JPH0550203A - Device for controlling weight of molten steel in tundish in continuous casting - Google Patents

Device for controlling weight of molten steel in tundish in continuous casting

Info

Publication number
JPH0550203A
JPH0550203A JP21496091A JP21496091A JPH0550203A JP H0550203 A JPH0550203 A JP H0550203A JP 21496091 A JP21496091 A JP 21496091A JP 21496091 A JP21496091 A JP 21496091A JP H0550203 A JPH0550203 A JP H0550203A
Authority
JP
Japan
Prior art keywords
molten steel
tundish
opening
weight
control
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP21496091A
Other languages
Japanese (ja)
Other versions
JP2966979B2 (en
Inventor
Takashi Iwanaga
隆史 岩永
Satoru Nagai
哲 永井
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Kobe Steel Ltd
Original Assignee
Toshiba Corp
Kobe Steel Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toshiba Corp, Kobe Steel Ltd filed Critical Toshiba Corp
Priority to JP21496091A priority Critical patent/JP2966979B2/en
Publication of JPH0550203A publication Critical patent/JPH0550203A/en
Application granted granted Critical
Publication of JP2966979B2 publication Critical patent/JP2966979B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Continuous Casting (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)

Abstract

PURPOSE:To surely prevent clogging of a ladle slide nozzle by executing a feedback control to nozzle opening degree based on increasing ratio of molten steel wt. in a tundish. CONSTITUTION:After wholly opening the ladle slide nozzle 3 at the time of starting pouring, command is given to a control output holding device 27 from a control pattern change-over device 21. The opening degree of nozzle 3 is held until the actual wt. in the tundish becomes X1. At the time of exceeding the actual wt. X in the tundish, by changing over to control output side of a feedback controller 23 for molten steel wt., the aimed value K1 is set. An opening degree control output according to difference between calculated value by a molten steel wt. increasing ratio computing element 20 in the tundish and the aimed value K1, is inputted to an opening/closing pulse arithmetic part and feedback control for holding the molten steel wt. increasing ratio in the tundish to the aimed value X1, is executed. When the molten steel wt. in the tundish exceeds X2, the aimed value of the molten steel wt. increasing ratio is changed over to K2 smaller than K1.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、連続鋳造におけるタン
ディシュ溶鋼重量制御装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tundish molten steel weight control device in continuous casting.

【0002】[0002]

【従来の技術】タンディシュは、鋳型に溶鋼を注入する
際に用いられる中間鍋であり、連続鋳造ではこのタンデ
ィシュ内の溶鋼重量の制御が極めて重要である。
2. Description of the Related Art A tundish is an intermediate pot used when pouring molten steel into a mold, and in continuous casting, it is extremely important to control the weight of molten steel in the tundish.

