The tuning fork level switch performs vibration drive through the piezoelectric crystal on the tuning fork dielectric film, so that the tuning fork works at a certain resonant frequency. Usually, this resonance frequency point is the resonance point of the two-wing vibration of the tuning fork, and it is the embodiment of the fork-wing vibration balance. The fork-wing vibration cancel each other out, so that the vibration energy will not be transmitted to the process connection, ensuring high sensitivity and high reliability of the vibration probe. For this reason, the two forks of the tuning fork must be exactly the same in shape, size and mass distribution in order to ensure stable and reliable product operation. With the development of modern technology, the capability of domestic machining has also been improved unprecedentedly. The dimensional accuracy of tuning fork bifurcating wings can easily reach within five wires. The following table lists the small changes in the length, thickness and mass of the fork. Frequency impact data. (Table 1: Changing the length of the fork, the magnitude of its vibration frequency changes) (Table II: Change the thickness of the fork and change the vibration frequency) The relationship between frequency and quality: It can be concluded that when the mass of the fork wing changes by 0.4g, the vibration frequency of the fork body changes by about 1Hz, as shown in Table 3: (Table 3: The mass of the fork changes, the magnitude of its vibration frequency changes) It can be seen from the above calculation results that the quality change of the vibrating fork is more significant than the dimensional tolerance of the part. Therefore, the correct material is selected to improve the machining accuracy of the fork wing, so that the mass distribution of the fork wing is consistent, so that the vibration of the two-blade wing can reach the most appropriate resonance state, and the tuning-fork level switch can be made reliable and sensitive. (Calculated as R&D Department)
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Why does the vibration probe require high machining accuracy?