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Small hydraulic excavator throttle the main valve ( boom and bucket joint United ) Analysis and Research

Author: ChenYong
Tutor: GuoYong
School: Central South University
Course: Mechanical Design and Theory
Keywords: mini-hydraulic excavator throttling multi-control valve AMESIM orifice area simulation
CLC: TU621
Type: Master's thesis
Year: 2007
Downloads: 109
Quote: 2
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Abstract


Multi-control valve is one of the most important determinants of the performance of the hydraulic excavator, which mainly controls the action direction and flow rate of the performance organs with reasonable way. Considering that the research work on multi-control valve is lacking and the demands of it is great ,Combining the engineering practice ,under the premise that the pump’s flow rate characteristics and the outside load are the known quantities and the machine’s dynamic influence upon the main valve’ pressure are neglected, this paper has done some research work on the multi-control valve which is used in hydraulic throttle system, according to the steps which is theory analysis, simulation research and experiment research.Firstly, some theory analysis about the throttle system which used in the mini-excavator has done, the static characteristics was gotten ,the machine characteristics equation and rigidity equation were obtained, the connection way of hydraulic circuit was analysed .And then, the analysis on multi-control valve has been researched. Three typical and important orifices have been researched detailedly and deduced its orifice area calculation expression by using mathematical knowledge. the orifice area calculation expression program has been compiled using matlab. The simulation model of the hydraulic system when boom works has been built by using AMESIM(Advanced Modeling Environment for simulation of engineering systems). It was confirmed that the simulation model is reasonable after comparing the simulation results and real testing results, and also its meaning for further research. Meanwhile, the simulation model when boom and bucket work together was built.Finally, In order to verify the above theoretic research,the experiment research was done by solving a real problem which happened in a mini-hydraulic excavator in a company. The experiment result shows that the the theoretic research is right,and it can provide guide to the design of throttling multi-control valve in future.

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