JPH035067A - Apparatus for preventing flowing-out of slag in ladle and controlling method thereof - Google Patents
Apparatus for preventing flowing-out of slag in ladle and controlling method thereofInfo
- Publication number
- JPH035067A JPH035067A JP13620689A JP13620689A JPH035067A JP H035067 A JPH035067 A JP H035067A JP 13620689 A JP13620689 A JP 13620689A JP 13620689 A JP13620689 A JP 13620689A JP H035067 A JPH035067 A JP H035067A
- Authority
- JP
- Japan
- Prior art keywords
- rod
- molten steel
- shaped object
- slag
- ladle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000002893 slag Substances 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 22
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 58
- 239000010959 steel Substances 0.000 claims abstract description 58
- 239000002184 metal Substances 0.000 claims description 13
- 238000010079 rubber tapping Methods 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 230000005484 gravity Effects 0.000 claims description 5
- 230000002265 prevention Effects 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 239000000725 suspension Substances 0.000 claims description 2
- 230000000903 blocking effect Effects 0.000 claims 1
- 238000007599 discharging Methods 0.000 abstract 3
- 230000001174 ascending effect Effects 0.000 abstract 2
- 238000005259 measurement Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- GNFTZDOKVXKIBK-UHFFFAOYSA-N 3-(2-methoxyethoxy)benzohydrazide Chemical compound COCCOC1=CC=CC(C(=O)NN)=C1 GNFTZDOKVXKIBK-UHFFFAOYSA-N 0.000 description 1
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000009848 ladle injection Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は溶鋼を満たした取鍋の下方から溶鋼を取り出す
際に、溶鋼と共にスラグが流出することを防止するため
の取鍋内スラグ流出防止装置と、その制御方法に関する
。[Detailed Description of the Invention] [Field of Industrial Application] The present invention is a method for preventing slag from flowing out in a ladle to prevent slag from flowing out together with molten steel when molten steel is taken out from below a ladle filled with molten steel. It relates to a device and its control method.
し従来の技術」
周知の如く製鋼工程においては、精錬された取鍋内の溶
鋼をその底部に設けられている出湯孔からスライディン
グノズルを開いて連続鋳造のタンデイツシュ内へ注入し
、タンデイツシュから鋳型へ注入して鋳片が製造されて
いる。上記の取鍋からの溶鋼の注入作業に於いて清浄鋼
を製造する上で重要なことは、取鍋内溶鋼上に浮上して
いるスラグの流出を防止することであり、従来からスラ
グ流出防止に多大の努力が払われている所である。As is well known, in the steelmaking process, the refined molten steel in the ladle is poured into the continuous casting tundish by opening a sliding nozzle from the tapping hole provided at the bottom of the ladle, and from the tundish into the mold. Slabs are produced by injection. In the process of pouring molten steel from the ladle mentioned above, what is important in producing clean steel is to prevent the slag floating on top of the molten steel in the ladle from flowing out. This is where a great deal of effort is being made.
取鍋からクンデイツシュへ溶鋼を注入するさいのスラグ
の流出は(1)取鍋内の溶鋼レベル低下に伴ない取鍋出
湯孔の直上で発生する渦流への浮上スラグ層の巻込み、
及び(2)取鍋注入終了判定遅れによる浮上スラグ層の
流出に大別することができる。而して上記(1)、
(2)によるスラグ流出を防止する方法として、既に特
開昭60−210352号公報によるスラグ流出防止方
法が提案されている。The outflow of slag during pouring of molten steel from the ladle to the kunditshu is caused by (1) entrainment of the floating slag layer in the vortex generated directly above the ladle tap hole as the molten steel level in the ladle decreases;
and (2) outflow of the floating slag layer due to a delay in determining the end of ladle injection. Therefore, (1) above,
As a method for preventing slag outflow due to (2), a method for preventing slag outflow has already been proposed in Japanese Patent Laid-Open No. 60-210352.
