CN106856808A - Combine Harvester Grain flow detector and measuring method - Google Patents
Combine Harvester Grain flow detector and measuring method Download PDFInfo
- Publication number
- CN106856808A CN106856808A CN201510917623.XA CN201510917623A CN106856808A CN 106856808 A CN106856808 A CN 106856808A CN 201510917623 A CN201510917623 A CN 201510917623A CN 106856808 A CN106856808 A CN 106856808A
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- Prior art keywords
- cereal
- detection means
- charge
- signal
- flow
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Classifications
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01D—HARVESTING; MOWING
- A01D41/00—Combines, i.e. harvesters or mowers combined with threshing devices
- A01D41/12—Details of combines
- A01D41/127—Control or measuring arrangements specially adapted for combines
- A01D41/1271—Control or measuring arrangements specially adapted for combines for measuring crop flow
- A01D41/1272—Control or measuring arrangements specially adapted for combines for measuring crop flow for measuring grain flow
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- Life Sciences & Earth Sciences (AREA)
- Environmental Sciences (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention belongs to united reaper field yield detection technique field, specifically related to a kind of Combine Harvester Grain flow detector and measuring method, detection means is arranged on harvester elevator exit, and be mainly used in harvester carries out real-time detection in farm work to cereal flow.The present apparatus is mainly made up of PVDF piezoelectric membranes, bearing plate, adjusting bracket, fixed mount, charge amplifier, acquisition module.When on cereal impact PVDF piezoelectric membranes, the two poles of the earth of PVDF piezoelectric membranes are made to produce electric charge.Be amplified for this electric charge and exported with normal voltage by charge amplifier.The voltage of acquisition module Real-time Collection charge amplifier output, converted treatment obtains grain stream value, and result is exported with digital communication mode.Certainty of measurement of the present invention is high, and anti-interference energy is strong, realizes the real-time detection to cereal flow.
Description
Technical field
The invention belongs to united reaper field yield detection technique field, and in particular to a kind of united reaper
Cereal flow detection means and measuring method.
Background technology
The collection of field information is the primary link in precision agriculture technology practice process, particularly crop yield
The acquisition of information is particularly important.It is to implement " precision agriculture " because setting up crop yield spatial diversity distribution map
Starting point, it is result of the plant growth under numerous environmental factors and farmland production control measures combined influence,
It is that Scientific Regulation puts into and formulate the basis of administrative decision measure during realizing crop production.Cereal flow is passed
Sensor is the core component in system for measuring yield.The cereal flow transducer of application mainly has four types at present：
That is impulse type flow sensor, ray type flow sensor, photoelectric flow rate transducer and volumetric flow
Sensor.
Photoelectric flow rate transducer certainty of measurement is piled up distribution shape and is influenceed larger by cereal in elevator,
Probe is also easily contaminated, it is necessary to often clean, performance is not sufficiently stable simultaneously；Ray type flow sensor
Certainty of measurement is higher, but radiation has certain harm to operating personnel and environment, and use cost is higher, one
Determine to hinder large scale application in degree；Volumetric flow sensor its huge structure, chi is installed by it
Very little limitation, not only installation difficulty, and directly influenceed greatly by factors such as cereal density.
Other three kinds cereal flow transducers are contrasted, impulse type flow sensor is relatively to be adapted to be surveyed in field
Applied in product system, impulse type flow sensor is employed mostly in the commercialization system for measuring yield of the state such as America and Europe.
But impulse type flow sensor also has weak point：Easily interference vibrated, certainty of measurement is not high.
Therefore, develop that a kind of certainty of measurement is high, strong antijamming capability cereal flow detection means is necessary.
The content of the invention
The purpose of the present invention is directed to above-mentioned the deficiencies in the prior art, there is provided a kind of certainty of measurement is high, anti-interference
Ability is strong, the good Combine Harvester Grain flow detector of real-time and measuring method.
