JP3314953B2 - Granulation coating equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a granulation coating apparatus, and more particularly to a granulation coating apparatus for coating tablets and the like in a horizontal rotating drum.

[0002]

2. Description of the Related Art FIGS. 9 and 10 show an example of a granulating coating apparatus (A) having a horizontal rotating drum.

In FIG. 1, (1) is a casing surrounding the entire apparatus, and (2) is a rotating drum rotatably supported in the casing (1) so that a rotating shaft is horizontal. is there.

The rotary drum (2) has a polygonal shape at the center,
For example, it has a nine-sided shape, both sides are conically narrowed, one is an entrance for product supply and discharge, and the other is a hollow shaft (3) communicating with the inside of the rotating drum (2). The hollow drum (3) is rotatably supported by a bearing (4), so that the rotary drum (2) rotates about the axis of the hollow shaft (3).

[0005] Each surface constituting the nine sides of the rotary drum (2) comprises a perforated plate (5) and a chamber (6) serving as an air passage disposed outside the perforated plate (5). When each chamber (6) comes down with the rotation of the rotary drum (2), the opening provided on the side of the chamber (6) is connected to the exhaust passage (7) provided in the casing (1). It is made to communicate with.

[0006] (8) penetrates the hollow shaft (3), the rotating drum
This is the inner duct inserted in (2).

The inner duct (8) has a hollow cylindrical shape, and its front end is closed, and its rear end communicates with an air supply passage (9) provided in the casing (1). The dry air supplied from the air supply passage (9) into the inner duct (8) is further supplied to the portion located inside the rotary drum (2) on the outer periphery of the inner duct (8). Nozzle holes are provided for jetting into the nozzle.

Further, a spray gun (10) for spraying a coating liquid into the rotary drum (2) is incorporated in the inner duct (8) or at the outer peripheral portion of the inner duct (8).

In the above configuration, for example, when coating the surface of the tablet (C), the tablet (C) is put into the rotating drum (2), the rotating drum (2) is rotated, and Rotary drum from air passage (9) through inner duct (8)
Dry air is supplied to the inside of the rotary drum (2), and the dry air supplied to the rotary drum (2) is supplied to the chamber (6) from the perforated plate (5) which is presently located below the rotary drum (2). It is guided and exhausted to the outside through an exhaust passage (7) communicating with the chamber (6).

When the tablet (C) is stirred in the rotating drum (2) by the rotation of the rotating drum (2) and a flow of dry air is formed in the rotating drum (2), the spray gun From (10), the coating liquid is sprayed toward the tablets (C) in the rotating drum (2).

Then, the coating liquid is sprayed around the tablet (C), so that a coating layer is formed on the surface of the tablet (C), and the coating layer is dried by the dry air flowing in the rotating drum (2). Then, the coating operation is completed.

[0012]

As described above, at the time of coating the surface of the tablet (C) placed in the rotating drum (2),
If dry air is supplied into the rotary drum (2) from the inner duct (8) arranged in the center of the rotary drum (2), the dry air flows efficiently around the tablet (C) sprayed with the coating agent be able to.

However, when the inner duct (8) is arranged at the center of the rotating drum (2), when the tablet (C) is stirred by the rotation of the rotating drum (2), the tablet (C) is moved to the inner duct (8). Adheres to the outer periphery of the rotating drum (2).
There was a problem that it was mixed with the tablet (C) inside, resulting in a final defective product.

When the inner duct (8) is disposed at the center of the rotary drum (2), the inner duct (8)
(8) When the coating liquid is sprayed from the spray gun (10) disposed inside or outside the inner duct (8), the spray mist adheres to the inner duct (8) and peels off later.

In the sugar coating process, the lifted tablets attached to the rotating drum (2) fall and fall into the inner duct (8).
There was also a problem that a scratch or a chip was generated.

It is also conceivable to abolish the inner duct (8) and dispose only the spray gun (10) at the center of the rotary drum (2).
The dry air from (9) goes straight through the center of the rotating drum (2), and this air flow disturbs the spray mist from the spray gun (10), and the coating liquid is applied stably to the tablet (C). The problem that it cannot be performed arises.

[0017]

SUMMARY OF THE INVENTION A granulating coating apparatus is rotatably supported so that a rotating shaft is horizontal, and a rotating drum for accommodating an object to be processed therein, and a coating liquid is supplied into the rotating drum. Spraying means, an opening formed in the center of one side surface of the rotating drum, communicating with an air supply passage for supplying air into the rotating drum, and a rectifying plate fitted inside the rotating drum inside the opening. Make up,

The current plate is formed by a hemispherical or frustoconical perforated plate protruding inward of the rotary drum, and only the central portion thereof is made to be flat.

