The rocks are evenly fed into the jaw crusher through the feeder. After the initial crushing, the semi-finished products are transported by the belt conveyor to the impact crusher for further crushing. After the secondary crushing, the stones of different specifications are screened out by the belt conveyor to meet the customers' demand for the particle size of the sand and gravel pile. The unqualified materials are transported to the finished products by the belt conveyor and returned to the impact crusher for re crushing, Form a closed loop.