この方法は、フローティングバルブ方式と称さnるもの
で、上ヒ重に周整されたフローティングバルブを取鍋内
の溶鋼レベルが低下して渦流が発生する時期になると、
出湯孔直上のスラグ−溶鋼界面部に位置させて渦流の発
生を防止してスラグの巻込みを防ぎ、注入終了時にフロ
ーティングバルブを出湯孔へ着地して出湯孔を閉塞し浮
上スラグの流出を防止しようというものである。This method is called the floating valve method, and when the molten steel level in the ladle drops and a vortex is generated, the floating valve is tightly arranged on the top.
The floating valve is placed at the slag-molten steel interface directly above the tap hole to prevent the generation of vortices and slag entrainment, and at the end of injection, the floating valve lands on the tap hole to block the tap hole and prevent floating slag from flowing out. This is what we are trying to do.
この技術によれば、渦流の発生が効果的に防止できてス
ラグの巻込みを有効に防ぐことができるものであるが、
注入終了時のスラグ流出防止に対(3)
(4)
する効果は十分なものではない。即ち、取鍋出湯孔近傍
の耐火物及びフローティングバルブを構成する耐火物が
溶損して形状が変化した場合には、出湯孔の閉塞を確実
に行なうことができず注入終了時にスラグの流出が起る
ケースがしばしばある。According to this technology, the generation of vortices can be effectively prevented and the entrainment of slag can be effectively prevented.
(3) (4) The effect of preventing slag outflow at the end of injection is not sufficient. In other words, if the refractories near the ladle tap hole and the refractories constituting the floating valve are eroded and their shapes change, the tap hole cannot be reliably blocked and slag will flow out at the end of pouring. There are often cases where
特開昭62−203667号公報には、これを解決する
ものとして、フロートをスラグ層と溶鋼との界面部に位
置させた状態で湯面降下に追従させて下降させ、所定の
高さまで下降した時点で下降を停止させ、その後のフロ
ートの浮力変化をフロートの張力の変化して検出し、そ
れに基いて取鍋の出湯孔を閉塞するという方法が開示さ
れている。To solve this problem, JP-A No. 62-203667 discloses a method in which a float is placed at the interface between the slag layer and molten steel and lowered to follow the drop in the molten metal level to a predetermined height. A method is disclosed in which the descent is stopped at a certain point in time, the subsequent change in the buoyancy of the float is detected as a change in the tension of the float, and the tapping hole of the ladle is closed based on the change in the float's tension.
この方法では、所定の高さに保持したフロートにかかる
張力の変化のみに基いて出湯孔の閉塞のタイミングを得
ている。したがって出湯孔近傍の耐火物が溶損して形状
が変化すると出湯孔上部と検出個所との位置関係が変化
し溶鋼の流れの状態が変化して、タイミングのずれを生
じることがある。また、溶鋼の熱対流の状態によっても
あるいは出湯孔の開度によっても溶鋼の流れの状態が変
化して張力の測定値にバラツキを生じて急変の判定が困
難となり、結果的に閉塞の時期を誤ることがある。In this method, the timing of closing the tapping hole is determined based solely on changes in the tension applied to the float held at a predetermined height. Therefore, when the refractory near the tap hole changes its shape due to melting damage, the positional relationship between the top of the tap hole and the detection location changes, changing the state of the flow of molten steel and causing a timing shift. In addition, the state of the flow of molten steel changes depending on the state of thermal convection of the molten steel or the opening degree of the tapping hole, causing variations in the measured tension values, making it difficult to judge the sudden change, and as a result, the time of blockage can be determined. Sometimes I make mistakes.
したがって本発明の目的は上記の点を改良したスラグ流
出防止装置およびその制御方法を提案することにある。SUMMARY OF THE INVENTION Therefore, an object of the present invention is to propose a slag outflow prevention device and a control method thereof that improve the above-mentioned points.
