JPH0868682A - Molten metal level measuring method for twin belt continuous casting machine - Google Patents
Molten metal level measuring method for twin belt continuous casting machineInfo
- Publication number
- JPH0868682A JPH0868682A JP6207572A JP20757294A JPH0868682A JP H0868682 A JPH0868682 A JP H0868682A JP 6207572 A JP6207572 A JP 6207572A JP 20757294 A JP20757294 A JP 20757294A JP H0868682 A JPH0868682 A JP H0868682A
- Authority
- JP
- Japan
- Prior art keywords
- molten metal
- short side
- level
- metal level
- signal
- 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.)
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- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
- Continuous Casting (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、双ベルト式連続鋳造機
の湯面レベル計測方法に関し、更に詳述すれば、金属ベ
ルトと短辺とで形成した鋳型を装備する双ベルト式連続
鋳造機の鋳型内部の湯面レベル計測方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molten metal level measuring method for a twin belt type continuous casting machine, and more specifically, a twin belt type continuous casting machine equipped with a mold formed of a metal belt and a short side. The present invention relates to a method for measuring the molten metal level inside the mold.
【０００２】[0002]
【従来の技術】双ベルト式連続鋳造機は、鋳片の幅可変
を可能とする移動短辺を装備して構成される。ここで鋳
片の引抜き方向をｚ方向、金属ベルトの幅方向をｙ方向
と表現すると、操業の目的により鋳片の幅を変えるため
に短辺ｙ位置が鋳造中に変更されると、従来の湯面レベ
ル検出方法である特開平０４−２５８３５４号記載の方
法では、短辺ｙ位置の変更に対する対応が無い。2. Description of the Related Art A twin-belt type continuous casting machine is equipped with a movable short side that allows the width of a slab to be varied. If the drawing direction of the slab is expressed as the z direction and the width direction of the metal belt is expressed as the y direction, if the short side y position is changed during casting to change the width of the slab according to the purpose of operation, the conventional The method described in Japanese Patent Laid-Open No. 04-258354, which is a level detection method for a molten metal level, does not deal with a change in the y position of the short side.
【０００３】[0003]
【発明が解決しようとする課題】短辺ｙ位置の変更によ
り、導体である銅でできた短辺と金属ベルトとそれらで
囲まれた鋳造空間の溶鋼で形成される計測対象磁場が変
化し、湯面レベルセンサは短辺近傍に固定設置されてい
るので、湯面レベルが変化していないにも係わらず湯面
レベルセンサの出力電圧が変化して、安定した湯面レベ
ルの計測は不可能であり、鋳造を中断して湯面レベルセ
ンサを鋳造幅に合った校正関数に変更設定して鋳造を再
開していた。鋳造の中断は双ベルト式連続鋳造機の設備
稼働効率を下げ、製品歩留りを悪くする。By changing the position of the short side y, the magnetic field to be measured formed by the short side made of copper which is the conductor, the metal belt and the molten steel in the casting space surrounded by them changes, Since the molten metal level sensor is fixedly installed near the short side, the output voltage of the molten metal level sensor changes even though the molten metal level does not change, and stable molten metal level measurement is impossible. Therefore, the casting was interrupted, the level sensor of the molten metal was changed to a calibration function suitable for the casting width, and the casting was restarted. The interruption of casting lowers the equipment operation efficiency of the twin-belt continuous casting machine and deteriorates the product yield.
【０００４】本発明は、操業の目的によって鋳造中に鋳
片の幅が変更されて、固定設置された湯面レベルセンサ
に対して短辺ｙ位置が変化した場合にも、鋳造を中断す
ることなく速やかに、自動的に安定かつ正確な湯面レベ
ル計測を継続することを目的とする。According to the present invention, even if the width of the slab is changed during casting depending on the purpose of operation, and the position of the short side y with respect to the fixed surface level sensor is changed, the casting is interrupted. The purpose is to continue stable and accurate level measurement automatically and promptly.
