EP0218882B1 - Device for sorting metallic particles - Google Patents

Device for sorting metallic particles Download PDF

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Publication number
EP0218882B1
EP0218882B1 EP86112134A EP86112134A EP0218882B1 EP 0218882 B1 EP0218882 B1 EP 0218882B1 EP 86112134 A EP86112134 A EP 86112134A EP 86112134 A EP86112134 A EP 86112134A EP 0218882 B1 EP0218882 B1 EP 0218882B1
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EP
European Patent Office
Prior art keywords
socket
conveyor
conveyed
ejector
metal detector
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
Application number
EP86112134A
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German (de)
French (fr)
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EP0218882A2 (en
EP0218882A3 (en
Inventor
Guntram Kind
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.)
Pulsotronic Merten GmbH and Co KG
Original Assignee
Pulsotronic Merten GmbH and Co KG
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Publication date
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Publication of EP0218882A2 publication Critical patent/EP0218882A2/en
Publication of EP0218882A3 publication Critical patent/EP0218882A3/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
    • B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
    • B07C5/36—Sorting apparatus characterised by the means used for distribution
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
    • B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
    • B07C5/34—Sorting according to other particular properties
    • B07C5/344—Sorting according to other particular properties according to electric or electromagnetic properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
    • B07C2501/00—Sorting according to a characteristic or feature of the articles or material to be sorted
    • B07C2501/0036—Sorting out metallic particles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S209/00—Classifying, separating, and assorting solids
    • Y10S209/906—Pneumatic or liquid stream feeding item

