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JP3608240B2 - Crucible induction melting furnace with L-shaped iron core - Google Patents
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JP3608240B2 - Crucible induction melting furnace with L-shaped iron core - Google Patents

Crucible induction melting furnace with L-shaped iron core Download PDF

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Publication number
JP3608240B2
JP3608240B2 JP02618295A JP2618295A JP3608240B2 JP 3608240 B2 JP3608240 B2 JP 3608240B2 JP 02618295 A JP02618295 A JP 02618295A JP 2618295 A JP2618295 A JP 2618295A JP 3608240 B2 JP3608240 B2 JP 3608240B2
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iron core
crucible
shaped
melting furnace
upper iron
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JPH08200962A (en
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省三 大島
直祐 相田
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神鋼電機株式会社
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Description

【0001】
【産業上の利用分野】
本発明は、磁路を構成するL形鉄心がその下部において上下方向に二分割されていて、電磁誘導作用によってるつぼ内に収容されている金属を溶解する構成のL形鉄心を備えたるつぼ形誘導溶解炉に関するものである。
【0002】
【従来の技術】
るつぼ形誘導溶解炉に使用される鉄心には、I形のものと、L形のものとがあるが、後者は前者に比較して磁気抵抗が小さいために、誘導溶解炉として熱効率が高い利点があり、本出願人は、特願平6-95841 号として、このL形鉄心を備えたるつぼ形誘導溶解炉の改良として、このL形鉄心の下部を上下方向に二分割したものに関する出願を行った。
【0003】
このL形鉄心を備えたるつぼ形誘導溶解炉の基本構成は、るつぼの外周に誘導コイルが巻回されて、該誘導コイルの外側に磁路を構成する多数本のL形鉄心が垂直に配設され、該L形鉄心は、多数枚の鉄心片の両側が親板で挟まれていると共に、該親板の背面部は背面側に延設され、しかも相対向する各親板の延設部の間に結合板が配設されて、該結合板の周縁部と、多数枚の鉄心の背面部と、各親板の延設部とが互いに溶着されて一体構造となっており、かつ該L形鉄心は、その下部において上下に二分割されて、その下部鉄心の下端部は、炉底のキャスター内に埋設されていると共に、その上部鉄心は、炉枠に対して非固定状態で支持され、上部鉄心と下部鉄心とは、それぞれに設けられた各結合板が連結具により連結されて分離可能に結合され、前記誘導コイルに通電して生ずる電磁誘導作用によって前記るつぼ内の金属を溶解するものである。
【0004】
L形鉄心の下部が上下方向に二分割されていると、誘導コイルの取出し時において、下部鉄心に対して上部鉄心が分離可能であるために、下部鉄心を炉底のキャスター内に埋設させたままで、このキャスターを解体することなく、誘導コイルの取出しを容易に行える利点がある。しかし、下部鉄心に対して上部鉄心を分離させるには、上部鉄心及び下部鉄心の各結合板を連結している連結具(多くの場合はボルト)を取外す必要があるが、上部鉄心及び下部鉄心は、いずれも、これを構成する親板が背面側に延設されているため、この親板の延設部が連結具の締結及びその解除を行うための工具(多くの場合はスパナ)と干渉して、この連結具の締結及びその解除に手間どるという問題があった。また、分離した上部鉄心を下部鉄心に結合させる場合において、両者の位置合わせに手間どるという問題もあった。
【0005】
【発明が解決しようとする課題】
本発明は、上下に二分割されたL形鉄心を備えたるつぼ形誘導溶解炉において、下部鉄心に対して上部鉄心を分離可能に結合している連結具の締結及びその解除の操作を行い易くするようにし、併せて下部鉄心に対する上部鉄心の位置決めを簡単に行えるようにすることを課題としている。
【0006】
【課題を解決するための手段】
