EP0084878B1 - Sieving method and device for carrying it out - Google Patents

Sieving method and device for carrying it out Download PDF

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Publication number
EP0084878B1
EP0084878B1 EP83100575A EP83100575A EP0084878B1 EP 0084878 B1 EP0084878 B1 EP 0084878B1 EP 83100575 A EP83100575 A EP 83100575A EP 83100575 A EP83100575 A EP 83100575A EP 0084878 B1 EP0084878 B1 EP 0084878B1
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EP
European Patent Office
Prior art keywords
sieve
flat springs
sieving
cross bars
another
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EP83100575A
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German (de)
French (fr)
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EP0084878A2 (en
EP0084878A3 (en
Inventor
Fritz Sgaslik
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Paul & Co Metallgewebe- U Filterfabrik GmbH
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Paul & Co Metallgewebe- U Filterfabrik GmbH
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Priority to AT83100575T priority Critical patent/ATE41888T1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/42—Drive mechanisms, regulating or controlling devices, or balancing devices, specially adapted for 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
    • B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
    • B07B1/40—Resonant vibration 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
    • B07B1/4609—Constructional details of screens in general; Cleaning or heating of screens constructional details of screening surfaces or meshes

Definitions

  • the invention relates to a sieving method in which the vibrations imparted to the sieve box are directed essentially perpendicular to the sieve plane, and to a device for carrying out this method.
  • a screening process and such a device are already known for. B. is known from US-A-2 617 533.
  • the invention therefore relates to vibrating sieves in which the sieve frame and sieve together carry out the same type of vibrations, essentially free-floating sieves with drive by mass force or sieves with a limited stroke with crank or eccentric drive.
  • All of these drives in a horizontal or slightly inclined arrangement of the screen box, today preferably convey circular or elliptical vibrations.
  • the mass of the sieve frame vibrates against resilient elements with a predetermined spring constant, so that the natural frequency and the critical speed can be predetermined according to known rules (see, for example, LUEGER, volume 49, page 583).
  • the vibrating basic system i.e. H. the sieve box
  • can therefore other vibratory systems d. H. Excite resonators, the frequency of the resonance vibrations of the resonator being equal to the frequency of the natural vibrations of the basic system.
  • the resonator in the resonance case absorbs the energy which is required to compensate for its internal damping, i. that is, a more or less large part of the energy imparted to the basic system is absorbed by the resonator. Regardless of this absorption, the mechanical efficiency of the vibrating screens is significantly improved by using the resonance principle.
  • the sieve plate or the sieve fabric - they are referred to uniformly as sieve plate in this analysis - even if there is no real training i.S. of the terminus technicus “resonance sieve”, in the case of vibrating sieves, additional resonance vibrations are stimulated by the basic system, the amplitude of which decreases towards the clamping points of the floor in the sieve box, d. that is, the sieve tray becomes a resonator in these cases.
  • the sieve design must be carefully coordinated on a case-by-case basis with regard to the sieving task to be solved.
  • This index number has a lower limit of up to approximately 1.6, with Kv values of 3 to 3.5 generally being used in the case of a sharp screening of goods which are difficult to screen. Furthermore, restrictive conditions apply to moist or sticky, i.e. H. fine material exhibiting strong surface forces. According to the already cited literature, one helps here by heating the sieve covering and evaporation of the water, the sieve generally being used as electrical resistance. However, these methods are complex and, at least not with certainty alone lead to the removal or avoidance of sieve smearing.
  • the solution of the method according to the invention provides that the vibrations imparted to the sieve box below the sieve plane perpendicular to the oscillation plane and perpendicular to the direction of the screenings overflow and lying on supports fixed in the sieve box excite resonant vibrations, the effective amplitudes of which are directed essentially one-sided towards the sieve bottom, and that in addition to their vertically directed movement, the flat springs move horizontally back and forth within a predetermined traveling distance.
  • the material overlaps perpendicular to the direction of the sieve material force components that move the springs back and forth according to the selected travel distance, the length of which was recognized as sufficient within the scope of this development with 2% to 10% - based on the sieve width.
  • a sieving machine suitable for practicing the method provides that transverse bars arranged at a distance below the sieve bottom in the sieve frame perpendicular to the direction of the material overflow are provided as a support for essentially zigzag-shaped flat springs,
  • V-shaped legs of each flat spring are bent in their end regions by approximately 90 °, in this case leading across the cross bars, and
  • the length of the flat springs is somewhat shorter than the clear width of the screen frame and these are designed to be displaceable in the direction of the cross bars.
  • V-shaped legs of each flat spring engage in one another in their end regions and in this case three cross bars each rest two flat springs.
  • the legs of the flat springs which are directed towards each other, be brought into each other by a cross section running approximately parallel to the cross bars.
  • this training results in the avoidance of plug-in grain and, overall, practically the maintenance of the active starting surface, i. H. with the same output, a smaller sieve size is possible or, if the sieve size is maintained, a larger output is possible.
  • the area load is lower compared to the previous cleaning devices (e.g. tapping devices).
  • the sieve bottom 2 forming the sieve plane is arranged in a tensioned manner in the usual way.
  • 2 rods 3 are fastened below the sieve bottom at a distance from the underside of the sieve bottom 2 that takes into account the effective height of the resonance vibration amplitudes of the flat springs 4.
  • the cross bars 3 thus serve to support and guide the flat springs 4. These are designed essentially in a zigzag shape, in the case of this example the two leg ends of the spring wire directed towards one another being brought into each other by a connecting cross section.
  • the cross section can also be arcuate, provided that a more or less sharp kinking of the legs is not preferred to one another.
  • the sieve frame 1 is set by a circular or elliptical oscillation drive into the required oscillation movement 6 directed in the vertical plane to the drive, which in turn excite the flat springs 4 to the resonance oscillation 7.
  • the flat springs 4 are shorter than the cross bars 3 carrying them, so that, according to the difference between the light dimension between the frame parts of the screen frame 1 connected by cross bars 3 and the length of the flat springs 4, there is a traveling distance 8, over the length of which the flat springs 4 are driven Move the screening machine back and forth.
  • the cross bars 3 have a diameter of 10 mm and are at a distance of 36 mm arranged to each other (commercial drawn round steel).
  • the dimensioning information mentioned in this example is only a suggestion.

