EP0199003A2 - Trieur à air rotatif avec cage centrifuge - Google Patents

Trieur à air rotatif avec cage centrifuge Download PDF

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Publication number
EP0199003A2
EP0199003A2 EP86101622A EP86101622A EP0199003A2 EP 0199003 A2 EP0199003 A2 EP 0199003A2 EP 86101622 A EP86101622 A EP 86101622A EP 86101622 A EP86101622 A EP 86101622A EP 0199003 A2 EP0199003 A2 EP 0199003A2
Authority
EP
European Patent Office
Prior art keywords
classifier
centrifugal basket
air
suction line
vanes
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.)
Granted
Application number
EP86101622A
Other languages
German (de)
English (en)
Other versions
EP0199003B1 (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
PFEIFFER FA CHRISTIAN
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 PFEIFFER FA CHRISTIAN, Christian Pfeiffer Maschinenfabrik GmbH and Co KG filed Critical PFEIFFER FA CHRISTIAN
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 separators generally require dust separators, e.g. in the form of cyclones.
  • the individual particles of the material to be sighted are immediately radially accelerated from each of the corresponding points of contact, with only a triangular diffusion curtain, which is from neighboring ones, being formed in the event of a slight drag beard scatter veils can be interrupted, can form.
  • 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 S ichtgutver republic diameter increases.
  • the ER- f on formulas has shown, however, that the inclination angle of this distribution gap, which surrounds the sifting chamber, depending on the friction coefficients of the trickling view good.
  • 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 of the classifiable material to be viewed is achieved, and this should also be possible, if appropriate, with a suction line that is led off centrally for the fine exhaust air that is loaded with fine material.
  • An essential idea of the invention to improve the classification and the throughput assets at favorable overall height of the classifier is to make a substantially 'central task of the separated material to a first spreading plate, wherein this plate is a further scattering at least downstream.
  • this spreading disc 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 step in order to achieve a thinning and equalization of the Slreuse veil.
  • the suction line is preferably branched below the first spreading plate into several, and especially two, flow-symmetrically arranged sight 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 visual air on the suction side a different inflow path and swirl configuration than in the area of an opposite, generally largely closed plate of the centrifugal basket.
  • 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 centrifuge basket to improve the flow conditions within 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 he possible a reduced momentum due to the reduced mass, whereby 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 IO associated therewith and a centrifugal basket 6.
  • the visible material reaches the sifter 20 almost centrally through the inlet connection 1.
  • a single inlet connection 1 is provided which, in an inclined position, feeds the visible material into the inner cone against the funnel opening of the spreading plate 2.
  • 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 a substantially 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 extraction capacities are considered to be desirable for the viewing process, instead of the two shown in the example, approximately diametrically opposite, outgoing air connecting pieces leading to the outside, several, e.g. three or four such nozzles with the same angular distance from one another can also be provided.
  • the granular visible material slides downward in a spiral drag into a tapering opening which forms a mouth surface 35.
  • Strands of the sliding veil of the material to be sifted which can form in the case of very small quantities of the imported material to be sifted as a result of the penetration of the air outlet nozzle, are largely compensated for and the material to be sifted is largely uniform, somewhat collected.
  • 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.
  • the spreading plate 5 which forms a partial funnel opening upwards, is adjoined at the bottom by approximately radially standing dispersing vanes 10 which e.g. 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.
  • the largely cylindrical centrifugal 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 can be 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 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, this open part of the centrifugal basket is therefore 6 are equipped with a small number of radial spokes 6 '' 'which are firmly welded to the shaft 8 and below the dispersing vanes, for example. These spokes 6' '' can have a streamlined shape in cross-section, taking into account their direction of rotation, so that they enter the centrifugal basket 6 acting suction flow remains largely unaffected.
  • the guide vanes are axially divided and divided into two individual, separately adjustable guide vane rings 12 and 13.
  • 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 large number of parameters, such as the rotational speed of the centrifugal basket 6, throughput, degree of predispersion, setting of the guide vane limit, blowing speed and extraction speed of the sifting air, etc.
  • 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 a suction line on one side.
  • ß a narrowing is produced in a range of 180 0 to the entry of the separating air through the spiral housing 15 of a radially enlarged view of the air guide in the area of classifying air occurrence.
  • 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 at the bottom 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 omitted
  • the first distribution of the material to be sifted can be carried out via a conical funnel jacket 3 with a single step. 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 view exhaust down also brings the advantage that any stringy training of reformgut- G leitschleiers be 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 as uniform a suction as possible over the axial height of the centrifugal basket 56 in the case of one-sided visual exhaust air suction.
  • 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)
  • Centrifugal Separators (AREA)
  • Cyclones (AREA)
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 true EP0199003A2 (fr) 1986-10-29
EP0199003A3 EP0199003A3 (en) 1988-01-20
EP0199003B1 EP0199003B1 (fr) 1989-08-23

