Magnetostrictive transducer used for sound wave nondestructive examination

Abstract

The invention relates to a magnetostrictive transducer used for sound wave nondestructive examination which belongs to the technical filed of magnetism-sound mechanical transmission and sound wave nondestructive examination. The transducer comprises a casing, epoxy resin, an electromagnetic driving coil, magnetostrictive material, output connection rod, a preloaded spring, a preloaded locknut, anO-ring seal, integrated vibration output block pedestal and vibration output block front end, a transducer waterproof trigger switch and a waterproof power supply cassette. The magnetostrictive transducer has unidirectional output characteristic and can improve the output vibration amplitude and output energy of the transducer. The magnetostrictive transducer uses resin encapsulation to protect key material, thereby improving the shock resistance and breaking resistant performance of the magnetostrictive material. The transducer has waterproof and moistureproof capability and low cost, is easy for manufacturing and maintaining, can be applied to the sound wave nondestructive examination field of foundation pile, roof bolt, bridge, building, concrete structural component and the like and can be fit for field working environment.

Description

technical field [0001] The invention belongs to the technical field of magneto-acoustic mechanical conversion and acoustic nondestructive testing, and in particular provides a magnetostrictive transducer for acoustic nondestructive testing. It is suitable for acoustic non-destructive testing of foundation piles, anchor rods, bridges, buildings, concrete structures, etc. Background technique [0002] The Tb-Dy-Fe series giant magnetostrictive materials developed in the 1960s and 1970s, and the Fe-Ga series and Fe-Ga-Al series magnetostrictive materials discovered in recent years can produce magnetostrictive strain under the action of an external magnetic field. It is an important electromechanical conversion material for driving devices and acoustic transducer devices. Another class of strained materials is piezoelectric ceramic materials, which can produce electrostriction and force output phenomena under the action of an external electric field, and are also important elec...

AI Technical Summary

Problems solved by technology

Accurate control or measurement of the pre-tight force cannot be achieved in the pre-tight force adjustment, so the pre-tight force applied to the magnetostrictive material cannot be completely determined, resulting in uncertainty in the output performance of the material. The consistency of the energy generator or vibration system cannot be guaranteed

In addition, as an industrial vibration source, the transducer has no special requirements for waterproofing, so there is no waterproof sealing structure in the structure

The rare earth giant magnetostrictive material used as the driving source is a brittle intermetallic compound. The material’s flexural strength is less than 25MPa, and it is easily broken under long-term vibration or impact conditions, resulting in damage to the transducer.

In the structure of the invention there is also no protection mechanism for the material

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