【０００５】[0005]
【課題を解決するための手段】本発明は、溶融金属を保
持するための間隙を維持しつつ循環する１対のｘ方向に
対向配置した金属ベルトと、これら金属ベルト相互間の
両側縁部に位置させた１対のｙ方向に対向配置した短辺
と、これらで囲まれる鋳造空間に溶鋼を注入する注湯ノ
ズルとを備える双ベルト式連続鋳造機の、前記短辺位置
近傍に前記金属ベルトを介して前記鋳造空間を挟む形
で、送信コイルと受信コイルを対にし、縦方向ｚに複数
対を設置した電磁誘導を応用した湯面レベルセンサで、
前記鋳造空間の湯面レベルを形測する、双ベルト式連続
鋳造機の湯面レベル計測方法において、予め前記短辺の
ｙ位置毎の、湯面レベルセンサの出力電圧を湯面レベル
信号に変換する校正関数を作成しておき、短辺ｙ位置が
操業の目的により鋳造中に変更された場合、短辺ｙ位置
の変更信号を受けて、湯面レベルセンサの校正関数を、
短辺ｙ位置に対応した校正関数に切り替えて湯面レベル
センサの出力電圧を湯面レベル信号に変換することを特
徴とする。SUMMARY OF THE INVENTION According to the present invention, there are provided a pair of metal belts opposed to each other in the x direction, which circulate while maintaining a gap for holding a molten metal, and both side edges between the metal belts. The metal belt in the vicinity of the position of the short side of a twin belt type continuous casting machine including a pair of positioned short sides facing each other in the y direction and a pouring nozzle for injecting molten steel into a casting space surrounded by these. With the molten metal level sensor applying electromagnetic induction, the transmitter coil and the receiver coil are paired with a plurality of pairs installed in the vertical direction z with the casting space interposed therebetween.
A method of measuring a molten metal level of a casting space, comprising measuring a molten metal level of a twin-belt type continuous casting machine, wherein an output voltage of a molten metal level sensor for each y position of the short side is converted into a molten metal level signal in advance. If the short side y position is changed during casting due to the purpose of operation, the short side y position change signal is received, and the calibration function of the melt level sensor is
It is characterized in that the output voltage of the melt level sensor is converted into a melt level signal by switching to a calibration function corresponding to the position of the short side y.
【０００６】[0006]
【作用】薄肉鋼板を連続鋳造する双ベルト式連続鋳造機
の湯面レベルの計測は、短辺近傍に金属ベルトを挟む形
で縦方向に複数の送信コイルと受信コイルを対に設置し
た湯面レベルセンサで鋳型内部の溶鋼レベルを検出し計
測する。さらに詳細に説明すると、発信器から一定の計
測周波数で振幅が一定の電流を送信コイルに提供すると
送信コイルはその電流値に応じた一定周波数の磁束を発
生する。この磁束は対向する１対の金属ベルトの一方，
溶鋼および他方の金属ベルトを貫通して、溶鋼レベルに
対応した強さになって受信コイルに到達する。そして受
信コイルは、この磁束の強さに対応した誘導電圧を発生
する。またこの誘導電圧は溶鋼レベルに対応したものと
なり、溶鋼レベルの変化に対応して変化する。鋳型内部
の溶鋼レベルが上昇すると、送信コイルより発生する磁
束は溶鋼によって阻まれて弱くなり、受信コイルの誘導
電圧は小さくなる。Function: The twin-belt continuous casting machine that continuously casts thin steel plates is used to measure the level of the molten metal surface by placing a plurality of transmitting coils and receiving coils in pairs in the vertical direction with the metal belt sandwiched near the short side. The level sensor detects and measures the molten steel level inside the mold. More specifically, when the transmitter supplies a current having a constant amplitude and a constant amplitude to the transmitter coil, the transmitter coil generates a magnetic flux having a constant frequency according to the current value. This magnetic flux is one of a pair of metal belts facing each other,
It penetrates the molten steel and the other metal belt to reach the receiving coil with a strength corresponding to the molten steel level. Then, the receiving coil generates an induced voltage corresponding to the strength of this magnetic flux. Further, this induced voltage corresponds to the molten steel level, and changes according to the change in the molten steel level. When the molten steel level inside the mold rises, the magnetic flux generated from the transmitting coil is blocked by the molten steel and weakens, and the induced voltage in the receiving coil becomes smaller.
