JP2010201289A - Pulverizer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pulverizer having a simplified structure for easy maintenance and controlled in costs. <P>SOLUTION: The pulverizer includes a hopper 2 arranged at one end, a product outlet 4 arranged at the other end, a raw material grinding chamber 3 grinding a raw material supplied from the hopper 2 and discharging the ground product from the product outlet 4, at least one thin-plate-like rotor 8 arranged upstream of the raw material grinding chamber 3, a cylindrical space S1 containing the rotor 8 and a cylindrical classification space C arranged downstream of the cylindrical space S1 and having an inside diameter smaller than that of the cylindrical space S1, and the product outlet 4 is arranged concentrically with respect to the classification space C downstream of the classification space C and has an inside diameter smaller than that of classification space C. A raw material is pulverized by causing pieces of the raw material to collide with one another or causing the raw material to collide with the inside wall surface of the raw material grinding chamber 3 through an air flow generated by rotation of the rotor 8. A large number of concave and convex parts 10a are formed in the inside wall surface 10 of the cylindrical space S1 along the circumference. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention includes a raw material supply port provided on one end side, a product discharge port provided on the other side, and a raw material crushing chamber for crushing the raw material supplied from the raw material supply port and discharging it from the product discharge port. The present invention relates to a fine pulverizer.

  In the food industry that handles foods (green tea, soybeans, black tea, seaweed, etc.) and other industrial fields such as other pharmaceutical and organic chemical industries, more uniform fine powders are required, and various fine grinding devices are used. Has been developed.

  For example, the fine pulverization apparatus disclosed in the following Patent Document 1 by the present applicant includes a rotor formed of at least one thin plate disposed on the upstream side in the raw material pulverization chamber, and a cylindrical space in which the rotor is accommodated. A classification space having a cylindrical shape that is disposed downstream of the cylindrical space and has an inner diameter set smaller than the cylindrical space, and the product discharge port disposed on the downstream side of the classification space. .

  According to this fine pulverizing apparatus, the powder not reduced to a predetermined particle size is pulverized until the predetermined particle size is obtained, and a product classified to a desired particle size is taken out.

WO2008 / 093839A1

  However, when a finer fine powder product is required, the fine pulverization apparatus disclosed in the above prior art has been insufficient. Further, there is a problem of heat generation when pulverizing, and it is preferable that an increase in temperature can be suppressed particularly when pulverizing food.

  This invention is made | formed in view of the said situation, The subject is providing the fine grinding apparatus which can suppress a heat_generation | fever while being able to obtain a fine powder with a smaller particle size.

In order to solve the above problems, the pulverization apparatus according to the present invention is:
A raw material supply port provided on one end side, a product discharge port provided on the other side, a raw material crushing chamber for crushing the raw material supplied from the raw material supply port and discharging it from the product discharge port, A rotor formed of at least one thin plate disposed on the upstream side, a cylindrical space in which the rotor is accommodated, and a cylinder that is disposed on the downstream side of the cylindrical space and has an inner diameter set smaller than the cylindrical space A classification space having a shape and the product discharge port disposed on the downstream side of the classification space, and the raw materials collide with each other or the raw material and the inner wall surface of the raw material crushing chamber by an air flow generated by the rotation of the rotor. In the fine grinding device
On the inner wall surface of the cylindrical space, a large number of uneven portions are formed along the circumferential direction.

  The operation and effect of the pulverizing apparatus having such a configuration will be described. In the raw material grinding chamber of this fine grinding device, a rotor formed of a thin plate is arranged on the upstream side, and a high-speed air current is generated by rotating this rotor. Crushing is performed by colliding the raw materials or the raw materials and the inner wall surface of the raw material crushing chamber with this air flow, and so-called air flow crushing is mainly used. A classification space is provided downstream of the cylindrical space in which the rotor is accommodated, and the inner diameter of the classification space is set smaller than that of the cylindrical space. Further, a product discharge port is provided on the downstream side of the classification space. Therefore, the powder not reduced to a predetermined particle size is pulverized until the predetermined particle size is obtained. Thereby, the product classified to a desired particle size is taken out. Further, the main part arranged in the raw material crushing chamber is only the rotor, and the classification function can be dealt with by the shape of the classification space. That is, desired fine pulverization can be performed by devising the shape of the inner wall surface of the raw material pulverization chamber.

