JP4836026B2 - Powder reformer - Google Patents

Description

  The present invention relates to an apparatus for modifying the surface of a powder, particularly to a spheroidizing apparatus or a composite processing apparatus, and more particularly to an apparatus for efficiently producing a spheroidized powder or a composite powder.

Conventionally, the raw material powder has been refined and spheroidized for the purpose of improving the bulk density and fluidity of the powder, and the compounding process has been performed for the purpose of improving the function and adding the function of the powder. It was. For example, a toner product manufactured by a pulverization method is spheroidized to improve fluidity, or a titanium oxide powder is fixed on the surface of a synthetic resin powder to form a composite. Representative examples of conventional apparatus used in sphering treatment or combined treatment, JP 2000-167370 Laid or JP apparatus according to 2000-167371 publication, or Sho 60-129144 Japanese or Hei There is a device described in Japanese Patent Laid-Open No. 7-24339, and a device described in Japanese Patent Laid-Open No. 2003-238135.

  As shown in FIG. 5, the basic structure of the device described in Japanese Patent Laid-Open No. 2000-167370 or Japanese Patent Laid-Open No. 2000-167371 includes a rotating cylindrical container 51, an inner piece 52 having an arcuate horizontal cross section installed therein, and The powder to be processed, which is constituted by the scraper 53 and filled in the rotating cylindrical container 51, moves along the inner wall under the action of centrifugal force as the rotating cylindrical container 51 rotates. In a wedge-shaped space formed in the gap between the inner wall and the inner piece 52, shearing force and compressive force are applied and spheroidization processing or composite processing is performed.

  As shown in FIG. 6, the basic structure of the device described in Japanese Patent Application Laid-Open No. 60-129144 or Japanese Patent Application Laid-Open No. 7-24339 is a collision ring 63 having an uneven inner wall surface, a rotating disk 61 installed inside the ring, The powder to be treated, which is constituted by the impingement blades 62 attached on the circumference of the rotating disk 61 and is supplied to the center of the rotating disk 61, rotates on the rotating disk 61 and is rotated on the rotating disk 61 by centrifugal force. In the process of moving toward the outer periphery and in the gap space between the impingement blade 62 and the impingement ring 63, the impact force and the shearing force are received, and a spheroidizing process or a composite process is performed.

  As shown in FIG. 9 or FIG. 10, the method described in Japanese Patent Application Laid-Open No. 2003-238135 uses a conventional pulverizer equipped with an impact member (71 or 74) that rotates at high speed. By making the supply port (72 and 76) a peripheral wall portion and the discharge port (73 and 77) above the rotation axis, the direction of the centrifugal force acting on the graphite particles rotating in the grinding chamber and the direction of the airflow are made to face each other. A method for spheroidizing graphite particles, characterized in that the residence time of the particles in the pulverization chamber is increased.

  In the powder processing apparatus of FIGS. 5 and 6, the place where the impact force, shearing force and compressive force act on the powder to be processed is the gap space between the inner wall of the rotating cylindrical container 51 and the inner piece 52 in the example of FIG. However, the volume that effectively acts on the powder processing is limited with respect to the internal volume of the apparatus. Moreover, when scaling up from an experimental scale apparatus to a production scale apparatus, in order to apply a shearing force and compressive force substantially equal to those of the experimental scale apparatus to the powder to be treated, the inner wall and inner piece of the rotating cylindrical container 51 are used. Therefore, the scale-up method increases the inner wall area of the rotating cylindrical container 51 in proportion to the increase in the processing amount. As a method of increasing the inner wall area, when the inner diameter of the rotating cylindrical container 51 is increased, the volume ratio that effectively acts on the powder processing with respect to the internal volume of the apparatus is further reduced, and the inner diameter of the rotating cylindrical container 51 is made equal. When the length is increased in the axial direction, it is difficult to uniformly distribute the powder in the axial direction.

  Also in the example of FIG. 6, the place that effectively acts on the powder processing is only the gap space between the inner wall of the collision ring 63 and the collision blade 62, and the volume is limited with respect to the internal volume of the apparatus. Further, when the scale is scaled up from the experimental scale apparatus to the production scale apparatus, the gap between the collision ring 63 and the collision blade 62 needs to be substantially equal in order to achieve the same impact force and shear force. The technique increases the inner surface area of the collision ring 63 in proportion to the increase in the processing amount. Therefore, as in the example of FIG. 5, when scaling up, there is a problem that the ratio of the volume effectively acting on the powder processing with respect to the internal volume of the apparatus or the uniform distribution of the powder becomes difficult.

