关键词: 振动筛筛箱, 有限元, 模态特性, 动强度校核

Abstract: Based on practical experiences and comprehensive analysis of vibration screen system, a parameterized finite element model of Vibrating Screen Box was set up by a 3D software and the related issues in modeling were also discussed. The first 14 step natural frequencies and its relevant normal modes of the screen box were gained by modal analysis of the vibrating screen box. The distribution rule of all the nodes displacement and dynamic stress were identified by harmonic response simulation. Based on the simulation results, the dynamic rigidity and strength of the Vibrating Screen Box were checked. The results showed that the established finite element model of the screen box was well coincide with the actual structure, which also can satisfy the requirements of stress analysis. According to the modal analysis, the natural frequency is not coincident to working frequency, so there would be no resonance occur during work. According to the harmonic response analysis, the dynamic rigidity and strength of the screen box can meet the design requirement. This paper proposed a theoretical basis for designing large-sized and heavy-duty Vibrating Screens.

Key words: Vibrating screen box, Finite element method, Modal characteristic, Dynamic strength check