CN207300813U - Oil liquid abrasive grain monitors sensor - Google Patents
Oil liquid abrasive grain monitors sensor Download PDFInfo
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- CN207300813U CN207300813U CN201721319711.0U CN201721319711U CN207300813U CN 207300813 U CN207300813 U CN 207300813U CN 201721319711 U CN201721319711 U CN 201721319711U CN 207300813 U CN207300813 U CN 207300813U
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- signal
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- output terminal
- oil liquid
- abrasive grain
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Abstract
The utility model discloses a kind of oil liquid abrasive grain monitoring sensor, is mainly made of driving source, detection modular converter, Signal-regulated kinase and signal acquisition module；Above-mentioned detection modular converter includes 2 identical PCB plane coils, 2 identical capacitances and 2 identical resistance.Signal-regulated kinase includes 2 identical conditioning branches and 1 differential amplifier circuit；The input terminal of 2 conditioning branches forms 2 input terminals of Signal-regulated kinase, and is connected respectively with detecting an output terminal of modular converter；2 input terminals of the output terminal connection differential amplifier circuit of 2 conditioning branches, the output terminal of differential amplifier circuit forms the output terminal of Signal-regulated kinase, and is connected with the input terminal of signal acquisition module.The utility model is based on electric vortex type PCB plane coil pickoff, has the features such as simple in structure, high sensitivity, the range of linearity is big, strong antijamming capability, non-cpntact measurement and low cost.
Description
Technical field
It the utility model is related to Oil Monitoring Technique field, and in particular to a kind of oil liquid abrasive grain monitors sensor.
Background technology
The machinery to run at high speed easily produces metal worn particle due to wearing, these abrasive particles can cause the lubricating system of machinery
Pollution, so as to trigger mechanical disorder.A statistics made to mechanical fault diagnosis shows at the same time：Mechanical equipment
Fail 80 percent be because inordinate wear cause caused by lubricating system failure.Therefore for industrial quarters, effective oil
Liquid wear particle monitoring prevents mechanical equipment fault and plays an important role on the prediction mechanical equipment service life in Environmental Safety.
At present, there are optical detection, capacitance detecting method and acoustic method for the method for oil liquid abrasive grain monitoring.Optics is examined
Survey method precision is easily subject to bubble in oil cleanliness, particle surface reflectance factor and fluid etc. to influence；Capacitance detecting method
Had a great influence be subject to fluid total acid number and moisture content, be not easy to detect abrasive particle；Acoustic method be easily subject to ambient noise and
The interference of oil temperature fluctuation.
Utility model content
To be solved in the utility model is the problem of existing oil liquid abrasive grain monitoring method monitoring effect is bad, there is provided a kind of
Oil liquid abrasive grain monitors sensor.
To solve the above problems, the utility model is achieved through the following technical solutions：
A kind of oil liquid abrasive grain monitors sensor, is mainly adopted by driving source, detection modular converter, Signal-regulated kinase and signal
Collect module composition；Above-mentioned detection modular converter include 2 identical PCB plane coil L1-L2,2 identical capacitance C1-C2,
And 2 identical resistance R1-R2；One end of resistance R1 is connected with one end of PCB plane coil L1, forms detection modular converter
An input terminal and be connected with one end of driving source；One end of resistance R2 is connected with one end of PCB plane coil L2, forms inspection
Survey another input terminal of modular converter and be connected with the other end of driving source；Resistance R1 and resistance R2 are in series, and resistance R1
An output terminal of detection modular converter is formed with the connected end of resistance R2；PCB plane coil L1 goes here and there with PCB plane coil L2 phases
Connection, and the connected end of PCB plane coil L1 and PCB plane coil L2 form another output terminal of detection modular converter；Capacitance
C1 is connected in parallel on the both ends of PCB plane coil L1；Capacitance C2 is connected in parallel on the both ends of PCB plane coil L2；Signal-regulated kinase includes 2
The identical conditioning branch of bar and 1 differential amplifier circuit；2 of the input terminal formation Signal-regulated kinase of 2 conditioning branches are defeated
Enter end, and be connected respectively with detecting an output terminal of modular converter；The output terminal connection differential amplifier circuit of 2 conditioning branches
2 input terminals, the output terminal of differential amplifier circuit forms the output terminal of Signal-regulated kinase, and defeated with signal acquisition module
Enter end to be connected.
