JP2005111357A - Grinder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a grinder allowing high-latitude adjustment of the centrifugal force and shear rate to be applied to a medium. <P>SOLUTION: The crusher has a grinding chamber 3 for a material to be processed formed within it, a cylindrical grinding tank 2 arranged in a rotatable way, a rotating shaft 23 of the tank 2, a rotor 30 arranged within the chamber 3 in such a way as to rotate coaxially with the shaft 23 and a rotating shaft 22 of the rotor 30. The rotating directions of the shafts 22 and 23 are set so that the tank 2 and the rotor 30 rotate in the same direction. The rotation of the tank 2 and the rotor 30 in the same direction leads to application of a centrifugal force to the medium filled in the chamber 3 through rotation of the tank 2. The centrifugal force applied to the medium can be set freely by adjusting the rotating speed of the tank 2 and the rotor 30. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a pulverizer, and more particularly to a media stirring type wet pulverizer used for pulverization and dispersion in a manufacturing process of ink, paint, ceramics and the like.

  A media agitation type wet pulverizer used for pulverization and dispersion in the manufacturing process of ink, paint, ceramics, etc., is used by immersing it in a suspension of processed material stored in a processing tank, The processed material circulates in the processing tank and the pulverizer and flows, and when it passes through the pulverizer, it is agitated with the media and repeatedly subjected to pulverization and dispersion treatment, and the entire processed material in the processing tank is gradually processed. The

  Such a pulverizer is used for pulverizing very fine solids, and the target particle size is on the order of micron or submicron. In such fine pulverization, the smaller the media to be used, the better the pulverization efficiency. Recently, media having a diameter of 1 mm or less are often used.

  As an example of such a type of pulverizer, a pulverization tank having a treatment product inlet at the upper end and a treatment product outlet at the lower end, a separator provided at the pulverization tank outlet, and the center of the pulverization tank (For example, an axial flow pump provided below the pulverization tank is disclosed (for example, an agitation arm provided in a portion of the rotation shaft located in the pulverization tank) (See Patent Document 1).

  In this pulverizer, when the rotating shaft is rotated, the processed material in the processing tank flows into the pulverizing tank from the inlet, and is stirred together with the media by the stirring arm, and separated from the media by the separator, and then the pulverizing tank. It flows out. And by repeating such a thing, a processed material is grind | pulverized to the particle diameter of a micron order or a submicron order.

  Further, as another example of the pulverizer, a substantially cylindrical pulverization tank in which a processing product pulverization chamber is formed, a rotary shaft that passes through the center of the pulverization tank, and a rotary shaft located in the pulverization tank. The thing provided with the rotor for stirring provided in a part is disclosed (for example, refer patent document 2).

  In this case, the pulverization tank includes a cylindrical separator having a plurality of gaps communicating in the radial direction inside and outside the pulverization chamber, an upper plate that closes the upper end opening of the separator, and a lower plate that closes the lower end opening of the separator. A suction port for a processed material that communicates the outside of the grinding chamber in the axial direction is provided in a part of at least one of the upper plate and the lower plate.

  In this pulverizer, when the rotor is rotated integrally with the rotary shaft, the processed material in the processing tank is sucked into the pulverization chamber from the suction port of the pulverization tank by the centrifugal force of the rotor, and is stirred together with the media in the pulverization chamber. It is pulverized and guided in the direction of the separator by centrifugal force and flows out of the pulverization chamber through a plurality of gaps in the separator. And by repeating such a thing, a processed material will be grind | pulverized to the particle diameter of a micron order or a submicron order.

  In the pulverizer configured as described above, the processed product is pulverized and dispersed by the shearing action between the media. The shearing force is considered to be approximately proportional to the centrifugal force generated by the rotation of the rotor (arm) and the shearing speed generated between the rotor and the tank wall surface. Therefore, in order to efficiently perform the pulverization and dispersion treatment, it seems to be advantageous to increase the centrifugal force and the shear rate by increasing the rotation of the rotor.

  However, even if the rotation of the rotor is actually increased, the crushing ability is not improved so much, and only the power necessary for the rotation of the rotor is increased, resulting in a decrease in energy efficiency (crushing ability / power). Furthermore, the faster the rotor rotates, the more wear of the members and media in the grinding chamber becomes.

