CN205665177U - Cable protection sleeve surface flaw detector - Google Patents

Abstract

The utility model discloses a cable protection sleeve surface flaw detector. Including detection zone, image acquisition unit and support component, the detection zone is including being cylindrical hollow cable passage, the image acquisition unit includes light source, camera and display, the light source is fixed in on the inner wall of cable passage, the light source is ring illuminator or point source of light, camera setting has a plurality ofly, and what the interval was even fixes around the cable passage, the axis direction of camera camera lens alignment line cable passageway, the camera is connected with the inside giga network card of industrial computer through surpassing six types of net twines, the support component sets up in the detection zone below. The utility model discloses can be used for the following defect of detection line cable sheath: 1 )Protruding bulge package, 2 )The pit naked wire, the peeling, 3 )The diameter is inhomogeneous, 4 )Mar and other defects of tubular product, rod. The detection range is wide and very practical, can effectively improve cable jacket manufacture factory's work efficiency and product yield.

Description

Cable jacket surface blemish detector

Technical field

This utility model relates to cable jacket detection technique, is specifically related to a kind of cable jacket surface blemish detector.

Background technology

Bulge that cable, optical cable, sheath surface when producing of cable product easily occur, pit, naked wire, rise Skin, scratches, and thickness is uneven waits surface blemish.

Owing to sheathing line is last road production process of optical cable, cable, cable, due to existing technical characterstic, I.e. production line speed of production is fast, automaticity is high, and it is bad that cable jacket is easy to produce flaw in process of production, if not Can directly when producing to bad detecting, getting rid of, the product quality of optical cable, cable will be directly influenced, the later stage circulates Client causes quality complain, bring the biggest loss to production manufacturer.

Existing cable wire bushing detects, and uses two groups or three groups of laser sensors, laser sensor is distributed in cable Surrounding, the laser blocked by cable, calculate current diameter, and by the fluctuation of diameter, judge that present cable protects The problems such as whether line set has bulge, broken hole and diameter abnormal.Fig. 1 is the schematic diagram of laser sensor of the prior art.Real Equipment shown in the industrial use in border 2 groups (vertical distribution) or 3 groups of (120 degree of distributions) Fig. 1.

But use the bulge of laser detection cable wire bushing and broken skin, have following a few point defect:

1, after detecting problem, there is no picture, it is impossible to carry out artificial judgment.

2, it is source of parallel light due to laser, uses two groups or three groups of laser, blind area can be produced, and use more sensing Device can bring extra cost and cannot avoid the generation of blind area.Fig. 2 is the schematic diagram of laser blind area.As in figure 2 it is shown, black region Territory is the blind area of laser.

Utility model content

For the deficiencies in the prior art, the utility model discloses a kind of cable jacket surface blemish detector.

The technical solution of the utility model is as follows:

A kind of cable jacket surface blemish detector, including detection zone, image acquisition units and support member；Described detection District includes the hollow cable passage in column；Described image acquisition units includes light source, camera and industrial computer；Described industrial computer Internally installed have network interface card；Described light source is fixed on the inwall of cable passage；Described light source is annular light source or point-like light Source；Described camera is provided with multiple, the evenly spaced cable passage surrounding that is fixed on, the axis of camera lens alignment cable passage Direction；Camera is connected with industrial computer by network interface card；Described support member is arranged on below detection zone.

Its further technical scheme is: described light source is annular light source, is provided with two groups, and one group is fixed on cable passage Porch, one group is fixed on exit, cable passage.

Its further technical scheme is: described camera is provided with three or four；If camera is provided with three, then Three camera intervals are uniformly fixed on cable passage surrounding, and the angle that is separated by between adjacent camera is 120 °；If camera sets Be equipped with four, then four camera intervals are uniformly fixed on cable passage surrounding, and the angle that is separated by between adjacent camera is 90 °.

Its further technical scheme is: be provided with cylinder in described support member, can drive detection zone upwards or to Lower motion.

