Patent ID: 6105685
Filing Date: 2000-08-22
Classification: B06B

Abstract:
An adjusting device for an unbalance vibrator having a vibrating mass, the device comprising:at least a first pair of part unbalance elements of a first kind (102, 106) and a second pair of part unbalance elements of a second kind (104, 108), each of the unbalance elements being driveable to rotate about an associated axis, each of the unbalance elements having:a partial centrifugal force vector, the sum of the partial centrifugal force vectors defining a resultant centrifugal force vector whose effect causes the mass of the vibrator to execute directional oscillations, anda partial unbalance moment vector, the sum of all the partial unbalance moment vectors defining a resultant unbalance moment, the resultant unbalance moment vector being proportional to the resultant centrifugal force vector,the partial centrifugal force vectors of the unbalance elements of the first kind defining a setting angle .beta. relative to the partial centrifugal force vectors of the unbalance elements of the second kind, wherein the relative setting angle .beta. may be set within a range from about .beta.=0.degree. to about .beta.=.+-.180.degree. for the maximum setable resultant unbalance moment, it being possible to pass through the range of adjustment of the relative setting angle .beta., at least during the operation of the vibrator, without outputting useful power;a first hydraulic operating circuit including a pump (P1) and a pair of motors (110, 112) connected in parallel and a second hydraulic operating circuit including a pump (P2) and a pair of motors (114, 116) connected in parallel, a rotor of each motor of the first and second hydraulic operating circuits being coupled to a respective part unbalance element of the first and second kind, respectively, in such a way that a torque can be transmitted therebetween;at least one drive motor (DM) coupled to the pumps of the first and second hydraulic operating circuit by a connection (122) via which connection drive power can be supplied to the pump or taken from it;control means for directly or indirectly setting the relative setting angle .beta. by setting a predefinable value for the relative setting angle .beta., setting a predefinable value for the amplitude of the oscillatory travel x, or setting a predefinable value for the amplitude of a time derivative x' or x"" thereof, the predefinable value falling within a range of a minimum resultant centrifugal force vector to a maximum resultant centrifugal force vector; andmeans for measuring the current value of a controlled variable as the magnitude of the relative setting angle .beta. is influenced directly or indirectly;wherein, the motors of the first hydraulic operating circuit are operated purely as motors and the motors of the second hydraulic operating circuit are alternately operated as generators and motors, hydraulic power generated when the motors of the second hydraulic operating circuit are operated as generators being essentially converted into a corresponding motor power that is output by the pump (P2) of the second hydraulic operating circuit.