CN202305462U - Device for online measurement of grain moisture - Google Patents
Device for online measurement of grain moisture Download PDFInfo
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- CN202305462U CN202305462U CN2011203907718U CN201120390771U CN202305462U CN 202305462 U CN202305462 U CN 202305462U CN 2011203907718 U CN2011203907718 U CN 2011203907718U CN 201120390771 U CN201120390771 U CN 201120390771U CN 202305462 U CN202305462 U CN 202305462U
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Abstract
The utility model discloses a device for the online measurement of grain moisture. The device comprises a capacitive sensor, a signal conversion circuit, a temperature signal acquisition circuit, a singlechip processing unit, a key and a liquid crystal display (LCD), wherein the capacitive sensor is connected with the singlechip processing unit through the signal conversion circuit, the temperature signal acquisition circuit is directly connected with the singlechip processing unit, and the key and the LCD are respectively connected with the singlechip processing unit. According to the device for the online measurement of the grain moisture, the circuits are simple, only one AT89S5X chip and some simple peripheral devices are used, and the influence on moisture content measurement, caused by factors, such as temperature and categories of grains, is taken into account through compensating coefficients by using software, so that the device for the online measurement of the grain moisture has higher flexibility and practicability. The device for the online measurement of the grain moisture is a practical and low-cost online measurement device for the grain moisture, and the granular products, such as rice grains, rice, soybeans, barley, wheat, corns and the like, in agricultural production, can be measured.
Description
Technical field
The utility model relates to a kind of grain moisture measurement mechanism, especially relates to the device that a kind of online in real time that adopts capacitance method is measured grain moisture.
Background technology
The cereal drying is an important step in grain and the processing of farm products.According to statistics, the annual crops of China go rotten with a toll of 5,000,000～1,000 ten thousand t, estimate to account for 1.5%～3% of cereal total production.Loss is gone rotten up to about 10% in the southern province (like Jiangsu, Zhejiang, Anhui, Hubei and Shanghai and other places) that plum rain season is long, annual grain.But up to now, the cereal drying also is a relatively weaker link in the agricultural production of China.Subject matter is: drying capacity deficiency, inefficiency and dried materials quality are poor.And development perfect automatic control equipment is important meaning to keeping cereal baking back quality, reducing operating cost and boost productivity.Thereby measuring grain moisture fast, accurately and real-time is again to realize the cereal dry run key of control automatically.
At present, the instrument of measurement grain moisture content mainly contains resistor type cereal moisture transducer, condenser type grain moisture on-line measurement sensor, infrared ray absorbing formula grain moisture sensor, microwave type grain moisture on-line measurement device and middle minor grain moisture on-line measurement device etc.The resistance-type moisture transducer will be pulverized sample when measuring, and be destructive the measurement, and Measuring Time is longer, can not measure high moisture content.Resistance sensor can be used for the monitoring as the dry elementary grain moisture of crop dryer of commodity food or feed, but is not suitable for the control that seed drying and control accuracy require high moral cereal dry run; Infrared ray absorbing formula grain moisture sensor is the non-cpntact measurement form, is easy to rapid Continuous and measures moisture, but because of the influence of the shape that receives tested material, size, density, can not measure the moisture of material inside; Microwave type grain moisture on-line measurement device can be realized rapid Continuous Determination, but also receives the shape of tested material, the influence of density, and price is higher; Middle minor grain moisture on-line measurement device can not destroy the structure of material; Not influencing the proper motion state of material, need not take a sample, is a kind of more advanced online moisture measuring method; But its price is higher; And need take safeguard procedures, in order to avoid neutron is revealed, be applicable to large-scale grain drying system; Compare mutually, condenser type grain moisture on-line sensor has advantages such as simple in structure, cheap, easy to operate, firm, is suitable for real-time testing, so use morely.
