JP2014065950A - Discharge device for foreign substance in snout - Google Patents

Discharge device for foreign substance in snout Download PDF

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JP2014065950A
JP2014065950A JP2012213293A JP2012213293A JP2014065950A JP 2014065950 A JP2014065950 A JP 2014065950A JP 2012213293 A JP2012213293 A JP 2012213293A JP 2012213293 A JP2012213293 A JP 2012213293A JP 2014065950 A JP2014065950 A JP 2014065950A
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snout
screw
foreign matter
plating bath
discharge
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JP6160051B2 (en
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Keisuke Iwane
啓介 岩根
Masanobu Fujisawa
政伸 藤沢
Tatsuya Fukushima
竜也 福島
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JFE Steel Corp
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JFE Steel Corp
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Priority to JP2012213293A priority Critical patent/JP6160051B2/en
Priority to CN201380050823.9A priority patent/CN104685090B/en
Priority to DE112013004765.9T priority patent/DE112013004765T5/en
Priority to IN1670DEN2015 priority patent/IN2015DN01670A/en
Priority to PCT/JP2013/005650 priority patent/WO2014050082A1/en
Priority to KR1020157009435A priority patent/KR20150053808A/en
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/003—Apparatus
    • C23C2/0038—Apparatus characterised by the pre-treatment chambers located immediately upstream of the bath or occurring locally before the dipping process
    • C23C2/004—Snouts
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/325—Processes or devices for cleaning the bath

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
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  • Organic Chemistry (AREA)
  • Coating With Molten Metal (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a discharge device for foreign substance in a snout, which does not cause clogging in a transfer pipe and has a high discharge efficiency.SOLUTION: In an apparatus for continuously performing hot-dip metal plating of a steel strip S, when foreign substance generated in a snout 2 of which tip is dipped in a plating bath is discharged with a discharge device for foreign substance in a snout, the discharge device for foreign substance in a snout includes: a transportation pipe 6 including a pipe 6a on a suction side, which is disposed in the snout and sucks foreign substance in the snout, and a pipe 6b on a discharge side, which is disposed outside of the snout and discharges the foreign substance in the snout. A screw 7 is inserted into the pipe 6b on the discharge side. The screw 7 is disposed at a slant to the surface of the plating bath.

Description

本発明は、連続溶融金属めっき設備のスナウト内異物排出装置に関する。   The present invention relates to a device for discharging foreign matter in a snout of a continuous molten metal plating facility.

連続溶融金属めっき設備、例えば連続溶融亜鉛めっき設備においては、一般に焼鈍炉で熱処理を行った鋼帯を大気に触れないようにするため、焼鈍炉とめっき浴間はスナウトを介して接続されており、内部は還元性ガスで満たされている。スナウトを介してめっき浴中に搬入された鋼帯は、めっき浴中のシンクロールによって上方に転換されてめっき浴を出た後、ガスワイピングによって溶融亜鉛が吹き落とされ、所定のめっき厚さに調整される。   In continuous molten metal plating equipment, such as continuous hot dip galvanizing equipment, the annealing furnace and the plating bath are generally connected via a snout so that the steel strip that has been heat-treated in an annealing furnace is not exposed to the atmosphere. The interior is filled with reducing gas. The steel strip carried into the plating bath via the snout is converted upward by the sink roll in the plating bath and exits the plating bath, and then the molten zinc is blown off by gas wiping to a predetermined plating thickness. Adjusted.

