CN101881700A - Gas cylinder tester with digital image analysis external measuring method - Google Patents
Gas cylinder tester with digital image analysis external measuring method Download PDFInfo
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- CN101881700A CN101881700A CN2009100507072A CN200910050707A CN101881700A CN 101881700 A CN101881700 A CN 101881700A CN 2009100507072 A CN2009100507072 A CN 2009100507072A CN 200910050707 A CN200910050707 A CN 200910050707A CN 101881700 A CN101881700 A CN 101881700A
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Abstract
The invention provides a gas cylinder tester with a digital image analysis external measuring method, belonging to the technical field for measuring the quality of a gas cylinder. The gas cylinder tester is formed by the connection and the assembly of a digital camera shooting part, an image analysis software part, a pressure measuring part, an electric control part and a microcomputer tracking part. The gas cylinder tester is technically characterized in that the volume change of the gas cylinder caused by the pressure is measured by means of an image method, and the measurement method is dry measurement and is free of contact. The image of the gas cylinder is processed with the image processing method such as image denoising, fitting, edge measuring and the like; and the deformation quantity is computed with the three-dimensional simulating and modeling of a procedure, i.e. the full deformation quantity and the residual deformation quantity of the gas cylinder, and the residual deformation rate is computed. The gas cylinder tester solves the problem that the other external measuring method is easily influenced by the external condition, breaks through the influence and the restriction of the conventional weighing external measuring method and the correlative gas cylinder water pressure tester to the development of the industry of the gas cylinder to some extent, improves the test precision, leads the test operation to be convenient and a result to be visual, and is ideal equipment for the gas cylinder to perform the external measuring water pressure test.
Description
Technical field
Gas cylinder belongs to the transportable pressure vessel that uses in the international coverage, and its use amount is wide, scope is wide, can fill repeatedly.China just has up to ten million at the labour seamless steel gas cylinder.Be accompanied by the enforcement of environmentally friendly vehicle engineering, gas-fueled vehicles applying at home, the use amount of gas cylinder also grows with each passing day.The gas cylinder media stored has other gases at high pressure such as oxygen, nitrogen, hydrogen, petroleum gas.Gas cylinder leaks or the possibility of blast causes property loss and personal injury in order to reduce, and the gas cylinder before must coming into operation to dispatching from the factory reaches gas cylinder is under arms regularly done bullet, the amount of plastic deformation that gas cylinder is determined in the hydraulic testing.Gas cylinder is carried out the hydraulic testing, can accurately obtain the gas cylinder volume all deformation, the residual deformation amount, and can obtain rate of residual volumetric deformation.The measured rate of residual volumetric deformation value of gas cylinder by hydrostatic pressure test and gas cylinder defined are declared useless standard make comparisons, with foundation qualified as gas cylinder, that degradation uses or scraps.
When following gas cylinder by hydrostatic pressure test, the gas cylinder by hydrostatic pressure test device also arises at the historic moment.The U.S. is as maximum in the world gas cylinder production and use state, and its gas cylinder by hydrostatic pressure test device has been represented the technical merit of current gas cylinder by hydrostatic pressure test device undoubtedly.Its water test unit has passed through manual operations from the 20-30 age, and the course of the computer controlled automatic in 80-90 age has been arrived in 60-70 age semiautomatic control.Particularly,, make traditional gas cylinder by hydrostatic pressure test device improve the raising of transferring to the TT﹠C software configuration level and come up by hardware configuration because microcomputer widespread use and software development technique are constantly progressive from the nineties.The U.S. several big gas cylinder water test unit manufacturer provides computer measurement control gas cylinder by hydrostatic pressure test device.This computer measurement and control gas cylinder by hydrostatic pressure test device is furnished with the user friendly software that may operate at various operating platforms.Computer measurement and control gas cylinder by hydrostatic pressure test device has not only improved the precision of test findings greatly, and has improved the efficient of gas cylinder by hydrostatic pressure test and reduced labor intensity of operating personnel, makes failing to judge and judge possibility by accident and all significantly reducing of gas cylinder.
