CN109692822A - A kind of laser material separation device and method - Google Patents
A kind of laser material separation device and method Download PDFInfo
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- CN109692822A CN109692822A CN201910186007.XA CN201910186007A CN109692822A CN 109692822 A CN109692822 A CN 109692822A CN 201910186007 A CN201910186007 A CN 201910186007A CN 109692822 A CN109692822 A CN 109692822A
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- 239000000463 material Substances 0.000 title claims abstract description 107
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000000926 separation method Methods 0.000 title claims abstract description 25
- 238000001514 detection method Methods 0.000 claims abstract description 47
- 238000009434 installation Methods 0.000 claims abstract description 44
- 238000012216 screening Methods 0.000 claims abstract description 43
- 239000012535 impurity Substances 0.000 claims abstract description 18
- 230000000505 pernicious effect Effects 0.000 claims abstract description 16
- 238000005286 illumination Methods 0.000 claims abstract description 15
- 238000004364 calculation method Methods 0.000 claims abstract description 13
- 230000008569 process Effects 0.000 claims abstract description 13
- 239000002245 particle Substances 0.000 claims abstract description 12
- 230000004927 fusion Effects 0.000 claims abstract description 8
- 239000007921 spray Substances 0.000 claims description 11
- 238000002310 reflectometry Methods 0.000 claims description 9
- 238000003384 imaging method Methods 0.000 claims description 6
- 239000013307 optical fiber Substances 0.000 claims description 5
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 230000009977 dual effect Effects 0.000 claims description 4
- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 3
- 229910052738 indium Inorganic materials 0.000 claims description 3
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 claims description 3
- 239000002356 single layer Substances 0.000 claims description 3
- 230000000747 cardiac effect Effects 0.000 claims 1
- 238000012545 processing Methods 0.000 description 14
- 235000013339 cereals Nutrition 0.000 description 10
- 241000209094 Oryza Species 0.000 description 9
- 235000007164 Oryza sativa Nutrition 0.000 description 9
- 235000009566 rice Nutrition 0.000 description 9
- 239000004033 plastic Substances 0.000 description 6
- 229920003023 plastic Polymers 0.000 description 6
- 239000011521 glass Substances 0.000 description 5
- 239000004575 stone Substances 0.000 description 5
- 239000000919 ceramic Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 235000013305 food Nutrition 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000010606 normalization Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 230000009885 systemic effect Effects 0.000 description 1
- 235000013311 vegetables Nutrition 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/34—Sorting according to other particular properties
- B07C5/342—Sorting according to other particular properties according to optical properties, e.g. colour
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/36—Sorting apparatus characterised by the means used for distribution
- B07C5/363—Sorting apparatus characterised by the means used for distribution by means of air
- B07C5/365—Sorting apparatus characterised by the means used for distribution by means of air using a single separation means
Landscapes
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
- Sorting Of Articles (AREA)
Abstract
The invention discloses a kind of laser material separation device and methods, it is characterised in that: including laser identification system, visible light identifying system and sorting execution system；Wherein, laser identification system includes laser light source and laser camera；It is screening installation detection zone between slide plate and material demarcation plate；Laser light source, LED illumination lamp is irradiated detection zone material, laser light source forms a strip light belt by laser beam expanding and in screening installation detection zone, laser camera reflects material, the laser of scattering carries out Image Acquisition and calculation process, visible light identifying system reflects material by Visible Light Camera, the visible light of scattering carries out Image Acquisition and calculation process, the identification signal of gas puff Z-pinch system while reception from laser identification system and visible light identifying system carries out fusion and is uniformly processed, and export that stroke signal effectively rejects little particle foreign matter to air-jet device and material is homochromy, same density, the all close pernicious impurity of shape size.
Description
Technical field
The invention belongs to food processing, industrial goods to process relevant sorting technology field, and in particular to a kind of laser material
Screening installation and method.
Background technique
It improves with the continuous development of science and technology, the screening installation based on photoelectric technology is widely used in grain, tealeaves, vegetable
The processing of the agricultural product such as dish, nut and plastics, the processing of the industrial goods such as ore can be identified quickly and effectively and reject change
Matter material and various foreign matters, significantly improve final product quality, substantial saved labour, and social benefit is obvious.