【0003】そこで、従来は図4に示す構成のタンディ
シュ重量制御装置を備えてタンディシュ内に注入される
溶鋼の重量制御を行っていた。即ち、溶鋼が充填された
レードル1の溶鋼流出口に開度が調節可能なレードルス
ライドノズル3を設け、このレードルスライドノズル3
の開度を調節することにより、レードル1からタンディ
シュ2へ注入される溶鋼量を調節する。タンディシュ2
は、レードル1から溶鋼が注入されると共に注入された
溶鋼が鋳型4へ流入せしめられ、タンディシュ溶鋼重量
がタンディシュ内溶鋼重量測定器4によって測定され
る。この測定結果は重量測定器5へ入力され、そこでタ
ンディシュ重量実績が算出される。このタンディシュ重
量実績は、目標重量実績が設定されている溶鋼重量フィ
ードバック制御器6へ送られ、そこで目標値との偏差が
検出される。溶鋼重量フィードバック制御器6は、この
偏差が“0”となるように前記レードルスライドノズル
3の開閉にフィードバック制御をかける。そのため、前
記偏差に応じた開閉制御出力が開/閉パルス幅演算部8
へ与えられ、開/閉パルス幅演算部8から偏差に応じた
パルス幅の自動閉パルス信号又は自動開パルス信号が自
動/手動切替器9を介して開度調整用油圧装置10へ与
えられる。開度調整用油圧装置10は、閉パルス信号の
パルス幅に応じてレードルスライドノズル3を閉め、開
パルス信号のパルス幅に応じてレードルスライドノズル
3を開けるように開度調整を行う。また、レードルスラ
イドノズル3の開度調整を手動にて行う場合は、自動/
手動切替器9を現場手動開度操作器12側に切り替え
て、手動にて開パルス信号又は閉パルス信号を開度調整
用油圧装置10へ与えるようにする。
Therefore, conventionally, a tundish weight controller having the structure shown in FIG. 4 is provided to control the weight of molten steel injected into the tundish. That is, a ladle slide nozzle 3 having an adjustable opening is provided at the molten steel outlet of the ladle 1 filled with molten steel.
The amount of molten steel injected from the ladle 1 to the tundish 2 is adjusted by adjusting the opening degree of. Tundish 2
The molten steel is injected from the ladle 1, the injected molten steel is caused to flow into the mold 4, and the weight of the molten steel in the tundish is measured by the in-tandem molten steel weight measuring device 4. This measurement result is input to the weight measuring device 5, where the tundish weight performance is calculated. This tundish weight result is sent to the molten steel weight feedback controller 6 in which the target weight result is set, and the deviation from the target value is detected there. The molten steel weight feedback controller 6 applies feedback control to the opening and closing of the ladle slide nozzle 3 so that this deviation becomes "0". Therefore, the opening / closing control output corresponding to the deviation is output to the open / close pulse width calculation unit 8
The open / close pulse width calculation unit 8 supplies an automatic closing pulse signal or an automatic opening pulse signal having a pulse width corresponding to the deviation to the opening degree adjusting hydraulic device 10 via the automatic / manual switch 9. The opening degree adjusting hydraulic device 10 adjusts the opening degree so that the ladle slide nozzle 3 is closed according to the pulse width of the closing pulse signal and the ladle slide nozzle 3 is opened according to the pulse width of the opening pulse signal. In addition, when manually adjusting the opening of the ladle slide nozzle 3,
The manual switching device 9 is switched to the on-site manual opening operation device 12 side to manually apply the open pulse signal or the close pulse signal to the opening adjusting hydraulic device 10.

【0004】上述したタンディシュ溶鋼重量制御装置
は、タンディシュ2への溶鋼注入開始時は、オペレータ
が手動にてレードルスライドノズル3を全開にし、その
後、タンディシュ溶鋼重量が目標値に近づいたところで
上述した重量フィードバック制御を行っていた。
In the above-mentioned tundish molten steel weight control device, the operator manually fully opens the ladle slide nozzle 3 at the start of injecting molten steel into the tundish 2, and thereafter, when the weight of the tundish molten steel approaches the target value, It was performing feedback control.

【0005】ところが、上記重量フィードバック制御を
行った場合、目標到達後かなりのオーバーシュートがあ
り、自動閉パルス信号が出力され続けることからレード
ルスライドノズル3が閉塞する可能性が極めて高いとい
う問題があった。
However, when the above weight feedback control is performed, there is a considerable overshoot after reaching the target, and the automatic closing pulse signal continues to be output, so that there is a very high possibility that the ladle slide nozzle 3 is blocked. It was

【0006】また、上記のようなオーバーシュートによ
る閉塞を防止するために、注入開始時にオペレータの判
断によって目標重量を適宜変化させる方法が考えられる
が、この方法の場合にはオペレータの負担が大きくなる
という欠点がある。
In order to prevent the blockage due to the overshoot as described above, a method may be considered in which the target weight is appropriately changed according to the operator's judgment at the time of starting the injection, but in this method, the operator's burden becomes heavy. There is a drawback.

【0007】[0007]

【発明が解決しようとする課題】したがって、従来のタ
ンディシュ溶鋼重量制御装置は、オーバーシュートした
場合にはレードルスライドノズルが閉塞する可能性が高
く連続鋳造に悪影響を与える恐れがあり、しかもオペレ
ータにかかる負担が大きくなるという問題があった。
Therefore, in the conventional tundish molten steel weight control device, there is a high possibility that the ladle slide nozzle will be blocked when overshooting, which may adversely affect continuous casting, and moreover the operator is required to do so. There was a problem that the burden increased.

