CN117230398A - Repairing process for heat exchange spraying wear-resistant coating of wear-resistant belt of gas turbine - Google Patents
Repairing process for heat exchange spraying wear-resistant coating of wear-resistant belt of gas turbine Download PDFInfo
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- CN117230398A CN117230398A CN202311088395.0A CN202311088395A CN117230398A CN 117230398 A CN117230398 A CN 117230398A CN 202311088395 A CN202311088395 A CN 202311088395A CN 117230398 A CN117230398 A CN 117230398A
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- wear
- resistant coating
- coating
- gas turbine
- heat exchange
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- 238000000576 coating method Methods 0.000 title claims abstract description 97
- 239000011248 coating agent Substances 0.000 title claims abstract description 96
- 238000000034 method Methods 0.000 title claims abstract description 49
- 230000008569 process Effects 0.000 title claims abstract description 40
- 238000005507 spraying Methods 0.000 title claims abstract description 21
- 238000005488 sandblasting Methods 0.000 claims abstract description 18
- 230000008439 repair process Effects 0.000 claims abstract description 16
- 239000002253 acid Substances 0.000 claims abstract description 11
- 238000005530 etching Methods 0.000 claims abstract description 10
- 238000007751 thermal spraying Methods 0.000 claims abstract description 9
- 239000000853 adhesive Substances 0.000 claims abstract description 7
- 230000001070 adhesive effect Effects 0.000 claims abstract description 7
- 239000007921 spray Substances 0.000 claims description 12
- 238000012360 testing method Methods 0.000 claims description 12
- 238000004140 cleaning Methods 0.000 claims description 11
- 238000007514 turning Methods 0.000 claims description 6
- NPXOKRUENSOPAO-UHFFFAOYSA-N Raney nickel Chemical compound [Al].[Ni] NPXOKRUENSOPAO-UHFFFAOYSA-N 0.000 claims description 5
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 4
- 238000007689 inspection Methods 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 229910017604 nitric acid Inorganic materials 0.000 claims description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 11
- 238000007789 sealing Methods 0.000 description 18
- 238000013461 design Methods 0.000 description 11
- 238000003754 machining Methods 0.000 description 9
- 238000012545 processing Methods 0.000 description 9
- 238000005299 abrasion Methods 0.000 description 8
- 239000004809 Teflon Substances 0.000 description 7
- 229920006362 Teflon® Polymers 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 230000003068 static effect Effects 0.000 description 6
- 238000001514 detection method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 4
- 238000001917 fluorescence detection Methods 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 239000003921 oil Substances 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000003082 abrasive agent Substances 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 238000011179 visual inspection Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
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- 238000005520 cutting process Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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- 238000010438 heat treatment Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007750 plasma spraying Methods 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
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- 238000007788 roughening Methods 0.000 description 1
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Abstract
The invention relates to a repair process for a heat exchange spraying wear-resistant coating of a wear-resistant belt of a gas turbine, which comprises the following specific steps: s1: removing the old wear-resistant coating on the part; s2: sand blasting is carried out on the part to remove residual adhesive on the part; s3: carrying out acid etching treatment on the parts; s4: carrying out sand blasting treatment on a coating area of the part; s5: and carrying out thermal spraying treatment on the parts to form a new wear-resistant coating. The invention has the beneficial effects of simple process, and provides a process for automatically maintaining parts, which is convenient to maintain and high in efficiency.
Description
Technical Field
The invention relates to the technical field of gas turbine maintenance, in particular to a repair process for a heat exchange spraying wear-resistant coating of a wear-resistant belt of a gas turbine.
Background
The bearing cavity of the gas turbine compressor is sealed by two comb teeth, the first path is formed by sealing static lubricating oil of the bearing and sealing comb teeth of a 0-stage disk of the compressor, and the second path is formed by sealing static air of an A cavity and sealing comb teeth of a 0-stage disk of the compressor. The first sealing step is to balance the pressure of the oil gas in the No. 3 bearing cavity by means of the 9-stage bleed air of the air compressor (the 9-stage bleed air of the air compressor is led out from the 9-stage of the air compressor through a bleed air pipe and fills the cavity through the support column of the front frame of the air compressor), so that the sealing effect is achieved; the second seal seals the 9-stage bleed air in the chamber to ensure 9-stage bleed air pressure in the chamber.
