JP4805473B2 - Fine grinding device and powder product manufacturing system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pulverizing apparatus used for manufacturing toner for electrophotography, powder coating, and the like, and a powder product manufacturing system using the same.
[0002]
[Prior art]
In a general toner manufacturing system, a plurality of raw materials are weighed in predetermined amounts and mixed by a mixer, and the resulting mixture is kneaded while being melted by a twin screw extruder or the like, and cooled by a cooling device. Solidify. Next, the solid is roughly pulverized to a size of about 1 mm with a hammer mill or the like, and further pulverized to 50 μm or less with a fine pulverizer. And after grind | pulverizing this pulverized material with a separator and removing the fine powder below a predetermined particle size, an external additive is added and sieved to obtain a product.
[0003]
8 is a cross-sectional view showing an example of a conventional pulverizing apparatus used in the pulverizing step, and FIG. 9 is a cross-sectional view taken along the line AA of FIG. In these drawings, reference numeral 101 denotes a casing, which includes a cylindrical main body 101a and a lid 101b attached to the upper surface thereof. A crushing chamber 120 is formed by the main body 101a and the lid body 101b. An air inlet 102 is provided in the lower part of the side surface of the main body 101a, and a raw material inlet 103 and an outlet 104 are provided in the lid 101b. Further, a hole 105 for attaching a rotating shaft is formed at the center of the lower surface of the main body 101a. The hole 105 has a first rotating shaft 107 and a second rotating shaft positioned inside the hole 105 through a bearing 106. 108 is attached coaxially.
[0004]
Pulleys 109 and 110 are attached to lower ends of the first rotating shaft 107 and the second rotating shaft 108, respectively, and these are connected to a motor (not shown) via a belt (not shown). A crushing rotor 111 is attached to the upper part of the first rotating shaft 107, and a classification rotor 112 is attached to the upper end of the second rotating shaft 108. The grinding rotor 111 is composed of a disk 113 and a large number of rib-like plates 114 attached along the peripheral edge of the upper surface thereof. A ring-shaped hammer 115 is integrally formed on the plate 114, and a large number of concave and convex crushing blades 116 are formed on the entire outer periphery thereof. A liner 117 is fixed to the inner peripheral surface of the casing 101 so as to face the outer peripheral surface of the hammer 115, and a large number of concave and convex crushing blades 118 are formed on the inner peripheral surface of the liner 117 over the entire periphery. ing.
[0005]
The raw material input from the raw material input port 103 is pulverized between the rotating hammer 115 and the liner 117, rises with the air flowing in from the air inlet 102, and is discharged to the outside by the classification rotor 112 through the outlet 104. Then, the particle size is classified into those falling on the disk 113 through the inside of the hammer 115. The latter flows between the hammer 115 and the liner 117 through a circulation passage 119 formed between the plates 114 and is pulverized again. What is discharged from the outlet 104 is classified by another classifier (not shown), and a product having a predetermined particle size or more becomes a product, and a product having a particle size less than the predetermined particle is collected by a dust collector.
[0006]
[Problems to be solved by the invention]
In the conventional pulverizing apparatus as described above, a part of the raw material that is not discharged from the outlet 104 swirls along the inner peripheral surface of the pulverizing chamber 120 to form a swirling flow. The amount of the swirling flow increases as time passes, and falls on the grinding rotor 111 at a stroke due to some factor (for example, air pressure supplied from the outside via the outlet 104). As a result, there is a problem that a great load is applied to the grinding rotor 111 and pulsation occurs.
[0007]
In addition, the fine pulverization apparatus that pulverizes the raw material between the hammer and the liner as described above does not use a compressor unlike the airflow type pulverization apparatus, and has the advantage of less power consumption. The sphericity of the toner tends to be higher than that of the apparatus. Many current electrophotographic image forming apparatuses (such as copiers and laser printers) are designed according to the shape of toner manufactured using an airflow pulverizer, and the above-described pulverizer is used. There was a problem that the manufactured toner was difficult to fit.
[0008]
The present invention has been made in view of the above-described problems, and an object of the present invention is to use a pulverizing apparatus and a pulverizing apparatus which can prevent a great load from being applied to the pulverizing rotor and can be driven stably. It is to provide a powder product manufacturing system.
[0009]
Another object of the present invention is to provide a powder product manufacturing system that can manufacture a powder product that consumes less power and is compatible with current electrophotographic image forming apparatuses.
[0010]
[Means for Solving the Problems]
In order to achieve the above-mentioned purpose, Book The invention pulverizes the raw material by the crushing rotor, the crushing rotor that is rotatably provided inside the crushing chamber, and the crushing rotor that is fixedly disposed with a gap between the outer periphery of the crushing rotor. A classification rotor that is disposed above the pulverization rotor and that discharges raw materials pulverized by the pulverization rotor and the liner and having a predetermined particle size or less to the outside of the pulverization chamber; and the classification rotor A pulverizing apparatus including a circulation passage for bringing the raw material not discharged by the lower part of the gap, swirl prevention means for preventing the raw material not discharged by the classification rotor from swirling along the inner surface of the pulverizing chamber. Provided above the grinding rotor The swirl prevention means is flat and is attached so as to protrude vertically and inward of the crushing chamber in a state straddling the inner peripheral surface and the upper surface of the crushing chamber. , Above the lower end of the classification rotor It is characterized by this.
[0012]
Also ,in front Record Rotation prevention means Is characterized by being detachable from the grinding chamber.
[0013]
Also ,in front Record Times prevention means Is detachable at a plurality of locations in the crushing chamber.
[0014]
Also ,in front An uneven pulverizing blade is formed on the outer peripheral portion of the pulverizing rotor by engraving a large number of linear grooves extending in the vertical direction at a predetermined pitch, and is provided on a surface of the liner facing the pulverizing rotor. An uneven crushing blade is formed by forming a large number of linear grooves extending in the vertical direction at a predetermined pitch.
[0015]
Also ,in front An uneven pulverizing blade formed by engraving a large number of linear grooves at a predetermined pitch is formed on the outer peripheral portion of the pulverizing rotor, and the large number of grooves are formed by the rotation of the pulverizing rotor. It is characterized in that it is inclined at a predetermined angle with respect to the rotation direction of the grinding rotor so as to guide the steel upward.
[0016]
Also ,in front An uneven crushing blade is formed on a surface of the liner facing the crushing rotor by engraving a large number of linear grooves at a predetermined pitch, and the plurality of grooves are rotated by the crushing rotor. Accordingly, the material is inclined at a predetermined angle with respect to the rotation direction of the grinding rotor so as to guide the raw material upward.
[0017]
Also ,in front A cooling means for cooling the grinding chamber is provided.
[0018]
Further, the cooling means is arranged so as to surround the pulverization chamber and is formed so as to circulate a cooling medium therein.
[0019]
Also ,in front The cooling means is configured to be able to adjust the cooling temperature.
[0020]
Also , Place A powder product manufacturing system that is distributed within a predetermined particle size range and melted by heating, kneading means for kneading while melting the raw material, and cooling means for cooling and solidifying the kneaded product obtained by the kneading means, A first pulverizing means for coarsely pulverizing the solid material obtained by the cooling means, a second pulverizing means for finely pulverizing the pulverized material obtained by the first pulverizing means, and the second pulverizing means. And classifying means for removing fine powder having a particle size less than a predetermined particle size by classifying the pulverized product obtained in step (b), wherein the second pulverizing means comprises: the above It comprises the pulverization apparatus described in any of the above.
[0021]
Also ,in front The second pulverizing means includes an airflow pulverizer that pulverizes the pulverized product obtained by the fine pulverizer, and after the raw material is pulverized to near the product particle size by the fine pulverizer, the airflow pulverizer It is characterized by being pulverized to product particle size.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of a pulverizing apparatus according to an embodiment of the present invention, and FIG. 2 is a perspective view of a part of a liner of the pulverizing apparatus of FIG. The fine pulverizing apparatus of this embodiment is used by being incorporated in a toner manufacturing system.
