一种小型多层圆形振动式粒度仪的筛分效率  

Screening efficiency of a small multi-layer circular vibrating granulometer

作　　者：何召慧 时运来[1] 王君涵 郭佳鑫 HE Zhaohui;SHI Yunlai;WANG Junhan;GUO Jiaxin(State Key Lab of Mechanics and Control for Aerospace Structures,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)

机构地区：[1]南京航空航天大学航空航天结构力学及控制全国重点实验室,江苏南京210016

出　　处：《中国粉体技术》2025年第2期112-121,共10页China Powder Science and Technology

基　　金：国家自然科学基金项目,编号:51975282。

摘　　要：【目的】研究振动式粒度仪的振动频率、振幅等因素对石英砂颗粒和河沙颗粒筛分效率的影响。【方法】设计一款小型多层圆形振动式粒度仪,使用RockyDEM仿真软件模拟振动式粒度仪筛分石英砂颗粒和河沙颗粒的过程;通过调节粒度仪振动筛分装置的振幅、频率等参数,计算在一定时间内不同筛分振幅和频率下颗粒的筛分效率;最后通过实验对2种颗粒的筛分效率进行测试。【结果】振动频率为75~105Hz、振动幅度为0.1~0.2mm时石英砂颗粒和河沙颗粒的筛分效率最高;在仿真结果最优频率及幅值范围内,该振动筛分装置的效率较高,对2种颗粒的筛分效率均大于90%。【结论】研究小型多层圆形振动筛分装置的筛分效率,能够有效缩短振动式粒度仪筛分的时间且达到更高的筛分效率,避免振动筛分装置的筛分效率低导致的能源浪费。Objective The screening efficiency of a vibrating particle size analyzer is a key indicator of its effectiveness in particle size sepa-ration.However,there has been limited research on the screening efficiency of small multi-layer circular vibrating screen particle size analyzers under different vibration parameters.This study investigates the impact of vibration frequency,amplitude,and other factors on the screening efficiency of quartz sand and river sand particles,aiming to identify the optimal vibration parameters that maximize particle screening efficiency and improve the energy utilization of the device.Methods A small multi-layer circular vibrating particle size analyzer was designed,using mechanical vibrations to separate particles through six layers of standard circular sieves.The core functional module of the analyzer was the vibrating screening device,consisting of a voice coil motor as the vibration source,springs,a fixed base plate,and a top plate forming a complete vibration system.The voice coil motor offered the advantages such as fast response and convenient control,allowing parameter adjustments of vibration frequency and excitation force through a device drive controller.Rocky DEM simulation software was employed to simulate the screening process of quartz sand and river sand particles.Parameters such as vibration amplitude and frequency were adjusted in the motion settings of the software,while material properties of each structural part of the device and contact parameters between particles and the sieve,as well as between particles themselves,were configured in the software material database.The screening efficiency of particles on the first and sixth layers of the sieve under various amplitudes and vibration frequencies over a certain period was calculated,producing efficiency curves as a function of these parameters.Experi-ments were conducted by measuring the vibration amplitude of the voice coil motor under different excitation forces and frequen-cies using a laser vibrometer.Screening e

关 键 词：粒度仪 小型多层圆形振动筛 离散单元法仿真 筛分效率 

分 类 号：TH-39[机械工程] TB4[一般工业技术]