JP6604254B2

JP6604254B2 - Cold-rolled steel strip cleaning equipment and cleaning method

Info

Publication number: JP6604254B2
Application number: JP2016073982A
Authority: JP
Inventors: 裕貴奥平; 薫平松; 勝秀征矢; 隆之山田
Original assignee: Nippon Steel Corp
Current assignee: Nippon Steel Corp
Priority date: 2016-04-01
Filing date: 2016-04-01
Publication date: 2019-11-13
Anticipated expiration: 2036-04-01
Also published as: JP2017186583A

Description

本発明は、冷延鋼帯の洗浄設備および洗浄方法に関する。 The present invention relates to a cold-rolled steel strip cleaning facility and cleaning method.

熱延鋼帯を所定の板厚まで冷間圧延することで得られる冷延鋼帯（以下、単に「鋼帯」ともいう）は、焼鈍設備において焼鈍処理されることが一般的である。一方、鋼帯表面には冷間圧延時に噴射される圧延油や、鉄粉、塵埃等が付着しており、通常は焼鈍処理の前に圧延油等の付着物を除去するために鋼帯が洗浄される。鋼帯の洗浄が不十分であると、製品品質に悪影響を与えることが懸念される。 Generally, a cold-rolled steel strip (hereinafter, also simply referred to as “steel strip”) obtained by cold-rolling a hot-rolled steel strip to a predetermined thickness is annealed in an annealing facility. On the other hand, rolling oil sprayed at the time of cold rolling, iron powder, dust, etc. adhere to the surface of the steel strip, and usually the steel strip is used to remove deposits such as rolling oil before annealing treatment. Washed. Insufficient cleaning of the steel strip is likely to adversely affect product quality.

従来の鋼帯の洗浄装置には、アルカリ溶液等の洗浄液に鋼帯を浸漬させてブラシスクラバーで鋼帯表面の付着物を除去する特許文献１に示す装置や、洗浄液を鋼帯表面に噴射して付着物を除去する特許文献２に示す装置がある。 Conventional steel strip cleaning devices include a device shown in Patent Document 1 in which a steel strip is immersed in a cleaning solution such as an alkaline solution and the steel strip surface is removed with a brush scrubber, or a cleaning liquid is sprayed onto the surface of the steel strip. There is an apparatus shown in Patent Document 2 that removes deposits.

これらの洗浄装置では、作業者が所定の頻度で鋼帯表面が適切に洗浄されているか否かについて洗浄度評価を実施していた。鋼帯の洗浄度評価は、例えば洗浄後の鋼帯表面の付着物の有無を目視で確認する目視チェックや、洗浄後の鋼帯表面にテープを貼り、剥がしたテープに付着する鉄粉等の量を目視確認するテープテストによって行われる。 In these cleaning apparatuses, the operator has performed a cleaning degree evaluation on whether or not the steel strip surface is appropriately cleaned at a predetermined frequency. The steel strip cleaning degree evaluation is, for example, a visual check for visually confirming the presence or absence of deposits on the surface of the steel strip after cleaning, or iron powder attached to the tape after the tape is applied to the surface of the steel strip after cleaning. This is done by a tape test that visually confirms the amount.

一方、洗浄度評価は、焼鈍設備の入側に設けられたルーパーの鋼帯蓄積量や鋼帯を払い出すコイルの残長等を考慮して行う必要があり、洗浄度評価を実施するタイミングには制限がある。また、作業者の主観による洗浄度評価は、評価結果にバラつきが生じることが懸念される。このため、洗浄度評価の実施タイミングが制限されずに定量的な洗浄度評価を実施することが望まれる。 On the other hand, it is necessary to evaluate the cleanliness in consideration of the accumulated amount of the steel strip of the looper provided on the entrance side of the annealing equipment and the remaining length of the coil for discharging the steel strip. There are limitations. In addition, there is a concern that the evaluation result of the cleaning degree based on the subjectivity of the operator may vary. For this reason, it is desirable to perform a quantitative cleaning degree evaluation without limiting the execution timing of the cleaning degree evaluation.

これに対し、特許文献３では、洗浄後の鋼帯表面の輻射率または色調を計測する洗浄装置が開示されている。特許文献３の洗浄装置は、鋼帯の電解洗浄を行う電解槽と、鋼帯表面の付着物を除去するブラシスクラバーと、鋼帯表面に残存する洗浄液を除去するリンスタンクとを備えており、リンスタンクの下流側には洗浄後の鋼帯表面の輻射率または色調を計測するセンサーが設けられている。特許文献３の洗浄装置では、計測された輻射率または色調に基づいて鋼帯表面の鉄粉残存量が推定され、これにより鋼帯の洗浄度評価がなされている。 On the other hand, Patent Document 3 discloses a cleaning device that measures the emissivity or color tone of the steel strip surface after cleaning. The cleaning device of Patent Document 3 includes an electrolytic bath that performs electrolytic cleaning of a steel strip, a brush scrubber that removes deposits on the surface of the steel strip, and a rinse tank that removes cleaning liquid remaining on the surface of the steel strip. A sensor for measuring the emissivity or color tone of the surface of the steel strip after cleaning is provided on the downstream side of the rinse tank. In the cleaning apparatus of Patent Document 3, the residual amount of iron powder on the surface of the steel strip is estimated based on the measured radiation rate or color tone, thereby evaluating the cleanliness of the steel strip.

特開２００５−２５６０６７号公報JP 2005-256067 A 特開平１１−２４６９８２号公報Japanese Patent Laid-Open No. 11-246982 特開平９−３０２４８８号公報JP-A-9-302488

鋼帯の洗浄装置は、連続して稼働させていると洗浄能力が次第に低下していく。一方で、鋼帯表面の汚れの程度に関わらず所望の洗浄品質を有する鋼帯を得るためには、洗浄装置が常に十分な洗浄能力を有していることが求められる。 When the steel strip cleaning device is continuously operated, the cleaning capability gradually decreases. On the other hand, in order to obtain a steel strip having a desired cleaning quality regardless of the degree of contamination on the surface of the steel strip, it is required that the cleaning device always has a sufficient cleaning ability.

しかしながら、特許文献３の洗浄装置では、現に有している洗浄装置の洗浄能力を評価することができない。例えば鋼帯表面の圧延油等の付着物の量が洗浄前の段階から少ない場合、特許文献３のような洗浄後の鋼帯の表面状態に基づく洗浄度評価では、洗浄装置の洗浄能力が実際には低下している場合であっても鋼帯の洗浄度は問題ないと判定される。即ち、洗浄装置の洗浄能力が低下しているにも関わらず、洗浄装置が十分な洗浄能力を有していると判断されるおそれがある。洗浄能力が低下した洗浄装置を使用し続けると、付着物量が多い鋼帯が洗浄装置に到達した際に鋼帯を十分に洗浄することができず、所望の洗浄品質に達していない鋼帯が後工程に進んでしまう。 However, the cleaning device of Patent Document 3 cannot evaluate the cleaning capability of the cleaning device that is currently provided. For example, when the amount of deposits such as rolling oil on the surface of the steel strip is small from the level before cleaning, in the cleaning degree evaluation based on the surface state of the steel strip after cleaning as in Patent Document 3, the cleaning capability of the cleaning device is actually Even if it is lowered, it is determined that there is no problem in the cleaning degree of the steel strip. That is, although the cleaning capability of the cleaning device is reduced, it may be determined that the cleaning device has sufficient cleaning capability. If you continue to use a cleaning device with a reduced cleaning capacity, when a steel strip with a large amount of deposits reaches the cleaning device, the steel strip cannot be sufficiently cleaned, and there are steel strips that do not reach the desired cleaning quality. Proceed to the subsequent process.

本発明は、上記事情に鑑みてなされたものであり、冷延鋼帯の洗浄中における洗浄装置の洗浄能力評価を可能にし、鋼帯表面の洗浄品質を良好に保つことを目的とする。 The present invention has been made in view of the above circumstances, and an object of the present invention is to make it possible to evaluate the cleaning ability of a cleaning device during cleaning of a cold-rolled steel strip and to keep the cleaning quality of the steel strip surface good.

