JP3640002B2

JP3640002B2 - Rotary drum dryer

Info

Publication number: JP3640002B2
Application number: JP15004096A
Authority: JP
Inventors: 公博野中; 昌利池ケ谷
Original assignee: Okawara Mfg Co Ltd
Current assignee: Okawara Mfg Co Ltd
Priority date: 1996-05-21
Filing date: 1996-05-21
Publication date: 2005-04-20
Anticipated expiration: 2016-05-21
Also published as: JPH09310978A

Description

【０００１】
【発明の属する技術分野】
本発明はゴミの乾燥に用いられる回転胴型乾燥機に関するもので、特に回転胴の内面へのゴミの付着増長を防ぐとともに、ゴミの投入側から排出側への流れを阻害せず、滞留量が減少して処理能力が低下することのない回転胴内面のゴミの付着防止構造に係るものである。
【０００２】
【発明の背景】
都市において排出される家庭ゴミ、産業廃棄物等のゴミは、大部分が埋め立てあるいは焼却処分されていたのであるが、近時このものを乾燥させて例えば固形燃料としてＲＤＦ発電等に再利用することが行われている。そしてこのような目的に使用される装置のゴミ乾燥機としてドラム型乾燥機が従来からあり、更にこのドラム型乾燥機には回転ドラムタイプと非回転ドラムタイプがある。このうち回転ドラムタイプの回転胴型乾燥機は、回転自在に横設された円筒状の回転胴に両開口部を貫いて回転軸が具えられ、更にこの回転軸に羽根板を設けて成る。また回転胴２′の内面には、図８（ａ）に示すような断面が垂直棒状のリフタ１２′が設けられており、ゴミＡ′がより攪拌分散されるように構成されている。
そしてこの回転胴型乾燥機は、破砕されたゴミＡ′が回転胴２′内に投入され、羽根板２１′により攪拌しながら回転胴２′内に供給される熱風により乾燥するものであるが、従来より塩化ビニール等のプラスチック等が熱風により回転胴２′内において溶融し、図８（ａ）の斜線部に示すように回転胴２′の内壁に溶着しこれが成長するためこの除去を必要とするという問題点があった。
【０００３】
そこで、このような回転胴２′内面へのゴミＡ′の付着増長を阻止しようとする試みがなされているものであって、その技術思想を開示したものとして、特開平７−９１８３２号「乾燥機」がある。このものは回転胴２′のリフタ１２′を取り去り、攪拌羽根３′の羽根板２１′を図８（ｂ）のように乾燥機ドラム内壁底面に細隙を介して接近させ、付着したゴミＡ′を掻き取る構成を採っている。このような構成を採ると、羽根板２１′により付着したゴミＡ′が掻き取られ、確かに回転胴２′内面へのゴミＡ′の付着増長を防止することはできる。
【０００４】
しかしこのような手段を採った場合、回転胴２′内のゴミＡ′の投入側から排出側への流れが不安定になり、回転胴２′底部のゴミＡ′の滞留量（滞留ゴミＡ１′の量）が減少し、その結果装置の処理能力は低下してしまう。これは攪拌によりゴミＡ′が激しく吹き飛ばされてゴミＡ′の滞留するスペースが無くなってしまうことを大きな原因とする。
そこで羽根板２１′の取付ピッチを回転胴２′長手方向に広げ、本数を減らすことにより滞留量を確保する方法を取らざるを得ないが、この方法ではゴミＡ′の攪拌分散効果が減少し、処理能力の低下を免れ得なかった。
【０００５】
【開発を試みた技術的課題】
本発明はこのような背景からなされたものであって、回転胴の内面へのゴミの付着増長を防ぐとともに、ゴミの投入側から排出側への流れを阻害せず、滞留量が減少して処理能力が低下することのない回転胴内面のゴミの付着防止構造を有した新規な回転胴型乾燥機の開発を試みたものである。
【０００６】
【課題を解決するための手段】
すなわち請求項１記載の回転胴型乾燥機は、円筒状の回転自在な回転胴と、この回転胴内の長手方向に、回転胴の中心より下方且つ回転胴底部の滞留ゴミの回転移送方向側に位置されるように架け渡して設けられる回転軸及びこの回転軸に設けられる羽根板とを有する攪拌羽根と、を具備して成る乾燥機において、
前記回転胴の出口側には、回転胴の底面の滞留ゴミの量を調節するための円環状の出口堰が設けられ、
前記攪拌羽根における羽根板の先端部の位置は、前記回転胴の出口堰の２／３以上の高さ位置を通過し、且つこの出口堰における少なくとも回転胴底部の滞留ゴミの回転移送方向側においては出口堰の３／３以下の高さ位置を通過するように設定され、
一方前記回転胴の内面には、回転胴の底部に滞留するゴミの一部を持ち上げるリフタが回転胴の長手方向に複数本設けられ、このリフタは高さが前記出口堰の高さの１／３以下であり、且つ上部を尖端形とし回転方向側の前面とその反対側の後面とを、回転胴の内面に対して裾広がり状に傾斜させて接触させていることを特徴として成るものである。
