CN110843162A - Oil-gas gathering and transportation corrosion-resistant nylon pipe production system and method - Google Patents
Oil-gas gathering and transportation corrosion-resistant nylon pipe production system and method Download PDFInfo
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- CN110843162A CN110843162A CN201911140079.7A CN201911140079A CN110843162A CN 110843162 A CN110843162 A CN 110843162A CN 201911140079 A CN201911140079 A CN 201911140079A CN 110843162 A CN110843162 A CN 110843162A
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- Prior art keywords
- pipe
- corrosion
- oil
- jar
- gas gathering
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
- B29C41/04—Rotational or centrifugal casting, i.e. coating the inside of a mould by rotating the mould
- B29C41/042—Rotational or centrifugal casting, i.e. coating the inside of a mould by rotating the mould by rotating a mould around its axis of symmetry
- B29C41/045—Rotational or centrifugal casting, i.e. coating the inside of a mould by rotating the mould by rotating a mould around its axis of symmetry the axis being placed vertically, e.g. spin casting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
- B29B7/06—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices
- B29B7/10—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary
- B29B7/12—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary with single shaft
- B29B7/16—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary with single shaft with paddles or arms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/34—Component parts, details or accessories; Auxiliary operations
- B29C41/36—Feeding the material on to the mould, core or other substrate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2077/00—Use of PA, i.e. polyamides, e.g. polyesteramides or derivatives thereof, as moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2023/00—Tubular articles
- B29L2023/22—Tubes or pipes, i.e. rigid
Abstract
The invention discloses an oil-gas gathering and transportation corrosion-resistant nylon pipe production system and a method thereof. Through reasonable component design and casting molding, the obtained gathering and transportation pipeline has higher corrosion resistance and abrasion resistance, can avoid the conditions of corrosion, perforation, rapid aging and the like, prevents serious property loss of enterprises, and solves the most frequent transportation problem which brings harm to the public and the environment.
Description
Technical Field
The invention relates to the technical field of pipe production and processing, in particular to a system and a method for producing an oil-gas gathering and transportation corrosion-resistant nylon pipe.
Background
In the development of oil and gas fields, pipelines are ubiquitous in all links from drilling, mining, gathering and transportation, oil-gas-water treatment, storage and transportation and other production. The buried pipe network is the essential nerve and blood vessel of the general oil production unit in the oil field. With the increase of the speed of urbanization construction, a plurality of oil wells, oil collecting pipelines and the like of oil production units are located in municipal planning areas, and if the pipelines are frequently perforated, a plurality of disputes are caused on the problems of environmental pollution, industrial and agricultural relations and the like, so that people pay more and more attention.
The corrosion of oil field oil collecting buried pipe network generally includes four categories, micro battery corrosion, macro battery corrosion, microbial corrosion and stray current corrosion. The cause of the micro-battery corrosion lies in the uneven microscopic metallographic structure of the steel pipe, the corrosion form is uniform thinning, and the cause of the macro-battery corrosion is electrochemical corrosion caused by obvious potential difference at two ends of a pipe section due to the fact that a pipeline passes through different types of geology and physical and chemical parameters such as air permeability of soil along the pipeline are greatly changed. The corrosion forms local pits in the anode area and is an important cause of pipeline perforation leakage. The microbial corrosion is that partial fungi in soil participate in a corrosion process, and the stray current corrosion is local pitting corrosion of a flowing-out point due to the fact that leakage current of a subway or an electric car along a pipe network takes a pipe as a backflow passage. Except for the corrosion of the micro battery, the other three types of corrosion can cut off the electric contact between the steel pipe and the soil through the continuous compact outer coating, and the electric contact is effectively controlled. This can cause severe corrosion of the tube; especially in the case of individual pipe sections with a tendency to have a heavy anode, it is possible, when the corrosion protection layer is damaged, to cause strong corrosion of the pipe body in a short time or even to form perforations in the pipe body, which leads to leakage of the medium in the pipe.
Disclosure of Invention
The invention provides a corrosion-resistant nylon pipe production system for oil and gas gathering and transportation and a method thereof, aiming at solving the defects of the prior art.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the utility model provides a corrosion-resistant nylon tube production system that oil gas collection was failed, links the forming system including the polymer that is used for preparing liquid polymerization nylon, is used for the fashioned tubular product mould forming system of tubular product and is used for snatching the drawing of patterns mechanical system of tubular product, and the polymer is linked the forming system and is linked together with tubular product mould forming system, and drawing of patterns mechanical system installs the discharge end at tubular product mould forming system.
