CN206783390U - The automatic detection and control device of a kind of BAF - Google Patents
The automatic detection and control device of a kind of BAF Download PDFInfo
- Publication number
- CN206783390U CN206783390U CN201720565609.2U CN201720565609U CN206783390U CN 206783390 U CN206783390 U CN 206783390U CN 201720565609 U CN201720565609 U CN 201720565609U CN 206783390 U CN206783390 U CN 206783390U
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- Prior art keywords
- magnetic valve
- baf
- backwash
- plc
- online
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000001514 detection method Methods 0.000 title claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 102
- 238000005273 aeration Methods 0.000 claims abstract description 35
- 239000001301 oxygen Substances 0.000 claims abstract description 29
- MYMOFIZGZYHOMD-UHFFFAOYSA-N oxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims abstract description 29
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 29
- 238000005429 turbidity Methods 0.000 claims abstract description 12
- 238000001914 filtration Methods 0.000 claims description 17
- 239000010865 sewage Substances 0.000 claims description 16
- 239000000706 filtrate Substances 0.000 claims description 4
- 230000003020 moisturizing Effects 0.000 claims description 3
- 238000000746 purification Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 22
- 230000000052 comparative effect Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 7
- 244000005700 microbiome Species 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000002910 solid waste Substances 0.000 description 4
- 238000011001 backwashing Methods 0.000 description 3
- 241000208340 Araliaceae Species 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000005035 ginseng Nutrition 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000004807 localization Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
Classifications
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
A kind of automatic checkout and control system device of BAF of the utility model, detection means include online water level detection gauge, online transmissometer and online dissolved oxygen instrument；Control device includes PLC and the computer being connected with each other, the voice operated sensor being connected with PLC, the electric proportion magnetic valve being connected with voice operated sensor, and water inlet adjustment module, air compressor control module, solenoid valve control module, the backwash control module being also connected respectively with PLC；The electric proportion magnetic valve of automatic detection device and control device is connected with each other, and its automatic detection is controlled by PLC and computer.The present apparatus is by constantly detecting water level, turbidity and the dissolved oxygen concentration in filter tank, and detection data are transmitted to computer, by computer compared with process set value, according to comparative result, start control device to be controlled the flow of inlet water and aeration in filter tank, automaticity is high, and aeration is uniform, ensures that BAF is run steadily in the long term.
Description
Technical field
Sewage treatment area is the utility model is related to, the BAF specifically controlled based on PLC and computer
Automatic detection and control device.
Background technology
At present, the most manual controls single in a kind of very simple function of the control of domestic BAF
System, aspect is being automatically controlled, sewage plant uses programmable logic controller (PLC) both at home and abroad at present（PLC）It is relatively broad, the system
Collecting and distributing control can be achieved, system is stable, easy to operate etc.；But PLC functions in terms of real-time monitoring are no comprehensively perfect, in order to carry
High BAF automaticity and make aeration uniform, it is also necessary to constantly improve.
Utility model content
The purpose of this utility model is that providing a kind of BAF controlled based on PLC and computer is automatically controlled
With control device, can be achieved to BAF sewage purification, the Detection ＆ Controling of filter process.
In order to achieve the above object, the utility model takes following technical scheme：
A kind of automatic checkout and control system device of BAF, including BAF processing unit, with
Prior art it is not existing be：Also include the automatic detection device and control dress being connected respectively with BAF processing unit
Put；
The automatic detection device includes being located at the online water level inspection of BAF processing unit upper critical position
Instrument, online transmissometer and online dissolved oxygen instrument are surveyed, detects water level, turbidity and the dissolving of BAF processing unit respectively
Oxygen concentration；
The control device, automatically controlled for the flow of inlet water to BAF processing unit and aeration；
It includes PLC and the computer being connected with each other, and the voice operated sensor being connected with PLC and voice operated sensor connect
The electric proportion magnetic valve connect, and be also connected respectively with PLC water inlet adjustment module, air compressor control mould
Block, solenoid valve control module, backwash control module；
Online water level detection gauge, online transmissometer and the online dissolved oxygen instrument of the automatic detection device fill with control respectively
The electric proportion magnetic valve put is connected with each other, and its automatic detection is controlled by PLC and computer.