この発明によれば、攪拌羽根が回転胴底部の滞留ゴミを掻き取る量が少ないため滞留ゴミはその量が多く、従ってゴミの排出側への移送の流れが安定する。また滞留ゴミの量が多いため、回転胴底部において回転により持ち上げられようとする滞留ゴミの崩れ落ちるような横滑りが起き、ゴミが回転胴内面に付着し増長することがない。
【０００７】
また前記回転軸は、回転胴の中心より下方且つ回転胴底部の滞留ゴミの回転移送方向側に位置されるため、掻き上げが必要な回転胴底部の回転移送方向側の滞留ゴミは確実に掻き上げ、回転胴上方を分散浮遊しているゴミなど攪散運動をしているゴミの運動を攪拌羽根がはたき落とすなどの運動の阻害が減少する。また回転軸を回転胴の中心に設ける場合に比べ羽根板を小さくでき、製造コストが安価にできるとともにランニングコストも安価になる。
【０００８】
更に前記回転胴の内面には、回転胴の底部に滞留するゴミの一部を持ち上げるリフタが回転胴の長手方向に複数本設けられ、このリフタは高さが出口堰の高さの１／３以下であり、且つ上部を尖端形とし回転方向側の前面とその反対側の後面を回転胴の内面に向かって裾広がり状に傾斜させたため、リフタにより滞留ゴミの一部が持ち上げられ攪拌分散が促進されるとともに、リフタの前面及び後面が裾広がり状に傾斜しているためゴミを滑らせやすく、特にリフタが回転胴の最下点付近に位置しているときにも滞留ゴミの横滑りを阻害することがない。またリフタの高さも滞留ゴミの量を決定する出口堰の高さの１／３以下と低いためリフタは滞留ゴミの横滑りを阻害しない。
【０００９】
更にまた請求項２記載の回転胴型乾燥機は、前記請求項１記載の要件に加え、前記リフタの傾斜角度は、回転胴の側方から見て回転胴の中心とリフタの上端を結ぶ延長線とリフタの前面とで挟まれる角が３０°以上６０°以下であり、回転胴の中心とリフタの上端を結ぶ延長線とリフタの後面とで挟まれる角が４５°以上９０°以下であることを特徴として成るものである。
この発明によれば、リフタの前面は回転胴の内面に対し比較的急な傾斜となるためリフタ効果を有するとともに、傾斜であるため滞留ゴミの横滑りを阻害しない。またリフタの後面は回転胴の内面に対し比較的緩やかな傾斜となるため、滞留ゴミが確実にここを横滑りし、この後面側にゴミが付着することがない。
【００１０】
【発明の実施の形態】
以下本発明の回転胴型乾燥機について図示の実施の形態に基づき説明する。図中符号１に示されるものが回転胴型乾燥機で、このものは回転自在に横設される円筒状の回転胴２と、この回転胴２内の長手方向に架け渡して回転自在に設けられる攪拌羽根３と、前記回転胴２の投入側と排出側とに設けられるその他の付設部材とを具備して成る。なお本明細書において回転胴型乾燥機１の方向を次のように定義する。すなわち滞留したゴミＡが回転移送される方向を前方とし（図１において手前側であって、図３においては右側）、その後側を後方とし（図１において奥側であって、図３においては左側）、ゴミＡの投入される側を右方（図１において右側）、ゴミＡの排出される側を左方とする（図１において左側）。
【００１１】
以下各部材について説明する。回転胴２は円筒状を成し、基台Ｂに対し支持ローラ１３によって回転自在に設けられている。回転胴２のゴミＡの投入側端部にはリング平板状の入口堰１０が設けられ、排出側端部にもリング平板状の出口堰１１が設けられる。なお図３に示されるように入口堰１０及び出口堰１１はともにゴミＡの流出を規制するものであるが、特に出口堰１１の高さは回転胴２内の底面の滞留ゴミＡ１の量を決定する。また回転胴２の内面には、アングル状のリフタ１２が一例として９０°の間隔で四本が設けられるものである。このリフタ１２は本発明の特徴の一つであり、高さが前記出口堰１１の高さの例えば２／７などの１／３以下に設定してあり、上部が尖端形として前面１２ａと後面１２ｂを回転胴２の内面に向かって裾広がり状に傾斜させている。なおリフタ１２の傾斜角度は、図３中の拡大図に示すように回転胴２の側方から見て回転胴２の中心とリフタ１２の上端を結ぶ延長線とリフタ１２の前面１２ａとで挟まれる角θ₁ が３０°以上６０°以下であることが好ましい。また回転胴２の中心とリフタ１２の上端を結ぶ延長線とリフタ１２の後面１２ｂとで挟まれる角θ₂ は４５°以上９０°以下に設定されることが好ましい。
【００１２】
次にこの回転胴２を駆動する構造について述べる。回転胴２の外面中央付近のやや投入側にはギヤが外周面上に設けられており、これに対しチェーン１４が巻回されて、このチェーン１４が下方の基台Ｂに設けられた駆動モータＭ１により駆動され、回転胴２が回転駆動されるように構成されている。
【００１３】
