JP3566922B2 - Electromagnetic flow rate sensor for measuring molten metal flow rate - Google Patents
Electromagnetic flow rate sensor for measuring molten metal flow rate Download PDFInfo
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- JP3566922B2 JP3566922B2 JP2000343718A JP2000343718A JP3566922B2 JP 3566922 B2 JP3566922 B2 JP 3566922B2 JP 2000343718 A JP2000343718 A JP 2000343718A JP 2000343718 A JP2000343718 A JP 2000343718A JP 3566922 B2 JP3566922 B2 JP 3566922B2
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- coil
- molten metal
- flow rate
- electromagnetic
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- 239000002184 metal Substances 0.000 title claims description 24
- 229910052751 metal Inorganic materials 0.000 title claims description 24
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 16
- 230000005284 excitation Effects 0.000 claims description 15
- 238000001514 detection method Methods 0.000 claims description 14
- 238000009749 continuous casting Methods 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
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Description
【０００１】
【発明の属する技術分野】
本発明は、溶融金属流速測定用電磁流速センサに関し、特に、励磁コイルを鉄芯を有しない空芯コイルで構成することにより、外部直流磁場の影響を回避することを可能として、高精度に溶融金属流の流速を測定することが可能となるようにするための新規な改良に関する。
【０００２】
【従来の技術】
従来、用いられていたこの種の溶融金属流速測定用電磁流速センサとしては、特開平９−３３５５４号公報及び特開２０００−１６２２２８号公報の構成を挙げることができる。すなわち、ここでは図示を省略しているが、励磁コイルには鉄芯が用いられ、鉄芯をコアとし、このコアの外周に励磁コイルが巻回されて構成されていた。
【０００３】
【発明が解決しようとする課題】
従来の溶融金属流速測定用電磁流速センサは、以上のように構成されていたため、次のような課題が存在していた。すなわち、近年、鉄鋼の連続鋳造鋳型に、電磁攪拌、電磁ブレーキ等の各種電磁装置が取り付けられ、鋳型内の溶鋼の流動を制御する技術が一般に採用されつつある。
従って、これらの電磁装置を効果的に利用するためには、リアルタイムの状態で、鋳型内溶鋼流動の状況を電磁流速センサによって非接触で把握することが重要である。
しかしながら、実際には、従来の電磁流速センサの励磁コイルには鉄芯が設けられていたため、前述の各種電磁装置が作動した場合に発生する直流磁場によってこの鉄芯が磁化され、この鉄芯の磁化によって励磁コイルによる励磁以上に鉄芯が磁化され、その結果、電磁流速センサの出力が大きく変動し、正確な流速測定が不可能となり、各種電磁装置の帰還制御も不正確なものとなっていた。
【０００４】
本発明は、以上のような課題を解決するためになされたもので、特に、励磁コイルを鉄芯を有しない空芯コイルで構成することにより、外部直流磁場の影響を回避することを可能として、高精度に溶融金属流の流速を測定することが可能となるようにした溶融金属流速測定用電磁流速センサを提供することを目的とする。
【０００５】
【課題を解決するための手段】
本発明による溶融金属流速測定用電磁流速センサは、直流磁場を発生する電磁装置が取り付けられた連続鋳造鋳型内の溶融金属流の流速を非接触状態で測定するため、励磁コイル及び検知コイルを有する溶融金属流速測定用電磁流速センサにおいて、前記溶融金属流の溶融金属表面に磁場を形成させるための前記励磁コイルは、鉄芯を有しない１個の円筒 状の空芯コイルよりなり、前記検知コイルは、平面形状が四角状をなす扁平型の一対のコイル部よりなると共に前記励磁コイルの下方に位置し、前記検知コイルは長方形状の支持枠によって支持され、前記支持枠が前記励磁コイルの下面に接続されていることにより前記励磁コイルと検知コイルとは一体状に結合され、前記検知コイルの横幅は前記励磁コイルの直径と同一とした構成である。
