CN106770504A - One kind floating ground formula grain moisture content on-line measuring device - Google Patents
One kind floating ground formula grain moisture content on-line measuring device Download PDFInfo
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Abstract
Based on contactless parallel plate electrode Floating capacitor measuring principle, a kind of floating ground formula grain moisture content on-line measuring device is invented, with reference to static batch mensuration, to improve the repeatable accuracy of measurement；Positioning charge device is devised, the error caused by accumulation mode difference causes voidage to change to measurement is eliminated.Using wireless communication technology, the real-time Data Transmission of sensor and computer client is realized, overcome the influence for drying scene bad working environments to data signal transmission, it is adaptable to the grain moisture content on-line real-time measuremen in drying machine drying process.Compared with the Oven Method of national regulations is measured, maximum deviation is less than ± 0.4% to on-line checking result.Using positioning charge, batch steady state measurement, wireless telecommunications ensure that the precision and reliability of on-line checking, to realize that Grain Drying Process Self Adaptive Control provides moisture content online measuring technique means.
Description
Technical field
The present invention relates to a kind of detection means, more particularly to a kind of floating ground formula grain moisture content on-line measuring device.
Background technology
Research of the water China in grain drying model analyzing theory and control technology field, disclose grain moisture content and combine energy and drying system heat energy structure, specify and realize energy-efficient technological approaches using the objective gesture that dries, develop grain drying adaptive control system, but reliable moisture on-line detection is still one of the difficult point for realizing technology application.Moisture is related to the physics and chemical property of grain, it is an important indicator for evaluating product quality, it is also to realize that drying process regulates and controls, one of essential key parameter of energy-saving technological design, but still lack the degree of accuracy high, good stability online moisture content detection device and technology at present.
Substantial amounts of trial has been carried out around the exploitation on-line detector such as microwave method, infrared method, electric method, pressure application.The common shortcoming of microwave, infrared and capacitance method is to be influenceed larger by the moisture distribution inside the shape of grain, thickness, density and plastochondria, accuracy of detection in dust atmosphere high and larger grain moisture fluctuation is relatively low, the maximum problem of NEUTRON METHOD measurement is that the scattering properties of hydrogen is unstable, neutron counting is more different because of the kind of grain than with the Changing Pattern of grain measure moisture content relation, and different times, the grain of different cultivars are also differed.Corresponding pretreatment work must be made to each batch materials when measuring grain moisture content using NEUTRON METHOD, technology is still immature.High-precision grain moisture content simple grain on-line detector is developed based on electric-resistivity method, but reliable on-line sampling problem annoyings the application of technology.There is many uncertain factors in grain drying system, high temperature, high humidity, dust high, fluidised form fluctuation, percentage of impurity change and all cause very big difficulty to accuracy of detection and reliability.For the specific technical problem of capacitive way on-line measurement, such as set up constant flow condition lower sensor concussion frequency, explore dielectric dissipation factor, improve electrode plate structure, Detection ＆ Controling have carried out systematic research, so far extremely lack as the example of robust techniques On-line Product application, accuracy of detection and reliability are very big by grain fluidised form influence of fluctuations.
The content of the invention
The invention aims to solve the problems, such as grain measurement of moisture content precision and reliability easily by grain fluidised form influence of fluctuations, a kind of floating ground formula grain moisture content on-line measuring device is devised.
The technical solution adopted for the present invention to solve the technical problems is：
Floating ground formula grain moisture content on-line measuring device is made up of parts such as capacitance sensor, positioning charge device, draining crop mechanism, capacitance measurement circuit, wireless communication networks.Positioning charge device is arranged near drying machine grain outlet, a part of grain of grain outlet can fall into and fill up positioning charge device, grain is at the uniform velocity stably sent into capacitance sensor by the discharge roller that positioning fills device, it is ensured that voidage of the grain under same moisture content is consistent in sensor.Capacitive approach switch is arranged at capacitance sensor top, after grain fills sensor, proximity switch records the capacitance and temperature value of tested grain and calculates corresponding moisture content to single-chip microcomputer (MCU) output signal, now MCU by electric capacity digital conversion circuit (CDC) and temperature digital change-over circuit (TDC).Measurement terminates rear MCU and starts row's grain electromagnet, the row's of opening grain side plate, and having surveyed grain discharge sensor, system is into measuring next time.Sensor measurement is sent to computer in real time by wireless module in measurement process, realizes user's remote monitoring.
