CN114623981A - Static and dynamic sealing test method based on machine vision - Google Patents
Static and dynamic sealing test method based on machine vision Download PDFInfo
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- CN114623981A CN114623981A CN202210286328.9A CN202210286328A CN114623981A CN 114623981 A CN114623981 A CN 114623981A CN 202210286328 A CN202210286328 A CN 202210286328A CN 114623981 A CN114623981 A CN 114623981A
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- 238000007789 sealing Methods 0.000 title claims abstract description 37
- 230000003068 static effect Effects 0.000 title claims abstract description 31
- 238000010998 test method Methods 0.000 title claims abstract description 11
- 238000012360 testing method Methods 0.000 claims abstract description 68
- 238000001514 detection method Methods 0.000 claims abstract description 44
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 31
- 238000012545 processing Methods 0.000 claims abstract description 12
- 230000010349 pulsation Effects 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims description 14
- 238000005286 illumination Methods 0.000 claims description 8
- 238000011056 performance test Methods 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 15
- 238000004445 quantitative analysis Methods 0.000 abstract description 3
- 238000004458 analytical method Methods 0.000 abstract description 2
- 230000005587 bubbling Effects 0.000 abstract description 2
- 230000007547 defect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 230000000007 visual effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000035485 pulse pressure Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/06—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing bubbles in a liquid pool
- G01M3/08—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing bubbles in a liquid pool for pipes, cables or tubes; for pipe joints or seals; for valves; for welds
- G01M3/085—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing bubbles in a liquid pool for pipes, cables or tubes; for pipe joints or seals; for valves; for welds for pipe joints or seals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/06—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing bubbles in a liquid pool
- G01M3/08—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing bubbles in a liquid pool for pipes, cables or tubes; for pipe joints or seals; for valves; for welds
- G01M3/086—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing bubbles in a liquid pool for pipes, cables or tubes; for pipe joints or seals; for valves; for welds for valves
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Abstract
The invention discloses a static and dynamic sealing test method based on machine vision, which combines a traditional water detection method and machine vision to test the sealing performance of an inflating nozzle. The machine vision algorithm operation detection host in the vision system is used for converting the certain phenomenon of bubbling in water into quantitative analysis which can be represented by numerical values by using an image processing detection analysis algorithm, so that the defects of the traditional method for detecting bubbles in water by using the inflating nozzle are overcome. The invention comprises a tightness test loop and a vision system, wherein the tightness test loop comprises an inflation test loop, a pulsation inflation loop and an evacuation loop. The inflation test loop is used for inflation test of the sealing test, the pulsation inflation loop is used for dynamic sealing test, and the emptying loop is used for emptying the pipeline in the test process. The problem that the traditional water detection method is greatly influenced by subjective factors and low in fault tolerance rate is solved.
Description
Technical Field
The invention relates to the field of testing of sealing performance of aerospace charging connectors, in particular to a static and dynamic sealing testing method based on machine vision.
Background
When the inflation equipment uses the inflation nozzle to inflate, the principle is that the use is convenient and swift, and use the inflation nozzle in essence and enable the air current more concentrated, it is difficult for outwards revealing gas, reduced time and money cost.
The prior art mainly has a water detection method for carrying out sealing test on the charging connector: the water detection method is mainly characterized in that whether bubbles are generated in a sample in water or not is observed through a test method of charging and discharging air to a test piece. This method has the following disadvantages: the personnel observation is easy to fatigue and make mistakes; some problems such as water residue and easy corrosion exist after the material quality of the charging connector is detected.
Disclosure of Invention
In view of the above problems, the main object of the present invention is to provide a static and dynamic seal testing method based on machine vision, which combines machine vision with water detection: the simple and easy water detection method is combined with the modern optical and image processing technology, and the problems that the single water detection method of the inflating nozzle is greatly influenced by subjective factors and the fault tolerance rate is low are solved.
In order to achieve the aim, the static and dynamic sealing test method based on machine vision comprises a sealing test loop and a vision system.
