JP4608832B2 - Continuous cutting material gas cutting device - Google Patents

Continuous cutting material gas cutting device Download PDF

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Publication number
JP4608832B2
JP4608832B2 JP2001271972A JP2001271972A JP4608832B2 JP 4608832 B2 JP4608832 B2 JP 4608832B2 JP 2001271972 A JP2001271972 A JP 2001271972A JP 2001271972 A JP2001271972 A JP 2001271972A JP 4608832 B2 JP4608832 B2 JP 4608832B2
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Japan
Prior art keywords
pressure
oxygen
gas
pipe
cutting
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JP2001271972A
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Japanese (ja)
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JP2003080355A (en
Inventor
一之 加藤
望 田村
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JFE Steel Corp
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JFE Steel Corp
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Description

【0001】
【発明の属する技術分野】
本発明は、連続鋳造材を高切断速度で切断することができる連続鋳造材のガス切断装置に関する。
【0002】
【従来の技術】
近年、連続鋳造工場内に配置された連続鋳造設備において、生産能力を増大するために、連続鋳造材の鋳造速度を速めることが行われるようになり、それにともなって連続鋳造材の切断速度も速められてきた。
図3に連続鋳造設備の一例を示す。
【0003】
なお、図3中左側は連続鋳造設備の上流側、図3中右側はその下流側であり、モールド12内で鋳造された連続鋳造材Sは、ピンチロール13によって引抜かれ、サポートロール14で回転支持され、引き続きテーブルロール15上を搬送されて矢印X方向に進行しつつ、ガス切断装置により所定の長さとなるように切断される。図3中ai は切断中の位置であり、ai+1 、ai+2 、ai+3 ・・・は各切断予定位置である。
【0004】
この連続鋳造設備では、連続鋳造材Sにおける次の切断予定位置ai+1 がガス切断区間Aの始点Tに来る前に、ガス切断区間A内で位置ai での切断が終了し、次いで、ガス切断機1が始点Tに戻り、その位置で待機し、連続鋳造材Sの次の切断予定位置ai+1 が始点Tに到達したときに、ガス切断用の酸素吹管(以下単に吹管と記す)を積載したガス切断機1が連続鋳造材Sの搬送速度に同期して走行するように構成されている。
【0005】
このような連続鋳造材のガス切断装置では、ガス切断機1に設けた吹管2からガス酸素炎を連続鋳造材Sに吹き付けつつ、吹管2を連続鋳造材Sの幅方向に沿って移動させて連続鋳造材Sを溶断するのが普通である。
連続鋳造設備においては、上記のガス切断区間A(すなわちガス切断機1の移動可能な範囲)はその最大長さが定まっているのが普通であるので、ガス切断区間Aを連続鋳造材が移動する時間内に連続鋳造材を切断を完了しなければならない。したがって、鋳造速度を速めると、それだけ吹管2を連続鋳造材の幅方向に移動させる速度も速める必要がある。
【0006】
しかし、吹管2の移動速度を不適当な速度にまで速めると、図4(a)に示すような切残し部分Dが連続鋳造材Sに生じて、連続鋳造材Sの切断が失敗することがある。図4(a)は、連続鋳造材Sの切断途中における切断面の模式図であり、また図4(b)は、連続鋳造材Sの切断終了時点における正常切断面の模式図である。Cは正常切断部、Fは未切断部である。
【0007】
ところで、吹管2には、図4(c)に示すように、吹き出し口が設けてあり、中央部の吹き出し口から吹き出す酸素の切断酸素圧力が切断速度に大きな影響を与えることが知られている。
従来の吹管2は、切断酸素圧力がゲージ圧で1.5MPa未満で作動するものであったので、連続鋳造材の最大切断速度が500mm/分未満、例えば、切断速度が400mm/分程度であり切断速度が不十分であった。従来の吹管2で切断酸素として用いる酸素は、酸素供給設備から機側接続部41Aまでの間に配設される酸素配管41および機側のホース41Bとからなる酸素供給ライン11により供給するのが一般的である。