  A large number of irregularities are formed along the circumferential direction on the inner wall surface of the cylindrical space in which the rotor is accommodated. It is considered that the presence of the concavo-convex portion on the peripheral surface of the rotor further promotes the collision between the raw material and the inner wall surface of the raw material crushing chamber, thereby enabling further miniaturization. This point could be confirmed experimentally as described later. Moreover, the surface area was increased by forming the concavo-convex portion, thereby improving the heat dissipation effect. As a result, it is possible to provide a fine pulverization apparatus that can obtain fine powder having a smaller particle diameter and can suppress heat generation.

  The uneven portion according to the present invention is preferably formed by lining. By using the lining, it is possible to easily form the concavo-convex portion, which is advantageous in terms of cost. For lining, for example, it is possible to configure such that a member (fitted body) in which a concavo-convex portion is formed on the inner wall surface of the cylindrical member is fitted into the inner wall surface of the cylindrical space. In order to ensure the strength of the fitting body, it is preferable to provide the flanges integrally.

  The concavo-convex part according to the present invention is preferably formed so that the pitches of the concave part and the convex part are equal. By adopting such a configuration, it is possible to easily form the concavo-convex portion and to make the surface area as large as possible.

  The concave portion according to the present invention is preferably formed as a groove parallel to the axis of the rotor. By forming the groove in such a direction, pulverization can be promoted and the pulverized fine powder can be easily sent to the downstream side.

  A plurality of the rotors according to the present invention are arranged side by side along the rotation axis direction, and it is preferable to adjust the particle size of the product by configuring the arrangement interval of the rotors to be adjustable.

  The particle size can be adjusted by simply changing the rotor arrangement interval, and no special parts for adjusting the particle size are required. Therefore, it can be set as a simple structure.

In the present invention, a bypass path that is disposed outside the classification space and bypasses the front end side of the classification space from the upstream side of the classification space;
An internal path that is arranged inside the classification space and is connected to the upstream side of the classification space from the tip side of the classification space, and out of the crushed raw material, the coarse powder discharged to the bypass path side It is preferable that the apparatus is configured to return to the classification space again via the route.

  According to this configuration, the coarse powder that has not been pulverized to a predetermined particle size returns again to the upstream side of the classification space via the bypass path and the internal path. Since only the fine powder pulverized to a predetermined particle size is discharged from the product outlet, a product with a more uniform particle size can be obtained. In addition, the upstream side of the classification space should just be located upstream from the front end side of the classification space.

  The classification space according to the present invention preferably includes at least two classification space portions having different inner diameters, and is set so that the inner diameter becomes smaller toward the downstream side.

  By providing classification space portions with different inner diameters in stages in this way, it is possible to reliably prevent products that have not been pulverized to a predetermined particle size from being discharged from the product discharge port. You can get a product.

  In the present invention, the classification space is preferably provided with a tapered space portion adjacent to the cylindrical space so that the inner diameter gradually decreases as the distance from the cylindrical space increases.

  By comprising in this way, it becomes easy to send out the raw material grind | pulverized in the position of the rotor in the direction of the classification space.

  In the present invention, it is preferable that a plurality of connection portions for bypass path connection are provided outside the classification space and can be selected according to the grade of the raw material.

  According to this configuration, an appropriate bypass path can be set according to the grade of the raw material. Examples of the grade include the specific gravity of the raw material. Those having a relatively large specific gravity form a bypass path using a connecting portion disposed on the downstream side. Thereby, a grinding | pulverization process can be performed more efficiently.