The tightness test loop comprises an inflation test loop, a pulsation inflation loop, an emptying loop, an air source assembly (1), a plurality of safety relief valves and electromagnetic valves, a pressure sensor assembly and an inflation cavity (12):
the sealing performance test loop is double-station, can test two charging connectors at the same time, and can test static sealing performance and dynamic sealing performance;
a 2-level filter (2) is arranged at the air source inlet for filtering;
the inflation test loop consists of a solenoid valve V1 (4), a solenoid valve V2 (7), a solenoid valve V3 (8), a solenoid valve V4 (9) and a solenoid valve V5 (6), is used for carrying out static tightness test on the inflation nozzle, and is provided with a safety relief valve AJ1 (3) at the front end to ensure that the pressure is too high for protection;
the pulsation inflation circuit consists of a solenoid valve V6 (15), a solenoid valve V7 (16) and a solenoid valve V8 (14) and is used for performing pulsation and durable sealing tests on the inflation nozzle, wherein the solenoid valve V6 (15) and the solenoid valve V7 (16) perform inflation at different pressures, and a safety relief valve AJ3 (17) and an AJ2 (18) are arranged at the front end to ensure that the pressure is too high for protection;
the evacuation loop consists of electromagnetic valves V8 (14) and V5 (6), and evacuates a pipeline in the test process;
the electromagnetic valves are all direct-acting normally closed electromagnetic valves;
the gas source assembly (1) is used for providing a stable gas source for the tightness test loop;
the pressure sensor assembly PS1 (10), PS2 (13) for monitoring the inflation pressure in the circuit;
the inflation cavity (12) is a fixed volume tank for receiving gas from a gas source and delivering the gas to the inflation nozzle.
Furthermore, the valve ends of the electromagnetic valve V2 (7) and the electromagnetic valve V4 (9) are connected into the water tank (11) (the water tank (11) is filled with special leak detection liquid, the two sides of the water tank are made of opaque materials, so that a light source is more concentrated, the observability of leak detection liquid bubbles is improved by controlling the drift diameter and the liquid level depth of the liquid internal conduit (21), and the quick identification and judgment of the leak detection bubbles are ensured by vision;
during the static tightness test, the product is first aerated: the method comprises the steps that a solenoid valve V3 (8) is connected to an air source inlet (23), a solenoid valve V4 (9), a solenoid valve V2 (7) and a solenoid valve V5 (6) are closed, a solenoid valve V1 (4) and a solenoid valve V3 (8) are opened, meanwhile, a pressure sensor PS1 (10) monitors inflation pressure, after inflation time is up, the solenoid valve V1 (4) is closed firstly, then the solenoid valve V3 (8) and the solenoid valve V5 (6) are opened, pipeline evacuation is conducted through an exhaust valve V9 (5), then the solenoid valve V5 (6) is closed, a solenoid valve V2 (7) and a solenoid valve V4 (9) are opened, leakage of a one-way outlet is detected through visual detection, and evacuation is conducted after detection is completed;
in the dynamic seal test process, the product is first inflated: the method comprises the steps that a solenoid valve V4 (9), a solenoid valve V2 (6) and a solenoid valve V8 (14) are closed, a solenoid valve V6 (15) or a solenoid valve V7 (16) are opened, meanwhile, a pressure sensor PS2 (13) monitors inflation pressure, after inflation time is up, the solenoid valve V6 (15) or the solenoid valve V7 (16) is closed, the solenoid valve V8 (14) is opened, pipeline evacuation is conducted through an exhaust valve V9 (5), then the solenoid valve V8 (14) is closed, a solenoid valve V2 (7) and a solenoid valve V4 (9) are opened, the solenoid valve V6 (15) or the solenoid valve V7 (16) is opened for pulse pressure conveying, leakage of a one-way outlet is detected, visual detection is carried out, evacuation is completed, and the solenoid valve V6 (15) or the solenoid valve V7 (16) is closed.
The vision system comprises the following parts: the industrial lens is used for acquiring a sharp image in the water tank and highlighting useful details when bubbles are generated; the industrial camera (19) converts the acquired optical signal into an electric signal and transmits the electric signal to the operation detection host; the illumination part is convenient for the lens to obtain a high-contrast image when bubbles are generated, and the workload of a later algorithm operation detection host is reduced; the machine vision algorithm operation detection host is used for processing the pictures and returning the result to the experimenter;
furthermore, the industrial camera (19) is a CMOS type camera, and is suitable for occasions with high imaging speed; the illumination part adopts a standard annular machine vision light source (22) and adopts back illumination, the water tank (20) is arranged between the camera and the annular light source (22) to highlight the shadow of the bubble of the leakage detection liquid, so that the bubble outline is clearly outlined and the external light can be effectively shielded; the machine vision algorithm operation detection host is an industrial touch screen all-in-one machine, and an image processing technology is used as a method on the basis of machine vision; the industrial personal computer triggers the industrial camera (19) to take a picture and transmits the picture to the internal memory for processing, and after the sealing performance test is finished, the detection result is returned to the experimenter, so that the sealing performance test of the inflating nozzle is finished.
