CN109931866A - A kind of tubing round thread dimensional parameters detection method and equipment - Google Patents
A kind of tubing round thread dimensional parameters detection method and equipment Download PDFInfo
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- CN109931866A CN109931866A CN201711355601.4A CN201711355601A CN109931866A CN 109931866 A CN109931866 A CN 109931866A CN 201711355601 A CN201711355601 A CN 201711355601A CN 109931866 A CN109931866 A CN 109931866A
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Abstract
The present invention relates to a kind of tubing round thread dimensional parameters detection method and equipment, are illuminated with source of parallel light, doubly telecentric camera lens, and area array CCD digital camera acquires tubing round thread cross-sectional image up and down；Profile sub-pixel edge is extracted with image processing software；Calculate the geometric parameter of cross-sectional image up and down.Detection device of the invention is mainly by pedestal, image acquisition component, the components such as riser guide mechanism composition, image acquisition component are made of bracket, the two parallel LED illumination light sources, two doubly telecentric camera lenses, two area array CCD digital monochrome cameras and the Image Acquisition that are fixed on bracket and processing software.The present invention uses source of parallel light, and telecentric lens can guarantee collected External Shape image, not be distorted in a certain range with distance that measuring speed is fast, obtain the measurement result of degree of precision.
Description
Technical field
The invention belongs to machine components detection technique fields, are related to the digital picture acquisition methods and equipment of part, can use
It is detected in regular screw threads and other part sizes.
Background technique
Oil pipe is that former oil and gas is transported pipeline to earth's surface from oil-gas Layer after the completion of probing, the use in oil field
Amount is very big, and the quality of tubing round thread directly influences the normal production in oil field.But at present in the production process of oil pipe, oil pipe
Thread size measures common manual method, cooperates a series of tools to carry out artificial detection using external thread gauge and cone gauge, this
Kind measurement method working efficiency is low, and artifical influence factor is very big.
How quickly, the size of accurate measurement tubing round thread spatial geometric shape, is that current detection technology is urgently to be resolved
Problem.
Universal threaded measuring instrument is divided into contact and optical laying formula.Contact type measurement instrument is popped one's head in certainly by two hemispherics
The method of centering realizes the measurement of screw thread, the problem is that the processing request to probe is high, pops one's head in and is easy in use process
Abrasion, probe are easy to fall off, and are needed when measuring screw thread using the supplementary means such as three needles, low efficiency, cumbersome.Optical laying formula
It is mainly measured by optical instruments such as universal tool-measuring microscopes, existing main problem is by human eye visual sight, people
More for error component, the degree of automation is low, low efficiency, and for a long time using causing human eye tired, universal threaded measuring instrument cannot be
Line measurement.
Summary of the invention
It is an object of the invention to propose a kind of image on-line checking for deficiency existing for above-mentioned existing detection method
The method and apparatus of tubing round thread geometric dimension reduces detection device cost to improve detection efficiency, detection accuracy.
In order to achieve the above-mentioned object of the invention, using following detection method:
1, with parallel LED illumination light source, doubly telecentric camera lens, area array CCD digital monochrome camera acquires thread segment image；
2, profile sub-pixel edge is extracted with image processing software；
3, calculate threads geometrical parameters, the parameters such as tooth height, screw pitch, cone angle and diameter including screw thread.
Detection device of the invention:
Technical solution: it is mainly made of pedestal and the image acquisition component being mounted on the base, image acquisition component is by pacifying
Base-mounted bracket, the parallel LED illumination light source of two beams being fixed on bracket, two doubly telecentric camera lenses, two area array CCDs
Digital monochrome camera and Image Acquisition and processing software form.
In image acquisition component, parallel LED illumination light source and telecentric lens are coaxially mounted on bracket.Bracket is mounted on bottom
On seat, it is desirable that lens axis is parallel with light source axis, is located at thread high part.
Top image acquisition component is mounted on supporting plate slide rail, which is equipped with the liter for cooperating lifting with it
Lead screw drops, and tested tubing round thread is placed on processing unit (plant) bracket, and measuring device camera lens is parallel with hand of thread spiral.
