CN104713910A - Resistive grain moisture measurement system - Google Patents
Resistive grain moisture measurement system Download PDFInfo
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- CN104713910A CN104713910A CN201510085621.9A CN201510085621A CN104713910A CN 104713910 A CN104713910 A CN 104713910A CN 201510085621 A CN201510085621 A CN 201510085621A CN 104713910 A CN104713910 A CN 104713910A
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Abstract
The invention discloses a resistive grain moisture measurement system. A moisture measurement method provided by the invention can perform grain moisture measurement continuously in a real-time manner and upload the grain moisture value and the temperature value of the grain environment in a real-time manner, and can also generate alarm information to remind users and automatically realize shutdown in time to avoid loss, so that the drying efficiency is improved by 12 to 15%. According to the method, the moisture measurement range can reach up to 11to 40%, and the temperature measurement range can reach up to minus 40 to 180 DEG C. According to the invention, the measured resistance signals are converted into frequency signals, and the grain moisture is measured by adopting a frequency measuring and period measuring method; an oscillating circuit is used to convert the collected signals, the measurement is performed by a single-chip microcomputer, linearization is carried out through a software optimization design and an appropriate algorithm, so that the moisture measurement can be performed quickly and accurately on samples of various types of food grains.
Description
Technical field
The present invention relates to water content detection field, particularly relate to a kind of grain moisture detection field.
Technical background
Grain measurement of moisture content to the purchase of grain, transport, storage, processing trade all tool be of great significance.The too high waste transport power of moisture and capacity, impel grain vital movement vigorous, easily causes to come that grain generates heat, goes mouldy, infested and other Biochemical changes.And grain moisture content is too low, decrease grain weight, can grain quality be affected.Therefore, moisture is an important quality standard of grain always.
The water content detection technology of grain is divided into direct method and indirect method generally.Direct method is the moisture directly removed by dry or chemical method in grain, detects the absolute water content of sample.It is high that direct method detects moisture, accuracy of detection, is applicable to test in laboratory, and shortcoming is that the time detected is long, cannot realize fast, on-line monitoring, thus be difficult to meet the requirement of modern production to speed and serialization.Indirect method is by detecting the physical quantity relevant with moisture, mainly comprising resistance determination of moisture, nuclear magnetic resonance method, electric capacity determination of moisture, infrared type determination of moisture.
Traditional grain moisture content on-line measuring device mainly utilizes indirect method as resistance determination of moisture, electric capacity determination of moisture etc., simultaneously in conjunction with anti-block apparatus, signal transmitting device sensor unit, with formations such as frequency/voltage change-over circuit, multiple signals change-over circuit, multichannel gain adjusting circuit, main frame, printer, signal cables, tentatively achieve online, real-time, synchronous, the multiple spot water content detection in grain heat-drying process.
By analysis, traditional grain moisture content detection device can only be simple measurement and display, not forming real-time, the on-line control system supporting with grain drying device, cannot be the automatic control realized in Grain Drying Process, reduce drying efficiency, cause energy dissipation.
Summary of the invention
For solving the problems of the technologies described above, overcome the deficiencies in the prior art, the invention provides a kind of real-time, the on-line control system that match with drying plant, this control is based on resistance moisture detecting method, Orthogonal Least Square is utilized to set up RBF neural learning algorithm, use its Nonlinear Processing ability to merge measurement data, automatically can carry out various correction and error compensation to measured value, thus improve reliability and the measuring accuracy of grain moisture content detection system.
For realizing object of the present invention, one aspect of the present invention provides a kind of grain moisture detection method, comprising:
According to the moisture measurement request from user, cereal contained humidity to be measured and cereal place to be measured environment temperature are detected;
Data Fusion is carried out to the temperature data of the moisture data contained by detected cereal to be measured and cereal place to be measured environment, obtains the actual moisture data of cereal to be measured;
The actual moisture data of obtained cereal to be measured are sent to display device, check for user.
Wherein, described the step that cereal contained humidity to be measured and cereal place to be measured environment temperature detect to be comprised:
Utilize the moisture transducer being arranged on two of Moisture Meter and being used for rolling between the rolling wheel of cereal to be measured, the moisture data contained by Real-time Collection cereal to be measured;
Utilize the temperature sensor be arranged in drying plant, the temperature data of Real-time Collection cereal place to be measured environment.
