EP0155556A2 - Air suction device for a sifting or sorting apparatus - Google Patents

Air suction device for a sifting or sorting apparatus Download PDF

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Publication number
EP0155556A2
EP0155556A2 EP85102170A EP85102170A EP0155556A2 EP 0155556 A2 EP0155556 A2 EP 0155556A2 EP 85102170 A EP85102170 A EP 85102170A EP 85102170 A EP85102170 A EP 85102170A EP 0155556 A2 EP0155556 A2 EP 0155556A2
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EP
European Patent Office
Prior art keywords
air
air distribution
distribution space
stand
suction channel
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
EP85102170A
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German (de)
French (fr)
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EP0155556B1 (en
EP0155556A3 (en
Inventor
Roman Mueller
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Buehler AG
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Buehler AG
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Priority to AT85102170T priority Critical patent/ATE56158T1/en
Publication of EP0155556A2 publication Critical patent/EP0155556A2/en
Publication of EP0155556A3 publication Critical patent/EP0155556A3/en
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    • 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
    • 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
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B4/00—Separating solids from solids by subjecting their mixture to gas currents
    • B07B4/08—Separating solids from solids by subjecting their mixture to gas currents while the mixtures are supported by sieves, screens, or like mechanical elements
    • 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
    • B07B2201/00—Details applicable to machines for screening using sieves or gratings
    • B07B2201/04—Multiple deck screening devices comprising one or more superimposed screens

Definitions

  • the invention relates to a device for extracting air for sighting or classifying devices with an air distribution space over the sieve layers and with a plurality of bulkhead-shaped air guiding chambers which reach close to the uppermost sieve layer, a throttle being assigned to each air guiding chamber.
  • Sighting and classifying devices are special machines that are used in large numbers in grain milling. It is used to separate grain and ground material into the desired fraction.
  • a work table forms the heart of the device, above which the material to be separated is conveyed by a vibration movement. Supported by an air velocity that is adapted to the fineness of the product, the goods are separated according to their weight as well as their size or a corresponding form factor.
  • a prerequisite for a high separation quality is, in particular, a quantity of air that can be controlled over the entire length of the machine, for which purpose an upwardly conically tapering air distribution space with a number of approximately 10 to 2 o air duct chambers is used.
  • a throttle element is assigned to each air guide chamber or bulkhead, with which the amount of air can be adjusted in accordance with the desired separation work.
  • the object of the invention is to eliminate these disadvantages as far as possible with good adjustability and simple construction.
  • this is achieved in a device of the type mentioned at the outset in that an extraction duct is placed on the air distribution space and the transition from the air distribution space into the extraction duct is tangential.
  • the tangential transition creates a cyclone flow in the suction channel, which has several advantages.
  • a strong vortex flow is formed in the suction channel regardless of the open position of the throttle elements, so that neither dust nor other particles can be deposited.
  • the invention thus not only ensures that the machine is kept clean, but also improves its operational safety. Once optimal positions for the chokes have been found, they can easily be used again at any time by repeating the same operation.
  • the throttles can be arranged in the transition area between the air distribution space and the suction duct, which not only results in a compact design, but also a favorable guidance of the air flow, since the transition area and the throttles form only a single common disturbance in the air flow .
  • the throttles are very particularly preferably designed as adjusting slides. It has been shown that in connection with the tang tial transition from the air distribution space in the suction channel adjustment slide allow a very precise and almost linear adjustment of the local air flow in a wide range, since the deflection angles for the air flow are changed only slightly.
  • the throttle elements can preferably be designed as adjusting flaps and, seen in the direction of flow of the air, can be arranged behind the air distribution space.
  • a further, very advantageous embodiment of the device according to the invention also consists in the suction channel being designed as a separate component and the air distribution space being placed as a lying cyclone (“backpack-like”).
  • backpack-like a lying cyclone
  • the suction channel has a constant cross section.
  • experiments have shown that, especially with difficult flour-like goods, that is to say for the corresponding semolina passages, virtually no undesired product deposits can be found.
  • the suction channel is at least partially rounded in cross section, preferably circular. It has also proven to be particularly favorable if the diameter of the cross section of the suction channel is approximately one third to one fourth the width of the sieve layers.
  • FIGS. I and 2 there in which a so-called “dual engine” is shown, which consists of two operatively completely separate semolina cleaning machine consists, as shown in Fig. 2. These two semolina cleaning machines are arranged on the left and right with respect to a central stand construction.
  • each individual collecting device 4 or 5 has two processes 6 or 7.
  • the sieve layers 3 are each combined to form a cleaning box 8 (FIG. 2 ), so that each cleaning box 8 is assigned two outlets 2 for the screen rejection and four outlets 6 and 7 for the screen diarrhea in accordance with the illustrated embodiment.
  • Each cleaning box 8 is supported by an end support 12 (FIG.
  • the collecting device 4 is designed as a vibrating conveyor trough, which rests on both end sides on a support 19 mounted in rubber (FIG. 1).
  • the oscillation drive of the collecting device 4 takes place via a lever 20 which connects the oscillating end support 1 2 to the support 19.
  • the swing stroke of the collecting device 4 can thus be selected or adjusted independently of the swing stroke of the cleaning box 8.
  • the stand 9 carries all non-vibrating components directly, with the vibrating elements being supported over the lower part of the stand.
  • the stand 9 furthermore has a vertical support 21 on both end sides (FIG. 2), which merges into a foot construction at the bottom via an extension. According to the Dar position of FIG.
  • the vertical support 21 extends a little beyond the uppermost sieve position and supports the stand head 11, which essentially forms the upper air distribution space 22 .
  • This upper air distribution space 22 is tapered upwards and is divided over its length by bulkheads 23 into sixteen separate air guide chambers 24 .
  • the bulkheads 23 are brought close to the uppermost sieve layer, the spacing being chosen such that it is somewhat larger than the greatest layer thickness "S" of the material which ever occurs (cf. FIG. 3 and Fig. 5 ).
  • the upper inclined surfaces of the air distribution space 22 have transparent windows 25 over their entire length (FIG. 2 ), so that the flow behavior of the material above the top sieve layer 3 can be controlled with an electrical light source from the outside of the device.
  • G in the F l. 3 and 4 can be seen between the upper end of the air distribution chamber 22 and an exhaust manifold 27 seated on the air distribution chamber 2 2 in the form of adjusting flaps 2 8, which can be adjusted individually via a head 29 according to the respective air requirement.
  • It is. 3 to 6 show, the transition area from the Lucasvertcilraum 22 to the suction channel 27 formed so that it opens tangentially into the suction channel 27.
  • the vibrator 14 When commissioning the semolina cleaning machine shown, the vibrator 14 is switched on, so that the cleaning box 8, the floor 32 and the Catchers 4 and 5 perform the preselected swinging movement in the longitudinal direction of the device. Likewise, the entire device is placed in a slight negative pressure via the suction collecting duct 27 or an aspiration associated therewith. Depending on the separation task, all slides and flaps are provisionally adjusted, after which the product can be fed into the inlet i. The product immediately falls on the top sieve layer 3 . Due to the shaking movement, which is imprinted on the material, as well as through the sieve layers which are deliberately inclined downwards from the inlet i to the outlet 2 and through the air flow through the sieve layers 3 , the product behaves like a liquid (fluidized).
  • the central task of the semolina cleaning machine lies in the actual sieving process. So the air flow must not be adjusted so much that the entire product layer could be lifted off the sieve layers. Rather, the air primarily serves the function of loosening up the product and distributing it evenly over the entire surface.
  • the product should be fractionated into coarse, medium and fine size or into cooking size and medium size etc.
  • the first six chutes can be directed into the collecting device 4 , the subsequent eleven chutes into the collecting device 5 .
  • the two sieve passes are finished products that can be delivered to the corresponding storage cells or to the consumers.
  • the screen rejects at the outlets are partially regrinded or crushed and then transferred to a second, appropriately set, semolina cleaning machine.
  • the miller's actual task begins, namely the assessment of the functioning of the device and the quantitative and qualitative assessment of the fractions obtained.
  • the light source 2 6 (Fig. 2) is turned on, so that the entire room is illuminated within the Heilverteilraumes.
  • the flow behavior of the product within the individual air guiding chambers 24 can be observed over the entire length of window 25 .
  • a congestion can also occur at individual points: here the local air volume must be increased accordingly. If the flow behavior of the product is flawless and if there are no parts in the mixed product (outlets) that belong to the sieve diarrhea, the quality of the sieve diarrhea is checked again and the chutes 34 are adjusted to the correct collecting devices 4 and 5, respectively.
  • two different processes 6 and 7 can be selected from each collecting device 4 or 5 , so that four different fractions can be separated from each cleaning box 8.
  • the cross section of the suction channel 27 increases in the direction of the air flow.
  • FIGS. 5 and 6 show, as an alternative to FIGS. 3 and 4 , a further advantageous embodiment.
  • sliders 40 are used in the solution of FIGS. 5 and 6.
  • This slide 4 o allow a more precise adjustment of the air requirement in all slide positions.
  • a proportional change in cross-section of the slide opening is caused in accordance with the revolutions of the head 29 . If a flap were used instead of a slider, a similar, proportional cross-sectional change would no longer occur here, since in such a case the effective opening cross-section would no longer change in proportion to the rotation of the head 29 .
  • the slide solution also has the further advantage that the free cross section of the suction collecting duct 27 is not influenced by the different open positions of the slide.
  • the suction collecting duct 27 can be designed with a constant cross section in the air flow direction.
  • the suction device according to the invention in particular also Separating devices that primarily work according to their weight, as can also be used in various versions of light grain readers and also in combined machines. Work processes are always carried out by the machines mentioned, in which larger work surfaces have to be divided into a plurality of small surface sections which can be controlled in terms of the air volume, although control of the air volume only has to be possible above the bed layer (generally on the suction side). This gives good controllability of the air volume for suction operation without the disadvantages that often occur in the prior art due to the heavy dusting of corresponding throttle channels.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Cleaning In General (AREA)
  • Peptides Or Proteins (AREA)
  • Manipulator (AREA)
  • Sorting Of Articles (AREA)
  • Pretreatment Of Seeds And Plants (AREA)
  • Detergent Compositions (AREA)

