JP2004069115A - Grinding rotor and flash drying apparatus using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flash drying apparatus for preventing performance deterioration due to the adhesion of a raw material. <P>SOLUTION: The grinding rotor comprises: a vertical cylindrical enclosure 5; the grinding rotor 12 that has a plurality of blades 31 being radially erected on a disk 32, is rotated in the enclosure 5 to generate a turning air current, and crushes the raw material to generate particles; a raw material supply section 9 for dropping and supplying raw materials to the grinding rotor 12; a hot air supply section 24 for supplying hot air from the lower portion to the particles; and an exhaust section 7 for discharging the particles that are dried by the hot air from the upper portion of the enclosure 5. A projection 35 is formed on the peripheral surface of a blade 31 that opposes the inner wall of the enclosure 5. Blades 31s, 31t where positions in the axial direction of the projection 35 differ each other are provided. The blade 31s having the projection 35 at a lower portion is symmetrically arranged to a rotary axis. The blade 31t having the projection 35 at an upper portion is symmetrically arranged to the rotary axis. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pulverizing rotor that generates a swirling airflow by rotation and pulverizes raw materials to generate particles. The present invention also relates to an air-flow drying device that dries and discharges the granular material generated by the grinding rotor.
[0002]
[Prior art]
A conventional airflow drying apparatus is configured as shown in FIG. The airflow drying apparatus includes a housing 5 in which a plurality of cylindrical members are connected. An inflow port 1 for taking hot air supplied from a hot air generation source (not shown) into the housing 5 is provided at the lower part of the housing 5. Above the inflow port 1, a crushing rotor 12 that is rotationally driven by a drive motor 10 via a belt 14 is provided.
[0003]
The crushing rotor 12 has a plurality of blades 4 that are radially arranged facing the inner wall of the housing 5, and a crushing unit 3 that crushes the raw material into powder particles by the rotation of the blades 4 is formed. Above the pulverization unit 3, a raw material supply unit 9 that supplies raw materials is provided. The raw material supply unit 9 is provided with a screw feeder (not shown), and the raw material stored in a hopper (not shown) or the like is sent from the discharge port 9a and dropped to the crushing unit 3.
[0004]
A classifying unit 6 for classifying powder particles is provided on the top of the housing 5. The classifying unit 6 is configured such that a classifying blade 13 composed of a plurality of thin plates is provided in a radial manner and is rotated by a drive motor 8. As shown in FIG. 9, the classification blade 13 is disposed so as to be inclined by a predetermined angle α with respect to the center line 6a.
[0005]
Thereby, the rotational speed of the classification blade 13 is suppressed, and the penetration of the granular material into the classification unit 6 is restricted. The exhaust duct 7 provided above the classifying unit 6 is sucked by a blower (not shown) so that the granular material is discharged together with air and water vapor.
[0006]
In the airflow drying apparatus having the above-described configuration, the raw material containing moisture is dropped and supplied from the raw material supply unit 9 onto the crushing rotor 12 that is rotated by driving of the drive motor 10. The bulk material is pulverized into powder by collision with the blade 4. The granular material is blown up from below the blade 4 by hot air flowing into the housing 5 from the inlet 1 and further dispersed and dried while ascending inside the housing 5.
[0007]
Further, the classification blade 13 that is rotated by the drive of the drive motor 8 generates a swirling airflow. Centrifugal force due to the swirling airflow acts on the granular material that has moved up inside the housing 5 and has reached the vicinity of the classification unit 6. A centripetal force sucked by the classifying unit 6 acts on the granular material that has been reduced in weight by discharging air and water vapor. The granular material that is not sufficiently dispersed has a greater centrifugal force, and is blown to the outside of the classifying unit 6, dropped, sent to the pulverizing unit 3, and further exposed to hot air.
[0008]
The powder that has been dispersed and dried again has a greater centripetal force, and enters the classification unit 6 through the gap 6 b between the classification blades 13. And the dry granular material of the uniform magnitude | size discharged | emitted from the exhaust port 7a of the exhaust duct 7 is obtained.