As above a corrosion-resistant nylon tube production system that oil gas collection was failed, the polymer link and form the system and constitute by melting material jar and polymerization jar, one side that melts the material jar is equipped with the vacuum pump, the vacuum pump with melt the material jar through first connecting pipe intercommunication, melt and be equipped with the delivery pump between material jar and the polymerization jar, the delivery pump with melt the material jar and all pass through the second connecting pipe intercommunication with delivery pump and polymerization jar, one side fixed mounting agitator pump of polymerization jar top surface, the lower extreme fixed mounting puddler of agitator pump, the puddler is located the polymerization jar, the lower extreme fixed mounting discharging pipe of polymerization jar.
As above corrosion-resistant nylon tube production system that oil gas gathering was failed, tubular product mould molding system constitute by electric heating element, outer heat preservation, temperature controller, tubular product mould, centrifugal transmission spare and speed controller, the bottom surface fixed mounting of outer heat preservation sets up the tubular product mould in the outer heat preservation on the electric heating element, the bottom surface fixed mounting centrifugal transmission spare of tubular product mould, one side fixed mounting speed controller and temperature controller in proper order of outer heat preservation top, the tubular product mould communicates with the tip of discharging pipe.
According to the oil-gas gathering and transporting corrosion-resistant nylon pipe production system, the demolding mechanical system is composed of the nut assembling and disassembling hand and the pipeline traction hand, the demolding mechanical system is located inside the outer heat-insulating layer, the nut assembling and disassembling hand is installed at one end of the pipe mold, and the pipeline traction hand is fixed at one end of the pipe mold.
As above corrosion-resistant nylon pipe production system of oil gas gathering, its characterized in that: the inlet of the melting tank is hinged with a sealing cover.
As above corrosion-resistant nylon pipe production system of oil gas gathering, its characterized in that: the lower end of the stirring rod is fixedly provided with a stirring paddle.
The production method of the corrosion-resistant nylon pipe for oil and gas gathering and transportation of any one of claims 1 to 6 comprises 100 parts of amide C6H11NO, white powder or crystals, 0.001 to 1 part of soda activator and 0.01 to 3 parts of polymerization agent lexan gum.
The invention has the advantages that: through reasonable component design and casting molding, the obtained gathering and transportation pipeline has higher corrosion resistance and abrasion resistance, can avoid the conditions of corrosion, perforation, rapid aging and the like, prevents serious property loss of enterprises, and solves the most frequent transportation problem which brings harm to the public and the environment.
Drawings
FIG. 1 is a schematic structural view of the present invention; FIG. 2 is an enlarged view of the schematic structure of the polymer chain forming system 1; FIG. 3 is an enlarged view of the schematic construction of the pipe die forming system 2; fig. 4 is an enlarged view of the schematic structure of the ejector mechanism 3.
Reference numerals: the device comprises a 1-macromolecule link forming system, a 2-pipe mold forming system, a 3-demolding mechanical system, a 4-material melting tank, a 5-polymerization tank, a 6-vacuum pump, a 7-first connecting pipe, an 8-feeding pump, a 9-second connecting pipe, a 10-stirring pump, an 11-stirring rod, a 12-discharging pipe, a 13-electric heating element, a 14-outer heat insulation layer, a 15-temperature controller, a 16-pipe mold, a 17-centrifugal transmission part, an 18-rotating speed controller, a 19-nut assembling and disassembling hand and a 20-pipeline traction hand.
Detailed Description
As shown in fig. 1 to 4, the system for producing a corrosion-resistant nylon pipe through oil gas gathering and transportation and the method thereof specifically disclosed in this embodiment include a polymer link forming system 1 for preparing liquid polymerized nylon, a pipe mold forming system 2 for pipe molding, and a demolding mechanical system 3 for grasping a pipe, wherein the polymer link forming system 1 is communicated with the pipe mold forming system 2, and the demolding mechanical system 3 is installed at a discharge end of the pipe mold forming system 2. Through reasonable component design and casting molding, the obtained gathering and transportation pipeline has higher corrosion resistance and abrasion resistance, can avoid the conditions of corrosion, perforation, rapid aging and the like, prevents serious property loss of enterprises, and solves the most frequent transportation problem which brings harm to the public and the environment. When using this device, can prepare liquid polymerization nylon through the macromolecule interlinkage forming system 1, the liquid polymerization nylon after preparation can enter into tubular product mould forming system 2 in the macromolecule interlinkage forming system 1 to can make its shaping, the drawing of patterns can be carried out in tubular product mould forming system 2 through drawing of patterns mechanical system 3 to the tubular product after the shaping.
