CN108119317A - A kind of fan blade vibration detection device - Google Patents
A kind of fan blade vibration detection device Download PDFInfo
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- CN108119317A CN108119317A CN201711363977.XA CN201711363977A CN108119317A CN 108119317 A CN108119317 A CN 108119317A CN 201711363977 A CN201711363977 A CN 201711363977A CN 108119317 A CN108119317 A CN 108119317A
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- fan blade
- collector
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D17/00—Monitoring or testing of wind motors, e.g. diagnostics
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The present invention provides a kind of fan blade vibration detection devices, including collector and handheld terminal, the collector, which is screwed, to be installed on fan blade, and the handheld terminal is carried by testing staff, is connected with each other between the collector and the handheld terminal by wireless network.The present invention is for the special working method of fan blade, vibration acquisition device is fixedly installed on fan blade, without often dismantling and not interfering with the normal work of fan blade, when needing detection, vibration acquisition device gathers the vibration data of fan blade in real time, hand-held terminal device is sent to by wireless network and is preserved and is shown, data can also be uploaded to host computer by USB port simultaneously further to analyze and process, reference frame is provided for the improvement of fan blade, meets the special testing requirements of fan blade.
Description
Technical field
The present invention relates to wind-power electricity generation detection technique field, more particularly to a kind of fan blade vibration detection device.
Background technology
With becoming increasingly conspicuous for environmental problem and energy problem, wind energy is as a kind of renewable, free of contamination green energy resource
It has been to be concerned by more and more people.Wind-power electricity generation is to utilize one of principal mode of wind energy.Fan blade is the core of wind turbine
Part, is the important component that wind turbine carries out energy conversion, and the quality of performance directly affects the stabilization and energy of fan operation
The efficiency of conversion.Fan blade in rotary course, when by top go to lower section when, stress change and alternately change and
It is influenced by field wind-force, can all cause the vibration of fan blade.The high vibration of fan blade can cause the generation of crackle, such as
Fruit vibration does not control effectively, it is possible to the fracture failure of entire fan blade is caused, so as to cause huge economic loss.And
It is to be understood that the vibrational state of fan blade, need to be detected it.Due to the special working method of fan blade, using traditional
The method of detection vibration obviously can not be met the requirements.
The content of the invention
(1) the technical issues of solving
To solve the above-mentioned problems, the present invention provides a kind of fan blade vibration detection device, vibration acquisition device is consolidated
Dingan County gathers the vibration data of fan blade, hand-held terminal device is real-time transmitted to by wireless network loaded on fan blade
And preserved and shown, meet the special testing requirements of fan blade.
(2) technical solution
A kind of fan blade vibration detection device, including collector and handheld terminal, the collector is screwed
It is installed on fan blade, the handheld terminal is carried by testing staff, between the collector and the handheld terminal
It is connected with each other by wireless network；
The collector is internally provided with first control circuit plate, the first control circuit plate include vibration detecting unit,
Signal condition unit, the first digital processing element and the first wireless transmission unit；The vibration detecting unit adds for three axis piezoelectricity
Velocity sensor, Vibration Condition when detection blower fan blade rotates export weak voltage signals, are sent into the signal condition list
Member；The signal condition unit includes amplifier section and filtering part, and the amplifier section is by the weak voltage signals through resistance
Anti-rotation, which is changed, to be amplified, and the filtering part filters out the noise signal in voltage signal, conditioned voltage signal after amplification and send
Enter the A/D ALT-CH alternate channels of first digital processing element；First digital processing element handles the data of acquisition,
The data sending handled well is given to the handheld terminal by first wireless transmission unit；
The handheld terminal includes body, and the body front is equipped with liquid crystal display, and the liquid crystal display lower part is set
There is a keyboard, the keyboard is four rows, three row, 12 key board matrix, and the liquid crystal display top is equipped with bi-colour LED, described
