JP3605457B2

JP3605457B2 - painting booth

Info

Publication number: JP3605457B2
Application number: JP29941195A
Authority: JP
Inventors: さと志堀沢
Original assignee: Taikisha Ltd
Current assignee: Taikisha Ltd
Priority date: 1995-11-17
Filing date: 1995-11-17
Publication date: 2004-12-22
Anticipated expiration: 2015-11-17
Also published as: JPH09141156A

Description

【０００１】
【発明の属する技術分野】
本発明は塗装ブースに関し、詳しくは、洗浄液を膜状形態で流下させる傾斜姿勢の洗浄液流下板を、吹き付け塗装作業域の下方に設け、この洗浄液流下板の下流端側に、前記作業域から余剰塗料ミストとともに排出される空気と、前記洗浄液流下板からの流下洗浄液とを合流状態で通過させる洗浄用排気流路を形成し、前記洗浄液流下板は、その断面形状において、下流端部に上流側の傾斜板部分の下流端縁から流下洗浄液を直接に流入させる洗浄液溜め用の溝部を有し、この溝部における前記洗浄用排気流路の側の溝壁をオーバーフローさせて溝部から前記洗浄用排気流路に洗浄液を流出させる構造とした塗装ブースに関する。
【０００２】
【従来の技術】
上記形式の塗装ブースは、洗浄液流下板の板上を膜状形態で流下させる洗浄液の洗い流し機能により、板上全面にわたる状態での塗料スラッジや落下塗料の堆積を防止して、洗浄液流下板に対する清掃メンテナンスの負担を軽減し、また、上流側での流下板幅方向における洗浄液供給ムラや流下板の製作誤差などに起因して、上記溝部への洗浄液流入に流下板幅方向での多少のムラがあったとしても、上記溝部での洗浄液貯留による液面均平化により、洗浄液を流下板幅方向に均一化した状態で溝部から洗浄用排気流路に流出させ得るようにして、洗浄用排気流路での塗料ミストの捕捉性能（すなわち、吹き付け塗装作業域からの排出空気に含まれる塗料ミストを洗浄用排気流路の通過過程で洗浄液により捕捉除去する機能）を高く確保できるようにしたものであり、この形式の塗装ブースは、特願平７−２１７０２６号により先に提案した。
【０００３】
【発明が解決しようとする課題】
しかし、上記の提案構造により、洗浄液流下板に対する清掃メンテナンスの負担軽減、及び、洗浄用排気流路への洗浄液流出における流下板幅方向での流出洗浄液の均一化という所期の目的は一応達成し得たものの、未だ次の如き点で改善の余地があった。
【０００４】
すなわち、吹き付け塗装作業域からの落下塗料や、塗料スラッジ（塗料ミストが洗浄液に着液して集合スラッジ化したものや、洗浄用排気流路での塗料ミスト捕捉に使用した洗浄液を塗料分離処理した上で再使用するにあたり、分離し切れずに再使用洗浄液に残った塗料スラッジなど）が、流下洗浄液の洗い流し機能にかかわらず、一旦、洗浄液流下板における傾斜板部分の板上に粘性により付着してしまうと、板上において、その塗料付着部の下流側部分に、洗浄液の液膜が不存となる液膜の切れ部が発生し、そして、この液膜の切れ部に塗料ミストや落下塗料が付着・堆積して、これが成長するといったことが生じ、この点、洗浄液流下板に対する清掃メンテナンスの負担を更に軽減する上で未だ改善の余地があった。
【０００５】
また、通常の運転状況では、上流側での流下板幅方向における多少の洗浄液供給ムラや流下板の多少の製作誤差にかかわらず、前記の溝部により洗浄用排気流路への洗浄液流出を流下板幅方向で均一にし得るものの、上記の液膜切れ部が発生すると、また更には、この液膜切れ部への塗料の付着堆積が進行して、これが成長すると、これに原因して、溝部への洗浄液流入における流下板幅方向での流入ムラが極端に大きくなり、この為、溝部での液面均平化では十分に対応できなくなって、洗浄用排気流路への洗浄液流出に流下板幅方向でのムラが生じるようになるといったこともあり、この点、洗浄用排気流路への洗浄液流出を流下板幅方向で均一なものに確実かつ安定的に保って、洗浄用排気流路での塗料ミスト捕捉性能を高く安定的に維持する上でも未だ改善の余地があった。
【０００６】
以上の実情に対し、本発明の主たる課題は、下流端部に溝部を形成する洗浄液流下板の細部構造を特定することにより、洗浄液流下板に対する清掃メンテナンスの一層の負担軽減を図り、また、洗浄用排気流路への洗浄液流出を流下板幅方向で均一な状態に確実かつ安定的に保って、塗料ミスト捕捉性能の一層の向上を図る点にある。
【０００７】
【課題を解決するための手段】
請求項１記載の発明では、溝部の液深さＤを１０ｍｍ〜３０ｍｍの範囲内にすることにより、溝部に溜まる塗料分の除去作業を軽減することと、気流の影響による溝部溜まり洗浄液の乱れを抑止して、洗浄用排気流路への洗浄液流出の均一化を効果的に達成することとの両立を図る。
【０００８】
すなわち、溝部の液深さＤを深くするほど、洗浄用排気流路への気流の影響による溝部溜まり洗浄液の乱れが小さくなって、溝部から洗浄用排気流路への洗浄液流出が安定化するが、溝部の液深さＤを３０ｍｍよりも深くすると、流下洗浄液により洗い流されて溝部に流入する塗料分のうち、その流入に引き続いて洗浄液とともに洗浄用排気流路へ円滑に排出されるものの割合が小さくなり、溝部への塗料分蓄積が目立つようになる。
【０００９】
一方、溝部の液深さＤを１０ｍｍよりも浅くすると、洗浄液とともに洗浄用排気流路へ排出される塗料分の割合は極端に大きくなるが、気流の影響による溝部溜まり洗浄液の乱れが大きくなって、この洗浄液乱れによる流下板幅方向での流出ムラが洗浄用排気流路への洗浄液流出において目立つようになり、これらのことから、溝部の液深さＤは１０ｍｍ〜３０ｍｍの範囲内が適当となる。
【００１０】
つまり、請求項１記載の発明によれば、清掃メンテナンスの負担軽減において、溝部に溜まる塗料分の除去作業の負担も軽減しながら、気流の影響による溝部溜まり洗浄液の乱れを抑止して、洗浄用排気流路への洗浄液流出における流下板幅方向での流出洗浄液の均一化を一層効果的に達成できる。
【００１１】
また、請求項１記載の発明では、上記繋がり部から洗浄用排気流路へ洗浄液を円滑に流出させる。
【００１２】
請求項２記載の発明では、前記溝部の洗浄液流下方向における溝幅寸法Ｌ２を２００ｍｍ〜５００ｍｍの範囲内にすることにより、溝部に溜まる塗料分の除去作業を容易にすることと、溝部での液面均平化をもって洗浄用排気流路への洗浄液流出を流下板幅方向で均一化することとの両立を図る。
【００１３】
すなわち、上記溝幅寸法Ｌ２を大きくするほど、溝部における液面均平化の効果は高くなるが、上記溝幅寸法Ｌ２を５００ｍｍよりも大きくすると、溝部の面積が大きくなって、溝部に溜まる塗料分の除去作業が負担の大きな作業となり、また、５００ｍｍを越えて上記溝幅寸法Ｌ２を大きくしても、洗浄用排気流路への洗浄液流出を均一化する効果の向上率はもはや小さなものとなる。
【００１４】
