综采面输送机刮板链条体系扭摆与纵向振动共生机制研究

The main reason of the chain rupture is the uneven distribution of chain tension and the excessive impact load caused by torsion and lengthways vibration of the full mechanized face conveyor.Project using the scraper and material medium dynamics theory to study theproblems of scraper and materials’ coupling dynamics of rigid-bodies and bulks, determine the synchronous and through running state criterion of them, building load incentive model; Study the flexural characteristics of conveyor and the contactcollision problembetween scraper and central slot, build conveyor line form incentive model;By using the theory of impact dynamics study force of link jam and chain speed fluctuation, build fault incentive model; Through the experiment to validate the incentive model; Considering factors such as line morphological characteristics, material characteristics, chain tension, the multi-body dynamics theory was used to construct twist vibration thumbnail model under dynamic coordinates，then take twist vibration unit as the symbiotic unit,set uplongitudinal extension dynamic modelunderdynamic coordinates which include the chain rigidity constitutive model, sprocket-chain meshing equation,Central slot connection characteristics;Take symbiotic unit connection chain’s dynamic tension as variables, build the twist and longitudinal vibration dynamic model, through the numerical analysis and experimental verification and reveal the twist vibration and longitudinal vibration symbiosis mechanism.For scraper conveyor dynamic design’s firm - soft - loose coupling system dynamic characteristics analysis provide a theoretical basis.

综采面输送机链条扭摆、纵向振动叠加引起的链条张力分布不均、冲击载荷过大是导致链条断裂的主要原因。项目采用散体动力学理论研究刮板与物料刚散耦合动力学问题，确定二者同步与穿越运行状态判据，构建货载激励模型；研究输送机空间弯曲特征、刮板与中部槽接触碰撞问题，构建输送机线路形态激励模型；运用冲击动力学理论研究卡链力与链条速度波动的传播问题，构建故障激励模型；通过实验对上述激励模型进行验证；考虑线路形态特征、物料特征、链条张力等因素，采用多体动力学理论构建动坐标下扭摆振动缩略模型，再以扭摆振动单元为共生单元，建立包含链条刚度本构模型、链轮-链条啮合方程、中部槽连接特征的动坐标下纵向扩展动力学模型；以共生单元连接点链条的动张力为联系变量，构建扭摆与纵向振动联合动力学模型，通过数值分析和实验验证，揭示扭摆振动与纵向振动共生机制。为刮板输送机动态设计及刚-柔-散耦合系统动态特性分析提供理论基础。

综采面输送机链条扭摆、纵向振动叠加引起的链条张力分布不均、冲击载荷过大是导致链条断裂的主要原因。项目运用冲击动力学理论，构建了刮板输送机货载激励、卡链断链故障激励和线路形态激励对应的仿真计算数学模型，为后续研究多因素耦合作用下刮板输送机偏置载荷和扭摆振动特性提供了依据；建立了刮板链条体系扭摆振动力学模型，分析了刮板输送机上一个区域内的刮板链条在物料激励、卡链断链故障激励和线路形态激励作用下以及不同的沿线载荷工况下的扭摆振动响应特性；建立了扭摆振动应力波衰减评价指标，该指标可用于描述不同扭摆振动激励对刮板链条体系的影响区域；依据动力传动关系及驱动系统相对中部槽的位置；建立了刮板输送机动坐标下链条纵向振动扩展动力学模型；以共生单元连接点的链条的动张力为联系变量，建立了刮板链条体系扭摆-纵向振动联合动力学模型，并根据刮板输送机动力学方程，编写辅助数值模拟程序，针对输送机启动、停机、正常运行工况进行数值仿真分析。课题研究结果揭示了刮板输送机链条张力、速度、加速度、刮板群振动等参数的变化规律，揭示了刮板链条体系扭摆与纵向振动特性共生机制，揭示了刮板链传动系统扭摆与纵向振动对链条动态特性、两链条张力分配规律的影响。