CN116279830A - Multi-component material mixed integrally formed tubular beam type vehicle body framework without B column - Google Patents
Multi-component material mixed integrally formed tubular beam type vehicle body framework without B column Download PDFInfo
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- CN116279830A CN116279830A CN202310299033.XA CN202310299033A CN116279830A CN 116279830 A CN116279830 A CN 116279830A CN 202310299033 A CN202310299033 A CN 202310299033A CN 116279830 A CN116279830 A CN 116279830A
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- 239000000463 material Substances 0.000 title claims abstract description 19
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 34
- 239000010959 steel Substances 0.000 claims abstract description 34
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 13
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910000797 Ultra-high-strength steel Inorganic materials 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 15
- 238000001746 injection moulding Methods 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 3
- 229910000861 Mg alloy Inorganic materials 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 claims description 3
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 claims description 3
- 229920006351 engineering plastic Polymers 0.000 claims description 3
- 229910052749 magnesium Inorganic materials 0.000 claims description 3
- 239000011777 magnesium Substances 0.000 claims description 3
- 238000007493 shaping process Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 238000005266 casting Methods 0.000 abstract 1
- 238000005457 optimization Methods 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
- B62D25/04—Door pillars ; windshield pillars
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
- B62D25/02—Side panels
- B62D25/025—Side sills thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D27/00—Connections between superstructure or understructure sub-units
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D27/00—Connections between superstructure or understructure sub-units
- B62D27/02—Connections between superstructure or understructure sub-units rigid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D27/00—Connections between superstructure or understructure sub-units
- B62D27/06—Connections between superstructure or understructure sub-units readily releasable
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Body Structure For Vehicles (AREA)
Abstract
The invention relates to a tubular beam type vehicle body framework formed by mixing and integrating multiple materials without a B column, wherein left and right A column upper side beams are integrally formed and processed by an A column upper side beam main body, a handle and a roof beam connecting piece; the upper boundary beam main body of the column A is of a tubular structure and is formed by hot air expansion of steel or aluminum tubes; the handle is obtained by injecting a first material on an A column upper edge beam main body formed by hot air expansion; the roof beam connecting piece is obtained by injecting a second material on the upper boundary beam main body of the A column formed by hot gas expansion; the rear sides of the left and right front side doors are respectively embedded with a first steel tube beam, the front sides of the left and right rear side doors are respectively embedded with a second steel tube beam, and the first and second steel tube beams are ultra-high strength steel tube beam structures formed by hot gas expansion. Compared with the traditional casting structure, the automobile body framework has higher strength and lighter weight, the parts are spliced simply and conveniently, the manufacturing efficiency is improved, the cost is reduced, and the front door and the rear door are opened in a split mode, so that the space in the automobile is optimized.
Description
Technical Field
The invention belongs to the technical field of vehicle body framework structures, and particularly relates to a tubular beam type vehicle body framework formed by mixing and integrating multiple materials without a B column.
Background
As is well known, the automobile body framework forming process and the finished product have higher influence on various performance indexes including safety, reliability and durability, NVH, light weight and the like in the whole automobile. In the prior art, the molding process of the vehicle body framework mainly comprises the following steps: however, these processes still have respective drawbacks, so that the efficiency and cost of the forming process and the specification index of the formed product cannot meet the requirements. For example, current die casting and inflation processes are generally not suitable for use with higher yield strength formed materials; in the mixed forming process including the injection molding step, the quenching and the like cannot be performed due to the limitation of temperature requirements, and the strength of the formed product is low. In the current automobile manufacturing field, no matter functional parts or decorative parts are in a trend of realizing light weight by adopting aluminum materials, plastics and composite materials as much as possible, but the existing stamping welding process and the existing hybrid forming process still need to complete a plurality of independent forming processes for different parts and then assemble the parts, so that the production efficiency of the automobile has a certain degree of obstruction on the productivity of the parts and the whole automobile, and the combined parts of the parts mean the use of more structural reinforcements, so that the automobile light weight is also in a substantial negative effect.
In the prior art, the upper edge beam of the A column is connected with a plurality of metal plates with U-shaped cross sections to form a cavity, and the multilayer structure is unfavorable for the light-weight requirement and has high tooling cost. In the prior art, the B-pillar has the defects of limited mode of leading passengers to get in and out of the vehicle, limited space layout in the vehicle and the like.
Therefore, how to provide a new car body framework structure, which meets the design indexes of corresponding rigidity, strength, light weight and the like, has a simplified structure and simple assembly procedures, and meets the space layout requirements of modern intelligent vehicles.
Disclosure of Invention
In view of the above, the invention provides a tubular beam type vehicle body framework formed by mixing and integrating multiple materials without a B column.
