JP5057359B2 - Cleaning device in the hot-dip bath snout - Google Patents
Cleaning device in the hot-dip bath snout Download PDFInfo
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- JP5057359B2 JP5057359B2 JP2006179870A JP2006179870A JP5057359B2 JP 5057359 B2 JP5057359 B2 JP 5057359B2 JP 2006179870 A JP2006179870 A JP 2006179870A JP 2006179870 A JP2006179870 A JP 2006179870A JP 5057359 B2 JP5057359 B2 JP 5057359B2
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Description
本発明は、連続溶融メッキ装置に関し、特にメッキ浴槽のスナウト内の清浄装置に関するものである。 The present invention relates to a continuous hot dipping apparatus, and more particularly to a cleaning apparatus in a plating bath snout.
連続溶融メッキラインでは、還元雰囲気の連続焼鈍炉で機械的性質やメッキ浴への浸入温度を調整されたストリップ(帯鋼板)は、大気雰囲気から遮断して清浄なままメッキ浴に送り込む役目の筒状スナウトを通って、メッキ浴に入る。その後、ストリップは浴中のシンクロール,サポートロールを介して上方に引き上げられ、ガスワイピングノズルでメッキ層の付着量が調整される(図1,図2)。 In the continuous hot dipping line, strips (strips), whose mechanical properties and penetration temperature into the plating bath are adjusted in a continuous annealing furnace in a reducing atmosphere, are cut off from the atmosphere and sent to the plating bath in a clean state. Pass the snout and enter the plating bath. Thereafter, the strip is pulled upward through a sink roll and a support roll in the bath, and the amount of plating layer deposited is adjusted by a gas wiping nozzle (FIGS. 1 and 2).
このスナウト内は、水素と窒素の混合ガスを吹き込んで還元雰囲気としているのが通常であるが、スナウト内のメッキ浴表面から金属ヒュームが発生し、比較的温度の低いスナウト内壁面に付着する。また、スナウト前の炉内壁面やロールに付着することもある。これは、一般的に灰状の不純物(溶融亜鉛では純亜鉛や酸化亜鉛等)でアッシュと呼ばれているものである。 The inside of the snout is usually a reducing atmosphere by blowing a mixed gas of hydrogen and nitrogen, but metal fume is generated from the plating bath surface in the snout and adheres to the inner wall surface of the snout having a relatively low temperature. Moreover, it may adhere to the furnace inner wall surface or roll before snout. This is an ash-like impurity (such as pure zinc or zinc oxide in molten zinc) and is called ash.
このアッシュが堆積して落下すると、浴表面上に浮上し、ストリップに引き込まれるとドロス欠陥や不メッキ欠陥発生の原因となる。炉内ロールに付着すると、ストリップに接触して表面欠陥の原因となる。 When this ash accumulates and falls, it floats on the surface of the bath, and when drawn into the strip, it causes dross defects and non-plating defects. When it adheres to the in-furnace roll, it contacts the strip and causes surface defects.
従来技術としては最も主流なものは、スナウト内の液面に、鋼帯の近くでその幅方向に沿う液流れが生ずるように、一対の吐出口と吸い込み口が設けられ、これらにそれぞれ吐出管路と吸い込み管路を介して吐出ポンプおよび吸い込みポンプが設けられていた。そして、スナウト内に強制的な流れを作り、浮遊するアッシュを回収する方法である。ここで、スナウト内の湯面の面積が増加すると蒸発する金属ヒュームの量が増えてアッシュが増えるため、スナウト内の湯面の面積を同一とする必要がある。そのため、従来は吐出管路をスナウトに沿って、湯面に対し傾斜した状態でスナウト内に挿入していた。 The most mainstream of the prior art is that a pair of discharge ports and suction ports are provided on the liquid surface in the snout so that a liquid flow is generated along the width direction near the steel strip. A discharge pump and a suction pump were provided through the passage and the suction pipe. And it is the method of making a forced flow in the snout and collecting the floating ash. Here, if the area of the hot water surface in the snout increases, the amount of the metal fume that evaporates increases and the ash increases, so that the hot water surface area in the snout needs to be the same. Therefore, conventionally, the discharge pipe has been inserted into the snout while being inclined with respect to the molten metal surface along the snout.
