EP0199003B1 - Trieur à air rotatif avec cage centrifuge - Google Patents

Trieur à air rotatif avec cage centrifuge Download PDF

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Publication number
EP0199003B1
EP0199003B1 EP86101622A EP86101622A EP0199003B1 EP 0199003 B1 EP0199003 B1 EP 0199003B1 EP 86101622 A EP86101622 A EP 86101622A EP 86101622 A EP86101622 A EP 86101622A EP 0199003 B1 EP0199003 B1 EP 0199003B1
Authority
EP
European Patent Office
Prior art keywords
classifying
classifier
air
classifier according
centrifuge basket
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
EP86101622A
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German (de)
English (en)
Other versions
EP0199003A2 (fr
EP0199003A3 (en
Inventor
Ernst W. Dr.-Ing. Hanke
Benno Bonk
Erwin Schmitz
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.)
Christian Pfeiffer Maschinenfabrik & Co Komm GmbH
Original Assignee
Christian Pfeiffer Maschinenfabrik GmbH and Co KG
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 Christian Pfeiffer Maschinenfabrik GmbH and Co KG filed Critical Christian Pfeiffer Maschinenfabrik GmbH and Co KG
Priority to AT86101622T priority Critical patent/ATE45688T1/de
Publication of EP0199003A2 publication Critical patent/EP0199003A2/fr
Publication of EP0199003A3 publication Critical patent/EP0199003A3/de
Application granted granted Critical
Publication of EP0199003B1 publication Critical patent/EP0199003B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B7/00—Selective separation of solid materials carried by, or dispersed in, gas currents
    • B07B7/08—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force
    • B07B7/083—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force generated by rotating vanes, discs, drums, or brushes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B4/00—Separating solids from solids by subjecting their mixture to gas currents
    • B07B4/02—Separating solids from solids by subjecting their mixture to gas currents while the mixtures fall
    • B07B4/025—Separating solids from solids by subjecting their mixture to gas currents while the mixtures fall the material being slingered or fled out horizontally before falling, e.g. by dispersing elements

