Device and method for detecting airtightness of bottle cap based on sound signal processing

A technology for sound signal processing and tightness detection. It is applied in the use of liquid/vacuum for liquid tightness measurement, and by detecting the appearance of fluid at the leak point, which can solve problems such as small occupied space and achieve excellent detection results.

Inactive Publication Date: 2010-12-29
SHANDONG UNIV
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The device occupies a small space and can accurately judge s...

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  • Device and method for detecting airtightness of bottle cap based on sound signal processing
  • Device and method for detecting airtightness of bottle cap based on sound signal processing
  • Device and method for detecting airtightness of bottle cap based on sound signal processing

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Embodiment Construction

[0047] The present invention will be described in further detail below in conjunction with accompanying drawing:

[0048] For the seal tightness detection, when the detection is started, the electromagnetic pulse impacts the surface of the bottle cap to vibrate it, and the acoustic sensor, that is, the microphone, receives the acoustic reflection signal from the bottle cap. The acoustic signal depends on the tension of the cap, which depends on the pressure inside the bottle, which depends on the tightness of the beer bottle. Based on this, we can judge whether the seal of the bottle cap is qualified by analyzing the frequency or energy of the reflected signal.

[0049] Such as figure 1As shown, the present invention includes the following components: the generation of the sound signal, the extraction of the sound signal and the analysis and processing of the sound signal. The generation of the acoustic signal is generated by the vibration of the bottle cap by the electromag...

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Abstract

The invention discloses a device and a method for detecting the airtightness of a bottle cap based on sound signal processing. The method comprises three parts, namely generation, extraction and analytical processing of a sound signal, wherein an electromagnetic excitation device excites the bottle cap to generate the sound signal and consists of an electromagnet and a control circuit; and the extraction of the sound signal is realized by a sound sensor, namely a microphone. A digital signal processing (DSP) circuit comprises a sound pickup module, a signal amplification module, an analog filtering module, a signal threshold value detection module, a voltage conversion module and the like. The device and the method have good detection effect; and the detection accuracy rate of a product in experiments reaches 99 percent.

Description

technical field [0001] The present invention relates to a bottle cap airtightness detection device and method based on sound signal processing. Specifically, the present invention relates to detecting bottle caps using the theory of sound signal processing after the cap is sealed on a beverage filling production line such as wine. Whether the sealing performance is qualified or not, the applicable object is the crown bottle cap made of tinplate material. Background technique [0002] The sealing test after capping is required on the beverage filling production line such as alcoholic beverages. At present, the market of cap sealing test on the filling production line is basically monopolized by German and American companies, and the price is expensive. It is of great significance to develop a cap sealing test equipment with independent intellectual property rights, which can not only meet the urgent needs of domestic alcohol and other beverage manufacturers for this equipmen...

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Application Information

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IPC IPC(8): G01M3/24
Inventor 马思乐李现明王海相刘海法王会泉李璐
Owner SHANDONG UNIV
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