CN203216863U - Inspection system for thread deficiency in sheet-metal screw holes - Google Patents

Inspection system for thread deficiency in sheet-metal screw holes Download PDF

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Publication number
CN203216863U
CN203216863U CN 201320227020 CN201320227020U CN203216863U CN 203216863 U CN203216863 U CN 203216863U CN 201320227020 CN201320227020 CN 201320227020 CN 201320227020 U CN201320227020 U CN 201320227020U CN 203216863 U CN203216863 U CN 203216863U
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China
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video decoder
screw thread
screw hole
workpiece
mcu
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CN 201320227020
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Chinese (zh)
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王忠勇
马超
宋豫全
邓计才
高向川
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Zhengzhou University
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Zhengzhou University
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Abstract

The utility model discloses a kind of systems that inspection metal plate punching part screw hole screw thread whether there is, and in particular to a kind of Embedded Image Processing System based on computer vision technique. Technical problems to be solved are to judge whether metal plate punching part screw hole screw thread processes more difficulty, heavy workload, False Rate height, higher cost at present. The utility model includes that two cameras respectively take pictures to workpiece, the Video Decoder picture of shooting being respectively fed in total control box And Video Decoder
Figure DEST_PATH_IMAGE004
In, Video Decoder And Video Decoder It is connected with picture processing chip, picture processing chip connects MCU, and MCU is connected with memory, man-machine interface, approach switch sensor, vibrating disk and conveyer belt. The utility model with such a structure can fast and accurately judge that metal plate punching part screw hole screw thread whether there is, easy to operate, cheap, False Rate is low.

