WO1995015221A1 - Procede et systeme permettant de maitriser l'amplitude de vibrations - Google Patents

Procede et systeme permettant de maitriser l'amplitude de vibrations Download PDF

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Publication number
WO1995015221A1
WO1995015221A1 PCT/DK1994/000451 DK9400451W WO9515221A1 WO 1995015221 A1 WO1995015221 A1 WO 1995015221A1 DK 9400451 W DK9400451 W DK 9400451W WO 9515221 A1 WO9515221 A1 WO 9515221A1
Authority
WO
WIPO (PCT)
Prior art keywords
armature
vibrator
vibration system
amplitude
electromagnet
Prior art date
Application number
PCT/DK1994/000451
Other languages
English (en)
Inventor
Steen Hjorth Hansen
Original Assignee
Skako A/S
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 Skako A/S filed Critical Skako A/S
Priority to AU11067/95A priority Critical patent/AU1106795A/en
Publication of WO1995015221A1 publication Critical patent/WO1995015221A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G27/00—Jigging conveyors
    • B65G27/10—Applications of devices for generating or transmitting jigging movements
    • B65G27/32—Applications of devices for generating or transmitting jigging movements with means for controlling direction, frequency or amplitude of vibration or shaking movement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B06B1/0207—Driving circuits
    • B06B1/0223—Driving circuits for generating signals continuous in time
    • B06B1/0238—Driving circuits for generating signals continuous in time of a single frequency, e.g. a sine-wave
    • B06B1/0246—Driving circuits for generating signals continuous in time of a single frequency, e.g. a sine-wave with a feedback signal
    • B06B1/0261—Driving circuits for generating signals continuous in time of a single frequency, e.g. a sine-wave with a feedback signal taken from a transducer or electrode connected to the driving transducer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B06B1/04—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with electromagnetism
    • B06B1/045—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with electromagnetism using vibrating magnet, armature or coil system
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B2201/00—Indexing scheme associated with B06B1/0207 for details covered by B06B1/0207 but not provided for in any of its subgroups
    • B06B2201/40—Indexing scheme associated with B06B1/0207 for details covered by B06B1/0207 but not provided for in any of its subgroups with testing, calibrating, safety devices, built-in protection, construction details
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B2201/00—Indexing scheme associated with B06B1/0207 for details covered by B06B1/0207 but not provided for in any of its subgroups
    • B06B2201/70—Specific application