次に攪拌羽根３について説明する。攪拌羽根３は図３に示すように回転軸２０とこれにほぼ垂直に取り付けられる羽根板２１とから成る。回転軸２０は回転胴２内を長手方向に貫通し、後述する回転胴２の投入側と排出側に設けられる付設部材に対し軸受２２によって回転自在に設けられる。そしてこの回転軸２０の周面にほぼ垂直に羽根板２１が１２０°の間隔で放射状に設けられている。本発明の特徴として、前記回転軸２０の取付位置は側面から見て回転胴２の中心より下方であって、且つ滞留ゴミＡ１の移送側である前方側に設けられている。また羽根板２１の先端部２１ａの位置は、図３の羽根板２１の先端部２１ａの軌跡（図中一点鎖線）で示されるように出口堰の２／３以上の高さ位置を通過し、且つ回転胴２底部の滞留ゴミＡ１の回転移送方向側（回転胴２の手前側）においては前記出口堰１１の３／３以下の高さ位置を通過するように設定されている。従って結果的に従来の回転胴型乾燥機より回転胴２の底部の滞留ゴミＡ１の量は多くなる。
【００１４】
このような攪拌羽根３の駆動構造について述べると、図１に示されるように回転胴２の投入側の基台Ｂ上には駆動モータＭ２が設けられ、スプロケット２３とチェーン２４によってこの駆動モータＭ２の駆動が回転軸２０に伝達される。
【００１５】
次に付設部材について説明する。図１に示されるように回転胴２の投入側の基台Ｂには投入側機枠Ｆ１が固定して設けられ、前記攪拌羽根３の軸受２２や駆動中継伝達用のスプロケット２３及びゴミ投入機４が設けられる。更に投入側機枠Ｆ１には熱風吹込口５が設けられており、外部の熱風炉からの熱風がここに供給される。
また回転胴２の排出側の基台Ｂには排出側機枠Ｆ２が固定して設けられ、ここには排出シュート６が設けられる。排出シュート６の上部は排気口７としている。
【００１６】
本発明の回転胴型乾燥機１の実施の形態は以上のようにして成り、次のように作動する。まず概略的な説明をすると、回転胴２及び攪拌羽根３は、図４において時計反対方向に回転している。また熱風炉からの熱風が熱風吹込口５を通して回転胴２内に吹き込まれている。ゴミ投入機４より投入されたゴミＡは、乾燥されて排出シュート６から排出される。
【００１７】
更に攪拌乾燥態様について詳細に説明する。まず攪拌羽根３の作用を中心に説明すると、ゴミＡは攪拌羽根３により攪拌されて回転胴２内を浮遊するとともに回転胴２の底部に滞留して滞留ゴミＡ１となっている。この滞留ゴミＡ１は、従来の量に比べて多い。これは攪拌羽根３の羽根板２１の先端部２１ａが出口堰１１の２／３以上３／３以下の高さ位置を通過するように設定されているためである。従ってゴミＡの排出側への移送の流れが安定する。また滞留ゴミＡ１の量が多いため、回転胴２底部において回転により持ち上げられようとする滞留ゴミＡ１の崩れ落ちるような横滑りが起き、ゴミＡが回転胴２内面に付着し増長することがない。また羽根板２１は、回転胴２の中心より下方且つ回転胴２底部の滞留ゴミＡ１の回転移送方向側に位置されているため、こちら側の滞留ゴミＡ１のみを掻き上げ、他の横滑りを行っている滞留ゴミＡ１の運動を阻害しない。
【００１８】
次にリフタ１２の作用について説明すると、リフタ１２の前面１２ａは回転胴２の内面に向かって比較的急な傾斜であるため、リフタ１２により滞留ゴミＡ１の一部が持ち上げられ攪散が促進されるとともに、リフト終了後やリフタ１２が回転胴２の最下点付近に位置しているときにも従来のリフタ１２と異なり傾斜しているため滞留ゴミＡ１の横滑りを阻害しない。またリフタ１２の後面１２ｂは回転胴２の内面に向かって比較的緩やかな傾斜となるため、滞留ゴミＡ１が確実にここを横滑りし、この後面１２ｂ側にゴミＡが付着することがない。更にリフタ１２の高さも滞留ゴミＡ１の量を決定する出口堰１１の高さの１／３以下と低いため、リフタ１２は滞留ゴミＡ１の横滑りを阻害しない。
【００１９】
【他の実施の形態】
本発明は以上のものを基本的な実施の形態とするものであるが、次のような改変も行える。
【００２０】
すなわちリフタ１２の形状を図５（ａ）に示すように基本実施の形態のリフタ１２を変形して実施することも可能であるし、図５（ｂ）に示すようにθ₁ 及びθ₂ の角度を同一で形成することも可能である。
【００２１】
また図６に示すものはリフタ１２を八個設けた実施の形態を示すものである。すなわちリフタ１２は複数カ所設けるものであるが、具体的には回転胴２の大きさなどによって変わるものであって、リフトアクションにより滞留ゴミＡ１が横滑りを生じやすくなるようなピッチに複数（二〜八カ所程度）設けるものである。
【００２２】
また攪拌羽根３自体も種々の形態で実施し得るものであって、図７（ａ）に示すようにゴミＡの絡み付き等を防止するように回転軸２０に対し羽根板２１をゴミＡの排出側へ傾斜して取り付けるようにしてもよいし、図７（ｂ）に示すように先窄まり形状で実施することも可能である。
また羽根板２１の取付角度を図３などに示す基本実施の形態のように側方から見て１２０°の間隔で取り付けるほか、図７（ｃ）に示すように１８０°の間隔で取り付けたり、図７（ｄ）に示すように９０°の間隔で取り付けて実施することも可能である。
【００２３】
なお以上述べたすべての実施の形態における攪拌羽根３の実施の形態及びリフタ１２の実施の形態は、適宜の組み合わせで実施することが可能である。