In such scheme, driving source is the controllable sinusoidal signal generator of frequency.
In such scheme, the frequency f of pumping signal caused by driving source, the PCB plane coil with detecting modular converter
The selection of the capacitance C of the inductance value L and capacitance C1-C2 of L1-L2 need to follow formula：
In such scheme, PCB plane coil L1-L2 be on a printed circuit board make and the coiling that is square it is copper
Coil.
In such scheme, PCB plane coil L1-L2 is sandwich construction, and the coil turn in every layer line circle, spacing and big
Small parameter is identical, and identical per the coiling direction of layer line circle.
In such scheme, every conditioning branch is formed by power amplification circuit, detecting circuit and low-pass filter circuit；
The input terminal of power amplification circuit forms the input terminal of the conditioning branch, and the output terminal of power amplification circuit connects via detecting circuit
The input terminal of low-pass filter circuit is connect, the output terminal of low-pass filter circuit forms the output terminal of the conditioning branch.
In such scheme, full-wave detection circuit that detecting circuit is made of half-wave detector and adder operational amplifier.
In such scheme, low-pass filter circuit is with fourth order low-pass wave filter.
In such scheme, signal acquisition module includes analog to digital conversion circuit and MCU microcontrollers；Analog to digital conversion circuit it is defeated
Enter the input terminal that end forms signal acquisition module, the output terminal of analog to digital conversion circuit is connected with the input terminal of MCU microcontrollers.
In such scheme, signal acquisition module still further comprises LCD display, the LCD display and MCU microcontrollers
Connection.
Compared with prior art, the utility model is based on electric vortex type PCB plane coil pickoff, have it is simple in structure,
The features such as high sensitivity, the range of linearity is big, strong antijamming capability, non-cpntact measurement and low cost；The utility model reduces biography
Sensor volume, reduces monitoring cost, so that adding oil liquid abrasive grain monitoring technology for microsensor provides a kind of feasible side
Method.
Brief description of the drawings
Fig. 1 is the circuit diagram that oil liquid abrasive grain monitors sensor.
Fig. 2 is the circuit diagram of detection modular converter.
Fig. 3 is the structure diagram of PCB plane coil.
Embodiment
For the purpose of this utility model, technical solution and advantage is more clearly understood, below in conjunction with instantiation, and join
According to attached drawing, the utility model is further described.
A kind of oil liquid abrasive grain monitors sensor, as shown in Figure 1, mainly by driving source, detection modular converter, signal condition mould
Block and signal acquisition module composition.
Above-mentioned driving source is the controllable sinusoidal signal generator of frequency, can be passed by controlling the frequency of driving source to adjust
Sensor sensitivity, driving frequency is selected according to fluid caliber, and preferable spirit can be obtained using high-frequency excitation when caliber is small
Sensitivity, uses low-frequency excitation, can obtain preferable sensitivity, design parameter is adjusted by testing when fluid caliber is big.
In the utility model, driving source selects powerful sinusoidal excitation source, to improve the sensitivity of detection and the linearity, while to survey
Measure modular converter power supply.Chip DDS9833 chips are occurred using Direct Digital Synthesizer signal, pass through microcontroller control
Make the modulated sinusoidal waveform of its signal output frequency output frequency.Sine wave signal amplifies through current mode operational amplifier, with
The load capacity of pumping signal is improved, increases output voltage amplitude and output power.
Above-mentioned detection modular converter uses the form of AC bridge impedance ratio electric bridge, as shown in Fig. 2, identical including 2
PCB plane coil L1-L2,2 identical capacitance C1-C2 and 2 identical resistance R1-R2.PCB plane coil L1-L2 is
Detecting element, and be installed on the outside of fluid pipeline.One end of resistance R1 is connected with one end of PCB plane coil L1, forms detection
One input terminal of modular converter is simultaneously connected with one end of driving source；One end of resistance R2 and one end phase of PCB plane coil L2
Even, form another input terminal of detection modular converter and be connected with the other end of driving source.Resistance R1 and resistance R2 are in series,
And the connected end of resistance R1 and resistance R2 form an output terminal of detection modular converter；PCB plane coil L1 and PCB plane line
Circle L2 is in series, and the connected end of PCB plane coil L1 and PCB plane coil L2 form another output of detection modular converter
End.Capacitance C1 is connected in parallel on the both ends of PCB plane coil L1；Capacitance C2 is connected in parallel on the both ends of PCB plane coil L2.2 PCB planes
Two bridge arms of the coil L1-L2 as bridge circuit；One connects fluid pipeline, as measuring coil；Another does not access oil
Liquid pipe road, as temperature-compensating coil；It is consequently formed differential circuit.When metal worn particle enters fluid, and positioned at the inspection of sensor
When surveying scope, coil inductance changes so that electric bridge disequilibrium, output voltage signal.
