JP5983638B2 - Steel plate cleaning equipment - Google Patents

Steel plate cleaning equipment Download PDF

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JP5983638B2
JP5983638B2 JP2014004202A JP2014004202A JP5983638B2 JP 5983638 B2 JP5983638 B2 JP 5983638B2 JP 2014004202 A JP2014004202 A JP 2014004202A JP 2014004202 A JP2014004202 A JP 2014004202A JP 5983638 B2 JP5983638 B2 JP 5983638B2
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steel plate
air
flow
guide plate
steel
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JP2015131274A (en
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和也 瀬尾
和也 瀬尾
今関　敏夫
敏夫 今関
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JFE Steel Corp
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本発明は、種々の鋼板を製造する過程で圧延、熱処理、めっき等の様々な加工処理を施す各種設備（以下、鋼板の製造設備という）にて、鋼板を搬送しながら洗浄する装置に関するものである。   The present invention relates to an apparatus for cleaning while transporting a steel sheet in various facilities (hereinafter referred to as a steel sheet manufacturing facility) for performing various processing processes such as rolling, heat treatment, and plating in the course of manufacturing various steel sheets. is there.

製鉄所等にて種々の鋼板を製造する際には、鋼板の仕様や用途に応じた製造設備に順次搬送され、様々な加工処理が施される。ところが鋼板の製造設備では、加工処理を施す間に、鋼板の表面に異物が付着し易く、その異物が鋼板の製造に悪影響を及ぼすという問題がある。たとえば、圧延設備では圧延油や鉄粉等、熱処理設備ではスケール等、めっき設備ではスラッジ等が異物として鋼板の表面に付着する。   When various steel plates are manufactured at a steel mill or the like, they are sequentially transported to a manufacturing facility according to the specifications and applications of the steel plates and subjected to various processing treatments. However, in the steel plate manufacturing facility, there is a problem that foreign matters are likely to adhere to the surface of the steel plate during the processing, and the foreign matters adversely affect the production of the steel plate. For example, rolling oil or iron powder adheres to the surface of the steel sheet as a foreign substance in the rolling equipment, scale, etc. in the heat treatment equipment, and sludge etc. in the plating equipment.

鋼板に異物が付着すると、その後に搬送される製造設備の稼働に支障をきたすばかりでなく、鋼板の品質を劣化させる原因になる。つまり異物は、鋼板の生産性低下のみならず歩留り低下を招くので、鋼板に付着した異物を除去する技術が検討されている。
たとえば、鋼板に異物が付着した製造設備の出側でその鋼板を取り出して（いわゆるオフライン）、異物を除去した後に、後工程の製造設備に搬入すれば、鋼板の歩留り低下を防止することは可能である。しかし、鋼板の生産性低下は防止できない。 If foreign matter adheres to the steel sheet, it not only hinders the operation of the manufacturing equipment that is transported thereafter, but also causes the quality of the steel sheet to deteriorate. That is, the foreign matter causes not only a reduction in the productivity of the steel sheet but also a decrease in the yield, so a technique for removing the foreign matter adhering to the steel sheet has been studied.
For example, if the steel sheet is taken out from the production facility where foreign matter has adhered to the steel plate (so-called off-line) and removed, and then transferred to the production facility in the subsequent process, it is possible to prevent the yield of the steel plate from decreasing. It is. However, it is impossible to prevent a reduction in the productivity of the steel sheet.

