JPH0775863A - Automatic detecting device for shortage of powder in mold mouth - Google Patents

Automatic detecting device for shortage of powder in mold mouth

Info

Publication number
JPH0775863A
JPH0775863A JP22236393A JP22236393A JPH0775863A JP H0775863 A JPH0775863 A JP H0775863A JP 22236393 A JP22236393 A JP 22236393A JP 22236393 A JP22236393 A JP 22236393A JP H0775863 A JPH0775863 A JP H0775863A
Authority
JP
Japan
Prior art keywords
image
powder
value
shortage
pixel
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
JP22236393A
Other languages
Japanese (ja)
Other versions
JP2943575B2 (en
Inventor
Masanobu Takahashi
雅伸 高橋
Akira Kazama
彰 風間
Hiroshi Maeda
浩史 前田
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.)
JFE Engineering Corp
Original Assignee
NKK Corp
Nippon Kokan 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 NKK Corp, Nippon Kokan Ltd filed Critical NKK Corp
Priority to JP22236393A priority Critical patent/JP2943575B2/en
Publication of JPH0775863A publication Critical patent/JPH0775863A/en
Application granted granted Critical
Publication of JP2943575B2 publication Critical patent/JP2943575B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
  • Continuous Casting (AREA)

Abstract

PURPOSE:To obtain an automatic detecting device for shortage of powder by eliminating the influence of burning flame of powder, splashed molten steel, etc., and having high reliability. CONSTITUTION:The device is provided with ITV camera 1 to photograph the inside of mold, A/D conversion device 3 to convert the picture signal photographed by ITV camera to the digital signal for each picture element and a min luminance picture synthetic operating means 7, to input the picture signal of each picture element outputted from A/D conversion device, to select a min level one among plural picture elements at the same position among plural picture signals inputted in a specific time, to produce the synthetic picture based on the picture element values at the position. Further the device is provided with the powder shortage detecting means to execute judgment of powder shortage based on the synthetic picture produced by the min. luminance picture synthetic operating means 7.

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、連続鋳造機の鋳型口内
におけるパウダ不足を検知する連続鋳造機の鋳型口内に
おけるパウダ不足自動検知装置に関し、鋳型口内溶鋼表
面からの輻射光の輝度の変化量からパウダ不足を推定す
ることにより、パウダ不足を検知する装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder shortage automatic detection device in a mold mouth of a continuous casting machine for detecting a powder shortage in the mold mouth of a continuous casting machine, and a variation amount of brightness of radiant light from a molten steel surface in the mold mouth. The present invention relates to a device for detecting a powder shortage by estimating a powder shortage from a device.

【0002】[0002]

【従来の技術】連続鋳造機においては、溶鋼と外気とを
遮断し溶鋼の酸化防止を図ると共に、鋳型と鋳片間の潤
滑を図る等のために顆粒または粉末状のパウダが鋳型口
内の溶鋼表面に添加される。従来、パウダの供給は、機
側にいる作業者が目視によりパウダの消費量を判断し、
適宜、適量のパウダ投入を行っていた。しかし、機側は
高温高湿、粉塵等により作業環境は劣悪であり、人間に
よる作業環境として好ましいものではなく、さらに、作
業者は他の作業と並行してパウダ不足の検知およびパウ
ダの投入を行わなければならず、作業条件はさらに過酷
なものであった。
2. Description of the Related Art In a continuous casting machine, a granular or powdery powder is used to prevent the molten steel from oxidizing by blocking the molten steel from the outside air and to lubricate the mold and the slab. Added to the surface. Conventionally, for the supply of powder, an operator on the machine side visually judges the consumption amount of powder,
Appropriate amount of powder was added appropriately. However, on the machine side, the working environment is poor due to high temperature and high humidity, dust, etc., which is not a preferable working environment for human beings.In addition, the worker should detect powder shortage and put in powder in parallel with other work. It had to be done and the working conditions were even more severe.