【0008】
最近、連続鋳造材の切断速度を500mm/分以上としても、切残し部分Dが生じないように連続鋳造材を高速切断できる吹管が開発されて、実用に供されつつある。この高速切断用吹管は、切断酸素圧力が従来より高く、ゲージ圧で1.5〜4.0MPaで動作するものである。
【0009】
【発明が解決しようとする課題】
しかしながら、高速切断用吹管に圧力(以下「圧力」と言う時は特に断わらない限り大気圧を基準とした相対圧、すなわちゲージ圧を言うものとする。)が1.5MPa以上の高圧酸素を供給しようとした場合、既設の酸素供給ライン11は1.5MPa未満の圧力用の配管および機側のホースとからなるので1.5MPa以上の高圧酸素を通すことができず、また、連続鋳造工場内に供給される酸素はせいぜい1.5MPa程度が通常であった。酸素を1.5MPa以上に昇圧する圧縮機あるいは、液体酸素気化設備等の昇圧手段は、連続鋳造工場とは分離されている酸素供給設備に設置してあるために、1.5MPa以上の高圧酸素を酸素供給設備から連続鋳造工場に送るようにしたのでは、高圧配管が長くなり、圧力損失が大きくなって、高速切断のために必要とされる酸素量を確保するのに高圧配管径を大径化したり、昇圧手段の能力仕様を1クラス高くしなければならず、酸素供給ラインの建設コストが増大するという問題があった。
【0010】
また、ガス切断装置の高速切断用吹管で必要とされる酸素量は、例えば、連続鋳造材が鋼スラブの場合、圧力が1.5〜4MPaで高々500Nm3 /時間程度と少なく、そのうえ圧力が1.5〜4MPaの高圧酸素は、高速切断用に使用される以外、連続鋳造工場では用途がないので、効率よく供給したいという要求もあった。
【0011】
本発明の目的は、上記問題点を解消し、設備仕様を限界まで抑えると共に、高圧酸素を効率よく、かつ必要量だけ吹管に供給することができる酸素供給ラインを有する連続鋳造材のガス切断装置を提供することにある。
【0012】
【課題を解決するための手段】
本発明は、連続鋳造設備により、鋳造された連続鋳造材を酸素供給ラインから供給される酸素ガスによって溶断する連続鋳造材のガス切断装置において、ゲージ圧で1.5MPa以上の圧力の酸素によって連続鋳造材を溶断可能な吹管と、該吹管に供給される酸素をゲージ圧で1.5MPa以上の圧力に昇圧する昇圧手段とを備えると共に、前記ガス昇圧手段から前記吹管までの間がゲージ圧で1.5MPa以上の酸素を供給可能な高圧配管で接続されており、前記酸素供給ラインに前記ガス昇圧手段を迂回するバイパス通路が設けてあることを特徴とする。
【0013】
その際、本発明においては、前記高圧配管の長さが300m以内となる位置に前記ガス昇圧手段が配置されていることが好適である
【0014】
【発明の実施の形態】
図1を用いて、本発明に係る連続鋳造材のガス切断装置について説明する。
このガス切断装置は、連続鋳造設備により鋳造された連続鋳造材Sをガス切断するための1.5MPa以上の酸素圧力で作動する高速切断用吹管である吹管20を備えると共にこの吹管20に酸素を供給するため圧力が1.5MPa未満の低圧酸素を1.5MPa以上に昇圧可能なガス昇圧手段であるガス圧縮機5を備える。このガス圧縮機5の入側とガス供給設備3との間は、酸素配管4により直接または酸素配管41を介して接続されている。一方、ガス圧縮機5の出側と吹管20の間は、圧力1.5MPa以上の高圧配管6で接続されている。
【0015】
酸素配管41は、酸素配管4を途中で分岐した分岐管であり、酸素配管4には圧力が1.5MPa未満の低圧酸素が酸素供給設備3から供給される。高圧配管6は、ガス圧縮機5の出側からガス切断機1近くの機側接続部6Bの間に配設された固定配管と、機側接続部6Bと吹管20とをつなぐ、高圧用機側ホース6Aから成る。
【0016】
なお、酸素配管42は、切替弁7、8、9と合わせてガス圧縮機5をバイパスして低圧酸素を吹管20に供給可能なバイパス通路を構成している。このバイパス通路は、普通、ガス圧縮機5の保守時又はガス圧縮機5の故障時に使用される。すなわち、酸素配管42は、一端が酸素配管41に接続され、かつ他端が高圧配管6の途中に接続され、酸素配管41、高圧配管6に設けた切替弁7、8を閉、酸素配管42に設けた切替弁9を開とすることにより、ガス圧縮機5をバイパスして低圧酸素を吹管20に供給する。この場合、吹管20に供給される酸素は、1.5MPa未満の酸素であるから、低速切断となる。酸素供給ライン21にガス圧縮機5をバイパスするバイパス通路が設けてある理由は、ガス圧縮機5の保守時又はガス圧縮機5の故障時に備えて、ガス圧縮機5を2台配置した酸素供給ラインとしたのでは、新設する酸素供給ラインの設備仕様を限界まで抑えることにならず、建設コストが高くなってしまい、一方、ガス圧縮機5を2台配置した酸素供給ラインとはせずに、バイパス通路も設けないのでは、ガス圧縮機5の保守時又はガス圧縮機5の故障時にオンラインで連続鋳造材の切断が行えなくなってしまうからである。
【0017】
このガス切断装置においては、通常、切替弁7、8を開、切替弁9を閉状態として、ガス圧縮機5により1.5MPa以上に昇圧された高圧酸素を吹管20に切断酸素として供給し、吹管20により、連続鋳造材の高速切断を行っている。
