基于离散元法的双组份复合涂料搅拌螺杆参数优化

Parameter optimization of stirring screw for two-component composite coatings based on discrete element method

为了提高双组份复合涂料的混合均匀度,对搅拌螺杆的参数进行优化。以混合销钉式搅拌螺杆为对象,建立其三维模型后导入EDEM软件,然后基于离散元法对双组份复合涂料在该搅拌螺杆中的搅拌过程进行仿真分析,研究了螺杆的转速、螺距和长径比对混合均匀度的影响。最后通过单轴压缩实验对螺杆参数优化后的搅拌效果进行了对比验证。结果表明:螺杆转速、螺距和长径比分别通过改变颗粒抛撒程度、螺旋叶片间隙和螺杆长度来影响复合涂料的混合均匀度;稳定出料后,螺杆转速为200 r/min、螺距为80 mm、长径比为5.57∶1时的搅拌效果最佳;实验验证了利用优化后搅拌螺杆搅拌时复合涂料的力学性能优于手工搅拌时的。研究结果可为自动化搅拌螺杆的结构设计和参数优化提供理论依据。

In order to improve the mixing uniformity of two-component composite coatings, the parameters of stirring screw were optimized. Taking the mixed pin type stirring screw as the object, its three-dimensional model was established and imported into the EDEM software. Then, based on the discrete element method, the stirring process of two-component composite coatings in the stirring screw was simulated and analyzed, in order to study the effects of rotation speed, pitch and aspect ratio of screw on the mixing uniformity. Finally, the uniaxial compression experiment was conducted to compare and verify the stirring effect after optimization of screw parameters.The results showed that the mixing uniformity of composite coatings was affected by the rotation speed, pitch and aspect ratio of screw through changing the particle dispersion, screw blade gap and screw length, respectively;after stable discharge, when the screw rotation speed was 200 r/min, the pitch was 80 mm, and the aspect ratio was5.57∶1, the stirring effect was the best;the experiment verified that the mechanical properties of the composite coatings when stirred by the optimized stirring screw were better than those when stirred by hand. The research results can provide a theoretical basis for the structural design and parameter optimization of the automatic stirring screw.