CN1186599C - Method for continuously measuring flow of bulk material by ultrahigh frequency resonant cavity - Google Patents
Method for continuously measuring flow of bulk material by ultrahigh frequency resonant cavity Download PDFInfo
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- CN1186599C CN1186599C CNB021250715A CN02125071A CN1186599C CN 1186599 C CN1186599 C CN 1186599C CN B021250715 A CNB021250715 A CN B021250715A CN 02125071 A CN02125071 A CN 02125071A CN 1186599 C CN1186599 C CN 1186599C
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- Prior art keywords
- resonator cavity
- bulk material
- frequency
- medium tube
- resonant cavity
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000013590 bulk material Substances 0.000 title claims description 28
- 239000002184 metal Substances 0.000 claims abstract description 19
- 229910052751 metal Inorganic materials 0.000 claims abstract description 19
- 238000005259 measurement Methods 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 11
- 238000012545 processing Methods 0.000 claims abstract description 4
- 238000005070 sampling Methods 0.000 claims abstract description 4
- 241000208125 Nicotiana Species 0.000 claims description 15
- 235000002637 Nicotiana tabacum Nutrition 0.000 claims description 15
- 230000010363 phase shift Effects 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 7
- 238000005516 engineering process Methods 0.000 abstract description 4
- 230000005855 radiation Effects 0.000 abstract description 4
- 238000012423 maintenance Methods 0.000 abstract description 3
- 239000011797 cavity material Substances 0.000 description 37
- 230000005672 electromagnetic field Effects 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000005624 perturbation theories Effects 0.000 description 1
- 238000007363 ring formation reaction Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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- Manufacturing Of Cigar And Cigarette Tobacco (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The invention relates to an application of microwave technology to an electronic scale, in particular to a method for continuously measuring the flow of a loose material (medium) by using an ultrahigh frequency resonant cavity. A hollow medium pipe is arranged in a cylindrical metal resonant cavity with a hole in the middle, a speed sensor is arranged outside the medium pipe, frequency deviation delta f of the resonant cavity is measured in advance when different materials, different filling densities and different water contents exist, a list is stored in a computer, a calibration and calibration process is completed, loose materials continuously flow through the hollow medium pipe, the frequency deviation delta f when the materials flow through the resonant cavity is read out from the computer at the sampling moment, and the weight of the loose materials in the medium pipe at the moment is known after processing such as table lookup. The method has the advantages of good measurement stability, easy adjustment, no maintenance, no nuclear radiation and high measurement precision (better than five thousandths).
Description
Affiliated technical field
The present invention is the application of microwave technology on electronic scales, the method that specifically to be a kind of use ultrahigh frequency resonator cavity carry out continuous coverage to the flow of bulk material (medium).
Background technology
At present, the measurement to pipe tobacco or offal flow generally all is to adopt electronic scales to carry out on the production of cigarettes.This method measurement stability is poor, it is big to be difficult for adjustment, maintenance and maintenance load.Recently, reported the method for two kinds of continuous coverage bulk material flows again: uclear scale method and publication number are the described method of Chinese patent file of CN118534A.The major defect of uclear scale method is that micro-nuclear radiation is arranged.The described method of CN118534A is divided into main channel and secondary channels with material, measures weight of material with lever scale on secondary channels, is a kind of contact type measurement, because the deviation between sample and the parent exists in measurement all the time, has reduced the precision of measuring.
Summary of the invention
The objective of the invention is to overcome the weakness of prior art, a kind of no nuclear radiation is provided, the heed contacted measure method that measurement stability is good, precision is high is promptly used the method for ultrahigh frequency resonator cavity continuous coverage bulk material (medium) flow.
By Theory of Electromagnetic Field as can be known, TM in the cylindrical metal resonator cavity 1 shown in Figure 1
MnpThe field distribution and the resonance frequency of mould are respectively
E
z=2E
0J
m(k
cr)cos?mcos?βze?
jωt
H
z=0
In the following formula: x
MnBe m rank Bessel's function J
m(x) n root; M, n and p are respectively the half-wave number of electromagnetic field along cylindrical coordinate φ, r and the variation of z axle; f
MnpResonance frequency for the cylindrical metal resonator cavity; μ
rRelative permeability for medium in the chamber; ε
rRelative dielectric constant for medium in the chamber; L is the height of cylindrical metal resonator cavity; A is the radius of cylindrical metal resonator cavity.Select the main mould pattern TM of cylindrical metal resonator cavity
010, can meet design requirement.