Abstract

In the case of an apparatus for cleaning grits, which has a plurality of superimposed screen layers, which can be vibrated by means of at least one unbalance exciter and with an inlet or outlet for the product inlet or screen discharge arranged at one end, collecting means with adjustable setting flaps for the screenings, as well as an air circulation through the screen layers over an air distribution chamber in a suction collecting channel adjustable by means of adjusting flaps, it is provided that the apparatus is constructed as a stand with a stand head, a stand base and a vertical intermediate support connecting said two parts, the screen layers being constructed as a dust box and being vibratably supported in the vicinity of the stand base, the stand top being formed by the upper air distribution chamber.

Description

Die Erfindung bezieht sich auf eine Vorrichtung zum Absaugen von Luft für Sicht- oder Klassiervorrichtungen mit einem Luftverteilraum über den Sieblagen sowie mit einer Mehrzahl schottenartig ausgebildeter Luftführungskammern, die bis nahe an die oberste Sieblage heranreichen, wobei jeder Luftführungskammer jeweils eine Drossel zugeordnet ist.The invention relates to a device for extracting air for sighting or classifying devices with an air distribution space over the sieve layers and with a plurality of bulkhead-shaped air guiding chambers which reach close to the uppermost sieve layer, a throttle being assigned to each air guiding chamber.

Sicht- und Klassiervorrichtungen sind Spezialmaschinen, die in großer Anzahl in der GetreidemUllerei verwendet werden. Es werden damit Korn wie auch Mahlguter in die jeweils gewünschte Fraktion getrennt.Sighting and classifying devices are special machines that are used in large numbers in grain milling. It is used to separate grain and ground material into the desired fraction.

