JP3354335B2 - Dispersion mixing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dispersion mixing apparatus for dispersing solid fine particles suspended in a slurry. The present invention particularly relates to a dispersion mixing apparatus which is effective when applied to dispersion mixing of paints, inks, ceramic raw materials, pigments, and the like. More specifically, the present invention involves inserting a basket filled with a dispersion medium such as glass beads into a cylindrical tank containing the slurry, and circulating the slurry through the basket while stirring the dispersion medium in the basket. The present invention relates to a dispersion and mixing apparatus for dispersing a suspension in a slurry.

[0002]

2. Description of the Related Art As a conventional dispersion mixing apparatus of the type described above, for example, as described in Japanese Patent Publication No. 62-16687, a basket is held in a state in which it is not rotated in a tank,
There is an apparatus of a type that imparts motion to a dispersion medium in a basket by rotating a stirring member provided in the basket. In this known type of dispersing and mixing apparatus, since the basket is fixed, there is no active means for circulating the slurry through the basket, and the circulation of the slurry is poor. In order to make up for this drawback, it is conceivable to provide a circulation blade below the basket or to provide a stirrer in the tank, but none of them can achieve a sufficient dispersion speed. In addition, heat generated by stirring during dispersion is large,
The work must be interrupted for cooling. Further, washing is necessary to disperse different types of slurries, but washing is troublesome in the case of a fixed basket. On the other hand, when the basket is configured to be driven to rotate, the dispersion medium in the basket is pressed against the inner surface of the basket by centrifugal force, and rotates together with the basket by the frictional force with the basket. By providing a non-rotating braking member inside the basket, the braking member prevents movement of some dispersing media, resulting in a speed difference between the dispersing media and shearing of the slurry present between the media. Dispersion is achieved.

[0003]

In the above-mentioned known dispersion mixing apparatus, the basket does not rotate, so that the dispersion speed is low and the washing of the basket is troublesome. Further, in a device of the type that drives the basket in rotation, there is a tendency that slippage occurs between the inner surface of the basket and the dispersion medium, and the speed of the dispersion medium is lower than the speed of the basket, and the shearing force is reduced by that much, so that the dispersion There is a problem that the speed cannot be made sufficiently high, and there is a problem that the inner surface of the peripheral wall of the basket is worn due to slippage of the dispersion medium to shorten the life of the basket. Further, when the holes in the peripheral wall of the basket are formed by punching, the size of the holes is inevitably increased, and a small-sized dispersion medium cannot be used. It costs. SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, to obtain a dispersion mixing device which can achieve a high dispersion speed, is easy to clean, and has a long basket life.

[0004]

Means for Solving the Problems To solve the above problems, the present invention employs a configuration in which the basket is driven to rotate in the tank. A braking member, which is prevented from rotating, is provided in the basket to prevent the movement of a part of the dispersion medium in the basket. Further, a plurality of protrusions are provided on the inner surface of the peripheral wall of the basket so as to protrude inward in the radial direction. With this projection, the speed difference between the inner peripheral surface of the basket and the dispersion medium is eliminated, and the dispersion efficiency can be increased. That is, the dispersion mixing apparatus according to the present invention includes a cylindrical tank for storing the slurry, a cylindrical basket rotatably supported in the cylindrical tank, a peripheral wall formed of a porous member, and containing a dispersion medium therein. A braking member disposed in the cylindrical basket and held in a stationary state by a braking means; and a driving means for rotating and driving the cylindrical basket. An opening for slurry circulation is formed in at least one of the upper wall and the lower wall of the cylindrical basket, and the slurry in the cylindrical tank is circulated through the basket by rotating and driving the cylindrical basket. Disperse the suspension. As a feature of the present invention, a plurality of protrusions for preventing the dispersion medium in the basket from slipping are formed on the inner peripheral surface of the cylindrical basket so as to project radially inward.

[0005] In the apparatus of the present invention, it is preferable to form openings for slurry circulation in both the upper wall and the lower wall of the cylindrical basket. In this case, the inner surfaces of the upper wall and the lower wall have the inside of the basket. It is preferable that a plurality of protrusions for preventing the dispersion medium from sliding are formed so as to protrude into the basket. The braking member is provided on a braking shaft that passes through the upper and lower walls of the cylindrical basket and is fixed to the upper and lower walls. It is preferable to provide an impeller for regulating the flow. With this structure, circulation of the slurry into the basket is promoted, and the dispersion speed can be increased. In a further preferred aspect of the present invention, a plurality of protrusions for suppressing the movement of the dispersion medium are formed on the upper and lower surfaces of the braking member so as to protrude vertically. Also, a plurality of stirring members for stirring the slurry are formed on the outer surface of the peripheral wall of the cylindrical basket so as to protrude outward in the radial direction. Further, it is preferable that the braking means of the braking member is configured as a means for holding the braking member in a releasable manner. In this case, the braking member is rotatable when the braking means is in the released state. The peripheral wall of the cylindrical basket is preferably formed by a screen having a large number of slits whose cross-sectional shape decreases radially outward. With this structure, it is possible to increase the dispersion speed by reducing the slit width of the basket peripheral wall and using a small dispersion medium. The braking member may be provided with a cooling means for circulating the refrigerant, and the basket is desirably movable in the vertical direction in the tank.