【０００６】
【発明の実施の形態】
以下、図面と共に本発明による溶融金属流速測定用電磁流速センサの好適な実施の形態について説明する。
図１及び図２は本発明による電磁流速センサ１を示す平面構成図及び正面図であり、図１及び図２において符号２で示されるものは全体形状が筒形をなすと共に所要の高さＨ及び直径Ｄを有する励磁コイルであり、この励磁コイル２は従来の鉄芯を有する構成とは異なり、鉄芯を有しない１個の円筒状の空芯コイルで構成されていると共に、周知のように、従来と同様の直流磁場を発生する電磁装置が取り付けられた連続鋳造鋳型内の溶融金属流の溶融金属表面に磁場を形成させる作用を有している。
【０００７】
前記励磁コイル２の下方位置には、平面形状が四角状をなす扁平型の一対のコイル部３ａ、３ｂからなる検知コイル３が設けられている。この各コイル部３ａ、３ｂは互いに一体状かつ長手状に結合されており、この検知コイル３の横幅Ｗは前記直径Ｄと同一に形成されている。
前記検知コイル３は、長方形状の支持枠４によって支持され、この支持枠４が励磁コイル２の下面に接続されていることにより、前記励磁コイル２と検知コイル３とは一体状に結合されて電磁流速センサ５が構成されている。
【０００８】
次に、前述の空芯形の図１及び図２で示される形態の電磁流速センサ１と従来の鉄芯形の電磁流速センサ１とを用いて、前述の従来例の課題の事項の中で指摘した外部磁場の影響の調査について述べる。
まず、図３で示されるように、電磁流速センサ１（なお、図３では従来構成の電磁流速センサを設置した場合を示している）の近傍に外部磁場を印加するための実験用リング状コイル１０を配設し、前記電磁流速センサ１の励磁コイル２（鉄芯２Ａを有する）は励磁電源１１に接続されると共に、検知コイル３はレコーダ１２に接続された演算器１３に接続されている。また、前記実験用リング状コイル１０は直流電源１４に接続されている。
【０００９】
前述の構成において、直流電源１４からの電源を実験用リング状コイル１０に印加し、励磁電源１１を励磁コイル２に印加すると、実験用リング状コイル１０から発生する直流磁場と励磁コイル２からの磁場とが平行になるように構成されているため、励磁コイル２に電流を流しつつ検知コイル３から出力される出力信号３Ａを演算器１３を介してレコーダ１２で記録する。
従って、実験用リング状コイル１０に流した電流値毎に出力信号３Ａの記録をレコーダ１２によって行った。なお、図３の従来形の鉄芯形励磁コイル２は比較例で、本発明による空芯形の励磁コイル２を入れ替えて実験した。
この実験の結果、図４で示されるように、外部電流磁場印加電流を徐々に変化させた場合の検知コイル３の出力信号３Ａの変動は、比較例鉄芯形の電磁流速センサ１の出力信号３Ａが、実験用リング状コイルにかかる電流値の変化と共に大きく変動し、また、電流増大時と減少時に異なる値を示す、いわゆるヒステリシスループを描いたのに対し、本発明の空芯形の電磁流速センサ１の信号は、実験用リング状コイル１０の電流変化に拘わらず、ほぼ一定値を示している。
【００１０】
前述の実験結果により、本発明による電磁流速センサ１を用いた場合は、直流外部磁場の存在下でも影響を受けることなく、高精度の流速測定で可能となる。
なお、前述の電磁流速センサ１による溶融金属流の流速検出については、前述の従来例の事項で列挙した各公報等により周知であるため、ここでは省略している。
【００１１】
【発明の効果】
本発明による溶融金属流速測定用電磁流速センサは、以上のように構成されているため、次のような効果を得ることができる。
すなわち、励磁コイルが空芯構造で構成されているため、外部からの直流磁場による影響をなくし、検知コイルからの出力信号の精度を従来よりも大幅に向上させることができる。
また、励磁コイルに鉄芯が設けられていないため、電磁流速センサ自体の大きさや重量を少なくすることができ、連続鋳造鋳型への取付けを容易化することができる。
【図面の簡単な説明】
【図１】本発明による溶融金属流速測定用電磁流速センサを示す平面図である。
【図２】図１の正面断面図である。
【図３】外部磁場の影響を調査する方法を示す構成図である。
【図４】図３の方法による本発明と従来の電磁流速センサを用いた外部磁場の影響調査結果を示す特性図である。
【符号の説明】
２ 励磁コイル
３ 検知コイル
４ 支持枠
Ｄ 直径
Ｗ 横幅[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an electromagnetic flow rate sensor for measuring molten metal flow rate, and in particular, by configuring an excitation coil with an air-core coil having no iron core, it is possible to avoid the influence of an external DC magnetic field and to perform high-precision melting. The present invention relates to a new improvement for making it possible to measure the flow velocity of a metal stream.
