基于键合图法的比例插装阀调压系统研究

发布时间：2018-10-22 18:40

【摘要】：本课题基于被压制件对液压机的多种工作压力需求,提出了一种比例插装阀调压系统,该调压系统可以实现变压力调整。针对比例插装阀调压系统设计调试中的关键技术问题,本课题主要工作分为以下五部分:1.为了满足大型液压机在工作过程中被压制件对液压机工作性能的需求,结合二通插装阀调压原理,设计出开环比例调压系统液压回路。根据所设计的液压回路图,建立其AMESim液压仿真模型。经仿真发现,系统存在压力超调、剧烈波动等现象。2.在开环比例调压系统基础上,加上压力传感器和PID控制器使其成为闭环系统。在开始时刻,系统的超调可以被抑制,且响应时间短。系统达到稳态后输出压力值不存在抖动现象,可以实现变压力调整。3.分析开环比例调压系统的功率流程,画出比例调压系统键合图。选择合适的状态变量,写出开环比例调压系统的状态方程并通过MATLAB仿真探究元件参数对调压结果的影响。4.基于TwinCAT2平台,采用Beckhoff控制器设计比例调压系统的电气控制系统,编写控制程序,设计控制面板,使比例调压系统正常工作。5.将设计的闭环比例调压系统应用于合肥合锻智能制造股份有限公司生产的大型液压机上进行实验,实验结果表明,液压机能够输出预期的多种压力值,保压时间长且保压期间内,压力不发生抖动现象,超调量仅为1.3%,达到了预期的调压效果。
[Abstract]:Based on the pressure requirement of pressed parts to hydraulic press, a pressure-regulating system of proportional cartridge valve is proposed in this paper, which can adjust variable pressure. In view of the key technical problems in the design and debugging of the proportional cartridge valve pressure regulation system, the main work of this paper is divided into five parts as follows: 1. In order to meet the demands of the pressed parts of the large hydraulic press on the working performance of the hydraulic press, combined with the principle of regulating the pressure of the two-way cartridge valve, the hydraulic circuit of the open-loop proportional pressure regulating system is designed. According to the designed hydraulic circuit diagram, the AMESim hydraulic simulation model is established. By simulation, it is found that pressure overshoot, violent fluctuation and other phenomena exist in the system. 2. On the basis of open loop proportional voltage regulation system, pressure sensor and PID controller are added to make it a closed loop system. At the beginning, the overshoot of the system can be suppressed and the response time is short. There is no jitter in the output pressure value after the system reaches the steady state, and the variable pressure adjustment can be realized. 3. 3. The power flow of the open loop proportional voltage regulating system is analyzed and the bond diagram of the proportional voltage regulating system is drawn. The state equation of the open-loop proportional voltage regulating system is written out by selecting appropriate state variables. The influence of component parameters on the voltage regulation results is explored by MATLAB simulation. 4. Based on TwinCAT2 platform, the electrical control system of proportional voltage regulation system is designed by using Beckhoff controller. The control program is written and the control panel is designed to make the proportional voltage regulating system work normally. 5. The designed closed loop proportional pressure regulating system is applied to the large hydraulic press produced by Hefei forging Intelligent Manufacturing Co., Ltd. The experimental results show that the hydraulic press can output a variety of expected pressure values. During the period of holding pressure, the pressure does not jitter, and the overshoot is only 1.3%, which achieves the desired pressure regulation effect.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG305

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