The automobile body framework comprises an automobile body framework main body structure, wherein the automobile body framework main body structure comprises a left side wall module, a right side wall module and a lower automobile body; the left side wall module and the right side wall module are connected with the lower vehicle body;
the left side wall module comprises a left A column upper edge beam, a left A column, a left C column and a left threshold beam; the two ends of the upper boundary beam of the left column A are connected with the left column A and the left column C; the right side wall module comprises a right A column upper edge beam, a right A column, a right C column and a right threshold beam; the two ends of the upper boundary beam of the right A column are connected with the right A column and the right C column;
the left and right A-pillar upper side beams are composed of an A-pillar upper side beam main body, a handle and a roof beam connecting piece, and one roof beam is respectively connected with the roof beam connecting piece of the left A-pillar upper side beam and the roof beam connecting piece of the right A-pillar upper side beam;
the A column upper side beam main body, the handle and the roof beam connecting piece are integrally formed; the upper boundary beam main body of the A column is of a tubular structure and is formed by hot gas expansion of a steel tube or an aluminum tube; the handle is obtained by injecting a first material on the hot-gas expansion-formed A column upper edge beam main body; the roof beam connecting piece is obtained by injecting a second material on the upper boundary beam main body of the A column formed by hot gas expansion;
the rear sides of the left and right front side doors are respectively pre-embedded with a first steel tube beam, the front sides of the left and right rear side doors are respectively pre-embedded with a second steel tube beam, and the first and second steel tube beams are ultra-high strength steel tube beam structures formed by hot gas expansion.
The handle is obtained by injection molding on the hot gas expansion formed A column upper edge beam main body.
The roof beam connecting piece is obtained by injecting aluminum or magnesium or aluminum magnesium alloy on the A column upper side beam main body formed by hot gas expansion.
The vehicle body framework also comprises a front bumper and a rear bumper, and the front bumper is connected with the main body structure of the vehicle body framework through a front longitudinal beam; the rear bumper is connected with the body framework main body structure through a rear longitudinal beam; the front bumper and the rear bumper are formed by hot air expansion.
The automobile body skeleton still includes instrument crossbeam support, instrument crossbeam support includes first main tubular beam, first main tubular beam is through steel pipe or aluminum pipe thermal expansion shaping, first main tubular beam both sides port is connected with left and right A post respectively.
The automobile body skeleton still includes the front end module, the front end module includes the second main tubular beam, the second main tubular beam takes shape through steel pipe or aluminum pipe thermal expansion, the front end module is the mixed integrated into one piece structure of second main tubular beam and engineering plastics.
The ports on two sides of the second main pipe beam are respectively connected with the left front side plate and the right front side plate of the vehicle body, and the left front side plate and the right front side plate are respectively positioned below the left column A and the right column A and used for collision energy absorption.
Left and right side wall module and lower car bodySplice weldingAnd (5) connection.
The left and right A column upper side beams are respectively provided with two roof beam connectors, and the left and right A column upper side beams are respectively provided with two handles.
The invention also relates to a vehicle with the tubular beam type vehicle body framework.
According to the invention, under the condition that the materials of the A-pillar upper side beam main body and the handle and roof beam connecting piece are different, the A-pillar upper side beam main body, the handle and the roof beam connecting piece are integrally formed, so that the splicing difficulty of parts is reduced, the assembly efficiency is improved, and the manufacturing tool and the manufacturing labor input cost can be reduced.
The hot gas expansion tube beam comprises, but is not limited to, an A-column upper edge beam main body, a first steel tube beam, a second steel tube beam, a front bumper, a rear bumper, a main tube beam of a front end module and a main tube beam of an instrument beam bracket, and forms a high-strength vehicle body cage type passenger cabin structure through the hot gas expansion tube beam, so that the weight of a vehicle body is reduced, and the performances of passive safety, durability, NVH and the like of the whole vehicle are effectively improved.
According to the invention, the first steel tube beam and the second steel tube beam are pre-buried in the vehicle door, so that the requirement on the structural strength of the vehicle body under the condition that the vehicle door is closed is ensured, meanwhile, the front and rear door split structure without the traditional B column is more convenient to enter and exit, and the optimization of the space in the vehicle is facilitated.
Drawings
FIG. 1 is a schematic view of a vehicle body frame structure;
FIG. 2 is a schematic diagram of a left side module;
fig. 3 is a schematic view of a roof side rail of the a-pillar.
Each reference numeral represents: 1-left A column upper edge beam; 2-right A column upper edge beam; 3-meter beam rack (CCB); 4-Front End Module (FEM); 5-front anti-collision beams; 6-rear anti-collision beams; 7-left B column; 8-right B column; 11-A column upper side beam main body; 13-a handle; 14 roof rail connectors.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of 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 "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
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 will be understood in specific cases by those of ordinary skill in the art.
The terms of high-strength steel, ultra-high-strength steel, and the like, according to the present invention, have general meanings in the manufacturing and processing fields and the material fields, and those skilled in the art should know the terms, and thus are not described in detail herein.
The pipe beam type vehicle body framework formed by mixing and integrating the multi-component materials without the B column comprises a vehicle body framework main body structure, as shown in figures 1-3, wherein the vehicle body framework main body structure comprises a left side wall module, a right side wall module and a lower vehicle body; the left side wall module and the right side wall module are connected with the lower vehicle body.
The left side wall module comprises a left A column upper edge beam 1, a left A column, a left C column and a left threshold beam; and two ends of the left A column upper boundary beam 1 are connected with a left A column and a left C column.
The right side wall module comprises a right A column upper edge beam 2, a right A column, a right C column and a right threshold beam; and two ends of the upper boundary beam 2 of the right A column are connected with the right A column and the right C column.
The left and right A-pillar roof side rails 1, 2 are respectively formed by integrally forming an A-pillar roof side rail main body 11, a handle 13 and a roof beam connecting piece 14, and the materials of the A-pillar roof side rail main body and the handle and the roof beam connecting piece are different.
The front side of the left front side door and the rear side of the right front side door are respectively embedded with the first steel pipe beams, the front side of the left rear side door and the front side of the right rear side door are respectively embedded with the second steel pipe beams, the first steel pipe beams and the second steel pipe beams are of an ultrahigh-strength steel pipe beam structure formed by hot gas expansion, the first steel pipe beams and the second steel pipe beams are embedded into the vehicle door in advance, the requirement on the structural strength of the vehicle body under the condition that the vehicle door is closed is guaranteed, and meanwhile, the front door and the rear door opposite-opening structure of the traditional B column are free from more convenient in and out, and the optimization of the space in the vehicle is facilitated. Moreover, the first steel tube beam and the second steel tube beam are formed through the ultra-high strength steel tube in a hot expanding mode, and compared with the traditional forming process, the structure is higher in strength and lighter in weight. The A column upper side beam main body 11 is of a tubular structure and is formed by hot air expansion of steel or aluminum tubes; the handle 13 is obtained by injection molding on the hot-air expansion-molded A-pillar upper edge beam main body 11; the roof rail connecting member 14 is obtained by injecting aluminum or magnesium or aluminum magnesium alloy into the a-pillar roof rail main body 11 formed by hot air expansion.
Left and right side wall module and lower car bodySplice weldingAnd (5) connection.
The roof beam is connected with the roof beam connecting piece of left A post roof side rail and the roof beam connecting piece of right A post roof side rail.
The two roof beam connecting pieces of the left and right A column roof side beams are respectively, and the two plastic handles of the left and right A column roof side beams are respectively.
The vehicle body framework further comprises a front bumper 5 and a rear bumper 6, and the front bumper 5 is connected with the main body structure of the vehicle body framework through a front longitudinal beam; the rear bumper 6 is connected with the main body structure of the vehicle body framework through a rear longitudinal beam; the front bumper 5 and the rear bumper 6 are formed by hot air inflation.
The automobile body skeleton still includes instrument crossbeam support 3 (CCB), instrument crossbeam support 3 includes first main tubular beam 31, first main tubular beam 31 is through the steam expansion shaping, first main tubular beam 31 both sides port is connected with left and right A stud respectively.
The body framework further comprises a Front End Module (FEM) 4, the front end module 4 comprises a second main pipe beam, the second main pipe beam 31 is formed by hot air expansion of steel or aluminum pipes, and the front end module is a structure formed by mixing the second main pipe beam and engineering plastics into a whole.
The ports on two sides of the second main pipe beam are respectively connected with left and right front side plates of the automobile body through bolts, and the left and right front side plates are respectively positioned below the left and right A columns and used for collision energy absorption.
According to the invention, under the condition that the materials of the A-pillar upper side beam main body and the handle and the roof beam connecting piece are different, the A-pillar upper side beam main body, the handle and the roof beam connecting piece are integrally formed, so that the difficulty in splicing parts is reduced, the assembly efficiency is improved, and the manufacturing tool and the manufacturing labor input cost are also reduced.
The hot gas expansion tube beam comprises, but is not limited to, an A-column upper edge beam main body, a first steel tube beam, a second steel tube beam, a front bumper, a rear bumper, a main tube beam of a front end module and a main tube beam of an instrument beam bracket, and forms a high-strength vehicle body cage type passenger cabin structure through the hot gas expansion tube beam, so that the weight of a vehicle body is reduced, and the performances of passive safety, durability, NVH and the like of the whole vehicle are effectively improved.
The high-strength car body cage type passenger cabin body structure is formed by the hot air expansion pipe beams of high-strength steel and ultra-high-strength steel, the weight of the car body is reduced, the passive safety, durability, NVH and other performances of the whole car are effectively improved, and the hot air expansion pipe beams comprise, but are not limited to, a main pipe beam of an A-pillar upper side beam main body, a front bumper, a rear bumper and a front end module, and a main pipe beam of an instrument beam bracket.
It should be understood that, the sequence number of each step in the embodiment of the present invention does not mean that the execution sequence of each process should be determined by the function and the internal logic of each process, and should not limit the implementation process of the embodiment of the present invention.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A tubular beam type vehicle body framework formed by mixing and integrating multiple materials without a B column comprises a vehicle body framework main body structure, wherein the vehicle body framework main body structure comprises a left side wall module, a right side wall module and a lower vehicle body; the left side wall module and the right side wall module are connected with the lower vehicle body;
the left side wall module comprises a left A column upper edge beam, a left A column, a left C column and a left threshold beam; two ends of the upper boundary beam of the left A column are respectively connected with the left A column and the left C column; the right side wall module comprises a right A column upper edge beam, a right A column, a right C column and a right threshold beam; the two ends of the upper boundary beam of the right A column are respectively connected with the right A column and the right C column;
the method is characterized in that:
the left and right A-pillar upper side beams are composed of an A-pillar upper side beam main body, a handle and a roof beam connecting piece, and one roof beam is respectively connected with the roof beam connecting piece of the left A-pillar upper side beam and the roof beam connecting piece of the right A-pillar upper side beam;
the A column upper side beam main body, the handle and the roof beam connecting piece are integrally formed; the A column upper side beam main body is of a tubular structure and is formed by hot air expansion of steel or aluminum tubes; the handle is obtained by injecting a first material on the hot-gas expansion-formed A column upper edge beam main body; the roof beam connecting piece is obtained by injecting a second material on the upper boundary beam main body of the A column formed by hot gas expansion;
the rear sides of the left and right front side doors are respectively pre-embedded with a first steel tube beam, the front sides of the left and right rear side doors are respectively pre-embedded with a second steel tube beam, and the first and second steel tube beams are ultra-high strength steel tube beam structures formed by hot gas expansion.
2. The tubular beam-like body frame according to claim 1, wherein: the handle is obtained by injection molding on the hot gas expansion formed A column upper edge beam main body.
3. The tubular beam-like body frame according to claim 1, wherein: the roof beam connecting piece is obtained by injecting aluminum or magnesium or aluminum magnesium alloy on the A column upper side beam main body formed by hot gas expansion.
4. A tubular-girder-like body skeleton according to any one of claims 1 to 3, wherein: the vehicle body framework also comprises a front bumper and a rear bumper, and the front bumper is connected with the main body structure of the vehicle body framework through a front longitudinal beam; the rear bumper is connected with the body framework main body structure through a rear longitudinal beam; the front bumper and the rear bumper are formed by hot air expansion.
5. A tubular-girder-like body skeleton according to any one of claims 1 to 3, wherein: the automobile body skeleton still includes instrument crossbeam support, instrument crossbeam support includes first main tubular beam, first main tubular beam is through steel pipe or aluminum pipe thermal expansion shaping, first main tubular beam both sides port is connected with left and right A post respectively.
6. A tubular-girder-like body skeleton according to any one of claims 1 to 3, wherein: the automobile body skeleton still includes the front end module, the front end module includes the second main tubular beam, the second main tubular beam takes shape through steel pipe or aluminum pipe thermal expansion, the front end module is the mixed integrated into one piece structure of second main tubular beam and engineering plastics.
7. The tubular beam-like body frame according to claim 6, wherein: the ports on two sides of the second main pipe beam are respectively connected with the left front side plate and the right front side plate of the vehicle body, and the left front side plate and the right front side plate are respectively positioned below the left column A and the right column A and used for collision energy absorption.
8. A tubular-girder-like body skeleton according to any one of claims 1 to 3, wherein: left and right side wall module and lower car bodySplice weldingAnd (5) connection.
9. A tubular-girder-like body skeleton according to any one of claims 1 to 3, wherein: the left and right A column upper side beams are respectively provided with two roof beam connectors, and the left and right A column upper side beams are respectively provided with two handles.
10. A vehicle, characterized in that: a tubular beam-like body frame as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310299033.XA CN116279830A (en) | 2023-03-24 | 2023-03-24 | Multi-component material mixed integrally formed tubular beam type vehicle body framework without B column |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310299033.XA CN116279830A (en) | 2023-03-24 | 2023-03-24 | Multi-component material mixed integrally formed tubular beam type vehicle body framework without B column |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116279830A true CN116279830A (en) | 2023-06-23 |
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ID=86822075
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310299033.XA Pending CN116279830A (en) | 2023-03-24 | 2023-03-24 | Multi-component material mixed integrally formed tubular beam type vehicle body framework without B column |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116279830A (en) |
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2023
- 2023-03-24 CN CN202310299033.XA patent/CN116279830A/en active Pending
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