JPS61230730A - Apparatus for treating particulate material - Google Patents

Abstract

PURPOSE:To enable the accurate mass treatment of a particulate material, by providing a first rotary plate while providing a second rotary plate having a particulate rising opening formed thereto at a position above said first rotary plate and spaced apart therefrom by a predetermined interval in a rotatable manner within a container so as to arrange both rotary plates in a plurality of stages. CONSTITUTION:The particulate material on two stages of rotary plates 2, 10 is treated in the order of centrifugal tumbling fluidization, rising, centrifugal tumbling fluidization and falling between both rotary plates 2, 10 while centrifugally tumbled and fluidized on rotary surfaces having an area about two times the rotary surface of a single rotary plate structure. During this time period, desired treatments such as granulation, coating, mixing, drying, etc., can be sequentially applied with good efficiency. For example, when a liquid is supplied to the particulate material of the upper stage particulate bed 14 from a nozzle 17, fine particles are selectively coated with said liquid and the particle size of the upper stage particulate bed 14 and that of the lower stage particulate bed 13 are uniformized to enable granulation and coating showing sharp particle size distribution.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a powder processing apparatus which is effective for mixing, granulating, coating, drying, etc. of powder and granules.

[Background technology]

In general, in the processing of powder and granular materials in various fields such as pharmaceuticals, foods, and chemical products, in order to obtain high-quality products, it is important to thoroughly (and reliably) process each powder or granule. To this end, it is desirable that the force acting on the particles being treated be as uniform as possible over all parts, and that the particles work in a circular flow.

Therefore, the inventors of the present invention conducted extensive research and found that a centrifugal flow type powder processing device that uses a rotating plate to apply a centrifugal flow effect to powder particles is suitable for precise processing of powder particles. This powder processing device is effective for granulation, coating, etc. of spherical granules, and has excellent effects (see Japanese Patent Laid-Open No. 58-202029).

By the way, when applying a centrifugal flow effect using a rotating plate,
Since the force applied to the powder is transmitted by the action of the rotating surface, the amount of powder to be processed is approximately proportional to the area of the rotating surface.

However, since a typical powder processing device has only one rotating surface, it is necessary to increase the diameter of the device in order to obtain a large rotating surface area with this structure. As a result, there are problems such as an increase in installation space, increased processing costs and labor, and the method is unsuitable for mass processing.

In addition, in order to perform precise powder and granule processing, it is desirable to sequentially perform necessary functions such as granulation, coating, mixing, and drying using a single processing device.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a powder processing technology that can obtain a large rotating surface area with a compact structure requiring a small installation space, and that can accurately process a large amount of powder or granular material.

Another object of the present invention is to provide a technique that enables sequential processing of powder and granular materials as a whole.

C. Summary of the Invention The present invention includes a first rotary plate that rotates within a container having a substantially circular horizontal cross section, and a first rotary plate that is rotatable within the container at a position spaced upwardly from the rotary plate by a predetermined distance. By arranging the second rotating plate in multiple stages, which is provided in The large rotating surface area allows for precise processing of large quantities of powder and granular materials. Furthermore, the flow is sequentially processed from the bottom rotating surface and moves to the top rotating surface, overflows from the top rotating surface and falls onto the bottom rotating surface, and then circulates from the bottom to the top. Circulating treatment is performed while forming, and various treatments such as wetting, powder dispersion, transfer, mixing, drying, etc. are performed at desired parts of the circulating flow as necessary, making it possible to perform sequential powder and granule treatment as a whole. It is something.

[Example 1] Fig. 1 is a cross-sectional view of a powder/granular material processing apparatus that is an embodiment of the present invention, and Fig. 2 (a) and ridges) are a plan view of a rotary plate and a JIB in Fig. 2 (a), respectively. -IIB line sectional view, and FIG. 3 is a plan view of another embodiment of the rotating plate.

