JPH0533039A - Electric heater - Google Patents
Electric heaterInfo
- Publication number
- JPH0533039A JPH0533039A JP3212690A JP21269091A JPH0533039A JP H0533039 A JPH0533039 A JP H0533039A JP 3212690 A JP3212690 A JP 3212690A JP 21269091 A JP21269091 A JP 21269091A JP H0533039 A JPH0533039 A JP H0533039A
- Authority
- JP
- Japan
- Prior art keywords
- heated
- constant
- electric heating
- frequency
- heating device
- 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
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、大量生産される導電性
を有する被加熱材を連続的に高速送給しつつ、通電加熱
する通電加熱装置、たとえば鋼材の亜鉛メッキのための
予熱処理として加熱する通電加熱装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric heating apparatus for electrically heating a mass-produced electrically conductive material to be continuously fed at a high speed, for example, as a preheat treatment for galvanizing steel materials. The present invention relates to an electric heating device for heating.
【０００２】[0002]
【従来の技術】導電性を有する被加熱材、たとえば鋼材
を、予熱、焼きなまし、焼き入れ等の各種目的のために
連続的に高速送給しつつ被加熱材に交流を通電し、通電
加熱によって被加熱材を加熱する装置が知られている。2. Description of the Related Art A material to be heated having electrical conductivity, for example, a steel material, is continuously fed at high speed for various purposes such as preheating, annealing, and quenching, and an alternating current is applied to the material to be heated, and the A device for heating a material to be heated is known.
【０００３】このような加熱装置として、被加熱材の送
り通路において所定の間隔を隔てて被加熱材を挟む導電
性のロール電極が２組設けられ、２組のロール電極の間
において被加熱材の周囲に環状トランスを配置したもの
が知られている。この装置においては、環状トランスの
環内が被加熱材の送り通路となるように形成され、環状
トランスに電源から一次電圧が印加されることにより被
加熱材に２次電圧が誘起されて被加熱材が通電加熱され
るものである。As such a heating device, two sets of electrically conductive roll electrodes sandwiching the material to be heated are provided at predetermined intervals in the feed passage for the material to be heated, and the material to be heated is placed between the two sets of roll electrodes. It is known that a ring transformer is arranged around the. In this device, the inside of the annular transformer is formed so as to serve as a feed passage for the material to be heated, and a secondary voltage is induced in the material to be heated by applying a primary voltage from the power source to the annular transformer. The material is electrically heated.
【０００４】このような通電加熱装置においては、被加
熱材のインピーダンスおよび断面積に応じて環状トラン
スに供給する交流の周波数を変化させることが知られて
いる。たとえば被加熱材が低インピーダンスの材質の場
合または断面積が大きい場合には周波数を低く設定し、
被加熱材が高インピーダンスの材質の場合または断面積
が小さい場合には周波数を高く設定することによって、
被加熱材における電流密度を均一化し、被加熱材の断面
における均一加熱を図るようにしている。In such an electric heating apparatus, it is known that the frequency of the alternating current supplied to the annular transformer is changed according to the impedance and cross-sectional area of the material to be heated. For example, if the material to be heated is of low impedance or has a large cross-sectional area, set the frequency low,
If the material to be heated is a high impedance material or the cross-sectional area is small, by setting the frequency high,
The current density in the heated material is made uniform so that the cross section of the heated material is uniformly heated.
【０００５】[0005]
【発明が解決しようとする課題】しかし、被加熱材が高
インピーダンスの材質の場合でも、透磁率の大きい材
質、たとえば炭素鋼、低合金鋼等の場合には、インダク
タンス分が大きくなるため、周波数が高いと被加熱材の
断面における加熱にばらつきが生じる。また、同一の断
面積の被加熱材においても板厚が大きい場合には、周波
数が高いと断面における加熱にばらつきが生じる。However, even if the material to be heated is a material with high impedance, in the case of a material with a large magnetic permeability, such as carbon steel or low alloy steel, the inductance becomes large, so that the frequency When the value is high, the heating of the cross section of the material to be heated varies. Further, when the material to be heated having the same cross-sectional area has a large plate thickness, the heating in the cross-section varies when the frequency is high.
【０００６】本発明は、上記のような問題点を解消し、
被加熱材、特に長尺の帯材の断面における均一加熱を可
能にする通電加熱装置を提供することを目的とする。The present invention solves the above problems,
It is an object of the present invention to provide an electric heating device that enables uniform heating in a cross section of a material to be heated, particularly a long strip material.
