Magnetic fluid sealing local water soaking type ultrasonic detection instrument and detection method thereof

Abstract

The invention discloses a magnetic fluid sealing local water soaking type ultrasonic detection instrument and a detection method thereof. The detection instrument consists of a space curve surface scanning unit and a local water soaking type ultrasonic flaw detection unit, wherein the space curve surface scanning unit consists of a six-freedom-degree mechanical arm and a control system; the local water soaking type ultrasonic flaw detection unit consists of an ultrasonic probe, a water storage cavity, a magnetic fluid storage cavity, a water circulation pipeline, a magnetic fluid circulation pipeline, a magnetic induction coil, a water pump and a magnetic fluid pump, and is clamped on the six-freedom-degree mechanical arm; the flaw detection is completed according to the space coordinate of a workpiece. The ultrasonic detection instrument and the detection method thereof can be used for performing flaw detection on the space complicated curve surface with the uneven surface; the flaw detection flexibility can be improved; the water resource waste is avoided; in addition, the water is controlled in a range inside the magnetic fluid storage cavity, so that the corrosion on the surfaces of metal elements by water and the humid damage to important electronic elements in the conventional detection process can be avoided.

Description

technical field [0001] The invention relates to a water immersion type ultrasonic detector, in particular to a magnetic fluid sealed partial water immersion type ultrasonic detector capable of spatial scanning and a detection method thereof. Background technique [0002] Ultrasonic testing can be divided into contact method, electromagnetic coupling method, and liquid immersion method according to the different contact methods between the probe and the specimen. Among them, the contact method requires the ultrasonic probe to be in direct contact with the workpiece, and the probe is prone to wear and tear; since the coil is increased by one winding wavelength from the surface of the workpiece, the amplitude of the acoustic signal will drop by 107dB and 96dB, which will cause large errors in the detection results. Therefore, the electromagnetic coupling method requires that the gap between the high-frequency coil and the workpiece should not be too large; the probe of the liqu...

AI Technical Summary

Problems solved by technology

The liquid spray type and the overflow type require water to be sprayed on the surface of the workpiece all the time, which will cause a great waste of water resources and also cause a certain degree of corrosion on the surface of the workpiece and flaw detection components

The water-through type can alleviate the waste of water resources to a certain extent, but for workpieces with uneven surfaces, the water-through type probes cannot be completely sealed with the surface of the workpiece, which will also cause a certain degree of waste of water resources, and it is not suitable for uneven surfaces. Ultrasonic testing of smooth and complex curved surfaces

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