Body lower backside is equipped with battery compartment, and the body bottom portion is equipped with USB port, and the bodies top is equipped with radio-frequency antenna；The body
Second control circuit plate is internally provided with, the second control circuit plate includes the second wireless transmission unit, the second digital processing list
Member, indicator unit, display unit, key-press input unit, storage unit and usb communication unit；Second wireless transmission is single
First and described radio-frequency antenna electrical connection, second digital processing element described in second wireless transmission unit reception by adopting
The data of storage transmission are simultaneously handled, while second digital processing element will be adopted by second wireless transmission unit
Collection instruction is sent to the collector, and data that second digital processing element is handled well are sent into the display unit and described
Storage unit；The indicator unit is electrically connected with the bi-colour LED, is used to indicate the handheld terminal and the acquisition
The connection and data of device are transmitted situation；The display unit is electrically connected with the liquid crystal display, by described second
The data that digital processing element is handled well carry out real-time display by the liquid crystal display；The storage unit is to handling well
Data carry out local preservation；The key-press input unit is electrically connected with the keyboard, is modified and is set to test parameter；Institute
It states usb communication unit to be electrically connected with the USB port, second digital processing element is by the usb communication unit by data
It is uploaded to host computer；
The signal condition unit includes the first operational amplifier, second operational amplifier, the 3rd operational amplifier, current potential
Device, the first~the 3rd capacitance and the first~the 9th resistance, wherein first operational amplifier select AD620AN, described second
OP07AN is selected with the 3rd operational amplifier；
The key input unit include keyboard scan chip, keyboard, the first crystal oscillator, the 4th~the 6th capacitance and the tenth~
16th resistance, wherein the keyboard scan chip selects ZLG7289, the keyboard is four rows, three row, 12 key board matrix；
The storage unit includes the resistance of eeprom memory, the 17th and the 18th, wherein the eeprom memory
Select 24C02；
The usb communication unit includes USB interface chip, USB connector, the second crystal oscillator, light emitting diode, the one or two pole
Pipe, the 7th~the 12nd capacitance and the 19th~the 23rd resistance, wherein the USB interface chip selects CH375, described the
12 capacitances are electrolytic capacitor.
Further, the vibration detecting unit selects tri- axis piezoelectric acceleration sensors of Mini-Sensor.
Further, first digital processing element and second digital processing element select microcontroller
MSP430F135。
Further, first wireless transmission unit and second wireless transmission unit select wireless data transmission
Module SV610.
Further, the display unit selects Liquid Crystal Module LCD12864.
Further, the collector is powered using fan power, and the handheld terminal uses lithium battery power supply.
(3) advantageous effect
The present invention provides a kind of fan blade vibration detection devices, for the special working method of fan blade, will shake
Dynamic collector is fixedly installed on fan blade, without often dismantling and not interfering with the normal work of fan blade, works as needs
During detection, vibration acquisition device gathers the vibration data of fan blade in real time, and hand-held terminal device is sent to simultaneously by wireless network
It is preserved and is shown, while can also data be uploaded to by host computer by USB port and further analyzed and processed, be fan blade
Improvement provides reference frame, and apparatus structure is simple, compact, and light weight is cost-effective, low in energy consumption, and accuracy of detection is high,
Reliable operation, wireless transmission are stablized, and the bit error rate is low, using flexible, easily controllable, meets the special testing requirements of fan blade.
Description of the drawings
Fig. 1 is a kind of structure diagram of fan blade vibration detection device according to the present invention.
Fig. 2 is a kind of system functional block diagram of fan blade vibration detection device according to the present invention.
Fig. 3 is a kind of signal condition unit circuit diagram of fan blade vibration detection device according to the present invention.
Fig. 4 is a kind of key input unit circuit diagram of fan blade vibration detection device according to the present invention.
Fig. 5 is a kind of storage unit circuit schematic diagram of fan blade vibration detection device according to the present invention.
Fig. 6 is a kind of usb communication element circuit schematic diagram of fan blade vibration detection device according to the present invention.
Specific embodiment
Embodiment according to the present invention is described in further details below in conjunction with the accompanying drawings.