Perspective view showing the appearance of the pulverizer Sectional view showing the internal structure of the pulverizer Plan view showing the shape of the rotor The figure which shows the result of the grinding | pulverization experiment by this invention (rice flour) The figure which shows the result of the pulverization experiment with conventional technology (rice flour) The figure which shows the result of the grinding | pulverization experiment by this invention (PET) The figure which shows the result of the crushing experiment by conventional technology (PET) Micrograph of powder obtained by the present invention Micrograph of powder obtained by conventional technology

  A preferred embodiment of a pulverizing apparatus according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing the external appearance of the fine grinding device, and FIG. 2 is a cross-sectional view showing the internal configuration of the fine grinding device.

<Configuration of First Embodiment>
First, the configuration of the pulverizing apparatus A according to the first embodiment will be described. In the pulverizing apparatus A, a roller 1 a is provided at the bottom of a substantially L-shaped base 1. In addition, a hopper 2 (raw material supply port) to which the raw material is supplied from the raw material supply device B for supplying the raw material, a raw material crushing chamber 3 for pulverizing the raw material charged from the hopper 2 into a fine powder, and the pulverized raw material as a product And a product discharge port 4 for discharging. The product discharged from the product discharge port 4 is sucked by the blower 21 and is collected by the cyclone dust collector 20 through the tube 5.

  Note that a positive pressure compressor or ring blower may be connected in order to eliminate the negative pressure in the cyclone device and facilitate the accumulation of fine powder. The compressor or ring blower can remove heat from the pulverized fine powder.

  As shown in FIG. 2, a drive main body 6 is provided on the base 1, and a motor 7 is installed therein. The rotating shaft 7a of the motor 7 is set in a horizontal state, and three rotors 8 are attached to the distal end side of the rotating shaft 7a. The arrangement interval of the three rotors 8 can be adjusted, whereby pulverization and particle size adjustment suitable for the characteristics of the pulverized raw material can be performed. The rotor 8 is accommodated in a cylindrical space S1 having a cylindrical shape, and the gap between the inner wall surface 10 of the cylindrical space S1 and the outer peripheral surface of the rotor 8 is set to be a small size.

  FIG. 3 is a plan view showing the shape of the rotor 8. The rotor 8 is formed with a hole 8a connected to the rotation shaft 7a at the center. Two key grooves for coupling are formed in the hole 8a. Further, the rotor 8 has eight narrow blade portions 8b projecting radially from the periphery of a small-diameter disk. These blade portions 8b are arranged at an equal pitch along the circumferential direction. In addition, about the number of blade parts 8b, etc., it can set suitably.

  The three rotors 8 may be configured such that the blade portions 8b have the same phase, or may be coupled while shifting the phase. The grain size can be made finer by shifting the phase.

  If the gap between the rotor 8 and the inner wall surface 10 is too narrow, it will cause heat generation, and if the raw material itself is large, it will cause trouble. On the other hand, if it is too wide, there is a problem that the pulverization efficiency is drastically reduced. Therefore, an appropriate dimension is set according to the target particle size.

  As shown in FIG. 3, the inner wall surface 10 has an uneven portion 10 a. A large number of concavo-convex portions 10 a are formed so as to face the tip of the blade portion 8 b of the rotor 8. For example, the concave and convex pitches w1 and w2 are the same, and w1 = w2 = 2 mm. Further, the depth w3 of the recess is about 2 mm. These specific dimensions can be changed as appropriate. Preferably, w1 = w2 = 1 to 3 mm, and more preferably w1 = w2 = 1.5 to 2.5 mm. Also about the depth, w3 = 1 to 3 mm is preferable, and 1.5 to 2.5 mm is more preferable. It is not always necessary that w1 = w2, and w1> w2 or w1 <w2.

  Moreover, as shown in FIG. 3, many uneven | corrugated | grooved parts 10a are formed along the circumferential direction of the inner wall surface 10. As shown in FIG. In the direction view of FIG. 3 (direction seen from the rotation axis of the rotor 8), the shape of the concavo-convex portion 10a is a shape like a rectangular wave, but is not limited thereto. The shape of the recess may be trapezoidal or triangular. A rounded shape may be used. Further, the groove forming direction of the recess is a direction perpendicular to the paper surface of FIG. 3, that is, a direction parallel to the axis of the rotor 8.

