CN114704308A - Composite material side protection plate and processing technology thereof - Google Patents
Composite material side protection plate and processing technology thereof Download PDFInfo
- Publication number
- CN114704308A CN114704308A CN202210358274.2A CN202210358274A CN114704308A CN 114704308 A CN114704308 A CN 114704308A CN 202210358274 A CN202210358274 A CN 202210358274A CN 114704308 A CN114704308 A CN 114704308A
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- China
- Prior art keywords
- hinge structure
- skin
- lower skin
- accommodating space
- composite material
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
- E21D15/50—Component parts or details of props
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- 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
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
Abstract
The invention relates to the technical field of coal mine equipment, in particular to a composite material side protection plate and a processing technology thereof, wherein the side protection plate comprises: the device comprises an upper skin and a lower skin, wherein an accommodating space is formed between the upper skin and the lower skin; the hinge structure is at least partially fixed in the accommodating space, the hinge structure is an integral structure, and a plurality of mounting holes are formed outside the accommodating space; the beam structure is fixedly arranged in the accommodating space and supports the hinge structure; the foam core material is arranged in the accommodating space and fills the accommodating space. According to the invention, the hinge is of an integrated structure, so that load transmission can be ensured, the hinge is supported by the beam structure between the upper skin and the lower skin, the structural performance can be effectively improved, a larger load can be borne, and the foam core material fills the interior to achieve the effects of weight reduction, heat insulation and the like. The composite material side protection plate has greatly reduced weight and excellent structural performance, and can well meet the requirements of underground operation of coal mines.
Description
Technical Field
The invention relates to the technical field of coal mine equipment, in particular to a composite material side protection plate and a processing technology thereof.
Background
The hydraulic support is important supporting equipment for underground coal seam mining, a certain number of shafts, roadways and the like need to be dug before the underground coal seam is mined, and the hydraulic support prevents broken stones from falling off by supporting a stope roof to obtain a safe operation space. The side protection plate is an important component of the hydraulic support and plays a role in supporting the coal wall and preventing the coal wall from being broken. Traditional side plate that protects is metal component, along with hydraulic efficiency's promotion and hydraulic support maximize day by day, side plate dead weight is too big, and easy rust corrosion reduces the protecting effect, and the security reduces, and the operation difficulty, is not convenient for remove and install.
The fiber composite material is a common organic composite material, has the advantages of light weight, simple and convenient preparation and the like, is widely applied to various fields, and has strict requirements on various aspects such as mechanical strength, flame retardant property, antistatic property, wear resistance, service life and the like due to the special operation occasion of the side protection plate. Therefore, the development of a fiber composite material side protection plate is urgently needed, so that the fiber composite material side protection plate can adapt to underground operation of a coal mine and can meet the development requirement of a coal mining technology.
In view of the above problems, the designer is actively researched and innovated based on the abundant practical experience and professional knowledge of many years of engineering application of the products and the application of theory, so as to create a composite material side protection plate and a processing technology thereof, and the composite material side protection plate has higher practicability.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention provides a composite material side protection plate and a processing technology thereof, thereby effectively solving the problems in the background technology.
In order to achieve the purpose, the invention adopts the technical scheme that: a composite toe guard comprising:
the skin-protecting device comprises an upper skin and a lower skin, wherein an accommodating space is formed between the upper skin and the lower skin;
the hinge structure is at least partially fixed in the accommodating space, the hinge structure is an integral structure, and a plurality of mounting holes are formed outside the accommodating space;
the beam structure is fixedly arranged in the accommodating space and supports the hinge structure;
and the foam core material is arranged in the accommodating space and is used for filling the accommodating space.
Furthermore, the lower skin comprises a plate body structure and two flanges, wherein the two flanges are respectively positioned at two ends of the plate body structure and form a U-shaped structure together with the plate body structure;
go up the covering be close to down the one end of covering all around with the laminating of plate body structure, the centre is to keeping away from the one end of covering is protruding down, the accommodation space is located protruding with between the plate body structure, it sets up in two to go up the covering between the flange, and be close to two the both ends of flange are provided with the fluting respectively, hinge structure passes through fluting part is located outside the accommodation space.
Furthermore, the hinge structure is provided with two limiting planes at least at one end close to one of the flanges, one end of each of the two limiting planes is attached to the corresponding flange, the other end of each of the two limiting planes is attached to one end, far away from the corresponding flange, of the corresponding notch, and the flanges and the notches limit the hinge structure through the two limiting planes.