The technical scheme that is used to achieve the above object of the present invention is：A kind of Combine Harvester Grain flow inspection
Device is surveyed, including：
Sensor assembly, is arranged at the exit of united reaper elevator, for cereal impulsive force to be changed
It is charge signal；
Signal acquisition process module, the charge signal for being detected according to sensor assembly calculates grain stream
Amount；
Stuck-module is installed, for the detection means to be fixed on into elevator exit.
The sensor assembly includes PVDF piezoelectric membranes, damping material and loading plate；
The PVDF piezoelectric membranes are pasted onto on damping material, for cereal impulsive force to be converted into electric charge letter
Number output；
The damping material is pasted onto between PVDF piezoelectric membranes and loading plate, for suppressing to vibrate；
The loading plate is pasted together with the damping material, is damping material and PVDF piezoelectric membranes
Immobilization carrier.
The thickness of the damping material is that the effect that in the environment for being used suppression can vibrate reaches most preferably
Thickness.
The signal acquisition process module includes charge amplifier and Acquisition Circuit；
Be amplified for electric charge and exported with normal voltage by the charge amplifier；
The Acquisition Circuit is core with 32 embeded processors, is exported for Real-time Collection charge amplifier
Voltage, converted treatment obtains grain stream value, and result is exported with digital communication mode.
The installation stuck-module includes adjusting bracket and fixed mount；
Described adjusting bracket one end is connected with loading plate, and the other end is connected with fixed mount, for adjusting detection means
Setting height(from bottom) and angle；
Described fixed mount one end is fixed by bolt with tanker, and the other end and adjusting bracket are connected.
A kind of Combine Harvester Grain flow-measuring method, comprises the following steps：
S1：Cereal flow detection means is arranged on harvester elevator exit, is spilled over intercepting cereal
Impulsive force afterwards；
S2：According to piezo-electric effect, electric charge can be produced in its plane of polarization after sensor assembly stress, and by pin
Shape metal terminal is drawn；
S3：Charge amplifier treatment in the electric charge feeding signal acquisition process module that sensor assembly is exported,
Charge signal is after the LPF of charge amplifier and conversion with the voltage output of certain amplitude；
S4：Acquisition Circuit in signal acquisition process module detects the output voltage signal of charge amplifier, so
Afterwards according to cereal flow and the relation of voltage signal, actual cereal flow is calculated.
The relation according to cereal flow and voltage signal, calculates actual cereal flow, specially：
Q=-0.01369v2+0.5661v-0.1147
Wherein, q is cereal flow, and v is voltage signal.
The present invention has advantages below and beneficial effect：
1.PVDF piezoelectric membranes are both the sensing element and flexible member of cereal flow transducer, eliminate bullet
The design of property element, high with sensitivity, the linearity is good, the characteristics of simple structure.
2. damping material can be added on cereal flow transducer, vibration interference is restrained effectively.
3. signal processing method is simple, mainly for the high-frequency random noises in cereal flow signal.
Brief description of the drawings
Fig. 1 is cereal flow detection means scheme of installation；
Fig. 2 is the structural representation of cereal flow detection means；
Fig. 3 is rigid bearing plate schematic diagram；
Fig. 4 is adjusting bracket structural representation；
Fig. 5 is fixed mount structural scheme of mechanism；
Fig. 6 is cereal flow detection means setting height(from bottom) adjustment schematic diagram；
Fig. 7 is cereal flow detection means setting angle adjustment schematic diagram；
Fig. 8 is the theory diagram of charge amplifier；
Fig. 9 is the hardware structure diagram of acquisition module.
Specific embodiment
Below in conjunction with the accompanying drawings and embodiment the present invention is described in further detail.
