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Quarrying Lime Vibrating Feeder Device

2008128dear all, imagin to have a vibrating feeder under a hopper, with a certain cross section at the outlet does anyone know if there is a ratio to respect between the height of the outlet and the max particle size 2a feeder under the hopper full of material with a wide range in grain size from dust to big rocks will have enough "extraction force" to empty it or it is better to use an apron.