CN107879389B - Internal back pressure sewage treatment device - Google Patents
Internal back pressure sewage treatment device Download PDFInfo
- Publication number
- CN107879389B CN107879389B CN201711137787.6A CN201711137787A CN107879389B CN 107879389 B CN107879389 B CN 107879389B CN 201711137787 A CN201711137787 A CN 201711137787A CN 107879389 B CN107879389 B CN 107879389B
- Authority
- CN
- China
- Prior art keywords
- back pressure
- pipe
- water injection
- filter
- injection pipe
- Prior art date
- 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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- 239000010865 sewage Substances 0.000 title claims abstract description 25
- 238000011282 treatment Methods 0.000 title claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 92
- 238000002347 injection Methods 0.000 claims abstract description 45
- 239000007924 injection Substances 0.000 claims abstract description 45
- 238000001914 filtration Methods 0.000 claims abstract description 37
- 238000011010 flushing procedure Methods 0.000 claims abstract description 21
- 239000011148 porous material Substances 0.000 claims abstract description 18
- 239000010410 layer Substances 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 8
- 239000003638 chemical reducing agent Substances 0.000 claims description 7
- 239000002356 single layer Substances 0.000 claims description 2
- 238000004065 wastewater treatment Methods 0.000 claims 3
- 230000000694 effects Effects 0.000 abstract description 3
- 239000010802 sludge Substances 0.000 description 10
- 239000012535 impurity Substances 0.000 description 8
- 239000002245 particle Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 2
- 239000008213 purified water Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
- B01D29/31—Self-supporting filtering elements
- B01D29/33—Self-supporting filtering elements arranged for inward flow filtration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
- B01D29/52—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in parallel connection
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/62—Regenerating the filter material in the filter
- B01D29/66—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
- B01D29/68—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with backwash arms, shoes or nozzles
- B01D29/684—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with backwash arms, shoes or nozzles with a translatory movement with respect to the filtering element
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/62—Regenerating the filter material in the filter
- B01D29/66—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
- B01D29/68—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with backwash arms, shoes or nozzles
- B01D29/688—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with backwash arms, shoes or nozzles with backwash arms or shoes acting on the cake side
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/88—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices
- B01D29/94—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for discharging the filter cake, e.g. chutes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2201/00—Details relating to filtering apparatus
- B01D2201/40—Special measures for connecting different parts of the filter
- B01D2201/4038—Special measures for connecting different parts of the filter for connecting at least two filtering elements together
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/03—Pressure
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Filtration Of Liquid (AREA)
- Disintegrating Or Milling (AREA)
Abstract
An internal back pressure sewage treatment device comprises a shell and a filtering part arranged in the shell, wherein the shell is provided with a sewage inlet and a filtered water outlet, the filtering part comprises a filtering pipe, and the surface of the filtering pipe is provided with a pore canal; the sewage treatment device further comprises an inner back pressure flushing part, the inner back pressure flushing part comprises a movable power component and a back pressure water injection pipe connected with the movable power component, the back pressure water injection pipe is connected with a built-in back pressure chamber, the built-in back pressure chamber is positioned in the filter pipe, the back pressure water injection pipe is connected with the water injection pipe, and the water injection pipe is connected with a filtered water outlet. The device has the advantages of high filtering speed and good filtering effect.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to an internal back pressure sewage treatment device.
Background
The filter is a component for separating fluid and particles by enabling suspension (or dust-containing gas) on one side to flow to the other side through pore channels of the porous medium under the action of thrust and trapping particles by the pore channels. The filter has wide application in the fields of medium filtration, tail gas dust removal and the like.
In the prior art, after the filter filters, the timely removal of particles trapped by the pore canal is a key problem, because the filtration efficiency and the filtration speed of the filter are reduced along with the increase of residual particles in the pore canal. How to efficiently and rapidly remove particles attached to the surface of the pore canal is an important problem to be solved in the art.
