oscillation exciters operated in adjustable disbalance, in particular, to collect objects in the ground.

摘要

The vibrator according to the invention involves two series or eccentric unbalanced masses each comprising at least two unbalanced masses rotating in opposite directions, and at least one motor coupled to the first series of unbalanced masses via a gear train and to the second series of unbalanced masses via a drive device including a phase shifter formed by two coaxial shafts (6, 8) each comprising helical gearing (12, 17) and an annular piston (20) which slides between the two shafts (6, 8) delimiting, between them, at least one working chamber (E1) inside which a pressurised hydraulic fluid may be injected, this piston (20) being provided with helical gearing (22, 24) meshing with that provided on the two shafts (6, 8). …??This vibrator makes it possible to obtain automatic control of the amplitude of the vibrations which it produces as a function of the behaviour of the object subjected to the vibrations. …IMAGE…