The leakage of the second seal can cause the 9-stage bleed air pressure of the compressor in the cavity to be reduced, so that the first seal is invalid, oil gas in the bearing cavity is caused to leak, the running safety of the combustion engine cannot be affected, the oil gas can pass through the second seal to enter the compressor duct, and the oil gas is attached to the compressor blades, the hub and the casing, so that the lubricating oil consumption is increased.
When the combustion engine runs, the sealing comb teeth are subjected to centrifugal load and creep, so that gaps between the sealing comb teeth and the static sealing teeth are reduced, friction is generated, the comb teeth are protected, the abrasion loss of the comb teeth is reduced, and an abradable coating is coated on the static sealing surface during the design of the combustion engine. The A chamber static air seal related to the project protects the comb teeth in a mode of adhering a Teflon abrasion-resistant belt, and the Teflon is a high polymer material and has good heat resistance, abrasion resistance, corrosion resistance and low friction coefficient. However, in practical application, the durable adhesive is poor, so that the teflon wear-resistant belt falls off when the gas turbine runs for a long time, and the sealing of the bearing cavity is disabled.
In the traditional method, the A chamber still air seal is used for replacing the Teflon abrasion-resistant belt, foreign repair is needed, and the repair period is long. The invention aims to develop a whole set of detailed A chamber static air sealing thermal spraying abrasion-resistant belt recovery process, which comprises the steps of selecting a powder type, determining a coating quality requirement, determining spraying process parameters, designing a manufacturing machine tool and the like.
Disclosure of Invention
The invention aims to solve the technical problem of providing a repair process for heat exchange spraying wear-resistant coatings of wear-resistant belts of gas turbines, and aims to solve the problem in the prior art.
The technical scheme for solving the technical problems is as follows:
a repairing process for a heat exchange spraying wear-resistant coating of a wear-resistant belt of a gas turbine comprises the following specific steps:
s1: removing the old wear-resistant coating on the part;
s2: sand blasting is carried out on the part to remove residual adhesive on the part;
s3: carrying out acid etching treatment on the parts;
s4: carrying out sand blasting treatment on a coating area of the part;
s5: and carrying out thermal spraying treatment on the parts to form a new wear-resistant coating.
The beneficial effects of the invention are as follows: in the processing process, the process provided by the invention can rapidly remove the wear-resistant sealing coating on the surface of the part, and can form a new coating on the part again, thereby ensuring the working performance of the part.
The invention has simple process, provides a process for automatically maintaining parts, and has convenient maintenance and high efficiency.
On the basis of the technical scheme, the invention can be improved as follows.
Further, between S2 and S3, further includes: and cleaning the parts.
The further scheme has the beneficial effects of simple process and reasonable design, and can remove the residual abrasive materials and impurities on the surface of the part by cleaning, thereby ensuring the smooth proceeding of the subsequent process.
Further, between S3 and S4, further includes: the coated areas of the part were subjected to a fluorescent penetrant inspection to determine if the part was damaged.
The further scheme has the beneficial effects of simple process and reasonable design, and whether the part is damaged or not can be confirmed through fluorescence detection.
Further, the step S5 further includes step S6: and (3) spraying a wear-resistant coating on the metal wafer according to the same method as the method from S1 to S5 to form a coating test piece, and performing metallographic examination on the coating test piece to verify the quality of the wear-resistant coating.
The technical scheme has the beneficial effects of simple process, reasonable design and capability of detecting the performance of the coating through metallographic examination.
Further, the step S6 further includes step S7: turning the coating to finished dimensions.
The further scheme has the beneficial effects of simple process, and the coating is refurbished to ensure the quality of the finished product.
Further, S8 is further included after S7: and removing burrs formed during spraying on the parts.
The technical scheme has the beneficial effects of simple process and reasonable design, and the quality of part processing is further improved.
Further, S9 is further included after S8: and cleaning the parts.