【0003】一方、パウダ不足の検知が遅れた場合に
は、製品の品質に悪影響を及ぼすのみならず、操業上、
重大な事故につながるブレークアウトを引き起こす危険
性が大きく、パウダ不足検知、投入は適格に行う必要性
が高い。そこで、作業者の負担を少しでも軽減するもの
として、一定周期で定量のパウダを自動投入する方法及
び装置等が開発されているが、これらの方法でも、投入
間隔及び投入量は、経時的な鋳造状況を監視し、監視結
果に基づく判断により決定されるため、作業者は悪環境
の下で鋳型口内の目視監視を続けなければならなかっ
た。
On the other hand, when the detection of the powder shortage is delayed, not only the quality of the product is adversely affected, but also in the operation,
There is a high risk of causing a breakout leading to a serious accident, and it is highly necessary to properly detect and inject powder. Therefore, methods and devices for automatically loading a fixed amount of powder in a fixed cycle have been developed to reduce the burden on the operator as much as possible. Since the casting situation is monitored and it is decided by the judgment based on the monitoring result, the worker had to continue the visual monitoring inside the mold mouth under the bad environment.

【0004】そこで最近では、鋳型口内の監視を人間に
よらず機械によって行うようにしたものとして、例え
ば、放射温度計による鋳型口内の温度分布測定(特開平
3−248752号公報)、赤外線カメラによる温度分
布測定、ITVカメラによる鋳型口内遠隔監視等によっ
てパウダ不足を検知し、適宜パウダ投入を行う方式が提
案されている。
Therefore, recently, as a method of monitoring the inside of the mold mouth by a machine rather than by a human, for example, a temperature distribution measurement inside the mold mouth by a radiation thermometer (Japanese Patent Laid-Open No. 3-248752) and an infrared camera are used. A method has been proposed in which a powder shortage is detected by temperature distribution measurement, remote monitoring of the mold mouth by an ITV camera, and the like, and the powder is appropriately charged.

【0005】[0005]

【発明が解決しようとする課題】しかし、上記の方式で
はパウダの燃焼火炎や溶鋼飛散等に起因する誤検出が発
生し、信頼性あるパウダ不足検知ができないという問題
点があった。ところで、このようなパウダの燃焼火炎や
溶鋼飛散等の影響を除去する装置として、例えば、溶鋼
レベル検出装置に関するものとして特開昭61−132
250号公報に記載されたものがある。しかし、同公報
には溶鋼レベル検出に関してパウダの燃焼火炎や溶鋼飛
散等の影響を除去する技術について開示されているが、
溶鋼表面におけるパウダ不足の検知については何等示唆
されておらず、また、その技術をパウダ不足検知に適用
したとしても、溶鋼面にレベル変動が発生した場合には
十分な検知能力が得られない。このようなことから、パ
ウダの燃焼火炎や溶鋼飛散等の影響を除去して、信頼性
の高いパウダ不足検知技術の開発が要望されていた。
However, the above method has a problem that erroneous detection occurs due to powder combustion flame, molten steel scattering, etc., and reliable powder shortage cannot be detected. By the way, as a device for removing the influence of such powder combustion flame and molten steel scattering, for example, as a device relating to a molten steel level detecting device, Japanese Patent Laid-Open No. 61-132
There is one described in Japanese Patent No. 250. However, while the publication discloses a technique for removing the influence of powder combustion flames, molten steel scattering, etc., regarding molten steel level detection,
Nothing is suggested about detection of powder shortage on the surface of molten steel, and even if the technique is applied to detection of powder shortage, sufficient detection capability cannot be obtained when level fluctuation occurs on the surface of molten steel. Under these circumstances, there has been a demand for the development of a highly reliable powder shortage detection technique that eliminates the effects of powder combustion flames and molten steel scattering.

