JPH0714797Y2 - Suspended furnace muffle - Google Patents
Suspended furnace muffleInfo
- Publication number
- JPH0714797Y2 JPH0714797Y2 JP3637391U JP3637391U JPH0714797Y2 JP H0714797 Y2 JPH0714797 Y2 JP H0714797Y2 JP 3637391 U JP3637391 U JP 3637391U JP 3637391 U JP3637391 U JP 3637391U JP H0714797 Y2 JPH0714797 Y2 JP H0714797Y2
- Authority
- JP
- Japan
- Prior art keywords
- muffle
- unit
- furnace
- plate thickness
- muffles
- 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 - Lifetime
Links
Landscapes
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Tunnel Furnaces (AREA)
- Muffle Furnaces And Rotary Kilns (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本考案は吊下げ式炉内マッフルに
関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hanging muffle in a furnace.
【０００２】[0002]
【従来の技術と考案が解決しようとする課題】従来、竪
型マッフル式連続熱処理炉における炉内マッフルは、そ
の上端部を固定点として吊下げ方式となっている。とこ
ろで、この炉内マッフルは、その表面がバーナあるい
は、電熱ヒータ等の加熱手段により高温に曝されること
と、上端部を固定点として吊下げられ、その重量が上端
部にかかるため、その板厚は、マッフル材における高温
クリープ制限応力内で、炉操業条件等により決定され、
全長にわたってこの決定された厚みとなっている。した
がって、炉温が１１５０℃であれば、重量上の制限から
マッフル長さは７〜９ｍ程度であり、生産量の増大に対
処するために、炉の大形化（加熱帯の延長）を図るにも
制限があった。2. Description of the Related Art Conventionally, an in-furnace muffle in a vertical muffle-type continuous heat treatment furnace is of a hanging type with its upper end being a fixed point. By the way, since the surface of the muffle in the furnace is exposed to a high temperature by a heating means such as a burner or an electric heater, and the upper end portion is suspended as a fixed point, and the weight thereof is applied to the upper end portion, the plate The thickness is determined by the furnace operating conditions, etc. within the high temperature creep limiting stress in the muffle material,
This is the determined thickness over the entire length. Therefore, if the furnace temperature is 1150 ° C., the muffle length is about 7 to 9 m due to the weight limitation, and the size of the furnace is increased (the heating zone is extended) in order to cope with the increase in the production amount. There was also a limit.
【０００３】そこで出願人は、特公平２−２０７３号公
報で、前記マッフルを板厚の異なる複数の単位マッフル
で構成し、最上部の単位マッフルの板厚が最大で、順
次、下方になるにしたがって板厚が減少するようにした
吊下げ式炉内マッフルを提案した。この方式では、理論
的には最上部の単位マッフルの板厚を増大すれば、マッ
フルをかなり長大化することができる。しかしながら、
マッフルは外部から熱を受け、内部に熱を与える役目が
あるが、板厚が２０ｍｍを越えると、伝熱量が制限され
たり、内外面の温度差が大となり、破損する危険性があ
るため、炉温が１１５０℃でマッフル長さは１８ｍ位が
限度であった。本考案は、前記公報に示される技術をさ
らに発展させて、より長大化を図ることのできる吊下げ
式炉内マッフルを提供することを目的とする。Therefore, the applicant, in Japanese Patent Publication No. 22073/1990, configures the muffler with a plurality of unit muffles having different plate thicknesses, and the platen thickness of the uppermost unit muffler is the maximum, and the muffler is successively lowered. Therefore, we proposed a suspended muffle in the furnace with a reduced plate thickness. In this system, theoretically, the muffle can be considerably lengthened by increasing the plate thickness of the uppermost unit muffle. However,
The muffle has a role of receiving heat from the outside and giving heat to the inside, but if the plate thickness exceeds 20 mm, the amount of heat transfer is limited or the temperature difference between the inner and outer surfaces becomes large, and there is a risk of damage. The furnace temperature was 1150 ° C, and the muffle length was limited to about 18 m. An object of the present invention is to further develop the technique disclosed in the above publication to provide a hanging-type in-reactor muffle that can be made longer.
