JPH0624620B2 - Powder processing equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a powder or granular material processing apparatus, and more particularly to a powder or granular material processing apparatus capable of performing granulation, coating, mixing, drying, etc. of powder particles with high productivity. .

[Background technology]

In general, various types of mechanical devices have been conventionally used for granulation, coating, mixing, drying, etc. of powders and granules used for medicines, foods, ferrites, toners and the like.

As one of such conventional devices, a structure in which a wire mesh is provided on the entire lower surface in the granulating cylinder and a rotating disk is provided on the upper part of the wire mesh is disclosed in JP-A-54-62978 and JP-A-56-13.
It is disclosed in Japanese Patent No. 3024. However, although this conventional apparatus is capable of granulation coating, the problem that granules enter between the rotating disc and the wire mesh and are rubbed and crushed on the entire surface of the wire mesh by the rotation of the rotating disk There was a point. Further, this conventional device has a problem that the productivity is low.

Also, Japanese Patent Publication No. 46-22544 and Japanese Patent Publication No. 47-4.
In Japanese Patent Publication 7794, the container bottom is formed of a rotating disk, and the centrifugal rotation operation is performed by the rotation of the rotating disk and the action of slit air blown from the gap between the rotating disk and the container wall. A structure for coaching is disclosed. However, this conventional device is basically intended for coating, and has a serious drawback that it is not suitable for mass production even if it is applied for granulation operation, and its productivity is low.
Further, this conventional apparatus can form heavy and spherical granules, but has a problem that it is not suitable for light ones.

In order to solve these problems, the applicant of the present invention has provided the granulation coating apparatus disclosed in Japanese Patent Laid-Open No. 59-55337 and has achieved the desired effect.

By the way, in this apparatus, slit air is supplied from an air supply fan outside the apparatus to a slit chamber located under the slit through a flow rate adjusting valve, and is ejected from there into the granulating cylinder through the slit. However, it is not always easy to eject the slit air uniformly from each part of the annular slit because a rotating plate needs to rotate and a precise structure is required, and it is not easy from the slit near the inlet path to the slit chamber. Many, a little gushes out from the slit far from it. Therefore, the present inventor has found that in a portion where only a small amount of air is ejected, the powder or granules in the granulation cylinder may drop from the slit, resulting in waste of raw materials or contamination of the inside of the apparatus.

[Object of the Invention]

An object of the present invention is to provide a powdery or granular material processing device capable of preventing powdery or granular materials from falling through a slit formed between a rotating plate and a granulating cylinder side, and eliminating waste of raw materials and contamination inside the device. To provide.

Another object of the present invention is to provide a powdery or granular material treating apparatus capable of controlling the bulk density, hardness, particle size and the like of a product as desired and obtaining a product having a high sphericity with high productivity.

[Outline of Invention]

The granulation coating apparatus according to the present invention is a body portion into which the granules to be subjected to granulation and coating are charged, and a rotating plate having a ventilation portion that rotates substantially horizontally at the bottom portion of the body portion and that can be aerated, An annular slit formed between the outer peripheral surface of the rotating plate and the inner peripheral surface of the body portion, and a slit gas provided on the lower side of the rotating plate and supplying slit gas into the body portion through the slit. An annular partition that divides into a slit gas passage and a gas passage that supplies gas into the body through the ventilation portion, and an annular partition below the slit so as to cover the entire lower surface of the slit in the slit gas passage. And a flow plate having a breathable powder particle fall prevention rectifying member that makes the flow of the slit gas through the slits uniform and prevents the powder particles from falling, and is formed on the rotary plate and the rotary plate. While flowing granular material by gas ejected from the gas and slit ejected from the vent performs a granulation coating process.

[Embodiment 1] FIG. 1 is an overall schematic cross-sectional view showing one embodiment of a powdery or granular material processing apparatus according to the present invention.

The powdery- or granular-material processing apparatus in this Example has a substantially cylindrical granulating tube 1 which is installed in a substantially upright state and which granulates and coats the powdery and granular materials charged therein. Granulation cylinder 1
A discharge chute 2 for taking out a product which has been granulated and coated and a discharge valve 3 for opening and closing the discharge port are provided on the bottom side surface of the.

Granulation cylinder 1 at approximately the same level as the discharge chute 2
At the bottom of the inside, there is provided a rotating disk 4 for rotating in the granulating cylinder 1 in a substantially horizontal direction for granulating coating.

The rotary disc 4 is rotated by rotating a rotary shaft 5 provided in a substantially vertical shape substantially at the center of the body of the granulating cylinder 1 from a variable speed motor 6 via a belt 7 in a desired direction. .

Further, the rotary disc 4 has a ventilation part 8 made of a perforated plate by punching. The ventilation part 8 can be made of a braided material such as a sintered plate or a wire mesh having pores to the extent that powder particles do not leak in addition to the perforated plate.

