CN108169250B - Intelligent variable-frequency microwave moisture measuring instrument and measuring method - Google Patents
Intelligent variable-frequency microwave moisture measuring instrument and measuring method Download PDFInfo
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- CN108169250B CN108169250B CN201810172101.5A CN201810172101A CN108169250B CN 108169250 B CN108169250 B CN 108169250B CN 201810172101 A CN201810172101 A CN 201810172101A CN 108169250 B CN108169250 B CN 108169250B
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- 238000000034 method Methods 0.000 title claims description 16
- 239000000463 material Substances 0.000 claims abstract description 93
- 238000001514 detection method Methods 0.000 claims abstract description 15
- 238000004891 communication Methods 0.000 claims abstract description 11
- 238000005259 measurement Methods 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 20
- 238000012545 processing Methods 0.000 claims description 9
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 238000001228 spectrum Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 229920006395 saturated elastomer Polymers 0.000 claims description 3
- 230000003068 static effect Effects 0.000 claims description 3
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- 239000000523 sample Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- 238000005265 energy consumption Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N22/00—Investigating or analysing materials by the use of microwaves or radio waves, i.e. electromagnetic waves with a wavelength of one millimetre or more
- G01N22/04—Investigating moisture content
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Abstract
The invention relates to the field of material moisture detection, in particular to an intelligent variable-frequency microwave moisture measuring instrument, which comprises a detection device and a control device, wherein the detection device comprises a C-shaped frame, shielding boxes arranged on an upper arm and a lower arm of the C-shaped frame, an upper antenna and a lower antenna arranged in the shielding boxes, a microwave unit arranged in the shielding boxes of the lower arms, and a belt scale arranged on a detection material conveying belt; the control device comprises a control cabinet arranged on the left side of the C-shaped frame, an embedded industrial personal computer, a PLC controller and a touch screen which are arranged in the control cabinet and are in communication connection; the microwave unit is in communication connection with the embedded industrial personal computer and the PLC, and the belt scale is connected with the PLC. The invention has ingenious design, can select the optimal microwave frequency according to different materials, avoids the condition that the materials with high density, large thickness and large humidity are difficult to penetrate, can adapt to harsh industrial field environment, is not easy to influence the measurement, does not contain radioactive sources, is simple to maintain and has potential market value.
Description
Technical Field
The invention relates to the field of material moisture detection, in particular to an intelligent variable-frequency microwave moisture measuring instrument and a measuring method.
Background
The moisture content of the substances is an important parameter in industrial production, has important influence on the production process, and is easy to cause the rise of rejection rate, the increase of energy consumption, environmental pollution and the like due to inaccurate measurement control. Current methods for measuring moisture: 1. the laboratory manual analysis has high accuracy and long time delay, and the moisture change can not be mastered in real time. 2. The infrared water meter is affected by dust, water vapor and material color and only measures surface moisture. 3. The electric conduction water meter has the advantages that the contact material probe is large in abrasion, and the material is easy to adhere to the probe. 4. The neutron water meter and the radioactive source are difficult to maintain and manage. 5. The microwave water meter is divided into a transmission type and a reflection type, the reflection type has higher manufacturing cost, and the transmission type is often influenced by the type and the thickness of materials due to the different penetrating capacities of microwaves with different frequencies to the materials, so that the detection result is deviated.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects existing in the prior art and provides an intelligent variable-frequency microwave moisture measuring instrument and a measuring method.
The technical scheme of the invention is as follows: the intelligent variable-frequency microwave moisture measuring instrument comprises a detection device and a control device, wherein the detection device comprises a C-shaped frame, shielding boxes arranged on an upper arm and a lower arm of the C-shaped frame, an upper antenna and a lower antenna which are arranged in the shielding boxes, a microwave unit arranged in the shielding boxes of the lower arm, and a belt scale arranged on a detection material conveying belt, wherein the upper antenna and the lower antenna are connected with the microwave unit through coaxial cables; the control device comprises a control cabinet arranged on the left side of the C-shaped frame, an embedded industrial personal computer, a PLC (programmable logic controller) and a touch screen which are arranged in the control cabinet and are in communication connection, and a power supply for providing electric quantity for the embedded industrial personal computer, the PLC and the touch screen; the microwave unit is in communication connection with the embedded industrial personal computer and the PLC, and the belt scale is connected with the PLC.
