JP4012631B2

JP4012631B2 - 2-axis mixer

Info

Publication number: JP4012631B2
Application number: JP21363498A
Authority: JP
Inventors: 真康渡辺
Original assignee: 日工株式会社
Priority date: 1998-07-29
Filing date: 1998-07-29
Publication date: 2007-11-21
Anticipated expiration: 2018-07-29
Also published as: JP2000042391A

Description

【０００１】
【発明の属する技術分野】
本発明は、建築材料である骨材や建設工事に伴って発生する建設残土等を混合調整する二軸式ミキサに関する。
【０００２】
【従来の技術】
二軸式ミキサは二双の混合胴よりなる混練槽内に相反方向に回転する混練軸をそれぞれ平行に配設し、該混練軸にアームを放射状に配設すると共に、その先端部に混練羽根を取り付けた構造となっている。
【０００３】
そして、混合胴の内壁を混合羽根の回転軌跡の下半分に沿わせた構造のものについては、混合胴の中心を混合軸の軸心間の内側に偏心させたものがあるが、混合胴の内壁を混合羽根の回転軌跡の下方から上方近くまで沿わせたものにつては混合軸の軸心は混合胴の中心に一致させている場合が多い。
【０００４】
【発明が解決しようとする課題】
しかしながら、上記従来の二軸式ミキサのように、混合胴の内壁を混合羽根の回転軌跡の下方から上方近くまで沿わせると共に、混合軸の軸心を混合胴の中心に一致させているものでは、混合羽根の先端部と混合胴の内壁との間隙が一定であって、骨材や建設残土を混合する場合に、骨材や建設残土中の礫成分がその間隙に噛み込むと混合羽根がそれらを破砕したり、また噛み込んだまま強制的に回転させて衝撃や騒音を発生し、混合羽根や混合軸に過大な負担をかけることがある。
【０００５】
本発明は上記の点に鑑み、混合胴を混合羽根の回転軌跡の下方から上方近くまで沿わせた二軸ミキサにあって、材料の噛み込みを極力防止できるようにした二軸式ミキサを提供することを課題とする。
【０００６】
【課題を解決するための手段】
本発明は上記の課題を達成するために、略半円形状の二双の混合胴よりなる混合槽にそれぞれ混合軸を平行に配設し、該混合軸にアームを放射状に配設すると共に、該アームの先端に混合羽根を取り付けた二軸式ミキサにおいて、前記混合胴の内壁を混合羽根の回転軌跡の下方から上方近くまで沿わせると共に、混合胴の中心を混合軸の軸心間の内側にかつ下方に偏心させ、混合胴の内壁の最上部位置で内壁と混合羽根の先端部との間隙が最小となり、かつ混合羽根が回転するにつれて前記間隙を次第に広くするように構成したことを特徴とする。
【０００７】
【発明の実施の形態】
本発明に係る二軸式ミキサによれば、骨材や建設残土を混合するときに、混合胴と混合羽根との間隙に材料が噛み込もうとしても、混合羽根は回転するにつれて混合胴との間隙が次第に広がる方向に回転するために、噛み込もうとする材料はその間隙より逃げ、噛み込みが防止される。
【０００８】
【実施例】
以下、本発明の一実施例を図面に基づいて説明する。
【０００９】
二軸式ミキサは略半円形をした二双の混合胴１、１´より成る混合槽２を備え、前記混合胴１、１´にはそれぞれ混合軸３、３´を互いに平行に配設し、該混合軸３、３´にはアーム４を放射状に配設すると共に、該アーム４の先端部に材料を掻き上げる混合羽根５を取り付けている。
【００１０】
そして、混合胴１、１´の内壁６は、図３のように、混合羽根５の回転軌跡の下方から上方付近まで沿わせてある。また、混合胴１、１´の内壁の曲率半径Ｒの中心は混合羽根５先端の回転半径ｒの中心、即ち混合軸３、３´の軸心間の内側にａだけ偏心させると共に、その軸心間より下方にもｂだけ偏心させている。
【００１１】
この偏心によって、混合胴１、１´の内壁６のＰ１の位置で内壁６と混合羽根５の先端部との間隙が最小となり、またＰ２の位置で最大になり、混合羽根５が回転するにつれてその間隙が広がるようになっている。
【００１２】
したがって、骨材や建設残土を混合するときに、混合羽根５を混合胴１、１´の外側の材料を内側へと移動させるように回転させると、混合胴１、１´と混合羽根５との間隙に骨材や建設残土中の礫成分を噛み込んでも、混合羽根５が回転するにつれて混合羽根５の先端部と混合胴１、１´の内壁６との間隙が広がっていくので、噛み込んだ材料を逃がして噛み込みを防止でき、混合羽根５や混合軸３、３´に過大な負担をかけずに済む。
【００１３】
【発明の効果】
以上のように本発明に係る二軸式ミキサにあっては、混合胴の内壁を混合羽根の回転軌跡の下方から上方近くまで沿わせると共に、混合胴の中心を混合軸の軸心間の内側にかつ下方に偏心させ、混合胴の内壁の最上部位置で内壁と混合羽根の先端部との間隙が最小となり、かつ混合羽根が回転するにつれて前記間隙が次第に広くなるようにしたので、混合羽根と混合胴との間の材料の噛み込みを逃がし、混合羽根や混合軸に過大な負担をかけることを極力少なくできる。
【図面の簡単な説明】
【図１】本発明に係る二軸式ミキサの一実施例を示す縦断正面図である。
【図２】図１の縦断側面図である。
【図３】混合胴と混練軸の偏心状態を示す説明図である。
【符合の説明】
１、１´…混合胴２…混練槽
３、３´…混練軸５…混合羽根[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a twin-screw mixer that mixes and adjusts aggregates that are building materials and construction residual soil that is generated in connection with construction work.
[0002]
[Prior art]
The twin-screw mixer has kneading shafts rotating in opposite directions in parallel in a kneading tank composed of two and two mixing cylinders, and arms are radially arranged on the kneading shaft, and kneading blades are disposed at the tip thereof. It has a structure attached.
[0003]
And for the structure where the inner wall of the mixing cylinder is along the lower half of the rotation trajectory of the mixing blade, there is a structure in which the center of the mixing cylinder is eccentric to the inside between the axis of the mixing shaft. In many cases in which the inner wall extends from the lower side to the upper side of the rotation trajectory of the mixing blade, the axis of the mixing axis often coincides with the center of the mixing cylinder.
