JP2010099553A - Planetary mixer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a planetary mixer constituted so as not only to shorten a treatment time but also to well perform stirring-kneading without producing adhesion residues on the inner surface of a tank in a manufacturing step of ink, coating, ceramic, chemicals, food, an electronic material and various other products. <P>SOLUTION: A plurality of frame-shaped stirring blades 3 subjected to planetary motion in a tank 2 so as to set the directions of revolution-rotation to opposite directions are provided. The planar single-sided cross section of each of the stirring blades is formed into an almost hexagonal cross-sectional shape and the width (d) of the planar single-sided cross section is formed to 0.145-0.3, preferably 0.15-0.25 with respect to the diameter D of each of the stirring blades. Further, the width (b) of the edge part of the planar single-sided cross section of each of the stirring blades is 4-15%, preferably 6-12% of the thickness W of the planar single-sided cross section of each of the stirring blades and the thickness W of each of the stirring blades is set to 0.2±0.05 with respect to the diameter D of each of the stirring blades. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention disperses, stirs, kneads, and disperses materials from low viscosity to high viscosity (up to 3000 Pa · s) or semi-solid materials such as inks, paints, ceramics, chemicals, foods, electronic materials and other various industrial materials. More particularly, the present invention relates to a planetary mixer in which stirring blades are revolved and rotated in a stirring tank (tank) for processing.

As a kneading type disperser / kneader, conventionally, it has three stirring blades that revolve and rotate in a tank (planetary motion), and the rotational direction of this revolution and rotation is reversed, and a strong shearing force is applied to the processing material. A planetary mixer that can be dispersed, stirred, kneaded, kneaded, etc. is widely used (see, for example, Patent Document 1). However, since the conventional planetary mixer is processed mainly with shearing force, it may not be processed in a satisfactory state. For example, a mixed powder in which large particles and small particles are mixed easily causes aggregation, which may cause a problem in terms of power. Furthermore, it is well known that sufficient kneading (kneading) is insufficient, processing time is required, and the undispersed layer remains on the inner wall surface and bottom of the tank.
JP 2006-192385 A (paragraph 0011, FIG. 2)

  The problem to be solved by the present invention is that when performing the above-described dispersion, stirring, kneading, etc., a high-viscosity or semi-solid kneading (hard kneading) is performed so that there is no residue on the inner wall surface or bottom surface of the tank. It is an object of the present invention to provide a planetary mixer that can be kneaded, can be pulverized to agglomerated particles of powder and granules, and can further reduce the kneading and kneading time.

  In order to solve the above problems, a planetary mixer having a frame-type stirring blade whose revolving and rotating directions are reversed in a conventional tank was examined. In the conventional stirring blade, the processing material moved in the tangential direction. Some of the amount was small and the kneading effect was insufficient. Conventionally used as a frame-type stirring blade for a planetary mixer is a straight frame-type stirring blade with both ends connected by straight vertical sides and the angle between the upper side and the lower side is 0 degrees, or the upper side and the lower side. A frame-type twisted stirring blade having a shape in which the vertical side portion is twisted in the circumferential direction so that the portion is shifted by 45 degrees or 90 degrees in the circumferential direction is known. The cross-sectional shape of the vertical side part is as follows: a side extending in parallel outward from both sides of the base side, an inclined side extending inclined from the tip of the side, and an edge side connecting the tip of the inclined side It is often formed in a substantially cross-sectional hexagon having The width d from the base side to the edge side of the vertical side portion (the width of the plane piece cross section) d is set to a relatively narrow width of 0.09 to 0,144 with respect to the diameter D of the frame type stirring blade. Therefore, it has been found that the amount of movement of the processing material is reduced. On the other hand, when the ratio of the width d to the diameter D is 0.25 or more, particularly 0.3 or more, the amount of movement of the material in the tangential direction increases, and the phenomenon of rotation occurs, and the stirring and kneading action is reliably performed. It was difficult and the processing time tended to increase.

