EP0233812B1 - Schleuderrad für unter Vakuum arbeitenden Prallbrecher - Google Patents

Schleuderrad für unter Vakuum arbeitenden Prallbrecher Download PDF

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Publication number
EP0233812B1
EP0233812B1 EP87400175A EP87400175A EP0233812B1 EP 0233812 B1 EP0233812 B1 EP 0233812B1 EP 87400175 A EP87400175 A EP 87400175A EP 87400175 A EP87400175 A EP 87400175A EP 0233812 B1 EP0233812 B1 EP 0233812B1
Authority
EP
European Patent Office
Prior art keywords
wheel
particles
deflectors
distributor
plane
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
EP87400175A
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English (en)
French (fr)
Other versions
EP0233812A3 (en
EP0233812A2 (de
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 AT87400175T priority Critical patent/ATE67691T1/de
Publication of EP0233812A2 publication Critical patent/EP0233812A2/de
Publication of EP0233812A3 publication Critical patent/EP0233812A3/fr
Application granted granted Critical
Publication of EP0233812B1 publication Critical patent/EP0233812B1/de
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
    • 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 vacuum projection mill wheel in which the particles to be ground are projected by centrifugal force onto an impact surface disposed inside a vacuum enclosure, as referred to in the preamble of the claim 1 (EP-A 101277)
  • 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.
  • the bearing faces of the particles formed by the bottom of said channels are therefore protected by a layer of particles, but the extreme point of the bottom of these channels located at the ejection orifice is a vulnerable point that should also be protected.
  • the subject of the invention is therefore a new embodiment of a grinder wheel enabling these drawbacks to be remedied and having the characteristics of the characterizing part of claim 1.
  • the distributing wheel comprises, downstream of each outlet orifice of the channels with respect to the direction of projection of the particles, an element formed by a pallet integral in rotation with the wheel and making it possible on the one hand to create, at the end of the guide face of each channel, a protective mattress formed by the particles themselves and extending the stable layer of self-protection, and on the other hand to cancel the effort of contact between the particles and the wheel before the ejection and the projection of said particles on the target.
  • FIG 1 we see 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. Inside the duct 2 are arranged hoppers 4 and 5. The hopper 5 is connected to a vibrator 6.
  • a hopper 7 supplied with material to be ground and whose axial outlet orifice opens into a central supply chamber 21 of a distributing wheel 20 constituting the upper part of the rotor of the mill.
  • This wheel is pierced with several radial direction channels such as 22 and 23 regularly distributed.
  • a target 8 is arranged, the impact surface of which is covered with a material resistant to wear and impact.
  • 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 21 and two channels 22 and 23 opening at their ends inwardly into the supply chamber 21 and outwards on the periphery of the wheel through discharge orifices 24 and 25.
  • the hopper 7 is arranged in the axis of the dispensing wheel 20 and opens into the supply chamber 21 of said wheel.
  • This distributing wheel 20 is constituted by a cover 26 and by a bottom 27 in the form of a circular plate, these two elements being integral with one another and driven in rotation at very high speeds by the shaft 12.
  • the granular material penetrates into the feed chamber 21 and is projected outward, by centrifugal effect passing through the channels 22 and 23.
  • 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 the mills a fairly rapid wear of the internal side wall of the projection channels, and also from the end of the channels to the level of the peripheral outlet orifice.
  • the guide face 22a and 23a of the particles in each of said channels has a positive curve A (FIG. 3), that is to say a curve s' winding in the same direction of rotation of the wheel distributor 20, and the layout of which, judiciously calculated, as a function of the coefficients of friction of the materials in contact, achieves the attachment on this curve A of a stable layer 28 (FIG. 5) of self-protection constituted by the particles themselves , with automatic regeneration of said layer at the same time as its wear.
  • this self-protection layer 28 has an almost zero thickness at the end 22b, 23b of each of the channels, so that this end constitutes a vulnerable zone undergoing significant wear.
  • the invention makes it possible to avoid this wear phenomenon in this area.
  • the distributor wheel 20 is provided at the end of each channel 22 and 23, at the outlet orifices 24 and 25, with an element designated as a whole by the reference 30.
  • This element 30 is constituted by a pallet integral with the wheel 20 or attached to it.
  • the pallet 30 is constituted by an extension of the external lateral face of the bottom 27 so as to form a vertical wall 31 oriented along a plane perpendicular to the plane of the distributing wheel 20.
