Power transmission tower bolt pre-tightening force measuring probe and method with temperature compensation

Abstract

The invention discloses a power transmission tower bolt pre-tightening force measuring probe and method with temperature compensation, wherein the measuring probe comprises a shell, and a fixed ring,a temperature sensor, a cylindrical longitudinal wave ultrasonic piezoelectric ceramic wafer and a cylindrical transverse wave ultrasonic piezoelectric ceramic wafer which are arranged in the shell. The cylindrical transverse wave ultrasonic piezoelectric ceramic wafer is arranged in the middle in the shell and attached to a bolt, the cylindrical longitudinal wave ultrasonic piezoelectric ceramicwafer is arranged above the cylindrical transverse wave ultrasonic piezoelectric ceramic wafer, and the fixed ring is arranged on the inner wall of the shell and fixed to the bolt. The temperature sensor is arranged between the fixed ring and the cylindrical transverse wave ultrasonic piezoelectric ceramic wafer and makes contact with the bolt, and a backing is arranged in a gap in the shell. Thepower transmission tower bolt pre-tightening force measuring probe with temperature compensation is convenient to assemble and disassemble with a bolt to be measured, accurate in measurement and moresuitable for carrying out online real-time monitoring on the bolt pre-tightening force.

Description

technical field [0001] The invention belongs to the field of health monitoring of bolted connection structures of electric transmission towers, and in particular relates to a probe and method for measuring the pretightening force of bolts of electric transmission towers with temperature compensation based on the ultrasonic thermoacoustic elastic effect. Background technique [0002] The power transmission system is one of the important strategic projects of the country. The connection structure of the transmission tower is the key hardware carrier of the system. Its own service safety and reliability largely depend on the connection strength of the bolt structure. The stiffness and damping characteristics determine the static strength and dynamic strength characteristics of the overall structure of the transmission tower, and its stiffness and damping characteristics are closely related to the preload of the bolted structure. During the service stage after the pre-tightening...

AI Technical Summary

Problems solved by technology

However, this patent is only based on ultrasonic longitudinal wave single-wave signals, and the bolt stress measurement data needs to be calibrated to the reference state every time it is tightened, which is difficult to meet the technical requirements for the health status monitoring of bolts in service

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