JP3562213B2 - Vertical crusher - Google Patents

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JP3562213B2
JP3562213B2 JP13653997A JP13653997A JP3562213B2 JP 3562213 B2 JP3562213 B2 JP 3562213B2 JP 13653997 A JP13653997 A JP 13653997A JP 13653997 A JP13653997 A JP 13653997A JP 3562213 B2 JP3562213 B2 JP 3562213B2
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crushing
separator
rotary
classifying
crusher
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JPH10323574A (en
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充 池田
泰文 中尾
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宇部興産株式会社
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【0001】
【発明の属する技術分野】
本発明は、回転テーブルと粉砕ローラとの協働により、セメント原料、石灰石、スラグ、クリンカやセラミック、化学品などの原料を粉砕し、粉砕産物を頂部に設けたセパレータで分級して、所望の粒度の粉末製品を得る竪型粉砕機に関するもので、特に、粉砕産物が分級作用を受ける前に、凝集した粉粒体を解砕する機能を付与した竪型粉砕機に関する。
【0002】
【従来の技術】
石灰石やセメント原料、スラグなどの原料を細かく粉砕し粉体とする粉砕機の1種として、図8に示すように、回転テーブルと粉砕ローラと回転式のセパレータを備えた竪型粉砕機1が広く用いられている。この種の粉砕機は、円筒状のケーシング15の下部において電動機2Bにより減速機2で駆動されて低速回転する円盤状の回転テーブル3Aと、その上面外周部を円周方向へ当分する箇所に油圧などで圧接されて従動回転する複数個の粉砕ローラ4とを備えるとともに、粉砕機の頂部には粉砕後の粉砕産物を分級する回転式のセパレータ13を備えている。
【0003】
粉砕ローラ4はケーシング15に軸6によって揺動自在に軸支されたアーム7を介して油圧シリンダ9のピストンロッド10に連結されており、油圧シリンダ9を作動させることにより、粉砕ローラ4を回転テーブル3A上に押圧して原料への粉砕圧力を与えている。3Sは回転テーブル3A外周縁に設けられた原料層厚を調整するダムリング、14は回転テーブル3A周囲のガス吹き上げ用環状空間通路、14Aはガス供給路、13は分級羽根13Aにより粉砕産物を分級する回転式セパレータ、16はガスとともに製品(分級後の精粉)を取り出す排出口、17は原料投入シュート、20は熱風ダクトである。
【0004】
このような竪型粉砕機において、回転テーブル3Aの中央部へ原料投入シュート17で供給された原料は、回転テーブル3Aの回転によりテーブル半径方向の遠心力を受けて回転テーブル3A上を滑る時に回転テーブル3Aの回転数よりいくらか遅い回転を行なう。以上2つの力、すなわち、半径方向の力と回転方向の力とが合成され、原料は回転テーブル3A上を渦巻状の軌跡を描いて回転テーブル3Aの外周部へ移動する。この外周部には、粉砕ローラ4が回転テーブル3A上に圧接されて回転しているので、渦巻線を描いた原料は原料は、粉砕ローラ4と回転テーブル3Aとの間へローラ軸方向とある角度をなす方向から進入して噛み込まれて粉砕される。
【0005】
一方、ケーシング15の基部には熱風ダクト20によって空気、あるいは熱風などのガスが導かれており、このガスが回転テーブル3Aの外周面とケーシング15の内周面との間の環状空間通路14から吹き上がることにより、粉砕された微粉体は回転テーブル3Aの外周端のダムリング3Sを乗り越え、ガスに同伴されてケーシング15内を上昇し、上部に位置するセパレータ13の分級羽根13Aにより分級作用を受け、所定粒度の製品はガスとともに排出口16から排出されて次の工程へ送られる。
【0006】
【発明が解決しようとする課題】
しかしながら、このような従来の竪型粉砕機においては、以下に述べるような技術上の問題があった。
回転テーブルと粉砕ローラと原料の粉砕を行なう粉砕部で生成した粉砕産物は、上昇気流に随伴してセパレータの運ばれ分級作用を受けるが、粉砕部で生成した粉砕産物の個々の微粒子は、単一の微粒子のままセパレータへ運ばれるものもあるが、大部分は、粉砕中に帯電した静電気により個々の微粒子がお互いに牽き付けあい凝集を起こして粗大粒子となったり、原料とともに竪型粉砕機内に持ち込まれる水分の影響により凝集を起こして大径の粒子の回りに小径の微粒子が付着した状態のものや同一の小径の微粒子が集合して一体化したままのものが、セパレータへ導入される。
この凝集現象は、所望の製品粒径が細かくなればなるほど顕著になり、近年、粉砕産物の粒度への要求度が高まって、それに伴って実施される超微粉砕領域の粉砕においては、既に要求粒度に達した微粒子が凝集現象によりミル内を循環してミル系より排出されないことが大きな問題となってきた。
