| 摘要 |
The invention provides a harvesting shaker with a set of primary eccentric weights and secondary eccentric weights. The invention rotates the primary and secondary eccentric weights at the same speed, but may on the fly, using a hydraulic rotary actuator, change the rotational phase between the primary and secondary eccentric weights, causing an on the fly change of amplitude of the inventive shaker. The invention also uses a rotary valve, that does not require high pressure bearings, and that provides damping of the control system.
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