JP3204793U - Planetary mixer - Google Patents

Abstract

A planetary mixer used in the manufacturing process of various products such as chemical, medical, electronic, ceramics, chemicals, food, feed and the like. When mixing, kneading, kneading, or the like of the processing material, the material is prevented from adhering to and sticking to both corners of the bottom side of the frame-type blade and the bottom corner of the tank. A frame type blade has a vertical side portion extending linearly along an inner surface of a tank and a bottom side portion extending linearly along a bottom surface. The vertical side portion 9 and the bottom side portion 10 are connected in an orthogonal state at a position close to the bottom corner portion of the tank 7, and both end corner portions 15 of the connecting portion are formed into curved surfaces. The entire circumference of the bottom corner 14 of the tank 7 is also curved. When the blade 6 rotates, the processing material flows without stagnation even in the vicinity of the corners of the bottom surface, and adhesion and adhesion to the tank and the blade are prevented. [Selection] Figure 4

Description

  The present invention is used in various fields such as chemistry, medicine, electronics, ceramics, food, feed, etc., and by making planetary movement of two or three frame type blades throughout the tank (container, stirring tank), The present invention relates to a planetary mixer in which a solid / liquid processing material can be mixed, kneaded, kneaded, dispersed, and the like.

  Operations such as mixing, kneading, kneading, and dispersion treatment of processing materials of low to high viscosity (up to 3,000 Pa · s), not limited to solid / liquid oily and aqueous, are performed by a twin screw mixer (for example, a frame type blade) 2), a triaxial mixer (for example, a mixer having three frame type blades, a mixer in which two frame type blades are combined with one turbine blade, etc.), a four axis mixer (for example, a frame type blade and a turbine blade) In many cases, a plurality of other frame-type blades are revolved and rotated so that they move throughout the tank, and processed in a batch (batch) system (for example, Patent Document 1, 2).

  The kneading action by the frame-type blade is dispersed by applying shear stress (shear stress) to the processing material that has flowed between the inner wall of the tank due to the rotation of the blade. This process is similar to the action of a roll mill. ing. That is, when the edge formed outside the vertical side of the frame-type blade is close to the tank inner wall, the processing material that has entered between the tank inner wall is compressed between the edge and the tank inner wall, and then the blade The process material existing between the tank inner walls is sheared by the shear stress generated by the rotation of the tank, and finally the process material is released and expands when the edge part moves away from the tank inner wall. , Compression, shearing, release, and expansion.

  The frame-type blade and the tank are variously configured according to the purpose. For example, in the planetary mixer disclosed in Patent Document 2, the frame body of the frame-type blade has a linear shape above the vertical side and a bottom at the bottom. The curved portion is formed in a lower half arc shape that is connected in series to the bottom portion of the semicircular arc shape, and a plate-like stirring tool is provided in the frame. The tank has a cylindrical side wall and has a bottom surface curved in a substantially bowl shape corresponding to the bottom side of the frame. The bottom of this tank looks like a cross section of a twin-kneader kneader trough when viewed in cross-section, but in the case of a kneader, the trough is formed in a substantially box shape and the blade shaft of the kneader is on the bottom of the trough. Along the horizontal direction, and the rotation of the blades rotates so that the processing material flows toward the large arcuate surface at the bottom of the tank, so that the processing material between the curved surface of the tank and the blades, similar to the action of a roll mill. Can be compressed, sheared, and released to efficiently knead a processing material having a high viscosity. On the other hand, in the case of a blade of a planetary mixer, the blade shaft extends in a direction substantially perpendicular to the bottom surface of the tank and rotates in the circumferential direction of the tank, so that the curved portion of the blade is processed along the large curved surface of the bottom surface of the tank. Since the shearing force applied from the curved portion is not easily transmitted to the material, the shearing force per unit area is not large. Therefore, as described in Patent Document 2, if a large curved portion is formed at the bottom of the blade and the corner of the tank, it is difficult to disperse the processing material by applying a strong shearing action over the entire tank. Often used for the purpose of stirring and mixing low viscosity treatment materials.

  On the other hand, in the planetary mixer described in Patent Document 1, a flat bottom plate is provided on a tank having a cylindrical side wall to form a bottom corner of the tank at a right angle, and the frame-type blade is formed along the side wall of the tank. It has a straight vertical side that extends and a straight bottom that extends along the bottom plate of the tank and is connected perpendicularly to the lower part. In this case, when the frame type blade rotates, the edge surface formed on the outer side surface of the vertical side portion moves close to the inner wall of the tank, so that the processing material is between the edge surface of the vertical side portion and the inner wall of the tank. Dispersion treatment is performed by applying shear stress to the processing material that has entered the space between the bottom and the bottom of the tank as the blade rotates and revolves between the bottom and the bottom of the tank. In addition, it is possible to efficiently knead the processing material having a high viscosity throughout the tank. In the case of a batch type, such a dispersing action is a kneading machine in which the frame-type blade has a planetary motion trajectory because the opportunity to apply shear stress to the material is discontinuous between the frame-type blade and the inner wall of the tank (stirring tank). Then, it is twice each time the frame type blade rotates once.