Described capacitor sensor structure uses the contactless parallel plate electrode Floating capacitor mensuration of thin-slab structure, measurement process grain not to be contacted with pole plate, electrode can be avoided by electrochemical corrosion, while also improving the certainty of measurement of grain electric capacity under high-moisture.Screen layer isolation external electromagnetic field interference is wrapped up around measured zone.Capacitor plate is 1.6mm thickness double face coppers, and two pieces of polar plate areas are identical with shape, and pole plate medial surface is capacitive measurement electrodes, reverse side ground connection.The outer protection board of sensor and measurement cavity volume material are acrylic board.Two capacitor plates are arranged on measurement cavity volume outer surface, grain is tested in cavity volume and is insulated with capacitor plate.Capacitor plate ground plane pastes one layer of two-sided conductive aluminum foil to completely cut off the interference of external electromagnetic field; the area of screen layer is slightly larger than polar plate area; the part having more has equal potential belt; reducing install outer protection board outside edge effect sensor measurement cavity volume; protection capacitor plate and screen layer, realize functions of waterproof and dustproof.
Described positioning charge device is arranged on sensor cavity volume top, and motor drives the rotation of discharge roller that the cereal in aggregate bin is uniformly trickled down with line like manner, and by taking grain dry on-line checking corn as an example, its unrestrained average speed is about 15g/s.
Described draining crop mechanism is designed to lateral opening under static state, and spring has certain pretension, it is ensured that discharge door will not be pushed open by the lateral force of grain；During row's grain, electromagnet is powered, and promotes pivoted arm to overcome spring tension to open discharge door；Grain is cleared after 4 s, and electromagnet is automatically powered off, and discharge door resets under the resilience of spring.
Electric capacity when described measurement cavity volume is unloaded is 0.2pF, and when cavity volume fills grain, electric capacity is 5~35pF, and in order to obtain the moisture content data of degree of precision, measuring circuit resolution ratio need to be less than 0.1pF, and the precision is realized using traditional impedance method and the resonance method are difficult.Grain condenser type on-line checking Micro-capacitance measuring circuit is built using AD7745 and its expanded circuit jointly with single-chip microcomputer, the capacitive measurement scales of AD7745 are 0~21pF, using capacitance ratio method, capacitance detecting scope can be extended to 0~120pF.
Described cordless communication network is to ensure moisture on-line device with real-time, the accurate, stabilization that communicated between computer, avoid drying influence of the scene adverse circumstances to data communication, reduction equipment installation period and cost, devise the cordless communication network of suitable moisture on-line device herein.Sensor side uses JZ873 wireless data transmission modules, and the module is using transparent transmission mode by serial ports and chip microcontroller data transmit-receive；Computer end uses JZ874USB wireless data transmission modules.The transmission frequency of two intermodules is 433MHz, and baud rate is 9600bps, and using 3.5db sucker antennas, wireless transmission distance is no less than 2000m, meets the requirement of grain drying data transmission distance.Grain moisture content on-line measuring device communicates using ModbusASCII communication protocols with computer wireless.The agreement includes address code, and function code, data interval and LRC are verified, and can realize the communication of many equipment rooms.
Substantial amounts of vapor can be discharged in described grain drying equipment running.Phase mutual friction between grain in drying process, produces substantial amounts of dust in the presence of blower fan and elevator.Therefore with reference to GB4028-2008 pair sensor power supply, control circuit and executing agency make water proof and dust proof process, reach IP64CM ranks.Sensor is constantly washed away in detection process by grain, in the case of unprotected, will be by heavy wear in the sensor short time, it is therefore necessary to which it is the glass of 1mm to paste thickness in grain moisture content on-line measuring device outer surface and capacitance measurement cavity volume inwall.
The beneficial effects of the invention are as follows：
Using contactless parallel Floating capacitor method measurement grain electric capacity, grain is measured by batch, and measurement process grain is in stable state, therefore electric capacity has stability higher；Positioning charge device ensure that the uniformity of grain positioning filling, improve the accuracy and repeatability of sensor measurement；Using radio communication, realize and communicated between on-line measuring device and controller, it is to avoid the uncertain factor such as line loss is to detecting the influence of reliability；Using positioning charge, batch steady state measurement, wireless telecommunications ensure that the precision and reliability of on-line checking, in 15~50 DEG C of temperature, 80%~100%, under conditions of 14%~21% dynamic change, the maximum deviation of on-line checking is less than ± 0.4% to Moisture of Maize scope to relative humidity.