そこで、鋼板に付着した異物を除去するにあたって、鋼板の歩留り低下の防止および生産性低下の防止を両立させる技術が求められている。
特許文献１には、圧延設備で鋼板に付着した圧延油や鉄粉を除去する技術が開示されている。この技術は、鋼板に水蒸気、空気、洗浄剤を混合して吹き付けることによって、異物を除去する技術である。その吹き付け方向の説明は記載されていないが、特許文献１の図１によれば、吹き付け方向は鋼板に対して垂直に設定されている。そのため、特許文献１に開示された技術を鋼板の製造設備に適用して、搬送中の鋼板（いわゆるオンライン）を洗浄すれば、鋼板に衝突した空気とともに水蒸気や洗浄剤が周辺に飛散して、それらの飛沫や除去された異物の破片が鋼板の表面や周辺の機器に付着するという問題が生じる。とりわけ、搬送速度が高速である場合や鋼板が薄い場合には、吹き付けによって生じる衝突力が、鋼板の振動や変形、もしくは鋼板温度の不均一な分布を引き起こす。 Therefore, when removing the foreign matter adhering to the steel plate, a technology that achieves both prevention of the yield reduction and productivity reduction of the steel plate is required.
Patent Document 1 discloses a technique for removing rolling oil and iron powder adhering to a steel plate with rolling equipment. This technique is a technique for removing foreign substances by mixing and spraying water vapor, air, and a cleaning agent on a steel plate. Although description of the spraying direction is not described, according to FIG. 1 of Patent Document 1, the spraying direction is set perpendicular to the steel plate. Therefore, if the technology disclosed in Patent Document 1 is applied to a steel sheet manufacturing facility and the steel sheet being transported (so-called online) is cleaned, water vapor and a cleaning agent are scattered around the air colliding with the steel sheet, There arises a problem that these splashes and removed foreign matter debris adhere to the surface of the steel sheet and peripheral equipment. In particular, when the conveyance speed is high or the steel plate is thin, the collision force generated by spraying causes vibration and deformation of the steel plate or uneven distribution of the steel plate temperature.

特許文献２には、溶融めっき設備で鋼板に付着した余剰の溶融金属を払拭する技術が開示されている。この技術は、鋼板に空気を吹き付けることによって、めっき付着量を制御する技術である。その吹き付け方向の説明は記載されていないが、特許文献２の図１によれば、吹き付け方向は鋼板に対して垂直に設定されている。そのため特許文献２に開示された技術を、鋼板の製造設備におけるオンラインの異物除去に適用すれば、特許文献１の技術と同様に、除去された異物の破片が鋼板の表面や周辺の機器に付着するという問題、あるいは、鋼板の振動や変形、もしくは鋼板温度の不均一な分布が発生するという問題がある。   Patent Document 2 discloses a technique for wiping off excess molten metal adhering to a steel plate in a hot dipping facility. This technique is a technique for controlling the amount of plating applied by blowing air onto a steel sheet. Although description of the spraying direction is not described, according to FIG. 1 of Patent Document 2, the spraying direction is set perpendicular to the steel plate. Therefore, if the technique disclosed in Patent Document 2 is applied to online foreign matter removal in a steel sheet manufacturing facility, the removed foreign substance fragments adhere to the surface of the steel sheet and peripheral equipment, as in the technique of Patent Document 1. Or a vibration or deformation of the steel plate or a non-uniform distribution of the steel plate temperature.

特許文献２には、鋼板の振動を防止するための直流磁場印加装置やエアクッションが開示されているが、これの機器をオンラインの異物除去に導入すると、異物除去に要するコストの上昇を招く。しかも、鋼板の振動を防止することは可能であるが、異物の破片が付着する、あるいは温度が局所的に変動するという問題は解決できない。
また図４に示すように、吹き付ける空気４（以下、噴射空気流という）を鋼板１の搬送方向の上流側へ傾斜させて、異物２を除去する技術も検討されている。しかし、噴射空気流４の噴射方向を傾斜させても、その運動エネルギが鋼板１に対して垂直に作用するのは避けられないので、鋼板の振動や変形、もしくは鋼板温度の不均一な分布が発生するという問題を防止できない。 Patent Document 2 discloses a DC magnetic field application device and an air cushion for preventing vibration of a steel plate. However, when these devices are introduced for online foreign matter removal, the cost required for foreign matter removal increases. Moreover, although it is possible to prevent the vibration of the steel sheet, the problem that foreign matter fragments adhere or the temperature fluctuates locally cannot be solved.
In addition, as shown in FIG. 4, a technique for removing foreign matter 2 by inclining air 4 to be blown (hereinafter referred to as a jet air flow) to the upstream side in the conveying direction of the steel sheet 1 has been studied. However, even if the jet direction of the jet air flow 4 is tilted, it is inevitable that the kinetic energy acts perpendicularly to the steel plate 1, so that the vibration and deformation of the steel plate or the uneven distribution of the steel plate temperature may occur. The problem of occurring cannot be prevented.

