JP3138953B2 - Slag thickness measuring device - Google Patents
Slag thickness measuring deviceInfo
- Publication number
- JP3138953B2 JP3138953B2 JP07107759A JP10775995A JP3138953B2 JP 3138953 B2 JP3138953 B2 JP 3138953B2 JP 07107759 A JP07107759 A JP 07107759A JP 10775995 A JP10775995 A JP 10775995A JP 3138953 B2 JP3138953 B2 JP 3138953B2
- Authority
- JP
- Japan
- Prior art keywords
- slag
- molten metal
- interface
- detecting
- probe
- 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
Description
【０００１】[0001]
【産業上の利用分野】本発明は溶融金属上面に位置する
スラグ（特に取鍋やトピード中の溶鋼や溶銑の上面に位
置するスラグ）厚を測定する装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for measuring the thickness of slag located on the upper surface of a molten metal (especially slag located on the upper surface of molten steel or hot metal in a ladle or torpedo).
【０００２】[0002]
【従来の技術】従来溶融金属の上面に位置するスラグ厚
を測定する装置として種々の発明が成されている。例え
ば第１に棒状の２本の界面検知用電極を用い電極間の抵
抗を検知しスラグ厚を測定するものがある。第２に磁界
発生コイルを用いて高周波磁界を発生させつつ前記コイ
ルのインピーダンスを検出する。そして該検出インピー
ダンスをインダクタンスと抵抗とに分離し該インダクタ
ンスから溶湯レベルを測定しその測定した溶湯レベル及
び前記抵抗から溶融スラグ厚を求めるものがある。第３
に非接触型スラグ溶融金属界面検知用センサー２個を縦
方向に距離を置いて配置し一方のものでスラグ溶融金属
界面を他方のもので雰囲気スラグ界面を検知してスラグ
厚を測定する装置がある。しかし従来の方法の電極によ
る検知では各電極間の抵抗の変化によって測定するもの
であるためスラグは測定毎に性状や温度が一定ではな
く、従って前記抵抗も一定ではない。即ちスラグの抵抗
が低すぎる場合には抵抗のほとんどない溶融金属との区
別ができないために正確なスラグ厚を測定できないとい
った問題がある。一方磁界発生コイルを用いる場合には
検出インピーダンスをインダクタンスと抵抗とに分離し
て抵抗から雰囲気スラグ界面を測定するのであることか
ら前記と同様抵抗値の低いスラグの場合にはインダクタ
ンスと抵抗の分離はできずインダクタンスしかとれない
ことがある。即ち雰囲気スラグ界面の検知ができないと
いった問題がある。次に非接触型の感知器も前記磁界発
生コイルと同様に磁束の変化に基づき検知するものであ
るためスラグ中では溶鋼中に比べ磁束の透過率が小さく
空気中にもほとんど磁束がないため感知器を空気中から
スラグに向けて降下していっても雰囲気スラグ界面を検
知できない場合がある。更に棒状電極を用いた場合には
雰囲気スラグ界面をいわゆる点でとらえるため確実に界
面をキャッチ出来ず又異なる長さの２本の電極を用いた
ものではその長さの違いが測定値の誤差となり、正確な
測定がないといった問題がある。2. Description of the Related Art Conventionally, various inventions have been made as devices for measuring the thickness of a slag located on the upper surface of a molten metal. For example, first, there is a method in which the slag thickness is measured by detecting the resistance between two electrodes using two rod-shaped interface detection electrodes. Second, the impedance of the coil is detected while generating a high-frequency magnetic field using the magnetic field generating coil. There is a method in which the detected impedance is separated into an inductance and a resistance, a molten metal level is measured from the inductance, and a molten slag thickness is obtained from the measured molten metal level and the resistance. Third
A device for measuring the slag thickness by arranging two sensors for non-contact type slag molten metal interface detection at a distance in the vertical direction and detecting the slag molten metal interface with one and the atmosphere slag interface with the other. is there. However, in the detection by the electrodes in the conventional method, the properties and temperature of the slag are not constant at each measurement because the measurement is performed by the change in resistance between the electrodes, and thus the resistance is not constant. That is, when the resistance of the slag is too low, there is a problem that the slag thickness cannot be accurately measured because it cannot be distinguished from the molten metal having almost no resistance. On the other hand, when a magnetic field generating coil is used, the detection impedance is separated into an inductance and a resistance, and the interface between the atmosphere and the slag is measured from the resistance. In some cases, only inductance can be obtained. That is, there is a problem that the interface of the atmosphere slag cannot be detected. Next, since the non-contact type sensor also detects the change based on the change of the magnetic flux similarly to the magnetic field generation coil, the magnetic flux transmittance is smaller in the slag than in the molten steel, and there is almost no magnetic flux in the air. Even if the vessel is lowered from the air toward the slag, the interface of the atmosphere slag may not be detected. Furthermore, when a rod-shaped electrode is used, the interface between the atmosphere and the slag cannot be reliably detected because the interface of the slag is captured at a so-called point. In the case of using two electrodes of different lengths, the difference in the length causes an error in the measured value. There is a problem that there is no accurate measurement.
