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EP0191696B1 - Dispositif de projection de particules solides pour broyeur centrifuge sous vide - Google Patents

Dispositif de projection de particules solides pour broyeur centrifuge sous vide Download PDF

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Publication number
EP0191696B1
EP0191696B1 EP86400256A EP86400256A EP0191696B1 EP 0191696 B1 EP0191696 B1 EP 0191696B1 EP 86400256 A EP86400256 A EP 86400256A EP 86400256 A EP86400256 A EP 86400256A EP 0191696 B1 EP0191696 B1 EP 0191696B1
Authority
EP
European Patent Office
Prior art keywords
wheel
curve
particles
channels
friction
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
Application number
EP86400256A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0191696A2 (fr
EP0191696A3 (en
Inventor
Gérard Sevelinge
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.)
Areva NP SAS
Original Assignee
Framatome SA
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 Framatome SA filed Critical Framatome SA
Priority to AT86400256T priority Critical patent/ATE46830T1/de
Publication of EP0191696A2 publication Critical patent/EP0191696A2/fr
Publication of EP0191696A3 publication Critical patent/EP0191696A3/fr
Application granted granted Critical
Publication of EP0191696B1 publication Critical patent/EP0191696B1/fr
Expired 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
    • B02C13/1807—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 the material to be crushed being thrown against an anvil or impact plate
    • B02C13/1835—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 the material to be crushed being thrown against an anvil or impact plate by means of beater or impeller elements fixed in between an upper and lower rotor disc
    • B02C13/1842—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 the material to be crushed being thrown against an anvil or impact plate by means of beater or impeller elements fixed in between an upper and lower rotor disc with dead bed protected beater or impeller elements

Definitions

  • the present invention relates to a device for projecting solid particles for a vacuum mill in which the particles to be ground are projected by centrifugal force onto an impact surface disposed inside a vacuum enclosure, in accordance with the preamble of the claim 1 FR-A-2 201 928).
  • a vacuum crusher comprises a closed enclosure that is resistant to pressure and evacuated and at the top of which is placed a distributing wheel driven in rotation at high speed.
  • the wheel is provided in its axis with a central feed chamber provided at its upper part with an axial orifice formed at the bottom of a hopper supplied with material to be ground by means of a metering device, for example screw, placed at the outlet of a supply chamber forming an airlock and which makes it possible to introduce the material into the vacuum enclosure.
  • the distributing wheel is also provided with a plurality of projection channels, the axes of which are centered in a median plane perpendicular to the axis and which open inwards into the supply chamber and outwards on the periphery of the wheel.
  • the material introduced by the metering device into the central feeding chamber is therefore driven by centrifugal effect in the channels and projected at the outlet of these on a set of plates forming targets and which are placed all around the wheel. , along the side wall of the enclosure.
  • the lower part of the latter is in the form of a hopper and collects the fine powder formed by the bursting of the grains of material thus projected onto the targets by the channels of the wheel.
  • a radial and tangential acceleration is created inside the channels, making it possible to obtain the desired speed at the outlet.
  • a contact effect between the particles and the wheel which depends on the speed of rotation and consequently a phenomenon of wear of the channels, in particular at the outlet of the wheel.
  • This abrasion phenomenon depends on the physical properties of the particles, but is always very important as soon as the ejection speed also becomes high, having regard to the high value of the particle-wheel contact effect and the relative speed of displacement of particles in the channels.
  • the subject of the invention is a new embodiment of a grinder wheel which makes it possible to remedy these drawbacks, by reducing the speed of movement of the particles in the projection channels while maintaining the same ejection speed.
  • the guide face of the particles in each channel has a positive, continuous curve, that is to say a curve winding in the same direction of rotation of the distributing wheel, and whose route judiciously calculated , as a function of the coefficients of friction of the materials in contact, achieves the attachment on this curve of a stable layer of self-protection constituted by the particles themselves, with automatic regeneration of said layer at the same time as its wear.
  • a cylindrical enclosure 1 with a vertical axis at the upper part of which is disposed a vertical duct of large section 2 having a branch on which is fixed a duct 3 connected to a vacuum pump not shown.
  • a duct 3 connected to a vacuum pump not shown.
  • hoppers 4 and 5 Inside the duct 2 are arranged hoppers 4 and 5.
  • the hopper 5 is connected to a vibrator 6.
  • a hopper 7 secured to a wheel 20 constituting the upper part of the rotor. This wheel is pierced with several radial direction channels such as 21 and 22 regularly distributed.
  • a target 8 is arranged, the impact surface of which is covered with a material resistant to wear and impact.
  • deflectors 9 fixed to a hopper which can be vibrating 10 whose role is to collect the crushed pulverulent material. to direct it towards the outlet 11 connected to a set of vacuum locks allowing the product to flow without breaking the vacuum in the enclosure.
  • the wheel 20 constituting the upper part of the rotor of the mill is secured to an elongated cylindrical tubular shaft 12.
  • This shaft 12, driven by a motor 13, is guided and supported by a set of bearings and stops 14.
  • the motor 13 makes it possible to drive the wheel 20 in rotation at very high speeds.
  • Fig. 2 there is shown on a larger scale the dispensing wheel 20 inside which are formed a supply chamber 23 and two channels 21 and 22 opening at their ends inwards into the supply chamber 23 and towards the outside on the periphery of the wheel by evacuation orifices 24 and 25.
  • the granular material penetrates into the feed chamber 23 and is projected outwards, by centrifugal effect passing through the channels 21 and 22.
  • the particles thus projected by the channels strike the target 8 and are reduced to a fine powder. .
  • the granular materials for example cement or pulverized coal, treated in centrifugal mills being fairly abrasive, we find in mills of this type used until now, a fairly rapid wear of the internal side wall of the projection channels, and in particular of the peripheral outlet orifice.
  • the invention makes it possible to avoid this wear phenomenon by giving the distribution channels a particular and determined curve.
  • the friction face of each channel, on which the grains are projected has a positive curve A, that is to say a curve which winds in the same direction m as the rotation of the distributing wheel 20 .
  • This curve A the layout of which is judiciously calculated, as a function of the coefficients of friction of the materials in contact, that is to say as a function of the material constituting the distributing wheel and of the particles to be projected, allows the attachment to this curve A a stable layer 30 (FIG. 3) constituted by the particles themselves, thus providing effective protection of the distributor wheel.
  • the distributing wheel 20 must rotate at a greater or lesser speed. But in all cases we will obtain the creation of a protective mattress, because the plating of the particles is independent of the speed of rotation of the wheel.
  • Self-protection of the channels is therefore carried out by the product itself, which avoids any abrasion phenomenon, while maintaining a sufficient speed of rotation of the distributing wheel to obtain the desired particle size.
  • a substantially flat or disk-shaped wheel it is also possible to use, for example, a hemispherical bowl, but the principle of tracing the channels remains the same to obtain the attachment of a film of particles to spray which serves as a protective layer for the channels and prevents abrasion by particles.
  • the number of ejection channels depends on the flow to be produced and on the diameter of the distributor wheel.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
  • Glanulating (AREA)
  • Disintegrating Or Milling (AREA)
EP86400256A 1985-02-15 1986-02-06 Dispositif de projection de particules solides pour broyeur centrifuge sous vide Expired EP0191696B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86400256T ATE46830T1 (de) 1985-02-15 1986-02-06 Festpartikel-schleudervorrichtung fuer zentrifugalzerkleinerer im vakuum.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8502234A FR2577445B1 (fr) 1985-02-15 1985-02-15 Dispositif de projection de particules solides pour broyeur centrifuge sous vide
FR8502234 1985-02-15

