FIELD: vibrating hopper. SUBSTANCE: air bleeding from housing to clearance between housing and member being vibrated is effected through nozzles located over circle; each nozzle is made in form of stepwise widening orifice. Diameter of lower section of orifice is equal is equal to height of upper section and diameter of upper section is equal to sum of diameter of lower section and height of upper section. Clearance between nozzle shear and member being vibrated ranges from 0.01 to 0.015 mm. EFFECT: reduced noise level and consumption of compressed air; increased force. 4 dwg
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