The principle that capacitance method is surveyed cereal moisture percentage is: relevant between the DIELECTRIC CONSTANTS of capacitor C and medium, the relative area S of pole plate, two-plate apart from d etc., work as S, and when d is steady state value, C=f (ε) is arranged then.But the specific inductive capacity of safety storing cereal is generally 2～3, and the specific inductive capacity of water is 80.37 (20 ℃).The condenser type moisture transducer is a medium with the cereal of certain water percentage; The variation of water percentage can cause the variation of cereal specific inductive capacity; Thereby cause the variation of the capacity of condenser of carrying certain cereal, the signal that detects electric capacity is handled again, i.e. the value of corresponding water percentage.
Summary of the invention
The purpose of the utility model is to provide a kind of online grain moisture measurement mechanism; Remedy additive method and measured the defect of insufficient of grain moisture in real time, also solved problem that existing condenser type moisture measuring method is difficult to overcome temperature and material variety factor affecting simultaneously.
The technical scheme that the utility model adopts is:
The utility model comprises capacitance type sensor, signaling conversion circuit, temperature signal collection circuit, single-chip microcomputer processing unit, button and LCD; Capacitance type sensor links to each other with the single-chip microcomputer processing unit through signaling conversion circuit, and temperature signal collection circuit directly links to each other with the single-chip microcomputer processing unit, and button links to each other with the single-chip microcomputer processing unit respectively with LCD.
Said signaling conversion circuit adopts and is made up of CAV444 chip and peripheral circuits thereof; The capacitance type sensor of wherein measuring moisture connects the 12nd pin of CAV444 chip, and the capacitance signal of capacitance type sensor is exported the P3.0 mouth that connects single-chip microcomputer processing unit AT89S5X chip by the 5th pin after CAV444 handles.
Said temperature signal collection circuit by resistance temperature detector PT100 and on every side treatment circuit constitute, the resistance signal of temperature variation connects single-chip microcomputer P1.0 mouth through TCL2543 chip conversion after ADOP07 and AD620AD two-stage processing and amplifying.
Described single-chip microcomputer processing unit adopts the AT89S5X series monolithic.
Described button is a 4*4 matrix form input keyboard, and eight lead-in wires on the keyboard link to each other with the P0.0-P0.7 mouth of single chip computer AT 89S5X chip respectively.
Described LCD types is LM2068, eight single data on LCD lead-in wire DB0 ~ DB7 respectively with single chip computer AT 89S5X chip P.2.0 ~ P2.7 links to each other the CS of LCD, RS; WR, RD, the P3.6 of RST lead-in wire order sheet machine chip, P3.7; P2.7, PSEN, ALE mouth.
The beneficial effect that the utlity model has is:
The utility model circuit is simple; An AT89S5X family chip and some simple peripheral components have only been used; And through the software compensation coefficient temperature, cereal kind factor are taken into account the influence of measurement of water ratio, had higher flexibility and practicality.The utility model is a grain moisture on-line measurement device a kind of practicality, that price is very cheap, can measure the granular product of agricultural production, like paddy, and rice, soybean, barley, wheat, corn etc.
Description of drawings
Fig. 1 is online grain moisture measurement mechanism structured flowchart.
Fig. 2 is the signaling conversion circuit figure of the utility model.
Fig. 3 is the temperature signal collection circuit figure of the utility model.
Fig. 4 is the single-chip microcomputer processing unit circuit diagram of the utility model.
Fig. 5 is the key circuit figure of the utility model.
Fig. 6 is the LCD circuit figure of the utility model.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is made further explanation.
As shown in Figure 1, the utility model comprises capacitance type sensor, signaling conversion circuit, temperature signal collection circuit, single-chip microcomputer processing unit, button and LCD; Capacitance type sensor links to each other with the single-chip microcomputer processing unit through signaling conversion circuit, and temperature signal collection circuit directly links to each other with the single-chip microcomputer processing unit, and button links to each other with the single-chip microcomputer processing unit respectively with LCD.
