Abstract: A performance monitoring system for a disc cutter of a tunnel boring machine (TBM) is provided, and includes a disc cutter body, a shaft assembly and an isolation boss; the shaft assembly includes a shaft main body and a bearing spacer located on the shaft main body; a rotating mechanism is arranged in a space between the isolation boss and the bearing spacer; the rotating mechanism includes a rotator and a T-shaped extension support located between the bearing spacer and the rotator; bearing retainers of roller bearings are arranged on two sides of the T-shaped extension support; a ring-shaped grating strip is arranged on one side of the rotator close to the T-shaped extension support; a connecting component is arranged on one side of the rotator away from a rotating bearing; and a sealing assembly is arranged between the T-shaped extension support and the rotator.

Abstract: Provided is a wear detection and displacement device, belonging to the technical field of equipment wear and displacement detection. The technical problem to be solved is how to accurately locate the exact position and damage situation of wearing for the working mechanical equipment, thus improving operating efficiency of the mechanical equipment. An adopted technical solution is as follows: the wear and displacement detection device includes a unidirectional push-forward mechanical structure, one end of which is provided with a non-conducting cutter, and flexible printed circuits (FPCs) are arranged below the non-conducting cutter, and the FPCs are electrically connected to a circuit board. Cutoff signals of the FPCs are obtained through the circuit board, thus obtaining a relative displacement of internal components, upon which a wear condition and wear speed of a mechanical structure are calculated.