Bulk Solids Pump

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BSP technology does not use the usual screws/augers, belts, pockets or vibratory trays to convey the material. Rather, it employs innovative positive-displacement action to feed pelletized, granular, flaked or other free-flowing materials with consistently high accuracy, uniform discharge and gentle handling in a true linear volumetric fashion.

As illustrated in the accompanying diagram, the BSP consists of one or more specially designed, co-axial, rotating spools. Incoming material is captured within spool voids, becomes trapped in a lock-up condition and thus rotates as a solid mass. Approaching discharge, interparticle forces relax and discharge cascades naturally above the material’s angle of repose.

The BSP principle is best explained as consisting of four zones: consolidation, rotation, relaxation and discharge. In Zone 1 material enters the feeder and consolidates as particles settle and come into contact with one another and the sides of the spool. At the end of Zone 1 the material is fully constrained, and interparticle and surface contact forces produce the desired lock-up condition.

In Zone 2 the material simply rotates as a solid mass. As the material moves past the 6 o’clock position, Zone 3 marks the approach to unconstrained discharge where interparticle forces fall and the material relaxes, restoring its natural flowability.

Discharge occurs in Zone 4 where rotation causes the material to cascade from the feeder. When compared to the pulsing flow from a rotary valve or screw feeder, the smoothness of material flow from the BSP is evident to even the untrained eye. This uniform, pulseless discharge results in improved feeding accuracy, especially at short sample durations.

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