Dynamic Characteristics Analysis of Vibrating Screen Based on System and Particle Coupling Dynamics

doi:10.12141/j.issn.1000-565X.220104

Abstract

Abstract:

In order to analyze the interaction between the vibration of vibrating screen and the movement of particles and reveal the influence of vibration parameters on the dynamic characteristics of the system, this paper establishes a model for the coupling of vibration sieve system dynamics and particle dynamics. By using this model, real-time bi-directional coupling simulation of screening process can be realized, and the accuracy of the simulation model is effectively improved. The steady-state particle distribution at each layer of screen is obtained based on the actual screening yield which is calculated in terms of screen test. As compared with the uncoupled model, the model considering the coupling of vibrating screen and particle dynamics can obtain more accurate force analysis, and enhance the material throwing of the sieve body, avoiding the particle accumulation of each layer in the traditional simulation, which is more consistent with the actual screening situation. Meanwhile, the coupling analysis also indicates that the maximum impact force of materials does not decrease as the number of screen layers decreases. Finally, the variation law of material impact force with the main parameters of vibrating screen is studied. The results indicate that the impact force of the particles not only varies as the proportion of screen surface area, but also relies on the residence time of the particles on the screen; the impact force of the particles decreases with the increase of the inclination angle of screen surface. When the vibration direction angle is within 57°to 90°, the magnitude of the impact force shows an inverted V-shape. The results provide a theoretical guidance for the dynamic optimization design and noise reduction of vibration screen.

Key words: construction machinery, dynamic characteristic, coupling simulation, vibrating screen, particle dynamics

CLC Number:

TH113.1

HE Zhaoxia, WANG Xingzhe, XING Zengfei, et al. Dynamic Characteristics Analysis of Vibrating Screen Based on System and Particle Coupling Dynamics[J]. Journal of South China University of Technology(Natural Science Edition), 2023, 51(1): 41-50.

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物料粒径/mm	物料级配比/%	生产速率/（kg·s^-1）
25.6	7	7.78
20.8	20	22.22
14.4	15	16.67
8.8	20	22.22
4.8	8	8.89
2.4	30	33.33

网孔尺寸/（mm×mm）	丝径/mm	有效网孔尺寸/（mm×mm）
26.5×26.5	3	23.5×23.5
21×21	2	19×19
14×14	2	12×12
9×9	2	7×7
6×6	2	4×4

颗粒模型	颗粒形状	颗粒比例/%	颗粒模型	颗粒形状	颗粒比例/%
	针状体	20		五面体	25
	四面体	30		六面体	25

筛网层数	T_s/s	F_s/N	一倍频程幅值/N
1	4.8	6 008	1 376
2	5.2	7 582	1 775
3	5.0	4 128	905
4	5.4	6 748	1 544
5	5.0	3 506	829

筛网层数	筛网冲击力/N		筛面颗粒物重量/N
筛网层数	耦合	未耦合	筛面颗粒物重量/N
1	6 008	6 477	6 241
2	7 582	3 577	6 116
3	4 128	2 626	4 574
4	6 748	4 457	7 056
5	3 506	5 004	3 700