物料装载工况刮板输送机纵扭耦合振动分析

为提高刮板输送运行可靠性,研究了刮板输送机纵向与扭摆耦合振动特性。基于Voigt模型和逐点张力法建立刮板链条体系的扭摆振动分析模型,研究货载激励作用下激励作用点前后方有无物料的刮板链条体系扭摆振动特性。以求解可靠性和精度为前提,研究物料装载工况的扭摆振动影响区域和衰减特性,确定沿线不同区段扭摆振动单元的刮板最大数量,构建扭摆振动缩略模型。建立刮板链条体系的纵向与扭摆耦合振动力学模型,研究货载激励作用下刮板链条体系纵向与扭摆振动特性。理论和实验研究表明:物料装载工况下,货载激励引起激励施加处最大值为119.5%的刮板速度波动和78.6%的张力波动;在货载激励单元区段内两根链条的张力差最大为8.6%,并且初始时刻无物料情况下,货载激励引起的扭摆振动更明显。

Analysis of Longitudinal and Torsional Pendulum Coupling Vibration of Scraper Conveyor Under Material Loading Condition

In order to improve the operational reliability of scraper conveyer, the coupling vibration characteristics between longitudinal and torsional pendulum of scraper conveyor are studied. Based on Voigt model and point-to-point tension method, the torsional vibration analysis model of scraper chain system is established. The influence area and attenuation characteristic of torsion pendulum vibration under material loading condition are studied. Based on the premise of solving reliability and precision, the maximum number of scraper plates of torsion pendulum vibration units in different sections along the line is determined, and a torsional pendulum vibration abbreviated model is constructed. The dynamic model of longitudinal and torsional pendulum coupling vibration of scraper chain system is established to study the longitudinal and torsional vibration characteristics of scraper chain system under load excitation. Theoretical and experimental studies show that: The maximum fluctuation of the speed and the tension of the scraper are 119.5% and 78.6%, respectively, in imposition of incentives caused by cargo incentive. The tension difference of two chains in the load excitation section is up to 8.6%, and torsion vibration caused by load excitation is more obvious under no material circumstances in the initial time.