Definitions

  • the invention relates to a rotary air centrifuge classifier according to the preamble of claim 1.
  • Such a classifier is known from EP 67 894 A1.
  • Such classifiers need to separate the fine particles from the air in general dust separator, for. B. in the form of cyclones.
  • the individual particles of the material to be sighted are radially accelerated immediately from each of the corresponding impact points, with only a triangular diffusion curtain that can be interrupted by neighboring diffusion curtains being formed in the event of a slight drag.
  • this known classifier there is also the disadvantage that the shape and spacing of the scatter curtains change with changing speeds of the centrifugal basket with regard to changed separating grain boundaries, so that a uniform distribution of the material to be viewed cannot be achieved.
  • a PSZ spiral wind sifter is known (cement-lime gypsum, year 38, No. 1/85. "New findings on sifter design", by F. Sgaslik, Fig. 7), in which a predispersion of the visible material is sought.
  • the material to be sighted is fed in centrally in this PSZ classifier and is scattered from an inclined, rotating spreader plate into a non-rotating, conical distributor gap that widens downwards.
  • the uniformity of the visible material distribution improves with increasing diameter.
  • the angle of inclination of this distributor gap which surrounds the visible space, depends on the coefficients of friction of the trickling material.
  • the invention has for its object to improve a rotary air centrifuge classifier with a view to a more optimal classifying, the essential disadvantages mentioned above should be avoided and good predispersion even with increased throughput rates of the classifiable material is achieved, and this should also be possible, if appropriate, even with a suction line that is led off centrally for the fine exhaust air loaded with fine material.
  • An essential idea of the invention for improving the sighting and the throughput capacity with a more favorable height of the classifier is to perform an essentially central task of the material to be sighted on a first spreading plate, at least one further spreading plate being arranged downstream of this.
  • dispersing vanes are provided especially in the area before the visible material enters the visible space, which further improve the uniformity of the spreading of the material to be sifted into the subsequent visible space.
  • the areas of the individual funnel jackets are enlarged in the direction of the visible space in comparison to the previous stage in order to achieve a thinning and uniformization of the diffusing curtain.
  • the extraction line is preferably branched below the first spreading plate into several and especially two flow-symmetrical arranged exhaust air outlets.
  • the multiple levels of spreading plates and funnel jackets compensate for any discontinuities that may occur.
  • a higher suction capacity and also the connection of several cyclones is made possible by the multiple visual exhaust outlets.
  • the concept according to the invention therefore permits an overall space-saving design of the classifier with regard to its overall height and its diameter, even with a high feed performance and high suction performance, this being achieved with largely optimal dispersion of the grain mixture to be viewed.
  • the spreading plates, the dispersing vanes and the centrifugal basket are preferably designed to be separately drivable. As a result, both the same and a different rotation of these devices can be achieved.
  • the direction of rotation of these devices is such that the visible material flows into the visible air spirals circulating in the visible space in the same direction.
  • an upward discharge line is not an obstacle in the invention to provide a further, especially circular, spreading disc in this area.
  • the second spreading plate is combined with a tubular upwardly projecting peripheral wall coaxially surrounding the fixed suction line, this peripheral wall projecting axially upward into the mouth funnel of the first funnel jacket.
  • the suction line from the centrifugal basket downwards where the external units allow it.
  • the first stage of the funnel jacket can be designed to be significantly reduced axially without the dispersion of the visible material to be distributed being impaired.
  • the various suction effects in the centrifugal basket which are present in some cases in the prior art can largely be eliminated by providing guide vanes which are subdivided in the axial direction and are also angle-adjustable relative to one another. This makes it possible to give the spiral-shaped inflowing viewing air a different inflow path and swirl on the suction side than in the area of an opposite plate of the centrifugal basket, which is generally largely closed.
  • a further visual air inlet with appropriate guide vanes can expediently be provided in the area of the outlet for the coarse material adjacent to the lower area of the centrifugal basket.
  • this second visual air inlet can be designed in the manner of a bypass or a branch from the main visual air inlet.
  • a coaxial suction line can advantageously be provided on both sides of the centrifugal basket.
  • This has the advantage that the additional, fixed or non-rotatable sieve shells normally required inside the rotating centrifugal basket can be dispensed with.
  • the flow vanes of the centrifugal basket which are designed as strips or blades, can be stiffened radially to save weight and material. This enables a reduced moment of inertia due to the reduced mass, and the replaceable wear protection is also easier to handle.
  • the vertically operated classifier 20 has a central shaft 8 for driving an upper, first spreading plate 2 and a second spreading plate 5 arranged below it, with dispersing vanes 10 and a centrifugal basket 6 associated therewith.
  • the material to be sighted passes almost centrally into the sifter 20 through the inlet nozzle 1.
  • a single inlet nozzle 1 is provided which, in an inclined position, feeds the material to be sighted against the funnel opening of the spreading disc 2 into its inner cone.
  • the introduced visible material is thrown against a funnel casing 3 surrounding the spreading plate 2 at a radial distance.
  • this funnel jacket 3 consists of two conically tapered jacket regions which are connected to an essentially vertical circumferential wall, through which on each side of the classifier 20 a view exhaust pipe 4 is guided to the outside.
  • This vertical casing area of the first funnel casing 3 helps to achieve a largely uniform distribution of the introduced material to be seen despite the implementation of the sight air outlet 4. If higher suction powers are considered desirable for the sighting process, instead of the two shown in the example, approximately diametrically opposite, outward-looking exhaust air nozzles also leading to the outside, several, e.g. B. three or four such nozzles are provided with the same angular distance from each other.
  • the granular visible material slides downward in a spiral drag into a tapering opening which forms a mouth surface 35.