  By forming the concavo-convex portion 10a as described above, it was possible to obtain a fine powder having a smaller particle diameter, as can be seen from the experimental results described later. It is presumed that the pressure fluctuation in the raw material crushing chamber 3 becomes larger and the crushing efficiency is remarkably improved by such an uneven portion 10a. The time during which the raw material to be pulverized stays in the raw material pulverizing chamber 3 is shortened, and the load and heat generation are drastically reduced, making it possible to produce fine fine powder.

  Although it is the formation method of the uneven | corrugated | grooved part 10a, it can form by cutting the inner wall surface 10. FIG. Alternatively, the concavo-convex portion 10a may be separately manufactured as a special lining and formed so as to be attached to the inner wall surface 10 without the concavo-convex portion. In this case, a metal such as stainless steel is used as the material of the uneven portion 10a. When mounting separately, a member (fitted body) in which a concavo-convex portion is formed on the inner wall surface of the cylindrical member can be configured to fit into the inner wall surface 10. In order to ensure the strength of the fitting body, it is preferable to provide the flanges integrally.

  The classification space C is disposed adjacent to the downstream side of the cylindrical space S1 described above, and is arranged concentrically with the cylindrical space S1 in the order of the tapered space portion S2, the first classification space portion S3, and the second classification space portion S4. The The tapered space portion S2 has a tapered inner wall surface 11 whose inner diameter becomes smaller toward the downstream side.

  The first classification space S3 has a cylindrical shape with a smaller inner diameter than the cylindrical space S1. The tapered surface of the inner wall surface 11 of the tapered space portion S2 is formed so that the inner wall surface 12 of the first classification space portion S3 and the inner wall surface 10 of the cylindrical space S1 are continuously connected. The second classification space portion S4 has a cylindrical shape with an inner diameter smaller than that of the first classification space portion S3. A product discharge port 4 is provided at the tip of the second classification space S4, and the inner diameter of the product discharge port 4 is smaller than the inner diameter of the second classification space S4. It arrange | positions so that it may become concentric with the product discharge port 4 and each classification space part S3, S4. However, the product discharge port 4 is not necessarily arranged concentrically with the classification space portions S3 and S4.

  As described above, the classification space C is set such that the inner diameter becomes smaller toward the downstream side, and only the product pulverized to a predetermined particle size can be discharged from the product discharge port 4.

  Furthermore, the 1st connection part 15 is provided in the exterior of 1st classification space part S3, and the 2nd connection part 16 as the product discharge port 4 is provided in the exterior of 2nd classification space part S4. Further, the tip connection portion 17 is also provided at the tip of the second classification space portion S4. A pipe 22 is connected between the first connection portion 15 and the tip connection portion 17, and the bypass path P is configured by the pipe 22.

  As shown in FIG. 2, the first and second connection portions 15 and 16 are formed outside the classification space portions S3 and S4 in a tangential direction. In the classification space portions S3 and S4, the pulverized raw material is rotated and has a tangential direction corresponding to the rotation direction.

  The product discharge port 4 is provided so as to face the tangential direction, and the tube 5 is inserted into the product discharge port 4. By facing the tangential direction, the pulverized fine powder can be taken out smoothly.

  The product discharge port 4 (second connection portion 17) may be provided on the same surface as the surface on which the tip connection portion 17 is provided, in addition to the configuration arranged as described above. The product discharge port 4 should just be provided in the downstream of the said classification space S3, S4.

  An internal path Q is attached to the inside of the classification space S and inside the tip connection portion 17. The left end portion of the internal route Q is continuous with the bypass route P, and the right end portion is opened and connected to the classification space S.

  When the raw material is pulverized, fine powder pulverized to a predetermined particle size and coarse powder not pulverized to a predetermined particle size are mixed in the classification space S. Therefore, when the bypass path P as described above is provided, the heavy coarse powder moves to the bypass path P side and returns to the classification space S again via the internal path Q. As a result, the coarse powder is prevented from being discharged from the product discharge port 4, and only the finely pulverized fine powder is discharged from the product discharge port 4. The right end portion of the internal path Q faces the tapered space portion S2 or the first classification space portion S3, and thereby returns to the internal space S and enables pulverization again.

