JP3790320B2

JP3790320B2 - Reservoir for granular material transported by gas

Info

Publication number: JP3790320B2
Application number: JP03985797A
Authority: JP
Inventors: 彦一勝村; 憲和平田; 治松井
Original assignee: Matsui Manufacturing Co Ltd
Current assignee: Matsui Manufacturing Co Ltd
Priority date: 1997-02-06
Filing date: 1997-02-06
Publication date: 2006-06-28
Anticipated expiration: 2017-02-06
Also published as: JPH10218365A

Description

【０００１】
【発明の属する技術分野】
本発明は気体によって輸送される粉粒体（例えば、合成樹脂原料等の粉粒体）の貯留槽に関する。
【０００２】
【従来の技術】
従来、この種の貯留槽として以下の如きものは知られている。即ち、槽本体の上部に粉粒体供給口が、槽本体の下部に開閉弁によって開閉自在となされた粉粒体排出口が設けられ、槽本体の所要部に気体吸引口が設けられ、この気体吸引口が、槽本体内に設けられた、設定の大きさの粉粒体の通過は許容せず気体の通過は許容する多孔板によって、粉粒体供給口及び粉粒体排出口と画されている気体によって輸送される粉粒体の貯留槽において、前記粉粒体排出口が斜め下向き（粉粒体排出口を含む仮想傾斜面と粉粒体排出口上端部から下方に降ろした垂直面とがなす角度が９０度未満の角度となる状態）となされ、この粉粒体排出口を開閉する開閉弁が揺動アームの自由端に設けられ、前記揺動アームは槽本体に上下揺動自在に設けられると共に、揺動アームにはその揺動中心を境として開閉弁と逆側に位置するようにしてバランスウエイトが設けられ、このバランスウエイトと開閉弁とのバランスが釣り合った状態で、開閉弁と粉粒体排出口の周縁との間に所定間隙が形成されるようになされたものは知られている。
【０００３】
【従来技術の作用】
以下に従来技術の作用について説明する。
粉粒体供給口に粉粒体が貯留された粉粒体貯留源（気体流入口を有する）を接続するとともに気体吸引口に気体吸引装置を接続し、このような準備の後、気体吸引装置を作動すれば以下の作用が行なわれる。
即ち、気体吸引装置が作動する前は、バランスウエイトの働きによって完全には粉粒体排出口を閉じていない状態、即ち、粉粒体排出口との間に所定の間隙をあけて待機していた状態の開閉弁が、気体吸引装置が作動することによって貯留槽内が負圧となるため、粉粒体排出口側に吸引され、粉粒体排出口を完全に閉じることになる。その際、粉粒体排出口の周縁やそれに対向する開閉弁の部分に付着する粉粒体は両者間の間隙を通じて貯留槽内に流入する空気の流れによって上方に舞い上げられるので、開閉弁は粉粒体の噛み込みなく閉じることとなる。
その後、貯留槽内が更に負圧となるので、粉粒体供給口から気体と共に粉粒体が貯留槽内に流入し、気体は気体吸引口から出て行き、粉粒体は貯留槽内に溜められる。
そして、所定量の粉粒体が溜ると気体吸引装置を停止する。そのことによって、即ち、貯留槽内が負圧でなくなることによって、貯留された粉粒体の自重がバランスウエイトの力に打ち勝つことにより、開閉弁が開き、粉粒体は粉粒体排出口より排出される。
そして、粉粒体が完全に貯留槽より排出されると、バランスウエイトの働きによって開閉弁は前記した粉粒体排出口をほぼ閉じた状態（完全には閉じていない状態）に戻る。
【０００４】
【従来技術の欠点】
前記従来の貯留槽には以下のごとき欠点があった。
第１に、従来の貯留槽の粉粒体排出口をホッパードライヤーの頂壁に形成された粉粒体入口にガイド筒を介して接続して、貯留槽をホッパードライヤーへの粉粒体供給器として使用した場合等において、以下のごとき欠点があった。即ち、開閉弁は、気体吸引装置が作動する前は、バランスウエイトの働きによって完全には粉粒体排出口を閉じていない状態、即ち、粉粒体排出口との間に所定の間隙をあけた状態で待機しているが、ホッパードライヤー内に圧送される乾燥空気によってホッパードライヤー内の圧力が上がると、気体吸引装置が作動しないにも拘らず、開閉弁が上方に押し上げられ、その押し上げられた開閉弁と粉粒体排出口の周縁とによって粉粒体排出口の周縁やそれに対向する開閉弁の部分に付着していた粉粒体が挾まれて、粉粒体が粉粒体排出口の周縁に噛み込んだ状態で外れなくなるという欠点があった。
第２に、所定量の粉粒体が溜ると気体吸引装置を停止させた後、気体吸引装置が慣性で所定時間作動した後に完全停止し、その後、貯留槽内に大気が自然に流入して貯留槽内が自然に大気圧に復帰するのを待ち、その結果として、貯留された粉粒体の自重により開閉弁を自動的に開き、粉粒体を粉粒体排出口より排出する構造であったため、気体吸引装置を停止させてから開閉弁が完全に開いて粉粒体が排出されるまでの時間が相当に長くなり、作動効率が悪いという欠点があった。
第３に、以下の理由により、開閉弁が閉じる際において、粉粒体の噛み込みを所期の目的通り完全に防止することが出来ないという欠点があった。即ち、粉粒体排出口が斜め下向きとなされていたため、粉粒体排出口の下端部が粉粒体排出口の上端部に比較して気体吸引口より遠い位置に位置することとなり、そのため、気体吸引装置を作動させて開閉弁を完全に閉じる過程において、開閉弁と粉粒体排出口の下端部との間を通って貯留槽内に流入する空気の速度が、開閉弁と粉粒体排出口の上端部との間を通って貯留槽内に流入する空気の速度より遅くなるため、粉粒体排出口の下端部やそれに対向する開閉弁の部分に付着した粉粒体の吹き上げが十分に出来なかったり、一旦上方に舞い上げられた粉粒体が粉粒体排出口の下端部に落下したりすることにより、開閉弁が閉じる際において、粉粒体の噛み込みを所期の目的通り完全に防止することが出来ないという欠点があった。
【０００５】
【課題を解決するための手段】
本発明は前記欠点を解消するために以下の如き手段を採用した。
請求項１の発明は、槽本体の上部に粉粒体供給口が設けられ、槽本体の下部に開閉弁によって開閉自在となされた粉粒体排出口が設けられ、槽本体の所要部に気体吸引口が設けられ、気体吸引口からの気体吸引によって粉粒体供給口から槽本体内に粉粒体を供給させ、開閉弁を開いて粉粒体排出口から粉粒体を排出するようにした粉粒体の貯留槽において、粉粒体排出口が真下を向いており、槽本体に上下揺動自在に設けられている揺動アームと、揺動アームの自由端に設けられ、粉粒体排出口を開閉する開閉弁と揺動アームの揺動中心に関して前記自由端と逆側に位置するように設けられたバランスウエイトと、揺動アームと槽本体とに跨って設けられ、バランスウエイトと開閉弁との釣り合い状態を保持する保持器とを備え、保持器は、揺動アームが開閉弁を閉じる方向に揺動するのに抵抗し、開く方向に揺動するのを許容するようになされており、開閉弁がほぼ閉じる揺動位置にて開閉弁と粉粒体排出口の全周縁との間隙が等しく又はほぼ等しくなるようになされていることを特徴とする。
請求項６の発明は、前記粉粒体排出口が真下に向いているものである。
【０００６】
【発明の作用】
請求項１の発明は以下の如き作用をなすものである。
バランスウエイトと開閉弁とのバランスが釣り合った状態で、開閉弁と粉粒体排出口の全周縁との間隙が等しく又はほぼ等しく形成されるようになされ、この状態を保持する保持器が揺動アームと槽本体とに跨って設けられ、この保持器は、揺動アームが開閉弁を閉じる方向に揺動するのに抵抗するが、揺動アームが開閉弁を開く方向に揺動するのは許容するようになされているので、保持器の抵抗力を調節することによって、気体吸引口に接続された気体吸引装置が作動しないにも拘らず、開閉弁が上方に押し上げられ、その開閉弁と粉粒体排出口の周縁とによって粉粒体排出口の周縁やそれに対向する開閉弁の部分に付着していた粉粒体が挾まれて、粉粒体が粉粒体排出口の周縁に噛み込んだ状態で外れなくなるというような事態を防止することが出来る。
また、気体吸引口に接続された気体吸引装置が停止した後、保持器の作用によって強制的に開閉弁と粉粒体排出口の周縁との間に所定間隙を形成して貯留槽内に大気を導入して貯留槽内を大気圧にするものであるから、貯留槽内が自然に大気圧に復帰するまで待つ従来の貯留槽に比較して気体吸引装置を停止させてから開閉弁が完全に開いて粉粒体が排出されるまでの時間を短くして、作動効率を高めることが出来る。
請求項６の発明は以下の如き作用をなすものである。粉粒体排出口が真下に向いていて粉粒体排出口の全周縁が気体吸引口よりほぼ等しい距離となるので、貯留槽内を負圧とすることによって、粉粒体排出口の周縁やそれに対向する開閉弁の部分に付着する粉粒体を両者間の間隙を通じて貯留槽内に同一又はほぼ同一の速度で流入する空気の流れによって上方に舞い上げることが出来るので、開閉弁を粉粒体の噛み込みなく完全に閉じることが出来る。
【０００７】
【発明の実施の形態】
以下に本発明の実施の形態を図面を参照しつつ説明する。
後で詳述する貯留槽１は、そのガイド筒８をホッパードライヤー４９の頂壁５０の粉粒体入口５１に重ねるようにして、ホッパードライヤー４９の頂壁５０に取り付けられている。
前記貯留槽１の槽本体３は、上部材５と、この上部材５の下部に公知の所要個の連結具（図示略）によって連結・分離自在に連結された円筒状の胴６と、この胴６の下端に連結された下方すぼまりのテーパー筒状の下部材７と、この下部材７の上部に連結された下方に突出するガイド筒８とを有している。
【０００８】
前記上部材５は、頂壁１２と、この頂壁１２の周縁に垂下状に設けられた筒状の周壁１３とを有している。
前記頂壁１２には開口１５が形成され、この開口１５に、頂壁１２の上方から粉粒体供給管１６が接続され、頂壁１２の下方から供給筒１７が下方に向かって突出状に接続されている。供給筒１７の下部は、拡がり角度αの、下方拡がりのテーパー筒状の拡開部１７ａとなされ、この拡開部１７ａの下端が粉粒体供給口１８となされており、この粉粒体供給口１８は、上部材５の周壁１３の下縁より下に位置するようになされている。
【０００９】
前記供給筒１７を囲うかたちで、設定の大きさの粉粒体の通過は許容せず気体の通過は許容する下方拡がりのテーパー筒状の多孔板２０が、下周縁を周壁１３（槽本体３の周壁）に当接（密接）させ且つ上周縁を供給筒１７の上部又は頂壁１２に当接（密接）させるようにして、槽本体３内に設けられている。前記多孔板２０の拡がり角βは、前記拡開部１７ａの拡がり角αより大きくなされている。
前記上部材５の周壁１３には気体吸引口２２が粉粒体供給口１８より上方に位置するようにして形成され、この気体吸引口２２に排気管２３が接続されている。
【００１０】
前記下部材７の下端が、真下（ほぼ真下も含む。）を向いた粉粒体排出口２６となされている。
前記ガイド筒８の所要部に開口２８が形成され、この開口２８に嵌まるかたちで、下部材７に図１の紙面方向に所定間隔をあけるようにして一対のブラケット２９が設けられ、これらブラケット２９に枢軸３０を介して揺動ア−ム３１が上下揺動自在に設けられ、この揺動ア−ム３１の自由端に、図１の実線の状態において軸心を垂直又はほぼ垂直にしたボス状の支持筒３２が設けられ、この支持筒３２に、下端に抜け止め３４を有する軸３３が、上下微動自在で且つ支持筒３２に対して任意の向きに僅かに傾斜自在に、嵌められ、軸３３の上端に上方に向かって凸湾曲した開閉弁３７が取り付けられている。そして、軸３３の上部には、支持筒３２に対して軸３３が上下微動出来る状態で、ゴム等からなる弾性環３５が嵌められている。
このような構成によって、開閉弁３７は、粉粒体排出口２６を閉じる又はほぼ閉じる位置において僅かに上下動自在となされている。また、開閉弁３７は粉粒体排出口２６の周縁に当接した際、それから受ける力に従って粉粒体排出口２６を密閉するように所定の範囲で向きを変更し得るようになされている。
なお、開閉弁３７を揺動アーム３１に固定してもよいことは云うまでもない。
【００１１】
前記揺動ア−ム３１の、枢軸３０を境として逆側にねじ軸３９が設けられ、このねじ軸３９にバランスウエイト４０が位置調節自在にねじ嵌められ、このバランスウエイト４０は、ねじ軸３９にねじ嵌められたロックナット４１によって所定位置で固定可能となされている。即ち、バランスウエイト４０の位置を調節することによって、バランスウエイト４０と開閉弁３７とのバランスが釣り合った状態で、開閉弁３７と粉粒体排出口２６の周縁との間に所定間隙４３が形成されるようになされている。即ち、貯留槽１に負圧が作用しない状態で、図１の実線の状態、即ち、開閉弁３７が粉粒体排出口２６の周縁との間に所定の間隙４３を形成した状態となるようになされている。そして、この状態で、間隙４３の幅は、開閉弁３７の全周において、等しく又はほぼ等しくなるようになされている。そして、開閉弁３７は、貯留槽１内を負圧とすることによって、図１の実線の状態から、矢印Ｌに示すように上昇して、粉粒体排出口２６を完全に閉じるようになされている。
揺動ア−ム３１が図１の実線の状態から、反時計方向に９０度揺動した際、即ち、開閉弁３７が粉粒体排出口２６の真下から完全に退避した状態となった際、下部材７に当接するストッパ−４４が揺動ア−ム３１に設けられている。また、揺動ア−ム３１が図１の実線の状態から反時計方向に９０度揺動した際におけるバランスウエイト４０を検知する検知器４６が、下部材７に設けられたバランスウエイト４０等を囲うカバ−４７に設けられている。
【００１２】
