CN102553830B - Laser scanning sorting machine - Google Patents
Laser scanning sorting machine Download PDFInfo
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- CN102553830B CN102553830B CN201110423347.3A CN201110423347A CN102553830B CN 102553830 B CN102553830 B CN 102553830B CN 201110423347 A CN201110423347 A CN 201110423347A CN 102553830 B CN102553830 B CN 102553830B
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- rotary drum
- background rotary
- arc
- baffle
- scanning
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Abstract
The invention discloses a laser scanning sorting machine, which comprises a feeding chute, a baffle, a background rotary drum, an optical scanning box, a discharging chute and a spray valve. The lateral surface of the background rotary drum is an inwards-concave arc surface, and the incident light scanned on the arc surface by the background rotary drum is perpendicularly to the tangential position of the radian of the arc surface. The baffle is an arc-surface baffle, a discharging port is in an arc shape, and the radians of the baffle, the discharging port and the background rotary drum are the same. The laser scanning sorting machine is simple in structure, low in requirement for accuracy of the arc discharging port, the arc baffle and the arc background rotary drum, low in processing difficulty, consistent in scanning signal strength, good in scanning effect, high in laser utilization rate, capable of achieving quick intellectualization, high in accuracy, simple in operation and easy to maintain. In addition, the price of the laser scanning sorting machine is only several hundred yuan higher than that of an original linear type processing.
Description
Technical field
The present invention relates to a kind of sorter, relate in particular to a kind of laser scanning sorting machine.
Background technology
High speed development along with all kinds of sorting technology, sorting object becomes and becomes increasingly abundant, relate to the numerous areas such as grain, vegetables, fruit, tobacco, electronic device, ore, wherein people pay attention to further for the quality of food, therefore already more and more higher for the requirement of food sorting.Now, traditional sorting technology based on Digital Image Processing can not meet present required precision.Under this background, people introduce laser technology, use semiconductor laser, and the design by light path and building coordinates rotating prism, forms the laser scanning system of large visual field.
Yet this large field of view scan technology, has several shortcomings:
One, during the plane of scanning motion, be difficult to obtain relatively consistent sweep signal, on scan line, M signal is strong, and a little less than the signal of both sides, wherein transverse axis is scanning position, the illumination of the longitudinal axis for surveying.This is mainly by angle of light degree, light path and tilting mirror clear aperture is inconsistent causes.
Two, during the plane of scanning motion, the size of scanning light spot can change and change along with scanning angle, is embodied in when hot spot focuses on scan line center, and center spot be circle, and two ends hot spot is ellipticity, and spot width narrows down to center gradually from scan line two ends.
Three,, during the plane of scanning motion, although angular scanning speed is at the uniform velocity, the displacement of unit interval interscan point changes, little at scan line the center displacement, large at scan line two end movements.
For above three shortcomings, someone has proposed the design of optical lens group and sideboard:
By optical lens group, be also ftheta mirror group, can obtain consistent scanning angle, part solves first shortcoming, has better solved second and the 3rd shortcoming, but complex structure, along with the increase of scanning angle, lens sizes increases.High accuracy plano-concave, planoconvex spotlight, if every processing dimension reaches wide 50cm, price is wanted nearly ten thousand yuan, and this large field of view scan system at least needs 3 large scale lens to form ftheta set of lenses.
In the design of sideboard, transmission region is adjustable.If reduce territory, central transparent area, increase two ends transmission region, can solve well first shortcoming.This structure is relatively simple, convenient operation and realization.But this design cannot be eliminated the impact of second and the 3rd shortcoming, and reduced the effective rate of utilization of laser.
