EP0218575A2 - Screening device - Google Patents

Screening device Download PDF

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Publication number
EP0218575A2
EP0218575A2 EP86890276A EP86890276A EP0218575A2 EP 0218575 A2 EP0218575 A2 EP 0218575A2 EP 86890276 A EP86890276 A EP 86890276A EP 86890276 A EP86890276 A EP 86890276A EP 0218575 A2 EP0218575 A2 EP 0218575A2
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EP
European Patent Office
Prior art keywords
screening device
grate bars
drives
frame
grate
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.)
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Application number
EP86890276A
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German (de)
French (fr)
Other versions
EP0218575A3 (en
Inventor
Johannes Brüderlein
Leander Ahorner
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IFE Industrie-Einrichtungen Fertigungs-Aktiengesellschaft
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IFE Industrie-Einrichtungen Fertigungs-Aktiengesellschaft
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Publication date
Priority claimed from AT104886A external-priority patent/AT389062B/en
Application filed by IFE Industrie-Einrichtungen Fertigungs-Aktiengesellschaft filed Critical IFE Industrie-Einrichtungen Fertigungs-Aktiengesellschaft
Publication of EP0218575A2 publication Critical patent/EP0218575A2/en
Publication of EP0218575A3 publication Critical patent/EP0218575A3/en
Withdrawn legal-status Critical Current

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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
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling 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
    • 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
    • B07B1/48—Stretching devices for screens
    • B07B1/485—Devices for alternately stretching and sagging screening surfaces

Definitions

  • the invention relates to a sieve device with a grate, which has a plurality of grate bars, which are connected by flexible sieve elements attached to them, bridging the gaps between the grate bars.
  • a known device of this type in which the grate bars are arranged transversely to the sieving direction, at least two frame systems which are moved relative to one another are provided, the grate bars of the systems interlocking in pairs.
  • the invention solves the two tasks, on the one hand to increase the sieving capacity and, on the other hand, to largely compensate the mass forces within the grate.
  • the first object is achieved in that the longitudinal or, as is known, transverse to the direction of the grate bars on a frame in several directions, preferably in two opposite directions, movably mounted in a plane perpendicular to their longitudinal axes and individually on both of them Ends are provided with a drive that sets them in motion.
  • An advantageous embodiment of the invention is that the grate bars are mounted in the frame and the drives are unbalance drives. Instead of the unbalance drives, rotating eccentrics can also be used, the grate bars being prevented from rotating about their longitudinal axis.
  • the mass balance can be done by successive alternating or in groups successive opposite directions of rotation, but also by using counterweights.
  • the arrangement of the drives can be varied within wide limits by phase shifts.
  • the phase angle is preferably , where a is an integer greater than 1.
  • the number of drives in a group can be equal to the number a.
  • the sieve In the case of grate bars running longitudinally to the direction of sieve, the sieve is, as is known per se, inclined in the direction of sieve and the outermost flexible sieve elements are tightly connected to the sieve frame.
  • Such an arrangement has the advantage of eliminating the otherwise unavoidable leaks at the lateral longitudinal edges of the sieve when sieving fine goods.
  • the task of the material to be screened advantageously takes place at a sufficiently large distance from the upper end of the screen to prevent problems with the sealing there.
  • the sieve elements At the lower end of the sieve, the sieve elements end at a sufficient distance from the sieve frame to allow the overflow to leave the sieve.
  • the invention relates to further refinements.
  • FIG. 1 shows a longitudinal section
  • FIG. 2 shows a top view
  • FIG. 3 shows a cross section through a screening device according to the invention
  • FIG. 4 shows the mounting of a grate bar and an unbalance drive assigned to it
  • FIGS. 5 and 6 show a longitudinal and cross section a screening device in which the grate bars are mounted on rotating eccentrics
  • Fig. 7 a storage of the grate bars by means of leaf springs
  • Figs. 8 and 9 a leaf spring storage of both a grate bar and the shaft of an eccentric drive.
  • a plurality of grate bars 2 are provided transversely to the direction of sieve, the spacing of which is bridged by sieve elements 3, so that a continuous sieve surface arises.
  • the screening device also has a feed hopper 4 and an outlet opening 5 and is provided with a cover 6.
  • the device is supported by springs 7 on a foundation 8.
  • Drive motors 9 are provided laterally on this foundation and drive the unbalance drives of the grate bars by means of shaft 10.
  • the grate bars consist of a tube 11, each of which has a welded flange 12 at its ends, which is firmly connected to a disk 14 by means of screws 13.
  • This disc is fastened to the frame 1 by means of a rubber ring 15 and can thus oscillate in the plane perpendicular to the rod axis.
  • the disk 14 is provided with a hub 16 on which a disk 18 is rotatably mounted by means of roller bearings 17. This is fixedly connected to a further disk 19, which is mounted on a shaft stub 20 by means of a wedge 21 in a rotationally fixed manner.
  • the shaft end 20 is seated in a tube 22 which passes through the hollow grate rod 11 and is connected in the same way to an unbalance drive on the other end thereof.
  • a connection is made between the motor 9 and the shaft tube 22 by means of the shaft 10.
  • the disc 18 is provided with a plurality of holes 23 into which weights 24 can be inserted.
  • the tube 11 carries a support 25 which is firmly connected to the sieve element 26.
  • the grate bars 11 are rotatably mounted on rotating eccentrics 31, but are prevented from being rotated by arms 32 which sit on the grate bars 11 and are combined to form two groups by means of longitudinal bars 33, 34, so that the grate bars of each group have the same phase position of the eccentric 31.
  • the eccentrics can have a common drive exhibit.
  • the eccentrics 31 are seated on a shaft 35 passing through the tubular tube rod 11 and are rotatably mounted on the frame by means of a roller bearing 36 and carry a counterweight 37 for mass balance.
  • the unbalance drives 38 are resiliently mounted on the frame 1 by means of leaf springs 39, whereby they can only carry out vibrations parallel to the plane of the frame around the grate bars moved by them.
  • the leaf springs 39 do not have to run perpendicular to the frame plane in their rest position, but they can enclose an angle smaller than 90 ° with this plane. The direction of vibration of the grate bars can thus be selected.
  • This leaf spring arrangement can also be used with eccentric drives, as can be seen from FIGS. 8 and 9.
  • the eccentric shaft 35 is supported by a bearing 40 which is resiliently connected to the frame 1 by means of leaf springs 41.
  • the grate bar is also resiliently connected to the frame 1 by means of a pair of leaf springs 39.
  • the grate bars only vibrate parallel to the frame plane. If the leaf springs 39 and / or 41 are arranged in a different position to the frame plane, then vibrations of the grate bars 11 can also be generated in various preselectable directions. The springs 39 and 41 do not have to be perpendicular to one another.
  • the leaf spring arrangement has the advantage over the design according to FIG. 4 that the energy losses are far less and therefore the power efficiency can be increased. Another advantage is that the leaf springs 39 prevent the grate bars 11 from twisting, so that they make the arrangement of bars 33, 34 according to FIG. 5 unnecessary.
  • phase shift leads to changes in spacing between the grate bars, which lead to the screen elements alternately sagging or being tensioned will. However, it is not possible for adjacent sieve elements to be tensioned at the same time.
  • the time interval between the tensioning of one element with respect to the neighboring element depends on the direction of the force vectors which are pressed onto the individual grate bars by the drives.
  • the drive of the unbalance drives can be independent, individually or in groups.
  • the direction of rotation, the frequency and / or the vibration range or the phase position of the unbalance drives can be set so that the screening device can be easily adjusted to an optimal performance even with changing properties of the screening material.
  • the direction of rotation and the speed of the two unbalance drives located at the ends of the grate bar are the same.
  • a separate drive motor can be provided for each unbalance drive.
  • the mass balance is better the more the speed of the unbalance drives matches. It is therefore advisable to provide a synchronization of the unbalance drives.
  • a toothed belt is preferably used for this.
  • the direction of the force vectors depends on the placement of the weights 24. If the two unbalance drives of a grate bar are considered, the weights 24 can be accommodated in different bores 23 so that the grate bar executes a wobbling movement. In the same way, by inserting the weights 24 into different bores 23, the phase angle between the unbalance drives of adjacent grate bars can be set. Weights with different masses result in different amplitudes.
  • the grate bars can also be provided in sections, with a grate bar arranged immovably on the frame between adjacent sections.
  • the design according to the invention results in a great adaptability of the screening device to the Properties of the screened material and the advantage that no or only a fraction of the mass forces are transferred to the foundation.

