WO2018220679A1

WO2018220679A1 - Powder mixing method

Info

Publication number: WO2018220679A1
Application number: PCT/JP2017/019925
Authority: WO
Inventors: 泰三吉田; 正三朝日
Original assignee: 株式会社徳寿工作所
Priority date: 2017-05-29
Filing date: 2017-05-29
Publication date: 2018-12-06

Abstract

This powder mixing method enables homogeneous mixing in a short period of time, and enables a high mixing-in rate (the ratio of the loading volume of the powder to be mixed to the capacity of the mixing container) to be achieved. The method for mixing a powder uses a container-rotating-type double-layer conical mixer, and the method is characterized in that when the mixing container is being rotated, the powder to be mixed is caused to move in the shape of the infinity symbol and is mixed in the mixing container.

Description

How to mix powder

The present invention relates to a method for mixing granular materials, and more particularly, to an improvement in a method for mixing granular materials using a container rotating double cone type mixer (W cone type mixer).

In the fields of foods, pharmaceuticals, chemicals, etc., there are many cases where a plurality of different types of powder particles are mixed in the manufacturing process of the product. For this reason, the powder particles are contained in a mixing container for containing and mixing the particles. A mixer is used in which a plurality of types of powder particles are charged and the mixing vessel is rotated to stir and mix the powder particles. As such a mixer, a container rotating double cone type mixer (W cone) is used. Type mixer) is widely used.

The conventional W cone type mixer is provided with a truncated conical container on the upper and lower sides of the cylindrical body, and the inlet of the granular material to be mixed at the top of the upper truncated cone container, A mixing container having a substantially diamond-shaped cross section is provided, each having a discharge port for the mixed powder particles at the top of the frustoconical container, and a rotating shaft so that the axis passes through the cylindrical body of the mixing container And the mixing container is rotated around the rotation shaft to mix two or more kinds of powder particles charged into the mixing container through the charging port.

The movement of the powder particles in the mixing container accompanying the rotation is a movement that diffuses downward along the wall surface of the upper frustoconical container and a movement that moves downward along the wall surface of the lower frustoconical container. Then, diffusion and convection due to movement in the direction of the rotation axis (horizontal direction) in the cylindrical body portion, and the addition of shearing elements are added to mix the particles.

However, in the conventional W cone type mixer, since the direction of convection is constant and there are not enough shearing elements, it takes a long time to obtain homogeneous mixing. In particular, when the powder body is charged up to a position satisfying the cylindrical body, mixing is reduced, the movement in the direction of the rotation axis in the cylindrical body is less likely to occur, and poor mixing occurs. There is a problem in that the mixing efficiency is also lowered. Therefore, in the conventional W cone type mixer, the charging rate of the powder to be mixed is limited to about 45% with respect to the capacity of the mixing container.

In order to solve such a problem, in the W cone type mixer, the cone of at least one frustoconical container part of the two frustoconical container parts provided on the upper side and the lower side of the cylindrical body part. There has been proposed a mixer that has a configuration in which the shaft is eccentric from the center line of the mixing vessel and can improve the mixing speed (Patent Document 1).

However, even in the proposed mixer, compared to the conventional W cone type mixer, there is no significant change in the movement of the granular material in the mixing container accompanying the rotation, and the shearing factor is not sufficient. The problem that time is required cannot be sufficiently solved, and when the powder is charged to the position where the cylindrical body is filled, mixing failure tends to occur and mixing efficiency is reduced. It was also difficult to eliminate the conventional problem of doing.

JP-A-8-155285

The present invention relates to a method of mixing powder particles using a container rotating double cone type mixer (W cone type mixer), and the structure of the mixing container and the powder particles in the mixing container accompanying the rotation of the mixing container As a result of repeated examinations on the relationship with the movement of the material, its purpose is to enable homogeneous mixing in a short time and to supply a high preparation rate (powder to be mixed with the mixing vessel capacity) It is an object of the present invention to provide a method for mixing granular materials that can also achieve a volume ratio).

According to a first aspect of the present invention, there is provided a method for mixing powder particles, wherein a frustoconical container is provided on the upper and lower sides of the cylindrical body, and is mixed at the top of the upper frustoconical container. A mixing container having a substantially diamond-shaped cross section provided with an inlet for power particles and an outlet for the mixed powder at the top of the lower frustoconical container; Using a container-rotating double-cone mixer that mixes the powder and granular materials charged in the mixing container by rotating the mixing container and rotating the mixing container so that the axis passes through the cylindrical body In the method of mixing powder particles, when the mixing container is rotated, the powder particles are mixed by causing the powder particles to be mixed in the mixing container to move like an infinite symbol.

According to a second aspect of the present invention, there is provided a method for mixing powder particles according to the first aspect of the present invention. It is characterized by mixing the powder and granular material.

According to a third aspect of the present invention, there is provided a method for mixing granular materials according to the second aspect, wherein the powder is provided at the center of the inlet provided at the top of the upper truncated conical container and at the top of the lower truncated conical container. The mixing container whose center position of the discharge port coincides with the vertical direction is rotated.