本発明に係る取鍋内スラグ流出防止蒙置は底部に出湯孔
を有し該出湯孔からの溶鋼流出量を調節する流出量調節
手段を有する取鍋からのスラグの流出を防止するための
装置であって、溶鋼に渦流が発生する溶鋼レベル以上の
鉛直方向の長さを有し、底部に該出湯孔上部と係合する
形状を有し、溶鋼の比重よりも大である比重を有する棒
状物体と、該棒状物体を昇降させる昇降手段と、該棒状
物体の鉛直方向の位置を計測する位置計測手段と、該棒
状物体の釣支力を計測する釣支力計測手段とを具備する
ことを特徴とするものである。The slag outflow prevention device in a ladle according to the present invention is a device for preventing slag from flowing out of a ladle, which has a tapping hole at the bottom and has an outflow amount adjusting means for adjusting the amount of molten steel flowing out from the tapping hole. A rod-shaped rod having a length in the vertical direction equal to or higher than the molten steel level at which a vortex is generated in the molten steel, a bottom portion having a shape that engages with the upper part of the tapping hole, and a specific gravity that is greater than the specific gravity of the molten steel. The present invention includes an object, a lifting means for raising and lowering the rod-like object, a position measuring means for measuring the vertical position of the rod-like object, and a fishing force measuring means for measuring the fishing force of the rod-like object. This is a characteristic feature.
また、本発明に係る方法は前述の装置を制御する方法で
あって、
l)該棒状物体が湯面上方に保持されたときに該棒状物
体が予熱されて溶鋼へ突入した時にスラグ、溶鋼等の付
着が防止されるに充分な高さまで湯面レベルが低下した
後、該棒状物体を下降させて湯面上方に保持し、
11)溶鋼へ突入した時にスラグ溶鋼等の付着が防止さ
れるに充分な時間が経過し、
111)湯面レベルが該棒状物体の鉛直方向の長さ程度
に低下後、該棒状物体の下降を開始し、iv)該棒状物
体の釣支力が該棒状物体の重量から溶鋼の浮力を差し引
いた値以下になった後、該棒状物体が出湯孔上部に達し
たものとして下降を停止して所定の高さだけ上昇して保
持し、■)該棒状物体の重量が急変したとき、湯面下降
速度に同調してもしくはそれ以上の速度で該棒状物体を
下降させ、
vi)該棒状物体が出湯孔上部に達して後、該流出量調
節手段により出湯孔を閉塞することを特徴とするもので
ある。In addition, the method according to the present invention is a method for controlling the above-mentioned device, and includes the following steps: l) When the rod-shaped object is held above the molten metal surface and the rod-shaped object is preheated and plunges into molten steel, slag, molten steel, etc. 11) After the molten metal level has fallen to a height sufficient to prevent the adhesion of molten steel, the rod-shaped object is lowered and held above the molten metal surface, and After a sufficient period of time has elapsed, 111) the hot water level has decreased to about the length of the rod-shaped object in the vertical direction, the rod-shaped object begins to descend, and iv) the hanging force of the rod-shaped object has increased. After the weight becomes less than the value obtained by subtracting the buoyancy of the molten steel from the weight, it is assumed that the rod-shaped object has reached the upper part of the tapping hole, and the descent is stopped and the object is raised to a predetermined height and held; vi) when the rod-shaped object reaches the upper part of the tap hole, the outflow rate adjusting means closes the tap hole; It is characterized by:
iv)のステップで棒状物体が流出口上部に達したとき
の位置がわかり、その位置から所定の高さまで上昇する
ことによって、出湯孔を閉塞するタイミングを得るため
の棒状物体の位置と流出口上部との位置関係は、溶損の
状況にかかわらず常に一定に保たれる。In step iv), the position of the rod-shaped object when it reaches the upper part of the outlet is known, and by rising from that position to a predetermined height, the position of the rod-shaped object and the upper part of the outlet are determined in order to obtain the timing to block the tap hole. The positional relationship between the two is always kept constant regardless of the state of erosion.