Furthermore, the plate body structure is close to the fixed reinforcement block that is provided with of one end of last covering, the reinforcement block is located and is close to hinge structure is provided with two spacing planar one end, and with the flange laminating, hinge structure is fixed in on the reinforcement block.
Furthermore, the hinge structure comprises at least two connecting ribs in the accommodating space, the at least two connecting ribs are arranged in parallel, the beam structure is located between the two connecting ribs and at least comprises a reinforcing section perpendicular to the two connecting ribs, and two ends of the reinforcing section are respectively attached to the two connecting ribs.
Furthermore, the beam structure comprises a plurality of reinforcing sections, connecting sections are arranged between the reinforcing sections and are perpendicular to the reinforcing sections, a plurality of corner pieces are arranged between the reinforcing sections and the connecting sections, one end of each corner piece is fixedly connected with the reinforcing section, and the other end of each corner piece is fixedly connected with the connecting section.
Further, the lower covering is close to one end of the upper covering is provided with a containing groove, the beam structure is located in the containing groove, and the containing groove is used for limiting the beam structure.
The invention also comprises a processing technology of the composite material side protection plate, which comprises the following steps:
curing and molding the lower skin, placing the lower skin on an assembly table, and sticking an adhesive film on the upper surface of the lower skin;
fixing the hinge structure on the lower skin, adhering the beam structure on the upper surface of the lower skin, and supporting the hinge structure;
filling foam core materials between the beam structure and the hinge structure, and sticking an adhesive film on the top end of the foam;
and adhering the upper skin on the foam core material, and integrally conveying the foam core material into an oven for curing and molding.
Furthermore, before the hinge structure is fixed on the lower skin, a reinforcing block is adhered to the upper surface of the lower skin, the reinforcing block is located at the loaded position of the metal hinge, and after an adhesive film is adhered to the upper surface of the reinforcing block, the hinge structure is adhered to the reinforcing block.
Further, after the beam structure is pasted on the upper surface of the lower skin, corner pieces are pasted at the right angles of the beam structure.
The beneficial effects of the invention are as follows: the hinge structure is used for being connected with the hydraulic support, the hinge is of an integrated structure, load transmission of load can be guaranteed, the beam structure supports the hinge between the upper skin and the lower skin, structural performance can be effectively improved, large load can be borne, the foam core material fills the interior, and the effects of weight reduction, heat insulation and the like are achieved, wherein the hinge structure and the beam structure can be metal pieces and can also be composite pieces after curing and processing. The composite material side protection plate has greatly reduced weight and excellent structural performance, and can well meet the requirements of underground operation of coal mines.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of the construction of the upper protection plate of the present invention;
FIG. 2 is a schematic structural view of an upper skin;
FIG. 3 is a schematic structural view of the lower skin;
FIG. 4 is a schematic structural view of a reinforcing block on a lower skin;
FIG. 5 is a schematic structural view of a hinge structure;
FIG. 6 is a schematic view of the hinge structure on the lower skin;
FIG. 7 is a schematic structural view of a beam-like structure supporting a hinge structure;
fig. 8 is a schematic view of the filled foam core.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like are based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
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; either directly or indirectly through intervening media, or may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
As shown in fig. 1 to 8: a composite toe guard comprising:
the skin-protecting device comprises an upper skin 1 and a lower skin 2, wherein an accommodating space is formed between the upper skin 1 and the lower skin 2;
the hinge structure 3 is at least partially fixed in the accommodating space, the hinge structure 3 is an integral structure, and a plurality of mounting holes are formed outside the accommodating space;
the beam structure 4 is fixedly arranged in the accommodating space and supports the hinge structure 3;
and the foam core material 5 is arranged in the accommodating space and is used for filling the accommodating space.
Through setting up covering 1, covering 2 down, hinge structure 3, roof beam class structure 4 and foam core 5, hinge structure 3 is used for being connected with hydraulic support, because the hinge structure as an organic whole, can guarantee the biography of load and carry, roof beam class structure 4 is between covering 1 and covering 2 down, support the hinge, can effectual improvement structural performance, can bear great load, foam core 5 is filled to the inside, reach and subtract heavy, thermal-insulated effect etc. wherein, hinge structure 3 and roof beam class structure 4 can be the metalwork, also can be for the compound material spare after the solidification processing. The composite material side protection plate has greatly reduced weight and excellent structural performance, and can well meet the requirements of underground operation of a coal mine.
