JP3867310B2 - Removal door device for arc furnace for steel making - Google Patents

Removal door device for arc furnace for steel making Download PDF

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JP3867310B2
JP3867310B2 JP31376295A JP31376295A JP3867310B2 JP 3867310 B2 JP3867310 B2 JP 3867310B2 JP 31376295 A JP31376295 A JP 31376295A JP 31376295 A JP31376295 A JP 31376295A JP 3867310 B2 JP3867310 B2 JP 3867310B2
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door
water
removal
cooled
furnace
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JPH09133475A (en
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修 竹内
清 根橋
智章 深谷
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石川島播磨重工業株式会社
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Furnace Charging Or Discharging (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は製鋼用アーク炉の除滓口ドアの開閉不良及び全閉不良を防止するための製鋼用アーク炉の除滓口ドア装置に関するものである。
【０００２】
【従来の技術】
製鋼用アーク炉は、図３に一例を示す如く原料としてのスクラップを装入する炉体１に炉蓋２を開閉自在に配置し、該炉体１の底部に底部電極３を設置すると共に、炉頂となる炉蓋２の中心部を貫通させて上部電極４を配置し、炉体１内へ所要量のスクラップが装入されると、装入されたスクラップと上記上部電極４との間にアークを発生させて生じたアーク熱によりスクラップを溶解して溶鋼５を作るようにしてあり、更に、該溶鋼５を出鋼させるために、炉体１の側壁部（炉壁部）に外方へ突出するような出鋼口樋６を形成して該出鋼口樋６の先端部下方に出鋼口７を設けると共に、上記出鋼口樋６とは反対側の炉体１の側壁部に、スクラップを溶解させた際に生じたスラグ９を炉外へ排出するための除滓口８を設けた構成としてある。
【０００３】
又、上記した如き製鋼用アーク炉における除滓口８には、炉内にてスクラップを溶解しているときに上記除滓口８を閉塞しておくための除滓口ドア装置が備えてある。従来より用いられている製鋼用アーク炉の除滓口ドア装置は、図４（イ）（ロ）に示す如く、除滓口８の両側における炉体１の外面にそれぞれガイドレール１０を上下方向に設置し、除滓口８を閉塞するための除滓口ドア１１を該左右のガイドレール１０に沿って上下方向に移動自在に配置し、且つ該除滓口ドア１１を、固定側に支持されたエアシリンダ１２のロッド先端にチェーン１３を介して吊下げ支持させ、該チェーン１３をホイール１４に掛けて除滓口ドア１１を垂直に吊り下げ、更に、上記除滓口ドア１１を下降させて除滓口８を閉じた時に除滓口ドア１１を載せておくための受台１５を、除滓口８の下側位置における炉体１の外壁に固定した構成としてある。
【０００４】
上記において、炉体１内で作られた溶鋼５を出鋼させようとする場合は、その前にスラグを排出させるために、除滓口ドア装置のエアシリンダ１２を収縮作動させてチェーン１３を介し除滓口ドア１１を引き上げて除滓口８を必要量開いた後、炉体１を除滓口８側へ傾動させて溶鋼５の表面にあるスラグ９を除滓口８を通して炉外へ排出させるようにし、しかる後、炉体１を出鋼口樋６側へ傾動させて出鋼口７より溶鋼５を出鋼させるようにしている。
