EP0677714B1 - Refroidisseur à grilles poussantes - Google Patents

Refroidisseur à grilles poussantes Download PDF

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Publication number
EP0677714B1
EP0677714B1 EP95102451A EP95102451A EP0677714B1 EP 0677714 B1 EP0677714 B1 EP 0677714B1 EP 95102451 A EP95102451 A EP 95102451A EP 95102451 A EP95102451 A EP 95102451A EP 0677714 B1 EP0677714 B1 EP 0677714B1
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EP
European Patent Office
Prior art keywords
grate
grate plate
cooler
plate
cooling
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
EP95102451A
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German (de)
English (en)
Other versions
EP0677714A1 (fr
Inventor
Gert Dipl.-Ing. Tegtmeier
Manfred Strohbusch
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
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Publication date
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Application filed by Krupp Polysius AG filed Critical Krupp Polysius AG
Publication of EP0677714A1 publication Critical patent/EP0677714A1/fr
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28C—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION
    • F28C3/00—Other direct-contact heat-exchange apparatus
    • F28C3/10—Other direct-contact heat-exchange apparatus one heat-exchange medium at least being a fluent solid, e.g. a particulate material
    • F28C3/12—Other direct-contact heat-exchange apparatus one heat-exchange medium at least being a fluent solid, e.g. a particulate material the heat-exchange medium being a particulate material and a gas, vapour, or liquid
    • F28C3/16—Other direct-contact heat-exchange apparatus one heat-exchange medium at least being a fluent solid, e.g. a particulate material the heat-exchange medium being a particulate material and a gas, vapour, or liquid the particulate material forming a bed, e.g. fluidised, on vibratory sieves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D15/00—Handling or treating discharged material; Supports or receiving chambers therefor
    • F27D15/02—Cooling
    • F27D15/0206—Cooling with means to convey the charge
    • F27D15/0213—Cooling with means to convey the charge comprising a cooling grate
    • F27D15/022—Cooling with means to convey the charge comprising a cooling grate grate plates