このような連続溶融金属めっき設備において、めっき浴中の異物が鋼帯に付着し品質欠陥を生じることがある。このような異物としては、ドロスやアッシュと称される異物がある。ドロスとは、鋼帯からめっき浴中に溶出したＦｅと、めっき密着性向上を目的にめっき浴中に添加されているＡｌとが反応して生じるＦｅ２Ａｌ５であり、トップドロスとも称される。ドロスが鋼帯に付着したままプレス加工等を行うと、金型の破損や押し疵の原因となる。アッシュは亜鉛ヒュームの固体であり、鋼帯に付着した状態でガスワイピングされると吹き飛ばされて不めっき部が発生する。 In such a continuous molten metal plating facility, foreign matter in the plating bath may adhere to the steel strip and cause a quality defect. Such foreign matter includes foreign matter called dross or ash. Dross is Fe 2 Al 5 produced by the reaction of Fe eluted from the steel strip into the plating bath and Al added to the plating bath for the purpose of improving plating adhesion, and is also referred to as top dross. The If pressing or the like is performed while the dross is attached to the steel strip, it may cause damage to the mold or pushing rivets. Ash is a solid of zinc fume. When gas wiping is performed while adhering to the steel strip, it is blown away and an unplated portion is generated.

また上記の異物以外にもめっき浴中の亜鉛が空気と反応して生じる酸化亜鉛（酸化ドロスとも称される。）があり、これら異物は鋼帯がめっき浴内に搬入される際のめっき浴の流れによってスナウト内に引き込まれ、スナウト内部にたまりやすくなる。   In addition to the above foreign matter, there is zinc oxide (also referred to as dross oxide) generated when zinc in the plating bath reacts with air, and these foreign matter is a plating bath when the steel strip is carried into the plating bath. It is drawn into the snout by the flow of, and tends to accumulate inside the snout.

そのため、スナウト内のめっき浴面のドロス等の異物を排出する方法や装置がこれまで考案されている。例えば、特許文献１には、スナウト内の浴面付近で鋼板の幅方向の一外側方に供給ノズルと、他外側方に吸い込みノズルを設置してそれぞれ移送管の他端に設けたポンプにより幅方向の流れを形成しドロスを吸い込み、ノズル近辺に集積させて排出除去される方法が提案されている。   Therefore, a method and an apparatus for discharging foreign matters such as dross on the plating bath surface in the snout have been devised so far. For example, in Patent Document 1, a supply nozzle and a suction nozzle are installed on the outer side in the width direction of the steel plate near the bath surface in the snout, and a pump provided at the other end of the transfer pipe is installed in the width direction. A method has been proposed in which a flow in a direction is formed, dross is sucked, and is collected in the vicinity of the nozzle to be discharged and removed.

一方、特許文献２には、ドロス等の異物を除去する方法としてスクリュー軸を用いた方法が提案されている。この装置は、スナウト内の浴面部に斜めに切った切り口の一部を浴面上に出した吸入口をＵ字パイプの一端に設け、他端内にパイプ他端側壁に形成した排出口から異物をスナウト外に排出する浴中スクリューを設けたものである。   On the other hand, Patent Document 2 proposes a method using a screw shaft as a method for removing foreign matters such as dross. This device is provided with a suction port, which is part of a cut surface obliquely cut in the bath surface portion in the snout, on the bath surface at one end of the U-shaped pipe, and from the discharge port formed in the other end side wall in the other end. A screw in the bath for discharging foreign matter out of the snout is provided.

特開平８−２６９６５９号公報JP-A-8-269659 登録実用新案第３００８３３１号公報Registered Utility Model No. 3008331

しかしこれらの方法では以下に挙げるような問題があった。特許文献１では使用するポンプの構造上ケーシングごとインペラを浴中に浸漬して使用する。インペラ等が溶融亜鉛による腐食と磨耗により損傷を受けた場合には部品の交換を行う必要があるが、ドロス等の堆積によってケーシングと移送管の接続部が覆われてしまい分解整備が困難となる問題があった。また、前記ポンプでは吐出口が狭小のためドロスが詰まり移送管が閉塞することで送液効率が低下してしまう問題があった。   However, these methods have the following problems. In Patent Document 1, the impeller is immersed in a bath and used together with the casing because of the structure of the pump used. If the impeller is damaged by molten zinc corrosion and wear, it is necessary to replace the parts. However, accumulation of dross covers the connection between the casing and the transfer pipe, making it difficult to disassemble and maintain. There was a problem. Moreover, since the discharge port is narrow in the pump, there is a problem that the liquid feeding efficiency is lowered because the dross is clogged and the transfer pipe is blocked.