  Therefore, according to the present invention, a plurality of frame-shaped stirring blades having a diameter D in which both ends of the upper side portion and the lower side portion communicating with the drive shaft are connected by the vertical side portions are provided, and the frame-type stirring blades are disposed in the stirring tank (tank). In the planetary mixer in which the rotational direction of revolution and rotation is reversed and the planetary mixer is used to stir and knead the processing material, the cross-sectional shape of the vertical side of the frame-type stirring blade is outside from both sides of the base side. A hexagonal cross section having a side extending in parallel toward the direction, an inclined side extending inclined from the tip of the side, and an edge side connecting the tip of the inclined side, and from the base of the vertical side The width to the edge side (the width of the plane piece cross section) d is 0.145 to 0.3, preferably 0.15 to 0.25, with respect to the diameter D of the stirring blade. A planetary mixer is provided, which can solve the above-mentioned problems

  Furthermore, if the planar one-side cross-sectional shape that is the vertical side portion of the stirring blade is not the substantially cross-sectional hexagon as described above, but the cross-sectional square shape as shown in FIG. The effect of feeding the material between the tank and the tank surface is not expected. And in order to improve the biting of the material, it is necessary to increase the clearance between the stirring blade and the inner surface of the tank, but if so configured, the shearing force (slipping) action becomes insufficient, resulting in the kneading effect. Decreases.

  Further, in the planetary mixer having a stirring blade having a substantially hexagonal cross section, the width b of the edge side of the frame-type stirring blade closest to the inner surface of the stirring tank (tank) is set to the thickness of the base (the stirring blade). When the thickness is less than 4% of W, when the edge side is closest to the inner surface of the agitation tank (tank), it becomes close to line contact, and almost no compression / expansion action in the material flow direction is observed. A homogeneous kneading takes time and is not preferable. On the other hand, when the width b is 16% or more, the area close to the tank inner surface increases and the shearing force (slip) stress increases, but the energy of heat generation and load power increases and kneading is not preferable.

  Therefore, according to the present invention, in the planetary mixer, the width b of the edge side of the frame-type stirring blade closest to the inner surface of the stirring tank (tank) is set to the thickness of the base (stirring). The above-mentioned planetary mixer having a thickness of 4 to 15%, preferably 6 to 12% of the blade thickness W is provided to solve the above-mentioned problems. With this configuration, the material bites between the edge portion and the tank inner surface, the kneading time can be shortened, and the material density is improved due to defoaming due to the compression effect.

  Furthermore, the forward angle (material biting angle) and backward angle (negative pressure angle) of the above-mentioned inclined side and the included angle (edge angle) between the inclined sides are also a problem. The shearing force (displacement) effect generated between the tank wall surface and the tank wall surface is reduced. Further, when the angle is 100 ° or more, the biting of the processing material between the tank wall surfaces becomes less, so that the kneading / dilution time becomes longer, which is not preferable.

  Therefore, according to the present invention, in the planetary mixer, the front side (material biting angle) and the rear angle (negative pressure) of the inclined side and the tank inner surface forming the edge part of the vertical side part (plane one side cross section) of the stirring blade. The above planetary mixer is provided in which the angle) is set to 40 to 50 °, and at the same time, the included angle (edge angle) between the inclined sides is set to 80 to 100 °, preferably 85 to 90 °. . When the edge angle is set to such an angle, the processing material is efficiently swallowed between the edge side and the tank inner surface, and the compression and expansion are effectively repeated in the flow direction of the material, so that the processing can be performed in a short time. .

  Conventionally, in the case of a highly viscous material or a dilatant material, contact between the stirring blades and contact between the stirring blade and the inner wall of the stirring tank (tank) are observed during the stirring and kneading treatment. It is made of a hazardous material treatment material containing an organic solvent and the like, and the stirring blade is also formed in a structure with increased strength. For example, a structure in which the vertical side portions on the upper side portion and the lower side portion side are tapered to increase rigidity, or the cross-sectional shape is changed to prevent contact is also known. Conventionally, in such a case, the thickness of the base (the thickness of the stirring blade) W is 0.12 ± 0.03 (0.117 to 0.123) with respect to the diameter D of the stirring blade. However, contact between the stirring blades and contact between the stirring blades and the inner wall of the stirring tank (tank) are still observed.

  Corresponding to such a case, according to the present invention, in the planetary mixer, the thickness (base thickness) W of the stirring blade is 0.2 ± 0.05 with respect to the diameter D of the stirring blade. The planetary mixer having a thickness of 5 mm is provided to solve the above-mentioned problems.

