JP2013249498A - Trough end structure of molten pig iron tapping trough, molten pig iron tapping trough with the trough end structure, and construction method of the trough end of molten pig iron tapping trough - Google Patents

Trough end structure of molten pig iron tapping trough, molten pig iron tapping trough with the trough end structure, and construction method of the trough end of molten pig iron tapping trough Download PDF

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JP2013249498A
JP2013249498A JP2012123878A JP2012123878A JP2013249498A JP 2013249498 A JP2013249498 A JP 2013249498A JP 2012123878 A JP2012123878 A JP 2012123878A JP 2012123878 A JP2012123878 A JP 2012123878A JP 2013249498 A JP2013249498 A JP 2013249498A
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refractory layer
trough
refractory
tip
pig iron
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JP6137784B2 (en
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Toru Morimitsu
徹 森光
Kiyoto Nitta
清人 新田
Hideyuki Tazaki
秀之 田崎
Maki Kajiwara
真樹 梶原
Shozo Otsubo
省三 大坪
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Nippon Crucible Co Ltd
Nippon Steel Nisshin Co Ltd
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Nippon Crucible Co Ltd
Nisshin Steel Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide: a trough end structure of a molten pig iron tapping trough capable of effectively preventing generation of cracks in an inside refractory layer of a trough end; a molten pig iron tapping trough provided with the trough end structure; and a construction method of the trough end of the molten pig iron tapping trough.SOLUTION: A structure in an end portion of a molten pig iron tapping trough 1 includes: an inside refractory layer 4 consisting of a monolithic refractory to touch molten iron; and an outside refractory layer 3 provided outside the inside refractory layer 4, wherein a cushion material 5 having flexibility and freely deformable is interposed between the inside refractory layer 4 and the outside refractory layer 3.

Description

本発明は、高炉から出銑した溶銑などの溶融金属を流す出銑樋の樋先構造、この樋先構造を備える出銑樋、および、出銑樋の樋先の施工方法に関するものである。   The present invention relates to an iron tip structure for flowing a molten metal such as hot metal discharged from a blast furnace, an iron wire provided with the iron tip structure, and a method for constructing the iron iron tip.

一般に、高炉には、大樋、溶銑樋、傾注樋、スラグ樋などが設けられており、高炉の出銑口から排出された溶銑は、大樋においてスラグと分離されて流下した後、溶銑樋を通って傾注樋内に一旦溜められて、高炉鍋などの受銑容器に注入される。一方、大樋で分離されたスラグは、スラグ樋に流入し、ドライピットなどに搬出される。大樋、溶銑樋、スラグ樋、傾注樋をまとめて出銑樋と称する。   In general, the blast furnace is provided with large iron, hot metal, tilting iron, slag iron, etc. The hot metal discharged from the outlet of the blast furnace is separated from the slag at the main iron and flows down, and then passes through the hot metal. The water is once stored in the tilting pot and poured into a receiving container such as a blast furnace pan. On the other hand, the slag separated by the large tank flows into the slag tank and is carried out to a dry pit or the like. Oiso, hot metal, slag iron, and tilted iron are collectively called out.

出銑樋の一般的な構造は、図６に示すように、外殻部分が鋼鉄などからなる樋外枠１００で構成され、樋外枠１００の内側に耐火レンガ、キャスタブル、または炭珪質レンガなどからなる外側耐火物層１０１，１０２が内張りされているとともに、さらにその内側に、溶銑やスラグと接触する内側耐火物層１０３が不定形耐火物を流し込み施工することにより設けられている（例えば、特許文献１参照）。   As shown in FIG. 6, the general structure of the tuna is composed of a hull outer frame 100 whose outer shell portion is made of steel or the like, and a refractory brick, a castable or a carbonaceous siliceous brick inside the hail outer frame 100. Outer refractory layers 101 and 102 made of, for example, are lined, and further, an inner refractory layer 103 that comes into contact with hot metal or slag is provided by pouring and applying an amorphous refractory (for example, , See Patent Document 1).