このように、本発明においては、ガス圧縮機5を新設する酸素供給ラインの途中に配置し、高圧配管6の長さを短くしたから、新設する酸素供給ライン21の設備仕様を限界まで抑えることができるのである。また本発明においては、既設の酸素配管4又は41から、1.5MPa未満の圧力の酸素を必要なだけ、ガス圧縮機5に送るようにしたので、高圧酸素を効率よく、かつ必要量だけ吹管20に供給することができる。
【0018】
ところで、本発明では、高圧配管6の長さが300mを超えるように、ガス圧縮機5を酸素供給ラインの途中に配置すると、図2に示すように、高圧配管6の径が1サイズ上の100Aとなってしまうので、高圧配管6の長さが300m以内となるようにガス圧縮機5を配置して、高圧配管6の径を90A以下とすることが好適である。この図2は、ガス圧縮機から吹管までの圧力損失を0.05MPa以下とするために必要な配管径とガス圧縮機から吹管までの配管長さの関係を示したグラフである。
【0019】
なお、酸素供給ラインの建設コストを高圧配管6の長さをパラメーターとして調べると、図2(b)に示すようになり、高圧配管6の長さが300mとなる位置にガス圧縮機5を配置した場合の建設コストは、高圧配管6の長さが2000mの場合の建設コストに比べて1/9になると試算される。
以上の説明ではガス昇圧手段としてガス圧縮機5を用いているが、本発明に用いるガス昇圧手段はガス圧縮機5に限定されず、酸素気化設備等のガス昇圧手段を用いることもできる。
【0020】
【実施例】
酸素供給ラインを有する連続鋳造材のガス切断装置において、図1に示すガス切断機1に1.5MPa以上の切断酸素圧力にて作動する吹管20を設け、かつ圧力が1.5MPaの酸素を2.0MPa以上に昇圧可能なガス圧縮機5を圧力が1.5MPaの酸素を供給する酸素供給設備3から吹管20に到る酸素供給ラインの途中に配置し、ガス圧縮機5の出側に高圧配管6を接続すると共に、ガス圧縮機5の入側に酸素を供給する酸素配管41を接続することにより、吹管20に1.5MPa以上に昇圧された高圧酸素を供給可能にした。
【0021】
その際、ガス圧縮機5の配置位置は、連続鋳造工場外とし、高圧配管用炭素鋼鋼管である高圧配管6の長さを150mとしたから、高圧配管6の配管径は40Aとすることができ、また、高圧配管6の長さが300mを超えた場合に必要な仕様より1クラス下の仕様のガス圧縮機5とすることができた。1クラス下の仕様のガス圧縮機5は、3.0MPa昇圧可能で、かつ圧力が4.0MPaでの流量が400Nm3 /時間である。
【0022】
このガス切断装置により、鋼スラブの切断速度を500〜600mm/分とするのに必要な高圧酸素を吹管20に供給することができ、上記実施例での酸素供給ラインの建設コストは、酸素供給設備3からガス切断の機側接続部6Bに到る高圧配管6を設けるようにした場合の建設コストに対して1/10である。
【0023】
なお、酸素供給ラインにガス圧縮機5をバイパスするバイパス通路を設けてあるため、連続鋳造材の切断速度を400mm/分以下として、定修期間を利用してガス圧縮機5のメンテナンスを3〜5日/年行うことができ、ロスタイムが発生することもなかった。
【0024】
【発明の効果】
本発明によれば、酸素供給ラインの設備仕様を限界まで抑えることができると共に、高圧酸素を効率よく、かつ必要量吹管に供給することができる。
その結果、連続鋳造材の切断装置において、酸素供給ラインの建設コストを低減したうえ、連続鋳造材を高速切断することがきるという効果を奏する。
【図面の簡単な説明】
【図1】本発明に係る連続鋳造材のガス切断装置の構成図である。
【図2】(a)は本発明に用いる高圧配管長さと高圧配管径の関係を示すグラフであり、(b)は高圧配管長さと酸素供給ラインの建設コスト比率の関係を示すグラフである。
【図3】本発明を適用した連続鋳造設備の配置図である。
【図4】(a)、(b)は吹管によるガス切断状況を示す概略図であり、(c)は吹管口の一例を示す部分断面図である。
【符号の説明】
S 連続鋳造材
100 連続鋳造材のガス切断装置
1 ガス切断機
10 連続鋳造工場
11 酸素供給ライン
2、20 吹管
3 酸素供給設備
4、41、42 酸素配管
5 ガス圧縮機(ガス昇圧手段)
6 高圧配管
4A、6A 接続部
4B、6B 機側ホース
7、8、9 切替弁
12 モールド
13 ピンチロール
14 サポートロール
15 テーブルロール
A ガス切断区間
T 始点
X 搬送方向
B 幅
i+1 、ai+2 、ai+3 ・・・切断予定位置
i 切断中の位置
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a continuous cutting material gas cutting device capable of cutting a continuous casting material at a high cutting speed.
[0002]
[Prior art]
