CN106679762A - Water level sensor for ocean water level monitoring - Google Patents
Water level sensor for ocean water level monitoring Download PDFInfo
- Publication number
- CN106679762A CN106679762A CN201710029563.7A CN201710029563A CN106679762A CN 106679762 A CN106679762 A CN 106679762A CN 201710029563 A CN201710029563 A CN 201710029563A CN 106679762 A CN106679762 A CN 106679762A
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- gate
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- electrically connected
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- water level
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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
- G01F23/80—Arrangements for signal processing
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Emergency Alarm Devices (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The invention discloses a water level sensor for ocean water level monitoring. The water level sensor for ocean water level monitoring comprises a dual-electrode probe, a first current amplification unit, a second current amplification unit, a first signal isolation unit connected with the first current amplification unit, a second signal isolation unit connected with the first current amplification unit, an oscillator unit for producing a reference square wave signal and a power supply unit, wherein the first current amplification unit, the second current amplification unit are connected to the dual-electrode probe. The first current amplification unit comprises a mos tube. The second current amplification unit comprises an audion. The first signal isolation unit comprises a first optoelectronic isolator, a second resistor and a third resistor. The second current amplification unit comprises a second optoelectronic isolator, a fourth resistor and a fifth resistor. The oscillator unit comprises a sliding resistor, a capacitor, a fourth NOT gate and a fifth NOT gate. A logic unit comprises a seventh NOT gate and an AND gate. A counting unit comprises a counter and a double-row socket. The defects of delayed alarming, mistaken alarming and alarm signal chaos existing in a water level alarm apparatus are overcome.
Description
Technical field
The present invention relates to ocean water level monitoring device technical field, more particularly to a kind of ocean water level monitoring is passed with water level
Sensor.
Background technology
Water-level alarm sensor can monitor moisture storage capacity in container, while can also report to the police as the water inlet of confined space passing
Sensor.Especially, there is sealed electronic cabin, depositing for electronic equipment in the instrument and equipment in ocean, lake, river
Storage.For the operation steady in a long-term of equipment, safety real-time monitoring system is mounted in equipment, wherein water inlet alarm sensor is
Requisite safety monitoring device.
Conventional water level alarm has mechanical ball float water level alarm, magnetic induction water level alarm, electronic type water level alarm
Deng.Mechanical ball float water level alarm is the location triggered switch alarm for changing ball float by water level；Magnetic induction water level alarm is
Change annular magnet ball float location triggered magnetic reed switch by water level to report to the police；Electronic type water-level gauge is entered by electronic probe to water level
Row monitoring changes the low and high level state of output signal and starts warning.Also have in individual plants using humidity sensor as entering
Water alarm sensor is used, and is reported to the police by the change triggering of device interior relative humidity.
Mechanical ball float water level alarm, magnetic induction water level alarm could trigger water only after water level reach a certain height
Level alarm, it is impossible to enough meet compared with low-water alarm.Especially, it is impossible to when enough satisfactions are as water inlet alarm sensor, real-time report
Alert demand.In addition, when equipment is kept in motion, ball float or mechanical arm are occurred position change by inertia effects, cause to miss
The presence of warning phenomenon.
Whether electronic type water level alarm in the market is immersed in the water state using two electrodes of sensing, so as to change
The low and high level triggering of varying signal output is reported to the police.
Bipolar electrode one extremely directly connects DC source, and when bipolar electrode is immersed in the water, two electrode conductions are defeated by amplifier
Go out high level, otherwise export low level.When instrument and the water surface have relative motion, cause output signal unstable, increased
The difficulty of later stage signal extraction.
During using humidity sensor as water inlet alarm sensor, when humidity is installed by instrument in instrument, especially field
Ambient humidity affects larger when safeguarding, is not easy to effective extraction of alarm signal.
The content of the invention
The technical problem to be solved in the present invention is：A kind of ocean water level monitoring level sensor is provided；The ocean water level
Monitoring level sensor can adapt to the adverse circumstances of ocean, while can solve the problem that the time delay report that current water level alarm is present
The disorderly defect of alert, false alarm and alarm signal.
