JP2884515B1 - Fine grinding equipment - Google Patents

Abstract

An object of the present invention is to provide a fine pulverizing apparatus capable of performing fine pulverization with a high crushing efficiency while having a compact configuration and without destroying material characteristics inherent to raw materials. SOLUTION: A main crushing chamber 3 is composed of a rotor 7 and a stator 8 having a concave inner wall which covers the outer periphery of a rotation region of a blade 9 provided at an end of the rotor and both front and rear surfaces with a gap therebetween. A large number of grooves 8g are provided on the inner wall in a direction intersecting the circumferential direction. A coarse crushing section 5 is disposed on the side of the raw material supply section 2 of the main crushing chamber 3, and the coarse crushing section 5 has a radius smaller than the rotation radius of the blade 9 and has a radius that increases toward the main crushing chamber 3. And A classifying section 6 is arranged on the product discharge section 4 side of the main crushing chamber 3, and the classifying section 6 forms a narrow classifying gap on the outer circumference of the rotors 14 and 15 having a radius smaller than the rotation radius of the blade 9. Constitute.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pulverizing apparatus for pulverizing a solid material into fine particles, and more particularly, to a pulverizing device which has a compact structure and high crushing efficiency without destroying material characteristics. To a fine pulverizing device.

[0002]

2. Description of the Related Art Pulverization of a raw material of a solid material into a powdery form is carried out in a wide range of industrial fields such as foods, pharmaceuticals, mining and chemical industries. In particular, in the pulverization process performed in the field of foods and pharmaceuticals, the particle size distribution and particle shape of the powdered granules are kept constant and the raw material characteristics unique to the raw material are not altered as much as possible during the pulverization process into the granules. It is important to do so.

Conventionally, there has been an axial flow type high-speed rotary mill as a typical fine pulverizer used from such a viewpoint, and there are a jet mill type and a turbo mill type as the axial flow type high-speed rotary mill.

[0004] In the former jet mill system, a solid material is injected into a pulverizing treatment zone together with high-pressure compressed air, and the raw materials collide with each other and rub against each other with a high-speed air stream to form a fine powder. However, in order to operate the jet mill system, it is necessary to stably supply a large amount of high-pressure compressed air. High was invited.

In the latter turbo mill system, a crushing chamber is provided inside a cylindrical liner with a rotor with blades rotating at a high speed, an inlet spiral chamber is provided on the raw material supply side of the crushing chamber, and an outlet spiral chamber is provided on the powder product discharge side. A swirl chamber is attached, and the raw material is supplied from the inlet swirl chamber to the pulverizing chamber, and the raw material is beaten by a high-speed rotating blade or collided with the wall of the cylindrical liner by a high-speed airflow generated by centrifugal force. Into a fine powder. However, there is a disadvantage that the crushing efficiency is low and the running cost is high because the crushing is based on the collision principle.

[0006] In order to improve the turbo mill system having a low crushing efficiency, there is a method in which raw materials are coarsely crushed in advance by a coarse crushing device and then supplied to a turbo mill. However, an extra coarse crushing device is required. As a result, the size of the apparatus is increased, and the cost has to be increased significantly.

[0007] On the other hand, when the tastes of consumers have diversified as in recent years, it has been forced to switch to multi-product small-quantity production. However, since the conventional jet mill and turbo mill described above have too large equipment, if they are directly applied to the production of a large variety of small types, not only the equipment cost but also the running cost increases, and it is not possible to respond in a satisfactory state. .

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a fine pulverizing apparatus having a so-called turbo mill system as a basic structure and capable of performing fine pulverization with high crushing efficiency while having a compact structure. is there. Another object of the present invention is to provide a fine pulverizing apparatus which enables fine pulverization without destroying the material characteristics inherent to the raw material.

It is still another object of the present invention to provide a fine pulverizing apparatus which can easily adapt to the production of a large variety of small quantities without increasing equipment costs and running costs.

[0010]

The pulverizing apparatus of the present invention comprises:
Leading , outer and trailing edges of the rotor and blades at the end of the rotor
And a stator in which a number of grooves intersecting with the circumferential direction are arranged in a circumferential direction on a concave inner wall provided so as to cover the outer periphery of the rotation region, and a raw material supply unit is provided on one of the side portions of the main grinding chamber. A rotor and a stator having a radius smaller than the rotation radius of the blade and increasing toward the main crushing chamber between the raw material supply section and the main crushing chamber. A coarse crushing section is arranged, and a classifying section is formed between the main crushing chamber and the product discharge section, where a narrow classifying gap is formed between an outer periphery of a rotor having a radius smaller than a rotation radius of the blade. It is characterized by having done.