Summary of the invention
The technical problem to be solved in the present invention is that existing laser scanning sorting machine is effective, complex structure and involving great expense, and effect simple in structure is poor, and the effective rate of utilization of laser is low.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of laser scanning sorting machine, includes hopper, baffle plate, background rotary drum, optical scanner case, blow tank and spray valve; Material flow average rate to be sorted transmits from back to front along feed chute, and dishes out from the discharging opening of feed chute; Baffle plate is positioned at feed chute front end, and its top flushes with feed chute bottom surface; Background rotary drum is positioned at the below of baffle plate front end; Blow tank is positioned at the bottom of background rotary drum, comprises the rejection groove and the receiving slit that are arranged side by side; The output of optical scanner case is connected with the input of the control system of peripheral hardware, and it strafes the rear that position is positioned at material flow, and this position is corresponding with the background rotary drum position that is positioned at material flow the place ahead; Described spray valve is positioned between background rotary drum and blow tank, and the output of the control system of its control end connection peripheral hardware, the cambered surface that the side surface of background rotary drum is indent, and the incident light that optical scanner case is strafed in cambered surface is vertical with the tangential position of the radian of cambered surface; Said baffle is cambered surface baffle plate, and discharging opening is also arc; Baffle plate, discharging opening and background rotary drum three's radian is identical.
Aforementioned optical scanner case adopts existing product, and the discharging opening of arc can make material flow be cambered surface when falling, and the baffle plate of arc, when making material flow keep cambered surface, can play the effect of the horizontal velocity when slowing down material flow and dishing out; Material flow is from falling between baffle plate and discharging opening between optical scanner case and background rotary drum, optical scanner case forms scanning to the material flow of cambered surface, the sweep signal reflecting is got back to the sampling of optical scanner case through former scanning optical path, central control system is by sampled signal comparative analysis, control the switching of spray valve simultaneously, material flow is entered respectively and reject groove or receiving slit.Because the radian of curved baffle, arc discharging opening and arc background rotary drum is consistent, and the incident light that optical scanner case is strafed in cambered surface is vertical with the tangential position of the radian of cambered surface, guaranteed to strafe light incident angle, to strafe light all basically identical to the light path of plane each point, and on the same plane of scanning motion, to the analysis of the point of each almost under unified condition, the comparative analysis forming is like this more consistent, more accurate.
Advantage of the present invention is: simple in structure, camber discharging opening, curved baffle, and the required precision of arc rotary drum is not high, difficulty of processing is low, and price is only than the expensive hundreds of units of former linear pattern processing, and the signal strength signal intensity of scanning is consistent, scan effectively, laser utilization rate is high, can realize fast intelligent, high accuracy, simple to operate, easy care.
Accompanying drawing explanation
Fig. 1 is existing laser scanning sorting machine scanning theory schematic diagram.
Fig. 2 is the scanning effect schematic diagram of the laser scanning sorting machine shown in Fig. 1.
Fig. 3 is structural representation of the present invention.
Fig. 4 is scanning theory schematic diagram of the present invention.
Fig. 5 is scanning effect schematic diagram of the present invention.
The specific embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
As shown in Figure 1, the background rotary drum 4 that existing laser scanning sorting machine adopts is column type, and optical scanner case 2 comprises beam splitter 2-1, the rotating prism 2-2 by high-speed electric expreess locomotive driven rotary, at least one photo-detector 2-3, the laser instrument 2-4 of at least one, the condenser lens 2-5 of at least one, the prism 2-6 of at least one.
During use, the laser that laser instrument 2-4 sends, through beam splitter 2-1, being transmitted through condenser lens 2-5 focuses on, rotating prism 2-2, through rotating prism 2-2 reflection, material is scanned again, the optical signal of scanning element reflection reflexes to condenser lens 2-5 and beam splitter 2-1 along original optical path by rotating prism 2-2, through beam splitter 2-1, reflexes to prism 2-6, and by photo-detector, 2-3 receives.Utilize the characteristic of beam splitter 2-1, make scanning and reflected signal sampling share same light path.
As shown in Figure 2, transverse axis is scanning position, the signal strength signal intensity of the longitudinal axis for surveying, the scanning effect of existing laser scanning sorting machine is because angle of light degree, light path and tilting mirror clear aperture are inconsistent, cause sweep signal to be difficult to be consistent, present on scan line M signal strong, the phenomenon that both sides signal is weak.Experimental data: flat scanning light path, plane and rotating mirror scanning device vertical range are 45cm, every scanning 10 degree, the current point of sampling, scans 60 degree from left to right, records 7 some data, for: 0.25,0.27,0.31,0.32,0.31,0.28,0.26, the lux of unit.