Referring to Fig. 3, PCB plane coil L1-L2 is the copper of coiling that be produced on printed circuit board substrate and be square
Coil.Coil L1-L2 is sandwich construction, and the parameter such as the number of turn in every layer line circle, spacing and size is identical, and per layer line
The coiling direction of circle is identical.Electromagnetic field analysis is carried out to PCB plane coil by electromagnetic field simulation software, can be obtained：Coil right angle
There is an electromagnetism integrated distribution phenomenon at place, the number of turn of coil, the size of metal worn particle, size of the distance of abrasive particle and coil and coil etc.
Parameter can all influence sensitivity and the linearity of sensor.Within the specific limits, with the number of turn, metallic particles and sensor
Distance, and the increase of excitation source frequency, the eddy-current loss of generation also can be with increase.So for increase impedance, sensing is improved
The sensitivity of device, sets PCB plane loop construction as sandwich construction, and identical per the coiling direction of layer line circle, selects optimal
Coil turn, line-spacing and line width, design parameter can be adjusted according to fluid pipeline diameter size, needs of measurement sensitivity etc.
Section, and by determining its parameter after emulation.In addition, driving source selects powerful sinusoidal excitation source.Its PCB plane coil inductance
Calculation formula is as follows：
In formula：u0For space permeability；N is coil turn；B is the length of hub of a spool coil；C is hub of a spool coil
Width；R is the width of coil；A is the thickness of coil；Square coil b=c.
This detection modular converter uses alternating current bridge method, using the form of impedance ratio bridge, is made with PCB plane coil L1-L2
For two bridge arms of electric bridge, one is used to measure, another is used for the influence for eliminating temperature, an identical resistance of connecting respectively
One identical capacitance C of R and parallel connection.Have：
Take ω (L1+L2)=ω3CL1L2, L1=L2：
In formula：Z1For capacitance and L1Total impedance after parallel connection；Z2For capacitance and L2Total impedance after parallel connection；For driving source electricity
Pressure；Δ L is L1With L2Difference；Δ U is the difference of voltage change.
The selection of capacitance needs to follow the following formula：
In formula, f is the frequency of driving source, and L is coil inductance, and C is selected capacitance.When frequency, inductance and capacitance it
Between relation when meeting the formula, the energy that coil obtains is maximum, the sensitivity highest of sensor.
In the input terminal addition sinusoidal excitation source of detection modular converter, when metal worn particle enters fluid, and it is located at sensor
Detection range in, coil inductance change, electric bridge disequilibrium, the inductance signal Δ L of change is converted into the voltage signal of change
Δ U, electric bridge both ends are equivalent to the high frequency electrical signal that output is crossed by metal worn particle modulates information.
PCB plane coil is based on eddy current effect and realizes detection, it will not be subject to oil cleanliness, oil product non-electrolyte to add
Add the influence of the factors such as thing, acid-base value and bubble.
Above-mentioned Signal-regulated kinase includes 2 identical conditioning branches and 1 differential amplifier circuit.Wherein every conditioning branch
Road is formed by power amplification circuit, detecting circuit and low-pass filter circuit；The input terminal of power amplification circuit forms the tune
The input terminal of branch is managed, the output terminal of power amplification circuit connects the input terminal of low-pass filter circuit via detecting circuit, low
The output terminal of bandpass filter circuit forms the output terminal of the conditioning branch.The input terminal of 2 conditioning branches forms signal condition mould
2 input terminals of block, and be connected respectively with detecting an output terminal of modular converter；The output terminal connection of 2 conditioning branches is poor
Divide 2 input terminals of amplifying circuit, the output terminal of differential amplifier circuit forms the output terminal of Signal-regulated kinase, and is adopted with signal
The input terminal of collection module is connected.In the utility model, detecting circuit is made of half-wave detector and adder operational amplifier
Full-wave detection circuit.Low-pass filter circuit is with fourth order low-pass wave filter.Differential amplifier circuit uses versatile smart instrument
Amplification chip, the differential amplifier circuit, to regulate and control amplification factor, can be distinguished with external adjustable potentiometer in positive-negative power incoming end
Plus a decoupling capacitor, the stability of input signal is improved, output foot is using a pi type filter filtering, raising output
The stability of signal, and two big resistance are terminated in Differential Input, to increase bias current return path.
