JPH05212516A - Device and method for controlling molten metal surface level in mold - Google Patents
Device and method for controlling molten metal surface level in moldInfo
- Publication number
- JPH05212516A JPH05212516A JP5671092A JP5671092A JPH05212516A JP H05212516 A JPH05212516 A JP H05212516A JP 5671092 A JP5671092 A JP 5671092A JP 5671092 A JP5671092 A JP 5671092A JP H05212516 A JPH05212516 A JP H05212516A
- Authority
- JP
- Japan
- Prior art keywords
- molten metal
- mold
- level
- metal surface
- variation
- 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.)
- Pending
Links
Landscapes
- Continuous Casting (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Control Of Non-Electrical Variables (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は連続鋳造設備における鋳
型内の溶湯体積変動及び湯面振動による湯面の変動を防
止する湯面レベル制御装置及びその方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molten metal level control apparatus and method for preventing molten metal volume fluctuation in a mold in continuous casting equipment and fluctuation of molten metal surface due to vibration of molten metal surface.
【０００２】[0002]
【従来の技術】板圧延の素材となるスラブ、継目無管の
素材となるビレット等を得るための一方法として広く実
施されている連続鋳造法においては、製品品質の安定向
上を図ると共に、操業停止を強いられるブレークアウト
の発生を未然に回避するため、従来から鋳型の内部に滞
留する溶湯の表面レベル（湯面レベル）を所定の目標レ
ベルに一致せしめるべく、前記鋳型への注湯量を調節す
る湯面レベル制御が行われている。鋳型内の湯面レベル
は透過式、或いは渦流式の湯面レベル計にて検出し、こ
の検出値と予め定めた目標値とを比較し、その偏差を解
消するようノズルの開度を調節し、給湯量を調整し、鋳
型内における溶湯体積が一定となるよう制御している。2. Description of the Related Art The continuous casting method, which is widely practiced as a method for obtaining a slab as a material for sheet rolling and a billet as a material for a seamless pipe, aims to improve product quality in a stable manner and In order to avoid the occurrence of breakouts that are forced to stop, the amount of molten metal poured into the mold has been adjusted so that the surface level (melt level) of the molten metal that has stagnated inside the mold has hitherto matched a predetermined target level. Level control is performed. The level of the molten metal in the mold is detected by a permeation type or swirl type molten metal level meter, the detected value is compared with a predetermined target value, and the nozzle opening is adjusted to eliminate the deviation. The amount of hot water supplied is adjusted to control the volume of the molten metal in the mold to be constant.
【０００３】湯面レベル制御に際しては、鋳型の内部で
変動する湯面レベルを、高い応答性にて精度良く測定す
ることが要求され、この要求を満たし得る測定手段とし
て渦流式湯面レベル計が広く用いられている。図６は渦
流式の湯面レベル計を用いて鋳型内の湯面レベルを検出
している態様を示す模式的側面図であり、図中１は鋳
型、２は鋳型１内に供給された溶湯、６は湯面レベル計
を示している。湯面レベル計６は送信コイル6a、受信コ
イル6bを一組としてこれを横並びにした状態で空冷構造
を備えたケース6c内に収容して構成されており、これを
鋳型１内の湯面上に臨ませて両コイル6a,6b の配列方向
を鋳型１の長辺方向と平行にした状態で配置してある。
送信コイル6aに高周波電流を通電すると湯面上に該送信
コイル6aとの間の相対距離に応じた強さの渦電流が生起
され、この渦電流により形成される磁場の強度を、受信
コイル6bの端子電圧の変化として取り出し、この結果か
ら湯面レベルを得るようになっている。In controlling the molten metal level, it is required to measure the molten metal level fluctuating inside the mold with high responsiveness with high accuracy. As a measuring means capable of satisfying this requirement, a swirl type molten metal level gauge is used. Widely used. FIG. 6 is a schematic side view showing a mode in which the level of molten metal in the mold is detected using a vortex flow level meter, in which 1 is a mold and 2 is molten metal supplied into the mold 1. , 6 are level gauges. The level meter 6 is composed of a transmitter coil 6a and a receiver coil 6b, which are set side by side and housed in a case 6c having an air-cooling structure. The coils 6a and 6b are arranged so that the arrangement direction of the coils 6a and 6b is parallel to the long side direction of the mold 1.
