EP0691159B1 - Séparateur pour broyeurs - Google Patents

Séparateur pour broyeurs Download PDF

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Publication number
EP0691159B1
EP0691159B1 EP95110410A EP95110410A EP0691159B1 EP 0691159 B1 EP0691159 B1 EP 0691159B1 EP 95110410 A EP95110410 A EP 95110410A EP 95110410 A EP95110410 A EP 95110410A EP 0691159 B1 EP0691159 B1 EP 0691159B1
Authority
EP
European Patent Office
Prior art keywords
classifier
mill
guide blade
guide
static
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
EP95110410A
Other languages
German (de)
English (en)
Other versions
EP0691159A1 (fr
Inventor
Horst Dipl.-Ing. Brundiek
Michael Dipl.-Ing. Keyssner
Reinhard Dipl.-Ing. Koschorek
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.)
Loesche GmbH
Original Assignee
Loesche GmbH
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 Loesche GmbH filed Critical Loesche GmbH
Publication of EP0691159A1 publication Critical patent/EP0691159A1/fr
Application granted granted Critical
Publication of EP0691159B1 publication Critical patent/EP0691159B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
    • B02C23/24—Passing gas through crushing or disintegrating zone
    • B02C23/32—Passing gas through crushing or disintegrating zone with return of oversize material to crushing or disintegrating zone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
    • B02C23/16—Separating or sorting of material, associated with crushing or disintegrating with separator defining termination of crushing or disintegrating zone, e.g. screen denying egress of oversize material
    • 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
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C2015/002—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs combined with a classifier

