JPH0275382A - Wind-force type classifier - Google Patents

Abstract

PURPOSE:To reduce power cost and to enhance classifying accuracy by providing a secondary dispersing cylinder, which has an inner diameter larger than the outer diameter of a dispersing disc and integrally rotates along with the dispersing disc, around the dispersing disc so as to suspend the same from the ceiling plate of said dispersing disc. CONSTITUTION:The raw material powder thrown in a classifier from a supply cylinder 13 falls on a rotating dispersing disc 6 and is thrown out from the peripheral edge of the dispersing disc 6 by centrifugal force to enter a secondary dispersing cylinder 17 and uniformly dispersed to the inner surface of said cylinder 17 to be dispersed in a membrane state from the lower end part thereof in an obliquely downward direction. A fine particulate component having a predetermined particle size rises through the revolving rising air stream from a lower door 3 to be guided to the space part between an outer cylinder 1 and an inner cylinder 2 by a main blade 11 and a fine powder is separated by centrifugal force to be discharged out of the machine as a product from a fine powder discharge port 15. The coarse powder not carried by the revolving rising air stream falls to be discharged out of the machine from the coarse powder discharge port 14 provided to the lower end of the inner cylinder 2. By this method, a powder having a predetermined particle size is obtained and the power base unit of the classifier can be lowered.

Description

【発明の詳細な説明】 〔産業上の利用分野］ 本発明は、微粉砕機で粉砕されたセメント原料またはセ
メントクリンカなどの粉末を、所定粒度以下の粒子と以
上の粒子とを分離する風力式分級機の分級効率の改善に
関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention is an air-powered method for separating powder such as cement raw materials or cement clinker that has been pulverized by a pulverizer into particles with a predetermined particle size or less and particles with a predetermined particle size or more. Regarding improving the classification efficiency of classifiers.

【従来の技術］ 従来゛よりセメント原料またはセメントタリンカ粉末な
どの分級に用いられている、スターチバンド型分級機を
例にとり従来技術を説明する。[Prior Art] The prior art will be explained by taking as an example a starch band classifier, which has been conventionally used for classifying cement raw materials or cement tarinka powder.

スターチバンド型分級機は縦断面概要図を第５図に、回
転軸の下端付近の縦断面拡大図を第６図に示す如く、上
部を密閉した円筒部の下部にコーン部を接続した外筒ｌ
と、外筒ｌと同軸に内設され、かつ上部を開放した円筒
部の下部に接続されたコーン部の中間部によろい戸３を
付設した内筒２と、外筒ｌの天井板５の中心部を回転自
在に貫通して垂下された回転軸４の下端に装着された円
形の分散盤６と、周縁に複数枚の選別羽根８を取付けて
回転する選別羽根取付盤９を分散盤６に支承する支承金
１１７と、選別羽根取付盤９上に立設される筒状あるい
は棒状の主羽根取付具ＩＯの先端に装着された主羽根１
１と、内筒２の上端に外筒１の壁を貫通して前進後退可
能なように設置されている複数枚の邪魔板よりなる風量
コントロールバルブ１２とにより構成されている。The starch band type classifier has an outer cylinder with a cylindrical part whose upper part is sealed and a cone part connected to the lower part, as shown in Fig. 5, which shows a schematic longitudinal cross-sectional view, and Fig. 6, which shows an enlarged longitudinal sectional view near the lower end of the rotating shaft. l
, an inner cylinder 2 with a shutter door 3 attached to the middle part of a cone part that is installed coaxially with the outer cylinder l and connected to the lower part of the cylindrical part with an open top, and a ceiling plate 5 of the outer cylinder l. The distribution plate 6 includes a circular dispersion plate 6 attached to the lower end of a rotary shaft 4 that freely passes through the center and hangs down, and a sorting blade mounting plate 9 that rotates with a plurality of sorting blades 8 attached to the periphery. and the main blade 1 attached to the tip of the cylindrical or rod-shaped main blade fixture IO installed upright on the sorting blade mounting board 9.
1, and an air volume control valve 12 consisting of a plurality of baffle plates installed at the upper end of the inner cylinder 2 so as to be able to move forward and backward through the wall of the outer cylinder 1.