【０００５】
【発明が解決しようとする課題】
ところが、上記従来の製鋼用アーク炉の除滓口ドア装置の場合、炉体１の除滓口８の周縁部と除滓口ドア１１の内側面との間には隙間があり、ドア全閉時でもこの隙間から多量の空気が炉内に流入するおそれがあり、又、炉体１を傾動させて除滓口８よりスラグ９を排出させる際、スラグ９が除滓口８の周囲やガイドレール１０、等に付着して、これが原因で除滓口ドア１１の開閉不良が発生するおそれがあると共に、スラグ９が受台１５の上面に溜ることによって除滓口ドア８を閉じた時に除滓口ドア１１の下面と受台１５の上面との間に隙間が生じて全閉不良が起こり、該隙間から多量の空気が炉内へ流入して炉の熱効率の低下、炉内の局部的過冷却等を生じさせる、という問題がある。
【０００６】
そこで、本発明は、除滓口ドアと除滓口との間に隙間を生じさせることをなくすと共に、除滓口からスラグを排出した際にスラグが辺りに付着した場合でも除滓口ドアの開閉不良や全閉不良を防いで炉内の気密性を確保することができるような製鋼用アーク炉の除滓口ドア装置を提供しようとするものである。
【０００７】
【課題を解決するための手段】
本発明は、上記課題を解決するために、炉蓋に電極を配置し、炉体内に装入された原料と電極との間にアークを発生させて原料を溶解させ、生じたスラグを除滓口より排出させるようにしてある製鋼用アーク炉における上記炉体外壁の除滓口周縁部に、中空の水冷枠を固定し、該水冷枠の左右両側部にガイドレールを上下方向にそれぞれ設置し、且つ、水冷構造とした除滓口ドアを上記左右のガイドレールに沿って上下動自在に取り付け、該水冷式除滓口ドアの上面にドア開閉用アクチュエータを連結すると共に、該水冷式除滓口ドアの下面に横幅全体に亘るカッターを取り付け、更に、上記水冷式除滓口ドアの前面に接して該水冷式除滓口ドアを水冷枠に押し付けるようにする押付用アクチュエータを複数個所に配置してなる構成とする。
【０００８】
水冷式除滓口ドアを閉じているとき、押付用アクチュエータで押すことにより水冷枠との間に隙間を形成されることがない。ドア開閉用アクチュエータにより水冷式除滓口ドアを引き上げて除滓口を開き、炉体を傾動させて除滓口よりスラグを排出させようとする場合、水冷枠及び水冷式除滓口ドアに高温のスラグが接触しても水冷枠及び水冷式除滓口の温度はほとんど上昇しないので、これらの間の温度差を大きくすることによって水冷枠及び水冷式除滓口ドアにスラグが付着するのを抑制することができ、しかも、水冷式除滓口ドアが高温によって変形してしまうことも防止することができる。又、スラグの排出が終了して除滓口を閉塞しようとする場合、押付用アクチュエータにより水冷式除滓口ドアを水冷枠に押え付けるようにした状態で、ドア開閉用アクチュエータにより水冷式除滓口ドアを押し下げるようにすると、除滓口よりスラグを排出させた時に水冷枠の前面に少量のスラグが付着していたとしても、付着しているスラグを水冷式除滓口ドアが押し下げられるときに下面に取り付けたカッターにより切断したり剥離することができるので、水冷式除滓口ドアを水冷枠に密着させることができる。このとき、押付用アクチュエータの先端に押えローラを取り付けると、水冷式除滓口ドアの前面を転動できるので、動作を円滑に行うことができる。
【０００９】
又、水冷式除滓口ドアの下面に取り付けたカッターを傾斜刃とすると、傾斜刃では切断個所が点となってドア開閉用アクチュエータの押し下げ力を集中させることができるので、小さな力で大きな切断力を発生させることができる。
【００１０】
【発明の実施の形態】
以下、本発明の実施の形態を図面を参照して説明する。
【００１１】