When a high frequency current is applied to the transmitter coil 6a, an eddy current having a strength corresponding to the relative distance between the transmitter coil 6a and the transmitter coil 6a is generated, and the strength of the magnetic field formed by this eddy current is changed to the receiver coil 6b. It is taken out as a change of the terminal voltage of and the molten metal level is obtained from this result.
【０００４】[0004]
【発明が解決しようとする課題】ところで上述した如き
従来装置にあっては渦流式の湯面レベル計６は鋳型１内
の溶湯体積変化による湯面の変化は勿論、溶湯の自由振
動による湯面変動も湯面レベルの変動として検出するた
め、湯面の振動が湯面レベル制御を行う上での外乱とな
り、発振状態になることがあるという問題があった。By the way, in the conventional apparatus as described above, the vortex flow level meter 6 not only changes the level of the molten metal in the mold 1 but also changes the level of the molten metal in the mold 1 as well as the free level of the molten metal. Since the fluctuation is also detected as the fluctuation of the molten metal level, the vibration of the molten metal level becomes a disturbance when performing the molten metal level control, which may cause an oscillation state.
【０００５】この対策として、鋳型内の進行波，定在波
等に起因する溶湯の振動を電磁ブレーキを動作させ、ノ
ズルからの吐出流速を抑制することで低減し、湯面レベ
ル計からのフィードバック信号をローパスフィルタによ
りフィルタリングして溶湯振動を湯面レベル変動として
捉えないようにすることが行われている。しかし電磁ブ
レーキによって吐出流速を制御すると表面流速が低下し
て皮張り等のトラブルが発生するため、これによっては
体積変動に伴う湯面レベルの制御を行うことが出来ず、
通常は電磁ブレーキを一定制御し、カスケード制御を働
かせているに留まる。また湯面レベル計からのフィード
バック信号をローパスフィルタによりフィルタリングす
るのは溶湯体積変動に伴う湯面レベルの測定精度と応答
性が低下するという難点があった。As a countermeasure against this, vibration of the molten metal caused by a traveling wave, a standing wave, etc. in the mold is reduced by operating an electromagnetic brake to suppress the discharge flow velocity from the nozzle, and feedback from the molten metal level gauge is used. The signal is filtered by a low-pass filter so that the vibration of the molten metal is not regarded as fluctuation of the molten metal level. However, if the discharge flow velocity is controlled by an electromagnetic brake, the surface flow velocity will decrease and problems such as skinning will occur, so it is not possible to control the level of the molten metal due to volume fluctuation.
Normally, the electromagnetic brake is controlled at a constant level, and the cascade control is activated. Further, filtering the feedback signal from the molten metal level meter with a low-pass filter has a drawback that the measuring accuracy and the responsiveness of the molten metal level are deteriorated due to the fluctuation of the molten metal volume.
【０００６】本発明はかかる事情に鑑みなされたもので
あって、その目的とするところは鋳型内における溶湯体
積の変化と振動とによる湯面変化とを弁別して検出し、
鋳型内の溶湯体積の変化に起因して変化した湯面レベル
を正確に捉え、その制御精度を高め得るようにした鋳型
内の湯面レベル制御装置及び制御方法を提供するにあ
る。The present invention has been made in view of such circumstances, and an object thereof is to discriminate and detect a change in molten metal volume in a mold and a change in molten metal surface due to vibration.
It is an object of the present invention to provide a molten metal level control device and control method for a molten metal level in a mold that can accurately detect a molten metal level caused by a change in the volume of molten metal in the mold and improve the control accuracy.
【０００７】[0007]
【課題を解決するための手段】本発明に係る鋳型内の湯
面レベル制御装置は、相互に所定の間隔を隔てて配置し
た送信コイル，受信コイルを備え、前記両コイルの配列
方向を互いに交叉する２方向に向けた状態で鋳型内の湯
面に対向させて配設した２組の渦流式の湯面レベル計
と、両湯面レベル計の出力に基づいて鋳型内溶湯体積の
変動に起因して変動した湯面位置と、鋳型内の湯面の振
動に起因して変動した湯面位置とを夫々弁別して求め、
前者を予め定める目標レベルに一致させ、また後者を抑
制すべく夫々制御信号を出力する演算制御装置とを具備
することを特徴とする。A molten metal level control device in a mold according to the present invention comprises a transmitting coil and a receiving coil which are arranged at a predetermined distance from each other, and the arrangement directions of the both coils are crossed with each other. Two sets of vortex flow level meters placed facing the molten metal level in the mold in two directions and caused by the fluctuation of the molten metal volume in the mold based on the output of both molten metal level meters Then, the molten metal surface position that fluctuates and the molten metal surface position that fluctuates due to the vibration of the molten metal surface in the mold are discriminated and obtained,
An arithmetic and control unit that outputs a control signal to match the former with a predetermined target level and suppress the latter, respectively.