[0009]
[Problems to be solved by the invention]
However, according to the above-described conventional airflow drying apparatus, the raw material contains moisture, so that the granular material easily adheres to the inner wall of the housing 5. For this reason, there existed a problem that the pressure loss of the hot air which the adhered granular material grew and passed through a grinding | pulverization part became large, and the inside of the housing | casing 5 was obstruct | occluded and the airflow drying apparatus could not be used.
[0010]
Although the deposits can be removed by narrowing the distance between the blade 4 and the housing 5, the powder particles are scraped off simultaneously by the entire blade 4, so that the load fluctuation of the drive motor 10 increases. For this reason, it is necessary to use the drive motor 10 having a large maximum output, which increases the cost of the airflow drying device.
[0011]
An object of this invention is to provide the grinding | pulverization rotor and airflow drying apparatus which can prevent the performance degradation by adhesion of a raw material at low cost.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, a grinding rotor according to the present invention comprises a rotatable plate-like member and a plurality of blades erected radially on the plate-like member, and generates a swirling airflow by rotation and the blade. In the crushing rotor for crushing the raw material supplied to the blade, a protrusion is formed on the peripheral surface of the blade, and the blade is provided with the blades having different positions in the axial direction, and the position of the protrusion in the axial direction is The same blade is arranged symmetrically with respect to the rotation axis.
[0013]
According to this configuration, the raw material supplied onto the crushing rotor arranged in the cylindrical casing is pulverized into powder particles by the blades made of thin plates, and is swirled in the casing by the swirling airflow to be dried. Protrusions that oppose the inner wall of the housing are formed on the peripheral surface of the blade. For example, two blades having protrusions on the top are arranged at positions symmetrical to the rotation axis, and protrusions on the bottom Are arranged at positions symmetrical with respect to the rotation axis. The granular material adhering between the peripheral surface of the blade and the inner wall of the housing is removed by the protrusion.
[0014]
Further, in the grinding rotor having the above-described configuration, the protrusion is provided only on a part of the blades, and the outer periphery of the blade that does not have the protrusions is located on the inner peripheral side of the outer periphery of the protrusion. It is a feature. According to this configuration, the gap between the blade having no protrusion and the inner wall of the housing is increased.
[0015]
According to the present invention, in the grinding rotor configured as described above, the length in the axial direction of the protrusion provided on the upper portion of the blade is shorter than the protrusion provided on the lower portion of the blade. According to this configuration, when removing the granular material adhering to the inner wall of the housing, the force applied to the protrusion formed on the upper portion of the blade is smaller than the force applied to the protrusion formed on the lower portion.
[0016]
According to the present invention, in the grinding rotor having the above-described configuration, the plate-shaped member has a first groove formed radially and a second groove formed annularly, and the blade extends in the radial direction on the bottom surface side. An extension member and a groove portion provided on the upper surface side of the extension portion are provided, and an annular member is fitted into the second groove together with the groove portion of the blade fitted into the first groove to hold the blade. It is characterized by that.
[0017]
The airflow drying apparatus of the present invention has a vertical cylindrical housing and a plurality of blades erected on a plate-like member in a radial manner, and rotates in the housing to generate a swirling airflow and to produce a raw material. A pulverizing rotor that pulverizes to generate powder, a raw material supply unit that supplies the raw material to the pulverizing rotor, a hot air supply unit that supplies hot air to the powder from below, and a powder that is dried by the hot air In the airflow drying device comprising a discharge unit for discharging the body from the upper part of the casing, a protrusion is formed on the peripheral surface of the blade facing the inner wall of the casing, and the axial position of the protrusion is The blades are different from each other, and the blades having the same position in the axial direction of the protrusion are arranged symmetrically with respect to the rotation axis.
[0018]
According to this configuration, the raw material supplied from the raw material supply unit onto the pulverization rotor is pulverized into a granular material by a thin blade, swirled while being blown up inside the casing by the hot air supplied from the hot air supply unit, and dried. After that, it is discharged from the discharge section.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to the drawings. For convenience of explanation, the same parts as those of the conventional example shown in FIG. FIG. 1 is a schematic configuration diagram showing a drying system using the airflow drying apparatus of the first embodiment. A raw material supply unit 9 that has a hopper 14 and supplies raw materials into the air flow drying device 25 is provided at a substantially central portion of the air flow drying device 25.
