CN107917723A - Small particle seed spreads induction device in a kind of sake laser - Google Patents
Small particle seed spreads induction device in a kind of sake laser Download PDFInfo
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- CN107917723A CN107917723A CN201711476301.1A CN201711476301A CN107917723A CN 107917723 A CN107917723 A CN 107917723A CN 201711476301 A CN201711476301 A CN 201711476301A CN 107917723 A CN107917723 A CN 107917723A
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- sake
- sensing device
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- 239000002245 particle Substances 0.000 title claims abstract description 28
- 230000006698 induction Effects 0.000 title claims abstract description 9
- 239000004020 conductor Substances 0.000 claims abstract description 65
- 230000007246 mechanism Effects 0.000 claims abstract description 7
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 25
- 229910052710 silicon Inorganic materials 0.000 claims description 25
- 239000010703 silicon Substances 0.000 claims description 25
- 230000008859 change Effects 0.000 claims description 11
- 238000009792 diffusion process Methods 0.000 claims description 4
- 230000003321 amplification Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 3
- 230000010354 integration Effects 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 238000001208 nuclear magnetic resonance pulse sequence Methods 0.000 claims 1
- 235000013339 cereals Nutrition 0.000 abstract description 50
- 238000001514 detection method Methods 0.000 abstract description 28
- 241000209140 Triticum Species 0.000 abstract description 2
- 235000021307 Triticum Nutrition 0.000 abstract description 2
- 240000008042 Zea mays Species 0.000 abstract description 2
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 abstract description 2
- 235000002017 Zea mays subsp mays Nutrition 0.000 abstract description 2
- 235000005822 corn Nutrition 0.000 abstract description 2
- 238000010899 nucleation Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 5
- 238000007689 inspection Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 230000002123 temporal effect Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 244000068988 Glycine max Species 0.000 description 1
- 235000010469 Glycine max Nutrition 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000003032 molecular docking Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 238000009331 sowing Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/36—Forming the light into pulses
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/005—Testing of complete machines, e.g. washing-machines or mobile phones
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- General Physics & Mathematics (AREA)
- Sowing (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention belongs to agricultural seed particle sensing detection technical field, and in particular to small particle seed spreads induction device in a kind of sake laser.The sensing device includes：Enter kind of a mouth, grain conductor, Laser emission module, photelectric receiver, go out kind of a mouth, signal acquiring system, power supply unit and package casing.Feed mechanism for seed charge seed mouth whereabouts seed stream through entering kind of mouth enter detection zone, irradiation is blocked to the fraction light path of the sake laser of the photelectric receiver, output voltage signal is set to produce disturbance, the digitlization by the processing of the signal acquiring system so as to fulfill kind of subflow.Sensing device provided by the invention has higher Detection accuracy and excellent economic and practical, can provide technical support for middle small particle seed (such as rape, wheat, corn seed) precise seeder seed-metering performance (amount of broadcasting, dropping frequency, broadcast leakage, qualified index etc.) detection.
Description
Technical field
The present invention relates to agricultural seed particle sensing detection technical field, more particularly to small particle kind in a kind of sake laser
Subflow sensing device.
Background technology
Mechanization precision drilling can reduce labor intensity, improve operating efficiency, increase farmers' income, and be intelligent agricultural machinery hair
The important step of exhibition.Feed mechanism for seed planting quality monitors in seeding process, broadcast leakage detects, the amount of broadcasting monitors, sowing state diagram generation is
The trend of precision drilling intelligent development, and realize these functions must rely on can real-time and precise collection dropping frequency, seeding
The seed of the seeding information such as time interval, seeding total amount spreads induction device as support.
The current photoelectric detector for being currently used for metering detection is mainly based upon photoelectric sending and receiving sensor and passes through by seed
Partition light path realizes the detection that kind of subflow is completed to the sensing of seed, and this kind of sensor is for corn and soybean, wheat, rice
Detection can be realized etc. big-and-middle particle diameter seed.But for the middle small particle seed metering detection that particle diameter is smaller, dropping frequency is higher,
Due to causing missing inspection there are certain check frequency, and since seed is longer by the light path time, cause detection time point
Resolution is low and occurs being separated by nearer two or the problems such as more seeds are difficult to be resolved, ultimately result in and be difficult to realize centering granule
The accurate detection of footpath kind subflow.