Definitions

  • the invention relates to a cooling grate for a cooling grate cooler serving to cool hot items to be cooled, according to the preamble of claim 1.
  • a cooling grate of this type is described in EP-A-167 658, for example with reference to Figures 7 and 8 there.
  • the special feature of this known embodiment is seen above all in the construction of the grate plates, which are referred to there as grate floor elements, and which are approximately box-shaped.
  • Each grate plate is made up of lateral support webs that determine its width and grate bodies arranged on it, the support webs extending from the surface downwards in the manner of cheeks and the bodies that determine the surface (refrigerated goods airfoil) with the formation of fine, transverse gas slots between the Stretches extend.
  • Support webs and grate body can be assembled in the form of two complementary basic components to form a grate plate.
  • the box-like grate plates formed in this way are fastened to the essentially open upper side of the transverse hollow grate plate supports, the grate plates having a cooling gas supply opening in their bottom wall with which they are fitted onto the open side of the associated grate plate support.
  • the bottom wall of each grate plate is obviously connected to the grate plate support - as can only be seen in the illustration in FIG. 7 - by a flange design with flange sections that face one another and lie flat on one another, so that associated connecting elements are obviously only accessible from the inside of the individual grate plate supports.
  • the grate plate supports provided with grate plate transverse rows are alternately fixed at least over a substantial part of the grate length and are arranged to move back and forth in the longitudinal direction of the grate, wherein the grate plates of adjacent longitudinal rows overlap in the longitudinal direction so that during operation the material to be cooled is conveyed along the cooling grate in the longitudinal direction of the cooling grate over the cooling grate surface formed by the grate plates or their upper wings, and a cooling gas, in particular cooling air, flows through from below.
  • a cooling gas in particular cooling air
  • connection channels are provided in this known embodiment between the top of the grate plate carrier and the cooling gas through-openings.
  • These connecting channels are delimited by a base plate that is common to all grate plates, extends over the entire grate plate support and projects from the upper part of the grate plate support in a tongue-like manner, and by lower sections of the individual grate plate side walls, the individual grate plates of each transverse row being fastened approximately flange-like on the associated grate plate support and by outer Screw connections are clamped gas-tight to a unit.
  • the individual grate plates have depressions which are open at the top in their front plate section and in the vertical side surfaces of which cooling gas / cooling gas through-openings open.
  • an upper plate is attached to the top, which has circumferential recesses for better connection of the edges of the grate plates attached to it, the grate plates of a transverse row being screwed onto the upper plate of the associated grate plate support and these upper plates extending over the entire extent of the grate plates extend in the longitudinal direction of the cooling grate, so that they thereby simultaneously form a type of base plate for cooling gas connecting ducts.
  • each hollow grate plate carrier In another known cooling grate (DE-A-37 34 043) a flat cover plate is attached to the top of each hollow grate plate carrier.
  • the front cover plate section viewed in the direction of the refrigerated goods, has individual cooling gas through-openings, wherein flat front plates with cooling gas through openings and angled downwards at the front also rest on this front cover plate section.
  • These flat grate plates are provided with projections reaching down through the cover plate, which engage the tie rods which extend into the interior of the associated grate plate carrier and are clamped there by means of spring-loaded nuts.
  • In the area below the front end of the cover plate there is also a distance bottom wall extending from the grate plate support in the direction of refrigerated goods to limit cooling gas connecting channels formed above it.
  • this base plate in the known designs explained extends over the entire length (in the transverse direction of the cooling grate) of the associated grate plate carrier, but this base plate is only worn out over part of its length, replacing the entire base plate does not only mean a relatively large conversion effort, but also a disproportionate amount of material.
  • this base plate since in these known cooling gratings either a relatively large number of screw connections are required for fastening the grate plates to the grate plate carrier is or these screw connections are attached in the form of tie rod screws within the grate plate carrier, the replacement of worn grate plates requires additional cumbersome and time-consuming assembly work.
  • the invention is therefore based on the object of further developing a cooling grate of the type required in the preamble of claim 1 in such a way that with largely avoiding wear on the grate plate support, on the one hand, a permanent, reliable seal and between the grate plates and the top of the associated grate plate support other a relatively simple and quick assembly and disassembly of the grate plates is guaranteed.
