DP80-3型三缸单作用液压隔膜泵动力端控制系统研究

发布时间：2018-06-10 19:14

本文选题：DP80-3型三缸单作用隔膜泵 + 电液比例方向阀　；参考：《兰州理工大学》2011年硕士论文

【摘要】：从上世纪70年代以来,随着料浆输送设备的迅速发展,隔膜泵在矿山、电站、冶金、石油及化工等各个行业得到了越来越普遍的应用。但目前传统隔膜泵的驱动形式大多为传统的机械式曲柄滑块机构,使得泵的流量脉动、震动和噪声较大,体积大以及制造成本高。因此,一种性价比高的新型动力端来代替传统的机械式动力端已成为未来隔膜泵发展的趋势。本课题在研究当前传统隔膜泵的基础上,针对DP80-3型隔膜泵动力端开展分析和设计,探讨解决传统隔膜泵存在的问题,设计了一种新型的三缸单作用液压动力端,可为液压隔膜泵的研究提供理论参考。本课题在分析当前常用的液压缸速度控制回路的基础上,设计了负载传感液压动力端,主要由三个单杆液压缸和一个主变量泵组成。具有节流损失小,结构简单,一次性制造成本低,安装维修方便,占地面积小,市场竞争力强等特点。同时,还选择了所需液压元件的规格和尺寸,建立了电液比例方向阀控液压缸和电液伺服换向阀控变量泵的线性数学模型,并在课题最后对系统液压缸的速度控制和变量泵的泵压控制的控制策略进行了理论研究和MATLAB/Simulink仿真,仿真结果和预期的结果有较好的一致性。本课题还深入研究了隔膜泵工作过程中液压缸的运行速度曲线,研究表明三个液压缸只有保持120度的相位角并按规定的速度曲线工作才能有效减轻隔膜泵的流量脉动、震动和噪声。同时,对液压隔膜泵动力端控制系统的硬件和软件实现进行了研究,选择了在控制过程中所需的PLC和相应的硬件模块,并对液压缸运行速度曲线在PLC控制器内的存储方式进行了一定的探讨。最终确定速度曲线按定时20ms变地址存储的原则,存储到PLC的用户存储器中。液压缸运行速度、位置的测量采用旋转增量式光电编码器,具有精度高、分辨力高、可靠性好、不需要A/D转换等特点,并可实现单个传感器测量多种变量的功能。
[Abstract]:Since the 70s of last century, with the rapid development of slurry conveying equipment, diaphragm pumps have been used more and more widely in various industries, such as mine, power plant, metallurgy, petroleum and chemical industry. However, most of the traditional diaphragm pumps are driven by traditional mechanical crank slider, which make the pump flow pulsating, vibration and noise larger. As a result, a new type of high power cost terminal instead of the traditional mechanical power end has become the trend of the development of diaphragm pumps in the future.
On the basis of the study of the current traditional diaphragm pump, this paper aims at the analysis and design of the power end of the DP80-3 diaphragm pump, and discusses the problems existing in the traditional diaphragm pump. A new type of three cylinder single action hydraulic power end is designed, which can provide theoretical reference for the research of the hydraulic diaphragm pump.
Based on the analysis of the current hydraulic cylinder speed control loop, this paper designs the load sensing hydraulic power end, mainly composed of three single rod hydraulic cylinders and a main variable pump, which has the characteristics of small loss of throttling, simple structure, low cost of one-time manufacture, small area of installation and maintenance, and strong market competitiveness. The specifications and sizes of the required hydraulic components are also selected, and the linear mathematical model of the electro-hydraulic proportional directional valve controlled hydraulic cylinder and the electro-hydraulic servo valve control variable pump is set up. At the end of the subject, the control strategy of the speed control of the hydraulic cylinder and the control of the pump pressure of the variable pump is studied, and the simulation of the simulation is made by the MATLAB/Simulink simulation. There is a good consistency between the results and the expected results. This subject has also studied the running speed curve of the hydraulic cylinder in the working process of the diaphragm pump. The research shows that the three hydraulic cylinders can only keep the phase angle of 120 degrees and work according to the prescribed speed curve to effectively reduce the flow pulsation, vibration and noise of the diaphragm pump. The hardware and software realization of the power end control system are studied, the PLC and the corresponding hardware modules needed in the control process are selected, and the storage mode of the running speed curve of the hydraulic cylinder in the PLC controller is discussed. Finally, the principle of the speed curve according to the timing 20ms to the address storage is determined, and the user is stored to the PLC user. In memory, the speed of the hydraulic cylinder and the position are measured by the rotary incremental photoelectric encoder, which has the characteristics of high precision, high resolution, good reliability, no A/D conversion and so on, and can realize the function of measuring a variety of variables by a single sensor.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH137.51

【引证文献】