[0020]
A hot air generator 24 for supplying hot air into the airflow drying device 25 is connected to the lower side of the raw material supply unit 9. An exhaust duct 7 is provided in the upper part of the airflow drying device 25, and the granular material crushed and dried in the airflow drying device 25 is discharged from the airflow drying device 25 together with water vapor.
[0021]
A collector 26 is connected to the exhaust duct 7, and a blower 27 is connected to the collector 26. The granular material is sucked into the collector 26 by the drive of the blower 27 and is collected as shown by an arrow A. The water vapor discharged from the exhaust duct 7 passes through the blower 27 and is released to the outside.
[0022]
FIG. 2 shows a cross-sectional view of the airflow drying device 25. In the figure, the grinding rotor 12 shows the AOA ′ cross section of FIG. 4 described later. The air flow drying device 25 is covered with a casing 5 including a cylindrical upper casing 5a, a liner 5b, and a lower casing 5c. The upper casing 5a and the lower casing 5c are formed of a steel plate or the like.
[0023]
The liner 5b is formed of a material having higher strength than the upper casing 5a and the lower casing 5c in order to prevent damage and wear caused by the collision of raw materials due to the rotation of the crushing rotor 12 described later.
[0024]
The flanges 5d and 5e are integrated with the liner 5b by a plurality of bolts 36. The upper casing 5 a is fastened to the flange portion 5 d via a gasket 57 with a plurality of bolts 58 and nuts 59. The lower casing 5c is fastened to the flange portion 5e via a gasket 57 with a plurality of bolts 49 and nuts 50. The gasket 57 is provided to maintain airtightness in the housing 5. A rectifying plate 40 that rectifies the rising airflow is provided between the lower casing 5c and the flange portion 5e.
[0025]
An inflow port 1 is opened in the lower casing 5c, and hot air from the hot air generator 24 (see FIG. 1) is taken into the housing 5. A bottom plate 51 is welded to the lower end of the lower casing 5c. A housing 55 for bearings 43, 44, 45 is attached to the bottom plate 51 by bolts 54. The bottom plate 51 is attached with a dust-proof cover 52 with bolts 53 to prevent the powder particles from entering the housing 55.
[0026]
A shaft 42 is fitted into the bearings 43, 44, 45. A pulley 41 is attached to the lower end of the shaft 42 and is connected to the drive motor 10 (see FIG. 1) via a belt (not shown). Further, oil tubes 56a and 56b for lubricating from the upper side of the bearings 43, 44, and 45 and waste oil from the lower side are connected to an oiling device (not shown) so as to circulate the lubricating oil.
[0027]
A flange 46 is attached to the upper end of the shaft 42 with a bolt 47. A grinding rotor 12 composed of a disc (plate member) 32 and a blade 31 is attached to the flange 46 by bolts 48. 4 is a top view of the grinding rotor 12, and FIG. 5 is a cross-sectional view taken along AOA ′ of FIG. As shown in these drawings, a plurality of blades 31 having a thickness t project from the outer periphery of the disc 32 and are erected radially so as to face the liner 5b (see FIG. 2).
[0028]
The blade 31 has a support portion 31 b on the bottom surface side, and the blade 31 is erected by inserting the support portion 31 b into first grooves 32 a provided radially on the disc 32. The supporting portion 31b is provided with an extending portion 31c extending in the inner diameter direction, and a groove portion 31d is formed on the upper surface side of the extending portion 31c.
[0029]
An annular second groove 32 b is formed in the disc 32. The blade 31 is installed so that the groove 31d is concentric with the second groove 32b, and the annular member 33 is fitted into the groove 31d and the second groove 32b. The annular member 33 is fixed to the disc 32 by a bolt 33a, and thereby the blade 31 is held. Therefore, the blade 31 can be easily attached and detached.
[0030]
The blade 31 has three types of shapes. The blade 31s is formed with a protrusion 35 protruding radially in the lower part of the peripheral surface. The blade 31t is formed with a protrusion 35 protruding radially in the upper part of the peripheral surface. As shown in FIG. 6, the blade 31 u is not formed with the protrusion 35.