In the present embodiment, the lower skin 2 includes a plate structure 21 and two flanges 22, where the two flanges 22 are respectively located at two ends of the plate structure 21 and form a U-shaped structure with the plate structure 21;
go up covering 1 and laminate with plate body structure 21 around being close to the one end of covering 2 down, it is middle to keeping away from the one end of covering 2 down protruding, and the accommodation space is located between protruding and plate body structure 21, goes up covering 1 and sets up between two flanges 22, and is provided with fluting 11 respectively at the both ends that are close to two flanges 22, and hinge structure 3 is located outside the accommodation space through fluting 11 part.
Through will covering 2 down set up plate body structure 21 and two flanges 22, wherein two flanges 22 carry on spacingly to last covering 1, easy to assemble and location, it is protruding in the middle of 1 to go up covering, both ends are provided with fluting 11, thereby hinge structure 3 is located outside the accommodation space through fluting 11 part, in order to satisfy the installation demand, hinge structure 3 is structure as an organic whole simultaneously, and the part is located the accommodation space, thereby after whole solidification, the load that the hinge received can be conducted and protect the each department of group's board, thereby prevent that local load is too big, cause the condition such as fracture.
Wherein, hinge structure 3 is provided with two spacing planes 31 at least in the one end that is close to one of them flange 22, and one of them one end of two spacing planes 31 is laminated with flange 22, and the other end is laminated mutually with the one end that the flange 22 was kept away from to fluting 11, and flange 22 and fluting 11 carry out spacing to hinge structure 3 through two spacing planes 31.
Through two limiting planes 31, one rib 22 and one slot 11 on the hinge structure 3, the position of the hinge structure 3 is fixed, and the hinge structure 3 is prevented from deviating from the position between the lower skin 2 and the upper skin 1 after being stressed greatly, so that the use of the side protection plate is influenced.
Preferably, in the above embodiment, the plate structure 21 is provided with a reinforcing block 23 at one end close to the upper skin 1, the reinforcing block 23 is located at one end close to the hinge structure 3 provided with two limiting planes 31, and is attached to the rib 22, and the hinge structure 3 is fixed on the reinforcing block 23.
In order to prevent the lower skin 2 from being torn due to overlarge local load on the lower skin 2, the reinforcing block 23 is arranged on the lower skin 2, the loaded part of the hinge structure 3 is fixed on the reinforcing block 23 by taking the end, provided with the limiting plane 31, of the hinge structure 3 as the loaded part, the load is distributed to the lower skin 2 through the reinforcing block 23, the stressed area is increased, and the lower skin 2 is effectively prevented from being torn.
In this embodiment, the hinge structure 3 includes at least two connecting ribs 32 in the accommodating space, the at least two connecting ribs 32 are arranged in parallel, the beam structure 4 is located between the two connecting ribs 32, and at least includes a reinforcing section 41 perpendicular to the two connecting ribs 32, and two ends of the reinforcing section 41 are respectively attached to the two connecting ribs 32.
Because hinge structure 3 is structure as an organic whole, so the part need be located the accommodation space, through set up two at least splice bars 32 with hinge structure 3 in the accommodation space to hinge structure 3 can play the effect that the structure is strengthened after whole solidification moulding, and roof beam class structure 4 is located between two splice bars 32, strengthens two splice bars 32 of 41 perpendicular to of section, thereby carries out the structure reinforcement to another direction.
As a preference of the above embodiment, the beam-like structure 4 includes a plurality of reinforcing segments 41, connecting segments 42 are disposed between the reinforcing segments 41, the connecting segments 42 are perpendicular to the plurality of reinforcing segments 41, a plurality of corner pieces 43 are disposed between the reinforcing segments 41 and the connecting segments 42, one end of each corner piece 43 is fixedly connected to the reinforcing segment 41, and the other end is fixedly connected to the connecting segments 42.
Through setting up a plurality of reinforcement sections 41 and linkage segment 42, set up a plurality of fillets 43 between reinforcement section 41 and the linkage segment 42 to further structural reinforcement to beam structure 4 increases the anti buckling ability of beam structure 4, increases load carrying capacity.
As a preference of the above embodiment, the lower skin 2 is provided with a receiving groove 24 at one end close to the upper skin 1, the beam-like structure 4 is located in the receiving groove 24, and the receiving groove 24 limits the beam-like structure 4.
Through set up holding tank 24 on covering 2 down to carry on spacingly to roof beam class structure 4, prevent roof beam class structure 4 skew, thereby influence the supporting effect.