上記課題を解決するための請求項1の発明は、自身の下部が上下方向に二分割されたL形鉄心を備えた前記るつぼ形誘導溶解炉において、前記下部鉄心に対する前記上部鉄心の結合及びその分離時に、前記連結具の締結及びその解除を行うための工具と、該上部鉄心を構成する各親板の延設部との干渉を避けるために、該上部鉄心を構成する各親板の延設部の下端部を欠落させたことである。
また、請求項2の発明は、請求項1の発明において、前記上部鉄心の下端部と前記下部鉄心の上端部とに、それぞれ互いに嵌合し合う形状の凹凸部を設けて、該凹凸部の嵌合により下部鉄心に対する上部鉄心の横方向の位置決めを行うように構成したことである。
【0007】
【発明の作用】
請求項1の発明によれば、上下方向に二分割されたL形鉄心のうち、上部鉄心を構成する各親板の延設部の下端部が欠落されているため、上部鉄心と下部鉄心との各結合板を連結している連結具の締結及びその解除を行うための工具と、上部鉄心を構成する各親板の延設部との干渉がなくなって、工具の回動範囲などが広くなるため、該連結具の締結及びその解除の操作が行い易くなる。
また、請求項2の発明によれば、請求項1の発明の上記作用効果に加えて、更に下部鉄心に対して上部鉄心を結合させる際に、それぞれに設けられた凹凸部を嵌合させると、下部鉄心に対する上部鉄心の横方向の位置決めが行われるので、両者の結合作業が容易となる。
【0008】
【実施例】
以下、実施例を挙げて、本発明を更に詳細に説明する。図1は、本発明に係るるつぼ形誘導溶解炉の全体側面図であり、図2は、同じく炉本体Aの縦断面図であり、図3は、図2のX−X線断面図であり、図4は、図2の主要部の拡大図であり、図5は、L形鉄心C1 の斜視図であり、図6は、上部鉄心13と下部鉄心14とを分離させたL形鉄心C1 の斜視図であり、図7は、上部鉄心13及び下部鉄心14の分解斜視図である。図1において、炉本体Aは、その上端部が架台1の上端部にヒンジピン2を介して枢着され、該炉本体Aの上端部と架台1の下端部とが一対の油圧シリンダ3(図1では、一対の油圧シリンダ3が重なって見える)により連結されている。よって、該一対の油圧シリンダ3によって前記ヒンジピン2の部分を中心にして炉本体Aを垂直面内で回動させると、その内部に設けられたるつぼ4内の溶湯が出湯されるように構成されている。
【0009】
次に、図2ないし図4を参照にして、炉本体Aの構成について説明する。炉本体Aは、その底部に環状フレーム5が設けられて、該環状フレーム5の外側に多数本の鋼柱6が周方向に沿ってほぼ等間隔をおいて垂直に配置されて、各鋼柱6の下端部は環状フレーム5に固着されていると共に、その上端部はテーブル板7に固着されている。環状フレーム5の内側の部分が炉底部を構成していて、この部分は、キャスター(耐火材)8で覆われている。炉本体Aの中心部に、前記環状フレーム5と同心となって耐火材から成るるつぼ4が設けられ、該るつぼ4の底部は前記キャスター8に接している。このようにして、環状フレーム5と、多数本の鋼柱6と、テーブル板7などが一体に固着されて、炉枠9が構成される。
【0010】
るつぼ4の外側には、コイルセメント11を介して誘導コイル12がそのほぼ全高にわたって巻回されている。該誘導コイル12の外側には多数本のL形鉄心C1 が円周方向に沿ってほぼ等間隔をおいて垂直に配設されている。図5ないし図7に示されるように、このL形鉄心C1 は、その下部において上下に二分割されていて、上部鉄心13と下部鉄心14とで構成される。また、上部鉄心13は、多数枚の鉄心片13aの両側を該鉄心片13aよりも幅の広い親板13bで挟んで、各親板13bの背面部を背面側に延設させ、この鉄心片13aの背面部と、各親板13bの延設部13b’とで形成される空間部に複数枚の結合板15を上下方向に沿って所定の間隔をおいて嵌め込んで、該結合板15の周縁部と、前記鉄心片13aの背面部と、前記延設部13b’とを溶着して一体化した構成である(図8参照)。更に、図9に示されるように、各親板13bの下端部は、鉄心片13aの下端面よりも下方に延設されて、嵌合凹部16が設けられている。そして、図5及び図6に示されるように、各親板13bの延設部13b’の下端部であって、下端に配設された前記結合板15よりも上方の部分は欠落されて、欠落部13b”となっている。
【0011】
一方、下部鉄心14は、図6及び図7に示されるように、多数枚の鉄心片14aの両側を該鉄心片14aよりも幅の広い親板14bで挟んで、上部鉄心13と同様にして、複数枚の結合板15を介して一体化した構成である。この下部鉄心14の上部には、前記上部鉄心13に設けられた嵌合凹部16に対応する嵌合凸部17が設けられている。そして、上部鉄心13に設けられた嵌合凹部16に下部鉄心14に設けられた嵌合凸部17が嵌合されて、上部鉄心13の下端に設けられた結合板15と、下部鉄心14の上端に設けられた結合板15とが二本のボルト18aとナット18bを介して連結され、これにより上部鉄心13と下部鉄心14とが分離可能に結合されている。なお、下部鉄心14に上部鉄心13が載置されているのみで、両者が結合されていない場合には、下部鉄心14に対して上部鉄心13は奥行方向(円形のるつぼ4の半径方向)に移動可能である。
【0012】
また、図2及び図4に示されるように、前記下部鉄心14の下端部は、前記炉枠9の下部に設けられたキャスター8内に埋設されている。このため、下部鉄心14は固定されていて、取り外すことはない。また、前記誘導コイル12の下端面は、該下部鉄心14の上面に接していると共に、該下部鉄心14の内側の傾斜面は前記るつぼ4に接している。