【００２４】
【発明の効果】
請求項１記載の回転胴型乾燥機は、攪拌羽根３の回転軸２０は、回転胴２の中心より下方且つ回転胴２底部の滞留ゴミＡ１の回転移送方向側に位置され、羽根板２１の先端部２１ａの位置は、回転胴２終端側の出口堰１１の２／３以上の高さ位置を通過し、且つ少なくとも回転胴底部の滞留ゴミＡ１の回転移送方向側においては前記出口堰１１の３／３以下の高さ位置を通過するように設定され、一方、回転胴２の内面には、回転胴２の底部に滞留するゴミＡの一部を持ち上げるリフタ１２が回転胴２の長手方向に複数本設けられ、このリフタ１２は高さが出口堰１１の高さの１／３以下であり、且つ上部を尖端形とし回転方向側の前面１２ａと、その反対側の後面１２ｂとを回転胴２の内面に向かって裾広がり状に傾斜させている。
このため攪拌羽根３及びリフタ１２が回転胴２底部の滞留ゴミＡ１を掻き取る量が少なくなり滞留ゴミＡ１はその量が多くなる。従ってゴミＡの排出側への移送の流れが安定する。また滞留ゴミＡ１の量が多いため、回転胴２底部において回転により持ち上げられようとする滞留ゴミＡ１の崩れ落ちるような横滑りが起き、ゴミＡが回転胴２内面に付着し増長することがない。
【００２５】
また特に攪拌羽根３の回転軸２０は、回転胴２の中心より下方且つ回転胴２底部の滞留ゴミＡ１の回転移送方向側に位置されるため、掻き上げが必要な回転胴２底部の回転移送方向側の滞留ゴミＡ１は確実に掻き上げ、回転胴２上方を分散浮遊しているゴミＡなど攪散運動をしているゴミＡの運動を攪拌羽根３がはたき落とすなどの運動の阻害が減少する。また回転軸２０を回転胴２の中心に設ける場合に比べ羽根板２１を小さくでき、製造コストが安価にできるとともにランニングコストも安価になる。
【００２６】
更にリフタ１２の前面１２ａ及び後面１２ｂが裾広がり状に傾斜しているためゴミＡを滑らせやすく、特にリフタ１２が回転胴２の最下点付近に位置しているときにも滞留ゴミＡ１の横滑りを阻害することがない。またリフタ１２の高さも滞留ゴミＡ１の量を決定する出口堰１１の高さの１／３以下と低いためリフタ１２は滞留ゴミＡ１の横滑りを阻害しない。
【００２７】
更にまた請求項２記載の回転胴型乾燥機は、前記リフタ１２の傾斜角度は、回転胴２の側方から見て回転胴２の中心とリフタ１２の上端を結ぶ延長線とリフタ１２の前面１２ａとで挟まれる角が３０°以上６０°以下であり、回転胴２の中心とリフタ１２の上端を結ぶ延長線とリフタ１２の後面１２ｂとで挟まれる角が４５°以上９０°以下である。このためリフタ１２の前面１２ａは回転胴２の内面に対し比較的急な傾斜となるためリフタ１２効果を有するとともに、傾斜であるため滞留ゴミＡ１の横滑りを阻害しない。またリフタ１２の後面１２ｂは回転胴２の内面に対し比較的緩やかな傾斜となるため、滞留ゴミＡ１が確実にここを横滑りし、この後面１２ｂ側にゴミＡが付着することがない。
【図面の簡単な説明】
【図１】本発明の回転胴型乾燥機の実施の形態を示す正面図である。
【図２】同上左側面図及び右側面図である。
【図３】回転胴の横断面図及び羽根板の正面図である。
【図４】回転胴の作用状態を示す横断面図である。
【図５】リフタの形状の他の二種の実施の形態を示す横断面図である。
【図６】リフタの個数を変更した他の実施の形態を示す回転胴の横断面図である。
【図７】攪拌羽根の形状を異ならせた他の実施の形態を示す正面図、及び羽根板の取付個数を変更した他の三種の実施の形態を示す攪拌羽根の横断面図である。
【図８】従来の二種の回転胴型乾燥機の回転胴の横断面図である。
【符号の説明】
１回転胴型乾燥機
２回転胴
３攪拌羽根
４ゴミ投入機
５熱風吹込口
６排出シュート
７排気口
１０入口堰
１１出口堰
１２リフタ
１２ａ前面
１２ｂ後面
１３支持ローラ
１４チェーン
２０回転軸
２１羽根板
２１ａ先端部
２２軸受
２３スプロケット
２４チェーン
Ａゴミ
Ａ１滞留ゴミ
Ｂ基台
Ｆ１投入側機枠
Ｆ２排出側機枠
Ｍ１駆動モータ
Ｍ２駆動モータ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotary drum dryer used for drying garbage, and in particular, prevents the adhesion of dust to the inner surface of the rotary drum, and does not hinder the flow from the dust input side to the discharge side, and the retention amount This relates to a structure for preventing dust from adhering to the inner surface of the rotating drum so that the processing capacity does not decrease.
