Vibration Analysis and Structural optimization of Ring Die Pellet Mill with Rotor Eccentricity

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Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (24) : 59-65.

Shen Jiangfei, Wu Kai, Cui Xian’an, Sun Yu

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Abstract

Ring die pellet mill has been widely used in the biomass-energy , feed industry, chemical industry because that ring die pellet mill has a series of advantages, such as a high forming rate, lower pollution, energy-efficient and so on. However, the existing ring die pelleting mills have serious vibration, especially for the pellet mill with rotor eccentricity, and the vibration of ring die would severely shorten the ring die life. According to the powder pressure-density relationship and the pressure distribution in deformation area, the accurate interaction force between roller and ring die was figured out with considering the positive static frictional force on roller surface. The change law of the interaction force between roller and ring die with relative displacement was also discussed. Dynamic simulation model of ring die pellet mill with rotor eccentricity was set up by using the multi-body software, and dynamic simulations were done to study the vibration of revolving shaft, dead axle and compaction force. The results reveal that the interaction force between roller and ring die varies linearly with the relative displacement between roller and ring die. The revolving shaft support segment of dead axle should be stouter than the frame support segment. It is positive to increase the dead axle diameter to reduce the vibration of revolving shaft, but negative to the vibration of compaction force. A flexible bar was used to fix rollers to dead axle in order to solve the problem, and the simulation shows that the optimization can dramatically reduce the vibration of compaction force. The radial stiffness of frame should be kept above 1×107N/m, and the bending rigidity of frame should be kept above 1×105N.m/deg. The bearing spacing parameter can obtain an ideal optimum value for different stiffness of bearings of revolving shaft.

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Shen Jiangfei, Wu Kai, Cui Xian’an, Sun Yu. Vibration Analysis and Structural optimization of Ring Die Pellet Mill with Rotor Eccentricity[J]. Journal of Vibration and Shock, 2016, 35(24): 59-65

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