With reference to Fig. 1 and Fig. 2, a kind of fan blade vibration detection device, including collector 1 and handheld terminal 4, collector 1
It is fixedly installed in by screw 2 on fan blade 3, handheld terminal 4 is carried by testing staff, collector 1 and handheld terminal 4
Between be connected with each other by wireless network；
Collector 1 is internally provided with first control circuit plate, and first control circuit plate includes vibration detecting unit, signal condition
Unit, the first digital processing element and the first wireless transmission unit；Vibration detecting unit is three axis piezoelectric acceleration sensors, is examined
Vibration Condition when fan blade 3 rotates is surveyed, exports weak voltage signals, is sent into signal condition unit；Signal condition unit bag
Amplifier section and filtering part are included, weak voltage signals are amplified by amplifier section through impedance transformation, and filtering part, which filters out, to be put
Noise signal after big in voltage signal, conditioned voltage signal are sent into the A/D ALT-CH alternate channels of the first digital processing element；The
One digital processing element handles the data of acquisition, by the first wireless transmission unit by the data sending handled well to hand
Hold terminal 4；
Handheld terminal 4 includes body, and body front is equipped with liquid crystal display 5, and 5 lower part of liquid crystal display is equipped with keyboard 6, key
Disk 6 is four rows, three row, 12 key board matrix, and 5 top of liquid crystal display is equipped with bi-colour LED 7, and body lower backside is equipped with battery
Storehouse, body bottom portion are equipped with USB port, and bodies top is equipped with radio-frequency antenna 8；Body interior is equipped with second control circuit plate, the second control
Circuit board processed includes the second wireless transmission unit, the second digital processing element, indicator unit, display unit, key-press input list
Member, storage unit and usb communication unit；Second wireless transmission unit and radio-frequency antenna 8 are electrically connected, and the second digital processing element leads to
It crosses the second wireless transmission unit to receive the data that collector 1 is sent and handled, while the second digital processing element passes through the
Acquisition instructions are sent to collector 1 by two wireless transmission units, and it is single that the data that the second digital processing element is handled well are sent into display
Member and storage unit；Indicator unit is electrically connected with bi-colour LED 7, is used to indicate the connection feelings of handheld terminal 4 and collector 1
Condition and data are transmitted situation；Display unit is electrically connected with liquid crystal display 5, the number that the second digital processing element is handled well
Real-time display is carried out according to by liquid crystal display 5；Storage unit carries out local preservation to the data handled well；Key-press input unit
It is electrically connected with keyboard 6, modifies and set to test parameter；Usb communication unit is electrically connected with USB port, the second digital processing
Data are uploaded to host computer by unit by usb communication unit.
Since the particularity of 3 vibration measurement of fan blade is, it is necessary to collector 1 is fixedly mounted on fan blade 3, so right
The selection of vibrating sensor also proposed requirement, should meet low frequency high sensitivity, while also require light weight.Further, it is contemplated that
It is influenced that situation is more complicated be subject to wind-force in the wild to wind turbine, in order to reflect the damage situations of fan blade 3 comprehensively, needs to consider
Three direction stress of three-dimensional Impact direction, i.e. X, Y and Z axis.Therefore vibration detecting unit selects tri- axis piezoelectricity of Mini-Sensor to add
Velocity sensor, up to 1V/g, quality is only 0.5g for sensitivity, and use temperature range is -40~80 DEG C, output weak voltage letter
It is number directly proportional to by measuring acceleration.
The internal resistance of piezoelectric acceleration sensor is very high, and the voltage signal exported is faint, it is therefore desirable to pass through signal tune
It manages unit and carries out impedance conversion by voltage signal amplification and filtering process.As shown in figure 3, signal condition unit includes operation amplifier
Device U1, operational amplifier U2, operational amplifier U3, potentiometer Rw1, capacitance C1~C3 and resistance R1~R9, wherein operation amplifier
Device U1 selects AD620AN, and operational amplifier U2 and U3 select OP07AN.
