CN109248475A - A kind of coil type sedimentation basin - Google Patents
A kind of coil type sedimentation basin Download PDFInfo
- Publication number
- CN109248475A CN109248475A CN201811073617.0A CN201811073617A CN109248475A CN 109248475 A CN109248475 A CN 109248475A CN 201811073617 A CN201811073617 A CN 201811073617A CN 109248475 A CN109248475 A CN 109248475A
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- CN
- China
- Prior art keywords
- waterwall
- support
- mud
- winding
- sedimentation basin
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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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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/003—Sedimentation tanks provided with a plurality of compartments separated by a partition wall
- B01D21/0033—Vertical, perforated partition walls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/0039—Settling tanks provided with contact surfaces, e.g. baffles, particles
- B01D21/0045—Plurality of essentially parallel plates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/02—Settling tanks with single outlets for the separated liquid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/24—Feed or discharge mechanisms for settling tanks
- B01D21/245—Discharge mechanisms for the sediments
Abstract
The present invention relates to a kind of coil type sedimentation basins, including pond body, support is vertically arranged in pond body with waterwall, support goes out waterwall and every mud plate, and pond body is divided into inhalant region, settling zone, exhalant region and sludge discharging area, sludge discharging area is arranged in settling zone one end and by separating every mud plate, go out also horizontally disposed between waterwall to have at least one set of edge perpendicular to the winding component advanced every mud plate direction with waterwall and support in support, and settling zone is divided into multiple sub-settling zones by winding component, every corresponding to every group of winding component in mud plate, one mud drainage slot is set, it there also is provided the cleaning shoe that tilts upward across mud drainage slot and can resist winding component in sludge discharging area.Compared with prior art, the present invention is capable of increasing deposition efficiency, shortens particle settling height, shorten the sedimentation time, under same treatment capabilities might, to be substantially reduced sedimentation basin volume, so that land resource is efficiently utilized, and solves the problems, such as that inclined tube/plate sludge from sedimentation tank is unsmooth.
Description
Technical field
The invention belongs to technical field of water treatment equipment, are related to a kind of coil type sedimentation basin.
Background technique
Under gravity, the structures that suspended particulate in water is separated are sedimentation basin.In water treatment procedure, mixed,
After flocculation, suspended particulate has formed the biggish floccule body of partial size in water, needs to remove in precipitating structures.Even long-term water
The more clear water source of matter, for adapt to rain after turbidity increase the characteristics of, it is also desirable to build precipitating structures make a return journey water removal in turbidity.?
Under normal circumstances, sedimentation basin can remove in water removal 90% or more suspended matter, better than the effect of filter removal suspended solid.
Various forms of sedimentation basins are constructed with difference, but the principle for separating suspended particulate is essentially identical.Generally there is perpendicular stream
Formula sedimentation basin, flat flow and radical sedimentation basin.Wherein, water flow moves upwards in vertical sedimentation basin, and suspended particulate is transported downwards
It is dynamic, therefore main removal sinking speed is greater than the particle of water velocity, surface loading is smaller, and occupied area is larger, directly limits
The application of the sedimentation basin.Water flow flows to periphery from pond center in radical sedimentation basin, and horizontal flow velocity is gradually reduced, and sedimentation impurity is heavy
It forms sediment to bottom.This sedimentation basin occupied area is larger, and construction is relative complex, and water outlet uniformity is poor.Therefore it is mostly used for high turbid
Spend the preliminary sedimentation processing of water or the sewage treatment that delivery turbidity is of less demanding.Therefore, at present using it is more be horizontal sedimentation tank.
Horizontal sedimentation tank application is more early, and use scope is extensive, and structure is simple, and performance is stablized, resistance to certain impact load,
Removal rate is higher, manages after building up also more convenient.But horizontal sedimentation tank occupied area is larger, matches, it is unsuitable uniform to be discharged, water flow
Fluidised form is complicated, removes the effect of suspended particulate, is often influenced by pond body construction and external condition, therefore, in nowadays land resource
Growing tension, the people require to step up to domestic water water quality, water, and the application of horizontal sedimentation tank is subject to certain restrictions.
