CN115655597A - Air tightness detection system and method for microphone - Google Patents
Air tightness detection system and method for microphone Download PDFInfo
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- CN115655597A CN115655597A CN202211594311.6A CN202211594311A CN115655597A CN 115655597 A CN115655597 A CN 115655597A CN 202211594311 A CN202211594311 A CN 202211594311A CN 115655597 A CN115655597 A CN 115655597A
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Abstract
The invention relates to the technical field of microphone airtightness detection, in particular to a system and a method for detecting the airtightness of a microphone. A system for detecting the air tightness of a microphone comprises an air tightness detecting component, a gas cavity and a gas detection component, wherein the gas cavity is provided with a first cavity opening and a second cavity opening; the electromagnetic valve is connected with the second cavity through a first air pipe; the air pump is connected with the electromagnetic valve through a second air pipe; the inflation pump is connected with the electromagnetic valve through a third air pipe; the air pressure detector is arranged in the gas cavity and used for acquiring air pressure data in the gas cavity in real time; the air pressure display equipment is electrically connected with the air pressure detector and is used for displaying air pressure data in the air cavity in real time; and the control module is electrically connected with the electromagnetic valve, the air pump, the inflator pump and the air pressure detector. The system and the method for detecting the air tightness of the microphone have the advantages of low air tightness detection cost and high accuracy of an air tightness detection result.
Description
Technical Field
The invention relates to the technical field of microphone airtightness detection, in particular to a system and a method for detecting the airtightness of a microphone.
Background
A microphone, also called a microphone or a microphone, is an energy conversion device that converts a sound signal into an electrical signal. When the microphone has the conditions of solder leakage, cold solder joint and the like in the production process, the air tightness of the microphone is deteriorated.
In the prior art, a microphone to be detected is fixed on a product fixing seat of the air tightness detection device, the microphone is electrically connected and conducted with a test module arranged on the product fixing seat, the microphone starts to sound under the control of the test module after being conducted, at the moment, a sound source receiver can receive a sound source sent by the microphone and feeds the sound source signal back to a control box, and the control box automatically identifies the sound source signal after the sound source signal is received, so that whether the air tightness of the microphone is good or not is judged.
In the existing microphone airtightness detection mode, on one hand, the adopted airtightness detection device has a complex structure and high cost, so that the airtightness detection cost of the microphone is high; on the other hand, whether the air tightness of the corresponding microphone is qualified or not is judged by automatically identifying the collected sound source signals, but the identification difficulty of the sound source signals is high, errors are easy to occur, and the accuracy of the air tightness detection result is not high.
Disclosure of Invention
The invention provides a system and a method for detecting the air tightness of a microphone aiming at the problems in the prior art, the air tightness detection cost is low, and the accuracy of an air tightness detection result is high.
The technical scheme adopted by the invention for solving the technical problem is as follows: a system for detecting the airtightness of a microphone comprises
The gas tightness detection part is provided with a gas cavity, the gas cavity is provided with a first cavity opening and a second cavity opening, and the first cavity opening is used for connecting a microphone to be detected;
the electromagnetic valve is connected with the second cavity through a first air pipe;
the air pump is connected with the electromagnetic valve through a second air pipe;
the inflation pump is connected with the electromagnetic valve through a third air pipe;
the air pressure detector is arranged in the gas cavity and used for acquiring air pressure data in the gas cavity in real time;
the air pressure display equipment is electrically connected with the air pressure detector and is used for displaying air pressure data in the air cavity in real time;
a control module electrically connected with the electromagnetic valve, the air pump, the inflator pump and the air pressure detector, and the control module comprises
The first air pressure value acquisition unit is used for waiting for the closing of the electromagnetic valve and acquiring a first air pressure value of the air cavity when the air pressure in the air cavity reaches a preset air pressure value;
the timing unit is used for starting timing when the first air pressure value acquisition unit acquires the first air pressure value;
the second air pressure value acquisition unit is used for acquiring a second air pressure value of the air cavity at a corresponding moment when the timing unit reaches a preset timing value;
the air pressure value processing unit is used for subtracting the first air pressure value from the second air pressure value to obtain an air pressure change value;
the air tightness judging unit is used for comparing the air pressure change value with the air pressure change threshold value, and judging that the air tightness of the corresponding microphone is unqualified when the air pressure change value is greater than or equal to the air pressure change threshold value; and when the air pressure change value is smaller than the air pressure change threshold value, judging that the air tightness of the corresponding microphone is qualified.
Preferably, the air pressure value acquisition unit comprises
The first air pressure data acquisition subunit is used for acquiring air pressure data when the electromagnetic valve is closed;
the first air pressure data analysis subunit is used for comparing the current air pressure data with the previous air pressure data and judging that the air pressure data has fluctuation when the difference value of the current air pressure data and the previous air pressure data is greater than or equal to an air pressure fluctuation threshold value; when the difference value of the current air pressure data and the previous air pressure data is smaller than an air pressure fluctuation threshold value, judging that the air pressure data has no fluctuation;
the first counting subunit is used for setting the counting value of the first air pressure data analysis subunit as one when the current judgment result is that the data is not fluctuated and the last judgment result is that the data is fluctuated; when the current judgment result of the first air pressure data analysis subunit is data fluctuation-free and the last judgment result is data fluctuation-free, the counting value is increased by one;
the first counting value judgment subunit is used for comparing the counting value of the first counting subunit with a first preset counting threshold value, and when the counting value of the first counting subunit is equal to the first preset counting threshold value, judging that the air pressure is stable;
and the first air pressure value acquisition subunit is used for acquiring the first air pressure value of the air cavity at the corresponding moment when the first counting value judgment subunit judges that the air pressure is stable.
Preferably, the airtightness detection system further comprises
The sealing plug is in the same shape as the microphone to be detected and is detachably connected with the first cavity opening of the air tightness detection part;
the control module further comprises
The first air pressure value acquisition unit is used for waiting for the electromagnetic valve to be closed and acquiring a first air pressure value of the gas cavity when the air pressure in the gas cavity reaches a preset air pressure value;
the second air pressure value acquisition unit is used for acquiring a second air pressure value of the gas cavity at a corresponding moment when the timing unit reaches a preset timing value;
and the fixed air pressure change value determining unit is used for subtracting the first air pressure value from the second air pressure value to obtain a fixed air pressure change value.
