WO2007145207A1 - Classificateur de flux d'air et usine de classement - Google Patents

Classificateur de flux d'air et usine de classement Download PDF

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Publication number
WO2007145207A1
WO2007145207A1 PCT/JP2007/061807 JP2007061807W WO2007145207A1 WO 2007145207 A1 WO2007145207 A1 WO 2007145207A1 JP 2007061807 W JP2007061807 W JP 2007061807W WO 2007145207 A1 WO2007145207 A1 WO 2007145207A1
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WO
WIPO (PCT)
Prior art keywords
powder
air
classification chamber
classification
fine powder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2007/061807
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English (en)
Japanese (ja)
Inventor
Hiroichi Kawasaki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Pneumatic Manufacturing Co Ltd
Original Assignee
Nippon Pneumatic Manufacturing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Pneumatic Manufacturing Co Ltd filed Critical Nippon Pneumatic Manufacturing Co Ltd
Priority to JP2008521214A priority Critical patent/JP4907655B2/ja
Publication of WO2007145207A1 publication Critical patent/WO2007145207A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G03G9/0802—Preparation methods
    • G03G9/0817—Separation; Classifying
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B7/00—Selective separation of solid materials carried by, or dispersed in, gas currents
    • B07B7/08—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force
    • B07B7/086—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force generated by the winding course of the gas stream
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B7/00—Selective separation of solid materials carried by, or dispersed in, gas currents
    • B07B7/08—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force
    • B07B7/10—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force having air recirculating within the apparatus