特許文献２ではスクリューを浴面に対して垂直に設置した場合、移送管の水平部から垂直部への接続部にて圧力損失が大きく、ドロスを含む流れが滞留して移送管内壁に固着することで移送管の閉塞を生じる問題がある。また、めっき浴面に対し垂直にスクリューが設置されている場合、移送管水平部から吐出口までの距離が短くなり、設置できるスクリューの羽根枚数が少なく排出効率が低下してしまい、十分な流量が得られずドロスが固まりやすいという問題がある。   In Patent Document 2, when the screw is installed perpendicular to the bath surface, the pressure loss is large at the connecting portion from the horizontal portion to the vertical portion of the transfer pipe, and the flow containing dross stays and adheres to the inner wall of the transfer pipe. This causes a problem that the transfer pipe is blocked. In addition, when the screw is installed perpendicular to the plating bath surface, the distance from the horizontal part of the transfer pipe to the discharge port is shortened, the number of blades of the screw that can be installed is small, the discharge efficiency is lowered, and the flow rate is sufficient. There is a problem that dross tends to harden.

また、実際の保守整備の際には、めっき浴を含むポットをライン進行方向に対して水平に移動あるいは昇降させて作業を行うことが一般的である。その際、ポットを水平に移動させる場合には、排出ポンプ移送管水平部の下端がポット壁面と干渉しないようにするため、ポット上面の高さ以上に排出ポンプを昇降させる機構が必要である。また、ポットを昇降させる場合にも、スナウトおよび排出ポンプ移送管水平部の下端がポット壁面と干渉しないようにするための昇降量を確保する必要がある。いずれにせよ、排出ポンプ移送管をめっき浴に浸漬させて使用すると、こうした昇降量を大きく設計する必要があり、架構式構造が大きくなってしまうため、設備管理上または費用上好ましくない。また、移送管長を大きくすると、圧力損失が大きくなり排出効率が低下してしまう問題がある。このような理由から、昇降量を小さくし圧力損失を小さくするために、移送管の水平部を極力浴面に近づけ移送管長を小さくすることが必要である。   In actual maintenance, it is common to work by moving or raising and lowering the pot including the plating bath horizontally with respect to the line traveling direction. At that time, when the pot is moved horizontally, a mechanism for raising and lowering the discharge pump beyond the height of the upper surface of the pot is necessary so that the lower end of the horizontal portion of the discharge pump transfer pipe does not interfere with the pot wall surface. Also, when raising and lowering the pot, it is necessary to secure a raising and lowering amount for preventing the lower end of the snout and the discharge pump transfer pipe horizontal portion from interfering with the pot wall surface. In any case, if the discharge pump transfer pipe is immersed in the plating bath, it is necessary to design such a large amount of lifting, and the frame structure becomes large, which is not preferable in terms of facility management or cost. Further, when the transfer pipe length is increased, there is a problem that the pressure loss is increased and the discharge efficiency is lowered. For these reasons, it is necessary to reduce the length of the transfer pipe so that the horizontal portion of the transfer pipe is as close as possible to the bath surface in order to reduce the amount of elevation and pressure loss.

本発明は上記のような問題点に鑑み、移送管内の詰まりを生じず排出効率の高いスナウト内異物排出装置を提供することを目的とする。   In view of the above problems, an object of the present invention is to provide a snout foreign matter discharging apparatus having high discharge efficiency without causing clogging in a transfer pipe.

