EP1062057A1 - Method for activating a sieve frame with ultrasounds - Google Patents

Method for activating a sieve frame with ultrasounds

Info

Publication number
EP1062057A1
EP1062057A1 EP99915549A EP99915549A EP1062057A1 EP 1062057 A1 EP1062057 A1 EP 1062057A1 EP 99915549 A EP99915549 A EP 99915549A EP 99915549 A EP99915549 A EP 99915549A EP 1062057 A1 EP1062057 A1 EP 1062057A1
Authority
EP
European Patent Office
Prior art keywords
sieve frame
screen
screen frame
sieve
frame
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP99915549A
Other languages
German (de)
French (fr)
Other versions
EP1062057B1 (en
Inventor
Harald Hielscher
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.)
Dr Hielscher GmbH
Original Assignee
Dr Hielscher GmbH
Dr Hielscher GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Dr Hielscher GmbH, Dr Hielscher GmbH filed Critical Dr Hielscher GmbH
Publication of EP1062057A1 publication Critical patent/EP1062057A1/en
Application granted granted Critical
Publication of EP1062057B1 publication Critical patent/EP1062057B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
    • B07B1/50—Cleaning
    • B07B1/54—Cleaning with beating devices

Definitions

  • the invention relates to a method for exciting a screen frame with ultrasound according to the preamble of claim 1.
  • the known ultrasonic screening devices and screening processes consist essentially of a screen frame with an applied screen surface and an ultrasound source coupled to the screen frame via an ultrasound transducer, the transducer converting the high-frequency electrical vibrations into mechanical bending vibrations.
  • WO 94/27748 describes a device and a method for sieving, classifying, sifting, filtering or sorting substances with a sieve surface provided in a sieve frame and associated ultrasonic transducer, by means of which vibrations can be fed to the sieve surface.
  • the ultrasound transducer is assigned a resonator which is in contact with the sieve surface and which is matched to the resonance of the ultrasound transducer and can be set into bending vibrations by the latter.
  • the longitudinal vibrations generated by the sound transducer are converted into bending vibrations of the same frequency in the resonator bars arranged tangentially to the longitudinal direction of vibration.
  • a disadvantage of all known embodiments is that the large dimensions resulting from the "bending oscillator" principle of oscillation do not allow a sufficiently compact design of the screening device.
  • the object of the invention is to develop a method for exciting screen frames by means of ultrasound, with which a more compact design of screening devices than previously known is ensured.
  • the excitation of a sieve frame with ultrasound as a longitudinal oscillator ensures a flatter and thus more compact construction of sieve frames than sieve devices excited according to the bending oscillator principle.
  • the vibrating system to the element to be excited with the vibrations (for example screen frame) with a lateral offset, a compact design can be achieved in that the vibrating system is arranged under the screen frame.
  • ring shapes also elliptical shapes
  • the screen frame in particular if the excitation axis of the vibrating system is shifted into the plane of the screen frame transmitting the vibrations by means of a coupling element.
  • FIG. Shows a schematic representation of the ring-shaped screen frame with the ultrasound source.
  • a circular screen frame 1 is formed from an integer multiple of ⁇ / 2 elements, one of the ⁇ / 2 elements being formed by a coupling element 2.
  • the coupling element 2 consists of two ⁇ / 2 longitudinal oscillators 3, which are interconnected in their maximum amplitude.
  • An ultrasound generating system 4 (ultrasound transducer) is as a ⁇ / 2 longitudinal oscillator on the lower ⁇ / 2 longitudinal oscillator 3 of the coupling element
  • the high-frequency mechanical longitudinal vibrations generated by the ultrasonic transducer 4 are transmitted via the coupling Transfer element 2 to a sieve frame 1, propagate over the entire circumference according to diagram II of the figure and are evenly transmitted to the sieve fabric (not shown).
  • Diagram I of the figure shows the course of oscillation in transducer 4 and in coupling element 2.
  • Diagram II shows the course of oscillation in sieve frame 1, the amplitude quantity a being plotted over the location of vibration x in both diagrams 1, 11 of the figure. There is a vibration node at location x 0 .
  • a sieve applied to the sieve frame 1 is set into lateral movements which largely correspond to the sieve movements during manual sieving.
  • the excitation of the screening surface is offset by 90 °.

