Research On New Disc Cutter Box Of Shield Machine And Force Analysis Of Cutter-Head

With the development of economic,railways,subways and water projects are gradually increasing,the demand for shield machines is also growing.During the construction process,the wear of shield cutters is serious,and traditional manual tool changer job risk,long cycle,high cost.With the maturity of robotics,the automatic tool change technology of robot arm is put forward.The current disc cutter installation method is only suitable for both hands of workers,so it is not suitable for the application and development of automatic tool change technology.In order to release the operator of shield cutter,this article will study from the following two aspects.First,the design of a new disc cutter box structure to promote the development of automatic tool changing technology.On the other hand,research force condition of cutter-head,and optimize it to improve the service life of cutter-head and disc cutters,reduce the frequency of tool change.The rock breaking mechanism and force prediction model is analyzed in this paper.According to the structural characteristics of the existing disc cutter installation,the basic flow of the manual tool change,the working characteristics of the manipulator and so on,the basic ideas and requirements of disc cutter box design are determined.Application of SolidWorks completed the new disc cutter box structure design,and the design scheme is compared and selected.According to the final disc cutter box scheme,an end-effector of the tool changing manipulator is designed.The installation and working process of the new disc cutter box structure belong to the problem of contact non-linearity.The static analysis of the disc cutter box should be carried out by using the powerful nonlinear solving function of ABAQUS.The static analysis of the different working states about the end-effector of the tool changing manipulator is carried out by using ANSYS WorkBench.Verify the structural strength and stiffness of disc cutter box and end-effector.Multi-objective genetic algorithm is used to optimize the installation position of disc cutter on cutter-head.Research on the rules of tool arrangement of cutter-head and generalized the basic method and principle of cutter arrangement.Force analysis of cutter-head,taking the radial unbalance force and the overturning moment as the objective function,the mathematical model of cutter head layout optimization for shield machine with nonlinear constraints is established.Taking the cutter-head of a certain type of shield machine as an example,the optimization program of multi-objective genetic algorithm of cutter-head was established by MATLAB,and the position of 9 edge disc cutters was optimized.Using SolidWorks to establish the cutter-head model before and after optimization,and simplified appropriately.Using ANSYS WorkBench static analysis of the cutter-head,the stress and deformation results of the cutter-head before and after optimization are compared,and the optimization effect is obvious.Modal analysis of the cutter head,the mode shape and natural frequency before and after the cutter-head optimization are compared to prevent the resonance phenomenon in the working process.The research content in this paper is helpful for advancing the development of automatic tool changing technology,improving the service life of cutter-head and disc cutters,and freeing the tool changer from heavy labor.It has a certain theoretical value and practical guiding significance.