JP2000246084A - Granulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To continuously operate a granulator without causing a halt due to over load and carry out granulation within a short time. SOLUTION: This granulator carries out granulation of an object material to be treated W by sending the object W extruded and in roughly granulated state to a cylindrical treatment tank 3 and granulating the object W by stirring blades 12 rotated in the treatment tank 3. In this case, a granulation plate 9 extended like a flange from the inner wall of the treatment tank 3 is installed immediate under the rotation tracks of the tip end parts of the stirring blades 12 and further a disk-like dispersion plate 11 rotated together with the stirring blades 12 is installed above the stirring blades 12. Consequently, without causing over load cease attributed to stagnation, adhesion, or the like of a fine particle and an ultrafine powder by sieving function, continuous granulation work is made possible and at the same time, since the granulation is carried out by the stirring blades 12 and the granulation plate 9, the treatment time can be shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for obtaining granules having a desired aspect ratio, and particularly to a method for continuously granulating articles discharged from a granulator and continuously treating the granulated articles. The present invention relates to a sizing machine capable of being discharged to a granulator.

[0002]

BACKGROUND OF THE INVENTION In order to obtain granules of foods, pharmaceuticals, agricultural chemicals, feeds, chemicals, etc., a desired aspect is obtained by sizing a wet raw material using an extrusion granulator or the like to form a granulated product. The granulation machine used is roughly classified into two types: a dry granulation type in which the granulated product is dried and then granulated, and a granulated product in which the granulated product is in a wet state. And a wet sizing type. Among them, the wet type sieving type does not require a drier, a sieve and the like, which are essential when the dry type sizing type is used, so that the production cost is low and the device is advantageous in terms of yield.

[0003] An example of the above-mentioned wet-type sizing machine is disclosed in Japanese Patent Publication No. 41-563, "Method and Apparatus for Spherical Sphering of Granules". This is a type of device in which a disk-shaped rotating body is rotated in a cylindrical sizing chamber. The material put on the rotating body is pressed against the inner wall of the sizing chamber by centrifugal force, and is sized by a rolling operation. It is to be grained. However, the processing mode is a batch type in which the charging, sizing, stopping and removing of the rotating body are sequentially performed in order of the structure, and the operation of the granulating machine arranged in front of the sizing machine is performed by the sizing machine. Since it is necessary to synchronize with driving,
When the granulator is stopped, there is a possibility that the granulated portion (screen) may be clogged due to drying of the wet material.

[0004] Therefore, an invention of a sizing machine capable of making the processing form continuous has been made, and is disclosed in Japanese Patent Publication No. 8-27133.
No. "A wet powder processing apparatus". As shown in FIG. 6, the material to be treated W is placed on a sizing plate 9 ′ arranged in a cylindrical container 3 ′ as shown in FIG.
Is rotated to cause rolling and crushing action on the material to be treated W, and the surface water of the material to be treated W is discharged by a fluid (gas) ejected from ejection means provided above the sizing plate 9 '. The action of removing and dispersing / disintegrating is caused, and thereby the material to be treated W is sized.

The processing form is such that the spouted fluid overcomes the centrifugal force applied to the material to be treated W by the rotation of the particle sizing plate 9 ', and the material to be treated W is provided at the center of the plate 9'. A continuous operation is performed by a so-called overflow method of dropping from a given opening and discharging continuously from here, but has the following problems.

First, the "processing apparatus for wet powdery granules" has a structure in which the material W to be processed stays on the sizing plate 9 'for a long time. Because of the classifying action, fine particles and fine powder are excessively retained near the sizing plate 9 ', or the material W to be processed is leaked from a gap between the sizing plate 9' and the container 3 '. And there is a problem that the overload is stopped due to adhesion. In addition, since a blowing means such as a blower is essential, there is a limit to downsizing and cost reduction of the entire apparatus including this.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of such a background, and enables continuous operation without causing an overload stop, and further performs sizing in a short time. The technical task was to develop a new particle sizer that could do this.

[0008]

According to a first aspect of the present invention, there is provided a granule sizing machine in which a material to be extruded is fed into a cylindrical processing tank, and the material to be processed is rotated in the processing tank. In a device for sizing the granules by a blade, a sizing plate is provided immediately below the rotation trajectory of the tip of the stirring blade so as to protrude in an inner flange shape from the inner wall of the processing tank. A disk-shaped dispersion plate that rotates with the wings is provided. ADVANTAGE OF THE INVENTION According to this invention, a continuous sizing operation | movement is attained, without causing overload stop resulting from stagnation, adhesion, etc. of a fine particle and a fine powder by a classification effect. In addition, since the sizing is performed by the stirring blade and the sizing plate, the processing can be performed in a short time.

According to a second aspect of the present invention, in addition to the above requirements, the agitating blade is formed so that a tip portion thereof is bent upward along the inner wall of the processing tank. It is a feature. According to the present invention, a pressing action in the direction of the inner wall surface of the processing tank is obtained, so that the sizing efficiency is improved and the sizing time can be shortened.