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  • Combined Means For Separation Of Solids (AREA)

Abstract

1. Sieving method wherein the oscillations imparted to the sieve box extend essentially vertically to the sieve plane, characterized in that these oscillations incite flat springs (4) arranged below the sieve plane vertically to the oscillation plane (6) and vertically to the direction of the sieving material overflow (5) on supports fixed within the sieve box to perform resonant modes (7) whose effective amplitudes extend essentially unilaterally of the sieve bottom (2) and that the flat springs (4) in addition to their vertically directed motion (7) travel to and for horizontally within a predetermined travelling space (8).

Description

Die Erfindung betrifft ein Siebverfahren, bei dem die dem Siebkasten vermittelten Schwingungen im wesentlichen senkrent zur Siebebene gerichtet sind, sowie eine Vorrichtung zur Ausübung dieses Verfahrens. Ein solches Siebverfahren und eine solche Vorrichtung sind schon z. B. aus der US-A-2 617 533 bekannt.The invention relates to a sieving method in which the vibrations imparted to the sieve box are directed essentially perpendicular to the sieve plane, and to a device for carrying out this method. Such a screening process and such a device are already known for. B. is known from US-A-2 617 533.

Die Erfindung bezieht sich also auf Schwingsiebe, bei denen Siebrahmen und Sieb gemeinsam gleichartige Schwingungen ausführen, wobei im wesentlichen freischwingende Siebe mit Antrieb durch Massenkraft oder auch Siebe mit begrenztem Hub mit Kurbel- oder Exzenterantrieb angesprochen werden.The invention therefore relates to vibrating sieves in which the sieve frame and sieve together carry out the same type of vibrations, essentially free-floating sieves with drive by mass force or sieves with a limited stroke with crank or eccentric drive.

