CN106441503A - High-frequency traveling wave reflecting type material level switch - Google Patents
High-frequency traveling wave reflecting type material level switch Download PDFInfo
- Publication number
- CN106441503A CN106441503A CN201610864444.9A CN201610864444A CN106441503A CN 106441503 A CN106441503 A CN 106441503A CN 201610864444 A CN201610864444 A CN 201610864444A CN 106441503 A CN106441503 A CN 106441503A
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- CN
- China
- Prior art keywords
- feeler lever
- inner core
- probe
- level switch
- traveling wave
- 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.)
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The invention discloses a high-frequency traveling wave reflecting type material level switch which comprises an electric transducing unit and a feeler lever assembly, wherein an excitation signal source, a radio frequency coaxial line circulator and a reflection coefficient detection circuit, which are in an electric measuring loop, are mounted inside the electric transducing unit; the feeler level assembly comprises a support feeler lever, a probe insulator, a measuring probe, a feeler lever inner core, a feeler lever inner core insulator and a mounting flange; due to the one-way signal transmission property of the radio frequency coaxial line circulator, an excitation signal U1 can be separated from a reflection wave U2; the measuring probe and the feeler lever inner core can be integrally connected, and due to insulation of the probe insulator, the feeler lever inner core insulator and the support feeler lever, the feeler lever assembly is of a coaxial structure. On the basis of the reflection coefficient of the measuring feeler lever assembly, adverse influence caused by time drift and temperature drift of a circuit can be avoided, and in addition, as an action judgment criterion is only related to the structural size of the feeler lever assembly and the distribution state of a tested material around the feeler lever assembly, error influence of circuit elements can be avoided, and the stability is very high.
Description
Technical field
The application is related to a kind of stuff level switch, especially relates to a kind of reflective stuff level switch of high frequency traveling wave, and this traveling wave is anti-
The formula stuff level switch of penetrating employs feeler lever assembly reflectance factor and sentences Ju as action, has repelled the impact of circuit components error, because
This stability is high.
Background technology
During manufacture automatic control, it is frequently encountered the detection to material position, and the master of detectable substance discharge position
Method is wanted to be exactly to measure using stuff level switch, stuff level switch is always the difficulty of Level measurement to the detection of solid-state granular material
Point, is characterized in that testee electric characteristic is big with the parameter discrete of physical features, and material is liable to stick to sensor
Interference is formed on probe and leads to stuff level switch misoperation.
The stuff level switch of existing employing principles of electrical measurement is all constituted using to the dielectric coefficient of material, permeability, electrical conductivity
Complex impedance measures, when variable quantity is comparatively small under having material and no material state for measurand complex impedance, can be because of circuit
When drift lead to the misoperation of such stuff level switch with temperature drift.
All there is the defect need to being periodically adjusted when scene is run in the existing stuff level switch using principles of electrical measurement.
Content of the invention
The purpose of the present invention is the drawbacks described above overcoming prior art, provides a kind of high frequency stable, easy to use
The reflective stuff level switch of traveling wave.
In order to achieve the above object, the invention provides a kind of reflective stuff level switch of high frequency traveling wave it is characterised in that：Institute
State the reflective stuff level switch of high frequency traveling wave and include electric transducing unit and feeler lever assembly, be provided with described electric transducing unit
Exciting signal source in electric measurement loop, RF coaxial circulator and reflectance factor detecting circuit, described feeler lever assembly comprises
There are support feeler lever, probe insulation body, measuring probe, feeler lever inner core, feeler lever inner core insulator and mounting flange；
Described exciting signal source produces rf excitation signal U1, and this signal is by the respective end of described RF coaxial circulator
Mouth is applied on described feeler lever inner core；Core insulation in described support feeler lever, probe insulation body, measuring probe, feeler lever inner core, feeler lever
Body collectively constitutes coaxial measurement structure；The back wave U2 that described coaxial measurement structure can be formed by described RF coaxial circulator
It is oriented output；Described reflectance factor detecting circuit can enter to can get feeler lever after row operation with back wave U2 to pumping signal U1
The reflectance factor that assembly has；
Pumping signal U1 can be carried out effectively by the signal unidirectional transmission property of described RF coaxial circulator with back wave U2
Separate；
Described measuring probe is connected integral, by described probe insulation body and described feeler lever with described feeler lever inner core
Core insulation body and the insulation of described support feeler lever.