[0004]
[Problems to be solved by the invention]
However, as in the above-described conventional two-shaft mixer, the inner wall of the mixing cylinder runs along the rotation path of the mixing blade from the lower side to the upper side, and the axis of the mixing axis coincides with the center of the mixing cylinder. When the gap between the tip of the mixing blade and the inner wall of the mixing cylinder is constant and the aggregate or construction residual soil is mixed, if the gravel component in the aggregate or construction residual soil bites into the gap, the mixing blade They may be crushed or forcedly rotated while being bitten to generate impact and noise, which may place an excessive burden on the mixing blade and the mixing shaft.
[0005]
In view of the above points, the present invention provides a biaxial mixer in which a mixing cylinder is arranged from the lower side to the upper side of the rotation trajectory of the mixing blade, and can prevent the biting of the material as much as possible. The task is to do.
[0006]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention arranges the mixing axes in parallel in the mixing tanks composed of two semi-circular mixing cylinders, and arranges the arms radially on the mixing axes, In the biaxial mixer having a mixing blade attached to the tip of the arm, the inner wall of the mixing cylinder is caused to run from the lower side to the upper side of the rotation path of the mixing blade, and the center of the mixing cylinder is located between the center of the mixing shaft. and eccentrically downwardly, characterized in that the gap between the tip portion of the inner wall and the mixing blades at the top position of the inner wall of the mixing cylinder is minimized, and mixing blades are configured to progressively wider the gap as it rotates to And
[0007]
DETAILED DESCRIPTION OF THE INVENTION
According to the biaxial mixer according to the present invention, when mixing aggregate and construction residual soil, even if the material tries to bite into the gap between the mixing cylinder and the mixing blade, the mixing blade and the mixing cylinder are rotated as the mixing blade rotates. Since the gap rotates in the direction in which it gradually widens, the material to be bitten escapes from the gap and bite is prevented.
[0008]
【Example】
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0009]
The biaxial mixer has a mixing tank 2 composed of two semi-circular mixing cylinders 1 and 1 ', and mixing axes 3 and 3' are arranged in parallel to each other in the mixing cylinders 1 and 1 ', respectively. The mixing shafts 3, 3 ′ are provided with arms 4 arranged radially, and a mixing blade 5 for scraping material is attached to the tip of the arms 4.
[0010]
