基于有限元法的BF142型刨花振动筛结构强度分析

振动筛作为刨花筛选工序中占有量最多的筛分机械,其结构强度、刚度决定了整个振动筛设备的工作性能.针对BF142型刨花振动筛筛箱支撑主梁容易发生裂纹破坏、使用寿命短等问题,采用SolidWorks三维建模和ANSYS有限元仿真分析方法,对BF142型刨花振动筛进行模态分析以及瞬态动力学分析,并应用动态测试装置测试筛体在正常...

Structural strength analysis of BF142 particle swing screen based on finite element method

Vibrating screen is the most important particle screening machine in the particleboard production,and its structural strength and stiffness determine the working performance of the whole vibrating screen equipment.Due to the needs of the industrial era,the vibrating screen equipment is developing towards large-scale,but when the structure size of the vibrating screen increases,the dynamic load of the box increases,and the requirements for its strength also increase accordingly,which leads to the lack of structural stiffness and strength of the screen body.As a result,the excessive deformation of the screen body and cracking of the side plate will occur,which seriously affects the safety operation of screening.In this study,aiming at solving the problems of crack damage and short service life of the main girder of the support box of the BF142 type particle swing screen,the modal analysis and transient dynamic analysis of the BF142 type particle swing screen were carried out using the SolidWorks three-dimensional modeling and ANSYS finite element simulation analysis method,and the dynamic stress and strain of the screen body under normal working conditions were tested using the dynamic testing device.The modal analysis was conducted through the analysis of the first six natural frequencies.The results showed that the working frequency of the vibrating screen avoided the natural frequency of the vibrating screen,and the resonance phenomenon would not be developed in the working process.By comparing the transient dynamic analysis results with the test results,the average absolute error of strain was 2.6με,indicating that the simulation results had high accuracy.The results of transient dynamic analysis showed that the maximum equivalent stress peak would appear when the screen box moved to four limit positions in the X and Y directions in a period of stable operation,and the maximum stress peak would appear when the screen box moved to position b.At this time,the maximum stress appeared at the position above the leg mounting plate corresponding to the left vertical beam,and the maximum value was 79.4 MPa.Taking the upper side of the left and right outrigger mounting plates as the interface,the upper and lower parts of the interface formed complex deformation in different combinations.The dynamic analysis results showed that the maximum stress position of the structure was consistent with the actual failure position of the equipment.The finite element analysis results could predict the stress distribution of the vibrating screen,which provided a certain reference for the structural optimization design of the vibrating screen,especially for the stability and reliability design of the large vibrating screen.