The invention patent application of 201610474026.9 discloses a sludge and sewage comprehensive treatment, filtration and recovery device, wherein a tank body of the device is provided with a back pressure chamber for flushing, when the outer wall of a filter cylinder accumulates a sludge layer with a certain thickness and the water inlet pressure reaches a fixed value, a back flushing mode is started, back flushing water enters from an electric valve of a purified water outlet pipe, and the sludge layer on the filter cylinder falls down to be deposited at the bottom of the tank body. The device introduces backwash water to solve the problem of sludge accumulation on the filter layer, so that the filtering efficiency is improved, but the device 1) adopts purified water to complete backwash, and has high cost; 2) During back flushing, the whole filter cartridge is filled with back flushing water, the water consumption is large, and normal filtering work cannot be performed during back flushing.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides an internal back pressure sewage treatment device which takes filtered water as back flushing water, has small back flushing water consumption and good flushing effect, and adopts the following technical scheme: the utility model provides an interior back pressure sewage treatment plant, includes the casing and sets up the filtration part in the casing, establish sewage entry and filtration water export on the casing, its characterized in that: the filter part comprises a filter pipe, and the surface of the filter pipe is provided with a pore canal; the sewage treatment device further comprises an inner back pressure flushing part, the inner back pressure flushing part comprises a movable power component and a back pressure water injection pipe connected with the movable power component, the back pressure water injection pipe is connected with a built-in back pressure chamber, the built-in back pressure chamber is located in the filter pipe, the back pressure water injection pipe is connected with the water injection pipe, and the water injection pipe is connected with a filtered water outlet.
The invention is technically characterized in that: the outer contour of the built-in counter-pressure chamber matches the inner contour of the filter tube.
The invention is technically characterized in that: the filter tube comprises an effective filter part 23, and the surface of the filter tube of the effective filter part 23 is provided with pore passages.
The invention is technically characterized in that: the end of the effective filter unit 23 is provided with a stroke control member.
The invention is technically characterized in that: the travel control component is a travel switch.
The invention is technically characterized in that: the water pump in the water injection pipe is sent into the back pressure water injection pipe.
The invention is technically characterized in that: the pressure of the water injected into the built-in back pressure chamber is P1, and the water area pressure between the shell and the filter pipe is P2, wherein P1 is more than P2.
The invention is technically characterized in that: the movable power part comprises a motor, a speed reducer connected with the motor, and a rotary crank connected with an output shaft of the speed reducer, wherein one end of a connecting rod is hinged on a rotating disc of the rotary crank, and the other end of the connecting rod is connected with the back pressure water injection pipe.
The invention is technically characterized in that: the movable power component comprises a power cylinder, and a piston rod of the power cylinder is connected with a back pressure water injection pipe.
The invention has the beneficial effects that: the device uses the filtered water in the built-in back pressure chamber to flush the impurities attached to the wall of the filter pipe by means of pressure difference, the flushed impurities are deposited at the bottom of the shell, and finally the impurities are discharged by a sludge pump; the device has the advantages of high filtering speed and good filtering effect.
Drawings
FIG. 1 is a schematic diagram of the principles of the present invention;
FIG. 2 is a first embodiment of the invention;
FIG. 3 is a diagram of a second embodiment of the present invention;
FIG. 4 is a schematic diagram of a mobile power unit;
1. a housing; 2. a filter tube; 3. a built-in counter-pressure chamber; 4. a travel switch; 5. a back pressure water injection pipe; 11. a motor; 12. a speed reducer; 13. a rotary crank; 14. a connecting rod; 15. a water injection pipe; 16. a sludge pump; 17. a back pressure water injection pump; 18. a movable joint; 19. a filter connecting pipe; 20. a filtered water output control valve; 21. a back pressure flush control valve; 22. a filtered water output branch; 23. an effective filtering part; 24. and a bent pipe part.
Detailed Description
The following describes specific embodiments of the present invention with reference to the drawings.
Referring to fig. 1, the invention discloses an internal back pressure sewage treatment device, which comprises a shell 1 and a filtering part arranged in the shell 1, wherein a sewage inlet and a filtered water outlet are arranged on the shell 1, and a sludge pump 16 is arranged at the bottom of the shell 1 so as to discharge sludge deposited at the bottom of the shell 1.
The filtering part comprises a filtering pipe 2, the surface of the filtering pipe 2 is provided with a pore canal, the filtering pipe 2 can be a single-layer metal pipe or a hard plastic pipe, the surface of the metal pipe or the plastic pipe is provided with a pore canal, the filtering part can also be of a double-layer structure, one layer is a filtering core, the other layer is a metal pipe or a plastic pipe which plays a supporting role, and the surface of the metal pipe or the plastic pipe is also provided with a pore canal. The filtered water obtained by passing the sewage discharged from the sewage inlet in the casing 1 through the filter tube 2 is collected in the filter tube 2 and discharged from the filtered water outlet, and the filtered impurities and the like are precipitated at the bottom of the casing 1 and discharged by the sludge pump 16.
