EP0318053B1 - Procédé et dispositif pour séparer un mélange de grains - Google Patents

Procédé et dispositif pour séparer un mélange de grains Download PDF

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Publication number
EP0318053B1
EP0318053B1 EP88119819A EP88119819A EP0318053B1 EP 0318053 B1 EP0318053 B1 EP 0318053B1 EP 88119819 A EP88119819 A EP 88119819A EP 88119819 A EP88119819 A EP 88119819A EP 0318053 B1 EP0318053 B1 EP 0318053B1
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EP
European Patent Office
Prior art keywords
air
stratification
vibratory unit
box
grain
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
EP88119819A
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German (de)
English (en)
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EP0318053A1 (fr
Inventor
Roman Müller
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Buehler AG
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Buehler AG
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Filing date
Publication date
Priority claimed from CH1110/88A external-priority patent/CH676209A5/de
Application filed by Buehler AG filed Critical Buehler AG
Priority to AT88119819T priority Critical patent/ATE101544T1/de
Publication of EP0318053A1 publication Critical patent/EP0318053A1/fr
Application granted granted Critical
Publication of EP0318053B1 publication Critical patent/EP0318053B1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B4/00—Separating by pneumatic tables or by pneumatic jigs
    • B03B4/02—Separating by pneumatic tables or by pneumatic jigs using swinging or shaking tables
    • 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
    • B07B9/00—Combinations of apparatus for screening or sifting or for separating solids from solids using gas currents; General arrangement of plant, e.g. flow sheets
    • B07B9/02—Combinations of similar or different apparatus for separating solids from solids using gas currents