しかし、吐出管路をスナウト内で湯面に対し傾斜した状態で挿入すると、図5の点線矢印のように、入側では湯流れがストリップに対して大回りになり、アッシュを回収できず、ストリップと共に引き込まれ、完全に品質異常を防止できなかった。 However, if the discharge pipe is inserted in the snout while being inclined with respect to the hot water surface, as shown by the dotted line arrow in FIG. It was pulled in with it, and quality abnormality could not be prevented completely.
本発明は上記課題を解決し、溶融メッキラインのスナウト内壁面に付着するアッシュによるストリップの品質異常を抑制できる装置を提供することを目的とする。 An object of the present invention is to solve the above-mentioned problems and to provide an apparatus capable of suppressing strip quality abnormality due to ash adhering to the inner wall surface of a snout of a hot dipping line.
本発明の第1課題解決手段は、メッキ浴槽の溶融金属内に設置されたシンクロールに案内された鋼帯が、スナウトに囲まれて斜め上方から下方に導入され、次いで上方に導出されるよう構成され、液面直上で鋼帯を挟んでガスワイピング用ノズルヘッダーが対向し、スナウト内の液面に、鋼帯の近くでその幅方向に沿う液流れが生ずるように、一対の吐出口と吸い込み口が設けられ、これらにそれぞれ吐出管路と吸い込み管路を介して吐出ポンプおよび吸い込みポンプが設けられているものにおいて、前記吐出管路は鉛直状態で立ち上がり、鋼帯を囲む前記スナウトの水平断面において、鋼帯が浴槽から立ち上がり出て行く部分に近い出側壁に対向する入側壁は、前記吐出管路の立ち上がり部と入側壁が干渉しないように、スナウト先部分の下端までと、鋼帯の経路から鋼帯幅方向に外れた範囲までの部分において、下端から湯面近くでそれより下までほぼ鉛直に立ち上がっていることである。
The first problem-solving means of the present invention is such that the steel strip guided by the sink roll installed in the molten metal of the plating bath is introduced from the diagonally upward to the downward, surrounded by the snout, and then led upward. A pair of discharge ports, so that the gas wiping nozzle header faces the steel strip directly above the liquid surface, and the liquid surface in the snout has a liquid flow in the width direction near the steel strip. A suction port is provided, and each of which is provided with a discharge pump and a suction pump via a discharge pipe and a suction pipe, respectively, the discharge pipe rises in a vertical state, and the horizontal of the snout surrounding the steel strip in cross section, the input sidewalls steel strip facing the side wall out close to the portion exiting rising from the bath, the as rising portion and the inlet sidewall of the discharge line it does not interfere with the snout destination portion And to the end, in the portion from the path of the strip to the extent that out the steel strip width direction, is that rises substantially vertically to the bottom than near the melt surface from the bottom.
本発明の第2課題解決手段は、メッキ浴槽の溶融金属内に設置されたシンクロールに案内された鋼帯が、スナウトに囲まれて斜め上方から下方に導入され、次いで上方に導出されるよう構成され、液面直上で鋼帯を挟んでガスワイピング用ノズルヘッダーが対向し、スナウト内の液面に、鋼帯の近くでその幅方向に沿う液流れが生ずるように、一対の吐出口と吸い込み口が設けられ、これらにそれぞれ吐出管路と吸い込み管路を介して吐出ポンプおよび吸い込みポンプが設けられているものにおいて、前記吐出管路は鉛直状態で立ち上がり、鋼帯を囲む前記スナウトの水平断面において、鋼帯が浴槽から立ち上がり出て行く部分に近い出側壁に対向する入側壁は、前記吐出管路から吸い込み管路側に至る全幅において、下端から湯面近くでそれより下までほぼ鉛直に立ち上がっていることである。
The second problem-solving means of the present invention is such that the steel strip guided by the sink roll installed in the molten metal of the plating bath is introduced from the upper side to the lower side surrounded by the snout, and then led out upward. A pair of discharge ports, so that the gas wiping nozzle header faces the steel strip directly above the liquid surface, and the liquid surface in the snout has a liquid flow in the width direction near the steel strip. A suction port is provided, and each of which is provided with a discharge pump and a suction pump via a discharge pipe and a suction pipe, respectively, the discharge pipe rises in a vertical state, and the horizontal of the snout surrounding the steel strip in cross section, the input sidewalls strip faces the side wall out close to the portion exiting rising from the bath, in the full width leading to the suction pipe roadside from the discharge conduit, the molten metal surface near the lower end Desolation Is that rises substantially vertically more to the bottom.
