CN106546519B - A kind of dust accumulation concentration wireless detection device and detection method in ventilation duct - Google Patents
A kind of dust accumulation concentration wireless detection device and detection method in ventilation duct Download PDFInfo
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- CN106546519B CN106546519B CN201610974255.7A CN201610974255A CN106546519B CN 106546519 B CN106546519 B CN 106546519B CN 201610974255 A CN201610974255 A CN 201610974255A CN 106546519 B CN106546519 B CN 106546519B
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- dust
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- sheet
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- 239000000428 dust Substances 0.000 title claims abstract description 107
- 238000009825 accumulation Methods 0.000 title claims abstract description 53
- 238000009423 ventilation Methods 0.000 title claims abstract description 33
- 238000001514 detection method Methods 0.000 title claims abstract description 32
- 230000003287 optical effect Effects 0.000 claims abstract description 57
- 239000000919 ceramic Substances 0.000 claims abstract description 26
- 238000006073 displacement reaction Methods 0.000 claims abstract description 24
- 238000004891 communication Methods 0.000 claims abstract description 15
- 230000004907 flux Effects 0.000 claims description 14
- 239000007921 spray Substances 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 7
- 238000005259 measurement Methods 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 4
- 238000000889 atomisation Methods 0.000 claims description 3
- 238000004378 air conditioning Methods 0.000 abstract description 15
- 238000004140 cleaning Methods 0.000 abstract description 5
- 238000003384 imaging method Methods 0.000 abstract description 3
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 abstract 1
- 230000035508 accumulation Effects 0.000 description 31
- 241000208340 Araliaceae Species 0.000 description 2
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 2
- 235000003140 Panax quinquefolius Nutrition 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 235000008434 ginseng Nutrition 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 241000233866 Fungi Species 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 244000000010 microbial pathogen Species 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
- G01N15/075—Investigating concentration of particle suspensions by optical means
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- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses a kind of dust accumulation concentration wireless detection devices and detection method in ventilation duct, the upper end of shell is equipped with bracket, bracket is equipped with optical transmitting set, pedestal lower end is equipped with fixed dust sheet on the shell, lens are fixed with below dust sheet, optical receiver is equipped with below lens, optical receiver is connect with processor communication, wireless communication module is connected on processor, wireless communication module is connect with wireless receiving and dispatching antenna, and dust sheet and optical receiver are all made of micro positioner and position are adjusted.The present invention carries out Angle-domain imaging to optical receiver and dust sheet using piezo-ceramic micro displacement unit, it is high to control precision, dust sheet can be detected from multiple angles, the accuracy of dust accumulation detection is improved well, laying dust detecting device fixed form of the invention is simple, using reliable, need to only utilize acquisition terminal, the dust accumulation situation in ventilation duct can be connected, at any time so that accurate judgement is made in the cleaning to central air-conditioning.
Description
Technical field
The present invention relates to a kind of dust accumulation concentration wireless detection devices in ventilation duct, belong to the ventilation ducts inner product such as air-conditioning
Dirt detection technique field.
Background technique
Currently, central air-conditioning is extremely prevailing, central air-conditioning be by a host wind crossed by air duct or hot water pipe connect it is more
The mode of a end come control different rooms with reach room air adjust purpose air-conditioning, use air duct blow mode,
It can control multiple and different rooms with a host and fresh air can be introduced, be effectively improved the quality of room air, prevent air-conditioning
The generation of disease.The most outstanding feature of residential central air conditioning is to generate comfortable living environment, secondly from aesthetic standard and best sky
Between utilize upper consideration, keep interior decoration more flexible using residential central air conditioning, it is easier to various decorative effects are realized, even if you are not
Like original decoration, fit up again, central air conditioner system originally slightly changes can be perfect harmony with new finishing.Cause
This residential central air conditioning is referred to as the selection for settling at one go, never falling behind.
But central air-conditioning also has a problem, i.e., dust is more in its air hose, and bacterial fungus is just easy to breed, mesh
Before, for the administration of health of central air-conditioning, country has clearly stipulate that ventilating system should keep cleaning, and no pathogenic microorganisms is dirty
Dye, and clean as requested.And central air-conditioning is more troublesome in cleaning, internal dust accumulation number be also difficult to detect or in advance
It surveys, therefore, it is necessary to the dust accumulations in the ventilation duct to central air-conditioning to detect, to realize the judgement of dust accumulation in ventilation duct, into
And determine when to be cleaned.Although also there are some pipeline laying dust detecting devices at present, detection method is simple,
The problem of testing result differs greatly with practical problem is often led to, the judgement accuracy of internal dust accumulation is influenced.