In recent years, in order to increase the production capacity of continuous casting equipment installed in a continuous casting factory, the casting speed of the continuous casting material has been increased, and the cutting speed of the continuous casting material has been increased accordingly. Has been.
FIG. 3 shows an example of continuous casting equipment.
[0003]
The left side in FIG. 3 is the upstream side of the continuous casting equipment, and the right side in FIG. 3 is the downstream side. The continuous cast material S cast in the mold 12 is drawn by the pinch roll 13 and rotated by the support roll 14. While being supported, and continuously conveyed on the table roll 15 and proceeding in the direction of arrow X, it is cut to a predetermined length by the gas cutting device. In FIG. 3, a i is a cutting position, and a i + 1 , a i + 2 , a i + 3 .
[0004]
In the continuous casting facilities, before the next cut position a i + 1 in the continuous casting material S comes to the starting point T of gas cutting section A, completed cleavage at position a i in the gas cutting section A, then When the gas cutting machine 1 returns to the starting point T and waits at that position and the next scheduled cutting position a i + 1 of the continuous cast material S reaches the starting point T, an oxygen blowing pipe for gas cutting (hereinafter simply referred to as a blowing pipe). The gas cutting machine 1 loaded with the above is configured to run in synchronization with the conveying speed of the continuous cast material S.
[0005]
In such a continuous cutting material gas cutting device, the blowing tube 2 is moved along the width direction of the continuous casting material S while blowing a gas oxygen flame from the blowing tube 2 provided in the gas cutting machine 1 to the continuous casting material S. It is usual to blow the continuous casting material S.
In a continuous casting facility, the maximum length of the gas cutting section A (that is, the movable range of the gas cutting machine 1) is usually fixed, so that the continuous casting material moves in the gas cutting section A. The continuous cast material must be cut within the time to do so. Therefore, if the casting speed is increased, it is necessary to increase the speed at which the blow tube 2 is moved in the width direction of the continuous cast material.
