采煤机调高液压系统应用负载敏感技术研究

发布时间：2018-03-14 17:41

本文选题：采煤机　切入点：调高液压系统　出处：《太原科技大学》2017年硕士论文　论文类型：学位论文

【摘要】：近几年来,国家对煤炭行业的发展越来越重视,而采煤机作为井工开采的核心设备,其优点为生产率高、重大恶性事故小和改善劳动条件等。调高液压系统作为采煤机的重要组成部分,其性能对煤矿开采的效率和原煤质量起着重要作用,因此,对采煤机调高液压系统的研究有着重要意义。目前,采煤机调高液压系统普遍采用定量泵调高液压系统,由于定量泵调高液压系统往往存在较大的溢流和节流损失,系统效率低下,而负载敏感技术消除了系统的溢流损失,只有节流损失,且节流损失的功率相对较小,因此负载敏感技术具有节能高效的优点。基于节能高效的优点,提出了一种采煤机负载敏感变量泵调高液压系统,在此基础上,完成了采煤机效率和基于突变载荷的动态特性分析研究。主要工作如下:1、分析了采煤机定量泵调高液压系统能耗损失大效率低的原因,针对定量泵系统效率低的缺点,本文提出了一种采煤机负载敏感变量泵调高液压系统。2、在对负载敏感变量泵调高液压系统工作原理详细分析的基础上,利用仿真软件Matlab/Simhydraulics对定量泵调高液压系统和负载敏感变量泵调高液压系统分别进行建模,并对其进行了稳定性分析。3、针对效率问题对采煤机负载敏感变量泵调高液压系统和定量泵调高液压系统进行了比较分析及仿真实验研究,结果表明负载敏感变量泵调高液压系统效率远高于定量泵液压系统。4、在Matlab/Simmechanics中建立采煤机机构简化模型,并在Matlab/Simulink环境下建立采煤机机构简化模型和负载敏感变量泵调高液压系统的联合仿真模型。5、在采煤机联合仿真模型基础上,提出了一种突变工况下调高液压系统位置(调高油缸活塞杆位移)和牵引速度PID控制策略。对采煤机PID联合仿真模型进行动态分析得到采煤机各环节的动态变化曲线,验证了联合仿真模型正确性。综上所述,本文提出的采煤机负载敏感变量泵调高液压系统有效的提高了系统的效率,解决了定量泵调高液压系统效率低的缺点;在突变工况下,得到的联合仿真模型中各环节的动态变化曲线为进一步研究采煤机特性奠定了一定基础。
[Abstract]:In recent years, the state has paid more and more attention to the development of the coal industry. As the core equipment of well mining, the advantages of shearer are high productivity. As an important part of shearer, its performance plays an important role in coal mining efficiency and raw coal quality. It is of great significance to study the hydraulic system of the height adjustment of the shearer. At present, the hydraulic system of the height adjustment of the shearer generally adopts the hydraulic system of the quantitative pump to adjust the height, because of the large overflow and throttling loss of the hydraulic system of the adjustment of the height of the quantitative pump. The system efficiency is low, but the load sensitive technology eliminates the overflow loss of the system, only the throttling loss, and the power of the throttling loss is relatively small, so the load sensitive technology has the advantage of energy saving and high efficiency. In this paper, a kind of hydraulic system of load sensitive variable pump for shearer is put forward. The research on shearer efficiency and dynamic characteristics based on sudden load is completed. The main work is as follows: 1. The main work is as follows: 1. The main work is as follows: 1. The main work is as follows: 1. The main work is to analyze the reasons for the high energy loss and low efficiency of the hydraulic system of the quantitative pump of the shearer. In this paper, a kind of hydraulic system of load sensitive variable pump for shearer is put forward, which is based on the detailed analysis of the working principle of load sensitive variable pump height adjusting hydraulic system. The simulation software Matlab/Simhydraulics is used to model the hydraulic system of the quantitative pump and the load sensitive variable pump respectively. The stability analysis. 3. Aiming at the problem of efficiency, the paper compares the hydraulic system of load sensitive variable pump and the hydraulic system of quantitative pump, and studies the simulation experiment on the hydraulic system of shearer load sensitive variable pump. The results show that the efficiency of load sensitive variable pump is much higher than that of quantitative pump system. The simplified model of shearer mechanism is established in Matlab/Simmechanics. Under the environment of Matlab/Simulink, the simplified model of shearer mechanism and the joint simulation model of hydraulic system with load sensitive variable pump are established. The model is based on the model of shearer joint simulation. A new PID control strategy for lowering the position of high hydraulic system (adjusting the displacement of cylinder piston rod) and the traction speed is proposed in this paper. The dynamic change curve of each link of shearer is obtained by dynamic analysis of the combined PID simulation model of shearer. In conclusion, the hydraulic system proposed in this paper can effectively improve the efficiency of the system and solve the problem of low efficiency of the quantitative pump. The dynamic curves of each link in the joint simulation model lay a foundation for further study on the characteristics of shearer.
【学位授予单位】：太原科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD421.6

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