Brief description of the drawings
The present invention is further described with reference to the accompanying drawings and examples.
Fig. 1 is that system is constituted.
Fig. 2 is capacitance measurement circuit hardware principle.
Specific embodiment
As shown in figure 1, floating ground formula grain moisture content on-line measuring device is made up of parts such as capacitance sensor, positioning charge device, draining crop mechanism, capacitance measurement circuit, wireless communication networks.Positioning charge device is arranged near drying machine grain outlet, a part of grain of grain outlet can fall into and fill up positioning charge device, grain is at the uniform velocity stably sent into capacitance sensor by the discharge roller that positioning fills device, it is ensured that voidage of the grain under same moisture content is consistent in sensor.Capacitive approach switch is arranged at capacitance sensor top, after grain fills sensor, proximity switch records the capacitance and temperature value of tested grain and calculates corresponding moisture content to single-chip microcomputer (MCU) output signal, now MCU by electric capacity digital conversion circuit (CDC) and temperature digital change-over circuit (TDC).Measurement terminates rear MCU and starts row's grain electromagnet, the row's of opening grain side plate, and having surveyed grain discharge sensor, system is into measuring next time.Sensor measurement is sent to computer in real time by wireless module in measurement process, realizes user's remote monitoring.
After the determination of electric field form, the principal element of influence measurement electric capacity is the dielectric constant of tested grain, and dielectric constant is that tested grain molecule occurs the macro manifestations of polarization phenomena in the electric field.Assuming that uniformly filling grain in the measurement cavity volume of electric capacity, cavity volume internal electric field line is uniformly distributed, then the grain in capacitance measurement cavity volume can be considered as dry air, water, 3 kinds of mixtures of material of carbohydrate.Air and carbohydrate are low loss dielectric, and its dielectric constant with temperature is varied less, and 1 and 3~5 is respectively may be about under 50kHz frequencies；Water is lossy medium high, and its dielectric constant with temperature changes and changes, and under 50kHz frequencies, 0~100 DEG C of water dielectric constant is 55.88~78.9.Because the dielectric constant of water is much larger than other 2 kinds of materials, therefore the dielectric constant of tested grain is directly related with its moisture content, and moisture content is higher, and dielectric constant is bigger.In order to obtain uniform and stable measurement electric field and reduce edge effect, herein using the contactless parallel plate electrode Floating capacitor mensuration of thin-slab structure, measurement process grain is not contacted with pole plate, electrode can be avoided by electrochemical corrosion, while also improving the certainty of measurement of grain electric capacity under high-moisture.Screen layer isolation external electromagnetic field interference is wrapped up around measured zone.Fig. 2 show capacitance type foodstuffs detecting line sensor structure.Capacitor plate is 1.6mm thickness double face coppers, and two pieces of polar plate areas are identical with shape, and pole plate medial surface is capacitive measurement electrodes, reverse side ground connection.The outer protection board of sensor and measurement cavity volume material are acrylic board.Two capacitor plates are arranged on measurement cavity volume outer surface; grain is tested in cavity volume to be insulated with capacitor plate; capacitor plate ground plane pastes one layer of two-sided conductive aluminum foil to completely cut off the interference of external electromagnetic field; the area of screen layer is slightly larger than polar plate area; the part having more has equal potential belt, reduces edge effect, and outer protection board is installed outside sensor measurement cavity volume; protection capacitor plate and screen layer, realize functions of waterproof and dustproof.Level sensor is loaded on sensors topside, for detecting whether grain fills sensor cavity volume.Sensor downside is equipped with digital temperature sensor, for measuring cereal temperature, influence of the amendment temperature to capacitance measurement.