Background technology
GB GB/T9251-1997 " gas cylinder by hydrostatic pressure test method " makes explicit provisions to the basic demand and the test operation main points of gas cylinder by hydrostatic pressure test method, test unit.The gas cylinder by hydrostatic pressure test method of regulation has three kinds: withstand voltage test, outside measurement method gas cylinder volume deformation test (being called for short the outside measurement method test), internal test method gas cylinder volume deformation test (being called for short the internal test method test).And we have selected the outside measurement method test for use
The outside measurement method test is from its rate of residual volumetric deformation of gas cylinder external pelivimetry when gas cylinder is carried out the hydraulic testing.Be subjected to (1-2) calculating by formula of trial jar rate of residual volumetric deformation:
In the formula: η-the be subjected to rate of residual of the volume of trial jar, %
Δ V '-be subjected to the residual deformation amount of trial jar, ml
Δ V-is subjected to the volume all deformation of trial jar, ml
Be to measure rate of residual volumetric deformation, this experimental provision adopts is the deformation that the method for digital image analysis is measured the outside of gas cylinder.
Traditional method that adopts water jacket outside gas cylinder is subjected to external condition easily and disturbs, and exists the metering that changes for the water yield in the water jacket to be difficult to measure the accurate factor that waits these to produce error.Adopt the method for digital image analysis to avoid these error components, and can significantly improve the efficient of measurement from principle.Consider factors such as manually-operated error, we adopt the collection analysis and the real-time recorded data of computer controlled pressure pump and image, improve precision and the efficient measured.
Summary of the invention
The present invention has designed the flow process of a cover microcomputer measuring and controlling gas cylinder by hydrostatic pressure test system with reference to the relevant regulations of GB/T9251-1997 " gas cylinder by hydrostatic pressure test method "
The hardware of this device hydraulic testing mainly comprises digital camera head (or other image collection devices), host computer, tensimeter, reduction valve, force (forcing) pump, turntable etc., we are when this device of development, main reference GB/T9251-1997 " gas cylinder by hydrostatic pressure test method " and CGAC-1 " hydraulic test method of pressure gas gas cylinder " related request select design, mainly introduce the correlation technique parameter and the designing requirement of these hardware below.
This device adopts digital camera head to gather the distortion that is subjected to the gas testing bottle.At first obtain the outside drawing picture of gas cylinder by digital camera; Then the image that obtains is carried out the physical dimension of image processing process acquisition gas cylinders such as binaryzation, denoising, match, rim detection; Final program carries out three-dimensional modeling to calculate the deflection of gas cylinder with the gas cylinder size inside that obtains.Device adopts high-resolution camera, and precision can reach the required precision of actual gas cylinder distortion.
Image analysis software is said the data of gathering by real-time camera, extracts the effective information in the image through denoising, filtration, thereby obtains the variation about the physical dimension of gas cylinder.And gas cylinder is carried out three-dimensional modeling at software inhouse, go out the deflection of the volume of gas cylinder by comparative analysis constantly.
This device can adopt electro connecting pressure gauge, can set the upper limit of test pressure, plays the overpressure protection effect.The periodic inspection cycle of this pressure measuring instruments must not be above one month.
This device electric automatization is controlled moving of piston in the action of each solenoid valve and the piston metering buret.Acquisition module is digital signal with the data of sensor acquisition by analog signal conversion.The control power supply is responsible for providing power supply to solenoid valve
Power supply is selected need be according to selected control device decision, and its output rating must be greater than the total consumed power sum of various modules etc., and will leave 30% surplus.
Test pressure when native system need be measured gas cylinder by hydrostatic pressure test is so select pressure transducer for use.
The control system of test unit adopted distributed two-stage control mode (computing machine independently control with PLC also independently control can).
The principal feature of native system has:
1) this control system has adopted distributed two-stage control mode.Host computer can adopt the computer computing machine, and slave computer then can adopt by Programmable Logic Controller (PLC), signal acquisition module, power module, communication module, pressure transducer, communication module etc. to be formed.
2) improvement of pressure testing system: adopt pressure unit to come the pressure signal of measuring system, send into and handle in the slave computer and transform, host computer reads force value by the signal procedure module, and shows in real time on screen.