[0002]
BACKGROUND OF THE INVENTION
Most of household waste, industrial waste, and other waste discharged in the city was landfilled or incinerated. Recently, this waste is dried and reused as solid fuel for RDF power generation, for example. Has been done. As a dust dryer of an apparatus used for such a purpose, there has conventionally been a drum type dryer, and there are a rotary drum type and a non-rotational drum type as this drum type dryer. Among them, the rotary drum type rotary drum dryer includes a cylindrical rotary drum that is rotatably provided so as to pass through both openings, and further includes a blade plate on the rotary shaft. Further, a lifter 12 'having a vertical bar-like cross section as shown in FIG. 8 (a) is provided on the inner surface of the rotary drum 2' so that the dust A 'is further stirred and dispersed.
In this rotary drum type dryer, the crushed garbage A 'is put into the rotary drum 2' and dried by hot air supplied into the rotary drum 2 'while being stirred by the blade plate 21'. Conventionally, plastics such as vinyl chloride are melted in the rotating drum 2 'by hot air and welded to the inner wall of the rotating drum 2' as shown by the hatched portion in FIG. There was a problem that.
[0003]
Therefore, an attempt has been made to prevent such an increase in the adhesion of dust A 'to the inner surface of the rotary drum 2', and the technical idea thereof is disclosed as disclosed in JP-A-7-91832 "Drying. There is a machine. This removes the lifter 12 'of the rotating drum 2' and brings the blade plate 21 'of the stirring blade 3' closer to the bottom surface of the dryer drum inner wall as shown in FIG. It is configured to scrape ′. By adopting such a configuration, the dust A 'adhering to the blade plate 21' is scraped off, and it is possible to prevent the increase in the adhesion of the dust A 'to the inner surface of the rotating drum 2'.
[0004]
However, when such a means is adopted, the flow from the input side to the discharge side of the dust A ′ in the rotating drum 2 ′ becomes unstable, and the amount of dust A ′ staying at the bottom of the rotating drum 2 ′ (retaining dust A 1 The amount of ′) decreases, and as a result, the throughput of the device decreases. This is largely caused by the fact that the dust A 'is blown off violently by stirring and the space where the dust A' stays is lost.
Therefore, there is no choice but to increase the pitch of the blades 21 ′ in the longitudinal direction of the rotary drum 2 ′ and reduce the number of the blades 21 ′. In this method, the stirring and dispersing effect of the dust A ′ is reduced. , Could not escape the decline in processing capacity.
[0005]
[Technical issues for which development was attempted]
The present invention has been made from such a background, and while preventing the adhesion of dust to the inner surface of the rotating drum, it does not hinder the flow from the dust input side to the discharge side, and the retention amount is reduced. This is an attempt to develop a new rotary drum type dryer having a structure for preventing dust from adhering to the inner surface of the rotary drum without lowering the processing capacity.
[0006]
[Means for Solving the Problems]
That is, the rotary drum dryer according to claim 1 is a cylindrical rotary drum and a longitudinal direction in the rotary drum, which is below the center of the rotary drum and in the rotational transfer direction side of the accumulated dust at the bottom of the rotary drum. in the dryer constructed by comprising: a stirring blade, a and a blade plate provided on the rotary shaft and the rotary shaft are provided bridging to be positioned in,
On the outlet side of the rotating drum, an annular outlet weir for adjusting the amount of accumulated dust on the bottom surface of the rotating drum is provided,
Position of the distal end portion of the blade plate in the stirring blade is passed through more than two-thirds of the height of the outlet weir of the rotary drum, and in rotary transfer direction side of the residence garbage least the rotary shell bottom in the outlet weir Is set to pass through a height of 3/3 or less of the exit weir ,
On the other hand, on the inner surface of the rotary drum, a plurality of lifters are provided in the longitudinal direction of the rotary drum to lift a part of the dust staying at the bottom of the rotary drum, and the height of the lifter is 1 / of the height of the outlet weir. 3 or less, and the upper part is pointed, and the front surface on the rotational direction side and the rear surface on the opposite side are in contact with the inner surface of the rotating drum so as to incline toward the bottom. is there.
According to the present invention, since the amount of the stirrer scraping off the accumulated dust at the bottom of the rotating drum is small, the amount of accumulated dust is large, and the flow of the dust to the discharge side is stabilized. In addition, since the amount of staying dust is large, a side slip that collapses the staying dust that is about to be lifted by rotation at the bottom of the rotating drum occurs, and dust does not adhere to the inner surface of the rotating drum and increase.
[0007]
The rotating shaft is also because it is located in the rotary transfer direction side of the residence debris downward and rotary shell bottom from the center of the rotating drum, the residence dust rotary transfer direction of scraping up the rotary shell bottom necessary reliably scraped As a result, the hindrance of the stirrer blades, such as the dust that is moving up and scattering, such as the dust floating above the rotating drum, is reduced. Further, compared to the case where the rotation shaft is provided at the center of the rotating drum, the blade plate can be made smaller, the manufacturing cost can be reduced, and the running cost can be reduced.
[0008]
Further, on the inner surface of the rotating drum, a plurality of lifters are provided in the longitudinal direction of the rotating drum for lifting a part of the dust staying at the bottom of the rotating drum, and the height of the lifter is 1/3 of the height of the exit weir. The upper part is pointed and the front surface on the rotation direction side and the rear surface on the opposite side are inclined toward the inner surface of the rotating drum so that it spreads toward the bottom. In addition, the front and rear surfaces of the lifter are inclined so that the bottom of the lifter is widened, making it easier to slide the dust, especially when the lifter is located near the lowest point of the rotating drum. There is no hindrance. Further, since the height of the lifter is as low as 1/3 or less of the height of the exit weir that determines the amount of accumulated dust, the lifter does not hinder the side slip of accumulated dust.