[0010] Furthermore, in addition to the above requirements, the grain sizing apparatus according to claim 3 is characterized in that the grain sizing plate, the stirring blade, and the dispersion plate are provided in multiple stages in the vertical direction.
According to the present invention, the material to be treated, which is not placed on the upper sizing plate and falls between the dispersion plate and the sizing plate and is not subjected to the sizing treatment, is provided in the lower sizing plate and Since the treatment can be performed by the stirring blade, the mixture of the material to be treated into the product can be prevented.

Further, in addition to the above requirements, the grain sizing machine according to claim 4 further comprises a stirring blade or a disc near the bottom of the treatment tank for continuously discharging the sieved material to be treated. It is characterized by having. According to the present invention, the intermediate product subjected to the sizing treatment can be continuously discharged, and the size of the apparatus can be reduced because no equipment such as a blower is required. The above object is achieved by using the configuration of the invention described in each of the claims.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A basic embodiment of a granulator according to the present invention will be described below with reference to the drawings. Sizing machine 1
As shown in FIG. 1, in a casing 2 formed by combining a metal plate and the like in a box shape, a material W to be treated, which is a granulated product obtained by using an extruder and the like in a wet state, is prepared. Processing tank 3 where granulation is performed
And a sizing member 5 for substantially sizing the inside of the processing tank 3.

The processing tank 3 is a cylindrical container having a bottom as shown in FIG. 2, and is provided with a lid 6 at an upper portion thereof. The discharge port 8 is formed in the side peripheral portion of. In the vicinity of the center of the processing tank 3 in the height direction, a sizing plate 9 is provided, which is, as shown in FIG. 4, 10 mm shorter than the inner diameter (radius) of the processing tank 3 as an example. It is an annular member having an inner diameter.

As an example of a structure for providing the above-mentioned sizing plate 9 near the center of the processing tank 3 in the height direction, as shown in an enlarged view in FIG. Assume that one end of each cylindrical member is bent outward in a flange shape, and the granule sizing plate 9 is fixed by these flange portions. Therefore, in the vicinity of the center of the processing tank 3 in the height direction, the sizing plate 9 is positioned inside the processing tank 3 in a state of protruding like an inner flange.
Of course, besides this, the outer diameter of the sizing plate 9 is made the same as the inner diameter of the processing tank 3 and the sizing plate 9 charged in the processing tank 3 is welded to the inner wall of the processing tank 3. You can also.

Next, the grain sizing member 5 will be described. The grain sizing member 5 is provided with a dispersion plate 11 above a shaft 10 arranged in the center of the processing tank 3 and a stirring blade near the center in the longitudinal direction. 12 and a discharge stirring blade 13 near the lower end.

The dispersion plate 11 is, for example, a disk having a radius shorter by 20 mm than the inner diameter (radius) of the processing tank 3.

Further, as defined in the first aspect, the agitation plate 9 which projects from the inner wall of the processing tank 3 into an inner flange shape is located immediately below the rotation locus of the tip of the agitation blade 12. So as to be freely rotatable in such a manner as to form two blades, four blades or the like. Further, as defined in claim 2, the agitating blade 12 is formed by processing the tip portion so as to be bent upward along the inner wall of the processing tank 3. Specifically, as shown in an enlarged view in FIG. 2 as an example, a bent portion 12a is formed at an end of the stirring blade 12, and a side surface of the bent portion 12a and an inner wall of the processing tank 3 are formed. The interval was 5 mm, and the height of the bent portion 12a (the height from the upper surface of the stirring blade 12) was 20 mm.

Further, near the bottom of the processing tank 3 on the shaft 10, there is provided a discharge stirring blade 13 for continuously discharging the processed material W having been subjected to the sizing treatment. In the present embodiment, two blades are used as an example as shown in FIG. 1, but four blades or the like may be used.

The shaft 10 has an end protruding from the bottom of the processing tank 3 by using a bearing or the like as appropriate. The shaft 10 is rotationally driven by a motor M by interposing an appropriate speed reducer (as an example, at 600 rpm). .M).

The sizing machine 1 of the present invention has a structure as described above as an example, and the operation state of this apparatus will be described below. Since the granulator 1 is a device for granulating the material to be treated W granulated by the granulator 20, the hopper 2 provided to face the discharge part of the granulator 20 as shown in FIG.
The outlet 1 is set so as to face the inlet 7 of the granulator 1.

(1) Granulation First, as an example, a wet raw material (having a water content of 20% DB) obtained by adding a binder (water) to a mixed powder of talc and bentonite is granulated by a granulator 20. To be treated W
In this embodiment, a granulator having a granulation hole diameter of φ = 0.5 mm is used as the granulator 20.