Currently, the photometric sorting equipment of mainstream is based primarily upon visible light identifying system, including visible light source and corresponding
Visible Light Camera, can substantially meet basic color sorting requirement, but for being connect with material color, density, granular size etc.
Close impurity, traditional technology are then difficult to, or even cannot be identified.
The new type light source that laser is good as a kind of monochromaticjty, strong directionality, energy density is concentrated, available spectrum range is wide,
It is gradually introduced screening installation field.Through retrieving, such as entitled " the Method for of United States Patent (USP) US9296019B2
discerning and sorting products whereby the concentration of a component of
These products is determined " discloses a kind of method for separating, and laser beam is directed at a high speed and revolved by this method
Turn polygonal mirror, laser beam reflected after equipment detection zone formed a dynamic scan line.Material is by laser
While Shu Zhaoliang, the reflected light on surface is led through polygonal mirror backtracking, then by the intermediate porose reflecting mirror of one side
Enter in photomultiplier tube to obtain signal.
Chinese patent application CN201010508538 discloses a kind of laser material sorting device, and the device is different by multiple groups
The laser of long wavelength laser output carries out closing Shu Houzai output, is formed and is scanned in detection zone by rotatable polygonal mirror
Line, the scattering light after material is illuminated respectively enter corresponding photoelectric sensing through polygonal mirror backtracking, then by beam splitting arrangement
In device.
The sorting material method of above-mentioned patent disclosure, laser are mainly limited to laser beam and pass through in the application in sorting field
Reflecting rotating multisurface mirror forms scan line, and the method for then acquiring reflection signal by photomultiplier tube, this method passes through photoelectricity
Pipe imaging, therefore spatial resolution is very low, it is difficult to it identifies and rejects the foreign matter in small particles material, such as be difficult to reject in rice
Moldy kernel, deep yellow grain, pale yellow grain etc., especially with the pernicious impurity that rice is homochromy, same to density, shape size are all close, than
Such as colored stone head, plastics, ceramics, glass etc..
Moreover, because polygonal mirror revolving speed is very high, usually at tens of thousands of turns or more per minute, not only cost is high, and deposits
It is short in bearing life, it is easy to because of the problems such as abrasion causes equipment fault.
Summary of the invention
The problem to be solved in the present invention is sorting problem of the existing material separation device to little particle foreign matter, especially rice
In moldy kernel, deep yellow grain, pale yellow grain etc. and be difficult to point with rice is homochromy, same to density, shape size are all close pernicious impurity
The problem of selecting provides a kind of laser material separation device and method, passes through the double of laser identification system and visible light identifying system
It sorts again, i.e., effectively rejects customary impurities, can also effectively reject other homochromy with material, pernicious impurity with density, raising is set
Standby material sorts range, sorts ability.
In order to solve the above technical problems, the technical solution adopted by the present invention is that: a kind of laser material separation device, feature
It is: including laser identification system, visible light identifying system and sorting execution system；
Wherein, the laser identification system includes laser light source and laser camera；
The visible light identifying system includes Visible Light Camera, LED illumination lamp, background board；
The sorting execution system includes oscillating feeder, slide plate, air-jet device and gas puff Z-pinch system, material demarcation plate；
It is screening installation detection zone between the slide plate and material demarcation plate；The laser identification system and visible light identification are
System is connect with gas puff Z-pinch system respectively；
The laser light source includes laser generator, optical fiber, lens；The laser light source issues laser by laser generator and passes through
Fiber coupling, by laser beam expanding, forms a strip light belt in screening installation detection zone to lens.
Preferably, the laser identification system, visible light identifying system can be separately positioned on screening installation detection zone
Two sides.
Preferably, the strip light belt can provide illumination for one or more laser camera.
Preferably, it is 1400nm ~ 1600nm that the laser generator, which issues laser center wavelength,.
Preferably, the laser camera is indium gallium arsenic (InGaAs) line array sensor sensitive to infrared band.
Preferably, the gas puff Z-pinch system is connect with air-jet device, the air-jet device includes electromagnetism spray valve, spray
Mouth.
Preferably, the laser identification system, visible light identifying system and execution system can laterally place multiple groups side by side.