【０００７】[0007]
【課題を解決するための手段】本発明の通電加熱装置
は、連続送給される被加熱材を、被加熱材の送り通路の
入り側に配置されたロール電極に接触させるとともに、
被加熱材の出側に設けられたロール電極または金属浴に
接触させることにより、通電加熱するものであり、入り
側のロール電極と出側のロール電極または金属浴との間
に環状トランスが配置され、環状トランスの環内が被加
熱材の通路となっている。According to the present invention, there is provided an electric heating apparatus in which a material to be continuously fed is brought into contact with a roll electrode arranged on the inlet side of a feed passage of the material to be heated,
It is heated electrically by contacting it with a roll electrode or metal bath provided on the output side of the material to be heated, and an annular transformer is arranged between the roll electrode on the input side and the roll electrode on the output side or the metal bath. The inside of the annular transformer serves as a passage for the material to be heated.
【０００８】環状トランスに供給される交流の周波数ｆ
を設定する周波数設定手段は、周波数ｆを、前記被加熱
材の材質に応じて定められる第１の定数Ｋ1 、第２の定
数Ｋ2 および前記被加熱材の板厚ｗに対して、ｆ≦Ｋ1
＋Ｋ2 ／ｗを満たすように設定する。Frequency f of alternating current supplied to the annular transformer
The frequency setting means sets the frequency f to f ≦ K1 with respect to the first constant K1, the second constant K2 and the plate thickness w of the heated material, which are determined according to the material of the heated material.
Set to satisfy + K2 / w.
【０００９】[0009]
【作用】本発明によれば、環状トランスに電圧が印加さ
れることにより、被加熱材に２次電圧が誘起され、被加
熱材が通電加熱される。環状トランスに供給される交流
の周波数ｆは、被加熱材の材質、特に透磁率及び導電率
を考慮して定められる第１の定数Ｋ1 、第２の定数Ｋ2
および前記被加熱材の板厚ｗに応じて設定されるから、
被加熱材が透磁率の大きい材質の場合、導電率の小さい
材質の場合または板厚の厚い材料の場合には周波数を低
く設定して断面における加熱のばらつきをなくすことが
できる。According to the present invention, by applying a voltage to the annular transformer, a secondary voltage is induced in the material to be heated and the material to be heated is electrically heated. The frequency f of the alternating current supplied to the annular transformer is determined by considering the material of the material to be heated, particularly the magnetic permeability and the electric conductivity, and the first constant K1 and the second constant K2.
And since it is set according to the plate thickness w of the material to be heated,
When the material to be heated has a high magnetic permeability, a material having a low electrical conductivity, or a material having a large plate thickness, the frequency can be set low to eliminate variations in heating in the cross section.
【００１０】[0010]
【実施例】図２は本発明の通電加熱装置の機構の一実施
例を示す図である。被加熱材Ｗの送り通路Ｌの入り側に
は、ゴム材等がライニングされた補助ロールＲ１と導電
性のロール電極Ｒ２とが、被加熱材Ｗを挟んで対向して
配置されている。出側にも同様に補助ロールＲ３とロー
ル電極Ｒ４が対向して設けられている。被加熱材Ｗは、
たとえば鋼板などの導電性を有する金属板である。上記
のように補助ロールＲ１、Ｒ３を用いることにより、被
加熱材Ｗはロール電極Ｒ２およびＲ４の所定範囲の周面
と接触し、面接触となるので、スパークを発生させない
許容電流値が大きい。ロール電極Ｒ２およびＲ４の間に
は慴動子Ｓ１、Ｓ２を介して導電部材１４が接続されて
いる。FIG. 2 is a view showing an embodiment of the mechanism of the electric heating apparatus of the present invention. An auxiliary roll R1 lined with a rubber material or the like and an electrically conductive roll electrode R2 are arranged on the inlet side of the feed path L for the heated material W so as to face each other with the heated material W interposed therebetween. Similarly, an auxiliary roll R3 and a roll electrode R4 are provided on the exit side so as to face each other. The material to be heated W is
For example, it is a metal plate having conductivity such as a steel plate. By using the auxiliary rolls R1 and R3 as described above, the material W to be heated comes into contact with the peripheral surfaces of the roll electrodes R2 and R4 in a predetermined range to form surface contact, so that the allowable current value that does not generate spark is large. The conductive member 14 is connected between the roll electrodes R2 and R4 via the sliders S1 and S2.
【００１１】送り通路の入り側にはチョークＣＨを設
け、加熱ゾーンから入り側に電圧が漏れないようにして
いる。さらに、チョークＣＨの直前には接地ロールＲ０
１、Ｒ０２が設けられ、入り側を接地して安全を保って
いる。A choke CH is provided on the inlet side of the feed passage to prevent voltage leakage from the heating zone to the inlet side. Furthermore, immediately before the choke CH, the ground roll R0
1, R02 are provided, and the entrance side is grounded to keep safety.