特開２００５−３０７２３０号公報JP 2005-307230 A

上記構造の出銑樋において、施工時に不定形耐火物を流し込み硬化後、これを乾燥させる際、または、施工後の稼動時（出銑時）に高温の溶銑やスラグを収容して流下させる際に、出銑樋は高温に加熱されるが、特に樋の開放端である先端部（樋先）では、この熱の影響を受けて外側（図６において矢印Ｘで示す）に向けて変動する。このとき、樋外枠１００と耐火物とではその熱膨脹係数が異なるために、樋外枠１００が変動してその内側に内張りされた外側耐火物層１０１，１０２とともに外側に開くと、樋外枠１００の変動による引張応力が内側耐火物層１０３に作用する結果、樋先の内側耐火物層１０３に亀裂１０４が発生する。内側耐火物層１０３に亀裂１０４が発生すると、亀裂１０４から溶銑などが漏れ、樋外枠１００を溶損させるおそれがあるために、稼動（出銑）を一旦止めて補修などする必要があるため非常に手間を要するという問題がある。   When pouring an amorphous refractory at the time of construction and drying it after construction, or when containing hot hot metal or slag during operation after construction (at the time of production) In addition, the tuna is heated to a high temperature, but at the tip (tip) which is the open end of the coffin, it varies toward the outside (indicated by an arrow X in FIG. 6) under the influence of this heat. . At this time, since the thermal expansion coefficient differs between the heel outer frame 100 and the refractory, when the heel outer frame 100 fluctuates and opens to the outside together with the outer refractory layers 101 and 102 lined on the inner side, the heel outer frame 100 As a result of the tensile stress due to the fluctuation of 100 acting on the inner refractory layer 103, a crack 104 is generated in the inner refractory layer 103 at the tip. If a crack 104 occurs in the inner refractory layer 103, hot metal or the like leaks from the crack 104, and the iron outer frame 100 may be melted. Therefore, it is necessary to temporarily stop the operation (slagging) and repair it. There is a problem that it is very troublesome.

本発明は、上記した問題に着目してなされたもので、樋先の内側耐火物層の亀裂発生を効果的に防止することができる出銑樋の樋先構造、この樋先構造を備える出銑樋、および、出銑樋の樋先の施工方法を提供することを目的とする。   The present invention has been made by paying attention to the above-described problems, and the tip structure of the tip that can effectively prevent the occurrence of cracks in the inner refractory layer of the tip, and the tip provided with this tip structure. It is an object to provide a method for constructing a fence and the tip of a tap.

本発明の上記目的は、溶融金属と接する不定形耐火物よりなる内側耐火物層と、前記内側耐火物層の外側に設けられた外側耐火物層とを有する出銑樋の先端部における構造であって、前記内側耐火物層と前記外側耐火物層との間には、変形自在な柔軟性を有するクッション材が介在されている出銑樋の樋先構造により達成される。   The above-mentioned object of the present invention is a structure in the tip portion of an output having an inner refractory layer made of an amorphous refractory in contact with a molten metal and an outer refractory layer provided outside the inner refractory layer. In this case, this is achieved by a barbed tip structure in which a cushioning material having deformable flexibility is interposed between the inner refractory layer and the outer refractory layer.

本発明の好ましい実施態様においては、前記クッション材は、断熱性を有するウール材からなることを特徴としている。   In a preferred embodiment of the present invention, the cushion material is made of a wool material having heat insulating properties.

本発明のさらに好ましい実施態様においては、前記ウール材は、セラミックファイバーからなることを特徴としている。   In a further preferred embodiment of the present invention, the wool material is made of a ceramic fiber.

本発明のさらに好ましい実施態様においては、前記クッション材の厚みは、５ｍｍ以上であることを特徴としている。なお、前記クッション材の厚みは、必ずしも５ｍｍ以上である必要はなく、内側耐火物層と外側耐火物層との間に介在していれば、５ｍｍ未満であっても構わない。   In a further preferred embodiment of the present invention, the thickness of the cushion material is 5 mm or more. The thickness of the cushion material is not necessarily 5 mm or more, and may be less than 5 mm as long as it is interposed between the inner refractory layer and the outer refractory layer.

本発明のさらに好ましい実施態様においては、前記クッション材は、前記外側耐火物層の内周面の少なくとも底面を除く側面、すなわち、少なくとも内周面のうちの側面（内周面全面でも可）に設けられていることを特徴としている。   In a further preferred embodiment of the present invention, the cushion material is provided on the side surface excluding at least the bottom surface of the inner peripheral surface of the outer refractory layer, that is, on the side surface of the inner peripheral surface (or the entire inner peripheral surface is acceptable). It is characterized by being provided.

本発明の上記目的は、上記構成の樋先構造を先端部に備える出銑樋によっても達成される。   The above object of the present invention can also be achieved by a tread having a tip structure with a tip structure having the above configuration.