The invention relates to a static and dynamic seal test method based on machine vision, which comprises the following steps: the machine vision algorithm operation detection host converts the certain phenomenon of bubbling in water into quantitative analysis which can be represented by numerical values by using an image processing detection analysis algorithm, overcomes the defects of the traditional method for detecting bubbles in water by using the inflating nozzle, has low fault-tolerant rate and is greatly influenced by subjective factors, and reduces time and economic cost.
Drawings
FIG. 1 is a testing flow chart of the static and dynamic sealing testing method based on machine vision according to the present invention;
FIG. 2 is a schematic diagram of a tightness testing loop of the static and dynamic tightness testing method based on machine vision according to the present invention;
FIG. 3 is a diagram of a vision system distribution based on a machine vision static and dynamic seal testing method according to the present invention;
FIG. 4 is a schematic venting diagram of a machine vision based static and dynamic seal testing method of the present invention;
fig. 5 is a schematic diagram of a test installation of the static and dynamic seal testing method based on machine vision according to the invention.
Reference numerals: the device comprises an air source processing assembly (1), a 2-level filter (2), a safety relief valve AJ1 (3), a solenoid valve V1 (4), an exhaust valve V9 (5), a solenoid valve V5 (6), a solenoid valve V2 (7), a solenoid valve V3 (8), a solenoid valve V4 (9), a pressure sensor PS1 (10), a water tank (11), an inflation cavity (12), a pressure sensor PS2 (13), a solenoid valve V8 (14), a solenoid valve V6 (15), a solenoid valve V7 (16), a safety relief valve AJ3 (17), a safety relief valve AJ2 (18), an industrial camera (19), a water tank (20), a conduit (21), an annular light source (22), an air source inlet (23), a valve mechanism (24), a one-way outlet (25), a clamping sleeve (26), an inflation inlet (27), an inflation nozzle (28), an inflation cavity I chamber (1201) and an inflation cavity II chamber (1202).
Detailed Description
The static and dynamic seal testing method based on machine vision according to the present invention is further described in detail with reference to the accompanying drawings and the detailed description.
The static and dynamic sealing test method based on machine vision comprises a sealing test loop and a vision system.
The tightness test loop comprises an inflation test loop, a pulsation inflation loop, an emptying loop, an air source assembly (1), a plurality of safety relief valves, electromagnetic valves, a pressure sensor assembly and an inflation cavity (12):
the sealing performance test loop is double-station, can test two charging connectors at the same time, and can test static sealing performance and dynamic sealing performance;
a 2-level filter (2) is arranged at the air source inlet for filtering;
the inflation test loop consists of a solenoid valve V1 (4), a solenoid valve V2 (7), a solenoid valve V3 (8), a solenoid valve V4 (9) and a solenoid valve V5 (6), is used for carrying out static sealing test on the inflation nozzle, and is provided with a safety relief valve AJ1 (3) at the front end to ensure that the pressure is too high for protection;
the pulsation inflation circuit consists of a solenoid valve V6 (15), a solenoid valve V7 (16) and a solenoid valve V8 (14) and is used for performing pulsation and durable sealing tests on the inflation nozzle, wherein the solenoid valve V6 (15) and the solenoid valve V7 (16) perform inflation at different pressures, and a safety relief valve AJ3 (17) and an AJ2 (18) are arranged at the front end to ensure that the pressure is too high for protection;
the evacuation loop consists of electromagnetic valves V8 (14) and V5 (6), and evacuates a pipeline in the test process;
the electromagnetic valves are all direct-acting normally closed electromagnetic valves;
the gas source assembly (1) is used for providing a stable gas source for the tightness test loop;
the pressure sensor assembly PS1 (10), PS2 (13) for monitoring the inflation pressure in the circuit;
the inflation cavity (12) is a fixed volume tank for receiving gas from a gas source and delivering the gas to the inflation nozzle.
