A Control Method for Hob Tool Change of Shield Machine in Composite Stratum

Abstract

The invention discloses a control method for hob cutter change of a shield machine in a composite stratum, which comprises the following steps: 1. dividing the wear grade of the hob; Concentrate the parameters of the second-level evaluation indicators for segmentation; 3. Determine the weight of the first-level evaluation indicators and the second-level evaluation indicators; 4. Determine the fuzzy matrix of each first-level evaluation index; 6. Second-level fuzzy judgment to obtain the membership degree of wear grade; 7. Calculation of the validity of the wear grade membership degree; 8. Judging whether the validity α is not less than 0.5; 9. Determine the current hob wear grade; 10. Control the hob Change the knife. The invention can judge the degree of wear of the hob under different excavation distances without entering into the soil chamber of the shield tunneling machine, and provide a reference for the timing of the cutter change during the construction of the shield tunneling machine. .

Description

technical field [0001] The invention belongs to the technical field of tool change control of shield machine hob, in particular to a control method for shield machine hob tool change in composite strata. Background technique [0002] The shield tunneling method has become the main construction method of current tunnel construction due to its advantages of safety, reliability and high efficiency. Especially in the composite formation, abnormal wear phenomena such as eccentric grinding or tool breakage of the hob often occur, and the tool is easily worn to a state of failure. [0003] During the construction of the shield tunnel, the hob on the one hand rotates with the cutter head, and on the other hand rotates around the cutter axis and squeezes and breaks the rock. The wear is mainly caused by the friction between the hob and the rock. According to the wear mechanism, the wear can be divided into abrasive wear, adhesive wear, fatigue wear and impact wear. Due to the compl...

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Problems solved by technology

[0005] At present, scholars at home and abroad have made many achievements in the research on tool wear status based on hob wear theory and shield tunneling parameters, but the factors affecting hob wear are diverse and complex, and the degree of hob wear cannot be fully judged only by a single factor In the actual situation, the hob wear is affected by the interlacing and overlapping of various factors. The hob needs to be shut down for tool replacement. Too early hob tool change will affect the construction efficiency and delay the construction period. Too late hob tool change will reduce the rock breaking efficiency. , The cutter head is worn or even shut down for repair, which seriously affects the construction progress and increases the construction cost

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