The content of the invention
Therefore, for the problem present on, the present invention provides small particle seed in a kind of sake laser and spreads induction device,
It can realize to the detection of kind of subflow non-blind area, and improve kind of a subflow detection time resolution ratio, overcome two or more seeds because of phase
Every close and undetectable problem.
To solve the above problems, technical solution provided by the invention is as follows：
The present invention provides small particle seed in a kind of sake laser and spreads induction device, the mouth of charging seed with middle small particle feed mechanism for seed
Docking, the sensing device include：Grain conductor, Laser emission module, photelectric receiver, signal acquiring system and power supply are single
Member；
The grain conductor includes the upper grain conductor that is coaxially disposed and lower grain conductor, the upper surface of the lower grain conductor with it is described
There are thang-kng gap between the lower face of upper grain conductor；
The Laser emission module thang-kng gap setting corresponding with the photelectric receiver is in the two of the grain conductor
Side, the Laser emission module axis vertical take-off are described sharp to receive in the photelectric receiver center, the photelectric receiver
The sake laser that light emitting module is formed in the thang-kng gap location；
The photelectric receiver is electrically connected with the signal acquiring system, the signal acquiring system and the Laser emission
Module is electrically connected with said supply unit；
Wherein, the sake laser has a preset thickness, and the lower nozzle internal diameter of the upper grain conductor is along grain conductor axial direction side
To projection positioned at can be irradiated in the sake laser region of photelectric receiver, the signal acquiring system is for gathering
Seed stream through the sake laser cause the photelectric receiver sensitive volume change generation voltage signal disturbance.
According to one preferred embodiment of the present invention, the Laser emission module includes laser emitter, condenser lens and one
Word wave mirror, the laser emitter to launch dot laser, and via the focusing lens and the word wave eyeglass after
The sake laser in diffusion type that photosphere thickness is 0.5mm~3mm is produced in the thang-kng gap location.
According to one preferred embodiment of the present invention, the laser emitter is formed described thin in the position in the thang-kng gap
The diffusion angular region of face laser is between 10 °~160 °.
According to one preferred embodiment of the present invention, the upper surface of the lower grain conductor and the upper grain conductor it is described under
End face sets the thang-kng gap of 0.5mm~3mm.
According to one preferred embodiment of the present invention, the photelectric receiver is silicon photocell, and photosensitive with the silicon photocell
Region is sensitive area at the maximum length of face.
According to one preferred embodiment of the present invention, the laser emitter apart from the distance on the silicon photocell surface in 6mm
Between~60mm, the sake laser at least covers the sensitive area in the hot spot that the silicon photocell surface is formed.
According to one preferred embodiment of the present invention, the lower nozzle internal diameter of the upper grain conductor, which is less than, can be irradiated to the light
The full-size that the sake laser in area can accommodate.
According to one preferred embodiment of the present invention, the upper orifice internal diameter of the lower grain conductor is less than or equal to lower nozzle internal diameter, institute
The upper orifice internal diameter for stating lower grain conductor is more than the lower nozzle outside diameter of the upper grain conductor.
According to one preferred embodiment of the present invention, the sensing device further includes：Enter kind of a mouth, go out kind of mouth and package casing；
It is described enter kind of mouth extended to form by the upper orifice of the upper grain conductor, it is described go out kind of mouth by under the lower grain conductor
The mouth of pipe extends to form；It is described enter kind of mouth outside diameter docked with mouthful internal diameter matching of charging seed；The package casing is protecting inside
Structure, the internal structure is packaged as a whole.
