CN111257271A - Potato autofilter device based on spectrum technique - Google Patents
Potato autofilter device based on spectrum technique Download PDFInfo
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- 244000061456 Solanum tuberosum Species 0.000 title claims abstract description 54
- 235000002595 Solanum tuberosum Nutrition 0.000 title claims abstract description 54
- 238000001228 spectrum Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims description 9
- 235000013606 potato chips Nutrition 0.000 claims abstract description 100
- 238000001514 detection method Methods 0.000 claims abstract description 68
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 229920002472 Starch Polymers 0.000 claims abstract description 26
- 235000019698 starch Nutrition 0.000 claims abstract description 26
- 239000008107 starch Substances 0.000 claims abstract description 26
- 235000012015 potatoes Nutrition 0.000 claims abstract description 21
- 238000012216 screening Methods 0.000 claims abstract description 18
- 238000012545 processing Methods 0.000 claims abstract description 11
- 238000005516 engineering process Methods 0.000 claims abstract description 7
- 238000002329 infrared spectrum Methods 0.000 claims abstract description 6
- 238000012546 transfer Methods 0.000 claims description 33
- 238000002386 leaching Methods 0.000 claims description 11
- 238000003331 infrared imaging Methods 0.000 claims description 6
- 230000007246 mechanism Effects 0.000 claims description 5
- 240000007643 Phytolacca americana Species 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 239000013307 optical fiber Substances 0.000 claims description 3
- 230000032258 transport Effects 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 2
- 230000008569 process Effects 0.000 claims description 2
- 238000011084 recovery Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 5
- 230000003595 spectral effect Effects 0.000 abstract 1
- 230000005540 biological transmission Effects 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 235000013305 food Nutrition 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
- 235000021049 nutrient content Nutrition 0.000 description 1
- 238000012847 principal component analysis method Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3563—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing solids; Preparation of samples therefor
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- A—HUMAN NECESSITIES
- A21—BAKING; EDIBLE DOUGHS
- A21B—BAKERS' OVENS; MACHINES OR EQUIPMENT FOR BAKING
- A21B5/00—Baking apparatus for special goods; Other baking apparatus
- A21B5/08—Apparatus for baking in baking fat or oil, e.g. for making doughnuts
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L19/00—Products from fruits or vegetables; Preparation or treatment thereof
- A23L19/10—Products from fruits or vegetables; Preparation or treatment thereof of tuberous or like starch containing root crops
- A23L19/12—Products from fruits or vegetables; Preparation or treatment thereof of tuberous or like starch containing root crops of potatoes
- A23L19/18—Roasted or fried products, e.g. snacks or chips
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/08—Measuring arrangements characterised by the use of optical techniques for measuring diameters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3554—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for determining moisture content
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N2021/3595—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using FTIR
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Abstract
The invention relates to an automatic potato screening device based on a spectrum technology. The potato chips are detected in real time one by utilizing the infrared spectrum, the water content, the starch uniformity and the diameter of the potatoes can be determined according to the light intensity-time curve, so that the measurement of various parameters can be realized by using single equipment, the measurement is real-time, the measurement can be applied to on-line detection, and the structure of a special transportation device is also arranged, so that the spectral stability is ensured; in addition, the processing device for the fried potatoes is arranged in combination with the detection device, so that the frying time of the potatoes is related to the water content of the potatoes, the water content of the potatoes influences the oil content of the potatoes during frying, the consistency of the mouthfeel of the fried potatoes after frying is ensured, and the detection device for the oil content is arranged, so that the oil content of the surfaces of the potato chips reaching the end point finally is consistent.
Description
Technical Field
The invention relates to the field of optical detection, in particular to an automatic potato screening device based on a spectrum technology.
Background
Potatoes are food which is eaten daily, detection of the potatoes in the prior art is generally a sampling mode detection, detection results are difficult to represent reality of a large number of potatoes, in addition, the ingredient content of each potato is different when fine processing is carried out, and a large amount of time is inevitably wasted if each potato is subjected to separate detection.
