CN103335927B - A kind of cereal porosity measurement device and measuring method thereof - Google Patents
A kind of cereal porosity measurement device and measuring method thereof Download PDFInfo
- Publication number
- CN103335927B CN103335927B CN201310158965.9A CN201310158965A CN103335927B CN 103335927 B CN103335927 B CN 103335927B CN 201310158965 A CN201310158965 A CN 201310158965A CN 103335927 B CN103335927 B CN 103335927B
- Authority
- CN
- China
- Prior art keywords
- cereal
- cylinder
- valve
- variometer
- pipeline
- Prior art date
- 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 - Fee Related
Links
Abstract
The invention discloses a kind of cereal porosity measurement device, comprise air compressor, pipeline, gas admittance valve, cylinder, vent valve, cereal container, variometer and control display device, described cylinder is connected with air compressor and cereal container respectively by pipeline, described gas admittance valve is installed on the pipeline between air compressor and cylinder, and described vent valve is installed on the pipeline between cereal container and cylinder; Described variometer is installed on cylinder, and described variometer is connected with control display device; Described gas admittance valve and vent valve are all connected with control display device.The invention also discloses a kind of measuring method of cereal porosity measurement device.Structure of the present invention is simple, and easy to operate, decreases workload; The present invention is air by the medium used, thus avoids the hydroscopicity of cereal or volatile impact of organic solvent, improves the accuracy of measurement result, ensure that the reliability of measurement result.
Description
Technical field
The present invention relates to porosity detection technique field, be specifically related to a kind of cereal porosity measurement device and measuring method thereof.
Background technology
Porosity is the important physical characteristics of cereal, be grain dry, processing, storage, Design of Ventilation System and research air-flow and hot-fluid motion time important parameter.It is volume of voids between cereal and the ratio of volume shared by the whole cereal comprising hole, and it is relevant with factors such as cereal shape, accumulation or filling method, cereal Size Distribution, impure kind and quantity, surface nature and water cut.The size of bulk material porosity, usually calculate according to the relation of the unit weight of bulk granular material, the relative density of material and porosity, computing formula is
wherein ε is porosity, ρ
ωfor the relative density of material, ρ is the unit weight of material.
Above-mentioned method running program is complicated, and workload is large, need to measure bulk granular material unit weight and relative density, and the error of measurement result is large.Measuring method as relative density has graduated cylinder method, pycnometer method and balance density assembly method at present.1. graduated cylinder method is simple, quick, but the resultant error obtained is large, is suitable only for rough measure; 2. balance density assembly method, needs 100,000/balance, also very strict to environmental requirement, so apply seldom; 3. pycnometer method is relatively simple, but pycnometer method all will determine the volume of sample with above-mentioned two kinds of methods based on Archimedes' principle, namely all must be immersed in the middle of liquid and measures testing sample.Because cereal has hydroscopicity, when making solvent with water, then there is very big error in measurement result; And when adopting organic solvent, because organic solvent exists high volatility, especially when temperature is higher, volatilize than very fast, not only reliability and the same error of measurement result is very large.
Summary of the invention
The deficiency that the present invention exists to overcome above prior art, it is a kind of simple to operate, reasonable to provide, and measurement result is cereal porosity measurement device accurately; Additionally provide a kind of cereal hole measuring method simultaneously.
Object of the present invention is realized by following technical scheme: this cereal porosity measurement device, comprise air compressor, pipeline, gas admittance valve, cylinder, vent valve, cereal container, variometer and control display device, described cylinder is connected with air compressor and cereal container respectively by pipeline, described gas admittance valve is installed on the pipeline between air compressor and cylinder, and described vent valve is installed on the pipeline between cereal container and cylinder; Described variometer is installed on cylinder, and described variometer is connected with control display device; Described gas admittance valve and vent valve are all connected with control display device.
Load cereal for convenience of cereal container, described cereal container comprises main body for loading cereal and top pressure closure, and the top of described main body is provided with opening, and described top pressure closure is sealedly attached to the opening of main body.
Described control display device comprises touch-screen, the gentle valve control unit, VCU of single-chip microcomputer; Described touch-screen is connected with single-chip microcomputer, and described variometer is connected with single-chip microcomputer; Described gas admittance valve and vent valve are all connected with single-chip microcomputer by Air Valve Control unit.