In the above configuration, the coarse crushing section is configured such that the radius of the rotor and the stator is smaller than the rotation radius of the blade of the main crushing chamber and expands toward the main crushing chamber. The primary crushing of coarse powder is performed by compressing and shearing in a range from a low peripheral speed to a medium peripheral speed lower than the peripheral rotational speed of the blade in the main crushing chamber.

In the next main crushing chamber, a blade rotating at a high peripheral speed generates a high-speed airflow spirally radially outward around the rotation axis by inertia force and centrifugal force in the rotation direction. The main crushing chamber is brought into a negative pressure state. Due to the negative pressure of the main crushing chamber, coarse powder generated in the coarse crushing section is sucked toward the main crushing chamber, and the coarse powder collides with each other in a process of being accelerated outward in the radial direction by a high-speed airflow, or is beaten by a blade. In this way, while repeatedly impacting and reflecting between the blade and the stator, a strong impact force and a shearing force are applied to finely pulverize.

Further, since the inner wall of the stator has a large number of grooves in a direction intersecting with the rotation direction of the blade, when the coarse powder accelerated at high speed repeats collision and reflection as described above,
In order to further promote the pulverization action under a stronger impact force, shearing force, and compression force, the crushing efficiency can be improved by synergizing these actions. The air-flow crushing process with high crushing efficiency can reduce the mixing ratio of air to the raw material as much as possible. Damage can be suppressed.

Further, since the classifying action in the classifying section is performed while applying a shearing action in a narrow classifying gap formed between the rotor and the rotating rotor, the classifying effect can be further improved. In addition, in the crushing device of the present invention, in addition to having the high crushing efficiency as described above, the gap between the blade and the stator in the main crushing chamber is formed in a concave shape, and the powder is transferred in a zigzag shape. The linear distance in the axial direction can be further reduced, and the device can be made compact.

In the fine pulverizing apparatus of the present invention, when the coarse pulverizing section, the main pulverizing chamber, and the classifying section have a modular structure capable of being separated from each other, the number of the main pulverizing chambers and the combination of the rotor and the stator are particularly easy. Can be changed to Therefore, equipment costs and running costs can be improved by selecting the appropriate number of main crushing chambers and the combination of rotor and stator according to the type of raw material, the type of granular material, the amount of granular material produced, and the like. It can be easily applied to the production of high-mix low-volume products without increasing the production cost.

[0016]

FIG. 1 is a longitudinal sectional view showing an example of a fine pulverizing apparatus according to the present invention. 1 is a horizontally supported rotating shaft, 2 is a raw material supply unit for solid raw material, 3 is a main crushing chamber for crushing the solid raw material, and 4 is a product discharge from which the crushed fine powder is discharged. Department.

In the illustrated embodiment, three main pulverizing chambers 3 are connected in series, and a coarse pulverizing section 5 for previously processing a solid material into coarse powder is provided on the raw material supply section 2 side. A classifying unit 6 is provided on the discharge unit 4 side for classifying only the fine powder granulated to a certain particle size. Independent casings 30, 40, 50, and 60 are provided for the main crushing chamber 3, the product discharge section 4, the coarse crushing section 5, and the classifying section 6, respectively. , A coarse crushing section 5 and a classifying section 6 have a modular structure that can be separated independently together with the casings 30, 40, 50 and 60.

The rotating shaft 1 is provided laterally so as to penetrate the inside of the apparatus, and both shaft ends are supported by casings 40 and 50 on both outer sides via bearings 41 and 51. A pulley 70 is fixed to one shaft end of the rotating shaft 1, and rotational power is input to the pulley 70 from a motor (not shown) via a belt. The power input means may be a pulley and a belt, a sprocket and a chain, a plurality of gears, or a motor directly connected.

In the raw material supply section 2, a coarse crushing section 5 is provided.
It is provided so that it may communicate with. The coarse crushing unit 5
It is composed of a rotor 11 fixed on the rotating shaft 1 and a stator 12 mounted inside the casing 50, and has a module structure in which only the coarse crushing section 5 can be independently separated.

