CN106643537B - Bearing oil duct method for automatic measurement based on structure light - Google Patents
Bearing oil duct method for automatic measurement based on structure light Download PDFInfo
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- CN106643537B CN106643537B CN201611259785.XA CN201611259785A CN106643537B CN 106643537 B CN106643537 B CN 106643537B CN 201611259785 A CN201611259785 A CN 201611259785A CN 106643537 B CN106643537 B CN 106643537B
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- oil duct
- line laser
- vision probe
- bearing
- laser transmitter
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/08—Measuring arrangements characterised by the use of optical techniques for measuring diameters
- G01B11/12—Measuring arrangements characterised by the use of optical techniques for measuring diameters internal diameters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
- G01B11/255—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures for measuring radius of curvature
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- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention discloses a kind of bearing oil duct automatic measurement system and method based on structure light, this system includes line laser transmitter, vision probe and driving turntable, bearing to be detected is fixedly installed on driving turntable and rotates synchronously with driving turntable, the line laser beam of the line laser transmitter forms continuous profile bus on the oil duct on bearing inner race surface to be detected, and the optical axis of the vision probe is directed at the profile bus.The present invention have many advantages, such as non-contact automatic measurement, without it is artificial participate in, precision is high and the period is short.
Description
Technical field
The present invention relates to bearing inner race oil duct detection fields more particularly to a kind of bearing oil duct based on structure light to survey automatically
Amount system.Moreover, it relates to a kind of method of the bearing oil duct automatic measurement system based on above structure light.
Background technique
The oil duct of existing bearing inner race is used to convey and be distributed lubricating oil, and size, shape and the position of oil duct influence bearing
Middle oil film pressure distribution situation, and then influence the performance of entire bearing.However, the oil duct of bearing inner race belongs to three-dimensional inside dimension,
The accurate detection of bearing inner race oil duct is one of problem of industry.
The most common oil duct measurement method of bearing industry at present are as follows: one piece of maximum limit of size template is used, by artificial
It measures and tests, the method can only judge the qualified or not of oil duct, not can determine that the actual size of oil duct.Occur in recent years
One kind opening up the method for imitating, and is filled using moulding materials such as resins into oil duct, and after formed solid, removal, which is opened up, to be imitated, and measures, this side
It is owned by France that in reverse molding method, not only process is cumbersome, the operation cycle is long, but also the measurement accuracy for opening up copy body is not high, in addition
Unreliable factor existing for inscription rubbing itself, therefore measurement accuracy is not high, effect is very unsatisfactory.
Summary of the invention
The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art, provide a kind of non-contact automatic measurement, nothing
It need to manually participate in, precision is high and period short bearing oil duct automatic measurement system and method based on structure light.
In order to solve the above technical problems, the invention adopts the following technical scheme:
A kind of bearing oil duct automatic measurement system based on structure light comprising line laser transmitter, vision probe and drive
Turn platform, bearing to be detected are fixedly installed on driving turntable and rotate synchronously with driving turntable, the line laser transmitter
Line laser beam forms continuous profile bus, the optical axis alignment of the vision probe on the oil duct on bearing inner race surface to be detected
The profile bus.
As a further improvement of the above technical scheme:
The automatic measurement system further includes base assembly, and the middle part of the base assembly is equipped with the peace of installation driving turntable
Fill hole, side be equipped with mounting bracket, line laser transmitter and vision probe it is contour, interval be set in same mounting bracket.
The bearing inner race surface to be detected is equipped with upper and lower two oil ducts, and the automatic measurement system includes that two lines swash
Optical transmitting set and two vision probes, a line laser transmitter and a vision probe are set in same mounting bracket, separately
One line laser transmitter and another vision probe are set in another mounting bracket, and two mounting brackets are oppositely arranged.
Jacket is provide with above the base assembly, the line laser transmitter, vision probe and driving turntable are respectively positioned on
In jacket；The vision probe includes camera and image capture lens, the output end and the image procossing in the external world of the camera
System connection.