[0023]
In FIG. 1, reference numeral 1 denotes a casing, which is formed in a two-stage cylindrical shape, and includes a large-diameter portion 1a and a small-diameter portion 1b that is coaxially attached to the upper surface thereof. The inside of the large diameter portion 1a is a crushing chamber 2, and the inside of the small diameter portion 1b is a classification chamber 3. A cylindrical air inlet 4 is provided in the lower part of the side surface of the large-diameter part 1a, and a raw material inlet 5 is provided in the upper part of the side surface. Moreover, the cylindrical exit 6 which protruded to the side is provided in the side surface upper part of the small diameter part 1b. Further, a hole 7 is formed at the center of the lower surface of the large diameter portion 1 a, and a rotating shaft 9 is attached to the hole 7 via a bearing 8.
[0024]
A pulley 10 is attached to the lower end of the rotary shaft 9, and the pulley 10 is connected to a motor (not shown) via a belt (not shown). A crushing rotor 11 is attached to the upper part of the rotating shaft 9. The crushing rotor 11 includes a disk 12 and a large number of rib-like plates 13 attached along the peripheral edge of the upper surface thereof. A ring-shaped hammer 14 is integrally formed on the plate 13, and an uneven crushing blade 14 a is formed on the entire outer periphery thereof. The crushing blade 14a is formed by a large number of linear grooves that are cut at a predetermined pitch and extend in the vertical direction.
[0025]
A liner 16 is fixed to the inner peripheral surface of the crushing chamber 3 so as to face the outer peripheral surface of the hammer 14, and an uneven crushing blade 16a is formed on the inner peripheral surface of the liner 16 over the entire periphery. . As shown in FIG. 2, the pulverizing blade 16a is formed by a large number of linear grooves engraved at a predetermined pitch, and these grooves are in the rotational direction (arrow direction) of the pulverizing rotor 11. It is inclined at a predetermined angle. Accordingly, since the raw material is guided upward along the groove of the pulverizing blade 16a as the pulverizing rotor 11 rotates, the time during which the raw material stays between the liner 16 and the hammer 14 can be shortened, and the raw material is melted. Can be prevented. In addition, the groove | channel which comprises the crushing blade 16a may be formed so that it may extend in a perpendicular direction, and the groove | channel which comprises the crushing blade 14a may be made to incline as mentioned above. Further, the grooves of the crushing blades 14a and 16a may be inclined, and may be formed so as to extend in the vertical direction.
[0026]
A hole 17 is formed at the center of the upper surface of the small diameter portion 1 b, and a rotating shaft 19 is attached to the hole 17 via a bearing 18. A pulley 20 is attached to the upper end of the rotating shaft 19, and the pulley 20 is connected to a motor (not shown) via a belt (not shown). A classification rotor 21 is attached to the lower end of the rotating shaft 19. The classifying rotor 21 includes a disc-shaped bottom wall 23 having a shaft portion 22 extending upward at the center, and a ring-shaped top wall 24 disposed at an interval above the bottom wall 23. , Which are arranged around the shaft portion 22 at a predetermined angular interval, and are composed of a plurality of blades 25 connecting the peripheral portions of the bottom wall 23 and the top wall 24.
[0027]
A vane 26 is provided above the inside of the crushing chamber 2. The vane 26 has a flat plate shape, and is attached so as to project vertically and inward toward the inside of the crushing chamber 2 while straddling between the inner peripheral surface and the upper surface of the crushing chamber 2. There may be one or a plurality of vanes 26. In the case of a plurality of vanes 26, it is preferable to provide them at a constant angular interval in the inner peripheral direction of the crushing chamber 2.
[0028]
Around the pulverization chamber 2, jackets 27 and 28 for cooling the pulverization chamber 2 are provided. A refrigerant is circulated and supplied into the jacket 27 from a tank (not shown) provided separately. That is, the refrigerant flowing from the inlets 27a and 28a provided at the upper part exchanges heat with the air inside the crushing chamber 2, and flows out from the outlets 27b and 28b provided at the lower part. The jackets 27 and 28 and the shape of the grinding blade 16a described above prevent the raw material from melting.
