输送带纵向振动对多驱动驱动力分配影响的研究

带式输送机运行过程中,输送带所受的动张力沿输送带运行方向以波的形式传播,并在传播的过程中产生纵向振动,输送带较大的纵向振动会影响多滚筒驱动力的分配。本文以Kelvin-Voigt黏弹性模型作为输送带力学模型进行分析,由输送带的本构方程建立长距离带式输送机输送带纵向振动驱动力分配方程,以天津港某条头部双滚筒驱动长距离带式输送机为例,仿真启动过程中驱动滚筒的驱动力变化曲线及输送带振动曲线,将仿真结果与试验结果相比对,得到对于头部双滚筒驱动的带式输送机系统,随着输送带弹性模量的增大输送带振动减轻,双滚筒驱动驱动力的分配更加接近理想的功率配比的结果。研究结论为输送带的合理选型提供可靠依据,并能使电机工作在设计工作点附近,避免因驱动力分配不均而烧毁驱动电机。

Effects of longitudinal vibration of conveyor belt on multi-driving force distribution

In running process of a belt conveyor,the dynamic tension of conveyor belt propagates in the form of wave along the running direction of belt,and produces longitudinal vibration in process of transmission.The larger longitudinal vibration of belt can affect the distribution of driving force of multiple rollers.Here,Kelvin-Voigt viscoelastic model was taken as the mechanical model of conveyor belt,and the distribution equation of driving force for longitudinal vibration of long-distance belt conveyor was established based on the constitutive equation of conveyor belt.Taking a certain long-distance belt conveyor driven by its head double-drum in Tianjin Port as an example,the driving force variation curve of driving drum and the vibration curve of conveyor belt in start-up process were simulated.The simulation results were compared with test ones.It was shown that for the belt conveyor system driven by its head double-drum,with increase in elastic modulus of conveyor belt,vibration of belt is reduced,and driving force distribution of double-drum drive is closer to the ideal power ratio;the study results can provide a reliable basis for rational selection of conveyor belt,and make the motor work near the design work point to avoid burning the drive motor due to uneven driving force distribution.