特開2010-100900号公報JP 2010-100900 特開2002-275614号公報JP 2002-275614 A

本発明は、従来の技術の問題点を解消し、鋼板の製造設備にて、鋼板の搬送中に簡便な手段で異物の除去行ない、しかも除去した異物が鋼板の表面や周辺の機器に付着するのを防止し、かつ鋼板が振動や変形するのを防止するとともに、鋼板の温度が局所的に変動するのを防止することができる洗浄装置を提供することを目的とする。   The present invention eliminates the problems of the prior art, removes foreign matter by a simple means during transport of the steel sheet in the steel sheet manufacturing facility, and the removed foreign matter adheres to the surface of the steel sheet and surrounding equipment. An object of the present invention is to provide a cleaning device that can prevent the steel plate from vibrating and deforming, and can prevent the temperature of the steel plate from fluctuating locally.

本発明者は、洗浄剤や水蒸気の飛沫の付着を防止するために、洗浄剤や水蒸気を使用せず、空気のみを吹き付けて、搬送中の鋼板から異物を除去する技術を検討した。そして、鋼板の搬送方向の上流側へ向かう水平な空気の流れ（以下、水平流という）を発生させ、かつ周囲から空気を巻き込む流れ（以下、誘引流という）も生じさせるガイド部材（以下、空気誘導板という）を用いることによって、異物を上流側へ押し戻すことができ、その結果、異物の破片が鋼板の表面や周辺の機器に付着するのを防止できることを見出した。   The present inventor examined a technique for removing foreign substances from a steel sheet being transported by spraying only air without using a cleaning agent or water vapor in order to prevent adhesion of a cleaning agent or water vapor. And a guide member (hereinafter referred to as air) that generates a flow of horizontal air (hereinafter referred to as horizontal flow) toward the upstream side in the conveyance direction of the steel sheet and also generates a flow of entraining air from the surroundings (hereinafter referred to as induced flow). By using a guide plate), it was found that foreign matter can be pushed back to the upstream side, and as a result, it is possible to prevent debris from adhering to the surface of the steel plate and peripheral equipment.

このようにしてオンラインで異物を除去することによって、鋼板の歩留り低下の防止および生産性低下の防止を両立できることが分かった。本発明は、このような知見に基づいてなされたものである。
すなわち本発明は、鋼板の製造設備にて搬送中の鋼板を洗浄する洗浄装置であって、鋼板の上方に空気誘導板を配設し、空気誘導板が、その前端部には鋼板に対して平行な水平流形成部を有し、かつ後端部には鋼板との距離を水平流形成部よりも広げた誘引流形成部を有するとともに、誘引流形成部の上面に空気を吹き付けるノズルを空気誘導板の上方に配設する洗浄装置である。 Thus, it has been found that by removing foreign matter online, it is possible to achieve both prevention of steel sheet yield reduction and productivity reduction. The present invention has been made based on such knowledge.
That is, the present invention is a cleaning device for cleaning a steel plate being transported in a steel plate manufacturing facility, wherein an air guide plate is disposed above the steel plate, and the air guide plate has a front end portion with respect to the steel plate. It has a parallel horizontal flow forming portion, and has a suction flow forming portion whose distance from the steel plate is wider than that of the horizontal flow forming portion at the rear end, and a nozzle that blows air on the top surface of the attractive flow forming portion. This is a cleaning device disposed above the guide plate.

本発明の洗浄装置においては、鋼板と空気誘導板との距離を調整する誘導板高さ調整機構を有することが好ましい。また、空気誘導板の上流側かつ鋼板の上方に空気の上昇流を回収する空気吸引機構を有することが好ましい。   In the cleaning apparatus of the present invention, it is preferable to have a guide plate height adjusting mechanism for adjusting the distance between the steel plate and the air guide plate. Moreover, it is preferable to have an air suction mechanism that collects an upward flow of air upstream of the air guide plate and above the steel plate.

