JP3186654B2 - Cleaning nozzle arrangement structure for molten metal plating line - Google Patents
Cleaning nozzle arrangement structure for molten metal plating lineInfo
- Publication number
- JP3186654B2 JP3186654B2 JP19605097A JP19605097A JP3186654B2 JP 3186654 B2 JP3186654 B2 JP 3186654B2 JP 19605097 A JP19605097 A JP 19605097A JP 19605097 A JP19605097 A JP 19605097A JP 3186654 B2 JP3186654 B2 JP 3186654B2
- Authority
- JP
- Japan
- Prior art keywords
- steel strip
- cooling zone
- outlet
- ash
- cleaning nozzle
- 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
Links
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- Coating With Molten Metal (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は溶融金属メッキライ
ンのアッシュ対策技術に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technology for preventing ash in a molten metal plating line.
【０００２】[0002]
【従来の技術】図８は従来の溶融金属メッキラインの原
理図であり、溶融金属メッキライン１００は、加熱帯１
０２と冷却帯１０３とを備えた連続炉１０１の冷却帯出
口１０４から、下向き筒状のスナウト１０５を延ばし、
このスナウト１０５の下端を溶融金属メッキ槽１０６の
メッキ液１０７へ差込む連続処理設備であり、図右端の
コイル１０８を巻戻しながら、矢印の如く連続炉１０
１へ装入し、加熱帯１０２で所定の温度に加熱し、保持
し、冷却帯１０３で冷却することで、焼鈍を施し、冷却
帯出口１０４に設けた第１出口ロール１０９及び第２出
口ロール１１０でＳ字状に案内することで、水平から斜
めへ矢印の如く向きを変えさせた後にメッキ液１０７
に浸漬させることで、金属メッキ鋼板を大量に製造する
ものである。2. Description of the Related Art FIG. 8 is a diagram showing the principle of a conventional hot-dip metal plating line.
02 and a cooling zone 103, a downwardly extending cylindrical snout 105 is extended from the cooling zone outlet 104 of the continuous furnace 101,
This is a continuous processing facility in which the lower end of the snout 105 is inserted into the plating solution 107 of the molten metal plating tank 106.
1, heated to a predetermined temperature in a heating zone 102, held and cooled in a cooling zone 103, and then annealed, and a first outlet roll 109 and a second outlet roll provided at a cooling zone outlet 104. By guiding in an S-shape at 110, the plating liquid 107 is turned obliquely from horizontal to oblique as shown by the arrow.
In this way, a large amount of metal-plated steel sheet is produced by immersion in a steel sheet.
【０００３】近年、メッキ液１０７を温め、ある程度高
温の鋼帯を浸漬することでメッキの密着性を高める運転
方法が採用されつつある。この結果、メッキ液１０７の
上表面から金属蒸気若しくは煙（以下「ヒューム」と記
す。）が立ち昇り、その一部がスナウト１０５を介して
連続炉１０１に侵入し、冷却帯１０５の冷たい壁（天
井、側壁）に接触して凝固し、固化し、堆積する現象が
顕著となってきた。この堆積物をアッシュ（灰）と言
う。In recent years, an operation method has been adopted in which the plating solution 107 is heated and a steel strip having a relatively high temperature is immersed to improve the adhesion of plating. As a result, metal vapor or smoke (hereinafter, referred to as “fume”) rises from the upper surface of the plating solution 107, and a part thereof enters the continuous furnace 101 through the snout 105, and the cold wall (cooling zone) of the cooling zone 105. The phenomenon of solidification, solidification, and deposition in contact with the ceiling and side walls) has become remarkable. This deposit is called ash.
【０００４】このアッシュは少量であれば問題無いが、
ある程度以上堆積すると、連続炉の振動作用などで表面
から剥離し、この剥離したアッシュが鋼帯に載る。一
方、鋼帯に載ったアッシュは、第１出口ロール１０９に
は接触しないが、次の第２出口ロール１１０には直接接
触する。従って第２出口ロール１１０にアッシュが付着
したり、第２出口ロール１１０の押付け力でアッシュの
押し疵が鋼帯１１１に発生するという問題が発生する。There is no problem if this ash is a small amount,
When the deposits exceed a certain level, they are separated from the surface by the vibration action of the continuous furnace, and the separated ash is placed on the steel strip. On the other hand, the ash placed on the steel strip does not contact the first exit roll 109, but directly contacts the next second exit roll 110. Therefore, there arises a problem that ash adheres to the second exit roll 110, and a pressing flaw of the ash is generated on the steel strip 111 by the pressing force of the second exit roll 110.