  As described above, in order to achieve a sufficient kneading action as a whole tank between the tank inner surface and the tank bottom surface, as shown in Patent Document 1, the blade has a straight vertical side close to the tank bottom surface. It is preferable that the intersection of the vertical side portion and the bottom side portion is formed at a right angle, and accordingly the corner portion of the bottom surface of the tank is also formed at a right angle. However, in such a configuration, the fluidity is not good near the right corner of the bottom of the tank, so the shear rate and shear stress are non-uniform, and the processing material tends to gather at the corner, etc. The powder and the processing material at the time of kneading may adhere to this corner | angular part, or may adhere. In particular, when a high-viscosity treatment material or the like is strongly kneaded, the material is often attached to the bottom corners of the tank T and the bottom side of the blade B (see FIG. 5A). It was necessary to suspend the process and scrape off the deposit C. If the kneading operation is continued without scraping off, it tends to cause bumps and lumps (partial agglomeration of powder) in the dilution process after kneading, and it causes poor quality due to contamination of lumps and lumps during dilution. There was a thing.

  In this way, if material adheres to and adheres to both corners of the bottom of the frame-type blade and the bottom corner of the tank, it is necessary to interrupt the kneading operation and scrape the deposits from the bottom of the inner surface of the blade or tank. However, this scraping work is dangerous. In particular, the material that adheres to and adheres to the bottom corner of the tank is difficult and troublesome work by hand, and it is easy to cause lumps and lumps. In addition, since such scraping work must be performed with the kneading work interrupted, the kneading work cannot be continued, and the tank cannot be completely sealed along with the work interruption. When a volatile organic solvent is used in the kneading operation, there is a risk of causing environmental pollution.

Japanese Patent Laid-Open No. 9-267032 (drawing) JP 2000-271464 A (FIG. 1)

  The problem to be solved by the present invention is that, as described above, in a tank having corners formed on the entire circumference of the bottom surface, a frame-type blade having a substantially straight vertical side and a bottom side is moved in a planetary motion, and the vertical side and the inner surface of the tank are In a planetary mixer that performs processing such as mixing, kneading, kneading, and dispersing by applying shearing stress to the processing material between the bottom and the bottom of the tank, the bottom corner of the tank and the bottom of the blade are likely to adhere to the material. This prevents the material from adhering to and sticking to the corners at both ends of the part, eliminating the need for scraping during work, improving safety, shortening the processing time for kneading, kneading, etc. It is to provide an improved planetary mixer.

  In view of the above circumstances, an object of the present invention is to provide a planetary mixer capable of applying a uniform shear stress to a processing material at a uniform shear rate over the entire circumference of the bottom corner of the tank. That is, according to the present invention, a planetary mixer that disperses, mixes, and kneads a solid / liquid processing material with a plurality of frame-type blades that rotate and revolve in a tank having a flat bottom surface and a cylindrical inner surface. The frame type blade has a vertical side portion extending linearly along the inner side surface of the tank and a bottom side portion extending linearly along the bottom surface of the tank, and the vertical side portion and the bottom side portion are the bottom surface angles of the tank. It is connected in an orthogonal state at a position close to the portion, and a curved surface is formed on the entire circumference of both end corners of the tip of the connecting portion and the bottom corner of the tank so that the distance between them is constant. A planetary mixer can be provided to solve the above problems.

  Further, according to the present invention, a narrow edge portion is formed on the outer side surface of the vertical side portion of the frame type blade, and the radius of the curved surface of the bottom corner portion of the tank is about 2 to 4 times the edge width. The planetary mixer is preferably formed with a radius of about 2 mm (2R) to 15 mm (15R), and more preferably with a radius of about 3 mm (3R) to 10 mm (10R).