前記バランスウエイト４０と開閉弁３７とのバランスが釣り合った状態、即ち、開閉弁３７と粉粒体排出口２６の周縁との間に所定間隙４３が形成された状態で、この状態を保持する、後で詳述する保持器５３が揺動アーム３１と槽本体３（具体的にはブラケット２９）とに跨って設けられている。
前記保持器５３は、揺動アーム３１が開閉弁３７を閉じる方向に揺動するのに抵抗するが、揺動アーム３１が開閉弁３７を開く方向に揺動するのは許容するようになされている。ここで、「揺動アーム３１が開閉弁３７を閉じる方向に揺動するのに抵抗する」とは、揺動アーム３１が開閉弁３７を閉じる方向に揺動するのを全く阻止するのではなく、開閉弁３７に作用する、開閉弁３７を閉じる方向の力が設定値以内であれば、その力に打ち勝って開閉弁３７を完全に閉じないという意味である。
また、前記したごとく、揺動アーム３１が開閉弁３７を閉じる方向に揺動しなくても、開閉弁３７自体が僅かに上下動するようになされているが、バランスウエイト４０と開閉弁３７とのバランスが釣り合った状態で、開閉弁３７が揺動アーム３１に対して一番上側に位置したとしても、開閉弁３７は粉粒体排出口２６の周縁に当接しないように、なされている。
【００１３】
前記保持器５３は、槽本体３の下部材７に設けられた一方のブラケット２９に設けられたカム板５４と、このカム板５４のカム面５４ａに当接する、揺動アーム３１に設けられた一対の支持板５５にカム面５４ａに向かって進退自在に設けられたロッド５６と、このロッド５６をカム板５４のカム面５４ａに向かう方向に押すためのばね５７とを有している。
なお、図１の状態で、ばね５７は自由長さであり圧縮力は受けていない。また、ロッド５６がカム板５４側へ抜け出さないように支持板５５に当接する抜け止め５８がロッド５６に設けられている。なお、ばね５７の両端は、ロッド５６に設けられたばね受け５９と抜け止め５８が当接する支持板５５とに当たるようになされている。
【００１４】
前記揺動アーム３１が開閉弁３７を閉じる方向（図２において時計方向）に揺動するとロッド５６がカム板５４のカム面５４ａ（下側に向かって下り傾斜しているカム面５４ａ）をばね５７の力に抗して登るようになされ、前記ロッド５６は、揺動アーム３１が開閉弁３７を開く方向（図２において反時計方向）に揺動するとカム板５４のカム面５４ａから外れるようになされている。
【００１５】
前記上部材５には多孔板２０の下向き面に付着した粉粒体を除去する所要個の洗浄気体噴出ノズル（図示略）が設けられている。これら洗浄気体噴出ノズルから洗浄気体を多孔板２０に上から吹き付けることによって、多孔板２０の下向き面に付着した粉粒体を除去することが出来る。
【００１６】
【発明の実施の形態の作用】
次に発明の実施の形態の作用を説明する。
粉粒体供給管１６に粉粒体が貯留された、気体流入口を有する粉粒体貯留源（図示略）を接続するとともに排気管２３に気体吸引装置（図示略）を接続し、このような準備の後、気体吸引装置を作動すれば以下の作用が行なわれる。
即ち、気体吸引装置が作動する前は、バランスウエイト４０の働きによって完全には粉粒体排出口２６を閉じていない状態、即ち、粉粒体排出口２６との間に所定の間隙４３をあけて待機していた状態の開閉弁３７が、気体吸引装置が作動することによって貯留槽１内が負圧となるため、粉粒体排出口２６側に吸引され、揺動ア−ム３１の揺動に伴って図１の矢印Ｌに示す如く、上方に移動して、粉粒体排出口２６を完全に閉じることになる。その際、粉粒体排出口２６の周縁やそれに対向する開閉弁３７の部分に付着する粉粒体は両者間の間隙４３を通じて貯留槽１内に流入する同一又はほぼ同一の速度の空気の流れによって同一又はほぼ同一の速度で上方に舞い上げられるので、開閉弁３７は粉粒体の噛み込みなく完全に閉じることとなる。
なお、前記作動に伴って、ロッド５６はカム板５４のカム面５４ａをばね５７の力に抗して登る。
その後、貯留槽１内が更に負圧となるので、粉粒体供給口１８から気体と共に粉粒体が貯留槽１内に流入し、気体は気体吸引口２２から出て行き、粉粒体は貯留槽１内に溜められる。
そして、所定量の粉粒体が溜ると気体吸引装置を停止する。そうすると、保持器５３の作用によって（ロッド５６がばね５７の力に従ってカム面５４ａを下ることによって）強制的に開閉弁３７と粉粒体排出口２６の周縁との間に所定間隙４３が形成されて貯留槽１内に大気が導入されて貯留槽１内は大気圧になる。それに伴って、貯留された粉粒体の自重がバランスウエイト４０の力に打ち勝ち、開閉弁３７が図１の一点鎖線の位置まで開き、粉粒体は粉粒体排出口２６より排出される。
そして、粉粒体が完全に貯留槽１より排出されると、バランスウエイト４０の働きによって開閉弁３７は粉粒体排出口２６をほぼ閉じた状態（完全には閉じていない状態）に戻る。
そして、この状態で、気体吸引装置が作動しないにも拘らず、開閉弁３７に開閉弁３７を上方に押し上げる力が作用しても、その力が設定値以内であれば、ばね５７はその力に打ち勝って開閉弁３７を完全には閉じさせない。そして、前記力（開閉弁３７に開閉弁３７を上方に押し上る力）が作用しなくなると、カム面５４ａの作用によって開閉弁３７は粉粒体排出口２６の周縁との間に所定間隙４３をあけた状態に戻る。
【００１７】
【変形例等】
以下に変形例等について説明を加える。
（１）粉粒体には、粉体・粒体・微小薄片・短繊維片等が含まれる。
（２）多孔板２０は、要するに設定の大きさの粉粒体の通過は許容せず気体の通過は許容するものであればよい。即ち、多孔板２０にはフィルターや網も含まれるものである。また、多孔板２０の形状は、下方拡がりのテーパー筒状に限らず、下端に張出鍔を有する筒状等であってもよい。
（３）供給筒１７の拡開部１７ａはなくてもよい。また、拡開部１７ａを含む供給筒１７を多孔板によって構成するようにしてもよい。
（４）開閉弁３７は、単なる平板や円錐形状のものあってもよい。
（５）保持器５３を、揺動アーム３１に設けられたカム板５４と、このカム板５４のカム面５４ａに当接する、槽本体３（ブラケット２９）にカム面５４ａに対して進退自在に設けられたロッド５６と、このロッド５６をカム板５４のカム面５４ａに向かう方向に押すためのばね５７とで構成し、揺動アーム３１が開閉弁３７を閉じる方向に揺動するとカム板５４のカム面５４ａがロッド５６をばね５７の力に抗して押すようにし、前記カム板５４は、揺動アーム３１が開閉弁３７を開く方向に揺動するとロッド５６から外れるようにしてもよい。なお、この場合、カム板５４は、図２の状態から、上下反転させられ且つ左右反転させられた状態となされる。
また、図４に示すごとく、前記保持器５３を、揺動アーム３１が開閉弁３７を閉じる方向に揺動するのに抵抗するが、揺動アーム３１が開閉弁３７を開く方向に揺動するのは許容する揺動アーム３１と槽本体３（具体的にはカバー４７）とに渡された引っ張りばね６０によって構成してもよい。引っ張りばね６０は、図４の状態で、自由長であり、引っ張り力は作用していない。
【００１８】
【発明の効果】
本発明は前記した如き構成によって以下の如き効果を奏するものである。
請求項１〜５の発明によれば、バランスウエイトと開閉弁とのバランスが釣り合った状態で、開閉弁と粉粒体排出口の周縁との間に所定間隙が形成されるようになされ、この状態を保持する保持器が揺動アームと槽本体とに跨って設けられ、この保持器は、揺動アームが開閉弁を閉じる方向に揺動するのに抵抗するが、揺動アームが開閉弁を開く方向に揺動するのは許容するようになされているので、保持器の抵抗力を調節することによって、気体吸引口に接続された気体吸引装置が作動しないにも拘らず、開閉弁が上方に押し上げられ、その開閉弁と粉粒体排出口の周縁とによって粉粒体排出口の周縁やそれに対向する開閉弁の部分に付着していた粉粒体が挾まれて、粉粒体が粉粒体排出口の周縁に噛み込んだ状態で外れなくなるというような事態を防止することが出来る。
請求項１〜５の発明によれば、気体吸引口に接続された気体吸引装置が停止した後、保持器の作用によって強制的に開閉弁と粉粒体排出口の周縁との間に所定間隙を形成して貯留槽内に大気を導入して貯留槽内を大気圧にするものであるから、貯留槽内が自然に大気圧に復帰するまで待つ従来の貯留槽に比較して気体吸引装置を停止させてから開閉弁が完全に開いて粉粒体が排出されるまでの時間を短くして、作動効率を高めることが出来る。
請求項６の発明によれば、粉粒体排出口が真下に向いていて粉粒体排出口の全周縁が気体吸引口よりほぼ等しい距離となるので、貯留槽内を負圧とすることによって、粉粒体排出口の周縁やそれに対向する開閉弁の部分に付着していた粉粒体を両者間の間隙を通じて貯留槽内に同一又はほぼ同一の速度で流入する空気の流れによって上方に舞い上げることが出来るので、開閉弁を粉粒体の噛み込みなく完全に閉じることが出来る。また、粉粒体排出口が真下に向いているので、開閉弁を粉粒体排出口の真下から完全に退避させることによって、粉粒体排出口からその真下に粉粒体をスムーズに排出することが出来る。
請求項７の発明によれば、開閉弁が上方に向かって凸湾曲しているので、揺動アームに設けられた開閉弁が粉粒体排出口の周縁に密接しやすい。
請求項８の発明によれば、粉粒体供給口から槽本体内に供給された粉粒体は下に向かって落下しようとするものであり、他方、気体は槽本体内に設けられた供給筒の側方を囲う多孔板を通って気体吸引口（粉粒体供給口より上方に位置するもの）に向かって上昇するものであるから、粉粒体と気体との分離を効率よく行なうことが出来、その結果として、粉粒体による多孔板の目詰まりを少なくすることが出来る。
請求項９の発明によれば、供給筒の下部が下方拡がりのテーパー筒状の拡開部となされているので、粉粒体供給口における気体と粉粒体との噴出速度を遅くして、粉粒体と気体との分離を効率よく行なうことが出来る。また、下方拡がりのテーパー筒状の拡開部が下方拡がりのテーパー筒状の多孔板の拡がり角度より小さい拡がり角度となされているので、即ち、テーパー筒状の多孔板と拡開部との間隙が下方程広くなるようになされているので、たとえば、気体吸引口側から洗浄気体を噴出して多孔板に付着した粉粒体を除去するようにした場合において、その除去されて落下する粉粒体が拡開部の上部に積もりにくくして、粉粒体の落下を確実に行なうことが出来る。また、多孔板が下方拡がりのテーパー筒状であるので、水平な多孔板に比較して面積を広く出来、その結果、目詰まりを起こりにくくすることが出来る。
【図面の簡単な説明】
【図１】本発明の実施の形態を示す縦断面図である。
【図２】図１のＡ部分の拡大図である。
【図３】図２のＩＩＩ−ＩＩＩ線断面図である。
【図４】本発明の変形例を示す要部縦断面図である。
【符号の説明】
１貯留槽
３槽本体
１８粉粒体供給口
２０多孔板
２２気体吸引口
２６粉粒体排出口
３１揺動アーム
３７開閉弁
４０バランスウェイト
４３間隙
５３保持器
５４カム板
５４ａカム面
５５支持板
５６ロッド
５７ばね
５８抜け止め[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a storage tank for granular materials (for example, granular materials such as synthetic resin raw materials) transported by gas.
[0002]
[Prior art]
Conventionally, the following are known as this type of storage tank. That is, the powder body supply port is provided at the upper part of the tank body, the powder body discharge port that can be opened and closed by an opening / closing valve is provided at the lower part of the tank body, and the gas suction port is provided at a required part of the tank body. The gas suction port is provided in the tank body, and the granular material supply port and the granular material discharge port are separated from the granular material supply port and the granular material discharge port by a perforated plate which does not allow the passage of the granular material of the set size and allows the passage of gas. In the storage tank of the granular material transported by the gas that is being transported, the granular material discharge port is obliquely downward (vertical inclined surface including the granular material discharge port and the vertical lowered from the upper end portion of the granular material discharge port And an opening / closing valve that opens and closes the particulate discharge port is provided at the free end of the swing arm, and the swing arm swings up and down on the tank body. It is provided so that it can move freely. A balance weight is provided so as to be positioned, and a predetermined gap is formed between the on-off valve and the periphery of the granular material discharge port in a state where the balance between the balance weight and the on-off valve is balanced. Things are known.