The present invention is adopted the technical scheme that to solve technical problem present in known technology：
A kind of ocean water level monitoring level sensor, at least includes：
Bipolar electrode is popped one's head in；
The first current amplification unit and the second current amplification unit being connected on bipolar electrode probe；Wherein：Described first
Current amplification unit is managed including mos；Second current amplification unit includes audion；The source electrode and bipolar electrode of the mos pipes
One electrode electrical connection of probe；The base stage of the audion is electrically connected with another electrode that bipolar electrode is popped one's head in；
The the first signal isolation unit electrically connected with the first current amplification unit；The first signal isolation unit includes the
One photoisolator, second resistance and 3rd resistor；The signal input terminal of first photoisolator respectively with mos
The drain and gate electrical connection of pipe；The grid of the mos pipes is grounded by 3rd resistor；The signal of first photoisolator
Lead-out terminal is grounded by second resistance；The drain electrode of the mos pipes is electrically connected with power supply terminal；
The secondary signal isolated location electrically connected with the second current amplification unit；The secondary signal isolated location includes the
Two photoisolators, the 4th resistance and the 5th resistance；The signal input terminal of second photoisolator and audion
Colelctor electrode is electrically connected；The emitter stage of the audion is electrically connected with the outfan of the second photoisolator；Second photoelectricity every
Input terminal from device passes through the 5th resistance eutral grounding；The grounded emitter of the audion；Second photoisolator it is defeated
Go out end to electrically connect with power supply terminal by the 4th resistance；
For producing the oscillator unit of reference square wave signal；The oscillator unit include slide resistor, electric capacity, the
Four not gates, the 5th not gate；The lead-out terminal of the 4th not gate is electrically connected with the input terminal of the 5th not gate；5th not gate
Lead-out terminal electrically connect with the lead-out terminal of the first photoisolator；The input terminal of the 4th not gate is by electric capacity and the
The lead-out terminal electrical connection of five not gates；The input terminal of the 4th not gate is by slide resistor and the outfan of the 4th not gate
Son electrical connection；
Logical block；The logical block includes the 7th not gate and door；The first terminal of the 7th not gate with door
First input end is electrically connected；It is described to electrically connect with the lead-out terminal of the second photoisolator with the second input terminal of door；Institute
State and electrically connected with power supply terminal by the 4th resistance with the second input terminal of door；
Counting unit；The counting unit includes enumerator and double socket；The lead-out terminal and enumerator with door
Clock terminal electrical connection；The lead-out terminal of the enumerator is electrically connected with the input terminal of double socket；The double socket
Lead-out terminal electrically connect with alarm signal terminal；The alarm signal terminal is electrically connected with the input terminal of the 7th not gate；Institute
The reseting terminal for stating enumerator connects reset signal；
And the power supply unit for for above-mentioned each unit providing electric energy.
Further：The mos pipes are p-channel mos pipes.
Further：Hydrophobic coat is scribbled on the housing of the bipolar electrode probe.
Further：The counting unit includes the first enumerator, the second enumerator and the 3rd enumerator being sequentially connected in series.
The present invention has the advantages and positive effects that：
Popped one's head in as water level monitoring using bipolar electrode by adopting above-mentioned technical proposal, the present invention, compact conformation is realized
The accurate installation of differing heights, it is to avoid delayed alarm；
The present invention is popped one's head in using bipolar electrode as water level monitoring, it is to avoid false alarm phenomenon caused by inertia；
The present invention using frequency signal as bipolar electrode power supply and the second current amplification unit, secondary signal isolated location,
The input signal of logical block, by counting unit accumulated counts alarm signal is produced, it is to avoid level sensor exists with the water surface
Relative motion alarm signal disorder phenomenon；
Alarm signal of the present invention is formed by logical block to counter unit to be fed back, and forms stable alarm signal；
The present invention can receive the reset signal of host computer, realize the reset of system；
It is adjustable that oscillator unit frequency-adjustable of the present invention, counter unit count number；
The surface of bipolar electrode probe of the present invention scribbles hydrophobic coat, realizes that steam at probe, droplets form produce false alarm
And alarm signal resets rapidly.
