薄煤層采煤機自動調(diào)高系統(tǒng)特性及關鍵零件可靠性研究
發(fā)布時間:2018-08-01 11:57
【摘要】:采煤機調(diào)高系統(tǒng)性能的優(yōu)劣對采煤機工作的可靠性和生產(chǎn)效率有著直接的影響,是采煤機的關鍵組成部分。以某型采煤機自動調(diào)高系統(tǒng)為研究對象,建立了調(diào)高控制系統(tǒng)數(shù)學模型并對其性能進行分析,研究發(fā)現(xiàn)采用模糊PID控制的調(diào)高系統(tǒng)具有更好的快速性、穩(wěn)定性和抗干擾性,是一種更好的控制策略;針對含硫化鐵結(jié)核的復雜煤層賦存條件,對采煤機自動調(diào)高系統(tǒng)的關鍵零件進行了可靠性分析,構(gòu)建調(diào)高系統(tǒng)的剛?cè)狁詈夏P秃蜋C液耦合模型,通過仿真得到了此調(diào)高系統(tǒng)的調(diào)高液壓缸及活塞桿在含硫化鐵結(jié)核復雜工況下的薄弱部位,并基于此提出了優(yōu)化方法,提高了系統(tǒng)的動態(tài)可靠性;最后利用Nsoft軟件對優(yōu)化后調(diào)高系統(tǒng)的關鍵零件進行疲勞壽命預測,得到了液壓缸和活塞桿的最小疲勞循環(huán)次數(shù),結(jié)果均可滿足疲勞強度的要求。論文研究的結(jié)果為今后采煤機自動調(diào)高系統(tǒng)的設計與優(yōu)化提供了借鑒,對工程實際具有一定的指導作用。
[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.
【學位授予單位】:遼寧工程技術大學
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:TD632.1
本文編號:2157500
[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.
【學位授予單位】:遼寧工程技術大學
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:TD632.1
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