Preferably, the first air pressure value acquiring unit includes
The first air pressure data acquisition subunit is used for acquiring air pressure data when the electromagnetic valve is closed;
the first air pressure data analysis subunit is used for comparing the current air pressure data with the previous air pressure data and judging that the air pressure data has fluctuation when the difference value of the current air pressure data and the previous air pressure data is greater than or equal to an air pressure fluctuation threshold value; when the difference value of the current air pressure data and the previous air pressure data is smaller than an air pressure fluctuation threshold value, judging that the air pressure data has no fluctuation;
the first counting subunit is used for setting the counting value to be one when the current judgment result of the first air pressure data analysis subunit is that the data has no fluctuation and the last judgment result of the first air pressure data analysis subunit is that the data has fluctuation; when the current judgment result of the first air pressure data analysis subunit is data non-fluctuation and the last judgment result of the first air pressure data analysis subunit is data non-fluctuation, the counting value of the first air pressure data analysis subunit is increased by one;
the first counting value judging subunit is used for comparing the counting value of the first counting subunit with a first preset counting threshold value, and judging that the air pressure is stable when the counting value of the first counting subunit is equal to the first preset counting threshold value;
and the first air pressure value acquisition subunit is used for acquiring the first air pressure value of the air cavity at the corresponding moment when the first counting value judgment subunit judges that the air pressure is stable.
Preferably, the airtightness determination unit includes
A first air pressure change threshold setting subunit, configured to set a first air pressure change threshold according to the air pressure change threshold; when the air pressure change value is smaller than or equal to the first air pressure change threshold value, the air tightness judging unit judges that the air tightness of the corresponding microphone is finally qualified;
a second air pressure change threshold value setting subunit, configured to set a second air pressure change threshold value according to the air pressure change threshold value; when the air pressure change value is larger than or equal to a second air pressure change threshold value, the air tightness judging unit judges that the air tightness of the corresponding microphone is finally unqualified; and when the air pressure change value is greater than the first air pressure change threshold and less than the second air pressure change threshold, the air tightness judging unit judges that the corresponding microphone needs to detect the air tightness again.
The air tightness detection method of the microphone by adopting the air tightness detection system comprises the following steps
L1, connecting a microphone to be detected with a first cavity opening of the air tightness detection part;
l2, the control module sequentially opens the electromagnetic valve and the air extracting pump, and the air extracting pump extracts air until the air pressure in the air cavity reaches a preset air pressure value; the control module closes the electromagnetic valve and the air extracting pump in sequence, and the first air pressure value acquisition unit acquires a first air pressure value of the air cavity;
l3, the timing unit starts to count when the first air pressure value acquisition unit acquires the first air pressure value, and when the timing unit reaches a preset timing value, the second air pressure value acquisition unit acquires a second air pressure value of the air cavity;
l4, subtracting the first air pressure value from the second air pressure value by the air pressure value processing unit to obtain an air pressure change value; the air tightness judging unit compares the air pressure change value with an air pressure change threshold, and judges that the air tightness of the corresponding microphone is unqualified when the air pressure change value is greater than or equal to the air pressure change threshold; when the air pressure change value is smaller than the air pressure change threshold value, the air tightness of the corresponding microphone is judged to be qualified;
l5, after the air tightness judging unit obtains an air tightness judging result, the control module sequentially opens the electromagnetic valve and the inflator pump, and the inflator pump inflates until the air pressure in the air cavity reaches the standard atmospheric pressure; the control module closes the electromagnetic valve and the inflator pump in sequence;
and L6, removing the microphone to be detected from the air tightness detection part.
Preferably, said L2 specifically comprises
L21, when the electromagnetic valve is closed, the first air pressure data acquisition subunit acquires air pressure data;
l22, acquiring one air pressure data from the air pressure data according to the data acquisition sequence as the current air pressure data;
l23, comparing the current air pressure data with the previous air pressure data by the first air pressure data analysis subunit, judging that the air pressure data has fluctuation when the difference value of the current air pressure data and the previous air pressure data is greater than or equal to an air pressure fluctuation threshold value, and returning to L22; when the difference value of the current air pressure data and the previous air pressure data is smaller than an air pressure fluctuation threshold value, judging that the air pressure data has no fluctuation, and entering L24;
l24, when the last judgment result of the first air pressure data analysis subunit is that the data has fluctuation, the first counting subunit sets the counting value thereof as one and returns to L22; when the last judgment result of the first air pressure data analysis subunit is that the data is not fluctuated, the first counting subunit adds one to the counting value of the first air pressure data analysis subunit, and the process enters L25;
l25, comparing the count value of the first counting subunit with a first preset counting threshold value, when the count value of the first counting subunit is equal to the first preset counting threshold value, judging that the air pressure is stable, and entering L26; otherwise, returning to L22;
and L26, the first air pressure value acquiring subunit acquires a first air pressure value of the air cavity at the corresponding moment.
Preferably, the method further comprises the following steps before the step L1
L01, connecting the sealing plug with a first cavity opening of the air tightness detection part;
l02, the control module sequentially opens the electromagnetic valve and the air pump, and the air pump pumps air until the air pressure in the air cavity reaches a preset air pressure value; the control module sequentially closes the electromagnetic valve and the air suction pump, and the first air pressure value acquisition unit acquires a first air pressure value of the air cavity;
l03, the timing unit starts to count when the first air pressure value acquisition unit acquires the first air pressure value, and when the timing unit reaches a preset timing value, the second air pressure value acquisition unit acquires a second air pressure value of the gas cavity;
l04, subtracting the first air pressure value from the second air pressure value by a fixed air pressure change value determination unit to obtain a fixed air pressure change value, wherein the fixed air pressure change value is used for determining an auxiliary air pressure change threshold value;
l05, after the fixed air pressure change value is obtained, the control module sequentially opens the electromagnetic valve and the inflator pump, and the inflator pump inflates until the air pressure in the air cavity reaches the standard atmospheric pressure; the control module closes the electromagnetic valve and the inflator pump in sequence;
and L06, removing the sealing plug from the air tightness detection part.
Preferably, L02 specifically comprises
L021, when the electromagnetic valve is closed, the first air pressure data acquisition subunit acquires air pressure data;
l022, acquiring air pressure data from the air pressure data according to the data acquisition sequence to serve as current air pressure data;
l023, comparing the current air pressure data with the previous air pressure data by the first air pressure data analysis subunit, judging that the air pressure data has fluctuation when the difference value of the current air pressure data and the previous air pressure data is more than or equal to an air pressure fluctuation threshold value, and returning to L022; when the difference value of the current air pressure data and the previous air pressure data is smaller than an air pressure fluctuation threshold value, judging that the air pressure data has no fluctuation, and entering L024;
l024, when the last judgment result of the first air pressure data analysis subunit is that the data has fluctuation, the first counting subunit sets the counting value thereof as one and returns to L022; when the last judgment result of the first air pressure data analysis subunit is that the data has no fluctuation, the first counting subunit adds one to the counting value and enters L025;
l025, comparing the count value of the first counting subunit with a first preset counting threshold by the first count value determining subunit, determining that the air pressure is stable when the count value of the first counting subunit is equal to the first preset counting threshold, and entering L026; otherwise, returning to L022;
l026. The first gas pressure value acquiring subunit acquires a first gas pressure value of the gas chamber at a corresponding time.