Alle diese Antriebe vermitteln in horizontaler oder geringfügig geneigter Anordnung des Siebkastens heute vorzugsweise kreis- oder elipsenförmig gerichtete Schwingungen. Bei Resonanzbetrieb schwingt die Masse des Siebrahmens gegen federnde Elemente mit vorbestimmter Federkonstante, so daß die Eigenfrequenz und die kritische Drehzahl nach bekannten Regeln vorbestimmbar sind (vgl. z. B. LUEGER, Band 49, Seite 583).All of these drives, in a horizontal or slightly inclined arrangement of the screen box, today preferably convey circular or elliptical vibrations. In resonance mode, the mass of the sieve frame vibrates against resilient elements with a predetermined spring constant, so that the natural frequency and the critical speed can be predetermined according to known rules (see, for example, LUEGER, volume 49, page 583).

Mit anderen Worten, das schwingende Grundsystem, d. h. der Siebkasten, kann also weitere schwingfähige Systeme, d. h. Resonatoren, anregen, wobei die Frequenz der Resonanzschwingungen des Resonators gleich der Frequenz der Eigenschwingungen des Grundsystems ist.In other words, the vibrating basic system, i.e. H. the sieve box, can therefore other vibratory systems, d. H. Excite resonators, the frequency of the resonance vibrations of the resonator being equal to the frequency of the natural vibrations of the basic system.

Da der Vorgang letztlich nicht verlustlos sein kann, nimmt der Resonator im Resonanzfalle die Energie auf, die zur Kompensation seiner Eigendämpfung benötigt wird, d. h., ein mehr oder weniger gro8er Teil der dem Grundsystem vermittelten Energie wird durch den Resonator absorbiert. Unabhängig von dieser Absorption wird der mechanische Wirkungsgrad der Schwingsiebe durch Anwendung des Resonanzprinzipes erheblich verbessert.Since the process cannot ultimately be lossless, the resonator in the resonance case absorbs the energy which is required to compensate for its internal damping, i. that is, a more or less large part of the energy imparted to the basic system is absorbed by the resonator. Regardless of this absorption, the mechanical efficiency of the vibrating screens is significantly improved by using the resonance principle.

In diesem Zusammenhang ist festzuhalten, daß der Siebboden bzw. das Siebgewebe - sie werden bei dieser Betrachtung einheitlich als Siebboden angesprochen - auch bei nicht gegebener echter Ausbildung i.S. des Terminus technicus « Resonanzsieb •, bei Schwingsieben zu zusätzlichen Resonanzschwingungen durch das Grundsystem angeregt werden, deren Amplitude zu den Einspannstellen des Bodens im Siebkasten hin abnehmend ist, d. h., daß der Siebboden in diesen Fällen zu einem Resonator wird.In this context, it should be noted that the sieve plate or the sieve fabric - they are referred to uniformly as sieve plate in this analysis - even if there is no real training i.S. of the terminus technicus “resonance sieve”, in the case of vibrating sieves, additional resonance vibrations are stimulated by the basic system, the amplitude of which decreases towards the clamping points of the floor in the sieve box, d. that is, the sieve tray becomes a resonator in these cases.

Selbstverständlich versucht man durch optimale Siebspannung dieses quasi « Eigenverhalten des Siebbodens in vernünftigen Grenzen zu halten, da Siebleistung und Siebverhalten über den gesamten Boden weitgehend gleichmäßig sein sollen.Of course one tries to keep this quasi «behavior of the sieve bottom within reasonable limits by optimal sieve tension, since sieving performance and sieving behavior should be largely uniform over the entire bottom.

Auf jeden Fall muß eine fallweise sorgfältige Abstimmung der Siebkonzeption im Hinblick auf die zu lösende Siebaufgabe stattfinden.In any case, the sieve design must be carefully coordinated on a case-by-case basis with regard to the sieving task to be solved.

