CN114323490A - Automatic double-path linkage airtight detection method for product - Google Patents
Automatic double-path linkage airtight detection method for product Download PDFInfo
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- CN114323490A CN114323490A CN202111579709.8A CN202111579709A CN114323490A CN 114323490 A CN114323490 A CN 114323490A CN 202111579709 A CN202111579709 A CN 202111579709A CN 114323490 A CN114323490 A CN 114323490A
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Abstract
The invention relates to a product two-way linkage airtight automatic detection method, wherein a PLC (programmable logic controller) identifies two ways of pressure in real time and automatically judges the relation between pressure difference and limit pressure difference, and after the airtight detection of the whole process is finished, the maximum limit pressure difference and the airtight result of each way in the process are automatically judged. The invention can replace the original manual whole-process manual inflation and tracking judgment pressure difference, realize the double-path linkage air tightness detection automation, automatically judge the result, fully detect the double-path air tightness of the hard oil tank and the flexible oil tank and ensure the safety quality reliability of the two paths, further realize the air tightness detection verification and improve the automation degree and reliability of the air tightness detection, greatly reduce the manual labor intensity and improve the efficiency of the double-path air tightness detection.
Description
Technical Field
The invention belongs to the technical field of airtightness detection of low-pressure systems, and particularly relates to a double-path linkage airtightness automatic detection method for a product, in particular to a double-path linkage airtightness detection method for a hard oil tank and a flexible oil tank.
Background
Along with the change of product technical development and product flight index, the aerospace product is changed from the original single hard oil tank to the hard oil tank and is supplied with products by storing fuel between the hard oil tank and the internal flexible oil tank, and the flexible oil tank is additionally arranged inside the hard oil tank, so that the flexible oil tank elastically swells to improve the supply pressure of product fuel along with the fuel consumption in the working process of the product. After the final assembly of the product is completed, the air tightness of the hard oil tank and the flexible oil tank of the product is required to be ensured, and the flexible oil tank cannot be too large due to the material problem and the pressure difference between the pressure and the outside (inside the hard oil tank), otherwise, the flexible oil tank is damaged due to too large expansion. According to the product requirements, the air tightness of the two paths under different air tightness pressure conditions needs to be verified. The double-path detection complexity of the hard oil tank and the flexible oil tank is higher due to the factors.
Disclosure of Invention
The invention provides a product two-way linkage airtight automatic detection method, which aims to solve the technical problems that: the problem of airtight detection of rigid oil tank and flexible oil tank double-circuit linkage under the change condition of product technical development and product flight index is solved.
In order to solve the technical problems, the invention provides a product two-way linkage airtight automatic detection method, which is characterized by comprising the following steps of: the adopted air tightness checking equipment comprises a first control proportional valve 1, a first pressure sensor 2, a second control proportional valve 3, a second pressure sensor 4 and a PLC 5; the air tightness inspection equipment is provided with two air outlets which are respectively connected with a hard oil tank 8 and a flexible oil tank 9 of a detected product, the flexible oil tank is arranged in the hard oil tank, the first control proportional valve 1 and the first pressure sensor 2 are used for controlling the first air outlet, and the second control proportional valve 3 and the second pressure sensor 4 are used for controlling the second air outlet; the specific detection steps are as follows:
s1, setting airtight pressure build-up pressure, inflation rate, pressure maintaining time, pressure stabilizing time and two-way limit pressure difference value delta P of each stage in the PLC at the two-way airtight detection parameter setting stage, and controlling the second control proportional valve 3 and the second pressure sensor 4 to inflate the flexible oil tank 9;
