Hydraulic vibrator for actuator drive

摘要

As a drive in metal-cutting machines used for vibration cutting a hydraulic vibrator is proposed, which comprises a differential piston and a spring-balanced slide valve, which are made and arranged so as to ensure reciprocal successive communication between a pressurized chamber and discharge and inlet chambers. In said vibrator the smaller diameter d and the larger diameter D of said piston are in a relation of d = 2ROOT D2/2, and as a result the piston reciprocates symmetrically with an equal speed in either directions. There is also provided a plurality of compensating chambers controlled by throttles of a variable section. Continuous regulation of the magnitude of the stroke of said differential piston is effected in the hydraulic vibrator over a large range. In such a case a magnitude of the piston's stroke of less than one millimeter can be achieved in addition, the reciprocating displacements of said differential piston will always be smooth and noise-free, the adjustment and control of such parameters as frequency and amplitude of the oscillation during operation are measurably simplified, and symmetrical travel of the piston during operation by simple adjustment and control is possible.