JP2003175343A - Apparatus and method for classification - Google Patents
Apparatus and method for classificationInfo
- Publication number
- JP2003175343A JP2003175343A JP2001377690A JP2001377690A JP2003175343A JP 2003175343 A JP2003175343 A JP 2003175343A JP 2001377690 A JP2001377690 A JP 2001377690A JP 2001377690 A JP2001377690 A JP 2001377690A JP 2003175343 A JP2003175343 A JP 2003175343A
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- Prior art keywords
- classification
- powder
- powder material
- classifying
- chamber
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は分級装置に関し、電
子写真、静電記録、静電印刷などにおける静電荷像を現
像するための乾式トナーの製造装置に関するものであっ
て、所望の粒径を得るために粒子の篩い分けを行う分級
装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a classifying apparatus, and more particularly to a dry toner manufacturing apparatus for developing an electrostatic image in electrophotography, electrostatic recording, electrostatic printing, etc. The present invention relates to a classifier for sieving particles in order to obtain them.
【０００２】[0002]
【従来の技術】従来、ミクロンオーダーの固体物質を粗
粉と微粉に分離させるための分級装置は、円筒形状の分
散室と分級室によって構成されている。分散室と分級室
との間には円錐状部材が設けられ、分散室の上部外側表
面一端の口から固体物質を供給し、当該分散室内部に形
成された旋回流によって分散作用を受け、さらに当該分
級室へと導かれ遠心分離によって、微粉排出口又は粗粉
排出口へと排出され、固体物質が粗粉と微粉に分離され
る。2. Description of the Related Art Conventionally, a classifying apparatus for separating a micron-order solid substance into coarse powder and fine powder is composed of a cylindrical dispersion chamber and a classification chamber. A conical member is provided between the dispersion chamber and the classification chamber, the solid substance is supplied from the mouth at one end of the upper outer surface of the dispersion chamber, and the solid substance is subjected to the dispersion action by the swirling flow formed in the dispersion chamber, It is guided to the classification chamber and discharged by centrifugal separation to the fine powder outlet or the coarse powder outlet, and the solid substance is separated into coarse powder and fine powder.
【０００３】図８は従来の分級装置の構成を示す断面図
である。同図に示す従来の分級装置は、１次搬送空気で
ある流入エアーと固体物質が供給される供給管１と、エ
アーと共に超微粉が排出される排気管２と、分散室３
と、当該分散室３に送り込まれる２次搬送空気であるエ
アー流入口４と、エアーと共に微粉が排出される微粉排
出口５と、エアーと共に粗粉を排出する粗粉排出口６
と、分散室３の下部に設けられ、分散室３内の旋回流場
を増長させる円錐状部材７と、その下部に設けられた分
級板８と、分散室３とを円錐状部材７で、そして分級板
８で区画される分級室９とを含んで構成されている。な
お、分級装置本体全体は略円筒状の筐体からなる。FIG. 8 is a sectional view showing the structure of a conventional classifying device. The conventional classifying apparatus shown in the same figure is provided with a supply pipe 1 to which an inflow air as a primary carrier air and a solid substance are supplied, an exhaust pipe 2 from which ultrafine powder is discharged together with the air, and a dispersion chamber 3
An air inlet 4 which is a secondary carrier air sent into the dispersion chamber 3, a fine powder discharge port 5 for discharging fine powder together with the air, and a coarse powder discharge port 6 for discharging coarse powder together with the air.
And a conical member 7 provided below the dispersion chamber 3 for increasing the swirl flow field in the dispersion chamber 3, a classification plate 8 provided below the conical member 7, and the dispersion chamber 3 with the conical member 7. And it is comprised including the classification chamber 9 divided by the classification plate 8. In addition, the whole classification apparatus main body consists of a substantially cylindrical housing.
【０００４】次に、図８に示す従来の分級装置の動作に
ついて説明する。先ず、供給管１及びエアー流入口４か
らエアーが供給され、同時に排気管２、微粉排出口５及
び粗粉排出口６からエアーが排出されることにより、分
散室３及び分級室９の各内部には旋回流場が形成され
る。そこに、供給管１より固体物質がエアーと共に供給
され、分散室３の内部に導かれ、エアーの旋回流場によ
る遠心分離作用を受けながら、固体物質は回転しながら
落下していく。この時、固体物質の中でも非常に小さい
粒径の超微粉は分散室３の中心方向に導かれ、吸引ファ
ン等による吸引器（図示せず）と連通する排気管２より
排出されることとなる。分散室３内で回転しながら落下
した固体物質は環状の間隙Ａを通過して分級室９に導か
れ、ここでも遠心分離作用を受けることにより、固体物
質の中でも大きい粗粉は遠心力によって分級室９の中心
から遠ざかり、分級板８と分級室９の各内壁面との環状
の間隙Ｂを通過して吸引ファン等による吸引器（図示せ
ず）と連通する粗粉排出口６より排出される。一方、微
粉は向心力によって分級室９の中心へと導かれ、吸引フ
ァン等による吸引器（図示せず）と連通する微粉排出口
５より排出される。Next, the operation of the conventional classification device shown in FIG. 8 will be described. First, air is supplied from the supply pipe 1 and the air inlet 4, and at the same time, air is discharged from the exhaust pipe 2, the fine powder discharge port 5 and the coarse powder discharge port 6, so that the inside of each of the dispersion chamber 3 and the classification chamber 9 is increased. A swirling flow field is formed in the. The solid substance is supplied to the inside of the dispersion chamber 3 through the supply pipe 1 and is introduced into the dispersion chamber 3. The solid substance is rotated and dropped while being subjected to the centrifugal separation action by the swirling flow field of the air. At this time, ultrafine powder having a very small particle diameter among the solid substances is guided toward the center of the dispersion chamber 3 and discharged from the exhaust pipe 2 communicating with a suction device (not shown) such as a suction fan. . The solid substance that has fallen while rotating in the dispersion chamber 3 is guided to the classification chamber 9 through the annular gap A, and is subjected to the centrifugal separation action here as well, so that coarse particles that are large among the solid substances are classified by the centrifugal force. It moves away from the center of the chamber 9, passes through the annular gap B between the classifying plate 8 and each inner wall surface of the classifying chamber 9, and is discharged from the coarse powder discharge port 6 communicating with a suction device (not shown) such as a suction fan. It On the other hand, the fine powder is guided to the center of the classification chamber 9 by the centripetal force, and is discharged from the fine powder discharge port 5 communicating with a suction device (not shown) such as a suction fan.