s2, the PLC controls the second control proportional valve 3 to automatically inflate to build pressure, maintain pressure and stabilize pressure, and the second pressure sensor 4 detects the pressure value P1 of the channel in real time and automatically compares the pressure technical parameters set by the channel to judge;
s3, after the air tightness detection of the flexible oil tank air passage is finished, namely the final pressure maintaining is finished, the PLC automatically identifies the end of the air tightness of the air passage;
s4, automatically entering a hard oil tank airtightness detection process under the control of a PLC, automatically inflating and building pressure, maintaining pressure and stabilizing pressure of the hard oil tank airtightness by a first control proportional valve 1 according to the airtightness detection requirement of the hard oil tank, and automatically comparing and judging a pressure value P2 of the path with a pressure technical parameter set by the path by a first pressure sensor 2 in real time;
s5, in the airtight detection process of the hard oil tank, detecting the pressure difference delta P ' of the air passage of the hard oil tank and the flexible oil tank in real time, and automatically judging the relation between the delta P ' (P2-P1) and the delta P, wherein the delta P ' is required to be not more than the delta P;
s6, when the pressure difference delta P ' between the gas circuits of the hard oil tank and the flexible oil tank is larger than delta P in the airtight detection process, the PLC controls the hard oil tank to automatically deflate, detects the pressure P2 of the gas circuit of the hard oil tank and the pressure difference delta P ' of the gas circuit in real time, stops deflating the gas circuit of the hard oil tank when the pressure delta P ' is not larger than delta P, detects whether the pressure P2 of the gas circuit of the hard oil tank meets the set pressure parameter requirement of the gas circuit after the two-way pressure is stable, and repeats the step S4 to build pressure, stabilize pressure and maintain pressure if the pressure of the gas circuit of the hard oil tank is not larger than delta P;
and S7, after the detection of the gas circuits of the hard oil tank and the flexible oil tank is finished, the PLC automatically compares the gas tightness of the gas circuits of all links of the whole process with the set pressure parameters according to the set parameters, and judges the qualification.
Has the advantages that: the invention can replace the original manual whole-process manual inflation and tracking judgment pressure difference, realize the double-path linkage air tightness detection automation, automatically judge the result, fully detect the double-path air tightness of the hard oil tank and the flexible oil tank and ensure the safety quality reliability of the two paths, further realize the air tightness detection verification and improve the automation degree and reliability of the air tightness detection, greatly reduce the manual labor intensity and improve the efficiency of the double-path air tightness detection.
Drawings
Fig. 1 is a gas tightness inspection apparatus employed in the present invention.
Detailed Description
In order to make the objects, contents and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention is provided.
The invention provides a product two-way linkage airtight automatic detection method.A adopted airtight inspection device comprises a first control proportional valve 1, a first pressure sensor 2, a second control proportional valve 3, a second pressure sensor 4 and a PLC 5; the air tightness inspection equipment is provided with two air outlets which are respectively connected with a hard oil tank 8 and a flexible oil tank 9 of a detected product, the flexible oil tank is arranged in the hard oil tank, the first control proportional valve 1 and the first pressure sensor 2 are used for controlling the first air outlet, and the second control proportional valve 3 and the second pressure sensor 4 are used for controlling the second air outlet;
the specific detection steps are as follows:
s1, setting process parameters such as airtight pressure building pressure, inflation rate, pressure maintaining time, pressure stabilizing time and two-way limit pressure difference value delta P of each stage in the PLC at the two-way airtight detection parameter setting stage according to the technical requirements of the product process, and controlling the second control proportional valve 3 and the second pressure sensor 4 to inflate the flexible oil tank 9;
s2, the PLC5 controls the second control proportional valve 3 to carry out automatic inflation pressure building, pressure maintaining and pressure stabilizing, and the second pressure sensor 4 detects the pressure value P1 of the path in real time and carries out automatic comparison and judgment with the pressure technical parameters set by the path;
