Dimensional design of thrust system with an adjustable layout mechanism in shield machine

Abstract

Due to the heterogeneity of advancing face and the top-heavy structure of main machine, hydraulic cylinders of thrust system in shield machine are subjected to the transverse and longitudinal resistance torque varying in a certain interval which would give rise to bias load. Aiming at resisting unbalance load, a kind of thrust system which can regulate all jacks by a layout adjustable mechanism has been proposed in this paper. Considering the workspace, the limited space in the main machine of the machine and the ultimate strength of lining segments, the synthesis dimensional design for the adjustable mechanism has been studied. Under given the working conditions, the force transmission performance for the thrust system with the ability of adjustable layout has been investigated by virtual prototypes using variation coefficient assessment model. Results shown that the adjusted non-uniform thrust system has a better force transmission performance than prior to the uniform thrust system. It also implies that the regulated arrangement thrust system has the strong ability of decomposing external partial loads and prevention of lining segments. Results would provide theoretical foundation and support for the design of the thrust system with an ability of resisting bias load.

Keywords

• dimensional design
• non-uniform layout
• adjustable layout mechanism
• force transmission performance
• variation coefficient