关键词: 沙柳细枝颗粒, 环模楔形区域, Fluent, 运动速度, 压力

Abstract: Ring molding machine is the main equipment of biomass compression molding machine. Its internal material movement characteristics is not easy to be measured due to its complexity. This paper studied the movement velocity and pressure of crushed salix twig particles inside of ring moulding machine. Based on the theory of rheology, the paper established a velocity equation for the material in the wedge area of the machine, simulated its plastic flow with software Fluent, and used dynamic grid technique & UDF to move the ring die and press roll in the simulation. Then the velocity vector, velocity and pressure color nephogram of the particles in the wedge area were obtained. The former was used to analyze material movement direction in this area. By changing the minimum clearance, diameter ratio of the ring die & press roller and die orifice diameter, the latter obtained different color nephogram, which was used to analyze the movement velocity, pressure distribution and influence on material forming process. Through comparison, it was found when the ring moulding machine, minimum clearance was 2.0 mm, diameter of die orifice was 10 mm, and diameter ratio of the ring die & press roller was 2.25, the compact molding effect and efficiency of the salix twig particles were better. The above results provided theoretical support and method reference for studying movement characteristics of the other biomass material in the wedge area of ring moulding machine.

Key words: salix twig particle, edge area of ring moulding, Fluent, movement velocity, pressure