JP2983918B2 - Molybdenum heating element connection structure - Google Patents
Molybdenum heating element connection structureInfo
- Publication number
- JP2983918B2 JP2983918B2 JP8330854A JP33085496A JP2983918B2 JP 2983918 B2 JP2983918 B2 JP 2983918B2 JP 8330854 A JP8330854 A JP 8330854A JP 33085496 A JP33085496 A JP 33085496A JP 2983918 B2 JP2983918 B2 JP 2983918B2
- Authority
- JP
- Japan
- Prior art keywords
- molybdenum
- heating element
- wire
- connection structure
- furnace
- 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.)
- Expired - Fee Related
Links
Landscapes
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Furnace Details (AREA)
- Resistance Heating (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、モリブデン発熱体
の接続構造に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molybdenum heating element connection structure.
【０００２】[0002]
【従来の技術】従来より、例えば、帯状金属板を連続的
に熱処理する連続加熱炉において、加熱装置としてモリ
ブデン発熱体を炉内壁面に波状に設置したものが知られ
ている。このモリブデン発熱体を所望の形状にして設置
するには、複数のモリブデン線を接続して必要な長さに
しなければならず、そのための接続方法として図８また
は図９に示すようにカップリング７０，７２を用いて溶
接やボルト７４によりモリブデン線の直線部で各端部２
４ａ，２４ｂを固定して、それらの平坦に加工した線端
面を面接触させていた。2. Description of the Related Art Conventionally, for example, in a continuous heating furnace for continuously heat-treating a strip-shaped metal plate, a heating device in which a molybdenum heating element is installed in a wavy shape on a furnace inner wall is known. In order to install the molybdenum heating element in a desired shape, a plurality of molybdenum wires must be connected to have a required length. As a connection method therefor, as shown in FIG. 8 or FIG. , 72 by welding or by bolts 74 at the straight portions of the molybdenum wire.
4a and 24b were fixed, and their flat processed line end faces were brought into surface contact.
【０００３】[0003]
【発明が解決しようとする課題】しかし、モリブデンの
融点は２６１０℃と高温であり、通常の溶接では母材
（モリブデン）の溶け込みが起こらないため、モリブデ
ン線の溶接には高度な技術が要求され非常に困難な作業
であった。また、溶接やボルトを用いたいずれの接続方
法においても、接触面となるモリブデン線の各端面は熱
間挙動（温度変化に基づく膨張、収縮）によってその接
触状態が大きく影響され、これらの原因により各端面の
接触状態が不安定になったり経年劣化による接触部のや
せ細りが起きると接続部における電気抵抗が増大する等
の問題があった。However, since the melting point of molybdenum is as high as 2610 ° C. and the base material (molybdenum) does not melt in ordinary welding, a high level of technology is required for welding molybdenum wires. It was a very difficult task. In addition, in any connection method using welding or bolts, the contact state of each end surface of the molybdenum wire serving as a contact surface is greatly affected by hot behavior (expansion and contraction based on temperature change). If the contact state of each end face becomes unstable or the contact portion becomes thin and thin due to aging, there is a problem that the electrical resistance at the connection portion increases.
【０００４】[0004]
【０００５】[0005]
【課題を解決するための手段】そこで、上記問題点を解
決課題として本発明のモリブデン発熱体の接続構造は、
複数のモリブデン線を接続して加熱炉用発熱体を構成す
るにあたり、モリブデン線接続部において各線端部にそ
れぞれ設けた段差を互いに面接触させた状態でその領域
の外周にモリブデン製の補助細線または補助薄板を上記
モリブデン線に沿って接触配置し、さらにその外周をモ
リブデン製保持部材により固定したものである。In order to solve the above-mentioned problems, the connection structure of the molybdenum heating element of the present invention comprises:
In forming a heating element for a heating furnace by connecting a plurality of molybdenum wires, a molybdenum auxiliary thin wire or The auxiliary thin plate is arranged in contact with the molybdenum wire and the outer periphery thereof is fixed by a molybdenum holding member.
