In the process of coal caving. the basis of identifying coal and rock by the vibration signal is the difference of the tail beam response when coal-rock impacts the tail beam. and the tail beam in the hydraulic support is a complex box structure with multiplate transverse and longitudinal welding. and the response difference of the box structure-based tail beam under the impact of coa... https://smokeysmountainfurnitureoutlets.shop/product-category/nightstand/