Summary of the invention
Present invention problem in view of the prior art, provides a kind of dust accumulation concentration wireless detection device in ventilation duct,
Purpose is to improve the accuracy of the detection of dust accumulation in ventilation duct, intends to solve problem of the existing technology.
To achieve the above object, the invention provides the following technical scheme: it is a kind of wireless for the dust accumulation concentration in ventilation duct
Detection device comprising shell, bracket, dust sheet, lens, optical receiver, processor, optical transmitting set, wireless communication module and
Wireless receiving and dispatching antenna, which is characterized in that the upper end of the shell is provided with bracket, and the light is provided on the bracket
Transmitter, the lower end of the bracket are provided with fixed dust sheet on the shell, the lower section fixed setting of the dust sheet
There are lens, the optical receiver, the processing of the optical receiver and setting inside the shell are provided with below the lens
Device communicates to connect, and is also connected on the processor and is provided with wireless communication module, is provided on the wireless communication module
The wireless receiving and dispatching antenna connection, the two sides on the top of the shell are arranged in the wireless receiving and dispatching antenna, described
Dust sheet and optical receiver are all made of micro positioner and position are adjusted.
Further, preferably, the micro positioner uses piezo-ceramic micro displacement unit, the dust sheet uses supporting plate
It is fixed on shell, and is provided with piezo-ceramic micro displacement unit one between supporting plate and shell, the optical receiver uses piezoelectricity
On the shell, the piezo-ceramic micro displacement unit one and piezo-ceramic micro displacement unit two are all made of for the ceramic setting of micro positioner two
The processor is controlled, and spray head is additionally provided on the optical transmitting set, and the spray head is atomization gas spray head, with
Just injection wiping is carried out to dust sheet, the both ends of the dust sheet are respectively arranged with wiping block, one end of the wiping block
It is connected with cylinder piston rod, the cylinder is fixed on shell.
Further, preferably, the shell is fixedly installed sliding block far from one end of optical transmitting set, the sliding block with
It is equipped in ventilation duct, the both ends on the shell positioned at the sliding block, which are respectively arranged with, is fixed on the detection device
Fixation kit in ventilation shaft.
Further, preferably, the fixation kit includes fixed negative pressure pump, fixed plate and fixing sucking disk, described consolidates
Fixed board is fixedly installed on the both ends of the shell, and the upper end of the fixed plate is provided with fixed negative pressure pump, the fixation
Negative pressure pump is connect with the fixing sucking disk, and the lower end of fixed plate is arranged in the fixing sucking disk, the fixing sucking disk
Shape is adapted with the inner wall shape of ventilation shaft.
Further, preferably, the controller is controlled using single-chip microcontroller.
Further, preferably, further including acquisition terminal, the acquisition terminal wirelessly connects with the wireless detection device
It connects, to carry out data processing to the data received.
Further, preferably, the wireless communication module is wirelessly communicated using GPRS.
Further, the present invention provides a kind of methods of the dust accumulation of ventilation duct detection, it is characterised in that: it includes following step
It is rapid:
(1) dust sheet is determined in the case where dustless, and dust sheet is parallel with optical receiver and has that inclination alpha is lower is received
The luminous flux arrived；
(2) ginseng between luminous flux received by dust sheet lower dust accumulation amount parallel with optical receiver and optical receiver is determined
The number table of comparisons, and determine between dust sheet and optical receiver that there is dust accumulation amount and light received by optical receiver under inclination alpha
Parameter lookup table between flux；
(3) dust accumulation for a period of time after, first measure dust sheet it is parallel with optical receiver under, optical receiver actual received arrives
Luminous flux, it is counter to look into its table of comparisons, obtain dust accumulation amount one；
(4) inclination alpha is adjusted using piezo-ceramic micro displacement unit one and piezo-ceramic micro displacement unit one or two, measurement is at this time
The luminous flux that optical receiver actual received arrives, it is counter to look into its table of comparisons, obtain dust accumulation amount two；
(5) dust accumulation amount one and dust accumulation amount two are averaged, obtain dust accumulation amount；
(6) before carrying out next measurement again, dust sheet is cleaned out first with spray head and wiping block.
