An Improved Hopper-Chute System for Electrostatic Testing of Energetic Powders

Electrostatic accumulation in energetic powders can trigger combustion or explosion, creating severe safety risks in industrial processes. Accurate measurement of electrostatic accumulation is critical to exploring electrostatic generation mechanisms and implementing effective control. However, conventional techniques lack sufficient accuracy and automation, undermining the reliability and testing efficiency. This work introduces an improved hopper-chute assembly equipped with a real-time mass detection link, automated feeding, and an adjustable-angle chute platform with interchangeable friction materials. The integrated mass sensor eliminates charge underestimation by accounting for powder loss during testing, and automated workflows cut down manual errors and testing cycles. RDX validation confirms this setup delivers results that are 0.2-1 nC/g higher than traditional methods, as it corrects for unaccounted powder loss, reflecting actual electrostatic accumulation more accurately. We further apply this device to analyze CL-20’s electrostatic behaviors, revealing key influencing factors. This advancement provides a robust tool for energetic material electrostatic testing, supporting optimized safety strategies in production and handling.