Its further technical scheme is: also include that control circuit, described control circuit include manostat and encoder, surely The input output 220V single-phase alternating current of depressor, outfan connects industrial computer, 24V Switching Power Supply and 12V Switching Power Supply respectively； The outfan output 24V unidirectional current of described 24V Switching Power Supply, connects described light source；The outfan output of described 12V Switching Power Supply 12V unidirectional current, connects described encoder and camera respectively；The input of described encoder gathers the gait of march signal of cable, The pulse signal emission port of encoder launches pulse, drives the photographing switch of described camera；It is also associated with on described industrial computer Network interface card, described network interface card is connected with the data transmission port of camera by netting twine.

Advantageous Effects of the present utility model is:

1, this utility model can be used to detect the following defect effectively detecting cable jacket: 1) protruding bulge；2) pit dew Line, peeling；3) diameter is uneven；4) tubing, the cut of bar and other defect.Detection range extensively and the most practical, Ke Yiyou Effect improves work efficiency and the product yield of cable jacket manufacturer.

2, image acquisition units of the present utility model is mounted with illuminating light source, it is possible to use point source of light, it addition, This utility model also proposed the luminous uniform annular light sources of the internal use of preferred technical scheme, i.e. cable passage two groups, can Constitute uniform luminous bright field, outside uniform illumination cable jacket, it is ensured that the shooting quality of camera.Specifically used point source of light is also It is annular light source, depends on the diameter of cable and produce the speed that line runs；The cost of point source of light is lower, but if cable is straight Footpath is big, and the speed of service is big, then may select annular light source, illuminate effect more preferable

3, image acquisition units of the present utility model employs camera.But camera quantity is too much, then cost increase, camera Quantity is very few, then cannot photograph the four corner of cable jacket.By many experiments, the utility model proposes preferably Technical scheme, i.e. three or four cameras can be used.If using four cameras, then can be more than with 100% covering diameter The cable of more than 50mm；If using three cameras, then can be with 100% covering diameter cable less than below 50mm.Get final product root According to needing the cable parameter measured to select appropriate number of camera, with cost-effective on the basis of shooting completely.

4, the control circuit that the utility model proposes, can preserve defect picture for a long time, and record lacks in data base The batch number that falls into, size, the information such as position, it is simple to user collects product quality data.

5, the control circuit that the utility model proposes, can show current product defects image information in real time, effectively help Help user to solve in real time to produce extremely, improve production technology.

6, this utility model controls the shooting of camera, the capture rate of adjustable camera so that it is with coding by encoder The translational speed of the cable that device is collected is equal so that the image collected will not produce ratio and lose because of the change of speed Very.

Accompanying drawing explanation

Fig. 1 is the schematic diagram of laser sensor of the prior art.

Fig. 2 is the schematic diagram of laser blind area.

Fig. 3 is the side view of flaw detecting instrument.

Fig. 4 is the front view of flaw detecting instrument.

Fig. 5 is the luminous schematic diagram of annular light source.

Fig. 6 is the schematic diagram using three camera shootings.

Fig. 7 is the schematic diagram of control circuit.

Fig. 8 is the flow chart of data processing figure in detection method.

Detailed description of the invention

Fig. 3 is the side view of flaw detecting instrument.Fig. 4 is the front view of flaw detecting instrument.As shown in Figure 3, Figure 4, flaw inspection Survey instrument and include detection zone, image acquisition units and support member.

Detection zone includes the hollow cable passage 1 in column.Cable 6 passes cable passage 1 when detection.

Image acquisition units includes light source 2, camera 3 and display 4.Light source 2 is fixed on the inwall of cable passage 1.Light Source 2 can use point source of light or annular light source.Use point source of light cost relatively low, use annular light source then to illuminate effect more Good.The present embodiment employs two groups of luminous uniform annular light sources, one group of porch being fixed on cable passage 1, fixes for one group Exit in cable passage.Fig. 5 is the luminous schematic diagram of annular light source.As it can be seen, two groups of annular light sources can be formed all Uniform brightness, the most omnibearing cable that illuminates, increase the identification of camera shooting.