Definitions

  • the invention relates to a device for sorting out metal particles from a conveyed material flow, e.g. a regrind or granulate stream, according to the preamble of claim 1.
  • the delay device is formed by at least one deflection or bend of the delivery line between the metal detector and the sorting device.
  • the delivery line consists of a shaft, from the opposite walls of which several baffle plates protrude downwards, which partially overlap, and result in a delivery line with a serpentine profile.
  • the material to be conveyed slips over the baffle plates and falls on the opposite lower baffle plate when leaving a baffle plate, only relatively short sections with free fall being present.
  • the advantage of the known device is a reduction in the overall length, as a result of which the device can be made compact and overall fits into a handy housing.
  • Such a device can be easily installed in a suction or pressure delivery system. Due to the relatively strong curvature of the delivery line, congestion of the material to be conveyed can occur in the device. Furthermore, due to the vertical installation position of the device with horizontal conveyance, a relatively large offset between the incoming and outgoing part of the delivery line must be accepted, which can only be compensated for by several pipe bends. Special care must therefore be taken when laying the delivery line in order to avoid congestion in the delivery line.
  • the object of the invention is to improve the device of the type described above with regard to the delay device, in particular to avoid congestion of the conveyed material in the device.
  • the material to be conveyed is swirled in the cyclone-like swirl chamber, so that the friction losses are relatively low.
  • the swirl can be spiral or helical.
  • There is a non-line-based guidance of the conveyed material which means that the conveyed material is in the swirl chamber longer than with a straight pipe guide. This measure prevents congestion of the conveyed material in the device.
  • the swirl chamber can consist of a cylindrical upper part and a funnel-shaped lower part, the flow being introduced tangentially into the cylindrical part. Due to the centrifugal and gravitational force acting on the flow, a swirl flow is formed, through which the conveying path of the material to be conveyed is extended, so that the metal detector can be arranged in the immediate vicinity of the swirl chamber.
  • the funnel serves as a collector of the material to be conveyed, so that continuous conveying through the delivery nozzle can take place. Conversely, identified conveyed material contaminated by metal particles can leave the device in free fall.
  • a suction device to the ejection nozzle via a failure container, which accelerates the separation process and prevents air from entering the delivery line, for example, during suction delivery, which interferes with the delivery process.
  • the ejection nozzle and the failure container it is possible to design the ejection nozzle and the failure container as a bypass to the delivery line, so that an additional suction device is unnecessary.
  • the functional reliability of the device is improved since the slide is installed transversely to the flow and thus prevents material or metal particles from getting stuck in the sorting device.
  • Both nozzles are controlled by a slide each, but operated by a common drive mechanism.
  • the second metal detector opens the air inlet valve, so that the delivery breaks down in the outgoing part of the delivery line.
  • the metal particle can be removed, for example, from the ejection nozzle using a pig or pipe broom.
  • the device shown in the figures of the drawing serves to separate metallic contaminants, such as chips, screws, nuts and the like, contained in powdery, granular or lumpy conveyed material, such as flour, sugar, tablets or granules.
  • the device consists of a vortex chamber, generally designated 7, with an upper cylindrical part 8 and a lower funnel-shaped part 9.
  • the upper cylindrical part 8 is closed by a cover 10, while an angled piece is connected to the lower funnel-shaped part 9, which comes from the delivery nozzle 11 and the ejection nozzle 12 there.
  • the delivery nozzle 11 branches horizontally and the ejection nozzle 12 vertically. Both nozzles 11, 12 form an angle of 90 ° and go directly adjacent to one another from the funnel-shaped part 9.
  • the sorting device designed as an angle slide 13, 14 is attached at an angle formed by the opening cross sections.
  • the angle slider 13, 14 controls the opening of the delivery nozzle 11 with one leg 15 and the opening of the ejection nozzle 12 with the other leg 16.
  • the two legs 15, 16 are offset from one another in the sliding direction, so that when one leg 16 closes the ejection nozzle 12, the delivery nozzle 11 is open and vice versa, when the other leg 15 closes the delivery nozzle 11, the ejection nozzle 12 is open.
  • the legs 15, 16 are aligned with one another, but have mutually offset openings 17, 18, which alternately open the connecting pieces 11, 12.
  • the slider 13 or 14 is connected to the actuating mechanism 20 via the joint 19.
  • This can be a hydraulic or pneumatic cylinder or an electromagnet (solenoid), the actuator of which engages the angle slide.
  • the actuating mechanism 20 is actuated by the control unit 21, which can be a hydraulic, pneumatic or magnetic valve or a switch.
  • the control unit 21 has an electrical input which is connected to the evaluation unit 22 of the metal detector 23.
  • the metal detector 23 is an inductively acting device which has an opening which is penetrated by an alternating electromagnetic field. The metal detector 23 is plugged with this opening onto the non-metallic inlet connection 24 of the delivery line, so that the cross-section of this connection 24 is also penetrated by the alternating electromagnetic field.
  • the delivery nozzle 11 is connected to the delivery line 25.
  • the delivery line 25 is connected via the separator 36 to a suction device 37, e.g. a suction fan connected.
  • the separator 36 contains a filter 38 which allows air to pass through, but is impermeable to the material to be conveyed. The material to be conveyed falls out of the separator 36 into a collecting container 39.
  • the metal detector 23 sends a signal to the evaluation unit via its output, which converts the output signal of the metal detector into a switching signal with which the control unit 21, which switches on the actuating mechanism 20, is actuated.
  • the angle slide 13, 14 is brought from its initial position, in which it closes the ejection nozzle 12 with the leg 16 and releases the delivery nozzle with the opening 17, into the second end position, in which the leg 15 closes the delivery nozzle 11 and the ejection nozzle 12 opens.
  • the conveying flow is thus interrupted for a certain time, in which the conveyed material located in the swirl chamber 7 with the metal particles is excreted through the ejection nozzle 12.
  • the corresponding conduction or guidance of the conveyed material in the swirl chamber 7 results in a delay effect which, as a result, corresponds to a reduction in the conveying speed or the reaction time.
  • the metal detector 23 can namely be arranged closer to the sorting device (angle slide) than in the case of a straight conveyor line section. As can be seen from the figures, the metal detector 23 is located directly on the swirl chamber 7.
  • the swirl chamber 7, nozzle 24 and metal detector 23 can form a structural unit.
  • the inlet connection 24 is located on the upper edge of the cylindrical part 8 of the swirl chamber 7. A free swirl flow or turbulence flow can build up between the connection 24 and the connection 11.
  • the delivery line 25 Connected to the delivery nozzle 11 is the delivery line 25, on which a further metal detector 26 corresponding to the metal detector 23 is attached, which via the evaluation unit 27 and the control unit 28 actuates a false air valve 29 installed in the delivery line 25 at a distance from the metal detector 26. If, contrary to expectations, a metal particle enters the delivery line 25 through the delivery nozzle 11, this metal particle generates a signal in the metal detector 26 with which the false air valve 29 is opened. The promotion is interrupted on the section between the delivery nozzle 11 and the false air valve 29. In this case, the line section can be emptied, for example, through the ejection connector 12. In addition, a maintenance flap, not shown, can be installed in the delivery line 25. For these special maintenance tasks, the cross section of the ejection connector 12 is larger than the cross section of the delivery connector 11 and is, for example, rectangular, as can be seen from FIG. The corresponding opening 18 in the angle slide 14 is also rectangular.
  • a swirl flow is achieved by arranging the inlet connection piece 24 tangentially.
  • a helical vortex is formed in the material to be conveyed with a core largely free of material to be conveyed in the interior of the vortex chamber 7.
  • baffle or guide surfaces 33, 34 are provided, on which the material to be conveyed is deflected or swirled.
  • the inlet connection 24 can be aligned radially to the swirl chamber 7.
  • the material to be conveyed is flung vertically upward against the cover 10 serving as a baffle surface by the inlet nozzle 24, as a result of which strong turbulence is generated.
  • the cover 10 serving as a baffle surface by the inlet nozzle 24, as a result of which strong turbulence is generated.
  • the flow is interrupted when the delivery nozzle is closed by the slide 13, 14, that is, when the separation process is taking place.
  • the swirl chamber 7 is emptied, the material to be conveyed remains in the delivery line in front of the swirl chamber.
  • the vacuum must be re-established in the feed line in front of the swirl chamber before the feed can start again. This can lead to the line becoming blocked.
  • a suction port 36 can be connected to the ejection port 12, with which the vacuum in the delivery line in front of the device is maintained by means of a corresponding suction device, whereby the delivery up to the swirl chamber 7 is maintained even during the separation process .
  • the suction port 36 can be connected directly to the delivery line 25.
  • a sieve 37 is attached in front of the suction nozzle 36.
  • the sorting device has a flap 40 which can be pivoted about the axis 41 between a first position, which is shown in solid lines in the drawing, and a second position, which is shown in broken lines.
  • the funnel-shaped part 9 is followed by a Y-shaped pipe branch 42, from the inlet region 43 of which the ejection nozzle 12 extends in a straight line, while the delivery nozzle 11 branches off at an angle, for example at an angle of approximately 30 ° .
  • the axis 41 is mounted, on which the plate 40 is fixed tangentially with screws 44.
  • the flap 40 closes the ejection nozzle 12, whereby it runs parallel to the walls or to the axis of the delivery nozzle 11.
  • the outer end edge 45 of the flap 40 lies against the rectilinearly continuous wall of the inlet area 43 or ejection nozzle 12, so that the flap 40 lies obliquely in front of the ejection nozzle 12.
  • the end of the flap 40 facing away from the end edge 45 is fastened to the axis 41.
  • One end of the axis 41 is fixed to a lever arm 46.
  • the piston rod 47 of the actuating mechanism 20, which is designed as a piston-cylinder unit engages. If the piston rod 27 is retracted, then the lever 46 is pivoted clockwise according to FIG. 7 around the axis 41, whereby the axis 41 is rotated and the flap 40 reaches the second position shown in broken lines, in which it closes the delivery nozzle 11 and releases the ejection nozzle 12.
  • the outer end region of the flap 40 lies against a seal 49 which is fastened to the wall of the delivery nozzle 11. In the second position of the flap 40, this flap lies essentially parallel to the walls or the axis of the ejection connector 12.
  • Deflectors 50, 51 are arranged on the opposite walls of the inlet area 43, which protrude beyond the end edge 45 in the first and the second position of the flap 40, in order to prevent the granulate from being dammed up by the end edge 45.
  • All pipes of the branch 42 have a rectangular cross section, so that the flap 40 is also rectangular.
  • the length of the flap 40 is greater than the width of the nozzle 11 and 12, which have the same cross sections.
  • other pipe cross sections can also be used. In the case of circular tubes, the flap 40 would have an elliptical shape.