Fig. 1 is cereal flow detection means scheme of installation.Schematic diagram includes：Tanker top 1, cereal 2,
Lifter 3, bolt 4, cereal flow detection means 5.Fig. 2 is the structural representation of cereal flow detection means
Figure.Cereal flow detection means is specifically included：It is PVDF piezoelectric membranes 6, bearing plate 7, adjusting bracket 8, solid
Determine frame 9, charge amplifier 10, acquisition module 11, shielding line 12.Cereal flow detection means 5 is by adjusting
Section frame 8, fixed mount 9 and bolt 4 are arranged on tanker top 1, near the exit of harvester elevator 3,
Cereal 2 impacts PVDF piezoelectric membranes 6, the electric charge of PVDF piezoelectric membranes 6 after being spilled over.Charge amplifier
10 are amplified with normal voltage output this small electric charge.The Real-time Collection electric charge of acquisition module 11 amplifies
The voltage of the output of device 10, converted treatment obtains grain stream value, and result is defeated in CAN communication mode
Go out.
According to the outlet size of lifter 3, the size of PVDF piezoelectric membranes 6 can be designed.PVDF piezoelectricity is thin
Film 7 is the sensing element of detection means, is shaped as rectangle.Whole PVDF piezoelectric membrane 6 pastes bearing plate 7
On, it is connected with charge amplifier 10 by shielding line 13, the output of charge amplifier is further through shielding line 12
It is connected with acquisition module 11.
Fig. 3 is bearing plate schematic diagram.Bearing plate 7 mainly includes bearing plate 7a and contiguous block 7b.Bearing plate
7a is shaped as rectangle, length-width ratio PVDF piezoelectric membranes big 2-5mm, thickness 0.8-1.5mm, and material is not for
Elegant steel plate；Contiguous block 7b is welded on the length direction middle and lower part of bearing plate 7a, has an axis hole 7b-1 in the middle of it,
And be provided with according to the location hole 7b-2 of circumferential arrangement around axis hole.
Fig. 4 is adjusting bracket structural representation.One end of adjusting bracket 8 is provided with 2 large through-hole 8a, other end tool
There is an axis hole 8b, with axis hole as the center of circle, radius is 20mm, central angle is uniform 5 on 40 ° of arc
Small through hole 8c.
Fig. 5 is fixed mount structural scheme of mechanism.9 one-tenth T fonts of fixed mount, including level board 9a and vertical panel
9b.The level board 9a on its top is provided with fixing hole 9a-1, for being connected with grain box of harvester top 1；Under
Some location hole 9b-1 are provided with the vertical panel 9b in portion in its longitudinal direction.
Fig. 6 is cereal flow detection means setting height(from bottom) adjustment schematic diagram.Change and arbitrarily positioned on fixed mount 9
Then hole 9b-1 is fastened with 2 large through-hole 8a aligned positions on adjusting bracket 8 with bolt 13, nut 14,
The relative position of fixed mount 9 and adjusting bracket 8 on direction perpendicular to the ground is changed, and then adjust detection
Device 5 at the top of tanker 1 setting height(from bottom).
Fig. 7 is cereal flow detection means setting angle adjustment schematic diagram.The axis hole 7b-1 of contiguous block 7b with
The axis hole 8b of adjusting bracket 8 is hinged by bolt 16 and nut 17, and bolt 16, nut 17 are applied
Plus the appropriate pretightning force of adjustment makes to be relatively rotated between bearing plate 7 and adjusting bracket 8；Rotation makes contiguous block
After small through hole 8c at least 2 on the location hole 7b-2 of 7b and adjusting bracket 8 is concentric, by alignment pin 17
The relative angle of rigid bearing plate 7 and adjusting bracket 8 is pinned, and then adjustment detection means 5 is 1 at the top of tanker
Setting angle.