本発明によれば、鋼板の製造設備にて、鋼板の搬送中に簡便な手段で異物の除去を行ない、しかも除去した異物が鋼板の表面や周辺の機器に付着するのを防止し、かつ鋼板が振動や変形するのを防止するとともに、鋼板の温度が局所的に変動するのを防止することができる。その結果、鋼板の歩留り低下の防止および生産性低下の防止を両立させることが可能となり、産業上格段の効果を奏する。   According to the present invention, in a steel plate manufacturing facility, foreign matter is removed by a simple means during conveyance of the steel plate, and the removed foreign matter is prevented from adhering to the surface of the steel plate and peripheral equipment, and the steel plate. Can be prevented from vibrating and deforming, and the temperature of the steel sheet can be prevented from fluctuating locally. As a result, it becomes possible to achieve both the prevention of the decrease in the yield of the steel sheet and the prevention of the decrease in productivity, and has a remarkable industrial effect.

本発明の洗浄装置の例を模式的に示す断面図である。It is sectional drawing which shows the example of the washing | cleaning apparatus of this invention typically. 本発明の洗浄装置の他の例を模式的に示す断面図である。It is sectional drawing which shows the other example of the washing | cleaning apparatus of this invention typically. 図２中のＡ−Ａ矢視の断面図である。It is sectional drawing of the AA arrow in FIG. 従来の洗浄装置の例を模式的に示す断面図である。It is sectional drawing which shows the example of the conventional cleaning apparatus typically.

図１は、本発明の洗浄装置の例を模式的に示す断面図である。図１中の矢印ａは、鋼板１の搬送方向を示す。以下では、図１に示す左側を鋼板１の搬送方向の上流側と記す。したがって図１の右側が下流側となる。
本発明では、鋼板１の上方に空気誘導板６を配設し、その空気誘導板６の上面に噴射空気流４を吹き付ける。したがって、噴射空気流４と鋼板１との衝突を回避できるので、鋼板の振動や変形、もしくは鋼板温度の不均一な分布が発生するのを防止できる。 FIG. 1 is a cross-sectional view schematically showing an example of the cleaning apparatus of the present invention. An arrow a in FIG. 1 indicates the conveyance direction of the steel plate 1. Hereinafter, the left side shown in FIG. 1 is referred to as the upstream side in the conveying direction of the steel plate 1. Therefore, the right side of FIG. 1 is the downstream side.
In the present invention, the air guide plate 6 is disposed above the steel plate 1, and the jet air flow 4 is sprayed on the upper surface of the air guide plate 6. Therefore, since the collision between the jet air flow 4 and the steel plate 1 can be avoided, it is possible to prevent the vibration and deformation of the steel plate or the uneven distribution of the steel plate temperature.

空気誘導板６は、鋼板１の搬送方向の上流側の端部（以下、前端部という）に鋼板１に対して平行な部位6aを有し、下流側の端部（以下、後端部という）に鋼板１との距離が前端部より広がった部位6bを有する。図１には、空気誘導板６の後端部を傾斜させて平面とする例を示したが、後端部を湾曲した曲面としても良い。
そして噴射空気流４を、空気誘導板６の後端部の傾斜（あるいは湾曲）した部位6bの上面に吹き付ける。したがって噴射空気流４は、空気誘導板６の上面に沿って後端部から前端部へ流れる。この噴射空気流４の流れによって、周辺の空気が巻き込まれて、空気誘導板６と鋼板１との隙間に流れ込む空気流８（以下、誘引流という）が発生する。以下では空気誘導板６の後端部6bを誘引流形成部と記す。 The air guide plate 6 has a portion 6a parallel to the steel plate 1 at an upstream end (hereinafter referred to as a front end) in the conveying direction of the steel plate 1, and a downstream end (hereinafter referred to as a rear end). ) Has a portion 6b whose distance from the steel plate 1 is wider than the front end. Although FIG. 1 shows an example in which the rear end portion of the air guide plate 6 is inclined to form a flat surface, the rear end portion may be a curved surface.
Then, the jet air flow 4 is blown onto the upper surface of the inclined (or curved) portion 6b of the rear end portion of the air guide plate 6. Accordingly, the jet air flow 4 flows from the rear end portion to the front end portion along the upper surface of the air guide plate 6. Due to the flow of the jet air flow 4, ambient air is entrained, and an air flow 8 (hereinafter referred to as an induced flow) that flows into the gap between the air guide plate 6 and the steel plate 1 is generated. Hereinafter, the rear end portion 6b of the air guide plate 6 is referred to as an induction flow forming portion.