For example, the potato transmission machine vision image real-time online detection test bed with application number of CN201320694192.1 is composed of a detection bench, a passive carrier roller, a belt with holes, a carrier belt plate of the belt, a machine vision transmission image acquisition box, a transmission light source box, a driving carrier roller, a driven synchronous pulley, a synchronous belt, a driving synchronous pulley, a stepping motor, a frequency converter, a control switch, a tension device of the belt, a horizontal adjusting device of the detection bench and the like, the external quality and the internal quality characteristic indexes of the potatoes are simultaneously detected and analyzed on line by the transmission machine vision technology, the belt with holes is adopted to convey potato detection samples, the comprehensive detection result of the internal and external characteristic indexes of the potatoes can be obtained at one time, the quality grading is completed, the detection and the sorting efficiency of the potato quality are improved, but firstly, the calculation force required by image detection is very large, and secondly, the detection precision of, the effect of reaching and manual visual inspection is the most.
The infrared spectrum technology is a nondestructive testing mode which is recently developed, can rapidly test the water content, the nutrient content and the like of various foods, and has high testing precision. However, the current detection mode generally stays in a laboratory stage, and the actual production line is rarely used.
Disclosure of Invention
Aiming at the above, in order to solve the above problems, an automatic potato screening device based on a spectrum technology is provided, which comprises a computer, a control host, an online detection box and a transportation device;
the control host is connected with a computer, the computer sends a detection command to the control host, and the computer receives detected spectrum data from the control host; the control host is connected with the online detection box, a light emitting head and a light receiving head are arranged in the online detection box, so that the potato chips are subjected to spectrum detection, and the light receiving head transports the received light to the control host; the control host is internally provided with a light source and a light splitting device, light emitted by the light source is transmitted to the light emitting head through the optical fiber, and the light splitting device receives light transmitted back by the light receiving head and converts the light into Fourier infrared spectrum data;
a plurality of potato chips can be flatly placed on the conveying device, and the conveying device conveys the flatly placed potato chips one by one to the lower part of the online detection box for detection, and the lower part of the online detection box is conveyed out.
The on-line detection box is arranged right above the conveying device, and light emitted by the light emitting head is reflected by the potato chips on the surface of the conveying device and then received by the light receiving head; a light condensing device is arranged in front of the light receiving head, so that more than 80% of light scattered by the potato chips can be received by the light receiving head;
the conveyer belt that the conveyer belt is provided with reflection of light bellied for the surface, and reflection of light is protruding for the prismatic arch that parallels with the conveyer belt direction of motion for when the potato piece passes through light on-line measuring box below one by one, when the clearance between the potato piece is shone by the optical head, the light that sends through from the optical head is whole to be reflected outside the beam condensing unit by prismatic arch, makes the light receiving head can not receive the light signal.
The spectrum signal received by the computer is a continuous spectrum signal, namely the spectrum data received by the computer is a curve of the light intensity of a plurality of characteristic wavelengths received by the light receiving head along with the change of time, namely a light intensity-time curve;
the light intensity-time curve represents the reflected light intensity of characteristic wavelengths of different positions of the potato chips along the advancing direction of the conveyor belt, and the characteristic wavelengths are Fourier infrared characteristic wavelengths representing the water content or starch content of the potatoes.
The computer processes the data of the light intensity-time curve, firstly, the light intensity-time curve is divided, namely, the light intensity-free position is identified as a non-potato, the light intensity-free position is identified as a potato chip, and then the time length t of the light intensity-time curve, the average intensity R of the characteristic wavelength of the water content and the standard deviation E of the characteristic wavelength of starch corresponding to each potato chip are obtained;
determining the average water content W, the starch uniformity M and the diameter D of the potato chips according to the light intensity time curve; wherein the average water content W ═ pR; m ═ qE; d ═ vt; where p, q are constants of the coefficients and v is the speed of the conveyor.