s3, after the air tightness detection of the flexible oil tank air passage is finished, namely the final pressure maintaining is finished, the PLC automatically identifies the end of the air tightness of the air passage;
s4, automatically entering a hard oil tank airtightness detection process under the control of a PLC, automatically inflating and building pressure, maintaining pressure and stabilizing pressure of the hard oil tank airtightness by a first control proportional valve 1 according to the airtightness detection requirement of the hard oil tank, and automatically comparing and judging a pressure value P2 of the path with a pressure technical parameter set by the path by a first pressure sensor 2 in real time;
s5, in the airtight detection process of the hard oil tank, detecting the pressure difference delta P ' of the air passage of the hard oil tank and the flexible oil tank in real time, and automatically judging the relation between the delta P ' (P2-P1) and the delta P, wherein the delta P ' is required to be not more than the delta P;
s6, when the pressure difference delta P ' between the gas circuits of the hard oil tank and the flexible oil tank is larger than delta P in the airtight detection process, the PLC controls the hard oil tank to automatically deflate, detects the pressure P2 of the gas circuit of the hard oil tank and the pressure difference delta P ' of the gas circuit in real time, stops deflating the gas circuit of the hard oil tank when the pressure delta P ' is not larger than delta P, detects whether the pressure P2 of the gas circuit of the hard oil tank meets the set pressure parameter requirement of the gas circuit after the two-way pressure is stable, and repeats the step S4 to build pressure, stabilize pressure and maintain pressure if the pressure of the gas circuit of the hard oil tank is not larger than delta P;
s7, after the detection of the gas circuits of the hard oil tank and the flexible oil tank is finished, the PLC automatically compares the gas tightness of the gas circuit of each link of the whole process with the set pressure parameter according to the set parameter, and judges the qualification;
and S8, the air tightness of the hard oil tank and the flexible oil tank is detected to be qualified, and a double-path air tightness detection report is printed.
After two outlets of the air tightness inspection equipment are respectively connected with a product hard oil tank and a flexible oil tank interface, the PLC controls a proportional valve, a pressure sensor and the like to inflate two oil tanks of a product, two limit pressure difference values are set, the PLC automatically enters an inflation stage of the hard oil tank, the PLC identifies two pressure paths in real time in the process and automatically judges the relation between the pressure difference and the limit pressure difference values, and after the air tightness detection of the whole process is finished, the maximum limit pressure difference value in the process and the air tightness result of each path are automatically judged. The product double-path linkage airtight automatic detection process method can replace the original manual whole-process manual inflation and tracking judgment pressure difference, realize double-path linkage airtight detection automation, automatically judge the result, improve the quality reliability and safety of products, particularly flexible products, and greatly reduce the manual labor intensity and the double-path airtight detection efficiency.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (2)
1. A product two-way linkage airtight automatic detection method is characterized by comprising the following steps: the adopted air tightness checking equipment comprises a first control proportional valve 1, a first pressure sensor 2, a second control proportional valve 3, a second pressure sensor 4 and a PLC 5; the air tightness inspection equipment is provided with two air outlets which are respectively connected with a hard oil tank 8 and a flexible oil tank 9 of a detected product, the flexible oil tank is arranged in the hard oil tank, the first control proportional valve 1 and the first pressure sensor 2 are used for controlling the first air outlet, and the second control proportional valve 3 and the second pressure sensor 4 are used for controlling the second air outlet; the specific detection steps are as follows:
s1, setting airtight pressure build-up pressure, inflation rate, pressure maintaining time, pressure stabilizing time and two-way limit pressure difference value delta P of each stage in the PLC at the two-way airtight detection parameter setting stage, and controlling the second control proportional valve 3 and the second pressure sensor 4 to inflate the flexible oil tank 9;
