CN104713918A - Cereal moisture detection method - Google Patents
Cereal moisture detection method Download PDFInfo
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- CN104713918A CN104713918A CN201510085622.3A CN201510085622A CN104713918A CN 104713918 A CN104713918 A CN 104713918A CN 201510085622 A CN201510085622 A CN 201510085622A CN 104713918 A CN104713918 A CN 104713918A
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Abstract
The invention discloses a cereal moisture detection method which mainly comprises the following steps: performing moisture detection by using a capacitance method, including selecting cereal samples from cereals to be detected, measuring capacitance corresponding to different moisture contents in the cereal samples, and obtaining NURBS cubic curves of the moisture of the samples and the voltage; drying the cereals to be detected, feeding into a moisture detection system, passing through a moisture sensor, and performing D/A conversion, thereby obtaining voltage signals of moisture; transmitting the acquired voltage signals to a data acquisition controller, calculating, and comparing with the NURBS cubic curves so as to obtain control parameters of a drying machine, and transmitting control instructions from a computer so as to control the drying process. By optimizing a capacitance sensor, data can be measured and fused by using a comprehensive fitting algorithm, the detection process can be dynamically monitored by using an embedded type system structure and a real-time operation system, information networking transmission processing, storage, calling, checking, issuing and management on various types information can be achieved, real-time information, temperature information, humidity information, alarm information and the like can be analyzed, scientific basis can be provided for detection reliability, and the management cost can be lowered.
Description
Technical field
The present invention relates to water content detection field, particularly relate to grain measurement of moisture content method.
Background technology
In grain moisture number be the important indicator detecting grain quality quality, excess moisture in grain, is unfavorable for the long-term preservation of grain, and grain is apt to deteriorate to addle; Moisture very few in grain, the nutriment disappearance of grain, then the quality of grain can not be guaranteed.As can be seen here, in grain, the number of moisture decides the quality of grain quality to a great extent.Thus, the detection of contained humidity in grain is just seemed particularly necessary.
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.Direct method detects moisture, and accuracy of detection is high, is applicable to test in laboratory, and shortcoming is that the time detected is longer, cannot realize fast, on-line checkingi, thus is 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 etc.
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, the measurement that traditional grain moisture content detection device can only be simple and display, do not form real-time, the on-line control system supporting with grain drying device, cannot realize the automatic control in Grain Drying Process, reduces drying efficiency, cause energy dissipation.
Summary of the invention
Object of the present invention is exactly to overcome above-mentioned prior art Problems existing, a kind of efficient grain MOISTURE MEASUREMENT SYSTEM is provided, it is on the basis of capacitance determining method, utilize NURBS Cubic Curve Fitting method, its Nonlinear Processing ability is used to merge measurement data, automatically various correction and error compensation can be carried out to measured value, thus improve reliability and the measuring accuracy of grain moisture content detection system, simultaneously independent research is based on PLC and the supporting real-time control system of grain drying device, achieve the automatic control in Grain Drying Process, Real time displaying, fault alarm and grain measurement of moisture content function.
For realizing object of the present invention, the control method of a kind of grain heat-drying provided of the present invention, comprising:
From grain to be measured, choose grain samples, measure the capacitance that in grain samples, different in moisture is corresponding, by obtaining the NURBS cubic curve of sample moisture and voltage;
After grain heat-drying to be measured, send in MOISTURE MEASUREMENT SYSTEM, by moisture transducer and D/A conversion, obtain the voltage signal of moisture;
The voltage signal of acquisition is sent to data acquisition controller, as calculated, compares with described NURBS cubic curve and process, obtain the controling parameters of dryer, by the instruction of computing machine issuing control, drying course is controlled.
The control method of a kind of grain heat-drying provided of the present invention, also comprises:
After the target water score value first setting grain and temperature value, then the grain to be measured after drying is sent in MOISTURE MEASUREMENT SYSTEM, detect.