According to one preferred embodiment of the present invention, the signal acquiring system circuit includes level-one amplifying circuit, two level is amplified
Circuit, half-wave rectifying circuit, voltage comparator circuit, single-shot trigger circuit；
The level-one amplifying circuit and the second amplifying circuit are built by AD620 chips, for being blocked to seed
The photosignal produced after the light path of part is amplified, and is 10~200 times per level-one amplification factor adjustable range；
The negative sense that the half-wave rectifying circuit exports the second amplifying circuit using the unilateal conduction effect of diode
Voltage signal carries out copped wave；
The voltage comparator circuit includes LM393 chips, variable resistor, and the variable resistor is adjusting comparison voltage threshold
Value, is transformed into the regular square wave with certain pulse width, the pulse width by the output signal of the half-wave rectifying circuit
Change with the change of the comparison voltage threshold value；
The single-shot trigger circuit include 74LS123 chips, capacitance, resistance, by select different capacitances, resistance to
Change delay time, and the pulse signal by the output signal integration of comparator into rule, it is single to realize that single seed corresponds to output
A pulse, that is, realize that kind of a subflow sequence pair answers pulse train, the final digitlization for realizing kind of subflow.
Beneficial effects of the present invention are：Compared to existing photoelectric detection system, small particle kind in sake laser of the invention
Subflow sensing device, by by the point-like light of laser emitter by focusing lens and a word wave mirror processing after, formation by
After the sake laser that line source diffusion produces is irradiated to silicon photocell surface, rectangular hot spot is formd, spot width is only
1mm, makes seed sufficiently small by the time of sake laser, can accurately be detected when interval is more than 1mm between seed, improve inspection
The temporal resolution of survey.Improve and infrared diode light source used in traditional Photoelectric Detection, seed by detection light area when
Between it is longer, when two or more at the same time into light incidence section when, the problem of can not distinguishing and cause flase drop；The design not only has
There is the advantages of non-contact detection, and grain conductor internal diameter size is calculated and relative to thin by stringent geometry model
The specific location relation of face laser pair, and the relative position of laser emitter and silicon photocell, eliminate check frequency.This dress
Putting can realize that single seed corresponds to output individual pulse, that is, realizes that kind of a subflow sequence pair answers pulse train, finally realize seed
The digitlization of stream.Component cost is relatively low used in the present apparatus, and compact structure is easy for installation.And the present apparatus is less than particle diameter
The big-and-middle particle diameter seed of 10mm equally can be detected accurately.
Brief description of the drawings
, below will be to embodiment or the prior art in order to illustrate more clearly of embodiment or technical solution of the prior art
Attached drawing is briefly described needed in description, it should be apparent that, drawings in the following description are only some invented
Embodiment, for those of ordinary skill in the art, without creative efforts, can also be attached according to these
Figure obtains other attached drawings.
Fig. 1 is small particle seed stream sensing device structure diagram in sake laser provided by the invention；
Fig. 2 a are Laser emission provided in an embodiment of the present invention with receiving perspective view；
Fig. 2 b are Laser emission provided in an embodiment of the present invention and the schematic perspective view received；
Fig. 3 is signal acquiring system circuit block diagram provided in an embodiment of the present invention；
Embodiment
The explanation of following embodiment is with reference to additional diagram, to illustrate the particular implementation that the present invention can be used to implementation
Example.The direction term that the present invention is previously mentioned, such as [on], [under], [preceding], [rear], [left side], [right side], [interior], [outer], [side]
Deng being only the direction with reference to annexed drawings.Therefore, the direction term used is to illustrate and understand the present invention, and is not used to
The limitation present invention.In figure, the similar unit of structure is with being given the same reference numerals.
When the present invention is applied to the sensing detection of middle small particle seeding kind subflow for existing photoelectric detection system, because existing
Certain check frequency causes missing inspection and causes the low technical problem of detection time resolution ratio because the thang-kng time is long, this implementation
Example can solve the defect.
Small particle seed in the sake laser of specific embodiment of the invention offer is provided below in conjunction with the accompanying drawings and spreads sense
Device.
As shown in Figure 1, be small particle seed stream sensing device structure diagram in sake laser provided by the invention, the biography
Induction device is docked with the mouth of charging seed of middle small particle feed mechanism for seed, and the sensing device includes：Enter kind of mouth 1, grain conductor, Laser emission mould
Group 3, photelectric receiver 4, go out kind of mouth 7, stent 8, signal acquiring system 10, power supply unit 11.