Two groups of doubly telecentric camera lenses and corresponding source of parallel light；Upper group of camera lens light source can be according to tubing diameter up and down adjustment
Position；Lower section is equipped with camera lens light source bracket.
The calculating process of the parameters such as Image Acquisition and tooth height, screw pitch, cone angle and diameter:
Pedestal is adjusted, lens location is adjusted by pedestal, so that lens axis is located at thread segment immediate vicinity, fixes
Camera position.
Illumination intensity, camera gain and aperture time are set.
The uncalibrated image for shooting known fixed size component, comes the position of calibration for cameras.Uncalibrated image is by top and the bottom two
Open image composition, to this group of image detection edge line, one semidiameter of set distance edge line under present image coordinate system
Two straight lines of distance are as calibration.
Screw thread gray level image to be measured is acquired with camera real-time online, and the measurement image in collection process can be intercepted at any time.
It is handled with screw image of the image processing software to interception, operation, obtains corresponding geometric parameter, screw thread
The parameters such as tooth height, screw pitch, cone angle and diameter.
Detection method structure is simple, and installation cost is low, easy to operate, and error is in 0.003mm.
Beneficial effects of the present invention:
The present invention will offer convenience to parts member geometric dimension measurement and more accurate measurement, is convenient for measuring,
The more conducively accurate processing of machine part.
Main advantages of the present invention:
Using source of parallel light, telecentric lens can guarantee collected External Shape image, in a certain range not with away from
From being distorted.It is fast that software measures image parameter speed.
It is calculated in image procossing using sub-pix, obtains the measurement result of degree of precision.
It may be mounted on process equipment, On-line sampling system.
Detailed description of the invention
Technical solution in order to illustrate the embodiments of the present invention more clearly, below will be to needed in embodiment description
Attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is only the present invention in order to illustrate more clearly of this hair
Bright embodiment or technical solution in the prior art, below will be p- required for describing the embodiments or the prior art attached
Figure is briefly described, for those of ordinary skill in the art, without creative efforts, can be with root
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is the structural diagram of the present invention.
In figure: 1, pedestal, 2, CCD digital monochrome cameras, 3, doubly telecentric camera lens, 4, camera lens light source bracket, 5, slide rail,
6, bracket vertical plate, 7, elevating screw, 8, parallel LED illumination light source, 9, it is tested screw thread.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Embodiment 1
Camera calibration measurement installs known profile size component on part processing stations to be measured, adjusts suitable position, make
Its lower edges is fallen in two camera perspectives, shoots its contour images, sets camera gain and aperture time, is acquired image, is obtained
Two section gray-scale images above and below to calibration component, extract two images edge contour, pass through contour line relevant position mark
Make the positional relationship between two cameras.
Embodiment 2
The measurement of screw thread geometric dimension: keep each asset location is motionless to place screw thread to be measured, two interfaces above and below acquisition screw thread
Gray level image extracts thread contour edge in image, finds the lower edges of thread, and it is straight to calculate upper edge and lower edge place
The equation of line, the distance between two straight lines are that the tooth of screw thread is high；Find out a parallel lines between two straight lines, the straight line with
There is intersection point at helical gear edge, and the distance for often skipping an intersection point is screw pitch；Using the profile edge extracted and utilize calibration
Calculate its cone angle and diameter.Above each parameter, or nominal data is used, it is calculated by geometry, to obtain the several of thread segment
What dimensional parameters.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (5)
1. a kind of tubing round thread dimensional parameters detection device, it is characterised in that:
Including pedestal and the image acquisition component being mounted on the base, described image acquisition component is by the support that is mounted on the base
Frame, the parallel LED illumination light source being fixed on bracket, doubly telecentric camera lens, area array CCD digital monochrome camera composition；
In image acquisition component, parallel LED illumination light source and doubly telecentric camera lens are coaxially mounted on bracket；Bracket is mounted on pedestal
On, it is desirable that lens axis is parallel with light source axis, is located at thread high part.
2. a kind of tubing round thread dimensional parameters detection device as described in claim 1, it is characterised in that:
Top image acquisition component is mounted on supporting plate slide rail, which is equipped with the lifting silk for cooperating lifting with it
Thick stick, tested tubing round thread are placed on processing unit (plant) bracket, and measuring device camera lens is parallel with hand of thread spiral.
