CN113447081B - Comprehensive detection device for tightness, exhalation resistance and inhalation resistance of breathing mask - Google Patents
Comprehensive detection device for tightness, exhalation resistance and inhalation resistance of breathing mask Download PDFInfo
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- CN113447081B CN113447081B CN202110820849.3A CN202110820849A CN113447081B CN 113447081 B CN113447081 B CN 113447081B CN 202110820849 A CN202110820849 A CN 202110820849A CN 113447081 B CN113447081 B CN 113447081B
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Abstract
The invention relates to comprehensive detection of gas tightness, inhalation resistance and exhalation resistance of a gas mask, in particular to a comprehensive detection device of gas tightness, exhalation resistance and inhalation resistance of a gas mask, which comprises a cabinet body and an adsorption mould, wherein a PLC (programmable logic controller), a vacuum pump and an air compressor are arranged in the cabinet body; the invention adopts the meters such as the pressure meter, the vacuum meter, the flowmeter and the like, and the system automatically reads the recorded data to judge the qualification, thereby solving the problems of high error, misjudgment, missed judgment and the like caused by manual operation of the existing meters.
Description
Technical Field
The invention relates to comprehensive detection of gas tightness, inhalation resistance and exhalation resistance of a gas mask, in particular to a comprehensive detection device of gas tightness, exhalation resistance and inhalation resistance of a gas mask.
Background
The main inspection items of the gas mask comprise the items of air tightness, air suction resistance, air breathing resistance and the like, and 100% of the items are required to be self-inspected in the production process; the user draws 50 to 80 items from 1000 items per batch before delivery and re-checks the three items. The three items are detected by three special detection tools in the current production, and the tools adopt the detection instrument which is a U-shaped tube differential pressure meter, an inclined U-shaped tube differential pressure meter, an orifice plate flowmeter and other instruments; the detection comprises three working procedures, wherein each working procedure is required to manually assemble the mask with an turnover head band, then wear the mask to a head die, read out, record, detach the mask, and convert the detection result according to a formula. The three processes require repeating the above operations. The existing detection method has the problems that the detection process is behind, the procedure operation is complex, the production efficiency is low, the detection result precision is low, the error of the detection result of a product is large due to different methods of operators or irregular observation, the phenomena of missed judgment and misjudgment occur in the process of checking and accepting the product, the detection progress and the checking of the mask are seriously influenced, and the production efficiency of the mask is also restricted. Therefore, the design automation degree is high, the detection method is simple, and the detection device with high detection precision and high efficiency is imperative.
Disclosure of Invention
The invention replaces the U-shaped tube differential pressure meter, the inclined U-shaped tube differential pressure meter, the orifice plate flowmeter and other meters of the current detection device by adopting the electronic digital display pressure meter, the vacuum meter, the flowmeter and other high-precision meters, and automatically reads the recorded data by the system to judge whether the current detection device is qualified, thereby solving the problems of large error, product misjudgment, missed judgment and the like caused by manual operation of the current meters with low precision.