The outer peripheral surface of the rotor 11 and the inner peripheral surface of the stator 12 in the coarse pulverizing section 5 have the same radius as the main pulverizing chamber 3.
Are formed in a truncated conical shape in which the radius of rotation is smaller than the rotation radius of the blade 9 provided in the main grinding chamber 3 and gradually increases toward the main grinding chamber 3. The inclination angle between the outer peripheral surface of the rotor 11 and the inner peripheral surface of the stator 12 with respect to the axial direction is shown in FIG.
As shown in FIG. 5, the rotor 11 is inclined at an angle larger than that of the stator 12, and the gap between the rotor 11 and the stator 12 is formed to be narrower toward the main crushing chamber 3 side.

As shown in FIGS. 2 and 3, a plurality of fins 11a are formed on the outer peripheral surface of the rotor 11 so as to extend in the axial direction, and the inner peripheral surface of the stator 12 is also extended in the axial direction. Many grooves 12g are provided. The extending direction of the fins 11a and the grooves 12g is preferably provided along the axial direction of the rotating shaft 1 as shown in the figure, but if the fins 11a and the grooves 12g intersect with the circumferential direction, the extending direction is It can be at an angle.

In the illustrated embodiment, the rotor 11 is of a blade type provided with the fins 11a. However, instead of the blade type, the rotor 11 may be of a crash type provided with a large number of grooves like the stator 12.

In the coarse pulverizing section 5, as described above, the rotor 11
And the radius of the stator 12 is smaller than the rotation radius of the blade 9 of the main crushing chamber 3, and expands toward the main crushing chamber 3. The powder is primarily crushed into coarse powder by being compressed and sheared in a range from a low peripheral speed to a medium peripheral speed lower than the peripheral rotational speed of the blade in the grinding chamber. Further, the rotor 11 and the stator 1
2 is formed so as to be narrower toward the main pulverizing chamber 3, the above-mentioned coarse powdering process can be performed efficiently.

The next main crushing chamber 3 is provided with a rotor 7 on a rotating shaft 1.
And a blade 9 is attached to the outer end of the rotor 7. On the other hand, the stator 8 is mounted on the casing 30 side, and the inner wall surface of the stator 8 is formed in a concave or trapezoidal shape so as to surround the outer circumference of the rotation range of the blade 9 and both the front and rear surfaces. On the outer periphery of the casing 30, a cooling jacket 13 through which cooling water circulates is provided. The main crushing chamber 3 has a modular structure that can be separated independently like the coarse crushing section 5, and in the illustrated example, three main crushing chambers 3 are connected in series in the axial direction.

As shown in detail in FIGS. 4 and 5 together with FIG. 1, the inner wall surface of the stator 8 has a large number extending in a direction intersecting its circumferential direction (ie, a direction intersecting the rotation direction of the blade 9). Are provided so as to be arranged in the circumferential direction. The extending direction of these grooves 8g is preferably a direction orthogonal to the circumferential direction of the inner wall surface of the stator, that is, a direction orthogonal to the rotational direction of the blade 9, as shown in the illustrated embodiment. If it is, it is not always necessary to be orthogonal, and it may be slightly oblique from the orthogonal direction.

The illustrated stator 8 is formed by joining two half members 8a and 8b inside a cylindrical casing 30 to facilitate workability (see FIGS. 1 and 4). . One half member 8a forms an inner wall portion facing the leading edge of the rotation region of the blade 9 and an inner wall portion facing half of the outer periphery of the rotation region, and the other half member 8b forms a rear portion of the blade 9 after the rotation region. An inner wall portion facing the edge and an inner wall portion facing the other half of the outer periphery of the rotation region are formed.

The main crushing chamber 3 having the above-described structure is provided with a rotating shaft 1.
Drives the grinding blade 9 to rotate at a peripheral speed of 40 to 100 m.
/ Sec at a very high speed, the inertial force and the centrifugal force in the direction of rotation generate a high-speed airflow spiraling around the rotating shaft 1 and radially outward, and the inside of the main grinding chamber 3 is in a negative pressure state. To Due to the negative pressure in the main crushing chamber 3, the coarse powder generated in the coarse crushing section 5 is sucked into the main crushing chamber 3, and the coarse powder collides with each other while being accelerated to the outside in the radial direction by a high-speed airflow, or is beaten by the blade 9. And collide with the inner wall surface of the stator 8.