The technical scheme has the beneficial effects of simple process and reasonable design, and impurities on the surface of the part are further removed, so that the quality of the part processing is further improved.
Further, in both S2 and S4, 120-180 mesh alumina abrasive is adopted to carry out sand blasting treatment on the parts.
The adoption of the further scheme has the beneficial effects that the types and the granularity of the aluminum chloride abrasive are reasonably selected, and the sand blasting effect is ensured.
Further, the acid etching in the step S3 adopts 0.10-0.50mol/L nitric acid wiping for 10-30 seconds.
The further scheme has the beneficial effects that the acid etching selection is reasonable, and the quality of part processing is ensured.
Further, the wear-resistant coating in S5 is a nickel-aluminum coating.
The nickel-aluminum coating has the beneficial effect of good wear resistance and sealing property.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in a specific case.
The invention will be described in detail below with reference to the drawings in connection with embodiments.
Example 1
As shown in fig. 1, the embodiment provides a repairing process for a heat exchange spraying wear-resistant coating of a wear-resistant belt of a gas turbine, which comprises the following specific steps:
s1: removing the old wear-resistant coating on the part;
s2: sand blasting is carried out on the part to remove residual adhesive on the part;
s3: carrying out acid etching treatment on the parts;
s4: carrying out sand blasting treatment on a coating area of the part;
s5: and carrying out thermal spraying treatment on the parts to form a new wear-resistant coating.
In the processing process, the process provided by the embodiment can rapidly remove the wear-resistant sealing coating on the surface of the part, and can form a new coating on the part again, so that the working performance of the part is ensured.
The embodiment has simple process, provides a process for automatically maintaining the parts, and has convenient maintenance and high efficiency.
Example 2
On the basis of embodiment 1, in this embodiment, between S2 and S3, further includes: and cleaning the parts.
The scheme has simple process and reasonable design, and can remove the residual abrasive materials and impurities on the surface of the part by cleaning, thereby ensuring the smooth proceeding of the subsequent process.
Preferably, the part is washed by the water gun in the embodiment, and water sprayed by the water gun has certain pressure, so that the part washing effect is ensured.
Example 3
On the basis of the foregoing embodiments, in this embodiment, the step of between S3 and S4 further includes: the coated areas of the part were subjected to a fluorescent penetrant inspection to determine if the part was damaged.
The process is simple, the design is reasonable, and whether the part is damaged or not can be confirmed through fluorescence detection.
Preferably, in this embodiment, the specific steps of fluorescence detection are as follows: brushing a layer of fluorescent liquid on the surface of the part, then irradiating the part through a black light lamp, and displaying if the part is damaged, otherwise, indicating that the part is not damaged.
Example 4
On the basis of the foregoing embodiments, in this embodiment, S5 further includes S6: and (3) spraying a wear-resistant coating on the metal wafer according to the same method as the method from S1 to S5 to form a coating test piece, and performing metallographic examination on the coating test piece to verify the quality of the wear-resistant coating.
The process is simple, the design is reasonable, and the performance of the coating can be detected through metallographic examination.
The metallographic examination adopts the prior art, and the specific principle is as follows: by adopting the principle of quantitative metallography, the three-dimensional space morphology of the alloy structure is determined by measuring and calculating the metallographic microstructure of the polished surface or the film of the two-dimensional metallographic specimen, so that the quantitative relation among alloy components, structures and performances is established. The technology not only greatly improves the accuracy of metallographic examination, but also improves the speed of the metallographic examination, and greatly shortens the working time.
Based on the scheme, when the part is sprayed to form the coating, the coating is sprayed on the metal wafer to be used as a test piece, the coating on the test piece is subjected to metallographic detection, and the detection result related to the test piece is the detection result of the coating on the part.
Example 5
On the basis of embodiment 4, in this embodiment, S7 further includes S7 after S6: turning the coating to finished dimensions.
The process is simple, and the coating is renovated to ensure the quality of the finished product.
Example 6
On the basis of embodiment 5, in this embodiment, S7 further includes S8: and removing burrs formed during spraying on the parts.
The process is simple, the design is reasonable, and the quality of part processing is further improved.
The present embodiment is to manually remove burrs formed during spraying on the parts, for example by sanding.
Example 7
On the basis of embodiment 6, in this embodiment, S9 further includes, after S8: and cleaning the parts.
The process is simple, the design is reasonable, and impurities on the surface of the part are further removed, so that the quality of the part processing is further improved.
Preferably, the part is washed by the water gun in the embodiment, and water sprayed by the water gun has certain pressure, so that the part washing effect is ensured.
Example 8
In this embodiment, in the foregoing embodiments, the step S2 and the step S4 are performed by using 120-180 mesh alumina abrasive to perform sand blasting on the part.
The type and granularity of the aluminum chloride abrasive are selected reasonably, so that the sand blasting effect is ensured.
Example 9
In this embodiment, the acid etching in S3 is performed by wiping with 0.10-0.50mol/L nitric acid for 10-30 seconds.
The acid etching selection is reasonable, and the quality of part processing is ensured.
Preferably, in the present embodiment, the nitric acid is preferably at a concentration of 0.35mol/L
Example 10
Based on the above embodiments, in this embodiment, the wear-resistant coating in S5 is a nickel-aluminum coating.
The nickel-aluminum coating has good wear resistance and sealing property.
The thermal spraying technology is defined in national standard GB/T18719-2002 "thermal spraying terminology, classification": thermal spraying is a method of forming a coating by heating a spray material to a molten or semi-molten state using a heat source and spray depositing the spray material onto a pretreated substrate surface at a certain rate.
The process flow of the invention is as follows:
(1) Removing the old wear-resistant coating on the part;
(2) Sand blasting is carried out on the part to remove residual adhesive on the part;
(3) Cleaning the parts;
(4) Carrying out acid etching treatment on the parts;
(5) Performing fluorescent penetration inspection on a coating area of the part;
(6) Carrying out sand blasting treatment on a coating area of the part;
(7) Carrying out thermal spraying treatment on the parts to form a new wear-resistant coating;
(8) Performing metallographic examination on the coating test piece;
(9) Turning the coating to a finished size;
(10) Removing burrs formed during spraying on the parts;
(11) And cleaning the parts.
The invention adopts mechanical or manual sand blasting to remove the original Teflon abrasion-resistant belt and adhesive film; acid etching, fluorescence detection, visual inspection and size detection are carried out on the sealed matrix of the cavity A; carrying out sand blasting roughening on the surface of the substrate in the repair area, and then adopting plasma spraying to coat a wear-resistant coating; carrying out metallographic analysis, hardness measurement and adhesive strength tensile test on the spray coating test piece; machining the wear-resistant coating to a usable range by adopting a turning mode; removing burrs at the edges of the coating by adopting a manual tool to enable the coating to be in smooth transition; carrying out high-pressure water cleaning on the air seal of the chamber A to remove coating powder generated by machining; and rechecking the size of the wear-resistant coating by adopting three coordinates.
The invention aims to develop a whole set of detailed A-chamber air seal coating to replace Teflon wear-resisting belt process, and the content comprises the steps of determining the size of the coating, the type and quality requirements of the coating, sand blasting, spraying and machining process parameters, designing a special tool for manufacturing machine machining and the like.
The invention has the advantages that:
the verification is needed after the A chamber air seal is coated with the wear-resistant coating, and the content comprises the diameter size of the wear-resistant coating, the bonding strength of the wear-resistant coating, the metallographic structure and the hardness of the wear-resistant coating.
And after finishing machining, checking the diameter size of the wear-resistant coating by using three coordinates, wherein the diameter size of the machined coating is 220.21mm, the usable range is 220.17mm-220.27mm, and the size requirement is met.
The average bonding strength of the wear-resistant coating is 36.47Mpa, and the minimum bonding strength is 34.5Mpa specified by a standard process; the average hardness of the wear-resistant coating is 71.67R15Y, the standard process requirement is 65-80R15Y, and various indexes meet the process requirement.
