JPS5944105B2 - Disc-type fine grinder for synthetic resin grinding - Google Patents

Description

【発明の詳細な説明】 本発明は外周に於て僅かな間隙、例えば０．２５乃至０
．０５ｍｍの間隙で向き合つていて互に反対の方向に高
速で例えば外周に於いて１５０乃至２５０ｍ／ｓの相対
速度で回転する円板の相い対する面の外周に近い環状部
分に半径方向の多数の刃を配夕１ル、かつ一方の円板の
刃の刃先と他方の円板の刃の刃先との間の円板の中心線
方向の間隙が円板の外周に向つて狭くなるようにして、
円板と円板の間に供給された主として熱可塑性合成樹脂
粒の表面を切削して例えば０．３乃至０．１５ｍｍ以下
の微粉の製造が可能である円板式微粉砕機を提供しよう
とするものである。DETAILED DESCRIPTION OF THE INVENTION The present invention is characterized in that the outer periphery has a small gap, for example 0.25 to 0.
．． A radial ring is attached to an annular portion near the outer periphery of opposite surfaces of a disk which faces each other with a gap of 0.05 mm and rotates in opposite directions at high speed, for example, at a relative speed of 150 to 250 m/s at the outer periphery. A large number of blades are arranged so that the gap in the direction of the center line of the disk between the cutting edge of the blade of one disk and the cutting edge of the blade of the other disk becomes narrower toward the outer periphery of the disk. and
It is an object of the present invention to provide a disc-type pulverizer capable of producing fine powder of, for example, 0.3 to 0.15 mm or less by cutting the surface of mainly thermoplastic synthetic resin particles supplied between discs. be.

前記のような多数の刃を有する左右の円板の片側を固定
し、その中心部に原料供給口を設け他方の円板のみを回
転させるときは原料の供給は簡単であるが、左右の円板
の刃と刃の間にある原料粒は高速回転する円板の回転速
度の凡そ半分の回転速度で円板の中心線の周りに回転す
るので、この原料粒に大きな遠心力が作用し、左右の円
板の刃と刃の間の円板の外周に向つて減少する楔状間隙
に強く押し込まれるので、円板に設けた刃によつて切削
される深さが大きくなり細かな微粉を製造することは困
難である。When fixing one side of the left and right discs with a large number of blades as described above, and rotating only the other disc with a raw material supply port in the center, feeding the raw material is easy, but if the left and right discs have a large number of blades, The raw material grains between the blades of the plate rotate around the center line of the disc at a rotation speed that is approximately half the rotation speed of the high-speed rotating disc, so a large centrifugal force acts on these raw material grains. It is strongly pushed into the wedge-shaped gap between the blades of the left and right discs, which decreases toward the outer periphery of the disc, so the depth of cutting by the blades provided on the disc increases, producing fine powder. It is difficult to do so.

円板の回転速度を低下させ過ると粉砕物の排出速度が低
下するので粉砕能力が低下すると共に粉砕によつて生じ
る熱によつて温度が高められた原料が刃と刃の間を通過
する時間が長くなり、円板の刃に融着し易くなる欠点を
生じる。左右の円板を互に反対方向に回転させれば左右
の円板の刃と刃の間の原料が円板の中心線のまわりに高
速回転して刃と刃の間の楔状間隙に強く押し込まれる現
象が生じないので微粉を製造し得ることを見い出した。If the rotational speed of the disk is reduced too much, the discharge speed of the crushed material will decrease, resulting in a decrease in the crushing capacity, and the raw material, whose temperature has been raised by the heat generated by the crushing, will pass between the blades. The disadvantage is that it takes a long time and tends to be fused to the blade of the disc. When the left and right discs are rotated in opposite directions, the raw material between the blades of the left and right discs rotates at high speed around the center line of the disc and is strongly pushed into the wedge-shaped gap between the blades. It has been found that fine powder can be produced because the phenomenon of oxidation does not occur.