[0006]
However, when the moving speed of the blow pipe 2 is increased to an inappropriate speed, a uncut portion D as shown in FIG. 4A is generated in the continuous cast material S, and the continuous cast material S may fail to be cut. is there. 4A is a schematic diagram of a cut surface in the middle of cutting the continuous cast material S, and FIG. 4B is a schematic diagram of a normal cut surface at the time when the continuous cast material S is cut. C is a normal cut part and F is an uncut part.
[0007]
By the way, as shown in FIG.4 (c), the blowing pipe 2 is provided with the blowing outlet, and it is known that the cutting | disconnection oxygen pressure of the oxygen which blows off from the blowing outlet of a center part will have big influence on a cutting speed. .
Since the conventional blow tube 2 operates at a cutting oxygen pressure of less than 1.5 MPa as a gauge pressure, the maximum cutting speed of the continuous cast material is less than 500 mm / min, for example, the cutting speed is about 400 mm / min. The cutting speed was insufficient. Oxygen used as cutting oxygen in the conventional blow pipe 2 is supplied through an oxygen supply line 11 including an oxygen pipe 41 and a machine-side hose 41B disposed between the oxygen supply facility and the machine-side connection 41A. It is common.
[0008]
Recently, a blow pipe capable of cutting a continuous cast material at a high speed so that the uncut portion D is not generated even when the cutting speed of the continuous cast material is set to 500 mm / min or more has been developed and is being put into practical use. This high-speed cutting blow tube has a higher cutting oxygen pressure than conventional ones and operates at a gauge pressure of 1.5 to 4.0 MPa.
[0009]
[Problems to be solved by the invention]
However, high-pressure oxygen with a pressure of 1.5 MPa or more is supplied to the high-speed cutting blow tube (hereinafter referred to as “pressure” unless otherwise specified, relative pressure based on atmospheric pressure, that is, gauge pressure). When trying to do so, the existing oxygen supply line 11 is composed of a pipe for pressure less than 1.5 MPa and a hose on the machine side, so high-pressure oxygen of 1.5 MPa or more cannot be passed, and in the continuous casting factory The oxygen supplied to was normally about 1.5 MPa at most. Since the pressurizing means such as a compressor for increasing the pressure of oxygen to 1.5 MPa or more or a liquid oxygen vaporization facility is installed in an oxygen supply facility separated from the continuous casting plant, a high-pressure oxygen of 1.5 MPa or more Is sent from the oxygen supply equipment to the continuous casting plant, the high-pressure piping becomes longer, the pressure loss becomes larger, and the diameter of the high-pressure piping is increased to ensure the amount of oxygen required for high-speed cutting. There has been a problem that the construction cost of the oxygen supply line is increased because the diameter or the capacity specification of the pressure increasing means must be increased by one class.
[0010]
Further, the amount of oxygen required for the high-speed cutting blow tube of the gas cutting device is, for example, as low as about 500 Nm 3 / hour at a pressure of 1.5 to 4 MPa and a pressure of 1.5 to 4 MPa when the continuous cast material is a steel slab. Since high pressure oxygen of 1.5 to 4 MPa has no application in a continuous casting factory other than being used for high-speed cutting, there is also a demand for supplying efficiently.
[0011]
The object of the present invention is to eliminate the above-mentioned problems, limit equipment specifications to the limit, and continuously cut the gas material of the continuous casting material having an oxygen supply line that can supply high-pressure oxygen to the blow pipe efficiently and only in a necessary amount. Is to provide.
[0012]
[Means for Solving the Problems]
The present invention relates to a continuous cutting material gas cutting device in which a continuous casting material cast by a continuous casting facility is melted by oxygen gas supplied from an oxygen supply line, and continuously with oxygen at a gauge pressure of 1.5 MPa or more. A blow pipe capable of fusing the cast material, and a pressure raising means for raising the oxygen supplied to the blow pipe to a pressure of 1.5 MPa or more by a gauge pressure, and a gap between the gas pressure raising means and the blow pipe is a gauge pressure. It is connected by a high-pressure pipe capable of supplying oxygen of 1.5 MPa or more, and a bypass passage for bypassing the gas pressure raising means is provided in the oxygen supply line .
