Analysis On Fatigue Life Of Liner Vibrating Sieve

Linear vibrating sieve is widely used in mining, coal, metallurgy, building materials, chemical industry etc., for materials selection, dehydration, grading etc., due to its simple structure, strong vibration intensity, high screening efficiency and processing capacity etc.. However, the body has to bear a larger alternating excitation force at higher vibrating frequency, so it often appears fatigue damage such as cracking of the lateral plate and beams in practical work, which is seriously affecting production. Especially with the development of vibrating sieve towards large-scale direction, fatigue damage is becoming more severe. It is urgent to improve the fatigue life of the reliability of products in the design stage.Traditional prediction of fatigue life focuses on specific physical prototype tests, which is a waste of manpower, materials and financial resources. Moreover, if the physical prototype test fails, it is need to re-design the product and check errors until success, result in substantial increase in development and test costs. With the development of computer technology, especially the dynamics simulation and finite element technology, it becomes possible to be applied in product fatigue life analysis, overcoming the shortcomings of the traditional test methods.Based on some linear vibrating sieve, this paper analyses fatigue life of the beams and lateral plate according to a large number of virtual fatigue durability integrated simulation methods at home and abroad. Firstly, 3-D models of sieve parts are established,assembled and checked interference by Pro/E. Secondly, the multi-rigid-body dynamics model of vibrating sieve is established through MSC.ADAMS, and the simulation analysis is carried on, obtaining displacement, velocity and force, etc., which provides a rigid model for the rigid-flexible coupling dynamic analysis of the beam and lateral plate. Thirdly, free modal analysis is carried on through finite element processor MSC.PATRAN and solver MSC.NASTRAN respectively, acquiring the natural frequencies and natural mode of vibration, which provides the modal information and flexible body for fatigue life analysis. Then, the rigid-flexible coupling dynamic model is established with the beam and lateral plate being the flexible body, the other parts the rigid body in MSC.ADAMS, which provides modal displacement for the load spectrum for fatigue life analysis. Finally, the beam and lateral plate are analyzed by using modal stress recovery method in fatigue analysis software MSC.FATIGUE, according to the material S-N curve, in order to obtain the fatigue life of Moire figure and structure of dangerous position. The result of the fatigue life analysis is in accordance with actual damage, indicating it is feasible for the virtual fatigue durability integrated analysis system to be applied in vibrating sieve fatigue life analysis, which can reduce the number of physical prototypes, shorten the development cycle of products, reduce development costs and improve market competitiveness. At the same time, this paper has a certain reference value for further studies on the reliability of the vibrating sieve.