JP3139674B2 - Fire resistant structure around the stopper nozzle of the bottom pouring ladle - Google Patents

Fire resistant structure around the stopper nozzle of the bottom pouring ladle

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Publication number
JP3139674B2
JP3139674B2 JP10071477A JP7147798A JP3139674B2 JP 3139674 B2 JP3139674 B2 JP 3139674B2 JP 10071477 A JP10071477 A JP 10071477A JP 7147798 A JP7147798 A JP 7147798A JP 3139674 B2 JP3139674 B2 JP 3139674B2
Authority
JP
Japan
Prior art keywords
nozzle
ladle
stopper
brick
outer peripheral
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
Application number
JP10071477A
Other languages
Japanese (ja)
Other versions
JPH11245017A (en
Inventor
正典 小林
敬 米田
栄次 上辻
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kurimoto Ltd
Original Assignee
Kurimoto Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kurimoto Ltd filed Critical Kurimoto Ltd
Priority to JP10071477A priority Critical patent/JP3139674B2/en
Publication of JPH11245017A publication Critical patent/JPH11245017A/en
Application granted granted Critical
Publication of JP3139674B2 publication Critical patent/JP3139674B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Continuous Casting (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は鋳鋼、製鋼工場にお
ける鋳造時に使用する底注ぎ取鍋のストッパーノズル周
辺の構造に係る。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure around a stopper nozzle of a bottom pouring ladle used at the time of casting in a cast steel and steelmaking plant.

【0002】[0002]

【従来の技術】図3は底注ぎ取鍋の全体を示す正面図
(A)と側面図(B)であり、鉄板を曲げ加工と溶接成
形によって製作した取鍋本体2にストッパー装置10を
取り付け、ストッパーノズルを閉止状態にして溶解炉か
ら受湯し、鋳型上へ取鍋を搬送してストッパーノズルを
開放して内部の溶湯を鋳造する。この場合、溶湯と一緒
に炉から排出され取鍋内で溶湯上面に分離浮上している
溶滓が鋳造時に溶湯中へ混入しないように、鋳型は底注
ぎ方式として取鍋底部から溶湯を注湯する形態とするこ
とが通常である。
2. Description of the Related Art FIG. 3 is a front view (A) and a side view (B) showing an entire bottom pouring ladle. A stopper device 10 is attached to a ladle main body 2 manufactured by bending and welding an iron plate. Then, the stopper nozzle is closed, the molten metal is received from the melting furnace, the ladle is transported onto the mold, and the stopper nozzle is opened to cast the molten metal inside. In this case, the mold is poured from the bottom of the ladle as a bottom pouring method so that the molten slag discharged from the furnace together with the molten metal and separated and floated on the upper surface of the molten metal in the ladle is not mixed into the molten metal during casting. Usually, it is in a form to be performed.

【0003】溶湯の適当な鋳造温度は鉄系の場合、14
50〜1500℃が一般であるから、取鍋内面はこの高
熱に耐え得る耐火構造とすることは言うまでもない。具
体的には図3のように鋳造のために開閉する底面に上方
から昇降自在に吊支されるストッパーヘッド7が着脱自
在に当接するストッパーノズル101を取鍋底部に埋め
込み、通常は両者が密着して溶湯の流出を遮断するが、
ストッパーヘッド7が引き上げられてストッパーノズル
101との間に隙間が生じると、その隙間を通過して溶
湯が流出して鋳造される。このストッパーノズル101
を埋設した周辺の耐火構造を断面で示すと、図4のよう
に鉄板製の取鍋本体2の底面21の上へ底敷きレンガ3
を敷き並べ、ストッパーノズル101を内嵌する位置に
セットしたノズル受けレンガ104を固定し、該ノズル
受けレンガ104の中に嵌合したストッパーノズル10
1のノズル孔を取鍋本体の底面21を貫通して穿孔した
注湯口22と一致させる。この状態で耐火層3より上方
へ突出したノズル受けレンガ104の外周面が埋没する
厚さまで、底敷きレンガ3上へ不定形耐火物(たとえば
アルミナ粉体と粘結材)を搗き固めて耐火層106を形
成して取鍋本体2の側壁5に至る底面を造成し、溶湯の
高熱に耐え得る耐火内張り構造を形成するのである。
[0003] A suitable casting temperature of the molten metal is 14
Since the temperature is generally 50 to 1500 ° C., it is needless to say that the inner surface of the ladle has a refractory structure that can withstand this high heat. Specifically, as shown in FIG. 3, a stopper nozzle 101, which is detachably contacted with a stopper head 7, which is suspended from the upper side so that it can be lifted and lowered from above, is embedded into the bottom of the ladle. To block outflow of molten metal,
When a gap is formed between the stopper head 7 and the stopper nozzle 101 by lifting the stopper head 7, the molten metal flows out through the gap to be cast. This stopper nozzle 101
The cross section of the surrounding fire-resistant structure in which is embedded is shown in FIG. 4.
The nozzle receiving brick 104 set at a position where the stopper nozzle 101 is fitted inside is fixed, and the stopper nozzle 10 fitted in the nozzle receiving brick 104 is fixed.
One nozzle hole is made to coincide with the pouring hole 22 that has been drilled through the bottom surface 21 of the ladle body. In this state, irregular-shaped refractories (for example, alumina powder and a binder) are ground on the bottom brick 3 until the outer peripheral surface of the nozzle receiving brick 104 protruding above the refractory layer 3 is buried. 106 is formed to form a bottom surface extending to the side wall 5 of the ladle main body 2, thereby forming a refractory lining structure capable of withstanding the high heat of the molten metal.