[0002]
[Prior art]
Conventionally, as this kind of electromagnetic flow sensor for measuring the flow rate of a molten metal, the configuration of JP-A-9-33554 and JP-A-2000-162228 can be mentioned. That is, although not shown here, an iron core is used as the exciting coil, and the iron core is used as a core, and the exciting coil is wound around the outer periphery of the core.
[0003]
[Problems to be solved by the invention]
Since the conventional electromagnetic flow rate sensor for molten metal flow rate measurement was configured as described above, the following problems existed. That is, in recent years, various electromagnetic devices such as electromagnetic stirring and an electromagnetic brake have been attached to a steel continuous casting mold, and a technique for controlling the flow of molten steel in the mold has been generally adopted.
Therefore, in order to use these electromagnetic devices effectively, it is important to grasp the state of the molten steel flow in the mold in a non-contact manner in a real-time manner using an electromagnetic flow rate sensor.
However, in practice, an iron core is provided in the excitation coil of the conventional electromagnetic flow sensor, and the iron core is magnetized by a DC magnetic field generated when the above-described various electromagnetic devices operate, and the iron core is magnetized. Due to the magnetization, the iron core is magnetized more than the excitation by the excitation coil.As a result, the output of the electromagnetic flow velocity sensor fluctuates greatly, so that accurate flow velocity measurement becomes impossible, and the feedback control of various electromagnetic devices becomes inaccurate. Was.
[0004]
The present invention has been made to solve the above problems, and in particular, by configuring the excitation coil with an air-core coil having no iron core, it is possible to avoid the influence of an external DC magnetic field. It is another object of the present invention to provide a molten metal flow velocity measuring electromagnetic flow sensor capable of measuring the flow velocity of a molten metal flow with high accuracy.
[0005]
[Means for Solving the Problems]
The molten metal flow velocity sensor for measuring molten metal flow velocity according to the present invention has an excitation coil and a detection coil in order to measure a flow velocity of a molten metal flow in a continuous casting mold equipped with an electromagnetic device for generating a DC magnetic field in a non-contact state. the electromagnetic flow rate sensor for molten metal flow rate measurement, the exciting coil for forming a magnetic field to the molten metal surface of the molten metal stream is made of one of a cylindrical air-core coil having no iron core, said sensing coil Is formed of a pair of flat-shaped coil portions having a quadrangular planar shape, and is located below the exciting coil. The detecting coil is supported by a rectangular supporting frame, and the supporting frame is a lower surface of the exciting coil. the said exciting coil and the detection coil by being connected integrally coupled to form the configuration der lateral width that is the same as the diameter of the exciting coil of the sensing coil .
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a preferred embodiment of an electromagnetic flow sensor for measuring the flow rate of a molten metal according to the present invention will be described with reference to the drawings.
FIGS. 1 and 2 are a plan view and a front view, respectively, showing an electromagnetic flow sensor 1 according to the present invention. In FIGS. 1 and 2, the reference numeral 2 in FIG. 1 and FIG. And an exciting coil having a diameter D. Unlike the conventional configuration having an iron core, the exciting coil 2 is formed of a single cylindrical air-core coil having no iron core. In addition, it has a function of forming a magnetic field on the surface of a molten metal of a molten metal flow in a continuous casting mold to which an electromagnetic device for generating a DC magnetic field as in the related art is attached .
