约束型活动挡板对滚筒内特定二元颗粒混合过程的影响

Influence of constrained moving baffle on particle mixing in rotating drum

为了改善颗粒的混合效果,提出在滚筒内增设自由型活动挡板和约束型挡板的方案,利用自行设计的实验装置探究不同滚筒转速下挡板形状、挡板尺寸、约束绳长度和约束绳弹性对颗粒混合的影响,并根据混合指数指标来判别不同变量条件下不同直径颗粒的混合效果。结果表明:当滚筒转速为30 r/min时,自由型活动挡板与约束型活动挡板均起到促进颗粒混合的作用。改变挡板形状,正方形挡板起到的混合效果最明显。以约束绳的弹性为变量时,非弹性约束绳情况下的颗粒混合效果较好。当转速提高至60 r/min,只有长度为80 mm的十字形约束型活动挡板对滚筒内颗粒混合起到促进作用。

In order to improve the mixing effect of particles,this paper proposed to add free moving baffle and constrained moving baffle in self-designed rotating drum.The effects of baffle shape,baffle size,restrained rope length and restrained rope elasticity on the mixing of particles at different rotational speeds were investigated.The intensity of segregation was used to determine the mixing effect of binary particles.The results show that both the free moving baffle and the constrained moving baffle promote the particle mixing when the rotational speed is 30 r/min.In the experiment of changing the shape of the baffle,it is found that the square baffle play the most obvious mixing effect.The particle mixing effect is better in the case of non-elastic restrained rope than elastic one.When the rotational speed increase to 60 r/min,it is found that only the 80 mm cross-shaped constrained moving baffle promotes the mixing of particles in the rotating drum.