A method of the bearing oil duct automatic measurement system based on structure light includes the following steps:
S1: in the state that line laser transmitter is closed, opened, vision probe is directed at the oil on bearing inner race surface to be detected
Ditch shoots piece image respectively；
S2: carrying out image procossing for the two images shot in S1, obtain the profile bus (30) of a single pixel width,
The profile bus (30) is subjected to edge extracting, obtains the marginal point coordinate P of line profilei(xi, yi)；
Wherein, i=1,2 ..., n；
S3: the marginal point coordinate P in step S2 is utilizedi(xi, yi) Least Square Circle fitting is carried out, obtain the half of fitting circle
Diameter R and central coordinate of circle Ci(xi, yi)；
Wherein, i=1,2 ..., n；
S4: all marginal point P are calculatedi(xi, yi) with the radial missing Δ of fitting circlei, calculate the radial missing ΔiMark
Quasi- difference Dev, deletes all radial missing ΔsiGreater than the marginal point of 3 times of standard deviation Dev；
Wherein, i=1,2 ..., n；
S5: carrying out Least Square Circle fitting using remaining marginal point again, finally obtains oil duct radius R1；
S6: stop after the interval angles that driving turntable (3) drives bearing (10) rotation to be detected to set, repeating said steps
S1~S5 obtains the oil duct radius R of the angle position2；Driving turntable (3) drives bearing (10) to be detected to continue one week, continuously
Obtain the oil duct radius R of multiple angle positionsj；
Wherein, j=1,2 ..., m；
S7: taking final measurement of the arithmetic mean of instantaneous value of the fitting radius of circle of all angle positions as oil duct radius R,
That is: R=(R1+R2+…+Rm)/m。
As a further improvement of the above technical scheme:
The step S2 further includes step S21~S22:S21: the two images that step S1 is shot carry out difference processing,
Background information is removed, clearly contour line is obtained；S22: being filtered step S21 difference image, removes noise spot, obtains
To the profile bus of a single pixel width.
In the step S1, the width that line laser transmitter issues line laser beam is not more than the 1/5 of the oil duct radius.
In the step S1, the depth of field of vision probe is greater than tested oil duct in the projected length of vision probe optical axis direction.
In the step S1, the angle of vision probe and line laser transmitter optical axis is greater than 45 °.
In the step S1, vision probe uses high-precision object space telecentric lens, and line laser transmitter is blue laser,
The line laser issued is blue light or blue violet light.
Compared with the prior art, the advantages of the present invention are as follows:
Bearing oil duct automatic measurement system based on structure light of the invention, structure is simple, is realized using structured light technique
The non-contact automatic measurement of oil duct overall size is participated in without artificial, and not only detection efficient increases substantially, but also can be maximum
Avoid to limit the interference of artifact, whole-course automation operation, stability is good, greatly improves measurement accuracy.
The method of bearing oil duct automatic measurement system based on structure light of the invention, method for automatic measurement is according to above-mentioned survey
The measurement data of amount system is calculated, and precision is high, and the period is short.
Detailed description of the invention
Fig. 1 is the schematic front view of the bearing oil duct automatic measurement system of the invention based on structure light.
Fig. 2 is the schematic top plan view of Fig. 1.
Fig. 3 is profile bus schematic diagram of the invention.
Fig. 4 is a width original image obtained in sampling process in measurement method step S1 of the invention.
Fig. 5 is the single pixel contour line schematic diagram of the invention obtained by image procossing.
Fig. 6 is contour fitting schematic illustration of the invention.
Each label indicates in figure:
1, line laser transmitter；2, vision probe；3, turntable is driven；4, base assembly；5, jacket；10, axis to be detected
It holds；20, bearing inner race surface to be detected；21, camera；22, image capture lens；30, profile bus；41, mounting bracket.
Specific embodiment
Below in conjunction with Figure of description and specific embodiment, invention is further described in detail.
Fig. 1 to Fig. 3 shows a kind of embodiment of bearing oil duct automatic measurement system based on structure light of the invention,
Including line laser transmitter 1, vision probe 2 and driving turntable 3, bearing 10 to be detected be fixedly installed in driving turntable 3 on and with
Turntable 3 is driven to rotate synchronously, in the present embodiment, driving turntable 3 includes turntable and the motor for driving turntable rotation.Line laser transmitting
The axis of rotation of bearing inner race to be detected is passed through in the direction for the line laser beam that device 1 issues, can be in bearing inner race oil duct surface shape
Many section profile buses 30, i.e. line are continuously formed under the drive of driving 3 continuous rotation of turntable at one section of profile bus 30
The line laser beam of laser emitter 1 forms continuous profile bus 30, vision on the oil duct on bearing inner race surface 20 to be detected
The optical axis of probe 2 is directed at profile bus 30, carries out track up, and obtained multistage profile bus 30 is subsequent acquisition bearing oil duct
Radius is prepared, this simple in measurement system structure, and the non-contact automatic measurement of oil duct overall size is realized using structured light technique,
Without manually participating in, not only detection efficient is increased substantially, but also can avoid the interference of artifact to the maximum extent, whole
Automatic operation, stability is good, greatly improves measurement accuracy.
In the present embodiment, bearing oil duct automatic measurement system of the invention further includes base assembly 4, in base assembly 4
Portion be equipped with installation driving turntable 3 mounting hole, side be equipped with mounting bracket 41, line laser transmitter 1 and vision probe 2 it is contour,
Interval is set in same mounting bracket 41, improves measurement accuracy.
In the present embodiment, bearing inner race surface 20 to be detected is equipped with upper and lower two oil ducts, and automatic measurement system includes two
Line laser transmitter 1 and two vision probes 2, a line laser transmitter 1 and a vision probe 2 are set to same installation branch
On frame 41, another line laser transmitter 1 and another vision probe 2 are set in another mounting bracket 41, two mounting brackets, 41 phase
To setting.Laser emitter 1 and vision probe 2 in same mounting bracket 41 is for measuring same oil duct.
In the present embodiment, jacket 5, line laser transmitter 1, vision probe 2 and driving turntable are provide with above base assembly 4
3 are respectively positioned in jacket 5, and jacket 5 plays the role of shading, reduce the influence of environment light；Vision probe 2 includes 21 He of camera
Image capture lens 22, the output end of camera 21 are connect with extraneous image processing system；Such as the output image of two cameras 21
Information is transmitted in computer and is handled, and finally obtains the size of the upper and lower oil duct of bearing inner race.
The method that fig. 4 to fig. 6 also shows a kind of bearing oil duct automatic measurement system based on structure light of the invention,
Include the following steps:
S1: in the state that line laser transmitter 1 is closed, opened, vision probe 2 is directed at bearing inner race surface 20 to be detected
Oil duct shoot piece image respectively；
S2: carrying out image procossing for the two images shot in S1, obtain the profile bus (30) of a single pixel width,
The profile bus (30) is subjected to edge extracting, obtains the marginal point coordinate P of line profilei(xi, yi)；
Wherein, i=1,2 ..., n；
S3: the marginal point coordinate P in step S2 is utilizedi(xi, yi) Least Square Circle fitting is carried out, obtain the half of fitting circle
Diameter R and central coordinate of circle Ci(xi, yi)；
Wherein, i=1,2 ..., n；
S4: all marginal point P are calculatedi(xi, yi) with the radial missing Δ of fitting circlei, calculate the radial missing ΔiMark
Quasi- difference Dev, deletes all radial missing ΔsiGreater than the marginal point of 3 times of standard deviation Dev；
Wherein, i=1,2 ..., n；
S5: carrying out Least Square Circle fitting using remaining marginal point again, finally obtains oil duct radius R1；
S6: stop after the interval angles that driving turntable (3) drives bearing (10) rotation to be detected to set, repeating said steps
S1~S5 obtains the oil duct radius R of the angle position2；Driving turntable (3) drives bearing (10) to be detected to continue one week, continuously
Obtain the oil duct radius R of multiple angle positionsj；
Wherein, j=1,2 ..., m；
S7: taking final measurement of the arithmetic mean of instantaneous value of the fitting radius of circle of all angle positions as oil duct radius R,
That is: R=(R1+R2+…+Rm)/m。
Bearing inner race oil duct automatic measurement system of the invention realizes that the non-of oil duct overall size connects using structured light technique
Automatic measurement is touched, is participated in without artificial, not only detection efficient increases substantially, but also can avoid artifact to the maximum extent
Interference, method for automatic measurement calculated according to the measurement data of measuring system, and precision is high, and the period is short.
