【摘要】：采煤機(jī)調(diào)高系統(tǒng)性能的優(yōu)劣對(duì)采煤機(jī)工作的可靠性和生產(chǎn)效率有著直接的影響,是采煤機(jī)的關(guān)鍵組成部分。以某型采煤機(jī)自動(dòng)調(diào)高系統(tǒng)為研究對(duì)象,建立了調(diào)高控制系統(tǒng)數(shù)學(xué)模型并對(duì)其性能進(jìn)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(duì)含硫化鐵結(jié)核的復(fù)雜煤層賦存條件,對(duì)采煤機(jī)自動(dòng)調(diào)高系統(tǒng)的關(guān)鍵零件進(jìn)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(jī)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(fù)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(dòng)態(tài)可靠性；最后利用Nsoft軟件對(duì)優(yōu)化后調(diào)高系統(tǒng)的關(guān)鍵零件進(jìn)行疲勞壽命預(yù)測(cè),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(qiáng)度的要求。論文研究的結(jié)果為今后采煤機(jī)自動(dòng)調(diào)高系統(tǒng)的設(shè)計(jì)與優(yōu)化提供了借鑒,對(duì)工程實(shí)際具有一定的指導(dǎo)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(xué)位授予單位】：遼寧工程技術(shù)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TD632.1

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