Compared with prior art, the beneficial effects of the present invention are:
The present invention carries out Angle-domain imaging to optical receiver and dust sheet using piezo-ceramic micro displacement unit, controls precision
Height improves the accuracy of dust accumulation detection, moreover, of the invention in this way, can detect from multiple angles to dust sheet well
Laying dust detecting device fixed form it is simple, using reliable, need to only utilize acquisition terminal, the product in ventilation duct can be connected at any time
Dirt situation, so that accurate judgement is made in the cleaning to central air-conditioning.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram for the dust accumulation concentration wireless detection device in ventilation duct of the invention；
Wherein, 1, shell, 2, bracket, 3, dust sheet, 4, lens, 5, optical receiver, 6, processor, 7, fixed sliding block, 8,
Optical transmitting set, 9, spray head, 10, hose, 11, piezo-ceramic micro displacement unit one, 12, piezo-ceramic micro displacement unit two, 13, cylinder,
14, wireless communication module, 15, wireless receiving and dispatching antenna, 16, wiping block, 17, fixed negative pressure pump, 18, fixed plate, 19, fixed suction
Disk.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Referring to Fig. 1, the present invention provides a kind of technical solution: a kind of dust accumulation concentration radio detection dress in ventilation duct
It sets comprising shell 1, bracket 2, dust sheet 3, lens 4, optical receiver 5, processor 6, optical transmitting set 8, wireless communication module 14
With wireless receiving and dispatching antenna 15, which is characterized in that the upper end of the shell 1 is provided with bracket 2, is provided on the bracket 2
The optical transmitting set 8, the lower end of the bracket 2 are provided with the dust sheet 3 being fixed on shell 1, the dust sheet 3
Lower section is fixedly installed lens 4, and the lower section of the lens 4 is provided with the optical receiver 5, the optical receiver 5 with set
The processor 6 set in shell 1 communicates to connect, and is also connected on the processor 6 and is provided with wireless communication module 14, described
It is provided with the wireless receiving and dispatching antenna 15 on wireless communication module 14 to connect, the wireless receiving and dispatching antenna 15 is arranged described
Shell 1 top two sides, the dust sheet and optical receiver are all made of micro positioner and position are adjusted.
In the present embodiment, the micro positioner uses piezo-ceramic micro displacement unit, and the dust sheet is solid using supporting plate
Due to being provided with piezo-ceramic micro displacement unit 1 on shell, and between supporting plate and shell, the optical receiver uses piezoelectricity
Ceramic micro positioner 2 12 is arranged on the shell, the piezo-ceramic micro displacement unit 1 and piezo-ceramic micro displacement unit 2 12
It is all made of the processor 6 to be controlled, spray head 9 is additionally provided on the optical transmitting set, the spray head 9 is atomization gas
Body spray head, to carry out injection wiping to dust sheet, the both ends of the dust sheet are respectively arranged with wiping block 16, the wiping
One end of boss 16 is connected with 13 piston rod of cylinder, and the cylinder 13 is fixed on shell.
Wherein, the shell is fixedly installed sliding block 7 far from one end of optical transmitting set, in the sliding block 7 and ventilation duct
It is equipped with, the both ends on the shell 1 positioned at the sliding block, which are respectively arranged with, is fixed on ventilation duct for the detection device
Fixation kit in road.The fixation kit includes fixed negative pressure pump 17, fixed plate 18 and fixing sucking disk 19, the fixed plate
18 are fixedly installed on the both ends of the shell 1, and the upper end of the fixed plate 18 is provided with fixed negative pressure pump 17, and described consolidates
Determine negative pressure pump 17 to connect with the fixing sucking disk 19, the lower end of fixed plate 18 is arranged in the fixing sucking disk 19, described
The shape of fixing sucking disk is adapted with the inner wall shape of ventilation shaft.The controller is controlled using single-chip microcontroller.