【０００８】本発明に係る鋳型内の湯面レベル制御方法
は、鋳型内の湯面に対向させて送信コイル，受信コイル
の配列方向を互いに交叉する２方向に向けた状態で２組
の渦流式の湯面レベル計を配設し、両湯面レベル計にて
夫々鋳型内における湯面位置を検出して各湯面レベル計
の検出値及びその差を求め、これらに基づいて溶湯体積
変動に起因して変動した湯面位置と湯面振動に起因して
変動した湯面位置とを弁別して求める過程を含むことを
特徴とする。The method for controlling the level of molten metal in the mold according to the present invention is such that two sets of vortex flow type are arranged so as to face the molten metal in the mold so that the arrangement directions of the transmitting coil and the receiving coil are in two directions intersecting each other. The molten metal level gauges are installed, and the molten metal volume fluctuations are calculated based on the detected value of each molten metal level meter and its difference by detecting the molten metal position in the mold with both molten metal level meters. The method is characterized by including a process of discriminating and determining a molten metal surface position that has fluctuated due to the molten metal surface and a molten metal surface position that has fluctuated due to the molten metal surface vibration.
【０００９】[0009]
【作用】本発明にあっては、鋳型内の湯面上に臨ませ
て、送信コイル，受信コイルの配列方向を互いに交叉す
る向きにした２組の渦流式の湯面レベル計を用いること
で、湯面振動に対する感度差を利用して検出値から、溶
湯体積変化によって生じた湯面変動と湯面振動によって
生じた湯面変動とを弁別して捉えることが可能となる。According to the present invention, two sets of vortex flow level gauges are used, which face the level of the molten metal in the mold and the transmitting coils and the receiving coils are arranged so as to intersect each other. It is possible to discriminate the molten metal level fluctuation caused by the molten metal volume change and the molten metal level fluctuation caused by the molten metal level vibration from the detected value by using the difference in sensitivity to the molten metal level vibration.
【００１０】[0010]
【実施例】以下本発明をその実施例を示す図面に基づき
具体的に説明する。図１は本発明に係る鋳型内の湯面レ
ベル制御装置を示す模式図であり、図中１は平面視で長
方形状をなす鋳型、２は溶湯供給用のノズルを示してい
る。鋳型１内には、ノズル２を通じて溶湯（溶鋼）が供
給される。鋳型１内の湯面レベルはゲート３の開度を油
圧シリンダ４にて調節することで予め定めた目標値に一
致するよう制御され、また鋳型１内の湯面振動は電磁ブ
レーキ５にてノズル２からの溶湯の吐出流速を調節する
ことで抑制されるようになっている。電磁ブレーキ５は
鋳型１の外壁に面して設置されており、ノズル２から鋳
型１へ供給された溶湯の吐出反転流の流速を減速させ、
パウダーの巻込みを防止すると共に、溶湯の進行波，定
在波を低減せしめるようになっている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings showing the embodiments. FIG. 1 is a schematic view showing a molten metal level control device in a mold according to the present invention, in which 1 denotes a mold having a rectangular shape in plan view and 2 denotes a nozzle for supplying molten metal. Molten metal (molten steel) is supplied into the mold 1 through the nozzle 2. The level of the molten metal inside the mold 1 is controlled so as to match a predetermined target value by adjusting the opening of the gate 3 with the hydraulic cylinder 4, and the vibration of the molten metal inside the mold 1 is controlled by the electromagnetic brake 5 to the nozzle. It is controlled by adjusting the discharge flow velocity of the molten metal from No. 2. The electromagnetic brake 5 is installed facing the outer wall of the mold 1, and reduces the flow velocity of the discharge reversal flow of the molten metal supplied from the nozzle 2 to the mold 1,
It prevents powder entrainment and reduces the traveling and standing waves of the molten metal.