  • This vertical wall 31 is therefore arranged downstream of the orifice 24 and leave a cavity 32 behind the end 22b.
  • first deflector 33 formed by a small independent plate applied against the vertical wall 31.
  • the upper part of this first deflector 33 has the shape of a triangle whose apex 33a is directed towards the high and overflows above the vertical wall 31.
  • a second deflector 34 formed by a small independent plate is mounted inside the cavity 32, said second deflector 34 being attached to the first deflector 33.
  • the upper part of this second deflector 34 also has the shape of 'a triangle whose apex 34a is directed upwards and whose height is less than the height of the tip 33a of the first deflector.
  • the lateral faces of the two deflectors 33 and 34 have a curvature determined so that the center of said curvatures coincides with the center O of the distributing wheel 20 on the axis of rotation.
  • the vertices 33a and 34a, respectively of the deflectors 33 and 34 are arranged on the same radius OX passing through the center O of the wheel 20, as seen on Figure 3.
  • the lateral faces of the two deflectors 33 and 34 can also be of planar shape and perpendicular to the radius OX.
  • the pallet 30 placed at the outlet of the channel 23 is identical to the pallet placed at the outlet of the channel 22.
  • the vertices 33a and 34a of the deflectors 33 and 34 of each pallet are located on the same diameter XOX ′ of said wheel 20.
  • the distributing wheel 20 includes means 40 (FIG. 2) for adjusting the starting point of the stable self-protection layer 28 formed by the particles in each channel 22 and 23.
  • These means 40 consist of a disc 41 secured in rotation with the bottom 27 and placed in the axis of the wheel 20 below the supply chamber 21. This disc 41 has in relief on its upper face small studs (42, 43, ...) in shape of circular crown sectors.
  • the number of small studs corresponds to the number of channels formed in the distributing wheel 20.
  • the disc 41 therefore comprises two small studs 42 and 43 diametrically opposite, the small stud 42 corresponding to channel 22 and the small pad 43 corresponding to channel 23.
  • the disc 41 is adjustable in rotation so as to modify the position of the small studs 42 and 43 relative to the inlet of the channels 22 and 23, which makes it possible to adjust the starting point of the self-protection layer in each channel in function of the particle size of the material to be treated and the coefficients of friction of the materials in contact.
  • the particles introduced into the feed chamber 21 also form, during the operation of the mill, an embankment of particles 50 on the second deflector 34 of each pallet 30 which extends the curve B of the layer 28.
  • the length of this slope 50 depends on the length of the second deflector 34 which is determined so that the thickness of the particle self-protection layer at the end 22b, 23b of each channel 22, 23 is sufficient to avoid wear of this end.
  • the slope 50 has the shape of a dihedral tilted upwards determining two half-planes 50a and 50b of QT intersection (FIG. 6).
  • a second slope 51 of particles is also formed, above the slope 50.
  • the slope 51 has the shape of a dihedral upwardly inclined determining two half-planes 51a and 51b of intersection TS.
  • the half-plane TSV of the dihedral 51 determines a boundary layer in such a way that the component of its normal protection in the plane of the wheel 20 is in a direction substantially opposite to the direction of rotation ⁇ of said wheel.
  • the particles arrive at the point T on the half-plane TSV of the slope 51. Since the component of the normal of the half-plane TSV in projection in the plane of the wheel 20 is in a direction substantially opposite to the direction of rotation of said wheel, the contact force between the particles and the wheel in the TSV half-plane is canceled, the particles leave said wheel which does not cause wear of these parts.
  • the particle entrainment speed obtained by the rotation of the distributing wheel 20 being clearly greater than the relative speed of said particles in the TSV plane, said relative speed is therefore negligible compared to said entrainment speed, so that at the exit of the TSV plane the particles resume a horizontal trajectory and are projected on the target 8.
  • the distributing wheel 20 must rotate at a greater or lesser speed. But in all cases, the creation of a protective mattress will be obtained, because the plating of the particles is independent of the speed of rotation of the wheel.
  • the deflectors 33 and 34 of the pallets 30 can be mounted adjustable transversely and / or vertically to modify, as a function of the coefficients of friction of the materials in contact and the particle size of the material to be treated, the geometry of the slopes 50 and 51 and the position of the radius OX and / or OX ′ with respect to the ends 22b, 23b of the channels 22 and 23.
  • the deflectors 33 and 34 are easily replaceable and can, for example, be made of very hard and abrasion-resistant material.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Walking Sticks, Umbrellas, And Fans (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Crushing And Grinding (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Disintegrating Or Milling (AREA)

