JP6884942B2 - Media stirring type crusher - Google Patents

Description

The present invention relates to a media stirring type crusher. The media stirring type crusher of the present invention uses raw materials such as ink, paint, pigment, ceramic, metal, inorganic substance, dielectric material, ferrite, toner, glass, coating color for papermaking, and other nanoparticles as bead-like crushing / dispersing media. It is particularly suitable, but not limited to, for use in mixing and grinding or dispersing into fine particles.

The nanoparticles as described above have a strong cohesive force, form aggregates immediately after synthetic production, and cannot exhibit the desired function, and therefore need to be dispersed. A media stirring type crusher is often used for this dispersion. In a media stirring type crusher, when a raw material such as nanoparticles is crushed and dispersed, the nanoparticles are sensitive, and therefore, as shown in JP-A-2010-253339, as a bead-like crushing / dispersing medium. Mainly, microbeads having a diameter of about 0.03 to 0.1 mm are used.

When microbeads are used in this way, a centrifugal type media separation member is adopted rather than a screen type. The reason is that the screen type media separating member requires strict processing accuracy of the screen opening, which is technically difficult or costly even if it can be made, which is not realistic. Further, since the opening area of the eyes of the screen is also extremely small, there is a problem that the passage resistance becomes extremely large and clogging is likely to occur, but the centrifugal type does not have such a problem. ..

The overall structure of the media stirring type crusher when a crushing container having a vertical cylindrical crushing chamber is used is as shown in Japanese Patent Application Laid-Open No. 2010-253339.

With a media separation member having such a structure, focusing on the media separation function of the media separation member, various factors such as the structure of the crushing container of the media stirring type crusher were changed, and the media separation function was examined. It was found that the media separation function of the media separation member changes significantly depending on the difference.

Therefore, the inventors further investigated which factor of the media stirring type crusher affects the media separation function of the media separation member, and found that this separation function is the media around the centrifugal media separation member. It was found that it changes greatly depending on the concentration of. That is, the inventors have found that the lower the concentration of the media around the media separation member, the better the separation function (media separation rate) of the media separation member.

Based on this finding, the present inventors have previously referred to Japanese Patent Application No. 2013-115117 (Japanese Patent Laid-Open No. 2014-18797), which media with extremely good separation of media from pulverized and dispersed raw materials (slurry). A stirring type crusher was provided.

The media stirring type crusher proposed in Japanese Patent Application No. 2013-115117 is a crushing container having an end plate that closes the upper part and having a vertical cylindrical crushing chamber that accommodates bead-shaped crushing / dispersion media. A raw material slurry supply port provided in the crushing container, a stirring member which is a lower part of the crushing chamber and has a rotation axis substantially coaxial with the axis of the crushing chamber, and a centrifugal media provided above the stirring member. In a media stirring type crusher provided with a separating member, a media separating member accommodating a media separating member accommodating chamber provided in the center of the end plate, having a lower surface opening opened in the crushing chamber, and having a media separating member accommodating chamber accommodating the media separating member. Media stirring is provided with means, and media flow regulating means for restricting the crushing / dispersion media in the crushing chamber from flowing into the separating member accommodating chamber is provided so as to surround the lower surface opening of the end plate. It is a type crusher.

According to this media stirring type crusher, a media separating member accommodating means having a media separating member accommodating chamber accommodating the media separating member is provided, and a media flow that hinders the flow of media from the crushing chamber to the media separating member accommodating chamber is provided. By providing the road regulation means, the media concentration in the crushing chamber is secured, and the crushing chamber is raised by the action of the stirring member provided in the lower part of the crushing chamber in a state where the crushing / dispersing function of the raw material is secured in the same manner as before. By guiding the mixture of the raw material slurry and the media to be directed toward the stirring member again and reducing the amount of free-flowing media as much as possible, the media flow is given directionality and the amount of free-flowing media is reduced as much as possible. Since the amount of media flying into the separating member accommodating chamber can be reduced as much as possible to reduce the media concentration in the media separating member accommodating chamber, the media separating function can be dramatically improved.

Japanese Unexamined Patent Publication No. 2010-253339

Japanese Unexamined Patent Publication No. 2014-18977

An object of the present invention is to propose a media stirring type crusher having a structure capable of further improving the media separation function.