The function of first data processing unit is mainly the acquisition and transmitting of vibration data, the work(of the second data processing unit
The reception and calculating and the transmission of acquisition instructions of energy mainly vibration data.First digital processing element and the second digital processing
Unit selects microcontroller MSP430F135, is high integration, high-precision system-on-a-chip, has at present in industrial quarters minimum
16 RISC mixed-signal processors of power consumption.With relatively low operating voltage, can be worked normally between 1.8~3.6V.
Its is low in energy consumption, and in activity pattern, operating current is 350uA, in the hibernation mode only 0.5uA.With abundant peripheral hardware, piece
Interior 3 clock signals, flexible clock selecting can make system work under rational clock, significantly reduce system work(
Consumption；10/12 hardware A/D converter has higher conversion rate, reaches as high as 200kbps, meets device data acquisition request；
Liquid crystal up to 160 multistages can be directly driven；Realize 12 D/A conversions of two-way；Hardware I2C serial bus interface realizes memory
Serial Extension；Also there are the peripheral modules such as UART, SPI, more I/O ports and USB controller, enormously simplify peripheral circuit
Design.
First wireless transmission unit and the second wireless transmission unit select wireless data transfer module SV610.SV610 is adopted
With high performance Si4432 radio frequency chips, there is high sensitivity, along with the output power of leading 100mW ensures
Expanded scope and raising link performance.SV610 modules provide multiband channel and network ID to reduce in transmission process
It disturbs to improve transmission performance.There are many SV610 modules, and data transmission rate is optional, and high sensitivity reaches -121dBm, and working frequency range has
The more a Frequency Band Selections of 433/470/868/915MHz, in ecotopia transmission range up to 1400m, operating voltage 2.8~
6.0V, operating temperature range are -20~+70 DEG C.With small, long transmission distance, operating voltage range is wide and programming is set
The characteristics of abundant convenient.MSP430F135 is carried out data transmission by serial ports and SV610 modules.
Display unit selects Liquid Crystal Module LCD12864, carries out real-time display to gathered data, facilitates tester timely
Understand detection case.Tester can be modified and set to test parameter by keyboard 6, such as sample rate, sample reference
Voltage, serial port baud rate etc. are also confirmed by keyboard 6 and establish with the wireless connection of collector 1 and send acquisition to collector 1
Instruction.As shown in figure 4, key input unit includes keyboard scan chip U4, keyboard 6, crystal oscillator X1, capacitance C4~C6 and resistance
R10~R16, wherein keyboard scan chip U4 select ZLG7289, and keyboard 6 is four rows, three row, 12 key board matrix.In ZLG7289
Decoder is contained in portion, has serial line interface, and the repertoire of 6 interface of keyboard, external four rows, three row, 12 key key can be completed in monolithic
Disk matrix, KEY feet can become low level when having by key pressing, and institute's key value can be read using instruction.
The once improper power-off of handheld terminal 4, current gathered data can lose, it is therefore desirable to external memorizer, such as
Shown in Fig. 5, storage unit includes eeprom memory U5, resistance R17 and R18, and wherein eeprom memory U5 selects 24C02.
Handheld terminal 4 carries out local preservation by 24C02 to gathered data, be also convenient for display unit more quickly to gathered data into
Row real-time display.
Gathered data can be also uploaded to host computer by USB port and analysis is further processed by handheld terminal 4, convenient fast
Victory, as shown in fig. 6, usb communication unit include USB interface chip U6, USB connector J1, crystal oscillator X2, Light-emitting diode LED 1,
It is electrolysis electricity that diode D1, capacitance C7~C12 and resistance R9~R23, wherein USB interface chip U6, which select CH375, capacitance C12,
Hold.USB connector J1 is welded to connect with USB port.CH375 supports 3.3V and 5V power supplies, supports full speed USB interface, compatible
USB2.0 agreements；Support a variety of transmission modes；With the built-in firmware pattern and flexible peripheral firmware pattern to save trouble.It is built-in solid
Relevant usb protocol is shielded under part pattern, the USB enumeration process of standard is automatically performed, local controller can be greatly simplified
Firmware handle program.Using 4 line traffic controls：Write gate, read gate, chip select input and interrupt output.MSP430F135 is adopted with CH375
With asynchronous serial communication, capacitance C7, C8 and C12 act on for decoupling, and CH375 interrupts the external interrupt of foot CS# and MSP430F135
Input pin connects, and trailing edge is effective.
