weir exposed from the molten steel, and a solidified film is generated on the molten steel surface, and the solidified film disturbs the initial solidification in the vicinity of the drum meniscus and Thus, problems such as surface defects can be avoided.
[0023]
Since the scum weir drive device of the present invention can be provided above the cooling drum while avoiding the hot water reservoir portion where the installation space is small and the temperature is small, it is possible to solve the problem of the damage due to the high temperature of the device and the problem of the installation space. . Furthermore, since the scum weir drive device of the present invention is provided by dividing the internal space from the internal space of the seal chamber, the internal space of the scum weir drive device that does not require sealing need not be filled with non-oxidizing gas. Therefore, gas sealing can be performed efficiently.
[Brief description of the drawings]
FIG. 1 is a side cross-sectional view (a view taken along line AA ′ of FIG. 2) in which the device of the present invention is applied to a twin drum type continuous casting device.
FIG. 2 is a plan view (partial cross-sectional view) taken along line BB ′ of FIG.
FIG. 3 is a diagram showing a lifting trajectory of a scum weir in the device of the present invention.
FIG. 4 is a diagram for explaining a problem in a conventional apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Cooling drum 1a ... Drum peripheral surface 2 ... Side dam 3 ... Hot water pool part 4 ... Pouring nozzle 4a ... Molten steel discharge hole 5 of pouring nozzle ... Scum dam 6 ... Seal chamber 7 ... Gas conduit 8 ... Scum dam drive device DESCRIPTION OF SYMBOLS 9 ... Seal case 10 ... Opening 11 ... Receptacle 12 ... Seal pad 13 ... Guide member 14 ... Arc-shaped guide groove 15 ... Weir support arm 16 ... Guide roller 17 ... Drive cylinder 18 ... Connection pin 19 ... Connection pin 20 ... Fixed Member 21 ... Bellows seal wall m ... Molten steel g ... Solidified shell kp ... Drum kiss point G ... Drum gaps d, d1, d2 ... Scum weir and drum peripheral gap s ... Conventional gap difference R ... Arc line (scum weir Up and down trajectory)

Claims (2)

一対の冷却ドラム間の上部空間に形成された湯溜まり部にドラム幅方向に延びた一対のスカム堰と前記湯溜まり部を覆うと共に非酸化性ガスのガス導管を持つシールチャンバーを設けた装置において、前記一対の冷却ドラムの上方に前記シールチャンバーに連なる開口を持つシールケースを固定して設け、該シールケース内の両側面に前記冷却ドラムの半径に前記スカム堰とドラム周面間の距離を加えた半径を持つ複数のガイド溝が垂直面内で形成されたガイド部材を固定して設け、前記複数のガイド溝に堰支持アームの両側部に取り付けたガイドローラを係合させて設け、該堰支持アームの先端に前記スカム堰を固定して設け、該堰支持アームの基端に駆動シリンダーのロッドを連結ピンにより軸支して設け、該駆動シリンダーを前記シールケース内の奥部に固定された固定部材に連結ピンにより軸支して設け、前記駆動シリンダー及び堰支持アームは垂直面内で円弧移動可能であるスカム堰駆動装置を設けたことを特徴とする双ドラム式連続鋳造装置。An apparatus in which a hot water reservoir formed in an upper space between a pair of cooling drums is provided with a pair of scum weirs extending in the drum width direction and a seal chamber that covers the hot water reservoir and has a gas conduit for non-oxidizing gas A sealing case having an opening connected to the sealing chamber is fixed above the pair of cooling drums, and the distance between the scum weir and the drum peripheral surface is set to the radius of the cooling drum on both side surfaces of the sealing case. A plurality of guide grooves having an added radius are provided by fixing guide members formed in a vertical plane, and guide rollers attached to both sides of the weir support arm are engaged with the plurality of guide grooves, provided to fix the scum dams on the tip of the weir supporting arms, provided pivotally supported by a connecting pin rod driving cylinder to the proximal end of the weir supporting arm, the sea the drive cylinder Provided pivotally supported by a connecting pin to a fixed member fixed to the inner part of the case, the drive cylinder and weir support arm is characterized in that a scum dams driving device capable arc movement in a vertical plane Twin drum type continuous casting equipment. 請求項1記載の装置において、前記シールケースの開口に該開口を塞ぐ蛇腹式シール壁を設けたことを特徴とする双ドラム式連続鋳造装置。 2. The twin drum type continuous casting apparatus according to claim 1, wherein a bellows type sealing wall for closing the opening is provided in the opening of the seal case.
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US7398817B2 (en) * 2003-10-31 2008-07-15 Thyssenkrupp Acciai Speciali Terni S.P.A Apparatus for confining the impurities of a molten metal contained into a continuous casting mould
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JPH0324350U (en) * 1989-07-20 1991-03-13

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JPS6261349U (en) * 1985-09-30 1987-04-16
JPH0729184B2 (en) * 1989-12-27 1995-04-05 新日本製鐵株式会社 Continuous casting equipment for thin cast pieces
JPH0716771B2 (en) * 1990-10-23 1995-03-01 新日本製鐵株式会社 Continuous casting equipment for metal ribbon
JP3015981B2 (en) * 1992-02-13 2000-03-06 新日本製鐵株式会社 Continuous casting machine for thin slabs
JPH0716712A (en) * 1993-06-30 1995-01-20 Nippon Steel Corp Twin-roll type continuous casting machine
FR2727338A1 (en) * 1994-11-30 1996-05-31 Usinor Sacilor CONTINUOUS CASTING DEVICE BETWEEN INHERENT COVER CYLINDERS
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JPH11267797A (en) * 1998-03-18 1999-10-05 Mitsubishi Heavy Ind Ltd Drum type strip caster

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