摘要
为了实现卧式连续混合机内膨润土与铁精矿混合过程的动态描述,明确混合机关键部件(搅拌装置)的受力特性,基于离散单元法,采用Hertz-Mindlin模型构建膨润土与铁精矿的混合料颗粒模型,在ANSYS-DesignModeler平台中建立混合机物理模型,通过EDEM软件进行不同转速下的物料搅拌混合模拟,对颗粒物料混合流场与速度场进行详细分析,并将物料混合结束后的作用力通过EDEM-ANSYS Workbench接口加载到搅拌机构上,在ANSYS Workbench环境下得到混合机关键部件的受力情况。分析结果表明:在物料混合过程中,引入离散单元法具有可行性和可操作性;中间搅拌叶片对物料的搅拌作用最大,受力明显,变形最大,但应力应变均远小于材料的屈服极限,搅拌机构安全可靠。
In order to dynamically describe the mixing process between bentonite and iron concentrate in the horizontal continuous mixing machine and to determine the mechanical characteristics of the key components （mixing device） of the mixer, the mixing flow field and velocity field of the particulate material were analyzed in detail. Based on the discrete element method, the Hertz-Mindlin model was used to construct the particle model of bentonite and iron concentrate. The physical model of the mixer was established in ANSYS-DesignModeler platform. EDEM software was used to simulate the mixing of materials with different speeds. The force after the mixing of the material was loaded on the mixing mechanism through the EDEM-ANSYS Workbench interface. The stress situation of the key component of the mixer was obtained under the ANSYS Workbench environment. The results show that the discrete element method has the feasibility and operability in the mixing process simulation analysis. The middle stirring blade has the most stirring effect. The stress of the middle blade is obvious and its deformation is the biggest, but the stress is far less than the yield limit of the material. The stirring mechanism is safe and reliable.
出处
《机械工程与自动化》
2017年第5期139-141,共3页
Mechanical Engineering & Automation
关键词
离散单元法
连续式混合机
可靠性分析
数值模拟
discrete element methods continuous mixer
reliability analysis
numerical simulation
