CN112620159A - Material detection device and color sorter - Google Patents
Material detection device and color sorter Download PDFInfo
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- CN112620159A CN112620159A CN201910904235.6A CN201910904235A CN112620159A CN 112620159 A CN112620159 A CN 112620159A CN 201910904235 A CN201910904235 A CN 201910904235A CN 112620159 A CN112620159 A CN 112620159A
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- 238000001514 detection method Methods 0.000 title claims abstract description 46
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- 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
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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
- G01N21/59—Transmissivity
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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
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8806—Specially adapted optical and illumination features
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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
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
- G01N21/8914—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles characterised by the material examined
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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
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8806—Specially adapted optical and illumination features
- G01N2021/8838—Stroboscopic illumination; synchronised illumination
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Abstract
The invention provides a material detection device and a color selector, wherein the device comprises: the front-view light source and the rear-view light source are symmetrically distributed on two sides of the material and are sequentially and alternately turned on or off; the front-view camera and the rear-view camera are area-array cameras and are used for synchronously shooting materials; and the processing device is connected with the front-view camera and the rear-view camera and used for identifying the materials according to the images obtained by the front-view camera and the rear-view camera. The invention adopts a bilateral alternate illumination mode, can effectively eliminate the adverse effect of a light source on one side on the signal acquisition of a camera on the other side in the material detection, identification and sorting process, and simultaneously can solve the problem that the illumination on one side can not identify the two sides of the material, and can not influence the identification range of the material, thereby improving the material detection, identification and sorting effects.
Description
Technical Field
The invention relates to the technical field of color sorters, in particular to a material detection device and a color sorter.
Background
At present, a material sorting device adopting a front-rear view mirror arrangement mainly comprises two illumination modes, wherein one mode is that a single-side light source illuminates, and the other mode is that a double-side light source illuminates.
When the single-side light source is adopted for illumination, the material identification is incomplete, the identification range of the material is lost, and the identification effect is greatly reduced, so that the single-side light source illumination mode is generally not considered in practical application.
When the light source at two sides is adopted for illumination, the light source at one side of the material can influence the signal acquisition of the camera at the other side, particularly, a bright ring can appear at the edge of the spherical or quasi-spherical material, and a bright ring can also appear in the signal acquired by the camera, so that the sorting result of the material is influenced, and the sorting effect of the material is poor.
Disclosure of Invention
The present invention is directed to solving at least one of the above problems.
Therefore, one object of the present invention is to provide a material detecting device, which adopts a bilateral alternate illumination mode, and can effectively eliminate adverse effects of a light source on one side on signal acquisition of a camera on the other side in material detection, identification and sorting, and simultaneously solve the problem that the illumination on one side cannot identify two sides of a material, and cannot affect the identification range of the material, thereby improving the material detection, identification and sorting effects.
To this end, a second object of the invention is to propose a color sorter.
In order to achieve the above object, an embodiment of an aspect of the present invention provides a material detecting device, including: the front-view light source and the rear-view light source are symmetrically distributed on two sides of the material, and are sequentially and alternately turned on or turned off; the front-view camera is arranged on one side of the front-view light source, and the rear-view camera is arranged on one side of the rear-view light source, wherein the front-view camera and the rear-view camera are area-array cameras and are used for synchronously shooting the materials; the processing device is connected with the front-view camera and the rear-view camera and used for identifying the materials according to images obtained by the front-view camera and the rear-view camera.
According to the material detection device provided by the embodiment of the invention, the front-view light source and the rear-view light source are symmetrically distributed on two sides of the material, the front-view light source and the rear-view light source are sequentially and alternately turned on or off, and the front-view camera and the rear-view camera are used for synchronously shooting the material, so that bilateral alternate illumination is realized, the adverse effect of the light source on one side on the signal acquisition of the camera on the other side can be effectively eliminated in the material detection, identification and sorting process, meanwhile, the problem that two sides of the material cannot be identified by unilateral illumination can be solved, the identification range of the material cannot be influenced, and the material detection, identification and sorting effects can be.
In addition, the material detection device according to the present invention may further have the following additional technical features:
in some examples, the forward and rear view light sources are both stroboscopic light sources.
In some examples, the forward looking light source and the rearward looking light source are strobed at the same frequency.
In some examples, the forward or rearward looking light source strobes at a frequency that is half of the time that the forward or rearward looking camera takes.
In some examples, the forward or rearward looking light source has a strobe period that is twice the time that the forward or rearward looking camera takes.
In some examples, the falling speed of the material is determined by the width of a view frame of the front or rear camera on the material surface and the shooting time of the front or rear camera when the front and rear cameras shoot the material.