The invention is realized by adopting the following technical scheme: the comprehensive detection device for the tightness, the expiration resistance and the inspiration resistance of the breathing mask comprises a cabinet body and an adsorption mold, wherein a PLC controller, a vacuum pump and an air compressor are arranged in the cabinet body, a PLC display screen is arranged on the cabinet body, the adsorption mold is a face-imitated mold, a negative pressure adsorption groove is arranged at the reverse edge folding position of the adsorption mold, a negative pressure adsorption hole is arranged at the bottom of the negative pressure adsorption groove, the vacuum pump is connected with the negative pressure adsorption hole through a negative pressure adsorption pipeline, a first electromagnetic valve and a vacuum gauge are further arranged on the negative pressure adsorption pipeline, two vent holes are formed in an area surrounded by the negative pressure adsorption groove of the adsorption mold, namely a compressed air vent hole and a negative pressure vent hole, the vacuum pump is connected with the negative pressure vent hole through an air tightness detection pipeline, and a second electromagnetic valve and an air tightness detection flowmeter are further arranged on the air tightness detection pipeline; the vacuum pump is also connected with the negative pressure vent hole through an air suction resistance pipeline, and the air suction resistance pipeline is also provided with a third electromagnetic valve and an air suction detection flowmeter; the air compressor is connected with the compressed air vent hole through an expiration resistance pipeline, and a fourth electromagnetic valve and an expiration detection flowmeter are further arranged on the expiration resistance pipeline; the vent hole is also connected with a digital micro-pressure gauge through a pipeline, and the first electromagnetic valve, the vacuum meter, the second electromagnetic valve, the airtight detection flowmeter, the third electromagnetic valve, the inspiration detection flowmeter, the fourth electromagnetic valve, the expiration detection flowmeter, the PLC display screen and the digital micro-pressure gauge are all connected with the PLC;
the detection process is as follows: opening a first electromagnetic valve and a digital micro-manometer on a negative pressure adsorption pipeline, opening the negative pressure adsorption pipeline, placing a mask on a detection head die, fully sealing a reverse flanging of the mask and the detection head die under the negative pressure adsorption effect of a circle of negative pressure adsorption groove on the periphery of the detection head die, and when the vacuum gauge detects that the adsorption pressure of the reverse flanging part is greater than or equal to a set pressure P1, confirming that the mask and the detection head die are fully sealed, then sealing the joint part of the tank, and simultaneously opening a second electromagnetic valve;
after the second electromagnetic valve is opened, the air tightness detection pipeline is communicated, namely the vent hole on the detection head die is communicated with the air tightness detection pipeline, so that negative pressure is formed in the mask, a digital micro-manometer detects the negative pressure in the mask in real time, when the negative pressure reaches a specified value P2, the second electromagnetic valve is closed, a timer is started, the digital micro-manometer monitors the pressure drop value in the mask in real time, when the timer times to a specified value T1, the actual measurement drop value and the set drop specified value P3 are compared, and the following operations are respectively executed according to the difference of the comparison results, 1) the actual measurement pressure drop value does not exceed the drop specified value, the mask is judged to be detected to be qualified, the actual measurement pressure drop value and the judging qualified result are recorded in a PLC and are displayed on a PLC (programmable logic controller) in real time, and the step of detecting the expiratory resistance is shifted; 2) If the measured pressure drop value exceeds a specified value, judging that the mask is unqualified in detection, interrupting subsequent detection, recording the measured pressure drop value and the unqualified judgment result in a PLC controller and displaying the results on a PLC display screen in real time, wherein the mask is unqualified in air tightness detection, and a new detection product is replaced;
if the air tightness is detected to be qualified, a fourth electromagnetic valve is opened, an expiration resistance pipeline is communicated, a mask cavity is communicated with an air compressor, the air flow entering the mask cavity is controlled to be ML/min constant air flow according to a set value, a timer is started, the expiration resistance is monitored in real time through a digital micro-manometer, when the timer counts to a set time, the fourth electromagnetic valve is closed, an actually measured maximum resistance value and a resistance set value P4 set by a system are compared, and the following operations are respectively executed according to different comparison results: 1) If the measured maximum resistance value does not exceed the specified value, the system judges that the mask exhalation resistance is qualified, the measured maximum resistance value and the judging qualified result are recorded in the PLC controller and displayed on the PLC display screen in real time, and then the inhalation resistance detection step is carried out, 2) if the measured maximum resistance value exceeds the specified value, the mask exhalation resistance is judged to be unqualified, the measured maximum resistance value and the judging unqualified result are recorded in the PLC controller and displayed on the PLC display screen in real time, and the subsequent detection is interrupted;
after the expiration resistance is detected to be qualified, opening a sealing plug of a joint of the mask tank, opening a third electromagnetic valve, communicating an inspiration resistance pipeline, communicating an inner cavity of the mask with a vacuum pump, controlling constant air flow with NL/min of air flow flowing out of the inner cavity of the mask according to a set value, starting a timer, monitoring the inspiration resistance in real time through a digital micro-manometer, closing the third electromagnetic valve when the timer counts to a set time T3, comparing an actually measured maximum resistance value with a resistance value P5 set by a system, and executing the following operations according to different comparison results; 1) And 2) if the actually measured maximum resistance value exceeds the specified value, judging that the mask inhalation resistance is unqualified, replacing the mask, recording the actually measured maximum resistance value and the judging result in the PLC controller and displaying the result on the PLC display screen in real time, and prompting that the mask is unqualified, and recording the actually measured maximum resistance value and the judging result in the PLC controller and displaying the result on the PLC display screen in real time.