Claims (12)

1. Schleuderrad für unter Vakuum arbeitenden Prallbrecher, das dazu dient, ein granulatartiges Material in Drehung zu versetzen zum Schleudern mit großer Geschwindigkeit auf eine Prallplatte (8), mit einem Deckel (26) und einem Boden (27), zwischen denen eine Zuführkämmer (21) und eine Mehrzahl von Kanälen (22, 23) vorgesehen sind, die gemäß einer Richtung senkrecht zur Achse des Rades (20) ausgerichtet sind und nach außen durch Austrittsöffnungen (24, 25) münden, wobei die Führungsseite (22a, 23a) der Kanäle jeweils eine Kurve A aufweisen, deren Bahn in Abhängigkeit der Reibungskoeffizienten der Materialien in Berührung berechnet ist, um das Anhängen auf dieser Kurve A einer stabilen Selbstschutzschicht (28) zu erzeugen, gebildet aus den Teilchen selbst, und wobei jede Austrittsöffnung (24, 25) der Kanäle (22, 23) bezüglich der Schleuderrichtung der Teilchen ein durch eine Schaufel (30) gebildetes Element aufweist, das drehverbunden ist mit dem Rad (20) und senkrecht ist zur Ebene des Rades (20), dadurch gekennzeichnet, daß die Schaufel (30) mit Einrichtungen (33, 34) versehen ist, die über das Ende (22b, 23b) der Führungsseite (22a, 23a) eines jeden Kanals (22, 23) hinaus die Schrägenbildung (50, 51) des Selbstschutzes, deren Geometrie und Neigung bestimmt werden in Abhängigkeit des Reibungskoeffizienten der in Berührung befindlichen Materialien und aus der Korngrößenbestimmung des zu behandelnden Materials sicherstellt, wobei die Schrägen einerseits auf der Höhe des Endes (22b, 23b) der Führungsseite (22a, 23a) eines jeden Kanals (22, 23) die Bildung einer Schutzmatte erlauben, die durch die Teilchen selbst gebildet werden, und die stabile Selbstschutzschicht (28) verlängern, und andererseits erlauben, die Berührungskraft zwischen den Teilchen und dem Rad (20) vom Auswurf und Schleudern der Teilchen auf die Prallplatte (8) zu annulieren.
2. Rad nach Anspruch 1, dadurch gekennzeichnet, daß die Schaufeleinrichtungen (30) für die Bildung der Schrägen (50, 51) gebildet werden aus zwei nebeneinandergesetzten Ablenkern (33, 34) von dreieckiger Form und unterschiedlichen Höhen.
3. Rad nach Anspruch 2, dadurch gekennzeichnet, daß beim Schleudern in eine Ebene des Verteilungsrades (20), die Spitzen (33a, 34a) bzw. die dreieckförmigen Ablenker (33, 34) auf einem selben Radius OX sind, der durch das Zentrum O des Rades geht und stromab des Endes (22b, 23b) der Führungsseite (22a, 23a) eines jeden Kanals (22, 23) bezüglich der Richtung sind, die von den Teilchen im Inneren des Verteilungsrades (20) genommen wird.
4. Rad nach Anspruch 2 oder 3, dadurch gekennzeichnet, daß die seitlichen Seiten der dreieckförmigen Ablenker (33, 34) eine bestimmte Kurve aufweisen, deren Zentrum mit dem Zentrum O des Verteilerrades (20) auf der Drehachse liegt.