Preferably, the method further comprises the step of adding a new compound before the step of L1
L00, setting a first air pressure change threshold value through a first air pressure change threshold value setting subunit, and setting a second air pressure change threshold value through a second air pressure change threshold value setting subunit;
the L4 also comprises that when the air pressure change value is less than or equal to a first air pressure change threshold value, the air tightness judging unit judges that the air tightness of the corresponding microphone is finally qualified; when the air pressure change value is larger than or equal to a second air pressure change threshold value, the air tightness judging unit judges that the air tightness of the corresponding microphone is finally unqualified; and when the air pressure change value is greater than the first air pressure change threshold and less than the second air pressure change threshold, the air tightness judging unit judges that the corresponding microphone needs to detect the air tightness again.
Advantageous effects
According to the air tightness detection system and method provided by the embodiment of the invention, on one hand, the air tightness detection of the microphone can be realized through the air tightness detection part, the electromagnetic valve, the air pump, the inflator pump, the air pressure detector, the air pressure display device and the control module, the structure of the whole air tightness detection system is very simple, so that the air tightness detection cost of the microphone is very low; on the other hand, the air tightness of the microphone is judged through the air pressure change of the air cavity, sound source signal identification is not needed, errors are not easy to occur, and the accuracy is higher;
according to the embodiment of the invention, after the electromagnetic valve is closed, the first air pressure data acquisition subunit, the first air pressure data analysis subunit, the first counting subunit and the first counting count value judgment subunit judge whether the air pressure of the air cavity is stable or not, and after the air pressure of the air cavity is stable, the first air pressure value acquisition subunit acquires the air pressure value of the air cavity at the corresponding moment as the first air pressure value;
according to the embodiment of the invention, when the air pressure change threshold is set, the fixed air pressure change value is also taken into account, so that the accuracy of the air tightness judgment result of the microphone is further improved.
Drawings
FIG. 1 is a schematic structural diagram of the connection between the air tightness detecting component and the microphone to be detected in the embodiment of the present invention;
FIG. 2 is a schematic view of embodiment 1 of a microphone airtightness detection system in accordance with an embodiment of the present invention;
FIG. 3 is a schematic view of embodiment 2 of the airtightness detection system for a microphone in the embodiment of the present invention;
fig. 4 is a schematic view of embodiment 3 of the air tightness detecting system of the microphone in the embodiment of the present invention.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
Example 1: the air tightness detection system of the microphone comprises an air tightness detection part 1, an electromagnetic valve, an air pump, an air pressure detector, air pressure display equipment and a control module.
The gas tightness detection member 1, as shown in fig. 1, has a gas chamber having a first port 1-1 and a second port 1-2, the first port 1-1 being for connection to a microphone to be detected. When the microphone is connected with the air tightness detection component 1, only the tail end of the microphone needs to be inserted into the first cavity opening 1-1. The gas tightness detection part 1 can be specifically made by metal material, and the gas tightness detection part 1 can include cube and cylinder that integrated into one piece formed, and the axial one end of cylinder is connected with the first side of cube, and the gas chamber has been seted up to the cube inside, and the first accent 1-1 in gas chamber extends and runs through to the axial other end of cylinder, and first accent 1-1 can be the round hole shape. The second orifice 1-2 of the gas cavity extends and penetrates to the second side face of the cube (the second side face is arranged opposite to the first side face), and the second orifice 1-2 can also be in a circular hole shape.
The electromagnetic valve is connected with the second cavity opening 1-2 through a first air pipe, the air pump is connected with the electromagnetic valve through a second air pipe, and the air pump is connected with the electromagnetic valve through a third air pipe. The air pressure detector is arranged in the air cavity and used for acquiring air pressure data in the air cavity in real time. The atmospheric pressure display device with atmospheric pressure detector electric connection is used for showing in real time the atmospheric pressure data of gaseous intracavity, staff's accessible atmospheric pressure display device looks over the real-time atmospheric pressure data of gaseous intracavity.
The control module is electrically connected with the electromagnetic valve, the air pump, the inflator pump and the air pressure detector, can automatically control the on and off of the electromagnetic valve, the air pump and the inflator pump, and can automatically acquire air pressure data detected by the air pressure detector.
During detection, a worker manually connects the microphone to be detected with the air tightness detection part 1, and presses a detection starting button on the control module after connection is completed. Then the control module controls the electromagnetic valve to open and controls the air pump to start, the air pump starts to pump out the air in the air cavity of the air tightness detection part 1, and the air pressure in the air cavity becomes lower and lower.
The control module comprises a first air pressure value acquisition unit, a timing unit, a second air pressure value acquisition unit, an air pressure value processing unit and an air tightness judgment unit.
The first air pressure value acquisition unit is used for acquiring a first air pressure value of the air cavity when the air pressure in the air cavity reaches a preset air pressure value. The air pressure detector can detect air pressure data in the air cavity in real time and send the corresponding air pressure data to the control module in real time, the control module can judge whether the air pressure in the air cavity reaches a preset air pressure value (for example, the preset air pressure value can be 75 KPa), and when the air pressure in the air cavity reaches the preset air pressure value, the control module can immediately control the electromagnetic valve to be closed and control the air pump to stop working. Then, the pressure value obtaining unit obtains a pressure value one of the gas chamber at the corresponding time (for example, the pressure value one is 72 KPa).
The timing unit is used for starting timing when the air pressure value acquisition unit acquires the air pressure value. After the first air pressure value acquisition unit finishes acquiring the first air pressure value, a feedback signal is sent to the control module, and the control module controls the timing unit to start timing after receiving the feedback signal.
The second air pressure value acquisition unit is used for acquiring a second air pressure value of the air cavity at a corresponding moment when the timing unit reaches a preset timing value. When the timing unit reaches a preset timing value (for example, 120 s), the timing unit sends a feedback signal to the control module, and the control module, after receiving the feedback signal, controls the second air pressure value obtaining unit to obtain a second air pressure value of the gas cavity at a corresponding time (for example, the second air pressure value may be 78 KPa, or the second air pressure value may be 84 KPa).
The air pressure value processing unit is used for subtracting the first air pressure value from the second air pressure value to obtain an air pressure change value. After the second air pressure value acquisition unit finishes acquiring the second air pressure value, a feedback signal is sent to the control module, and the control module controls the first air pressure value processing unit to process the first air pressure value and the second air pressure value after receiving the feedback signal, specifically, the first air pressure value is subtracted from the second air pressure value to obtain an air pressure change value. When the air pressure value is 78 KPa, the corresponding air pressure change value is 6KPa; when the second air pressure value is 84 KPa, the corresponding air pressure change value is 12KPa.
When the air pressure value processing unit obtains the air pressure change value, a feedback signal is sent to the control module, and the control module controls the air tightness judging unit to judge the air tightness of the microphone after receiving the feedback signal. Specifically, the air-tightness determining unit compares the air pressure change value with an air pressure change threshold (for example, the air pressure change threshold may be 10 KPa), and determines that the air-tightness of the corresponding microphone is not qualified when the air pressure change value is greater than or equal to the air pressure change threshold (for example, the air pressure change value is 12 KPa); when the air pressure variation value is smaller than the air pressure variation threshold value (for example, the air pressure variation value is 6 KPa), the air tightness of the corresponding microphone is judged to be qualified.