In some examples, the forward looking light source comprises: the material comprises a plurality of front view light units, wherein the plurality of front view light units are arranged on one side of the material and are simultaneously lightened or extinguished.
In some examples, the rear view light source includes: and the plurality of rear-view light units are in one-to-one correspondence with the plurality of front-view light units, are arranged on the other side of the material, and are simultaneously lightened or extinguished.
In some examples, the plurality of rear light units are extinguished when the plurality of front light units are lit and the plurality of rear light units are lit when the plurality of front light units are extinguished.
In order to achieve the above object, an embodiment of a second aspect of the present invention provides a color sorter, including the material detection apparatus according to the above embodiment of the present invention.
According to the color sorter provided by the embodiment of the invention, the front-view light source and the rear-view light source are symmetrically distributed on two sides of the material, the front-view light source and the rear-view light source are sequentially and alternately turned on or off, and the front-view camera and the rear-view camera are used for synchronously shooting the material, so that bilateral alternate illumination is realized.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of a material detection device according to an embodiment of the present invention;
FIG. 2 is a schematic view of an image of a material level in a front-view camera, according to one embodiment of the present invention;
FIG. 3 is a schematic illustration of imaging of a material face in a rear view camera in accordance with one embodiment of the present invention;
FIG. 4 is a schematic diagram of a color sorter according to one embodiment of the invention;
fig. 5 is a schematic structural diagram of a color selector according to an embodiment of the present invention.
Description of reference numerals: 1-a front-view camera; 2-a forward-looking light source; 3-background board; 4-front background plate; 5-a rear view light source; 6-a rear view camera; 7-material; 200-color sorter; 210-feeder 220-channel; 230-a spray valve; 240-stock chest.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The following describes a material detection device and a color sorter according to an embodiment of the invention with reference to fig. 1 to 5.
Fig. 1 is a schematic structural diagram of a material detection device according to an embodiment of the present invention. As shown in fig. 1, the material detecting apparatus includes: a forward view light source 2, a rear view light source 5, a forward view camera 1, a rear view camera 6 and processing means (not shown in the figure). It can be understood that when the material detection and identification are carried out, a background system is also combined, and comprises a rear background plate 3 and a front background plate 4, wherein the front-view camera 1 is arranged opposite to the front background plate 4, and the rear background plate 3 is arranged opposite to the rear-view camera 6.
Specifically, the front-view light sources 2 and the rear-view light sources 5 are symmetrically distributed on two sides of the material 7, and the front-view light sources 2 and the rear-view light sources 5 are sequentially and alternately turned on or off. That is, when the front view light source 2 is turned on, the rear view light source 5 is turned off; when the front-view light source 2 is turned off, the rear-view light source 5 is turned on.
As shown in fig. 1, the front camera 1 is disposed on the front light source 2 side, and the rear camera 6 is disposed on the rear light source 5 side. The front-view camera 1 and the rear-view camera 6 are area-array cameras and are used for synchronously shooting the material 7, namely, the front-view camera 1 and the rear-view camera 6 shoot the material 7 at the same time; the processing device is connected with the front-view camera 1 and the rear-view camera 6 and is used for identifying the materials according to the images obtained by the front-view camera 1 and the rear-view camera 6.
In a specific embodiment, the processing device may be, for example, a computer, a programmable logic controller, a PLC controller, or the like having data processing, which can identify the material based on the images obtained by the front view camera 1 and the rear view camera 6.
In one embodiment of the present invention, the front view light source 2 and the rear view light source 5 are both stroboscopic light sources, i.e., sequentially turned on and off at a certain frequency. Specifically, the stroboscopic light source can reduce the power consumption of the color sorter, so that energy is saved.
In one embodiment of the invention, the forward looking light source 2 and the rearward looking light source 5 are strobed at the same frequency. That is, the frequency at which the front-view light sources 2 are alternately turned on and off in sequence is the same as the frequency at which the rear-view light sources 5 are alternately turned on and off in sequence.
Specifically, the process from turning on to turning off of the front-view light source 2 and the process from turning off to turning on of the rear-view light source 5 are synchronous; the process from turning off to turning on of the front-view light source 2 and the process from turning on to turning off of the rear-view light source 5 are synchronous, so that the front-view light source 2 and the rear-view light source 5 are sequentially and alternately turned on or off.