【０００５】このような構成の従来の分級装置における
分級室に流入される固体物質中に凝集物が混入すること
を防ぐ方法として、例えば特開平８−５７４２４号公報
（以下従来例と称す）では分級装置における分級室上部
外周囲に傾斜する複数の案内羽根を環状に配置し、隣接
する案内羽根間に二次空気流入路を設け、分散室内での
固体粒子の凝集を防止することで製品回収率を向上させ
ている。As a method for preventing the agglomerates from being mixed in the solid substance flowing into the classification chamber in the conventional classification device having such a structure, for example, in Japanese Patent Laid-Open No. 8-57424 (hereinafter referred to as a conventional example). A plurality of guide vanes inclined around the upper part of the classification chamber of the classifier are annularly arranged, and a secondary air inflow path is provided between adjacent guide vanes to prevent solid particles from agglomerating inside the dispersion chamber, thereby collecting products. Is improving the rate.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、上記従
来の分級装置によれば、分散室内での固体物質の凝集を
低減できるものの、従来例の分級装置のように分級室上
部外周囲に傾斜する複数の案内羽根を環状に配置し、隣
接する案内羽根間に二次空気流入路を設けることは比較
的容易ではなく、調整因子の増加、案内羽根への固体物
質の付着による切り替え作業時間の増加等の問題があ
る。更に、従来の分級装置の課題は大きく２つに分けら
れる。その一つの課題は分散室に供給された固体物質の
分散性の向上である。なぜなら、供給された固体物質の
一つ一つは速やかに分散室を通過し、分級室へと導かれ
分離作用を受けるのが理想的であるが、分散室内で旋回
しながら下降し分級室上部においても旋回し続けて滞留
し、固体物質の粒子が相互に関わりあって凝集物となる
場合があり、分級精度の低下を招いているからである。
もう一つの課題は分級室内での分級精度の向上である。
固体粒子は分散室から分級室へと導かれる、理想とする
分級とは、所望の粒径以上の固体物質が全て粗粉回収側
へ、所望の粒径以下の固体物質は微粉回収側に回収され
ることである。しかし、実際の分級装置においては、所
望の粒径以上の固体物質が微粉回収側へ、また所望の粒
径以下の固体物質が粗粉回収側へ回収されてしまうこと
がある。このような分級誤差があるのが現状である。よ
って、分級誤差の少ない、シャープな分布が得られる分
級装置が求められている。However, although the above-mentioned conventional classifying device can reduce the agglomeration of the solid substance in the dispersion chamber, a plurality of slanting members are inclined around the upper outside of the classifying chamber like the conventional classifying device. It is not relatively easy to arrange the guide vanes in a ring shape and to provide a secondary air inflow path between the adjacent guide vanes, increasing the adjustment factor, increasing the switching work time due to the adhesion of solid substances to the guide vanes, etc. I have a problem. Further, the problems of the conventional classifying device can be roughly divided into two. One of the problems is to improve the dispersibility of the solid substance supplied to the dispersion chamber. It is ideal that each of the supplied solid substances immediately passes through the dispersion chamber and is guided to the classification chamber where it undergoes the separation action, but it descends while swirling in the dispersion chamber and the upper part of the classification chamber. In this case, the particles continue to swirl and stay, and the particles of the solid substance may interact with each other to form an agglomerate, resulting in a decrease in classification accuracy.
Another issue is the improvement of classification accuracy in the classification room.
Solid particles are guided from the dispersion chamber to the classification chamber.Ideal classification means that all solid substances with a desired particle size or more are recovered to the coarse powder recovery side, and solid substances with a desired particle size or less are recovered to the fine powder recovery side. Is to be done. However, in an actual classification device, a solid substance having a desired particle size or more may be recovered to the fine powder recovery side, and a solid substance having a desired particle size or less may be recovered to the coarse powder recovery side. At present, there is such a classification error. Therefore, there is a demand for a classifying device with a small classification error and a sharp distribution.
【０００７】本発明はこれらの問題点を解決するための
ものであり、分級装置の分散室内での分散性の向上を容
易な設備変更で可能とし、分級装置の分級室内での分級
精度向上を達成し、必要とする大きさの範囲の粒子を高
効率で分離することができる分級装置を提供することを
目的とする。The present invention is intended to solve these problems, and makes it possible to improve the dispersibility of the classifier in the dispersion chamber by simply changing the equipment, thereby improving the classification accuracy of the classifier in the classification chamber. It is an object of the present invention to provide a classification device that can achieve and efficiently separate particles in a required size range.
【０００８】[0008]
【課題を解決するための手段】前記問題点を解決するた
めに、搬送空気と共に供給される粉体材料に旋回流を与
えて粉体材料を分散する分散室と、該分散室の下方に連
続して設けられて分散室から流入する粉体材料を微粉と
粗粉とに遠心分級する分級室と、分散室と分級室とを区
画する円錐状部材と、分級室を区画し、粉体材料を微粉
と粗粉に分級する分級板とを有し、分散室の上部に設け
られた粉体材料供給口から供給された粉体材料は分散室
内部に形成された旋回流によって旋回分散作用を受けて
超微粉を排出し、更に分級室へと導かれて遠心分離によ
って粉体材料を粗粉と微粉に分級する、本発明に係る分
級装置は、分散室内の上部旋回流を変化させ、粉体材料
の固体粒子の滞留を防止する滞留防止手段を設けたこと
に特徴がある。また、滞留防止手段は超微粉を排出する
排気管に所定の幅および高さを持つ滞留防止部材を設け
ることにより構成する。よって、分散室での粉体材料の
分散性及び分級室での分級精度を向上することができ
る。In order to solve the above-mentioned problems, a dispersion chamber for distributing a powder material by giving a swirl flow to the powder material supplied together with carrier air, and a dispersion chamber continuously below the dispersion chamber. And a classification chamber for centrifugally classifying the powder material flowing in from the dispersion chamber into fine powder and coarse powder, a conical member for partitioning the dispersion chamber and the classification chamber, and a classification chamber for partitioning the powder material Has a classifying plate for classifying into fine powder and coarse powder, and the powder material supplied from the powder material supply port provided in the upper part of the dispersion chamber has a swirling dispersion action by a swirling flow formed inside the dispersion chamber. The superfine powder is received and discharged, and further guided to the classification chamber to classify the powder material into coarse powder and fine powder by centrifugation, the classification device according to the present invention changes the upper swirl flow in the dispersion chamber, and the powder It is characterized in that a retention preventing means for preventing retention of solid particles of the body material is provided. Further, the retention preventing means is constituted by providing a retention preventing member having a predetermined width and height in the exhaust pipe for discharging the ultrafine powder. Therefore, the dispersibility of the powder material in the dispersion chamber and the classification accuracy in the classification chamber can be improved.