On one hand, the airtightness detection system of the embodiment can realize the airtightness detection of the microphone through the airtightness detection part 1, the electromagnetic valve, the air pump, the inflator pump, the air pressure detector, the air pressure display device and the control module, and the whole airtightness detection system has a very simple structure, so that the airtightness detection cost of the microphone is very low; on the other hand, the air tightness of the microphone is judged through the air pressure change of the air cavity, sound source signal identification is not needed, errors are not prone to occurring, and the accuracy is higher.
Further, when the solenoid valve is closed, the air pressure in the air chamber fluctuates, and if the air pressure value one is immediately acquired, the acquired air pressure value one may be inaccurate. Therefore, the first air pressure value acquiring unit is improved in the embodiment, and specifically, the first air pressure value acquiring unit includes a first air pressure data acquiring subunit, a first air pressure data analyzing subunit, a first counting value determining subunit and a first air pressure value acquiring subunit.
The first air pressure data acquisition subunit is used for acquiring air pressure data at a certain data acquisition frequency when the electromagnetic valve is closed. For example, the collected gas pressure data are 74.7kpa,73.8kpa,74.1kpa,74.3kpa,73.1kpa,72.6kpa,72.3kpa,72.1kpa,72.0kpa, 71.9kpa.
The first air pressure data analysis subunit is used for comparing the current air pressure data with the previous air pressure data, and when the difference value between the current air pressure data and the previous air pressure data is greater than or equal to an air pressure fluctuation threshold (for example, the air pressure fluctuation threshold may be 0.3), determining that the air pressure data has fluctuation; and when the difference value between the current air pressure data and the previous air pressure data is smaller than the air pressure fluctuation threshold value, judging that the air pressure data has no fluctuation.
For example, when the current air pressure data is 74.7KPa and there is no previous air pressure data (i.e., when the current air pressure data is the first air pressure data), it is determined that there is a fluctuation in the air pressure data. When the current air pressure data is 73.8KPa and the previous air pressure data is 74.7KPa, the difference between the two is 0.9 (greater than the air pressure fluctuation threshold value 0.3), the air pressure data is judged to have fluctuation. When the current air pressure data is 74.1KPa and the previous air pressure data is 73.8KPa, the difference between the two is 0.3 (equal to the air pressure fluctuation threshold value of 0.3), it is determined that the air pressure data has fluctuation. When the current air pressure data is 74.3KPa and the previous air pressure data is 74.1KPa, the difference between the two is 0.2 (less than the air pressure fluctuation threshold value 0.3), it is determined that the air pressure data is not fluctuated.
The first counting subunit is used for setting the counting value as one when the current judgment result of the first air pressure data analysis subunit is that the data is not fluctuated and the last judgment result of the first air pressure data analysis subunit is that the data is fluctuated; and when the current judgment result of the first air pressure data analysis subunit is data fluctuation-free and the last judgment result is data fluctuation-free, the counting value is increased by one.
For example, when the current air pressure data is 74.3KPa and the previous air pressure data is 74.1KPa, the determination result is that there is no fluctuation in the air pressure data, and the previous determination result is that there is fluctuation in the air pressure data, so the first counting subunit sets the count value thereof to one. When the current air pressure data is 73.1KPa and the previous air pressure data is 74.3KPa, the difference between the two is 1.2 (greater than the air pressure fluctuation threshold value 0.3), it is determined that the air pressure data has fluctuation. When the current air pressure data is 72.6KPa and the previous air pressure data is 73.1KPa, the difference between the two is 0.5 (greater than the air pressure fluctuation threshold value 0.3), it is determined that the air pressure data has fluctuation. When the current air pressure data is 72.3KPa and the previous air pressure data is 72.6KPa, the difference between the two is 0.3 (equal to the air pressure fluctuation threshold value of 0.3), the air pressure data is judged to have fluctuation. When the current air pressure data is 72.1KPa and the previous air pressure data is 72.3KPa, the difference between the two is 0.2 (less than the air pressure fluctuation threshold value 0.3), the air pressure data is judged to be not fluctuated, and the last judgment result is that the air pressure data is fluctuated, so the first counting subunit resets the counting value thereof to one. When the current air pressure data is 72.0KPa and the previous air pressure data is 72.1KPa, the difference value between the two is 0.1 (less than the air pressure fluctuation threshold value 0.3), the air pressure data is judged to be not fluctuated, and the last judgment result is that the air pressure data is not fluctuated, so that the counting subunit increases the counting value to 2. When the current air pressure data is 72.0KPa and the previous air pressure data is 72.0KPa, the difference value between the two is 0 (less than the air pressure fluctuation threshold value 0.3), the air pressure data is judged to be not fluctuated, and the last judgment result is that the air pressure data is not fluctuated, so that the counting subunit increases the counting value to 3.
The first count value determination subunit is configured to compare the count value of the first count subunit with a first preset count threshold (for example, the first preset count threshold may be 3), and determine that the air pressure is stable when the count value of the first count subunit is equal to the first preset count threshold.
For example, when the count value of the first counting subunit is 1, the count value is smaller than the first preset counting threshold, so that the next air pressure data is directly processed. When the count value of the first counting subunit is 2, the count value is smaller than the first preset counting threshold value, so that the next air pressure data is directly processed. When the count value of the first counting subunit is 3, the count value is equal to the first preset counting threshold value, so that the count value judging subunit judges that the air pressure is stable.
The first air pressure value obtaining subunit is used for obtaining the first air pressure value of the air cavity at the corresponding moment when the first counting value judging subunit judges that the air pressure is stable. When the count value judgment subunit judges that the air pressure is stable, the air pressure value one acquisition subunit takes the air pressure value of the air cavity at the corresponding moment as an air pressure value one (namely 72.0 KPa).
After the electromagnetic valve is closed, the first air pressure data acquisition subunit is used firstly, the first air pressure data analysis subunit is used for counting the first subunit, the counting value judges whether the air pressure of the first air cavity is stable or not, and after the air pressure of the air cavity is stable, the first air pressure value acquisition subunit acquires the air pressure value of the air cavity at the corresponding moment as the first air pressure value.
Example 2: the difference from embodiment 1 is that this embodiment further includes a sealing plug, and the control module further includes a first air pressure value obtaining unit, a second air pressure value obtaining unit, and a fixed air pressure change value determining unit. The first air pressure value obtaining unit is used for waiting for the electromagnetic valve to be closed and obtaining the first air pressure value of the air cavity when the air pressure in the air cavity reaches a preset air pressure value. The second air pressure value acquisition unit is used for acquiring a second air pressure value of the gas cavity at a corresponding moment when the timing unit reaches a preset timing value. The fixed air pressure change value determining unit is used for subtracting the first air pressure value from the second air pressure value to obtain a fixed air pressure change value.