【0008】本発明は、以上のような実情に鑑みてなさ
れたもので、レードルスライドノズル3の閉塞を確実に
防止できて信頼性の高い連続鋳造を実現し得、しかもオ
ペレータの負担を軽減し得るタンディシュ溶鋼重量制御
装置を提供することを目的とする。
The present invention has been made in view of the above circumstances, and can reliably prevent clogging of the ladle slide nozzle 3 to realize highly reliable continuous casting, and reduce the burden on the operator. It is an object to provide an obtained tundish molten steel weight control device.

【0009】[0009]

【課題を解決するための手段】上記目的を達成するため
に、本発明に係るタンディシュ溶鋼重量制御装置は、レ
ードルと、このレードル内の溶鋼が注入されるタンディ
シュと、前記レードルの溶鋼流出口に設けられ前記タン
ディシュへの溶鋼流出量を調節するための開閉ノズル
と、この開閉ノズルの開度を制御する開度制御手段と、
前記タンディシュ内の溶鋼重量を測定するための溶鋼重
量測定手段と、この溶鋼重量測定手段で測定された溶鋼
重量に基づいて前記開度制御手段へ開度指令信号を与え
て前記タンディシュ内の溶鋼重量を制御する溶鋼重量フ
ィードバック制御系とを備えたタンディシュ溶鋼重量制
御装置において、前記溶鋼重量測定手段で測定された溶
鋼重量に基づいて前記タンディシュ内の溶鋼重量増加率
を算出する溶鋼増加率演算手段と、前記タンディシュ内
への溶鋼注入開始時に、前記溶鋼重量増加率演算手段で
算出された溶鋼重量増加率に基づいて該増加率が予め決
められた値となるように前記開度制御手段へ開度指令信
号を与える溶鋼重量増加率フィードバック制御系と、前
記レードルから流出する溶鋼流出量が基準値以下となっ
たとき前記開閉制御手段へ閉方向の開度指令信号が出力
するのを禁止する閉制限手段とを具備してなるものとし
た。
In order to achieve the above object, a tundish molten steel weight control apparatus according to the present invention comprises a ladle, a tundish into which molten steel in the ladle is injected, and a molten steel outlet of the ladle. An opening / closing nozzle provided for adjusting the molten steel outflow amount to the tundish, and an opening control means for controlling the opening of the opening / closing nozzle,
Molten steel weight measuring means for measuring the molten steel weight in the tundish, and a molten steel weight in the tundish by giving an opening command signal to the opening control means based on the molten steel weight measured by the molten steel weight measuring means In a tundish molten steel weight control device having a molten steel weight feedback control system for controlling, a molten steel increase rate calculating means for calculating a molten steel weight increase rate in the tundish based on the molten steel weight measured by the molten steel weight measuring means, and At the start of injecting the molten steel into the tundish, the opening control means is controlled so that the increase rate becomes a predetermined value based on the molten steel weight increase rate calculated by the molten steel weight increase rate calculating means. A molten steel weight increase rate feedback control system that gives a command signal, and the opening / closing control when the amount of molten steel flowing out from the ladle falls below a reference value. It was made by and a closed limit means closing direction of the opening command signal to the means prohibits to output.

【0010】[0010]

【作用】本発明によれば、タンディシュ内への溶鋼注入
開始時は、タンディシュ内の溶鋼重量増加率が予め設定
された増加率となるように溶鋼重量増加率フィードバッ
ク制御系によって開閉ノズルの開度が調整される。即
ち、開閉ノズルは常に開方向の指令が与えられ閉塞が防
止される。また、実際にレードルから流出する溶鋼流量
が基準値以下となった場合には、開閉ノズルが完全に閉
じられるのが禁止されて、その結果、開閉ノズルの閉塞
が防止される。
According to the present invention, when starting the injection of molten steel into the tundish, the opening degree of the opening / closing nozzle is controlled by the molten steel weight increase rate feedback control system so that the increased rate of molten steel weight in the tundish becomes a preset increase rate. Is adjusted. That is, the opening / closing nozzle is always given a command in the opening direction to prevent blockage. Further, when the molten steel flow rate actually flowing out from the ladle becomes equal to or less than the reference value, the opening / closing nozzle is prohibited from being completely closed, and as a result, the opening / closing nozzle is prevented from being blocked.

