Design Of Measurement And Control System Of Double Plunger Pump

In recent years,with the continuous development of economic society and scientific technology,oil become an indispensable important part of people's life,because of years of collecting,declining oil can now collection capacity,increasing the difficulty of the oil gathering,so the study of oil gathering of high pressure is particularly important.The real-time monitoring of liquid flow under high pressure and the study of liquid under high pressure are the key points in the oil production industry,which is of great significance to increase oil production and reduce oil production cost.In actual production,the research on the physical properties of liquid under high pressure will be helpful to the development of oil exploitation industry because of the difference between the physical properties of liquid under high pressure and normal pressure.In this paper,a set of measuring and controlling instrument of double plunger pump is designed to provide an experimental platform for liquid research under high pressure.According to the different requirements of liquid research,the system provides a working mode of constant pressure and constant current,which provides a controllable physical environment for liquid research.This paper describes the mechanical structure of the plunger pump,and describes the working principle of constant pressure mode and constant current mode of the double plunger pump system.Aiming at the demand of measurement and control system of double plunger pump,the design scheme of measurement and control system based on microcontroller,sensor,servo motor,servo driver and touch screen is put forward.The touch screen is used as the upper computer to realize the man-machine interaction.The main controller USES STM32F103R8T6 microcontroller of ST company to realize the analysis and processing of the collected data,the control of the actuator and the data interaction with the display screen.This paper introduces in detail the design of upper machine and lower machine of double plunger pump measurement and control system.The design of the lower machine of the two-plunger pump measurement and control system mainly includes the hardware design and the corresponding software design.In this paper,the hardware design scheme of the special controller based on STM32F103R8T6 MCU is introduced in detail,including the design of process channels such as analog input/output,switch input/output and so on.According to the design requirements of the measurement and control system,the special controller designs the AI channel based on the AD conversion chip ADS1119,which is used to detect the pressure information in the measurement and control system.The special controller makes full use of the internal resources of STM32F103R8T6 chip and outputs control signals for the servo motor controller through the microcontroller STM32F103R8T6 chip to realize the control of the servo motor.DI channel design is realized through the chip internal I/O module and isolation circuit,which is used to detect the limit of plunger in the system.Through the chip internal I/O module and solid state relay to achieve DO channel design,to achieve the solenoid valve switching volume control.The software of the next computer is developed by using C language in MDK integration environment.The paper introduces the whole structure of the software and gives the flow chart of each function module.The upper computer USES the touch screen as the human-machine interaction tool,and develops the upper computer software by using the VGUS4.3 tool software.This paper introduces the software development process and function realization of the upper computer in detail.