  • the grain mixture to be sifted slides into the second rotating spreader plate 5, which is essentially circular in shape, with a collar-like, tubular circumferential wall 34 at its radially inner end upwards over the mouth surface 35 of the first funnel casing 3 protrudes.
  • This circumferential wall 34 surrounds a central open-air exhaust pipe 7 which is open at the bottom and which is branched upward in the region of the vertical peripheral wall of the funnel jacket 3 into the two view-air connecting pieces 4.
  • a partial funnel opening upward forming spreading plate 5 are followed by approximately radially standing dispersing vanes 10, the z. B. are rotationally rigidly connected to the second spreading plate 5 and the centrifugal basket 6 arranged underneath.
  • the second spreading plate 5 is surrounded radially on the outside by a second funnel casing 9, which has a larger diameter than the first funnel casing 3.
  • the second spreading plate 5 throws the material to be sifted against the second funnel casing 9, on the circumference of which there is a complete circular distribution of the visible material .
  • the dispersing vanes 10 are provided for generating air vortices in order to allow the already largely uniformly distributed visible material to flow optimally predispersed into the viewing space 11 provided below.
  • torsionally rigid link between the spreading discs 2 and 5 and the Dispersing vanes 10 and the centrifugal basket 6 can also have separate rotary drives, e.g. B. via hollow shafts, can be provided for these individual assemblies.
  • the largely cylindrical centrifuge basket 6 has a relatively thin, closed plate 6 ′′ at the bottom. Radially outside, the centrifugal basket 6 has a ring of flow vanes 6 ′ which are arranged essentially axially parallel and which are designed, for example, as strips, blades or the like At its upper end, the centrifugal basket 6 is kept open over most of its diameter, for example over 2/3 of its diameter and more, in order to form a large suction opening in the direction of the central suction line 7. For reasons of stability, therefore this open part of the centrifugal basket 6 is equipped with a small number of radial spokes 6 "'which are fixed to the shaft 8 and below the dispersing vanes z. B. are welded. These spokes 6 '"can have a streamlined shape in cross-section, taking into account their direction of rotation, so that the suction flow acting in the centrifugal basket 6 remains largely unaffected.
  • the guide vanes are divided axially and divided into two individual, separately adjustable guide vane rings 12 and 13. For reasons of simplification, only two subdivisions are shown in the example.
  • These independently adjustable guide vane rings 12 and 13 can be used to set the type of air movement circulating in the viewing space 11, with the suction acting on the fine material depending on the axial height in the viewing space and at least partially reaching into the centrifugal basket, particularly in the case of a suction line provided on one side can be.
  • the sight air blown in through the sight air inlets 14 flows through the spiral housing 15 approximately on a narrowing spiral path.
  • the blown-in air is introduced into the viewing space 11 via the inclined vane guide rings 12 and 13 with a corresponding flow and swirl direction.
  • the visible material introduced through the entry gap 33 at the lower opening of the second funnel jacket 9 and dispersed into the viewing space 11 is viewed here in accordance with the grain size limit set.
  • This grain size limit depends on a variety of parameters, such as. B. speed of the centrifugal basket 6, throughput, degree of predispersion, adjustment of the guide vane limit, blowing and extraction speed of the sifting air, etc.
  • the sifting air laden with fine material flows through the flow vanes 6 ′ of the centrifugal basket 6 on its further path radially inward and is subsequently sucked off through the tubular suction line 7 onto the two sifting air sockets 4.
  • the following separators and cyclones for separating the fine material from the exhaust air are not shown.
  • the coarse material hopper 16 via which the material lying above the grain size limit is discharged.
  • a further spiral housing 17 with a likewise adjustable guide vane ring 18 adjoins after a short funnel-shaped transition region. In this area, there is therefore an inspection of the material falling down.
  • the secondary sight air inlet 14 'in the spiral housing 17 is therefore expediently connected to the primary sight air inlet 14, so that a controllable proportion of sight air can be blown in there for indulgence.
  • the flow vanes 6 'of the centrifugal basket 6 can have different profiles depending on the intended use and also differ in their radial extent. It is important to coordinate these assemblies, according to which the suction effect is largely evenly adjusted over the axial height of the centrifugal basket, even with one-sided suction line.
  • a radially expanded sight air duct in the area of the sight air inlet creates a constriction in the area of 180 ° after the entry of the sight air through the spiral housing 15.
  • the transition areas from the exhaust air line 7 to the visual exhaust air connection 4 are also designed.
  • the fluidic extraction of the visual air loaded with fine material takes place in a displacement of the visual air nozzle of 90 to 180 ° with respect to the confluence of the visual air inlets 14.
  • the centrifuge basket 56 of the classifier 30 is constructed axially reversed, so that the closed plate 6 "lies at the top, while the spokes 6" 'are arranged below to stiffen the centrifugal basket 56.
  • the serious advantage of the sifter 30 is that a central task of the material to be sifted is provided, the axial extent of the entire sifter being able to be significantly reduced by the omission of an upper exhaust air duct and corresponding connections, in particular the first distribution of the sifter 30 good to be sifted be carried out via a conical funnel jacket 3 with a single stage. For this reason, the spreading discs 2 and 5 can be attached to the shaft almost at certain points.
  • a downward, tubular exhaust air line 27 connects centrally to the centrifugal basket 6, which is open at the bottom. This is slightly tapered in the after-inspection area, in order to subsequently open it in the area of the coarse material hopper 16 in two outgoing air outlet pipes which are guided outwards at an angle to the axis of the sifter 30.
  • the extraction of the visual exhaust air downwards also has the advantage that any stringy designs of the visual material sliding curtain are excluded from the outset.
  • FIG. 4 An exemplary profile of the flow vanes 6 'can be seen in the left half of FIG. 4.
  • the flow vanes 6 ' are designed approximately as isosceles rectangular angles, the tips of which point radially outwards. A symmetrical arrangement to the radius is sought.
  • a change in the angle in the axial height is also expedient in order to ensure a suction which is as uniform as possible over the axial height of the centrifugal basket 56 when the exhaust air is sucked in from one side.
  • the closed plate 6 ′′ can be seen radially on the inside, to which the entry gap 33 or the annular-cylindrical visible space 11 adjoins it.