Definitions

  • the present invention relates to an airflow classifier and a classification plant that classify powder such as developing toner for a copying machine into fine powder and coarse powder.
  • Patent Document 1 Conventionally, a power classifier described in Patent Document 1 is known as an air classifier that rotates powder at a high speed and centrifuges it into fine powder and coarse powder.
  • FIG. 10 shows an airflow classifier described in Patent Document 1.
  • This airflow classifier is provided with a classification plate 81 inclined in an upward gradient from the outer periphery toward the center in the casing 80, and a classification cover 82 is provided on the classification plate 81, and the classification cover 82 and the classification plate 81
  • a plurality of louvers are annularly arranged on the peripheral wall of the classification chamber 83 formed between them, and an inflow passage 84 is provided between the adjacent louvers to allow secondary air to swirl into the classification chamber 83.
  • a powder guide cylinder 85 is provided at the upper part of the casing 80, and a powder supply cylinder 86 facing in a tangential direction is provided on the outer periphery of the powder guide cylinder 85, and the powder supply cylinder 86
  • a solid-gas mixed fluid of powder and high-pressure air is supplied into the guide cylinder 85, and the powder that descends while rotating around the outer periphery of the powder guide cylinder 85 is supplied to the outer periphery of the classification cover 82. It is swirled into the classification chamber 83 from the port 87, and the swirl speed of the powder is accelerated by the secondary air flowing into the classification chamber 83 from the inflow path 84, and the powder is centrifuged into fine powder and coarse powder. Then, the fine powder moving to the center of the classification chamber 83 is sucked into the fine powder discharge cylinder 88 connected to the center of the classification plate 81.
  • the coarse powder swirling around the outer periphery of the classification chamber 83 is discharged from a coarse powder discharge port 89 formed on the outer periphery of the classification plate 81.
  • Patent Document 1 JP-A-11 138103
  • the powder is swirling in the classification chamber 83.
  • the secondary air is introduced into the classification chamber 83 from the inflow channel 84, and the swirling speed of the powder is accelerated by the secondary air. Therefore, the swirling airflow of the solid-gas mixed fluid flowing into the classification chamber 83 is used.
  • the swirl vortex is disturbed by the confluence of the swirling airflow of the secondary air and the powder cannot be swirled cleanly at a high speed, so accurate classification cannot be performed.
  • there are still points to be improved such as the separation particle size cannot be reduced due to the increased speed in the center acting on particles with a large amount of air flowing from the powder guide tube 85 into the classification chamber 83. It was.
  • the height of the classification chamber 83 is increased or the inner diameter is increased to adjust the powder classification point. Is increased, the swirling speed of the powder in the classification chamber 83 decreases and the powder cannot be accurately centrifuged, so the powder in the restricted small volume classification chamber 83 It is necessary to perform classification with a high mixing ratio of air and air. For this reason, it cannot be said that the classification accuracy is good, and there are still points to be improved in improving the classification accuracy.
  • toner used in an image forming apparatus such as a copying machine cannot form a clear image if it contains particles larger than necessary or smaller than necessary. . Therefore, in the toner production plant, the fine powder classified by the first air flow classifier is supplied to the second air flow classifier, and the fine powder is classified into fine powder and ultra fine powder. It is a product.
  • An object of the present invention is that it is possible to classify powders with a small particle size with high accuracy with a single-stage classifier and to reduce facility costs and running costs. It is to provide a flow classifier and a classification plant.
  • a classification plate is provided in the casing, and a substantially cylindrical primary classification chamber is provided in the casing on the outer peripheral portion of the upper surface of the classification plate.
  • a secondary classification chamber having a substantially cylindrical or pyramidal shape smaller in diameter than the primary classification chamber on the same axis as the primary classification chamber, and jetting high-pressure air at the lower peripheral wall of the primary classification chamber, or externally
  • An air nozzle that forms a swirling airflow in the primary classification chamber by air suction is provided, a coarse powder discharge port is formed between the outer periphery of the classification plate and the inner peripheral surface of the casing, and fine powder suction formed at the center of the classification plate
  • a fine powder discharge tube is connected to the mouth, an annular powder supply header is provided on the outer peripheral portion of the peripheral wall of the secondary classification chamber, and powder is supplied to the powder supply header in the circumferential direction of the inner periphery. Connected to the inner wall of the powder supply header. Therefore, a
  • the position of the inflow hole for swirling the powder is higher than the coarse powder outlet, and the force is located on the inner diameter side of the coarse powder outlet. There is no such thing as an immediate fall.
  • Centrifugal separation is effective, and the coarse powder spreads outward in the radial direction, swirls and descends, flows into the primary classification chamber, is centrifuged in the primary classification chamber, and is discharged into the coarse powder discharge loca. On the other hand, the fine powder descends on the swirling vortex and is sucked and discharged together with air.
