KR20090104715A - Media mixing mill - Google Patents

Abstract

PURPOSE: A media mixing mill is provided to secure uniform grindability and dispersion force, thereby improving high quality of products. CONSTITUTION: A media mixing mill(10) comprises a grinding container(12), agitator(22), grinding media(30), and centrifugal media separator(32). The grinding container has a raw material inlet(16) thereon. The grinding container has a spheral grinding chamber(14). The agitator is installed near the inner wall of the grinding container to rotate. The grinding media is accommodated in the grinding chamber. The centrifugal media separator is arranged to rotate while facing toward the agitator.

Description

MEDIA MIXING MILL

The present invention relates to a medium mixing mill. In the medium-mixed mill of the present invention, a raw material such as ink, paint, pigment, ceramic, metal, inorganic material, dielectric material, ferrite, toner, glass, paper coating color, etc. is mixed with a grinding media to be pulverized or dispersed into fine particles. Particularly suitable for use, but not limited to.

The medium-mixing mill of the present invention is a kind of medium-stirring mill, and the medium-stirring mill is in the field of fine grinding such as dispersion of ink or paint, grinding or dispersion of ceramics, grinding or dispersion of metals or inorganic materials, grinding or dispersion of medicines, etc. Often used in, various types are already known.

Conventionally, the media agitating mill stirs a processed object and a grinding medium together by the stirring member provided in the grinding container, and grinds the processed object, and the processed material and the grinding medium are separated by a separator provided at the end of the flow path of the processed product. And separate only the treated material from the inside of the grinding tank.

In such a media agitating mill, a separator for separating the pulverized medium and the processed object is necessary, and a separator having a mechanical separation mechanism such as a gap type or a screen type is used.

However, in a separator having a mechanical separating mechanism, troubles such as pinching and clogging are always affected, and stable continuous operation is threatened.

In order to solve the problem of the separator, the centrifugal force is applied to the grinding medium and the treated material, stirred and pulverized, and the balance between the centrifugal force and the drag caused by the fluid transporting the processed material in the direction opposite to the action direction of the centrifugal force. By this, a medium stirring mill (grinding machine) provided with a stirring separation member for separating a pulverized medium and a pulverized processed object has been proposed (see Patent Document 1, for example).

However, in the medium stirring mill (crusher) of the above structure, the stirring separating member is integrally provided at equal intervals in the circumferential direction with the front disc and the rear disc facing each other at predetermined intervals in the axial direction of the rotation axis. It was expensive because it had a complicated structure which consists of several wing plate which intersects a front disc. For this reason, the replacement cost of the stirring separation member has increased because the stirring separation member wears remarkably depending on the kind of processing material. In addition, in order to cope with the diversification of the processing material, the shape of the inner surface of the grinding tank can be changed and adjusted, but a large number of expensive stirring separation members corresponding to the shape of the inner surface of the grinding tank must be provided. The cost has increased.

By the way, a media agitating mill is provided in Japanese Patent Laid-Open No. 2005-199125, which is capable of stable pulverization and separation without a trouble such as pinching or clogging, and having a simple and inexpensive stirring separation member. .

The media agitating mill proposed in Japanese Laid-Open Patent Publication No. 2005-199125 includes a grinding tank having a grinding chamber for receiving a grinding medium therein, a rotating shaft rotatably installed in the grinding tank, and the grinding of the rotating shaft. A medium stirring mill provided at a portion located in a chamber and having a stirring separation member rotatable integrally with a rotating shaft, wherein the inner wall surface of the grinding chamber and the outer peripheral surface of the stirring member are formed in a shape coincident with each other, A separation discharge passage penetrating from the outer peripheral surface of the stirring separation member to the central portion of the stirring member, and communicating with the outside of the grinding chamber through the central portion of the rotating shaft, and between the upper and lower surfaces of the stirring member in the axial direction of the rotating shaft. The penetrating means employs a means for forming pressure relief holes in communication between the upper part and the lower part in the grinding chamber.