誘引流形成部6bを平面として傾斜させる場合には、誘引流形成部6bと水平面とのなす角αを０°＜α＜90°とすれば問題はないが、洗浄装置の小型化、および噴射空気流４の円滑化を図るために、30°≦α≦60°とすることが好ましく、40°≦α≦50°が一層好ましい。
誘引流形成部6bに吹き付ける噴射空気流４の角度は特に限定しない。噴射空気流４を鋼板１に対して垂直に吹き付けても、誘引流形成部6bの上面に沿って前端部へ流れて行き、その結果、誘引流８を発生させることが可能であるから問題はない。 When the induced flow forming portion 6b is inclined as a plane, there is no problem if the angle α formed between the induced flow forming portion 6b and the horizontal plane is 0 ° <α <90 °. In order to smooth the air flow 4, it is preferable to satisfy 30 ° ≦ α ≦ 60 °, and more preferably 40 ° ≦ α ≦ 50 °.
There is no particular limitation on the angle of the jet air flow 4 sprayed on the induced flow forming portion 6b. Even if the blast air stream 4 is blown perpendicularly to the steel sheet 1, it flows to the front end along the upper surface of the induced flow forming portion 6b, and as a result, the induced flow 8 can be generated. Absent.

また図１には、噴射空気流４を誘引流形成部6bに吹き付ける手段としてノズル３を示したが、プロペラを回転させる等の手段を用いて噴射空気流４を発生させることが可能である。
このようにして噴射空気流４は誘引流形成部6bの上面に沿って前端部へ流れて行き、誘引流８は空気誘導板６と鋼板１との隙間を通って前端部へ流れて行く。そして噴射空気流４と誘引流８が合流して、空気誘導板６の前端部から上流側へ向けて水平な空気流17（以下、水平流という）が発生する。以下では空気誘導板６の前端部6aを水平流形成部と記す。 In FIG. 1, the nozzle 3 is shown as a means for blowing the jet air flow 4 on the induced flow forming portion 6b. However, the jet air flow 4 can be generated using a means such as rotating a propeller.
In this way, the jet air flow 4 flows to the front end along the upper surface of the induced flow forming portion 6b, and the induced flow 8 flows to the front end through the gap between the air guide plate 6 and the steel plate 1. Then, the jet air flow 4 and the induced flow 8 merge to generate a horizontal air flow 17 (hereinafter referred to as a horizontal flow) from the front end portion of the air guide plate 6 toward the upstream side. Hereinafter, the front end portion 6a of the air guide plate 6 is referred to as a horizontal flow forming portion.

水平流17は、鋼板１の上面に沿って上流側へ流れて行き、異物２を上流側へ押し戻して除去する。ここで水平流17は上流側へ流れるので、除去した異物２を一定の方向へ移動させることが可能となり、鋼板１の表面や周辺の機器に付着し易くなるのを防止できる。
なお、水平流形成部6aに噴射空気流４を吹き付けると、誘引流８が発生しない。したがって噴射空気流４は、上記した通り、誘引流形成部6bに吹き付ける必要がある。つまり、ノズル３を空気誘導板６の上方に配設して、噴射空気流４を誘引流形成部6bの上面に吹き付ける。 The horizontal flow 17 flows upstream along the upper surface of the steel plate 1, and pushes the foreign matter 2 back to the upstream side for removal. Here, since the horizontal flow 17 flows upstream, it is possible to move the removed foreign matter 2 in a certain direction, and it is possible to prevent the foreign matter 2 from being easily attached to the surface of the steel plate 1 and peripheral equipment.
In addition, when the blast air flow 4 is sprayed on the horizontal flow formation part 6a, the induced flow 8 is not generated. Therefore, the jet air flow 4 needs to be sprayed to the induced flow forming part 6b as described above. That is, the nozzle 3 is disposed above the air guide plate 6 and the blast air flow 4 is sprayed onto the upper surface of the induced flow forming portion 6b.