  • each grate plate is at its front plate section, viewed in the direction of the cooling grate conveying the cooling grate, with the formation of the associated cooling gas connecting channel with a hollow box-shaped lower part provided or formed, the bottom wall - viewed in the direction of refrigerated goods - is in gas-tight positive engagement over its rear edge area with an upper edge of the front grate plate longitudinal wall facing it.
  • each grate plate has its own bottom wall in its lower part designed as a cooling gas connection channel. If worn grate plates and thus correspondingly worn bottom wall areas or bottom walls of the associated cooling gas connecting channel therefore have to be replaced in particularly wear-prone transverse regions of the cooling grate, then only the respective grate plate with its one-piece bottom part and the one-piece, preferably cast-on bottom wall need for the area of this worn grate plate to be replaced.
  • At least one receiving part is provided on the underside of a rear plate section of each grate plate, in which no cooling gas through-openings are generally provided firmly attached, in particular - in the case of cast grate plates - is firmly cast on, on which the head part of a clamping screw engages, for example is hooked on, which in turn - viewed in the direction of the refrigerated goods - reaches out through the rear longitudinal wall of the associated grate plate carrier and clamped there by a screw nut is.
  • the rear edge region of the bottom of each grate plate lower part has a recess open to the front grate plate longitudinal wall with the cross-sectional shape of approximately half a dovetail recess, into which the correspondingly shaped upper edge of the front longitudinal wall of the grate plate support engages.
  • This form-fit engagement thus formed can then be used to transmit the thrust force required for the feed (during the back and forth movement of the corresponding grate plate carrier with the grate plates attached to it) to the individual grate plates.
  • the shape of this interlocking engagement counteracts a folding up of the associated grate plate during the aforementioned feed movement.
  • the grate plate is braced obliquely downwards on the one hand against the top of the grate plate support and on the other hand with the rear edge region of its bottom wall against the correspondingly shaped upper edge of the front longitudinal wall of the grate plate support, as has already been explained above.
  • the partial longitudinal sectional view according to FIG. 1 shows the overall structure of the cooling grate, which is essential for the explanation of the present invention, within an associated moving grate cooler, which is intended for cooling hot items to be cooled, for example previously fired cement clinker, ore material or the like.
  • the cooling grate according to the invention contains a number of grate plate supports 1, 1 'of essentially the same construction, of which only three (in their cross section) are illustrated in the drawing.
  • These grate plate carriers 1, 1 ' run transversely to the cooling grate, i.e. as shown in Figure 1 perpendicular to the plane of the drawing.
  • the grate plate carrier 1, 1 ' are arranged in parallel and at a corresponding distance from each other.
  • Each grate plate carrier 1, 1 ' is - as shown in FIGS. 1 and 2 - designed as a hollow body and connected to a cooling gas supply line 2 or 2', only indicated in FIG. 1, via which, from any suitable source, as at known - cooling gas, in particular cooling air according to the arrows 3 is supplied to the interior of the grate plate carrier 1, 1 '.
  • the grate plate supports are held in a manner known per se, alternately in a fixed manner at least over the largest part of the cooling grate length, or are movable back and forth in the longitudinal direction of the cooling grate on corresponding supports (not shown here).
  • the central grate plate support 1 can be moved back and forth in the direction of the double arrows 4, while the two grate plate supports 1 'arranged in front of and behind it are each held stationary or stationary, in which the only difference between the illustrated grate plate supports 1 and 1 ' consists.
  • the cooling grate according to the invention also contains a plurality of grate plates 5 which are likewise of identical design and are each arranged in transverse rows running transversely to the cooling grate - and thus perpendicular to the plane of the drawing in FIG (Arrow 7) facing front plate sections 5a opening cooling gas through openings 8.
  • the grate plates 5 of each transverse row are closely arranged in a manner known per se, and each grate plate transverse row is sealed by means of screw connections 9 on an associated grate plate support 1 or 1 ′ - with a corresponding distance between the grate plate supports from one another - so that in cooling grate In the longitudinal direction (from left to right in the drawing plane of FIG. 1), adjacent rows of grate plates overlap each other in a scale-like manner (approximately according to FIG. 1).
  • cooling gas connecting channels 10 are also formed in order to supply cooling gas or cooling air in accordance with the arrows 3 from Inside the grate plate carrier 1, 1 'to the cooling gas through openings 8 of the associated grate plates 5 can forcibly feed.
