Hydraulic system design for hydraulic system
Abstract
Hydraulic excavator is the main construction machinery in the field of engineering construction. As hydraulic technology is the foundation of modern excavator, it has a direct impact to the working performance of the machine.The hydraulic system of arm on SY215C8M type excavator provided by SANY is regarded as the research object. The paper firstly introduces the basic composition and common loop of hydraulic excavator and emphatically discusses the analysis of hydraulic system based on energy recovery. Through comparing traditional energy recovery system, a new energy recovery system of arm on hybrid hydraulic excavator is put forward. The tentative analysis of the mathematical modeling and simulation is also carried out.
The main work is as follows:
1.The paper summarizes the development and research status of the hydraulic system of excavator. Then it detailedly introduces the hydraulic circuit of typical movements on the basis of analysis on the operation condition of hydraulic excavator, which builds a solid theoretical foundation for the energy recovery system of arm on hybrid hydraulic excavator.
2.On the basis of today’s mature hybrid technology, considering the conditions of excavators’ own characteristics, the principle of hydraulic systems is flexibly used to design a new energy recovery system based on hydraulic motor-generator unit.
3.After determining the schematic diagram of arm energy recovery system, a control strategy of arm lowering energy recovery system is further proposed. The control strategy has significant importance to determining the mode of operation and analyzing the working performance. Finally, the energy recovery unit is modling and simulated, which is beneficial to optimizing the system furtherly.
Key Words: Hydraulic System;Hydraulic Excavator;Hybrid;Boom;Energy Recycling