【0011】[0011]

【実施例】以下、本発明の実施例について説明する。図
1は一実施例にかかるタンディシュ溶鋼重量制御装置を
示す図である。なお、図4に示す装置と同一機能の部分
には同一の符号を付している。
EXAMPLES Examples of the present invention will be described below. FIG. 1 is a diagram showing a molten steel weight control device for tundish according to one embodiment. The parts having the same functions as those of the device shown in FIG. 4 are designated by the same reference numerals.

【0012】本実施例は、タンディシュ溶鋼実績を算出
する重量測定器6の出力側に、溶鋼重量フィードバック
制御器7、タンディシュ内溶鋼重量増加率演算器20、
制御パターン切替器21、レードル溶鋼流量演算器22
がそれぞれ並列接続されている。タンディシュ内溶鋼重
量増加率演算器20は、タンディシュ重量増加率実績M
(TON) を、 M=(現時点での重量実績−1制御周期前の重量実績)
×(60/制御周期) なる演算にて求め、溶鋼重量増加率フィードバック制御
器23へ出力する。
In this embodiment, the molten steel weight feedback controller 7, the molten steel weight increase rate calculator 20 in the tundish, is provided on the output side of the weight measuring device 6 for calculating the actual results of the molten steel in the tundish.
Control pattern switch 21, ladle molten steel flow rate calculator 22
Are connected in parallel. The molten steel weight increase rate calculator 20 in the tundish is the actual tundish weight increase rate M.
(TON), M = (current weight result-1 weight result before control cycle)
The value is calculated by the calculation x (60 / control cycle) and output to the molten steel weight increase rate feedback controller 23.

【0013】制御パターン切替器21は、溶鋼重量増加
率フィードバック制御器23において使用される増加率
目標値k1,k2の切替え、溶鋼重量増加率フィードバ
ック制御器23による溶鋼重量増加率フィードバック制
御と溶鋼重量フィードバック制御器7による溶鋼重量フ
ィードバック制御との切替え、および両フィードバック
制御と手動によるレードルスライドノズル開閉制御との
切替えを指示する各切替信号を出力する。レードル溶鋼
流量演算器22は、レードル溶鋼流出量R(TON) を、 R=(現時点でのWLOUT−1制御周期前のWLOUT)×
(60/制御周期) なる演算にて求める。ここで、WLOUT(TON) はレードル
スライドノズル3からの溶鋼流出トータル量であり、 WLOUT=WT +ΣrN N ・LN
The control pattern switching unit 21 switches the increase rate target values k1 and k2 used in the molten steel weight increase rate feedback controller 23, the molten steel weight increase rate feedback control and the molten steel weight by the molten steel weight increase rate feedback controller 23. Each switching signal for instructing switching between the molten steel weight feedback control by the feedback controller 7 and switching between both feedback controls and manual ladle slide nozzle opening / closing control is output. Ladle of molten steel flow rate calculation unit 22, a ladle of molten steel outflow R (TON), R = ( W LOUT -1 control cycle prior to the W LOUT at the present time) ×
(60 / control cycle) Here, W LOUT (TON) is the total amount of molten steel flowing out from the ladle slide nozzle 3, and W LOUT = W T + Σr N r N · L N

【0014】として求められる。なお、WT は現時点で
のタンディシュ重量 (TON)、rN は各ストランド単位長
さ辺りの鋳片重量 (TON/m)、LN は各ストランド鋳造
長、Nはストランド数をそれぞれ示している。
Is calculated as Incidentally, W T is a tundish weight at the present time (TON), r N is slab weight of Atari each strand unit length (TON / m), L N each strand casting length, N is the shows the number of strands, respectively ..