  • a ring-shaped air supply header that supplies high-pressure air to each of the plurality of air nozzles and an air supply cylinder that sends high-pressure air to the air supply header are provided around the outer peripheral wall of the primary classification chamber.
  • the swirl vortex formed in the center of the secondary classification chamber shifts in the radial direction of the secondary classification chamber and becomes unstable, it may not be possible to perform accurate classification. It is preferable to stabilize the swirl vortex by providing a conical or cylindrical center core at the center of the top wall of the secondary classification chamber.
  • the exhaust port force can also exhaust the air in the secondary classification chamber, so the exhaust resistance is reduced and the pressure in the primary classification chamber and the secondary classification chamber is reduced.
  • An abnormal rise can be prevented, and a small blower that applies suction to the fine powder discharge cylinder or a blower that supplies high-pressure air to the air supply cylinder can be used. It is also possible to obtain fine powder having different particle diameters at the exhaust port and the fine powder discharge cylinder.
  • the classification point can be adjusted if the height dimension of the primary classification chamber can be adjusted or the height dimension of the secondary classification chamber can be adjusted.
  • the secondary classification chamber is divided into a plurality of stages in the vertical direction and the inner diameter is made smaller as it reaches the upper stage side of the secondary classification chamber, the powder is separated in the classification chamber of each stage of the secondary classification chamber.
  • the swirl diameter of the airflow decreases and the speed increases as it reaches the secondary classification chamber on the upper stage side, so that it is possible to obtain fine powder with a small particle size with very little coarse powder contamination. .
  • the inflow hole is an annular slit or a plurality of arc-shaped slits arranged at intervals in the circumferential direction
  • the powder is in the secondary classification chamber, and the bowl is in the circumferential direction of the primary classification chamber of Since the powder is supplied almost uniformly from the whole, the powder can be classified very effectively.
  • the air classifier and the solid-gas separator that separates the solid-gas mixed fluid fed from the fine powder discharge cylinder of the air classifier into fine powder and air.
  • the air outlet force of the solid-gas separator The dust collector that collects the powder in the air that is being sent in to clarify the air, and the force that applies suction to the dust collector or the high pressure air to the air nozzle A structure that also has a blower and power to feed the machine.
  • a pulverizer for pulverizing powder is connected to the lower end outlet of the casing of the airflow classifier, and a powder supply cylinder for supplying the powder to the powder outlet portion and the powder supply header of the pulverizer And a powder supply pipe in the middle of the circulation path, the coarse powder discharged from the lower end opening of the casing is pulverized by a pulverizer and returned to the powder supply header. Since it is sent to the air classifier from the powder supply header and subjected to the classification process again, a product with a highly accurate particle size distribution can be obtained.
  • a second air classifier that classifies fine powder fed from the powder outlet of the solid-gas separator of the first classification plant into fine powder and super fine powder, and the second air flow.
  • the second solid-gas separator that separates the solid-gas mixed fluid sent from the classifier into ultrafine powder and air, and the powder in the air sent from the solid-gas separator are collected.
  • a second dust collector that clarifies the air
  • the fine powder classified in one of the airflow classifiers can be continuously classified through the second airflow classifier.
  • the separated extremely small particle size! / Salt fine powder is recovered by a bag filter, and a fine powder with a small particle size distribution width can be obtained. For this reason, when the toner is manufactured, the toner can be manufactured continuously, and the toner can be manufactured extremely efficiently.
  • a classification chamber is formed on a classification plate provided in the casing, and the powder is swirled at a high speed in the classification chamber to be separated into coarse powder and fine powder.
  • An air classifier for primary treatment that discharges the coarse powder downward from the coarse powder discharge port formed in the outer peripheral portion of the classification plate and discharges the fine powder from the fine powder discharge cylinder connected to the center of the classification plate;
  • the coarse powder discharged from the lower end of the casing of the air classifier is pulverized, and the pulverized powder is circulated in the classification chamber of the air classifier, and the fine powder discharge cylinder force feed
  • a solid-gas separator that separates the mixed gas-solid fluid into fine powder and air
  • an air classifier for secondary treatment according to the present invention that classifies the fine powder fed from the solid-gas separator;
  • the solid-gas separator that separates the solid-gas mixed fluid fed from the fine powder discharge cylinder of the air classifier for the secondary treatment into air and ultrafine powder, and the
  • the airflow classifier when high-pressure air is injected into the air nozzle force primary classification chamber, the high-pressure air swirls in the primary classification chamber to form a swirling airflow, The swirl flow rises while swirling along the inner wall of the secondary classification chamber, and the swirl flow of the powder swirling in the powder supply header is supplied from the narrow inlet hole into the swirl flow. The swirling airflow swirling in the classification chamber is not disturbed, so that the powder can be classified with high accuracy.