Definitions

  • the invention relates to a method and a device for separating grain mixtures according to the preamble of claims 1 and 8 respectively.
  • a grain separating device operating in recirculation mode which essentially consists of a vibrating table surface and a stationary box completely enclosing the table surface.
  • the stationary box In its lower area, the stationary box has a fan, by means of which the air is blown upwards through the table surface.
  • the air flowing out from the top of the table surface is directed laterally between the swinging table surface and the walls of the stationary box back into the fan inlet.
  • the air is conveyed in a cycle, which is referred to as recirculation mode and has the advantage that complex aspiration systems with corresponding filter devices for the stratified air are eliminated.
  • Such air recirculation systems have so far only been able to establish themselves to a very limited extent.
  • a crucial disadvantage is the accumulation of dust, dirt and shell parts within the stationary box.
  • the devices of this type are predominantly those for separating grain and other seeds from outside stock, e.g. 1-2% third-party stocking is quite common. With throughputs of e.g. 5-20 t / h result in correspondingly large quantities even for the annoying small stock.
  • These air recirculation systems therefore place higher demands on the operator, especially since the cleaning effort required to comply with the hygiene requirements is relatively large.
  • Another problem with the known air recirculation devices is that dust-containing air can escape into the environment due to insufficient control of the pressure conditions.
  • the separate return duct ensures that the air flow in the area of the shift table remains practically uninfluenced by the returned air and that a relatively high separation quality can be achieved.
  • deposits of dust or the like can form in the extensive, stationary duct system, which overall leads to a relatively high cleaning effort. Since the device has to be switched off frequently for cleaning purposes, there is inevitably also losses in throughput.
  • the static, external feedback takes up a relatively large amount of space, particularly as a result of the required distance from the vibration unit.
  • the aim of the invention is to create a further method and a further device of the type mentioned at the outset, in which in particular the accumulation of dust deposits and the like is reduced to a minimum with the simplest means while maintaining the highest possible separation quality.
  • the object is achieved in that the return channel is set in vibration together with the vibration unit.
  • the return duct is also permanently set in vibration in such a way that no dust deposits can occur on its walls from the outset and all of the dust and the like are entrained by the air flow in the return duct becomes.
  • a separate return duct is provided and thus the recirculated air in particular is also guided separately from the air discharge space despite the assignment of the return duct to the vibration system, an optimal product stratification and thus a high separation quality are still guaranteed at all times.
  • the air flow that is decisive for the product stratification is in no way influenced by the air returned via the separate duct. Because of the method according to the invention, not only is a high degree of grain separation, in particular of stone reading, achieved. In addition, little air is required and simple operation, which is particularly insensitive to fluctuations in throughput, is ensured.
  • the grain is fed as a wide-area stream into the area of the higher table end, the exhaust air is removed in the middle at the top and the supply air is supplied again over a large area in the area of the lower shift table end.
  • each of the functions can be set to a respective maximum, which was previously only possible with complex individual machines without recirculation mode.
  • the air recirculation by means of a circulating air supply or return duct which runs around the lower end of the table and opens out under it over a wide area ensures optimal flow conditions.
  • An appropriately widened, cascade-like, oscillating product feed or product feed ensures a full spreading and loosening of the product right from the start, while at the same time fulfilling the function of an airlock.
  • the installation of the product feed cascade in the area of the higher table end ensures unobstructed and therefore easily controllable flow conditions not only through the shift table, but also above the entire shift table area.
  • the circulating air is guided from and to the stratified operation in a shock-free and essentially vortex-free manner.
  • the circulating air can then be cleaned in stationary facilities as required. Since the corresponding air remains in the circuit, mechanical cleaning or filtering is sufficient. However, it is also possible to pass a small proportion of the circulating air into a dust filter, the entire system remaining under negative pressure to the outside.
  • the object is achieved in that the return channel is assigned to the vibration unit and can be set in vibration together with the latter.
  • the fine dust simply passes through the device.
  • An easy to control swingarm box can be formed, on which each Function receives a clear local assignment.
  • the material feed is preferably arranged on the side of the higher end of the shift table.
  • the shift tables for service work can expediently be pulled out on this side.
  • the air return is preferably attached to the other lower end side. This can be designed as a flat channel, which ensures that the outflowing air enters the lower table surface in a vortex-free manner.
  • the air extraction is preferably installed in the middle upper region of the box.
  • the good and fluid connection of the vibrating parts with the stationary parts can be achieved, for example, with round fabric or rubber sleeves, as has been proven in practice with many vibrating machines.
  • One or two table surfaces can advantageously be arranged in one and the same box-like vibration unit, the lower table taking over part of the goods of the upper table and the product transfer preferably taking place at the higher table end.
  • the upper table surface can also - if necessary even additionally - have a trough-shaped depression (stone or manor swamp) with through-openings in the trough bottom to separate the product flow into a heavy and a light fraction.
  • a trough-shaped depression stone or manor swamp
  • through-openings in the trough bottom to separate the product flow into a heavy and a light fraction.
  • the transfer of goods from the upper to the lower table takes place via a slide arranged in the opposite direction to the main flow direction of the upper table, which leads to the lower table.
  • the layer table 3 When viewed in plan, the layer table 3 preferably has an at least approximately rectangular shape.
  • the product transfer point extends across the full table width.
  • the formation of a wide-area crop stream 20, also known as crop curtain, for the feed of crops takes place in two stages.
  • the fresh grain is fed into one of the vibrating hood 5 associated distribution box 17, which together with a guide plate 19, a material feed 17; 19 forms.