また、スライプインクノズル閉のタイミンクは釣支力の
変化によりおこなわれるが、棒状物体に地金又はスラグ
が付着していると、外乱の原因となり影響を受けるので
11)のステップで予熱により溶鋼へ突入した時の付着
が防止されるようにしている。又、予熱不足で付着物が
棒状物体に付着した場合でもこの予熱により付着物が充
分溶融除去される。In addition, the timing of closing the slip ink nozzle is determined by changes in the suspension force, but if bare metal or slag adheres to the rod-shaped object, it will cause disturbance and be affected, so in step 11) the molten steel is preheated. It is designed to prevent adhesion when entering the area. Further, even if deposits adhere to the rod-shaped object due to insufficient preheating, the deposits can be sufficiently melted and removed by this preheating.
溶損の状況を検知するために、本発明にふける棒状物体
は、溶鋼より充分重い金属とそれを覆う(7)
(8)
耐火物により構成されており、トータルとしての比重は
溶鋼のそれよりも大に設定されている。そのため棒状物
体は溶鋼表面近くに浮くことはない。In order to detect the situation of melting loss, the rod-shaped object according to the present invention is composed of a metal that is sufficiently heavier than molten steel and a refractory covering it (7) (8), and its total specific gravity is higher than that of molten steel. is also set to large. Therefore, the rod-shaped object does not float near the surface of the molten steel.
しかもその長さが渦流の発生するレベルよりも長く設計
されており、湯面レベルがその長さ以下になったときに
111)のステップで溶鋼中に沈められるので常にその
一部が溶鋼面から出ており、渦流の発生が防止される。Moreover, its length is designed to be longer than the level at which vortices are generated, and when the molten metal level falls below that length, it is submerged into the molten steel in step 111), so a part of it is always above the molten steel surface. This prevents the generation of vortices.
尚棒状物体のコストを低くするために、棒状物体の長さ
を短かくし、渦流の発生するレベル付近では、溶鋼にフ
ロートさせることで渦流を防止し、棒状物体の長さ以下
となった時点で111)以下の動作を行なわせることで
同じ効果を得ることもできる。In order to reduce the cost of the rod-shaped object, the length of the rod-shaped object is shortened, and near the level where vortices occur, it is floated in the molten steel to prevent the eddy current, and when the rod-shaped object becomes less than the length of the rod, the vortex is prevented. 111) The same effect can also be obtained by performing the following operations.
■)のステップで湯面の下降速度に同調して該棒状物体
を下降し、出湯孔上部に達した後、流出量調節手段によ
り出湯孔を閉止することでスラグを流出させることなく
溶鋼を最大限に利用することが可能となる。尚スラグ流
出をさらに確実に防止するためには、棒状物体の下降速
度を湯面の下降速度より速くすればよい。この場合は溶
鋼が、若干量残るが、問題となるレベルではない。In step (2), the rod-shaped object is lowered in synchronization with the descending speed of the molten metal surface, and after reaching the upper part of the tap hole, the tap hole is closed by the outflow rate adjusting means to maximize the molten steel without causing slag to flow out. It can be used for a limited time. In order to more reliably prevent the slag from flowing out, the descending speed of the rod-shaped object may be made faster than the descending speed of the molten metal surface. In this case, a small amount of molten steel remains, but it is not at a level that poses a problem.
第1図は本発明に係る取鍋内スラグ流出防止装置を表わ
す図である。取鍋10の底部に設けられたロングノズル
12の途中にはスライディングノズル14が設けられ、
取鍋10内の溶鋼16の流出量が調節される。17はス
ラグ層を表わしている。ロングノズル12の上方にワイ
ヤ28で釣支された棒状物体18は、モータンUの回転
によって回転するウィンチ32で巻き上げ巻き降ろされ
ることによってロングノズル12上方で上下する。FIG. 1 is a diagram showing a device for preventing slag outflow in a ladle according to the present invention. A sliding nozzle 14 is provided in the middle of a long nozzle 12 provided at the bottom of the ladle 10,
The amount of outflow of molten steel 16 in ladle 10 is adjusted. 17 represents a slag layer. A rod-shaped object 18 suspended above the long nozzle 12 by a wire 28 is raised and lowered by a winch 32 that rotates as the motor U rotates, thereby moving up and down above the long nozzle 12.