Preferably, described support feeler lever and described feeler lever inner core are hollow structure.
Preferably, described measuring probe is integral by threadeding with described feeler lever inner core.
Preferably, described probe insulation reveals partial-length in vitro and is more than 5 millimeters.
Preferably, described measuring probe exposed parts length is more than 10 millimeters.
Beneficial effects of the present invention at least following some：
1. measure reflectance factor as sentencing Ju by the use of the feeler lever assembly of coaxial configuration, avoid because of drift and temperature drift during circuit
The adverse effect brought, drastically increases the stability of the reflective stuff level switch of high frequency traveling wave.
2. in circuit model, exciting signal source can be any type of pierce circuit, as long as radiofrequency signal can be produced
?；RF coaxial circulator can be made by oneself it is also possible to buy finished product, but must mate in electric parameter with exciting signal source.
3. the reflectance factor of feeler lever assembly can be obtained divided by rf excitation signal U1 by back wave U2, rf excitation signal
U1 and back wave U2 is the relation being divided by, and the drift error of generation can be cancelled out each other, therefore the reflectance factor of feeler lever assembly
Do not affected with temperature drift by drift during circuit.
4. the physical dimension of feeler lever assembly and tested material distribution directly affect the reflectance factor of feeler lever assembly, because
This reflectance factor can sentence Ju as the measurement of stuff level switch.
5. high frequency traveling wave reflective stuff level switch floats when being proved to whole measurement process in measuring principle not by circuit
With the impact of temperature drift, its action sentence Ju reflectance factor only with the physical dimension of feeler lever assembly and probe assembly around tested material divide
Cloth state is related.
Brief description
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the principle schematic of the present invention；
Fig. 3 is the reflectance factor detection unit circuit diagram of the present invention.
Specific embodiment
For a better understanding of the present invention, below in conjunction with the accompanying drawings, retouch embodiment in detail.It should be understood that the present embodiment is only used for
The present invention is described, and the scope of the present invention can not be limited.
Unless otherwise indicated, the technological means that the present embodiment is adopted is ordinary skill in the art means.
Referring to Fig. 1, Fig. 2, the present invention including electric transducing unit 1 and feeler lever assembly B, in electric transducing unit 1
Exciting signal source 11 in electric measurement loop, RF coaxial circulator 12 and reflectance factor detecting circuit 13, feeler lever are installed
Assembly B includes support feeler lever 2, probe insulation body 3, measuring probe 4, feeler lever inner core 5, feeler lever inner core insulator 6 and suitable
The mounting flange 7 burn-on in place；Exciting signal source 11 produces rf excitation signal U1, and this signal passes through RF coaxial circulator 12
Corresponding port be applied on feeler lever inner core 5；Support in feeler lever 2, probe insulation body 3, measuring probe 4, feeler lever inner core 5, feeler lever
Core insulation body 6 collectively constitutes coaxial measurement structure；The back wave that coaxial measurement structure can be formed by RF coaxial circulator 12
U2 is oriented output；Reflectance factor detecting circuit 13 can enter to can get feeler lever after row operation with back wave U2 to pumping signal U1
The reflectance factor that assembly B has；The signal unidirectional transmission property of RF coaxial circulator 12 can be by pumping signal U1 and reflection
Ripple U2 carries out separating；Measuring probe 4 be connected with described feeler lever inner core 5 integral, exhausted with feeler lever inner core by probe insulation body 5
Edge body 6 and support feeler lever 2 insulate；Feeler lever 2 and described feeler lever inner core 5 is supported to be hollow structure；Measuring probe 4 and feeler lever inner core 5
By threaded integral, rotate the tensioning degree that feeler lever inner core 5 can adjust feeler lever inner core 5 and measuring probe 4；Probe is absolutely
Edge body 3 exposed parts length is more than 5 millimeters；Measuring probe 4 exposed parts length is more than 10 millimeters.
