Research On Key Technologies Of New Variable Pressure Energy Saving Flow Commutator

As a key component in the current flow-coupled constant voltage network to achieve energy-saving purposes,hydraulic transformer has become one of the hot issues in the hydraulic industry at home and abroad.However,in the face of complex working conditions,especially when the load changes,it is difficult for the hydraulic transformer to adapt to the speed change of the actuator in time,which will not only cause the system to malfunction,but even cause a serious safety hazard.In view of this,based on the theory of hydraulic transformer and load-sensing control technology,in order to improve the performance of existing hydraulic transformers,a variable-pressure energy-saving flow commutator suitable for flow coupling network is proposed.The key technologies have been studied theoretically and experimentally.The main research contents are as follows:Firstly,on the basis of consulting a large number of domestic and foreign related literatures,the advantages and disadvantages of hydraulic transformers and load-sensing control technologies are expounded.Combined with the problems in the use of hydraulic transformers,a new variable-pressure energy-saving flow commutator is proposed.Combined with different working conditions,the structure and working principle of the device are elaborated.According to its structural characteristics,the mathematical model of the device is built.The influencing factors of the response speed of the device are analyzed when the load changes.The variation law between the displacement of the valve core and the hydraulic parameters of the rotary control valve is discussed.The control of the steady flow rate obtained by the actuator when the position of the valve core changes is studied.Secondly,according to the principle of variable pressure and energy-saving flow commutator,AMESim is used to model and simulate it,and the response and output characteristics of the device are analyzed when the load changes step and sinusoidal,which further proves that the device not only has strong adaptive adjustment ability,but also has good sensitivity when the load changes.Finally,an experimental system is designed andbuilt to verify the correctness of the proposed flow commutator device when the step load changes.The research in this paper is not only the exploration of the energy-saving control method of the existing secondary-regulated hydrostatic transmission system,but also the supplement of the basic theory of hydraulic transformers.It is also a useful attempt for the practical application of hydraulic transformers.The research content is of great significance.