【０００４】[0004]
【課題を解決するための手段】本考案は、前記目的を達
成するために、板厚の異なる複数の単位マッフルからな
る吊下げ式炉内マッフルにおいて、最小板厚の単位マッ
フルの上，下端に前記単位マッフルより板厚が大なる単
位マッフルを接続するとともに、最下部の単位マッフル
に圧縮荷重付与装置を設けた構成としたものである。Means for Solving the Problems In order to achieve the above object, the present invention relates to a hanging-type in-furnace muffle composed of a plurality of unit muffles having different plate thicknesses. A unit muffle having a plate thickness larger than that of the unit muffle is connected, and a compression load applying device is provided in the lowest unit muffle.
【０００５】[0005]
【実施例】つぎに、本考案の一実施例を図１にしたがっ
て説明する。本考案にかかるマッフル１は、板厚の異な
る複数の単位マッフル１ａ，１ｂ，１ｃ…，１ａ′，１
ｂ′…からなり、板厚は、１ａ＞１ｂ＞１ｃ，１ａ′＞
１ｂ′＞１ｃとなっている。そして、図においては、前
記マッフル１は、最小板厚の単位マッフル１ｃの上，下
端に単位マッフル１ｂ，１ｂ′を熔接し、さらに、単位
マッフル１ｂ，１ｂ′の他端に最大板厚の単位マッフル
１ａ，１ａ′を熔接して一体化し、最上部単位マッフル
１ａに取り付けた上フランジ２を、図示しない炉頂部に
設けた基台上に固定される。つまり、単位マッフルの上
方部は、前記公報に記載の構成である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIG. The muffle 1 according to the present invention comprises a plurality of unit muffles 1a, 1b, 1c ..., 1a ', 1 having different plate thicknesses.
b '... and the plate thickness is 1a>1b> 1c, 1a'>
1b '> 1c. In the figure, the muffle 1 has unit muffles 1b and 1b 'welded to the upper and lower ends of the unit muffle 1c having the minimum plate thickness, and the maximum plate thickness unit to the other end of the unit muffles 1b and 1b'. The muffles 1a and 1a 'are welded and integrated, and the upper flange 2 attached to the uppermost unit muffle 1a is fixed onto a base provided at the furnace top (not shown). That is, the upper part of the unit muffle has the configuration described in the above publication.
【０００６】本考案においては、前記マッフル１の最下
部単位マッフル１ａ′にも下フランジ３を設け、この下
フランジ３に定滑車５、ワイヤ６、ウエイト７からなる
圧縮荷重付与装置４により、例えば、単位マッフル１ｃ
の中央より下方の自重に等しい力を上方向に加え、マッ
フル１の上部にかかる引張力を減少させるようにしたも
のである。前記実施例では、最小板厚の単位マッフル１
ｃを中心に上，下に各々二つの単位マッフル１ｂ，１
ａ，１ｂ′，１ａ′を接続したが、単位マッフルの接続
個数はこれに限らない。また、接続する各単位マッフル
１ｂ，１ｂ′および１ａ，１ａ′は同一板厚である必要
はない。なお、下部圧縮域（図２参照）が大きいと、圧
縮力も大きくなりこの部分の単位マッフルが座屈を生じ
る恐れがあるため、最小板厚の単位マッフル１ｃは、マ
ッフル１の最下端から１／３位に配置するようにするの
が望ましい。図において、Ｗは金属ストリップである。In the present invention, the lowermost unit muffle 1a 'of the muffle 1 is also provided with a lower flange 3, and the lower flange 3 is provided with a compression load applying device 4 comprising a constant pulley 5, a wire 6 and a weight 7, for example. , Unit muffle 1c
A force equal to its own weight below the center of the muffle 1 is applied in the upward direction to reduce the tensile force applied to the upper part of the muffle 1. In the above-mentioned embodiment, the unit muffle 1 of the minimum plate thickness
There are two unit muffles 1b and 1 above and below the center of c.
Although a, 1b ', and 1a' are connected, the number of connected unit muffles is not limited to this. The unit muffles 1b, 1b 'and 1a, 1a' to be connected do not have to have the same plate thickness. If the lower compression region (see FIG. 2) is large, the compression force will be large and the unit muffle of this part may cause buckling. Therefore, the unit muffle 1c having the minimum plate thickness is 1 / m from the lowermost end of the muffle 1. It is desirable to place it in 3rd place. In the figure, W is a metal strip.