Description

Panel beating screw hole screw thread disappearance check system
Technical field
The utility model relates to a kind of system that checks whether metal plate punching spare screw hole screw thread exists, and specifically is a kind of embedded image disposal system that has or not based on tapping hole screw thread on the judgement metal plate punching spare of computer vision technique.
Background technology
The characteristics that metal plate punching spare has is frivolous, even, intensity is high and precision is high, processing cost is low, specification is consistent are widely used in the every field in the productive life, for example instrument and meter, household electrical appliances, office machinery, auto parts machinery, ornament materials etc.To the assembling of metal plate punching spare, adopt the screw hole connected mode of on stamping parts punching and tapping morely, the screw thread that this mode processes is very tiny, and it is very difficult to judge whether it processes.Traditional inspection method is to utilize artificial visual inspection, and so not only working strength is big, and as easy as rolling off a log appearance erroneous judgement.Vision system appears utilizing in recent years, by measure threaded hole area light reflection amount what as the foundation of judging whether threaded hole exists, the reflective amount in threaded hole is many, the reflective amount in threadless hole is few.Set a threshold value, greater than the screw thread that has been judged to be of threshold value, less than the no screw thread of being judged to be of threshold value.There are two shortcomings in such mode: one, utilize the mode False Rate of reflective amount very high merely, because the reflective amount in indivedual threaded holes seldom, and reflective amount is a lot of on the contrary in indivedual threadless hole; Two, cost is higher.Vision system often has a lot of functions, and the user is necessary for a use function wherein, namely adds up the function of reflective amount, and is that total system is checked.
The utility model content
The technical problems to be solved in the utility model is to judge at present whether metal plate punching spare screw hole screw thread processes comparatively difficulty, workload is big, False Rate is high, cost is higher, and a kind of cheap, easy to operate, panel beating screw hole screw thread disappearance check system that False Rate is low is provided.
For achieving the above object, the utility model adopts following technical proposals: a kind of panel beating screw hole screw thread disappearance check system, it comprises that threaded hole diameter that workpiece to be detected (11) is taken pictures checks that camera and the reflective amount of threaded hole check camera, and described threaded hole diameter checks that camera and the reflective amount of threaded hole check that camera sends picture shot into Video Decoder in the overhead control case respectively
Figure DEST_PATH_IMAGE001
And Video Decoder
Figure 798160DEST_PATH_IMAGE002
In, Video Decoder
Figure 535172DEST_PATH_IMAGE001
And Video Decoder
Figure 58557DEST_PATH_IMAGE002
Link to each other with picture processing chip, picture processing chip connects MCU, and MCU is with storer, man-machine interface, link to each other near switch sensor, vibrating disk and travelling belt.
Described each Video Decoder all is connected with corresponding inspection camera with Logic control module, crystal oscillator, power supply.
Described storer adopts FLASH and SRAM, and SRAM is that picture processing chip and MCU share.
Described MCU is connected with the light source of irradiation workpiece for measurement, and light source is at least a LED.
Described MCU is connected with alarm, and alarm is three look audible-visual annunciators.
Adopt the utility model of technique scheme, can judge fast and accurately whether metal plate punching spare screw hole screw thread exists, easy to operate, cheap, False Rate is low.
Description of drawings
Fig. 1 is device structure synoptic diagram of the present utility model.
Fig. 2 is that the utility model overhead control case built-in system constitutes synoptic diagram.
Fig. 3 is the utility model main program flow chart.
Fig. 4 is that the utility model checks algorithm flow chart.
Fig. 5 is that the utility model uses process flow diagram.
Embodiment
As depicted in figs. 1 and 2, the utility model comprises a kind of panel beating screw hole screw thread disappearance check system, it comprises that threaded hole diameter that workpiece 11 to be detected is taken pictures checks that camera 3 and the reflective amount of threaded hole check camera 4, and described threaded hole diameter checks that camera 3 and the reflective amount of threaded hole check that camera 4 sends picture shot into Video Decoder in the overhead control case 2 respectively
Figure 176817DEST_PATH_IMAGE001
And Video Decoder
Figure 418443DEST_PATH_IMAGE002
In, Video Decoder
Figure 631249DEST_PATH_IMAGE001
And Video Decoder
Figure 274720DEST_PATH_IMAGE002
Link to each other with picture processing chip, picture processing chip connects MCU, and MCU is with storer, man-machine interface, link to each other near switch sensor, vibrating disk and travelling belt.
Described each Video Decoder all is connected with corresponding inspection camera with Logic control module, crystal oscillator, power supply.
Described storer adopts FLASH and SRAM, and SRAM is that picture processing chip and MCU share.
Described MCU is connected with the light source 6 of irradiation workpiece for measurement, and light source 6 is at least a LED, and the illuminating ray that provides camera to need need adopt a plurality of LED according to actual conditions usually.
Described MCU is connected with alarm 5, and alarm 5 is three look audible-visual annunciators.
The threaded hole diameter checks that camera 3 is that diameter to the threaded hole of the workpiece to be detected 11 that arrives surveyed area 10 checks.Its process is taken the picture that arrives the surveyed area workpiece directly over the vertical workpiece, and picture is sent to overhead control case 2 does further image and handle.
The reflective amount of threaded hole checks that camera 4 is that reflective amount to the threaded hole of the workpiece to be detected 11 that arrives surveyed area 10 checks.Its process is to photograph the picture that reaches the surveyed area workpiece from the workpiece side, and picture is sent to overhead control case 2 does further image and handle.
Vibrating disk 7 is a kind of devices that automatically workpiece 11 to be detected are transported on the travelling belt 9, needs according to different types of workpiece specific customization.Its principle of work is: individual impulse mgnet is arranged below the vibrating disk hopper, can make hopper make vertical vibration, done around its Z-axis by the spring leaf drive hopper that tilts and rock vibration.Workpiece in the hopper rises along helical orbit owing to be subjected to this vibration.Screening or attitude through a series of tracks in the process that rises change, and workpiece can be unified state on request and enter travelling belt 9 automatically.
Travelling belt 9 drives its running by stepper motor 8.When a workpiece entered into the detection position, stepper motor 8 suspended rotation, and this moment, travelling belt was static, finished the workpiece screw hole and detected.When the workpiece screw hole was qualified, stepper motor was rotated further, and made next workpiece enter surveyed area and continued to detect.If workpiece is defective, stepper motor no longer is rotated further, and three look audible-visual annunciators become the redness of abnormality by the green of normal condition simultaneously, and send chimes of doom.
The utility model is described further below in conjunction with Fig. 3, Fig. 4, Fig. 5:
As shown in Figure 5, needing before the use earlier equipment to be carried out integral body inspection, whether the scope of examination: watch power lead and correctly be connected with signal wire, especially whether power lead has broken skin if comprising, checks whether vibrating disk 7 and motor and the circuit of travelling belt 9 have the part of burning.Whether each parts of checkout facility and screw have loosening phenomenon.If all are normal, can open device power supply (DPS), enter the user pattern is set.
Take a sample workpiece to be checked to be put into surveyed area, regulate the position that light source 6, screw hole diameter inspection camera 3 and the reflective amount of screw hole check camera 4, make the sample workpiece that shows on the monitor 1 the most clear.
The user arranges under the pattern, because the classification mode that the utility model adopts is neural network classifier, belong to the classification that supervision is arranged, therefore user's training classifier to the effect that need arrange, concrete operations are: prepare a large amount of qualified workpiece and defective workpiece, workpiece is placed into surveyed area 10 one by one.After placing qualified workpiece, after the system that treats extracted screw hole diameter and reflective amount information, work status was set to qualified, after placing defective workpiece, after the system that treats extracted screw hole diameter and reflective amount information, work status was set to defective, finishes the setting of criterion.
The workpiece of examine is put into the hopper of vibrating disk 7, press the start button, vibrating disk 7 begins vibration, simultaneously travelling belt 9 entrys into service.When workpiece to be detected begins to send from the discharging opening of vibrating disk 7, travelling belt 9 is transported to surveyed area 10 with workpiece, at this moment, and travelling belt 9 operation suspensions, the reflective amount inspection of screw hole diameter inspection camera 3 and screw hole camera 4 is taken workpiece simultaneously, and two pictures that will obtain are sent to overhead control case 2.
Fig. 4 is the detection algorithm process flow diagram of two pictures of 2 pairs of same workpiece that obtain of overhead control case, after the overhead control case successfully reads two pictures, two pictures that obtain is handled, and purpose is that subsequent characteristics is extracted and identification lays the first stone in order to carry out better.Treatment of picture is specifically comprised: image noise reduction is handled, and removes the picture noise pollution of kinds such as salt-pepper noise with methods such as medium filtering, average value filterings; The image histogram equilibrium, making the original image histogram transformation is to have the histogram that uniform density distributes, to increase the global contrast of the image that obtained; Image sharpening with the method for mask convolution and frequency domain filtering, strengthens the part of edge of image and Gray Level Jump, makes image become clear.
After processing finishes, extract the screw hole diameter and check that the screw hole diameter data of camera 3 workpiece in the image that obtains and the reflective amount of screw hole check the camera 4 reflective amount data of the screw hole of workpiece in the image that obtain, and with this two kinds of information fusion to data structure, namely differentiate in the array.
The nearest neighbor classifier that utilization is trained under user model carries out pattern classification to differentiating array, obtains the judgement of workpiece acceptance or rejection to be checked.
When workpiece is certified products, make the travelling belt running again, allow next workpiece enter surveyed area, repeat above-mentioned steps and carry out the detection of a new round.When workpiece was unacceptable product, travelling belt no longer continued operation, suspended vibrating disk, and three look audible-visual annunciators flash the redlight simultaneously, send chimes of doom.After pressing reset key, detect and just proceed.