A potato chip processing system, its characterized in that utilizes above-mentioned autofilter device, the processing system still includes:
the device comprises a transfer part, a feeding part, a frying part, an oil content detection part and an oil draining part; the transfer part comprises two sections, the first transfer part is arranged between the feeding part and the frying part and can transfer potato chips in the feeding part to the frying part, and the second transfer part is arranged between the frying part and the oil draining part and transfers the potato chips fried in the frying part to the oil draining part;
the feeding part comprises an automatic arranging machine and a feeding pushing-out mechanism, the automatic arranging machine arranges the cut potato chips into a row one by one, and then the feeding pushing-out mechanism pushes the row of potato chips onto the first transfer part, so that the row of potato chips can be transferred to the frying part by the first transfer part;
an automatic screening device is arranged between the feeding part and the frying part, and is used for detecting the average moisture content W, the starch uniformity M and the diameter D of the potato chips, judging whether the starch uniformity M and the diameter D meet the detection standards and judging the average moisture content W; the automatic screening device divides the average water content into three grades of high, medium and low;
the deep-frying part is provided with three deep-frying pan bodies which are arranged continuously and communicated with one another, the deep-frying part is provided with deep-frying ejectors corresponding to the three deep-frying pan bodies, the deep-frying ejectors respectively retreat potato chips with three levels of average moisture contents with qualified starch uniformity M and diameter D into the three deep-frying pan bodies, and the moisture contents and the deep-frying pan bodies can be arranged according to requirements; potato chips with unqualified starch uniformity M and diameter D are not processed and fall into a recycling bin at the end point of a first transfer part;
the three frying pan bodies which are continuously arranged are provided with poking rods, so that the potato chips of the first frying pan body can be poked to the second frying pan body, the potato chips of the second frying pan body can be poked to the third frying pan body, and the outlet of the third frying pan body is connected to the second transfer part;
an oil content detection part is arranged between the frying part and the oil draining part, an infrared imaging camera and an air cooler are arranged on the oil content detection part, an air outlet of the air cooler is aligned with the fried potato chips so as to cool the potato chips, and the infrared camera performs infrared imaging on the fried potato chips so as to judge the temperature of the potato chips; because the cooling rate of the potato chips with high oil content is lower than that of the potato chips with low oil content, the temperature of the potato chips can be divided into different grades;
the oil leaching part is arranged behind the oil content detection part and is provided with an oil leaching slideway, and the potato chips slide in the oil leaching slideway and simultaneously leach oil out; different positions of the oil dropping slide way are provided with corresponding oil dropping ejectors, and the oil dropping ejectors push the potato chips from the second transfer part to different positions of the oil dropping slide way according to the temperature of the potato chips, so that the potato chips can have different oil dropping times, and the content of the potato chips entering the finished product box at last is guaranteed to be consistent.
The invention has the technical effects that:
the invention utilizes infrared spectrum to detect potato chips one by one in real time, and can determine the moisture content, starch uniformity and diameter of the potato chips according to a light intensity-time curve, thereby realizing the measurement of various parameters by using single equipment, and the measurement is real-time and can be applied to on-line detection; in addition, the processing device for the fried potatoes is arranged in combination with the detection device, so that the frying time of the potatoes is related to the water content of the potatoes, the water content of the potatoes influences the oil content of the potatoes during frying, the consistency of the mouthfeel of the fried potatoes after frying is ensured, and the detection device for the oil content is arranged, so that the oil content of the surfaces of the potato chips reaching the end point finally is consistent.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosed subject matter, are incorporated in and constitute a part of this specification. The drawings illustrate the implementations of the disclosed subject matter and, together with the detailed description, serve to explain the principles of implementations of the disclosed subject matter. No attempt is made to show structural details of the disclosed subject matter in more detail than is necessary for a fundamental understanding of the disclosed subject matter and various modes of practicing the same.
FIG. 1 is a schematic view of the overall structure of the detecting device of the present invention;
fig. 2 is a schematic structural view of a processing system of the present invention.
Detailed Description
The advantages, features and methods of accomplishing the same will become apparent from the drawings and the detailed description that follows.
Example 1:
the automatic potato screening device based on the spectrum technology comprises a computer 1, a control host 2, an online detection box 3 and a conveying device 4;
the control host 2 is connected with the computer 1, the computer 1 sends a detection command to the control host 2, and the computer 1 receives detected spectrum data from the control host 2; the control host machine 2 is connected with the on-line detection box 3, a light emitting head 31 and a light receiving head 32 are arranged in the on-line detection box 3, so that the potato chips 5 are subjected to spectrum detection, and the light receiving head 32 transports received light to the control host machine 2; a light source and a light splitting device are arranged in the control host 2, light emitted by the light source is transmitted to the light emitting head 31 through an optical fiber, and the light splitting device receives light transmitted back by the light receiving head 32 and converts the light into Fourier infrared spectrum data;
a plurality of potato chips can be flatly placed on the conveying device 4, and the conveying device 4 conveys the flatly placed potato chips one by one to the lower part of the on-line detection box 3 for detection, and the potato chips are conveyed out of the lower part of the on-line detection box 3.
