Material mixing in a rotating drum is a complex movement process, and the material mixing uniformity impacts product quality. The mixing of sand and gravel in the rotating drum was simulated by the discrete element method to study the quantitative relationship between the mixing uniformity and its influencing factors and analyze the mixing performance. The quantitative relationships between mixing uniformity and rotation speed of the rotating drum, material filling rate, and distance of rods inside the rotating drum were established based on the response surface method. Results indicate that the rotation speed of the rotating drum has the most significant influence on the mixing uniformity, followed by the distance of rods inside the rotating drum, and the material filling rate has a minor influence on the mixing uniformity. The interaction between the three factors significantly affects the mixing uniformity. The areas where the particles move in the rotating drum are divided into active and inactive areas. Rods inside the rotating drum can accelerate the movement of the particles in the inactive area, relieve particle segregation and promote particle mixing.

物料在转鼓内的混合是一个复杂的运动过程，物料混合均匀度影响产品质量。采用离散元方法对砂石在转筒内的搅拌进行模拟，研究搅拌均匀度及其影响因素之间的定量关系，分析搅拌性能。基于响应面法建立了混合均匀度与转鼓转速、物料填充率、转鼓内杆间距等的定量关系。结果表明，转鼓转速对混合均匀度影响最显着，其次是转鼓内杆的距离，物料填充率对混合均匀度影响较小。三个因素之间的相互作用显着影响混合均匀度。颗粒在转鼓内运动的区域分为活性区和非活性区。转鼓内的棒可以加速非活性区颗粒的运动，缓解颗粒偏析，促进颗粒混合。