図１（イ）（ロ）及び図２は本発明の製鋼用アーク炉の除滓口ドア装置の実施の一形態を示すもので、図３に示した場合と同様に構成されている製鋼用アーク炉において、上部炉体１の外側壁の除滓口８の周縁部に、該除滓口８を取り囲むように枠体とし且つ内部を中空とし冷却媒体としての冷却水を流すようにして冷却構造とした水冷枠１６を固定し、該水冷枠１６に冷却水配管１７を接続し、且つ上記水冷枠１６の左右両側部に一対のガイドレール１８を上下方向に配設する。一方、内部空間に冷却媒体としての冷却水を流すようにして水冷構造とし且つ冷却水配管２０を接続した中空の水冷式除滓口ドア１９を構成し、該水冷式除滓口ドア１９を上記ガイドレール１８に沿って上下に移動自在に配置し、且つ、該水冷式除滓口ドア１９を、固定の支持フレーム２１に下向きに支持させた左右のドア開閉用アクチュエータとしての油圧シリンダ２２の各ロッド先端に連結すると共に、該水冷式除滓口ドア１９の下面には横幅全体に亘るカッター２３を複数のボルト２４によって取り付けて、油圧シリンダ２２の伸縮作動により水冷式除滓口ドア１９とカッター２３が一体となって昇降させられるようにする。
【００１２】
更に、上記除滓口８の前方位置には、除滓口８よりスラグを排水させる際に邪魔にならないようにして支持フレーム２５を設けて、該支持フレーム２５に、上下左右合計４本の押付用アクチュエータとしての油圧シリンダ２６を、水冷式除滓口ドア１９の四隅を押圧できるような間隔として除滓口８の方向へ向け水平に固定すると共に、各油圧シリンダ２６のロッド先端に押えローラ２７を上下方向に回転するようにして取り付けてなる構成とする。
【００１３】
今、炉体１内へ装入された原料としてのスクラップをアークを用いて溶解させようとする場合は、予め、上記左右のドア開閉用アクチュエータとしての油圧シリンダ２２を伸長させることにより水冷式除滓口ドア１９をガイドレール１８に沿い下降させて除滓口８を閉塞させ、更に、上記４本の押付用アクチュエータとしての油圧シリンダ２６を伸長作動させて押えローラ２７を介し水冷式除滓口ドア１９を水冷枠１６に押し付けて密着させておくようにする。これにより炉内の気密性を確保して炉の燃焼効率を向上させることができる。
【００１４】
又、炉体１内でスクラップを溶解させた際に生じたスラグを除滓口８より排出させようとする場合は、上記冷却水配管１７及び２０を通して水冷枠１６の内部及び水冷式除滓口ドア１９の内部に冷却水を循環させるようにし、又、上記４本の押付用の油圧シリンダ２６を収縮作動させて押えローラ２７を水冷式除滓口ドア１９より離した状態にしてから上記左右の開閉用の油圧シリンダ２２を同時に収縮作動させて水冷式除滓口ドア１９を引き上げて除滓口８を開け、しかる後、炉体１を除滓口８側へ傾動させてスラグを自重により排出させるようにするが、この際、水冷枠１６及び水冷式除滓口ドア１９に冷却水を循環させるようにしたことによって１５００〜１６００℃の高温になっているスラグが接触しても水冷枠１６及び水冷式除滓口ドア１９の温度はほとんど上昇しないので、これらの間の温度差を大きくすることによって水冷枠１６及び水冷式除滓口ドア１９にスラグが付着するのを抑制することができ、しかも、水冷式除滓口ドア１９が高温のスラグに接したことによって変形してしまうことも防止できる。
【００１５】
次いで、スラグの排出が終了して除滓口８を閉塞しようとする場合、まず、上記４本の押付用の油圧シリンダ２６のうちの上側の２本を伸長作動させて水冷式除滓口ドア１９の下端部を水冷枠１６の前面上部に押し付けるようにした後、上記左右のドア開閉用の油圧シリンダ２２を同時に伸長作動させて水冷式除滓口ドア１９をガイドレール１８に沿って押し下げるようにし、該水冷式除滓口ドア１９の下端部が下側の押付用油圧シリンダ２６の高さまで下降したならば下側の２本の押付用の油圧シリンダ２６も伸長作動させ、水冷式除滓口ドア１９を４本の押付用油圧シリンダ２６により水冷枠１６に押え付けた状態として油圧シリンダ２２により引き続き押し下げるようにする。この際、４本の押付用の油圧シリンダ２６のロッド先端の押えローラ２７を介して水冷式除滓口ドア１９を水冷枠１６に押し付けるようにしてあることから、水冷式除滓口ドア１９が下降するのに伴って各押えローラ２７が回転して水冷式除滓口ドア１９をスムーズに押し下げることができ、しかも、水冷式除滓口ドア１９の下面にカッター２３が取り付けてあるので、仮に、除滓口８よりスラグを排出させた時に水冷枠１６の前面に少量のスラグが付着していたとしても、付着しているスラグは水冷式除滓口ドア１９が油圧シリンダ２２により押し下げられるときカッター２３により切断されたり剥離されることになるので、水冷式除滓口ドア１９を水冷枠１６に密着させた状態で下降させることができて炉内の気密性を確保することができる。