一方、上記溝幅寸法Ｌ２を２００ｍｍよりも小さくすると、溝部における液面均平化の効果が不十分となって、傾斜板部分から溝部への洗浄液流入の際の流下板幅方向での流入ムラが、溝部から洗浄用排気流路への洗浄液流出の際の流下板幅方向での流出ムラとなって残る傾向が目立つようになり、これらのことから、上記の溝幅寸法Ｌ２は２００ｍｍ〜５００ｍｍの範囲内が適当となる。
【００１５】
つまり、請求項２記載の発明によれば、清掃メンテナンスの負担軽減において、溝部に溜まる塗料分の除去作業も容易にしながら、溝部での液面均平化により洗浄用排気流路への洗浄液流出を流下板幅方向で均一にすることを効果的に達成できる。
【００１６】
なお、洗浄液流下板のうち、上流側の洗浄液受給部から下流側の洗浄液溜め用の溝部に至る傾斜板部分について、この傾斜板部分の水平方向に対する傾斜角度θを０．１°〜１．０°の範囲内にすることにより、傾斜板部分の板上を膜状形態で流下させる洗浄液の洗い流し機能は維持して、通常の落下塗料や塗料スラッジは十分に洗い流せるようにしながらも、この洗い流し機能にかかわらず、傾斜板部分の板上に落下塗料や塗料スラッジが一旦付着したときには、この付着部の下流側に流下洗浄液が回り込む状態にして、この付着部の下流側に液膜切れ部が生じないようにしてもよい。
【００１７】
すなわち、上記の傾斜角度θを１．０°よりも大きくした場合、落下塗料や塗料スラッジに対する流下洗浄液の洗い流し機能は大きなものとなるが、傾斜が大きい為に、傾斜板部分の板上に落下塗料や塗料スラッジが一旦付着したときには、膜状形態で流下する洗浄液が、この塗料付着部の下流側へ回り込めず、前述の如き液膜の切れ部が発生する。これに対し、上記の傾斜角度θを１．０°以下にすれば、膜状形態で流下させる洗浄液を塗料付着部の下流側へ回り込ませることが可能となり、この回り込み洗浄液により付着部の下流側にも液膜を再形成できるようになる。
【００１８】
一方、上記の傾斜角度θを０．１°よりも小さくした場合、傾斜板部分の板上で洗浄液が滞留傾向となって、通常程度の塗料スラッジや落下塗料さえも洗い流すことが難しくなり、また、滞留傾向となることで板上における膜状洗浄液の表面に渦流が形成されて、浮遊性の塗料スラッジまでが滞留蓄積するようになる。これに対し、上記の傾斜角度θを０．１°以上にすれば、膜状形態で洗浄液を流下させる運転状況の下で、通常の塗料スラッジや落下塗料に対しては、ほぼ十分な洗い流し機能を得ることができ、また、表面渦流の形成による浮遊性塗料スラッジの滞留蓄積も無くすことができる。
【００１９】
つまり、流下洗浄液の洗い流し機能にかかわらず、仮に洗浄液流下板の傾斜板部分に塗料スラッジや落下塗料が付着したとしても、その付着部の下流側に液膜切れ部が生じることを防止できて、この液膜切れ部への塗料ミストや落下塗料の付着堆積を防止できることにより、流下洗浄液の本来の洗い流し機能による清掃メンテナンスの負担軽減と相まって、洗浄液流下板に対する清掃メンテナンスの負担軽減を一層効果的に達成できる。
【００２０】
また、液膜切れ部の発生や、この液膜切れ部への塗料の付着堆積の為に、下流側の溝部への洗浄液流入に大きな流入ムラが生じるといったことも防止できることにより、溝部での液面均平化の下で、洗浄用排気流路への洗浄液流出を流下板幅方向で均一なものに一層確実かつ安定的に維持できるようになり、これにより、塗料ミスト捕捉性能の一層の向上が可能となる。
【００２１】
そして望ましくは、上記の傾斜角度θを、０．１°〜１．０°の範囲のうち、さらに、０．３°〜０．５°の範囲内に特定することにより、流下洗浄液の洗い流し機能を維持することと、塗料付着部の下流側への洗浄液の回り込みにより液膜切れ部の発生を防止することとの両立を確実かつ安定的なものにする。
つまり、洗浄液供給量の多少の変動や、供給洗浄液の多少の濃度変化といった運転上の多少の外乱要因にかかわらず、流下洗浄液の洗い流し機能と、液膜切れ部の発生防止機能との両方を、確実かつ安定的に得ることができ、これにより、上述の効果を一層確実かつ安定的に得ることができる。
【００２２】
また、前記の傾斜板部分における流下洗浄液の平均液膜厚さｄを５ｍｍ〜２０ｍｍの範囲内にすることにより、流下洗浄液を、流下板幅方向について均一化した状態で、傾斜板部分から下流端部の溝部に流入させるようにしてもよい。
【００２３】
すなわち、前記の如く特定した傾斜角度θ条件の下で、上記の平均液膜厚さｄを２０ｍｍよりも大きくする場合、傾斜板部分での洗浄液の流下速度が大きなものとなって、流下洗浄液の直進性が強くなり、この為、上流側の洗浄液受給部での流下板幅方向における洗浄液の供給ムラが、下流端部の溝部への洗浄液流入の際の流入ムラとなって残り易くなる。また、傾斜板部分に塗料付着が生じた場合、この付着部の下流側への洗浄液の回り込みは起こるものの、同様に、溝部への洗浄液流入において、この付着塗料に起因する流入ムラが残り易くなる。
【００２４】
これに対し、上記の平均液膜厚さｄを２０ｍｍ以下にすれば、流下洗浄液の直進性を抑制して、上流側での洗浄液供給ムラや、付着塗料に起因して生じるムラを傾斜板部分での流下過程で解消できるようになり、これら上流側でのムラが溝部への洗浄液流入の際の流入ムラとなって残ることを効果的に防止できる。
【００２５】
一方、前記の如く特定した傾斜角度θ条件の下で、上記の平均液膜厚さｄを５ｍｍよりも小さくする場合、傾斜板部分での洗浄液の直進性が弱くなって、板上における膜状洗浄液の全体が、渦流的偏流傾向をもった状態で、傾斜板部分を流下するようになり、この為に、下流端部の溝部への洗浄液流入に流入ムラを生じ易くなる。
【００２６】
これに対し、上記の平均液膜厚さｄを５ｍｍ以上にすれば、板上における膜状洗浄液の全体に直進性を与えて、上記の如き渦流的偏流傾向の発生を防止できようになり、この渦流的偏流傾向の発生に起因する溝部への洗浄液流入のムラを効果的に防止できる。
【００２７】
つまり、流下洗浄液を、流下板幅方向について効果的に均一化した状態で、傾斜板部分から溝部に流入させ得ることにより、この流入に続く溝部での液面均平化と相まって、洗浄用排気流路への洗浄液流出を流下板幅方向で均一なものにすることを一層効果的に達成できる。
【００２８】
また、このことにより、洗浄用排気流路への洗浄液流出の均一化の為に要求される溝部の溝幅寸法（洗浄液流下方向での溝幅寸法）も小さくすることができて、流下洗浄液による洗い流し塗料分の溜まり箇所として唯一残る溝部の全体面積を小さくすることができ、これにより、清掃メンテナンスの負担軽減において、溝部に溜まる塗料分の除去作業もさらに容易にすることができる。
【００２９】
また、前記傾斜板部分の長さＬ１を５００ｍｍ以上にすることにより、上流側の洗浄液受給部での洗浄液供給の際の動的乱れが、下流端部の溝部への洗浄液流入の際の流下板幅方向での流入ムラとなって残ることを防止するようにしてもよい。
【００３０】