The comprehensive detection device for the tightness, the expiration resistance and the inspiration resistance of the breathing mask is characterized in that the PLC is also connected with a negative pressure adsorption indication yellow lamp, a green qualification indicator lamp, a disqualification indication red lamp and an audible and visual alarm, when the mask is completely sealed with the detection head die, the negative pressure adsorption indication yellow lamp is on, and the audible and visual alarm gives an audible and visual alarm, when the mask is qualified, the green qualification indicator lamp is on, when the mask is unqualified, the disqualification indication red lamp is on, and the audible and visual alarm gives an audible and visual alarm.
According to the comprehensive detection device for the tightness, the expiration resistance and the inspiration resistance of the breathing mask, the three input ends of the PLC are respectively connected with the negative pressure button, the starting button and the inspiration button, the negative pressure button, the starting button and the inspiration button are all arranged on the panel of the cabinet body, when detection is started, the negative pressure button is firstly pressed, the first electromagnetic valve on the negative pressure adsorption pipeline is opened, when the tightness detection is started, the starting button is pressed, the second electromagnetic valve is opened, if the tightness detection is qualified, the fourth electromagnetic valve is opened by the PLC, if the tightness detection is not qualified, the opening button is pressed, if the expiration resistance detection is qualified, the opening button is also pressed, when the inspiration resistance detection is started, the inspiration button is firstly pressed, the third electromagnetic valve is opened, when the inspiration resistance detection is qualified, if the inspiration resistance detection is not qualified, the inspiration button is also pressed, and the negative pressure button is pressed after the detection is finished.
The comprehensive detection device for the tightness, the expiratory resistance and the inspiratory resistance of the breathing mask is characterized in that the expiratory resistance pipeline is also provided with a pressure regulating valve.
According to the invention, by designing a novel comprehensive detection device for the tightness, the expiratory resistance and the inspiratory resistance of the breathing mask, three current detection tools are replaced; and through high-precision instruments, meters and electronic control systems, the full automation of the detection process is realized, and the related quality data and detection data of product detection are automatically detected, judged and recorded, so that the existing manual detection is replaced. The comprehensive detection device has the advantages of simple detection process, high detection precision, wide application range and more than one time of the production efficiency of manual detection.
Drawings
FIG. 1 is a schematic view of the apparatus of the present invention.
Fig. 2 is a schematic diagram of a PLC controller according to the present invention.
In the figure: the device comprises a 1-adsorption die, a 2-mask, a 3-vacuum pump, a 4-air compressor, a 5-first electromagnetic valve, a 6-vacuum meter, a 7-second electromagnetic valve, an 8-airtight detection flowmeter, a 9-third electromagnetic valve, a 10-inspiration detection flowmeter, a 11-fourth electromagnetic valve, a 12-expiration detection flowmeter, a 13-digital micro-pressure meter and a 14-pressure regulating valve.
Detailed Description
Comprehensive detection device detects
1 general scheme design of comprehensive detection device for gas mask
1.1 design of gas tightness, inspiration resistance and expiration resistance combined detection scheme of gas mask
The common principle and differences of three detection items are determined through research on the detection method of the detection principle of the tightness, the inhalation resistance and the exhalation resistance of the breathing mask and the related standards, and the invention determines the following general design scheme.