Definitions

  • the invention concerns a method of regulating amplitudes in a vibration system which is excited in operation by a vibrator, which is driven by an electric current and which comprises a stationary electromagnet and a oscillatorily suspended arma ⁇ ture, as well as a vibrator regulation circuit for setting the oscillation amplitude of the armature, and a vibration system for performing the method.
  • Vibration systems are extensively used in vibration conveyors which are employed for conveying many different types of mate ⁇ rials within industry, construction and agriculture.
  • a conveyor substantially consists of a trough which is oscillato- rily supported by a plurality of springs and of an electromag ⁇ netic vibrator serving to impart cyclic oscillations to the trough in such a manner that a material present in the trough is thrown upwardly and forwardly in each cycle, causing the ma ⁇ terial to be successively conveyed from one end of the trough to the other.
  • the vibrator operates by passing a pulsating current through the windings of the electromagnet, thereby generating a corre ⁇ sponding pulsating magnetic field which oscillates the oscilla- torily suspended armature with associated oscillation mass to and fro with respect to the electromagnet.
  • the material to be transported and the conveyor in combination constitute a usually subcritically tuned operating oscillation system.
  • the operating mass and the counter-oscillating mass should desirably be tuned close to the natural oscillation range of the system.
  • the vibration regulation circuit is adapted for successive upward regulation of the oscillation amplitude of the armature
  • the system moreover includes a sensor for detecting bottom strokes between the armature and the electromagnet and to apply a signal, representative of this size, via an auxil- iary circuit to the vibrator regulation circuit, instructing said circuit to regulate the amplitude downwards when the arma ⁇ ture hits the electromagnet with a bottom stroke after a prede ⁇ termined period of time.
  • This structure ensures that the safety distance between the ar ⁇ mature and the electromagnet is minimized and is eliminated upon a bottom stroke, and that the system may be adjusted close to the natural oscillation range, so that the vibrator will have an optimum operation performance.
  • the distance is in- creased slightly upon a bottom stroke, but immediately thereaf ⁇ ter the distance again gradually diminishes and is reduced to zero after e.g. an hour, because the armature then hits the electromagnet with a bottom stroke.
  • this stroke is al ⁇ most in the nature of a slight touch, which is not capable of damaging the electromagnet since the state has been reached through a relatively long period of time in very small stepwise increases in the amplitude of the armature.
  • the vibrator regulation circuit is adapted for successive upward regulation of the oscillation amplitude of the armature, a positive voltage of some volts being applied between two set points in the circuit.
  • the armature will thereby eventually hit the electromagnet, causing the sensor to apply a special overshoot signal which is converted via the auxiliary circuit into a negative voltage difference across the set points.
  • the vibration amplitude of the armature is immediately regulated downwards.
  • the sensor is typically an accelerometer which normally applies sine-shaped signals. This signal is distorted by the overshoot signal upon a bottom stroke.
  • the auxiliary circuit is designed such that it is just this overshoot signal which is allowed to pass through the auxiliary circuit to activate the vibrator regulation circuit.
  • the auxiliary circuit moreover includes a timer for determining the period of time that has to elapse before a new bottom stroke occurs.
  • fig. 1 is a lateral view of a typical vibration conveyor having an electromagnetic vibrator
  • fig. 2 is a schematic cross-sectional view through the vibrator of fig. 1 having a sensor for controlling the vibrator via an electric auxiliary circuit and a vibrator regulation circuit
  • fig. 3 is a block diagram of the auxiliary circuit
  • fig. 4 is a curve showing the signals applied by the sensor when the armature oscillates freely.
  • fig. 5 shows the corresponding signal upon a bottom stroke.
  • Fig 1. shows a typical vibration system in the form of a vibra- tion conveyor which is generally designated 1.
  • This conveyor consists of a trough 2 which is supported via springs 3 by a frame 4 standing on a floor 5.
  • a vibrator 6 serves to excite the conveyor so that materials placed in the trough 2 are con ⁇ veyed forwardly.
  • the structure of this vibrator is shown in fig 2.
  • the vibrator has a housing 7 in which a stationary electromagnet 8 having a coil 9 is secured. When an electric current is passed through this coil, a magnetic field is formed, attracting an armature 10 having an oscillating mass 11 which is oscillatorily sus ⁇ pended in the housing 6 by means of springs 12.
  • the cur ⁇ rent through the coil 9 of the electromagnet 8 is allowed to pulsate with a suitable frequency
  • the armature 10 with the os ⁇ cillating mass 11 is caused to oscillate with the same fre- quency to and fro with respect to the electromagnet 8.
  • the os ⁇ cillations are transferred as vibrations to the housing 7 which thereby excites the trough 2, as mentioned before.
  • the amplitude of the armature is determined by the voltage across the coil 9. The amplitude increases with increasing voltage.
  • the armature is arranged at a distance a from the electromagnet to permit the armature to oscillate freely with respect to the electromagnet. Of course, this distance changes constantly during each oscillation cycle.
  • the voltage across the coil 9 is controlled by a thyristor con- trol 13 having two symbolically shown set points 14a, 14b. These two set points are connected via a wire 15 to an auxil ⁇ iary circuit 16, whose importance will be described more fully below.
  • the vibrator moreover accommodates an accelerometer 17 in the form of e.g. a piezoelectric crystal which is connected to the auxiliary circuit 16 by means of wires 18.
  • Fig. 3 is a block diagram showing how the auxiliary circuit 16 is designed.
  • the set points 14a, 14b of the thyristor control are visible in the diagram.
  • the acceleration of the system is measured by the accelerometer 17, which thereby supplies a current of e.g. between 4 and 20 milliamperes which is converted into a voltage signal in a I/U converter 18.
  • the armature 10 oscillates freely, e.g.
  • the voltage signal will be in the form of first harmonic oscillations or sine-shaped oscillations, as illustrated in fig. 4.
  • a Schmitt-trigger 22 is moreover provided in the circuit after these filters 20, 21, and the in- put of the Schmitt-trigger thus does not receive any voltage signal when the armature oscillates freely. The signal changes its nature upon a bottom stroke, as a typi ⁇ cal overshoot signal occurs, which is illustrated in fig. 5.
  • this overshoot signal can pass the filters 20, 21, so that the Schmitt-trigger 22 charges a capacitor 24 via a first resistor 23.
  • the voltage hereby generated on the capacitor 24 controls the current in a constant current generator 27 via a transistor 26.
  • a control voltage exists across the set points 14a, 14b, which causes the thyristor con ⁇ trol 13 to successively increase the voltage across the coil 9 of the electromagnet 8, thereby increasing the amplitude of the armature 10 correspondingly.
  • a diode 28 and a third resistor 29 are inserted between the set points 14a,b.
  • the current of the constant current generator 27 is regulated by the voltage on the capacitor 24 upon a bottom stroke, the voltage across the set points 14a,b is regulated, whereby the thyristor control 13 regulates the current intensity through the coil 9 and thereby the oscillation amplitude of the arma ⁇ ture downwards. If, in spite of the downward regulation, one or more new bottom strokes should occur, the process is repeated until the armature oscillates freely, and the voltage signal from the accelerator 17 only consists of first harmonic oscil ⁇ lations which do not arrive at the input of the Schmitt-trigger 22. Then the thyristor control again begins to regulate the am ⁇ plitude of the armature upwards.
  • the capacitor 24 is still charged and affects the constant current generator 27 with a voltage causing the con ⁇ stant current generator to reduce the control voltage across the set points 14a,b, so that this control voltage does not im- mediately reach the value where the amplitude of the armature is greatest and bottom stroke occurs. This situation does not occur until the capacitor 24 has been discharged via the resis ⁇ tor 25. The amount of time this takes is determined by the ca- pacity of the capacitor 24 and the size of the resistor 25. Thus, the capacitor 24 and the resistor 25 in combination con ⁇ stitute a timer which decides how long it takes before the ar ⁇ mature again hits the electromagnet.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Jigging Conveyors (AREA)