In addition to being influenceed by temperature and moisture content, its voidage piled up also significantly affects measurement electric capacity to grain electric capacity.When the grain of identical moisture content falls into measurement cavity volume by different way, the voidage of grain can also change in cavity volume, so as to influence measurement result.Because the voidage of bulk material is difficult to on-line measurement, it is therefore desirable to inquire into difference and fall into influence and its repeatability that mode piles up voidage to it.The representative grain of experiment 3 classes of setting falls into mode online, and the 1st class is unrestrained for fixed point, and the 2nd class is unrestrained for line style, and class is uniformly trickled down for whole cross section, wherein the unrestrained mode of fixed point devises 3 unrestrained positions, it is respectively 1~3；The unrestrained mode of line style devises 4 unrestrained positions, is respectively 4~7；Uniformly unrestrained mode is labeled as 8,3 kinds of unrestrained speed of every kind of unrestrained mode point, wherein the speed that falls into of the unrestrained mode of fixed point is respectively 5,10 and 20g/s；The speed that falls into of the unrestrained mode of line style is respectively 10,20 and 30g/s；The unrestrained speed of uniform unrestrained mode is respectively 25,35 and 50g/s.Corn sample moisture content is respectively 13.3%, 15.1% and 17.6%, and experiment every time is repeated 20 times.
Moisture content be 13.3% corn under 8 kinds of unrestrained modes, its measurement electric capacity change to 13.2pF from 8.8pF, unrestrained area is bigger, measurement electric capacity it is higher.Moisture content is that 15.1% and 17.6% corn also has identical characteristic, and unrestrained area is bigger, and influence of the Moisture of Maize change to measuring electric capacity is also more obvious.Therefore, mode is trickled down to have a significant impact measurement electric capacity.The different unrestrained final corn electric capacity for measuring of speed can be seen that under contrasting identical unrestrained mode, in the unrestrained velocity interval of experiment setting, trickle down velocity variations little to measurement capacitive effect.The different unrestrained final corn electric capacity for measuring in position can be obtained under by analyzing identical unrestrained mode, trickle down influence of the change in location to measuring electric capacity unobvious.It follows that unrestrained mode significantly affects measurement electric capacity, and the influence that the change of unrestrained position and unrestrained speed measures it electric capacity is little.Therefore, rationally control grain enters unrestrained mode when measuring cavity volume, is avoided that the unrestrained influence to certainty of measurement of random grain during on-line checking, for this designs the unrestrained positioning charge device of line style.Positioning charge device is arranged on sensor cavity volume top, and motor drives the rotation of discharge roller that the cereal in aggregate bin is uniformly trickled down with line like manner, and by taking grain dry on-line checking corn as an example, its unrestrained average speed is about 15g/s.
During on-line testing, to be stablized, accurate and high duplication electric capacity, grain in measurement cavity volume is gathered and measured with batch steady state way, measurement takes up about 800g grains to sensor every time, one-shot measurement total used time is about 1.5min, compared with the Grain Drying Process of 6~7 h, it is considered as measurement in real time, in the absence of measurement delay, after measurement terminates, clear surveyed grain rapidly, to ensure that every time new measurement grain will not be mutually mixed with grain has been surveyed, therefore, need to rationally design draining crop mechanism so that mechanism can efficiently, stabilization, reliability service.With the theory of similarity, measurement cavity volume can be with analogy into deep storehouse, the theoretical malleation understood suffered by grain bin bottom of Grain storehouse design and side pressure proposed from Janssen will not be linearly increasing with packed height, but with the increase of height, amplitude progressively slows down, after grain is highly reached necessarily, grain bin bottom pressure can tend to a saturation value, and in whole process, lateral pressure is much smaller than normal pressure.Based on above-mentioned principle, to ensure draining crop mechanism flexible movements, it is necessary to reduce the pressure of grain in measurement process to draining crop mechanism, therefore draining crop mechanism is designed to lateral opening.Under static state, spring has certain pretension, it is ensured that discharge door will not be pushed open by the lateral force of grain, during row's grain, electromagnet is powered, and promotes pivoted arm to overcome spring tension to open discharge door, grain is cleared after 4s, and electromagnet is automatically powered off, and discharge door resets under the resilience of spring.