In the air-tightness detection system, in addition to the occurrence of air leakage of the microphone to be detected, air leakage (i.e., air leakage existing in the air-tightness detection part 1 itself, which is referred to as inherent air leakage in the present embodiment) also occurs at the connection position of the microphone to the first chamber port 1-1 (i.e., their connection gap) and at the connection position of the first air tube to the second chamber port 1-2 (i.e., their connection gap). In order to improve the accuracy of the airtightness determination result, the present embodiment takes the inherent air leakage into consideration. In the embodiment, after the sealing plug is connected with the air tightness detecting part 1 instead of the microphone, because the sealing plug is air-tight, only the connection position of the sealing plug and the first cavity port 1-1 and the connection position of the first air pipe and the second cavity port 1-2 are left to have an air leakage phenomenon, and at this time, the inherent air leakage condition of the air tightness detecting part 1 can be detected.
Specifically, the shape of the sealing plug is the same as that of the microphone to be detected, and the sealing plug can be made of plastic materials, so that a gap formed after the sealing plug is connected with the first cavity opening 1-1 is almost the same as a gap formed after the microphone is connected with the first cavity opening 1-1. The sealing plug is detachably connected with the first cavity opening 1-1 of the air tightness detection part 1, and when the sealing plug is connected with the air tightness detection part 1, only the tail end of the sealing plug needs to be inserted into the first cavity opening 1-1. When the sealing plug is installed, the start test button on the control module is pressed. Then the control module controls the electromagnetic valve to open and controls the air pump to start, the air pump starts to pump out the air in the air cavity of the air tightness detection part 1, and the air pressure in the air cavity becomes lower and lower.
The air pressure detector can detect air pressure data in the air cavity in real time and send the corresponding air pressure data to the control module in real time, the control module can judge whether the air pressure in the air cavity reaches a preset air pressure value (for example, the preset air pressure value can be 75 KPa), and when the air pressure in the air cavity reaches the preset air pressure value, the control module can immediately control the electromagnetic valve to be closed and control the air pump to stop working. Then, the first pressure value obtaining unit obtains a first pressure value of the gas cavity at a corresponding time (for example, the first pressure value is 73 KPa). After the first air pressure value acquisition unit finishes acquiring the first air pressure value, a feedback signal is sent to the control module, and the control module controls the timing unit to start timing after receiving the feedback signal.
When the timing unit reaches a preset timing value (for example, 120 s), the timing unit sends a feedback signal to the control module, and the control module controls the second air pressure value obtaining unit to obtain the second air pressure value of the gas cavity at the corresponding time after receiving the feedback signal (for example, the second air pressure value may be 76 KPa). After the second air pressure value acquisition unit finishes acquiring the second air pressure value, a feedback signal is sent to the control module, and the control module controls the fixed air pressure change value determination unit to process the first air pressure value and the second air pressure value after receiving the feedback signal, specifically, the first air pressure value (73 KPa) is subtracted from the second air pressure value (76 KPa) to obtain a fixed air pressure change value (3 KPa). In the present embodiment, when the air pressure change threshold is set, the fixed air pressure change value is also taken into consideration, for example, when the original air pressure change threshold is 10KPa, the current air pressure change threshold is 13KPa, which is the sum of the original air pressure change threshold (10 KPa) and the fixed air pressure change value (3 KPa). In the present embodiment, when setting the air pressure variation threshold, the fixed air pressure variation value (i.e. the inherent air leakage condition of the air-tightness detecting component 1) is also taken into consideration, so as to further improve the accuracy of the air-tightness determination result of the microphone.
Further, the first air pressure value obtaining unit comprises a first air pressure data obtaining subunit, a first air pressure data analyzing subunit, a first counting value judging subunit and a first air pressure value obtaining subunit.
The first air pressure data acquisition subunit is used for acquiring air pressure data at a certain data acquisition frequency when the electromagnetic valve is closed. The first air pressure data analysis subunit is used for comparing the current air pressure data with the previous air pressure data, and judging that the air pressure data has fluctuation when the difference value of the current air pressure data and the previous air pressure data is greater than or equal to an air pressure fluctuation threshold value; and when the difference value between the current air pressure data and the previous air pressure data is smaller than the air pressure fluctuation threshold value, judging that the air pressure data has no fluctuation. The first counting subunit is used for setting the counting value to be one when the current judgment result of the first air pressure data analysis subunit is that the data is not fluctuated and the last judgment result of the first air pressure data analysis subunit is that the data is fluctuated; and when the current judgment result of the first air pressure data analysis subunit is data non-fluctuation and the last judgment result is data non-fluctuation, the counting value of the first air pressure data analysis subunit is increased by one. The first counting value judging subunit is used for comparing the counting value of the first counting subunit with a first preset counting threshold value, and when the counting value of the first counting subunit is equal to the first preset counting threshold value, the air pressure is judged to be stable. The first air pressure value obtaining subunit is used for obtaining the first air pressure value of the air cavity at the corresponding moment when the first counting value judging subunit judges that the air pressure is stable.
Similar to embodiment 1, this embodiment is after the solenoid valve is closed, first through first atmospheric pressure data acquisition subunit, first atmospheric pressure data analysis subunit, first count subunit, whether the atmospheric pressure of first count value judgement subunit judgement gas chamber is stable earlier, after the atmospheric pressure of gas chamber is stable, first atmospheric pressure value acquisition subunit reacquires the atmospheric pressure value of the gas chamber at corresponding moment as first atmospheric pressure value again, compare and directly acquire first atmospheric pressure value, the degree of accuracy that the first atmospheric pressure value that this embodiment obtained is higher, and then make the fixed atmospheric pressure change value that the calculation obtained more accurate.
Example 3: the difference from embodiment 2 is that the airtightness determination unit includes a first air pressure change threshold setting subunit and a second air pressure change threshold setting subunit.
The first air pressure change threshold setting subunit is used for setting a first air pressure change threshold according to the air pressure change threshold, and the second air pressure change threshold setting subunit is used for setting a second air pressure change threshold according to the air pressure change threshold. And when the air pressure change value is less than or equal to the first air pressure change threshold, the air tightness judging unit judges that the air tightness of the corresponding microphone is finally qualified. And when the air pressure change value is larger than or equal to the second air pressure change threshold value, the air tightness judging unit judges that the air tightness of the corresponding microphone is finally unqualified. And when the air pressure change value is greater than the first air pressure change threshold and less than the second air pressure change threshold, the air tightness judging unit judges that the corresponding microphone needs to detect the air tightness again.