Support feeler lever 2, measuring probe 4 and feeler lever inner core 5 all using conductive metallic material；Support feeler lever 2 and feeler lever inner core 5
Two ends are fixed with feeler lever inner core insulator 6 using probe insulation body 3, and probe insulation body 3, feeler lever inner core insulator 6 are selected
High-temperature insulation material；Feeler lever inner core insulator 6 is convex hollow ring, and this ring is the fixing point of feeler lever inner core 5；Feeler lever inner core 5
Fixing end vertical section is T-shaped, prevents feeler lever inner core 5 from moving forward and backward；Measuring probe 4 leading portion is hemisphere；Stage casing is big cylinder；
Latter end is small cylinder.Feeler lever 2 is supported to adopt stainless steel thick-wall tube, one end can be connected as an entirety with electric transducing unit 1,
Connected mode can be using threaded it is also possible to be connected by securing member；The other end passes through machining at opening and expands internal diameter,
And leaving thrust step, thrust step is used for preventing feeler lever inner core 5 from because of overtension, probe insulation body 3 is drawn in support feeler lever
In 2.
The in the hole that measuring probe 4 end microcephaly is pressed into probe insulation body 3 forms probe assembly A, and then will pop one's head in assembly A
Push in support feeler lever 2 at thrust step, the hemisphere of measuring probe 4 is outside.Cover in the another port supporting feeler lever 2
Then feeler lever inner core 5 is passed through feeler lever inner core insulator 6 centre bore and screws in the microcephaly of measuring probe 4 by feeler lever inner core insulator 6
In screw.
Turn feeler lever inner core 5, is supporting the tensioning degree in feeler lever 2 it is ensured that feeler lever inner core 5 in order to adjust feeler lever inner core 5
Can not arbitrarily shake supporting in feeler lever 2.Assembly will be popped one's head in using external pressure machinery with to support feeler lever 2 to compress formation tight
Cooperation, prevents from loosening in use.Assembling process can be coated on each composition surface refractory seals glue with
Improve hermetic properties.The feeler lever assembling assembly (B) is connected with electric transducing unit 1.Electric measurement loop is installed to
Electrically connect in transducing unit 1 and by each loop.
Electrically transducing unit 1, as the installation position in electric measurement loop, is always shaped as an entirety with convenient with feeler lever
The realization of measurement function, electric transducing unit 1 can be that metal shell can also adopt plastic casing, and the present embodiment adopts cast aluminium
Shell.Exciting signal source 11 can be any type of pierce circuit, and the present embodiment uses conventional capacitance bikini and shakes
Swing circuit, frequency of oscillation 800MHz about.RF coaxial circulator 12 is conventional electronic device, and market has finished product to sell, selects
With the close device of a width of 300～1875MHz or other parameters.Reflectance factor detecting circuit can use custom hardware divider
Computing is simulated to U2 and U1 bis- road signal, realizes the detection of the reflectance factor of feeler lever assembly (B), it would however also be possible to employ to U2 with
U1 obtains the reflectance factor of feeler lever assembly (B) by single-chip microcomputer after carrying out analog/digital conversion after calculating, and the present embodiment adopts rear one
The method of kind.
A/D sampling for convenience, first carries out detection process to high-frequency signal U2 and U1, high frequency ac signal is converted into directly
Stream level signal, Fig. 3 is shown in by detecting circuit.L1 and L2 is common hollow inductance, and C1 and C2 is filter capacitor, and R1 and R2 is commonly electric
Resistance, D1 and D2 is detector diode, and operating frequency selects more than 2GHz device.High-frequency signal U2 and U1 carries out warp after detection process
A/D conversion sends into SCM system, by single-chip microcomputer through carrying out can get probe segment after simple computation to two road signals
Reflectance factor, the reflectance factor of root Ju probe segment just can determine that whether stuff level switch should action.