(2) Injection and sizing of the material to be treated The material to be treated W obtained by the granulator 20 is put into the inlet 7 of the granulator 1 through the hopper 21 and is in a rotating state. It is supplied onto the dispersion plate 11. The material to be processed W moves toward the outer peripheral portion on the dispersion plate 11 under the centrifugal force, and eventually collides with the inner wall of the processing tank 3.
It is located on the sizing plate 9 located below the dispersion plate 11. Next, the material to be treated W is subjected to a crushing action by the stirring blade 12 rotating close to the upper surface of the sizing plate 9, and becomes a granular intermediate product P having a small aspect ratio in a short time.

Here, the data showing the sizing action of the sizing machine 1 is described. Table 1 shows the distribution of the aspect ratio measured after the material to be treated W before drying is dried.
Shows the distribution of the aspect ratio measured after drying the intermediate product P after sizing.

[0024]

[Table 1]

[0025]

[Table 2]

As described above, the average aspect ratio before sizing is about 3.5, whereas the average aspect ratio after sizing is about 2, and the variation of the aspect ratio is 1 standard deviation. It was confirmed that the value was reduced from 0.75 to 1.07.

(3) Discharge The intermediate product P sized as described above falls from the sizing plate 9 and eventually reaches the bottom of the processing tank 3. Discharge agitator 1
3, it is sent to the inner wall portion of the processing tank 3 and is sent out from the discharge port 8 to the outside. The intermediate product P having a desired aspect ratio obtained in this manner is appropriately dried to obtain a product.

[0028]

Other Embodiments Although the present invention is based on the above-described embodiment, the following embodiments can be adopted based on the technical idea of the present invention.
First, in the above embodiment, the stirring blade 12 is of a bent type, but the point is that, as defined in claim 1, immediately below the rotation trajectory of the tip of the stirring blade 12, an inner flange is formed from the inner wall of the processing tank 3. It is only necessary that the sizing plate 9 is rotatably disposed so as to position the sizing plate 9 projecting in a shape, and thus the sizing plate 9 does not have the bent portion 12a.

Further, as defined in claim 3 and as shown in FIG. 5, the sizing plate 9, the stirring blade 12 and the dispersion plate 11 may be provided in multiple stages in the vertical direction. In this case, even if the supply of the material to be processed W from the upper-side dispersion plate 11 to the sizing plate 9 is not successful, and the sizing material falls into the inside of the sizing plate 9 without sizing. Since the sizing process can be performed by the sizing plate 9 and the stirring blades 12 on the lower side, an intermediate product P having a desired aspect ratio can be reliably obtained.

Further, the material to be treated W as defined in claim 4
May be a discharge disk 14 as shown in FIG. In this case, the intermediate product P located on the discharge disk 14 rolls under centrifugal force, and is eventually sent to the inner wall portion of the processing tank 3 and sent out from the discharge port 8 to the outside.

Furthermore, in the above-described embodiment, the discharge stirring blade 13 or the discharge disk 14 is provided to continuously discharge the processed material W (intermediate product P) subjected to the sizing treatment. The processing tank 3 does not have a bottom portion, so that the processing target material W (intermediate product P) can be continuously discharged from this portion. In this case, the discharge stirring blade 13 or the discharge disk 14 is not required, and the cost of the apparatus can be reduced.

[0032]

According to the present invention, it is possible to provide a novel sizing machine 1 which can perform continuous operation without causing overload stop and can perform sizing in a shorter time. .

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing a use state of a granule sizing machine of the present invention.

FIG. 2 is a longitudinal sectional view showing a processing tank and a grain sizing member in a partially enlarged manner.

FIG. 3 is a plan view showing a processing tank and a sizing member.

FIG. 4 is a plan view showing a sizing plate.

FIG. 5 is a perspective view, partially broken away, showing a particle sizer in which a particle sizer, a stirring blade and a dispersion plate are provided in multiple stages in the vertical direction.

FIG. 6 is a vertical sectional side view showing an existing granule sizing machine of a type in which a material to be treated is continuously discharged by a jet fluid.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Granulator 2 Casing 3 Processing tank 5 Granulator 6 Lid 7 Input port 8 Discharge port 9 Regulator plate 10 Shaft 11 Dispersion plate 12 Stirrer blade 12a Bent part 13 Discharge stirrer blade 14 Discharge disc 20 Granulation Machine 21 Hopper M Motor P Intermediate product W Material to be treated

Claims (4)

[Claims] 1. An apparatus for feeding a material to be extruded in the form of coarse particles into a cylindrical processing tank and sizing the material to be granulated by a stirring blade rotating in the processing tank. Immediately below the rotation trajectory of the tip portion, a sizing plate that protrudes in an inner flange shape from the processing tank inner wall is provided, and a disc-shaped dispersion plate that rotates together with the stirring blade is provided above the stirring blade. And sizing machine. 2. The granulator according to claim 1, wherein the stirring blade is formed so that a tip end thereof is bent upward along the inner wall of the processing tank. 3. The sizing machine according to claim 1, wherein the sizing plate, the stirring blade, and the dispersion plate are provided in multiple stages in a vertical direction. 4. A stirrer or a disc for continuously discharging the sized material to be processed is provided near the bottom of the processing tank. The sizing machine described.