In beiden Gattungen bildet ein Arbeitstisch das Herz der Vorrichtung, über dem das zu trennende Gut durch eine Vibrationsbewegung gefördert wird. Unterstützt durch eine an die Feinheit des Produktes angepaßte Luftgeschwindigkeit findet eine Trennung des Gutes sowohl nach der Schwere wie auch nach der Größe bzw. nach einem entsprechenden Formfaktor statt. Voraussetzung für eine hohe Trennqualität ist insbesondere eine über die ganze Maschinenlänge kontrollierbare Luftmenge, wozu ein nach oben konisch sich verjüngender Luftverteilraum mit einer Anzahl von etwa 10 bis 2o schottenartig ausgebildeter Luftführungskammern eingesetzt wird. Jeder Luftführungskammer bzw. Schotte wird ein Drosselelement zugeordnet, womit die Luftmenge entsprechend der jeweils gewünschten Trennarbeit einstellbar ist. Vom Luftverteilraum wurde die Luft bisher bei bekannten Maschinen an einer Stelle zentral aspiriert. Der Nachteil der bekannten Lösungen liegt darin, daß im Betrieb in Strömungsrichtung hinter den Drosseln sich, je nach Stellung der Drosseln, Staub und Gutpartikel abzulagern beginnen und im Extremfall bei ungenügender Reinigung eine oder mehrere Drosselöffnungen verstopfen können. Dabei sind einmal gefundene Optimalstellungen aller Schieber bzw. Drosseln nur so lange wirksam, wie in der Maschine (Absaugkanal) keine wesentlichen Produktablagerungen auftreten.In both types, a work table forms the heart of the device, above which the material to be separated is conveyed by a vibration movement. Supported by an air velocity that is adapted to the fineness of the product, the goods are separated according to their weight as well as their size or a corresponding form factor. A prerequisite for a high separation quality is, in particular, a quantity of air that can be controlled over the entire length of the machine, for which purpose an upwardly conically tapering air distribution space with a number of approximately 10 to 2 o air duct chambers is used. A throttle element is assigned to each air guide chamber or bulkhead, with which the amount of air can be adjusted in accordance with the desired separation work. Up to now, the air has been centrally aspirated at one point in known machines from the air distribution room. The disadvantage of the known solutions is that in Operation in the direction of flow behind the throttles, depending on the position of the throttles, dust and good particles begin to accumulate and, in extreme cases, can clog one or more throttle openings if cleaning is insufficient. Once optimal positions of all slides or throttles have been found, they are only effective as long as no significant product deposits occur in the machine (suction channel).

Ausgehend hiervon liegt der Erfindung die Aufgabe zugrunde, bei guter Einstellbarkeit und einfachem Aufbau diese Nachteile möglichst weitgehend zu beheben.Proceeding from this, the object of the invention is to eliminate these disadvantages as far as possible with good adjustability and simple construction.

Erfindungsgemäß wird dies bei einer Vorrichtung der eingangs genannten Art dadurch erreicht, daß ein Absaugkanal dem Luftverteilraum aufgesetzt und der Übergang vom Luftverteilraum in den Absaugkanal tangential ausgebildet ist. Mit der vorgeschlagenen Lösung konnte die Aufgabe überraschend gut gelöst werden. Durch den tangentialen Übergang entsteht im Absaugkanal eine Zyklonströmung, die mehrere Vorteile mit sich bringt. So bildet sich im Absaugkanal zum einen unabhängig von der Öffnungsstellung der Drosselelemente eine starke Wirbelströmung aus, so daß sich weder Staub noch sonstige Partikel ablagern können. Darüber hinaus zeigte sich, daß auch das vollständige Schließen einzelner Drosselelemente weder die Wirbelbildung noch die selbsttätige Reinhaltung des Absaugkanales beeinflußte. Damit sichert die Erfindung nicht nur eine Reinhaltung der Maschine, sondern verbessert auch deren Betriebssicherheit. Sind Optimalstellungen für die Drosseln einmal aufgefunden, so können sie bei Wiederholung des gleichen Arbeitsvorganges jederzeit wieder unschwer erfolgreich verwendet werden.According to the invention, this is achieved in a device of the type mentioned at the outset in that an extraction duct is placed on the air distribution space and the transition from the air distribution space into the extraction duct is tangential. With the proposed solution, the task could be solved surprisingly well. The tangential transition creates a cyclone flow in the suction channel, which has several advantages. A strong vortex flow is formed in the suction channel regardless of the open position of the throttle elements, so that neither dust nor other particles can be deposited. In addition, it was found that even the complete closing of individual throttle elements did not affect the vortex formation or the automatic cleaning of the suction channel. The invention thus not only ensures that the machine is kept clean, but also improves its operational safety. Once optimal positions for the chokes have been found, they can easily be used again at any time by repeating the same operation.

In vorteilhafter Ausgestaltung der erfindungsgemäßen Vorrichtung können die Drosseln im Übergangsbereich zwischen Luftverteilraum und Absaugkanal angeordnet werden, wodurch sich nicht nur eine kompakte Bauweise, sondern auch eine günstige Führung der Luftströmung ergibt, da der Übergangsbereich und die Drosseln nur eine einzige gemeinsame Störung in der Luftströmung ausbilden.In an advantageous embodiment of the device according to the invention, the throttles can be arranged in the transition area between the air distribution space and the suction duct, which not only results in a compact design, but also a favorable guidance of the air flow, since the transition area and the throttles form only a single common disturbance in the air flow .

Ganz besonders bevorzugt werden die Drosseln als Einstellschieber ausgebildet. Es hat sich gezeigt, daß im Zusammenhang mit dem tangentialen Übergang vom Luftverteilraum in den Absaugkanal Einstellschieber eine sehr genaue und in einem großen Bereich nahezu lineare Verstellung des örtlichen Luftdurchsatzes ermöglichen, da die Umlenkwinkel für die Luftströmung nur geringfügig geändert werden. Bei Vorrichtungen mit weniger großen Anforderungen an die Einstellgenauigkeit der Luftmenge können die Drosselelemente vorzugsweise als Verstellklappen ausgebildet und, in Strömungsrichtung der Luft gesehen, hinter dem Luftverteilraum angeordnet werden.The throttles are very particularly preferably designed as adjusting slides. It has been shown that in connection with the tang tial transition from the air distribution space in the suction channel adjustment slide allow a very precise and almost linear adjustment of the local air flow in a wide range, since the deflection angles for the air flow are changed only slightly. In devices with less stringent requirements for the setting accuracy of the air quantity, the throttle elements can preferably be designed as adjusting flaps and, seen in the direction of flow of the air, can be arranged behind the air distribution space.