Es gibt zwar Siebe, denen ein relativ großer Anwendungsbereich zugeordnet sein kann, und die sich in der Praxis als Universalsiebe eingeführt haben. Doch auch die Möglichkeiten dieser Siebe sind letztlich begrenzt.There are sieves to which a relatively large area of application can be assigned, and which have been introduced in practice as universal sieves. But the possibilities of these screens are ultimately limited.

Dies gilt insbesondere für die Absiebung feinkörniger Stoffe unterhalb des 3 mm bzw. 2 mm Bereiches mit niedriger Siebkennziffer (Siebkennziffer Kv = vertikale Komponente der Siebbeschleunigung : Kv = bv/g)This applies in particular to the screening of fine-grained substances below the 3 mm or 2 mm range with a low sieving index (sieving index Kv = vertical component of the sieving acceleration: Kv = bv / g)

Diese Kennziffer ist nach unten etwa bis zu 1,6 begrenzt, wobei bei einer scharfen Absiebung schwer siebbaren Gutes im allgemeinen Kv-Werte von 3 bis 3,5 anzusetzen sind. Desweiteren gelten einschränkende Bedingungen für feuchtes bzw. klebriges, d. h. starke Oberflächenkräfte ausweisendes Feingut. Hier hilft man sich gemäß der bereits angezogenen Literaturstelle mit Erwärmung des Siebbelages und Verdampfung des Wassers, wobei das Sieb im allgemeinen als elektrischer Widerstand benützt wird. Diese Methoden sind jedoch aufwendig und sie führen zumindest nicht alleine mit Sicherheit zur Entfernung bzw. Vermeidung entstehender Siebverschmierungen.This index number has a lower limit of up to approximately 1.6, with Kv values of 3 to 3.5 generally being used in the case of a sharp screening of goods which are difficult to screen. Furthermore, restrictive conditions apply to moist or sticky, i.e. H. fine material exhibiting strong surface forces. According to the already cited literature, one helps here by heating the sieve covering and evaporation of the water, the sieve generally being used as electrical resistance. However, these methods are complex and, at least not with certainty alone lead to the removal or avoidance of sieve smearing.

Dies berücksichtigend ist es Aufgabe dieser Erfindung, ein Verfahren nach der eingangs beschriebenen Art zu nennen, das auf mechanischem Weg den Siebdurchgang für feuchtes oder zu starker Haftung neigendes Feingut durch kontinuierlichen Abbau der Siebverschmierungen wesentlich verbessert. wobei diese Verbesserung auch die Siebwilligkeit bei niedriger Kv -Zahl fördern soll.Taking this into account, it is the object of this invention to name a method of the type described at the outset, which mechanically significantly improves the sieve passage for fine or fine material which tends to become strongly liable by continuously reducing the sieve smearings. this improvement should also promote willingness to sieve at low Kv numbers.

Desweiteren wird eine Vorrichtung zur Ausübung dieses Verfahrens vorgeschlagen.Furthermore, an apparatus for performing this method is proposed.

Die erfindungsgemäße Lösung des Verfahrens sieht vor, daß die dem Siebkasten vermittelten Schwingungen unterhalb der Siebebene senkrecht zur Schwingungsebene und senkrecht zur Richtung des Siebgutüberlaufes angeordnete, auf im Siebkasten befestigten Auflagen liegende Flachfedern zu Resonanzschwingungen anregen, deren wirksame Amplituden im wesentlichen einseitig zum Siebboden gerichtet sind, und daß die Flachfedern zusätzlich zu ihrer vertikal gerichteten Bewegung innerhalb eines vorbestimmten Wanderabstandes horizontal hin- und herwandern.The solution of the method according to the invention provides that the vibrations imparted to the sieve box below the sieve plane perpendicular to the oscillation plane and perpendicular to the direction of the screenings overflow and lying on supports fixed in the sieve box excite resonant vibrations, the effective amplitudes of which are directed essentially one-sided towards the sieve bottom, and that in addition to their vertically directed movement, the flat springs move horizontally back and forth within a predetermined traveling distance.

