EP3485975B1 - Zerkleinerungsvorrichtung, die einen hohen zerkleinerungsdurchsatz erlaubt sowie eine variation der grössenverteilung der zerkleinerten partikel - Google Patents

Zerkleinerungsvorrichtung, die einen hohen zerkleinerungsdurchsatz erlaubt sowie eine variation der grössenverteilung der zerkleinerten partikel Download PDF

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Publication number
EP3485975B1
EP3485975B1 EP18200085.1A EP18200085A EP3485975B1 EP 3485975 B1 EP3485975 B1 EP 3485975B1 EP 18200085 A EP18200085 A EP 18200085A EP 3485975 B1 EP3485975 B1 EP 3485975B1
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EP
European Patent Office
Prior art keywords
rotor
sieve
openings
screen
grinding
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.)
Active
Application number
EP18200085.1A
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English (en)
French (fr)
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EP3485975A1 (de
Inventor
Antoine Virdis
Glenn Corminboeuf
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
FREWITT FABRIQUE DE MACHINES SA
Original Assignee
FREWITT FABRIQUE DE MACHINES SA
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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
    • B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
    • B02C18/06—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
    • B02C18/062—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives with rotor elements extending axially in close radial proximity of a concentrically arranged slotted or perforated ring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
    • B02C23/16—Separating or sorting of material, associated with crushing or disintegrating with separator defining termination of crushing or disintegrating zone, e.g. screen denying egress of oversize material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
    • B02C18/06—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
    • B02C18/08—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives within vertical containers
    • B02C18/10—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives within vertical containers with drive arranged above container
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
    • B02C23/16—Separating or sorting of material, associated with crushing or disintegrating with separator defining termination of crushing or disintegrating zone, e.g. screen denying egress of oversize material
    • B02C2023/165—Screen denying egress of oversize material

Definitions

  • the present invention relates to a grinding device, comprising a rotor and a sieve, allowing a high grinding rate and the possibility of varying the size distribution of the ground particles.
  • known systems for treating by grinding a material such as a solid or powdery substance intended for the manufacture of a pharmaceutical, food or other product, use a rotor mounted to rotate against a filtering part, or sieve.
  • the material to be granulated is struck by the rotor and / or pressed between the rotor and the screen.
  • the sieve makes it possible to sort the crushed material as it flows through the openings.
  • the screens are generally static. They classify materials by passing them through openings which separate them according to the size of the particles.
  • the desired properties of the crushed material can be obtained by suitably selecting the appropriate crushing parameters, such as the rotational speed of the rotor and the size of the apertures. sieve (more or less fine mesh).
  • the size distribution of the crushed particles which pass through the screen depends on the openings of the screen.
  • the correct selection of the appropriate grinding parameters is also critical to avoid a significant increase in the temperature which could be detrimental to the quality of the ground material. Another problem is to obtain a high flow rate of the ground material through increasingly smaller openings.
  • a grinding device which a system uses to improve the grinding capacity according to the preamble of claim 1 is disclosed in the document US4487371A .
  • the present invention relates to a grinding device for carrying out a grinding operation, the device comprising a grinding chamber intended to receive a material to be grinded having an average initial size; a rotor, mounted in the chamber rotatably about an axis and comprising a plurality of blades extending radially with respect to the axis; and a screen comprising a plurality of openings and configured to classify and / or fractionate the material crushed by the rotor; the screen being mounted around the rotor so as to rotate about the axis in the opposite direction than the direction of rotation of the rotor; each of the openings having a height extending parallel to the axis and a width extending perpendicular to the axis and between 1 mm and 20 mm; and the rotation of the rotor and that of the screen being adjustable so as to provide a peripheral speed difference between the rotor and the screen of between 100 m / s and 400 m / s, so as to reduce the average initial size of the ground
  • This solution has in particular the advantage compared to the prior art to allow a high grinding rate and the possibility of varying the size distribution of the ground particles by varying the relative speed between the rotor and the sieve. A significant reduction in the temperature of the ground material can also be obtained.
  • the figure 1 shows a sectional view of a grinding device 1 according to one embodiment.
  • the device 1 comprises a grinding chamber 16 intended to receive a material to be ground having an average initial size.
  • the device 1 also comprises a rotor 4 mounted in the chamber 16 so as to rotate about an axis 40.
  • the rotor 4 extends axially along the axis 40 and comprises a plurality of blades 41 extending radially, perpendicularly to axis 40.
  • the rotor 4 is configured to grind the material when in rotation.
  • the rotor 4 is configured vertically in the grinding chamber 16 and has a height H R.
  • the blades 41 extend from a hub 42.
  • the rotor 4 is mounted integrally (possibly removably) on a shaft 43 which is rotatable by a drive mechanism (not shown).
  • the blades 41 extend radially, that is to say in a direction substantially perpendicular to the axis 40.
  • the device 1 also comprises a screen 20 mounted around the rotor 4.
  • the screen 20 is configured to classify and / or fractionate the material crushed by the rotor 4.
  • the screen 20 is advantageously mounted to rotate around the axis 40.
  • the screen 20 is mounted rotatably concentric with the axis 40.
  • the screen 20 is supported by a base 24 rotatable by a drive mechanism (not shown).
  • the drive mechanism driving the screen 20 may be the same as that driving the rotor 4, or may be different.
  • the figure 2 shows a perspective view and the figure 3 shows a side view of the screen 20, according to a preferred embodiment.
  • the screen 20 is of cylindrical shape and comprises a plurality of openings 21 distributed approximately equally along the periphery of the screen 20. Each of the openings 21 extends substantially parallel to the axis 40. According to a preferred form, the height H o of the openings 21 is substantially equal to the height Ht of the screen 20.
  • the width L o of the openings 21 is between 1 mm and 20 mm.
  • the rotation of the rotor 4 and the screen 20 is adjustable so as to achieve a speed difference device between the rotor 4 and the screen 20 which is between 100 m / s and 400 m / s. This combination makes it possible to reduce the average initial size of the ground material by a factor ranging from 5 to 20 times, depending on the difference in peripheral speed and the width L o of the openings 21.
  • the width L o of the openings 21 can be between 4 mm and 8 mm.
  • the width L o of the openings 21 is therefore much greater than the openings of a static screen used in a conventional hammer milling device.
  • the figure 4 shows a cross-sectional view (i.e., along the plane defined by 30 in the figures 1 and 3 ), according to one embodiment.
  • the figure 5 shows a view in cross section of a portion of the screen 20 of the figure 4 .
  • the thickness and of the screen 20 can be chosen as a function of the width L o of the openings 21 so as to obtain an impact effect on the particles of the material.
  • the screen 20 has a thickness and substantially equal to the width L o of the openings 21.
  • the openings 21 can be oriented substantially radially.
  • the radial orientation of the openings 21 is illustrated by the coincidence of a radius 22 starting from the center of the screen 20 with the axis 23 of the opening 21.
  • the figure 6 shows a view in cross section of the screen 20, according to another embodiment.
  • the figure 7 show a view according a cross section of a portion of the screen 20 of the figure 6 .
  • the openings 21 are oriented with an angle of inclination ⁇ of between -60 ° and 60 °, relative to the radial direction of the screen 20. This configuration allows better separation between fine ground particles and coarse particles not still sufficiently ground.
  • the difference in peripheral speed between the rotor 4 and the screen 20 is between 200 m / s and 300 m / s.
  • the screen 20 is configured to rotate in the opposite direction than the direction of rotation of the rotor 4.
  • the peripheral speed of the rotor 4 is preferably of the order of 50 m / s to 200 m / s, and more advantageously from 150 m / s to 200 m / s.
  • the peripheral speed of the screen 20 is preferably of the order of 20 m / s to 200 m / s, and more advantageously from 50 m / s to 150 m / s.
  • the figure 8 shows a cross-sectional view of the screen 20 and the rotor 4, according to one embodiment.
  • the distance D p between the distal end 411 of the blades 41 of the rotor and the internal diameter of the screen 20 should be as small as possible for optimal fractionation of the material crushed by the rotor 4, but while avoiding causing local heating .
  • This distance D p is also a function of the size of the unmilled particles.
  • the distance D p between the distal end of the blades 41 and the internal radial dimension Dt of the screen 20 is between 0.5 mm to 5 mm.
  • the direction of rotation of the rotor 4 is indicated by the empty arrow and the direction of rotation of the screen 20 is indicated by the solid arrow.
  • the screen 20 can take another shape than the cylindrical shape illustrated. It is indeed possible that the screen 20 is conical, U-shaped or any other suitable shape.
  • the rotor 4 can also have a configuration which differs from that illustrated.
  • the rotor 4 may comprise two discs at the two ends of the hub 42 and between which blades extend.
  • the axial dimension (height) Ht of the screen 20 is substantially equal to half the radial dimension (diameter) Dt of the screen 20 or substantially equal to the radial dimension Dt of the screen 20.
  • the axial dimension Ht of the screen 20 can be substantially equal to the height H R of the rotor 4, smaller or larger.
  • the grinding device 1 of the invention makes it possible to obtain the following advantages, compared with a conventional hammer grinding device, in particular, a significant reduction in the temperature of the product at the outlet of the process; an interesting increase in product flow, in particular thanks to the absence of risk of clogging of the rotating drum with large openings; and the variation in the rotation speed of the drum also makes it possible to positively influence the width of the size distribution of the ground particles.
  • the proposed grinding device 1 allows the adjustment of more parameters than in the case of a traditional mill, without having to intervene mechanically on the mill by changing parts. Indeed, by playing on the speed of rotation of the rotor 4 and the screen 20, thus that on their respective direction of rotation, different phenomena can be created and in doing so, different grinding results can be obtained.
  • the rotating screen 20 can in particular either generate a suction effect, or push the large particles towards the rotor 4 or cause additional collisions with the product particles, depending on the choice of the direction of rotation, the size of the openings 21 and the angle of inclination ⁇ of the openings 21.
  • the openings 21 of the rotating screen 20 are generally rather large compared to the openings of a traditional screen.
  • the opposite rotation of the screen 20 relative to the rotor 4 produces a dynamic reduction effect on the size of the openings 21.
  • the openings 21 then operate as if they had a (dynamic) size smaller than their effective size.
  • the effect of dynamic reduction of the size of the openings 21 also makes it possible to repel and / or keep large particles in the grinding zone (grinding chamber 16)
  • the effect of dynamic reduction of the size of the openings 21 also makes it possible to multiply the number of collisions between the particles, thus making it possible to obtain sizes of ground particles even finer than in the absence of this effect.
  • the dynamic reduction effect depends on the direction of rotation of the screen 20, the size of the openings 21 and the angle ⁇ of the openings 21, knowing that the relative speeds between the screen 20 and the rotor 4 are much higher than in ordinary mills.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Crushing And Pulverization Processes (AREA)

Claims (12)

  1. Mahlvorrichtung (1) zur Durchführung eines Mahlvorgangs, die Vorrichtung umfassend:
    eine Mahlkammer (16) zur Aufnahme eines zu mahlenden Materials, mit einer durchschnittlichen Ausgangsgröße;
    einen Rotor (4), der drehbar um eine Achse (40) in der Mahlkammer (16) montiert ist; und umfassend eine Vielzahl von Blättern (41), die sich radial zur Achse (40) ausbreiten; und
    ein Sieb (20), der eine Vielzahl von Öffnungen (21) aufweist, und
    konfiguriert ist, um das vom Rotor (4) zerkleinerte Material aufzuteilen und/oder zu klassifizieren;
    dadurch gekennzeichnet, dass
    das Sieb (20) um den Rotor (4) herum drehbar um die Achse (40), in entgegengesetzter Richtung zur Drehrichtung des Rotors (4) gelagert ist;
    dass jede der Öffnungen (21) eine Höhe (Ho) hat die sich parallel zur Achse (40) erstreckt und eine Breite die sich senkrecht zur Achse (40) erstreckt und zwischen 1 mm und 20 mm beträgt;
    und dass die Rotation des Rotors (4) und die des Siebes (20) einstellbar ist, so dass eine periphere Geschwindigkeitsdifferenz zwischen Rotor (4) und dem Sieb (20) bereitgestellt wird, die zwischen 100 m/s und 400 m/s beträgt, so dass die durchschnittliche Ausgangsgröße des Mahlgutes um den Faktor 5 bis 20 reduziert wird.
  2. Vorrichtung nach Anspruch 1, wobei die Breite der Öffnungen (21) zwischen 4 mm und 8 mm liegt.
  3. Vorrichtung nach Anspruch 1 oder 2, wobei das Sieb (20) eine Dicke (et) beinhaltet, die im Wesentlichen der Breite (L0) der Öffnungen (21) entspricht.
  4. Vorrichtung nach einem der Ansprüche 1 bis 3, bei der die Höhe (H0) der Öffnungen (21) im Wesentlichen der axialen Abmessung (Ht) des Siebes (20) entspricht.
  5. Vorrichtung nach Anspruch 4, wobei die axiale Abmessung (Ht) des Siebes (20) im Wesentlichen der halben radialen Abmessung (Dt) des Siebes (20) oder der radialen Abmessung (Dt) des Siebes (20) entspricht.
  6. Vorrichtung nach einem der Ansprüche 1 bis 5, wobei die Öffnungen (21) im Wesentlichen radial ausgerichtet sind.
  7. Vorrichtung nach Anspruch 6, wobei die Öffnungen (21) in einem Neigungswinkel (β) der zwischen -60' und 60' bezüglich der radialen Richtung des Siebes (20) liegt, ausgerichtet sind.
  8. Vorrichtung nach einem der Ansprüche 1 bis 7, wobei das Sieb (20) so konfiguriert ist, dass es sich in der gleichen Richtung dreht wie der Rotor (4) oder in der entgegengesetzten Richtung.
  9. Vorrichtung nach Anspruch 8, wobei die Umfangsgeschwindigkeit des Rotors (4) in der Größenordnung von 50 m/s bis 200 m/s liegt und bevorzugterweise zwischen 150 m/s bis 200 m/s liegt.
  10. Vorrichtung nach Anspruch 8 oder 9, wobei die Umfangsgeschwindigkeit des Siebes (20) im Bereich von 20 m/s bis 2O0 m/s liegt, und bevorzugterweise zwischen 50 m/s bis 150 m/s liegt.
  11. Vorrichtung nach einem der Ansprüche 8 bis 10, bei der der Unterschied in der Umfangsgeschwindigkeit des Rotors (a) und des Siebes (20) zwischen 200 und 300 m/s liegt.
  12. Vorrichtung nach einem der Ansprüche 1 bis 11,wobei der Abstand (Dp) zwischen den distalen Spitzen der Blätter (41) und der radialen Abmessung (Dt) im Inneren des Siebes (20) zwischen 0,5 mm und 5 mm liegt.
EP18200085.1A 2017-11-17 2018-10-12 Zerkleinerungsvorrichtung, die einen hohen zerkleinerungsdurchsatz erlaubt sowie eine variation der grössenverteilung der zerkleinerten partikel Active EP3485975B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH01394/17A CH714350A1 (fr) 2017-11-17 2017-11-17 Dispositif de broyage permettant un débit de broyage élevé et de varier la distribution de taille des particules broyées.