しかしながらこの場合には原料の供給に困難を生じる。
片側の円板を回転させる軸を中空として、これより原料
を空気流によつて左右円板の間に供給することは例えば
直径６００ｍｍ周速１２５ｍ／ｓの円板を回転させてい
る中空軸の回転速度は約４０００ｒ．ｐ訓の高速である
ため中空軸の内部に於て遠心力の作用で原料は内壁に固
く堆積し空気流では、たとえこの軸が垂直であつても軸
方向に輸送することは出来なくなる。However, in this case, difficulties arise in supplying raw materials.
For example, if the shaft that rotates one side of the disk is hollow, and the raw material is supplied between the left and right disks by air flow, the rotational speed of the hollow shaft that rotates the disk with a diameter of 600 mm and a circumferential speed of 125 m/s is, for example, is about 4000r. Because of the high speed, the centrifugal force inside the hollow shaft causes the raw material to be firmly deposited on the inner wall, and cannot be transported in the axial direction by air flow, even if the shaft is perpendicular.

内部に原料送入管を挿入するためにこの中空軸の直径は
一方の軸に対して大きくなるのでこれを支持する軸受は
大型となり且つ高速回転させられるので温度が高くなる
。この軸受よりの伝熱によつて中空軸の温度も高められ
るので、低融点の合成樹脂を粉砕する場合には中空軸の
内壁に融着する現象も発生する。従つて遠心力によつて
中空軸の内壁に堆積した原料をスクリユ一等で強制的に
送り出すことも不適当である。中空軸の内部に原料送人
管を挿人し、これより原料を供給しようとしても、原料
送入管から左右円板の中央部の空間に飛び込み、他方の
円板が取り付けられていて高速回転している軸の端面に
突き当つて跳ね飛ばされて返つて来る原料中のあるもの
が、高速回転している中空軸の円板を取り付けてある端
部の内壁と原料送入管の端部の外周との間の隙間に侵入
し、中空軸の端部の内壁に遠心力によつて堆積させられ
る。Since the diameter of this hollow shaft is larger than that of the other shaft in order to insert the raw material feed pipe inside, the bearing supporting it becomes large in size and rotates at high speed, resulting in a high temperature. This heat transfer from the bearing also raises the temperature of the hollow shaft, so that when a synthetic resin with a low melting point is pulverized, it may fuse to the inner wall of the hollow shaft. Therefore, it is also inappropriate to forcibly send out raw materials deposited on the inner wall of the hollow shaft by centrifugal force using a screw or the like. Even if you insert a raw material feed tube inside the hollow shaft and try to feed raw materials from it, it will jump from the raw material feed tube into the space in the center of the left and right disks, and the other disk will be attached and rotate at high speed. Some of the raw material that hits the end face of the shaft that is rotating and is thrown away and returns to the inner wall of the end where the disc of the hollow shaft that is rotating at high speed is attached and the end of the raw material feed pipe. and the outer circumference of the hollow shaft, and is deposited on the inner wall of the end of the hollow shaft by centrifugal force.

この中空軸と共に高速回転している堆積物の厚さが増し
原料送入管の外周に接触するようになると摩擦熱によつ
て融けて流れ出し、左右円板の刃に融着し粉砕作用を止
めて仕舞うからである。本発明は前記中空軸の円板を取
り付けてある端部に、中空軸の内部に挿入された原料送
入管の端部との間に僅かの隙間があるようにした多数の
遠心送風翼或は軸流送風翼を設け前記の困難を克服する
ことを特徴とするものである。As the deposits rotating at high speed with this hollow shaft increase in thickness and come into contact with the outer periphery of the raw material feed pipe, they melt due to frictional heat and flow out, fusing to the blades of the left and right discs and stopping the crushing action. This is because it ends up being closed. The present invention comprises a plurality of centrifugal blower blades or is characterized by providing an axial flow blower blade to overcome the above-mentioned difficulties.

中空軸と共に高速回転する翼は左右円板の中央部の空間
を飛び交つている原料中のあるものがこの翼のところに
来てもはじき返すので、またこの送風翼は中空軸と原料
送入管との間に外気を取り入れ左右円板の間に排出され
ているので翼と原料送入管との間の隙間にも原料中の微
粉の侵人を許さない。The blades that rotate at high speed together with the hollow shaft will repel any material in the raw material that is flying around in the center space of the left and right discs even if it comes to these blades. Since outside air is taken in between the blades and the left and right discs and discharged between the left and right discs, fine powder in the raw materials is not allowed to enter the gap between the blades and the raw material feed pipe.