【０００３】[0003]
【発明が解決しようとする課題】本発明は磁界発生コイ
ルと電極のそれぞれの特性を有効に使いより正確なスラ
グ厚を迅速に測定することを目的とする。SUMMARY OF THE INVENTION It is an object of the present invention to effectively measure the characteristics of a magnetic field generating coil and an electrode to quickly measure a more accurate slag thickness.
【０００４】[0004]
【課題を解決するための手段】本発明は以上の目的達成
のために溶融金属温度測定素子保護用キャップを兼ねた
雰囲気スラグ界面検知用電極と、磁界の変動による共振
状態の変化を検知するスラグ溶融金属界面検知用センサ
ーを有し、前記スラグ溶融金属界面検知用センサーがプ
ローブ内に配置されたことを特徴とするスラグ厚測定装
置提案するものである。SUMMARY OF THE INVENTION In order to achieve the above objects, the present invention provides an electrode for detecting an interface of an atmosphere slag which also serves as a cap for protecting a molten metal temperature measuring element, and a slag for detecting a change in a resonance state due to a change in a magnetic field. The present invention provides a slag thickness measuring device having a sensor for detecting a molten metal interface, wherein the sensor for detecting a slag molten metal interface is disposed in a probe.
【０００５】[0005]
【実施例】以下本発明のスラグ厚測定装置を図面に示す
実施例に従い説明する。図１は本発明の装置を示し、該
装置はスラグ溶融金属界面検知用センサー（３）がプロ
ーブ（１）を昇降させるランス（２）のホルダー（２
ａ）に収納されている。すなわちホルダー（２ａ）に接
続されたプローブ（１）は溶融金属試料採取用のサンプ
ル容器（４）及び溶融金属温度測定素子（５）を備えて
いる。雰囲気スラグ界面検知用電極（６）は溶融金属温
度測定素子保護用キャップの機能を有し前記ブローブ
（１）の先端に取り付けられる。ランス（２）の下降に
伴い該プローブ（１）も溶湯鍋（１１）に向けて下降さ
れる。溶湯鍋（１１）には当然溶融金属が入っているが
鍋（１１）内の状況はスラグ（７）が表面に浮遊しその
下部に溶融金属８が存在する。本発明はこのスラグ
（７）の厚みを測定するための装置であって前記ブロー
ブ（１）が下降すると該溶融金属温度測定素子保護用キ
ャップを兼ねる雰囲気スラグ界面検知用電極（６）がス
ラグ（７）にまず接触・浸漬される。溶融金属温度測定
素子保護用キャップを兼ねる雰囲気スラグ界面検知用電
極（６）がスラグ（７）の表面に接触すると同時に短絡
が確認された後続けてスラグ中を通過中に溶解される。DESCRIPTION OF THE PREFERRED EMBODIMENTS A slag thickness measuring apparatus according to the present invention will be described below with reference to an embodiment shown in the drawings. FIG. 1 shows an apparatus of the present invention. The apparatus includes a lance (2) holder (2) for raising and lowering a probe (1) by a sensor (3) for detecting a slag molten metal interface.