【００１２】ロール電極Ｒ２、Ｒ４および補助ロールＲ
１、Ｒ３は、被加熱材Ｗの巾以上の軸方向長さを有し、
それぞれの周面が送り通路Ｌを挟んで被加熱材Ｗがそれ
ぞれの周面と接触しつつ通過可能な所定間隙を隔てて相
対向させて配置されている。Roll electrodes R2, R4 and auxiliary roll R
1, R3 have an axial length that is equal to or greater than the width of the material W to be heated
The respective peripheral surfaces are arranged to face each other with a predetermined gap through which the heated material W can pass while being in contact with the respective peripheral surfaces across the feed passage L.
【００１３】導電部材１４は、所定の巾、厚みを有する
銅材等の良導電材により形成されている。導電部材１４
は、環状トランスに近接して環状トランスの両側に配置
されている。慴動子Ｓ１、Ｓ２は導電部材１４の両端に
それぞれ接続されるとともに、ロール電極Ｒ２およびロ
ール電極Ｒ４それぞれを構成するロールの回転軸に設け
た受電部と慴動接触可能にされている。The conductive member 14 is formed of a good conductive material such as a copper material having a predetermined width and thickness. Conductive member 14
Are arranged on both sides of the annular transformer in proximity to the annular transformer. The sliders S1 and S2 are connected to both ends of the conductive member 14, respectively, and can be slidably contacted with a power receiving portion provided on a rotation shaft of a roll forming each of the roll electrode R2 and the roll electrode R4.
【００１４】なお、図示しないが、金属ロール、セラミ
ックコーティングロール、セラミックロール等のサポー
トロールを被加熱材Ｗの送り通路に設けてもよい。Although not shown, a support roll such as a metal roll, a ceramic coating roll, or a ceramic roll may be provided in the feed passage of the material W to be heated.
【００１５】この装置においては、被加熱材Ｗへの通電
手段として環状トランス２０が設けられている。環状ト
ランス２０は、たとえば磁路として好適な性質を有する
珪素鋼板を図４に示すようにロ字状部材２２として形成
して積層し、所定の長さとした鉄心と、環の内外周にか
けて巻き回した一次コイル２４とから構成され、環内が
被加熱材Ｗの送り通路Ｌを形成している。すなわち、環
内断面空間の大きさは移動中の被加熱材Ｗが巾方向に移
動、すなわち横揺れする距離、上下方向のうねり、たと
えば薄鋼板の場合に生じる板の波やバタツキ等およびカ
テナリによる被加熱材Ｗのたわみ等を考慮して、非接触
状態で通過可能に設定される。In this apparatus, an annular transformer 20 is provided as a means for energizing the material W to be heated. The annular transformer 20 is formed, for example, by forming a silicon steel plate having a property suitable as a magnetic path as a square-shaped member 22 as shown in FIG. 4 and stacking the laminated members. The primary coil 24 and the primary coil 24 form a feed passage L for the material W to be heated. That is, the size of the cross-sectional space in the annulus depends on the distance in which the heated material W moves in the width direction, that is, the lateral wobbling, the undulation in the vertical direction, for example, the wave and flap of the plate generated in the case of a thin steel plate, and catenary. In consideration of the bending of the material to be heated W and the like, the material W is allowed to pass in a non-contact state.
【００１６】なお、環状トランス２０は図５に示すよう
な構成のものでもよい。即ち、鉄心２２の環内空間をや
や大としたうえ、当該環内に被加熱材Ｗの送り通路Ｌを
囲む如く、かつ鉄心２２と同心の環状を呈する防護隔壁
２６を設ける。当該防護隔壁２６は１層ないし図示の如
く２層である。１層とした場合の防護隔壁２６は非磁性
体、例えばステンレススチール等の金属材が用いられ、
被加熱材Ｗがトランス２０内通過に際する揺れ、あるい
は破断等の事故時の撥ねで一次コイル２４に接触して破
損するのを防止する。２層とした場合の防護隔壁２６は
上記非磁性体の金属材を内側層２６ａに、断熱材、例え
ば断熱ファイバー等を外側層２６ｂにしてあり、トラン
ス破損防止とともに、被加熱材Ｗからの放射熱による一
次コイル２４の焼損を防止する。また、被加熱材Ｗが一
次コイル２４を破損する恐れのない場合には、断熱材の
みで１層を形成して一次コイル２４の焼損防止をするよ
うにしてもよい。なお、一次コイル２４を管材とし、管
内に当該一次コイル２４冷却用の冷却水を通水する構成
としてもよい。The annular transformer 20 may have the structure shown in FIG. That is, the inner space of the iron core 22 is made slightly larger, and a protective partition wall 26 is provided inside the annulus so as to surround the feed passage L for the material W to be heated and which has an annular shape concentric with the iron core 22. The protective partition 26 has one layer or two layers as shown. The protective partition 26 in the case of one layer is made of a non-magnetic material, for example, a metal material such as stainless steel,
This prevents the material W to be heated from coming into contact with the primary coil 24 and being damaged by swaying when passing through the transformer 20 or splashing in an accident such as breakage. In the case of the two-layer protective barrier 26, the non-magnetic metal material is used as the inner layer 26a and the heat insulating material such as heat insulating fiber is used as the outer layer 26b. The primary coil 24 is prevented from burning due to heat. Further, when there is no risk of the heated material W damaging the primary coil 24, one layer may be formed of only a heat insulating material to prevent the primary coil 24 from burning. Note that the primary coil 24 may be a pipe material, and cooling water for cooling the primary coil 24 may pass through the pipe.
