ROTOFLOW VIBRATORY SILO DISCHARGER

Silo-discharge station with dynamic-fluidisation technology

A high-performance bottom-discharge unit for the orderly, uninterrupted and uniform discharge from silos of bulk products with either free-flow properties or a low flowability index (prone to bridging and packing) in flour, semolina, pulse and feed mills and raw-material storage terminals. Guaranteeing the lossfree discharge from silos of materials with completely different physical characters — such as wheat, flour and bran — by dynamic vibration, it feeds the tube screws, dosing valves or chain conveyors positioned below at a stable flow.

WORKING PRINCIPLE

Silo-base connection and static-mass reception — rigid integration and load acceptance: active discharge bottom is integrated by sealed flanges straight to the lower conical outlet lines of vertical steel or reinforced-concrete silos; the tonnes-heavy raw-material column inside the silo rests on the unit’s inner flow deflector. Vibro-motor drive and hinge oscillation regime — dynamic kinetic shaking: the high-frequency circular vibration waves produced by the industrial vibro-motor connected to the device are transmitted to the lower-dish body; this movable lower dish, suspended from the main body by high-strength steel hinges, shakes the product on its axis with the acceleration it receives and fluidises it. Bridging-free uninterrupted line feeding — uniform volumetric discharge: by the vibration waves, the sticking of flour or bran to the walls, clogging and bridging are reliably prevented; the raw material, turned fluid, is discharged from the central outlet throat at a fully uniform flow to the tube screws, injector airlocks or conveyor lines below.

KEY ADVANTAGES

- Heavy-duty steel-hinge suspension design: To focus the vibration motion only on the lower kinetic dish without damping it and to transmit no parasitic load to the silo body, the lower dish is rigidly suspended from the main body by specially designed steel hinges; this structure eliminates the breakage and metal-fatigue risks even under the heaviest load.

- Uninterrupted-flow assurance via vibro-motor technology: The industrial vibro-motor with adjustable centrifugal-force blocks is easily calibrated to the ideal oscillation amplitude for the conveyed raw-material type (the granular structure of wheat or the cohesive dust structure of flour/bran).

- Full fit to reinforced-concrete and steel silo infrastructures: With the flexible mounting-flange geometry, it mounts easily onto both the lower outlet cones of reinforced-concrete silos and the base flanges of modular steel silos with no extra adapter chassis.

- AISI 304 stainless steel and special capacity variations: Special-manufacture options are available depending on the hourly target discharge capacity and the product’s chemical aggressiveness; for moist conditioning lines and high-sanitation premium flour passages, models made entirely of AISI 304 stainless steel are widely preferred.

ENGINEERING NOTE

active discharge bottom is a “smart discharge gate” that mechanically fluidises gravity flow in bulk-material storage systems. Especially difficult materials such as flour and fine bran — which pack and dome (form a bridge) within themselves while standing — lose their wall stresses thanks to the controlled circular-oscillation frequency the unit produces. The damping geometry of the steel hinges prevents the vibration from damaging the silo concrete or its steel legs and guarantees that the material in the lower dish flows to the tube screws with precise volumetric stability.