【0013】
また、L形鉄心C1 を構成する上部鉄心13は、前記鋼柱6に螺合された上下2本(一般には数本)の押付ボルト19によって背面側から誘導コイル12の外周面に押し付けられている。このため、上下2本(一般には数本)の押付ボルト19を緩めると、下部鉄心14は固定されたままで、上部鉄心13のみが僅かに後退して、誘導コイル12の外周面から離れるようになっている。なお、図2において、21,22は、それぞれコイル押え、出湯口を示す。
【0014】
そして、誘導コイル12の修理,交換などのために、これを炉枠9から取り出すには、図10に示されるように、炉枠9を構成する鋼柱6の側方から挿入されたスパナ20によってナット18bを回動させて、ボルト18aとの螺合を解いて、下部鉄心14に対して上部鉄心13を分離させる。ここで、上部鉄心13を構成する各親板13bの延設部13b’の下端部は欠落されて欠落部13b”となっているので、前記スパナ20と各親板13bの延設部13b’とが干渉しなくなって、ナット18bの回動をスムーズに行える。そして、図11に示されるように、るつぼ4の解体を行った後に、コイル押え21を上方に取り外し、その後に各鋼柱6に螺合されている押付ボルト19を緩めて、L形鉄心C1 を構成する上部鉄心13のみを後退させる(外側に移動させる)。これにより、上部鉄心13は誘導コイル12の外周面から離れる。次に、図12に示されるように、内部にコイルセメント11が取り付けられた状態で、誘導コイル12を上方に抜き去る。また、誘導コイル12の修理,交換などを終えて、下端部がキャスター8に埋設されている下部鉄心14に対して上部鉄心13を結合させるには、上記と同様にして、鋼柱6の側方から挿入されたスパナ20によってナット18bを回動させることにより、上部鉄心13と下部鉄心14との各結合板15をボルト18a及びナット18bにより連結する。
【0015】
上記実施例のL形鉄心C1 は、上部鉄心13の下端部に設けられた嵌合凹部16と、下部鉄心14の上端部に設けられた嵌合凸部17とが嵌合されているために、両者を結合させる際における横方向(円形のるつぼ4の接線方向)の位置決めが自動的に行われると共に、誘導コイル12の修理,交換などの際に、上部鉄心13を奥行方向(円形のるつぼ4の半径方向)に沿って移動させ易い利点がある。
【0016】
図13及び図14に、上記L形鉄心C1 と異なる構成のL形鉄心C2 を使用したるつぼ形誘導溶解炉が示されている。このL形鉄心C2 は、上部鉄心23の下端面と下部鉄心24の上端面とがいずれも平面状になっていて、上部鉄心23は、下部鉄心24の上端面に載置されているのみであり、両者を結合させた状態において、上部鉄心23の下端の結合板15と下部鉄心24の上端の結合板15とは、相密着している。このL形鉄心C2 においても、上部鉄心23を構成する親板23bの延設部23b’の下端部は欠落されて、欠落部23b”となっていて、スパナ20の回動操作が行い易いようになっている。なお、図13及び図14において、23aは、上部鉄心23の鉄心片を示し、24a及び24bは、それぞれ下部鉄心24の鉄心片及び親板を示す。
【0017】
【発明の効果】
請求項1に記載の発明は、自身の下部が上下方向に二分割されたL形鉄心を備えたるつぼ形誘導溶解炉において、上部鉄心を構成する各親板の延設部の下端部が欠落されているので、下部鉄心に対する上部鉄心の結合及びその分離時に、両者を連結しているボルトなどの連結具の締結及びその解除を行うためのスパナなどの工具と、該上部鉄心を構成する各親板の延設部との干渉を避けることができる。この結果、工具の回動範囲などが広くなって、上部鉄心と下部鉄心とを連結している連結具の締結及びその解除の操作が行い易くなる。
また、請求項2に記載の発明は、請求項1に記載の発明において、上部鉄心の下端部と下部鉄心の上端部とに、それぞれ互いに嵌合し合う形状の凹凸部が設けられて、該凹凸部の嵌合により下部鉄心に対する上部鉄心の横方向に沿った位置決めが行なわれるように構成されているので、請求項1の作用効果に加えて更に、下部鉄心に対して上部鉄心を結合させる際における横方向の位置決めが自動的に行われて、両者の結合作業が容易となる。
【図面の簡単な説明】
【図1】本発明に係るるつぼ形誘導溶解炉の全体側面図である。
【図2】炉本体Aの縦断面図である。
【図3】図2のX−X線断面図である。
【図4】図2の主要部の拡大図である。
【図5】L形鉄心C1 の斜視図である。
【図6】L形鉄心C1 を構成する上部鉄心13と下部鉄心14とを分離させた状態の斜視図である。
【図7】L形鉄心C1 を構成する上部鉄心13と下部鉄心14の分解斜視図である。
【図8】上部鉄心13の下端部を除く部分の拡大横断面図である。
【図9】図4のY−Y線断面図である。
【図10】上部鉄心13の下端部の横断面図である。
【図11】るつぼ4の解体後にL形鉄心C1 を構成する上部鉄心13を後方に移動させた状態の縦断面図である。
【図12】誘導コイル12を取り出している状態の縦断面図である。
【図13】別のL形鉄心C2 を備えた炉本体Aの部分断面図である。
【図14】図13のY’−Y’線断面図である。
【符号の説明】
A:炉本体
1,2 :L形鉄心
4:るつぼ
8:キャスター
9:炉枠
12:誘導コイル
13,23:上部鉄心