Utilize the gravity sensor be arranged on rolling wheel, Real-time Collection cereal falls into the weight signal of rolling wheel, along with increasing of cereal grain number, obtains the actual grain number of cereal.
Particularly, carry out fusion treatment to cereal contained humidity to be measured and cereal place to be measured environment temperature to comprise:
If detected temperatures is higher than desired temperature, then the multiple of 0.101 of the difference of the moisture value detected and actual temperature and design temperature can be done difference, obtain the actual moisture value after temperature compensation, that is:
M
actual=M
initially-0.101* (T
actual-T
setting)
Wherein, M
actualrefer to the actual moisture value after temperature compensation, M
initiallyrefer to the moisture value detected, T
actualdetected temperatures value, T
settingit is the temperature value that user sets.
If detected temperatures is lower than desired temperature, then 0.101 multiple of the difference of the moisture value detected and design temperature and actual temperature can be done and, obtain the actual moisture value after temperature compensation, that is:
M
actual=M
initially+ 0.101* (T
setting-T
actual)
Wherein, M
actualrefer to the actual moisture value after temperature compensation, M
initiallyrefer to the moisture value detected, T
actualdetected temperatures value, T
settingit is the temperature value that user sets.
Particularly, described detection cereal contained humidity to be measured and cereal place to be measured environment temperature is undertaken by grain moisture detecting unit, comprising:
For detecting the moisture transducer of cereal contained humidity to be measured, with for detecting the temperature sensor of cereal place to be measured environment temperature;
The temperature data recorded for the moisture data that recorded by described moisture transducer and described temperature sensor carries out collection and simply dealt single chip processing module;
Data for collecting described in carrying out carry out the RBF data fusion module of data fusion; And,
For controlling described water content detection unit, and the data after described process are carried out transmission process, for the communication module of the PLC control unit that user checks.
For realizing object of the present invention, the present invention provides a kind of grain-drying control method on the other hand, comprising:
During grain dry to be measured, utilize above-mentioned grain moisture measuring method, obtain the actual moisture data of cereal to be measured;
Described actual moisture data and pre-set moisture data are compared;
When described actual moisture data are greater than pre-set moisture data, according to the difference of described actual moisture data and pre-set moisture data, adjustment exports the working power frequency of the drying plant for drying cereal to be measured to, to carry out frequency control;
Repeat above-mentioned steps, until described actual moisture data are less than or equal to pre-set moisture data.
Particularly, a kind of grain-drying control method provided by the invention also comprises:
By the previous actual moisture data of cereal to be measured and the difference of these actual moisture data divided by these actual moisture data, obtain moisture difference ratio;
Described moisture difference ratio and estimated rate are compared;
If described moisture difference ratio is greater than estimated rate, then generate warning information, thus timely reminding user.
Further aspect of the present invention provides a kind of resistor type cereal MOISTURE MEASUREMENT SYSTEM, it is characterized in that, comprising:
For gathering the data acquisition module of the temperature information of environment residing for grain moisture information to be measured and cereal to be measured;
The data obtained by described data acquisition module are carried out feature extraction and are carried out the data fusion module of RBF fusion calculation;
The analysis result obtained through described data fusion module is uploaded to the communication module of plc data control center; And,
For connecting the circuit of described moisture transducer and temperature sensor, data acquisition module and control module.
Wherein, described data acquisition module comprises:
Grain moisture information to be measured is exported the moisture transducer for voltage signal;
Temperature information for environment residing for cereal to be measured exports the temperature sensor for voltage signal; And
For gathering described voltage signal and carrying out A/D conversion and integrate the data pre-processing unit processed.
Particularly, described data acquisition module also comprises:
Signal after described data pre-processing unit process is carried out the data processing unit of interference and noise-filtering.
Particularly, described Moisture sensing devices is the crushing formula electrode with fixation pressure.
Wherein, described temperature sensor is arranged in the cereal storage silo in dryer, for detecting the temperature of cereal to be measured in real time.
