JP2004223527A - Protective cover, and molten metal retaining furnace - Google Patents

Protective cover, and molten metal retaining furnace Download PDF

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Publication number
JP2004223527A
JP2004223527A JP2003011341A JP2003011341A JP2004223527A JP 2004223527 A JP2004223527 A JP 2004223527A JP 2003011341 A JP2003011341 A JP 2003011341A JP 2003011341 A JP2003011341 A JP 2003011341A JP 2004223527 A JP2004223527 A JP 2004223527A
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Prior art keywords
molten metal
protective cover
protective
ceramic
holding furnace
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JP2003011341A
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Japanese (ja)
Inventor
Yoichi Seki
陽一 関
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Nissin Kogyo Co Ltd
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Nissin Kogyo Co Ltd
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Priority to JP2003011341A priority Critical patent/JP2004223527A/en
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  • Vertical, Hearth, Or Arc Furnaces (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a protective cover capable of easily removing an adhering layer adhering to a molten metal immersion member such as a protective pipe of a temperature sensor partially immersed into molten metal stored in a molten metal bath. <P>SOLUTION: The protective cover 24 is fitted to the protective pipe 20 of the temperature sensor partially immersed into molten metal stored in the water bath 22. The protective cover 24 is formed of a ceramic paper sheet chemically and physically stable to the molten metal 22, and surrounds the outer circumference of the part equivalent to the face of the molten metal liquid in the protective pipe 20 and its vicinity attachably and detachably. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は保護カバー及び溶湯保持炉に関し、更に詳細には湯浴に貯留された金属の溶湯に、部分的に浸漬される配管や温度センサの保護管等の溶湯浸漬部材に装着される保護カバー及び前記保護カバーが装着された溶湯浸漬部材が用いられた溶湯保持炉に関する。
【０００２】
【従来の技術】
アルミニウム等の金属の鋳造には、図３に示す様に、金属を熔かした溶湯を貯留しておく溶湯保持炉１０が用いられている。かかる溶湯保持炉１０には、溶湯を成形型等に送り出す送湯ポンプ１２が設けられている。この送湯ポンプ１２は、モータ等の送湯駆動装置１４によって駆動され、導管１６を介して成形型等に溶湯を送り出す。
かかる溶湯保持炉１０には、下記特許文献１に記載されている様に、溶湯を貯留する湯浴内の溶湯を加熱する加熱ヒータが設けられている。この加熱ヒータは、図４に示す様に、セラミック製の保護管１００内に収納されて溶湯１０４内に挿入されている。更に、溶湯の温度検出に用いられる熱伝対等の温度センサも、同様に、セラミック製の保護管内に挿入されて溶湯１０４内に挿入されている。
