CN102632090B - Band steel edge part pin hole detecting method - Google Patents
Band steel edge part pin hole detecting method Download PDFInfo
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- CN102632090B CN102632090B CN201110037079.1A CN201110037079A CN102632090B CN 102632090 B CN102632090 B CN 102632090B CN 201110037079 A CN201110037079 A CN 201110037079A CN 102632090 B CN102632090 B CN 102632090B
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- pin hole
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Abstract
The invention discloses a band steel edge part pin hole detecting method, which is characterized in that light emitting diode (LED) stroboscopic light sources are arranged above two edge parts of an operation band steel and are sequentially flickered from outside to inside, optical signals are received through a photoelectric receiver arranged under the band steel and are input into a computer through a signal collecting card, the band steel edge and corresponding pin hole signals are judged through the computer, and in addition, the pin hole signals are subjected to grading treatment, storage and display. The band steel edge positioning and pin hole light leakage detection principle is adopted, and the real-time precise positioning tracking on the band steel edge parts is realized, so the detection precision is higher, in addition, the detecting blind region can be reduced to be smaller than the single LED width, and no blind region is basically realized.
Description
Technical field
The present invention relates to steel defect detection technique, more particularly, relate to a kind of steel edge portion Pinhole method.
Background technology
Owing to being subject to the impact of the factors such as supplied materials, rolling line and working environment, Thin Strip Steel is unavoidable pin hole or the micropore (being referred to as below pin hole) of producing in the operation of rolling, and these needle pore defects can cause very serious consequence, greatly reduce product quality.Online pinhole detector is mounted to after production line, within the scope of certain precision and limit portion blind area, can effectively detect needle pore defect, ensures strip product quality.
At present, online pinhole detector adopts photoelectricity transformation principle to realize Pinhole mostly.Its principle is specially, and above band steel, fluorescence or LASER Light Source is installed, and photoelectricity receiver module is installed in below, realizes the pin hole optical signal detecting to the effective conversion between the signal of telecommunication.Simultaneously, for fear of the interference of limit portion surround lighting, the mode that traditional detection method often adopts mechanical catch to block in limit portion, in the time being with steel 1 limit portion left or move right variation, machinery catch 2 also will follow be with steel 1 limit portion carry out servo-actuated, with the pin hole flase drop (see figure 1) that prevents that limit portion light leak from causing.But in practical operation, mechanical catch 2 generally, all by servomotor band steel, is followed the tracks of strip edge edge, this method always can cause with limit portion larger on steel 1 width and detect blind area.In this detection blind area, once there be pin hole to occur, cannot accurately detect.Therefore, how, in ensureing steel edge portion Pinhole precision, can effectively overcome again machinery and block the brought limit portion larger problem in pinhole detection blind area, be need in a hurry at present research and solve.
Summary of the invention
For the above-mentioned shortcoming existing in prior art, the object of this invention is to provide a kind of steel edge portion Pinhole method, in order to reduce the detection blind area in strip width direction, and ensure accuracy of detection.
For achieving the above object, the present invention adopts following technical scheme:
The concrete steps of this steel edge portion Pinhole method are as follows:
A. above operation band steel both sides portion and along bandwidth direction, one LED stroboscopic light source is respectively set;
B. control each LED stroboscopic light source by steel edge portion lateral band steel middle part successively flicker;
C. with steel bottom, corresponding photelectric receiver is set in operation, also converting successively the signal of telecommunication to is sent to data acquisition card more successively to gather respectively optical signal;
D. the signal of telecommunication of inputting according to data acquisition card by computer, judges strip edge edge and pin hole signal;
E. pin hole signal is carried out to classification processing, and pin hole record is stored and shown.
In steps A, B, described each LED stroboscopic light source comprises multiple LED that are arranged side by side along bandwidth direction, its scitillation process is for adopting pulse scanning work mode, light successively LED from strip edge edge lateral band steel middle part, and in the time that next LED lights, previous LED closes automatically, only lights a LED at every turn.
In step D, by set threshold values signal in computer, and the signal of telecommunication of input and threshold values signal are compared, in the time that the signal of telecommunication is less than threshold values signal, be judged as strip edge edge signal, if after this there is again signal of telecommunication input, be judged as pin hole signal.
Described LED stroboscopic light source need meet the following conditions:
N＝d
max/d
w；(d
L/NT)≥V；
In formula, N is the LED quantity of each LED stroboscopic light source, d
maxfor strip running deviation maximum; d
wfor the width of each LED; d
lfor the length of LED; T is the single led scintillation pulse cycle; V is band steel speed of production.