【００１７】図１は図２の装置の環状トランス２０に電
圧を供給する回路を示す図である。３相交流電源４０か
ら供給された３相交流は周波数相数変換器４２において
単相交流に変換されるとともに、所定の周波数に変換さ
れる。周波数相数変換器４２で得られた所定の周波数ｆ
の単相交流は環状トランス２０の一次巻線２４に送られ
る。なお、タップ切換器を設けて環状トランス２０の一
次巻線２４の巻数を変えるようにしてもよい。FIG. 1 is a diagram showing a circuit for supplying a voltage to the annular transformer 20 of the apparatus shown in FIG. The three-phase alternating current supplied from the three-phase alternating current power supply 40 is converted into a single-phase alternating current by the frequency-phase number converter 42 and also converted into a predetermined frequency. Predetermined frequency f obtained by the frequency phase converter 42
Of the single-phase alternating current is sent to the primary winding 24 of the annular transformer 20. A tap changer may be provided to change the number of turns of the primary winding 24 of the annular transformer 20.
【００１８】周波数変換制御部４４は周波数ｆを設定
し、周波数の設定信号を周波数相数変換器４２へ出力す
る。周波数ｆの設定は、被加熱材Ｗの材質に応じて定め
られる第１の定数Ｋ1 、第２の定数Ｋ2 および被加熱材
Ｗの板厚ｗに対して、式ｆ≦Ｋ1 ＋Ｋ2 ／ｗを満たすよ
うに行われる。The frequency conversion control unit 44 sets the frequency f and outputs a frequency setting signal to the frequency phase number converter 42. The setting of the frequency f satisfies the expression f≤K1 + K2 / w for the first constant K1, the second constant K2 and the plate thickness w of the heated material W, which are determined according to the material of the heated material W. Is done like.
【００１９】ここで、第１の定数Ｋ1 および第２の定数
Ｋ2 は、材質に応じてたとえば次のように定められる。
鉄および鉄合金（強磁性体） Ｋ1 ＝１５、Ｋ2 ＝６０
アルミニウムおよびアルミニウム合金 Ｋ1 ＝１０、Ｋ
2 ＝２
ニッケル合金（常磁性体、ステンレス材） Ｋ1 ＝３
０、Ｋ2 ＝３０
銅および銅合金（強磁性体） Ｋ1 ＝１０、Ｋ2 ＝２Here, the first constant K1 and the second constant K2 are determined as follows according to the material. Iron and iron alloys (ferromagnetic materials) K1 = 15, K2 = 60 Aluminum and aluminum alloys K1 = 10, K
2 = 2 Nickel alloy (paramagnetic material, stainless steel material) K1 = 3
0, K2 = 30 Copper and copper alloys (ferromagnetic materials) K1 = 10, K2 = 2
【００２０】これらの定数Ｋ1 およびＫ2 は被加熱材の
導電率σや透磁率μに応じて定められている。したがっ
て、たとえば導電率σが小さく透磁率μの大きい被加熱
材の場合にはＫ1 が小さく設定され、周波数が低く設定
される。これにより材質に基づく加熱の不均一を防ぐこ
とができ、断面の均一加熱を行うことができる。また、
上記式中のＫ2 ／ｗの項により、板厚に応じて周波数が
変化され、板厚が大きくなると周波数が低く設定され、
同様に断面の均一加熱を行うことができる。These constants K1 and K2 are determined according to the electric conductivity σ and magnetic permeability μ of the material to be heated. Therefore, for example, in the case of a heated material having a small electric conductivity σ and a large magnetic permeability μ, K1 is set small and the frequency is set low. This makes it possible to prevent uneven heating due to the material and to uniformly heat the cross section. Also,
With the term of K2 / w in the above equation, the frequency is changed according to the plate thickness, and the frequency is set low as the plate thickness increases,
Similarly, uniform heating of the cross section can be performed.
