Cutterhead mud cake detection method

Abstract

The invention provides a cutterhead mud cake detection method, which comprises the following steps of: establishing a normal data table and a fault data table in a cutter database, and acquiring the temperature of each cutter by using a temperature sensor; according to the measured temperature, predicting the temperature of each point, not provided with the temperature sensor, on the cutterhead, and generating a cutterhead thermodynamic diagram; judging data in the cutter database, if the data is less, calculating a temperature difference value of the cutter, and when the temperature difference value exceeds a preset threshold value, determining that the cutter forms a mud cake, and storing the temperature information of the cutter in a fault data table; otherwise, constructing a convolutional neural network, and training the convolutional neural network by using the data in the fault data table and the normal data table to obtain a convolutional neural network model; and performing image recognition on the cutter head thermodynamic diagram by utilizing a convolutional neural network model, judging whether mud cakes are formed on the cutter head or not, and positioning a specific cutter which is subjected to mud cakes by utilizing a temperature difference method. According to the method, the accuracy of mud cake recognition is improved by combining the temperature difference value and image recognition.

Description

technical field [0001] The invention relates to the technical field of shield machine cutter head detection, in particular to a method for detecting mud cake on a cutter head. Background technique [0002] During the shield construction process, when the shield machine is excavating in hard clay, silty clay, mudstone and other strata, due to the lack of theory and experience knowledge of some shield drivers, the adjustment of the excavation parameters may not be timely, resulting in sticky particles in the stratum. The surface of the cutter head is compressed and consolidated under the thrust of the shield machine, forming a hard mud cake on the cutter. Once the mud cake appears on the cutter head, it will not only reduce the tunneling efficiency of the shield machine, but also cause abnormalities such as stuck rotation and partial wear of the hob, which will seriously damage the cutter and reduce the service life of the cutter head. [0003] During the shield construction ...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the technical problem that the existing method for judging the mud cake on the cutter head cannot realize the precise positioning of the cutter and the calculation is complicated, the present invention proposes a method for detecting the mud cake on the cutter head, which can quickly identify the shield machine through image recognition and temperature difference. Whether there is mud cake on the cutter head during the excavation process, and quickly determine the position of the tool where the mud cake occurs, so as to avoid the life of the cutter head and the tool life being reduced due to mud cake jamming and partial wear, etc., and improve the tunneling efficiency of the shield machine. Guarantee the safe and stable operation of the shield machine

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