図１に示す搬送ロール10、空気圧縮機11、流量調整弁12、空気配管13、ノズル角度調整機構14は特に限定せず、従来から知られている機器を使用する。
本発明では、水平流17で除去した後に上流側へ移動する異物２を回収するために、空気誘導板６の上流側に空気吸引機構７を設けることが好ましい（図２参照）。空気吸引機構７を設けることによって、空気とともに、異物２を回収することができる。さらに、空気吸引機構７と空気誘導板６の間にフード９を設置すれば、回収効率が向上するので好ましい。 The transport roll 10, the air compressor 11, the flow rate adjusting valve 12, the air pipe 13, and the nozzle angle adjusting mechanism 14 shown in FIG. 1 are not particularly limited, and conventionally known devices are used.
In the present invention, it is preferable to provide an air suction mechanism 7 on the upstream side of the air guide plate 6 in order to collect the foreign matter 2 that moves upstream after being removed by the horizontal flow 17 (see FIG. 2). By providing the air suction mechanism 7, the foreign matter 2 can be collected together with the air. Furthermore, it is preferable to install a hood 9 between the air suction mechanism 7 and the air guide plate 6 because recovery efficiency is improved.

空気吸引機構７は、図２に示すように、渦巻状の管体（以下、渦巻管という）を用いることが好ましい。渦巻管を空気吸引機構７として設置する場合は、その渦巻の中心部を図３に示すような構成とする。回収された空気は渦巻管内で減速し、異物の破片とともに異物回収管15を通って、排出口16から排出される。
ここで異物の破片が鋼板１に再び付着するのを防止ために、異物回収管15は搬送ロール10の下方まで延伸して、排出口16を搬送ロール10よりも低い位置に設けることが好ましい。 As shown in FIG. 2, the air suction mechanism 7 preferably uses a spiral tube (hereinafter referred to as a spiral tube). When the spiral tube is installed as the air suction mechanism 7, the central portion of the spiral is configured as shown in FIG. The recovered air is decelerated in the spiral tube, and is discharged from the discharge port 16 through the foreign material recovery tube 15 together with the foreign matter fragments.
Here, in order to prevent debris from adhering to the steel plate 1 again, it is preferable that the foreign material collection tube 15 extends to the lower side of the transport roll 10 and the discharge port 16 is provided at a position lower than the transport roll 10.