【0006】本発明は、かかる課題を解決するためにな
されたものであり、パウダの燃焼火炎や溶鋼飛散等の影
響を除去し、高い信頼性を有するパウダ不足自動検知装
置を得ることを目的としている。
The present invention has been made to solve the above problems, and an object of the present invention is to eliminate the effects of powder combustion flame, molten steel scattering, etc., and to obtain a highly reliable powder shortage automatic detection device. There is.

【0007】[0007]

【課題を解決するための手段】本発明に係る鋳型口内パ
ウダ不足自動検知装置は、鋳型口内を撮像する撮像手段
と、該撮像手段によって撮像された画像信号を各画素に
ついてディジタル信号に変換するA/D変換手段と、該
A/D変換手段から出力される各画素の画像信号を入力
し、所定時間の間に入力された複数の画像信号のうち同
一位置における複数の画素について最小レベルのものを
選択してその位置における画素の値とする合成画像を生
成する最小輝度画像合成演算処理手段と、前記合成画像
に基づいてパウダ不足の判断を行うパウダ不足判断手段
とを備えたものである。
An automatic powder shortage detection device in a mold mouth according to the present invention includes an image pickup means for picking up an image of the inside of the mold mouth, and an image signal A picked up by the image pickup means to a digital signal for each pixel. A / D conversion unit and an image signal of each pixel output from the A / D conversion unit are input, and a minimum level of a plurality of pixels at the same position among a plurality of image signals input during a predetermined time Is provided, and minimum brightness image synthesis calculation processing means for generating a synthesized image having a pixel value at that position, and powder shortage determination means for determining powder shortage based on the synthesized image.

【0008】また、本発明に係る他の鋳型口内パウダ不
足自動検知装置は、鋳型口内を撮像する撮像手段と、該
撮像手段によって撮像された画像信号を各画素について
ディジタル信号に変換するA/D変換手段と、該A/D
変換手段から出力される各画素の画像信号を入力し、所
定時間の間に入力された複数の画像信号のうち特定領域
における同一位置における複数の画素について最小レベ
ルのものを選択してその位置における画素の値とする合
成画像を生成する最小輝度画像合成演算処理手段と、前
記合成画像の各画素の値に基づいて前記特定領域の平均
輝度値を算出する平均輝度算出処理手段と、該平均輝度
算出処理手段によって算出された平均輝度値を予め設定
されたパウダ不足検知レベル設定値と比較し、平均輝度
値がパウダ不足検知レベル設定値よりも大きな値になっ
た場合にはパウダ不足警報信号を発する検出値判定処理
手段とを備えたものである。
Further, another apparatus for automatically detecting the powder in the mold mouth according to the present invention is an image pickup means for picking up an image of the inside of the mold mouth, and an A / D for converting the image signal picked up by the image pickup means into a digital signal for each pixel. Conversion means and the A / D
The image signal of each pixel output from the conversion means is input, and among a plurality of image signals input during a predetermined time, the minimum level of a plurality of pixels at the same position in a specific area is selected and the pixel at that position is selected. A minimum brightness image composition calculation processing means for generating a composite image having pixel values, an average brightness calculation processing means for calculating an average brightness value of the specific area based on the value of each pixel of the composite image, and the average brightness. The average luminance value calculated by the calculation processing means is compared with a preset powder shortage detection level set value, and if the average luminance value becomes larger than the powder shortage detection level set value, a powder shortage warning signal is issued. It is provided with a detection value determination processing means for issuing.

【0009】[0009]