  • the vibrations of the hood 5 promote the uniform, wide distribution of the grain in the distribution box 17, which, in order to reinforce this effect, is widened in a cascade-like manner.
  • a stowage flap 18 also provided in the distribution box 17, so that the grain material is already passed as a wide-area product stream directly onto the guide plate 19 which extends over the entire table width and then as a uniform, wide-area crop flow 20 onto the shift table 3.
  • the widespread spread of the material flow 20 is further supported by the fact that the guide plate 19 has an overflow edge 16 at its free end, that is to say it is trough-shaped.
  • the layer table 3 is constructed as a so-called sandwich construction, ie it has on its upper side a rough mesh grid serving as a product support, which is carried by honeycomb-shaped baking strips which are held downwards by a fine perforated plate (not shown). In the individual fields formed between the metal strips, cleaning bodies are arranged which keep both the mesh and the perforated plate clean (not shown). It is essential that the perforated plate has an air resistance that is much larger than that of the mesh, z. B. in the order of 1: 10. With this measure, the air distribution can be independent of the layer thickness on the mesh on the entire surface of the layer table 3 are kept approximately constant.
  • the material stratification itself consists essentially of three different layers, a lower, heavy layer containing the heavy admixtures being conveyed upwards by the mechanical throwing motion on the layer table 3.
  • a light layer which has been freed from the heavy admixtures is kept at a distance above the mesh grid of the layer table 3 not only in the loose state but also in the suspension by the targeted air flow. Since the latter is slightly inclined and the upper light layer does not receive a feed impulse directed directly up the table, but is kept in vibration, it swims towards the lower side of the table.
  • the inclination of the shift table 3 can be adjusted by an adjusting device 35.
  • a third stratification consists of the actual heavy admixtures, mostly only individual particles, individual foreign bodies, stones, etc. The heavy goods with the stones sink immediately onto the vibrating table surface and move through the vibrations and the mesh-like, rough surface of the layer table 3 on the same up the table.
  • the material is prevented from moving further upwards by the air flow.
  • the stones can continue their movement to the higher end of the shift table 3.
  • the same blow-back flow causes a clearly established flow front or reversal of flow direction.
  • the stream of material freed from stones is lifted off the table surface by the strong air flow 31 and now flows freely together with all light goods with the upper, lifted light layer down the table.
  • the lightest fraction is discharged immediately at outlet 4; a medium grain fraction can possibly make a circular traveling movement up-table-down several times, which is particularly true for boundary grains.
  • both shift tables 3a and 3b have the same structure, e.g. B. as in Fig. 1.
  • the blow-back flow is missing at the upper stratification table 3a, so that not only the heaviest admixtures but the whole heavy stratification are moved up the table and can fall onto the guide plate 19 through a discharge channel 40 via a steering plate 41. From the guide plate 19, the mode of operation of the shift table 3b is identical to that of the shift table 3 of FIG. 1.
  • a guide plate 42 is arranged at the uppermost point between the distribution box 17 and the shift table 3a.
  • the flowing material stream 20 is drained via a product transfer 43 serving as a product or product lock directly into an outlet channel 44 of the lower layer table 3b.
  • the two streams of material from the two shift tables 3a and 3b freed from the heaviest admixtures are then brought together again in the outlet 4.
  • All heaviest admixtures, such as stones, etc. are separated from the uppermost layer table 3a together with the heavy layer first.
  • the actual separation and the separate removal of the stones via a stone lock (not shown) then takes place on the lower layer table 3b.
  • the stone selection takes place here in two temporally and spatially separated stages. This is because a concentrate is first formed with all heavy goods, e.g. B. 30% to 60% of the entire material throughput on the upper shift table 3a and only from the reduced material throughput the stones and other heaviest additions are read out and carried away separately.
  • the small table readers of FIGS. 1 and 2 also contain a box 50 which is completely closed and which can be passed through or through the shift tables 3; 3a and 3b is divided into an upper suction or air discharge space 51 and a lower suction or air supply space 52. Laterally at the lower end of the shift table 3 or the shift tables 3a; 3b there is a circulating air or return duct 53 which is connected to an air return line 55 via a flexible hose or a sleeve 54 and an air return pipe 55 '. An air flow restrictor 56 is arranged in the air return line 55.
  • the one with the shift table 3 or the shift tables 3a; 3b and the hood 5, a box 50 forming an oscillation unit 50 itself is supported on the stationary frame 10 via the spring elements 9.
  • an inlet spigot 2 ' connected to the inlet 2 at one end, approximately in the middle an air outlet 13' also connected to the air suction line 13, and an air return socket 55 connected to the air return line 55 on the opposite end side 'arranged.
  • the previously mentioned nozzle 2 '; 13 '; 55 ' are connected via flexible sleeves 15 or the flexible hose 54 on the one hand to the non-oscillating head piece 12 and on the other hand to the box-like oscillation unit 50 in order to be able to participate in the oscillation movement in this way.
  • two outlets 4 are arranged as tubular product channels 57 on both sides (perpendicular to the image plane), so that the remaining space between the two product channels 57 remains for the recirculation or return channel 53.
  • the box-like vibration unit 50 is framed in Figures 1 and 2 for better identification with a dashed line.
  • FIG. 3 additionally shows a circulating air separator 60 with a suction fan 61 and a motor drive 62.
  • the nozzle-like air suction line 13 leads directly into the circulating air separator 60, the essential or disruptive part of fine shells and dust being removed from the air flow via a dust discharge line 64.
  • air purification is advantageous because it can effectively avoid dust accumulation in the entire device and increase operational safety and hygiene.
  • air purification is advantageous because it can effectively avoid dust accumulation in the entire device and increase operational safety and hygiene.
  • a minimal amount of air e.g. B. 10% of the circulating air volume must be passed through fine dust filters.
  • an aspiration connection 65 is provided.
  • the circulating air separator 60 can be attached directly to the ceiling 66 with a fan.
  • Fig. 4 shows a device which differs from the aforementioned small table readers only in that a recirculation or return duct 53 'is arranged separately in the box-like vibration unit 50 and an influence on the flow conditions of the air within the box-like vibration unit caused thereby 50 can be avoided.