【０００７】受信コイルの誘導電圧は、バンドパスフィ
ルタで現場環境から発するノイズの除去を行い、計測周
波数近傍のみの信号とし、位相検波器に送られる。位相
検波器は、移相器により所定角度だけ位相をずらした発
信器からの電流によって同期をとり、バンドパスフィル
タからの信号を湯面レベルに対応した直流電圧に変換し
てローパスフィルタで交流ノイズの除去を行い、湯面レ
ベルセンサ出力電圧としてレベル変換用計算機すなわち
レベル演算器へ送る。レベル変換用計算機は、予め定め
た校正関数を用いて湯面レベルセンサ出力電圧を湯面レ
ベル信号に変換して出力する。The induced voltage in the receiving coil is sent to the phase detector as a signal only in the vicinity of the measurement frequency after removing the noise generated from the site environment by a bandpass filter. The phase detector synchronizes with the current from the oscillator whose phase is shifted by a predetermined angle by the phase shifter, converts the signal from the bandpass filter into a DC voltage corresponding to the molten metal level, and uses an AC noise with the lowpass filter. Is removed and sent to the level conversion computer, that is, the level calculator as the molten metal level sensor output voltage. The level conversion computer converts the molten metal level sensor output voltage into a molten metal level signal by using a predetermined calibration function and outputs it.
【０００８】さらに、送信コイルと受信コイル（センサ
対）を複数対有する湯面レベルセンサから湯面レベル信
号を得る校正関数について詳述する。最下段のセンサ対
からの各センサ対の通し番号を添字ｉとして定める。湯
面レベルセンサの出力電圧を湯面レベル信号に変換する
のに、次のアルゴリズムを用いる。Further, the calibration function for obtaining the molten metal level signal from the molten metal level sensor having a plurality of transmitting coils and receiving coils (sensor pairs) will be described in detail. The serial number of each sensor pair from the bottommost sensor pair is defined as a subscript i. The following algorithm is used to convert the output voltage of the melt level sensor into a melt level signal.
【０００９】センサ対のそれぞれにつき、オフライン
にて、模擬溶鋼の上端位置に対する湯面レベセンサ出力
電圧の特性を計測し、これを関数近似する。For each sensor pair, the characteristics of the molten metal level sensor output voltage with respect to the upper end position of the simulated molten steel are measured off-line, and this is approximated by a function.
【００１０】オンラインにて、湯面レベルの位置にあ
るセンサ対ｉの出力電圧を、で求めた校正関数を用い
て、湯面レベルに変換する。Online, the output voltage of the sensor pair i located at the level of the molten metal level is converted into the molten metal level using the calibration function obtained in.
【００１１】前記の、模擬溶鋼上端位置に対するセン
サ対ｉの出力電圧の特性を近似するのに、 Ｖi＝Ａi／｛１＋ｅｘｐ（（Ｌi−ｂi）／ａi）｝・・・（１） を用いる。ここで、Ｖiはセンサ対ｉの出力電圧
［Ｖ］、Ｌiは湯面レベル［ｍｍ］、Ａiはセンサ対ｉの
最大出力電圧［Ｖ］、ａiは傾きパラメータ［ｍｍ］、
ｂiはＡi／２となるレベル［ｍｍ］、である。（１）式
での未知数はａiとｂiであり、これを近似するのに
（１）式を変換した、 Ｌi＝ａi・ｌｏｇ（Ａi／Ｖi−１）＋ｂi ・・・（２） を用い、オフラインにて得られた模擬溶鋼上端位置とそ
のときのセンサ対ｉの出力電圧よりａi，ｂiを最小２乗
法を用いて算出し、算出値を（２）式に代入した校正関
数を予め求めておく。To approximate the characteristic of the output voltage of the sensor pair i with respect to the simulated molten steel upper end position, V i = A i / {1 + exp ((Li-b i ) / a i )} (1 ) Is used. Here, V i is the output voltage [V] of the sensor pair i, Li is the molten metal level [mm], A i is the maximum output voltage [V] of the sensor pair i, a i is the tilt parameter [mm],
b i is a level [mm] at which A i / 2 is obtained. The unknowns in the formula (1) are a i and b i , and the formula (1) is converted to approximate them. Li = a i · log (A i / V i −1) + b i ... Using (2), ai and b i are calculated from the simulated molten steel upper end position obtained off-line and the output voltage of the sensor pair i at that time using the method of least squares, and the calculated value is expressed by equation (2). The substituted calibration function is obtained in advance.
