JPH0534753Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is applicable to mixtures in which a dispersoid is mixed with a viscous (slime-like) dispersion medium, such as ink, paint, magnetic paint for magnetic recording media, etc. The present invention relates to a dispersion machine for uniformly dispersing the dispersoid in a dispersion medium.

[Prior Art] A conventional dispersion machine used for the above-mentioned mixture is shown in FIGS. 4 and 5. As shown in FIG. 4, a shaft 6 rotatably driven by a motor 5 is disposed in a cylindrical container 4, and a stirring plate 7,
7 are fixed at regular intervals. As shown in FIG. 5, the stirring plates 7, 7, . . . have a groove 13 extending spirally from the center.

The container 4 has an inlet 14 at the lower part and an outlet 15 at the upper part, and a screen 20 is provided in front of the outlet 15. The mixture of dispersion medium and dispersoid is sent from the tank 2 side through the duct 12 to the pump 3, where it is given a pressure of about 0.3 to 5.0 Kg/cm ² , and is then sent through the duct 11 from the inlet 14 to the container. 4 is pressurized and introduced.

In the container 4, about 40 to 90% of the volume of the container is stored with fine granular media having a particle size of 0.5 to 3 mm. This media includes the stirring plates 7, 7...
passes through the kerf 13, but does not pass through the screen 20.

In this disperser, the mixture pressurized and introduced into the container 4 from the introduction port 14 is stirred and mixed together with the media by the rotation of the stirring plate 7, so that the dispersoid is gradually and uniformly dispersed in the dispersion medium. Spread.
Furthermore, in addition to the action of the rotation of the stirring plate 7, this mixture is pushed by the mixture fed under pressure from the inlet 14 and gradually rises inside the container. At this time, by passing the media together with the grooves 13 of the stirring plate 7, the mixture is agitated and the dispersoids are more uniformly dispersed in the dispersion medium. After the mixture is separated from the media by the screen 20, it is taken out of the container 1 from the outlet 15.

In order to perform efficient and high-capacity dispersion in this dispersing machine, it is necessary to satisfy various conditions, but in particular, the media must be almost uniformly dispersed in the mixture in the container 4. This is very important.

Conventionally, various measures have been taken to prevent the media from being unevenly distributed in a specific location in the container 4, such as appropriately selecting the specific gravity of the media relative to the mixture, the pressure at which the mixture is introduced into the container 4, etc. Measures have been taken to harmonize the number of rotations of the stirring plate 7 and the pressure at which the mixture is introduced.

However, no matter how well the conditions are adjusted for mixing and dispersion, changes in the rheological properties of the mixture tend to cause the media to settle downward in the mixture, and the media tends to be biased toward the bottom of the container.
Therefore, if the dispersing machine continues to operate, a difference in the distribution of the media inevitably arises between the upper and lower sides of the container, and this becomes larger. For this reason, the dispersion ability of the disperser gradually decreases.

Therefore, as shown in Figures 4 and 5,
A dispersion machine has also been proposed in which screen plates are arranged on both sides of the stirring plate 7 to allow only the mixture to pass through but not the media, thereby partitioning the inside of the container 4 into a plurality of chambers 16 (Japanese Unexamined Patent Publication No. 157321/1983). Public bulletin).

In this disperser, the inner circumferential side of the screen plate 8 is a bearing 22 to rotatably support the shaft 6, and the outer circumferential side of the screen plate 8 is made of synthetic resin materials such as fluorine resin and neoprene, copper, etc. A gasket 23 made of a metal material such as gunmetal, a natural resin material such as wood, etc. was tightly attached to the inner peripheral surface of the container 4.

[Problem that the invention aims to solve] However, the media placed inside the container is
The particles are minute particles with a diameter of 0.5 to 3 mm, and the inner circumferential side of the screen plate 8 slides against the rotating shaft 6, so if media enters between them, the shaft 6 will wear out and the shaft will become damaged. There is a problem that normal rotation of 6 is impaired. Further, due to this wear, the screen plate 8 could no longer prevent the passage of the media, resulting in a problem that media leakage occurred.

In view of the above-mentioned conventional problems, the present invention prevents wear between the inner peripheral part of the screen plate and the shaft, ensures tightness of that part over a long period of time, and maintains normal operation for a long time. The purpose is to provide a disperser that can

[Means for Solving the Problems] In other words, in order to solve the above problems, the means adopted in the present invention is a container 4 equipped with an inlet 14 for introducing the mixture under pressure and an outlet 15 for discharging the mixture; A shaft 6 inserted into the container 4 and driven to rotate; a stirring plate 7 attached to the shaft 6 for stirring the mixture and granular media in the container 4; A viscous mixture dispersion machine comprising a screen plate 8 which is partitioned into a plurality of chambers 16 including a plate 7, and which allows only the mixture to pass through and blocks the passage of media,
The screen plate 8 has a boss portion 8c that is rotatably fitted into the shaft 6.
is surrounded by a cup-shaped ring case 22 fitted into the shaft 6.