This means that there is an optimal combination between centrifugal force and shear rate in order to increase the crushing ability. If this relationship is not desirable, the movement of the media becomes wasteful and energy efficient. Is considered to decrease, and the amount of wear increases. Considering the above two pulverizers from this point of view, the centrifugal force and the shear rate can be changed to some extent depending on the shape of the rotor (arm) and the like, but there is a limit. It is.
Japanese Utility Model Publication No. 6-57431 JP-A-11-104508

  The present invention provides a media agitation type pulverizer capable of adjusting a centrifugal force and a shear rate applied to a medium with a high degree of freedom, and having high energy efficiency and low wear even when the rotor is rotated at a high speed. It is intended.

  In order to solve the above-described problems, a pulverizer according to claim 1 of the present invention is a media agitation type pulverizer for pulverizing a processed product stored in a processing tank. A crushing chamber is formed, and a substantially cylindrical cylindrical crushing tank provided rotatably with respect to an axis, a rotation axis of the crushing tank, and a rotation provided with the axis aligned with the crushing chamber And a means for rotating the crushing tank and the rotor in the same direction.

  Further, the pulverizer according to claim 2 of the present invention is the pulverizer according to claim 1, wherein the pulverization tank has a cylindrical separator having a plurality of gaps communicating radially outside the pulverization chamber; An upper plate that closes the upper end opening of the separator, and a lower plate that closes the lower end opening of the separator, and a part of at least one of the upper plate and the lower plate, A means provided with a suction port for the processed material to be communicated is employed.

  Furthermore, the pulverizer according to claim 3 of the present invention is the pulverizer according to claim 2, wherein the suction port is formed by a suction pipe attached to the axial center portion of the lower plate toward the pulverization chamber. Adopted means.

  Furthermore, the pulverizer according to claim 4 of the present invention is the pulverizer according to claim 2 or 3, wherein means comprising stirring blades outside the separator and / or below the lower plate are employed. Yes.

  Furthermore, a pulverizer according to a fifth aspect of the present invention is the pulverizer according to any one of the first to fourth aspects, wherein the rotor includes a rotating plate and a plurality of pins fixed to the rotating plate. Adopted.

  Further, the pulverizer according to claim 6 of the present invention employs means in which the plurality of pins are provided on both the upper and lower surfaces of the rotating plate in the pulverizer according to claim 5.

  Furthermore, the pulverizer according to claim 7 of the present invention is the pulverizer according to claim 5 or 6, wherein at least one of the upper plate and the lower plate of the pulverization tank is separated from the axis of the rotor pin. A means having a plurality of pins at different positions is employed.

  Since the pulverizer according to the present invention is configured to rotate the pulverization tank in the same direction as the rotation of the rotor, the centrifugal force is given to the medium by the rotation of the pulverization tank, and the value of the centrifugal force is changed by changing the rotation speed. Can be adjusted freely. Further, the difference between the rotational speeds of the pulverization tank and the rotor is the rotational speed at which the media is actually stirred, and the shear rate is substantially proportional to this value, so that the shear rate can be freely adjusted. Therefore, the amount of centrifugal force and the shear rate can be selected so as to be in an optimal combination, and pulverization can be performed under the optimum conditions. Therefore, pulverization with high energy efficiency and low wear is possible. Processing can be performed.

  Further, the pulverizer according to the present invention can be provided with a stirring blade in a rotating pulverization tank, which can uniformly stir the processed product in the processing tank. On the other hand, it can stir uniformly, without producing starch. Furthermore, the amount of processed material flowing through the pulverizing tank can be increased by the pumping action caused by the rotation of the pulverizing tank. Therefore, even if the gap between the separators is reduced because a medium having a small diameter is used, The amount of circulation can be made sufficiently large.

The pulverizer of the present invention will be described below with reference to the drawings.
1 to 4 show an embodiment of a pulverizer 1 according to the present invention. FIG. 1 is an explanatory view showing an example incorporated in a pulverizer, FIG. 2 is a longitudinal sectional view of the pulverizer, 3 is a cross-sectional view of the pulverizer, and FIG. 4 is a partially enlarged cross-sectional view of FIG.

  That is, the crusher 40 shown in FIG. 1 includes a base 41, a support column 42 that stands vertically on the top of the base 41, and a support beam that is vertically movable at the upper end of the support column 42. 43, the pulverizer 1 according to the present invention suspended from one end of the support beam 43, and the drive source 27 of the pulverizer 1 provided at the other end of the support beam 43.