Wherein, it is described enter kind of mouth 1 outside diameter and the feed mechanism for seed the mouth of charging seed internal diameter matched design, to by institute
Sensing device is stated to be connected on the feed mechanism for seed, and it is described enter 1 outer wall of kind of mouth be provided with antiskid thread, with ensure install after do not go out
The phenomenon now to come off.The grain conductor includes upper grain conductor 2 and the lower grain conductor 6, the upper grain conductor 2 with it is described under lead
Kind pipe 6 is coaxially disposed；The upper orifice of the upper grain conductor 2 is extended with formed it is described enter kind of mouth 1, by under the lower grain conductor
Mouth of pipe extension with formed it is described go out kind of mouth 7.The length of the upper grain conductor 2 can be 20mm~40mm, the length of the lower grain conductor 6
Degree can be 20mm~40mm.There are between thang-kng between the upper surface of the lower grain conductor 6 and the lower face of the upper grain conductor 2
Gap.The upper orifice internal diameter of the lower grain conductor 6 is more than the lower nozzle outside diameter of the upper grain conductor 2, ensures what is fallen
Seed smoothly enters in the lower grain conductor 6；The upper orifice internal diameter of the lower grain conductor 6 is less than or equal to lower nozzle internal diameter；It is preferred that
, it is in the taper shunk from bottom to top that the lower nozzle internal diameter of the lower grain conductor 6, which is more than upper orifice internal diameter, prevents seed from falling
Collide the possibility for causing to be detected repeatedly after lower.
The Laser emission module 3 thang-kng gap setting corresponding with the photelectric receiver 4 is in the grain conductor
Both sides, the axis vertical take-off of the Laser emission module 3 in the center of the photelectric receiver 4, and the photelectric receiver 4 to
The sake laser 5 that the Laser emission module 3 is formed in the thang-kng gap location is received, the thickness of the sake laser 5 is
0.5mm~3mm, is preferably 1mm.Projection 501 of the lower nozzle internal diameter of the upper grain conductor 2 along the grain conductor axial direction
Yu Suoneng is irradiated in 5 region of sake laser of the photelectric receiver 4, the lower grain conductor 6 and the upper grain conductor 2
Between thang-kng clearance distance be 0.5mm~3mm, it is preferred that the width in the thang-kng gap is 0.8mm~2.5mm.It is same excellent
Choosing, the upper orifice internal diameter of the upper grain conductor 2 is more than lower nozzle internal diameter in the taper shunk from top to bottom, the projection
501 in 5 region of sake laser, check frequency is avoided with this.The cross sectional shape of the grain conductor is circular, oval
Shape, rectangle or other polygons.
The stent 8 includes positioning column 12, to fixation to carry the signal acquiring system 10 on the stent 8
The signal acquiring system 10；Include NRF transceiver modules 9 on the signal acquiring system 10, for exporting the kind subflow of detection
Data；To power to described device, the photelectric receiver 4 is electrically connected said supply unit 11 with the signal acquiring system 10
Connect, the signal acquiring system 10 and the Laser emission module 3 are electrically connected with said supply unit 11.The signal acquisition system
System 10 is used to gathering seed stream causes 4 sensitive volume of photelectric receiver to change the electricity of generation through the sake laser 5
Press signal disturbance；The signal acquiring system 10 and said supply unit 11 are arranged on the right side of the grain conductor.The sensing
Device further includes：Seeding status indicator lamp 13, to indicate the seeding state of described kind of subflow；Power switch 14, to open/
Close the sensing device；Power supply indicator 15, to indicate power supply state.The sensing device further includes package casing, institute
Package casing is stated to protect above-mentioned each internal structure, the internal structure is packaged as a whole.Wherein, the seeding state
Indicator light 13, power switch 14, power supply indicator 15 are arranged at the predeterminated position of the package casing according to actual conditions, herein
Do not limit.