上記課題を解決する本発明は、走行する冷延鋼帯を洗浄する洗浄装置と、前記洗浄装置の入側において前記冷延鋼帯の表面の輝度を測定する入側輝度測定装置と、前記洗浄装置の出側において前記冷延鋼帯の表面の輝度を測定する出側輝度測定装置と、前記入側輝度測定装置で得られる入側輝度と前記出側輝度測定装置で得られる出側輝度との輝度差を算出する制御部とを備え、前記制御部は、前記輝度差と予め設定された輝度差閾値とを対比し、前記輝度差が前記輝度差閾値未満である場合に、前記洗浄装置の洗浄能力が低下していることを示す通知表示を表示部に表示させるように構成されていることを特徴としている。 The present invention that solves the above problems includes a cleaning device that cleans a traveling cold-rolled steel strip, an entrance-side brightness measuring device that measures the brightness of the surface of the cold-rolled steel strip on the entrance side of the cleaning device, and the cleaning An exit-side brightness measuring device that measures the brightness of the surface of the cold-rolled steel strip on the exit side of the device, an entrance-side brightness obtained by the entrance-side brightness measuring device, and an exit-side brightness obtained by the exit-side brightness measuring device; A control unit that calculates a luminance difference of the cleaning device, wherein the control unit compares the luminance difference with a preset luminance difference threshold value, and when the luminance difference is less than the luminance difference threshold value, the cleaning device It is characterized by the fact that a notification display indicating that the cleaning ability is reduced is displayed on the display unit.

本発明によれば、洗浄前後の鋼帯の輝度差に基づいて洗浄装置の洗浄能力を評価することが可能になる。これにより、洗浄装置の洗浄能力の低下によって鋼帯の洗浄品質に悪影響を及ぼす前に洗浄装置のメンテナンスを行うことが可能となる。 According to the present invention, it becomes possible to evaluate the cleaning ability of a cleaning device based on the luminance difference between steel strips before and after cleaning. Thereby, it becomes possible to perform maintenance of the cleaning device before the cleaning quality of the steel strip is adversely affected due to a decrease in cleaning performance of the cleaning device.

また、別の観点による本発明は、走行する冷延鋼帯を洗浄する洗浄装置の入側および出側において前記冷延鋼帯の表面の輝度を測定し、前記洗浄装置の入側で測定された入側輝度と前記洗浄装置の出側で測定された出側輝度との輝度差を算出し、前記輝度差と予め設定した輝度差閾値とを対比し、前記輝度差が前記輝度差閾値未満である場合に前記洗浄装置の洗浄能力を回復させるメンテナンスを実施することを特徴としている。 In another aspect of the present invention, the brightness of the surface of the cold-rolled steel strip is measured on the entrance side and the exit side of the cleaning device for cleaning the cold-rolled steel strip that travels, and is measured on the entrance side of the cleaning device. Calculating a luminance difference between the incoming luminance measured on the outgoing side and the outgoing luminance measured on the outgoing side of the cleaning device, and comparing the luminance difference with a preset luminance difference threshold, wherein the luminance difference is less than the luminance difference threshold. In this case, the maintenance is performed to restore the cleaning capability of the cleaning device.

本発明によれば、冷延鋼帯の洗浄中における洗浄装置の洗浄能力評価を可能にし、鋼帯表面の洗浄品質を良好に保つことが可能になる。 ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to evaluate the washing | cleaning capability of the washing | cleaning apparatus during washing | cleaning of a cold-rolled steel strip, and it becomes possible to maintain the cleaning quality of the steel strip surface favorable.

本発明の第１の実施形態に係る洗浄設備の概略構成を示す模式図である。It is a mimetic diagram showing a schematic structure of cleaning equipment concerning a 1st embodiment of the present invention. 本発明の第１の実施形態に係る洗浄設備の制御フローの概略を示す図である。It is a figure which shows the outline of the control flow of the washing equipment which concerns on the 1st Embodiment of this invention. 本発明の第２の実施形態に係る洗浄設備の制御フローの概略を示す図である。It is a figure which shows the outline of the control flow of the washing equipment which concerns on the 2nd Embodiment of this invention. 本発明の第３の実施形態に係る洗浄設備の制御フローの概略を示す図である。It is a figure which shows the outline of the control flow of the washing equipment which concerns on the 3rd Embodiment of this invention. 本発明に係る洗浄設備を用いた鋼帯の輝度測定の結果を示す図である。It is a figure which shows the result of the brightness | luminance measurement of the steel strip using the washing | cleaning equipment which concerns on this invention.

以下、本発明の実施形態について、図面を参照しながら説明する。なお、本明細書および図面において、実質的に同一の機能構成を有する要素においては、同一の符号を付することにより重複説明を省略する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present specification and drawings, elements having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted.

（第１の実施形態）
本発明の第１の実施形態に係る冷延鋼帯Ｓの洗浄設備１は、例えば冷延鋼帯Ｓの連続焼鈍ラインに配置される。図１に示すように、第１の実施形態に係る洗浄設備１は、走行方向Ｔに沿って走行する鋼帯Ｓを洗浄する洗浄装置１０と、洗浄装置１０の入側に設けられた輝度計（以下、「入側輝度計２０」という）と、洗浄装置１０の出側に設けられた輝度計（以下、「出側輝度計３０」という）を備えている。洗浄装置１０の下流側には鋼帯Ｓを蓄積するルーパー８０が設けられ、ルーパー８０に蓄積される鋼帯Ｓはその後焼鈍設備に向かう。第１の実施形態における出側輝度計３０は、ルーパー８０の入側近傍に配置されている。 (First embodiment)
The cold-rolled steel strip S cleaning equipment 1 according to the first embodiment of the present invention is disposed in a continuous annealing line of the cold-rolled steel strip S, for example. As shown in FIG. 1, a cleaning facility 1 according to the first embodiment includes a cleaning device 10 that cleans a steel strip S that travels along a traveling direction T, and a luminance meter that is provided on the entry side of the cleaning device 10. (Hereinafter referred to as “incoming luminance meter 20”) and a luminance meter provided on the outlet side of the cleaning apparatus 10 (hereinafter referred to as “exit luminance meter 30”). A looper 80 for accumulating the steel strip S is provided on the downstream side of the cleaning device 10, and the steel strip S accumulated in the looper 80 then goes to the annealing facility. The exit side luminance meter 30 in the first embodiment is disposed in the vicinity of the entrance side of the looper 80.

洗浄装置１０は、鋼帯Ｓの走行方向Ｔに沿って順に、鋼帯Ｓの電解洗浄を行う電解タンク１１と、鋼帯表面に残存する圧延油や鉄粉等の付着物を除去するブラシスクラバー１２と、鋼帯表面に残存する洗浄液を洗い落すリンスタンク１３と、鋼帯表面を乾燥させるドライヤー１４とを備えている。電解タンク１１には洗浄液として苛性ソーダ等のアルカリ溶液が貯留している。ブラシスクラバー１２では、上下一対のブラシロールが走行方向Ｔに沿って複数配置され、洗浄液を鋼帯Ｓに噴射する機構（図示省略）を有している。リンスタンク１３には温水が貯留している。 The cleaning device 10 includes an electrolytic tank 11 that performs electrolytic cleaning of the steel strip S in order along the traveling direction T of the steel strip S, and a brush scrubber that removes deposits such as rolling oil and iron powder remaining on the steel strip surface. 12, a rinse tank 13 for washing away the cleaning liquid remaining on the steel strip surface, and a dryer 14 for drying the steel strip surface. The electrolytic tank 11 stores an alkaline solution such as caustic soda as a cleaning liquid. The brush scrubber 12 has a pair of upper and lower brush rolls arranged along the traveling direction T, and has a mechanism (not shown) for injecting the cleaning liquid onto the steel strip S. Hot water is stored in the rinse tank 13.

入側輝度計２０は、洗浄装置１０の入側において電解タンク１１に向かう鋼帯Ｓの表面に対向するように設けられている。同様に出側輝度計３０は、ルーパー８０の入側において鋼帯Ｓの表面に対向するように設けられている。入側輝度計２０および出側輝度計３０は、ＣＣＤセンサを内蔵する輝度計であり、撮像範囲内の各画素で測定される輝度の平均値を輝度測定値として出力するタイプのものである。なお、輝度計は、ＣＣＤセンサタイプのものに限定されず、例えばＣＭＯＳセンサタイプの輝度計を用いても良い。 The entry-side luminance meter 20 is provided so as to face the surface of the steel strip S toward the electrolytic tank 11 on the entry side of the cleaning device 10. Similarly, the exit-side luminance meter 30 is provided so as to face the surface of the steel strip S on the entrance side of the looper 80. The input side luminance meter 20 and the output side luminance meter 30 are luminance meters with a built-in CCD sensor, and are of a type that outputs an average value of luminance measured at each pixel in the imaging range as a luminance measurement value. The luminance meter is not limited to the CCD sensor type, and for example, a CMOS sensor type luminance meter may be used.