すなわち、前記の如く特定した傾斜角度θ条件の場合、洗浄液受給部での洗浄液供給の際に生じる洗浄液の動的乱れが鎮静化されて、自重流下による安定的な膜状の洗浄液流が形成されるには、上流側の洗浄液受給部から５００ｍｍ程度の距離を要し、この為、上流側の洗浄液受給部から下流端部の溝部に至る傾斜板部分の長さＬ１を５００ｍｍ未満とするのでは、溝部への洗浄液流入において上記の動的乱れによる流下板幅方向での流入ムラが残り易くなる。これに対し、傾斜板部分の長さＬ１を５００ｍｍ以上にすれば、洗浄液供給の際の動的乱れを傾斜板部分での流下過程で鎮静することができて、この動的乱れの残留による溝部への洗浄液流入のムラを防止できる。
【００３１】
つまり、上流側での洗浄液供給の際の動的乱れを鎮静した状態で、流下洗浄液を傾斜板部分から溝部に流入させ得ることにより、この流入に続く溝部での液面均平化と相まって、洗浄用排気流路への洗浄液流出を流下板幅方向で均一なものにすることを一層効果的に達成できる。
【００３２】
また、このことにより、溝部の必要溝幅寸法も小さくすることができて、洗い流し塗料分の溜まり箇所としての溝部の全体面積を小さくすることができ、これにより、清掃メンテナンスの負担軽減において、溝部に溜まる塗料分の除去作業もさらに容易にすることができる。
【００３３】
【発明の実施の形態】
図１は塗装ブースを示し、ブース内の作業域１において被塗物２（本例では自動車ボディー）を自動塗装装置３により吹き付け塗装する。４は被塗物２を台車４ａに載置した状態で搬送するコンベア装置である。
【００３４】
作業域１においては、給気ファン５から供給される換気用空気を天井吹出口６から作業域１へ吹き出し供給し、また、これに並行して、作業域１の域内空気を排気ファン７により格子床８を介して下方へ排気し、これにより、吹き付け塗装に伴い作業域１で発生する余剰の塗料ミストを域内空気とともに作業域１から下方へ排出する。
【００３５】
格子床８の下方では、ブースの両側部から中央部に向かって洗浄液Ｗ（一般に塗料分散剤を添加した水）を膜状形態で流下させる一対の洗浄液流下板９を設け、また、これら洗浄液流下板９の下流端縁どうしの間には、作業域１からの排出空気Ａと両洗浄液流下板９からの流下洗浄液Ｗとを合流状態で高速通過させる洗浄用排気流路１０を形成してあり、これにより、洗浄液流下板９の板上において落下塗料や塗料スラッジを流下洗浄液Ｗにより洗い流すとともに、作業域１からの排出空気Ａに含まれる塗料ミストを洗浄用排気流路１０の通過過程で洗浄液Ｗにより捕捉除去して排出空気Ａを浄化する。
【００３６】
１１は、洗浄用排気流路１０を通過した排出空気Ａに対して水切り処理を行うエリミネータ、１２は、洗浄用排気流路１０で塗料ミストを捕捉した洗浄液Ｗを受け止める洗浄液槽であり、この洗浄液槽で受け止めた洗浄液Ｗは、槽外へ導いて適宜塗料分離処理を施した後、洗浄液流下板９へ再供給して循環使用する。
【００３７】
１３は、各洗浄液流下板９の上流側端部において流下板幅方向（すなわち、図１における紙面奥行き方向、換言すれば、被塗物搬送方向）に延びる洗浄液供給樋であり、これら洗浄液供給樋１３により、洗浄液供給路１４から供給される洗浄液Ｗを流下板幅方向に均等分散させて各洗浄液流下板９の板上に供給することで、流下板幅方向について極力均一な膜状洗浄液流を各洗浄液流下板９の板上に形成する。
【００３８】
なお、図２に示す如く、洗浄液供給樋１３は、流下板幅方向で一定長Ｍのものを流下板幅方向に一列状に複数並べて配置し、このように並べた洗浄液供給樋１３の夫々に対して洗浄液供給路１４を接続してある。また、前記の洗浄用排気流路１０は、その流入口１０ａが流下板幅方向に延びるスリット状となって、このスリット状の流入口１０ａが流下板幅方向で一列状に複数並ぶ状態に形成してあり、流下板幅方向におけるスリット状流入口１０ａどうしの間の部分は、両洗浄液流下板９どうしの繋がり部９ｗとしてある。
【００３９】
洗浄液供給樋１３からの洗浄液供給については、図２及び図３に示す如く、樋内部の洗浄液Ｗを樋底部から洗浄液流下板９の板上に流出させる底部流出管１５を、一定間隔で流下板幅方向（すなわち樋長手方向）に並べて各洗浄液供給樋１３の底部に設け、また、各洗浄液供給樋１３の両端部には、樋内部の洗浄液Ｗに対する樋内オーバーフロー堰１６ａを介して洗浄液Ｗをシュート１６ｂから洗浄液流下板９の板上に流出させる端部流出部１６を設け、これら複数の底部流出管１５及び両端の端部流出部１６からの洗浄液流出により、洗浄液Ｗを流下板幅方向に均等分散化した状態で洗浄液流下板９の板上に供給するようにしてある。
【００４０】
なお、このように底部流出管１５をもって樋内部の洗浄液Ｗを樋底部から流出させることにより、樋内部での塗料スラッジの沈降堆積を合わせ防止する。また、洗浄液供給樋１３の両端部については、樋内オーバーフロー堰１６ａを介しての洗浄液流出とすることにより、樋内部において樋端部の樋内オーバーフロー堰１６ａに向かう洗浄液表面流を形成し、これにより、樋内部での浮遊性塗料スラッジの蓄積も合わせ防止する。
【００４１】
底部流出管１５からの洗浄液流出、及び、端部流出部１６でのシュート１６ｂからの洗浄液流出は、夫々、対応する洗浄液流下板９の流下方向とは逆向きに洗浄液Ｗを流出させて、この流出洗浄液Ｗを一旦、ブース側壁１７に衝突させた上で洗浄液流下板９の板上に供給する形態としてあり、このブース側壁１７への衝突に伴う流下板幅方向への洗浄液分散をもって、洗浄液流下板９への洗浄液供給が流下板幅方向について一層効果的に均一化されるようにしてある。
【００４２】
一方、各洗浄液流下板９は、図３に示す如く、その断面形状において、下流端部に上流側の傾斜板部分９Ａの下流端縁から流下洗浄液Ｗを堰等を介さず直接に流入させる洗浄液溜め用の溝部１８を有する構造としてあり、上流側からの流下洗浄液Ｗを一旦、溝部１８に受け入れて、この受け入れ洗浄液Ｗを、溝部１８における洗浄用排気流路１０の側の溝壁１８ｗからのオーバーフローにより、膜状形態で溝部１８から洗浄用排気流路１０へ流出させるようにしてある。
【００４３】
つまり、上流側での洗浄液供給ムラや流下板９の製作誤差などに起因して、上記溝部１８への洗浄液流入に流下板幅方向での多少のムラがあったとしても、上記溝部１８での洗浄液貯留による液面均平化により、洗浄液Ｗを流下板幅方向に均一化した状態で、溝部１８から洗浄用排気流路１０に流出させ得るようにして、洗浄用排気流路１０での塗料ミスト捕捉性能を高く確保する。
【００４４】
なお、上記の溝部１８は図２に示す如く、洗浄用排気流路１０における各スリット状流入口１０ａの両側部にのみ設け、スリット状流入口１０ａどうしの間における両洗浄液流下板９どうしの繋がり部９ｗは、溝などの段部を設けることの無い両洗浄液流下板９どうしの平滑な繋がり構造（具体的には、同図２に示す如く両洗浄液流下板（９）における前記傾斜板部分（９Ａ）の下流端縁どうしを段部の無い平滑な状態で繋ぐ構造）としてある。すなわち、この繋がり部９ｗからの洗浄用排気流路１０への洗浄液流出については、洗浄用排気流路１０への洗浄液流出を流下板幅方向について均一化することとは直接の関係が無く、むしろ、この繋がり部９ｗから洗浄用排気流路１０への洗浄液流出を円滑にして、繋がり部９ｗでの塗料分堆積を防止することの方が重要であることから、溝などの段部を設けることの無い平滑な繋がり構造を採用してある。
【００４５】