As shown in Figure 3, the present invention includes feed chute 1, baffle plate 3, background rotary drum 4, optical scanner case 2, blow tank and spray valve 6; Material flow 5 average rates to be sorted transmit from back to front along feed chute 1, and dish out from the discharging opening 1-1 of feed chute 1; Baffle plate 3 is positioned at feed chute 1 front end, and its top flushes with feed chute 1 bottom surface; Background rotary drum 4 is column type, and is positioned at the below of baffle plate 3 front ends; Blow tank is positioned at the bottom of background rotary drum 4, comprises the rejection groove 7 and the receiving slit 8 that are arranged side by side; The output of optical scanner case 2 is connected with the input of the control system of peripheral hardware, and it strafes the rear that position is positioned at material flow 5, and this position is corresponding with background rotary drum 4 positions that are positioned at material flow 5 the place aheads; Described spray valve 6 is installed on blow tank top, and its control end connects the output of the control system of peripheral hardware.Background rotary drum 4 any one cross section is vertically circle, the cambered surface that its side surface is indent, and the incident light that optical scanner case 2 is strafed in cambered surface is vertical with the tangential position of the radian of cambered surface; Said baffle 3 is cambered surface baffle plate, and discharging opening 1-1 is also arc; Baffle plate 3, discharging opening 1-1 and background rotary drum 4 threes' radian is identical.
During work, need the material flow 5 of sorting first by the conveyer belt in feed chute 1, from rear end forward end, evenly to be sent, when baffle plate 3, horizontal velocity slows down, be cambered surface, in 2 pairs of material flow 5 of optical scanner case with background rotary drum 4 corresponding positions, position cambered surface scan, the sweep signal reflecting is got back to sampling in optical scanner case 2 through former scanning optical path, the signal of sampling is conveyed into the control system of peripheral hardware, and in control system by sampled signal comparative analysis, control system is controlled the switching of the spray valve 6 between background rotary drum 4 and blow tank simultaneously, when sweep signal normal, while being product standard up to specification, spray valve 6 is in closed condition, product introduction dump tank 8, when sweep signal abnormal, be that product is while being substandard products and foreign matter, spray valve 6 is opened, by jet power, bad part eject is entered to reject groove 7, thereby complete the sort process of material.Described spray valve 6 is existing product, generally compressor, air-blast atomizer array, consists of.
As shown in Figure 4, the background rotary drum 4 that the present invention adopts is cambered surface background rotary drum, and its any one cross section is vertically circle, the cambered surface that its side surface is indent, and optical scanner case 2 adopts existing product.Laser instrument 2-4 and photo-detector 2-3 can select as required two covers or more than two covers, by different wave length, be used in combination, and reach best sorting effect.
Described rotating prism 2-2, its rotary actuation depends on existing high-speed electric expreess locomotive, rotating speed reaches per minute 10,000 and turns above, and the speed controling signal of motor derives from the control system of peripheral hardware, and the photoelectric encoder of motor feeds back to control system by the face positional information of rotating prism 2-2 simultaneously.
Described photo-detector 2-3, is comprised of photomultiplier and supporting low-noise amplifier or the similar device of performance thereof, for optical signal is converted to the signal of telecommunication.Photomultiplier is a kind of faint optical signal sensitive detection parts of existing ISO, has the features such as signal amplifying power is strong, precision is high, volume is little.The intensity of reflected light that the signal of each sampling is a bit.
During use, described laser instrument 2-4 only scans a bit constantly at each, and rotating prism 2-2 often turns over one side, forms a scan line.And select photomultiplier as photo-detector 2-3, optical signal is converted to the signal of telecommunication; The signal of each sampling is a certain point reflection luminous intensity on scan line, and photo-detector 2-3 need not stop sweep signal to sample.
As shown in Figure 5, transverse axis is scanning position, the signal strength signal intensity of the longitudinal axis for surveying, and the present invention, because angle of light degree, light path are all consistent, causes sweep signal to be also consistent, and on scan line, the power of M signal and both sides signal is also consistent.Experimental data: cambered surface scanning optical path, cambered surface and rotating mirror scanning device vertical range are 45cm, every scanning 10 degree, the current point of sampling, scans 60 degree from left to right, records 7 some data, for: 0.31,0.32,0.32,0.32,0.33,0.33,0.32, the lux of unit.