洗浄設備１は、入側輝度計２０や出側輝度計３０に対して鋼帯表面の輝度の測定開始や測定終了を命令する制御部４０も備えている。なお、制御部４０は、例えば洗浄設備１を制御するための制御装置として単体で設けられていても良いし、洗浄設備１や連続焼鈍ライン全体の稼働状態を管理する管理コンピュータとして設けられていても良い。 The cleaning equipment 1 also includes a control unit 40 that instructs the entrance luminance meter 20 and the exit luminance meter 30 to start and stop measuring the luminance of the steel strip surface. In addition, the control part 40 may be provided alone as a control apparatus for controlling the cleaning facility 1, for example, or is provided as a management computer that manages the operating state of the cleaning facility 1 or the entire continuous annealing line. Also good.

制御部４０は、入側輝度計２０から出力される輝度測定値（以下、「入側輝度」という）および出側輝度計３０から出力される輝度測定値（以下、「出側輝度」という）を読み込み、出側輝度と入側輝度との差（以下、「輝度差」という）を算出する機能を有している。また、制御部４０は、入側輝度の出力間隔および出側輝度の出力間隔も制御することができる。 The control unit 40 has a luminance measurement value output from the input luminance meter 20 (hereinafter referred to as “input luminance”) and a luminance measurement value output from the output luminance meter 30 (hereinafter referred to as “output luminance”). And calculating the difference between the outgoing luminance and the incoming luminance (hereinafter referred to as “luminance difference”). The control unit 40 can also control the output interval of the incoming luminance and the output interval of the outgoing luminance.

輝度差を算出する場合、例えば任意の時間ｔにおいて測定された入側輝度および出側輝度を用いて計算される。このように輝度差を算出する場合、鋼帯表面上における出側輝度の測定箇所は、鋼帯表面上における入側輝度の測定箇所の洗浄後の箇所ではないことから、任意の時間ｔにおいて測定された入側輝度および出側輝度を用いて算出される輝度差は、厳密には鋼帯表面の同一箇所における洗浄前後の輝度差ではない。しかし、入側輝度計２０と出側輝度計３０の間の鋼帯長さはそれほど長くなく、その間の鋼帯表面の汚れの程度も同程度であることから、任意の時間ｔにおいて測定された出側輝度および入側輝度から算出される輝度差と、鋼帯表面の同一箇所における洗浄前後の輝度差との間に大きな差異はない。このため、任意の時間ｔにおいて測定された出側輝度および入側輝度から算出される輝度差を用いて洗浄能力評価を実施しても特段問題は生じない。なお、入側輝度計２０から出側輝度計３０までの鋼帯長さや通板速度等を考慮し、入側輝度の測定位置が出側輝度計３０に到達するタイミングを算出して同一箇所の輝度差を比較できるような制御を実施しても良い。 When calculating the luminance difference, for example, the luminance difference is calculated using the incoming luminance and outgoing luminance measured at an arbitrary time t. When calculating the brightness difference in this way, the measurement point of the outgoing luminance on the steel strip surface is not the location after the cleaning of the incoming luminance measurement location on the steel strip surface, so it is measured at an arbitrary time t. Strictly speaking, the luminance difference calculated by using the input side luminance and the output side luminance is not the luminance difference before and after cleaning at the same location on the surface of the steel strip. However, the length of the steel strip between the entrance side luminance meter 20 and the exit side luminance meter 30 is not so long, and the degree of contamination on the surface of the steel strip in the meantime is the same, so it was measured at an arbitrary time t. There is no significant difference between the luminance difference calculated from the outgoing luminance and incoming luminance and the luminance difference before and after cleaning at the same location on the steel strip surface. For this reason, even if cleaning performance evaluation is performed using the brightness | luminance difference calculated from the outgoing side brightness | luminance measured in arbitrary time t and an incoming side brightness | luminance, a special problem does not arise. In consideration of the steel strip length from the entrance-side luminance meter 20 to the exit-side luminance meter 30, the sheet feeding speed, etc., the timing at which the measurement position of the entry-side luminance reaches the exit-side luminance meter 30 is calculated, and You may implement control which can compare a brightness | luminance difference.

制御部４０は、輝度差と、輝度差に関して予め設定された閾値（以下、「輝度差閾値」という）との対比判定を行う機能も備えている。なお、「輝度差閾値」は、洗浄対象となり得る鋼帯Ｓの表面汚れの程度や、洗浄装置１０が本来有する最大の洗浄能力、洗浄装置１０の連続稼働による洗浄能力の低下の程度等を勘案して適宜設定される値である。輝度差閾値は、例えば輝度差が当該閾値を下回ると洗浄能力の低下が著しくなり、鋼帯Ｓの洗浄品質に悪影響を及ぼすような値に設定される。洗浄装置１０の洗浄能力の低下に因る鋼帯Ｓの洗浄品質の低下が起こらないように値を設定することが好ましい。また、制御部４０への輝度差閾値の設定は、例えばオペレーターが制御部４０として機能するパソコン等に直接入力することで設定されても良いし、鋼帯情報等の各種情報に基づいて制御部４０により算出された値が設定されても良い。 The control unit 40 also has a function of performing a comparison determination between a luminance difference and a threshold value set in advance with respect to the luminance difference (hereinafter referred to as “luminance difference threshold value”). The “brightness difference threshold value” takes into consideration the degree of surface contamination of the steel strip S that can be cleaned, the maximum cleaning ability that the cleaning apparatus 10 originally has, the degree of decrease in cleaning ability due to continuous operation of the cleaning apparatus 10, and the like. Thus, the value is set as appropriate. The brightness difference threshold value is set to such a value that, for example, when the brightness difference falls below the threshold value, the cleaning ability is significantly reduced and the cleaning quality of the steel strip S is adversely affected. It is preferable to set a value so that the cleaning quality of the steel strip S does not deteriorate due to the deterioration of the cleaning ability of the cleaning device 10. Moreover, the setting of the brightness difference threshold value to the control unit 40 may be set, for example, by an operator directly inputting to a personal computer or the like functioning as the control unit 40, or based on various information such as steel strip information. The value calculated by 40 may be set.

制御部４０は、上記対比判定を行った結果、出側輝度と入側輝度の輝度差が予め設定された輝度差閾値未満となった場合に、予め設定された所定の通知表示をパソコンのディスプレイ等の表示部５０に表示させる機能を有している。「通知表示」とは、洗浄装置１０の洗浄能力が低下していることを示すメッセージや記号等のことである。例えば通知表示として所定のメッセージを表示部５０に表示する場合には“WARNING”や“洗浄能力低下”等の通知メッセージが表示部５０に表示され、洗浄装置１０の使用を続けることで鋼帯Ｓの洗浄品質に悪影響を及ぼす旨をオペレーターに通知する。 As a result of the comparison determination, when the luminance difference between the outgoing luminance and the incoming luminance is less than a predetermined luminance difference threshold, the control unit 40 displays a predetermined notification display that is set in advance on the personal computer display. And so on. “Notification display” refers to a message or symbol indicating that the cleaning capability of the cleaning apparatus 10 is reduced. For example, when a predetermined message is displayed on the display unit 50 as a notification display, a notification message such as “WARNING” or “decrease in cleaning ability” is displayed on the display unit 50, and the steel strip S is maintained by continuing to use the cleaning device 10. Notify the operator that the cleaning quality will be adversely affected.

第１の実施形態に係る洗浄設備１は以上のように構成されている。次に、この洗浄設備１を用いた冷延鋼帯Ｓの洗浄方法について説明する。 The cleaning equipment 1 according to the first embodiment is configured as described above. Next, a method for cleaning the cold-rolled steel strip S using the cleaning equipment 1 will be described.