Landscapes

  • Combined Means For Separation Of Solids (AREA)
  • Cyclones (AREA)
  • Centrifugal Separators (AREA)

Claims (13)

1. Ensemble classificateur -panier de centrifugation- cyclone (20) comportant un panier de centrifugation (6) pouvant être entraîné sur un axe de rotation vertical qui comprend des ailettes d'écoulement (6') prévu radialement à l'extérieur et qui est amené essentiellement de l'extérieur vers l'intérieur par l'air de classification, un espace de classification (11) circulaire entourant le panier de centrifugation sur lequel se limite radialement vers l'extérieur une couronne co-axiale d'aubes directrices (12, 13), où l'air de classification peut être amené sur les aubes directrices (12, 13) en avant, sous forme de spirale avec un mouvement de rotation dans la chambre de classification, une entrée (1) à la partie supérieure de la chambre de classification (11) pour la matière à classer, une sortie (16) à la partie inférieure de la chambre de classification (11), pour les particules grossières, et au moins une canalisation (4, 27), pratiquement co-axiale, munie du côté de l'axe du panier de centrifugation pour l'air de sortie chargé de fines particules, caractérisé en ce qu'à l'entrée de la matière à classer est disposé un premier plateau répartiteur pouvant tourner sur un axe vertical qui amène la matière à classer à une première trémie (3) comportant au moins un étage et entourant ce plateau répartiteur avec un espace radial, en ce que succédant au moins à l'embouchure de la première surface en entonnoir (3), se trouve un autre second plateau répartiteur (5), pouvant tourner sur l'axe vertical, pour amener la matière à classer sur une seconde surface en entonnoir (9) de diamètre plus grand en comparaison de la première surface en entonnoir (3), et en ce que dans la zone de l'espace annulaire d'entrée (33) se raccordant à l'embouchure de la seconde surface en entonnoir (9), dans l'espace de classification annulaire (11), sont prévues pour la matière à classer des ailettes de dispersion (10) pouvant tourner sur l'axe vertical.
2. Classificateur selon la revendication 1, caractérisé en ce que la canalisation d'aspiration (7, 27) se transforme dans le carter du classificateur (40) en sorties multiples d'air d'échappement du classificateur (4, 24) disposées symétriquement par rapport à l'écoulement.
3. Classificateur selon la revendication 1 ou 2, caractérisé en ce que la canalisation d'aspiration (7), sortant du panier de centrifugeuse (6), est placée vers le haut, de telle sorte que les sorties multiples d'air d'échappement (4) sont dirigées vers la partie inférieure du premier plateau répartiteur (2) en particulier avec le même espace périphérique et/ou pratiquement perpendiculaires à l'axe de rotation, à partir du carter du dlassificateur (40).
' 4. Classificateur selon l'une des revendications 1 à 3, caractérisé en ce que le second plateau répartiteur (5) est de forme à peu près circulaire et comporte une paroi périphérique (34) entourant coaxialement la canalisation d'aspiration (7) dirigée vers le haut, qui pénètre particulièrement de façon axiale dans la première surface d'embouchure (35) de la première surface en entonnoir (3).
5. Classificateur selon l'une des revendications 1 à 4, caractérisé en ce que la canalisation d'aspiration (27) est placée en sortant vers le bas à partir du panier de centrifugation (56).
6. Classificateur selon l'une des revendications 1 à 5, caractérisé en ce que le panier de centrifugation (6, 56) comporte à l'opposé de la seule canalisation d'aspiration (7, 27), une plaque pratiquement fermée (6").
7. Classificateur selon l'une des revendications 1 à 6, caractérisé en ce qu'au moins le second plateau répartiteur (5) et/ou les ailettes de dispersion (10) sont liés solidairement en rotation avec le panier de centrifugeuse (6).
8. Classificateur selon l'une des revendications 1 à 7, caractérisé en ce que les plateaux répartiteurs (2, 5), les ailettes de dispersion (10) et le
panier de centrifugation (6, 56) peuvent être entraînés les uns par rapport aux autres à des vitesses égales ou différentes.
9. Classificateur selon l'une des revendications 1 à 8, caractérisé en ce que les aubes directrices (12, 13) sont réparties dans le sens axial et/ou sont réglables angulairement en particulier les unes par rapport aux autres.
10. Classificateur selon l'une des revendications 1 à 9, caractérisé en ce que, dans la zone de la sortie (16) pour la matière grossière, on prévoit une seconde admission d'air de classification (14') ramifiée, en particulier à partir de la première admission d'air de classification (14), pour l'opération de classification suivante.
11. Classificateur selon l'une des revendications 1 à 10, caractérisé en ce que les plateaux répartiteurs (2, 5) sont de forme pratiquement conique avec la face conique tournée vers le haut.
12. Classificateur selon l'une des revendications 1 à 11, caractérisé en ce qu'axialement des deux côtés du panier de centrifugation, on prévoit, chaque fois, une canalisation d'aspiration co-axiale pour l'air d'échappement chargée de matière fine.
EP86101622A 1985-04-25 1986-02-07 Trieur à air rotatif avec cage centrifuge Expired EP0199003B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86101622T ATE45688T1 (de) 1985-04-25 1986-02-07 Drehluft-schleuderkorb-sichter.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3515026A DE3515026C1 (de) 1985-04-25 1985-04-25 Drehluft-Schleuderkorb-Sichter
DE3515026 1985-04-25