【００２１】上記の材料のうち、たとえばニッケル合金
の場合にはインピーダンスのうち、抵抗分が大きいた
め、周波数を高くしても断面における温度偏差が発生し
にくいため、定数Ｋ1 およびＫ2 を大きな値に設定して
いる。逆に、アルミニウムおよびアルミニウム合金また
は銅および銅合金の場合には、インピーダンスのうち、
インダクタンス分が大きいため、周波数を高くすると温
度偏差が発生する。このためこれらの材料については定
数Ｋ1 およびＫ2 を小さな値に設定している。Among the above materials, for example, in the case of a nickel alloy, the resistance component of the impedance is large, and therefore the temperature deviation in the cross section does not easily occur even if the frequency is increased, so that the constants K1 and K2 are set to large values. It is set. Conversely, in the case of aluminum and aluminum alloys or copper and copper alloys,
Since the inductance is large, temperature deviation occurs when the frequency is increased. Therefore, the constants K1 and K2 are set to small values for these materials.
【００２２】このように、被加熱材の透磁率、導電率、
板厚等に応じて環状トランス２０に供給する周波数を設
定するから、被加熱材の断面における均一加熱を行うこ
とができる。Thus, the magnetic permeability, conductivity,
Since the frequency supplied to the annular transformer 20 is set according to the plate thickness and the like, it is possible to uniformly heat the cross section of the material to be heated.
【００２３】３相交流電源４０から供給された交流は、
周波数相数変換器４２によって上記のように所定の周波
数の単相交流に変換され、環状トランス２０の一次巻線
２４に供給される。環状トランス２０の一次巻線２４に
所定の電圧が印加されると、トランスの２次側に相当す
る被加熱材Ｗに２次電圧が誘起され、被加熱材Ｗが通電
加熱される。なお、３相交流電源４０は、パワーコント
ロールスイッチを有する電源としてもよい。The alternating current supplied from the three-phase alternating current power supply 40 is
As described above, it is converted into a single-phase alternating current having a predetermined frequency by the frequency / phase number converter 42, and is supplied to the primary winding 24 of the annular transformer 20. When a predetermined voltage is applied to the primary winding 24 of the annular transformer 20, a secondary voltage is induced in the heated material W corresponding to the secondary side of the transformer, and the heated material W is electrically heated. The three-phase AC power supply 40 may be a power supply having a power control switch.
【００２４】図２において、環状トランス２０へ給電さ
れると、被加熱材Ｗに２次電圧が誘起され、被加熱材Ｗ
に発生した２次電流は慴動子Ｓ１およびＳ２を介して接
続される導電部材１４を帰線として流れることになる。
この場合、導電部材１４の抵抗は、被加熱材Ｗの抵抗に
比べ著しく小さくなるように設定されるため、電流はほ
とんどが被加熱材Ｗの加熱のために消費され、導電部材
１４における損失は少ない。したがって、効率的に被加
熱材Ｗを通電加熱するとともに、被加熱材Ｗに発生した
電圧はほとんど被加熱材Ｗの内部で消費されてしまい、
通電ロールＲ２、Ｒ４および導電部材１４にかかる電圧
は非常に低く、加熱装置の周囲に配置された機器の損傷
を防止するとともに、作業者の安全を保つことができ
る。In FIG. 2, when power is supplied to the annular transformer 20, a secondary voltage is induced in the heated material W, and the heated material W
The secondary current thus generated flows through the conductive member 14 connected via the sliders S1 and S2 as a return line.
In this case, the resistance of the conductive member 14 is set to be significantly smaller than the resistance of the heated material W, so most of the current is consumed for heating the heated material W, and the loss in the conductive member 14 is reduced. Few. Therefore, the material W to be heated is efficiently energized and heated, and most of the voltage generated in the material W to be heated is consumed inside the material W to be heated,
The voltage applied to the energizing rolls R2, R4 and the conductive member 14 is very low, which can prevent damage to the equipment arranged around the heating device and keep the worker safe.
【００２５】また、この装置においては環状トランス２
０の上下両側に導電部材１４が配置されているから、導
電部材１４とトランス２０との磁気結合が良く、インダ
クタンスを小さくすることができる。したがって、力率
が良いため、加熱の効率が高い。Further, in this device, the ring transformer 2 is used.
Since the conductive members 14 are arranged on the upper and lower sides of 0, the magnetic coupling between the conductive member 14 and the transformer 20 is good, and the inductance can be reduced. Therefore, since the power factor is good, the heating efficiency is high.
【００２６】本装置によれば、被加熱材の材質や断面積
が変化しても被加熱材の巾方向の温度偏差を１０℃以内
とする均一加熱を行うことができる。本装置によって板
厚２ｍｍの鋼材を常温から７５０℃まで周波数４０Ｈz
、電流４５kAで加熱したところ、板巾方向の温度偏差
が最大８℃で、均一な加熱ができた。According to the present apparatus, even if the material or cross-sectional area of the material to be heated changes, it is possible to perform uniform heating so that the temperature deviation of the material to be heated in the width direction is within 10 ° C. With this device, a steel material with a plate thickness of 2 mm is operated at a frequency of 40 Hz from room temperature to 750 ° C
When heated at a current of 45 kA, the temperature deviation in the plate width direction was 8 ° C. at maximum, and uniform heating was possible.