A kind of laser material method for separating, it is characterised in that: in above-mentioned laser material separation device,
1) sorting execution system is made of screening installation detection zone slide plate and material demarcation plate, and oscillating feeder is by sorted materials
It is uniformly spread out on slide plate, forms single layer material and pass through screening installation detection zone；
2) laser identification system is irradiated detection zone material by laser light source, LED illumination lamp, and laser light source is by laser
It expands and forms a strip light belt in screening installation detection zone, laser camera reflects material, the laser of scattering carries out
Image Acquisition and calculation process, laser camera distinguish foreign matter according to difference in reflectivity of the material to laser, and by identification signal
It is transmitted to gas puff Z-pinch system；
3) visible light identifying system is carried out at Image Acquisition and operation by visible light of the Visible Light Camera to material reflection, scattering
Reason, background board provide imaging background for Visible Light Camera, it is seen that light camera is according to material to the difference in reflectivity area of visible light
Foreign matter is separated, and identification signal is transmitted to gas puff Z-pinch system；
4) above-mentioned laser identification system, visible light identifying system carry out dual identification sorting to material simultaneously, and by identification signal
It is transmitted to gas puff Z-pinch system, gas puff Z-pinch system receives the identification from laser identification system and visible light identifying system simultaneously
Signal carries out fusion and is uniformly processed, and exports stroke signal to air-jet device；
5) the electromagnetism spray valve of above-mentioned air-jet device receives stroke signal and ejects high pressure gas pulse, in screening installation detection zone
Domain, the pernicious impurity that nozzle rejects little particle foreign matter and material is homochromy, same to density, shape size are all close.
The advantages and positive effects of the present invention are:
1, laser material separation device of the present invention by laser identification system and visible light identifying system combine closely carry out it is double
Again identification sorting, have the characteristics that sort range extensively, high resolution, not only can effectively reject conventional foreign matter, can also be into one
Step rejects the little particle foreign matter that conventional method is difficult to, and when being applied to rice sorting, not only can effectively reject in rice
Moldy kernel, deep yellow grain, pale yellow grain etc., can also reject and that rice is homochromy, same to density, shape size are all close is pernicious miscellaneous
Matter, such as homochromy stone, plastics, ceramics, glass etc. have greatly ensured food processing safety.
2, laser material separation device of the present invention passes through laser due to using laser identification system, visible light identifying system
Light source, LED illumination lamp are irradiated detection zone material, and laser beam expanding is formed a strip light belt by laser light source, swash
Light camera reflects material, the laser of scattering carries out Image Acquisition and calculation process, it is seen that light camera reflects material, scattering
Visible light carries out Image Acquisition and calculation process, and laser identification system, visible light identifying system are respectively according to material to visible light
Difference in reflectivity distinguish foreign matter, gas puff Z-pinch system is received simultaneously from laser identification system and visible light identifying system
Identification signal carries out fusion and is uniformly processed, and exports stroke signal, carries out dual identification sorting to material, it is seen that light identifying system
Identification sorts conventional foreign matter, and laser identification system rejects the little particle foreign matter being difficult to, and discrimination efficiency is high, separation performance and effect
Fruit is good, and it is low to solve existing screening installation resolution ratio, it is difficult to reject the little particle foreign matter problem that conventional method is difficult to.
3, the laser generator sending laser center wavelength that laser material separation device of the present invention uses is very narrow, passes through optical fiber
Lens are coupled to by laser beam expanding, form a strip light belt in screening installation detection zone, strip light belt can be one
Or more laser cameras provide illumination, while can not only reduce cost to avoid the narrow logical filter in installation laser camera, also increase
Strong brightness of image；Since the SPECTRAL DIVERSITY that laser identification system and visible light identifying system use is very big, do not have between each other
Interference effectively prevents opening the problem of influencing conventional recognition performance after laser identification system.
4, the laser center wavelength 1450nm that the laser generator that laser material separation device of the present invention uses issues is water
Divide a strong absorption peak near short infrared wave band, the moisture contained in material can absorb the light of this wave band strongly.
In food processing field, sorted materials all contain certain moisture, and the pernicious impurity such as stone close with material color, density,
Usual all moisture-frees such as plastics, ceramics, glass.Using this characteristic, the laser signal intensity of pernicious impurity reflection can be obvious
It is larger, then the signal is received by laser camera and is imaged, by the image processing algorithm of profession, it can be very good to identify and pick
Except these pernicious impurity.
