CN112921374A - Anticorrosion treatment process for pipe network of water supply equipment - Google Patents

Anticorrosion treatment process for pipe network of water supply equipment Download PDF

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Publication number
CN112921374A
CN112921374A CN202110142277.8A CN202110142277A CN112921374A CN 112921374 A CN112921374 A CN 112921374A CN 202110142277 A CN202110142277 A CN 202110142277A CN 112921374 A CN112921374 A CN 112921374A
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CN
China
Prior art keywords
sliding plate
water supply
treatment process
pipe network
supply equipment
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202110142277.8A
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Chinese (zh)
Inventor
李丕
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanghai Shangrui Pump Group Co ltd
Original Assignee
Shanghai Shangrui Pump Group Co ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Shanghai Shangrui Pump Group Co ltd filed Critical Shanghai Shangrui Pump Group Co ltd
Priority to CN202110142277.8A priority Critical patent/CN112921374A/en
Publication of CN112921374A publication Critical patent/CN112921374A/en
Pending legal-status Critical Current

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    • 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
    • C25D7/04—Tubes; Rings; Hollow bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
    • B05B13/02—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work
    • B05B13/0221—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work characterised by the means for moving or conveying the objects or other work, e.g. conveyor belts
    • B05B13/0228—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work characterised by the means for moving or conveying the objects or other work, e.g. conveyor belts the movement of the objects being rotative
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B14/00—Arrangements for collecting, re-using or eliminating excess spraying material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/60—Arrangements for mounting, supporting or holding spraying apparatus
    • B05B15/68—Arrangements for adjusting the position of spray heads
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
    • C25D17/06—Suspending or supporting devices for articles to be coated
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D21/00—Processes for servicing or operating cells for electrolytic coating
    • C25D21/10—Agitating of electrolytes; Moving of racks
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
    • E03B7/00—Water main or service pipe systems

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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)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Details Or Accessories Of Spraying Plant Or Apparatus (AREA)

Abstract

The invention discloses a water supply equipment pipe network anticorrosion treatment process, and relates to the technical field of pipeline anticorrosion treatment equipment. According to the invention, the electroplating tank, the spraying head and the electric push rod are arranged, the pipeline main body is conveyed into the electroplating tank, electroplating solution is poured into the electroplating tank, the anode conductor and the cathode conductor are respectively electrified, a layer of metal can be plated on the outer wall of the pipeline main body and can be used for corrosion prevention, and then the outer wall of the pipeline main body is sprayed with corrosion prevention liquid, so that double corrosion prevention is realized, and the corrosion prevention effect is better.