As shown in Figure 2 a, it is Laser emission provided in an embodiment of the present invention with receiving perspective view, Laser emission module 3 is along light
The road direction of the launch includes laser emitter 301, condenser lens 302, a word wave mirror 303 successively；Photelectric receiver may be selected to be
Silicon photocell 4, the present embodiment are the silicon photocell 4 of 10mm × 10mm, and the smooth surface of the silicon photocell 4 swashs towards described
Light emitting module 3 is set；The laser emitter 301 is coaxially set with the condenser lens 302 and the word wave mirror 303
Put, and central axis is orthogonal to the center of the silicon photocell 4.Wherein, the point light source that the laser emitter 301 is launched is successively
Formed by the condenser lens 302 and the word wave mirror 303 with certain angle of flare and the intensive sake laser of light path
5, the angle of flare of the sake laser 5 is preferably 30 °, the light area that the sake laser 5 is formed is between 10 °~160 °
One trapezoid area.
As shown in Figure 2 b, swash for Laser emission provided in an embodiment of the present invention and the schematic perspective view of reception, the sake
The photosphere thickness that light 5 is formed is 0.5mm~3mm, is preferably 1mm.The lower nozzle internal diameter of upper grain conductor 2 is less than or equal to the sake
The maximum circular diameter that the light area that laser 5 is formed can accommodate, that is to say, that the lower nozzle internal diameter edge of the upper grain conductor 2
The projection of grain conductor axial direction is in the region of the sake laser 5.In order to improve the length of 4 smooth surface of silicon photocell into
And increase the size of the lower nozzle internal diameter of the upper grain conductor 2, the silicon photocell 4 is rotated by a certain angle and is put, preferably with
The photosphere that the sake laser 5 is formed is put in 45 °, using the diagonal region of 4 smooth surface of silicon photocell as
Sensitive area, laser emitter 301 apart from 4 surface of silicon photocell distance between 6mm~60mm, be preferably 23mm.Institute
State after the point-like light of laser emitter 301 handled by 302 and one word wave mirror 303 of focusing lens, be irradiated to the silicon photoelectricity
4 surface of pond forms rectangular light spot, and the spot width is very small, and width is between 0.5mm~3mm, preferably 1mm, the light
Projection of the spot on the silicon photocell 4 is located in the range of the sensitive area, ensures the kind through the sake laser 5 with this
Son 16 is all sensed.
By geometric operation draw when the laser emitter 301 apart from 4 smooth surface of silicon photocell distance be 23mm
When, the spot length for impinging upon 4 surface of silicon photocell is 14.1mm, and it is diagonal that the silicon photocell 4 is just completely covered
Line region；The diameter that the trapezoidal smooth area can accommodate greatest circle is 11.1mm, therefore planting caliber must be straight
Footpath is necessarily less than 11.1mm, and the lower nozzle internal diameter of the upper grain conductor 2 of the invention is preferably 10mm, is so just eliminated
The issuable blind area of detection institute.When the photosphere thickness is only 1mm, middle small particle seed 16 passes through the time in the smooth area
It is sufficiently small, it can be detected as long as two seed spacing are more than 1mm, in the actual seeding process of agricultural, seed interval is less than
The situation of 1mm seldom occurs, and therefore, the present invention improves the temporal resolution of Seed inspection, and small particle seed is accurate in realization
Detection.In order to increase time for using of apparatus of the present invention after once charging, the laser emitter 301 selects the lowest power consumption to be only
The laser emitter of 5mW is as light source.
As shown in figure 3, present invention additionally comprises signal acquiring system circuit, the signal acquiring system circuit is integrated in signal
In acquisition system.The signal acquiring system circuit includes level-one amplifying circuit 200, second amplifying circuit 300, halfwave rectifier electricity
Road 400, voltage comparator circuit 500, single-shot trigger circuit 600.The level-one amplifying circuit 200 and the second amplifying circuit
300 are built by AD620 chips, for being amplified to the photosignal of the generation after kind of subflow shield portions light path, often
Level-one amplification factor adjustable range is 10~200 times, is preferably 30~100 times；The half-wave rectifying circuit 400 utilizes diode
Unilateal conduction effect to the second amplifying circuit 300 output negative voltage signal carry out copped wave；The voltage is more electric
Road 500 includes LM393 chips, variable resistor, and the variable resistor is to adjust comparison voltage threshold value, by halfwave rectifier electricity
Road 400 exports signal and is transformed into the regular square wave with certain pulse width, and the pulse width is with the comparison voltage threshold value
Change and change；The single-shot trigger circuit 600 includes 74LS123 chips, capacitance, resistance, by selecting different capacitances
For resistance to change delay time, delay time is preferably 1ms, and the pulse of the output signal integration of comparator into rule is believed
Number.The pulse train 700 of described kind of subflow is formed, realizes that single seed corresponds to output individual pulse, that is, realizes kind of a subflow sequence
Respective pulses sequence, the final digitlization for realizing kind of subflow.In another embodiment, the level-one amplifying circuit 200 with it is described
Second amplifying circuit 300 can be replaced with single-stage amplifying circuit.
