JPS60148652A - Detection of end point of molten steel pouring - Google Patents
Detection of end point of molten steel pouringInfo
- Publication number
- JPS60148652A JPS60148652A JP301384A JP301384A JPS60148652A JP S60148652 A JPS60148652 A JP S60148652A JP 301384 A JP301384 A JP 301384A JP 301384 A JP301384 A JP 301384A JP S60148652 A JPS60148652 A JP S60148652A
- Authority
- JP
- Japan
- Prior art keywords
- molten steel
- slag
- nozzle
- sound
- end point
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
- B22D11/181—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level
- B22D11/186—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level by using electric, magnetic, sonic or ultrasonic means
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は溶鋼の連続鋳造において、注入ノズルからのス
ラグの流出時、いわゆる注入終点を検知する方法に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for detecting the so-called injection end point when slag flows out from an injection nozzle in continuous casting of molten steel.
精錬後、取鍋に収容さｎｆｃ溶鋼上には通常、スラブが
浮上している。この敗鍋内溶鋼を連続鋳造によシ、タン
ディツシュに注入する際、まず溶鋼が流出し、溶鋼が無
くなった時点でスラグが流出する。After refining, a slab usually floats above the NFC molten steel contained in the ladle. When the molten steel in the broken ladle is continuously cast and poured into the tundish, the molten steel first flows out, and when the molten steel runs out, the slag flows out.
ここで取鍋内から流出するスラグｉｆ最小限にとどめる
ことが鋳片品質および操業上重要である。It is important for the quality of slabs and operation to minimize the slag if flowing out from inside the ladle.
すなわちタンディツシュ内にスジ１グが流入すると、連
々鋳の場合、後鍋から注入する溶鋼によりタンディツシ
ュ内スラグのたたき込みが起こシ、鋳片内にスラグが混
入し、品質上悪影響を及ぼす。又、流入したスラグによ
りタンディツシュ内張材の溶損が大きくな９、さらにこ
のスラグの取除きなど操業上の問題も発生する。That is, when a streak 1 g flows into the tundish, in the case of continuous casting, the molten steel injected from the rear pot causes the slag to be pounded into the tundish, and the slag gets mixed into the slab, which has an adverse effect on quality. In addition, the inflowing slag causes significant erosion of the tundish lining material9, and furthermore, operational problems such as the removal of this slag occur.
従来、スラグの流出を検知する方法としては、特開昭４
９−１４３０のように、溶鋼とスラブの導電率が相違す
ることを利用して、導電率の変化を電気的に検出する方
法が報告さｎている。しかし、この方法は、ノズル部に
電気的な発信又は受信装置を設置しなくてはならず、取
扱いが繁雑となる。Conventionally, as a method for detecting slag outflow,
No. 9-1430, a method of electrically detecting a change in conductivity by utilizing the difference in conductivity between molten steel and a slab has been reported. However, this method requires installing an electrical transmitting or receiving device in the nozzle section, making handling complicated.
又、こｎらの装置は温度に対する影響が大きいため冷却
装置を必要とする等保守も繁雑である。Furthermore, since these devices have a large influence on temperature, they require a cooling device and require complicated maintenance.
本発明は、こｎらの問題を解決し、スラグの検知を容易
に、しかも確実に行うことを目的とする。The present invention aims to solve these problems and to detect slag easily and reliably.
本発明は、注入ノズル又は該注入ノズルに連なる部材に
集音器を設置し、溶鋼注入中において音波を検出し、該
検出値が設定値以下に低下しに時をスラグ流出時とする
ことを特徴とする。The present invention installs a sound collector on an injection nozzle or a member connected to the injection nozzle, detects sound waves during injection of molten steel, and determines when the detected value drops below a set value as slag outflow. Features.
本発明者等は、注入ノズルを通過する物体が、溶鋼かス
ラグかで、ノズルに伝播される音の大きさが異なること
を発見した。即ち、注入ノズルを取付けるための金物に
検音棒を当接して流出音を聞くと、溶鋼流出中は、流体
の流ｆる音が明確に聞き取ｎるが、溶鋼からスラグに切
替ったと同時にその音が非常に小さくなることを発見し
た。The present inventors have discovered that the magnitude of the sound propagated to the nozzle differs depending on whether the object passing through the injection nozzle is molten steel or slag. In other words, if you listen to the sound of flowing fluid by placing a sounding rod against the hardware used to attach the injection nozzle, you can clearly hear the sound of flowing fluid while molten steel is flowing out, but as soon as the molten steel switches to slag, I discovered that the sound became very quiet.
本発明はこのような知見に基づいてなさｆｌ、 ７ｒも
のである。The present invention was made based on this knowledge.
以下、図面に示す実施例によって説明する。 The embodiments shown in the drawings will be explained below.
第１図は、注入ノズル３を受ける金物１３に集音器（マ
イクロホン）９を設置した例を示し、取鍋１内の溶鋼７
は流量を制御するためのスライディングノズル２及び空
気酸化を防止するための注入ノズル３を通ってタンディ
ツシュ４に注入され１更に浸漬ノズル５を通って鋳型６
内に注入され凝固していく。ここで取鍋１内には、溶鋼
７とスラグ８とが層状に存在しており、溶鋼注入終了後
はスラグが流出していく。このスラグ流出を検知するた
め、注入ノズル３を受ける金物に集音器９を取付け、該
集音器９によって流出音を検出する。検出信号はアンプ
１０で増幅され、調整器１１において設定値と比較さｎ
１検出値が設定値以下になったとき指示制御計１２に出
力され、該指示制御計１２からスライディングノズル２
を閉塞する信号が出力さｎる。FIG. 1 shows an example in which a sound collector (microphone) 9 is installed on a hardware 13 that receives the injection nozzle 3, and the molten steel in the ladle 1 is
is injected into the tundish 4 through a sliding nozzle 2 to control the flow rate and an injection nozzle 3 to prevent air oxidation 1, and then through a submerged nozzle 5 to the mold 6.
It is injected into the body and solidifies. Here, in the ladle 1, molten steel 7 and slag 8 exist in a layered manner, and after the molten steel is poured, the slag flows out. In order to detect this slag outflow, a sound collector 9 is attached to the metal fitting that receives the injection nozzle 3, and the outflow sound is detected by the sound collector 9. The detection signal is amplified by an amplifier 10 and compared with a set value in a regulator 11.
1 When the detected value becomes less than the set value, it is output to the indicator controller 12, and from the indicator controller 12 it is output to the sliding nozzle 2.
A signal is output to block the
第３図には、溶鋼およびスラグ流出時の音波信号を示し
た。同図から明らかなように溶鋼流出時には高い音波を
発生するが、スラグが流出するＡ点よりその音波は激減
する。又タンディツシュ湯面上にスラブの浮上が肉眼観
察された８点は、Ａ点よ９３〜５秒遅く、本発明方法に
よ對ば早期に、かつ適確に終点を判定できることが解か
る。FIG. 3 shows sonic signals when molten steel and slag flow out. As is clear from the figure, high sound waves are generated when molten steel flows out, but the sound waves are drastically reduced from point A where slag flows out. In addition, the eight points where the floating of the slab above the tanditsu water surface was observed with the naked eye were 93 to 5 seconds later than point A, which shows that the method of the present invention allows early and accurate determination of the end point.
第２図には、金物１３を外部よシ受けるための取鍋受装
置１４０部位に集音器９を取付けた実施例が示さｎ、で
いる。FIG. 2 shows an embodiment in which a sound collector 9 is attached to a ladle holder 140 for receiving a hardware 13 from the outside.
本発明によｎば、注入、終点を簡単な装置で、高精度で
検出できるので、早期に、かつ確実に検出でき、スラグ
の鋳片内まき込みによる鋳片品質不良及びスラグのタン
ディツシュ内流入による耐火物溶損及び該スラグの除去
作業が解消さｎる効果を有する。According to the present invention, since the injection and end points can be detected with high precision using a simple device, it is possible to detect early and reliably, and prevent quality defects in the slab due to slag being mixed into the slab, as well as inflow of slag into the tundish. This has the effect of eliminating the erosion of the refractories and the work of removing the slag.
第１図、第２図は本発明を実施するための装置例を示す
図、第３図は注入時間経過と音波信号との関係を示す図
である。
１・・ｉ取鍋、２・・・スライディングノズル、３・・
・注入ノズル、４・・・タンディツシュ、５・・・浸漬
ノズル、６・・・鋳型、７・・・溶鋼、８・・・スラグ
、９・・・集音器（マイクロホン）、１０・・・アンプ
、１１・・・調整器、１２・・・指示制御計、１３・・
・注入ノズル受金物、１４・・・取鍋受装置。
代理人 弁理士 秋 沢 政 光
他Ｚ名FIGS. 1 and 2 are diagrams showing an example of an apparatus for carrying out the present invention, and FIG. 3 is a diagram showing the relationship between the passage of injection time and a sound wave signal. 1...i ladle, 2...sliding nozzle, 3...
・Injection nozzle, 4... Tandish, 5... Immersion nozzle, 6... Mold, 7... Molten steel, 8... Slag, 9... Sound collector (microphone), 10... Amplifier, 11...Adjuster, 12...Indicator and controller, 13...
- Injection nozzle holder, 14... ladle holder device. Agent: Patent attorney Masaaki Akizawa and other Z names
Claims (2)
る音の変化を検知することによって前記注入ノズル内の
流ｎが溶鋼からスラグに変わったことを判定することを
特徴とする溶鋼注入終点の検知方法。(1) Detection of the end point of molten steel injection, characterized in that it is determined that the flow n in the injection nozzle has changed from molten steel to slag by detecting a change in the sound emitted by the injection nozzle or a member connected to the injection nozzle. Method.
囲第１項記載の溶鋼注入終点の検知方法。(2) A method for detecting the end point of molten steel injection according to claim 1, wherein a change in sound is detected using a microphone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP301384A JPS60148652A (en) | 1984-01-11 | 1984-01-11 | Detection of end point of molten steel pouring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP301384A JPS60148652A (en) | 1984-01-11 | 1984-01-11 | Detection of end point of molten steel pouring |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60148652A true JPS60148652A (en) | 1985-08-05 |
Family
ID=11545452
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP301384A Pending JPS60148652A (en) | 1984-01-11 | 1984-01-11 | Detection of end point of molten steel pouring |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60148652A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5042700A (en) * | 1989-05-12 | 1991-08-27 | Stopinc Aktiengesellschaft | Process and equipment to determine disturbance variables when pouring molten metal from a container |
| US6539805B2 (en) | 1994-07-19 | 2003-04-01 | Vesuvius Crucible Company | Liquid metal flow condition detection |
| CN102527969A (en) * | 2010-12-23 | 2012-07-04 | 北京中远通科技有限公司 | Automatic ladle slag outflow detection system and method thereof |
| CN108607968A (en) * | 2016-12-12 | 2018-10-02 | 上海梅山钢铁股份有限公司 | A kind of forecasting procedure of the continuous casting tundish slag based on Lower proterozoic group |
-
1984
- 1984-01-11 JP JP301384A patent/JPS60148652A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5042700A (en) * | 1989-05-12 | 1991-08-27 | Stopinc Aktiengesellschaft | Process and equipment to determine disturbance variables when pouring molten metal from a container |
| US6539805B2 (en) | 1994-07-19 | 2003-04-01 | Vesuvius Crucible Company | Liquid metal flow condition detection |
| CN102527969A (en) * | 2010-12-23 | 2012-07-04 | 北京中远通科技有限公司 | Automatic ladle slag outflow detection system and method thereof |
| CN108607968A (en) * | 2016-12-12 | 2018-10-02 | 上海梅山钢铁股份有限公司 | A kind of forecasting procedure of the continuous casting tundish slag based on Lower proterozoic group |
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