[0031]
The outer diameter d3 of the blade 31u is smaller than the outer diameter d1 of the protruding portion 35 of the blades 31s and 31t, and is substantially equal to the outer diameter d2 of the portion where the protruding portion 35 is not formed. As a result, the peripheral surface of the blade 31u is separated from the liner 5b, and the protrusions 35 of the blades 31s and 31t come close to the liner 5b to scrape off the powder particles adhering to the liner 5b.
[0032]
In this embodiment, a total of 12 blades 31s, 2 blades 31t, 2 blades 31t, and 8 blades 31u are erected on the disk 32, and are the same with respect to the rotation axis (point O) of the grinding rotor 12. Shaped blades are arranged symmetrically. That is, the two blades 31s are arranged symmetrically with respect to the rotation axis, and the two blades 31t are arranged symmetrically with respect to the rotation axis. The number of blades is not limited to this embodiment.
[0033]
In FIG. 2, a guide ring 30 that is substantially concentric with the housing 5 is provided above the grinding rotor 12 to separate the outer peripheral portion and the inner peripheral portion of the housing 5. Above the crushing unit 3 facing the guide ring 30, a raw material supply unit 9 projects from the housing 5. Due to the rotation of the screw feeder 9 a provided in the raw material supply unit 9, a massive raw material is dropped and supplied onto the grinding rotor 12 from the discharge port 9 b.
[0034]
The raw material supplied onto the pulverizing rotor 12 is guided in the outer peripheral direction by the centrifugal force generated by the rotation of the pulverizing rotor 12 and pulverized into powder particles by the blade 31. Thereby, the grinding | pulverization part 3 which grind | pulverizes a raw material is comprised. A conical cover 34 is provided on the disc 32 in order to prevent the raw material from entering the shaft 42 and to facilitate the movement of the raw material in the outer circumferential direction of the grinding rotor 12.
[0035]
A glass viewing window 39 through which the inside of the housing 5 can be viewed is provided at the side of the upper casing 5a. A classification unit 6 is attached to the upper part of the upper casing 5a. FIG. 3 is a cross-sectional view showing the classification unit 6. The classifying unit 6 includes a classifying rotor 79, and the rotation driving unit of the classifying rotor 79 is covered by an upper cover 71 and a lower cover 70 that are fastened by a plurality of bolts and nuts (all not shown).
[0036]
The housings 75a and 75b of the bearings 68 and 69 are welded inside the upper cover 71, and the shaft 63 is fitted into the bearings 68 and 69. An angle 72 for installing the drive motor 8 (see FIG. 1) is provided on the side of the upper cover 71. The shaft 63 is connected to the drive motor 8 via a belt (not shown) and is driven to rotate by the drive motor 8. A photoelectric switch 74 that detects the number of rotations of the shaft 71 is provided above the upper cover 71.
[0037]
The lower end of the lower cover 70 is opened so that the shaft 63 penetrates into the upper casing 5a. The upper part of the lower cover 70 is shielded by a seal member 76. An opening 70a is formed on the peripheral surface of the lower cover 70, and a circular tube 77 covering the opening 70a is welded.
[0038]
An exhaust duct 7 is constituted by the lower cover 70 and the circular pipe 77. Thereby, the cross-sectional area of the exhaust passage around the shaft 63 is made wider than the exhaust duct 7 formed by a curved circular pipe as in the conventional example (see FIG. 8), and the powder particles adhering to the inner wall of the exhaust duct 7 Prevents obstruction by the body.
[0039]
An outer cylinder 64 that rotates integrally with a key 67 is fitted on a shaft 63 that passes through the lower cover 70. The outer cylinder 64 is integrated with a thin scraper 66 that scrapes off particles adhering to the inner wall of the lower cover 70. The scraper 66 is formed with a hole 66a for reducing pressure loss in the exhaust duct 7.