5, laser material separation device of the present invention is due to laser light source, LED illumination lamp, laser light source by fiber coupling extremely
Laser beam expanding is formed a strip light belt by lens, and laser camera, Visible Light Camera are respectively to the laser of material reflection, scattering
Image Acquisition and calculation process are carried out, identification signal is exported, existing screening installation is avoided to use machinery rotating type polygonal mirror
It is thicker to generate laser beam, the low problem of resolution ratio solves the problems, such as that existing equipment is appropriate only for identification sorting large granular materials, spray
The identification signal of gas control system while reception from laser identification system and visible light identifying system carries out fusion and is uniformly processed,
And stroke signal is exported to air-jet device, while nozzle rejects little particle foreign matter and material is homochromy, same to density, shape size all connect
The advantages that close pernicious impurity, equipment have structure simple, and stability is high, high resolution, it is raw to be very suitable to industrial mass
It produces.
Detailed description of the invention
Fig. 1 is a kind of one structural schematic diagram of embodiment of laser material separation device of the present invention；
Fig. 2 is a kind of schematic diagram of the laser light source internal structure of laser material separation device of the present invention；
Fig. 3 is a kind of two structural schematic diagram of embodiment of laser material separation device of the present invention；
1-material, 2-slide plates, 3-oscillating feeders, 4-laser cameras, 5-laser light sources, 6-Visible Light Cameras, 7-back
Scape plate, 8-LED illumination lamps, 9-material demarcation plates, 10- air-jet device, 11-gas puff Z-pinch systems, 12- electromagnetism spray valve, 13-
Nozzle, 14-laser generators, 15-optical fiber, 16-lens, 17-strip light belts, the actually detected line of 18-laser cameras.
Specific embodiment
In order to better understand the present invention, the present invention is further retouched with attached drawing combined with specific embodiments below
It states.
As shown in Figure 1, 2, 3, the present invention provides a kind of laser material separation device and method, mainly wraps in the screening installation
Laser identification system, visible light identifying system and sorting execution system are included, laser identification system and visible light identifying system are distinguished
It is connect with sorting execution system.
Laser identification system is made of laser light source 5 and laser camera 4；Visible light identifying system by Visible Light Camera 6,
LED illumination lamp 8, background board 7 are constituted；Execution system is sorted by oscillating feeder 3, slide plate 2, air-jet device 10, material demarcation plate 9
It constitutes.Laser camera 4, Visible Light Camera 6 are connect with gas puff Z-pinch system 11 respectively.Oscillating feeder 3 is arranged on slide plate 2
It is square, material demarcation plate 9 is set below slide plate 2, is screening installation detection zone between slide plate 2 and material demarcation plate 9.
Embodiment one
Such as Fig. 1, on front side of the screening installation detection zone between slide plate 2 and material demarcation plate 9, a set of laser identification system and can
Light-exposed identifying system is respectively toward to screening installation detection zone, and oscillating feeder 3 and slide plate 2 uniformly spread out material 1, is formed single
Layer material passes through screening installation detection zone.
On front side of screening installation detection zone, laser light source 5 and LED illumination lamp 8 are irradiated the material 1 of detection zone,
Laser light source 5 forms a strip light belt 17 by laser beam expanding and in screening installation detection zone, and laser camera 4 is to material 1
Reflection, scattering laser carry out Image Acquisition and calculation process, reflectivity of the laser camera 4 according to material 1 to laser, transmissivity
Difference distinguishes foreign matter, and identification signal is transmitted to gas puff Z-pinch system 11；Similarly, it is seen that light identifying system passes through visible light
Camera 6 reflects material 1, the visible light of scattering carries out Image Acquisition and calculation process, and background board 7 is that Visible Light Camera 6 provides
Imaging background, it is seen that light camera 6 distinguishes foreign matter to the reflectivity of visible light, transmission difference according to material 1, and will identification
Signal is transmitted to gas puff Z-pinch system 11.
Laser identification system, visible light identifying system carry out dual identification sorting to material 1 simultaneously, and identification signal is passed
Gas puff Z-pinch system 11 is transported to, gas puff Z-pinch system 11 receives the knowledge from laser identification system and visible light identifying system simultaneously
Level signal carry out fusion be uniformly processed, and to the signal carry out delay time adjustment, with guarantee to strike just foreign matter center with
Ratio of sorting and cleaning, output stroke signal to air-jet device 10 are improved, the electromagnetism spray valve 12 of air-jet device 10 receives stroke signal and ejects
High pressure gas pulse, in screening installation detection zone, nozzle 13 rejects conventional little particle foreign matter and material 1 is homochromy, same to density, shape
The all close pernicious impurity of shape size.Such as reject moldy kernel in rice, deep yellow grain, pale yellow grain and homochromy stone, plastics, pottery
Porcelain, glass etc..