【００１６】
上記において、図２に示すように、水冷式除滓口ドア１９の下面に取り付けるカッター２３として傾斜角θをθ＝５°〜３０°とした傾斜刃を用いるようにすると、傾斜刃の場合には切断個所と点で接するようになって油圧シリンダ２２の押し下げ力を切断点に集中させることができるので、平行刃と比較して小さな押し下げ力で大きな剪断力を発生させることができ、更に、該カッター２３を水冷式除滓口ドア１９の下面にボルト２４によって取り付けられるようにしたことにより、多数回の使用により刃先が摩耗したり破損した時には容易に交換することができる。
【００１７】
なお、本発明は上記実施の形態のみに限定されるものではなく、たとえば、水冷式除滓口ドア１９の油圧シリンダ２２及び押付用の油圧シリンダ２６は、油圧式のものに代えてエアシリンダや電動ジャッキとすることもでき、要は、水冷式除滓口ドア１９を押し下げてカッター２３に剪断力を付与したり水冷式除滓口ドア１９を水冷枠１６に押し付けることができれば如何なるアクチュエータを用いるようにしてもよく、又、ＡＣ炉に対しても全く同様にして適用することができ、その他、要旨を逸脱しない範囲内において種々変更を加え得ることは勿論である。
【００１８】
【発明の効果】
以上述べた如く、本発明の製鋼用アーク炉の除滓口ドア装置によれば、製鋼用アーク炉の炉体外壁の除滓口の周縁部に水冷枠を固定し、該水冷枠の左右両側部に上下方向に設置したガイドレールに沿い水冷式除滓口ドアを移動自在に配置し、該水冷式除滓口ドアにドア開閉用アクチュエータの先端を連結すると共に下面にカッターを取り付け、且つ該水冷式除滓口ドアの前面に押付用アクチュエータの先端を当接させて水冷枠に押し付けるようにしてなる構成としてあるので、除滓口を除滓口ドアで閉塞したときに両者間に隙間を生じさせることがなく、操業中に外気が流入するおそれをなくすことができ、又、除滓口よりスラグを排出した際に水冷枠及び水冷式除滓口ドアとスラグとの温度差を大きくすることができて、水冷枠及び水冷式除滓口ドアにスラグが付着するのを抑制すると共に水冷式除滓口ドアの変形を防止することができ、更に、仮に水冷枠の前面にスラグが付着したとしても、水冷式除滓口ドアを押付用アクチュエータにより水冷枠に押し付けた状態でドア開閉用アクチュエータによりガイドレールに沿って押し下げるようにして下面に取り付けたカッターにて付着したスラグを切断したり剥離することができるようにしてあることから、水冷式除滓口ドアを水冷枠に密着させて炉内の気密性を確保することができて、炉内に空気が流入して炉の熱効率が低下してしまうことを防止することができ、又、水冷式除滓口ドアの下面に取り付けるカッターを傾斜刃とすると、切断個所が点となってドア開閉用アクチュエータの押し下げ力を切断点に集中させることができて小さな力で大きな剪断力を発生させることができる、という優れた効果を発揮する。
【図面の簡単な説明】
【図１】本発明の製鋼用アーク炉の除滓口ドア装置の実施の一形態を示すもので、（イ）は側面図、（ロ）は（イ）のＢ−Ｂ方向矢視図である。
【図２】カッターとして傾斜刃を用いた場合を示す拡大図である。
【図３】製鋼用アーク炉の一例を示す断面図である。
【図４】従来より用いられている製鋼用アーク炉の除滓口ドア装置を示すもので、（イ）は側面図、（ロ）は（イ）のＡ−Ａ方向矢視図である。
【符号の説明】
１ 炉体
２ 炉蓋
３ 底部電極
４ 上部電極
８ 除滓口
９ スラグ
１６ 水冷枠
１８ ガイドレール
１９ 水冷式除滓口ドア
２２ 油圧シリンダ（ドア開閉用アクチュエータ）
２３ カッター（傾斜刃）
２６ 油圧シリンダ（押付用アクチュエータ）
２７ 押えローラ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a removal door device for a steelmaking arc furnace for preventing opening and closing failure and full closure failure of a removal door of a steelmaking arc furnace.
