| With the rapid development of economic, railways, subways,water project and other underground projects are gradually increasing, the demand of these projects for shield machine is growing. The shield machine mainly rely on the tool mounted on the cutter cutting rock to complete the excavation process. In the tunneling process,hob arranged according to certain rules, hob cutting rock, rock cutter bear reaction,the tool will inevitably impact and abrasion.When the rock crushing effect poor and can not be adjusted, hob and cutter stress concentration, accelerated wear,which not only will affect the quality of the project but will delay the construction period. So to understand the force characteristics of the hob and the process of rock breaking accurately,has a great significance for the smooth construction of the shield.In order to improve the hob limit load, this paper designed a new heavy hob,sliding bearings instead of rolling bearing,and verified the feasibility of the method by calculation, and greatly increased the hob axial and radial load carrying capacity.According to the actual requirements of the new heavy hob parameter check,the results meet the design requirements.Using the display dynamics software LS-DYNA to simulate the hob cutting knife spacing rocks under different dynamic process, the result is consistent with the actual process of breaking rock; determine the optimum blade pitch by comparing different blade pitch hob under the force characteristics and examples.Combined with hob on a certain type of TBM cutterhead arrangement,completed by MATLAB software programming arrangement position hob wiring diagram to verify the spiral arrangement of law rules of the hob, the tool layout is optimized optimization and the result is obvious.Completed the ensemble modeling cutter, use ANSYS/Workbench software to complete the modal analysis and under different conditions of stress and strain analysis,get the cutterhead large stress and strain concentration point. |
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