本発明者らは前記目的を達成するために鋭意検討を行った結果、スクリューを浴面に対して傾けて設置することを見出した。本発明の要旨は以下のとおりである。
［１］連続的に鋼帯を溶融金属めっきする設備において、先端部がめっき浴内に浸漬されたスナウトの内部に発生する異物をスナウト内異物排出装置で排出するに際し、
前記スナウト内異物排出装置は、前記スナウト内に配置されて前記スナウト内の異物を吸入する吸込側配管と、前記スナウト外に配置されて前記スナウト内の異物を排出する排出側配管とを備える移送管を有し、前記排出側配管内にはスクリューが挿入されており、前記スクリューはめっき浴面に対して傾斜して設置されていることを特徴とするスナウト内異物排出装置。
［２］前記スクリューの羽根および軸は耐食性材料で形成されているとともに、肉盛溶接加工を施されていることを特徴とする［１］に記載のスナウト内異物排出装置。
［３］前記スクリューはスクリュー軸駆動部を有し、前記スクリュー軸駆動部と前記排出側配管は、めっき浴外で接続されていることを特徴とする［１］または［２］に記載のスナウト内異物排出装置。 As a result of intensive studies to achieve the above object, the present inventors have found that the screw is installed inclined with respect to the bath surface. The gist of the present invention is as follows.
[1] In a facility for continuously metal-plating a steel strip, when the foreign matter generated inside the snout whose tip is immersed in the plating bath is discharged by the foreign matter discharge device in the snout,
The in-snout foreign matter discharging apparatus includes a suction side pipe that is disposed in the snout and sucks in the snout, and a discharge side pipe that is disposed outside the snout and discharges the foreign matter in the snout. A device for discharging foreign matter in a snout, comprising a pipe, wherein a screw is inserted into the discharge-side pipe, and the screw is installed inclined with respect to the plating bath surface.
[2] The in-snout foreign matter discharging apparatus according to [1], wherein the screw blade and the shaft are formed of a corrosion-resistant material and are subjected to overlay welding.
[3] The screw according to [1] or [2], wherein the screw has a screw shaft driving unit, and the screw shaft driving unit and the discharge side pipe are connected outside the plating bath. Internal foreign matter discharge device.

本発明では、スクリューを浴面に対して傾斜させて設置したので、浴面に対して垂直に設置する場合に比べて、移送管曲管部での圧力損失が小さい。また、スクリュー羽根の枚数をより多く設置できる。このため、異物の排出効率が上がり、移送管内に異物が固着しにくくなり、スナウト内異物排出装置を長期間に亘って使用することができる。   In the present invention, since the screw is installed to be inclined with respect to the bath surface, the pressure loss at the bent portion of the transfer pipe is small compared to the case where the screw is installed perpendicular to the bath surface. In addition, more screw blades can be installed. For this reason, the foreign matter discharge efficiency is increased, and the foreign matter is less likely to adhere to the transfer pipe, and the in-snout foreign matter discharge device can be used for a long period of time.

本発明のスナウト内異物排出装置の実施形態を示す断面図である。It is sectional drawing which shows embodiment of the foreign material discharge device in the snout of this invention.

図１は、本発明のスナウト内異物排出装置の実施形態を示す断面図である。図１に示されるように、連続溶融金属めっき設備において、めっき浴槽１の溶融金属内にはスナウト２が差し込まれており、スナウト２を介して鋼帯Ｓは連続的に溶融金属内に搬入される。スナウト２を介してめっき浴槽１中に搬入された鋼帯Ｓは、めっき浴槽１中のシンクロール３によって上方に転換されてサポートロール４を通過しめっき浴槽１を出る。その後、ガスワイピングノズル５により鋼帯Ｓ表面の余剰の溶融金属が吹き落とされ、所定のめっき厚さに調整される。   FIG. 1 is a cross-sectional view showing an embodiment of the intra-snout foreign matter discharging apparatus of the present invention. As shown in FIG. 1, in a continuous molten metal plating facility, a snout 2 is inserted into the molten metal in the plating bath 1, and the steel strip S is continuously carried into the molten metal via the snout 2. The The steel strip S carried into the plating bath 1 through the snout 2 is converted upward by the sink roll 3 in the plating bath 1, passes through the support roll 4, and exits the plating bath 1. Thereafter, excess molten metal on the surface of the steel strip S is blown off by the gas wiping nozzle 5 and adjusted to a predetermined plating thickness.