【０００６】[0006]
【０００７】[0007]
【発明の効果】本発明のモリブデン発熱体の接続構造に
よれば、高度の技術を必要とする従来の溶接方式に比べ
て接続作業を容易にすることができる。また、モリブデ
ン線では電流が表面付近を多く流れる傾向があり、上記
補助細線または補助薄板を介しても電流が円滑に流れる
ので、モリブデン線の熱間挙動によって接触面が多少ず
れたり経年変化でやせ細っても、電流の安定した流れを
長期にわたって維持できる。According to the connection structure of a molybdenum heating element of the present invention, the connection work can be facilitated as compared with the conventional welding method requiring a high level of technology. Further, in the case of molybdenum wire, a large amount of current tends to flow in the vicinity of the surface, and the current flows smoothly even through the above-described auxiliary thin wire or auxiliary thin plate. However, a stable current flow can be maintained for a long time.
【０００８】また、上記補助細線または補助薄板はモリ
ブデン製で発熱体と同じ材料であるため熱膨張率も等し
く、常に良好な電流の流れを確保できる。Further, since the auxiliary thin wire or the auxiliary thin plate is made of molybdenum and made of the same material as the heating element, it has the same coefficient of thermal expansion and can always ensure a good current flow.
【０００９】また、上記保持部材もモリブデン製のもの
を用いており、高融点で耐熱性に優れるため発熱時にも
接続強度を維持できる。The holding member is also made of molybdenum, and has a high melting point and excellent heat resistance, so that the connection strength can be maintained even when heat is generated.
【００１０】[0010]
【００１１】したがって、本発明のモリブデン発熱体の
接続構造によれば、モリブデン線の接続部において各線
端部間の接触状態が不安定になることがなく、常に安定
した電流の流れを維持できるので、モリブデン発熱体の
接続部についてのメンテナンス頻度を低減できる。Therefore, according to the connection structure of the molybdenum heating element of the present invention, the state of contact between the ends of the molybdenum wires does not become unstable, and a stable current flow can always be maintained. In addition, the frequency of maintenance for the connection portion of the molybdenum heating element can be reduced.
【００１２】[0012]
【発明の実施の形態】以下、添付図面を参照して本発明
の実施の形態について説明する。図１から図３は、本発
明にかかるモリブデン発熱体の接続構造を適用した連続
加熱炉１０の部分断面図であり、矢印Ａ方向が炉長方
向、矢印Ｂ方向が炉幅方向を示す。この連続加熱炉１０
はれんが等の耐熱材からなる周囲壁１２を有し、この周
囲壁１２の内部に炉長方向に延びる断面矩形状の炉内空
間１４が形成されている。そして、この炉内空間１４の
ほぼ中央領域を被加熱材料である帯状金属板Ｗが矢印Ｃ
方向に連続搬送されるようになっている。Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 3 are partial cross-sectional views of a continuous heating furnace 10 to which a molybdenum heating element connection structure according to the present invention is applied, wherein the direction of arrow A indicates the furnace length direction and the direction of arrow B indicates the furnace width direction. This continuous heating furnace 10
The furnace has a peripheral wall 12 made of a heat-resistant material such as a brick. Inside the peripheral wall 12, a furnace space 14 having a rectangular cross section and extending in the furnace length direction is formed. A band-shaped metal plate W, which is a material to be heated, is positioned almost in the central region of the furnace space 14 by an arrow C.
The paper is continuously conveyed in the direction.
【００１３】上記連続加熱炉１０の炉幅方向に沿う相対
する壁面２０，２２には、炉内空間１４を加熱する発熱
体として複数のモリブデン発熱体２４が壁面２０，２２
との間に隙間をおいて配置されている。モリブデン発熱
体２４は複数のＵ字状を連ねたような形状に形成され、
その両端が炉幅方向両側の開口部２６，２６に導かれて
いる。A plurality of molybdenum heating elements 24 as heating elements for heating the furnace space 14 are provided on the opposed wall faces 20 and 22 along the furnace width direction of the continuous heating furnace 10.
Are arranged with a gap between them. The molybdenum heating element 24 is formed in a shape like a series of a plurality of U-shapes,
Both ends are guided to openings 26 on both sides in the furnace width direction.