Landscapes

  • Combined Means For Separation Of Solids (AREA)

Claims (18)

  1. Procédé de séparation de mélanges de grains, notamment de tri de constituants plus lourds, tels que pierres (28) ou analogues, à partir du grain, selon lequel le grain est guidé essentiellement au-dessus d'une table de mise en couche (3, 3a, 3b, 3c, 3d) qui est inclinée et est traversée par de l'air et à laquelle est associée une unité vibrante (50) qu'elle divise en une chambre inférieure d'amenée d'air (52) et une chambre supérieure d'évacuation d'air (51), lesquelles chambres sont prévues pour de l'air de mise en couche qu'on fait circuler sous forme d'air de recyclage et qui est ramené de la chambre d'évacuation d'air (51) à la chambre d'amenée d'air (52) par l'intermédiaire d'un conduit de retour (53, 53') séparé, caractérisé en ce que le conduit de retour (53, 53') est mis en vibrations en commun avec l'unité vibrante (50).
  2. Procédé suivant la revendication 1, caractérisé en ce qu'une unité vibrante (50) en forme de caisson est utilisée en tant qu'unité vibrante englobant la table de mise en couche (3, 3a, 3b, 3c, 3d) et le conduit de retour (53).
  3. Procédé suivant l'une des revendications 1 et 2, caractérisé en ce que la circulation d'air recyclé est entretenue au moyen d'un ventilateur fixe (61) qui est disposé au-dessus d'une plate-forme fixe (12) située au-dessus de l'unité vibrante (50).
  4. Procédé suivant une ou plusieurs des revendications précédentes, caractérisé en ce qu'il est utilisé au moins deux tables de mise en couche (3a, 3b ; 3c, 3d) traversées par l'air recyclé et en ce qu'une partie du mélange de grains est transférée à la table de mise en couche (3b, 3d) inférieure.
  5. Procédé suivant une ou plusieurs des revendications précédentes, caractérisé en ce que le grain est introduit sous la forme d'un flux à large surface dans la zone de l'extrémité la plus haute de la table, en ce que l'air sortant est évacué à la partie supérieure et au milieu et en ce que l'air entrant est introduit, également suivant une surface large, dans la zone de l'extrémité inférieure de la table de mise en couche.
  6. Procédé suivant une ou plusieurs des revendications 2 à 5, caractérisé en ce que le grain est introduit sous la forme d'une chute de nature uniforme et s'étendant sur toute la largeur de la table et en ce que l'amenée de matière (17, 19) prévue à cet effet est reliée rigidement à l'unité vibrante (50) et est réalisée sous la forme d'une cascade s'élargissant de haut en bas.
  7. Procédé suivant une ou plusieurs des revendications précédentes, caractérisé en ce que l'air recyclé est épuré de ses constituants de poussières, dans la zone située au-dessus de l'évacuation centrale d'air (13'), dans des éléments disposés d'une manière fixe.
  8. Dispositif de séparation de mélanges de grains, notamment de tri de constituants plus lourds, tels que pierres (28) ou analogues, à partir du grain, comprenant une table de mise en couche (3, 3a, 3b, 3c, 3d) qui est inclinée et est perméable à l'air et à laquelle est associée une unité vibrante (50) qu'elle divise, pour l'air de mise en couche déplacé en tant qu'air recyclé, en une chambre inférieure d'amenée d'air (52) et une chambre supérieure d'évacuation d'air (51), ainsi qu'un conduit de retour (53, 53') séparé qui sert au retour de l'air recyclé et est disposé entre la chambre d'évacuation d'air (51) et la chambre d'amenée d'air (52), caractérisé en ce que le conduit de retour (53, 53') est associé à l'unité vibrante (50) et est agencé de façon à pouvoir être mis en vibrations en commun avec cette dernière.