[0002]
[Prior art]
As shown in FIG. 3, the steelmaking arc furnace is provided with a furnace lid 2 that can be freely opened and closed in a furnace body 1 in which scrap as raw material is charged, and a bottom electrode 3 is installed at the bottom of the furnace body 1. When the upper electrode 4 is disposed through the center of the furnace lid 2 that is the top of the furnace and a required amount of scrap is charged into the furnace body 1, the gap between the charged scrap and the upper electrode 4 The molten steel 5 is made by melting the scrap by arc heat generated by generating an arc in the furnace body. Further, in order to produce the molten steel 5, the side wall portion (furnace wall portion) of the furnace body 1 is externally attached. The steel outlet 7 is formed so as to protrude in the direction of the steel, and the steel outlet 7 is provided below the tip of the steel outlet 6, and the side wall of the furnace body 1 opposite to the steel outlet 6. The part is provided with a removal port 8 for discharging the slag 9 generated when melting the scrap to the outside of the furnace.
[0003]
Further, the removal port 8 in the arc furnace for steel making as described above is provided with a removal port door device for closing the removal port 8 when scrap is melted in the furnace. . As shown in FIGS. 4 (A) and 4 (B), a conventional steelmaking arc furnace removal door device used in the prior art has guide rails 10 on the outer surface of the furnace body 1 on both sides of the removal opening 8 in the vertical direction. The removal door 11 for closing the removal port 8 is disposed so as to be movable in the vertical direction along the left and right guide rails 10, and the removal door 11 is supported on the fixed side. The rod end of the air cylinder 12 is suspended and supported via a chain 13, the chain 13 is hung on a wheel 14 to suspend the removal port door 11 vertically, and the removal port door 11 is further lowered. The cradle 15 on which the removal port door 11 is placed when the removal port 8 is closed is fixed to the outer wall of the furnace body 1 at the lower position of the removal port 8.
[0004]
In the above, when the molten steel 5 made in the furnace body 1 is to be removed, the chain 13 is moved by contracting the air cylinder 12 of the removal port door device before discharging the slag. After removing the removal port door 11 and opening the removal port 8 by a necessary amount, the furnace body 1 is tilted to the removal port 8 side, and the slag 9 on the surface of the molten steel 5 passes through the removal port 8 to the outside of the furnace. After that, the furnace body 1 is tilted toward the steel outlet 6 and the molten steel 5 is discharged from the steel outlet 7.
[0005]
[Problems to be solved by the invention]
However, in the case of the conventional steelmaking arc furnace removal door apparatus described above, there is a gap between the peripheral edge of the removal opening 8 of the furnace body 1 and the inner side surface of the removal opening door 11, and the door is fully closed. Even when there is a risk that a large amount of air may flow into the furnace from this gap, and when the furnace body 1 is tilted and the slag 9 is discharged from the removal port 8, the slag 9 is around the removal port 8 and the guide. It may adhere to the rail 10 or the like and cause the opening / closing failure of the removal door 11 due to this, and is removed when the removal door 8 is closed by the slag 9 accumulating on the upper surface of the cradle 15. A gap is formed between the lower surface of the shed door 11 and the upper surface of the cradle 15 to cause a full closure failure, and a large amount of air flows into the furnace from the gap to reduce the thermal efficiency of the furnace. There is a problem of causing overcooling and the like.
[0006]
Therefore, the present invention eliminates the generation of a gap between the removal door and the removal port, and even when the slag adheres to the removal door when the slag is discharged from the removal port, It is an object of the present invention to provide a steel door opening device for an arc furnace for steel making which can prevent open / close failure and fully closed failure and ensure airtightness in the furnace.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention provides an electrode on the furnace lid, generates an arc between the raw material charged in the furnace body and the electrode, dissolves the raw material, and removes the generated slag. A hollow water-cooling frame is fixed to the periphery of the removal port of the outer wall of the furnace body in the steelmaking arc furnace to be discharged from the mouth, and guide rails are respectively installed in the vertical direction on the left and right sides of the water-cooling frame. And a removal door having a water cooling structure is attached to the left and right guide rails so as to be movable up and down, a door opening / closing actuator is connected to the upper surface of the water cooling removal door, and the water cooling removal A cutter that covers the entire width is attached to the lower surface of the mouth door, and there are several pressing actuators that touch the front of the water-cooled removal door and press the water-cooled removal door against the water-cooling frame. The configuration is as follows.
