JPH0889782A - Granulating device - Google Patents

Abstract

PURPOSE: To produce an easily soluble granule free from the problem of wear and low in running cost. CONSTITUTION: This granulating device is constituted of a screen 15 having plural numbers of drilled holes 16, 16,... having a prescribed diameter and spring boards 8, 8,... for pressing a material on the screen. The direction of the holes 16, 16,... of the screen is selected so as to be 15-60 deg. in the angle formed by the axial center of the holes and the tangent at the outer peripheral part of the screen.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a granulating apparatus, and more specifically, it comprises a screen having a plurality of holes of a predetermined diameter and an extruding member such as a spring plate, which drives the extruding member. When the material is pressed against the screen, the material is extruded through the holes of the screen.

[0002]

2. Description of the Related Art Extrusion type granulators are well known in the art without mentioning literature names, and are roughly classified into blade type, roller type, screw type, etc. It has a screen for forming columnar products. It also has an extruding member for pressing the material against the screen. The extruding member is composed of, for example, a plurality of extruding blades when the granulating device is of a blade type, is similarly composed of a plurality of rollers when of a roller type, and is composed of a screw when of a screw type. The screen is generally formed as a cylindrical screen, and a plurality of holes provided on the entire circumference of the screen face the central direction. An extruding member, for example, an extruding blade, is provided inside the cylindrical screen, and its tip is pressed against the inner peripheral wall of the screen with a predetermined pressure to be rotationally driven. Therefore, when the material is put inside the cylindrical screen and is driven to rotate with the extruding blade being pressed against the screen, the material is pressed by the extruding blade against the inner wall of the cylindrical screen to form a cylindrical product from the hole of the screen. Is discharged.

[0003]

As described above, since it is possible to granulate by a conventionally known granulating apparatus comprising a screen and an extruding member, it is possible to use the granulating apparatus in the fields of pharmaceutical industry, food industry, fertilizer industry and the like. It is used a lot. However, there are drawbacks or points to be improved. For example, in order to extrude material from the holes in the screen, the material must be pressed onto the screen by means of an extrusion member, the holes in the screen pointing towards the center of the cylindrical screen in the direction of movement of the extrusion member or the direction of material movement. Since it is almost right-angled, it has the drawback that it cannot be pushed out unless it is pressed with a relatively large pressing force. When pressed with a large force, since the cylindrical screen is stationary, relative movement occurs between the cylindrical screen and the extruded member, a large frictional force is exerted, and the screen is prematurely worn. Since the extruded member can be formed to have a certain thickness, it can be provided so as to withstand abrasion. However, since the holes of the screen have been conventionally formed by punching, the thickness cannot be increased due to the processing, and it is worn at an early stage, which requires frequent replacement. Further, since a large frictional force acts between the screen and the extruding member, the power cost for driving the extruding member also increases. In general, powder is difficult to handle as it is, so it is granulated, but it is desired that it be easily dissolved when used. Ideally, for example, fertilizer should be easily dissolved after spraying, pharmaceuticals should be taken, and seasonings should be easily dissolved during cooking. By the way, according to the conventional granulating apparatus, since the pushing force of the extruding member is large as described above, the material is strongly pressed and solidified, the density becomes large, and it becomes difficult to melt. The present invention aims to provide a granulating apparatus that solves the above-mentioned drawbacks or problems of the conventional granulating apparatus. Specifically, the problem of wear is small, the running cost is low, and it is easy to melt. It is an object of the present invention to provide a granulating device capable of manufacturing a product.

[0004]

In order to achieve the above object, the present invention comprises a screen having a plurality of holes of a predetermined diameter and an extruding member for pressing a material against the screen. A granulating device in which at least one of a member and the screen is driven so that when the material is pressed against the screen, the material is extruded from the hole of the screen, and the direction of the hole of the screen is The angle formed by the axis of the hole and the tangent line at the outer peripheral portion of the screen is selected to be in the range of 15 to 60 degrees. The invention described in claim 2 is claim 1
The extruded member described is a spring plate of an extruded blade,
The invention according to claim 3 is provided with a cylinder having a screen portion in which a plurality of holes having a predetermined diameter are formed, and a screw driven in the cylinder. When the screw is rotationally driven, the material is moved forward. A granulating apparatus that is fed, compressed, and extruded from the holes of the screen part, wherein the direction of the holes of the screen part is
The angle formed by the axis of the hole and the axis of the cylinder is 15 to 60.
It is selected to be within the range of degrees.