Further, the coarse powder is finely pulverized by being subjected to a strong impact force and a shearing force while repeatedly colliding and reflecting between the blade 9 and the stator 8.
Further, since the inner wall of the stator 8 has a large number of grooves 8g in a direction intersecting with the rotation direction of the blade 9, even when the coarse powder accelerated at high speed repeats collision and reflection, a stronger impact force is obtained.
Since the pulverizing action is further promoted by receiving the shearing force and the compressive force, the crushing efficiency can be remarkably improved.

In addition, the air-flow crushing process having a high crushing efficiency can significantly reduce the mixing ratio of air to the raw material, so that the oxidizing effect of the granular material by the air heated by frictional heat can be suppressed. As a result, the material characteristics of the raw material can be prevented from being altered.

The illustrated blade 9 has inclined surfaces 9a, 9a on the right and left sides of the front surface in the rotation direction R of the rotor 7, respectively.
9a (see FIG. 5B). This inclined surface 9
In a, the direction of reflection when the powder is hit is efficiently directed to the radial inner wall surface of the stator 8, so that the crushing efficiency can be further improved. If such an inclined surface 9a is also provided at the radially outer end of the blade 9, the direction of reflection when the powder is hit is efficiently directed to the inner peripheral surface of the stator 8, so that the crushing is performed. Improve efficiency. The action of efficiently directing the powder toward the inner peripheral surface of the stator 8 is such that the entire blade 9 is slightly inclined with respect to the radial direction and directed toward the inner peripheral surface as shown by a broken line in FIG. You may do so.

The blade 9 may be integrally fixed to the rotor 7 by welding or the like, or may be configured to be replaceable and detachable. In particular, when the crushed raw material is hard, the blade 9 is easily worn out at an early stage.
If it is configured to be replaceable with respect to, the maintenance property can be improved by replacing each wear.
The material of the blade 9 is preferably a material having high wear resistance, such as a grindstone, ceramic, or an industrial diamond.

The mounting height of the blade 9 with respect to the rotor 7 may be such that the radially outer end of the blade 9 projects slightly outward from the outer peripheral surface of the rotor 7 as shown in the illustrated example. The radially outer end of the blade 9 and the outer peripheral surface of the rotor 7 may be flush with each other.

The size of the gap formed between the inner wall surface of the stator 8 and the blade 9 is not particularly limited. But,
As shown in FIGS. 1 and 2, the gap formed between the inner wall surface in the radial direction of the stator 8 and the leading edge and the trailing edge of the rotation region of the blade 9 may be narrower toward the outer side in the radial direction. preferable. The gap formed between the inner peripheral wall surface of the stator 8 and the outer periphery of the rotation range of the blade 9 is as follows.
It is preferable that the gap is equal to or smaller than the gap formed at the outermost end in the radial direction.

In the present invention, the radius from the center of the rotating shaft 1 to the inner peripheral surface of the inner wall of the stator 8 and the rotating radius of the blade 9 differ depending on the raw material to be pulverized, and are not particularly limited. However, when used as a general-purpose small machine, for example, it is preferable to set the range to 200 to 1200 mm. The gap between the stator 8 and the blade 9 varies depending on the radius of rotation of the blade 9, but when the radius of rotation is set in the range of 200 to 1200 mm as described above, the radius of rotation in the lower half region of this range is 10 mm. It is preferable that the rotation radius of the upper half region be within 20 mm.

The angle formed by the inner wall side surface (radial inner wall surface) of the stator 8 and the front and rear edges of the blade 9 with respect to the direction (radial direction) perpendicular to the rotating shaft 1 is as follows. Although it is not particularly limited as long as it is wide in the direction inside and narrows toward the outside in the radial direction, for example, 3 to
It is preferable that the angle be in the range of 10 °.

The depth of the groove 8g provided in the stator 8 is not particularly limited. However, the groove 8g provided on the radial side surface of the stator 8, that is, the groove 8g in a region facing the front edge and the rear edge of the rotation region of the blade 9, is described with reference to FIGS.
As shown in FIG. Also, the inner peripheral surface of the stator 8 (the inner peripheral surface having the maximum radius), that is, the groove 8g in the region facing the rotation region outer periphery of the blade 9 is the same as the depth of the radially outermost groove 8g. Or it is preferable to make it deeper. The depth of these grooves 8g is preferably in the range of 2 to 8 mm.

