Prediction method of wear condition of constant section disc hob of rock tunnel boring machine

Abstract

The invention discloses a forecasting method for the abrasion condition of a rock-tunnel-tunneling-machine constant-cross-section disc cutter, and relates to the construction technology of tunnel tunneling equipment. Six mutual relationships between various relevant parameters in tunnel construction are determined in real time, wherein the mutual relationships between the cutter-disc rotating speed n, the tunneling rate v, the cutter-disc torque T, the cutter-disc pushing force F, the drilling footage delta, the cutting coefficient C, the slipping rate s, the sliding distance l, the contactstress P and the cutter-weight abrasion capacity G of a rock tunnel tunneling machine and the weight abrasion capacity G of a No.i front single-blade constant-cross-section disc cutter on a cutterdisc are determined to achieve real-time forecasting of the abrasion condition of the front single-blade constant-cross-section disc cutter of the cutter disc at different installing positions. The defect that in the prior art, effective technological means for directly detecting abrasion of the constant-cross-section disc cutter are lacked is overcome.

Description

technical field [0001] The technical scheme of the invention relates to the construction technology of tunnel boring equipment, in particular to a method for predicting the wear condition of a constant section disc hob of a rock tunnel boring machine. Background technique [0002] The disc-shaped hob with constant section has high rock-breaking efficiency and long service life, and has been widely used in rock tunnel boring machines. Due to the high strength and hardness of rock, the problem of tool wear of rock tunnel boring machine is very serious in the process of rock geological construction. Frequent tool replacement not only delays the construction period, increases construction costs, and becomes an important factor that plagues construction safety, but also reduces the rock-breaking ability and increases energy consumption after the tool wears out. Once the wear limit is exceeded, the tool damage is irreparable and even endanger Therefore, the real-time detection of...

AI Technical Summary

Problems solved by technology

Frequent tool replacement not only delays the construction period, increases construction costs, and becomes an important factor that plagues construction safety, but also reduces the rock-breaking ability and increases energy consumption after the tool wears out. Once the wear limit is exceeded, the tool damage is irreparable and even endanger Therefore, the real-time detection of the tool wear status of rock tunnel boring machines has become an urgent need to improve tunneling efficiency, avoid construction failures, and save construction costs.

[0003] CN201510617860.4 discloses a real-time calculation method for the wear amount of disc hobs of hard rock tunnel boring machines. The method takes into account the factor that the change of hob geometric radius and the change of TBM tunneling parameters are interrelated, and predicts the hob by analyzing the changes of tunneling parameters. The change of the geometric radius can achieve the purpose of predicting the wear degree of the hob. However, it ignores the analysis of the internal mechanism and law of the hob wear evolution process, and it is difficult to accurately predict the intermediate process of the tool wear evolution.

CN201610771253.8 discloses a method for estimating the weight and wear of disc hobs with constant cross-section for hard rock tunnel boring machines. The normal thrust load of the disc-shaped hob and the mechanical parameters of the material are used to predict the tool wear process. However, the normal thrust load of the disc-shaped hob cannot truly reflect the force on the contact micro-element when the hob breaks rocks, which affects the prediction results. flaws in accuracy

In short, due to the harsh working environment of the cutter and the complicated rock-breaking process, there is still a lack of effective technical means to directly detect the wear of the constant-section disc hob.

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