1904, Hazen proposed shallow pool theory: under conditions of precipitating pool volume is certain, pond is deep more shallow, and desilting area is got over
Greatly, suspended particulate removal rate is higher.Thus inclined tube/plate sedimentation basin is developed: in flat flow or the settling zone of vertical sedimentation basin
It is interior to be divided into a series of shallow layer precipitating layers using inclined parallel pipe or parallelpiped (sometimes using honeycomb filler), it is processed
And the heavy mud of sedimentation mutually move and separate in each precipitating shallow-layer.Inclined-tube sedimentation tank treatment effeciency is high, and flow-shape is stablized,
The shortcomings that occupied area is small, compensates for horizontal sedimentation tank to a certain extent, but simultaneously as the residence time it is short, buffer capacity
Power is poor, requires height to coagulation, and because of the construction reason of inclined-tube sedimentation tank itself, the length of itself inclined tube inclined plate and inclination angle are difficult
With balance: the length of inclined plate inclined tube is longer, and inclination angle is smaller, and settling efficiency is higher.But inclined plate inclined tube is too long, and production and installation are all compared
It is more difficult, and after length increase to a certain extent, it is further added by length and the raising of settling efficiency is but limited；It gets at inclination angle
Small, spoil disposal is more difficult, and microorganism easy to be filmed impacts effluent quality on filler, and accumulates over a long period and have the danger of collapsing
Danger.Maintenance management is very complicated.
In view of the above-mentioned problems, the present invention provides a kind of novel coil type sedimentation basin, rectangular sedimentation tank can be significantly solved
It takes up a large area, the problems such as inclined tube inclined-plate clarifying basin spoil disposal is difficult, complex management, to improve the quality and efficiency of water process.
Summary of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of coil type sedimentation basins.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of coil type sedimentation basin, including pond body, be vertically arranged in pond body support with waterwall, support go out waterwall and every
Mud plate, and the pond body is divided into inhalant region, settling zone, exhalant region and sludge discharging area, wherein inhalant region, settling zone, exhalant region
It is sequentially arranged along sewage disengaging direction and goes out waterwall with waterwall and support by the support and separate, the sludge discharging area is arranged in precipitating
Area one end and by separating every mud plate, support with waterwall and support go out between waterwall it is also horizontally disposed have at least one set of edge perpendicular to
Every the winding component that mud plate direction is advanced, and the settling zone is divided into multiple sub-settling zones by the winding component, it is described
One mud drainage slot is set every corresponding to every group of winding component in mud plate, there also is provided and tilted upward across the row in the sludge discharging area
Mud groove and the cleaning shoe that the winding component can be resisted.
Further, the support, which is matched, is distributed on waterwall so that inhalant region is respectively communicated with the water distribution of each sub-settling zone
Hole, the support, which goes out on waterwall, is distributed with the effluent trough so that exhalant region is respectively communicated with each sub-settling zone.
Further, the winding component includes being transversely arranged on support by first axle pedestal to go out with waterwall and support
Winding transverse direction roll shaft on waterwall is provided on winding transverse direction roll shaft and drives the heavy mud winding advanced by it；
The support, which is matched, is also equipped with the second lateral roll shaft by the second axis pedestal on waterwall, on the second lateral roll shaft
It is provided with the cleaning shoe that rotates with it and can resist the turn-around zone of the heavy mud winding.
Further, the winding transverse direction roll shaft and the second lateral roll shaft pass through angular wheel respectively and connect external drive
The winding longitudinal direction roll shaft and second longitudinal direction roll shaft of dynamic equipment.
Further, the direction of travel of the upper part of the heavy mud winding is towards the mud drainage slot.
Further, there are four the sub-settling zone is set.