3) improvement of volume deformation measurement test system: survey outside in weight method and the internal test method, this device adopts digital image analysis external measuring method
4) control procedure and data acquisition are finished by the upper and lower machine is collaborative by communication module, and host computer is used to be provided with the functions such as collection, dynamic process test figure, real-time test pressure, water yield curve plotting and test report output of initial parameter, real-time monitoring test condition, gas cylinder deflection.Slave computer is realized at the trial to the action control of high-pressure pump, solenoid valve and the data acquisition in the process of the test.
5) image analysis software is said the data of gathering by real-time camera, extracts the effective information in the image through denoising, filtration, thereby obtains the variation about the physical dimension of gas cylinder.
6) in test can graphics mode dynamically show time/pressure in the process of the test, time/distortion, pressure/deformation relationship curve.System has preserved the total data of process of the test, and the user can check the Total Test data and all kinds of trial curve of the gas cylinder in the process of the test in needs.
7) can be set by the user the pressure and the dwell time of gas cylinder by hydrostatic pressure test.
8) can generate all kinds of test reports of gas cylinder by hydrostatic pressure test according to customer requirements.
9) user can revise controlled variable, realizes the different tests requirement to gas cylinder.
10) native system carries out real time monitoring to duty: abnormal alarms such as system overpressure warning are provided, can look unusual hazard level, the termination system operation.
The explanation of accompanying drawing drawing:
1-digital camera (or other image collection devices); 2-is subjected to trial jar; The 3-turntable; 4-pressure test instrument (reading test pressure uses); 5-precision pressure gauge (other pressure test instrument of verification are used); 6-pressure measuring instruments (indication, control pump top hole pressure are used); The 7-test pump; 8-test water groove; The 9-articulation; 10,11,12-high-pressure valve; 13,14-low pressure valve; The 15-special joint; The 16-servomotor.
Specific embodiments
1) record is subjected to the relevant data of trial jar
2) installation is subjected to trial jar
3) exhaust
Open valve 10 and 11 starts hydraulic pamp 7, stops hydraulic pamp 7, shut-off valve 10 after draining the air in the bearing pipe.
4) leave standstill
Use image analysis program, obtain the volume of current tested bottle 2 by digital camera 1.Whether have drift, if the no drift of amount then can change next-step operation over to if leaving standstill the volume of monitoring tested bottle 2 behind the 30s.Otherwise repeat the operation of this step.
5) zero-bit adjustment
The initial volume of the most tested bottle 2 of volume of the tested bottle 2 that is obtained by digital camera 1, being changed to of promptly at this moment tested bottle 2 volume is zero, and below Shi Yan volume change is a benchmark with this zero-bit all.
6) leak detection
Start hydraulic pamp 7, when the indicating value of pressure measuring instruments 4 and 6 is raised to the nominal operating pressure that is subjected to trial jar 2, stop hydraulic pamp 7, shut-off valve 11 backs check whether leakage is arranged.
Descend if find the indicating value of pressure measuring instruments 4, then expression has leakage, answers open valve 10, lays down pressure.If distinguish leaked by the trial jar bottle, then answer inscription record and end the test that this is subjected to trial jar.
7) boost
Confirming open valve 11 under the leak free situation, restart hydraulic pamp 7.When the indicating value of pressure measuring instruments 4 and 6 is raised to the test pressure that is subjected to trial jar 2, stop hydraulic pamp 7, shut-off valve 11.
8) pressurize
From shut-off valve 11 beginning pressurize timing.
After reaching the dwell time of regulation, by digital camera 1, obtain the volume change of tested bottle 2 once more, this value promptly is subjected to the full deformation values Δ of the volume of trial jar 19 V.
If the indicating value of pressure measuring instruments 4 descends, then answer inscription record and end the test that this is subjected to trial jar between hold period.
9) release
Open valve 11, slowly release.The indicating value for the treatment of tensimeter 4 is returned " zero " reading of data, obtains the residual deformation amount.
10) unload and be subjected to trial jar
From experimental provision, unload and be subjected to trial jar 2, unload special joint 15 from being subjected to trial jar.