【0007】
この場合には、この凝集した集合粒子群は、セパレータによる分級作用を受ける際には、見掛け上、大径の粒子として扱われ、セパレータを通過することなく粉砕部に戻される。
表1は、大気中の湿度の程度により分級結果が変化するテスト結果を示したものであり、数値は光透過法(湿式分散法)で測定した粒度分布を示す値と、風篩法で設定した分級径によって粒度を表示した値を示しており、風篩法では湿度の程度に応じて凝集の程度が大きくなって見掛けの粒径が粗大化している傾向がよく判る。すなわち、気流中では、湿式分散のときと異なり、微粒子同士が凝集を起こして見掛け上、粗大な粒子として分級され、かつ、湿度が高いほどこの傾向が強まることを示している。これと同様に、実際の装置でも、大気湿度により分級結果が大きく変わる。
【0008】
【表1】
【0009】
しかしながら、この凝集した集合粒子群を構成する個々の微粒子は、大部分が所望の製品粒度にまで粉砕された微粒子であり、本来、この竪型粉砕機の粉砕系より離脱して外部に排出されるべきものであり、このように集合粒子群がなかなか粉砕系より離脱し得ない場合には、下記の不都合を生じる。
【0010】
▲1▼ ミル内含塵量が増加し、ミル内圧力損失が大きくなり、吸引ファン動力の増大を招く。
▲2▼ セパレータへの粉粒体の繰り返し分級動作が増えるため、セパレータ動力が増大する。
▲3▼ 粉粒体のミル内循環量が増える結果、ミル動力(回転テーブル駆動動力)が増えるとともに、ミル粉砕能力が低下する。
▲4▼ 以上のことから、原料単位重量当たりの動力原単位が増加する。
以上の課題があるため、分級作用直前の粉砕産物の凝集を解消して、出来るだけ単一粒子の分級作用を出現する何らかの対応策が待望されていた。
【0012】
【課題を解決するための手段】
以上のような課題を解決するために、第1の発明では、回転テーブルの外周部上面に複数個の回転自在な粉砕ローラを配置し、回転テーブル中心部に供給した原料を粉砕ローラに所定の粉砕圧力を与えて回転テーブル上面と粉砕ローラ周面との間で粉砕し、頂部に粉砕産物を分級する回転式のセパレータを備えた竪型粉砕機において、該セパレータは、竪軸回りに回転するロータと該ロータの回転手段と該ロータの外周に等間隔に複数枚配設された分級羽根を備えるとともに、前記回転テーブルと該セパレータとの間に、竪軸回りに高速回転自在なロータの外周に等間隔で放射状に複数本の解砕棒を周設した解砕装置を備えた構成とした。
【0013】
また、第の発明では、第の発明の解砕装置の中心部を中空円筒体に形成するとともに、セパレータへ導入された粉砕産物のうちセパレータの分級羽根の分級作用により外方に撥ね飛ばされた粗粉粒子を集合して、該中空円筒体の中空部分を貫通して回転テーブルの中心部へ落下案内させる集合管をセパレータ外周に複数本配設した。
【0014】
【発明の実施の形態】
本発明においては、第1の参考例では、回転テーブルの外周部上面に複数個の回転自在な粉砕ローラを配置し、回転テーブル中心部に供給した原料を粉砕ローラに所定の粉砕圧力を与えて回転テーブル上面と粉砕ローラ周面との間で粉砕し、頂部に粉砕産物を分級する回転式のセパレータを備えた竪型粉砕機において、該セパレータは、竪軸回りに回転するロータと該ロータの回転手段と該ロータの外周に等間隔に複数枚配設された分級羽根を備えるとともに、該分級羽根の各々の外側に、下方の粉砕部より気体搬送によって該セパレータへ導入され分級作用を受ける粉砕産物のうち、凝集された粉粒体を解砕する解砕羽根を固設したため、凝集された粒子群は、分級作用を受ける直前に解砕羽根に衝突し、個々の微粒子にばらばらに分解された後に分級羽根に導入され、粉砕産物が正確に粗粉と精粉に分級されるから、凝集によるミル内循環が大幅に低減化される。
【0015】
また、第の発明では、回転テーブルの外周部上面に複数個の回転自在な粉砕ローラを配置し、回転テーブル中心部に供給した原料を粉砕ローラに所定の粉砕圧力を与えて回転テーブル上面と粉砕ローラ周面との間で粉砕し、頂部に粉砕産物を分級する回転式のセパレータを備えた竪型粉砕機において、該セパレータは、竪軸回りに回転するロータと該ロータの回転手段と該ロータの外周に等間隔に複数枚配設された分級羽根を備えるとともに、前記回転テーブルと該セパレータとの間に、竪軸回りに高速回転自在なロータの外周に等間隔で放射状に複数本の解砕棒を周設した解砕装置を備えた構成としたため、粉砕部よりセパレータへ向かう途中の含塵ガス中の凝集粒子群は、解砕装置の高速回転する解砕棒に衝突して、個々の微粒子にばらばらに分解された後に分級羽根に導入され、粉砕産物が正確に粗粉と精粉に分級されるから、凝集によるミル内循環が大幅に低減化される。
【0016】
さらに、第の発明では、第の発明の解砕装置の中心部を中空円筒体に形成するとともに、セパレータへ導入された粉砕産物のうちセパレータの分級羽根の分級作用により外方に撥ね飛ばされた粗粉粒子を集合して、該中空円筒体の中空部分を貫通して回転テーブルの中心部へ落下案内させる集合管をセパレータ外周に複数本配設したため、分級作用により選別されて再粉砕を必要とする粗粉が、解砕装置の回転中の解砕棒を通過することなく、回転テーブルに戻されて再粉砕されることになるから、上昇気流を乱すことがなくなるので、より安定したミル内ガス流れを形成し、連続安定運転が継続される。
【0017】
