PURPOSE: A vacuum vibrating feeder is provided to extend the life of a flow sensor and to improve accuracy of a measurement result of the flow sensor. CONSTITUTION: A vacuum vibrating feeder comprises a feeder main body(110), a vibrator, a flow sensor(140), and a vibration proof unit(200). The feeder main body supplies a path in which alloy steel of an alloy steel storage tank moves to a degassing facility. The vibrator is installed to generate vibration. The flow sensor comprises a displacement unit and a detecting unit the residual detecting alloy steel. The vibration proof unit supports the detecting unit in order to penetrate the displacement unit and absorbs the vibration generated in the feeder main body.
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