Compared to existing photoelectric detection system, small particle seed spreads induction device in sake laser of the invention, pass through by
After the point-like light of laser emitter is by focusing lens and word wave mirror processing, being produced by the line source spread for formation is thin
After face laser is irradiated to silicon photocell surface, rectangular hot spot is formd, spot width is only 1mm, seed is passed through light area
Time it is sufficiently small, interval can be accurately detected when being more than 1mm between seed, improve the temporal resolution of detection.Improve
Common infrared diode light source in traditional Photoelectric Detection, seed is longer by the time in detection light area, when two or more
Grain at the same time into light incidence section when, the problem of can not distinguishing and cause flase drop；The design is not only excellent with non-contact detection
Point, and grain conductor internal diameter size and the specific location relative to sake laser pair are calculated by stringent geometry model
Relation, and the relative position of laser emitter and silicon photocell, eliminate check frequency.Component cost used in the present apparatus compared with
Low, compact structure is easy for installation.The present apparatus equally can accurately detect big-and-middle particle diameter seed of the particle diameter less than 10mm.
In conclusion although the present invention is disclosed above with preferred embodiment, above preferred embodiment simultaneously is not used to limit
The system present invention, those of ordinary skill in the art, without departing from the spirit and scope of the present invention, can make various changes and profit
Decorations, therefore protection scope of the present invention is subject to the scope that claim defines.
Claims (10)
1. small particle seed spreads induction device in a kind of sake laser, docked with the mouth of charging seed of middle small particle feed mechanism for seed, its feature
It is, including：Grain conductor, Laser emission module, photelectric receiver, signal acquiring system and power supply unit；
The grain conductor includes the upper grain conductor that is coaxially disposed and lower grain conductor, the upper surface of the lower grain conductor with it is described on lead
There are thang-kng gap between the lower face of kind pipe；
The Laser emission module thang-kng gap setting corresponding with the photelectric receiver is in the both sides of the grain conductor, institute
Laser emission module axis vertical take-off is stated in the photelectric receiver center, the photelectric receiver is receiving the Laser emission
The sake laser that module is formed in the thang-kng gap location；
The photelectric receiver is electrically connected with the signal acquiring system, the signal acquiring system and the Laser emission module
It is electrically connected with said supply unit；
Wherein, the sake laser has a preset thickness, and the lower nozzle internal diameter of the upper grain conductor is along grain conductor axial direction
Positioned at that can be irradiated in the sake laser region of photelectric receiver, the signal acquiring system is used to gather seed for projection
Flow through the sake laser cause the photelectric receiver sensitive volume change generation voltage signal disturbance.
2. sensing device according to claim 1, it is characterised in that the Laser emission module include laser emitter,
Condenser lens and a word wave mirror, the laser emitter is to launch dot laser, and via focusing lens and described
One word wave eyeglass produces the sake laser that photosphere thickness is 0.5mm~3mm after the thang-kng gap location.
3. sensing device according to claim 2, it is characterised in that the laser emitter is in the position in the thang-kng gap
The diffusion angular region for the sake laser to be formed is put between 10 °~160 °.
4. sensing device according to claim 1, it is characterised in that the upper surface of the lower grain conductor with it is described on
The lower face of grain conductor sets the thang-kng gap of 0.5mm~3mm.
5. sensing device according to claim 1, it is characterised in that the photelectric receiver is silicon photocell, and with institute
It is sensitive area to state region at silicon photocell photosurface maximum length.