【０００５】そこで、対策として、例えば特開平７−１
５７８５４号公報「溶融金属めっきのスナウト内清浄化
方法及び装置」を試みた。この公報の図１を次図で説明
する。ただし、符号は振り直した。図９は従来の溶融金
属メッキのスナウト内清浄化装置の要部原理図であり、
スナウト１０５内へ矢印，の如く立ち昇るヒューム
を、環流管１１３と吸引管１１４との間に形成した一種
のガスカーテンで矢印の如く強制排出するというもの
である。Therefore, as a countermeasure, for example, Japanese Unexamined Patent Publication No.
No. 57854, "Method and apparatus for cleaning hot-dip metal plating in a snout" was tried. FIG. 1 of this publication will be described with reference to the following figure. However, the signs have been re-assigned. FIG. 9 is a principle view of a main part of a conventional apparatus for cleaning a molten metal plating in a snout.
The fume rising into the snout 105 as indicated by an arrow is forcibly discharged as indicated by an arrow by a kind of gas curtain formed between the reflux pipe 113 and the suction pipe 114.
【０００６】[0006]
【発明が解決しようとする課題】しかし、前記環流管１
１３から吸引管１１４へ向うガスの流れを、強力にしな
いとヒューム遮断効果が十分に得られないことが分かっ
た。ガスの流れを強力にすべくガスの流量及び流速を高
めると、メッキ液１０７の上表面が波打ち、メッキの付
着にばらつきが出るという課題が発生した。また、大量
のガスを流すために大容量の送風機が必要となり、機器
の費用が嵩むばかりでなく、電力費などのランニングコ
ストも嵩み、その見直しが必要となった。そこで、本発
明の目的はメッキ液の液面を乱すこと無く、且つ小さな
ランニングコストでアッシュの押し疵対策を講じること
のできる技術を提供することにある。However, the reflux pipe 1
It has been found that the fume blocking effect cannot be sufficiently obtained unless the flow of gas from 13 to the suction pipe 114 is made strong. When the flow rate and the gas flow rate of the gas are increased in order to increase the gas flow, the upper surface of the plating solution 107 is wavy, causing a problem that the adhesion of the plating varies. In addition, a large-capacity blower is required to flow a large amount of gas, which not only increases the cost of the equipment but also increases the running cost such as the power cost, which requires a review. Accordingly, an object of the present invention is to provide a technique capable of taking measures against ash pressing flaws without disturbing the level of a plating solution and at a small running cost.
【０００７】[0007]
【課題を解決するための手段】上記課題を解決するため
に請求項１は、加熱帯と冷却帯とを備えた横型連続炉の
冷却帯出口に第１出口ロール及び第２出口ロールを順に
配置し、冷却帯出口から下向き筒状のスナウトを延ば
し、このスナウトの下端を溶融金属メッキ槽のメッキ液
へ差込み、連続炉で熱処理した鋼帯を前記第１出口ロー
ル及び第２出口ロールでＳ字状に案内しつつ、水平から
斜め下へ向きを変えさせた後にメッキ液に浸漬させる形
式の溶融金属メッキラインにおいて、第１出口ロールで
向きを変える直前の鋼帯の上面に連続炉の外から供給し
た不活性ガスを吹きつけ且つこの吹きつけ方向が鋼帯の
上流側に指向するクリーニングノズルを、冷却帯出口に
設けたことを特徴とする。請求項２では、クリーニング
ノズルのノズル角度は、鋼帯の中心線に対して１０〜８
５゜をなすように設定したことを特徴とする。 According to a first aspect of the present invention, there is provided a horizontal continuous furnace having a heating zone and a cooling zone. Then, a downward cylindrical snout is extended from the cooling zone outlet, the lower end of the snout is inserted into the plating solution of the molten metal plating tank, and the steel strip heat-treated in the continuous furnace is S-shaped by the first and second outlet rolls. In a molten metal plating line of the type in which the direction is changed from horizontal to diagonally downward and then immersed in the plating solution, the upper surface of the steel strip immediately before changing the direction by the first exit roll is placed outside the continuous furnace. Supply
A cleaning nozzle for blowing the inert gas and directing the blowing direction to the upstream side of the steel strip at the outlet of the cooling zone. In claim 2, cleaning
The nozzle angle of the nozzle is 10 to 8 with respect to the center line of the steel strip.
The angle is set to 5 °.
