CN86210321U - Microcomputerized measuring glass type grain moisture detector - Google Patents
Microcomputerized measuring glass type grain moisture detector Download PDFInfo
- Publication number
- CN86210321U CN86210321U CN 86210321 CN86210321U CN86210321U CN 86210321 U CN86210321 U CN 86210321U CN 86210321 CN86210321 CN 86210321 CN 86210321 U CN86210321 U CN 86210321U CN 86210321 U CN86210321 U CN 86210321U
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- CN
- China
- Prior art keywords
- circuit
- glass type
- moisture detector
- grain moisture
- model
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The utility model relates to a measuring glass type micro-computerized grain moisture detector, belonging to a capacitive type moisture detector which is provided with a microprocessor. The core of the measuring glass type micro-computerized grain moisture detector is a simplified Z-80 microprocessor. The utility model is provided with a plurality of special circuits, such as, a control program circuit, a moisture measuring link circuit, a temperature measurement link circuit, an analog-digital conversion circuit, a counting circuit, an interface circuit, etc. The measuring glass type micro-computerized grain moisture detector is arranged in a glass type special casing and sampling according to the volume and has the function of automatic temperature compensation and can work by using battery. The utility model can be used in a plurality of grain moisture measurements and can adapt the measured substances whose variety differences are great.
Description
The utility model belongs to the condenser type moisture determination instrument, is to adopt micro-computer technology directly to measure the capacitance kind instrument of cereal moisture content.
In the grain moisture meter device, the moisture determination instrument of capacitance kind has that sampling amount is big, and sample need not pulverized, and accuracy and reappearance are all than advantages such as height.But present condenser type moisture determination instrument exists following shortcoming: (1) requires calibration to measuring kind; (2) can not adapt to bigger breed difference; (3) sampling requirement (100g～150g) that weighs; (4) test result is influenced by environmental temperature, and can not use simultaneously in the gentle room temperature of grain.Thereby operate cumbersomely, range of application is limited.
Task of the present utility model is: designing a kind of is the circuit structure and the corresponding control programs of core with the microprocessor, make instrument need not adjust direct test, can be adapted to multiple kind, replace weighing sampling with the constant volume sampling, improve the influence of environment temperature, thereby improve the accuracy of instrument test and the simplicity of use test result.
The utility model is made of a measuring cup and set of circuits device.Its system design is: a microprocessor of having simplified, it comprises Z-80-Cpu, 6116,74HC138,74HC273,74HC175,74HC02, be furnished with the oscillator of capacitive transducer as oscillation circuit element, temperature sensor, counter, the A/D conversion, tri-state gate circuit and control corresponding software EPROM2716.Z-80 microprocessor system and temperature test part and moisture content part of detecting link.After instrument starts, at first read in the local frequency of empty tube local frequency and reflection water cut information, obtain difference frequency △ f.Read in the tested grain variety formed by key and dial number then, obtain pre-depositing kind constant b and a among the EPROM with lookup table mode.CPU is by water cut (M
1Formula M %)
1%=b △ f+a obtains M
1%.Last according to the grain temperature of reading in by temperature sensor, press M%=M
1± △ M(t ℃) the formula actual water cut ， And that calculates the grain sample show reading by light-emitting diode display.
Characteristics of the present utility model are: (1) instrument adopts microcomputer to control and information processing, need not adjust during test, need not calibrate the test kind of this instrument numbering.(2) can adapt to bigger breed difference, can measure other kinds except that cereal, the method with changing EPROM makes the instrument adapted breed expand the hundreds of kind to.What (3) calibration of standard model is adopted is the method for constant volume, and sample need not weighed, as long as pour capacitive transducer into by a measuring cup volume.(4) the hardware and software auto thermal compensation method of Jia Ruing can reduce the influence of environment temperature to instrument, and And can make it carry out work under the grain temperature condition different with environment temperature, thereby improves the accuracy of instrument test.(5) volume is little, and deadweight can be with battery operated less than 1 kilogram, and the various occasions that are easy to carry are tested.
It below is one group of circuit design of measuring the moisture determination instrument of plurality of cereals.