Claims (5)
1. a kind of reflective stuff level switch of high frequency traveling wave it is characterised in that：The reflective stuff level switch of described high frequency traveling wave includes electricity
Gas transducing unit (1) and feeler lever assembly (B), are provided with the excitation in electric measurement loop in described electric transducing unit (1)
Signal source (11), RF coaxial circulator (12) and reflectance factor detecting circuit (13), described feeler lever assembly (B) includes support
Feeler lever (2), probe insulation body (3), measuring probe (4), feeler lever inner core (5), feeler lever inner core insulator (6) and mounting flange (7)；
Described exciting signal source (11) produces rf excitation signal U1, and this signal is by the phase of described RF coaxial circulator (12)
Port is answered to be applied on described feeler lever inner core (5)；Described support feeler lever (2), probe insulation body (3), measuring probe (4), feeler lever
Inner core (5), feeler lever inner core insulator (6) collectively constitute coaxial measurement structure；Described RF coaxial circulator (12) can be by institute
The back wave U2 stating coaxial measurement structure formation is oriented output；Described reflectance factor detecting circuit (13) can be to pumping signal
U1 and back wave U2 can get, after entering row operation, the reflectance factor that feeler lever assembly (B) has；
Pumping signal U1 can be carried out effectively by the signal unidirectional transmission property of described RF coaxial circulator (12) with back wave U2
Separate；
Described measuring probe (4) be connected with described feeler lever inner core (5) integral, by described probe insulation body (3) with described
Feeler lever inner core insulator (6) and described support feeler lever (2) insulation.
2. the reflective stuff level switch of high frequency traveling wave piece described in Ju claim 1 it is characterised in that：Described support feeler lever (2) with
Described feeler lever inner core (5) is hollow structure.
3. the reflective stuff level switch of high frequency traveling wave piece described in Ju claim 1 it is characterised in that：Described measuring probe (4) with
Described feeler lever inner core (5) is by threaded integral.
4. the reflective stuff level switch of high frequency traveling wave piece described in Ju claim 1 it is characterised in that:Described probe insulation body (3)
Exposed parts length is more than 5 millimeters.
5. the reflective stuff level switch of high frequency traveling wave piece described in Ju claim 1 it is characterised in that：Described measuring probe (4) is outward
Dew partial-length is more than 10 millimeters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610864444.9A CN106441503A (en) | 2016-09-29 | 2016-09-29 | High-frequency traveling wave reflecting type material level switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610864444.9A CN106441503A (en) | 2016-09-29 | 2016-09-29 | High-frequency traveling wave reflecting type material level switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106441503A true CN106441503A (en) | 2017-02-22 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610864444.9A Pending CN106441503A (en) | 2016-09-29 | 2016-09-29 | High-frequency traveling wave reflecting type material level switch |
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| Country | Link |
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| CN (1) | CN106441503A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107816884A (en) * | 2017-12-08 | 2018-03-20 | 郑州市同鼎机械设备有限公司 | Dryer with anti-blocking automatically cleaning hacking is controlled based on PLC |
| US11438165B2 (en) | 2017-03-28 | 2022-09-06 | Advanced New Technologies Co., Ltd. | Method and apparatus for processing transaction requests |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040036043A1 (en) * | 2002-08-15 | 2004-02-26 | Murshid Syed H. | Fiber optic level detector |
| CN1514212A (en) * | 2002-12-09 | 2004-07-21 | ͬ�Ϳ�ҵ��ʽ���� | Vehicle fuel quantity measuring device using power transmission sequence |
| CN201265020Y (en) * | 2008-10-15 | 2009-07-01 | 北京首钢国际工程技术有限公司 | Special material level switch for blast furnace dry method ash removal |
-
2016
- 2016-09-29 CN CN201610864444.9A patent/CN106441503A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040036043A1 (en) * | 2002-08-15 | 2004-02-26 | Murshid Syed H. | Fiber optic level detector |
| CN1514212A (en) * | 2002-12-09 | 2004-07-21 | ͬ�Ϳ�ҵ��ʽ���� | Vehicle fuel quantity measuring device using power transmission sequence |
| CN201265020Y (en) * | 2008-10-15 | 2009-07-01 | 北京首钢国际工程技术有限公司 | Special material level switch for blast furnace dry method ash removal |
Non-Patent Citations (1)
| Title |
|---|
| 桂林 等: ""基于场效应原理的高性能料位开关"", 《湖北电力》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11438165B2 (en) | 2017-03-28 | 2022-09-06 | Advanced New Technologies Co., Ltd. | Method and apparatus for processing transaction requests |
| CN107816884A (en) * | 2017-12-08 | 2018-03-20 | 郑州市同鼎机械设备有限公司 | Dryer with anti-blocking automatically cleaning hacking is controlled based on PLC |
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Application publication date: 20170222 |