The gap between the peripheral edge of the rotating disk 4 and the inner wall surface of the body of the granulating cylinder 1 is formed as an annular slit 9. By separately controlling the slit gas supplied through the annular slit 9 into the granulation cylinder 1 and the gas supplied through the ventilation part 8 of the rotary disc 4 into the granulation cylinder 1, respectively. A desired product can be manufactured by giving a flow pattern different from the flow pattern of only the slit gas or the gas passing through the ventilation portion 8 to the granular material.

Therefore, on the lower side of the rotating disk 4, the rotating disk 4 is attached to the upper end.
An annular partition wall 11 provided with a labyrinth-type seal ring 10 that fits into an annular groove formed on the lower surface of the bottom wall 12 tatami mat is installed in the granulation tube 1 through the slit 9 by the annular partition wall 11. The gas passages 13 and 14 for the jetted slit gas and the gas jetted into the granulation cylinder 1 through the ventilation portion 8 are separately formed as separate systems, and the gas flow rates can be controlled independently of each other. Is configured.

Further, in the slit gas passage 13, an annular slit 9 is provided.
Located below the slit 9 so as to cover the entire lower surface of
A rectifying plate 15 made of a wire net, a perforated plate, a woven cloth, or the like is provided. The flow regulating plate 15 has air permeability, makes the flow of gas through the slit 9 uniform, and prevents the powder or granular material from dropping from the slit 9. The purpose thereof is to control the flow of the slit gas through the slit 9 to prevent the powder or granules from falling from the slit 9, as will be described below.

That is, the gas supplied from the ventilation part 8 and the slit 9 into the granulation cylinder 1 is first commonly blown out from the air supply fan 16, is cleaned through the filter 18 in the air supply duct 17, and is then heated. After being heated to a desired heating or cooling temperature by the exchanger 19, it is supplied to the bottom of the air supply duct 17, and the air supply passage from the bottom of the air supply duct 17 to the bottom of the granulation cylinder 1 is the gas The annular partition wall 1 for partitioning the passages 13 and 14
The partition wall 20 connected to 1 divides into a slit gas passage 21 and a gas passage 22 to the ventilation portion 8. The slit gas passage 21 and the gas passage 22 are in communication with the slit gas passage 13 and the gas passage 14, respectively. Further, a slit gas flow rate adjusting valve 23 and a gas flow rate adjusting valve 24 are arranged near the inlets of the respective gas passages 21 and 22. These flow rate adjusting valves 23, 2
By controlling 4 independently, various flow patterns can be obtained by the two gas flows ejected into the granulation cylinder 1 through the slit 9 or the ventilation part 8.

By the way, in that case, the width of the slit 6 is preferably uniform because the rotating disk 4 is required to rotate, but the width of the slit 9 may be different due to manufacturing tolerances or deviation of the angle of the rotary shaft 5. May be partially reduced, and even if the width is constant, the flow rate of the slit gas ejected from the slit 9 may be partially different depending on the position of the slit gas passage 13. sell. Therefore, in this embodiment, the flow rate of the slit gas ejected from the slit 9 can be made uniform as a whole by providing the straightening plate 15 that provides a resistance to the flow of the slit gas just below the slit 9. It is intended to prevent the granular material from dropping from the slit 9 during the granular operation. The rectifying plate 15 of the first embodiment has an area that is considerably smaller than the area of the rotating disc 4, and the phenomenon that powder particles are rubbed between the rectifying plate 15 and the rotating disc 4 does not occur. This was well accepted in the experiments by the present inventors.

Further, when the raw material was charged, in the conventional apparatus, it was necessary to lower the rotating disk to make the slit 9 have a gap of zero to prevent the raw material from falling. In the first embodiment, the straightening plate 15 directly drops the charged raw material. In order to prevent this, an elevating device for the rotating disc 4 becomes unnecessary.

Further, in the first embodiment, a resistance member having a crescent shape, for example, is provided in a portion of the slit 9 where the flow rate of the slit gas is particularly large, for example, a portion above the ejection port of the slit gas passage 13 in FIG. 15a can be provided separately. The resistance member 15a is provided in the slit gas passage 1
The slit gas ejected from No. 3 is once applied to the resistance member 15
Since the flow velocity can be weakened by hitting a, it is possible to prevent the slit gas flow rate of only the portion corresponding to the ejection port of the slit gas passage 13 from becoming larger than the other portions, and to make the slit gas flow rate more uniform. . However, the resistance member 15a does not necessarily have to be provided.

Further, instead of providing the resistance member 15a, if the opening area is made smaller in the portion above the ejection port of the slit gas passage 13 of the wire mesh of the rectifying plate 15 and the opening area is made larger in the other portions, the gas of the slit 9 will be The part where the flow rate is large has a large resistance, and the part where the gas flow rate is small has a small resistance.
The slit gas flow rate can be made more uniform.