本発明により、溶融メッキラインのスナウト内壁面に付着するアッシュによるストリップの品質異常が抑制できることとなった。 According to the present invention, it is possible to suppress the strip quality abnormality due to the ash adhering to the snout inner wall surface of the hot dipping line.
以下に本発明の一実施例を図面にもとづき説明する。
図1,2において、メッキ浴槽P1の溶融金属内に設置されたシンクロールP2に案内された鋼帯Aが、スナウトP4に囲まれて斜め上方から下方に導入されて上方に導出されるよう構成され、液面直上で上方への鋼帯を挟んでガスワイピング用ノズルヘッダーP3が対向している。
An embodiment of the present invention will be described below with reference to the drawings.
1 and 2, the steel strip A guided by the sink roll P2 installed in the molten metal of the plating bath P1 is surrounded by the snout P4 so as to be introduced obliquely from below and led out upward. In addition, the gas wiping nozzle header P3 is opposed to the upper surface of the steel plate with the steel strip facing upward.
図2,3において、スナウト内の液面に、鋼帯Aの近くでその幅方向に沿う液流れが生ずるように、一対の吐出口1と吸い込み口2が設けられ、これらにそれぞれ吐出管路3と吸い込み管路4を介して、吐出ポンプ5および吸い込みポンプ6が設けられている。
2 and 3, a pair of
さてここで図4,5,6において、前記吐出管路3は鉛直またはそれに近い状態で立ち上がっている。また、スナウトの先部分P41は、本体部分P42に対して溶接で取り付けられている。そして、鋼帯Aを囲む前記スナウトの水平断面において、鋼帯が浴槽から立ち上がり出て行く部分に近い出側壁に対向する入側壁は、前記吐出管路3に近い部分において、該吐出管路の立ち上がり部分の回りに空間を確保するように、下端から湯面近くまでほぼ鉛直に立ち上がって、鉛直壁P41aとなっている。このように、前記吐出管路3に近い部分においてとは、吐出管路の立ち上がり部と入側壁が干渉しないように、スナウト先部分P41の下端までであり、鋼帯Aの経路から鋼帯幅方向に外れた範囲までである。また、湯面近くまでとは、湯面近くでそれより下の位置までである。また、スナウト先部分P41の内面には、溶融金属塊の発生成長を抑制するため、表面処理(溶射)が施されている。
Now, in FIGS. 4, 5, and 6, the
以上において、作動状態を説明する。本装置の通常運転時において、ポンプ5,6を常時、運転しておく。そして、スナウト内で溶融金属を前記吐出口1から供給し、鋼帯の幅方向中央部の表面および裏面に沿って液流を噴出させる。そして図5に示すように、鋼帯Aに沿った液流を幅方向一端から他端側へ流動させ、前記吸い込み口2から溶融金属とドロスを吸い込み、スナウトの外方に導くのである。
The operating state will be described above. During the normal operation of this apparatus, the
このように、前記吐出管路3は鉛直またはそれに近い状態で立ち上がっているので、
吐出管路3内を下から上に流れて来た流体は、鋼帯の幅方向に沿うように方向転換できるようになったのである。
Thus, since the
The fluid flowing from the bottom to the top in the
〔実施例〕
実施条件
(1)連続溶融メッキラインで実施
(2)運転条件は、ライン速度:50〜160m/s、板厚:0.2〜1.0mm、板幅:600〜1200mm、メッキ浴温度:460℃。
(3)スナウト仕様は、スナウト材質:SUS316L、
溶射方法:高速ガス炎溶射法、溶射仕様:W系サーメット,膜厚0.1t以上、
溶射範囲:スナウト内全面、封孔処理を溶射皮膜全面に施工。
スナウト先部分P41の主要部の寸法:図8,9に示したもの(単位mm)
吐出ポンプ5および吸い込みポンプ6の流量: 110L/min
実験結果
ドロス欠陥や不メッキ欠陥の品質異状発生率は、実施前:2%、実施後:1%
〔Example〕
Implementation conditions
(1) Implemented in continuous hot dipping line
(2) The operating conditions are: line speed: 50 to 160 m / s, plate thickness: 0.2 to 1.0 mm, plate width: 600 to 1200 mm, plating bath temperature: 460 ° C.