Eine weitere, sehr vorteilhafte Ausgestaltung der erfindungsgemäßen Vorrichtung besteht auch darin, daß der Absaugkanal als getrenntes Bauteil ausgebildet und dem Luftverteilraum als liegender Zyklon ("rucksackartig") aufgesetzt ist. Dies erlaubt es einerseits. bei der Gesamtvorrichtung an Bauhöhe einzusparen, gleichzeitig aber auch eine günstige Herstellung, ganz besonders wenn der Absaugkanal einen konstanten Querschnitt aufweist. Bezüglich dieses konstanten Querschnittes konnte in Versuchen gezeigt werden, daß gerade bei schwierigen mehlartigen Gütern, also für die entsprechenden Grießpassagen, so gut wie keine unerwünschten Produktablagerungen mehr festzustellen sind. Sehr vorteilhaft ist es ferner, wenn der Absaugkanal im Querschnitt wenigstens teilweise gerundet, vorzugsweise kreisförmig ausgebildet ist. Als besonders günstig hat es sich weiterhin gezeigt, wenn der Durchmesser des Querschnitts des Absaugkanales etwa ein Drittel bis ein Viertel der Breite der Sieblagen beträgt.A further, very advantageous embodiment of the device according to the invention also consists in the suction channel being designed as a separate component and the air distribution space being placed as a lying cyclone (“backpack-like”). On the one hand, this allows. to save on the overall device in terms of overall height, but at the same time also an inexpensive production, especially if the suction channel has a constant cross section. With regard to this constant cross-section, experiments have shown that, especially with difficult flour-like goods, that is to say for the corresponding semolina passages, virtually no undesired product deposits can be found. It is also very advantageous if the suction channel is at least partially rounded in cross section, preferably circular. It has also proven to be particularly favorable if the diameter of the cross section of the suction channel is approximately one third to one fourth the width of the sieve layers.

Die Erfindung wird nachfolgend anhand der Zeichnung im Prinzip beispielshalber noch näher erläutert. Es zeigen:

  • Fig. i eine Längsansicht einre Grießputzmaschine mit einer erfindungsgemäßen Absaugvorrichtung;
  • Fig. 2 den Schnitt 11-11 aus Fig. i;
  • Fig. 3 eine schematische Darstellung des oberen Luftverteilraumes mit -Absaugkanal und Klappenverstellung bei einer erfindungsgemäßen Vorrichtung;
  • Fig. 4 eine Schnittdarstellung längs IV-IV in Fig. 3;
  • Fig. 5 eine zur Darstellung nach Fig. 3 geänderte weitere Ausführungsform einer erfindungsgemäßen Vorrichtung mit Schieberverstellung, sowie
  • Fig. 6 eine Detail-Draufsicht auf die in Fig. 5 dargestellte Vorrichtung.
The invention is explained in more detail below in principle by way of example with reference to the drawing. Show it:
  • Fig. I is a longitudinal view of a semolina cleaning machine with a suction device according to the invention;
  • FIG. 2 shows the section 11-11 from FIG. I;
  • Fig. 3 is a schematic representation of the upper air distribution space with suction channel and flap adjustment in a device according to the invention;
  • Fig. 4 is a sectional view along IV-IV in Fig. 3;
  • 5 shows a further embodiment of a device according to the invention with slide adjustment modified as shown in FIG. 3, and
  • Fig. 6 is a detailed top view of the device shown in Fig. 5.

Zunächst sei auf die Fig. i und 2 Bezug genommen, in denen eine sogenannte "Doppelmaschine" dargestellt ist, die aus zwei arbeitstechnisch vollständig getrennten Grießputzmaschinen besteht, wie dies in Fig. 2 gezeigt ist. Diese beiden Grießputzmaschinen sind links und rechts bezüglich einer mittleren Ständerkonstruktion getrennt angeordnet.Referring initially to FIGS. I and 2, there in which a so-called "dual engine" is shown, which consists of two operatively completely separate semolina cleaning machine consists, as shown in Fig. 2. These two semolina cleaning machines are arranged on the left and right with respect to a central stand construction.