The embodiment also comprises a processing technology of the composite material side protection plate, which comprises the following steps:
curing and molding the lower skin 2, placing the lower skin on an assembly table, and sticking an adhesive film on the upper surface of the lower skin 2;
fixing the hinge structure 3 on the lower skin 2, and sticking the beam structure 4 on the upper surface of the lower skin 2 to support the hinge structure 3;
filling a foam core material 5 between the beam structure 4 and the hinge structure 3, and adhering a glue film on the top end of the foam;
and (3) adhering the upper skin 1 to the foam core material 5, and integrally conveying the foam core material into an oven for curing and molding.
Before the hinge structure 3 is fixed on the lower skin 2, the upper reinforcing block 23 is adhered to the upper surface of the lower skin 2, the reinforcing block 23 is located at the loaded position of the metal hinge, and after an adhesive film is adhered to the upper surface of the reinforcing block 23, the hinge structure 3 is adhered to the reinforcing block 23.
As a preferable example of the above embodiment, after the beam-like structure 4 is attached to the upper surface of the lower skin 2, the corner piece 43 is attached to the right angle of the beam-like structure 4.
Through the processing technology of the composite material side protection plate, the technology is simple, after the lower skin 2 is solidified, the hinge structure 3 and the beam structure 4 are processed, the composite material side protection plate can be obtained only by simple assembly and then integral solidification, the weight of the composite material side protection plate is greatly reduced, the structural performance is excellent, and the underground operation of a coal mine can be well met.
It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A composite material upper guard, comprising:
the skin-protecting device comprises an upper skin and a lower skin, wherein an accommodating space is formed between the upper skin and the lower skin;
the hinge structure is at least partially fixed in the accommodating space, the hinge structure is an integral structure, and a plurality of mounting holes are formed outside the accommodating space;
the beam structure is fixedly arranged in the accommodating space and supports the hinge structure;
and the foam core material is arranged in the accommodating space and is used for filling the accommodating space.
2. The composite material upper guard according to claim 1, wherein the lower skin comprises a plate structure and two flanges, the two flanges are respectively located at two ends of the plate structure and form a U-shaped structure together with the plate structure;
go up the covering be close to down the one end of covering all around with the laminating of plate body structure, the centre is to keeping away from the one end of covering is protruding down, the accommodation space is located protruding with between the plate body structure, it sets up in two to go up the covering between the flange, and be close to two the both ends of flange are provided with the fluting respectively, hinge structure passes through fluting part is located outside the accommodation space.
3. The composite toe guard according to claim 2, wherein the hinge structure has two limiting planes at least at one end near one of the flanges, one end of the two limiting planes is attached to the flange, the other end of the two limiting planes is attached to one end of the slot away from the flange, and the flange and the slot limit the hinge structure through the two limiting planes.
4. The composite material upper guard according to claim 3, wherein a reinforcing block is fixedly disposed at one end of the plate structure close to the upper skin, the reinforcing block is disposed at one end of the plate structure close to the hinge structure where the two limiting planes are disposed, and is attached to the rib, and the hinge structure is fixed to the reinforcing block.
5. The composite material upper guard according to claim 1, wherein the hinge structure includes at least two connecting ribs in the accommodating space, the at least two connecting ribs are arranged in parallel, the beam structure is located between the two connecting ribs and includes at least one reinforcing section perpendicular to the two connecting ribs, and two ends of the reinforcing section are respectively attached to the two connecting ribs.
6. The composite material upper guard according to claim 5, wherein the beam-like structure includes a plurality of the reinforcing segments, a connecting segment is disposed between the reinforcing segments, the connecting segment is perpendicular to the plurality of reinforcing segments, a plurality of corner pieces are disposed between the reinforcing segments and the connecting segment, and each corner piece has one end fixedly connected to the reinforcing segment and the other end fixedly connected to the connecting segment.
7. The composite material side apron of claim 1, wherein the lower skin is provided with a receiving groove at an end adjacent to the upper skin, the beam-like structure being located in the receiving groove, and the receiving groove is configured to retain the beam-like structure.
8. A processing technology of a composite material side protection plate is characterized by comprising the following steps:
curing and molding the lower skin, placing the lower skin on an assembly table, and sticking an adhesive film on the upper surface of the lower skin;
fixing the hinge structure on the lower skin, adhering the beam structure on the upper surface of the lower skin, and supporting the hinge structure;
filling foam core materials between the beam structure and the hinge structure, and sticking an adhesive film on the top end of the foam;
and adhering the upper skin on the foam core material, and integrally conveying the foam core material into an oven for curing and molding.
