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1. WO1997026090 - MAGNETOSTRICTIVE ACTUATOR

Publication Number WO/1997/026090
Publication Date 24.07.1997
International Application No. PCT/GB1997/000083
International Filing Date 13.01.1997
IPC
B06B 1/08 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
06GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
BGENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
1Processes or apparatus for generating mechanical vibrations of infrasonic, sonic or ultrasonic frequency
02making use of electrical energy
08operating with magnetostriction
E21B 6/00 2006.01
EFIXED CONSTRUCTIONS
21EARTH OR ROCK DRILLING; MINING
BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
6Drives for drilling with combined rotary and percussive action
CPC
B06B 1/08
BPERFORMING OPERATIONS; TRANSPORTING
06GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
BMETHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, ; e.g.; FOR PERFORMING MECHANICAL WORK IN GENERAL
1Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
02making use of electrical energy
08operating with magnetostriction
E21B 6/00
EFIXED CONSTRUCTIONS
21EARTH DRILLING; MINING
BEARTH DRILLING, e.g. DEEP DRILLING
6Drives for drilling with combined rotary and percussive action
Applicants
  • BOART LONGYEAR TECHNICAL CENTRE LIMITED [IE]/[IE] (AllExceptUS)
  • ASTON, Martin, Geoffrey [GB]/[GB] (UsOnly)
  • CLEGG, Sarah, Jayne [GB]/[GB] (UsOnly)
  • GREENOUGH, Rodney, David [GB]/[GB] (UsOnly)
  • FOSTER, Bruce, Allan, George, Edward [GB]/[GB] (UsOnly)
  • JENNER, Alan, George, Ian [GB]/[GB] (UsOnly)
  • METHERINGHAM, William, John [GB]/[GB] (UsOnly)
  • WILKINSON, Anthony, James [GB]/[GB] (UsOnly)
Inventors
  • ASTON, Martin, Geoffrey
  • CLEGG, Sarah, Jayne
  • GREENOUGH, Rodney, David
  • FOSTER, Bruce, Allan, George, Edward
  • JENNER, Alan, George, Ian
  • METHERINGHAM, William, John
  • WILKINSON, Anthony, James
Agents
  • COPP, David, Christopher
Priority Data
9600921.217.01.1996GB
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) MAGNETOSTRICTIVE ACTUATOR
(FR) ACTUATEUR MAGNETOSTRICTIF
Abstract
(EN)
This invention relates to a magnetostrictive actuator, in particular for a percussive rock drill. The actuator comprises an applicator (4, 10, 11) with a magnetostrictive unit (4) having a length of magnetostrictive material and drive means for subjecting the material to a pulsed magnetic field to produce a change in the length of the material on each pulse of the magnetic field. The drive means has a plurality of coils supplied in parallel with an electric drive current pulsed at a drive frequency from one or more drive circuits. A biasing ram (10) may apply a compressive force along the length of the magnetostrictive material to bias a drill bit (2) against the rock (1).
(FR)
L'invention concerne un actuateur magnétostrictif, notamment pour un trépan à percussion. Cet actuateur comprend un applicateur (4, 10, 11) pourvu d'une unité magnétostrictive (4) présentant une longueur de matériau magnétostrictif et des moyens d'excitation pour soumettre ce matériau à un champ magnétique pulsé en vue de produire une modification de la longueur dudit matériau à chaque impulsion du champ magnétique. Les moyens d'excitation sont constitués d'une pluralité de bobines alimentées en parallèle par un courant d'excitation électrique pulsé à une fréquence d'excitation par un ou plusieurs circuits d'excitation. Un bélier de précontrainte (10) peut appliquer une force de compression sur la longueur du matériau magnétostrictif en vue de maintenir un outil de forage (2) contre la roche (1).
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