Further, the upper and lower antennas are ultra-wideband microwave directional antennas.
Further, the microwave unit comprises a variable frequency microwave source.
Furthermore, the microwave unit is in communication connection with the Ethernet of the embedded industrial personal computer.
Further, a rectangular opening is formed in the surface of the control cabinet, and the touch screen is located on the opening.
Further, the method for measuring the moisture of the intelligent variable-frequency microwave moisture measuring instrument comprises the following steps: (1) Selecting the optimal microwave frequency, establishing a microwave attenuation model of material quality and moisture content, and storing related data into an embedded industrial personal computer; (2) the material to be measured is conveyed by a conveyor belt; (3) selecting a material to be tested on the touch screen; (4) The PLC controller is used for calling the optimal microwave frequency of the material to be tested from the embedded industrial personal computer, controlling a variable frequency microwave source in the microwave unit to generate the optimal microwave frequency and sending the optimal microwave frequency by the lower antenna; (5) Microwave signals passing through the conveyor belt and the materials are received by the upper antenna and are retransmitted to the microwave unit, and the microwave unit finishes the phase and amplitude processing of the microwave signals; (6) The microwave unit transmits the front and rear information of microwaves passing through the conveying belt and materials to the embedded industrial personal computer through the Ethernet; (7) The belt scale on the material conveying belt transmits the material weight information to the PLC controller, and the PLC controller transmits the material weight information to the embedded industrial personal computer; (8) The embedded industrial personal computer software obtains the microwave attenuation caused by the material moisture through penetrating the conveying belt, the microwave attenuation before and after the material, the material type and the mass attenuation and the empty band attenuation, and further calculates the material moisture content and displays the material moisture content through the touch screen.
Further, the step (1) of the method for measuring moisture of the intelligent variable frequency microwave moisture measuring instrument comprises the following steps: i, obtaining a material sample, drying until the moisture is zero, and equally split charging the material sample into a plurality of equal parts for standby after cooling; II, placing a plurality of material samples on a stationary conveyor belt, adding water, controlling a variable frequency microwave source in a microwave unit to generate microwaves with a certain frequency by a touch screen control PLC (programmable logic controller) to perform frequency spectrum scanning, gradually increasing the water adding amount, repeatedly scanning for a plurality of times, and selecting the optimal microwave frequency from the frequency spectrum formed by scanning; placing the material samples on a static conveyor belt one by one, accumulating gradually at the original placing position, controlling a variable frequency microwave source of a microwave unit to generate optimal microwave frequency by a PLC (programmable logic controller) controller, sending out by a lower antenna, receiving by an upper antenna, scanning the optimal microwave frequency once, processing a scanning result by the microwave unit, transmitting the scanning result to an embedded industrial personal computer, and automatically recording the microwave phase and amplitude attenuation change condition by the software of the embedded industrial personal computer until all the samples are placed; IV, after all samples are placed, gradually increasing water content of 0.5% of the mass of the samples in the samples, controlling a variable frequency microwave source of a microwave unit to generate optimal microwave frequency by a PLC (programmable logic controller) after each increase, sending out by a lower antenna, receiving by an upper antenna, scanning the optimal microwave frequency once, processing a scanning result by the microwave unit, transmitting the scanning result to an embedded industrial personal computer, and automatically recording amplitude and phase changes by software of the embedded industrial personal computer until the increase water amount is 1.5 times of the saturated water amount of all the samples; and V, establishing a microwave attenuation model of the material quality and the moisture content by embedded industrial personal computer software.
According to the intelligent variable-frequency microwave moisture measuring instrument, according to the different penetrating capacities of microwaves with different frequencies on substances, the optimal microwave frequency is selected for scanning different materials, and the influence of the quality of the materials, namely the thickness of the materials, on the measuring result is comprehensively considered, so that the measuring result of the moisture content of the materials is more accurate. Has potential market value.
Drawings
The invention is further described below with reference to the drawings and examples.
FIG. 1 is a schematic diagram of an intelligent variable frequency microwave moisture meter according to the present disclosure;
FIG. 2 is a schematic diagram of an intelligent variable frequency microwave moisture meter according to the present disclosure;
fig. 3 is a diagram of an installation position of the intelligent variable frequency microwave moisture measuring instrument disclosed by the invention.