  The crusher 1 has a crushing tank 2 and a rotor 30 that can be rotated independently, and the crushing tank 2 and the rotor 30 are connected to a drive source 27 via power transmission means (not shown) such as a belt. Has been. The drive source 27 has two electric motors 27, the pulverization tank 2 is connected to one electric motor 27 via power transmission means, and the rotor 30 is connected to the other electric motor 27 via power transmission means. The crushing tank 2 and the rotor 30 are driven to rotate independently by driving 27.

  An air cylinder (not shown) is incorporated in the column 42. The air cylinder is connected to the air tank 28 via a pipe (not shown), and the support beam 43 is driven in the vertical direction by supplying air from the air tank 28 to the air cylinder via the pipe. Has been.

  In the pulverization apparatus 40 having the above-described configuration, a plurality of processing tanks 44 in which the processed products 45 are stored in advance are prepared, and the pulverizer 1 is moved in the vertical direction via the support beams 43 to sequentially process tanks. By pulverizing the processed material 45 in each processing tank 44 while replacing 44, the pulverizing processing for each processing tank 44 can be performed continuously. In addition, when it becomes necessary to clean the inside and outside of the pulverizer 1 after the pulverization processing for the plurality of processing tanks 44 is finished, a cleaning liquid is put into one of the processing tanks 44 and the same as in the normal pulverization processing. By driving the pulverizer 1, the inside and outside of the pulverizer 1 can be cleaned.

  As shown in FIGS. 2 and 3, the pulverizer 1 according to the present invention includes a substantially cylindrical pulverization tank 2 in which a pulverization chamber 3 for processed material is formed and a pulverization tank 2. The crushing chamber 3 is provided with a rotor 30 rotatably provided with the axes aligned with each other, a rotating shaft 23 of the crushing tank 2, and a rotating shaft 22 of the rotor 30. The rotating shaft 23 of the crushing tank 2 has a cylindrical shape, and the rotating shaft 22 that forms the round bar shape of the rotor 30 is rotatably inserted into the rotating shaft 23 with the axis line aligned. .

  The crushing tank 2 includes a cylindrical separator 4, a disk-like upper plate 10 that closes the upper end opening of the separator 4, and a disk-like lower plate 15 that closes the lower end opening of the separator 4. In the portion surrounded by the separator 4, the upper plate 10, and the lower plate 15, a pulverization chamber 3 for processed material is formed.

  The separator 4 overlaps a plurality of annular ring-shaped plates 5 in the vertical direction, and annular distance pieces 6 at a plurality of locations (eight locations in this embodiment) between the adjacent ring-shaped plates 5 and 5. A gap 7 corresponding to the thickness of the distance piece 6 is formed between the adjacent ring-shaped plates 5 and 5, and the inside and outside of the separator 4 communicate with each other in the radial direction via the gap 7. Is configured to do.

  In this case, the plurality of ring-shaped plates 5 are provided in a state in which they are inscribed inside the plurality of bolts 8, and each bolt 8 inserted through the center of each distance piece 6 is connected to the lower plate 15 and the support ring 9. The gap 7 is held between adjacent ring-shaped plates 5 and 5 by tightening with a predetermined torque.

  As shown in FIG. 4, each ring-shaped plate 5 is formed in a substantially triangular cross section so that the outer peripheral side is thin. Thus, by inclining the ring-shaped plate 5, Since the outer peripheral side can be formed wider than the inner peripheral side, the outflow of the processed material can be made smooth.

  The upper plate 10 has a disc shape having a through-hole through which the rotation shaft 22 of the rotor 30 is inserted in the center, and is bolted to the lower surface side of the support plate 24 provided at the lower end portion of the rotation shaft 23 described later. 11 is fixed.

  On the lower surface side of the upper plate 10, a disk-like upper array plate 12 having a through hole through which the rotation shaft 22 of the rotor 30 is inserted is fixed at the center via bolts 13. A plurality of fixing pins 14 projecting downward in the vertical direction are integrally provided.

  The lower plate 15 has a disk shape having a through hole at the center, and a disk-shaped lower array plate 16 having a through hole at the center is provided on the upper surface side of the lower plate 15 with bolts 17. The lower array plate 16 is integrally provided with a plurality of fixing pins 18 protruding upward in the vertical direction.