As shown in Figure 2; Said signaling conversion circuit adopts and is made up of CAV444 chip and peripheral circuits thereof; The capacitance type sensor of wherein measuring moisture connects the 12nd pin of CAV444 chip, and the capacitance signal of capacitance type sensor is exported the P3.0 mouth that connects single-chip microcomputer processing unit AT89S5X chip by the 5th pin after CAV444 handles.
Described signaling conversion circuit will reflect that the capacitance signal of moisture converts voltage signal into, be connected with the single-chip microcomputer processing unit again, and signaling conversion circuit constitutes multi-resonant circuit by the CAV44 chip internal and realized the C/F conversion, and its resonant frequency equation is f
x=1.44/RC
x(C
xBy being asked electric capacity, R is a resistance value), use voltage-frequency---press the frequency volt circuit of transducer to carry out the F/V conversion frequently, V is arranged
x=Mf
x(mv) (f
xUnit (Hz), M are constant), convert capacitance signal to voltage signal V through such conversion
x
As shown in Figure 3, said temperature signal collection circuit by resistance temperature detector PT100 and on every side treatment circuit constitute, the resistance signal of temperature variation connects single-chip microcomputer P1.0 mouth through TCL2543 chip conversion after ADOP07 and AD620AD two-stage processing and amplifying.
Temperature signal collection circuit is through temperature sensor and treatment circuit collecting temperature variable signal; Link to each other with the single-chip microcomputer processing unit; Temperature signal collection circuit can be given single-chip microcomputer with current grain temperature value; Single-chip microcomputer can distribute a penalty coefficient according to the scope at this temperature value place, can eliminate the influence of temperature factor to the grain moisture monitoring like this.
As shown in Figure 4, described single-chip microcomputer processing unit adopts the AT89S5X series monolithic.
As shown in Figure 5, described button is a 4*4 matrix form input keyboard, and eight lead-in wires on the keyboard link to each other with the P0.0-P0.7 mouth of single chip computer AT 89S5X chip respectively.Import different cereal kind category codes to be measured through keyboard, the single-chip microcomputer in house software selects different offsets to realize the various types of grain moisture measurement.
As shown in Figure 6, described LCD types is LM2068, eight single data on LCD lead-in wire DB0 ~ DB7 respectively with single chip computer AT 89S5X chip P.2.0 ~ P2.7 links to each other; The CS of LCD, RS, WR; RD, the P3.6 of RST lead-in wire order sheet machine chip, P3.7; P2.7, PSEN, ALE mouth.Real current grain temperature, cereal kind and grain moisture content value that the LCD screen meeting is real-time.
The principle of work of the utility model:
In the time will drying a kind of cereal; The field staff needs in advance that this cereal kind is corresponding code to be input in the online Measuring Instrument for Grain Moisture Content through keyboard; Such as code A correspondence is wheat; What B was corresponding is corn or the like, and when the wheat that oven dry has just been gathered in the crops, tester can show " please import cereal kind to be dried "; Pass through keyboard with A input test appearance according to the prompting field staff then; At this time tester can show " current drying be wheat " printed words, and tester begins to carry out the temperature and humidity signals sampling simultaneously, and the inner single-chip microcomputer of tester can draw the current moisture that is processed cereal after the factor affecting of temperature and humidity signal through computing compensation temperature and material variety according to input value and sampling; And its numerical value shown tester screen display after several seconds " current wheat temperature is * * ℃ " printed words and " current wheat water content content is * * % " printed words.Grain temperature value and moisture value can constantly change along with the youngster that carries out of drying, carry out drying if change the cereal of other kinds, please be through button input ESC, and B has also gone the drying of a new round according to the corresponding code of the another kind of material variety of prompting input.This contrive equipment is simple in structure, and is easy to operate, has good practicality and applicability.