【0015】一方、溶鋼重量増加率フィードバック制御
器23は、制御パターン切替器21によって出力が切り
替えられる増加率目標値切替器24から増加率目標値k
が与えられ、タンディシュ内溶鋼重量増加率演算器20
から与えられるタンディシュ重量増加率実績Mが増加率
目標値kとなるように、増加率目標値との偏差に応じた
開度制御出力を制御出力切替器25へ出力する。制御出
力切替器25には、溶鋼重量フィードバック制御器7か
らの開閉制御出力も与えられ、制御パターン切替器21
からの切替信号によっていずれかの制御出力が選択され
る。この制御出力切替器25で選択された開閉制御出力
はレードルスライドノズル閉指令制限器26へ入力され
る。この閉指令制限器26にはさらにレードル溶鋼流量
演算器22から出力されたレードル溶鋼流出量Rも入力
される。閉指令制限器26では、レードル溶鋼流出量R
がレードルスライドノズル閉塞防止用に設定された基準
値を下回ると、閉方向の制御パルス信号が出力されるの
が禁止される。そして、閉指令制限器26から出力され
る開度制御出力は制御出力ホールド器27を介して開/
閉パルス幅演算部8へ入力される構成となっている。次
に、以上のように構成された本実施例の動作について説
明する。図2および図3はタンディシュ2への溶鋼注入
開始からの制御モード切替パターンを示している。
On the other hand, in the molten steel weight increase rate feedback controller 23, the increase rate target value k is output from the increase rate target value switch 24 whose output is switched by the control pattern switch 21.
Given, the molten steel weight increase rate calculator 20 in the tundish
The opening control output according to the deviation from the increase rate target value is output to the control output switching unit 25 so that the tundish weight increase rate actual value M given by the above becomes the increase rate target value k. The opening / closing control output from the molten steel weight feedback controller 7 is also given to the control output switching device 25, and the control pattern switching device 21
One of the control outputs is selected by the switching signal from. The opening / closing control output selected by the control output switch 25 is input to the ladle slide nozzle close command limiter 26. The closed command limiter 26 is also input with the ladle molten steel outflow amount R output from the ladle molten steel flow rate calculator 22. In the closing command limiter 26, the ladle molten steel outflow amount R
Is less than the reference value set for preventing the ladle slide nozzle blockage, output of the control pulse signal in the closing direction is prohibited. The opening control output from the close command limiter 26 is opened / closed via the control output hold device 27.
The configuration is input to the closed pulse width calculation unit 8. Next, the operation of this embodiment configured as described above will be described. 2 and 3 show a control mode switching pattern from the start of injecting molten steel into the tundish 2.

【0016】先ず、注入開始時は、現場手動開度操作器
12によってレードルスライドノズル3の開度を全開と
した後、自動モードに切替えられ、制御パターン切替器
21から制御出力ホールド器27へホールド指令が与え
られてタンディシュ重量実績がX1 となるまで開度がホ
ールドされる。タンディシュ重量実績がX1 を越えた時
点で、増加率目標値切替器24、制御出力切替器25、
制御出力ホールド器27が図示位置へ切替えられる。即
ち、溶鋼重量増加率フィードバック制御器23の制御出
力側に切替えられ、その制御の目標値としてk1が設定
される。そして、タンディシュ内溶鋼重量増加率演算器
20で算出された溶鋼重量増加率と目標値k1との偏差
に応じた開度制御出力が開/閉パルス幅演算部8へ入力
され、タンディシュ内溶鋼重量の増加率をk1に保つ重
量増加率フィードバック制御が行われる。
First, at the start of injection, after the opening of the ladle slide nozzle 3 is fully opened by the on-site manual opening operation device 12, the mode is switched to the automatic mode, and the control pattern switching device 21 holds the control output holding device 27. The command is given and the opening is held until the actual tundish weight becomes X 1 . When the actual tundish weight exceeds X 1 , the increase rate target value switch 24, the control output switch 25,
The control output hold device 27 is switched to the position shown. That is, the molten steel weight increase rate feedback controller 23 is switched to the control output side, and k1 is set as the target value for the control. Then, an opening control output corresponding to the deviation between the molten steel weight increase rate calculated by the tundish molten steel weight increase rate calculator 20 and the target value k1 is input to the open / close pulse width calculation section 8, and the molten steel weight in the tundish is calculated. The weight increase rate feedback control is performed to keep the increase rate of k1 at k1.

【0017】次に、タンディシュ内溶鋼重量がX2 を越
えると、制御パターン切替器21でこれが検知され、増
加率目標値切替器24によって増加率目標値がk1より
も小さな値のk2に切替えられる。これによって、タン
ディシュ内溶鋼重量の増加率を増加率勾配が緩やかな増
加率目標値k2に保つ重量増加率フィードバック制御が
行われる。即ち、タンディシュ内溶鋼重量が最終目標値
に近付くにしたがって、より緩やかな増加率に切替えら
れる。
Next, when the weight of molten steel in the tundish exceeds X 2 , this is detected by the control pattern switch 21 and the increase rate target value switcher 24 switches the increase rate target value to k2 which is a value smaller than k1. .. As a result, the weight increase rate feedback control is performed to keep the increase rate of the molten steel weight in the tundish at the increase rate target value k2 with a gentle increase rate gradient. That is, as the weight of molten steel in the tundish approaches the final target value, the gradual increase rate is switched.

