JPH0587293B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a granulation and coating device.

[Prior art]

Conventionally, various granulation methods and coating methods are known for forming pharmaceuticals, foods, electronic component materials such as ferrite, and other granular materials.

One of them is granulation and coating using a fluidized bed granulation dryer. Granulation using this fluidized bed granulation/drying device involves sending air into the raw material powder from below to form a vertically moving air flow (fluidized bed) in the granulation chamber. The raw material powder is also moved up and down, and granulation is performed by supplying the binder.

In the case of granulation using this fluidized bed granulation/drying apparatus, the granules formed are aggregates, amorphous, and only light. In addition, the particle size varies widely within the range of 0.1 to 2.0 mm, and particles of uniform particle size cannot be obtained. Regarding coating, although film coating is possible, it has the disadvantage that a good coating cannot be obtained because the coating liquid is blown away by the air flow from below. This is not possible with powder coating because the powder will fly off.

Another conventional granulation device is a stirring granulation device. In other words, granulation is performed by rotating a stirring blade, and the raw material powder is supplied and the binder is atomized while being stirred by the stirring blade to perform granulation. In this case, relatively spherical aggregates and heavy aggregates can be obtained. Moreover, the particle size is in the range of 0.1 to 2.0 mm. In the case of this stirring granulation device, it is difficult to perform drying, coating, cooling, etc.

Furthermore, rotating disk type granulators are also known. In this method, cylindrical granules are placed on a rotating disk, and the cylindrical granules are rolled, thereby forming almost identical spherical granules. . In the case of this granulator, a pre-process such as forming columnar granules in advance using an extrusion granulator is required. In addition, when forming spherical granules directly from powder without using cylindrical granules, it is necessary to use a material that has been made suitable for tightening the powder with water or a binder in advance. With this rotating disk type granulator, heavy granules that are close to true spheres are obtained, and the particle size range is 1.0 to 5.0. Although coating is possible by moistening the granulated material in advance, it is difficult to dry or cool it, and even if it is done, it takes a long time.

As mentioned above, in each conventional granulating device and coating device, the granules formed by each device have different shapes such as amorphous and spherical, and the granules are light and heavy. The products that can be obtained are limited to specific products, such as those with different densities and particle size ranges. In addition, most of the devices are capable of only specific processes, such as devices that only granulate but cannot coat, and devices that cannot dry.

[Problem that the invention seeks to solve]

The problem to be solved by the present invention is that almost all processes such as granulation, coating, drying, cooling, etc. can be performed in one device, and it is possible to carry out granulation, coating, drying, cooling, etc. with a single device, and it is possible to carry out granulation, coating, drying, cooling, etc. with a single device. The object of the present invention is to provide a granulation and coating device capable of producing particles of various sizes over a wide range.

[Means for solving problems]

The present invention includes a ventilation disc that is fixed almost horizontally to a device having a large number of communicating air circulation holes in which the opening on the bottom surface is located closer to the center than the opening on the top surface; sloping blades that allow the air to move along the air and rise in the opposite direction to the direction of movement; a blower pipe that supplies air below the ventilation disk; and an air pipe that is placed above the ventilation disk. raw material powder, coating powder supply port,
A device equipped with at least one of a spray gun for spraying a coating liquid and a spray gun for spraying a binder, in which air is blown from a blower pipe with the tilted blades stopped and carried out through the air flow passage of the ventilation disk. Granulation by annular laminar flow,
Agitation granulation by moving inclined blades without supplying air, rolling granulation by circular spiral laminar flow by moving inclined blades together with air supply, and further coating liquid spraying or coating liquid spraying. It is possible to carry out coating or film coating by supplying coating powder, drying or cooling by converting air supplied from a blower pipe into hot or cold air, and various other processes. Furthermore, by changing the moving speed of the inclined blades, the amount of air from the blast pipe, etc., it is possible to obtain granules having a desired shape, particle size, bulk density, etc.

Furthermore, in addition to the above-mentioned configuration, the granulator of the present invention is provided with blades for enhancing the granulation action, so that it is possible to carry out granulation, coating, etc. by charging a large amount of raw material compared to the volume of the granulator. It made it possible.