各洗浄液流下板９のうち、洗浄液供給樋１３からの洗浄液供給を受ける上流側の洗浄液受給部から上記の溝部１８に至る傾斜板部分９Ａについては、この傾斜板部分９Ａの水平方向に対する傾斜角度θを０．１°〜１．０°の範囲内、さらに望ましくは０．３°〜０．５°の範囲内に設定してあり（本例ではθ＝０．４°を採用）、これにより、傾斜板部分９Ａの板上を膜状形態で流下させる洗浄液Ｗの洗い流し機能は維持して、通常程度の落下塗料や塗料スラッジは十分に洗い流せるようにしながらも、この洗い流し機能にかかわらず、傾斜板部分９Ａの板上に落下塗料や塗料スラッジが粘性により一旦付着したときには、この付着部の下流側に流下洗浄液Ｗが回り込んで、この付着部の下流側に液膜切れ部が発生することが防止されるようにしてある。
【００４６】
また、上記の傾斜板部分９Ａにおける流下洗浄液Ｗの平均液膜厚さｄは、５ｍｍ〜２０ｍｍの範囲内、さらに望ましくは８ｍｍ〜１５ｍｍの範囲内に設定してあり（本例ではｄ＝１０ｍｍ（θ＝０．４°の条件では洗浄液Ｗの流下速度ｖ＝０．３３ｍ／ｓに相当）を採用）、これにより、上記の傾斜角度θ条件の下で、流下洗浄液Ｗの直進性が過大となって、上流側での流下板幅方向における洗浄液Ｗのムラが溝部１８への洗浄液流入の際の流入ムラとなって残り易くなるといったことや、逆に、直進性が過少となって板上における膜状洗浄液Ｗの全体に渦流的偏流傾向が生じ、この為に溝部１８への洗浄液流入に流下板幅方向での流入ムラが生じるといったことを防止する。
【００４７】
さらにまた、上記傾斜板部分９Ａの長さＬ１は５００ｍｍ以上、さらに望ましくは１０００ｍｍ以上にしてあり（本例ではＬ１＝１８５０ｍｍを採用）、これにより、前記の傾斜角度θ条件の下で、上流側の洗浄液受給部での洗浄液供給の際の動的乱れが、溝部１８への洗浄液流入の際の流下板幅方向での流入ムラとなって残ることを防止する。
【００４８】
すなわち、平均液膜厚さｄ及び傾斜板部分９Ａの長さＬ１を上記の如く設定して、溝部１８への洗浄液流入の際の流下板幅方向での流入ムラを抑止することにより、溝部１８における液面均平化と相まって、洗浄用排気流路１０への洗浄液流出を流下板幅方向について一層効果的に均一化する。
【００４９】
また、溝部１８の洗浄液流下方向における長さＬ２は、２００ｍｍ〜５００ｍｍの範囲内にしてあり（本例ではＬ２＝３００ｍｍを採用）、これにより、溝部１８における液面均平化の効果が不十分となって、傾斜板部分９Ａから溝部１８への洗浄液流入の際の流下板幅方向での流入ムラが、溝部１８から洗浄用排気流路１０への洗浄液流出の際の流下板幅方向での流出ムラとなって残るといったことを防止しながら、洗い流し塗料分の溜まり箇所として残る溝部１８の面積を極力小さくする。
【００５０】
さらにまた、溝部１８の液深さＤは、１０ｍｍ〜２０ｍｍの範囲内にしてあり（本例ではＤ＝２０ｍｍを採用）、これにより、気流の影響による溝部溜まり洗浄液Ｗの乱れを小さくして、溝部１８から洗浄用排気流路１０への洗浄液流出を安定化することと、溝部１８に流入する洗い流し塗料分の多くが洗浄液Ｗとともに洗浄用排気流路１０へ円滑に排出されるようにして、溝部１８への塗料分蓄積を抑止することとの両立を図る。
【００５１】
すなわち、溝部１８の洗浄液流下方向における長さＬ２、及び、溝部１８の液深さＤを上記の如く設定することにより、溝部１８に溜まる塗料分の除去作業を容易で負担の軽いものとしながら、洗浄用排気流路１０への洗浄液流出における流下板幅方向での流出洗浄液Ｗの均一化をさらに効果的に達成する。
【００５２】
〔別の実施形態〕
次に発明の別の実施形態を列記する。
洗浄液Ｗには、水、あるいは、適当な薬剤を添加した水、さらにまた、水以外の液など、種々のものを適用できる。
【００５３】
洗浄用排気流路１０の具体的流路構造は、前述の図１〜図３に示す構造に限定されるものではなく、その他、種々の流路構造を採用できる。
【００５４】
洗浄液流下板９の上流側に対する洗浄液供給構造は、前述の実施形態の如く、樋底部から洗浄液Ｗを流出させる形式の洗浄液供給樋１３を設けるに代え、樋の全長にわたって、その一側壁部から洗浄液Ｗをオーバーフローさせる形態で、洗浄液Ｗを洗浄液流下板９の板上に供給する全長オーバーフロー式の洗浄液供給樋を設けるなど、その他、種々の形式の洗浄液供給構造を採用できる。
【００５５】
被塗物は自動車ボディーに限定されるものでなく、電化製品のケーシングなど、その他、どのようなものであってもよい。
【００５６】
尚、特許請求の範囲の項に図面との対照を便利にするため符号を記すが、該記入により本発明は添付図面の構成に限定されるものではない。
【図面の簡単な説明】
【図１】塗装ブースの全体断面図
【図２】拡大平面図
【図３】洗浄液流下板部分の拡大断面図
【符号の説明】
Ｗ洗浄液
９洗浄液流下板
１吹き付け塗装作業域
Ａ排出空気
１０洗浄用排気流路
１０ａ流入口
１８洗浄液溜め用の溝部
１８ｗ溝壁
９Ａ傾斜板部分
９ｗ繋がり部
θ 傾斜角度
ｄ平均液膜厚さ
Ｌ１傾斜板部分の長さ
Ｌ２溝幅寸法
Ｄ溝部液深さ[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a coating booth, and more specifically, a cleaning liquid flow-down plate having an inclined posture for flowing down a cleaning liquid in a film form is provided below a spray coating work area. Forming a cleaning exhaust flow path that allows air discharged together with the paint mist and the cleaning liquid flowing down from the cleaning liquid flow-down plate to pass in a merged state, wherein the cleaning liquid flow-down plate has an upstream side at a downstream end in a cross-sectional shape thereof. A cleaning liquid reservoir groove for directly flowing the cleaning liquid flowing down from the downstream edge of the inclined plate portion, and overflowing the groove wall on the side of the cleaning exhaust flow path in this groove section to allow the cleaning exhaust flow to flow from the groove section. The present invention relates to a coating booth having a structure in which a cleaning liquid flows out of a road.
