CN112943927A - Pressure vessel opening device and pressure vessel winding method thereof - Google Patents

Pressure vessel opening device and pressure vessel winding method thereof Download PDF

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Publication number
CN112943927A
CN112943927A CN202110348120.0A CN202110348120A CN112943927A CN 112943927 A CN112943927 A CN 112943927A CN 202110348120 A CN202110348120 A CN 202110348120A CN 112943927 A CN112943927 A CN 112943927A
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CN
China
Prior art keywords
pressure vessel
opening device
layer
bottom layer
insert
Prior art date
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Pending
Application number
CN202110348120.0A
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Chinese (zh)
Inventor
陈小功
范雷
刘同�
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Canature Health Technology Group Co ltd
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Canature Health Technology 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.)
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Publication date
Application filed by Canature Health Technology Group Co ltd filed Critical Canature Health Technology Group Co ltd
Priority to CN202110348120.0A priority Critical patent/CN112943927A/en
Publication of CN112943927A publication Critical patent/CN112943927A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J13/00—Covers or similar closure members for pressure vessels in general
    • F16J13/02—Detachable closure members; Means for tightening closures
    • 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
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
    • 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
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
    • B29C70/38—Automated lay-up, e.g. using robots, laying filaments according to predetermined patterns
    • B29C70/382—Automated fiber placement [AFP]
    • 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
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J12/00—Pressure vessels in general
    • 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
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7154—Barrels, drums, tuns, vats
    • B29L2031/7156—Pressure vessels

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Robotics (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Pressure Vessels And Lids Thereof (AREA)

Abstract

The invention discloses a pressure vessel opening device and a pressure vessel winding method thereof. The pressure vessel winding method comprises the following steps: s1, winding bottom layer yarns on the outer surface of the inner container layer; s2, taking out the conical part; s3, winding surface layer yarns on the outer surfaces of the bottom layer yarns and the embedded part; and S4, perforating the positions corresponding to the embedded parts in the surface layer yarns. The pressure bearing capacity at the opening is effectively enhanced, so that the integral structure of the opening device of the pressure container is more reliable and safer; meanwhile, the production process is continuous, the post-processing is simple and convenient, the production efficiency of the pressure container opening device is greatly improved, and the safety of the pressure container opening device is also improved.

