A probe and method for measuring the pretightening force of transmission tower bolts with temperature compensation

Abstract

The invention discloses a probe and method for measuring the pre-tightening force of electric tower bolts with temperature compensation. The measuring probe includes a casing, a fixing ring arranged in the casing, a temperature sensor, a cylindrical longitudinal wave ultrasonic piezoelectric ceramic chip, a cylindrical Shaped transverse wave ultrasonic piezoelectric ceramic wafer, the cylindrical transverse wave ultrasonic piezoelectric ceramic wafer is arranged in the middle of the shell and is attached to the bolt, and the cylindrical longitudinal wave ultrasonic piezoelectric ceramic wafer is arranged in the cylindrical transverse wave ultrasonic piezoelectric ceramic wafer Above the wafer, the fixed ring is arranged on the inner wall of the housing and fixed with the bolts, the temperature sensor is arranged between the fixed ring and the cylindrical transverse wave ultrasonic piezoelectric ceramic wafer and is in contact with the bolts, and the internal gap of the housing is provided with a back lining. The temperature-compensated power transmission tower bolt pretightening force measuring probe of the present invention is convenient to assemble and disassemble with the bolt to be tested, has accurate measurement, and is more suitable for on-line real-time monitoring of the bolt pretightening 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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