After determining the good air pressure change threshold (for example, 13 KPa), the present embodiment further needs to set a first air pressure change threshold and a second air pressure change threshold according to the air pressure change threshold, for example, the first air pressure change threshold may be 12.5KPa, and the second air pressure change threshold may be 13.5KPa. When the air pressure variation value is less than or equal to 12.5KPa (for example, the air pressure variation value is 9 KPa), the actual air tightness of the microphone is qualified with high probability, so the air tightness judging unit judges that the air tightness of the corresponding microphone is qualified finally. When the air pressure variation value is equal to or greater than 13.5KPa (for example, the air pressure variation value is 18 KPa), it is indicated that the actual airtightness of the microphone is not good with a high probability, and therefore the airtightness determination means determines that the airtightness of the corresponding microphone is finally not good.
When the air pressure variation value is greater than 12.5KPa and less than 13.5KPa (for example, the air pressure variation value is 12.8KPa, or the air pressure variation value is 13.1 KPa), it indicates that the actual air tightness of the microphone is not very certain, and it is possible that the calculated air tightness is acceptable, but the actual air tightness is unacceptable; it is also possible that the calculated tightness is not acceptable, but in practice the tightness is acceptable. Therefore, it needs to be checked again.
When the second airtightness detection is performed, the preset timing value needs to be adjusted (for example, the preset timing value may be 240 s), and the air pressure change threshold is also adaptively adjusted accordingly. When the second judgment result corresponding to the microphone is the same as the first judgment result and the air tightness is qualified, judging that the air tightness judged by the corresponding microphone is finally qualified; and when the second judgment result of the corresponding microphone is the same as the first judgment result and the airtightness is not qualified, judging that the airtightness of the corresponding microphone is not qualified finally. When the second judgment result of the corresponding microphone is different from the first judgment result (namely, one is qualified and the other is unqualified), the airtightness detection can be performed again (the preset timing value and the air pressure change threshold value are also required to be adjusted), and the airtightness of the corresponding microphone is determined according to the third judgment result.
In the embodiment, when the first air tightness detection result of the corresponding microphone is uncertain, the second or third air tightness detection is carried out on the microphone again, and compared with direct one-time judgment, the accuracy of the final air tightness judgment result of the microphone is higher.
Example 4: a method for detecting the air tightness of a microphone by adopting the air tightness detecting system of the embodiment 2 comprises the following steps
L1. A microphone to be detected is connected to the first cavity opening 1-1 of the gas tightness detection part 1.
L2, the control module sequentially opens the electromagnetic valve and the air pump, and the air pump pumps air at a certain air pumping speed until the air pressure in the air cavity reaches a preset air pressure value; the control module closes the electromagnetic valve and the air extracting pump in sequence, and the first air pressure value acquiring unit acquires a first air pressure value of the air cavity.
When the electromagnetic valve is closed, the first air pressure data acquisition subunit acquires air pressure data at a certain data acquisition frequency. And L22, acquiring one air pressure data from the air pressure data according to the data acquisition sequence as the current air pressure data. L23, comparing the current air pressure data with the previous air pressure data by the first air pressure data analysis subunit, judging that the air pressure data has fluctuation when the difference value of the current air pressure data and the previous air pressure data is greater than or equal to an air pressure fluctuation threshold value, and returning to L22; and when the difference value of the current air pressure data and the previous air pressure data is smaller than the air pressure fluctuation threshold value, judging that the air pressure data has no fluctuation, and entering L24. L24, when the last judgment result of the first air pressure data analysis subunit is that the data has fluctuation, the first counting subunit sets the counting value thereof as one and returns to L22; when the last judgment result of the first barometric pressure data analysis subunit is that the data has no fluctuation, the first counting subunit adds one to the count value of the first barometric pressure data analysis subunit, and the process goes to L25. L25, comparing the count value of the first counting subunit with a first preset counting threshold value, when the count value of the first counting subunit is equal to the first preset counting threshold value, judging that the air pressure is stable, and entering L26; otherwise, return to L22. And L26, the first air pressure value acquiring subunit acquires a first air pressure value of the air cavity at the corresponding moment.
And L3, the timing unit starts to count when the first air pressure value acquisition unit acquires the first air pressure value, and when the timing unit reaches a preset timing value, the second air pressure value acquisition unit acquires a second air pressure value of the air cavity.
L4, subtracting the first air pressure value from the second air pressure value by the air pressure value processing unit to obtain an air pressure change value; the air tightness judging unit compares the air pressure change value with an air pressure change threshold, and judges that the air tightness of the corresponding microphone is unqualified when the air pressure change value is greater than or equal to the air pressure change threshold; when the air pressure change value is smaller than the air pressure change threshold value, the air tightness of the corresponding microphone is judged to be qualified;
l5, after the air tightness judging unit obtains an air tightness judging result, the control module sequentially opens the electromagnetic valve and the inflator pump, and the inflator pump inflates at a certain inflation rate until the air pressure in the air cavity reaches the standard atmospheric pressure; the control module closes the electromagnetic valve and the inflator pump in sequence.
L6. The microphone to be detected is removed from the airtightness detection section 1.
Example 5: a method for detecting the air tightness of a microphone adopts the air tightness detecting system described in embodiment 2, and the method further comprises the following steps before the step L1
L01. Connect the sealing plug with the first port 1-1 of the air-tightness detecting member 1.
L02, the control module sequentially opens the electromagnetic valve and the air extracting pump, and the air extracting pump extracts air at a certain air extracting speed until the air pressure in the air cavity reaches a preset air pressure value; the control module closes the electromagnetic valve and the air extracting pump in sequence, and the first air pressure value obtaining unit obtains a first air pressure value of the air cavity.
When the electromagnetic valve is closed, the first air pressure data acquisition subunit acquires air pressure data at a certain data acquisition frequency. And L022, acquiring one air pressure data from the air pressure data according to the data acquisition sequence to serve as the current air pressure data. L023, comparing the current air pressure data with the previous air pressure data by the first air pressure data analysis subunit, judging that the air pressure data has fluctuation when the difference value of the current air pressure data and the previous air pressure data is more than or equal to an air pressure fluctuation threshold value, and returning to L022; and when the difference value of the current air pressure data and the previous air pressure data is smaller than an air pressure fluctuation threshold value, judging that the air pressure data has no fluctuation, and entering L024. L024, when the last judgment result of the first air pressure data analysis subunit is that the data has fluctuation, the first counting subunit sets the counting value thereof as one and returns to L022; when the last judgment result of the first air pressure data analysis subunit is that the data has no fluctuation, the first counting subunit increments the count value thereof by one and proceeds to L025. L025, comparing the count value of the first counting subunit with a first preset counting threshold by the first count value determining subunit, determining that the air pressure is stable when the count value of the first counting subunit is equal to the first preset counting threshold, and entering L026; otherwise, return to L022. L026. The first gas pressure value acquiring subunit acquires a first gas pressure value of the gas chamber at a corresponding time.
And L03, the timing unit starts to count when the first air pressure value acquisition unit acquires the first air pressure value, and when the timing unit reaches a preset timing value, the second air pressure value acquisition unit acquires a second air pressure value of the gas cavity.
