Abstract: To address the production challenges associated with conventional contact-type chute blockage alarm devices, including poor anti-interference performance, high false alarm rates, and frequent unplanned shutdowns, Huangling No. 2 Coal Mine Preparation Plant compared the adaptability of three non-contact monitoring solutions—ultrasonic, infrared, and radar—under the high-dust, high-vibration, and high-humidity operating conditions of coal preparation workshops. An industrial radar ranging sensor was selected as the core monitoring component, and an intelligent detection and control system based on a Siemens S7-200 SMART PLC was developed, incorporating a time-delay filtering function with an adjustable delay of 1～20 s. The hardware configuration, on-site installation, and industrial trials were subsequently completed.The application results showed that the system operated stably for 12 months, achieving a 100% accuracy rate for chute blockage alarms, with no false alarms throughout the year and no sensor damage during the entire operation period. The duration of unplanned shutdowns caused by false alarms was reduced by more than 98%, resulting in annual savings of approximately 1 million yuan in total production costs. The radar monitoring system requires no direct contact with the material, offers strong adaptability, and is simple to install and retrofit, delivering significant safety and economic benefits. It can provide a mature technical reference for the upgrading of chute blockage monitoring systems in similar coal preparation plants. In the future, the system can also be integrated with the Industrial Internet of Things to enable blockage trend prediction and early-warning functions.