【０００９】更に、滞留防止部材を複数設けたことによ
り、分散室上部の固体物質の滞留を防止し、また、供給
された固体物質が滞留防止部材に衝突することで粒子同
士の凝集も防ぐことができる。Further, by providing a plurality of retention preventing members, it is possible to prevent retention of the solid substance in the upper part of the dispersion chamber, and also to prevent aggregation of particles by colliding the supplied solid substance with the retention preventing member. You can
【００１０】また、滞留防止部材の幅および高さを分級
条件に応じて可変することにより、分級条件に柔軟に対
応でき、所望の粉体材料の回収率を向上できる。Further, by varying the width and height of the retention preventing member according to the classification conditions, it is possible to flexibly meet the classification conditions and improve the recovery rate of the desired powder material.
【００１１】そして、滞留防止手段は着脱可能であるこ
とにより、粉体材料の処理量、平均粒径等の条件変更に
対して容易に対応でき、切り替え時間の短縮化も図れ
る。Since the retention preventing means is detachable, it is possible to easily deal with changes in conditions such as the amount of powder material to be processed and the average particle size, and to shorten the switching time.
【００１２】また、円錐状部材の下部に、所定の厚みと
所定の直径を持つリング状部材を設けることにより、円
錐状部材の下部における流れを変化させて、円錐状部材
の中心への流れが他の場所より速くなり粉体材料が分級
室の中心に導かれ易くなり分級性が悪化することを低減
する。Further, by providing a ring-shaped member having a predetermined thickness and a predetermined diameter in the lower part of the conical member, the flow in the lower part of the conical member is changed so that the flow to the center of the conical member is changed. It becomes faster than other places, and the powder material is less likely to be guided to the center of the classifying chamber, thereby reducing deterioration of classifying property.
【００１３】更に、リング状部材を複数設けることによ
り、分級性が悪化することをより一層低減する。Further, by providing a plurality of ring-shaped members, it is possible to further reduce the deterioration of the classifying property.
【００１４】また、リング状部材の厚みや直径を分級条
件に応じて可変することにより、分級条件に柔軟に対応
でき、所望の粉体材料の回収率を向上できる。Further, by varying the thickness and diameter of the ring-shaped member according to the classification conditions, it is possible to flexibly meet the classification conditions and improve the recovery rate of the desired powder material.
【００１５】そして、リング状部材は着脱可能であるこ
とにより、リング状部材の高さ及び厚みの調整、分級性
の変更等の条件変更に対して容易に対応でき、切り替え
時間の短縮化も図れる。Since the ring-shaped member is detachable, it is possible to easily deal with condition changes such as adjustment of height and thickness of the ring-shaped member, change of classifying property, and shortening of switching time. .
【００１６】[0016]
【発明の実施の形態】本発明の分級装置は、分散室の上
部に設けられた粉体材料供給口から供給された粉体材料
は分散室内部に形成された旋回流によって旋回分散作用
を受けて超微粉を排出し、更に分級室へと導かれて遠心
分離によって粉体材料を粗粉と微粉に分級する。そし
て、分級室に設けられた滞留防止手段は、分散室内の上
部旋回流を変化させ、粉体材料の固体粒子の滞留を防止
する。BEST MODE FOR CARRYING OUT THE INVENTION In the classifying device of the present invention, the powder material supplied from the powder material supply port provided in the upper part of the dispersion chamber is subjected to the swirling dispersion action by the swirling flow formed inside the dispersion chamber. Then, the ultrafine powder is discharged, and then the powder material is guided to a classification chamber and centrifuged to classify the powder material into coarse powder and fine powder. Then, the retention preventing means provided in the classification chamber changes the upper swirl flow in the dispersion chamber to prevent retention of solid particles of the powder material.
【００１７】［実施例］図１は本発明の一実施例に係る
分級装置の構成を示す断面図である。同図において、図
８と同じ参照符号は同じ構成要素を示す。異なる要素と
して、本実施例の分級装置は、分散室３の超微粉を排出
する排気管２に滞留防止部材１１を有している。図１に
示すように、この滞留防止手段１１は分散室３の排気管
２に接するように設置されている。このように設定され
るのは、図１に示したように、分散室３に供給された固
体物質は分散室３を旋回しながら下降して分級室９へと
導かれるが、分散室３の上部において滞留防止手段１１
により固体物質が凝集することを防止する。つまり、こ
の滞留防止手段１１が設けられたことにより、排気管２
の周辺の流れが変化し、固体物質の滞留が減少する。さ
らに、供給された固体物質が滞留防止部材１１に衝突す
ることにより、凝集した粒子の分散作用が働き、分散室
３での固体物質の分散性が向上する。なお、本実施例に
おける滞留防止手段１１は長方形の板状としたが、これ
に限定する必要はなく、湾曲状でもよいことは言うまで
もない。[Embodiment] FIG. 1 is a sectional view showing the structure of a classification apparatus according to an embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 8 indicate the same components. As a different element, the classification apparatus of this embodiment has a retention prevention member 11 in the exhaust pipe 2 for discharging the ultrafine powder in the dispersion chamber 3. As shown in FIG. 1, the retention preventing means 11 is installed in contact with the exhaust pipe 2 of the dispersion chamber 3. As shown in FIG. 1, the solid substance supplied to the dispersion chamber 3 descends while swirling in the dispersion chamber 3 and is guided to the classification chamber 9 as shown in FIG. Retention prevention means 11 at the upper part
Prevents the solid substance from aggregating. That is, since the retention preventing means 11 is provided, the exhaust pipe 2
The flow around is changed and the retention of solid material is reduced. Further, the supplied solid substance collides with the retention preventing member 11 to act to disperse the agglomerated particles and improve the dispersibility of the solid substance in the dispersion chamber 3. In addition, although the retention means 11 in this embodiment has a rectangular plate shape, it is not limited to this, and needless to say, it may have a curved shape.