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  • Combined Means For Separation Of Solids (AREA)

Abstract

The invention relates to a screening device having a grate which has a plurality of grate bars (11) which are connected by means of flexible screening elements (3) which are attached to them and span the gaps between the grate bars, and brings about the solution of the two objects, on the one hand of increasing the screening yield and on the other hand of compensating to a large extent the inertial forces within the grate. This is achieved in that the grate bars (11) are mounted so as to be movable in a frame (1) in a plurality of directions, preferably in two mutually opposed directions in a plane perpendicular to their longitudinal axes and are individually provided at both of their ends with a drive (18, 19, 24; 31, 35) which sets them in motion. In this arrangement, the grate bars (11) can be resiliently mounted in the frame (1) and the drives can be unbalanced drives (18, 19, 24; 38), or the grate bars are mounted on both sides on rotating eccentrics (31) and prevented from rotating about their longitudinal axis. <IMAGE>

Description

Die Erfindung bezieht sich auf eine Siebvorrichtung mit einem Rost, der mehrere Roststäbe aufweist, die durch an ihnen befestigte, die Spalten zwischen den Roststäben überbrückende, flexible Siebelemente ver­bunden sind.The invention relates to a sieve device with a grate, which has a plurality of grate bars, which are connected by flexible sieve elements attached to them, bridging the gaps between the grate bars.

Bei einer bekannten Vorrichtung dieser Art, bei der die Roststäbe quer zur Siebrichtung angeordnet sind, sind mindestens zwei relativ zueinander bewegte Rahmen­systeme vorgesehen, wobei die Roststäbe der Systeme paarweise ineinandergreifen.In a known device of this type, in which the grate bars are arranged transversely to the sieving direction, at least two frame systems which are moved relative to one another are provided, the grate bars of the systems interlocking in pairs.