Such as Fig. 2, laser generator 14 generates laser, and optical fiber 15 is coupled to 16 groups of lens 16 or lens for laser beam expanding,
Screening installation detection zone forms a strip light belt 17 and provides laser lighting for two laser cameras.
The laser center wavelength that laser light source 5 is chosen is 1450nm or 1550nm.Laser center wavelength 1450nm and
1550nm is two strong absorption peaks of the moisture near short infrared wave band, and the moisture contained in material 1 can absorb this strongly
The light of one wave band.In food processing field, sorted materials 1 all contain certain moisture, and the evil close with 1 color of material, density
Property usually all moisture-free such as impurity such as stone, plastics, ceramics, glass.Using this characteristic, the laser letter of pernicious impurity reflection
Number intensity can be significantly greater, then receives the signal by laser camera 4 and be imaged, can be compared with by the image processing algorithm of profession
It identifies well and rejects these pernicious impurity.
16 groups of lens 16 or lens inside laser light source 5 can use Bao Weier lens 16 or 16 groups of lens, to reach
More evenly expand effect.The strip light belt 17 formed after laser beam expanding in detection zone, width take 10-30mm, length
It can be required according to different structure, take 250 ~ 750mm.The light belt can be showed in detection zone using dedicated target sheet.
The power of laser generator 14 is adjustable within the scope of 0 ~ 1.5W.
Laser camera 4 uses indium gallium arsenic (InGaAs) line array sensor sensitive to infrared band, the sensitivity of the sensor
Wave band is in 900 ~ 1700nm, since it is insensitive to visible light wave range, can work at the same time with visible light identifying system, phase
It is interference-free between mutually.
Laser camera 4 sweeps sample frequency using the row of 3 ~ 6kHz, since material 1 is usually in detection zone gliding speed
4m/s, corresponding vertical direction resolution ratio is about 0.7 ~ 1.3mm, can effectively identify the pernicious impurity close with the grain of rice.
Laser camera 4 uses resolution ratio for the line array sensor of 512 or 256 pixels, the actually detected line 18 of laser camera
Width is chosen for 300mm, then corresponding horizontal direction resolution ratio is about 0.6 ~ 1.2mm.
The emission type that LED illumination lamp 8 is taken is the combination of white light, blue light, infrared light.
Visible Light Camera 6 selects photoelectric coupling (CCD) line array sensor or complementary metal oxide semiconductor (CMOS) line
Array sensor can choose monochrome sensor or color sensor further according to the requirement of sorted materials 1.
Self-control can be used in laser camera 4, Visible Light Camera 6.Self-control laser camera 4, self-control Visible Light Camera 6 are internally integrated
At a high speed, large-scale F PGA programmable gate array chip, to meet requirement of the image processing algorithm to real-time.Also,
The fpga chip can also provide driver' s timing letter using surplus resources in piece for line array sensor and camera AD conversion chip
Number.
Laser camera 4 uses line array sensor, and by lens imaging, exposure can collect material 1 in detection zone every time
A piece uniline image of the fixed position in domain.Laser camera 4 is exposed by continuously high frequency time, usually up to per second thousands of
It is secondary, it can continuously collect the image line by line of screening installation detection zone.Using image processing algorithm, will acquire
Uniline image is stored in the memory of Arithmetic Processing Chip, after image reaches the size of needs, each collected newest one
Row image data can replace oldest data line, to maintain the currently active figure of a width constant magnitude in memory always
Picture provides data basis for the analysis processing of next step.
Laser material method for separating is to use dedicated image processing algorithm by laser camera 4, Visible Light Camera 6, first
The parameter first inputted according to user, the reflection of material 1 analyzed in conjunction with lot of experimental data, transmissison characteristic generate several big
The small standard picture template for M × N, further, compared with this template is carried out pixel-by-pixel with the image that camera acquires, if with
Template matching degree is more than 50% then to set set in a program, otherwise sets reset, it is hereby achieved that one secondary " 0 ", " 1 " are dot matrixed
Identification signal array, then the identification signal is transmitted to gas puff Z-pinch system 11.