【００１１】鋳型１内の溶湯と対向する位置には２組の
渦流式の湯面レベル計６，７が鋳型１の長辺方向に所要
の間隔（例えば鋳型１内に生じる定在波の１／２波長
分）を隔てて配設されており、その各検出値は演算制御
装置20に取り込まれるようになっている。演算制御装置
20は各湯面レベル計６，７から取り込んだ検出値に対し
所定の演算処理を施し、その演算結果に基づいて前記ゲ
ート３に連結した油圧シリンダ４及び電磁ブレーキ５を
操作し、前者によって鋳型１内の溶湯体積の変化に起因
して変動した湯面位置を予め目標レベルに一致させるべ
く、また後者によって湯面振動の抑制を行うようになっ
ている。At a position facing the molten metal in the mold 1, two sets of vortex flow level gauges 6 and 7 are arranged at required intervals in the long side direction of the mold 1 (for example, 1 of standing wave generated in the mold 1). ./2 wavelengths), and the respective detection values thereof are taken into the arithmetic and control unit 20. Arithmetic control device
Numeral 20 performs a predetermined calculation process on the detection values taken in from the molten metal level gauges 6 and 7, and operates the hydraulic cylinder 4 and the electromagnetic brake 5 connected to the gate 3 based on the calculation result, and the former mold The molten metal surface position fluctuated due to the change in the molten metal volume in 1 is made to coincide with the target level in advance, and the latter suppresses the molten metal surface vibration.
【００１２】湯面レベル計６，７の構造は実質的に同じ
であり、湯面レベル計６について具体的に示すと図２に
示す如くである。図２は湯面レベル計６の具体的構成を
示す拡大断面図であり、測定対象となる湯面の上方に適
長離隔して配された基台11の下面に、送信コイル6a, 受
信コイル6bが夫々その軸心を前記湯面と略直交する向き
にして固定してある。基台11上部には中空の支持部12が
連設され、この支持部12の上端には支持体を兼ねる給気
管13が嵌着してあり、基台11は鋳型の上方に前記給気管
13を介して支持されている。The structures of the melt level gauges 6 and 7 are substantially the same, and the concrete structure of the melt level gauge 6 is as shown in FIG. FIG. 2 is an enlarged cross-sectional view showing a specific configuration of the molten metal level gauge 6, in which a transmitter coil 6a and a receiver coil are provided on the lower surface of a base 11 which is disposed above the molten metal surface to be measured with a proper distance. 6b are fixed so that their axes are substantially orthogonal to the molten metal surface. A hollow support part 12 is continuously provided on the upper part of the base 11, and an air supply pipe 13 also serving as a support is fitted to the upper end of the support part 12, and the base 11 is above the mold.
Supported through 13.
【００１３】基台11の下面には、一側の全面に開口を備
えた箱形形状をなす内側ケース14と、これよりも大きく
同様の形状をなす外側ケース15とが、後者が前者の外側
を被包する態様にて組合わされて、夫々の開口部に周設
された各別の連結フランジ14a 及び15a を介して固定さ
れている。前記内側ケース14はアルミナ (Al2 Ｏ3 ）製
であり、また前記外側ケース15は窒化珪素 (Si3 Ｎ4 ）
製であって、基台13に固定された送信コイル6a及び受信
コイル6bは両ケース14,15 により二重に被包された状態
となっている。On the lower surface of the base 11, there are an inner case 14 having a box shape having an opening on one side and an outer case 15 having a larger shape than this, the latter being the outside of the former. Are combined in such a manner that they are encapsulated, and are fixed via respective separate connection flanges 14a and 15a provided around the respective openings. The inner case 14 is made of alumina (Al 2 O 3 ), and the outer case 15 is silicon nitride (Si 3 N 4 ).
The transmitter coil 6a and the receiver coil 6b, which are manufactured and fixed to the base 13, are doubly covered by the cases 14 and 15.
【００１４】送信コイル6a及び受信コイル6bは、夫々中
空の鉄心を有し、内側ケース14の内部は、両コイル6a,6
b の中空部を介して前記支持部12の内側に連通させた状
態で相互に所定の間隔を隔てて横並びに配設されてい
る。また支持部12の外側には、これに沿って上方に延び
る通気路16が形成してあり、これらの通気路16は基台11
を貫通する孔11a を介して内側ケース14と外側ケース15
との間に連通させてある。The transmitting coil 6a and the receiving coil 6b each have a hollow iron core, and the inside of the inner case 14 has both coils 6a, 6b.
They are arranged side by side at a predetermined distance from each other in a state of communicating with the inside of the support portion 12 through the hollow portion of b. Further, on the outside of the support portion 12, there are formed air passages 16 extending upward along the same, and these air passages 16 are formed on the base 11.
Inner case 14 and outer case 15 through holes 11a passing through
It is in communication with.