[0002]
[Prior art]
The above-mentioned type of coating booth cleans the cleaning liquid flowing down plate by preventing the accumulation of paint sludge and falling paint over the entire surface of the cleaning liquid flowing down plate by the function of washing down the cleaning liquid flowing down on the plate of the cleaning liquid flowing down plate. The maintenance burden is reduced, and due to the cleaning liquid supply unevenness in the downstream plate width direction on the upstream side and the manufacturing error of the downstream plate, there is a slight unevenness in the flow direction of the cleaning liquid flowing into the groove. Even if there is, the cleaning liquid is allowed to flow out of the groove into the cleaning exhaust flow path in a state where the cleaning liquid is made uniform in the width direction of the falling plate by the leveling of the cleaning liquid by storing the cleaning liquid in the groove. High paint mist trapping performance in the road (ie, the function of trapping and removing paint mist contained in the air discharged from the spray painting work area by the cleaning liquid during the passage through the cleaning exhaust passage) can be ensured. As in is obtained by painting booth of this type, previously proposed by Japanese Patent Application No. Hei 7-217026.
[0003]
[Problems to be solved by the invention]
However, with the above proposed structure, the intended purposes of reducing the burden of cleaning maintenance on the cleaning liquid flow-down plate and making the cleaning liquid flowing out in the width direction of the flow-down plate at the time of the cleaning liquid flowing out to the cleaning exhaust flow path attain tentatively achieved. Although obtained, there is still room for improvement in the following points.
[0004]
That is, paint falling from the spray coating work area, paint sludge (a paint mist was deposited on the cleaning fluid to form a collective sludge, and a cleaning fluid used for trapping the paint mist in the cleaning exhaust passage were subjected to paint separation processing. When reused above, paint sludge that remains in the reused cleaning liquid without being separated completely once adheres viscously to the inclined plate portion of the cleaning liquid flowing down plate regardless of the flushing function of the flowing down cleaning liquid. If this occurs, on the plate, a cut in the liquid film where the liquid film of the cleaning liquid does not exist occurs on the downstream side of the coating portion of the paint, and paint mist or falling paint is formed on the cut portion of the liquid film. Is deposited and deposited, and grows. In this regard, there is still room for improvement in further reducing the burden of cleaning maintenance on the cleaning liquid flow-down plate.
[0005]
Further, in a normal operation condition, the flow of the cleaning liquid to the cleaning exhaust flow path is caused by the grooves, regardless of a slight unevenness in the supply of the cleaning liquid in the width direction of the falling plate on the upstream side or a slight manufacturing error of the falling plate. Although it can be made uniform in the width direction, when the above-mentioned liquid film break occurs, and furthermore, the adhesion and deposition of paint on the liquid film break progresses, and when this grows, the paint grows into the groove. The unevenness of the inflow of the cleaning liquid in the width direction of the washing plate in the width direction of the washing liquid becomes extremely large, and therefore, it is not possible to sufficiently cope with the leveling of the liquid surface in the groove portion. In this regard, unevenness in the direction may occur, and in this regard, the outflow of the cleaning liquid to the exhaust passage for cleaning is reliably and stably maintained in a uniform direction in the width direction of the falling plate. High and stable paint mist trapping performance Also in terms of equity there was still room for improvement.
[0006]
In view of the above circumstances, the main problem of the present invention is to specify the detailed structure of the cleaning liquid flow-down plate forming a groove at the downstream end, thereby further reducing the cleaning maintenance load on the cleaning liquid flow-down plate, and An object of the present invention is to ensure that the outflow of the cleaning liquid to the exhaust gas flow path is reliably and stably maintained in a uniform state in the width direction of the falling plate, thereby further improving the paint mist capturing performance.
[0007]
[Means for Solving the Problems]
According to the first aspect of the invention, by setting the liquid depth D of the groove within the range of 10 mm to 30 mm, the work of removing the paint remaining in the groove is reduced, and the turbulence of the cleaning liquid accumulated in the groove due to the influence of the air flow is reduced. In addition, it is possible to effectively achieve uniform discharge of the cleaning liquid to the cleaning exhaust passage.
[0008]
That is, as the liquid depth D of the groove portion is increased, the turbulence of the cleaning liquid accumulated in the groove portion due to the influence of the airflow on the cleaning exhaust flow path is reduced, and the outflow of the cleaning liquid from the groove portion to the cleaning exhaust flow path is stabilized. When the liquid depth D of the groove is more than 30 mm, the proportion of the paint that is washed away by the flowing down cleaning liquid and flows into the groove and that is smoothly discharged to the cleaning exhaust flow path together with the cleaning liquid following the inflow is reduced. As a result, the amount of paint in the grooves becomes conspicuous.
[0009]
On the other hand, if the liquid depth D of the groove portion is smaller than 10 mm, the proportion of the paint discharged to the cleaning exhaust passage together with the cleaning liquid becomes extremely large, but the turbulence of the groove pooling cleaning liquid due to the influence of the air flow becomes large. The outflow unevenness in the width direction of the falling plate due to the turbulence of the washing liquid becomes conspicuous in the outflow of the washing liquid to the exhaust passage for washing. From these facts, it is considered that the liquid depth D of the groove is appropriate in the range of 10 mm to 30 mm. Become.
[0010]
In other words, according to the first aspect of the present invention, in reducing the burden of cleaning maintenance, the burden of removing the paint remaining in the groove is reduced, and the disturbance of the cleaning liquid accumulated in the groove due to the influence of the air flow is suppressed. It is possible to more effectively achieve the uniformity of the cleaning liquid flowing out in the width direction of the falling plate when the cleaning liquid flows out to the exhaust passage.
[0011]
Claims1StatedAccording to the present invention, the cleaning liquid flows out smoothly from the connection portion to the exhaust passage for cleaning.
[0012]
Claim2In the invention described above, the groove width dimension L2 in the cleaning liquid flowing direction of the groove portion is set in the range of 200 mm to 500 mm, thereby facilitating the work of removing the paint remaining in the groove portion, and leveling the liquid level in the groove portion. This makes it possible to make the outflow of the cleaning liquid to the exhaust passage for cleaning uniform in the width direction of the falling plate.
[0013]
That is, as the groove width dimension L2 is increased, the effect of leveling the liquid surface in the groove section is increased. However, when the groove width dimension L2 is larger than 500 mm, the area of the groove section is increased, and the paint that accumulates in the groove section is increased. Even if the groove width dimension L2 exceeds 500 mm, the improvement rate of the effect of uniformizing the outflow of the cleaning liquid to the cleaning exhaust passage is small. Become.
[0014]
On the other hand, if the groove width dimension L2 is smaller than 200 mm, the effect of leveling the liquid level in the groove portion becomes insufficient, and the inflow unevenness in the flowing plate width direction when the cleaning liquid flows from the inclined plate portion into the groove portion. However, when the cleaning liquid flows out from the groove portion to the cleaning exhaust flow path, it tends to remain as outflow unevenness in the flow-down plate width direction, so that the groove width dimension L2 is 200 mm to 500 mm. Is appropriate.
[0015]
In other words, the claims2According to the described invention, in reducing the burden of cleaning maintenance, the work of removing the paint remaining in the groove is also facilitated, and the level of the liquid in the groove is leveled so that the cleaning liquid flows out to the cleaning exhaust flow path in the width direction of the falling plate. And uniformity can be effectively achieved.
[0016]
In addition,Of the cleaning liquid flowing-down plate, the inclination angle θ of the inclined plate portion with respect to the horizontal direction from the cleaning liquid receiving section on the upstream side to the groove for the cleaning liquid reservoir on the downstream side is set to 0.1 ° to 1.0 °. By setting it within the range, the function of flushing the cleaning liquid that flows down on the plate of the inclined plate portion in a film form is maintained, and normal falling paint and paint sludge can be sufficiently washed away, but it is not affected by this flushing function Instead, once the falling paint or paint sludge adheres to the plate of the inclined plate portion, the falling cleaning liquid is spilled to the downstream side of the attached portion so that the liquid film breakage does not occur on the downstream side of the attached portion. ToMay be.
