| 摘要 |
A centrifugal vibratory exciter of this invention has a tubular rotatable exciter shaft on which a centrifugal mass is eccentrically fixed and in which a control shaft is axially slideably adjustable. Surrounding the exciter shaft, rotatable but not axially slideable relative to it, is a tubular counterweight carrier on which a counterweight mass is eccentrically fixed. A transverse pin carried by the control shaft projects through a slot in the exciter shaft that is elongated lengthwise of it and into a helical groove in the counterweight carrier, to translate axial adjustment of the control shaft into rotation of the counterweight carrier about the exciter shaft but to constrain the counterweight carrier to rotate with the exciter shaft in any position of axial adjustment of the control shaft. Adjusting rotation of the counterweight carrier about the exciter shaft brings the counterweight mass into phase or out of phase with the centrifugal mass, correspondingly increasing or decreasing vibratory force due to exciter shaft rotation.
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