In order to clean impurities attached to the pore canal in time, the sewage treatment device further comprises an inner back pressure flushing part, the inner back pressure flushing part comprises a movable power part, the back pressure water injection pipe 5 is connected with the built-in back pressure chamber 3, the built-in back pressure chamber 3 is positioned in the filter pipe 2, the outer contour of the built-in back pressure chamber is matched with the inner contour of the filter pipe 2, such as the inner contour is round, and of course, the inner back pressure flushing part can also be in other shapes. The back pressure water injection pipe 5 is connected with the water injection pipe 15, and the water injection pipe 15 is connected with the filtered water outlet, namely is connected with the filter pipe 2, so that the filtered water is pumped into the water injection pipe 15 and is conveyed to the back pressure water injection pipe 5, the back pressure water enters the built-in back pressure chamber 3 from the back pressure water injection pipe 5, the pressure of the built-in back pressure chamber 3 after water injection is P1, the sewage water area pressure between the shell 1 and the filter pipe 2 is P2, P1> P2, and the back pressure water flushes impurities accumulated on the pipe wall of the filter pipe 2 so as to realize the efficient filtration of the filter pipe 2.
The filter tube 2 comprises an effective filter part 23, the surface of the filter tube of the effective filter part 23 is provided with a pore canal, and the filter tube also comprises a bent pipe part 24, and the surface of the bent pipe part 24 is not provided with a pore canal; for the purpose of controlling the back flushing stroke, the end of the effective filter portion 23 is provided with a stroke control member, which may be a stroke switch 4.
The movable power part can adopt a power cylinder, the power cylinder is a hydraulic cylinder or an air cylinder, and a piston rod of the hydraulic cylinder or the air cylinder is connected with the back pressure water injection pipe 5 to drive the back pressure water injection pipe 5 to move up and down; the motor can also be used for driving, and comprises a motor 11, a speed reducer 12 connected with the motor 11, and a rotary crank 13 connected with an output shaft of the speed reducer 12, wherein one end of a connecting rod 14 is hinged on a rotary disc of the rotary crank 13, and the other end of the connecting rod is connected with the back pressure water injection pipe 5. The back pressure water injection pipe 5 moves up and down under the drive of the motor 11.
When in use, sewage enters the shell 1 through the sewage, and filtered water enters the filter pipe 2 through the pore canal and flows out from the filtered water outlet; in order to clean impurities attached to the pore canal in time, the built-in back pressure chamber 3 is connected by the movable joint 18 by means of the elbow pipe 24, the elbow pipe 24 is communicated with the filtering connecting pipe 19, the filtering water enters the filtering pipe 2 through the effective filtering part 23 and flows to the filtering connecting pipe 19 through the elbow pipe 24, finally the force difference of the filtering connecting pipe 19 flushes the pipe wall, and the flushed impurities are collected to the bottom of the shell 1 and discharged by the sludge pump 16.
Fig. 2 shows an embodiment of the present invention, in which the whole filter tube is arranged in a serpentine shape in the housing 1, the effective filter portion 23 and the elbow portion 24 are connected by the union 18, the elbow portion 24 is all communicated with the filter connecting tube 19, the filtered water enters the filter tube through the effective filter portion 23, flows to the filter water connecting tube 19 through the elbow portion 24, and finally is collected from the filter connecting tube 19 to the filtered water outlet. The pipeline of the water injection pipe 15 is provided with a back pressure water injection pump 17, the water injection pipe 15 is also provided with a filtered water output branch 22, the branch is provided with a filtered water output control valve 20, filtered water can be injected into the back pressure water injection pipe 5 after passing through a back flushing control valve 21 and used as back flushing water, and the filtered water can be conveyed to a sewage treatment device at the next stage through the filtered water output branch 22 to continue filtering, and can be used as reclaimed water after being output through the filtered water output branch 22.
Fig. 3 is a further embodiment of the present invention, which differs from the previous embodiment in that the upper bent portion of the filter tube 2 is omitted, the effective filter portion 23 is connected by the bent portion 24 located at the lower portion thereof, and the filtered water obtained through the effective filter portion 23 is collected into the filter connection tube 19 and pumped outward through the back pressure water injection pump 17.
Of course, the above description is not intended to limit the invention, but rather the invention is not limited to the above examples, and variations, modifications, additions or substitutions within the spirit and scope of the invention will be within the scope of the invention.