本発明の上記目的は、溶融金属と接する不定形耐火物よりなる内側耐火物層と、前記内側耐火物層の外側に設けられた外側耐火物層とを有する出銑樋の樋先の施工方法であって、前記外側耐火物層の内周面上に、変形自在な柔軟なクッション材が敷設された状態で、型枠との間に不定形耐火物を流し込み、不定形耐火物を硬化・乾燥させる出銑樋の樋先の施工方法によっても達成される。   The above-mentioned object of the present invention is to provide a method for constructing the tip of a tap having an inner refractory layer made of an amorphous refractory in contact with a molten metal, and an outer refractory layer provided outside the inner refractory layer. In the state where a flexible cushioning material that can be deformed is laid on the inner peripheral surface of the outer refractory layer, the amorphous refractory is poured between the mold and the amorphous refractory. It is also achieved by the method of construction of the tip of the tuna to be dried.

本発明によれば、溶銑などの溶融金属を流す出銑樋の樋先における内側耐火物層の亀裂発生を効果的に防止することができる。   ADVANTAGE OF THE INVENTION According to this invention, the crack generation | occurrence | production of the inner side refractory layer can be effectively prevented in the tip of the tap which flows molten metals, such as hot metal.

本発明の一実施形態に係る出銑樋の樋先構造を模式的に示す断面図である。It is sectional drawing which shows typically the tip structure of the taping which concerns on one Embodiment of this invention. 樋先構造の作用を説明する模式的な断面図である。It is typical sectional drawing explaining the effect | action of a tip structure. 樋先構造の作用を説明する模式的な断面図である。It is typical sectional drawing explaining the effect | action of a tip structure. 出銑樋の樋先の施工方法を説明する模式的な断面図である。It is typical sectional drawing explaining the construction method of the tip of a tap. 出銑樋の樋先の施工方法を説明する模式的な断面図である。It is typical sectional drawing explaining the construction method of the tip of a tap. 従来例の出銑樋の樋先構造を模式的に示す断面図である。It is sectional drawing which shows typically the tip structure of the protrusion of a prior art example.

以下、本発明の実態形態について添付図面を参照して説明する。図１は、本発明の一実施形態に係る出銑樋１の先端部（樋先）の内部構造を模式的に示す断面図である。図１に示すように、出銑樋１は、長手方向に延びる鋼鉄よりなる樋外枠２と、樋外枠２の内周面に内張り層として一体に設けられた外側耐火物層３と、外側耐火物層３の内周面に内張り層として一体に設けられた内側耐火物層４とにより構成されている。   Hereinafter, actual forms of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a cross-sectional view schematically showing an internal structure of a tip portion (tip) of a tap 1 according to an embodiment of the present invention. As shown in FIG. 1, the output 1 includes a heel outer frame 2 made of steel extending in the longitudinal direction, an outer refractory layer 3 integrally provided as an lining layer on the inner peripheral surface of the heel outer frame 2, and The inner refractory layer 4 is integrally provided on the inner peripheral surface of the outer refractory layer 3 as a lining layer.

外側耐火物層３は、溶銑などの溶融金属およびスラグと直接接触するためのものではなく、溶融金属の漏洩を防止するためのものであり、補修の際には再利用される。本実施形態では、外側耐火物層３は、耐火レンガまたはキャスタブルよりなる断熱用耐火材３ａと、アルミナ、炭珪質レンガまたはキャスタブルよりなるパーマ用耐火材３ｂとの二層構造になっている。   The outer refractory layer 3 is not for direct contact with molten metal such as hot metal and slag, but for preventing leakage of the molten metal, and is reused for repair. In the present embodiment, the outer refractory layer 3 has a two-layer structure of a heat-insulating refractory material 3a made of refractory brick or castable and a permanent refractory material 3b made of alumina, carbonaceous brick or castable.

内側耐火物層４は、溶銑やスラグと直に接触するものであり、内側耐火物層４の幅中央部には、溶銑やスラグを収容して、出銑樋１の長手方向へ流下させる流路４０が形成されている。この内側耐火物層４は、不定形耐火物の流し込みおよび硬化により形成されている。内側耐火物層４を形成する不定形耐火物としては、内側耐火物層４が高温に曝され、しかも溶銑やスラグによる損傷を受けやすいため、耐熱性・耐食性に優れた材質であることが好ましく、アルミナ−炭化珪素−カーボン材質の不定形耐火物を好ましく例示することができるが、何もアルミナ−炭化珪素−カーボン材質の不定形耐火物のみに限られるものではない。この内側耐火物層４は、損傷が大きくなると、一般に、損傷している古い内側耐火物層４を解体して除去した後、再び、不定形耐火物を流し込んでこれを硬化させることにより、補修される。   The inner refractory layer 4 is in direct contact with the hot metal or slag, and the inner refractory layer 4 accommodates hot metal or slag in the center of the width and flows down in the longitudinal direction of the hot metal 1. A path 40 is formed. This inner refractory layer 4 is formed by pouring and curing an amorphous refractory. The amorphous refractory forming the inner refractory layer 4 is preferably a material having excellent heat resistance and corrosion resistance because the inner refractory layer 4 is exposed to high temperatures and is easily damaged by hot metal or slag. An amorphous refractory made of an alumina-silicon carbide-carbon material can be preferably exemplified, but nothing is limited to an amorphous refractory made of an alumina-silicon carbide-carbon material. When this inner refractory layer 4 becomes damaged, it is generally repaired by dismantling and removing the damaged old inner refractory layer 4 and then pouring the amorphous refractory again to cure it. Is done.

