Research on wear prediction of disc cutter based on friction work principle

As the main rock breaking tool of tunnel boring machine, the wear of disc cutter is affected by geological conditions, equipment factors and tunnelling parameters when it interacts with rock. Because of the complex factors affecting the disc cutter wear, it is difficult to accurately predict the wear of disc cutter. Firstly, the rock breaking mechanism and the force of disc cutter were analyzed, a theoretical prediction model of disc cutter wear is established based on the principle of friction work. Then, The parameters in the disc cutter wear prediction model can be determined by simulation and a prediction method of disc cutter wear based on friction work is proposed. Finally, the wear prediction model of disc cutter is verified by field wear data of disc cutter. The results show that the average error between the predicted value of disc cutter and the actual wear data of construction site is 16.1%. The wear prediction model of disc cutter has good accuracy and adaptability. The research results provide an effective method for wear prediction of disc cutter, which is of great significance and engineering value for cutter replacement and construction management.

Optimum Design and Application Research of Eddy Current Sensor for Measurement of TBM Disc Cutter Wear

In view of the fact that the mature eddy current sensors on the market have a small measuring range and a certain requirement for the measured conductor area, which cannot meet the requirement of TBM disc cutter Wear monitoring, Ansoft Maxwell simulation was used to optimize the coil geometry parameters and circuit structure of eddy current sensor in this study. A special sensor for measuring disc cutter wear was designed, and the feasibility of the design was verified by measuring a 17-inch disc cutter. The results indicate that the linear range of the eddy current sensor is 35 mm under the condition that the measured blade width is 19 mm, which can meet the requirement of disc cutter wear measurement and provide monitoring data for real-time disc cutter wear monitoring system.