散粒农业物料孔口出流成拱机理分析

The Mechanism Analysis of Flowing Agricultural Particle Material Arching in Hole

本文对散粒农业物料孔口出流落粒拱形成的影响因素进行了分析讨论。根据微观力学原理,建立了颗粒成拱的力学模型;并计算了颗粒物料在孔口出流时形成落粒拱的临界条件。导出了粒径与临界孔口直径、拱高之间的关系。在试验的基础上,找出了物料粒径、含水率与临界孔口直径之间的变化规律。对农产品及食品加工机械的设计提供理论依据以及对今后进一步研究有一定意义。

The influences of flowing agricultural particle material arching in hole are discussed in this paper. The arching mechanical models are developed on the basis of micromechanical priciple. The critical arching condition of flowing particle material in hole is analysed as well. The relationships of the particle size, critical hole diameter and arch highness are derived. The patterns of relationship between the size and moisture of particle and critical hole diameter are estiblished based on the experiments and thus information is provided for the design of agricultural material and food mechinery, as well as for the furture research.