Described variometer is air pressure transmitter.
For realizing automatic control, described gas admittance valve is air inlet electromagnetic valve, and described vent valve is exhaust solenoid valve.
The volume of described cylinder is equal with the volume of cereal container.
The measuring method of described a kind of cereal porosity measurement device, comprises the steps:
A, after the main body of cereal container fills cereal, be then tightly connected by the opening of top pressure closure and main body, now, gas admittance valve and vent valve are open mode; Detect the air pressure size in cylinder by variometer, after the stable gas pressure in cylinder, variometer is by the value P of this stable air pressure
1be sent in single-chip microcomputer;
After b, closedown vent valve, open air compressor, extraneous air enters cylinder by air compressor, thus the air pressure in cylinder is increased; When the cylinder in air pressure reaches certain atmospheric pressure value P
0after, close gas admittance valve, after the air pressure in cylinder is again stable, variometer is by the atmospheric pressure value P after again stable
2be sent in single-chip microcomputer;
C, open vent valve, the gas in cylinder is entered in cereal container by pipeline, thus makes the air pressure in cylinder and cereal container balance again, the atmospheric pressure value P after this balances by variometer
3be sent in single-chip microcomputer;
D, described volume of cylinder are V
1, the volume of the pipeline between described gas admittance valve and vent valve is V
2, the volume of the pipeline between described cereal container and vent valve is V
3, the volume of voids of described cereal is V
0, the porosity of cereal is ε, according to the Ideal-Gas Equation PV=MRT and porosity computing formula
then single-chip microcomputer passes through formula:
Calculate the porosity of cereal, and the value of porosity is shown in touch-screen.
According to the Ideal-Gas Equation equation P V=MRT, following relational expression can be drawn:
P
1V
1′＝M
1RT (1), V
1′＝V
0+V
2(4)，
P
2V
2′＝M
2RT (2), V
2′＝V
1+V
3(5)，
P
3V
3′＝M
3RT (3), V
3′＝V
1′+V
2′ (6),
Wherein M
1quality for the gas of the pipeline between gas admittance valve and vent valve adds the quality of the gas in cereal hole; And M
2for the gaseous mass in cylinder adds the gaseous mass of the pipeline between upper inlet valve and vent valve; And M
3=M
1+ M
2(7).
Therefore by relational expression (1), (2), (3), (4), (5), (6), (7) and
the calculating formula obtaining cereal porosity is:
By substituting into measuring the data obtained the value that above-mentioned relation can obtain cereal porosity.
Described atmospheric pressure value P
0size be 0.5 ~ 0.6MPa.
The present invention has following advantage relative to prior art: the structure of this cereal porosity measurement device is simple, and easy to operate, decreases workload; The medium that this cereal porosity measurement device and measuring method thereof use is air, therefore can not produce any impact to the physical property of cereal, namely can not waste cereal, thus reduce measurement cost; The medium that this cereal porosity measurement device and measuring method thereof use is air, avoid using water or organic solvent as medium, thus avoid the hydroscopicity of cereal or volatile impact of organic solvent, improve the accuracy of measurement result, ensure that the reliability of measurement result.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of cereal porosity measurement device of the present invention.
Fig. 2 is the circuit theory diagrams of control display device of the present invention.
Fig. 3 is testing process schematic diagram of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
A kind of cereal porosity measurement device as depicted in figs. 1 and 2, comprise air compressor 3, pipeline, gas admittance valve 4, cylinder 1, vent valve 5, cereal container, variometer 6 and control display device, described cylinder 1 is connected with air compressor 3 and cereal container 2 respectively by pipeline, described gas admittance valve 4 is installed on the pipeline between air compressor 3 and cylinder 1, and described vent valve 5 is installed on the pipeline between cereal container and cylinder 1; Described variometer 6 is installed on cylinder 1, and described variometer 6 is connected with control display device; Described gas admittance valve 4 and vent valve 5 are all connected with control display device.Described air compressor is preferably TYW-1 type low noise, oil-free air compressor.