Abstract

The invention concerns a method for activating a sieve frame with ultrasounds. The invention aims at developing a method for activating a sieve frame with ultrasounds, which enables the use of sieving devices with more compact structure than current known ones. Said aim is achieved by the fact that the sieve frame is activated as longitudinal oscillator. The sieve frame (1) is activated in particular via a coupling element (2) which offsets the oscillating system (4) activation axis (5) in the sieve frame (1) plane transmitting the oscillations.

Description

Verfahren zum Anregen eines Siebrahmens mit UltraschallUltrasonic excitation method for a sieve frame
Beschreibungdescription
Die Erfindung betrifft ein Verfahren zum Anregen eines Siebrahmens mit Ultraschall gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a method for exciting a screen frame with ultrasound according to the preamble of claim 1.
Es ist allgemein bekannt, zum Sieben unterschiedlichster Güter Ultraschall zu verwenden. Die durch den Ultraschall erzeugten schwingenden Bewegungen werden auf die Siebfläche übertragen und üben einen günstigen Einfluß auf den Siebdurchsatz und das Siebgut aus . Die auf das Siebgut übertragenen Schwingungen bewirken eine Reduzierung der Oberflächenspannung und der Aglomerierungskräfte, so daß ein Verstopfen der Siebmaschen weitestgehend verhindert wird.It is generally known to use ultrasound to screen a wide variety of goods. The oscillating movements generated by the ultrasound are transmitted to the screen surface and exert a favorable influence on the screen throughput and the screenings. The vibrations transmitted to the screenings reduce the surface tension and the agglomeration forces, so that clogging of the screen mesh is largely prevented.
Die bekannten Ultraschall verwendenden Siebvorrichtungen und Siebverfahren bestehen im wesentlichen aus einem Siebrahmen mit einer aufgebrachten Siebfläche und einer an den Siebrahmen über einen Ultraschallwandler angekoppelten Ultraschallquelle, wobei der Wandler die hochfrequenten elektrischen Schwingungen in mechanische Biegeschwingungen umwandelt . In der WO 94/27748 werden eine Vorrichtung und ein Verfahren zum Sieben, Klassieren, Sichten, Filtern oder Sortieren von Stoffen mit in einem Siebrahmen vorgesehener Siebfläche und dieser zugeordnetem Ultraschall-Wandler, durch den der Siebfläche Schwingungen zuleitbar sind, beschrieben.The known ultrasonic screening devices and screening processes consist essentially of a screen frame with an applied screen surface and an ultrasound source coupled to the screen frame via an ultrasound transducer, the transducer converting the high-frequency electrical vibrations into mechanical bending vibrations. WO 94/27748 describes a device and a method for sieving, classifying, sifting, filtering or sorting substances with a sieve surface provided in a sieve frame and associated ultrasonic transducer, by means of which vibrations can be fed to the sieve surface.
Dem Ultraschallwandler ist ein der Siebfläche anliegender Resonator zugeordnet, der auf die Resonanz des Ultraschallwandlers abgestimmt und von letzterem in BiegeSchwingungen versetzbar ist. Die vom Schallwandler erzeugten LongitudinalSchwingungen werden in den tangential zur longitudinalen Schwingrichtung angeordneten Resonatorstäben in Biegeschwingungen der gleichen Frequenz umgeformt.The ultrasound transducer is assigned a resonator which is in contact with the sieve surface and which is matched to the resonance of the ultrasound transducer and can be set into bending vibrations by the latter. The longitudinal vibrations generated by the sound transducer are converted into bending vibrations of the same frequency in the resonator bars arranged tangentially to the longitudinal direction of vibration.
Nachteilig ist bei allen bekannten Ausführungsformen, daß die aus dem Anschwingungsprinzip „Biegeschwinger" sich ergebenden großen Abmessungen keine ausreichend kompakte Bauform der Siebvorrichtung ermöglichen.A disadvantage of all known embodiments is that the large dimensions resulting from the "bending oscillator" principle of oscillation do not allow a sufficiently compact design of the screening device.
Aufgabe der Erfindung ist es, ein Verfahren zum Anregen von Siebrahmen mittels Ultraschall zu entwickeln, mit welchem eine kompaktere Bauart von Siebvorrichtungen als bisher bekannt gewährleistet wird.The object of the invention is to develop a method for exciting screen frames by means of ultrasound, with which a more compact design of screening devices than previously known is ensured.
Die Lösung dieser Aufgabe ergibt sich aus den Merkmalen des Anspruchs 1. Zweckmäßige Ausgestaltungen der Erfindung sind in den Unteransprüchen angegeben.The solution to this problem results from the features of claim 1. Appropriate embodiments of the invention are specified in the subclaims.
Die Anregung eines Siebrahmens mit Ultraschall als Längsschwinger gewährleistet eine flachere und damit kompaktere Bauart von Siebrahmen als nach dem Biegeschwingerprinzip angeregte Siebvorrichtungen. Insbesondere durch die Anbringung des schwingenden Systems an das mit den Schwingungen anzuregende Element (zum Beispiel Siebrahmen) mit einem seitlichen Versatz kann eine kompakte Bauform dadurch erreicht werden, daß das schwingende System unter dem Siebrahmen angeordnet wird. Es ist des weiteren die Ausbildung von Ringformen (auch elliptische Formen) für den Siebrahmen möglich, insbesondere wenn durch ein Koppelelement die Anregungsachse des schwingenden Systems in die Ebene des die Schwingungen übertragenden Siebrahmens verlagert wird.The excitation of a sieve frame with ultrasound as a longitudinal oscillator ensures a flatter and thus more compact construction of sieve frames than sieve devices excited according to the bending oscillator principle. In particular by attaching the vibrating system to the element to be excited with the vibrations (for example screen frame) with a lateral offset, a compact design can be achieved in that the vibrating system is arranged under the screen frame. It is also possible to form ring shapes (also elliptical shapes) for the screen frame, in particular if the excitation axis of the vibrating system is shifted into the plane of the screen frame transmitting the vibrations by means of a coupling element.
