EP0374491A2 - Séparateur pneumatique - Google Patents

Séparateur pneumatique Download PDF

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Publication number
EP0374491A2
EP0374491A2 EP89121348A EP89121348A EP0374491A2 EP 0374491 A2 EP0374491 A2 EP 0374491A2 EP 89121348 A EP89121348 A EP 89121348A EP 89121348 A EP89121348 A EP 89121348A EP 0374491 A2 EP0374491 A2 EP 0374491A2
Authority
EP
European Patent Office
Prior art keywords
classifier
rotor
distributor
crop
mill
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
EP89121348A
Other languages
German (de)
English (en)
Other versions
EP0374491A3 (fr
EP0374491B1 (fr
Inventor
Michael Dr.-Ing. Von Seebach
Norbert Dipl.-Ing. Patzelt
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.)
ThyssenKrupp Industrial Solutions AG
Original Assignee
Krupp Polysius AG
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 Krupp Polysius AG filed Critical Krupp Polysius AG
Publication of EP0374491A2 publication Critical patent/EP0374491A2/fr
Publication of EP0374491A3 publication Critical patent/EP0374491A3/fr
Application granted granted Critical
Publication of EP0374491B1 publication Critical patent/EP0374491B1/fr
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
    • 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
    • B02C23/20—Adding fluid, other than for crushing or disintegrating by fluid energy after crushing or disintegrating
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C21/00—Disintegrating plant with or without drying of the material
    • B02C21/002—Disintegrating plant with or without drying of the material using a combination of a roller mill and a drum mill
    • B02C21/005—Disintegrating plant with or without drying of the material using a combination of a roller mill and a drum mill the roller mill having cooperating rollers
    • 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
    • B02C23/10—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone
    • 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
    • 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
    • B02C2013/1885—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 of dead bed type