Particularly, described data acquisition module adopt single-chip microcomputer and A D chip as front end data acquisition system, carry out data acquisition, then computing machine is given by Can Link communication by data, last under Lab VIEW development platform, various process, analysis, storage, display, printing are carried out to data.
Particularly, described acquisition control circuit mainly contains C51 single-chip microcomputer, MAX125 and interface circuit composition.
Especially, a kind of resistor type cereal MOISTURE MEASUREMENT SYSTEM provided by the invention also comprises the power supply for starting MOISTURE MEASUREMENT SYSTEM.
Particularly, described power supply carries out step-down process by transformer, and through the filtering circuit process that the rectification circuit that is made up of four commutation diodes and an electric capacity form, obtaining can for the direct current of system;
Wherein, described commutation diode selects SIAB type diode, and described filter capacitor selects the alminium electrolytic condenser of 25V/47uF.
Beneficial effect of the present invention embodies in the following areas:
1, the present invention adopts and the resistance signal of measurement is converted into frequency signal, grain moisture content is measured by the method for frequency measurement and cycle measurement, with oscillating circuit, collection signal is changed, and measured by single-chip microcomputer, to be designed by software optimization and suitable algorithm carries out linearization, moisture measurement can carried out to test portions such as all kinds of foodstuff grains fast and accurately.
2, the present invention adopts bridge amplification circuit to carry out temperature compensation, adopts thermistor as an arm on bridge road, and is parallel with resistance R at thermistor two ends, improve the temperature linearity characteristic of thermistor; And by the manual adjustments of Function Fitting and error, the error limitation that the factors such as environment temperature, the grain degree of packing can be caused, among a small circle, improves the precision of moisture measurement, achieves high efficiency and the precision of moisture measurement.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of grain moisture measuring method of the present invention;
Fig. 2 is the process flow diagram of grain-drying control method of the present invention;
Fig. 3 is the comprising modules schematic diagram of a kind of resistor type cereal MOISTURE MEASUREMENT SYSTEM provided by the invention.
Embodiment
The present invention is further described below in conjunction with specific embodiments and the drawings.
The process flow diagram of grain moisture measuring method of the present invention as shown in Figure 1, comprises the following steps:
S101, according to the moisture measurement request from user, detects cereal contained humidity to be measured and cereal place to be measured environment temperature;
The temperature data of S102 to the moisture data contained by detected cereal to be measured and cereal place to be measured environment carries out Data Fusion, obtains the actual moisture data of cereal to be measured;
The actual moisture data of obtained cereal to be measured are sent to display device by S103, check for user.
Further, describedly detection carried out to cereal contained humidity to be measured and cereal place to be measured environment temperature comprise:
Utilize the moisture transducer being arranged on two of Moisture Meter and being used for rolling between the rolling wheel of cereal to be measured, the moisture data contained by Real-time Collection cereal to be measured, wherein, moisture transducer is the crushing formula electrode with fixation pressure;
Utilizing the temperature sensor that is arranged in drying plant, the temperature data of Real-time Collection cereal place to be measured environment, being conducive on the one hand knowing the environment temperature by drying cereal, on the other hand, can according to the Software for Design recording grain temperature and carry out temperature compensation;
Utilize the gravity sensor be arranged on rolling wheel, Real-time Collection cereal falls into the weight signal of rolling wheel, along with increasing of cereal grain number, obtains the actual grain number of cereal.
Particularly, the present invention adopts bridge amplification circuit to carry out temperature compensation, using thermistor as an arm on bridge road, is parallel with resistance at the two ends of thermistor, can improve the temperature linearity characteristic of thermistor, and uses zero-regulator resistor to carry out the adjustment of probe temperature.
Further, describedly fusion treatment carried out to cereal contained humidity to be measured and cereal place to be measured environment temperature comprise:
If detected temperatures is higher than desired temperature, then the multiple of 0.101 of the difference of the moisture value detected and actual temperature and design temperature can be done difference, obtain the actual moisture value after temperature compensation, that is:
M
actual=M
initially-0.101* (T
actual-T
setting)
Wherein, M
actualrefer to the actual moisture value after temperature compensation, M
initiallyrefer to the moisture value detected, T
actualdetected temperatures value, T
settingit is the temperature value that user sets.
