EP0282950B1 - Micronizing apparatus - Google Patents
Micronizing apparatus Download PDFInfo
- Publication number
- EP0282950B1 EP0282950B1 EP88104020A EP88104020A EP0282950B1 EP 0282950 B1 EP0282950 B1 EP 0282950B1 EP 88104020 A EP88104020 A EP 88104020A EP 88104020 A EP88104020 A EP 88104020A EP 0282950 B1 EP0282950 B1 EP 0282950B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- product
- disk
- flow
- distributing
- ring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C19/00—Other disintegrating devices or methods
- B02C19/0012—Devices for disintegrating materials by collision of these materials against a breaking surface or breaking body and/or by friction between the material particles (also for grain)
- B02C19/0018—Devices for disintegrating materials by collision of these materials against a breaking surface or breaking body and/or by friction between the material particles (also for grain) using a rotor accelerating the materials centrifugally against a circumferential breaking surface
- B02C19/0025—Devices for disintegrating materials by collision of these materials against a breaking surface or breaking body and/or by friction between the material particles (also for grain) using a rotor accelerating the materials centrifugally against a circumferential breaking surface by means of a rotor with radially extending channels
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Disintegrating Or Milling (AREA)
- Mixers Of The Rotary Stirring Type (AREA)
- Crushing And Grinding (AREA)
- Crushing And Pulverization Processes (AREA)
- Water Treatment By Sorption (AREA)
- Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
- Nozzles (AREA)
Abstract
Description
- The invention relates to a micronizing apparatus for processing organic and inorganic products.
- Document US-A-3 065 919 describes an apparatus for micronic grinding, comprising means for feeding the product, together with at least one product-conveying fluid such as ambient air, to a first distributing disk with vertical axis, which by rotating distributes the composite flow on the rough surface of a first ring where a first comminution or grinding of the product takes place, the air-and-product flow being then conveyed to a second distributing disk with vertical axis and of a greater diameter, which is rotated at a higher speed than the first disk, and which accelerates and uniformly distributes the said flow on a second comminution ring of a very hard material and tapered downwardly, whereby some of the product will temporarily stay on the said ring, and will be broken owing to the dynamic impact thereon of the product particles progressively delivered from the said second distributing disk, and reaches a third comminution or grinding stage comprising a disk and a ring which are similar to the second disk and ring, and from which the said flow is finally discharged for further processing.
- Documents US-A-1 772 150 and FR-A-2 538 718 disclose grinding apparatuses in which the product is delivered to the center of the respective single grinding disks.
- According to the present invention, there is provided a micronizing or grinding apparatus for processing organic and inorganic products, of the type disclosed above with reference to document US-A-3 065 919 which is characterized by the fact that the product is delivered to the centre of the disks (10, 21, 35) and that the product flow leaving the second grinding stage is mixed with a fresh ambient air flow before reaching the third grinding stage.
- Further features and advantages of the apparatus are disclosed in the dependent claims.
- The apparatus object of the present invention will be now described with reference to the figures of the attached sheet of drawings, in which:
- Figure 1 diagrammatically shows the apparatus in a sectional view taken on an ideal vertical plane containing the axis of rotation of the distributing disks;
- Figures 2 and 3 show some possible configurations of the channels in the distributing disks, in a sectional view taken on line II-II of figure 1;
- Figure 4 shows the chamber from which flows the micronized product, in a sectional view taken on line IV-IV of figure 1.
- In figure 1 there appears that the product to be processed is fed from the top of the apparatus into the funnel-shaped chamber 1, through a flow- or flow rate-regulating device, such as for example, a star-shaped rotary valve diagrammatically shown at 2, the whole in such a manner that only a predetermined and adjustable flow of product will flow into the said chamber 1. The chamber 1 is surrounded by a
larger chamber 3 which is also fixed to the frame or to thecasing 4 of the apparatus, the whole in such a manner that between thechambers 1 and 3 there will be left aninterspace 5 which is open to the atmosphere through a duct 6 intercepted by a flow-regulatingvalve 7 and a filter 8. - The chamber 1 and the
interspace 5 co-axially discharge into thewell 9 provided in a horizontalcircular disk 10 which by suitable means to be disclosed hereinafter, is supported and is rotated at the required speed around its axis, always in one direction. Thedisk 10 is radially provided with a plurality ofequispaced channels 11 of a suitable cross-section, and preferably having the configuration shown in plan view in figure 2, or the configuration of the alternative embodiment according to figure 3, which will be described later on. - The
disk 10 consists of two superposed disks which are secured to each other by means of screws, and in one of them, for example in the lower disk, thechannels 11 are formed, for example, by milling or by electroerosion, while the function of the other disk is to close the said channels at their top side. - Around the
disk 10 and at the proper distance therefrom, aring 12 is co-axially provided, with its generatrix being vertical and with its inner surface 112 being suitably roughened, for example, by knurling, by electroerosion, or by any other suitable tecnique. Thering 12 is made of any suitable wear-resistant material, for example, of steel or cast iron. - The
ring 12 has its upper edge closed by thecasing 4 of the apparatus, and has its lower edge connected to a funnel-shaped chamber 13. - The distributing
disk 10 can be rotatably supported as shown in figure 1 by the vertical shaft of abevel gear pair 14, with thebox 15 containing same being supported by equispaced spokes 16 secured tochamber 13. The horizontal shaft ofgears 14 is connected to ashaft 17 which is tightly passed through the sidewall ofchamber 13, and which is to be connected to a gearedmotor 18 fixed to theportion 104 of the casing of the apparatus. - It is understood that differently from what has been described and shown, the
disk 10 may be rotatably supported by thechamber 13 or by thecasing 4, and that the driving of said disk may be effected with means located in theupper chamber 19, to avoid the presence inchamber 13 of the spokes 16 and theshaft 17 which inevitably cause a loss of head in the flow flowing through the apparatus. - The funnel-
shaped chamber 13 discharges into thecentral well 20 provided in the distributingdisk 21, which is similar to the previously considereddisk 10, but that it has a greater diameter. Shown at 11ʹ are the channels provided indisk 21, which are similar to thechannels 11 shown in figures 2 or 3, but which differ from the former since they are longer, and their depth slightly decreases from the interior toward the exterior of saiddisk 21. - The
disk 21 is keyed onto the upper end of avertical shaft 22 which is rotatably supported by an intermediate support provided withbearings 23, and which in turn is fastened to abase frame 24. The lower end ofshaft 22 is connected through thetransmission drive 25 to amotor 26 mounted onto thebase frame 24 and with adjustable speed. The direction of rotation ofdisk 21 preferably is concordant with that of theupper disk 10, this in order to avoid any loss of head in the flow flowing through the micronizer. - The distributing
disk 21 is co-axially surrounded by aring 27 made of a very hard material, such as steel suitably hardened at least at itsinner surface 127, which is characterized by having a generatrix that is partly vertical and that at its lower end terminates in a curve oriented toward the centre of said ring, and having an angular amplitude between 15° and 90°. The ducts 11ʹ indisk 21 discharge at any suitable intermediate point of the generatrix ofsurface 127. - The lower end of
ring 27 is connected to a funnel-shaped chamber 28 surrounded by achamber 29 forming ahollow space 30 which is open to the atmosphere through a duct 31 intercepted by acontrol valve 32 and afilter 33. - The
chamber 28 and thehollow space 30 discharge co-axially into thecentral well 34 in a distributingdisk 35 keyed onto thedriving shaft 22, which is similar to, and has the same diameter as thedisk 21, but which differs therefrom owing to its downwardly diverging truncated-cone configuration, and due to the fact that its channels 11ʺ, which therefore are longer than the channels 11ʹ, have a height dimension gradually decreasing from the interior toward the outer part of thedisk 35 more markedly than it occurs for channels 11ʹ. - The
disk 35 is surrounded by aring 36 just like theupper ring 27, which at its top side is closed by means of theconnection 204 with thechamber 29, and at its bottom side is connected to achamber 37 fastened onto thebase frame 24, and which is in form of the volute of a centrifugal fan, as shown in figure 4 of the drawings. - The
tangential duct 137 ofsaid chamber 37 is connected to one or to a plurality of cyclones (not shown) for separating the product from air, which in turn are connected to the suction of a fan or a lower (not shown) having suitable characteristics. The suction obtained in thebottom chamber 37 is such that from the outside a proper air stream is drawn through the circuit 5-6-7-8, so that the product gradually introduced into the chamber 1 by the means 2 will get into thewell 9 indisk 10 and will be admixed with the said air stream flowing through thechannels 11, and thanks to the rotation of saiddisk 10 the flow of air and product will be uniformly distributed on the inner surface of therough ring 12, where a first comminution of the product is achieved. Thedisk 10 is rotated at a relatively moderate speed which in any case is much lower than that of theunderlying disks 21 and 35 (see hereinafter). - The air and product flow issuing from the first comminution stage is conveyed from the
chamber 13 into the well 20 indisk 21 which, as already disclosed, is rotated at a relatively high speed, while its channels 11ʹ are longer than thechannels 11. Thanks also to the gradual narrowing of the cross-section area of channels 11ʹ , the flow of air and product is accelerated while it is flowing through the said channels, and as it flows out it violently hits against some of the product temporaneously staying on theinner surface 127 ofring 27, thanks to the downwardly flaring shape of said surface. As a result of the dynamic impact occurring between the product particles on the surface ofring 27, a further and important comminution of said product is achieved on said ring. - The air and product flow issuing from the second comminution stage is conveyed from the
chamber 28 into thewell 34 indisk 35 together with the pressure air flow flowing into the said well from the circuit 30-31-32-33. This fresh flow of air and product, thus reinforced as to its speed and flow rate, flows through the channels 11ʺ indisk 35 which further accelerate the said flow, thanks to the fact that they are longer than the channels 11ʹ and to the more sensible gradual narrowing of their cross-section area. Thanks also to the high speed of rotation of the distributingdisk 35, on theinner surface 136 of ring 36 a further and appreciable comminution of the product is achieved through the dynamic impact between the product particles, similarly to what occurs on the inner surface ofring 27. - In figures 2 and 3 it appears that in correspondence of their intermediate portion, the channels in the distributing disks have a portion 111 which is greater in cross-section, and which permits the forming of turbulences apt to guarantee an efficient mixing of differently fine particles of the product, with a consequent homogenization during the final processing of the product. In the modified embodiment according to figure 3, the sum of the cross-section areas of the terminal branches 211,211ʹ of
channels 11,11ʹ,11ʺ is equal to, or is smaller than the cross-section area of said intermediate portion 111. - The air and product flow issuing from the third comminution stage flows into the
chamber 37 and flows out through theduct 137, and gets to the decantation cyclone or cyclones, where the product is separated from air and is collected into silos or into bags, while air continues to flow toward the suction machine. - It is apparent that by adjusting the suction of air from the outside by means of the
valves driving units - Since the air flowing through the micronizer and conveying the product is sucked from the outside, and is not compressed air, the said air is at ambient temperature and does not modify the properties of the product to be processed. Cooling circuits may be associated, if required, to the
rings - From experiments made by the applicant, it was possible to obtain very satisfactory results when processing even very abrasive products, such as clinker, by adopting the following parameters. The particles of the product fed to the apparatus had a diameter not greater than 5 mm. The diameter of the distributing
disks chamber 37 may vary between 700 and 900 mm. The outside diameter of the casing of the apparatus may vary between 800 and 1000 mm. The distance between the periphery of the distributingdisks relative impact rings shaft 22 may be in the order of 3000 rmp. The rate of the air flow through the apparatus can be in the order of 60 cubic meters/hour. - It is however understood that these parameters may widely vary as a function of the properties of the product to be treated.
- In order to limit any loss of head in the apparatus, it is provided for the ends of
channels 11,11ʹ,11ʺ which open into the central well in the respective distributing disk, to be suitably flared and correctly oriented as a function of the direction of rotation of the distributing disks, as shown, for example, at 311 in figures 2 and 3. Still for this purpose, theshaft 22 may be eliminated. In fact, thedisks overlying chambers disk 10. The rotation of the distributing disks may be otherwise obtained by reaction, by suitably orienting thechannels 11,11ʹ,11ʺ in the direction of theimpact rings - Differently from what has been illustrated the distributing
disks - It is finally understood that depending on the requirements of the product to be treated, the product-conveying medium may consist of a fluid different from air or combined with air, for example, steam.
- The distributing
disks disk 35 may not be conical and may have the configuration ofdisk 21. - Instead of being carried out in three stages, as disclosed, the processing of the product may be effected in two or in four or more stages.
Claims (14)
- A micronizing apparatus for processing organic and inorganic products, comprising means (2,7) for feeding the product, together with at least one product-conveying fluid such as ambient air, to a first distributing disk (10) with vertical axis, which by rotating distributes the composite flow on the rough surface of a first ring (12) where a first comminution or grinding of the product takes place, the air-and-product flow being then conveyed to a second distributing disk (21) with vertical axis and of a greater diameter, which is rotated at a higher speed than the first disk, and which accelerates and uniformly distributes the said flow on a second comminution ring (27) of a very hard material and tapered downwardly, whereby some of the product will temporarily stay on the said ring, and will be broken owing to the dynamic impact thereon of the product particles progressively delivered from the said second distributing disk (21), and reaches a third comminution or grinding stage comprising a disk and a ring (35, 36) which are similar to the second disk and ring, and from which the said flow is finally discharged for further processing,
characterized by the fact that inlet means (1,13,28) are provided so that the product is delivered to the centre of the disks (10, 21, 35) and that means (31,32,33) are provided so that the product flow leaving the second grinding stage is mixed with a fresh ambient air flow before reaching the third grinding stage. - The apparatus according to claim 1, in which the first impact ring (12) is made from cast iron and is internally roughened by knurling, or by electroerosion, or by any other suitable technique.
- The apparatus according to claim 1, in which the impact rings (27,36) of the second and the third comminution stage are made of steel and have their inner surface, on which the comminution takes place, hardened by means of any suitable treatment.
- The apparatus according to claim 3, in which the inner surface of the impact rings (27,36) of the second and the third comminution stage has a generatrix partly formed by a straight line and terminating at its lower end in a curve which is oriented towards the centre and has an angular amplitude between 15° and 90°.
- The apparatus according to claim 1, in which suitable means may be provided for cooling the different impact rings (12,27,36).
- The apparatus according to claim 1, in which the distributing disks (21,35) of the second and the third comminution stage have substantially the same diameter, so that it is possible to use impact rings (27,36) with like features, the last distributing disk (35) being shaped with a downwardly diverging conical configuration.
- The apparatus according to claim 1, in which the third disk has a greater diameter than the second disk.
- The apparatus according to claim 1, in which suitable means may be provided for adjusting the speed of rotation of the distributing disks (10,21,35).
- The apparatus according to claim 1, characterized by the fact that the distributing disks (10, 21, 35) are provided with radially directed distributing channels (11, 11ʹ, 11ʺ).
- The apparatus according to claim 9, in which the rotation of the distributing disks (10,21,35) is obtained by means of the reaction of the flow against the respective impact ring, the channels (11,11ʹ,11ʺ) in the distributing disks being accordingly suitably oriented.
- The apparatus according to claim 9, in which the channels (11,11ʹ,11ʺ) in the distributing disks are characterized by having an intermediate portion (111) which is greater in cross-section.
- The apparatus according to claim 9, in which the inlet ends (311) of the channels (11,11ʹ,11ʺ) in the distributing disks are suitably flared and oriented.
- The apparatus according to claim 9, in which the distributing disks consists each of two superposed disks secured to each other by means of screws, so that the channels formed in at least one of the said two disks, for example, by milling, by electroerosion, or by any other suitable technique, will have their surface closed by the other disk.
- The apparatus according to claim 9, in which the channels (11ʹ,11ʺ) in the second (21) and in the third distributing disk (35) are characterized by having a cross-section area which gradually decreases towards the periphery of the respective disks.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT88104020T ATE86887T1 (en) | 1987-03-18 | 1988-03-14 | FINE SHREDDING DEVICE. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT8712442A IT1208258B (en) | 1987-03-18 | 1987-03-18 | MICRONIZER APPARATUS FOR THE TREATMENT OF ORGANIC AND INORGANIC PRODUCTS |
IT1244287 | 1987-03-18 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0282950A2 EP0282950A2 (en) | 1988-09-21 |
EP0282950A3 EP0282950A3 (en) | 1989-07-19 |
EP0282950B1 true EP0282950B1 (en) | 1993-03-17 |
Family
ID=11140212
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP88104020A Expired - Lifetime EP0282950B1 (en) | 1987-03-18 | 1988-03-14 | Micronizing apparatus |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0282950B1 (en) |
JP (1) | JPS63291652A (en) |
AT (1) | ATE86887T1 (en) |
DE (1) | DE3879242T2 (en) |
ES (1) | ES2038709T3 (en) |
IT (1) | IT1208258B (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4210317A1 (en) * | 1992-03-30 | 1992-10-15 | Georg Dipl Ing Deppermann | High speed grinding mill for producing very fine powder - has rotor shaped to produce uniform stress at high speed |
JP4386780B2 (en) * | 2004-03-31 | 2009-12-16 | 株式会社アーステクニカ | Crushing and classifying device |
EP2322279B1 (en) * | 2009-11-17 | 2016-05-11 | Biohyst Overseas Sagl | Biomass crushing and separating device |
CN104258953B (en) * | 2014-09-03 | 2016-08-24 | 深圳市恒德创新科技有限公司 | Compound bistrique and Flour milling method thereof |
CN105833979B (en) * | 2016-05-13 | 2017-12-22 | 太原理工大学 | One kind collision abrading type ultrafine grinding device |
US11185892B2 (en) * | 2016-07-29 | 2021-11-30 | 9754741 Canada Ltd. | Method and apparatus for singulating particles in a stream |
CN113210110B (en) * | 2021-04-26 | 2022-10-04 | 安徽鸿媵堂中药饮片有限公司 | Preparation process of dendrobium superfine powder |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1772150A (en) * | 1928-08-14 | 1930-08-05 | Silas A Knowles | Grinding or pulverizing machine |
US3065919A (en) * | 1960-09-06 | 1962-11-27 | Colorado Mfg & Mining Co Inc | Ore concentrator |
US3995784A (en) * | 1975-03-21 | 1976-12-07 | Consejo Nacional De Ciencia Y Tecnologia | Rotary mill for micronic grinding |
FR2538718B1 (en) * | 1982-12-30 | 1986-02-28 | Creusot Loire | CENTRIFUGAL GRINDER WHEEL |
-
1987
- 1987-03-18 IT IT8712442A patent/IT1208258B/en active
-
1988
- 1988-03-14 EP EP88104020A patent/EP0282950B1/en not_active Expired - Lifetime
- 1988-03-14 DE DE8888104020T patent/DE3879242T2/en not_active Expired - Fee Related
- 1988-03-14 AT AT88104020T patent/ATE86887T1/en not_active IP Right Cessation
- 1988-03-14 ES ES198888104020T patent/ES2038709T3/en not_active Expired - Lifetime
- 1988-03-16 JP JP63060639A patent/JPS63291652A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
ATE86887T1 (en) | 1993-04-15 |
JPS63291652A (en) | 1988-11-29 |
DE3879242T2 (en) | 1993-07-22 |
DE3879242D1 (en) | 1993-04-22 |
IT1208258B (en) | 1989-06-12 |
IT8712442A0 (en) | 1987-03-18 |
EP0282950A3 (en) | 1989-07-19 |
ES2038709T3 (en) | 1993-08-01 |
EP0282950A2 (en) | 1988-09-21 |
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