Sensor and test device for testing tone key of musical box

Abstract

A sensor for testing keys of a music box comprises a housing, a vibration detecting coil, a coil rack, an actuating coil, a wire, and an iron core with flat head section, wherein the coil rack is arranged at the middle of the housing; the iron core is inserted in the center of the coil rack; the vibration detecting coil and the actuating coil are respectively wound on the upper and the lower parts of the coil rack; the vibration detection coil is connected with a signal processing circuit; and the actuating coil is connected with a power line. The invention also provides a music box key testing device including the sensor. The sensor has the advantages that the sensor is integrated with vibration excitation and test and can be used for providing the vibration source and testing with high test accuracy and good stability. The sensor and the testing device can achieve vibration excitation and test of keys in one work position to obviate the respective arrangement of vibration excitation positions and test positions in the prior art, thus reducing the number of work positions, reducing the size of the testing device, improving the work efficiency and prolonging the service life.

Description

technical field [0001] The invention relates to a tuning and testing device for an octave soundboard, in particular to a sensor therein. Background technique [0002] The traditional tuning (tuning) method is to let the keys (or sound teeth) corresponding to each scale on the vibrating plate be plucked one by one to generate vibrations, so that they can be pronounced, and the corresponding standard frequency of each scale is plucked. Oscillation is input into one axis of the oscilloscope as a synchronous signal, and the electrical signal converted from the vibration of the sound tooth is added to the other axis of the oscilloscope, and then the deviation of the natural frequency of the sound tooth is observed according to the flow of the signal on the oscilloscope picture tube, and the result is judged Finally, grind the thickness of the sound tooth or the weight part of the front end to correct the natural frequency. [0003] In this traditional tuning method, the sensor t...

AI Technical Summary

Problems solved by technology

[0005] But when testing the keys of the soundboard, this method and equipment still need to vibrate the keys manually or with other tools, and the keys can be tested after they vibrate, which not only brings vibration errors, but also requires multiple stations to realize the vibration and test functions, so the equipment is larger and the production efficiency is lower

[0006] In addition, the sensor is in the electrolyte spray environment during the test, so ordinary sensors cannot be used

Images