[0017]
That is, when the above-mentioned inclination angle θ is set to be larger than 1.0 °, the function of flushing the falling washing liquid with respect to the falling paint or paint sludge becomes large. Once the paint or paint sludge has adhered, the cleaning liquid flowing down in the form of a film cannot flow to the downstream side of the paint-applied portion, and the cut portion of the liquid film occurs as described above. On the other hand, when the inclination angle θ is set to 1.0 ° or less, the cleaning liquid flowing down in the form of a film can be spilled to the downstream side of the paint application section, and the sneak cleaning liquid allows the cleaning liquid to flow downstream of the application section. Thus, the liquid film can be formed again.
[0018]
On the other hand, if the inclination angle θ is smaller than 0.1 °, the cleaning liquid tends to stay on the plate of the inclined plate portion, and it becomes difficult to wash away even ordinary paint sludge and falling paint, Due to the tendency to stay, a vortex is formed on the surface of the film-like cleaning liquid on the plate, so that even the floating paint sludge stays and accumulates. On the other hand, if the above-mentioned inclination angle θ is set to 0.1 ° or more, under the operating condition in which the cleaning liquid flows down in the form of a film, the cleaning function is almost sufficient for ordinary paint sludge and falling paint. Can be obtained, and stagnation and accumulation of floating paint sludge due to formation of a surface vortex can be eliminated.
[0019]
ToesFlowRegardless of the flushing function of the lower cleaning liquid, even if paint sludge or falling paint adheres to the inclined plate portion of the cleaning liquid flow-down plate, it is possible to prevent the occurrence of a liquid film breakage downstream of the adhering part, and this liquid The ability to prevent paint mist or falling paint from adhering to and accumulating on film breaks, combined with the reduced cleaning maintenance burden due to the original flushing function of the flowing down cleaning liquid, can more effectively reduce the cleaning maintenance load on the cleaning liquid flowing down plate. .
[0020]
In addition, it is possible to prevent a large inflow unevenness in the inflow of the cleaning liquid into the downstream groove portion due to the occurrence of the liquid film break portion and the adhesion and deposition of the paint on the liquid film break portion. Under leveling, it is possible to more reliably and stably maintain the outflow of the cleaning liquid to the cleaning exhaust channel in the width direction of the falling plate, thereby further improving the paint mist trapping performance. Becomes possible.
[0021]
And desirably, the above-mentioned inclination angle θTo 0. In the range of 1 ° to 1.0 °, by further specifying the range of 0.3 ° to 0.5 °, it is possible to maintain the flushing function of the flowing down cleaning liquid and to the downstream side of the paint adhesion portion. And the prevention of the occurrence of a liquid film break due to the circling of the cleaning liquid is ensured and stabilized.
In other words, irrespective of some fluctuation factors in the operation such as a slight variation in the supply amount of the cleaning liquid and a slight change in the concentration of the supplied cleaning liquid, both the function of flushing the falling cleaning liquid and the function of preventing the occurrence of the liquid film breakage are provided. Can be obtained reliably and stably,EffectThe result can be obtained more reliably and stably.
[0022]
Also,By making the average liquid film thickness d of the flowing-down cleaning liquid in the inclined plate portion in the range of 5 mm to 20 mm, the flowing-down cleaning liquid is made uniform in the width direction of the flowing-down plate, and from the inclined plate portion to the downstream end. So that it flows into the grooveMay be.
[0023]
That is,As mentioned aboveWhen the above average liquid film thickness d is larger than 20 mm under the specified inclination angle θ condition, the flow rate of the cleaning liquid at the inclined plate portion becomes large, and the straightness of the flowing cleaning liquid becomes strong. For this reason, the supply unevenness of the cleaning liquid in the width direction of the flowing-down plate at the cleaning liquid receiving portion on the upstream side tends to remain as the unevenness in the flow of the cleaning liquid into the groove at the downstream end. Further, when paint adheres to the inclined plate portion, although the cleaning liquid spills to the downstream side of the adhered portion, similarly, when the cleaning liquid flows into the groove, the inflow unevenness due to the adhered paint tends to remain. .
[0024]
On the other hand, if the average liquid film thickness d is set to 20 mm or less, the straightness of the flowing down cleaning liquid is suppressed, and unevenness in the supply of the cleaning liquid on the upstream side and unevenness caused by the adhered paint are reduced. It is possible to effectively prevent the unevenness on the upstream side from remaining as the inflow unevenness when the cleaning liquid flows into the groove.
[0025]
on the other hand,As mentioned aboveUnder the specified inclination angle θ condition, when the average liquid film thickness d is smaller than 5 mm, the straightness of the cleaning liquid in the inclined plate portion is weakened, and the entire film cleaning liquid on the plate is In the state having the vortex-like drift tendency, the inclined plate portion flows down, and therefore, the inflow of the cleaning liquid into the groove at the downstream end portion tends to cause unevenness.
[0026]
On the other hand, if the average liquid film thickness d is set to 5 mm or more, the entire film-like cleaning liquid on the plate is provided with straightness, and the occurrence of the eddy drift tendency as described above can be prevented. It is possible to effectively prevent unevenness in the flow of the cleaning liquid into the groove due to the generation of the swirling drift tendency.
[0027]
ToesFlowBy allowing the lower cleaning liquid to flow into the groove from the inclined plate portion in a state where the lower cleaning liquid is effectively made uniform in the width direction of the falling plate, the cleaning exhaust flow path is combined with the leveling of the liquid surface in the groove following the inflow. It is possible to more effectively achieve that the outflow of the cleaning liquid to the falling plate becomes uniform in the width direction of the falling plate.
[0028]
This also makes it possible to reduce the groove width dimension (groove width dimension in the cleaning liquid flowing down direction) of the groove required for uniformizing the flow of the cleaning liquid to the cleaning exhaust flow path. It is possible to reduce the entire area of the groove portion that remains only as a pooled portion for the wash-off paint, and thus, it is possible to further facilitate the work of removing the paint accumulated in the groove portion in reducing the burden of cleaning maintenance.
[0029]
Also,By setting the length L1 of the inclined plate portion to 500 mm or more, the dynamic turbulence at the time of supplying the cleaning liquid at the cleaning liquid receiving portion on the upstream side causes the flowing-down plate width direction when the cleaning liquid flows into the groove at the downstream end. To prevent inflow unevenness and remainingMay be.
[0030]
That is,As mentioned aboveIn the case of the specified inclination angle θ condition, the dynamic turbulence of the cleaning liquid generated at the time of supplying the cleaning liquid at the cleaning liquid receiving unit is calmed down, and a stable film-like cleaning liquid flow due to the own weight flow is formed. A distance of about 500 mm is required from the cleaning liquid receiving portion on the upstream side, and therefore, if the length L1 of the inclined plate portion from the cleaning liquid receiving portion on the upstream side to the groove portion on the downstream end is less than 500 mm, the cleaning liquid on the groove portion is required. In the inflow, unevenness in the inflow in the downflow plate width direction due to the dynamic turbulence described above tends to remain. On the other hand, if the length L1 of the inclined plate portion is set to 500 mm or more, the dynamic turbulence at the time of supplying the cleaning liquid can be calmed down in the process of flowing down the inclined plate portion, and the groove portion due to the residual of the dynamic turbulence can be reduced. Unevenness in the flow of the cleaning liquid into the cleaning liquid can be prevented.
[0031]
ToesUpIn a state where the dynamic turbulence at the time of supplying the cleaning liquid on the flow side is calmed down, the flowing down cleaning liquid can flow from the inclined plate portion into the groove portion, and in conjunction with the leveling of the liquid surface in the groove portion following this inflow, the cleaning solution is used. It can be more effectively achieved that the outflow of the cleaning liquid to the exhaust passage is made uniform in the width direction of the falling plate.