Detailed Description
The invention relates to an intelligent variable-frequency microwave moisture measuring instrument and a measuring method thereof, which are described in detail below with reference to the accompanying drawings and embodiments.
As shown in fig. 1 and 3, an intelligent variable frequency microwave moisture measuring instrument comprises a detection device and a control device, wherein the detection device comprises a C-shaped frame 1, shielding boxes 13 and 14 arranged on upper and lower arms 11 and 12 of the C-shaped frame 1, upper and lower antennas 15 and 16 arranged in the shielding boxes 13 and 14 and a microwave unit 17 arranged in the shielding box 14 of the lower arm, the upper and lower antennas 15 and 16 are connected with the microwave unit 17 through coaxial cables 18, and the intelligent variable frequency microwave moisture measuring instrument further comprises a belt scale 2 arranged on a detection material conveying belt; the control device comprises a control cabinet 3 arranged on the left side of the C-shaped frame 1, an embedded industrial personal computer 31, a PLC 32 and a touch screen 33 which are arranged in the control cabinet 3 and are in communication connection, and a power supply 34 for providing electric quantity for the embedded industrial personal computer 31, the PLC 32 and the touch screen 33; the microwave unit 17 is in communication connection with the embedded industrial personal computer 31 and the PLC 32, and the belt scale 2 is connected with the PLC 32. The upper and lower antennas 15, 16 are ultra wideband microwave directional antennas. The microwave unit 17 comprises a variable frequency microwave source. The microwave unit 17 is connected with the embedded industrial personal computer 31 in an ethernet communication manner. The surface of the control cabinet 3 is provided with a rectangular opening, and the touch screen 33 is positioned on the opening 32.
As shown in fig. 2, the moisture measuring method of the intelligent variable frequency microwave moisture measuring instrument comprises the following steps: (1) Selecting the optimal microwave frequency, establishing a microwave attenuation model of material quality and moisture content, and storing related data into an embedded industrial personal computer; the method specifically comprises the following steps:
I, obtaining a material sample, drying until the moisture is zero, and equally split charging the material sample into a plurality of equal parts for standby after cooling; II, placing a plurality of material samples on a stationary conveyor belt, adding a proper amount of water, controlling a PLC (programmable logic controller) 32 by a touch screen 33, further controlling a variable frequency microwave source in a microwave unit 17 to generate microwaves with a certain frequency for spectrum scanning, gradually increasing the water adding amount, repeatedly scanning for a plurality of times, and selecting the optimal microwave frequency from the frequency spectrum formed by scanning; and III, placing the material samples on a static conveyor belt one by one, accumulating the material samples in the original placing position one by one, controlling a PLC (programmable logic controller) 32 by a touch screen 33, further controlling a variable frequency microwave source of a microwave unit 17 to generate optimal microwave frequency, sending the optimal microwave frequency by a lower antenna 16, receiving the optimal microwave frequency by an upper antenna 15, carrying out one-time scanning, processing the scanning result by the microwave unit 17, transmitting the scanning result to an embedded industrial personal computer 31, and automatically recording the microwave phase and amplitude attenuation change condition by software of the embedded industrial personal computer 31 until all the samples are placed. And IV, after all samples are placed, gradually increasing the water content of 0.5% of the mass of the samples in the samples, controlling the PLC 32 by the touch screen 33 after each increase, further controlling the variable frequency microwave source of the microwave unit 17 to generate optimal microwave frequency, sending out by the lower antenna 16, receiving by the upper antenna 15, performing one-time optimal microwave frequency scanning, processing the scanning result by the microwave unit 17, transmitting to the embedded industrial personal computer 31, and automatically recording amplitude and phase changes by the software of the embedded industrial personal computer 31 until the water content is increased by 1.5 times of the saturated water content of all the samples. And V, establishing a microwave attenuation model of the material quality and the moisture content by using software of the embedded industrial personal computer 31.