The working principle of laser material sorting, laser identification system can obtain homochromy, with density foreign matter according to image
Identification signal.By similar methods, it is seen that the identification signal of the available conventional foreign matter of light identifying system.Gas puff Z-pinch system
11 receive the identification signal from laser identification system and visible light identifying system, the software operation of gas puff Z-pinch system 11 simultaneously
Two kinds of identification signals are fused into unified identification signal, the software of gas puff Z-pinch system 11 carries out delay time tune to the signal
It is whole, to guarantee to hit foreign matter center just, further the stroke signal is amplified, and exports to air-jet device 10,
The electromagnetism spray valve 12 of air-jet device 10 is opened, and nozzle 13 is by little particle foreign body eliminating.
To reach better sorting result, the image obtained to laser camera 4 is handled, and calculation is normalized first
Method, to eliminate the systemic image deviations of the introducings such as laser linear array sensor, camera lens, optical path.
It when equipment is switched on every time, is stopped working by procedure auto-control oscillating feeder 3, the several seconds is waited, to equipment
After stabilization, 4 continuous exposure of procedure auto-control laser camera collects more single line of data, then is spelled in memory by software
It is connected in a secondary still image, it is assumed that the image lateral resolution indicates that image line number is indicated with J with N, then the width image can be with
It is expressed as, wherein U is the brightness value of each pixel in image, and j is line number, and n is row number.Preferably, N value is 512 pictures
Element, J value are 5000 rows.
Then, it averages to column data each in image, available one group of row data, the as background of system
Brightness value:
Then, program automatically saves the background brightness value, and opens oscillating feeder 3 into normal operating conditions.Hereafter, for
The new data of the collected every a line of laser camera 4Following operation is done, result is obtained:
WhereinIt is rightIt is averaging obtained average value.
Finally by generalIt is compared with the threshold of sensitivity that user gives, further obtains identification signal.
The single line of data obtained by normalization algorithm, most of systematic bias as caused by equipment is eliminated, is made
Image consistency is obtained to greatly improve.Preferably, newest 32 row single line of data is further used, it is spliced into width cross
It is 512 pixels to resolution ratio, longitudinal resolution is the image of 32 pixels.After new data line reaches, program can be replaced automatically
Change data line oldest in image, the secondary new image of regeneration one.
Since the time interval between the every two rows data of laser camera 4 is very short, about tens of to hundreds of microseconds, therefore this
Equipment is in laser camera 4 using high speed FPGA(programmable gate array) chip realizes image processing algorithm, to meet
The requirement of real-time of algorithm.
Embodiment two
Such as Fig. 3, in screening installation, on front side of screening installation detection zone, a set of laser identification system and visible light identifying system
It is respectively toward to screening installation detection zone, screening installation detection zone rear side, adds a set of laser identification system and visible light is known
Other system is respectively toward to screening installation detection zone.
Detection zone material 1 is shone with rear side, laser light source 5 and LED illumination lamp 8 on front side of screening installation detection zone
It penetrates, laser light source 5 forms a strip light belt 17 by laser beam expanding and in screening installation detection zone, and laser camera 4 is to object
1 reflection of material, scattering laser carry out Image Acquisition and calculation process, laser camera 4 according to material 1 to the reflectivity of laser, thoroughly
The rate difference of penetrating distinguishes foreign matter, and identification signal is transmitted to gas puff Z-pinch system 11；Visible light identifying system passes through visible light
Camera 6 reflects material 1, the visible light of scattering carries out Image Acquisition and calculation process, and background board 7 is that Visible Light Camera 6 provides
Imaging background, it is seen that light camera 6 distinguishes foreign matter to the reflectivity of visible light, transmission difference according to material 1, and will identification
Signal is transmitted to gas puff Z-pinch system 11.
The reception simultaneously of gas puff Z-pinch system 11 comes from screening installation detection zone two sets of forward and backward side laser identification system and can
The identification signal of light-exposed identifying system carries out fusion and is uniformly processed, i.e. the 2 of screening installation detection zone front and rear sides laser phase
The identification signal that machine and 2 Visible Light Camera separated image acquisitions and calculation process obtain carries out fusion and is uniformly processed, and to this
Signal carries out delay time adjustment, it is ensured that can strike foreign matter center and improve ratio of sorting and cleaning, output stroke signal to air-jet device 10, spray
The electromagnetism spray valve 12 of device of air 10 receives stroke signal and ejects high pressure gas pulse, in screening installation detection zone, nozzle 13
Reject conventional little particle foreign matter and material 1 is homochromy, same to density, shape size are all close pernicious impurity.