If on wire chamber shown in Figure 1, open hole, a garden, insert medium tube in the hole, garden, and in medium tube, put into bulk material, as pipe tobacco or offal.Because the bulk material in the medium tube is the potpourri of water, clearance and pipe tobacco or offal, the bulk material equivalent relative dielectric constant is ε
r, and
ε in the following formula
R1, ε
R2And ε
R3Be respectively the relative dielectric constant of water, clearance and pipe tobacco or offal; α
1, α
2And α
3Be respectively the percent by volume of water, clearance and pipe tobacco or offal.
Theoretical analysis shows: the main mould TM of cylindrical metal resonator cavity 1
010Resonance frequency be
C is the light velocity in the following formula; A is the radius of cylindrical metal resonator cavity.If on the cylindrical metal resonator cavity, open hole, a garden, and in the hole, garden, insert the medium tube of filling full bulk material (as pipe tobacco or offal), see shown in Figure 2.Perturbation theory by resonator cavity is known, compares with empty resonator cavity, and this moment, the resonance frequency of resonator cavity was changed to Δ f,
And
Δ v is the volume of interior medium tube of cylindrical metal resonator cavity and bulk material in the following formula; Electromagnetic field after the perturbation in the resonator cavity is E and H, and specific inductive capacity in the resonator cavity and magnetic permeability variation are respectively Δ ε and Δ μ; The volume of remaining space is v in the resonator cavity; Electromagnetic field before the perturbation in the resonator cavity is E
0 *And H
0 *, specific inductive capacity and magnetic permeability in the resonator cavity are respectively ε and μ.Be resonance frequency the f (=f of cylindrical metal resonator cavity
0+ Δ f) with bulk material equivalent relative dielectric constant ε in the chamber
rIncrease and reduce.
Experimental result is as follows: under experiment condition shown in Figure 2, the radio frequency network analyser 8712ET measurement result of producing with U.S. Agilent company shows, during the empty medium tube of insertion in the hole, wire chamber garden in, and the resonance frequency f of cylindrical metal resonator cavity
o=250Mhz; (the pipe tobacco volume accounts for medium tube inner volume about 60% to fill bulk material in the medium tube, the clearance volume is about 40%, pipe tobacco water cut 12%) after, the resonator cavity resonance frequency is f=244Mhz, be that resonator cavity resonance frequency variation (Δ f) scope equals 6Mhz, experimental result is seen shown in Figure 3; When the pipe tobacco volume accounted for the medium tube inner volume than variation or pipe tobacco change of moisture content, the resonator cavity resonance frequency also changed.Be the variation of the variation of bulk material and composition ratio and water cut corresponding to resonator cavity resonance frequency f, consistent with notional result.
On the other hand, when the given volume of bulk material, through proving the percent by volume of the weight of bulk material behind the experiment measuring corresponding to bulk material, water and air gap.So the variation of cylindrical metal resonator cavity/resonance frequency f corresponding to the weight change of bulk material, promptly can be used for measuring the weight of bulk material after the calibration calibration.Increase a real-time continuous again and measure the speed pickup of bulk material flow velocity, get final product the flow of continuous coverage bulk material (medium).The calibration calibration process is as follows: when static, the frequency deviation Δ f of resonator cavity measures during to different pipe tobaccos or offal, different packed density and different moisture content, and tabulation deposits computing machine in, finishes the calibration calibration process; During successive dynamic measuring,, after processing such as table look-up, promptly know the weight of pipe tobacco in this moment medium tube or offal at the frequency deviation Δ f of the resonance frequency of sampling when constantly computing machine is read streams through resonator cavity from the RS-232 mouth.
The inventive method is as follows:
1, in the cylindrical metal resonator cavity of middle perforate a hollow medium tube is set, medium tube peripheral hardware speed sensor,
The frequency deviation Δ f of resonator cavity measures during 2, in advance to different material, different packed density and different moisture content, and tabulation deposits computing machine in, finishes the calibration calibration process;
3, make the bulk material continuous stream cross the hollow medium tube, the frequency deviation Δ f when sampling is constantly read streams through resonator cavity from computing machine promptly knows the weight of bulk material in this moment medium tube after processing such as table look-up.
According to top method, this professional those of ordinary skill just can be implemented the technology of the present invention, realizes goal of the invention.