  Japanese Unexamined Patent Publication No. 2000-167371 is an improvement measure of Japanese Unexamined Patent Publication No. 2000-167370. As shown in FIG. 7, two openings 55 are provided in the rotating cylindrical container 51, and the circulation path 54 and the protruding member 56 are provided outside the rotating cylindrical container 51. As the rotating cylindrical container 51 rotates, the powder to be treated circulates through the inner wall of the rotating cylindrical container 51 and the circulation path 54, and upstream of the gap space between the rotating cylindrical container 51 and the inner piece 52 by the action of the protruding member 56. Actively supplied. The processing efficiency is improved by promoting the circulation of the powder to be processed.

  Japanese Patent Laid-Open No. 7-24339 is an improvement measure of Japanese Patent Laid-Open No. 60-129144. As shown in FIG. 8, a dispersion pin 64 is attached near the center of the rotating disk 61 and the front cover of the impact chamber, and the powder in the impact chamber is dispersed by dispersing the powder in the impact chamber. The body concentration becomes uniform and the processing efficiency is improved.

  However, all the improvement measures are aimed at improving the processing efficiency in a place where impact force, shearing force and compressive force act by means such as promotion of circulation of the powder to be processed or equalization of the powder concentration. This is not a fundamental solution to the problem that the volume that effectively acts on powder processing is limited with respect to the apparatus volume, or the problem of difficulty in scale-up.

  9 and 10, the method disclosed in Japanese Patent Application Laid-Open No. 2003-238135 makes the direction of centrifugal force acting on the powder particles to be treated and the direction of the air flow opposite to each other, thereby reducing the residence time of the powder particles inside the pulverizer. To make it longer. However, in the case of a spheroidizing process or a composite process in which the toner particle size is as small as several microns and the number of particles is large, or when the hardness is high, such as metal powder or ceramic powder, impact, shearing, The frequency of compression is high, and, as in this apparatus, a predetermined result cannot be obtained by one-pass processing, and processing is repeated while collecting powder. There is a method to reduce the flow rate of the air flow and lengthen the residence time, but both the supply pipe, the inside of the pulverizer and the discharge pipe are air flow transport, and the powder concentration limit that can be transported (normally gas with a powder flow rate) The weight ratio with respect to the flow rate is about 200), and the required frequency of action cannot be obtained.

  Further, in the present fine pulverizer, the air classifying action works on the powder to be treated, that is, the fine powder has a shorter residence time in the fine pulverizer and is discharged first. The pulverization process is convenient, but the spheroidization process or the composite process, which is the purpose of this device, often increases in particle size as the process proceeds, and the unprocessed powder particles precede the processed powder particles. To be discharged. Therefore, after processing, it is necessary to use a classifier separately and collect untreated powder, which is extremely inefficient.

  In order to solve the above-mentioned problems, the present invention provides a hollow disk-shaped container having a rotating disk rotating at high speed around the same axis as its center, and having a plurality of rotating pins on the rotating disk, In the powder processing apparatus having a plurality of fixed pins facing the rotating pin on the inner wall of the rotating disk and having a certain gap, an opening is provided around the axis of the rotating disk, and the rotating shaft and the opening are provided. The rotating disk is coupled with a plurality of suction blades, a plurality of discharge blades are disposed on the outer peripheral edge of the back surface of the rotating disk having the opening, and the rotating shaft is disposed on the front and back surfaces of the rotating disk having the opening. A plurality of rotating pins are provided at substantially equal intervals on a plurality of concentric circles having substantially equal intervals around the axis, and a predetermined gap is provided on the inner surface and inner back surface of the hollow disk-shaped container so as to face the rotating pins. A plurality of fixing pins, and a rotation having the opening. By rotating the disk at a high speed, due to the action of the suction blade and the discharge blade, the powder to be treated entrained in the air from the back surface to the front surface of the rotating disk having the opening is internally circulated, In the process, impact force, shear force and compressive force are generated in a wedge-shaped gap formed by the rotating pins provided on the back surface and the front surface and the fixed pins provided on the inner back surface and the inner surface of the hollow disk container. The powder processing apparatus is characterized in that it is subjected to spheroidizing or complexing. By using the above apparatus, a volume of 70 to 90% of the internal volume of the apparatus effectively acts on the powder processing. Furthermore, in the case of scaling up from an experimental scale apparatus to a production scale apparatus, it is only necessary to increase the volume of the apparatus substantially in proportion to the increase in throughput, and the production scale apparatus becomes extremely compact. Also, the impact frequency, shear force and compression force applied to the powder to be treated due to internal circulation are greatly increased, and the spheroidizing treatment or compounding of fine powder with a particle size of several microns or high hardness is performed. Processing becomes possible.