ペイオフリール（図示省略）から払い出されて洗浄設備１に到達する冷延鋼帯Ｓは、図１に示すように、まず洗浄装置１０の電解タンク１１内を通過する。ここでは鋼帯Ｓの電解洗浄が実施される。即ち、洗浄液に鋼帯Ｓが浸漬した状態で洗浄液の電気分解が行われ、鋼帯表面に酸素や水素の気泡を発生させることにより鋼帯表面に付着する圧延油や鉄粉等の付着物を浮き上がらせる。これにより、鋼帯表面に付着した付着物だけでなく、鋼帯表面の微細な溝に入り込んだ付着物も除去することができる。電解タンク１１を通過した鋼帯Ｓは、次にブラシスクラバー１２に進む。ブラシスクラバー１２では、鋼帯Ｓに洗浄液が噴射され、回転するブラシロールによって鋼帯表面に残存する付着物が物理的に除去される。ブラシスクラバー１２を通過した鋼帯Ｓは、次にリンスタンク１３内を通過する。ここで鋼帯Ｓがリンスタンク１３に貯留する温水内を通過することによって、鋼帯表面に残存する洗浄液が洗い落される。リンスタンク１３を通過した鋼帯Ｓは、その後ドライヤー１４により乾燥される。この乾燥工程を終えることで冷延鋼帯Ｓの洗浄工程が終了となる。洗浄装置１０を通過した鋼帯Ｓは、その後ルーパー８０を介して焼鈍設備（図示省略）に向かう。 The cold-rolled steel strip S that is paid out from a payoff reel (not shown) and reaches the cleaning facility 1 first passes through the electrolytic tank 11 of the cleaning device 10 as shown in FIG. Here, electrolytic cleaning of the steel strip S is performed. That is, electrolysis of the cleaning liquid is performed in a state where the steel strip S is immersed in the cleaning liquid, and oxygen and hydrogen bubbles are generated on the surface of the steel strip, thereby causing deposits such as rolling oil and iron powder adhering to the surface of the steel strip. Make it rise. Thereby, not only the deposit | attachment adhering to the steel strip surface but the deposit | attachment which entered into the fine groove | channel of the steel strip surface can be removed. The steel strip S that has passed through the electrolytic tank 11 then proceeds to the brush scrubber 12. In the brush scrubber 12, the cleaning liquid is sprayed onto the steel strip S, and the deposits remaining on the steel strip surface are physically removed by the rotating brush roll. The steel strip S that has passed through the brush scrubber 12 then passes through the rinse tank 13. Here, when the steel strip S passes through the hot water stored in the rinse tank 13, the cleaning liquid remaining on the steel strip surface is washed away. The steel strip S that has passed through the rinsing tank 13 is then dried by the dryer 14. By completing this drying process, the cleaning process of the cold-rolled steel strip S is completed. The steel strip S that has passed through the cleaning device 10 then goes to the annealing facility (not shown) via the looper 80.

鋼帯Ｓの洗浄工程は上述の流れで進むが、第１の実施形態の洗浄設備１においては鋼帯Ｓの洗浄中に図１に示す制御部４０で図２に示すような制御が実施される。これにより洗浄装置１０の洗浄能力の評価が行われる。以下、図２を参照しながら洗浄設備１の制御フローについて説明する。なお、以下の説明で示される符号の内、図２に表記がない符号は図１に示されている。 The cleaning process of the steel strip S proceeds in the above-described flow. However, in the cleaning equipment 1 of the first embodiment, the control as shown in FIG. 2 is performed by the control unit 40 shown in FIG. The Thereby, the cleaning capability of the cleaning device 10 is evaluated. Hereinafter, the control flow of the cleaning facility 1 will be described with reference to FIG. Of the reference numerals shown in the following description, reference numerals not shown in FIG. 2 are shown in FIG.

まず、制御部４０はステップＳ１０１として、入側輝度計２０および出側輝度計３０に対して鋼帯表面の輝度測定を開始させる。このとき制御部４０は、入側輝度計２０および出側輝度計３０に対して例えば１秒間隔で輝度測定値を出力させるように制御する。なお、鋼帯表面の輝度測定値は、鋼帯表面の汚れ具合によって値が異なってくる。例えば鋼帯表面が酷く汚れている場合は鋼帯表面の反射率が小さくなり、測定される輝度が小さくなる。一方、鋼帯表面がそれほど汚れていない場合は鋼帯表面の反射率が大きくなり、測定される輝度が大きくなる。 First, the control unit 40 causes the entrance-side luminance meter 20 and the exit-side luminance meter 30 to start measuring the brightness of the steel strip surface at step S101. At this time, the control unit 40 controls the incoming luminance meter 20 and the outgoing luminance meter 30 to output the luminance measurement values at intervals of 1 second, for example. In addition, the brightness | luminance measured value on the surface of a steel strip changes with values according to the dirt condition of the surface of a steel strip. For example, when the steel strip surface is extremely dirty, the reflectance of the steel strip surface becomes small, and the measured luminance becomes small. On the other hand, when the steel strip surface is not so dirty, the reflectance of the steel strip surface increases, and the measured luminance increases.

次に、制御部４０はステップＳ１０２として、出側輝度と入側輝度の輝度差を算出する。前述の通り、鋼帯表面の輝度の大きさは表面の汚れの程度と相関があることから、洗浄装置１０によって鋼帯表面の汚れが落ちたならば出側輝度は入側輝度に対して大きくなる。即ち、出側輝度と入側輝度との輝度差が大きければ、洗浄装置１０の洗浄能力が十分に発揮されていることになる。 Next, the control unit 40 calculates a luminance difference between the outgoing luminance and the incoming luminance in step S102. As described above, since the intensity of the steel strip surface has a correlation with the degree of surface contamination, if the steel strip surface is cleaned by the cleaning device 10, the exit luminance is larger than the entrance luminance. Become. That is, if the luminance difference between the outgoing luminance and the incoming luminance is large, the cleaning capability of the cleaning device 10 is sufficiently exhibited.

そこで、制御部４０はステップＳ１０３として、出側輝度と入側輝度から算出された輝度差と予め設定された輝度差閾値との対比を行い、どちらの値が大きいか判定する。ステップＳ１０３の判定において輝度差が輝度差閾値以上である場合、制御部４０は洗浄装置１０の洗浄能力が十分発揮されていると判断し、洗浄能力評価を終了する。 Therefore, in step S103, the control unit 40 compares the luminance difference calculated from the outgoing luminance and the incoming luminance with a preset luminance difference threshold value, and determines which value is larger. When the brightness difference is equal to or greater than the brightness difference threshold value in the determination in step S103, the control unit 40 determines that the cleaning capability of the cleaning device 10 is sufficiently exhibited, and ends the cleaning capability evaluation.

一方、ステップＳ１０３の判定において輝度差が輝度差閾値未満である場合、制御部４０は洗浄装置１０の洗浄能力が低下していると判断し、ステップＳ１０４として、通知表示の一例である警告メッセージを表示部５０に表示させる。このとき表示される警告メッセージにより、オペレーターは洗浄装置１０の洗浄能力が低下していることを認識することができる。 On the other hand, when the brightness difference is less than the brightness difference threshold in the determination in step S103, the control unit 40 determines that the cleaning capability of the cleaning device 10 is reduced, and in step S104, displays a warning message that is an example of a notification display. It is displayed on the display unit 50. From the warning message displayed at this time, the operator can recognize that the cleaning capability of the cleaning device 10 is reduced.

洗浄能力の低下を認識したオペレーターは、洗浄能力を回復させるために洗浄装置１０のメンテナンスを実施する。洗浄装置１０のメンテナンスは、例えば輝度差と輝度差閾値との差に応じて、電解洗浄における電解電流の調節や、電解タンク１１への洗浄液の添加による電解液濃度の調節、あるいは鋼帯Ｓに対するブラシロールの押し付け力を調節するといった作業が行われる。これらの作業はどれか１つだけ実施されても良いし、複数組み合わせても良い。例えば、輝度差が輝度差閾値をわずかに下回る場合には電解電流の調節のみの作業で洗浄能力を回復させることとし、輝度差が輝度差閾値を大きく下回る場合には電解電流の調節に加えて更に電解タンク１１に洗浄液を添加しても良い。 The operator who recognizes the decrease in the cleaning capability performs maintenance of the cleaning apparatus 10 in order to restore the cleaning capability. Maintenance of the cleaning apparatus 10 may be performed by adjusting an electrolytic current in electrolytic cleaning, adjusting an electrolytic solution concentration by adding a cleaning liquid to the electrolytic tank 11, or for a steel strip S depending on, for example, a difference between a luminance difference and a luminance difference threshold value. Operations such as adjusting the pressing force of the brush roll are performed. Only one of these operations may be performed, or a plurality of operations may be combined. For example, when the brightness difference is slightly below the brightness difference threshold, the cleaning ability is restored only by adjusting the electrolysis current, and when the brightness difference is significantly below the brightness difference threshold, in addition to the adjustment of the electrolysis current. Further, a cleaning solution may be added to the electrolytic tank 11.