[0019]

As described above, by disposing a hemispherical or truncated conical rectifying plate in the opening communicating with the air supply passage, air is uniformly supplied into the rotating drum, and the inner drum is supplied from the rotating drum. It eliminates ducts.

[0020]

1 and 2 show a granulation coating apparatus (B) according to the present invention.

In the figure, (21) is a casing surrounding the entire apparatus, and (22) is a rotating drum rotatably supported in the casing (21) so that the rotating shaft is horizontal. is there.

The rotating drum (22) has a nine-sided shape at the center, is conical on both sides, one is an entrance for product supply and discharge, and the other is a rotary drum
A hollow shaft (23) communicating with the inside protrudes, and the hollow shaft (23) is rotatably supported by a bearing (24), so that the rotating drum (22) is rotated by the shaft of the hollow shaft (23). It is designed to rotate around the center of rotation.

Each surface constituting the nine sides of the rotary drum (22) is composed of a perforated plate (25) and a chamber (26) serving as an air passage disposed outside the perforated plate (25). When each of the chambers (26) comes down with the rotation of the rotary drum (22), the opening provided on the side of the chamber (26) opens the exhaust passage (27) provided in the casing (21). It is made to communicate with.

(28) is a spray gun disposed at the center of the rotating drum (22) for spraying the coating liquid toward the tablets (C) in the rotating drum (22).

Reference numeral (29) denotes a flow straightening plate mounted on the opening (31) of the hollow shaft (23) communicating with the air supply passage (30) into the rotary drum (22).

As shown in FIG. 3, the current plate (29) is formed of a hemispherical perforated plate, and has a central portion (29).
Only a) is a mask, and a predetermined number of through-holes (29b) having a predetermined hole ratio are provided other than at the center.

Around the current plate (29), a flange (29c) for attachment to the opening (31) is provided, and this flange (29c) is bolted to the outer periphery of the opening (31). The current plate (29) is fixed to the rotating drum (22) by fixing by such means.

The current plate (29) is, as shown in FIG.
Instead of being formed in a hemispherical shape, it may be formed in a truncated cone shape as shown in FIG.

In the above configuration, for example, when coating the surface of the tablet (C), the tablet (C) is put into the rotating drum (22), and the rotating drum (22) is rotated.
Dry air is supplied from the air supply passage (30) to the rotary drum (22) through the flow straightening plate (29), and the dry air supplied to the rotary drum (22) is supplied to the lower side of the current rotary drum (22). The perforated plate (25) is guided to the chamber (26) and exhausted to the outside through an exhaust passage (27) communicating with the chamber (26).

When the tablet (C) is stirred in the rotating drum (22) by the rotation of the rotating drum (22) and a flow of dry air is formed in the rotating drum (22), the spray gun From (28), the coating liquid is sprayed toward the tablets (C) in the rotating drum (22).

At this time, the rectifying plate (2) communicated with the air supply passage (30).
In the case of 9), the center part (29a) becomes a mesh, and a through hole
(29b), the air does not blow directly to the spray gun (28) arranged in the center of the rotating drum (22), and the dry air ejected from the through hole (29b) The spray mist from the spray gun (28) is not disturbed by the drying air because it is sprayed uniformly around the entire circumference of the rotating drum (22), and the drying air is evenly distributed in the rotating drum (22). Go around.

Accordingly, since the coating liquid is sprayed around the tablet (C), a coating layer is formed on the surface of the tablet (C), and the coating layer is dried by the dry air flowing in the rotating drum (22). Then, the coating operation is completed.

In the above embodiment, the opening ratio of the through hole (29b) provided in the current plate (29) is changed between the central portion and the outer peripheral side so that the opening ratio on the outer peripheral side is increased. This allows the dry air to flow more reliably to the outer peripheral side of the rotating drum (22).

FIG. 5 shows a second embodiment of the current plate (29) according to the present invention. The current plate (29) shown in this embodiment is shown in FIG.
The rectifier (40) having the shape of a truncated cone is disposed on the inner peripheral side of the central portion (29a) that has become a mat.

The flow of the dry air ejected from the current plate (29) is changed by changing the inclination angle of the inclined surface (41) of the current body (40).

That is, when the inclination angle is reduced, the dry air is blown toward the whole of the rotary drum (22) except for the central portion, and when the inclination angle is increased, the dry air is released from the rotary drum (22).
Will be blown out only toward the outer periphery.

In this embodiment, the current plate (29) is also
Instead of being formed in a hemispherical shape, it may be formed in a truncated conical shape as shown in FIG.

FIG. 7 shows a third embodiment of the current plate (29) according to the present invention. The current plate (29) shown in this embodiment is shown in FIG.
Is a shaft on the inner peripheral side of the central part (29a)
A disk-shaped rectifier (46) is arranged via (45).