Die Erfindung löst die beiden Aufgaben, einerseits die Siebleistung zu erhöhen und anderseits die Massen­kräfte innerhalb des Rostes weitgehend zu kompensieren. Die erste Aufgabe wird dadurch gelöst, daß die längs oder, wie an sich bekannt, quer zur Siebrichtung ver­laufenden Roststäbe an einem Rahmen in mehreren Rich­tungen, vorzugsweise in zwei einander entgegengesetzten Richtungen, in einer Ebene senkrecht zu ihren Längs­achsen beweglich gelagert und einzeln an beiden ihrer Enden mit einem sie in Bewegung versetzenden Antrieb versehen sind. Eine vorteilhafte Ausbildung der Erfin­dung besteht darin, daß die Roststäbe im Rahmen gelagert und die Antriebe Unwuchtantriebe sind. Anstelle der Un­wuchtantriebe können auch rotierende Exzenter benutzt werden, wobei die Roststäbe an einer Verdrehung um ihre Längsachse verhindert sind. Der Massenausgleich kann durch aufeinanderfolgende abwechselnde oder gruppenweise aufeinanderfolgende entgegengesetzte Drehrichtungen, aber auch durch Anwendung von Gegengewichten herbeige­führt werden. Die Anordnung der Antriebe kann durch Phasenverschiebungen in weiten Grenzen variiert werden. Der Phasenwinkel beträgt vorzugsweise

Figure imgb0001
, wobei a eine ganze Zahl größer als 1 ist. Die Anzahl der Antriebe einer Gruppe kann gleich der Zahl a sein.The invention solves the two tasks, on the one hand to increase the sieving capacity and, on the other hand, to largely compensate the mass forces within the grate. The first object is achieved in that the longitudinal or, as is known, transverse to the direction of the grate bars on a frame in several directions, preferably in two opposite directions, movably mounted in a plane perpendicular to their longitudinal axes and individually on both of them Ends are provided with a drive that sets them in motion. An advantageous embodiment of the invention is that the grate bars are mounted in the frame and the drives are unbalance drives. Instead of the unbalance drives, rotating eccentrics can also be used, the grate bars being prevented from rotating about their longitudinal axis. The mass balance can be done by successive alternating or in groups successive opposite directions of rotation, but also by using counterweights. The arrangement of the drives can be varied within wide limits by phase shifts. The phase angle is preferably
Figure imgb0001
, where a is an integer greater than 1. The number of drives in a group can be equal to the number a.

Bei längs zur Siebrichtung verlaufenden Roststäben ist das Sieb, wie an sich bekannt, in Siebrichtung ge­neigt und die äußersten flexiblen Siebelemente sind mit dem Siebrahmen dicht verbunden. Eine solche Anordnung hat den Vorteil, beim Sieben feiner Güter die sonst un­vermeidbaren Undichtigkeiten an den seitlichen Längs­rändern des Siebes zu beheben. Die Aufgabe des Siebgutes erfolgt dabei vorteilhafterweise in genügend großem Ab­stand vom oberen Siebende, um Probleme mit der dortigen Abdichtung hintanzuhalten. Am unteren Siebende enden die Siebelemente in genügendem Abstand vom Siebrahmen, um dem Überlauf ein Verlassen des Siebes zu ermöglichen.In the case of grate bars running longitudinally to the direction of sieve, the sieve is, as is known per se, inclined in the direction of sieve and the outermost flexible sieve elements are tightly connected to the sieve frame. Such an arrangement has the advantage of eliminating the otherwise unavoidable leaks at the lateral longitudinal edges of the sieve when sieving fine goods. The task of the material to be screened advantageously takes place at a sufficiently large distance from the upper end of the screen to prevent problems with the sealing there. At the lower end of the sieve, the sieve elements end at a sufficient distance from the sieve frame to allow the overflow to leave the sieve.

Die Erfindung bezieht sich auf weitere Ausgestal­tungen.The invention relates to further refinements.

In der Zeichnung ist der Gegenstand der Erfindung in einer beispielsweisen Ausführungsform dargestellt. Es zeigen die Fig. 1 einen Längsschnitt, Fig. 2 eine Draufsicht, Fig. 3 einen Querschnitt durch eine erfin­dungsgemäße Siebvorrichtung, Fig. 4 die Lagerung eines Roststabes und eines ihm zugeordneten Unwuchtantriebes, die Fig. 5 und 6 einen Längs- und Querschnitt durch eine Siebvorrichtung, bei der die Roststäbe auf rotierenden Exzentern gelagert sind, Fig. 7 eine Lagerung der Rost­stäbe mittels Blattfedern und die Fig. 8 und 9 eine Blattfederlagerung sowohl eines Roststabes als auch der Welle eines Exzenterantriebes.In the drawing, the subject matter of the invention is shown in an exemplary embodiment. 1 shows a longitudinal section, FIG. 2 shows a top view, FIG. 3 shows a cross section through a screening device according to the invention, FIG. 4 shows the mounting of a grate bar and an unbalance drive assigned to it, FIGS. 5 and 6 show a longitudinal and cross section a screening device in which the grate bars are mounted on rotating eccentrics, Fig. 7 a storage of the grate bars by means of leaf springs and Figs. 8 and 9 a leaf spring storage of both a grate bar and the shaft of an eccentric drive.

In einem Rahmen 1 sind mehrere Roststäbe 2 quer zur Siebrichtung vorgesehen, deren Abstand durch Siebele­mente 3 überbrückt sind, so daß eine durchgehende Sieb­ fläche entsteht.In a frame 1 a plurality of grate bars 2 are provided transversely to the direction of sieve, the spacing of which is bridged by sieve elements 3, so that a continuous sieve surface arises.