[0029]
The raw material charged together with the cold air from the raw material charging port 5 is crushed between the rotating hammer 14 and the liner 16, rises with the air flowing in from the air inlet 4, and is discharged to the outside by the classification rotor 21 through the outlet 6. And those that fall on the disk 12 through the inside of the hammer 14. The latter flows between the hammer 14 and the liner 16 through a circulation passage 29 formed between the plates 13 and is reground. What is discharged from the outlet 6 is classified by another classifier, and products having a predetermined particle size or more become products, and those having a particle size less than the predetermined particle size are collected by a dust collector.
[0030]
A part of the raw material that is not discharged from the outlet 6 is given centrifugal force by the classification rotor 21 and tries to flow in the circumferential direction along the inner peripheral surface of the crushing chamber 2, but it collides with the vane 26 and falls. Therefore, a swirling flow of the raw material is not formed along the inner peripheral surface of the crushing chamber 2. Therefore, a large amount of raw material does not fall on the grinding rotor 11 at a stretch, and the pulsation of the grinding rotor 11 can be prevented, so that the grinding rotor 11 can be driven stably.
[0031]
The average particle size of the pulverized material discharged by the classification rotor 21 varies depending on the presence or absence of the vane 26. When the vane 26 is present, the average particle size of the pulverized material discharged by the classification rotor 21 is larger. This is considered to be because if the vane 26 is present, the pulverization rotor 11 can be driven stably, so that the number of pulverization processes added to the raw material can be reduced and fine powder is hardly generated.
[0032]
Further, as the pitch of the grooves forming the grinding blades 14a and 16a is reduced, the processing capacity per unit input energy of the fine grinding device is improved. In addition, since the grinding | pulverization blades 14a and 16a become easy to wear out so that a pitch becomes small, it is preferable that a pitch is about 0.5-10 mm.
[0033]
Further, as the gap between the grinding rotor 11 and the liner 16 becomes smaller, the processing capacity per unit input energy of the fine grinding device is improved. In addition, since the grinding | pulverization blades 14a and 16a become easy to wear out so that a clearance gap becomes small, it is preferable that a clearance gap is about 0.1-2.0 mm.
[0034]
Further, as the peripheral speed of the grinding rotor 11 is increased, the processing capacity per unit input energy of the fine grinding device is improved. As the peripheral speed of the crushing rotor 11 increases, the crushing blades 14a and 16a are more easily worn and the iron content in the pulverized product increases. Therefore, the peripheral speed of the crushing rotor 11 is 150 m / sec or more and 200 m / sec. Preferably it does not exceed sec.
[0035]
Further, as the temperature of the cold air introduced into the pulverizing chamber 2 together with the raw material becomes lower, the processing capacity of the pulverizing apparatus is improved. This is because the lower the temperature of the cold air, the more the raw material becomes brittle and more easily cracked. Moreover, the amount of fine powder generated decreases as the temperature of the cold air decreases. This is considered to be because the raw material is easily cracked, so that the number of pulverization treatments added to the raw material is reduced, and fine powder is hardly generated.
[0036]
When comparing the processing capacity of the system using the pulverizing apparatus of the present invention and the system using the conventional airflow pulverizing apparatus as shown in FIG. 3, the system using the pulverizing apparatus of the present invention is better. It has been found that the difference increases as the processing capacity is more than twice as high and the average particle size of the pulverized product increases.
[0037]
In the airflow type pulverization apparatus shown in FIG. 3, the raw material supplied into the pulverization chamber 202 via the raw material supply pipe 201 is ejected from a plurality of nozzles 203 attached to the side surface of the machine body toward one point in the machine. The crushed raw material is accelerated by the jet stream, and is pulverized by the collision between the particles. The crushed raw material rides on the rising air stream, and the classifying rotor 204 discharges the powder having a predetermined particle size or less through the discharge pipe 205. Yes. In addition, the powder exceeding a predetermined particle size descends and is pulverized again. Examples of such an airflow type pulverizer include a counter jet mill (trade name) manufactured by Hosokawa Micron Corporation.