また、空気誘導板６と鋼板１との距離を調整するために、高さ調整機構５を設けることが好ましい。高さ調整機構５を設けることによって、フード９と空気誘導板６との隙間および鋼板１と空気誘導板６との隙間の寸法を調整でき、ひいては水平流17と誘引流８の流速を制御できる。
フード９と空気誘導板６（すなわち水平流形成部6a）との隙間の高さｄ0は0.1〜５mmの範囲内が好ましく、鋼板１と空気誘導板６（すなわち水平流形成部6a）との隙間の高さｄ2は１〜100mmの範囲内が好ましい。また、フード９と水平流形成部6aとの隙間を通過する噴射空気流４の流速をｖ0、鋼板１と水平流形成部6aとの隙間を通過する誘引流８の流速をｖ２とし、噴射空気流４と誘引流８が合流した水平流17の流速をｖ1、フード９と鋼板１との距離をｄ1とすると、物質保存則によって(1)式が成り立つ。さらに、空気密度をρ、流量をＱとすると、運動量保存則によって(2)式が成り立つ。そして(1)式と(2)式から(3)式が導かれる。
ｄ0×ｖ0＋ｄ2×ｖ2＝ｄ1×ｖ1 ・・・(1)
ρ×Ｑ×ｖ＝一定 ・・・(2)
ｖ2／ｖ0＝（（ｄ0×ｄ1）×0.5−ｄ0）／ｄ2 ・・・(3)
上記の(3)式を満足するように、噴射空気流４の流速ｖ0を流量調整弁12で調整することが好ましい。 In order to adjust the distance between the air guide plate 6 and the steel plate 1, it is preferable to provide the height adjusting mechanism 5. By providing the height adjusting mechanism 5, the dimensions of the gap between the hood 9 and the air guide plate 6 and the gap between the steel plate 1 and the air guide plate 6 can be adjusted, so that the flow velocity of the horizontal flow 17 and the induced flow 8 can be controlled. .
The height d 0 of the gap between the hood 9 and the air guide plate 6 (that is, the horizontal flow forming portion 6a) is preferably within a range of 0.1 to 5 mm, and the steel plate 1 and the air guide plate 6 (that is, the horizontal flow forming portion 6a) The gap height d 2 is preferably in the range of 1 to 100 mm. Further, the flow velocity of the jet air flow 4 passing through the gap between the hood 9 and the horizontal flow forming portion 6a is v 0 , and the flow velocity of the induced flow 8 passing through the gap between the steel plate 1 and the horizontal flow forming portion 6a is v 2 , When the flow velocity of the blast air flow 4 and the attractant flow 8 merges with the horizontal flow 17 v 1, the distance between the hood 9 and the steel sheet 1 and d 1, the material conservation law (1) is satisfied. Further, when the air density is ρ and the flow rate is Q, equation (2) is established according to the momentum conservation law. Then, equation (3) is derived from equations (1) and (2).
d 0 × v 0 + d 2 × v 2 = d 1 × v 1 (1)
ρ × Q × v = constant (2)
v 2 / v 0 = ((d 0 × d 1 ) × 0.5−d 0 ) / d 2 (3)
The flow velocity v 0 of the jet air flow 4 is preferably adjusted by the flow rate adjusting valve 12 so as to satisfy the above expression (3).

図２に示す洗浄装置を用いて、鋼板１に対して垂直な方向から、空気誘導板６の誘引流形成部6bに噴射空気流４を吹き付けて、鋼板１の洗浄を行なった。フード９と水平流形成部6aとの隙間の高さｄ0は0.5mm、フード９と鋼板１との距離ｄ1は13mm、鋼板１と水平流形成部6aとの隙間の高さｄ2を５mmとし、噴射空気流４のノズル３からの噴射圧は0.4MPaとした。平面で構成される誘引流形成部6bと水平面とのなす角αは45°とした。これを発明例とする。 The cleaning apparatus shown in FIG. 2 was used to clean the steel sheet 1 by spraying the jet air stream 4 onto the induced flow forming portion 6b of the air guide plate 6 from the direction perpendicular to the steel sheet 1. The height d 0 of the gap between the hood 9 and the horizontal flow forming portion 6a is 0.5 mm, the distance d 1 between the hood 9 and the steel plate 1 is 13 mm, and the height d 2 of the gap between the steel plate 1 and the horizontal flow forming portion 6a is The jet pressure from the nozzle 3 of the jet air flow 4 was 0.4 MPa. The angle α formed by the induced flow forming portion 6b constituted by a plane and the horizontal plane was 45 °. This is an invention example.

次に、図４に示すように、ノズル３を鋼板１に対して傾けて（傾斜角θ：30°）に向けて、鋼板１の洗浄を行なった。噴射空気流４の流量は７Nm3／min、ノズル３からの噴射圧は0.5MPaとした。これを比較例１とする。なお傾斜角θは、噴射空気流４の噴射方向と水平面とのなす角である。
また比較例１と同様に、ノズル３を鋼板１に対して傾けて（傾斜角θ：30°）に向けて、鋼板１の洗浄を行なった。噴射空気流４の流量は４Nm3／min、ノズル３からの噴射圧は0.3MPaとした。これを比較例２とする。 Next, as shown in FIG. 4, the steel plate 1 was cleaned with the nozzle 3 inclined toward the steel plate 1 (inclination angle θ: 30 °). The flow rate of the jet air stream 4 was 7 Nm 3 / min, and the jet pressure from the nozzle 3 was 0.5 MPa. This is referred to as Comparative Example 1. The inclination angle θ is an angle formed by the injection direction of the injection air flow 4 and the horizontal plane.
Further, in the same manner as in Comparative Example 1, the steel plate 1 was cleaned with the nozzle 3 inclined toward the steel plate 1 (inclination angle θ: 30 °). The flow rate of the jet air stream 4 was 4 Nm 3 / min, and the jet pressure from the nozzle 3 was 0.3 MPa. This is referred to as Comparative Example 2.