Publications (3)

Publication Number Publication Date
EP0191696A2 EP0191696A2 (fr) 1986-08-20
EP0191696A3 EP0191696A3 (en) 1987-12-23
EP0191696B1 true EP0191696B1 (fr) 1989-10-04

Family

ID=9316334

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86400256A Expired EP0191696B1 (fr) 1985-02-15 1986-02-06 Dispositif de projection de particules solides pour broyeur centrifuge sous vide

Country Status (9)

Country Link
US (1) US4682739A (zh)
EP (1) EP0191696B1 (zh)
CN (1) CN86100993B (zh)
AT (1) ATE46830T1 (zh)
AU (1) AU583088B2 (zh)
CA (1) CA1243992A (zh)
DE (1) DE3665990D1 (zh)
FR (1) FR2577445B1 (zh)
ZA (1) ZA86660B (zh)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2594048B1 (fr) * 1986-02-10 1988-05-27 Framatome Sa Roue de broyeur a projection sous vide.
FR2628007B1 (fr) * 1988-03-07 1993-09-17 Electricite De France Broyeur a percussion sous vide
US5860605A (en) 1996-10-11 1999-01-19 Johannes Petrus Andreas Josephus Van Der Zanden Method and device for synchronously making material collide
BE1011841A3 (fr) * 1998-03-17 2000-02-01 Magotteaux Int Ejecteur a une ou plusieurs poche(s).
DE102011054086B4 (de) * 2011-09-30 2013-05-23 Thyssenkrupp Polysius Ag Walzenmühle und Verfahren zur Zerkleinerung von sprödem Mahlgut
CN103348796B (zh) * 2013-07-17 2015-07-08 梁华安 旋轮斗抛射式离心扬泥机
PL3229968T3 (pl) 2014-12-09 2022-05-30 Frewitt Fabrique De Machines S.A. Układ i sposób rozdrabniania próżniowego
CN119303700B (zh) * 2024-10-22 2025-03-14 江苏山宝集团有限公司 复合制砂机及整形系统

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3174697A (en) * 1962-07-30 1965-03-23 Adams Engineering Impeller
FR2194132A5 (zh) * 1972-07-27 1974-02-22 Air Liquide
US3970257A (en) * 1972-10-05 1976-07-20 Macdonald George James Apparatus for reducing the size of discrete material
FR2347102A1 (fr) * 1976-04-07 1977-11-04 Planiol Rene Perfectionnements aux broyeurs centrifuges sous vide
FR2412348A1 (fr) * 1977-12-20 1979-07-20 Creusot Loire Surface d'impact pour un broyeur a projection sous vide
US4577806A (en) * 1983-11-18 1986-03-25 Acrowood Corporation Impeller assembly for an impact crusher
US4575014A (en) * 1984-06-27 1986-03-11 Rexnord Inc. Vertical shaft impact crusher rings
JPS6137629A (ja) * 1984-07-30 1986-02-22 Asahi Breweries Ltd 軽粉粒体処理装置における詰り防止方法及びその装置

Also Published As

Publication number Publication date
CN86100993B (zh) 1988-04-06
CA1243992A (en) 1988-11-01
FR2577445B1 (fr) 1988-05-27
ZA86660B (en) 1986-09-24
EP0191696A2 (fr) 1986-08-20
FR2577445A1 (fr) 1986-08-22
AU583088B2 (en) 1989-04-20
CN86100993A (zh) 1986-08-20
US4682739A (en) 1987-07-28
AU5295386A (en) 1986-08-21
DE3665990D1 (en) 1989-11-09
EP0191696A3 (en) 1987-12-23
ATE46830T1 (de) 1989-10-15

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