【０００８】請求項１では、冷却帯の壁から剥離して鋼
帯に載ったアッシュを、クリーニングノズルから噴射し
た不活性ガスで吹き飛ばして少なくとも鋼帯上面からは
除去する。アッシュの無い鋼帯を第１・第２出口ロール
に巻き付けるわけであるから、鋼帯に疵がつく心配はな
い。冷却帯に壁に付着したアッシュのうち過飽和した分
だけ落下するため、鋼帯に載るアッシュの量はそれほど
多くない。少量のアッシュを吹き飛ばすだけであるから
不活性ガスの必要量は、少量で済み、吹込みによりメッ
キ液面を乱す心配はなく、安定したメッキが施せる。と
ころで、クリーニングノズルのノズル角度が０゜、即ち
ノズルをラインと平行にしたときには、鋼帯上のアッシ
ュをせき止めるだけでエッジから落下させる作用が乏し
くなる。同ノズル角度が９０゜にすると、鋼帯に直角に
ブローすることになりエッジからの落下は良好である。
しかし、ブロー面積が狭くなるため、アッシュが十分に
落ちないうちに、鋼帯が過ぎてしまう。そこで、請求項
２ではノズル角度を１０〜８５゜にすることで、十分な
量のアッシュを確実に鋼帯から落下させ得るようにし
た。 According to the first aspect, the ash separated from the wall of the cooling zone and placed on the steel strip is blown off by an inert gas jetted from a cleaning nozzle, and is removed at least from the upper surface of the steel strip. Since the steel strip without ash is wound around the first and second exit rolls, there is no fear that the steel strip is scratched. The amount of ash on the steel strip is not so large because it falls by the supersaturated amount of the ash attached to the wall in the cooling zone. Since only a small amount of ash is blown off, only a small amount of inert gas is required, and there is no risk of disturbing the plating liquid surface due to the blowing, and stable plating can be performed. When
At this time, the nozzle angle of the cleaning nozzle is 0 °, that is,
When the nozzle is parallel to the line,
The effect of dropping from the edge is only poor
It becomes. When the nozzle angle is 90 °, it is perpendicular to the steel strip.
It will blow and fall from the edge is good.
However, because the blow area is small, ash is sufficient
Before it falls, the steel strip passes. Therefore, the claim
In No. 2, setting the nozzle angle to 10 to 85 ° is sufficient
To ensure that a quantity of ash can fall from the strip.
Was.
【０００９】[0009]
【発明の実施の形態】本発明の実施の形態を添付図に基
づいて以下に説明する。図１は本発明に係るクリーニン
グノズルを備えた冷却帯出口の側面断面図であり、横型
連続炉１の冷却帯出口２に第１出口ロール３及び第２出
口ロール４を上下に順に配置し、冷却帯出口２から下向
き筒状のスナウト５を延ばし、このスナウト５の下端を
溶融金属メッキ槽のメッキ液６へ差込み、連続炉で熱処
理した鋼帯７を第１出口ロール３及び第２出口ロール４
でＳ字状に案内しつつ、水平から斜め下へ向きを変えさ
せた後にメッキ液６に浸漬させる形式の溶融金属メッキ
ラインであり、第１出口ロール３で向きを変える直前の
鋼帯７の上面に不活性ガスを吹きつけ且つこの吹きつけ
方向が鋼帯７の上流側に指向するクリーニングノズル１
０を、冷却帯出口２に設けたことを特徴とする。Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a side cross-sectional view of a cooling zone outlet provided with a cleaning nozzle according to the present invention, in which a first outlet roll 3 and a second outlet roll 4 are arranged vertically in a cooling zone outlet 2 of a horizontal continuous furnace 1, A downwardly extending cylindrical snout 5 is extended from the cooling zone outlet 2, the lower end of the snout 5 is inserted into the plating solution 6 of the molten metal plating tank, and the steel strip 7 heat-treated in the continuous furnace is subjected to the first outlet roll 3 and the second outlet roll. 4
This is a molten metal plating line in which the direction is changed from horizontal to diagonally downward while being guided in an S-shape, and then immersed in the plating solution 6. Cleaning nozzle 1 which blows an inert gas onto the upper surface and the blowing direction is directed to the upstream side of steel strip 7
0 is provided at the cooling zone outlet 2.
【００１０】このクリーニングノズル１０へは、不活性
ガス容器１１の不活性ガスを減圧弁１２で調圧し、オリ
フィス１３で流量を測り、流量制御弁１４で流量を制御
したものを供給する。不活性ガスは、窒素ガス又は窒素
−水素混合ガスが適当である。１５はコントローラであ
り、外部信号若しくは内蔵制御ロジックに基づいて、流
量を決定し、流量制御弁１４の開度を制御する。この流
量制御のフィードバックはオリフィス１３で行なう。The cleaning nozzle 10 is supplied with an inert gas in an inert gas container 11 whose pressure is regulated by a pressure reducing valve 12, whose flow rate is measured by an orifice 13, and whose flow rate is controlled by a flow control valve 14. As the inert gas, a nitrogen gas or a nitrogen-hydrogen mixed gas is appropriate. A controller 15 determines the flow rate based on an external signal or a built-in control logic and controls the opening of the flow control valve 14. The feedback of the flow control is performed by the orifice 13.