  Further, the height of the rotary pin and the fixed pin is set so that the product of the diameter of the concentric circle on which the rotary pin or the fixed pin is installed and the height of the pin is substantially equal in all the rotary pins and the fixed pins. And the clearance between the rotating pin and the inner wall of the hollow disk-shaped container, and the fixed pin and the rotating disk surface having the opening, is 0.2 to 2.0 mm, whereby the flow rate of the air circulating inside Are substantially equal, high-efficiency powder processing is performed.

  Further, the surface side of the hollow disk-shaped container is cut into a circle with the same axis as the rotation shaft, a cylindrical classification chamber is installed there, a supply pipe in the center of the classification chamber, and a discharge port in the outer wall. By installing, while supplying the powder to be processed continuously from the supply pipe, a part of the powder to be internally circulated is discharged from the discharge port while continuously classifying the airflow, thereby achieving high efficiency. Continuous supply operation is possible.

The present invention is configured as described above, and can exhibit the following excellent effects.
(1) In the volume of 70 to 90% of the internal volume of the apparatus, there are many action points that apply impact, shear, and compressive force to the powder to be treated, and the powder to be treated is internally circulated. The number of operations of impact, shear, and compressive force is extremely large, and it is possible to provide a highly efficient and compact production apparatus that can be spheroidized or combined.
(2) The scale-up from the experimental apparatus to the production apparatus may be approximately a volume ratio, and there is no difficulty associated with the scale-up.
(3) A large amount of powder is internally circulated, and a continuous supply operation can be efficiently performed by continuously extracting a part (0.01 to 0.1 VOL% of the circulation flow rate) while classifying the powder.

  The present invention will be described in detail with reference to FIGS. 1 to 4. FIG. 1 is a front sectional view of the present invention, FIGS. 2 and 3 are arrangement examples of rotating pins and fixing pins, and FIG. 4 is a continuous supply of the present invention. It is an example of the apparatus structure in the case of implementing by. 1 has a donut-shaped rotating disk 2 that rotates by driving a rotating shaft 9. The rotating shaft 9 and the donut-shaped rotating disk 2 are sucked in as shown in FIGS. It is united via the wing 7. The donut-shaped rotating disk surface 21, the donut-shaped rotating disk back surface 22, the hollow disk container inner surface 11 and the hollow disk container inner back surface 12 are concentrically arranged as shown in FIGS. The rotating pins 3 and 4 and the fixing pins 5 and 6 are installed in a stepwise manner from the circumferential circle toward the outer circumferential circle. On the outer peripheral edge of the donut-shaped rotating disk back surface 22, a plurality of flat plate-like discharge blades are installed in the radial direction, as shown in FIGS. As shown in FIG. 1, a cylindrical classification chamber 30 is installed in the center of the hollow disk-shaped container 1, and in the center of the classification chamber 30, a supply pipe 32 extends to a position directly above the rotary shaft 9 as shown in FIG. 1. As shown in FIG. 1, a discharge port 33 is installed on the outer peripheral wall surface.

  Next, an example of powder processing will be described with reference to FIGS. The powder to be processed, which is quantitatively supplied from the supply machine 41, is sucked from the supply port 31 through the supply pipe 32 to the back side of the donut-shaped rotating disk 2. The donut-shaped rotating disk 2 rotates at a high speed, and a large amount of air circulates internally by the action of the suction blades 7 and the discharge blades 8 installed therein. The powder to be treated sucked on the back surface of the donut-shaped rotating disk 2 is also entrained in the internal circulation air, and internally circulates from the back surface side to the front surface side and from the front surface side to the back surface side of the donut-shaped rotating disk 2. In the process of passing through the back surface side, in the wedge-shaped gap between the back surface rotation pin 4 and the back surface fixing pin 6, in the process of passing through the front surface side, in the wedge-shaped gap between the surface rotation pin 3 and the surface fixing pin 5. The powder is subjected to impact force, shear force and compressive force, and is subjected to spheroidizing treatment or composite treatment.

  A large amount of the internal circulating air and a part of the internally processed powder are discharged from the exhaust port 33 through the classification chamber 30 by the exhaust fan 43 shown in FIG. 4, and the processed powder is recovered by the cyclone 42. The

  FIG. 2 shows an example in which the horizontal cross-sectional shapes of the rotary pins 3 and 4 and the fixed pins 5 and 6 are both circular. In this case, it is suitable for powder processing that applies impact force and shearing force, and powders containing pigments in resin such as toner and powder coating, inorganic powder, or metal powder refinement, spheroidization processing or Suitable for surface modification treatment such as fixing inorganic fine particles to resin powder.

  FIG. 3 shows an example in which the horizontal cross-sectional shape of the rotating pins 3 and 4 is a plate shape having the same curvature as the concentric curvature of the rotating shaft 9 on which the rotating pin is installed, and the horizontal cross-section of the fixed pin is circular. In this case, it is suitable for powder processing that applies a shearing force and a compressive force, and is suitable for flattening of metal powder, compounding of metal powder and other metal powder, compounding of metal powder and inorganic substance, or the like.

