JP2003130547A - Ac electric furnace - Google Patents
Ac electric furnaceInfo
- Publication number
- JP2003130547A JP2003130547A JP2001330352A JP2001330352A JP2003130547A JP 2003130547 A JP2003130547 A JP 2003130547A JP 2001330352 A JP2001330352 A JP 2001330352A JP 2001330352 A JP2001330352 A JP 2001330352A JP 2003130547 A JP2003130547 A JP 2003130547A
- Authority
- JP
- Japan
- Prior art keywords
- molten metal
- electric furnace
- rotation state
- reverse rotation
- tank
- 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
Landscapes
- Discharge Heating (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
- Furnace Details (AREA)
- General Induction Heating (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は溶融金属を生成する
交流式電気炉に関し、特にその製品の生産性を改善する
溶融金属の攪拌に使用して有効な電気炉に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an AC electric furnace for producing molten metal, and more particularly to an electric furnace effective for stirring molten metal which improves the productivity of the product.
【０００２】[0002]
【従来技術】従来、交流式電気炉槽は円形状の底面を有
する円筒槽の中心線に沿って、その周辺に、底面に対向
した水平面上の仮想正三角形△の頂点に位置する垂直な
３本の電極円柱を平行して設け、これら３本の交流用電
極円柱により△形電極を形成したものである。交流式電
気炉では、槽内に溶融すべき金属材料を入れ、上記３本
の交流用電極円柱により△形に形成された３本の電極に
多相交流電圧を印加する。各電極円柱間には３相交流電
圧が印加され、この３相交流電圧に応じた交流電流が流
れる。金属材料は交流電流が流れるときの抵抗性発熱に
よって溶融する。このような交流式電気炉においては、
電気抵抗の低い部分を通って電流が槽内を流れるので、
電気炉槽内で底の円周部分では電流の流れが悪い。交流
式電気炉では３本の電極円柱により、△形電極が形成さ
れているので、直流式電気炉よりも電流は槽内の広い範
囲の領域に流れる。しかし、電気炉槽の底の円周部分で
は電流の流れがよくないため、槽内との間に溶融金属に
は温度差が存在する。2. Description of the Related Art Conventionally, an AC type electric furnace tank has three vertical 3 points along the center line of a cylindrical tank having a circular bottom surface and at the periphery thereof, at the apex of a virtual equilateral triangle Δ on a horizontal plane facing the bottom surface. Two electrode cylinders are provided in parallel, and a Δ-shaped electrode is formed by these three AC electrode cylinders. In an AC electric furnace, a metal material to be melted is put in a tank, and a multiphase AC voltage is applied to the three electrodes formed in a triangle shape by the above three AC electrode columns. A three-phase AC voltage is applied between the electrode columns, and an AC current corresponding to the three-phase AC voltage flows. The metallic material melts due to resistive heat generation when an alternating current flows. In such an AC electric furnace,
Since the electric current flows in the tank through the part with low electrical resistance,
In the electric furnace tank, the current flow is poor at the bottom circumference. In the AC electric furnace, since the Δ-shaped electrode is formed by the three electrode cylinders, the electric current flows in a wider area in the tank than in the DC electric furnace. However, since the electric current does not flow well in the circumferential portion at the bottom of the electric furnace tank, there is a temperature difference between the molten metal and the inside of the tank.
【０００３】一方、電気炉槽の底部で円周部分における
溶融金属の流れを改善するため、電気炉槽の底面に外側
から電磁攪拌装置を装着してある。この電磁攪拌装置は
リニアモーターを構成する直線状、或は誘導モーターを
形成する円形状としたものが公知である。しかし、一定
方向に一様な磁界の流れを形成しているため、溶融金属
流は十分ではない。このため、なお、槽内との間で溶融
金属の温度差が存在する。On the other hand, in order to improve the flow of molten metal in the circumferential portion at the bottom of the electric furnace tank, an electromagnetic stirrer is mounted from the outside on the bottom surface of the electric furnace tank. It is known that this electromagnetic stirrer has a linear shape forming a linear motor or a circular shape forming an induction motor. However, since a uniform magnetic field flow is formed in a certain direction, the molten metal flow is not sufficient. Therefore, there is still a difference in temperature of the molten metal between the inside of the tank and the inside.
【０００４】[0004]
【発明が解決しようとする課題】上述の交流式電気炉で
はこのような槽底の円周部分で、槽内との間で溶融金属
の温度差が生ずるため、槽内での溶融金属温度の一様性
が劣り、生産性が低下する。本発明は、溶融金属を十分
に攪拌して上記課題を解決し、高い生産性を発揮するこ
とができる交流式電気炉を提供することを目的とする。In the above AC electric furnace, since the temperature difference of the molten metal between the inside of the tank and the inside of the tank occurs at the circumferential portion of the tank bottom, the temperature of the molten metal in the tank is Poor uniformity and reduced productivity. It is an object of the present invention to provide an AC electric furnace capable of solving the above problems by sufficiently stirring molten metal and exhibiting high productivity.