Definitions

  • the invention relates to a classifier according to the preamble of claim 1.
  • a classifier according to the preamble of claim 1 is known for example from EP-A-0 221 246.
  • the material distributor designed as a plate is located directly on the top of the rotor and can be rotated together with the rotor.
  • the invention has for its object to design a classifier according to the preamble of claim 1 so that it can be used advantageously in grinding plants equipped with a material bed roller mill, in which the regrind discharged from the material bed roller mill often has a high proportion Contains fines.
  • the crop distributor is driven independently of the rotor by means of a separate drive device.
  • the speed of the crop distributor can be selected so that there is an optimal deagglomeration of the slugs.
  • the material distributor is designed in accordance with the invention in such a way that the dissolution of the material and the uniform spreading into the viewing space is promoted.
  • the classifier 1 illustrated in FIGS. 1-3 contains a driven rotor 2 with a vertical axis, which has blades 3 arranged on its circumference at a distance from one another.
  • the rotor 2 is surrounded by a fixed guide device 4, which contains adjustable guide vanes and via which a visible air flow supplied by means of an inlet spiral 5 enters the viewing space 6 between the guide device 4 and the rotor 2.
  • the rotor 2 is driven from below by a drive motor (not shown) via a shaft 8 which is mounted above the rotor 2 in a bearing 10 carried by radial webs 9.
  • a coarse material hopper 11 for discharging the coarse material dropping out of the viewing space 6 is located below the rotor 2 and the guide apparatus 4.
  • a channel 12 adjoins the open lower end face of the rotor 2, which is used to discharge the fine air stream loaded with fine material.
  • a crop distributor 13 is arranged at a distance above the rotor 2 and is driven independently of the rotor 2 by a separate drive motor 14 via a belt drive 15 and a hollow shaft 16.
  • the hollow shaft 16 is supported in bearings 17, 18.
  • the crop distributor 13 contains a plate-shaped base plate 19 and an annular cover plate 20. Between the base plate 19 and the cover plate 20 there are a number (for example three) guide webs 21 which are inclined in relation to the radial position in the direction of rotation (arrow 22) of the crop distributor. Holding elements 23, 24 are provided in the region of the ends of the guide webs 21. Support plates 25 support the guide webs 21 from the outside.
  • annular crop inlet opening 26 Between the annular cover plate 20 of the crop distributor 13 and the shaft 16 there is an annular crop inlet opening 26, through which the crop fed, for example by means of a conveyor belt 27 and a feed chute 28, is fed to the crop distributor 13.
  • the crop distributor 13 is surrounded at a radial distance by an annular chamber 29 which is open towards the crop distributor 13 and which represents a baffle and deagglomeration zone for the crop thrown outwards by the crop distributor 13. Since the annular chamber 29 has a bottom 30, a filling 31 is formed in this annular chamber 29, onto which the material thrown off by the material distributor 13 strikes and which thus acts as a ver wear protection works.
  • a good cushion is formed on the guide webs 21 of the material distributor 13 - significantly favored by the jamming effect exerted by the holding elements 23, 24 - onto which the material entering through the material inlet opening 26 into the material distributor 13 and flung outward in the radial direction Impact good particles.
  • the wear on the surfaces coming into contact with the good agglomerates is significantly reduced.
  • the material to be sifted (preferably the material to be discharged from a material bed roller mill) is fed to the material distributor 13, thrown by it into the annular chamber 29 and optimally dissolved and homogenized in this impact and deagglomeration zone.
  • the material distributor 13 thrown by it into the annular chamber 29 and optimally dissolved and homogenized in this impact and deagglomeration zone.
  • the largely dissolved and homogenized material falls into the viewing space 6 between the guide device 4 and the rotor 2.
  • the coarse material falls out of the viewing space 6 downwards and is discharged via the coarse material funnel 11
  • the speeds (and, if necessary, the direction of rotation) of rotor 2 and crop distributor 13 can be selected differently, so that both the deagglomeration and the sighting can be optimally adjusted to match the crop.
  • feed chutes 28 can be arranged.
  • screws can also be provided for feeding the ground material.
  • FIGS. 1-3 contains a feed hopper 33, a material bed roller mill 34, a circulation bucket elevator 35, a classifier 1 (corresponding to FIGS. 1-3) which is also designed as a deagglomerator, a separator 36 and a circulating air fan 37.
  • the coarse material discharged via the coarse material hopper 11 of the classifier 1 is returned in the grinding system according to FIG. 4 via a return 38 to the inlet shaft 39 of the material bed roller mill 34.
  • the fine material separated from the classifying air flow in the separator 36 forms the finished product (line 40).
  • the grinding system according to FIG. 4 thus shows the diagram of a purely circular grinding with a material bed roller mill 34. Since the scraps discharged from the roller mill 34 take place in the material distributor of the classifier 1, a separate disagglomeration device is unnecessary; at the same time, the funding path is shortened.
  • a fine mill preferably designed as a tube mill 41, is provided, which is the coarse material discharged via the coarse material hopper 11 of the classifier 1 is fed well.
  • the common discharge of the tube mill 41 and the separator 36 forms the finished product (line 42).
  • returns 43, 44 indicated by dashed lines are also provided, via which - alternatively or additionally - material discharged from the material bed roller mill 34 (return 43) and / or material discharged via the coarse material hopper 11 of the classifier 1 (return 44) can be returned to the inlet shaft 39 of the material bed roller mill 34.
  • FIG. 5 thus shows a grinding plant with pre-grinding in the material bed roller mill 34 and fine grinding in the continuous tube mill 41, alternatively with semolina and / or Scheller return to the material bed roller mill.
  • the disagglomeration of the slugs in classifier 1 significantly simplifies the system and significantly reduces operating costs.
  • the grinding system illustrated in FIG. 6 contains the same elements as the system according to FIG. 5. As with the grinding system according to FIG. 4, all of the coarse material discharged via the coarse material hopper 11 of the classifier 1 is returned to the material bed roller mill 34, while that in the separator 36 separated material is still subjected to regrinding in the tube mill 41.
  • a circulation bucket elevator 45 is provided, which returns the discharge of the tube mill 41 to the feed chute 28 of the classifier 1, so that it together with the discharge material Material bed roller mill 34 reaches the material distributor 13 of the classifier 1.
  • the finished product is withdrawn from separator 36 (line 46).
  • FIG. 8 finally shows a grinding plant which, in addition to the plant parts illustrated in FIG. 5, also contains a circulation bucket elevator 45, a further classifier 47 and a separator 48.
  • the sifter 47 is - in contrast to the sifter 1 - designed in the usual way, i. H. provided with a single drive motor through which the rotor and a suitably designed spreading disc are driven.
  • the ground material discharged from the tube mill 41 is fed to the sifter 47 via the circulation bucket elevator 45.
  • the coarse material separated in the sifter 47 is again fed (together with the discharge material from the separator 36) to the tube mill 41, while the fine material discharged from the sifter 47 forms the finished product after separation in the separator 48.
  • FIG. 9 shows a variant of the supply of goods to the distributor 13, which is particularly suitable for larger versions.
  • the supply of goods takes place here through the correspondingly large shaft 16, via which the crop distributor is driven by the drive motor 14.
  • the material thus reaches the material distributor 13 centrally and is thrown outwards by the latter in the manner already explained and is deagglomerated in the annular chamber 29.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Combined Means For Separation Of Solids (AREA)
EP89121348A 1988-12-22 1989-11-17 Séparateur pneumatique Expired - Lifetime EP0374491B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3843338 1988-12-22
DE3843338A DE3843338A1 (de) 1988-12-22 1988-12-22 Sichter

Publications (3)