[0013]
At that time, in the present invention, it is preferable that the length of the high-pressure pipe is arranged the gas boosting means to the position is within 300 meters.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
The continuous casting material gas cutting device according to the present invention will be described with reference to FIG.
This gas cutting device includes a blow pipe 20 that is a blow pipe for high-speed cutting that operates at an oxygen pressure of 1.5 MPa or more for gas cutting the continuous cast material S cast by the continuous casting equipment, and oxygen is supplied to the blow pipe 20. In order to supply, a gas compressor 5 which is a gas pressurizing means capable of boosting low pressure oxygen having a pressure of less than 1.5 MPa to 1.5 MPa or more is provided. The inlet side of the gas compressor 5 and the gas supply facility 3 are connected directly by an oxygen pipe 4 or through an oxygen pipe 41. On the other hand, the outlet side of the gas compressor 5 and the blow pipe 20 are connected by a high-pressure pipe 6 having a pressure of 1.5 MPa or more.
[0015]
The oxygen pipe 41 is a branch pipe branched from the oxygen pipe 4 in the middle, and low-pressure oxygen having a pressure of less than 1.5 MPa is supplied from the oxygen supply equipment 3 to the oxygen pipe 4. The high-pressure pipe 6 is a high-pressure machine that connects the fixed pipe disposed between the outlet side of the gas compressor 5 and the machine-side connecting part 6B near the gas cutting machine 1, the machine-side connecting part 6B, and the blowing pipe 20. It consists of a side hose 6A.
[0016]
The oxygen pipe 42 constitutes a bypass passage that can supply the low-pressure oxygen to the blowing pipe 20 by bypassing the gas compressor 5 together with the switching valves 7, 8, and 9. This bypass passage is normally used when the gas compressor 5 is maintained or when the gas compressor 5 is broken. That is, the oxygen pipe 42 has one end connected to the oxygen pipe 41, and the other end is connected to the middle of the high-pressure pipe 6, the oxygen pipe 41, the switching valves 7 and 8 provided in the high-pressure pipe 6 closed, oxygen pipe 42 By opening the switching valve 9 provided in the above, the gas compressor 5 is bypassed and low-pressure oxygen is supplied to the blowing pipe 20 . In this case, since the oxygen supplied to the blow tube 20 is oxygen of less than 1.5 MPa, the cutting is performed at a low speed. The reason why the oxygen supply line 21 has a bypass passage for bypassing the gas compressor 5 is that oxygen supply in which two gas compressors 5 are arranged in preparation for maintenance of the gas compressor 5 or when the gas compressor 5 fails. The line does not limit the specifications of the oxygen supply line to be newly installed, and the construction cost increases. On the other hand, the oxygen supply line does not have two gas compressors 5 arranged. If the bypass passage is not provided, the continuous cast material cannot be cut online during maintenance of the gas compressor 5 or when the gas compressor 5 fails.
[0017]
In this gas cutting device, normally, the switching valves 7 and 8 are opened, the switching valve 9 is closed, and high-pressure oxygen boosted to 1.5 MPa or more by the gas compressor 5 is supplied to the blowing pipe 20 as cutting oxygen. The blow pipe 20 is used to cut the continuous cast material at a high speed.
As described above, in the present invention, the gas compressor 5 is disposed in the middle of the oxygen supply line to be newly installed, and the length of the high-pressure pipe 6 is shortened. Can do it. In the present invention, since oxygen having a pressure of less than 1.5 MPa is sent from the existing oxygen pipe 4 or 41 to the gas compressor 5 as much as necessary, high-pressure oxygen is blown efficiently and in a necessary amount. 20 can be supplied.
[0018]
By the way, in this invention, when the gas compressor 5 is arrange | positioned in the middle of an oxygen supply line so that the length of the high voltage | pressure piping 6 may exceed 300 m, as shown in FIG. Therefore, it is preferable to arrange the gas compressor 5 so that the length of the high-pressure pipe 6 is within 300 m and to set the diameter of the high-pressure pipe 6 to 90 A or less. FIG. 2 is a graph showing the relationship between the pipe diameter required to reduce the pressure loss from the gas compressor to the blow pipe to 0.05 MPa or less and the pipe length from the gas compressor to the blow pipe.