Description

Pressure vessel opening device and pressure vessel winding method thereof
Technical Field
The invention relates to the field of water treatment, in particular to a pressure container opening device and a pressure container winding method thereof.
Background
The filter material tank (commonly called a glass fiber reinforced plastic barrel) for producing and manufacturing the composite material with enhanced pressure is widely applied to the field of water treatment, particularly a large-scale water treatment system as the filter material tank because the inner container is formed seamlessly, the bearing capacity is strong, and the filter material tank is environment-friendly and sanitary. In recent years, with economic development, the form of such containers has begun to vary widely: in addition to the traditional upper and lower opening types, there are also shoulder openings, bowl side openings (which may be 1 or more, and may be co-directional or counter-directional), and the like. Because of these changes, water treatment processes have been developed and sensors have been used to meet the water treatment requirements of different types.
At present in the filter material jar, the continuous uninterruptedly winding of combined material enhancement layer yarn is at the surface on inner bag layer, because the combined material enhancement layer on the container need be worn to the trompil operation, the back will be cut off to the winding yarn for intensity can receive the influence greatly, and then when the filter material jar bears higher pressure, the opening part easily produces the seepage because intensity is not enough, bursts the defect even, makes the product can not use, still can lead to user's loss of property when serious.
Disclosure of Invention
The invention aims to solve the technical problems that strength is greatly influenced due to the fact that a composite material reinforcing layer on a container needs to be punched in the existing hole opening operation, products cannot be used due to the fact that the opening is prone to leakage and even bursting due to insufficient strength, and property loss of users is caused in serious situations, and provides a pressure container opening device and a pressure container winding method thereof.
The invention solves the technical problems through the following technical scheme:
the utility model provides a pressure vessel opening device, its characterized in that, it includes inner bag layer, adaptor and inserts, the adaptor connect in the inner bag layer, the inserts includes embedding part and circular cone portion, embedding part detachably connect in the adaptor, circular cone portion detachably connect in the embedding part, just circular cone portion protrusion in the surface on inner bag layer.
In this scheme, adopt above-mentioned structural style, can be with bottom yarn to both sides landing in order to avoid finally punching through circular cone portion for the bottom yarn can not be cut off by follow-up processing, has effectively strengthened the bearing capacity at the opening part, thereby realizes that pressure vessel opening device overall structure is safe more reliably. Meanwhile, the post-processing procedures are few, cloth laying operation is not needed, the production process is continuous, post-processing is simple and convenient, the production efficiency of the pressure container opening device is greatly improved, and the safety of the pressure container opening device is also improved.
Preferably, the bottom of the conical part is provided with an insertion block, one end of the insertion part facing the conical part is provided with an insertion groove, and the insertion block is embedded in the insertion groove.
In the scheme, the structure is adopted, so that the installation and the disassembly are very convenient; meanwhile, the insertion block and the slot have a positioning effect, the conical part is accurately installed, the fact that the bottom layer yarns cannot be cut off in the subsequent hole opening process is guaranteed, the insertion block and the slot are simple in structure, and the processing and manufacturing are convenient.
Preferably, the adaptor has a through hole, and the embedding portion is embedded in the through hole.
In the scheme, the structure is adopted, so that the installation and the disassembly are very convenient; meanwhile, the through hole and the embedded part have a positioning effect, so that the adapter is high in installation accuracy, and subsequent opening operation that bottom yarns are cut off and accurately follow-up opening operation cannot be guaranteed.
Preferably, one end of the through hole facing the insert is provided with a step, the outer peripheral surface of the insert part is provided with an abutting part extending outwards, and the abutting part is embedded in the step.
In the scheme, the structure is adopted, so that the embedded part is prevented from being offset and dislocated in the using process, and the opening device of the pressure container is higher in stability; and the mounting and positioning precision is higher.
Preferably, the inner container layer is provided with a mounting frame which is sunken along the inner direction of the inner container layer, and the adaptor is connected to the inside of the mounting frame from outside to inside.
In this scheme, adopt above-mentioned structural style, the adaptor is installed on the mounting bracket from the outside on inner bag layer to the installation of realization to the adaptor need not to carry out installation operation from the inside on inner bag layer, makes the installation of adaptor simple and convenient, high efficiency.
Preferably, the pressure vessel opening device further comprises a sealing ring, and the sealing ring is arranged between the mounting frame and the adapter in a pressing mode.
In this scheme, adopt above-mentioned structural style, effectively strengthened pressure vessel opening device's sealed effect through the sealing washer, be favorable to improving the seal of pressure vessel in the use.
A pressure vessel winding method characterized by using the pressure vessel opening device as described above, comprising the steps of:
s1, winding bottom layer yarns on the outer surface of the inner container layer, wherein when the wound bottom layer yarns cover the conical part, the bottom layer yarns slide to two sides of the conical part to avoid the conical part;
s2, taking out the conical part;
s3, winding surface layer yarns on the outer surfaces of the bottom layer yarns and the embedded part;
and S4, perforating the positions of the surface layer yarns corresponding to the embedded parts.
In this scheme, the bottom layer yarn can not be processed to make the bottom layer yarn be continuous and have higher intensity. The pressure bearing capacity at the opening is effectively enhanced, so that the integral structure of the opening device of the pressure container is more reliable and safer. The post-processing procedures are few, cloth laying operation is not needed, the production process is continuous, post-processing is simple and convenient, the production efficiency of the pressure container opening device is greatly improved, and the safety of the pressure container opening device is also improved. Meanwhile, the bottom layer yarn does not need to be punched, so that punching operation is very convenient.
Preferably, in step S1, the bottom layer yarn is spirally wound on the outer surface of the inner container layer.
In the scheme, the pressure bearing capacity of the inner container layer is enhanced.
Preferably, in step S3, the surface layer yarn is hoop-wound around the outer surface of the bottom layer yarn.
In this scheme, for the surface of hoop winding inner bag layer through top layer yarn to strengthen weak link. The part with weaker pressure-bearing capacity on the inner container layer is reinforced, so that the preset pressure-bearing requirement is met, and the safety of the opening device of the pressure container is improved.
Preferably, step S5 is further included after step S4, and step S5 is to take out the embedded portion.
On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.
The positive progress effects of the invention are as follows:
according to the pressure container opening device and the pressure container winding method thereof, the bottom layer yarns slide to two sides through the conical parts to avoid final punching, so that the bottom layer yarns cannot be cut off by processing, the pressure bearing capacity at the opening is effectively enhanced, and the integral structure of the pressure container opening device is more reliable and safer; meanwhile, the production process is continuous, the post-processing is simple and convenient, the production efficiency of the pressure container opening device is greatly improved, and the safety of the pressure container opening device is also improved.
Drawings
Fig. 1 is a schematic view showing the internal structure of a pressure vessel opening device according to an embodiment of the present invention when bottom layer yarns are wound.
Fig. 2 is a schematic view of the pressure vessel opening device of the embodiment of the present invention when the bottom layer yarn is wound.
Fig. 3 is another schematic view of the pressure vessel opening device of the embodiment of the present invention when the bottom layer yarn is wound.
Fig. 4 is a schematic view of the pressure vessel opening device of the embodiment of the present invention when the conical portion is taken out.
Fig. 5 is a schematic view of the pressure vessel opening device of the embodiment of the present invention when the surface layer yarn is wound.
Description of reference numerals:
inner container layer 1
Mounting frame 11
Adapter 2
Through hole 21
Step 22
Insert 3
Conical section 31
Plug block 311
Insert part 32
Slot 321
Sealing ring 4
Bottom layer yarn 10
Face yarn 20
Detailed Description
The present invention will be more clearly and completely described below by way of examples and with reference to the accompanying drawings, but the present invention is not limited thereto.
As shown in fig. 1 to 5, the present application provides a pressure vessel opening device, which includes a liner layer 1, an adaptor 2 and an insert 3, wherein the adaptor 2 is connected to the liner layer 1, the insert 3 includes an insertion portion 32 and a conical portion 31, the insertion portion 32 is detachably connected to the adaptor 2, the conical portion 31 is detachably connected to the insertion portion 32, and the conical portion 31 protrudes out of the outer surface of the liner layer 1.
Have the opening on the inner bag layer 1, adaptor 2 installation sets up at the opening part and is connected with inner bag layer 1, realizes being connected with the outside through adaptor 2. The insert 3 is detachably connected to the adaptor 2 by an insert portion 32, and the insert portion 32 and the conical portion 31 can be separated from each other. The combined material enhancement layer is including bottom yarn 10 and top layer yarn 20, bottom yarn 10 and top layer yarn 20 all need twine respectively at the surface of inner bag layer 1, because cone portion 31 protrusion in inner bag layer 1's surface, when bottom yarn 10 twines, can be with bottom yarn 10 to both sides landing in order to avoid finally punching through cone portion 31, make bottom yarn 10 can not be cut off by subsequent processing, effectively strengthened the bearing capacity at the opening part, thereby realize pressure vessel opening device overall structure safety more reliably. Meanwhile, the post-processing procedures are few, cloth laying operation is not needed, the production process is continuous, post-processing is simple and convenient, the production efficiency of the pressure container opening device is greatly improved, and the safety of the pressure container opening device is also improved.
The bottom of the conical portion 31 has an insertion block 311, one end of the fitting portion 32 facing the conical portion 31 has a slot 321, and the insertion block 311 is fitted in the slot 321. The insertion block 311 is inserted into the insertion slot 321 to realize mutual matching, and the installation and the disassembly are very convenient; meanwhile, the insertion block 311 and the slot 321 have a positioning function, so that the conical part 31 is accurately installed, the bottom layer yarn 10 cannot be cut off in the subsequent hole opening process, and the insertion block 311 and the slot 321 are simple in structure and convenient to process and manufacture.