【００２７】図３は本発明の通電加熱装置の機構の他の
実施例を示す図である。この装置においては、図２の装
置のロール電極Ｒ４に代えて金属浴３０が設けられてい
る。金属浴３０は、浴漕３１に溶融金属３２を満たして
構成され、導電部材１４の端部が溶融金属３２内に浸さ
れている。通電加熱されて送られる被加熱材Ｗは、方向
転換ロールＲ５によって方向を変えられ、溶融金属３２
内に浸され、方向転換ロールＲ６によって方向を転換さ
れて排出される。また、導電部材１４は、ロール電極Ｒ
１、Ｒ２の直後で上側部分１４ａ、下側部分１４ｂに分
かれ、方向転換ロールＲ５の直前で１つにまとめられ、
方向転換ロールＲ５の直後で再び上側部分１４ｃ、下側
部分１４ｄに分かれて、上側部分１４ｃ、下側部分１４
ｄがそれぞれ溶融金属３２内に浸される。FIG. 3 is a view showing another embodiment of the mechanism of the electric heating apparatus of the present invention. In this apparatus, a metal bath 30 is provided instead of the roll electrode R4 of the apparatus shown in FIG. The metal bath 30 is configured by filling a bath 31 with molten metal 32, and the end of the conductive member 14 is immersed in the molten metal 32. The material W to be heated which is heated by electric conduction is changed in direction by the direction change roll R5, and the molten metal 32
It is dipped in the inside, and the direction is changed by the direction changing roll R6, and then discharged. Further, the conductive member 14 is a roll electrode R.
1, immediately after R2, is divided into an upper part 14a and a lower part 14b, and is combined into one just before the direction change roll R5,
Immediately after the direction-changing roll R5, the upper part 14c and the lower part 14d are divided again into the upper part 14c and the lower part 14c.
Each d is immersed in the molten metal 32.
【００２８】したがって、金属浴３０は図２のロール電
極Ｒ４と同様の作用を有し、環状トランス２０によって
被加熱材Ｗに誘起される電圧はロール電極Ｒ２および金
属浴３０を介して導電部材１４を帰線として流れ、被加
熱材Ｗが加熱される。Therefore, the metal bath 30 has the same action as that of the roll electrode R4 of FIG. 2, and the voltage induced in the material W to be heated by the annular transformer 20 is passed through the roll electrode R2 and the metal bath 30 to the conductive member 14. And the heated material W is heated.
【００２９】上記実施例の説明中では触れなかったが、
被加熱材Ｗに対する温度制御が行われることは勿論であ
る。即ち、被加熱材Ｗのサイズ、送り速度、比熱、所定
昇温温度等から予め求める所要電力、所要電流、所要電
圧のいずれかを被加熱材Ｗに与えるようトランス２０へ
の入力を予め所定に設定して運転するプリセット方式が
採られる場合がある。また、図示してはいないが、装置
の出側で被加熱材Ｗの温度を測定し、当該測定値が予定
された温度との間に差異がある場合には、パワーコント
ロールスイッチを操作して、差異に相当する電力、電
流、電圧のいずれかを調整するフィードバック方式を採
るようにしてもよい。Although not mentioned in the description of the above embodiment,
It goes without saying that the temperature of the material W to be heated is controlled. That is, an input to the transformer 20 is predetermined so that any one of a required power, a required current, and a required voltage obtained in advance from the size of the material to be heated W, a feed rate, a specific heat, a predetermined temperature rising temperature, etc. is given. A preset method of setting and operating may be adopted. Although not shown, the temperature of the heated material W is measured on the outlet side of the apparatus, and if there is a difference between the measured temperature and the planned temperature, operate the power control switch. Alternatively, a feedback method of adjusting any of electric power, current, and voltage corresponding to the difference may be adopted.
【００３０】付言ではあるが、本発明装置は水平や垂直
配置のみならず、任意の角度で配置可能である。As an additional note, the device of the present invention can be arranged not only horizontally or vertically but also at any angle.
