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Research on Excavator Working Device Mechanical-Hydraulic System and Analysis of Digging Conditions Energy Consumption

Author: GuanWei
Tutor: ChenQianGen
School: Central South University
Course: Mechanical Engineering
Keywords: hydraulic excavator working device AMESim simulation energy consumption of digging conditions
CLC: TU621
Type: Master's thesis
Year: 2013
Downloads: 27
Quote: 0
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Abstract


Energy-saving and operational efficiency of hydraulic excavator is an important aspect to measure its performance. Working device appear low speed and energy consumption hydraulic system is high for complex digging of hydraulic excavator. These problem affect the energy consumption and operating efficiency of excavator. To reduce the energy consumption and improve the efficiency in digging condition for excavator, the paper took medium-sized hydraulic excavator mechanical-hydraulic system as the object, researched on dynamic characteristic and energy consumption of the system. The main research work as follows:The article summarized conservation significance of excavator and typical energy-saving control system.Then,give a summary of the excavator working device valve control system and its energy consumption research.In this paper, The basic principle and characteristics of hydraulic excavator pump, multi-way valve and negative flow control system was analysised detailly. The mathematic model of a negative flow control system was created based on the above analysis. The compound action coupling mechanism of working device was illustrated through the analysis about variable pump source and dual-valve system characteristic. Then, set up working device kinematic model,it laid the foundation for wording device system simulation model.The simulation model of hydraulic system major function element was set up and analyzed deeply. The simulation model of hydraulic excavator working device mechanical-hydraulic system was built up. Then by comparing the simulation results with experimental results, the accuracy of the model was verified.Based on the model,this paper studied the typical digging condition of excavator and energy consumption, got the result about dynamic response of digging and distribution of the digging energy consumption. It shows that throtting losses which contain priority valve generating and overflow loss is large.Then the hydraulic system circuit was improved based on the above result and compared energy consumption of these two hydraulic system. The result show that the energy consumption of priority valve declined and bucket cylinder speed increased in the optimized hydraulic system.The new hydraulic system is more energy-saving.

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CLC: > Industrial Technology > Building Science > Construction machinery and equipment > Earthwork machinery, mining machinery > Excavator
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