Wherein, the described voltage signal by acquisition is sent to data acquisition controller, as calculated, compares process with NURBS cubic curve, and the controling parameters obtaining dryer comprises:
Judge whether voltage signal is less than the target water score value of grain, if be less than the target water score value of grain, then system can proceed the water content detection of twice automatically; If be more than or equal to the target water score value of grain, then grain can proceed drying and processing.
Particularly, described enter MOISTURE MEASUREMENT SYSTEM after also comprise:
By temperature sensor and D/A conversion, obtain the voltage signal of temperature.
Particularly, described moisture transducer is capacitance type sensor.
Especially, described capacitance type sensor is that material is made with red copper, and its outside surface is provided with metallic shield.
Particularly, described capacitance type sensor is by multiple plate condenser.
Wherein, data acquisition controller adopts single-chip microcomputer and A/D chip as front end data acquisition system, carries out data and gathers, and by Can Link communication, data are sent to computing machine, under Lab VIEW development platform, data are processed, analyze and stores.
Particularly, described MOISTURE MEASUREMENT SYSTEM employs two monostable multi resonant oscillating circuit, counteracts unloaded electric capacity.
The present invention provides a kind of capacitance type foodstuffs MOISTURE MEASUREMENT SYSTEM on the other hand, it is characterized in that, comprising:
For grain moisture content value being exported the capacitive transducer for capacitance signal;
Described capacitance signal is carried out gather, treatment and analyses, display data acquisition module;
The analysis result obtained through data acquisition module is outputted to computing machine, and the control module of issuing control order;
For connecting the circuit of described capacitive transducer, data acquisition module and control module.
Particularly, the power supply for starting MOISTURE MEASUREMENT SYSTEM is also comprised.
Especially, 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.
Wherein, described capacitive transducer comprises:
Multiple parallel longitudinal electric capacity being arranged in same flat board gathers dynamo-sheet, forms multiple groove structure for victualling;
By erection bolt, described electric capacity is gathered the main supporting plate that dynamo-sheet is fixed on an end face; And,
Be fixedly mounted on the control panel box of another end face of main supporting plate.
Particularly, described capacitive transducer periphery is provided with metallic shield, and double layer screen line is arranged on described metallic shield cover inner surface, makes circuit and sensor be positioned at described metallic shield, decreases stray capacitance and external interference.
Particularly, described multiple parallel longitudinal electric capacity being arranged in same flat board gathers dynamo-sheet, and the top forming multiple groove structure for victualling is provided with insulation barrier, reduces the impact of grain spilling on measuring accuracy.
Beneficial effect of the present invention embodies in the following areas:
(1) adopt capacitance method carry out water content detection, optimal design capacitive transducer again, and designed by software optimization and suitable algorithm to signal linearization, achieve fast and accurately to moisture measurements such as all kinds of foodstuff grains.
(2) use comprehensive fitting algorithm measurement data to merge, automatically can carry out various correction and error compensation to measurement, thus improve reliability and the measuring accuracy of grain moisture content detection system:
(3) Embedded System Structure and real time operating system is adopted, dynamic monitoring is carried out to testing process, realize the transmission process to various information networking, store, call, inquire about, issue and manage, and can analyze real-time information, temperature information, humidity information, warning message etc., for detecting reliability provides scientific basis, reduce handling cost.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the control method of grain heat-drying of the present invention;
Fig. 2 is the comprising modules schematic diagram of the present invention's system used;
Fig. 3 is the structural representation of the present invention's capacitive transducer used.
Embodiment
Further describe the present invention below in conjunction with specific embodiment, advantage and disadvantage of the present invention will be more clear along with description.
Fig. 1 shows the process flow diagram of the control method of a kind of grain heat-drying that the embodiment of the present invention provides, and as shown in Figure 1, comprises the following steps:
According to temperature signal, moisture signal and grain moisture content value, step S101: in grain heat-drying process, judges that grain is the need of carrying out oven dry pattern;
Step S102: when judging that grain needs to enter oven dry pattern, according to temperature signal and moisture signal, obtains thermal control signals;
Step S103: according to described thermal control signals, controls the heating-up temperature of described grain and heat time, makes grain reach target water score value.