[0008]
When the water-cooled removal door is closed, a gap is not formed between the water-cooling frame and the water-cooling frame by pressing with the pressing actuator. When the water-cooled removal door is lifted by the door opening / closing actuator, the removal opening is opened, and the furnace body is tilted to discharge slag from the removal opening, the water cooling frame and the water-cooling removal door are hot. The temperature of the water-cooled frame and the water-cooled removal port will hardly increase even if the slag comes into contact with each other, so increasing the temperature difference between them will prevent the slag from adhering to the water-cooled frame and the water-cooled removal port. In addition, it is possible to prevent the water-cooled type door opening door from being deformed due to high temperature. Also, when the removal of slag is completed and the removal port is to be closed, the water cooling type removal device is opened by the door opening / closing actuator while the water cooling type removal port door is pressed against the water cooling frame by the pushing actuator. When the mouth door is pushed down, even if a small amount of slag is attached to the front of the water cooling frame when slag is discharged from the removal port, the water-cooled removal door can be pushed down. Since it can cut | disconnect or peel with the cutter attached to the lower surface, a water-cooling type removal door can be closely_contact | adhered to a water-cooling frame. At this time, if a presser roller is attached to the tip of the pressing actuator, the front surface of the water-cooled removal door can be rolled, so that the operation can be performed smoothly.
[0009]
In addition, if the cutter attached to the lower surface of the water-cooled removal door is an inclined blade, the inclined blade can concentrate the push-down force of the door opening and closing actuator at the cutting point, so a large cutting with a small force Can generate power.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0011]
FIGS. 1 (a), (b) and FIG. 2 show an embodiment of a removal door apparatus for a steel arc furnace according to the present invention, which is constructed similarly to the case shown in FIG. In the arc furnace, cooling is performed at the peripheral portion of the removal port 8 on the outer wall of the upper furnace body 1 so as to surround the removal port 8 and to have a hollow inside and to flow cooling water as a cooling medium. A water cooling frame 16 having a structure is fixed, a cooling water pipe 17 is connected to the water cooling frame 16, and a pair of guide rails 18 are vertically arranged on both left and right sides of the water cooling frame 16. On the other hand, a hollow water-cooled removal port door 19 having a water-cooling structure and having a cooling water pipe 20 connected thereto is constructed so that cooling water as a cooling medium flows in the internal space. Each of the hydraulic cylinders 22 as left and right door opening / closing actuators, which are arranged so as to be movable up and down along the guide rails 18 and the water-cooled removal door 19 is supported downward by a fixed support frame 21. A cutter 23 extending over the entire width is attached to the lower surface of the water-cooled removal door 19 with a plurality of bolts 24, and the water-cooled removal door 19 and the cutter are connected to each other by expansion and contraction of the hydraulic cylinder 22. 23 is moved up and down integrally.
[0012]
Further, a support frame 25 is provided at a position in front of the removal port 8 so as not to obstruct the drainage of the slag from the removal port 8, and a total of four pressings are applied to the support frame 25. The hydraulic cylinder 26 serving as an actuator for use is fixed horizontally toward the removal port 8 at intervals that allow the four corners of the water-cooled removal port door 19 to be pressed, and a press roller 27 is attached to the rod end of each hydraulic cylinder 26. Are configured to be attached so as to rotate in the vertical direction.
[0013]
Now, when the scrap as raw material charged into the furnace body 1 is to be melted by using an arc, the hydraulic cylinder 22 as the left and right door opening / closing actuators is extended in advance to remove the water-cooled type. The eaves door 19 is lowered along the guide rail 18 to close the eaves 8, and the hydraulic cylinders 26 as the four pressing actuators are extended to operate the water-cooled egress through the press rollers 27. The door 19 is pressed against the water cooling frame 16 so as to be in close contact therewith. Thereby, the airtightness in a furnace can be ensured and the combustion efficiency of a furnace can be improved.
[0014]
When slag generated when scrap is melted in the furnace body 1 is to be discharged from the removal port 8, the inside of the water cooling frame 16 and the water cooling type removal port through the cooling water pipes 17 and 20. The cooling water is circulated inside the door 19, and the four pressing hydraulic cylinders 26 are contracted so that the presser roller 27 is separated from the water-cooled removal door 19, and then the left and right The hydraulic cylinder 22 for opening and closing the cylinder is simultaneously contracted to lift the water-cooled removal port door 19 to open the removal port 8, and then the furnace body 1 is tilted to the removal port 8 side so that the slag is caused by its own weight. Although it is made to discharge | emit, even if the slag which is 1500-1600 degreeC high temperature by having made it circulate through the water cooling frame 16 and the water cooling type removal port door 19 in this case, a water cooling frame 16 and water cooling Since the temperature of the door 19 hardly rises, it is possible to suppress the slag from adhering to the water cooling frame 16 and the water cooling type removal port door 19 by increasing the temperature difference between them. It can also be prevented that the door 19 is deformed due to contact with the hot slag.