The procedure of assembling the turnover head bands by the mask is canceled, and the assembling and combining mode of the mask and the detection head die is changed from the original mode that 6 head bands are tensioned after the mask is assembled to the detection head die, so that the mask reverse flanging is bonded and sealed with the detection head die, and the mask reverse flanging is directly bonded and sealed with the detection head die through negative pressure adsorption on the detection head die; through principle analysis of three detection items of the tightness, the inspiration resistance and the expiration resistance of the breathing mask, detection pipelines of the three items are integrated, detection of the three items of the mask is improved from an original three-set instrument to be completed on a comprehensive detection device, the mask can complete detection of the three items only by being combined with a detection head die once, and the detection process realizes automatic detection.
1.1.1 design of the combination of mask and detection head die
The mask and the detection head die of the novel comprehensive detection device adopt a negative pressure automatic adsorption technology (the turnover head band is not required to be assembled), namely, the mask is correctly placed on the detection head die, and the reverse flanging of the mask is completely adsorbed on the reverse flanging part of the detection head die and is ensured to be completely adhered and sealed under the negative pressure adsorption effect in the negative pressure adsorption groove at the periphery of the outer edge of the detection head die.
The principle of negative pressure adsorption is that a narrow groove with uniform width is formed along the periphery of the detection head die and the mask reverse flanging at the combined position, the groove bottom is provided with a hole and is communicated with a vacuum pump, the vacuumizing quantity of vacuumizing is controlled by a valve on a circuit, and when the vacuum pump is started, a product is adsorbed on the detection head die through the negative pressure adsorption groove.
1.1.2 high precision detection head die design
The invention designs a mask detection head die by using aluminum alloy three-dimensional simulation, wherein a negative pressure adsorption groove is arranged on the periphery of the reverse edge of the detection head die, and the negative pressure adsorption groove is communicated with a negative pressure adsorption hole and is connected with a negative pressure adsorption pipeline. During detection, the mask reverse edge is completely attached and sealed with the detection head die under the action of negative pressure adsorption in the negative pressure adsorption tank. The position of the mouth and nose of the detection head die is designed with two vent holes, the negative pressure vent hole is communicated with the air tightness detection pipeline and the inhalation resistance pipeline, and the compressed air vent hole is communicated with the exhalation resistance detection pipeline.
1.1.3 detection flow design
Firstly, the mask and the detection head die are combined and sealed through negative pressure adsorption, after the detection instrument system detects that the mask and the detection head die are sealed in place (through negative pressure adsorption pressure setting and judging), the air tightness of the mask is detected firstly, then the exhalation resistance and the inhalation resistance are sequentially detected, the establishment of the detection sequence is determined according to the detection characteristics of three items, the tank joint part of the mask is sealed during the air tightness detection and the exhalation force detection, and the tank joint part is required to be opened during the inhalation resistance, so that the detection flow is designed into air tightness detection_exhalation resistance detection_inhalation resistance detection for simplifying the operation.
1.2. Detection principle of comprehensive detection device
1.2.1 negative pressure adsorption principle
The method comprises the steps of pressing a button in an airtight manner on a panel of the comprehensive detection device, opening a first electromagnetic valve on a negative pressure adsorption pipeline, opening the negative pressure adsorption pipeline, correctly placing the mask on a detection head die, fully sealing a reverse edge of the mask and the detection head die under the negative pressure adsorption effect of a circle of negative pressure adsorption groove on the periphery of the detection head die, and when the adsorption pressure of the reverse edge part detected by the system is more than or equal to a set pressure P1, confirming that the mask and the detection head die are fully sealed, and prompting an operator to seal a tank joint part by a yellow lamp in a negative pressure adsorption indication and an audible-visual alarm manner, and simultaneously automatically opening a second electromagnetic valve by the system.