Description of the drawings
Fig. 1 is the circuit block diagram of the preferred embodiment of the present invention；
Fig. 2 is the circuit diagram of the preferred embodiment of the present invention；
Fig. 3 is the frequency signal figure in the preferred embodiment of the present invention；
Specific embodiment
For the content of the invention, feature and effect of the present invention can be further appreciated that, following examples are hereby enumerated, and coordinate accompanying drawing
Describe in detail as follows：
Refer to Fig. 1 to Fig. 3, a kind of ocean water level monitoring level sensor, including：
Bipolar electrode probe P1；
The first current amplification unit and the second current amplification unit being connected on bipolar electrode probe；Wherein：Described first
Current amplification unit includes mos pipe Q1；Second current amplification unit includes audion Q2；The source electrode of the mos pipes Q1 with
The A electrodes electrical connection of bipolar electrode probe；The B electrodes that the base stage of the audion Q2 is popped one's head in bipolar electrode are electrically connected；This is preferred real
It is p-channel mos pipes to apply the mos pipes in example
The the first signal isolation unit electrically connected with the first current amplification unit；The first signal isolation unit includes the
One photoisolator U8, second resistance R2 and 3rd resistor R3；The signal input terminal of the first photoisolator U8 point
Do not electrically connect with the drain and gate of mos pipe Q1；The grid of the mos pipes Q1 is grounded by 3rd resistor R3；First light
The signal output terminal of electric isolator U8 is grounded GND by second resistance R2；The drain electrode of the mos pipes Q1 and power supply terminal VCC
Electrical connection；
The secondary signal isolated location electrically connected with the second current amplification unit；The secondary signal isolated location includes the
Two photoisolator U9, the 4th resistance R4 and the 5th resistance R5；The signal input terminal of the second photoisolator U9 with
The colelctor electrode electrical connection of audion Q2；The emitter stage of the audion Q2 is electrically connected with the outfan of the second photoisolator U9；
The input terminal of the second photoisolator U9 is grounded by the 5th resistance R5；The grounded emitter GND of the audion Q2；
The outfan of the second photoisolator U9 is electrically connected by the 4th resistance R4 with power supply terminal VCC；
For producing the oscillator unit of reference square wave signal；The oscillator unit includes slide resistor R1, electric capacity
C1, the 4th not gate U4, the 5th not gate U5；The lead-out terminal of the 4th not gate U4 is electrically connected with the input terminal of the 5th not gate U5
Connect；The lead-out terminal of the 5th not gate U5 is electrically connected with the lead-out terminal of the first photoisolator U8；The 4th not gate U4
Input terminal electrically connected with the lead-out terminal of the 5th not gate U5 by electric capacity C1；The input terminal of the 4th not gate U4 passes through
Slide resistor R1 is electrically connected with the lead-out terminal of the 4th not gate U4；
Logical block；The logical block includes the 7th not gate U7 and door U6；The first terminal of the 7th not gate U7 with
Electrically connect with the first input end of door U6；Second input terminal and the outfan of the second photoisolator U9 with door U6
Son electrical connection；It is described to be electrically connected with power supply terminal VCC by the 4th resistance R4 with second input terminal of door U6；
Counting unit；The counting unit includes enumerator and double socket J1；The lead-out terminal and meter with door U6
The clock terminal electrical connection of number device；The lead-out terminal of the enumerator is electrically connected with the input terminal of double socket J1；It is described double
The lead-out terminal of plug socket J1 is electrically connected with alarm signal terminal；The input terminal of the alarm signal terminal and the 7th not gate U7
Electrical connection；The reseting terminal of the enumerator connects reset signal；
And the power supply unit for for above-mentioned each unit providing electric energy.
Hydrophobic coat is scribbled on the housing of the bipolar electrode probe.
The counting unit includes the first enumerator U1, the second enumerator U2 and the 3rd enumerator U3 being sequentially connected in series.
Above preferred embodiment mainly includes：Power supply unit, oscillator unit, the first signal isolation unit, the first electric current
Amplifying unit, the second current amplification unit, secondary signal isolated location, logical block, counter unit.
Power supply unit is oscillator unit, the first signal isolation unit, the first current amplification unit, the second Current amplifier list
Unit, secondary signal isolated location, logical block, counter unit provide power supply.
Oscillator unit provides reference square wave signal for system, preferably：Oscillator unit includes slide resistor R1, electric capacity
C1, the 4th not gate U4, the 5th not gate U5；Said one slide resistor, electric capacity, two not gates constitute RC agitators.
Signal isolation unit is used to carry out oscillator unit and the first current amplification unit signal isolation, improves system
Stability.
Secondary signal isolated location is used to carry out signal isolation to the second current amplification unit and logical block, improves system
Stability, preferred photoelectric isolated chip, electromagnetic isolation chip.
First current amplification unit is used to carry out Current amplifier to the periodic signal that oscillator unit is produced, and improves its driving
Ability, preferred grid tube.
Second current amplification unit is used to carry out Current amplifier to the signal that electrode B is produced, and improves its driving force, preferably
Grid tube.