As shown in Figure 2, electric capacity when measurement cavity volume is unloaded is 0.2pF, and when cavity volume fills grain, electric capacity is 5~35pF, in order to obtain the moisture content data of degree of precision, measuring circuit resolution ratio need to be less than 0.1pF, and the precision is realized using traditional impedance method and the resonance method are difficult.AD7745 electric capacity numeral conversion chip is just progressively used widely as a kind of micro- capacitive detection elements.The capacitive measurement scales of AD7745 are 0~21pF, using capacitance ratio method, capacitance detecting scope can be extended to 0~120pF.Grain condenser type on-line checking Micro-capacitance measuring circuit is built using AD7745 and its expanded circuit jointly with single-chip microcomputer herein.Measuring circuit controller uses enhanced 51 single-chip microcomputer STC12C5620AD, and external crystal-controlled oscillation is 22.1148MHz, with arithmetic speed and stability higher, IIC interface communications is passed through between single-chip microcomputer and AD7745.Circuit measuring principle uses floating ground method, to reduce sensor plate parasitic capacitance over the ground and electric leakage over the ground.Two capacitor plate leads use the screen layer of SYV-75-2-1 coaxial cables, cable to be connected and be grounded with sensor mask layer, further to eliminate the coupled capacitor between parasitic capacitance and lead.Measuring circuit performance detection refers to GB/T13978-2008 standard, with reference to space-variant electric capacity and with favour TH2821BLCR digital electric bridges, circuit is demarcated, calibration result shows that the resolution ratio of the circuit is 0.01pF, precision is ± 0.1pF, and measurable range is 0~85pF, meets measurement request.
Claims (7)
1. a kind of floating ground formula grain moisture content on-line measuring device, is made up of parts such as capacitance sensor, positioning charge device, draining crop mechanism, capacitance measurement circuit, wireless communication networks；Positioning charge device is arranged near drying machine grain outlet, a part of grain of grain outlet can fall into and fill up positioning charge device, grain is at the uniform velocity stably sent into capacitance sensor by the discharge roller that positioning fills device, it is ensured that voidage of the grain under same moisture content is consistent in sensor；Capacitive approach switch is arranged at capacitance sensor top, after grain fills sensor, proximity switch to single-chip microcomputer (MCU) output signal, now MCU by electric capacity digital conversion circuit (
CDC) and temperature digital change-over circuit (
TDC the capacitance and temperature value of tested grain) are recorded and corresponding moisture content is calculated；Measurement terminates rear MCU and starts row's grain electromagnet, the row's of opening grain side plate, and having surveyed grain discharge sensor, system is into measuring next time；Sensor measurement is sent to computer in real time by wireless module in measurement process, realizes user's remote monitoring.
2. formula grain moisture content on-line measuring device in floating ground according to claim 1, it is characterized in that contactless parallel plate electrode Floating capacitor mensuration of the described capacitor sensor structure using thin-slab structure, measurement process grain is not contacted with pole plate, electrode can be avoided by electrochemical corrosion, while also improving the certainty of measurement of grain electric capacity under high-moisture；Screen layer isolation external electromagnetic field interference is wrapped up around measured zone；Capacitor plate is 1.6mm thickness double face coppers, and two pieces of polar plate areas are identical with shape, and pole plate medial surface is capacitive measurement electrodes, reverse side ground connection；The outer protection board of sensor and measurement cavity volume material are acrylic board；Two capacitor plates are arranged on measurement cavity volume outer surface, grain is tested in cavity volume and is insulated with capacitor plate,；Capacitor plate ground plane pastes one layer of two-sided conductive aluminum foil to completely cut off the interference of external electromagnetic field; the area of screen layer is slightly larger than polar plate area; the part having more has equal potential belt; reducing install outer protection board outside edge effect sensor measurement cavity volume; protection capacitor plate and screen layer, realize functions of waterproof and dustproof.
3. formula grain moisture content on-line measuring device in floating ground according to claim 1, it is characterized in that described positioning charge device is arranged on sensor cavity volume top, motor drives the rotation of discharge roller that the cereal in aggregate bin is uniformly trickled down with line like manner, by taking grain dry on-line checking corn as an example, its unrestrained average speed is about 15g/s.
4. formula grain moisture content on-line measuring device in floating ground according to claim 1, it is characterized in that described draining crop mechanism is designed to lateral opening under static state, spring has certain pretension, it is ensured that discharge door will not be pushed open by the lateral force of grain；During row's grain, electromagnet is powered, and promotes pivoted arm to overcome spring tension to open discharge door；Grain is cleared after 4 s, and electromagnet is automatically powered off, and discharge door resets under the resilience of spring.