[0003]
[Operation of the prior art]
The operation of the prior art will be described below.
Connect the powder storage source (having the gas inlet) where the powder is stored in the powder supply port and connect the gas suction device to the gas suction port. After such preparation, the gas suction device When the is operated, the following actions are performed.
That is, before the gas suction device is operated, the powder discharge port is not completely closed by the balance weight, i.e., a predetermined gap is left between the powder discharge port and the gas suction device. When the gas suction device operates, the open / close valve in the closed state has a negative pressure in the storage tank, and is thus sucked to the powder particle discharge port side to completely close the particle discharge port. At that time, the granular material adhering to the periphery of the granular material discharge port or the part of the on-off valve facing it is swung up by the flow of air flowing into the storage tank through the gap between the two, so the on-off valve is It closes without biting the powder.
After that, since the inside of the storage tank becomes further negative pressure, the granular material flows into the storage tank together with the gas from the granular material supply port, the gas goes out from the gas suction port, and the granular material enters the storage tank. Can be stored.
And if a predetermined amount of granular material accumulates, a gas suction device will be stopped. As a result, the internal pressure of the stored granular material overcomes the force of the balance weight by eliminating the negative pressure inside the storage tank, and the on-off valve opens, and the granular material is discharged from the granular material discharge port. Discharged.
When the granular material is completely discharged from the storage tank, the opening / closing valve returns to the state in which the above-described granular material discharge port is substantially closed (the state is not completely closed) by the action of the balance weight.
[0004]
[Disadvantages of the prior art]
The conventional storage tank has the following drawbacks.
1stly, the granular material discharge port of the conventional storage tank is connected to the granular material inlet formed in the top wall of the hopper dryer via a guide cylinder, and the storage tank is supplied with the granular material to the hopper dryer. When used as, etc., there were the following drawbacks. That is, the open / close valve is not completely closed by the function of the balance weight before the gas suction device is operated, that is, a predetermined gap is formed between the open / close valve and the granular material discharge port. However, when the pressure inside the hopper dryer is increased by the dry air fed into the hopper dryer, the open / close valve is pushed up and pushed up even though the gas suction device does not operate. The granular material adhering to the periphery of the granular material discharge port or the portion of the open / close valve opposite to it is swollen by the open / close valve and the peripheral edge of the granular material discharge port, and the granular material is discharged to the granular material discharge port There was a drawback that it could not come off in the state of being bitten in the periphery of the.
Second, after a predetermined amount of powder has accumulated, the gas suction device is stopped, then the gas suction device is completely stopped after operating for a predetermined time by inertia, and then the air naturally flows into the storage tank. It waits for the inside of the storage tank to return to atmospheric pressure naturally, and as a result, the on-off valve is automatically opened by the dead weight of the stored granular material, and the granular material is discharged from the granular material discharge port. Therefore, there is a drawback that the time from when the gas suction device is stopped to when the on-off valve is completely opened and the granular material is discharged becomes considerably long, and the operation efficiency is poor.
Thirdly, for the following reason, when the on-off valve is closed, there is a drawback that it is not possible to completely prevent the powder particles from being bitten as intended. That is, since the granular material discharge port was inclined downward, the lower end portion of the granular material discharge port is located at a position farther from the gas suction port than the upper end portion of the granular material discharge port. In the process of completely closing the on-off valve by operating the gas suction device, the speed of the air flowing into the storage tank through the gap between the on-off valve and the lower end of the granular material discharge port is determined by the on-off valve and the granular material. Since it becomes slower than the speed of the air flowing into the storage tank through the upper end of the discharge port, the powder adhering to the lower end of the particle discharge port and the part of the on-off valve facing it is blown up. When the on-off valve closes due to the fact that the granular material that has not been sufficiently raised or has been swollen upward and falls to the lower end of the granular material discharge port, There was a drawback that it could not be completely prevented as intended.