Further, the method also comprises, and after the target water score value first setting grain and temperature value, then is sent in MOISTURE MEASUREMENT SYSTEM by the grain to be measured after drying, detects.
Further, the described voltage signal by acquisition is sent to data acquisition controller, as calculated, compares process with NURBS cubic curve, and the controling parameters obtaining dryer comprises:
Judge whether voltage signal is less than the target water score value of grain, if be less than the target water score value of grain, then system can proceed the water content detection of twice automatically; If be more than or equal to the target water score value of grain, then grain can proceed drying and processing.
Further, also comprise after entering MOISTURE MEASUREMENT SYSTEM described in:
By temperature sensor and D/A conversion, obtain the voltage signal of temperature.
Wherein, data acquisition controller adopts single-chip microcomputer and A/D chip as front end data acquisition system, carries out data and gathers, and by Can Link communication, data are sent to computing machine, under Lab VIEW development platform, data are processed, analyze and stores.
Wherein, described MOISTURE MEASUREMENT SYSTEM employs two monostable multi resonant oscillating circuit, counteracts unloaded electric capacity.
Capacitance type foodstuffs MOISTURE MEASUREMENT SYSTEM as shown in Figure 2 comprises: for grain moisture content value being exported the capacitive transducer 1 for capacitance signal; Described capacitance signal is carried out gather, treatment and analyses, display data acquisition module 2; The analysis result obtained through data acquisition module is outputted to computing machine, and the control module 3 of issuing control order; And, for connecting the circuit 4 of described capacitive transducer, data acquisition module and control module.
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 capacitance type foodstuffs 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.
The capacitance type sensor that the application is as shown in Figure 2 used, has red copper material to make, comprising: multiple parallel longitudinal electric capacity being arranged in same flat board gathers dynamo-sheet 111, forms multiple groove structure 11 for victualling; By bolt 13, described electric capacity is gathered the main supporting plate 12 that dynamo-sheet is fixed on an end face; And, be fixedly mounted on the control panel box 14 of another end face of main supporting plate.
Further, described capacitive transducer periphery is provided with metallic shield, and double layer screen line is arranged on described metallic shield cover inner surface, make circuit and sensor be positioned at described metallic shield, decrease stray capacitance and external interference (not shown).
Further, described multiple parallel longitudinal electric capacity being arranged in same flat board gathers dynamo-sheet, and the top forming multiple groove structure for victualling is provided with insulation barrier, reduces grain and overflows and affect (not shown) to measuring accuracy.
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 control method for grain heat-drying, is characterized in that, comprising:
From grain to be measured, choose grain samples, measure the capacitance corresponding to different in moisture in grain samples, by obtaining the NURBS cubic curve of sample moisture and voltage;
After grain heat-drying to be measured, send in MOISTURE MEASUREMENT SYSTEM, by moisture transducer and D/A conversion, obtain the voltage signal of moisture;
The voltage signal of acquisition is sent to data acquisition controller, as calculated, compares with described NURBS cubic curve and process, obtain the controling parameters of dryer, by the instruction of computing machine issuing control, drying course is controlled.
2. the control method of grain heat-drying as claimed in claim 1, is characterized in that, also comprise:
After the target water score value first setting grain and temperature value, then the grain to be measured after drying is sent in MOISTURE MEASUREMENT SYSTEM, detect.
3. the control method of grain heat-drying as claimed in claim 2, it is characterized in that, the described voltage signal by acquisition is sent to data acquisition controller, as calculated, compares process with NURBS cubic curve, and the controling parameters obtaining dryer comprises:
Judge whether voltage signal is less than the target water score value of grain, if be less than the target water score value of grain, then system can proceed the water content detection of twice automatically; If be more than or equal to the target water score value of grain, then grain can proceed drying and processing.
4. the control method of grain heat-drying as claimed in claim 3, is characterized in that, described enter MOISTURE MEASUREMENT SYSTEM after also comprise:
By temperature sensor and D/A conversion, obtain the voltage signal of temperature.
