JPH0780039B2 - A method for detecting drift of molten steel into the mold during continuous casting. - Google Patents
A method for detecting drift of molten steel into the mold during continuous casting.Info
- Publication number
- JPH0780039B2 JPH0780039B2 JP61037606A JP3760686A JPH0780039B2 JP H0780039 B2 JPH0780039 B2 JP H0780039B2 JP 61037606 A JP61037606 A JP 61037606A JP 3760686 A JP3760686 A JP 3760686A JP H0780039 B2 JPH0780039 B2 JP H0780039B2
- Authority
- JP
- Japan
- Prior art keywords
- molten steel
- mold
- flow
- level
- eddy current
- 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.)
- Expired - Lifetime
Links
- 229910000831 Steel Inorganic materials 0.000 title claims description 61
- 239000010959 steel Substances 0.000 title claims description 61
- 238000009749 continuous casting Methods 0.000 title claims description 13
- 238000000034 method Methods 0.000 title claims description 13
- 238000007654 immersion Methods 0.000 claims description 28
- 239000002184 metal Substances 0.000 claims description 27
- 238000005266 casting Methods 0.000 claims description 8
- 238000007598 dipping method Methods 0.000 claims description 6
- 230000001174 ascending effect Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 description 12
- 230000004907 flux Effects 0.000 description 7
- 230000000630 rising effect Effects 0.000 description 5
- 239000002562 thickening agent Substances 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
Landscapes
- Continuous Casting (AREA)
Description
【発明の詳細な説明】 〈発明の目的〉 産業上の利用分野 本発明は連続鋳造時の鋳型内への溶鋼の偏流を検出する
方法に係り、詳しくは、連続鋳造時、鋳型内に浸漬ノズ
ルにより鋳込まれる溶鋼流の偏流を検出する方法に係
る。DETAILED DESCRIPTION OF THE INVENTION Object of the Invention The present invention relates to a method for detecting a drift of molten steel in a mold during continuous casting, and more specifically, a dipping nozzle in the mold during continuous casting. The present invention relates to a method for detecting uneven flow of a molten steel flow cast by.
従来の技術 一般に、連続鋳造における溶鋼中の非金属介在物は、溶
鋼の注入流によって鋳片内部まで持込まれ、その大部分
は湯面上に浮上するが、残る一部は鋳片内にそのまま捕
捉される。この捕捉される非金属介在物の量は鋳込み時
の鋳片内溶鋼流によって大きく変化することが知られて
おり、浸漬ノズルから吐出される溶鋼流が広い範囲に渡
って大きく、かつ、深くなればなる程、増加する傾向に
ある。従って、連続鋳造において、浸漬ノズルから吐出
される溶鋼流が鋳片内に深く達しないように、浸漬ノズ
ルは側方に吐出孔を有する形状とされ、しかも、鋳型内
溶鋼表面に浮遊する表面被覆用フラックスを巻込まぬよ
うに、上記吐出孔は若干下向きとされて使用されてい
る。Conventional technology Generally, non-metallic inclusions in molten steel in continuous casting are carried into the slab by the injection flow of molten steel, and most of them float above the molten metal surface, but the remaining part remains in the slab. To be captured. It is known that the amount of non-metallic inclusions trapped varies greatly depending on the molten steel flow in the cast during casting, and the molten steel flow discharged from the immersion nozzle can be large and deep over a wide range. The higher the number, the more likely it is to increase. Therefore, in continuous casting, the immersion nozzle has a shape having discharge holes on the side so that the molten steel flow discharged from the immersion nozzle does not reach deep inside the slab, and furthermore, the surface coating floating on the molten steel surface in the mold. The discharge holes are used in a slightly downward direction so as not to entrain the flux for use.
第４図はその説明図であり、スラブ連鋳機において浸漬
ノズル２は鋳型１の中央に配置され、その吐出孔５は鋳
型１の短辺側に向けられ、吐出孔５から吐出される溶鋼
は、図中、矢印６の如く流動する。すなわち、吐出孔５
からの溶鋼流は貯留溶鋼４中を流れる間にその速度を減
少し、鋳型１の短辺側壁面への衝突によって、反転流と
なり、この反転流の一方は湯面側に上昇する上昇流、他
方は下方へ向う下降流となり、この間に大きく減速され
る結果、上昇流は湯面上のフラックス３を湯中に巻込む
ことなく、また、下降流は鋳込中に深く到達しないよう
にして、鋳片品質を高める鋳造が行なわれている。FIG. 4 is an explanatory view thereof, and in the slab continuous casting machine, the immersion nozzle 2 is arranged at the center of the mold 1, and its discharge hole 5 is directed to the short side of the mold 1 and discharged from the discharge hole 5. Flows as indicated by arrow 6 in the figure. That is, the discharge hole 5
The molten steel flow from the molten steel flow decreases its velocity while flowing in the stored molten steel 4, and becomes a reversing flow due to collision with the short side wall surface of the mold 1, one of the reversing flows rising to the molten metal side, The other becomes a downward flow downward and is greatly decelerated during this, so that the upward flow does not involve the flux 3 on the surface of the molten metal in the molten metal, and the downward flow does not reach deep during casting. , Casting is performed to improve the quality of the slab.
しかしながら、第４図の関係は両吐出孔５からの溶鋼流
が均等の場合に生ずるもので、浸漬ノズル２上のスライ
ディングノズルの絞り開度、鋳込速度等により浸漬ノズ
ル２を下降する溶鋼流動にゆらぎを生じた場合、あるい
は、浸漬ノズル内壁にアルミナ等非金属介在物の付着を
生じた場合には、吐出孔５の均等関係はくずれ、何れか
一方の吐出孔５からの溶鋼流動が強くなり、所謂、偏流
が生じることになる。この偏流を生じると、第５図に示
す如く、鋳型内溶鋼流６のうち、強い流動を生じた側
は、上昇流あるいは下降流が強くなる結果、フラックス
巻込みあるいは鋳片内部深くまで下降流が達し、これに
よって内部品質の悪化を生じる。However, the relationship shown in FIG. 4 occurs when the molten steel flows from both discharge holes 5 are even, and the molten steel flow descending the dipping nozzle 2 depends on the throttle opening of the sliding nozzle on the dipping nozzle 2, the casting speed, and the like. Fluctuations or when non-metallic inclusions such as alumina adhere to the inner wall of the immersion nozzle, the discharge holes 5 lose their uniformity and the molten steel flow from either discharge hole 5 is strong. Therefore, so-called drift will occur. When this uneven flow is generated, as shown in FIG. 5, of the molten steel flow 6 in the mold, the side that has generated a strong flow has a strong upflow or downflow, resulting in flux entrainment or downflow deep inside the slab. Is reached, which causes deterioration of internal quality.
従来、前記偏流の発生等を測定する方法としては、特開
昭59-104512号公報に係る“連続鋳造時の鋳込流測定方
法”又は鋳型内溶鋼表面の挙動を測定するものとして、
特開昭55-149017号公報が提案されているのみである。Conventionally, as a method of measuring the occurrence of the drift, etc., as a "method of measuring the casting flow during continuous casting" or measuring the behavior of the molten steel surface in the mold according to JP-A-59-104512.
Only JP-A-55-149017 is proposed.
前者は、鋳型内の溶融金属中に受圧体を挿入して、この
受圧体により溶融金属流体の圧力を検出し、鋳込流の状
態を把握する方法であり、後者では、湯面検出センサー
を湯面と湯面検出センサー間の距離を一定に保って追従
駆動される追従駆動部に支持し、湯面振動を検出し、フ
ラックス等の巻込みを察知する方法である。The former is a method of inserting a pressure receiving body into the molten metal in the mold, detecting the pressure of the molten metal fluid by this pressure receiving body, and grasping the state of the pouring flow. This is a method of detecting the vibration of the molten metal surface and detecting the entrainment of flux etc. by supporting the molten metal surface and a molten metal surface detection sensor on a follow-up drive unit that is driven and driven while keeping a constant distance.
しかしながら、前者技術では、使用する受圧体が鋳込中
を通じて溶融金属中に浸漬使用できる耐久性を持つ必要
があり、溶鋼は高温度であることから極めて実施は困難
であり、また、浸漬した受圧体には浮上してくる介在物
の付着を生じ、該介在物の剥離等による鋳片内部の汚染
をも生じる問題がある。However, in the former technology, the pressure receiver to be used must be durable enough to be immersed in the molten metal during casting, and it is extremely difficult to carry out because the molten steel is at a high temperature. There is a problem that floating inclusions are attached to the body, and the inside of the slab is also contaminated due to peeling of the inclusions.
また、後者では、単に鋳型内溶鋼表面の振動を検出する
ものであるから、浸漬ノズル内壁へのアルミナ付着防止
として吹込まれる不活性ガスによる影響等の問題の外、
湯面検出センサーの駆動方式が実施上問題となり、高温
環境下での信頼性の高い手段が必要とされる問題があ
る。Further, in the latter, since it is simply to detect the vibration of the molten steel surface in the mold, in addition to the problem such as the influence of the inert gas blown to prevent alumina adhesion to the inner wall of the immersion nozzle,
The driving method of the molten metal level detection sensor becomes a problem in practice, and there is a problem that a highly reliable means in a high temperature environment is required.
発明が解決しようとする問題点 本発明はこれらの問題点の解決を目的とし、具体的に
は、中央の浸漬ノズルと鋳型短辺との間にそれぞれ２つ
の渦流式レベル計を配置するとともに、一方の渦流式レ
ベル計によって、鋳型短辺に衝突反転上昇する上昇流が
湯面に達するところのレベルを検出する一方、他方の渦
流式レベル計によって、上記上昇流の影響をうけないと
ころのレベルを検出し、これらの間のレベル値の偏差か
ら鋳型内への溶鋼の偏流を検出する方法を提案する。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention The present invention aims to solve these problems. Specifically, two swirl level meters are arranged between the central immersion nozzle and the mold short side, and One of the eddy current level meters detects the level at which the ascending flow that rises up against the shorter side of the mold reaches the molten metal surface, while the other eddy current level meter detects the level at the place where it is not affected by the above upflow. We propose a method to detect the drift of molten steel into the mold from the deviation of the level value between them.
〈発明の構成〉 問題点を解決するための手段ならびにその作用 すなわち、本発明方法は、鋳型の両短片間に指向する溶
鋼吐出孔を有する浸漬ノズルが鋳型の中央に配置され、
これら溶鋼吐出孔から連続的に溶鋼を鋳型に連続鋳造す
る際に、中央の浸漬ノズルと鋳型短辺の間に、それぞれ
渦流式レベル計を２個づつ、合計で４個配置し、浸漬ノ
ズルと一方の鋳型短辺の間の渦流式レベル計のうちで、
鋳型短辺側の一方の渦流式レベル計によって、鋳型短辺
に衝突し上向きに反転する上昇流が湯面に達するところ
の溶鋼レベルを検出する一方、浸漬ノズル側の他方の渦
流式レベル計によって、浸漬ノズルに寄せられて、しか
も、上昇流の影響範囲外のところの溶鋼レベルを検出
し、その後、これら溶鋼レベル間で偏差値を求めて、こ
の溶鋼レベルの偏差値にもとずいて鋳型内への溶鋼の吐
出流の偏流を検出することを特徴とする。<Structure of the invention> Means for solving the problem and its action That is, the method of the present invention, the immersion nozzle having a molten steel discharge hole directed between the two short pieces of the mold is arranged in the center of the mold,
When continuously casting molten steel into the mold from these molten steel discharge holes, two swirl level meters are arranged between the central dipping nozzle and the short side of the mold, four in total. Of the eddy current level meters between the short sides of one mold,
The eddy current level meter on the short side of the mold detects the molten steel level where the upward flow that collides with the short side of the mold and reverses upward reaches the molten metal surface, while the other eddy current level meter on the immersion nozzle side , The molten steel level that is brought to the immersion nozzle and is outside the range of influence of the upward flow is detected, and then the deviation value is calculated between these molten steel levels, and the mold is determined based on the deviation value of this molten steel level. It is characterized in that the drift of the discharge flow of molten steel into the inside is detected.
以下、図面を用いて本発明の構成ならびに作用を説明す
ると、次の通りである。The structure and operation of the present invention will be described below with reference to the drawings.
なお、第１図は本発明における渦流式レベル計の配置を
示す説明図であり、第２図は本発明に係る検出方法にお
ける渦流式レベル計の配置および偏差の検出回路を示す
説明図であり、第３図は渦流式レベル計による湯面振動
を検出する検出回路の説明図であり、第４図はスラブ連
鋳機において、浸漬ノズルから吐出される溶鋼流の流動
状況を説明する説明図であり、第５図は第４図において
偏流時の溶鋼の流動状況を説明する説明図である。1 is an explanatory view showing the arrangement of the eddy current level meter according to the present invention, and FIG. 2 is an explanatory view showing the arrangement of the eddy current level meter and the deviation detection circuit in the detection method according to the present invention. FIG. 3 is an explanatory view of a detection circuit for detecting molten metal surface vibration by the vortex flow level meter, and FIG. 4 is an explanatory view explaining a flow state of the molten steel flow discharged from the immersion nozzle in the slab continuous casting machine. FIG. 5 is an explanatory view for explaining the flow state of molten steel at the time of uneven flow in FIG.
本発明で用いる渦流式レベル計とは、例えば、特開昭53
-76926号公報でも開示されるが、その一例を第３図に示
す。渦流式レベル計の検出ヘッドは、１次コイル7bと２
次コイル7cとを具え、これらコイルが空冷構造ヘッド7a
で空冷されるよう構成されている。この測定回路におい
て出力電圧Eoutは次式で表わされる。The eddy current level meter used in the present invention is, for example, Japanese Patent Laid-Open No.
-76926, an example is shown in FIG. The detection head of the eddy current level meter has primary coils 7b and 2
Next coil 7c and these coils are air-cooled structure head 7a
It is configured to be air cooled. In this measuring circuit, the output voltage Eout is expressed by the following equation.
ここで、Eout:出力電圧 E0 :発信器電圧 G1 :帰還増巾器増巾器 G2 :差動増巾器増巾率 K :R1／（R1＋R2） h :湯面からの距離 ｆ（ｈ）：湯面からの距離に対応したコイル電
圧差 従って、渦流式レベル計では、フラックス層の影響を受
けず、溶鋼湯面を検知することができる。 Here, Eout: Output voltage E 0 : Oscillator voltage G 1 : Feedback thickener Thickener G 2 : Differential thickener Thickening ratio K: R 1 / (R 1 + R 2 ) h: From the surface Distance f (h): Coil voltage difference corresponding to the distance from the molten metal surface Therefore, the eddy current level meter can detect the molten steel molten metal surface without being affected by the flux layer.
これら渦流式レベル計７、８は、次のように、ちなみ
に、第１図ならびに第２図に示すように、配置して、鋳
型内へ浸漬ノズル２から吐出される溶鋼流の偏流を検出
する。These vortex level gauges 7 and 8 are arranged as shown in FIGS. 1 and 2 to detect uneven flow of the molten steel flow discharged from the immersion nozzle 2 into the mold as follows. .
第１図において、符号１は鋳型、３はフラックス、４は
鋳型１内にある溶鋼を示す。この連鋳鋳型４の略々中央
に浸漬ノズル２を配置し、浸漬ノズル２の下端に一対の
吐出孔５、５を下向きに形成し、これら各吐出孔５、５
から鋳型１の短辺1bに向けて溶鋼流６が吐出される。In FIG. 1, reference numeral 1 represents a mold, 3 represents a flux, and 4 represents molten steel in the mold 1. The immersion nozzle 2 is arranged substantially in the center of the continuous casting mold 4, and a pair of discharge holes 5 and 5 are formed at the lower end of the immersion nozzle 2 so as to face downward.
The molten steel flow 6 is discharged from the mold 1 toward the short side 1b of the mold 1.
この鋳型１において、その短辺1aと中央の浸漬ノズル２
との間に、それぞれ、少なくとも２個の渦流式レベル計
７、８を配置する。In this mold 1, the short side 1a and the central immersion nozzle 2
And at least two vortex level gauges 7 and 8 are respectively arranged between and.