FIG. 1 is a front sectional view showing an example of a powder reforming apparatus according to the present invention.
Fig. 2 Arrangement example of cylindrical rotary pin, cylindrical fixed pin, suction blade and discharge blade.
Fig. 3 Arrangement example of flat plate rotation pin, cylindrical fixed pin, suction blade and discharge blade.
FIG. 4 is a flowchart showing an example of the apparatus configuration when the spheroidizing process or the compounding process according to the present invention is performed by continuous supply.
FIG. 5 is a basic configuration diagram of a conventional spheroidizing or composite processing apparatus.
FIG. 6 is a basic configuration diagram of another example of a conventional spheronization or composite processing apparatus.
7 is a basic configuration diagram of the apparatus in which an improvement measure is added to the apparatus shown in FIG.
8 is a basic configuration diagram of the apparatus in which an improvement measure is added to the apparatus shown in FIG.
Fig. 9 Basic configuration diagram of graphite spheroidizing treatment device Fig. 10 Basic configuration diagram of impact type member of graphite spheroidizing processing device being pin type

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hollow disk type container 11 Hollow disk type container surface 12 Hollow disk type container back surface 2 Donut-shaped rotating disk 21 Donut-shaped rotating disk surface 22 Donut-shaped rotating disk back surface 3 Surface rotating pin 4 Back surface rotating pin 5 Surface fixing pin 6 Back surface fixing pin 7 Suction blade 8 Discharge blade 9 Rotating shaft 30 classification chamber 31 Supply port 32 Supply pipe 33 Discharge port 40 Powder reformer 41 Supply device 42 Cyclone 43 Exhaust fan 51 Rotating cylindrical container 52 Inner piece 53 Scraper 54 Circulation circuit 55 opening 56 projecting member 61 rotating disk 62 collision blade 63 collision ring 64 dispersion pins 71, 74, 75 impact member 72, 76 supply port 73, 77 discharge port

Claims (6)

There is a rotating disk that rotates at a high speed with the same axis as the center in the hollow disk-shaped container, and has a plurality of rotating pins on the rotating disk, facing the rotating pin on the inner wall of the hollow disk-shaped container, In a powder processing apparatus having a plurality of fixing pins having gaps, an opening is provided around the axis of the rotating disk, and the rotating shaft and the rotating disk having the opening are coupled by a plurality of suction blades. A plurality of discharge vanes are disposed on the outer peripheral edge of the back surface of the rotating disk having the opening, and a plurality of equidistant intervals around the axis of the rotating shaft are provided on the front and back surfaces of the rotating disk having the opening A plurality of rotating pins are provided on the concentric circles at equal intervals , and a plurality of fixing pins that are opposed to the rotating pins and have a certain gap are provided on the inner surface and the inner back surface of the hollow disk-shaped container, and the openings are provided. When the rotating disk rotates at high speed, Due to the action of the blades and the discharge blades, the powder to be treated entrained in the air is internally circulated from the back surface to the front surface and from the front surface to the back surface of the rotating disk having the opening. In a wedge-shaped gap formed by the rotating pin and the fixed pins provided on the inner and rear surfaces and the inner surface of the hollow disk-shaped container, the impact force, shearing force and compressive force are received, and a spheroidizing process or a compounding process is performed. powder reformer, characterized in that it is. The height of the rotating pin and the fixing pin is a height at which the product of the diameter of the concentric circle on which the rotating pin or the fixing pin is installed and the height of the pin is equal in all the rotating pins and the fixing pins. Further, by setting the clearance between the rotating pin and the inner wall of the hollow disk-shaped container, and the fixed pin and the rotating disk surface having the opening to be 0.2 to 2.0 mm, the flow velocity of the air circulating inside becomes equal . The powder reforming apparatus according to claim 1, wherein: The surface side of the hollow disk-shaped container is cut out in a circle with the same axis as the rotation axis, a cylindrical classification chamber is installed there, a supply pipe is installed in the center of the classification chamber, and a discharge port is installed in the outer wall The powder reforming apparatus according to claim 1 . The powder reforming apparatus according to any one of claims 1 to 3, wherein a gap between the rotating pin and the fixed pin is 0.2 to 2 mm . The powder reforming apparatus according to any one of claims 1 to 4, wherein the horizontal cross-sectional shapes of the rotating pin and the fixing pin are both circular . The horizontal sectional shape of the rotation pin and the fixed pins, one by one circular, the other, in any one of claims 1 to 4, characterized in that a plate-like shape having an arc of greater curve than the circular The powder modifying apparatus as described.

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