采煤机机电液短程截割传动系统设计与性能分析

发布时间：2018-06-06 06:52

本文选题：采煤机 + 截割传动系统　；参考：《重庆大学》2015年硕士论文

【摘要】：制约我国经济发展的突出瓶颈是能源,鉴于我国“富煤、贫油、少气”的能源赋存特征,地下煤炭开采仍然是支撑我国经济社会持续发展能源需求的必然选择,这就对采煤机的可靠性和自适应性提出了更高的要求。采煤机截割部目前采用齿轮传动系统,采掘作业的重载、强冲击载荷均通过齿轮进行传递,重载下的摇臂箱体变形会导致齿轮啮合情况变恶劣,若有一个齿轮发生破坏将导致整机停止工作,因而可靠性较低。另外,所开采煤的块煤率是由滚筒转速、牵引速度和结构参数综合决定。由于目前滚筒不能调速,因而难以对块煤率进行有效地控制。本文以MG300/700型电牵引采煤机为应用对象,以提高采煤机自适应性和可靠性为目标,在充分了解传统采煤机基础上,进行了采煤机机电液短程截割传动系统的方案设计和参数匹配,并进行了相关理论分析和评价,主要做了如下工作:①在详细了解传统采煤机的组成和工作原理的基础上,设计了采煤机机电液短程截割传动系统。该系统采用多变量泵多液压马达结构,实现了短程传动和滚筒调速,提高了采煤机可靠性和自适应性。系统还采用蓄能器实现负载突变下的缓冲减振,特有的失效保护功能可以进一步提高采煤机可靠性。②针对所设计的机电液短程截割传动系统进行了参数匹配和关键部件选型。其次,建立了各关键部件的数学模型和仿真模型,并对各关键部件的特性进行了分析,结果表明所建部件模型能客观真实反映部件的功能特点。③建立了机电液短程截割传动系统的仿真模型,分别从调速性能、抗冲击性能和效率三个方面进行了仿真分析。仿真结果表明系统能实现滚筒的良好调速,并且系统中添加蓄能器后能很好地缓冲减振。另外,系统总效率能达到70%以上。④搭建了采煤机截割滚筒负载模型和牵引系统模型,在此基础上建立了采煤机整机模型并制定了相应综合控制策略。基于整机模型和控制策略,进行了各典型工况下的综合分析,结果表明所设计截割传动系统具有良好的自适应能力和可靠性。本文进行了采煤机机电液短程截割传动系统的设计与理论分析,提出了采煤机综合控制策略,为采煤机截割传动系统提供理论依据,为进一步实现工程应用奠定基础。
[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.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD421.6

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