[Function] In the dispersing machine, the screen plates 8, 8 are fitted into the shaft 6 at the boss portion 8c which becomes thicker, and are fitted into the shaft 6 so as to be relatively rotatable.
Since c is covered with the cup-shaped ring case 22, it is difficult for the mixture to enter the sliding part between the screen plates 8, 8 and the shaft 6, and the media is also prevented from leaking there. Therefore, wear of the sliding portion due to the mixture is prevented. In addition, even if it wears out, it is protected by the ring case 2, so stable operation can be maintained for a long period of time.

[Example] Next, an example of the present invention will be described in detail with reference to the drawings.

As shown in FIG. 1, a cylindrical container 4 is installed on a frame 1, and a shaft 6 rotated by a motor 5 is inserted into the container 4. As shown in FIG. Stirring plates 7, 7... are fixed to this shaft 6 at regular intervals via spacers 9, 9....
As shown in FIG. 2, the stirring plates 7, 7, . . . have a groove 13 extending spirally from the center.

In the illustrated embodiment, uneven lines 21a are formed on the inner periphery of the stirring plate 7 by knurling or the like, and the uneven lines 21a are matched to the uneven lines 21a at each interval at which the stirring plate 7 is fixed to the shaft 6. The rotation of the motor 5 is transmitted to the stirring plates 7, 7, . . . through the shaft 6 by meshing with each other.

The container 4 is provided with an inlet 14 at the lower part and an outlet 15 at the upper part, and the mixture of the dispersion medium and the dispersoid is sent to the pump 3 through the tank 2 side or the duct 12, where the concentration of 0.3 to 5.0 A pressure of about Kg/cm ² is applied to the container 4 from the introduction port 14 through the duct 11.
is pressurized and introduced into the

Furthermore, inside the container 4, a screen plate 8,
8... vertically partitions the room into a plurality of rooms 16, 16.... This point will be explained in detail with reference to the drawings.

Various configurations of the screen plate 8 are shown in FIGS. 2 and 3. The screen plate 8 shown in FIG. 2 is a disk having a large number of circular holes 8a, 8a, . . . , and the diameters of the holes 8a, 8a, . . . are set smaller than the diameter of the media. In FIG. 3a, a large number of slit-like through holes 8b, 8b, . . . are formed in a disc, and the width of the slit-like through holes 8b, 8b, . Figures b and c show the slit-shaped through holes 8b, 8b... opened concentrically, and the slit-shaped through holes 8b, 8b shifted vertically and horizontally and expanded in the same direction, respectively. .

These disk-shaped screen plates 8, 8...
As shown in the figure and FIG. 2, it has a cylindrical boss portion 8c that becomes thicker in the center, and is rotatably fitted into the shaft 6 into which spacers 9 are fitted. Furthermore, cup-shaped ring covers 22, 22 are rotatably fitted into the shaft 6 from above the spacer 9 is fitted, and a pair of upper and lower ring covers 22, 2 that face each other are fitted into the shaft 6.
2 covers the boss portion 8c. Note that the tip of the shaft 6 is fixed by tightening a bolt 19.

The outer circumferential sides of the screen plates 8, 8... are held between spacers 10, 10... fitted in the cylindrical container 1 so as to be inscribed therein, at the same intervals as those fixed to the shaft 6. There is. As is clear from the above configuration, the stirring plates 7, 7, . . . are rotationally driven by the motor 5, but the screen plate 8 is not rotated and remains stopped.

[Effects of the invention] As explained above, the disperser according to the invention has the following effects:
Since media does not enter between the sliding part of the screen plate 8 and the shaft 6, abrasion of that part is prevented, and even if it is worn, the ring cover 2
2 and 22 prevent media from leaking, which has the effect of maintaining stable operation over a long period of time.

[Brief explanation of the drawing]

Figure 1 is a piping and cross-sectional view of a disperser showing an embodiment of the present invention, Figure 2 is an exploded perspective view showing the main components of the disperser, and Figure 3 is a cross-sectional view of the disperser used in the disperser. Perspective views showing various configurations of the screen plate, No. 4
The figure is a piping/cross-sectional view of a dispersing machine showing a conventional example,
The figure is an exploded perspective view showing the main components of the disperser. 4... Container, 6... Shaft, 7... Stirring plate,
8...Screen board, 14...Introduction port, 15...
Exhaust port, 16...Divided room.

Claims (1)

[Scope of utility model registration request] A container 4 equipped with an inlet 14 for introducing a mixture under pressure and an outlet 15 for discharging the mixture, and a shaft 6 inserted into the container 4 and driven to rotate.
and a stirring plate 7 attached to this shaft 6 to stir the mixture in the container 4 and the granular media.
and a screen plate 8 which partitions the inside of the container 4 into a plurality of chambers 16 including the stirring plate 7 and allows only the mixture to pass through and prevents the passage of media. 8
is a viscous mixture dispersion characterized in that it has a boss portion 8c rotatably fitted into the shaft 6, and this boss portion 8c is surrounded by a cup-shaped ring case 22 fitted into the shaft 6. Machine.