Real-time detection method for wear condition of cross section disc hob of hard rock driving machine

Abstract

The invention relates to a real-time detection method for the wear condition of a cross section disc hob of a hard rock driving machine, and relates to a tunnel driving equipment construction technology. Through mechanical analysis of the contact action of a hob and hard rocks, by using a finite element simulation method, with the help of a friction and wear simulation test and a hob-hard rock linear cutting experiment, and the relationship between hard rock tunnel construction parameters, rock mass joint characteristic parameters, driving parameters, cutter tool arrangement structural parameters and rock mass mechanics and material parameters are established; and the hard rock driving machine detects the wear state of the single blade cross section disc hob on arbitrary front face of a cutter in real time in the driving process of geologies with different rock mass and rock characteristics, and the defects that an effective technological means of real-time detection of the cross section disc hob lacks in the prior art according to different rock mass joint structures, different cutter arrangement characteristics and the tool configuration characteristics are overcome.

Description

technical field [0001] The technical scheme of the invention relates to the construction technology of tunnel boring equipment, in particular to a real-time detection method for the wear condition of a constant section disc hob of a hard rock tunnel boring machine. Background technique [0002] In the construction of hard rock tunnels, the constant section (abbreviated as CCS) disc hob has become a hard rock tunnel boring machine (abbreviated as TBM) for its efficient rock breaking ability and good wear resistance. Rock-breaking knives widely used in the world. However, in the construction process of hard rock tunnel boring machine, the high strength and high hardness rock makes the problem of tool wear very serious, and tool wear has become an important factor that plagues the safety and efficiency of hard rock tunnel boring machine construction. Due to the harsh working environment of the hob, the special joint structure of the rock mass, and the complex rock destruction ...

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Problems solved by technology

[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 tunnel boring machine’s tunneling parameters are interrelated, and predicts the change of tunneling parameters by analyzing the However, this real-time calculation method lacks the application of the inherent laws of the hob wear evolution process, and it is difficult to accurately predict the intermediate process of tool wear evolution.

CN201610771253.8 discloses a method for estimating the weight and wear amount of a disc hob with a constant cross section of a hard rock tunnel boring machine. The method uses the normal thrust load of the disc hob to predict the tool wear, but it has the normal direction of the disc hob The thrust load is difficult to truly reflect the force on the contact element when the hob breaks rocks, which affects the accuracy of the estimated results

CN201710910463.5 discloses a method for predicting the wear condition of a constant section disc hob of a rock tunnel boring machine. The method analyzes the mechanical process of the hob in contact with the rock. However, the method lacks rock friction properties and rock mass joints in the analysis process. The research on the influence of spacing on the mechanical process of contact friction and wear, and the corresponding experimental research did not fully consider the influence of joint inclination angle and coupling effect of joint spacing, so the coefficients of the calculation model need to be further adjusted according to the actual construction data, which affects the accuracy of the prediction results sex

[0004] In short, in the actual excavation of hard rock tunnel boring machines, the special joint structure of hard rock mass will change the mechanical properties of rock mass, weaken the bearing capacity of rock mass, and lead to more complex and diverse force conditions for cutters. Body joint structure, different cutterhead layout characteristics and cutter configuration characteristics, and the lack of effective real-time detection of the wear of constant cross-section disc hobs.

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