电液比例张力控制在铅阴极开卷机上应用研究

发布时间：2018-06-10 12:16

本文选题：开卷机 + 间接张力控制　；参考：《昆明理工大学》2014年硕士论文

【摘要】：铅片开卷机是铅阴极制备机组中的重要设备,开卷张力的控制直接影响到阴极板生产的质量和效率。本文根据实际工况,研究对象是新型铅片开卷机,将电液比例控制技术、间接张力控制技术运用其中,并对相关技术原理进行深入研究。首先,本文总结了国内外电液比例技术和张力控制技术,并概述电液比例控制系统的特点和应用。其中,重点论述了张力控制系统的应用情况及国内外电液比例张力控制的发展现状。其次,本文在分析和研究张力产生、控制原理和工作过程中,发现了影响铅片开卷机张力控制的主要因素,进行了浮动张力辊受力分析,提出了惯性力矩补偿、卷径计算与修正的方法,从而提高了张力控制精度。建立电液比例换向阀对液压马达的速度控制系统和电液比例溢流阀对液压马达的张力控制系统,通过对整个铅片开卷过程的分析,分别设计了基于恒线速度、恒张力的电液比例张力控制系统。再次,本文对开卷机主要采用分段建模的方式,利用各液压元件的数学模型,分别建立了电液比例速度、力矩、力控制系统。然后,利用Matlab软件分别对各工作段进行仿真研究。由于开卷机的速度和张力存在耦合性,所以通过联系两者之间关系,实现建立铅片开卷机生产线系统数学模型的目标。最后,鉴于铅片开卷机电液比例张力控制系统参数存在的时变、耦合和多干扰等特点,本文采用基于指数趋近率的滑模变结构控制策略(SMC)。并通过Matlab/Simulink仿真工具搭建电液比例速度、力矩和力控制模型,进行了仿真分析。在铅片开卷机电液比例张力控制中,将PID用于张力控制,系统存在超调且不稳定,响应速度慢,控制性能较差。相反,采用SMC控制,系统能具有较强适应参数时变干扰的能力和鲁棒性,并且控制性能明显优于PID控制。此外,本文为了检测开卷机液压系统的电液换向阀性能是否满足实际工况,利用本实验室的电液伺服台对其性能指标进行测试,如：空载流量特性、压力特性、压力—流量特性,幅频和相频等静、动态特性。通过对各曲线的分析,确认出所选的电液换向阀满足实际开卷机液压系统要求,从而为电液比例张力控制系统的建立奠定了基础。
[Abstract]:Lead sheet uncoiling machine is an important equipment in lead cathode preparation unit. The control of uncoiling tension directly affects the quality and efficiency of cathode plate production. According to the actual working conditions, the research object is a new type of lead sheet uncoiling machine. The electro-hydraulic proportional control technology and indirect tension control technology are applied in the research. This paper summarizes the electro-hydraulic proportional technology and tension control technology at home and abroad, and summarizes the characteristics and application of electro-hydraulic proportional control system. Among them, the application of tension control system and the development status of electro-hydraulic proportional tension control at home and abroad are discussed. Secondly, this paper analyzes and studies the generation, control principle and working process of tension. The main factors affecting tension control of lead sheet uncoiler are found. The force analysis of floating tension roller is carried out, and the methods of inertia torque compensation, calculation and correction of winding diameter are put forward, so as to improve the precision of tension control. The speed control system of electro-hydraulic proportional directional valve to hydraulic motor and the tension control system of electro-hydraulic proportional relief valve to hydraulic motor are established. Through the analysis of the whole uncoiling process of lead sheet, the constant linear velocity is designed respectively. Thirdly, the paper mainly adopts the method of subsection modeling to unwind the coiler, and establishes the electro-hydraulic proportional velocity, torque and force control system by using the mathematical model of each hydraulic element. Then, each working section is simulated by Matlab software. Because of the coupling between the speed and tension of the uncoiler, the goal of establishing the mathematical model of the production line of lead sheet uncoiler is realized by connecting the relationship between the two. Finally, In view of the time-varying, coupling and multi-interference characteristics of the electro-hydraulic proportional tension control system for lead sheet unwinding, a sliding mode variable structure control strategy based on exponential convergence rate is adopted in this paper. The electro-hydraulic proportional velocity, torque and force control model are built by Matlab / Simulink simulation tool, and the simulation analysis is carried out. In the proportional tension control of lead sheet uncoiling electromechanical fluid, pid is used in tension control. The system has overshoot and instability, slow response speed and poor control performance. On the contrary, with SMC control, the system has the ability and robustness to adapt to the time-varying disturbance of parameters, and the control performance is obviously better than that of pid control. In order to test whether the performance of electro-hydraulic reversing valve in hydraulic system of uncoiler meets the actual working condition, this paper uses the electro-hydraulic servo platform in our laboratory to test its performance index, such as no-load flow characteristic, pressure-flow characteristic, etc. Amplitude frequency and phase frequency are static and dynamic characteristics. Through the analysis of the curves, it is confirmed that the selected electro-hydraulic directional valve meets the requirements of the actual hydraulic system of the unwinding machine, thus laying a foundation for the establishment of the electro-hydraulic proportional tension control system.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TH137

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