CN104777175B - The imaging method and device of hot cylindrical long material surface quality vision-based detection - Google Patents
The imaging method and device of hot cylindrical long material surface quality vision-based detection Download PDFInfo
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- CN104777175B CN104777175B CN201410010310.1A CN201410010310A CN104777175B CN 104777175 B CN104777175 B CN 104777175B CN 201410010310 A CN201410010310 A CN 201410010310A CN 104777175 B CN104777175 B CN 104777175B
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Abstract
The present invention is a kind of imaging method and device of hot cylindrical long material surface quality vision-based detection, the imaging device includes multiple imaging units, control system and synchronous adjusting mechanism, pass through synchronous adjusting mechanism, the location parameter that imaging unit needs to adjust is calculated by body length material outside dimension control system, synchronous adjusting mechanism realizes the adjust automatically of imaging unit.The present invention can need to detect the body length material surface quality of different model for same unit, vision detection system can adjust the position of imaging unit according to body length material external diameter, the distance between imaging sensor and body length material surface is set to keep constant, to obtain stable high quality graphic, so as to realize the stable on-line checking of hot cylindrical long material surface quality, cylindrical long material surface defect is found in time, the generation of batch defect is reduced, and improves lumber recovery.
Description
Technical field
It is specifically relevant a kind of for cylindrical long material surface quality the present invention relates to machine vision detection method and device
Visible detection method and device.
Background technology
Mechanical vision inspection technology is the important means for being widely used in product surface quality detection in recent years, and the technology is led to
Cross the image for obtaining detected object surface and image is analyzed and recognized, the surface quality to product is commented accordingly
Valency.The acquisition for detecting subject surface image is a very important link in vision detection system, is also vision detection system
Success realizes the key of its function.The acquisition of measurand picture rich in detail, depend in detecting system each Primary Component and
Measurand keeps the stabilization of each technical parameter.But, due to the change of working condition and technique, so as to cause measurand to be joined
Number often changes, and this needs the image device in synchronous adjustment vision detection system to ensure that imaging parameters do not change, from
And obtain the measurand image of stable and consistent.
In cylindrical long material surface quality detection, because cylindrical long material surface be circular shape, and detection position one
As be in high temperature, dust atmosphere, testing conditions are more severe；In addition, because of the cylindrical long material external diameter produced on same production line
Change in size, this undoubtedly also adds technical difficulty for detection.In recent years, researcher both domestic and external is to the long material of cold conditions cylinder
Inner surface test has carried out substantial amounts of research, and these researchs are mostly based on leakage field and ultrasonic detecting technology, applied to hot cylinder
The outer surface vision-based detection research of the long material of shape is then relatively fewer.It is entitled " to hot cylindrical member IMAQ and processing
System（Image capturing and processing system for hot profiles of revolution）"
EP2341330A2 European patents describe a kind of method being imaged to hot cylindrical long material surface, are disposed with into
The three groups of linear array CCD cameras and linear light sorurce of 120 degree of distributions, but the patent does not account for the change of cylindrical long material outside dimension
Change.It is the artificial OG companies for carrying out wire rod detection technique research in the world of application, entitled " with self-alignment based on removable
The measuring method and device of image（A method and apparatus of a portable imaging-based
measurement with self calibration）" the Chinese patent application of No. CN102549374A disclose scheme
Focused using the imaging mode for changing focal length, although consider the change of long material outside dimension, but adjustment and realization compared with
For difficulty.
The on-line checking of hot cylindrical long material surface defect is realized, for finding that the quality of cylindrical long material lacks as early as possible
Fall into, reduce the generation of batch defect, the lumber recovery for improving cylindrical long material is particularly significant.
The content of the invention
It is an object of the invention to provide a kind of imaging method and device of hot cylindrical long material surface quality vision-based detection,
It can be adjusted to according to cylindrical long material outside dimension as cell position, obtain the high-quality surface figure of the long material of different size cylinder
Picture, to realize hot cylindrical long material surface quality on-line checking.