Description

Anticorrosion treatment process for pipe network of water supply equipment
Technical Field
The invention relates to the technical field of pipeline anticorrosion treatment equipment, in particular to a water supply equipment pipe network anticorrosion treatment process.
Background
With the development of scientific technology and the progress of times, pipeline transportation technology is mature, in order to prolong the service life of pipelines, when pipelines for supply and drainage in cities, oil transportation in oil fields and water injection in water fields are produced, anticorrosive coatings are required to be sprayed outside the pipelines for anticorrosive treatment, and therefore a water supply equipment pipe network anticorrosive treatment process is provided.
The existing water supply equipment pipe network anticorrosion treatment process is single in anticorrosion mode and poor in anticorrosion effect, and the anticorrosion liquid of the water supply equipment pipe network anticorrosion treatment process is not uniformly smeared in the anticorrosion treatment process, so that the outer wall of a pipeline is rough and not attractive enough.
Disclosure of Invention
The invention aims to solve the defects that the existing anticorrosion treatment process for the pipe network of the water supply equipment has a single anticorrosion mode and a poor anticorrosion effect, and the anticorrosion liquid is not uniformly coated in the anticorrosion treatment process of the pipe network of the water supply equipment, so that the outer wall of a pipeline is rough and not beautiful enough.
In order to achieve the purpose, the invention adopts the following technical scheme:
a water supply equipment pipe network antiseptic treatment process comprises a first sliding plate, wherein an electric push rod is fixed above the first sliding plate, the bottom of the electric push rod is movably connected with a spraying head, the bottom of the first sliding plate is movably connected with a first sliding block, the bottom of the first sliding block is connected with a second sliding plate, the first sliding plate penetrates through a transmission rod from top to bottom, a first gear is installed on the right side of the transmission rod, a second gear is installed on the left side of the first gear in a matched mode, a second servo motor is connected to the center of the second gear, a coating disc is connected to the bottom of the transmission rod, a movable roller is movably connected to the inner portion of the coating disc, a first servo motor is connected to the center of the movable roller, a second sliding block is movably connected to the inner side of the second sliding plate, the left end of the second sliding block is connected with a connecting rod, the second sliding block is connected with, and the inboard swing joint of clamp splice has the pipeline main part, the bottom both sides of first slide are connected with the bracing piece, and the inboard welding of bracing piece has the connective bar, the bracing piece is connected with the electroplating bath through the connective bar, and the inside left side right side of electroplating bath is provided with the positive pole electric conductor, the negative pole electric conductor has been installed on the inside left side of electroplating bath, and the inboard in electroplating bath installs the fixed strip, the external connection elastic sheath of fixed strip, and the fixed strip is connected with the magnetic stripe through elastic sheath.
Preferably, the spraying head and the first sliding plate form a lifting structure through an electric push rod, and the spraying head is rotatably connected with the electric push rod.
Preferably, sliding connection is adopted between the first sliding block and the first sliding plate, and the top of the first sliding block is tightly attached to the bottom of the first sliding plate.
Preferably, a lifting structure is formed between the smearing disc and the first sliding plate through a transmission rod, and the length of the smearing disc is consistent with that of the pipeline main body.
Preferably, a moving structure is formed between the clamping blocks and the second sliding plate through connecting rods and second sliding blocks, and the clamping blocks are symmetrically distributed in two groups about a central axis of the first sliding plate.
Preferably, an elastic structure is formed between the magnetic strips and the fixing strips through elastic sheaths, and two groups of the magnetic strips are symmetrically distributed around the central axis of the electroplating pool.
Preferably, the diameter of the smearing plate is larger than that of the pipeline main body, and the outer wall of the pipeline main body is tightly attached to the outer wall of the movable roller.
Preferably, the transmission rod and the second gear are in meshing transmission, and the center of the second gear is tightly connected with the second servo motor.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. according to the invention, the electroplating tank, the spraying head and the electric push rod are arranged, the pipeline main body is conveyed into the electroplating tank, electroplating solution is poured into the electroplating tank, the anode conductor and the cathode conductor are respectively electrified, a layer of metal can be plated on the outer wall of the pipeline main body and can be used for corrosion prevention, and then the outer wall of the pipeline main body is sprayed with corrosion prevention liquid, so that double corrosion prevention is realized, and the corrosion prevention effect is better.