分級機内の風の流れは１回転軸４の回転に伴う主羽根１
１の回転により、内筒２内に旋回上界流を外筒ｌ内に旋
回下降流を発生させ、これらをよろい戸３を介して循■
；させている。The flow of air inside the classifier is caused by the rotation of the main blade 1 due to the rotation of the shaft 4.
1 generates a swirling upper bound flow in the inner cylinder 2 and a swirling downward flow in the outer cylinder l, which are circulated through the shutter 3.
;I'm letting it happen.

図示しない粉砕機で粉砕された粉末は、分級機の天井板
５に開口部を有し、かつ回転軸４に沿って空間部を両段
するように川下されている供給筒１３に投入される。投
入された原料粉末は、第５図中の点線で示す如く供給筒
１３中を駆動装置Ｉ８により回転している分散盤６上に
落下し、遠心力により分散盤６上を移動して分散盤６の
周縁より水平に内筒方向に投げ出される。投げ出された
粉末は、よろい戸３を通って吹き上がってくる旋回上シ
フ流中に分散されて、粒径の大きい粗粉末は、気流中に
投げ出される際の遠心力と旋回流の遠心力により内筒に
達し重力により下方に落下する。Powder pulverized by a pulverizer (not shown) is fed into a supply cylinder 13 that has an opening in the ceiling plate 5 of the classifier and is downstreamed along the rotating shaft 4 so as to pass through the space in both stages. . As shown by the dotted line in FIG. 5, the charged raw material powder falls in the supply tube 13 onto the dispersion plate 6 which is being rotated by the drive device I8, moves on the dispersion plate 6 due to centrifugal force, and is transferred to the dispersion plate. 6 is thrown horizontally toward the inner cylinder. The thrown out powder is dispersed in the swirling Schiff flow that blows up through the shutter 3, and coarse powder with large particle size is dispersed by the centrifugal force when it is thrown into the airflow and the centrifugal force of the swirling flow. It reaches the inner cylinder and falls downward due to gravity.

中間粒径の粉末は、旋回上界流に乗って上方に移動する
速度が遅いため選別羽根８と衝突して内筒方向に投げ出
されて重力により下方に落下し、内筒２の下端に設けら
れている粗粉排出口１４より粗粉と共に機外に排出され
る。Powder with an intermediate particle size moves upward on the swirling upper bound flow at a slow speed, so it collides with the sorting blade 8, is thrown toward the inner cylinder, and falls downward due to gravity. The coarse powder is discharged from the machine together with the coarse powder from the coarse powder discharge port 14 provided therein.

選別羽根８を通り抜けた微粉末は、選別羽根８の上方に
取付けられている主羽根１１により旋回を与えられつつ
、外筒ｌと内筒２との間の空間に旋回下降流によって導
かれ、遠心力により分離され、外筒ｌの下端に設けられ
ている微粉排出口１５より機外に製品として排出される
。気流はよろい戸３を介して内筒２内に戻される。The fine powder that has passed through the sorting blade 8 is given a swirl by the main blade 11 attached above the sorting blade 8, and is guided into the space between the outer cylinder l and the inner cylinder 2 by a swirling downward flow. The powder is separated by centrifugal force and discharged as a product from the fine powder outlet 15 provided at the lower end of the outer cylinder l. The airflow is returned into the inner cylinder 2 via the shutter 3.

〔発明が解決しようとする課題］ 従来の装置では、第５図に示す如く分散盤と内筒の垂直
壁との間の狭い空間に原料粉末が分散されるため、この
空間の粉末濃度が高くなり粉末の分散が阻害されると共
に１回転軸の下端に装着された分散盤と選別羽根取付盤
とを連結する支承金具が複数個所取付けてあり、この支
承金具が第７図に示すように原料粉末の均一な分散を阻
害し、粉末の流れる部分と流れない部分とを作っていた
。[Problems to be Solved by the Invention] In the conventional device, the raw material powder is dispersed in a narrow space between the dispersion disk and the vertical wall of the inner cylinder as shown in Fig. 5, so the powder concentration in this space is high. In addition to inhibiting the dispersion of the powder, there are multiple supporting metal fittings that connect the dispersing disk attached to the lower end of the rotating shaft and the sorting blade mounting plate. This hinders the uniform dispersion of the powder, creating areas where the powder flows and areas where it does not.