【００１５】支持部12の内側には給気管13を介して冷却
用ガスとしてのＮ2 ガスが、また内側ケース14と外側ケ
ース15との間には通気管16を介して冷却用の空気が夫々
導入されている。このＮ2 ガスは支持部12の内側空洞か
ら送信コイル6a及び受信コイル6bの中空部を経て内側ケ
ース14の内側に導入され、この内部を循環して熱を奪
い、また空気は内側ケース14と外側ケース15との間に流
入し、外側ケース15から内側ケース14へ輻射熱を吸収す
るようになっている。N 2 gas serving as a cooling gas is provided inside the support portion 12 through the air supply pipe 13, and cooling air is provided between the inner case 14 and the outer case 15 through the ventilation pipe 16. It has been introduced respectively. The N 2 gas is introduced from the inner cavity of the support portion 12 into the inner case 14 through the hollow portions of the transmitter coil 6a and the receiver coil 6b, circulates inside the inner case 14 to remove heat, and the air is exchanged with the inner case 14. It flows in between the outer case 15 and the outer case 15, and absorbs radiant heat from the outer case 15 to the inner case 14.
【００１６】図３(a) は湯面レベル計の配置態様を示す
模式的平面図、図３(b) は同じく模式的側面図である。
夫々送信コイル6a,7a 、受信コイル6b,7b を所定の間隔
を隔てて横に並べて構成されており、湯面レベル計６に
あっては送信コイル6a, 受信コイル6bの配列方向を鋳型
１の長辺方向と平行に、また湯面レベル計７にあっては
送信コイル7a, 受信コイル7bの配列方向を鋳型１の短辺
方向と平行にした状態、換言すれば湯面レベル計６，７
の送信コイル6a,7a ，受信コイル6b,7b の配列方向を互
いに直交する方向にして配設されている。このような配
置を行うことによって、両湯面レベル計６，７は鋳型１
内における溶湯体積変化に伴う湯面変動に対する感度は
同じであるが、鋳型１内でその長辺方向に生じる進行波
（定在波）による湯面の垂直方向の変動に対する感度は
湯面レベル計６においては小さく、また湯面レベル計７
においては大きくなる。FIG. 3 (a) is a schematic plan view showing the arrangement of the level gauge, and FIG. 3 (b) is a schematic side view.
The transmitter coils 6a, 7a and the receiver coils 6b, 7b are arranged side by side at a predetermined interval. In the level gauge 6, the transmitter coils 6a, 6b are arranged in the direction of the mold 1. In a state parallel to the long side direction, and in the melt level meter 7, the arrangement direction of the transmitter coil 7a and the receive coil 7b is parallel to the short side direction of the mold 1, in other words, the melt level meter 6,7.
The transmitting coils 6a and 7a and the receiving coils 6b and 7b are arranged so that the arrangement directions thereof are orthogonal to each other. By making such an arrangement, the level gauges 6 and 7 on both sides of the mold are
The sensitivity to the fluctuation of the molten metal surface due to the change in the molten metal volume is the same, but the sensitivity to the fluctuation of the molten metal surface in the vertical direction due to the traveling wave (standing wave) generated in the long side direction in the mold 1 is 6 is small, and level gauge 7
Will be bigger in.
【００１７】図４は湯面レベル６，７と鋳型１内の溶湯
に生じた進行波との関係を示す説明図であり鋳型１の長
辺方向にＸ軸を、また湯面と垂直方向にＹ軸をとってあ
る。鋳型１の長辺方向に送信コイル6a，受信コイル6bを
配列してある湯面レベル計６にあってはその鋳型１の長
辺方向に対する検出域はＤ1 、これに対して鋳型１の短
辺方向に送信コイル7a，受信コイル7bを配列してある湯
面レベル計７にあってはその鋳型１の長辺方向に対する
検出域はＤ2 （但しＤ1 ＞Ｄ2 ）となり、検出値はこの
検出域Ｄ1,Ｄ2 の平均値として捉えられるから湯面レベ
ル計６よりも湯面レベル計７による検出感度が高くな
る。FIG. 4 is an explanatory view showing the relationship between the levels 6 and 7 of the molten metal surface and the traveling waves generated in the molten metal in the mold 1. The X axis is in the direction of the long side of the mold 1, and the direction perpendicular to the molten metal surface. The Y axis is taken. In the melt level meter 6 in which the transmitter coil 6a and the receiver coil 6b are arranged in the long side direction of the mold 1, the detection area in the long side direction of the mold 1 is D 1 , while the short range of the mold 1 is short. In the melt level meter 7 in which the transmitting coil 7a and the receiving coil 7b are arranged in the side direction, the detection area in the long side direction of the mold 1 is D 2 (however, D 1 > D 2 ), and the detected value is Since it is captured as an average value of the detection areas D 1 and D 2 , the detection sensitivity by the level gauge 7 is higher than that by the level gauge 6.