The BAF processing unit is prior art, including distribution channel, sewage water inlet pipe magnetic valve, is supported
Area, aeration zone, water pump, backwash water inlet pipe magnetic valve, backwash water inlet pipe, filter plate, unidirectional gas blow pipe, backwash air inlet pipe,
Motor, air compressor, backwash air inlet pipe electromagnetism, aeration tube, aeration tube magnetic valve, filtrate, outlet pipe, outlet pipe electromagnetism
Valve, backwash outlet pipe magnetic valve, backwash drainpipe, filtering baffle etc..
The utility model BAF processing unit and prior art it is not existing be：Set in filter tank upper critical position
There are online water level detection gauge, online transmissometer, online dissolved oxygen instrument；Filtrate uses filter block, realizes the mesh such as purification, the filtering of sewage
's.Filter block is existing product, and filtrate is done with it, can simplify filter tank internal structure, and by changing the density of filter block, it is net to improve filter tank
Change degree.
The voice operated sensor outgoing signal controls connected audio-switch work, is controlled by PLC.
The online water level detection gauge, constantly detects the working water level in filter tank, and water level information is transmitted into computer, with meter
Process set value in calculation machine is compared.
The online dissolved oxygen instrument, the dissolved oxygen concentration in water is detected, by computer compared with process set value, control
Air inflow caused by air compressor processed, ensure that filter tank maintains the state of an efficient stable.
The online transmissometer, for detecting the turbidity of water outlet, after a period of time is filtered, the decomposition filtering of microorganism
Caused solid waste can accumulate, and as normal water outlet is discharged and is attached to filter material surface, the filtering to microorganism has an impact,
So to close normal filtration afterwards to a certain degree with reaching in line transmissometer detection turbidity, backwash process is carried out.Transmissometer is examined
The data of survey are the foundations for the cycle of operation for determining filter tank.
The motor and water pump of the BAF processing unit are connected with its drive circuit respectively, drive circuit with
PLC connects；Motor is connected with air compressor, for being aerated；Water pump is controlled by PLC or manual control, leads to
The control for crossing magnetic valve is supplied water to distribution channel or backwash process respectively.
The water inlet adjustment module, the balance of Inlet and outlet water during for adjusting filter tank normal filtration, using voice operated sensor come
The startup of magnetic valve is controlled, makes online water level detection gauge in running order and water level is detected；If detecting, water level is believed
Number when setting below water level, open intake pump and give distribution channel moisturizing, open sewage water inlet pipe electromagnetism valve supply water, close backwash
Outlet pipe magnetic valve, filter water is allowed to be discharged from outlet pipe.
The air compressor control module includes connected air compressor, is controlled by PLC.With
To adjust the change of dissolved oxygen in the running of filter tank.Air compressor works under motor driving, is mainly used to be aerated
The size of VFC air quantity and the regulation to aeration quantity are realized, opens aeration tube magnetic valve to supporting needed for area's offer, meanwhile,
Close backwash air inlet pipe magnetic valve.The startup of magnetic valve is controlled by audio-switch, online dissolved oxygen instrument is in work
State simultaneously surveys the dissolved oxygen of biofilter compared with process set value, if surveyed dissolved oxygen meets technological requirement, no
Change the running frequency of existing air compressor；Conversely, then realize that speed governing is at by the frequency conversion function of air compressor
In energy-efficient running status until dissolved oxygen meets technological requirement in reaching pond.
The solenoid valve control module include connected sewage water inlet pipe magnetic valve, backwash water inlet pipe magnetic valve,
Outlet pipe magnetic valve, aeration tube magnetic valve, backwash air inlet pipe magnetic valve are backwashed, is controlled by PLC.
The backwash control module includes connected backwash water inlet pipe magnetic valve, backwash water inlet pipe, recoil
Air inlet pipe, backwash air inlet pipe magnetic valve are washed, outlet pipe magnetic valve is backwashed, drainpipe is backwashed, by by PLC
It is controlled.
The air compressor, is supplied in aeration process and backwash process, meanwhile, realized by its frequency conversion function
Aeration quantity is adjusted.
The aeration is inflated by unidirectional gas tube, and mainly aeration is uniform.
The filter for a period of time after, microorganism by filter block decompose filtering caused by solid waste can be with normal
Water outlet is discharged and is attached to filter block surface, and the filtering to microorganism is had an impact, and opening for magnetic valve is controlled using audio-switch
It is dynamic, make in running order in line transmissometer and water quality is carried out detecting turbidity reaching to close normal filtration afterwards to a certain degree,
Carry out backwash process.Delivery turbidity is not up to technique Expected Results in ordinary circumstance BAF running, then says
Bright filter tank needs to backwash, and the judgement of filter back washing end of run is mainly according to filter tank water inlet water level or effluent quality index.
