CN109520678A - A kind of pressure maintaining detection method for pressure vessel air tightness test - Google Patents
A kind of pressure maintaining detection method for pressure vessel air tightness test Download PDFInfo
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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
- G01M3/10—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 containers, e.g. radiators
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/0002—Inspection of images, e.g. flaw detection
- G06T7/0004—Industrial image inspection
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/10—Segmentation; Edge detection
- G06T7/13—Edge detection
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/10—Segmentation; Edge detection
- G06T7/136—Segmentation; Edge detection involving thresholding
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/10—Image acquisition modality
- G06T2207/10016—Video; Image sequence
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- Computer Vision & Pattern Recognition (AREA)
- Theoretical Computer Science (AREA)
- Quality & Reliability (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The invention proposes a kind of pressure maintaining detection methods for pressure vessel air tightness test, it can automatically detect out the pressure vessel and quantity in detection cell, there are when pressure vessel in detection cell, pressure vessel internal pressure numerical value is got by pressure sensor, whether the dwell pressure and dwell time for further calculating pressure vessel according to pressure value variation reach rated value, avoid " Asia inspection " situation in air-leakage test.
Description
Technical field
The present invention relates to industrial air-leakage test fields, and in particular to a kind of pressure maintaining for pressure vessel air tightness test
Detection method.
Background technique
Pressure vessel is usually used in storing compressed liquid or gas in the industry.It needs to be filled with high pressure gas for this
Or for the pressure vessel of liquid, if leaked in use, it will cause security risk, can also cause when serious
The hazard events such as fire, explosion.Currently, most manufacturers carry out air-leakage test to pressure vessel using bowssening.Immersion
Method is that pressure vessel to be detected is put into air-leakage test pond, then to gas is filled with inside pressure vessel to be detected, is made
It obtains pressure vessel air pressure inside and reaches examination criteria, judge pressure vessel by whether thering is bubble to come up in observation detection cell
Air-tightness.Clear stipulaties in the standard GB12137-89 gas cylinder airtightness testing method of Issued by China State Bureau of Technical Supervision: it is testing
In the process, the relationships the such as whether time is enough when whether pressure is added to position, protects, whether every pressure vessel normally tests before dispatching from the factory
To its enter market after using safe.And in artificial implementation process, part producing producer in order to improve the production efficiency, in gas
In close property detection process, testing staff makes the duration deficiency of insufficient pressure or on-load pressure that pressure vessel inside loads
It is happened at " Asia inspection ".
For the detection of pressure condition in air-tight test, domestic and international experts and scholars expand primary study.Wherein and originally
Inventing the technical solution being closer to includes: (the Temperature compensation in such as Anthony Jenkins
differential pressure leak detection[P].United States Patent:4947352,1990-08-
07) it in order to improve differential pressure method detection accuracy, proposes a scale factor, is determined according to multiple measurement, to reduce pressure differential method inspection
Survey bring error.(the Leak detection system with background such as Sarkis Barkhoudarian
Compensation [P] .United States Patent:5001346,1991-03-19) it proposes measured piece and standard component
It is maintained in a relative constant environment, reduces influence of the airtight container external heat transfer to pressure differential method detection accuracy.
(the Analysis of temperature effect on differential pressure such as Kenji Kawashima
method for air leak detection[A].SICE 2004Annual Conference [C].Oakland:IEEE
Computer Press, 2004:159-162) et al. on the basis of pressure differential method air-leakage test, study testing container and reference
Container internal temperature in gas replenishment process changes, and proposes that pressure vessel thermal recovery time is the weight for influencing pressure differential method detection accuracy
Want reason.(the Dynamical Model of Leak Measurement by PneumaticPressure such as Harus L G
Change [M] .Japan:Systems Modeling and Simulation, 2007) temperature is had studied to detect differential pressure method
Influence, propose the relational model of ambient temperature Yu differential pressure method detection accuracy.Chen Yu etc. (differential pressure air-leakage detector design with
Realize [J] China Measures Institute journal, 2009,20 (4): 311-314) the air-leakage test instrument based on differential pressure method is had developed,
By circuit control inflation/deflation process, human-computer interaction is improved using touch screen module, configures high-precision pressure sensor to improve
Detection accuracy.Mu Xiaoge etc. (design [J] instrument and meter for automation of steel cylinder inspection data automatic collecting system, 2011,32 (4):
Steel cylinder inspection data automatic collecting system 56-58) etc. is developed, is mainly used for acquiring in real time and examines the data such as pressure, temperature.
Luo Jianming etc. (research [J] of the air-leakage detector calibrating installation based on PLC measures technology, 2015,25 (1): 94-95) etc.