It is directed to different materials in actual operation, can also only increase multiple laser light sources 5, not increase laser camera 4,
To promote recognition effect.Background board 7 in visible light identifying system, is generally configured with dedicated 7 headlamp of background board, and sorting executes
Material demarcation plate 9 in system generally falls into a part of screening installation splicing pan dress, cannot be not explain in detail in this patent
The structure of receiving hopper is stated, and is interpreted as the limitation to the scope of this patent.
The embodiments of the present invention have been described in detail above, but content is only the preferred embodiment of the present invention,
It should not be considered as limiting the scope of the invention.All changes and improvements made in accordance with the scope of the present invention, should all
It still belongs within this patent covering scope.
Claims (8)
1. a kind of laser material separation device, it is characterised in that: including laser identification system, visible light identifying system and sorting
Execution system；
Wherein, the laser identification system includes laser light source and laser camera；
The visible light identifying system includes Visible Light Camera, LED illumination lamp, background board；
The sorting execution system includes oscillating feeder, slide plate, air-jet device and gas puff Z-pinch system, material demarcation plate；
It is screening installation detection zone between the slide plate and material demarcation plate；The laser identification system and visible light identification are
System is connect with gas puff Z-pinch system respectively；
The laser light source includes laser generator, optical fiber, lens；The laser light source issues laser by laser generator and passes through
Fiber coupling, by laser beam expanding, forms a strip light belt in screening installation detection zone to lens.
2. laser material separation device according to claim 1, it is characterised in that: the laser identification system, visible light
Identifying system can be separately positioned on screening installation detection zone two sides.
3. laser material separation device according to claim 1, it is characterised in that: the strip light belt can be one
Or more laser cameras provide illumination.
4. laser material separation device according to claim 1, it is characterised in that: the laser generator issues in laser
A length of 1400nm ~ the 1600nm of cardiac wave.
5. laser material separation device according to claim 1, it is characterised in that: the laser camera is to infrared band
Sensitive indium gallium arsenic (InGaAs) line array sensor.
6. laser material separation device according to claim 1, it is characterised in that: the gas puff Z-pinch system and jet fill
Connection is set, the air-jet device includes electromagnetism spray valve, nozzle.
7. laser material separation device according to claim 1, it is characterised in that: the laser identification system, visible light
Identifying system and execution system can laterally place multiple groups side by side.
8. a kind of laser material method for separating, it is characterised in that: in above-mentioned laser material separation device,
1) sorting execution system is made of screening installation detection zone slide plate and material demarcation plate, and oscillating feeder is by sorted materials
It is uniformly spread out on slide plate, forms single layer material and pass through screening installation detection zone；
2) laser identification system is irradiated detection zone material by laser light source, LED illumination lamp, and laser light source is by laser
It expands and forms a strip light belt in screening installation detection zone, laser camera reflects material, the laser of scattering carries out
Image Acquisition and calculation process, laser camera distinguish foreign matter according to difference in reflectivity of the material to laser, and by identification signal
It is transmitted to gas puff Z-pinch system；
3) visible light identifying system is carried out at Image Acquisition and operation by visible light of the Visible Light Camera to material reflection, scattering
Reason, background board provide imaging background for Visible Light Camera, it is seen that light camera is according to material to the difference in reflectivity area of visible light
Foreign matter is separated, and identification signal is transmitted to gas puff Z-pinch system；
4) above-mentioned laser identification system, visible light identifying system carry out dual identification sorting to material simultaneously, and by identification signal
It is transmitted to gas puff Z-pinch system, gas puff Z-pinch system receives the identification from laser identification system and visible light identifying system simultaneously
Signal carries out fusion and is uniformly processed, and exports stroke signal to air-jet device；
5) the electromagnetism spray valve of above-mentioned air-jet device receives stroke signal and ejects high pressure gas pulse, in screening installation detection zone
Domain, the pernicious impurity 2 that nozzle rejects little particle foreign matter and material is homochromy, same to density, shape size are all close.
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