CN105651833A - A method of measuring the water content of a granular material based on capacitance - Google Patents
A method of measuring the water content of a granular material based on capacitance Download PDFInfo
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- CN105651833A CN105651833A CN201410650414.9A CN201410650414A CN105651833A CN 105651833 A CN105651833 A CN 105651833A CN 201410650414 A CN201410650414 A CN 201410650414A CN 105651833 A CN105651833 A CN 105651833A
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Abstract
The invention provides a method of measuring the water content of a granular material based on capacitance, belongs to the field of water measurement and particularly relates to a method of measuring the water content of a granular material based on capacitance. The method effectively overcomes the difficult problem of online water content measurement for abrasive materials, allows the water content of gravel aggregate in a material blending and stirring step which is a critical step of large-scale commercial concrete production to be controllable accurately, allows water content measurement to be reliable for a long period, and makes production stable. The method includes a) allowing positive and negative plates of a capacitor to be opposite and parallel, putting a standard sample between the positive plate and the negative plate, and measuring capacitance through an instrument, b) putting a sample to be tested between the positive plate and the negative plate with the size of the sample to be tested being same as the size of the standard sample, and measuring capacitance again through the instrument, and c) comparing the capacitance of the standard sample and the capacitance of the sample to be tested, and regulating the water content of a material according to needs.
Description
Technical field
The present invention relates to material moisture field of measuring technique, be a kind of method based on electric capacity measuring granular material moisture.
Background technology
In extensive commerical ready-mixed concrete produces, concrete proportioning design is based on the correct proportions mixing of powdered adhesive gel material (such as cement, active slag micropowder, flyash), various aggregate (such as natural sand, fluvial sand, quartz sand, Machine-made Sand, cobble, haydite etc.), water and additive. What wherein consumption was maximum belongs to sand, stone aggregate, and especially with sand for very, if the moisture of sand, stone reduces 2%, feed proportioning system will increase by the sandstone of 2% by mistake and add water less, causes that concrete production mix tends to dry, and even mix is insufficient, affects concrete quality. In this case, if operator adds water more, the ratio of water and cement increases, and may result in concrete hardness and reduces, even affects intensity, and cement increases cost and also can rise. In customary commercial concrete production, sand, stone aggregate source changeable, wherein the moisture in washed-out sand is difficult to control especially. If moisture can accurately be measured, mixed proportion is correct, the situation adding extra water or amount of water deficiency just can be avoided to occur, just can obtain the concrete of complete correct proportions mixing, reach mix-design index, meet designing quality requirement, it is seen that at extensive commerical ready-mixed concrete production field, the importance that moisture is accurately measured, equally possible other chemical industry, medicine, food, the metallurgy etc. of extending to need to measure the technical field of tempering property material or generally conventional material moisture.
But, up to the present domestic the reliable online Water content measurement sensor being applicable to tempering property medium (such as sandstone) or the system of measurement are still found no, and affected very big by temperature, ambient humidity, measurement error is bigger, it is difficult to meet that tempering property medium is continuous and the measurement requirement of accurate moisture, production process is caused to be difficult to be precisely controlled, product quality extremely unstable.
Electric capacity (Capacitance) is also referred to as " capacitance ", refers to the electric charge reserves under given potential difference; In general, electric charge in the electric field can stress and move, between conductor, had medium, then hindering electric charge moves and makes charge accumulation on conductor, causes the accumulation of electric charge to store.
Generally can according to the capacitance of electric capacity C=�� S/4 �� Kd(C capacitor; S pole plate right opposite amasss; �� electric medium constant; K electrostatic force constant; �� is pi; D polar plate spacing) formula, obtain capacitance; When long-pending S, polar plate spacing d mono-timing of pole plate right opposite, capacitance is only relevant to electric medium constant ��, and electric medium constant �� is relevant with the composition of material, and therefore when the composition of material is also similar, capacitance is similar.
Summary of the invention
The invention provides a kind of method based on electric capacity measuring granular material moisture, overcome the deficiency of prior art, can effectively solve existing tempering a property material difficult problem at moisture measurement, extensive commerical ready-mixed concrete is made to produce key link dispensing agitating procedure sandstone aggregate moisture content precisely controlled, long period is reliable to make moisture measurement accomplish, steady production.
The technical scheme is that and realized by following measures, a kind of method based on electric capacity measuring granular material moisture, measuring method comprises the following steps:
A. capacitance cathode plate is parallel with electric capacity negative plate relative, puts into standard sample between capacitance cathode plate and electric capacity negative plate, measures its electric capacity by instrument;
That b. puts into same volume between capacitance cathode plate and electric capacity negative plate treats test sample, measures its electric capacity again by instrument;
C. the size of standard of comparison sample and the electric capacity treating test sample, thus adjusting the water content of material on demand.
Between further capacitance cathode plate and electric capacity negative plate, space size is fixed.
Detailed description of the invention:
The present invention, not by the restriction of following embodiment, can determine specific embodiment according to technical scheme and practical situation.
Embodiment 1: a kind of method based on electric capacity measuring granular material moisture, measuring method comprises the following steps:
A. capacitance cathode plate is parallel with electric capacity negative plate relative, puts into standard sample between capacitance cathode plate and electric capacity negative plate, measures its electric capacity by instrument;
That b. puts into same volume between capacitance cathode plate and electric capacity negative plate treats test sample, measures its electric capacity again by instrument;
C. the size of standard of comparison sample and the electric capacity treating test sample, thus adjusting the water content of material on demand.
