Continuous medium hypothesis-based study on the screw flight wear model and wear regularity in a screw ship unloader

Abstract

The screw flight on the vertical screw conveyor which is the spiral blade welded on the axial cylinder is the core component of the screw ship unloader and can be seriously worn by the materials during long-term conveying. The damaged screw flight will make the screw ship unloader unable to unload materials or even lead to an accident. Hence, we established a new screw flight wear model based on the Archard wear model and Continuous Medium Hypothesis. Two influencing factors, including speed and filling rate were selected to study the wear law of the screw flight, and the wear law was verified by experimental. Results indicate that the experimental results were consistent with the calculation model. The wear rate of screw flight was approximately parabola increased with the increase of rotational speed and the screw flight wear rate positively and linearly correlated with the filling rate.

The vertical screw conveying characteristics of cohesive particle and optimization of design parameters

“…In the process of screw conveying, the screw blade wears out due to collision with particles. If the screw blade occurs serious wear, it will lead to particles cannot be conveyed [23]. The variation regularity of rotational speed, pitch, and clearance on the maximum wear depth of the blade are studied, respectively based on the Archard wear model.…”

“…To study the wear regularity of the screw blade, Yang et al [23,24] established a new screw conveyor wear prediction model based on the Archard wear model and the continuous medium assumption, and the wear regularity of the screw blade was simulated and experimentally verified at different rotational speeds, filling rates, and pitches.…”