薄煤层采煤机自动调高系统特性及关键零件可靠性研究
发布时间：2018-08-01 11:57
【摘要】：采煤机调高系统性能的优劣对采煤机工作的可靠性和生产效率有着直接的影响,是采煤机的关键组成部分。以某型采煤机自动调高系统为研究对象,建立了调高控制系统数学模型并对其性能进行分析,研究发现采用模糊PID控制的调高系统具有更好的快速性、稳定性和抗干扰性,是一种更好的控制策略；针对含硫化铁结核的复杂煤层赋存条件,对采煤机自动调高系统的关键零件进行了可靠性分析,构建调高系统的刚柔耦合模型和机液耦合模型,通过仿真得到了此调高系统的调高液压缸及活塞杆在含硫化铁结核复杂工况下的薄弱部位,并基于此提出了优化方法,提高了系统的动态可靠性；最后利用Nsoft软件对优化后调高系统的关键零件进行疲劳寿命预测,得到了液压缸和活塞杆的最小疲劳循环次数,结果均可满足疲劳强度的要求。论文研究的结果为今后采煤机自动调高系统的设计与优化提供了借鉴,对工程实际具有一定的指导作用。
[Abstract]:The performance of shearer's high adjusting system has a direct effect on the reliability and production efficiency of shearer, and it is a key component of shearer. Taking the automatic height adjustment system of a shearer as the research object, the mathematical model of the height control system is established and its performance is analyzed. It is found that the height control system with fuzzy PID control has better rapidity, stability and anti-interference. Aiming at the occurrence condition of complex coal seam containing iron sulfide nodule, the reliability analysis of the key parts of automatic height adjusting system of shearer is carried out, and the rigid-flexible coupling model and the mechanical-liquid coupling model of the height adjusting system are constructed. Through simulation, the weak parts of the hydraulic cylinder and piston rod in the complex working condition with iron sulfide nodules are obtained, and the optimization method is put forward to improve the dynamic reliability of the system. Finally, the fatigue life of the key parts of the optimization system is predicted by using Nsoft software, and the minimum fatigue cycle times of the hydraulic cylinder and piston rod are obtained. The results can meet the requirements of fatigue strength. The results of this paper can be used for reference in the design and optimization of automatic height adjustment system of shearer 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】：TD632.1
本文编号：2157499
[Abstract]:The performance of shearer's high adjusting system has a direct effect on the reliability and production efficiency of shearer, and it is a key component of shearer. Taking the automatic height adjustment system of a shearer as the research object, the mathematical model of the height control system is established and its performance is analyzed. It is found that the height control system with fuzzy PID control has better rapidity, stability and anti-interference. Aiming at the occurrence condition of complex coal seam containing iron sulfide nodule, the reliability analysis of the key parts of automatic height adjusting system of shearer is carried out, and the rigid-flexible coupling model and the mechanical-liquid coupling model of the height adjusting system are constructed. Through simulation, the weak parts of the hydraulic cylinder and piston rod in the complex working condition with iron sulfide nodules are obtained, and the optimization method is put forward to improve the dynamic reliability of the system. Finally, the fatigue life of the key parts of the optimization system is predicted by using Nsoft software, and the minimum fatigue cycle times of the hydraulic cylinder and piston rod are obtained. The results can meet the requirements of fatigue strength. The results of this paper can be used for reference in the design and optimization of automatic height adjustment system of shearer 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】：TD632.1
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