  9. Dispositif suivant la revendication 8, caractérisé en ce que l'unité vibrante (50) est réalisée en forme de caisson et en ce que le conduit de retour (53, 53'), qui est disposé, de même que la table de mise en couche (3, 3b, 3d), à l'intérieur du caisson, débouche dans une zone située près de l'extrémité la plus basse de la table de mise en couche (3, 3b, 3d).
  10. Dispositif suivant l'une des revendications 8 et 9, caractérisé en ce que l'unité vibrante (50) en forme de caisson englobe une amenée de matière (17, 19) qui est réalisée en cascade et s'élargit de haut en bas et qui est disposée dans la zone de l'extrémité la plus haute de la table.
  11. Dispositif suivant une ou plusieurs des revendications 8 à 10, caractérisé en ce que, sur la face supérieure de l'unité vibrante (50) en forme de caisson, il est disposé, à une extrémité : une tubulure d'entrée de matière (2'), approximativement au milieu : une tubulure (13') d'évacuation d'air par aspiration et, à l'extrémité opposée : une tubulure (55') de retour d'air.
  12. Dispositif suivant une ou plusieurs des revendications 8 à 11, caractérisé en ce qu'à l'intérieur de l'unité vibrante (50) en forme de caisson, il est disposé au moins deux tables de mise en couche (3a, 3b, 3c, 3d) superposées et traversées de bas en haut par l'air recyclé et en ce qu'il est prévu un transfert de produit (40, 19 ; 43 ; 71 ; 72 ; 81, 84) servant au transfert d'une partie du grain de la table supérieure (3a, 3c) sur la table inférieure (3b, 3d).
  13. Dispositif suivant une ou plusieurs des revendications 8 à 12, caractérisé en ce que l'amenée de matière (17, 19) et/ou le transfert de produit (40, 19) débouchent sur toute la largeur de la table de mise en couche (3, 3b, 3d) et comportent, dans la zone où il ou elle débouche, une tôle de guidage (19) disposée à distance au-dessus de la table de mise en couche (3, 3b, 3d).
  14. Dispositif suivant une ou plusieurs des revendications 8 à 13, caractérisé en ce que l'unité vibrante (50) en forme de caisson est montée, de façon à pouvoir vibrer, sur un bâti (10) qui, dans sa zone supérieure, comporte un élément de tête (12) fixe et réalisé de préférence sous la forme d'une plate-forme.
  15. Dispositif suivant la revendication 14, caractérisé en ce que des manchons flexibles (15, 54) sont disposés entre l'élément de tête (12) fixe, d'une part, et la tubulure (13') d'évacuation d'air par aspiration ou la tubulure (55') de retour d'air, ainsi que la tubulure (2') d'entrée de matière de l'unité vibrante (50) en forme de caisson, d'autre part.
  16. Dispositif suivant l'une des revendications 14 et 15, caractérisé en ce qu'un séparateur d'air recyclé (60) est disposé au-dessus de l'élément de tête (12) fixe.
  17. Dispositif suivant la revendication 16, caractérisé en ce que le séparateur d'air recyclé (60) est relié à un ventilateur d'aspiration (61) et à une tuyauterie d'évacuation de poussières (64).
  18. Dispositif suivant une ou plusieurs des revendications 8 à 17, caractérisé en ce que le conduit de retour (53) est relié à un raccord d'aspiration (65) prévu pour un filtre à poussières fines.
EP88119819A 1987-11-27 1988-11-28 Procédé et dispositif pour séparer un mélange de grains Expired - Lifetime EP0318053B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88119819T ATE101544T1 (de) 1987-11-27 1988-11-28 Verfahren und vorrichtung zum trennen von korngemisch.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CH4626/87 1987-11-27
CH462687 1987-11-27
CH1110/88 1988-03-24
CH1110/88A CH676209A5 (en) 1988-03-24 1988-03-24 Stone separator system from grain