【００１８】また、分散室３の滞留防止部材を複数設け
たことにより、分散室上部の固体物質の滞留を防止し、
また、供給された固体物質が滞留防止部材に衝突するこ
とで粒子同士の凝集も防ぐことができる。Further, by providing a plurality of retention preventing members in the dispersion chamber 3, it is possible to prevent retention of the solid substance above the dispersion chamber,
In addition, the supplied solid substance collides with the retention preventing member to prevent aggregation of particles.
【００１９】また、図９に示す従来の分級装置の分級室
内部には分布を持った流れが形成されており、特に円錐
状部材下部壁面付近は他の場所に比べて速度が速くなっ
ているため、分級室内に導かれた固体物質は分級装置中
心部へと導かれやすくなる。そこで、図４に示すよう
に、分級室９の上部に設けられた円錐状部材７の下部に
リング状部材１２を設けることにより、粗粉回収側へと
回収されるべき固体物質が微粉回収側へと導かれ分級精
度を低下させ、壁面に沿う流れを変化させて、粗粉回収
側に導かれるべき粒径を持つ固体物質が微粉回収側に導
かれる作用を防ぐのである。なお、このリング状部材１
２は、特にその形状を問わないが、特に真円形状のもの
が好ましい。Further, a flow having a distribution is formed in the inside of the classification chamber of the conventional classification device shown in FIG. 9, and particularly near the lower wall surface of the conical member, the speed is higher than in other places. Therefore, the solid substance introduced into the classification chamber is easily guided to the central portion of the classification device. Therefore, as shown in FIG. 4, the ring-shaped member 12 is provided below the conical member 7 provided at the upper part of the classification chamber 9 so that the solid substance to be recovered to the coarse powder recovery side is fine powder recovery side. This reduces the classification accuracy, changes the flow along the wall surface, and prevents the action of a solid substance having a particle size to be guided to the coarse powder recovery side being guided to the fine powder recovery side. In addition, this ring-shaped member 1
The shape of 2 is not particularly limited, but a perfect circular shape is particularly preferable.
【００２０】更に、図５に示すように、分級室９の上部
に設けられた円錐状部材７の下部にリング状部材１２を
複数設けることにより、壁面に沿う流れが更に変化し、
粗粉回収側に導かれるべき粒径を持つ固体物質が微粉回
収側に導かれる作用をより一層防ぐことができる。Further, as shown in FIG. 5, by providing a plurality of ring-shaped members 12 below the conical member 7 provided in the upper part of the classification chamber 9, the flow along the wall surface is further changed,
It is possible to further prevent the action of the solid substance having the particle size to be guided to the coarse powder recovery side being guided to the fine powder recovery side.
【００２１】また、図６に示すように、リング状部材１
２の高さｈを分級室９の高さＨ（図１参照）の１／２以
下とした。このように設定されるのは、リング状部材１
２の高さが高すぎると、分級室内部の流れが大きく変化
し、固体物質の回収率が低下する等の問題が発生するた
め、分級室９内の流れを大きく変化させないためであ
る。なお、リング状部材１２の高さｈは分級条件に応じ
て可変できるものである。Further, as shown in FIG. 6, the ring-shaped member 1
The height h of 2 was set to 1/2 or less of the height H of the classification chamber 9 (see FIG. 1). The ring-shaped member 1 is set in this way.
This is because if the height of 2 is too high, the flow in the classification chamber will change significantly, and problems such as a decrease in the recovery rate of the solid substance will occur, so that the flow in the classification chamber 9 will not change significantly. The height h of the ring-shaped member 12 can be changed according to the classification conditions.
【００２２】更に、図４に示すように、リング状部材１
２の厚みｄを円錐状部材７の下部半径ａ（図４参照）の
３０％以下とした。このように設定されるのは、リング
状部材１２の厚みが厚すぎると、高さの条件と同様に、
分級室内部の流れが大きく変化し、固体物質の回収率が
低下する等の問題が発生するためである。なお、リング
状部材１２の厚みｄは分級条件に応じて可変できるもの
である。Further, as shown in FIG. 4, the ring-shaped member 1
The thickness d of 2 was 30% or less of the lower radius a (see FIG. 4) of the conical member 7. What is set in this way is that if the thickness of the ring-shaped member 12 is too thick, like the condition of height,
This is because the flow inside the classification chamber changes significantly and problems such as a decrease in the recovery rate of solid substances occur. The thickness d of the ring-shaped member 12 can be changed according to the classification conditions.
【００２３】また、図４に示すようにリング状部材１２
の直径ｂが、円錐状部材７の下部凸部の直径ｃ以上とし
た。このように設定されるのは、円錐状部材７の下部凸
部の直径ｃ以下に設定しても、壁面に沿う流れは大きく
変化せず、その結果、固体物質の動きもほとんど変わら
ないため、粗粉回収側に導かれるべき粒径を持つ固体物
質が、微粉回収側に導かれる作用を防ぐような効果が得
られないからである。Further, as shown in FIG. 4, the ring-shaped member 12
The diameter b is equal to or larger than the diameter c of the lower convex portion of the conical member 7. The reason for this setting is that even if the diameter is set to be equal to or smaller than the diameter c of the lower convex portion of the conical member 7, the flow along the wall surface does not change significantly, and as a result, the movement of the solid substance also hardly changes. This is because the solid substance having the particle size to be guided to the coarse powder recovery side cannot obtain the effect of preventing the action to be guided to the fine powder recovery side.
【００２４】そして、図６中矢印Ｃで示す、リング状部
材１２の上部外側及び／又は内側を曲面形状部とした。
このように設定されるのは、円錐状部材７の下部にリン
グ状部材１２を設けた取り付け部分に流れが淀みやすく
なり、連続運転をする場合固体物質が堆積しやすくな
り、回収率が低下し、清掃性が悪くなる等の不具合を防
止するためである。The outer side and / or the inner side of the ring-shaped member 12 shown by arrow C in FIG.