本発明によればこのように簡単な構造の翼で中空軸の内
壁と原料送入管との間に原料が飛び込むことを完全に防
止出来、原料を互に反対の方向に回転する円板の間に連
続的に係給することを可能にする。According to the present invention, it is possible to completely prevent the raw material from jumping between the inner wall of the hollow shaft and the raw material feed pipe with the blades having such a simple structure, and to transfer the raw material between the disks rotating in opposite directions. Enables continuous mooring.

これによつて、左右円板を互に反対の方向に回転させる
ことにより非常に細かな粉砕物を得ることが出来、且つ
これらの円板を高速回転させ得るので機械の寸法、重量
に対し著しく粉砕能力の大きな熱可塑性合成樹脂用円板
式微粉砕機を提供することが出来る。本発明は熱可塑性
合成樹脂だけではなく合成ゴム等の微粉砕にも利用する
ことが出来る。This makes it possible to obtain very fine pulverized material by rotating the left and right disks in opposite directions, and since these disks can be rotated at high speed, the size and weight of the machine are significantly reduced. It is possible to provide a disc-type pulverizer for thermoplastic synthetic resins having a large crushing capacity. The present invention can be used not only for pulverizing thermoplastic synthetic resins but also for pulverizing synthetic rubbers and the like.

第１図、第２図の実施例について説明する。The embodiments shown in FIGS. 1 and 2 will be described.

多数の半径方向の刃１を有する円板２はボルト３で中空
軸４に取り付けられてある。中空軸４はケーシング５に
固定された軸受箱６の内部にある軸受７，８で支持され
、端部に取り付けられたＶプーリ９に掛けられたＶベル
口０により中心線Ａ−Ａのまわりに高速回転させられて
いる。中空軸４の円板２の取り付けてある端部には多数
の遠心送風翼１１が設けられてある。中空軸４の中空部
には中心線Ａ−Ａ上に中心があり、ケーシング５に腕金
具１２で固定され一端に原料供給シユート１３を有する
原料送入管１４が挿入されている。原料送入管の他端の
外周に設けた段と止め輪１５との間には前記の遠心送風
翼１１との間に僅かの隙間が出来るように取り付けられ
たシユラウド１６がある。多数の半径方向の刃１７を有
する円板１８はボルト１９で軸２０に取り付けられてあ
る。A disk 2 with a number of radial blades 1 is attached to a hollow shaft 4 with bolts 3. The hollow shaft 4 is supported by bearings 7 and 8 inside a bearing box 6 fixed to a casing 5, and is rotated around the center line A-A by a V-bell opening 0 hung on a V-pulley 9 attached to the end. is rotated at high speed. A large number of centrifugal blower blades 11 are provided at the end of the hollow shaft 4 to which the disk 2 is attached. A raw material feed pipe 14 is inserted into the hollow portion of the hollow shaft 4, which is centered on the center line A-A, is fixed to the casing 5 with an arm fitting 12, and has a raw material supply chute 13 at one end. A shroud 16 is installed between the stage provided on the outer periphery of the other end of the raw material feed pipe and the retaining ring 15 so as to leave a slight gap between it and the centrifugal blower blade 11. A disk 18 with a number of radial blades 17 is attached to the shaft 20 with bolts 19.

軸２０はケーシング５の扉２１に取り付けられた軸受箱
２２の内部の軸受で支持され端部に取り付けられたＶプ
ーリ２３に掛けられたＶベルト２４により中心線Ａ−Ａ
のまわりに中空軸１４と反対の方向に高速回転させられ
ている。ケーシング５には空気人口２５と粉砕物と空気
の混合物の出口管２６が設けられてある。The shaft 20 is supported by a bearing inside a bearing box 22 attached to the door 21 of the casing 5, and is moved along the center line A-A by a V-belt 24 hung on a V-pulley 23 attached to the end.
The hollow shaft 14 is rotated at high speed in a direction opposite to the hollow shaft 14. The casing 5 is provided with an air population 25 and an outlet pipe 26 for the mixture of ground material and air.

