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| Influence and optimization of ultra-fine classification grinding disc structure on flow field in crushing chamber |
| QI Xijuan，JIANG Lei，QIN Zhiying，ZHAO Jifu，ZHAO Yuejing |
| （School of Mechanical Engineering ,Hebei University of Science and Technology, Shijiazhuang 050018, China） |
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Abstract In the processing of non-metallic materials, the ultra-fine classification mill is an ultra-fine powder prep‐
aration equipment which integrates ultra-fine grinding and classification, whose principle is to make use of the
high-speed rotation of the grinding chamber. The material in the grinding chamber has a fierce impact and collision
with the blade on the grinding disc, and it is crushed under the dual action of machinery and air flow. The study of
the mechanical structure, flow field distribution and its influencing factors in the crushing chamber has important
engineering significance to ensure the ultra-fine grinding particle size and improve the grinding efficiency. In this
paper, the flow field of ultra-fine classification mill is numerically simulated by computational fluid dynamics soft‐
ware Fluent, and the flow field distribution is observed by single factor experiment. The experimental results show
that the change of the number and width of the blade on the grinding disc has little influence on the air flow veloci‐
ty in the grinding chamber, but has a great influence on the air pressure and axial velocity in the grinding chamber.
The movement of the material entering the grinding chamber is not fully dispersed to the grinding area, which is
easy to cause agglomeration. The structure of the grinding disc in the grinding chamber is optimized by using the
simulation results, and the optimization results are verified.
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Received: 06 March 2023
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Corresponding Authors:
赵月静（1974—），女，硕士，教授，主要研究方向为机械测试技术与系统动力学。
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2024, Vol. 34 