The reason for this setting is that the flow easily stagnates at the mounting portion where the ring-shaped member 12 is provided at the bottom of the conical member 7, and solid substances tend to accumulate during continuous operation, reducing the recovery rate. This is to prevent problems such as poor cleanability.
【００２５】また、図１の滞留防止手段１１を脱着可能
としたことによって、滞留防止手段防止部材を分散室部
材上部に設けることが容易となり、粉体材料の処理量、
平均粒径等の条件変更に対して容易に対応でき、切り替
え時間の短縮化も図れる。Further, by making the retention preventing means 11 of FIG. 1 detachable, it becomes easy to provide the retention preventing means preventing member on the upper part of the dispersion chamber member, and the processing amount of the powder material,
Changes in conditions such as the average particle size can be easily dealt with, and the switching time can be shortened.
【００２６】更に、図４から図６に示すリング状部材１
２を脱着可能とするために、図７に示すリング状部材１
２を脱着機構１３、例えばネジ止めなどで設けることに
よって、リング状部材１２を分級室９の上部に設けられ
た円錐状部材７の下部に設けることが容易となり、リン
グの高さ調整も容易となる。また、リング状部材を脱着
可能としたことによって、リング状部材の切り替え作業
の短縮化も図れる。Furthermore, the ring-shaped member 1 shown in FIGS.
The ring-shaped member 1 shown in FIG.
By providing 2 with the attachment / detachment mechanism 13, for example, screwing, it becomes easy to provide the ring-shaped member 12 at the lower part of the conical member 7 provided at the upper part of the classification chamber 9, and the ring height can be easily adjusted. Become. Further, by making the ring-shaped member removable, the work of switching the ring-shaped member can be shortened.
【００２７】次に、本実施例による具体例、つまりスチ
レンーアクリル共重合体樹脂８５重量部とカーボンブラ
ック１５重量部の混合物を溶融混練、冷却し、これをハ
ンマーミルで粗粉砕した後、ジェットミルにて、微粉砕
された固体物質を、図１に示す分級装置によって分級を
行った例を以下に示す。Next, a specific example according to this example, that is, a mixture of 85 parts by weight of styrene-acrylic copolymer resin and 15 parts by weight of carbon black was melt-kneaded, cooled, coarsely crushed with a hammer mill, and then jetted. An example in which the finely pulverized solid substance is classified by the classifier shown in FIG. 1 in the mill is shown below.
【００２８】（具体例１）図１に示すように、排気管２
の側面に滞留防止手段１１を設置した分級装置におい
て、上記組成の固体物質を供給し、排気ブロワー圧１６
２０ｍｍＡｑに設定し、体積平均粒径７．８μｍ（コー
ルターカウンタによる測定）になるように分級を実施し
たところ、フィード量１０．５ｋｇ／ｈに対して、体積
平均粒径７．６６μｍ、４μｍ以下の微粉含有率（重量
％）７．５９、１２．７μｍ以上の粗粉含有率（重量
％）４．２１％であり、下記に示す比較例に対しシャー
プな粒度分布が得られた。(Specific Example 1) As shown in FIG. 1, an exhaust pipe 2
In a classifier equipped with retention preventing means 11 on the side surface of the device, the solid substance having the above composition is supplied, and the exhaust blower pressure 16
When the volume average particle diameter was set to 20 mmAq and classification was performed so that the volume average particle diameter was 7.8 μm (measured by a Coulter counter), the volume average particle diameter was 7.66 μm or 4 μm or less with respect to the feed amount of 10.5 kg / h. The fine powder content (wt%) was 7.59, and the coarse powder content (wt%) of 12.7 μm or more was 4.21%, and a sharp particle size distribution was obtained as compared with the comparative example shown below.
【００２９】（具体例２）排気管２の側面に滞留防止手
段１１を３つ設置し、他は具体例１と同条件で処理し
た。その結果、フィード量１０．５ｋｇ／ｈに対して、
体積平均粒径７．７０μｍ、４μｍ以下の微粉含有率
（重量％）６．６７、１２．７μｍ以上の粗粉含有率
（重量％）２．３１％であり、比較例に対しシャープな
粒度分布が得られた。(Specific Example 2) Three retention preventing means 11 were installed on the side surface of the exhaust pipe 2, and other conditions were the same as those of the specific example 1. As a result, for the feed rate of 10.5 kg / h,
Volume average particle size is 7.70 μm, fine powder content (wt%) of 6 μm or less is 6.67, coarse powder content of 12.7 μm or more (wt%) is 2.31%, which is sharper than the comparative example. was gotten.
【００３０】（具体例３）分級室３の上部に設けられた
円錐状部材７の下部にリング状部材１２を設けた分級装
置において、上記組成の固体物質を供給し、排気ブロワ
ー圧１６２０ｍｍＡｑ、リング状部材１２の高さｈを分
級室９の高さＨの約１／２０、リング状部材１２の厚さ
ｄを１．５ｍｍ、直径ｂを１７０ｍｍに設定し、他は具
体例１と同条件で処理した。体積平均粒径７．８μｍ
（コールターカウンタによる測定）になるように分級を
実施したところ、フィード量１０．５ｋｇ／ｈに対し
て、体積平均粒径７．７２μｍ、４μｍ以下の微粉含有
率（重量％）６．０７、１２．７μｍ以上の粗粉含有率
（重量％）２．８１％であり、比較例に対しシャープな
粒度分布が得られた。(Specific Example 3) In a classifier in which a ring-shaped member 12 is provided below a conical member 7 provided above the classification chamber 3, a solid substance having the above composition is supplied, an exhaust blower pressure of 1620 mmAq, and a ring. The height h of the ring-shaped member 12 is set to about 1/20 of the height H of the classification chamber 9, the thickness d of the ring-shaped member 12 is set to 1.5 mm, and the diameter b is set to 170 mm. Processed in. Volume average particle size 7.8 μm
Classification was carried out so as to obtain (measurement by Coulter counter), and fine powder content (wt%) 6.07, 12 with a volume average particle size of 7.72 μm, 4 μm or less for a feed rate of 10.5 kg / h. The coarse powder content (wt%) of 0.7 μm or more was 2.81%, and a sharp particle size distribution was obtained as compared with the comparative example.