【0018】次に、タンディシュ内溶鋼重量が最終目標
値近傍の値(最終目標値よりもαだけ小さな値)を越え
ると、これが制御パターン切替器21で検知されて制御
出力切替器25が溶鋼重量フィードバック制御器7側へ
切替えられ、前述した重量フィードバック制御が行われ
る。
Next, when the weight of molten steel in the tundish exceeds a value near the final target value (a value smaller than the final target value by α), this is detected by the control pattern switching unit 21 and the control output switching unit 25 causes the molten steel weight. It is switched to the feedback controller 7 side, and the above-mentioned weight feedback control is performed.

【0019】一方、レードル溶鋼流量演算器22では、
前記演算にてレードルスライドノズル3の開度を示すレ
ードル1からの溶鋼流出量Rが算出されて逐次閉指令制
限器26へ出力される。閉指令制限器26では、溶鋼流
出量Rが基準値を下回った時点で、即ちレードルスライ
ドノズル3の開度が小さくなり、さらに閉指令が出力さ
れると閉塞する可能性があるような場合に、溶鋼重量フ
ィードバック制御器7または溶鋼重量増加率フィードバ
ック制御器23からの開度制御出力のうち閉方向の制御
パルス信号が出力されるのを禁止する。従って、例えば
オーバーシュートにより自動閉パルス信号が出力され
て、レードルスライドノズル3が閉塞状態に近付くと、
閉塞する手前で開度がホールドされる。そして、タンデ
ィシュ2内の溶鋼量が流出してタンディシュ内溶鋼重量
が目標値を下回ることにより自動開パルス信号が出力さ
れると、再びフィードバック制御が開始される。
On the other hand, in the ladle molten steel flow rate calculator 22,
The molten steel outflow amount R from the ladle 1 which indicates the opening degree of the ladle slide nozzle 3 is calculated by the above calculation, and is output to the sequential closing command limiter 26. In the closing command limiter 26, when the molten steel outflow amount R falls below a reference value, that is, when the opening degree of the ladle slide nozzle 3 becomes small, and there is a possibility that the ladle slide nozzle 3 is closed when a closing command is output. Of the opening control outputs from the molten steel weight feedback controller 7 or the molten steel weight increase rate feedback controller 23, the output of the control pulse signal in the closing direction is prohibited. Therefore, for example, when the automatic closing pulse signal is output due to overshoot and the ladle slide nozzle 3 approaches the closed state,
The opening is held before closing. When the amount of molten steel in the tundish 2 flows out and the weight of molten steel in the tundish falls below the target value, and the automatic opening pulse signal is output, the feedback control is started again.

【0020】この様に本実施例によれば、タンディシュ
重量がある程度になるまではレードルスライドノズル3
の開度を全開に保持し、その後、目標重量近傍になるま
ではタンディシュ重量実績の増加率を制御変数としてレ
ードルスライドノズル3の開度制御を行ってタンディシ
ュ重量を制御するようにしたので、タンディシュ2への
溶鋼注入を速やかに行うことができる。しかも、タンデ
ィシュ2から鋳型4へ溶鋼注入を開始した場合には、少
くとも鋳型への流出量と同等の溶鋼流入を確保するため
の開制御が行われるため、レードルスライドノズル3の
閉塞を確実に防止できる。
As described above, according to this embodiment, the ladle slide nozzle 3 is used until the weight of the tundish reaches a certain level.
The tundish weight is controlled by controlling the opening degree of the ladle slide nozzle 3 with the increase rate of the tundish weight actual result as a control variable until the target weight is approached. It is possible to quickly inject molten steel into No. 2. Moreover, when the molten steel injection from the tundish 2 into the mold 4 is started, the open control for ensuring the molten steel inflow at least equal to the outflow amount into the mold is performed, so that the ladle slide nozzle 3 is reliably blocked. It can be prevented.

