CN207832129U - Engine link dimension measuring device based on machine vision - Google Patents
Engine link dimension measuring device based on machine vision Download PDFInfo
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- CN207832129U CN207832129U CN201721919108.6U CN201721919108U CN207832129U CN 207832129 U CN207832129 U CN 207832129U CN 201721919108 U CN201721919108 U CN 201721919108U CN 207832129 U CN207832129 U CN 207832129U
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Abstract
The utility model discloses the engine link dimension measuring devices based on machine vision, which is characterized in that including：One detection device comprising a bilateral telecentric lens and an optical image former with scale, the bilateral telecentric lens are mechanically connected to the camera lens of the optical image former by c-type interface；One lead screw slide unit, the detection device is fixed on by support bracket bolt on the lead screw slide unit, the lead screw slide unit includes a servo motor, drives the detection device to move axially to another final position from an initial position straight line of the lead screw slide unit by servo motor operating；One transmitting device a comprising transmission belt and an inverter motor are transmitted connecting rod to be measured by the inverter motor intermittent running one by one；And a control device, the control device includes programmable controller and industrial personal computer.
Description
Technical field
The measuring device for measuring engine link size based on machine vision that the utility model is related to a kind of.
Background technology
With the raising of industrial manufacturing process and precision component size, numerous parts need part sampling observation even full inspection, work
People must put into a large amount of manpowers and the time carrys out test product size.The engine link endoporus general 100mm or more of distance degree,
During realizing product size detection using conventional measurement devices, generally requires and artificially establish measuring basis, and only
It is positioned on platform and measurer detection can be used just now.Due to everyone establish coordinate and take point, line mode different, cause to survey
Error is measured, all data sheets is arranged after being measured again and is specified in masterplate to company, not only wasted time but also took efforts.And its
His of high cost and speed such as three-coordinates measuring machine is slow.Another special measurement mold is influenced by the accuracy of manufacture of itself, and it is long when
Between using bringing abrasion, while main manual operation.
If carrying out online linear measure longimetry with mechanical vision inspection technology, such as open CN102607421A institutes of China
A kind of disclosed big field image measurement method and equipment, and China publication number CN203100678U disclose one kind to high-precision
The line for spending dimensional measurement scans vision measurement system.But telecentric lens currently on the market can only measure in field range
Size, the product more than visual field will be unable to measure size, and the principle and main body for helping image measurer can only be connect measuring
Structure captures image border marginal point cloud, then be transferred to world coordinate system and be fitted measurement, while product must ajusted
In the case of can just be measured.For the measurement effect for ensureing more accurate, need to use bigbore bilateral telecentric lens, and
For bilateral telecentric lens with the increasing of bore, the optical polarization of optical center and marginal portion is bigger, it is difficult to ensure that measure
Accuracy, and will be unable to measurement size (bilateral telecentric lens measurement bore/visual field of general advanced degree more than the product of visual field
In 1 inch CCD size=long 12.8mm × wide 9.6mm).
Meanwhile with the development of engine link manufacturing process, various sizes of engine link needs are largely producing
It is manufactured on line, the length dimension if that can measure connecting rod in the transmission belt in production line will greatly improve connecting rod
Production efficiency, but when connecting rod on production line is transmitted be possible to the situation that deflects in the process of moving, institute
The photo of take can not accurately read picture displacement value, it would be highly desirable to which Structure of need is simple, more efficiently measurement method and with suitable survey
Amount device produces dimensional measurement demand to meet connecting rod.
Utility model content
For overcome the deficiencies in the prior art, it is used for based on machine vision the purpose of this utility model is to provide a kind of
The measuring device of engine link size is measured, not only measures reliable, precision height, but also high degree of automation, measurement efficiency are high,
It is big and adaptable to measure size range.
To achieve the goals above, the technical solution of the utility model is：Engine link size based on machine vision
Measuring device, including：
One detection device comprising a bilateral telecentric lens and an optical image former with scale, the bilateral telecentric mirror
Head is mechanically connected to the camera lens of the optical image former by c-type interface；
One lead screw slide unit, the detection device are fixed on by support bracket bolt on the lead screw slide unit, the lead screw slide unit
Including a servo motor, an initial position of the detection device from the lead screw slide unit is driven by servo motor operating
Straight line moves axially to another final position；
One transmitting device a comprising transmission belt and an inverter motor will be to be measured by the inverter motor intermittent running
Connecting rod transmits one by one；And
One control device, the control device include programmable controller and industrial personal computer；
The wherein described lead screw slide unit is disposed adjacent in the transmitting device so that being transmitted described in the detection device face
The shooting area under initial position described in simultaneously interval shooting is arranged in the top of device, and the transmitting device delivery is tested the one of connecting rod
When end is by the initial position, the detection device is able to obtain the image of tested connecting rod one end and is transmitted to the control
Device, while the control device sends the operating that stop signal stops the inverter motor to the programmable controller,
Image is obtained to the other end for being tested connecting rod by the final position that is moved to of the lead screw slide unit, the industrial personal computer is logical
The displacement data progress calculation process for acquiring two end images of the detection device acquisition in conjunction with the detection device is crossed, from
And obtain tested length of connecting rod.