【実施例】
以下図面に基づいて本発明の実施例の詳細について説明する。図1〜図9は本発明の参考例と実施例に係り、図1は参考例による竪型粉砕機の全体縦断面図、図2〜図4はそれぞれ他の参考例を示すセパレータの要部概略縦断面図、図5は実施例による解砕装置の要部縦断面図、図6は図5の解砕装置の要部縦断面図、図7は他の実施例を示す解砕装置の側面図、図8は図7のA−A視の平面図、図9は図7の解砕装置の要部拡大縦断面図、図10はミル差圧およびミル電力原単位と粉砕量の相関に関する従来機と本発明に基づく参考例による改善機の比較図である。
【0018】
本発明に係る参考例として記載した竪型粉砕機1Aでは、図1に示すように、セパレータ13の分級羽根13Aの外側に集合微粒子を解砕する解砕羽根13Bを分級羽根13Aより分岐して配設する。分級羽根13Aは、一般に断面がL字形状に屈曲した、たとえば、不等辺山形鋼を使用するのに対して、解砕羽根13Aは分級が主目的でなく解砕羽根間を通過する含塵ガス上昇気流に解砕羽根13Bを回転して含塵ガス中の集合微粒子を衝突させて粉々に分離させる(解砕させる)ことが主目的であるから、平滑な平板を採用する。だだし、解砕羽根13Bの剛性を保つために分級羽根13Aと同様に不等辺山形鋼を使用してもよい。
【0019】
図2〜図4は、いずれも、解砕羽根13Bを有するセパレータ13の他の参考例を示したもので、図2の参考例では、セパレータ13のロータである下部コーン13aの円錐底面に沿わせた延長上に解砕羽根13Bを設けた。また、図3の参考例では、下部コーン13aの底面を水平にして解砕羽根13Bを水平に配置したものであり、図4の参考例では、従来機の分級羽根位置に解砕羽根13Bを配置し、分級羽根13Aはその内側に垂直に配置した。
【0020】
図5は、第の発明に相当する解砕装置50の実施例を示し、セパレータ13の解砕羽根13Bの代わりに、粉砕部とセパレータ13との間に、解砕装置50を設置したものである。解砕装置50の詳細構造は、図5や図6に示すように、ケーシング15の外側に配置した可変速電動機60の水平出力軸50eを減速機70を経由してミル内に導き、ギアボックス50b内のベベル歯車50c、50dの噛合により竪軸回りに変換してミル内で竪軸回りに高速回転する水平な解砕棒50aを配設したものであり、解砕棒50aは円柱または矩形断面平板で形成され、円周等間隔に放射状に複数本配設される。
【0021】
図5の解砕装置では、ミル中心部に解砕装置50のギアボックス50bは配置されるため、図1のようなミル軸芯下方に垂直に原料を投入するセンタ・フィード方式が採用できず、このため原料投入シュート17はケーシング15の側方寄り斜め下方に原料を供給するサイド・フィード方式を採用する。
【0022】
原料に性状や回転テーブル上への均等原料供給が望まれる場合には、センタ・フィード方式を採用するため、図7〜図9の他の実施例に係る解砕装置50A(第3の発明に相当する)を採用する。
この解砕装置50Aは、センタ・フィード方式が採用できるように、解砕装置50の軸芯部分が中空に形成されたもので、スタンド50fに固設された中空の円筒体50gの外周に軸受50hを介してガースギア(大歯車)50iを取り付け、図5の解砕装置50と同様に、ケーシング15の外側に配置した可変速電動機60の水平出力軸50eを減速機70を経由してミル内に導き、ギアボックス50b内のベベル歯車50c、50dの噛合により竪軸回りに変換してガースギア50iと噛合するピニオンギア(小歯車)50jを回転することによって、ミル内で竪軸回りに水平な解砕棒50aを高速回転するように構成した。
この場合には、円筒体50g内に原料投入シュート17を導くことが出来るから、センタ・フィードが可能である。
【0023】
また、図7や図8に示すように、セパレータ13の分級羽根13Aの外側に、分級羽根13Aによって進入を排除された分級点(分級粒径)以上の粗粉を集めて回転テーブル3Aの中心部に案内落下させる粗粉導管80を円周等間隔に2ないし6本程度配設する。粗粉導管80の分級羽根13Aの対向する部分は半割り状態のパイプとするか、または、図8に示すように、分級羽根13Aの回転方向を考慮して耳型形状とし、それ以下の部分は筒状に形成されたパイプを使用する。粗粉導管80の下端部は円筒体50gの側壁に接続され、セパレータ13で分級後の粗粉は解砕棒50aを横切ることなく回転テーブル中心部へ再粉砕のため戻されるから、ミル内の上昇気流を乱すことがなく、ミル内圧力損失の変化が少なく、振動の発生を最小限に抑えて、安定した連続運転が継続できる。
【0024】
図10は、本発明による参考例として解砕羽根13Aを設けたセパレータ13を有する竪型粉砕機のテスト機(回転テーブル径:360mm)で粉砕テストを実施した場合の、解砕羽根13Aを設けない従来テスト機との分級性能を比較したグラフであり、この結果によると、明らかに、凝集した集合微粒子の破壊後に分級する本発明の改善機は、従来機に比べて、ミル差圧、ミル電力原単位が向上し、かつ、その他のテスト結果においても、ミル差圧、ミル電力原単位のほかにも、表2に示すように、ミル能力が優れていることが判明した。
【0025】
【表2】
【0026】
以上説明したように、本発明の竪型粉砕機においては、解砕羽根13Bや解砕装置50、50Aの解砕棒50aの存在により、凝集した集合微粒子が、破壊され個々の微粒子がばらばらになって分級羽根13Aを通過する程度が大幅に増える結果、ミル圧力損失(ミル差圧)が減り、吸引ファン動力やミル駆動動力が低減できるとともに、ミル能力が増大し、ミル動力、吸引ファン動力、セパレータ動力を総合した総合動力原単位の大幅な低減が達成される。