  The present invention is configured as described above, and is a planetary that disperses, mixes, and kneads a solid / liquid processing material by a plurality of frame-type blades that rotate and revolve in a tank having a flat bottom surface and a cylindrical inner surface. In the Lee mixer, the frame-type blade has a vertical side portion extending linearly along the inner side surface of the tank and a bottom side portion extending linearly along the bottom surface of the tank, and the vertical side portion and the bottom side portion are formed in the tank. Since it is connected in an orthogonal state at a position close to the bottom corner, and a curved surface is formed on both ends of the tip of the connecting portion and the entire corner of the bottom corner of the tank so that the distance between them is constant. When the frame-type blade revolves and rotates, the edge of the frame-type blade that is formed on the outer surface of the frame blade rotates close to the inner surface of the tank, and the material that flows between the inner surface of the tank is the edge surface. And sent between the inner surface of the tank and compressed At the same time, mixing, kneading, and the like are performed by shear stress (shear stress) accompanying rotation, and then the vertical side portion is expanded from the inner surface of the tank. On the other hand, the material that has entered between the bottom side and the bottom of the tank is kneaded and mixed in substantially the same manner. Such a kneading action is performed for the entire tank over almost the entire length of the vertical and bottom sides, but the distance between the corners of the bottom side of the blade is constant on the entire circumference of the bottom corner of the tank. Since the curved surface is formed, the fluidity of the bottom corner of the tank is not hindered, and uniform shear stress can be applied to the processing material at a uniform shear rate over the entire circumference. There is no risk of material adhering to or sticking to. Therefore, there is no need for the work of sticking and sticking off the adherents in the middle of the work from the bottom corners of the tank or the frame-type blade as in the prior art. The problem of mixing into the paste is also eliminated, and it is possible to produce a paste having excellent characteristics free from lumps and lumps in a short time, which can greatly improve the work. In addition, since there is no need to scrape off during processing such as mixing and kneading, the operation can be continued with the tank sealed, and even with materials containing volatile organic matter, there is a problem of environmental pollution. Therefore, fluidity can be improved even when diluted, and uniformization can be achieved at an early stage.

  In this case, when the curvature of the curved surface of the bottom corner of the tank is about 2 mm (2R) to 15 mm (15R), preferably about 3 mm (3R) to 10 mm (10R), the kneading operation can be performed efficiently. That is, when it is formed to be less than 2 mm, the corner of the bottom surface of the tank is almost perpendicular, and the shear stress is difficult to reach to the inside of the corner, and the kneaded material may be locally attached and fixed. In addition, if the curved surface is considered to be a part of the circular arc, the length of the arc of the curved surface at the bottom corner is a quarter of the entire circumference of the circle whose radius is the curvature of the curved surface. Beyond 15 mm, the proximate surface extends a considerable length. For this reason, the edge formed on the outer surface of the blade has insufficient shear stress per unit area acting on the material gathered at the bottom corner of the tank, leading to insufficient kneading and dispersion, and mixing of lumps into the treated material May be seen, which is not preferable in terms of quality.

  Further, according to the experiment, as shown in FIG. 5A described above, the bottom corner of the tank must be provided with no curved surface at both the corners of the bottom of the frame-type blade and the corner of the bottom of the tank. If the material is easy to adhere to and adhere to, and the curved surface is provided only on the blade side (Fig. B), the adhesion is seen on the bottom corner of the tank, and the curved surface is provided only on the bottom corner of the tank. In FIG. 6C, a phenomenon was observed in which the material adhered and adhered to the frame type blade. In any case, the distance between both ends of the bottom of the frame-type blade and the bottom corner of the tank changes, and it is impossible to apply a uniform shear stress to the material at a uniform shear rate. It is thought that sticking occurred. On the other hand, as shown in FIG. 4, when a small curved surface is formed at both corners of the bottom of the frame blade and the bottom corner of the tank, the distance between the two becomes constant and uniform at a uniform shear rate. Shear stress could be applied to the material, and as a result, no adhesion or sticking of the material was observed on the blade or tank, and good results were obtained.

The front view which cut down a part of planetary mixer. Explanatory drawing which shows the relationship between a frame type | mold blade and a tank. The front view which shows one Example of the frame type | mold blade of this invention. Explanatory drawing which shows a part of tank and braid | blade of this invention. The relationship between the blade and the bottom corner of the tank is shown (A) when no curved surface is provided at any corner, (B) when the curved surface is provided only on the blade side, (C) is the bottom corner of the tank Each explanatory view in the case of providing a curved surface only on the side.

  The present invention can be used in the manufacturing process of chemical, pharmaceutical, electronic, ceramics, food, feed and other various products. The main body 1 of the planetary mixer is a stirring head 3 that moves up and down by a lifting cylinder 2, or a stirring head. And a plurality of agitation shafts 5 are revolved via driving means 4 such as a driving motor provided on the agitation head. The frame-type blade 6 that rotates and is attached to the lower end of the stirring shaft 5 is configured to make a planetary motion in the tank 7 as a whole. This frame-type blade 6 has an upper side 8 that communicates with the stirring shaft 5, a vertical side 9 that communicates with the upper side, and a bottom 10 that communicates with the lower end of the vertical side in an orthogonal state. It is formed in a rectangular frame shape, and the frame type blade as shown in FIG. 2 in which the upper side 8 and the bottom side 10 face the same direction, or the direction of the upper side 8 and the bottom side 10 is a predetermined angle, for example, 45 °, 90 ° A different frame-type twist blade is used as shown in FIG. 3, and in the embodiment shown in FIG. 1, a frame-type twist blade is shown.

