Design And Control Strategy Research Of Digital Radial Plunger Pump

In recent years,both domestically and internationally,higher strategic requirements have been put forward for the manufacturing industry."Made in China 2025" aims at the digitalization and intellectualization of "Made in China",moving towards the innovation driven development path;Industry 4.0 requires improving the level of intelligence in the manufacturing industry.In the context of digitalization in the manufacturing industry,there is also a demand for digital intelligence in the hydraulic industry.Researchers in the hydraulic field have developed digital pumps and digital motors.The digital pump and digital motor are controlled by high-speed electromagnetic on-off valves,which can achieve high efficiency within a large range of displacement.This electrohydraulic integrated device achieves intelligence and efficiency,which not only greatly improves the overall work efficiency of the hydraulic transmission system,but also has a positive impact on the environment.This thesis designs a digital radial piston pump based on the traditional radial piston pump,which uses a high-speed electromagnetic on-off valve to replace the digital flow distribution method of traditional mechanical flow distribution.Based on the designed digital radial piston pump,a dynamic analysis is conducted on the traditional radial piston pump,explaining the working principle and complete flow distribution process of the digital radial piston pump.The response time of the high-speed electromagnetic switching valve core,PWM duty cycle signal,and duty cycle phase in the digital piston are simulated and analyzed using Amesim simulation software.Perform staged adjustment simulation on digital radial piston pump under different displacement,and perform stepless adjustment simulation on digital piston,and perform mixed adjustment simulation under different displacement conditions;Based on the simulation results,this thesis optimizes the substrate combination method to achieve the upward shift of the flow pulsation curve and the downward shift of the peak at the outlet of the digital radial piston pump.By studying control strategies,improve the efficiency and reliability of digital radial piston pumps;Finally,design the control system software and select the hardware for the digital radial piston pump.Develop a digital radial piston pump displacement control system using Siemens TIA Portal as the development platform.According to the working principle and functional requirements of the digital radial piston pump,corresponding control processes were designed and programmed one by one,mainly including system initialization,expected flow input setting,system start stop,and the working status of the high-speed electromagnetic on-off valve group.Finally,a touch screen human-machine interface was designed for the operation process of the digital radial piston pump.