〔Example〕

Next, each embodiment of the present invention will be described based on the drawings. FIG. 1 is a diagram showing the entire granulation device, which is the basic configuration of an embodiment of the present invention.
2 is a granulation chamber, 2 is a back filter case, 3 is a disk support, and 4 is a ventilation disk fixed to the granulation chamber, which in this embodiment is an annular ventilation disk having a structure to be described later. Reference numeral 5 denotes a tilted blade disposed movably in the circumferential direction on the upper part of the ventilation disk 4, 6 a rotating shaft to which one end of the tilted blade 5 is fixed, 7 a bearing rotatably supporting the rotating shaft, and 8 a pulley. , a drive motor used to rotate the rotary shaft 6 using a rotation transmission means such as a belt, and thus move the inclined blades 5 along the circumferential direction around the shaft; 9 is a drive motor below the ventilation annular disk 4; Air pipe attached to 10
1 is a spray gun for supplying binder, 11 is a bag filter, 12 is a raw material inlet, 13 is a granulated material outlet, and 14 is a coating powder inlet.

Next, the ventilation annular disk used in this embodiment will be described. FIG. 2 is an enlarged sectional view of a part of the ventilation annular disk, and FIG. 3 is a plan view. In these figures, 20 is a disk-shaped substrate having a large opening 20a and fixed to the disk support 3, 21, 22, 2
3, . . . are annular plates having different diameters, and as shown in the figure, a small gap is formed between each of the annular plates 21, 22, 23, . Each of these gaps has a shape in which the upper opening is located on the outer side farther from the center than the lower opening, and the gap between them is communicated with each other by a gap running approximately horizontally. Therefore, air from below as indicated by arrow A in the drawing enters through the lower opening, flows approximately horizontally in a direction away from the center, and then exits through the upper opening.

As shown in FIG. 2, this ventilation annular disk has a substrate 20 fixed to a disk support 3, and a circular plate 21 with a diameter that gradually decreases from the largest diameter annular plate 21 on the upper surface of the substrate 20. It can be formed by attaching the annular plates 22, 23, . . .

Next, the inclined blades 5 provided on the ventilation annular disk 4 will be described. As shown in FIGS. 2 and 3, the inclined blade 5 is fixed to the rotating shaft 6 so as to be positioned above the ventilation annular disk 4, and is shaped to rise in the direction opposite to the direction of arrow B, which is the direction of movement thereof. That is, it has an inclined surface as shown in FIG.

The operation of the apparatus of the present invention having the structure described above will be described.

First, when performing a granulation method that is considered to be equivalent to a conventional fluidized bed, air is supplied from the air pipe 9 while the drive motor 8 is stopped and the rotation (circumferential movement) of the inclined plate 5 is stopped. supply. The supplied air escapes upward through the air circulation holes in the ventilation disk 4. If the raw material powder is supplied here and the binder is sprayed from a spray gun, the raw material will be flowed by the air passing through the ventilation disk. As mentioned above, in the air flow passage of the ventilation annular disk 4, the upper opening is located further away from the center than the lower opening, so the air flow through this air flow passage is also farther away from the center. It rises towards the. The airflow that has reached the wall of the granulation chamber in this way rises along the wall. The air flows further toward the center, forming an annular flow as shown in the figure. Therefore, the air flow in the present invention is different from the flow in conventional fluidized bed granulators, that is, the flow mainly in the vertical direction. Therefore, due to contact and friction between granules and between granules and powder during fluidization, it is possible to form granules that are heavier than those produced by conventional fluidized bed granulators.

Next, in order to perform agitation granulation, the supply of air from the blower pipe 9 is stopped, and the raw material supplied into the granulation chamber is stirred and granulated by rotation of the inclined blades 5.

Furthermore, in order to carry out rolling granulation, the drive motor 8
The rotation causes the shaft 6 to rotate, causing the inclined blades 5 to rotate around the shaft 6, and at the same time blowing air through the blast pipe 9. The air thus supplied flows into the granulation chamber through the gas flow passage of the ventilation annular disk 4.
This creates a flow of air that travels outward from the center on the upper surface of the ventilation annular disk 4, rises along the inner wall surface of the granulation chamber, and descends to the center as described above. As a result, the flow of the input raw material becomes an annular laminar flow.
At the same time, the movement of the inclined blades 5 causes the entire raw material to move in the circumferential direction, that is, to move in a direction perpendicular to the annular laminar flow caused by the air flow. Therefore, these flows are combined to form an annular spiral laminar flow (a flow that travels in a spiral around the center of the ventilation disk). In this way, rolling action occurs. Furthermore, the outward flow of air is increased by the centrifugal force caused by the rotation of the inclined blades, and this also increases the amount of gas ejected from the flow path of the ventilation disk, promoting annular swirl laminar flow. Rolling granulation effect is enhanced. Therefore, granules with high sphericity can be formed.

In this method, if the number of revolutions of the inclined blades is reduced, granulation is more similar to that of an annular laminar flow, and if the number of revolutions is increased, rolling granulation is performed by an annular spiral laminar flow.