【００３１】[0031]
【発明の効果】本発明によれば、環状トランスに供給さ
れる交流の周波数ｆを、前記被加熱材の材質に応じて定
められる第１の定数Ｋ1 、第２の定数Ｋ2 および前記被
加熱材の板厚ｗに対して、ｆ≦Ｋ1 ＋Ｋ2 ／ｗを満たす
ように設定するから、被加熱材が透磁率の大きい材質の
場合、導電率の小さい材質の場合または板厚の厚い材料
の場合には周波数を低く設定して被加熱材の断面におけ
る加熱のばらつきをなくすことができ、被加熱材を断面
について均一に加熱することができる。According to the present invention, the frequency f of the alternating current supplied to the annular transformer is determined by the first constant K1, the second constant K2 and the material to be heated, which are determined according to the material of the material to be heated. Is set so as to satisfy f ≦ K1 + K2 / w for the plate thickness w of the above. Therefore, when the material to be heated has a large magnetic permeability, a material having a low electrical conductivity, or a material having a large plate thickness, The frequency can be set low to eliminate heating variations in the cross section of the material to be heated, and the material to be heated can be heated uniformly in the cross section.
【図１】本発明の通電加熱装置の回路を示す図である。FIG. 1 is a diagram showing a circuit of an electric heating apparatus of the present invention.
【図２】本発明の通電加熱装置の一実施例を示す概略構
成図である。FIG. 2 is a schematic configuration diagram showing an embodiment of an electric heating device of the present invention.
【図３】本発明の通電加熱装置の他の実施例を示す概略
構成図である。FIG. 3 is a schematic configuration diagram showing another embodiment of the electric heating apparatus of the present invention.
【図４】通電加熱装置に用いられる環状トランスを示す
断面図である。FIG. 4 is a cross-sectional view showing an annular transformer used in an electric heating device.
【図５】通電加熱装置に用いられる環状トランスを示す
断面図である。FIG. 5 is a cross-sectional view showing an annular transformer used in an electric heating device.
１４ 導電部材 ２０ 環状トランス ２２ ロ字状部材 ２４ 一次コイル ３０ 金属浴 ４０ ３相交流電源 ４２ 周波数相数変換器 ４４ 周波数変換制御部 Ｒ１、Ｒ３ 補助ロール Ｒ２、Ｒ４ ロール電極 Ｓ１、Ｓ２ 慴動子 Ｗ 被加熱材 Ｌ 送り通路 14 Conductive member 20 ring transformer 22 Square-shaped member 24 Primary coil 30 metal bath 40 3-phase AC power supply 42 Frequency Phase Number Converter 44 Frequency conversion control unit R1, R3 auxiliary roll R2, R4 roll electrode S1 and S2 W Heated material L feeding passage
───────────────────────────────────────────────────── フロントページの続き (72)発明者 藤井 茂登 姫路市広畑区富士町１番地 新日本製鐵株 式会社広畑製鐵所内 (72)発明者 生田 文昭 神奈川県厚木市岡田1701−３ ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Shigeto Fujii 1st Fujimachi, Hirohata-ku, Himeji City Nippon Steel Corporation Inside the Hirohata Works (72) Inventor Fumiaki Ikuta 1701-3 Okada, Atsugi City, Kanagawa Prefecture
Claims (9)
の送り通路の入り側に配置されたロール電極に接触させ
るとともに、前記被加熱材の出側に設けられた導電機構
に接触させ、前記ロール電極および前記導電機構の間に
環状トランスを配置し、前記環状トランスは、環内が前
記被加熱材の送り通路となるように形成され、前記環状
トランスにより前記被加熱材に誘起される電圧によって
前記被加熱材を加熱する通電加熱装置において、該装置
は、 前記環状トランスへ供給される交流の周波数ｆを設定す
る周波数設定手段を有し、 前記周波数設定手段は、前記周波数ｆを、前記被加熱材
の材質に応じて定められる第１の定数Ｋ1 、第２の定数
Ｋ2 および前記被加熱材の板厚ｗに対して、ｆ≦Ｋ1 ＋
Ｋ2 ／ｗを満たすように設定することを特徴とする通電
加熱装置。1. A continuously fed material to be heated is brought into contact with a roll electrode arranged on the inlet side of a feed passage of the material to be heated, and a conductive mechanism is provided on the outlet side of the material to be heated. A ring-shaped transformer is disposed between the roll electrode and the conductive mechanism, and the ring-shaped transformer is formed so that the inside of the ring serves as a feed passage for the material to be heated. In the electric heating device for heating the material to be heated by the induced voltage, the device has a frequency setting means for setting a frequency f of the alternating current supplied to the annular transformer, and the frequency setting means is for the frequency. f is a first constant K1, a second constant K2 and a plate thickness w of the material to be heated, which are determined according to the material of the material to be heated, and f≤K1 +
An electric heating device characterized by being set so as to satisfy K2 / w.