  • the powder is first classified into coarse powder and intermediate powder (fine powder partially containing coarse powder) in the primary classification chamber, and then the intermediate powder is guided to the secondary classification chamber to obtain coarse powder and fine powder. Therefore, it is possible to perform a highly accurate classification process in which the coarse powder is less likely to be mixed in the fine powder. For this reason, processing was conventionally performed using a two-stage air classifier, but it can now be processed using a one-stage air classifier.
  • the classification process is performed with a small amount of air for supplying powder, the amount of air in the classification chamber can be reduced. Therefore, in the classification plant employing the air classifier of the present invention, it is possible to employ a small blower, a solid-gas separator for collecting fine powder, and powder in the air separated from the solid-gas separator. Since a small dust collector that collects the body can be adopted, the equipment cost and running cost can be reduced.
  • the fine powder classified by the primary airflow classifier is classified by the secondary airflow classifier according to the present invention, so that the coarse powder and the superfine powder are obtained.
  • Fine powder can be obtained with very little mixing of fine powder and a narrow particle size distribution width.
  • FIG. 1 is a schematic view showing an embodiment of an air classifier according to the present invention.
  • FIG. 6 Cross section showing another example of air nozzle
  • FIG. 7 Schematic diagram showing another example of a classifying plant using the air classifier shown in Fig. 1 ⁇ 8] Schematic diagram showing still another example of a classifying plant using the air classifier shown in Fig. 1.
  • FIG. 9 Schematic diagram showing another example of a classification plant according to the present invention
  • FIG.10 Schematic diagram showing a conventional air classifier
  • 1 to 4 show an embodiment of an air classifier according to the present invention.
  • the air classifier A has a casing 2.
  • the casing 2 is divided into an upper casing 3 and a lower casing 4, and a support cylinder 5 having an internal thread formed on the inner periphery is provided on the central axis of the lower casing 4.
  • the support cylinder 5 is fixedly arranged, and a plurality of spacers 6 are incorporated on an inward flange 5a provided at the lower end thereof. Further, a screw cylinder 7 a provided at the center of the lower surface of the classification plate 7 is screwed into the support cylinder 5.
  • the height of the classification plate 7 is adjusted by increasing or decreasing the number of the spacers 6 incorporated in the support cylinder 5.
  • the upper surface of the classification plate 7 has a conical shape inclined with an upward gradient from the outer periphery toward the center, and an annular coarse powder discharge port 8 is provided between the outer periphery and the inner periphery of the casing 2.
  • the classifying plate 7 has a conical shape, but may have a flat plate shape.
  • the upper part of the inner periphery of the screw cylinder 7 a is a tapered hole 9, and a tapered ring 10 is detachably fitted in the tapered hole 9.
  • the inside of the tenor ring 10 is a fine powder suction port 11.
  • the tenoring 10 has a tapered fine powder suction port 11 whose upper end is a small diameter end. However, it is possible to use ones with various diameters such as a tenoring having a tapered fine powder suction port whose upper end is a large diameter end.
  • Fine powder discharge cylinder 12 is L-shaped
  • the tip part penetrates a part of the lower casing 4 and faces the outside.
  • the upper casing 3 has a scat part 14 that forms a primary classification chamber 13 with the outer peripheral part of the upper surface of the classification plate 7, and a cylindrical part 15 that rises from the inner diameter part of the skirt part 14, The inside of the cylindrical portion 15 is a secondary classification chamber 16.
  • the skirt portion 14 may be a horizontal one or one having a larger inclination than the classification plate, without a force inclination showing an inclination parallel to the classification plate 7! /.
  • a plurality of spacers 17 are incorporated between the facing surfaces of the skirt portion 14 and the lower casing 4, so that the height of the primary classification chamber 13 can be adjusted by increasing or decreasing the number of the spacers 17. There is.
  • the cylindrical portion 15 includes a stepped cylindrical portion including a lid 15a, an upper ring 15b whose upper end opening is closed by the lid 15a, and a lower ring 15c having a larger diameter than the upper ring 15b.
  • the secondary classification chamber 16 in the cylindrical portion 15 is divided into an upper secondary classification chamber 16a in the upper ring 15b and a lower secondary classification chamber 16b in the lower ring 15c.
  • the height of the upper secondary classification chamber 16a can be adjusted by replacing the upper ring 15b with an upper ring having a different height, and the lower secondary classification chamber 16b can also be adjusted to the lower ring.
  • the height can be adjusted by changing the ring 15c to a lower ring with a different height.
  • the upper wall of the upper secondary classification chamber 16a can be moved up and down to adjust the height of the upper secondary classification chamber 16a.
  • the height of the secondary secondary classification room 16b may be adjusted.
  • the upper secondary classification chamber 16a here it is a conical shape with a smaller diameter as it reaches the upper side of the force shown for a cylindrical one.
  • the lid 15a, the upper ring 15b, and the lower ring 15c are held in an assembled state in which the upper casing 3 is formed by the connecting means 20.
  • the connecting means 20 a plurality of support pieces 21 are provided on the outer periphery of the lower casing 4, and the upper end of the screw shaft 22 whose lower end is fixed to each support piece 21 is fixed to the upper surface of the top wall of the lid 15a. Pierce through the connecting piece 23 The knob 24 is screwed to the upper end of the screw shaft 22 and tightened.
