Abstract
Screw conveyors are widely used in conveying bulk solid materials, and higher conveying stability is required for product uniformity and weighing accuracy. The purpose of this paper is to improve particle conveying stability in screw feeders. The characteristics of particle mass flow rate (MFR) are investigated to reveal the periodic fluctuation mechanism. Different screw structures are designed to reduce MFR fluctuation and improve conveying stability. Results show that the optimal conveying stability occurs when the variable diameter extension (VDE) is twice the pitch length and the diameter reduction ratio is 0.92, which is verified by experimental data. Compared with the standard screw, the MFR fluctuation relative standard deviation of the VDE screw decreases from 29.79 % to 2.03 %. Moreover, the particle force on the screw feeding device casing is indicated. The larger average compressive force of particles on the device wall significantly increases the device damage probability and particle agglomeration.
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