13a,23a:鉄心片
13b,23b:親板
13b',23b':親板の延設部
13b",23b":親板の延設部に設けられた欠落部
14,24:下部鉄心
15:結合板
16:嵌合凹部
17:嵌合凸部
18a:ボルト(連結具)
18b:ナット(連結具)
20:スパナ(工具)
[0001]
[Industrial application fields]
In the present invention, an L-shaped iron core constituting a magnetic path is divided into two in the vertical direction at the lower part thereof, and a crucible having an L-shaped iron core configured to melt a metal contained in a crucible by electromagnetic induction action. It relates to an induction melting furnace.
[0002]
[Prior art]
Iron cores used for crucible type induction melting furnaces are of type I and type L, but the latter has the advantage of high thermal efficiency as an induction melting furnace because of its lower magnetic resistance than the former. As an improvement of the crucible induction melting furnace equipped with this L-shaped core, the present applicant has filed an application regarding the lower part of this L-shaped core divided in the vertical direction as Japanese Patent Application No. 6-95841. went.
[0003]
The basic structure of the crucible induction melting furnace having this L-shaped iron core is that an induction coil is wound around the outer periphery of the crucible, and a large number of L-shaped iron cores constituting a magnetic path are arranged vertically on the outside of the induction coil. The L-shaped iron core has a large number of core pieces sandwiched between the parent plates, and the rear portion of the parent plate extends to the rear surface, and the opposite parent plates extend. A coupling plate is disposed between the parts, a peripheral portion of the coupling plate, a back surface portion of a plurality of iron cores, and an extended portion of each parent plate are welded together to form an integral structure; and The L-shaped iron core is vertically divided into two parts at the lower part thereof, and the lower end part of the lower iron core is embedded in a caster at the bottom of the furnace, and the upper iron core is not fixed to the furnace frame. Supported, the upper and lower iron cores can be separated from each other by connecting the connecting plates provided on each of them with a connector. The combined and dissolves the metal in the crucible by electromagnetic induction caused by supplying an electric current to the induction coil.