The adaptor 2 has a through hole 21, and the insertion portion 32 is inserted into the through hole 21. The embedded part 32 is inserted into the through hole 21 to realize the mutual matching of the insert 3 and the adapter 2, and the assembly and the disassembly are very convenient; meanwhile, the through hole 21 and the embedding part 32 have a positioning function, so that the adaptor 2 is installed accurately, and subsequent hole opening operation and processing and cutting-off of the bottom layer yarn 10 are avoided. The insertion portion 32 has a cylindrical shape.
The through hole 21 has a step 22 at an end facing the insert 3, and the outer peripheral surface of the insert portion 32 has an outwardly extending abutting portion which is fitted in the step 22. The embedded part 32 is abutted against the step 22 through the abutting part, so that the embedded part 32 avoids the occurrence of offset and dislocation in the use process, and the opening device of the pressure container has higher stability; and the mounting and positioning precision is higher.
The inner container layer 1 is provided with an installation frame 11 which is sunken along the inner direction thereof, and the adaptor 2 is connected in the installation frame 11 from outside to inside. When the adapter 2 is installed, the adapter 2 is installed on the installation frame 11 from the outside of the inner container layer 1, so that the adapter 2 is installed without installation operation from the inside of the inner container layer 1, and the installation process of the adapter 2 is simple, convenient, rapid and efficient.
The opening device of the pressure container further comprises a sealing ring 4, and the sealing ring 4 is arranged between the mounting frame 11 and the adapter 2 in a pressing mode. The sealing effect of the opening device of the pressure container is effectively enhanced through the sealing ring 4, and the sealing performance of the pressure container in the using process is improved. Wherein, set up sealing washer 4 in mounting bracket 11 and lie in between mounting bracket 11 and adaptor 2, mounting bracket 11 plays good spacing fixed action to sealing washer 4. The sealing ring 4 is annular, has a circular cross section and is made of rubber.
The embodiment also discloses a pressure vessel winding method, which utilizes the pressure vessel opening device, and the pressure vessel winding method comprises the following steps: step S1, winding the bottom layer yarn 10 on the outer surface of the inner container layer 1, wherein when the wound bottom layer yarn 10 covers the conical part 31, the bottom layer yarn 10 slides to two sides of the conical part 31 to avoid; step S2, taking out the conical part 31; step S3, winding the surface layer yarn 20 on the outer surfaces of the bottom layer yarn 10 and the embedded part 32; in step S4, holes are punched in the surface-layer yarn 20 at positions corresponding to the embedded portions 32.
Through the above steps, when the bottom layer yarn 10 is wound and covered on the conical portion 31, the bottom layer yarn 10 slides down to both sides of the conical portion 31, thereby avoiding the position where the opening is needed. This has the advantage that the bottom layer yarns 10 are not processed during the final perforation, so that the bottom layer yarns 10 are continuous and have a high strength. The pressure bearing capacity at the opening is effectively enhanced, so that the integral structure of the opening device of the pressure container is more reliable and safer. Meanwhile, the post-processing procedures are few, cloth laying operation is not needed, the production process is continuous, post-processing is simple and convenient, the production efficiency of the pressure container opening device is greatly improved, and the safety of the pressure container opening device is also improved.
After the bottom layer yarns 10 are wound, it is still necessary to continue to wind the surface layer yarns 20 of the composite reinforcement layer. If only the bottom layer yarns 10 and not the surface layer yarns 20 are provided, the pressure vessel opening device still has weak spots and is difficult to continuously bear high pressure. After the bottom layer yarn 10 is wound, the conical part 31 is taken out, the embedded part 32 is reserved, and the embedded part 32 is not exposed out of the outer surface of the inner container layer 1, so that the outer surface of the inner container layer 1 is completely covered by the winding of the surface layer yarn 20 to strengthen weak links, and the pressure bearing capacity of the pressure container opening device is improved.
After the surface layer yarn 20 is wound, the surface layer yarn 20 may be punched after being cured. The perforating operation is very convenient because perforating the bottom layer yarn 10 is not required.
Step S5 is also included after step S4, and step S5 is to take out the embedded part 32. After the punching is completed, the embedded part 32 of the insert 3 can be taken out through the hole, thereby realizing the completion of the finished product processing process. The post-processing procedures are few, cloth laying operation is not needed, the production process is continuous, post-processing is simple and convenient, and the production efficiency of the opening device of the pressure container is greatly improved; meanwhile, the safety of the opening device of the pressure container is improved.
In step S1, the bottom yarn 10 is spirally wound around the outer surface of the inner layer 1. In step S3, the surface layer yarn 20 is hoop-wound around the outer surface of the bottom layer yarn 10. The bottom layer yarn 10 is covered by spirally winding, and if only the bottom layer yarn 10 is spirally wound, the straight section part of the inner container layer 1 still has a weak place and is difficult to continuously bear high pressure. The surface layer yarn 20 is wound on the outer surface of the inner container layer 1 in the circumferential direction to reinforce the weak link. The part with weaker pressure-bearing capacity on the inner container layer 1 is strengthened to meet the preset pressure-bearing requirement, and the safety of the opening device of the pressure container is improved.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.