In the present embodiment, above-mentioned steps S2 further includes step S21~S22:S21: the two images that step S1 is shot into
Row difference processing removes background information, obtains clearly contour line；S22: step S21 difference image is filtered, is gone
Except noise spot, the profile bus 30 of a single pixel width is obtained.
In the present embodiment, in above-mentioned steps S1, the width for the line laser beam that line laser transmitter 1 issues is far smaller than oil duct
Radius, generally within the 1/5 of oil duct radius.For example, the width of line laser beam is answered for radius is the oil duct of 1.0mm
It is advisable no more than 0.2mm.
In the present embodiment, in above-mentioned steps S1, the depth of field of vision probe 2 is greater than tested oil duct in 2 optical axis side of vision probe
To projected length, to guarantee that entire profile can blur-free imaging.For example, for the oil duct of radius 1.0mm, vision probe 2
Angle with line laser transmitter 1 is 45 °, and oil duct profile is about 1.4mm in the projected length of 2 optical axis direction of vision probe, because
This depth of field should be not less than 2mm.
In the present embodiment, in above-mentioned steps S1, the angle of vision probe 2 and 1 optical axis of line laser transmitter is greater than 45 °, with
Just higher profile measurement precision is obtained.
In the present embodiment, vision probe uses technical grade camera, and pixel number should meet the needs of measurement accuracy.It is above-mentioned
In step S1, vision probe 2 uses high-precision object space telecentric lens, to overcome the different surveys generated of tested oil duct profile height
Error is measured, and clearer picture quality can be obtained.Line laser transmitter 1 is blue laser, the line laser issued
For blue light or blue violet light, the imaging definition of profile bus can be significantly improved, to improve measurement accuracy.For example, line laser
The wavelength of device is 450nm.
Although the present invention has been disclosed as a preferred embodiment, however, it is not intended to limit the invention.It is any to be familiar with ability
The technical staff in domain, without deviating from the scope of the technical scheme of the present invention, all using the technology contents pair of the disclosure above
Technical solution of the present invention makes many possible changes and modifications or equivalent example modified to equivalent change.Therefore, all
Without departing from the content of technical solution of the present invention, according to the present invention technical spirit any simple modification made to the above embodiment,
Equivalent variations and modification, all shall fall within the protection scope of the technical scheme of the invention.