制御部４０は、ステップＳ１０４において表示部５０に通知メッセージを表示させた後、洗浄装置１０の洗浄能力評価を終了する。なお、前述の通り、ステップＳ１０１では、入側輝度計２０および出側輝度計３０から所定の間隔で輝度測定値が出力される。このため制御部４０は、それら各輝度測定値を用いてステップＳ１０１〜Ｓ１０４に係る制御を繰り返し実行する。これにより、洗浄設備の稼働中に洗浄能力評価が繰り返し行われる。 The control unit 40 displays the notification message on the display unit 50 in step S104, and then ends the cleaning performance evaluation of the cleaning device 10. Note that, as described above, in step S101, luminance measurement values are output at predetermined intervals from the ingress luminance meter 20 and the egress luminance meter 30. For this reason, the control part 40 repeatedly performs control which concerns on step S101-S104 using each these brightness | luminance measured value. Thereby, cleaning capability evaluation is repeatedly performed during operation of cleaning equipment.

以上説明した通り、第１の実施形態に係る洗浄設備１は、洗浄装置１０の入側と出側においてそれぞれ輝度計を設けたことにより、洗浄装置１０の入側と出側における鋼帯表面の輝度差を算出することが可能となる。これにより、洗浄装置１０の洗浄能力を把握することが可能となり、鋼帯Ｓの洗浄品質に悪影響を及ぼす前に洗浄能力を回復する洗浄装置１０のメンテナンスを行うことができる。その結果、鋼帯Ｓの洗浄品質を良好に保つことができる。 As described above, the cleaning equipment 1 according to the first embodiment is provided with luminance meters on the entrance side and the exit side of the cleaning device 10, respectively, so that the steel strip surface on the entrance side and the exit side of the cleaning device 10 is provided. It is possible to calculate the luminance difference. Thereby, it becomes possible to grasp the cleaning capability of the cleaning device 10, and maintenance of the cleaning device 10 that recovers the cleaning capability before adversely affecting the cleaning quality of the steel strip S can be performed. As a result, the cleaning quality of the steel strip S can be kept good.

（第２の実施形態）
本発明の第２の実施形態に係る洗浄設備１は、洗浄能力の低下状況をより詳細に把握することを可能にする。第２の実施形態における洗浄設備１は、図１に示す第１の実施形態に係る洗浄設備１と同様の構成を有しているが、第２の実施形態では、制御部４０に輝度差閾値Ａおよび輝度差閾値Ｂといった２つの閾値が設定されている。輝度差閾値Ａは、輝度差閾値Ｂよりも小さい値であり、例えば輝度差が当該閾値を下回ると洗浄能力の低下が著しくなり、鋼帯Ｓの洗浄品質に著しい悪影響を及ぼすような値に設定される。また、輝度差閾値Ｂは、例えば輝度差が当該閾値を下回ると洗浄能力の低下がある程度認められ、輝度差閾値Ａを下回る場合ほどではないが鋼帯Ｓの洗浄品質に悪影響を及ぼすような値に設定される。 (Second Embodiment)
The cleaning facility 1 according to the second embodiment of the present invention makes it possible to grasp in more detail the deterioration status of the cleaning capability. The cleaning facility 1 in the second embodiment has the same configuration as the cleaning facility 1 according to the first embodiment shown in FIG. 1, but in the second embodiment, the control unit 40 has a luminance difference threshold value. Two threshold values such as A and luminance difference threshold value B are set. The brightness difference threshold value A is a value smaller than the brightness difference threshold value B. For example, when the brightness difference is less than the threshold value, the cleaning ability is remarkably lowered, and the brightness difference threshold value A is set to a value that significantly affects the cleaning quality of the steel strip S. Is done. Further, the brightness difference threshold B is a value such that, for example, when the brightness difference is less than the threshold, a decrease in the cleaning ability is recognized to some extent, but not so much as when the brightness difference threshold A is less, but the cleaning quality of the steel strip S is adversely affected. Set to

また、制御部４０には、通知表示のパターンが複数設定され、各輝度差閾値Ａ，Ｂと輝度差との関係に応じて異なる通知表示を表示部５０に表示させる機能を有している。以下、図３を用いて第２の実施形態に係る制御部４０の制御フローについて説明する。なお、以下の説明で示される符号のうち、図３に表記がない符号は図１に示されている。 In addition, the control unit 40 has a function of setting a plurality of notification display patterns and causing the display unit 50 to display different notification displays according to the relationship between the luminance difference thresholds A and B and the luminance difference. Hereinafter, the control flow of the control unit 40 according to the second embodiment will be described with reference to FIG. Of the reference numerals shown in the following description, reference numerals not shown in FIG. 3 are shown in FIG.

まず、図３に示すステップＳ１０１及びステップＳ１０２では、制御部４０は第１の実施形態におけるステップＳ１０１及びステップＳ１０２と同様の制御を行う。続いて、制御部４０は、ステップＳ１０３として鋼帯表面の輝度差と予め設定された輝度差閾値Ａとの対比を行い、どちらの値が大きいか判定する。 First, in step S101 and step S102 shown in FIG. 3, the control unit 40 performs the same control as in step S101 and step S102 in the first embodiment. Subsequently, the control unit 40 compares the brightness difference on the steel strip surface with a preset brightness difference threshold A in step S103, and determines which value is larger.

ステップＳ１０３の判定において輝度差が輝度差閾値Ａを下回るような場合、制御部４０は洗浄装置１０の洗浄能力が著しく低下していると判断し、ステップＳ１０４として通知表示の一例である警告メッセージを表示部５０に表示させる。このとき表示される警告メッセージは、洗浄装置１０の洗浄能力の回復を強く促すことを警告するものであり、オペレーターは警告メッセージを見て洗浄装置１０の洗浄能力が著しく低下していることを認識する。そして、洗浄能力の著しい低下を認識したオペレーターは、洗浄能力を回復させる洗浄装置１０のメンテナンスを開始する。例えば電解洗浄における電解電流を大きくしたり、電解タンク１１への洗浄液の添加、鋼帯Ｓに対するブラシロールの押し付け力を大きくするといった作業を組み合わせたメンテナンスが行われる。 When the brightness difference is less than the brightness difference threshold A in the determination in step S103, the control unit 40 determines that the cleaning capability of the cleaning device 10 is significantly reduced, and a warning message that is an example of a notification display is displayed in step S104. It is displayed on the display unit 50. The warning message displayed at this time warns that the recovery of the cleaning capability of the cleaning apparatus 10 is strongly urged, and the operator recognizes that the cleaning capability of the cleaning apparatus 10 is significantly reduced by looking at the warning message. To do. And the operator who recognized the remarkable fall of cleaning capability starts the maintenance of the cleaning apparatus 10 which recovers cleaning capability. For example, maintenance combining operations such as increasing the electrolytic current in electrolytic cleaning, adding cleaning liquid to the electrolytic tank 11, and increasing the pressing force of the brush roll against the steel strip S is performed.

一方、ステップＳ１０３の判定において輝度差が輝度差閾値Ａ以上である場合、制御部４０はステップＳ１０５として輝度差と輝度差閾値Ｂとの対比を行い、どちらの値が大きいか判定する。 On the other hand, when the luminance difference is equal to or larger than the luminance difference threshold A in the determination in step S103, the control unit 40 compares the luminance difference and the luminance difference threshold B in step S105 to determine which value is larger.