1.2.2 principle of gas tightness detection
After a start button on a panel of the comprehensive detection device is pressed down, a second electromagnetic valve is opened, an air tightness detection pipeline is communicated, namely a detection vent hole on a detection head die is communicated with a negative pressure pipeline, so that negative pressure is formed in a mask, a digital micro-manometer detects the negative pressure in the mask in real time, when the negative pressure reaches a specified value P2, a system automatically closes the second electromagnetic valve, a timer is started, the digital micro-manometer monitors the pressure drop value in the mask in real time, when the timer times to a specified T1, the system compares the actually measured drop value with a set drop specified value P3 of the system, and the following operations are respectively executed according to different comparison results:
1) If the measured pressure drop value does not exceed the specified value, namely the measured value is less than or equal to P3, the system judges that the mask is qualified for detection, the system starts a green qualified indicator lamp, the measured value and the qualified result of judgment are recorded in the system and displayed on a PLC display screen in real time, and the system automatically shifts to an expiratory resistance detection step.
2) If the measured pressure drop value exceeds a specified value, namely, the measured value is more than P3, the system judges that the mask is unqualified in detection, automatically interrupts subsequent detection, records the measured value and the unqualified judging result in the system and displays the result on a display screen in real time, and prompts an operator that the mask is unqualified in gas tightness detection and a new detection product is replaced.
1.2.3 exhalation resistance detection principle
If the air tightness is detected to be qualified, the system automatically opens a fourth electromagnetic valve, the exhalation resistance pipeline is communicated, and the inner cavity of the mask is communicated with the air compressor.
The system controls the air flow entering the inner cavity of the mask to be ML/min constant T2 air flow according to the set value, and simultaneously starts a timer, wherein the system monitors the expiratory resistance in real time through a digital micro-manometer, when the timer counts to a set time, the system automatically closes a fourth electromagnetic valve, compares the actually measured maximum resistance value with a resistance set value P4 set by the system, and respectively executes the following operations according to different comparison results:
1) If the measured resistance value is not more than a specified value, namely the measured value is less than or equal to P4, the system judges that the exhalation resistance of the mask is qualified, a green qualified indicator lamp is lighted, the measured value and the qualified judgment result are recorded in the system and displayed on a PLC display screen in real time, and the system automatically shifts to the inhalation resistance detection step.
2) If the actual measured resistance value exceeds a specified value, namely the actual measured value is more than P4, the system judges that the detection of the exhalation resistance of the mask is unqualified, the unqualified indicator red light is lighted, and the audible and visual alarm is given to prompt an operator that the detection of the exhalation resistance of the mask is unqualified, the system records the actual measured value and the unqualified judgment result in the system and displays the results on a display screen in real time, and the system automatically interrupts the subsequent detection.
1.2.4 principle of detection of the resistance to inspiration
After the green qualified indicator lamp of expiration resistance lights, operating personnel opens the sealing plug of the mask tank connector, presses the expiration button on the panel, then opens the third electromagnetic valve, the inspiration resistance pipeline is communicated, the inner cavity of the mask is communicated with the vacuum pump, the system controls the air flow flowing out of the inner cavity of the mask to be NL/min constant air flow according to the set value, simultaneously starts a timer, the system monitors the inspiration resistance in real time through a digital micro-manometer, when the timer counts to a specified time T3, the system automatically closes the third electromagnetic valve, compares the actually measured maximum resistance value with the resistance value P5 set by the system, and executes the following operations according to different comparison results.
1) The measured resistance value is not more than a specified value, namely the measured value is less than or equal to P5, the system judges that the inhalation resistance of the mask is qualified, a green qualified indicator lamp is lightened to remind an operator that all detection items of the mask are qualified, a new mask can be replaced, the measured value and the qualified judgment result are recorded in the system and displayed on a PLC display screen in real time,
2) If the actual measured resistance value exceeds a specified value, namely the actual measured value is more than P5, the system judges that the detection of the exhalation resistance of the mask is unqualified, the unqualified indicator red light is lighted, and the audible and visual alarm is given to the operator that the mask is unqualified, the mask is replaced, and the system records the actual measured value and the unqualified judgment result in the system and displays the results on a display screen in real time.