[0032]
This alsoGrooveThe required groove width dimension of the part can also be reduced, and the entire area of the groove as a reservoir for the wash-off paint can be reduced, thereby removing the paint remaining in the groove in reducing the burden of cleaning maintenance. The work can be further facilitated.
[0033]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 shows a painting booth in which a work 2 (in this example, an automobile body) is spray-painted by an automatic painting device 3 in a work area 1 in the booth. Reference numeral 4 denotes a conveyor device that conveys the article 2 while being placed on the carriage 4a.
[0034]
In the work area 1, ventilation air supplied from the air supply fan 5 is blown out from the ceiling outlet 6 to the work area 1, and in parallel with this, air in the work area 1 is exhausted by the exhaust fan 7. Air is exhausted downward through the grid floor 8, whereby excess paint mist generated in the work area 1 due to spray painting is discharged downward from the work area 1 together with air in the area.
[0035]
Below the grid floor 8, there is provided a pair of cleaning liquid flow-down plates 9 for flowing the cleaning liquid W (generally, water containing a paint dispersant) in a film form from both sides of the booth toward the center thereof. A cleaning exhaust passage 10 is formed between the downstream edges of the plates 9 to allow the exhaust air A from the work area 1 and the flowing down cleaning liquid W from both the cleaning liquid flowing down plates 9 to flow at a high speed in a combined state. Thus, the falling paint and paint sludge are washed away on the plate of the washing liquid falling plate 9 by the falling washing liquid W, and the paint mist contained in the air A discharged from the work area 1 is washed by the washing liquid The exhaust air A is purified by being trapped and removed by W.
[0036]
11 is an eliminator for draining the exhaust air A that has passed through the cleaning exhaust flow path 10, and 12 is a cleaning liquid tank that receives the cleaning liquid W that has captured the paint mist in the cleaning exhaust flow path 10. The cleaning liquid W received in the tank is guided to the outside of the tank and subjected to appropriate paint separation processing, and then re-supplied to the cleaning liquid flow-down plate 9 for circulating use.
[0037]
Reference numeral 13 denotes a cleaning liquid supply gutter extending at the upstream end of each cleaning liquid flow-down plate 9 in the width direction of the falling plate (that is, in the depth direction of the paper surface in FIG. 1, in other words, in the conveying direction of the workpiece). 13, the cleaning liquid W supplied from the cleaning liquid supply path 14 is evenly dispersed in the width direction of the falling plate and supplied onto the plate of each of the cleaning liquid falling plates 9 so that the film-like cleaning liquid flow as uniform as possible in the width direction of the falling plate. It is formed on the plate of each washing liquid falling plate 9.
[0038]
As shown in FIG. 2, a plurality of cleaning liquid supply gutters 13 having a fixed length M in the falling plate width direction are arranged in a line in the falling plate width direction, and each of the cleaning liquid supply gutters 13 arranged in this manner is arranged. On the other hand, a cleaning liquid supply path 14 is connected. Further, the cleaning exhaust passage 10 is formed such that its inlet 10a has a slit shape extending in the width direction of the falling plate, and the plurality of slit-shaped inlets 10a are arranged in a line in the width direction of the falling plate. The portion between the slit-shaped inflow ports 10a in the width direction of the falling plate is a connecting portion 9w between the two washing liquid falling plates 9.
[0039]
As shown in FIGS. 2 and 3, the cleaning liquid supply from the cleaning liquid supply gutter 13 is carried out at regular intervals by a bottom outlet pipe 15 for allowing the cleaning liquid W inside the gutter to flow from the bottom of the gutter onto the cleaning liquid falling plate 9. The cleaning liquid W is provided at the bottom of each cleaning liquid supply gutter 13 side by side in the width direction (that is, the longitudinal direction of the gutter), and the cleaning liquid W is supplied to both ends of each cleaning liquid supply gutter 13 via an overflow weir 16a for the cleaning liquid W inside the gutter. An end outflow portion 16 is provided for allowing the cleaning solution to flow out of the chute 16b onto the plate of the cleaning solution flowing down plate 9, and the cleaning solution W flows out of the plurality of bottom outflow pipes 15 and the end outflow portions 16 at both ends in the width direction of the flowing down plate. The cleaning liquid is supplied onto the plate 9 of the washing liquid flow-down plate 9 in an evenly dispersed state.
[0040]
In addition, by causing the cleaning liquid W inside the gutter to flow out from the bottom of the gutter by using the bottom outflow pipe 15, the sedimentation and accumulation of paint sludge inside the gutter can be prevented. In addition, at both ends of the cleaning liquid supply gutter 13, the cleaning liquid flows out through the gutter overflow weir 16 a to form a cleaning liquid surface flow toward the gutter overflow weir 16 a at the gutter end inside the gutter. It also prevents the accumulation of floating paint sludge inside the gutter.
[0041]
The outflow of the cleaning liquid from the bottom outflow pipe 15 and the outflow of the cleaning liquid from the chute 16b at the end outflow section 16 cause the cleaning liquid W to flow out in the opposite direction to the flowing direction of the corresponding downflow plate 9 for cleaning liquid. The outflow cleaning liquid W is once made to collide with the booth side wall 17 and then supplied onto the cleaning liquid flow-down plate 9. The supply of the cleaning liquid to the plate 9 is made more effectively uniform in the width direction of the falling plate.
[0042]
On the other hand, as shown in FIG. 3, each of the cleaning liquid flowing-down plates 9 has a cross-sectional shape, in which the cleaning liquid W directly flows into the downstream end from the downstream edge of the upstream inclined plate portion 9A without passing through a weir or the like. It has a structure having a groove 18 for storing, and the cleaning liquid W flowing down from the upstream side is temporarily received in the groove 18, and the received cleaning liquid W is transferred from the groove wall 18 w on the groove 18 to the side of the cleaning exhaust flow path 10. Due to the overflow, the gas flows out from the groove 18 to the cleaning exhaust passage 10 in a film form.
[0043]
That is, due to unevenness in the supply of the cleaning liquid on the upstream side or a manufacturing error of the falling plate 9, even if there is some unevenness in the width of the falling plate in the flow of the cleaning liquid into the groove 18, the unevenness in the groove 18 does not increase. The cleaning liquid W is allowed to flow out from the groove 18 to the cleaning exhaust flow path 10 in a state where the cleaning liquid W is made uniform in the width direction of the falling plate by leveling the liquid level by storing the cleaning liquid. Ensure high mist trapping performance.
[0044]
As shown in FIG. 2, the grooves 18 are provided only on both sides of each of the slit-shaped inlets 10a in the exhaust passage 10 for cleaning, and the connection between the cleaning liquid flow-down plates 9 between the slit-shaped inlets 10a. The portion 9w has a smooth connection structure between the two washing liquid flow-down plates 9 without a step such as a groove.(Specifically, as shown in FIG. 2, a structure in which the downstream edges of the inclined plate portions (9A) in both the washing liquid flow-down plates (9) are connected in a smooth state without a step).There is. In other words, the outflow of the cleaning liquid from the connecting portion 9w to the evacuation flow path 10 for cleaning has no direct relation to making the outflow of the cleaning liquid to the evacuation flow path 10 for cleaning uniform in the width direction of the falling plate. Since it is more important to smooth out the cleaning liquid from the connecting portion 9w to the cleaning exhaust flow path 10 and to prevent paint deposits at the connecting portion 9w, it is necessary to provide a step portion such as a groove. Adopts a smooth connection structure without any.