It is studied for differential pressure method, devises the air-tightness calibrating installation based on PLC, improve the precision of differential pressure method measurement.Liu
Great equal (based on external pressure pressure differential method high pressure valve air tightness detection system research [J] lathe and hydraulic, 2015,43 (1): 53-56)
External pressure pressure is based on by the defect of cylinder valve and gas-guide tube gas leakage effect in detection accuracy for direct pressure closing and internal pressure pressure differential method
Poor method proposes a set of detection scheme for cylinder valve air-tightness.Experiment shows that the program improves to a certain extent
Detection accuracy accelerates detection speed, and has good system stability.(the floating based on equivalent differential pressure method such as Zeng Fanyang
Device leakage detection method studies [J] HeFei University of Technology journal (natural science edition), 2018,41 (04): 451-456) it proposes
The leakage detection method of aerostatics carries out mathematical modeling in different temperatures and pressure difference running parameter to aerostatics, utilizes a large amount of numbers
According to being verified and being corrected to simulation model, enable model essence after measurement the aerostatics for a period of time variation of interior temperature and pressure difference
Really calculate the leakage rate of aerostatics.
In conclusion the air-tight test scheme that comparison is proposed at present, main problem is that: most scheme the point concerned
Be how leakage pressure container detected by the methods of pressure differential method, in fact no matter pressure vessel gas leakage to be checked whether,
During air-leakage test, will ensure whether pressure vessel dwell pressure and dwell time are up to standard, ignore pressure vessel pressure maintaining
Pressure and dwell time will have a direct impact on last air-leakage test result.
Summary of the invention
Aiming at the problems existing in the prior art, the purpose of the present invention is to provide one kind tries for pressure vessel air tightness
The pressure maintaining detection method tested, by whether there is pressure vessel in dual threshold binaryzation and Canny rim detection test detection cell,
As the guarantor for there are when pressure vessel, passing through pressure sensor in detection cell and obtaining in a period of time pressure vessel to be checked in detection cell
Pressure pressure value judges whether pressure vessel internal pressure is added to position, dwell time enough, it is ensured that air-leakage test it is reliable
Property.
Technical scheme is as follows:
A kind of pressure maintaining detection method for pressure vessel air tightness test, which comprises the steps of:
Step 1: air-tight test detection cell being shot with industrial camera, video frame images are obtained from video camera
fi, i=1,2 ..., n, gray processing fiObtain gray level image gfi, with the interior verification grayscale image gf of 3*3iUsing double after progress noise reduction
Threshold binarization method, two threshold value t of setting height1And t2, then according to formula (1) to gfiBinaryzation obtains bianry image
bfi；
In formula, f (x, y) indicates pixel gray value, threshold value t1And t2It is determined by grey level histogram valley value；
Step 2: to bianry image bfiIts edge image ef is obtained using Canny operatoriWith edge collection Indicate edgesiIn j-th strip side
Edge, miIndicate edgesiThe quantity at middle edge,Indicate edgeIn k-th of pixel,It indicatesIt is corresponding
Coordinate,It indicatesIn pixel sum；
Step 3: calculatingCorresponding closed contour area, is denoted asIfWithMeet formula (2), then by edgeIt is added in pressure vessel edge collection bottleedges；When all satisfactory edgesAll it is added to pressure vessel side
When edge collection bottleEdges, it is denoted as bottleEdges={ ebv| v=1,2 ..., u }, ebvIndicate that corresponding pressure is held
Device edge contour, then u is the quantity of detection cell inner pressure vessel；
Step 4: when u is not 0, i.e., there are pressure vessel in sink, pressure sensor starts returning pressure ginseng
Number；Assuming that u is not 0 in r batch air-tight test, the pressure vessel internal pressure arrangement set of pressure sensor measurement isWhereinFor pressure value,ForCorresponding acquisition time, R are acquisition
Number；If formula (3) is met, then it represents that the dwell time of the batch air-tight test and dwell pressure are abundant, air-tightness examination
Test it is reliable, it is on the contrary then test it is unreliable；
Wherein, P0Indicate specified dwell pressure value, T0Indicate the minimum dwell time required by air-tight test, δ indicates to protect
Pressure pressure error threshold,Indicate that pressurization stages pressure value is equal to P in set P0Corresponding acquisition time, is denoted as s when/2
Secondary acquisition,Indicate that decompression phase pressure value is equal to P in set P0Corresponding acquisition time when/2 is denoted as the e times acquisition.
The beneficial effects of the present invention are: the present invention can automatically detect out pressure vessel and quantity in detection cell,
There are when pressure vessel in detection cell, pressure vessel internal pressure numerical value is got by pressure sensor, further according to pressure
Whether the dwell pressure and dwell time that force value variation calculates pressure vessel reach rated value, avoid in air-leakage test
" Asia inspection " situation.
Detailed description of the invention
Fig. 1 is pressure sensor and camera installation site example diagram；
Fig. 2 is to air-tight test grayscale image；
Fig. 3 is the result that dual threshold binaryzation is carried out to air-tight test image；
Fig. 4 is to air tight test pressure curve example diagram.
Specific embodiment
The present invention is elaborated below with reference to example and picture.