[0004]
If the lower part of the L-shaped iron core is divided vertically, the upper iron core can be separated from the lower iron core when the induction coil is taken out, so the lower iron core is buried in the caster at the bottom of the furnace. Thus, there is an advantage that the induction coil can be easily taken out without disassembling the caster. However, in order to separate the upper iron core from the lower iron core, it is necessary to remove the connecting tool (in many cases bolts) connecting the connecting plates of the upper iron core and the lower iron core. In both cases, since the main plate constituting this is extended on the back side, the extended portion of this main plate is a tool (in many cases, a wrench) for fastening and releasing the connector. There has been a problem that it takes time to fasten and release the connecting device due to interference. In addition, when the separated upper iron core is coupled to the lower iron core, there is a problem in that both positions are troublesome.
[0005]
[Problems to be solved by the invention]
The present invention is a crucible induction melting furnace having an L-shaped iron core that is divided into two parts in the upper and lower sides, and can easily perform the operation of fastening and releasing the coupler that detachably connects the upper iron core to the lower iron core. In addition, an object of the present invention is to easily position the upper core with respect to the lower iron core.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention of claim 1 is characterized in that , in the crucible induction melting furnace provided with an L-shaped iron core whose lower part is vertically divided into two, the upper iron core is coupled to the lower iron core and At the time of separation, in order to avoid interference between the tool for fastening and releasing the connector and the extending portion of each parent plate constituting the upper iron core, the extension of each parent plate constituting the upper iron core That is, the lower end portion of the installation portion is omitted.
According to a second aspect of the present invention, in the first aspect of the present invention, the lower and upper end portions of the upper iron core and the lower iron core are provided with concavo-convex portions that fit into each other. That is, the upper iron core is laterally positioned with respect to the lower iron core by fitting.
[0007]
[Effects of the Invention]
According to invention of Claim 1, since the lower end part of the extension part of each parent plate which comprises an upper iron core is missing among L-shaped iron cores divided into the up-and-down direction, an upper iron core, a lower iron core, There is no interference between the tool for fastening and releasing the connecting tool connecting the connecting plates and the extended part of each parent plate constituting the upper iron core, and the rotation range of the tool is wide. Therefore, it becomes easy to perform the operation of fastening and releasing the connector.
According to the invention of claim 2, in addition to the above-described effect of the invention of claim 1, when the upper iron core is further coupled to the lower iron core, the concave and convex portions provided in each are fitted. Since the upper iron core is positioned in the lateral direction with respect to the lower iron core, it is easy to combine them.
[0008]
【Example】
Hereinafter, the present invention will be described in more detail with reference to examples. 1 is an overall side view of the crucible induction melting furnace according to the present invention, FIG. 2 is a longitudinal sectional view of the furnace body A, and FIG. 3 is a sectional view taken along the line XX of FIG. 4 is an enlarged view of the main part of FIG. 2, FIG. 5 is a perspective view of the L-shaped iron core C 1 , and FIG. 6 is an L-shaped iron core in which the upper iron core 13 and the lower iron core 14 are separated. is a perspective view of a C 1, FIG. 7 is an exploded perspective view of the upper core 13 and the lower core 14. In FIG. 1, the upper end of the furnace body A is pivotally attached to the upper end of the gantry 1 via a hinge pin 2, and the upper end of the furnace body A and the lower end of the gantry 1 are paired with a pair of hydraulic cylinders 3 (see FIG. 1). 1, the pair of hydraulic cylinders 3 appear to overlap each other. Therefore, when the furnace body A is rotated in a vertical plane around the hinge pin 2 by the pair of hydraulic cylinders 3, the molten metal in the crucible 4 provided therein is discharged. ing.
[0009]
Next, the configuration of the furnace body A will be described with reference to FIGS. The furnace body A is provided with an annular frame 5 at the bottom, and a large number of steel columns 6 are arranged on the outer side of the annular frame 5 vertically at substantially equal intervals along the circumferential direction. The lower end portion of 6 is fixed to the annular frame 5, and the upper end portion thereof is fixed to the table plate 7. The inner part of the annular frame 5 constitutes the furnace bottom, and this part is covered with casters (refractory material) 8. At the center of the furnace body A, a crucible 4 made of a refractory material is provided concentrically with the annular frame 5, and the bottom of the crucible 4 is in contact with the caster 8. In this way, the annular frame 5, a large number of steel pillars 6, the table plate 7 and the like are integrally fixed to constitute a furnace frame 9.