Landscapes

  • Combined Means For Separation Of Solids (AREA)
  • Sorting Of Articles (AREA)
  • Air Transport Of Granular Materials (AREA)
  • Cyclones (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Description

Die Erfindung bezieht sich auf eine Vorrichtung zum Aussortieren von Metallteilchen aus einem Fördergutstrom, z.B. einem Mahlgut- oder Granulatstrom, entsprechend dem Oberbegriff des Patentanspruchs 1.The invention relates to a device for sorting out metal particles from a conveyed material flow, e.g. a regrind or granulate stream, according to the preamble of claim 1.

Eine derartige Vorrichtung ist durch die Europäische Patentveröffentlichung 0 143 231 bekannt. Bei der bekannten Vorrichtung ist die Verzögerungseinrichtung durch mindestens eine Umlenkung oder Biegung der Förderleitung zwischen dem Metalldetektor und der Aussortiereinrichtung gebildet. Bei einer bestimmten Variante besteht die Förderleitung aus einem Schacht, von dessen einander gegenüberliegenden Wänden mehrere Prallbleche schräg nach unten abstehen, die sich teilweise überlappen, und eine Förderleitung mit schlangenförmigem Verlauf ergeben. Dabei rutscht das Fördergut über die Prallbleche und fällt beim Verlassen eines Prallblechs auf das gegenüberliegende nächst niedrigere Prallblech, wobei jeweils nur relativ kurze Abschnitte mit freiem Fall vorhanden sind. Der Vorteil der bekannten Vorrichtung besteht in einer Verkleinerung der Baulänge, wodurch die Vorrichtung kompakt ausgebildet werden kann und insgesamt in ein handliches Gehäuse hineinpaßt. Eine derartige Vorrichtung läßt sich auf einfache Weise in ein Saug- oder Druckfördersystem einbauen. Durch die relativ starke Krümmung der Förderleitung können Stauungen des Fördergutes in der Vorrichtung auftreten. Ferner muß durch die senkrechte Einbaulage der Vorrichtung bei horizontaler Förderung ein relativ großer Versatz zwischen ankommendem und abgehendem Teil der Förderleitung in Kauf genommen werden, der nur durch mehrere Rohrbögen wieder ausgeglichen werden kann. Bei der Verlegung der Förderleitung muß deshalb in dieser Hinsicht besondere Rücksicht genommen werden, um Stauungen in der Förderleitung zu vermeiden.Such a device is known from European patent publication 0 143 231. In the known device, the delay device is formed by at least one deflection or bend of the delivery line between the metal detector and the sorting device. In a certain variant, the delivery line consists of a shaft, from the opposite walls of which several baffle plates protrude downwards, which partially overlap, and result in a delivery line with a serpentine profile. The material to be conveyed slips over the baffle plates and falls on the opposite lower baffle plate when leaving a baffle plate, only relatively short sections with free fall being present. The advantage of the known device is a reduction in the overall length, as a result of which the device can be made compact and overall fits into a handy housing. Such a device can be easily installed in a suction or pressure delivery system. Due to the relatively strong curvature of the delivery line, congestion of the material to be conveyed can occur in the device. Furthermore, due to the vertical installation position of the device with horizontal conveyance, a relatively large offset between the incoming and outgoing part of the delivery line must be accepted, which can only be compensated for by several pipe bends. Special care must therefore be taken when laying the delivery line in order to avoid congestion in the delivery line.

Die Aufgabe der Erfindung besteht darin, die Vorrichtung der eingangs beschriebenen Art hinsichtlich der Verzögerungseinrichtung zu verbessern, insbesondere Stauungen des Fördergutes in der Vorrichtung zu vermeiden.The object of the invention is to improve the device of the type described above with regard to the delay device, in particular to avoid congestion of the conveyed material in the device.

Die Aufgabe wird erfindungsgemäß mit den Merkmalen des Anspruchs 1 gelöst. Weiterbildungen der Erfindung sind in den Unteransprüchen beschrieben.The object is achieved with the features of claim 1. Developments of the invention are described in the subclaims.

Bei der erfindungsgemäßen Ausbildung der Vorrichtung findet eine Verwirbelung des Fördergutes in der zyklonartigen Wirbelkammer statt, so daß die Reibungsverluste relativ gering sind. Die Verwirbelung kann spiral- oder schraubenlinienförmig sein. Es tritt eine nicht leitungsgebundene Führung des Fördergutes ein, die bewirkt, daß sich das Fördergut länger in der Wirbelkammer befindet, als bei gerader Rohrführung. Durch diese Maßnahme werden Stauungen des Fördergutes in der Vorrichtung vermieden.In the embodiment of the device according to the invention, the material to be conveyed is swirled in the cyclone-like swirl chamber, so that the friction losses are relatively low. The swirl can be spiral or helical. There is a non-line-based guidance of the conveyed material, which means that the conveyed material is in the swirl chamber longer than with a straight pipe guide. This measure prevents congestion of the conveyed material in the device.

Die Wirbelkammer kann aus einem zylindrischen oberen Teil und einem trichterförmigen unteren Teil bestehen, wobei der Förderstrom tangential in den zylindrischen Teil eingeleitet wird. Durch die auf den Förderstrom einwirkende Flieh- und Schwerkraft bildet sich eine Drallströmung aus, durch die der Förderweg des Fördergutes verlängert wird, so daß der Metalldetektor in unmittelbarer Nähe der Wirbelkammer angeordnet werden kann.The swirl chamber can consist of a cylindrical upper part and a funnel-shaped lower part, the flow being introduced tangentially into the cylindrical part. Due to the centrifugal and gravitational force acting on the flow, a swirl flow is formed, through which the conveying path of the material to be conveyed is extended, so that the metal detector can be arranged in the immediate vicinity of the swirl chamber.