  The present invention is configured as described above, and the width of one side cross section of the frame type stirring blade, that is, the width d from the base side to the edge side of the vertical side portion is 0.145 to 0.3 with respect to the diameter D of the stirring blade. The width of the material is preferably 0.15 to 0.25, so that it is possible to increase the moving amount of the processing material in the tangential direction without causing a phenomenon of rotation, and the material is pushed into the tank wall. It is possible to effectively squeeze and knead a strong buckwheat flour by the compression action that occurs between the stirring blades in the center of the tank, and it is about 1/2 or less compared to the conventional processing time. Was able to save time.

  Further, the planetary mixer of the present invention is configured as described above, and the width b of the edge side of the frame-type stirring blade closest to the inner surface of the stirring tank (tank) is set to the thickness W of the base side by the mechanical capacity. 4 to 15%, preferably 6 to 12%, the material can penetrate between the tank inner surfaces, the kneading time can be shortened, and the material density is improved due to defoaming by the compression effect. It was seen.

  Further, in the above planetary mixer, since the stirring tank (tank) is circular, the front angle and the rear angle of the inclined side of the stirring blade are 45 ° microscopically, and the edge angle is 80 to 100 °, preferably 85 to 90 °. When formed at °, the locus when the rotation ratio of the rotor (rotary box) and the rotation speed of the stirring blade was about 1: 3 was able to produce a successful kneading kneading like a strong buckwheat flour. . According to the present invention, by setting the cross-sectional shape of the frame-type stirring blade as described above, the solid / liquid processing material is kneaded (kneaded) in a high-viscosity or semi-solid state, and the forward angle of the stirring blade By compressing / expanding at the (material biting angle) and backward angle (negative pressure), powder and granules can be coated with a small amount of liquid components, allowing easy dilution, improving kneading and dilution, and reducing time. I was able to.

  Furthermore, according to the present invention, as described above, the thickness of the base (thickness of the stirring blade) W is 0.2 ± 0.05 (0.15 to 0.25) with respect to the diameter D of the stirring blade. ), The strength was increased, the agitation blades were not in contact with each other, and no contamination was caused by the contact, and good kneading and kneading results were obtained.

  The present invention can be used in the manufacturing process of inks, paints, ceramics, chemicals, foods, electronic materials and other various products, and as a frame type stirring blade, there is no deviation of the angle between the upper side and the lower side. Although the present invention can be applied to a straight frame-type stirring blade having a vertical side portion that is straight, the frame-type torsion stirring blade in which the vertical side portion is twisted in the circumferential direction is shown. ing.

  As shown in FIG. 1, the main body 1 of the planetary mixer has three stirring blades (blades) 3 inserted into a stirring tank (tank) 2, and each stirring blade is a motor 4 or a planet as known in the art. Planetary motion is made so that the direction of revolution and rotation in the tank is reversed through the gear mechanism.

  The stirring blade 3 is formed in the frame-type twisted shape having a diameter D in which both sides of an upper side portion 6 communicating with the drive shaft 5 and a lower side portion 7 positioned below are connected by a longitudinal side portion 8 twisted in the circumferential direction. The vertical side portion 8 is twisted in the circumferential direction so that the upper side portion 6 and the lower side portion 7 are positioned 45 ° or 90 ° apart from each other. And the shape of the plane one side cross-section of the stirring blade, that is, the cross-sectional shape of the vertical side portion 8 is inclined from the side 10 extending in parallel outward from both sides of the base 9 and the tip of the side 10. The inclined side 11 extending in this manner and the edge side 12 connecting the tip of the inclined side 11 are formed in a substantially hexagonal cross section. The width d from the base side 9 to the edge side 12 of the vertical side part (the width of the plane piece cross section) is 0.145 to 0.3, preferably 0.15 with respect to the diameter D of the stirring blade. It is formed to have a width of ˜0.25.