すなわち、中央の浸漬ノズル２の一つの吐出孔５から吐
出された溶鋼流６は短辺1aの内壁面に指向し、その溶鋼
流６は衝突する。反転した溶鋼流の一部は上昇し、その
上昇流が湯面に達し、反転した溶鋼流の他部は下降す
る。この現象は各吐出孔５毎に生じる。このため、一方
の渦流式レベル計７を上昇流が上昇して湯面に達する位
置のレベルを測定できるところに配置し、他方の渦流式
レベル計８は浸漬ノズル側２に寄せ、反転上昇する上昇
流の影響範囲外のところのレベルを測定できる位置に配
置する。したがって、他方の渦流式レベル計８は浸漬ノ
ズル２と短辺1a間の略々中間点に配置される。That is, the molten steel flow 6 discharged from one discharge hole 5 of the central immersion nozzle 2 is directed to the inner wall surface of the short side 1a, and the molten steel flow 6 collides. A part of the reversed molten steel flow rises, the rising flow reaches the molten metal surface, and the other part of the reversed molten steel flow descends. This phenomenon occurs for each discharge hole 5. For this reason, one of the vortex flow level meters 7 is arranged at a position where the level at the position where the ascending flow rises and reaches the molten metal surface can be measured, and the other vortex flow level meter 8 is moved closer to the immersion nozzle side 2 and rises in reverse. It is placed at a position where the level can be measured outside the range of influence of upflow. Therefore, the other vortex flow level meter 8 is arranged at approximately the midpoint between the immersion nozzle 2 and the short side 1a.
また、一方の渦流式レベル計７側は浸漬ノズル２の浸漬
深さ（湯表面から吐出孔までの深さ）にもよるが、略々
短辺より100mm離れた位置に設置される。The eddy current level meter 7 side is installed at a position approximately 100 mm away from the short side, although it depends on the immersion depth of the immersion nozzle 2 (depth from the molten metal surface to the discharge hole).
なお、浸漬ノズル２の他方の吐出孔５側でも同様に２つ
の渦流式レベル計７′、８′を配置し、合計して４個の
渦流式レベル計７、８、７′、８′によって溶鋼又は湯
面レベルを検出する。In addition, two vortex type level meters 7 ', 8'are similarly arranged on the other discharge hole 5 side of the immersion nozzle 2, and a total of four vortex type level meters 7, 8, 7', 8'are provided. Detects molten steel or molten metal level.
第２図に全体の配置例および偏差の検出回路を示す。FIG. 2 shows an example of the entire arrangement and a deviation detection circuit.
第２図において、４ケ所の湯面レベルの検出がなされ
る。図中に示す如く、短辺側に接近した湯面レベルと、
浸漬ノズル側に片寄った湯面レベルの偏差を求め、この
偏差をもとに偏流の発生を検出する。In FIG. 2, four molten metal levels are detected. As shown in the figure, the molten metal level near the short side,
The deviation of the molten metal surface level that is offset to the immersion nozzle side is obtained, and the occurrence of drift is detected based on this deviation.
すなわち、第１図において、 浸漬ノズル２で右の吐出孔５側に、片寄った偏流が生ず
れば、溶鋼流６は流速が上り、短片1a衝突後の反転流も
強くなるため、その一つの上昇流６によって湯面が持ち
上り、隆起表面Ａが生ずる。この隆起表面Ａは一方の渦
流式レベル計７でレベル変化として検出され、他方の渦
流式レベル計８で検出されるレベル値と比較されること
によって隆起量が求められ、この隆起量が偏差になる。
従って、偏差値をもとに偏流の発生が検出でき、かつ、
その偏流程度も同時に把握できる。That is, in FIG. 1, if an uneven drift occurs on the right discharge hole 5 side in the immersion nozzle 2, the molten steel flow 6 increases in flow velocity and the reversal flow after collision with the short piece 1a also becomes strong. The rising surface 6 lifts the surface of the molten metal, resulting in a raised surface A. This raised surface A is detected as a level change by one eddy current level meter 7, and compared with the level value detected by the other eddy current level meter 8 to obtain the amount of uplift, and this amount of uplift is a deviation. Become.
Therefore, the occurrence of drift can be detected based on the deviation value, and
The degree of the drift can be grasped at the same time.