Die Siebvorrichtung weist ferner einen Aufgabe­trichter 4 und eine Ausgangsöffnung 5 auf und ist mit einem Deckel 6 versehen. Die Einrichtung ist mittels Federn 7 auf einem Fundament 8 abgestützt.The screening device also has a feed hopper 4 and an outlet opening 5 and is provided with a cover 6. The device is supported by springs 7 on a foundation 8.

Seitlich sind auf diesem Fundament Antriebsmotore 9 vorgesehen, die mittels Welle 10 die Unwuchtantriebe der Roststäbe antreiben.Drive motors 9 are provided laterally on this foundation and drive the unbalance drives of the grate bars by means of shaft 10.

Gemäß Fig. 4 bestehen die Roststäbe aus einem Rohr 11, das an seinen Enden je einen angeschweißten Flansch 12 aufweist, der mittels Schrauben 13 mit einer Scheibe 14 fest verbunden ist. Diese Scheibe ist mittels eines Gummiringes 15 am Rahmen 1 befestigt und kann so­mit in der Ebene senkrecht zur Stabachse schwingen.4, the grate bars consist of a tube 11, each of which has a welded flange 12 at its ends, which is firmly connected to a disk 14 by means of screws 13. This disc is fastened to the frame 1 by means of a rubber ring 15 and can thus oscillate in the plane perpendicular to the rod axis.

Die Scheibe 14 ist mit einer Nabe 16 versehen, auf der mittels Wälzlager 17 eine Scheibe 18 drehbar gela­gert ist. Diese ist mit einer weiteren Scheibe 19 fest verbunden, welche auf einem Wellenstummel 20 mittels eines Keiles 21 drehfest angebracht ist. Der Wellen­stummel 20 sitzt in einem Rohr 22, das den hohlen Rost­stab 11 durchsetzt und auf dem anderen Ende desselben in gleicher Weise mit einem Unwuchtantrieb verbunden ist. Auf der nicht dargestellten Seite des Rahmens 1 ist mittels der Welle 10 eine Verbindung zwischen dem Motor 9 und dem Wellenrohr 22 hergestellt.The disk 14 is provided with a hub 16 on which a disk 18 is rotatably mounted by means of roller bearings 17. This is fixedly connected to a further disk 19, which is mounted on a shaft stub 20 by means of a wedge 21 in a rotationally fixed manner. The shaft end 20 is seated in a tube 22 which passes through the hollow grate rod 11 and is connected in the same way to an unbalance drive on the other end thereof. On the side of the frame 1, not shown, a connection is made between the motor 9 and the shaft tube 22 by means of the shaft 10.

Die Scheibe 18 ist mit mehreren Löchern 23 verse­hen, in die Gewichte 24 eingelegt werden können.The disc 18 is provided with a plurality of holes 23 into which weights 24 can be inserted.

Das Rohr 11 trägt eine Auflage 25, die mit dem Siebelement 26 fest verbunden ist.The tube 11 carries a support 25 which is firmly connected to the sieve element 26.

In Fig. 5 sind die Roststäbe 11 auf rotierenden Exzentern 31 drehbar gelagert, jedoch gegen eine Verdre­hung durch Arme 32 verhindert, die auf den Roststäben 11 sitzen und untereinander mittels Längsstäben 33,34 zu zwei Gruppen zusammengefaßt sind, so daß die Roststäbe jeder Gruppe die gleiche Phasenlage der Exzenter 31 auf­weisen. Die Exzenter können einen gemeinsamen Antrieb aufweisen. Die Exzenter 31 sitzen auf einer den rohr­förmigen Rohrstab 11 durchsetzenden Welle 35 und sind am Rahmen mittels eines Wälzlagers 36 drehbar gelagert und tragen zum Massenausgleich ein Gegengewicht 37.In Fig. 5, the grate bars 11 are rotatably mounted on rotating eccentrics 31, but are prevented from being rotated by arms 32 which sit on the grate bars 11 and are combined to form two groups by means of longitudinal bars 33, 34, so that the grate bars of each group have the same phase position of the eccentric 31. The eccentrics can have a common drive exhibit. The eccentrics 31 are seated on a shaft 35 passing through the tubular tube rod 11 and are rotatably mounted on the frame by means of a roller bearing 36 and carry a counterweight 37 for mass balance.