Gemäß Anspruch 2 dient der Trichter als Sammler des Fördergutes, so daß eine kontinuierliche Weiterförderung durch den Förderstutzen erfolgen kann. Erkanntes, durch Metallteilchen verunreinigtes Fördergut kann dagegen gemäß Anspruch 4 die Vorrichtung in freiem Fall verlassen. Es ist jedoch auch ohne weiteres denkbar, an den Auswerfstutzen über einen Ausfallbehälter eine Saugvorrichtung anzuschließen, die den Ausscheidevorgang beschleunigt und verhindert, daß beispielsweise bei Saugförderung Luft in die Förderleitung eintreten kann, die den Fördervorgang stört. Ferner ist es möglich, den Auswerfstutzen und den Ausfallbehälter als Bypass zur Förderleitung auszubilden, so daß sich eine zusätzliche Saugvorrichtung erübrigt.According to claim 2, the funnel serves as a collector of the material to be conveyed, so that continuous conveying through the delivery nozzle can take place. Conversely, identified conveyed material contaminated by metal particles can leave the device in free fall. However, it is also easily conceivable to connect a suction device to the ejection nozzle via a failure container, which accelerates the separation process and prevents air from entering the delivery line, for example, during suction delivery, which interferes with the delivery process. Furthermore, it is possible to design the ejection nozzle and the failure container as a bypass to the delivery line, so that an additional suction device is unnecessary.

Gemäß Anspruch 4 ergeben sich günstige Einbaubedingungen für die Aussortiereinrichtung, da Auswerfstutzen und Förderstutzen unmittelbar benachbart aneinanderstoßen.According to claim 4, there are favorable installation conditions for the rejection device, since ejection nozzle and delivery nozzle abut directly adjacent to one another.

Mit Hilfe des Winkelschiebers als Aussortiereinrichtung nach Anspruch 5 wird die Funktionssicherheit der Vorrichtung verbessert, da der Schieber quer zum Förderstrom eingebaut ist und somit verhindert wird, daß sich Fördergut oder Metallteilchen in der Aussortiereinrichtung festsetzen. Beide Stutzen werden durch je einen Schieber gesteuert, jedoch durch einen gemeinsamen Antriebsmechanismus betätigt.With the help of the angle slide as a sorting device according to claim 5, the functional reliability of the device is improved since the slide is installed transversely to the flow and thus prevents material or metal particles from getting stuck in the sorting device. Both nozzles are controlled by a slide each, but operated by a common drive mechanism.

Durch die Weiterbildungen nach Anspruch 7 und 8 wird der Ausscheidevorgang verbessert. Ferner kann die relativ große Öffnung des Auswerfstutzens gleichzeitig zum Inspizieren oder Reinigen der Förderleitung dienen.The elimination process is improved by the developments according to claims 7 and 8. Furthermore, the relatively large opening of the ejection nozzle can simultaneously serve to inspect or clean the delivery line.

Für den Fall, daß wider Erwarten ein Metallteilchen durch die Aussortiereinrichtung nicht ausgeschieden wird, sondern in den Förderstutzen gelangt, öffnet gemäß Anspruch 11 der zweite Metalldetektor das Lufteinlaßventil, so daß in dem abgehenden Teil der Förderleitung die Förderung zusammenbricht. Das Metallteilchen kann in diesem Fall beispielsweise vom Auswerfstutzen her mit einem Rohrmolch bzw. Rohrbesen entfernt werden.In the event that, contrary to expectations, a metal particle is not separated out by the sorting device, but instead reaches the delivery nozzle, the second metal detector opens the air inlet valve, so that the delivery breaks down in the outgoing part of the delivery line. In this case, the metal particle can be removed, for example, from the ejection nozzle using a pig or pipe broom.

Nachfolgend sind anhand der Zeichnungen mehrere Ausführungen der Erfindung beschrieben.Several embodiments of the invention are described below with reference to the drawings.

Es zeigen:

  • Fig. 1 eine erste Ausführung der Vorrichtung mit einem zyklonartigen Aufbau der Wirbelkammer,
  • Fig. 2 die Draufsicht auf die Wirbelkammer bei offenem Deckel,
  • Fig. 3 einen Winkelschieber,
  • Fig. 4 einen weiteren Winkelschieber,
  • Fig. 5 eine weitere Ausführung der Vorrichtung mit horizontaler Einführung des Fördergutes in die Wirbelkammer,
  • Fig. 6 eine dritte Ausführung der Vorrichtung mit vertikaler Einführung des Fördergutes in die Wirbelkammer und
  • Fig. 7 einen Schnitt durch eine Aussortiereinrichtung mit Klappe.
Show it:
  • 1 shows a first embodiment of the device with a cyclone-like structure of the swirl chamber,
  • 2 is a top view of the swirl chamber with the lid open,
  • 3 shows an angle slide,
  • 4 shows a further angle slide,
  • 5 shows a further embodiment of the device with the horizontal introduction of the conveyed material into the swirl chamber,
  • Fig. 6 shows a third embodiment of the device with vertical introduction of the conveyed material into the swirl chamber and
  • Fig. 7 shows a section through a sorting device with a flap.

Die in den Figuren der Zeichnung dargestellte Vorrichtung dient zum Ausscheiden von in pulverförmigem, körnigem oder stückigem Fördergut, wie Mehl, Zucker, Tabletten oder Granulat, enthaltenen metallischen Verunreinigungen, wie Späne, Schrauben, Muttern u.dgl.The device shown in the figures of the drawing serves to separate metallic contaminants, such as chips, screws, nuts and the like, contained in powdery, granular or lumpy conveyed material, such as flour, sugar, tablets or granules.

Die Vorrichtung besteht aus einer generell mit 7 bezeichneten Wirbelkammer mit einem oberen zylindrischen Teil 8 und einem unteren trichterförmigen Teil 9. Der obere zylindrische Teil 8 ist durch einen Deckel 10 verschlossen, während am unteren trichterförmigen Teil 9 ein Winkelstück angeschlossen ist, welches aus dem Förderstutzen 11 und dem Auswerfstutzen 12 besteht. Dabei zweigt der Förderstutzen 11 horizontal und der Auswerfstutzen 12 vertikal ab. Beide Stutzen 11,12 schließen einen Winkel von 90° ein und gehen einander unmittelbar benachbart von dem trichterförmigen Teil 9 ab. Im Winkel, der von den Öffnungsquerschnitten gebildet wird, ist die als Winkelschieber 13,14 ausgebildete Aussortiereinrichtung angebracht.The device consists of a vortex chamber, generally designated 7, with an upper cylindrical part 8 and a lower funnel-shaped part 9. The upper cylindrical part 8 is closed by a cover 10, while an angled piece is connected to the lower funnel-shaped part 9, which comes from the delivery nozzle 11 and the ejection nozzle 12 there. The delivery nozzle 11 branches horizontally and the ejection nozzle 12 vertically. Both nozzles 11, 12 form an angle of 90 ° and go directly adjacent to one another from the funnel-shaped part 9. The sorting device designed as an angle slide 13, 14 is attached at an angle formed by the opening cross sections.