Load cereal for convenience of cereal container, described cereal container comprises main body 2 for loading cereal and top pressure closure 9, and the top of described main body 2 is provided with opening, and described top pressure closure 9 is sealedly attached to the opening of main body 2.Described cereal container is cylindrical, an outer wall milling seal groove at the top of described cereal container, by fluorine glue 0 type circle embedding sealing ring recess, realizes being tightly connected with coordinating of fluorine glue 0 type circle by top pressure closure 9.
Described control display device comprises touch-screen 8, the gentle valve control unit, VCU of single-chip microcomputer 7; Described touch-screen 8 is connected with single-chip microcomputer 7, and described variometer 6 is connected with single-chip microcomputer 7; Described gas admittance valve 4 is all connected with single-chip microcomputer 7 by Air Valve Control unit with vent valve 5.Described Air Valve Control unit comprises two relays, and single-chip microcomputer 7 is connected with gas admittance valve 4 by one of them relay, thus controls unlatching or the closedown of gas admittance valve 4; And single-chip microcomputer 7 is connected with vent valve 5 by another relay, thus control unlatching or the closedown of vent valve 5.The model of the preferred relay of the present embodiment is G3TB-ODX03P, and the model of single-chip microcomputer 7 is STC12C5620AD; The model of touch-screen 8 is DMT48270C043_02W.
Described variometer 8 is air pressure transmitter.Described air pressure transmitter is installed on the center at the top of cylinder 1, and selecting of the model of air pressure transmitter can determine according to actual conditions, and the model of the preferred air pressure transmitter of the present embodiment is MEA3300-1MPa-V1-B4-C3-P1.
For realizing automatic control, described gas admittance valve 4 is air inlet electromagnetic valve, and described vent valve 5 is exhaust solenoid valve.Described air inlet electromagnetic valve and exhaust solenoid valve are bi-bit bi-pass air-operated solenoid valve, and the model of the preferred bi-bit bi-pass air-operated solenoid valve of the present embodiment is VCA21-5G-3-02.
The volume of described cylinder 1 is equal with the volume of cereal container.
As shown in Figure 3, the measuring method of described a kind of cereal porosity measurement device, comprises the steps:
A, after the main body 2 of cereal container fills cereal, be then tightly connected by top pressure closure 9 opening with main body 2, now, gas admittance valve 4 and vent valve 5 are open mode; Detected the air pressure size in cylinder by variometer 6, after the stable gas pressure in cylinder 1, variometer 6 is by the value P of this stable air pressure
1be sent in single-chip microcomputer 7;
After b, closedown vent valve 5, open air compressor 3, extraneous air enters cylinder 1 by air compressor 3, thus the air pressure in cylinder 1 is increased; When the air pressure in cylinder 1 reaches certain atmospheric pressure value P
0, P
0=0.6MPa, closes gas admittance valve 4, and after the air pressure in cylinder 1 is again stable, variometer 6 is by the atmospheric pressure value P after again stable
2be sent in single-chip microcomputer 7;
C, open vent valve 5, the gas in cylinder 1 is entered in cereal container by pipeline, thus makes the air pressure in cylinder 1 and cereal container balance again, the atmospheric pressure value P after this balances by variometer 6
3be sent in single-chip microcomputer 7 unit;
D, described cylinder 1 volume are V
1, the volume of the pipeline between described gas admittance valve 4 and vent valve 5 is V
2, the volume of the pipeline between described cereal container and vent valve 5 is V
3, the volume of voids of described cereal is V
0, the porosity of cereal is ε, according to the Ideal-Gas Equation PV=MRT and porosity computing formula
then single-chip microcomputer 7 passes through formula:
Thus calculate the porosity of cereal, and the value of porosity is shown in touch-screen 8.
According to the Ideal-Gas Equation equation P V=MRT, following relational expression can be drawn:
P
1V
1′＝M
1RT (1), V
1′＝V
0+V
2(4)，
P
2V
2′＝M
2RT (2), V
2′＝V
1+V
3(5)，
P
3V
3′＝M
3RT (3), V
3′＝V
1′+V
2′ (6),
Wherein M
1quality for the gas of the pipeline between gas admittance valve 4 and vent valve 5 adds the quality of the gas in cereal hole; And M
2for the gaseous mass in cylinder 1 adds the gaseous mass of the pipeline between upper inlet valve 4 and vent valve 5; And M
3=M
1+ M
2(7).