従って上界気流中に分散される原料粉末は、上記の狭い
分散空間中で粉末濃度の濃い部分と薄い部分とができ、
粉末濃度の濃い部分は、通風抵抗が大きくなり気流が通
り難くなるため粉末の分散性がさらに悪くなり、分級さ
れるべき粒径以下の微粉末が粗粉末または微粉末と凝集
して旋回上界気流に乗れず、粗粉として分離される微粉
の迷い込み現象が起こり、その対策上必要以上の筒内風
速を用いる必要があった、従って、所定粒度の粉末を得
る方策として選別羽根による機械的な分級が必要となり
、分級機の電力原単位を上昇させる主要な要因となって
いた。Therefore, the raw material powder dispersed in the upper airflow has a part with a high powder concentration and a part with a low powder concentration in the narrow dispersion space.
In areas with a high powder concentration, the ventilation resistance increases and airflow becomes difficult to pass through, making the dispersibility of the powder worse, and fine powder with a particle size smaller than that to be classified aggregates with coarse powder or fine powder, resulting in a swirling upper limit. A phenomenon occurred in which fine powder could not be carried by the airflow and was separated as coarse powder, and as a countermeasure, it was necessary to use a cylinder air velocity higher than necessary. This required a large amount of classification, which was a major factor in increasing the power consumption of the classifier.

一方、粉末濃度の薄い部分は通風抵抗が小さいため気流
の通り抜は部分ができ、分級されるべき粒径以−Ｆの粗
粉末の一部が選別羽根を通り抜は微粉末と共に回収され
、いわゆる粗粉の迷い込み現象が起こり製品の品質に悪
影響を及ぼしていた。On the other hand, in areas where the powder concentration is low, ventilation resistance is small, so there is a section where the airflow passes through, and a part of the coarse powder with a particle size of -F to be classified passes through the sorting blade and is collected together with the fine powder. A so-called phenomenon of coarse powder getting trapped occurred, which had an adverse effect on the quality of the product.

製品の粉末度を変更する手段として次の２通りの技術が
ある。There are two techniques for changing the powderiness of a product.

ｌ）選別羽根の取付は枚数の増減、取付位置および羽根
幅の変更などを行い、粉末との衝突の頻度を変更する。l) When installing sorting blades, increase or decrease the number, change the installation position and blade width, etc. to change the frequency of collision with powder.

この手段は、粉末度を比較的大きく変更する際に用いら
れ、分級機を停止して人力により羽根を脱着しなければ
ならず人手と時間を要していた。This method is used when the powder degree is changed relatively significantly, and the classifier must be stopped and the blades must be attached and detached manually, which requires manpower and time.

２）コントロールバルブを機外より前進後退させ分級機
内の循環風量を調整する。2) Adjust the circulating air volume inside the classifier by moving the control valve forward and backward from outside the machine.

この手段は微調整に用いられ、運転中の粉末度の調整は
この手段で行っており１人力でコントロールバルブの侵
入度を調整しているため、多大な労力を要していた。This means is used for fine adjustment, and the fineness is adjusted by this means during operation, and the degree of penetration of the control valve is adjusted by one person, which requires a great deal of labor.

〔課題を解決するための手段１ 上記課題を解決して分級効率がよく、かつ操作性の良い
分級機を開発する目的で検討を行った結果、次に示す装
置を開発するに至った。[Means for Solving the Problems 1] As a result of studies aimed at solving the above problems and developing a classifier with high classification efficiency and good operability, the following device was developed.

分級機に投入された粉末の分散性を向上するため、粉末
の分級機構を次の構成とする。In order to improve the dispersibility of the powder fed into the classifier, the powder classification mechanism has the following configuration.

■　回転軸の下端に装着された分散板と選別羽根取付盤
とを連結する支承金具の影響を排除するため、供給筒よ
り分級機に投入された粉末が分散盤で１次分散されたの
ち衝突する位置に分散盤と一体に回転する２次分散筒円
筒を設けることにより２次分散させる機構を付設し、旋
回上界気流中に分散させる粉末の方向を、気流の上昇方
向に対して直角方向の分散（分散盤による水平方向の分
散）より、斜め下方向（円錐台形状）の分散として、幅
広い分散空間を形成させる。■ In order to eliminate the influence of the support fitting that connects the dispersion plate attached to the lower end of the rotating shaft and the sorting vane mounting board, the powder fed into the classifier from the supply tube is first dispersed by the dispersion plate and then collided with the dispersion plate. A secondary dispersion mechanism is provided by installing a secondary dispersion cylinder that rotates together with the dispersion plate at the position where the dispersion plate rotates, and the direction of the powder to be dispersed in the swirling upper airflow is perpendicular to the upward direction of the airflow. Rather than dispersion (horizontal dispersion by a dispersion plate), a wide dispersion space is formed by dispersion diagonally downward (in the shape of a truncated cone).