Publications (2)

Publication Number Publication Date
EP0318053A1 EP0318053A1 (fr) 1989-05-31
EP0318053B1 true EP0318053B1 (fr) 1994-02-16

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Application Number Title Priority Date Filing Date
EP88119819A Expired - Lifetime EP0318053B1 (fr) 1987-11-27 1988-11-28 Procédé et dispositif pour séparer un mélange de grains
EP88119820A Expired - Lifetime EP0318054B1 (fr) 1987-11-27 1988-11-28 Procédé et dispositif pour séparer les impuretés lourdes des céréales

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP88119820A Expired - Lifetime EP0318054B1 (fr) 1987-11-27 1988-11-28 Procédé et dispositif pour séparer les impuretés lourdes des céréales

Country Status (13)

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EP (2) EP0318053B1 (fr)
JP (2) JP2525493B2 (fr)
KR (2) KR940006018B1 (fr)
CN (1) CN1014870B (fr)
AU (2) AU612759B2 (fr)
BR (2) BR8807330A (fr)
CZ (1) CZ280323B6 (fr)
DE (2) DE3887834D1 (fr)
ES (2) ES2033403T3 (fr)
HU (2) HU208501B (fr)
PL (1) PL161158B1 (fr)
SK (1) SK278526B6 (fr)
WO (2) WO1989004721A1 (fr)

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DE102004054275A1 (de) * 2004-11-09 2006-05-11 Bühler AG Vorrichtung zum Trennen von körnigem Gut
KR100719459B1 (ko) * 2005-11-18 2007-05-17 태성개발(주) 밀폐형 진동스크린을 이용한 이물질의 분리방법 및 그 장치
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KR101177824B1 (ko) * 2010-04-20 2012-08-29 김진수 진동 선별장치
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DE102013004417B4 (de) * 2013-03-15 2016-06-30 BEAR Mühlen & Behälter GmbH Verfahren und Anlage zur Sedimentation von Schwerteilen aus Kakaobohnen

Also Published As

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KR890701214A (ko) 1989-12-19
AU612759B2 (en) 1991-07-18
KR950011184B1 (en) 1995-09-29
BR8807330A (pt) 1990-03-01
AU2808289A (en) 1989-06-14
JPH02502352A (ja) 1990-08-02
JPH02502351A (ja) 1990-08-02
WO1989004722A1 (fr) 1989-06-01
EP0318053A1 (fr) 1989-05-31
HUT54534A (en) 1991-03-28
JP2530736B2 (ja) 1996-09-04
HUT61914A (en) 1993-03-29
HU204449B (en) 1992-01-28
WO1989004721A1 (fr) 1989-06-01
AU612451B2 (en) 1991-07-11
KR940006018B1 (ko) 1994-07-02
PL161158B1 (pl) 1993-05-31
KR890701213A (ko) 1989-12-19
DE3873035D1 (de) 1992-08-27
CZ778288A3 (en) 1995-09-13
EP0318054A1 (fr) 1989-05-31
AU2810489A (en) 1989-06-14
EP0318054B1 (fr) 1992-07-22
SK778288A3 (en) 1997-08-06
SK278526B6 (en) 1997-08-06
CN1014870B (zh) 1991-11-27
DE3887834D1 (de) 1994-03-24
HU893383D0 (en) 1992-02-28
CZ280323B6 (cs) 1995-12-13
HU208501B (en) 1993-11-29
JP2525493B2 (ja) 1996-08-21
PL276049A1 (en) 1989-08-07
ES2049741T3 (es) 1994-05-01
ES2033403T3 (es) 1993-03-16
CN1035963A (zh) 1989-10-04
BR8807331A (pt) 1990-03-01

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