Fig. 8 is the theory diagram of charge amplifier.Because piezoelectric membrane output is less electric charge, it is necessary to incite somebody to action
It is amplified.The faint charge signal that sensor is exported can be converted into charge amplifier the voltage of amplification
Signal.Whole charge amplifier mainly has the suitable tune amplifying circuit of electric charge change-over circuit, filter circuit, output to put
The big part of circuit and voltage-stabilized power supply etc. five composition.Charge amplifier 11 has three kinds of basic functions：Enlarging function：
Small electric charge to the output of PVDF piezoelectric membranes is amplified, and is exported using the normal voltage of 0-5v；Adjust
Section function：According to the mechanical characteristic of different cereal, multiplication factor can adjust to adapt to difference between 4-1000
Sensitivity of the cereal to PVDF piezoelectric membrane impulsive forces；Filter function：Removal vibration noise, extracts cereal
Flow signal.
Fig. 9 is the hardware structure diagram of acquisition module.Acquisition module 12 with 32 embeded processors be core,
With data sampling and processing and transmittability, 0-5V voltage signals and CAN2.0 communication modes are supported.
Acquisition module 12 is made up of five parts, mainly there is minimum SCM system, power module, voltage analog
Amount modulate circuit, current-mode analog quantity modulate circuit, CAN drivers.
Single-chip minimum system is made up of singlechip chip, power-supply system and crystal oscillator etc., is that the computing of model is put down
Platform.The single-chip microcomputer inside selected in acquisition module carries the RAM and Flash for using enough, and with control
Device local area network (CAN) controller, analog/digital converter (ADC) can so simplify hardware design,
Improve the stability of hardware system.
The asynchronous DC-DC buck regulators of a pwm pattern of power module.Power module is provided
4.5V-29V wide-range input voltage, make itself and meanwhile can be applied to 12V and 24V application scenario.
Analog quantity modulate circuit can increase the input impedance of voltage signal, and the influence of sampling resistor is removed, and
Can play a part of to enter voltage signal row buffering, isolation.
It is connected in CAN as external communication interface using CAN communication in acquisition module.CAN
It is a kind of serial communication network for supporting real-time distributed control, data communication reliability is high, real-time,
Disclosure satisfy that demand of this measurement apparatus to communication.Because the single-chip microcomputer inside that acquisition module is selected carries CAN
Controller, so CAN communication interface module is mainly made up of CAN drivers, major function is by CAN
The logic level transition of controller is the differential level of CAN, and the isolation work(with DC 2500V
Energy.
The measuring method of cereal flow detection means, it is characterised in that comprise the following steps：
S1：Cereal flow detection means is arranged on harvester elevator exit, is spilled over intercepting cereal
Impulsive force afterwards；
S2：According to piezo-electric effect, electric charge can be produced in its plane of polarization after PVDF piezoelectric membrane stress, and lead to
Cross the extraction of needle-like metal terminal.
S3：The electric charge feeding charge amplifier treatment that PVDF piezoelectric membranes are exported, charge signal is through electric charge
With the voltage output of certain amplitude after the LPF of amplifier and conversion.
S4：Acquisition Circuit detects the output voltage signal of charge amplifier, then according to cereal flow and voltage
The relation of signal, calculates actual cereal flow.
Claims (7)
1. a kind of Combine Harvester Grain flow detector, it is characterised in that including：
Sensor assembly, is arranged at the exit of united reaper elevator, for cereal impulsive force to be changed
It is charge signal；
Signal acquisition process module, the charge signal for being detected according to sensor assembly calculates grain stream
Amount；
Stuck-module is installed, for the detection means to be fixed on into elevator exit.
2. detection means according to claim 1, it is characterised in that the sensor assembly includes
PVDF piezoelectric membranes, damping material and loading plate；
The PVDF piezoelectric membranes are pasted onto on damping material, for cereal impulsive force to be converted into electric charge letter
Number output；
The damping material is pasted onto between PVDF piezoelectric membranes and loading plate, for suppressing to vibrate；
The loading plate is pasted together with the damping material, is damping material and PVDF piezoelectric membranes
Immobilization carrier.
3. detection means according to claim 1, it is characterised in that the thickness of the damping material is
The effect that in the environment for being used suppression can vibrate reaches optimal thickness.