When the gap between the inner wall surface of the stator 8 and the rotation range of the blade 9 is large on the inside in the radial direction and narrows toward the outside as described above, the gap between the stator 8 and the blade 9 Since the collision energy and the reflection energy that are repeatedly applied are initially weak and gradually increased, it is possible to gently pulverize the raw material without damaging the material properties of the raw material. Further, if the depth of the groove 8g is increased toward the outside in the radial direction, a greater shearing force is applied to the granular material as it moves to the outside in the radial direction. , And can be processed efficiently.

The inner peripheral wall surface of the stator 8 and the blade 9
By minimizing the gap formed between the outer peripheral edge of the rotating region and the outer peripheral edge, the powder and granules conveyed to the outer end in the radial direction are moved to the adjacent main crushing chamber 8 or the classifying section 6. It is effective in smoothing the operation. If the gap between the inner peripheral wall surface of the stator 8 and the outer peripheral edge of the rotation region of the blade 9 is larger than the radial clearance, the powder or granular material tends to stay in the inner peripheral wall surface of the stator 8, which is not preferable. .

The number of the main crushing chambers 3 is not necessarily limited to three as shown in the figure, but may be one, or two or four or more.
The number of the units may be appropriately selected according to the characteristics of the solid raw material to be pulverized, the target particle size of the granular material, the production amount of the granular material, and the like. When a plurality of main crushing chambers 3 are provided, they may be connected in series in the rotor axial direction, and the spacer rotor 10 may be interposed between adjacent main crushing chambers.
The plurality of main crushing chambers 3 may be combined with those having different performances according to the particle size of the granular material, the production amount, and the like, for example, a combination of a medium crushing capacity and a fine crushing capacity.

The last classifying section 6 is provided between the main crushing chamber 3 and the product discharge section 4. In the example of FIG. 1, the classifying section 6 includes two disk-shaped rotors 14 and 15 having different outer diameters.
Are provided in series with the rotating shaft 1, of which the former rotor 14 forms a classifying gap with the discharge-side inner end 8 e of the stator 8 of the rearmost main crushing chamber 3, and the latter rotor 15 has a casing 60. And a gap for classification having a smaller size than the gap on the rotor 14 side.

Further, as shown in detail in FIG. 6, the rotor 14 is provided with a plurality of arc-shaped long holes 14a at a plurality of positions along the circumferential direction in the radial direction, and the rotor 15 has a small Notches 15a are provided at a plurality of locations.
The long holes 14a of the rotor 14 are used to recirculate the fine particles to the main pulverizing chamber 3, and the fine particles that have passed through the gap between the outer peripheral edge of the rotor 14 and the discharge-side inner end 8e of the stator 8 When the fine particles cannot pass through the gap between the opening 15 and the opening 16 of the casing 60, the fine particles are returned to the main pulverizing chamber 3 through the long holes 14a to be subjected to the re-pulverizing process.

The classifying operation in the classifying section 6 is performed by the rotors 14 and 1
5 are rotated, and the discharge-side inner end 8 is stationary.
e. Since the shearing is performed in the classification gap between the casing opening 16 and the classifier, the classification can be performed so as to minimize the variation in the particle size distribution.

That is, according to the classifying section 6 described above, the fine powder discharged from the last main pulverizing chamber 3 at a high speed is supplied to the rotor 14.
While partially passing through the gap between the discharge side inner end 8e and
While repeating the cycle to recirculate the large coarse particles that could not pass through the long holes 14a to the main pulverizing chamber 3 again, only the fine particles having a predetermined particle size are transferred between the next rotor 15 and the casing opening 16. Pass through the gap and classify to the target particle size.

The classifying section 6 is modularized from the combination of the rotors 14, 15 and the casing 60 like the other main crushing chambers 3 and the like, and can be separated independently. As the constituent members such as the rotors 14, 15 and the casing 60, it is preferable that all of the members or only a portion corresponding to the classifying gap are formed of a highly wear-resistant grindstone, ceramic, industrial diamond, or the like.

FIG. 7 shows a pulverizing apparatus according to another embodiment of the present invention. In FIG. 7, components denoted by the same reference numerals as those in the embodiment of FIG. 1 indicate the same components, and thus redundant description will be omitted.