For example, as shown in fig. 1, two front view light sources 2 and two rear view light sources 5 are exemplarily included, that is, the two front view light sources 2 are simultaneously on and off, that is, simultaneously on and off; the two rear view light sources 5 are simultaneously on and off, i.e. simultaneously on and off. When the two front view light sources 2 are turned on, the two rear view light sources 5 are turned off, and when the two front view light sources 2 are turned off, the two rear view light sources 5 are turned on. That is, the front view light source 2 and the rear view light source 5 are not turned on at the same time and are not turned off at the same time.
In one embodiment of the present invention, the strobing frequency of the front view light source 2 or the rear view light source 5 is half of the photographing time of the front view camera 1 or the rear view camera 6.
In one embodiment of the present invention, the strobe period of the front or rear light source 2, 5 is twice the shooting time of the front or rear camera 1, 6.
Specifically, the front camera 1 and the rear camera 6 are area-array cameras, the front camera 1 and the rear camera 6 are shot simultaneously, and the shooting time of the front camera 1 or the rear camera 6 includes the exposure time texposureAnd a reset time tresetI.e. the shooting time texposure+treset. Thus, the strobe frequency of the corresponding strobe light source (i.e., corresponding to the front light source 2 or the rear light source 5) is 1/2 (t)exposure+treset) The strobe period of the corresponding strobe light source is 2 (t)exposure+treset). In the shooting process, when the front-view light source 2 is lightened, the surface of the material 7 shot by the front-view camera 1 is bright, the surface of the material 7 shot by the rear-view camera 6 is dark, but a transmitted picture can be shot, and the collected transmitted light can effectively sort out impurities with high transmittance in the material 7. When the light source is viewed from the backWhen the rear-view camera 6 is lighted, the surface of the material 7 shot by the rear-view camera 6 is bright, the surface of the material 7 shot by the front-view camera 1 is dark, but a transmitted picture can be shot, and the collected transmitted light can effectively sort out impurities with high transmittance in the material 7.
In one embodiment of the invention, when the front camera 1 and the rear camera 6 shoot the material 7, the falling speed of the material 7 is determined by the width (i.e. the height in the up-down direction) of the view frame of the front camera 1 or the rear camera 6 on the material surface and the shooting time (t) of the front camera 1 or the rear camera 6exposure+treset) And (4) determining.
Specifically, as shown in fig. 2 and 3, fig. 2 shows an imaging schematic diagram of the material surface in the front camera 1, and fig. 3 shows an imaging schematic diagram of the material surface in the rear camera 6. The rectangular frame in fig. 2 and 3 is a field of view frame of the area-array camera, and indicates a range that the camera can see in one shot, and the width of the field of view frame of the camera on the material surface, that is, the width of the material 7 in the falling direction is L. In the embodiment of the invention, the falling speed of the material 7 is required, and in particular, the falling speed of the material 7 is L/2 (t)exposure+treset). Fig. 2 and 3 show the view change of the area-array camera during the falling of the material 7, the first picture of the two shows that the front-view camera 1 or the rear-view camera 6 views the same area of the material 7, but the front-view camera 1 illuminates the material surface with light, the rear-view camera 6 illuminates the material surface without light, and the front-view camera 1 and the rear-view camera 6 simultaneously shoot the picture of the area.
The second frame in FIGS. 2 and 3 shows the time t of one shotexposure+tresetThen, the material 7 falls by a distance of L/2, at this time, the front-view camera 1 and the rear-view camera 6 simultaneously shoot the same area of the material 7, the front-view camera 1 shoots pictures without light irradiating the material 7, namely, the material surface is dark, and the rear-view camera 6 shoots pictures with light irradiating the material 7, namely, the material surface is bright. The third and fourth frames in fig. 2 and 3 are similar to the first and second frames, and are not repeated here.
When the falling speed of the material 7 is L/2 (t)exposure+treset) When the material is placed in the storage box, the camera on each side can shoot a picture when the corresponding light source is turned on once and a picture when the corresponding light source is turned off once in the range of the L width, and the light source on the opposite side is turned off when the corresponding light source is turned on, so that a picture of the material 7 shot by the camera on the side is not influenced by the opposite light source, and the camera on the other side can shoot the condition of transmitted light of the material; when the light source on the side is turned off, the camera on the side can take a picture of the transmitted light on the material 7 illuminated by the light source on the opposite side, and the camera on the opposite side can take a picture of the reflection of the material 7. Then, at (t)exposure+treset) Then, the material 7 with the width of L leaves from the visual field of the camera, and the next material enters the visual field of the camera for detection and identification. Thus, when the falling speed of the material 7 is L/2 (t)exposure+treset) All materials can be detected and identified once without being influenced by opposite light rays and transmitted light once, and the identification effect is better because the cameras on the same side only receive the light rays reflected by the materials 7 on the same side through the light source on the same side.