■　内筒への旋回上昇気流の取入口（よろい戸）を、２
次分散した粉末が内筒に到達する位置より下方に取り付
ける。■ The intake (shroud door) for the swirling updraft into the inner cylinder is
Next, install it below the position where the dispersed powder reaches the inner cylinder.

■　２次分散した粉末に旋回上界流が均一かつ直角に衝
突するよう１分級用気流の整流手段を設ける。(2) A rectifying means for the first classification air flow is provided so that the swirling upper bound flow collides with the secondary dispersed powder uniformly and at right angles.

以上のごとく構成した分級機の好ましい態様の１例とし
て、 （ａ）　　分級機に投入された粉末の分数機構を、回転
軸の下端に装着された分散機能を有する円形の分散盤と
、分散盤との間に空間部を画設するよう支承金具を介し
て連接された天井盤と、天井盤の周縁から分散盤より下
方まで垂下されている円筒形または円錐台形の環体とし
。As an example of a preferable embodiment of the classifier configured as described above, (a) the fractionating mechanism for the powder fed into the classifier is connected to a circular dispersion disk having a dispersion function attached to the lower end of the rotating shaft, and a dispersion disk A ceiling panel connected via a support fitting to define a space between the ceiling panel and the cylindrical or truncated conical ring body suspended from the periphery of the ceiling panel to below the distribution panel.

分散盤周縁と２次分散筒との間に円環状の開口部を形成
する。An annular opening is formed between the peripheral edge of the distribution disk and the secondary distribution cylinder.

円環状の開口部に斜め下向きの扮体排出用案内扱を設け
てもよい。A diagonally downward guide for discharging the costume body may be provided in the annular opening.

（ｂ）粉体の分散方向に延長した仮想線と内筒との交点
より下部に、内筒への旋回上昇気流の取入用のよろいｐ
を付設する。(b) An armor p is provided below the intersection of the imaginary line extending in the powder dispersion direction and the inner cylinder to take in the swirling upward airflow into the inner cylinder.
Attached.

（ｃ）２次分散粉末と旋回上昇流とが直角かつ均一に衝
突するように１円錐台形に架設された開度調節可能な複
数のガイドを有する整流装置を、分散盤と粉末の２次分
散層とよろい戸の上端を連ねる面により画設された空間
部に設ける。(c) A rectifying device having a plurality of guides installed in a truncated cone shape and having an adjustable opening so that the secondary dispersion powder and the swirling upward flow collide at right angles and uniformly is connected to the dispersion plate and the secondary dispersion of the powder. It is installed in the space defined by the surface that connects the upper end of the layer and the shutter.

［作用〕 供給筒を経由して、分散盤に到達した粉末は、分散盤の
回転に伴う遠心力により、分散盤の先端に向って移動し
空間に投げ出される。[Operation] The powder that has reached the dispersion plate via the supply tube is moved toward the tip of the dispersion plate and thrown out into space due to the centrifugal force accompanying the rotation of the dispersion plate.

空間に投げ出された粉末は、分散盤に支承金具を介して
連接された天井盤と分散盤との側方に設置されている２
次分散筒に達し、２次分散筒に衝突する際の反発力によ
り２次分散筒内面に均一に再分散されつつ下方に移動す
る。２次分散筒の下端に達した粉末は、２次分散筒の回
転運動と粉末粒子の重力により斜め下方への軌道を描い
て２次分散して落下する。The powder thrown out into the space is collected by a ceiling panel connected to the dispersion plate via a support metal fitting, and a two-way dispersion plate installed on the side of the dispersion plate.
When it reaches the secondary dispersion cylinder, it moves downward while being uniformly redispersed on the inner surface of the secondary dispersion cylinder due to the repulsive force when it collides with the secondary dispersion cylinder. The powder that has reached the lower end of the secondary dispersion cylinder follows a diagonally downward trajectory due to the rotational movement of the secondary dispersion cylinder and the gravity of the powder particles, and is secondarily dispersed and falls.