5. the control method of grain heat-drying as claimed in claim 1, it is characterized in that, data acquisition controller adopts single-chip microcomputer and A/D chip as front end data acquisition system, carry out data to gather, and by Can Link communication, data are sent to computing machine, under Lab VIEW development platform, data are processed, analyze and stores.
6. the control method of grain heat-drying as claimed in claim 1, is characterized in that, described MOISTURE MEASUREMENT SYSTEM employs two monostable multi resonant oscillating circuit, counteracts unloaded electric capacity.
7. a capacitance type foodstuffs MOISTURE MEASUREMENT SYSTEM, is characterized in that, comprising:
For grain moisture content value being exported the capacitive transducer for capacitance signal;
Described capacitance signal is carried out gather, treatment and analyses, display data acquisition module;
The analysis result obtained through data acquisition module is outputted to computing machine, and the control module of issuing control order;
For connecting the circuit of described capacitive transducer, data acquisition module and control module.
8. capacitance type foodstuffs MOISTURE MEASUREMENT SYSTEM as claimed in claim 7, is characterized in that, also comprising the power supply for starting MOISTURE MEASUREMENT SYSTEM.
9. capacitance type foodstuffs MOISTURE MEASUREMENT SYSTEM as claimed in claim 8, it is characterized in that, 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.
10. capacitance type foodstuffs MOISTURE MEASUREMENT SYSTEM as claimed in claim 7, it is characterized in that, described capacitive transducer comprises:
Multiple parallel longitudinal electric capacity being arranged in same flat board gathers dynamo-sheet, forms multiple groove structure for victualling;
By erection bolt, described electric capacity is gathered the main supporting plate that dynamo-sheet is fixed on an end face; And,
Be fixedly mounted on the control panel box of another end face of main supporting plate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510085622.3A CN104713918A (en) | 2015-02-17 | 2015-02-17 | Cereal moisture detection method |
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| CN201510085622.3A CN104713918A (en) | 2015-02-17 | 2015-02-17 | Cereal moisture detection method |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI580918B (en) * | 2015-10-29 | 2017-05-01 | Tai Yiaeh Enterprise Co Ltd | The immediate detection method of the drying process |
| CN106932546A (en) * | 2017-03-02 | 2017-07-07 | 安徽广深机电设备有限公司 | The paddy MOISTURE MEASUREMENT SYSTEM and detection method of a kind of crop dryer |
| CN107101861A (en) * | 2017-05-31 | 2017-08-29 | 合肥艾瑞德电气有限公司 | A kind of rolling wheel governor motion and the resistance-type Moisture Meter for possessing the mechanism |
| CN107102034A (en) * | 2017-03-29 | 2017-08-29 | 合肥智纳农业科技有限公司 | A kind of intermittent negative pressure feeding formula grain measurement of moisture content equipment |
| CN107219263A (en) * | 2017-05-31 | 2017-09-29 | 合肥艾瑞德电气有限公司 | One kind of multiple class cereal pattern moisture analysers and moisture measuring method |
| CN107279281A (en) * | 2017-07-10 | 2017-10-24 | 合肥佳粮机械科技有限公司 | A kind of control system based on automation drying grain dryer |
| 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 |
| 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 |
| CN113049650A (en) * | 2021-03-25 | 2021-06-29 | 河北工业大学 | Intelligent calibration system and method for soil humidity sensor |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106932546A (en) * | 2017-03-02 | 2017-07-07 | 安徽广深机电设备有限公司 | The paddy MOISTURE MEASUREMENT SYSTEM and detection method of a kind of crop dryer |
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| CN107101861A (en) * | 2017-05-31 | 2017-08-29 | 合肥艾瑞德电气有限公司 | A kind of rolling wheel governor motion and the resistance-type Moisture Meter for possessing the mechanism |
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| 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 |
| CN113049650A (en) * | 2021-03-25 | 2021-06-29 | 河北工业大学 | Intelligent calibration system and method for soil humidity sensor |
| CN113049650B (en) * | 2021-03-25 | 2023-08-18 | 河北工业大学 | Intelligent calibration system and calibration method for soil humidity sensor |
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Application publication date: 20150617 |