考虑圆管输送带弹性的托辊组动态接触力特性分析

Dynamic contact force analysis considering pipe conveyor belt elasticity

托辊组作为圆管带式输送机中强制输送带形成圆管状的关键零部件,目前仍主要通过取较大的安全系数进行传统设计,容易因许用载荷设计不合理而导致实际运行过程中部分托辊过早疲劳失效。以某型圆管带式输送机为例,通过考虑圆管输送带的弹性,建立圆管输送带-托辊组刚柔耦合动力学模型,分析匀速和匀加速两种典型工况下托辊接触力的变化,与没有考虑输送带弹性的刚体动力学模型结果进行对比,得出不同位置处的托辊接触力平均值减小约80%,而波动变化值高达4倍以上,产生幅值较大的交变载荷,致使托辊疲劳失效。最后结合实验对基于刚柔耦合模型的匀速工况分析结果进行验证。实验结果可为满载工况下托辊载荷及疲劳寿命研究提供参考。

Roller groups as the key part of pipe belt conveyor,it forces belt wrapped into round tube in operation. At present,the design of roller mainly through empirical formula,taking bigger safety coefficient to design,which is easily caused some roller premature failure during operation because of the limited load is not reasonable. A type pipe belt conveyor is taken as an example,the coupled dynamic model is set up by considering the conveyor belt elasticity.The contact forces of rollers in constant speed and uniform acceleration are analyzed. Comparing with the rigid dynamic model analysis results,the average value of contact force reduced by approximately 80%,and the fluctuating value increased about more than four times. It developed the larger alternating load to cause fatigue failure easily. At last,the experiment is taken to verify the coupled model analysis results in constant speed.The conclusions can provide a guidance for dynamic load and fatigue life research in full load operation condition.