Further, the bottom of the sub-settling zone of bottom is equipped with inclined spoil disposal bottom plate, the lower end of the spoil disposal bottom plate
Connection is placed in the spoil disposal ditch below sludge discharging area, is equipped with dredging tube in spoil disposal ditch.
Further, the spoil disposal ditch is in the cone-shaped of opening upwards.
Further, the bottom of the inhalant region is equipped with the water inlet pipe of the external water inlet equipment of connection, the exhalant region
Top is equipped with outlet pipe.
Compared with prior art, the invention has the following advantages that
(1) the utility model coil type efficient sedimentation tank, by the way that winding system is arranged in rectangular sedimentation tank, by sedimentation basin point
For four settling zones, each settling zone can be considered an individual horizontal sedimentation tank, in the case where identical occupied area, precipitating
Area increases by three times, and " shallow pool theory " is it is found that deposition efficiency improves three times again.
(2) distributing hole is arranged in each sub-settling zone entrance, in each sub-settling zone in the utility model coil type efficient sedimentation tank
Outlet setting overflow launder, can significantly improve even water distribution degree, improve treatment effeciency.
(3) the utility model coil type efficient sedimentation tank conveys sludge by heavy mud winding campaign, and in the steering of heavy mud winding
Marginal position is arranged cleaning shoe and every mud plate, can be realized mud-water separation, significantly improves inclined tube inclined-plate clarifying basin spoil disposal difficulty etc.
Problem prevents sedimentation basin from blocking.
(4) the utility model coil type efficient sedimentation tank can also pass through the external fortune for controlling drive system and controlling heavy mud winding
Dynamic and cleaning shoe position, convenient operation and management, then can improve inclined tube inclined-plate clarifying basin complex management, it is at high cost the problems such as.
(5) the utility model coil type efficient sedimentation tank is such as equipped with electronic control system, sedimentation basin can be made to operate, spoil disposal is complete
Automatic operating saves artificial, energy conservation and environmental protection.
Detailed description of the invention
Fig. 1 is schematic view of the front view of the invention；
Fig. 2 is side structure schematic view of the invention；
Fig. 3 is overlooking structure diagram of the invention；
Fig. 4 is the schematic cross-sectional view that support of the invention matches waterwall；
Fig. 5 is the diagrammatic cross-section that support of the invention goes out waterwall；
Description of symbols in figure:
1- pond body, 2- support match waterwall, and 3- support goes out waterwall, 4- first axle pedestal, 5- winding transverse direction roll shaft, the second axis of 6-
Pedestal, the lateral roll shaft of 7- second, 8- cleaning shoe, 9- spoil disposal ditch, 10- dredging tube, 11- distributing hole, 12- winding longitudinal direction roll shaft, 13-
Second longitudinal direction roll shaft, 14- angular wheel, 15- water-sealed bearing, 16- effluent trough, 17- waterproof cover, 18- water inlet pipe, 19- outlet pipe,
20- sinks mud winding, and 21- spoil disposal bottom plate, 22- is every mud plate, 23- mud drainage slot.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.The present embodiment is with technical solution of the present invention
Premised on implemented, the detailed implementation method and specific operation process are given, but protection scope of the present invention is not limited to
Following embodiments.
In following embodiment, unless otherwise instructed, then structure used by showing or equipment are that this field is conventional
The equipment or structure of its function can be achieved, such as control drive system can be using common driving motor etc..
A kind of coil type sedimentation basin, structure is shown referring to figures 1-3, including pond body 1, is vertically arranged in pond body 1
Support goes out waterwall 3 and is divided into inhalant region, settling zone, exhalant region and spoil disposal every mud plate 22, and by pond body 1 with waterwall 2, support
Area, wherein inhalant region, settling zone, exhalant region are sequentially arranged along sewage disengaging direction and go out waterwall with waterwall 2 and support by support
3 separate, and sludge discharging area is arranged in settling zone one end and by separating every mud plate 22, go out between waterwall 3 also in support with waterwall 2 and support
It is horizontally disposed to there is at least one set of edge to divide settling zone perpendicular to the winding component advanced every 22 direction of mud plate, and by winding component
For multiple sub-settling zones, one mud drainage slot 23 is set every corresponding to every group of winding component in mud plate 22, there also is provided and incline in sludge discharging area
It passes through mud drainage slot 23 obliquely and the cleaning shoe 8 of winding component can be resisted.
