CN201004009Y - Belt material automatic centering CPC detection device based on CCD - Google Patents
Belt material automatic centering CPC detection device based on CCD Download PDFInfo
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- CN201004009Y CN201004009Y CNU2007200312278U CN200720031227U CN201004009Y CN 201004009 Y CN201004009 Y CN 201004009Y CN U2007200312278 U CNU2007200312278 U CN U2007200312278U CN 200720031227 U CN200720031227 U CN 200720031227U CN 201004009 Y CN201004009 Y CN 201004009Y
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Abstract
The utility model discloses a CPC electro-optical detection of the CCD strip automatic centration, and consists of detection sensors and a light source which is a rectangle array formed by an infrared LBD with the wavelength of 700 to 900 nm. The detection sensor comprises an optical lens, a narrow band filter, a linear array CCD, a laser alignment machine, as well as a CCD drive circuit and a detection processor. With the application of frontlighting with fixed installation, the light from the light source is respectively received by the left and right detection sensors through the two sides of the test strip. When the test strip is in the left-right shift, the sensitized pixel of the linear array CCD produces changes corresponding to the edge of the strip and outputs the corresponding signals of the edge of the strip. And the signals are respectively sent to the detection processor and the CPC controller respectively arranged in the left and right sides to be calculated in subtraction, so that the device can judge whether the position of the strip deviates from the centerline of the unit and the distance of the deviation. The device has characteristics of high detection accuracy, wide detection range, quick response speed, great stability and great capacity of resisting disturbance.
Description
Technical field
The utility model belongs to field of photoelectric technology, relates to a kind of pick-up unit, is specifically related to a kind of band automatic centering pick-up unit based on CCD.
Background technology
CPC (Centre Position Control) system is the abbreviation of band automatic centering system, and its effect is to make the band automatic deviation correction, keeps the band center constant, is positioned at band all the time and produces on the unit center line of unit.In the production run of band, because: (1) incoming band furls uneven or there is camber in the roll coil of strip; (2) axis between the live-roller is not parallel, with band traffic direction out of plumb; (3) the live-roller surface is not cylindrical, perhaps profile decentraction symmetry and surface working defective; (4) the even own band defective of band uneven distribution; (5) strap tension is inhomogeneous; (6) owing to make moist, heat, the tractive force sudden change causes the distortion of machinery and band; (7) wear and tear in machines etc. all can cause band to depart from the unit center line.Therefore, the band production line generally all must be provided with deviation correction control system, promptly so-called centering control CPC system or marginal position control EPC (Edge Position Control) system.Adopt deviation correction control system can make the band location, avoid that the band sideslip is excessive to be broken equipment or cause broken belt to stop production, owing to realized that the automatic volume of band is neat, can be next process neat coiled material is provided simultaneously, thereby reduce the side cut amount of band in a large number, improve yield rate.At present, the detecting sensor of the CPC/EPC of automatic centering system has three types of inductance type, condenser type and photo-electrics.
What the inductance type detecting sensor adopted is electromagnetic induction principle, can only be applicable to the magnetic conductive metal band; The installation requirement of capacitive transducer is higher, sensor output signal a little less than, accuracy of detection is low; It mainly is to utilize sensor devices that the photo-electric detecting sensor detects principle, and light signal is become electric signal, can be divided into three kinds again:
First kind: pick-up unit adopts visible light, high frequency visible light, infrared light as light source, utilize single photodiode, photosensitive triode, photoresistance or photoelectric cell as sensor devices, the light that utilizes lens that light source is sent on the light path projects on the sensor devices, when band moves, illumination on the sensor devices is sent the variation relevant with the band movement law, and send corresponding electric signal, utilize this signal can obtain the position of band.Owing to adopt single sensor devices receiving optical signals, for guaranteeing measuring accuracy, the measurement range of pick-up unit is limited.Strip material with different width correction for requiring on the production line must rely on manually or the installation site of motorized adjustment detecting sensor, just can implement the band automatic deviation correction to be adjusted to measure in the effective range.The detection effective range of this pick-up unit is less.
Second kind: pick-up unit adopts visible light as light source, utilizes beam coupling device CCD as sensor devices, adopts the mode of reverse side irradiation, and light source and CCD detection head are positioned at band the same side.The light beam that light source sends is after cylindrical lens converges, form a high brightness, the uniform parallel beam planar projective of illumination is to tested strip surface, the bright band that drops down onto the band outside is sponged by ground blacking layer or the coal seam that scatters, and the bright band of falling on the band is imaged on the line array CCD photosurface after the band reflection.Like this, the boundary of last clear zone of CCD and dark space enters subsequent process circuit corresponding to the edge of band through collection.This detection is subjected to the influence of strip surface smooth finish very big, if the strip surface reflective is good, then Fan She light intensity is just strong, if band is contaminated or reflective is bad, then through the light intensity of band reflection just a little less than, pollute seriously more, the light intensity of reflection is weak more, adjust CCD induction light intensity how fast, reasonably, reducing until eliminating CCD supersaturation probability is the more scabrous problem of this pick-up unit.