Die Anregung von unterhalb des Siebbodens mit Abstand zu diesem angeordneten Flachfedern zu senkrecht gegen dessen Ebene gerichteten Schwingungen führt zu einer entsprechend der Frequenz des Systems erfolgenden Stoßbeaufschlagung des Siebbodens von unten.The excitation from below the sieve plate at a distance from this flat springs to vibrations directed vertically against its plane leads to an impact on the sieve plate from below which occurs according to the frequency of the system.

Diese verhindert oder reduziert zumindest im wesentlichen Umfang die Tendenz des Gutes zur Bildung von Verschmierungen und zu Anhaftungen in den Siebdurchgängen.This prevents or at least substantially reduces the tendency of the material to form smudges and to build up in the sieve passages.

Aufgrund der Eigenschwingung des Siebbodens und der von einem mittleren Bereich des Bodens ausgehenden Verringerung der Amplitudenhöhe zu den Einspannrändern hin, stellen sich senkrecht zur Richtung des Siebgutüberlaufes hin gerichtete Kraftkomponenten ein, durch die die Federn entsprechend dem gewählten Wanderabstand, dessen Länge im Rahmen dieser Entwicklung mit 2 % bis 10 % - bezogen auf die Siebbreite - als ausreichend erkannt wurde, hinund herbewegt werden.Due to the natural vibration of the sieve plate and the reduction in the amplitude height from a central area of the plate towards the clamping edges, the material overlaps perpendicular to the direction of the sieve material force components that move the springs back and forth according to the selected travel distance, the length of which was recognized as sufficient within the scope of this development with 2% to 10% - based on the sieve width.

Ob und inwieweit bei dieser hin- und hergehenden Querbewegung das eigene Federverhalten dieser Auflägefedern mit die jeweiligen Richtungsumkehrung bestimmt, konnte bis jetzt noch nicht endgültig belegt werden ; die Annahme eines Zusammenhanges erscheint jedoch wahrscheinlich und gerechtfertigt.It has not yet been possible to conclusively determine whether and to what extent this own reciprocating movement determines the spring behavior of these support springs with the respective reversal of direction. however, the assumption of a connection seems probable and justified.

Eine zur Ausübung des Verfahrens geeignete Siebmaschine sieht vor, daß im Siebrahmen senkrecht zur Richtung des Siebgutüberlaufes, unterhalb des Siebbodens mit Abstand angeordnete Querstäbe als Auflage für im wesentlichen Zickzack geformte Flachfedern vorgesehen sind,A sieving machine suitable for practicing the method provides that transverse bars arranged at a distance below the sieve bottom in the sieve frame perpendicular to the direction of the material overflow are provided as a support for essentially zigzag-shaped flat springs,

daß die V-förmig zusammengeführten Schenkel jeder Flachfeder in ihren Endbereichen um ca. 90°, hierbei führend über die Querstäbe greifend, abgebogen sind, undthat the V-shaped legs of each flat spring are bent in their end regions by approximately 90 °, in this case leading across the cross bars, and

daß die Länge der Flachfedern etwas kürzer als die lichte Breite des Siebrahmens ist und diese in Richtung der Querstäbe verschiebbar ausgebildet sind.that the length of the flat springs is somewhat shorter than the clear width of the screen frame and these are designed to be displaceable in the direction of the cross bars.

Die Abbiegung der V-förmig zusammengeführten Schenkel der Flachfedern um etwa 90° ermöglicht deren einfache Führung auf den Querstäben, wobei selbstverständlich zwischen dem Außenabstand zweier Stäbe und der übergreifenden Feder ein die freie Bewegung der Federn ermöglichendes Spiel zu berücksichtigen ist.The bending of the V-shaped legs of the flat springs by approximately 90 ° enables them to be easily guided on the crossbars, whereby, of course, a clearance allowing the springs to move freely must be taken into account between the outer distance between two bars and the overlapping spring.

Zum weiteren Aufbau der Siebmaschine wird vorgeschlagen, daß die V-förmig zusammengeführten Schenkel jeder Flachfeder in ihren Endbereichen ineinander greifen und hierbei jeweils drei Querstäbe zwei Flachfedern aufliegen.For the further construction of the screening machine, it is proposed that the V-shaped legs of each flat spring engage in one another in their end regions and in this case three cross bars each rest two flat springs.