And L04, subtracting the first air pressure value from the second air pressure value by using a fixed air pressure change value determination unit to obtain a fixed air pressure change value, wherein the fixed air pressure change value is used for determining an auxiliary air pressure change threshold value.
L05, after the fixed air pressure change value is obtained, the control module sequentially opens the electromagnetic valve and the inflator pump, and the inflator pump inflates air at a certain inflation rate until the air pressure in the air cavity reaches the standard atmospheric pressure; the control module closes the electromagnetic valve and the inflator pump in sequence.
And L06, removing the sealing plug from the air tightness detecting part 1.
Example 6: a method for detecting the air tightness of a microphone adopts the air tightness detecting system described in embodiment 2, and further comprises a step L00 before the step L1. L00 specifically sets a first air pressure change threshold value through the first air pressure change threshold value setting subunit, and sets a second air pressure change threshold value through the second air pressure change threshold value setting subunit.
The L4 also comprises that when the air pressure change value is less than or equal to a first air pressure change threshold value, the air tightness judging unit judges that the air tightness of the corresponding microphone is finally qualified; when the air pressure change value is larger than or equal to a second air pressure change threshold value, the air tightness judging unit judges that the air tightness of the corresponding microphone is finally unqualified; and when the air pressure change value is greater than the first air pressure change threshold and less than the second air pressure change threshold, the air tightness judging unit judges that the corresponding microphone needs to detect the air tightness again.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention and do not limit the spirit and scope of the present invention. Various modifications and improvements of the technical solutions of the present invention may be made by those skilled in the art without departing from the design concept of the present invention, and the technical contents of the present invention are all described in the claims.
Claims (10)
1. A system for detecting the air tightness of a microphone, characterized in that: comprises that
A gas tightness detection part (1) having a gas cavity with a first cavity opening (1-1) and a second cavity opening (1-2) (1-2), the first cavity opening (1-1) being used for connecting a microphone to be detected;
the electromagnetic valve is connected with the second cavity (1-2) through a first air pipe;
the air pump is connected with the electromagnetic valve through a second air pipe;
the inflator pump is connected with the electromagnetic valve through a third air pipe;
the air pressure detector is arranged in the gas cavity and used for acquiring air pressure data in the gas cavity in real time;
the air pressure display equipment is electrically connected with the air pressure detector and is used for displaying air pressure data in the air cavity in real time;
a control module electrically connected with the electromagnetic valve, the air pump, the inflator pump and the air pressure detector, and the control module comprises
The first air pressure value acquisition unit is used for waiting for the electromagnetic valve to be closed and acquiring a first air pressure value of the air cavity when the air pressure in the air cavity reaches a preset air pressure value;
the timing unit is used for starting timing when the first air pressure value acquisition unit acquires the first air pressure value;
the second air pressure value acquisition unit is used for acquiring a second air pressure value of the air cavity at a corresponding moment when the timing unit reaches a preset timing value;
the air pressure value processing unit is used for subtracting the first air pressure value from the second air pressure value to obtain an air pressure change value;
the air tightness judging unit is used for comparing the air pressure change value with the air pressure change threshold value, and judging that the air tightness of the corresponding microphone is unqualified when the air pressure change value is greater than or equal to the air pressure change threshold value; and when the air pressure change value is smaller than the air pressure change threshold value, judging that the air tightness of the corresponding microphone is qualified.
2. A system for detecting the airtightness of a microphone according to claim 1, wherein: the first air pressure value acquisition unit comprises
The first air pressure data acquisition subunit is used for acquiring air pressure data when the electromagnetic valve is closed;
the first air pressure data analysis subunit is used for comparing the current air pressure data with the previous air pressure data and judging that the air pressure data has fluctuation when the difference value of the current air pressure data and the previous air pressure data is greater than or equal to an air pressure fluctuation threshold value; when the difference value of the current air pressure data and the previous air pressure data is smaller than an air pressure fluctuation threshold value, judging that the air pressure data has no fluctuation;
the first counting subunit is used for setting the counting value of the first air pressure data analysis subunit as one when the current judgment result is that the data is not fluctuated and the last judgment result is that the data is fluctuated; when the current judgment result of the first air pressure data analysis subunit is data fluctuation-free and the last judgment result is data fluctuation-free, the counting value is increased by one;
the first counting value judgment subunit is used for comparing the counting value of the first counting subunit with a first preset counting threshold value, and when the counting value of the first counting subunit is equal to the first preset counting threshold value, judging that the air pressure is stable;
and the first air pressure value acquisition subunit is used for acquiring the first air pressure value of the air cavity at the corresponding moment when the first counting value judgment subunit judges that the air pressure is stable.
3. A system for detecting the airtightness of a microphone according to claim 1, wherein: the airtightness detection system further comprises
The sealing plug is in the same shape as the microphone to be detected and is detachably connected with the first cavity opening (1-1) of the air tightness detection part (1);
the control module further comprises
The first air pressure value acquisition unit is used for waiting for the electromagnetic valve to be closed and acquiring a first air pressure value of the gas cavity when the air pressure in the gas cavity reaches a preset air pressure value;
the second air pressure value acquisition unit is used for acquiring a second air pressure value of the gas cavity at a corresponding moment when the timing unit reaches a preset timing value;
and the fixed air pressure change value determining unit is used for subtracting the first air pressure value from the second air pressure value to obtain a fixed air pressure change value.
4. A system for detecting the airtightness of a microphone according to claim 3, wherein: the first air pressure value acquisition unit comprises
The first air pressure data acquisition subunit is used for acquiring air pressure data when the electromagnetic valve is closed;
the first air pressure data analysis subunit is used for comparing the current air pressure data with the previous air pressure data and judging that the air pressure data has fluctuation when the difference value of the current air pressure data and the previous air pressure data is greater than or equal to an air pressure fluctuation threshold value; when the difference value of the current air pressure data and the previous air pressure data is smaller than an air pressure fluctuation threshold value, judging that the air pressure data has no fluctuation;
the first counting subunit is used for setting the counting value of the first air pressure data analysis subunit to be one when the current judgment result of the first air pressure data analysis subunit is that the data has no fluctuation and the last judgment result of the first air pressure data analysis subunit is that the data has fluctuation; when the current judgment result of the first air pressure data analysis subunit is data non-fluctuation and the last judgment result is data non-fluctuation, the counting value of the first air pressure data analysis subunit is increased by one;
the first counting value judging subunit is used for comparing the counting value of the first counting subunit with a first preset counting threshold value, and judging that the air pressure is stable when the counting value of the first counting subunit is equal to the first preset counting threshold value;
and the first air pressure value acquiring subunit is used for acquiring the first air pressure value of the air cavity at the corresponding moment when the first counting value judging subunit judges that the air pressure is stable.