【００１２】前記のオンラインでの湯面レベル変換ア
ルゴリズムは、複数のセンサ対でなる湯面レベルセンサ
の、最上段のセンサ対から、順次下段のセンサ対につい
て、それらの出力電圧Ｖiが、 Ｖi≧０．５［Ｖ］ ・・・（３） であるかをチェックして、今回採用するセンサ対を選択
する。すなわち、まず最上段のセンサ対の出力電圧が
（３）式を満すかをチェックして、（３）式を満してお
れば、最上段のセンサ対を測定に用い、その出力電圧
を、そのときの短辺ｙ位置対応の校正関数で湯面レベル
に変換する。最上段のセンサ対の出力電圧が(3)式を満
していないときには、その下のセンサ対が（３）式を満
しているかをチェックする。以下同様である。According to the above-described online level conversion algorithm, the output voltage Vi of each of the upper level sensor pair and the lower level sensor pair of the level sensor composed of a plurality of sensor pairs is V i. It is checked whether ≧ 0.5 [V] (3) and the sensor pair to be adopted this time is selected. That is, first, it is checked whether the output voltage of the uppermost sensor pair satisfies the expression (3). If the output voltage of the uppermost sensor pair is satisfied, the uppermost sensor pair is used for measurement, and the output voltage is At that time, it is converted into the molten metal level by the calibration function corresponding to the position of the short side y. When the output voltage of the uppermost sensor pair does not satisfy the equation (3), it is checked whether the sensor pair below it satisfies the equation (3). The same applies hereinafter.
【００１３】このようにして、複数のセンサ対でなる湯
面レベルセンサを用いて広範囲の計測レンジを高速応答
にて湯面レベルの変化を検出し計測する。In this way, the change in the molten metal level is detected and measured in a wide range of measurement range with high speed response by using the molten metal level sensor composed of a plurality of sensor pairs.
【００１４】図３に、短辺ｙ位置の変化による１つのセ
ンサ対の出力電圧の特性の例を示す。湯面レベル計測範
囲は図の横軸で約２００ｍｍから３５０ｍｍの範囲であ
る。黒丸印は短辺と湯面レベルセンサ側面との間隔が１
００ｍｍの場合であり、黒４角印は短辺と湯面レベルセ
ンサ側面との間隔が５０ｍｍの場合である。図３に示す
様に、湯面レベルセンサ出力電圧は、操業の目的により
鋳片の幅を変えるために短辺ｙ位置が鋳造中に変更され
ると、導体である銅でできた短辺，金属ベルトおよび溶
鋼による各センサ対に対する磁場が変化し、短辺位置近
傍に固定設置された各センサ対はその影響を受けて、湯
面レベルが変化していないにも係わらず湯面レベルセン
サの出力電圧は変化する。FIG. 3 shows an example of the characteristics of the output voltage of one sensor pair due to the change in the position of the short side y. The molten metal level measurement range is a range of about 200 mm to 350 mm on the horizontal axis of the figure. The black circle indicates the distance between the short side and the side of the bath level sensor is 1
In the case of 00 mm, the black square mark represents the case where the distance between the short side and the side surface of the molten metal level sensor is 50 mm. As shown in FIG. 3, when the position of the short side y is changed during casting in order to change the width of the slab according to the purpose of operation, the molten surface level sensor output voltage is short side made of copper, which is a conductor, The magnetic field for each sensor pair due to the metal belt and molten steel changes, and each sensor pair fixedly installed near the short side position is affected by this, and the level of the level sensor does not change even though the level does not change. The output voltage changes.