【００１８】図５は演算制御装置20の主要構成を示すブ
ロック図であり、各湯面レベル計６，７の検出値は夫々
増幅器21,22 にて増幅した後、減算器23にて減算され
る。湯面レベル計６，７夫々の検出値Ｌ1 ，Ｌ2 は溶湯
体積変動に起因して変化した湯面の位置の検出値を
Ｖ1 、進行波に起因して変化した湯面位置の検出値をＶ
2 ，Ｖ2 ′とすると、下記(1),(2) 式で表わせる。FIG. 5 is a block diagram showing the main configuration of the arithmetic and control unit 20. The detected values of the molten metal level gauges 6 and 7 are respectively amplified by amplifiers 21 and 22 and then subtracted by a subtractor 23. It The detected values L 1 and L 2 of the molten metal level gauges 6 and 7 are V 1 which is the detected value of the molten metal position caused by the fluctuation of the molten metal volume, and the detected molten metal position which is changed due to the traveling wave. Value is V
2 , V 2 ′ can be expressed by the following equations (1) and (2).
【００１９】Ｌ1 ＝Ｖ1 ＋Ｖ2 …(1) Ｌ2 ＝Ｖ1 ＋Ｖ2 ′ …(2) 従って両者の差Ｌ1 −Ｌ2 は下記(3) 式で表わせる。 Ｌ1 −Ｌ2 ＝Ｖ2 −Ｖ2 ′ …(3)L 1 = V 1 + V 2 (1) L 2 = V 1 + V 2 ′ (2) Therefore, the difference L 1 -L 2 between them can be expressed by the following equation (3). L 1 -L 2 = V 2 -V 2 '... (3)
【００２０】次にこの差をFET(高速フーリエ変換器) 24
にて検出値Ｖ2 （又はＶ2 ′）の周波数を求める。周波
数は検出値Ｖ2 ，Ｖ2 ′において同一である。FET24 に
て求めた周波数は前記湯面レベル計６の検出値Ｌ1 と共
にフィルタ25に通して演算器26へ入力される。演算器26
は溶湯体積変動に起因して変化した湯面位置を算出し、
これと目標レベルＬ0 との差を求め、ゲート開度指令と
して図１に示す油圧シリンダ４の開度設定器８へ出力す
る。Next, this difference is calculated by FET (Fast Fourier Transform) 24
Then, the frequency of the detected value V 2 (or V 2 ′) is obtained. The frequencies are the same in the detected values V 2 and V 2 ′. The frequency obtained by the FET 24 is passed through the filter 25 together with the detected value L 1 of the molten metal level gauge 6 and input to the calculator 26. Calculator 26
Calculates the molten metal surface position that has changed due to the change in molten metal volume,
The difference between this and the target level L 0 is calculated and output as a gate opening command to the opening setting device 8 of the hydraulic cylinder 4 shown in FIG.
【００２１】開度設定器８は油圧シリンダ４に付設して
あるロッド位置検出器4aの検出値とゲート開度指令とを
比較し、両者の差に相応する信号を油圧シリンダ４へ出
力し、油圧シリンダ４を操作してゲート３の開度調節を
行なうようになっている。一方減算器23にて求めた両湯
面レベル計６，７の差信号Ｖ2 −Ｖ2 ′は演算器27に入
力される。演算器27は溶湯振動に起因して変化した湯面
位置を算出し、これを予め定めた基準値と比較し、該基
準値Ｖ0 を越えるとスイッチ28を介して電磁ブレーキ５
へ溶湯振動を抑制すべく所定の信号｛Ｅ0 ＋Ｋ（Ｖ−Ｖ
0 ）｝（但しＫ：係数，Ｅ0 ：基準電圧）を出力する。The opening setting device 8 compares the detection value of the rod position detector 4a attached to the hydraulic cylinder 4 with the gate opening command, and outputs a signal corresponding to the difference between the two to the hydraulic cylinder 4, The opening degree of the gate 3 is adjusted by operating the hydraulic cylinder 4. On the other hand, the difference signal V 2 −V 2 ′ between the two molten metal level gauges 6 and 7 obtained by the subtractor 23 is input to the calculator 27. The calculator 27 calculates the molten metal surface position which has changed due to the vibration of the molten metal, compares this with a predetermined reference value, and when the reference value V 0 is exceeded, the electromagnetic brake 5 is passed through the switch 28.