In technique scheme, steel edge portion Pinhole method of the present invention by arranging LED stroboscopic light source above operation band steel both sides portion, and flicker successively from outside to inside, by being located at the photelectric receiver receiving optical signals with steel below, and input computer by data acquisition card, judge strip edge edge and corresponding pin hole signal by computer, and pin hole signal is carried out to classification processing, storage and demonstration.Owing to having adopted the detection principle of strip edge edge location and pin hole light leak, realized to steel edge portion in real time accurately location follow the tracks of, make accuracy of detection higher, and can be reduced to and be less than single led width detecting blind area, substantially realize non-blind area.
Brief description of the drawings
Fig. 1 is the principle schematic that the machinery of prior art blocks;
Fig. 2 is the flow chart of detection method of the present invention;
Fig. 3 is detection principle schematic of the present invention;
Fig. 4 be LED stroboscopic light source of the present invention figure is specifically set;
Fig. 5 is the working timing figure of electric scanning LED of the present invention.
Detailed description of the invention
Further illustrate technical scheme of the present invention below in conjunction with drawings and Examples.
Refer to shown in Fig. 2, the concrete steps of steel edge portion Pinhole method of the present invention are as follows:
A. first, above operation band steel both sides portion and along bandwidth direction, one LED stroboscopic light source is respectively set.Shown in Fig. 3, Fig. 4, have two LED stroboscopic light source 3 symmetries and be arranged on operation band steel 1 top, both sides of the edge, every LED stroboscopic light source 3 is made up of multiple diode luminescence pipe LED that are arranged side by side along bandwidth direction (being all called for short below LED), the LED quantity of every LED stroboscopic light source shown in Fig. 4 is 10, number consecutively is LED1～LED10 from outside to inside, covers whole band steel both sides portion region.
B. then, controlling each LED stroboscopic light source 3 is glimmered successively by band steel 1 limit portion lateral band steel middle part respectively.Be that LED stroboscopic light source 3 adopts pulse scanning work mode, light successively LED from strip edge edge lateral band steel middle part, and in the time that next LED lights, previous LED close automatically, only lights a LED at every turn.And LED stroboscopic light source 3 also needs to meet the following conditions:
N＝d
max/d
w；
(d
L/NT)≥V；
In formula, N is the LED quantity of each LED stroboscopic light source, d
maxfor strip running deviation maximum; d
wfor the width of each LED; d
lfor the length of LED; T is the single led scintillation pulse cycle; V is band steel speed of production.
Therefore,, in the time that the single led scintillation pulse cycle is T, each LED working pulse width is 1/2T, previous LED extinguishes after 1/2T, next LED lights, therefore the scan frequency of this LED stroboscopic light source is 1/ (NT), its concrete working timing figure refers to shown in Fig. 5.According to above-mentioned two formula requirements, can be according to the different length d with steel speed of production V and LED
l, strip running deviation maximum d
maxfinally determine the optimal number of the LED of each LED stroboscopic light source, avoid occurring that pin hole is undetected.
C. in operation band steel bottom, a pair of photelectric receiver 4 is set again, the optical signal that the LED stroboscopic light source 3 that collection is answered in contrast respectively sends, in the time that the LED of LED stroboscopic light source 3 glimmers respectively from outside to inside successively, corresponding photelectric receiver 4 receives each optical signal, and converts successively the signal of telecommunication to and be sent to data acquisition card 5.
D. the signal of telecommunication of inputting according to data acquisition card 5 by computer 6, judges strip edge edge and pin hole signal.Concrete principle is as follows: can be first according to test, on computer 6, set a threshold values signal, in the time that computer 6 often receives a signal of telecommunication, compare with this threshold values signal, taking a certain side of band steel as example, the LED quantity of supposing this side LED stroboscopic light source 3 is N, because the luminous not tape of the LED steel in steel 1 outside blocks, therefore the corresponding signal of telecommunication of this optical signal receiving is all greater than above-mentioned threshold values signal, and once the signal of telecommunication receiving is less than this threshold values signal, show that the luminous tape steel of this LED 1 edge blocks, if this LED is M (as the LED6 in Fig. 4), this LED is the LED with steel 1 respective side edges top position, show to detect band steel 1 marginal position, realize the accurate location with steel 1 edge.And M+1 LED afterwards starts to be judged as and formally enters the steel edge portion Pinhole stage.Due to blocking of tape steel, only have the pin hole of existence just to there will be light leak, therefore within this stage, once the photelectric receiver of below receives optical signal, computer is judged to be pin hole signal immediately, and by the arrangement position of corresponding LED, can determine corresponding pin hole position, until N LED lights end (as the LED10 in Fig. 4), complete after one-period, enter next flicker cycle, proceed to detect.