【００１５】そこで本発明は、オフラインで鋳片の幅の
仕様に従って短辺の設定ｙ位置を分類しておき、前記
の手順にてこの分類された短辺の設定ｙ位置毎に対応し
た湯面レベルセンサ（センサ対のそれぞれ）の校正関数
を作成してレベル変換用計算機内に記憶しておく。Therefore, according to the present invention, the set y positions of the short sides are classified off-line according to the specification of the width of the slab, and the molten metal surface corresponding to each of the classified set y positions of the short sides in the above procedure. A calibration function for the level sensor (each sensor pair) is created and stored in the level conversion computer.
【００１６】つぎにオンラインでの湯面レベル計測にお
いて、鋳片の幅が操業の目的により変更された場合に、
湯面レベルセンサの出力電圧を湯面レベルに変換する時
に用いる校正関数を、短辺位置の変更信号により、今回
の短辺設定ｙ位置に対応する校正関数に切換え、この校
正関数を用いて湯面レベルセンサ（選択したセンサ対）
の出力電圧を湯面レベルに変換する。Next, in the online surface level measurement, when the width of the slab is changed depending on the purpose of operation,
The calibration function used when converting the output voltage of the molten metal level sensor to the molten metal level is switched to the calibration function corresponding to the short side setting y position this time by the short side position change signal, and this calibration function is used. Surface level sensor (selected sensor pair)
The output voltage of is converted into the molten metal level.
【００１７】このように、鋳片の幅変更が行われる毎
に、短辺位置の変更信号により、変更のタイミングに合
わせ新たな短辺ｙ位置の分類に対応した校正関数に切り
替えて出力電圧／湯面レベル変換に使用することによ
り、実湯面レベルに一致した湯面レベル計測が行われ、
連続的かつ正確な湯面レベルの計測が可能となる。鋳造
中に幅変更が行われた場合にも、正確な湯面レベルが得
られ、これを用いたレベル制御により、湯面レベルが所
要値に安定して維持される。As described above, every time the width of the slab is changed, the short side position change signal is switched to the calibration function corresponding to the new short side y position classification according to the change timing, and the output voltage / By using it for level conversion, the level of the level of metal that matches the actual level is measured.
It enables continuous and accurate measurement of the molten metal level. Even if the width is changed during casting, an accurate molten metal level is obtained, and the level control using this allows the molten metal level to be stably maintained at the required value.
【００１８】[0018]
【実施例】図１は薄肉鋼板を連続鋳造する双ベルト式連
続鋳造機の鋳片の幅可変の例を示す図である。図２は、
本発明を実施する湯面レベルセンサの１つのセンサ対の
構成と信号処理装置を示すブロック図である。以下本発
明の実施例を、図１および図２に基づいて詳述する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing an example of varying the width of a slab of a twin belt type continuous casting machine for continuously casting thin steel plates. Figure 2
It is a block diagram which shows the structure of one sensor pair of a molten metal level sensor which implements this invention, and a signal processing apparatus. Embodiments of the present invention will be described in detail below with reference to FIGS. 1 and 2.
【００１９】間隙を維持しつつ循環する１対の対向配置
にした金属ベルト７と、これら金属ベルト７相互間の両
側縁部に位置する１対の短辺１，２とで形成した鋳造空
間（以後、鋳型と言う）に、注湯ノズル３から溶鋼６が
注湯され、溶鋼６は金属ベルト７で冷却されながら下方
に移動し、これにより薄肉鋼板が連続的に鋳造される。A casting space formed by a pair of opposed metal belts 7 that circulate while maintaining a gap, and a pair of short sides 1 and 2 located on both side edges between these metal belts 7 ( Hereinafter, the molten steel 6 is poured into the casting mold) from the pouring nozzle 3, and the molten steel 6 moves downward while being cooled by the metal belt 7, whereby thin steel plates are continuously cast.