[0005]

Function: For example, the tempered material is put into the screen. Then, either the extruding member or the screen, for example, the extruding member is driven. At this time, the holes in the screen are
Since the angle formed by the axis of the hole and the tangent line on the outer periphery of the screen is selected to be in the range of 15 to 60 degrees, the pushing member is driven so as to come into contact with the screen relatively lightly. The material is then pressed against the screen with a small force and is forced out of the holes in the screen. In the invention according to claim 3, the material is supplied to the cylinder and the screw is rotationally driven. The material is then forwarded, compressed, and extruded through holes in the screen portion of the cylinder. At this time, the direction of the holes of the screen portion is selected so that the angle formed with the axial direction of the cylinder is in the range of 15 to 60 degrees, and therefore the screw is pushed out using a screw having a small compression ratio or a small compression amount.

[0006]

EXAMPLES Examples of carrying out the present invention with a blade type granulating apparatus and a screw type granulating apparatus will be described below. FIG.
As shown in FIG. 1, the blade-type granulating apparatus 1 according to this embodiment includes a vertical cylindrical container 2. The inside of the cylindrical container 2 is the granulation chamber 3. The granulation chamber 3 is provided with a feed member 5 and an extrusion blade 7. The feed member 5 is composed of three blades 4, 4, ..., And the pushing blade 7 is similarly composed of four arms 6, 6 ,.
And the spring plates 8, 8, ...
The arms 6, 6, ...
1 is bent in an arc shape so as to be convex in the rotation direction when seen in a plan view, as shown in FIG. One of the arms 6, 6, ... Is fixed to the second output shaft 12, and the spring plates 8, 8 ,. Since the arms 6, 6, ... Are bent in a circular arc shape in this manner, the spring plates 8, 8, ... Are driven by smoothly contacting the inner surface of the cylindrical container 2, that is, the screen portion 15 to be described later in a surface contact manner. Will be.

A motor 10 is arranged below the cylindrical container 2. The output shaft of the motor 10 is provided with, for example, a speed reducer, and first and second output shafts 11 and 12 driven in opposite directions from the speed reducer extend coaxially upward. The feed member 5 is fixed to the first output shaft 11, and the pushing blade 7 is fixed to the second output shaft 12. In this way, the first and second output shafts 11 and 12 are driven in opposite directions, so that when the pushing blade 7 is rotationally driven in the direction of arrow A in FIG. Will be driven in the opposite direction.

A ring-shaped screen portion 15 is formed in the lower portion of the cylindrical container 2. This screen part 1
Reference numeral 5 is a position corresponding to the spring plates 8, 8, ... Of the extrusion blade 7, and a plurality of holes 16, 16 ,. As shown in FIG. 2, these holes 16, 16, ... Are oriented in the driving direction A of the spring plates 8, 8, ... Of the extrusion blade 7 or the moving direction of the material M.
That is, the tangent line T on the outer peripheral portion of the screen portion 15,
The angle θ formed by the axis D of the hole 16 is 15 to 15 in this embodiment.
It is selected in the range of 60 degrees. Such holes 16, 1
6, are exposed by the electron beam perforator over the entire circumference of the screen portion 15. The diameter of the holes 16, 16, ... Is determined by the particle size for granulation, and the arrangement is not particularly limited, but in this embodiment, the cylindrical material extruded from the holes 16, 16 ,. They are opened in a staggered pattern so that they do not interfere with each other.

