The construction of this production line is to transform the local abundant limestone resources into higher value sand and gravel products through the complete set of sand and gravel production equipment of Xingaonai Heavy Industry, and to provide a stable supply of high-quality sand and gravel aggregates for the mixing station. This project is a limestone crushing and sand making process. The heavy hammer crusher is used in the coarse crushing stage, and the light hammer crusher is used in the medium crushing stage. After screening, it is transported to the finished aggregate pile, and the substandard ones are returned to the light hammer crusher for fine crushing again.