However, in the medium stirring mill of the above structure, the grinding medium tends to be concentrated at the largest diameter portion where the centrifugal force is maximum, and the dispersion force and the grinding force vary locally from place to place, and the difference is large. With such condensed milk, there is a problem that it is difficult to uniformly disperse and pulverize the raw material and to obtain a high quality product.

[Patent Document 1]

JP 2003-144950 A

[Patent Document 2]

Japanese Patent Application Laid-Open No. 2005-199125

Then, an object of this invention is to provide the medium mixing type mill which can obtain a high quality product by a good grinding | pulverization and dispersion action.

The said object is achieved by the medium mixing type mill by this invention of the structure of following (1)-(9).

(1) a grinding container having a raw material inlet and having a spherical grinding chamber, a stirring member rotatably installed in the grinding chamber near an inner wall of the grinding container, a grinding medium accommodated in the grinding chamber, and A medium mixing mill, comprising: a centrifugal media separator disposed rotatably in a grinding chamber so as to face said stirring member.

(2) The medium-mixing mill according to the above (1), wherein the medium separating member is arranged near the center of the spherical grinding chamber.

(3) The medium-mixing mill according to the above (1) or (2), wherein the grinding container itself is spherical.

(4) The medium mixing type according to any one of (1) to (3), wherein the stirring member is rotatable around a rotating shaft passing through the center of the circular grinding chamber. wheat.

(5) The medium-mixing mill according to the above (4), wherein the grinding vessel can be divided into two through the center of the grinding chamber and orthogonal to the rotary shaft of the stirring member. .

(6) Any one of the above items (1) to (5), characterized in that a jacket for passing a coolant body or a heat medium through the outer circumference of the pulverization container, and the inside of the pulverization chamber can be temperature controlled. The medium-mixed mill of any one of Claims.

(7) The medium-mixing mill according to any one of (1) to (6), wherein the stirring member can be driven at a rotational speed in the range of 5 to 40 m / s.

(8) any one of (1) to (7) above, wherein the stirring member is disposed below the grinding chamber and the medium separating member is disposed above the grinding chamber. The medium mixed mill of Claim.

(9) The medium separating member is fixed to one end, and the medium separating member driving shaft is extended to the outside of the grinding chamber, and the inside of the medium separating member driving shaft is a raw material outlet. The medium-mixed mill as described in any one of said (1)-(8) characterized by the above-mentioned.

In the medium-mixing mill of the present invention, as described above, the stirring member is provided inside the grinding chamber near the inner wall of the grinding vessel (hereinafter, the stirring member will be described as being installed in the lower part of the grinding chamber). The grinding medium is moved from the lower part of the spherical grinding chamber in which the stirring member is installed to the upper part, and descends and is separated from the media separation member near the center to return to the stirring member. Therefore, the raw materials are pulverized and dispersed by the shear force generated by the contact of the grinding media to be long-distance moving and mixing, so that uniform dispersion is possible and high quality products can be obtained.

In addition, in the media-type mill of the present invention, since most of the centrifugal force is converted to the kinetic force of the grinding media, the grinding media are smoothly moved up and down near the inner wall of the grinding vessel and descended from the center to return to the stirring member. Since segregation of the medium hardly occurs, and the grinding force and the dispersing force are uniform, uniform dispersion is possible and a high quality product can be obtained.

In addition, in the media-type mill of the present invention, since the degree of freedom of the grinding media is large and energy is dispersed, there is no local heat generation and the like, and a high-speed rotational operation of the stirring member can be performed, so that high-performance dispersion is possible. .

In the above operation, the medium-milling mill of the present invention is very suitable for use as a raw material which may be deteriorated when a strong dispersing force is applied.

EMBODIMENT OF THE INVENTION Hereinafter, the medium mixing type mill by embodiment of this invention is demonstrated, referring an accompanying drawing. In addition, although the vertical mill is demonstrated in the following description, of course, the mill of this invention may be a horizontal type.