  A cylindrical suction pipe 19 is inserted into the center of the pulverization tank 2, and the suction pipe 19 constitutes a suction port for supplying a processed material into the pulverization chamber 3. The suction pipe 19 is inserted through the through hole of the lower plate 15, the through hole of the lower array plate 16, the crushing chamber 3, the through hole of the upper array plate 12 and the through hole of the upper plate 10. Is located inside the lower end of the rotating shaft 22. The suction pipe 19 is fixed to the center portion of the pulverization tank 2 by fixing a flange portion 20 provided at the lower end portion to the lower plate 15 with a bolt 21.

  The rotating shaft 23 has a cylindrical shape, and a disk-shaped support plate 24 is integrally fixed to the lower end portion by welding or the like, and the grinding tank 2 is integrally fixed to the lower surface side of the support plate 24. Yes. In this case, the crushing tank 2 is integrally fixed to the rotating shaft 23 by connecting the upper plate 10 to the support plate 24 by the bolt 11 and connecting the support ring 9 to the support plate 24 by the bolt 29. Therefore, when the inside of the crushing tank 2 is inspected, the upper plate 10 and the upper array plate 12 are attached to the rotary shaft 23 side by loosening and removing the bolts 29 connecting the support ring 9 to the support plate 24. Since the rotating shaft 23 and the other part of the crushing tank 2 can be separated from each other in the remaining state, the inside of the crushing tank 2 and the rotor 30 can be inspected. Note that an opening 25 is provided in a part of the rotating shaft 23 for feeding the medium into the crushing chamber 3, and the opening 25 is closed by a lid 26.

  The rotor 30 includes a disc-shaped rotating plate 31 having a through-hole at the center, a cylindrical connecting member 33 projecting upward provided integrally with a peripheral portion of the through-hole at the center of the rotating plate 31, and a rotor. The plate 31 includes a plurality of rotation pins 35 that are integrally provided on the upper surface and the lower surface of the plate 31 and protrude upward or downward in the vertical direction. The rotor 30 is integrally connected to the lower end portion of the rotating shaft 22 by fitting the lower end portion of the rotating shaft 22 to the inner peripheral side of the upper end portion of the connecting member 33 and fixing it with a bolt (not shown). .

  As shown in FIG. 3, the rotary plate 31 is provided with oval-shaped communication holes 32 communicating between the upper and lower surfaces at a plurality of locations at predetermined intervals in the circumferential direction. The workpieces are configured to circulate between the upper and lower surfaces of the rotating plate 31. The upper end portion of the connection member 33 is provided with a plurality of communication holes 34 communicating between the inner and outer surfaces, and the workpieces are configured to communicate with each other between the inner and outer surfaces of the connection member 33 via the communication holes 34. Has been.

  The suction pipe 19 provided at the center of the pulverization tank 2 is inserted into the connection member 33 from below, and a predetermined gap is formed between the outer peripheral surface and the front end face of the suction pipe 19 and the inner surface of the connection member 33. 36 is formed. The lower end portion of the gap 36 communicates with the crushing chamber 3 on the lower surface side of the rotary plate 31 through the through hole of the rotary plate 31, and the upper end portion of the gap 36 rotates through the communication hole 34 of the connection member 33. The gap 37 between the outer surface of the shaft 22 and the inner surface of the rotary shaft 23 communicates with the crush on the upper surface side of the rotary plate 31 through the through hole of the upper plate 10 and the through hole of the upper array plate 12. It communicates with chamber 3.

  Part of the processed material sucked through the suction pipe 19 flows into the crushing chamber 3 below the rotating plate 31 through the gap 36 between the suction pipe 19 and the connection member 33. The other part of the processed material flows from the gap 36 between the suction pipe 19 and the connection member 33 into the gap 37 between the rotation shaft 22 and the rotation shaft 23 through the communication hole 34 of the connection member 33. It flows into the crushing chamber 3 on the upper side of the rotating plate 31 through the gap 37. It should be noted that the opening 25 of the rotating shaft 23 can also be used as an inlet for a processed material.

  In order to agitate the processed material 45 stored in the processing tank 44, a stirring blade may be provided in the pulverization tank 2. For example, as indicated by an imaginary line in FIG. 2, the peripheral wall portion of the processing tank 44 can be agitated by fixing the agitating blade 38 provided with a blade outside the cylindrical member to the support ring 9. Further, the bottom of the processing tank 44 can be stirred by providing the stirring blade 39 on the lower side of the lower plate 15.

  By making these stirring blades 38 and 39 removable, the necessary shape and size are selected according to the properties (viscosity, sedimentation properties, etc.) of the processed material, and the processed material is stirred under the optimum conditions. Can do.

