VIBRATORY EXCITER Russian patent published in 2002 - IPC

FIELD: construction, chemical, food-processing, mining industry. SUBSTANCE: vibratory exciter with variable static moment has drive shaft and brackets rigidly fixed on shaft at different sides with respect to shaft axis. Main and additional retractable unbalancing devices are pivotally arranged on brackets of drive shaft in opposed relation one with respect to another. Additional retractable unbalancing device is mounted on drive shaft for displacement from drive shaft toward side opposed to direction of possible displacement of main retractable unbalancing device. Unbalancing devices are equipped with springs for returning thereof to initial position. Since adjustment force of main unbalancing device return spring has lower rotational frequency of drive shaft, main unbalancing device moves to position most distant from shaft axis, when drive shaft reaches mentioned rotational frequency, to transmit maximal static moment to unbalancing vibratory exciter. At further increase of rotational frequency of drive shaft, static moment of unbalancing device remains constant, when rotational frequency does not reach adjustment frequency of spring of additional unbalancing device. When drive shaft reaches mentioned rotational frequency, additional unbalancing device moves to position most distant from drive shaft axis. Total static moment of inertia of unbalancing device is decreased. EFFECT: wider operational capabilities of controlling technological parameters of vibratory exciter and enhanced reliability in operation. 2 dwg