Claims (10)

1. The utility model provides a pressure vessel opening device, its characterized in that, it includes inner bag layer, adaptor and inserts, the adaptor connect in the inner bag layer, the inserts includes embedding part and circular cone portion, embedding part detachably connect in the adaptor, circular cone portion detachably connect in the embedding part, just circular cone portion protrusion in the surface on inner bag layer.
2. The pressure vessel opening device of claim 1, wherein the bottom of the conical portion has an insert, and an end of the insertion portion facing the conical portion has a slot, and the insert is inserted into the slot.
3. The pressure vessel opening device of claim 1, wherein the adaptor has a through hole, and the insert portion is fitted in the through hole.
4. The pressure vessel opening device according to claim 3, wherein an end of the through-hole toward the insert has a step, and an outer peripheral surface of the insert portion has an outwardly extending abutting portion that is embedded in the step.
5. A pressure vessel opening device as claimed in claim 1, wherein the inner container layer has a mounting frame recessed in an inner direction thereof, and the adapter is connected to the mounting frame from outside to inside.
6. The pressure vessel opening device of claim 5, further comprising a sealing ring compressed between the mounting bracket and the adapter.
7. A pressure vessel winding method using the pressure vessel opening device according to any one of claims 1 to 6, the pressure vessel winding method comprising the steps of:
s1, winding bottom layer yarns on the outer surface of the inner container layer, wherein when the wound bottom layer yarns cover the conical part, the bottom layer yarns slide to two sides of the conical part to avoid the conical part;
s2, taking out the conical part;
s3, winding surface layer yarns on the outer surfaces of the bottom layer yarns and the embedded part;
and S4, perforating the positions of the surface layer yarns corresponding to the embedded parts.
8. The pressure vessel winding method as claimed in claim 7, wherein in step S1, the bottom layer yarn is spirally wound around the outer surface of the inner container layer.
9. The pressure vessel winding method as claimed in claim 7, wherein in the step S3, the surface layer yarn is hoop-wound around the outer surface of the bottom layer yarn.
10. The pressure vessel winding method as claimed in claim 7, further comprising a step S5 after the step S4, wherein the step S5 is to take out the insert part.
CN202110348120.0A 2021-03-31 2021-03-31 Pressure vessel opening device and pressure vessel winding method thereof Pending CN112943927A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110348120.0A CN112943927A (en) 2021-03-31 2021-03-31 Pressure vessel opening device and pressure vessel winding method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110348120.0A CN112943927A (en) 2021-03-31 2021-03-31 Pressure vessel opening device and pressure vessel winding method thereof

Publications (1)

Publication Number Publication Date
CN112943927A true CN112943927A (en) 2021-06-11

Family

ID=76231449

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110348120.0A Pending CN112943927A (en) 2021-03-31 2021-03-31 Pressure vessel opening device and pressure vessel winding method thereof

Country Status (1)

Country Link
CN (1) CN112943927A (en)

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