[0007]
At a position below the exciting coil 2, a detection coil 3 including a pair of
The detection coil 3 is supported by a rectangular support frame 4, and since the support frame 4 is connected to the lower surface of the excitation coil 2, the excitation coil 2 and the detection coil 3 are integrally connected. An electromagnetic flow sensor 5 is configured.
[0008]
Next, using the air-core type electromagnetic flow rate sensor 1 shown in FIGS. 1 and 2 and the conventional iron-core type electromagnetic flow rate sensor 1 to solve the problems of the conventional example described above. The investigation of the influence of the external magnetic field pointed out is described.
First, as shown in FIG. 3, an experimental ring-shaped coil for applying an external magnetic field in the vicinity of the electromagnetic flow sensor 1 (FIG. 3 shows a case where a conventional electromagnetic flow sensor is installed). 10, an exciting coil 2 (having an
[0009]
In the above-described configuration, when the power from the DC power supply 14 is applied to the experimental ring-shaped coil 10 and the
Therefore, the recording of the output signal 3A was performed by the
As a result of this experiment, as shown in FIG. 4, the variation of the output signal 3A of the detection coil 3 when the external current magnetic field applied current was gradually changed was the output signal of the iron core type electromagnetic flow sensor 1 of the comparative example. 3A shows a so-called hysteresis loop, which fluctuates greatly with a change in the current value applied to the experimental ring-shaped coil, and shows different values when the current increases and decreases. The signal of the flow velocity sensor 1 shows a substantially constant value irrespective of a change in the current of the experimental ring-shaped coil 10.
[0010]
According to the above experimental results, when the electromagnetic flow sensor 1 according to the present invention is used, the flow velocity can be measured with high accuracy without being affected even in the presence of a DC external magnetic field.
The detection of the flow velocity of the molten metal flow by the above-mentioned electromagnetic flow velocity sensor 1 is well-known in each of the publications listed in the above-mentioned conventional examples, and is omitted here.
[0011]
【The invention's effect】
Since the molten metal flow velocity measuring electromagnetic flow rate sensor according to the present invention is configured as described above, the following effects can be obtained.
That is, since the excitation coil has an air-core structure, the influence of the external DC magnetic field can be eliminated, and the accuracy of the output signal from the detection coil can be greatly improved as compared with the related art.
Further, since the exciting coil is not provided with the iron core, the size and weight of the electromagnetic flow sensor itself can be reduced, and the mounting to the continuous casting mold can be facilitated.
[Brief description of the drawings]
FIG. 1 is a plan view showing an electromagnetic flow sensor for measuring the flow velocity of a molten metal according to the present invention.
FIG. 2 is a front sectional view of FIG.
FIG. 3 is a configuration diagram showing a method for investigating the influence of an external magnetic field.
FIG. 4 is a characteristic diagram showing the results of an investigation on the influence of an external magnetic field using the present invention and the conventional electromagnetic flow sensor by the method of FIG. 3;
[Explanation of symbols]
2 Excitation coil 3 Detection coil 4 Support frame D Diameter W Width
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000343718A JP3566922B2 (en) | 2000-11-10 | 2000-11-10 | Electromagnetic flow rate sensor for measuring molten metal flow rate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000343718A JP3566922B2 (en) | 2000-11-10 | 2000-11-10 | Electromagnetic flow rate sensor for measuring molten metal flow rate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002148274A JP2002148274A (en) | 2002-05-22 |
| JP3566922B2 true JP3566922B2 (en) | 2004-09-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000343718A Expired - Fee Related JP3566922B2 (en) | 2000-11-10 | 2000-11-10 | Electromagnetic flow rate sensor for measuring molten metal flow rate |
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| Country | Link |
|---|---|
| JP (1) | JP3566922B2 (en) |
-
2000
- 2000-11-10 JP JP2000343718A patent/JP3566922B2/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| JP2002148274A (en) | 2002-05-22 |
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Free format text: JAPANESE INTERMEDIATE CODE: R250 |
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| LAPS | Cancellation because of no payment of annual fees |