In addition, the acquisition terminal and the wireless detection device are wirelessly connected the invention also includes acquisition terminal, so as to
Data processing is carried out to the data received.The wireless communication module is wirelessly communicated using GPRS.
The present invention provides a kind of dust accumulation of ventilation duct detection method, it is characterised in that: itself the following steps are included:
(1) dust sheet is determined in the case where dustless, and dust sheet is parallel with optical receiver and has that inclination alpha is lower is received
The luminous flux arrived；
(2) ginseng between luminous flux received by dust sheet lower dust accumulation amount parallel with optical receiver and optical receiver is determined
The number table of comparisons, and determine between dust sheet and optical receiver that there is dust accumulation amount and light received by optical receiver under inclination alpha
Parameter lookup table between flux；
(3) dust accumulation for a period of time after, first measure dust sheet it is parallel with optical receiver under, optical receiver actual received arrives
Luminous flux, it is counter to look into its table of comparisons, obtain dust accumulation amount one；
(4) inclination alpha is adjusted using piezo-ceramic micro displacement unit one and piezo-ceramic micro displacement unit one or two, measurement is at this time
The luminous flux that optical receiver actual received arrives, it is counter to look into its table of comparisons, obtain dust accumulation amount two；
(5) dust accumulation amount one and dust accumulation amount two are averaged, obtain dust accumulation amount；
(6) before carrying out next measurement again, dust sheet is cleaned out first with spray head and wiping block.
Compared with prior art, the beneficial effects of the present invention are:
The present invention carries out Angle-domain imaging to optical receiver and dust sheet using piezo-ceramic micro displacement unit, controls precision
Height improves the accuracy of dust accumulation detection, moreover, of the invention in this way, can detect from multiple angles to dust sheet well
Laying dust detecting device fixed form it is simple, using reliable, need to only utilize acquisition terminal, the product in ventilation duct can be connected at any time
Dirt situation, so that accurate judgement is made in the cleaning to central air-conditioning.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (5)
1. a kind of method that the dust accumulation concentration wireless detection device in ventilation duct detects the dust accumulation of ventilation duct, special
Sign is: the following steps are included:
(1) dust sheet is determined in the case where dustless, and dust sheet is parallel with optical receiver and with received under inclination alpha
Luminous flux；
(2) parameter pair between luminous flux received by dust sheet lower dust accumulation amount parallel with optical receiver and optical receiver is determined
According to table, and determine between dust sheet and optical receiver that there is dust accumulation amount and luminous flux received by optical receiver under inclination alpha
Between parameter lookup table；
(3) dust accumulation for a period of time after, first measure dust sheet it is parallel with optical receiver under, light that optical receiver actual received arrives leads to
Amount, it is counter to look into its table of comparisons, obtain dust accumulation amount one；
(4) inclination alpha is adjusted using piezo-ceramic micro displacement unit one and piezo-ceramic micro displacement unit two, measures light-receiving at this time
The luminous flux that device actual received arrives, it is counter to look into its table of comparisons, obtain dust accumulation amount two；
(5) dust accumulation amount one and dust accumulation amount two are averaged, obtain dust accumulation amount；
(6) before carrying out next measurement again, dust sheet is cleaned out first with spray head and wiping block；
The wireless detection device includes shell, bracket, dust sheet, lens, optical receiver, processor, optical transmitting set, channel radio
Letter module and wireless receiving and dispatching antenna, the upper end of the shell are provided with bracket, and the light hair is provided on the bracket
Emitter, the lower end of the bracket are provided with fixed dust sheet on the shell, are fixedly installed below the dust sheet
Lens are provided with the optical receiver, the processor of the optical receiver and setting inside the shell below the lens
It communicates to connect, is also connected on the processor and is provided with wireless communication module, the wireless communication module and the nothing
The connection of line dual-mode antenna, the wireless receiving and dispatching antenna are arranged in the two sides on the top of the shell, the dust sheet and
Optical receiver is all made of micro positioner and position is adjusted；
The micro positioner uses piezo-ceramic micro displacement unit, and the dust sheet is fixed on shell using supporting plate, and supporting plate
Piezo-ceramic micro displacement unit one is provided between shell, the optical receiver is arranged using piezo-ceramic micro displacement unit two
On shell, the piezo-ceramic micro displacement unit one and piezo-ceramic micro displacement unit two are all made of the processor and are controlled
It makes, spray head is additionally provided on the optical transmitting set, the spray head is atomization gas spray head, to spray dust sheet
Wiping, the both ends of the dust sheet are respectively arranged with wiping block, and one end of the wiping block is connected with cylinder piston
Bar, the cylinder are fixed on shell；
The shell is fixedly installed sliding block far from one end of optical transmitting set, is equipped in the sliding block and ventilation duct, institute
Both ends on the shell stated positioned at the sliding block are respectively arranged with the fixation group being fixed on the detection device in ventilation shaft
Part.