  The distal end connection portion 17 and the internal path Q are arranged so as to be concentric with the axial center of the internal space S. Thereby, the returned coarse powder can be efficiently reground and pulverized. Further, the product discharge port 4 is arranged around the tip connection portion 17. However, the arrangement of the product discharge port 4 and the tip connection portion 17 is not limited to this. The tip connection portion 17 and the internal path Q may not be arranged concentrically with the axial center of the internal space S.

  A lid 16a is used for the second connecting portion 16 and does not function in the modes shown in FIGS. When the bypass path P is configured, either the first connection unit 15 or the second connection unit 16 can be selected and used. Which is selected depends on the grade of the raw material. For example, in the case of a raw material having a relatively low specific gravity, the second connection portion 16 located on the downstream side is used, and in the case of a raw material having a relatively high specific gravity, the first connection portion 15 located on the upstream side is used. To do.

  As shown in FIG. 1, an auxiliary path 23 is provided and merges with the main path 24 at the merge point D. The main path 24 functions as a bypass path P together with the pipe 22. A ring blower (not shown) is connected to the auxiliary path 23 and feeds air in the direction of the arrow. For example, the temperature can be adjusted by feeding cooling air. Note that the auxiliary path 23 is not necessarily required and may not be provided.

  According to this configuration, the coarse powder can be reliably pulverized and discharged, and a product with a desired particle size can be reliably obtained. The coarse powder discharged from the first connection portion 15 to the bypass path P is guided in the direction of the arrow in the drawing by the action of negative pressure, and is reliably returned into the classification space S. If said ring blower is used, coarse powder can be returned more reliably.

<Operation>
Next, the operation of the pulverizing apparatus A according to the present invention will be described. A suction operation is performed by a blower connected to the product discharge port 4, and the rotor 8 is rotated at a high speed. As the rotor 8 rotates at a high speed, a negative pressure is generated, and the force to be pulled toward the motor 7 and the suction force by the blower 21 are in conflict with each other, but the suction force of the blower 21 is greater. Is set to

  Thereby, the input raw material is gradually pulverized by repeating the collision between the raw materials and the collision between the raw material and the inner wall surface 10 by the high-speed airflow. The raw material flows downstream through the gap between the rotor 8 and the inner wall surface 10 and between the rotor 8 and the rotor 8.

  Moreover, the uneven | corrugated | grooved part 10a was formed in the inner wall surface 10, and the fine powder with a smaller particle size was able to be obtained as mentioned above. Moreover, by providing the concavo-convex portion 10a, the surface area can be increased and the heat dissipation effect can be enhanced. For example, when the raw material is rice, the temperature of the frame constituting the classification space may rise to 90 ° C. at the maximum, but by providing the concavo-convex portion 10a, the temperature can only rise to 40-50 ° C. .

  Further, in the configuration without the concavo-convex portion 10a, when the rotational speed of the rotor 8 is increased to a certain value, the particle size of the recovered fine powder is not changed even when the rotor 8 is further increased, but the concavo-convex portion 10a is provided. Thus, it was possible to obtain a finer granularity by further increasing the rotational speed.

  Even in the classification space C on the downstream side of the rotor 8, a vortex is generated by the high-speed air current, and due to the centrifugal force generated by this vortex, the raw material that is not sufficiently pulverized is blown away in the direction of the inner wall surfaces 11, 12, 13. Only the crushed raw material is discharged from the central product outlet 4. The inner wall surface 12 and the inner wall surface 13 are stepped surfaces so that an insufficiently pulverized raw material is not accidentally discharged from the product discharge port 4. Thereby, only the raw material ground to the desired particle size is taken out as a product, and a uniform fine powder can be obtained.

<Action and effect>
According to the fine pulverizing apparatus A of the present invention, the temperature rise can be suppressed as much as possible because of the airflow type pulverization. Moreover, since there is no collision part between metals, a metal powder does not mix and it has a structure which is hard to produce a failure.