A kind of imaging device of hot cylindrical long material surface quality vision-based detection is provided according to an aspect of the present invention, wrapped
Include：Base, multiple imaging units, control system and synchronous adjusting mechanism, the base center is formed with wears for cylindrical long material
The through hole crossed, has a bull gear in the through hole peripheral disposition, and the upper surface of bull gear is concentrically formed with flat in a circumferential direction
Face rectangular thread structure；The multiple imaging unit is separately fixed in mounting seat, and each imaging unit includes image sensing
Device and light source, and around the through hole, peripherally angle is arranged on the base at equal intervals, mounting seat bottom shape
Into there is rectangular thread to be engaged with described planar rectangular helicitic texture；The control system connects with described image sensor
Connect, to calculate the distance between imaging sensor and cylindrical long material outer surface；The synchronous adjusting mechanism is by stepper motor, small
Gear, the bull gear, the rectangular thread and rectangle plane rectangular thread structure composition, wherein, the stepper motor and institute
State control system connection, with receive control system calculating this apart from value signal to determine the rotation required for the stepper motor
Angle, little gear and bull gear intermeshing, the stepper motor is connected with little gear drives bull gear to turn with driving pinion
It is dynamic, drive each mounting seat together with each imaging unit synchronously along the side by the through hole center by planar rectangular helicitic texture
To the mobile and position of the multiple imaging unit of synchronous adjustment.
The multiple imaging unit is 3, and the equal intervals angle peripherally arranged around the through hole is 120
Degree.
The multiple imaging unit is 4, and the equal intervals angle peripherally arranged around the through hole is 90 degree.
The multiple imaging unit is 6, and the equal intervals angle peripherally arranged around the through hole is 60 degree.
A kind of imaging method of hot cylindrical long material surface quality vision-based detection is provided according to a further aspect of the invention, wrapped
Include：
Obtain the outside dimension of cylindrical long material；
Calculate the angle parameter that stepper motor needs to rotate；
Synchronous adjusting mechanism drives imaging unit synchronizing moving；
Imaging unit is adjusted in place；
Image is gathered by light source and imaging sensor；
Judge whether external diameter changes：If change, then obtain cylindrical long material outside dimension and continue subsequent step, otherwise
If unchanged adjustment terminates.
The stepper motor that calculates needs the angle parameter of rotation, including：When cylindrical long material outside diameter d change, by controlling
The distance between system-computed imaging sensor processed and cylindrical long material outer surface, stepper motor needs are determined according to the distance value
The angle of rotation.
The synchronous adjusting mechanism drives imaging unit synchronizing moving, including：Driven by stepper motor connected
Spur pinion is rotated, and drives bull gear to rotate to pass through the plane square of the circumferencial direction of bull gear upper surface by spur pinion
Shape helicitic texture drives the rectangular thread of mounting seat bottom to rotate, to control the imaging list of imaging sensor and combination of light sources
Member by the direction at cylindrical Chang Cai centers along being moved, so that the position of the imaging unit of the long material periphery of synchronous adjustment cylinder.
The present invention uses synchronous adjusting mechanism, realizes the sync bit adjustment of multiple imaging units, can obtain various outer diameter
The high quality graphic on the long material surface of size cylindrical, so that the stable on-line checking of hot cylindrical long material surface quality is realized,
Cylindrical long material surface defect is found in time, the generation of batch defect is reduced, and improves lumber recovery.
Brief description of the drawings
Fig. 1 is the main view of the imaging device of the hot cylindrical long material surface quality vision-based detection of one embodiment of the invention
Figure, wherein having made broken section；
Fig. 2 is the sectional view taken along line A-A in Fig. 1；
Fig. 3 is Fig. 1 right view；
Fig. 4 is the solid of the imaging device of the hot cylindrical long material surface quality vision-based detection of one embodiment of the invention
Figure；
Fig. 5 is the flow of the imaging method of the hot cylindrical long material surface quality vision-based detection of one embodiment of the invention
Figure.
Embodiment
For the above objects, features and advantages of the present invention can be become apparent, below in conjunction with tool of the accompanying drawing to the present invention
Body embodiment elaborates.Firstly the need of explanation, the present invention is not limited to following embodiments, this area
The spirit that technical staff should be embodied from following embodiments understands the present invention, and each technical term can be based on the present invention's
Spirit Essence makees broadest understanding.Same or analogous component is used the same reference numerals to represent in figure.
As shown in Figures 1 to 4, a kind of hot cylindrical long material surface quality vision-based detection of one embodiment of the present of invention
Imaging device 10, including：Base 1,4 imaging units 2, control systems（It is not shown）And synchronous adjusting mechanism.
Each part of above-described embodiment is illustrated below in conjunction with accompanying drawing.
The center of base 1 is formed with the through hole 1a passed through for cylindrical long material 5, has bull gear in through hole 1a peripheral disposition
1b, bull gear 1b upper surface are concentrically formed with planar rectangular helicitic texture 1b ' in a circumferential direction.42 points of imaging units
It is not fixed on mounting seat 2c, so that 4 imaging units 2 are peripherally arranged around through hole 1a with 90 degree of equal intervals angles.