Need to close sewage water inlet pipe magnetic valve and aeration tube magnetic valve in backwash process, while open water pump, backwash water inlet pipe electricity
Magnet valve, backwash water inlet pipe, and open backwash outlet pipe magnetic valve and backwashed.
The automatic detection and control device of the utility model BAF, by being located at filter tank upper critical position
Online water level detection gauge, online transmissometer and online dissolved oxygen instrument, water level, turbidity and the dissolved oxygen for constantly detecting filter tank are dense
Degree, and detection data are transmitted to computer, by computer compared with process set value, according to comparative result, start control
Device, Inlet and outlet water, air compressor control module regulation aeration quantity, and backwash control mould are adjusted by adjustment module of intaking
Block is backwashed.With water level of intaking, delivery turbidity joint-monitoring and in this, as the judgement of BAF end of run
Foundation.With real-time monitoring, real-time data acquisition and the control system adjusted in real time, major control, area of computer aided are done with PLC
The system of control.Sewage disposal energy consumption is reduced by converter technique, controls dissolved oxygen again to reach the stabilization of BAF
Operation.Meanwhile accurate judgement backwashing period and it can be carried out automatically according to the effluent quality and level condition of BAF
Backwash operation.Technical process emulated interface can conveniently be browsed by man-machine working interface；Show various on-line checking instrument ginsengs
Numerical value, various equipment operation conditions simultaneously can carry out start stop operation to all devices；With powerful data processing, form, beat
The functional advantages such as print, alarm, real-time curve and history curve.Collecting and distributing control can be achieved, system is stable, and performance is good, and exploitation is safeguarded
It is simple and easy to operate etc..
The perfect processing function of BAF of the utility model device, automaticity is high, and aeration is uniform, ensures
BAF is run steadily in the long term.
Brief description of the drawings
Fig. 1 is the structural representation of the utility model device；
Fig. 2 is the structural representation of the utility model BAF processing unit.
In figure, the sewage water inlet pipe magnetic valve 4. of 1. BAF processing unit, 2. distribution channel 3. supports area
5. the water pump 8. of 6. support frame of aeration zone 7. backwash water inlet pipe magnetic valve 9. backwashes the filter plate of water inlet pipe 10.
11. unidirectional gas tube 12. backwashes the air compressor 15. of 13. motor of air inlet pipe 14. and backwashes air inlet pipe magnetic valve
16. the recoil of the outlet pipe magnetic valve 21. of 19. outlet pipe of aeration tube 17. aeration tube magnetic valve, 1.8 filter block 20. washes out
Water solenoid valve 22. backwashes online 24. filtering baffle of transmissometer, the 25. online dissolved oxygen instrument 26. of drainpipe 23.
Online liquid level surveys instrument.
Embodiment
The utility model content is further described with reference to embodiment and accompanying drawing, but is not to the utility model
Restriction.
Embodiment
Referring to Figures 1 and 2, the automatic checkout and control system device of a kind of BAF, including aeration and biological filter
Pond processing unit 1, the automatic detection device and control device being connected respectively with BAF processing unit 1；
The automatic detection device includes being located at the online water level detecting of 1 critical localisation of BAF processing unit
Instrument 26, online transmissometer 23, online dissolved oxygen instrument 25, the water level of BAF processing unit 1, turbidity and molten are detected respectively
Solve oxygen concentration；
The control device, for being automatically controlled to the flow of inlet water of BAF processing unit 1 and aeration；Its
PLC and computer including interconnection, the voice operated sensor being connected with PLC, it is connected with voice operated sensor
Electric proportion magnetic valve, and be also connected respectively with PLC water inlet adjustment module, air compressor control module,
Solenoid valve control module, backwash control module；
The online water level detection gauge 26 of the automatic detection device, online transmissometer 23, online dissolved oxygen instrument 25 respectively with
The electric proportion magnetic valve of control device is connected with each other, and its automatic detection is controlled by PLC and computer.
The present embodiment BAF processing unit 1 includes distribution channel 2, sewage water inlet pipe magnetic valve 3, supports area 4, exposes
It is gas area 5, support frame 6, water pump 7, backwash water inlet pipe magnetic valve 8, backwash water inlet pipe 9, filter plate 10, unidirectional gas blow pipe 11, anti-
Rinse air inlet pipe 12, motor 13, air compressor 14, backwash air inlet pipe electromagnetism 15, aeration tube 16, aeration tube magnetic valve 17,
Filter block 18, outlet pipe 19, outlet pipe magnetic valve 20, backwash outlet pipe magnetic valve 21, backwash drainpipe 22, filtering baffle 24
Deng.