Diese Anordnung der Flachfedern ermöglicht deren praktisch lückenlose, gleichmäßige Verteilung über die untere Fläche des Siebbodens.This arrangement of the flat springs enables their practically complete, even distribution over the lower surface of the sieve plate.

Zur Federausbildung wird vorgeschlagen, da8 die jeweils zueinander gerichteten Schenkel der Flachfedern durch einen etwa parallel zu den Querstäben verlaufenden Querabschnitt ineinander überführen.For spring formation, it is proposed that the legs of the flat springs, which are directed towards each other, be brought into each other by a cross section running approximately parallel to the cross bars.

Selbstverständlich ist es auch möglich, die Federn so auszubilden, daß die jeweils zueinander gerichteten Schenkel der Flachfedern durch einen bogenförmig ausgebildeten Querabschnitt ineinander überführen. Auch jede andere geformte Windungsumlenkung, z. B. eine spitzförmige, ist praktikabel und möglich.Of course, it is also possible to design the springs in such a way that the legs of the flat springs, which are directed towards one another, are brought into one another by an arcuate cross section. Any other shaped turn deflection, e.g. B. a pointed, is practical and possible.

Desweiteren resultiert aus dieser Ausbildung eine Vermeidung von Steckkorn und insgesamt betrachtet, praktisch die Erhaltung der aktiven Ausgangsoberfläche, d. h. bei gleicher Leistung ist eine kleinere Siebgröße möglich bzw. bei Aufrechterhaltung der Siebgröße, eine größere Leistung möglich.Furthermore, this training results in the avoidance of plug-in grain and, overall, practically the maintenance of the active starting surface, i. H. with the same output, a smaller sieve size is possible or, if the sieve size is maintained, a larger output is possible.

Die Flächenbelastung ist geringer im Vergleich zu den bisherigen Reinigungsvorrichtungen (z. B. Klopfvorrichtungen).The area load is lower compared to the previous cleaning devices (e.g. tapping devices).

Auch die manuelle Reinigung des Siebes entfällt in aller Regel.Manual cleaning of the sieve is usually not necessary.

Die Erfindung wird durch die beigefügte zeichnerische Darstellung einer beispielsweisen Ausführung näher erläutert.

  • Figur 1 zeigt eine perspektivische Darstellung des Siebkastens, wobei ein Ausschnitt aus dem Siebboden die Anordnung der Flachfedern erkennen läßt. Desweiteren ist die Schwingebene (Kreis- oder Elipsenschwinger) und die Richtung des Siebgutüberlaufes durch Pfeile dargestellt.
  • Figur 2 zeigt einen Teilausschnitt aus Figur 1, wobei die Anordnung und die Formgebung der Flachfedern vergrößert dargestellt sind und die Richtung der den Flachfedern vermittelten Resonanzschwingungen sowie die senkrecht zu diesen verlaufenden, hinund hergehenden Wanderbewegungen dieser Federn durch Pfeile ausgewiesen sind.
  • Figur 3 zeigt eine Draufsicht in Richtung 11/11 gemäß Figur 4 auf den Siebkasten.
  • Figur 4 zeigt den Schnitt I/I aus Figur 3 bei stillstehender Siebmaschine.
  • Figur 5 zeigt den Schnitt I/I aus Figur 3 bei angetriebener Siebmaschine.
The invention is explained in more detail by the attached drawing of an exemplary embodiment.
  • Figure 1 shows a perspective view of the screen box, a section of the screen bottom showing the arrangement of the flat springs. Furthermore, the vibration level (circular or elliptical vibrator) and the direction of the screenings overflow is shown by arrows.
  • Figure 2 shows a partial section of Figure 1, the arrangement and shape of the flat springs are shown enlarged and the direction of the resonance vibrations imparted to the flat springs and the perpendicular to these reciprocating movements of these springs are indicated by arrows.
  • Figure 3 shows a plan view in the direction 11/11 of Figure 4 on the screen box.
  • FIG. 4 shows the section I / I from FIG. 3 with the screening machine at a standstill.
  • FIG. 5 shows the section I / I from FIG. 3 with a driven screening machine.