The above object is achieved by the media stirring type crusher of the present invention having the following configurations (1) to (7).
(1)
In a crushing container having a vertical cylindrical crushing chamber containing a bead-shaped crushing medium, a stirring member below the crushing chamber and having a rotation axis substantially coaxial with the axis of the crushing chamber, and the crushing chamber. In a media stirring crusher provided with a centrifugal media separating member provided above the stirring member, the media stirring crusher has a substantially cylindrical rotary blade that rotates around the media separating member, and is contained in a raw material slurry. An auxiliary media separating member that acts to separate the crushed media from the media separating member is provided, and the rotating blades are arranged coaxially with the stirring member and supported by a disk-shaped support member below the stirring member. A media stirring type crusher characterized in that a rotation drive shaft is extended upward coaxially with the rotation shaft of the stirring member from the stirring member, and the upper end thereof is coupled to the center of the support member.
(2)
The media stirring type crusher according to (1), wherein the support member of the media separating member is provided with a plurality of openings for forming a circulation path of the crushing media.
(3)
The rotary blade is the media stirring type crusher according to (1) or (2), which includes a plurality of columnar members arranged at intervals around the rotary blade.
(4)
The media stirring type crusher according to (3) above, wherein the columnar member has a triangular cross section having a bottom surface on the outer peripheral side and a long side on the inner peripheral side.
(5)
The media stirring type crusher according to any one of (1) to (4) above, wherein the rotary blade is made of ceramics.
(6)
The media stirring type crusher according to any one of (1) to (5) above, wherein the rotary blade is made of resin.
(7)
A guide ring having a predetermined height is provided between the rotary drive shaft and the peripheral wall of the crushing container, and the raw material slurry in which the crushing media is dispersed between the outer peripheral wall of the guide ring and the inner peripheral wall of the crushing container. The media stirring type pulverizer according to any one of (1) to (6) above, which is used as an ascending passage for the flow of the raw material and as a descending passage for the raw material slurry between the inner peripheral wall of the guide ring and the rotary drive shaft.

In the media stirring type crusher of the present invention, as described above, an auxiliary media separating member is provided around the media separating member to minimize the density of the crushed media around the media separating member, and the auxiliary media. Due to the action of the separating member, the crushed media is uniformly distributed around the media separating member, so that the media separating function of the media separating member is significantly improved more than expected, and there is almost no crushed media discharged to the outside of the apparatus.
As a result, the post-treatment of the refurbished product becomes extremely easy, and the crushing media is not discharged from the crushing chamber, so that the need for replenishment is extremely reduced.

It is sectional drawing which shows the media stirring type crusher by embodiment of this invention. It is a horizontal sectional view of the auxiliary media separating member used in the media stirring type crusher of FIG. It is a vertical cross-sectional view of the auxiliary media separating member used in the media stirring type crusher of FIG. FIG. 5 is a horizontal cross-sectional view showing a guide ring and a rectifying means used in the media stirring type crusher of FIG. It is a perspective view which shows the guide ring and the rectifying means of FIG.

Hereinafter, the media stirring type crusher according to the embodiment of the present invention will be described with reference to the accompanying drawings.
FIG. 1 shows a media stirring type crusher 10 according to an embodiment of the present invention, in which the media stirring type crusher 10 has a vertical cylindrical crushing container 12 having an end plate 12a for closing the upper portion. I have. The crushing container 12 is provided with a columnar crushing chamber 14 inside, and has a raw material slurry supply port 16 for introducing a slurry-like raw material into the crushing chamber 14.

A stirring member 22 is rotatably arranged in the center of the lower part of the inside of the crushing chamber 14 of the crushing container 12. The stirring member 22 is an impeller, and is composed of, for example, a hub 22a and a plurality of blades 22b fixedly arranged around the hub 22a.

An upper end of the stirring member 22 is attached to the hub 22a of the stirring member 22, and a rotary drive shaft 24, which is a stirring member driving shaft extending downward in the axial direction through the crushing container 12, is fixed to the stirring member 22. The lower end of the rotary drive shaft 24 is connected to a drive source via a well-known drive mechanism (not shown), and the rotary drive shaft 24 is rotationally driven in the direction indicated by the arrow in the figure. It is preferable that the rotation axis (rotation axis) of the rotation drive shaft 24 passes through the central axis of the crushing chamber 14. The rotary drive shaft 24 is provided with a shaft seal 25 (mechanical seal or the like).

As is well known in the media stirring type crusher, the bead-shaped crushing media 30 (note that it is shown in an extremely enlarged manner in the figure) is housed inside the crushing container 12. As the pulverized media 30, a medium having a diameter of 0.02 to 2 mm can be used. The total volume of the crushing media is 30% to 75% of the volume of the crushing chamber. In a normal media stirring type crusher, the total volume of the crushing media is 80% to 90% of the volume of the crushing chamber. Therefore, the media stirring type crusher of the present invention has a small binding force and is softly crushed and dispersed. Is possible.