Claims (5)

1. a panel beating screw hole screw thread lacks check system, it is characterized in that: it comprises that the threaded hole diameter that workpiece to be detected (11) is taken pictures checks that camera (3) and the reflective amount of threaded hole check camera (4), and described threaded hole diameter inspection camera (3) and the reflective amount inspection camera of threaded hole (4) are sent picture shot into the interior Video Decoder of overhead control case (2) respectively
Figure DEST_PATH_IMAGE002
And Video Decoder
Figure DEST_PATH_IMAGE004
In, Video Decoder
Figure 900248DEST_PATH_IMAGE002
And Video Decoder
Figure 99148DEST_PATH_IMAGE004
Link to each other with picture processing chip, picture processing chip connects MCU, and MCU is with storer, man-machine interface, link to each other near switch sensor, vibrating disk and travelling belt.
2. panel beating screw hole screw thread according to claim 1 disappearance check system is characterized in that: described each Video Decoder all is connected with corresponding inspection camera with Logic control module, crystal oscillator, power supply.
3. panel beating screw hole screw thread according to claim 1 lacks check system, it is characterized in that: described storer adopts FLASH and SRAM, and SRAM is that picture processing chip and MCU share.
4. panel beating screw hole screw thread according to claim 1 lacks check system, it is characterized in that: described MCU is connected with the light source (6) of irradiation workpiece for measurement, and light source (6) is at least a LED.
5. panel beating screw hole screw thread according to claim 1 lacks check system, and it is characterized in that: described MCU is connected with alarm (5), and alarm (5) is three look audible-visual annunciators.
CN 201320227020 2013-04-28 2013-04-28 Inspection system for thread deficiency in sheet-metal screw holes Expired - Fee Related CN203216863U (en)

Priority Applications (1)

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Application Number Priority Date Filing Date Title
CN 201320227020 CN203216863U (en) 2013-04-28 2013-04-28 Inspection system for thread deficiency in sheet-metal screw holes

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104122265A (en) * 2013-04-28 2014-10-29 郑州大学 Method and system for checking screw hole thread missing of metal plate
CN108010027A (en) * 2017-12-27 2018-05-08 合肥市雅视智能科技有限公司 A kind of screw abnormal automatic testing method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104122265A (en) * 2013-04-28 2014-10-29 郑州大学 Method and system for checking screw hole thread missing of metal plate
CN104122265B (en) * 2013-04-28 2016-12-28 郑州大学 Panel beating screw hole screw thread disappearance inspection method and system thereof
CN108010027A (en) * 2017-12-27 2018-05-08 合肥市雅视智能科技有限公司 A kind of screw abnormal automatic testing method
CN108010027B (en) * 2017-12-27 2020-08-28 合肥市雅视智能科技有限公司 Automatic screw abnormality detection method

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Granted publication date: 20130925

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