  • a core insertion hole 25 is formed in the center of the top wall of the lid 15a, and the center core 26 is slidably inserted into the core insertion hole 25.
  • the center core 26 includes an outer core 26a and an inner core 26b slidably inserted into the outer core 26a.
  • a conical surface 27 is provided below the outer core 26a and the inner core 26b.
  • An exhaust port 26c is formed on the central axis of the inner core 26b.
  • a flange 28 is provided at the upper end of the inner core 26b, and a height adjusting ring 29 is assembled between the flange 28 and the upper ring lid 15a. Therefore, the length of the inner core 26b protruding into the secondary classification chamber 16 can be adjusted by replacing the height adjustment ring 29 with another height adjustment ring 29 having a different length.
  • a bolt 30 for fixing 26 is screwed and fixed to the lid 15a.
  • An annular air supply header 31 is provided on the outer side of the joint portion between the upper casing 3 and the lower casing 4, and an air supply cylinder 32 is connected to an outer periphery facing position of the air supply header 31.
  • a plurality of air nozzles 33 are provided at equal intervals on the inner periphery of the air supply header 31. Each air nozzle 33 injects the high-pressure air supplied into the air supply header 31 toward the outer peripheral portion of the primary classification chamber 13 in the circumferential direction.
  • An annular powder supply header 34 is provided on the outer periphery of the lower ring 15c, and a plurality of powder supply cylinders 35 are connected to the powder supply header 34 at equiangular positions.
  • the powder supply cylinder 35 is configured to inject powder in the circumferential direction of the outer periphery of the powder supply header 34, and is injected into the primary classification chamber 13 from the injection direction of the powder and the air nozzle 33. This is the same direction as the high-pressure air injection direction.
  • the inner peripheral wall of the powder supply header 34 is provided with an inflow hole 36 formed of an annular slit for allowing the powder swirling therein to swirl into the lower secondary classification chamber 16b.
  • the inflow hole 36 may be opened at the upper part of the peripheral wall of the primary classification chamber 13 so that the powder flows into the upper outer periphery of the primary classification chamber 13 or the powder supply header 34 You may provide in the outer peripheral part of the surrounding wall of a secondary classification chamber. Further, it is formed on the bottom wall of the powder supply header 34 so that the powder swirls downward from the upper part of the lower secondary classification chamber 16b. It may be.
  • the inflow hole 36 may be composed of a plurality of arc-shaped slits arranged in an annular shape.
  • FIG. 5 shows a classification plant that employs the air classifier A configured as described above.
  • a powder supply device 50 is connected to the powder supply cylinder 35 of the airflow classifier A.
  • the powder supply device 50 sucks and disperses the powder in the hopper 53 by the high-pressure air injected from the air injection nozzle 51 into the powder supply pipe 52 and passes through the powder supply pipe 52 to the powder supply cylinder 35. Try to send it in.
  • the fine powder classified by the airflow classifier A and sucked and discharged into the fine powder discharge cylinder 12 is sent from the fine powder supply path 61 to a cyclone separator 62 as a solid-gas separator.
  • the cyclone separator 62 separates fine powder and air.
  • the product fine powder is also discharged at the outlet 63 at the lower end, and the air is sent from the air supply path 64 to the bag filter 70 as a dust collector.
  • the nog filter 70 collects powder contained in the air. Clean air is blower
  • the high-pressure air is evenly supplied into the primary classification chamber 13, and swirls at a high speed in the primary classification chamber 13 to form a swirling airflow. Is done.
  • the swirling airflow of the powder swirled from the powder supply cylinder 35 into the powder supply header 34 passes through the inflow hole 36 formed by a narrow slit, it flows in the lower secondary classification chamber 16b.
  • the powder can be swirled at a high speed in the lower secondary classification chamber 16b without disturbing the swirling swirling airflow.
  • the powder is classified into coarse powder and intermediate powder (fine powder partially containing coarse powder), and the coarse powder is primary classified. Flowed down into the chamber 13, dispersed by the swirling airflow swirling in the primary classification chamber 13, and reclassified, the primary classification chamber 1
  • the coarse powder swirling at the outer periphery of 3 is discharged to the coarse powder discharge port 8.
  • the intermediate powder swirling in the lower secondary classification chamber 16b is again classified into coarse powder and fine powder, and the coarse powder descends into the primary classification chamber 13 and enters the primary classification chamber 13. After being classified again, it is discharged from the coarse powder outlet 8.
  • the fine powder rises while swirling, and when it reaches the lower end of the upper secondary classification chamber 16a, it enters the upper secondary classification chamber 16a and rises while swirling.
  • the fine powder rises while swirling, and when it reaches the ceiling surface of the upper secondary classification chamber 16a, it changes its direction radially inward along the ceiling surface.
  • the fine powder suction port 11 has a blower 7
  • the inner diameter of the swirling vortex is a small diameter that is almost equal to the minimum inner diameter of the fine powder suction port 11, and is very small compared to the swirling vortex diameter at the time of ascending. And is effectively centrifuged into fine powder.