すなわち、分級機に投入された粉末は１円錐台形の軌道
を描き広い空間に均一な膜状の分散層を構成するため、
分散層を気流が通過する際に、分散の不均一に起因する
通過速度のアンバランスがなくなる。In other words, the powder fed into the classifier follows a truncated conical trajectory and forms a uniform film-like dispersed layer over a wide space.
When the airflow passes through the dispersion layer, there is no unbalance in the passing speed caused by non-uniform dispersion.

従って、通過速度のアンバランスに起因する粗粉への微
粉の迷い込みおよび微粉への粗粉の迷い込み現象を防止
できる。Therefore, it is possible to prevent the phenomenon of fine powder getting stuck into coarse powder and coarse powder getting stuck into fine powder due to unbalanced passing speed.

さらに、粉末が十分に分散しているので過大な風速を必
要とせず、分散層を通過する気流の通過速度を小さくす
ることができる。Furthermore, since the powder is sufficiently dispersed, an excessive wind speed is not required, and the speed of the airflow passing through the dispersion layer can be reduced.

また粉末の分散層が従来に比べて下方となるため、旋回
上昇気流による粉体の搬送距離が長くなり、旋回上昇気
流の遠心力の影響を受け、粉体中の粗粒分をさらに分離
することができる。従って１分級用の旋回上昇流の流速
を、製品として必要とする粉末粒子を搬送するに必要な
流速に制御すればよく、選別羽根による機械的な分級操
作を除くことが可能である。In addition, since the powder distribution layer is lower than before, the distance that the powder is transported by the swirling updraft becomes longer, and the coarse particles in the powder are further separated due to the influence of the centrifugal force of the swirling updraft. be able to. Therefore, it is only necessary to control the flow rate of the swirling upward flow for one classification to a flow rate necessary to convey the powder particles required as a product, and it is possible to eliminate the mechanical classification operation using the sorting blades.

また上昇気流を整流する整流装置をよろい戸と分散層と
の間に設置すれば、粉体に衝突する気流が均一化される
ため、前記作用をより一層高めることができる。Moreover, if a rectifying device for rectifying the rising air current is installed between the shutter and the dispersion layer, the air current colliding with the powder will be made uniform, so that the above-mentioned effect can be further enhanced.

なお、選別羽根に変えて、内筒内の上昇気流に旋回を与
えるため、天井盤の上面に旋回羽根を複数枚取付けても
よい。Note that instead of the sorting blades, a plurality of swirling blades may be attached to the upper surface of the ceiling panel in order to give swirling to the rising airflow in the inner cylinder.

分散盤の大きさおよびその周縁と２次分散筒との距離は
限定されるものではない。The size of the dispersion disk and the distance between its periphery and the secondary dispersion cylinder are not limited.

分散盤の周縁と２次分散筒の下端との間に開口している
開口部に、斜め下向きの粉体排出用案内板を設けること
は、粉末の分散性が向上するので好適である。It is preferable to provide a diagonally downward powder discharge guide plate in the opening between the peripheral edge of the dispersion disk and the lower end of the secondary dispersion cylinder, since this improves the dispersibility of the powder.

以上のごとき作用により粉末の分級を行うため、遠心力
により気流中に粉末を分散させて分級を行う何れの型式
の分級機に適用可能である。Since powder is classified by the above-mentioned action, it can be applied to any type of classifier that performs classification by dispersing powder in an air stream using centrifugal force.

なお、回転軸を回転させる駆動装置は１回転軸の回転数
を変更し得るものが好ましい。Note that the drive device for rotating the rotating shaft is preferably one that can change the number of rotations of the rotating shaft.

〔実施例］ 実施例１ 第１図は第５図に示した従来の分級機に本発明の改善を
加えた分級機の縦断面概要図、第２図は第１図における
垂直軸の下端付近の縦断面拡大図である。[Example] Example 1 Figure 1 is a schematic vertical cross-sectional view of a classifier that is the conventional classifier shown in Figure 5 with the improvements of the present invention, and Figure 2 is a diagram showing the vicinity of the lower end of the vertical axis in Figure 1. FIG.