In this way, by changing the rotation speed of the inclined blades 5 from zero (stop) to extremely high speed rotation and by changing the amount of air supplied from the blast pipe 9, granulation is performed by various granulation methods. Therefore, granules of various shapes and particle sizes can be formed.

In addition to the above granulation operation, coating can be performed by spraying a coating liquid or supplying a coating powder.

5 and 6 are diagrams showing a second embodiment of the apparatus of the present invention, with FIG. 5 being a plan view and FIG. 6 being a sectional view. This embodiment differs from the first embodiment in that a granulation action-enhancing blade 30 is fixedly arranged on the rotating shaft 6 on the upper part of the inclined blade 5, but otherwise has substantially the same structure. The granulation action-enhancing blades 30 have a structure that is inclined in a direction that descends from the center toward the outer periphery and rises in the direction of movement of the blades with respect to the vertical plane, that is, the direction of movement of the inclined blades 5.

In this embodiment, by providing the granulation action-enhancing vanes 30, it becomes possible to perform granulation by charging a large amount of raw material compared to the volume of the granulation chamber. In other words, when operating the drive motor 8 to rotate the shaft 6 and supplying air from the blower pipe 9 to perform granulation,
The blades 30 push down the raw material, which is blown up by the air flow and is located above, so that the movement of the inclined blades 5 is not transmitted and sufficient rolling action is not performed. Therefore, when a large amount of raw material is input, this granulation action enhancing blade 30
As a result, the raw materials located above are pushed down, and the movement of the inclined blades 5 is transmitted to all the raw materials, causing rolling action and granulation.

7 and 8 are plan views of the third embodiment, respectively.
In the cross-sectional view, the shape of the granulation action enhancing blade 31 is different. That is, as shown in the figure, it has a shape that rises from the center toward the periphery and that its tip 31a is bent downward. Also, for the vertical plane, see Figure 5.
It is inclined in the same direction as the granulation action enhancing blade 30 shown in FIG.

In this embodiment as well, a large amount of granulation can be performed at one time by the action of the blades 31. However, in the case of this embodiment, an effect of pushing down the powder and granules in the peripheral area where the rise is particularly large can be obtained.

The structure of the ventilation disk is not limited to that shown in the embodiments, but may be any structure in which the air inlet on the lower surface is located closer to the center of the disk than the air outlet on the upper surface.
For example, as shown in FIG. 9, annular plates 4 with different diameters
1, 42, . . . may be arranged stepwise with spacers 46 interposed therebetween so that each air inlet 47 is located closer to the center than each air outlet 48.

〔effect〕

According to the granulation and coating apparatus of the present invention, mixing, granulation, drying, coating (coating, coating)
etc. can all be performed with the same device. Regarding granulation, granulation can be done by various methods such as annular laminar flow granulation, agitation granulation, etc. Furthermore, granulation can be done by changing the rotation speed of the inclined blades, air flow velocity, etc. The desired shape (true sphere to amorphous), density (heavy to light), and particle size (0.05 to 2 mm) can then be granulated. Note that granulation using annular laminar flow is a granulation method that is considered to be equivalent to conventional fluidized bed granulation, but is an improved method. In other words, in the case of granulation using this annular laminar flow, particles having an irregular shape and uniform size can be obtained, which is an improvement over the case of fluidized bed granulation, which has irregular particle sizes. Furthermore, by providing a granulation action-enhancing blade, the amount of raw material charged can be greatly increased.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing the overall structure of the device of the present invention, FIGS. 4 is a view of the inclined blade viewed from the direction of the arrow in FIG. 2, FIGS. 5 and 6 are a plan view and a sectional view of the second embodiment, FIGS. 7 and 8 are the third embodiment, FIG. 9 is a sectional view of another example of the ventilation disk. 1... Granulation chamber, 4... Ventilation annular disk, 5... Inclined blade,
9... Air pipe, 10... Spray gun, 12... Raw material input port.

Claims (1)

[Scope of Claims] 1. A ventilation disc fixed in a granulation chamber having an air flow path in which the opening on the lower surface is located closer to the center than the opening on the upper surface, and a ventilation disc rotatably arranged on the ventilation disc. a ventilation pipe provided at the lower part of the ventilation disk; a raw material inlet provided on the ventilation disk; a spray gun for atomizing binder provided on the ventilation disk; and a coating liquid provided on the ventilation disk. A granulation and coating device comprising at least one of an atomizing spray gun and a coating powder supply port. 2. The granulation and coating device according to claim 1, which has a granulation action-enhancing blade rotatably installed on the upper part of the ventilation disc and integrally therewith.