【0021】また、タンディシュ内溶鋼重量が目標値近
傍に達した場合に、レードル溶鋼流出量が閉塞する可能
性のある基準値を下回ったときには閉制御を禁止するよ
うにしたので、オーバーシュート等があった場合でも閉
塞を確実に防止でき、稼働効率の低下を防止でき、かつ
装置の信頼性を向上することができる。なお、本発明は
上記一実施例に限定されるものではない。例えば、レー
ドル1に重量測定センサを設けて、レードル溶鋼流出量
Rを、 R=(1制御周期前のレードル重量実績−現時点でのレ
ードル重量実績)×60/制御周期 といった演算にて求める構成とすることもできる。
Further, when the weight of molten steel in the tundish reaches near the target value and the ladle molten steel outflow amount falls below a reference value at which there is a possibility of blockage, the closing control is prohibited, so that overshoot or the like occurs. Even if there is, it is possible to reliably prevent the blockage, prevent a decrease in operating efficiency, and improve the reliability of the device. The present invention is not limited to the above embodiment. For example, a configuration is possible in which a ladle 1 is provided with a weight measurement sensor, and the ladle molten steel outflow amount R is calculated by a calculation such as R = (actual ladle weight result before one control cycle−current ladle weight result) × 60 / control cycle. You can also do it.

【0022】[0022]

【発明の効果】以上詳記したように本発明によれば、レ
ードルスライドノズルの閉塞を確実に防止できて信頼性
の高い連続鋳造を実現し得、しかもオペレータの負担を
軽減し得るタンディシュ溶鋼重量制御装置を提供でき
る。
As described in detail above, according to the present invention, it is possible to reliably prevent the clogging of the ladle slide nozzle, realize highly reliable continuous casting, and reduce the burden on the operator. A control device can be provided.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明一実施例に係るタンディシュ溶鋼重量制
御装置の構成図である。
FIG. 1 is a configuration diagram of a tundish molten steel weight control device according to an embodiment of the present invention.

【図2】一実施例における溶鋼重量制御動作を説明する
ための図である。
FIG. 2 is a diagram for explaining a molten steel weight control operation in one embodiment.

【図3】一実施例の制御モード切替パターンを説明する
ための図である。
FIG. 3 is a diagram for explaining a control mode switching pattern according to an embodiment.

【図4】従来のタンディシュ溶鋼重量制御装置の構成図
である。
FIG. 4 is a configuration diagram of a conventional tundish molten steel weight control device.

【符号の説明】[Explanation of symbols]

1…レードル、2…タンディシュ、3…レードルスライ
ドノズル、4…鋳型、5…タンディシュ内溶鋼重量測定
器、6…重量測定器、7…溶鋼重量フィードバック制御
器、8…開/閉パルス幅演算部、9…自動/手動切替
器、10…開度調整用油圧装置、20…タンディシュ内
溶鋼重量増加率演算器、21…制御パターン切替器、2
2…レードル溶鋼流量演算器、23…溶鋼重量増加率フ
ィードバック制御器、24…増加率目標値切替器、25
…制御出力切替器、26…レードルスライドノズル閉指
令制限器、27…制御出力ホールド器。
1 ... Ladle, 2 ... Tundish, 3 ... Ladle slide nozzle, 4 ... Mold, 5 ... Molten steel weight measuring instrument in tundish, 6 ... Weight measuring instrument, 7 ... Molten steel weight feedback controller, 8 ... Open / closed pulse width calculation unit , 9 ... Automatic / manual switching device, 10 ... Opening adjustment hydraulic device, 20 ... Tandish molten steel weight increase rate calculator, 21 ... Control pattern switching device, 2
2 ... Ladle molten steel flow rate calculator, 23 ... Molten steel weight increase rate feedback controller, 24 ... Increase rate target value selector, 25
Control output switch 26, ladle slide nozzle close command limiter 27, control output holder.

