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刮板输送机动力学建模及链环疲劳可靠性研究
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摘要
刮板输送机是煤矿生产的重要设备,主要完成井下煤炭的运输任务。由于刮板机运行工况恶劣,刮板机链条故障发生频繁,严重地影响了煤炭的安全高效生产。
     为解决这一工程问题,论文首先建立了某型刮板输送机链传动系统的刚体动力学模型,并进行了仿真分析,研究其运动学、动力学特性;然后建立立环为柔性体的链传动系统刚-柔耦合动力学模型,按三种功率输出状态分别进行了立环动态载荷虚拟测试,得到了链环在各仿真时刻的应力状态和载荷应力时间历程,根据刮板输送机任务特征编制载荷谱,并选择线性疲劳损伤累积法则进行了立环危险点的疲劳寿命计算,研究其疲劳可靠性;最后开发了刮板输送机链条工况综合监测装置,该装置由刮板输送机故障检测单元和二次仪表组成,能够检测刮板输送机的断链或堵转、断刮板、跳链等故障,并将检测结果上传地面调度室。
     利用虚拟样机技术进行链环疲劳可靠性分析,并开发综合监测装置监测刮板输送机链传动系统的运行状态,可有效提高煤炭生产的安全性。
The scraper conveyor is important equipment for coal production, complete mainly coal transport task. But because the bad running condition, the chain's trouble occur frequently,it affects it affects coal safety and high efficient production.
     In order to solve the engineering problems, firstly, a dynamic model has been founded and simulated in this article, which can be used for researching of the dynamic characteristic of AFC sprocket transmission system. Secondly,the rigid-flexible coupling model of sprocket transmission system is established, in the which the vertical chains is flexible body.Dynamic simulation is carried out on the condition of electromotor rated power output, constant power output, maximum power output. Dynamic stress/strain histories of chains are attained. On the bases of load histories, Palmgren-Miner rules are used to estimate the fatigue life of vertical chain. Finally, the device for monitoring chain's status of conveyor is developed.With the device, the trouble, such as chain-breanking.locked-rotor, scraper-breaking,chain-jumping,can be detected and the result can be send to the control room on the ground.
     Base on the virtual prototyping technology, the fatigue life of chain is estimated, trouble dectecting device is designed. This work can effectively improve the safety of coal production.
引文
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