Above the stirring member 22, a centrifugal media separating member for separating the media 30 dispersed in the raw material slurry from the raw material, which is arranged so as to face the stirring member 22 at a distance in the axial direction. 32 is provided. The media separating member 32 includes a tubular main body 32a having a space inside. The main body 32a is provided with a plurality of openings, from which only the raw material slurry is introduced into the space inside the main body. The media separating member 32 is arranged coaxially with the stirring member 22. A hollow rotary drive shaft 34 is fixed to the media separation member 32. The drive shaft 34 extends upward, and its end is connected to a drive source via a well-known drive mechanism (not shown) and is rotationally driven in the direction indicated by the arrow in the figure. The rotary drive shaft 34 is provided with a shaft seal 36 (mechanical seal or the like). Further, the hollow portion of the drive shaft 34 communicates with the internal space of the media separation member 32 to form the raw material slurry outlet 38.

A jacket 13 (not shown) for passing a refrigerant body or a heat medium (usually a refrigerant body and cooling water) is provided on the outer periphery of the crushing container 12, and the temperature inside the crushing chamber 14 can be controlled. I have to. The jacket is provided with a cooling water inlet for introducing cooling water in the lower portion and a cooling water outlet for discharging cooling water in the upper portion.

In the media stirring type crusher of the present invention, the stirring member 22 can be driven at a rotational speed in the range of 5 to 70 m / s, and the media separating member 32 can be driven in the range of 10 to 20 m / s. It can be driven at a rotational speed.

An auxiliary media separating member 40 is provided around the media separating member 32 to prevent the crushed media from heading toward the media separating member 32. As shown in FIGS. 2 and 3, the auxiliary media separating member 40 has a substantially cylindrical rotary blade 42 that rotates coaxially with the media separating member 32 around the media separating member 32. It acts to separate the pulverized media 30 in the raw material slurry from the media separating member 32. The substantially cylindrical rotary blade 42 is supported by a disk-shaped support member 44 at the lower portion thereof.

Around the disk-shaped support member 44, a plurality of columnar members 42a having a triangular horizontal cross-sectional shape substantially forming the blade members of the rotary blade 42 are arranged at equal intervals. There is an opening 42b between these columnar members 42a. Further, an opening 44a is also formed in the support member 44, and the opening 42b and the opening 44a are used to circulate the crushing medium 30 penetrating the internal space of the rotary blade 42 as shown in FIG. It is said to be a route.

From the hub 22a of the stirring member 22, a rotation drive shaft 46 extends upward coaxially with the rotation shaft of the stirring member 22, and the upper end thereof is coupled to the center of the support member 44. This structure simplifies the structure of the drive unit of the auxiliary media separating member 40.

A guide ring 50 is arranged around the rotary drive shaft 46 in the lower part of the crushing chamber 14. The guide ring 50 is composed of an inner peripheral ring plate 52, an outer peripheral ring plate 54 spaced apart from each other in the outer peripheral direction, an annular lower ring plate 56 forming a lower side, and an upper ring plate 58 forming an upper side. Is liquidtight.

The guide ring 50 divides the lower portion of the crushing chamber 14 in the radial direction, and constitutes an inner portion 14a of the lower portion of the crushing chamber and an outer portion 14b of the lower portion of the annular crushing chamber. The outer portion 14b of the lower portion of the crushing chamber functions as an ascending passage of the mixture of the pulverized media and the raw material slurry, and the inner portion 14a of the lower portion of the crushing chamber functions as a descending passage of the mixture of the crushed media and the raw material slurry. ..

Since the guide ring 50 has the above-mentioned structure, it has an annular space, is supported by a plurality of pipes 60a and 60b (see FIG. 1) attached to the crushing container, and the annulus is formed by using the pipes 60a and 60b. It is a structure that allows cooling water to pass through and drain into the space. Therefore, in the embodiment of the present invention, the raw material slurry can be cooled from the inside of the crushing container 12.

As shown in the figure, the pipes 60a and 60b preferably extend from above the crushing container 12 and support the guide ring 50 at the lower end.

The distance between the outer peripheral wall of the guide ring and the inner peripheral wall of the crushing container is preferably 10 to 50 mm. If the interval is less than the above lower limit, the movement of the media is excessively restrained, and if it exceeds the upper limit, the degree of freedom is increased too much.