【０００５】[0005]
【課題を解決するための手段】本発明による交流式電気
炉は、内部に溶融金属を生成するための多相交流電極を
有する交流式電気炉槽と、交流式電気炉槽の下部に外側
から近接して直線状または円形状に配置された溶融金属
撹伴装置とを設けて構成した交流式電気炉において、溶
融金属攪拌装置を交互に正転状態と逆転状態に駆動する
電源供給手段を備えたことを特徴とするものである。An AC electric furnace according to the present invention includes an AC electric furnace tank having a multi-phase AC electrode for producing molten metal therein, and a lower part of the AC electric furnace tank from the outside. An alternating current electric furnace configured with a molten metal stirring device arranged in a straight line or a circular shape in proximity to each other is provided with a power supply means for alternately driving the molten metal stirring device between a normal rotation state and a reverse rotation state. It is characterized by that.
【０００６】また、本発明は、上記交流式電気炉におい
て、正転状態と逆転状態の保持時間比、及び上記各状態
間の切換え周期を決定し、上記電源供給手段に周期的な
切換えを行わせるタイミング決定手段を備えたものであ
る。Further, according to the present invention, in the AC electric furnace, the holding time ratio between the normal rotation state and the reverse rotation state and the switching cycle between the respective states are determined, and the power supply means is periodically switched. It is provided with a timing determining means.
【０００７】[0007]
【発明の実施の形態】以下、図面を参照して本発明につ
いて詳細に説明する。図１は、正転状態で動作している
直線状（または円形状）に配置された溶融金属攪拌装置
を交流式電気炉槽と共に示した本発明の一実施例の構成
図である。同図において、１は交流式電気炉槽、２は△
形に配置された３本の３相交流電極、３は溶融金属材
料、４は直線状（または円形状）に配置された溶融金属
攪拌装置である。溶融金属攪拌装置４は直線状（または
円形状）に配列された多相電極から成立っている。DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail below with reference to the drawings. FIG. 1 is a block diagram of an embodiment of the present invention showing a molten metal agitator arranged in a straight line (or circular shape) operating in a normal rotation state together with an AC electric furnace tank. In the figure, 1 is an AC electric furnace tank, 2 is a triangle
3 three-phase alternating current electrodes arranged in a shape, 3 is a molten metal material, and 4 is a molten metal stirring device arranged linearly (or circularly). The molten metal agitator 4 is composed of multi-phase electrodes arranged in a linear shape (or a circular shape).
【０００８】交流式電気炉槽１の外部下側に、直線状
（または円形状）の多相電極アレイより成立つ溶融金属
攪拌装置４が設けられている。交流式電気炉槽１の外部
直下に取付けられた溶融金属撹伴装置４に３相交流電圧
を印加すると、発生する磁界は交流電圧の位相に応じて
定められた方向に進行する。そこで、溶融している金属
材料はこの磁界の進行に同期して引張られ、磁界の進行
方向に進む。これによって、溶融金属には攪拌力が与え
らる。このような磁界の進行方向の溶融金属の流れによ
り溶融金属に与えられる攪拌力によって、槽内の底に滞
留している溶融金属は流れるが、十分な攪拌力が与えら
れると云うわけではない。図２は図１の溶融金属攪拌装
置４の構造を、Ａ−Ａ′で切断した多相電極を示す展開
図である。図２において、７は正転状態と逆転状態とを
切換える切換え手段、８はインバーターである。これら
の要素は、図３の電源供給手段１０に含まれる。正転状
態では、３相電極には３相交流電圧がＵＶＷの順に印加
されている。従って、溶融金属は正転状態で右向き方向
に駆動される。次に３相交流電圧が逆転状態に印加され
ると、溶融金属は左向き方向に駆動される。逆転状態で
は、図１においてＶ相とＷ相とを逆に接続して、交流電
圧はＵＷＶの順に印加される。本発明では図３（ａ）に
示すように、３相交流電圧が正転状態と逆転状態とに交
互に溶融金属攪拌装置の各電極へ印加される。A molten metal agitating device 4 formed of a linear (or circular) multiphase electrode array is provided below the outside of the AC electric furnace 1. When a three-phase AC voltage is applied to the molten metal stirrer 4 mounted immediately below the outside of the AC electric furnace 1, the generated magnetic field proceeds in a direction determined according to the phase of the AC voltage. Therefore, the molten metal material is pulled in synchronization with the progress of the magnetic field and proceeds in the traveling direction of the magnetic field. This gives a stirring force to the molten metal. Due to the stirring force applied to the molten metal by the flow of the molten metal in the traveling direction of the magnetic field, the molten metal staying at the bottom of the tank flows, but it cannot be said that sufficient stirring force is applied. FIG. 2 is a development view showing a multiphase electrode obtained by cutting the structure of the molten metal agitator 4 of FIG. 1 at AA ′. In FIG. 2, 7 is a switching means for switching between a normal rotation state and a reverse rotation state, and 8 is an inverter. These elements are included in the power supply means 10 of FIG. In the normal rotation state, a three-phase AC voltage is applied to the three-phase electrodes in the order of UVW. Therefore, the molten metal is driven to the right in the forward rotation state. Next, when a three-phase AC voltage is applied in the reverse direction, the molten metal is driven leftward. In the reverse rotation state, the V phase and the W phase are connected in reverse in FIG. 1, and the AC voltage is applied in the order of UWV. In the present invention, as shown in FIG. 3A, a three-phase AC voltage is alternately applied to the electrodes of the molten metal agitator in the forward rotation state and the reverse rotation state.