The present embodiment BAF processing unit：The upper critical position of filter tank 1 be provided with online water level detection gauge 26,
Online transmissometer 23, online dissolved oxygen instrument 25.
The voice operated sensor outgoing signal controls connected audio-switch work, is controlled by PLC.
The motor 13 and water pump 7 of the BAF processing unit 1 are connected with its drive circuit respectively, drive circuit
It is connected with PLC；Motor 13 is connected with air compressor 14, for being aerated；Water pump 7 is by PLC control or artificial
Control, distribution channel 2 or backwash process are supplied water respectively by the control of magnetic valve.
The water inlet adjustment module, the balance of Inlet and outlet water during for adjusting 1 normal filtration of filter tank, using voice operated sensor come
The startup of magnetic valve is controlled, makes online water level detection gauge 26 in running order and water level is detected；If detect water level
Signal opens intake pump 7 and gives the moisturizing of distribution channel 2 when setting below water level, opens sewage water inlet pipe magnetic valve 3 and supplies water, closes
Outlet pipe magnetic valve 21 is backwashed, allows filter water to be discharged from outlet pipe 19.
The air compressor control module includes connected air compressor 14, is controlled by PLC.
For adjusting the change of dissolved oxygen in the running of filter tank 1.Air compressor 14 works under the driving of motor 13, main to use
To be aerated the size for realizing VFC air quantity and the regulation to aeration quantity, aeration tube magnetic valve 17 is opened to supporting area 4 to provide
It is required, meanwhile, close backwash air inlet pipe magnetic valve 15.The startup of magnetic valve is controlled by audio-switch, makes to dissolve online
Oxygen instrument 25 is in running order and surveys the dissolved oxygen of biofilter 1 compared with process set value, if surveyed dissolved oxygen accords with
Technological requirement is closed, then does not change the running frequency of existing air compressor 14；Conversely, then pass through the frequency conversion work(of air compressor 14
It can realize that speed governing is in energy-efficient running status until dissolved oxygen meets technological requirement in reaching pond.
The solenoid valve control module includes connected sewage water inlet pipe magnetic valve 2, backwash water inlet pipe magnetic valve
8th, outlet pipe magnetic valve 21, aeration tube magnetic valve 17, backwash air inlet pipe magnetic valve 15 are backwashed, is carried out by PLC
Control.
The backwash control module includes connected backwash water inlet pipe magnetic valve 8, backwashes water inlet pipe 9, be anti-
Air inlet pipe 12, backwash air inlet pipe magnetic valve 15 are rinsed, backwash outlet pipe magnetic valve 21, drainpipe 22 is backwashed, by equal
It is controlled by PLC.
The air compressor 14, is supplied in aeration process and backwash process, meanwhile, it is real by its frequency conversion function
Now aeration quantity is adjusted.
The aeration inflates 11 by unidirectional gas tube, and mainly aeration is uniform.
After a period of time is filtered in the filter tank 1, microorganism decomposes solid waste caused by filtering by filter block 18 can be with
The surface of filter block 18 is discharged and is attached in normal water outlet, and the solid waste being attached on filter block 18 has an impact to filtering, utilizes sound
Control switch controls the startup of magnetic valve, makes the online transmissometer 23 in running order and water quality is carried out detecting turbidity to reach one
Normal filtration is closed after determining degree, carries out backwash process.Delivery turbidity in ordinary circumstance BAF running
Not up to technique Expected Results, then illustrate that filter tank needs to backwash, the judgement of filter back washing end of run is mainly according to filter tank
Water inlet water level or effluent quality index.Need to close sewage water inlet pipe magnetic valve 3 and aeration tube magnetic valve 17 in backwash process, together
When open water pump 7, backwash water inlet pipe magnetic valve 8, backwash water inlet pipe 9, and open backwash outlet pipe magnetic valve 21 and enter
Row backwash.
The perfect processing function of BAF of the present embodiment device, automaticity is high, and aeration is uniform, ensures to expose
Run steadily in the long term gas biofilter.