ステップＳ１０５の判定において輝度差が輝度差閾値Ｂ以上である場合、制御部４０は、洗浄装置１０の洗浄能力が十分発揮されていると判断し、洗浄能力評価を終了する。 When the luminance difference is equal to or larger than the luminance difference threshold B in the determination in step S105, the control unit 40 determines that the cleaning capability of the cleaning device 10 is sufficiently exhibited, and ends the cleaning capability evaluation.

一方、ステップＳ１０５の判定において輝度差が輝度差閾値Ｂを下回った場合、制御部４０は洗浄装置１０の洗浄能力がやや低下していると判断し、ステップＳ１０６として表示部５０に注意喚起メッセージを表示させる。このとき表示される注意喚起メッセージは、ステップＳ１０４で表示されるような警告メッセージではなく、洗浄装置１０の洗浄能力が低下し始めていることを知らせるものである。オペレーターはその注意喚起メッセージを見て、洗浄能力がやや低下していることを認識し、洗浄能力を回復させる洗浄装置１０のメンテナンスを実施する。なお、ステップＳ１０６のメッセージが表示される場合は、ステップＳ１０４のメッセージが表示される場合よりも洗浄装置１０の洗浄能力が低下しておらず、緊急性が低いため、オペレーターは電解洗浄における電解電流の調節や、電解タンク１１への洗浄液の添加による電解液濃度の調節、あるいは鋼帯Ｓに対するブラシロールの押し付け力の調節等の作業のうち、いずれか１つの作業のみを実施することにしても良い。 On the other hand, when the brightness difference is less than the brightness difference threshold B in the determination in step S105, the control unit 40 determines that the cleaning capability of the cleaning device 10 is slightly reduced, and displays a warning message on the display unit 50 in step S106. Display. The alert message displayed at this time is not a warning message as displayed in step S104, but informs that the cleaning capability of the cleaning apparatus 10 is starting to decrease. The operator sees the warning message and recognizes that the cleaning ability is slightly reduced, and performs maintenance of the cleaning apparatus 10 to restore the cleaning ability. Note that when the message of step S106 is displayed, the cleaning capability of the cleaning apparatus 10 is not lowered and less urgent than when the message of step S104 is displayed. It is also possible to carry out only one of the adjustment, adjustment of the electrolyte concentration by adding the cleaning solution to the electrolytic tank 11, or adjustment of the pressing force of the brush roll against the steel strip S. good.

以上のように第２の実施形態に係る洗浄設備１では、洗浄装置１０の洗浄能力評価に用いられる輝度差閾値を２つ設定していることで、洗浄装置１０の洗浄能力の低下状況をより詳細に把握することが可能となる。これにより、洗浄装置１０が現に有する洗浄能力に応じて、内容の異なるメンテナンスを実施することも可能となり、操業の自由度が向上する。 As described above, in the cleaning facility 1 according to the second embodiment, the two brightness difference threshold values used for the cleaning performance evaluation of the cleaning device 10 are set, thereby further reducing the cleaning performance of the cleaning device 10. It becomes possible to grasp in detail. This makes it possible to carry out maintenance with different contents according to the cleaning capability of the cleaning apparatus 10 and improves the degree of freedom of operation.

なお、第２の実施形態では、輝度差閾値を２つ設定することとしたが、輝度差閾値の数はこれに限定されない。即ち、制御部４０に輝度差閾値が複数設定され、当該制御部４０が輝度差と輝度差閾値の関係に応じて、内容の異なる通知表示を表示部５０に表示させるように構成されていれば、第２の実施形態で説明した効果を享受することができる。 In the second embodiment, two brightness difference threshold values are set, but the number of brightness difference threshold values is not limited to this. That is, if a plurality of brightness difference thresholds are set in the control unit 40 and the control unit 40 is configured to display notification displays having different contents on the display unit 50 according to the relationship between the brightness difference and the brightness difference threshold. The effects described in the second embodiment can be enjoyed.

（第３の実施形態）
洗浄装置１０の洗浄能力を十分に発揮できたとしても洗浄装置１０の洗浄能力には限界があることから、洗浄前の段階でそれほど汚れていない鋼帯Ｓを洗浄する場合の洗浄効果は、洗浄前の段階で酷く汚れている鋼帯Ｓを洗浄する場合に比べて小さくなる。即ち、洗浄前の段階でそれほど汚れていない鋼帯Ｓを洗浄する場合には、出側輝度と入側輝度の輝度差が小さくなる傾向にある。このため、輝度差のみに着目した洗浄能力評価を行うと、洗浄前の鋼帯Ｓがそれほど汚れていない場合において輝度差が小さく算出されることによって、洗浄装置１０が十分な洗浄能力を有しているにも関わらず制御部４０により洗浄装置１０の洗浄能力が低下していると判定される。この場合、本来必要でないメンテナンスを実施してしまうことも考えられる。そこで、本発明の第３の実施形態に係る洗浄設備１は、洗浄装置１０の洗浄能力をより正確に評価することを可能にし、メンテナンス作業を適切なタイミングで行うことを可能にする。 (Third embodiment)
Even if the cleaning capability of the cleaning device 10 can be fully exhibited, the cleaning capability of the cleaning device 10 is limited. Therefore, the cleaning effect when cleaning the steel strip S that is not so dirty at the stage before cleaning is This is smaller than the case where the steel strip S that is heavily soiled in the previous stage is washed. That is, when cleaning the steel strip S that is not so dirty at the stage before cleaning, the difference in luminance between the outgoing luminance and the incoming luminance tends to be small. For this reason, when the cleaning capability evaluation focusing only on the luminance difference is performed, the cleaning device 10 has sufficient cleaning capability by calculating the luminance difference small when the steel strip S before cleaning is not very dirty. Nevertheless, it is determined by the control unit 40 that the cleaning capability of the cleaning device 10 has decreased. In this case, it may be possible to perform maintenance that is not necessary. Therefore, the cleaning facility 1 according to the third embodiment of the present invention makes it possible to more accurately evaluate the cleaning capability of the cleaning apparatus 10 and to perform maintenance work at an appropriate timing.

第３の実施形態に係る洗浄設備１は、図１に示す第１の実施形態に係る洗浄設備１と同様の構成を有しているが、第３の実施形態の制御部４０は、入側輝度と、入側輝度に関して予め設定された閾値（以下、「入側輝度閾値」という）との対比を行い、どちらの値が大きいか判定する機能を有している。なお、「入側輝度閾値」は、洗浄装置１０が本来有する最大の洗浄能力や、洗浄対象となり得る鋼帯Ｓの表面汚れの程度等を勘案して適宜決定される値である。入側輝度閾値は、例えば入側輝度が当該閾値以上になると、鋼帯Ｓの汚れの程度が小さいために十分な洗浄能力を有する洗浄装置１０であっても洗浄効果が小さくなるような値に設定される。なお、制御部４０への入側輝度閾値の設定は、例えばオペレーターが制御部４０として機能するパソコン等に直接入力することで設定されても良いし、鋼帯情報等の各種情報に基づいて制御部４０により算出された値が設定されても良い。 The cleaning facility 1 according to the third embodiment has the same configuration as the cleaning facility 1 according to the first embodiment shown in FIG. It has a function of comparing the luminance and a threshold value set in advance with respect to the incoming luminance (hereinafter referred to as “the incoming luminance threshold”) and determining which value is larger. The “entrance-side luminance threshold value” is a value that is appropriately determined in consideration of the maximum cleaning ability inherent in the cleaning apparatus 10, the degree of surface contamination of the steel strip S that can be cleaned, and the like. For example, when the incoming luminance is equal to or higher than the threshold, the incoming luminance threshold is set to such a value that the cleaning effect is reduced even with the cleaning device 10 having sufficient cleaning capability because the degree of contamination of the steel strip S is small. Is set. In addition, the setting of the entrance side luminance threshold value to the control unit 40 may be set, for example, by an operator directly inputting to a personal computer or the like functioning as the control unit 40, or controlled based on various information such as steel strip information. The value calculated by the unit 40 may be set.

以下、図４を用いて第３の実施形態に係る制御部４０の制御フローについて説明する。なお、以下の説明で示される符号のうち、図４に表記がない符号は図１に示されている。 Hereinafter, the control flow of the control unit 40 according to the third embodiment will be described with reference to FIG. Of the reference numerals shown in the following description, reference numerals not shown in FIG. 4 are shown in FIG.