Then, the inner wall 6 of the mixing cylinder 1, 1 ′ extends from the lower side to the upper side of the rotation locus of the mixing blade 5 as shown in FIG. 3. The center of the radius of curvature R of the inner wall of the mixing cylinder 1, 1 ′ is decentered by a to the center of the rotation radius r of the tip of the mixing blade 5, that is, inside the mixing shafts 3, 3 ′. The distance b is also decentered below the center.
[0011]
Due to this eccentricity, the gap between the inner wall 6 and the tip of the mixing blade 5 is minimized at the position P1 of the inner wall 6 of the mixing cylinder 1, 1 ', and is maximized at the position P2, and as the mixing blade 5 rotates. The gap is widened.
[0012]
Therefore, when mixing the aggregate and construction residual soil, if the mixing blade 5 is rotated so as to move the material outside the mixing cylinder 1, 1 ′ to the inside, the mixing cylinder 1, 1 ′ and the mixing blade 5 Even if the gravel component in the aggregate or the construction residual soil is caught in the gap, the gap between the tip of the mixing blade 5 and the inner wall 6 of the mixing cylinder 1, 1 ′ increases as the mixing blade 5 rotates. The entrained material can be released to prevent biting, and it is not necessary to place an excessive burden on the mixing blade 5 and the mixing shafts 3 and 3 '.
[0013]
【The invention's effect】
As described above, in the biaxial mixer according to the present invention, the inner wall of the mixing cylinder is caused to run from the lower side to the upper side of the rotation trajectory of the mixing blade, and the center of the mixing cylinder is located between the shaft centers of the mixing shafts. It is decentered downwardly and the gap between the tip portion of the inner wall and the mixing blades at the top position of the inner wall of the mixing cylinder is minimized, and since the mixing vanes is to the gap as it rotates gradually becomes wider, mixing blades It is possible to reduce the biting of the material between the mixing cylinder and the mixing cylinder and to put an excessive burden on the mixing blade and the mixing shaft as much as possible.
[Brief description of the drawings]
FIG. 1 is a longitudinal front view showing an embodiment of a biaxial mixer according to the present invention.
2 is a longitudinal side view of FIG. 1. FIG.
FIG. 3 is an explanatory view showing an eccentric state of a mixing cylinder and a kneading shaft.
[Explanation of sign]
DESCRIPTION OF SYMBOLS 1, 1 '... Mixing cylinder 2 ... Kneading tank 3, 3' ... Kneading shaft 5 ... Mixing blade

Claims

Two shafts in which mixing axes are arranged in parallel in mixing tanks composed of two semi-circular mixing cylinders, arms are arranged radially on the mixing shaft, and mixing blades are attached to the tips of the arms. In the mixer, the inner wall of the mixing cylinder is caused to extend along the rotation path of the mixing blade from the lower side to the upper side, and the center of the mixing cylinder is decentered inward and downward between the shaft axes of the mixing shaft . twin screw mixer, wherein a gap between the tip portion of the inner wall and the mixing blades at the top position is minimized, and mixing blades are configured to progressively wider the gap as it rotates.