The third: detection system adopts the mode of front illuminated, and light source and CCD camera are positioned at the band both sides.Use two CCD cameras to measure.Two edges of band are aimed in the optical center of camera, and two cameras link to each other with leading screw.When strip width changes,, make the centre distance of two cameras consistent with strip width by shaking leading screw.In the testing process, with the calculating that subtracts of the measured value of two cameras, according to the numerical value and the symbol that calculate, the side-play amount of band and offset direction as can be known.
More than the Lights sections of three kinds of photodetector systems, adopt visible light or high frequency visible light more.But inevitably have natural light, workshop illumination, overhead traveling crane car light or the like a series of jamming light source in the band production scene, the anti-interference ability that how to improve detection system also is a key issue that will solve.
Summary of the invention
In order to solve the defective that existing photo-electric detection system is subject to ambient light interference and sensing range is limited, accuracy of detection is low, the purpose of this utility model is to provide a kind of band automatic centering CPC pick-up unit based on CCD, the accuracy of detection height of this pick-up unit, sensing range is wide, response speed is fast, anti-interference is stronger, installation, easy and simple to handle.
The technical scheme that the utility model adopted is, a kind of band automatic centering CPC pick-up unit based on CCD, comprise light source and detecting sensor, detected band is between light source and detecting sensor, light source is the rectangular array that the infrared diode of 700～900nm wavelength is formed, detecting sensor comprises left side detecting sensor and the right side detecting sensor that detects position, band both sides of the edge respectively, the left side detecting sensor is identical with right side detecting sensor structure, comprise camera lens respectively, laser alignment device and line array CCD, be provided with narrow band pass filter between camera lens and the line array CCD, also comprise the CCD driving circuit and the measurement processor that drive line array CCD.
The utility model has the advantages that: the accuracy of detection height
, sensing range is wide, and response speed is fast, is not subjected to the influence of variable in distance between band and the detecting sensor, the influence that not changed by strip width, strong interference immunity, simple in structure, installation, easy and simple to handle is easy to safeguard and debugging.
Description of drawings
Fig. 1 is that CPC detection system of the present utility model detects schematic diagram;
Fig. 2 is the circuit block diagram of the utility model detection system;
Fig. 3 is the circuit block diagram of measurement processor in the utility model.
Among the figure, 1. left side detecting sensor, 2. right side detecting sensor, 3. band, 4. infrared light supply.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is elaborated.
Pick-up unit of the present utility model adopts fixed installation front illuminated formula, infrared light supply 4 and detecting sensor are arranged on the two ends of detected band 3, the rectangular array that light source 4 adopts the infrared diode of 700～900nm wavelength to form has light stability, long service life, easy characteristics of installing.Detecting sensor is divided into left side detecting sensor 1 and the right side detecting sensor 2 that detects position, band 3 both sides of the edge respectively, left side detecting sensor 1 is identical with right side detecting sensor 2 structures, comprises camera lens, narrow band pass filter, line array CCD, CCD driving circuit, measurement processor.
This pick-up unit adopts beam coupling device line array CCD as sensor devices, the light that light source 4 sends by lens focus to the sensor devices line array CCD, because the spectrum induction range of line array CCD is 300～1100nm, visible light in still can induced environment, interference for filtering environmental light, this pick-up unit is added with narrow band pass filter between camera lens and line array CCD device, thereby make this device can only respond to the infrared light of the specific wavelength that light source 4 sends, on detecting sensor, set up simultaneously the laser alignment device, make detecting sensor can aim at simply fast, thereby can drop into steering operation fast with light source.
As shown in Figure 1, detected band 3 is between infrared light supply 4 and detecting sensor, adopting wavelength is that the rectangular array formed of the infrared diode of 700～900nm is as the detection system light source, adopt left side detecting sensor 1 and right side detecting sensor 2 to detect position, band 3 both sides of the edge respectively, the address of left side detecting sensor 1 is No. 1, and the address of right side detecting sensor 2 is No. 2.Because be added with narrow band pass filter between line array CCD and the camera lens, the infrared light that ordinary ambient light and light source send all can enter camera lens, but the infrared light that narrow band pass filter can only send by light source 4.Infrared light supply 4 is parallel when upwards shining, and the infrared light that is blocked by band 3 does not enter line array CCD, therefore is revealed as the dark space on the corresponding sensitization pixel of line array CCD, otherwise, be bright district, so bright-dark cut is the marginal position of band 3 on the line array CCD.If line array CCD sensitization pixel is sensed infrared light, then high level is exported in CCD respective point position; Blocked by band 3 as if infrared light, then output low level.As long as the scope that band 3 departs from the unit center line is in 0～500mm, detection head all can correctly detect the distance that departs from.
