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EP0925114B1 - Broyeur centrifuge a bon rendement energetique - Google Patents

Broyeur centrifuge a bon rendement energetique Download PDF

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Publication number
EP0925114B1
EP0925114B1 EP96926296A EP96926296A EP0925114B1 EP 0925114 B1 EP0925114 B1 EP 0925114B1 EP 96926296 A EP96926296 A EP 96926296A EP 96926296 A EP96926296 A EP 96926296A EP 0925114 B1 EP0925114 B1 EP 0925114B1
Authority
EP
European Patent Office
Prior art keywords
rotatable
disc
chamber
grinder according
hammers
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
Application number
EP96926296A
Other languages
German (de)
English (en)
Other versions
EP0925114A1 (fr
Inventor
Rajendra P. Gupta
Grant W. Wood
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.)
Prosoya Inc
Original Assignee
Prosoya Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Prosoya Inc filed Critical Prosoya Inc
Publication of EP0925114A1 publication Critical patent/EP0925114A1/fr
Application granted granted Critical
Publication of EP0925114B1 publication Critical patent/EP0925114B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/14—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices
    • B02C13/18—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor
    • 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
    • B02C18/0084—Disintegrating by knives or other cutting or tearing members which chop material into fragments specially adapted for disintegrating garbage, waste or sewage
    • B02C18/0092—Disintegrating by knives or other cutting or tearing members which chop material into fragments specially adapted for disintegrating garbage, waste or sewage for waste water or for garbage
    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/14—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices
    • B02C2013/145—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with fast rotating vanes generating vortexes effecting material on material impact

Definitions

  • the present invention relates to a centrifugal grinder for grinding solids in liquids into a resulting solid liquid slurry, of the type comprising a housing having a circular screen wall dividing the housing into a first chamber and a second chamber.
  • US 2 738 930 and US 2 738 931 disclosed dispersion apparatus in which a preliminary comminuting system is followed by a plurality of dispersion systems.
  • US 2 519 198 describes coffee grinding or comminuting machines having a plurality of rotating elements.
  • US 3 993 791 discloses continuous lautering apparatus in which a series of continuously decanting centrifuges and an equal number of reslurry stations are provided.
  • FR 2 171 671 discloses a grinder in which hammers are provided on rotatable discs at their perimeters.
  • FR 2 112 030 also discloses a grinder in which cutters are provided on one side of a rotatable disc and hammers are on the other side of said disc.
  • the grinders disclosed in the aforesaid patents have a screened wall or walls to define first and second chambers. Both grinders, however, could create a vortex in liquids and require high starting torques.
  • a centrifugal grinder of the aforesaid type characterised by a first rotatable circular disc in the first chamber substantially conforming to the size of the first chamber, dividing the first chamber into a first region and a second region and being rotatable about a central axis; cutters located in the first region and attached to a first side of the first rotatable disc near but inside its perimeter; hammers located in the second region and attached to a second side of the first rotatable disc near but inside its perimeter; an inlet connection to the first chamber for introducing the solids in liquids to the first region on the first side of the disc; an outlet connecting to the second chamber for discharging the solid-liquid therefrom; and a motor mechanically connected to the first rotatable disc so as to drive said first rotatable disc.
  • the present invention eliminates deficiencies of a hammermill and provides a highly cost effective method of grinding for general purpose use, such as dry grinding of grains, spices, minerals and other food and non-food products. It is also suitable for grinding solids in liquids such as ordinary, choked, flooded and airless grinding. This is achieved by locating the hammering elements only in the vicinity of the impacting surface rather than using the whole rotating element as a hammer.
  • the starting and running torque requirement of the drive motor is greatly reduced and energy use efficiency is improved.
  • the motor torque requirement and energy efficiency is further improved by dividing the milling regions into two or more sections. This division also results in good control over the particle size distribution of the grind and eliminates the need for multiple mills or multiple passes to achieve good results.
  • FIG. 1 A schematic representation of a grinder according to one embodiment of the present invention is shown in Figure 1.
  • the grinder includes a housing ( 10 ) which is provided with an inlet ( 12 ) and an outlet ( 14 ).
  • the housing is cylindrical in shape in cross section and is divided into two chambers ( 16 ), ( 18 ), by a screened wall ( 20 ).
  • a disc plate ( 22 ) is in the first chamber ( 16 ) and is attached on an axle ( 24 ) which is in turn adapted to be rotated at high speed by a motor ( 26 ).
  • the disc plate ( 22 ) has two or more cutter elements ( 28 ) attached to its upper side and two or more hammer elements ( 30 ) attached to its lower side. The cutter and hammer elements are attached to the disc plate ( 22 ) near its circumference.
  • the disc plate is provided with a few tapered holes ( 32 ) which are too small for the unground solids to pass through. These holes improve circulation of ground product below the plate. They are particularly beneficial when solids are to be ground in the presence of a liquid.
  • Solids or solids in liquids are introduced into the grinder through the inlet ( 12 ).
  • the solids are centrifugally thrown out towards the screen wall in the path of the spinning cutters ( 28 ) which chop down the solids into small pieces.
  • the small solid pieces then enter the lower region where spinning hammers ( 30 ) grind them to a particulate size which is a function of the holes size in screen.
  • the ground solids suspended in the liquid are removed through outlet ( 14 ).
  • the invention uses the cutter and hammer elements attached on a horizontal circular plate.
  • the milling chamber is divided into two regions.
  • V2 ⁇ D*D(h1+h2)/4
  • V1/V2 4. t/D.
  • This ratio then roughly defines the ratio of the strength of the vortex for the two mills without the disc plate.
  • the presence of the disc plate greatly reduces the swept volume available for vortex formation for the present invention - the inlet can only see the swept volume V1' above the disc plate.
  • the grinder of the invention therefore has a very small vortex and as a result extremely small suction for air to get into it. If this small vortex is still problematic, it could be further reduced by inserting a vortex-cross in the inlet of the grinder.
  • K is a proportionality constant.
  • the grinder has a single impeller mounted on a drive shaft 50 of a motor and is surrounded by a fixed cylindrical screen 52.
  • the impeller has multiple grinding stages separated by discs 54 and 56 concentric with the shaft.
  • the grinding elements like cutters and hammers, are symmetrically mounted on the discs. As the solid such as beans gets crushed or chopped to a certain size by one stage of the grinding, they progress to the next finer stage of grinding or chopping through the opening between the discs and the screen.
  • the section of the screen surrounding the final stage of the grinder has perforations that allow the finely ground solids to exit the grinder.
  • the grinder screen may be perforated everywhere, it is undesirable to do so for two reasons: a) the slurry flow between stages is enhanced if the water cannot flow out of the screen in the earlier stages of grinding, and b) it costs money to make perforations in any material, i.e., fewer the perforations, cheaper the screen.
  • the discs are provided with holes which are too small for solids larger than a certain size to go through.
  • the grinder of the present invention produces a more uniform particle size distribution in the grind than the prior art and reduces energy and power requirement in grinding a material to desired fineness.
  • the grinding elements last longer and are economical to manufacture.
  • the grinder of the invention also produces higher yield and quality of the end product. It is adaptable to dry grinding of grains, spices, minerals, and other food and non-food products; and is suitable for ordinary, choked, flooded, and airless grinding.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Centrifugal Separators (AREA)

Claims (11)

  1. Broyeur centrifuge pour broyer des solides dans des liquides pour obtenir une suspension solide-liquide résultante, comportant
    un boítier (10) ayant une paroi (20) formant écran circulaire divisant le boítier en une première chambre (16) et une seconde chambre (18) ; caractérisé par
    un premier disque (22) circulaire pouvant tourner dans la première chambre (16) se conformant sensiblement à la dimension de la première chambre, divisant la première chambre en une première région et une seconde région et pouvant tourner par rapport à un axe (24) central ;
    des couteaux (28) situés dans la première région et fixés à un premier côté du premier disque (22) pouvant tourner à proximité de sa périphérie mais à l'intérieur de celle-ci ;
    des marteaux (30) situés dans la seconde région et fixés au second côté du premier disque (22) pouvant tourner à proximité de sa périphérie mais à l'intérieur de celle-ci ;
    une entrée (12) pour la connexion à la première chambre (16) pour l'introduction des solides dans des liquides dans la première région sur le premier côté du disque (22) ;
    une sortie (14) pour une connexion à la seconde chambre (18) pour un déchargement de celle-ci de la suspension solide-liquide ; et
    un moteur (26) connecté mécaniquement au premier disque (22) pouvant tourner de manière à entraíner le premier disque pouvant tourner.
  2. Broyeur suivant la revendication 1, comportant en outre
    un second disque (56) circulaire pouvant tourner parallèle au second côté du premier disque (22) pouvant tourner et adjacent à celui-ci, et pouvant tourner par rapport à l'axe (50) ;
    le second disque (56) circulaire pouvant tourner se conformant sensiblement à la dimension de la première chambre et ayant les marteaux qui sont connectés à son premier côté à proximité de sa périphérie mais à l'intérieur de celle-ci ; et
    des marteaux de broyage fin fixés sur son second côté à proximité de sa périphérie mais à l'intérieur de celle-ci.
  3. Broyeur centrifuge suivant la revendication 1 ou la revendication 2, dans lequel le premier disque (22) circulaire pouvant tourner comporte des trous (32) en son sein dont la dimension est plus petite que celle des solides non broyés.
  4. Broyeur suivant la revendication 2, dans lequel les premier et second disques pouvant tourner comportent des trous en leur sein dont les dimensions sont plus petites que celles des solides non broyés.
  5. Broyeur suivant la revendication 4, dans lequel la paroi formant écran est de forme cylindrique définissant la première chambre en son sein et comporte des trous d'écran.
  6. Broyeur suivant la revendication 5, dans lequel les trous d'écran sont uniquement à proximité des marteaux à broyage fin.
  7. Broyeur suivant la revendication 5, dans lequel le second disque circulaire pouvant tourner est plus grand en diamètre que le premier disque circulaire pouvant tourner.
  8. Broyeur suivant la revendication 4, dans lequel la paroi d'écran est de forme conique définissant la première chambre en son sein et comporte des trous d'écran.
  9. Broyeur suivant la revendication 8, dans lequel le second disque circulaire pouvant tourner est plus grand en diamètre que le premier disque circulaire pouvant tourner.
  10. Broyeur suivant la revendication 8, dans lequel les couteaux sur le premier disque pouvant tourner, les marteaux sur les premier et second disques pouvant tourner et les marteaux à broyage fin sur le second disque pouvant tourner sont fixés à leurs disques circulaires pouvant tourner respectifs suivant des angles pour se conformer sensiblement à la forme conique de la première chambre.
  11. Broyeur suivant la revendication 10, dans lequel les trous d'écran sont uniquement à proximité des marteaux à broyage fin.
EP96926296A 1996-08-12 1996-08-12 Broyeur centrifuge a bon rendement energetique Expired - Lifetime EP0925114B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CA1996/000544 WO1998006497A1 (fr) 1996-08-12 1996-08-12 Broyeur centrifuge a bon rendement energetique

Publications (2)

Publication Number Publication Date
EP0925114A1 EP0925114A1 (fr) 1999-06-30
EP0925114B1 true EP0925114B1 (fr) 2001-06-27

Family

ID=4173165

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96926296A Expired - Lifetime EP0925114B1 (fr) 1996-08-12 1996-08-12 Broyeur centrifuge a bon rendement energetique

Country Status (8)

Country Link
EP (1) EP0925114B1 (fr)
JP (1) JP2000516134A (fr)
BR (1) BR9612694A (fr)
CA (1) CA2261665C (fr)
DE (1) DE69613596T2 (fr)
DK (1) DK0925114T3 (fr)
ES (1) ES2158331T3 (fr)
WO (1) WO1998006497A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE516575C2 (sv) * 2000-06-30 2002-01-29 Gunnar Oehrn Anordning för finfördelning av avfall
CN103127991B (zh) * 2013-02-02 2014-10-22 中国农业科学院烟草研究所 一种研磨机及其研磨方法
CN105903526B (zh) * 2013-03-21 2018-07-03 青岛智信生物科技有限公司 一种研磨机的研磨方法
CN104174477B (zh) * 2014-08-15 2017-04-19 湖南三德科技股份有限公司 沉降收集式制样粉碎机
RU185130U1 (ru) * 2016-11-21 2018-11-22 Государственное бюджетное образовательное учреждение высшего образования Нижегородский государственный инженерно-экономический университет (НГИЭУ) Измельчитель
CN109482292B (zh) * 2018-11-06 2020-11-20 江苏科鼐生物制品有限公司 一种化工物料的处理装置及其工作方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1977771A (en) * 1932-10-15 1934-10-23 Mcmahan Stanley Pulverizer
FR2112030A1 (fr) * 1970-07-10 1972-06-16 Zanetti Jeanne
FR2171671A5 (fr) * 1972-02-04 1973-09-21 Michel Albert
DE7827589U1 (de) * 1978-09-15 1979-01-04 Ismar, Theodor, 5000 Koeln Maschine zum zerkleinern von restbrot
DE9309448U1 (de) * 1993-06-25 1994-11-03 Gebrüder Bauermeister & Co Verfahrenstechnik GmbH & Co, 22844 Norderstedt Prallmühle für ölhaltige Samenkerne, insbesondere Kakaokerne

Also Published As

Publication number Publication date
DE69613596T2 (de) 2002-04-18
BR9612694A (pt) 2001-01-02
DE69613596D1 (de) 2001-08-02
ES2158331T3 (es) 2001-09-01
CA2261665A1 (fr) 1998-02-19
DK0925114T3 (da) 2001-09-03
CA2261665C (fr) 2001-11-06
EP0925114A1 (fr) 1999-06-30
WO1998006497A1 (fr) 1998-02-19
JP2000516134A (ja) 2000-12-05

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