【００１１】図２は本発明に係るクリーニングノズルを
備えた冷却帯出口の平面断面図であり、クリーニングノ
ズル１０，１０は、鋼帯７の幅に応じて１本又は複数本
設ける。１６はヘッダ、１７，１７は手動弁である。こ
のようなクリーニングノズル１０，１０から噴射した不
活性ガスで、鋼板７上に載ったアッシュ１９・・・（・・・は
複数を示す。以下同様。）を吹き飛ばす。FIG. 2 is a plan sectional view of a cooling zone outlet provided with a cleaning nozzle according to the present invention. One or more cleaning nozzles 10 are provided according to the width of the steel strip 7. Reference numeral 16 denotes a header, and reference numerals 17 and 17 denote manual valves. The ash 19... (... Indicates a plurality of ashes) placed on the steel plate 7 is blown off by the inert gas injected from the cleaning nozzles 10 and 10.
【００１２】仮に、アッシュを吹き飛ばさないとすれ
ば、アッシュ１９は、鋼帯７の上面に載っているため、
第１出口ロール３に接触する心配はない。しかし、図１
において第２出口ロール４に接触し、種々の問題をおこ
す。そこで、不活性ガスでクリーニングすれば、アッシ
ュは第２出口ロール４に達する心配はない。Assuming that the ash is not blown off, the ash 19 is placed on the upper surface of the steel strip 7.
There is no need to worry about contact with the first exit roll 3. However, FIG.
At contact with the second outlet roll 4, causing various problems. Therefore, if cleaning is performed with an inert gas, the ash does not need to reach the second outlet roll 4.
【００１３】なお、図示したとおりに、第１出口ロール
３の真上の点Ａを狙って鋼帯７を、鋼帯７の移動方向の
逆方向にブローするのは次の理由による。冷却帯２の
壁、特に天井２ａに付着したアッシュ１９・・・が問題と
なる。例えば図１の点Ｂでブローしたとすれば、点Ｂか
ら点Ａまでの間で新たなアッシュ１９が清掃済鋼帯７に
載る可能性がある。また、第１出口ローラ３と第２出口
ローラ４の中間点である点Ｃでブローするとすれば、鋼
帯７がほぼ鉛直であるから少量の不活性ガスで効果的に
クリーニングできそうに見える。しかし、除去したアッ
シュ１９が落下して第２出口ローラ４と鋼帯７との間に
侵入する可能性がある。従って、点Ｂ及び点Ｃではな
く、第１出口ローラ３直上の点Ａ（若しくはその近傍）
でなけれならない。As shown in the drawing, the steel strip 7 is blown in the direction opposite to the moving direction of the steel strip 7 aiming at the point A just above the first outlet roll 3 for the following reason. The ash 19 attached to the wall of the cooling zone 2, especially the ceiling 2a becomes a problem. For example, if blowing is performed at the point B in FIG. 1, there is a possibility that a new ash 19 will be placed on the cleaned steel strip 7 from the point B to the point A. Further, if the blow is performed at the point C, which is an intermediate point between the first exit roller 3 and the second exit roller 4, it seems that the steel strip 7 is almost vertical and can be effectively cleaned with a small amount of inert gas. However, the removed ash 19 may fall and enter between the second exit roller 4 and the steel strip 7. Therefore, not point B and point C, but point A (or its vicinity) immediately above the first exit roller 3
Must be.
【００１４】次に、クリーニングガスの種類、温度、噴
射圧力、噴射角度について説明する。 （１）クリーニングガスの種類 図３はクリーニングのためのガスの比較グラフであり、
縦軸は処理鋼帯に発生した単位面積（ｍ2）当りの酸化
鉄の量（ｇ）であり、窒素ガスであれば酸化鉄の量はほ
ぼ０であり、窒素−水素混合ガスもほぼ０であったが、
圧縮空気を使用した場合には２５ｇ／ｍ2もの酸化鉄が
発生し、メッキ不良の要因となった。従って、クリーニ
ングガスは、不活性ガスを使う必要があり、入手容易な
窒素ガス、若しくは窒素−水素混合ガスが好適である。Next, the type, temperature, injection pressure and injection angle of the cleaning gas will be described. (1) Type of cleaning gas FIG. 3 is a comparison graph of gas for cleaning,
The vertical axis represents the amount (g) of iron oxide per unit area (m 2 ) generated in the treated steel strip. In the case of nitrogen gas, the amount of iron oxide is almost zero, and the nitrogen-hydrogen mixed gas is almost zero. Was
When compressed air was used, as much as 25 g / m 2 of iron oxide was generated, which was a cause of plating failure. Therefore, it is necessary to use an inert gas as the cleaning gas, and a readily available nitrogen gas or a mixed gas of nitrogen and hydrogen is preferable.