[0009]
Further, in the rotary drum type dryer according to claim 2 , in addition to the requirement of claim 1 , the inclination angle of the lifter is an extension connecting the center of the rotary drum and the upper end of the lifter when viewed from the side of the rotary drum. The angle between the line and the front surface of the lifter is 30 ° or more and 60 ° or less, and the angle between the extension line connecting the center of the rotating drum and the upper end of the lifter and the rear surface of the lifter is 45 ° or more and 90 ° or less. It is characterized by this.
According to the present invention, the front surface of the lifter has a relatively steep inclination with respect to the inner surface of the rotating drum, and thus has a lifter effect, and since it is inclined, it does not hinder the side slip of accumulated dust. In addition, since the rear surface of the lifter has a relatively gentle inclination with respect to the inner surface of the rotating drum, the accumulated dust is surely slid on the rear surface, and the dust does not adhere to the rear surface side.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The rotary drum type dryer of the present invention will be described below based on the illustrated embodiment. In the figure, the reference numeral 1 indicates a rotary drum type dryer, which is provided with a cylindrical rotary drum 2 that is rotatably disposed horizontally, and is provided so as to be able to rotate over the longitudinal direction in the rotary drum 2. The stirring blade 3 is provided, and other attachment members provided on the input side and the discharge side of the rotary drum 2 are provided. In this specification, the direction of the rotary drum dryer 1 is defined as follows. That is, the direction in which the staying garbage A is rotated and transported is the front (front side in FIG. 1 and the right side in FIG. 3), and the rear side is rear (the back side in FIG. 1 and in FIG. Left side), the side into which dust A is introduced is the right side (right side in FIG. 1), and the side from which dust A is discharged is the left side (left side in FIG. 1).
[0011]
Each member will be described below. The rotary drum 2 has a cylindrical shape and is provided so as to be rotatable with respect to the base B by a support roller 13. A ring flat plate-like inlet weir 10 is provided at the input side end of the dust A of the rotating drum 2, and a ring flat plate-shaped outlet weir 11 is also provided at the discharge side end. As shown in FIG. 3, both the inlet weir 10 and the outlet weir 11 regulate the outflow of the garbage A. In particular, the height of the outlet weir 11 is determined by the amount of the accumulated garbage A1 on the bottom surface in the rotary drum 2. decide. For example, four angled lifters 12 are provided on the inner surface of the rotary drum 2 at intervals of 90 °. The lifter 12 is one of the features of the present invention, the height is set to 1/3 or less of the height of the outlet weir 11, for example, 2/7, and the upper part is pointed and has a front surface 12a and a rear surface. 12b is inclined toward the inner surface of the rotary drum 2 so as to spread toward the bottom. The tilt angle of the lifter 12 is sandwiched between an extension line connecting the center of the rotary drum 2 and the upper end of the lifter 12 and the front surface 12a of the lifter 12 as seen from the side of the rotary drum 2, as shown in the enlarged view of FIG. The angle θ ₁ is preferably 30 ° or more and 60 ° or less. Further, the angle θ ₂ sandwiched between the extension line connecting the center of the rotating drum 2 and the upper end of the lifter 12 and the rear surface 12b of the lifter 12 is preferably set to 45 ° or more and 90 ° or less.
[0012]
Next, a structure for driving the rotating drum 2 will be described. A gear is provided on the outer peripheral surface slightly near the center of the outer surface of the rotary drum 2, and a chain 14 is wound around the gear, and the drive motor is provided on the base B below. Driven by M1, the rotary drum 2 is configured to be driven to rotate.
[0013]
Next, the stirring blade 3 will be described. As shown in FIG. 3, the stirring blade 3 is composed of a rotating shaft 20 and a blade plate 21 attached substantially perpendicularly thereto. The rotary shaft 20 penetrates the inside of the rotary drum 2 in the longitudinal direction, and is rotatably provided by bearings 22 with respect to attachment members provided on the input side and the discharge side of the rotary drum 2 described later. The blades 21 are provided radially at intervals of 120 ° substantially perpendicular to the peripheral surface of the rotary shaft 20. As a feature of the present invention , the mounting position of the rotary shaft 20 is provided below the center of the rotary drum 2 when viewed from the side, and on the front side which is a transfer side of the staying dust A1. The position of the tip 21a of the slat 21 passes through a height position of 2/3 or more of the outlet weir as shown by the locus of the tip 21a of the slat 21 in FIG. In addition, it is set so as to pass through a height position of 3/3 or less of the outlet weir 11 on the rotational transfer direction side (the front side of the rotary drum 2) of the accumulated dust A1 at the bottom of the rotary drum 2. Therefore, as a result, the amount of accumulated dust A1 at the bottom of the rotary drum 2 is larger than that of the conventional rotary drum dryer.
[0014]
The drive structure of the stirring blade 3 will be described. As shown in FIG. 1, a drive motor M2 is provided on the base B on the charging side of the rotary drum 2, and this drive motor M2 is provided by the sprocket 23 and the chain 24. Is transmitted to the rotary shaft 20.