Claims (5)
1. The utility model provides an interior back pressure sewage treatment plant, includes the casing and sets up the filter element in the casing, establish sewage entry and filtration water export on the casing, its characterized in that:
the filtering part comprises a filtering pipe, wherein the filtering pipe is a single-layer metal pipe or a hard plastic pipe, and a pore canal is formed in the surface of the metal pipe or the hard plastic pipe; or the filter tube is of a double-layer structure, one layer is a filter core, the other layer is a metal tube or a plastic tube which plays a supporting role, and the surface of the metal tube or the plastic tube is also provided with a hole;
the sewage treatment device also comprises an internal back pressure flushing part, the internal back pressure flushing part comprises a movable power component and a back pressure water injection pipe connected with the movable power component, the movable power component drives the back pressure water injection pipe to move up and down, the back pressure water injection pipe is connected with a built-in back pressure chamber, the built-in back pressure chamber is positioned in the filter pipe, the outer contour of the built-in back pressure chamber is matched with the inner contour of the filter pipe,
the back pressure water injection pipe is connected with the water injection pipe, and the water injection pipe is connected with the filtered water outlet;
the pressure of the built-in back pressure chamber after water injection is P1, and the water area pressure between the shell and the filter pipe is P2, wherein P1 is more than P2;
the movable power part comprises a motor, a speed reducer connected with the motor, a rotary crank connected with an output shaft of the speed reducer, and a connecting rod with one end hinged on a rotating disc of the rotary crank and the other end connected with the back pressure water injection pipe;
or the movable power part comprises a power cylinder, and a piston rod of the power cylinder is connected with the back pressure water injection pipe.
2. The wastewater treatment apparatus according to claim 1, wherein: the filter tube comprises an effective filter part, and the surface of the filter tube of the effective filter part is provided with a pore canal.
3. The wastewater treatment apparatus according to claim 2, wherein: the end of the effective filtering part is provided with a stroke control component.
4. A sewage treatment apparatus as claimed in claim 3, wherein: the travel control component is a travel switch.
5. The wastewater treatment apparatus according to claim 1, wherein: the water pump in the water injection pipe is sent into the back pressure water injection pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711137787.6A CN107879389B (en) | 2017-11-16 | 2017-11-16 | Internal back pressure sewage treatment device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711137787.6A CN107879389B (en) | 2017-11-16 | 2017-11-16 | Internal back pressure sewage treatment device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107879389A CN107879389A (en) | 2018-04-06 |
| CN107879389B true CN107879389B (en) | 2023-12-19 |
Family
ID=61777126
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711137787.6A Active CN107879389B (en) | 2017-11-16 | 2017-11-16 | Internal back pressure sewage treatment device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107879389B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111874998A (en) * | 2020-07-30 | 2020-11-03 | 浙江华强环境科技有限公司 | Continuous ceramic membrane filter |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2348908Y (en) * | 1998-08-14 | 1999-11-17 | 张大川 | Pipeline type inner pressure microfilter device for water treatment |
| CN2357799Y (en) * | 1998-08-14 | 2000-01-12 | 张大川 | External compression microfiltering device for treating pipe water |
| KR20020053790A (en) * | 2002-05-15 | 2002-07-05 | 박찬우 | Washing method for a water collection pipe |
| CN205031972U (en) * | 2015-08-25 | 2016-02-17 | 东莞安默琳机械制造技术有限公司 | Self -cleaning filter of back flush linkage |
| CN107096272A (en) * | 2017-05-10 | 2017-08-29 | 上海伶尔亿环境工程有限公司 | A kind of full-automatic shell and tube backwash filter and its filter method |
| CN207537168U (en) * | 2017-11-16 | 2018-06-26 | 李金栋 | A kind of interior back-pressure sewage-treatment plant |
-
2017
- 2017-11-16 CN CN201711137787.6A patent/CN107879389B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2348908Y (en) * | 1998-08-14 | 1999-11-17 | 张大川 | Pipeline type inner pressure microfilter device for water treatment |
| CN2357799Y (en) * | 1998-08-14 | 2000-01-12 | 张大川 | External compression microfiltering device for treating pipe water |
| KR20020053790A (en) * | 2002-05-15 | 2002-07-05 | 박찬우 | Washing method for a water collection pipe |
| CN205031972U (en) * | 2015-08-25 | 2016-02-17 | 东莞安默琳机械制造技术有限公司 | Self -cleaning filter of back flush linkage |
| CN107096272A (en) * | 2017-05-10 | 2017-08-29 | 上海伶尔亿环境工程有限公司 | A kind of full-automatic shell and tube backwash filter and its filter method |
| CN207537168U (en) * | 2017-11-16 | 2018-06-26 | 李金栋 | A kind of interior back-pressure sewage-treatment plant |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107879389A (en) | 2018-04-06 |
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