まず、図４に示すステップＳ１０１〜ステップＳ１０３では、制御部４０は第１の実施形態におけるステップＳ１０１〜ステップＳ１０３と同様の制御を行う。 First, in step S101 to step S103 shown in FIG. 4, the control unit 40 performs the same control as step S101 to step S103 in the first embodiment.

ステップＳ１０３の判定において輝度差が輝度差閾値以上である場合、制御部４０は洗浄装置１０の洗浄能力が十分発揮されていると判断し、洗浄能力評価を終了する。一方、ステップＳ１０３の判定において輝度差が輝度差閾値未満である場合、制御部４０はステップＳ１０７として、入側輝度と入側輝度閾値とを対比し、どちらの値が大きいか判定する。 When the brightness difference is equal to or greater than the brightness difference threshold value in the determination in step S103, the control unit 40 determines that the cleaning capability of the cleaning device 10 is sufficiently exhibited, and ends the cleaning capability evaluation. On the other hand, when the luminance difference is less than the luminance difference threshold in the determination in step S103, the control unit 40 compares the incoming luminance with the incoming luminance threshold in step S107, and determines which value is larger.

ステップＳ１０７の判定において入側輝度が入側輝度閾値以上である場合、制御部４０は、洗浄中の鋼帯Ｓが洗浄前からそれほど汚れていないためにステップＳ１０３において輝度差が小さくなったと判断し、洗浄能力評価を終了する。 When the incoming luminance is equal to or greater than the incoming luminance threshold in the determination in step S107, the control unit 40 determines that the luminance difference has decreased in step S103 because the steel strip S being cleaned is not so dirty before cleaning. The cleaning ability evaluation is completed.

一方、ステップＳ１０７の判定において入側輝度が入側輝度閾値未満である場合、制御部４０は、洗浄装置１０の洗浄能力が低下していると判断し、ステップＳ１０８として表示部５０に警告メッセージを表示させる。このとき表示される警告メッセージによってオペレーターは洗浄装置１０の洗浄能力が低下していることを認識し、洗浄能力を回復させる洗浄装置１０のメンテナンスを行う。 On the other hand, if the incoming luminance is less than the incoming luminance threshold in the determination in step S107, the control unit 40 determines that the cleaning capability of the cleaning device 10 has decreased, and displays a warning message on the display unit 50 as step S108. Display. The operator recognizes that the cleaning capability of the cleaning device 10 is reduced by the warning message displayed at this time, and performs maintenance of the cleaning device 10 to restore the cleaning capability.

以上のように第３の実施形態における洗浄設備１では、制御部４０が入側輝度と入側輝度閾値との対比判定を行う機能を有しているため、洗浄前の鋼帯Ｓの汚れの程度を考慮した上で洗浄装置１０の洗浄能力評価を行うことが可能になる。これにより、洗浄装置１０のメンテナンスが実際に必要なタイミングで適切に洗浄装置１０のメンテナンスを実施することができる。 As described above, in the cleaning facility 1 according to the third embodiment, the control unit 40 has a function of performing the comparison determination between the incoming luminance and the incoming luminance threshold, so that the contamination of the steel strip S before cleaning is reduced. It is possible to evaluate the cleaning capability of the cleaning device 10 in consideration of the degree. Thereby, the maintenance of the cleaning apparatus 10 can be appropriately performed at a timing when the maintenance of the cleaning apparatus 10 is actually necessary.

なお、第３の実施形態の説明では、輝度差閾値を１つ設定することとしたが、輝度差閾値は、図３に示す第２の実施形態で説明したように複数設けても良い。例えば図３に示すステップＳ１０３とステップＳ１０４の間、および、ステップＳ１０５とステップＳ１０６の間でそれぞれ図４に示すステップＳ１０７を実行するような制御を行えば、第２の実施形態で説明した効果と第３の実施形態で説明した効果を組み合わせた効果を享受することができる。 In the description of the third embodiment, one luminance difference threshold value is set. However, a plurality of luminance difference threshold values may be provided as described in the second embodiment shown in FIG. For example, if control is performed to execute step S107 shown in FIG. 4 between step S103 and step S104 shown in FIG. 3 and between step S105 and step S106, the effects described in the second embodiment are obtained. The effect which combined the effect demonstrated in 3rd Embodiment can be enjoyed.

以上、本発明の好適な実施形態について説明したが、本発明はかかる例に限定されない。当業者であれば、特許請求の範囲に記載された技術的思想の範疇内において、各種の変更例または修正例に想到しうることは明らかであり、それらについても当然に本発明の技術的範囲に属するものと了解される。 As mentioned above, although preferred embodiment of this invention was described, this invention is not limited to this example. It is obvious for those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea described in the claims. It is understood that it belongs to.

例えば、上記第１〜第３の実施形態では洗浄装置１０を電解タンク１１、ブラシスクラバー１２、リンスタンク１３、ドライヤー１４で構成することとしたが、洗浄装置１０の構成はこれに限定されない。 For example, in the first to third embodiments, the cleaning device 10 is configured by the electrolytic tank 11, the brush scrubber 12, the rinse tank 13, and the dryer 14, but the configuration of the cleaning device 10 is not limited to this.

また、上記第１〜第３の実施形態では、洗浄装置１０の入側および出側で鋼帯Ｓの輝度を測定するために、測定した輝度を制御部４０に出力する輝度計を用いたが、輝度計を用いずに鋼帯Ｓの輝度を測定しても良い。例えば洗浄装置１０の入側および出側に鋼帯表面を撮像する撮像装置をそれぞれ配置し、各撮像装置で撮像された画像を任意の制御部に送信して当該制御部で画像処理することで鋼帯Ｓの輝度を測定しても良い。ここでいう制御部は、図１に示す制御部４０であっても良いし、図１に示す制御部４０とは異なる他の制御部（図示省略）であっても良い。即ち、洗浄装置１０の入側に鋼帯表面の輝度を測定する輝度測定装置（入側輝度測定装置）が設けられ、同様に洗浄装置１０の出側に鋼帯表面の輝度を測定する輝度測定装置（出側輝度測定装置）が設けられていれば、上記第１〜第３の実施形態で説明した効果を享受することができる。 Moreover, in the said 1st-3rd embodiment, in order to measure the brightness | luminance of the steel strip S by the entrance side and exit side of the washing | cleaning apparatus 10, the luminance meter which outputs the measured brightness | luminance to the control part 40 was used. The brightness of the steel strip S may be measured without using a brightness meter. For example, an image pickup device that picks up the steel strip surface is arranged on the entry side and the exit side of the cleaning device 10, respectively, and an image picked up by each image pickup device is transmitted to an arbitrary control unit, and image processing is performed by the control unit. The brightness of the steel strip S may be measured. The control unit referred to here may be the control unit 40 shown in FIG. 1, or may be another control unit (not shown) different from the control unit 40 shown in FIG. That is, a luminance measuring device (incoming side luminance measuring device) for measuring the luminance of the steel strip surface is provided on the entry side of the cleaning device 10, and similarly, a luminance measurement for measuring the luminance of the steel strip surface on the outlet side of the cleaning device 10. If an apparatus (exit luminance measurement apparatus) is provided, the effects described in the first to third embodiments can be enjoyed.

また、洗浄装置１０のメンテナンスは、オペレーターの操作により開始されても良いし、制御部４０により自動開始されても良い。制御部４０で自動的にメンテナンスを開始する場合、表示部５０には例えば“メンテナンス開始”といった洗浄装置１０のメンテナンス動作が開始された旨の通知メッセージが表示される。 Further, the maintenance of the cleaning device 10 may be started by an operator's operation, or may be automatically started by the control unit 40. When the control unit 40 automatically starts the maintenance, the display unit 50 displays a notification message indicating that the maintenance operation of the cleaning apparatus 10 has started, for example, “maintenance start”.

