Wear detection-based online detection method for rotation state and chord wear of hob of shield/TBM

Abstract

The invention discloses a wear detection-based online detection method for a rotation state and chord wear of a hob of a shield / TBM. Whether the hob rotates or not, whether the hob generates chord wear or not, and a chord wear state are judged according to detected hob state signal change characteristics. The method comprises the following steps: in a normal running wear state of the hob, acquiring a signal and calibrating a time-based change curve a of the signal; fitting out a time-based change curve b of the acquired signal of the hob in an actual working condition; analyzing a change ruleof the curve b, and judging whether the hob rotates or not; performing correlation analysis on the curve a and the curve b, and judging whether the hob is in normal wear or not; and increasing a sampling frequency, fitting out a time-based change curve c of the acquired signal, and judging whether the hob generates the chord wear or not and the edge number of chord wear. On the basis of an existing wear detection device, other detection devices are not additionally arranged, and by directly analyzing the signal acquired by the wear detection device, the rotation state of the hob and whether the hob generates the chord wear or not are judged, so that the detection method is simple and reliable.

Description

technical field [0001] The invention belongs to the field of tunnel construction machinery, and in particular relates to an on-line detection method of a shield / TBM hob rotation state and a string mill based on wear detection. Background technique [0002] Full-face tunnel boring machine (shield tunnel boring machine / TBM) is a large-scale tunneling equipment that integrates electromechanical and hydraulic automation and can realize continuous operations of tunneling, moving, mucking and lining. It is widely used in Hydropower, railway, highway, subway and other engineering construction. When excavating in hard rock formations, the tunnel boring machine mainly relies on the hob installed on the cutterhead to roll and break the rock under the action of strong thrust and torque. The hob bears a large load when breaking rocks. Under the load, the hard wear-resistant particles in the rock squeeze the surface of the grinding cutter ring, causing the hob to wear. The main wear fo...

AI Technical Summary

Problems solved by technology

The above patents and methods all have certain limitations. If multiple detection devices such as eddy current displacement sensors, magnetoelectric speed sensors, and acceleration sensors need to be installed, the judgment and detection methods for each wear condition are relatively complicated and not straightforward enough; The detected signal is calculated and converted, and the relevant judgment can only be made after the wear amount or rotational speed is obtained. The processing speed affects the accuracy and timeliness of real-time detection; the specific number of string grinding edges in the multilateral string grinding state is not judged, etc.

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