Preferably, the lead screw slide unit includes bottom plate and cover board, and one end of the bottom plate is fixedly connected with the servo electricity
Machine is equipped with drive lead screw in the bottom plate, and the servo motor output shaft is connected on drive lead screw by shaft coupling and band
Dynamic lead screw rotation is equipped with the guide rail of a transverse shifting in backplate surface, and the guide rail extends parallel with the drive lead screw,
The guide rail is equipped with a sliding block, and lead screw slide unit bottom is fixedly connected with a slide block, and one is equipped in the middle part of the lead screw slide unit
Nut, the nut are sleeved on drive lead screw and drive the lead screw slide unit to move back and forth by drive lead screw rotation.
Preferably, the servo motor is the tail portion that high-precision servo motor is mounted on the lead screw slide unit, often encloses pulse
Number is set as 50000 pulses, and screw lead selects 5mm/ to turn, and the precision of slide unit movement is 5/50000=0.0001mm.
Preferably, the holder is set on the sliding block assembles the optical image former for being oriented to, the detection dress
The operating distance and focus adjustable of the bilateral telecentric lens and the optical image former set, according to the model of tested connecting rod institute
Determining standard size, then suitable operating distance and focal length have been manually adjusted, to ensure that the acquisition quality of sample image,
It can keep the indeformable of image objects.
Preferably, the bilateral telecentric lens are the big depth of field camera lens that amplification factor is 1X1, ensure that imaging does not distort,
Ensure that dimensional measurement is reliable.
Preferably, it is the high definition of 10/10000=0.001mm that the optical image former, which uses 71,000,000 pixels, pixel precision,
Area array CCD camera shooting precision is increased to by area array CCD camera by using the pixel segmentation technique of 10 frequencys multiplication
0.0001mm.The optical image former is communicatively coupled with the industrial personal computer.
Preferably, the center line of the bilateral telecentric mirror is overlapped with the center line of the optical image former, and and transmission belt
Area to be tested it is vertical.
Preferably, the detection device further comprises a light source.
Preferably, the transmitting device further includes active rotating shaft of the corresponding rolling assembling in the transverse ends of installation chassis
And driven spindle, active rotating shaft and driven spindle extend longitudinally, active rotating shaft is driven by the inverter motor, the biography
Defeated band is around being located between active rotating shaft and driven spindle.
Preferably, the optical image former, the light source, the inverter motor, the servo motor, the position sensing
Device is respectively connect with the programmable controller.
Preferably, the industrial personal computer has an image processing unit, the tested connecting rod for being acquired to the detection device
Image pre-processed and obtain the edge graph of the tested connecting rod.
Preferably, described image processing unit includes：Filter processing unit, for described in detection device acquisition
The image of tested connecting rod is filtered to obtain the first image；Dimensional Gaussian processing unit, for described first image into
Row dimensional Gaussian handles to obtain the second image；Morphological operation unit is obtained for carrying out morphological operation to second image
To third image；Edge detection unit, for being obtained from the third image using digital picture sub-pixel edge location algorithm
The edge graph of the tested connecting rod.
Preferably, the industrial personal computer has a comparison judgment unit, is used for the one end appearance edge graph of tested connecting rod
It is compared with the standard interlinking lever end apparent size to prestore, to judge to be tested whether interlinking lever end appearance matches the standard to prestore
Interlinking lever end appearance.
Preferably, the industrial personal computer is with a scale detection unit, in the image that the bilateral telecentric lens with scale photographed
With scale information, the scale detection unit is used for dimensions length in the image according to the tested connecting rod of scale reading acquisition.
Preferably, the industrial personal computer has a dimension calculating unit, based on the image by being acquired twice according to tested connecting rod
Dimensions length data and the calculating detection device shift length, the size that tested connecting rod is calculated after summarizing are long in nomogram picture
Degree.
Preferably, the industrial personal computer has a result recording unit, the quilt for being calculated the dimension calculating unit
It surveys in the dimensions length deposit database of connecting rod.
The beneficial effects of the utility model：
1, tested connecting rod need to be only placed in transmission belt by operating personnel, this measuring device can be automatically performed product to be measured
The processes such as convey, take pictures, analyzing and determining, until exporting testing result, then automatically into the detection of next product to be measured, transmission
Bring into give detection device take pictures harmony action, be not required to manual intervention, efficiently solve conventionally employed human eye detection and by hand take
It puts product and carries out the methods of the optical photographing detection defect that detection efficiency is low, False Rate is high, and sent out by the advance typing model
The dimension information of motivation connecting rod solves the orientation problem of the shooting of detection device initial position and final position shooting, can solve
Telecentric lens in the market can only measure size in field range, and the product more than visual field will be unable to measure size, be allowed to
Design is more easy to be reasonable.