  • the separated coarse powder swirls and descends while spreading outward in the radial direction, reflows into the primary classification chamber 13, and is centrifuged again on the swirl flow in the primary classification chamber 13 to the outer periphery.
  • the moved coarse powder is discharged from the coarse powder outlet 8.
  • the fine powder descends along the swirl vortex and is sucked into the fine powder suction port 11.
  • the mixing ratio of the powder and high-pressure air is Since the swirl vortex formed at the center of the secondary classification chamber 16 is a swirl vortex with a small inner diameter and a high swirl speed, the powder can be classified with very high accuracy.
  • the swirling speed of the intermediate powder increases as it goes upward, and the classification accuracy can be further improved.
  • the powder can be supplied into the lower secondary classification chamber 16b with a small amount of high-pressure air, a small blower 72 can be adopted.
  • the cyclone separator 62 for collecting fine powder and the nog filter 70 for collecting powder in the air can be used in a small size, which can reduce the size of the device and reduce the equipment cost and running cost. it can.
  • the flow velocity of the swirling flow can be adjusted.
  • Classifiers can be adjusted.
  • the classification point can be adjusted by changing the inner diameter of the fine powder suction port 11.
  • a stable swirl vortex can be formed. Furthermore, by changing the number of air nozzles 33 or the cross-sectional area of the air nozzles 33, The swirling speed and dispersion state of the solid-gas mixed fluid supplied to the next classification chamber 13 can be adjusted.
  • the secondary classification chamber 16 is divided into two stages up and down, but it is not divided and may be used as a single secondary classification room or divided into three or more stages. May
  • FIG. 3 a force indicating that a plurality of air nozzles 33 provided on the inner periphery of the air supply header 31 are formed of a cylindrical body, as shown in FIG. 6, the inner periphery of the ring-shaped air supply header 31 is shown.
  • a large number of vanes 37 inclined in the circumferential direction are provided at equal intervals, and an air nozzle 33 is provided between adjacent vanes 37 to supply air from a plurality of air supply cylinders 32 extending in the tangential direction of the air supply header 31.
  • the high pressure air sent into the header 31 may be swirled into the primary classification chamber 13 from the air nozzles 33! /.
  • a large number of vanes 37 may be supported in a swingable manner, and the injection angle and opening degree of the high-pressure air may be adjusted by adjusting the angle by swinging each vane 37.
  • the force that causes the fine powder to be sucked into the fine powder discharge cylinder 12 by the blower 72 may be caused to flow into the fine powder discharge cylinder 12 by pushing the high-pressure air discharged from the blower 73 into the cylinder 32.
  • the fine powder is discharged into the fine powder discharge cylinder 12 by using the blowers 72 and 73 together. You can even let it flow into!
  • high-pressure air is sent to the air supply cylinder 32, and the high-pressure air is injected from the air nozzle 33 to the outer periphery of the primary classification chamber 13 to form a swirling airflow in the primary classification chamber 13.
  • the blower 72 shown in Fig. 5 was installed in the primary classifier 13 and the secondary classifier A of the air classifier A. 16 is a large-sized one that can provide a high degree of vacuum, and by reducing the pressure in the primary classification chamber 13 by driving the blower 72, external air is sucked into the primary classification chamber 16 from the air nozzle 33. A swirling airflow may be formed. In this case, the air supply header 31 can be eliminated.
  • FIG. 7 shows another example of the classification plant.
  • coarse powder discharged from the lower end outlet 2a of the casing 2 of the airflow classifier A is supplied into a hopper 41 of a jet mill 40 as a pulverizer.
  • the jet mill 40 guides the coarse powder supplied into the hopper 41 by high-pressure air injected from the air nozzle 42 into a grinding chamber (not shown), and collides with a collision plate provided in the grinding chamber. Since the conventional force for pulverization is also well known, its details are not shown.
  • the powder pulverized by the jet mill 40 is sent into the powder supply cylinder 35 from the circulation path 43 together with high-pressure air.
  • the coarse powder discharged from the airflow classifier A is pulverized by the jet mill 40, and the powder after the pulverization treatment is sent to the powder supply cylinder 35 for circulation and pulverized. 'By repeating the classification, a product with an accurate particle size distribution can be obtained.
  • FIG. 8 shows still another example of the classification plant.
  • the classification plant shown in this example two classification plants B shown in FIG. 5 are adopted, and the fine powder taken out from the cyclone separator 62 of one classification plant B is transferred to the powder supply cylinder 35 of the other classification plant B. It is sent in and classified again, and the ultrafine powder taken out from the cyclone separator 62 of the other classification plant B is used as the product.
  • coarse powder can be collected in one classification plant B, and fine powder and ultrafine powder can be collected in the other classification plant B, which can be classified into three types. .
  • FIG. 9 shows still another example of the classification plant.
  • the conventional air classifier A shown in Fig. 10 is adopted.
  • the air classifier A shown in Fig. 10 is used as the first air classifier.
  • any airflow classifier can be used as long as it supplies powder into the classification chamber and swirls the powder at high speed to classify it into coarse powder and fine powder.
  • any airflow classifier can be used as long as it supplies powder into the classification chamber and swirls the powder at high speed to classify it into coarse powder and fine powder.