【００３１】（具体例４）具体例１と同じ組成の固体物
質を供給して、リング状部材１２の直径ｂが１７０ｍｍ
と１５０ｍｍの２つを設け、他は具体例１と同条件で処
理した。その結果、フィード量１０．５ｋｇ／ｈに対し
て、体積平均粒径７．７３μｍ、４μｍ以下の微粉含有
率（重量％）６．００、１２．７μｍ以上の粗粉含有率
（重量％）２．８３％であり、比較例に対しシャープな
粒度分布が得られた。(Specific Example 4) A solid material having the same composition as in Specific Example 1 was supplied, and the diameter b of the ring-shaped member 12 was 170 mm.
And 150 mm were provided, and the other conditions were the same as in Example 1. As a result, with respect to the feed amount of 10.5 kg / h, the volume average particle size of 7.73 μm, the content of fine powder of 4 μm or less (wt%) 6.00, and the content of coarse powder of 12.7 μm or more (wt%) 2 It was 0.83%, and a sharp particle size distribution was obtained as compared with the comparative example.
【００３２】（具体例５）具体例１と同じ組成の固体物
質を供給して、リング状部材１２の上部外側を曲面形状
とし、他は具体例１と同条件で処理した。その結果、円
錐状部材下部取り付け部分の固体物質の堆積が減少し、
清掃性も改善された。(Specific Example 5) A solid substance having the same composition as in Specific Example 1 was supplied so that the upper outside of the ring-shaped member 12 had a curved surface shape, and the other conditions were the same as in Specific Example 1. As a result, the deposition of solid material on the lower part of the conical member is reduced,
Cleanability was also improved.
【００３３】（具体例６）具体例１と同じ組成の固体物
質を供給して、リング状部材１２の上部内側を曲面形状
とし、他は具体例１と同条件で処理した。その結果、円
錐状部材下部取り付け部分の固体物質の堆積が減少し、
清掃性も改善された。(Specific Example 6) A solid substance having the same composition as in Specific Example 1 was supplied so that the inside of the upper portion of the ring-shaped member 12 was curved, and the other conditions were the same as in Specific Example 1. As a result, the deposition of solid material on the lower part of the conical member is reduced,
Cleanability was also improved.
【００３４】（具体例７）具体例１と同じ組成の固体物
質を供給して、滞留防止手段１１を脱着可能とし、他は
具体例１と同条件で処理した後、清掃切替を実施した。
その結果、清掃切替時間について、具体例１に比べ約１
０％の短縮が可能となった。(Specific Example 7) A solid substance having the same composition as in Specific Example 1 was supplied to make the retention preventing means 11 detachable, and the other conditions were the same as those in Specific Example 1, and then cleaning switching was performed.
As a result, the cleaning switching time is about 1 compared to specific example 1.
It has become possible to shorten by 0%.
【００３５】（具体例８）具体例１と同じ組成の固体物
質を供給して、リング状部材１２を脱着可能とし、他は
具体例１と同条件で処理した後、清掃切替を実施した。
その結果、清掃切替時間について、具体例１に比べ約１
５％の短縮が可能となった。(Specific Example 8) A solid substance having the same composition as in Specific Example 1 was supplied to make the ring-shaped member 12 attachable / detachable, and the other conditions were the same as those in Specific Example 1, and then cleaning switching was performed.
As a result, the cleaning switching time is about 1 compared to specific example 1.
It has become possible to shorten by 5%.
【００３６】（比較例）上記組成の固体物質を供給し
て、図８に示す従来の分級装置を用い、排気ブロワー圧
１６２０ｍｍＡｑの条件で、体積平均粒径７．８μｍ
（コールターカウンタによる測定）になるように分級を
実施した処理した。その結果、フィード量１０．５ｋｇ
／ｈに対して、体積平均粒径７．８８μｍ、４μｍ以下
の微粉含有率（重量％）１０．７１、１２．７μｍ以上
の粗粉含有率（重量％）４．３０％であった。(Comparative Example) A solid substance having the above composition was supplied, and a conventional classifier shown in FIG. 8 was used to set an exhaust blower pressure of 1620 mmAq and a volume average particle diameter of 7.8 μm.
(Classification by Coulter Counter) As a result, feed amount 10.5 kg
/ H, the volume average particle diameter was 7.88 μm, the fine powder content rate (wt%) 10.71 of 4 μm or less, and the coarse powder content rate (wt%) 4.30% of 12.7 μm or more.
【００３７】なお、本発明は上記実施例に限定されるも
のではなく、特許請求の範囲内の記載であれば多種の変
形や置換可能であることは言うまでもない。It is needless to say that the present invention is not limited to the above embodiments, and various modifications and substitutions can be made within the scope of the claims.