【0027】
【発明の効果】
以上説明したように、本発明においては、下記のような優れた効果を発揮できる。
(1)極めて簡単な構造の解砕羽根や解砕棒の設置により、ミル差圧が低下して吸引ファン動力が低減され、かつ、ミル駆動動力が低減できる。
(2)所望粒度の精粉収率が向上する。
(3)ミル能力が向上するとともに、動力原単位の大幅な低減が達成される。
【図面の簡単な説明】
【図1】本発明の参考例に係る竪型粉砕機の全体縦断面図である。
【図2】本発明の参考例に係るセパレータの要部概略縦断面図である。
【図3】本発明の参考例に係るセパレータの要部概略縦断面図である。
【図4】本発明の参考例に係るセパレータの要部概略縦断面図である。
【図5】本発明の実施例に係る解砕装置の要部縦断面図である。
【図6】図5の解砕装置の要部縦断面図である。
【図7】本発明の他の実施例に係る解砕装置の側面図である。
【図8】図7のA−A視の平面図である。
【図9】図7の解砕装置の要部拡大縦断面図である。
【図10】ミル差圧およびミル電力原単位と粉砕量との相関に関する従来機と本発明に基づく改善機の比較図である。
【図11】従来の竪型粉砕機の縦断面図である。
【符号の説明】
1 竪型粉砕機(従来)
1A 竪型粉砕機(本発明)
2 減速機
2B 電動機(回転テーブル駆動用電動機)
3A 回転テーブル
3S ダムリング
4 粉砕ローラ
4a 回転軸
5 アーム
6 軸(回転軸)
7 アーム
13 セパレータ
13A 分級羽根
13B 解砕羽根
13a 下部コーン
14 環状空間通路
15 ケーシング
17 原料投入シュート
20 熱風ダクト
50 解砕装置
50a 解砕棒
50b ギアボックス
50c ベベルギア
50d ベベルギア
50e 出力軸
50f スタンド
50g 円筒体
50h 軸受
50i ガースギア
50j ピニオンギア
60 可変速電動機
70 減速機
80 粗粉導管
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention crushes raw materials such as cement raw materials, limestone, slag, clinker and ceramics, and chemicals by the cooperation of a rotary table and a crushing roller, classifies the crushed products with a separator provided on a top portion, and obtains a desired material. The present invention relates to a vertical pulverizer for obtaining a powder product having a particle size, and more particularly to a vertical pulverizer having a function of breaking up agglomerated powder before a pulverized product is subjected to a classification action.
[0002]
[Prior art]
As one type of a crusher that crushes raw materials such as limestone, cement raw materials, and slag into fine powders, as shown in FIG. 8, a vertical crusher 1 including a rotary table, a crushing roller, and a rotary separator is used. Widely used. This type of crusher includes a disk-shaped rotary table 3A that is driven by an electric motor 2B by a speed reducer 2 and rotates at a low speed at a lower portion of a cylindrical casing 15, and a hydraulic pressure is applied to a portion that divides an outer peripheral portion of an upper surface thereof in a circumferential direction. And a plurality of crushing rollers 4 that are driven and rotated by being pressed by the like, and a rotary separator 13 that classifies crushed products after crushing is provided at the top of the crusher.