  • the cooling gas emerging from the cooling gas through openings 8 on the cooling goods support surfaces 6 thus reaches the layer of hot cooling goods conveyed along the grate plates 5 in the direction of arrow 7 and thus along the cooling grate, in order to cool the latter in a manner known per se .
  • each grate plate 5 is formed with a hollow box-shaped lower part 11 on its front plate section 5a, forming the associated cooling gas connecting channel 10 already mentioned , whose approximately plate-shaped bottom wall 11a - viewed in the direction of refrigerated goods (arrow 7) - is in gas-tight form-locking engagement over its rear edge region 11a 'with an upper edge 12a of the front longitudinal wall 12 of the associated grate plate carrier 1, 1' facing it.
  • each grate plate 5 at least one receiving part 13 for the head part 14a of a clamping screw 14 is firmly attached, when executed the grate plates 5 are integrally formed as castings.
  • the tensioning screw 14 is passed obliquely downwards and outwards through the rear longitudinal wall 15 of the associated grate plate carrier 1, 1 ′ and clamped there by a screw nut 16.
  • Edge region 11a 'of the bottom wall 11a of each grate plate has a recess 17 which is open towards the front longitudinal wall 12 of the associated grate plate carrier 1, 1' and has the cross-sectional shape of approximately half a dovetail recess (with a corresponding undercut).
  • the upper edge 12a of the front grate plate longitudinal wall 12, which preferably projects upward and outward, has an outer edge 12a ′ which is approximately wedge-shaped in cross section and corresponds to the recess 17, with which the upper edge 12a engages in the recess 17 in a form-fitting and completely sealed manner.
  • a fork-shaped recess 18 is preferably in the area at the rear edge region 11a' of the lower part bottom wall 11a the middle of the panel, worked in or molded on.
  • the grate plates 5 which are adjacent to one another lie closely against one another in each transverse row or on the associated grate plate carrier 1, 1 '.
  • narrow gaps may remain between adjacent grate plates 5 or the two adjacent side walls of two adjacent grate plates, into which possibly fine refrigerated goods can penetrate.
  • each grate plate support 1, 1' has support webs 20 which run in the longitudinal direction of the cooling grate and are flush with their top side 1a, on which Two grate plates 5, which are adjacent to one another in the associated transverse row, are supported gas-tight with their closely abutting longitudinal sides 5c, 5d. Accordingly, the supporting webs 20 are arranged at the upper end of each grate plate carrier 1, 1 'in the transverse direction of the cooling grate (FIG. 4) at a distance from one another which corresponds to the distance between the grate plate longitudinal walls 5c and 5d (FIG. 3).
  • each receiving part is 13 formed on the underside of the rear grate plate sections 5b by a receiving fork, which is preferably formed in one piece in the case of cast grate plates.
  • each clamping screw 14 is formed by a commercially available hammer head screw, the screw or.
  • the head part 14a is detachably but non-rotatably hooked into the receiving fork 13, ie when the tensioning screw 14 is inserted, it is inserted axially between the fork cams or the like into the receiving fork 13, rotated about 90 ° about its longitudinal axis and then secured against rotation by axial retraction or mounted.
  • This tensioning screw 14 is, as shown in FIGS. 1 and 2, guided downwards and obliquely through an oblique bore 23 provided in the rear longitudinal wall 15 of the grate plate carrier 1, 1 '.
  • This oblique bore 23 is machined into an abutment eye 24 formed on the outside of this longitudinal wall.
  • the screw nut 16 is screwed onto the threaded section 14b of the clamping screw 14 projecting outward from the oblique bore 23 and is supported on an outer abutment surface 24a of the abutment eye 24 by means of a suitable compression spring, preferably a disk spring assembly 25.
  • all grate plates 5 can not only be screwed or clamped on the associated grate plate carrier 1, 1 'in a completely gas-tight and tilt-proof manner, but can also be braced, but that the grate plates 5 can be used if necessary, especially if they do Wear or in the event of corresponding damage, simply by loosening the screw nut 16 which is easily accessible from the outside of each grate plate carrier 1, 1 'and can be replaced, namely as a unit with the grate plate lower part 11 designed in the form of a cooling gas connecting channel, including the associated bottom wall 11a, which is also exposed to wear.
  • At least one separately attached, strip-like ventilation cap 26 is located in the upper part located above the hollow box-shaped lower part 11 of each grate plate 5, and only in the front grate plate section 5a is attached that the cooling gas through openings 8 provided in this front grate plate section 5a open out in the form of at least one essentially closed annular gap on the cooling gas support surface 6 at the top.
  • two such cooling gas passage openings 8 in the form of an annular gap are indicated by dashed lines.
  • these cooling gas through-openings 8 act approximately in the form of annular gap nozzles, the effect of which on the cooling gas flowing through can be adjusted by appropriate adjustment or shaping of the ventilation cover caps 26.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Details (AREA)
  • Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)