a). That is, the probe (1) connected to the holder (2a) includes a sample container (4) for collecting a molten metal sample and a molten metal temperature measuring element (5). The atmosphere slag interface detection electrode (6) has a function of a cap for protecting the molten metal temperature measuring element, and is attached to the tip of the probe (1). With the lowering of the lance (2), the probe (1) is also lowered toward the melting pot (11). The molten metal is naturally contained in the molten metal pot (11), but the state in the molten metal pot (11) is such that the slag (7) floats on the surface and the molten metal 8 exists below the molten metal. The present invention is an apparatus for measuring the thickness of the slag (7), and when the probe (1) is lowered, the electrode (6) for detecting the interface of the atmosphere slag which also serves as a cap for protecting the molten metal temperature measuring element is provided. 7) First, contact and dipping are performed. Atmospheric slag interface detecting electrode (6), which also serves as a cap for protecting the molten metal temperature measuring element, comes into contact with the surface of slag (7), and at the same time, after a short circuit is confirmed, it is melted while passing through the slag.
【０００６】すなわち、雰囲気スラグ界面検知用電極
（６）の検出回路は第３図に示すように直流電源、基準
電圧用抵抗器、前記電極（６）への出力電流制限抵抗、
スラグ表面検出出力機能を有する比較器（１６）、外部
機器駆動回路（１９）より構成されており、比較器（１
６）の動作条件は基準電圧よりもスラグに電流が流れる
時に生じる電位差が小さいことが条件であり、Ｖａ＞Ｖ
ｂであることが条件である。スラグ表面検出電極がスラ
グに接触していない状態ではＢ点には電源電圧と同電位
の電圧が供給されている為、Ｖａ＜Ｖｂとなっている。
しかし、スラグ表面検出電極がスラグに接触するとスラ
グに電流が流れ、Ｂ点の電圧が小さくなるためＶａ＞Ｖ
ｂとなり比較器（１６）の動作により雰囲気スラグ界面
検知用電極（６）からの出力が行われる。また溶融金属
温度測定素子（５）が溶融金属中に達するまで雰囲気ス
ラグ界面検知用電極（６）は溶融金属温度測定素子
（５）を保護しているのである。更に短絡の信号は信号
ライン（１１）を伝わって演算器（９）にインプットさ
れる。次に下降を続けるとスラグ溶融金属界面検知用セ
ンサー（３）がスラグと溶融金属の界面位まで浸漬され
その位置が信号ライン（１２）を伝わって演算器（１
０）にインプットされる。That is, as shown in FIG. 3, a detection circuit for the electrode (6) for detecting the interface between the atmosphere and the slag includes a DC power supply, a resistor for a reference voltage, a resistance for limiting an output current to the electrode (6),
It comprises a comparator (16) having a slag surface detection output function and an external device drive circuit (19).
The operation condition 6) is that the potential difference generated when a current flows through the slag is smaller than the reference voltage, and Va> V
The condition is b. In a state where the slag surface detection electrode is not in contact with the slag, a voltage having the same potential as the power supply voltage is supplied to point B, so that Va <Vb.
However, when the slag surface detection electrode comes into contact with the slag, a current flows through the slag, and the voltage at point B decreases, so that Va> V
The output from the electrode (6) for detecting the interface between the atmosphere and the slag is performed by the operation of the comparator (16). Further, the electrode for detecting the interface of the atmosphere slag (6) protects the molten metal temperature measuring element (5) until the molten metal temperature measuring element (5) reaches the inside of the molten metal. Further, the short-circuit signal is input to the arithmetic unit (9) via the signal line (11). Next, when the descent is continued, the slag molten metal interface detection sensor (3) is immersed to the interface position between the slag and the molten metal, and the position is transmitted through the signal line (12) to the arithmetic unit (1).
0).
