JPH04325663A - Apparatus for controlling coating weight of plating metal in hot-dip plated steel strip - Google Patents
Apparatus for controlling coating weight of plating metal in hot-dip plated steel stripInfo
- Publication number
- JPH04325663A JPH04325663A JP9521391A JP9521391A JPH04325663A JP H04325663 A JPH04325663 A JP H04325663A JP 9521391 A JP9521391 A JP 9521391A JP 9521391 A JP9521391 A JP 9521391A JP H04325663 A JPH04325663 A JP H04325663A
- Authority
- JP
- Japan
- Prior art keywords
- plating
- height
- steel strip
- nozzle
- plating bath
- 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.)
- Withdrawn
Links
- 238000007747 plating Methods 0.000 title claims abstract description 74
- 239000002184 metal Substances 0.000 title claims abstract description 29
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 29
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 19
- 239000010959 steel Substances 0.000 title claims abstract description 19
- 239000011248 coating agent Substances 0.000 title abstract description 16
- 238000000576 coating method Methods 0.000 title abstract description 16
- 238000002347 injection Methods 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 8
- 238000007598 dipping method Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 5
- 238000005086 pumping Methods 0.000 description 3
- 230000008021 deposition Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000008397 galvanized steel Substances 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Landscapes
- Coating With Molten Metal (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は溶融金属めっき浴上方の
鋼帯出口近傍に一対の気体噴射ノズルを設けた鋼帯表裏
のめっき付着量制御装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for controlling the amount of plating on the front and back sides of a steel strip, which includes a pair of gas injection nozzles near the steel strip outlet above a molten metal plating bath.
【０００２】0002
【従来の技術】一般に、溶融めっき鋼帯のめっき金属の
付着量を制御する場合、溶融金属めっき浴上方の鋼帯出
口近傍に一対の気体噴射ノズルを設け、ノズルの気体圧
力、ノズルと鋼帯間距離、鋼帯通板速度、めっき浴面と
ノズル間距離、めっき浴温度などの操作要因を変更する
ことにより、目標とする鋼帯のめっき付着量を得るよう
な制御が行われている。このような鋼帯のめっき付着量
を制御する技術としては例えば特開昭４９−３６５３７
号公報を代表的な例として、様々な技術が知られている
。[Prior Art] Generally, when controlling the amount of coating metal deposited on a hot-dip galvanized steel strip, a pair of gas injection nozzles is provided near the outlet of the steel strip above the hot-dip metal plating bath, and the gas pressure of the nozzles is adjusted between the nozzle and the steel strip. Control is performed to obtain a target coating weight on the steel strip by changing operating factors such as the distance between the steel strip and the nozzle, the distance between the coating bath surface and the nozzle, and the coating bath temperature. As a technique for controlling the amount of coating on such steel strips, for example, Japanese Patent Application Laid-Open No. 49-36537
Various techniques are known, with Publication No.
【０００３】0003
【発明が解決しようとする課題】通常のめっき金属のめ
っき浴外への持ち出しは微々たるものであるのに対し、
めっき浴へめっき金属を補給する場合は持出し量に対応
する補給速度で補給を行う有効な手段がなく、めっき金
属のインゴットを徐々に投入する手段、溶融めっき金属
をポンプでめっき浴へ送り込む手段等が一般的で、めっ
き金属を補給していない時に比較し、急激なめっき浴面
高さの変化を伴う。また、めっき浴成分切替え時にめっ
き浴からめっき金属を汲み出すような場合も同様である
。このような浴面高さの急変時においては従来の方法で
は上記気体噴射ノズルとめっき浴面間距離の急変が外乱
になり、均一な付着量を得ることができないという問題
があった。[Problem to be solved by the invention] While the amount of ordinary plated metal taken out of the plating bath is very small,
When replenishing plating metal to a plating bath, there is no effective means for replenishing at a replenishment rate corresponding to the amount taken out, such as a method of gradually introducing ingots of plating metal, a method of sending hot-dip plating metal to the plating bath with a pump, etc. is common, and is accompanied by a rapid change in the plating bath surface height compared to when plating metal is not replenished. The same applies to the case where plating metal is pumped out from the plating bath when switching the plating bath components. When there is a sudden change in the bath surface height, the conventional method has a problem in that the sudden change in the distance between the gas injection nozzle and the plating bath surface causes a disturbance, making it impossible to obtain a uniform coating amount.
【０００４】本発明はこのようなめっき浴面高さの急変
というめっき付着量制御の外乱を取り除き定常状態と同
様の均一なめっき付着量を得る技術を提供することを目
的とする。An object of the present invention is to provide a technique for eliminating the disturbance in controlling the amount of plating deposited, such as the sudden change in the height of the plating bath surface, and obtaining a uniform amount of plating deposited as in a steady state.