【0004】[0004]

【発明が解決しようとする課題】図5は図4の従来技術
におけるストッパーノズル周辺の耐火構造だけを拡大し
て示した要部の断面図であり、図6と図7は図5の従来
技術において使用する一般的なノズル受けレンガ104
の2形態についての平面図(A)と正面図(B)を示し
たものである。図5のように取鍋本体2の平面21に注
湯口22を穿孔し、この注湯口22に連通するノズル孔
112を中央に貫通したストッパーノズル101を位置
決めし、ストッパーノズル101の外周の円錐面111
の傾斜とほぼ一致する逆勾配よりなる嵌合孔141を中
央に具えたノズル受けレンガ104がストッパーノズル
101を囲んで嵌合する。ノズル受けレンガ104は図
6、図7のように一般に角形または一辺が円弧面を含む
角形で製作するのが慣用化されており、この形態でノズ
ル受けレンガ104の外周面143を不定形耐火物で搗
き固めて耐火層106を形成する。しかしこの構造にお
いては、従来から種々の課題を誘発する要因が内在して
いるため耐火構造の欠陥による鋳造時のトラブルも発生
し、職場の安全上、あるいは鋳造品の品質上、もしくは
作業能率上、数々の憂慮すべき事態を呼び起こす懸念が
指摘されてきた。
FIG. 5 is a cross-sectional view of a main portion of the prior art shown in FIG. 4 in which only the fireproof structure around the stopper nozzle is enlarged. FIGS. 6 and 7 are sectional views of the prior art shown in FIG. Nozzle receiving brick 104 used in
2A and 2B are a plan view and a front view, respectively. As shown in FIG. 5, a pouring port 22 is pierced in a flat surface 21 of the ladle main body 2, a stopper nozzle 101 penetrating a nozzle hole 112 communicating with the pouring port 22 at the center is positioned, and a conical surface on an outer periphery of the stopper nozzle 101 is provided. 111
A nozzle receiving brick 104 having a fitting hole 141 formed at the center and having a reverse slope substantially corresponding to the inclination of the stopper nozzle 101 is fitted around the stopper nozzle 101. As shown in FIGS. 6 and 7, it is customary to generally manufacture the nozzle receiving brick 104 in a square shape or a square shape having one side including an arc surface. In this form, the outer peripheral surface 143 of the nozzle receiving brick 104 is made of an irregular refractory. To form the refractory layer 106. However, in this structure, there are inherent factors that induce various problems, and troubles during casting due to defects in the refractory structure also occur, resulting in workplace safety, cast product quality, and work efficiency problems. Concerns have been raised that have triggered a number of alarming situations.

【0005】溶解炉から1500℃近い高熱の溶湯を受
湯して鋳型直上まで搬送し、位置を合わせて注湯する。
1回の出湯で注湯できる鋳型の個数は一定でないが、受
湯した取鍋のストッパーノズルとストッパーヘッドとは
1回限りで取り替え、注湯時以外は両者が常に密着して
その間隙から溶湯が漏れ出して鋳型以外の場所へ流出し
ないようにすり合わせている。しかしこのストッパーノ
ズルを周囲から内嵌して支えるノズル受けレンガ104
は、取鍋の底面を形成する耐火層106と同様に受湯の
都度更新するのではなく、できるだけ損耗しないで耐火
の機能を維持して多数回繰り返し使用することが強く求
められる要件である。したがって取鍋内部の溶湯と直接
接する部分、特にストッパーノズル周辺のの耐用回数が
生産性や経済性、ひいては製造コストに及ぼす影響が極
めて大きいことは論を俟たない。
[0005] A high-temperature molten metal of about 1500 ° C is received from a melting furnace, conveyed to a position immediately above a mold, and is positioned and poured.
The number of molds that can be poured in one tap is not fixed, but the stopper nozzle and stopper head of the ladle that received the hot water are replaced only once. Are rubbed so as not to leak out and flow out of the mold. However, the nozzle receiving brick 104 which supports the stopper nozzle by fitting it from the periphery.
Is a requirement that, like the refractory layer 106 forming the bottom surface of the ladle, is not renewed every time the hot water is received, but is repeatedly used many times while maintaining the refractory function with as little wear as possible. Therefore, it cannot be overemphasized that the number of times of use in the portion directly in contact with the molten metal inside the ladle, particularly in the vicinity of the stopper nozzle, has a very large effect on productivity, economy, and production cost.

【0006】しかしながら、ノズル受けレンガ104や
耐火層106が高熱の溶湯を受ける度に強熱されて膨張
し、注湯終了と共に冷却を繰り返す苛酷な熱サイクルに
曝されることは逃れられないから、如何に材料自体が信
頼性の高い耐火性を具えているとしても、物理的に到底
耐え難い限界がある。ノズル受けレンガ自体だけに着目
しても、図6に記入したように溶湯の通過する嵌合孔1
41から外周面143に至る最短距離P1:P2では1:
1.7の差があり、嵌合孔141の傾斜に伴う上下方向
の肉厚差p1:p2も1:1.3に達する。一方、図7に
ついても図示したようにQ1:Q2の差が1:1.6と大
きく、上下面方向についてもq1:q2は1:1.25に
及び、この差は直接、部材が加熱されたときの熱膨張量
に比例するから、従来技術のノズル受けレンガでは受湯
毎に熱膨張量の差に比例した熱衝撃に襲われて生じた内
部応力がレンガを形成する機械的強度を超え、この破壊
力が材料の亀裂に繋がることは理の当然であると解釈さ
れる。
However, the nozzle receiving brick 104 and the refractory layer 106 are ignited and expanded each time they receive a high-temperature molten metal, and cannot be escaped from being subjected to a severe thermal cycle in which cooling is repeated with completion of pouring. No matter how much the material itself has a highly reliable fire resistance, there is a limit which is physically hard to withstand. Even if attention is paid only to the nozzle receiving brick itself, as shown in FIG.
In the shortest distance P1: P2 from 41 to the outer peripheral surface 143, 1:
There is a difference of 1.7, and the thickness difference p1: p2 in the vertical direction due to the inclination of the fitting hole 141 also reaches 1: 1.3. On the other hand, as shown in FIG. 7, the difference between Q1 and Q2 is as large as 1: 1.6, and the ratio of q1 and q2 is also as large as 1: 1.25 in the vertical direction. Because it is proportional to the amount of thermal expansion at the time, in the prior art nozzle receiving brick, the internal stress generated by the thermal shock proportional to the difference in the amount of thermal expansion for each hot water exceeds the mechanical strength to form the brick It is understood that this destructive force leads to cracks in the material.

【0007】形状によるマイナス面は、ノズル受けレン
ガ外周の耐火層の強度にも大きな影響を与える。耐火層
106は角形の外周面143と接してその位置によって
異なる熱応力を繰り返し受けるから、とくに角形のコー
ナー部分はエッジ作用となって応力が集中し、この部分
に亀裂が発生すると急速に伸張することは避け難い。ま
た不定形耐火物を搗き固めて耐火層を成形するときに
も、角形のコーナー部に添った周辺は締め固め難く、成
形後の強度自体が低くならざるを得ないから、急速な加
熱と冷却を繰り返す熱サイクルを受けると、亀裂や隙間
の発生する傾向が一段と昂進する。一旦、隙間が生じる
と、取鍋に受湯した後、この隙間を縫って溶湯が潜り込
みストレートに取鍋本体の底面にまで達する懸念が極め
て濃厚であり、取鍋からの湯漏れ事故の大半はこのよう
な原因によることは経験的に確かめられている。
[0007] The negative surface due to the shape has a great influence on the strength of the refractory layer around the nozzle receiving brick. The refractory layer 106 is in contact with the rectangular outer peripheral surface 143 and repeatedly receives different thermal stresses depending on its position. In particular, the rectangular corner portion acts as an edge to concentrate the stress, and when a crack is generated in this portion, it rapidly expands. That is inevitable. Also, when the refractory layer is formed by grinding irregular shaped refractories, it is difficult to compact around the square corners, and the strength itself after molding must be low, so rapid heating and cooling When the heat cycle is repeated, the tendency of cracks and gaps to be generated further increases. Once a gap has been created, there is a great deal of concern that the molten metal will sew through the gap and reach straight down to the bottom of the ladle body after receiving the hot water on the ladle, It has been empirically confirmed that this is the cause.

【0008】取鍋の底面を形成するスタンプ材やレンガ
の損傷を防止する従来技術としては、たとえば実公平2
−8597号では図8のように取鍋の側壁と底面外周の
コーナー部分の溶損が最も激しいので、底敷きレンガ2
01の外周レンガを1つ置き、または2つ置き毎に底敷
きレンガより30〜80mm背高の長尺レンガ202を
配置し、取鍋の中心方向に傾斜して充填したスタンプ材
203で覆い埋設した構成を示している。この構成によ
ってコーナー部の溶損を防ぎ耐用回数の低下を解決した
と謳っているが、この考案の要旨は取鍋のコーナー部に
限定され、本発明が直面するストッパーノズル周辺の耐
火性の喪失と湯漏れ事故防止という課題に直接応えるも
のでないことは言うまでもない。
[0008] As a conventional technique for preventing damage to a stamp material or a brick forming a bottom surface of a ladle, for example, Japanese Utility Model Application Publication No.
In -8597, as shown in Fig. 8, the most severe erosion of the ladle's side walls and the corners on the outer periphery of the bottom surface.
No. 01 peripheral bricks are placed every other or every two bricks, and long bricks 202 that are 30 to 80 mm higher than the bottom bricks are arranged, and are buried with a stamp material 203 that is inclined and filled in the direction of the center of the ladle. FIG. It is stated that this configuration prevented the melting of the corners and solved the reduction in the number of service life, but the gist of this invention was limited to the corners of the ladle, and the loss of fire resistance around the stopper nozzle faced by the present invention. Needless to say, it does not directly address the problem of preventing hot water leaks.

【0009】本発明は以上の課題を解決するために、耐
火性を格段に向上して湯漏れ事故を顕著に減少させる底
注ぎ式取鍋のストッパーノズル周辺の耐火構造の提供を
目的とする。
SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to provide a fireproof structure around a stopper nozzle of a bottom-pour ladle that remarkably improves fire resistance and significantly reduces a leak of molten metal.

【0010】[0010]

【課題を解決するための手段】本発明に係る底注ぎ式取
鍋のストッパーノズル周辺の耐火構造は、昇降自在に吊
支されたストッパーヘッド7が当接する円錐台形状のス
トッパーノズル1を取鍋本体2の底面21上に固定し、
該ストッパーノズル1の前記円錐面11を内嵌する逆円
錐面よりなる嵌合孔41を中心に具え、段差42を以て
取鍋の上方向に向って縮径した外周面43を有するノズ
ル受けレンガ4を配置し、さらに底面21に敷き並べた
底敷きレンガ3からノズル受けレンガ4の頂面44に至
る厚さに亘り前記外周面43から取鍋の側壁レンガ5ま
での底面を不定形耐火物で均等に搗き固めて耐火層6を
形成したことを特徴とする。
According to the present invention, a fireproof structure around a stopper nozzle of a bottom pouring ladle according to the present invention comprises a truncated cone-shaped stopper nozzle 1 with which a stopper head 7 suspended and movable up and down abuts. Fixed on the bottom surface 21 of the main body 2,
A nozzle receiving brick 4 having a fitting hole 41 formed of an inverted conical surface in which the conical surface 11 of the stopper nozzle 1 is internally fitted, and having an outer peripheral surface 43 reduced in diameter toward the upper side of the ladle with a step 42. The bottom surface from the outer peripheral surface 43 to the side wall brick 5 of the ladle over the thickness from the bottom brick 3 laid on the bottom surface 21 to the top surface 44 of the nozzle receiving brick 4 is further formed of an irregular-shaped refractory. It is characterized in that the refractory layer 6 is formed by evenly hardening.

【0011】この構成によってノズル受けレンガ4は、
図2で例示するように嵌合孔41から外周面43までの
最短距離Rがすべて同一であるのみならず、段差42を
もって上方に対して縮径しているから、嵌合孔41の傾
斜に基づく上下方向の肉厚rの不同も大幅に吸収してど
の外周面から計っても熱膨張量はほぼ同じレベル内に収
まり、隣接する耐火層6の何れの部分に対してもほぼ同
じ膨張・収縮で接して亀裂の発生や割れの伸張は確実に
軽減される。
With this configuration, the nozzle receiving brick 4 is
As illustrated in FIG. 2, not only are the shortest distances R from the fitting hole 41 to the outer peripheral surface 43 all the same, but the diameter of the fitting hole 41 is also reduced upward with the step 42. The difference in wall thickness r in the vertical direction is greatly absorbed, so that the amount of thermal expansion stays within substantially the same level no matter what the outer peripheral surface is measured, and almost the same amount of expansion and expansion occurs in any part of the adjacent refractory layer 6. The occurrence of cracks and the extension of cracks due to contraction are reliably reduced.

【0012】またノズル受けレンガ4の外周面43は、
どの断面についても円形であるから、隣接する耐火層を
搗き固めて形成するとき、ムラなく均等に締め固められ
た一定強度と密度を具えた底面を形成して、亀裂の発生
防止に強い抑止力を発揮する。また、上方に向って縮径
する段差42を具えているから、仮に膨張・収縮の繰り
返しによって耐火層6とノズル受けレンガ4の外周面4
3との間に隙間が生じたとしても、この隙間から潜り込
んだ溶湯が耐火層6内に埋没した段差42に衝き当って
進路を阻まれ、この位置で流れを渋滞させる抵抗帯を形
成するから、従来技術のようにストレートに外周面に添
って底面まで容易に到達することができないという作用
が顕われる。以上の特有の作用が相互に関連し合って発
現することにより、従来技術における課題は大幅に解決
することができる。
The outer peripheral surface 43 of the nozzle receiving brick 4 is
Each cross section is circular, so when the adjacent refractory layer is polished and formed, a bottom surface with a uniform strength and density that is evenly compacted is formed, and a strong deterrent to prevent cracking. Demonstrate. In addition, since there is provided a step 42 whose diameter is reduced upward, the refractory layer 6 and the outer peripheral surface 4 of the nozzle receiving brick 4 are tentatively subjected to repeated expansion and contraction.
Even if a gap is formed between the refractory layer 3 and the molten metal 3, the molten metal sneaked through the gap collides with the step 42 buried in the refractory layer 6 to block the course and form a resistance zone that blocks traffic at this position. However, there is an effect that a straight line cannot be easily reached to a bottom surface along an outer peripheral surface as in the related art. The problems in the prior art can be largely solved by expressing the above-described specific actions in association with each other.

【0013】[0013]

【発明の実施の形態】図1は本発明の実施形態を示す縦
断正面図であり、図2はその中のノズル受けレンガ4だ
けの平面図(A)と正面図(B)である。取鍋本体2自
体は従来技術ととくに変るところはないから図示は省略
し、図1に底面21、該底面21に穿孔した注湯口22
だけを示す。取鍋本体2内に受湯した溶湯の鋳造は吊支
するストッパーヘッドを上昇してストッパーノズル1の
中央に貫通したノズル孔12の内周曲面とストッパーヘ
ッド7の先端の外周曲面71との密着を外し、溶湯をノ
ズル孔12から流下させて行なう。ストッパーノズルの
外周面は上方に向けて縮径する円錐面11で形成され、
取鍋本体2へは鉄板製のノズル抑え72を底面21の外
側から当てがいコッターピン73を打ち込んで固定した
位置に支持する。底面21の上面には底敷きレンガ3を
敷き並べて下地を形成し、底敷きレンガ3の上面にスト
ッパーノズル1を内嵌したノズル受けレンガ4を配置す
る。
FIG. 1 is a longitudinal sectional front view showing an embodiment of the present invention, and FIG. 2 is a plan view (A) and a front view (B) of only a nozzle receiving brick 4 therein. The ladle main body 2 itself is not particularly different from the prior art, so that the illustration thereof is omitted, and a bottom surface 21 and a pouring hole 22 perforated in the bottom surface 21 are shown in FIG.
Just show. The casting of the molten metal received in the ladle main body 2 is performed by raising the stopper head to be suspended and closely contacting the inner peripheral curved surface of the nozzle hole 12 penetrating into the center of the stopper nozzle 1 and the outer peripheral curved surface 71 at the tip of the stopper head 7. , And the molten metal is caused to flow down from the nozzle hole 12. The outer peripheral surface of the stopper nozzle is formed by a conical surface 11 whose diameter decreases upward,
The nozzle holder 72 made of iron plate is supported on the ladle main body 2 at a fixed position by driving a cotter pin 73 from outside the bottom surface 21. On the upper surface of the bottom surface 21, the base brick 3 is laid and arranged to form a base, and the nozzle receiving brick 4 in which the stopper nozzle 1 is fitted is disposed on the upper surface of the base brick 3.

【0014】ノズル受けレンガ4は段差42を以て上方
に縮径した段付きの円筒体からなり、内面側はストッパ
ーノズル1の円錐面11と適合する逆勾配面よりなる嵌
合孔41を具えてストッパーノズル1を嵌合する。寸法
関係を例示すれば、取鍋本体2の底面21は厚さ16m
mの鉄板で成形され、厚さ30mmの、いわゆる半片レ
ンガを以て底敷きレンガ3としている。ストッパーノズ
ルの円錐面11は底部で152mm、縮径した頂部で1
30mmの傾斜を形成してノズル受けレンガ4の嵌合孔
41へ内嵌され、ノズル受けレンガ4の全高は130m
mであり、頂面44から高さ80mmの外周面に水平方
向で25mmの段差42を設ける。この段差の設定によ
ってノズル受けレンガの肉厚の変動差は、図2に例示し
た通り、円周方向Rについては一定となり、上下方向の
肉厚差r1/r2は1:0.9となって熱膨張の総量の部
分差を大幅に縮小する。
The nozzle receiving brick 4 is formed of a stepped cylindrical body whose diameter is reduced upward by a step 42, and the inner surface side is provided with a fitting hole 41 having an inversely sloped surface compatible with the conical surface 11 of the stopper nozzle 1. The nozzle 1 is fitted. To illustrate the dimensional relationship, the bottom surface 21 of the ladle body 2 is 16 m thick.
m, made of an iron plate and having a thickness of 30 mm. The conical surface 11 of the stopper nozzle is 152 mm at the bottom and 1 mm at the top at the reduced diameter.
The nozzle receiving brick 4 is fitted into the fitting hole 41 of the nozzle receiving brick 4 with a slope of 30 mm, and the total height of the nozzle receiving brick 4 is 130 m.
m and a step 42 having a height of 25 mm in the horizontal direction is provided on the outer peripheral surface having a height of 80 mm from the top surface 44. Due to the setting of the step, the variation in the thickness of the nozzle receiving brick is constant in the circumferential direction R as illustrated in FIG. 2, and the thickness difference r1 / r2 in the vertical direction is 1: 0.9. Significantly reduce the partial difference in the total amount of thermal expansion.

【0015】[0015]

【発明の効果】本発明は以上述べたようにノズル受けレ
ンガの形状を段付きの円筒体に改善したから、肉厚が何
れの位置においてもほぼ均等となり、急熱に伴う熱衝撃
も全周に亘って非常に狭小な範囲内に留まり、膨張収縮
の不均一のために発生する亀裂、割れを最小限に抑制す
る効果がある。また、角形のようなコーナー部がないか
ら、隣接する耐火層内に局部的な熱応力が集中し割れの
伸張に拍車を掛ける傾向にも歯止めを施す効果が働き、
たとえば従来は約25回の使用によって寿命が尽き新品
と交換していた実績を、最低50回は信頼して使用でき
るという成果も記録されている。
As described above, according to the present invention, the shape of the nozzle receiving brick is improved to a stepped cylindrical body, so that the wall thickness becomes almost uniform at any position, and the thermal shock caused by rapid heating is reduced over the entire circumference. And has an effect of minimizing cracks and cracks generated due to uneven expansion and contraction. In addition, since there is no corner like a square, the effect of stopping the local thermal stress in the adjacent refractory layer and also tending to spur the extension of the crack works,
For example, a record has been recorded that, in the past, the service life was exhausted after about 25 uses and a new one was used, but at least 50 times can be used reliably.

【0016】一方、取鍋内張りの作業においても、不定
形耐火物を搗き固めて耐火層を形成する際、ノズル受け
レンガには角張ったコーナー部がなく接する境界面全周
が円形であるから、均等に搗き固めることができて強
度、密度が満遍なく強化され、段差42を耐火層内に埋
設しているから、ノズル受けレンガ外周面と耐火層との
境界に隙間を生じても、溶湯は段差によって進路を遮ら
れ湯漏れが起こり難い効果が顕著である。何よりも出
鋼、受湯、搬送、鋳造の各工程において、取鍋の注湯口
から湯漏れが生じて作業員の火傷や設備の焼損など安全
上、重大な事故に繋がる原因を払拭する効果は他を以て
は換え難い。
On the other hand, even in the work of ladle lining, when the refractory layer is formed by crushing irregular-shaped refractories, since the nozzle receiving brick has no angular corners and the entire boundary surface in contact therewith is circular, Since the strength and density can be evenly polished and the strength and density are evenly strengthened and the step 42 is embedded in the refractory layer, even if there is a gap at the boundary between the nozzle receiving brick outer peripheral surface and the refractory layer, the molten metal has a step The effect of blocking the course and preventing leakage of hot water is remarkable. Above all, in each process of tapping, receiving hot water, transporting and casting, the effect of wiping out the cause of a serious accident on safety, such as burns of workers and burnout of equipment due to molten metal leaking from the pouring port of the ladle. Difficult to replace with others.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の実施形態の要部を示す縦断正面図であ
る。
FIG. 1 is a vertical sectional front view showing a main part of an embodiment of the present invention.

【図2】同形態のノズル受けレンガの平面図(A)と正
面図(B)である。
FIG. 2 is a plan view (A) and a front view (B) of a nozzle receiving brick of the same embodiment.

【図3】底注ぎ式取鍋全体の正面図(A)と側面図
(B)である。
FIG. 3 is a front view (A) and a side view (B) of the entire bottom pouring ladle.

【図4】従来技術を略示する全体の縦断正面図である。FIG. 4 is an overall vertical sectional front view schematically showing a conventional technique.

【図5】従来技術の要部を示す縦断正面図である。FIG. 5 is a longitudinal sectional front view showing a main part of a conventional technique.

【図6】従来技術のノズル受けレンガの平面図(A)と
正面図(B)である。
FIG. 6 is a plan view (A) and a front view (B) of a conventional nozzle receiving brick.

【図7】別の従来技術のノズル受けレンガの平面図
(A)と正面図(B)である。
FIG. 7 is a plan view (A) and a front view (B) of another conventional nozzle receiving brick.

【図8】さらに別の従来技術の要部の断面図である。FIG. 8 is a cross-sectional view of a main part of still another conventional technique.

【符号の説明】[Explanation of symbols]

1 ストッパーノズル 2 取鍋本体 3 底敷きレンガ 4 ノズル受けレンガ 5 側壁レンガ 6 耐火層 7 ストッパーヘッド 11 円錐面 12 ノズル孔 21 底面 22 注湯口 41 嵌合孔 42 段差 43 外周面 44 頂面 DESCRIPTION OF SYMBOLS 1 Stopper nozzle 2 Ladle main body 3 Laying bottom brick 4 Nozzle receiving brick 5 Side wall brick 6 Fireproof layer 7 Stopper head 11 Conical surface 12 Nozzle hole 21 Bottom surface 22 Filling hole 41 Fitting hole 42 Step 43 Outer peripheral surface 44 Top surface

フロントページの続き (56)参考文献 特開 昭63−119971(JP,A) 特開 昭59−174267(JP,A) 特開 平8−117987(JP,A) 特開 平1−80257(JP,A) 特開 平9−314315(JP,A) 特開 平7−68357(JP,A) 特開 昭56−66358(JP,A) 実開 昭59−49457(JP,U) 実開 平5−13658(JP,U) 実開 昭56−45563(JP,U) 実開 平7−15152(JP,U) 実開 昭58−85463(JP,U) 実開 平6−83146(JP,U) 実開 昭51−93813(JP,U) 特表 平9−506299(JP,A) (58)調査した分野(Int.Cl.7,DB名) B22D 41/50 520 B22D 11/10 320 B22D 41/02 Continuation of the front page (56) References JP-A-63-119971 (JP, A) JP-A-59-174267 (JP, A) JP-A-8-117987 (JP, A) JP-A-1-80257 (JP) JP-A-9-314315 (JP, A) JP-A-7-68357 (JP, A) JP-A-56-66358 (JP, A) JP-A-59-49457 (JP, U) JP-A-59-49457 (JP, U) 5-13658 (JP, U) Japanese Utility Model Showa 56-45563 (JP, U) Japanese Utility Model 7-15152 (JP, U) Japanese Utility Model Showa 58-85463 (JP, U) Japanese Utility Model Utility Model 6-83146 (JP, U) U) Japanese Utility Model Showa 51-93813 (JP, U) Table 9-506299 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) B22D 41/50 520 B22D 11/10 320 B22D 41/02

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】 底注ぎ式取鍋のストッパーノズル周辺の
耐火構造において、昇降自在に吊支されたストッパーヘ
ッド7が当接する円錐台形状のストッパーノズル1を取
鍋本体2の底面21上に固定し、該ストッパーノズル1
の前記円錐面11を内嵌する逆円錐面よりなる嵌合孔4
1を中心に具え、段差42を以て取鍋の上方向に向って
縮径した外周面43を有するノズル受けレンガ4を配置
し、さらに底面21に敷き並べた底敷きレンガ3からノ
ズル受けレンガ4の頂面44に至る厚さに亘り前記外周
面43から取鍋の側壁レンガ5までの底面を不定形耐火
物で均等に搗き固めて耐火層6を形成したことを特徴と
する底注ぎ式取鍋のストッパーノズル周辺の耐火構造。
In a fireproof structure around a stopper nozzle of a bottom pouring ladle, a truncated conical stopper nozzle 1 to which a stopper head 7 suspended and raised and lowered is abutted is fixed on a bottom surface 21 of a ladle body 2. And the stopper nozzle 1
Fitting hole 4 having an inverted conical surface for internally fitting said conical surface 11
1 and a nozzle receiving brick 4 having an outer peripheral surface 43 whose diameter is reduced toward the upper side of the ladle with a step 42, and further from the bottom laying brick 3 laid on the bottom surface 21 to the nozzle receiving brick 4 A bottom-pouring ladle characterized in that a bottom surface from the outer peripheral surface 43 to the side wall brick 5 of the ladle is uniformly polished with an irregular refractory over a thickness reaching the top surface 44 to form a refractory layer 6. Fire-resistant structure around the stopper nozzle.
JP10071477A 1998-03-04 1998-03-04 Fire resistant structure around the stopper nozzle of the bottom pouring ladle Expired - Fee Related JP3139674B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10071477A JP3139674B2 (en) 1998-03-04 1998-03-04 Fire resistant structure around the stopper nozzle of the bottom pouring ladle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10071477A JP3139674B2 (en) 1998-03-04 1998-03-04 Fire resistant structure around the stopper nozzle of the bottom pouring ladle

Publications (2)

Publication Number Publication Date
JPH11245017A JPH11245017A (en) 1999-09-14
JP3139674B2 true JP3139674B2 (en) 2001-03-05

Family

ID=13461761

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10071477A Expired - Fee Related JP3139674B2 (en) 1998-03-04 1998-03-04 Fire resistant structure around the stopper nozzle of the bottom pouring ladle

Country Status (1)

Country Link
JP (1) JP3139674B2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9375785B2 (en) 2011-06-26 2016-06-28 Inductotherm Corp. Molten metal holding and pouring box with dual pouring nozzles
CN102328068A (en) * 2011-07-08 2012-01-25 南阳汉冶特钢有限公司 Method for constructing bottom of steel ladle
JP5556942B2 (en) * 2013-08-02 2014-07-23 新日鐵住金株式会社 Precast block refractory and ladle lay structure using this precast block refractory
JP2019150863A (en) * 2018-03-06 2019-09-12 黒崎播磨株式会社 Installation structure of tuyere

Also Published As

Publication number Publication date
JPH11245017A (en) 1999-09-14

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