When handling sewage, sewage is discharged into inhalant region coil type sedimentation basin of the invention, then is divided through only support with waterwall 2
With precipitating respectively into each sub-settling zone, the impurity such as sludge of precipitating are attached on winding component, the dirt on winding component
When mud is accumulated to a certain extent, its movement is controlled, while adjusting 8 position of cleaning shoe, so that it resists winding component, so that attachment
Sludge on winding component is struck off by the cleaning shoe 8 being close to, and is guided through mud drainage slot 23, is discharged into sludge discharging area
Pond body 1, and the water outlet after precipitation process is then discharged into next processing unit through exhalant region.
Shown in Figure 2 in a specific embodiment of the invention, support, which is matched, to be distributed on waterwall 2 so that intaking
Area is respectively communicated with the distributing hole 11 of each sub-settling zone, and support goes out on waterwall 3 to be distributed with so that exhalant region is respectively communicated with every height
The effluent trough 16 of settling zone.
In another specific embodiment of the invention, referring again to shown in Fig. 1 and Fig. 2, winding component includes passing through
First axle pedestal 4 is transversely arranged on the winding transverse direction roll shaft 5 that support goes out with waterwall 2 and support on waterwall 3, in winding transverse direction roll shaft
It is provided on 5 and the heavy mud winding 20 advanced is driven by it；Support is horizontal with being also equipped with second by the second axis pedestal 6 on waterwall 2
To roll shaft 7, the cleaning shoe 8 that rotates with it and can resist the turn-around zone of heavy mud winding 20 is provided on the second lateral roll shaft 7.
At this point, being provided with water-sealed bearing 15 and expanding screw wire hole on first axle pedestal 4 and the second axis pedestal 6, may be used also outside water-sealed bearing 15
To be coated with waterproof cover 17, winding transverse direction roll shaft 5 and the second lateral roll shaft 7 can be rotatablely installed respectively by water-sealed bearing 15
On first axle pedestal 4 and the second axis pedestal 6.Further, please in shown in Figure 2, transmission for convenience, winding is lateral
Roll shaft 5 and the second lateral roll shaft 7 connect the winding longitudinal direction roll shaft 12 and second of external driving equipment by angular wheel 14 respectively
Longitudinal roll shaft 13, when specific works, it can winding longitudinal direction roll shaft 12 and second vertical is driven by external control drive system
The movement that longitudinally rotates to roll shaft 13, and will be longitudinally rotated through angular wheel 14 and be converted into winding transverse direction roll shaft 5 and second laterally
The lateral rotation of roll shaft 7, and then the movement of heavy mud winding 20 and cleaning shoe 8 can be simultaneously or separately controlled, so that it is easy to operate,
High degree of automation.
Further, for the direction of travel of the upper part of heavy mud winding 20 towards mud drainage slot 23, the position of cleaning shoe 8 is preferred
It is placed in the lower section of heavy mud winding 20, after it rotate in place, can be close to resist the lower part in heavy 20 deflecting region of mud winding, in turn
The sludge struck off can be made to fall on cleaning shoe 8, and sludge discharging area is directed by it.
In another specific embodiment of the invention, there are four shown in Fig. 1-Fig. 5, sub-settling zone is set,
Corresponding winding component is equipped with three groups.