FIG. 1 shows a medium mixing mill 10 according to an embodiment of the present invention, and the medium mixing mill 10 includes a substantially spherical grinding container 12. This grinding container 12 has a spherical grinding chamber 14 therein, and has a raw material inlet 16 for introducing a slurry-like raw material into the grinding chamber 14. In addition, if only the grinding chamber 14 is spherical, what kind of shape may be sufficient as the shape of the grinding container 12 itself, It is preferable that it is spherical as mentioned above. A circular opening 12a is formed in the lower center of the crushing container 12 (the same opening is formed in the jacket to be described later), and in this opening 12a, the upper center of the frame 18 The ring-shaped part 18a which protrudes upwards is fitted. On the other hand, a circular opening 12b is formed in the upper center of the crushing container 12 (the same opening is also formed in the jacket to be described later), and the cylindrical casing 20 is formed in the opening 12b. This fitting is fitted, and the lower end of this casing 20 extends vertically to the grinding chamber 14 vertically.

In the inner lower center of the grinding chamber 14 of the grinding vessel 12, a stirring member 22 is rotatably disposed. The stirring member 22 may be of a conventional structure, but for example, a hub portion 22a disposed at the center, an extension portion 22b extending a predetermined length from the hub portion 22a to a radially outer side, And a main portion 22c of the stirring member which is substantially toothed in the shape of a cog wheel supported by the outer peripheral end of the extension portion 22b. A plurality of openings 22d are formed in the extension part 22b, and the plurality of openings 22d are a plurality of openings for circulating grinding media. The hub 22a is fixed with a rotation drive shaft 24 which is a stirring member drive shaft. The rotary drive shaft 24 extends through the frame 18 downward in the axial direction, and the end portion thereof is connected to a drive source through a known drive mechanism (not shown), and is shown in the direction indicated by the arrow in the figure. Rotationally driven. It is preferable that the rotation axis (rotation axis line) of this rotation drive shaft 24 passes through the center of the spherical grinding chamber 14. Further, an axial rod 25 (mechanical seal or the like) is formed on the rotary drive shaft 24. As is well known in the medium mixing mill, a bead shaped grinding medium 30 (also shown in a large enlarged view) is housed in the grinding container 12. The grinding media 30 may be one having a diameter of 0.02 to 2 mm.

A medium which is disposed above the central portion of the grinding chamber 14 as an upper portion of the grinding chamber 14 of the grinding chamber 12 so as to face the stirring member at intervals in the axial direction and is dispersed in a slurry-like raw material ( A centrifugal media separation member 32 for separating 30 from the raw material is provided. The medium separating member 32 is a centrifugal vane type, and is preferably arranged coaxially with the stirring member, but the shaft may be off. A hollow rotary drive shaft 34 is fixed to the medium separating member 32. This drive shaft 34 penetrates through the casing 20 and extends upward, and this end portion is connected to a drive source through a known drive mechanism (not shown), and is driven to rotate in the direction indicated by the arrow in the figure. In addition, an axial rod 36 (mechanical seal or the like) is formed on the rotary drive shaft 34. In addition, the hollow portion of the drive shaft 34 communicates with the inner space of the medium separating member 32, and forms the raw material outlet portion 38. As shown in FIG.

The medium separating member 32 has a plurality of wing members 44 arranged at equal intervals in the circumferential direction (coaxial to the rotation driving shaft 34) between the hub portion 32a and the closing plate 32b ( See FIG. 2 (A). The said wing member 44 may be arrange | positioned completely radially as shown to the said FIG. 2 (A), and may be arrange | positioned inclined as shown to FIG. 2 (B). The blade member 44 may be a quadrangular shape, the cross section of which is gradually tapered inward as shown in Fig. 2C.

The outer circumference of the pulverization container 12 is provided with a jacket 40 for passing through a coolant body or a heat medium (usually a coolant body, cooling water), and makes it possible to adjust the temperature inside the pulverization chamber 14. The jacket 40 is provided with a cooling water inlet 42 for introducing cooling water in the lower part and a cooling water outlet 46 for discharging the cooling water in the upper part.

The grinding container 12 passes through the center of the grinding chamber 14 and can be divided into two in the plane orthogonal to the rotation axis (vertical shaft) of the stirring member 22. The same is true of the jacket 40. As a result, the pulverization container 12 is opened, and the water can be easily repaired.