【作用】本発明に係る鋳型口内パウダ不足自動検知装置
において、撮像手段は鋳型口内を撮像し、A/D変換手
段は撮像手段によって撮像された画像信号を各画素につ
いてディジタル信号に変換する。また、最小輝度画像合
成演算処理手段は、A/D変換手段から出力される各画
素の画像信号を入力し、所定時間の間に入力された複数
の画像信号のうち同一位置における複数の画素について
最小レベルのものを選択してその位置における画素の値
とする合成画像を生成する。このように最小レベルのも
のを選択することにより、パウダの燃焼火炎や溶鋼飛散
等の影響を除去している。パウダ不足判断手段は燃焼火
炎等の影響が除去された合成画像に基づいてパウダ不足
の判断を行う。
In the apparatus for automatically detecting the powder shortage in the mold mouth according to the present invention, the image pickup means images the inside of the mold mouth, and the A / D conversion means converts the image signal picked up by the image pickup means into a digital signal for each pixel. Further, the minimum luminance image synthesis calculation processing means inputs the image signal of each pixel output from the A / D conversion means, and regarding a plurality of pixels at the same position among a plurality of image signals input during a predetermined time. A minimum level image is selected to generate a composite image having pixel values at that position. By selecting the minimum level in this way, the effects of powder combustion flame and molten steel scattering are eliminated. The powder shortage determination means makes a powder shortage determination based on the composite image from which the influence of the combustion flame or the like has been removed.

【0010】また、本発明に係る他の鋳型口内パウダ不
足自動検知装置において、平均輝度算出処理手段は合成
画像の各画素の値に基づいて特定領域の平均輝度値を算
出し、検出値判定処理手段は平均輝度算出処理手段によ
って算出された平均輝度値を予め設定されたパウダ不足
検知レベル設定値と比較し、平均輝度値がパウダ不足検
知レベル設定値よりも大きな値になった場合にはパウダ
不足警報信号を発する。
Further, in another automatic powder in-mold mouth automatic detection device according to the present invention, the average brightness calculation processing means calculates the average brightness value of the specific area based on the value of each pixel of the composite image, and performs the detection value determination processing. The means compares the average brightness value calculated by the average brightness calculation processing means with a preset powder shortage detection level set value, and when the average brightness value becomes a value larger than the powder shortage detection level set value, the powder is detected. Issue a shortage warning signal.

【0011】[0011]

【実施例】図1は、本発明の一実施例を示す機能ブロッ
ク図であり、図において、1は溶鋼面を含む鋳型口内の
領域を撮像するITVカメラ、3はITVカメラから入
力されるアナログ信号をディジタル信号に変換するA/
D変換処理装置である。5は最小輝度画像合成演算処理
手段であり、図2に示すように、A/D変換処理装置3
から出力される各画素の画像信号を入力し、所定時間の
間に入力された複数の画像信号のうち特定領域における
同一位置における複数の画素について最小レベルのもの
を選択してその位置における画素の値とする合成画像を
生成する。このとき、特定領域及び所定時間は操業条件
により設定される処理パラメータによって決定され、処
理パラメータとしては、パウダの種類に関するもの、輝
度値のしきい値に関するもの、及び処理領域の大きさに
関するものがある。上記の処理により、パウダの燃焼や
溶鋼飛散等による短時間的な輻射光量変化を除去した合
成画像を得ることができる。
DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a functional block diagram showing an embodiment of the present invention. In the figure, 1 is an ITV camera for taking an image of a region inside a mold mouth including a molten steel surface, and 3 is an analog input from the ITV camera. A / to convert signal to digital signal
It is a D conversion processing device. Reference numeral 5 denotes a minimum luminance image synthesis calculation processing means, which is an A / D conversion processing device 3 as shown in FIG.
The image signal of each pixel output from is input, and of the plurality of image signals input during the predetermined time, the minimum level of the plurality of pixels at the same position in the specific area is selected and the pixel at that position is selected. Generate a composite image as a value. At this time, the specific area and the predetermined time are determined by the processing parameters set by the operating conditions, and the processing parameters include those related to the type of powder, those related to the threshold value of the brightness value, and those related to the size of the processing area. is there. By the above processing, it is possible to obtain a composite image in which a short-time change in the amount of radiant light due to powder burning, molten steel scattering, or the like is removed.