輝度差閾値としての好ましい値を求めるため、図１に示す構成の洗浄設備を用いて冷延鋼帯の洗浄を実施し、洗浄装置の入側と出側における鋼帯表面の輝度を測定した。輝度の測定条件は次の通りである。管長２５００ｍｍ、１５０Ｗの蛍光灯を長手方向が鋼帯の幅方向に沿うように鋼帯表面から１〜３ｍ離した位置に設置し、洗浄装置の入側および出側に配置する輝度計として株式会社キーエンス製ＣＶ−２５００を使用した。各輝度計は、測定範囲が鋼帯の中央部となるように設置され、各輝度計で測定される輝度測定値は１秒毎に出力される設定とした。なお、本実施例では洗浄能力が低下していない洗浄装置を用いて鋼帯の洗浄を実施している。 In order to obtain a preferable value as the brightness difference threshold value, the cold rolled steel strip was cleaned using the cleaning equipment having the configuration shown in FIG. 1, and the brightness of the steel strip surface on the entry side and the exit side of the cleaning device was measured. The measurement conditions for luminance are as follows. As a luminance meter, a fluorescent lamp with a tube length of 2500 mm and 150 W is installed at a position 1 to 3 m away from the surface of the steel strip so that its longitudinal direction is along the width direction of the steel strip, and placed on the entry side and the exit side of the cleaning device. Keyence CV-2500 was used. Each luminance meter was installed so that the measurement range would be the center of the steel strip, and the luminance measurement value measured by each luminance meter was set to be output every second. In the present embodiment, the steel strip is cleaned using a cleaning device in which the cleaning capability is not reduced.

上記測定条件で測定された輝度測定値を用いて、出側輝度を横軸、出側輝度と入側輝度の輝度差を縦軸として図５に鋼帯品質との関係をグラフ化した。なお、図５では、出側輝度と鋼帯の洗浄度との関係から得られる鋼帯品質に影響を与える閾値（以下、「出側輝度閾値」という）を図示している。上記測定条件の下で導かれる出側輝度閾値は５０ｃｄ／ｍ^２と４０ｃｄ／ｍ^２である。出側輝度が５０ｃｄ／ｍ^２以上の鋼帯は電清不良欠陥が発生せず、品質に関して特段問題がない安全領域にある鋼帯である。出側輝度が４０ｃｄ／ｍ^２以上、５０ｃｄ／ｍ^２未満の鋼帯は、外観厳格材などの自動車用外板材としての使用は好ましくないが、他の用途においては特段問題がなく、品質に関して注意を要する注意領域にある鋼帯である。出側輝度が４０ｃｄ／ｍ^２未満の鋼帯は電清不良欠陥が発生し、品質に関して著しく劣る警告領域にある鋼帯である。 Using the measured luminance values measured under the above measurement conditions, the relationship between the strip quality and the outgoing side luminance is plotted on the horizontal axis, and the luminance difference between the outgoing side luminance and the incoming side luminance is plotted on the vertical axis. Note that FIG. 5 illustrates thresholds (hereinafter referred to as “exit brightness thresholds”) that affect the steel strip quality obtained from the relationship between the exit brightness and the degree of cleaning of the steel strip. The outgoing luminance threshold values derived under the above measurement conditions are 50 cd / m ² and 40 cd / m ² . A steel strip having an outgoing luminance of 50 cd / m ² or more is a steel strip in a safe region in which no defect in electrocleaning occurs and there is no particular problem regarding quality. Steel strips with a brightness on the exit side of 40 cd / m ² or more and less than 50 cd / m ² are not preferred for use as automotive outer plate materials such as strict appearance materials, but there are no particular problems in other applications and attention is paid to quality. It is a steel strip in a caution area that requires. A steel strip having an outgoing luminance of less than 40 cd / m ² is a steel strip in a warning region in which defective defects are generated and the quality is remarkably inferior.

図５に示すように出側輝度と入側輝度の輝度差が小さくなりすぎた場合には、鋼帯が十分に洗浄されず、品質に関して安全領域にあった鋼帯が注意領域あるいは警告領域に移動してしまうことが想定される。本実施例の結果を考慮すると、鋼帯表面の汚れの程度に関わらず良好な洗浄品質を維持することが可能な好ましい輝度差閾値は、１８ｃｄ／ｍ^２であることがわかる。 As shown in FIG. 5, when the brightness difference between the exit side brightness and the entrance side brightness becomes too small, the steel strip is not sufficiently cleaned, and the steel strip that is in the safety area in terms of quality becomes the caution area or the warning area. It is assumed that it will move. Considering the result of this example, it can be seen that a preferable luminance difference threshold value capable of maintaining good cleaning quality regardless of the degree of contamination on the surface of the steel strip is 18 cd / m ² .

即ち、輝度差が１８ｃｄ／ｍ^２未満となった場合は、洗浄能力を回復させる洗浄装置のメンテナンスを実施することで鋼帯の洗浄品質を良好に保つことが可能となる。また、輝度差が更に小さくなり、１０ｃｄ／ｍ^２未満となるような場合は鋼帯の洗浄品質が著しく劣ることになるため、電解電流の増大や電解タンクへの洗浄液の添加等の複数の作業を組み合わせたメンテナンスを行うことが好ましい。 That is, when the brightness difference is less than 18 cd / m ² , it is possible to maintain a good cleaning quality of the steel strip by performing maintenance of the cleaning device that restores the cleaning ability. In addition, when the brightness difference is further reduced and becomes less than 10 cd / m ² , the cleaning quality of the steel strip will be remarkably inferior, so that a plurality of operations such as an increase in electrolysis current and the addition of a cleaning solution to the electrolytic tank are performed. It is preferable to perform maintenance in combination.

本発明は、連続焼鈍ラインにおいて冷延鋼帯を洗浄する際に適用することができる。 The present invention can be applied when cleaning a cold-rolled steel strip in a continuous annealing line.

１洗浄設備
１０洗浄装置
１１電解タンク
１２ブラシスクラバー
１３リンスタンク
１４ドライヤー
２０入側輝度計
３０出側輝度計
４０制御部
５０表示部
８０ルーパー
Ｓ冷延鋼帯
Ｔ走行方向 DESCRIPTION OF SYMBOLS 1 Cleaning equipment 10 Cleaning apparatus 11 Electrolytic tank 12 Brush scrubber 13 Rinse tank 14 Dryer 20 Incoming luminance meter 30 Outlet luminance meter 40 Control part 50 Display part 80 Looper S Cold-rolled steel strip T Running direction

Claims

A cleaning device for cleaning the cold-rolled steel strip traveling;
An entrance-side brightness measuring device that measures the brightness of the surface of the cold-rolled steel strip on the entrance side of the cleaning device;
An exit-side brightness measuring device that measures the brightness of the surface of the cold-rolled steel strip on the exit side of the cleaning device;
A controller that calculates a luminance difference between the incoming luminance obtained by the incoming luminance measuring device and the outgoing luminance obtained by the outgoing luminance measuring device;
The controller is
Contrast the brightness difference with a preset brightness difference threshold,
When the brightness difference is less than the brightness difference threshold, the cold rolled steel strip cleaning equipment is configured to display a notification display on the display unit indicating that the cleaning capability of the cleaning device is reduced. .

A plurality of the brightness difference thresholds are set in the control unit, and the control unit is configured to display the notification display different on the display unit according to the relationship between each brightness difference threshold and the brightness difference. The cold-rolled steel strip cleaning equipment according to claim 1.

The controller is
When the luminance difference is less than the luminance difference threshold, the incoming luminance is compared with a preset incoming luminance threshold;
The cold rolled steel strip cleaning facility according to claim 1 or 2, wherein the notification display is displayed on the display unit when the incoming luminance is less than the incoming luminance threshold.

Measure the brightness of the surface of the cold-rolled steel strip on the inlet side and the outlet side of the cleaning device for cleaning the cold-rolled steel strip traveling,
Calculating the luminance difference between the incoming luminance measured on the inlet side of the cleaning device and the outgoing luminance measured on the outlet side of the cleaning device;
A method for cleaning a cold-rolled steel strip, wherein the brightness difference is compared with a preset brightness difference threshold, and maintenance is performed to restore the cleaning performance of the cleaning device when the brightness difference is less than the brightness difference threshold.

5. The cold rolled steel strip according to claim 4, wherein the plurality of brightness difference threshold values are set, and the maintenance of the different contents is performed according to the relationship between each brightness difference threshold value and the brightness difference when the maintenance is performed. Cleaning method.

When the luminance difference is less than the luminance difference threshold, the incoming luminance is compared with a preset incoming luminance threshold;
The method for cleaning a cold-rolled steel strip according to claim 4 or 5, wherein the maintenance is performed when the incoming luminance is less than the incoming luminance threshold.