5. Rad nach Anspruch 2 oder 3, dadurch gekennzeichnet, daß die seitlichen Seiten der dreieckförmigen Ablenker (33, 34) von ebener Form sind und senkrecht sind zum Radius des Verteiler- bzw. Schleuderrades, das durch die Spitzen (33a, 34a) der Ablenker geht.
6. Rad nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Schrägen der Teilchen (50, 51), die durch die beiden Ablenker (33, 34) gebildet werden, übereinander angeordnet sind, und alle beide die Form eines Zweiflachs haben, der entsprechend zwei Halbebenen (50a, 50b - 51a, 51b) bestimmt, deren Kreuzungspunkte QT bzw. TS in einer Ebene angeordnet sind, die senkrecht zur Ebene des Schleuderrades (20) ist und durch die Spitzen (33a, 34a) der beiden dreieckförmigen Ablenker (33, 34) hindurchgehen.
7. Rad nach Anspruch 6, dadurch gekennzeichnet, daß die Halbebene (51a) der Schräge (51) eine stabile begrenzte Teilchenschicht bestimmt, dessen Komponente ihrer Senkrechten in der Projektion in die Ebene des Schleuderrades (20) in eine Richtung entgegen der Drehrichtung des Rades läuft.
8. Rad nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Schaufel (30) mit dem Boden (27) des Schleuderrades (20) verbunden oder hinzugebracht ist und die Spitzen (33a, 34a) der Ablenker (33, 34) nach oben bezüglich der Ebene des Rades gerichtet sind.
9. Rad nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Schaufel (30) mit dem Deckel (26) des Schleuderrades (20) verbunden oder hinzugebracht ist, und die Spitzen (33a, 34a) der Ablenker (33, 34) nach unten bezüglich der Ebene des Rades gerichtet sind.
10. Rad nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnert, daß die Querposition und/oder vertikale Position der Ablenker ( 33, 34 ) in Funktion der Korngrößenbestimmung des zu behandelnden Materials einstellbar sind.
11. Rad nach Anspruch 1, dadurch gekennzeichnet, daß das Schleuderrad (20) Einrichtungen (40) zum Einstellen des Anfangspunktes der stabilen Selbstschutzschicht (28) aufweist, gebildet durch die Teilchen in einem jeden Kanal (22, 23) in Abhängigkeit der Reibungskoeffizienten der Materialien in Berührung und der Korngrößenbestimmung des zu behandelnden Materials gebildet werdedn.
12. Rad nach Anspruch 11, dadurch gekennzeichnert, daß die Einrichtungen (40) gebildet werden aus einer Scheibe (41), die drehfest mit dem Schleuderrad (20) verbunden ist, und in die Achse des Rades unterhalb der Zuführkammer (21) angeorndet ist, wobei die Scheibe (41) vorspringend auf seiner Oberseite kleine Vorsprünge (42, 43, ....) in Form von kreisförmigen Kranzsektoren aufweist.
EP87400175A 1986-02-10 1987-01-26 Schleuderrad für unter Vakuum arbeitenden Prallbrecher Expired - Lifetime EP0233812B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87400175T ATE67691T1 (de) 1986-02-10 1987-01-26 Schleuderrad fuer unter vakuum arbeitenden prallbrecher.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8601774 1986-02-10
FR8601774A FR2594048B1 (fr) 1986-02-10 1986-02-10 Roue de broyeur a projection sous vide.