【0012】7は平均輝度算出処理手段であり、最小輝
度画像合成演算処理手段5によって合成された合成画像
の各画素の値に基づいて特定領域の平均輝度値を算出す
る。9は検出値判定処理手段であり、検出値判定処理手
段9は、平均輝度算出処理手段7により算出された平均
輝度値を予め設定されたパウダ不足検知レベル設定値と
比較し、平均輝度値がパウダ不足検知レベル設定値より
も大きな値になった場合にはパウダ不足警報信号を発す
る。
Reference numeral 7 denotes an average brightness calculation processing means, which calculates the average brightness value of the specific area based on the value of each pixel of the combined image combined by the minimum brightness image combination calculation processing means 5. Reference numeral 9 denotes a detection value determination processing means. The detection value determination processing means 9 compares the average luminance value calculated by the average luminance calculation processing means 7 with a preset powder shortage detection level setting value, and the average luminance value is When the value becomes larger than the powder shortage detection level set value, a powder shortage alarm signal is issued.

【0013】図3は、本実施例によるパウダ不足検知方
法を説明する説明図である。次に、図3に基づいて小断
面丸ビレット連続鋳造設備での本実施例によるパウダ不
足検知方法を説明する。図において、11は小断面丸ビ
レット連続鋳造機の鋳型(モールド)であり、鋳型11
内にはタンデッシュ13からノズル15を介して溶鋼1
7が鋳込まれ、鋳型11により冷却された溶鋼を徐々に
下方に引き抜くことにより、鋳片19が連続的に形成さ
れる。21は鋳型11口内溶鋼表面に添加された顆粒ま
たは粉末状のパウダであり、パウダ21は連続鋳造中に
鋳造と共に消費されるため、パウダ21が消費されると
溶鋼17の表面から発せられる輻射光量が増加する。そ
のため、輻射光量が一定値以上になるとパウダ21の供
給を行う必要がある。
FIG. 3 is an explanatory view for explaining the powder shortage detection method according to this embodiment. Next, a powder shortage detection method according to this embodiment in a small-section round billet continuous casting facility will be described with reference to FIG. In the figure, 11 is a mold of a small-section round billet continuous casting machine.
Inside the tundish 13 through the nozzle 15 molten steel 1
7 is cast, and the molten steel cooled by the mold 11 is gradually drawn downward, so that the slab 19 is continuously formed. 21 is a granular or powdery powder added to the molten steel surface in the mouth of the mold 11. The powder 21 is consumed with the casting during continuous casting. Therefore, when the powder 21 is consumed, the amount of radiant light emitted from the surface of the molten steel 17 is consumed. Will increase. Therefore, it is necessary to supply the powder 21 when the amount of radiated light exceeds a certain value.

【0014】鋳型口内におけるパウダ21の状況は、I
TVカメラ1により、非接触かつ連続的に撮像され、画
像処理装置2に実時間で入力される。ITVカメラ1に
よって撮像された画像データはA/D変換処理装置3に
よって、ディジタルデータに変換され、操業条件により
設定される処理パラメータに基づき、最小輝度画像合成
演算処理手段5によって最小輝度画像合成演算処理が施
こされる。図4は最小輝度画像合成演算処理によって、
火炎像を除去した画像の説明をする説明図である。図4
において、31は原画像、33は原画像31の模式図、
35は原画像31に対して最小輝度画像合成演算処理を
行って生成された合成画像である。合成画像35から明
らかなように、最小輝度画像合成演算処理によって、火
炎像がほぼ完全に除去されている。
The condition of the powder 21 in the mold mouth is I
The TV camera 1 continuously captures images in a non-contact manner and inputs them to the image processing device 2 in real time. The image data picked up by the ITV camera 1 is converted into digital data by the A / D conversion processing device 3, and the minimum luminance image synthesis calculation processing means 5 performs the minimum luminance image synthesis calculation based on the processing parameter set by the operating condition. Processing is applied. FIG. 4 shows the minimum brightness image synthesis calculation process.
It is explanatory drawing explaining the image which removed the flame image. Figure 4
, 31 is an original image, 33 is a schematic diagram of the original image 31,
Reference numeral 35 is a composite image generated by performing the minimum luminance image composition calculation processing on the original image 31. As is clear from the combined image 35, the flame image is almost completely removed by the minimum luminance image combination calculation processing.