【０００７】すなわち、スラグ溶融金属界面検知用セン
サー（３）の検出回路は、ランスのホルダー（２ａ）に
内蔵した２組のコイル（図示せず）と検出器内に設けら
れた発信回路からなる。この発信回路はＬＣ並列発信回
路であり、発信回路はスラグ溶融金属界面検知用センサ
ー（３）が溶鋼に浸漬されていない状態の時、共振状態
を保ってバランスしている。しかし、溶鋼内にセンサー
（３）が浸漬されることで、共振状態のバランスが崩
れ、センサ両端の電圧が著しく変化するので、その変化
状態から溶鋼面レベルを検出するものである。尚前述の
如くランス（２）は下降しているからランスの高さを確
認しなければ正確なスラグの厚みは測定できない。そこ
でランス昇降装置（１３）の動きを信号ライン（１０）
により演算器（９）に伝達されることになる。ところ
が、ランスの測定位置は測定毎に上下動するため、一定
の測定位置を確保できない。そこで、プリセットリミッ
トスイッチ（１８）を設け、基準位置を設定し、信号ラ
イン１７を通して、入力することで前記信号（１０）と
合せて、確実な測定位置を算出できるものである。That is, the detection circuit of the slag molten metal interface detection sensor (3) includes two sets of coils (not shown) built in the lance holder (2a) and a transmission circuit provided in the detector. . This transmission circuit is an LC parallel transmission circuit, and the transmission circuit is balanced while maintaining the resonance state when the slag molten metal interface detection sensor (3) is not immersed in the molten steel. However, when the sensor (3) is immersed in the molten steel, the balance of the resonance state is lost, and the voltage at both ends of the sensor changes significantly. Therefore, the level of the molten steel surface is detected from the changed state. Since the lance (2) is lowered as described above, the exact slag thickness cannot be measured unless the height of the lance is confirmed. Then, the movement of the lance lifting device (13) is transferred to the signal line (10).
Is transmitted to the computing unit (9). However, since the measurement position of the lance moves up and down every measurement, a fixed measurement position cannot be secured. Therefore, by providing a preset limit switch (18), setting a reference position, and inputting it through the signal line 17, it is possible to calculate a reliable measurement position in combination with the signal (10).
【０００８】このようにスラグ面検知信号と湯面検知信
号とプローブ位置検出信号と基準位置信号が演算器
（９）に終結され所望するスラグ厚が出力されるのであ
る。一方前記スラグ溶融金属界面検知用センサー（３）
は磁界の変動を検出するものであって溶鋼内に位置しな
ければ測定できない。そこでランス（２）の先端に取り
付けられたホルダー（２ａ）内に取り付けられ、プロー
ブを介して測定時には常に溶融金属内に位置するのであ
る。また、図１に示される様にセンサーをランス（２）
に必ず取り付ける必要はない。図２に示すようにブロー
ブ（１）に設けた接点コネクター（１５）の一部にスラ
グ溶融金属界面検知用センサー（１４）を設けてもよ
い。これによりプローブの浸漬深さをかせぐ必要がなく
なり、すなわちランスの降下距離が短くてもプローブが
溶融金属に浸漬されればスラグ溶融金属界面検知用セン
サー（３）が素早くスラグ溶融金属界面に到達されるも
のである。また以上の実施例ではプローブに溶融余属温
度測定素子（５）及び溶融金属試料採取容器（４）を取
り付けていたが従来公知の各種センサーを取付けられる
ことはいうまでもない。As described above, the slag surface detection signal, the molten metal level detection signal, the probe position detection signal, and the reference position signal are terminated in the calculator (9), and the desired slag thickness is output. On the other hand, the slag molten metal interface detection sensor (3)
Is for detecting the fluctuation of the magnetic field and cannot be measured unless it is located in the molten steel. Therefore, it is mounted in the holder (2a) mounted on the tip of the lance (2), and is always located in the molten metal at the time of measurement via the probe. Also, as shown in FIG.
It is not always necessary to attach to As shown in FIG. 2, a sensor (14) for detecting a slag molten metal interface may be provided on a part of the contact connector (15) provided on the probe (1). As a result, it is not necessary to increase the immersion depth of the probe, that is, if the probe is immersed in the molten metal even if the lance descends a short distance, the slag molten metal interface detection sensor (3) can quickly reach the slag molten metal interface. Things. Further, in the above embodiment, the probe is provided with the element for measuring the temperature of the residual molten metal (5) and the container for collecting the sample of the molten metal (4). However, it goes without saying that conventionally known various sensors can be mounted.