s2, the PLC controls the second control proportional valve 3 to automatically inflate to build pressure, maintain pressure and stabilize pressure, and the second pressure sensor 4 detects the pressure value P1 of the channel in real time and automatically compares the pressure technical parameters set by the channel to judge;
s3, after the air tightness detection of the flexible oil tank air passage is finished, namely the final pressure maintaining is finished, the PLC automatically identifies the end of the air tightness of the air passage;
s4, automatically entering a hard oil tank airtightness detection process under the control of a PLC, automatically inflating and building pressure, maintaining pressure and stabilizing pressure of the hard oil tank airtightness by a first control proportional valve 1 according to the airtightness detection requirement of the hard oil tank, and automatically comparing and judging a pressure value P2 of the path with a pressure technical parameter set by the path by a first pressure sensor 2 in real time;
s5, in the airtight detection process of the hard oil tank, detecting the pressure difference delta P ' of the air passage of the hard oil tank and the flexible oil tank in real time, and automatically judging the relation between the delta P ' (P2-P1) and the delta P, wherein the delta P ' is required to be not more than the delta P;
s6, when the pressure difference delta P ' between the gas circuits of the hard oil tank and the flexible oil tank is larger than delta P in the airtight detection process, the PLC controls the hard oil tank to automatically deflate, detects the pressure P2 of the gas circuit of the hard oil tank and the pressure difference delta P ' of the gas circuit in real time, stops deflating the gas circuit of the hard oil tank when the pressure delta P ' is not larger than delta P, detects whether the pressure P2 of the gas circuit of the hard oil tank meets the set pressure parameter requirement of the gas circuit after the two-way pressure is stable, and repeats the step S4 to build pressure, stabilize pressure and maintain pressure if the pressure of the gas circuit of the hard oil tank is not larger than delta P;
and S7, after the detection of the gas circuits of the hard oil tank and the flexible oil tank is finished, the PLC automatically compares the gas tightness of the gas circuits of all links of the whole process with the set pressure parameters according to the set parameters, and judges the qualification.
2. The automatic airtight detection method with double-path linkage for the product according to claim 1, wherein: and after the airtightness of the gas circuits of the hard oil tank and the flexible oil tank is detected to be qualified, printing a double-path airtightness detection report.
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| CN202111579709.8A CN114323490B (en) | 2021-12-22 | 2021-12-22 | Automatic detection method for product double-path linkage airtight |
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| CN202111579709.8A CN114323490B (en) | 2021-12-22 | 2021-12-22 | Automatic detection method for product double-path linkage airtight |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20010037672A1 (en) * | 1994-03-11 | 2001-11-08 | Martin Lehmann | Method for testing containers, use of the method, and a testing device |
| JP2013002854A (en) * | 2011-06-14 | 2013-01-07 | Unipres Corp | Airtightness inspection method for fuel tank |
| CN106197902A (en) * | 2016-07-22 | 2016-12-07 | 华中科技大学 | A kind of air tightness detection apparatus and method of servo-controlling thereof |
| CN106323569A (en) * | 2016-08-18 | 2017-01-11 | 河北汉光重工有限责任公司 | Fuel tank airtightness detection device and test method |
| US20180024026A1 (en) * | 2015-03-03 | 2018-01-25 | Emd Millipore Corporation | System And Method For Integrity Testing Of Flexible Containers |
| CN109540421A (en) * | 2017-09-21 | 2019-03-29 | 青海时代新能源科技有限公司 | Air tightness detection device and method |
-
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- 2021-12-22 CN CN202111579709.8A patent/CN114323490B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20010037672A1 (en) * | 1994-03-11 | 2001-11-08 | Martin Lehmann | Method for testing containers, use of the method, and a testing device |
| JP2013002854A (en) * | 2011-06-14 | 2013-01-07 | Unipres Corp | Airtightness inspection method for fuel tank |
| US20180024026A1 (en) * | 2015-03-03 | 2018-01-25 | Emd Millipore Corporation | System And Method For Integrity Testing Of Flexible Containers |
| CN106197902A (en) * | 2016-07-22 | 2016-12-07 | 华中科技大学 | A kind of air tightness detection apparatus and method of servo-controlling thereof |
| CN106323569A (en) * | 2016-08-18 | 2017-01-11 | 河北汉光重工有限责任公司 | Fuel tank airtightness detection device and test method |
| CN109540421A (en) * | 2017-09-21 | 2019-03-29 | 青海时代新能源科技有限公司 | Air tightness detection device and method |
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