[0040]
A disc 61 is attached to the lower end of the shaft 63 protruding into the upper casing 5a by a bolt 62, and is integrally rotated by a key 78. A plurality of classification blades 13 made of thin plates are provided on the disc 61 in a radial manner. The upper end of each classification blade 13 is welded by a ring-shaped annular member 65. Accordingly, the classification rotor 79 composed of the disc 61, the classification blade 13 and the annular member 65 is rotated integrally with the shaft 63.
[0041]
According to the air dryer 25 having the above-described configuration, the bulk material containing moisture falls on the crushing rotor 12 that rotates in the direction D by the drive motor 10 by the rotation of the screw feeder 9a. Centrifugal force is applied to the raw material by the rotation of the grinding rotor 12, and the raw material is guided toward the outer periphery of the grinding rotor 12. Then, the raw material collides with the blade 31 and is pulverized into particles.
[0042]
As the hot air generator 24 (see FIG. 1) is driven, hot air flows from the inflow port 1 as indicated by an arrow B1, passes through the outside of the dustproof cover 55 as indicated by an arrow B2, and is a disk as indicated by an arrow B3. 32 passes through the gap between the liner 5b. At this time, the granular material pulverized by the blade 31 is swirled upward while being further dispersed by the hot air, and the granular material is placed inside the housing 5 together with the hot air outside the guide ring 30 as indicated by an arrow B4. To rise.
[0043]
Further, the lower part of the granular material adhering to the liner 5b facing the grinding rotor 12 is scraped off by the projection 35 of the blade 31s, and the upper part is scraped off by the projection 35 of the blade 31t. The granular material thus scraped rises in the housing 5 together with hot air.
[0044]
The classification blade 13 that is rotated by the drive of the drive motor 8 generates a swirling airflow. Centrifugal force due to the swirling airflow acts on the granular material that has moved up inside the housing 5 and has reached the vicinity of the classification unit 6. Further, since the granular material is sucked into the exhaust duct 7, centripetal force works. The granular material that is not sufficiently dried has a greater centrifugal force, and after being blown to the outside of the classification unit 6, the powder is moved down the guide ring 30 and guided to the crushing unit 3. As a result, the granular material is circulated between the inner peripheral side and the outer peripheral side of the guide ring 30 to be sufficiently dried.
[0045]
The granular material that has been sufficiently dispersed and dried by discharging air and water vapor has a greater centripetal force, and enters the inside of the classifying unit 6 from the gap 6b between the classifying blades 13 as indicated by an arrow B5. Thereby, the granular material is classified by the classification unit 6. And as shown by arrow B6, it is discharged | emitted from the exhaust port 7a of the exhaust duct 7, and the dry granular material of a uniform magnitude | size is obtained.
[0046]
According to the present embodiment, the protrusions 35 that are close to the liner 5b are formed on the blade 31 of the crushing rotor 12, so that the powder particles adhering to the liner 5b are scraped off by the protrusions 35 having a small contact area. For this reason, a granular material can be easily removed in a state where the load fluctuation of the drive motor 10 is small. Therefore, the drive motor 10 with a low maximum output can be used, and the manufacturing cost of the airflow drying device can be reduced. Further, since the contact area of the protrusion 35 is small, the blade 31 can be prevented from being deformed.
[0047]
Further, the blade 31s having the protrusion 35 at the lower part is arranged at a position symmetrical to the rotation axis, and the blade 31t having the protrusion 35 at the upper part is arranged at a position symmetrical to the rotation axis. The rotor 12 receives substantially the same force at symmetrical positions. For this reason, axial twist applied to the grinding rotor 12 is suppressed, and deformation of the grinding rotor 12 can be prevented. Depending on the blade, for example, the protrusions 35 may be formed at the upper, middle, and lower portions of the blade, or may be formed at many different positions.
[0048]
Furthermore, the axial length L2 (see FIG. 5) of the protrusion 35 formed on the upper portion of the blade 31t is larger than the axial length L1 (see FIG. 5) of the protrusion 35 formed on the lower portion of the blade 31s. ) Is shortened. For this reason, since the force applied to the upper part away from the disc 32 is small and the bending moment is reduced, the deformation of the blade 31 can be prevented.