【0015】次に、最小輝度画像合成演算処理によって
生成された合成画像の各画素の値に基づいて、平均輝度
算出手段7によって平均輝度値が算出され、算出された
平均輝度値はさらに、検出値判定処理手段9によって予
め設定されたパウダ不足検知レベル設定値と比較され
る。図5は検出された平均輝度値を縦軸にとり、時間を
横軸にとって表した平均輝度値の時間経過による変化状
態を示すグラフであり、グラフ中時間軸に平行に引いた
破線はパウダ不足検知レベル設定値を示している。比較
された結果、平均輝度値がパウダ不足検知レベル設定値
以上になった場合にはパウダ不足警報信号を発する。こ
の図5の例では、パウダ不足警報信号が発せられると、
直ちにパウダが供給されている。
Next, the average brightness calculating means 7 calculates the average brightness value based on the value of each pixel of the combined image generated by the minimum brightness image combining calculation processing, and the calculated average brightness value is further detected. The value determination processing means 9 compares it with a preset powder shortage detection level setting value. FIG. 5 is a graph showing the state of change of the average luminance value with time, with the detected average luminance value on the vertical axis and time on the horizontal axis. The broken line drawn parallel to the time axis in the graph indicates powder shortage detection. Indicates the level setting value. As a result of the comparison, if the average luminance value is equal to or higher than the powder shortage detection level set value, a powder shortage alarm signal is issued. In the example of FIG. 5, when the powder shortage warning signal is issued,
Powder is being supplied immediately.

【0016】以上の検知方法により、溶鋼17の表面上
に添加されるパウダ21が鋳造とともに消費され、溶鋼
17表面から発せられる輻射光量が増加した場合に、パ
ウダ21の燃焼や溶鋼飛散等による短時間的な輻射光量
変化の影響を除去しつつ(図4参照)、溶鋼17の表面
からの輻射光量の増減量のみを測定することができ、パ
ウダ21の不足を自動検出することができる。また、本
実施例の装置をパウダ自動供給装置の視覚センサとして
利用することによって、適切なタイミングで適量のパウ
ダ供給ができるパウダ自動供給装置を得ることができ
る。
By the above detection method, when the powder 21 added on the surface of the molten steel 17 is consumed with casting and the amount of radiant light emitted from the surface of the molten steel 17 increases, shortage due to combustion of the powder 21 or scattering of molten steel occurs. It is possible to measure only the amount of increase or decrease in the amount of radiant light from the surface of the molten steel 17 while eliminating the effect of changes in the amount of radiant light over time (see FIG. 4), and it is possible to automatically detect the shortage of the powder 21. Further, by using the apparatus of this embodiment as a visual sensor of the powder automatic feeder, it is possible to obtain the powder automatic feeder which can supply an appropriate amount of powder at an appropriate timing.

【0017】なお、本実施例では合成画像の各画素の値
に基づいて平均輝度値を算出し、この平均輝度値とパウ
ダ不足検知レベル設定値とを比較してパウダ不足を判断
する例を示したが、平均輝度値を算出することなく合成
画像に基づいてパウダ不足を判断することも可能であ
る。また、本実施例ではITVカメラにより撮像される
鋳型口内の全画像情報の中から特定領域をきめて画像処
理をする例を示したが、本発明はこれに限られるもので
はなく、ITVカメラにより観察される鋳型の画像情報
の内、ある注目する領域の中から特定領域を決めて画像
処理を行ってもよい。
In this embodiment, an average brightness value is calculated based on the value of each pixel of the composite image, and the average brightness value is compared with the powder shortage detection level setting value to judge the powder shortage. However, it is possible to determine the powder shortage based on the composite image without calculating the average luminance value. Further, in the present embodiment, an example has been shown in which a specific region is determined from all the image information in the mold mouth imaged by the ITV camera to perform image processing, but the present invention is not limited to this, and the ITV camera is used. Of the image information of the observed template, a specific region may be determined from a certain region of interest and image processing may be performed.