Der Winkelschieber 13,14 steuert mit dem einen Schenkel 15 die Öffnung des Förderstutzens 11 und mit dem anderen Schenkel 16 die Öffnung des Auswerfstutzens 12. Bei dem Winkelschieber von Fig. 3 sind die beiden Schenkel 15,16 in Schieberichtung gegeneinander versetzt angeordnet, so daß, wenn der eine Schenkel 16 den Auswerfstutzen 12 schließt, der Förderstutzen 11 offen ist und umgekehrt, wenn der andere Schenkel 15 den Förderstutzen 11 schließt, der Auswerfstutzen 12 offen ist. Bei dem Winkelschieber von Fig. 4 liegen die Schenkel 15,16 fluchtend zueinander, weisen aber gegeneinander versetzte Öffnungen 17,18 auf, die im Wechsel die Stutzen 11,12 öffnen.The angle slider 13, 14 controls the opening of the delivery nozzle 11 with one leg 15 and the opening of the ejection nozzle 12 with the other leg 16. In the case of the angle slider of FIG. 3, the two legs 15, 16 are offset from one another in the sliding direction, so that when one leg 16 closes the ejection nozzle 12, the delivery nozzle 11 is open and vice versa, when the other leg 15 closes the delivery nozzle 11, the ejection nozzle 12 is open. 4, the legs 15, 16 are aligned with one another, but have mutually offset openings 17, 18, which alternately open the connecting pieces 11, 12.

Der Schieber 13 bzw. 14 ist über das Gelenk 19 mit dem Betätigungsmechanismus 20 verbunden. Dabei kann es sich um einen Hydraulik- bzw. Pneumatikzylinder oder um einen Elektromagneten (Hubmagneten) handeln, dessen Stellglied an dem Winkelschieber angreift. Der Betätigungsmechanismus 20 wird durch die Steuereinheit 21 betätigt, die ein Hydraulik-, Pneumatik- oder Magnetventil oder ein Schalter sein kann. Die Steuereinheit 21 weist einen elektrischen Eingang auf, der mit der Auswerteeinheit 22 des Metalldetektors 23 verbunden ist. Der Metalldetektor 23 ist ein induktiv wirkendes Gerät, das eine Öffnung aufweist, die von einem elektromagnetischen Wechselfeld durchsetzt ist. Der Metalldetektor 23 ist mit dieser Öffnung auf den nichtmetallischen Einleitungsstutzen 24 der Förderleitung aufgesteckt, so daß der Querschnitt dieses Stutzens 24 ebenfalls von dem elektromagnetischen Wechselfeld durchsetzt wird.The slider 13 or 14 is connected to the actuating mechanism 20 via the joint 19. This can be a hydraulic or pneumatic cylinder or an electromagnet (solenoid), the actuator of which engages the angle slide. The actuating mechanism 20 is actuated by the control unit 21, which can be a hydraulic, pneumatic or magnetic valve or a switch. The control unit 21 has an electrical input which is connected to the evaluation unit 22 of the metal detector 23. The metal detector 23 is an inductively acting device which has an opening which is penetrated by an alternating electromagnetic field. The metal detector 23 is plugged with this opening onto the non-metallic inlet connection 24 of the delivery line, so that the cross-section of this connection 24 is also penetrated by the alternating electromagnetic field.

Der Förderstutzen 11 ist an die FÖrderleitung 25 angeschlossen. Die Förderleitung 25 ist über den Abscheider 36 an eine Saugeinrichtung 37, z.B. ein Sauggebläse, angeschlossen. Der Abscheider 36 enthält ein Filter 38, das Luft durchläßt, für das Fördergut aber undurchlässig ist. Das Fördergut fällt aus dem Abscheider 36 in einen Sammelbehälter 39.The delivery nozzle 11 is connected to the delivery line 25. The delivery line 25 is connected via the separator 36 to a suction device 37, e.g. a suction fan connected. The separator 36 contains a filter 38 which allows air to pass through, but is impermeable to the material to be conveyed. The material to be conveyed falls out of the separator 36 into a collecting container 39.

Befindet sich im Fördergut ein Metallteilchen, gibt der Metalldetektor 23 über seinen Ausgang ein Signal an die Auswerteeinheit, die das Ausgangssignal des Metalldetektors in ein Schaltsignal umformt, mit dem die Steuereinheit 21 betätigt wird, die den Betätigungsmechanismus 20 einschaltet. Der Winkelschieber 13,14 wird dabei aus seiner Ausgangslage, in der er mit dem Schenkel 16 den Auswerfstutzen 12 verschließt und mit der Öffnung 17 den Förderstutzen freigibt, in die zweite Endlage gebracht, in der der Schenkel 15 den Förderstutzen 11 schließt und den Auswerfstutzen 12 öffnet. Der Förderstrom wird also für eine gewisse Zeit unterbrochen, in der das in der Wirbelkammer 7 befindliche Fördergut mit den Metallteilchen durch den Auswerfstutzen 12 ausgeschieden wird.If there is a metal particle in the material to be conveyed, the metal detector 23 sends a signal to the evaluation unit via its output, which converts the output signal of the metal detector into a switching signal with which the control unit 21, which switches on the actuating mechanism 20, is actuated. The angle slide 13, 14 is brought from its initial position, in which it closes the ejection nozzle 12 with the leg 16 and releases the delivery nozzle with the opening 17, into the second end position, in which the leg 15 closes the delivery nozzle 11 and the ejection nozzle 12 opens. The conveying flow is thus interrupted for a certain time, in which the conveyed material located in the swirl chamber 7 with the metal particles is excreted through the ejection nozzle 12.