2. a kind of dust accumulation concentration wireless detection device in ventilation duct described in claim 1 carries out the dust accumulation of ventilation duct
The method of detection, it is characterised in that: the fixation kit includes fixed negative pressure pump, fixed plate and fixing sucking disk, the fixation
Plate is fixedly installed on the both ends of the shell, and the upper end of the fixed plate is provided with fixed negative pressure pump, and the fixation is negative
Press pump is connect with the fixing sucking disk, and the lower end of fixed plate, the shape of the fixing sucking disk is arranged in the fixing sucking disk
Shape is adapted with the inner wall shape of ventilation shaft.
3. a kind of dust accumulation concentration wireless detection device in ventilation duct described in -2 any one is to logical according to claim 1
The method that the dust accumulation of air hose is detected, it is characterised in that: the controller is controlled using single-chip microcontroller.
4. a kind of dust accumulation concentration wireless detection device in ventilation duct described in -2 any one is to logical according to claim 1
The method that the dust accumulation of air hose is detected, it is characterised in that: it further include acquisition terminal, the acquisition terminal and the radio detection
Device is wirelessly connected, to carry out data processing to the data received.
5. a kind of dust accumulation concentration wireless detection device in ventilation duct described in -2 any one is to logical according to claim 1
The method that the dust accumulation of air hose is detected, it is characterised in that: the wireless communication module is wirelessly communicated using GPRS.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610974255.7A CN106546519B (en) | 2016-11-07 | 2016-11-07 | A kind of dust accumulation concentration wireless detection device and detection method in ventilation duct |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610974255.7A CN106546519B (en) | 2016-11-07 | 2016-11-07 | A kind of dust accumulation concentration wireless detection device and detection method in ventilation duct |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106546519A CN106546519A (en) | 2017-03-29 |
| CN106546519B true CN106546519B (en) | 2019-02-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610974255.7A Active CN106546519B (en) | 2016-11-07 | 2016-11-07 | A kind of dust accumulation concentration wireless detection device and detection method in ventilation duct |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113294881B (en) * | 2021-05-25 | 2022-09-06 | 中建三局集团(深圳)有限公司 | Air conditioner air duct dust accumulation amount monitoring system and method with early warning function |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101221110A (en) * | 2008-01-23 | 2008-07-16 | 北京拂尘龙科技发展有限公司 | Air conduit laying dust detector, automatic laying dust detecting device and method |
| CN202471015U (en) * | 2012-03-01 | 2012-10-03 | 北京建龙重工集团有限公司 | Deposited dust detection device |
| CN102829848A (en) * | 2012-08-06 | 2012-12-19 | 无锡科之乾科技有限公司 | Remote monitoring system and detection method for particulate depositing quantity |
| CN204314231U (en) * | 2015-01-16 | 2015-05-06 | 国家电网公司 | Communication apparatus air inlet filter screen laying dust detection system |
-
2016
- 2016-11-07 CN CN201610974255.7A patent/CN106546519B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101221110A (en) * | 2008-01-23 | 2008-07-16 | 北京拂尘龙科技发展有限公司 | Air conduit laying dust detector, automatic laying dust detecting device and method |
| CN202471015U (en) * | 2012-03-01 | 2012-10-03 | 北京建龙重工集团有限公司 | Deposited dust detection device |
| CN102829848A (en) * | 2012-08-06 | 2012-12-19 | 无锡科之乾科技有限公司 | Remote monitoring system and detection method for particulate depositing quantity |
| CN204314231U (en) * | 2015-01-16 | 2015-05-06 | 国家电网公司 | Communication apparatus air inlet filter screen laying dust detection system |
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| CN106546519A (en) | 2017-03-29 |
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