Claims (8)

  1. Grille de refroidissement destinée à un refroidisseur à grilles poussantes destiné au refroidissement de matière chaude, comprenant
    a) plusieurs supports de plaques de grille (1, 1') orientés perpendiculairement à la grille de refroidissement et parallèlement et à distance les uns des autres, qui sont réalisés sous forme de corps creux et sont raccordés à des conduits d'arrivée de gaz de refroidissement (2, 2'),
    b) de multiples plaques de grille (5) fixées hermétiquement en rangées transversales sur les supports de plaques de grille, qui comportent dans des surfaces supérieures (6) de support de la matière à refroidir des trous (8) de passage du gaz de refroidissement au moins dans la partie antérieure (5a) des plaques qui est tournée dans le sens de transport (7) de la matière à refroidir, les rangées transversales de plaques de grille qui sont voisines dans la direction de la longueur de la grille de refroidissement se chevauchant,
    c) des canaux de liaison (10) destinés à une arrivée forcée de gaz de refroidissement (3) de l'intérieur du support de plaques de refroidissement dans les trous de passage de gaz de refroidissement, ces canaux étant prévus dans la région comprise entre le côté supérieur au moins partiellement ouvert (1a) du support de plaques de grille (1, 1') et les trous de passage de gaz de refroidissement (8) des plaques correspondantes de grille (5), chaque plaque de grille comportant une partie inférieure (11) en forme de caisson creux équipé d'une paroi de fond (11a) dans sa partie antérieure (5a) de manière à former le canal correspondant de liaison (11) pour le gaz de refroidissement,
       caractérisée par les particularités suivantes :
    d) la paroi de fond (11a) de chaque partie inférieure de plaque de grille (11) est en prise d'hermétisme par complémentarité de formes par sa partie de bord arrière (11a') - considérée dans le sens de transport de la matière à refroidir (7) - avec un bord supérieur (12a) de la paroi longitudinale antérieure (12) du support de plaque de grille qui est tournée vers elle ;
    e) au moins une partie (13) de logement de la partie de tête (14a) d'une vis de fixation (14) est assujettie au côté inférieur d'une partie arrière (5b) de chaque plaque de grille (5), cette vis traversant la paroi longitudinale arrière (15) du support de plaque de grille pour se prolonger vers l'extérieur et être fixée par un écrou (16).
  2. Grille de refroidissement selon la revendication 1, caractérisée en ce que la partie de bord arrière (11a') de la paroi de fond (11a) de la partie inférieure (11) de la plaque de grille comporte un évidement (17) ouvert vers la paroi longitudinale antérieure (12) du support de plaque de grille et ayant en coupe transversale à peu près la forme d'un demi-évidement en queue d'aronde dans lequel pénètre le bord supérieur (12a) de cette paroi longitudinale antérieure (12) qui a une forme correspondante.
  3. Grille de refroidissement selon la revendication 2, caractérisée en ce qu'un évidement en forme de fourche (18) est prévu dans la partie arrière (11a') du bord de la paroi de fond (11a) de la partie inférieure - de préférence dans la région du milieu de la longueur de la plaque -, évidement dans lequel pénètre par complémentarité de formes un tenon de guidage (19) saillant vers le haut sur le bord supérieur (12a) de la paroi antérieure longitudinale (12) du support de plaques de grille en formant un guide transversal pour la plaque de grille (5).
  4. Grille de refroidissement selon la revendication 1, caractérisée en ce que chaque support (1, 1') de plaque de grille comporte des nervures de support (20) orientées dans la direction de la longueur de la grille de refroidissement et aboutissant à fleur de son côté supérieur (1a), deux plaques de grille (5) voisines dans une rangée transversale correspondante prenant appui hermétiquement sur chacune de ces nervures de support (20) par leurs côtés longitudinaux (5c, 5d) qui sont étroitement en appui l'un contre l'autre.
  5. Grille de refroidissement selon la revendication 1, caractérisée en ce que chaque plaque de grille (5) comporte dans la région de sa paroi de fond (11a) et sur l'un de ses côtés longitudinaux (5d) un élargissement en forme de tringle (21) qui est saillant sur ce côté longitudinal en direction transversale, ainsi que sur son autre côté longitudinal opposé (5c) un évidement (22) venu de moulage et dont la section est adapté à celle de l'élargissement, de manière que les élargissements et évidements disposés face à face de deux plaques de grilles assemblées dans une rangée transversale s'emboîtent hermétiquement.
  6. Grille de refroidissement selon la revendication 1, caractérisé en ce que la partie de logement (13) située sur le côté inférieur de chaque partie arrière (5b) de plaque de grille est formée d'une fourche de logement - de préférence venue de moulage - et la vis de fixation (14) est formée d'une vis à tête fraisée du commerce dont la tête (14a) est accrochée de manière amovible à la fourche de logement, toutefois en étant empêchée de tourner.
  7. Grille de refroidissement selon la revendication 1, caractérisée en ce que la vis de fixation (14) passe obliquement dans un trou oblique (23) prévu dans la paroi longitudinale arrière (15) du support de plaque de grille et usiné dans un oeillet d'appui (24) venu de moulage sur cette paroi longitudinale, l'écrou (16) prenant appui contre la surface extérieure (24a) de l'oeillet d'appui par l'intermédiaire d'un ressort de compression, de préférence, d'un empilement de ressorts Belleville (25).
  8. Grille de refroidissement selon la revendication 1, caractérisée en ce qu'au moins une coiffe de couverture de ventilation (26) en forme de barre fixée individuellement est ajustée dans la partie supérieure se trouvant au-dessus de la partie inférieure en forme de caisson creux (11) de chaque plaque de grille (5), de manière que les trous (8) de passage de gaz de refroidissement débouchent vers le haut sous la forme d'un interstice en forme d'anneau sensiblement fermé sur la surface (6) de support de la matière à refroidir.
EP95102451A 1994-04-14 1995-02-21 Refroidisseur à grilles poussantes Expired - Lifetime EP0677714B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4412885 1994-04-14
DE4412885A DE4412885A1 (de) 1994-04-14 1994-04-14 Kühlrost