Durch die entsprechende Leitung bzw. Führung des Fördergutes in der Wirbelkammer 7 tritt ein Verzögerungseffekt ein, der im Ergebnis einer Verringerung der Fördergeschwindigkeit oder der Reaktionszeit entspricht. Der Metalldetektor 23 kann nämlich näher an der Aussortiereinrichtung (Winkelschieber) angeordnet werden, als bei gerader Förderleitungsstrecke. Wie aus den Figuren hervorgeht, befindet sich der Metalldetektor 23 unmittelbar an der Wirbelkammer 7. Wirbelkammer 7, Stutzen 24 und Metalldetektor 23 können eine bauliche Einheit bilden. Der Einleitungsstutzen 24 befindet sich am oberen Rand des zylindrischen Teils 8 der Wirbelkammer 7. Zwischen dem Stutzen 24 und dem Stutzen 11 kann sich eine freie Drallströmung bzw. Turbulenzströmung aufbauen.The corresponding conduction or guidance of the conveyed material in the swirl chamber 7 results in a delay effect which, as a result, corresponds to a reduction in the conveying speed or the reaction time. The metal detector 23 can namely be arranged closer to the sorting device (angle slide) than in the case of a straight conveyor line section. As can be seen from the figures, the metal detector 23 is located directly on the swirl chamber 7. The swirl chamber 7, nozzle 24 and metal detector 23 can form a structural unit. The inlet connection 24 is located on the upper edge of the cylindrical part 8 of the swirl chamber 7. A free swirl flow or turbulence flow can build up between the connection 24 and the connection 11.

An dem Förderstutzen 11 ist die Förderleitung 25 angeschlossen, auf der ein weiterer, dem Metalldetektor 23 entsprechender, Metalldetektor 26 aufgesteckt ist, der über die Auswerteeinheit 27 und der Steuereinheit 28 ein im Abstand vom Metalldetektor 26 in die Förderleitung 25 eingebautes Falschluftventil 29 betätigt. Sollte wider Erwarten ein Metallteilchen durch den Förderstutzen 11 in die Förderleitung 25 gelangen, so erzeugt dieses Metallteilchen in dem Metalldetektor 26 ein Signal, mit dem das Falschluftventil 29 geöffnet wird. Die Förderung wird auf den Abschnitt zwischen dem Förderstutzen 11 und dem Falschluftventil 29 unterbrochen. Der Leitungsabschnitt kann in diesem Fall beispielsweise durch den Auswerfstutzen 12 entleert werden. Außerdem kann noch eine nicht dargestellte Wartungsklappe in der Förderleitung 25 eingebaut werden. Für diese speziellen Wartungsaufgaben ist der Querschnitt des Auswerfstutzens 12 größer als der Querschnitt des Förderstutzens 11 und beispielsweise rechteckig ausgebildet, wie aus Figur 2 zu entnehmen ist. Die entsprechende Öffnung 18 im Winkelschieber 14 ist ebenfalls rechteckig.Connected to the delivery nozzle 11 is the delivery line 25, on which a further metal detector 26 corresponding to the metal detector 23 is attached, which via the evaluation unit 27 and the control unit 28 actuates a false air valve 29 installed in the delivery line 25 at a distance from the metal detector 26. If, contrary to expectations, a metal particle enters the delivery line 25 through the delivery nozzle 11, this metal particle generates a signal in the metal detector 26 with which the false air valve 29 is opened. The promotion is interrupted on the section between the delivery nozzle 11 and the false air valve 29. In this case, the line section can be emptied, for example, through the ejection connector 12. In addition, a maintenance flap, not shown, can be installed in the delivery line 25. For these special maintenance tasks, the cross section of the ejection connector 12 is larger than the cross section of the delivery connector 11 and is, for example, rectangular, as can be seen from FIG. The corresponding opening 18 in the angle slide 14 is also rectangular.

In dem Ausführungsbeispiel nach Figur 1 und 2 wird eine Drallströmung durch tangentiale Anordnung des Einleitungstutzens 24 erreicht. Es bildet sich ein schraubenlinienförmiger Wirbel im Fördergut mit einem weitgehend fördergutfreien Kern im Innern der Wirbelkammer 7.In the exemplary embodiment according to FIGS. 1 and 2, a swirl flow is achieved by arranging the inlet connection piece 24 tangentially. A helical vortex is formed in the material to be conveyed with a core largely free of material to be conveyed in the interior of the vortex chamber 7.

In dem Ausführungsbeispiel der Erfindung nach Figur 5 sind Prall- bzw. Leitflächen 33,34 vorgesehen, an denen eine Umlenkung oder Verwirbelung des Fördergutes erfolgt. Bei dieser Ausführung kann der Einleitungsstutzen 24 radial zur Wirbelkammer 7 ausgerichtet sein.In the exemplary embodiment of the invention according to FIG. 5, baffle or guide surfaces 33, 34 are provided, on which the material to be conveyed is deflected or swirled. In this embodiment, the inlet connection 24 can be aligned radially to the swirl chamber 7.

In dem Ausführungsbeispiel nach Figur 6 wird das Fördergut durch den Einleitungsstuzen 24 vertikal nach oben gegen den als Prallfläche dienenden Deckel 10 geschleudert, wodurch eine starke Turbulenz erzeugt wird. Durch geeignete Leitflächen 35 (Kegel) kann eine großflächige Verteilung des Fördergutes in der Wirbelkammer 7 erreicht werden.In the exemplary embodiment according to FIG. 6, the material to be conveyed is flung vertically upward against the cover 10 serving as a baffle surface by the inlet nozzle 24, as a result of which strong turbulence is generated. By means of suitable guide surfaces 35 (cones) a large-area distribution of the conveyed material in the swirl chamber 7 can be achieved.