【０００３】
【特許文献１】
特開２００１−３１６７３３号公報（図１）
【０００４】
【発明が解決しようとする課題】
かかる加熱ヒータや温度センサによって、溶湯保持炉１０内の湯浴内の溶湯を所定温度に保持できる。
ところで、保護管１００は、図４に示す如く、溶湯１０４が貯留される湯浴の壁１８を貫通し、その先端部が溶湯１０４内に浸漬されている。
このため、保護管１００の中途部は、溶湯１０４の液面に接触している。かかる溶湯の液面には、空気中の酸素と接触して形成された酸化物被膜が形成されている。この酸化物被膜は、溶湯の液面と接触している保護管１００の中途部の外周面にも付着し、次第に蓄積する。
かかる酸化物被膜等が保護管１００の外周面に次第に蓄積とすると、保護管１００の熱伝導性等の特性が低下するため、保護管１００を抜き出して付着した付着層を除去することが行われている。
【０００５】
しかしながら、保護管１００に付着した付着層の除去は容易ではなく、例えば酸に溶解させる等の除去手段を採用せざるを得ず、相当の時間と経費とを必要としていた。
また、かかる除去手段を施しても付着層を充分に除去できない場合には、保護管１００を廃棄処分とせざるを得ず、加熱ヒータや温度センサ等の各々に用いられる各種保護管の予備品を常に保管していることを要する。
そこで、本発明の課題は、湯浴内に貯留された金属の溶湯に部分的に浸漬される温度センサの保護管等の溶湯浸漬部材に付着する付着層を容易に除去し得る除去手段及び前記除去手段を具備する溶湯浸漬部材を装着した溶湯保持炉を提供することにある。
【０００６】
【課題を解決するための手段】
本発明者は、前記課題を解決するには、除去手段として、保護管の溶湯液面及びその近傍に相当する部分の外周囲に着脱自在に装着できる保護カバーを用いることが有効と考え検討した結果、本発明に到達した。
すなわち、本発明は、湯浴内に貯留された金属の溶湯に部分的に浸漬される配管や温度センサの保護管等の溶湯浸漬部材に装着される保護カバーであって、該保護カバーが、前記溶湯に対して化学的及び物理的に安定している材料によって形成され、且つ前記溶湯浸漬部材の溶湯液面及びその近傍に相当する部分の外周囲に着脱可能に囲繞されていることを特徴とする保護カバーにある。
また、本発明は、湯浴内に貯留された金属の溶湯に、部分的に浸漬される配管や温度センサの保護管等の溶湯浸漬部材が設けられた溶湯保持炉において、該溶湯浸漬部材の溶湯液面及びその近傍に相当する部分の外周囲に、前記溶湯に対して化学的及び物理的に安定している材料から成る保護カバーが着脱可能に囲繞されていることを特徴とする溶湯保持炉でもある。
【０００７】
かかる本発明において、セラミック製の短繊維を抄紙して得たセラミックペーパーを、保護管等の所定部分に巻き付けて保護カバーを形成することによって、保護管等の任意の箇所に容易に保護カバーを形成できる。
また、セラミック製の筒体が分割された分割体から成る保護カバーを用いることによって、保護管等の所定部分に保護カバーを容易に着脱自在に装着できる。
【０００８】
本発明に係る保護カバーを、保護管等の溶湯浸漬部材の溶湯液面及びその近傍に相当する部分の外周囲に着脱可能に囲繞することによって、溶湯の液面に形成された酸化物被膜は保護カバーに付着して付着層を形成する。
かかる付着層は、保護管等の溶湯浸漬部材を抜き出して保護カバーを取り外すことによって容易に除去できる。
ここで、付着層は主として保護カバーに付着するため、例え、保護管等の溶湯浸漬部材の周面にも酸化物被膜が付着しても、その付着量は少量であり容易に除去できる。
【０００９】
【発明の実施の形態】
本発明において用いる溶湯保持炉は、図３に示す溶湯保持炉１０を用いることができる。このため、図３に示す溶湯保持炉１０に設けられている送湯ポンプ、送湯駆動装置及び導管は、図３に示すものと同一物を用いることができ、図３と同一番号を付して詳細な説明を省略する。
かかる溶湯保持炉１０内に保持されているアルミニウム等の金属の溶湯には、図１に示す様に、温度センサ等が収容されたセラミック製の保護管２０が、溶湯２２を貯留している湯浴の壁１８を貫通し、その先端部が溶湯２２内に挿入されている。
この保護管２０の溶湯液面及びその近傍に相当する部分の外周囲に、保護カバー２４が着脱自在に囲繞されている。
かかる保護カバー２４は、浸漬される溶湯に対して化学的及び物理的に安定している材料によって形成されていることを要する。
このため、溶湯に対して化学的及び物理的に安定しているセラミックから成る保護カバー２４を好適に用いることができる。
かかるセラミックから成る保護カバー２４としては、セラミックペーパーから成る保護カバー２４を挙げることができる。かかるセラミックペーパーは、セラミック製の短繊維に少量の有機バインダーを加え、抄造機によって抄紙して得られたものである。得られたセラミックペーパーは、溶湯に対して化学的に安定であり且つ耐熱性にも優れていることは勿論のこと、柔軟性に富んでおり、折り曲げできるものである。
【００１０】
かかるセラミックペーパーを用いて保護カバー２４を形成する際には、セラミックペーパーを所定幅の帯状体に切断し、この帯状体を保護管２０の溶湯液面及びその近傍に相当する部分の外周囲に巻き付けることによって保護カバー２４を形成できる。