3. a kind of tubing round thread dimensional parameters detection device as described in claim 1, it is characterised in that:
Two groups of doubly telecentric camera lenses and corresponding source of parallel light；Upper group of camera lens light source can be according to tubing diameter up and down adjustment position
It sets.
4. a kind of tubing round thread dimensional parameters detection method using the described in any item equipment of claim 1-3, feature exist
In this method comprises the following steps:
(1) with parallel LED illumination light source, doubly telecentric camera lens, the fixed known profile size of area array CCD digital monochrome camera acquisition one
Section image；
(2) it utilizes and measures fixing profile data in (1), demarcate the relative distance position of two cameras；
(3) with two groups of parallel LED illumination light sources, doubly telecentric camera lens, area array CCD digital monochrome camera acquires screw thread wheel up and down respectively
Wide cross-sectional image；
(4) profile sub-pixel edge is extracted with image processing software；
(5) by cross-sectional image above and below screw thread and camera relative distance position, its geometric parameter is calculated.
5. method as claimed in claim 4, it is characterised in that:
(1) pedestal is adjusted, lens axis position is adjusted by pedestal, makes following set lens axis between lower thread,
By elevating screw, adjustment above one group of lens axis between the screw thread of top；
(2) illumination intensity, camera gain and aperture time are set；
(3) the relative distance location position of uncalibrated image acquisition and camera is as follows:
After arrangement above is intact, fixed known profile size component is placed on bracket, its lower edges is made to fall within two cameras view
In angle, its contour images is shot；
Collected component outline image is handled with image processing software, operation, obtains and demarcate the phase of Current camera
It adjusts the distance position；
(4) detection process of screw image acquisition to be measured and geometric parameter is as follows:
After above step is carried out, keeps current all adjustment and is arranged constant, remove calibration component, place screw thread to be measured,
Shoot bottom profiled image thereon；
Collected thread contour image is handled with image processing software, operation, obtains the corresponding required geometry calculated
Parameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711355601.4A CN109931866A (en) | 2017-12-16 | 2017-12-16 | A kind of tubing round thread dimensional parameters detection method and equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711355601.4A CN109931866A (en) | 2017-12-16 | 2017-12-16 | A kind of tubing round thread dimensional parameters detection method and equipment |
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| CN109931866A true CN109931866A (en) | 2019-06-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711355601.4A Pending CN109931866A (en) | 2017-12-16 | 2017-12-16 | A kind of tubing round thread dimensional parameters detection method and equipment |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110849287A (en) * | 2019-11-27 | 2020-02-28 | 陕西理工大学 | Machine vision thread form angle compensation method |
| CN111238381A (en) * | 2019-11-06 | 2020-06-05 | 黑龙江大学 | Device and method for automatically measuring external thread parameters of steel pipe |
| CN116079138A (en) * | 2023-03-14 | 2023-05-09 | 广东盈通纸业有限公司 | Automatic control method of cylinder punching machine |
-
2017
- 2017-12-16 CN CN201711355601.4A patent/CN109931866A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111238381A (en) * | 2019-11-06 | 2020-06-05 | 黑龙江大学 | Device and method for automatically measuring external thread parameters of steel pipe |
| CN111238381B (en) * | 2019-11-06 | 2021-07-16 | 黑龙江大学 | Device and method for automatically measuring external thread parameters of steel pipe |
| CN110849287A (en) * | 2019-11-27 | 2020-02-28 | 陕西理工大学 | Machine vision thread form angle compensation method |
| CN110849287B (en) * | 2019-11-27 | 2021-05-25 | 陕西理工大学 | Machine vision thread form angle compensation method |
| CN116079138A (en) * | 2023-03-14 | 2023-05-09 | 广东盈通纸业有限公司 | Automatic control method of cylinder punching machine |
| CN116079138B (en) * | 2023-03-14 | 2023-10-20 | 广东盈通纸业有限公司 | Automatic control method of cylinder punching machine |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20190625 |