Next, the operation of the above embodiment will be described.
Although not shown in the figure, for example, put the material in the hopper,
Binder, water, etc. are added as appropriate for conditioning. And the cylindrical container 2
It is supplied from above into the granulation chamber 3 of The motor 10 is started to rotationally drive the feed member 5 and the pushing vane 7. The material M supplied to the granulation chamber 3 is dispersed by the feed member 5 and reaches the extrusion blade 7 below. The spring plates 8, 8, ... At the tip of the pushing vane 7 are inscribed and driven in the screen portion 15 in a slightly bent state. Accordingly, the material M is pushed by the screen portions 15 by the spring plates 8, 8, ... And is extruded in a cylindrical shape from the holes 16, 16 ,. The product is processed by cutting, drying and sizing.

According to this embodiment, various effects can be obtained. For example, the holes 16, 16, ... Of the screen portion 15 are oriented in the moving direction A of the spring plates 8, 8, ... Of the pushing vane 7 to form the axis D of the hole 16 and the tangent line T on the outer peripheral surface of the screen portion 15. Since the angle θ formed by is selected in the range of 15 to 60 degrees, even if the pressing force of the spring plates 8, 8, ... Therefore, the frictional force is also small, and the screen portion 15 does not wear early as in the conventional case. Also, since the frictional force is small, the cost for power consumption is also low. Further, since the pressing force is small, the density of the granulated product is small, and the product is porous or porous and easily melted.

{Example 1}: "Preparation of materials" A gastrointestinal drug raw material was used as a material. The particle size distribution was as shown in Table 1. Table 1 Size (μm) Ratio (WT%) Average flow diameter 5.5 20 Average flow diameter 48.5 80 2% of binder was added as a binder, and 18% of water was added. "Preparation of Granulator" A granulator as shown in Figs. At this time, the hole 16 of the screen portion 15,
The diameters of 16, ... Are 0.5 mm, and 64 pieces per square centimeter are formed by an electron beam punch. Four kinds of angles θ of 15, 45, 60 and 90 degrees formed by the tangent line T and the hole axis D on the outer peripheral surface of the screen portion 15 were prepared.
The spring plates 8, 8, ... Of the push-out blade 7 are also prepared in two types, one having high spring rigidity and the other having small spring rigidity.
The test results are shown in Table 2. Table 2 θ Spring stiffness Torque (A) Collapse time (min) Test 1 15 Strong 15 16 Test 2 15 Weak 13 14 Test 3 45 Strong 14 17 Test 4 45 Weak 13 14 Test 5 60 Strong 15 18 Test 6 60 Weak 13 16 Test 7 (Conventional) 90 Strong 15 24 Test 8 (Conventional) 90 Weak 13 21 The driving torque was obtained from the motor current value, and the collapse time was based on the specified collapse test method at a temperature of 37 ° C. Obtained. From the above results, it can be understood that if θ is selected in the range of 15 to 60 degrees, granulation can be performed even if the spring rigidity of the spring plates 8, 8, ... Is weak. It can also be understood that the product obtained by the device of this example is easily dissolved. Furthermore, it can be seen that if the spring rigidity is weakened, the power consumption will be small.

Next, a second embodiment of the present invention in which the extruding member is a screw will be described with reference to FIG. The granulating apparatus 20 according to the present embodiment is roughly configured by a cylinder 21 and a screw 25 provided in the cylinder 21 so as to be rotationally driven. In the cylinder 21, the right side in the drawing is the supply part 22, and the left part is the screen part 23.
Has become. Then, a plurality of holes 24, 24, ... Are drilled through the entire circumference of the screen portion 23 by the electron beam punching machine described above. When the screw 25 is rotationally driven, the material M is sent to the left in the figure by the flight 27 of the screw 25. Therefore, the plurality of holes 24,
24, ... Are inclined so as to be easily pushed out. That is, the angle θ ′ formed by the axis D ′ of the holes 24, 24, ... And the axis J of the cylinder 21 is selected to be 15 to 60 degrees also in this embodiment.

As is well known, the screw 25 is composed of a screw shaft 26 and a flight 27 which is integrally spirally provided on the outer peripheral portion of the screw shaft 26. The shaft diameter of the screw shaft 26 is tapered in a portion corresponding to the screen portion 23. Therefore, the volume V between the flights 27 is reduced in the screen portion 23, and the material is compressed in the screen portion 23 to a predetermined compression ratio.

