Diagnostic method for main spoke bolt loosening in drum screen based on weighted root mean square error

To address the issue of insufficiently distinct fault signal characteristics in large-volume, low-speed rotating drum screen, an experimental platform for detecting loose main spoke bolts in drum screen was established. The study focuses on the radial displacement signal characteristics of drum screen under different conditions of loose bolts. It categorizes the changes in radial displacement relative to normal conditions and extracts fault features, proposing a diagnosis method for loose main spoke bolts based on weighted root mean square error. Experimental results from the drum screen's loose main spoke bolt fault detection demonstrate that, during one full rotation of the drum screen, the root mean square error in the radial displacement data significantly increases in the fault region compared to normal conditions. The proposed diagnostic method not only identifies loose bolt faults but also accurately locates the loose main spoke, providing a feasible approach for diagnosing loose main spoke bolt faults in drum screen.