ワイヤ28の途中にはロードセル24が設けられ、ワイ
ヤ28の張力が測定される。パルス発生器22はウィン
チ32の回転に応じてパルスを発生し、このパルスをカ
ウントすることによって棒状物体18の鉛直方向の位置
が測定される。パルス発生器22からのパルスおよびロ
ードセル24からの信号はシーケンサ30に人力され、
シーケン(9)
(10)
サ30からの信号に応じてモーフ20およびスライディ
ングノズル14が制御される。又26は鍋蓋を表わす。A load cell 24 is provided in the middle of the wire 28, and the tension of the wire 28 is measured. The pulse generator 22 generates pulses in response to the rotation of the winch 32, and by counting these pulses, the vertical position of the rod-shaped object 18 is measured. Pulses from the pulse generator 22 and signals from the load cell 24 are input to a sequencer 30,
Sequence (9) (10) The morph 20 and the sliding nozzle 14 are controlled according to the signal from the sensor 30. 26 also represents a pot lid.
予熱時は、この鍋蓋26とスラグ層17の間の位置に棒
状物体18はセットされ、鍋内の雲囲気温度により自然
に予熱される。During preheating, the rod-shaped object 18 is set at a position between the pot lid 26 and the slag layer 17, and is naturally preheated by the ambient air temperature inside the pot.
尚、ロードセル24およびワイヤ28の周囲には過熱に
よる損傷を防ぐため、冷却用媒体を通すための配管を設
けることが好適である。Note that, in order to prevent damage due to overheating, it is preferable to provide piping for passing a cooling medium around the load cell 24 and the wire 28.
又、ロングノズル12と棒状物体18の位置を調整する
ための機能をワイヤ28の上方に設けても艮いが、通常
取鍋IUはほぼ所定の位置にセットされるためなくても
良い。Further, a function for adjusting the positions of the long nozzle 12 and the rod-shaped object 18 may be provided above the wire 28, but it is not necessary since the ladle IU is normally set at approximately a predetermined position.
第2図は第1図の装置の制御方法を説明するための図で
ある。また、第3図はシーケンサ30の制御のフローチ
ャートである。第1図と共に第2図および第3図を参照
して本発明に係る制御方法の一例を説明する。FIG. 2 is a diagram for explaining a method of controlling the apparatus shown in FIG. 1. Further, FIG. 3 is a flowchart of control of the sequencer 30. An example of the control method according to the present invention will be described with reference to FIG. 1, as well as FIGS. 2 and 3.
溶鋼16を入れた取鍋10が所定の位置に設置されたら
、スライディングノズル(SN)14が開かれて溶鋼の
取出しが開始されると共に、アーム34が旋回されて耐
火物製のストッパ18がノズル12の上方へ位置される
。所定時間待機して湯面レベルが第2図(a)欄に示す
程度まで低下するのを待って(第3図ステップaン、ス
トッパ18は第2図(a)欄に示す予熱位置まで下降さ
れ保持される(ステップb)。湯面レベルが所定値例え
ば700mmまで低下したら(ステップC)、湯面レベ
ルの下降速度よりも充分速い速度で下降され(ステップ
d)、ロードセル24が示す値がストッパの重量から溶
鋼の浮力を差し引いた値以上に低トしたら(ステップe
)ノズル12上部に達したものとして下降を停止しく第
2図(b)欄、第3図ステップf)、このときの鉛直方
向の位置を位置の零点とする。尚、溶鋼に渦流が発生す
る場面レベルは一般に500胴程度とされており、前述
の700mmはこれより充分に高いレベルである。When the ladle 10 containing the molten steel 16 is installed at a predetermined position, the sliding nozzle (SN) 14 is opened to start taking out the molten steel, and the arm 34 is rotated so that the refractory stopper 18 closes the nozzle. It is located above 12. After waiting for a predetermined period of time until the hot water level drops to the level shown in column (a) of Fig. 2 (step a in Fig. 3), the stopper 18 is lowered to the preheating position shown in column (a) of Fig. 2. (step b). When the hot water level drops to a predetermined value, for example 700 mm (step C), the hot water level is lowered at a speed sufficiently faster than the falling speed of the hot water level (step d), and the value indicated by the load cell 24 is When the weight of the stopper is lower than the value obtained by subtracting the buoyancy of the molten steel (step e)
) When the upper part of the nozzle 12 is reached, the descending is stopped (see column (b) in FIG. 2, step f) in FIG. 3), and the vertical position at this time is set as the zero point of the position. Incidentally, the level at which vortices occur in molten steel is generally considered to be about 500 mm, and the above-mentioned 700 mm is a sufficiently higher level than this.
次に零点に対して30〜100mm上昇されて保持され
る(第2図(C)欄、第3図ステップg)。この際の上
昇するストロークは、取鍋からの注入速度に支障を与え
ない範囲で低ければ低い程良いロー(11)
(12)
ドセル24からの値Wを連続的に監視し、その急変があ
ると、スラグと溶鋼の境界面がストッパ18下端近くに
達したものとして(第2図(d)欄)、その後は湯面レ
ベルの下降速度に同調もしくはそれ以上の速度でストッ
パ18が下降される(第2図(e)欄、第3図ステップ
J)。ストッパ18が鉛直方向の零点近くへ達したら(
ステップk)、スライディングノズル14が閉止され、
溶鋼の取り出しが終了する(第2図(f)欄、第3図ス
テップl)。Next, it is raised 30 to 100 mm from the zero point and held (column (C) in FIG. 2, step g in FIG. 3). The lower the rising stroke at this time is, the better, as long as it does not interfere with the pouring speed from the ladle. Assuming that the interface between the slag and molten steel has reached near the lower end of the stopper 18 (FIG. 2 (d) column), the stopper 18 is then lowered at a speed that is equal to or faster than the lowering speed of the molten metal level. (Figure 2 (e) column, Figure 3 step J). When the stopper 18 reaches near the zero point in the vertical direction (
step k), the sliding nozzle 14 is closed;
The removal of the molten steel is completed (FIG. 2 (f) column, FIG. 3 step 1).
第4図は第z図の(a)〜(d)迄の動作をさせたとき
のロードセルの値Wの実測値を示している。八で示す期
間は第2図(a)欄に示す予熱中の状態である。Bで示
す期間は第2図(a)欄から(b)欄への下降中の期間
であり、ノズル上部へ到達するとWは急激に低下する。FIG. 4 shows actual measured values of the load cell value W when the operations (a) to (d) in FIG. z are performed. The period indicated by 8 is the preheating state shown in column (a) of FIG. The period indicated by B is the period during the descent from column (a) to column (b) in FIG. 2, and when reaching the upper part of the nozzle, W rapidly decreases.
Cで示す期間は第2図(b)欄から(C)欄で示す位置
までの上昇期間である。その後、湯面レベルの低下と共
に浮力が低下し、Wは徐々に増加していく。Dで示す点
でWは急変しており、これが第2図((1)欄に示す状
態に対応している。Eはスライディングノズルを閉止を
開始したタイミングを表わしている。The period indicated by C is the rising period from the column (b) in FIG. 2 to the position indicated in column (C). Thereafter, as the hot water level decreases, the buoyancy decreases and W gradually increases. W suddenly changes at the point indicated by D, which corresponds to the state shown in column (1) of FIG. 2. E indicates the timing at which the sliding nozzle started to close.