[0038]
In addition, when the airflow pulverizer and the fine pulverizer of the present invention were compared in terms of the amount of fine powder generated (% by weight relative to the raw material) and product yield (% by weight of the product relative to the raw material), However, the amount of fine powder generated was smaller and the product yield was better.
[0039]
In addition, the classifier combined with the pulverizing apparatus of the present invention is not particularly limited, but for example, a classifier as shown in FIGS. 4 and 5 can be used. In the example shown in FIG. 4, the air supplied into the classification air chamber 616 through the classification air supply pipe 619 is ejected into the classification space 612 through the gap formed in the guide blade ring 605, and the classification blade ring 608. Then, the air flows into the rotating classification rotor 602 through the gap formed in the above. On the other hand, the powder introduced through the inlet 615 is dispersed in the entire circumferential direction by the distribution disk 606 of the classification rotor 602 and flows into the classification space 612. While the powder that has flowed into the classification space 612 falls in the classification space 612, the powder having a particle size less than a predetermined size rides on the classification air flow and flows into the classification rotor 602, and turns downward in the axial direction together with the classification air flow. Then, the air flows into the classification rotor support member 604 through the through hole 610 formed in the cover disk 607 and flows into the discharge chamber 617 through the gap formed in the interval web 625. Then, the powder is discharged to the outside through the discharge pipe 620. On the other hand, the powder having a predetermined particle size or more does not get on the classification air flow in the classification space 612, falls in the classification space 612 by gravity, and is received by the discharge chamber 618. Then, this powder is discharged to the outside through the discharge pipe 621.
[0040]
Reference numeral 601 denotes a casing, reference numeral 603 denotes a drive shaft that rotates the classification rotor 602 via the classification rotor support member 604, and reference numeral 627 denotes a spiral spiral member for controlling the residence time and aggregation of the classified objects in the classification space 612. , 628 is a member for rotating with the classifying rotor 602 to fluidize the powder in the discharge chamber 618, 629 is an air passage for introducing cleaning air into the gap between the casing 601 and the classifying rotor 602, This is a pressing ring for preventing the powder inside the discharge chamber 618 from flowing back into the classification space 612. An example of such a classifier is a TSP separator (trade name) manufactured by Hosokawa Micron Corporation.
[0041]
In the case shown in FIG. 5, the powder and primary air are supplied into the machine via the raw material supply pipe 501 and the powder is stirred and dispersed in the fluid chamber 502 to loosen the aggregates and become a single particle. . Then, the powder rides in the ascending air current and flows into the classification chamber 503, and the classification rotor 504 classifies and sorts only the powder having a particle size less than a predetermined particle size, and the powder is discharged out of the apparatus via the discharge pipe 505. On the other hand, powder having a predetermined particle size or more descends along the wall surface and is stored in the lower part of the machine, and is discharged outside the machine through the rotary valve 506. Reference numeral 507 denotes a secondary air supply pipe, and reference numeral 508 denotes a motor that rotates the classification rotor 504. An example of such a classifier is Turboplex (trade name) manufactured by Hosokawa Micron Corporation.
[0042]
In addition to these classifiers, for example, a dispersion separator (trade name) manufactured by Nippon Pneumatic Industrial Co., Ltd., an elbow jet (trade name) manufactured by Nittetsu Mining Co., Ltd., and a turbo classy manufactured by Nisshin Engineering Co., Ltd. A fire (trade name) or the like can also be used. Moreover, you may use another classifier.
[0043]
By the way, as described in the section of the prior art, the sphericity of the powder obtained by the fine pulverization apparatus in which the raw material is pulverized between the rotating hammer and the liner is the sphericity of the powder obtained by the airflow type pulverization apparatus. If the difference is larger than this, the current electrophotographic image forming apparatus may not be suitable. As a method for reducing the sphericity of the powder, it is possible to shorten the time during which the raw material stays in the pulverizer. That is, since the raw material of the toner is a thermosetting resin, when the residence time is long, the toner melts and rounds the corners, thereby increasing the sphericity.