Furthermore, the valve ends of the electromagnetic valve V2 (7) and the electromagnetic valve V4 (9) are connected into the water tank (11) (the water tank (11) is filled with special leak detection liquid, the two sides of the water tank are made of opaque materials, so that a light source is more concentrated, the observability of leak detection liquid bubbles is improved by controlling the drift diameter and the liquid level depth of the liquid internal conduit (21), and the quick identification and judgment of the leak detection bubbles are ensured by vision;
in the static seal test, the product is first aerated: the method comprises the steps that a solenoid valve V3 (8) is connected to an air source inlet (23), a solenoid valve V4 (9), a solenoid valve V2 (7) and a solenoid valve V5 (6) are closed, a solenoid valve V1 (4) and a solenoid valve V3 (8) are opened, meanwhile, a pressure sensor PS1 (10) monitors inflation pressure, after inflation time is up, the solenoid valve V1 (4) is closed, then the solenoid valve V3 (8) and the solenoid valve V5 (6) are opened, pipeline evacuation is carried out through an exhaust valve V9 (5), then the solenoid valve V5 (6) is closed, a solenoid valve V2 (7) and the solenoid valve V4 (9) are opened, leakage of a one-way outlet is detected through visual detection, and evacuation is carried out after detection is finished;
in the dynamic seal test process, the product is first inflated: the method comprises the steps that a solenoid valve V4 (9), a solenoid valve V2 (6) and a solenoid valve V8 (14) are closed, a solenoid valve V6 (15) or a solenoid valve V7 (16) are opened, meanwhile, a pressure sensor PS2 (13) monitors inflation pressure, after inflation time is up, the solenoid valve V6 (15) or the solenoid valve V7 (16) is closed, the solenoid valve V8 (14) is opened, pipeline evacuation is conducted through an exhaust valve V9 (5), then the solenoid valve V8 (14) is closed, a solenoid valve V2 (7) and a solenoid valve V4 (9) are opened, the solenoid valve V6 (15) or the solenoid valve V7 (16) is opened for pulse pressure conveying, leakage of a one-way outlet is detected, visual detection is carried out, evacuation is completed, and the solenoid valve V6 (15) or the solenoid valve V7 (16) is closed.
The vision system comprises the following parts: the industrial lens is used for acquiring a sharp image in the water tank and highlighting useful details when bubbles are generated; the industrial camera (19) converts the acquired optical signal into an electric signal and transmits the electric signal to the operation detection host; the illumination part is convenient for the lens to obtain a high-contrast image when bubbles are generated, and the workload of a later algorithm operation detection host is reduced; the machine vision algorithm operation detection host is used for processing the pictures and returning the result to the experimenter;
furthermore, the industrial camera (19) is a CMOS type camera, and is suitable for occasions with high imaging speed; the illumination part adopts a standard annular light source (22) and adopts back illumination, the water tank (20) is arranged between the camera and the light source, the shadow of the bubble of the leakage detection liquid is highlighted, the outline of the bubble is clearly outlined, and the external light can be effectively shielded; the machine vision algorithm operation detection host is an industrial touch screen all-in-one machine, and an image processing technology is used as a method on the basis of machine vision; the industrial personal computer triggers the camera to take a picture and transmits the picture to the memory for processing, and after the tightness test is finished, the detection result is returned to the experimenter, so that the tightness test of the test piece is finished.
Further, the flow for realizing the detection of the air inflation sealing performance based on the machine vision static and dynamic sealing test method of the invention is as follows:
1. stage of installation
Arranging a water tank (20) on a line of an industrial camera (19) and an annular light source (22); inserting an inflating opening (27) into an inflating nozzle (28), and sealing the inflating nozzle by using a clamping sleeve (26); the valve mechanism (24) is closed, and the valve of the valve mechanism (24) is closed at the moment, so that all gas sources can smoothly reach the inflation cavity (12) during inflation.