Camera 3 is provided with multiple, the evenly spaced cable passage surrounding that is fixed on, camera lens alignment cable passage Axis direction.Camera quantity is too much, then cost increase, camera quantity is very few, then cannot shoot cable jacket comprehensively.This practicality is new Type discloses preferred technical scheme, i.e. camera can arrange three or four.Fig. 6 is the signal using three camera shootings Figure.If camera is provided with three, then three camera intervals are uniformly fixed on cable passage surrounding, the adjacent phase between camera It it is 120 ° every angle；If camera is provided with four, then four camera intervals are uniformly fixed on cable passage surrounding, adjacent phase The angle that is separated by between machine is 90 °.Experiment display, if using four cameras, then its coverage can be with 100% covering diameter Cable more than more than 50mm；If using three cameras, then its coverage can be with 100% covering diameter less than below 50mm Cable.Can be according to the quantity of the parameter determination camera of tested cable.

Camera 3 is connected with display 4.Camera can be by the picture transfer that shot to display, and operator can be from display See processed image on device, defect cable is chosen, to increase the yield selling product.

Support member it is additionally provided with below detection zone.Support member includes cylinder 5.Detection region can be supported by cylinder 5 Come, and detection zone can be driven upwardly or downwardly to move, change the high and low position in detection region, to adapt to the requirement of production line.

Fig. 7 is the schematic diagram of control circuit.Control circuit includes manostat 7 and encoder 8, and the input of manostat 7 is defeated Going out 220V single-phase alternating current, after pressure stabilization function, outfan still exports the single-phase alternating current of 220V.The outfan of manostat Connect industrial computer 9,24V Switching Power Supply 10 and 12V Switching Power Supply 11 respectively.The outfan output 24V direct current of 24V Switching Power Supply 10 Electricity, connects light source 2.The outfan output 12V unidirectional current of 12V Switching Power Supply 11, connects encoder 8 and camera 3 respectively.Manostat 7,24V Switching Power Supply 10 and 12V Switching Power Supply 11 can use commercially available prod.Industrial computer 9 can use the data that have of routine to process The personal computer of function.

Light source 2 is annular light source, in the present embodiment, be model be the LED of CREE Q5.The model of encoder 8 is interior Close control OVW-1024-2MHT, its signal input port connection speed sensor, gather the rate signal that cable 6 is advanced, its arteries and veins Rush output port and control the photographing switch of camera.

Model be the encoder 8 of interior close control OVW-1024-2MHT be rotary encoder, there is an axle at encoder center, by External force drives this axle to rotate, and often rotates a certain angle, and encoder can export two groups of signals from A road and B road simultaneously, often organizes signal Each circle exports 1024 pulse signals altogether, and these two groups of signals are the output of dislocation 1/4 cycle, i.e. when A road signal is at ripple During the half of crest state, B road signal initially enters crest state, when A road signal ended crest state, jumps to trough state Time, B road signal is in the half of crest state.

Camera 3 be model be the line scan camera of DALSA SF-10-02K40-GE-02, the Gige interface of camera 3 passes through Netting twine connects network interface card 12.The model of network interface card 12 is Intel PRO/1000PTEXP19404PT, is connected on industrial computer 9.Work Control machine 9 connects display, output detections result by RS232 interface.

The operation principle of flaw detecting instrument is, manostat 7 and 24V Switching Power Supply 10 and 12V Switching Power Supply 11 is system After relevant portion is powered, encoder 8 runs simultaneously with cable 6, and encoder 8 sends pulse signal and switchs to the shooting of camera 3, Camera 3 is carried out shooting by the pulse signal driving of encoder and adopts figure.Owing to encoder 8 is with cable 6 runs simultaneously, therefore pulse Signal frequency and the speed Complete Synchronization of cable so that the image collected will not produce ratio and lose because of the change of speed Very.

Image captured by camera 3 is sent to network interface card 12 by Gige interface, i.e. kilomega network interface, and industrial computer 0 passes through net Card reads the image that camera 3 is collected, it is judged that product defect, and transmits the result to display device by RS232 interface.