Publication Number Publication Date
EP0374491A2 true EP0374491A2 (fr) 1990-06-27
EP0374491A3 EP0374491A3 (fr) 1991-12-11
EP0374491B1 EP0374491B1 (fr) 1994-02-16

Family

ID=6369914

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89121348A Expired - Lifetime EP0374491B1 (fr) 1988-12-22 1989-11-17 Séparateur pneumatique

Country Status (4)

Country Link
US (1) US5024754A (fr)
EP (1) EP0374491B1 (fr)
DE (2) DE3843338A1 (fr)
ES (1) ES2050207T3 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992009376A1 (fr) * 1990-11-26 1992-06-11 F.L. Smidth & Co. A/S Separateur double servant a trier des matieres particulaires
EP0519535A1 (fr) * 1991-06-17 1992-12-23 ITALCEMENTI S.p.A. Séparateur dynamique pour matières pulvérulentes, en particulier du ciment, et installation comportant ledit séparateur
EP0629448A3 (fr) * 1993-06-17 1995-02-08 Krupp Polysius Ag Installation et procédé de broyage et de tamisage de matériau friable.
EP0715892A1 (fr) * 1994-12-07 1996-06-12 Krupp Polysius Ag Procédé et installation pour le broyage commun d'au-moins deux substances ayant des caractéristiques de broyage différentes
WO1998014281A1 (fr) * 1996-09-30 1998-04-09 Colgate-Palmolive Company Turbo-separation de sous-produits animaux
FR2754475A1 (fr) * 1995-04-14 1998-04-17 Ishikawahima Harima Jukogyo Ka Classificateur de materiau poudreux
DE102007046834A1 (de) * 2007-09-29 2009-04-02 Holcim Technology Ltd. Verfahren zur Herstellung von hochwertigen Portlandzementen oder von Sonderzementen
WO2014056974A1 (fr) * 2012-10-10 2014-04-17 Thyssenkrupp Resource Technologies Gmbh Installation de broyage

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9015363U1 (de) * 1990-11-08 1991-01-17 Christian Pfeiffer Maschinenfabrik GmbH & Co KG, 4720 Beckum Vorrichtung zur Materialdispergierung
DE4306930B4 (de) * 1992-07-25 2005-11-10 Khd Humboldt Wedag Ag Anlage zur Zerkleinerung von Mahlgut
DE4224704C2 (de) * 1992-07-25 2002-01-31 Kloeckner Humboldt Wedag Verfahren und Anlage zur Zerkleinerung von Mahlgut
DE4303987A1 (de) * 1993-02-11 1994-08-18 Kloeckner Humboldt Deutz Ag Mahlverfahren und zugehörige Mahlanlage
CN1100625C (zh) * 1996-10-11 2003-02-05 石川岛播磨重工业株式会社 分级机
US6276534B1 (en) 1998-04-03 2001-08-21 Hosokawa Micron Powder Systems Classifier apparatus for particulate matter/powder classifier
US6202854B1 (en) * 1999-03-23 2001-03-20 Marsulex Environmental Technologies, Llc Air classifier for particulate material
DE10147591B4 (de) * 2001-09-27 2006-11-16 Polysius Ag Mahlanlage
US6739456B2 (en) 2002-06-03 2004-05-25 University Of Florida Research Foundation, Inc. Apparatus and methods for separating particles
DE102004027128A1 (de) * 2004-06-03 2005-12-22 Polysius Ag Vorrichtung zum Sichten von körnigem Gut in wenigstens drei Kornfraktionen
DE102013008907A1 (de) * 2013-05-25 2014-11-27 Khd Humboldt Wedag Gmbh Kreislaufmahlanlage
CN110369033B (zh) * 2019-07-16 2021-08-06 江西亚香香料有限公司 一种化工原料研磨烘干装置