2. Stage of inflation
2.1, performing static sealing test on the inflating nozzle, and inflating by adopting the following steps: the solenoid valve V3 (8) is connected to the air source inlet (23), the solenoid valve V4 (9), the solenoid valve V2 (7) and the solenoid valve V5 (6) are closed, the solenoid valve V1 (4) and the solenoid valve V3 (8) are opened, electromagnetic force is generated by the solenoid coil of the solenoid valve to push the valve body open, the valve is opened, air output by the air source flows through the valve to inflate the first chamber 1201 of the inflation cavity, meanwhile, the pressure sensor PS1 (10) monitors inflation pressure, after inflation time is up, the solenoid valve V1 (4) is closed first, the valve body of the solenoid valve blocks the valve at the time, and the valve is closed; then opening a solenoid valve V3 (8) and a solenoid valve V5 (6), and exhausting the gas in the pipeline through a valve by an exhaust valve V9 (5);
2.2, carrying out dynamic tightness test on the inflating nozzle, and inflating by adopting the following steps: the electromagnetic valve V4 (9), the electromagnetic valve V2 (6) and the electromagnetic valve V8 (14) are closed, the electromagnetic valve V6 (15) or the electromagnetic valve V7 (16) are opened, at the moment, the electromagnetic coil of the electromagnetic valve generates electromagnetic force to push the valve body open, the valve is opened, gas output by the gas source flows through the valve to inflate the chamber II (1202) of the inflation cavity, meanwhile, the pressure sensor PS2 (13) monitors inflation pressure, after the inflation time is up, the electromagnetic valve V6 (15) or the electromagnetic valve V7 (16) is closed, at the moment, the valve body of the electromagnetic valve blocks the valve, and the valve is closed; opening the electromagnetic valve V8 (14), and exhausting the gas in the pipeline through the exhaust valve V9 (5); then, the solenoid valve V6 (15) or the solenoid valve V7 (16) is opened for pulsating pressure delivery, and is closed after completion of the detection.
3. Exhaust stage
The solenoid valve V2 (7) or the solenoid valve V4 (9) is connected to the one-way outlet (25) and is connected with a conduit (21) in the water tank; opening the electromagnetic valve V2 (7) or the electromagnetic valve V4 (9), and rotating to open the valve mechanism (24), wherein the valve of the valve mechanism (24) is opened, and the valve of the exhaust loop is opened; if a static seal test is performed, the valve mechanism (24) is manually moved upward to exhaust air through the valve.
4. Detection phase
The industrial personal computer triggers the industrial camera (19) to take a picture and transmits the picture to the internal memory for processing, and whether bubbles are generated in the water tank (20) is detected; after the sealing test is finished, the detection result is returned to an experiment or a worker in a quantitative analysis mode, the sealing test of the inflating nozzle is finished, and the pipeline needs to be emptied after the detection is finished.
The above embodiments are further described in detail with reference to the method for testing static and dynamic seal based on machine vision, and it should be understood that the above embodiments are only exemplary embodiments of the present invention and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (4)
1. Static and dynamic sealing test method based on machine vision is characterized in that a sealing test loop comprises an inflation test loop, a pulsation inflation loop and an evacuation loop:
the inflation test loop is used for carrying out static tightness test on the inflation nozzle;
the pulsating inflation circuit is used for carrying out dynamic sealing test on the inflation nozzle;
the evacuation circuit is used for evacuating the pipeline.
2. The machine vision based static and dynamic seal testing method according to claim 1, characterized by comprising the following parts:
the tightness testing loop is a double-station loop, can simultaneously test two charging connectors, and can perform static tightness testing and dynamic tightness testing, wherein the dynamic tightness testing has two pulsating pressures;
the tightness testing loop is provided with a 2-level filter (2) at an air source inlet for filtering and a safety pressure relief valve assembly at a pipeline, so that the safety protection of overhigh pressure is ensured.
3. The static and dynamic seal test method based on machine vision as claimed in claim 1, characterized in that the valve ends of the electromagnetic valve V2 (7) and the electromagnetic valve V4 (9) are connected into the water tank (11) (the water tank (11) is a special leak detection liquid), and the visibility of leak detection liquid bubbles is improved by controlling the drift diameter and the liquid level depth of the liquid internal conduit (21), so that the quick identification and judgment of leak bubbles can be carried out visually.
4. The static and dynamic sealing test method based on machine vision is characterized in that a vision system comprises the following parts: the industrial camera (19) is a CMOS type camera; the illumination part adopts a standard annular light source (22) and adopts back illumination; the water tank (20) is in the middle of the line of the industrial camera (19) and the annular light source (22); the operation detection host is an industrial touch screen all-in-one machine, and the industrial personal computer triggers an industrial camera (19) to take a picture and transmits the picture to the internal memory for processing; and after the sealing performance test is finished, returning the detection result to an experimenter to finish the static and dynamic sealing performance test of the inflating nozzle.
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Application publication date: 20220614 |