Fig. 8 is the flow chart of data processing figure in detection method.In conjunction with Fig. 8, industrial computer include software adopt figure control unit, Image pre-processing unit, fault detection analysis unit.Use the method that detector described in the utility model carries out Defect Detection For:

Step 1, cable pass through cable passage, enter the scanning area of camera, and encoder gathers the Negotiation speed of cable, and The rate of scanning of speed controlling camera according to this；Camera carries out the identical synchronization of speed according to the rate signal that encoder collects and claps Take the photograph；

Step 2, software are adopted figure control unit and are driven the image transmitted to pass to image pre-processing unit in camera；Phase The image that machine drives transmission is gray value gray-scale map in the range of 0～255, sets image intensity value separation n；Image is pre- Image is split by processing unit, and image intensity value is the region of 0～n, it is determined that for background area, image intensity value be n～ The region of 255, it is determined that for cable region.

In the present embodiment, model be DALSA SF-10-02K40-GE-02 collected by camera to be 8 gray-scale maps, figure As a size of 2048*500, horizontal 2048 pixels, longitudinally 500 pixels.In image, each pixel is by 0～255 Gray value represents, gray value is that 0 representative image is completely black, and gray value is that 255 representative image are the whitest.Angle due to detector polishing And the angle of shooting so that the image background collected is the most completely black, and i.e. close to 0, cable region is then due to surface Diffuse-reflectance to light so that image is in the gray value interval of 40～50, in the present embodiment, uses 20 as gray scale Separation, gray scale region between 0～19 regards as background area, and cable is regarded as in gray scale region between 20～255 Region.

Step 3, to the cable region being partitioned into, i.e. cut zone, do Effective judgement.The cable that cut zone is i.e. selected Image.When height, width and the gray value of cut zone meet require time, it is judged that segmentation is effectively.The every of cut zone wants Ask that details are as follows:

(1) requirement for height of cut zone is: cut zone runs through whole image in a longitudinal direction；

The coordinate Y2 of this cut zone bottommost deducts the height that coordinate Y1 is region of this cut zone top.Due to Cable continuously produces, and therefore cable in the picture must be longitudinally through full figure, say, that the height of image Degree H=Y2-Y1+1, therefore when the value of Y2-Y1+1 is equal to H, it is judged that cut zone is effective coverage.In practical operation, generally Certain surplus can be left, such as, can set as Y2-Y1+1 >=H*0.98 in a program, then judge to meet this condition.Highly ginseng Number is determined by program is internal, can not freely arrange.

(2) width requirement of cut zone is: set a normal width value scope；Cut zone is longitudinally divided into several Deng subregion, the width of the subregion center line cables such as all is averaged, as the width of cut zone；The width of cut zone Within the scope of normal width value；

This requires the judgement of i.e. horizontal to cable region width.Owing to cable has shake in running unavoidably, Therefore the cable image photographed can present certain distortion.When measuring the width in cable region, consider efficiency and essence Degree, the method that program uses block sampling to be averaging calculates width.In the present embodiment, the cut section in any image is chosen Territory, is longitudinally divided into 10 intervals by it, in each interval, takes middle row, measures cut zone in the left and right two of this row Individual boundary point X1, X2, calculate the width W1=X2-X1 of this row.Value W1 10 interval measure arrived, W2, W3...W10 ask Meansigma methods, i.e. obtains the width W of present cable.

When actually used, user, according to cable thickness situation of change, sets the effective range of width.Such as, positive constant width Degree is 100 pixels, and during actual production, the thickness of cable likely can be in ± 20% fluctuation, then just by width effective range In being set as 80-120 interval.

(3), the gray value requirement of cut zone is: set a standard gray angle value scope；Cable image in cut zone In within the intensity value ranges that sets at this of the meansigma methods of gray value of all pixels；

In practical operation, the effective range being set by the user average gray value is interval.Average gray value i.e. effective coverage The meansigma methods of interior all pixel gray values.User, by regulation production technology, can measure the cable surface under different process Gray value, and in this, as setting interval.Therefore when the cable region photographed exceedes the scope that user sets, software Invalid image can be judged to, do not detect.