In Fig. i erkennt man links oben einen Einlauf i für das der Vorrichtung zuzuführende Produkt und rechts unten Ausläufe 2 für den Siebabstoß. Des weiteren sind drei übereinander angeordnete Sieblagen 3 vorgesehen, wobei unter diesen eine innere Auffangvorrichtung 4 sowie eine äußere Auffangvorrichtung 5 angeordnet sind (Fig. 2), in denen der Siebdurchfall gesammelt wird. Dabei weist in der Regel jede einzelne Auffangvorrichtung 4 bzw. 5 zwei Abläufe 6 bzw. 7 auf. Die Sieblagen 3 sind je zu einem Putzkasten 8 vereinigt (Fig. 2), so daß jedem Putzkasten 8 entsprechend der dargestellten Ausführungsform zwei Ausläufe 2 für den Siebabstoß sowie vier Abläufe 6 und 7 für den Siebdurchfall zugeordnet sind. Jeder Putzkasten 8 ist über eine Endstütze 12 (Fig. i) über Schwingelemente bzw. Gummihohlfedern 13 an einem Ständerfuß 10 eines Ständers 9 schwingfähig abgestützt. Mit der Endstütze 12 ist ein Unwuchterreger 14 fest verbunden, dessen Stoßrichtung (vgl. Pfeil 15 in Fig. i) durch eine Verdrehung des Unmwuchterregers 14 an einer rohrförmigen Querverbindung 16 einstellbar ist. Ebenso läßt sich, was bekannt ist, die Stärke der Unwuchtkräfte durch entsprechende Einstellung der Unwuchtgewichte 17 regulieren. An der Querverbindung 16 sind zwei Unwuchterreger 14 befestigt und elektrisch so angeschlossen, daß sie gegenläufig drehen. Damit heben sich ihre seitlichen Unwuchtkomponeten auf und es entsteht eine rein lineare Längsschwingung in Richtung des Pfeiles 15. Über den Unwuchterregern 14 ist eine Abdeckung 18 angebracht, die zur baulichen Vereinfachung als Teil des schwingenden Systems ausgebildet ist.In Fig. I one can see on the top left an inlet i for the product to be fed to the device and on the bottom right outlet 2 for the screen rejection. Furthermore, three screen layers 3 arranged one above the other are provided, an inner collecting device 4 and an outer collecting device 5 being arranged beneath them (FIG. 2 ), in which the sieve diarrhea is collected. As a rule, each individual collecting device 4 or 5 has two processes 6 or 7. The sieve layers 3 are each combined to form a cleaning box 8 (FIG. 2 ), so that each cleaning box 8 is assigned two outlets 2 for the screen rejection and four outlets 6 and 7 for the screen diarrhea in accordance with the illustrated embodiment. Each cleaning box 8 is supported by an end support 12 (FIG. I) via oscillating elements or hollow rubber springs 13 on a stand base 10 of a stand 9 so that it can vibrate. An unbalance exciter 14 is fixedly connected to the end support 12 , the direction of impact (cf. arrow 15 in FIG. I) can be adjusted by rotating the unbalance exciter 14 on a tubular cross-connection 16. Likewise, what is known can regulate the strength of the unbalance forces by appropriate adjustment of the unbalance weights 17 . At the cross connection 1 6 two unbalance exciters 14 are attached and electrically connected so that they rotate in opposite directions. This eliminates their lateral unbalance components and creates a purely linear longitudinal vibration in the direction of arrow 15 . A cover 1 8 is attached above the unbalance exciters 14 and is designed as part of the vibrating system for structural simplification.

Die Auffangvorrichtung 4 ist als Schwingförderrinne ausgebildet, die auf beiden Endseiten auf je einer in Gummi gelagerten Stütze 19 ruht (Fig. 1). Der Schwingantrieb der Auffangvorrichtung 4 erfolgt über einen Hebel 20, der die schwingende Endstütze 12 mit der Stütze 19 verbindet. Je nach der Höhenlage des Angriffspunktes des Hebels 2o an der Stütze 19 (diese Höhenlage ist einstellbar) kann somit der Schwinghub der Auffangvorrichtung 4 unabhängig vom Schwinghub des Putzkastens 8 gewählt bzw. eingestellt werden. Der Ständer 9 trägt direkt alle nicht-schwingenden Bauteile, wobei über dem Ständerunterteil die schwingenden Elemente gelagert smd. Der Ständer 9 weist weiterhin auf beiden Endseiten ie eine vertikale Stütze 21 auf (Fig.2), die unten über eine Erweiterung in eine Fußkonstruktion übergeht. Gemäß der Dar stellung der Fig. 2 reicht die vertikale Stütze 21 ein wenig über die oberste Sieblage hinaus und trägt den Ständerkopf 11. der im wesentlichen den oberen Luftverteilraum 22 ausbildet. Dieser obere Luftverteilraum 22 weist eine nach oben verjüngte Form auf und ist über seine Länge durch Schotten 23 in sechzehn getrennte LuftfUhrungskammern 24 aufgeteilt. Die Schotten 23 sind, wie aus Fig. I ersichtlich, bis nahe an die oberste Sieblage geführt, wobei der Abstand so gewählt ist, daß er etwas größer ist als die größte jemals sich einstellende Schichtdicke "S" des Gutes (vgl. Fig. 3 und Fig. 5).The collecting device 4 is designed as a vibrating conveyor trough, which rests on both end sides on a support 19 mounted in rubber (FIG. 1). The oscillation drive of the collecting device 4 takes place via a lever 20 which connects the oscillating end support 1 2 to the support 19. Depending on the height of the point of application of the lever 2 o on the support 19 (this height can be adjusted), the swing stroke of the collecting device 4 can thus be selected or adjusted independently of the swing stroke of the cleaning box 8. The stand 9 carries all non-vibrating components directly, with the vibrating elements being supported over the lower part of the stand. The stand 9 furthermore has a vertical support 21 on both end sides (FIG. 2), which merges into a foot construction at the bottom via an extension. According to the Dar position of FIG. 2, the vertical support 21 extends a little beyond the uppermost sieve position and supports the stand head 11, which essentially forms the upper air distribution space 22 . This upper air distribution space 22 is tapered upwards and is divided over its length by bulkheads 23 into sixteen separate air guide chambers 24 . The bulkheads 23 , as can be seen from FIG. I, are brought close to the uppermost sieve layer, the spacing being chosen such that it is somewhat larger than the greatest layer thickness "S" of the material which ever occurs (cf. FIG. 3 and Fig. 5 ).

Die oberen Schrägflächen des Luftverteilraumes 22 weisen über ihre ganze Länge durchsichtige Fenster 25 (Fig. 2) auf, so daß mit einer elektrischen Lichtquelle von der Außenseite der Vorrichtung her das Fließverhalten des Gutes über der obersten Sieblage 3 kontrolliert werden kann. In den Flg. 3 und 4 erkennt man zwischen dem oberen Ende des Luftverteilraumes 22 und einem auf dem Luftverteilraum 22 sitzenden Absaugsammelkanal 27 Drosseln in Form von Verstellklappen 28, die einzeln über einen Kopf 29 dem jeweihgen Luftbedarf entsprechend eingestellt werden können. Dabei ist. wie die Fig. 3 bis 6 zeigen, der Übergangsbereich vom Luftvertcilraum 22 zum Absaugkanal 27 so ausgebildet, daß er tangential in den Absaugkanal 27 einmündet.The upper inclined surfaces of the air distribution space 22 have transparent windows 25 over their entire length (FIG. 2 ), so that the flow behavior of the material above the top sieve layer 3 can be controlled with an electrical light source from the outside of the device. G in the F l. 3 and 4 can be seen between the upper end of the air distribution chamber 22 and an exhaust manifold 27 seated on the air distribution chamber 2 2 in the form of adjusting flaps 2 8, which can be adjusted individually via a head 29 according to the respective air requirement. It is. 3 to 6 show, the transition area from the Luftvertcilraum 22 to the suction channel 27 formed so that it opens tangentially into the suction channel 27.