[0015]
Next, when the discharge of the slag is finished and the removal port 8 is to be closed, first, the upper two of the four pressing hydraulic cylinders 26 are extended to operate the water-cooled removal port. After the lower end of 19 is pressed against the upper front of the water cooling frame 16, the hydraulic cylinders 22 for opening and closing the left and right doors are simultaneously extended to push down the water cooling type removal port door 19 along the guide rail 18. When the lower end of the water-cooled removal door 19 is lowered to the height of the lower pressing hydraulic cylinder 26, the two lower pressing hydraulic cylinders 26 are also extended to operate the water-cooling removal. The mouth door 19 is pressed against the water cooling frame 16 by the four pressing hydraulic cylinders 26 and is continuously pressed down by the hydraulic cylinder 22. At this time, since the water-cooled removal door 19 is pressed against the water-cooling frame 16 via the presser roller 27 at the tip of the rods of the four pressing hydraulic cylinders 26, the water-cooled removal door 19 is Each presser roller 27 rotates as it descends, so that the water-cooled removal door 19 can be pushed down smoothly, and the cutter 23 is attached to the lower surface of the water-cooled removal door 19. Even when a small amount of slag is attached to the front surface of the water cooling frame 16 when the slag is discharged from the removal port 8, the adhered slag is pushed down when the water cooling type removal port door 19 is pushed down by the hydraulic cylinder 22. Since it will be cut or peeled off by the cutter 23, the water-cooled removal port door 19 can be lowered while being in close contact with the water-cooling frame 16, thereby ensuring airtightness in the furnace. That.
[0016]
In the above case, as shown in FIG. 2, when an inclined blade having an inclination angle θ of θ = 5 ° to 30 ° is used as the cutter 23 attached to the lower surface of the water-cooled removal door 19, Can be brought into contact with the cutting point at a point so that the pressing force of the hydraulic cylinder 22 can be concentrated at the cutting point, so that a large shearing force can be generated with a small pressing force compared to the parallel blade, Since the cutter 23 is attached to the lower surface of the water-cooled removal port door 19 with the bolt 24, it can be easily replaced when the cutting edge is worn or damaged by many uses.
[0017]
The present invention is not limited to the above-described embodiment. For example, the hydraulic cylinder 22 and the pressing hydraulic cylinder 26 of the water-cooled removal door 19 are replaced with hydraulic cylinders, An electric jack can also be used. In short, any actuator can be used as long as the water-cooled removal port door 19 is pushed down to apply shearing force to the cutter 23 or the water-cooled removal port door 19 can be pressed against the water-cooling frame 16. Of course, the present invention can be applied to an AC furnace in the same manner, and various modifications can be made without departing from the scope of the invention.
[0018]
【The invention's effect】
As described above, according to the steelmaking arc furnace removal port door apparatus of the present invention, the water cooling frame is fixed to the peripheral edge of the removal port of the furnace body outer wall of the steelmaking arc furnace, and both left and right sides of the water cooling frame A water-cooled removal door is movably arranged along a guide rail installed in the vertical direction at the section, and the tip of the door opening / closing actuator is connected to the water-cooled removal door and a cutter is attached to the lower surface, and Since the front end of the water cooling type removal door is in contact with the tip of the pressing actuator and pressed against the water cooling frame, there is a gap between the two when the removal port is closed by the removal door. This eliminates the possibility of outside air flowing in during operation, and increases the temperature difference between the water cooling frame and the water cooling type door and the slag when slag is discharged from the port. Water cooling frame and water cooling type It is possible to prevent slag from adhering to the door and to prevent deformation of the water-cooled door, and even if slag adheres to the front of the water-cooled frame, the water-cooled door Because the slag attached to the lower surface can be cut or peeled off by being pushed down along the guide rail by the door opening / closing actuator while pressed against the water cooling frame by the pressing actuator. The water-cooled door is closely attached to the water-cooling frame to ensure the airtightness in the furnace, and it is possible to prevent the flow of air into the furnace and decrease the thermal efficiency of the furnace. Also, if the cutter attached to the lower surface of the water-cooled removal door is an inclined blade, the pressing point of the door opening / closing actuator can be concentrated at the cutting point. It is possible to generate a large shearing force with a small force comes, there is exhibited an excellent effect that.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 shows an embodiment of a steel door removing apparatus for a steelmaking arc furnace according to the present invention, in which (A) is a side view and (B) is a view taken in the direction of arrows BB in (A). is there.