The on-line detection box 3 is arranged right above the transportation device 4, and light emitted by the light emitting head 31 is reflected by the potato chips on the surface of the transportation device 4 and then received by the light receiving head 32; a light-gathering device 33 is arranged in front of the light-receiving head 32, so that more than 80% of light scattered by the potato chips can be received by the light-receiving head 32;
the conveying device 4 is a conveying belt with a reflective bulge arranged on the surface, the reflective bulge is a prismatic bulge 41 parallel to the moving direction of the conveying belt, so that when potato chips pass through the lower part of the light online detection box 3 one by one, and gaps among the potato chips are irradiated by the light emitting head 31, light emitted from the light emitting head 31 is totally reflected to the outside of the light gathering device by the prismatic bulge 41, and light signals cannot be received by the light receiving head 32.
The spectrum signal received by the computer 1 is a continuous spectrum signal, that is, the spectrum data received by the computer 1 is a curve of light intensity of several characteristic wavelengths received by the light receiving head 32 along with time, that is, a light intensity-time curve;
the light intensity-time curve represents the reflected light intensity of characteristic wavelengths of different positions of the potato chips along the advancing direction of the conveyor belt, and the characteristic wavelengths are Fourier infrared characteristic wavelengths representing the water content or starch content of the potatoes.
The computer 1 carries out data processing on the light intensity-time curve, firstly, the light intensity-time curve is divided, namely, the light intensity-free position is identified as a non-potato, the light intensity-free position is identified as a potato chip, and then the time length t of the light intensity-time curve, the average intensity R of the characteristic wavelength of the water content and the standard deviation E of the characteristic wavelength of starch corresponding to each potato chip are obtained;
determining the average water content W, the starch uniformity M and the diameter D of the potato chips according to the light intensity time curve; wherein the average water content W ═ pR; m ═ qE; d ═ vt; where p, q are constants of the coefficients and v is the speed of the conveyor.
Example 2:
a potato chip processing system, characterized in that the above-mentioned autofilter device 100 is utilized, the processing system further comprises:
a transfer part, a feeding part 300, a frying part 400, an oil content detection part 500 and an oil draining part 600; the transfer part comprises two sections, the first transfer part 201 is arranged between the feeding part 300 and the frying part 400 and can transfer the potato chips in the feeding part 300 to the frying part 400, and the second transfer part 202 is arranged between the frying part 400 and the oil draining part 600 and can transfer the potato chips fried in the frying part 400 to the oil draining part 600;
the feeding section 300 includes an automatic arranging machine 301 that arranges the cut potato chips one by one into a row, and a feeding pushing mechanism 302 that pushes the row of potato chips onto the first transfer section 201 so that the row of potato chips can be transferred by the first transfer section 201 to the frying section 400;
an automatic screening device is arranged between the feeding part 300 and the frying part 400, the average water content W, the starch uniformity M and the diameter D of the potato chips are detected, whether the starch uniformity M and the diameter D meet the detection standards or not is judged, and the average water content W is judged; the automatic screening device divides the average water content into three grades of high, medium and low;
the frying part 400 is provided with three frying pan bodies which are arranged continuously and communicated with one another, the frying part 400 is provided with frying push-out devices 404 which correspond to the three frying pan bodies, the frying push-out devices 404 respectively return the potato chips with qualified starch uniformity M and diameter D with three grades of average moisture content into the three frying pan bodies, and the moisture content and the correspondence of the frying pan bodies can be set as required; potato chips with unqualified starch uniformity M and diameter D are not processed and fall into a recovery box at the end point of the first transfer part 201;
the three frying pan bodies which are arranged in series are provided with poke rods which can poke the potato chips of the first frying pan body 401 to the second frying pan body 402 and the potato chips of the second frying pan body 402 to the third frying pan body 403, and the outlet of the third frying pan body 403 is connected to the second transfer part 202;
an oil content detection part 500 is arranged between the frying part 400 and the oil dropping part 600, the oil content detection part 500 is provided with an infrared imaging camera and an air cooler, an air outlet of the air cooler is aligned with the fried potato chips so as to cool the potato chips, and the infrared camera carries out infrared imaging on the fried potato chips so as to judge the temperature of the potato chips; because the cooling rate of the potato chips with high oil content is lower than that of the potato chips with low oil content, the temperature of the potato chips can be divided into different grades;
the oil leaching part 600 is arranged behind the oil content detection part 500, the oil leaching part 600 is provided with an oil leaching slideway 601, and the potato chips slide in the oil leaching slideway 601 and leach oil out; the different positions of the oil dripping slideway 601 are provided with corresponding oil dripping ejectors 602, and the oil dripping ejectors 602 eject the potato chips from the second transfer part 202 to different positions of the oil dripping slideway 601 according to the temperature of the potato chips, so that the potato chips can have different oil dripping times, and the content of the potato chips finally entering the finished product box is ensured to be consistent.