[0015]
Next, the attachment member will be described. As shown in FIG. 1, a charging machine base F1 is fixedly provided on a loading base B of the rotary drum 2, and a bearing 22 of the stirring blade 3, a sprocket 23 for transmission relay transmission, and a dust charging machine. 4 is provided. Further, a hot air blow-in port 5 is provided in the charging side machine frame F1, and hot air from an external hot air furnace is supplied thereto.
Further, a discharge side machine frame F2 is fixedly provided on the base B on the discharge side of the rotary drum 2, and a discharge chute 6 is provided here. The upper part of the discharge chute 6 is an exhaust port 7.
[0016]
The embodiment of the rotary drum dryer 1 of the present invention is configured as described above and operates as follows. First, a general description will be given. The rotating drum 2 and the stirring blade 3 rotate in the counterclockwise direction in FIG. Hot air from the hot air furnace is blown into the rotary drum 2 through the hot air blowing port 5. The dust A input from the dust input device 4 is dried and discharged from the discharge chute 6.
[0017]
Further, the stirring and drying mode will be described in detail. First, the operation of the stirring blade 3 will be described. The dust A is agitated by the stirring blade 3 and floats in the rotating drum 2 and stays at the bottom of the rotating drum 2 to become a staying dust A1. This staying garbage A1 is larger than the conventional amount. This is because the tip 21 a of the blade plate 21 of the stirring blade 3 is set to pass through a height position of 2/3 or more and 3/3 or less of the outlet weir 11. Therefore, the flow of transfer of the garbage A to the discharge side is stabilized. Further, since the amount of staying dust A1 is large, a side slip that causes the staying dust A1 to be lifted by rotation at the bottom of the rotating drum 2 does not occur, and the dust A does not adhere to the inner surface of the rotating drum 2 and increase. Further, since the vane plate 21 is positioned below the center of the rotary drum 2 and on the rotational transfer direction side of the accumulated dust A1 at the bottom of the rotary drum 2, only the accumulated dust A1 on this side is scraped and other side slip is performed. It does not hinder the movement of the accumulated garbage A1.
[0018]
Next, the operation of the lifter 12 will be described. Since the front surface 12a of the lifter 12 has a relatively steep inclination toward the inner surface of the rotary drum 2, the lifter 12 lifts a part of the accumulated dust A1 and promotes the scattering. In addition, even after the lift is completed or when the lifter 12 is located near the lowest point of the rotary drum 2, the sideways slip of the staying dust A1 is not hindered because it is inclined unlike the conventional lifter 12. Further, since the rear surface 12b of the lifter 12 has a relatively gentle inclination toward the inner surface of the rotating drum 2, the staying dust A1 surely skids there and the dust A does not adhere to the rear surface 12b side. Furthermore, since the height of the lifter 12 is as low as 1/3 or less of the height of the outlet weir 11 that determines the amount of the accumulated dust A1, the lifter 12 does not hinder the side slip of the accumulated dust A1.
[0019]
[Other embodiments]
The present invention has the above-described basic embodiment, but the following modifications can be made.
[0020]
That is, the shape of the lifter 12 can be implemented by modifying the lifter 12 of the basic embodiment as shown in FIG. 5 ( a ), and θ ₁ and θ ₂ as shown in FIG. 5 ( b ). It is also possible to form the same angle.
[0021]
FIG. 6 shows an embodiment in which eight lifters 12 are provided. That is, the lifters 12 are provided at a plurality of locations, and specifically, the lifters 12 vary depending on the size of the rotary drum 2 and the like. 8 places).
[0022]
Further, the stirring blade 3 itself can be implemented in various forms, and as shown in FIG. 7A, the blade plate 21 is discharged from the rotating shaft 20 so as to prevent the dust A from being entangled. It may be attached to be inclined to the side, or can be implemented in a tapered shape as shown in FIG.
In addition to mounting the blades 21 at 120 ° intervals as seen from the side as in the basic embodiment shown in FIG. 3 and the like, as shown in FIG. As shown in FIG. 7 (d), it is also possible to carry out mounting at intervals of 90 °.
[0023]
Embodiments and embodiment of the lifter 12 of the agitating blades 3 Note in the above-mentioned all embodiments may be implemented in appropriate combination.
[0024]
【The invention's effect】
In the rotary drum type dryer according to claim 1, the rotary shaft 20 of the stirring blade 3 is positioned below the center of the rotary drum 2 and on the rotational transfer direction side of the accumulated dust A1 at the bottom of the rotary drum 2 . The position of the tip 21a passes through a height position of 2/3 or more of the exit weir 11 on the end side of the rotary drum 2, and at least on the rotational transfer direction side of the accumulated dust A1 at the bottom of the rotary drum, 3/3 is set to pass the following height position, hand, on the inner surface of the rotating drum 2, the lifter 12 to lift a portion of the waste a, which collected in the bottom of the rotary drum 2 is a longitudinal rotary drum 2 direction is provided a plurality of, the lifter 12 has the height is 1/3 of the height of the outlet weir 11, and the front 12a of the rotational direction by the upper and pointed shape, and a surface 12b after the opposite It is inclined toward the inner surface of the rotating drum 2 so as to spread toward the bottom.
For this reason, the amount by which the stirring blade 3 and the lifter 12 scrape off the accumulated dust A1 at the bottom of the rotary drum 2 is reduced, and the amount of the retained dust A1 is increased. Therefore, the flow of transfer of the garbage A to the discharge side is stabilized. Further, since the amount of staying dust A1 is large, a side slip that causes the staying dust A1 to be lifted by rotation at the bottom of the rotating drum 2 does not occur, and the dust A does not adhere to the inner surface of the rotating drum 2 and increase.