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 レードルと、このレードル内の溶鋼が注
入されるタンディシュと、前記レードルの溶鋼流出口に
設けられ前記タンディシュへの溶鋼流出量を調節するた
めの開閉ノズルと、この開閉ノズルの開度を制御する開
度制御手段と、前記タンディシュ内の溶鋼重量を測定す
るための溶鋼重量測定手段と、この溶鋼重量測定手段で
測定された溶鋼重量に基づいて前記開度制御手段へ開度
指令信号を与えて前記タンディシュ内の溶鋼重量を制御
する溶鋼重量フィードバック制御系とを備えたタンディ
シュ溶鋼重量制御装置において、前記溶鋼重量測定手段
で測定された溶鋼重量に基づいて前記タンディシュ内の
溶鋼重量増加率を算出する溶鋼増加率演算手段と、前記
タンディシュ内への溶鋼注入開始時に、前記溶鋼重量増
加率演算手段で算出された溶鋼重量増加率に基づいて該
増加率が予め決められた値となるように前記開度制御手
段へ開度指令信号を与える溶鋼重量増加率フィードバッ
ク制御系と、前記レードルから流出する溶鋼流出量が基
準値以下となったとき前記開閉制御手段へ閉方向の開度
指令信号が出力するのを禁止する閉制限手段とを具備し
たことを特徴とするタンディシュ溶鋼重量制御装置。
1. A ladle, a tundish into which molten steel in the ladle is injected, an opening / closing nozzle for adjusting a molten steel outflow amount to the tundish provided at a molten steel outlet of the ladle, and an opening / closing nozzle of the opening / closing nozzle. Degree control means for controlling the degree of molten steel, a molten steel weight measuring means for measuring the molten steel weight in the tundish, and an opening command to the opening control means based on the molten steel weight measured by the molten steel weight measuring means In a tundish molten steel weight control device having a molten steel weight feedback control system for giving a signal to control the molten steel weight in the tundish, a molten steel weight increase in the tundish based on the molten steel weight measured by the molten steel weight measuring means. Molten steel increase rate calculating means for calculating the rate, and by the molten steel weight increase rate calculating means at the time of injecting molten steel into the tundish Molten steel weight increase rate feedback control system for giving an opening command signal to the opening control means so that the increase rate becomes a predetermined value based on the molten steel weight increase rate, and molten steel outflow flowing out from the ladle. A tundish molten steel weight control device, comprising: a closing restriction means for prohibiting an opening instruction signal in the closing direction from being output to the opening / closing control means when the amount becomes equal to or less than a reference value.
JP21496091A 1991-08-27 1991-08-27 Tundish molten steel weight control system in continuous casting. Expired - Lifetime JP2966979B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP21496091A JP2966979B2 (en) 1991-08-27 1991-08-27 Tundish molten steel weight control system in continuous casting.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP21496091A JP2966979B2 (en) 1991-08-27 1991-08-27 Tundish molten steel weight control system in continuous casting.

Publications (2)

Publication Number Publication Date
JPH0550203A true JPH0550203A (en) 1993-03-02
JP2966979B2 JP2966979B2 (en) 1999-10-25

Family

ID=16664420

Family Applications (1)

Application Number Title Priority Date Filing Date
JP21496091A Expired - Lifetime JP2966979B2 (en) 1991-08-27 1991-08-27 Tundish molten steel weight control system in continuous casting.

Country Status (1)

Country Link
JP (1) JP2966979B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100344395C (en) * 2005-07-28 2007-10-24 西安重型机械研究所 Hydraulic system of crystallizer full hydraulic clamping
KR100797992B1 (en) * 2006-12-26 2008-01-28 주식회사 포스코 Auto control method of the melt weight in tundish in the process of continuous casting
CN112276070A (en) * 2020-10-16 2021-01-29 联峰钢铁(张家港)有限公司 Automatic tundish weight regulating and controlling method
CN115138832A (en) * 2021-03-29 2022-10-04 宝山钢铁股份有限公司 Method for prolonging number of pure steel pouring furnaces based on molten steel weight information

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100344395C (en) * 2005-07-28 2007-10-24 西安重型机械研究所 Hydraulic system of crystallizer full hydraulic clamping
KR100797992B1 (en) * 2006-12-26 2008-01-28 주식회사 포스코 Auto control method of the melt weight in tundish in the process of continuous casting
CN112276070A (en) * 2020-10-16 2021-01-29 联峰钢铁(张家港)有限公司 Automatic tundish weight regulating and controlling method
CN115138832A (en) * 2021-03-29 2022-10-04 宝山钢铁股份有限公司 Method for prolonging number of pure steel pouring furnaces based on molten steel weight information
CN115138832B (en) * 2021-03-29 2024-01-09 宝山钢铁股份有限公司 Method for prolonging number of pure steel pouring furnaces based on molten steel weight information

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