Gemäß Fig. 7 sind die Unwuchtantriebe 38 mittels Blattfedern 39 am Rahmen 1 federnd gelagert, wobei sie um die von ihnen bewegten Roststäbe nur Schwingungen parallel zur Rahmenebene ausführen können. Die Blatt­federn 39 müssen in ihrer Ruhelage nicht senkrecht zur Rahmenebene verlaufen, sondern sie können mit dieser Ebene einen Winkel kleiner als 90 ° einschließen. Es kann somit die Schwingrichtung der Roststäbe gewählt werden. Diese Blattfederanordnung kann auch bei Exzen­terantrieben benutzt werden, wie aus den Fig. 8 und 9 ersichtlich ist. Die Exzenterwelle 35 wird von einem Lager 40 getragen, das über Blattfedern 41 mit dem Rahmen 1 federnd verbunden ist. Der Roststab ist, wie in Fig. 7 gezeigt, auch hier mittels eines Blattfeder­paares 39 federnd mit dem Rahmen 1 verbunden. Auf diese Weise führen auch hier die Roststäbe nur Schwingungen parallel zur Rahmenebene aus. Werden die Blattfedern 39 und/oder 41 in einer anderen Lage zur Rahmenebene ange­ordnet, so lassen sich ebenfalls Schwingungen der Rost­stäbe 11 in verschiedenen vorwählbaren Richtungen er­zeugen. Die Federn 39 und 41 müssen nicht senkrecht auf­einander stehen.According to FIG. 7, the unbalance drives 38 are resiliently mounted on the frame 1 by means of leaf springs 39, whereby they can only carry out vibrations parallel to the plane of the frame around the grate bars moved by them. The leaf springs 39 do not have to run perpendicular to the frame plane in their rest position, but they can enclose an angle smaller than 90 ° with this plane. The direction of vibration of the grate bars can thus be selected. This leaf spring arrangement can also be used with eccentric drives, as can be seen from FIGS. 8 and 9. The eccentric shaft 35 is supported by a bearing 40 which is resiliently connected to the frame 1 by means of leaf springs 41. As shown in FIG. 7, the grate bar is also resiliently connected to the frame 1 by means of a pair of leaf springs 39. In this way, the grate bars only vibrate parallel to the frame plane. If the leaf springs 39 and / or 41 are arranged in a different position to the frame plane, then vibrations of the grate bars 11 can also be generated in various preselectable directions. The springs 39 and 41 do not have to be perpendicular to one another.

Die Blattfederanordnung hat den Vorteil gegenüber der Ausbildung gemäß Fig. 4, daß die Energieverluste weitaus geringer sind und daher der Leistungswirkungs­grad erhöht werden kann. Ein weiterer Vorteil besteht darin, daß durch die Blattfedern 39 die Roststäbe 11 an einer Verdrehung verhindert sind, so daß sie die Anord­nung von Stäben 33,34 gemäß Fig. 5 erübrigen.The leaf spring arrangement has the advantage over the design according to FIG. 4 that the energy losses are far less and therefore the power efficiency can be increased. Another advantage is that the leaf springs 39 prevent the grate bars 11 from twisting, so that they make the arrangement of bars 33, 34 according to FIG. 5 unnecessary.

Durch die Phasenverschiebung kommt es zwischen den Roststäben zu Abstandsänderungen, die dazu führen, daß die Siebelemente abwechselnd durchhängen oder gespannt werden. Es ist aber nicht möglich, daß benachbarte Sieb­elemente gleichzeitig gespannt sind. Der zeitliche Ab­stand zwischen dem Gespanntsein des einen Elementes ge­genüber dem benachbarten Element hängt von der Richtung der Kraftvektoren ab, die von den Antrieben den einzel­nen Roststäben aufgedrückt werden.The phase shift leads to changes in spacing between the grate bars, which lead to the screen elements alternately sagging or being tensioned will. However, it is not possible for adjacent sieve elements to be tensioned at the same time. The time interval between the tensioning of one element with respect to the neighboring element depends on the direction of the force vectors which are pressed onto the individual grate bars by the drives.

Der Antrieb der Unwuchtantriebe kann einzeln oder gruppenweise unabhängig sein. Hiebei kann die Drehrich­tung, die Frequenz und/oder die Schwingweite bzw. die Phasenlage der Unwuchtantriebe eingestellt werden, so daß sich die Siebvorrichtung auch bei wechselnden Eigen­schaften des Siebgutes leicht auf eine optimale Leistung einstellen läßt. Bei der gezeigten Ausführungsform ist die Drehrichtung und die Drehzahl der beiden an den En­den des Roststabes sitzenden Unwuchtantriebe gleich. Es kann aber für jeden Unwuchtantrieb ein eigener Antriebs­motor vorgesehen sein.The drive of the unbalance drives can be independent, individually or in groups. The direction of rotation, the frequency and / or the vibration range or the phase position of the unbalance drives can be set so that the screening device can be easily adjusted to an optimal performance even with changing properties of the screening material. In the embodiment shown, the direction of rotation and the speed of the two unbalance drives located at the ends of the grate bar are the same. However, a separate drive motor can be provided for each unbalance drive.

Der Massenausgleich ist umso besser, je mehr die Drehzahl der Unwuchtantriebe übereinstimmt. Es ist daher zweckmäßig, eine Synchronisation der Unwuchtantriebe vorzusehen. Vorzugsweise dient hiefür ein Zahnriemen.The mass balance is better the more the speed of the unbalance drives matches. It is therefore advisable to provide a synchronization of the unbalance drives. A toothed belt is preferably used for this.

Die Richtung der Kraftvektoren hängt von der Unter­bringung der Gewichte 24 ab. Werden die beiden Unwucht­antriebe eines Roststabes betrachtet, so können die Ge­wichte 24 in unterschiedlichen Bohrungen 23 unterge­bracht werden, so daß der Roststab eine Taumelbewegung ausführt. In gleicher Weise kann durch Einsetzen der Gewichte 24 in unterschiedliche Bohrungen 23 der Phasen­winkel zwischen den Unwuchtantrieben benachbarter Rost­stäbe eingestellt werden. Gewichte mit unterschiedlichen Massen ergeben unterschiedliche Amplituden.The direction of the force vectors depends on the placement of the weights 24. If the two unbalance drives of a grate bar are considered, the weights 24 can be accommodated in different bores 23 so that the grate bar executes a wobbling movement. In the same way, by inserting the weights 24 into different bores 23, the phase angle between the unbalance drives of adjacent grate bars can be set. Weights with different masses result in different amplitudes.

