本文選題：采煤機 + 截割傳動系統(tǒng)��； 參考：《重慶大學》2015年碩士論文

【摘要】：制約我國經(jīng)濟發(fā)展的突出瓶頸是能源,鑒于我國“富煤、貧油、少氣”的能源賦存特征,地下煤炭開采仍然是支撐我國經(jīng)濟社會持續(xù)發(fā)展能源需求的必然選擇,這就對采煤機的可靠性和自適應性提出了更高的要求。采煤機截割部目前采用齒輪傳動系統(tǒng),采掘作業(yè)的重載、強沖擊載荷均通過齒輪進行傳遞,重載下的搖臂箱體變形會導致齒輪嚙合情況變惡劣,若有一個齒輪發(fā)生破壞將導致整機停止工作,因而可靠性較低。另外,所開采煤的塊煤率是由滾筒轉(zhuǎn)速、牽引速度和結構參數(shù)綜合決定。由于目前滾筒不能調(diào)速,因而難以對塊煤率進行有效地控制。本文以MG300/700型電牽引采煤機為應用對象,以提高采煤機自適應性和可靠性為目標,在充分了解傳統(tǒng)采煤機基礎上,進行了采煤機機電液短程截割傳動系統(tǒng)的方案設計和參數(shù)匹配,并進行了相關理論分析和評價,主要做了如下工作:①在詳細了解傳統(tǒng)采煤機的組成和工作原理的基礎上,設計了采煤機機電液短程截割傳動系統(tǒng)。該系統(tǒng)采用多變量泵多液壓馬達結構,實現(xiàn)了短程傳動和滾筒調(diào)速,提高了采煤機可靠性和自適應性。系統(tǒng)還采用蓄能器實現(xiàn)負載突變下的緩沖減振,特有的失效保護功能可以進一步提高采煤機可靠性。②針對所設計的機電液短程截割傳動系統(tǒng)進行了參數(shù)匹配和關鍵部件選型。其次,建立了各關鍵部件的數(shù)學模型和仿真模型,并對各關鍵部件的特性進行了分析,結果表明所建部件模型能客觀真實反映部件的功能特點。③建立了機電液短程截割傳動系統(tǒng)的仿真模型,分別從調(diào)速性能、抗沖擊性能和效率三個方面進行了仿真分析。仿真結果表明系統(tǒng)能實現(xiàn)滾筒的良好調(diào)速,并且系統(tǒng)中添加蓄能器后能很好地緩沖減振。另外,系統(tǒng)總效率能達到70%以上。④搭建了采煤機截割滾筒負載模型和牽引系統(tǒng)模型,在此基礎上建立了采煤機整機模型并制定了相應綜合控制策略。基于整機模型和控制策略,進行了各典型工況下的綜合分析,結果表明所設計截割傳動系統(tǒng)具有良好的自適應能力和可靠性。本文進行了采煤機機電液短程截割傳動系統(tǒng)的設計與理論分析,提出了采煤機綜合控制策略,為采煤機截割傳動系統(tǒng)提供理論依據(jù),為進一步實現(xiàn)工程應用奠定基礎。
[Abstract]:The prominent bottleneck that restricts the economic development of our country is energy. In view of the energy occurrence characteristics of "rich in coal, lean oil and less gas", underground coal mining is still the inevitable choice to support the sustainable development of our country's economic and social energy demand. This puts forward higher requirements for the reliability and self-adaptability of shearer. At present, the cutting part of the shearer adopts gear transmission system. The heavy load and the strong impact load of the mining operation are all transmitted through the gear. The deformation of the rocker box under the heavy load will result in the bad meshing condition of the gear. If a gear failure will cause the whole machine to stop working, so the reliability is low. In addition, the block coal rate is determined by drum speed, traction speed and structure parameters. Because the drum can not adjust speed, it is difficult to control the block coal rate effectively. Taking MG300/700 type electric traction shearer as the application object, aiming at improving the self-adaptability and reliability of the shearer, on the basis of fully understanding the traditional shearer, the scheme design and parameter matching of electromechanical and hydraulic short-range cutting drive system of shearer are carried out. Based on the detailed understanding of the composition and working principle of the traditional shearer, the electromechanical and hydraulic short-range cutting drive system of the shearer is designed. The system adopts multi-variable pump and multi-hydraulic motor structure to realize short-range transmission and drum speed regulation, and improves the reliability and self-adaptability of shearer. The system also uses accumulator to realize the buffer and vibration absorption under the sudden change of load. The special function of failure protection can further improve the reliability of the shearer. 2. The parameter matching and the selection of key components are carried out for the designed electromechanical and hydraulic short-range cutting drive system. Secondly, the mathematical model and simulation model of each key component are established, and the characteristics of each key component are analyzed. The results show that the component model can objectively and truly reflect the functional characteristics of the components. 3. The simulation model of electromechanical and hydraulic short range cutting transmission system is established. The simulation analysis is carried out from three aspects: speed regulation performance, impact resistance performance and efficiency. The simulation results show that the system can achieve good speed regulation of the drum, and the accumulator can be added to the system to buffer and reduce vibration. In addition, the total efficiency of the system can reach more than 70%. 4. The shearer cutting drum load model and the traction system model are built. On this basis, the shearer model is established and the corresponding comprehensive control strategy is worked out. Based on the model of the whole machine and the control strategy, a comprehensive analysis is carried out under various typical working conditions. The results show that the designed cutting drive system has good adaptability and reliability. In this paper, the design and theoretical analysis of electromechanical and hydraulic short-range cutting drive system of shearer are carried out, and the comprehensive control strategy of shearer is put forward, which provides the theoretical basis for cutting transmission system of shearer and lays a foundation for further engineering application.
【學位授予單位】：重慶大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TD421.6

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