[0003]
The crushing roller 4 is connected to a piston rod 10 of a hydraulic cylinder 9 via an arm 7 pivotally supported on a casing 15 by a shaft 6 so that the crushing roller 4 is rotated by operating the hydraulic cylinder 9. The material is pressed on the table 3A to give a pulverizing pressure to the raw material. 3S is a dam ring for adjusting the thickness of the raw material layer provided on the outer peripheral edge of the rotary table 3A, 14 is an annular space passage for blowing up gas around the rotary table 3A, 14A is a gas supply path, and 13 is a classifying blade 13A for classifying crushed products. Reference numeral 16 denotes an outlet for taking out a product (refined powder after classification) together with gas, reference numeral 17 denotes a raw material charging chute, and reference numeral 20 denotes a hot air duct.
[0004]
In such a vertical pulverizer, the raw material supplied to the center of the rotary table 3A by the raw material charging chute 17 receives centrifugal force in the radial direction of the table due to the rotation of the rotary table 3A and rotates when sliding on the rotary table 3A. The rotation is performed somewhat slower than the rotation speed of the table 3A. The above two forces, that is, the force in the radial direction and the force in the rotational direction are combined, and the raw material moves to the outer peripheral portion of the rotary table 3A along a spiral trajectory on the rotary table 3A. Since the crushing roller 4 is pressed on the rotary table 3A and rotated around the outer peripheral portion, the raw material depicting the spiral is in the roller axial direction between the crushing roller 4 and the rotary table 3A. It enters from an angled direction, is bitten, and is crushed.
[0005]
On the other hand, a gas such as air or hot air is guided to the base of the casing 15 by the hot air duct 20, and the gas flows from the annular space passage 14 between the outer peripheral surface of the rotary table 3 </ b> A and the inner peripheral surface of the casing 15. By being blown up, the pulverized fine powder gets over the dam ring 3S at the outer peripheral end of the rotary table 3A, rises in the casing 15 with the gas, and performs the classifying action by the classifying blades 13A of the separator 13 located above. The product having the predetermined particle size is discharged from the outlet 16 together with the gas and sent to the next step.
[0006]
[Problems to be solved by the invention]
However, such a conventional vertical pulverizer has technical problems as described below.
The pulverized product generated in the rotary table, the pulverizing roller, and the pulverizing unit for pulverizing the raw material is transported by the separator along with the ascending airflow and subjected to a classifying action. Some of the fine particles are transported to the separator as they are, but in most cases, the fine particles are attracted to each other by the static electricity charged during the pulverization to cause agglomeration and become coarse particles. Aggregation occurs due to the effect of moisture brought into the device, and particles with small particles adhered around large particles or those with the same small particles aggregated and integrated remain introduced into the separator. .
This agglomeration phenomenon becomes more remarkable as the desired product particle size becomes finer. In recent years, the degree of demand for the particle size of the crushed product has increased, and in the crushing of the ultra-fine crushing region that has been carried out in accordance therewith, the required phenomena are already required. It has become a major problem that the fine particles having reached the particle size are not circulated in the mill and discharged from the mill system due to the aggregation phenomenon.
[0007]
In this case, the aggregated aggregated particles are apparently treated as large-diameter particles when subjected to the classifying action by the separator, and are returned to the pulverizing section without passing through the separator.
Table 1 shows the test results in which the classification result changes depending on the degree of humidity in the atmosphere, and the numerical values are set to values indicating the particle size distribution measured by the light transmission method (wet dispersion method) and the wind sieving method. The value indicating the particle size is indicated by the classified diameter, and the air sieve method clearly shows that the degree of agglomeration increases according to the degree of humidity and the apparent particle size tends to be coarse. That is, it is shown that, unlike the case of the wet dispersion, the fine particles are aggregated with each other and apparently classified as coarse particles in the air stream, and this tendency is enhanced as the humidity becomes higher. Similarly, even in an actual apparatus, the classification result greatly changes depending on the atmospheric humidity.
[0008]
[Table 1]
[0009]
However, most of the individual fine particles constituting the aggregated aggregated particle group are fine particles crushed to a desired product particle size, and are originally separated from the crushing system of the vertical crusher and discharged to the outside. If the aggregated particles cannot be easily separated from the pulverization system, the following inconvenience occurs.
[0010]
(1) The dust content in the mill increases, the pressure loss in the mill increases, and the power of the suction fan increases.
{Circle around (2)} Since the operation of repeatedly classifying the powder and the granular material to the separator increases, the power of the separator increases.
{Circle around (3)} As a result of an increase in the amount of the powder and granules circulating in the mill, the mill power (rotary table driving power) increases, and the mill pulverizing ability decreases.
(4) From the above, the power consumption per unit weight of raw material increases.
Because of the above-described problems, there has been a long-awaited need for a countermeasure to eliminate the aggregation of the crushed product immediately before the classifying action and to achieve a single-particle classifying action as much as possible.