【０００５】[0005]
【課題を解決するための手段】本発明は前記問題点を解
決するために、めっき浴へめっき金属を補給する時また
はめっき浴からめっき金属を汲み出した時に発生するめ
っき浴高さの変化に追従して、めっき浴面とノズル間距
離を一定に保つように気体噴射ノズルを移動させること
にしたものである。すなわち本発明は溶融金属めっき浴
上方の鋼帯出口近傍に設けた一対の気体噴射ノズルを用
いて鋼帯の表裏のめっき付着量を制御するめっき金属付
着量制御装置に適用されるものであって、浴面高さを実
測する高さ測定装置と、この測定装置の測定値に基づい
て浴面とノズルとの距離を一定に保つようにノズルを移
動させる移動装置とを備えたことを特徴とする。[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention follows changes in the height of the plating bath that occur when replenishing plating metal to the plating bath or when plating metal is pumped out from the plating bath. Therefore, it was decided to move the gas injection nozzle so as to keep the distance between the plating bath surface and the nozzle constant. That is, the present invention is applied to a plating metal coating amount control device that controls the coating amount on the front and back sides of a steel strip using a pair of gas injection nozzles provided near the steel strip outlet above a hot-dip metal plating bath. , characterized by comprising a height measuring device for actually measuring the height of the bath surface, and a moving device for moving the nozzle so as to maintain a constant distance between the bath surface and the nozzle based on the measured value of the measuring device. do.
【０００６】[0006]
【作用】本発明によれば、めっき浴面高さ測定装置を設
置し、めっき浴面高さを実測した後、めっき浴面とノズ
ル間距離を一定に保つようにノズルを上下方向に移動す
るようにしたから、めっき浴面高さに急激な変化を生じ
た場合にもめっき浴面とノズル間距離を一定に保つこと
ができ、めっき付着量の外乱要因の一つであるめっき浴
面とノズル間距離の変動が取り除かれることになり、均
一なめっき付着量を得ることができるようになった。[Operation] According to the present invention, after installing a plating bath surface height measuring device and actually measuring the plating bath surface height, the nozzle is moved in the vertical direction so as to maintain a constant distance between the plating bath surface and the nozzle. This makes it possible to maintain a constant distance between the plating bath surface and the nozzle even if there is a sudden change in the plating bath surface height, which is one of the disturbance factors for plating deposition amount. This eliminates fluctuations in the distance between nozzles, making it possible to obtain a uniform coating amount.
【０００７】[0007]
【実施例】図１は本発明の１実施例を示す模式図である
。鋼帯１をめっき浴２内に浸漬して引上げる装置に設け
ためっき浴面高さ検出装置３は、めっき浴２の上面位置
を常時検出し、この検出された信号はめっき浴面高さ測
定装置６を介してめっき付着量制御装置７へ入力される
。まためっき金属補給制御装置８からはめっき金属補給
中の信号が、めっき浴金属汲出し制御装置１０からはめ
っき浴金属汲出し中の信号がそれぞれめっき付着量制御
装置７へ入力される。めっき付着量制御装置７はめっき
金属補給中信号またはめっき浴金属汲出し中信号が入力
されている時ノズル噴射気体圧力、ノズルと鋼板間距離
、鋼帯通板速度、めっき浴温度等の操作要因に変化がな
く定常状態であると判定した場合に、めっき浴面高さ測
定装置６より入力されためっき浴面高さの変動量に応じ
て、ノズル高さ駆動制御装置９に対して、ノズル４の高
さの変更指令を出力する。ノズル高さ変更装置５はノズ
ル高さ駆動制御装置９の指令に従ってノズル４を上下に
昇降させる。Embodiment FIG. 1 is a schematic diagram showing one embodiment of the present invention. A plating bath surface height detection device 3 installed in a device for dipping the steel strip 1 into the plating bath 2 and pulling it up constantly detects the top surface position of the plating bath 2, and this detected signal indicates the plating bath surface height. It is input to the plating coating amount control device 7 via the measuring device 6. Further, a signal indicating that plating metal is being supplied is input from the plating metal supply control device 8, and a signal indicating that plating bath metal is being pumped is input from the plating bath metal pumping control device 10 to the plating coating amount control device 7. When the plating metal replenishment signal or the plating bath metal pumping signal is input, the plating coating amount control device 7 controls operating factors such as the nozzle injection gas pressure, the distance between the nozzle and the steel plate, the steel strip threading speed, and the plating bath temperature. When it is determined that there is no change in the plating bath surface height and that it is in a steady state, the nozzle height drive control device 9 controls the nozzle height according to the amount of variation in the plating bath surface height inputted from the plating bath surface height measuring device 6. Outputs the command to change the height of 4. The nozzle height changing device 5 raises and lowers the nozzle 4 according to commands from the nozzle height drive control device 9.