Die Erfindung wird nachfolgend in einem Ausführungsbei- spiel eines ringförmigen Siebrahmens näher erläutert. In der einzigen Fig. ist in einer schematischen Darstellung der ringförmige Siebrahmen mit der Ultraschall-Quelle dargestellt.The invention is explained in more detail below in an exemplary embodiment of an annular sieve frame. The single FIG. Shows a schematic representation of the ring-shaped screen frame with the ultrasound source.
Entsprechend der Darstellung in der Fig. ist ein kreis- förmiger Siebrahmen 1 aus einem ganzzahligen Vielfachen von λ /2-Elementen gebildet, wobei eines der λ /2- Elemente durch ein Koppelelement 2 gebildet ist .As shown in the figure, a circular screen frame 1 is formed from an integer multiple of λ / 2 elements, one of the λ / 2 elements being formed by a coupling element 2.
Das Koppelelement 2 besteht aus zwei λ /2-Längsschwin- gern 3, die in ihrem Amplitudenmaximum miteinander verbunden sind.The coupling element 2 consists of two λ / 2 longitudinal oscillators 3, which are interconnected in their maximum amplitude.
Ein den Ultraschall erzeugendes schwingendes System 4 (Ultraschall-Wandler) ist als λ /2-Längsschwinger an dem unteren λ /2-Längsschwinger 3 des KoppelelementesAn ultrasound generating system 4 (ultrasound transducer) is as a λ / 2 longitudinal oscillator on the lower λ / 2 longitudinal oscillator 3 of the coupling element
2 angebracht .2 attached.
Die vom Ultraschall-Wandler 4 erzeugten hochfrequenten mechanischen Längs-Schwingungen werden über das Koppe- lelement 2 auf einen Siebrahmen 1 übertragen, pflanzen sich über den gesamten Umfang entsprechend dem Diagramm II der Figur fort und werden gleichmäßig auf das Siebgewebe (nicht dargestellt) übertragen.The high-frequency mechanical longitudinal vibrations generated by the ultrasonic transducer 4 are transmitted via the coupling Transfer element 2 to a sieve frame 1, propagate over the entire circumference according to diagram II of the figure and are evenly transmitted to the sieve fabric (not shown).
Bei großen Siebflächen kann es zweckmäßig sein, mehrere, in Abhängigkeit von der Geometrie der Siebfläche, kreisförmige, elliptische oder stabförmige Siebrahmen 1 unter der Siebfläche anzuordnen, um eine effektive Siebfunktion zu gewährleisten.In the case of large screen areas, it may be expedient to arrange a plurality of circular, elliptical or rod-shaped screen frames 1, depending on the geometry of the screen area, under the screen area in order to ensure an effective screen function.
Das Diagramm I der Figur zeigt den Schwingungsverlauf im Wandler 4 sowie im Koppelelement 2. Das Diagramm II zeigt den Schwingungsverlauf im Siebrahmen 1, wobei in beiden Diagrammen 1,11 der Figur die Amplitudengröße a über den Schwingungsort x aufgetragen wurde . Am Ort x0 befindet sich jeweils ein Schwingungsknoten.Diagram I of the figure shows the course of oscillation in transducer 4 and in coupling element 2. Diagram II shows the course of oscillation in sieve frame 1, the amplitude quantity a being plotted over the location of vibration x in both diagrams 1, 11 of the figure. There is a vibration node at location x 0 .
Durch die LängsSchwingungen des Systems 4 wird ein auf den Siebrahmen 1 aufgebrachtes Sieb in seitliche Bewegungen versetzt, die weitgehend den Siebbewegungen beim manuellen Sieben entsprechen. Gegenüber den bekannten Siebvorrichtungen nach dem Stand der Technik erfolgt die Anregung der Siebfläche um 90° versetzt.Due to the longitudinal vibrations of the system 4, a sieve applied to the sieve frame 1 is set into lateral movements which largely correspond to the sieve movements during manual sieving. Compared to the known screening devices according to the prior art, the excitation of the screening surface is offset by 90 °.
Die Erfindung ist nicht auf die hier beschriebenen Aus- führungsformen beschränkt. Vielmehr ist es möglich, durch Kombination der Merkmale weitere Ausführungsbei- spiele zu realisieren, ohne den Rahmen der Erfindung zu verlassen. So ist es auch mit Vorteil denkbar, eine Längsschwinger-Bewegung nach der Erfindung mit einer Biegeschwinger-Bewegung bekannter Art an einem Siebrahmen zu kombinieren. BezugszeichenlisteThe invention is not restricted to the embodiments described here. Rather, it is possible to implement further exemplary embodiments by combining the features without leaving the scope of the invention. Thus, it is also advantageously conceivable to combine a longitudinal oscillator movement according to the invention with a known type of flexible oscillator movement on a sieve frame. Reference list
1 mit Schwingungen anzuregendes System (Siebrahmen)1 system to be vibrated (sieve frame)
2 Koppelelement2 coupling element
3 λ /2 -Längsschwinger3 λ / 2 longitudinal transducers
4 schwingendes System4 vibrating system
5 Anregungsachse von 45 excitation axis of 4
6 Ebene6 level
a Amplitudea amplitude
x Ortx location
Ort place