Publications (2)

Publication Number Publication Date
EP0677714A1 EP0677714A1 (fr) 1995-10-18
EP0677714B1 true EP0677714B1 (fr) 1997-07-16

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP95102451A Expired - Lifetime EP0677714B1 (fr) 1994-04-14 1995-02-21 Refroidisseur à grilles poussantes

Country Status (6)

Country Link
US (1) US5549471A (fr)
EP (1) EP0677714B1 (fr)
DE (2) DE4412885A1 (fr)
DK (1) DK0677714T3 (fr)
ES (1) ES2103614T3 (fr)
ZA (1) ZA951636B (fr)

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DE102015015632B4 (de) * 2015-12-03 2017-12-07 Khd Humboldt Wedag Gmbh Rostplatte für einen Rostkühler
DE102018118275A1 (de) * 2018-07-27 2020-01-30 Valeo Siemens Eautomotive Germany Gmbh Rotoranordnung für eine elektrische Maschine, elektrische Maschine für ein Fahrzeug und Fahrzeug
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DE3708220A1 (de) * 1987-03-13 1988-09-22 Krupp Polysius Ag Verfahren und anlage zur ausnutzung der heizenergie von haus- und gewerbemuell
DE3734043A1 (de) * 1987-10-08 1989-04-20 Kloeckner Humboldt Deutz Ag Rostkuehler zum kuehlen von heissem schuettgut
DE3812425A1 (de) * 1988-04-14 1989-10-26 Peters Ag Claudius Kuehlerrostplatte
DE9108470U1 (de) * 1991-07-09 1991-08-29 Krupp Polysius Ag, 4720 Beckum Schubrostkühler
DE4134242A1 (de) * 1991-10-16 1993-04-22 Krupp Polysius Ag Kuehlrost
DE4136934C2 (de) * 1991-11-11 2001-03-29 Deutz Ag Schubrostkühler zum Abkühlen von heißem Gut
TW242137B (fr) * 1991-11-27 1995-03-01 Terao Masahisa
DE4242374A1 (fr) * 1992-01-31 1993-08-05 Kloeckner Humboldt Deutz Ag
KR0144286B1 (ko) * 1992-05-19 1998-08-17 존 에이. 아로그나 제어식 공기 격자판

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ES2103614T3 (es) 1997-09-16
US5549471A (en) 1996-08-27
DE4412885A1 (de) 1995-10-19
DE59500379D1 (de) 1997-08-21
DK0677714T3 (da) 1998-02-23
ZA951636B (en) 1995-12-11
EP0677714A1 (fr) 1995-10-18

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