[0019]
When the construction cost of the oxygen supply line is examined using the length of the high-pressure pipe 6 as a parameter, it becomes as shown in FIG. 2B, and the gas compressor 5 is arranged at a position where the length of the high-pressure pipe 6 is 300 m. In this case, the construction cost is estimated to be 1/9 compared to the construction cost when the length of the high-pressure pipe 6 is 2000 m.
In the above description, the gas compressor 5 is used as the gas booster. However, the gas booster used in the present invention is not limited to the gas compressor 5, and a gas booster such as an oxygen vaporization facility may be used.
[0020]
【Example】
In the continuous cutting material gas cutting apparatus having an oxygen supply line, the gas cutting machine 1 shown in FIG. 1 is provided with a blow pipe 20 that operates at a cutting oxygen pressure of 1.5 MPa or more, and oxygen of 2 MPa is supplied at a pressure of 1.5 MPa. The gas compressor 5 capable of increasing pressure to 0.0 MPa or more is disposed in the middle of the oxygen supply line from the oxygen supply facility 3 for supplying oxygen having a pressure of 1.5 MPa to the blow pipe 20, and a high pressure is provided on the outlet side of the gas compressor 5. By connecting the piping 6 and connecting the oxygen piping 41 for supplying oxygen to the inlet side of the gas compressor 5, it was possible to supply high pressure oxygen whose pressure was increased to 1.5 MPa or more to the blowing tube 20.
[0021]
At that time, the gas compressor 5 is disposed outside the continuous casting factory, and the length of the high-pressure pipe 6 that is a carbon steel pipe for high-pressure piping is 150 m. Therefore, the pipe diameter of the high-pressure pipe 6 is 40A. In addition, the gas compressor 5 having a specification that is one class lower than the specification required when the length of the high-pressure pipe 6 exceeds 300 m can be obtained. The gas compressor 5 having a specification of one class below can increase the pressure by 3.0 MPa, and the flow rate at a pressure of 4.0 MPa is 400 Nm 3 / hour.
[0022]
With this gas cutting device, high-pressure oxygen necessary for setting the cutting speed of the steel slab to 500 to 600 mm / min can be supplied to the blow tube 20, and the construction cost of the oxygen supply line in the above embodiment is the oxygen supply It is 1/10 of the construction cost when the high-pressure pipe 6 extending from the equipment 3 to the machine-side connecting part 6B for gas cutting is provided.
[0023]
In addition, since the bypass passage which bypasses the gas compressor 5 is provided in the oxygen supply line, the cutting speed of the continuous casting material is set to 400 mm / min or less, and maintenance of the gas compressor 5 is performed using a regular repair period. It was possible to carry out 5 days / year and there was no loss time.
[0024]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, while being able to hold down the equipment specification of an oxygen supply line to a limit, high pressure oxygen can be efficiently supplied to a required amount blowing pipe.
As a result, in the continuous casting material cutting device, the construction cost of the oxygen supply line can be reduced and the continuous casting material can be cut at a high speed.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a continuous casting material gas cutting device according to the present invention.
2A is a graph showing the relationship between the high-pressure pipe length and the high-pressure pipe diameter used in the present invention, and FIG. 2B is a graph showing the relationship between the high-pressure pipe length and the construction cost ratio of the oxygen supply line.
FIG. 3 is a layout view of continuous casting equipment to which the present invention is applied.
4A and 4B are schematic views showing a state of gas cutting by a blow pipe, and FIG. 4C is a partial cross-sectional view showing an example of a blow pipe opening.