Claims (1)
1. a laser scanning sorting machine, includes hopper, baffle plate, background rotary drum, optical scanner case, blow tank and spray valve;
Material flow average rate to be sorted transmits from back to front along feed chute, and dishes out from the discharging opening of feed chute;
Baffle plate is positioned at feed chute front end, and its top flushes with feed chute bottom surface;
Background rotary drum is positioned at the below of baffle plate front end;
Blow tank is positioned at the bottom of background rotary drum, comprises the rejection groove and the receiving slit that are arranged side by side;
The output of optical scanner case is connected with the input of the control system of peripheral hardware, and it strafes the rear that position is positioned at material flow, and this position is corresponding with the background rotary drum position that is positioned at material flow the place ahead;
Described spray valve is positioned between background rotary drum and blow tank, and its control end connects the output of the control system of peripheral hardware, it is characterized in that: background rotary drum any one cross section is vertically circle, its side surface is the cambered surface of indent, and the incident light that optical scanner case is strafed in cambered surface is vertical with the tangential position of the radian of cambered surface; Said baffle is cambered surface baffle plate, and discharging opening is also arc; Baffle plate, discharging opening and background rotary drum three's radian is identical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110423347.3A CN102553830B (en) | 2011-12-16 | 2011-12-16 | Laser scanning sorting machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110423347.3A CN102553830B (en) | 2011-12-16 | 2011-12-16 | Laser scanning sorting machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102553830A CN102553830A (en) | 2012-07-11 |
| CN102553830B true CN102553830B (en) | 2014-12-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110423347.3A Expired - Fee Related CN102553830B (en) | 2011-12-16 | 2011-12-16 | Laser scanning sorting machine |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3973826A (en) * | 1972-01-25 | 1976-08-10 | Redifon Limited | Scanning devices |
| CA2279574A1 (en) * | 1997-01-31 | 1998-08-06 | The Horticulture & Food Research Institute Of New Zealand Ltd. | Optical apparatus |
| CN1198966A (en) * | 1997-05-09 | 1998-11-18 | 瓦克化学有限公司 | Optoelectronic classification apparatus |
| US6864970B1 (en) * | 2000-10-11 | 2005-03-08 | Best N.V. | Apparatus and method for scanning products with a light beam to detect and remove impurities or irregularities in a conveyed stream of the products |
| CN1655882A (en) * | 2002-05-28 | 2005-08-17 | 佐竹美国公司 | Illumination source for sorting machine |
| CN202427649U (en) * | 2011-12-16 | 2012-09-12 | 东南大学 | Laser scanning sorting machine |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3343418B2 (en) * | 1993-09-20 | 2002-11-11 | 株式会社リコー | Optical scanning device |
| EP1025916A1 (en) * | 1999-02-08 | 2000-08-09 | Barco Elbicon N.V. | Self-cleaning infeed system for a machine for visual inspection |
-
2011
- 2011-12-16 CN CN201110423347.3A patent/CN102553830B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3973826A (en) * | 1972-01-25 | 1976-08-10 | Redifon Limited | Scanning devices |
| CA2279574A1 (en) * | 1997-01-31 | 1998-08-06 | The Horticulture & Food Research Institute Of New Zealand Ltd. | Optical apparatus |
| CN1198966A (en) * | 1997-05-09 | 1998-11-18 | 瓦克化学有限公司 | Optoelectronic classification apparatus |
| US6864970B1 (en) * | 2000-10-11 | 2005-03-08 | Best N.V. | Apparatus and method for scanning products with a light beam to detect and remove impurities or irregularities in a conveyed stream of the products |
| CN1655882A (en) * | 2002-05-28 | 2005-08-17 | 佐竹美国公司 | Illumination source for sorting machine |
| CN202427649U (en) * | 2011-12-16 | 2012-09-12 | 东南大学 | Laser scanning sorting machine |
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| CN102553830A (en) | 2012-07-11 |
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| C53 | Correction of patent for invention or patent application | ||
| CB02 | Change of applicant information |
Address after: Center branch No. 3 ancient Tan Avenue in Gaochun County of Nanjing City, Jiangsu province 211300 Room 405 Applicant after: Southeast University Address before: 210096 Jiangsu city Nanjing Province four pailou No. 2 Applicant before: Southeast University |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141203 Termination date: 20171216 |