【００２０】短辺１，２位置近傍に金属ベルト７を挟む
形で縦方向ｚにセンサ対４，５が設置され、各センサ対
が湯面レベルに対応した誘導電圧を、各センサ対の受信
コイル（９）に発生する。以下、センサ対４に関して説
明する。受信コイル９が発生した誘導電圧に含まれる、
現場環境から発するノイズをバンドパスフィルタ１０が
除去して、計測周波数（発信器１３が発生する交流の周
波数）近傍のみを摘出して位相検波器１１に送る。位相
検波器１１は、移相器１４が発生する、発信器１３から
の交流を所定角度だけ位相をずらした交流信号に同期を
とり、バンドパスフィルタ１０からの信号を湯面レベル
に対応した直流電圧に変換する。ローパスフィルタ１２
がこの直流電圧の交流ノイズを除去し、センサ対４の出
力電圧としてレベル演算器（レベル変換用計算機）１５
へ送る。Sensor pairs 4 and 5 are installed in the vertical direction z in the vicinity of positions 1 and 2 of the short sides so as to sandwich the metal belt 7, and each sensor pair receives an induced voltage corresponding to the molten metal level of each sensor pair. It occurs in the coil (9). The sensor pair 4 will be described below. Included in the induced voltage generated by the receiving coil 9,
The bandpass filter 10 removes the noise generated from the site environment, extracts only the vicinity of the measurement frequency (the frequency of the alternating current generated by the oscillator 13), and sends it to the phase detector 11. The phase detector 11 synchronizes the alternating current signal from the oscillator 13 generated by the phase shifter 14 with a phase shifted by a predetermined angle and synchronizes the signal from the bandpass filter 10 with a direct current corresponding to the molten metal level. Convert to voltage. Low pass filter 12
Removes the AC noise of this DC voltage and outputs the output voltage of the sensor pair 4 as a level calculator (level conversion calculator) 15
Send to.
【００２１】レベル演算器１５には、前記湯面レベル変
換アルゴリズムに従い、短辺１，２のｙ位置の変更に
よる計測対象磁場の変化に対応するために、予めオフラ
インで鋳片６の幅の仕様に従って短辺１，２の設定ｙ位
置を分類して、この分類された短辺１，２の設定ｙ位置
に対応した校正関数をファイルＷ1〜Ｗnに記憶してい
る。In accordance with the above-mentioned level conversion algorithm of the molten metal level, the level calculator 15 is offline in advance to specify the width of the slab 6 in order to respond to the change of the magnetic field to be measured by changing the y position of the short sides 1 and 2. The set y positions of the short sides 1 and 2 are classified in accordance with the above, and the calibration functions corresponding to the classified set y positions of the short sides 1 and 2 are stored in the files W 1 to W n .
【００２２】鋳片６の幅が操業の目的により変更された
場合に、短辺位置の変更信号（変更後の短辺ｙ位置を表
わす信号）がレベル演算器１５に、前の信号（変更前の
短辺ｙ位置を表わす信号）に代えて与えられ、この変更
信号に対応してレベル演算器１５は、センサ対４の出力
電圧を湯面レベル信号に変換する時に用いる校正関数
を、変更後の短辺ｙ位置に対応するもの（Ｗ1〜Ｗnの１
つ）に切換え、以下、更に変更信号が到来するまで、該
切換えた校正関数に基づいて、センサ対４の出力電圧を
湯面レベル信号に変換し、出力する。When the width of the slab 6 is changed according to the purpose of operation, a signal for changing the position of the short side (a signal indicating the changed y position of the short side) is sent to the level calculator 15 and the previous signal (before the change). Of the short side y position of the sensor side 4), and the level calculator 15 responds to this change signal by changing the calibration function used when converting the output voltage of the sensor pair 4 into a molten metal level signal. Corresponding to the short side y position of ( 1 of W 1 to W n
Then, until the change signal arrives, the output voltage of the sensor pair 4 is converted into the molten metal level signal based on the switched calibration function and output.