[0049]
In addition, no projection 35 is formed on the blade 31u, and a large force is not applied because the distance from the liner 5a is large. Thereby, the load added to the whole grinding | pulverization rotor 12 can be reduced, and the output of the drive motor 10 can be made lower.
[0050]
Next, FIG. 7 is sectional drawing which shows the airflow drying apparatus 25 of 2nd Embodiment. The same parts as those in the first embodiment shown in FIGS. 1 to 6 are given the same reference numerals. The raw material supply unit 9 of this embodiment is provided with a pipe 91. The grinding rotor 12 has the same configuration as that shown in FIGS. 4 and 5 described above, and a disk 92 having an opening 92 b through which the pipe 91 is inserted is fixed to the grinding rotor 12 by bolts 95. The disc 92 is formed with a flat plate portion 92a having a predetermined amount of gap with the disc 32 with a washer (not shown) or the like interposed therebetween.
[0051]
The raw material supply unit 9 has a heater (not shown) for heating the raw material in the pipe 91. Slurry or liquid raw material in which powder is mixed with water is stored in a raw material tank (not shown), heated by a heater, and sent into the housing 5.
[0052]
In addition, a classification unit 6 similar to the conventional example (see FIG. 8) is provided on the upper portion of the housing 5. When the classification unit 6 is removed from the upper casing 5a and replaced with the exhaust duct 7 ', the granular material can be discharged without using the classification rotor 79. At this time, it is possible to classify the particles by appropriately selecting the inner diameter of the exhaust duct 7 ′ and the amount of protrusion into the upper casing 5a. Other configurations are the same as those of the first embodiment.
[0053]
According to the air flow drying device 25 having the above-described configuration, the slurry or liquid raw material in which the granular material is mixed with a large amount of water passes through the pipe 91, and moisture is evaporated by heating the heater. Thereby, the flow velocity of the raw material in the pipe 91 is increased to become a turbulent flow, the heat transfer effect is improved, and water is further evaporated.
[0054]
Then, the raw material is introduced into the housing 5, and the raw material containing water and water vapor flows down in the pipe 91 and is supplied onto the disk 32 from the opening 92 b of the disk 92. Since the raw material spreads in the gap between the disk 92 and the disk 32 due to the surface tension, the raw material is dispersed throughout the circumferential direction of the disk 32.
[0055]
Thereafter, the raw material is dispersed into fine droplets by the rotating blade 31, and heat exchange with hot air is performed. Thereby, even a slurry or a liquid raw material can be sufficiently dried. In addition, although a drying efficiency falls, you may send a raw material in the housing | casing 5 with normal temperature.
[0056]
In this embodiment, the same effect as that of the first embodiment can be obtained. That is, since the projections 35 are formed on the blade 31, the drive motor 10 having a small maximum output can be used. Further, the force applied to the blade 31 is reduced, and the blades having the same shape are arranged symmetrically to prevent twisting and to prevent the blade 31 from being deformed.
[0057]
Further, since the axial length of the projection 35 formed on the upper part of the blade is shorter than the axial length of the projection 35 formed on the lower part of the blade, the bending moment is reduced and the blade is reduced. The deformation of 31 can be prevented. In addition, since the projections 35 are not formed on the blade 31u, the load applied to the grinding rotor 12 can be reduced and the output of the drive motor 10 can be further reduced.
[0058]
【The invention's effect】
According to the present invention, since the protrusion is formed on the blade of the grinding rotor, the granular material adhering to the inner wall of the casing is scraped off by the protrusion having a small contact area. For this reason, a granular material can be easily removed in the state with few load fluctuations of the drive motor of a grinding | pulverization rotor. Therefore, a drive motor with a low maximum output can be used, and the manufacturing cost of the airflow drying device can be reduced. Further, since the contact area of the protrusion is small, the blade can be prevented from being deformed.
[0059]
In addition, the blades having the protrusions with different axial positions are provided, and the blades with the same axial position of the protrusions are arranged symmetrically with respect to the rotation axis. Power is added. For this reason, axial twist applied to the grinding rotor is suppressed, and deformation of the grinding rotor can be prevented.