A predetermined signal {E 0 + K (V-V
0 )} (K: coefficient, E 0 : reference voltage) is output.
【００２２】[0022]
【発明の効果】以上の如く本発明装置及び本発明方法に
あっては送信コイル，受信コイルの配列方向を鋳型内の
湯面上において互いに交叉する２方向に向けて配設した
２組の渦流式の湯面レベル計と、両湯面レベル計夫々の
検出値及びその差に基づいて鋳型内溶湯体積変動に起因
して変化した湯面位置、並びに溶湯振動に起因して変化
した湯面位置を弁別して求めるから、夫々に対する個別
の制御が可能となり、溶湯振動による外乱を除去した正
確な湯面レベル制御が可能となる等本発明は優れた効果
を奏するものである。As described above, in the apparatus and method of the present invention, two sets of vortex flow are arranged so that the arrangement directions of the transmitting coil and the receiving coil are in two directions intersecting with each other on the molten metal surface in the mold. Type molten metal level meter, the molten metal position changed due to the molten metal volume fluctuation in the mold based on the detected value and the difference between both molten metal level meters, and the molten metal position changed due to the molten metal vibration Therefore, the present invention has excellent effects such that individual control can be performed for each of them and accurate level control of the molten metal surface without disturbance caused by vibration of the molten metal can be performed.
【図１】本発明装置の模式図である。FIG. 1 is a schematic view of a device of the present invention.
【図２】湯面レベル計の具体的構成を示す拡大断面図で
ある。FIG. 2 is an enlarged cross-sectional view showing a specific configuration of a molten metal level gauge.
【図３】湯面レベル計の配置態様を示す説明図である。FIG. 3 is an explanatory diagram showing an arrangement mode of a molten metal level gauge.
【図４】各湯面レベル計の特性説明図である。FIG. 4 is a characteristic explanatory view of each molten metal level meter.
【図５】演算制御装置のブロック図である。FIG. 5 is a block diagram of an arithmetic and control unit.
【図6 】従来装置の模式図である。FIG. 6 is a schematic view of a conventional device.
１ 鋳型 ２ ノズル ３ ゲート ４ 油圧シリンダ ５ 電磁ブレーキ ６, ７ 湯面レベル計 6a,7a 送信コイル 6b,7b 受信コイル 20 演算制御装置 23 減算器 24 FFT 25 フィルタ 26,27 演算器 1 Mold 2 Nozzle 3 Gate 4 Hydraulic Cylinder 5 Electromagnetic Brake 6 and 7 Liquid Level Meter 6a, 7a Transmitting coil 6b and 7b Receive coil 20 Arithmetic control device 23 Subtractor 24 FFT 25 Filter 26, 27 Arithmetic unit
Claims (2)
コイル，受信コイルを備え、前記両コイルの配列方向を
互いに交叉する方向に向けた状態で鋳型内の湯面に対向
させて配設した２組の渦流式の湯面レベル計と、両湯面
レベル計の出力に基づいて鋳型内溶湯体積の変動に起因
して変動した湯面位置と、鋳型内の湯面の振動に起因し
て変動した湯面位置とを夫々弁別して求め、前者を予め
定める目標レベルに一致させ、また後者を抑制すべく夫
々制御信号を出力する演算制御装置とを具備することを
特徴とする鋳型内の湯面レベル制御装置。1. A transmitter coil and a receiver coil, which are arranged at a predetermined interval from each other, and are arranged so as to face a molten metal surface in a mold with the arrangement directions of the both coils facing each other. 2 sets of vortex flow level meters, and the position of the level of the molten metal that fluctuated due to the fluctuation of the molten metal volume in the mold based on the output of both level meters, and the vibration of the molten metal level inside the mold. And the molten metal surface position that has been fluctuated by discriminating the former, the former is made to match a predetermined target level, and the arithmetic and control unit that outputs respective control signals to suppress the latter Level control device.