Hardware is by measurement links (C
1And R
1), counting circuit (U
12), kind numbering reads in circuit (U
8), analog to digital conversion circuit (U
16) and a Z-80 microprocessor form.Measurement links comprises two paths, and one the tunnel is used to measure the moisture content of grain sample, and one the tunnel is used to measure the temperature of grain sample.The water cut information of grain sample is by capacitive transducer (C
1) make local oscillator (U in the variation of pouring into before and after the grain sample owing to the specific inductive capacity of medium
17) frequency changes and reflect.It is by counter (U
12) and triple gate (U
7) input CPU(U
1).By two secondary frequencies read in and on circuit the method for And connection negative temperature coefficient electric capacity can eliminate the influence of environment temperature to local oscillator.By thermistor (R
1) the grain temperature measured, send into CPU by A/D converter.Circuit (the U that the kind numbering is made up of key and dial
8) by triple gate (U
7) read in CPU.Z-80CPU can calculate the actual water cut M% of grain sample according to the algorithm of determining.Pass through LED(U at last
13) control circuit (U
14, U
15) the numerical value M% among the CPU at display (U
13) on show.
The instrument that this design is made can reach following performance:
(1) measurement project: kinds such as paddy, barley, wheat, rapeseed, soybean, jowar, millet, corn can reach more than 40 kinds.
(2) measurement range: 5%～30%.
(3) accuracy: ± 0.5%.
(4) reappearance: ± 0.2%.
(5) test duration: 5 seconds.
(6) service condition: temperature :-10 ℃～+ 40 ℃
Humidity: less than 85%
(7) measuring cup sampling need not weighed.
(8) power supply: 6V can be with battery operated.
(9) power: less than 2 watts.
(10) with the method for changing EPROM, can adapt to bigger breed difference, also can be used to measure the water cut of tealeaves.
Fig. 1 is a hardware block diagram of the present utility model.
Fig. 2 is a program flow diagram of the present utility model.
Claims (2)
1, a kind of condenser type moisture content test macro, be used to measure the water cut of various types of grain, constitute by capacitive transducer, temperature sensor, A/D, counting circuit, tri-state gate circuit, control circuit and sequential circuit, it is characterized in that: the Z-80 microprocessor system of a simplification and temperature test part and moisture content part of detecting link, and this microprocessor system constitutes a signal processing system and Control Software by Z-80CPU, 6116,74HC138,74HC273,74HC175,74HC02 and EPROM2716.
2, microprocessor system according to claim 1 can be measured the water cut of other kinds except that cereal with the method for changing EPROM.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86210321 CN86210321U (en) | 1986-12-15 | 1986-12-15 | Microcomputerized measuring glass type grain moisture detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86210321 CN86210321U (en) | 1986-12-15 | 1986-12-15 | Microcomputerized measuring glass type grain moisture detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN86210321U true CN86210321U (en) | 1987-11-11 |
Family
ID=4812032
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 86210321 Expired - Lifetime CN86210321U (en) | 1986-12-15 | 1986-12-15 | Microcomputerized measuring glass type grain moisture detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN86210321U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100410632C (en) * | 2004-03-10 | 2008-08-13 | 杨世勋 | Device for measuring liquid quantity in arbitrary containers |
| CN105651832A (en) * | 2014-11-15 | 2016-06-08 | 新疆科立机械设备有限公司 | A material water content measuring sensor structure based on a capacitance principle |
| CN105651831A (en) * | 2014-11-15 | 2016-06-08 | 新疆科立机械设备有限公司 | A device of measuring the water content of a granular material based on capacitance |
-
1986
- 1986-12-15 CN CN 86210321 patent/CN86210321U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100410632C (en) * | 2004-03-10 | 2008-08-13 | 杨世勋 | Device for measuring liquid quantity in arbitrary containers |
| CN105651832A (en) * | 2014-11-15 | 2016-06-08 | 新疆科立机械设备有限公司 | A material water content measuring sensor structure based on a capacitance principle |
| CN105651831A (en) * | 2014-11-15 | 2016-06-08 | 新疆科立机械设备有限公司 | A device of measuring the water content of a granular material based on capacitance |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |