| Ultrasonic suspension technology is currently a key technology to realize containerless processing of materials,mainly used to analyze tiny samples or droplets,processing of containerless materials,ground and space experiments,etc.Based on the characteristics of the ultrasonic levitation technology,this paper focuses on the mechanical structure design of the ultrasonic levitation 3D printing device and the suspension stability of the particles.It is proposed to use the power ultrasonic technology as the theoretical basis to carry out the structural design and theoretical calculation of the structural unit of the ultrasonic levitation3 D printing device.,And verified the feasibility of the 3D printing mechanical structure application of the ultrasonic suspension system through finite element simulation analysis.First of all,this article briefly describes the characteristics of ultrasonic levitation and the characteristics of ultrasonic and the impact of ultrasonic on 3D printing,selects the appropriate levitation technology as the research object,and designs and analyzes the overall structure of the ultrasonic levitation technology 3D printing device.The mechanical structure of the suspension system is designed with reference to the relevant structure of the ultrasonic suspension system.Combining the layout of the transducer in space,design various parts of the mechanical structure,including longitudinal columns,transverse columns,top brackets,support mechanisms,transmission mechanisms,fixing mechanisms,printing work planes,support mechanisms and driving devices.Then the basic theory of the transducer is explained,and the theoretical design and detailed parameter calculation of the piezoelectric transducer are completed.At the same time,the structural size of the horn is calculated.Secondly,the related theories of piezoelectric transducers,piezoelectric materials and their performance parameters,and vibration modes are introduced in detail.According to the one-dimensional longitudinal vibration theory,the sandwich piezoelectric transducer is designed and calculated.Starting from the equivalent mass method of thin-walled rods,the cylindrical radiating head structure is designed and the relevant dimensional parameters are determined.Finally,the modal analysis,harmonic response analysis and transient dynamics analysis of the piezoelectric transducer are carried out using simulation software to obtain the resonance frequency structure of the longitudinal vibration mode and the end-face output amplitude results.At the same time,based on the basic theoretical analysis of acoustic levitation and meeting the basic requirements of acoustic levitation force,combined with the relevant parameters of the selected suspended sample,the suspension characteristics of different samples can be obtained.Under the requirements of the suspension foundation,the mechanical structure related parts of the ultrasonic suspension system are statically analyzed.Through the optimization analysis of the radiating surface of the acoustic levitation system structure,the radiating surface with the best suspension performance is selected and the acoustic simulation analysis is performed under the conditions of different suspended samples,and the suspension performance of the designed structure is verified through the analysis results.Combined with the above simulation analysis,this paper also built an ultrasonic levitation experimental system platform,completed the selection of experimental equipment,and laid a foundation for verifying the feasibility of the ultrasonic levitation 3D printing device design scheme. |
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