Patent ID: 6345546
Filing Date: 2002-02-12
Classification: B06B,E02D,Y10T

Abstract:
Device for automatic control of the amplitude of the vibrations of a variable-moment vibrator used to drive objects into the ground, said vibrator comprising at least two trains of eccentric feeders each comprising at least two eccentric feeders mounted rotatably about shafts integral with two respective pinions meshing with one another so as to rotate in opposite directions to one another, under the effect of a motorization which comprises one or more motors a variation of the vibratory moment generated by the two trains of feeders being obtained by means of a phase shifter capable of generating a variable angular phase shift between the rotary motions of the two trains of feeders,wherein said device further comprises at least one accelerometric detector positioned so as to be subjected to the vibrations generated by the vibrator, a means for deducing a value representing the harmfulness of the vibrations on the basis of the accelerometric data provided by the accelerometric detector, a means for entering a set value, and an electronic processing means associated with an actuating means acting on the phase-shift control of the phase and/or a motorization speed variation control in order to maintain the value representing the harmfulness of the vibrations at a level equal to or lower than the set value.