[0005]
[Means for Solving the Problems ]
The present invention employs the following means in order to eliminate the above disadvantages.
In the first aspect of the present invention, the powder body supply port is provided at the upper part of the tank body, the powder body discharge port which is opened and closed by an on-off valve is provided at the lower part of the tank body, and gas is supplied to the required part of the tank body. A suction port is provided, so that the powder is supplied from the powder supply port into the tank body by gas suction from the gas suction port, and the on-off valve is opened to discharge the powder from the powder discharge port. In the storage tank for the granular material, the granular material discharge port faces directly below, the swing arm provided in the tank main body so as to be swingable up and down, and provided at the free end of the swing arm. An open / close valve that opens and closes the body discharge port, a balance weight provided to be opposite to the free end with respect to the swing center of the swing arm, and a balance weight provided across the swing arm and the tank body And a retainer that maintains a balanced state between the on-off valve and the retainer, Movement arm is resistance to swing in a direction of closing the on-off valve open direction being adapted to allow the swung-off valve and the powder or granular material discharge off valve at substantially closed swing position It is characterized in that the gap with the entire periphery of the outlet is made equal or substantially equal.
According to a sixth aspect of the present invention, the particulate discharge port is directed downward.
[0006]
[Effects of the Invention]
The invention of claim 1 has the following effects.
In a state in which balance is commensurate with the balance weight and the on-off valve, adapted between gap the entire periphery of the opening and closing valve and the powder or granular material discharge port is equal to or substantially equal form, cage holding the state rocking This cage is provided across the moving arm and the tank body, and this cage resists the swinging arm swinging in the direction of closing the on-off valve, but the swinging arm swings in the direction of opening the on-off valve. Since the gas suction device connected to the gas suction port does not operate by adjusting the resistance force of the cage, the on-off valve is pushed upward and the on-off valve is adjusted. And the peripheral edge of the granular material discharge port, the granular material adhering to the peripheral edge of the granular material discharge port and the part of the on-off valve facing it is swallowed, and the granular material is placed on the peripheral edge of the granular material discharge port Prevents a situation where it cannot be removed when it is bitten Rukoto can be.
In addition, after the gas suction device connected to the gas suction port stops, a predetermined gap is forcibly formed between the opening / closing valve and the peripheral edge of the granular material discharge port by the action of the cage, and the atmosphere in the storage tank Since the inside of the storage tank is introduced to atmospheric pressure, the on-off valve is completely closed after the gas suction device is stopped compared to the conventional storage tank that waits until the inside of the storage tank naturally returns to atmospheric pressure. The operating time can be improved by shortening the time until the powder and granular material are discharged.
The invention of claim 6 has the following effects. Since the granular material discharge port faces directly below and the entire peripheral edge of the granular material discharge port is approximately the same distance as the gas suction port, by setting the inside of the storage tank to a negative pressure, the peripheral edge of the granular material discharge port Since the granular material adhering to the part of the opening / closing valve facing it can be lifted upward by the flow of air flowing into the storage tank through the gap between them at the same or almost the same speed, It can be completely closed without biting the body.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
The storage tank 1, which will be described in detail later, is attached to the top wall 50 of the hopper dryer 49 so that the guide cylinder 8 is overlapped with the granular material inlet 51 of the top wall 50 of the hopper dryer 49.
The tank body 3 of the storage tank 1 includes an upper member 5, a cylindrical body 6 that is connected to a lower portion of the upper member 5 by a known required connecting tool (not shown) so as to be connected and separated. The lower member 7 has a tapered cylindrical shape that is connected to the lower end of the body 6, and a guide tube 8 that protrudes downward and is connected to the upper portion of the lower member 7.
[0008]
The upper member 5 has a top wall 12 and a cylindrical peripheral wall 13 provided in a suspended manner on the periphery of the top wall 12.
An opening 15 is formed in the top wall 12, and a powder supply pipe 16 is connected to the opening 15 from above the top wall 12, and a supply cylinder 17 projects downward from the bottom of the top wall 12. It is connected. The lower part of the supply cylinder 17 is a tapered cylindrical expansion part 17a having a downward expansion angle α, and the lower end of the expansion part 17a is a granular material supply port 18, and this granular material supply The mouth 18 is positioned below the lower edge of the peripheral wall 13 of the upper member 5.
[0009]