The material sorting device provided by the embodiment of the invention works according to the flow, the identification and sorting of the materials 7 are completed, and because the light sources on two sides are exposed non-simultaneously, the light irradiated by the light source on the opposite side cannot be collected by the camera on the other side, namely, the cameras on two sides cannot be influenced by the light source on the opposite side, so that the detection, identification and sorting effects are improved; meanwhile, when the surface of the material 7 shot by the camera on one side is bright, the surface of the material 7 shot by the camera on the other side is dark, the camera on the dark side can shoot a projection picture of the light source on the opposite side penetrating through the material 7, impurities with high transmissivity in the material 7 can be effectively sorted out, for example, white transparent plastic sheets with high transmissivity are sorted out in the rice material, and the detection, identification and sorting effects are further improved.
In one embodiment of the invention, the forward looking light source 2 comprises a plurality of forward looking light units. A plurality of front view light units set up the one side at material 7, and a plurality of front view light units are lighted or are gone out simultaneously.
In one embodiment of the present invention, the rear view light source 5 includes: and a plurality of rear view light units corresponding to the plurality of front view light units one to one. A plurality of back vision light units set up the opposite side at material 7, and a plurality of back vision light units are lighted or are extinguished simultaneously.
Specifically, when a plurality of front view light units are turned on, a plurality of rear view light units are turned off, and when a plurality of front view light units are turned off, a plurality of rear view light units are turned on, thereby realizing that the front view light sources 2 and the rear view light sources 5 are sequentially and alternately turned on or turned off.
Specifically, the front light unit and the rear light unit are, for example, lamps having a stroboscopic function, and the stroboscopic frequencies of the front light unit and the rear light unit are the same. That is to say, the front-view light source 2 includes a plurality of fluorescent tubes with stroboscopic function, and the rear-view light source 5 includes a plurality of fluorescent tubes with stroboscopic function, and the stroboscopic frequency of both is the same to through the mode of two sides alternative illumination, improve material 7 and detect, discern and select separately the effect.
To sum up, this material detection device adopts two side-array cameras of front and back vision, adopts and shoots frequency assorted stroboscopic light source with the camera and throws light on to keep front and back vision all to unilateral illumination. In the detection, identification and sorting of the materials 7, the influence of bright rings caused by front and rear illumination can be effectively removed; meanwhile, the trouble that two sides of the material 7 cannot be identified by single-side illumination can be solved, and the identification range of the material 7 cannot be lost; in addition, when the single-side illumination light source is free of light, impurities with high transmission in the material 7 can be effectively sorted out; furthermore, by adopting a stroboscopic illumination light source, the power consumption of the color selector can be reduced, so that the energy is saved.
According to the material detection device provided by the embodiment of the invention, the front-view light sources 2 and the rear-view light sources 5 are symmetrically distributed on two sides of the material 7, the front-view light sources 2 and the rear-view light sources 5 are sequentially and alternately turned on or off, and the front-view camera 1 and the rear-view camera 6 are used for synchronously shooting the material 7, so that bilateral alternate illumination is realized, the adverse effect of the light sources on one side on the signal acquisition of the camera on the other side can be effectively eliminated in the detection, identification and sorting of the material 7, meanwhile, the problem that the two sides of the material 7 cannot be identified by single-side illumination can be solved, and theThe identification range of the material 7 can improve the detection, identification and separation effects of the material 7; finally, when the one-time shooting time is adjusted to be texposure+tresetThe strobe frequency is 1/2 (t)exposure+treset) When the falling speed is L/2 (t), the falling speed can be effectively adjustedexposure+treset) All the materials 7 are shot, and detection and identification of all the materials are achieved.
And the forward-looking light source 2 and the rear-looking light source 5 which are alternatively lightened or extinguished can shoot the transmitted photos, so that the impurities with high transmission in the materials 7 can be effectively sorted out, and the detection, identification and sorting effects of the materials 7 are further improved. For example, in the shooting process, when the front-view light source 2 is turned on, the surface of the material 7 shot by the front-view camera 1 is bright, the surface of the material 7 shot by the rear-view camera 6 is dark, and at the moment, the rear-view camera 6 can shoot a picture transmitted by the material 7, so that impurities with high transmission in the material 7 can be effectively sorted out. When rear view light source 5 lights, the surface of the material 7 that rear view camera 6 shot is bright, and the surface of the material 7 that forward view camera 1 shot is dark, and forward view camera 1 can shoot the photo of material 7 transmission to can effectively select the high impurity of transmission in the material 7, do benefit to further promotion material 7's detection, discernment and sorting effect.
A further embodiment of the present invention also proposes a color sorter 200.