In FIG. 1, at the bottom of a processing container 1 having a substantially cylindrical horizontal cross section, a substantially dish-shaped lower rotating plate 2 (first rotating plate) is attached to a rotating shaft 3 located at the axis of the processing container 1. It is attached to the upper part with a frustoconical member 4 and mounting bolts 5, and the rotating plate 2 forms the bottom surface of the processing container 1. The dish-shaped curved surface of the lower rotary plate 2 fits smoothly with the curved surface around the bottom of the processing container 1, and the rotation of the zero-rotation shaft 3, which forms a smooth continuous curved surface through the annular slit 6, is controlled by the motor. 7, and as the rotating shaft 3 rotates, the lower rotating plate 2 is also rotated together.

An air supply part 8 is attached below the processing container l, so that heated air etc. supplied from an air supply source (not shown) is sent into the processing container l from the slintro through the air supply part 8. It is configured.

In addition, approximately in the middle of the processing container l, as shown in FIG. is provided. The upper rotating plate 10 forms a multi-stage rotating surface with the lower rotating plate 2, and both rotating plates 2 and 10 rotate together.

The upper rotary plate 10 of this embodiment has substantially the same curved surface shape as the lower rotary plate 2. An opening 11 for falling powder and granular material is formed in the center of the upper rotary plate 10, and an opening 12 (notch) for lifting powder and granular material is cut out in the radial direction at one location. The opening 12 for raising the powder and granules allows the powder and granules in the lower powder and granule layer 13 centrifugally transferred and flowed on the lower rotary plate 2 to rise above the upper rotary plate 1O as shown by the broken line arrow in the second opening). This is for forming an upper powder layer 14 which is centrifugally transferred and fluidized on the upper rotary plate 10. This upper powder layer 1
The powder and granules that overflow from 4 are transferred to opening 1 for powder and granules to fall.
2 onto the lower rotary plate 2, and after being cyclically centrifuged and fluidized again, it is dropped from the opening 12 for raising the powder and granules onto the upper rotary plate 1.
It is raised above 0 and centrifugally transferred.

That is, in this embodiment, the powder and granular material in the processing container l has a two-stage rotating surface consisting of the lower rotating plate 2 and the upper rotating plate 10, that is, the area of rotation is approximately twice that of a single rotating plate structure. Each surface is efficiently processed while being subjected to sequential centrifugal transfer flow action in a cyclical manner.

Incidentally, the openings 12 for raising the powder or granular material can be provided at three locations as shown in FIG. 2), the front edge 10a of the opening 12 in the rotating direction of the rotating plate may be inclined downward toward the rear side in the rotating direction. It is possible to improve the scooping effect.

A discharge mechanism 15 for discharging the processed powder is provided on the bottom side of the processing container l.

On the other hand, a hopper 16 for supplying powder raw material and a spray nozzle 17 for supplying binder liquid and the like are provided at the upper part of the processing container 1.

Hereinafter, the operation of the first embodiment will be explained.

First, while blowing gas such as heated or cooled air into the processing container 1 from an air supply source (not shown) through the air supply section 8 and the annular slit 6, the granular material is introduced into the processing container 1 from the hopper 16. At the same time, the motor 7 rotates the rotary shaft 3 to rotate the lower rotary plate 2 and the upper rotary plate lO, for example, in a clockwise direction.

As a result, a centrifugal flow is generated on both rotary plates 2 and 10 due to the centrifugal force and rotational force caused by the rotation of both rotary plates, and a centrifugal flow is generated on both rotary plates toward the outer circumference, that is, toward the inner wall of the container, and from the top toward the center of the container. With the descending flow pattern, powder layers 13 and 14 are formed which are centrifugally transferred as indicated by the broken line arrows in FIG. 1, respectively. Moreover, in that case, by supplying the powder and granular material to a depth at least equal to the distance between both rotary plates 2 and 10 into the processing container 1, as shown in FIG. The upper powder layer 13 comes into contact with the lower surface of the upper rotating plate 10.Thereby, the powder that has centrifugally transferred to the upper part of the powder layer 13 is transferred to the upper rotating plate 10. It is scooped up onto the upper rotary plate 10 through the lifting opening 12, and forms a powder layer 14 which is centrifugally transferred and flows on the upper rotary plate 10.