If detected temperatures is lower than desired temperature, then 0.101 multiple of the difference of the moisture value detected and design temperature and actual temperature can be done and, obtain the actual moisture value after temperature compensation, that is:
M
actual=M
initially+ 0.101* (T
setting-T
actual)
Wherein, M
actualrefer to the actual moisture value after temperature compensation, M
initiallyrefer to the moisture value detected, T
actualdetected temperatures value, T
settingit is the temperature value that user sets.
The present invention is based on the relation research of grain moisture content and resistance, find different grain moisture contents, its resistance is not identical yet, grain moisture content is larger, and its resistance value is less, otherwise, grain moisture content is less, its resistance value is larger, and therefore, the present invention determines the moisture value of grain by the resistance value measuring grain.
In addition, pass through experimental study, the relation of resistance and moisture is subject to the impact of temperature, under the condition of normal temperature-10 ~ 40 DEG C, temperature often raises 1 DEG C and is equivalent to its moisture increase by 0.1% to the impact of resistance value, i.e. 0.1% (humidity)/DEG C, therefore the present invention adopts temperature compensation process to realize accurately measuring of moisture.
Further, described detection cereal contained humidity to be measured and cereal place to be measured environment temperature is undertaken by grain moisture detecting unit, comprising:
For detecting the moisture transducer of cereal contained humidity to be measured, with for detecting the temperature sensor of cereal place to be measured environment temperature;
The temperature data recorded for the moisture data that recorded by described moisture transducer and described temperature sensor carries out collection and simply dealt single chip processing module;
Data for collecting described in carrying out carry out the RBF data fusion module of data fusion; And,
For controlling described water content detection unit, and the data after described process are carried out transmission process, for the communication module of the PLC control unit that user checks.
The process flow diagram of grain-drying control method of the present invention as shown in Figure 2, comprises the following steps:
S201, during grain dry to be measured, utilizes the grain moisture measuring method described in step S101 ~ S103, obtains the actual moisture data of cereal to be measured;
Described actual moisture data and pre-set moisture data compare by S202;
S203 is when described actual moisture data are greater than pre-set moisture data, and according to the difference of described actual moisture data and pre-set moisture data, adjustment exports the working power frequency of the drying plant for drying cereal to be measured to, to carry out frequency control;
Repeat above-mentioned steps, until described actual moisture data are less than or equal to pre-set moisture data.
Further, the process flow diagram of described grain-drying control method of the present invention also comprises:
By the previous actual moisture data of cereal to be measured and the difference of these actual moisture data divided by these actual moisture data, obtain moisture difference ratio;
Described moisture difference ratio and estimated rate are compared;
If described moisture difference ratio is greater than estimated rate, then generate warning information, thus timely reminding user.
The comprising modules schematic diagram of native system as shown in Figure 3, comprises the data acquisition module 1 of the temperature information for gathering environment residing for grain moisture information to be measured and cereal to be measured; The data obtained by described data acquisition module are carried out feature extraction and are carried out the data fusion module 2 of RBF fusion calculation; The analysis result obtained through described data fusion module is uploaded to the communication module 3 of plc data control center; And, for connecting the circuit (not shown) of described moisture transducer and temperature sensor, data acquisition module and control module.
Wherein said data acquisition module comprises: grain moisture information to be measured is exported the moisture transducer 12 for voltage signal; Temperature information for environment residing for cereal to be measured exports the temperature sensor 11 for voltage signal; For gathering described voltage signal and carrying out A/D conversion and integrate the data pre-processing unit 13 processed; And the signal after described data pre-processing unit process is carried out the data processing unit 14 of interference and noise-filtering.
Wherein, described data acquisition module adopt single-chip microcomputer and A D chip as front end data acquisition system, carry out data acquisition, then computing machine is given by Can Link communication by data, last under Lab VIEW development platform, various process, analysis, storage, display, printing are carried out to data; Described acquisition control circuit mainly contains C51 single-chip microcomputer, MAX125 and interface circuit composition.