2. According to the invention, the coating disc, the movable roller, the first servo motor and the pipeline main body are arranged, the first servo motor is started, the first servo motor drives the movable roller to rotate, the spraying head is opened, the spraying head sprays the anti-corrosion liquid between the coating disc and the pipeline main body, the movable roller can drive the pipeline main body to rotate through friction, and then the sprayed anti-corrosion liquid can be uniformly distributed on the outer wall of the pipeline main body, so that the outer wall of the pipeline main body is smooth and attractive.
3. According to the invention, the magnetic strip, the elastic sheath, the fixing strip and the electroplating pool are arranged, after electroplating is finished, the pipeline main body is separated from the electroplating pool, the magnetic strip is moved oppositely, the elastic sheath is unfolded, and thus, excessive anticorrosion liquid can be prevented from dropping on the elastic sheath, the anticorrosion liquid can not enter the electroplating pool, and the next electroplating can not be influenced.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic top view of the electroplating tank of the present invention;
FIG. 3 is a schematic view of the internal structure of the applying pan of the present invention;
FIG. 4 is an enlarged view of the portion A of FIG. 1 according to the present invention.
Illustration of the drawings:
1. an electric push rod; 2. a transmission rod; 3. a first slider; 4. a first slide plate; 5. a spray head; 6. a support bar; 7. a second slider; 8. a connecting rod; 9. an anode conductor; 10. a connecting rod; 11. a clamping block; 12. an electroplating pool; 13. a pipe body; 14. a cathode conductor; 15. a second slide plate; 16. coating a disc; 17. a fixing strip; 18. an elastic sheath; 19. a magnetic strip; 20. a movable roller; 21. a first servo motor; 22. a first gear; 23. a second gear; 24. a second servo motor.
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 of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-4, a water supply equipment pipe network antiseptic treatment process comprises an electric push rod 1, a transmission rod 2, a first slide block 3, a first sliding plate 4, a spraying head 5, a support rod 6, a second slide block 7, a connecting rod 8, an anode conductor 9, a connecting rod 10, a clamping block 11, an electroplating pool 12, a pipeline main body 13, a cathode conductor 14, a second sliding plate 15, a smearing disc 16, a fixed strip 17, an elastic sheath 18, a magnetic strip 19, a movable roller 20, a first servo motor 21, a first gear 22, a second gear 23 and a second servo motor 24, wherein the electric push rod 1 is fixed above the first sliding plate 4, the spraying head 5 is movably connected to the bottom of the electric push rod 1, the first slide block 3 is movably connected to the bottom of the first sliding plate 4, the second sliding plate 15 is connected to the bottom of the first slide block 3, the transmission rod 2 penetrates through the first sliding plate 4 from top to bottom, and the first gear 22 is installed on the right side, a second gear 23 is arranged on the left side of the first gear 22 in a matched manner, a second servo motor 24 is connected at the center of the second gear 23, the bottom of the transmission rod 2 is connected with the smearing plate 16, the inner part of the smearing plate 16 is movably connected with the movable roller 20, the center of the movable roller 20 is connected with the first servo motor 21, the inner side of the second sliding plate 15 is movably connected with the second sliding block 7, the left end of the second sliding block 7 is connected with the connecting rod 10, the second sliding block 7 is connected with the clamping block 11 through the connecting rod 10, the inner side of the clamping block 11 is movably connected with the pipeline main body 13, two sides of the bottom of the first sliding plate 4 are connected with supporting rods 6, the inner sides of the supporting rods 6 are welded with connecting rods 8, the supporting rods 6 are connected with an electroplating pool 12 through the connecting rods 8, an anode conductor 9 is arranged on the right side of the inner, and the inboard of electroplating bath 12 is installed fixed strip 17, and the outside of fixed strip 17 is connected with elasticity sheath 18, and fixed strip 17 is connected with magnetic stripe 19 through elasticity sheath 18.
As shown in fig. 1, a lifting structure is formed between the spraying head 5 and the first sliding plate 4 through the electric push rod 1, and the spraying head 5 and the electric push rod 1 are connected in a rotating manner, the lifting structure ensures that the spraying head 5 can be driven by the electric push rod 1 to move up and down, the rotating connection ensures that the spraying head 5 can rotate around the joint with the electric push rod 1, and further the spraying angle of the spraying head 5 can be adjusted.