[0045]
Of each of the cleaning liquid flow-down plates 9, the inclined plate portion 9A extending from the cleaning liquid receiving portion on the upstream side receiving the cleaning liquid supply from the cleaning liquid supply gutter 13 to the above-mentioned groove portion 18 has an inclination angle θ of the inclined plate portion 9A with respect to the horizontal direction. Is set in the range of 0.1 ° to 1.0 °, more preferably in the range of 0.3 ° to 0.5 ° (in this example, θ = 0.4 ° is adopted). In addition, while maintaining the washing function of the washing liquid W for flowing down on the plate of the inclined plate portion 9A in the form of a film, the falling paint and paint sludge of a normal level can be sufficiently washed away, but regardless of this washing function, the inclined When the falling paint or paint sludge once adheres to the plate of the plate portion 9A due to viscosity, the falling washing liquid W flows downstream of the attached portion, and a liquid film breakage is generated downstream of the attached portion. Is prevented And Aru.
[0046]
Further, the average liquid film thickness d of the flowing down cleaning liquid W in the inclined plate portion 9A is set in a range of 5 mm to 20 mm, more preferably in a range of 8 mm to 15 mm (d = 10 mm in this example). Under the condition of θ = 0.4 °, the falling velocity v of the cleaning liquid W is equivalent to 0.33 m / s), whereby the linearity of the falling cleaning liquid W is excessive under the above-described inclination angle θ condition. As a result, the unevenness of the cleaning liquid W in the width direction of the falling plate on the upstream side is likely to remain as inflow unevenness when the cleaning liquid flows into the groove portion 18, and conversely, the straightness becomes too small to allow the cleaning liquid to flow on the plate. Thus, it is possible to prevent the flow of the cleaning liquid into the groove portion 18 from causing uneven flow in the width direction of the falling plate due to the vortex-like drift tendency in the whole of the film-like cleaning liquid W.
[0047]
Further, the length L1 of the inclined plate portion 9A is 500 mm or more, more preferably 1000 mm or more (in this example, L1 = 1850 mm is adopted), whereby the upstream side is obtained under the above-mentioned inclination angle θ condition. It is possible to prevent the dynamic turbulence at the time of supplying the cleaning liquid in the cleaning liquid receiving section from being caused to remain as inflow unevenness in the width direction of the falling plate when the cleaning liquid flows into the groove portion 18.
[0048]
That is, by setting the average liquid film thickness d and the length L1 of the inclined plate portion 9A as described above, the inflow unevenness in the flow-down plate width direction when the cleaning liquid flows into the groove portion 18 is suppressed. In conjunction with the leveling of the liquid level in the above, the outflow of the cleaning liquid to the cleaning exhaust passage 10 is more effectively uniformed in the width direction of the falling plate.
[0049]
The length L2 of the groove 18 in the cleaning liquid flowing direction is in the range of 200 mm to 500 mm (in this example, L2 = 300 mm is adopted), whereby the effect of leveling the liquid in the groove 18 is insufficient. As a result, the inflow unevenness in the flowing plate width direction when the cleaning liquid flows from the inclined plate portion 9A into the groove 18 is caused by the flowing liquid in the flowing plate width direction when the cleaning liquid flows from the groove 18 to the cleaning exhaust flow path 10. The area of the groove 18 remaining as a place where the wash-out paint remains is reduced as much as possible while preventing the flow-out unevenness from remaining.
[0050]
Furthermore, the liquid depth D of the groove 18 is in the range of 10 mm to 20 mm (D = 20 mm is employed in this example), thereby reducing the disturbance of the groove pool cleaning liquid W due to the influence of the air flow, Stabilizing the outflow of the cleaning liquid from the groove 18 to the cleaning exhaust flow path 10, and allowing a large amount of the wash-off paint flowing into the groove 18 to be smoothly discharged to the cleaning exhaust flow path 10 together with the cleaning liquid W, The aim is to achieve both suppression of the accumulation of paint in the groove 18.
[0051]
That is, by setting the length L2 of the groove 18 in the cleaning liquid flowing direction and the liquid depth D of the groove 18 as described above, the work of removing the paint remaining in the groove 18 can be made easy and light. Uniformity of the outflow cleaning liquid W in the width direction of the falling plate when the cleaning liquid flows out to the cleaning exhaust flow path 10 is achieved more effectively.
[0052]
[Another embodiment]
Next, another embodiment of the invention will be listed.
As the cleaning liquid W, various substances such as water, water to which an appropriate chemical is added, and a liquid other than water can be applied.
[0053]
The specific flow path structure of the cleaning exhaust flow path 10 is not limited to the structure shown in FIGS. 1 to 3 described above, and various other flow path structures can be adopted.
[0054]
The cleaning liquid supply structure to the upstream side of the cleaning liquid flow-down plate 9 is different from the above-described embodiment in that the cleaning liquid supply gutter 13 of a type in which the cleaning liquid W flows out from the bottom of the gutter is provided. Various other types of cleaning liquid supply structures can be employed, such as providing a full length overflow type cleaning liquid supply gutter for supplying the cleaning liquid W onto the cleaning liquid flowing down plate 9 in a form in which W overflows.
[0055]
The object to be coated is not limited to the automobile body, but may be any other object such as an electric appliance casing.
[0056]
Incidentally, reference numerals are written in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the attached drawings by the entry.
[Brief description of the drawings]
FIG. 1 is an overall sectional view of a painting booth.
FIG. 2 is an enlarged plan view
FIG. 3 is an enlarged cross-sectional view of a cleaning liquid flowing down plate portion.
[Explanation of symbols]
W cleaning liquid
9 Washing liquid falling plate
1 spray painting work area
A Exhaust air
10 Exhaust flow path for cleaning
10a Inlet
18 Groove for storing the cleaning liquid
18w groove wall
9A Inclined plate
9w Connection
θ tilt angle
d Average liquid film thickness
L1 Length of inclined plate
L2 groove width dimension
D Groove liquid depth

Claims

A cleaning liquid flow-down plate (9) having an inclined posture for flowing the cleaning liquid (W) in a film form is provided below the spray coating work area (1),
The air (A) discharged together with the excess paint mist from the work area (1) and the washing liquid (W) flowing down from the washing liquid falling plate (9) are joined to the downstream end side of the washing liquid falling plate (9). Forming a cleaning exhaust flow path (10) to be passed in a state,
The cleaning liquid flow-down plate (9) has a cross-sectional shape in which a cleaning liquid reservoir groove (18) for directly flowing a flowing-down cleaning liquid (W) from a downstream end of an upstream inclined plate portion (9A) to a downstream end. The cleaning liquid (W) flows from the groove (18) to the cleaning exhaust channel (10) by overflowing the groove wall (18w) on the side of the cleaning exhaust channel (10) in the groove (18). A paint booth with a structure that allows
The liquid depth (D) of the groove (18) is set within a range of 10 mm to 30 mm ,
A pair of cleaning liquid flow-down plates (9) for flowing the cleaning liquid (W) from both sides toward the center below the spray coating work area (1) is provided, and downstream edges of the cleaning liquid flow-down plates (9) are provided. Forming the cleaning exhaust passage (10) between the two,
The cleaning exhaust flow path (10) has an inlet (10a) formed in a slit shape extending in the width direction of the cleaning liquid flow-down plate (9), and the slit-shaped inlet (10a) is provided with the cleaning liquid flow-down plate. (9) A plurality of lines are arranged in a line in the width direction,
A portion between the slit-shaped inlets (10a) in the width direction of the cleaning liquid flow-down plate (9) is a smooth connection portion (9w) between the two cleaning liquid flow-down plates (9),
The connecting portion (9w) is a coating booth having a structure in which the downstream edges of the inclined plate portions (9A) in both the cleaning liquid flowing-down plates (9) are connected in a smooth state with no steps .

Painting booth according to claim 1, wherein you have a groove width dimension (L2) in the range of 200mm~500mm in the cleaning solution flow-down direction of the groove (18).