带式输送机液粘软启动技术研究

发布时间：2018-01-05 02:03

本文关键词：带式输送机液粘软启动技术研究　出处：《吉林大学》2011年硕士论文　论文类型：学位论文

【摘要】：目前,应用于井下煤炭运输、地面电厂、选煤厂的带式输送机,大约有100万条。对于大型带式输送机在安装使用过程中不仅需要考虑功率匹配得当,布局合理外,还要解决大型带式输送机在启动过程中对电网和皮带等的冲击,也就是常见的带式输送机软启动问题,带式输送机软启动直接关系到了输送机的工作性能以及煤矿安全生产。设计一套合理的软启动装置对煤矿安全生产以及改善带式输送机工作性能具有重大意义。常用的带式输送机启动方式主要有三种,分别是电控制型调速软启动、液力耦合器调速启动以及液粘传动调速启动。通过对比可知液体粘性传动调速启动在高速段性能优于液力耦合器,在低速段性能优于电控制型调速。另外,其在制造成本、散热、维护的方便性等方面相对其他调速方式具有无可比拟的优越性。但是我国在这方面的研究处于起步阶段,关键技术仍然掌握在美国和澳大利亚等技术先进的国家,并对其进行了严格封锁。本文通过对大量的文献资料阅读以及在煤矿井下实际调研的基础上,对现有的液粘软启动装置进行了相关理论分析。剖析了液粘软启动装置的基本结构,分析了液粘摩擦机理,建立了液粘传动动力学模型和油膜承载力模型。在对液粘传动机理的理论分析基础上,建立了摩擦片组的动力学平衡方程,同时计算分析了系统流量平衡方程和负载动态平衡方程,建立了比例压力控制的传递函数。采用电液比例控制油膜厚度,进而控制输出扭矩。对电液比例控制系统的开环响应特性和稳定性进行了计算机仿真与分析,找出其存在的缺陷,为控制策略的制定奠定了一定的基础。针对液粘调速软启动开环控制的不足,设计了PID控制的闭环控制策略。对PID参数进行了整定,并进行了仿真。结果表明传统PID控制无法获得较好的带式输送机调速启动效果。继而本文又采用了PID优化控制对PID参数进行整定,利用优化后参数对Harrision启动速度曲线进行了仿真,实现了带式输送机理想调速启动效果。最后本文利用液粘传动实验台研究摩擦副间油膜压力场及扭矩传递特性,对理论分析的正确性进行了验证。对带式输送机调速启动整定的PID优化控制进行了分析验证,同时还分析了工作油温度、负载大小及启动时间对调速启动的影响,得到了各因素的影响规律。
[Abstract]:At present , the belt conveyor , which is applied to underground coal transportation , ground power plant and coal preparation plant , has about 1 million pieces . In the process of installation and use of large - scale belt conveyor , it is necessary not only to consider the power match properly , but also to solve the impact of large - scale belt conveyor on power grid and belt in the start - up process , which is the soft start - up problem of the belt conveyor . The soft start of belt conveyor is directly related to the work performance of conveyor and the safety production of coal mine . A reasonable soft start - up device is designed to make great significance to the safety production of coal mine and to improve the working performance of belt conveyor . There are three main types of starting mode of belt conveyor , which are electric control type speed control soft start , hydraulic coupler speed regulation start and hydraulic viscous transmission speed regulation start . The paper analyses the basic structure of hydraulic viscous soft start - up device , analyzes the basic structure of hydraulic viscous soft start - up device , establishes the dynamic equilibrium equation of the friction plate group and establishes the transfer function of proportional pressure control based on the theoretical analysis of the mechanism of hydraulic viscous transmission . In this paper , a closed - loop control strategy for PID control is designed . The PID parameters are set up and the simulation results show that the traditional PID control is not able to obtain better speed control effect of belt conveyor . In the end , the pressure field and torque transmission characteristics of the oil film in the friction pairs are studied by using the liquid - stick transmission experimental bench , and the correctness of the theoretical analysis is verified . The PID optimization control of the speed regulation starting setting of the belt conveyor is analyzed and verified , and the influence of the working oil temperature , the load size and the starting time on the starting of the speed regulation is also analyzed , and the influence rule of each factor is obtained .

【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH222

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