[0044]
In order to shorten the residence time of the powder, it is only necessary to improve the pulverization efficiency and increase the amount of powder discharged to the outside by one pulverization process. By providing the vane 26 as in the present invention, the pulverization rotor 11 can be driven stably, so that the pulverization efficiency is improved and the residence time of the powder can be shortened. The sphericity of the powder can be controlled by leaving the vane 26 detachable from the crushing chamber 2 and removing the vane 26 or replacing it with another vane having a different shape or size. Note that the sphericity of the powder can be controlled more finely by making the vanes detachable at a plurality of locations in the crushing chamber 2.
[0045]
Further, if the temperature of the raw material is lowered, the raw material becomes brittle, so that the fracture surface during pulverization becomes rough and the sphericity becomes small. Since the inside of the crushing chamber 2 is cooled by providing the cooling jackets 27 and 28 as in this embodiment, the temperature of the raw material can be lowered. In addition, since the temperature in the crushing chamber 2 can be adjusted by making it possible to adjust the amount and temperature of the refrigerant supplied to the cooling jackets 27 and 28, the sphericity of the powder can be controlled. . The average sphericity of the powder obtained by the above-described airflow pulverizer is 0.93, whereas the average sphericity of the powder obtained by the fine pulverizer of this embodiment is 0.95. Yes.
[0046]
As a method of further reducing the sphericity of the powder with the fine pulverizing apparatus of the present invention, the pitch of the grooves forming the pulverizing blade 14a and the pulverizing blade 16a, which reduces the size of the gap between the hammer 14 and the liner 16, is used. For example, the height of the crushing rotor 11 is increased (the height of the crushing space is increased).
[0047]
Further, as a method for more reliably reducing the sphericity of the powder, it is conceivable to use a combination of the fine pulverizer of the present invention and the airflow pulverizer. That is, the raw material is pulverized to near the product particle size by the fine pulverizer of the present invention, and the pulverized product is pulverized to the product particle size by the airflow pulverizer. In this case, it is possible to reduce the burden on the airflow type pulverizer by reducing the particle size of the powder obtained by the fine pulverizer of the present invention as close as possible to the product particle size, and the power consumption can be reduced. If the raw material is too finely pulverized by the fine pulverizing apparatus of the invention, it becomes difficult to obtain a desired sphericity. As a result of experiments, it has been found that preferable results can be obtained by crushing to about 1.5 times the product particle size with the fine crushing apparatus of the present invention.
[0048]
In order to significantly improve the processing capacity of the raw material with a fine pulverizing apparatus combining a pulverizing means and a classification rotor for pulverizing the raw material between a hammer and a liner as in the present invention, the apparatus must be enlarged. However, in this case, if the classification rotor is simply enlarged and its peripheral speed is the same, the centrifugal force acting on the particles will be reduced, so the classification accuracy will be reduced, and the fine powder contained in the discharged powder will be reduced. There is a problem that the ratio increases. Therefore, if a plurality of classification rotors are provided, a large amount of raw materials can be processed without lowering the classification accuracy.
[0049]
FIG. 6 is a cross-sectional view showing an example of such a pulverizing apparatus, and FIG. 7 is an enlarged view of a main part of FIG. In addition, the same code | symbol is attached | subjected to the part corresponding to the pulverization apparatus of FIG. 1, and the overlapping description is abbreviate | omitted. As shown in FIG. 6, in this apparatus, a powder discharge pipe 30 extending in the vertical direction is provided above the grinding rotor 11, and four tubular suction ports 31 are provided on the outer peripheral surface of the lower end portion thereof. It is provided at an angular interval of 90 ° in the direction. Each suction port 31 protrudes in the horizontal direction.
[0050]
A classifying rotor 21 is provided so as to face the front end surface of each suction port 31, and the outer surface of the ring-shaped top wall 24 of each classifying rotor 21 is the front end portion 31 a (see FIG. 7). An air seal forming tube 32 is coaxially provided on the outer peripheral surface of the powder discharge tube 30. A plurality of air inlets 32 a are provided at the upper end of the air seal forming pipe 32, and each air inlet 32 a is connected to a compressor (not shown) through a compressed air supply pipe 33.