第5図は第4図のE付近の拡大図である。同図に示すよ
うに、通常はこの急変の後にスライディングノズルの閉
止が行なわれている。したがって急変確認とともに棒状
物体を下降し、出湯孔上部に達した後、スライディング
ノズルを閉止することにより、スラグの流出を防止する
ことができる。FIG. 5 is an enlarged view of the area near E in FIG. 4. As shown in the figure, the sliding nozzle is normally closed after this sudden change. Therefore, when a sudden change is confirmed, the rod-shaped object is lowered, and after reaching the upper part of the tapping hole, the sliding nozzle is closed, thereby preventing the slag from flowing out.
し発明の効果」
以上述べてきたように本発明によれば、渦流の発生が防
止されてスラグの流出を防止することが出来ると共に、
スラグ流出のタイミングを正確につかむことで、歩留り
が向上する効果が得られる。Effects of the Invention As described above, according to the present invention, it is possible to prevent the generation of vortices and the outflow of slag, and
By accurately grasping the timing of slag outflow, the yield can be improved.
第1図は本発明の一実施例を表わす図、第2図はスラグ
流出防止のための制御を説明するための図、
第3図は処理のフローチャート、
(13)
(14)
第4図は本発明の装置と方法においてロードセル値Wの
時間変化を表わす図、
第5図は第4図の一部の拡大図。
図において、
10・・・取鍋、 I2・・・ロングノズル、
14・・・スライディングノズノペ
16・・・溶鋼、 17・・・スラグ、18・
・・ストッパ、 22・・・パルス発生器、24・・
・ロードセル。Fig. 1 is a diagram showing an embodiment of the present invention, Fig. 2 is a diagram for explaining control for preventing slag outflow, Fig. 3 is a flowchart of the process, (13) (14) Fig. 4 is A diagram showing the change in load cell value W over time in the apparatus and method of the present invention. FIG. 5 is an enlarged view of a part of FIG. 4. In the figure, 10...Ladle, I2...Long nozzle,
14... Sliding nozzle 16... Molten steel, 17... Slag, 18.
...Stopper, 22...Pulse generator, 24...
・Load cell.
Claims (1)
の溶鋼流出量を調節する流出量調節手段(14)を有す
る取鍋(10)からのスラグの流出を防止するための装
置であって、 溶鋼(16)に渦流が発生する溶鋼レベル以上の鉛直方
向の長さを有し、底部に該出湯孔(12)上部と係合す
る形状を有し、溶鋼の比重よりも大である比重を有する
棒状物体(18)と、 該棒状物体(18)を昇降させる昇降手段(20)と、 該棒状物体(18)の鉛直方向の位置を計測する位置計
測手段(22)と、 該棒状物体(18)の釣支力を計測する釣支力計測手段
(24)とを具備することを特徴とする取鍋内スラグ流
出防止装置。 2、請求項1記載の装置を制御する方法であって、 i)該棒状物体(18)が湯面上方に保持されたときに
該棒状物体(18)が予熱されて溶鋼へ突入した時にス
ラグ、溶鋼の付着が防止されるに充分な高さまで湯面レ
ベルが低下した後、該棒状物体(18)を下降させて湯
面上方に保持し、 ii)溶鋼へ突入した時にスラグ、溶鋼の付着が防止さ
れるに充分な時間が経過し、 iii)湯面レベルが該棒状物体の鉛直方向の長さ程度
に低下後、該棒状物体の下降を開始し、iv)該棒状物
体の釣支力が該棒状物体(18)の重量から溶鋼の浮力
を差し引いた値以下になった後、該棒状物体(18)が
出湯孔(12)上部に達したものとして下降を停止して
所定の高さだけ上昇して保持し、 v)該棒状物体(18)の重量が急変したとき、湯面下
降速度に同調してもしくはそれ以上の速度で該棒状物体
を下降させ、 vi)該棒状物体(18)が出湯孔(12)上部に達し
て後、該流出量調節手段(14)により出湯孔(12)
を閉塞することを特徴とする取鍋内スラグ流出防止装置
の制御方法。[Claims] 1. Slag from a ladle (10) having a tapping hole (12) at the bottom and an outflow amount adjusting means (14) for adjusting the amount of molten steel flowing out from the tapping hole (12). A device for preventing outflow, having a length in the vertical direction equal to or higher than the molten steel level at which a vortex is generated in the molten steel (16), and having a shape at the bottom that engages with the upper part of the tapping hole (12). , a rod-shaped object (18) having a specific gravity greater than the specific gravity of molten steel, a lifting means (20) for raising and lowering the rod-shaped object (18), and a position for measuring the vertical position of the rod-shaped object (18). A device for preventing slag outflow in a ladle, comprising a measuring means (22) and a supporting force measuring means (24) for measuring the supporting force of the rod-shaped object (18). 