【作者】 申树云；

【导师】 董玉平；

【作者基本信息】 山东大学 ， 机械设计及理论， 2008， 硕士

【摘要】 为了实现生物质资源规模化利用,国内外目前采用的行之有效的办法之一就是生物质固化成型技术,该技术就是将农作物秸秆、稻壳、锯末、木屑等生物质废弃物,在一定的温度、湿度和压力下,使原来松散、无定形的粉碎原料压缩成具有一定形状、密度大、能量度高的固体成型燃料。针对目前生物质环模辊压式成型机仅处于某些方面的试验阶段,未从理论上进行研究,本文首次在成型理论和环模温度场分布等理论方面进行了深入研究与探讨,为进一步研究环模辊压式成型机提供了一定的理论依据。采用实体造型、有限元网格划分、有限元模拟全过程的模型及应用方法,借助Pro/Engineer特征创建技术、对话框技术,在Pro/Engineer环境下采用旋转、切除、阵列等特征实现了环模的三维建模。通过ANSYS软件中的THERMAL模块中的solid70单元对成型过程中环模的温度场进行数值模拟,揭示了成型过程中环模的温度场分布规律。基于温度场求解时对材料热物性参数取值、初始条件、边界条件等处理原则,利用分块模型化的特点,选取环模1/36模型进行有限元分析在ANSYS中选取Thermal to Struct直接把THERMAL模块转化为结构分析模块。首次对环模进行结构静力学、结构动力学、结构热耦合数值模拟,揭示了环模的应力场、应变场、位移分布规律。研究了环模结构参数对环模应力分布的影响,重点探讨了参数长径比对环模应力的影响。模拟结果显示长径比为5∶1时应力最小,与相关资料报道吻合。本文对环模辊压式成型机核心工作部件环模的数值模拟结果为优化环模材料选择、制造工艺控制缺陷、保证模具强度、提高模具寿命提供了科学依据,对环模辊压式成型机的研究与生产都有很好的应用价值和参考价值,对于加工生物质环模辊压式成型机的研究方法是一次突破和有意义的尝试。更多还原

【Abstract】 In order to achieve large-scale biomass resources utilization, Presently one of the effective ways is the Biomass Briquetting Technology at home and abroad. The technology can compress crop stalks, rice hulls, sawdust, wood chips and other biomass waste into a certain shape, density, and high erergy solid fuel in a certain temperature, humidity and pressure.Currently study on the loop die roll-forming machine is only in certain aspects of the pilot phase, not in theory study, this paper has firstly done an in-depth study and discussion of the biomass pelletizing theory, temperature distribution of the loop die and and other theoretical issues, and provides a certain theory for further study the loop die roll-forming machine. Used solid modeling, finite element mesh generation, finite element simulation of the entire process of the model and its application method, in virtue of the create feature technology and the dialog technology of Pro/Engineer, the loop die 3D model is created by rotation, excision, array and others in the Pro/Engineer. This paper simulates the loop die temperature in the processing of briquetting by the solid70 of THERMAL of ANSYS and acqueires the distributing of temperature. Based on the disposing principle of the material thermal properties parameters, the initial conditions, the boundary conditions etc. in solving temperature, using the characteristics of the block model of ANSYS, the paper simulates the 1/36 model. By selecting Thermal to Struct, ANSYS translates the thermal module into the struct module. The paper firstly does simulation of the structural static, structural dynamic and structural thermal coupling analysis and finds the distribution of stress, strain and displacement of the loop die. The paper also studies on the infection of the loop die structure parameters on the stess distribution, and focuses on the infection of the length-diameter ratio on the stress. Simulation results show that the stress is minimum when the length-diameter ratio is 5:1, inosculating with that the relevant information reports.In this paper, the simulation results provide a scientific basis for the optimization of loop die material, the manufacturing process control deficiencies, the ensuring loop die strength and the postponing loop die life. The results are very good application value and reference value for the research and production of loop die, also are a breakthrough in research methods and meaningful attempt.更多还原