Study On Energy-saving Technique For Slewing System Of Hydraulic Excavator

Engineering machinery plays an important role in the construction of the world today. Excavators are mainly used for earth-rock excavation, and are in wide range of application in many fields such as construction, mining, irrigation, military engineering and so on. The low utilization rate of fuel and bad emissions during operation of the excavator has become a common problem. Studies on energy conservation of excavators for improving the effective utilization of resources and reducing pollution are significant.In this paper, starting from the energy conservation of the hydraulic slewing system of the excavator, a full analysis of the slewing system and the whole excavator is conducted. Different energy-saving programs are worked out, and a comparison is made of the effects of them. The main works done are as follows:First, the research actuality is analyzed and discussed of today’s energy conservation of hydraulic excavators, especially the composition and characteristics of hydrostatic transmission’s secondary regulation system, providing the theoretical basis for the design of slewing system based on secondary regulation system.Second, starting from the actual working conditions, load changes and motion characteristics of the hydraulic excavators, a systematic analysis of the dynamic state during the rotation is taken, preparing for the subsequent parameter settings of the system. Modeling and simulation researches on the slewing system are conducted at the same time by AMESim, analyzing the main causes of the energy loss and the value of recyclable energy in theory.Thirdly, for the problem of energy loss in rotating brake, a new type of slewing system relied on a energy accumulator to store or release energy is come up. By analyzing different options, the type and performance parameters of the energy accumulator and key hydraulic components are chosen and calculated. The control plan of the accumulator’s charging and discharging process is determined, and is simulated by AMESim, for its energy-saving effect calculation and comparison.Finally, the principle of secondary regulation and control systems were analyzed. By taking application of secondary regulation in slewing system, a new type of slewing system relied on secondary regulation and its control plan are designed. Meanwhile, mathematical models of the key hydraulic components are built up and linearly simulated by AMESim. A comprehensive comparison is taken of the energy- saving effect of different systems.