本発明のスナウト内異物排出装置は、スナウト２内の異物を移送する移送管６を有する。移送管６は、移送管６の一端を形成しスナウト２内に設置される吸込側配管６ａと、移送管６の他端側を形成しスナウト２外に設置される排出側配管６ｂとからなる。移送管６は、例えば、曲管部を有するＵ字型形状であればよい。排出側配管６ｂ内にはスクリュー７が挿入されている。スクリュー７の一端はスクリュー軸駆動部８を成しており、スクリュー軸駆動部８と排出側配管６ｂは、めっき浴槽１外で接続部９を介して接続されている。   The in-snout foreign matter discharging apparatus of the present invention has a transfer pipe 6 for transferring foreign matter in the snout 2. The transfer pipe 6 includes a suction side pipe 6 a that forms one end of the transfer pipe 6 and is installed in the snout 2, and a discharge side pipe 6 b that forms the other end of the transfer pipe 6 and is installed outside the snout 2. . The transfer pipe 6 may be, for example, a U-shape having a curved pipe portion. A screw 7 is inserted into the discharge side pipe 6b. One end of the screw 7 forms a screw shaft driving unit 8, and the screw shaft driving unit 8 and the discharge side pipe 6 b are connected to each other outside the plating bath 1 through a connection unit 9.

排出側配管６ｂの側面には排出口１０が形成されている。排出口１０は、めっき浴槽３中に開口するように形成されている。スナウト２内の異物１１は、吸込側配管６ａから吸い込まれ、スクリュー７の稼動により移送管６内を移動し、最終的に排出側配管６ｂを介して排出口１０からスナウト２外に排出される。   A discharge port 10 is formed on the side surface of the discharge side pipe 6b. The discharge port 10 is formed so as to open into the plating bath 3. The foreign matter 11 in the snout 2 is sucked from the suction side pipe 6a, moves in the transfer pipe 6 by the operation of the screw 7, and is finally discharged out of the snout 2 from the discharge port 10 through the discharge side pipe 6b. .

本発明において、スクリュー７はめっき浴面に対して傾斜して設置されていることを特徴とする。スクリュー７がめっき浴面に対して傾斜していることにより、浴面に対して垂直に対して設置する場合に比べて、移送管６の曲管部での圧力損失が小さい。また、スクリュー７の羽根枚数をより多くすることができるため、異物の排出効率が向上する。このため、移送管６内に異物が固着しにくくなり、スナウト内異物排出装置の取替頻度を低減させることができる。したがって、本発明のスナウト内異物排出装置は、長期間に亘って使用することができる。なお、本発明において、「スクリュー」とは、ねじ羽根付きの軸を回転させて、スナウト内の異物１１に軸方向の推進力を与えて連続的に搬送させるものである。   In the present invention, the screw 7 is installed to be inclined with respect to the plating bath surface. Since the screw 7 is inclined with respect to the plating bath surface, the pressure loss at the curved pipe portion of the transfer tube 6 is small as compared with the case where the screw 7 is installed perpendicular to the bath surface. Moreover, since the number of blades of the screw 7 can be increased, the foreign matter discharge efficiency is improved. For this reason, it becomes difficult for foreign matters to adhere to the inside of the transfer pipe 6, and the replacement frequency of the foreign matter discharging apparatus within the snout can be reduced. Therefore, the snout foreign matter discharging apparatus of the present invention can be used for a long period of time. In the present invention, the term “screw” refers to rotating a shaft with a screw blade to continuously convey the foreign material 11 in the snout by applying an axial driving force.