According to a fourth aspect of the present invention, there is provided a method for mixing granular materials according to the second aspect, wherein the powder is provided at the center of the inlet provided at the top of the upper truncated conical container and at the top of the lower truncated conical container. The mixing container whose center position of the discharge port is shifted in the rotation axis direction of the mixing container is rotated.

According to a fifth aspect of the present invention, there is provided a method for mixing granular materials according to the second aspect of the present invention, wherein the center position of the charging port provided at the top of the upper truncated conical container and the top of the lower truncated conical container are provided. The mixing container whose center position of the discharge port is shifted in the rotation direction of the mixing container is rotated.

According to a sixth aspect of the present invention, there is provided a method for mixing granular materials according to the second aspect of the present invention, which is provided at the center position of the inlet provided at the top of the upper truncated conical container and at the top of the lower truncated conical container. A mixing container whose center position of the discharge port is shifted in the rotation axis direction and the rotation direction of the mixing container is rotated.

According to the present invention, the following effects can be obtained in the powder mixing method using a container rotating double cone type mixer (W cone type mixer) as compared with the conventional method.

By moving the powder particles to be mixed in the mixing container like an infinite symbol, the position of all the powder particles in the mixing container can be moved. Is possible. For example, when the feed rate is 45% under the conditions of a particle size of 10 mm, 60,000 particles, and a rotational speed of 25 rpm, a mixing achievement exceeding 0.85 can be achieved in a mixing time of 50 minutes, and the feed rate is 70%. Even in this case, a mixing achievement of 0.8 can be obtained in 50 minutes.

Since the whole charged granular material can be moved greatly, mixing at a high charging rate of up to about 70% becomes possible, and space saving can be achieved.

It is the figure which looked at the mixing container of the 1st Embodiment of this invention from the plane (FIG. 1 (A)) and the side surface (FIG.1 (B)), and the inclined cylindrical trunk | drum 2 of the mixing container 1, and an inclined cylinder A

frustoconical container

3, 4 provided on the upper side and the lower side of the cylindrical body 2, an inlet 5 for the granular material to be mixed provided on the top of the upper frustoconical container 3, and a lower part The structure of the discharge port 6 of the mixed powder provided at the top of the side truncated conical container 4 and the movement of the powder in the mixing container 1 rotating in the direction of the arrow around the rotation shaft 7 (Material flow) 8 is shown. Reference numeral 9 denotes a central axis of the mixing container 1. It is the figure which looked at the mixing container of the 2nd Embodiment of this invention from the plane (FIG. 2 (A)) and the side surface (FIG. 2 (B)). It is the figure which looked at the mixing container of the 3rd Embodiment of this invention from the plane (FIG. 3 (A)) and the side surface (FIG. 3 (B)). It is the figure which looked at the mixing container of the 4th Embodiment of this invention from the plane (FIG. 4 (A)) and the side surface (FIG. 4 (B)).

Hereinafter, the mixing method of the granular material of the present invention will be described with reference to the drawings. As described above, the present invention relates to an improvement of a method for mixing powder particles using a container rotating double cone mixer, and as shown in FIGS. 1 to 4, the cylindrical body is inclined. As shown in FIGS. 1 (B) to 4 (B), when the mixing container 1 is rotated, the granular material to be mixed in the mixing container 1 is formed by the inclined cylindrical body 2 formed in a cylindrical shape. It is characterized in that the particles are mixed by moving like an infinite symbol (the material flow 8 shown in FIGS. 1B to 4B). The infinite symbol is a symbol obtained by rotating the number 8 by 90 degrees with a symbol (∞) representing infinity.

When the mixing body 1 is rotated by forming the cylindrical body portion into an inclined cylindrical shape, the powder particles to be mixed in the mixing container 1 are denoted by reference numeral 8 in FIGS. 1 (B) to 4 (B). Such a motion like an infinite symbol can be made, and by giving such a flow to the powder particles in the mixing container 1, the dispersion movement of the powder particles in the vicinity of the rotating shaft 7 of the mixing container 1 becomes intense. Even when the charging rate is increased and the barrel is filled with the powder particles above the rotation axis, an excellent mixing result can be obtained. In addition, mixing of powder particles having poor fluidity is possible. In addition, if the cylindrical trunk | drum is formed in the inclination cylindrical shape, the shape of the truncated conical container provided in the upper side and lower side of a trunk | drum may be arbitrary shapes.

Hereinafter, a preferred embodiment for causing the granular material to be mixed in the mixing container to move like an infinite symbol as shown in FIGS. 1 (B) to 4 (B) when the mixing container is rotated will be described. To do.
First embodiment:
As shown in FIG. 1, the mixing method of the granular material by 1st Embodiment forms the upper frustoconical container 3 and the lower frustoconical container 4 in the shape of an unequal frustoconical cone. The center position 5C of the inlet 5 provided at the top of the upper truncated conical container 3 and the center position 6C of the outlet 6 provided at the top of the lower truncated conical container 4 coincide with each other in the vertical direction. The mixing container 1 (on the central axis 9 of the mixing container 1) is rotated.