この際に、保護管２０に巻き付けた帯状体上に、例えば紐状の止め具を巻き付けることによって、保護カバー２４を保護管２０に容易に装着でき、巻き付けた紐状の止め具を巻き戻すことによって保護カバー２４を保護管２０から容易に取り外すことができる。
尚、かかるセラミックペーパーの巻付数は、溶湯２２を貯留している湯浴の壁１８から保護管２０を容易に引き抜ける範囲内で、二重巻き以上としてもよい。
【００１１】
かかるセラミックペーパーから成る保護カバー２４に代えて、図２に示す様に、セラミック製の筒体を分割した分割体２６ａ，２６ａを、保護管２０に押し付けて形成した保護カバー２６であってもよい。
かかる保護カバー２６も、保護管２０に押し付けた分割体２６ａ，２６ａ上に紐状の止め具を巻き付けることによって、形成された保護カバー２６を保護管２０に容易に装着でき、巻き付けた紐状の止め具を巻き戻すことによって保護カバー２６を分割体２６ａ，２６ａに分割して保護管２０から容易に取り外すことができる。
ここで、セラミックペーパーから成る保護カバー２４を保護管２０に装着する際に用いる紐状の止め具、或いはセラミック製の分割体２６ａ，２６ａから成る保護カバー２６を保護管２０に装着する際に用いる紐状の止め具は、浸漬される溶湯に対して化学的及び物理的に安定している材料によって形成されているものであって、例えばアルミニウムの溶湯の場合は、セラミックから成る線状の止め具を好適に用いることができる。
【００１２】
また、保護カバー２４又は保護カバー２６を保護管２０に装着する際に、保護管２０に予めフック等の引掛けを形成しておき、この引掛けにセラミックペーパー又は分割体２６ａ，２６ａを引掛けて形成した保護カバー２４又は保護カバー２６を保護管２０に装着するようにしてもよい。
更に、図１及び図２には、温度センサ等が収容されたセラミック製の保護管２０に着脱自在に装着する保護カバー２４（２６）について説明したが、加熱ヒータを収容する保護管にも、同様に保護カバー２４（２６）を装着できる。
また、溶湯に部分的に浸漬する配管や送湯ポンプ１２の溶湯液面及びその近傍に相当する部分の外周囲にも、保護カバー２４（２６）を装着することによって酸化物被膜が付着して形成される付着層を容易に除去できる。
【００１３】
【発明の効果】
本発明によれば、保護管等の溶湯液面及びその近傍に相当する部分の外周囲に付着する付着層の除去を容易に行うことができ、付着層の除去に要する時間と経費とを軽減できる。
また、付着層の除去が困難であることに起因して廃棄する保護管等を減少でき、保護管等の予備品の保管量を減少できる。
【図面の簡単な説明】
【図１】本発明に係る保護カバーを装着した状態を説明する部分断面図である。
【図２】本発明に係る保護カバーの他の例を説明する横断面図である。
【図３】溶湯保持炉の一例の概略を説明する説明図である。
【図４】溶湯保持炉に保持された溶湯内に先端部が浸漬された保護管を説明する部分断面図である。
【符号の説明】
１０ 溶湯保持炉
１２ 送湯ポンプ
１４ 送湯駆動装置
１６ 導管
１８ 壁
２０ 保護管
２２ 溶湯
２４，２６ 保護カバー
２６ａ，２６ａ 分割体[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a protective cover and a molten metal holding furnace, and more particularly to a protective cover attached to a molten metal immersion member such as a pipe partially immersed in a molten metal stored in a hot water bath or a protective tube of a temperature sensor. And a molten metal holding furnace using a molten metal immersion member provided with the protective cover.
[0002]
[Prior art]
For casting of a metal such as aluminum, as shown in FIG. 3, a molten metal holding furnace 10 for storing a molten metal obtained by melting a metal is used. The molten metal holding furnace 10 is provided with a hot water pump 12 for feeding the molten metal to a molding die or the like. The hot water supply pump 12 is driven by a hot water supply drive device 14 such as a motor, and sends out molten metal to a forming die or the like via a conduit 16.