In this embodiment, the point different from the apparatus of FIG. 1 is that the inner wall surface of the stator 8 forming the first main crushing chamber 3 connected to the coarse crushing section 5 faces the leading edge side of the rotation region of the blade 9. The difference is that the radial length (skirt length) differs between the inner wall portion and the portion facing the rear edge side.
That is, the skirt length of the inner wall portion of the blade 9 facing the trailing edge side of the rotation region is shorter than that of the inner wall portion facing the leading edge side.

The flow resistance is reduced by shortening the skirt length of the stator 8 on the trailing edge side of the rotation region, and the flow of the powder between the inner wall surface of the stator 8 and the blade 9 is made smooth. Can be. Further, a feed rotor 17 that rotates integrally with the rotor 7 is provided on the spacer 10 between the adjacent main crushing chambers 3, 3, and the movement of the powder between the main crushing chambers is performed by the action of the feed rotor 17. It is even smoother.

The stator 8 of the main crushing chamber 3 has a three-part structure, and the spacer member 8c is interposed between the left and right half halves 8a and 8b to further improve the workability of the stator 8. I try to improve.

The point that two rotors 14 and 15 are provided in the classifying section 6 is similar to the embodiment of FIG. 1, but in this embodiment, the scraping blades 18 are provided on the rotating shaft 1 in the product discharge section 4. Is provided, and the provision of the rake-out blades 18 further facilitates the discharge of the fine powder particles from the classifying unit 6. Further, spacers 20 and 21 are interposed in the rotors 14 and 15 on the rotating shaft 1, respectively, and by adjusting the number of the spacers 20 and 21,
The size of the gap between the rotor 14 and the stator discharge side inner end 8e and the size of the gap between the rotor 15 and the casing opening 16 can be adjusted. Spacer 2
By interposing 0 and 21, various types of rotors 14 and 15 having different diameters do not need to be prepared.

FIGS. 8, 9 and 10 show the main parts of a fine pulverizing apparatus according to still another embodiment of the present invention.
In the embodiment of FIG. 8, the stator 8 is rotatable, and power is input from an external drive shaft 25 via a gear 26 to be driven to rotate in the opposite direction to the rotor 7. By the relative rotation of the stator 8 with respect to the rotor 7, the effect of crushing the solid material can be further improved. In particular, the shape of each granular material can be a rounded shape having no sharp corners. Further, in the case of a fibrous raw material, there is a limit to the fiber length that can be crushed in the conventional technology, but the fiber length can be finely pulverized beyond the limit to an extremely short fiber length.

The direction of rotation of the stator 8 may be the same as that of the rotor 7 in addition to the direction opposite to the rotor 7 as described above. Further, the stator 8 may be installed in a free rotation state without providing a rotation power input mechanism.

In the embodiment shown in FIG. 9, in a configuration in which a plurality of main crushing chambers 3 are connected, the feed rotor 17 between the two main crushing chambers 3 is not fixed so as to rotate integrally with the rotating shaft 1 and is free. It is supported to rotate. By supporting the feed rotor 17 in the free rotation state in this manner, the movement of the powder and granules between the main pulverizing chambers can be made smooth depending on the type of the raw material.

The embodiment shown in FIG. 10 has a structure in which a plurality of main crushing chambers 3 are connected to each other.
A recirculation pipe 26 is provided to recirculate a part of the pulverized particles to the raw material supply unit 2 again.

By providing the reflux pipe 26 for refluxing from the last main crushing chamber 3 to the raw material supply section 2 as described above, it is possible to supply the raw material excessively or to supply the raw material which is hard to be crushed. In the case where a large amount of coarse particles that cannot pass through the gap of the classifying unit 6 are generated, the coarse particles are refluxed to the raw material supply unit 2 so that an excessive load is not applied, and the granular material having the target particle size is reduced. Can be discharged in a fixed amount.

As described above with reference to FIG. 5, it is standard that the groove 8g provided in the stator 8 of the main crushing chamber 3 is provided so that its extending direction is orthogonal to the circumferential direction. It may be slightly oblique from the direction of the right angle. When the direction of the groove 8g is made oblique as described above, it is preferable that the direction of the groove 8g be always perpendicular to the flow direction of the powdery material reflected by the rotating blade 9.

The flow of the granular material reflected by the blade 9 rotating at high speed in the main crushing chamber 3 becomes a spiral shape which turns in the circumferential direction while gradually displacing the annular space around the rotating shaft 1 outward in the radial direction. ing. Therefore, when the extension direction of the groove 8g is slightly inclined as described above,
As shown in FIG. 11, 3 with respect to the direction orthogonal to the circumferential direction.
It is preferable to form an angle [theta] in the range of [degree] to 12 [deg.]. By adopting such a direction, it is possible to prevent stagnation of the granular material and to make the flow smooth, so that unnecessary load can be prevented from being generated.