[0012]
[Means for Solving the Problems]
In order to solve the above problems, in the first invention, a plurality of rotatable crushing rollers are arranged on the upper surface of the outer peripheral portion of the rotary table, and the raw material supplied to the center of the rotary table is supplied to the crushing roller by a predetermined amount. In a vertical pulverizer provided with a rotary separator for applying a pulverizing pressure to pulverize between the upper surface of a rotary table and a peripheral surface of a pulverizing roller and classify pulverized products at the top, the separator rotates around a vertical axis. A rotor, rotating means for the rotor, and a plurality of classifying blades arranged at equal intervals on the outer periphery of the rotor; and an outer periphery of the rotor which is rotatable at high speed around a vertical axis between the rotary table and the separator. And a disintegrating device in which a plurality of disintegrating rods are provided radially at equal intervals.
[0013]
Further, in the second invention, the center of the crushing device of the first invention is formed in a hollow cylindrical body, and the crushed product introduced into the separator is repelled outward by the classifying action of the separator blade of the separator. A plurality of collecting pipes for collecting the coarse powder particles and guiding the falling through the hollow portion of the hollow cylindrical body to the center of the rotary table were arranged on the outer periphery of the separator.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
In the present invention, in the first reference example , a plurality of rotatable crushing rollers are arranged on the upper surface of the outer peripheral portion of the rotary table, and the raw material supplied to the center of the rotary table is given a predetermined crushing pressure to the crushing roller. In a vertical pulverizer provided with a rotary separator for pulverizing between a rotary table upper surface and a pulverizing roller peripheral surface and classifying a pulverized product at the top, the separator includes a rotor rotating around a vertical axis and a rotor of the rotor. A plurality of classifying blades are provided at equal intervals on the outer circumference of the rotor and the rotor, and pulverization is performed outside of each of the classifying blades into the separator by a gas carrier from a lower pulverizing unit and subjected to a classifying operation. Among the products, the crushing blades for crushing the agglomerated particles are fixed, so that the agglomerated particles collide with the crushing blades immediately before being subjected to the classification action, and are broken down into individual fine particles. It is introduced into the classifying blades in after, because pulverization product is classified exactly coarse and fine powder, milling the circulation is reduced considerably due to aggregation.
[0015]
Further, in the first invention, a plurality of rotatable crushing rollers are arranged on the upper surface of the outer peripheral portion of the rotary table, and the raw material supplied to the center of the rotary table is given a predetermined crushing pressure to the crushing roller, and the upper surface of the rotary table is rotated. In a vertical pulverizer provided with a rotary separator for pulverizing between a pulverizing roller peripheral surface and a pulverized product at the top, the separator comprises a rotor rotating about a vertical axis, a rotating means of the rotor, and A plurality of classifying blades are provided at equal intervals on the outer periphery of the rotor, and a plurality of classifying blades are radially arranged at equal intervals on the outer periphery of the rotor, which is rotatable at high speed around a vertical axis, between the rotary table and the separator. Because it was configured to have a crusher around the crushing rod, the aggregated particles in the dust-containing gas on the way from the crushing section to the separator collides with the crushing rod that rotates at high speed of the crusher, Individual particles It is introduced into the classifying blades after being decomposed into roses, because grinding product is classified exactly coarse and fine powder, milling the circulation is reduced considerably due to aggregation.
[0016]
Further, in the second invention, the central part of the crushing device of the first invention is formed in a hollow cylindrical body, and the crushed product introduced into the separator is repelled outward by the classification action of the classification wing of the separator. Collected coarse powder particles are collected, and a plurality of collecting pipes that penetrate through the hollow portion of the hollow cylindrical body and guide the fall to the center of the rotary table are arranged on the outer periphery of the separator. The coarse powder that needs to be returned to the rotary table and reground without passing through the rotating crushing rod of the crushing device does not disturb the updraft, so it is more stable A gas flow in the mill is formed, and continuous stable operation is continued.
[0017]
【Example】
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 to 9 relates to a reference example and embodiments of the present invention, FIG. 1 is a main portion of the separator showing an overall longitudinal sectional view, respectively, another reference example 2-4 of the vertical grinder according to Reference Example FIG. 5 is a schematic longitudinal sectional view of a crusher according to an embodiment , FIG. 6 is a longitudinal sectional view of an essential part of the crusher of FIG. 5, and FIG. 7 is a crusher of another embodiment. FIG. 8 is a plan view taken along the line AA of FIG. 7, FIG. 9 is an enlarged longitudinal sectional view of a main part of the crusher of FIG. 7, and FIG. FIG. 4 is a comparison diagram of a conventional machine and an improved machine according to a reference example based on the present invention.
[0018]
In the vertical pulverizer 1A described as a reference example according to the present invention , as shown in FIG. 1, a crushing blade 13B for crushing the aggregated fine particles outside the classification blade 13A of the separator 13 is branched from the classification blade 13A. Arrange. The classifying blade 13A generally uses a trapezoidal angle steel whose cross section is bent into an L-shape, for example, whereas the classifying blade 13A has a dust-containing gas that passes between the classifying blades not for the main purpose of classification. Since the main purpose is to rotate the crushing blade 13B against the rising airflow to collide the collected fine particles in the dust-containing gas to separate them into pieces (crush), a flat plate is adopted. However, in order to maintain the rigidity of the crushing blade 13B, an unequal angle iron may be used similarly to the classification blade 13A.