It is worth pointing out that the oil content of potato chips during frying is different from the oil content of potato chips after frying, and because the water content of the potato chips is different, the oil replaces water during frying, so that the interior of the potato chips contains oil; the oil drained after frying is the oil drained from most of the surfaces of the potato chips, and the oil replacing water is not drained much, so that the water content detection and the infrared detection of the oil content on the surfaces after frying are both steps needing to be controlled.
In addition, before infrared detection is performed, model establishment and characteristic wavelength screening are required, the characteristic wavelength screening has a mature screening mode in the prior art, generally, potato chips with different water contents and starch contents are subjected to infrared detection, then the characteristic wavelengths of the water contents and the starch contents are screened out by using a principal component analysis method and other modes, and then a corresponding chemometric model is established according to the intensity of the characteristic wavelengths, which is not described herein again.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (5)
1. An automatic potato screening device based on a spectrum technology comprises a computer (1), a control host (2), an online detection box (3) and a conveying device (4); the method is characterized in that:
the control host (2) is connected with the computer (1), the computer (1) sends a detection command to the control host (2), and the computer (1) receives detected spectrum data from the control host (2); the control host (2) is connected with the on-line detection box (3), a light emitting head (31) and a light receiving head (32) are arranged in the on-line detection box (3), so that the potato chips (5) are subjected to spectrum detection, and the light receiving head (32) transports received light to the control host (2); a light source and a light splitting device are arranged in the control host (2), light emitted by the light source is transmitted to the light emitting head (31) through an optical fiber, and the light splitting device receives light transmitted back by the light receiving head (32) and converts the light into Fourier infrared spectrum data;
a plurality of potato chips can be flatly placed on the conveying device (4), and the conveying device (4) conveys the flatly placed potato chips one by one to the lower part of the on-line detection box (3) for detection, and the potato chips are conveyed out of the lower part of the on-line detection box (3).
2. An apparatus for potato automatic screening based on spectrum technique according to claim 1, characterized in that: the online detection box (3) is arranged right above the transportation device (4), and light emitted by the light emitting head (31) is reflected by the potato chips on the surface of the transportation device (4) and then received by the light receiving head (32); a light condensing device (33) is arranged in front of the light receiving head (32), so that more than 80% of light scattered by the potato chips can be received by the light receiving head (32);
the conveying device (4) is provided with a conveying belt with a reflective bulge on the surface, and the reflective bulge is a prismatic bulge (41) parallel to the moving direction of the conveying belt, so that when potato chips pass through the lower part of the light online detection box (3) one by one, gaps among the potato chips are irradiated by the light emitting heads (31), and light emitted from the light emitting heads (31) is totally reflected to the outside of the light condensing device by the prismatic bulge (41), so that light signals can not be received by the light receiving heads (32).
