Abstract
The screw flight, 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. However, the existing wear model cannot be directly applied to predict the wear of the screw flight under different working conditions. Hence, we established a new screw flight wear model based on the Archard wear model and Continuous Medium Hypothesis to predict the service life of the screw flight. Three influencing factors, including speed, filling rate, and pitch, were selected to study the wear law of the screw flight, and the wear law was verified by EDEM simulation. Results indicate that the simulation results affected by the changes in various factors were consistent with the calculation model. With the increase of rotation speed and filling rate, the screw flight wear rate increased. Nevertheless, with the increase of pitch, the screw flight wear rate first increased and then decreased. The screw flight wear model can be used to calculate the wear rate under different working conditions for the screw flight life prediction.
Highlights
A vertical screw conveyor is a type of continuous conveying equipment that can lift materials in a short time
This study proves that the Archard wear model can predict equipment wear well. (Xia et al 2019) used EDEM software to study the wear of the scraper conveyor and verified the accuracy of the simulation results through experiments. (Yang 2019) used the EDEM software to study the wear of the screw flight and analyzed the wear of the screw flight under different conditions by changing the filling rate, speed, pitch, and other factors
The higher rotation speed leads to greater wear of the screw flight, and the growth trend of wear becomes higher as the rotation speed increases
Summary
A vertical screw conveyor is a type of continuous conveying equipment that can lift materials in a short time. The EDEM (Discrete Element Method software) which loaded the Archard wear model calculated the force of particle collision on the surface of the equipment at different times and the normal contact pressure Fn of the equipment at different times by statistics to analyze the wear of the equipment. The EDEM software based on the discrete element method is used by more scholars to study the wear of equipment for conveying different bulk materials, and the accuracy of its calculation results has been verified by different experiments. This study established a screw flight wear model based on the Archard wear model which used the Continuous Medium Hypothesis to calculate the normal contact pressure Fn at different positions of the bulk in the vertical screw conveyor. The model was verified and analyzed through the EDEM simulation
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