Specifically, referring to fig. 4 and 5, in one example, the application of the material detection apparatus to the color sorter 200 will be further described.
The color sorter 200 according to the embodiment of the invention includes a feeding device 210, a channel 220, the material detecting device, a spraying valve 230 and a storage tank 240.
Material 7 enters channel 220 from feedway 210, wherein feedway 210 is arranged in making material 7 arrange one by one in proper order and get into channel 220 to material detection device detects material 7 one by one and discerns, thereby improves the success rate that look selection machine 200 screened the material.
For example, the feeding device 210 may be vibrated by a vibrator to sequentially arrange the materials 7 into the channel 220 one by one, in this embodiment, the channel 220 may be a chute, as shown in fig. 4, or a crawler, as shown in fig. 5, the chute is inclined at a certain angle in the horizontal direction to make the materials 7 enter the sorting area of the color sorter 200 at a uniform speed; while the tracks are arranged for uniform movement horizontally to allow the material 7 to enter the sorting area of the color sorter 200 at a consistent speed.
When the materials 7 are sorted into the sorting area, the material detection device is used for detecting and identifying the materials 7 entering the sorting area. For the working mode of the material detection device, please refer to the above contents, which are not described herein again.
In this embodiment, the material detection device triggers the spraying valve 230 to spray gas according to the detection and identification results, so as to blow off the coloring material and impurities, thereby realizing accurate separation of the material 7. And finally, the storage tank 240 is used for storing the material 7 and impurities after color selection.
According to the color sorter 200 provided by the embodiment of the invention, the front-view light sources 2 and the rear-view light sources 5 are symmetrically distributed on two sides of the material 7, the front-view light sources 2 and the rear-view light sources 5 are sequentially and alternately turned on or off, and the front-view camera 1 and the rear-view camera 6 are used for synchronously shooting the material 7, so that bilateral alternate illumination is realized, the adverse effect of the light sources on the other side camera signal acquisition during the detection, identification and sorting of the material 7 can be effectively eliminated, meanwhile, the problem that two sides of the material 7 cannot be identified by single-side illumination can be solved, the identification range of the material 7 cannot be influenced, and the detection, identification and sorting effects of the material 7 can be improved.
In addition, other configurations and functions of the color sorter 200 according to the embodiment of the present invention are known to those skilled in the art, and are not described in detail for reducing redundancy.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A material detection device, comprising:
the front-view light source and the rear-view light source are symmetrically distributed on two sides of the material and are sequentially and alternately turned on or off;
a front view camera disposed at a side of the front view light source and a rear view camera disposed at a side of the rear view light source, wherein,
the front-view camera and the rear-view camera are area-array cameras and are used for synchronously shooting the materials;
and the processing device is connected with the front-view camera and the rear-view camera and used for identifying the material according to the images obtained by the front-view camera and the rear-view camera.
2. The material detection device as recited in claim 1, wherein the forward and rear view light sources are stroboscopic light sources.
3. The material detection device as recited in claim 2, wherein the forward looking light source and the rearward looking light source are strobed at the same frequency.
4. The material detection device as claimed in claim 3, wherein the strobing frequency of the front or rear view light source is half of the shooting time of the front or rear view camera.
5. The material detection device as claimed in claim 4, wherein the forward or rear view light source has a strobe cycle twice as long as the shooting time of the forward or rear view camera.
6. The material detection device according to claim 4, wherein when the forward-looking camera and the rear-looking camera shoot the material, the falling speed of the material is determined by the width of a view frame of the forward-looking camera or the rear-looking camera on the material surface and the shooting time of the forward-looking camera or the rear-looking camera.
7. The material detection device of claim 1, wherein the forward looking light source comprises:
the material comprises a plurality of front view light units, wherein the plurality of front view light units are arranged on one side of the material and are simultaneously lightened or extinguished.
8. The material detection device of claim 7, wherein the rear view light source comprises:
and the plurality of rear-view light units are in one-to-one correspondence with the plurality of front-view light units, are arranged on the other side of the material, and are simultaneously lightened or extinguished.
9. The material detection device according to claim 8, wherein when the plurality of front view light units are turned on, the plurality of rear view light units are turned off, and when the plurality of front view light units are turned off, the plurality of rear view light units are turned on.
10. A colour selector comprising a material detection device as claimed in any one of claims 1 to 9.
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| CN201910904235.6A CN112620159A (en) | 2019-09-24 | 2019-09-24 | Material detection device and color sorter |
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| CN201910904235.6A CN112620159A (en) | 2019-09-24 | 2019-09-24 | Material detection device and color sorter |
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