[0060]
Also, according to the present invention, the axial length of the protrusion provided on the upper part of the blade is shorter than the protrusion provided on the lower part of the blade, so that the force applied to the upper part away from the plate-like member is small. Since the bending moment is reduced, deformation of the blade can be prevented.
[0061]
Further, according to the present invention, since the protrusion is provided only on some of the blades and the outer periphery of the blade without the protrusion is on the inner peripheral side with respect to the outer periphery of the protrusion, the blade without the protrusion and the inner wall of the housing A large force is not applied because of the large distance. Therefore, the load applied to the entire grinding rotor can be reduced and the output of the drive motor can be further reduced.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing a drying system using an airflow drying apparatus according to a first embodiment of the present invention.
FIG. 2 is a cross-sectional view showing the airflow drying apparatus according to the first embodiment of the present invention.
FIG. 3 is a cross-sectional view showing a classification unit of the airflow drying apparatus according to the first embodiment of the present invention.
FIG. 4 is a plan view showing a crushing rotor of the air flow drying device according to the first embodiment of the present invention.
5 is a cross-sectional view taken along the line AOA ′ of FIG.
FIG. 6 is a side view showing one blade of the air flow drying device according to the first embodiment of the present invention.
FIG. 7 is a cross-sectional view showing an airflow drying apparatus according to a second embodiment of the present invention.
FIG. 8 is a cross-sectional view showing a conventional airflow drying apparatus.
FIG. 9 is a plan view showing a classification blade of a conventional airflow drying apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Inflow port 3 Crushing part 4 Blade 5 Case 5a Upper casing 5b Liner 5c Lower casing 6 Classification part 7, 7 'Exhaust duct 8, 10 Drive motor 9 Raw material supply part 9a Screw feeder 12 Crushing rotor 13 Classification blade 14 Hopper 24 Hot air Generator 25 Airflow drying device 26 Collector 27 Blower 31, 31s, 31t, 31u Blade 32 Disc 33 Annular member 35 Protrusion 39 Viewing window 40 Current plate 42 Shaft 43, 44, 45 Bearing 46 Flange 51 Bottom plate 52 Dust-proof cover 55 Housing 57 Gasket 61 Disk 63 Shaft 65 Annular member 66 Scraper 68, 69 Bearing 79 Classification rotor 91 Pipe 92 Disc

Claims (5)

In a crushing rotor comprising a plate-like member and a plurality of blades erected radially on the plate-like member, generating a swirling airflow by rotation and crushing a raw material supplied to the blade,
Protruding portions are formed on the peripheral surface of the blade, the blades having the axial positions of the protruding portions different from each other are provided, and the blades having the same axial position of the protruding portions are arranged symmetrically with respect to the rotation axis A pulverizing rotor characterized by the above. 2. The grinding rotor according to claim 1, wherein the protruding portion is provided only on a part of the blades, and the outer periphery of the blade not having the protruding portion is located on the inner peripheral side of the outer periphery of the protruding portion. 3. The grinding rotor according to claim 1, wherein an axial length of the projecting portion provided on the upper portion of the blade is shorter than that of the projecting portion provided on the lower portion of the blade. . The plate-like member has a first groove formed radially and a second groove formed in an annular shape, and the blade has an extended part extending in a radial direction on the bottom side and an upper surface side of the extended part The blade portion is held by fitting an annular member into the second groove together with the groove portion of the blade fitted into the first groove. Item 4. The grinding rotor according to any one of Items 3 to 4. Pulverization that has a vertical cylindrical casing and a plurality of blades erected on a plate-like member in a radial manner, generates a swirling airflow by rotation within the casing, and pulverizes the raw materials to generate powder particles A rotor, a raw material supply unit that supplies the raw material to the pulverization rotor, a hot air supply unit that supplies hot air to the granular material from below, and a granular material dried by the hot air is discharged from the upper part of the housing In the air flow drying device including the discharge unit,
Protruding portions are formed on the peripheral surface of the blade facing the inner wall of the housing, and the blades having different axial positions of the protruding portions are provided, and the blades having the same axial position of the protruding portions are provided. An airflow drying apparatus characterized by being arranged symmetrically with respect to a rotation axis.

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