In other embodiments, the quantity and position of imaging unit can set 3 according to the requirement of systemic resolution, be separated by 120
Degree arrangement, or setting 6, are separated by 60 degree of arrangements.Each imaging unit 2 includes imaging sensor 2a and light source 2b.Imaging is single
The planar rectangular helicitic texture 1b ' that the mounting seat 2c of member 2 bottom is formed with rectangular thread 2c ' with beating on gear ring 1b is engaged.
Control system is connected with imaging sensor 2a, the distance between outer surface to calculate imaging sensor 2a and cylindrical long material 5.
Synchronous adjusting mechanism is by stepper motor（Do not indicate）, little gear 4, bull gear 1b, rectangular thread 2c ', rectangle plane rectangular thread
Structure 1b ' is constituted.Wherein, stepper motor is connected with control system, with receive control system calculating this apart from value signal with true
Determine the rotational angle required for stepper motor.Little gear 4 and bull gear 1b intermeshing, stepper motor be connected with little gear 4 with
Driving pinion 4 drives bull gear 1b ' to rotate.Coordinated between mounting seat 2c and base 1 by its respective guide rail 2d, 1d, because
Can be driven when this is rotated under drives of the bull gear 1b in little gear 4 by planar rectangular helicitic texture 1b ' each mounting seat 2c together with
Each imaging unit 2 includes imaging sensor 2a and light source 2b, and synchronously edge is moved and synchronous adjustment by the direction at through hole 1a centers
Position.The tooth form that the little gear 4 and bull gear 1b are meshed in the present embodiment is straight-tooth, naturally it is also possible to use helical teeth.
As shown in figure 5, the hot cylinder for the one embodiment of the invention implemented using above-mentioned imaging device of the invention is long
The imaging method of material surface quality vision-based detection, including：
Obtain the outside dimension d of cylindrical long material 5；
Calculate the angle parameter that stepper motor needs to rotate：When cylindrical long material outside diameter d change, calculated by control system
The distance between imaging sensor 2a and the cylindrical long outer surface of material 5, determine that stepper motor needs what is rotated according to the distance value
Angle；
Synchronous adjusting mechanism drives imaging unit synchronizing moving：Connected spur pinion is driven by stepper motor
4 rotate, and spur pinion drives bull gear 1b to rotate to drive mounting seat 2c by the plane square helicitic texture 1b ' of circumferencial direction
The rectangular thread of bottom is rotated, to control the imaging unit 2 that imaging sensor 2a and light source 2b are combined along by cylinder
Long material 5 is the direction movement at through hole center, so that the position of the imaging unit of the long periphery of material 5 of synchronous adjustment cylinder；
It is adjusted in place imaging unit 2；
Image is gathered by light source 2b and imaging sensor 2a；
Judge whether external diameter changes：If change, then obtain cylindrical long material outside dimension d and continue above-mentioned follow-up step
Suddenly, if otherwise unchanged adjustment terminates.
As described above, imaging sensor 2a is along the angled arrangement in the cylindrical long periphery of material 5, when the cylinder of production is long
During the outside dimension d changes of material 5, the imaging sensor 2a of the cylindrical periphery of long material 5 is arranged in just along by cylindrical long material 5
Center line is through hole 1a center line synchronizing moving, and the image-forming range between imaging sensor 2a and the cylindrical surface of long material 5 is protected
Hold constant, reach the purpose for reliablely and stablely gathering the cylindrical surface image of long material 5.
In the imaging system of cylindrical long material surface, imaging sensor 2a and light source 2b are grouped together into imaging unit 2,
When imaging sensor 2a is with synchronous adjustment mechanism kinematic, light source 2b is also moved together, keeps the parameter constant of imaging system.Cause
This, the present invention can according to production different model cylindrical long each imaging unit 2 of the synchronous adjustment of material 5 position, to be kept into picture
Unit 2 and the constant high quality graphic to obtain stabilization in the distance between the cylindrical long surface of material 5.
In summary, the present invention can be adjusted using synchronous adjusting mechanism vision detection system according to cylindrical long material outside dimension
It is made into as cell position, obtains the high-quality surface image of the long material of different size cylinder, realize hot cylindrical long material surface
The online stable detection of quality, finds cylindrical long material surface defect in time, reduces the generation of batch defect, improves lumber recovery.
It should be understood that after the above-mentioned instruction content of the present invention has been read, those skilled in the art can be to present invention work
Various changes or modification, these equivalent form of values equally fall within the application appended claims limited range.