By changing the size (radius) of the disc-shaped rectifier (46), the flow of dry air ejected from the rectifier plate (29) is changed.

That is, when the radius of the rectifier (46) is reduced,
The dry air is blown out to the whole of the rotary drum (22) except for the central portion, and when the radius is increased, the dry air blows out only to the outer circumferential portion of the rotary drum (22).

In this embodiment, the current plate (29) is also
Instead of being formed in a hemispherical shape, it may be formed in a truncated conical shape as shown in FIG.

[0042]

As described above, according to the present invention, a rectifying plate is disposed at an opening provided at the center of one side of the rotating drum and communicated with the air supply passage. It is formed by a hemispherical or frusto-conical perforated plate protruding to the side, and only the central part is made to be flat, so that air is evenly distributed in the rotating drum without directly blowing air to the spray gun in the rotating drum In addition to the supply, the inner duct can be eliminated from the rotating drum.

Accordingly, unlike the conventional granulation coating apparatus, it is possible to reliably prevent the object to be processed from adhering to the outer periphery of the inner duct disposed in the rotary drum.
The diffusion of the spray mist from the spray gun can be reliably prevented from being alienated by the inner duct, and a good coating operation can be performed.

Further, since the current plate according to the present invention has a structure in which the current plate is merely fitted to the opening of the hollow shaft on the drum side, when the current plate is cleaned, only the cleaning nozzle is inserted into the hollow shaft. Cleaning can be performed, and the cleaning performance is much better than that of a conventional long inner duct.

[Brief description of the drawings]

FIG. 1 is a schematic view of a main part of a granulation coating apparatus according to the present invention as viewed from a side.

FIG. 2 is a schematic view of a main part of the granulation coating apparatus according to the present invention as viewed from the front.

FIG. 3 is a side sectional view showing the first embodiment of the current plate.

FIG. 4 is a side sectional view showing a modification of the first embodiment of the current plate.

FIG. 5 is a side sectional view showing a second embodiment of the current plate.

FIG. 6 is a side sectional view showing a modification of the second embodiment of the current plate.

FIG. 7 is a side sectional view showing a third embodiment of the current plate.

FIG. 8 is a side sectional view showing a modification of the third embodiment of the current plate.

FIG. 9 is a schematic view of a main part of a conventional granulation coating apparatus viewed from the side.

FIG. 10 is a schematic view of a main part of a conventional granulation coating apparatus viewed from the front.

[Explanation of symbols]

 B Granulation coating apparatus C Tablet 22 Rotary drum 23 Hollow shaft 28 Spray gun 29 Rectifier plate 29a Central part of rectifier plate 29b Through hole 30 Air supply passage 31 Opening 40 Rectifier 41 Inclined surface 45 Shaft 46 Rectifier

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-2-207833 (JP, A) JP-A-3-254829 (JP, A) JP-A-2-1177032 (JP, U) (58) Field (Int.Cl. ⁷ , DB name) B01J 2/00 B01J 2/12 B01J 8/00 B01J 8/10 311

Claims (3)

(57) [Claims] 1. A rotating drum rotatably supported so that a rotating shaft is horizontal and accommodating an object to be processed therein, spray means for supplying a coating liquid into the rotating drum, and one side surface of the rotating drum An opening formed in a central portion and communicating with an air supply passage for supplying air into the rotating drum; and a rectifying plate fitted inside the rotating drum in the opening. A granulation coating apparatus characterized by being formed by a hemispherical or truncated conical perforated plate protruding inward and having only a central portion of the perforated plate. 2. A rotating drum which is rotatably supported so that a rotating shaft is horizontal and stores an object to be processed therein, a spray means for supplying a coating liquid into the rotating drum, and one side surface of the rotating drum An opening formed in a central portion and communicating with an air supply passage for supplying air into the rotating drum; and a rectifying plate fitted inside the rotating drum in the opening. A cone formed by a hemispherical or truncated cone-shaped perforated plate protruding inward, with only the center part being a mesh, and a side surface with an inclined surface on the inner peripheral side of the center part that became the mesh A granulation coating apparatus comprising a trapezoidal straightening body. 3. A rotating drum rotatably supported so that a rotating shaft is horizontal and accommodating an object to be processed therein, spray means for supplying a coating liquid into the rotating drum, and one side surface of the rotating drum. An opening formed in a central portion and communicating with an air supply passage for supplying air into the rotating drum; and a rectifying plate fitted inside the rotating drum in the opening. It was formed by a hemispherical or truncated conical perforated plate protruding inward, and only the central part was a metal, and on the inner peripheral side of the central part that became the metal, a disk was formed via a shaft. A granulation coating apparatus characterized by disposing a rectifier.