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International Standard Serial Number:
ISSN 1001-4551
Sponsor:
Zhejiang University;
Zhejiang Machinery and Electrical Group
Edited by:
Editorial of Journal of Mechanical & Electrical Engineering
Chief Editor:
ZHAO Qun
Vice Chief Editor:
TANG ren-zhong,
LUO Xiang-yang
Tel:
86-571-87041360,87239525
Fax:
86-571-87239571
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No.9 Gaoguannong,Daxue Road,Hangzhou,China
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310009
E-mail:
meem_contribute@163.com
Abstract: Aiming at the problem of high energy consumption caused by poor stability and large throttling loss of traditional servo motor driven single variable displacement pump system, the differential cylinder system of 37 t hydraulic excavator boom was studied. Firstly, according to the working principle of double pump driving boom control, the scheme of combining servo motor and double constant displacement hydraulic pump to drive the differential cylinder system of boom together was given. The mathematical model of traveling cylinder was deduced, and the three-dimensional mechanical model of hydraulic excavator was established by UG software. Then, the simulation model of 37 t hydraulic excavator boom system was established in the simulation software SimulationX. Finally, the position, speed control characteristics and energy consumption characteristics of the variable speed servo direct control differential cylinder system were simulated and verified by experiments. In order to verify the effectiveness of the above simulation model, a test prototype was built for experiments, and the experimental results were compared with the model simulation results. The experiment results show that the output energy consumption of the boom differential cylinder is respectively reduced by about 40% and 44% in the no-load and on-load conditions. Comparing with the no-load working condition, in the lifting phase under the load working condition, the operation time of the boom is shortened by 1 s, and the lowering phase is prolonged by 0.5 s. The whole working cycle time is reduced by 0.5 s. The results show that the energy consumption and operation characteristics of the system are in line with the expected results.
Key words: hydraulic excavator; single variable displacement pump system; pump control system; position/velocity characteristics; throttling loss; differential cylinder
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