Because the variation of distance can be reflected on left side detecting sensor 1 and the right side detecting sensor 2 simultaneously between band 3 and the detecting sensor, and output signal is complementary, so the variation of distance can not influence the detection of band center between band 3 and the detecting sensor.Simultaneously, this detection method has also compensated the influence that the strip width variation detects the band center automatically.
Fig. 2 is the circuit block diagram of pick-up unit of the present invention, and left-hand broken line partly is a detecting sensor 1, and the right side dotted portion is a detecting sensor 2.Total system is a closed-loop system, and detecting sensor reflection band 3 departs from the distance of unit center line, passes to the CPC controller by the RS485 bus, and the controller drives hydraulic system is adjusted the position of band 3, reaches the correction purpose.
The position at band center is admitted to the CPC controller by RS485, according to band center skew controlled hydraulic system, drives adjusting deviation device by the CPC controller, and band is positioned on the unit center line all the time.Whole detection and control procedure all adopt digital signal processing, comprise that ccd signal processing, the transmission of strip edge signal, system calibrating, position servo control, parameter are provided with demonstration etc., have the accuracy of detection height, sensing range is wide, response speed is fast, good stability, characteristics that antijamming capability is strong.
Fig. 3 is the circuit block diagram of measurement processor, and dotted portion is finished in CPLD; Uo, SP, FC are the signals that the CCD chip is exported to subsequent conditioning circuit, and the threshold value of binary conversion treatment circuit input circuit can be regulated by the programming of STC 6 Single-chip Controlling programmable resistances.
CPC centering control system workflow: at first, the CCD driving circuit of the left and right sides drives the line array CCD operate as normal; The second, left and right sides measurement processor is handled the signal of CCD output, writes down the marginal point position information of the band left and right sides respectively; The 3rd, send the marginal point position of both sides to the CPC controller by R S485 bus; The 4th, after controller receives the some position information of both sides, calculate the distance of band 3 misalignment unit center lines according to computing formula; At last, thus drive the correction that hydraulic system realizes band according to the distance of departing from of calculating.
The utility model is applicable to that coil diameter such as strip uncoiler changes greatly, the band height change greatly, strip width variation CPC position probing and control (dual detection sensor) greatly, or EPC position probing and the control (single detecting sensor) of band height change when little.
Claims (1)
1. band automatic centering CPC pick-up unit based on CCD, comprise light source and detecting sensor, it is characterized in that, detected band (3) is positioned between described light source (4) and the detecting sensor, described light source (4) is the rectangular array that the infrared diode of 700～900nm wavelength is formed, described detecting sensor comprises left side detecting sensor (1) and the right side detecting sensor (2) that detects band (3) position, both sides of the edge respectively, described left side detecting sensor (1) is identical with right side detecting sensor (2) structure, comprise camera lens respectively, laser alignment device and line array CCD, be provided with narrow band pass filter between camera lens and the line array CCD, also comprise the CCD driving circuit and the measurement processor that drive line array CCD.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200312278U CN201004009Y (en) | 2007-02-12 | 2007-02-12 | Belt material automatic centering CPC detection device based on CCD |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200312278U CN201004009Y (en) | 2007-02-12 | 2007-02-12 | Belt material automatic centering CPC detection device based on CCD |
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| Publication Number | Publication Date |
|---|---|
| CN201004009Y true CN201004009Y (en) | 2008-01-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNU2007200312278U Expired - Lifetime CN201004009Y (en) | 2007-02-12 | 2007-02-12 | Belt material automatic centering CPC detection device based on CCD |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103130005A (en) * | 2013-02-25 | 2013-06-05 | 西安理工大学 | Strip self-centering detecting method based on infrared ray |
| CN108286935A (en) * | 2017-01-09 | 2018-07-17 | 王淑琪 | Fixed centering rectification sensor |
| CN108955522A (en) * | 2018-06-29 | 2018-12-07 | 西安理工大学 | Device for measuring place of strip material and method |
| CN112857226A (en) * | 2021-01-25 | 2021-05-28 | 常州机电职业技术学院 | Photoelectric deviation-rectifying detection sensor with linear output |
-
2007
- 2007-02-12 CN CNU2007200312278U patent/CN201004009Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103130005A (en) * | 2013-02-25 | 2013-06-05 | 西安理工大学 | Strip self-centering detecting method based on infrared ray |
| CN108286935A (en) * | 2017-01-09 | 2018-07-17 | 王淑琪 | Fixed centering rectification sensor |
| CN108286935B (en) * | 2017-01-09 | 2023-04-07 | 王淑琪 | Fixed centering deviation-rectifying sensor |
| CN108955522A (en) * | 2018-06-29 | 2018-12-07 | 西安理工大学 | Device for measuring place of strip material and method |
| CN112857226A (en) * | 2021-01-25 | 2021-05-28 | 常州机电职业技术学院 | Photoelectric deviation-rectifying detection sensor with linear output |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20080109 |
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| CX01 | Expiry of patent term |