Abstract:

Achieving thermosetting plastics ultra-fine grinding is the prerequisite for efficient recycling. In order to study the flow field patterns of thermosetting plastics during the process of crushing, through simplifying the internal cavity grinder model, ignoring the impact of particles, using the theory of computational fluid dynamics, and applying model of RNG k-ε turbulence and the algorithm of SIMPLER the N-S equations of gas was solved,In connection with several different options of cutter grinder cavity structure, wall structure, and mill speed, the pressure field and velocity field of the cutting shredders were analyzed via numerical simulation, and making the triple helix cutter and ladder wall structure as an experimental test plane. The results show that material can get very small particle under this condition. Tests show that material can get very small particle under the condition and it also generates the free basic particle during the process of grinding, meanwhile the condition of milling group during the process of sampling is found.

Key words: thermosetting plastic, shear shredder, fluid field, numerical simulation, milling group

摘要：

超细粉碎是实现热固性塑料高效回收的前提,为了研究粉碎机腔内的流场变化对粉碎效果的影响,简化了粉碎机腔的内部模型,并忽略其颗粒的影响,采用RNG k-ε双方程湍流模型和SIMPLER算法求解气相的N-S方程,针对粉碎机腔内的刀齿结构、内壁结构及粉碎机转速的几种不同方案,分析了数值模拟获得的粉碎机腔内的压力场和速度场,确定三螺旋刀齿和阶梯内壁结构作为试验专机设计方案进行试验,结果表明：物料在该条件下的粉碎能达到很小的粒径,粉碎过程中生成了自由基团,取样观察发现了团聚现象。
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关键词: 热固性塑料, 剪切粉碎机;流场;数值模拟;团聚