Further, the resistor type cereal MOISTURE MEASUREMENT SYSTEM of the application, also comprise the power supply for starting MOISTURE MEASUREMENT SYSTEM, described power supply carries out step-down process by transformer, and through the filtering circuit process that the rectification circuit that is made up of 4 commutation diodes and an electric capacity form, obtaining can for the direct current of system;
Wherein, described commutation diode selects SIAB type diode, and described filter capacitor selects the alminium electrolytic condenser of 25V/47uF.
Feature of the present invention is: adopt and the resistance signal of measurement is converted into frequency signal, grain moisture content is measured by the method for frequency measurement and cycle measurement, with oscillating circuit, collection signal is changed, and measured by single-chip microcomputer, to be designed by software optimization and suitable algorithm carries out linearization, moisture measurement can carried out to test portions such as all kinds of foodstuff grains fast and accurately.
Another feature of the present invention is: adopt bridge amplification circuit to carry out temperature compensation, adopts thermistor as an arm on bridge road, and is parallel with resistance R at thermistor two ends, improve the temperature linearity characteristic of thermistor; And by the manual adjustments of Function Fitting and error, the error limitation that the factors such as environment temperature, the grain degree of packing can be caused, among a small circle, improves the precision of moisture measurement, achieves high efficiency and the precision of moisture measurement.
Of the present inventionly to be a feature: moisture detecting method of the present invention can be measured the grain moisture of real-time continuous; and upload the temperature value of environment residing for grain moisture value and cereal in real time; also can produce warning message reminding user; and automatically realize shutting down in time; avoid loss; and improving drying efficiency, the determination of moisture scope of the inventive method can reach 11% ~ 40%, and temperature measuring scope can reach-40 ~ 180 DEG C.
Although above-mentioned to invention has been detailed description; but be not limited thereto; those skilled in the art can principle according to the present invention modify, and therefore, all various amendments carried out according to principle of the present invention all should be understood to fall into protection scope of the present invention.
Claims (10)
1. a resistor type cereal MOISTURE MEASUREMENT SYSTEM, is characterized in that, comprising:
According to the moisture measurement request from user, cereal contained humidity to be measured and cereal place to be measured environment temperature are detected;
Data Fusion is carried out to the temperature data of the moisture data contained by detected cereal to be measured and cereal place to be measured environment, obtains the actual moisture data of cereal to be measured;
The actual moisture data of obtained cereal to be measured are sent to display device, check for user.
2. method according to claim 1, is characterized in that, describedly comprises the step that cereal contained humidity to be measured and cereal place to be measured environment temperature detect:
Utilize the moisture transducer being arranged on two of Moisture Meter and being used for rolling between the rolling wheel of cereal to be measured, the moisture data contained by Real-time Collection cereal to be measured;
Utilize the temperature sensor be arranged in drying plant, the temperature data of Real-time Collection cereal place to be measured environment.
3. method according to claim 2, is characterized in that, describedly also comprises the step that cereal contained humidity to be measured and cereal place to be measured environment temperature detect:
Utilize the gravity sensor be arranged on rolling wheel, Real-time Collection cereal falls into the weight signal of rolling wheel, along with increasing of cereal grain number, obtains the actual grain number of cereal.
4. method according to claim 1, is characterized in that, carries out fusion treatment comprise cereal contained humidity to be measured and cereal place to be measured environment temperature:
If detected temperatures is higher than desired temperature, then the multiple of 0.101 of the difference of the moisture value detected and actual temperature and design temperature can be done difference, obtain the actual moisture value after temperature compensation, that is:
M
actual=M
initially-0.101* (T
actual-T
setting)
Wherein, M
actualrefer to the actual moisture value after temperature compensation, M
initiallyrefer to the moisture value detected, T
actualdetected temperatures value, T
settingit is the temperature value that user sets;
If detected temperatures is lower than desired temperature, then 0.101 multiple of the difference of the moisture value detected and design temperature and actual temperature can be done and, obtain the actual moisture value after temperature compensation, that is:
M
actual=M
initially+ 0.101* (T
setting-T
actual)
Wherein, M
actualrefer to the actual moisture value after temperature compensation, M
initiallyrefer to the moisture value detected, T
actualdetected temperatures value, T
settingit is the temperature value that user sets.