As shown in fig. 1, the first slider 3 is in sliding connection with the first sliding plate 4, and the top of the first slider 3 is tightly attached to the bottom of the first sliding plate 4, and the sliding connection ensures that the first slider 3 can freely move at the bottom of the first sliding plate 4, and further can drive the second sliding plate 15 to move in the opposite direction and in the opposite direction, so that the tight attachment ensures the stability of the first slider 3 during the moving process.
As shown in fig. 1, a lifting structure is formed between the smearing disc 16 and the first sliding plate 4 through the transmission rod 2, the length of the smearing disc 16 is consistent with that of the pipeline body 13, the lifting structure ensures that the smearing disc 16 can be driven by the transmission rod 2 to move up and down, and the consistent length ensures that the smearing disc 16 can uniformly distribute the sprayed anticorrosive liquid on the outer wall of the pipeline body 13.
As shown in fig. 1, a moving structure is formed between the clamping block 11 and the second sliding plate 15 through the connecting rod 10 and the second sliding block 7, and the clamping block 11 is symmetrically distributed in two groups about the central axis of the first sliding plate 4, and the moving structure ensures that the second sliding block 7 can drive the clamping block 11 to move up and down in the up-and-down moving process of the second sliding plate 15, so that the clamping block 11 can drive the pipeline body 13 to enter the electroplating pool 12.
As shown in fig. 2, an elastic structure is formed between the magnetic strips 19 and the fixing strips 17 through the elastic sheath 18, and two groups of magnetic strips 19 are symmetrically distributed about the central axis of the electroplating tank 12, and the elastic structure ensures that after the magnetic strips 19 are separated, the magnetic strips 19 can move back under the elastic action of the elastic sheath 18, so that the elastic sheath 18 contracts.
As shown in fig. 3, the diameter of the coating disc 16 is greater than that of the pipeline main body 13, the outer wall of the pipeline main body 13 is tightly attached to the outer wall of the movable roller 20, the diameter of the coating disc 16 is greater than that of the pipeline main body 13, the pipeline main body 13 can enter the coating disc 16, the outer wall of the pipeline main body 13 is tightly attached to the outer wall of the movable roller 20, the movable roller 20 can drive the pipeline main body 13 to rotate through friction, and the sprayed anticorrosive liquid can be uniformly distributed on the outer wall of the pipeline main body 13.
As shown in fig. 4, the transmission rod 2 and the second gear 23 are in meshing transmission, and the center of the second gear 23 is tightly connected with the second servo motor 24, so that the meshing transmission structure is simple, the transmission is stable, and the tight connection ensures that the second gear 23 does not slip during the rotation process.
The working principle is as follows: when the device is used, the pipeline main body 13 to be subjected to corrosion protection treatment is placed between the clamping blocks 11, the first sliding block 3 is moved in opposite directions, the first sliding block 3 drives the second sliding plate 15 to move in opposite directions, so that the pipeline main body 13 can be fixed, the magnetic strips 19 are separated, the magnetic strips 19 can move back and forth under the action of the elastic force of the elastic sheath 18, so that the elastic sheath 18 contracts, the second sliding block 7 moves downwards, the second sliding block 7 drives the clamping blocks 11 to move downwards through the connecting rods 10 until the clamping blocks 11 convey the pipeline main body 13 into the electroplating pool 12, electroplating solution is poured into the electroplating pool 12 to respectively electrify the anode conductor 9 and the cathode conductor 14, after the pipeline main body 13 is electroplated in the electroplating pool 12, the second sliding block 7 moves upwards, so that the pipeline main body 13 is driven to be separated from the electroplating pool 12, the magnetic strips 19 are moved in opposite directions, so that the elastic sheath 18 is unfolded, the electric push rod 1 (model: L, the electric push rod 1 drives the spraying head 5 to move downwards, a second servo motor 24 (model: 80SW 01330F) is started, the second servo motor 24 drives a second gear 23 to rotate, the second servo motor is matched with the first gear 22 to drive the transmission rod 2 to move downwards, the coating disc 16 moves downwards at the moment, the movable roller 20 is attached to the pipeline main body 13, a first servo motor 21 (model: 80SW 02430F) is started, the first servo motor 21 drives the movable roller 20 to rotate, the spraying head 5 is opened, the spraying head 5 sprays the anticorrosive liquid between the coating disc 16 and the pipeline main body 13, the movable roller 20 can drive the pipeline main body 13 to rotate through friction, the sprayed anticorrosive liquid can be uniformly distributed on the outer wall of the pipeline main body 13, and the redundant anticorrosive liquid can drip on the elastic sheath 18 and cannot enter the electroplating pool 12, and cannot affect next electroplating.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims (8)