Publications (3)

Publication Number Publication Date
EP0199003A2 EP0199003A2 (fr) 1986-10-29
EP0199003A3 EP0199003A3 (en) 1988-01-20
EP0199003B1 true EP0199003B1 (fr) 1989-08-23

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ID=6269139

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86101622A Expired EP0199003B1 (fr) 1985-04-25 1986-02-07 Trieur à air rotatif avec cage centrifuge

Country Status (4)

Country Link
US (1) US4661244A (fr)
EP (1) EP0199003B1 (fr)
AT (1) ATE45688T1 (fr)
DE (2) DE3515026C1 (fr)

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GB2176134A (en) * 1985-06-03 1986-12-17 Smidth & Co As F L Separator for sorting particulate material
DE3545691C1 (de) * 1985-12-21 1987-01-29 Orenstein & Koppel Ag Vorrichtung zum Klassieren von staubfoermigen Schuettguetern
DE3621221A1 (de) * 1986-06-25 1988-01-14 Pfeiffer Fa Christian Verfahren zur windsichtung und windsichter
DE3622413C2 (de) * 1986-07-03 1995-08-03 Krupp Polysius Ag Sichter
DE3823380C2 (de) * 1988-07-09 1994-09-08 Kloeckner Humboldt Deutz Ag Sichter zum Sichten von körnigem, insbesondere agglomeriertem Gut
FR2658096B1 (fr) * 1990-02-13 1992-06-05 Fives Cail Babcock Selecteur a air a action centrifuge.
DE4014342C2 (de) * 1990-05-04 1994-06-23 Heinz Jaeger Windsichter
DE9015363U1 (de) * 1990-11-08 1991-01-17 Christian Pfeiffer Maschinenfabrik GmbH & Co KG, 4720 Beckum Vorrichtung zur Materialdispergierung
DE4423815C2 (de) * 1994-07-06 1996-09-26 Loesche Gmbh Mühlensichter
DE19511313C2 (de) * 1995-03-28 1997-07-17 Gkn Walterscheid Getriebe Gmbh Schalteinrichtung für ein Zahnradgetriebe
US6276534B1 (en) 1998-04-03 2001-08-21 Hosokawa Micron Powder Systems Classifier apparatus for particulate matter/powder classifier
DE10122644B4 (de) * 2001-05-10 2005-05-12 Loesche Gmbh Sichter
US6739456B2 (en) 2002-06-03 2004-05-25 University Of Florida Research Foundation, Inc. Apparatus and methods for separating particles
EP1561519A1 (fr) * 2004-02-04 2005-08-10 Magotteaux International S.A. Séparateur de matière granuleuse
DE102006044833B4 (de) * 2006-09-20 2010-01-21 Babcock Borsig Service Gmbh Zentrifugalsichter und Verfahren zum Sichten
DE102007013029A1 (de) * 2007-03-19 2008-09-25 Roland Dr. Nied Windsichter-Betriebsverfahren und Windsichter
JP4785802B2 (ja) * 2007-07-31 2011-10-05 株式会社日清製粉グループ本社 粉体分級装置
WO2014117031A1 (fr) 2013-01-24 2014-07-31 Lp Amina Llc Dispositif de classification
DE102016115714A1 (de) 2016-08-24 2018-03-01 Schäfer E. Technik u. Sondermaschinen GmbH Prallreaktor

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Also Published As

Publication number Publication date
DE3665138D1 (en) 1989-09-28
DE3515026C1 (de) 1986-09-18
EP0199003A2 (fr) 1986-10-29
US4661244A (en) 1987-04-28
ATE45688T1 (de) 1989-09-15
EP0199003A3 (en) 1988-01-20

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