Im Siebrahmen 1 ist der die Siebebene bildende Siebboden 2 in üblicher Weise gespannt angeordnet. Zwischen den in Richtung des Siebgutüberlaufes 5 weisenden Rahmenteilen des Siebrahmens 1 sind unterhalb des Siebbodens 2 Stäbe 3 in einem die wirksame Höhe der Resonanzschwingungsamplituden der Flachfedern 4 berücksichtigenden Abstand zur Unterseite des Siebbodens 2 befestigt. Die Querstäbe 3 dienen damit zur Auflage und Führung der Flachfedern 4. Diese sind im wesentlichen Zickzack-förmig ausgebildet, wobei im Falle dieses Beispieles jeweils die beiden zueinander gerichteten Schenkelenden des Federdrahtes durch einen verbindenden Querabschnitt ineinander überführen.In the sieve frame 1, the sieve bottom 2 forming the sieve plane is arranged in a tensioned manner in the usual way. Between the frame parts of the sieve frame 1 pointing in the direction of the sieve overflow 5, 2 rods 3 are fastened below the sieve bottom at a distance from the underside of the sieve bottom 2 that takes into account the effective height of the resonance vibration amplitudes of the flat springs 4. The cross bars 3 thus serve to support and guide the flat springs 4. These are designed essentially in a zigzag shape, in the case of this example the two leg ends of the spring wire directed towards one another being brought into each other by a connecting cross section.

Der Querabschnitt kann auch bogenförmig ausgebildet sein, sofern nichteine mehr oder weniger scharfe Knickformung der Schenkel zueinander vorgezogen wird.The cross section can also be arcuate, provided that a more or less sharp kinking of the legs is not preferred to one another.

Der Siebrahmen 1 wird durch einen Kreis- bzw. Elipsenschwingantrieb in die erforderliche, in senkrechter Ebene zum Antrieb gerichtete Schwingbewegung 6 versetzt, die ihrerseits die Flachfedern 4 zur Resonanzschwingung 7 anregen.The sieve frame 1 is set by a circular or elliptical oscillation drive into the required oscillation movement 6 directed in the vertical plane to the drive, which in turn excite the flat springs 4 to the resonance oscillation 7.

Die Flachfedern 4 sind kürzer als die sie tragenden Querstäbe 3, so daß entsprechend der Differenz aus dem Lichtmaß zwischen den durch Querstäbe 3 verbundenen Rahmenteilen des Siebrahmens 1 und der Länge der Flachfedern 4 sich ein Wanderabstand 8 ergibt, über dessen Länge die Flachfedern 4 bei angetriebener Siebmaschine hin- und herwandern.The flat springs 4 are shorter than the cross bars 3 carrying them, so that, according to the difference between the light dimension between the frame parts of the screen frame 1 connected by cross bars 3 and the length of the flat springs 4, there is a traveling distance 8, over the length of which the flat springs 4 are driven Move the screening machine back and forth.

Im Rahmen dieses Beispiels wird ein Sieb mit einer lichten Weite von 370 mm, eine Länge der Federn 4 von 358 mm bei einer Drahtstärke von 1,5 mm und einem Schenkelwinkel von jeweils 5° senkrecht zur Längsrichtung der Federn angenommen.In the context of this example, a sieve with a clear width of 370 mm, a length of the springs 4 of 358 mm with a wire thickness of 1.5 mm and a leg angle of 5 ° in each case perpendicular to the longitudinal direction of the springs is assumed.

Die Querstäbe 3 weisen einen Durchmesser von 10 mm auf und sind im Abstand von 36 mm zueinander angeordnet (handelsüblicher gezogener Rundstahl).The cross bars 3 have a diameter of 10 mm and are at a distance of 36 mm arranged to each other (commercial drawn round steel).

