刮板输送机在冲击载荷作用下的动态特性研究

发布时间：2018-11-20 06:17

【摘要】：刮板输送机是煤矿开采行业中的核心部分之一,在煤矿开采工作过程中刮板输送机在机身的不同位置,不定时的,要承受着静载荷,循环载荷,冲击载荷等诸多性质完全不同的载荷,可能会造成刮板链出现卡,断链等事故,从而导致整个开采工作无法正常进行下去。本文首先在考虑到溜槽之间的弹性及间隙的基础之上,建立了刮板输送机整机动力学模型。基于数学分析仿真软件Matlab,结合选用的实例,分析了刮板输送机在承受稳定载荷作用下启动时的动态响应特性；同时对刮板输送机在有载侧发生卡链的动态响应特性进行了研究。得出当有载侧卡链时,卡链位置与机头间的链条速度在很短的时间内降至0,卡链处到机尾间链条速度下降的较为缓慢；而卡链处到机头间链条张力急剧上升；远大于稳定运行时的张力,所以在此段容易发生链条断裂；卡链处到机尾间的链条张力几乎变为0,链条产生堆积的趋势。与此同时,在考虑实际运行过程中刮板受力是非均匀的,会使刮板产生扭摆动,在此基础上建立了刮板链条体系的动力学模型,采用阶跃与脉冲这两种冲击载荷模拟卡链工况,分别将这两种冲击载荷施加到刮板端头处,利用Matlab软件,对刮板输送机刮板链条体系在卡链工况下的动力学特性进行数学模拟仿真。得出刮板链条体系在承受了冲击载荷发生卡链时,使得被卡住的刮板产生扭摆振动,进而会导致其他刮板也产生不同程度的扭摆振动,越靠近被卡住的刮板其扭摆振动的越剧烈,越远离被卡住的刮板其扭摆振动越不明显。本文所研究的成果将会为未来我国刮板输送机的结构优化设计、故障诊断技术的发展提供一些相关的数据以及理论参考。
[Abstract]:Scraper conveyer is one of the core parts in coal mining industry. In the process of coal mining, scraper conveyors in different positions of fuselage, unscheduled, have to bear static load and cyclic load. Many kinds of loads with completely different properties, such as impact loads, may lead to accidents such as card and chain breakage of scraper chain, which will result in the whole mining work being unable to carry on normally. In this paper, the dynamic model of scraper conveyor is established on the basis of considering the elasticity and clearance between the chute. Based on the example of Matlab, the dynamic response of scraper conveyor under steady load is analyzed. At the same time, the dynamic response of scraper conveyor chain on load side is studied. The results show that the chain speed between the chain position and the head decreases to 0 in a very short time, and the chain speed from the chain to the tail decreases slowly, while the chain tension between the chain and the head increases sharply. It is much larger than the tension when the chain is running steadily, so it is easy to break the chain in this section; the chain tension between the chain and the tail is almost zero, and the chain has a tendency to accumulate. At the same time, considering the non-uniform force of the scraper in the actual operation process, the scraper will produce torsional wobble. On this basis, the dynamic model of the scraper chain system is established, and two kinds of impact loads, step and pulse, are used to simulate the chain mode. The two kinds of impact loads were applied to the end of the scraper, and the dynamic characteristics of the scraper chain system of the scraper conveyor were simulated by using Matlab software. It is concluded that when the chain system of scraper is subjected to impact load, the clamped scraper will produce torsional vibration, which will cause other scrapers to produce different degrees of torsional vibration. The closer it is to the stuck scraper, the more intense the torsion vibration is, and the less obvious the torsion vibration is when it is far away from the stuck scraper. The research results in this paper will provide some relevant data and theoretical reference for the structure optimization design and the development of fault diagnosis technology of scraper conveyor in China in the future.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD528.3

【参考文献】