1.3 principle of electrical control (in connection with FIG. 2)
1.3.1 negative pressure control
1. Pressing the negative pressure button PBA1: a1 is conducted, and 00000 signals enter the PLC;
2. the PLC signal 1000 is output, the A2 voltage is output, and the negative pressure electromagnetic valve VALA1 (first electromagnetic valve) is opened;
3. the pressure AL value P1 can be set on the L vacuum gauge;
4. sleeving a workpiece on the die; after the workpiece is sleeved, the L vacuum gauge reaches a negative pressure set value, the output point of the L vacuum gauge is closed, and an electric signal obtained by A3 enters the 00001 point of the PLC;
5. the PLC output point 10001 outputs, the A4 is powered on, the indicator light LG-A1 lights up, the 10100 point outputs, the A13 is powered on, and the audible and visual alarm BZ-A sends out audible and visual prompts;
thereafter, the next operation can be entered
1.3.2 air tightness test
Pressing the start button PBA2:a13, power-off and audible and visual alarm disappear; />A7, powering on, opening a VLA3 airtight detection valve (a second electromagnetic valve) for exhausting, and adjusting the airtight detection flowmeter to 500ml/min (adjustable); />When the pressure reaches a set value P2 (settable), the airtight detection valve VLA3 is closed and starts timing, when the pressure reaches T1 (settable), the airtight detection is finished, and if the pressure is qualified, the next step of expiration detection is automatically carried out; if the mask is not qualified, the red light LG-A3 is lightened, the acousto-optic report is displayed, the mask detection is finished, and the starting button PBA2 is pressed;
1.3.3 expiration detection
The expiration detecting valve VLA4 (fourth electromagnetic valve) opens the inflation and timing T2 (30 s is settable), and the expiration detecting flowmeter is adjusted to ML/min; />When the timing is finished, the expiration detection valve VLA4 is closed, if the timing is qualified, the green light LG-A2 is indicated to be on, and the audible and visual alarm is given, so that the next inspiration detection can be carried out, and the start button PBA2 is pressed; if the mask is not qualified, the red light LG-A3 is lightened, the audible and visual alarm BZ-A is given out, the mask detection is finished, and the starting button PBA2 is pressed;
1.3.4 inhalation detection
Removing the plastic plug of the air suction port; pressing the inspiration button PBA3:the BZ-A acousto-optic prompt disappears; />The suction detection valve VALA5 (third electromagnetic valve) is opened for suction and timing T3 (settable), and the suction detection flowmeter is adjusted to NL/min; />When the timing is finished, the inspiration detection valve VALA5 is closed, if the qualified green qualified indicator light LG-A2 is lightened and the sound and light prompt BZ-A is given, the mask detection is finished, and the inspiration button PBA3 is pressed; the failure indication red light LG-A3 and the audible and visual alarm BZ-A indicate that the mask detection is finished, and an inhalation button PBA3 is pressed;
1.3.5 end of detection
When the negative pressure button PBA1 is pressed, the negative pressure valve VALA1 is powered off and disconnected, and all other indicator lamps and alarms are powered off to restore to the initial state: the mask is removed, classified and then the next mask can be re-detected.
Compared with the prior art, the method has the advantages that:
1) The comprehensive detection device for the tightness, the inspiration resistance and the expiration resistance of the breathing mask has the advantages of simple detection process and convenient operation, and realizes the automatic detection of the detection process to replace manual detection;
2) The comprehensive detection device adopts an electronic digital display pressure gauge, a vacuum gauge and a mass flowmeter to replace a U-shaped tube differential pressure gauge and an inclined U-shaped tube differential pressure gauge in the prior art, and has the characteristics of wide measurement range, high precision and the like;
3) The detection process is combined with a control system consisting of a PLC, a touch screen and the like, so that automatic detection and judgment results are realized, detection data are recorded, the pressure conversion is performed again according to a formula after the height of the water column is observed manually in the prior art, the observation error and calculation error are eliminated, and the detection results are more accurate and real;
4) The comprehensive detection device combines the negative pressure air tightness, the inspiration resistance and the expiration resistance of three working procedures in the prior art into one working procedure, the whole detection process realizes automatic detection, qualification judgment and detection data recording, and the problems of misjudgment, missed judgment and the like possibly caused by manual detection are avoided;
5) The detection process is simplified, the production efficiency is improved, the labor intensity of operators is reduced, and the single mask detection operation time is 2 minutes;
6) The system for collecting the product quality information is capable of recording the relevant quality information of each batch of products, and the fault parts of unqualified products are convenient for technical departments to monitor and count the product quality and develop quality analysis research.