【０００８】溶融亜鉛めっき浴に１トンの亜鉛インゴッ
トを補給した時、めっき浴面レベルは約１０ｍｍ上昇し
ノズル高さを変更させない場合、補給前後で鋼帯めっき
量は約０．３ｇ／ｍ２ の変化を生じたが本発明を実施
することにより補給前後でもめっき付着量にはほとんど
変化が見られずに良好な結果が得られた。When a hot-dip galvanizing bath is replenished with 1 ton of zinc ingots, the plating bath level rises by about 10 mm, and if the nozzle height is not changed, the amount of steel strip plating before and after replenishing is about 0.3 g/m2. However, by implementing the present invention, good results were obtained with almost no change in the amount of plating deposited before and after replenishment.
【０００９】[0009]
【発明の効果】本発明はめっき浴面高さが急激に変動し
た場合にめっき浴面高さの変動量に応じてノズル高さを
変化させ、めっき浴面とノズル間距離が一定になるよう
にノズル高さを制御するようにしたから、めっき浴面高
さの変動の前後でも均一なめっき付着量を得ることがで
きるようになった。[Effects of the Invention] The present invention changes the nozzle height according to the amount of variation in the plating bath surface height when the plating bath surface height changes rapidly, so that the distance between the plating bath surface and the nozzle becomes constant. By controlling the nozzle height, it is now possible to obtain a uniform amount of plating even before and after fluctuations in the plating bath surface height.
【図１】図１は本発明の実施例を示すブロック図である
。FIG. 1 is a block diagram showing an embodiment of the present invention.
【符号の説明】 １ 鋼帯 ２ めっき浴 ３ めっき浴面高さ検出装置 ４ 気体噴射ノズル ５ ノズル高さ変更装置 ６ めっき浴面高さ測定装置 ７ めっき付着量制御装置 ８ めっき金属補給制御装置 ９ ノズル高さ駆動制御装置 １０ めっき浴金属汲出し制御装置[Explanation of symbols] 1 Steel strip 2 Plating bath 3 Plating bath surface height detection device 4 Gas injection nozzle 5 Nozzle height changing device 6 Plating bath surface height measuring device 7 Plating deposition amount control device 8 Plating metal supply control device 9 Nozzle height drive control device 10 Plating bath metal pumping control device
Claims (1)
に近接して一対の気体噴射ノズルを設けて鋼帯の表裏の
めっき付着量を制御する装置において、浴面高さを実測
する高さ測定装置を備え、該測定装置の測定値に基づき
浴面と前記ノズルとの距離を一定に保つように前記ノズ
ルを移動させる移動装置を備えたことを特徴とする溶融
めっき鋼帯のめっき金属付着量制御装置。Claim 1: A device for controlling the amount of plating deposited on the front and back sides of a steel strip by installing a pair of gas injection nozzles close to both sides of a steel strip pulled up from a hot-dip metal plating bath. A plated metal of a hot-dipped steel strip, characterized in that the plated metal is equipped with a thickness measuring device, and a moving device that moves the nozzle so as to maintain a constant distance between the bath surface and the nozzle based on the measured value of the measuring device. Adhesion amount control device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9521391A JPH04325663A (en) | 1991-04-25 | 1991-04-25 | Apparatus for controlling coating weight of plating metal in hot-dip plated steel strip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9521391A JPH04325663A (en) | 1991-04-25 | 1991-04-25 | Apparatus for controlling coating weight of plating metal in hot-dip plated steel strip |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04325663A true JPH04325663A (en) | 1992-11-16 |
Family
ID=14131474
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9521391A Withdrawn JPH04325663A (en) | 1991-04-25 | 1991-04-25 | Apparatus for controlling coating weight of plating metal in hot-dip plated steel strip |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04325663A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003027346A1 (en) * | 2001-09-20 | 2003-04-03 | Sms Demag Aktiengesellschaft | Method and device for coating the surface of elongated metal products |
-
1991
- 1991-04-25 JP JP9521391A patent/JPH04325663A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003027346A1 (en) * | 2001-09-20 | 2003-04-03 | Sms Demag Aktiengesellschaft | Method and device for coating the surface of elongated metal products |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Application deemed to be withdrawn because no request for examination was validly filed |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19980711 |