Es handelt sich bei den in diesem Beispiel erwähnten Dimensionierungsangaben lediglich um einen Vorschlag.The dimensioning information mentioned in this example is only a suggestion.

Claims (5)

1. Sieving method wherein the oscillations imparted to the sieve box extend essentially vertically to the sieve plane, characterized in that these oscillations incite flat springs (4) arranged below the sieve plane vertically to the oscillation plane (6) and vertically to the direction of the sieving material overflow (5) on supports fixed within the sieve box to perform resonant modes (7) whose effective amplitudes extend essentially unilaterally of the sieve bottom (2) and that the flat springs (4) in addition to their vertically directed motion (7) travel to and for horizontally within a predetermined travelling space (8).
2. Sieving device for carrying out the method according to claim 1, characterized in that within the sieve frame (1) vertically to the direction of the sieving material overflow (5) cross bars (3) spaced from one another are provided below the sieve box (2) as supports for flat springs (4) of essentially zigzag shape, that the legs joined in V-manner of each flat spring (4) are bent off in their end portions by about 90°, grasping the cross bars (3) as guides, and that the length of the flat springs (4), which are formed so as to be displaceable in the direction of the cross bars (3), is slightly shorter than the inner width of the sieve frame (1).
3. Sieving device according to claim 2, characterized in that the legs joined in V-manner of each flat spring (4) in their end portions inter-engage, two flat springs (4) each resting on three cross bars (3).
4. Sieving device according to claims 2 and 3, characterized in that the legs directed towards one another of the flat springs (4) lead over into one another by a transverse portion extending about parallelly to the cross bars (3).
5. Sieving device according to claims 2 and 3, characterized in that the legs directed towards one another of the flat springs (4) lead over into one another by a bow-shaped transverse portion.
EP83100575A 1982-01-27 1983-01-22 Sieving method and device for carrying it out Expired EP0084878B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83100575T ATE41888T1 (en) 1982-01-27 1983-01-22 METHOD OF SCREENING AND DEVICE FOR EXERCISING.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3202528 1982-01-27
DE19823202528 DE3202528A1 (en) 1982-01-27 1982-01-27 SCREENING METHOD AND DEVICE FOR EXERCISING

Publications (3)

Publication Number Publication Date
EP0084878A2 EP0084878A2 (en) 1983-08-03
EP0084878A3 EP0084878A3 (en) 1986-03-26
EP0084878B1 true EP0084878B1 (en) 1989-04-05

Family

ID=6154004

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83100575A Expired EP0084878B1 (en) 1982-01-27 1983-01-22 Sieving method and device for carrying it out

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Country Link
EP (1) EP0084878B1 (en)
AT (1) ATE41888T1 (en)
DE (1) DE3202528A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113058361B (en) * 2021-04-08 2022-06-17 杭州意能电力技术有限公司 Variable-frequency high-strength airflow sound source and using method thereof
CN113289887A (en) * 2021-07-06 2021-08-24 西南石油大学 Anti-resonance high-efficiency vibration isolation linear vibrating screen

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR427986A (en) * 1911-03-31 1911-08-19 Societe Daverio Henrici & Cie S A Shaker sieve mixer
US2617533A (en) * 1948-12-17 1952-11-11 Lehman Vibrating equipment
US3070230A (en) * 1958-12-12 1962-12-25 Lottie J Peterson Apparatus for separating materials
US3565251A (en) * 1968-12-30 1971-02-23 Blaw Knox Co Plastic internal screen
DE2609683A1 (en) * 1976-03-09 1977-09-15 Juergen Hoffmann Sieve unit using leaf springs - with impact length smaller than active sieve width
US4122006A (en) * 1977-09-28 1978-10-24 Black Clawson, Inc. Screening apparatus

Also Published As

Publication number Publication date
DE3202528C2 (en) 1990-09-20
EP0084878A2 (en) 1983-08-03
DE3202528A1 (en) 1983-08-04
ATE41888T1 (en) 1989-04-15
EP0084878A3 (en) 1986-03-26

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