[0010]
On the outside of the crucible 4, an induction coil 12 is wound over almost the entire height via a coil cement 11. Number on the outside the L-shaped iron core C 1 of the induction coil 12 is disposed vertically at a substantially equal intervals along the circumferential direction. As shown in FIGS. 5 to 7, the L-shaped iron core C 1 is vertically divided into two at the lower part thereof, and is composed of an upper iron core 13 and a lower iron core 14. Further, the upper iron core 13 is formed by sandwiching both sides of a large number of iron core pieces 13a with a main board 13b having a width wider than that of the iron core pieces 13a, and extending the back surface of each main board 13b to the back side. A plurality of coupling plates 15 are fitted into the space formed by the back surface portion of 13a and the extending portion 13b 'of each parent plate 13b at predetermined intervals along the vertical direction, and the coupling plate 15 The peripheral portion, the back surface portion of the iron core piece 13a, and the extending portion 13b ′ are integrated by welding (see FIG. 8). Furthermore, as FIG. 9 shows, the lower end part of each parent plate 13b is extended below rather than the lower end surface of the iron core piece 13a, and the fitting recessed part 16 is provided. And as shown in FIG. 5 and FIG. 6, the lower portion of the extending portion 13 b ′ of each parent plate 13 b, the portion above the coupling plate 15 disposed at the lower end is missing, It is a missing part 13b ".
[0011]
On the other hand, as shown in FIGS. 6 and 7, the lower iron core 14 is sandwiched between a plurality of iron core pieces 14a by a parent plate 14b wider than the iron core pieces 14a, and is made in the same manner as the upper iron core 13. The configuration is integrated through a plurality of coupling plates 15. A fitting convex portion 17 corresponding to the fitting concave portion 16 provided in the upper iron core 13 is provided on the upper portion of the lower iron core 14. And the fitting convex part 17 provided in the lower iron core 14 is fitted by the fitting recessed part 16 provided in the upper iron core 13, and the coupling plate 15 provided in the lower end of the upper iron core 13 and the lower iron core 14 of FIG. The connecting plate 15 provided at the upper end is connected via two bolts 18a and nuts 18b, whereby the upper iron core 13 and the lower iron core 14 are detachably connected. In addition, when only the upper iron core 13 is mounted on the lower iron core 14 and both are not coupled, the upper iron core 13 is in the depth direction (the radial direction of the circular crucible 4) with respect to the lower iron core 14. It is movable.
[0012]
As shown in FIGS. 2 and 4, the lower end portion of the lower iron core 14 is embedded in a caster 8 provided at the lower portion of the furnace frame 9. For this reason, the lower iron core 14 is fixed and is not removed. The lower end surface of the induction coil 12 is in contact with the upper surface of the lower iron core 14, and the inclined surface inside the lower iron core 14 is in contact with the crucible 4.
[0013]
The upper iron core 13 constituting the L-shaped iron core C 1 is pressed against the outer peripheral surface of the induction coil 12 from the back side by two upper and lower (generally several) pressing bolts 19 screwed into the steel column 6. ing. For this reason, when the two upper and lower (generally several) pressing bolts 19 are loosened, the lower iron core 14 remains fixed and only the upper iron core 13 is slightly retracted so as to separate from the outer peripheral surface of the induction coil 12. It has become. In FIG. 2, numerals 21 and 22 denote a coil presser and a hot water outlet, respectively.