【００１４】上記各壁面２０，２２には、これら壁面２
０，２２からモリブデン発熱体２４よりも突出した保護
壁３４，３６が設けてある。各保護壁３４，３６は、周
囲壁１２と同様にれんが等の耐熱材料で形成されてい
る。炉長方向に沿って延在する縦方向保護壁３４は二列
設けてあり、複数のモリブデン発熱体２４の設置を可能
にするために各列ごとに複数の部分に分割されている。
一方、横方向保護壁３６は炉幅方向にわたって延在して
いる。これら保護壁３４，３６がモリブデン発熱体２４
の保護構造を構成している。Each of the wall surfaces 20 and 22 has a wall surface 2
Protective walls 34 and 36 protruding from the molybdenum heating element 24 from 0 and 22 are provided. Each of the protective walls 34 and 36 is made of a heat-resistant material such as a brick, like the peripheral wall 12. The vertical protection walls 34 extending along the furnace length direction are provided in two rows, and are divided into a plurality of portions for each row so that a plurality of molybdenum heating elements 24 can be installed.
On the other hand, the lateral protection wall 36 extends in the furnace width direction. These protective walls 34, 36 are used as molybdenum heating elements 24.
Of the protection structure.
【００１５】図４は、接続部４０を含むモリブデン発熱
体２４の部分拡大図であり、つぎに図５を参照して上記
接続部４０の接続構造について説明する。この接続部４
０は、図５（ａ）に示すように、接続されるモリブデン
線の各端部２４ａ，２４ｂに同じ形状の段差を設けるよ
うに加工し、その加工面を面接触させて一本の線状にし
たのち、図５（ｂ）に示すように、その接続部領域４２
の外周に複数のモリブデン製の補助細線４６をモリブデ
ン線に沿って配置し、その上に巻き付けたモリブデン製
のワイヤ（保持部材）４８によって上記モリブデン補助
細線４６を上記各端部２４ａ，２４ｂの両方に接触した
状態に固定した構造を有している。FIG. 4 is a partially enlarged view of the molybdenum heating element 24 including the connection section 40. Next, the connection structure of the connection section 40 will be described with reference to FIG. This connection 4
5A, as shown in FIG. 5 (a), processing is performed so as to provide a step of the same shape at each end 24a, 24b of the molybdenum wire to be connected, and the processed surface is brought into surface contact to form a single linear shape. After that, as shown in FIG.
A plurality of molybdenum auxiliary thin wires 46 are arranged along the molybdenum wire on the outer periphery of the wire, and the molybdenum auxiliary fine wires 46 are wound on both ends by the molybdenum wire (holding member) 48 at both ends 24a and 24b. And has a structure fixed in contact with the
【００１６】この接続構造によれば、従来の溶接による
接続構造のように高度な技術を必要としないため、接続
作業を容易にすることができる。また、発熱時にモリブ
デン線の表面付近を多く流れる電流をモリブデン補助細
線４６を介して円滑に流すことができる。したがって、
上記各端部２４ａ，２４ｂの接触面やモリブデン線の熱
間挙動に影響されることなく、安定した電流の流れを長
期にわたって維持できる。また、モリブデンワイヤ４８
は高融点で耐熱性に優れるため、発熱体の発熱時にもモ
リブデン補助細線４６の保持強度、換言すればモリブデ
ン線の各端部２４ａ，２４ｂの接続強度を維持すること
ができる。According to this connection structure, a high level of skill is not required unlike the conventional connection structure by welding, so that the connection work can be facilitated. Further, a large amount of current flowing near the surface of the molybdenum wire during heat generation can flow smoothly via the molybdenum auxiliary thin wire 46. Therefore,
The stable current flow can be maintained for a long time without being affected by the hot behavior of the contact surfaces of the ends 24a and 24b and the molybdenum wire. The molybdenum wire 48
Since it has a high melting point and excellent heat resistance, it is possible to maintain the holding strength of the molybdenum auxiliary fine wire 46, in other words, the connection strength of the ends 24a and 24b of the molybdenum wire even when the heating element generates heat.