本実施形態の出銑樋１は、その先端部側の樋先の構造に特徴を有しており、外側耐火物層３の内周面と内側耐火物層４の外周面との間に、仕切り材として、柔軟性を有する変形自在なクッション材５を介在させることで、外側耐火物層３と内側耐火物層４とを縁切りしている。   The output 1 of this embodiment is characterized by the structure of the tip of the tip side, and between the inner peripheral surface of the outer refractory layer 3 and the outer peripheral surface of the inner refractory layer 4, The outer refractory layer 3 and the inner refractory layer 4 are separated by interposing a flexible cushion material 5 having flexibility as a partition material.

このように、不定形耐火物からなる内側耐火物層４とその外側の外側耐火物層３との間に、仕切り材として変形自在な柔軟性を有するクッション材５を設けて、外側耐火物層３と内側耐火物層４とを縁切りしているため、施工時に不定形耐火物を流し込んだ後、これを硬化させて乾燥させる際、または、施工後の稼動時（出銑時）に高温の溶銑やスラグを収容して流下させる際に、出銑樋１が高温に加熱されることで、樋先の樋外枠２が変動し、その内周面に内張りした外側耐火物層３とともに、図２の矢印Ｙに示すように、外側に開いたとしても、クッション材５が介在し縁切りしているため、内側耐火物層４には樋外枠２の変動による引張応力が及ばない。一方で、出銑樋１が冷却されて、図３の矢印Ｚに示すように、樋先の出銑樋１が内側に変動しても、クッション材５が圧縮変形するだけで、内側耐火物層４には樋外枠２の変動による圧縮応力も及ばない。従って、本実施形態の出銑樋１の樋先構造によれば、樋外枠２の変動により内側耐火物層４に作用する引張応力および圧縮応力を、クッション材５を介在させることによって、縁切りかつ仕切り材のクッション性により緩和しているので、内側耐火物層４に亀裂が発生するのを効果的に防止することができ、その結果、出銑樋１の寿命を延長可能となっている。   As described above, the outer refractory layer is provided by providing the cushioning material 5 having flexibility as a partitioning material between the inner refractory layer 4 made of the irregular refractory and the outer refractory layer 3 outside thereof. 3 and the inner refractory layer 4 are separated from each other. After pouring an amorphous refractory during construction, when it is hardened and dried, or during operation after construction (during brewing) When the hot metal and slag are accommodated and flowed down, the hot metal 1 is heated to a high temperature, so that the hot metal outer frame 2 of the iron tip fluctuates, together with the outer refractory layer 3 lined on the inner peripheral surface thereof, As shown by an arrow Y in FIG. 2, even if the outer side is opened, the cushion material 5 is interposed and cut off, so that the inner refractory layer 4 is not subjected to tensile stress due to the fluctuation of the outer frame 2. On the other hand, as shown in the arrow Z in FIG. 3, even when the tread 1 is cooled, the cushion material 5 is only compressed and deformed even if the tread 1 at the tip fluctuates inward. The layer 4 is not subjected to compressive stress due to the fluctuation of the outer frame 2. Therefore, according to the tip structure of the output 1 of the present embodiment, the tensile stress and the compressive stress acting on the inner refractory layer 4 due to the fluctuation of the outer frame 2 can be applied by interposing the cushion material 5. In addition, since the cushioning property of the partition material is alleviated, it is possible to effectively prevent the inner refractory layer 4 from cracking, and as a result, the life of the output 1 can be extended. .

クッション材５としては、耐熱性を有する繊維からなる繊維束、前記繊維を綿状にしたウール材、前記繊維を布状に加工した不織布または織布などを例示することができるが、その中でも、柔軟性の点からウール材を用いるのが好ましい。なお、柔軟性を有し、変形可能なものであれば、何もこれらのものに限られるものではない。   Examples of the cushion material 5 include a fiber bundle made of heat-resistant fibers, a wool material in which the fibers are made into a cotton shape, and a nonwoven fabric or a woven fabric in which the fibers are processed into a cloth shape. It is preferable to use a wool material from the viewpoint of flexibility. In addition, as long as it has flexibility and can be deformed, nothing is limited thereto.