上部を密閉した円筒部の下部にコーン部を接続した直径
５．５ｍの外筒ｌと、外筒ｌと同軸に内設され、かつ上
部を解放した円筒部の下部に接続したコーン部の中間部
によろい戸３を付設した直径４．３ｍの内筒２と、外筒
ｌの天井板５の中心部を貫通して垂下された回転軸４の
下端に装着された円形の分散盤６と、天井盤１９が回転
可能なように分散盤６に天井盤１９を支承する支承金具
７と、天井盤１９の周縁より垂下された長さ０．４ｍの
２次分散筒１７と、天井盤９より立ち上がった筒状の主
羽根取付金具ｌＯの先端に装着された主羽根１１と、外
筒ｌの天井板５に開口部を有し、かつ回転軸４周辺部に
空間部を画設するように垂下される供給筒１３とにより
構成されている。An outer cylinder 1 with a diameter of 5.5 m, which has a cone connected to the lower part of a cylindrical part whose upper part is sealed, and a cone part which is installed coaxially with the outer cylinder 1 and connected to the lower part of a cylindrical part with an open upper part. An inner cylinder 2 with a diameter of 4.3 m with a shutter 3 attached to the part thereof, and a circular dispersion plate 6 attached to the lower end of a rotating shaft 4 penetrating the center of the ceiling plate 5 of the outer cylinder l and hanging down. , a support fitting 7 that supports the ceiling panel 19 on the distribution panel 6 so that the ceiling panel 19 can rotate, a secondary distribution tube 17 with a length of 0.4 m hanging from the periphery of the ceiling panel 19, and the ceiling panel 9. The main blade 11 is attached to the tip of the cylindrical main blade mounting bracket lO that is more upright, and the ceiling plate 5 of the outer cylinder l has an opening, and a space is defined around the rotating shaft 4. The supply tube 13 is configured to be suspended from the feed tube 13.

図示していない原料ミルにおいて粉砕された原料粉末５
３０ｔ／ｈを供給筒１３より分級機内に投入する。投入
された原料粉末は、分級機内の回転軸４と空間を画設す
るように設置されている供給筒１３を経由して、回転軸
４の下端に装着された分散盤６上に落下する。分散盤６
は、回転軸４の上端に取付けられている１９０ｋＷの回
転速度変型可能な駆動装置１８により回転しており１分
散盤６上の原料粉末は、回転に伴う遠心力により分散盤
６上を移動し周縁より２次分散筒１７に向って投げ出さ
れる。２次分散筒１７に到達した原料粉末は、２次分散
筒１７の内面に均一に分散され、２次分散筒１７の下端
部より斜め下方向に薄膜状に分散され、所定粒径以下の
微粒分はよろい戸３を経由してくる旋回上昇気流中に同
伴されて上昇し、主羽根１１により外筒ｌと内筒２との
空間部に導かれ、遠心力により微粉末を分離して微粉排
出口１５より製品として機外に排出される。一方、旋回
上昇流に乗らなかった粗粉は、その重力により下方に落
下し、内筒２の下端に設けられている粗粉排出口１４よ
り機外に排出される。Raw material powder 5 pulverized in a raw material mill (not shown)
30 t/h is fed into the classifier from the supply cylinder 13. The charged raw material powder passes through a supply cylinder 13 installed so as to be spaced from the rotating shaft 4 in the classifier, and falls onto the dispersion plate 6 attached to the lower end of the rotating shaft 4. Dispersion board 6
is rotated by a drive device 18 that can change the rotational speed of 190 kW attached to the upper end of the rotating shaft 4, and the raw powder on the dispersing plate 6 is moved on the dispersing plate 6 by the centrifugal force accompanying the rotation. It is thrown toward the secondary dispersion cylinder 17 from the periphery. The raw material powder that has reached the secondary dispersion cylinder 17 is uniformly dispersed on the inner surface of the secondary dispersion cylinder 17, and is dispersed in a thin film diagonally downward from the lower end of the secondary dispersion cylinder 17, forming fine particles with a predetermined particle size or less. The powder is entrained in the swirling updraft that passes through the shutters 3, and is guided into the space between the outer cylinder 1 and the inner cylinder 2 by the main blade 11, where the fine powder is separated by centrifugal force and becomes a fine powder. The product is discharged from the machine through the discharge port 15 as a product. On the other hand, the coarse powder that did not ride on the swirling upward flow falls downward due to its gravity and is discharged from the machine through the coarse powder discharge port 14 provided at the lower end of the inner cylinder 2.