The specific requirements of the process provided by the invention are as follows:
(1) Designing and manufacturing a part machining tool according to the part structure and machining requirements, and ensuring that the tool precision meets the machining requirements;
(2) The type of the spraying powder is properly selected, the abrasion to the sealing comb teeth of the 0-level disc of the compressor is caused by the excessive hardness of the coating, and the coating is separated due to insufficient bonding strength, so that the sealing failure is caused;
(3) And determining process parameters, wherein the quality of the coating meets the use requirements, including hardness, bonding strength, porosity and the like.
The invention needs to pay attention to the following matters in the processing process:
(1) The substrate from which the teflon abrasion resistant tape was removed was subjected to fluorescence penetration detection, visual inspection and dimensional measurement to ensure that the substrate was not damaged and to confirm the minimum thickness of the coating to be applied.
(2) The sand blasting is used for protecting non-repair areas and avoiding damage to other areas.
(3) The spraying technological parameters are determined by adopting a test piece method, and various indexes of the coating meet the requirements specified in the standard process by continuously adjusting the technological parameters.
(4) Turning refers to machining parameters of other parts with the same coating, and coating falling caused by overlarge cutting amount is avoided.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (10)
1. The repairing process of the heat exchange spraying wear-resistant coating of the wear-resistant belt of the gas turbine is characterized by comprising the following specific steps of:
s1: removing the old wear-resistant coating on the part;
s2: sand blasting is carried out on the part to remove residual adhesive on the part;
s3: carrying out acid etching treatment on the parts;
s4: carrying out sand blasting treatment on a coating area of the part;
s5: and carrying out thermal spraying treatment on the parts to form a new wear-resistant coating.
2. The gas turbine wear strip heat exchange spray wear resistant coating repair process of claim 1, further comprising between S2 and S3: and cleaning the parts.
3. The gas turbine wear strip heat exchange spray wear resistant coating repair process of claim 1, further comprising between S3 and S4: the coated areas of the part were subjected to a fluorescent penetrant inspection to determine if the part was damaged.
4. A gas turbine wear strip heat exchange spray wear resistant coating repair process according to any one of claims 1-3, wherein said S5 further comprises S6: and (3) spraying a wear-resistant coating on the metal wafer according to the same method as the method from S1 to S5 to form a coating test piece, and performing metallographic examination on the coating test piece to verify the quality of the wear-resistant coating.
5. The gas turbine engine wear strip heat exchange spray wear resistant coating repair process of claim 4, wherein said S6 further comprises S7: turning the coating to finished dimensions.
6. The gas turbine wear strip heat exchange spray wear resistant coating repair process of claim 5, wherein said S7 further comprises S8: and removing burrs formed during spraying on the parts.
7. The gas turbine wear strip heat exchange spray wear resistant coating repair process of claim 6, wherein said S8 further comprises S9: and cleaning the parts.
8. A gas turbine wear strip heat exchange spray wear resistant coating repair process according to any one of claims 1 to 3 wherein the parts are sandblasted with 120-180 mesh alumina abrasive used in both S2 and S4.
9. A gas turbine wear strip heat exchange spray wear resistant coating repair process according to any one of claims 1-3, wherein said S3 acid etch is performed with 0.10-0.50mol/L nitric acid for 10-30 seconds.
10. A gas turbine wear strip heat exchange spray wear resistant coating repair process according to any one of claims 1-3 wherein the wear resistant coating in S5 is a nickel-aluminum coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311088395.0A CN117230398A (en) | 2023-08-28 | 2023-08-28 | Repairing process for heat exchange spraying wear-resistant coating of wear-resistant belt of gas turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311088395.0A CN117230398A (en) | 2023-08-28 | 2023-08-28 | Repairing process for heat exchange spraying wear-resistant coating of wear-resistant belt of gas turbine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117230398A true CN117230398A (en) | 2023-12-15 |
Family
ID=89095774
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311088395.0A Pending CN117230398A (en) | 2023-08-28 | 2023-08-28 | Repairing process for heat exchange spraying wear-resistant coating of wear-resistant belt of gas turbine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117230398A (en) |
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2023
- 2023-08-28 CN CN202311088395.0A patent/CN117230398A/en active Pending
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