ウール材としては、ガラスウール、ロックウール、セラミックファイバーを綿状にしたもの、または、金属繊維を綿状にしたものなどを例示することができるが、その中でも、セラミックファイバーからなるウール材は、断熱性、耐熱性に優れている点で好ましい。   Examples of the wool material include glass wool, rock wool, ceramic fiber in a cotton form, or metal fiber in a cotton form. Among them, a wool material made of ceramic fibers is It is preferable at the point which is excellent in heat insulation and heat resistance.

また、クッション材５は、その厚みが５ｍｍ以上であることが好ましい。クッション材５の厚みが薄すぎると、クッション性が乏しく、クッション材５が樋外枠２の変動に追随して変形できる変形可能量が小さくなる。外側耐火物層３の内周面は、一般的に、凸凹を有し、ざらざらしていて滑らかではないため、クッション材５の効力が低いと、内側耐火物層４が外側耐火物層３に引っ掛かって外側耐火物層３とともに外側に開くおそれがある。また、樋外枠２がクッション材５の変形可能量以上に内側に変動した場合も同様である。そうすると、クッション材５を介して、樋外枠２の変動による引張応力や圧縮応力が内側耐火物層４に作用する結果、内側耐火物層４に亀裂が発生するおそれがある。以上の理由により、クッション材５は、十分にクッション性を有することが好ましく、その厚みが５ｍｍ以上であることが好ましい。ただし、クッション材の厚みは、必ずしも５ｍｍ以上である必要はなく、５ｍｍ未満であっても構わない。   Moreover, it is preferable that the thickness of the cushion material 5 is 5 mm or more. If the thickness of the cushion material 5 is too thin, the cushioning property is poor, and the deformable amount that the cushion material 5 can be deformed following the variation of the heel outer frame 2 becomes small. Since the inner peripheral surface of the outer refractory layer 3 generally has irregularities and is rough and not smooth, the inner refractory layer 4 becomes the outer refractory layer 3 when the effectiveness of the cushion material 5 is low. There is a risk of being caught and opening outward together with the outer refractory layer 3. The same applies to the case where the heel outer frame 2 fluctuates inward more than the deformable amount of the cushion material 5. If it does so, there exists a possibility that a crack may generate | occur | produce in the inner side refractory layer 4 as a result of the tensile stress and the compressive stress by the fluctuation | variation of the collar outer frame 2 acting on the inner side refractory layer 4 via the cushion material 5. For the above reasons, the cushion material 5 preferably has sufficient cushioning properties, and the thickness thereof is preferably 5 mm or more. However, the thickness of the cushion material does not necessarily need to be 5 mm or more, and may be less than 5 mm.

なお、クッション材５を外側耐火物層３および内側耐火物層４の間に介在させる範囲としては、出銑樋１の先端部から３００ｍｍ以上であることが好ましく、５００ｍｍ以上１０００ｍｍ以内であることがより好ましい。   In addition, as a range which interposes the cushioning material 5 between the outer side refractory layer 3 and the inner side refractory layer 4, it is preferable that it is 300 mm or more from the front-end | tip part of the output 1, and it is 500 mm or more and 1000 mm or less. More preferred.

次に、上記した樋先構造を備える出銑樋１の樋先の施工方法を、図４を用いて説明する。まず、略Ｕ字状の樋外枠１の内周面に、耐火レンガなどの耐火物を内張りして外側耐火物層３を施工する（図４（１））。そして、出銑樋１の先端部から所定の範囲にわたって、外側耐火物層３の内周面上に、その全面（本実施形態では、側面３１および底面３０）を覆うようにクッション材５を敷設する（図４（２））。そして、外側耐火物層３の内側に型枠Ｃをセットし（図４（３））、この型枠Ｃと外側耐火物層３との間に、クッション材５を敷設した状態で、不定形耐火物Ｄを流し込む（図４（４））。この不定形耐火物Ｄが硬化後、型枠Ｃを脱枠し、バーナなどの加熱手段を用いて不定形耐火物Ｄを乾燥させる。これにより、上記した樋先構造を備える出銑樋１が形成される。   Next, a method for constructing the tip of the tap 1 having the above-described tip structure will be described with reference to FIG. First, the outer refractory layer 3 is constructed by lining a refractory such as a refractory brick on the inner peripheral surface of the substantially U-shaped outer frame 1 (FIG. 4 (1)). Then, the cushion material 5 is laid on the inner peripheral surface of the outer refractory layer 3 over a predetermined range from the tip of the barb 1 so as to cover the entire surface (the side surface 31 and the bottom surface 30 in this embodiment). (FIG. 4 (2)). Then, the mold C is set inside the outer refractory layer 3 (FIG. 4 (3)), and the cushion material 5 is laid between the mold C and the outer refractory layer 3, so that it is indefinite. The refractory D is poured (FIG. 4 (4)). After the amorphous refractory D is cured, the mold C is removed and the amorphous refractory D is dried using a heating means such as a burner. Thereby, the output 1 provided with the above-mentioned tip structure is formed.