Die Roststäbe können auch abschnittweise vorgesehen sein, wobei zwischen benachbarten Abschnitten ein unbe­weglich am Rahmen angeordneter Roststab vorgesehen ist.The grate bars can also be provided in sections, with a grate bar arranged immovably on the frame between adjacent sections.

Durch die erfindungsgemäße Bauart ergibt sich eine große Anpassungsfähigkeit der Siebvorrichtung an die Eigenschaften des Siebgutes und der Vorteil, daß keine oder nur ein Bruchteil der Massenkräfte auf das Funda­ment übertragen wird.The design according to the invention results in a great adaptability of the screening device to the Properties of the screened material and the advantage that no or only a fraction of the mass forces are transferred to the foundation.

Claims (23)

1. Siebvorrichtung mit einem Rost, der mehrere Roststäbe aufweist, die durch an ihnen befestigte, die Spalten zwischen den Roststäben überbrückende, flexible Siebelemente verbunden sind, dadurch gekennzeichnet, daß die längs oder, wie an sich bekannt, quer zur Sieb­richtung angeordneten Roststäbe (11) in einem Rahmen (1) in mehreren Richtungen, vorzugsweise in zwei einander entgegengesetzten Richtungen, in einer Ebene senkrecht zu ihren Längsachsen beweglich gelagert und einzeln an beiden ihrer Enden mit einem sie in Bewegung versetzen­den Antrieb (18,19,24;31,35) versehen sind.1. Screening device with a grate, which has a plurality of grate bars which are connected by flexible sieve elements fastened to them and bridging the gaps between the grate bars, characterized in that the grate bars (11 ) movably mounted in a frame (1) in several directions, preferably in two opposite directions, in a plane perpendicular to their longitudinal axes and individually at both ends with a drive that sets them in motion (18, 19, 24; 31, 35 ) are provided. 2. Siebvorrichtung nach Anspruch 1, dadurch ge­kennzeichnet, daß die Roststäbe (11) im Rahmen (1) federnd gelagert sind.2. Screening device according to claim 1, characterized in that the grate bars (11) in the frame (1) are resiliently mounted. 3. Siebvorrichtung nach Anspruch 2, dadurch ge­kennzeichnet, daß zur federnden Lagerung der Rost­stäbe (11) Gummiringe (15) oder Blattfedern (39) vor­gesehen sind.3. Screening device according to claim 2, characterized in that rubber rings (15) or leaf springs (39) are provided for the resilient mounting of the grate bars (11). 4. Siebvorrichtung nach Anspruch 1, 2 oder 3, da­durch gekennzeichnet, daß die Antriebe Unwuchtantriebe (18,19,24;38) sind.4. Screening device according to claim 1, 2 or 3, characterized in that the drives are unbalance drives (18, 19, 24; 38). 5. Siebvorrichtung nach Anspruch 4, dadurch ge­kennzeichnet, daß Unwuchtantriebe (18,19,24;38) einzeln oder gruppenweise unabhängig voneinander antreibbar sind.5. Screening device according to claim 4, characterized in that unbalance drives (18, 19, 24; 38) can be driven individually or in groups independently of one another. 6. Siebvorrichtung nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß die Frequenz und/oder die Schwing­weite der Unwuchtantriebe (18,19,24;38) einzeln ein­stellbar sind.6. Screening device according to claim 4 or 5, characterized in that the frequency and / or the vibration range of the unbalance drives (18, 19, 24; 38) are individually adjustable. 7. Siebvorrichtung nach einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, daß die Unwuchtantriebe zumin­dest gruppenweise zwangssynchronisiert sind.7. Screening device according to one of claims 4 to 6, characterized in that the unbalance drives are positively synchronized at least in groups. 8. Siebvorrichtung nach Anspruch 7, dadurch ge­kennzeichnet, daß zur Zwangssynchronisation Zahnriemen­ getriebe vorgesehen sind.8. Screening device according to claim 7, characterized in that toothed belts for forced synchronization gear are provided. 9. Siebvorrichtung nach Anspruch 1, 2 oder 3, da­durch gekennzeichnet, daß die Roststäbe (11) beider­seits auf rotierenden Exzentern (31) gelagert und gegen einen Verdrehung um ihre Längsachse verhindert sind.9. Screening device according to claim 1, 2 or 3, characterized in that the grate bars (11) are mounted on both sides on rotating eccentrics (31) and are prevented from rotating about their longitudinal axis. 10. Siebvorrichtung nach Anspruch 3 und 9, dadurch gekennzeichnet, daß die zur federnden Lagerung der Roststäbe (11) dienenden Gummiringe (15) oder Blatt­federn (39) eine Verdrehung der Roststäbe verhindern.10. A screening device according to claim 3 and 9, characterized in that the rubber rings (15) or leaf springs (39) serving for the resilient mounting of the grate bars (11) prevent rotation of the grate bars. 11. Siebvorrichtung nach Anspruch 10, dadurch ge­kennzeichnet, daß die Exzenterwelle (35) federnd im Rahmen (1) gelagert ist.11. Screening device according to claim 10, characterized in that the eccentric shaft (35) is resiliently mounted in the frame (1). 