In der Regel wird der Förderstrom unterbrochen, wenn der Förderstutzen durch den Schieber 13,14 geschlossen ist, wenn also gerade der Ausscheidevorgang erfolgt. Das bedeutet, daß sich zwar die Wirbelkammer 7 entleert, das Fördergut in der Förderleitung vor der Wirbelkammer jedoch liegenbleibt. Nach Beendigung des Ausscheidevorgangs muß also in der Förderleitung vor der Wirbelkammer das Vakuum neu aufgebaut werden, bevor die Förderung wieder einsetzen kann. Das kann zum Verstopfen der Leitung führen. Um die Förderung kontinuierlich aufrecht zu erhalten, kann an den Auswerfstutzen 12 ein Saugstutzen 36 angeschlossen werden, mit dem über eine entsprechende Saugvorrichtung das Vakuum in der Förderleitung vor der Vorrichtung aufrechterhalten wird, wodurch auch während des Ausscheidevorgangs die Förderung bis in die Wirbelkammer 7 aufrechterhalten wird. Gemäß den Figuren 1 und 5 kann der Saugstutzen 36 direkt an die Förderleitung 25 angeschlossen werden. Um zu verhindern, daß Material aus dem Auswerfstutzen 12 in die Förderleitung 25 zurückgelangt, ist vor dem Saugstutzen 36 ein Sieb 37 angebracht.As a rule, the flow is interrupted when the delivery nozzle is closed by the slide 13, 14, that is, when the separation process is taking place. This means that although the swirl chamber 7 is emptied, the material to be conveyed remains in the delivery line in front of the swirl chamber. After the separation process has ended, the vacuum must be re-established in the feed line in front of the swirl chamber before the feed can start again. This can lead to the line becoming blocked. In order to maintain the delivery continuously, a suction port 36 can be connected to the ejection port 12, with which the vacuum in the delivery line in front of the device is maintained by means of a corresponding suction device, whereby the delivery up to the swirl chamber 7 is maintained even during the separation process . According to Figures 1 and 5, the suction port 36 can be connected directly to the delivery line 25. In order to prevent material from the ejection nozzle 12 from returning to the delivery line 25, a sieve 37 is attached in front of the suction nozzle 36.

Fig. 7 zeigt ein Ausführungsbeispiel bei dem die Aussortiereinrichtung eine Klappe 40 aufweist, die zwischen einer ersten Stellung, die in der Zeichnung in durchgezogenen Linien dargestellt ist, und einer zweiten Stellung, die gestrichelt dargestellt ist, um die Achse 41 herum schwenkbar ist. An den trichterförmigen Teil 9 schließt sich ein Y-förmiger Rohrabzweig 42 an, von dessen Einlaßbereich 43 der Auswerfstutzen 12 geradlinig abgeht, während der Förderstutzen 11 schräg abzweigt, z.B. unter einem Winkel von etwa 30°. Im Verbindungsbereich der beiden Stutzen 11 und 12 ist die Achse 41 gelagert, an der die Platte 40 tangential mit Schrauben 44 befestigt ist. In der ersten Stellung, in der das Granulat vom Einlaßbereich 43 zum Förderstutzen 11 gefördert wird, verschließt die Klappe 40 den Auswerfstutzen 12, wobei sie parallel zu den Wänden bzw. zur Achse des Förderstutzens 11 verläuft. Die äußere Endkante 45 der Klappe 40 legt sich gegen die geradlinig durchgehende Wand von Einlaßbereich 43 bzw. Auswerfstutzen 12, so daß die Klappe 40 schräg vor dem Auswerfstutzen 12 liegt. Das der Endkante 45 abgewandte Ende der Klappe 40 ist an der Achse 41 befestigt.7 shows an exemplary embodiment in which the sorting device has a flap 40 which can be pivoted about the axis 41 between a first position, which is shown in solid lines in the drawing, and a second position, which is shown in broken lines. The funnel-shaped part 9 is followed by a Y-shaped pipe branch 42, from the inlet region 43 of which the ejection nozzle 12 extends in a straight line, while the delivery nozzle 11 branches off at an angle, for example at an angle of approximately 30 ° . In the connection area of the two connecting pieces 11 and 12, the axis 41 is mounted, on which the plate 40 is fixed tangentially with screws 44. In the first position, in which the granulate is conveyed from the inlet region 43 to the delivery nozzle 11, the flap 40 closes the ejection nozzle 12, whereby it runs parallel to the walls or to the axis of the delivery nozzle 11. The outer end edge 45 of the flap 40 lies against the rectilinearly continuous wall of the inlet area 43 or ejection nozzle 12, so that the flap 40 lies obliquely in front of the ejection nozzle 12. The end of the flap 40 facing away from the end edge 45 is fastened to the axis 41.

Das eine Ende der Achse 41 ist mit einem Hebelarm 46 fest verbunden. An dem Ende des Hebelarms 46 greift die Kolbenstange 47 des Betätigungsmechanismus 20, der als Kolben-Zylinder-Einheit ausgebildet ist, an. Wird die Kolbenstange 27 eingezogen, dann wird der Hebel 46 gemäß Fig. 7 im Uhrzeigersinn um die Achse 41 herum verschwenkt, wodurch die Achse 41 gedreht wird und die Klappe 40 in die gestrichelt dargestellte zweite Stellung gelangt, in der sie den Förderstutzen 11 verschließt und den Auswerfstutzen 12 freigibt. Der äußere Endbereich der Klappe 40 legt sich gegen eine Dichtung 49, die an der Wand des Förderstutzens 11 befestigt ist. In der zweiten Stellung der Klappe 40 liegt diese Klappe im wesentlichen parallel zu den Wänden bzw. der Achse des Auswerfstutzens 12.One end of the axis 41 is fixed to a lever arm 46. At the end of the lever arm 46, the piston rod 47 of the actuating mechanism 20, which is designed as a piston-cylinder unit, engages. If the piston rod 27 is retracted, then the lever 46 is pivoted clockwise according to FIG. 7 around the axis 41, whereby the axis 41 is rotated and the flap 40 reaches the second position shown in broken lines, in which it closes the delivery nozzle 11 and releases the ejection nozzle 12. The outer end region of the flap 40 lies against a seal 49 which is fastened to the wall of the delivery nozzle 11. In the second position of the flap 40, this flap lies essentially parallel to the walls or the axis of the ejection connector 12.