In the above-described structure, the basket is rotatable. Therefore, when the basket is rotated at the time of washing, the internal residue is discharged from the basket by centrifugal force, and the washing can be easily performed. In this case, if the braking member can be freely rotated, cleaning can be performed in a short time without any trouble in cleaning. Further, when this apparatus is used as a slurry stirrer, the braking member is rotatable while the slurry solvent is placed in the tank, and the solid fine particles are charged while rotating the basket. After the slurry in which the solid fine particles are suspended is thus formed, the apparatus of the present invention can be used as a dispersion apparatus. Further, in another aspect of the present invention, the dispersion mixing device is provided with a braking member driving unit that rotationally drives the braking member. In this structure, by driving the braking member at a different speed or a different direction from the basket, a speed difference is given to the dispersion medium, and the dispersion effect can be enhanced.

[0007]

An embodiment of the present invention will be described below with reference to the drawings. First, referring to FIG. 1, the dispersion mixing apparatus of the illustrated embodiment includes a tank 1 containing solid fine particles such as paints, inks, ceramic raw materials, or pigments in a suspended state. An elevating mechanism 2 is arranged on the side of the tank 1, and a basket driving mechanism 4 is supported on an elevating shaft 3 that is extended and contracted by the elevating mechanism 2. FIG. 2 shows the internal structure of the basket drive mechanism 4. The basket driving mechanism 4 includes a vertical hollow shaft 6 rotatably supported by bearings 5a and 5b of a bearing housing 5 provided in a housing 4a. Vertical hollow shaft 6
Extends vertically downward from the bearing housing 5 and has a basket 7 fixed to the lower end. A pulley 8 having a V-shaped groove is fixed to an upper end of the vertical hollow shaft 6, and a V-belt 9 wound around the pulley 8 is connected to an output shaft of a motor 10 mounted on a housing 4a as shown in FIG. The rotation of the motor 10 is transmitted to the pulley 8 to rotate the vertical hollow shaft 6. Basket 7 consists of upper wall 7a and lower wall 7
b, and a cylindrical peripheral wall 7c. The lower end of the vertical hollow shaft 6 is fixed to the upper wall 7a of the basket. The upper wall 7a is provided with a slurry inlet 7d at a position radially inward, and the lower wall 7b is provided with a number of radial slits 7e as shown in FIG. The basket 7 is filled with a dispersion medium 7f such as glass beads.

A braking shaft 11 is provided through the vertical hollow shaft 6. The brake shaft 11 is rotatably supported by bearings 6a and 6b arranged in the hollow shaft 6. Braking axis 1
1 supports a rod-shaped braking member 12 in the basket 7.
The upper end of the brake shaft 11 projects upward from the hollow shaft 6, and a disk-shaped brake plate 13 is fixed to the upper end. A braking device 14 is provided facing the braking plate 13. This braking device 14
Is composed of a fixed member 14a fixed to the housing 4a and a movable member 14b swingably supported by a fulcrum 14c. When the movable member 14b swings, both members 14a, 14a
The tip of b applies a braking force to the brake plate 13 with the brake plate 13 sandwiched from both sides. A pneumatic cylinder 14d is provided to swing the movable member 14b. The peripheral wall 7c of the basket 7 is a screen having a mesh structure in which a metal wire having a special cross-sectional shape is wound around a cylinder and the gap between the wires is fixed by welding. As shown in FIG. The cross-sectional shape is such that the cross-section is reduced. This structure
By reducing the passage resistance of the slurry and allowing a large amount of slurry to flow, the size of the dispersion medium such as glass beads filled in the basket 7 can be reduced by reducing the slit width. Dispersion efficiency can be increased.