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  • Combined Means For Separation Of Solids (AREA)

Abstract

La présente invention concerne un boîtier (2) muni d'une plaque de classement (7), possédant un port de décharge de poudre brute (8) formé autour de sa périphérie externe, ainsi qu'un cylindre de décharge de poudre fine (12) raccordé à un port d'aspiration de poudre fine (11) formé sur la partie centrale de la plaque de classification (7). Le boîtier (2) comporte une section de collerette (14) pour former une première chambre de classement (13) entre elle-même et une partie périphérique extérieure du côté supérieur de la plaque de classement (7) et une partie cylindrique (15) disposée radialement dans la section de collerette (14) pour former une seconde chambre de classement (16) coaxiale avec la première (13). Dans la périphérie extérieure de la première chambre de classement (13), on trouve une pluralité de buses d'air (33) équidistantes, à partir desquelles de l'air haute pression est injecté en périphérie extérieure de la première chambre de classement (13) pour établir un flux d'air tourbillonnant, introduit dans la seconde chambre de traitement (16) et amené à monter pendant le tourbillon. La seconde chambre de classement (16) est munie, autour de sa paroi périphérique extérieure, d'une tête d'alimentation en poudre (34) de forme annulaire et la poudre, qui a été envoyée dans la tête d'alimentation en poudre par tourbillon (34), est envoyée par tourbillonnement dans la seconde chambre de classement (16) depuis un port d'entrée (36) formé dans la paroi périphérique interne de la tête d'alimentation en poudre (34), de sorte que la poudre soit envoyée par tourbillonnement et séparée de manière centrifuge en poudre brute et poudre intermédiaire contenant la poudre brute. La poudre intermédiaire est amenée à monter, pendant qu'elle tourbillonne, le long de la face interne de la paroi périphérique de la seconde chambre de classement (16) et elle est déplacée radialement vers l'intérieur, le long du plafond de la seconde chambre de classement (16). Dans le même temps, un intense vortex de tourbillonnement descendant est généré sur la partie centrale de la seconde chambre de classement (16), pour ainsi séparer la poudre intermédiaire par centrifugation en poudre brute et poudre fine, cette dernière étant aspirée dans le cylindre de décharge de poudre fine (12).
PCT/JP2007/061807 2006-06-13 2007-06-12 Classificateur de flux d'air et usine de classement Ceased WO2007145207A1 (fr)