E. last, by computer 6, the pin hole signal gathering is carried out to classification processing, judge its order of magnitude, and pin hole record is stored in database and is presented on operation interface.
In sum, adopt steel edge portion Pinhole method of the present invention, can effectively detect with the limit portion needle pore defect of steel operation, and have following advantage:
1, can accurately locate steel edge portion in real time, not affected by strip running deviation etc.;
2, the blind area on a large scale that machinery-free blocks, and by width range single led in the control of steel edge portion pinhole detection blind area, realize basic non-blind area;
3, simple, convenient, can automatically locate and record each pin hole position, meet the demand that strip product quality detects completely.
Those of ordinary skill in the art will be appreciated that, above embodiment is only for the present invention is described, and be not used as limitation of the invention, as long as within the scope of connotation of the present invention, variation, modification to the above embodiment all will drop within the scope of claims of the present invention.
Claims (2)
1. a steel edge portion Pinhole method, is characterized in that,
The concrete steps of the method are as follows:
A. above operation band steel both sides portion and along bandwidth direction, one LED stroboscopic light source is respectively set, described each LED stroboscopic light source comprises multiple LED that are arranged side by side along bandwidth direction;
B. control each LED stroboscopic light source by steel edge portion lateral band steel middle part successively flicker, its scitillation process is for adopting pulse scanning work mode, light successively LED from strip edge edge lateral band steel middle part, and in the time that next LED lights, previous LED closes automatically, only light a LED, and described LED stroboscopic light source need meet the following conditions at every turn:
N＝d
max/d
w；(d
L/NT)≥V；
In formula, N is the LED quantity of each LED stroboscopic light source, d
maxfor strip running deviation maximum; d
wfor the width of each LED; d
lfor the length of LED; T is the single led scintillation pulse cycle; V is band steel speed of production;
C. with steel bottom, corresponding photelectric receiver is set in operation, also converting successively the signal of telecommunication to is sent to data acquisition card more successively to gather respectively optical signal;
D. the signal of telecommunication of inputting according to data acquisition card by computer, judges strip edge edge and pin hole signal;
E. pin hole signal is carried out to classification processing, and pin hole record is stored and shown.
2. steel edge portion Pinhole method as claimed in claim 1, is characterized in that:
In step D, by set threshold values signal in computer, and the signal of telecommunication of input and threshold values signal are compared, in the time that the signal of telecommunication is less than threshold values signal, be judged as strip edge edge signal, if after this there is again signal of telecommunication input, be judged as pin hole signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110037079.1A CN102632090B (en) | 2011-02-12 | 2011-02-12 | Band steel edge part pin hole detecting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110037079.1A CN102632090B (en) | 2011-02-12 | 2011-02-12 | Band steel edge part pin hole detecting method |
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| CN102632090A CN102632090A (en) | 2012-08-15 |
| CN102632090B true CN102632090B (en) | 2014-10-01 |
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|---|---|---|---|
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103706669A (en) * | 2013-12-25 | 2014-04-09 | 中国重型机械研究院股份公司 | Horizontal checkpoint of recoiler unit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5969373A (en) * | 1996-06-10 | 1999-10-19 | Harris Instrument Corporation | System for detecting small holes in moving articles |
| KR100267614B1 (en) * | 1996-12-26 | 2000-10-16 | 이구택 | Detecting device of pin hole for cold-rolled steel plate |
| CN201555811U (en) * | 2009-10-21 | 2010-08-18 | 宝山钢铁股份有限公司 | Strip side portion pinhole detection blind area control device |
| CN201644512U (en) * | 2010-03-03 | 2010-11-24 | 宝山钢铁股份有限公司 | Detecting device for detecting needle holes at edge part of thin-belt material |
-
2011
- 2011-02-12 CN CN201110037079.1A patent/CN102632090B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5969373A (en) * | 1996-06-10 | 1999-10-19 | Harris Instrument Corporation | System for detecting small holes in moving articles |
| KR100267614B1 (en) * | 1996-12-26 | 2000-10-16 | 이구택 | Detecting device of pin hole for cold-rolled steel plate |
| CN201555811U (en) * | 2009-10-21 | 2010-08-18 | 宝山钢铁股份有限公司 | Strip side portion pinhole detection blind area control device |
| CN201644512U (en) * | 2010-03-03 | 2010-11-24 | 宝山钢铁股份有限公司 | Detecting device for detecting needle holes at edge part of thin-belt material |
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| CN102632090A (en) | 2012-08-15 |
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