Therefore by relational expression (1), (2), (3), (4), (5), (6), (7) and
the calculating formula obtaining cereal porosity is:
By substituting into measuring the data obtained the value that above-mentioned relation can obtain cereal porosity.
Above-mentioned embodiment is the preferred embodiments of the present invention, can not limit the present invention, and any of other does not deviate from technical scheme of the present invention and the substitute mode of the change made or other equivalence, is included within protection scope of the present invention.
Claims (6)
1. a cereal porosity measurement device, it is characterized in that: comprise air compressor, pipeline, gas admittance valve, cylinder, vent valve, cereal container, variometer and control display device, described cylinder is connected with air compressor and cereal container respectively by pipeline, described gas admittance valve is installed on the pipeline between air compressor and cylinder, and described vent valve is installed on the pipeline between cereal container and cylinder; Described variometer is installed on cylinder, and described variometer is connected with control display device; Described gas admittance valve and vent valve are all connected with control display device;
Described cereal container comprises main body for loading cereal and top pressure closure, and the top of described main body is provided with opening, and described top pressure closure is sealedly attached to the opening of main body;
Described control display device comprises touch-screen, the gentle valve control unit, VCU of single-chip microcomputer; Described touch-screen is connected with single-chip microcomputer, and described variometer is connected with single-chip microcomputer; Described gas admittance valve and vent valve are all connected with single-chip microcomputer by Air Valve Control unit.
2. a kind of cereal porosity measurement device according to claim 1, is characterized in that: described variometer is air pressure transmitter.
3. a kind of cereal porosity measurement device according to claim 1, it is characterized in that: described gas admittance valve is air inlet electromagnetic valve, described vent valve is exhaust solenoid valve.
4. a kind of cereal porosity measurement device according to claim 1, is characterized in that: the volume of described cylinder is equal with the volume of cereal container.
5. the measuring method of a kind of cereal porosity measurement device according to claim 4, other are characterised in that, comprise the steps:
A, after the main body of cereal container fills cereal, be tightly connected by the opening of top pressure closure and main body, now, gas admittance valve and vent valve are open mode; Detect the air pressure size in cylinder by variometer, after the stable gas pressure in cylinder, variometer is by the value P of this stable air pressure
1be sent in single-chip microcomputer;
After b, closedown vent valve, open air compressor, extraneous air enters cylinder by air compressor, thus the air pressure in cylinder is increased; When the air pressure in cylinder reaches certain atmospheric pressure value P
0after, close gas admittance valve, after the air pressure in cylinder is again stable, variometer is by the atmospheric pressure value P after again stable
2be sent in single-chip microcomputer;
C, open vent valve, the gas in cylinder is entered in cereal container by pipeline, thus makes the air pressure in cylinder and cereal container balance again, the atmospheric pressure value P after this balances by variometer
3be sent in single-chip microcomputer;
D, described volume of cylinder are V
1, the volume of the pipeline between described gas admittance valve and vent valve is V
2, the volume of the pipeline between described cereal container and vent valve is V
3, the volume of voids of described cereal is V
0, the porosity of cereal is ε, according to the Ideal-Gas Equation PV=MRT and porosity computing formula
then single-chip microcomputer passes through formula:
Calculate the porosity of cereal, and the value of porosity is shown in touch-screen.
