Introduction to the working principle of ultrasonic bolt stress detector

The measurement technology of the ultrasonic bolt stress detector is developed according to the theory of acoustic elasticity. According to the relative theory of acoustic elasticity, when the ultrasonic shear wave and longitudinal wave propagate along the bolt axial direction, the ultrasonic propagation time has a certain linear relationship with the axial stress of the bolt. The detection system accurately measures the propagation time of the ultrasonic shear wave and longitudinal wave along the axial direction of the bolt and brings in relevant parameters to indirectly calculate the value of the axial pre-tightening stress of the bolt.
The measurement system is equipped with stress parameters calibrated by tension tests for several kinds of bolts with different strengths and specifications, which can be widely used in the measurement of bolt axial stress in various bolted connection structures. The system software has high measurement accuracy, friendly interface, simple operation, high degree of hardware system integration, small size and easy to carry, and can be widely used in aerospace, bridge construction, wind power, thermal power, hydropower, petrochemical and other industrial fields The installation site inspection, in-service inspection, online monitoring and other construction processes.
Performance characteristics of ultrasonic bolt stress detector:
The ultrasonic measurement technology of bolt axial tightening force is developed according to the theory of acoustic elasticity. According to the relative theory of acoustic elasticity, when the ultrasonic shear wave and longitudinal wave propagate along the bolt axial direction, the ultrasonic propagation time has a certain linear relationship with the axial stress of the bolt. The detection system accurately measures the propagation time of the ultrasonic shear wave and longitudinal wave along the axial direction of the bolt and brings in relevant parameters to indirectly calculate the value of the axial pre-tightening stress of the bolt.
The measurement system is equipped with stress parameters calibrated by tension tests for several kinds of bolts with different strengths and specifications, which can be widely used in the measurement of bolt axial stress in various bolted connection structures. The system software has high measurement accuracy, friendly interface, simple operation, high degree of hardware system integration, small size and easy to carry, and can be widely used in aerospace, bridge construction, wind power, thermal power, hydropower, petrochemical and other industrial fields The installation site inspection, in-service inspection, online monitoring and other construction processes.
Technical parameters of ultrasonic bolt stress detector:
Measurement Mode: Pulse Echo (Standard)
Measurement frequency: 2.25M, 2.5M, 3.5M, 5M, 10M
Measuring range: bolt diameter ≥ 8mm
Acoustic time detection accuracy: ±10ns
Bolt tightening force detection accuracy: ≤±5%
Working temperature: -20℃~+50℃
Dimensions: 260mm (length) x 185mm (width) x 75mm (thickness)
Machine weight: 2.77kg