In the medium mixing mill of the present invention, the stirring member 22 can be driven at a rotational speed in the range of 5 to 40 m / s, and the medium separating member 32 is in the range of 10 to 20 m / s. Can be driven at rotation speed.

In the operation, the stirring member 22 is rotationally driven while introducing the raw material, which is a slurry containing the particles to be ground, into the grinding chamber 14 at the raw material inlet 16. The slurry introduced into the grinding chamber 14 is moved downward in the direction of the stirring member 22 in the rotational flow direction f1 of the slurry and the medium 30 already formed in the grinding chamber 14, It is stirred and mixed by the stirring member 22. The slurry and the medium 30 which are stirred and mixed become a flow direction f2 which moves up and down the inner wall of the grinding chamber 14 this time, and if it continues to rise, this time becomes the previous flow direction f1. . Just above the center of the grinding chamber 14, the slurry and the medium are given a rotational motion by the media separating member 32. By this rotational movement, the mass medium is urged radially outward and is separated from the slurry. In this case, among the crushed particles, the pulverization is insufficient and the particle size is large, similarly to the medium. On the other hand, the slurry containing particles that have been sufficiently pulverized and whose mass has been reduced is introduced into the inner space of the medium separating member 32 and discharged to the outside of the medium mixing mill through the raw material outlet 38 inside the rotating shaft 34. do. With this configuration, in the flow directions f1 and f2, the raw material particles are crushed and dispersed in good quality by the contact of the pulverizing medium freely moving, and as a result, a high quality product is obtained. Moreover, according to the medium mixing type mill of this invention, it becomes possible to achieve grinding | pulverization with a narrow particle size distribution width | variety by said effect | action.

In the medium mixing mill of the present invention, since the stirring member 22 is sufficiently separated from the medium separating member 32, the interference of the medium separating member 32 is extremely small.

1 is a cross-sectional view showing a medium mixing mill according to an embodiment of the present invention;

2 (A), 2 (B), and 2 (C) are cross-sectional views illustrating examples of the wing members of the media separation member used in the media mixing mill shown in FIG. 1, respectively.

<Description of main parts of drawing>

10: medium mixing mill 12: grinding container

12a, 12b: opening 14: grinding chamber

16: raw material inlet 18: frame

18a: ring-shaped portion 20: casing

22: stirring member 22a, 32a: hub portion

22b: extension part 22c: main part of the stirring member

22d: opening 24: rotating drive shaft

25, 36: shaft 30: grinding media

32: medium separating member 32b: closing plate

34: hollow drive shaft 38: raw material outlet

40: jacket 40a: cooling water inlet

40b: cooling-out port 44: wing member

Claims (9)

A grinding container having a raw material inlet and having a spherical grinding chamber, a stirring member rotatably installed in the grinding chamber near an inner wall of the grinding chamber, a grinding medium accommodated in the grinding chamber, and inside the grinding chamber; And a centrifugal media separator disposed rotatably opposite the stirring member. The method of claim 1, And the medium separating member is disposed near a central portion of the spherical grinding chamber. The method according to claim 1 or 2, Medium grinding mill, characterized in that the grinding container itself is spherical. The method according to any one of claims 1 to 3, And the stirring member is rotatable around a rotating shaft passing through the center of the circular grinding chamber. The method of claim 4, wherein A medium-mixing mill, which passes through the center of the grinding chamber and can be divided into two in terms of orthogonal to the rotating shaft of the stirring member. The method according to any one of claims 1 to 5, A medium-mixing mill having a jacket for allowing a refrigerant or a heat medium to pass through the outer circumference of the pulverization container, and allowing the inside of the pulverization chamber to be temperature controlled. The method according to any one of claims 1 to 6, Medium mixing mill, characterized in that the stirring member can be driven at a rotational speed in the range of 5 ~ 40m / s. The method according to any one of claims 1 to 7, And a vertical type, wherein the stirring member is disposed below the grinding chamber, and the media separation member is disposed above the grinding chamber. The method according to any one of claims 1 to 8, The medium separating member is fixed to one end, and has a hollow medium separating member driving shaft extending out of the pulverization chamber, and the inner side of the medium separating member driving shaft is an additional raw material outlet. Medium mixed wheat.

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