Priority Applications (1)

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JP2008521214A JP4907655B2 (ja) 2006-06-13 2007-06-12 気流分級機および分級プラント

Applications Claiming Priority (2)

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JP2006-163698 2006-06-13
JP2006163698 2006-06-13

Publications (1)

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WO2007145207A1 true WO2007145207A1 (fr) 2007-12-21

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PCT/JP2007/061807 Ceased WO2007145207A1 (fr) 2006-06-13 2007-06-12 Classificateur de flux d'air et usine de classement

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JP (1) JP4907655B2 (fr)
WO (1) WO2007145207A1 (fr)

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JP2010149090A (ja) * 2008-12-26 2010-07-08 Nippon Pneumatic Mfg Co Ltd 気流分級機
CN102416382A (zh) * 2010-08-26 2012-04-18 株式会社理光 分级装置、分级方法、调色剂和制造所述调色剂的方法
CN103781560A (zh) * 2011-09-14 2014-05-07 曼格特奥克斯国际有限公司 粒状物料分离器
JPWO2015194529A1 (ja) * 2014-06-16 2017-04-20 綜研化学株式会社 サイクロン型粉体分級装置
JP2017159215A (ja) * 2016-03-08 2017-09-14 株式会社栗本鐵工所 分級機能付粉砕装置
US10201836B2 (en) * 2015-01-16 2019-02-12 Nisshin Seifun Group Inc. Powder classifying apparatus
CN110694903A (zh) * 2018-07-09 2020-01-17 福建南方路面机械有限公司 细石粉分离设备及其使用方法

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JPH0857424A (ja) * 1995-08-24 1996-03-05 Nippon Pneumatic Mfg Co Ltd 気流分級機における原料供給装置
JPH09108631A (ja) * 1995-10-17 1997-04-28 Canon Inc トナー製造用分級装置
JPH11138103A (ja) * 1997-11-06 1999-05-25 Nippon Pneumatic Mfg Co Ltd 気流分級機
JP2000157933A (ja) * 1998-11-25 2000-06-13 Tomoegawa Paper Co Ltd 分級機および整流装置

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JPH01207152A (ja) * 1988-02-12 1989-08-21 Canon Inc 気流分級機
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JPH0857424A (ja) * 1995-08-24 1996-03-05 Nippon Pneumatic Mfg Co Ltd 気流分級機における原料供給装置
JPH09108631A (ja) * 1995-10-17 1997-04-28 Canon Inc トナー製造用分級装置
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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010149090A (ja) * 2008-12-26 2010-07-08 Nippon Pneumatic Mfg Co Ltd 気流分級機
CN102416382A (zh) * 2010-08-26 2012-04-18 株式会社理光 分级装置、分级方法、调色剂和制造所述调色剂的方法
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CN103781560A (zh) * 2011-09-14 2014-05-07 曼格特奥克斯国际有限公司 粒状物料分离器
JPWO2015194529A1 (ja) * 2014-06-16 2017-04-20 綜研化学株式会社 サイクロン型粉体分級装置
US10201836B2 (en) * 2015-01-16 2019-02-12 Nisshin Seifun Group Inc. Powder classifying apparatus
JP2017159215A (ja) * 2016-03-08 2017-09-14 株式会社栗本鐵工所 分級機能付粉砕装置
CN110694903A (zh) * 2018-07-09 2020-01-17 福建南方路面机械有限公司 细石粉分离设备及其使用方法
CN110694903B (zh) * 2018-07-09 2024-03-01 福建南方路面机械股份有限公司 细石粉分离设备及其使用方法

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