【０００７】[0007]
【考案の効果】以上の説明で明らかなように、本考案
は、板厚の異なる複数の単位マッフルからなる吊下げ式
炉内マッフルにおいて、最小板厚の単位マッフルの上，
下端に前記単位マッフルより板厚が大なる単位マッフル
を接続するとともに、最下部の単位マッフルに圧縮荷重
付与装置を設けた構成であり、マッフルの最下部から上
方へ圧縮荷重を付与するため、マッフルの上端部にかか
る引張力が小さくなる。つまり、マッフル長を従来と同
一長さとすれば、最大板厚は小さく、熱的な問題は解消
される。また、一般に、炉内マッフルは、高価な高級耐
熱鋼を使用するため、同一長さの炉内マッフルでは、従
来のものより安価である。さらに、最大板厚を同じにす
れば、より長大なマッフルを得ることができる。たとえ
ば、マッフル温度１１５０℃、マッフル材料のクリープ
制限応力を０．０７ｋｇ／ｍｍ2とし、マッフルの最上
部の単位マッフルの厚みを１８ｍｍとした場合、前記公
報のものでは全長が１９．５ｍが限度であるが、本考案
によれば２９ｍとすることができる。As is apparent from the above description, the present invention is a suspension type in-furnace muffle consisting of a plurality of unit muffles having different plate thicknesses.
A unit muffle having a plate thickness larger than that of the unit muffle is connected to the lower end, and a compressive load applying device is provided in the lowermost unit muffle, so that the compressive load is applied upward from the lowermost part of the muffle. The tensile force applied to the upper end of the is reduced. That is, if the muffle length is the same as the conventional one, the maximum plate thickness is small, and the thermal problem is solved. Further, since the in-furnace muffle generally uses expensive high-grade heat-resistant steel, the in-furnace muffle having the same length is cheaper than the conventional one. Further, if the maximum plate thickness is the same, a longer muffle can be obtained. For example, when the muffle temperature is 1150 ° C., the creep limiting stress of the muffle material is 0.07 kg / mm 2, and the thickness of the unit muffle at the top of the muffle is 18 mm, the length of the above publication is limited to 19.5 m. However, according to the present invention, the length can be 29 m.
【図１】 本考案にかかるマッフルの断面図。FIG. 1 is a sectional view of a muffle according to the present invention.
【図２】 図１のマッフルにかかる引張力と圧縮力との
関係を示す図。FIG. 2 is a diagram showing a relationship between a tensile force and a compressive force applied to the muffle of FIG.
１…マッフル、１ａ，１ｂ，１ａ′，１ｂ′…単位マッ
フル、１ｃ…最小板厚の単位マッフル、４…圧縮荷重付
与装置。1 ... Muffle, 1a, 1b, 1a ', 1b' ... Unit muffle, 1c ... Unit muffle of minimum plate thickness, 4 ... Compressive load applying device.
Claims (1)
る吊下げ式炉内マッフルにおいて、最小板厚の単位マッ
フルの上，下端に前記単位マッフルより板厚が大なる単
位マッフルを接続するとともに、最下部の単位マッフル
に圧縮荷重付与装置を設けたことを特徴とする吊下げ式
炉内マッフル。1. In a hanging-type in-furnace muffle composed of a plurality of unit muffles having different plate thicknesses, unit muffles having a plate thickness larger than the unit muffle are connected to upper and lower ends of the unit muffle having the minimum plate thickness, and A suspended muffle in the furnace, which is equipped with a compressive load applying device in the lowest unit muffle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3637391U JPH0714797Y2 (en) | 1991-05-22 | 1991-05-22 | Suspended furnace muffle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3637391U JPH0714797Y2 (en) | 1991-05-22 | 1991-05-22 | Suspended furnace muffle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04132395U JPH04132395U (en) | 1992-12-08 |
| JPH0714797Y2 true JPH0714797Y2 (en) | 1995-04-10 |
Family
ID=31918326
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3637391U Expired - Lifetime JPH0714797Y2 (en) | 1991-05-22 | 1991-05-22 | Suspended furnace muffle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0714797Y2 (en) |
-
1991
- 1991-05-22 JP JP3637391U patent/JPH0714797Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04132395U (en) | 1992-12-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |