CN115213692A - Personalized composite base station, tool for machining and machining method - Google Patents
Personalized composite base station, tool for machining and machining method Download PDFInfo
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- CN115213692A CN115213692A CN202210920483.1A CN202210920483A CN115213692A CN 115213692 A CN115213692 A CN 115213692A CN 202210920483 A CN202210920483 A CN 202210920483A CN 115213692 A CN115213692 A CN 115213692A
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- 239000002131 composite material Substances 0.000 title claims abstract description 45
- 238000003754 machining Methods 0.000 title claims description 30
- 238000000034 method Methods 0.000 title claims description 13
- 238000004519 manufacturing process Methods 0.000 claims abstract description 25
- 238000012545 processing Methods 0.000 claims abstract description 22
- 238000000227 grinding Methods 0.000 claims description 13
- 150000001875 compounds Chemical class 0.000 claims description 9
- 238000005520 cutting process Methods 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 7
- 238000005498 polishing Methods 0.000 claims description 5
- 238000013507 mapping Methods 0.000 claims description 3
- 238000002513 implantation Methods 0.000 abstract description 5
- 238000003672 processing method Methods 0.000 abstract description 5
- 230000007547 defect Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 238000003801 milling Methods 0.000 description 4
- 239000007943 implant Substances 0.000 description 3
- 210000000214 mouth Anatomy 0.000 description 3
- 210000000988 bone and bone Anatomy 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000010923 batch production Methods 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P23/00—Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass
- B23P23/02—Machine tools for performing different machining operations
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C8/00—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools
- A61C8/0018—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools characterised by the shape
- A61C8/0037—Details of the shape
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C8/00—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools
- A61C8/0048—Connecting the upper structure to the implant, e.g. bridging bars
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- Health & Medical Sciences (AREA)
- Epidemiology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mechanical Engineering (AREA)
- Veterinary Medicine (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Orthopedic Medicine & Surgery (AREA)
- Engineering & Computer Science (AREA)
- Public Health (AREA)
- Dentistry (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Dental Prosthetics (AREA)
- Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
Abstract
The invention provides a personalized composite abutment, a tool for processing and a processing method, which belong to the field of dental implantation. The invention improves the manufacturing precision of the personalized composite abutment, deeply improves the product quality, reduces the clinical use risk, reduces the manual drawing cost and improves the manufacturing efficiency.
Description
Technical Field
The invention belongs to the field of dental implantation, and relates to a personalized composite abutment, a tool for processing and a processing method.
Background
The personalized composite abutment is used for personalized aesthetic restoration of dental implantation, and is combined with installation of an upper bridge, so that the personalized composite abutment belongs to a high-end restoration mode in the industry at present, with the trend of clinical patients or doctors for personalized aesthetic restoration, the personalized composite abutment can solve the problem of complicated medical history of oral cavities of patients, and more people are willing to select or accept the restoration mode.
The personalized composite abutment is manufactured in a traditional mode, the designed data form is an STL file format, the STL file format belongs to a file printed in 3D, the file cannot be directly typeset and programmed by dental customized typesetting software and industrial programming software at present, the STL file is edited and modified by adopting industrial software in the present industry, curves in the STL file are extracted in a manual mode and then spliced into a curved surface, manual splicing consumes time and labor cost, and almost occupies the workload of drawing by one person.
The method is characterized in that the digital implantation is extended to final restoration, after a patient implantation operation is finished, a scanning rod is installed to establish data, a composite base station, a bridge frame are designed, typesetting, processing and cutting are carried out, and finally false teeth are manufactured, installed and worn.
And individualized compound base station whole part is made through milling processing mode, and the interface position is very high to the precision requirement, and the precision that generally need make through the car processing mode is more accurate, and traditional whole milling processing mode has certain defect, and the interface part can not be accurate handle the accuse and probably suffer from in some bad back in the clinic, has certain risk to the handle accuse of compound base station quality.
Disclosure of Invention
The invention aims to solve the problems and provides a personalized composite base station, a tool for processing and a processing method, wherein an interface conical surface, an outer hexagon and a screw channel are processed and manufactured through automatic numerical control turning and milling composite equipment of a turning center, designed personalized composite base station data are led into millbox typesetting software to generate a cutter path and are installed on the tool of a five-axis processing center, and the personalized composite base station is processed by cutting, so that the manufacturing precision of the personalized composite base station is improved, the product quality is improved deeply, the clinical use risk is reduced, the manual drawing cost is reduced, and the manufacturing efficiency is improved.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the personalized composite base station is manufactured by firstly manufacturing a preformed base station, processing an interface conical surface, an outer six aspects and a screw channel through numerical control processing equipment, importing the designed data of the personalized composite base station into typesetting software to generate a cutter path, and installing the cutter path on a tool of a numerical control processing center to cut and process the personalized composite base station.
Furthermore, the interface conical surface and the outer hexagonal surface are sequentially and coaxially arranged at one end of the preformed base station, the other end of the preformed base station is a cylinder, machining auxiliary surfaces are arranged on two sides of the cylinder, and a fixing rod extending outwards is vertically arranged on each auxiliary machining surface.
The tooling for processing the personalized composite base station comprises a fixed column and a fixed plate, wherein the fixed plate is horizontally arranged, one end of the fixed plate, which is far away from the fixed column, is provided with a U-shaped opening, fixing grooves are formed in the middle parts of two sides of the U-shaped opening, the fixing grooves are U-shaped grooves with outward openings, each fixing groove is provided with a positioning hole which penetrates through the fixing groove from top to bottom, the upper end of each positioning hole is a light hole, the lower end of each positioning hole is a screw hole, and the fixed rod is positioned by a screw which extends into the positioning hole after extending into the fixing groove;
and one end of the fixing column, which is far away from the fixing plate, is provided with a plurality of screw holes and a plurality of pin holes for connecting a five-axis machining center.
Furthermore, the plurality of screw holes are uniformly distributed on the circumference of the axis of the fixing column, the plurality of pin holes are uniformly distributed on the circumference of the axis of the fixing column, and the diameter of the positioning circle where the plurality of pin holes are located is larger than that of the positioning circle where the plurality of screw holes are located.
The processing method of the personalized composite abutment comprises the following steps,
s1, manufacturing preformed base stations according to interface data of different brands and models;
s2, designing an individual composite abutment according to the oral condition of a patient;
s3, mapping and manufacturing the interface data of the composite base station according to original factory data of each brand, verifying matching adjustment parameters of the original factory data, and programming software to set a protection area;
s4, mounting a preformed base station on a machining tool, and machining by adopting an industrial five-axis machining center;
and S5, grinding and polishing.
Furthermore, the position of the interface part is firstly processed by utilizing turning equipment, the interface part comprises an interface conical surface and an outer six side, and a screw channel in the middle of the preformed base station is processed by the turning equipment.
Further, in the step 2, the EXOCAD design software is adopted, in the step 3, the maximum allowance of the step of the interface connection position needs to be reserved for 0.02mm, and the typesetting software is millbox typesetting software.
Furthermore, the precision of the tool clamp is within 0.01mm, cutting parameters are set according to the requirements of a drawing, and the finish machining multiplying power is set to be F1000.
Furthermore, the hand-held grinding machine is used for grinding, and the interface conical surface is not touched in the grinding process.
Compared with the prior art, the invention has the following advantages and positive effects.
1. The invention firstly makes a preformed base station, the automatic numerical control turning and milling compound equipment passes through a turning center to process and manufacture an interface conical surface, an outer hexagon and a screw channel, the designed data of the personalized compound base station is led into millbox typesetting software to generate a cutter path, the tool is installed on a machining tool of a five-axis machining center, the personalized compound base station is machined, the interface part of the compound base station is protected in the typesetting software, and the rest positions are machined in the five-axis machining, so that the design, the typesetting programming and the cutting processing are quickly realized, the method is suitable for batch production and manufacturing schemes, the processing and manufacturing mode of the personalized compound base station is quickly realized, the manufacturing precision of the personalized compound base station is improved, the product quality is deeply improved, the clinical use risk is reduced, the manual drawing cost is reduced, the manufacturing efficiency is improved, and the method is a brand new technological innovation;
2. in the base station of performing in this application, the interface conical surface is processed earlier and is accomplished, as the precision reference point of follow-up processing step, guarantee the accuracy standard, and then the biggest surplus of interface linking position step need reserve 0.02mm, the frock clamp precision is within 0.01mm, cutting parameter is set for according to the drawing requirement, the fine machining multiplying power is set for F1000, the setting of above parameter, on the basis of guaranteeing positioning accuracy, the precision in the course of working has further been guaranteed, the holistic high accuracy of product has been realized.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic bottom view of a preform abutment according to the present invention;
FIG. 2 is a schematic top view of the preform abutment of the present invention;
FIG. 3 is a schematic structural view of the tooling of the present invention;
fig. 4 is a schematic view of the fitting structure of the machining tool and the preform base according to the present invention.
Reference numerals are as follows:
1. pre-forming a base platform; 11. an interface conical surface; 12. the external six aspects; 13. fixing the rod; 15. a screw channel; 2. a tool for processing; 21. fixing a column; 211. a screw hole; 212. a pin hole; 22. a fixing plate; 221. a U-shaped opening; 222. fixing grooves; 223. and (7) positioning the holes.
Detailed Description
It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings, which are based on the orientations and positional relationships indicated in the drawings, and are used for convenience in describing the present invention and for simplicity in description, but do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated, 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 relative importance or to implicitly indicate a number of the indicated technical features. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The following detailed description of specific embodiments of the invention refers to the accompanying drawings.
As shown in fig. 1-4, the personalized composite abutment of the present invention is a personalized composite abutment, which is prepared by first preparing a preformed abutment 1, processing the interface conical surface 11, the outer six surfaces 12 and the screw channel 15 by using a numerical control processing device, importing the designed personalized composite abutment data into a typesetting software to generate a tool path, and installing the tool path on a tool of a numerical control processing center to machine the personalized composite abutment.
Preferably, the interface conical surface 11 and the outer hexagonal surface 12 are coaxially arranged at one end of the preforming base 1 in sequence, the other end is a cylinder, machining auxiliary surfaces are arranged at two sides of the cylinder, and a fixing rod 13 extending outwards is vertically arranged on each auxiliary machining surface.
The tooling 2 for processing the personalized composite base station comprises a fixing column 21 and a fixing plate 22, wherein the fixing plate 22 is horizontally arranged, one end, far away from the fixing column 21, of the fixing plate 22 is provided with a U-shaped opening 221, fixing grooves 222 are formed in the middles of two sides of the U-shaped opening 221, the fixing grooves 222 are U-shaped grooves with outward openings, each fixing groove 222 is provided with a positioning hole 223 penetrating through the fixing groove in the vertical direction, the upper end of each positioning hole 223 is a light hole, the lower end of each positioning hole 223 is a screw hole 211, and the fixing rod 13 is positioned by a screw extending into the positioning hole 223 after extending into the fixing groove 222; one end of the fixing column 21, which is far away from the fixing plate 22, is provided with a plurality of screw holes 211 and a plurality of pin holes 212 for connecting a five-axis machining center.
Preferably, the screw holes 211 are circumferentially and uniformly distributed relative to the axis of the fixing column 21, the pin holes 212 are circumferentially and uniformly distributed relative to the axis of the fixing column 21, the diameter of the positioning circle where the screw holes 212 are located is larger than that of the positioning circle where the screw holes 211 are located, the screws are used for connection and fixation, and the screw holes 212 are used for positioning and ensuring accuracy.
The processing method of the personalized composite abutment comprises the following steps,
s1, manufacturing a preformed base station 1 according to interface data of different brands and models, wherein except for an interface conical surface 11 and six aspects 12 of the preformed base station, a screw channel 15 in the middle of the preformed base station 1 and the rest parts are of blank structures and do not need to be processed;
s2, designing the personalized composite abutment according to the oral cavity condition of the patient, wherein the design process is a personalized design part, and the design is carried out according to different conditions of each patient and is other parts except the processing surface of the preformed abutment 1 in the step S1;
s3, mapping and manufacturing the interface data of the composite abutment according to original factory data of each brand, matching the interface data with implant teeth of each brand, verifying matching adjustment parameters of the original factory data, and setting a protection area by programming software;
the abutment is usually for the form of maintaining the gum, can also connect the crown, and the condition that implanted tooth can be effectual improvement tooth disappearance usually needs to be punched on alveolar bone drill location, then implants in the alveolar bone, can form osseous bonding, needs to use the abutment to replace the screw cap after resumeing, then lets the abutment expose in the oral cavity, uses the crown to repair, improves the condition that the tooth is lost, resumes normal masticatory function.
S4, mounting the preformed base station 1 to the machining tool 2, wherein the concept of the preformed base station 1 is the solution provided by process improvement, the machining tool 2 is arranged in a targeted manner, no existing tool can refer to the existing tool, and an industrial five-axis machining center is adopted for machining;
s5, grinding and polishing, wherein the pre-formed base 1 is processed and formed except for the area matched with the pre-fixing rod 13, after the processing is finished, the fixing rod 13 is removed, manual grinding and polishing are carried out, and the roughness after polishing reaches more than 0.8.
Preferably, the interface part is machined by utilizing turning equipment, the interface part comprises an interface conical surface 11 and an outer six-side 12, the screw channel 15 in the middle of the preformed base table 1 is machined by the turning equipment, and the machined screw channel can be used as a reference for subsequent machining, so that the precision of the machining reference is ensured, and the precision of the overall machining is further improved.
Preferably, in step 2, the EXOCAD design software is adopted, which is software commonly used in the industry, or other similar software can be substituted, as long as the form design of the base station can be realized, in step 3, the maximum margin of the step of the interface engagement position needs to be reserved for 0.02mm, the precision is ensured, and the typesetting software is millbox typesetting software, which is common software.
Preferably, the precision of the tool clamp is within 0.01mm, the cutting parameters are set according to the drawing requirements, the finish machining multiplying power is set to be F1000, and the precision in the machining process is further ensured on the basis of ensuring the positioning precision through the setting of the parameters.
Preferably, the handheld grinding machine is used for grinding, the interface conical surface 11 is not touched in the grinding process, and the precision of the interface conical surface 11 is guaranteed.
Example (b):
see the following list for specific operating steps;
most manufacturers in the existing scheme market adopt the method, most manufacturers can feel the defects of the traditional manufacturing process (interface matching precision defect) according to some collected information feedback, and most manufacturers feel the defects of the traditional manufacturing process, but a better solution mode is not provided, and only the clinical application of the manufacturing process can be carried out at first.
The novel process is adopted to solve the problem of machining precision of the interface position of the personalized composite base station, the personalized composite base station can be effectively and accurately combined with a pre-implant, the risk of product quality problems in clinical application is reduced, the problem of time and labor consumption of manually extracting the contour link curved surface from the STL file is solved, the personalized composite base station can be quickly installed on a special tool, typesetting programming and cutting machining can be achieved, the labor cost is saved, and the product manufacturing efficiency is improved.
Although one embodiment of the present invention has been described in detail, the description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (9)
1. Individualized compound base station, its characterized in that: firstly, a preformed base station is manufactured, the interface conical surface, the outer six aspects and the screw channel are processed and manufactured through numerical control processing equipment, the designed personalized composite base station data are led into typesetting software to generate a cutter path, and the personalized composite base station is installed on a tool of a numerical control processing center to be cut and processed.
2. The personalized composite abutment of claim 1, wherein: the connector conical surface and the outer hexagonal surface are sequentially and coaxially arranged at one end of the preformed base station, the other end of the preformed base station is a cylinder, machining auxiliary surfaces are arranged on two sides of the cylinder, and a fixing rod extending outwards is perpendicularly arranged on each auxiliary machining surface.
3. The tooling for processing the personalized composite abutment according to claim 2, wherein: the fixing device comprises a fixing column and a fixing plate, wherein the fixing plate is horizontally arranged, one end of the fixing plate, which is far away from the fixing column, is provided with a U-shaped opening, fixing grooves are arranged in the middle parts of two sides of the U-shaped opening, the fixing grooves are U-shaped grooves with outward openings, each fixing groove is provided with a positioning hole which penetrates through the fixing groove from top to bottom, the upper end of each positioning hole is a light hole, the lower end of each positioning hole is a screw hole, and the fixing rod is positioned by a screw which extends into the positioning hole after extending into the fixing groove;
and one end of the fixing column, which is far away from the fixing plate, is provided with a plurality of screw holes and a plurality of pin holes for connecting a five-axis machining center.
4. The tooling for processing the personalized composite abutment according to claim 3, wherein: the plurality of screw holes are uniformly distributed on the circumference of the axis of the fixing column, the plurality of pin holes are uniformly distributed on the circumference of the axis of the fixing column, and the diameter of a positioning circle where the plurality of pin holes are located is larger than that of a positioning circle where the plurality of screw holes are located.
5. The method of fabricating a personalized composite abutment according to claim 1 or 2, wherein: comprises the following steps of (a) carrying out,
s1, manufacturing preformed base stations according to interface data of different brands and models;
s2, designing an individual composite abutment according to the oral condition of a patient;
s3, mapping and manufacturing interface data of the composite base station according to original factory data of each brand, verifying matching and adjusting parameters of the original factory data, and programming software to set a protection area;
s4, mounting a preformed base station on a machining tool, and machining by adopting an industrial five-axis machining center;
and S5, grinding and polishing.
6. The method of manufacturing a personalized composite abutment according to claim 5, wherein: the position of the interface part is firstly processed by utilizing turning equipment, the interface part comprises an interface conical surface and an outer six aspect, and a screw channel in the middle of the preformed base station is processed by the turning equipment.
7. The method of manufacturing a personalized composite abutment according to claim 5, wherein: in the step 2, the EXOCAD design software is adopted, in the step 3, the maximum allowance of the interface connection position step needs to be reserved for 0.02mm, and the typesetting software is Milllbox typesetting software.
8. The method of manufacturing a personalized composite abutment according to claim 5, wherein: the precision of the tool clamp is within 0.01mm, the cutting parameters are set according to the drawing requirements, and the finish machining multiplying power is set to be F1000.
9. The method of manufacturing a personalized composite abutment according to claim 5, wherein: the handheld grinding machine is used for grinding, and the interface conical surface is not touched in the grinding process.
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| CN202210920483.1A CN115213692B (en) | 2022-08-02 | 2022-08-02 | Personalized composite base station, tooling for machining and machining method |
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| CN202210920483.1A CN115213692B (en) | 2022-08-02 | 2022-08-02 | Personalized composite base station, tooling for machining and machining method |
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| CN115213692A true CN115213692A (en) | 2022-10-21 |
| CN115213692B CN115213692B (en) | 2024-03-29 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140343706A1 (en) * | 2013-05-14 | 2014-11-20 | Timothy O. Hart | Customizable Healing Abutment |
| KR101488258B1 (en) * | 2014-09-17 | 2015-01-30 | 태림메디텍 주식회사 | Jig for Abutment Manufacturing and Processing Method Therewith |
| KR101536643B1 (en) * | 2014-04-16 | 2015-07-14 | 이명석 | Fixing jig for implant abutment with locking means |
| KR101813877B1 (en) * | 2016-11-10 | 2018-01-30 | (주)명문덴탈 | Double coupling zig with guide |
| KR101858624B1 (en) * | 2017-01-23 | 2018-05-17 | 주식회사 덴티움 | Abutment blank |
| KR20200084676A (en) * | 2019-01-03 | 2020-07-13 | (주)디앤엠코리아 | Abutment for implant |
-
2022
- 2022-08-02 CN CN202210920483.1A patent/CN115213692B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140343706A1 (en) * | 2013-05-14 | 2014-11-20 | Timothy O. Hart | Customizable Healing Abutment |
| KR101536643B1 (en) * | 2014-04-16 | 2015-07-14 | 이명석 | Fixing jig for implant abutment with locking means |
| KR101488258B1 (en) * | 2014-09-17 | 2015-01-30 | 태림메디텍 주식회사 | Jig for Abutment Manufacturing and Processing Method Therewith |
| KR101813877B1 (en) * | 2016-11-10 | 2018-01-30 | (주)명문덴탈 | Double coupling zig with guide |
| KR101858624B1 (en) * | 2017-01-23 | 2018-05-17 | 주식회사 덴티움 | Abutment blank |
| KR20200084676A (en) * | 2019-01-03 | 2020-07-13 | (주)디앤엠코리아 | Abutment for implant |
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| CN115213692B (en) | 2024-03-29 |
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