以上の分級機構を取付けた結果、分級機の動力原単位を
４０％程度削減でき、得られる製品中の４４μｍ周辺の
粒分が増加したため、ミル駆動電力原単位を２％程度削
減することができた６実施例２ 第３図は、実施例１に用いた風力式分級機の円環状の開
口部に、垂直方向に対して６０度の角度で粉体の案内板
２０を取付けた他の実施例の縦断面概要図で、他の条件
は実施例１と同様として操業した結果、実施例１に比し
、さらに分級機電力原単位の１％減の効果を得ることが
できた。As a result of installing the above classification mechanism, the power consumption of the classifier can be reduced by about 40%, and the amount of particles around 44 μm in the obtained product has increased, so the mill drive power consumption can be reduced by about 2%. Embodiment 2 Figure 3 shows another embodiment in which a powder guide plate 20 is attached to the annular opening of the wind classifier used in Embodiment 1 at an angle of 60 degrees with respect to the vertical direction. As shown in the longitudinal cross-sectional schematic diagram of the example, the operation was performed under the same conditions as in Example 1, and as a result, compared to Example 1, it was possible to further reduce the power consumption of the classifier by 1%.

実施例３ 第４図（ａ）は、実施例１に用いた風力式分級機に、よ
ろい戸と分散盤との間に、円錐台形に架設された開度調
節可能な複数のガイド板２２を有する整流装置２１を設
置したさらに他の実施例の要部斜視図である。ガイド板
２２は上下方向に複数段に分割されており、それぞれ第
４図（ｂ）に示すように操作ロッド２３をハンドル２４
で操作することによってガイド扱開閉リング２５、ロッ
ド２６により開度を調整することができる。Embodiment 3 FIG. 4(a) shows that the wind-powered classifier used in Embodiment 1 is equipped with a plurality of guide plates 22 installed in the shape of a truncated cone and whose opening degree can be adjusted between the shutters and the dispersion plate. FIG. 3 is a perspective view of a main part of still another embodiment in which a rectifying device 21 having a rectifying device 21 is installed. The guide plate 22 is divided into a plurality of stages in the vertical direction, and the operating rod 23 is connected to the handle 24 in each stage as shown in FIG. 4(b).
By operating the guide opening/closing ring 25 and the rod 26, the opening degree can be adjusted.

〔発明の効果］ 本発明を実施することにより５分級機内における粉末の
分散が良好となった結果、次のような優れた効果がある
ことが確認された。[Effects of the Invention] As a result of implementing the present invention, the dispersion of the powder in the 5-classifier became better, and as a result, it was confirmed that there were the following excellent effects.

（１）選別羽根が不要となり１分級機の動力費を削減で
きた。(1) No sorting blades are required, reducing power costs for the classifier.

（２）分級機内を循環させる、分級用気流の循環ファン
の吸引風量（主羽根の回転数）を削減できるので分級機
の動力費を削減できた。(2) The power cost of the classifier can be reduced because the suction air volume (rotation speed of the main blade) of the circulation fan for the classification air that circulates inside the classifier can be reduced.

（３）選別羽根が不要となり、製品の粉末度制御が回転
軸の回転数を変更（分級用気流の流速の変更）でよ（、
容易かつ遠隔操作で行えるので、作業量を削減すること
ができた。(3) Sorting blades are no longer required, and product fineness can be controlled by changing the rotation speed of the rotating shaft (changing the flow rate of the classification airflow).
Since it can be done easily and remotely, the amount of work can be reduced.

（４）分級精度が向上したので、製品への粗粒の迷い込
みが減少し、製品の品質を安定させることができるばか
りでな（、粗粉への微粉の迷い込みが無くなったため、
粉砕動力費を削減することができた。(4) Since the classification accuracy has been improved, the straying of coarse particles into the product is reduced, which not only makes it possible to stabilize the quality of the product.
It was possible to reduce the crushing power cost.

（５）分級機の構造を簡素化できるので製作費および据
付費を削減することができる。(5) Since the structure of the classifier can be simplified, manufacturing costs and installation costs can be reduced.

