CONTROL DEVICE FOR VIBRATION GENERATORS FOR GROUND COMPACTING DEVICES

摘要

A control apparatus for a vibration exciter (1) comprises an actuation means for adjusting a phase relationship between at least two mutually counter-rotating unbalanced masses (4a, 4b, 10a, 10b) and a set value input means (31, 32) for setting and changing a target value for the phase angle by on operator. The actuating device comprises a control piston (12a, 12b), wherein the phase position of the unbalanced masses in response to an axial position of the control piston (12a, 12b) is adjustable. The axial position of the control piston (12a, 12b) in turn by a hydraulic system (34) variable, wherein by the hydraulic system (34) of pressurized hydraulic fluid for a certain control period in a piston chamber is supplied to or discharged from the piston chamber, for varying the axial position of the the control piston (12a, 12b). The length of the control period in response to a change of the desired value is determined.