[Explanation of symbols]
S Continuous Casting Material 100 Continuous Casting Material Gas Cutting Device 1 Gas Cutting Machine 10 Continuous Casting Factory 11 Oxygen Supply Line 2, 20 Blow Pipe 3 Oxygen Supply Equipment 4, 41, 42 Oxygen Pipe 5 Gas Compressor (Gas Booster)
6 High-pressure piping 4A, 6A Connection portion 4B, 6B Machine side hose 7, 8, 9 Switching valve 12 Mold 13 Pinch roll 14 Support roll 15 Table roll A Gas cutting section T Start point X Transport direction B Width a i + 1 , a i +2 , a i + 3 ... Planned cutting position a i Position during cutting

Claims (2)

連続鋳造設備により、鋳造された連続鋳造材を酸素供給ラインから供給される酸素ガスによって溶断する連続鋳造材のガス切断装置において、ゲージ圧で1.5MPa以上の圧力の酸素によって連続鋳造材を溶断可能な吹管と、該吹管に供給される酸素をゲージ圧で1.5MPa以上の圧力に昇圧するガス昇圧手段とを備えると共に、前記ガス昇圧手段から前記吹管までの間がゲージ圧で1.5MPa以上の酸素を供給可能な高圧配管で接続されており、前記酸素供給ラインに前記ガス昇圧手段を迂回するバイパス通路が設けてあることを特徴とする連続鋳造材のガス切断装置。In a continuous casting material gas cutting device that uses a continuous casting facility to cut the cast continuous casting material with oxygen gas supplied from the oxygen supply line, the continuous casting material is fused with oxygen at a gauge pressure of 1.5 MPa or more. And a gas pressure raising means for raising the oxygen supplied to the blow pipe to a pressure of 1.5 MPa or more by a gauge pressure, and a gap between the gas pressure raising means and the blow pipe is 1.5 MPa by a gauge pressure. A continuous cutting material gas cutting device characterized in that it is connected by a high-pressure pipe capable of supplying oxygen as described above, and a bypass passage that bypasses the gas pressure-increasing means is provided in the oxygen supply line . 前記高圧配管の長さが300m以内となる位置に前記ガス昇圧手段が配置されていることを特徴とする請求項1に記載の連続鋳造材のガス切断装置。 The gas cutting device for a continuous cast material according to claim 1, wherein the gas pressure raising means is arranged at a position where the length of the high-pressure pipe is within 300 m.
JP2001271972A 2001-09-07 2001-09-07 Continuous cutting material gas cutting device Expired - Fee Related JP4608832B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104308138A (en) * 2014-11-14 2015-01-28 北京首钢自动化信息技术有限公司 Casting end-point control device and method thereof based on multiple fixed lengths and multiple strands

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Publication number Priority date Publication date Assignee Title
JP5071206B2 (en) * 2008-03-31 2012-11-14 Jfeスチール株式会社 Gas cutting method and gas cutting machine for continuous casting material
CN102632212B (en) * 2012-04-01 2014-06-25 陈寅明 Switching method of continuous casting and cutting energy media and device thereof

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JPS61509A (en) * 1984-06-13 1986-01-06 Kawasaki Steel Corp Method and apparatus for blowing gas into molten metal
JPH0634140U (en) * 1992-09-30 1994-05-06 川崎重工業株式会社 Starting device for gas fuel supply device
JPH105999A (en) * 1995-12-20 1998-01-13 Auto Ag Lateral cutting for gas torch cutting of hot and cold strand and continuous steel casting equipment having cutting device
JPH10132458A (en) * 1996-10-28 1998-05-22 Nippon Sanso Kk Method and equipment for producing oxygen gas

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JPS61509A (en) * 1984-06-13 1986-01-06 Kawasaki Steel Corp Method and apparatus for blowing gas into molten metal
JPH0634140U (en) * 1992-09-30 1994-05-06 川崎重工業株式会社 Starting device for gas fuel supply device
JPH105999A (en) * 1995-12-20 1998-01-13 Auto Ag Lateral cutting for gas torch cutting of hot and cold strand and continuous steel casting equipment having cutting device
JPH10132458A (en) * 1996-10-28 1998-05-22 Nippon Sanso Kk Method and equipment for producing oxygen gas

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104308138A (en) * 2014-11-14 2015-01-28 北京首钢自动化信息技术有限公司 Casting end-point control device and method thereof based on multiple fixed lengths and multiple strands
CN104308138B (en) * 2014-11-14 2016-06-29 北京首钢自动化信息技术有限公司 A kind of casting terminal point control devices and methods therefor based on many scales, many casting stream

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