EP1219353A1

EP1219353A1 - Grinding and classifying method for cereals and grinding and classifying machine for cereals

Info

Publication number: EP1219353A1
Application number: EP00956988A
Authority: EP
Inventors: Tadashi Ninomiya; Shujiro Shiraiwa; Hiroaki Kanazawa
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-09-08
Filing date: 2000-09-06
Publication date: 2002-07-03
Also published as: CN1387463A; AU6873200A; KR100720286B1; WO2001017684A1; JP2002028511A; CA2384343A1; CN1180887C; JP4467157B2; KR20020038748A

Abstract

The present invention is related to a method for pulverizing and classifying which can get a desired particle size of a stamping in a short time. Air flow is produced and directed to a pulverization zone from a classification zone, each of the blades provided into the pulverization and classification zones is rotated at high-sped, and then the materials sent into the pulverization zone collides with the blade for churning-pulverizing and is pulverized with churning by a centrifugal air current produced by the blade. After that, the detailed stamping is sent into the classification zone with riding the spiral air current A. In the classification zone, the coarse stamping flows back to the pulverization zone along with the inclined inner circumferential surface by the centrifugal air current produced by the rotation of the blade for churning-classifying, and the stamping have a size smaller than the desired particle size is only taken out to the classification zone with the spiral air current.

Description

The present invention is related to a device and method for pulverizing and classifying which do pulverization processing for a desired particle size of a stamping including cereals such as a soybean and rice, shells, and ores.

BACKGROUND OF THE INVENTION

In order to grind cereals and ores, various pulverization technologies is developed from the former and it is especially indicated by the Japanese Patent Publication No. Hei7-83840 as a device enabled it to obtain fine powder, for example.
In the grinder indicated by gazette, the first and second revolution bodies which are supported by the rotating axle face each other and are provided in casing which prepared the injection mouth of materials in the one side, and constitutes the pulverization room is installed between a pair of these revolution bodies, and the composition room of casing.
Then, the materials passage intervals for materials such as through hole which connects this pulverization room and the injection mouth is provided in the first revolution body, the through hole is provided in the second revolution body along with the rotating axle. In addition, they are connected to the opening for discharging having the through hole and absorber.
When the revolution body is rotated through the axle, revolution movement of the materials supplied to the pulverization room through the materials passage interval will be carried out, and then centrifugal force acts on the materials is pushed in the outer direction by the centrifugal force, friction pulverization is mutually carried out with pickpocket. After that, the material is added suction effect by working the suction device installed with the side of the outlet. The fine powder which receives a suction effect strongly by effect of centrifugal force is taken out from the outlet.
In the grinder indicated by the Japanese Patent Publication No. Hei7-83840, using as it separates from the first or second revolution bodies, the revolution speed of the particle in the pulverization room charge, the particles of materials is rubbed each other, and is performing friction pulverization.
Therefore, in the beginning when materials were fed into the grinder, since the surface area that it wears for each other, as an adjoining particle is also small when materials are big lumps, there is a problem that pulverization takes time.
Moreover, in order to attract the particle ground from the through hole provided in the second revolution body with suction equipment and to take out to the outlet, the ground materials adhered to the circumference of the through hole, the opening area of the through hole became narrow for a short time, and there was a fault that efficiency of a grinder cannot fall, or the through hole is closed for a short time and became unable to grind further.
In light of the foregoing, it is an object of the present invention to provide a device and method for pulverizing and classifying a stamping including serials and the like which can prevent to stop pulverizing with closing the path by the stamping in a short time. It is another object of the present invention to provide a device and method for pulverizing and classifying which can pulverize and classify to the desired size of the stamping. It is a further object of the present invention to provide the device and method for pulverizing and classifying that it has a simple structure. It is a still further object of the present invention to provide the device and method for pulverizing and classifying which it is easy to maintain.
The novel features which are believed to be characteristic of the invention, both as to its organization and method of operation, together with further objects and advantages thereof, are described below with reference to the accompanying drawings in which a presently preferred embodiment of the invention is illustrated as an example.
It is to be expressly understood, however, that the drawings are for the purpose of illustration and description only, and are not intended as a definition of the limits of the invention.

Disclosure of the Invention

A method for pulverizing and classifying of cereals includes spiral air current generating process producing the air flow which pass through, directed to a classification zone from a pulverization zone, inside of the classification zone surrounded by an inner circumferential surface in the shape of a truncated cone, the inner circumferential surface having a smaller diameter end to the downstream direction and provided at the downstream part of the pulverization zone surrounded by an inner circumferential surface formed in the shape of a cylinder, and in the pulverization zone, a blade for churning-pulverizing provided at an axle into the pulverization zone has spiral air current directed to the classification zone while the current is circling in near a center portion of the pulverization zone; pulverization process, the stamping sent into the pulverization zone from the upstream part thereof strikes the blade for churning and pulverizing by blowing the air current and pulverized, and In the circumferential part of the pulverization zone, the centrifugal air current directed to the radius direction and outside thereof is produced, it grinds more minutely using the churning action by the centrifugal air current, it puts on the spiral air current one by one from the pulverization thing which become detailed, and sends into the classification zone; extraction process, the stamping carried from the pulverization zone by high-rotation of the blade around the central axis is divided into the stamping having large and small mass, and the stamping having large mass moves to the inner circumferential surface side having the truncated cone shape while it is pulverized by the centrifugal air current produced by the blade and is returned back, on the other hand, the stamping having small mass gets in the spiral air current produced around the central part of the classification zone to the direction and can be taken it out to the downstream thereof; and adjustment process for the particle size, being adjusted the particle size of the pulverized stamping taken out from the classification zone by fluctuating selectively the number of rotation of the blade or the air current flow which makes it pass towards the classification zone from the pulverization zone.
In addition, a device for pulverizing and classifying comprises a pulverization chamber further including a pulverization case having a pulverization room formed in the shape of a cylinder, and a classification case having a side case with an injection mouth provided at a portion adjacent an upstream of the pulverization case and a classification room, formed in the shape of a truncated cone, having an extraction mouth in the direction of an axis, the mouth extending from a large diameter end connected to the downstream portion of the pulverization case to a small diameter end connected to a suction duct; an axle attached rotatably in the side case so that it rotates to the circumference of axle of the pulverization chamber, the axle driving by a power source provided at the outside of the of the pulverization chamber; at least one churning-pulverizing rotor having a plurality of blades for churning and pulverizing, formed in the direction of radiation, the blade churning and pulverizing the stamping supplied from the injection mouth of the side case in the pulverization room; and a churning-classifying rotor having a plurality of blades for churning and classifying in the direction of radiation, the blades approaching and countering the inner circumferential surface, formed in the shape of the truncated cone and has a tip portion which is inclined so that it is provided along the inner circumferential surface respectively.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a flow diagram showing a first embodiment of the present invention;
Fig. 2 is a front view, partly in cross section showing the first embodiment of the present invention;
Fig. 3 is an expanded sectional view of main part showing the first embodiment of the present invention;
Fig. 4 is a sectional view taken along the line 4 - 4 of Fig. 3;
Fig. 5 is a sectional view taken along the line 5 - 5 of Fig. 3;
Fig. 6 is an explanation view of a churning-pulverizing rotor of the first embodiment of the present invention;
Fig. 7 is a sectional view taken along the line 7 - 7 of Fig. 6;
Fig. 8 is an explanation view of a churning-pulverizing rotor of the first embodiment of the present invention;
Fig. 9 is an explanation view of a condition when in pulverization;
Fig. 10 is a front view, partly in cross section showing a second embodiment of the present invention;
Fig. 11 is an expanded view of main part showing the second embodiment of the present invention;
Fig. 12 is a front view, partly in cross section showing a third embodiment of the present invention; and
Fig. 13 is an expanded view of main part showing the third embodiment of the present invention.

DETAILED DESCRIPTION

Preferred embodiments of the present invention are described in more detail below referring to the accompanying drawings.
An understanding of the present invention may be best gained by reference Figs. 1 to 9. Figs. 1 to 9 illustrate a method for pulverizing and classifying cereals and the like, wherein it proceeds to pulverize cereals such as a soybean and rice by high-speed rotation, the stamping is pulverized in the shape of a particle 50 microns or less, is preferably pulverized at around 10 microns, of a first embodiment of the present invention.
The mark M is the method for pulverizing and classifying cereals such as a soybean and rice, etc. and includes a spiral air current generating process A, pulverization process B and process C for extracting the small pulverization thing and adjustment process D of the particle size.
The spiral air current generating process A produces the air flow which passes through, directed to a pulverization zone from a classification zone, inside of the classification zone surrounded by an inner circumferential surface in the shape of a truncated cone, the inner circumferential surface having smaller diameter to the downstream direction and provided at the downstream part of the pulverization zone surrounded by an inner circumferential surface in the shape of a cylinder. In addition, in the pulverization zone, a blade for churning-pulverizing provided at the axle into the pulverization zone has spiral air current directed to the classification zone while the current is circling in near a center portion of the pulverization zone.
In the pulverization process B, the stamping sent into the pulverization zone from the upstream part thereof strikes the blade for churning and pulverizing by blowing the air current and pulverized. In the circumferential part of the pulverization zone, the centrifugal air current directed to the radius direction and outside thereof is produced, it grinds more minutely using the churning action by the centrifugal air current, it puts on the spiral air current from the detailed stamping in order, and it is sent into the classification zone.
In the extraction process C, the stamping carried from the pulverization zone by high-rotation of the blade around the central axis is divided into the stamping having large and small mass. The stamping having large mass moves to the inner circumferential surface in the shape of a truncated cone while it is pulverized by the centrifugal air current produced by the blade and is returned back to the pulverization zone. On the other hand, the stamping having small mass gets in the spiral air current produced around the central part of the classification zone to the direction and can be taken it out to the downstream thereof.
In particle size adjustment process D, the particle size of the pulverized stamping taken out from the classification zone can be adjusted by fluctuating selectively the number of rotation of the blade or the air current flow which makes it pass towards the classification zone from the pulverization zone.
The pulverizing-classifying method M can be done using the pulverizing-classifying device 1 which can pulverize the cereals.
The pulverizing-classifying device 1 which can pulverize the cereals and the like is composed of a pulverization chamber 10, axle 11, at least one churning-pulverizing rotor 13 having a plurality of blades 12 for churning and pulverizing, formed in the direction of radiation, and churning-classifying rotor 15 having a plurality of blades 14 for churning and classifying in the direction of radiation, as shown in Figs. 2 to 9.
The pulverization chamber 10 is composed of a pulverization case 3 having a pulverization room 2 formed in the shape of a cylinder and a classification case 9. The classification case 9 further has a side case 5 having an injection mouth 4 provided at portion adjacent an upstream of the pulverization case 3 and a classification room 8, formed in the shape of a truncated cone, having an extraction mouth 7 in the direction of an axis, the mouth 7 having a large diameter end connected to the downstream portion of the pulverization case 3 and having a small diameter end connected to a suction duct 6.
The axle 11 is attached rotatably in the side case 5 so that it rotates to the circumference of axle of the pulverization chamber 10. Furthermore, the axle 11 drives by power source provided at the outside of the pulverization chamber 10.
The blades 12 can churn and pulverize the stamping supplied from the materials injection mouth 4 of the side case 5 in the pulverization room 2.
The blades 14 of the churning-classifying rotor 15 approaches and counters the inner circumferential surface, formed in the shape of the truncated cone and has the tip portion which inclined so that it is provided along the inner circumferential surface respectively.
The pulverization chamber 10 is fixed to a floor surface of the building. A support frame 16 provided in the floor surface supports the axle 11 attached by penetrating a seal member 18 of the side case 5 of the pulverization chamber 10 through a pair of bearings 17,17 rotatably. Furthermore, the other end of the axle 11 is connected with an output axle 21 of a motor 20 as a power source provided in the floor surface through a joint 19.
Moreover, the extraction mouth 7 for the stamping is provided in the classification case 9 of the pulverization chamber 10, and a duct connection part 22 connected to the suction duct 6 is attached in it, the suction duct 6 connected to the suction fan 24 through the bug filter 23.
In order to prevent that the pulverization chamber 10 becomes high temperature with the heat, which occurs by materials pulverization, the water jackets 25,26 are formed of the pulverization case 3 and the classification case 9 respectively.
The churning-pulverizing rotor 13 and churning-classifying rotor 15 are provided so as to hold a predetermined interval by a spacer 27 at the end of the axle 11 and provided both sides of the axle 11 by a pair of keys 28.
Moreover, a board 29 is being to an end surface of the axle 11 with a fixed bolt 30. Accordingly, the omission from axle 11 of the churning-pulverizing rotor 13 and churning-classifying rotor 15 are prevented.
Positioning adjustment of the churning-pulverizing rotor 13 is carried out in the axis direction within the pulverization chamber 10 by a positioning sleeve 31 which touches on the one side of one side of the churning-classifying rotor 15 so that it is arranged in the pulverization room 4 adjacent the injection mouth 4. Moreover, positioning adjustment of the churning-classifying rotor 15 is carried out in the axis direction within the pulverization chamber 10 by the positioning sleeve 31 that touches on the one side of the churning-classifying rotor 15 so that the most part thereof is arranged in the classification room 8.
As shown in Figs. 6 and 7, the churning-pulverizing rotor 13 has an insertion hole 32 for attaching to the axle 11, formed in the central part thereof. And six blades 12 for churning and pulverizing are provided respectively in the radial direction focusing on the insertion hole 32.
These blades 12 are formed in the shape of a propeller in thickness, and they are toughly made so that it can be ground the materials by rotating at high-speed.
As shown in Fig. 8, the churning-pulverizing rotor 15 has an insertion hole 33 for attaching to the axle 11, formed in the central part thereof. And six blades 14 for churning and pulverizing are provided respectively in the radial direction focusing on the insertion hole 33.
As shown in Fig. 9, a top portion of the blade 14 has an inclined tip surface 35 and a parallel tip surface 36. The inclined tip surface 35 approaches so as to along an inner circumferential surface 34 of the classification room 9 and opposes it. The parallel tip surface 36 in connected to the surface 35 and provided in the axle direction of the axle 11, having maximum diameter in the rotor. The parallel tip surface 36 is formed in the short length that approaches with inner circumferential surface of the pulverization case 3 and opposes it.
In addition, two or more sets of churning-pulverizing rotor 13 and churning-classifying rotor 15 may be put in order in the direction of the axis of the axle 11 respectively.
As shown in Fig. 3, in order to fail to scratch the stamping of the materials adhering to an inner wall 37 of the side case 5 having the injection mouth 4, in accordance with the wall within an inner wall 37, revolution scraper 38, rotating at the center of the axle 11, is installed in the pulverization chamber 10.
The revolution scraper 38 is fixed to the inner circumferential surface of a ring gear 39 having gears on the perimeter, which provided rotatably between the side case 5 and the pulverization case 3.
In the ring gear 39, an annular slot 40 formed in the shape of a cross-sectional ⊐ shape is formed with a side face which opposes to the inner wall 37 of the side case 5, concentric with the ring gear 39. In the slot 40, a plurality of receptacle rollers 41 is provided rotatably in the inner wall 37 of the side case 5 engages the ring gear 39 and support rotatably.
The space between the both side surfaces of the ring gear 39 and the opposing faces of the side case 5 and pulverization case 3 opposes the ring gear 39 respectively is sealed with a pair of seal rings 42, adjacent to the position toward the inner circumferential side from the position provided the rollers 41. Moreover, in the outer side, a pair of guide metals 43 regulates movement in the axle direction of the ring gear 39 to the pulverization chamber 10.
The ring gear 39 is gears with a drive pinion 44 in the space between the side case 5 and the pulverization case 3 which are formed in the lower part of the pulverization chamber 10.
The drive pinion 44 is fixed to an pinion axle 45 supported rotatably between an overhang parts, projected downwards, formed at the side case 5 and the classification case 9 respectively.
A geared motor 46, which drives the pinion axle 45, is attached in the overhang part of the classification case 9. When the geared motor 46 rotates with the pinion axle 45, the ring gear 39 is rotated through the drive pinion 44, and the revolution scraper 38 revolves.
In the pulverization chamber 10, the second revolution scraper 47, which drives along with the inner circumferential surface of the pulverization case 3 of the axle 11, is formed.
The second revolution scraper 47 is fixed to the inner circumferential surface of a ring gear 48. Moreover, the ring gear 48 is supported rotatably between the pulverization case 3 and the classification case 9 with the same structure as the ring gear 39. The gear tooth formed in the outer circumferential of the ring gear 48 gears to a drive pinion 49 fixed to the pinion axis 45, together with the drive pinion 44.
Therefore, when the geared motor 46 rotates with the pinion axis 45, the second revolution scraper 47 rotates with the revolution scraper 38 along with the inner circumferential surface of the pulverization case 3.
A third revolution scraper 50 is formed along with the inner circumferential surface 34 in the shape of a truncated cone adjacent the extraction mouth 7 of the classification case 9 so as to drive with the axle 11.
The revolution scraper 50 is fixed to the inner circumference portion of a ring gear 51 arranged between the classification case 9 and the duct connection part 22. The gear tooth currently formed at the outer circumferential portion of the ring gear 51 has geared with a drive pinion 53 of a geared motor 52 attached to the outer portion of the duct connection part 22.
The ring gear 51 is supported as the same structure as the ring gear 39 and the ring gear 48. The third revolution scraper 50 drives by transmitting rotation of the geared motor 52 to a ring gear 51 through the drive pinion 53.
A fixed scraper 55 is provided so as to have an interval to pass an attached portion 54 of the scraper 50 and oppose with the inner circumferential surface of the ring gear 51.
When the attached portion 54 passes through the outside of the fixed scraper 55, the fixed scraper 55 has the role which scratches the stamping of the materials which adhere and deposits among the attached portion 54.
In addition, the scrapers 38, 47 and 50 drive at 1 to 10 rotations per minute continuously or drive for every fixed time by control of a timer and the like.
A corner a and projection b of the inner wall of the pulverization chamber 10 are formed on the smooth circular curved surface having concave or convex circular shape respectively, and mirror finish of the whole inner wall is done. When the materials having the large amount of oil contained in soybean is grinded, it is hard to adhere the stamping to the inner wall of the pulverization chamber 10.
Moreover, in order to prevent generating corrosion or rust with the humidity contained in materials such as soybean to grind, stainless steel is used for material, which is the main composition parts of the pulverizing-classifying device 1 such as the pulverization chamber 10, axle 11, churning-pulverizing rotor 13 and churning-classifying rotor 15.
The pulverizing-classifying device 1 operates the motor 20 and make the axle 11 drive while they attract air from the extraction mouth 7 of the pulverization chamber 10 by the suction fan 24 through the suction duct 6, churning-pulverizing rotor 13 and churning-classifying rotor 15 in pulverization chamber 10 allow to rotate at high speed of per minute 1800 to 18000 rotations.
In the pulverization chamber 10, the air current which flows the surroundings of the axle 11 by rotation of the blade 12 and is generated at high-speed rotation.
In the central portion of the pulverization chamber 10, this air current is drawn in the air flow to go to the extraction mouth 7 from the injection mouth 4 by the suction fan 24, as a result, at high speed, spiral air current E in the shape of a tornado which it flows to the suction duct 6 at high speed is generated.
Moreover, near the blades 12,14, the centrifugal air currents F and G which go outwardly in the radius direction, at the outer circumferential portion of the spiral air current E respectively are generated.
After driving the suction fan 24 and the axle 11 and stabilizing the rotating state, materials such as soybean is thrown in the pulverization chamber 10 from the injection mouth 4.
In this case, supply of the materials to the injection mouth 4 adjusts the degree of opening of a damper from a materials hopper etc., and it may perform it adjusting the amount of supply. However, in order to control the amount of supply of materials more correctly, it is desirable to carry out using supply means such as screw feeder and oscillating feeder.
Materials H supplied into the pulverization chamber 10 from the injection mouth 4 rides in the air current produced by the suction fan 24, and is inhaled to the pulverization zone J formed into the pulverization room 2 of the pulverization chamber 10.
Materials H which invaded into the pulverization zone J is broken by the large and small particle by colliding with the edge part of the blade 12 which is rotating at high speed. And the detailed pulverization thing produced at that time rides on spiral air current E and is carried immediately to the classification zone K formed in the classification room 8.
Since the particle of the most materials carried to the pulverization zone J is coarse and its mass is still large, the particle moves to the radius direction within pulverization zone J, and rides on centrifugal air current F and is churn. In addition, It is ground still finely by a collision of particles, or the collision with a particle and inner circumferential surface of the pulverization room 2.
Thus, since an action of centrifugal force is smaller than what has a coarse particle size, the moves to the central part of the pulverization zone J, is caught by spiral air current E and moves to the classification zone K.
In this case, since the pulverization thing H flows around the axis of the pulverization chamber 10 by the spiral air current E, by action of centrifugal force, the coarse particle of a pulverization thing moves outwardly in the radius direction, and a fine particle moves inwardly in the radius direction.
Then, these pulverization things invade into the classification zone K, the revolution speed of the spiral air current E will be raised by the blade 14 that rotates at high-speed. Furthermore, since the centrifugal air current G has arisen on the outer circumferential portion of the spiral air current E, among the pulverization things sent in from the pulverization zone J, what has a comparatively coarse particle size moves to the outer circumferential portion of the spiral air current E in response to an action of centrifugal force, and is caught by the centrifugal air current G, and the part is agitated by the centrifugal air current G, and is ground still finely.
If the centrifugal air current G collides with the inner circumferential surface 37 of the classification zone K, its direction is changed to the pulverization zone J along with the inclination of the circumferential surface within the inner circumferential surface 37. Coarse pulverization things also flow back to the pulverization zone J and will be ground again finely here.
The pulverization thing, with a comparatively fine particle size, sent into the classification zone K, and the pulverization thing made fine by the centrifugal air current G ride on the spiral air current E and are discharged from the extraction mouth 7 to the suction duct 6, it is caught by the bug filter 23 and taken out through the rotating valve 56 on the way to the suction fan 24.
The following result was obtained when the pulverization examination was performed, having actually used the dryness raw soybean as materials with the above-mentioned device 1.
[1]
Number of rotations of axle 11: 6000rpm
Suction quantity of suction fan 24: 20m³ /min
Amount of injected material: 80kg/Hr
Size of pulverized particle: 10µm∼20µm (average diameter of particle)
[2]
Number of rotations of axle 11: 5500rpm
Suction quantity of suction fan 24: 25m³ /min
Amount of injected material: 100kg/Hr
Size of pulverized particle: 10µm∼20µm (average diameter of particle)
[3]
Number of rotations of the axle 11: 4000rpm
Suction quantity of suction fan 24: 30m³ /min
Amount of injected material: 150kg/Hr
Size of pulverized particle: 30µm∼50µm (average diameter of particle)
[4]
Number of rotations of the axle 11: 8000rpm
Suction quantity of suction fan 24: 10m³ /min
Amount of injected material: 60kg/Hr
Size of pulverized particle: 5µm∼10µm (average diameter of particle)
[5]
Number of rotations of the axle 11: 12000rpm
Suction quantity of suction fan 24: 10m³ /min
Amount of injected material: 40kg/Hr
Size of pulverized particle: 0.3µm∼1µm (average diameter of particle)
In addition, the motor 20, which is the source of a drive of the axle 11, having 30 h.p. of outputs and characterizing in the number-of-rotations variable is used in the classification grinder 1 in [1], [2], [3], [4] and [5], the quantity of the suction for the suction fan 24 also is used the variable thing.
In addition, in this embodiment, since the blade for the churning pulverization 12 is formed in the shape of a propeller as shown in Figs. 6 and 7, although there is an advantage which can collaborate with the suction fan 24 suction and can inhale air efficiently from the injection mouth 4, the blade 12 can be ground in the shape of a particle, even if it uses what is not necessarily the form which has the function which inhales air.

Other embodiment

Other embodiments of the present invention will now be described referring to Figs. 10 to 13. Through the drawings of the embodiments, like components are denoted by like numerals as of the first embodiment and will not be further explained in great detail.
A second embodiment of the present invention is shown in Figs. 10 and 11. It is distinguished from the first embodiment by the fact that two churning pulverization rotors 13,13 are fixed to the axle 11 in to the pulverization chamber 10 respectively.
A pulverizing-classifying device 1A according to the second embodiment has similar advantages to that according to the first embodiment.
A third embodiment of the present invention is shown in Figs. 12 and 13. It is distinguished from the first embodiment by the fact that two axle 11,11 of two pulverization chambers 10,10 can be driven by a motor 20A.
A pulverizing-classifying device 1B according to the third embodiment has similar advantages to that according to the first embodiment.
In addition, the pulverization chambers 10,10 and the support frames 16,16 are arranged on the same axis in a condition that the pulverization thing extraction mouths 7,7 turn on the contrary respectively. The churning pulverization rotors 13,13 and the axles 11,11 are connected with the output axle 21,21 of the motor 20A as a power source through the joints 19,19 respectively.
The output axes 21,21 are projected on both sides thereof, and the motor 20A can drive the churning-pulverizing rotors 13,13 and churning-classifying rotors 15, 15 of the chamber 10 simultaneously by the motor 20A.
Pulverizing operation in the pulverization chambers 10 has similar operation to that according to the first embodiment. The extraction mouths 7,7 of the pair of pulverization chambers 10,10 are connected with the suction ducts 6,6 respectively.
In addition, concerning the suction ducts 6,6, when processing simultaneously the materials that are different by two pulverization chambers 10,10, the ducts 6 are just to connect with the bug filter 23 or suction fun 24. When the pulverization chambers 10,10 process the same materials, each of the ducts 6,6 is attached together, and they are connected with the filter 23 and the suction fan 24.

Industrial Applicability

As set forth above, by the method for pulverizing-classifying cereals and the like of the present invention, a pulverization thing and uniform can be manufactured in a short time.
Moreover, a pulverization thing can be adjusted to a desired particle size in the large range of few micron from hundreds of microns only by doing increase-and-decrease adjustment of one of the flow rate of an air current which classification zone is passed from the pulverization zone, and the number of rotations of the blade for churning and classifying. And change and adjustment of a particle size can be performed without stopping operation of a pulverizing- classifying device.
Furthermore, by chemical analysis with the applicant in the present application, when cereals, such as a soybean and rice is ground in the shape of about 10 microns, if the materials is used for a contained agricultural chemicals, the contained agricultural chemicals was able to become zero and was able to remove agricultural chemicals.
That is, grinding in the shape of a particle about 10 microns that it was removed by destroying the numerator of agricultural chemicals thinks it.
Furthermore, it can be failed automatically to scratch the materials adhering to the inner wall of the pulverization chamber by having the revolution scraper.
Consequently, since it can prevent causing trouble to rotation of the churning pulverization rotor and churning classification rotor when materials accumulate on the inner wall of pulverization chamber, a short-term maintenance can be made unnecessary and it is easy to maintain the device.
A corner a and projection b of the inner wall of the pulverization chamber 10 include the smooth circular curved surface having concave or convex circular shape respectively. Mirror finish of the whole inner wall is done. When the materials having the large amount of oil contained in soybean is grinded, It is hard to adhere the stamping to the inner wall of the pulverization chamber 10.
Furthermore, pulverization processing of the materials in a pair of the pulverization chambers can be performed in the common power source. Also the materials of the same kind or different species can be simultaneously processed by both of the pulverization chambers, and the pulverizing-classifying device at high-performance efficiency can be constituted compactly and cheaply.

Claims

A method for pulverizing and classifying of cereals, including:

spiral air current generating process producing the air flow which pass through, directed to a classification zone from a pulverization zone, inside the classification zone surrounded by an inner circumferential surface formed in the shape of a truncated cone thereof, the inner circumferential surface having a smaller diameter end to the downstream direction and provided at the downstream part of the pulverization zone surrounded by an inner circumferential surface formed in the shape of a cylinder, and in the pulverization zone, a blade for churning-pulverizing provided at an axle into the pulverization zone has spiral air current directed to the classification zone while the current is circling in near a center portion of the pulverization zone;

pulverization process, the stamping sent into the pulverization zone from the upstream part thereof strikes the blade for churning and pulverizing by blowing the air current and pulverized, and in the circumferential part of the pulverization zone, the centrifugal air current directed to the radius direction is produced in an outer circumferential part of the pulverization zone, it grinds more minutely using the churning action by the centrifugal air current, it puts on the spiral air current from the pulverization thing which become detailed in order, and sends into the classification zone;

extraction process, the stamping carried from the pulverization zone by high-rotation of the blade around the central axis is divided into the stamping having large and small mass, and the stamping having large mass moves to the inner circumferential surface side having the truncated cone shape while it is pulverized by the centrifugal air current produced by the blade and is returned back, on the other hand, the stamping having small mass gets in the spiral air current produced around the central part of the classification zone to the direction and can be taken it out to the downstream thereof; and

adjustment process for the particle size, being adjusted the particle size of the pulverized stamping taken out from the classification zone by fluctuating selectively the number of rotation of the blade or the air current flow which makes it pass towards the classification zone from the pulverization zone.
A device for pulverizing and classifying comprising:

a pulverization chamber further including a pulverization case having a pulverization room formed in the shape of a cylinder, and a classification case having a side case with an injection mouth provided at a portion adjacent an upstream of the pulverization case and a classification room, formed in the shape of a truncated cone, having an extraction mouth in the direction of an axis, the mouth extending from a large diameter end connected to the downstream portion of the pulverization case to a small diameter end connected to a suction duct;

an axle attached rotatably in the side case so that it rotates to the circumference of axle of the pulverization chamber, the axle driving by a power source provided at the outside the of the pulverization chamber;

at least one churning-pulverizing rotor having a plurality of blades for churning and pulverizing, formed in the direction of radiation, the blade churning and pulverizing the stamping supplied from the injection mouth of the side case in the pulverization room; and

a churning-classifying rotor having a plurality of blades for churning and classifying in the radial direction, the blades approaching and countering the inner circumferential surface, formed in the shape of a truncated cone and has a tip portion which is inclined so that it is provided along the inner circumferential surface thereof respectively.
The device for pulverizing and classifying according to claim 2, wherein at least one or more revolution scrapers which circle along with an inner wall surface thereof are provided in the pulverization chamber so as to scratch the pulverization thing adhering to the inner wall surface of the pulverization chamber.
The pulverizing-classifying device according to claims 2 and 3, wherein a corner and projection of the inner wall of the pulverization chamber 10 are formed on a smooth circular curved surface having a concave or convex circular shape respectively.
The pulverizing-classifying device according to claims 2 and 3, wherein the inner wall of the pulverization chamber is done with mirror finish.
The pulverization classification machine according to claims 2 to 5, wherein a pair of pulverization chamber arranged on the same axis in a condition that the extraction mouths turn on the contrary respectively and the axle provided in each pulverization chamber is connected with a common power source.