[0014]
Then, in order to remove the induction coil 12 from the furnace frame 9 for repair, replacement, etc., as shown in FIG. 10, a spanner 20 inserted from the side of the steel column 6 constituting the furnace frame 9 is used. Thus, the nut 18b is rotated to unscrew the bolt 18a, and the upper iron core 13 is separated from the lower iron core 14. Here, since the lower end portion of the extended portion 13b ′ of each parent plate 13b constituting the upper iron core 13 is omitted to form a missing portion 13b ″, the extended portion 13b ′ of the spanner 20 and each parent plate 13b is formed. 11, the nut 18b can be rotated smoothly, and after the crucible 4 is disassembled as shown in Fig. 11, the coil presser 21 is removed upward, and then each steel column 6 is removed. Then, the pressing bolt 19 screwed onto the coil is loosened, and only the upper iron core 13 constituting the L-shaped iron core C 1 is retracted (moved outward), whereby the upper iron core 13 is separated from the outer peripheral surface of the induction coil 12. Next, as shown in Fig. 12, with the coil cement 11 attached inside, the induction coil 12 is pulled upward, and after the repair and replacement of the induction coil 12, the lower end portion is Caster 8 In order to couple the upper iron core 13 to the lower iron core 14 embedded in the upper iron core, the upper iron core is turned by rotating the nut 18b with the spanner 20 inserted from the side of the steel column 6 in the same manner as described above. 13 and the lower iron core 14 are connected by bolts 18a and nuts 18b.
[0015]
In the L-shaped iron core C 1 of the above embodiment, the fitting concave portion 16 provided at the lower end portion of the upper iron core 13 and the fitting convex portion 17 provided at the upper end portion of the lower iron core 14 are fitted. In addition, positioning in the lateral direction (tangential direction of the circular crucible 4) when the two are joined is automatically performed, and the upper iron core 13 is moved in the depth direction (circular shape) when the induction coil 12 is repaired or replaced. There is an advantage that it can be easily moved along the radial direction of the crucible 4.
[0016]
13 and 14 show a crucible induction melting furnace using an L-shaped iron core C 2 having a configuration different from that of the L-shaped iron core C 1 . In this L-shaped iron core C 2 , the lower end surface of the upper iron core 23 and the upper end surface of the lower iron core 24 are both flat, and the upper iron core 23 is only placed on the upper end surface of the lower iron core 24. In the state where both are coupled, the coupling plate 15 at the lower end of the upper iron core 23 and the coupling plate 15 at the upper end of the lower iron core 24 are in close contact with each other. Also in this L-shaped iron core C 2 , the lower end portion of the extending portion 23 b ′ of the parent plate 23 b constituting the upper iron core 23 is omitted to form a missing portion 23 b ″, and the spanner 20 can be easily rotated. 13 and 14, reference numeral 23a denotes an iron core piece of the upper iron core 23, and 24a and 24b denote iron core pieces and a parent plate of the lower iron core 24, respectively.
[0017]
【The invention's effect】
The invention described in claim 1 is a crucible induction melting furnace having an L-shaped iron core whose lower part is divided in the vertical direction. The lower end part of the extension part of each parent plate constituting the upper iron core is missing. Since the upper iron core is coupled to the lower iron core and separated from the lower iron core, a tool such as a spanner for fastening and releasing a connecting tool such as a bolt for connecting the two and the respective components constituting the upper iron core. Interference with the extended portion of the parent plate can be avoided. As a result, the rotation range of the tool is widened, and it becomes easy to perform fastening and releasing operations of the connecting tool that connects the upper iron core and the lower iron core.
The invention according to claim 2 is the invention according to claim 1, wherein the lower and upper end portions of the upper iron core and the lower iron core are provided with concave and convex portions that are fitted to each other, Since the positioning along the lateral direction of the upper core with respect to the lower iron core is performed by the fitting of the concavo-convex portion, in addition to the function and effect of the first aspect , the upper iron core is further coupled to the lower iron core. Positioning in the lateral direction at the time is automatically performed, and the coupling work between the two becomes easy.
[Brief description of the drawings]
FIG. 1 is an overall side view of a crucible induction melting furnace according to the present invention.
FIG. 2 is a longitudinal sectional view of a furnace body A.
3 is a cross-sectional view taken along line XX of FIG.
4 is an enlarged view of a main part of FIG.
FIG. 5 is a perspective view of an L-shaped iron core C 1 .
FIG. 6 is a perspective view showing a state in which an upper iron core 13 and a lower iron core 14 constituting an L-shaped iron core C 1 are separated.
7 is an exploded perspective view of the upper core 13 and the lower core 14 constituting the L-shaped iron core C 1.
8 is an enlarged cross-sectional view of a portion excluding the lower end portion of the upper iron core 13. FIG.
9 is a cross-sectional view taken along line YY in FIG.
10 is a cross-sectional view of the lower end portion of the upper iron core 13. FIG.
