The Key Technology Of Excavator Hydraulic Pump-motor Test System Development And Research

In the recent decades, with the economic development, the accelerating pace of infrastructure construction and the successive big project in the process of carrying out, the construction machinery had been used anywhere. Application of construction machinery can reduce labor intensity, cost of operating units so as to improve work efficiency. Excavators, as the most important construction machinery, are applied much more widely now. The hydraulic pumps, motors which are the important parts of excavator’s hydraulic system are usually compared to "heart" and "arm" of the system. The hydraulic pumps and motors are sophisticated and complex hydraulic components. They have lots of performance indicators and parameters, and each parameter has a serious impact on the entire system working state. Hence, it is very important and necessary to do a scientific and comprehensive testing for hydraulic pumps, motors.At the first part, beginning from the stipulated test items and test methods which originates from the test standard of hydraulic pumps, motors formulated by the state, the thesis analyzes the function that the testing system should have, determines the method how to achieve the system on hydraulic principles and the selection of key hydraulic components. It also analyzes the design control system thinking way of hydraulic pump, motor testing system, and compares the advantages and disadvantages of the different controllers and determines the best controlling scheme. Like other industrial products, technology of energy saving, emission reducing has become one of the important research directions in designing hydraulic test system. The thesis studies the way of energy consumption in the testing process. And after analyzing and comparing the different energy recycling program, the thesis proposes the energy recycling proposal which is most suitable for this topic. And it also does some work derivation and quantitative calculation for the energy recycling. Moreover it does some work derivation and quantitative calculation for the energy recycling.In addition, the paper uses the advanced modeling and simulation software AMESim modeled and simulated the hydraulic motors test system. By filtering out the secondary factor and simplifying the hydraulic system, the paper builds the models under AMESim environment, and focuses on the following analysis:the validation of the energy recycling; the matching relation between the tested pump displacement and the load pump displacement; the controlling optimization of the volume of whole heating of the testing system; the influence of the valve block size for the entire system. And the thesis also verifies the feasibility of the power recycling and proves the direction of system for a further optimize.Finally, the paper does a more complete test for the typical Kobelco excavators SK260LC pump and SK200LC swing motor by using the established hydraulic pumps, motors test system. With comparing the curve reports which come from the test and the simulation results, it verifies the validity of the simulation for the test system design.The excavator hydraulic pump, motor test system, the one was designed and developed in this paper meet the system performance requirements; the practical application effect was very good.