3. An apparatus for potato automatic screening based on spectrum technique according to claim 2, characterized in that: the spectrum signal received by the computer (1) is a continuous spectrum signal, namely the spectrum data received by the computer (1) is a curve of light intensity of a plurality of characteristic wavelengths received by the light receiving head (32) along with time change, namely a light intensity-time curve;
the light intensity-time curve represents the reflected light intensity of characteristic wavelengths of different positions of the potato chips along the advancing direction of the conveyor belt, and the characteristic wavelengths are Fourier infrared characteristic wavelengths representing the water content or starch content of the potatoes.
4. An apparatus for potato automatic screening based on spectrum technique according to claim 3, characterized in that: the computer (1) processes the data of the light intensity-time curve, firstly, the light intensity-time curve is divided, namely, the light intensity-free position is identified as a non-potato, the light intensity-free position is identified as a potato chip, and then the time length t of the light intensity-time curve, the average intensity R of the characteristic wavelength of the water content and the standard deviation E of the characteristic wavelength of starch corresponding to each potato chip are obtained;
determining the average water content W, the starch uniformity M and the diameter D of the potato chips according to the light intensity time curve; wherein the average water content W ═ pR; m ═ qE; d ═ vt; where p, q are constants of the coefficients and v is the speed of the conveyor.
5. A potato chip processing system characterized by utilizing the automated screening apparatus (100) of any one of claims 1-4, said processing system further comprising:
a transfer part, a feeding part (300), a frying part (400), an oil content detection part (500) and an oil draining part (600); the transfer part comprises two sections, the first transfer part (201) is arranged between the feeding part (300) and the frying part (400) and can transfer potato chips of the feeding part (300) to the frying part (400), and the second transfer part (202) is arranged between the frying part (400) and the oil draining part (600) and can transfer potato chips fried in the frying part (400) to the oil draining part (600);
the feeding part (300) comprises an automatic arranging machine (301) and a feeding pushing-out mechanism (302), the automatic arranging machine arranges the cut potato chips into a row one by one, and then the feeding pushing-out mechanism pushes the row of potato chips onto the first transfer part (201), so that the row of potato chips can be transferred to the frying part (400) by the first transfer part (201); an automatic screening device is arranged between the feeding part (300) and the frying part (400) to detect the average moisture content W, the starch uniformity M and the diameter D of the potato chips, judge whether the starch uniformity M and the diameter D meet the detection standards and judge the average moisture content W; the automatic screening device divides the average water content into three grades of high, medium and low;
the deep-frying part (400) is provided with three deep-frying pan bodies which are continuously arranged and are communicated with each other, the deep-frying part (400) is provided with deep-frying ejectors (404) corresponding to the three deep-frying pan bodies, the deep-frying ejectors (404) respectively retreat the potato chips with the starch uniformity M and the starch diameter D qualified and with three grades of average moisture content into the three deep-frying pan bodies, and the moisture content and the correspondence of the deep-frying pan bodies can be set as required; potato chips with unqualified starch uniformity M and diameter D are not processed and fall into a recovery box at the end point of a first transfer part (201);
the three frying pan bodies which are arranged in series are provided with poke rods, so that the potato chips of the first frying pan body (401) can be poked to the second frying pan body (402), the potato chips of the second frying pan body (402) can be poked to the third frying pan body (403), and the outlet of the third frying pan body (403) is connected to the second transfer part (202);
an oil content detection part (500) is arranged between the frying part (400) and the oil dropping part (600), an infrared imaging camera and an air cooler are arranged in the oil content detection part (500), an air outlet of the air cooler is aligned to the fried potato chips so as to cool the potato chips, and the infrared camera performs infrared imaging on the fried potato chips so as to judge the temperature of the potato chips; because the cooling rate of the potato chips with high oil content is lower than that of the potato chips with low oil content, the temperature of the potato chips can be divided into different grades;
the oil leaching part (600) is arranged behind the oil content detection part (500), the oil leaching part (600) is provided with an oil leaching slideway (601), and the potato chips slide in the oil leaching slideway (601) and simultaneously leach oil out; the different positions of draining slide way (601) are provided with corresponding draining pusher (602), and draining pusher (602) pushes the potato chip out to the different positions of draining slide way (601) from second transfer portion (202) according to the temperature of potato chip to make the potato chip have different draining time, guarantee that the content of the potato chip that finally gets into the finished product case is unanimous.
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