As described in Patent Literature 1 below, the molten metal holding furnace 10 is provided with a heater for heating the molten metal in a bath for storing the molten metal. This heater is housed in a ceramic protection tube 100 and inserted into a molten metal 104 as shown in FIG. Further, a temperature sensor such as a thermocouple used for detecting the temperature of the molten metal is similarly inserted into the protection tube made of ceramic and inserted into the molten metal 104.
[0003]
[Patent Document 1]
JP 2001-316733 A (FIG. 1)
[0004]
[Problems to be solved by the invention]
With such a heater and a temperature sensor, the molten metal in the bath in the molten metal holding furnace 10 can be maintained at a predetermined temperature.
By the way, as shown in FIG. 4, the protective tube 100 penetrates a wall 18 of a hot water bath in which the molten metal 104 is stored, and a tip portion is immersed in the molten metal 104.
Therefore, the middle part of the protection tube 100 is in contact with the liquid level of the molten metal 104. An oxide film formed in contact with oxygen in the air is formed on the liquid surface of the molten metal. The oxide film also adheres to the outer peripheral surface of the protective tube 100 in contact with the liquid level of the molten metal and accumulates gradually.
If such an oxide film or the like gradually accumulates on the outer peripheral surface of the protection tube 100, the properties such as the thermal conductivity of the protection tube 100 deteriorate. Therefore, the protection tube 100 is extracted and the attached layer is removed. ing.
[0005]
However, it is not easy to remove the adhered layer adhered to the protective tube 100. For example, a removal means such as dissolving in an acid has to be adopted, and considerable time and expense are required.
Further, when the adhesion layer cannot be sufficiently removed even by performing such a removing means, the protection tube 100 must be disposed of, and spare parts of various protection tubes used for each of the heater, the temperature sensor, and the like must be used. It must be kept at all times.
Therefore, an object of the present invention is to provide a removing means capable of easily removing an adhesion layer adhering to a molten metal immersion member such as a protective tube of a temperature sensor which is partially immersed in a molten metal of a metal stored in a hot water bath. An object of the present invention is to provide a molten metal holding furnace equipped with a molten metal immersion member having a removing means.
[0006]
[Means for Solving the Problems]
The present inventor has considered and considered that it is effective to use a protective cover that can be detachably attached to the outer periphery of a portion corresponding to the molten liquid surface of the protective tube and the vicinity thereof as the removing means in order to solve the above-described problem. As a result, the present invention has been achieved.
That is, the present invention is a protective cover attached to a molten metal immersion member such as a pipe partially immersed in a molten metal stored in a hot water bath or a protective tube of a temperature sensor, wherein the protective cover is It is formed of a material that is chemically and physically stable with respect to the molten metal, and is removably surrounded around the liquid surface of the molten metal immersion member and a portion corresponding to the vicinity thereof. And in the protective cover.
Further, the present invention provides a molten metal holding furnace provided with a molten metal immersion member such as a pipe partially immersed in a molten metal stored in a hot water bath or a protective tube of a temperature sensor. A molten metal holding, characterized in that a protective cover made of a material that is chemically and physically stable with respect to the molten metal is removably surrounded around the molten metal surface and a portion corresponding to the vicinity thereof. It is also a furnace.
[0007]
In the present invention, by forming a protective cover by wrapping a ceramic paper obtained by paper-making ceramic short fibers around a predetermined portion of the protective tube or the like, the protective cover can be easily attached to an arbitrary position of the protective tube or the like. Can be formed.
In addition, by using a protective cover composed of a divided body obtained by dividing a ceramic cylinder, the protective cover can be easily and detachably attached to a predetermined portion such as a protective tube.
[0008]
By surrounding the protective cover according to the present invention removably around the liquid surface of the molten liquid immersion member such as a protective tube and a portion corresponding to the vicinity thereof, the oxide film formed on the liquid surface of the molten metal is removed. Adhering to the protective cover to form an adhesion layer.
Such an adhesion layer can be easily removed by extracting a molten metal immersion member such as a protective tube and removing a protective cover.