In another specific embodiment of the invention, referring again to shown in Fig. 2, Fig. 4 and Fig. 5, the son of bottom is heavy
The bottom in shallow lake area is equipped with inclined spoil disposal bottom plate 21, and the lower end connection of spoil disposal bottom plate 21 is placed in the spoil disposal ditch 9 below sludge discharging area,
Dredging tube 10 is installed in spoil disposal ditch 9.Further, spoil disposal ditch 9 is in the cone-shaped of opening upwards.
In another specific embodiment of the invention, referring again to shown in Fig. 2 and Fig. 3, the bottom of inhalant region is equipped with
The water inlet pipe 18 of the external water inlet equipment of connection, the top of exhalant region are equipped with outlet pipe 19.
The above description of the embodiments is intended to facilitate ordinary skill in the art to understand and use the invention.
Person skilled in the art obviously easily can make various modifications to these embodiments, and described herein general
Principle is applied in other embodiments without having to go through creative labor.Therefore, the present invention is not limited to the above embodiments, ability
Field technique personnel announcement according to the present invention, improvement and modification made without departing from the scope of the present invention all should be of the invention
Within protection scope.
Claims (9)
1. a kind of coil type sedimentation basin, which is characterized in that including pond body (1), support is vertically arranged in pond body (1) with waterwall
(2), support goes out waterwall (3) and every mud plate (22), and the pond body (1) is divided into inhalant region, settling zone, exhalant region and spoil disposal
Area, wherein inhalant region, settling zone, exhalant region are sequentially arranged and by the support along sewage disengaging direction with waterwall (2) and support
Out waterwall (3) separate, the sludge discharging area be arranged in settling zone one end and by every mud plate (22) separate, support with waterwall (2) with
Support go out between waterwall (3) it is also horizontally disposed have it is at least one set of along perpendicular to the winding component advanced every mud plate (22) direction, and
The settling zone is divided into multiple sub-settling zones by the winding component, it is described every corresponding to every group of winding component on mud plate (22)
One mud drainage slot (23) is set, be there also is provided in the sludge discharging area and tilted upward across the mud drainage slot (23) and can resist described
The cleaning shoe (8) of winding component.
2. a kind of coil type sedimentation basin according to claim 1, which is characterized in that the support is on waterwall (2) points
Be furnished with so that inhalant region is respectively communicated with the distributing hole (11) of each sub-settling zone, the support go out on waterwall (3) to be distributed with so that
Exhalant region is respectively communicated with the effluent trough (16) of each sub-settling zone.
3. a kind of coil type sedimentation basin according to claim 1, which is characterized in that the winding component includes by the
One axis pedestal (4) is transversely arranged on the winding transverse direction roll shaft (5) that support goes out with waterwall (2) and support on waterwall (3), in winding cross
It is provided on roll shaft (5) and the heavy mud winding (20) advanced is driven by it；
The support is with also the second lateral roll shaft (7) is equipped with by the second axis pedestal (6) on waterwall (2), laterally second
The cleaning shoe (8) that rotates with it and can resist the deflecting region of the heavy mud winding (20) is provided on roll shaft (7).
4. a kind of coil type sedimentation basin according to claim 3, which is characterized in that the winding transverse direction roll shaft (5) and
Second lateral roll shaft (7) connects the winding longitudinal direction roll shaft (12) of external driving equipment and second by angular wheel (14) respectively and indulges
To roll shaft (13).
5. a kind of coil type sedimentation basin according to claim 3, which is characterized in that the upper part of the heavy mud winding (20)
Direction of travel towards the mud drainage slot (23).
6. a kind of coil type sedimentation basin according to claim 1, which is characterized in that there are four the sub-settling zone is set.
7. a kind of coil type sedimentation basin according to claim 1, which is characterized in that the bottom of the sub-settling zone of bottom is set
There is inclined spoil disposal bottom plate (21), the lower end connection of the spoil disposal bottom plate (21) is placed in the spoil disposal ditch (9) below sludge discharging area, is arranging
Dredging tube (10) are installed in mud ditch (9).