また、長期間の稼動により、溶銑などと接触する内側耐火物層４の損傷が激しいと、一旦稼動を止めて補修する必要があるが、この場合には、損傷している古い内側耐火物層４を解体してそのほとんど全てを除去した後（図４（０），（１´））、上記した図４（２）と同様に、出銑樋１の先端部から所定の範囲にわたって、再び、外側耐火物層３の内周面上に、その全面を覆うようにクッション材５を敷設する。そして、外側耐火物層３の内側に型枠Ｃをセットし、この型枠Ｃと外側耐火物層３との間に、クッション材５を敷設した状態で、不定形耐火物Ｄを流し込む。この不定形耐火物Ｄが硬化した状態で型枠Ｃを脱枠し、バーナなどの加熱手段を用いて不定形耐火物Ｄを乾燥させる。これにより、上記した樋先構造を備える出銑樋１が復元補修される。   Also, if the inner refractory layer 4 in contact with the hot metal is severely damaged due to long-term operation, it is necessary to stop the operation and repair it. In this case, the damaged old refractory layer 4 is disassembled and almost all of them are removed (FIGS. 4 (0) and (1 ')), and then again over the predetermined range from the tip of the output 1 as in FIG. 4 (2). The cushion material 5 is laid on the inner peripheral surface of the outer refractory layer 3 so as to cover the entire surface thereof. Then, the mold C is set inside the outer refractory layer 3, and the amorphous refractory D is poured in a state where the cushion material 5 is laid between the mold C and the outer refractory layer 3. In a state where the amorphous refractory D is cured, the mold C is removed, and the amorphous refractory D is dried using heating means such as a burner. Thereby, the output 1 provided with the above-mentioned tip structure is restored and repaired.

また、補修の際には、図５に示すように、損傷している古い内側耐火物層４の一部を解体し（図５（０），（１））、古い内側耐火物層４の内周面上に、出銑樋１の先端部から所定の範囲にわたって、再び、その全面を覆うようにクッション材５を敷設するようにしても構わない。そして、古い内側耐火物層４の内側に型枠Ｃをセットし、この型枠Ｃと古い内側耐火物層４との間に、クッション材５を敷設した状態で、不定形耐火物Ｄを流し込む。この不定形耐火物Ｄが硬化した状態で型枠Ｃを脱枠し、バーナなどの加熱手段を用いて不定形耐火物Ｄを乾燥させる。これにより、出銑樋１を復元補修してもよい。   When repairing, as shown in FIG. 5, a part of the damaged old inner refractory layer 4 is disassembled (FIG. 5 (0), (1)), and the old inner refractory layer 4 is removed. On the inner peripheral surface, the cushion material 5 may be laid again so as to cover the entire surface again over a predetermined range from the front end portion of the tap bar 1. Then, the mold C is set inside the old inner refractory layer 4, and the amorphous refractory D is poured in a state where the cushion material 5 is laid between the mold C and the old inner refractory layer 4. . In a state where the amorphous refractory D is cured, the mold C is removed, and the amorphous refractory D is dried using heating means such as a burner. Thereby, you may restore and repair the output 1.

