Design Method Of Segment Erector Mechanism For Shield Machine

Shield tunneling method has a widespread application. With the support of National Key Basic Research and Development Scheme, a comprehensive research on segment erector which is used in segment lining for the new surface during shield tunneling is developed. The research in this paper mainly includes three aspects, as followed.1 Type synthesis and performance analysis of segment erector mechanismTo make the segment lining faster and better, the segment erector is required to undergo the multidimensional movements which include three main movements: namely translation along the axis; translation along radial, gyration and three orientation adjustable movements: traversing, pitching and deflexion. Base on the different motion patterns, the mechanism is confirmed and the kinematics analysis is performed. Also, the kinematic equations are verified. At last, a new type of segment erector with 2-DOF spherical parallel mechanism is proposed.2 Force analysisThe driven oil cylinders include traversing oil cylinders, lifting oil cylinder, pitching oil cylinders and deflexion oil cylinders. The analysis is aimed at the turning platform, left and right lifting beam, gyration body and translation mechanism.3 CAD modeling and examplesThe CAD model of shield machine and segment erector are built up with the software Pro/engineer. The working process is also simulated. According to the kinematic equations obtained from chapter 2, the force equations about the driving from chapter 3 and the dimensions of the parts from chapter 4, an example is given. Through the software Maple, the curves about the force on the driven oil cylinders are drawn during the machine making the gyration movement and the adjustable movement.All the analysis above lay foundation for the design of segment erector mechanism and the strength design of hydraulic cylinders structure.