In the form of surrounding the supply cylinder 17, a tapered cylindrical perforated plate 20 that expands downward and does not allow the passage of a granular material of a set size but allows the passage of gas has a lower peripheral edge around the peripheral wall 13 (the tank body 3. Is provided in the tank body 3 so as to abut (closely contact) the upper peripheral edge with the upper portion of the supply tube 17 or the top wall 12. The spread angle β of the porous plate 20 is larger than the spread angle α of the expanded portion 17a.
A gas suction port 22 is formed on the peripheral wall 13 of the upper member 5 so as to be positioned above the powder supply port 18, and an exhaust pipe 23 is connected to the gas suction port 22.
[0010]
A lower end of the lower member 7 is a granular material discharge port 26 facing directly below (including almost directly below).
An opening 28 is formed in a required portion of the guide cylinder 8, and a pair of brackets 29 are provided on the lower member 7 so as to be spaced apart from each other in the paper surface direction of FIG. A swing arm 31 is provided at 29 through a pivot 30 so as to be swingable up and down. The free end of the swing arm 31 has its axis vertically or substantially vertical in the state of the solid line in FIG. A boss-like support cylinder 32 is provided, and a shaft 33 having a stopper 34 at the lower end is fitted to the support cylinder 32 so as to be slightly movable up and down and slightly tiltable in any direction with respect to the support cylinder 32. On the upper end of the shaft 33, an on-off valve 37 that is convexly curved upward is attached. An elastic ring 35 made of rubber or the like is fitted to the upper portion of the shaft 33 so that the shaft 33 can be finely moved up and down with respect to the support cylinder 32.
With such a configuration, the on-off valve 37 is slightly movable up and down at a position where the powder outlet 26 is closed or substantially closed. Further, when the on-off valve 37 abuts on the peripheral edge of the granular material discharge port 26, the opening / closing valve 37 can change the direction within a predetermined range so as to seal the granular material discharge port 26 according to the force received from the opening / closing valve 37.
Needless to say, the on-off valve 37 may be fixed to the swing arm 31.
[0011]
A screw shaft 39 is provided on the opposite side of the oscillating arm 31 with respect to the pivot 30, and a balance weight 40 is screwed onto the screw shaft 39 so that the position of the balance weight 40 is adjustable. It can be fixed at a predetermined position by a lock nut 41 that is screwed onto the screw. That is, by adjusting the position of the balance weight 40, a predetermined gap 43 is formed between the on-off valve 37 and the peripheral edge of the granular material discharge port 26 in a state where the balance between the balance weight 40 and the on-off valve 37 is balanced. It is made to be done. That is, in a state where no negative pressure is applied to the storage tank 1, the state shown by the solid line in FIG. 1, that is, the state where the opening / closing valve 37 forms a predetermined gap 43 between the periphery of the granular material discharge port 26. Has been made. In this state, the width of the gap 43 is made equal or substantially equal over the entire circumference of the on-off valve 37. And the on-off valve 37 is made to rise as shown by the arrow L from the state of the solid line of FIG. 1 by making the inside of the storage tank 1 into a negative pressure, and the granular material discharge port 26 is completely closed. ing.
When the swing arm 31 swings 90 degrees counterclockwise from the solid line state of FIG. 1, that is, when the on-off valve 37 is completely retracted from directly below the powder outlet 26. A stopper 44 that contacts the lower member 7 is provided on the swing arm 31. A detector 46 that detects the balance weight 40 when the swing arm 31 swings 90 degrees counterclockwise from the solid line state in FIG. It is provided in the covering 47.
[0012]
This state is maintained in a state in which the balance between the balance weight 40 and the on-off valve 37 is balanced, that is, in a state in which the predetermined gap 43 is formed between the on-off valve 37 and the peripheral edge of the granular material discharge port 26. A cage 53, which will be described in detail later, is provided across the swing arm 31 and the tank body 3 (specifically, the bracket 29).
The retainer 53 resists the swing arm 31 from swinging in the direction to close the on-off valve 37, but allows the swing arm 31 to swing in the direction to open the on-off valve 37. Yes. Here, “resisting the swing arm 31 swinging in the direction of closing the on-off valve 37” does not prevent the swing arm 31 from swinging in the direction of closing the on-off valve 37 at all. If the force acting on the on-off valve 37 in the direction of closing the on-off valve 37 is within a set value, it means that the force is overcome and the on-off valve 37 is not completely closed.
In addition, as described above, even if the swing arm 31 does not swing in the direction to close the on-off valve 37, the on-off valve 37 itself is slightly moved up and down, but the balance weight 40, the on-off valve 37, Even if the on-off valve 37 is positioned on the uppermost side with respect to the swing arm 31 in a state where the balance of the valve is balanced, the on-off valve 37 is configured not to contact the peripheral edge of the granular material discharge port 26. .
[0013]
The retainer 53 is provided on the swing arm 31 that is in contact with the cam plate 54 provided on one bracket 29 provided on the lower member 7 of the tank body 3 and the cam surface 54 a of the cam plate 54. A rod 56 is provided on the pair of support plates 55 so as to be able to advance and retract toward the cam surface 54 a, and a spring 57 for pushing the rod 56 in the direction toward the cam surface 54 a of the cam plate 54.
