To address the challenges of the large number of idlers on belt conveyors, confined spaces, and difficulty in wiring, the idler detection sensor features a compact, low-power design. It establishes its own wireless network to monitor in real time and autonomously analyze trends in idler operating temperature and speed. This replaces manual inspections and enables automatic warnings, preventing belt wear and fire hazards caused by idler rotation lag or jamming, thereby ensuring the stable operation of belt conveyors.