4. detection means according to claim 1, it is characterised in that the signal acquisition process module
Including charge amplifier and Acquisition Circuit；
Be amplified for electric charge and exported with normal voltage by the charge amplifier；
The Acquisition Circuit is core with 32 embeded processors, is exported for Real-time Collection charge amplifier
Voltage, converted treatment obtains grain stream value, and result is exported with digital communication mode.
5. detection means according to claim 1, it is characterised in that the installation stuck-module includes
Adjusting bracket and fixed mount；
Described adjusting bracket one end is connected with loading plate, and the other end is connected with fixed mount, for adjusting detection means
Setting height(from bottom) and angle；
Described fixed mount one end is fixed by bolt with tanker, and the other end and adjusting bracket are connected.
6. a kind of Combine Harvester Grain flow-measuring method, it is characterised in that comprise the following steps：
S1：Cereal flow detection means is arranged on harvester elevator exit, is spilled over intercepting cereal
Impulsive force afterwards；
S2：According to piezo-electric effect, electric charge can be produced in its plane of polarization after sensor assembly stress, and by pin
Shape metal terminal is drawn；
S3：Charge amplifier treatment in the electric charge feeding signal acquisition process module that sensor assembly is exported,
Charge signal is after the LPF of charge amplifier and conversion with the voltage output of certain amplitude；
S4：Acquisition Circuit in signal acquisition process module detects the output voltage signal of charge amplifier, so
Afterwards according to cereal flow and the relation of voltage signal, actual cereal flow is calculated.
7. measuring method according to claim 1, it is characterised in that described according to cereal flow and electricity
The relation of signal is pressed, actual cereal flow is calculated, specially：
Q=-0.01369v2+0.5661v-0.1147
Wherein, q is cereal flow, and v is voltage signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510917623.XA CN106856808A (en) | 2015-12-11 | 2015-12-11 | Combine Harvester Grain flow detector and measuring method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510917623.XA CN106856808A (en) | 2015-12-11 | 2015-12-11 | Combine Harvester Grain flow detector and measuring method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106856808A true CN106856808A (en) | 2017-06-20 |
Family
ID=59177219
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510917623.XA Pending CN106856808A (en) | 2015-12-11 | 2015-12-11 | Combine Harvester Grain flow detector and measuring method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106856808A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107509449A (en) * | 2017-08-11 | 2017-12-26 | 潍坊艾格瑞智能科技有限公司 | A kind of united reaper yield monitoring system |
| CN108811696A (en) * | 2018-06-21 | 2018-11-16 | 江苏大学 | A kind of Combine Harvester Grain quality stream measurement production device based on ultrasound suspending |
| CN115176582A (en) * | 2022-09-14 | 2022-10-14 | 陕西耕辰科技有限公司 | Grain flow measuring device, measuring method, conveying equipment and harvester |
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| CN205408586U (en) * | 2015-12-11 | 2016-08-03 | 中国科学院沈阳自动化研究所 | Combine cereal flow detection device |
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| US5686671A (en) * | 1995-09-11 | 1997-11-11 | Deere & Company | Grain mass flow sensor for an agricultural combine |
| GB2321112A (en) * | 1997-01-14 | 1998-07-15 | Ford New Holland Nv | Impeller for mass flow measurement |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107509449A (en) * | 2017-08-11 | 2017-12-26 | 潍坊艾格瑞智能科技有限公司 | A kind of united reaper yield monitoring system |
| CN108811696A (en) * | 2018-06-21 | 2018-11-16 | 江苏大学 | A kind of Combine Harvester Grain quality stream measurement production device based on ultrasound suspending |
| CN115176582A (en) * | 2022-09-14 | 2022-10-14 | 陕西耕辰科技有限公司 | Grain flow measuring device, measuring method, conveying equipment and harvester |
| CN115176582B (en) * | 2022-09-14 | 2022-11-22 | 陕西耕辰科技有限公司 | Grain flow measuring device, grain flow measuring method, conveying equipment and harvester |
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Application publication date: 20170620 |