Claims (4)
1. The utility model provides a gas mask gas tightness, expiration resistance and resistance comprehensive detection device that breathes in, its characterized in that: the vacuum pump (3) is connected with the negative pressure adsorption hole through a negative pressure adsorption pipeline, the negative pressure adsorption pipeline is also provided with a first electromagnetic valve (5) and a vacuum gauge (6), two vent holes are formed in an area surrounded by the negative pressure adsorption groove of the adsorption mould, namely a compressed air vent hole and a negative pressure vent hole, the vacuum pump (3) is connected with the negative pressure vent hole through an air tightness detection pipeline, and a second electromagnetic valve (7) and an air tightness detection flowmeter (8) are further arranged on the air tightness detection pipeline; the vacuum pump is also connected with the negative pressure vent hole through an air suction resistance pipeline, and the air suction resistance pipeline is also provided with a third electromagnetic valve (9) and an air suction detection flowmeter (10); the air compressor (4) is connected with the compressed air vent through an expiration resistance pipeline, and a fourth electromagnetic valve (11) and an expiration detection flowmeter (12) are further arranged on the expiration resistance pipeline; the vent hole is also connected with a digital micro-pressure meter (13) through a pipeline, and the first electromagnetic valve (5), the vacuum meter (6), the second electromagnetic valve (7), the airtight detection flowmeter (8), the third electromagnetic valve (9), the inspiration detection flowmeter (10), the fourth electromagnetic valve (11), the expiration detection flowmeter (12) and the digital micro-pressure meter (13) are all connected with the PLC;
the detection process is as follows: a first electromagnetic valve and a digital micro-manometer (13) on a negative pressure adsorption pipeline are started, the negative pressure adsorption pipeline is opened, a mask is placed on a detection head die, a reverse flanging of the mask is completely sealed with the detection head die under the negative pressure adsorption effect of a circle of negative pressure adsorption groove on the periphery of the detection head die, when the vacuum gauge (6) detects that the adsorption pressure of the reverse flanging part is greater than or equal to a set pressure P1, the mask and the detection head die are confirmed to be completely sealed, then the joint part of a tank is sealed, and a second electromagnetic valve (7) is opened;
after the second electromagnetic valve (7) is opened, the air tightness detection pipeline is communicated, namely the vent hole on the detection head mould is communicated with the air tightness detection pipeline, so that negative pressure is formed in the mask, a digital micro-manometer (13) detects the negative pressure in the mask in real time, when the negative pressure reaches a specified value P2, the second electromagnetic valve is closed, a timer is started, the digital micro-manometer monitors the pressure drop value in the mask in real time, when the timer counts to a specified value T1, the actually measured drop value and the set drop specified value P3 are compared, and the following operations are respectively executed according to the difference of the comparison results, 1) if the actually measured pressure drop value does not exceed the drop specified value, the mask is judged to be detected to be qualified, the actually measured pressure drop value and the judged qualified result are recorded in a PLC (programmable logic controller) and displayed on a PLC display screen in real time, and the step of detecting the expiratory resistance is shifted; 2) If the measured pressure drop value exceeds a specified value, judging that the mask is unqualified in detection, interrupting subsequent detection, recording the measured pressure drop value and the unqualified judgment result in a PLC controller and displaying the results on a PLC display screen in real time, wherein the mask is unqualified in air tightness detection, and a new detection product is replaced;
