EP0379254A2 - Elektromagnetischer Vibrator mit einstellbarer elastischer Rückwirkung - Google Patents

Elektromagnetischer Vibrator mit einstellbarer elastischer Rückwirkung Download PDF

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Publication number
EP0379254A2
EP0379254A2 EP90200094A EP90200094A EP0379254A2 EP 0379254 A2 EP0379254 A2 EP 0379254A2 EP 90200094 A EP90200094 A EP 90200094A EP 90200094 A EP90200094 A EP 90200094A EP 0379254 A2 EP0379254 A2 EP 0379254A2
Authority
EP
European Patent Office
Prior art keywords
base
electromagnet
vibrator apparatus
electromagnetic vibrator
springs
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.)
Withdrawn
Application number
EP90200094A
Other languages
English (en)
French (fr)
Other versions
EP0379254A3 (de
Inventor
Armando I.T.S. International Dell'acqua
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.)
Its International Technical Service Srl
Original Assignee
Its International Technical Service Srl
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 Its International Technical Service Srl filed Critical Its International Technical Service Srl
Publication of EP0379254A2 publication Critical patent/EP0379254A2/de
Publication of EP0379254A3 publication Critical patent/EP0379254A3/de
Withdrawn legal-status Critical Current

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Classifications

    • 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

Definitions

  • the subject of the present invention is an electromagnetic vibrator apparatus with elastic reaction which can be continuously adjusted, even during operation.
  • such structures for containing the materials are equipped with devices adapted for setting them in vibration with the desired frequency and amplitude.
  • the electromagnetic vibrators in which the vibration is generated by attracting an armature by means of an electromagnet, in opposition to an elastic means, actuating the electromagnet with a suitable excitation frequency.
  • the electromagnet connected to the armature by an interposed elastic element, shall be supplied with a pulsed voltage, produced by partly rectifying the alternating voltage of the mains.
  • the excitation frequency of the electromagnet which causes the vibration of the system, is the mains frequency and is therefore constant.
  • the vibratory characteristics of the complex composed of the vibrator apparatus and of the structure connected to it to be such as to possess a natural frequency of vibration close to resonance with the imposed frequency but not coincident with it, so as to have induced vibrations of sufficient amplitude, while nevertheless keeping said amplitude under control.
  • the excitation frequency of the electromagnet of the vibrator apparatus being constant, and the characteristics of the structure set in vibration, especially its mass, being determined by the requirements in use, it is necessary to act on the mechanical characteristics of the vibrator apparatus and thereby tune it to the assembly to which it is fitted.
  • the vibratory behaviour of a body is determined by its mass and by its elastic constant; therefore, in order to tune the vibrator apparatus to the structure which is to be set in vibration, it is possible to select for it a particular value of elastic reaction.
  • Vibrator apparatuses which are equipped with elastic reaction means constituted of a leaf spring packet, secured to the armature and to the electromagnet; in such devices, the tuning to the characteristics of the structure to be set in vibration can be achieved by varying the number of leaf springs forming the packet, by adding or removing one leaf of the median number of leaves provided; alternatively, it is possible to vary the distance between the sup­ports of the ends of the leaves.
  • the adjustment in one case is therefore discontinuous in nature, it being possible for the elastic constant to be varied by a finite num­ber, achieving an approximate tuning, and furthermore in both cases it is necessary, in order to carry out the adjustment, to effect an at least partial dismantling and reassembly of the apparatus, or indeed to carry out complete operations, which can only be effected by specialized personnel, requiring appreciable time.
  • an electromagnetic vibrator apparatus comprising a base capable of being connected to an object to be set in vibration, an electromag­netic armature integral with the base and an electromagnet facing the armature and connected to the base by an elastic means, in which the elastic means connecting the base to the electromagnet has constant stiffness, at least one adjusting unit being interposed between the electromagnet and the base, this adjusting unit comprising elastic means with adjustable prestress.
  • the elastic means of constant stiffness interposed between the elec­tromagnet and the base is constituted of at least one elastic strip of suitable thickness, having a curvature extending through an arc of at least 180 o .
  • the elastic means of constant stiffness is constituted of a strip curved to a part of a cylindrical surface extending through an arc greater than 180 o , secured at its ends to the base, and carrying the electromagnet secured in an intermediate position.
  • the elastic means of constant stiffness is consti­tuted of a pair of strips curved to a portion of a cylindrical surface and extending through an arc of approximately 180 o , each being secured at one end to the base and at the other end to the electromagnet, on opposite sides of same.
  • the adjusting unit comprises a pair of helical springs aligned and secured by means comprising screws to a rod integral with the base, between which springs there is interposed a plate slidable on the rod and integral with the electromagnet, the screw means for securing the springs on the rod being adjustable in position, thereby varying the initial deformation imparted to the springs themselves.
  • two adjusting units are present, disposed symmetrically on opposite sides of the electromagnet.
  • the screw means for securing the springs on the rod are directly acces­sible, for the adjustment of the prestress of the springs, while the apparatus is in operation.
  • a vibrator apparatus comprises a base 1, to which there is secured, by means of the screws 2, an armature 3, opposite which is an electromagnet 4, which is connected to a heavy body 5, also termed reaction mass, in turn attached to the base 1 by means of an elastic element, composed of a metal strip 6, shaped to an arc.
  • reaction mass 5 is secured to the arc-shaped strip 6 by screws 7 and associated small plates 8, while the small plates 9 and the screws 10 secure the arc-shaped strip 6 to the base 1.
  • the base 1 enables the vibrator apparatus to be fitted to the machine or to the element of a machine which is to be set in vibration.
  • the electromagnet 4 is supplied with a pulsating voltage at constant frequency, of adjustable strength; when the electromagnet is ener­gized, it attracts the armature 3, bending the strip 6 which, when the voltage pulse ceases, again brings back the electromagnet, and the mass 5 securely fixed to it, to the initial distance from the armature.
  • This movement repeated at the frequency of the excitation pulses, therefore causes a vibration which is transmitted to the object to which the vibrator apparatus is fitted, thereby keeping it in the desired vibrational state.
  • the adjusting unit 12 is adjusted by varying the prestress value of the springs 14, by means of the nuts 15.
  • the desired adjustment, carried out by an appropriate tightening of the nuts 15, is particularly easy and can be effected even while the vibrator apparatus is fitted and is in operation, and it can be carried out by the users, without requiring specialized personnel and by directly controlling the correctness of the adjustment carried out.
  • a curved elastic strip furthermore, enables a high elastic characteristic to be achieved by the use of one single strip, simple and economical to construct and to install, as compared with the flat leaf springs previously used.
  • the adjustment of the elastic constant of the system achieved by means of the adjusting units 12, enables the desired tuning, in relation to the total mass to be set in vibration, to be obtained in an especially easy manner.
  • the adjusting units 12 may also be fitted to a vibrator apparatus of different construction, for example of the conventional type with a packet of flat leaf springs, thus giving to them also the possibility of achieving an easy adjustment of the elastic characteristics of the complex.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Electromagnets (AREA)
  • Jigging Conveyors (AREA)
EP19900200094 1989-01-18 1990-01-15 Elektromagnetischer Vibrator mit einstellbarer elastischer Rückwirkung Withdrawn EP0379254A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT1911789 1989-01-18
IT8919117A IT1228480B (it) 1989-01-18 1989-01-18 Apparecchio vibratore elettromagnetico con reazione elastica regolabile