Claims (6)
1. an online grain moisture measurement mechanism is characterized in that: comprise capacitance type sensor, signaling conversion circuit, temperature signal collection circuit, single-chip microcomputer processing unit, button and LCD; Capacitance type sensor links to each other with the single-chip microcomputer processing unit through signaling conversion circuit, and temperature signal collection circuit directly links to each other with the single-chip microcomputer processing unit, and button links to each other with the single-chip microcomputer processing unit respectively with LCD.
2. a kind of online grain moisture measurement mechanism according to claim 1; It is characterized in that: said signaling conversion circuit adopts and is made up of CAV444 chip and peripheral circuits thereof; The capacitance type sensor of wherein measuring moisture connects the 12nd pin of CAV444 chip; The capacitance signal of capacitance type sensor by the output of the 5th pin, connects the P3.0 mouth of single-chip microcomputer processing unit AT89S5X chip after the CAV444 chip is handled.
3. a kind of online grain moisture measurement mechanism according to claim 1; It is characterized in that: said temperature signal collection circuit by resistance temperature detector PT100 and on every side treatment circuit constitute, the resistance signal of temperature variation connects single-chip microcomputer P1.0 mouth through TCL2543 chip conversion after ADOP07 and AD620AD two-stage processing and amplifying.
4. according to a kind of online grain moisture measurement mechanism described in the claim 1, it is characterized in that: described single-chip microcomputer processing unit adopts the AT89S5X series monolithic.
5. according to a kind of online grain moisture measurement mechanism described in the claim 1, it is characterized in that: described button is a 4*4 matrix form input keyboard, and eight lead-in wires on the keyboard link to each other with the P0.0-P0.7 mouth of single chip computer AT 89S5X chip respectively.
6. according to a kind of online grain moisture measurement mechanism described in the claim 1, it is characterized in that: described LCD types is LM2068, eight single data on LCD lead-in wire DB0 ~ DB7 respectively with single chip computer AT 89S5X chip P.2.0 ~ P2.7 links to each other; The CS of LCD, RS, WR; RD, the P3.6 of RST lead-in wire order sheet machine chip, P3.7; P2.7, PSEN, ALE mouth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203907718U CN202305462U (en) | 2011-10-14 | 2011-10-14 | Device for online measurement of grain moisture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203907718U CN202305462U (en) | 2011-10-14 | 2011-10-14 | Device for online measurement of grain moisture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202305462U true CN202305462U (en) | 2012-07-04 |
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ID=46374334
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203907718U Expired - Fee Related CN202305462U (en) | 2011-10-14 | 2011-10-14 | Device for online measurement of grain moisture |
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| CN (1) | CN202305462U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104101624A (en) * | 2014-07-14 | 2014-10-15 | 南京沃杨机械科技有限公司 | On-line grain moisture measuring instrument |
| CN104704355A (en) * | 2012-08-08 | 2015-06-10 | Ctb有限公司 | Grain bin capacitive moisture sensor system and method |
| CN106053543A (en) * | 2016-08-14 | 2016-10-26 | 张海娟 | On-line moisture detection apparatus for vertical dryer |
-
2011
- 2011-10-14 CN CN2011203907718U patent/CN202305462U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104704355A (en) * | 2012-08-08 | 2015-06-10 | Ctb有限公司 | Grain bin capacitive moisture sensor system and method |
| CN104704355B (en) * | 2012-08-08 | 2017-10-13 | Ctb有限公司 | Silo capacitance type humidity sensor system and method |
| CN104101624A (en) * | 2014-07-14 | 2014-10-15 | 南京沃杨机械科技有限公司 | On-line grain moisture measuring instrument |
| CN104101624B (en) * | 2014-07-14 | 2016-06-01 | 南京沃杨机械科技有限公司 | A kind of online grain moisture measuring apparatus |
| CN106053543A (en) * | 2016-08-14 | 2016-10-26 | 张海娟 | On-line moisture detection apparatus for vertical dryer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120704 Termination date: 20151014 |
|
| EXPY | Termination of patent right or utility model |