CN111534843A - Anti-deterioration steel cord and processing method thereof - Google Patents
Anti-deterioration steel cord and processing method thereof Download PDFInfo
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- CN111534843A CN111534843A CN202010415906.5A CN202010415906A CN111534843A CN 111534843 A CN111534843 A CN 111534843A CN 202010415906 A CN202010415906 A CN 202010415906A CN 111534843 A CN111534843 A CN 111534843A
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- steel wire
- wire
- copper
- plating
- zinc
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 78
- 239000010959 steel Substances 0.000 title claims abstract description 78
- 238000003672 processing method Methods 0.000 title abstract description 5
- 238000000576 coating method Methods 0.000 claims abstract description 39
- 239000011248 coating agent Substances 0.000 claims abstract description 37
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 32
- 229910052802 copper Inorganic materials 0.000 claims abstract description 32
- 239000010949 copper Substances 0.000 claims abstract description 32
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 26
- 239000011701 zinc Substances 0.000 claims abstract description 26
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 21
- 239000000956 alloy Substances 0.000 claims abstract description 21
- 230000006866 deterioration Effects 0.000 claims abstract description 9
- 238000007747 plating Methods 0.000 claims description 51
- 238000005491 wire drawing Methods 0.000 claims description 18
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 13
- 229910052782 aluminium Inorganic materials 0.000 claims description 13
- 238000004140 cleaning Methods 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 8
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 7
- 229910052717 sulfur Inorganic materials 0.000 claims description 7
- 239000011593 sulfur Substances 0.000 claims description 7
- 239000002994 raw material Substances 0.000 claims description 6
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 229910000838 Al alloy Inorganic materials 0.000 claims description 4
- 229910001369 Brass Inorganic materials 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 3
- RAOSIAYCXKBGFE-UHFFFAOYSA-K [Cu+3].[O-]P([O-])([O-])=O Chemical compound [Cu+3].[O-]P([O-])([O-])=O RAOSIAYCXKBGFE-UHFFFAOYSA-K 0.000 claims description 3
- 239000010951 brass Substances 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 230000007547 defect Effects 0.000 claims description 3
- 238000005246 galvanizing Methods 0.000 claims description 3
- 229910052748 manganese Inorganic materials 0.000 claims description 3
- 239000011572 manganese Substances 0.000 claims description 3
- 238000010301 surface-oxidation reaction Methods 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 claims description 3
- 229960001763 zinc sulfate Drugs 0.000 claims description 3
- 229910000368 zinc sulfate Inorganic materials 0.000 claims description 3
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 2
- 229910052796 boron Inorganic materials 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- 238000005554 pickling Methods 0.000 claims description 2
- 238000010791 quenching Methods 0.000 claims description 2
- 230000000171 quenching effect Effects 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 238000011010 flushing procedure Methods 0.000 claims 1
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- OMZSGWSJDCOLKM-UHFFFAOYSA-N copper(II) sulfide Chemical compound [S-2].[Cu+2] OMZSGWSJDCOLKM-UHFFFAOYSA-N 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 125000000101 thioether group Chemical group 0.000 description 2
- 229910000611 Zinc aluminium Inorganic materials 0.000 description 1
- JRBRVDCKNXZZGH-UHFFFAOYSA-N alumane;copper Chemical compound [AlH3].[Cu] JRBRVDCKNXZZGH-UHFFFAOYSA-N 0.000 description 1
- HXFVOUUOTHJFPX-UHFFFAOYSA-N alumane;zinc Chemical compound [AlH3].[Zn] HXFVOUUOTHJFPX-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D7/00—Electroplating characterised by the article coated
- C25D7/06—Wires; Strips; Foils
- C25D7/0607—Wires
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/22—Electroplating: Baths therefor from solutions of zinc
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/42—Electroplating: Baths therefor from solutions of light metals
- C25D3/44—Aluminium
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/56—Electroplating: Baths therefor from solutions of alloys
- C25D3/565—Electroplating: Baths therefor from solutions of alloys containing more than 50% by weight of zinc
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/56—Electroplating: Baths therefor from solutions of alloys
- C25D3/58—Electroplating: Baths therefor from solutions of alloys containing more than 50% by weight of copper
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/10—Electroplating with more than one layer of the same or of different metals
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Ropes Or Cables (AREA)
Abstract
The invention provides a deterioration-resistant steel cord and a processing method thereof, which comprises a steel wire, a copper coating electroplated on the steel wire, a zinc coating plated on the copper coating and an alloy coating arranged on the zinc coating.
Description
Technical Field
The invention relates to the field of steel cord processing, in particular to an anti-deterioration steel cord and a processing method thereof.
Background
The steel cord is an important framework supporting material in the tire, and as the particularity of the use environment of the tire, the main performance requirements of the steel cord are corrosion resistance, fatigue resistance and elastic strength, wherein the most difficult optimization is the corrosion resistance and the fatigue resistance, the two performances are always in a certain commonality and can also be called as the anti-deterioration performance of the steel cord, the service life of the tire is continuously prolonged to adapt to the market requirements of different severe environments, and the important importance of a steel cord manufacturer is to continuously improve the anti-deterioration performance of the product per se so as to realize the service life and the quality of the derivative product tire, the anti-deterioration steel cord is designed through innovating a production mode and a formula, so that the greater economic benefit can be obtained, and the market share of the product per se can be improved.
Disclosure of Invention
In view of the above technical problems, the present invention provides a deterioration resistant steel cord,
the method comprises the following steps:
the copper-clad wire comprises a steel wire, a copper clad layer electroplated on the steel wire, a zinc clad layer plated on the copper clad layer and an alloy clad layer arranged on the zinc clad layer, wherein the copper content in the copper clad layer is 60-70%, the diameter of the steel wire is 0.1-0.35 mm, the thickness of the copper clad layer is 120-350 nm, the porosity of the copper clad layer is 20-40%, the coverage rate of the zinc clad layer is lower than 40%, the thickness of the zinc clad layer is 5-20 nm, and the thickness of the alloy clad layer is 45-100 nm.
Preferably, the alloy plating layer is an aluminum alloy, and the aluminum content in the alloy plating layer is 5.5-10%.
A method for processing a deterioration resistant steel cord, comprising the steps of:
firstly, treating a raw material wire rod, namely, sequentially performing surface cleaning operation on the wire rod by using a wire rod raw material with the diameter of 5.5mm, the carbon content of 0.78-0.85%, the manganese content of 0.35-0.6%, the sulfur element content of less than 0.05%, the weight of a surface oxidation layer of less than 0.8% and the local defect depth of not more than 0.1 mm;
secondly, performing rough wire drawing treatment, fixing the cleaned wire rod on a spool, wherein the diameter of the spool is larger than 800mm, fixing the spool on a wire drawing machine, setting the linear speed of the equipment to be 1.5-2.2 m/s, drawing the wire rod into a steel wire with the diameter of 2.5-3.3 mm through multiple wire drawing, performing heat treatment on the steel wire, drawing the steel wire at the speed of 5-10 m/s, and drawing the steel wire into a steel wire with the diameter of 0.8-1.76 mm;
thirdly, plating brass, namely placing the steel wire in an open flame furnace, setting the temperature of the open flame furnace to be 400 ℃, immersing the steel wire in copper phosphate plating solution for pre-plating treatment after passing through the open flame furnace, plating a layer of compact pure copper in advance, and cleaning the surface plating solution after the pre-plating treatment to form a copper plating layer;
step four, galvanizing, namely immersing the steel wire into zinc sulfate plating solution, and heating by adopting electric contact to form a zinc coating;
fifthly, processing an alloy coating, adjusting the temperature of a naked flame to be lower than 400 ℃, immersing the steel wire into aluminum sulfate plating solution to form an aluminum coating, and forming the alloy coating with zinc atoms in the zinc coating after the aluminum coating is stable and reacts with the atoms;
sixthly, fine wire drawing treatment, placing the steel wire on a spool after plating, setting the wire drawing speed to be 12m/s to 20m/s, and preparing the plated steel wire with the diameter of 0.1mm to 0.35mm by at least 10 wire drawing dies;
seventhly, combining and bulging the steel wires into ropes, carrying out double-twisting doubling on the plated steel wires, and carrying out tension forming to prepare steel cords;
and eighthly, inspecting finished products.
Preferably, the surface cleaning operation comprises firstly mechanical descaling washing, secondly alternate electrolytic pickling, hot water washing, boron coating and finally drying treatment.
Preferably, when the heat treatment is carried out, oil is removed firstly, then the steel wire passes through an open fire furnace, the temperature in the open fire furnace is 900-1200 ℃, and after passing through the open fire furnace, the steel wire is immersed in lead liquid at the temperature of 600-650 ℃ for lead quenching treatment.