Publications (2)

Publication Number Publication Date
EP0379254A2 true EP0379254A2 (de) 1990-07-25
EP0379254A3 EP0379254A3 (de) 1991-02-27

Family

ID=11154833

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900200094 Withdrawn EP0379254A3 (de) 1989-01-18 1990-01-15 Elektromagnetischer Vibrator mit einstellbarer elastischer Rückwirkung

Country Status (2)

Country Link
EP (1) EP0379254A3 (de)
IT (1) IT1228480B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4442262A1 (de) * 1994-11-28 1996-05-30 Kaltenbach & Voigt Rüttler für ein Labor, insbesondere für ein medizinisches oder dentales Labor
EP1972296A1 (de) * 2007-03-19 2008-09-24 Renfert GmbH Dentalgeräterüttelvorrichtung

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2180189A (en) * 1934-10-13 1939-11-14 Central Electric Tool Company Vibrator
US2694156A (en) * 1951-01-09 1954-11-09 Syntron Co Tuning of vibratory systems
DE1081180B (de) * 1955-09-26 1960-05-05 Siemens Elektrogeraete Gmbh Kolbenkompressor mit elektromagnetischem Schwingantrieb
DE1497775A1 (de) * 1966-01-04 1969-10-16 Licentia Gmbh Vibrator zum Antrieb von Schwingnutzgeraeten
AT308633B (de) * 1969-11-15 1973-07-10 Transformatoren Union Ag Elektromagnetischer Vibrator

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4442262A1 (de) * 1994-11-28 1996-05-30 Kaltenbach & Voigt Rüttler für ein Labor, insbesondere für ein medizinisches oder dentales Labor
DE4442262C2 (de) * 1994-11-28 1999-06-24 Kaltenbach & Voigt Rütteltisch für ein Labor, insbesondere für ein medizinisches oder dentales Labor
EP1972296A1 (de) * 2007-03-19 2008-09-24 Renfert GmbH Dentalgeräterüttelvorrichtung
DE102007013700B4 (de) * 2007-03-19 2015-05-28 Renfert Gmbh Dentalgeräterüttelvorrichtung

Also Published As

Publication number Publication date
EP0379254A3 (de) 1991-02-27
IT1228480B (it) 1991-06-19
IT8919117A0 (it) 1989-01-18

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