[0051]
Further, four tubular air outlets 32b are provided at the lower end portion of the air seal forming pipe 32 at an angular interval of 90 ° in the circumferential direction. Each air outlet 32 b protrudes in the horizontal direction and is positioned coaxially with the suction hole 31 outside the suction hole 31. The front end portion 32c (see FIG. 7) of each air outlet 32b faces the outer surface of the top wall 24, and the width of the gap G formed between the front end portion 32c and the top wall 24 is the front end portion of the suction hole 31. It is larger than the width of the gap G ′ formed between 31 a and the top wall 24. Reference numeral 34 denotes a motor, and a pulley 35 is attached to the rotating shaft thereof. The pulley 35 is connected to a pulley 20 attached to the rear end portion of the rotating shaft 19 of the classifying rotor 21 via a belt 36. .
[0052]
In this fine pulverizing apparatus, the raw material crushed between the hammer 14 and the liner 16 and brought to the upper side of the pulverizing chamber 2 is classified by the four classifying rotors 21, and those having a predetermined particle size or less pass through the suction ports 31. The powder flows into the powder discharge pipe 30 and is discharged to the outside through the opening 30 a at the upper end of the powder discharge pipe 30. Note that compressed air is supplied to the inside of the air seal forming pipe 32 via each compressed air supply pipe 33, and this compressed air flows out of the air seal forming pipe 32 via the gap G. The raw material or the like does not flow into the air seal forming tube 32. This prevents the raw material that does not pass through the classification rotor 21 from flowing into the suction hole 31.
[0053]
In this way, by providing a plurality of classification rotors, the classification accuracy does not decrease even if the apparatus is enlarged, so the proportion of fine powder contained in the discharged powder does not increase. In this apparatus, no vane is provided in the pulverization chamber. However, the same effect can be obtained with a fine pulverization apparatus in which the vane is provided in the pulverization chamber as in the present invention.
[0054]
The present invention can also be applied to powder products other than toner (for example, powder paint).
In addition, various modifications can be made to the above-described embodiment without departing from the scope of the present invention.
[0055]
【The invention's effect】
As described above, the fine pulverization apparatus of the present invention is provided with the swirl prevention means for preventing the raw material not discharged by the classification rotor from swirling along the inner surface of the pulverization chamber. Therefore, it is possible to prevent a large amount of raw material from dropping and applying a great load to the grinding rotor, so that the grinding rotor can be driven stably.
[0056]
According to the pulverizing apparatus of the third aspect, the quality of the pulverized product can be controlled by removing the member that prevents the rotation of the raw material from the pulverizing chamber or replacing it with another member.
[0057]
Further, according to the fine pulverizing apparatus of the fourth aspect, the quality of the pulverized product can be controlled more finely by making the member for preventing the rotation of the raw material detachable at a plurality of locations in the pulverizing chamber.
[0058]
Further, according to the pulverizing apparatus of claims 6 and 7, since the time during which the raw material stays between the pulverizing rotor and the liner can be shortened, the raw material becomes difficult to melt and a product of desired quality can be obtained. It becomes easy.
[0059]
According to the fine pulverizing apparatus of the eighth aspect, since the cooling means for cooling the pulverizing chamber is provided, the raw material becomes difficult to be melted and easily pulverized, so that a product having a desired quality can be easily obtained.
[0060]
According to the pulverizing apparatus of the tenth aspect, the quality of the pulverized product can be controlled by configuring the cooling means to be able to adjust the cooling temperature.
[0061]
In addition, according to the powder product manufacturing system of the twelfth aspect, a powder product having a small sphericity can be efficiently manufactured.
[Brief description of the drawings]
FIG. 1 is a sectional view of a pulverizing apparatus according to an embodiment of the present invention.
FIG. 2 is a perspective view of a part of the liner of the pulverizing apparatus of FIG.
FIG. 3 is a cross-sectional view showing an example of an airflow type pulverizer.
FIG. 4 is a cross-sectional view showing an example of a classifier combined with the pulverizing apparatus of the present invention.
FIG. 5 is a cross-sectional view showing an example of a classifier combined with the pulverizing apparatus of the present invention.