  The particle size can be adjusted by adjusting the number of rotations of the rotor 8 and the suction air volume of the blower 21 in addition to the interval setting of the rotor 8 described above, and the particle size can be adjusted by a very simple operation. Further, the rotor 8 can be formed in a thin disk shape having a thickness of several millimeters, the rotor 8 can be reduced in weight, and the power equipment for driving the rotor 8 can be reduced in size. Further, it is considered that the particle size can be adjusted by changing the shape or pitch of the concavo-convex portion 10a.

  The pulverizing apparatus A according to the present invention has a simple structure inside the raw material pulverizing chamber, can easily perform maintenance such as disassembly and cleaning, and can also suppress the cost of the apparatus itself. In addition, the overall size of the apparatus is compact, and a large installation location is not required.

  In the present invention, even a raw material containing a relatively large amount of oil such as soybean, which is airflow pulverization and mechanical pulverization is difficult, can be uniformly pulverized. In addition, since the charged raw material is pulverized instantaneously and discharged from the product discharge port 4, there is also an advantage that the raw material is hardly deteriorated such as a loss of flavor.

  Since the fine pulverizing apparatus A according to the present invention has a structure in which only fine powder having a desired particle size is discharged, single-micron size and sub-micron size pulverization is possible in one pass.

<Experimental result>
Next, the results of actual pulverization experiments will be described. FIG. 4 shows the rice powder pulverized by the fine pulverization apparatus having the uneven portions according to the present invention, and FIG. 5 shows the rice powder pulverized by the fine pulverization apparatus having no uneven portions. The horizontal axis shows the particle size after pulverization, the left vertical axis shows the relative particle amount (%), and the right vertical axis shows the inclusion ratio of each particle size.

  As shown in FIG. 4, according to the present invention, the average particle size was 16.17 μm, and the median type was 10.91 μm. As shown in FIG. 5, according to the conventional configuration not including the uneven portion, the average particle diameter was 24.39 μm and the median diameter was 17.42 μm.

  As can be seen from this result, it can be seen that the configuration of the present invention having the uneven portions can be pulverized to a fine powder having a finer particle size.

  FIG. 5 is a diagram in which PET (polyethylene terephthalate) is pulverized by a pulverizing apparatus having uneven portions according to the present invention. FIG. 6 is a diagram in which PET is pulverized by a pulverizing device having no uneven portions.

  As shown in FIG. 6, according to the present invention, the average particle size was 73.36 μm, and the median type was 57.35 μm. As shown in FIG. 7, according to the conventional configuration not including the uneven portion, the average particle diameter was 116.6 μm and the median diameter was 90.37 μm. In the case of a resin, heat is likely to be generated, and the effect of the present invention is remarkably exhibited.

  FIG. 8 is a photomicrograph of particles obtained from the experimental results shown in FIG. 6, and FIG. 9 is a photomicrograph of particles obtained from the experimental results shown in FIG. As can be seen from this photograph, it can be seen that pulverization by a pulverizing apparatus having uneven portions has a finer particle diameter, a smooth surface shape, and excellent quality.

<Sludge treatment>
The pulverizing apparatus according to the present invention can be applied to sludge treatment as will be described in detail below. Among industrial wastes, what is called sludge is a mixed waste of solids and moisture. Such sludge is comprised from the inorganic sludge which consists of inorganic substances etc., and the organic sludge derived from biochemical wastewater treatment. In addition, sewage discharged as a person lives is divided into general household wastewater and corporate wastewater, and is treated by various methods. Half of the sludge produced in the process is organic sludge that can be treated.

  Currently, the sludge is disposed of in landfills after dehydration. However, the free space in landfills is decreasing year by year, and volume reduction of excess sludge is required.

  About 90% of the sludge bacteria are composed of water and are covered with a strong cell membrane, so that it is difficult to break. Therefore, it is common to dry the surface and reclaim it or incinerate it in a furnace.