The course of work of Signal-regulated kinase is：First, signal is exported to detection modular converter by power amplification circuit
Carry out High frequency amplification.Then, full-wave detection is carried out to amplified signal using detecting circuit, full-wave detection is mainly examined by half-wave
Ripple device and adder operational amplifier composition, the frequency of the signal after full-wave detection is twice of detection front signal frequency, is protected
The positive half period signal of sinusoidal signal is stayed, negative half-cycle signal is overturn, becomes positive half period signal.Afterwards, using Sallen-
Key types low-pass filter handles rectified signal, and the low frequency signal for carrying abrasive particle information is filtered out, and exports d. c. voltage signal.Most
Afterwards, differential amplification is carried out to two paths of signals using versatile smart instrument amplification chip INA114.
Above-mentioned signal acquisition module includes analog to digital conversion circuit, MCU microcontrollers and LCD display.Analog to digital conversion circuit
Input terminal form the input terminal of signal acquisition module, the output terminal of analog to digital conversion circuit and the input terminal phase of MCU microcontrollers
Even.LCD display is connected with MCU microcontrollers.In the utility model, MCU microcontrollers using STC89C52, FPGA or
ARM chips, come with crystal oscillating circuit, reset circuit and display driver circuit on chip.Analog to digital conversion circuit uses digital-to-analogue conversion
Chip ADS1232, and external crystal-controlled oscillation is used by MCU microprocessor controls, chip.
The course of work of signal acquisition module is：Analog to digital conversion circuit carries out analog-to-digital conversion to analog electrical signal.Modulus turns
Circuit is changed there are numerical portion and analog portion, is powered respectively to analog portion and numerical portion using 5V power supplys, while in order to
With preventing simulation to interference digitally, will be digitally connected with a resistance or magnetic bead with simulation.To analog electrical signal
After carrying out analog-to-digital conversion, using MCU microcontrollers processing data and the input and output of digital signal are controlled, and by the information of processing
By display circuit real-time display on LED display, can real-time online show metal worn particle number and size, can to more than
Abrasive particle threshold status carries out alarm, can assess the service life of machine, reflects the use state of machinery equipment.
It should be noted that it is the implementation to the utility model above with respect to embodiment described in the utility model
Illustrate, be not the limitation to the utility model, therefore the utility model is not limited in above-mentioned embodiment.
In the case where not departing from the utility model principle, every those skilled in the art obtained under the enlightenment of the utility model its
Its embodiment, is accordingly to be regarded as within the protection of the utility model.
Claims (10)
1. oil liquid abrasive grain monitors sensor, it is characterised in that：Mainly by driving source, detection modular converter, Signal-regulated kinase and
Signal acquisition module forms；
Above-mentioned detection modular converter includes 2 identical PCB plane coil L1-L2,2 identical capacitance C1-C2 and 2
Identical resistance R1-R2；One end of resistance R1 is connected with one end of PCB plane coil L1, forms one of detection modular converter
Input terminal is simultaneously connected with one end of driving source；One end of resistance R2 is connected with one end of PCB plane coil L2, forms detection conversion
Another input terminal of module is simultaneously connected with the other end of driving source；Resistance R1 and resistance R2 are in series, and resistance R1 and resistance
The connected end of R2 forms an output terminal of detection modular converter；PCB plane coil L1 and PCB plane coil L2 are in series, and
The connected end of PCB plane coil L1 and PCB plane coil L2 form another output terminal of detection modular converter；Capacitance C1 is in parallel
At the both ends of PCB plane coil L1；Capacitance C2 is connected in parallel on the both ends of PCB plane coil L2；
Signal-regulated kinase includes 2 identical conditioning branches and 1 differential amplifier circuit；The input terminal shape of 2 conditioning branches
Into 2 input terminals of Signal-regulated kinase, and it is connected respectively with detecting an output terminal of modular converter；2 conditioning branches
Output terminal connects 2 input terminals of differential amplifier circuit, and the output terminal of differential amplifier circuit forms the output of Signal-regulated kinase
End, and be connected with the input terminal of signal acquisition module.