【００１５】（２）クリーニングガスの温度 冷却帯出口での鋼帯の温度は３００〜６００℃である。
調査の結果、クリーニングガスの温度が（鋼帯の温度＋
２５０℃）を超えると鋼帯表面の温度バランスが崩れて
メッキ不良が認められ、また、（鋼帯の温度−２５０
℃）でもメッキ不良が認められた。従って、クリーニン
グガスの温度は、（鋼帯の温度±２５０℃）の範囲に保
つ必要がある。(2) Temperature of cleaning gas The temperature of the steel strip at the cooling zone outlet is 300 to 600 ° C.
As a result of the investigation, the temperature of the cleaning gas was (temperature of steel strip +
If the temperature exceeds 250 ° C., the temperature balance on the surface of the steel strip is lost, and poor plating is observed.
° C), poor plating was observed. Therefore, it is necessary to keep the temperature of the cleaning gas in the range of (steel strip temperature ± 250 ° C.).
【００１６】（３）クリーニングガスの噴射圧力 図４はガス噴射圧力と連続焼鈍炉内の冷却帯出口圧力と
の関係を示すグラフであり、横軸はクリーニングノズル
の噴射圧力、縦軸は冷却帯出口圧力を示す。ノズルの口
径は４０ｍｍであり、０．５〜４ｋｇ／ｃｍ2（ノズル
圧力）で不活性ガスを噴射したところ、冷却帯出口での
圧力は５．０ｋｇ／ｃｍ2であり、メッキに不良は出な
かった。５〜６ｋｇ／ｃｍ2（ノズル圧力）で不活性ガ
スを噴射したところ、冷却帯出口での圧力は５．０ｋｇ
／ｃｍ2であり、メッキに不良は出なかった。従って、
ノズルの噴射圧力はメッキ品質に影響しないことが分か
った。(3) Cleaning Gas Injection Pressure FIG. 4 is a graph showing the relationship between the gas injection pressure and the cooling zone outlet pressure in the continuous annealing furnace. The horizontal axis indicates the cleaning nozzle injection pressure, and the vertical axis indicates the cooling zone. Indicates the outlet pressure. When the nozzle diameter is 40 mm and an inert gas is injected at 0.5 to 4 kg / cm 2 (nozzle pressure), the pressure at the outlet of the cooling zone is 5.0 kg / cm 2 , and there is no defective plating. Did not. When the inert gas was injected at 5 to 6 kg / cm 2 (nozzle pressure), the pressure at the outlet of the cooling zone was 5.0 kg.
/ Cm 2 , and there was no failure in plating. Therefore,
It was found that the injection pressure of the nozzle did not affect the plating quality.
【００１７】（４）ノズルの角度 図５はノズル角度とアッシュ残存量との関係を示すグラ
フであり、（ａ）に示す通りに白抜き矢印の如く進む鋼
帯に、逆向きに且つ中心線Ｌに対して角度θとしたクリ
ーニングノズル１０，１０でクリーニングした。（ｂ）
は横軸がノズル角度θ、縦軸は鋼帯上に残ったアッシュ
の量である。θ＝０、即ちノズルをラインと平行にした
ときには、鋼帯上のアッシュをせき止めるだけでエッジ
から落下させる作用が乏しいため、１０ｇ／ｍ2ものア
ッシュが残存していた。ノズル角度θを１０゜，３０゜
とすると、アッシュ残存は４ｇ／ｍ2，２ｇ／ｍ2と減少
した。(4) Nozzle Angle FIG. 5 is a graph showing the relationship between the nozzle angle and the remaining amount of ash. As shown in FIG. Cleaning was performed with the cleaning nozzles 10 and 10 at an angle θ with respect to L. (B)
The horizontal axis indicates the nozzle angle θ, and the vertical axis indicates the amount of ash remaining on the steel strip. When θ = 0, that is, when the nozzle was in parallel with the line, only 10 g / m 2 of ash remained because only the ash on the steel strip was blocked and the effect of dropping from the edge was poor. Assuming that the nozzle angle θ is 10 ° or 30 °, the remaining ash decreased to 4 g / m 2 or 2 g / m 2 .
【００１８】更にノズル角度θを４０゜，６０゜，８０
とすると、アッシュ残存は１ｇ／ｍ2まで減少した。ノ
ズル角度θを８５゜，９０゜にすると、アッシュ残存は
３ｇ／ｍ2，８ｇ／ｍ2に増加した。θ＝９０゜は鋼帯に
直角にブローするわけであるから、エッジからの落下は
良好である。しかし、ブロー面積が狭くなるため、アッ
シュが十分に落ちないうちに、鋼帯が過ぎてしまうため
である。アッシュの許容残存を４ｇ／ｍ2とすれば、ノ
ズル角度θは１０〜８５゜の範囲にあればよく、好まし
くはノズル角度θを４０〜８０゜の範囲にすればよい。Further, the nozzle angle θ is set to 40 °, 60 °, 80
Then, the ash residue was reduced to 1 g / m 2 . When the nozzle angle θ was 85 ° or 90 °, the ash residue increased to 3 g / m 2 or 8 g / m 2 . Since θ = 90 ° blows at right angles to the steel strip, falling from the edge is good. However, since the blow area becomes narrow, the steel strip passes before the ash is sufficiently dropped. Assuming that the allowable remaining amount of the ash is 4 g / m 2 , the nozzle angle θ may be in the range of 10 to 85 °, preferably the nozzle angle θ is in the range of 40 to 80 °.