受信コイルの配列方向を互いに交叉する２方向に向けた
状態で２組の渦流式の湯面レベル計を配設し、両湯面レ
ベル計にて夫々鋳型内における湯面位置を検出して各湯
面レベル計の検出値及びその差を求め、これらに基づい
て溶湯体積変動に起因して変動した湯面位置と湯面振動
に起因して変動した湯面位置とを弁別して求める過程を
含むことを特徴とする鋳型内の湯面レベル制御方法。2. A transmitter coil facing the molten metal in the mold,
Two sets of vortex flow level meters are installed with the receiving coils arranged in two directions that intersect with each other, and both level levels are used to detect the level of molten metal in the mold. Includes the process of obtaining the detected value of the molten metal level meter and the difference, and discriminating the molten metal position caused by the molten metal volume variation and the molten metal position caused by the molten metal vibration based on these A method for controlling a molten metal level in a mold, which is characterized by the above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5671092A JPH05212516A (en) | 1992-02-08 | 1992-02-08 | Device and method for controlling molten metal surface level in mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5671092A JPH05212516A (en) | 1992-02-08 | 1992-02-08 | Device and method for controlling molten metal surface level in mold |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05212516A true JPH05212516A (en) | 1993-08-24 |
Family
ID=13035039
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5671092A Pending JPH05212516A (en) | 1992-02-08 | 1992-02-08 | Device and method for controlling molten metal surface level in mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05212516A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010069513A (en) * | 2008-09-19 | 2010-04-02 | Jfe Steel Corp | Method for controlling level of molten metal surface in mold of continuous casting machine |
| JP2016022523A (en) * | 2014-07-23 | 2016-02-08 | 新日鐵住金株式会社 | State estimation method for molten metal surface variation in continuous casting mold |
| JP2016022522A (en) * | 2014-07-23 | 2016-02-08 | 新日鐵住金株式会社 | State estimation method for molten metal surface variation in continuous casting mold |
-
1992
- 1992-02-08 JP JP5671092A patent/JPH05212516A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010069513A (en) * | 2008-09-19 | 2010-04-02 | Jfe Steel Corp | Method for controlling level of molten metal surface in mold of continuous casting machine |
| JP2016022523A (en) * | 2014-07-23 | 2016-02-08 | 新日鐵住金株式会社 | State estimation method for molten metal surface variation in continuous casting mold |
| JP2016022522A (en) * | 2014-07-23 | 2016-02-08 | 新日鐵住金株式会社 | State estimation method for molten metal surface variation in continuous casting mold |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA1120235A (en) | Method and apparatus for regulating the bath level in a continuous casting mould by means of alternating electro-magnetic fields | |
| US7971630B2 (en) | Method and apparatus for detecting a crater end of a continuously cast product | |
| JP2006192473A (en) | Method for measuring level of molten steel in casting mold of continuous casting facility | |
| KR20010023598A (en) | Method and device for control of metal flow during continuous casting using electromagnetic fields | |
| JP3034957B2 (en) | Plate mold for producing continuous cast material from steel | |
| JPH05212516A (en) | Device and method for controlling molten metal surface level in mold | |
| JP4453556B2 (en) | Manufacturing method of continuous cast slab | |
| US4867226A (en) | Method of oscillating continuous casting mold at high frequencies and mold oscillated by such method | |
| JP5098394B2 (en) | Continuous casting slab manufacturing method, continuous casting machine | |
| JPH02200362A (en) | Method for predicting and restraining nozzle clogging in continuous casting apparatus | |
| JP2005028381A (en) | Instrument for detecting molten metal surface level in mold | |
| JPH08211084A (en) | Flow velocity measuring device | |
| JP2008238257A (en) | Method for producing continuously cast slab and continuous caster | |
| JP2009195937A (en) | Method for producing continuously cast slab, and continuous casting machine | |
| JPH09168847A (en) | Method for continuously casting steel | |
| JPH03294053A (en) | Method for controlling drift flow of molten steel in continuous casting mold | |
| JPS607574B2 (en) | Continuous casting equipment | |
| JPH01284471A (en) | Device for detecting distribution of molten metal level in mold | |
| JP4414609B2 (en) | Method and apparatus for detecting drift in molten steel in continuous casting of steel | |
| JPS61239120A (en) | Method and device for calibrating electromagnetic induction type level meter | |
| JPH02140621A (en) | Vortex type mold level instrument | |
| KR20010087620A (en) | Method of and apparatus for determining the melt level in a mold by a detector of eddy- current | |
| JP4296946B2 (en) | Method and device for detecting solidification completion position of continuous cast slab | |
| JPH04309445A (en) | Molten steel level measuring method for continuous casting mold | |
| JPH08211086A (en) | Method and device for measuring flow velocity |