Advantage of the present invention:
Compare good, the easy adjustment of measurement stability of the present invention, non-maintaining with electronic scales;
Compare with uclear scale, the present invention does not have nuclear radiation;
With publication number be the method introduced of the patent of invention of CN118534A relatively, the present invention is a kind of heed contacted measure, good, the easy adjustment of measurement stability, non-maintaining, measuring accuracy height (being better than 5/1000ths).
Description of drawings
Fig. 1 is cylindrical metal resonator cavity and coordinate system thereof.
Fig. 2 is provided with the cylindrical metal resonator cavity of a hollow medium tube in being.
Fig. 3 is the measurement result under experiment condition shown in Figure 2
Apparatus structure synoptic diagram among Fig. 4 embodiment.
Circuit block diagram among Fig. 5 embodiment.
Embodiment
Seeing Figure 4 and 5, is the method embodiment of a usefulness ultrahigh frequency resonator cavity continuous coverage pipe tobacco or offal flow.The height of cylindrical metal resonator cavity 3 is 200mm, and radius is 450mm, and material is a stainless steel.The length of hollow medium tube 4 is 900mm, and internal diameter is 140mm, and wall thickness is 10mm, and material is a pvc pipe.Speed pickup 5 is the microwave Doppler speed pickup.Magnetic couple cyclization 6 is the round ring of radius 50mm, is the copper cash coiling of 3mm with diameter.The flow direction of pipe tobacco or offal when Fig. 4 hollow core arrow is represented to measure.
Among this embodiment, the ultrahigh frequency resonant circuit contains the ultrahigh frequency resonator cavity, high performance filter, amplifier, automatic gain controller and automatic phase-shift controller.
Above embodiment only is described further invention, and scope of the present invention is not subjected to the limitation of illustrated embodiment.
Claims (6)
1, a kind of method of ultrahigh frequency resonator cavity continuous coverage bulk material flow, it is characterized in that employed device comprises that the ultrahigh frequency resonant circuit that contains the ultrahigh frequency resonator cavity, intelligent frequency meter, real-time continuous measure the speed pickup and the computing machine of the flow velocity of bulk material, the cylindrical metal resonator cavity that said ultrahigh frequency resonator cavity is middle perforate, one hollow medium tube is set in this cylindrical metal resonator cavity, said speed pickup is arranged on outside this medium tube, and this method comprises following step:
The frequency deviation Δ f of resonator cavity measures during (1) in advance to different material, different packed density and different moisture content, and tabulation deposits computing machine in, finishes the calibration calibration process,
(2) make the bulk material continuous stream cross the hollow medium tube, the frequency deviation Δ f when sampling is constantly read streams through resonator cavity from computing machine learns the weight of bulk material in this moment medium tube after data processing,
(3) flow that calculates bulk material according to the flow velocity and the described weight of speed pickup measurement.
2,, it is characterized in that said bulk material is pipe tobacco or offal as the said method of claim 1.
3,, it is characterized in that reading the frequency deviation Δ f of the resonance frequency of streams when the resonator cavity from computing machine RS-232 mouth as the said method of claim 1.
4,, it is characterized in that speed pickup is the microwave Doppler speed pickup as the said method of claim 1.
5,, it is characterized in that said ultrahigh frequency resonant circuit also comprises high performance filter, amplifier, automatic gain controller and automatic phase-shift controller as the said method of claim 1.
6,, it is characterized in that the hollow medium tube is a pvc pipe as the said method of claim 1.
Priority Applications (1)
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CNB021250715A CN1186599C (en) | 2002-07-09 | 2002-07-09 | Method for continuously measuring flow of bulk material by ultrahigh frequency resonant cavity |
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CNB021250715A CN1186599C (en) | 2002-07-09 | 2002-07-09 | Method for continuously measuring flow of bulk material by ultrahigh frequency resonant cavity |
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CN1391087A CN1391087A (en) | 2003-01-15 |
CN1186599C true CN1186599C (en) | 2005-01-26 |
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Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10350224B4 (en) * | 2003-10-27 | 2007-07-26 | Sartorius Ag | Method for determining moisture and density of a dielectric material |
CN1995997B (en) * | 2005-12-31 | 2010-06-30 | 云南大学 | Microwave spectrum method for monitoring chemical reaction dynamic process |
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2002
- 2002-07-09 CN CNB021250715A patent/CN1186599C/en not_active Expired - Fee Related
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