Definitions

  • the invention relates to a mill classifier, in particular a roller mill classifier, according to the preamble of claim 1.
  • Roller mill classifier which in a roller mill or in a roller mill, for example in an airflow mill, be integrated or placed on top of it can be designed as static or dynamic classifiers be.
  • a high-effect classifier for a roller mill is under the name Venetian blind gyroscope known.
  • a gyroscope or also a slat rotor sifter is arranged, that of concentric, nested cones different diameters to form a Is surrounded.
  • a first visual effect is through a coaxial swirl flow of the from the blade ring on Extent of the grinding plate exiting fluid flow reached, which causes a first coarse material separation in an edge zone.
  • An advantageous second visual effect is the Venetian blind cones achieved by the upward flowing Fluid-regrind mixture flow diversions with upward and Downward flow and then a radial flow is suspended, whereby a second portion of coarse material is excreted becomes.
  • This classifier has a cylindrical ledge rotor and a concentrically arranged vane ring on.
  • the most effective possible tangential flow between the static guide and the inguinal rotor are generated so that the coarse particles do not adhere can get the rotor.
  • Disadvantages are an increased Pressure loss and increasing wear of the guide vanes, especially at high particle concentrations.
  • Venetian blind centrifugal classifiers show in operation a relatively low wear and also a lower one Pressure loss.
  • the disadvantage is that the rigid design of the blind an optimization of the process parameters by the static Contradictory and that an adjustment and optimization only in the area of dynamic sighting, for example with the help of the rotor speed is.
  • the object of the invention is to create a highly effective mill classifier, in particular a roller mill classifier, which, with a particularly simple construction, enables extraordinarily high flexibility and optimization of the classifying processes.
  • the invention is based on the consideration of a mill classifier to create, in which the advantages of a high-effect blind sifter are maintained and its efficiency significantly improved by surprisingly simple measures is.
  • a strip rotor is a dynamic classifier arranged and as a static guide are several ring-shaped fins, at least a lower and an upper guide ring, concentric to the dynamic classifier and with the formation of a annular visual space provided.
  • a deflection device is provided which provides a gentle, directional deflection of the fluid regrind flow and a Downward flow or movement into the visual space.
  • the deflection takes place at an angle of greater than 120 ° up to almost 180 °, with a defined training the deflection device with the arrangement of the several guide vane rings an acceleration of the particle flow and a Speed increase in tangential flow reached becomes.
  • This is advantageous because it increases the Can lower the separating grain limit of the classifier.
  • the fins which in particular have the same dimensions and axially are arranged one above the other in such a way that the Flow cross section of a guide vane ring partially or is closed over the entire scope.
  • can through a tangential adjustment of the vertical guide vanes blocking of the flow cross-section achieved become.
  • the lower guide wing rim is completely closed, the radial speed increased accordingly in the upper guide vane ring , which changes the visual effects and separation limits can be achieved.
  • a significant increase in the visual effect and one additional increase in effectiveness is through a redirection possible by almost 180 ° by using a Downflow effect in the downward flow with gravity is achieved. With such a deflection to almost The particle downflow becomes 180 ° in addition to the kinetic Energy still the gravitational acceleration "g" as another increased speed component.
  • the static caution performed in the invention in the static diffuser is not only caused by Channel effect of the guide wing ring and not only through increasing the speed component of the particles by deflecting more than 120 ° but it will additionally an increase in the speed of the particles due to the gravitational acceleration acting on the downward flow reached.
  • a static diffuser constructed according to the invention brings about the emergence of a "vertebral depression" in the annular Space between the vane ring as a static viewing device and the ledge rotor as a dynamic visual apparatus.
  • vertebral depression also known as the cyclone flow coarse particles are beyond the known level flung out and thus kept away from the inguinal rotor.
  • the ingot rotor therefore has a particle mixture as a second stage of vision fed that from a very high proportion Coarse grain is already exempt.
  • the visual quality of the inguinal rotor improves considerably due to the lower percentage Rough offer.
  • the fluid regrind is in several vane rings and in the viewing space already from a high proportion of coarse goods free, even before the actual dynamic viewing process is carried out on the ingot rotor or centrifugal classifier.
  • This rotating rod basket increases the tangential speed of the fluid-particle mixture, the generated Centrifugal forces are largely determined by the rotor speed.
  • the adjustment option is the Guide wing rings not only on the tangential alignment for partial or complete blocking of the flow cross-section of a vane ring, but also includes a horizontal or radial adjustment the fins to change the distance between this static vision system or guide and the dynamic Classifier. This allows the grain distribution to influence the finished goods in a targeted manner.
  • an edge area of the classifying ceiling as Form deflection device and with a rotating To provide curvature with defined angles of inclination. It makes sense the curvature is concave in cross section, semicircular or also designed as an isosceles trapezoid. An outside inflow angle is the inclination angle and an internal deflection angle is provided, the with a preferred central arrangement of the fastening axes the fins are the same. On this will gently redirect the regrind fluid flow achieved at which there is no abrupt braking comes and an accumulation of particles largely is avoided.
  • An essential visual effect is created in the visual space by a Downdraft effect achieved in the downflow at gravity can work.
  • the formation of the deflection device or the Curvature in the sifter ceiling above the sifter rotor preferably has a height of approximately half the height of a guide vane ring, with the Guide wreaths also essentially above the Classifier rotor are arranged.
  • the upper vane ring with a hollow axis and the vane rings arranged below with hollow or Solid axes, which are guided in the respective upper hollow axis are on the sifter ceiling, preferably in the center of the Curve of the deflection device are attached.
  • the roller mill classifier 1 is open in the example according to FIG. 1 a roller mill is placed, of which next to two grinding rollers 17, a rotating grinding bowl 20 and a die Grinding bowl 20 surrounding blade ring 21 a mill housing 19 are shown as a section.
  • the roller mill classifier 1 has a conical design Classifier housing 2 and a classifier cover 3, in the area thereof the fine material discharge opening 24 is arranged. That too
  • the feed material is grinded over an axially arranged downpipe 22 fed to the grinding bowl 20.
  • a cone-shaped Semolina discharge opening 18 extends into the area of Grinding rollers 17 and merges into an intermediate wall 16, the up to guide vane rings 7, 8 of a static guide device 6 is enough.
  • an annular visual space 5 is formed in the the fluid regrind stream 4 (only shown in the left area) after a gentle deflection in the area of a deflection device 9 arrives.
  • the fluid regrind stream 4 Before the dynamic sighting with Help of the ledge rotor 10 or a gyro classifier the fluid regrind stream 4 in a downward flow of the Exposed to gravity.
  • the fluid regrind flow to be viewed 4 is in one of the from the blade ring 21st rising swirl flow in the area of the inner wall the mill housing 19 or the sifter housing 2 rises, in one of the partition 16 and the classifier housing 2 formed, tapering upwards Gap 26 to the deflection device 9 in the area the sifter ceiling 3 out.
  • This deflection device 9 is shown in the here Embodiment as a curvature 12 in an edge region of the Classification ceiling 3 and a static diffuser 6 are formed.
  • the curvature represents an isosceles cross section Trapezoid, the base of which faces down to the visual space 5 and space 26 is open.
  • the static diffuser 6 which from a lower guide vane ring 7 and one axially above it arranged, upper guide vane ring 8, attached, so that a functional interaction of the fins 7, 8 and the deflection device 9 is guaranteed.
  • the Curvature 12 of the deflection device 9 is located above of the classifying rotor 10 and has defined inclination angles on to build up particles of the fluid regrind flow 4 largely excluded.
  • these angles of inclination that have an outer edge Flow angle and an inner deflection angle, identically trained. With a dished bottom-like Execution is the flow angle and the deflection angle based on a horizontal in each case about 45 °.
  • the guide vanes of the upper one are in a central arrangement Guide vane ring 8 each via hollow axes 13 and below in a largely identical formation, the guide wings of the lower guide vane ring 7 via solid axes 14, which are guided in the upper hollow axis 13, attached.
  • the guide wing or guide wing rings 7, 8 are provided, around a fluid regrind flow 4, which in the area the deflection device 9 into the viewing space 5 by at least one 120 ° and a maximum of almost 180 ° deflection, after a downward flow of a radial flow of the To suspend classifier rotor 10.
  • the individual ones are advantageous angular settings of the two superimposed Guide wreaths 7, 8, which have a variety of Allow setting variants.
  • Pre-separation of coarse grain fractions is advantageous by sighting the swirl flow in the area of two guide vane rings 7, 8 of the static guide device 6 and by the force of gravity in the downward flow, whereby the visual goods offer in the dynamic ledge rotor 10 is reduced.
  • Another advantage is that special low wear, due to a relatively low flow rate of the particularly effective sifter is due.
  • FIG. 2 shows a Unit of the static guide 6.
  • This guide 6 has an upper guide vane 8 and one in the example lower guide wing 7.
  • the adjustability of these guide vanes 7, 8 is from outside, i.e. above the sifter ceiling 3 performed. For this is in the ceiling 3 Axle bearing 11 available.
  • the upper guide wing 8 is here arranged on a rotatable hollow shaft 13 which outside the sifter ceiling 3 with an adjustment device 33, which is designed in particular as a handle and can be fixed is attached.
  • the lower guide vane 7 which is rotationally rigid with the axis 14 is about this axis 14, which is through the hollow axis 13 protrudes outwards and the adjusting device 34, in particular a handle to the desired angle setting adjustable.
  • the guide vanes 7, 8 are therefore arranged one above the other and not offset against each other in the circumferential direction, so that also no separating ring between the two guide vanes required is. Even with different angular positions Guide vanes of the guide wing rings 7, 8 therefore only have minimal unwanted "false currents".