FIG. 2 is an enlarged view showing a case where an inclined blade is used as a cutter.
FIG. 3 is a cross-sectional view showing an example of a steelmaking arc furnace.
FIGS. 4A and 4B show a conventional door opening device for a steelmaking arc furnace, where FIG. 4A is a side view and FIG. 4B is a view taken along the direction AA in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Furnace 2 Furnace lid 3 Bottom electrode 4 Upper electrode 8 Removal port 9 Slag 16 Water cooling frame 18 Guide rail 19 Water cooling type removal door 22 Hydraulic cylinder (actuator for door opening and closing)
23 Cutter (Inclined blade)
26 Hydraulic cylinder (pressing actuator)
27 Presser roller

Claims (3)

炉蓋に電極を配置し、炉体内に装入された原料と電極との間にアークを発生させて原料を溶解させ、生じたスラグを除滓口より排出させるようにしてある製鋼用アーク炉における上記炉体外壁の除滓口周縁部に、中空の水冷枠を固定し、該水冷枠の左右両側部にガイドレールを上下方向にそれぞれ設置し、且つ、水冷構造とした除滓口ドアを上記左右のガイドレールに沿って上下動自在に取り付け、該水冷式除滓口ドアの上面にドア開閉用アクチュエータを連結すると共に、該水冷式除滓口ドアの下面に横幅全体に亘るカッターを取り付け、更に、上記水冷式除滓口ドアの前面に接して該水冷式除滓口ドアを水冷枠に押し付けるようにする押付用アクチュエータを複数個所に配置してなることを特徴とする製鋼用アーク炉の除滓口ドア装置。An arc furnace for steel making, in which an electrode is placed on the furnace lid, an arc is generated between the raw material charged in the furnace and the electrode to melt the raw material, and the generated slag is discharged from the removal port A hollow water cooling frame is fixed to the periphery of the removal port of the outer wall of the furnace body, and guide rails are vertically installed on both left and right sides of the water cooling frame, respectively, and a removal port door having a water cooling structure is provided. Attached to the above left and right guide rails so that it can move up and down, the door opening / closing actuator is connected to the upper surface of the water-cooled removal door, and a cutter is attached to the lower surface of the water-cooled removal door. Further, an arc furnace for steel making, wherein a pressing actuator is provided at a plurality of positions so as to contact the front surface of the water-cooled removal port door and press the water-cooled removal port door against the water-cooling frame. Door opening device. 水冷式除滓口ドアの下面に取り付けるカッターを傾斜刃とした請求項１記載の製鋼用アーク炉の除滓口ドア装置。2. A steel door removing apparatus for an arc furnace for steel making according to claim 1, wherein the cutter attached to the lower surface of the water-cooled steel door is an inclined blade. 押付用アクチュエータを、水冷式除滓口ドアの前面に接して転動するよう押えローラを先端に備えた構成とした請求項１記載の製鋼用アーク炉の除滓口ドア装置。2. The steel door removing door device for an arc furnace for steel making according to claim 1, wherein a pressing roller is provided at the tip so that the pressing actuator rolls in contact with the front surface of the water-cooled water removing door.
JP31376295A 1995-11-08 1995-11-08 Removal door device for arc furnace for steel making Expired - Fee Related JP3867310B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP31376295A JP3867310B2 (en) 1995-11-08 1995-11-08 Removal door device for arc furnace for steel making

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP31376295A JP3867310B2 (en) 1995-11-08 1995-11-08 Removal door device for arc furnace for steel making

Publications (2)

Publication Number Publication Date
JPH09133475A JPH09133475A (en) 1997-05-20
JP3867310B2 true JP3867310B2 (en) 2007-01-10

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