(2) The material to be measured is conveyed by a conveying belt; (3) selecting a material to be tested on the touch screen 33; (4) The PLC 32 is used for calling the optimal microwave frequency information of the material to be tested from the embedded industrial personal computer 31, controlling a variable frequency microwave source in the microwave unit 17 to generate optimal microwave frequency and sending the optimal microwave frequency by the lower antenna 16; (5) Microwave signals passing through the conveyor belt and the materials are received by the upper antenna 15 and retransmitted to the microwave unit 17, and the microwave unit 17 finishes the phase and amplitude processing of the microwave signals; (6) The microwave unit 17 transmits the front and rear information of microwaves passing through the conveyor belt and materials to the embedded industrial personal computer 31 through the Ethernet; (7) The belt scale 2 on the material conveying belt transmits the material quality information to the PLC 32, and the PLC 32 transmits the material quality information to the embedded industrial personal computer 31; (8) The embedded industrial personal computer 31 calculates microwave attenuation caused by material moisture in software through microwave attenuation, material type and mass attenuation and empty band attenuation before and after penetrating the conveyor belt and the material, and further calculates the material moisture content, and the material moisture content is displayed through the touch screen 33.
When the invention is used, the C-shaped frame 1 is directly arranged on a longitudinal beam of a conveyor belt or on an independent structure, is firm and durable, and ensures the precise alignment of the shielding boxes 13 and 14 on the upper arm 11 and the lower arm 12. In the C-frame 1, the primary moisture measuring elements are upper and lower antennas 15, 16 which are held in precise alignment with the center of the material on the belt to ensure that the microwave beam passes through the material along the center line. Because the optimal microwave scanning frequency is determined for different materials in advance, and the basic information such as the microwave attenuation model of the material quality and the moisture content is determined, the basic information is stored in the software of the embedded industrial personal computer 31. During measurement, the material to be measured is selected through the touch screen 33, the touch screen 33 transmits information to the PLC 32, the PLC 32 invokes the optimal microwave frequency information corresponding to the material from the embedded industrial personal computer 31, and the microwave unit 17 is controlled to scan the optimal microwave frequency of the material to be measured. The microwave information before and after scanning is processed by the microwave unit 17 and then transmitted to the embedded industrial personal computer 31 software, meanwhile, the material quality information of the conveying belt is also transmitted to the PLC 32 after being measured by the belt scale 2, the PLC 32 transmits the material quality information to the embedded industrial personal computer 31 software, and as the microwave attenuation model of the material quality and the moisture content is stored in the embedded industrial personal computer 31 software in advance, the material type is mainly the basic information such as the microwave attenuation caused by the dielectric constant of the material, the blank attenuation and the like, the embedded industrial personal computer 31 software can calculate the microwave attenuation caused by the moisture content of the material according to the microwave attenuation before and after penetrating the conveying belt and the material, the microwave attenuation caused by the material quality, the attenuation caused by the blank attenuation, and calculate the moisture content of the material through the microwave attenuation model of the moisture content, and display the touch screen 33. The attenuation caused by the mass of the material is essentially the attenuation caused by the thickness of the material in the case of a certain width of the conveyor belt.
The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made in accordance with the essence of the present invention are intended to be included within the scope of the present invention.
Claims (3)
1. The utility model provides a method of intelligent frequency conversion microwave moisture measuring apparatu measurement moisture, intelligent frequency conversion microwave moisture measuring apparatu includes detection device and controlling means, its characterized in that:
The detection device comprises a C-shaped frame, shielding boxes arranged on an upper arm and a lower arm of the C-shaped frame, an upper antenna and a lower antenna which are arranged in the shielding boxes, a microwave unit arranged in the lower arm shielding boxes, and a belt scale arranged on a detection material conveying belt, wherein the upper antenna and the lower antenna are connected with the microwave unit through coaxial cables;
the control device comprises a control cabinet arranged on the left side of the C-shaped frame, an embedded industrial personal computer, a PLC (programmable logic controller) and a touch screen which are arranged in the control cabinet and are in communication connection, and a power supply for providing electric quantity for the embedded industrial personal computer, the PLC and the touch screen;
the microwave unit is in communication connection with the embedded industrial personal computer and the PLC, and the belt scale is connected with the PLC; the microwave unit comprises a variable frequency microwave source; the microwave unit is in Ethernet communication connection with the embedded industrial personal computer;