In addition, in the state of FIG. 1, the spring 57 is free length and is not receiving the compression force. Further, the rod 56 is provided with a stopper 58 that contacts the support plate 55 so that the rod 56 does not slip out to the cam plate 54 side. Note that both ends of the spring 57 come into contact with a spring plate 59 provided on the rod 56 and a support plate 55 with which the retaining member 58 contacts.
[0014]
When the swing arm 31 swings in the direction of closing the on-off valve 37 (clockwise in FIG. 2), the rod 56 springs the cam surface 54a of the cam plate 54 (the cam surface 54a inclined downward toward the lower side). The rod 56 is made to climb against the force of 57, and the rod 56 is disengaged from the cam surface 54a of the cam plate 54 when the swing arm 31 swings in the direction to open the on-off valve 37 (counterclockwise in FIG. 2). Has been made.
[0015]
The upper member 5 is provided with a required number of cleaning gas ejection nozzles (not shown) for removing particles adhering to the downward surface of the porous plate 20. By spraying the cleaning gas onto the porous plate 20 from above from the cleaning gas jet nozzles, it is possible to remove the powder particles adhering to the downward surface of the porous plate 20.
[0016]
Operation of the Embodiment of the Invention
Next, the operation of the embodiment of the invention will be described.
A powder storage source (not shown) having a gas inlet, in which powder is stored in the powder supply pipe 16, is connected, and a gas suction device (not shown) is connected to the exhaust pipe 23. After the preparation, if the gas suction device is operated, the following actions are performed.
That is, before the gas suction device is activated, the balance weight 40 does not completely close the powder discharge port 26, that is, a predetermined gap 43 is formed between the powder discharge port 26. The on-off valve 37 in the standby state is suctioned to the granular material discharge port 26 side because the inside of the storage tank 1 becomes negative pressure by the operation of the gas suction device, and the swing arm 31 is swung. With the movement, as shown by the arrow L in FIG. 1, the powder body moves upward, and the granular material discharge port 26 is completely closed. At that time, the granular material adhering to the peripheral edge of the granular material discharge port 26 or the portion of the on-off valve 37 opposed thereto flows into the storage tank 1 through the gap 43 between them, and the air flow at the same or substantially the same speed. Therefore, the on-off valve 37 is completely closed without biting the granular material.
In association with the operation, the rod 56 climbs the cam surface 54a of the cam plate 54 against the force of the spring 57.
Then, since the inside of the storage tank 1 becomes further negative pressure, the granular material flows into the storage tank 1 together with the gas from the granular material supply port 18, the gas goes out from the gas suction port 22, and the granular material is It is stored in the storage tank 1.
And if a predetermined amount of granular material accumulates, a gas suction device will be stopped. Then, the predetermined gap 43 is forcibly formed between the on-off valve 37 and the peripheral edge of the granular material discharge port 26 by the action of the cage 53 (by the rod 56 descending the cam surface 54a according to the force of the spring 57). Thus, the atmosphere is introduced into the storage tank 1 and the inside of the storage tank 1 becomes atmospheric pressure. Along with this, the weight of the stored granular material overcomes the force of the balance weight 40, the on-off valve 37 opens to the position of the one-dot chain line in FIG. 1, and the granular material is discharged from the granular material discharge port 26.
When the granular material is completely discharged from the storage tank 1, the on / off valve 37 returns to a state in which the granular material discharge port 26 is substantially closed (a state in which it is not completely closed) by the action of the balance weight 40.
In this state, even if the gas suction device does not operate, even if a force that pushes the on-off valve 37 upward acts on the on-off valve 37, if the force is within the set value, the spring 57 will Therefore, the on-off valve 37 is not completely closed. When the force (force that pushes up the opening / closing valve 37 upward) does not act on the opening / closing valve 37, the opening / closing valve 37 is separated from the peripheral edge of the granular material discharge port 26 by the action of the cam surface 54a. Return to the opened state.
[0017]
[Modifications]
A description will be given below of modifications and the like.
(1) The granular material includes powder, granular material, fine thin piece, short fiber piece and the like.
(2) The perforated plate 20 may be any material as long as it does not allow passage of a granular material having a set size and allows passage of gas. That is, the porous plate 20 includes a filter and a net. Further, the shape of the porous plate 20 is not limited to a downwardly expanding tapered cylindrical shape, and may be a cylindrical shape having a protruding ridge at the lower end.
(3) The expanding portion 17a of the supply cylinder 17 may not be provided. Moreover, you may make it comprise the supply cylinder 17 containing the expansion part 17a with a perforated plate.
(4) The on-off valve 37 may be a simple flat plate or a cone.
(5) The cage 53 abuts on the cam plate 54 provided on the swing arm 31 and the cam surface 54a of the cam plate 54 so that the tank body 3 (bracket 29) can move forward and backward with respect to the cam surface 54a. A rod 56 provided and a spring 57 for pushing the rod 56 in a direction toward the cam surface 54a of the cam plate 54, and the cam plate 54 when the swing arm 31 swings in a direction to close the on-off valve 37. The cam surface 54a may push the rod 56 against the force of the spring 57, and the cam plate 54 may be disengaged from the rod 56 when the swing arm 31 swings in the direction to open the on-off valve 37. . In this case, the cam plate 54 is turned upside down from the state shown in FIG.