5. A system for detecting the airtightness of a microphone according to claim 1, wherein: the airtightness judging unit includes
A first air pressure change threshold setting subunit, configured to set a first air pressure change threshold according to the air pressure change threshold; when the air pressure change value is smaller than or equal to the first air pressure change threshold value, the air tightness judging unit judges that the air tightness of the corresponding microphone is finally qualified;
a second air pressure change threshold value setting subunit, configured to set a second air pressure change threshold value according to the air pressure change threshold value; when the air pressure change value is larger than or equal to a second air pressure change threshold value, the air tightness judging unit judges that the air tightness of the corresponding microphone is finally unqualified; and when the air pressure change value is greater than the first air pressure change threshold and less than the second air pressure change threshold, the air tightness judging unit judges that the corresponding microphone needs to detect the air tightness again.
6. A method for detecting the airtightness of a microphone, using the airtightness detection system according to claim 1, wherein: comprises the following steps
L1, connecting a microphone to be detected with a first cavity opening (1-1) of the air tightness detection part (1);
l2, the control module sequentially opens the electromagnetic valve and the air pump, and the air pump pumps air until the air pressure in the air cavity reaches a preset air pressure value; the control module closes the electromagnetic valve and the air extracting pump in sequence, and the first air pressure value acquisition unit acquires a first air pressure value of the air cavity;
l3, the timing unit starts to count when the first air pressure value acquisition unit acquires the first air pressure value, and when the timing unit reaches a preset timing value, the second air pressure value acquisition unit acquires a second air pressure value of the air cavity;
l4, subtracting the first air pressure value from the second air pressure value by the air pressure value processing unit to obtain an air pressure change value; the air tightness judging unit compares the air pressure change value with an air pressure change threshold, and judges that the air tightness of the corresponding microphone is unqualified when the air pressure change value is greater than or equal to the air pressure change threshold; when the air pressure change value is smaller than the air pressure change threshold value, the air tightness of the corresponding microphone is judged to be qualified;
l5, after the air tightness judging unit obtains an air tightness judging result, the control module sequentially opens the electromagnetic valve and the inflator pump, and the inflator pump inflates until the air pressure in the air cavity reaches the standard atmospheric pressure; the control module closes the electromagnetic valve and the inflator pump in sequence;
and L6, removing the microphone to be detected from the air tightness detection part (1).
7. A method for detecting the airtightness of a microphone according to claim 6, wherein: said L2 is specifically comprised of
L21, when the electromagnetic valve is closed, the first air pressure data acquisition subunit acquires air pressure data;
l22, acquiring one air pressure data from the air pressure data according to the data acquisition sequence as the current air pressure data;
l23, comparing the current air pressure data with the previous air pressure data by the first air pressure data analysis subunit, judging that the air pressure data has fluctuation when the difference value of the current air pressure data and the previous air pressure data is greater than or equal to an air pressure fluctuation threshold value, and returning to L22; when the difference value of the current air pressure data and the previous air pressure data is smaller than an air pressure fluctuation threshold value, judging that the air pressure data has no fluctuation, and entering L24;
l24, when the last judgment result of the first air pressure data analysis subunit is that the data has fluctuation, the first counting subunit sets the counting value thereof as one and returns to L22; when the last judgment result of the first air pressure data analysis subunit is that the data is not fluctuated, the first counting subunit adds one to the counting value of the first counting subunit and enters L25;
l25, comparing the count value of the first counting subunit with a first preset counting threshold value, when the count value of the first counting subunit is equal to the first preset counting threshold value, judging that the air pressure is stable, and entering L26; otherwise, returning to L22;
and L26, the air pressure value one acquisition subunit acquires the air pressure value one of the air cavity at the corresponding moment.
8. A method for detecting the airtightness of a microphone according to claim 6, wherein: the following steps are also included before the L1
L01, connecting the sealing plug with a first cavity opening (1-1) of the air tightness detection part (1);
l02, the control module sequentially opens the electromagnetic valve and the air pump, and the air pump pumps air until the air pressure in the air cavity reaches a preset air pressure value; the control module closes the electromagnetic valve and the air extracting pump in sequence, and the first air pressure value acquiring unit acquires a first air pressure value of the air cavity;
l03, the timing unit starts to count when the first air pressure value acquisition unit acquires the first air pressure value, and when the timing unit reaches a preset timing value, the second air pressure value acquisition unit acquires a second air pressure value of the gas cavity;
l04, subtracting the first air pressure value from the second air pressure value by a fixed air pressure change value determination unit to obtain a fixed air pressure change value, wherein the fixed air pressure change value is used for determining an auxiliary air pressure change threshold value;
l05, after the fixed air pressure change value is obtained, the control module sequentially opens the electromagnetic valve and the inflator pump, and the inflator pump inflates until the air pressure in the air cavity reaches the standard atmospheric pressure; the control module closes the electromagnetic valve and the inflator pump in sequence;
and L06, removing the sealing plug from the air tightness detection part (1).
9. The method for detecting the airtightness of the microphone according to claim 8, wherein: said L02 specifically comprises
L021, when the electromagnetic valve is closed, the first air pressure data acquisition subunit acquires air pressure data;
l022, acquiring air pressure data from the air pressure data according to the data acquisition sequence to serve as current air pressure data;
l023, comparing the current air pressure data with the previous air pressure data by the first air pressure data analysis subunit, judging that the air pressure data has fluctuation when the difference value of the current air pressure data and the previous air pressure data is greater than or equal to an air pressure fluctuation threshold value, and returning to L022; when the difference value of the current air pressure data and the previous air pressure data is smaller than an air pressure fluctuation threshold value, judging that the air pressure data has no fluctuation, and entering L024;
l024, when the last judgment result of the first air pressure data analysis subunit is that the data has fluctuation, the first counting subunit sets the counting value thereof as one and returns to L022; when the last judgment result of the first air pressure data analysis subunit is that the data has no fluctuation, the first counting subunit adds one to the counting value and enters L025;
l025, comparing the count value of the first counting subunit with a first preset counting threshold by the first count value determining subunit, determining that the air pressure is stable when the count value of the first counting subunit is equal to the first preset counting threshold, and entering L026; otherwise, returning to L022;
l026. The first gas pressure value acquiring subunit acquires a first gas pressure value of the gas chamber at a corresponding time.
10. A method for detecting the airtightness of a microphone according to claim 6, wherein: further comprising the step of preceding said L1
L00, setting a first air pressure change threshold value through a first air pressure change threshold value setting subunit, and setting a second air pressure change threshold value through a second air pressure change threshold value setting subunit;
the L4 also comprises that when the air pressure change value is less than or equal to a first air pressure change threshold value, the air tightness judging unit judges that the air tightness of the corresponding microphone is finally qualified; when the air pressure change value is larger than or equal to a second air pressure change threshold value, the air tightness judging unit judges that the air tightness of the corresponding microphone is finally unqualified; and when the air pressure change value is greater than the first air pressure change threshold and less than the second air pressure change threshold, the air tightness judging unit judges that the corresponding microphone needs to detect the air tightness again.
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