5. formula grain moisture content on-line measuring device in floating ground according to claim 1, it is characterized in that electric capacity when described measurement cavity volume is unloaded is 0.2pF, when cavity volume fills grain, electric capacity is 5~35pF, in order to obtain the moisture content data of degree of precision, measuring circuit resolution ratio need to be less than 0.1pF, and the precision is realized using traditional impedance method and the resonance method are difficult；Grain condenser type on-line checking Micro-capacitance measuring circuit is built using AD7745 and its expanded circuit jointly with single-chip microcomputer, the capacitive measurement scales of AD7745 are 0~21pF, using capacitance ratio method, capacitance detecting scope can be extended to 0~120pF.
6. formula grain moisture content on-line measuring device in floating ground according to claim 1, it is characterized in that described cordless communication network is to ensure moisture on-line device with real-time, the accurate, stabilization that communicated between computer, avoid drying influence of the scene adverse circumstances to data communication, reduction equipment installation period and cost, devise the cordless communication network of suitable moisture on-line device herein；Sensor side uses JZ873 wireless data transmission modules, and the module is using transparent transmission mode by serial ports and chip microcontroller data transmit-receive;Computer end uses JZ874USB wireless data transmission modules；The transmission frequency of two intermodules is 433MHz, and baud rate is 9600 bps, and using 3.5db sucker antennas, wireless transmission distance is no less than 2000m, meets the requirement of grain drying data transmission distance；Grain moisture content on-line measuring device communicates using ModbusASCII communication protocols with computer wireless；The agreement includes address code, and function code, data interval and LRC are verified, and can realize the communication of many equipment rooms.
7. formula grain moisture content on-line measuring device in floating ground according to claim 1, it is characterized in that substantial amounts of vapor can be discharged in described grain drying equipment running；Phase mutual friction between grain in drying process, produces substantial amounts of dust in the presence of blower fan and elevator；Therefore with reference to GB4028-2008 pair sensor power supply, control circuit and executing agency make water proof and dust proof process, reach IP64CM ranks；Sensor is constantly washed away in detection process by grain, in the case of unprotected, will be by heavy wear in the sensor short time, it is therefore necessary to which it is the glass of 1mm to paste thickness in grain moisture content on-line measuring device outer surface and capacitance measurement cavity volume inwall.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107478787A (en) * | 2017-09-05 | 2017-12-15 | 郑州鑫胜电子科技有限公司 | A kind of automatic assay device for being used to receive grain system |
| CN110112840A (en) * | 2019-06-14 | 2019-08-09 | 青岛大学 | A kind of wireless power transmission magnetic coupler constituted based on composite shielding layer |
| CN112232188A (en) * | 2020-10-14 | 2021-01-15 | 吴琼 | Real-time grain storage monitoring device and method |
| CN112345559A (en) * | 2019-08-06 | 2021-02-09 | 中国农业机械化科学研究院 | Online grain moisture detection device and detection method of combine harvester |
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2015
- 2015-11-25 CN CN201510834510.3A patent/CN106770504A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107478787A (en) * | 2017-09-05 | 2017-12-15 | 郑州鑫胜电子科技有限公司 | A kind of automatic assay device for being used to receive grain system |
| CN107478787B (en) * | 2017-09-05 | 2023-07-11 | 郑州鑫胜电子科技有限公司 | Automatic testing device for grain collecting system |
| CN110112840A (en) * | 2019-06-14 | 2019-08-09 | 青岛大学 | A kind of wireless power transmission magnetic coupler constituted based on composite shielding layer |
| CN110112840B (en) * | 2019-06-14 | 2023-10-03 | 青岛大学 | Wireless power transmission magnetic coupler based on composite shielding layer |
| CN112345559A (en) * | 2019-08-06 | 2021-02-09 | 中国农业机械化科学研究院 | Online grain moisture detection device and detection method of combine harvester |
| CN112232188A (en) * | 2020-10-14 | 2021-01-15 | 吴琼 | Real-time grain storage monitoring device and method |
| CN112232188B (en) * | 2020-10-14 | 2024-03-08 | 新疆乾坤信息技术有限公司 | Real-time monitoring device and method for grain storage in granary |
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Application publication date: 20170531 |