On the inner surface of the peripheral wall 7c of the basket 7, a plurality of projections 15 projecting inward in the radial direction are provided at intervals in the circumferential direction. The projection 15 is an elongated plate-shaped metal member, is arranged to extend in the axial direction of the basket 7, and is welded to the peripheral wall 7c of the basket 7. A plurality of projections 16 are provided on the lower wall 7 b of the basket 7 so as to project into the basket 7. This projection 16
As shown in FIG. 3, the basket 7 is formed at a predetermined radial position from the center of the basket 7 at equal intervals in the circumferential direction. Similarly,
A projection 17 is also provided on the inner surface of the upper wall 7a of the basket 7 so as to project into the basket 7. Even if this projection 17 is provided at a position corresponding to the projection 16 on the lower wall 7b,
May be provided at a position irrelevant to the above. The braking member 12 may be configured as a perforated disk, and is provided with a projection 18 for braking that projects vertically. The peripheral wall 7 of the basket 7
Stirring members 19 are fixed to the outer surface of c at appropriate circumferential intervals. As can be seen from FIG. 1, the stirring member 19 is fixed to the peripheral wall 7c with a mounting angle inclined with respect to the central axis of the basket 7. Therefore, when the basket 7 is inserted into the slurry in the tank 1 and rotated, the stirring member 1
By the action of No. 9, an upward flow is generated in the slurry as shown in FIG.

A lower end of the brake shaft 11 passing through the vertical hollow shaft 6 projects from the lower wall 7b of the basket 7, and a flow restricting plate 20 is fixed to the lower end. The flow regulating plate 20 is attached at an appropriate twist angle with respect to the shaft 11, and acts to regulate the flow direction of the slurry flowing out of the slit 7e of the lower wall 7b of the basket 7. In the operation of the dispersion mixing apparatus according to the above-described embodiment, the tank 1 containing the slurry is placed at a predetermined position below the basket 7 with the lifting mechanism 2 being operated and the basket driving mechanism 4 being raised, and the basket 7 is lowered and inserted into the slurry in the tank 1. Here, the braking device 11 is operated to fix the braking shaft 11, and the basket 7 is rotationally driven by the motor 10. The slurry in the basket 7 flows radially outward due to centrifugal force and flows out of the hole in the peripheral wall 7c of the basket 7. The dispersion medium 7f in the basket 7 has a peripheral wall 7c.
Near the peripheral wall 7c due to the action of the projection 15. On the other hand, since the dispersion medium 7f adjacent to the braking member 12 is prevented from moving, a relative slip occurs between the dispersion media, and the slurry between the mutually sliding media is subjected to a shearing force to disperse the solid fine particles. Here, when the projections 17 and 16 are provided on the upper wall 7a and the lower wall 7b of the basket 7, the dispersion medium 7f is driven by the function of the projections, so that the dispersion efficiency is further enhanced. Further, the projections 18 provided on the braking member 12 achieve the function of preventing the movement of the dispersion medium 7f, and promote relative slip between the mediums 7f. The stirring member 19 provided on the outer periphery of the basket 7 and the flow regulating plate 20 provided at the lower end of the brake shaft 11 cause the slurry to flow in the tank 1 as shown in FIG. By operating the elevating mechanism 2 during operation and moving the basket 7 at an appropriate speed in the vertical direction, the dispersion speed is further increased.

FIG. 4 shows the effect of the projection provided on the inner surface of the peripheral wall 7c of the basket 7 in the apparatus of the present invention. As is clear from the drawing, the provision of the protrusions can increase the speed of decreasing the average particle diameter of the solid fine particles in the slurry, that is, the speed of dispersion. When the basket 7 is to be washed, the braking device 14 is released, and the braking shaft 11 is freely rotatable. When the basket 7 is rotationally driven in this state, the washing liquid circulates from the tank 1 into the basket 7 and is discharged from the peripheral wall 7c of the basket 7 to the tank 1 by the action of centrifugal force. By this action, cleaning can be completed in a short time. FIG. 5 shows a driving mechanism according to another embodiment of the present invention. In this embodiment, portions corresponding to those of the previous embodiment are denoted by the same reference numerals, and description thereof is omitted. In this embodiment, a second pulley 21 is fixed to the upper end of the brake shaft 11, and a belt 22 is wound around the pulley 21. The belt 22 is connected to an output shaft of a motor (not shown) and is driven by the motor. In this embodiment, the braking shaft 11 is driven at an appropriate speed lower than the hollow shaft 6 or
Alternatively, the dispersing effect can be enhanced by driving the hollow shaft 6 in the opposite direction. In this structure, the brake shaft 1
Since the flow restricting plate attached to the lower end of 1 is also driven, the slurry circulation action is further strengthened.

FIG. 6 shows another embodiment of the braking shaft. The brake shaft 11 is formed hollow, and has a pipe 23 inserted therein. The braking member 12 is also formed to be hollow, and has a return channel 25 formed therein by a partition plate 24. The lower side of the flow path 25 communicates with the lower end of the pipe 23 through a communication passage 26, and the upper side of the flow path 25 communicates with a return passage 28 formed between the shaft 11 and the pipe 23 through a communication passage 27. The upper end of the pipe 23 is connected to a cooling water inlet 29, and the upper end of the return passage 28 is connected to a cooling water outlet 31 via a connection fitting 30. The cooling water inlet 29 and the connection fitting 30 are connected to the shaft 11 by a rotary joint. Therefore, the shaft 11 can rotate independently of the cooling water inlet 29 and the connection fitting 30. With this structure, it is possible to cool the braking member 12 by passing the cooling water during operation.