【０００９】[0009]
【発明の効果】本願発明は以上に説明した通りであり雰
囲気スラグ界面検知用電極が溶融金属温度測定素子保護
用キャップと兼用しているので従来の棒状電極と比べ
「面」で検出するため測定対象である固体を含むスラグ
においても本来のスラグ面に「面」で接触するから検出
は正確である。また従来はスラグ面に流れる電流値の変
化からスラグ面を検出していたのに対して本件発明では
スラグ溶融金属界面検知用センサーが磁界の変動による
共振状態の変化を検知するため、従来では溶鋼側に電位
がある場合やスラグ自身の抵抗値が大きい場合にスラグ
面の検出が非常に困難になるが本件では溶鋼面の電位に
も影響されず、また、スラグの抵抗が１００ＫΩ程度と
なっても正常にスラグ面を検出できるものである。又前
記演算器にはプローブに内蔵された溶融金属温度測定素
子又は別途取り付け可能な各種成分センサー素子からの
信号を入力し同時に処理することも可能であり従来にな
い生産工程の短縮化が図れるものである。The present invention is as described above. Since the electrode for detecting the interface between the atmosphere and the slag also serves as the cap for protecting the molten metal temperature measuring element, it can be measured on the "surface" as compared with the conventional rod-shaped electrode. The detection is accurate even in the slag including the solid as the target, because the slag comes into contact with the original slag surface by “surface”. Conventionally, the slag surface was detected from the change in the current flowing through the slag surface, whereas in the present invention, the sensor for detecting the slag molten metal interface detects a change in the resonance state due to a change in the magnetic field. When there is a potential on the side or the resistance value of the slag itself is large, it is very difficult to detect the slag surface. However, in this case, the slag is not affected by the potential of the molten steel surface, and the slag resistance is about 100 KΩ. Can normally detect the slag surface. In addition, the arithmetic unit is capable of inputting signals from a molten metal temperature measuring element incorporated in a probe or various component sensor elements that can be separately attached and simultaneously processing the signals, thereby shortening an unprecedented production process. It is.
【図１】本発明の装置の概念図FIG. 1 is a conceptual diagram of the apparatus of the present invention.
【図２】本発明の他の装置の概念図FIG. 2 is a conceptual diagram of another apparatus of the present invention.
【図３】本発明の装置の雰囲気スラグ界面検知回路図FIG. 3 is a circuit diagram of an atmosphere slag interface detection device of the apparatus of the present invention.
１ プローブ ２ ランス ２ａ ホルダー ３ スラグ溶融金属界面検知用センサー ４ 溶融金属試料採取容器 ５ 溶融金属温度測定素子 ６ 雰囲気スラグ界面検知用電極 ７ スラグ ８ 溶鋼 ９ 演算器 １０ プローブ昇降距離伝達信号ライン １１ 雰囲気スラグ界面検知信号ライン １２ スラグ溶鋼界面検知信号ライン １３ プローブ（ランス）昇降装置 １４ スラグ溶融金属界面検知用センサー １５ コネクター １６ 比較器 １７ 基準位置信号ライン １８ プリセットリミットスイッチ １９ 外部機器駆動回路 DESCRIPTION OF SYMBOLS 1 Probe 2 Lance 2a holder 3 Slag molten metal interface detection sensor 4 Molten metal sample collection container 5 Molten metal temperature measuring element 6 Atmosphere slag interface detection electrode 7 Slag 8 Molten steel 9 Computing device 10 Probe up / down distance transmission signal line 11 Atmospheric slag Interface detection signal line 12 Slag molten steel interface detection signal line 13 Probe (lance) elevating device 14 Sensor for detecting slag molten metal interface 15 Connector 16 Comparator 17 Reference position signal line 18 Preset limit switch 19 External device drive circuit
フロントページの続き (72)発明者 阿江 主馬 大阪府大阪市西区西本町１丁目７番10号 川惣電機工業株式会社内 (56)参考文献 特開 昭63−62812（ＪＰ，Ａ) 特開 昭64−15310（ＪＰ，Ａ) 特開 昭61−217516（ＪＰ，Ａ) 実開 昭62−174770（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) C21C 5/46,7/00 G01B 7/06 B22D 11/18,39/02,41/08 G01F 1/00,23/24 G01N 9/28 Continuation of the front page (72) Inventor Shuma Ae 1-7-10 Nishihonmachi, Nishi-ku, Osaka-shi, Osaka Kawaso Electric Industry Co., Ltd. (56) References JP-A-63-62812 (JP, A) JP-A 64-15310 (JP, A) JP-A-61-217516 (JP, A) JP-A 62-174770 (JP, U) (58) Fields investigated (Int. Cl. 7 , DB name) C21C 5 / 46,7 / 00 G01B 7/06 B22D 11 / 18,39 / 02,41 / 08 G01F 1 / 00,23 / 24 G01N 9/28
Claims (3)
ねた雰囲気スラグ界面検知用電極と、磁界の変動による
共振状態の変化を検知するスラグ溶融金属界面検知用セ
ンサーを有し、前記スラグ溶融金属界面検知用センサー
がプローブ内に配置されたことを特徴とするスラグ厚測
定装置An slag molten metal interface detecting electrode, which also serves as a cap for protecting a molten metal temperature measuring element, and a slag molten metal interface detecting sensor for detecting a change in a resonance state due to a change in a magnetic field. A slag thickness measuring device characterized in that an interface detection sensor is arranged in a probe.