12. Siebvorrichtung nach Anspruch 11, dadurch ge­kennzeichnet, daß zur federnden Lagerung der Exzenter­welle (35) Blattfedern (41) vorgesehen sind.12. Screening device according to claim 11, characterized in that leaf springs (41) are provided for the resilient mounting of the eccentric shaft (35). 13. Siebvorrichtung nach Anspruch 10 und 12, da­durch gekennzeichnet, daß die Richtungen, in denen die Roststäbe (11) und die Exzenterwelle (35) federnd ge­lagert sind, senkrecht zueinander sind.13. Screening device according to claim 10 and 12, characterized in that the directions in which the grate bars (11) and the eccentric shaft (35) are resilient are perpendicular to each other. 14. Siebvorrichtung nach Anspruch 9, dadurch ge­kennzeichnet, daß die auf den rotierenden Exzentern (31) gelagerten Roststäbe (11) Arme (32) aufweisen und mittels Stäben (33,34) gruppenweise miteinander ver­bunden sind, wobei sich die Roststäbe jeder Gruppe in gleicher Phasenlage befinden.14. Screening device according to claim 9, characterized in that the grate bars (11) mounted on the rotating eccentrics (31) have arms (32) and are connected to one another in groups by means of bars (33, 34), the grate bars of each group being in the same Phase position. 15. Siebvorrichtung nach einem der Ansprüche 9 bis 14, dadurch gekennzeichnet, daß die Exzenterwellen (35) mit einem Massenausgleichsgewicht (37) versehen sind.15. Screening device according to one of claims 9 to 14, characterized in that the eccentric shafts (35) are provided with a mass balance weight (37). 16. Siebvorrichtung nach einem der Ansprüche 9 bis 15, dadurch gekennzeichnet, daß die Drehbewegung der Exzenter (31) von einem Antrieb abgeleitet ist.16. Screening device according to one of claims 9 to 15, characterized in that the rotary movement of the eccentric (31) is derived from a drive. 17. Siebvorrichtung nach einem der Ansprüche 1 bis 16, dadurch gekennzeichnet, daß die Antriebe gleiche Drehzahl und benachbarte Antriebe eine Phasenverschie­bung aufweisen.17. Screening device according to one of claims 1 to 16, characterized in that the drives have the same speed and adjacent drives have a phase shift. 18. Siebvorrichtung nach Anspruch 17, dadurch ge­ kennzeichnet, daß der Phasenwinkel
Figure imgb0002
beträgt, wobei a eine ganze Zahl größer als 1 ist.18. Screening device according to claim 17, characterized ge indicates that the phase angle
Figure imgb0002
where a is an integer greater than 1. 19. Siebvorrichtung nach einem der Ansprüche 1 bis 18, dadurch gekennzeichnet, daß die Drehrichtung aller Antriebe gleich ist.19. Screening device according to one of claims 1 to 18, characterized in that the direction of rotation of all drives is the same. 20. Siebvorrichtung nach einem der Ansprüche 1 bis 19, dadurch gekennzeichnet, daß die Drehrichtung der Antriebe einzeln oder gruppenweise aufeinanderfolgend wechselt.20. Screening device according to one of claims 1 to 19, characterized in that the direction of rotation of the drives changes individually or in groups in succession. 21. Siebvorrichtung nach Anspruch 20, dadurch ge­kennzeichnet, daß die Anzahl der Antriebe einer Gruppe gleich der Zahl a ist.21. Screening device according to claim 20, characterized in that the number of drives in a group is equal to the number a. 22. Siebvorrichtung nach einem der Ansprüche 1 bis 21, dadurch gekennzeichnet, daß die beweglich angeord­neten Roststäbe (11) abschnittsweise angeordnet sind und zwischen benachbarten Abschnitten eine im Rahmen (1) unbeweglich angeordnete, mit den Siebelementen verbun­dene Leiste vorgesehen ist.22. Screening device according to one of claims 1 to 21, characterized in that the movably arranged grate bars (11) are arranged in sections and between adjacent sections is provided in the frame (1) immovably, connected to the screen elements ledge. 23. Siebvorrichtung nach einem der Ansprüche 1 bis 22, mit längs zur Siebrichtung verlaufenden Stäben, da­durch gekennzeichnet, daß das Sieb, wie an sich bekannt, in Siebrichtung geneigt ist, daß die Siebelemente seit­lich mit dem Siebrahmen dicht verbunden sind und in Siebrichtung gesehen vor dem Rahmen enden.23. Screening device according to one of claims 1 to 22, with rods extending longitudinally to the screen direction, characterized in that the screen, as known per se, is inclined in the screen direction, that the screen elements are laterally tightly connected to the screen frame and seen in the screen direction end the frame.
EP86890276A 1985-10-07 1986-10-07 Screening device Withdrawn EP0218575A3 (en)

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
AT2892/85 1985-10-07
AT289285 1985-10-07
AT373485 1985-12-23
AT3734/85 1985-12-23
AT69686 1986-03-17
AT696/86 1986-03-17
AT104886A AT389062B (en) 1986-04-21 1986-04-21 Screening device
AT1048/86 1986-04-21

Publications (2)

