Research On Power Unit Energy Saving Based On Multi-load Hydraulic System

With the increasing shortage of global energy,energy conservation and consumption reduction has long become the consensus of mankind.General hydraulic systems often use quantitative pumps to drive the valve control system,so that the system efficiency is low,most are less than 40%,mainly due to the system overflow and throttling loss.In addition,the pump control system driven by variable pump,although there is no overflow loss,the efficiency is improved,but the accuracy of speed regulation is reduced,and to achieve the work needs of the system,it is necessary to increase the speed of the valve control system,so that the efficiency of the whole machine is reduced.In order to further match the output pressure and flow of the power unit with the demand of the load actuator,more and more enterprises use inverter technology servo motor to drive the quantitative pump scheme,which has been developed into advanced high-performance energy-saving system in recent years.In this paper,the energy saving of the power unit of the multi-load hydraulic system is studied in detail,and the research results are applied to the hydraulic auxiliary system of 1700 mm tandem cold mill.The main work contents are as follows:(1)Through a large number of literature reading energy-saving development analysis of multi-load hydraulic system,several widely used energy-saving schemes are obtained.Based on the analysis of energy consumption of common multi-load system,the mathematical model of early system is established,and its working principle is analyzed,three typical multi-load hydraulic systems are given,and the corresponding mathematical model of system efficiency is established.(2)According to the basic principles of fluid mechanics and hydraulic transmission,the mathematical models of three power units,namely constant pressure quantitative pump,load sensitive pump and servo motor pump control system,were presented,and the parameters of the relationship between the parameters of the simulation module were calculated in detail,which provided a theoretical basis for the subsequent dynamic simulation research.(3)Using hydraulic simulation software AMESim,the establishment of simulation model of the three schemes of multiple fixed load and variable load and three kinds of mixed load simulation research was conducted on the hydraulic system,the system analyzed the changes of energy consumption and efficiency,the results show that the servo pump controlled hydraulic power unit energy saving scheme of optimal effect.(4)Through the previous literature review and the use of plant resources data of1700 mm rolling mill to further on the specific simulation analysis was made on the energy consumption situation of auxiliary hydraulic system,the data is applied to the system parameter Settings and the relationship of various modules,the day before the proposed method is validated through actual three and the effectiveness of the proposed scheme of the power unit.(5)According to the engineering requirements to be met by the hydraulic system equipment of multi-load rolling mill,the servo motor technology controlled by PID and modeling were used to design and optimize the hydraulic auxiliary system of energy-saving multi-load rolling mill.Then the influence of the pipeline length from the oil pump port to the valve section on the response speed and energy consumption of the system is studied through simulation,so as to improve the working performance of the hydraulic system and provide reference for improving the efficient stability of the hydraulic system actuator.