弧形振动筛主要参数及动态性能的研究

发布时间：2018-08-24 16:02

【摘要】：本课题来源于企业，是国家重点新产品试制计划项目的子项目，项目编号为2008GRC10163，项目目的是对一种新型的弧形振动筛进行研究，研究弧形振动筛的主要参数对筛体运动状态的影响，确定弧形振动筛的主要参数组合，并对弧形振动筛的结构进行动态分析，以优化弧形振动筛结构，提高产品性能，提高筛分效率。本文的主要研究内容及结论体现在以下几方面：首先，分析了物料在弧形筛面上的受力状态，建立了物料在筛面上动力学方程；分析弧形振动筛筛分系统的性能指标：抛掷指数和跳跃指数，及其相互关系；分析弧形筛面的形状结构对透筛效率的影响，设计了弧形振动筛的筛面布置图。其次，分析了弧形振动筛的动力学模型，从理论上建立了弧形振动筛的动力学方程，为弧形振动筛的理论研究提供依据；运用软件仿真研究了弧形振动筛的激振力大小、激振力方向、支撑弹簧刚度和支撑弹簧夹角四个主要参数对弧形振动筛运动状态的影响。得出结论：激振力越大，物料透筛力越大；激振力的方向变化影响弧形振动筛质心速度和加速度的大小；支撑弹簧刚度和支撑弹簧夹角影响弧形振动筛质心的速度和加速度的大小，并且影响其运动周期，合理选择支撑弹簧刚度和支撑弹簧夹角，能有效提高弧形振动筛的筛分效率。然后，运用实体有限元仿真技术，通过正交实验法设计仿真计算方案，通过观察弧形振动筛筛体质心的运动轨迹，，得到当激振力为38kN，激振力与水平面夹角成20度角，支撑弹簧刚度为18.67kg/mm，支撑弹簧夹角成60度，此时，弧形振动筛的工作效率最好，可以更充分地利用激振力的功率，使振动筛的筛分效果更优。振动筛的四个主要参数的变化，均影响振动筛的运动状态，进一步研究单个参数对筛分效率的影响，为确定弧形振动筛的主要参数提供可靠依据。采用优化后的参数组合对实际振动筛进行改进，振动筛的处理能力提高了21%。最后，根据实际的弧形振动筛结构，运用有限元分析计算了弧形振动筛的筛体及其零部件的各阶固有频率和振型，分析其振动特性，并且对弧形振动筛的结构进行了动态设计。
[Abstract]:This subject originates from the enterprise and is a sub-project of the national key new product trial plan. The project number is 2008 GRC10163. The purpose of the project is to study a new type of arc vibrating screen, study the influence of the main parameters of the arc vibrating screen on the motion state of the screen, determine the main parameters combination of the arc vibrating screen, and study the arc vibrating screen. The structure of the sieve is dynamically analyzed to optimize the structure of the arc vibrating screen, improve the product performance and improve the screening efficiency.
The main contents and conclusions of this paper are as follows:
Firstly, the force state of the material on the curved screen surface is analyzed, and the dynamic equation of the material on the screen surface is established; the performance indexes of the screening system of the curved vibrating screen, such as throwing index and jumping index, and their relationship are analyzed; the influence of the shape and structure of the curved screen surface on the screening efficiency is analyzed; and the screen layout of the curved vibrating screen is designed. Secondly, the dynamic model of the arc vibrating screen is analyzed, and the dynamic equation of the arc vibrating screen is established theoretically.
It provides the basis for the theoretical research of the arc vibrating screen, and studies the influence of four main parameters of the arc vibrating screen: the magnitude of the exciting force, the direction of the exciting force, the stiffness of the supporting spring and the angle between the supporting spring. The centroid velocity and acceleration of the arc vibrating screen are influenced by the stiffness of the supporting spring and the angle between the supporting spring, which affect the centroid velocity and acceleration of the arc vibrating screen, and affect its movement period. Rational selection of the stiffness of the supporting spring and the angle between the supporting spring can effectively improve the screening efficiency of the arc vibrating screen. Body finite element simulation technology, through the orthogonal experimental design of simulation calculation program, by observing the body center of the arc shaker trajectory, get when the exciting force is 38 kN, the exciting force and the horizontal plane angle is 20 degrees.
The stiffness of the supporting spring is 18.67 kg/mm and the angle between the supporting springs is 60 degrees. At this time, the working efficiency of the arc-shaped vibrating screen is the best, and the power of the exciting force can be fully utilized, so that the screening effect of the vibrating screen is better. Finally, according to the actual structure of the arc vibrating screen, the natural frequencies of the screen body and its components are calculated by finite element analysis. The vibration characteristics of the vibrating screen are analyzed, and the structure of the vibrating screen is dynamically analyzed.
Design.
【学位授予单位】：江南大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH237.6

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