Claims

Patentansprüche claims
1. Verfahren zum Anregen eines Siebrahmens mit Ultraschall, dadurch gekennzeichnet, daß der Siebrahmen (1) als Längsschwinger angeregt wird.1. A method for exciting a screen frame with ultrasound, characterized in that the screen frame (1) is excited as a longitudinal oscillator.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, daß der Siebrahmen (1) über ein Koppelelement (2) angeregt wird, welches die Anregungsachse (5) des schwingenden Systems (4) in die Ebene (6) des die Schwingungen übertragenden Siebrahmens (1) verlagert .2. The method according to claim 1, characterized in that the screen frame (1) is excited via a coupling element (2) which the excitation axis (5) of the vibrating system (4) in the plane (6) of the vibrating screen frame (1 ) shifted.
3. Verfahren nach Anspruch 2 , dadurch gekennzeichnet, daß das Koppelelement (2) aus mindestens zwei in ihrem Amplitudenmaximum gekoppelten Längsschwingern (3) gebildet wird.3. The method according to claim 2, characterized in that the coupling element (2) is formed from at least two longitudinal oscillators (3) coupled in their amplitude maximum.
4. Verfahren nach den Ansprüchen 1 bis 3, dadurch gekennzeichnet, daß der die Schwingungen übertragende Siebrahmen (1) aus einem geradzahligen Vielfachen von λ /2-Elementen ringförmig gebildet wird, wobei durch das Koppelelement (2) bereits eines der λ /2 -Elemente gebildet ist.4. The method according to claims 1 to 3, characterized in that the vibrating screen frame (1) is formed in a ring from an even multiple of λ / 2 elements, with the coupling element (2) already one of the λ / 2 - Elements is formed.
Verfahren nach den Ansprüchen 1 bis 3, dadurch gekennzeichnet, daß der die Schwingungen übertragende Siebrahmen (1) stabförmig ausgebildet ist. Verfahren nach den Ansprüchen 1 bis 5, dadurch gekennzeichnet, daß mehrere ringförmige, elliptische und/oder stabformige, die Schwingungen übertragende Siebrahmen (1) unter einem Sieb (1) angeordnet werden. Method according to claims 1 to 3, characterized in that the screen frame (1) which transmits the vibrations is rod-shaped. Process according to claims 1 to 5, characterized in that a plurality of annular, elliptical and / or rod-shaped screen frames (1) which transmit the vibrations are arranged under a screen (1).
EP99915549A 1998-03-11 1999-03-09 Method for activating a sieve frame with ultrasounds Expired - Lifetime EP1062057B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19811266 1998-03-11
DE19811266A DE19811266C1 (en) 1998-03-11 1998-03-11 Method of cleaning filter frames
PCT/EP1999/001494 WO1999046061A1 (en) 1998-03-11 1999-03-09 Method for activating a sieve frame with ultrasounds