  Then, the drive source 27 of the crusher 1 configured as described above is driven to rotate the crushing tank 2 via the power transmission member and the rotary shaft 23, and the rotor 30 via the power transmission member and the rotary shaft 22. Is rotated in the same direction as the pulverization tank 2, and the processed material 45 is sucked into the pulverization chamber 3 on the lower surface side and the pulverization chamber 3 on the upper surface side of the rotating plate 31 through the suction pipe 19, thereby The processed material 45 and the media 46 are stirred and pulverized together. The pulverized processed product 45 is separated from the medium 46 by the separator 4 and flows out of the pulverization chamber 3 through the gap 7. And by repeating such a thing, the processed material 45 is formed in a predetermined particle diameter.

  In this case, since the crushing tank 2 and the rotor 30 rotate in the same direction, the media 46 filled in the crushing chamber 3 is given a centrifugal force by the rotation of the crushing tank 2, and the number of rotations thereof. It is possible to set an arbitrary magnitude of centrifugal force by adjusting.

  Further, the medium 46 filled in the pulverizing chamber 3 is stirred by the rotor 30, and the rotational speed of this stirring is the difference between the rotational speed of the rotor 30 and the rotational speed of the pulverizing tank 2. The shear rate generated by stirring can be set to an arbitrary value by adjusting both rotation speeds.

  Accordingly, it is possible to freely adjust the centrifugal force and the shear rate acting on the medium 46, and by setting these combinations to optimum conditions, a pulverization process with high energy efficiency and low wear is performed. It becomes possible.

  Further, the centrifugal force generated by the rotation of the grinding tank 2 is given to the entire medium 46 filled. Further, with respect to the shear rate due to the rotation of the rotor 30, a shear rate corresponding to the above difference in the number of rotations can be obtained between the individual rotation pins 35 and the individual fixing pins 14 and 18. This effectively acts on the entire media 46.

  As noted above, these centrifugal forces and shear rates will occur approximately uniformly throughout the filled media 46, and as a result, the shear forces required for crushing will also occur across the filled media 46. Will be obtained. Therefore, even when the difference in the rotational speed is relatively small, a large crushing ability can be obtained, and a crushing process with high energy efficiency and a small amount of wear can be performed.

  Furthermore, since the pulverization tank 2 includes the stirring blades 38 and 39, the processed product 45 stored in the processing tank 44 can be uniformly stirred by rotating the pulverization tank 2. In particular, this is effective when processing a processed product 45 having a high viscosity. That is, the peripheral wall portion of the processing tank 44 can be stirred by the stirring blade 38 provided on the side surface of the pulverization tank 2, and the processing tank 44 is provided by the stirring blade 39 provided below the processing tank 44. It becomes possible to stir the bottom part of the. Therefore, even if the processed product 45 has a high viscosity, a uniform state can be maintained without causing stagnation in the processing tank 44.

  Furthermore, since the processed product 45 in the crushing chamber 3 receives a centrifugal force by the rotation of the crushing tank 2, the circulation amount of the processed product 45 increases between the processing tank 44 and the crushing chamber 3. In order to efficiently pulverize and disperse fine solids, it is preferable to use a small medium 46. However, the smaller the medium 46 is, the narrower the gap 7 of the separator 4 is. However, there is a problem that the circulation amount is insufficient. In the present invention, even when the gap 7 of the separator 4 is reduced, the circulation amount of the processed product 45 can be sufficiently increased by the centrifugal force generated by the rotation of the pulverization tank 2.

(Crushing test)
The test which processes the slurry which suspended calcium carbonate on the following conditions was done using the grinder shown in FIGS.
Processing tank: inner diameter 450mm, height 600mm
Processed product: Water 50kg
Calcium carbonate (d50 = 5.5μm) 50kg
Dispersant (Toa Gosei, Aron A6004) 0.1kg
Crushing chamber: Inner diameter 180mm, Height 80mm
Media: Diameter 0.5mm, filling amount 3.8kg
Number of revolutions: grinding tank 201rpm
Rotor 1015rpm
When the target particle size for pulverization was d50 = 2.0 μm, the arrival time was 29 minutes, and the pulverization ability capable of treating 0.454 kg of calcium carbonate per 1 kg of media per minute was confirmed.

For comparison, a conventional pulverizer was used to perform a test under the following conditions. As a result, the above pulverization capacity was 0.237 kg. Therefore, it was confirmed that the pulverizer of the present invention has a pulverization capacity 1.92 times that of the conventional pulverizer.
Processing tank: inner diameter 450mm, height 600mm
Processed product: Water 50kg
Calcium carbonate (d50 = 5.5μm) 50kg
Dispersant (Toa Gosei, Aron A6004) 0.1kg
Crushing chamber: inner diameter 230mm, height 86mm
Media: Diameter 0.5mm, Filling 8.1kg
Rotation speed: Rotor 1200rpm

(Abrasion test)
Using the pulverizer shown in FIGS. 1 to 4, a slurry in which alumina was suspended was treated under the following conditions, and a test for measuring the amount of abrasion of the separator was performed.
Processing tank: inner diameter 450mm, height 600mm
Processed product: Water 45kg
Alumina (d50 = 0.9μm) 5kg
Crushing chamber: Inner diameter 180mm, Height 80mm
Media: Diameter 0.8mm, filling amount 3.7kg
Rotation speed: Crush tank 469rpm
Rotor 912rpm
When the target particle size for pulverization was d50 = 0.38 μm, the arrival time was 12 hours, and the amount of wear of the separator was confirmed to be 0.017% by mass per hour.

For comparison, a conventional pulverizer was used and the test was performed under the following conditions so that the pulverization ability was almost equal. As a result, the arrival time was 8 hours, and the amount of wear of the separator was 1 hour. It was 0.155 mass%. Therefore, in the pulverizer of the present invention, it was confirmed that the amount of wear of the separator was about 1/9 that of the conventional pulverizer.
Processing tank: inner diameter 450mm, height 600mm
Processed product: 45kg of water
Alumina (d50 = 0.9μm) 5kg
Crushing chamber: inner diameter 230mm, height 86mm
Media: Diameter 0.8mm, Filling amount 6.57kg
Rotation speed: Rotor 1200rpm

It is the whole figure which showed an example of the crushing apparatus using the crusher by this invention. It is the longitudinal cross-sectional view which showed one Embodiment of the grinder by this invention. It is a cross-sectional view of the pulverizer shown in FIG. FIG. 4 is a partially enlarged sectional view of FIG. 3.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Crusher 2 Crushing tank 3 Crushing chamber 4 Separator 5 Ring-shaped plate 6 Distance piece 7 Gap 8, 11, 13, 17, 21, 29 Bolt 9 Support ring 10 Upper plate 12 Upper array plate 14, 18 Fixed pin 15 Lower plate 16 Lower arrangement plate 19 Suction pipe 20 Flange portion 22, 23 Rotating shaft 24 Support plate 25 Opening portion 26 Lid 27 Drive source 28 Air tank 30 Rotor 31 Rotating plate 32, 34 Communication hole 33 Connection member 35 Rotating pin 36, 37 Gap 38 39 Stirrer blade 40 Crushing device 41 Base 42 Support column 43 Support beam 44 Processing tank 45 Processed object 46 Media

Claims (7)

  A media agitation type pulverizer for pulverizing a processed material stored in a processing tank, wherein a pulverizing chamber for the processed material is formed therein, and a substantially bowl-shaped cylindrical shape provided rotatably with respect to an axis. A crushing tank, a rotation axis of the crushing tank, a rotor rotatably provided in the crushing chamber with the axis line aligned, and a rotation axis of the rotor, wherein the crushing tank and the rotor are in the same direction A pulverizer characterized in that it rotates in a straight line.   The pulverization tank has a cylindrical separator having a plurality of gaps communicating with the outside of the pulverization chamber in the radial direction, an upper plate closing the upper end opening of the separator, and a lower plate closing the lower end opening of the separator 2. A pulverizer according to claim 1, wherein a suction port for a processed material communicating with the outside of the pulverization chamber is provided in a part of at least one of the upper plate and the lower plate.   The pulverizer according to claim 2, wherein the suction port is formed by a suction pipe attached to an axial center portion of the lower plate toward the pulverization chamber.   The grinder of Claim 2 or 3 provided with the stirring blade on the outer side of the said separator and / or the lower side of the said lower board.   The pulverizer according to any one of claims 1 to 4, wherein the rotor includes a rotating plate and a plurality of pins fixed to the rotating plate.   The crusher according to claim 5, wherein the plurality of pins are provided on both upper and lower surfaces of the rotating plate.   The pulverizer according to claim 5 or 6, wherein at least one of the upper plate and the lower plate of the pulverization tank includes a plurality of pins at positions where the distance from the axis is different from the pins of the rotor.

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