if the air tightness is detected to be qualified, a fourth electromagnetic valve (11) is opened, an expiration resistance pipeline is communicated, a mask inner cavity is communicated with an air compressor (4), the air flow entering the mask inner cavity is controlled to be ML/min constant air flow according to a set value, a timer is started, the expiration resistance is monitored in real time through a digital micro-manometer, when the timer counts to a specified time, the fourth electromagnetic valve (11) is closed, a measured maximum resistance value and a resistance specified value P4 set by a system are compared, and the following operations are respectively executed according to different comparison results: 1) If the measured maximum resistance value does not exceed the specified value, the system judges that the mask exhalation resistance is qualified, the measured maximum resistance value and the judging qualified result are recorded in the PLC controller and displayed on the PLC display screen in real time, and then the inhalation resistance detection step is carried out, 2) if the measured maximum resistance value exceeds the specified value, the mask exhalation resistance is judged to be unqualified, the measured maximum resistance value and the judging unqualified result are recorded in the PLC controller and displayed on the PLC display screen in real time, and the subsequent detection is interrupted;
after the expiration resistance is detected to be qualified, opening a sealing plug of a joint of the mask tank, opening a third electromagnetic valve (9), communicating an inspiration resistance pipeline, communicating an inner cavity of the mask with a vacuum pump (3), controlling constant airflow with the air flow rate NL/min flowing out of the inner cavity of the mask according to a set value, starting a timer, monitoring the inspiration resistance in real time through a digital micro-manometer, closing the third electromagnetic valve (9) when the timer counts to a specified time T3, comparing an actually measured maximum resistance value with a resistance value P5 set by a system, and executing the following operations according to different comparison results; 1) And 2) if the actually measured maximum resistance value exceeds the specified value, judging that the mask inhalation resistance is unqualified, replacing the mask, recording the actually measured maximum resistance value and the judging result in the PLC controller and displaying the result on the PLC display screen in real time, and prompting that the mask is unqualified, and recording the actually measured maximum resistance value and the judging result in the PLC controller and displaying the result on the PLC display screen in real time.
2. The comprehensive detection device for tightness, resistance to exhalation and resistance to inhalation of a respirator according to claim 1, wherein: the PLC is also connected with a negative pressure adsorption indication yellow lamp, a green qualification indicator lamp, a disqualification indication red lamp and an audible and visual alarm, when the mask is completely sealed with the detection head mould, the negative pressure adsorption indication yellow lamp is on and the audible and visual alarm gives an audible and visual alarm, when the detection is qualified, the green qualification indicator lamp is on, when the detection is unqualified, the disqualification indication red lamp is on, and the audible and visual alarm gives an audible and visual alarm.
3. The gas mask tightness, exhalation resistance and inhalation resistance integrated detection device according to claim 1 or 2, characterized in that: the three input ends of the PLC are respectively connected with a negative pressure button, a starting button and an air suction button, the negative pressure button, the starting button and the air suction button are all positioned on a panel of the cabinet body, when detection is started, the negative pressure button is firstly pressed, a first electromagnetic valve (5) on a negative pressure adsorption pipeline is opened, when air tightness detection is started, the starting button is pressed, a second electromagnetic valve (7) is opened, if the air tightness detection is qualified, the PLC opens a fourth electromagnetic valve (11), if the air tightness detection is not qualified, the opening button is pressed, if the air suction resistance detection is not qualified, the opening button is pressed, when the air suction resistance detection is qualified, the air suction button is pressed, and the negative pressure button is pressed after the detection is finished.
4. The gas mask tightness, exhalation resistance and inhalation resistance integrated detection device according to claim 1 or 2, characterized in that: the breathing resistance pipeline is also provided with a pressure regulating valve (14).
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| CN210834590U (en) * | 2019-08-23 | 2020-06-23 | 江苏国健检测技术有限公司 | Breathing resistance test system for protective mask |
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| US5303699A (en) * | 1991-11-18 | 1994-04-19 | Intermed Equipamento Medico Hospitalar Ltda. | Infant ventilator with exhalation valves |
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