Bei der Inbetriebnahme der gezeigten Grießputzmaschine wird der Vibrator 14 eingeschaltet, so daß der Putzkasten 8, der Boden 32 und die Auffangvorrichtungen 4 und 5 die vorgewählte Schwingbewegung in Längsrichtung der Vorrichtung durchführen. Ebenso wird die ganze Vorrichtung über den Absaugsammelkanal 27 bzw. eine damit verbunden Aspiration in geringen Unterdruck versetzt. Je nach Trennaufgabe werden alle Schieber und Klappen provisorisch eingestellt, wonach das Produkt in den Einlauf i eingespeist werden kann. Das Produkt fällt sofort auf die oberste Sieblage 3. Durch die Schüttelbewegung, die dem Gut aufgeprägt wird, sowie durch die bewußt vom Einlauf i zum Auslauf 2 schräg nach unten geneigten Sieblagen und durch die Luftströmung durch die Sieblagen 3 verhält sich das Produkt flüssigkeitsähnlich (fluidisiert). Die zentrale Aufgabe der Grießputzmschine liegt im eigentlichen Siebvorgang. Also darf die Luftströmung nicht so stark eingestellt werden, daß die ganze Produktschicht von den Sieblagen abgehoben werden könnte. Vielmehr dient die Luft in erster Linie der Funktion, das Produkt aufzulockern und gleichmäßig über die ganze Fläche zu verteilen.When commissioning the semolina cleaning machine shown, the vibrator 14 is switched on, so that the cleaning box 8, the floor 32 and the Catchers 4 and 5 perform the preselected swinging movement in the longitudinal direction of the device. Likewise, the entire device is placed in a slight negative pressure via the suction collecting duct 27 or an aspiration associated therewith. Depending on the separation task, all slides and flaps are provisionally adjusted, after which the product can be fed into the inlet i. The product immediately falls on the top sieve layer 3 . Due to the shaking movement, which is imprinted on the material, as well as through the sieve layers which are deliberately inclined downwards from the inlet i to the outlet 2 and through the air flow through the sieve layers 3 , the product behaves like a liquid (fluidized). The central task of the semolina cleaning machine lies in the actual sieving process. So the air flow must not be adjusted so much that the entire product layer could be lifted off the sieve layers. Rather, the air primarily serves the function of loosening up the product and distributing it evenly over the entire surface.

Je nach Aufgabenstellung wird gefordert, daß das Produkt in grobe, mittlere und feine Grieße oder in Kochgrieße und mittlere Grieße usw. fraktioniert werden soll. Im zweiten Fall z. B. können die ersten sechs Schurren in die Auffangvorrichtung 4, die nachfolgenden elf Schurren in die Auffangvorrichtung 5 gerichtet werden. In diesem Fall handelt es sich bei den beiden Siebdurchgängen um Fertigprodukte, die zu den entsprechenden Lagerzellen bzw. zu den Verbrauchern abgegeben werden können. Die Siebabstöße bei den Ausläufen werden teilweise einer nochmaligen Vermahlung oder Zerkleinerung zugeführt und gelangen dann auf eine zweite entsprechend eingestellten Grießputzmaschine.Depending on the task, it is required that the product should be fractionated into coarse, medium and fine size or into cooking size and medium size etc. In the second case, e.g. B. the first six chutes can be directed into the collecting device 4 , the subsequent eleven chutes into the collecting device 5 . In this case, the two sieve passes are finished products that can be delivered to the corresponding storage cells or to the consumers. The screen rejects at the outlets are partially regrinded or crushed and then transferred to a second, appropriately set, semolina cleaning machine.

In jeder Grießputzmaschine müssen die spezifischen, für die jeweilige Aufgabe geeigneten Siebmaschenweiten gewählt werden.The specific sieve mesh sizes suitable for the respective task must be selected in each semolina cleaning machine.

Ist die Grießputzmaschine einmal in vollem Betrieb, so beginnt die eigentliche Aufgabe des Müllers, nämlich die Beurteilung der Arbeitsweise der Vorrichtung sowie die mengenmäßige und qualitative Beurteilung der gewonnenen Fraktionen.Once the semolina cleaning machine is in full operation, the miller's actual task begins, namely the assessment of the functioning of the device and the quantitative and qualitative assessment of the fractions obtained.

Hierzu wird die Lichtquelle 26 (Fig. 2) eingeschaltet, so daß der ganze Raum innerhalb des Luftverteilraumes ausgeleuchtet wird. Durch die Fenster 25 kann über die ganze Länge das Fließverhalten des Produktes innerhalb der einzelnen Luftführungskammern 24 beobachtet werden. Zeigt sich innerhalb einer oder mehrerer LuftfUhrungskammern 24 ein Bild ähnlich dem kochenden Wassers, so wird die Luftmenge in den betreffenden LuftfUhrungskammern 24 über die Verstellklappen 28 gedrosselt. Umgekehrt kann aber auch an einzelnen Stellen ein Stau entstehen: hier muß dann die örtliche Luftmenge sinngemäß erhöht werden. Ist das Fließverhalten des Produktes einwandfrei und sind im Mischprodukt (Ausläufe) keine Anteile vorhanden, die zum Siebdurchfall gehören, so wird die Qualität der Siebdurchfälle nochmals überprüft und die Einstellung der Schurren 34 auf die jeweils richtigen Auffangvorrichtungen 4 bzw. 5 vorgenommen.For this purpose, the light source 2 6 (Fig. 2) is turned on, so that the entire room is illuminated within the Luftverteilraumes. Through the The flow behavior of the product within the individual air guiding chambers 24 can be observed over the entire length of window 25 . Is shown within one or more LuftfUhrungskammern 24, an image similar to the boiling water, so the amount of air is throttled in the relevant LuftfUhrungskammern 24 via the Verstellklappen 2. 8 Conversely, a congestion can also occur at individual points: here the local air volume must be increased accordingly. If the flow behavior of the product is flawless and if there are no parts in the mixed product (outlets) that belong to the sieve diarrhea, the quality of the sieve diarrhea is checked again and the chutes 34 are adjusted to the correct collecting devices 4 and 5, respectively.