  In order to reduce the volume of excess sludge, volume reduction by bead mill and disk type grinding has been studied. However, pulverization of water-containing sludge has many difficult aspects, and is currently not in practical use. In other words, due to the nature of the cell membrane of sludge bacteria, it is difficult to pulverize by pressing, pressing, striking, and grinding.

  The fine pulverizing apparatus according to the present invention is an air flow pulverization technique using a normal jot mill (which generates an air flow in the pulverization chamber and causes the object to be pulverized to collide with the casing by high-speed vortex, or the pulverized objects collide with each other, or Not only the function of pulverizing by colliding, but also the function of creating a negative pressure state that opposes back and forth around the rotor that rotates at high speed and breaking the object to be crushed in the high-pressure airflow. is there. As a result, the sludge can be pulverized by the fine pulverization apparatus according to the present invention.

  In addition, about the temperature in a grinding | pulverization chamber, it is preferable to set to about 120 degreeC or more. As the structure of the heat source for heating, an appropriate one can be adopted. For example, it is possible to employ a configuration in which the raw material is supplied from the position of the hopper 2 and hot air at a predetermined temperature is sent into the grinding chamber. Further, other heaters may be provided in the grinding chamber.

  When actually experimenting with sludge, 1 kg of sludge could be reduced to 120 g.

<Another embodiment>
The raw material pulverized by the pulverizing apparatus according to the present invention is not particularly limited, but is particularly suitable for foods such as green tea, black tea, coffee beans, soybeans, red beans, rice, and laver. It can also be applied to crushing resins other than food.

  The number of rotors can be properly selected depending on the pulverized particle size and pulverized raw material, for example, from 1 to 10.

  In the present embodiment, two classification space portions are formed, but the set number can be determined as appropriate. The set number of connection parts for forming the bypass path P can also be changed according to this number.

A Fine grinding device B Raw material supply device C Classification space S1 Cylindrical space S2 Taper space portion S3 First classification space portion S4 Second classification space portion P Bypass route Q Internal route 1 Base 2 Hopper 3 Raw material grinding chamber 4 Product outlet 7 Motor 8 Rotor 8a Hole portion 8b Blade portions 10, 11, 12, 13 Inner wall surface 10a Uneven portion 15 First connection portion 16 Second setting portion 17 Tip connection portion

Claims (6)

A raw material supply port provided on one end side, a product discharge port provided on the other side, a raw material crushing chamber for crushing the raw material supplied from the raw material supply port and discharging it from the product discharge port, A rotor formed of at least one thin plate disposed on the upstream side, a cylindrical space in which the rotor is accommodated, and a cylinder that is disposed on the downstream side of the cylindrical space and has an inner diameter set smaller than the cylindrical space A classification space having a shape and the product discharge port disposed on the downstream side of the classification space, and the raw materials collide with each other or the raw material and the inner wall surface of the raw material crushing chamber by an air flow generated by the rotation of the rotor. In the fine grinding device
A fine pulverizing apparatus, wherein an inner wall surface of the cylindrical space is formed with a large number of irregularities along a circumferential direction.   The pulverizing apparatus according to claim 1, wherein the uneven portion is formed by lining.   The fine pulverization apparatus according to claim 1, wherein the concavo-convex part is formed so that the pitches of the concave part and the convex part are equal.   The pulverizing apparatus according to claim 1, wherein the concave portion is formed as a groove parallel to an axis of the rotor.   A plurality of the rotors are arranged side by side along the rotation axis direction, and the arrangement interval of the rotors is configured to be adjustable, thereby adjusting the granularity of the product. 5. The pulverizing apparatus according to any one of 4 above. A bypass path that is arranged outside the classification space and bypasses the front end side of the classification space from the upstream side of the classification space;
An internal path that is arranged inside the classification space and is connected to the upstream side of the classification space from the tip side of the classification space, and out of the crushed raw material, the coarse powder discharged to the bypass path side The pulverizing apparatus according to any one of claims 1 to 5, wherein the pulverizing apparatus is configured to return to the classification space again via a route.

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