【００１７】なお、上記接続構造では、モリブデン線の
各端部２４ａ，２４ｂに同じ形状の段差を設ける加工を
施して接触面を形成するようにしたが、図６に示すよう
に、それぞれ異なる形状の段差部からなる凸部と凹部を
各端部２４ａ，２４ｂに設けてその凹凸部を嵌合させる
ことにより接触面を形成してもよい。In the connection structure described above, the contact surfaces are formed by forming the same shaped steps on the ends 24a and 24b of the molybdenum wires. However, as shown in FIG. The contact surface may be formed by providing a convex portion and a concave portion each having a step portion on each of the end portions 24a and 24b and fitting the concave and convex portions.
【００１８】また、上記モリブデン補助細線４６に代え
て、図７（ａ）,（ｂ）に示すように、１つ又は複数の
モリブデン補助薄板５２，５４を用いてもよい。Instead of the molybdenum auxiliary thin wire 46, one or more molybdenum auxiliary thin plates 52 and 54 may be used as shown in FIGS. 7 (a) and 7 (b).
【００１９】ところで、図２に示すように、連続搬送さ
れる帯状金属板Ｗに略Ｃ字状の反りが生じたり、あるい
は図３に示すように板破断時等に波状の振れが生じた場
合、従来の連続加熱炉では上記帯状金属板Ｗが炉内壁面
に設置したモリブデン発熱体２４に接触して該モリブデ
ン発熱体２４を破損するおそれがあった。しかし、上記
縦方向保護壁３４および横方向保護壁３６からなる保護
構造によれば、帯状金属板Ｗに上記のような反りや振れ
が生じても各保護壁３４，３６によってモリブデン発熱
体２４に接触するのを防止できる。By the way, as shown in FIG. 2, a substantially C-shaped warp is generated in the strip-shaped metal plate W which is continuously conveyed, or a wave-like deflection is generated when the plate is broken as shown in FIG. In the conventional continuous heating furnace, the strip-shaped metal plate W may contact the molybdenum heating element 24 installed on the inner wall surface of the furnace and damage the molybdenum heating element 24. However, according to the protection structure including the vertical protection wall 34 and the horizontal protection wall 36, even if the above-described warping or deflection occurs in the strip-shaped metal plate W, the protection walls 34 and 36 cause the molybdenum heating element 24 to have an effect. Contact can be prevented.
【００２０】なお、上記各保護壁３４，３６は炉長方向
または炉幅方向に延在するように形成したが、各保護壁
３４，３６の位置、突出形状、大きさ等は同様の効果を
奏する範囲内において種々の変更が可能である。また、
上記保護構造はモリブデン発熱体以外の発熱体を用いた
連続加熱炉にも応用できることは言うまでもない。Although the protective walls 34 and 36 are formed so as to extend in the furnace length direction or the furnace width direction, the position, the projecting shape, the size, and the like of the protective walls 34 and 36 have the same effect. Various changes are possible within the range of performance. Also,
It goes without saying that the above protective structure can be applied to a continuous heating furnace using a heating element other than the molybdenum heating element.
【００２１】以上に説明したように、上記モリブデン発
熱体の接続構造および保護構造によれば、接続部におけ
る接触状態が不安定になったり、あるいは帯状金属板と
の接触による破損が原因でモリブデン発熱体を交換する
ことがなくなるので、モリブデン発熱体の長寿命化を図
ることができ、メンテナンス頻度を低減できる。As described above, according to the connection structure and the protection structure of the molybdenum heating element, the contact state at the connection portion becomes unstable or the molybdenum heating element is damaged due to the contact with the strip-shaped metal plate. Since there is no need to replace the body, the life of the molybdenum heating element can be extended, and the frequency of maintenance can be reduced.
【図１】 本発明にかかるモリブデン発熱体の接続構造
を適用した連続加熱炉の部分断面図である。FIG. 1 is a partial cross-sectional view of a continuous heating furnace to which a molybdenum heating element connection structure according to the present invention is applied.
【図２】 図１におけるＩＩ−ＩＩ線断面図である。FIG. 2 is a sectional view taken along line II-II in FIG.