The operation principle of the brief description present apparatus：
Link order is inputted by the keyboard 6 of handheld terminal 4 first, handheld terminal 4 and collector 1 is made to establish and wirelessly connect
It connects, bi-colour LED 7 is green at this time, is red if exception is established.When the present apparatus does not work, collector 1 and handheld terminal 4
MSP430F135 be in dormant state, vibrating sensor does not gather vibration data.Need the impaired feelings of detection blower fan blade 3
During condition, the MSP430F135 quilts of acquisition instructions, handheld terminal 4 and collector 1 are started by the input of keyboard 6 of handheld terminal 4
It wakes up, acquisition instructions are sent to collector 1, the MSP430F135 control vibrations of collector 1 by handheld terminal 4 by wireless network
Working sensor gathers the vibration data of fan blade 3, and sample rate, sampling can be changed and set by the keyboard 6 of handheld terminal 4
The test parameters such as reference voltage, serial port baud rate, collector 1 send gathered data to handheld terminal 4, liquid by wireless network
Crystal display screen 5 carries out gathered data real-time display, while handheld terminal 4 carries out gathered data local preservation.Data transmit
Bi-colour LED 7 is green of flashing in the process, and transmission finishes, and stabilizes to green.Handheld terminal 4 can will also be gathered by USB port
Data upload to host computer and further analyze and process.Collector 1 is powered using fan power, and handheld terminal 4 is supplied using lithium battery
Electricity.
The present invention provides a kind of fan blade vibration detection devices, for the special working method of fan blade, will shake
Dynamic collector is fixedly installed on fan blade, without often dismantling and not interfering with the normal work of fan blade, works as needs
During detection, vibration acquisition device gathers the vibration data of fan blade in real time, and hand-held terminal device is sent to simultaneously by wireless network
It is preserved and is shown, while can also data be uploaded to by host computer by USB port and further analyzed and processed, be fan blade
Improvement provides reference frame, and apparatus structure is simple, compact, and light weight is cost-effective, low in energy consumption, and accuracy of detection is high,
Reliable operation, wireless transmission are stablized, and the bit error rate is low, using flexible, easily controllable, meets the special testing requirements of fan blade.
The above-described embodiments are merely illustrative of preferred embodiments of the present invention, not to the structure of the present invention
Think and scope is defined.On the premise of design concept of the present invention is not departed from, ordinary people in the field is to the technology of the present invention
The all variations and modifications that scheme is made, should all drop into protection scope of the present invention, the claimed technology contents of the present invention,
It has all recorded in detail in the claims.
Claims (6)
1. a kind of fan blade vibration detection device, it is characterised in that：Including collector and handheld terminal, the collector passes through
Screw is fixedly installed on fan blade, and the handheld terminal is carried by testing staff, the collector and described hand-held
It is connected with each other between terminal by wireless network；
The collector is internally provided with first control circuit plate, and the first control circuit plate includes vibration detecting unit, signal
Conditioning unit, the first digital processing element and the first wireless transmission unit；The vibration detecting unit is three axis piezoelectric accelerations
Sensor, Vibration Condition when detection blower fan blade rotates export weak voltage signals, are sent into the signal condition unit；Institute
Stating signal condition unit includes amplifier section and filtering part, and the amplifier section is by the weak voltage signals through impedance transformation
It is amplified, the filtering part filters out the noise signal in voltage signal after amplification, described in conditioned voltage signal is sent into
The A/D ALT-CH alternate channels of first digital processing element；First digital processing element handles the data of acquisition, passes through institute
The first wireless transmission unit is stated by the data sending handled well to the handheld terminal；
The handheld terminal includes body, and the body front is equipped with liquid crystal display, and the liquid crystal display lower part is equipped with key
Disk, the keyboard are four rows, three row, 12 key board matrix, and the liquid crystal display top is equipped with bi-colour LED, the body back of the body
