Giant magnetostictive ultrasonic transducer

Abstract

The invention discloses a giant magnetostictive ultrasonic transducer which comprises a rear cover plate, a magnetism conduction block, a permanent magnet, a giant magnetostictive rod and an amplitudevariable rod, wherein the components are connected by using bolts; a pre-tightening force is provided by the bolts; a magnetism conduction sleeve, a magnetism conduction piece and the amplitude variable rod are fixed by using a screw and a stem; holes are formed in the middles of both the bolts and the amplitude variable rod; a groove is formed in the magnetism conduction piece; certain gaps areformed between a rear cover plate and the magnetism conduction sleeve, and between the giant magnetostictive telescopic rod and a coil. When a transducer is cooled by using a coolant, a hose is connected between the bolt and a central hole of the stem. By adopting the giant magnetostictive ultrasonic transducer, the transducer can be cooled by using a cooling gas or the coolant, a cooling water tube or a cooling water jacket can be also arranged between the coil and the giant magnetostictive telescopic rod to cool the transducer, the problem of heating of the transducer can be effectively solved while the transducer is rotated at a high speed, temperatures of the transducer can be controlled to fluctuate within a very small range, and the transducer can work stably.

Description

Technical field [0001] The invention belongs to the technical field of ultrasonic processing equipment, and specifically relates to a giant magnetostrictive ultrasonic transducer. Background technique [0002] At present, in the field of ultrasonic processing technology, piezoelectric ceramics are widely used as excitation materials for ultrasonic transducers. However, piezoelectric ceramics have relatively low power density, and have disadvantages such as overheating failure and fragility, which limit their use Applications in high-power applications. [0003] Giant magnetostrictive material is a new type of functional material with large magnetostriction coefficient; high power capacity; fast response speed; relatively stable performance; and large electromechanical coupling coefficient. It is beneficial to realize high-power and large-amplitude ultrasonic vibration. Due to the hysteresis effect and eddy current effect of the giant magnetostrictive material, and the excitation ...

AI Technical Summary

Problems solved by technology

Due to the hysteresis effect and eddy current effect of the giant magnetostrictive material, and the excitation coil must work at high frequency, a large amount of heat will be generated, which seriously affects the performance of the giant magnetostrictive transducer

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