【図３】 図２におけるＩＩＩ−ＩＩＩ線断面図であ
る。FIG. 3 is a sectional view taken along line III-III in FIG.
【図４】 接続部を含むモリブデン発熱体の部分拡大図
である。FIG. 4 is a partially enlarged view of a molybdenum heating element including a connection portion.
【図５】 （ａ）は接続されるモリブデン線の各端部を
面接触させて一本の線状にした状態を示し、（ｂ）はそ
の接続部領域の周囲にモリブデン補助細線を設けた接続
構造を示した図である。FIG. 5 (a) shows a state in which each end of a molybdenum wire to be connected is brought into surface contact to form a single line, and FIG. 5 (b) shows a molybdenum auxiliary thin wire provided around the connection region. It is a figure showing a connection structure.
【図６】 モリブデン線の各端部の接触状態の変形例を
示す図である。FIG. 6 is a view showing a modified example of a contact state of each end of a molybdenum wire.
【図７】 （ａ），（ｂ）共に、モリブデン発熱体の接
続構造にモリブデン薄板を用いた変形例を示す図であ
る。FIGS. 7 (a) and 7 (b) are diagrams showing modified examples in which a molybdenum thin plate is used for a connection structure of a molybdenum heating element.
【図８】 溶接による従来のモリブデン発熱体の接続構
造を示す図である。FIG. 8 is a diagram showing a connection structure of a conventional molybdenum heating element by welding.
【図９】 ボルト止めによる従来のモリブデン発熱体の
接続構造を示す図である。FIG. 9 is a diagram showing a conventional molybdenum heating element connection structure by bolting.
１０…連続加熱炉、２４…モリブデン発熱体、２４ａ，
２４ｂ…モリブデン線の各端部、４６…モリブデン補助
細線、４８…モリブデンワイヤ（保持部材）、５２，５
４…モリブデン補助薄板。10: continuous heating furnace, 24: molybdenum heating element, 24a,
24b: each end of molybdenum wire; 46, molybdenum auxiliary fine wire; 48, molybdenum wire (holding member);
4 ... Molybdenum auxiliary thin plate.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平６−277776（ＪＰ，Ａ) 特開 平８−124662（ＪＰ，Ａ) 特開 昭54−87951（ＪＰ，Ａ) 実開 昭61−87689（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.6，ＤＢ名) H05B 3/02 F27D 11/02 H05B 3/12 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-277776 (JP, A) JP-A-8-124662 (JP, A) JP-A-54-87951 (JP, A) 87689 (JP, U) (58) Field surveyed (Int. Cl. 6 , DB name) H05B 3/02 F27D 11/02 H05B 3/12
Claims (1)
発熱体を構成するにあたり、モリブデン線接続部におい
て各線端部にそれぞれ設けた段差を互いに面接触させた
状態でその領域の外周にモリブデン製の補助細線または
補助薄板を上記モリブデン線に沿って接触配置し、さら
にその外周をモリブデン製保持部材により固定したモリ
ブデン発熱体の接続構造。When a plurality of molybdenum wires are connected to form a heating element for a heating furnace, molybdenum wires are connected to the outer periphery of a molybdenum wire connecting portion in a state where steps provided at ends of the wires are in surface contact with each other. Connection structure of a molybdenum heating element in which an auxiliary thin wire or an auxiliary thin plate made of aluminum is arranged in contact with the molybdenum wire and the outer periphery thereof is fixed by a molybdenum holding member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8330854A JP2983918B2 (en) | 1996-12-11 | 1996-12-11 | Molybdenum heating element connection structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8330854A JP2983918B2 (en) | 1996-12-11 | 1996-12-11 | Molybdenum heating element connection structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10172722A JPH10172722A (en) | 1998-06-26 |
| JP2983918B2 true JP2983918B2 (en) | 1999-11-29 |
Family
ID=18237279
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8330854A Expired - Fee Related JP2983918B2 (en) | 1996-12-11 | 1996-12-11 | Molybdenum heating element connection structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2983918B2 (en) |
-
1996
- 1996-12-11 JP JP8330854A patent/JP2983918B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10172722A (en) | 1998-06-26 |
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