出口管２６には図示してないダクト、サイクロン、排風
機が接続している。多数の半径方向の刃１と１７の中心
線Ａ−Ａのまわりの高速回転により円板２と１８の間の
空気はこれらの円板２と１８との外周の隙間から排出さ
れ、新しい空気が原料供給シユート１３、原料送人管１
４を通つて円板２と１８の間に流れ込んでいる。A duct, a cyclone, and an exhaust fan (not shown) are connected to the outlet pipe 26. Due to the high speed rotation of the large number of radial blades 1 and 17 around the center line A-A, the air between the discs 2 and 18 is evacuated through the gaps on the outer periphery of these discs 2 and 18, and new air is introduced. Raw material supply chute 13, raw material sending pipe 1
4 and flows between the discs 2 and 18.

原料供給シユート１３に供給された粉状の原料はこの空
気流によつて原料送入管ｉを通り高速回転している軸２
０の端面に突き当り跳ね飛ばされ円板２と１８の間の空
間を飛び交りながら、刃１と刃１７の間に送り込まれ切
削作用を受ける。切削によつて生じた微粉は多数の刃１
の間の谷間、多数の刃１７の間の谷間を遠心力によつて
速かに通過し、機外の排風機によつて空気人口２５より
機内に取り入れられケーシング５の内部の円板２，１８
の外周をとりまく空間を旋回し出口管２６から流れ出る
空気によつて冷却されながら運ばれて前記のダクトを通
りサイクロンで空気と分離される。円板２と円板８の間
を飛び交つている原料中の微粉のあるものは遠心送風翼
１１に突き当るが、多数の遠心送風翼１１が高速回転し
ているのではじき返されて中空軸４の内部へと侵入する
ことは出来ない。The powdered raw material supplied to the raw material supply chute 13 passes through the raw material feed pipe i due to this air flow and is transferred to the shaft 2 which is rotating at high speed.
The blade collides with the end face of the blade 0 and is blown away, flying around in the space between the discs 2 and 18, and is then sent between the blades 1 and 17 and subjected to a cutting action. The fine powder generated by cutting is cut into a large number of blades 1.
The disk 2 inside the casing 5 is quickly passed through the valley between the blades 17 by centrifugal force, and is drawn into the machine from the air mass 25 by the exhaust fan outside the machine. 18
The air circulates through the space surrounding the outer periphery of the air, is carried while being cooled by the air flowing out from the outlet pipe 26, passes through the duct, and is separated from the air by a cyclone. Some of the fine particles in the raw material flying between the disks 2 and 8 collide with the centrifugal blower blades 11, but since the many centrifugal blowers 11 are rotating at high speed, they are repelled and hit the hollow shaft. It is not possible to penetrate into the interior of 4.

軸２０に対し中空軸４の直径は大きくなり従つて軸受７
，８は大型となり高速回転による温度上昇は大きくなる
。軸受７，８からの伝熱により中空軸４の温度も、高く
なり円板２を取り付けている端部の表面に原料の微粉が
融着し易いのであるが、本発明に於ては遠心送風翼１１
の高速回転により外気が中空軸４と原料送入管１４の間
を通つて円板２と１８の間へと流れ中空軸４を冷却して
温度を下げ前記の部分の表面に微粉が融着することも防
止される。第３図の別の実施例について説明する。The diameter of the hollow shaft 4 is larger than that of the shaft 20, so that the bearing 7
, 8 are large and the temperature rise due to high speed rotation becomes large. Due to the heat transfer from the bearings 7 and 8, the temperature of the hollow shaft 4 also increases, making it easy for fine raw material powder to fuse to the surface of the end where the disc 2 is attached. Wings 11
Due to the high speed rotation of , outside air flows between the hollow shaft 4 and the raw material feed pipe 14 and between the disks 2 and 18, cooling the hollow shaft 4 and lowering the temperature, and the fine powder is fused to the surface of the above-mentioned part. It is also prevented that Another embodiment shown in FIG. 3 will be explained.

本実施例は第１図の遠心送風翼１１の代りに中心線Ａ−
Ａに対し傾斜面を有し原料送入管１４の端部の外周と僅
の隙間のあるようにした多数の軸流送風翼２７を具備す
るものである。In this embodiment, instead of the centrifugal blower blade 11 shown in FIG.
It is equipped with a large number of axial flow blower blades 27 which have an inclined surface relative to A and have a slight clearance from the outer periphery of the end of the raw material feed pipe 14.

