| 摘要 |
A pneumatic vibratory bin discharge cone for dry bulk material bins is provided with an annular raised ridge on the inner surface of the frustoconical discharge duct for improved intermittent sealing engagement of the vibrating member with the duct, whereby to create desired vibratory action of the member and to assure positive initiation of material flow from the bin. The raised ridge cooperates with the vibrating member to automatically intensify the amplitude of the latter when resistance to material flow from the bin is encountered such that bin-directed shock waves are created tending to break up flow-resisting conglomerates and bridges in the material. In one embodiment, a novel pneumatic system is disclosed, such system allowing adjustment of air flow to the flexible member whereby the latter may be vibrated without aerating the material. Another embodiment shows a pneumatic system utilizing a rotary pump in parallel with a sealed reciprocating piston assembly whereby the flexible member is provided with the benefits of surge action from the reciprocating piston while at the same time the continuous action rotary pump precludes undesired backwash of bulk material into the pneumatic lines.
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