プローブを装着するランスの先に装着されるホルダー先
端部に配置されたことを特徴とする請求項１記載のスラ
グ厚測定装置2. A slag thickness measuring apparatus according to claim 1, wherein a sensor for detecting a slag molten metal interface is disposed at a tip of a holder attached to a tip of a lance for attaching the probe.
グ界面に接触した時の信号と、スラグ溶融金属界面検知
用センサーが磁界の変動によりスラグ溶融金属界面を検
知した時の信号と、前記プローブの測定位置を検出する
信号と、前記プローブの基準位置を検出する信号とから
スラグの厚さを計算する演算器を備えたことを特徴とす
る請求項１記載のスラグ厚測定装置3. A signal when the atmosphere slag interface detection electrode comes into contact with the atmosphere slag interface, a signal when the slag molten metal interface detection sensor detects the slag molten metal interface due to a change in the magnetic field, and 2. The slag thickness measuring device according to claim 1, further comprising a calculator for calculating a slag thickness from a signal for detecting a measurement position and a signal for detecting a reference position of the probe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07107759A JP3138953B2 (en) | 1995-03-27 | 1995-03-27 | Slag thickness measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07107759A JP3138953B2 (en) | 1995-03-27 | 1995-03-27 | Slag thickness measuring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08269529A JPH08269529A (en) | 1996-10-15 |
| JP3138953B2 true JP3138953B2 (en) | 2001-02-26 |
Family
ID=14467275
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP07107759A Expired - Lifetime JP3138953B2 (en) | 1995-03-27 | 1995-03-27 | Slag thickness measuring device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3138953B2 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100388027B1 (en) * | 1998-12-18 | 2003-08-19 | 주식회사 포스코 | Detachable sensor for slag thickness measurement |
| KR100406371B1 (en) * | 1998-12-24 | 2004-01-24 | 주식회사 우진 | Apparatus and method for detecting thickness of slag layer in ladle |
| JP4593030B2 (en) * | 2001-08-03 | 2010-12-08 | 川惣電機工業株式会社 | Molten metal level measuring device |
| KR20030052728A (en) * | 2001-12-21 | 2003-06-27 | 주식회사 포스코 | Apparatus for measuring of freeboard and slag depth and method for controlling of blowing depth of upper lance for using the same apparatus |
| MX351096B (en) * | 2010-04-30 | 2017-10-02 | Agellis Group Ab Star | Measurements in metallurgical vessels. |
| KR101257472B1 (en) * | 2010-09-29 | 2013-04-23 | 현대제철 주식회사 | Measuring apparatus for slag and measuring method thereof |
| WO2014021481A1 (en) * | 2012-08-01 | 2014-02-06 | (주)에스엔엔씨 | Apparatus for measuring height of molten material in electric furnace |
| JP6208004B2 (en) * | 2013-12-25 | 2017-10-04 | 奥村機械製作株式会社 | Temperature measuring device and temperature measuring method |
-
1995
- 1995-03-27 JP JP07107759A patent/JP3138953B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08269529A (en) | 1996-10-15 |
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