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

第１図は本発明実施例の垂直断面図、第２図は第１図の
側面図、第３図は別の実施例の部分垂直断面図である。 １・・・・・・刃、２・・・・・・円板、４・・・・・
・中空軸、１１・・・・・・遠心送風翼、１３・・・・
・・原料供給シユート、１４．．．・・・原料送入管、
１７・・・・・・刃、１８・・・・・・円板、２２・・
・・・・軸受箱、２７・・・・・・軸流送風翼。FIG. 1 is a vertical sectional view of an embodiment of the present invention, FIG. 2 is a side view of FIG. 1, and FIG. 3 is a partial vertical sectional view of another embodiment. 1...Blade, 2...Disc, 4...
・Hollow shaft, 11...Centrifugal blower blade, 13...
...Raw material supply chute, 14. ．． ．． ...raw material feed pipe,
17...Blade, 18...Disc, 22...
...Bearing box, 27...Axial blower blade.

Claims (1)

【特許請求の範囲】 １ 僅かな間隙で向き合つていて共通の中心線Ａ−Ａ上
で互に反対の方向に高速回転する２個の円板＠２＠、＠
１８＠の相い対する円形面の外周に近い環状部分に夫々
半径方向の多数の刃１、１７を配列し、かつ一方の円板
＠２＠の刃１の刃先と他方の円板＠１８＠の刃１７の刃
先との間の前記の中心線Ａ−Ａに平行な方向の間隙が円
板＠２＠、＠１８＠の外周に向つて狭くなるようにして
ある円板式粉砕機に於て、前記の中心線Ａ−Ａのまわり
に回転する中空軸＠４＠の一方の円板＠２＠が結合され
ている端部の内面に取り付けられ、この中空軸４の中心
部に挿入された原料送入管１４の先端部との間に僅かの
間隙があり、空気出口側の縁りが前記の円板＠２＠と円
板＠１８＠との間の空間に接し、空気入口側の縁りがこ
の中空軸＠４＠の内径と原料送入管１４の外径との間の
細長い環状空間に接する多数の送風翼を有することを特
徴とする合成樹脂粉砕用円板式微粉砕機。 ２ 中空軸＠４＠の端部の内面に取り付けられた多数の
送風翼が遠心送風翼１１であることを特徴とする特許請
求の範囲第１項記載の合成樹脂粉砕用円板式微粉砕機。 ３ 中空軸＠４＠の端部の内面に取り付けられた多数の
送風翼が軸流送風翼２７であることを特徴とする特許請
求の範囲第１項記載の合成樹脂粉砕用円板式微粉砕機。[Claims] 1. Two disks facing each other with a small gap and rotating at high speed in opposite directions on a common center line A-A @2@, @
A large number of blades 1 and 17 are arranged in the radial direction on the annular portions near the outer peripheries of opposing circular surfaces of 18@, respectively, and the cutting edge of blade 1 of one disc @2@ and the other disc @18@ In a disc type crusher, the gap between the cutting edge of the blade 17 in the direction parallel to the center line A-A becomes narrower toward the outer periphery of the disc @2 @, @18 @. , attached to the inner surface of the end to which one disk @2@ of the hollow shaft @4 @ rotating around the center line A-A is inserted, and inserted into the center of this hollow shaft 4. There is a slight gap between the tip of the raw material feed pipe 14, the edge on the air outlet side touches the space between the disk @2@ and the disk @18@, and the edge on the air inlet side touches the space between the disk @2@ and the disk @18@. A disc-type fine pulverizer for pulverizing synthetic resins, characterized in that it has a large number of blower blades whose edges are in contact with the elongated annular space between the inner diameter of the hollow shaft @4@ and the outer diameter of the raw material feed pipe 14. 2. The disk-type fine pulverizer for crushing synthetic resins according to claim 1, wherein the large number of blower blades attached to the inner surface of the end of the hollow shaft @4@ are centrifugal blower blades 11. 3. A disk-type fine pulverizer for pulverizing synthetic resin according to claim 1, characterized in that the large number of blower blades attached to the inner surface of the end of the hollow shaft @4@ are axial flow blower blades 27. .