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Disintegrating Or Milling (AREA)
  • Seasonings (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
  • Eye Examination Apparatus (AREA)

Claims (10)

  1. Séparateur pour broyeurs, notamment séparateur pour broyeurs à cylindres, comportant un séparateur statique et un séparateur dynamique, ainsi qu'une chambre de séparation annulaire aménagée entre les deux séparateurs, un dispositif directeur (6) situé radialement à l'extérieur avec des aubages directeurs étant prévu comme séparateur statique et un rotor à palettes (10) étant prévu comme séparateur dynamique, caractérisé par le fait que le dispositif directeur statique (6) comporte au moins un aubage directeur (7) inférieur et un aubage directeur (8) supérieur avec des axes d'aubages (14, 13) mutuellement coaxiaux et par le fait que qu'il est prévu au-dessus du rotor à palettes (10), dans une région contiguë à l'aubage directeur (8) supérieur un dispositif de déviation (9) par lequel un écoulement ascendant (4) de produit de broyage fluide est transformé un écoulement descendant par gravité par une déviation ciblée dans une plage allant de plus de 120° à moins de 180°.
  2. Séparateur pour broyeurs selon la revendication 1, caractérisé par le fait que le dispositif de déviation (9) est disposé dans un toit de séparateur (3) et par le fait que les aubages directeurs (7,8) sont montés dans des paliers (11) dans la région du dispositif de déviation (9) et peuvent être réglés depuis l'extérieur.
  3. Séparateur pour broyeurs selon la revendication 1 ou 2, caractérisé par le fait que le dispositif de déviation (9) est agencé dans une région périphérique du toit du séparateur (3) sous forme d'arrondi (12) avec une inclinaison définie, notamment avec un angle d'entrée et un angle de déviation déterminés, et par le fait que les aubages directeurs (7,8) sont disposés au centre de l'arrondi (12) du toit de séparateur (3).
  4. Séparateur pour broyeurs selon la revendication 3, caractérisé par le fait que l'arrondi (12) en section transversale présente une forme concave, de demi-cercle, ou de trapèze isocèle avec une ouverture dirigé vers le bas.
  5. Séparateur pour broyeurs selon une des revendications précédentes, caractérisé par le fait que la hauteur de l'arrondi (12) correspond sensiblement à la moitié de la hauteur de l'aubage directeur supérieur (8).
  6. Séparateur pour broyeurs selon une des revendications précédentes, caractérisé par le fait que les aubages directeurs (7,8) peuvent être réglés indépendamment l'un de l'autre et par le fait que le réglage radial ou tangentiel peut être opéré individuellement ou simultanément pour toutes les aubes directrices (7,8) d'un aubage directeur (7,8).
  7. Séparateur pour broyeurs selon la revendication 6, caractérisé par le fait qu'il est prévu pour le réglage des aubages directeurs (7,8), des dispositifs de réglage (33,34) qui sont liés à un axe creux (13) des aubes directrices (8) de l'aubage directeur supérieur (8) et à un axe plein (14) des aubes directrices (7) de l'aubage directeur inférieur (7), l'axe plein (14) étant guidé dans l'axe creux (13).
  8. Séparateur pour broyeurs selon une des revendications précédentes, caractérisé par le fait qu'une paroi intermédiaire (16) qui se rétrécit en forme de cône en direction de la chambre de broyage (15) est disposée en-dessous des aubages directeurs (7,8), laquelle paroi intermédiaire, dans la région du rotor à palettes (10), délimite la chambre de séparation (5) et se termine dans une ouverture d'évacuation des produits grossiers (18), dans la région de cylindres de broyage (17) d'un broyeur à cylindres.
  9. Séparateur pour broyeurs selon la revendication 8, cractérisé par le fait que la paroi intermédiaire (16) et le corps de séparateur (2) et le corps de broyeur (19) définissent une chambre annulaire (26) qui se rétrécit dans la direction de l'écoulement ascendant de produit de broyage fluide (4).
  10. Séparateur pour broyeurs selon une des revendications précédentes, caractérisé par le fait qu'un tube de sortie par gravité (22) central est disposé pour évacuer le produit de broyage, lequel tube s'étend jusque dans le voisinage de l'ouverture d'évacuation des produits grossiers (18).
EP95110410A 1994-07-06 1995-07-04 Séparateur pour broyeurs Expired - Lifetime EP0691159B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4423815A DE4423815C2 (de) 1994-07-06 1994-07-06 Mühlensichter
DE4423815 1994-07-06