Claims (4)
1. this gas cylinder tester with digital image analysis external measuring method, belong to the gas cylinder technical field of quality detection, it is characterized in that: assemble structure and form by digital camera part, image analysis software part, pressure detection part, electric control system, microcomputer tracking section.Its technical characterstic is: 1. use the method for image to detect the volume change that gas cylinder produces owing to pressure, measuring process is dry type measurement and contactless; 2. adopt image processing methods such as image denoising, match, rim detection to handle the image of gas cylinder, and go out all deformation and the residual deformation amount that deflection is a gas cylinder and calculate rate of residual through the three-dimensional simulation Modeling Calculation of program; 3. the overall process of device running need not human intervention by computer numerical controlled.Its feature has:
2. gas cylinder tester with digital image analysis external measuring method according to claim 1 is characterized in that: can use the method for graphical analysis to detect the volume change that gas cylinder produces owing to pressure, measuring process is dry type measurement and contactless.
3. gas cylinder tester with digital image analysis external measuring method according to claim 1, it is characterized in that: adopt image processing methods such as image denoising, match, rim detection to handle the image of gas cylinder, and go out all deformation and the residual deformation amount that deflection is a gas cylinder and calculate rate of residual through the three-dimensional simulation Modeling Calculation of program.
4. gas cylinder tester with digital image analysis external measuring method according to claim 1 is characterized in that: the overall process of device running need not human intervention by computer numerical controlled.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100507072A CN101881700A (en) | 2009-05-07 | 2009-05-07 | Gas cylinder tester with digital image analysis external measuring method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009100507072A CN101881700A (en) | 2009-05-07 | 2009-05-07 | Gas cylinder tester with digital image analysis external measuring method |
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| CN101881700A true CN101881700A (en) | 2010-11-10 |
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| CN2009100507072A Pending CN101881700A (en) | 2009-05-07 | 2009-05-07 | Gas cylinder tester with digital image analysis external measuring method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105043882A (en) * | 2015-08-11 | 2015-11-11 | 安徽远鸿机械自动化有限公司 | Pressure resistance detection device for packing container |
| CN108561752A (en) * | 2018-03-30 | 2018-09-21 | 西华大学 | A kind of FCEV system high pressures hydrogen storage fuel tank explosion-protection equipment |
| CN108871936A (en) * | 2018-09-06 | 2018-11-23 | 淮安信息职业技术学院 | A kind of vehicle gas cylinder hydraulic pressure detection control apparatus |
| CN109855982A (en) * | 2019-01-21 | 2019-06-07 | 中国石油天然气集团有限公司 | A kind of liquefied petroleum gas cylinder explosion test device and test method |
| CN111481204A (en) * | 2020-04-17 | 2020-08-04 | 郭晨光 | Breathing air bag and lung function index detection system, method and device |
| CN112284696A (en) * | 2019-07-11 | 2021-01-29 | 中国科学院半导体研究所 | Gas cylinder volume detection method and system based on 3D vision technology |
-
2009
- 2009-05-07 CN CN2009100507072A patent/CN101881700A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105043882A (en) * | 2015-08-11 | 2015-11-11 | 安徽远鸿机械自动化有限公司 | Pressure resistance detection device for packing container |
| CN108561752A (en) * | 2018-03-30 | 2018-09-21 | 西华大学 | A kind of FCEV system high pressures hydrogen storage fuel tank explosion-protection equipment |
| CN108871936A (en) * | 2018-09-06 | 2018-11-23 | 淮安信息职业技术学院 | A kind of vehicle gas cylinder hydraulic pressure detection control apparatus |
| CN109855982A (en) * | 2019-01-21 | 2019-06-07 | 中国石油天然气集团有限公司 | A kind of liquefied petroleum gas cylinder explosion test device and test method |
| CN112284696A (en) * | 2019-07-11 | 2021-01-29 | 中国科学院半导体研究所 | Gas cylinder volume detection method and system based on 3D vision technology |
| CN111481204A (en) * | 2020-04-17 | 2020-08-04 | 郭晨光 | Breathing air bag and lung function index detection system, method and device |
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Application publication date: 20101110 |