Probe rotary type ultrasonic flaw detection device

Abstract

The invention provides a probe rotary type ultrasonic flaw detection device. An ultrasonic flaw detector is embedded into an ultrasonic rotary machine head in a modularized manner to form an ultrasonic flaw detection module. The ultrasonic flaw detector and the ultrasonic rotary machine head rotate together to remove relative movement between the ultrasonic flaw detector and the ultrasonic rotary machine head; and the ultrasonic flaw detector and the ultrasonic rotary machine head are fixedly connected by a coaxial cable. The ultrasonic flaw detection module can carry out digital processing and compression on a flaw detection signal and then the flaw detection signal is transmitted to a fixed transmitter in a wireless manner; and then the flaw detection signal is uploaded to a computer by the fixed transmitter to be subjected to treatment and waveform display. According to the probe rotary type ultrasonic flaw detection device disclosed by the invention, the contact problem of electric brush coupling and signal attenuation and anti-interference problems of capacitance coupling in a traditional probe rotary type ultrasonic flaw detection device are solved, the signal to noise ratio of flaw detection is improved and the rotary speed of a probe can also be improved.

Description

technical field [0001] The invention relates to the field of detection, in particular to the field of non-destructive detection technology and equipment for metal and non-metal pipes and rods, in particular to a probe rotating ultrasonic flaw detection device. Background technique [0002] At present, the equipment that uses ultrasonic waves to detect flaws in pipes and rods is mainly divided into two categories: one is that the pipe is advanced in a spiral manner while the ultrasonic probe is still; the other is that the ultrasonic probe is rotated while the pipe is advancing in a straight line. [0003] The first type of equipment, pipe spiral advance, is usually used for low-speed pipe flaw detection because it is difficult to achieve stable high-speed rotation mechanically. The second type of equipment can achieve high speed when the probe rotates, and the straight line of the pipe can realize high-speed flaw detection. [0004] In the traditional probe rotating ultraso...

AI Technical Summary

Problems solved by technology

[0005] The brush coupling method is a contact connection. The brush and slip ring are easy to wear and tear, which will lead to poor contact and often cause many interference signals. At the same time, the brush will also vibrate when sliding at high speed, resulting in poor contact. The working speed of the brush method

Capacitive coupling solves the defect of contact connection, but the instrument and the probe are directly connected in series with a capacitor, which is realized by a large-area copper sheet and has a large parasitic inductance, which will cause the attenuation and occurrence of transmitted pulse signals and echo signals Waveform distortion affects the signal-to-noise ratio of flaw detection

Secondly, the introduction of large capacitors is easily interfered by signals such as motors / inverters in an industrial environment, and it is difficult to debug on site

Finally, rotating capacitors have high requirements on machining accuracy. High-speed rotating stages are prone to deformation due to changes in temperature and other environments. Contact with stationary stages will cause capacitor failure and affect capacitor life. Maintenance after failure requires disassembly of the host head, making installation difficult. , high maintenance cost

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