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EP0218575A2 true EP0218575A2 (en) 1987-04-15
EP0218575A3 EP0218575A3 (en) 1988-11-02

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HU (1) HU197235B (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0978327A2 (en) * 1998-08-03 2000-02-09 Hein, Lehmann Trenn- und Fördertechnik GmbH Screening machine
CZ298288B6 (en) * 2004-03-22 2007-08-15 Psp Engineering A. S. Bar screen, particularly charging bar screen for mineral mills
JP2014111236A (en) * 2012-12-05 2014-06-19 Fuji Xerox Co Ltd Screening device
DE102013018873B3 (en) * 2013-11-12 2014-11-27 Schenck Process Gmbh screening device
CN106622955A (en) * 2016-12-22 2017-05-10 新乡市振英机械设备有限公司 Screen cloth fixing structure for square swinging screen
EP3305423A1 (en) * 2016-10-05 2018-04-11 HEIN, LEHMANN GmbH Expansion shaft screening machine with optimised transport performance
CN110152990A (en) * 2019-06-13 2019-08-23 东北农业大学 A kind of ladder flexibility grain cleaning mechanism of imitative earthworm motion feature
WO2020225091A1 (en) * 2019-05-06 2020-11-12 Hein, Lehmann Gmbh Flip-flop screening machine

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1206372B (en) * 1964-09-26 1965-12-09 Albert Wehner Screen grate
DE1275339B (en) * 1967-07-13 1968-08-14 Albert Wehner Sieving machine
DE2424007A1 (en) * 1974-05-17 1975-11-27 Siteg Siebtech Gmbh Screening machine with flexible screen base - with two powered floor sections oscillating at varying frequencies
US3971715A (en) * 1973-02-27 1976-07-27 Albert Wehner Device for sieving, sorting, filtering and the like
DE2701341A1 (en) * 1977-01-14 1978-07-20 Fiedler Hans Guenter Screening machine for difficult material - with beater strips on oscillating frame with unbalanced mass drive
DE3411719A1 (en) * 1983-04-11 1984-10-11 Binder & Co AG, Gleisdorf, Steiermark Screen device
EP0197191A2 (en) * 1985-04-03 1986-10-15 Carl Schenck Ag Screening machine with a flexible screen bottom

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1206372B (en) * 1964-09-26 1965-12-09 Albert Wehner Screen grate
DE1275339B (en) * 1967-07-13 1968-08-14 Albert Wehner Sieving machine
US3971715A (en) * 1973-02-27 1976-07-27 Albert Wehner Device for sieving, sorting, filtering and the like
DE2424007A1 (en) * 1974-05-17 1975-11-27 Siteg Siebtech Gmbh Screening machine with flexible screen base - with two powered floor sections oscillating at varying frequencies
DE2701341A1 (en) * 1977-01-14 1978-07-20 Fiedler Hans Guenter Screening machine for difficult material - with beater strips on oscillating frame with unbalanced mass drive
DE3411719A1 (en) * 1983-04-11 1984-10-11 Binder & Co AG, Gleisdorf, Steiermark Screen device
EP0197191A2 (en) * 1985-04-03 1986-10-15 Carl Schenck Ag Screening machine with a flexible screen bottom

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0978327A3 (en) * 1998-08-03 2001-01-31 Hein, Lehmann Trenn- und Fördertechnik GmbH Screening machine
EP0978327A2 (en) * 1998-08-03 2000-02-09 Hein, Lehmann Trenn- und Fördertechnik GmbH Screening machine
CZ298288B6 (en) * 2004-03-22 2007-08-15 Psp Engineering A. S. Bar screen, particularly charging bar screen for mineral mills
JP2014111236A (en) * 2012-12-05 2014-06-19 Fuji Xerox Co Ltd Screening device
DE102013018873B3 (en) * 2013-11-12 2014-11-27 Schenck Process Gmbh screening device
WO2015070968A1 (en) 2013-11-12 2015-05-21 Schenck Process Gmbh Screening device
EP3305423A1 (en) * 2016-10-05 2018-04-11 HEIN, LEHMANN GmbH Expansion shaft screening machine with optimised transport performance
CN106622955A (en) * 2016-12-22 2017-05-10 新乡市振英机械设备有限公司 Screen cloth fixing structure for square swinging screen
WO2020225091A1 (en) * 2019-05-06 2020-11-12 Hein, Lehmann Gmbh Flip-flop screening machine
CN112638550A (en) * 2019-05-06 2021-04-09 海因莱曼有限公司 Tension-relaxation type screening machine
US20220048074A1 (en) * 2019-05-06 2022-02-17 Hein, Lehmann Gmbh Flip-flop screening machine
JP2022532000A (en) * 2019-05-06 2022-07-13 ハイン、レーマン ゲーエムベーハー Flip flow screen machine
US11453033B2 (en) 2019-05-06 2022-09-27 Hein, Lehmann Gmbh Flip-flop screening machine
CN112638550B (en) * 2019-05-06 2023-09-05 海因莱曼有限公司 Relaxation type screening machine
CN110152990A (en) * 2019-06-13 2019-08-23 东北农业大学 A kind of ladder flexibility grain cleaning mechanism of imitative earthworm motion feature

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Publication number Publication date
EP0218575A3 (en) 1988-11-02
HUT45928A (en) 1988-09-28
HU197235B (en) 1989-03-28

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