Has the advantages that:
1. compared with the copper and zinc coatings in the prior art, the aluminum coating is additionally coated, so that the corrosion resistance effect of the zinc-aluminum alloy coating formed by the atomic reaction between the aluminum coating and the zinc coating is better, and the loss of the sulfur content in the prior open flame oxidation can be effectively compensated by aluminum sulfate.
2. The invention controls the content of sulfur in the plating layer, forms sulfide between the plating layers, and the sulfide forms a layer of film, such as the film of copper sulfide can effectively inhibit the diffusion of copper at the next layer.
Drawings
The invention will be further described with reference to the accompanying drawings.
Fig. 1 is a schematic view of the overall structure of the present invention.
The figures in the drawings represent:
1. alloy coating 2, zinc coating 3, copper coating 4, steel wire.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "front", "rear", "left", "right", "upper", "lower", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
As shown in fig. 1, the present invention provides a deterioration-resistant steel cord, which is characterized by comprising a steel wire, a copper plating layer electroplated on the steel wire, a zinc plating layer plated on the copper plating layer, and an alloy plating layer disposed on the zinc plating layer, wherein the copper content in the copper plating layer is 60% to 70%, the diameter of the steel wire is 0.1mm to 0.35mm, the thickness of the copper plating layer is 120nm to 350nm, the porosity of the copper plating layer is 20% to 40%, the coverage of the zinc plating layer is less than 40%, the thickness of the zinc plating layer is 5nm to 20nm, the thickness of the alloy plating layer is 45nm to 100nm, the alloy plating layer is an aluminum alloy, and the aluminum content in the alloy plating layer is 5.5% to 10%.
The invention provides a processing method of an anti-deterioration steel cord, which comprises the following steps:
firstly, treating a raw material wire rod, namely, sequentially performing surface cleaning operation on the wire rod by using a wire rod raw material with the diameter of 5.5mm, the carbon content of 0.78-0.85%, the manganese content of 0.35-0.6%, the sulfur element content of less than 0.05%, the weight of a surface oxidation layer of less than 0.8% and the local defect depth of not more than 0.1 mm;
secondly, performing rough wire drawing treatment, fixing the cleaned wire rod on a spool, wherein the diameter of the spool is larger than 800mm, fixing the spool on a wire drawing machine, setting the linear speed of the equipment to be 1.5-2.2 m/s, drawing the wire rod into a steel wire with the diameter of 2.5-3.3 mm through multiple wire drawing, performing heat treatment on the steel wire, drawing the steel wire at the speed of 5-10 m/s, and drawing the steel wire into a steel wire with the diameter of 0.8-1.76 mm;
thirdly, plating brass, namely placing the steel wire in an open flame furnace, setting the temperature of the open flame furnace to be 400 ℃, immersing the steel wire in copper phosphate plating solution for pre-plating treatment after passing through the open flame furnace, plating a layer of compact pure copper in advance, and cleaning the surface plating solution after the pre-plating treatment to form a copper plating layer;
step four, galvanizing, namely immersing the steel wire into zinc sulfate plating solution, and heating by adopting electric contact to form a zinc coating;
fifthly, processing an alloy coating, adjusting the temperature of a naked flame to be lower than 400 ℃, immersing the steel wire into aluminum sulfate plating solution to form an aluminum coating, and forming the alloy coating with zinc atoms in the zinc coating after the aluminum coating is stable and reacts with the atoms;
sixthly, fine wire drawing treatment, placing the steel wire on a spool after plating, setting the wire drawing speed to be 12m/s to 20m/s, and preparing the plated steel wire with the diameter of 0.1mm to 0.35mm by at least 10 wire drawing dies;
seventhly, combining and bulging the steel wires into ropes, carrying out double-twisting doubling on the plated steel wires, and carrying out tension forming to prepare steel cords;
and eighthly, inspecting finished products.
Compared with the copper and zinc coatings in the prior art, the copper and zinc coating of the invention is additionally coated with one more aluminum coating, so that on one hand, the corrosion resistance effect of the copper-aluminum alloy coating formed by the atomic reaction between the aluminum coating and the zinc coating is better, and on the other hand, the loss of the sulfur content in the prior open flame oxidation can be effectively compensated by the aluminum sulfate.
The invention controls the content of sulfur in the plating layer, forms sulfide between the plating layers, and the sulfide forms a layer of film, such as the film of copper sulfide can effectively inhibit the diffusion of copper at the next layer.
Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention.
Claims (5)
1. A deterioration resistant steel cord characterized in that: the copper-clad steel wire comprises a steel wire, a copper clad layer electroplated on the steel wire, a zinc clad layer plated on the copper clad layer and an alloy clad layer arranged on the zinc clad layer, wherein the copper content in the copper clad layer is 60-70%, the diameter of the steel wire is 0.1-0.35 mm, the thickness of the copper clad layer is 120-350 nm, the porosity of the copper clad layer is 20-40%, the coverage rate of the zinc clad layer is lower than 40%, the thickness of the zinc clad layer is 5-20 nm, and the thickness of the alloy clad layer is 45-100 nm.
2. A deterioration resistant steel cord as claimed in claim 1, characterized in that: the alloy plating layer is an aluminum alloy, and the aluminum content in the alloy plating layer is 5.5-10%.
3. A method of processing a deterioration resistant steel cord according to claim 2, characterized in that: firstly, treating a raw material wire rod, namely, sequentially performing surface cleaning operation on the wire rod by using a wire rod raw material with the diameter of 5.5mm, the carbon content of 0.78-0.85%, the manganese content of 0.35-0.6%, the sulfur element content of less than 0.05%, the weight of a surface oxidation layer of less than 0.8% and the local defect depth of not more than 0.1 mm; secondly, performing rough wire drawing treatment, fixing the cleaned wire rod on a spool, wherein the diameter of the spool is larger than 800mm, fixing the spool on a wire drawing machine, setting the linear speed of the equipment to be 1.5-2.2 m/s, drawing the wire rod into a steel wire with the diameter of 2.5-3.3 mm through multiple wire drawing, performing heat treatment on the steel wire, drawing the steel wire at the speed of 5-10 m/s, and drawing the steel wire into a steel wire with the diameter of 0.8-1.76 mm; thirdly, plating brass, namely placing the steel wire in an open flame furnace, setting the temperature of the open flame furnace to be 400 ℃, immersing the steel wire in copper phosphate plating solution for pre-plating treatment after passing through the open flame furnace, plating a layer of compact pure copper in advance, and cleaning the surface plating solution after the pre-plating treatment to form a copper plating layer; step four, galvanizing, namely immersing the steel wire into zinc sulfate plating solution, and heating by adopting electric contact to form a zinc coating; fifthly, processing an alloy coating, adjusting the temperature of a naked flame to be lower than 400 ℃, immersing the steel wire into aluminum sulfate plating solution to form an aluminum coating, and forming the alloy coating with zinc atoms in the zinc coating after the aluminum coating is stable and reacts with the atoms; sixthly, fine wire drawing treatment, placing the steel wire on a spool after plating, setting the wire drawing speed to be 12m/s to 20m/s, and preparing the plated steel wire with the diameter of 0.1mm to 0.35mm by at least 10 wire drawing dies; seventhly, combining and bulging the steel wires into ropes, carrying out double-twisting doubling on the plated steel wires, and carrying out tension forming to prepare steel cords; and eighthly, inspecting finished products.
4. A method of processing a deterioration resistant steel cord according to claim 3, characterized in that: the surface cleaning operation comprises the steps of firstly carrying out mechanical descaling flushing, secondly carrying out alternate electrolytic pickling, hot water washing, boron coating and finally drying.
5. A method of processing a deterioration resistant steel cord according to claim 3, characterized in that: and removing oil during the heat treatment, then passing the steel wire through an open fire furnace, wherein the temperature in the open fire furnace is 900-1200 ℃, and after passing through the open fire furnace, immersing the steel wire into a lead liquid with the temperature of 600-650 ℃ for lead quenching treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010415906.5A CN111534843A (en) | 2020-05-16 | 2020-05-16 | Anti-deterioration steel cord and processing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010415906.5A CN111534843A (en) | 2020-05-16 | 2020-05-16 | Anti-deterioration steel cord and processing method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111534843A true CN111534843A (en) | 2020-08-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010415906.5A Pending CN111534843A (en) | 2020-05-16 | 2020-05-16 | Anti-deterioration steel cord and processing method thereof |
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| Country | Link |
|---|---|
| CN (1) | CN111534843A (en) |
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2020
- 2020-05-16 CN CN202010415906.5A patent/CN111534843A/en active Pending
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Application publication date: 20200814 |
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