Wie aus Fig. i ersichtlich ist, können von jeder Auffangvorrichtung 4 bzw. 5 je zwei verschiedene Abläufe 6 bzw. 7 gewählt werden, so daß von jedem Putzkasten 8 vier verschiedene Fraktionen separiert werden können. Dabei nimmt der Querschnitt des Absaugkanales 27 in Richtung der Luftströmung zu.As can be seen from FIG. 1, two different processes 6 and 7 can be selected from each collecting device 4 or 5 , so that four different fractions can be separated from each cleaning box 8. The cross section of the suction channel 27 increases in the direction of the air flow.

Die Fig. 5 und 6 zeigen, alternativ zu den Fig. 3 und 4, eine weitere vorteilhafte AusfUhrungsform. Anstelle der dort verwendeten Verstellklappen 28 sind bei der Lösung der Fig. 5 und 6 Schieber 40 eingesetzt. Diese Schieber 4o erlauben eine genauere Einstellung des Luftbedarfes in allen Schieberstellungen. Entsprechend den Umdrehungen des Kopfes 29 wird eine proportionale Querschnittsveränderung der Schieberöffnung verursacht. Wäre statt eines Schiebers eine Klappe eingesetzt, würde hier bei einer Verstellung demgegenüber keine ähnliche, proportionale Querschnittsveränderung mehr eintreten, da sich in einem solchen Fall der wirksame Öffnungsquerschnitt nicht mehr proportional zur Umdrehung des Kopfes 29 ändern würde. Die Schieberlösung hat zudem den weiteren Vorteil, daß der freie Querschnitt des Absaugsammelkanales 27 durch die verschiedenen Öffnungsstellungen der Schieber nicht beeinflußt wird.5 and 6 show, as an alternative to FIGS. 3 and 4 , a further advantageous embodiment. Instead of the adjustment flaps 2 8 used there, sliders 40 are used in the solution of FIGS. 5 and 6. This slide 4 o allow a more precise adjustment of the air requirement in all slide positions. A proportional change in cross-section of the slide opening is caused in accordance with the revolutions of the head 29 . If a flap were used instead of a slider, a similar, proportional cross-sectional change would no longer occur here, since in such a case the effective opening cross-section would no longer change in proportion to the rotation of the head 29 . The slide solution also has the further advantage that the free cross section of the suction collecting duct 27 is not influenced by the different open positions of the slide.

Besonders bei der Lösung gemäß den Fig. 5 und 6 hat es sich gezeigt, daß der Absaugsammelkanal 27 in Luftströmungsrichtung mit konstantem Querschnitt ausgeführt sein kann. Entsprechende Praxisversuche haben gezeigt, daß die erfindungsgemäße Absaugvorrichtung insbesondere auch bei Trennvorrichtungen, die primär nach der Schwere arbeiten, wie auch bei verschiedenen Ausführungen von Leichtkornauslesern und auch bei kombinierten Maschinen verwendet werden kann. Von den genannten Maschinen werden stets Arbeitsprozesse ausgeführt, bei denen größere Arbeitsflächen in eine Mehrzahl kleiner, in der Luftmenge kontrollierbare Flächenabschnitte eingeteilt werden müssen, wobei jedoch eine Steuerung der Luftmenge nur oberhalb der Schüttschicht (in aller Regel auf der Saugseite) möglich sein muß. Damit erhält man eine gute Steuerbarkeit der Luftmenge für den Saugbetrieb ohne die Nachteile, die bei Stande der Technik gerade durch starke Verstaubung entsprechender Drosselkanäle oft eintreten.5 and 6, in particular, it has been shown that the suction collecting duct 27 can be designed with a constant cross section in the air flow direction. Corresponding practical tests have shown that the suction device according to the invention in particular also Separating devices that primarily work according to their weight, as can also be used in various versions of light grain readers and also in combined machines. Work processes are always carried out by the machines mentioned, in which larger work surfaces have to be divided into a plurality of small surface sections which can be controlled in terms of the air volume, although control of the air volume only has to be possible above the bed layer (generally on the suction side). This gives good controllability of the air volume for suction operation without the disadvantages that often occur in the prior art due to the heavy dusting of corresponding throttle channels.

Claims (7)