It 2, can be in certain object distance range using the bilateral telecentric lens with scale and area array CCD camera, so as to get
Image magnification multiplying power will not change, with ultra-wide the depth of field, keep the field range of observation broad, general camera can be solved and made
At field of view center and field of view edge focus issues and problem of parallax experienced.
3, using the design of a detection device, without placing a detection dress using in each camera site
It sets, cost is lower.
4, automatic production line is can be widely used in, accomplishes not shut down online, carry out vision measurement to no manual intervention；
It can operate with multiple products and almost synchronize and measure, realize that high speed measures.
5, at a high speed, efficiently, it can be achieved that 24 hours work in addition to maintaining.
6,100% detection can be carried out to product, ex factory pass rate is up to 100%.
7, production cost is reduced, the efficiency of an equipment is equivalent to the workload of 3 employees.
8, it can be seamlessly connected with other transmission belts, meet the production requirement of most of client.
9, high-precision (measurement accuracy is up to 0.001 millimeter or more) vision measurement；
Description of the drawings
Fig. 1 is the structural schematic diagram of one preferred embodiment of the utility model.
Fig. 2 is the block diagram representation of one preferred embodiment of the utility model.
Fig. 3 is the image processing flow schematic diagram of one preferred embodiment of the utility model.
Fig. 4 is the measurement method flow diagram of one preferred embodiment of the utility model.
Fig. 5 is the image of shooting twice and displacement relation schematic diagram of one preferred embodiment of the utility model.
Fig. 6 is a wherein detection process schematic diagram for one preferred embodiment of the utility model.
Fig. 7 is wherein another detection process schematic diagram of one preferred embodiment of the utility model.
Detection device 10, bilateral telecentric lens 11, optical image former 12；
Lead screw slide unit 20, servo motor 21, holder 22, supporting rack 23, sliding block 24；
Transmitting device 30, transmission belt 31, inverter motor 32, supporting rack 33, active rotating shaft 34, driven spindle 35, belt
36；
Control device 40, programmable controller 41, industrial personal computer 42, image processing unit 421, comparison judgment unit 422, mark
Ruler detection unit 423, dimension calculating unit 424, result recording unit 425, filter processing unit 4211, dimensional Gaussian processing are single
Member 4212, morphological operation unit 4213, edge detection unit 4214.
Specific implementation mode
It is described below for open the utility model so that those skilled in the art can realize the utility model.It retouches below
Preferred embodiment in stating is only used as illustrating, it may occur to persons skilled in the art that other obvious modifications.It is retouched following
The basic principle of the utility model defined in stating can be applied to other embodiments, deformation scheme, improvement project, etc. Tongfangs
The other technologies scheme of case and spirit and scope without departing from the utility model.
It will be understood by those skilled in the art that in the disclosure of the utility model, term "upper", "lower", " preceding ",
The orientation or positional relationship of the instructions such as " rear ", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside" is based on attached
Orientation or positional relationship shown in figure, is merely for convenience of describing the present invention and simplifying the description, rather than instruction or dark
Show that signified device or element must have a particular orientation, with specific azimuth configuration and operation, therefore above-mentioned term cannot
It is construed as a limitation of the present invention.
In order to efficiently measure same model connecting rod dimensions length in the production line, solve in traditional sensing techniques scheme
Judge that criterion of acceptability is fuzzy and artificial detection takes longer problem；It solves due to observation angle, clarity and enlargement ratio
The inaccurate problem of caused detection；It solves the problems, such as since accuracy caused by artificial uncontrollable factor is low, efficiency is low, such as Fig. 1
A kind of engine link measuring external appearance size device based on machine vision is provided shown in Fig. 6, in this example embodiment
And its measurement method, the apparent size information of connecting rod is accurately quickly obtained using digital image processing techniques, can not only be made
Testing staff frees from the heavy duplication of labour, can also improve accuracy and the efficiency of connecting rod size detection.