【００３８】[0038]
【発明の効果】以上説明したように、搬送空気と共に供
給される粉体材料に旋回流を与えて粉体材料を分散する
分散室と、該分散室の下方に連続して設けられて分散室
から流入する粉体材料を微粉と粗粉とに遠心分級する分
級室と、分散室と分級室とを区画する円錐状部材と、分
級室を区画し、粉体材料を微粉と粗粉に分級する分級板
とを有し、分散室の上部に設けられた粉体材料供給口か
ら供給された粉体材料は分散室内部に形成された旋回流
によって旋回分散作用を受けて超微粉を排出し、更に分
級室へと導かれて遠心分離によって粉体材料を粗粉と微
粉に分級する、本発明に係る分級装置は、分散室内の上
部旋回流を変化させ、粉体材料の固体粒子の滞留を防止
する滞留防止手段を設けたことに特徴がある。また、滞
留防止手段は、分散室内での粉体材料の旋回半径を分級
室から分散室の粉体材料供給口に向かって小さくする手
段である。更に、滞留防止手段は分散室の粉体材料供給
口から分散室に向かって分散室の壁面断面形状を斜面に
して形成されることにより構成する。また、また、滞留
防止手段は超微粉を排出する排気管に所定の幅および高
さを持つ滞留防止部材を設けることにより構成する。よ
って、分散室での粉体材料の分散性及び分級室での分級
精度を向上することができる。As described above, a dispersion chamber for distributing a powder material by giving a swirl flow to the powder material supplied together with the carrier air, and a dispersion chamber continuously provided below the dispersion chamber. Classifying the powder material flowing in from the powder into a fine powder and a coarse powder, a conical member that divides the dispersion chamber and the classification chamber, and the classification chamber to divide the powder material into fine powder and coarse powder. The powder material supplied from the powder material supply port provided at the upper part of the dispersion chamber has a swirling flow formed inside the dispersion chamber and is subjected to a swirling dispersion action to discharge ultrafine powder. , Further classifying the powder material into coarse powder and fine powder by centrifugal separation by being guided to the classifying chamber, the classifying device according to the present invention changes the upper swirl flow in the dispersion chamber to retain solid particles of the powder material. It is characterized in that a retention preventing means for preventing the above is provided. The retention preventing means is means for reducing the turning radius of the powder material in the dispersion chamber from the classification chamber toward the powder material supply port of the dispersion chamber. Further, the retention preventing means is formed by forming the wall surface cross section of the dispersion chamber into an inclined surface from the powder material supply port of the dispersion chamber toward the dispersion chamber. Further, the retention preventing means is configured by providing a retention preventing member having a predetermined width and height in the exhaust pipe for discharging the ultrafine powder. Therefore, the dispersibility of the powder material in the dispersion chamber and the classification accuracy in the classification chamber can be improved.
【００３９】更に、滞留防止部材を複数設けたことによ
り、分散室上部の固体物質の滞留を防止し、また、供給
された固体物質が滞留防止部材に衝突することで粒子同
士の凝集も防ぐことができる。Further, by providing a plurality of retention preventing members, it is possible to prevent retention of the solid substance in the upper part of the dispersion chamber, and also to prevent aggregation of particles by colliding the supplied solid substance with the retention preventing member. You can
【００４０】また、滞留防止部材の幅および高さを分級
条件に応じて可変することにより、分級条件に柔軟に対
応でき、所望の粉体材料の回収率を向上できる。By varying the width and height of the retention preventing member according to the classification conditions, the classification conditions can be flexibly dealt with and the desired powder material recovery rate can be improved.
【００４１】そして、滞留防止手段は着脱可能であるこ
とにより、粉体材料の処理量、平均粒径等の条件変更に
対して容易に対応でき、切り替え時間の短縮化も図れ
る。Since the retention preventing means is detachable, it is possible to easily deal with changes in conditions such as the amount of powder material to be processed and the average particle size, and the switching time can be shortened.
【００４２】また、円錐状部材の下部に、所定の厚みと
所定の直径を持つリング状部材を設けることにより、円
錐状部材の下部における流れを変化させて、円錐状部材
の中心への流れが他の場所より速くなり粉体材料が分級
室の中心に導かれ易くなり分級性が悪化することを低減
する。Further, by providing a ring-shaped member having a predetermined thickness and a predetermined diameter in the lower part of the conical member, the flow in the lower part of the conical member is changed so that the flow to the center of the conical member is changed. It becomes faster than other places, and the powder material is less likely to be guided to the center of the classifying chamber, thereby reducing deterioration of classifying property.
【００４３】更に、リング状部材を複数設けることによ
り、分級性が悪化することをより一層低減する。Further, by providing a plurality of ring-shaped members, it is possible to further reduce the deterioration of the classifying property.
【００４４】また、リング状部材の厚みや直径を分級条
件に応じて可変することにより、分級条件に柔軟に対応
でき、所望の粉体材料の回収率を向上できる。By varying the thickness and diameter of the ring-shaped member according to the classification conditions, the classification conditions can be flexibly accommodated and the desired powder material recovery rate can be improved.
【００４５】そして、リング状部材は着脱可能であるこ
とにより、リング状部材の高さ及び厚みの調整、分級性
の変更等の条件変更に対して容易に対応でき、切り替え
時間の短縮化も図れる。Since the ring-shaped member is removable, it is possible to easily deal with condition changes such as adjustment of the height and thickness of the ring-shaped member, change of classification property, etc., and it is possible to shorten the switching time. .
【図１】本発明の一実施例に係る分級装置の構成を示す
断面図である。FIG. 1 is a cross-sectional view showing a configuration of a classification device according to an embodiment of the present invention.
【図２】図１の上面断面図である。FIG. 2 is a top sectional view of FIG.
【図３】図２の別の構成を示す上面断面図である。FIG. 3 is a top sectional view showing another configuration of FIG.
【図４】図１の円錐状部材の構成を示す断面図である。FIG. 4 is a cross-sectional view showing the configuration of the conical member shown in FIG.
【図５】円錐状部材の別の構成を示す断面図である。FIG. 5 is a cross-sectional view showing another configuration of the conical member.
【図６】リング状部材の改良例を示す部分断面図であ
る。FIG. 6 is a partial cross-sectional view showing an improved example of the ring-shaped member.
【図７】リング状部材の別の改良例を示す部分断面図で
ある。FIG. 7 is a partial cross-sectional view showing another modified example of the ring-shaped member.
【図８】従来の分級装置の構成を示す断面図である。FIG. 8 is a cross-sectional view showing a configuration of a conventional classification device.
【図９】従来の分級装置における円錐状部材の構成を示
す断面図である。FIG. 9 is a cross-sectional view showing a configuration of a conical member in a conventional classification device.
