| High-efficiency hydraulic spraying machine is an important part of modern coating industry equipment,and is used in various industrial production from military aircraft carriers to manufacturing buildings.Existing domestic hydraulic spraying machines generally have defects such as large energy consumption,high noise,high working temperature,etc.This article relies on the improvement project of the sprayer products of China Shipbuilding Heavy Industry Yangtze River Technology Co.,Ltd.,and mainly conducts theoretical and simulation analysis on its hydraulic control system,Proposed improvement measures and conducted experimental research,which proved the correctness and feasibility of the improvement.The hydraulic spraying machine is composed of a motor,a plunger pump,a valve-controlled differential hydraulic cylinder,a spray gun,a feed pipe and an oil filter.Most domestic researches on spraying machines focus on nozzle flow field analysis and system component selection design,while ignoring the core actuator that affects its performance: valve-controlled differential hydraulic cylinders.This article analyzes its control system and finds that the performance defects of the product are related to the spool structure of the control valve: the current product control valve adopts a positive cover design.This cover type has a dead zone,which will cause a lot of damage during the spool reversing process.Large pressure shock will not only cause energy loss and increase of system temperature,but also affect the life and reliability of the sprayer.Based on the theory,the hydraulic system model of the spraying machine was built using AMESim software,and the pressure and flow curves of the key positions of the system under the structural parameters of the current product were simulated.The pressure and flow fluctuations in the system under different covering types are compared,and the influence of the valve core covering amount on the pressure shock of the valve port and the energy loss of the pump variable is summarized.It is concluded that selecting a spool with a smaller negative covering amount can achieve the optimal configuration of the system performance.In addition,the influence of parameters such as the length of the high-pressure hose in the system,the response time of the variable pump,the diameter of the valve port,and the nozzle diameter on the characteristics of the sprayer is discussed.After the simulation analysis,an experimental test platform was built to test the pressure and temperature of the key positions of the system during the real-time working process of the current product spraying machine,and the pressure impact and energy consumption of the current hydraulic spraying machine during the working process were obtained.Finally,the zero-covering and negative-covering spools were processed separately,and improved experiments were carried out.The use of negative-covering spools basically eliminated the valve port impact,and the system temperature rise was reduced by 7%,which verified the impact of the improved spool structure on the valve port pressure and the system Improvement of energy consumption.The simulation and experimental results in this article provide a certain basis for the subsequent improvement of the production of sprayer products,and have practical promotion significance for the design of construction machinery using this type of system. |
PDF Full Text Request