Here, since the adhered layer mainly adheres to the protective cover, even if the oxide film adheres to the peripheral surface of the molten metal immersion member such as a protective tube, the amount of the adhered layer is small and can be easily removed.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
As the molten metal holding furnace used in the present invention, the molten metal holding furnace 10 shown in FIG. 3 can be used. For this reason, the same pump as that shown in FIG. 3 can be used for the hot water pump, hot water drive device and conduit provided in the molten metal holding furnace 10 shown in FIG. And a detailed description is omitted.
As shown in FIG. 1, as shown in FIG. 1, a ceramic protective tube 20 containing a temperature sensor and the like is used for holding a molten metal 22 in a molten metal such as aluminum held in the molten metal holding furnace 10. It penetrates the bath wall 18 and its tip is inserted into the melt 22.
A protective cover 24 is detachably surrounded around the liquid surface of the protective tube 20 and a portion corresponding to the vicinity thereof.
The protective cover 24 needs to be formed of a material that is chemically and physically stable with respect to the molten metal to be immersed.
For this reason, the protective cover 24 made of ceramic which is chemically and physically stable with respect to the molten metal can be suitably used.
As the protective cover 24 made of such a ceramic, the protective cover 24 made of a ceramic paper can be cited. Such ceramic paper is obtained by adding a small amount of an organic binder to short fibers made of ceramic and making the paper by a paper machine. The obtained ceramic paper is not only chemically stable to the molten metal and excellent in heat resistance but also has high flexibility and can be bent.
[0010]
When forming the protective cover 24 using such ceramic paper, the ceramic paper is cut into a band having a predetermined width, and the band is placed around the molten liquid surface of the protective tube 20 and a portion corresponding to the vicinity thereof. The protective cover 24 can be formed by winding.
At this time, the protective cover 24 can be easily attached to the protective tube 20 by winding, for example, a string-shaped stopper on the belt-shaped body wound around the protective tube 20, and the wound string-shaped stopper can be unwound. Thus, the protective cover 24 can be easily removed from the protective tube 20.
The number of windings of the ceramic paper may be double or more as long as the protective tube 20 is easily pulled out from the wall 18 of the hot water bath storing the molten metal 22.
[0011]
Instead of the protective cover 24 made of ceramic paper, a protective cover 26 formed by pressing a divided body 26a, 26a obtained by dividing a ceramic cylinder into a protective tube 20 as shown in FIG. .
Such a protective cover 26 can also be easily attached to the protective tube 20 by winding a string-shaped stopper on the divided bodies 26a, 26a pressed against the protective tube 20. By unwinding the stopper, the protective cover 26 can be divided into divided bodies 26a, 26a and easily detached from the protective tube 20.
Here, a string-shaped stopper used when attaching the protective cover 24 made of ceramic paper to the protective tube 20, or used when attaching the protective cover 26 made of ceramic divided bodies 26a, 26a to the protective tube 20. The string-shaped stopper is made of a material that is chemically and physically stable with respect to the molten metal to be immersed. For example, in the case of molten aluminum, a linear stopper made of ceramic is used. Tool can be suitably used.
[0012]
When attaching the protective cover 24 or the protective cover 26 to the protective tube 20, a hook such as a hook is formed in advance on the protective tube 20, and the ceramic paper or the divided bodies 26a, 26a are hooked on the hook. The protective cover 24 or the protective cover 26 formed as described above may be attached to the protective tube 20.
1 and 2, the protection cover 24 (26) detachably attached to the ceramic protection tube 20 containing the temperature sensor and the like has been described. Similarly, the protective cover 24 (26) can be attached.
Also, by attaching the protective cover 24 (26) to the outer periphery of the pipe which is partially immersed in the molten metal, the molten liquid surface of the hot water supply pump 12 and a portion corresponding to the vicinity thereof, the oxide film adheres. The formed adhesion layer can be easily removed.
[0013]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the removal of the adhesion layer which adheres to the outer periphery of the liquid level of a molten metal, such as a protective tube, and its vicinity can be performed easily, and the time and cost required for the removal of an adhesion layer are reduced. it can.