Publications (2)

Publication Number Publication Date
EP3485975A1 EP3485975A1 (de) 2019-05-22
EP3485975B1 true EP3485975B1 (de) 2020-04-29

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EP18200085.1A Active EP3485975B1 (de) 2017-11-17 2018-10-12 Zerkleinerungsvorrichtung, die einen hohen zerkleinerungsdurchsatz erlaubt sowie eine variation der grössenverteilung der zerkleinerten partikel

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US (1) US10926271B2 (de)
EP (1) EP3485975B1 (de)
CH (1) CH714350A1 (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110075979A (zh) * 2019-05-27 2019-08-02 张德书 一种中药材生产用多级粉碎装置
CN111298916A (zh) * 2019-11-20 2020-06-19 安徽瑞虎肥业有限公司 一种复合肥颗粒筛选装置
CN111957398A (zh) * 2020-08-13 2020-11-20 安徽天安生物科技股份有限公司 一种中药材粉碎机
CN112517189A (zh) * 2020-11-09 2021-03-19 枣庄鑫金山智能装备有限公司 一种分级自动化制砂机
CN112773771B (zh) * 2021-04-09 2021-06-29 江西津大制药有限公司 一种大七厘丸的粉碎筛选装置及其制备方法
CN113600306B (zh) * 2021-10-11 2022-04-15 邳州嘉非食品科技有限公司 一种用于大蒜粉加工的研磨筛选装置

Family Cites Families (6)

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Publication number Priority date Publication date Assignee Title
US1286831A (en) * 1918-02-23 1918-12-03 Sturtevant Mill Co Crushing-mill.
US3352500A (en) * 1964-10-07 1967-11-14 Bayer Ag Apparatus for the production of aqueous dispersions of solids insoluble in water
US3737110A (en) * 1965-05-03 1973-06-05 G Neidl Pump
US4487371A (en) * 1982-05-13 1984-12-11 Day Thomas E Comminution apparatus
JP3151703B2 (ja) * 1995-08-11 2001-04-03 深江パウテック株式会社 粒状体の解砕整粒装置および環状空間型スクリーン
JP3947913B2 (ja) * 2002-02-19 2007-07-25 株式会社サタケ 穀物の衝撃式粉砕装置

Non-Patent Citations (1)

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Title
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Publication number Publication date
CH714350A1 (fr) 2019-05-31
EP3485975A1 (de) 2019-05-22
US10926271B2 (en) 2021-02-23
US20190151859A1 (en) 2019-05-23

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