本実施形態の出銑樋１の樋先構造の作用・効果を確認するため、上記構成の出銑樋１において、仕切り材となるクッション材５として、セラミックファイバーからなるウール材（以下、「セラミックウール材」という。）を採用したものを実施例１，２とした。実施例１では、セラミックウール材の厚みを１０ｍｍとし、実施例２では、セラミックウール材の厚みを５ｍｍとした。また、仕切り材を外側耐火物層３と内側耐火物層４との間に介在させない態様のものを従来例とした。さらに、仕切り材として、０．３ｍｍ厚のビニールシートを採用したものを比較例とした。なお、内側耐火物層４の不定形耐火物としては、アルミナ−炭化珪素−カーボン材質の不定形耐火物を使用した。そして、これらの実施例１，２、従来例および比較例の出銑樋１の流路４０に対して、それぞれ溶銑を所定量供給した後、流路４０から残銑を抜き、出銑樋１の樋先において、内側耐火物層４に亀裂が発生しているかを実測した。これを１０回繰り返して行うことで、亀裂の発生頻度を評価した。評価結果を、以下の表１に示す。   In order to confirm the operation and effect of the tip structure of the output 1 of the present embodiment, in the output 1 having the above-described structure, a wool material made of ceramic fibers (hereinafter referred to as “ceramic”) is used as the cushion material 5 serving as a partition material. Examples employing the “wool material”) were designated as Examples 1 and 2. In Example 1, the thickness of the ceramic wool material was 10 mm, and in Example 2, the thickness of the ceramic wool material was 5 mm. Moreover, the thing of the aspect which does not interpose a partition material between the outer side refractory layer 3 and the inner side refractory layer 4 was made into the prior art example. Furthermore, what used the 0.3-mm-thick vinyl sheet as a partition material was made into the comparative example. In addition, as the amorphous refractory for the inner refractory layer 4, an amorphous refractory made of alumina-silicon carbide-carbon material was used. Then, after supplying a predetermined amount of hot metal to the flow path 40 of the output 1 of each of Examples 1 and 2, the conventional example, and the comparative example, the residue is removed from the flow path 40, and the output 1 It was actually measured whether a crack occurred in the inner refractory layer 4 at the tip of the iron. By repeating this 10 times, the occurrence frequency of cracks was evaluated. The evaluation results are shown in Table 1 below.

Figure 2013249498
Figure 2013249498

表１に示すように、厚さが５ｍｍ以上のセラミックウール材（クッション材５）を仕切り材として、外側耐火物層３と内側耐火物層４との間に介在させることにより、内側耐火物層４に亀裂が発生することを大幅に抑制可能であることが確認された。また、厚さが０．３ｍｍのビニールシートを仕切り材として、外側耐火物層３と内側耐火物層４との間に介在させることで、外側耐火物層３と内側耐火物層４とが縁切りされるため、内側耐火物層４の亀裂の発生を多少は低減できるが、亀裂の発生を完全には抑制できないことが確認された。これは、厚さが０．３ｍｍのビニールシートでは、クッション性に乏しく、樋外枠２の変動により内側耐火物層４に作用する応力を、完全には緩和できないからであると思われる。   As shown in Table 1, the inner refractory layer is formed by interposing between the outer refractory layer 3 and the inner refractory layer 4 using a ceramic wool material (cushion material 5) having a thickness of 5 mm or more as a partition material. It was confirmed that generation of cracks in 4 can be greatly suppressed. Moreover, the outer refractory layer 3 and the inner refractory layer 4 are separated by interposing between the outer refractory layer 3 and the inner refractory layer 4 using a vinyl sheet having a thickness of 0.3 mm as a partitioning material. Therefore, it was confirmed that although the occurrence of cracks in the inner refractory layer 4 can be somewhat reduced, the occurrence of cracks cannot be completely suppressed. This is presumably because the vinyl sheet having a thickness of 0.3 mm has poor cushioning properties, and the stress acting on the inner refractory layer 4 due to the fluctuation of the outer frame 2 cannot be completely relieved.

以上のように、本実施形態の出銑樋１の樋先構造によれば、加熱と冷却が断続的に繰り返されることにより亀裂が発生しやすい樋先において、変形自在な柔軟性を有するクッション材５を仕切り材として介在させることにより、外側耐火物層３と内側耐火物層４とを縁切りし、かつ、仕切り材にクッション性を持たせるようにしたので、樋外枠２の変動に伴う応力が内側耐火物層４に作用するのが緩和され、その結果、内側耐火物層４に亀裂が発生するのを効果的に防止することが可能である。   As described above, according to the tip structure of the output 1 of the present embodiment, the cushioning material having a deformable flexibility at the tip where cracking is likely to occur by intermittently repeating heating and cooling. Since the outer refractory layer 3 and the inner refractory layer 4 are bordered by interposing 5 as a partitioning material, and the partitioning material is provided with cushioning properties, the stress associated with the fluctuation of the outer frame 2 Is mitigated from acting on the inner refractory layer 4, and as a result, it is possible to effectively prevent the inner refractory layer 4 from cracking.

以上、本発明の実施形態について説明したが、本発明はこれらに限定されるものではなく、本発明の趣旨を逸脱しない限りにおいて種々の変更が可能である。例えば、本実施形態では、外側耐火物層３の内周面の全面（側面３１および底面３０）を覆うようにクッション材５を設けているが、必ずしも底面３０には設ける必要がなく、少なくとも側面３１だけに設けるようにしてもよい。   As mentioned above, although embodiment of this invention was described, this invention is not limited to these, A various change is possible unless it deviates from the meaning of this invention. For example, in the present embodiment, the cushion material 5 is provided so as to cover the entire inner peripheral surface (the side surface 31 and the bottom surface 30) of the outer refractory layer 3; You may make it provide only 31.