【００２３】なお、短辺位置の変更信号は、図示してい
ない短辺駆動装置が発生し、短辺位置設定装置を介して
レベル演算器１５に与えられる。The short side position change signal is generated by a short side driving device (not shown) and is given to the level calculator 15 via the short side position setting device.
【００２４】１つのセンサ対４とそれに接続されたレベ
ル演算器１５が一単位となっており、図１に示すもう１
つのセンサ対５にも、図示は省略したが、レベル演算器
１５と同様なもう１つのレベル演算器が接続されて、セ
ンサ対５と共にもう一単位となっている。図示は省略し
たが、湯面レベルセンサは、これら二単位と、高い出力
電圧を発生しているセンサ対（４と５の一方）に接続さ
れたレベル演算器の湯面レベル信号を選択して出力する
計測コントロ−ラを含むものである。３以上のセンサ対
を用いる場合には、計測コントロ−ラは、最上段のセン
サ対の出力電圧から順次に下段のセンサ対の出力電圧
を、それが０．５［Ｖ］以上であるかをチェックして、
０．５［Ｖ］以上の出力電圧のセンサ対を目下の計測用
のセンサ対として選択しそれに接続されたレベル演算器
の湯面レベル信号を選択して出力する。One sensor pair 4 and the level calculator 15 connected to it constitute one unit, and the other one shown in FIG.
Although not shown, one sensor pair 5 is also connected with another level calculator similar to the level calculator 15 to form another unit together with the sensor pair 5. Although not shown in the figure, the melt level sensor selects these two units and the melt level signal of the level calculator connected to the sensor pair (one of 4 and 5) generating a high output voltage. It includes a measurement controller for output. When using three or more sensor pairs, the measurement controller sequentially determines the output voltage of the sensor pair in the lower stage from the output voltage of the sensor pair in the uppermost stage, whether it is 0.5 [V] or more. Check,
A sensor pair having an output voltage of 0.5 [V] or more is selected as the current measurement sensor pair, and the molten metal level signal of the level calculator connected thereto is selected and output.
【００２５】[0025]
【発明の効果】以上詳述した本発明方法を用いることに
より、短辺ｙ位置が操業の目的により鋳造中に変更され
た場合でも鋳型内の湯面レベルの安定した計測が実現で
き双ベルト式連続鋳造機の製品品質の向上に寄与出来る
等、本発明は優れた効果を発揮する。By using the method of the present invention described in detail above, stable measurement of the molten metal level in the mold can be realized even when the short side y position is changed during casting for the purpose of operation. The present invention exerts excellent effects such as contributing to improvement of product quality of a continuous casting machine.
【図１】 薄肉鋼板を連続鋳造する双ベルト式連続鋳造
機の縦断面の概要を示す断面図である。FIG. 1 is a sectional view showing an outline of a vertical section of a twin-belt type continuous casting machine for continuously casting a thin steel plate.
【図２】 図１に示すセンサ対４の構成を示すブロック
図であり、双ベルト式連続鋳造機の横断面の概要をも示
す。2 is a block diagram showing a configuration of a sensor pair 4 shown in FIG. 1, and also shows an outline of a cross section of a twin-belt type continuous casting machine.
【図３】 図１に示す短辺１，２のｙ位置の変化による
センサ対４の出力電圧の変化を示すグラフであり、これ
は鋳型空間に鋼片を置いてこれを溶鋼と模擬して得たも
のである。3 is a graph showing a change in output voltage of the sensor pair 4 due to a change in y position of the short sides 1 and 2 shown in FIG. 1, which is obtained by placing a steel piece in a mold space and simulating it as molten steel. That is what I got.