１ 供給管 ２ 排気管 ３ 分散室 ４ エアー流入口 ５ 微粉排出口 ６ 粗粉排出口 ７ 円錐状部材 ８ 分級板 ９ 分級室 １０ 気流の流れ １１ 滞留防止手段 １２ リング状部材 １３ 脱着機構 1 supply pipe 2 exhaust pipe 3 dispersion chambers 4 Air inlet 5 Fine powder outlet 6 coarse powder outlet 7 Conical member 8 classifier 9 classification room Flow of 10 air flow 11 Retention prevention means 12 Ring-shaped member 13 Desorption mechanism
Claims (10)
回流を与えて粉体材料を分散する分散室と、該分散室の
下方に連続して設けられて分散室から流入する粉体材料
を微粉と粗粉とに遠心分級する分級室と、分散室と分級
室とを区画する円錐状部材と、分級室を区画し、粉体材
料を微粉と粗粉に分級する分級板とを有し、分散室の上
部に設けられた粉体材料供給口から供給された粉体材料
は分散室内部に形成された旋回流によって旋回分散作用
を受けて超微粉を排出し、更に分級室へと導かれて遠心
分離によって粉体材料を粗粉と微粉に分級する分級装置
において、分散室内の上部旋回流を変化させ、粉体材料
の固体粒子の滞留を防止する滞留防止手段を設けたこと
を特徴とする分級装置。1. A dispersion chamber for distributing a powder material by giving a swirl flow to the powder material supplied together with carrier air, and a powder material continuously provided below the dispersion chamber and flowing from the dispersion chamber. Has a classification chamber for centrifugal classification of fine powder and coarse powder, a conical member that divides the dispersion chamber and the classification chamber, and a classification plate that divides the classification chamber and classifies the powder material into fine powder and coarse powder. Then, the powder material supplied from the powder material supply port provided in the upper part of the dispersion chamber is subjected to the swirling dispersion action by the swirling flow formed in the dispersion chamber to discharge the ultrafine powder, and further into the classification chamber. In a classifier that guides and separates powder material into coarse powder and fine powder by centrifugal separation, a retention preventing means that changes the upper swirl flow in the dispersion chamber and prevents retention of solid particles of the powder material is provided. Characterizing classifier.
記超微粉を排出する排気管に所定の幅および高さを持つ
滞留防止部材を設ける請求項１記載の分級装置。2. The classification device according to claim 1, wherein the staying prevention means is provided with a staying prevention member having a predetermined width and height in an exhaust pipe for discharging the ultrafine powder in the dispersion chamber.
又は２記載の分級装置。前記滞留防止部材を複数設けた
請求項１又は２記載の分級装置。3. The plurality of retention preventing members are provided.
Or the classification device according to 2. The classification device according to claim 1, wherein a plurality of the retention preventing members are provided.
条件に応じて可変する請求項１から３のいずれかに記載
の分級装置。4. The classification device according to claim 1, wherein the width and height of the retention preventing member are varied according to classification conditions.
項１から４のいずれかに記載の分級装置。5. The classification device according to claim 1, wherein the retention preventing means is removable.
所定の直径を持つリング状部材を設ける請求項１から５
のいずれかに記載の分級装置。6. A ring-shaped member having a predetermined thickness and a predetermined diameter is provided below the conical member.
The classification device according to any one of 1.
記載の分級装置。7. The plurality of ring-shaped members are provided.
Classification device described.
級条件に応じて可変する請求項６又は７に記載の分級装
置。8. The classification device according to claim 6, wherein the thickness and the diameter of the ring-shaped member are varied according to classification conditions.
項６から８のいずれかに記載の分級装置。9. The classification device according to claim 6, wherein the ring-shaped member is removable.
る潜像を顕像化するトナーの製造方法において、粉体材
料を粉砕化した後に、請求項１から９記載の分級装置で
分級してトナーを製造することを特徴とするトナーの製
造方法。10. A method for producing a toner for visualizing a latent image used in an electrophotographic image forming apparatus, wherein the powder material is pulverized and then classified by the classifying apparatus according to claim 1. A method for producing a toner, which comprises producing a toner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001377690A JP2003175343A (en) | 2001-12-11 | 2001-12-11 | Apparatus and method for classification |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001377690A JP2003175343A (en) | 2001-12-11 | 2001-12-11 | Apparatus and method for classification |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003175343A true JP2003175343A (en) | 2003-06-24 |
Family
ID=19185594
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001377690A Pending JP2003175343A (en) | 2001-12-11 | 2001-12-11 | Apparatus and method for classification |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003175343A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005152801A (en) * | 2003-11-26 | 2005-06-16 | Ricoh Co Ltd | Classifier and method for producing developer |
| JP2005193089A (en) * | 2003-12-26 | 2005-07-21 | Kao Corp | Airflow type classifier |
| JP2006055838A (en) * | 2004-07-20 | 2006-03-02 | Ricoh Co Ltd | Air current type classifier, apparatus for producing small particle, and method for producing small particle |
| JP2009034560A (en) * | 2007-07-31 | 2009-02-19 | Nisshin Seifun Group Inc | Powder classifying apparatus |
| US8178276B2 (en) | 2008-03-07 | 2012-05-15 | Ricoh Company Limited | Method of manufacturing toner |
| CN109604161A (en) * | 2018-11-27 | 2019-04-12 | 湖南图强科技开发有限公司 | It is a kind of based on point niblet selection by winnowing screening plant for spreading technology of tempering |
-
2001
- 2001-12-11 JP JP2001377690A patent/JP2003175343A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005152801A (en) * | 2003-11-26 | 2005-06-16 | Ricoh Co Ltd | Classifier and method for producing developer |
| JP2005193089A (en) * | 2003-12-26 | 2005-07-21 | Kao Corp | Airflow type classifier |
| JP2006055838A (en) * | 2004-07-20 | 2006-03-02 | Ricoh Co Ltd | Air current type classifier, apparatus for producing small particle, and method for producing small particle |
| JP4644061B2 (en) * | 2004-07-20 | 2011-03-02 | 株式会社リコー | Airflow type classifier, small particle size manufacturing apparatus, and small particle size manufacturing method |
| JP2009034560A (en) * | 2007-07-31 | 2009-02-19 | Nisshin Seifun Group Inc | Powder classifying apparatus |
| US8100269B2 (en) | 2007-07-31 | 2012-01-24 | Nisshin Seifun Group, Inc. | Powder classifying device |
| CN101357365B (en) * | 2007-07-31 | 2013-01-02 | 日清制粉集团本社股份有限公司 | Powder classifying device |
| US8668090B2 (en) | 2007-07-31 | 2014-03-11 | Nisshin Seifun Group Inc. | Powder classifying device |
| US8178276B2 (en) | 2008-03-07 | 2012-05-15 | Ricoh Company Limited | Method of manufacturing toner |
| CN109604161A (en) * | 2018-11-27 | 2019-04-12 | 湖南图强科技开发有限公司 | It is a kind of based on point niblet selection by winnowing screening plant for spreading technology of tempering |
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