  The width b of the edge side 12 is 4 to 15%, preferably 6 to 12% of the thickness (the thickness of the stirring blade) W of the base side 9. As shown in FIG. 5, the included angle (edge angle) θ of the inclined side 11 is 80 to 100 °, preferably 85 to 90 °. As shown in FIG. 5, the front angle (material biting angle) θ1 and the rear The angle (negative pressure angle) θ2 is formed to be 40 to 50 °. Further, the thickness 9 of the base 9 (thickness of the stirring blade) W is formed to a thickness of 0.2 ± 0.05 with respect to the diameter D of the stirring blade 3.

  When stirring blades (Examples 1 and 2) having a cross-sectional shape corresponding to the above numerical range were formed and compared with those having shapes outside the range (Comparative Examples 1 to 3), the following results were obtained.

  As described above, according to the examples of the present invention, uniform agitation and kneading can be performed without causing residue on the inner surface of the tank, and good results were obtained in a shorter time than before.

The front view which showed one Example of this invention and was partially cut. Explanatory drawing which shows the relationship between a stirring blade and a tank. The top view of a stirring blade. The front view of a stirring blade and sectional drawing of a vertical side part. Explanatory drawing which shows the relationship between an edge part and a tank inner surface. The assumption reference figure which shows the relationship between the edge part and tank inner surface in case the planar one side cross-sectional shape of a stirring blade is made into a square.

Explanation of symbols

1 Body 2 Mixing tank (tank)
3 Stirring blade 6 Upper side portion 7 Lower side portion 8 Vertical side portion 9 Base side 10 Side side 11 Inclined side 12 Edge side

Claims (7)

  There are a plurality of frame-type stirring blades having a diameter D in which both ends of the upper side and the lower side connected to the drive shaft are connected by vertical sides, and the rotation direction of rotation and rotation of the frame-type stirring blades in a stirring tank (tank) In a planetary mixer in which the processing material is stirred and kneaded by moving the planet in the reverse direction, the cross-sectional shape of the vertical side of the frame-type stirring blade is parallel to the outside from both sides of the base side. It has a substantially hexagonal cross section having an extending side, an inclined side extending obliquely from the tip of the side, and an edge side connecting the tip of the inclined side, and a width (plane) from the base side to the edge side of the vertical side portion A planetary mixer characterized in that the width (d) of one side cross-section is formed to a width of 0.145 to 0.3 with respect to the diameter D of the stirring blade.   There are a plurality of frame-type stirring blades having a diameter D in which both ends of the upper side and the lower side connected to the drive shaft are connected by vertical sides, and the rotation direction of rotation and rotation of the frame-type stirring blades in a stirring tank (tank) In a planetary mixer in which the processing material is stirred and kneaded by moving the planet in the reverse direction, the cross-sectional shape of the vertical side of the frame-type stirring blade is parallel to the outside from both sides of the base side. It has a substantially sectional hexagonal shape having an extending side, an inclined side extending obliquely from the tip of the side, and an edge side connecting the tip of the inclined side, and a width (plane) from the base side to the edge side of the vertical side portion. A planetary mixer characterized in that the width (d) of one side cross-section is formed to a width of 0.15 to 0.25 with respect to the diameter D of the stirring blade.   3. The planetar according to claim 1, wherein the width b of the edge side closest to the inner surface of the stirring tank (tank) is 4 to 15% of the thickness (thickness of the stirring blade) W of the base side. Lee mixer.   3. The planetar according to claim 1, wherein the width b of the edge side closest to the inner surface of the stirring tank (tank) is 6 to 12% of the thickness (thickness of the stirring blade) W of the base side. Lee mixer.   The forward angle (material biting angle) and backward angle (negative pressure angle) of the inclined side with respect to the inner surface of the stirring tank (tank) are 40 to 50 °, and the included angle (edge angle) between the inclined sides is 80 to 100 °. The planetary mixer according to any one of claims 1 to 4.   The front angle (material biting angle) and the rear angle (negative pressure angle) of the inclined side with respect to the inner surface of the stirring tank (tank) are 40 to 50 °, and the included angle (edge angle) between the inclined sides is 85 to 90 °. The planetary mixer according to any one of claims 1 to 4.   The planetary mixer according to any one of claims 1 to 6, wherein the base thickness (thickness of the stirring blade) W is 0.2 ± 0.05 with respect to the diameter D of the stirring blade. .

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