Further, the number of protection tubes and the like to be discarded due to the difficulty in removing the adhesion layer can be reduced, and the storage amount of spare parts such as the protection tubes can be reduced.
[Brief description of the drawings]
FIG. 1 is a partial sectional view illustrating a state in which a protective cover according to the present invention is mounted.
FIG. 2 is a cross-sectional view illustrating another example of the protective cover according to the present invention.
FIG. 3 is an explanatory view schematically illustrating an example of a molten metal holding furnace.
FIG. 4 is a partial cross-sectional view illustrating a protective tube having a tip portion immersed in a molten metal held in a molten metal holding furnace.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Molten-metal holding furnace 12 Hot-water pump 14 Hot-water supply drive device 16 Conduit 18 Wall 20 Protective tube 22 Melt 24, 26 Protective covers 26a, 26a Split body

Claims (6)

湯浴内に貯留された金属の溶湯に部分的に浸漬される配管や温度センサの保護管等の溶湯浸漬部材に装着される保護カバーであって、
該保護カバーが、前記溶湯に対して化学的及び物理的に安定している材料によって形成され、且つ前記溶湯浸漬部材の溶湯液面及びその近傍に相当する部分の外周囲に着脱可能に囲繞されていることを特徴とする保護カバー。A protective cover attached to a molten metal immersion member such as a pipe partially immersed in a molten metal stored in a hot water bath or a protective tube of a temperature sensor,
The protective cover is formed of a material that is chemically and physically stable with respect to the molten metal, and is detachably surrounded around the liquid surface of the molten metal immersion member and a portion corresponding to the vicinity thereof. A protective cover characterized by being. 保護カバーが、セラミック製の短繊維を抄紙して得たセラミックペーパーから成る請求項１記載の保護カバー。2. The protective cover according to claim 1, wherein the protective cover is made of ceramic paper obtained by making short fibers made of ceramic. 保護カバーが、セラミック製の筒体が分割された分割体から成る請求項１記載の保護カバー。2. The protective cover according to claim 1, wherein the protective cover comprises a divided body obtained by dividing a ceramic cylinder. 湯浴内に貯留された金属の溶湯に、部分的に浸漬される配管や温度センサの保護管等の溶湯浸漬部材が設けられた溶湯保持炉において、
該溶湯浸漬部材の溶湯液面及びその近傍に相当する部分の外周囲に、前記溶湯に対して化学的及び物理的に安定している材料から成る保護カバーが着脱可能に囲繞されていることを特徴とする溶湯保持炉。In a molten metal holding furnace provided with a molten metal immersion member such as a pipe partially immersed in a molten metal stored in a hot water bath or a protective tube of a temperature sensor,
A protective cover made of a material that is chemically and physically stable with respect to the molten metal is detachably enclosed around the molten metal surface of the molten metal immersion member and a portion corresponding to the vicinity thereof. Melt holding furnace. 保護カバーが、セラミック製の短繊維を抄紙して得たセラミックペーパーから成る請求項４記載の溶湯保持炉。The molten metal holding furnace according to claim 4, wherein the protective cover is made of ceramic paper obtained by making ceramic short fibers. 保護カバーが、セラミック製の筒体が分割された分割体から成る請求項４記載の溶湯保持炉。5. The molten metal holding furnace according to claim 4, wherein the protective cover comprises a divided body obtained by dividing a ceramic cylinder.
JP2003011341A 2003-01-20 2003-01-20 Protective cover, and molten metal retaining furnace Pending JP2004223527A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015107494A (en) * 2013-12-03 2015-06-11 三井金属鉱業株式会社 Metal melting member, metal melting member manufacturing method, and molten metal holding furnace
JP2016104898A (en) * 2014-12-01 2016-06-09 日本坩堝株式会社 Heater tube

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015107494A (en) * 2013-12-03 2015-06-11 三井金属鉱業株式会社 Metal melting member, metal melting member manufacturing method, and molten metal holding furnace
JP2016104898A (en) * 2014-12-01 2016-06-09 日本坩堝株式会社 Heater tube

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