【００１９】[0019]
【実施例】本発明に係る実施例を次に説明する。 共通条件： 鋼帯の厚さ １．２ ｍｍ 鋼帯の幅 １１５０ ｍｍ 鋼帯の送り速度 ８４ ｍ／ｍｉｎ 鋼帯の温度 ４７０℃（冷却帯出口）Embodiments of the present invention will be described below. Common conditions: Steel strip thickness 1.2 mm Steel strip width 1150 mm Steel strip feed rate 84 m / min Steel strip temperature 470 ° C (cooling zone outlet)
【００２０】実施例の条件： クリーニングノズル 有り ガスの種類 窒素ガス ノズル圧力 ２．０ｋｇ／ｃｍ2 ノズル口径 ４０ ｍｍ ノズル角度θ ４５゜ ガスの温度 ２５０℃Conditions of the embodiment: Cleaning nozzle Yes Gas type Nitrogen gas Nozzle pressure 2.0 kg / cm 2 Nozzle diameter 40 mm Nozzle angle θ 45 ° Gas temperature 250 ° C.
【００２１】比較例の条件： クリーニングノズル 無しConditions of Comparative Example: No cleaning nozzle
【００２２】図６はアッシュ残存量に関する比較グラフ
であり、比較例では１５ｇ／ｍ2ものアッシュが残存し
ていた。これに対して実施例では１〜２ｇ／ｍ2のアッ
シュ残存であった。FIG. 6 is a comparative graph regarding the remaining amount of ash. In the comparative example, as much as 15 g / m 2 of ash remained. On the other hand, in the example, 1-2 g / m 2 of ash remained.
【００２３】図７は鋼帯の押込み疵発生量に関する比較
グラフであり、比較例では約５０ｔｏｎ／月もの欠陥が
発生した。これに対して実施例では約２ｔｏｎ／月の欠
陥に留った。従って、本発明のクリーニングノズルは極
めて有益である。FIG. 7 is a comparison graph regarding the amount of indentation flaws generated in the steel strip. In the comparative example, a defect of about 50 tons / month was generated. In contrast, in the example, the defect was about 2 ton / month. Therefore, the cleaning nozzle of the present invention is extremely useful.
【００２４】尚、図１ではクリーニングノズル１０は鋼
帯の上面より僅かに上方に設けたが、取付け位置をもう
少し高くして水平から僅かに下向きに噴射させるように
してもよい。取付け位置は、あまり高くすると水平モー
メントが減少するため、例えば第１出口ロール３の径の
１．０倍を超えない寸法に留める。また、クリーニング
ノズル１０は偏平ノズル、多孔パイプであってもよく、
要はアッシュを吹き飛ばすための不活性ガスを方向性を
もって噴射するものであればよい。さらに、本発明の適
用できる溶融金属メッキは、溶融亜鉛メッキ、溶融アル
ミニウムメッキ、溶融すずメッキである。In FIG. 1, the cleaning nozzle 10 is provided slightly above the upper surface of the steel strip. However, the mounting position may be made slightly higher so that the nozzle is jetted slightly downward from the horizontal. If the mounting position is too high, the horizontal moment decreases, so that the mounting position is set to, for example, a size not exceeding 1.0 times the diameter of the first outlet roll 3. Further, the cleaning nozzle 10 may be a flat nozzle or a perforated pipe,
In short, it is only necessary that the inert gas for blowing off the ash be jetted in a directional manner. Further, hot-dip metal plating to which the present invention can be applied is hot-dip galvanizing, hot-dip aluminum plating, and hot-dip tin plating.