6. sensing device according to claim 5, it is characterised in that the laser emitter is apart from the silicon photocell table
Between 6mm~60mm, the sake laser at least covers described the distance in face in the hot spot that the silicon photocell surface is formed
Sensitive area.
7. sensing device according to claim 6, it is characterised in that the lower nozzle internal diameter of the upper grain conductor is less than institute's energy
It is irradiated to the full-size that the sake laser of the sensitive area can accommodate.
8. sensing device according to claim 1, it is characterised in that the upper orifice internal diameter of the lower grain conductor is less than or equal to
Lower nozzle internal diameter, the upper orifice internal diameter of the lower grain conductor are more than the lower nozzle outside diameter of the upper grain conductor.
9. sensing device according to claim 1, it is characterised in that the sensing device further includes：Enter kind of a mouth, go out kind of a mouth
And package casing；
It is described enter kind of mouth extended to form by the upper orifice of the upper grain conductor, it is described go out kind of mouth by the lower grain conductor lower nozzle
Extend to form；It is described enter kind of mouth outside diameter docked with mouthful internal diameter matching of charging seed；The package casing to protect internal structure,
The internal structure is packaged as a whole.
10. sensing device according to claim 1, it is characterised in that the signal acquiring system circuit is put including level-one
Big circuit, second amplifying circuit, half-wave rectifying circuit, voltage comparator circuit, single-shot trigger circuit；
The level-one amplifying circuit and the second amplifying circuit are built by AD620 chips, for seed shield portions
The photosignal produced after light path is amplified, and is 10~200 times per level-one amplification factor adjustable range；
The negative voltage that the half-wave rectifying circuit exports the second amplifying circuit using the unilateal conduction effect of diode
Signal carries out copped wave；
The voltage comparator circuit include LM393 chips, variable resistor, the variable resistor to adjust comparison voltage threshold value,
The output signal of the half-wave rectifying circuit is transformed into the regular square wave with certain pulse width, the pulse width is with institute
State the change of comparison voltage threshold value and change；
The single-shot trigger circuit includes 123 chips of 74LS, capacitance, resistance, by selecting different capacitances, resistance changing
Become delay time, and the output signal integration of comparator is become and kind of the corresponding pulse sequence signal of subflow sequence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711476301.1A CN107917723B (en) | 2017-12-29 | 2017-12-29 | Small-particle-size seed flow sensing device in thin-surface laser |
Applications Claiming Priority (1)
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| CN110558007A (en) * | 2019-10-12 | 2019-12-13 | 华中农业大学 | small-particle-size seed particle flow counting sensing device suitable for high-frequency seed metering |
| CN110595553A (en) * | 2019-09-18 | 2019-12-20 | 华中农业大学 | LED visible light surface large and medium seed crop seed metering detection device |
| CN110646019A (en) * | 2019-09-18 | 2020-01-03 | 华中农业大学 | Seed crop seed metering detection device |
| CN110889486A (en) * | 2019-11-07 | 2020-03-17 | 北京农业智能装备技术研究中心 | Insect occurrence situation acquisition system and method |
| CN112881340A (en) * | 2021-01-12 | 2021-06-01 | 华中农业大学 | General sensing device of refraction type thin-surface laser seed flow |
| CN113039901A (en) * | 2021-03-30 | 2021-06-29 | 华中农业大学 | Digital seed sowing device based on seed sowing frequency feedback and seed sowing control method |
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| CN114128444A (en) * | 2021-11-26 | 2022-03-04 | 中国农业大学 | Laser sensing-based precision seeding parameter wireless remote monitoring method and device |
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| CN113390466A (en) * | 2021-07-02 | 2021-09-14 | 华中农业大学 | Method for collecting seeding quality information of seeds with medium and small particle diameters and monitoring operation state of machine tool |
| CN114128444A (en) * | 2021-11-26 | 2022-03-04 | 中国农业大学 | Laser sensing-based precision seeding parameter wireless remote monitoring method and device |
| CN114128444B (en) * | 2021-11-26 | 2023-08-22 | 中国农业大学 | Precise seeding parameter wireless remote monitoring method and device based on laser sensing |
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