Face lower part is equipped with battery compartment, and the body bottom portion is equipped with USB port, and the bodies top is equipped with radio-frequency antenna；The body interior
Equipped with second control circuit plate, the second control circuit plate includes the second wireless transmission unit, the second digital processing element, refers to
Show lamp unit, display unit, key-press input unit, storage unit and usb communication unit；Second wireless transmission unit and institute
Radio-frequency antenna electrical connection is stated, second digital processing element receives the collector by second wireless transmission unit and sends out
The data sent simultaneously are handled, at the same second digital processing element by second wireless transmission unit by acquisition instructions
The collector is sent to, the data that second digital processing element is handled well are sent into the display unit and the storage is single
Member；The indicator unit is electrically connected with the bi-colour LED, is used to indicate the company of the handheld terminal and the collector
It connects situation and data is transmitted situation；The display unit is electrically connected with the liquid crystal display, at the described second number
It manages cell processing good data and real-time display is carried out by the liquid crystal display；The storage unit to the data handled well into
Row is local to be preserved；The key-press input unit is electrically connected with the keyboard, is modified and is set to test parameter；The USB
Communication unit is electrically connected with the USB port, and data are uploaded to by second digital processing element by the usb communication unit
Host computer；
The signal condition unit include the first operational amplifier, second operational amplifier, the 3rd operational amplifier, potentiometer,
First~the 3rd capacitance and the first~the 9th resistance, wherein first operational amplifier selects AD620AN, described second and the
Three operational amplifiers select OP07AN；
The key input unit includes keyboard scan chip, keyboard, the first crystal oscillator, the 4th~the 6th capacitance and the tenth~the tenth
Six resistance, wherein the keyboard scan chip selects ZLG7289, the keyboard is four rows, three row, 12 key board matrix；
The storage unit includes the resistance of eeprom memory, the 17th and the 18th, wherein the eeprom memory is selected
24C02；
The usb communication unit include USB interface chip, USB connector, the second crystal oscillator, light emitting diode, the first diode,
7th~the 12nd capacitance and the 19th~the 23rd resistance, wherein the USB interface chip select CH375, the described tenth
Two capacitances are electrolytic capacitor.
2. a kind of fan blade vibration detection device according to claim 1, it is characterised in that：The vibration detecting unit
Select tri- axis piezoelectric acceleration sensors of Mini-Sensor.
3. a kind of fan blade vibration detection device according to claim 1, it is characterised in that：First digital processing
Unit and second digital processing element select microcontroller MSP430F135.
4. a kind of fan blade vibration detection device according to claim 1, it is characterised in that：First wireless transmission
Unit and second wireless transmission unit select wireless data transfer module SV610.
5. a kind of fan blade vibration detection device according to claim 1, it is characterised in that：The display unit is selected
Liquid Crystal Module LCD12864.
6. a kind of fan blade vibration detection device according to claim 1, it is characterised in that：The collector uses wind
Electromechanical source is powered, and the handheld terminal uses lithium battery power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711363977.XA CN108119317A (en) | 2017-12-18 | 2017-12-18 | A kind of fan blade vibration detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711363977.XA CN108119317A (en) | 2017-12-18 | 2017-12-18 | A kind of fan blade vibration detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108119317A true CN108119317A (en) | 2018-06-05 |
Family
ID=62230115
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711363977.XA Withdrawn CN108119317A (en) | 2017-12-18 | 2017-12-18 | A kind of fan blade vibration detection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108119317A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112504438A (en) * | 2020-12-03 | 2021-03-16 | 河北新武安钢铁集团烘熔钢铁有限公司 | Railway dust removal and under-groove dust removal early warning device |
-
2017
- 2017-12-18 CN CN201711363977.XA patent/CN108119317A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112504438A (en) * | 2020-12-03 | 2021-03-16 | 河北新武安钢铁集团烘熔钢铁有限公司 | Railway dust removal and under-groove dust removal early warning device |
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Application publication date: 20180605 |
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