An den einander gegenüberliegenden Wänden des Einlaßbereichs 43 sind Abweiser 50,51 angeordnet, die in der ersten und der zweiten Stellung der Klappe 40 die Endkante 45 überragen, um zu verhindern, das Granulat durch die Endkante 45 aufgestaut wird.Deflectors 50, 51 are arranged on the opposite walls of the inlet area 43, which protrude beyond the end edge 45 in the first and the second position of the flap 40, in order to prevent the granulate from being dammed up by the end edge 45.

Sämtliche Rohrleitungen der Abzweigung 42 haben rechteckigen Querschnitt, so daß die Klappe 40 ebenfalls rechteckig ist. Die Länge der Klappe 40 ist größer als die Weite der Stutzen 11 und 12, die untereinander gleiche Querschnitte haben. Anstelle rechteckiger Rohrquerschnitte können auch andere Rohrquerschnitte verwendet werden. Bei kreisförmigen Rohren hätte die Klappe 40 eine ellipsenförmige Gestalt.All pipes of the branch 42 have a rectangular cross section, so that the flap 40 is also rectangular. The length of the flap 40 is greater than the width of the nozzle 11 and 12, which have the same cross sections. Instead of rectangular pipe cross sections, other pipe cross sections can also be used. In the case of circular tubes, the flap 40 would have an elliptical shape.

Claims (13)

1. A device for sorting out metal particles from a flow of material to be conveyed, e.g. a flow of grinding material or granule, comprising
- a metal detector (23) incorporated in the conveyor duct (24, 25) and contactlessly scanning the flow of material to be conveyed for metal particles;
- a sorting device arranged in the conveying direction behind said metal detector, being switchable between two end positions and opening a conveyor socket (11) in the one end position and an ejector socket (12) of the device in the other end position,
- and an actuator mechanism (20) driven by said metal detector (23), for controlling said sorting device in dependence on the signals from said metal detector, such that, if said metal detector detects a metal particle, the flow of material to be conveyed is temporarily lead through said ejector socket (12) and that the flow of material to be conveyed is subsequently lead into said conveyor duct again, after said metal part has been discharged,
- a retarding device provided in the flow of material to be conveyed between said metal detector (23) and said sorting device,

characterised in that
said retarding device consists of a whirl chamber (7) of a cyclone-like configuration, in which chamber a rotational or a turbulent stream is generated which prolongs the conveyance time of said material to be conveyed.
2. The device according to Claim 1, characterised in that said rotational or turbulent stream of the material to be conveyed is collected in a hopper-shaped portion (9) of said whirl chamber (79) and lead into said conveyor socket (11) arranged transversally, preferably under an angle of 90°, with respect to the longitudinal axis of said whirl chamber (7).
3. The device according to Claim 1 or 2, characterised in that said ejector socket (12) is connected to the end of said hopper-shaped portion (9) in the direction of the longitudinal axis of said whirl chamber (7).
4. The device according to one of Claims 1 to 3, characterised in that said ejector socket (12) and said conveyor socket (11) depart at a right angle with respect to each other from said hopper-shaped portion (9).
5. The device according to one of Claims 1 to 4, characterised in that said sorting device is provided as an angular slide (13, 14) having two legs (15, 16) forming an angle, said legs closing either said ejector socket (12) or said conveyor socket (11), one leg (15) being associated with the opening of said ejector socket (12) and the other leg (16) being associated with the opening of said conveyor socket (11). 6. The device according to Claim 5, characterised in that each leg (15, 16) is provided with a passage opening (17, 18), both passage openings being arranged mutually offset in the direction of movement of said bent slide (14).
7. The device according to one of Claims 1 to 4, characterised in that said sorting device is provided with a flap (40) pivotable around an axis (41), which in a first position closes said ejector socket (12) and opens said conveyor socket (11) and which in a second position opens said ejector socket (12) and closes said conveyor socket (11), that said conveyor socket (11) extends obliquely from the inlet portion (43) of said sorting device, whereas said ejector socket (12) rectilinearly joins said inlet portion (43) and that said flap (40) extends substantially parallel to said conveyor socket (11) in said first position and is substantially parallel to said ejector socket (12) in said second position.
8. The device according to Claim 7, characterised in that deflectors (50, 51) are arranged on the walls of said inlet portion (43) in said inlet portions in front of those locations in which the end edge (45) of said flap (40) is located in said first and second positions, said deflectors protruding beyond said end edges.
9. The device according to one of Claims 1 to 8, characterised in that said ejector socket (12) has a larger diameter than said conveyor socket (11).
10. The device according to one of Claims 1 to 9, characterised in that said rotational or turbulent stream is generated by impact or guiding elements (33, 34, 35) mounted within said whirl chamber (7).
11. The device according to one of Claims 1 to 10, characterised in that said flow of material to be conveyed is scanned for further metal particles in the conveying direction behind said whirl chamber (7) by a second metal detector (26) mounted within said conveyor duct, which upon detecting a metal particle not discharged through said ejector socket (12) actuates an air inlet valve (29) mounted in the conveying direction behind said second metal detector (26) within said conveyor duct (25).
12. The device according to one of Claims 1 to 11, characterised in that a suction device (37) is connected to said ejector socket (12) via a suction pipe (36).
13. The device according to Claim 12, characterised in that the suction socket (36) is connected to a portion (25) of said conveyor duct (25) connected with said suction device (37).
EP86112134A 1985-09-19 1986-09-02 Device for sorting metallic particles Expired EP0218882B1 (en)

Applications Claiming Priority (2)

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DE19853533390 DE3533390A1 (en) 1985-09-19 1985-09-19 DEVICE FOR SEPARATING METAL PARTICLES
DE3533390 1985-09-19

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EP0218882A2 EP0218882A2 (en) 1987-04-22
EP0218882A3 EP0218882A3 (en) 1988-02-03
EP0218882B1 true EP0218882B1 (en) 1989-11-29

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JP (1) JPH0764426B2 (en)
AR (1) AR241239A1 (en)
DE (2) DE3533390A1 (en)

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JPH0764426B2 (en) 1995-07-12
AR241239A1 (en) 1992-02-28
US4763792A (en) 1988-08-16
DE3533390A1 (en) 1987-03-19
JPS6274831A (en) 1987-04-06
EP0218882A2 (en) 1987-04-22
DE3667148D1 (en) 1990-01-04
EP0218882A3 (en) 1988-02-03

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