Family

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)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0204412A2 (fr) * 1985-06-03 1986-12-10 F.L. Smidth & Co. A/S Séparateur pour le tirage de particules de matière
EP0250921A2 (fr) * 1986-07-03 1988-01-07 Krupp Polysius Ag Séparateur pneumatique

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
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 (fr) * 1990-11-08 1991-01-17 Christian Pfeiffer Maschinenfabrik Gmbh & Co Kg, 4720 Beckum, De
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
US9211547B2 (en) 2013-01-24 2015-12-15 Lp Amina Llc Classifier
DE102016115714A1 (de) 2016-08-24 2018-03-01 Schäfer E. Technik u. Sondermaschinen GmbH Prallreaktor

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1507729A1 (de) * 1966-07-05 1970-01-08 Polysius Ag Windsichter
FR2011958A1 (fr) * 1968-06-19 1970-03-13 Polysius Gmbh
EP0023320A1 (fr) * 1979-07-17 1981-02-04 Onoda Cement Company, Ltd. Séparateur sélectif d'air
DE3038625A1 (de) * 1980-10-13 1982-05-19 Fa. Christian Pfeiffer, 4720 Beckum Drehluft-fliehkraft-streusichter
EP0067894A1 (fr) * 1981-06-19 1982-12-29 OMYA GmbH Séparateur centrifuge

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2988220A (en) * 1955-10-10 1961-06-13 Microcyclomat Co Turbo-classifier
US3015393A (en) * 1959-08-14 1962-01-02 Microcyclomat Co Centripetal classifier rotor deck selector
DE1607623A1 (de) * 1967-08-21 1970-10-22 Wedag Westfalia Dinnendahl Mahlanlage fuer feuchtes Gut
DE1911417C3 (de) * 1969-03-06 1985-05-09 Krupp Polysius Ag, 4720 Beckum Umluftsichter
US4152254A (en) * 1976-11-11 1979-05-01 Krauss-Maffei Aktiengesellschaft Disk centrifuge for granular material
DE2748336A1 (de) * 1977-10-28 1979-05-03 Heinz Jaeger Umluftsichter
US4390419A (en) * 1981-10-16 1983-06-28 Omya Gmbh Centrifugal classifier
DE3222878C1 (de) * 1982-06-18 1983-12-22 PKS-Engineering GmbH & Co KG, 4720 Beckum Verfahren zum Betreiben eines Windsichters und Windsichter zur Durchfuehrung des Verfahrens
DE3303078C1 (de) * 1983-01-29 1984-05-30 Alpine Ag, 8900 Augsburg Windsichter fuer den Feinstbereich
DE3411785A1 (de) * 1983-04-22 1984-10-25 Heinz 4630 Bochum Jäger Verfahren und vorrichtung zur mehrprodukten-sichtung, insbesondere von zement
US4551241A (en) * 1984-02-08 1985-11-05 Sturtevant, Inc. Particle classifier

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1507729A1 (de) * 1966-07-05 1970-01-08 Polysius Ag Windsichter
FR2011958A1 (fr) * 1968-06-19 1970-03-13 Polysius Gmbh
EP0023320A1 (fr) * 1979-07-17 1981-02-04 Onoda Cement Company, Ltd. Séparateur sélectif d'air
DE3038625A1 (de) * 1980-10-13 1982-05-19 Fa. Christian Pfeiffer, 4720 Beckum Drehluft-fliehkraft-streusichter
EP0067894A1 (fr) * 1981-06-19 1982-12-29 OMYA GmbH Séparateur centrifuge

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0204412A2 (fr) * 1985-06-03 1986-12-10 F.L. Smidth & Co. A/S Séparateur pour le tirage de particules de matière
EP0204412A3 (en) * 1985-06-03 1987-10-14 F.L. Smidth & Co. A/S Separator for sorting particulate material
EP0250921A2 (fr) * 1986-07-03 1988-01-07 Krupp Polysius Ag Séparateur pneumatique
EP0250921A3 (en) * 1986-07-03 1989-08-30 Krupp Polysius Ag Air classifier

Also Published As

Publication number Publication date
EP0199003B1 (fr) 1989-08-23
DE3665138D1 (en) 1989-09-28
EP0199003A3 (en) 1988-01-20
US4661244A (en) 1987-04-28
ATE45688T1 (de) 1989-09-15
DE3515026C1 (de) 1986-09-18

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