Simulation Analysis And Performance Research On Hydraulic System Of Lifting Machinery

As a kind of mobile lifting machine,truck crane is widely used in construction machinery.Its main function is responsible for the rise and fall of the load,so the standard to measure the performance of lifting machinery is the degree of completion of the system under rising and falling conditions.In practical applications,when a crane works,it usually cannot be put in place at once,and it needs to be constantly adjusted for its position.When the braking of the lifting system rises again.Due to the leakage,compression and lack of construction time of hydraulic oil in the system,the load will appear two times to rise and fall.When the load drops,traditional balance valve back pressure based on rated load gravity setting.When the load quality is less than the rated load,the hydraulic pump needs to output more pressure to help load balance the back pressure,resulting in power waste.Taking the hydraulic system of 16 t crane in a company as the model,this paper studies and analysis the problem of power loss in the lifting hydraulic system,which is as follows:1,A comprehensive investigation of the hydraulic system of automobile crane,and through the review of literature,Internet search,practical parameter inquiries and other ways to understand the crane hydraulic system.Then analyze the ways and means to solve the problems existing in the hydraulic system at the present stage.2,According to the selected model of the crane lifting hydraulic system,calculate the parameters of each component in the system.And the mathematical model of lifting hydraulic system is established.3,The lifting system is analyzed by using AMESim hydraulic simulation software.According to the hydraulic system schematic diagram in the hydraulic simulation software HCD Library modeling,and to built model for selection and parameter setting.Simulated crane lifting and descending conditions of crane and analyzing the factors affecting the dynamic characteristics of the system.Verify the matching of brake delay time and load quality and the valve opening degree of balance valve on the system dynamic characteristics of the impact.4,Improvement of hydraulic system based on original model.In the lifting condition,theload is divided into three levels,and the method of connecting the constant pressure oil source with the electromagnetic commutator valve is used to replenish the brake oil.The torque sensor is converted into electrical signal and set the appropriate delay time.The electrical signal is transported to the electromagnetic commutator valve to control the input time of the constant pressure oil source and control the opening of the brake.In the descending condition,the sensitive balance valve is used to change the output pressure of the system through the change of throttle hole of the main valve,so as to reduce the effect of energy consumption.Finally,a potential energy recovery scheme for flow reuse is proposed.In the past,researchers studied the unilateral conditions of ascension or descent.In this paper,two kinds of working conditions are synthesized to optimize the lifting hydraulic system and solve two problems in the same crane.Improves the performance of the system and also plays an energy-saving effect.It provides the theoretical basis for future research and manufacture and has good practical significance.