前記第１の定数Ｋ1＝１５、第２の定数Ｋ2 ＝６０とす
ることを特徴とする請求項１に記載の通電加熱装置。2. The material to be heated is iron and an iron alloy,
2. The electric heating device according to claim 1, wherein the first constant K1 = 15 and the second constant K2 = 60.
ミニウム合金であり、前記第１の定数Ｋ1 ＝１０、第２
の定数Ｋ2 ＝２とすることを特徴とする請求項１に記載
の通電加熱装置。3. The material to be heated is aluminum or aluminum alloy, the first constant K1 = 10, the second constant
2. The electric heating apparatus according to claim 1, wherein the constant K2 of the above is set to 2.
記第１の定数Ｋ1 ＝３０、第２の定数Ｋ2 ＝３０とする
ことを特徴とする請求項１に記載の通電加熱装置。4. The electric heating apparatus according to claim 1, wherein the material to be heated is a nickel alloy, and the first constant K1 = 30 and the second constant K2 = 30.
前記第１の定数Ｋ1＝１０、第２の定数Ｋ2 ＝２とする
ことを特徴とする請求項１に記載の通電加熱装置。5. The material to be heated is copper and a copper alloy,
The electric heating device according to claim 1, wherein the first constant K1 = 10 and the second constant K2 = 2.
スへの交流の供給が停止された時に、前記周波数ｆを変
更することを特徴とする請求項１、２、３、４または５
に記載の通電加熱装置。6. The frequency setting means changes the frequency f when the supply of alternating current to the annular transformer is stopped.
The electric heating device according to.
材の送り通路の入り側に配置された前記ロール電極と、
前記被加熱材の出側に設けられた導電機構との間を接続
する導電部材を有し、 前記導電部材は、前記環状トランスの外周に近接して配
置されることを特徴とする請求項１、２、３、４、５ま
たは６に記載の通電加熱装置。7. The electric heating device further includes the roll electrode disposed on an inlet side of a feed passage for the material to be heated,
A conductive member is provided to connect a conductive mechanism provided on the outlet side of the material to be heated, and the conductive member is arranged close to the outer periphery of the annular transformer. The electric heating device according to 2, 3, 4, 5 or 6.
路の出側に配置されたロール電極であることを特徴とす
る請求項１、２、３、４、５、６または７に記載の通電
加熱装置。8. The electroconductive mechanism is a roll electrode arranged on the outlet side of a feed passage of the material to be heated, according to claim 1, 2, 3, 4, 5, 6 or 7. Electric heating device.
路の出側に配置された金属浴であり、前記被加熱材は前
記金属浴を通して送給され、前記導電部材は端部を前記
金属浴に浸されていることを特徴とする請求項１、２、
３、４、５、６または７に記載の通電加熱装置。9. The conductive mechanism is a metal bath arranged on an outlet side of a feed passage of the heated material, the heated material is fed through the metal bath, and the conductive member has an end portion. 3. It is dipped in a metal bath,
The electric heating device according to 3, 4, 5, 6 or 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3212690A JP2618300B2 (en) | 1991-07-30 | 1991-07-30 | Electric heating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3212690A JP2618300B2 (en) | 1991-07-30 | 1991-07-30 | Electric heating device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0533039A true JPH0533039A (en) | 1993-02-09 |
| JP2618300B2 JP2618300B2 (en) | 1997-06-11 |
Family
ID=16626816
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3212690A Expired - Lifetime JP2618300B2 (en) | 1991-07-30 | 1991-07-30 | Electric heating device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2618300B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011035014A (en) * | 2009-07-29 | 2011-02-17 | Neturen Co Ltd | Power source transformer of steel material heating device, and steel material heating device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5335886A (en) * | 1976-09-14 | 1978-04-03 | Girling Ltd | Antiskid brake control apparatus |
| JPS63128125A (en) * | 1986-11-18 | 1988-05-31 | High Frequency Heattreat Co Ltd | Wire rod energizing and heating device |
| JPS6460534A (en) * | 1987-08-28 | 1989-03-07 | Canon Kk | Detecting device for presence of detected sheet |
| JPH0361337A (en) * | 1989-07-27 | 1991-03-18 | Nippon Steel Corp | Ring transformer for electrical heating of strip |
-
1991
- 1991-07-30 JP JP3212690A patent/JP2618300B2/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5335886A (en) * | 1976-09-14 | 1978-04-03 | Girling Ltd | Antiskid brake control apparatus |
| JPS63128125A (en) * | 1986-11-18 | 1988-05-31 | High Frequency Heattreat Co Ltd | Wire rod energizing and heating device |
| JPS6460534A (en) * | 1987-08-28 | 1989-03-07 | Canon Kk | Detecting device for presence of detected sheet |
| JPH0361337A (en) * | 1989-07-27 | 1991-03-18 | Nippon Steel Corp | Ring transformer for electrical heating of strip |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011035014A (en) * | 2009-07-29 | 2011-02-17 | Neturen Co Ltd | Power source transformer of steel material heating device, and steel material heating device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2618300B2 (en) | 1997-06-11 |
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