FIG. 11 is a longitudinal sectional view showing a state in which the upper iron core 13 constituting the L-shaped iron core C 1 is moved rearward after the crucible 4 is disassembled.
FIG. 12 is a longitudinal sectional view showing a state in which the induction coil 12 is taken out.
FIG. 13 is a partial cross-sectional view of a furnace main body A provided with another L-shaped iron core C 2 .
14 is a cross-sectional view taken along line Y′-Y ′ of FIG.
[Explanation of symbols]
A: furnace body C 1, C 2: L-shaped core 4: Crucible 8: casters 9: furnace frame 12: induction coil 13, 23: upper core
13a, 23a: Iron core pieces
13b, 23b: Master plate
13b ', 23b': Extension part of the main plate
13b ", 23b": Missing portions 14 and 24 provided in the extended portion of the parent plate 15: Lower iron core 15: Connecting plate 16: Fitting concave portion 17: Fitting convex portion 18a: Bolt (connecting tool)
18b: nut (connector)
20: Spanner (tool)

Claims (2)

るつぼの外周に誘導コイルが巻回されて、該誘導コイルの外側に磁路を構成する多数本のL形鉄心が垂直に配設され、該L形鉄心は、多数枚の鉄心片の両側が親板で挟まれていると共に、該親板の背面部は背面側に延設され、しかも相対向する各親板の延設部の間に結合板が配設されて、該結合板の周縁部と、多数枚の鉄心の背面部と、各親板の延設部とが互いに溶着されて一体構造となっており、かつ該L形鉄心は、その下部において上下に二分割されて、その下部鉄心の下端部は、炉底のキャスター内に埋設されていると共に、その上部鉄心は、炉枠に対して非固定状態で支持され、上部鉄心と下部鉄心とは、それぞれに設けられた各結合板が連結具により連結されて分離可能に結合され、前記誘導コイルに通電して生ずる電磁誘導作用によって前記るつぼ内の金属を溶解する構成のるつぼ形誘導溶解炉において、
前記下部鉄心に対する前記上部鉄心の結合及びその分離時に、前記連結具の締結及びその解除を行うための工具と、該上部鉄心を構成する各親板の延設部との干渉を避けるために、該上部鉄心を構成する各親板の延設部の下端部を欠落させたことを特徴とするL形鉄心を備えたるつぼ形誘導溶解炉。
An induction coil is wound around the outer periphery of the crucible, and a large number of L-shaped iron cores constituting a magnetic path are arranged vertically outside the induction coil. The L-shaped iron cores are arranged on both sides of a large number of iron core pieces. The back surface of the main plate is sandwiched between the main plates, and the back surface of the main plate is extended to the back side. Part, the back part of a large number of iron cores, and the extension part of each parent plate are welded together to form an integral structure, and the L-shaped iron core is divided into two parts vertically at the bottom, The lower end of the lower iron core is embedded in a caster at the bottom of the furnace, and the upper iron core is supported in a non-fixed state with respect to the furnace frame, and the upper iron core and the lower iron core are provided respectively. Electromagnetic induction effect produced by energizing the induction coil by coupling the coupling plates by a coupling tool so that they can be separated. Therefore, in a crucible-type induction melting furnace arrangement for dissolving the metal in the crucible,
In order to avoid interference between a tool for fastening and releasing the coupling tool and an extending portion of each parent plate constituting the upper iron core when the upper iron core is coupled to and separated from the lower iron core. A crucible induction melting furnace provided with an L-shaped iron core, characterized in that a lower end portion of an extension portion of each parent plate constituting the upper iron core is omitted.
前記上部鉄心の下端部と前記下部鉄心の上端部とに、それぞれ互いに嵌合し合う形状の凹凸部を設けて、該凹凸部の嵌合により下部鉄心に対する上部鉄心の横方向の位置決めが行なわれるように構成したことを特徴とする請求項1に記載のL形鉄心を備えたるつぼ形誘導溶解炉。The lower iron core and the upper iron core are provided with concave and convex portions that are fitted to each other, and the upper iron core is positioned laterally with respect to the lower iron core by fitting the concave and convex portions. The crucible induction melting furnace provided with the L-shaped iron core according to claim 1, characterized in that it is configured as described above.
JP02618295A 1995-01-20 1995-01-20 Crucible induction melting furnace with L-shaped iron core Expired - Lifetime JP3608240B2 (en)

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