As shown in FIG. 4, the retainer 53 resists the swing arm 31 from swinging in the direction to close the on-off valve 37, but the swing arm 31 swings in the direction to open the on-off valve 37. This may be constituted by a tension spring 60 passed between the swinging arm 31 to be allowed and the tank body 3 (specifically, the cover 47). The tension spring 60 has a free length in the state shown in FIG. 4, and no tension force is applied.
[0018]
【The invention's effect】
The present invention has the following effects by the configuration as described above.
According to the invention of 請 Motomeko 1-5, in a state of balanced balanced with the balance weight and the on-off valve, adapted to a predetermined gap is formed between the periphery of the opening and closing valve and the powder or granular material discharge port, A retainer for holding this state is provided across the swing arm and the tank body, and this retainer resists the swing arm from swinging in the direction of closing the on-off valve, but the swing arm opens and closes. Since the valve is allowed to swing in the opening direction, the open / close valve is adjusted by adjusting the resistance of the cage, even though the gas suction device connected to the gas suction port does not operate. Is pushed upward, and the granular material adhering to the peripheral edge of the granular material discharge port and the opening / closing valve facing it is swollen by the opening / closing valve and the peripheral edge of the granular material discharge port. Will not come off when biting into the periphery of the powder outlet Such a situation can be prevented.
According to the invention of 請 Motomeko 1-5, after gas suction device connected to the gas suction port is stopped, a predetermined between the peripheral edge of the forced opening and closing valve and the powder or granular material discharge port by the action of the retainer Since a gap is formed and the atmosphere is introduced into the storage tank to bring the inside of the storage tank to atmospheric pressure, gas suction is performed compared to a conventional storage tank that waits until the inside of the storage tank naturally returns to atmospheric pressure. It is possible to shorten the time from when the apparatus is stopped until the on-off valve is completely opened and the granular material is discharged, thereby increasing the operation efficiency.
According to the invention of 請 Motomeko 6, so be oriented beneath the powder or granular material outlet entire periphery of the granular material outlet is substantially equal to the distance from the gas suction port, to the storage tank and the negative pressure By the above, the powder particles adhering to the peripheral edge of the powder particle discharge port or the opening / closing valve part facing it are moved upward by the air flow flowing into the storage tank through the gap between them at the same or substantially the same speed. Since it can be lifted up, the on-off valve can be completely closed without biting the granular material. In addition, since the powder outlet is facing directly below, the powder can be discharged smoothly from the powder outlet to the outlet by completely retracting the on-off valve from directly below the powder outlet. I can do it.
According to the invention of 請 Motomeko 7, since the opening and closing valve is convexly curved upward, on-off valve provided in the oscillating arm tends to close the periphery of the granular material outlet.
According to the invention of 請 Motomeko 8, has been granule fed into the tank body from granular material supply opening is intended to fall towards the bottom, while the gas is provided in the tank body Since it rises toward the gas suction port (those located above the powder supply port) through the perforated plate surrounding the side of the supply cylinder, the powder and gas are efficiently separated. As a result, clogging of the perforated plate by the granular material can be reduced.
According to the invention of 請 Motomeko 9, the bottom of the supply tube is made a tapered cylindrical widened portion of the lower spread, and slow down the ejection speed of the gas and the powder or granular material in the granular material supply opening In addition, it is possible to efficiently separate the granular material and the gas. Further, since the downwardly expanding tapered cylindrical expanded portion has an expansion angle smaller than the expanded angle of the downwardly expanded tapered cylindrical porous plate, that is, the gap between the tapered cylindrical porous plate and the expanded portion. Since, for example, the cleaning gas is ejected from the gas suction port side to remove the granular material adhering to the perforated plate, the granular material that is removed and dropped. It is difficult for the body to accumulate on the upper part of the expanded portion, and the powder particles can be reliably dropped. In addition, since the perforated plate has a tapered cylindrical shape that expands downward, the area can be increased compared to a horizontal perforated plate, and as a result, clogging can be prevented from occurring.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.
FIG. 2 is an enlarged view of a portion A in FIG.
3 is a cross-sectional view taken along line III-III in FIG.
FIG. 4 is a longitudinal sectional view of an essential part showing a modification of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Storage tank 3 Tank main body 18 Granule supply port 20 Porous plate 22 Gas suction port 26 Powder discharge port 31 Swing arm 37 On-off valve 40 Balance weight 43 Gap 53 Cage 54 Cam plate 54a Cam surface 55 Support plate 56 Rod 57 Spring 58 Retaining

