How to judge the quality of the ultrasonic cleaning transducer vibrator?
Publish Time: 2019-05-13 Origin: Site
Judging whether the ultrasonic cleaning transducer is good or not can be done from the following points:
When installing the ultrasonic cleaning transducer a crack occurs in the wafer when the ultrasonic vibrator is mounted.piezoelectric ceramics themselves, such as internal delamination;There is a problem with the design and assembly of the horn and the mold;The parts around the stress rod caused by the difference in the concentricity collide.
1, mechanical resonance frequency
3. Mechanical quality factor is determined by the conductance curve method, Qm=Fs /(F2-F1), the higher the Qm is the better, because the higher Qm has the higher the vibrator efficiency; but the Qm must match the power supply, the Qm value is too high The power supply does not match. For cleaning vibration ,For example, the higher the Qm value is the better. Generally speaking, the Qm of the cleaning vibrator should reach 500-1000. If it is too low, the vibrator efficiency is low. If it is too high, the power supply cannot be matched. For ultrasonic welding or machining, the Qm value of the ultrasonic bath transducers itself.Generally, it is around 50-1000, and the whole system is 1500-3000. If it is too low, the vibration efficiency is low, but it can't be too high. Because the higher is the Qm, the narrower is the working bandwidth, the power supply is difficult to match, that is, the power supply is difficult to work in resonance. frequency point,The device is not working.
4, the capacitance value of the piezoelectric device at 1kHz frequency, this value is consistent with the value measured by the digital capacitance meter. This value subtracts the dynamic capacitor C1 to get the true static capacitance C0, C0 = CT-C1. Use inductive balance C0. In the circuit design process or an ultrasonic washing machine, the correct balance C0 can improve the power factor of the power supply, there are two methods using the balance inductance, parallel tuned and series tuned.
5.Anti-resonance frequency, the resonant frequency of the parallel branch of the piezoelectric vibrator. At this frequency, the impedance Zmax of the piezoelectric vibrator is the largest. If the anti-resonant impedance Zmax is low, the vibrator has a problem.