また、出銑樋１として、大樋、溶銑樋、スラグ樋および傾注樋に、本実施形態の樋先構造を適用することができる。傾注樋では、その両端部に樋先構造を適用することができる。   In addition, the tip structure of the present embodiment can be applied to the large iron, hot metal, slag iron, and tilted iron as the output 1. In the tilting rod, the tip structure can be applied to both ends thereof.

１ 出銑樋
３ 外側耐火物層
４ 内側耐火物層
５ クッション材 1 Outer 3 Outer refractory layer 4 Inner refractory layer 5 Cushion material

Claims (7)

溶融金属と接する不定形耐火物よりなる内側耐火物層と、前記内側耐火物層の外側に設けられた外側耐火物層とを有する出銑樋の先端部における構造であって、
前記内側耐火物層と前記外側耐火物層との間には、変形自在な柔軟性を有するクッション材が介在されている出銑樋の樋先構造。 A structure at the tip of the output having an inner refractory layer made of an amorphous refractory in contact with the molten metal, and an outer refractory layer provided outside the inner refractory layer,
A spear tip structure in which a cushioning material having deformable flexibility is interposed between the inner refractory layer and the outer refractory layer. 前記クッション材は、断熱性を有するウール材からなる請求項１に記載の出銑樋の樋先構造。   2. The heel tip structure according to claim 1, wherein the cushion material is made of a wool material having heat insulation properties. 前記ウール材は、セラミックファイバーからなる請求項２に記載の出銑樋の樋先構造。   The head-tip structure according to claim 2, wherein the wool material is made of ceramic fiber. 前記クッション材の厚みは、５ｍｍ以上である請求項１から３のいずれかに記載の出銑樋の樋先構造。   4. The tipping tip structure according to claim 1, wherein the cushion material has a thickness of 5 mm or more. 前記クッション材は、前記外側耐火物層の内周面の少なくとも底面を除く側面に設けられている請求項１から４のいずれかに記載の出銑樋の樋先構造。   5. The tipping tip structure according to claim 1, wherein the cushion material is provided on a side surface excluding at least a bottom surface of an inner peripheral surface of the outer refractory layer. 請求項１から５のいずれかに記載の樋先構造を先端部に備える出銑樋。   A tread comprising the tip structure according to any one of claims 1 to 5 at a tip portion. 溶融金属と接する不定形耐火物よりなる内側耐火物層と、前記内側耐火物層の外側に設けられた外側耐火物層とを有する出銑樋の樋先の施工方法であって、
前記外側耐火物層の内周面上に、変形自在な柔軟なクッション材が敷設された状態で、型枠との間に不定形耐火物を流し込み、不定形耐火物を硬化・乾燥させる出銑樋の樋先の施工方法。 An inner refractory layer made of an amorphous refractory in contact with a molten metal, and an outer refractory layer provided outside the inner refractory layer,
An uncured refractory is poured between the outer frame of the outer refractory layer and a deformable flexible cushion material, and the amorphous refractory is cured and dried. The construction method of the tip of the fence.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61175895U (en) * 1985-04-22 1986-11-01
JPH0331408A (en) * 1989-06-21 1991-02-12 Hoogovens Groep Bv Groove-type structure for running molten pig iron
JP2001021271A (en) * 1999-07-06 2001-01-26 Ookurashiyou Zouheikiyokuchiyou Trough for molten metal
JP2002332512A (en) * 2001-05-09 2002-11-22 Tokyo Yogyo Co Ltd Trough for molten metal and slag
JP2008240000A (en) * 2007-03-23 2008-10-09 Sumitomo Metal Ind Ltd Trough structure coping with thermal-expansion of trough refractory, and trough peripheral structure

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61175895U (en) * 1985-04-22 1986-11-01
JPH0331408A (en) * 1989-06-21 1991-02-12 Hoogovens Groep Bv Groove-type structure for running molten pig iron
JP2001021271A (en) * 1999-07-06 2001-01-26 Ookurashiyou Zouheikiyokuchiyou Trough for molten metal
JP2002332512A (en) * 2001-05-09 2002-11-22 Tokyo Yogyo Co Ltd Trough for molten metal and slag
JP2008240000A (en) * 2007-03-23 2008-10-09 Sumitomo Metal Ind Ltd Trough structure coping with thermal-expansion of trough refractory, and trough peripheral structure

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