9. The processing technology of the composite material side protection plate according to claim 8, wherein before the hinge structure is fixed on the lower skin, a reinforcing block is pasted on the upper surface of the lower skin, the reinforcing block is positioned at the loaded position of the metal hinge, and after an adhesive film is pasted on the upper surface of the reinforcing block, the hinge structure is pasted on the reinforcing block.
10. The process for manufacturing a composite material side apron according to claim 8, wherein after the beam-like structure is adhered to the upper surface of the lower skin, corner pieces are adhered to right angles of the beam-like structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210358274.2A CN114704308B (en) | 2022-04-06 | 2022-04-06 | Composite material side protection plate and processing technology thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210358274.2A CN114704308B (en) | 2022-04-06 | 2022-04-06 | Composite material side protection plate and processing technology thereof |
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| CN114704308A true CN114704308A (en) | 2022-07-05 |
| CN114704308B CN114704308B (en) | 2022-10-25 |
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| NL6813263A (en) * | 1967-09-18 | 1969-03-20 | ||
| GB2078628A (en) * | 1980-05-21 | 1982-01-13 | British Aluminium Co Ltd | Load bearing panels |
| GB2238820A (en) * | 1989-12-09 | 1991-06-12 | Gewerk Eisenhuette Westfalia | Mine roof supports |
| CN103670475A (en) * | 2013-12-04 | 2014-03-26 | 郑州煤矿机械集团股份有限公司 | Flexible guarding protection-assisting device for hydraulic support |
| CN207267446U (en) * | 2017-08-29 | 2018-04-24 | 石嘴山市鼎力支护设备有限公司 | Lightweight hatch door for new-energy automobile |
| CN110792460A (en) * | 2019-10-31 | 2020-02-14 | 神华神东煤炭集团有限责任公司 | Hydraulic support side protection plate and preparation method thereof |
| CN111301122A (en) * | 2020-04-16 | 2020-06-19 | 东风专用汽车有限公司 | Lightweight flat plate type door structure |
| CN211174168U (en) * | 2019-12-04 | 2020-08-04 | 神华神东煤炭集团有限责任公司 | Side protection plate and ultra-large mining height hydraulic support |
| CN112440081A (en) * | 2020-11-25 | 2021-03-05 | 上海晋飞碳纤科技股份有限公司 | Integrally formed large-scale product and manufacturing method thereof |
| CN112896210A (en) * | 2020-12-31 | 2021-06-04 | 安徽博微长安电子有限公司 | Large-size light-weight turnable top cover device |
| CN112977798A (en) * | 2021-02-19 | 2021-06-18 | 湖北吉利太力飞车有限公司 | Wing assembly and hovercar |
-
2022
- 2022-04-06 CN CN202210358274.2A patent/CN114704308B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL6813263A (en) * | 1967-09-18 | 1969-03-20 | ||
| GB2078628A (en) * | 1980-05-21 | 1982-01-13 | British Aluminium Co Ltd | Load bearing panels |
| GB2238820A (en) * | 1989-12-09 | 1991-06-12 | Gewerk Eisenhuette Westfalia | Mine roof supports |
| CN103670475A (en) * | 2013-12-04 | 2014-03-26 | 郑州煤矿机械集团股份有限公司 | Flexible guarding protection-assisting device for hydraulic support |
| CN207267446U (en) * | 2017-08-29 | 2018-04-24 | 石嘴山市鼎力支护设备有限公司 | Lightweight hatch door for new-energy automobile |
| CN110792460A (en) * | 2019-10-31 | 2020-02-14 | 神华神东煤炭集团有限责任公司 | Hydraulic support side protection plate and preparation method thereof |
| CN211174168U (en) * | 2019-12-04 | 2020-08-04 | 神华神东煤炭集团有限责任公司 | Side protection plate and ultra-large mining height hydraulic support |
| CN111301122A (en) * | 2020-04-16 | 2020-06-19 | 东风专用汽车有限公司 | Lightweight flat plate type door structure |
| CN112440081A (en) * | 2020-11-25 | 2021-03-05 | 上海晋飞碳纤科技股份有限公司 | Integrally formed large-scale product and manufacturing method thereof |
| CN112896210A (en) * | 2020-12-31 | 2021-06-04 | 安徽博微长安电子有限公司 | Large-size light-weight turnable top cover device |
| CN112977798A (en) * | 2021-02-19 | 2021-06-18 | 湖北吉利太力飞车有限公司 | Wing assembly and hovercar |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114704308B (en) | 2022-10-25 |
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