  As shown in FIG. 2, the tank 7 is formed in a cylindrical body having a flat bottom surface 11 and a cylindrical inner surface 12, and the size thereof is, for example, from a small one having a capacity of about 0.2L. Various sizes are prepared up to a large size of about 3400L.

  The vertical side portion 9 of the frame type blade 6 is formed linearly along the inner side surface 12 of the tank 7, but in the case of a twisted blade, it extends along the inner side surface of the tank while twisting downward, Is formed with a narrow edge portion 13. A bottom portion 10 communicating with both lower ends of the vertical side portion 9 is formed linearly along the bottom surface 11 of the tank 7. The width of the edge portion 13 is usually about 2 mm to 6.5 mm, although there is a relationship between the size of the tank and the required power.

  The bottom corner 14 of the tank 7 and the end corner 15 which is the tip of the connecting portion where the vertical side 9 and the bottom 10 of the frame-shaped blade 6 communicate with each other flow into the entire corner of the bottom corner of the tank. A small curved surface is formed so that a sufficient shearing force can be applied to the material from the edge portion of the blade. When the curvature radius of the curved surface is about 2 mm (2R) to 15 mm (15R), preferably about 3 mm (3R) to 10 mm (10R), uniform shear stress can be given to the material, and good results are obtained. It was. Also, according to experiments, good results can be obtained when the curvature is formed to be large in proportion to the size of the edge width of the edge portion 13 of the blade 6 and is about 2 to 4 times, preferably about 3 times the edge width. It has also been found that it is best to have a radius of curvature. It should be noted that the radius of curvature of the curved surface formed at both end corners 15 of the bottom side of the blade 6 and the bottom corner 14 of the tank 7 may be the same size, but the curved surface provided in the tank according to the driving force of the blade and the blade The curvature of the curved surface provided at both ends can be changed as appropriate, for example, the curvature radius on the tank side can be made larger than the curvature radius on the blade side.

  Planetary mixers are used in various applications as described above. In general, processing materials are so-called “powder mixed” at the time of supplying the materials, and then a small amount of liquid components are added to the powders and granules. The surface treatment of the granules is performed. This step is powder mixing, in which activated powders and granules are inactivated and aggregation is crushed. In the next step, a further small amount of liquid component is added and kneaded by a high shearing action with high viscosity, finally diluted and taken out as a paste. The shear stress is represented by the product of the material viscosity and the shear rate, and it is known that kneading at a high viscosity can provide high shearing. Therefore, kneading is preferably performed as described above.

  The material is kneaded with a planetary mixer as described above, but the rotational speed is about 0.5 to 1.5 m / sec and the temperature is about 60 ° C. or less so that the paste does not deteriorate due to heat generation during kneading. It is preferable to operate under the following conditions. This is because if it is 1.5 m / sec or more, heat generation increases and it is difficult to keep the material temperature at 60 ° C. or less in terms of material characteristics.

  The process from preparation of powder of the above materials to dilution paste is processed by using the frame type blade and tank of the present invention in a three-axis planetary mixer with a tank capacity of 15 liters manufactured by Inoue Manufacturing Co., Ltd. As a result, even in the vicinity of the bottom corner of the tank, a uniform shear stress was given to the material at a uniform shear rate to obtain a paste free of lumps and lumps, and it was possible to efficiently disperse, mix, knead, knead, etc. . In addition, the material flows without causing stagnation along both the corners of the curved blade and the corners of the tank bottom, and due to this flow deformation, the material adheres to the inner surface of the blade and the corners of the tank bottom as in the prior art. There was no sticking and manual scraping work was unnecessary.

6 Frame type blade 7 Tank 9 Vertical side portion 10 Bottom side portion 11 Bottom surface 12 Inner side surface 13 Edge portion 14 Bottom corner portion 15 of the tank

Claims (2)

  In a planetary mixer that disperses, mixes, and kneads a solid / liquid processing material with a plurality of frame-type blades that rotate and revolve in a tank having a flat bottom surface and a cylindrical inner surface, the frame-type blades It has a vertical side extending linearly along the inner side surface and a bottom side extending linearly along the bottom surface of the tank, and the vertical side and the bottom side are orthogonal to each other at a position close to the bottom corner of the tank. A curved surface having a radius of curvature of 2 mm (2R) to 15 mm (15R) is provided on the entire periphery of both corners of the tip of the coupling part and the corners of the bottom surface of the tank. A planetary mixer characterized by being formed.   2. The planetary mixer according to claim 1, wherein the curvature radii of the curved surfaces of both corners of the bottom side of the frame blade and the bottom corner of the tank are 3 mm (3R) to 10 mm (10R) in radius.

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