１,２：短辺 ３：注湯ノズル ４,５：センサ対 ６：溶鋼 ７：金属ベルト ８：送信コイル ９：受信コイル １０：バンドパスフィ
ルタ １１：位相検波器 １２：ローパスフィ
ルタ １３：発信器 １４：移相器 １５：レベル変換用計算機 ２４：電力制御部 ２５：流量制御部1, 2: Short side 3: Pouring nozzle 4, 5: Sensor pair 6: Molten steel 7: Metal belt 8: Transmission coil 9: Reception coil 10: Bandpass filter 11: Phase detector 12: Lowpass filter 13: Transmitter 14: Phase shifter 15: Level conversion computer 24: Electric power control unit 25: Flow control unit
Claims (1)
つつ循環する１対のｘ方向に対向配置した金属ベルト
と、これら金属ベルト相互間の両側縁部に位置させた１
対のｙ方向に対向配置した短辺と、これらで囲まれる鋳
造空間に溶鋼を注入する注湯ノズルとを備える双ベルト
式連続鋳造機の、前記短辺位置近傍に前記金属ベルトを
介して前記鋳造空間を挟む形で、送信コイルと受信コイ
ルを対にし、縦方向ｚに複数対を設置した電磁誘導を応
用した湯面レベルセンサで、前記鋳造空間の湯面レベル
を形測する、双ベルト式連続鋳造機の湯面レベル計測方
法において、 予め前記短辺のｙ位置毎の、湯面レベルセンサの出力電
圧を湯面レベル信号に変換する校正関数を作成してお
き、短辺ｙ位置が操業の目的により鋳造中に変更された
場合、短辺ｙ位置の変更信号を受けて、湯面レベルセン
サの校正関数を、短辺ｙ位置に対応した校正関数に切り
替えて湯面レベルセンサの出力電圧を湯面レベル信号に
変換することを特徴とする、双ベルト式連続鋳造機の湯
面レベル計測方法。1. A pair of metal belts arranged to face each other in the x direction, which circulate while maintaining a gap for holding a molten metal, and a pair of metal belts located on both side edges between the metal belts.
In a twin-belt continuous casting machine including a pair of short sides arranged to face each other in the y direction and a pouring nozzle for injecting molten steel into a casting space surrounded by these, the metal belt is provided in the vicinity of the short side. A twin-belt for measuring the level of the molten metal in the casting space with a molten metal level sensor that applies electromagnetic induction in which a plurality of pairs of transmitting coils and receiving coils are installed in the casting space and a plurality of pairs are installed in the vertical direction z. In the method for measuring the molten metal level of a continuous casting machine, a calibration function for converting the output voltage of the molten metal level sensor into a molten metal level signal is created in advance for each y position of the above-mentioned short side, When it is changed during casting due to the purpose of operation, it receives the change signal of the short side y position and switches the calibration function of the melt level sensor to the calibration function corresponding to the y position of the short side to output the melt level sensor. Converts the voltage into a level signal A method for measuring a molten metal level of a twin-belt continuous casting machine, which is characterized in that
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6207572A JPH0868682A (en) | 1994-08-31 | 1994-08-31 | Molten metal level measuring method for twin belt continuous casting machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6207572A JPH0868682A (en) | 1994-08-31 | 1994-08-31 | Molten metal level measuring method for twin belt continuous casting machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0868682A true JPH0868682A (en) | 1996-03-12 |
Family
ID=16541979
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6207572A Withdrawn JPH0868682A (en) | 1994-08-31 | 1994-08-31 | Molten metal level measuring method for twin belt continuous casting machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0868682A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000040403A (en) * | 1998-12-18 | 2000-07-05 | 이구택 | Method for measuring level of molten metal within mold for electromagnetic successive cast process |
| JP2013166167A (en) * | 2012-02-15 | 2013-08-29 | Nippon Steel & Sumitomo Metal Corp | Method for measuring molten metal surface level in continuous casting mold |
-
1994
- 1994-08-31 JP JP6207572A patent/JPH0868682A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000040403A (en) * | 1998-12-18 | 2000-07-05 | 이구택 | Method for measuring level of molten metal within mold for electromagnetic successive cast process |
| JP2013166167A (en) * | 2012-02-15 | 2013-08-29 | Nippon Steel & Sumitomo Metal Corp | Method for measuring molten metal surface level in continuous casting mold |
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