The transducer of the small ultrasonic cleaning machine mainly consists of: the housing matching layer, that is, the sound window, the piezoelectric ceramic disc transducer, the backing, and the lead-out cable. It is characterized in that it also includes an array receiver, which is composed of the lead-out cable, 8 to 16 transducers, a metal ring, and a rubber gasket. The array receiver is located above the disc-type piezoelectric transducer 3. The piezoelectric ceramic disc transducer is used as the basic transducer for ultrasonic cleaning machines, which emits and receives ultrasonic cleaning machine signals. The array receiver is located above the disc-type piezoelectric transducer and serves as the receiver of the ultrasonic cleaning machine, used to receive Doppler echo signals outside the frequency band of the disc-type transducer. Advantages of the small ultrasonic cleaning instrument: (1). The small ultrasonic cleaner adopts high-precision technology: As the energy of the small ultrasonic cleaner can penetrate tiny crevices and small holes, it can be applied to the cleaning of any parts or assemblies. When the parts to be cleaned are precision components or assemblies, small ultrasonic cleaning machines often become the only cleaning method that can meet their special technical requirements. (2). The small ultrasonic cleaning instrument has a rapid cleaning effect: Ultrasonic cleaning is much faster than conventional cleaning methods in removing dust and scale from workpieces. The assembly can be cleaned without assembly. The labor-saving advantage of ultrasonic cleaning often makes it the most economical cleaning method. (3). The cleaning effect of the small ultrasonic cleaning instrument remains consistent: Regardless of whether the items to be cleaned are large or small, simple or complex, single or in batches, or on an automatic assembly line, ultrasonic cleaning can achieve a uniform level of cleanliness that manual cleaning cannot compare with.