Although the driving device of the screw 25, the material supplying device, etc. are not shown in FIG. 3, when the screw 25 is rotationally driven and the material is supplied in a known manner,
The material is sent to the left in the figure by flight 27.
In the screen portion 23, it is extruded from the holes 24, 24, ... The product is dried, sized, etc. for commercialization. Also in this embodiment, the hole 2 of the screen portion 23 of the cylinder 21 is
4, 24, ... are selected so as to be inclined by 15 to 60 degrees with respect to the axis of the screw 21, so that it is clear that they can be extruded even if the compression ratio is small, that is, the driving torque of the screw 25 is small. Is. Also, since the compression ratio is small, the density of the product is small, and it is clear that a product that is easily melted can be obtained. Furthermore, according to the present embodiment, since kneading and tempering are performed in the supply section 22 of the cylinder 21, the effect of simplifying the hopper for tempering and the like can be obtained.

The present invention is not limited to the embodiments described above, but can be implemented in various forms. For example, although the extruding member is the extruding blade 7 and the screw 25 in the embodiment described above, the extruding member may be implemented by a plurality of rollers.
At this time, it is obvious that a plurality of rollers are driven to press the material against the screen portion 15 so that the material is pushed out through the holes 16, 16, .... Further, in the embodiment shown in FIGS. 1 and 2, the extrusion blade 7 is described as being driven to rotate, but since the movement of the extrusion blade 7 and the screen portion 15 is relative, the screen portion 15 may be driven. It can also be carried out. When the screen unit 15 is driven,
The cylindrical product extruded from the screen portion 15 can be cut by a blade fixed to the side portion of the screen portion 15. Further, in the embodiment shown in FIG. 3, the plurality of holes 24, 24, ... Are inclined by θ ′ only with respect to the axis, but the material is sent by the flight 27, and the flight 27 with respect to the axis. Since it is inclined, the angle θ ′ can be selected in consideration of the inclination angle of the flight 27.

[0016]

As described above, according to the present invention, the direction of the hole of the screen through which the material is extruded is such that the angle between the axis of the hole and the tangent to the outer peripheral portion of the screen is in the range of 15 to 60 degrees. Since it is selected, or the angle formed with the axial direction of the cylinder is in the range of 15 to 60 degrees, it is possible to granulate even if the extrusion member is pressed against the screen with a small pressing force. The effect peculiar to the present invention that the problem of abrasion of the screen and the extruded member is reduced can be obtained. Further, since the pushing force of the extruding member is small, the power consumption for granulation can be small, and further, the effect of being able to granulate a relatively easily melted product can be obtained.

[Brief description of drawings]

FIG. 1 is a diagram showing a first embodiment of the present invention, in which (a)
Is a plan view showing a part of the cross section, and (b) is
It is sectional drawing which shows only the principal part cut | disconnected by ab in (a).

FIG. 2 is an enlarged plan view showing a part of the screen portion of the first embodiment in section.

FIG. 3 is a sectional view showing only a main part of a second embodiment of the present invention.

[Explanation of symbols]

1, 20 Granulator 7 Extrusion blade (Extrusion member) 8 Spring plate 16 Hole θ Angle formed by shaft center of hole and movement direction of extrusion member

Claims (3)

[Claims] 1. A screen comprising a plurality of holes each having a predetermined diameter and an extruding member for pressing the material against the screen, wherein at least one of the extruding member and the screen is driven to remove the material. A granulating device in which material is extruded from the holes of the screen when pressed against the screen, wherein the direction of the holes of the screen is formed by an axis of the hole and a tangent line at an outer peripheral portion of the screen. A granulating apparatus characterized in that the angle is selected to be within a range of 15 to 60 degrees. 2. A granulating apparatus in which the extruding member according to claim 1 is a spring plate of an extruding blade. 3. A cylinder having a screen portion having a plurality of holes of a predetermined diameter and a screw driven in the cylinder. When the screw is rotationally driven, the material is sent forward. A granulating apparatus that is compressed and is extruded from the hole of the screen portion, wherein the direction of the hole of the screen portion has an angle between the axis of the hole and the axis of the cylinder of 15 to A granulating device characterized by being selected so as to fall within a range of 60 degrees.