2. oil liquid abrasive grain according to claim 1 monitors sensor, it is characterised in that：Driving source is the controllable sine of frequency
Signal generator.
3. oil liquid abrasive grain according to claim 1 or 2 monitors sensor, it is characterised in that：Excitation caused by driving source
The frequency f of signal, the choosing of the capacitance C of the inductance value L and capacitance C1-C2 of the PCB plane coil L1-L2 with detecting modular converter
Selecting needs to follow formula：
4. oil liquid abrasive grain according to claim 1 monitors sensor, it is characterised in that：PCB plane coil L1-L2 be
The copper coil of making and the coiling that is square on printed circuit board.
5. oil liquid abrasive grain according to claim 4 monitors sensor, it is characterised in that：PCB plane coil L1-L2 is multilayer
Structure, and coil turn in every layer line circle, spacing are identical with size parameter, and it is identical per the coiling direction of layer line circle.
6. oil liquid abrasive grain according to claim 1 monitors sensor, it is characterised in that：Every conditioning branch is put by power
Big circuit, detecting circuit and low-pass filter circuit composition；The input terminal of power amplification circuit forms the input of the conditioning branch
End, the output terminal of power amplification circuit is via the input terminal of detecting circuit connection low-pass filter circuit, low-pass filter circuit
Output terminal form the output terminal of the conditioning branch.
7. oil liquid abrasive grain according to claim 6 monitors sensor, it is characterised in that：Detecting circuit for half-wave detector and
The full-wave detection circuit that adder operational amplifier is formed.
8. oil liquid abrasive grain according to claim 6 monitors sensor, it is characterised in that：Low-pass filter circuit is to use quadravalence
Low-pass filter.
9. oil liquid abrasive grain according to claim 1 monitors sensor, it is characterised in that：Signal acquisition module turns including modulus
Change circuit and MCU microcontrollers；The input terminal of analog to digital conversion circuit forms the input terminal of signal acquisition module, analog to digital conversion circuit
Output terminal be connected with the input terminal of MCU microcontrollers.
10. oil liquid abrasive grain according to claim 8 monitors sensor, it is characterised in that：Signal acquisition module is also further
Including LCD display, which is connected with MCU microcontrollers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721319711.0U CN207300813U (en) | 2017-10-13 | 2017-10-13 | Oil liquid abrasive grain monitors sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721319711.0U CN207300813U (en) | 2017-10-13 | 2017-10-13 | Oil liquid abrasive grain monitors sensor |
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| Publication Number | Publication Date |
|---|---|
| CN207300813U true CN207300813U (en) | 2018-05-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721319711.0U Expired - Fee Related CN207300813U (en) | 2017-10-13 | 2017-10-13 | Oil liquid abrasive grain monitors sensor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107589051A (en) * | 2017-10-13 | 2018-01-16 | 桂林电子科技大学 | Oil liquid abrasive grain monitors sensor |
| CN109100270A (en) * | 2018-08-29 | 2018-12-28 | 大连海事大学 | A kind of annular fluid channel oil liquid detection device and preparation method thereof |
| WO2021237375A1 (en) * | 2020-05-28 | 2021-12-02 | 浙江中欣动力测控技术有限公司 | Double-coil group online monitoring system for lubricating oil dust |
-
2017
- 2017-10-13 CN CN201721319711.0U patent/CN207300813U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107589051A (en) * | 2017-10-13 | 2018-01-16 | 桂林电子科技大学 | Oil liquid abrasive grain monitors sensor |
| CN109100270A (en) * | 2018-08-29 | 2018-12-28 | 大连海事大学 | A kind of annular fluid channel oil liquid detection device and preparation method thereof |
| CN109100270B (en) * | 2018-08-29 | 2020-10-02 | 大连海事大学 | Annular micro-channel oil liquid detection device and manufacturing method thereof |
| WO2021237375A1 (en) * | 2020-05-28 | 2021-12-02 | 浙江中欣动力测控技术有限公司 | Double-coil group online monitoring system for lubricating oil dust |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
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Granted publication date: 20180501 Termination date: 20181013 |