スクリュー７のねじ羽根のピッチとしては、少なくとも１．５ピッチ以上が望ましい。１．５ピッチ未満の場合、異物の排出効率が低下する。   The pitch of the screw blades of the screw 7 is preferably at least 1.5 pitch or more. When the pitch is less than 1.5, the foreign matter discharge efficiency decreases.

スクリュー７の傾斜角度としては、浴面から３０度以上８０度以下であることが好ましい。傾斜角度が３０度未満では、スクリュー７の軸が大きくたわみ、移送管６とスクリュー７の羽根が接触する恐れがある。傾斜角度が８０度超えでは、スクリュー７のねじ羽根のピッチを増やすことができず、その結果、異物の排出効率が低下する。   The inclination angle of the screw 7 is preferably not less than 30 degrees and not more than 80 degrees from the bath surface. If the inclination angle is less than 30 degrees, the axis of the screw 7 is greatly deflected, and there is a possibility that the transfer pipe 6 and the blades of the screw 7 come into contact with each other. If the inclination angle exceeds 80 degrees, the pitch of the screw blades of the screw 7 cannot be increased, and as a result, the foreign matter discharge efficiency decreases.

スクリュー７の羽根および軸は、高温の溶融金属に浸漬されているので、耐食性材料であることが好ましい。あわせて、スクリュー７の羽根および軸は、肉盛溶接加工を施しているものを用いることが好ましい。耐食性材料を用いて肉盛溶接加工を施していることにより、耐食性が向上し、腐食による溶損の発生を防ぐことができる。   Since the blades and shaft of the screw 7 are immersed in a high-temperature molten metal, it is preferable that the screw 7 be made of a corrosion-resistant material. In addition, it is preferable to use the blade and shaft of the screw 7 that have been subjected to overlay welding. By performing build-up welding using a corrosion-resistant material, the corrosion resistance is improved and the occurrence of melting damage due to corrosion can be prevented.

また、スクリュー軸駆動部８と排出側配管６ｂは、めっき浴槽１外で接続されている。そのため、スクリュー軸駆動部８の溶融金属の付着を防止することができる。さらに、スクリュー軸駆動部８と排出側配管６ｂは、接続部９で接続されている。そのため、容易にスクリュー７を移送管６から脱着することができる。したがって、容易に移送管６の交換が可能である。   Further, the screw shaft driving unit 8 and the discharge side pipe 6 b are connected outside the plating bath 1. Therefore, adhesion of the molten metal of the screw shaft drive part 8 can be prevented. Further, the screw shaft drive unit 8 and the discharge side pipe 6 b are connected by a connection unit 9. Therefore, the screw 7 can be easily detached from the transfer pipe 6. Therefore, the transfer pipe 6 can be easily replaced.

連続溶融亜鉛めっき設備において、図１に示す本発明のスナウト内異物排出装置を用いて溶融亜鉛めっき鋼板を製造した。めっき浴の温度は４６０±５℃とし、Ａｌを質量％で０．１２〜０．１５％添加した亜鉛−Ａｌ浴（Ｆｅ：０．０５％以下、Ｐｂ：０．０２％以下）を用いた。また、スクリューには、２ピッチ（１６９ｍｍ）のねじ羽根（２条ねじタイプ）を用いた。スクリューの傾斜角度は５６度とした。ライン稼動中は常時使用状態とした。その結果、使用開始から６０日が経過しても、異物による移送管の閉塞がなく使用可能な状態を維持することができた。また、腐食による溶損もほとんどなかった。この耐用期間は、以前使用していた噴流型ポンプの実績耐用期間３０日に比べ２倍以上に長い。   In a continuous hot dip galvanizing facility, a hot dip galvanized steel sheet was produced using the in-snout foreign matter discharging apparatus of the present invention shown in FIG. The temperature of the plating bath was 460 ± 5 ° C., and a zinc-Al bath (Fe: 0.05% or less, Pb: 0.02% or less) added with 0.12 to 0.15% by mass of Al was used. . Moreover, the screw pitch (169 mm) screw blade (double thread type) was used for the screw. The inclination angle of the screw was 56 degrees. During line operation, it was always in use. As a result, even after 60 days had passed since the start of use, the transfer tube was not blocked by foreign matter, and a usable state could be maintained. Also, there was almost no erosion due to corrosion. This service life is more than twice as long as the 30-day actual service life of the jet pump that was previously used.

１ めっき浴槽
２ スナウト
３ シンクロール
４ サポートロール
５ ガスワイピングノズル
６ 移送管
６ａ 吸込側配管
６ｂ 排出側配管
７ スクリュー
８ スクリュー軸駆動部
９ 接続部
１０ 排出口
１１ 異物
Ｓ 鋼帯 DESCRIPTION OF SYMBOLS 1 Plating bath 2 Snout 3 Sink roll 4 Support roll 5 Gas wiping nozzle 6 Transfer pipe 6a Suction side piping 6b Outlet side piping 7 Screw 8 Screw shaft drive part 9 Connection part 10 Outlet 11 Foreign material S Steel strip

Claims (3)

連続的に鋼帯を溶融金属めっきする設備において、先端部がめっき浴内に浸漬されたスナウトの内部に発生する異物をスナウト内異物排出装置で排出するに際し、
前記スナウト内異物排出装置は、前記スナウト内に配置されて前記スナウト内の異物を吸入する吸込側配管と、前記スナウト外に配置されて前記スナウト内の異物を排出する排出側配管とを備える移送管を有し、
前記排出側配管内にはスクリューが挿入されており、前記スクリューはめっき浴面に対して傾斜して設置されていることを特徴とするスナウト内異物排出装置。 In the facility for continuously metal-plating the steel strip, when discharging the foreign matter generated inside the snout whose tip is immersed in the plating bath with the foreign matter discharging device in the snout,
The in-snout foreign matter discharging apparatus includes a suction side pipe that is disposed in the snout and sucks in the snout, and a discharge side pipe that is disposed outside the snout and discharges the foreign matter in the snout. Has a tube,
A screw is inserted into the discharge-side pipe, and the screw is installed to be inclined with respect to the plating bath surface. 前記スクリューの羽根および軸は耐食性材料で形成されているとともに、肉盛溶接加工を施されていることを特徴とする請求項１に記載のスナウト内異物排出装置。   2. The foreign matter discharging apparatus according to claim 1, wherein the blade and the shaft of the screw are made of a corrosion-resistant material and are subjected to overlay welding. 前記スクリューはスクリュー軸駆動部を有し、前記スクリュー軸駆動部と前記排出側配管は、めっき浴外で接続されていることを特徴とする請求項１または２に記載のスナウト内異物排出装置。   The said screw has a screw shaft drive part, The said screw shaft drive part and the said discharge side piping are connected outside the plating bath, The foreign material discharge apparatus in a snout of Claim 1 or 2 characterized by the above-mentioned.
JP2012213293A 2012-09-27 2012-09-27 Snout foreign matter discharger Active JP6160051B2 (en)

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CN201380050823.9A CN104685090B (en) 2012-09-27 2013-09-25 Foreign body discharger in spout
DE112013004765.9T DE112013004765T5 (en) 2012-09-27 2013-09-25 Internal lock pollution control device
IN1670DEN2015 IN2015DN01670A (en) 2012-09-27 2013-09-25
PCT/JP2013/005650 WO2014050082A1 (en) 2012-09-27 2013-09-25 In-snout contaminant discharging apparatus
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JP2021525311A (en) * 2018-05-25 2021-09-24 アルセロールミタル Immersion coating method for metal strips
US11584980B2 (en) 2018-05-25 2023-02-21 Arcelormittal Apparatus for dip-coating a metal strip using a movable overflow
KR102148459B1 (en) * 2019-05-03 2020-08-26 (주)스텝이엔지 Apparatus for removing dross in hot dip galvanizing process of steel plate
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