[0025]
In particular, the rotating shaft 20 of the stirring blade 3 is positioned below the center of the rotating drum 2 and on the rotating transfer direction side of the accumulated dust A1 at the bottom of the rotating drum 2, so that the rotating transfer of the bottom of the rotating drum 2 that requires scraping is required. Residual waste A1 on the direction side is surely lifted up, and movement impediments such as the stirring blade 3 knocking off the movement of the dust A that is in a scattering motion such as the dust A dispersed and floating above the rotating drum 2 is reduced. To do. Further, compared to the case where the rotary shaft 20 is provided at the center of the rotary drum 2, the blade plate 21 can be made smaller, the manufacturing cost can be reduced, and the running cost can be reduced.
[0026]
Further, since the front surface 12a and the rear surface 12b of the lifter 12 are inclined so as to spread out, the dust A can easily slide. Especially when the lifter 12 is located near the lowest point of the rotary drum 2, the accumulated dust A1 Does not inhibit skidding. Further, since the height of the lifter 12 is as low as 1/3 or less of the height of the exit weir 11 that determines the amount of the accumulated dust A1, the lifter 12 does not hinder the side slip of the accumulated dust A1.
[0027]
Furthermore, in the rotary drum type dryer according to claim 2, the inclination angle of the lifter 12 is such that an extension line connecting the center of the rotary drum 2 and the upper end of the lifter 12 as viewed from the side of the rotary drum 2 and the front surface of the lifter 12. The angle between 12a and 30a is 60 ° or less, and the angle between the extension line connecting the center of the rotary drum 2 and the upper end of the lifter 12 and the rear surface 12b of the lifter 12 is 45 ° or more and 90 ° or less. . For this reason, the front surface 12a of the lifter 12 has a relatively steep inclination with respect to the inner surface of the rotating drum 2, so that it has the lifter 12 effect and does not hinder the side slip of the accumulated dust A1 because of the inclination. Further, since the rear surface 12b of the lifter 12 has a relatively gentle inclination with respect to the inner surface of the rotary drum 2, the staying dust A1 surely skids there and the dust A does not adhere to the rear surface 12b side.
[Brief description of the drawings]
FIG. 1 is a front view showing an embodiment of a rotary drum dryer according to the present invention.
FIG. 2 is a left side view and a right side view of the same.
FIG. 3 is a cross-sectional view of a rotating drum and a front view of a blade.
FIG. 4 is a cross-sectional view showing the operating state of the rotating drum.
FIG. 5 is a cross-sectional view showing two other embodiments of the shape of the lifter.
FIG. 6 is a cross-sectional view of a rotating drum showing another embodiment in which the number of lifters is changed.
FIG. 7 is a front view showing another embodiment in which the shape of the stirring blade is changed, and a cross-sectional view of the stirring blade showing three other embodiments in which the number of attached blade plates is changed.
FIG. 8 is a cross-sectional view of a rotary drum of two conventional rotary drum dryers.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rotating drum type dryer 2 Rotating drum 3 Stirring blade 4 Dust throwing machine 5 Hot air blowing port 6 Discharge chute 7 Exhaust port 10 Inlet weir 11 Outlet weir 12 Lifter 12a Front surface 12b Rear surface 13 Support roller 14 Chain 20 Rotating shaft 21 Blade plate 21a Tip 22 Bearing 23 Sprocket 24 Chain A Garbage A1 Residual Garbage B Base F1 Input Side Machine Frame F2 Discharge Side Machine Frame M1 Drive Motor M2 Drive Motor

Claims

Cylindrical rotatable rotating cylinder and a rotating shaft provided in a longitudinal direction in the rotating cylinder so as to be positioned below the center of the rotating cylinder and on the rotational transfer direction side of the accumulated dust at the bottom of the rotating cylinder. in and dryer formed by comprising: a stirring blade, a and a blade plate provided on the rotary shaft,
On the outlet side of the rotating drum, an annular outlet weir for adjusting the amount of accumulated dust on the bottom surface of the rotating drum is provided,
Position of the distal end portion of the blade plate in the stirring blade is passed through more than two-thirds of the height of the outlet weir of the rotary drum, and in rotary transfer direction side of the residence garbage least the rotary shell bottom in the outlet weir Is set to pass through a height position of 3/3 or less of the exit weir ,
On the other hand, on the inner surface of the rotating drum, a plurality of lifters are provided in the longitudinal direction of the rotating drum for lifting a part of the dust staying at the bottom of the rotating drum, and the height of the lifter is 1 / of the height of the outlet weir. 3 or less, and the upper surface is pointed and the front surface on the rotation direction side and the rear surface on the opposite side are brought into contact with the inner surface of the rotation cylinder so as to incline toward the bottom. Mold dryer.

The tilt angle of the lifter is such that the angle between the front surface of the lifter and the extension line connecting the center of the rotary drum and the upper end of the lifter when viewed from the side of the rotary drum is 30 ° or more and 60 ° or less. a rotary drum dryer of claim 1, wherein the angle sandwiched between the extension and the rear surface of the lifter connecting the upper end of the lifter is 45 ° to 90 °.