Claims (6)
1. a kind of automatic checkout and control system device of BAF, including BAF processing unit, it is special
Sign is：Also include the automatic detection device and control device being connected respectively with BAF processing unit；
The automatic detection device include be located at BAF processing unit upper critical position online water level detection gauge,
Online transmissometer and online dissolved oxygen instrument, water level, turbidity and the dissolved oxygen for detecting BAF processing unit respectively are dense
Degree；
The control device, automatically controlled for the flow of inlet water to BAF processing unit and aeration, it is wrapped
Include the PLC and computer of interconnection, the voice operated sensor being connected with PLC, be connected with voice operated sensor
Electric proportion magnetic valve, and be also connected respectively with PLC water inlet adjustment module, air compressor control module, electricity
Magnet valve control module, backwash control module；
Online water level detection gauge, online transmissometer and the online dissolved oxygen instrument of the automatic detection device respectively with control device
Electric proportion magnetic valve is connected with each other, and its automatic detection is controlled by PLC and computer.
2. the automatic checkout and control system device of BAF according to claim 1, it is characterised in that：
The filtrate of the BAF processing unit uses filter block, realizes purification, the purpose of filtering of sewage.
3. the automatic checkout and control system device of BAF according to claim 1, it is characterised in that：
The water inlet adjustment module, the balance of Inlet and outlet water, is controlled using voice operated sensor during for adjusting filter tank normal filtration
The startup of magnetic valve, make online water level detection gauge in running order and water level is detected；If detecting, water level signal exists
When setting below water level, moisturizing.
4. the automatic checkout and control system device of BAF according to claim 1, it is characterised in that：
The air compressor control module includes connected air compressor, is controlled by PLC.
5. the automatic checkout and control system device of BAF according to claim 1, it is characterised in that：
The solenoid valve control module includes connected sewage water inlet pipe magnetic valve, backwash water inlet pipe magnetic valve, recoil
Water solenoid valve, aeration tube magnetic valve, backwash air inlet pipe magnetic valve are washed out, is controlled by PLC.
6. according to the automatic checkout and control system device of the BAF described in claim 1, it is characterised in that：
The backwash control module include connected backwash water inlet pipe magnetic valve, backwash water inlet pipe, backwash into
Tracheae, backwash air inlet pipe magnetic valve, backwash outlet pipe magnetic valve, backwash drainpipe, carried out by by PLC
Control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720565609.2U CN206783390U (en) | 2017-05-21 | 2017-05-21 | The automatic detection and control device of a kind of BAF |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720565609.2U CN206783390U (en) | 2017-05-21 | 2017-05-21 | The automatic detection and control device of a kind of BAF |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206783390U true CN206783390U (en) | 2017-12-22 |
Family
ID=60712493
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720565609.2U Expired - Fee Related CN206783390U (en) | 2017-05-21 | 2017-05-21 | The automatic detection and control device of a kind of BAF |
Country Status (1)
| Country | Link |
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| CN (1) | CN206783390U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107010717A (en) * | 2017-05-21 | 2017-08-04 | 桂林理工大学 | The automatic detection and control device of a kind of BAF |
| CN108279568A (en) * | 2017-12-29 | 2018-07-13 | 浙江中控软件技术有限公司 | Boundary position control method for Variable Composition slot |
| CN109650533A (en) * | 2019-02-26 | 2019-04-19 | 中持水务股份有限公司 | Biological aerated filter using filter block and the method for treating water using the biological aerated filter |
| CN110510729A (en) * | 2019-08-14 | 2019-11-29 | 中国石油天然气集团有限公司 | Cleaning control method, system and corresponding moving bed biological filter tank reactor assembly |
-
2017
- 2017-05-21 CN CN201720565609.2U patent/CN206783390U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107010717A (en) * | 2017-05-21 | 2017-08-04 | 桂林理工大学 | The automatic detection and control device of a kind of BAF |
| CN108279568A (en) * | 2017-12-29 | 2018-07-13 | 浙江中控软件技术有限公司 | Boundary position control method for Variable Composition slot |
| CN108279568B (en) * | 2017-12-29 | 2021-06-29 | 浙江中控软件技术有限公司 | Interface control method for variable concentration tank |
| CN109650533A (en) * | 2019-02-26 | 2019-04-19 | 中持水务股份有限公司 | Biological aerated filter using filter block and the method for treating water using the biological aerated filter |
| CN109650533B (en) * | 2019-02-26 | 2022-05-31 | 中持水务股份有限公司 | Biological aerated filter adopting filter bricks and water treatment method using biological aerated filter |
| CN110510729A (en) * | 2019-08-14 | 2019-11-29 | 中国石油天然气集团有限公司 | Cleaning control method, system and corresponding moving bed biological filter tank reactor assembly |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171222 Termination date: 20200521 |