Publications (2)

Publication Number Publication Date
EP1062057A1 true EP1062057A1 (en) 2000-12-27
EP1062057B1 EP1062057B1 (en) 2002-06-19

Family

ID=7861004

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99915549A Expired - Lifetime EP1062057B1 (en) 1998-03-11 1999-03-09 Method for activating a sieve frame with ultrasounds

Country Status (6)

Country Link
EP (1) EP1062057B1 (en)
JP (1) JP2002505954A (en)
KR (1) KR100462351B1 (en)
CN (1) CN1138601C (en)
DE (2) DE19811266C1 (en)
WO (1) WO1999046061A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9822880D0 (en) * 1998-10-21 1998-12-16 Russel Finex Improved efficiency ultrasonic sieving apparatus
JP2002011409A (en) * 2000-06-30 2002-01-15 Honda Electronic Co Ltd Ultrasonic sieving device
US7017754B2 (en) 2002-11-21 2006-03-28 Hitachi Metals, Ltd. Method and apparatus for classifying fine balls and method for producing cylindrical sieve
CN100414830C (en) * 2003-08-26 2008-08-27 财团法人工业技术研究院 Load adjustable surface acoustic wave actuator
JP4402966B2 (en) * 2004-01-22 2010-01-20 新日本製鐵株式会社 Ultrasonic square sieve device
JP4521599B2 (en) * 2004-11-08 2010-08-11 本多電子株式会社 Sieve device
JP4729385B2 (en) * 2005-11-08 2011-07-20 株式会社村上精機工作所 Vibrating sieve device
EP2067534A1 (en) * 2007-12-05 2009-06-10 Artech Systems AG Screaning system with tube-like screan and method for operating a screaning system with tube-like screan
WO2016141971A1 (en) * 2015-03-10 2016-09-15 Telsonic Holding Ag Screening system, eddy-current screening machine, and use of a screening system or of an eddy-current screening machine
EP3268137B1 (en) * 2015-03-10 2023-11-01 Telsonic Holding AG Screening system, eddy-current screening machine, and use of a screening system or of an eddy-current screening machine

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Publication number Priority date Publication date Assignee Title
US4062768A (en) * 1972-11-14 1977-12-13 Locker Industries Limited Sieving of materials
FR2682050B1 (en) * 1991-10-08 1994-07-22 Chauvin Sarl Ets SCREENING DEVICE EQUIPPED WITH DECOLMATION MEANS.
DE59405272D1 (en) * 1993-05-26 1998-03-26 Telsonic Ag DEVICE AND METHOD FOR SCREENING, CLASSIFYING, VIEWING, FILTERING OR SORTING SUBSTANCES
DE4418175C5 (en) * 1993-05-26 2006-02-16 Telsonic Ag Apparatus and method for sifting, classifying, sifting, filtering or sorting fabrics

Non-Patent Citations (1)

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Title
See references of WO9946061A1 *

Also Published As

Publication number Publication date
KR20010034570A (en) 2001-04-25
EP1062057B1 (en) 2002-06-19
WO1999046061A8 (en) 1999-10-21
WO1999046061A1 (en) 1999-09-16
CN1292735A (en) 2001-04-25
CN1138601C (en) 2004-02-18
JP2002505954A (en) 2002-02-26
DE19811266C1 (en) 1999-08-05
KR100462351B1 (en) 2004-12-17
DE59901794D1 (en) 2002-07-25

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