the method for measuring moisture comprises the following steps:
(1) Selecting the optimal microwave frequency, establishing a microwave attenuation model of material quality and moisture content, and storing related data into an embedded industrial personal computer;
(2) The material to be measured is conveyed by a conveying belt;
(3) Selecting a material to be detected on the touch screen;
(4) The PLC controller is used for calling the optimal microwave frequency of the material to be tested from the embedded industrial personal computer, controlling a variable frequency microwave source in the microwave unit to generate the optimal microwave frequency and sending the optimal microwave frequency by the lower antenna;
(5) Microwave signals passing through the conveyor belt and the materials are received by the upper antenna and are retransmitted to the microwave unit, and the microwave unit finishes the phase and amplitude processing of the microwave signals;
(6) The microwave unit transmits the front and rear information of microwaves passing through the conveying belt and materials to the embedded industrial personal computer through the Ethernet;
(7) The belt scale on the material conveying belt transmits the material weight information to the PLC controller, and the PLC controller transmits the material weight information to the embedded industrial personal computer;
(8) The embedded industrial personal computer software obtains microwave attenuation caused by material moisture through penetrating a conveyor belt, microwave attenuation before and after materials, material type and mass attenuation and blank band attenuation, and further calculates the material moisture content, and the material moisture content is displayed through a touch screen;
the step (1) comprises:
I, obtaining a material sample, drying until the moisture is zero, and equally split charging the material sample into a plurality of equal parts for standby after cooling;
II, placing a plurality of material samples on a stationary conveyor belt, adding water, controlling a variable frequency microwave source in a microwave unit to generate microwaves with a certain frequency by a touch screen control PLC (programmable logic controller) to perform frequency spectrum scanning, gradually increasing the water adding amount, repeatedly scanning for a plurality of times, and selecting the optimal microwave frequency from the frequency spectrum formed by scanning;
Placing the material samples on a static conveyor belt one by one, accumulating gradually at the original placing position, controlling a variable frequency microwave source of a microwave unit to generate optimal microwave frequency by a touch screen control PLC (programmable logic controller), sending out by a lower antenna, receiving by an upper antenna, scanning the optimal microwave frequency once, processing a scanning result by the microwave unit, transmitting the scanning result to an embedded industrial personal computer, and automatically recording the microwave phase and amplitude attenuation change condition by the embedded industrial personal computer software until all the samples are placed;
IV, after all samples are placed, gradually increasing water content of 0.5% of the mass of the samples in the samples, controlling a variable frequency microwave source of a microwave unit to generate optimal microwave frequency by a touch screen control PLC (programmable logic controller), sending out by a lower antenna, receiving by an upper antenna, scanning the optimal microwave frequency once, processing a scanning result by the microwave unit, transmitting the scanning result to an embedded industrial personal computer, and automatically recording amplitude and phase changes by software of the embedded industrial personal computer until the water content is 1.5 times of the saturated water content of all the samples;
And V, establishing a microwave attenuation model of the material quality and the moisture content by embedded industrial personal computer software.
2. The method for measuring moisture by using the intelligent variable frequency microwave moisture meter according to claim 1, wherein the method comprises the following steps: the upper antenna and the lower antenna are ultra-wideband microwave directional antennas.
3. The method for measuring moisture by using the intelligent variable frequency microwave moisture meter according to claim 1, wherein the method comprises the following steps: the surface of the control cabinet is provided with a rectangular opening, and the touch screen is positioned on the opening.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109904590B (en) * | 2019-01-23 | 2020-04-17 | 浙江大学 | Microwave antenna automatic alignment device applied to grain moisture content detection system |
| CN112903722B (en) * | 2019-12-04 | 2022-11-01 | 中联重科股份有限公司 | Detection method and detection system for water content of sandstone aggregate and concrete production equipment |
| CN111812122B (en) * | 2020-06-15 | 2021-08-03 | 浙江大学 | Second-order frequency selection method and device for microwave frequency sweep data |
| CN114486943A (en) * | 2022-01-28 | 2022-05-13 | 青岛众志测控技术有限公司 | Intelligent frequency-selecting microwave moisture measuring instrument |
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| AU2002951784A0 (en) * | 2002-09-26 | 2002-10-17 | Callidan Instruments Pty Ltd | Moisture analyser |
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| US5397993A (en) * | 1990-02-10 | 1995-03-14 | Tews; Manfred | Method for measuring the material moisture content of a material under test using microwaves |
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