【0018】なお、注目する領域はパウダ表面での輻射
光量の変化を直接観察できる領域でなてもよく、例え
ば、鋳型口内壁に反射・映り込む輻射光量を観察・測定
してもよい。鋳型口内壁を観察・測定することにより、
周辺設備等により生ずる死角やITVカメラの設置位置
により直接観察できない位置で発生するパウダの不足
を、その発生位置にかかわらず検知することができる。
また、観察に用いるITVカメラは、可視光領域に限ら
ず赤外線領域に感度をもつようなテレビカメラを用いて
もよい。
The region of interest may be a region in which changes in the amount of radiant light on the surface of the powder can be directly observed, and for example, the amount of radiant light reflected and reflected on the inner wall of the mold mouth may be observed and measured. By observing and measuring the inner wall of the mold mouth,
It is possible to detect a blind spot caused by peripheral equipment or the like, or a powder shortage occurring at a position where direct observation is not possible due to the installation position of the ITV camera, regardless of the generation position.
Further, the ITV camera used for observation may be a television camera having sensitivity in the infrared region as well as the visible light region.

【0019】[0019]

【発明の効果】以上詳細に説明したように、本発明によ
れば、所定時間の間に入力された複数の画像信号のうち
同一位置における複数の画素について最小レベルのもの
から合成画像を生成し、この合成画像に基づいてパウダ
不足の判断を行うようにしたので、パウダの燃焼火炎や
溶鋼飛散等の影響を除去することができ、高い精度でパ
ウダ不足を検知することができる。
As described in detail above, according to the present invention, a composite image is generated from the minimum level of a plurality of pixels at the same position among a plurality of image signals input during a predetermined time. Since the powder shortage is determined based on this composite image, it is possible to remove the influence of the powder combustion flame, the molten steel scattering, and the like, and it is possible to detect the powder shortage with high accuracy.

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

【図1】本発明の一実施例を示す機能ブロック図であ
る。
FIG. 1 is a functional block diagram showing an embodiment of the present invention.

【図2】本発明の一実施例における最小輝度画像合成演
算処理を説明する説明図である。
FIG. 2 is an explanatory diagram illustrating a minimum brightness image synthesis calculation process according to an embodiment of the present invention.

【図3】本発明の一実施例におけるパウダ不足検知方法
を説明する説明図である。
FIG. 3 is an explanatory diagram illustrating a powder shortage detection method according to an embodiment of the present invention.

【図4】本発明の一実施例における最小輝度画像合成演
算処理によって、火炎像を除去した画像の説明をする説
明図である。
FIG. 4 is an explanatory diagram illustrating an image from which a flame image has been removed by the minimum-luminance image composition calculation processing according to the embodiment of the present invention.

【図5】本発明の一実施例における平均輝度算出手段に
よって算出された平均輝度値の時間経過による変化状態
を示すグラフである。
FIG. 5 is a graph showing a change state of an average luminance value calculated by an average luminance calculating means in one embodiment of the present invention with the passage of time.

【符号の説明】[Explanation of symbols]

1 ITVカメラ 3 A/D変換処理装置 5 最小輝度画像合成演算処理手段 7 平均輝度算出処理手段 9 検出値判定処理手段 DESCRIPTION OF SYMBOLS 1 ITV camera 3 A / D conversion processing device 5 Minimum brightness image synthesis calculation processing means 7 Average brightness calculation processing means 9 Detection value determination processing means