Specifically, the polymer link forming system 1 described in this embodiment is composed of melting tank 4 and polymerization tank 5, one side of melting tank 4 is equipped with vacuum pump 6, vacuum pump 6 and melting tank 4 are communicated through first connecting pipe 7, be equipped with feed pump 8 between melting tank 4 and the polymerization tank 5, feed pump 8 and melting tank 4 all communicate through second connecting pipe 9 with feed pump 8 and polymerization tank 5, one side fixed mounting agitator pump 10 of polymerization tank 5 top surface, the lower extreme fixed mounting puddler 11 of agitator pump 10, puddler 11 is located polymerization tank 5, the lower extreme fixed mounting discharging pipe 12 of polymerization tank 5. 100 parts of caprolactam is added into a melting tank 4, the corresponding amount of a soda active agent is added, the melting tank 4 is sealed, a vacuum pump 4 works to enable the inside of the melting tank 4 to reach a state of-0.1 MPa and heat the inside of the melting tank to 130-150 ℃, the heating is carried out for 30 minutes, amide groups in the melting tank 4 are opened under the catalysis of the soda active agent to remove original H2O formed after the chain is opened, long carbon chain connection is formed, a feeding pump 8 works after 30 minutes, materials in the melting tank 4 are conveyed into a polymerization tank 5 at 130-150 ℃ through a second connecting pipe 9, the corresponding amount of polymerization agent Likenai is added, a stirring pump 10 works, and the stirring pump 10 drives a stirring rod 11 to fully stir in the polymerization tank 5 at a high speed, so that liquid polymerized nylon is obtained.
Specifically, the pipe mold forming system 2 described in this embodiment is composed of an electric heating element 13, an outer insulating layer 14, a temperature controller 15, a pipe mold 16, a centrifugal transmission element 17 and a rotation speed controller 18, wherein the bottom surface of the outer insulating layer 14 is fixedly installed on the electric heating element 13, the pipe mold 16 is arranged in the outer insulating layer 14, the centrifugal transmission element 17 is fixedly installed on the bottom surface of the pipe mold 16, the rotation speed controller 18 and the temperature controller 15 are sequentially and fixedly installed on one side above the outer insulating layer 14, and the pipe mold 16 is communicated with the end portion of the discharge pipe 12. When the device is used, the electric heating element 13 is modulated by 180-200 ℃ by the temperature controller 15, so that the outer heat-insulating layer 14 reaches 180 ℃. Injecting the prepared liquid polymerized nylon into a heated pipe mould 16 through a discharge pipe 12, starting a centrifugal transmission part 17 at a constant speed with the rotation speed of 800 r/min and adjusted to be in a low-vibration and high-concentric rotation state as much as possible, rotating for 10-30 minutes, shaping the pipe in the mould, and releasing heat in an outer heat insulation layer 14.
Further, the demolding mechanical system 3 described in this embodiment is composed of a nut assembling and disassembling hand 19 and a pipeline pulling hand 20, the demolding mechanical system 3 is located inside the outer insulating layer 14, the nut assembling and disassembling hand 19 is installed at one end of the pipe mold 16, and the pipeline pulling hand 20 is fixed at one end of the pipe mold 16. The temperature in the outer heat-insulating layer 14 is reduced to 50 ℃, the nylon pipe shrinks when being cooled, the nut assembling and disassembling hand 19 can remove the end cover at one end of the pipe mould 16, the pipeline drawing hand 20 fixes one end of the pipe mould 16, the whole pipe mould is drawn out of the mould and placed on the support for cooling, and then the corrosion-resistant nylon pipe for oil and gas gathering and transportation can be obtained.
Furthermore, the melting tank 4 of the embodiment is hinged with a sealing cover at the inlet. When the device is used, the sealing performance in the melting tank 4 can be improved through the sealing cover, and the melting tank 4 is prevented from entering dust.