Claims (7)
1. a kind of imaging device of hot cylindrical long material surface quality vision-based detection, it is characterised in that including：It is base, multiple
Imaging unit, control system and synchronous adjusting mechanism；The base center is formed with the through hole passed through for cylindrical long material, in institute
Stating through hole peripheral disposition has bull gear, and the upper surface of bull gear is concentrically formed with planar rectangular screw thread knot in a circumferential direction
Structure；The multiple imaging unit is separately fixed in mounting seat, and each imaging unit includes imaging sensor and light source, and encloses
Around the through hole, peripherally angle is arranged on the base at equal intervals, the mounting seat bottom be formed with rectangular thread with
It is engaged with described planar rectangular helicitic texture；The control system is connected with described image sensor, to calculate image biography
The distance between sensor and cylindrical long material outer surface；The synchronous adjusting mechanism is by stepper motor, little gear, the canine tooth
Circle, the rectangular thread and rectangle plane rectangular thread structure composition, wherein, the stepper motor connects with the control system
Connect, with receive control system calculating this apart from value signal to determine the rotational angle required for the stepper motor, it is described small
Gear and bull gear intermeshing, the stepper motor is connected with little gear drives bull gear to rotate with driving pinion, passes through
Planar rectangular helicitic texture drives each mounting seat, and together with each imaging unit, synchronously edge is moved by the direction at the through hole center
And the position of the multiple imaging unit of synchronous adjustment.
2. the imaging device of hot cylindrical long material surface quality vision-based detection according to claim 1, it is characterised in that
The multiple imaging unit is 3, and the equal intervals angle peripherally arranged around the through hole is 120 degree.
3. the imaging device of hot cylindrical long material surface quality vision-based detection according to claim 1, it is characterised in that
The multiple imaging unit is 4, and the equal intervals angle peripherally arranged around the through hole is 90 degree.
4. the imaging device of hot cylindrical long material surface quality vision-based detection according to claim 1, it is characterised in that
The multiple imaging unit is 6, and the equal intervals angle peripherally arranged around the through hole is 60 degree.
5. a kind of imaging method of hot cylindrical long material surface quality vision-based detection, it is characterised in that using claim 1 to
Imaging device described in 4 is implemented, and the imaging method comprises the following steps：
Obtain the outside dimension of cylindrical long material；
Calculate the angle parameter that stepper motor needs to rotate；
Synchronous adjusting mechanism drives imaging unit synchronizing moving；
Imaging unit is adjusted in place；
Image is gathered by light source and imaging sensor；
Judge whether external diameter changes：If change, then obtain cylindrical long material outside dimension and continue subsequent step, if unchanged
Then adjustment terminates.
6. the imaging method of hot cylindrical long material surface quality vision-based detection according to claim 5, it is characterised in that
The stepper motor that calculates needs the angle parameter of rotation, including：When cylindrical long material external diameter change, calculated by control system
The distance between imaging sensor and cylindrical long material outer surface, determine that stepper motor needs the angle rotated according to the distance value
Degree.
7. the imaging method of the hot cylindrical long material surface quality vision-based detection according to claim 5 or 6, its feature exists
In, the synchronous adjusting mechanism drives imaging unit synchronizing moving, including：Drive connected straight-tooth small by stepper motor
Pinion rotation, drives bull gear to rotate to pass through the planar rectangular screw thread of the circumferencial direction of bull gear upper surface by spur pinion
Structure drives the rectangular thread of mounting seat bottom to rotate, to control the imaging unit edge of imaging sensor and combination of light sources logical
The direction movement at cylinder Chang Cai centers is crossed, so that the position of the imaging unit of the long material periphery of synchronous adjustment cylinder.
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| CN104777175B true CN104777175B (en) | 2017-08-25 |
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| CN107666569B (en) * | 2016-07-29 | 2020-04-28 | 宝山钢铁股份有限公司 | Automatic focusing method of steel pipe surface detection device |
| CN107976454A (en) * | 2017-11-16 | 2018-05-01 | 广州航海学院 | A kind of plastic pipe surface defect detection apparatus and its detection method |
| CN113567468B (en) * | 2020-04-28 | 2023-11-14 | 宝山钢铁股份有限公司 | Pipe rod surface self-adaptive imaging system and method suitable for V-shaped roller way conveying |
| CN113533368B (en) * | 2021-05-24 | 2022-10-21 | 国网河北省电力有限公司衡水供电分公司 | Electric pole crack detection device, control method and control terminal |
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| CN101258510A (en) * | 2005-08-02 | 2008-09-03 | Og技术公司 | Apparatus and method for detecting surface defects on a workpiece such as a rolled/drawn metal bar |
| EP2341330A2 (en) * | 2009-12-29 | 2011-07-06 | Fundación Robotiker | Image capturing and processing system for hot profiles of revolution |
| CN103650059A (en) * | 2011-07-13 | 2014-03-19 | 韩国电力技术株式会社 | Apparatus and method for inspecting pipelines |
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