(3) Snout specification is snout material: SUS316L,
Thermal spraying method: High-speed gas flame spraying method, Thermal spraying specification: W-based cermet, film thickness 0.1t or more,
Thermal spraying range: The entire surface of the snout and the sealing treatment are applied to the entire thermal spray coating.
Dimensions of the main part of the snout tip portion P41: those shown in FIGS. 8 and 9 (unit: mm)
Flow rate of discharge pump 5 and suction pump 6: 110 L / min
Experimental results The rate of occurrence of abnormalities in quality of dross defects and non-plating defects is 2% before implementation: 1% after implementation
本発明は前記した実施例や実施態様に限定されず、特許請求の範囲および範囲を逸脱せずに種々の変形を含む。 The present invention is not limited to the examples and embodiments described above, and includes various modifications without departing from the scope and scope of the claims.
本発明は溶融メッキ浴槽のスナウト内の清浄装置に利用される。 The present invention is used in a cleaning device in a hot dipped bath snout.
A 鋼帯
P1 メッキ浴槽
P2 シンクロール
P3 ノズルヘッダー
P4 スナウト
1 吐出口
2 吸い込み口
3 吐出管路
4 吸い込み管路
5 吐出ポンプ
6 吸い込みポンプ
A Steel strip P1 Plating bath P2 Sink roll P3 Nozzle
Claims (2)
前記吐出管路は鉛直状態で立ち上がり、
鋼帯を囲む前記スナウトの水平断面において、鋼帯が浴槽から立ち上がり出て行く部分に近い出側壁に対向する入側壁は、前記吐出管路の立ち上がり部と入側壁が干渉しないように、スナウト先部分の下端までと、鋼帯の経路から鋼帯幅方向に外れた範囲までの部分において、下端から湯面近くでそれより下まで、ほぼ鉛直に立ち上がっていることを特徴とする溶融メッキ浴槽のスナウト内の清浄装置。 The steel strip guided by the sink roll installed in the molten metal of the plating bath is configured to be introduced from diagonally upward to downward, surrounded by snout, and then led out upward. A pair of discharge ports and suction ports are provided on the liquid surface in the snout so that a liquid flow is generated along the width direction near the steel strip. In the case where the discharge pump and the suction pump are provided via the pipeline and the suction pipeline,
The discharge pipe rises in a vertical state,
In the horizontal cross section of the snout that surrounds the steel strip, the entrance wall facing the exit wall near the portion where the steel strip rises out of the bathtub is positioned so that the rising portion of the discharge pipe does not interfere with the entrance wall. The hot dipped bath is characterized in that it stands up almost vertically from the lower end to near the surface of the molten metal and below it, up to the lower end of the portion, and in the portion extending from the path of the steel strip in the width direction of the steel strip . Cleaning device in the snout.
前記吐出管路は鉛直状態で立ち上がり、
鋼帯を囲む前記スナウトの水平断面において、鋼帯が浴槽から立ち上がり出て行く部分に近い出側壁に対向する入側壁は、前記吐出管路から吸い込み管路側に至る全幅において、下端から湯面近くでそれより下までほぼ鉛直に立ち上がっていることを特徴とする溶融メッキ浴槽のスナウト内の清浄装置。 The steel strip guided by the sink roll installed in the molten metal of the plating bath is configured to be introduced from diagonally upward to downward, surrounded by snout, and then led out upward. A pair of discharge ports and suction ports are provided on the liquid surface in the snout so that a liquid flow is generated along the width direction near the steel strip. In the case where the discharge pump and the suction pump are provided via the pipeline and the suction pipeline,
The discharge pipe rises in a vertical state,
In the horizontal cross section of the snout surrounding the steel strip, the entrance wall facing the exit wall near the portion where the steel strip rises out of the bathtub is close to the hot water surface from the lower end in the entire width from the discharge conduit to the suction conduit side. A cleaning device for the inside of a hot dipped bath snout, characterized in that it stands up almost vertically to the bottom .
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DE102013101131A1 (en) * | 2013-02-05 | 2014-08-07 | Thyssenkrupp Steel Europe Ag | Apparatus for hot dip coating of metal strip |
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JPS6048586B2 (en) * | 1977-07-12 | 1985-10-28 | 川崎製鉄株式会社 | Double-sided hot dip galvanizing equipment |
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