[Embodiment 2] FIG. 2 is an enlarged partial sectional view showing another embodiment of the present invention.

In the second embodiment, a perforated plate is used as the straightening plate 15, and the flow rate of the slit gas can be made uniform by the straightening action.

Of course, also in the second embodiment, by providing a resistance member in a portion where the flow rate of the slit gas is large, or by increasing the number or size of the pores in that portion and decreasing the other portions, a more uniform structure can be obtained. The slit gas flow rate can be obtained.

[Embodiment 3] FIG. 3 is an enlarged partial sectional view showing still another embodiment of the present invention.

In the third embodiment, the ventilation part 8 is made of wire mesh and the rectifying plate 15 is made of woven cloth.

Also in the case of the present embodiment, the function of the current plate 15 causes the slit 9
It is possible to make the gas flow rate through the whole uniform, and to prevent the granular material from dropping from the slit 9 and causing waste or contamination of the raw material.

The present invention is not limited to the above embodiment,
Various other modifications are possible.

For example, the structures of the rectifying member and the resistance member and the like may be arbitrarily set to those other than those in the above embodiments.

〔effect〕

The slit gas passage has a granular material fall prevention rectifying member annularly arranged below the slit so as to cover the entire surface below the slit, and the granular material fall prevention rectifying member of the slit gas passing through the slit. By simultaneously performing the two functions of making the flow uniform and preventing the powder particles from falling, it is possible to prevent the raw materials and products from dropping from the slits and causing waste and contamination inside the apparatus.

(2). According to the above (1), the bulk density, hardness, particle size, etc. of the product can be controlled as desired, and a product with high sphericity can be obtained with good productivity.

(3). By configuring the rectifying member such that the portion having a large slit gas flow rate has a large resistance and the portion having a small flow rate has a small resistance, the gas flow rate of the slit can be made more uniform.

(Four). By providing the resistance member only in the portion where the gas flow rate of the slit is large, the gas flow rate of the slit can be made more uniform.

[Brief description of drawings]

FIG. 1 is a schematic overall cross-sectional view showing an embodiment of the powder / particle processing layer apparatus according to the present invention, FIG. 2 is an enlarged partial cross-sectional view of another embodiment of the present invention, and FIG. It is an expanded partial sectional view of other examples. 1 ... Granulation cylinder, 2 ... Discharge chute, 3 ... Discharge valve, 4 ... Rotating disk, 5 ... Rotating shaft, 6 ... Motor, 7 ... Belt, 8 ... Ventilation section, 9 ... ... slit, 10 ... seal ring, 11 ... annular partition, 12 ... bottom wall, 13 ... slit gas passage, 14 ... gas passage, 15 ... straightening plate, 15a ... resistance member, 16 ... supply Air fan, 17 ... Air supply duct, 18 ... Filter, 19 ... Heat exchanger, 20 ... Partition wall, 21 ... Slit gas passage, 22 ... Gas passage, 23 ... Slit gas flow control valve, 24 ...... Gas flow control valve, 25 …… Spray, 26 …… Bag filter, 27 …… Pulse jet.

Claims (7)

[Claims] 1. A body part into which granules to be granulated and coated are put, a rotary plate which has a ventilation part which is substantially horizontally rotated at the bottom part of the body part and which can be aerated, and a rotary plate of the rotary plate. An annular slit formed between an outer peripheral surface and an inner peripheral surface of the body portion, and a slit gas passage provided below the rotating plate and supplying slit gas into the body portion through the slit. An annular partition that divides into a gas passage that supplies gas into the body portion through the ventilation portion, and an annular partition that is disposed below the slit so as to cover the entire lower surface of the slit in the slit gas passage,
A powdery or granular material processing device, comprising: an air-permeable powdery or granular material drop prevention rectifying member that makes the flow of slit gas through the slits uniform and prevents the powdery or granular material from falling. 2. The powdery or granular material processing apparatus according to claim 1, wherein the powdery or granular material fall prevention rectifying member is a wire mesh. 3. The powdery or granular material processing device according to claim 1, wherein the powdery or granular material fall prevention rectifying member is a perforated plate. 4. The powdery or granular material processing device according to claim 1, wherein the powdery or granular material fall prevention rectifying member is a woven cloth. 5. The powder / particle fall prevention rectifying member is configured such that a portion of the slit where gas easily flows has a large resistance, and a portion of the slit where gas hardly flows has a small resistance. The powder or granular material processing device according to claim 1. 6. The powdery or granular material processing apparatus according to claim 1, wherein a resistance member is provided only in a portion of the slit where gas easily flows. 7. The powdery or granular material processing apparatus according to claim 1, wherein the gas passing through the ventilation part of the rotary plate and the gas passing through the slit are controlled independently of each other.