Abstract
The contact force between particles is analysed in this paper. Firstly, theoretical analysis is carried out based on the Hertz–Mindlin (no slip) model. Secondly, the normal force and tangential force are, respectively, simulated in single/double‐flight screw feeders with the discharging device at three rotating speeds (60 rpm, 90 rpm, and 120 rpm) using different diameter particles (3 mm, 5 mm, and 7 mm) by the extended distinct element method (EDEM) software. Finally, the simulation results show that the particle diameter has the biggest impact on average contact force in the feeding process. This research provides theoretical basis for the study of the rule of bulk material movement in the screw feeder and the development of the high‐precision feeding machine.
Highlights
Theoretical analysis is carried out based on the Hertz–Mindlin model
The simulation results show that the particle diameter has the biggest impact on average contact force in the feeding process. is research provides theoretical basis for the study of the rule of bulk material movement in the screw feeder and the development of the high-precision feeding machine
If the tangential force Ft exceeds the yield value, the two particles will slide under the normal force Fn and the frictional resistance, which is simulated by the slider damper [20]
Summary
Received 3 November 2017; Revised 6 July 2018; Accepted 22 July 2018; Published 19 August 2018 Academic Editor: Charles C. The normal force and tangential force are, respectively, simulated in single/double-flight screw feeders with the discharging device at three rotating speeds (60 rpm, 90 rpm, and 120 rpm) using different diameter particles (3 mm, 5 mm, and 7 mm) by the extended distinct element method (EDEM) software. Introduction e screw feeder is widely used in the short distance transportation of bulk material in agricultural and biological engineering [1,2,3,4,5,6] It is mainly composed of trough, bin, and screw shaft. E simulations are, respectively, carried out in single-flight and double-flight screw feeders at three rotating speeds (60 rpm, 90 rpm, and 120 rpm) when feeding different diameter particles (3 mm, 5 mm, and 7 mm).
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