【００２５】[0025]
【発明の効果】本発明は上記構成により次の効果を発揮
する。請求項１は、加熱帯と冷却帯とを備えた横型連続
炉の冷却帯出口に第１出口ロール及び第２出口ロールを
順に配置し、冷却帯出口から下向き筒状のスナウトを延
ばし、このスナウトの下端を溶融金属メッキ槽のメッキ
液へ差込み、連続炉で熱処理した鋼帯を前記第１出口ロ
ール及び第２出口ロールでＳ字状に案内しつつ、水平か
ら斜め下へ向きを変えさせた後にメッキ液に浸漬させる
形式の溶融金属メッキラインにおいて、第１出口ロール
で向きを変える直前の鋼帯の上面に連続炉の外から供給
した不活性ガスを吹きつけ且つこの吹きつけ方向が鋼帯
の上流側に指向するクリーニングノズルを、冷却帯出口
に設けたことを特徴とする。請求項２では、クリーニン
グノズルのノズル角度は、鋼帯の中心線に対して１０〜
８５゜をなすように設定したことを特徴とする。 According to the present invention, the following effects are exhibited by the above configuration. A first outlet roll and a second outlet roll are sequentially disposed at a cooling zone outlet of a horizontal continuous furnace having a heating zone and a cooling zone, and a downward cylindrical snout is extended from the cooling zone outlet. Was inserted into the plating solution of the molten metal plating tank, and the steel strip heat-treated in the continuous furnace was turned obliquely downward from horizontal while being guided in an S-shape by the first and second exit rolls. In a molten metal plating line that is immersed in a plating solution later, supply from outside the continuous furnace to the upper surface of the steel strip immediately before changing the direction with the first exit roll
And blowing the inert gas cleaning nozzle this the blowing direction is directed to the upstream side of the steel strip, characterized in that provided in the cooling zone outlet. In claim 2, the cleaning
The nozzle angle of the nozzle is 10 to the center line of the steel strip.
The angle is set to 85 °.
【００２６】請求項１では、冷却帯の壁から剥離して鋼
帯に載ったアッシュを、クリーニングノズルから噴射し
た不活性ガスで吹き飛ばして少なくとも鋼帯上面からは
除去する。アッシュの無い鋼帯を第１・第２出口ロール
に巻き付けるわけであるから、鋼帯に疵がつく心配はな
い。従って、品質の良いメッキ鋼帯を製造することがで
きるとともに、第２出口ロールの寿命を大幅に延ばすこ
とができる。請求項２によれば、ノズル角度を１０〜８
５゜にしたので、十分な量のアッシュを確実に鋼帯から
落下させ得る。 According to the first aspect, the ash separated from the wall of the cooling zone and placed on the steel strip is blown off with an inert gas injected from a cleaning nozzle, and is removed at least from the upper surface of the steel strip. Since the steel strip without ash is wound around the first and second exit rolls, there is no fear that the steel strip is scratched. Therefore, a plated steel strip of good quality can be manufactured, and the service life of the second outlet roll can be greatly extended. According to claim 2, the nozzle angle is 10 to 8
5mm, so make sure enough ash from steel strip
Can be dropped.
【図１】本発明に係るクリーニングノズルを備えた冷却
帯出口の側面断面図FIG. 1 is a side sectional view of a cooling zone outlet provided with a cleaning nozzle according to the present invention.
【図２】本発明に係るクリーニングノズルを備えた冷却
帯出口の平面断面図FIG. 2 is a plan sectional view of a cooling zone outlet provided with a cleaning nozzle according to the present invention.
【図３】クリーニングのためのガスの比較グラフFIG. 3 is a comparison graph of gas for cleaning.
【図４】ガス噴射圧力と連続焼鈍炉内の冷却帯出口圧力
との関係を示すグラフFIG. 4 is a graph showing the relationship between gas injection pressure and cooling zone outlet pressure in a continuous annealing furnace.
【図５】ノズル角度とアッシュ残存量との関係を示すグ
ラフFIG. 5 is a graph showing the relationship between the nozzle angle and the remaining amount of ash.
【図６】アッシュ残存量に関する比較グラフFIG. 6 is a comparison graph regarding the remaining amount of ash.
【図７】鋼帯の押込み疵発生量に関する比較グラフFIG. 7 is a comparison graph regarding the amount of indentation flaws generated in a steel strip.
【図８】従来の溶融金属メッキラインの原理図FIG. 8 is a principle diagram of a conventional hot-dip metal plating line.
【図９】従来の溶融金属メッキのスナウト内清浄化装置
の要部原理図FIG. 9 is a principle view of a main part of a conventional apparatus for cleaning a molten metal plating in a snout.