As depicted in figs. 1 and 2, the utility model provide it is a kind of based on machine vision for measuring engine link size
Measuring device, including：Detection device 10 comprising the bilateral telecentric lens 11 with scale and optical image former 12, it is described double
Side telecentric lens 11 are mechanically connected to the lens interface of the optical image former 12 by c-type interface, when the optical image former
When the image of 12 acquisition connecting rods to be measured, the bilateral telecentric lens 11 irradiate the connecting rod to be measured from the surface of connecting rod to be measured；
Lead screw slide unit 20, the detection device 10 are installed on by support bracket bolt on the lead screw slide unit 20, and servo is passed through
21 intermittent running of motor drives the detection device 10 to be moved axially to separately from an initial position straight line of the lead screw slide unit 20
One final position, the distance between described initial position to the final position are the standard pitman shaft of a model to appearance ruler
It is very little；
Transmitting device 30 comprising transmission belt 31 and inverter motor 32 will be waited for by 32 intermittent running of the inverter motor
Connecting rod is surveyed to transmit one by one；
And control device 40 includes programmable controller 41 and industrial personal computer 42, the programmable logic controller (PLC) 41 passes through
Hub is connected with the industrial personal computer 42, and the programmable controller is connected to the servo motor 21 and the inverter motor
32,10 displacement signal of the detection device can be sent in the industrial personal computer 42 by programmable controller 41, record displacement letter
Breath is obtained each regional area for being tested connecting rod by the detection device 10, is compensated and asked to each topography by algorithm
With and detection device displacement distance, obtain the axial dimension length of monolithic linkage, the control device is communicatively coupled
In the transmitting device 30, acted with the harmony of the detection device 10 with controlling the operating of the transmission belt 31；It is wherein described
Lead screw slide unit 20, which is arranged on a supporting rack 23, to be disposed adjacently in the side of the supporting rack 33 of the transmitting device 30 and makes
The surface that the detection device 10 is arranged on the transmitting device 30 is obtained, to obtain the image of tested connecting rod, the control
Device 40 processed is communicatively coupled with the detection device 10 to acquire the image of the acquisition of the detection device 10, wherein the inspection
The shooting area under initial position described in 10 interval shooting of device is surveyed, one end that the delivery of the transmitting device 30 is tested connecting rod is passed through
When the initial position, the detection device 10 is able to obtain the image of tested connecting rod one end, while sending stop signal extremely
The control device 40 is moved to the terminal position to stop the operating of the inverter motor 32, by the lead screw slide unit 20
The other end acquisition image to being tested connecting rod is set, the control device 40, which passes through, acquires two that the detection device 10 obtains
End image carries out calculation process in conjunction with the displacement data of the detection device 10, to obtain tested length of connecting rod.In addition, this
Attached drawing in embodiment is only the schematic illustrations of the disclosure, is not necessarily drawn to scale.It certainly, in addition to this can be with
Including other parts such as power module in the prior art, input module and display modules, to this in this example embodiment
Do not do particular determination.
And specifically in this example embodiment, the lead screw slide unit 20 includes that bottom plate and cover board form closed entirety,
One end of the bottom plate is fixedly connected with the servo motor 21, and drive lead screw, the servo motor are equipped in the bottom plate
21 output shafts are connected on drive lead screw by shaft coupling and lead screw are driven to rotate, and transverse shifting is equipped in backplate surface
Guide rail, the guide rail extend parallel with the drive lead screw, and a sliding block 24,20 bottom of lead screw slide unit are equipped on the guide rail
Portion is fixedly connected with sliding block 24, and a nut is equipped at the middle part of the lead screw slide unit 20, the nut be sleeved on drive lead screw and by
Drive lead screw rotation drives the lead screw slide unit 20 to move back and forth.It is driven using screw component, and uses guide rail and sliding block
Cooperation guide moving back and forth for slide unit, mobile accuracy is high.So at work, the servo motor 21 drives the transmission
Lead screw rotates, and the drive lead screw coordinates with the nut, and since the nut does not follow rotation, therefore the drive lead screw can drive
The dynamic nut movement, the nut is to drive the movement of the lead screw slide unit 20, and the lead screw slide unit 20 is led described
Under the collective effect of rail and the sliding block 24, make the lead screw slide unit 20 that can only move back and forth along guide rail so that the lead screw
Slide unit can drive the slave initial position of the holder to be moved to final position.
Specifically, the servo motor 21 is high-precision servo motor 21, often encloses umber of pulse and is set as 50000 pulses, silk
Bar helical pitch selects 5mm/ to turn, the precision 5/50000=0.0001mm of slide unit movement.
Specifically, the transmitting device 30 further includes that corresponding rolling assembling turns in the active of the transverse ends of installation chassis
Axis 34 and driven spindle 35, active rotating shaft 34 and driven spindle 35 extend longitudinally, and active rotating shaft 34 is led to by inverter motor 32
It crosses the driving of belt 36 or is driven in other embodiments by shaft coupling, the transmission belt 31 is around being located at active rotating shaft 34
Between driven spindle 35.
Specifically, Castor structure can be arranged in the bottom of supporting rack 33, brake system is additionally provided on Castor structure, just
In artificial braking transmission operation.
It is noted that the structure of shown lead screw slide unit 20 and transmitting device 30 is only the example to the utility model
And it is unrestricted.The lead screw slide unit 20 of other embodiments according to the present utility model can also be other structures.As long as can reach
To the purpose of this utility model, the utility model is not particularly limited in this respect.