Furthermore, the lower end of the stirring rod 11 of the present embodiment is fixedly installed with a stirring paddle. When the device is used, the liquid in the polymerization tank 5 can be conveniently and rapidly mixed together through the stirring paddle, so that the device is more convenient to use.
The production method of the corrosion-resistant nylon pipe for oil and gas gathering and transportation according to any one of claims 1 to 6, which comprises 100 parts of amide C6H11NO, white powder or crystals, 0.001-1 part of soda activator and 0.01-3 parts of polymerization agent lexan gum. The preparation process of the pipe comprises the following steps: 100 parts of caprolactam is added into a melting tank, the corresponding amount of soda activator is added, the mixture is heated to 150 ℃ in a sealed vacuum state for 30 minutes, the caprolactam is opened under the catalysis of the soda activator to remove amide groups, and original H2O formed after opening is removed to form long carbon chain connection. After 30 minutes, the previous materials are put into a polymerization tank, the corresponding components of polymerization agent lexan are added, and the mixture is fully stirred at a high speed. And putting the nylon tube into a tube mold which is heated to 160-180 ℃, centrifugally rotating for 10-30 minutes for molding, and demolding by using a demolding manipulator to obtain the nylon tube.
The embodiments of the present invention have been described above with reference to the accompanying drawings, but these descriptions should not be construed as limiting the scope of the present invention, and the technical contents not described in detail in the present invention are known in the art.
Claims (7)
1. The utility model provides a corrosion-resistant nylon tube production system of oil gas gathering, its characterized in that: the high-polymer-linked forming system comprises a high polymer-linked forming system (1) for preparing liquid polymerized nylon, a pipe mold forming system (2) for pipe forming and a demolding mechanical system (3) for grabbing a pipe, wherein the high polymer-linked forming system (1) is communicated with the pipe mold forming system (2), and the demolding mechanical system (3) is installed at the discharge end of the pipe mold forming system (2).
2. The oil and gas gathering and transportation corrosion-resistant nylon pipe production system according to claim 1, wherein: macromolecule link form system (1) constitute by melt jar (4) and polymerization jar (5), one side of melt jar (4) is equipped with vacuum pump (6), vacuum pump (6) and melt jar (4) are through first connecting pipe (7) intercommunication, be equipped with between melt jar (4) and the polymerization jar (5) feeding pump (8), feeding pump (8) and melt jar (4) and feeding pump (8) and polymerization jar (5) all through second connecting pipe (9) intercommunication, one side fixed mounting agitator pump (10) of polymerization jar (5) top surface, lower extreme fixed mounting puddler (11) of agitator pump (10), puddler (11) are located polymerization jar (5), lower extreme fixed mounting discharging pipe (12) of polymerization jar (5).
3. The oil and gas gathering and transportation corrosion-resistant nylon pipe production system according to claim 1, wherein: tubular product mould molding system (2) by electric heating element (13), outer heat preservation (14), temperature controller (15), tubular product mould (16), centrifugal transmission spare (17) and speed controller (18) are constituteed, the bottom surface fixed mounting of outer heat preservation (14) is on electric heating element (13), set up tubular product mould (16) in outer heat preservation (14), bottom surface fixed mounting centrifugal transmission spare (17) of tubular product mould (16), one side fixed mounting speed controller (18) and temperature controller (15) in proper order of outer heat preservation (14) top, tubular product mould (16) and the tip intercommunication of discharging pipe (12).
4. The oil and gas gathering and transportation corrosion-resistant nylon pipe production system according to claim 1, wherein: the demolding mechanical system (3) is composed of a nut assembling and disassembling hand (19) and a pipeline traction hand (20), the demolding mechanical system (3) is located inside the outer heat insulation layer (14), the nut assembling and disassembling hand (19) is installed at one end of the pipe mold (16), and the pipeline traction hand (20) is fixed at one end of the pipe mold (16).
5. The oil and gas gathering and transportation corrosion-resistant nylon pipe production system according to claim 2, wherein: the inlet of the melting tank (4) is hinged with a sealing cover.
6. The oil and gas gathering and transportation corrosion-resistant nylon pipe production system according to claim 2, wherein: the lower end of the stirring rod (11) is fixedly provided with a stirring paddle.
7. A method for producing corrosion-resistant nylon pipes for oil and gas gathering and transportation according to any one of claims 1 to 6, characterized in that: comprises 100 parts of amide C6H11NO, white powder or crystal, 0.1-1 part of soda activator and 0.1-3 parts of polymerization agent lexan gum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911140079.7A CN110843162A (en) | 2019-11-20 | 2019-11-20 | Oil-gas gathering and transportation corrosion-resistant nylon pipe production system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911140079.7A CN110843162A (en) | 2019-11-20 | 2019-11-20 | Oil-gas gathering and transportation corrosion-resistant nylon pipe production system and method |
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| Publication Number | Publication Date |
|---|---|
| CN110843162A true CN110843162A (en) | 2020-02-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911140079.7A Withdrawn CN110843162A (en) | 2019-11-20 | 2019-11-20 | Oil-gas gathering and transportation corrosion-resistant nylon pipe production system and method |
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| CN (1) | CN110843162A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1151931A (en) * | 1995-12-13 | 1997-06-18 | 潮安县科技尼龙制品厂 | Prodn of cast nylon pipe |
| JPH11262927A (en) * | 1998-03-17 | 1999-09-28 | Nippon Zeon Co Ltd | Reactive polymerization molding method and tubular molded object |
| CN102942693A (en) * | 2012-12-07 | 2013-02-27 | 许昌汉诺威自动化有限公司 | Modified MC (monomer casting) nylon guide wheel, preparation technology and preparation device of modified MC nylon guide wheel |
| CN104260256A (en) * | 2014-07-18 | 2015-01-07 | 四川高德特科技有限公司 | Manufacturing technology and equipment for steel lining polyurethane composite tube |
| US20150165651A1 (en) * | 2012-07-05 | 2015-06-18 | Georgia Tech Research Corporation | Method for Processing Single Nylon 6 Composites |
| CN206122653U (en) * | 2016-11-15 | 2017-04-26 | 四川三洲川化机核能设备制造有限公司 | Heavy -calibre centrifugation cast tube shedder |
| CN107474243A (en) * | 2017-08-23 | 2017-12-15 | 江苏易元新材料科技有限公司 | Monomer moulding casting nylon, nylon wheel, the preparation method and application of nylon wheel |
| CN109694570A (en) * | 2018-12-25 | 2019-04-30 | 江苏利德尔新材料科技有限公司 | A kind of high intensity super abrasive MC nylon composite materials and preparation method thereof |
| CN109927225A (en) * | 2017-12-15 | 2019-06-25 | 四川斯派恩新材料有限公司 | A kind of centrifugal casting nylon pipeline stripping manipulator |
-
2019
- 2019-11-20 CN CN201911140079.7A patent/CN110843162A/en not_active Withdrawn
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1151931A (en) * | 1995-12-13 | 1997-06-18 | 潮安县科技尼龙制品厂 | Prodn of cast nylon pipe |
| JPH11262927A (en) * | 1998-03-17 | 1999-09-28 | Nippon Zeon Co Ltd | Reactive polymerization molding method and tubular molded object |
| US20150165651A1 (en) * | 2012-07-05 | 2015-06-18 | Georgia Tech Research Corporation | Method for Processing Single Nylon 6 Composites |
| CN102942693A (en) * | 2012-12-07 | 2013-02-27 | 许昌汉诺威自动化有限公司 | Modified MC (monomer casting) nylon guide wheel, preparation technology and preparation device of modified MC nylon guide wheel |
| CN104260256A (en) * | 2014-07-18 | 2015-01-07 | 四川高德特科技有限公司 | Manufacturing technology and equipment for steel lining polyurethane composite tube |
| CN206122653U (en) * | 2016-11-15 | 2017-04-26 | 四川三洲川化机核能设备制造有限公司 | Heavy -calibre centrifugation cast tube shedder |
| CN107474243A (en) * | 2017-08-23 | 2017-12-15 | 江苏易元新材料科技有限公司 | Monomer moulding casting nylon, nylon wheel, the preparation method and application of nylon wheel |
| CN109927225A (en) * | 2017-12-15 | 2019-06-25 | 四川斯派恩新材料有限公司 | A kind of centrifugal casting nylon pipeline stripping manipulator |
| CN109694570A (en) * | 2018-12-25 | 2019-04-30 | 江苏利德尔新材料科技有限公司 | A kind of high intensity super abrasive MC nylon composite materials and preparation method thereof |
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Application publication date: 20200228 |