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US3015392A (en) * 1959-08-14 1962-01-02 Microcyclomat Co Vertical feed centripetal classifier
DE1208984B (de) * 1964-05-21 1966-01-13 Steinmueller Gmbh L & C Vorrichtung zum Verteilen des Mahlgutes bei Schlaegermuehlen
DE2036891C3 (de) * 1970-07-24 1974-08-01 Hosokawa Funtaikogaku Kenkyusho, Osaka (Japan) Pulversichter
JPS51147059A (en) * 1975-06-13 1976-12-17 Nobuo Yoshimori Apparatus for classification
DE2547709A1 (de) * 1975-10-24 1977-05-05 Polysius Ag Vertikalachsiger umluft-windsichter
DE3038625A1 (de) * 1980-10-13 1982-05-19 Fa. Christian Pfeiffer, 4720 Beckum Drehluft-fliehkraft-streusichter
DE3044063A1 (de) * 1980-11-22 1982-07-15 Krupp Polysius Ag, 4720 Beckum Windsichter
US4418871A (en) * 1981-07-15 1983-12-06 P.V. Machining, Inc. Method and apparatus for reducing and classifying mineral crystalline and brittle noncrystalline material
DE3302176A1 (de) * 1983-01-24 1984-07-26 Klöckner-Humboldt-Deutz AG, 5000 Köln Verfahren und anlage zur kontinuierlichen druckzerkleinerung sproeden mahlgutes
DE3426294A1 (de) * 1984-07-17 1986-01-23 Klöckner-Humboldt-Deutz AG, 5000 Köln Zyklonumluftsichter zur sichtung von gut unterschiedlicher korngroesse, insbesondere von zement
GB8518536D0 (en) * 1985-07-23 1985-08-29 Smidth & Co As F L Separator
DE3539512A1 (de) * 1985-11-07 1987-05-14 Krupp Polysius Ag Sichter
DE8606061U1 (de) * 1986-03-05 1986-04-17 Krupp Polysius Ag, 4720 Beckum Vorrichtung zum feinverteilten Einstreuen von Gut in den Sichtraum eines Windsichters
DE3609229A1 (de) * 1986-03-19 1987-09-24 Krupp Polysius Ag Verfahren und anlage zur zerkleinerung von sproedem mahlgut
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
DE3644341A1 (de) * 1986-12-23 1988-07-07 Krupp Polysius Ag Verfahren und anlage zur zweistufigen zerkleinerung von sproedem mahlgut
DE3644342A1 (de) * 1986-12-23 1988-07-07 Krupp Polysius Ag Verfahren und anlage zur zweistufigen zerkleinerung von sproedem mahlgut
FR2610217B1 (fr) * 1987-01-30 1991-08-16 Alsthom Concasseur rotatif a aubes de projection autoprotegees
DE3711926A1 (de) * 1987-04-08 1988-10-27 Kloeckner Humboldt Deutz Ag Einrichtung zur zerkleinerung und mahlung sproeden mahlgutes wie z. b. zementklinker, erz, kohle oder dergleichen
DE3822729A1 (de) * 1988-07-05 1990-01-11 Krupp Polysius Ag Anlage zur zerkleinerung von sproedem mahlgut
DE3823380C2 (de) * 1988-07-09 1994-09-08 Kloeckner Humboldt Deutz Ag Sichter zum Sichten von körnigem, insbesondere agglomeriertem Gut

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992009376A1 (fr) * 1990-11-26 1992-06-11 F.L. Smidth & Co. A/S Separateur double servant a trier des matieres particulaires
TR25513A (tr) * 1990-11-26 1993-05-01 Smidth & Co As F L Tanecik halindeki maddeleri tasnif etmeye mahsus cift katli separatör (ayirici)
EP0519535A1 (fr) * 1991-06-17 1992-12-23 ITALCEMENTI S.p.A. Séparateur dynamique pour matières pulvérulentes, en particulier du ciment, et installation comportant ledit séparateur
EP0629448A3 (fr) * 1993-06-17 1995-02-08 Krupp Polysius Ag Installation et procédé de broyage et de tamisage de matériau friable.
EP0715892A1 (fr) * 1994-12-07 1996-06-12 Krupp Polysius Ag Procédé et installation pour le broyage commun d'au-moins deux substances ayant des caractéristiques de broyage différentes
FR2754475A1 (fr) * 1995-04-14 1998-04-17 Ishikawahima Harima Jukogyo Ka Classificateur de materiau poudreux
US5887725A (en) * 1995-04-14 1999-03-30 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Classifier having a rotatable dispersion plate
WO1998014281A1 (fr) * 1996-09-30 1998-04-09 Colgate-Palmolive Company Turbo-separation de sous-produits animaux
US6193075B1 (en) 1996-09-30 2001-02-27 Colgate-Palmolive Company Air classification of animal by-products
DE102007046834A1 (de) * 2007-09-29 2009-04-02 Holcim Technology Ltd. Verfahren zur Herstellung von hochwertigen Portlandzementen oder von Sonderzementen
DE102007046834B4 (de) * 2007-09-29 2010-01-14 Holcim Technology Ltd. Verfahren zur Herstellung von Hüttensandmehl enthaltenden Zementen
WO2014056974A1 (fr) * 2012-10-10 2014-04-17 Thyssenkrupp Resource Technologies Gmbh Installation de broyage
US9630214B2 (en) 2012-10-10 2017-04-25 Thyssenkrupp Industrial Solutions Ag Grinding mill

Also Published As

Publication number Publication date
EP0374491A3 (fr) 1991-12-11
DE3843338A1 (de) 1990-06-28
ES2050207T3 (es) 1994-05-16
US5024754A (en) 1991-06-18
DE58906996D1 (de) 1994-03-24
EP0374491B1 (fr) 1994-02-16

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