（６）分級機の構造を簡素化できるので保守点検費を削
減することができる。(6) Since the structure of the classifier can be simplified, maintenance and inspection costs can be reduced.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明の実施例の縦断面概要図、第２図は第１
図における垂直軸の下端付近の縦断面拡大図、第３図は
本発明の他の実施例の縦断面概要図、第４図（ａ）は本
発明のさらに他の実施例の要部斜視図、第４図（ｂ）は
その操作部説明図、第５図は従来の風力式分級機の縦断
面概要図、第６図は第５図における回転軸の下端付近の
縦断面拡大図、第７図は第６図におけるＡ−Ａ矢視断面
図である。 ■・−・外筒　　　　　　　２・・・内筒３・・・よろ
い戸　　　　　４−・・回転軸５・・・天井板　　　　
　　６・・・分散盤７−・・支承金具　　　　　８・・
・選別羽根９・・・選別羽根取付盤　　１０・・・主羽
根取付具１１・・・主羽根 １２・・・コントロールバルブ １３・−・供給筒　　　　　１４・・・粗粉排出口１５
−・・微粉排出口　　　１６・・−流出粉末１７・・・
２次分散筒　　　１８・・・駆動装置１９・−・天井盤
　　　　　２０・−・案内機２１・・・整流装置　　　
　２２・−・ガイド板２３・・・操作ロッド　　　２４
・・・ハンドル２５・・・ガイド板開閉リング ２６・・−ロットFIG. 1 is a longitudinal cross-sectional schematic diagram of an embodiment of the present invention, and FIG.
FIG. 3 is a schematic vertical cross-sectional view of another embodiment of the present invention, and FIG. 4(a) is a perspective view of essential parts of still another embodiment of the present invention. , Fig. 4(b) is an explanatory diagram of the operating part, Fig. 5 is a schematic longitudinal cross-sectional view of a conventional wind-powered classifier, Fig. 6 is an enlarged longitudinal cross-sectional view of the vicinity of the lower end of the rotating shaft in Fig. 5, 7 is a sectional view taken along the line A-A in FIG. 6. ■・・・Outer cylinder 2・・Inner cylinder 3・・Armor door 4・・・Rotating shaft 5・・Ceiling plate
6...Dispersion board 7-...Supporting metal fittings 8...
- Sorting blade 9... Sorting blade mounting board 10... Main blade fitting 11... Main blade 12... Control valve 13... Supply tube 14... Coarse powder discharge port 15
-...Fine powder outlet 16...-Outflow powder 17...
Secondary dispersion cylinder 18... Drive device 19... Ceiling panel 20... Guide machine 21... Rectifier
22...Guide plate 23...Operation rod 24
...Handle 25...Guide plate opening/closing ring 26...-Lot

Claims (1)

【特許請求の範囲】 １　分級機外筒の天井板の中心部を回転自在に貫通して
垂下された回転軸と、回転軸の下端に水平に装着された
円形の分散盤とを有し、分散盤上に供給された粉末を分
散盤の回転に伴う遠心力により、旋回上昇する気流中に
分散させる分級機において、 分散盤の外周に分散盤の外径より大きい内径を有し、分
散盤と一体に回転する２次分散筒を分散盤の天井盤から
垂下したことを特徴とする風力式分級装置。 ２　２次分散筒が、分散盤の天井盤の周縁から分散盤よ
り下方まで垂下されている円筒形または円錐台形をなし
、２次分散筒の下端と分散盤との間に円環状の開口部を
形成している請求項１記載の風力式分級装置。 ３　開口部周縁に落下方向案内板を付設した請求項２記
載の風力式分級装置。 ４　分散盤と分級用気流取入部との間に分級用気流整流
手段を設けた請求項１、２または３記載の風力分級装置
。[Scope of Claims] 1. A rotating shaft penetrating the center of the ceiling plate of the classifier outer cylinder so as to be rotatable and hanging down, and a circular dispersion plate mounted horizontally on the lower end of the rotating shaft, In a classifier that disperses the powder supplied onto the dispersion plate into a swirling and rising air stream by centrifugal force as the dispersion plate rotates, the dispersion plate has an inner diameter larger than the outer diameter of the dispersion plate on the outer periphery of the dispersion plate. A wind-powered classification device characterized by a secondary dispersion cylinder that rotates integrally with the dispersion plate hanging from the ceiling panel of the dispersion plate. 2. The secondary dispersion tube has a cylindrical or truncated conical shape that hangs down from the periphery of the ceiling panel of the distribution disk to below the distribution disk, and there is an annular opening between the lower end of the secondary distribution tube and the distribution disk. The wind-powered classification device according to claim 1, further comprising: 3. The wind-powered classification device according to claim 2, further comprising a falling direction guide plate attached to the periphery of the opening. 4. The wind classifier according to claim 1, 2 or 3, further comprising a classifying air flow rectifier provided between the dispersion plate and the classifying air flow intake section.