[0019]
2 to 4 show other reference examples of the separator 13 having the crushing blades 13B. In the reference example of FIG. A crushing blade 13B was provided on the extended portion. Further, in the reference example of FIG. 3, the crushing blades 13B are arranged horizontally with the bottom surface of the lower cone 13a being horizontal, and in the reference example of FIG. The classifying blades 13A were arranged vertically inside the classifying blades 13A.
[0020]
FIG. 5 shows an embodiment of a crushing device 50 corresponding to the first invention, in which the crushing device 50 is installed between the crushing section and the separator 13 instead of the crushing blade 13B of the separator 13. It is. As shown in FIGS. 5 and 6, the detailed structure of the crushing device 50 is as follows. The horizontal output shaft 50e of the variable speed motor 60 disposed outside the casing 15 is guided into the mill via the speed reducer 70, and The bevel gears 50c and 50d in the 50b are provided with a horizontal crushing rod 50a which is rotated around the vertical axis at a high speed in the mill after being converted around the vertical axis by meshing with the bevel gears 50c and 50d. It is formed of a flat plate in cross section, and a plurality of radially arranged at equal circumferential intervals.
[0021]
In the crusher of FIG. 5, the gear box 50b of the crusher 50 is disposed at the center of the mill, so that the center feed method in which the raw material is vertically supplied below the mill axis as shown in FIG. 1 cannot be adopted. For this reason, the material feeding chute 17 employs a side feed system for supplying the material obliquely downward to the side of the casing 15.
[0022]
When it is desired to supply the raw material with properties and a uniform raw material supply on the rotary table, a center feed method is adopted. Therefore, a crushing device 50A (according to the third invention) of another embodiment shown in FIGS. Equivalent) is adopted.
The crushing device 50A has a shaft portion formed in a hollow so that a center feed method can be adopted, and a bearing is provided on the outer periphery of a hollow cylindrical body 50g fixed to a stand 50f. A girth gear (gear gear) 50i is attached via a 50h, and a horizontal output shaft 50e of a variable speed electric motor 60 disposed outside the casing 15 is connected to the inside of the mill via a speed reducer 70, similarly to the crushing device 50 of FIG. By rotating the pinion gear (small gear) 50j meshing with the girth gear 50i by rotating the pinion gear (small gear) 50j meshing with the girth gear 50i by meshing the bevel gears 50c and 50d in the gear box 50b. The crushing rod 50a was configured to rotate at high speed.
In this case, since the raw material charging chute 17 can be guided into the cylindrical body 50g, center feeding is possible.
[0023]
As shown in FIGS. 7 and 8, coarse powder having a size equal to or higher than the classification point (classification particle size) whose entry is excluded by the classification blade 13A is collected outside the classification blade 13A of the separator 13 and the center of the rotary table 3A is rotated. Approximately two to six coarse powder conduits 80 to be guided and dropped into the section are arranged at equal circumferential intervals. The opposing portion of the classifying blade 13A of the coarse powder conduit 80 is a pipe in a half-split state, or as shown in FIG. Uses a pipe formed in a cylindrical shape. The lower end of the coarse powder conduit 80 is connected to the side wall of the cylindrical body 50g, and the coarse powder classified by the separator 13 is returned to the center of the rotary table for re-grinding without crossing the crushing rod 50a. The updraft is not disturbed, the change in pressure loss in the mill is small, the generation of vibration is minimized, and stable continuous operation can be continued.
[0024]
FIG. 10 shows a crushing blade 13A provided when a crushing test is performed by a vertical crusher test machine (rotary table diameter: 360 mm) having a separator 13 provided with a crushing blade 13A as a reference example according to the present invention. It is a graph comparing the classification performance with the conventional test machine, which shows that the improved machine of the present invention, which classifies after destruction of the aggregated aggregated fine particles, has a higher mill differential pressure, As shown in Table 2, it was found that the power consumption rate was improved, and the other test results showed that the mill capacity was excellent in addition to the mill differential pressure and the mill power consumption rate.
[0025]
[Table 2]
[0026]
As described above, in the vertical pulverizer of the present invention, the aggregated fine particles are destroyed by the presence of the crushing blades 13B and the crushing rods 50a of the crushing devices 50 and 50A, and the individual fine particles are separated. As a result, the degree of passing through the classifying blade 13A is greatly increased. As a result, the mill pressure loss (mill differential pressure) is reduced, the suction fan power and the mill drive power can be reduced, and the mill capacity is increased. As a result, a large reduction in the total power consumption per unit of separator power is achieved.
[0027]
【The invention's effect】
As described above, in the present invention, the following excellent effects can be exhibited.