As described with reference to FIG. 5, when the inclined surfaces 9a, 9a are provided on the left and right sides of the front surface of the blade 9 in the rotation direction R, the powder material reflected by the blade 9 is removed by the stator 8. In order to efficiently collide with the inner peripheral surface of the crusher, the crushing efficiency can be improved. As shown in FIGS. 12 (A) and 12 (B), the improvement of the blade shape is achieved by forming convex ridges 9b, 9b or substantially V-shaped on the left and right sides on the front side in the rotation direction R. The groove of
When the direction of these ridges 9b or grooves is inclined radially inward from the width center of the blade 9 toward the left and right side edges,
Since the powder particles reflected from the ridges 9b or the grooves are efficiently collided with the inner peripheral surface of the stator 8, the pulverization efficiency can be improved. If these convex stripes 9b and V-shaped grooves are used together with the above-mentioned inclined surface 9a, the pulverization efficiency can be further increased.

As shown in FIGS. 8 to 10, the classifying section 6 has only one rotor 14 instead of the structure in which the double rotors 14 and 15 are provided as shown in FIGS. The classifier 27 may be made to face. In the case of the classifying plate 27, the classifying plate 27 is detachable from the casing 60, a plurality of classifying plates having different inner diameters are prepared, one of the classifying plates 27 is appropriately selected and replaced, and It is recommended that the classification gap can be adjusted.

By using such a detachable classifying plate 27, it is possible to easily adjust the particle size distribution of the granular material and to adjust the particle size distribution so as to be in a narrow range. In order to narrow the particle size distribution in this way, a classifying plate 2
It is desirable that the inside diameter of 7 (the inside diameter for forming the classification gap) be 60 to 80% of the inside diameter of the stator of the main crushing chamber 3. As a material of the classifying plate 27, it is preferable to use a grindstone, ceramic, industrial diamond, or the like having high wear resistance.

The classifying plate 27 may be rotated by an external power to rotate relative to the rotor 14.
Also, as shown in FIGS. 13A and 13B, a large number of ribs 27a that are inclined with respect to the radial direction are provided on the inner diameter portion facing the rotor 14 to form a classification gap. You may use what was done. As indicated by arrows in FIG. 13A, the ribs 27a perform a classification operation while reflecting the powdery material on the side wall surface, thereby classifying the pulverized powdery material to narrow the particle size distribution. be able to.

FIGS. 14A and 14B show an example in which the above-mentioned pulverizing apparatus of the present invention is arranged on a mounting table. FIG.
4 (A) and 4 (B), a fine pulverizing device 110 and a motor 120 are juxtaposed on the upper surface of
The power of 0 is transmitted to the fine pulverizing device 110 via the belt B. The product discharge section 4 of the pulverizing device 110 is provided with a discharge nozzle 4a on the side facing the motor 120.

A hopper 140 is installed above the motor 120, and a transfer chute 150 is extended from the discharge port 141 of the hopper 140 to the raw material supply unit 2 of the pulverizer 110. The solid material is supplied to the hopper 140, and the solid material is supplied from the outlet 141 of the hopper 140 via the transfer chute 150 to the fine pulverizer 1.
10 is supplied to the raw material supply unit 2 of the
In which a fine pulverization treatment is performed.

On the other hand, in the lower space of the mounting table 100, a product collection can 130 is installed corresponding to an intermediate position between the pulverizing device 110 and the motor 120, and a receiving port 131 of the product collecting can 130 is provided. It protrudes to the upper surface side and faces the outlet of the discharge nozzle 4a. Therefore, the powdery material pulverized by the pulverizing device 110 as described above is discharged from the discharge nozzle 4a and collected in the product collecting can 130.

The fine pulverizing device 110, the motor 120, and the product collecting can 130 are separately disposed on the upper surface and the lower space of the mounting table 100, respectively, so that a large number of devices can be compactly installed in a narrow space. Therefore, it is possible to advantageously work to improve workability.