Logical block is used to provide signal source for counter unit, is constituted with door and a not gate by one.Secondary signal
Isolated location and electrically connect with an input of door, output signal is electrically connected by not gate and with another input of door.
Counter unit is used to count alarm signal, only receives and could be exported after a number of periodic signal
Alarm signal, it is to avoid the disorderly situation of signal occurs when sensor has relative motion with water level.
Fig. 3 is referred to, P0 is the reference square wave signal that agitator is produced, and L1, L2 are two kinds of water level signals, and S1, S2 distinguish
For the primary water level signal that the electrode B of correspondence L1, L2 is produced after Current amplifier and signal isolation, A1, A2 respectively correspondence
The alarm signal of L1, L2 output.Example presented here does not contain reset signal.
Water level signal L1 is directed in figure 3, and S1 results from the square-wave signal of P0 same frequencys after water level changes, works as letter
Number number produces alarm signal when being added to a certain amount of by counter unit, that is, A1 there occurs change.In addition, when A1 is
The signal exported by logical block during high level is low level, and counter number no longer adds up, it is to avoid output signal occurs anti-
Turn.
Water level signal L2 is directed in figure 3, and water level has relative motion with sensor, and breaking occurs in the square-wave signal of correspondence S2
, there is alarm signal in continuous situation, and being added to after certain square-wave signal quantity by enumerator, it is to avoid alarm signal when it is disconnected
When it is continuous the occurrence of.Equally, after there is alarm signal, alarm signal feeds back to counter unit by logical block, keeps away
Exempt from alarm signal disappearance.
Fig. 2 is referred to, Fig. 2 is a kind of preferred circuit in a kind of above-mentioned specific embodiment.Wherein slide resistor R1, electric capacity
C1, phase inverter U4, U5 constitute a kind of preferred circuit of agitator.Photoisolator U8, resistance R2, R3 constitute a kind of isolated location
Preferred circuit.Preferred circuits of the Mos pipes Q1 as current amplification unit 1.A kind of preferred circuit of second current amplification unit is adopted
Use audion Q2.Photoisolator U9, the 4th resistance R4, the 5th resistance R5 constitute a kind of preferred circuit.7th not gate U7 and door
U6 constitutes a kind of preferred circuit of logical block.Enumerator U1, U2, U3 and double socket J1 constitute one kind of counting unit preferably
Circuit.
Embodiments of the invention have been described in detail above, but the content is only presently preferred embodiments of the present invention,
It is not to be regarded as the practical range for limiting the present invention.All impartial changes made according to the present patent application scope and improvement etc.,
All should still belong within the patent covering scope of the present invention.
Claims (4)
1. a kind of ocean water level monitoring level sensor, it is characterised in that：At least include：
Bipolar electrode is popped one's head in；
The first current amplification unit and the second current amplification unit being connected on bipolar electrode probe；Wherein：First electric current
Amplifying unit is managed including mos；Second current amplification unit includes audion；The source electrode of the mos pipes is popped one's head in bipolar electrode
An electrode electrical connection；The base stage of the audion is electrically connected with another electrode that bipolar electrode is popped one's head in；
The the first signal isolation unit electrically connected with the first current amplification unit；The first signal isolation unit includes the first light
Electric isolator, second resistance and 3rd resistor；The signal input terminal of first photoisolator respectively with mos pipes
Drain and gate is electrically connected；The grid of the mos pipes is grounded by 3rd resistor；The signal output of first photoisolator
Terminal is grounded by second resistance；The drain electrode of the mos pipes is electrically connected with power supply terminal；
The secondary signal isolated location electrically connected with the second current amplification unit；The secondary signal isolated location includes the second light
Electric isolator, the 4th resistance and the 5th resistance；The signal input terminal of second photoisolator and the current collection of audion
Pole electrically connects；The emitter stage of the audion is electrically connected with the outfan of the second photoisolator；Second photoisolator
Input terminal pass through the 5th resistance eutral grounding；The grounded emitter of the audion；The outfan of second photoisolator
Electrically connected with power supply terminal by the 4th resistance；
For producing the oscillator unit of reference square wave signal；The oscillator unit includes slide resistor, electric capacity, the 4th non-
Door, the 5th not gate；The lead-out terminal of the 4th not gate is electrically connected with the input terminal of the 5th not gate；5th not gate it is defeated
Go out terminal to electrically connect with the lead-out terminal of the first photoisolator；The input terminal of the 4th not gate is non-with the 5th by electric capacity
The lead-out terminal electrical connection of door；The lead-out terminal electricity that the input terminal of the 4th not gate passes through slide resistor and the 4th not gate
Connection；
Logical block；The logical block includes the 7th not gate and door；The first terminal of the 7th not gate and with door first
Input terminal is electrically connected；It is described to electrically connect with the lead-out terminal of the second photoisolator with the second input terminal of door；It is described with
Second input terminal of door is electrically connected by the 4th resistance with power supply terminal；
Counting unit；The counting unit includes enumerator and double socket；The lead-out terminal with door and enumerator when
Clock terminal is electrically connected；The lead-out terminal of the enumerator is electrically connected with the input terminal of double socket；The double socket it is defeated
Go out terminal to electrically connect with alarm signal terminal；The alarm signal terminal is electrically connected with the input terminal of the 7th not gate；The meter
The reseting terminal of number device connects reset signal；
And the power supply unit for for above-mentioned each unit providing electric energy.