Claims

A powder supply port is provided at the top of the tank body, a powder discharge port that can be opened and closed by an open / close valve is provided at the bottom of the tank body, a gas suction port is provided at a required portion of the tank body, and a gas A storage tank for powder that is supplied from the powder supply port into the tank body by gas suction from the suction port and opens the on-off valve to discharge the powder from the powder discharge port. In
The powder outlet is directly below,
A swing arm provided on the tank body to be swingable up and down;
An open / close valve provided at the free end of the swing arm to open and close the powder outlet
A balance weight provided on the opposite side of the free end with respect to the swing center of the swing arm;
A cage that is provided across the swing arm and the tank body and holds the balance between the balance weight and the on-off valve;
With
The cage resists the swinging arm swinging in the closing direction of the on-off valve and allows the swinging arm to swing in the opening direction. And a granule storage tank characterized in that the gap between the outer periphery and the entire periphery of the granule outlet is equal or substantially equal.

The powder body supply port is provided at the upper part of the tank body, the powder body discharge port that is opened and closed by an on-off valve is provided at the lower part of the tank body, and the gas suction port is provided at the required part of the tank body. The mouth is defined as a powder supply port and a powder discharge port by a perforated plate provided in the tank body that does not allow the passage of powder particles of a set size and allows the passage of gas. In the storage tank of the granular material transported by the gas that is being transported, an opening / closing valve for opening and closing the granular material discharge port is provided at the free end of the swing arm, and the swing arm is provided swingably up and down on the tank body In addition, the swing arm is provided with a balance weight so as to be located on the opposite side of the open / close valve with the swing center as a boundary, and in a state where the balance between the balance weight and the open / close valve is balanced, A predetermined gap is formed between the periphery of the powder outlet A retainer that holds this state is provided across the swing arm and the tank body, and this retainer resists the swing arm from swinging in the direction of closing the on-off valve. The movable arm is allowed to swing in the opening direction of the on- off valve, and the gap between the on-off valve and the entire periphery of the granular material discharge port is equal or substantially at the swing position where the on-off valve is almost closed. A storage tank for granular materials characterized by being equalized .

The cage includes a cam plate provided in the tank body, a rod that is in contact with the cam surface of the cam plate, and is provided on a swing arm so as to be movable forward and backward with respect to the cam surface. A spring for pushing in the direction toward the surface, and when the swing arm swings in the direction to close the on-off valve, the rod climbs the cam surface of the cam plate against the force of the spring. 3. The storage tank for granular material transported by gas according to claim 1, wherein the rod is detached from the cam surface of the cam plate when the swing arm swings in a direction to open the on-off valve.

The cage includes a cam plate provided on the swing arm, a rod provided in a tank body that contacts the cam surface of the cam plate so as to be able to advance and retract relative to the cam surface, and the rod as a cam surface of the cam plate. And when the swing arm swings in the direction to close the on-off valve, the cam surface of the cam plate pushes the rod against the force of the spring. 3. A storage tank for granular material transported by gas according to claim 1, wherein the plate is detached from the rod when the swing arm swings in a direction to open the on-off valve.

The cage resists the swing arm from swinging in the direction to close the on-off valve, but the swing arm is allowed to swing in the direction to open the on-off valve. The storage tank of the granular material transported by the gas according to claim 1, wherein the storage tank is a spring that has been made.

The storage tank of the granular material conveyed by the gas in any one of Claims 1-5 in which the said granular material discharge port has faced right below.

The storage tank of the granular material transported by the gas according to any one of claims 1 to 6 , wherein the on-off valve is convexly curved upward.

A supply cylinder is provided in an opening formed in the top wall of the tank body so as to protrude downward, and a lower end of the supply cylinder serves as a granular material supply port, and a perforated plate surrounding the side of the supply cylinder is provided. The lower peripheral edge is in contact with the peripheral wall of the tank body, and the upper peripheral edge is in contact with the upper part of the supply cylinder or the top wall of the tank body, and the gas suction port is supplied with powder. The storage tank of the granular material conveyed with the gas in any one of Claims 2-7 provided in the upper part of the tank main body so that it may be located above a mouth.

9. The perforated plate according to claim 8 , wherein the perforated plate is formed in a tapered cylindrical shape that expands downward, and a lower portion of the supply tube is formed as a tapered tubular expanded portion that expands downward with an expansion angle smaller than the expansion angle of the perforated plate. A storage tank for granular materials transported by gas.