Modeling And Simulation Of The Pump Control Hydraulic System Of The Loader Working Device

Loader is a kind of construction machinery widely used in mining, highway, railway, construction, Water conservation and other field. Mainly used for bulk material loading shovel and short-distance transport, also for mild shovel and digging operations on the ore, hard soil, etc. Loader is characterized by mobility, high operating speed and efficiency, easy operation, so it has been widely used in the construction.Conventional loader hydraulic system is valve system, that is, through the control valve to achieve a variety of flow, pressure and direction control.The valve control system has a big loss of throttling, only about35%of the engine power output becomes loader’s effective work, about40%loss in hydraulic components, the rest energy loss in throttle operation, control of the body and the device movement, energy utilization is low.A lot of heat will be generated in the working process, the additional cooling device further increases the total power. Valve system is open loop, has a large quantity use of oil and easy to cause waste oil, causing environmental pollution problems. With the global trend of energy saving as well as people’s awareness of energy conservation, using energy efficiently has become an important research topic in the hydraulic field.How to improve the energy efficiency of mechanical engineering has become a focus to the machinery manufacturers, energy-efficient construction machineries are increasingly favored by consumers, energy-efficient loaders have gradually been the development direction and trends.How to further reduce energy consumption and improve energy efficiency is the starting point and focus of this paper.In order to solve the valve system problems fundamentally, the most effective method is to use pump control technology with no throttling loss.Pump control system is a new kind of load-sensing hydraulic system in recent years. Unlike valve system, the pump control system is mainly controlled by reducing the use of the valve, the main task of the flow adjustment is achieved by the pump, throgh controlling the pump swash plate angle or the speed of the pump, so as to meet the system requirements. Not only obviously reducing the throttling and overflow loss, but also the circuit is simple, reliable and obvious energy-saving.Therefore, the purpose of this project is to reaserch the loader pump control hydraulic system, improve loader’s system efficiency, and achieve the purpose of energy saving.At the same time, this project uses a co-simulation method, which uses dynamics simulation software ADAMS and hydraulic simulation software AMESim, changes the shortcomings of the past single research methods,can fully simulate the real system conditions, the data can transfer real-time between the two software’s interface,Obtain at different times, different conditions the true relationship between driving forces and loads.The results will be more authenticity and timeliness.In this paper, taking ZL50loader working device hydraulic system as the research object,the pump control system as the research methods, improving the efficiency as the goal, doing the reaserch from the theoretical analysis and the co-simulation, the main work is as follows:1. Introduced the loader energy consumption situation briefly,mainly analysed the advantages and disadvantages of valve control hydraulic system and pump control hydraulic system, introduced the pump control hydraulic system in-depth.2.This article introduced two types of new assignment principles, and completed the pump’s Pro/E model, determined the components of hydraulic system, designed the model of pump and working device of pump control hydraulic system in AMESim.3. Described the working principle of the loader’s working device, and established the Pro/E model of loader working device.4. Established the dynamic model for the working device of loader. Imported the Pro/E model to the ADAMS software through the interface module, completed dynamic modeling, simultaneously added constrains and external loads.5. Completed co-simulation by using ADAMS and AMESim software, and analyzed its dynamic performance and energy-saving effecting.6. Summarized the results of the research projects, suggested the improvements and prospected the energy-saving prospects of pump control hydraulic system of loader.