FIG. 6 is a cross-sectional view showing an example of a pulverizing apparatus including a plurality of classification rotors.
FIG. 7 is an enlarged view of a main part of FIG.
FIG. 8 is a cross-sectional view showing an example of a conventional pulverizing apparatus.
9 is a cross-sectional view taken along line AA in FIG.
[Explanation of symbols]
2 Crushing chamber
11 Grinding rotor
16 liner
21 classification rotor
26 Vane (turning prevention means)
29 Circulation passage

Claims (11)

A grinding chamber;
A crushing rotor provided rotatably in the crushing chamber;
A liner that is fixedly disposed with a gap between the outer periphery of the crushing rotor and crushes the raw material with the crushing rotor;
A classification rotor disposed above the crushing rotor and discharging the raw material crushed by the crushing rotor and the liner and having a predetermined particle size or less out of the crushing chamber;
In a pulverizing apparatus comprising a circulation passage for bringing the raw material not discharged by the classification rotor below the gap,
A swirl prevention means is provided above the crushing rotor for preventing the raw material not discharged by the classification rotor from swirling along the inner surface of the crushing chamber ,
The swirl prevention means is a flat plate, and is attached so as to protrude vertically and inward of the crushing chamber in a state straddling the inner peripheral surface and the upper surface of the crushing chamber,
The fine pulverizing apparatus , wherein a lower end of the swirl prevention means is above a lower end of the classification rotor . 2. The fine pulverization apparatus according to claim 1 , wherein the swirl prevention means is detachable from the pulverization chamber. 2. The fine pulverizing apparatus according to claim 1 , wherein the swirl prevention means is detachable at a plurality of locations in the pulverization chamber. An uneven crushing blade is formed on the outer peripheral portion of the crushing rotor by engraving a large number of linear grooves extending in the vertical direction at a predetermined pitch, and the liner is opposed to the crushing rotor. , according to any one of claims 1 to 3, characterized in that uneven grinding blade formed by engraving a number of straight grooves extending in the vertical direction at a predetermined pitch is formed fine Crushing equipment. A concavo-convex pulverizing blade is formed on the outer peripheral portion of the pulverizing rotor by engraving a large number of linear grooves at a predetermined pitch. pulverizing apparatus according to any one of claims 1 to 3, characterized in that it is inclined at a predetermined angle with respect to the rotational direction of the grinding rotor to direct upwardly. On the surface of the liner facing the pulverizing rotor, a concavo-convex pulverizing blade is formed by engraving a large number of linear grooves at a predetermined pitch. pulverizing apparatus according to any one of claims 1 to 3, characterized in that it is inclined at a predetermined angle with respect to the rotational direction of the grinding rotor to direct material upward along with. Pulverizing apparatus according to any one of claims 1 to 6, characterized in that a cooling means for cooling the grinding chamber. The fine pulverization apparatus according to claim 7 , wherein the cooling means is disposed so as to surround the pulverization chamber and is formed so as to circulate a cooling medium therein. The pulverizing apparatus according to claim 7 or 8 , wherein the cooling means is configured to adjust a cooling temperature. A powder product manufacturing system distributed within a predetermined particle size range and melted by heating, kneading means for kneading while melting the raw material, and cooling means for cooling and solidifying the kneaded product obtained by the kneading means, A first pulverizing means for coarsely pulverizing the solid material obtained by the cooling means, a second pulverizing means for finely pulverizing the pulverized material obtained by the first pulverizing means, and the second pulverizing means. And a classifying means for removing fine powder having a particle size of less than a predetermined particle size by classifying the pulverized product obtained in (1) above, wherein the second pulverizing means is the fine pulverizing apparatus according to any one of claims 1 to 9. A powder product manufacturing system characterized by comprising: The second pulverizing means includes an airflow pulverizer that pulverizes the pulverized product obtained by the fine pulverizer, and after the raw material is pulverized to near the product particle size by the fine pulverizer, the airflow pulverizer The powder product manufacturing system according to claim 10 , wherein the powder product is pulverized to a product particle size.

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