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 鋳型口内を撮像する撮像手段と、 該撮像手段によって撮像された画像信号を各画素につい
てディジタル信号に変換するA/D変換手段と、 該A/D変換手段から出力される各画素の画像信号を入
力し、所定時間の間に入力された複数の画像信号のうち
同一位置における複数の画素について最小レベルのもの
を選択してその位置における画素の値とする合成画像を
生成する最小輝度画像合成演算処理手段と、 前記合成画像に基づいてパウダ不足の判断を行うパウダ
不足判断手段とを備えたことを特徴とする鋳型口内パウ
ダ不足自動検知装置。
1. An image pickup means for picking up an image of the inside of a mold mouth, an A / D conversion means for converting an image signal picked up by the image pickup means into a digital signal for each pixel, and each output from the A / D conversion means. An image signal of a pixel is input, a minimum level of a plurality of pixels at the same position is selected from a plurality of image signals input during a predetermined time, and a composite image having a pixel value at that position is generated. An automatic powder shortage detection device in a mold mouth, comprising: a minimum brightness image synthesis calculation processing means; and a powder shortage determination means for determining a powder shortage based on the synthetic image.
【請求項2】 鋳型口内を撮像する撮像手段と、 該撮像手段によって撮像された画像信号を各画素につい
てディジタル信号に変換するA/D変換手段と、 該A/D変換手段から出力される各画素の画像信号を入
力し、所定時間の間に入力された複数の画像信号のうち
特定領域における同一位置における複数の画素について
最小レベルのものを選択してその位置における画素の値
とする合成画像を生成する最小輝度画像合成演算処理手
段と、 前記合成画像の各画素の値に基づいて前記特定領域の平
均輝度値を算出する平均輝度算出処理手段と、 該平均輝度算出処理手段によって算出された平均輝度値
を予め設定されたパウダ不足検知レベル設定値と比較
し、平均輝度値がパウダ不足検知レベル設定値よりも大
きな値になった場合にはパウダ不足警報信号を発する検
出値判定処理手段とを備えたことを特徴とする鋳型口内
パウダ不足自動検知装置。
2. An image pickup means for picking up an image of the inside of the mold mouth, an A / D conversion means for converting an image signal picked up by the image pickup means into a digital signal for each pixel, and each output from the A / D conversion means. A composite image that receives the image signal of a pixel, selects the minimum level of a plurality of pixels at the same position in a specific region from among the plurality of image signals input during a predetermined time, and sets it as the value of the pixel at that position A minimum brightness image combination calculation processing means, an average brightness calculation processing means for calculating an average brightness value of the specific area based on the value of each pixel of the composite image, and an average brightness calculation processing means. The average luminance value is compared with a preset powder shortage detection level setting value, and if the average luminance value is larger than the powder shortage detection level setting value, the powder is not detected. Mold mouth powder lack automatic detection device is characterized in that a detection value determination processing unit for issuing an alarm signal.
JP22236393A 1993-09-07 1993-09-07 Automatic detection device for powder shortage in mold mouth Expired - Fee Related JP2943575B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP22236393A JP2943575B2 (en) 1993-09-07 1993-09-07 Automatic detection device for powder shortage in mold mouth

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP22236393A JP2943575B2 (en) 1993-09-07 1993-09-07 Automatic detection device for powder shortage in mold mouth

Publications (2)

Publication Number Publication Date
JPH0775863A true JPH0775863A (en) 1995-03-20
JP2943575B2 JP2943575B2 (en) 1999-08-30

Family

ID=16781176

Family Applications (1)

Application Number Title Priority Date Filing Date
JP22236393A Expired - Fee Related JP2943575B2 (en) 1993-09-07 1993-09-07 Automatic detection device for powder shortage in mold mouth

Country Status (1)

Country Link
JP (1) JP2943575B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010207843A (en) * 2009-03-09 2010-09-24 Nippon Steel Corp Continuous casting method of molten metal

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010207843A (en) * 2009-03-09 2010-09-24 Nippon Steel Corp Continuous casting method of molten metal

Also Published As

Publication number Publication date
JP2943575B2 (en) 1999-08-30

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