2. A method for controlling the apparatus according to claim 1, comprising: i) when the rod-shaped object (18) is held above the molten metal surface and the rod-shaped object (18) is preheated and plunges into the molten steel, slag is generated; , after the molten metal level has fallen to a sufficient height to prevent the adhesion of molten steel, the rod-shaped object (18) is lowered and held above the molten metal surface, and ii) when it plunges into the molten steel, it prevents the adhesion of slag and molten steel. iii) after the hot water level has decreased to about the vertical length of the rod-shaped object, the rod-shaped object begins to descend, and iv) the suspension force of the rod-shaped object is reduced. becomes less than the value obtained by subtracting the buoyancy of the molten steel from the weight of the rod-shaped object (18), the rod-shaped object (18) is assumed to have reached the upper part of the tapping hole (12), and stops descending to a predetermined height. v) When the weight of the rod-shaped object (18) suddenly changes, the rod-shaped object (18) is lowered at a speed equal to or higher than the rate of descent of the hot water level, vi) the rod-shaped object (18) ) reaches the upper part of the tap hole (12), the outflow amount adjusting means (14) lowers the tap hole (12).
A method for controlling a device for preventing slag outflow in a ladle, the method comprising: blocking a slag outflow prevention device in a ladle.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1136206A JPH0642987B2 (en) | 1989-05-31 | 1989-05-31 | Apparatus and method for preventing outflow of slag in ladle |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1136206A JPH0642987B2 (en) | 1989-05-31 | 1989-05-31 | Apparatus and method for preventing outflow of slag in ladle |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH035067A true JPH035067A (en) | 1991-01-10 |
JPH0642987B2 JPH0642987B2 (en) | 1994-06-08 |
Family
ID=15169803
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1136206A Expired - Lifetime JPH0642987B2 (en) | 1989-05-31 | 1989-05-31 | Apparatus and method for preventing outflow of slag in ladle |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0642987B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009144656A (en) * | 2007-12-17 | 2009-07-02 | Aisin Seiki Co Ltd | Oil tank |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60210352A (en) * | 1984-04-02 | 1985-10-22 | Nippon Steel Corp | Prevention of outflow of slag from tap hole of vessel for molten metal |
JPS60186963U (en) * | 1984-05-22 | 1985-12-11 | 株式会社クボタ | Sliding nozzle pouring device |
JPS62203667A (en) * | 1986-03-05 | 1987-09-08 | Nippon Steel Corp | Closing method for ladle tap hole |
-
1989
- 1989-05-31 JP JP1136206A patent/JPH0642987B2/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60210352A (en) * | 1984-04-02 | 1985-10-22 | Nippon Steel Corp | Prevention of outflow of slag from tap hole of vessel for molten metal |
JPS60186963U (en) * | 1984-05-22 | 1985-12-11 | 株式会社クボタ | Sliding nozzle pouring device |
JPS62203667A (en) * | 1986-03-05 | 1987-09-08 | Nippon Steel Corp | Closing method for ladle tap hole |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009144656A (en) * | 2007-12-17 | 2009-07-02 | Aisin Seiki Co Ltd | Oil tank |
Also Published As
Publication number | Publication date |
---|---|
JPH0642987B2 (en) | 1994-06-08 |
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