1. Vorrichtung zum Absaugen von Luft für Sicht- oder Klassiervorrichtungen mit einem Luftverteilraum (22) über den Sieblagen (3), die eine Mehrzahl schottenartig ausgebildeter Luftführungskammern (24) aufweist, die bis nahe an die oberste Sieblage (3) heranreichen, wobei jeder Luftführungskammer (24) jeweils eine Drossel (28) zugeordnet ist, dadurch gekennzeichnet, daß ein Absaugkanal (27) dem Luftverteilraum (22) aufgesetzt und der Übergang vom Luftverteilraum (22) in den Absaugkanal (27) tangential ausgebildet ist. 1st Device for extracting air for classifying or classifying devices with an air distribution space ( 22 ) above the sieve layers ( 3 ), which has a plurality of bulkhead-shaped air guiding chambers ( 24 ) that come close to the top sieve layer ( 3 ), each air guiding chamber ( 24 ) a throttle ( 2 8) is assigned, characterized in that a suction duct ( 27 ) is placed on the air distribution space ( 22 ) and the transition from the air distribution space ( 22 ) into the suction duct ( 27 ) is tangential. 2. Vorrichtung nach Anspruch i, dadurch gekennzeichnet, daß die Drosseln (28) im Übergangsbereich zwischen dem Luftverteilraum (22) und dem Absaugkanal (27) angeordnet sind. 2nd Device according to claim i, characterized in that the throttles ( 2 8) are arranged in the transition region between the air distribution space ( 22 ) and the suction channel ( 27 ). 3. Vorrichtung nach Anspruch i oder 2, dadurch gekennzeichnet, daß die Drosseln in Form von Einstellschiebern (40) ausgebildet sind. 3rd Device according to claim i or 2 , characterized in that the throttles are designed in the form of adjusting slides ( 40 ). 4. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Drosseln als Verstellklappen (28) ausgebildet und, in Strömungsrichtung der Luft gesehen, hinter dem Luftverteilraum (22) angeordnet sind. 4th Apparatus according to claim 1 or 2 , characterized in that the throttles are designed as adjusting flaps ( 2 8) and, viewed in the direction of flow of the air, are arranged behind the air distribution space ( 22 ). 5. Vorrichtung nach einem der Ansprüche i bis 4, dadurch gekennzeichnet, daß der Absaugkanal (27) als getrenntes Bauteil ausgebildet und dem Luftverteilraum (22) als liegender Zyklon aufgesetzt ist.5. Device according to one of claims i to 4 , characterized in that the suction channel (2 7 ) is formed as a separate component and the Air distribution space ( 22 ) is placed as a horizontal cyclone. 6. Vorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der Absaugkanal (27) einen konstanten Querschnitt aufweist.6. Device according to one of claims 1 to 5, characterized in that the suction channel ( 27 ) has a constant cross section. 7. Vorrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß der Absaugkanal (27) einen runden, vorzugsweise kreisförmi- gen Querschnitt aufweist. 7 . Device according to one of claims 1 to 6, characterized in that the suction channel ( 27 ) has a round, preferably circular cross section.
EP85102170A 1984-03-22 1985-02-27 Air suction device for a sifting or sorting apparatus Expired - Lifetime EP0155556B1 (en)

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AT85102170T ATE56158T1 (en) 1984-03-22 1985-02-27 DEVICE FOR SUCTIONING AIR FROM CLASSIFIERS OR CLASSIFIERS.

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DE3410573A DE3410573C2 (en) 1984-03-22 1984-03-22 Device for cleaning semolina
DE3410573 1984-03-22

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EP0155556A3 EP0155556A3 (en) 1987-06-24
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EP85101898A Expired EP0155527B1 (en) 1984-03-22 1985-02-21 Device for cleaning semolina
EP85101992A Expired EP0155537B1 (en) 1984-03-22 1985-02-22 Device for cleaning semolina
EP85102170A Expired - Lifetime EP0155556B1 (en) 1984-03-22 1985-02-27 Air suction device for a sifting or sorting apparatus

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EP85101992A Expired EP0155537B1 (en) 1984-03-22 1985-02-22 Device for cleaning semolina

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Cited By (13)

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Publication number Priority date Publication date Assignee Title
EP0155537A2 (en) * 1984-03-22 1985-09-25 Bühler AG Device for cleaning semolina
EP0155537B1 (en) * 1984-03-22 1987-05-06 Bühler AG Device for cleaning semolina
WO2009021341A1 (en) * 2007-08-10 2009-02-19 Bühler AG Screening device for control screening
CN106269516A (en) * 2016-08-27 2017-01-04 卢明杰 A kind of raw material of industry production rapid filtering device
CN106269516B (en) * 2016-08-27 2018-07-27 日照广信化工科技有限公司 A kind of raw material of industry production rapid filtering device
WO2020038947A1 (en) * 2018-08-20 2020-02-27 Bühler AG Bulk material cleaner with integrated air separator, and bulk material cleaner with a hollow support frame
EP3613515A1 (en) * 2018-08-20 2020-02-26 Bühler AG Bulk material cleaning device with integrated air separator and bulk material cleaning device with a hollow support frame
EP3785813A1 (en) * 2018-08-20 2021-03-03 Bühler AG Bulk material cleaning device with integrated air separator and bulk material cleaning device with a hollow support frame
CN112654437A (en) * 2018-08-20 2021-04-13 布勒股份公司 Bulk material cleaning device with integrated air separator and bulk material cleaning device with hollow supporting frame
RU2764691C1 (en) * 2018-08-20 2022-01-19 Бюлер Аг Device for cleaning bulk materials with a built-in air separator, as well as a device for cleaning bulk materials with a hollow carrier frame
US11590538B2 (en) 2018-08-20 2023-02-28 Bühler AG Bulk material cleaner with integrated air separator, and bulk material cleaner with a hollow support frame
CN111921843A (en) * 2020-08-06 2020-11-13 浙江通惠矿山机械有限公司 High-frequency vibrating screen
CN112024386A (en) * 2020-09-22 2020-12-04 何平 Rice preparation screening and selecting processing method

Also Published As

Publication number Publication date
KR850006866A (en) 1985-10-21
EP0155537B1 (en) 1987-05-06
ES541472A0 (en) 1986-05-16
ATE36817T1 (en) 1988-09-15
DE3564659D1 (en) 1988-10-06
DE3410573C2 (en) 1986-03-13
ES8606797A1 (en) 1986-05-16
EP0155537A3 (en) 1986-02-05
EP0155537A2 (en) 1985-09-25
EP0155527A3 (en) 1986-02-05
DE3410573A1 (en) 1985-10-03
JPH0122827B2 (en) 1989-04-27
US4806235A (en) 1989-02-21
JPS60255181A (en) 1985-12-16
JPS60216872A (en) 1985-10-30
US4636305A (en) 1987-01-13
EP0155527A2 (en) 1985-09-25
EP0155527B1 (en) 1988-08-31
ATE56158T1 (en) 1990-09-15
SU1477238A3 (en) 1989-04-30
EP0155556B1 (en) 1990-09-05
KR890004600B1 (en) 1989-11-20
DE3560153D1 (en) 1987-06-11
JPH0113917B2 (en) 1989-03-08
ATE26932T1 (en) 1987-05-15
JPS60220175A (en) 1985-11-02
DE3579482D1 (en) 1990-10-11
JPH0113916B2 (en) 1989-03-08
EP0155556A3 (en) 1987-06-24

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