8. a kind of coil type sedimentation basin according to claim 7, which is characterized in that the spoil disposal ditch (9) in opening to
On cone-shaped.
9. a kind of coil type sedimentation basin according to claim 1, which is characterized in that the bottom of the inhalant region, which is equipped with, to be connected
The water inlet pipe (18) of external water inlet equipment is connect, the top of the exhalant region is equipped with outlet pipe (19).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811073617.0A CN109248475B (en) | 2018-09-14 | 2018-09-14 | Winding type sedimentation tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811073617.0A CN109248475B (en) | 2018-09-14 | 2018-09-14 | Winding type sedimentation tank |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109248475A true CN109248475A (en) | 2019-01-22 |
| CN109248475B CN109248475B (en) | 2020-06-26 |
Family
ID=65046910
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811073617.0A Active CN109248475B (en) | 2018-09-14 | 2018-09-14 | Winding type sedimentation tank |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109248475B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109833654A (en) * | 2019-03-23 | 2019-06-04 | 王沛才 | A kind of flat wound membrane of automatic cleaning water (cloth) sedimentation basin |
| CN110357235A (en) * | 2019-08-01 | 2019-10-22 | 珠海九通水务股份有限公司 | Water treating pond |
| CN112370824A (en) * | 2020-11-24 | 2021-02-19 | 中国水利水电第九工程局有限公司 | Automatic dredging and water cleaning tank of sandstone production wastewater treatment system and use method |
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| JP2004298737A (en) * | 2003-03-31 | 2004-10-28 | Ebara Corp | Method and apparatus for solid-liquid separation using precipitation tank |
| JP2007117870A (en) * | 2005-10-27 | 2007-05-17 | Kubota Corp | Moving bed apparatus for sludge collection and method for sludge collection |
| CN105582702A (en) * | 2014-10-24 | 2016-05-18 | 周敉 | Multilayer movable chain plate unit combined sedimentation tank process |
| CN107998697A (en) * | 2018-01-24 | 2018-05-08 | 成都纽扣互动科技有限公司 | A kind of rectangular sedimentation tank for being used to handle graphite high-temperature tail gas condensate liquid |
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2018
- 2018-09-14 CN CN201811073617.0A patent/CN109248475B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004298737A (en) * | 2003-03-31 | 2004-10-28 | Ebara Corp | Method and apparatus for solid-liquid separation using precipitation tank |
| JP2007117870A (en) * | 2005-10-27 | 2007-05-17 | Kubota Corp | Moving bed apparatus for sludge collection and method for sludge collection |
| CN105582702A (en) * | 2014-10-24 | 2016-05-18 | 周敉 | Multilayer movable chain plate unit combined sedimentation tank process |
| CN107998697A (en) * | 2018-01-24 | 2018-05-08 | 成都纽扣互动科技有限公司 | A kind of rectangular sedimentation tank for being used to handle graphite high-temperature tail gas condensate liquid |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109833654A (en) * | 2019-03-23 | 2019-06-04 | 王沛才 | A kind of flat wound membrane of automatic cleaning water (cloth) sedimentation basin |
| WO2020191917A1 (en) * | 2019-03-23 | 2020-10-01 | 王沛才 | Automatic cleaning horizontal film (fabric) sedimentation tank |
| CN110357235A (en) * | 2019-08-01 | 2019-10-22 | 珠海九通水务股份有限公司 | Water treating pond |
| CN112370824A (en) * | 2020-11-24 | 2021-02-19 | 中国水利水电第九工程局有限公司 | Automatic dredging and water cleaning tank of sandstone production wastewater treatment system and use method |
| CN112370824B (en) * | 2020-11-24 | 2021-12-14 | 中国水利水电第九工程局有限公司 | Automatic dredging and water cleaning tank of sandstone production wastewater treatment system and use method |
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| Publication number | Publication date |
|---|---|
| CN109248475B (en) | 2020-06-26 |
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