On the other hand, the powder overflowing from the powder layer 14 on the upper rotating plate 10 falls onto the lower rotating plate 2 through the powder falling opening 11, and is again caused by the rotation of the lower rotating plate 2. After being centrifugally transferred into the powder layer 13 by centrifugal force and rotational force, it rises through the powder lifting opening 12 onto the upper rotary plate 10 to form a centrifugally transferred powder layer 14. The particles are processed while being processed, and further overflow and fall onto the lower rotary plate 2 from the powder drop opening 11.

Therefore, in this example, the powder and granules on the two rotary plates 2°10 are centrifugally transferred and flowed on a rotating surface with an area approximately twice as large as that of a single rotary plate structure. Processed in the order of centrifugal transfer flow, rising, centrifugal transfer flow, fall, and granulation during.

Desired treatments such as coating, mixing, and drying can be performed sequentially and efficiently. For example, when liquid is supplied from the nozzle 17 to the powder in the upper powder layer 14 to moisten it, and a powder raw material is supplied from the hopper 16, the powder is transferred to the powder layer on the lower rotary plate 2. There is a tendency for the particles to be finer than those in the powder layer 13, but since the fine particles are selectively coated, the particle size in the upper powder layer 14 and the powder in the lower layer tend to be smaller. The particle size of the body layer 13 is made uniform,
Enables granulation and coating with sharp particle size distribution.

[Embodiment 2] FIG. 4 is a sectional view showing another embodiment of the powder processing apparatus according to the present invention.

In the second embodiment, the upper rotary plate 10 in the first embodiment is
Rotary plates corresponding to the above are provided in two stages as shown by 103 and 10b, supported by support columns 9a and 9b, respectively, and powder layers 14a and 14b are independently formed on each. Therefore, with the three stages of rotating surfaces including the lower rotating plate 2, more efficient powder and granular material processing is possible with the rotating surface having an area approximately three times larger than that of a single rotating plate structure.

In the second embodiment, the bottom surface of the processing container 1 itself is separately formed below the flat plate-shaped lower rotary plate 2, and between this bottom surface and the lower rotary plate 2 there is a feeder formed on the rotary shaft 3. Gas for purging, etc. is ejected through the air passage 18, and an air supply pipe 19 is connected to a position slightly above the lower rotary plate 2 of the processing container 1, and supplies the powder layer 13 from an air supply source (not shown). The device is configured to supply gas such as air into the device. Further, although a humidity sensor 20 is provided to automatically sense the humidity of the powder layer 13 at the bottom stage, humidity sensors 20 are also provided at the middle and top powder layers 14a and 14b. Good too.

[Embodiment 3] FIG. 5 is a sectional view showing still another embodiment of the present invention.

In the third embodiment, a stirring member 21 is attached to the rotating shaft 3 between the bottom surface of the processing container 1 and the lower rotating plate 2.

Therefore, the stirring member 21 can stir the granular material to further enhance the mixing effect.

[Embodiment 4] FIG. 6 is a sectional view showing still another embodiment of the present invention.

In this embodiment 4, the rotating shaft 3 is suspended from above the processing container 1 toward the axis, and the lower rotating plate 2 is attached to the lower end thereof.

Further, ventilation holes 22.23 are formed in the bottom of the lower rotating plate 2 and the processing container l, respectively, and gas from the periodic part 8 passes through these ventilation holes 23.22 and the annular slit 6 into the processing container 1. The drying effect and fluidization effect can be further enhanced.

Note that the present invention is not limited to the above embodiments (
Various other variations are possible.