A kind of pressure maintaining detection method for pressure vessel air tightness test, the specific steps are as follows:
Step 1: equipment installation is as shown in Figure 1, wherein 1 expression air pump, 2 expression pressure sensors, and 3 expression video cameras, 4
Indicate pressure vessel, 5 indicate detection cell, and 6 indicate gas-guide tube；Air-tight test detection cell is shot with industrial camera,
Video frame images f is obtained from video camerai, i=1,2 ..., n, gray processing fiObtain gray level image gfi, grayscale image gfiSuch as Fig. 2
It is shown, with the interior verification grayscale image gf of 3*3iDual threshold binarization method, two threshold value t of setting height are used after carrying out noise reduction1With
t2, then according to formula (1) to gfiBinaryzation obtains bianry image bfi, bianry image bfiAs shown in Figure 3；
In formula, f (x, y) indicates pixel gray value, threshold value t1And t2It is determined by grey level histogram valley value, in this example
Middle t1And t2Take 35 and 50；
Step 2: to binary map bfiIts edge image ef is obtained using Canny operatoriWith edge collection Indicate edgesiIn j-th strip
Edge, miIndicate edgesiThe quantity at middle edge,Indicate edgeIn k-th of pixel,It indicatesIt is right
The coordinate answered,It indicatesIn pixel sum；
Step 3: calculatingCorresponding closed contour area, is denoted asIfWithMeet formula (2), then by edgeIt is added in pressure vessel edge collection bottleedges；When all satisfactory edgesAll it is added to pressure vessel side
When edge collection bottleEdges, it is denoted as bottleEdges={ ebv| v=1,2 ..., u }, ebvIndicate that corresponding pressure is held
Device edge contour, then u is the quantity of detection cell inner pressure vessel；
Step 4: when u is not 0, i.e., there are pressure vessel in sink, pressure sensor starts returning pressure ginseng
Number；Assuming that u is not 0 in r batch air-tight test, the pressure vessel internal pressure arrangement set of pressure sensor measurement isWherein Pi (r)For pressure value,For Pi (r)Corresponding acquisition time, R are acquisition
Number；If formula (3) is met, then it represents that the dwell time of the batch air-tight test and dwell pressure are abundant, air-tightness examination
Test reliable, on the contrary then test unreliable, pressue-graph is as shown in Figure 4；
Wherein, P0Indicate specified dwell pressure value, T0Indicate the minimum dwell time required by air-tight test, δ indicates to protect
Pressure pressure error threshold,Indicate that pressurization stages pressure value is equal to P in set P0Corresponding acquisition time, is denoted as s when/2
Secondary acquisition,Indicate that decompression phase pressure value is equal to P in set P0Corresponding acquisition time when/2 is denoted as the e times acquisition,
In this example, P0、T030Mpa, 60s and 0.05 are taken respectively with the value of δ.
Claims (1)
1. a kind of pressure maintaining detection method for pressure vessel air tightness test, which comprises the steps of:
Step 1: air-tight test detection cell being shot with industrial camera, video frame images f is obtained from video camerai, i
=1,2 ..., n, gray processing fiObtain gray level image gfi, with the interior verification grayscale image gf of 3*3iDual threshold is used after carrying out noise reduction
Binarization method, two threshold value t of setting height1And t2, then according to formula (1) to gfiBinaryzation obtains bianry image bfi；
In formula, f (x, y) indicates pixel gray value, threshold value t1And t2It is determined by grey level histogram valley value；
Step 2: to bianry image bfiIts edge image ef is obtained using Canny operatoriWith edge collection Indicate edgesiIn j-th strip side
Edge, miIndicate edgesiThe quantity at middle edge,Indicate edgeIn k-th of pixel,It indicatesIt is corresponding
Coordinate,It indicatesIn pixel sum；
Step 3: calculatingCorresponding closed contour area, is denoted asIfWithMeet formula (2), then by edgeAdd
It is added in pressure vessel edge collection bottleedges；When all satisfactory edgesAll it is added to pressure vessel edge collection
When bottleEdges, it is denoted as bottleEdges={ ebv| v=1,2 ..., u }, ebvIndicate corresponding pressure vessel side
Edge profile, then u is the quantity of detection cell inner pressure vessel；
Step 4: when u is not 0, i.e., there are pressure vessel in sink, pressure sensor starts returning pressure parameter；It is false
If in r batch air-tight test, u is not 0, the pressure vessel internal pressure arrangement set of pressure sensor measurement isWherein Pi (r)For pressure value,For Pi (r)Corresponding acquisition time, R are acquisition
Number；If formula (3) is met, then it represents that the dwell time of the batch air-tight test and dwell pressure are abundant, air-tightness examination
Test it is reliable, it is on the contrary then test it is unreliable；
Wherein, P0Indicate specified dwell pressure value, T0Indicate the minimum dwell time required by air-tight test, δ indicates pressure maintaining pressure
Power error threshold,Indicate that pressurization stages pressure value is equal to P in set P0It corresponding acquisition time when/2, is denoted as the s times and adopts
Collection,Indicate that decompression phase pressure value is equal to P in set P0Corresponding acquisition time when/2 is denoted as the e times acquisition.
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| CN114235308A (en) * | 2021-12-09 | 2022-03-25 | 武汉欧格莱液压动力设备有限公司 | Method for testing sealing performance of hydraulic element |
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