Abstract

Pendant son fonctionnement, un vibreur entraîné par un courant électrique, excite un système vibratoire. Le vibreur (6) comprend un électro-aimant (8) stationnaire et un induit (10), suspendu de façon à pouvoir osciller, ainsi qu'un circuit de régulation de vibrations permettant de régler l'amplitude d'oscillation de l'induit (10). Ce circuit (13) de régulation du vibreur est conçu pour réguler progressivement cette amplitude à la hausse. Le système comporte en outre un accéléromètre (17), détectant l'ampleur de son accélération momentanée, qui applique un signal de tension en réponse à l'accélération détectée. Ce signal de tension commande le circuit (13) de régulation du vibreur, par l'intermédiaire d'un circuit (16) auxiliaire, pour qu'il régule l'amplitude d'oscillation de l'induit (10) à la baisse en cas de talonnement.
PCT/DK1994/000451 1993-12-02 1994-12-02 Procede et systeme permettant de maitriser l'amplitude de vibrations WO1995015221A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU11067/95A AU1106795A (en) 1993-12-02 1994-12-02 Method and system for controlling vibration amplitude

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK134693A DK134693A (da) 1993-12-02 1993-12-02 Vibrationssystem
DK1346/93 1993-12-02

Publications (1)

Publication Number Publication Date
WO1995015221A1 true WO1995015221A1 (fr) 1995-06-08

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ID=8103844

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK1994/000451 WO1995015221A1 (fr) 1993-12-02 1994-12-02 Procede et systeme permettant de maitriser l'amplitude de vibrations