１…横型連続炉、２…冷却帯出口、３…第１出口ロー
ル、４…第２出口ロール、５…スナウト、６…メッキ
液、７…鋼帯、１０…クリーニングノズル、１１…不活
性ガス容器、１９…アッシュ、１０２…加熱帯、１０３
…冷却帯。DESCRIPTION OF SYMBOLS 1 ... Horizontal continuous furnace, 2 ... Cooling zone outlet, 3 ... First outlet roll, 4 ... Second outlet roll, 5 ... Snout, 6 ... Plating solution, 7 ... Steel strip, 10 ... Cleaning nozzle, 11 ... Inert gas Container, 19: Ash, 102: Heating zone, 103
... cooling zone.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 宮崎 章 茨城県鹿嶋市大字光３番地 住友金属工 業株式会社鹿島製鉄所内 (72)発明者 小畑 正登 茨城県鹿嶋市大字光３番地 住友金属工 業株式会社鹿島製鉄所内 (56)参考文献 特開 平７−157855（ＪＰ，Ａ) 特開 平９−143651（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C23C 2/00 - 2/40 ──────────────────────────────────────────────────の Continuing on the front page (72) Akira Miyazaki, 3, Oaza Hikari, Kashima City, Ibaraki Prefecture Sumitomo Metal Industries, Ltd. Kashima Works, Ltd. Kashima Works, Ltd. (56) References JP-A-7-157855 (JP, A) JP-A-9-143651 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) C23C 2 / 00-2/40
Claims (2)
冷却帯出口に第１出口ロール及び第２出口ロールを順に
配置し、冷却帯出口から下向き筒状のスナウトを延ば
し、このスナウトの下端を溶融金属メッキ槽のメッキ液
へ差込み、前記連続炉で熱処理した鋼帯を前記第１出口
ロール及び第２出口ロールでＳ字状に案内しつつ、水平
から斜め下へ向きを変えさせた後にメッキ液に浸漬させ
る形式の溶融金属メッキラインにおいて、第１出口ロー
ルで向きを変える直前の鋼帯の上面に連続炉の外から供
給した不活性ガスを吹きつけ且つこの吹きつけ方向が鋼
帯の上流側に指向するクリーニングノズルを、前記冷却
帯出口に設けたことを特徴とする溶融金属メッキライン
のクリーニングノズル配置構造。A first outlet roll and a second outlet roll are sequentially disposed at a cooling zone outlet of a horizontal continuous furnace provided with a heating zone and a cooling zone, and a downward cylindrical snout is extended from the cooling zone outlet. Into the plating solution of the molten metal plating tank, and while the steel strip heat-treated in the continuous furnace is guided in an S-shape by the first exit roll and the second exit roll, the steel strip is turned obliquely downward from horizontal. in the form of molten metal plating line to be immersed in the plating solution after, provided from outside the continuous furnace to the upper surface of the steel strip just before changing the direction in the first exit rollers
A cleaning nozzle arrangement structure for a molten metal plating line, characterized in that a cleaning nozzle that blows the supplied inert gas and the blowing direction is directed to the upstream side of the steel strip is provided at the cooling zone outlet.
は、鋼帯の中心線に対して１０〜８５゜をなすように設Shall be set at 10-85 ° to the center line of the steel strip.
定したことを特徴とする請求項１記載の溶融金属メッキ2. The hot-dip metal plating according to claim 1, wherein:
ラインのクリーニングノズル配置構造。Line cleaning nozzle arrangement structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19605097A JP3186654B2 (en) | 1997-07-22 | 1997-07-22 | Cleaning nozzle arrangement structure for molten metal plating line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19605097A JP3186654B2 (en) | 1997-07-22 | 1997-07-22 | Cleaning nozzle arrangement structure for molten metal plating line |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1143752A JPH1143752A (en) | 1999-02-16 |
| JP3186654B2 true JP3186654B2 (en) | 2001-07-11 |
Family
ID=16351371
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19605097A Expired - Fee Related JP3186654B2 (en) | 1997-07-22 | 1997-07-22 | Cleaning nozzle arrangement structure for molten metal plating line |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3186654B2 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102127727B (en) * | 2011-04-22 | 2015-02-04 | 上海东新冶金技术工程有限公司 | Grate for hot galvanizing |
| KR101353669B1 (en) * | 2011-12-26 | 2014-01-21 | 주식회사 포스코 | Apparatus for dross reducing galvanizing steel sheet and method for the same |
| CN104947019B (en) * | 2014-08-08 | 2017-09-12 | 上海东新冶金技术工程有限公司 | Stove nose and its application method for the detachable scum pipe of galvanizing band |
| CN106427594A (en) * | 2016-11-02 | 2017-02-22 | 天津市松正电动汽车技术股份有限公司 | Gas circuit structure of dual-source trackless pure electric bus |
| CN106541928A (en) * | 2016-11-02 | 2017-03-29 | 天津市松正电动汽车技术股份有限公司 | A kind of double source trolleybus gas circuit structure |
| JP7161292B2 (en) * | 2018-02-02 | 2022-10-26 | 日鉄鋼板株式会社 | Continuous hot dip metal plating apparatus and continuous hot dip metal plating method |
| IT202000016012A1 (en) * | 2020-07-02 | 2022-01-02 | Danieli Off Mecc | EQUIPMENT FOR CORRECTING THE FLATNESS OF A METALLIC STRIP AND RELATED CORRECTION METHOD |
-
1997
- 1997-07-22 JP JP19605097A patent/JP3186654B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH1143752A (en) | 1999-02-16 |
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