1. A water supply equipment pipe network antiseptic treatment process comprises a first sliding plate (4) and is characterized in that an electric push rod (1) is fixed above the first sliding plate (4), the bottom of the electric push rod (1) is movably connected with a spraying head (5), the bottom of the first sliding plate (4) is movably connected with a first sliding block (3), the bottom of the first sliding block (3) is connected with a second sliding plate (15), the first sliding plate (4) penetrates through a transmission rod (2) from top to bottom, a first gear (22) is installed on the right side of the transmission rod (2), a second gear (23) is installed on the left side of the first gear (22) in a matched mode, a second servo motor (24) is connected to the center of the second gear (23), the bottom of the transmission rod (2) is connected with a coating disc (16), and a movable roller (20) is movably connected inside the coating disc (16), the center of the movable roller (20) is connected with a first servo motor (21), the inner side of the second sliding plate (15) is movably connected with a second sliding block (7), the left end of the second sliding block (7) is connected with a connecting rod (10), the second sliding block (7) is connected with a clamping block (11) through the connecting rod (10), the inner side of the clamping block (11) is movably connected with a pipeline main body (13), two sides of the bottom of the first sliding plate (4) are connected with supporting rods (6), the inner sides of the supporting rods (6) are welded with connecting rods (8), the supporting rods (6) are connected with an electroplating pool (12) through the connecting rods (8), the right side of the inner left side of the electroplating pool (12) is provided with an anode conductor (9), the left side of the inner part of the electroplating pool (12) is provided with a cathode conductor (14), and the inner side of the electroplating pool (12), the outside of fixed strip (17) is connected with elastic sheath (18), and fixed strip (17) are connected with magnetic stripe (19) through elastic sheath (18).
2. The anti-corrosion treatment process for the pipe network of the water supply equipment according to claim 1, wherein a lifting structure is formed between the spraying head (5) and the first sliding plate (4) through the electric push rod (1), and the spraying head (5) is rotatably connected with the electric push rod (1).
3. The anticorrosion treatment process for the pipe network of the water supply equipment according to claim 1, wherein the first sliding block (3) is in sliding connection with the first sliding plate (4), and the top of the first sliding block (3) is tightly attached to the bottom of the first sliding plate (4).
4. The anticorrosion treatment process for the pipe network of the water supply equipment according to claim 1, wherein a lifting structure is formed between the smearing disc (16) and the first sliding plate (4) through the transmission rod (2), and the length of the smearing disc (16) is consistent with that of the pipeline main body (13).
5. The water supply equipment pipe network antiseptic treatment process according to claim 1, characterized in that a moving structure is formed between the clamp blocks (11) and the second sliding plate (15) through the connecting rods (10) and the second sliding blocks (7), and two groups of the clamp blocks (11) are symmetrically distributed about the central axis of the first sliding plate (4).
6. The water supply equipment pipe network antiseptic treatment process according to claim 1, characterized in that an elastic structure is formed between the magnetic strips (19) and the fixing strips (17) through elastic sheaths (18), and two groups of the magnetic strips (19) are symmetrically distributed about the central axis of the electroplating tank (12).
7. The anticorrosion treatment process for the pipe network of the water supply equipment according to claim 1, wherein the diameter of the coating disc (16) is larger than that of the pipeline main body (13), and the outer wall of the pipeline main body (13) is tightly attached to the outer wall of the movable roller (20).
8. The anticorrosion treatment process for the pipe network of the water supply equipment according to claim 1, wherein the transmission rod (2) and the second gear (23) are in meshing transmission, and the center of the second gear (23) is tightly connected with the second servo motor (24).
CN202110142277.8A 2021-02-02 2021-02-02 Anticorrosion treatment process for pipe network of water supply equipment Pending CN112921374A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110142277.8A CN112921374A (en) 2021-02-02 2021-02-02 Anticorrosion treatment process for pipe network of water supply equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110142277.8A CN112921374A (en) 2021-02-02 2021-02-02 Anticorrosion treatment process for pipe network of water supply equipment

Publications (1)

Publication Number Publication Date
CN112921374A true CN112921374A (en) 2021-06-08

Family

ID=76169557

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110142277.8A Pending CN112921374A (en) 2021-02-02 2021-02-02 Anticorrosion treatment process for pipe network of water supply equipment

Country Status (1)

Country Link
CN (1) CN112921374A (en)

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Application publication date: 20210608

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