(1) By installing a crushing blade or a crushing rod having an extremely simple structure, the differential pressure of the mill is reduced, the power of the suction fan is reduced, and the power of the mill drive can be reduced.
(2) The yield of refined powder having a desired particle size is improved.
(3) The mill capacity is improved, and the power consumption is significantly reduced.
[Brief description of the drawings]
FIG. 1 is an overall vertical sectional view of a vertical crusher according to a reference example of the present invention.
FIG. 2 is a schematic vertical sectional view of a main part of a separator according to a reference example of the present invention.
FIG. 3 is a schematic vertical sectional view of a main part of a separator according to a reference example of the present invention.
FIG. 4 is a schematic vertical sectional view of a main part of a separator according to a reference example of the present invention.
FIG. 5 is a longitudinal sectional view of a main part of the crushing apparatus according to the embodiment of the present invention.
FIG. 6 is a longitudinal sectional view of a main part of the crusher of FIG.
FIG. 7 is a side view of a crusher according to another embodiment of the present invention.
FIG. 8 is a plan view taken along the line AA of FIG. 7;
FIG. 9 is an enlarged longitudinal sectional view of a main part of the crushing apparatus of FIG.
FIG. 10 is a comparison diagram of a conventional machine and an improved machine based on the present invention with respect to the correlation between the mill differential pressure and the unit power of the mill and the grinding amount.
FIG. 11 is a longitudinal sectional view of a conventional vertical crusher.
[Explanation of symbols]
1 Vertical grinding machine (conventional)
1A Vertical mill (the present invention)
2 Speed reducer 2B motor (rotary table drive motor)
3A Rotary table 3S Dam ring 4 Crush roller 4a Rotary axis 5 Arm 6 axis (rotary axis)
7 Arm 13 Separator 13A Classification blade 13B Crushing blade 13a Lower cone 14 Annular space passage 15 Casing 17 Raw material charging chute 20 Hot air duct 50 Crushing device 50a Crushing bar 50b Gear box 50c Bevel gear 50d Bevel gear 50e Output shaft 50f Stand 50g Cylindrical body 50h Bearing 50i Girth gear 50j Pinion gear 60 Variable speed motor 70 Reduction gear 80 Coarse powder conduit

Claims (2)

  1. 回転テーブルの外周部上面に複数個の回転自在な粉砕ローラを配置し、回転テーブル中心部に供給した原料を粉砕ローラに所定の粉砕圧力を与えて回転テーブル上面と粉砕ローラ周面との間で粉砕し、頂部に粉砕産物を分級する回転式のセパレータを備えた竪型粉砕機において、該セパレータは、竪軸回りに回転するロータと該ロータの回転手段と該ロータの外周に等間隔に複数枚配設された分級羽根を備えるとともに、前記回転テーブルと該セパレータとの間に、竪軸回りに高速回転自在なロータの外周に等間隔で放射状に複数本の解砕棒を周設した解砕装置を備えたことを特徴とする竪型粉砕機。A plurality of rotatable crushing rollers are arranged on the upper surface of the outer periphery of the rotary table, and the raw material supplied to the center of the rotary table is applied with a predetermined crushing pressure to the crushing roller, and the raw material is supplied between the upper surface of the rotating table and the crushing roller peripheral surface. In a vertical pulverizer provided with a rotary separator for pulverizing and classifying a pulverized product at the top, a plurality of the separators are provided at regular intervals on a rotor rotating around a vertical axis, a rotating means of the rotor, and an outer periphery of the rotor. A solution comprising a plurality of classifying blades, and a plurality of crushing rods radiating at equal intervals around the outer periphery of a rotor that is rotatable at high speed around a vertical axis between the rotary table and the separator. A vertical crusher comprising a crusher.
  2. 解砕装置の中心部を中空円筒体に形成するとともに、セパレータへ導入された粉砕産物のうちセパレータの分級羽根の分級作用により外方に撥ね飛ばされた粗粉粒子を集合して、該中空円筒体の中空部分を貫通して回転テーブルの中心部へ落下案内させる集合管をセパレータ外周に複数本配設してなる請求項記載の竪型粉砕機。The central part of the crusher is formed in a hollow cylindrical body, and coarse powder particles, which are repelled outward by the classifying action of the classifying blades of the separator among the pulverized products introduced into the separator, are collected, and the hollow cylindrical body is formed. vertical crusher plurality of arranged and formed by claim 1, wherein the separator outer periphery of the hollow portion through collecting pipe for dropping guided to the center of the turntable body.
JP13653997A 1997-05-27 1997-05-27 Vertical crusher Expired - Lifetime JP3562213B2 (en)

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Application Number Priority Date Filing Date Title
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CN102909114A (en) * 2012-09-11 2013-02-06 新兴能源装备股份有限公司 Vertical type mineral powder dry mill
JP2017140573A (en) * 2016-02-09 2017-08-17 三菱日立パワーシステムズ株式会社 Classifier, pulverization and classification device, and pulverized coal burning boiler

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