Publications (2)

Publication Number Publication Date
EP0691159A1 EP0691159A1 (fr) 1996-01-10
EP0691159B1 true EP0691159B1 (fr) 1999-02-03

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP95110410A Expired - Lifetime EP0691159B1 (fr) 1994-07-06 1995-07-04 Séparateur pour broyeurs

Country Status (13)

Country Link
US (1) US5622321A (fr)
EP (1) EP0691159B1 (fr)
JP (1) JPH0852433A (fr)
KR (1) KR960003823A (fr)
CN (1) CN1051943C (fr)
AT (1) ATE176406T1 (fr)
BR (1) BR9503098A (fr)
CA (1) CA2153221A1 (fr)
DE (2) DE4423815C2 (fr)
DK (1) DK0691159T3 (fr)
RU (1) RU2145522C1 (fr)
TW (1) TW316239B (fr)
ZA (1) ZA955386B (fr)

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US3078651A (en) * 1958-12-12 1963-02-26 Babcock & Wilcox Ltd Apparatus for classifying airdust mixture
US4504018A (en) * 1982-12-13 1985-03-12 Foster Wheeler Energy Corporation Particle classifier apparatus and method with rudder control vane
CA1239624A (fr) * 1984-11-06 1988-07-26 Fred R. Brands Pulverisateur
DE3515026C1 (de) * 1985-04-25 1986-09-18 Fa. Christian Pfeiffer, 4720 Beckum Drehluft-Schleuderkorb-Sichter
GB2176134A (en) * 1985-06-03 1986-12-17 Smidth & Co As F L Separator for sorting particulate material
IT1186412B (it) * 1985-12-06 1987-11-26 Snam Progetti Procedimento di varo dalla terraferma di condotte subacquee di grande dimensione,particolarmente per opere di presa
DE3808023A1 (de) * 1988-03-10 1989-09-21 Krupp Polysius Ag Sichter
US5252110A (en) * 1990-08-01 1993-10-12 Roland Nied Preferably vertical air separator
JP2617623B2 (ja) * 1991-01-21 1997-06-04 三菱重工業株式会社 ローラミル

Also Published As

Publication number Publication date
EP0691159A1 (fr) 1996-01-10
US5622321A (en) 1997-04-22
DE4423815C2 (de) 1996-09-26
CA2153221A1 (fr) 1996-01-07
RU2145522C1 (ru) 2000-02-20
DK0691159T3 (da) 1999-09-20
DE59505020D1 (de) 1999-03-18
RU95111439A (ru) 1997-06-27
ATE176406T1 (de) 1999-02-15
CN1122263A (zh) 1996-05-15
BR9503098A (pt) 1996-07-09
CN1051943C (zh) 2000-05-03
ZA955386B (en) 1996-02-09
KR960003823A (ko) 1996-02-23
TW316239B (fr) 1997-09-21
JPH0852433A (ja) 1996-02-27
DE4423815A1 (de) 1996-01-18

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