Claims (6)
1. a kind of bearing oil duct method for automatic measurement based on structure light, this method are automatic by the bearing oil duct based on structure light
Measuring system realizes that the bearing oil duct automatic measurement system based on structure light includes line laser transmitter (1), vision probe
(2) it is fixedly installed in driving turntable (3) and turns with driving turntable (3) is synchronous with driving turntable (3), bearing (10) to be detected
Dynamic, the line laser beam of the line laser transmitter (1) forms continuous wheel on the oil duct of bearing inner race surface (20) to be detected
The optical axis of wide bus (30), the vision probe (2) is directed at the profile bus (30)；System further includes base assembly (4), institute
The middle part for stating base assembly (4) is equipped with the mounting hole of installation driving turntable (3), and side is equipped with mounting bracket (41), line laser hair
Emitter (1) and vision probe (2) it is contour, interval be set on same mounting bracket (41)；The bearing inner race table to be detected
Face (20) is equipped with upper and lower two oil ducts, and the automatic measurement system includes two line laser transmitter (1) He Liangtai vision probes
(2), line laser transmitter (1) He Yitai vision probe (2) is set on same mounting bracket (41), another line laser hair
Emitter (1) and another vision probe (2) are set on another mounting bracket (41), and two mounting brackets (41) are oppositely arranged；It is described
It is provide with jacket (5) above base assembly (4), the line laser transmitter (1), vision probe (2) and driving turntable (3) equal position
In jacket (5)；The vision probe (2) includes camera (21) and image capture lens (22), the camera (21) it is defeated
Outlet is connect with extraneous image processing system；It is characterized by: the side of the bearing oil duct automatic measurement system based on structure light
Method includes the following steps:
S1: in the state of closing, open in line laser transmitter (1), vision probe (2) is directed at bearing inner race surface to be detected
(20) oil duct shoots piece image respectively；
S2: the two images shot in S1 are subjected to image procossing, the profile bus (30) of a single pixel width are obtained, by institute
It states profile bus (30) and carries out edge extracting, obtain the marginal point coordinate P of line profilei(xi, yi)；
Wherein, i=1,2 ..., n；
S3: the marginal point coordinate P in step S2 is utilizedi(xi, yi) carry out Least Square Circle fitting, obtain the radius R of fitting circle with
Central coordinate of circle Ci(xi, yi)；
Wherein, i=1,2 ..., n；
S4: all marginal point P are calculatedi(xi, yi) with the radial missing Δ of fitting circlei, calculate the radial missing ΔiStandard deviation
Dev deletes all radial missing ΔsiGreater than the marginal point of 3 times of standard deviation Dev；
Wherein, i=1,2 ..., n；
S5: carrying out Least Square Circle fitting using remaining marginal point again, finally obtains oil duct radius R1；
S6: stopping after the interval angles that driving turntable (3) drives bearing (10) rotation to be detected to set, and repeating said steps S1~
S5 obtains the oil duct radius R of the angle position2；Driving turntable (3) drives bearing (10) to be detected to continue one week, continuous to obtain
The oil duct radius R of multiple angle positionsj；
Wherein, j=1,2 ..., m；
S7: final measurement of the arithmetic mean of instantaneous value of the fitting radius of circle of all angle positions as oil duct radius R is taken, it may be assumed that R
=(R1+R2+…+Rm)/m。
2. measurement method according to claim 1, it is characterised in that: the step S2 further includes step S21~S22:
S21: the two images that step S1 is shot carry out difference processing, remove background information, obtain clearly contour line；
S22: being filtered step S21 difference image, removes noise spot, obtains the profile bus of a single pixel width
(30)。
3. measurement method according to claim 1 or 2, it is characterised in that: in the step S1, line laser transmitter (1)
The width for issuing line laser beam is not more than the 1/5 of the oil duct radius.
4. measurement method according to claim 1 or 2, it is characterised in that: in the step S1, the scape of vision probe (2)
It is deep to be greater than tested oil duct in the projected length of vision probe (2) optical axis direction.
5. measurement method according to claim 1 or 2, it is characterised in that: in the step S1, vision probe (2) and line
The angle of laser emitter (1) optical axis is greater than 45 °.
6. measurement method according to claim 1 or 2, it is characterised in that: in the step S1, vision probe (2) is used
High-precision object space telecentric lens, line laser transmitter (1) are blue laser, and the line laser issued is blue light or blue violet light.
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| CN108344370B (en) * | 2018-02-02 | 2020-04-28 | 山东大学 | Spiral welded pipe pipeline outer diameter measuring device and method based on double visual sensors |
| CN111982467B (en) * | 2020-07-17 | 2021-07-27 | 中国科学院西安光学精密机械研究所 | Device and method for aligning optical axis of collimator and optical axis of optical-mechanical system in stray light test |
| CN112990367A (en) * | 2021-04-25 | 2021-06-18 | 杭州晟视科技有限公司 | Image processing method, device, equipment and storage medium |
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| CN105865374B (en) * | 2016-03-24 | 2018-05-11 | 洛阳亨基智能数控装备科技有限公司 | A kind of measuring method of cylindrical roller radius of curvature |
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