For example, the processing container may have a conical shape or an inverted conical shape, and the rotating plate may have four or more stages.

Furthermore, the present invention is applicable to powder and granular materials used in medicines such as tablets, fine granules, granules, capsules, foods such as chocolate, powder metallurgy catalysts, ferrites, ceramics, detergents, cosmetics, dyes, pigments, etc. Widely applicable to granulation, coating, drying, mixing, etc.

〔effect〕

(1) a first rotating plate that rotates within a container having a substantially circular horizontal cross section; and at least By arranging a second rotary plate in multiple stages with an opening for raising the powder and granular material in one place, the area of the rotating surface increases, allowing efficient and precise processing of large amounts of powder and granular material. can do.

(2) Also, according to (11) above, it is possible to sequentially perform the desired processing on each rotating surface, so the rotation surface is sequentially moved from the lowest rotating surface to the highest rotating surface, and the overflow from the highest rotating surface is prevented. It can be dropped onto the rotating surface of the lowest stage, and then circulated while forming a circulating flow from the lowest stage to the highest stage.Wetting, powder scattering, and rolling can be carried out at desired parts of the circulating flow as necessary. , granulation, coating, mixing, drying, etc., and overall sequential powder and granule processing can be obtained using seven processing devices.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a powder/granular material processing apparatus that is an embodiment of the present invention, and FIG. FIG. 3 is a plan view of another embodiment of the rotary plate, FIG. 4 is a sectional view showing another embodiment of the granular material processing apparatus according to the present invention, and FIG. 5 is a plan view of another embodiment of the present invention. 6 is a cross-sectional view showing still another embodiment of the present invention. 1... Processing container, 2... Lower rotating plate (first rotating plate), 3... Rotating shaft , 4... truncated conical member, 5... mounting bolt,
6...Slit, 7...Motor, 8...
Air supply part, 9.9a, 9b... Support column, 10... Upper rotating plate (second rotating plate), 10a, 10
b--Rotating plate, 11... Opening for powder/granular material falling, 12... Opening for powder/granular material rising, 13... Lower powder/granular material layer, 14... Upper powder/granular material layer, 14a , 14b--Powder layer, 15... Discharge mechanism, 16... Hopper, 17...
・Spray nozzle, 18...Air supply path, 19...Air supply pipe, 20...
- Humidity sensor, 21... Stirring member, 22.23... Ventilation hole.

Claims (10)

[Claims] (1) a first rotating plate that rotates within a container having a substantially circular horizontal cross section; and at least A powder and granular material processing device comprising a second rotary plate having an opening for raising the powder and granular material arranged in multiple stages. (2) The second rotary plate is a substantially donut-shaped disc having an opening for falling powder and granular material formed on the center side in the radial direction, and an opening for raising the powder and granular material on the outer peripheral side in the radial direction. A granular material processing apparatus according to claim 1, characterized in that: (3) The granular material processing apparatus according to claim 1, wherein the second rotary plate is formed in multiple stages. (4) The granular material processing apparatus according to claim 1, wherein the second rotary plate is supported by a support on the first rotary plate. (5) The granular material processing apparatus according to claim 1, wherein the first rotary plate and the second rotary plate are rotated about the same rotation axis. (6) The granular material processing apparatus according to claim 5, wherein the rotating shaft extends into the container from above the container. (7) The granular material processing apparatus according to claim 5, wherein stirring blades extending radially outward are attached to the rotating shaft in a substantially horizontal direction. (8) The granular material processing apparatus according to claim 1, wherein the first rotary plate constitutes a bottom surface of the container. (9) The granular material processing apparatus according to claim 1, wherein the opening for raising the granular material in the second rotary plate is a notch formed in the radial direction. (10) The front edge of the notch of the second rotary plate in the rotary plate rotation direction is inclined downward toward the rear side in the rotation direction. Powder processing equipment.