上記偏差の発生又は品質上許容できる偏差値を超えた場
合に警報等を発することとすれば、鋳片品質の不良等の
防止を図ることができる。If an alarm or the like is issued when the above deviation occurs or the deviation value exceeds an allowable deviation value in terms of quality, it is possible to prevent defective slab quality and the like.
なお、渦流式レベル計は本発明に係る検出方法において
は固定的に配置することもでき、検出手段は複雑な構成
を必要としないので、実用上の大きな利点が得られる。
また、鋳片の幅寸法の変化に対応しては、短辺側の一方
の渦流式レベル計の配置位置を移動するだけで対処する
ことが可能である。The eddy current level meter can be fixedly arranged in the detection method according to the present invention, and the detection means does not require a complicated structure, so that a great practical advantage can be obtained.
Further, it is possible to deal with the change in the width dimension of the slab by simply moving the position of one of the eddy current level meters on the short side.
〈発明の効果〉 以上説明したように、本発明方法は、浸漬ノズルを連鋳
鋳型中央に配し、この浸漬ノズルの各吐出孔と鋳型短辺
との間においてそれぞれ２つの渦流式レベル計を配設し
て、一つの渦流式レベル計で上昇する溶鋼の上昇流が湯
面レベルに達するところの溶鋼レベルを求めるととも
に、他の渦流式レベル計で上昇流の影響範囲外の溶鋼レ
ベルを求め、更に、これらレベル値を対比としてその偏
差を求め、このレベル偏差をもとに、鋳型内への溶鋼の
吐出流の偏流を検出する。<Effects of the Invention> As described above, in the method of the present invention, the immersion nozzle is arranged in the center of the continuous casting mold, and two vortex flow level meters are provided between each discharge hole of the immersion nozzle and the short side of the mold. By arranging it, one eddy current level meter determines the molten steel level at which the rising flow of molten steel reaches the molten metal level, and the other vortex flow level meter determines the molten steel level outside the range of influence of the rising flow. Further, the deviation is obtained by comparing these level values with each other, and the deviation of the molten steel discharge flow into the mold is detected based on this level deviation.
したがって、本発明方法によると、鋳型内溶鋼偏流の発
生やその程度までを検出することができ、その偏流やそ
の程度の情報は連続鋳造に適切に反映させることがで
き、鋳片品質不良の防止を達成することができる。Therefore, according to the method of the present invention, it is possible to detect the occurrence of molten steel drift in the mold and its extent, and the information of the drift and its extent can be appropriately reflected in continuous casting, and the prevention of slab quality defects Can be achieved.
第１図は本発明における渦流式レベル計の配置を示す説
明図、第２図は本発明に係る検出方法における渦流式レ
ベル計の配置および偏差の検出回路を示す説明図、第３
図は渦流式レベル計による湯面振動を検出する検出回路
の説明図、第４図はスラブ連鋳機において、浸漬ノズル
から吐出される溶鋼流の流動状況を説明する説明図、第
５図は第４図において偏流時の溶鋼の流動状況を説明す
る説明図である。 符号１……鋳型 ２……浸漬ノズル ３……フラックス ４……溶鋼 ５……溶鋼の吐出孔 ６……溶鋼流 6a……正常時溶鋼流 6b……偏流時溶鋼流 ７……渦流式レベル計 7a……空冷冷却ヘッド 7b……１次コイル 7c……２次コイル ８……渦流式レベル計 ９……差動増幅器 10……加算器 11……直線検出器 12……リニアライザー 13……フィルター 14……帰還増幅器 15……発振器 16……偏差演算子 17……偏差信号 18……偏差チャートFIG. 1 is an explanatory view showing the arrangement of an eddy current level meter according to the present invention, and FIG. 2 is an explanatory view showing the arrangement of an eddy current level meter and a deviation detection circuit in a detection method according to the present invention.