6. the measuring method of a kind of cereal porosity measurement device according to claim 5, is characterized in that: described atmospheric pressure value P
0size be 0.5 ~ 0.6MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310158965.9A CN103335927B (en) | 2013-05-02 | 2013-05-02 | A kind of cereal porosity measurement device and measuring method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310158965.9A CN103335927B (en) | 2013-05-02 | 2013-05-02 | A kind of cereal porosity measurement device and measuring method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103335927A CN103335927A (en) | 2013-10-02 |
| CN103335927B true CN103335927B (en) | 2015-07-29 |
Family
ID=49244135
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310158965.9A Expired - Fee Related CN103335927B (en) | 2013-05-02 | 2013-05-02 | A kind of cereal porosity measurement device and measuring method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103335927B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105181558B (en) * | 2015-11-02 | 2017-09-26 | 太原理工大学 | The test device and method of testing of deposit porosity |
| CN106198351B (en) * | 2016-08-04 | 2023-10-20 | 北京邮电大学 | Cereal seepage coefficient testing device and method |
| CN108458945B (en) * | 2018-06-27 | 2023-11-17 | 吉林大学 | Porous material porosity measuring device and control method thereof |
| CN110736584B (en) * | 2019-10-29 | 2021-01-29 | 合肥工业大学 | Device and method for measuring vacuum degree in hollow glass beads |
| CN113804581B (en) * | 2021-09-27 | 2023-06-02 | 同济大学 | Method and system for testing stacking rate of block stones by using exhaust method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201193948Y (en) * | 2008-04-18 | 2009-02-11 | 国家粮食局科学研究院 | Grain storage situation monitoring system for barn |
-
2013
- 2013-05-02 CN CN201310158965.9A patent/CN103335927B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201193948Y (en) * | 2008-04-18 | 2009-02-11 | 国家粮食局科学研究院 | Grain storage situation monitoring system for barn |
Non-Patent Citations (3)
| Title |
|---|
| "质量容积"代替"容重"评价粮油品质的探讨;何学超等;《粮油仓储科技通讯》;20021231;第46，48页 * |
| 散粒物料孔隙率测定装置的研制;张淑珍等;《农业工程学报》;19960331;第12卷(第1期);第188-189页 * |
| 粮食孔隙率测定方法探讨;田晓红等;《粮食加工》;20091231;第34卷(第5期);第35页"测定原理"部分至第36页"结果分析"部分 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103335927A (en) | 2013-10-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103335927B (en) | A kind of cereal porosity measurement device and measuring method thereof | |
| CN106198297B (en) | A method of accurately calculating methane true adsorbance on shale | |
| CN104713803A (en) | Method for accurately measuring absorbed phase density of methane on shale | |
| CN103226089B (en) | Method for testing shale gas permeability | |
| CN103335916A (en) | Experiment device for initial laws of tectonic coal gas desorption | |
| CN102680999B (en) | Automatic temperature/humidity compensation method of electrostatic collecting radon detection efficiency | |
| CN105043927B (en) | It is a kind of can accurate pressure control gas absorption analysis method and device | |
| CN202939322U (en) | Device for calibrating humidity dynamic response characteristics of sonde with double-flow method | |
| CN104535455A (en) | Gas seepage experiment device and method for dynamically monitoring pore pressure distribution and changes | |
| CN112485175B (en) | Rock porosity measuring method and measuring device | |
| CN102706778B (en) | Measuring device of effective diffusion coefficient of weak adsorption gas in bulk nano-porous material under low pressure | |
| CN108020384B (en) | Sintering machine ontology inleakage equivalent detecting method based on fluid energy conservation | |
| CN206058014U (en) | A kind of humiture self-checking device of emanometer radon gas sampling | |
| CN201778806U (en) | Full-automatic multifunctional isothermal line adsorption and desorption and pollution evaluation experimental instrument | |
| CN104007041A (en) | Device for determining content of hydrogen sulfide in coal bed | |
| CN106018734B (en) | Method for determining reasonable infiltration time of coal seam water injection | |
| CN101566547B (en) | Buoyancy method for rapidly measuring grain moisture and tester thereof | |
| CN113624654B (en) | Rock porosity measuring device and method | |
| CN203241324U (en) | Shale gas permeability determinator | |
| CN210037446U (en) | Device for testing influence of grain internal temperature and humidity on compression characteristic | |
| CN206594002U (en) | A kind of hydrogen storage material, which is inhaled, puts hydrogen PCT curve testing devices | |
| CN105974085A (en) | Portable and intelligent rapid gas content tester | |
| CN113776986B (en) | Device and method for measuring apparent density of stacking | |
| CN103776723B (en) | A kind of assay method of gases at high pressure adsorption isothermal and the device of enforcement the method | |
| CN203929719U (en) | Coal seam hydrogen sulfide content determinator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150729 |