【０００９】正転状態と逆転状態とはプログラム等で定
められた等しい時間の周期、或は予めプログラム等で定
められた正転／逆転時間比の周期で切換えられる。例え
ば、切換えの時定数は１０〜１００秒であり、正転と逆
転とで任意に設定できる。プログラム等はコンピュータ
等で使用され、プログラム等とコンピュータ等及び制御
機器等とにより、タイミング決定手段９を構成する。切
換えは、メカニカル式電力スイッチ或は半導体式電力切
換えスイッチなどの切換え手段７が内蔵された電源供給
手段１０によって行われる。図３（ｂ）は、上記制御を
行うタイミング決定手段９を電源供給手段１０と共に示
した系統図である。このように正転状態と逆転状態とを
繰返すことによって、溶融金属は交互に右方向と左方向
に駆動され、正転状態と逆転状態との切換え時には過渡
的に溶融金属に擾乱が発生して攪拌が進む。正転状態と
逆転状態との各保持時間及び周期は、それぞれの電気炉
に入れられている金属材料の状態によって、タイミング
決定手段９を使って選択的に決定することができる。The normal rotation state and the reverse rotation state are switched at an equal time period determined by a program or the like, or at a forward rotation / reverse rotation time ratio period previously determined by a program or the like. For example, the switching time constant is 10 to 100 seconds, and can be set arbitrarily for forward rotation and reverse rotation. The program and the like are used in a computer and the like, and the program and the like, the computer and the like, the control device and the like constitute the timing determining means 9. The switching is performed by a power supply means 10 having a built-in switching means 7 such as a mechanical power switch or a semiconductor power switch. FIG. 3B is a system diagram showing the timing determining means 9 for performing the above control together with the power supply means 10. By repeating the normal rotation state and the reverse rotation state in this way, the molten metal is alternately driven in the right direction and the left direction, and when the normal rotation state and the reverse rotation state are switched, a disturbance occurs in the molten metal transiently. Stirring proceeds. Each holding time and cycle of the normal rotation state and the reverse rotation state can be selectively determined by using the timing determining means 9 depending on the state of the metal material put in each electric furnace.
【００１０】[0010]
【発明の効果】本発明は交流式電気炉槽に入れられた溶
融金属に攪拌作用を与えるため、円形電気炉槽の底面に
近接して外部下側に直線状または円形状の溶融金属攪拌
装置を設け、溶融金属攪拌装置に印加する多相交流電圧
を正転状態と逆転状態とに周期的に切換えて駆動するこ
とにより、溶融金属に対して十分な攪拌力を付与するの
で、攪拌力不足によって発生する生産効率低下を未然に
防ぎ、生産性を向上できると云う効果がある。INDUSTRIAL APPLICABILITY According to the present invention, the molten metal contained in the AC electric furnace tank is stirred. Therefore, the molten metal stirrer in the shape of a straight line or a circle is formed near the bottom of the circular electric furnace tank and is located on the lower outside. Is provided and the multi-phase AC voltage applied to the molten metal agitator is periodically switched between the forward rotation state and the reverse rotation state to drive the molten metal, so that sufficient stirring force is applied to the molten metal. There is an effect that the production efficiency can be prevented from being lowered and the productivity can be improved.
【図１】正転状態で動作している直線状（または円形
状）の溶融金属攪拌装置を交流式電気炉と共に示した本
発明の一実施例を示す構成図である。FIG. 1 is a configuration diagram showing an embodiment of the present invention showing a linear (or circular) molten metal stirring device operating in a normal rotation state together with an AC electric furnace.
【図２】図１に示す溶融金属攪拌装置の構造をＡ−Ａ′
で切断して、平面に展開した模様を電源供給手段と共に
示す展開図である。FIG. 2 shows a structure of the molten metal stirring device shown in FIG.
It is a development view showing a pattern cut along with and developed on a plane together with a power supply means.
【図３】正転状態と逆転状態とを交互に実現する多相交
流電圧の切換えタイミング、並びにタイミング決定の系
統を示す説明図である。FIG. 3 is an explanatory diagram showing a switching timing of a multi-phase AC voltage that alternately realizes a normal rotation state and a reverse rotation state, and a timing determination system.
１……電気炉槽 ２……電極 ３……溶融金属 ４……溶融金属攪拌装置 ７……切換え手段 ８……インバーター ９……タイミング決定手段 １０……電源供給手段 1 ... Electric furnace tank 2 ... Electrode 3 ... Molten metal 4 ... Molten metal stirring device 7 ... Switching means 8 ... Inverter 9: Timing determination means 10 ... Power supply means
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 3K059 AB16 AC66 AD03 CD07 CD13 CD65 3K084 AA15 4K045 AA03 BA01 GB02 RB02 4K063 AA12 BA02 BA03 CA01 CA03 ─────────────────────────────────────────────────── ─── Continued front page F term (reference) 3K059 AB16 AC66 AD03 CD07 CD13 CD65 3K084 AA15 4K045 AA03 BA01 GB02 RB02 4K063 AA12 BA02 BA03 CA01 CA03
Claims (2)
流電極を有する交流式電気炉槽と、該交流式電気炉槽の
下部に外側から近接して直線状または円形状に配置され
た溶融金属攪拌装置とを設けて構成した交流式電気炉で
あって、前記溶融金属攪拌装置を交互に正転状態と逆転
状態に駆動する電源供給手段を備えたことを特徴とする
交流式電気炉。1. An AC electric furnace tank having a multi-phase AC electrode for producing molten metal therein, and a linear or circular shape arranged in the lower part of the AC electric furnace tank close to the outside from the outside. An alternating current electric furnace provided with a molten metal stirring device, comprising an electric power supply means for alternately driving the molten metal stirring device in a forward rotation state and a reverse rotation state. .
て、前記正転状態と前記逆転状態の保持時間比、及び前
記各状態間の切換え周期を決定し、前記電源供給手段に
周期的な切換えを行わせるタイミング決定手段を備えた
ことを特徴とする交流式電気炉。2. The AC electric furnace according to claim 1, wherein a holding time ratio between the normal rotation state and the reverse rotation state and a switching cycle between the respective states are determined, and the power supply means is cycled. AC electric furnace, characterized in that it is provided with a timing determining means for performing electrical switching.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001330352A JP2003130547A (en) | 2001-10-29 | 2001-10-29 | Ac electric furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001330352A JP2003130547A (en) | 2001-10-29 | 2001-10-29 | Ac electric furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003130547A true JP2003130547A (en) | 2003-05-08 |
Family
ID=19146083
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001330352A Pending JP2003130547A (en) | 2001-10-29 | 2001-10-29 | Ac electric furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003130547A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013539851A (en) * | 2010-09-14 | 2013-10-28 | エー ビー ビー リサーチ リミテッド | Apparatus and method for electromagnetic stirring in an electric arc furnace |
| JP2014519551A (en) * | 2011-07-18 | 2014-08-14 | エー ビー ビー リサーチ リミテッド | Method and control system for controlling a melting process |
| JP2014210972A (en) * | 2013-04-16 | 2014-11-13 | エービービーテクノロジーエルティーディー． | Method of controlling melt and refinery processes, and control system |
-
2001
- 2001-10-29 JP JP2001330352A patent/JP2003130547A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013539851A (en) * | 2010-09-14 | 2013-10-28 | エー ビー ビー リサーチ リミテッド | Apparatus and method for electromagnetic stirring in an electric arc furnace |
| JP2014519551A (en) * | 2011-07-18 | 2014-08-14 | エー ビー ビー リサーチ リミテッド | Method and control system for controlling a melting process |
| US8888888B2 (en) | 2011-07-18 | 2014-11-18 | Abb Research Ltd. | Method and a control system for controlling a melting process |
| US9572203B2 (en) | 2011-07-18 | 2017-02-14 | Abb Research Ltd. | Control system for a melting process |
| TWI609970B (en) * | 2011-07-18 | 2018-01-01 | 艾寶研究有限公司 | A control system for controlling a melting process in an electrical arc furanee (eaf) for melting a metallic material |
| JP2014210972A (en) * | 2013-04-16 | 2014-11-13 | エービービーテクノロジーエルティーディー． | Method of controlling melt and refinery processes, and control system |
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