High-stability supersonic transducer and its making process

Abstract

The high-stability supersonic transducer has piezoelectric ceramic chip and electrode sheet set between the front and the back vibrating blocks, double-headed screw bolts to connect the front and the back vibrating blocks, front vibration stabilizing slot on the front vibrating block, back vibration stabilizing slot on the back vibrating block and waterproof protecting layer around the piezoelectric ceramic chip. The making process includes the conventional heat treatment of the front vibrating block, the back vibrating block and the double-headed screw bolts; conventional assembling and final painting of waterproof protecting layer around the piezoelectric ceramic chip and the electrode sheet.

Description

technical field [0001] The invention belongs to the technical field of methods or equipment for the generation or transmission of subsonic, audible or ultrasonic mechanical vibrations used in general mechanical operations, and specifically relates to the generation or transmission of subsonic, audible or ultrasonic vibrations using subelectric effects or electrostrictive work. Method or apparatus for frequency mechanical vibration. Background technique [0002] At present, the existing ultrasonic transducer is to connect the front vibrating block and the rear vibrating block with a single head ordinary threaded bolt, and a piezoelectric ceramic sheet and an electrode are installed between the front vibrating block and the rear vibrating block. Single-head ordinary threaded bolts, the bolts have a large pitch, low tensile strength, and small fastening force, resulting in uneven stress on the piezoelectric ceramic sheet, affecting the overall rigidity of the transducer, causin...

AI Technical Summary

Problems solved by technology

Single-head ordinary threaded bolts, the bolts have a large pitch, low tensile strength, and small fastening force, resulting in uneven stress on the piezoelectric ceramic sheet, affecting the overall rigidity of the transducer, causing vibration waves to reflect each other on multiple interfaces, and poor concentricity

[0003] The front vibration block and the rear vibration block of the above-mentioned ultrasonic transducer are not processed or made with vibration stabilization grooves, so that the front vibration block and the rear vibration block are pulled up when the ultrasonic transducer is prestressed, and the front vibration block and the rear vibration block are pulled up. The center and the edge are uneven, which makes the piezoelectric ceramic sheet uneven, and the interface air layer appears, which increases the vibration attenuation. At the same time, the ultrasonic transducer is easy to damage the piezoelectric ceramic sheet when it is working at a large amplitude.

[0004] There is no moisture-proof protective layer installed around the piezoelectric ceramic sheet of the above-mentioned ultrasonic transducer, and moisture in water and air can easily enter the piezoelectric ceramic sheet of the ultrasonic transducer, which reduces the dielectric strength of the piezoelectric ceramic sheet of the ultrasonic transducer , cause a short circuit, power drop, so that it cannot work normally

[0005] The traditional process of ultrasonic transducers is that the front vibrating block, the rear vibrating block and the single-head bolts are directly assembled and used without heat treatment after machining. This manufacturing process makes the hardness of the above-mentioned parts low and the internal microstructure distribution is uneven. Even, the internal friction of the transducer is very high, and at the same time, it affects the increase of the attenuation coefficient of sound wave propagation, and the processing flatness of the end faces of the front vibration block and the rear vibration block. The bolt strength is low and cannot withstand large prestress. lower overall stiffness

[0006] Due to the above reasons, when the transducer is running at high power and for a long time, the internal friction and heat generation are relatively large, which affects the changes of other parameters, the frequency drift is large, the power is reduced, and the stability is deteriorated.

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