Country Status (3)

Country Link
AU (1) AU1106795A (fr)
DK (1) DK134693A (fr)
WO (1) WO1995015221A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0760497A1 (fr) * 1995-08-29 1997-03-05 MRW DIGIT Electronicgeräte GmbH Unité d'actionnement pour un convoyeur à vibrations entraîné électriquement
WO2007147419A1 (fr) * 2006-06-19 2007-12-27 Scanvaegt International A/S Balance à plusieurs têtes et son procédé de fonctionnement
RU182376U1 (ru) * 2017-07-17 2018-08-15 Валентин Яковлевич Потапов Вибратор резонансного действия с электромагнитным приводом
EP3059187B1 (fr) * 2015-02-19 2023-02-22 Afag Holding AG Dispositif de capteur destine a preparer au moins un parametre de fonctionnement d'un convoyeur oscillant et convoyeur oscillant

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH411414A (de) * 1963-11-28 1966-04-15 Elektron Ag Elektromagnetischer Vibrator
DE1447330A1 (de) * 1964-06-12 1968-11-28 Licentia Gmbh Warn- und Schutzeinrichtung fuer Schwingfoerdergeraete
DE2247605A1 (de) * 1971-11-22 1973-05-30 Stassfurt Veb Chemieanlagenbau Verfahren zum betrieb elektromagnetischer schwingungserzeuger mit anschlagwaechter
DE4122286A1 (de) * 1991-07-05 1993-01-14 Licentia Gmbh Verfahren zum betreiben eines magnetisch angetriebenen schwingfoerdergeraetes
DE4210287C1 (en) * 1992-03-28 1993-02-11 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt, De EM oscillation inducer with U=shaped core for windings - has measurement value pick=up for high efficiency but preventing armature in air gap impacting shanks of magnetic core

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH411414A (de) * 1963-11-28 1966-04-15 Elektron Ag Elektromagnetischer Vibrator
DE1447330A1 (de) * 1964-06-12 1968-11-28 Licentia Gmbh Warn- und Schutzeinrichtung fuer Schwingfoerdergeraete
DE2247605A1 (de) * 1971-11-22 1973-05-30 Stassfurt Veb Chemieanlagenbau Verfahren zum betrieb elektromagnetischer schwingungserzeuger mit anschlagwaechter
DE4122286A1 (de) * 1991-07-05 1993-01-14 Licentia Gmbh Verfahren zum betreiben eines magnetisch angetriebenen schwingfoerdergeraetes
DE4210287C1 (en) * 1992-03-28 1993-02-11 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt, De EM oscillation inducer with U=shaped core for windings - has measurement value pick=up for high efficiency but preventing armature in air gap impacting shanks of magnetic core

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DERWENT'S ABSTRACT, No. 91-351825/48, week 9148; & SU,A,1 618 458 (SUMSK KHARK POLY), 8 April 1988. *
PATENT ABSTRACTS OF JAPAN, Vol. 11, No. 316, M-631; & JP,A,62 100 311 (MEIJI ENG K.K.), 9 May 1987. *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0760497A1 (fr) * 1995-08-29 1997-03-05 MRW DIGIT Electronicgeräte GmbH Unité d'actionnement pour un convoyeur à vibrations entraîné électriquement
WO2007147419A1 (fr) * 2006-06-19 2007-12-27 Scanvaegt International A/S Balance à plusieurs têtes et son procédé de fonctionnement
EP3059187B1 (fr) * 2015-02-19 2023-02-22 Afag Holding AG Dispositif de capteur destine a preparer au moins un parametre de fonctionnement d'un convoyeur oscillant et convoyeur oscillant
RU182376U1 (ru) * 2017-07-17 2018-08-15 Валентин Яковлевич Потапов Вибратор резонансного действия с электромагнитным приводом

Also Published As

Publication number Publication date
DK134693A (da) 1995-06-03
DK134693D0 (da) 1993-12-02
AU1106795A (en) 1995-06-19

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