発明例は、傾斜角θを90°としているが、空気誘導板６を使用するので、鋼板１に飛沫が付着することはなく、鋼板１の振動や変形も発生しなかった。また、鋼板１の温度は均一に分布していた。
これに対して比較例１は、多量の飛沫が周辺に飛散して、鋼板１にも付着した。また、鋼板１の振動も発生した。比較例２は、飛沫が周辺に飛散しなかったが、鋼板１に付着するのが認められた。 In the example of the invention, the inclination angle θ is 90 °, but since the air guide plate 6 is used, the droplets do not adhere to the steel plate 1 and neither vibration nor deformation of the steel plate 1 occurs. Moreover, the temperature of the steel plate 1 was uniformly distributed.
On the other hand, in Comparative Example 1, a large amount of droplets scattered around and adhered to the steel plate 1. Moreover, the vibration of the steel plate 1 also occurred. In Comparative Example 2, it was confirmed that the droplets did not splash around, but adhered to the steel plate 1.

１ 鋼板
２ 異物
３ ノズル
４ 噴射空気流
５ 高さ調整機構
６ 空気誘導板
6a 水平流形成部
6b 誘引流形成部
７ 空気吸引機構
８ 誘引流
９ フード
10 搬送ロール
11 空気圧縮機
12 流量調整弁
13 空気配管
14 ノズル角度調整機構
15 異物回収管
16 排出口
17 水平流 DESCRIPTION OF SYMBOLS 1 Steel plate 2 Foreign material 3 Nozzle 4 Jet air flow 5 Height adjustment mechanism 6 Air guide plate
6a Horizontal flow forming section
6b Attracting flow forming part 7 Air suction mechanism 8 Attracting flow 9 Hood
10 Transport roll
11 Air compressor
12 Flow control valve
13 Air piping
14 Nozzle angle adjustment mechanism
15 Foreign material collection tube
16 outlet
17 Horizontal flow

Claims (3)

鋼板の製造設備にて搬送中の前記鋼板を洗浄する洗浄装置であって、前記鋼板の上方に空気誘導板を配設し、該空気誘導板が、その前端部には前記鋼板に対して平行な水平流形成部を有し、かつ後端部には前記鋼板との距離を前記水平流形成部よりも広げた誘引流形成部を有するとともに、該誘引流形成部の上面に空気を吹き付けるノズルを前記空気誘導板の上方に配設することを特徴とする鋼板の洗浄装置。   A cleaning device for cleaning the steel sheet being conveyed in a steel plate manufacturing facility, wherein an air guide plate is disposed above the steel plate, and the air guide plate is parallel to the steel plate at a front end portion thereof. A horizontal flow forming portion, and a rear end portion having an induced flow forming portion whose distance from the steel plate is larger than that of the horizontal flow forming portion, and a nozzle that blows air on the upper surface of the induced flow forming portion Is disposed above the air guide plate. 前記鋼板と前記空気誘導板との距離を調整する誘導板高さ調整機構を有することを特徴とする請求項１に記載の鋼板の洗浄装置。   The steel plate cleaning apparatus according to claim 1, further comprising a guide plate height adjusting mechanism that adjusts a distance between the steel plate and the air guide plate. 前記空気誘導板の上流側かつ前記鋼板の上方に前記空気の上昇流を回収する空気吸引機構を有することを特徴とする請求項２に記載の鋼板の洗浄装置。   The steel plate cleaning apparatus according to claim 2, further comprising an air suction mechanism that collects an upward flow of the air upstream of the air guide plate and above the steel plate.
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