FIG. 4 is an explanatory diagram of a detection circuit for detecting molten metal surface vibration by an eddy current level meter, FIG. 4 is an explanatory diagram illustrating a flow state of molten steel flow discharged from an immersion nozzle in a slab continuous casting machine, and FIG. It is explanatory drawing explaining the flow condition of the molten steel at the time of uneven flow in FIG. Reference numeral 1 ... Mold 2 ... Immersion nozzle 3 ... Flux 4 ... Molten steel 5 ... Molten steel discharge hole 6 ... Molten steel flow 6a ... Normal molten steel flow 6b ... Uneven drifting molten steel flow 7 ... Vortex flow level Total 7a …… Air cooling head 7b …… Primary coil 7c …… Secondary coil 8 …… Vortex flow level meter 9 …… Differential amplifier 10 …… Adder 11 …… Linear detector 12 …… Linearizer 13 …… ... Filter 14 ... Feedback amplifier 15 ... Oscillator 16 ... Deviation operator 17 ... Deviation signal 18 ... Deviation chart
Claims (1)
する浸漬ノズルが鋳型の中央に配置され、これら溶鋼吐
出孔から連続的に溶鋼を鋳型に連続鋳造する際に、中央
の浸漬ノズルと鋳型短辺の間に、それぞれ渦流式レベル
計を２個づつ、合計で４個配置し、浸漬ノズルと一方の
鋳型短辺の間の渦流式レベル計のうちで、鋳型短辺側の
一方の渦流式レベル計によって、鋳型短辺に衝突し上向
きに反転する上昇流が湯面に達するところの溶鋼レベル
を検出する一方、前記浸漬ノズル側の他方の渦流式レベ
ル計によって、前記浸漬ノズルに寄せられて、しかも、
前記上昇流の影響範囲外のところの溶鋼レベルを検出
し、その後、これら溶鋼レベル間で偏差値を求めて、こ
の溶鋼レベルの偏差値にもとずいて鋳型内への溶鋼の吐
出流の偏流を検出することを特徴とする連続鋳造時の鋳
型内への溶鋼の偏流を検出する方法。1. A dipping nozzle having a molten steel discharge hole directed between both short pieces of the mold is arranged at the center of the mold, and when continuously casting molten steel into the mold from these molten steel discharge holes, the central dipping nozzle. And two short eddy current level meters between the mold and the short side of the mold. A total of four vortex flow level meters are arranged. Eddy current level meter detects the molten steel level where the upward flow that collides with the short side of the mold and reverses upward reaches the molten metal surface, while the other eddy current level meter on the immersion nozzle side allows Sent to me, and
The molten steel level outside the range of influence of the ascending flow is detected, then the deviation value between these molten steel levels is determined, and the deviation of the molten steel discharge flow into the mold is determined based on this deviation value of the molten steel level. A method for detecting drift of molten steel in a mold during continuous casting, which is characterized by detecting
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61037606A JPH0780039B2 (en) | 1986-02-21 | 1986-02-21 | A method for detecting drift of molten steel into the mold during continuous casting. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61037606A JPH0780039B2 (en) | 1986-02-21 | 1986-02-21 | A method for detecting drift of molten steel into the mold during continuous casting. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62197255A JPS62197255A (en) | 1987-08-31 |
| JPH0780039B2 true JPH0780039B2 (en) | 1995-08-30 |
Family
ID=12502237
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61037606A Expired - Lifetime JPH0780039B2 (en) | 1986-02-21 | 1986-02-21 | A method for detecting drift of molten steel into the mold during continuous casting. |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0780039B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2720611B2 (en) * | 1991-03-12 | 1998-03-04 | 日本鋼管株式会社 | Steel continuous casting method |
| AU2001294237A1 (en) * | 2000-10-13 | 2002-04-22 | Heraeus Electro-Nite Japan, Ltd. | Method for measuring flow velocity of molten metal and its instrument, and measuring rod used for this |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5376926A (en) * | 1976-12-21 | 1978-07-07 | Nippon Kokan Kk | Molten metal level monitor controller of continuous casting machine that use eddy flow system range finder for measurement of molten metal level |
| JPS60180654A (en) * | 1984-02-29 | 1985-09-14 | Nippon Steel Corp | Method and device for controlling shape of bath surface in mold for continuous casting |
| JPS6293054A (en) * | 1985-10-17 | 1987-04-28 | Nippon Steel Corp | Method for detecting drift of molten steel in continuous casting mold |
-
1986
- 1986-02-21 JP JP61037606A patent/JPH0780039B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62197255A (en) | 1987-08-31 |
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