Research On Hydraulic Drive System For Cutter Head Of Shield Tunnel Boring Machine

The shield tunneling machine is a type of complicated engineering equipment which is related with subjects of machinery, electronics, hydraulics, measurement and control, and is widely applied in the underground tunnel excavation. Based upon the different kinds of geological conditions, each shield tunneling machine has to be designed and manufactured individually. However, the present design theory and method of the shield tunneling machine are not perfect. Therefore it is necessary to establish a simulator test rig of shield tunneling machine to simulate the tunnel excavations under the conditions of different local geological structures. In this article, a new design theory and a calculation method in the electro-hydraulic control system are proposed to improve the design level of the shield tunneling machine.Based upon the analysis of the working conditions in the tunnel excavations, a principle design, hydraulic value design and system integration design of hydraulic drive system of cutter head for simulator test rig is carried out theoretically with electro-hydraulic proportional control technique. The hydraulic system in the rotate speed of cutter head and the waste of power of different working conditions are analyzed by the simulation and experimentation. The simulation and experimental results show that the system is more efficient by using the hydraulic system of variable displacement to achieve the rotate speed of cutter head. At the same time, the hydraulic drive system of variable speed is designed, too. And by analyzing the principle and simulation, the hydraulic drive system of variable speed can also achieve the rotate speed of cutter head. Comparing the two systems, the hydraulic drive system of variable speed is more efficient and energy-saving. These results will provide the theoretical references for the shield design and manufacture.The work is following as:In chapter 1, the history and current research status of the shield tunneling machine and hydraulic drive system of cutter head are introduced based on a lot of the publications and conference papers. The techniques of hydraulic control of shield tunneling machine are also described. Consequently, the research and the goal of the project are brought forward.In chapter 2, the electro-hydraulic control systems of the simulator test rig are designed with the proportional electro-hydraulic control technique based on the analysis of the shield tunneling machines. The designs include principle's design, parameter's calculation, system choice of element, integration design and valve...