[0013]

According to the present invention, the basket filled with the pulverizing medium is rotationally driven in the tank containing the slurry, and the projection is formed on the inner surface of the peripheral wall of the basket, so that the slip between the peripheral wall of the basket and the pulverizing medium is suppressed. This increases the crushing effect and reduces basket wear. Basket 7
The projections provided on the upper and lower walls and the projections provided on the braking member 12 facilitate this action. Further, the apparatus of the present invention can easily perform basket cleaning.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an entire dispersion mixing apparatus according to an embodiment of the present invention.

FIG. 2 is a sectional view showing details of a basket and a driving mechanism thereof in the embodiment of FIG.

FIG. 3 is a plan view showing the shape of the bottom surface of the basket.

FIG. 4 is a table showing the effect of the protrusion according to the present invention.

FIG. 5 is a sectional view showing another embodiment of the basket driving mechanism.

FIG. 6 is a sectional view showing another embodiment of the braking shaft.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B01F 1/00-5/26 B01F ⁷ /00-7/32 B01F 15/00-15/06

Claims (10)

(57) [Claims] 1. A cylindrical tank for storing a slurry, a cylindrical basket rotatably supported in the cylindrical tank and having a peripheral wall formed of a porous member and storing a dispersion medium therein, and the cylindrical basket. A braking member that is disposed inside and that is held stationary by a braking unit; and a driving unit that rotationally drives the cylindrical basket; and at least one of an upper wall and a lower wall of the cylindrical basket. Is a dispersion mixing device in which an opening for slurry circulation is formed, and the slurry in the cylindrical tank is circulated through the basket by rotating and driving the cylindrical basket, thereby dispersing a suspension in the slurry. A plurality of protrusions for preventing slippage of the dispersion medium in the basket are provided on the inner peripheral surface of the cylindrical basket in a radial direction. Dispersing and mixing apparatus being characterized in that formed so as to protrude inwardly. 2. The dispersion mixing apparatus according to claim 1, wherein openings for slurry circulation are formed in both an upper wall and a lower wall of the cylindrical basket, and an inner surface of the upper wall and the lower wall has A dispersion mixing device, wherein a plurality of projections for preventing the dispersion medium in the basket from slipping are formed so as to protrude into the basket. 3. The dispersion mixing apparatus according to claim 2, wherein said braking member penetrates through upper and lower walls of said cylindrical basket and is rotatably mounted on said upper and lower walls. A dispersing / mixing device provided on an upper side, wherein the braking shaft includes a flow regulating plate which regulates a flow of slurry at a portion extending downward through a lower wall of the basket. 4. The dispersion mixing apparatus according to claim 1, wherein upper and lower surfaces of the braking member include:
A dispersion mixing apparatus, wherein a plurality of protrusions for suppressing the movement of the dispersion medium are formed so as to protrude vertically. 5. The dispersion mixing apparatus according to claim 1, wherein a plurality of agitating members for agitating the slurry on the outer surface of the peripheral wall of the cylindrical basket are directed outward in the radial direction. A dispersion mixing device characterized by being formed so as to protrude from the device. 6. A dispersion mixing apparatus according to claim 1, wherein said braking means of said braking member is means for holding said braking member releasably, and said braking member is a braking means. A dispersing / mixing device, which is rotatable when is in a released state. 7. The dispersion mixing apparatus according to claim 1, wherein the peripheral wall of the cylindrical basket is formed by a screen having a number of holes whose cross-sectional shape decreases radially outward. A dispersion mixing device characterized by being formed. 8. The dispersion mixing apparatus according to claim 1, wherein cooling means for circulating a refrigerant is provided in the braking member. 9. The dispersion mixing apparatus according to claim 1, further comprising means for vertically moving the basket in the tank. . 10. A cylindrical tank for storing a slurry, a cylindrical basket rotatably supported in the cylindrical tank and having a peripheral wall formed of a porous member and storing a dispersion medium therein, and the cylindrical basket. A braking member, a basket driving unit that rotationally drives the cylindrical basket, and a braking member driving unit that rotationally drives the braking member, at least one of an upper wall and a lower wall of the cylindrical basket. On one side, an opening for slurry circulation is formed, and the slurry in the cylindrical tank is circulated through the basket by rotating and driving the cylindrical basket and the braking member at different speeds or different directions. The suspension in the basket is dispersed, and the inner peripheral surface of the cylindrical basket is Dispersing and mixing apparatus being characterized in that formed so as to project a plurality of projections for preventing slippage of the medium radially inwardly.