Analysis And Optimization Of Vibration Characteristics Of Ring Mold Granulator

Because of its higher productivity, lower pollution and energy-efficient, ring die pellet mill has been widely used in biomass-energy, feed and chemical industry. However, the existing machine have serious vibration. Therefore, the vibration and optimization of ring die pellet mill was studied in this article. The main work can be accomplished as follows:(1) The interaction force between roller and ring die was figured out in this article. The relationship of the interaction force and the thickness of materials was studied, and also the relationship of the interaction force and the relative displacement between roller and ring die. The dynamic forces model of compaction region was built up in this article. Numerical investigation into the influence of mould shape on the pulverulention of pellet and the structure optimization was done based on DPC model.(2) According to the structure figure, transmission system and the loads of ring die pellet mill, the multi-body dynamics model was developed in this article. Furthermore, the analysis of the modal information was done in this article, and the structure design, manufacturing and assembly process of ring die pellet mill was optimized.(3) The formula fitting power spectral density curve of material unevenness was built up. Based on harmony superposition method, the time series sample of the material thickness in compaction region was obtained and discretized as input data for dynamic model. The random vibration of ring die pellet mill was studied based on the dynamics model. The main reason of vibration and the optimal methods for strengthening the support system were discussed. The dynamic behavior of ring die pellet mill with reinforced supporting system or flexible bar were studied. A new spreading machine was designed to reduce the material unevenness in compaction region and prevent stoppage state.(4) Parameterized simulation model of ring die pellet mill was set up, and simulations were done to study the vibration of ring die pellet mill with rotor eccentricity. The results reveal that it is positive to increase the dead axle diameter and the stiffness of frame to reduce the vibration of machine. The flexible bar can be used to fix the rollers on dead axle in order to reduce the vibration of ring die pellet mill. The bearing spacing of revolving shaft can be obtained an ideal value according to the stiffness of bearings.