Effective coverage is passed to fault detection analysis unit by step 4, image pre-processing unit；

Step 5, step 5, fault detection analysis unit carry out Threshold segmentation to effective coverage；Set Threshold segmentation higher limit Xmax, Threshold segmentation lower limit xmin, obtain gray value pixel between xmax～xmin in cable image, it is determined that for different Chang Dian, the abnormal area of abnormity point composition entirety is stored in internal memory；Overall abnormal area is carried out UNICOM's operation, is allowed to into For multiple independent abnormal areas；And multiple independent abnormal areas are judged:

Set a Maximum Area ymax, set area minima ymin, when abnormal area area is less than minima, Then it is judged to noise spot, not as defect detection, when anomaly area is more than maximum, is then judged to abnormity point, not as lacking Fall into detection；

Set a gray scale maximum zmax, set minimum gray value zmin, when the gray value of abnormal area is less than minimum During value, then it is judged to noise spot, not as defect detection, when the gray value of abnormal area is more than maximum, is then judged to different Chang Dian, not as defect detection；

Select qualified region, be shown on main interface as defect.

In steps of 5, owing to light source uses oblique polishing, camera uses vertical shooting, the most this polishing mode meeting Making any depression on smooth surface all can reflect light with projection and form a bright spot, abnormal area is brighter than cable region Some.So by Threshold segmentation, gray value in image can be selected and meets the set of the pixel of a certain scope.

Such as, in a certain embodiment, arranging Threshold segmentation lower limit is 128, and higher limit is 255, then software is at cable In region, find all gray values pixel between 128-255, it is determined that for abnormity point, abnormity point is carried out UNICOM's operation, Make multiple independent abnormal area；And store unified for these regions, the result as Threshold segmentation is stored in In internal memory.

So-called connection operation, is a noun in image algorithm.After Threshold segmentation, define many zonules.? Computer-internal, these regions store with an entirety, connection operation, it is simply that find out in an entirety all of solely Vertical region, isolated area can separate and individually stores, in order to later stage process.

After connection operation, program can individually calculate their area, Ji Gai district to each independent abnormal area The pixel number that territory comprises, and the average gray in this block region, and independent abnormal area is judged.

Finally by qualified region, it is shown on main interface as defect.

Above-described is only preferred implementation of the present utility model, and this utility model is not limited to above example.Can To understand, those skilled in the art directly derive or associate on the premise of without departing from spirit of the present utility model and design Oher improvements and changes, within being all considered as being included in protection domain of the present utility model.

Claims (5)

1. a cable jacket surface blemish detector, it is characterised in that: include detection zone, image acquisition units and supporting part Part；Described detection zone includes the hollow cable passage in column；Described image acquisition units includes light source, camera and industry control Machine；Described industrial computer is internally installed network interface card；Described light source is fixed on the inwall of cable passage；Described light source is annular light source Or point source of light；Described camera is provided with multiple, the evenly spaced cable passage surrounding that is fixed on, camera lens alignment cable The axis direction of passage；Camera is connected with industrial computer by network interface card；Described support member is arranged on below detection zone.

2. cable jacket surface blemish detector as claimed in claim 1, it is characterised in that: described light source is annular light source, Being provided with two groups, one group is fixed on porch, cable passage, and one group is fixed on exit, cable passage.

3. cable jacket surface blemish detector as claimed in claim 1, it is characterised in that: described camera be provided with three or Person four；If camera is provided with three, then three camera intervals are uniformly fixed on cable passage surrounding, between adjacent camera The angle that is separated by be 120 °；If camera is provided with four, then four camera intervals are uniformly fixed on cable passage surrounding, adjacent Camera between the angle that is separated by be 90 °.

4. cable jacket surface blemish detector as claimed in claim 1, it is characterised in that: it is provided with in described support member Cylinder, can drive detection zone upwardly or downwardly to move.

5. cable jacket surface blemish detector as claimed in claim 1, it is characterised in that: also include control circuit, described Control circuit includes manostat and encoder, and the input output 220V single-phase alternating current of manostat, outfan connects work respectively Control machine, 24V Switching Power Supply and 12V Switching Power Supply；The outfan output 24V unidirectional current of described 24V Switching Power Supply, connects described light Source；The outfan output 12V unidirectional current of described 12V Switching Power Supply, connects described encoder and camera respectively；Described encoder Input gathers the gait of march signal of cable, and the pulse signal emission port of encoder launches pulse, drives described camera Photographing switch；Being also associated with network interface card on described industrial computer, described network interface card is connected with the data transmission port of camera by netting twine.