The horizontal cross-sectional area of the descending passage is set smaller than the horizontal cross-sectional area of the ascending passage. As a result, the raw material slurry that has exited the upper end of the ascending passage is easily towed by the descending passage, and the pulverized media is effectively returned to the stirring member side. For this purpose, it is also effective to increase the diameter of the rotary drive shaft 46.

The height of the guide ring is preferably 2/3 to 1/2 of the height of the crushing chamber. If the height is less than the lower limit, the control of the media flow becomes insufficient, and if the height exceeds the upper limit, the smoothness of the media flow is impaired.

Inside the guide ring 50, a rectifying means 70 is provided to rectify the flow of the raw material slurry flowing in the inner portion 14a of the lower portion of the crushing chamber, which is a descending passage, and solve the uneven distribution of the crushed media in the flow. It is preferable to arrange it. As shown well in FIG. 5, the rectifying means 70 is preferably composed of rectifying plates 72, 74, 76, 78 forming a substantially cross.

In operation, the stirring member 22 is rotationally driven while introducing the raw material slurry containing the particles to be crushed, which is the raw material, from the raw material slurry supply port 16 into the crushing chamber 14. The slurry introduced into the crushing chamber 14 is moved downward in the direction of the stirring member 22 along with the slurry already formed in the crushing chamber 14 and the rotating flow of the media 30, and is stirred and mixed by the stirring member 22. .. At this time, the slurry and the media 30 are moved outward in the radial direction to the inner wall of the crushing container 12, and then the slurry and the media 30 that have been stirred and mixed are placed between the inner wall of the crushing chamber 14 and the guide ring 50. It becomes a flow f that moves up and down in the ascending passage of, and when it goes up completely, it becomes a flow that goes down.

At this time, the crushed media 30 in the slurry flying around the media separating member 32 is urged outward in the radial direction by the action of the centrifugal force of the auxiliary media separating member 40, so that the vicinity of the media separating member 32 The density of the crushed media in the above is reduced, the distribution of the crushed media can be made uniform, and the separating action of the media separating member is remarkably improved.

10 Media stirring type crusher 12 Crushing container 14 Crushing chamber 16 Raw material slurry supply port 22 Stirring member 22a Hub 22b Blade 24 Rotation drive shaft 25 Shaft seal 30 Crushing media 32 Media separation member 32a Media separation member body 34 Rotation drive shaft 36 shaft Seal 38 Raw material outlet 40 Auxiliary media separation member 42 Rotating blade 42a Columnar member 42b Opening 46 Rotating drive shaft 50 Guide ring 52 Inner peripheral ring plate 54 Outer ring plate 56 Lower ring plate 58 Upper ring plate 60a Pipe 60b Pipe 70 Rectifying means 72,74 , 76,78 rectifying plate

Claims (7)

In a crushing container having a vertical cylindrical crushing chamber containing a bead-shaped crushing medium, a stirring member below the crushing chamber and having a rotation axis substantially coaxial with the axis of the crushing chamber, and the crushing chamber. In a media stirring crusher provided with a centrifugal media separating member provided above the stirring member, the media stirring crusher has a substantially cylindrical rotary blade that rotates around the media separating member, and is contained in a raw material slurry. An auxiliary media separating member that acts to separate the crushed media from the media separating member is provided, and the rotating blades are arranged coaxially with the stirring member and supported by a disk-shaped support member below the stirring member. A media stirring type crusher characterized in that a rotation drive shaft is extended upward coaxially with the rotation shaft of the stirring member from the stirring member, and the upper end thereof is coupled to the center of the support member. The media stirring type crusher according to claim 1, wherein the support member of the media separation member is provided with a plurality of openings for forming a circulation path of the crushed media. The media stirring type crusher according to claim 1 or 2, wherein the rotary blade is provided with a plurality of columnar members arranged at intervals around the rotary blade. The media stirring type crusher according to claim 3, wherein the columnar member has a triangular cross section having a bottom surface on the outer peripheral side and a long side on the inner peripheral side. The media stirring type crusher according to any one of claims 1 to 4, wherein the rotary blade is made of ceramics. The media stirring type crusher according to any one of claims 1 to 5, wherein the rotary blade is made of resin. A guide ring having a predetermined height is provided between the rotary drive shaft and the peripheral wall of the crushing container, and the raw material slurry in which the crushing media is dispersed between the outer peripheral wall of the guide ring and the inner peripheral wall of the crushing container. The media stirring type pulverizer according to any one of claims 1 to 6, wherein the ascending passage of the flow of the raw material is used, and the lower passage of the raw material slurry is provided between the inner peripheral wall of the guide ring and the rotary drive shaft.

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