Space size between further capacitance cathode plate and electric capacity negative plate is fixed.
The present embodiment instrument is universal bridge is QS18A type universal bridge.
Above technical characteristic constitutes highly preferred embodiment of the present invention, and it has stronger adaptability and best implementation result, can increase and decrease inessential technical characteristic according to actual needs, meet the needs of different situations.
Claims (2)
1. the method based on electric capacity measuring granular material moisture, it is characterised in that comprise the following steps:
A. capacitance cathode plate is parallel with electric capacity negative plate relative, puts into standard sample between capacitance cathode plate and electric capacity negative plate, measures its electric capacity by instrument;
That b. puts into same volume between capacitance cathode plate and electric capacity negative plate treats test sample, measures its electric capacity again by instrument;
C. the size of standard of comparison sample and the electric capacity treating test sample, thus adjusting the water content of material on demand.
2. a kind of method based on electric capacity measuring granular material moisture according to claim 1, it is characterised in that: between capacitance cathode plate and electric capacity negative pole, space size is fixed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410650414.9A CN105651833A (en) | 2014-11-15 | 2014-11-15 | A method of measuring the water content of a granular material based on capacitance |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410650414.9A CN105651833A (en) | 2014-11-15 | 2014-11-15 | A method of measuring the water content of a granular material based on capacitance |
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| CN105651833A true CN105651833A (en) | 2016-06-08 |
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| CN201410650414.9A Pending CN105651833A (en) | 2014-11-15 | 2014-11-15 | A method of measuring the water content of a granular material based on capacitance |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106093145A (en) * | 2016-08-15 | 2016-11-09 | 哈尔滨理工大学 | The measurement apparatus of green sand moisture and moisture measurement method based on this device |
| WO2020223998A1 (en) * | 2019-05-07 | 2020-11-12 | 中山市武汉理工大学先进工程技术研究院 | Device and method for detecting water content of sand and gravel aggregate |
| CN112730539A (en) * | 2020-12-23 | 2021-04-30 | 中山艾尚智同信息科技有限公司 | Detection equipment for sandstone moisture content based on interdigital capacitor |
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| CN1065528A (en) * | 1991-03-29 | 1992-10-21 | 龚少楠 | A kind of tester fo moisture content in rosin |
| CN1396448A (en) * | 2001-07-13 | 2003-02-12 | 三升农机科技股份有限公司 | Nondestructive multi-purpose water content tester |
| CN2752771Y (en) * | 2004-06-11 | 2006-01-18 | 三升农机科技股份有限公司 | Multi-functional moisture check meter |
| CN201060177Y (en) * | 2007-07-19 | 2008-05-14 | 付强 | Data pick-up apparatus for stochastic analyzing water content of lubricant oil |
| CN102338728A (en) * | 2010-07-21 | 2012-02-01 | 上海台界化工有限公司 | Method for quickly comparing and detecting performance index of concrete water reducing agent |
| KR101232685B1 (en) * | 2011-10-24 | 2013-02-13 | 한국건설생활환경시험연구원 | Method of measuring unit water content using unit air volume in fresh concrete adding to method of electrostatic capacity |
| JP2013195186A (en) * | 2012-03-19 | 2013-09-30 | Fujita Corp | Method and apparatus for evaluating water content of cement-based material during hardening process |
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2014
- 2014-11-15 CN CN201410650414.9A patent/CN105651833A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1065528A (en) * | 1991-03-29 | 1992-10-21 | 龚少楠 | A kind of tester fo moisture content in rosin |
| CN1396448A (en) * | 2001-07-13 | 2003-02-12 | 三升农机科技股份有限公司 | Nondestructive multi-purpose water content tester |
| CN2752771Y (en) * | 2004-06-11 | 2006-01-18 | 三升农机科技股份有限公司 | Multi-functional moisture check meter |
| CN201060177Y (en) * | 2007-07-19 | 2008-05-14 | 付强 | Data pick-up apparatus for stochastic analyzing water content of lubricant oil |
| CN102338728A (en) * | 2010-07-21 | 2012-02-01 | 上海台界化工有限公司 | Method for quickly comparing and detecting performance index of concrete water reducing agent |
| KR101232685B1 (en) * | 2011-10-24 | 2013-02-13 | 한국건설생활환경시험연구원 | Method of measuring unit water content using unit air volume in fresh concrete adding to method of electrostatic capacity |
| JP2013195186A (en) * | 2012-03-19 | 2013-09-30 | Fujita Corp | Method and apparatus for evaluating water content of cement-based material during hardening process |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106093145A (en) * | 2016-08-15 | 2016-11-09 | 哈尔滨理工大学 | The measurement apparatus of green sand moisture and moisture measurement method based on this device |
| WO2020223998A1 (en) * | 2019-05-07 | 2020-11-12 | 中山市武汉理工大学先进工程技术研究院 | Device and method for detecting water content of sand and gravel aggregate |
| CN112730539A (en) * | 2020-12-23 | 2021-04-30 | 中山艾尚智同信息科技有限公司 | Detection equipment for sandstone moisture content based on interdigital capacitor |
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Application publication date: 20160608 |