Specifically, the holder is set on the sliding block 24 assembles the optical image former 12, the inspection for being oriented to
The operating distance and focus adjustable for surveying the bilateral telecentric lens 11 and the optical image former 12 of device 10, according to be measured
The model of connecting rod determines standard size, then has manually adjusted suitable operating distance and focal length, to ensure that sample image
Acquisition quality can keep the indeformable of image objects.
Specifically, the bilateral telecentric lens 11 are the big depth of field camera lens that amplification factor is 1X1, ensure that imaging is not abnormal
Become, that is, ensures that dimensional measurement is reliable.
Specifically, it is the face of 10/10000=0.001mm that the optical image former 12, which uses 71,000,000 pixels, pixel precision,
Area array CCD camera shooting precision is increased to by array CCD camera by using the pixel segmentation technique of 10 frequencys multiplication
0.0001mm.Area array CCD camera has hi-vision stability, high-transmission ability and high anti-jamming capacity etc..
Specifically, the detection device 10 further comprises a light source, can show as circumferential dispersion light source or directional light
Source, light source directly affect the selection of the quality for acquiring image, subsequent picture signal processing complexity and algorithm, the light
Source, which can be set, is connected to the bilateral telecentric lens 11, can also be provided separately in one upright bar of the rack adjacent to institute
State transmission belt 31.The light source can also be connect with the inverter motor in another embodiment, the inverter motor tune
Angle of the light source in mounting plane is saved, as long as can guarantee detection zone by enough brightness can also there are many set in fact
Mode is set, as long as can reach the purpose of this utility model, the utility model is not limited in this respect.
Specifically, the center line of the bilateral telecentric lens 11 is overlapped with the center line of the optical image former 12, and with
The area to be tested of transmission belt 31 is vertical.
Specifically, the bilateral telecentric lens 11, the optical image former 12, the servo motor 21, the frequency conversion horse
It is respectively connect up to 32 with the programmable controller 41.
Specifically, there is vision software and algorithm in the industrial personal computer 42, rapidly image can be handled, such as Fig. 3
It is shown the image processing flow schematic diagram of one preferred embodiment of the utility model, the industrial personal computer 42 has an image procossing list
Member 421, the image of the tested connecting rod for being acquired to the optical image former is pre-processed and obtains the tested connecting rod
Edge graph；
Described image processing unit 421 further comprises that median filter for example may be used in filter processing unit 4211,
It is filtered to obtain first by the image for the tested connecting rod for acquiring the detection device 10 with mean filter
Image, industrial camera acquired image can inevitably be interfered by noise, can be eliminated by above-mentioned filter processing unit or
Reduce noise.
Described image processing unit 421 further comprises dimensional Gaussian processing unit 4212, for described first image
Dimensional Gaussian is carried out to handle to obtain the second image；Dimensional Gaussian final mask function can be arranged as follows：
Wherein X indicates the location of pixels of image；θ is the standard specimen model parameter of point, when model parameter it is known that so image is special
Sign positioned, that is, Gauss model peak position (u, v), which is floating type, that is to say that sub-pix is other
Grade.A indicates that the intensity of background, such as black region above, B indicate the peak value of the intensity in bright area.
Filtered treated when connecting rod image to be measured carries out dimensional Gaussian processing again, often in tie bar regions
Portion and edge form some tiny cavities and burr etc., smaller pseudo- target point are formed in background area, therefore will be to image
Morphological scale-space is carried out to eliminate the defect point occurred in image, while the shape and area of tie bar regions will not be changed, therefore,
Described image processing unit 421 further comprises morphological operation unit 4213, for carrying out morphology to second image
Operation obtains third image, can eliminate the burr occurred in image and pseudo- target first to the second image line opening operation
Then point carries out closed operation to image again, eliminate the hole occurred in image.
Described image processing unit 421 further comprises edge detection unit 4214, for utilizing digital picture sub-pix
Edge location algorithm obtains the edge graph of the tested connecting rod from the third image, in the case where image effect is not satisfactory
Capture characteristics of image can still be stablized.Sub-pixel positioning method directly can carry out local derviation to each parameter of error function and ask
It takes, can also be solved using gradient descent method, finally obtaining the relevant parameter of model, (solution very likely obtained here is
Locally optimal solution).In addition, described image processing unit 421 can also include other parts and carry out other processing steps.Example
Such as, it before being filtered step, can also be obtained by ordinate of pixel quantity using image pixel gray level rank as abscissa
The grey level histogram of image enhances picture contrast etc. by linear transformation, therefore not with this in the present exemplary embodiment
It is limited.
The industrial personal computer 42 have a comparison judgment unit 422, for by the one end appearance edge graph of tested connecting rod with
The standard interlinking lever end apparent size to prestore is compared, to judge to be tested whether interlinking lever end appearance matches.Only matching is outer
Computational length can be just gone after sight, otherwise the detection device 10 is always in interval shooting.It is described to prestore in this example embodiment
Standard connecting rod face shaping can be directly inputted in the external world by operating personnel, can also be by method in the prior art
Prestored after measurement, can also on detect to prestore after obtaining by the above method in this example embodiment.This example
In embodiment, the standard connecting rod apparent size to prestore includes connecting rod overall length, and passes through these standard connecting rod apparent sizes
The database for establishing a different model standard connecting rod apparent size, consequently facilitating calling when multilevel iudge.In addition, carry out
When multilevel iudge, it can be combined with allowable range of error and judge whether connecting rod to be detected is qualified, it then will be to be checked beyond error range
It surveys connecting rod and is determined as unqualified connecting rod.
Specifically, tested connecting rod outer diameter pixel edge and the figure with sub-pixel edge location algorithm to tested connecting rod are detected
As carrying out sub-pix precise positioning, interlinking lever end length shared pixel number N in the picture is tested to calculatei(i=1,2,
3..., 10), triggering carries out sub-pix precise positioning 10 times, finally by all obtained NiIt averages, obtains finally tested connect
Mean pixel number shared by pole length endI.e.
The industrial personal computer 42 has a scale detection unit 423, the figure of the tested connecting rod for reading acquisition according to scale
As dimensions length.The bilateral telecentric lens carry scale, and the image recognition publicity that need not be replicated can be more convenient to be read
Size so that measurement result can faster come out.The scale has zero and positive and negative number of division, most according to tested interlinking lever end
The outer edge point vertical scale value on the scale reads size number.
The industrial personal computer 42 has a dimension calculating unit 424, tested for being read according to the scale detection unit 423
The image that connecting rod acquires twice calculates dimensions length data in image, and calculates 10 shift length of detection device, summarizes
The dimensions length of tested connecting rod is calculated after addition.
The industrial personal computer has a result recording unit 425, the tested company for being calculated the dimension calculating unit
In the dimensions length deposit database of bar.
It should be noted that although being referred to several modules or list for acting the equipment executed in above-detailed
Member, but this division is not enforceable.In fact, according to embodiment of the present disclosure, it is above-described two or more
The feature and function of module either unit can embody in a module or unit.Conversely, an above-described mould
Either the feature and function of unit can be further divided into and embodied by multiple modules or unit block.
Another aspect according to the present utility model is started as shown in Fig. 4 to 7 using a kind of measurement of above-mentioned measuring device
The method of machine connecting rod size, includes the following steps：
(1) tested connecting rod one end is transmitted by 10 initial position of detection device just by the transmission belt 31
When lower section, the shooting of the detection device 10 is tested the image of interlinking lever end and passes to the control device 40；
(2) the standard specimen interlinking lever end that the control device 40 is prestored by judging whether matching after the image procossing to acquisition
Appearance；
(3) if the control device 40 judges to mismatch, above-mentioned steps (1) are returned to；
(4) so that the transmission belt 31 is stopped transmission if the control device 40 judges successful match and the detection is made to fill
Set 10 stoppings shooting；
(5) control device 40 drives the detection device 10 to be moved to by controlling the operating of lead screw slide unit 20
Final position, and shoot the image for being tested connecting rod the other end and pass to the control device 40；And
(6) by tested connecting rod, the image collected calculates come dimensions length data in image the control device 40 twice
And the 10 shift length data of detection device are calculated, three length datas calculate the lateral dimension of tested connecting rod after summarizing
Length.
Specifically, it before the step (1), is preset, including presets the bilateral telecentric lens 11 and institute
The Focussing of optical image former 12 is stated, standard specimen interlinking lever end image is preset, preset the initial position and presets the terminal
Position, it is standard connecting rod dimensions length to make distance between the two.As shown in figure 5, being that two predeterminated positions are clapped in an embodiment
The relation schematic diagram of the image and displacement taken the photograph is easy to understand the calculating of the dimension calculating unit 424.
Specifically, when measuring same model engine link, the two end images of standard specimen connecting rod that can prestore are initial
The matching object of position and final position.
Further, according to the standard size of the model, the control device 40 presets the initial position and the end
Point position, the engine link is in process of production since the deformation of metalwork or incompleteness lead to change in size, general size
Variation can measure accurate connecting rod lateral length size between 1~2cm by two predeterminated positions.
Specifically, in the step (2), the control device 40 is by the image processing unit of the industrial personal computer to institute
The tested connecting rod one end image for stating the acquisition of detection device 10 is pre-processed and obtains the edge graph of the tested connecting rod；With it is logical
The comparison judgment unit of the industrial personal computer 42 is crossed by the one end appearance edge graph of tested connecting rod and the standard interlinking lever end to prestore
Apparent size is compared, to judge to be tested whether interlinking lever end appearance matches.
Specifically, after the step (6), the control device 40 restarts the transmitting device and makes previous quilt
The engine link of measurement continues to transmit forward, and latter engine link to be measured enters immediately below final position by the inspection
It surveys device to photograph, the detection device 10 first carries out shooting to latter engine link to be measured from final position and moves again to
Initial position is shot.
That is, as shown in Figure 6 and Figure 7, to improve detection efficiency, detection method is first to be moved to end from initial position
Point position calculates size after being shot to previous connecting rod, followed by from final position be moved to initial position to latter connecting rod into
Size is calculated after row shooting, using initial position->Final position, final position->The measurement method of initial position cycle, more
Adapt to production line machineryization running.
Such as in practical operation, the two end images of major part and microcephaly for the standard specimen connecting rod that prestores, will be first as matching object
Beginning position is default with standard specimen big end end images match, and final position is preset with standard specimen small end of connecting rod end images match,
It, only can be by institute when tested big end end, which enters, presets initial position when then being measured to first tested connecting rod
The image that detection device 10 captures matching major part end is stated, tested small end of connecting rod end is carried out when then moving to final position
Capture images do not have to the image for matching small cephalic par again, because the error of same batch and model is only in order to save time at this time
By the present apparatus, the bilateral telecentric lens with scale can be precisely recorded only in 2cm, if being afraid of that error can also be again again
Matching is primary, terminates to identify at this time and measure, and the dimension data and displacement data preserved in image is accurately tested connecting rod
Size stores in the database；Restarting transmission belt is moved forwards with conveying connection rod, due at this point, the detection device 10 exists
Final position can be caught when that will first wait for tested small end of connecting rod end to enter final position at this time by the detection device 10
The image for matching small cephalic par is received, capture images are carried out to tested big end end when then moving again to initial position, with
This automation cycle shooting and measurement, efficient, it is accurate to measure, and is more advantageous to and adapts to the traditional production technology of engine link
In, it is easy to be extended and applied.
In addition, although describing each step of method in the disclosure with particular order in the accompanying drawings, this does not really want
These steps must be executed according to the particular order by asking or implying, or the step having to carry out shown in whole could be realized
Desired result.Additional or alternative, it is convenient to omit multiple steps are merged into a step and executed by certain steps, and/
Or a step is decomposed into execution of multiple steps etc..
It should be understood by those skilled in the art that the embodiments of the present invention shown in foregoing description and attached drawing are only used as
It illustrates and is not intended to limit the utility model.The purpose of this utility model completely and effectively realizes.The work(of the utility model
Energy and structural principle show and illustrate in embodiment, under without departing from the principle, the embodiment of the utility model
Can there are any deformation or modification.
Claims (10)
1. the engine link dimension measuring device based on machine vision, which is characterized in that including：
One detection device comprising a bilateral telecentric lens and an optical image former with scale, the bilateral telecentric lens are logical
Cross the camera lens that c-type interface is mechanically connected to the optical image former；
One lead screw slide unit, the detection device are fixed on by support bracket bolt on the lead screw slide unit, and the lead screw slide unit includes
One servo motor drives an initial position straight line of the detection device from the lead screw slide unit by servo motor operating
Move axially to another final position；
One transmitting device comprising a transmission belt and an inverter motor, by the inverter motor intermittent running, by connecting rod to be measured
It transmits one by one；And
One control device, the control device include programmable controller and industrial personal computer.
2. the engine link dimension measuring device based on machine vision as described in claim 1, wherein the lead screw slide unit
Top setting and interval shooting so that transmitting device described in the detection device face are disposed adjacent in the transmitting device
Shooting area under the initial position, when the initial position is passed through in one end that the transmitting device delivery is tested connecting rod, institute
It states detection device to be able to obtain the image of tested connecting rod one end and be transmitted to the control device, while the control device is sent out
It send stop signal to the programmable controller to stop the operating of the inverter motor, passes through being moved to for the lead screw slide unit
The final position obtains image to the other end for being tested connecting rod, what the industrial personal computer was obtained by acquiring the detection device
Two end images carry out calculation process in conjunction with the displacement data of the detection device, to obtain tested length of connecting rod.
3. the engine link dimension measuring device based on machine vision as claimed in claim 2, wherein the lead screw slide unit
Including bottom plate and cover board, one end of the bottom plate is fixedly connected with the servo motor, and drive lead screw is equipped in the bottom plate,
The servo motor output shaft is connected on drive lead screw by shaft coupling and lead screw is driven to rotate, and one is equipped in backplate surface
The guide rail of transverse shifting, the guide rail extend parallel with the drive lead screw, and a sliding block, the lead screw are equipped on the guide rail
Slide unit bottom is fixedly connected with a slide block, and a nut is equipped in the middle part of the lead screw slide unit, and the nut is sleeved on drive lead screw simultaneously
The lead screw slide unit is driven to move back and forth by drive lead screw rotation.
4. the engine link dimension measuring device based on machine vision as claimed in claim 3, wherein the servo motor
It is mounted on the tail portion of the lead screw slide unit for high-precision servo motor, often encloses umber of pulse and is set as 50000 pulses, screw lead choosing
It selects 5mm/ to turn, the precision of slide unit movement is 0.0001mm.
5. the engine link dimension measuring device based on machine vision as claimed in claim 3, wherein the holder is arranged
The optical image former, the bilateral telecentric lens of the detection device and the light are assembled in being used to be oriented on the sliding block
The operating distance and focus adjustable of imager are learned, it is artificial to be adjusted properly according to standard size determined by the model for being tested connecting rod
Operating distance and focal length.
6. the engine link dimension measuring device based on machine vision as described in claim 1, wherein the bilateral telecentricity
Camera lens is the big depth of field camera lens that amplification factor is 1X1；The wherein described optical image former uses 71,000,000 pixels, and pixel precision is
The area array CCD camera is shot essence by the high definition area array CCD camera of 0.001mm by using the pixel segmentation technique of 10 frequencys multiplication
Degree is increased to 0.0001mm, and the optical image former is communicatively coupled with the industrial personal computer.
7. the engine link dimension measuring device based on machine vision as described in claim 1, wherein the detection device
Further comprise a light source.
8. the engine link dimension measuring device based on machine vision as described in claim 1, wherein the transmitting device
Further include corresponding rolling assembling installation chassis transverse ends active rotating shaft and driven spindle, active rotating shaft and from turn
Axis extends longitudinally, and inverter motor described in active rotating shaft drives, and the transmission belt is around being located at active rotating shaft and driven spindle
Between.
9. the engine link dimension measuring device based on machine vision as described in claim 1, wherein the industrial personal computer has
There is an image processing unit, the image of the tested connecting rod for being acquired to the detection device is pre-processed and obtains the quilt
Survey the edge graph of connecting rod；Wherein described image processing unit includes：Filter processing unit, for what is acquired to the detection device
The image of the tested connecting rod is filtered to obtain the first image；Dimensional Gaussian processing unit, for first figure
It handles to obtain the second image as carrying out dimensional Gaussian；Morphological operation unit, for carrying out morphology behaviour to second image
Obtain third image；Edge detection unit, for utilizing digital picture sub-pixel edge location algorithm from the third image
Obtain the edge graph of the tested connecting rod.
10. the engine link dimension measuring device based on machine vision as claimed in claim 9, wherein the industrial personal computer has
There is a comparison judgment unit, for by the one end appearance edge graph of tested connecting rod and the standard interlinking lever end apparent size that prestores
It is compared, to judge to be tested whether interlinking lever end appearance matches the standard interlinking lever end appearance to prestore；The industrial personal computer has
One scale detection unit has scale information, the scale detection unit in the image that the bilateral telecentric lens with scale photographed
Dimensions length in the image of tested connecting rod for reading acquisition according to scale；The industrial personal computer has a dimension calculating unit,
Image for being acquired twice according to tested connecting rod calculates dimensions length data in image and calculates the detection device displacement
Length calculates the dimensions length of tested connecting rod after summarizing；The industrial personal computer has a result recording unit, is used for the ruler
In the dimensions length deposit database for the tested connecting rod that very little computing unit is calculated.
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| CN201721919108.6U CN207832129U (en) | 2017-12-29 | 2017-12-29 | Engine link dimension measuring device based on machine vision |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110319783A (en) * | 2019-07-05 | 2019-10-11 | 广东凯特精密机械有限公司 | A kind of guide rail detection device and detection method |
| CN110601063A (en) * | 2019-08-27 | 2019-12-20 | 东莞理工学院 | Cable cutting length measuring system and method based on visual positioning |
| WO2022012115A1 (en) * | 2020-07-13 | 2022-01-20 | 浙江跃进机械有限公司 | Detection device of connecting rod detection system and detection method therefor |
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2017
- 2017-12-29 CN CN201721919108.6U patent/CN207832129U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110319783A (en) * | 2019-07-05 | 2019-10-11 | 广东凯特精密机械有限公司 | A kind of guide rail detection device and detection method |
| CN110601063A (en) * | 2019-08-27 | 2019-12-20 | 东莞理工学院 | Cable cutting length measuring system and method based on visual positioning |
| CN110601063B (en) * | 2019-08-27 | 2020-07-10 | 东莞理工学院 | Cable cutting length measuring system and method based on visual positioning |
| WO2022012115A1 (en) * | 2020-07-13 | 2022-01-20 | 浙江跃进机械有限公司 | Detection device of connecting rod detection system and detection method therefor |
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