The above-described pulverizing apparatus of the present invention can be applied to any pulverizing treatment of solid raw materials performed in foods, pharmaceuticals, mining industry, chemical industry and the like. In particular, it can be preferably used for crushing foods such as cereals, vegetables, tea leaves, herbs, etc., and can perform crushing treatment that is gentle to raw materials without deteriorating the material characteristics of raw materials.

[0066]

As described above, according to the fine pulverizing apparatus of the present invention, it is possible to perform fine pulverization with high crushing efficiency without destroying the material characteristics inherent to the raw material, while having a compact structure. Further, when the coarse crushing section, the main crushing chamber, and the classifying section have a module structure that can be separated from each other, it can be easily applied to the production of a large number of types and small quantities without increasing the equipment cost and the running cost.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a pulverizing device of the present invention.

FIG. 2 is a longitudinal section showing a main part of a coarse crushing section of the fine crushing apparatus.

FIG. 3 (A) shows the stator of the coarse crushing unit in FIG.
FIG. 2B is a view as viewed from an arrow, and FIG. 2B is a view as viewed from an arrow b in FIG. 2.

FIG. 4 is a longitudinal section showing a main part of a main pulverizing section of the fine pulverizing apparatus.

5A is a view as viewed in the direction of the arrows cc in FIG. 4, and FIG. 5B is a view as viewed in the direction of the arrows d in FIG.

FIG. 6 (A) is a view taken along the line ee in FIG. 1, and FIG.
It is an arrow view.

FIG. 7 is a longitudinal sectional view showing another embodiment of the pulverizing device of the present invention.

FIG. 8 is a longitudinal sectional view showing a main part of a pulverizing device according to still another embodiment of the present invention.

FIG. 9 is a longitudinal sectional view showing a main part of a pulverizing apparatus according to still another embodiment of the present invention.

FIG. 10 is a longitudinal sectional view showing a main part of a pulverizing apparatus according to still another embodiment of the present invention.

FIG. 11 is a cross-sectional view of a half inner wall surface of a stator constituting a main crushing chamber in the present invention, the inner wall surface on the side facing the front edge of the rotation region of the blade viewed from a plane orthogonal to the rotation axis.

12A is a cross-sectional view of the blade portion of the main crushing chamber according to the present invention, taken along the line ff in FIG. 12B, and FIG. 12B is a sectional view of the blade portion taken along the line ee in FIG. FIG.

13A and 13B show a classification plate constituting a classification unit in the present invention, wherein FIG. 13A is a front half view showing only one side from the center, and FIG.
Is a longitudinal sectional view.

FIG. 14 is a layout view when the fine pulverizing device of the present invention is arranged on an installation table with other auxiliary equipment, (A) is a front view,
(B) is a side view.

[Explanation of symbols]

Reference Signs List 1 rotating shaft 2 raw material supply section 3 main crushing chamber 4 product discharge section 5 coarse crushing section 6 classification section 7 rotor (of main crushing chamber) 8 stator 8g groove 9 blade (of main crushing chamber) 11 (of coarse crushing section) rotor 12 (coarse crushing part)
Stator 14, 15 (classifying unit) rotor 30, 40, 50, 60 Casing

Claims (4)

(57) [Claims] 1. In front of a rotor and a blade at the end of the rotor
The main crushing chamber is constituted by a stator in which a number of grooves intersecting with the circumferential direction are arranged in the circumferential direction on a concave inner wall provided so as to cover the outer periphery of the rotation region including the edge, the outer end and the trailing edge, and the side of the main crushing chamber. A raw material supply section is provided in one of the sections, and a product discharge section is provided in the other. A coarse grinding unit consisting of a rotor and a stator
Further, a fine pulverizing apparatus in which a classifying unit having a narrow classifying gap formed between the main grinding chamber and the product discharge unit and an outer periphery of a rotor having a radius smaller than the rotation radius of the blade is arranged. 2. The fine pulverizing apparatus according to claim 1, wherein a plurality of the main pulverizing chambers are connected in series in a rotor axis direction. 3. The fine pulverizing apparatus according to claim 1, wherein the coarse pulverizing section, the main pulverizing chamber, and the classifying section have a modular structure that can be separated from each other. 4. An interval between the concave inner wall surface and a leading edge and a trailing edge of the blade rotation area is widened radially inward, and narrowed radially outward, respectively. 4. The fine pulverizing device according to claim 1, wherein the depth of the groove provided on the concave inner wall surface facing the trailing edge is increased toward the outside in the radial direction. 5.