According to the first embodiment, the dispersion movement of the powder particles in the direction of the rotation axis is promoted, and mixing is possible even if the particles are charged to the upper part of the rotation shaft, and the charging rate is increased. Can do. In addition, mixing of powder particles having poor fluidity is possible.

Second embodiment:
As shown in FIG. 2, the mixing method of the granular material according to the second embodiment forms the upper frustoconical container 3 and the lower frustoconical container 4 in an equilateral frustoconical shape, The center position 5C of the inlet 5 provided at the top of the upper truncated conical container 3 and the center position 6C of the outlet 6 provided at the top of the lower truncated conical container 4 are shifted in the direction of the rotation shaft 7. The mixing container 1 is rotated.

Compared to the first embodiment, the second embodiment has a slightly weaker dispersion movement to the rotating side of the powder, but the dispersion is sufficiently strong compared to the case where the barrel is formed in a straight cylinder shape. The transfer is performed and an excellent mixing result is obtained, and the mixing of powders and particles having slightly poor fluidity is also possible. Further, since an equal equilateral frustoconical container can be applied as the upper frustoconical container 3 and the lower frustoconical container 4, the manufacture of the

containers

3 and 4 is facilitated. There is also an advantage that the manufacturing cost of 4 can be reduced.

Third embodiment:
As shown in FIG. 3, the mixing method of the granular material by 3rd Embodiment forms the upper frustoconical container 3 and the lower frustoconical container 4 in an unequal frustoconical shape. The center position 5C of the inlet 5 provided at the top of the upper truncated conical container 3 and the center position 6C of the outlet 6 provided at the top of the lower truncated conical container 4 are the rotational directions of the mixing container 1. The mixing container 1 shifted in the direction of the central axis 9 of the mixing container 1 is rotated.

Compared with the first embodiment, the third embodiment has a stronger dispersion and movement of the granular material to the rotating side, and can also mix the granular material with poorer fluidity.

Fourth embodiment:
As shown in FIG. 4, the method for mixing granular materials according to the fourth embodiment is such that the upper frustoconical container 3 and the lower frustoconical container 4 are formed in an unequal frustoconical shape. The center position 5C of the inlet 5 provided at the top of the upper truncated conical container 3 and the center position 6C of the outlet 6 provided at the top of the lower truncated conical container 4 are the rotation axes of the mixing container 1. 7 is characterized in that the mixing container 1 which is displaced in both the direction 7 and the direction of rotation is rotated.

Compared with the third embodiment, the fourth embodiment further increases the dispersion and movement of the powder particles to the rotating side, and also enables mixing of the powder particles having very poor fluidity.

As described above, in the W cone type mixer, the cylindrical body is formed in an inclined cylindrical shape, so that when the mixing container is rotated, the granular material to be mixed in the mixing container is shown in FIGS. 4 (B) can give a flow like an infinite symbol, and this flow makes the dispersion and movement of the powder and particles in the vicinity of the rotating shaft 7 of the mixing container 1 violent. Even when the charging rate is increased and the powder body is filled up to above the rotational axis, an excellent mixing result can be obtained.

DESCRIPTION OF SYMBOLS 1 Mixing container 2 Inclined cylindrical trunk | drum 3 Upper frustoconical container 4 Lower frustoconical container 5 Inlet 6 Outlet 7 Rotating shaft 8 Material flow 9 Center axis 5C of mixing container Center position 6C Center position of outlet 6

Claims

A frustoconical container is provided on the upper and lower sides of the cylindrical body, and the inlet of the powder to be mixed is added to the top of the upper frustoconical container, and mixed at the top of the lower frustoconical container. A mixing vessel having a substantially diamond-shaped cross-section, each provided with a discharge port for the powdered granular material, and rotating the mixing vessel with an axis of rotation passing through the cylindrical body of the mixing vessel In the method of mixing powder using a container rotating double cone mixer that mixes the powder charged in the mixing container, when the mixing container is rotated, the mixing container A method for mixing particles, which comprises mixing particles by causing the particles to be mixed to move like an infinite symbol.
By rotating the mixing container in which the cylindrical body portion is formed in an inclined cylindrical shape, the granular material charged in the mixing container is moved like an infinite symbol to mix the granular material. The method for mixing powder particles according to claim 1.
Rotate the mixing container in which the center position of the inlet provided at the top of the upper frustoconical container and the center position of the outlet provided at the top of the lower frustoconical container coincide in the vertical direction The mixing method of the granular material of Claim 2 characterized by the above-mentioned.
Mixing in which the center position of the inlet provided at the top of the upper frustoconical container and the center position of the outlet provided at the top of the lower frustoconical container are shifted in the rotation axis direction of the mixing container The method for mixing powder particles according to claim 2, wherein the container is rotated.
A mixing container in which the center position of the inlet provided at the top of the upper truncated conical container and the center position of the outlet provided at the top of the lower truncated conical container are shifted in the rotation direction of the mixing container The method for mixing powder particles according to claim 2, wherein:
The center position of the inlet provided at the top of the upper frustoconical container and the center position of the outlet provided at the top of the lower frustoconical container are shifted in the rotation axis direction and the rotation direction of the mixing container. The mixing container according to claim 2, wherein the mixing container is rotated.