Publications (3)

Publication Number Publication Date
EP0233812A2 EP0233812A2 (de) 1987-08-26
EP0233812A3 EP0233812A3 (en) 1989-01-04
EP0233812B1 true EP0233812B1 (de) 1991-09-25

Family

ID=9331965

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87400175A Expired - Lifetime EP0233812B1 (de) 1986-02-10 1987-01-26 Schleuderrad für unter Vakuum arbeitenden Prallbrecher

Country Status (9)

Country Link
US (1) US4738403A (de)
EP (1) EP0233812B1 (de)
CN (1) CN1009439B (de)
AT (1) ATE67691T1 (de)
AU (1) AU594116B2 (de)
CA (1) CA1264555A (de)
DE (1) DE3773224D1 (de)
FR (1) FR2594048B1 (de)
ZA (1) ZA87911B (de)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8727231D0 (en) * 1987-11-20 1987-12-23 Impact Technology Ltd Machine for comminuting materials
US4923131A (en) * 1988-06-06 1990-05-08 Rossouw Pieter J Rotary impact crusher rotor
JP2936382B2 (ja) * 1994-11-28 1999-08-23 コトブキ技研工業株式会社 遠心破砕機及び破砕原料供給口の補強材
US5860605A (en) 1996-10-11 1999-01-19 Johannes Petrus Andreas Josephus Van Der Zanden Method and device for synchronously making material collide
NZ328061A (en) * 1997-06-11 1998-11-25 Svedala Barmac Ltd Rotary mineral crusher with focused output of the rotor includes a tip component engageable via a holder to define a transverse weir that is not symmetrical in a plane transverse to the radial direction
NZ328062A (en) * 1997-06-11 1999-10-28 Svedala Barmac Ltd Rotary mineral breakers having a contoured bed and weir
US6405953B1 (en) 1999-07-30 2002-06-18 Impact Service Corporation Impeller shoe for an impact crusher
DE10057433A1 (de) * 2000-11-20 2002-05-23 Bhs Sonthofen Maschinen & Anlagenbau Gmbh Zweikammer-Schleudermühle
US6820735B1 (en) * 2002-07-02 2004-11-23 Src Innovations, Llc Bagging machine rotor tooth having a concave face
AU2003283954A1 (en) * 2002-12-06 2004-06-30 Cornerstone Technologies, L.L.C. High g mill in a blending and drying system
EP2666543B1 (de) * 2012-05-23 2020-04-08 Sandvik Intellectual Property AB Zufuhrrohr für Zerkleinerer mit vertikalem Welleneinschlag
EP2821141B1 (de) 2013-07-02 2016-10-12 Sandvik Intellectual Property AB VSI-Speisungsführungsfülltrichter-Verteilungsvorrichtung
CN110237898A (zh) * 2019-05-08 2019-09-17 辉县市新科机械设备有限公司 真空粉碎机
CN116550209B (zh) * 2023-05-24 2024-04-12 广东海诚高新科技有限公司 一种阳离子表面施胶剂及其制备装置、方法

Family Cites Families (6)

* 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
US3970257A (en) * 1972-10-05 1976-07-20 Macdonald George James Apparatus for reducing the size of discrete material
FR2283726A2 (fr) * 1974-09-06 1976-04-02 Air Liquide Fragmentation de solides
FR2412348A1 (fr) * 1977-12-20 1979-07-20 Creusot Loire Surface d'impact pour un broyeur a projection sous vide
NZ201190A (en) * 1982-08-07 1986-07-11 Barmac Ass Ltd Additional wear tip for rotary mineral breaker
FR2577445B1 (fr) * 1985-02-15 1988-05-27 Framatome Sa Dispositif de projection de particules solides pour broyeur centrifuge sous vide

Also Published As

Publication number Publication date
DE3773224D1 (de) 1991-10-31
CN87101899A (zh) 1987-09-02
EP0233812A3 (en) 1989-01-04
US4738403A (en) 1988-04-19
FR2594048A1 (fr) 1987-08-14
ZA87911B (en) 1987-09-30
FR2594048B1 (fr) 1988-05-27
AU594116B2 (en) 1990-03-01
AU6827187A (en) 1987-08-13
CA1264555A (en) 1990-01-23
EP0233812A2 (de) 1987-08-26
CN1009439B (zh) 1990-09-05
ATE67691T1 (de) 1991-10-15

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