5. any one method as described in claim 1-3, is characterized in that, described detection cereal contained humidity to be measured and cereal place to be measured environment temperature is undertaken by grain moisture detecting unit, comprising:
For detecting the moisture transducer of cereal contained humidity to be measured, with for detecting the temperature sensor of cereal place to be measured environment temperature;
The temperature data recorded for the moisture data that recorded by described moisture transducer and described temperature sensor carries out collection and simply dealt single chip processing module;
Data for collecting described in carrying out carry out the RBF data fusion module of data fusion; And,
For controlling described water content detection unit, and the data after described process are carried out transmission process, for the communication module of the PLC control unit that user checks.
6. a grain-drying control method, is characterized in that, comprising:
During grain dry to be measured, utilize the grain moisture measuring method described in any one of claim 1-3, obtain the actual moisture data of cereal to be measured;
Described actual moisture data and pre-set moisture data are compared;
When described actual moisture data are greater than pre-set moisture data, according to the difference of described actual moisture data and pre-set moisture data, adjustment exports the working power frequency of the drying plant for drying cereal to be measured to, to carry out frequency control;
Repeat above-mentioned steps, until described actual moisture data are less than or equal to pre-set moisture data.
7. method according to claim 5, is characterized in that, also comprises:
By the previous actual moisture data of cereal to be measured and the difference of these actual moisture data divided by these actual moisture data, obtain moisture difference ratio;
Described moisture difference ratio and estimated rate are compared;
If described moisture difference ratio is greater than estimated rate, then generate warning information, thus timely reminding user.
8. a resistor type cereal MOISTURE MEASUREMENT SYSTEM, is characterized in that, comprising:
For gathering the data acquisition module of the temperature information of environment residing for grain moisture information to be measured and cereal to be measured;
The data obtained by described data acquisition module are carried out feature extraction and are carried out the data fusion module of RBF fusion calculation;
The analysis result obtained through described data fusion module is uploaded to the communication module of plc data control center; And,
For connecting the circuit of described moisture transducer and temperature sensor, data acquisition module and control module.
9. resistor type cereal MOISTURE MEASUREMENT SYSTEM as claimed in claim 8, it is characterized in that, described data acquisition module comprises:
Grain moisture information to be measured is exported the moisture transducer for voltage signal;
Temperature information for environment residing for cereal to be measured exports the temperature sensor for voltage signal; And
For gathering described voltage signal and carrying out A/D conversion and integrate the data pre-processing unit processed.
10. resistor type cereal MOISTURE MEASUREMENT SYSTEM as claimed in claim 9, it is characterized in that, described data acquisition module also comprises:
Signal after described data pre-processing unit process is carried out the data processing unit of interference and noise-filtering.
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| CN106198885B (en) * | 2016-08-10 | 2019-04-30 | 江苏大学 | A kind of Combine Harvester Grain water content on-line testing device and method |
| CN108256134A (en) * | 2016-12-29 | 2018-07-06 | 航天信息股份有限公司 | A kind of method and device for selecting grain location mode |
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| CN107389746A (en) * | 2017-06-21 | 2017-11-24 | 国家粮食局科学研究院 | Grain heap moisture content online test method and system |
| CN107389746B (en) * | 2017-06-21 | 2020-05-19 | 国家粮食和物资储备局科学研究院 | Grain pile moisture content on-line detection method and system |
| CN108469454A (en) * | 2018-06-21 | 2018-08-31 | 安徽中科智能感知大数据产业技术研究院有限责任公司 | A kind of Internet of Things grain moisture detector and its detection method |
| CN108535331A (en) * | 2018-06-21 | 2018-09-14 | 安徽中科智能感知大数据产业技术研究院有限责任公司 | A kind of airborne grain moisture detector based on Internet of Things |
| CN109342671A (en) * | 2018-12-05 | 2019-02-15 | 武汉凯特复兴科技有限责任公司 | A kind of simple grain formula Grain Moisture Analyzer |
| CN110568134A (en) * | 2019-09-09 | 2019-12-13 | 深圳冠亚水分仪科技有限公司 | Moisture meter sensor and working method |
| CN115343336A (en) * | 2022-07-18 | 2022-11-15 | 佛冈明阳机械有限公司 | Method and device for measuring moisture of grains, moisture meter and storage medium |
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