2. ocean water level monitoring level sensor according to claim 1, it is characterised in that：The mos pipes are p-channel
Mos is managed.
3. ocean water level monitoring level sensor according to claim 1, it is characterised in that：The bipolar electrode probe
Hydrophobic coat is scribbled on housing.
4. ocean water level monitoring level sensor according to claim 1, it is characterised in that：The counting unit includes
The first enumerator, the second enumerator and the 3rd enumerator being sequentially connected in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710029563.7A CN106679762B (en) | 2017-01-16 | 2017-01-16 | Water level sensor for monitoring ocean water level |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710029563.7A CN106679762B (en) | 2017-01-16 | 2017-01-16 | Water level sensor for monitoring ocean water level |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106679762A true CN106679762A (en) | 2017-05-17 |
| CN106679762B CN106679762B (en) | 2023-05-23 |
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ID=58859058
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710029563.7A Active CN106679762B (en) | 2017-01-16 | 2017-01-16 | Water level sensor for monitoring ocean water level |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10156580A1 (en) * | 2001-11-20 | 2003-05-28 | Sie Sensorik Ind Elektronik Gm | Oscillator circuit for a capacitive sensor for detecting the presence of an object between an active electrode and earth has a circuit with small signal NPN and PNP transducers that provide improved operating characteristics |
| CN2602408Y (en) * | 2003-01-14 | 2004-02-04 | 耿利平 | Liquid-level automatic controller |
| CN1595075A (en) * | 2004-06-18 | 2005-03-16 | 李虬 | Water level measuring apparatus |
| CN201181229Y (en) * | 2008-04-12 | 2009-01-14 | 雷建军 | Water level monitoring and alarming device |
| CN201662727U (en) * | 2010-04-23 | 2010-12-01 | 王松坡 | Water level monitor device |
| CN202547727U (en) * | 2012-03-01 | 2012-11-21 | 成都智利达科技有限公司 | Multi-purpose water level automatic alarm device |
| CN106128048A (en) * | 2016-07-04 | 2016-11-16 | 国网山东省电力公司博兴县供电公司 | A kind of water-level detecting controls alarm |
-
2017
- 2017-01-16 CN CN201710029563.7A patent/CN106679762B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10156580A1 (en) * | 2001-11-20 | 2003-05-28 | Sie Sensorik Ind Elektronik Gm | Oscillator circuit for a capacitive sensor for detecting the presence of an object between an active electrode and earth has a circuit with small signal NPN and PNP transducers that provide improved operating characteristics |
| CN2602408Y (en) * | 2003-01-14 | 2004-02-04 | 耿利平 | Liquid-level automatic controller |
| CN1595075A (en) * | 2004-06-18 | 2005-03-16 | 李虬 | Water level measuring apparatus |
| CN201181229Y (en) * | 2008-04-12 | 2009-01-14 | 雷建军 | Water level monitoring and alarming device |
| CN201662727U (en) * | 2010-04-23 | 2010-12-01 | 王松坡 | Water level monitor device |
| CN202547727U (en) * | 2012-03-01 | 2012-11-21 | 成都智利达科技有限公司 | Multi-purpose water level automatic alarm device |
| CN106128048A (en) * | 2016-07-04 | 2016-11-16 | 国网山东省电力公司博兴县供电公司 | A kind of water-level detecting controls alarm |
Non-Patent Citations (1)
| Title |
|---|
| 孙岩石;: "CMOS集成电路水位控制器", 电气时代 * |
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| CN106679762B (en) | 2023-05-23 |
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