CN110696393A - Steel pipe/fiber reinforced plastic composite support rod and preparation method thereof - Google Patents
Steel pipe/fiber reinforced plastic composite support rod and preparation method thereof Download PDFInfo
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- CN110696393A CN110696393A CN201910819758.0A CN201910819758A CN110696393A CN 110696393 A CN110696393 A CN 110696393A CN 201910819758 A CN201910819758 A CN 201910819758A CN 110696393 A CN110696393 A CN 110696393A
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- steel pipe
- reinforced plastic
- plastic composite
- support rod
- fiber reinforced
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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
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
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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
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
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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
- B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
- B29C69/001—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore a shaping technique combined with cutting, e.g. in parts or slices combined with rearranging and joining the cut parts
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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
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
- B29C70/681—Component parts, details or accessories; Auxiliary operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/14—Layered products comprising a layer of metal next to a fibrous or filamentary layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/18—Layered products comprising a layer of metal comprising iron or steel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Thermal Sciences (AREA)
- Laminated Bodies (AREA)
Abstract
The invention relates to a steel pipe/fiber reinforced plastic composite support rod and a preparation method thereof, relating to the technical field of nursery stock support frames, wherein the steel pipe/fiber reinforced plastic composite support rod comprises the following components: the steel pipe, the unidirectional yarn layer and the fiber felt layer are laid in sequence from inside to outside; the steel pipe is a thin-wall steel pipe; the unidirectional yarn layer is formed by coating fibers on the steel pipe in a unidirectional way along the direction of the straightened steel pipe after the fibers are dipped in glue; the fibre felt layer is the fibre felt cladding and is in what form on the one-way yarn layer, it is poor to have solved common trees class bracing piece fastness on the market, it is perishable to bury the part, iron and steel class bracing piece weight is big, perishable, transportation installation cost is high, high polymer material pole warp greatly, and the long bracing piece of fibre reinforced plastic has the modulus low, yielding, with high costs, the technical problem that the mounting hole needs the reinforcement, reached and made steel pipe/fibre reinforced plastic composite support pole can promote the modulus under the prerequisite of guaranteeing excellent performance, reduce the deformation, increase the bracing piece and use the fastness, reduce the damaged probability of mounting hole, reduce cost's beneficial effect, but wide application in plant cultivation, specifically include the cultivation of various crops, woods, fruit trees, flowers and plants such as medicinal and ornamental.
Description
Technical Field
The invention relates to the technical field of nursery stock support frames, in particular to a steel pipe/fiber reinforced plastic composite support rod and a preparation method thereof.
Background
The nursery stock support frame is that trees are after planting or transplanting process, and the root system has not stretched yet, and in order to prevent it from taking place to incline and fall under the exogenic action, in order to ensure its survival rate, often adopt the fixed bolster to fix it after planting. At present, the bracing piece material is the fir pole mostly, the pine pole, the eucalyptus pole, the bamboo pole, the galvanized steel pipe, high polymer material pole, fibre reinforced plastic pole and pole body upper portion are timber, the lower part is the material of steel, common trees class bracing piece fastness on the market is poor, it is perishable to bury partially, steel class bracing piece weight is big, perishable, the transportation installation cost is high, high polymer material pole warp greatly, and the long bracing piece of fibre reinforced plastic has the modulus low, yielding, and is with high costs, the problem that the mounting hole needs the reinforcement.
Disclosure of Invention
In view of the above, the invention provides a steel pipe/fiber reinforced plastic composite support rod and a preparation method thereof, so as to solve the problems of the existing support rod.
The technical scheme adopted by the invention for solving the technical problems is as follows:
in a first aspect, the embodiment of the invention provides a steel pipe/fiber reinforced plastic composite supporting rod, which comprises a steel pipe, a unidirectional yarn layer and a fiber felt layer which are sequentially paved from inside to outside;
the steel pipe is a thin-wall steel pipe.
The unidirectional yarn layer is formed by coating fibers on the steel pipe in a unidirectional way along the direction of the straightened steel pipe after the fibers are dipped in glue;
the fiber felt layer is formed by coating fiber felt on the unidirectional yarn layer.
In combination with the first aspect, embodiments of the present invention provide a first possible embodiment of the first aspect, wherein the fiber mat layer is composed of a continuous fiber mat.
In combination with the first aspect, embodiments of the present invention provide a second possible embodiment of the first aspect, wherein the fiber mat layer is made of a polyester fiber mat.
With reference to the first aspect, an embodiment of the present invention provides a third possible embodiment of the first aspect, where a winding layer is laid on the steel pipe and the unidirectional yarn layer, and the winding layer is formed by winding and covering continuous fibers around the unidirectional yarn layer.
With reference to the first aspect, an embodiment of the present invention provides a fourth possible embodiment of the first aspect, wherein two ends of the steel tube/fiber reinforced plastic composite support rod are provided with a sealing element.
With reference to the first aspect, an embodiment of the present invention provides a fifth possible embodiment of the first aspect, wherein the steel tube/fiber reinforced plastic composite support rod is round, square or irregular.
In a second aspect, an embodiment of the present invention provides a method for manufacturing a steel pipe/fiber reinforced plastic composite support rod, including the following steps:
step S1, after gum dipping, the fiber is coated on the steel pipe in a unidirectional way along the direction of the mould core to form a unidirectional yarn layer;
step S2, coating the fiber felt on the unidirectional yarn layer to form a fiber felt layer;
step S3, after the steel pipe, the unidirectional yarn layer and the fiber felt layer are dipped, curing the steel pipe, the unidirectional yarn layer and the fiber felt layer in a mould to form the steel pipe/fiber reinforced plastic composite support rod;
and step S4, pulling, moving and demoulding the formed steel pipe/fiber reinforced plastic composite support rod.
Step S5, cutting the drawn steel pipe/fiber reinforced plastic composite support rod into a finished product according to the length required by actual design;
and step S6, installing sealing elements at two ends of the finished steel pipe/fiber reinforced plastic composite support rod.
The steel/fiber reinforced plastic composite material has the advantages that the steel/fiber reinforced plastic composite material is composed of the inner layer steel material and the outer layer fiber reinforced plastic, and has the characteristics of strength and hardness of steel, light weight, high strength, corrosion resistance and the like of the fiber reinforced plastic, so that the steel pipe/fiber reinforced plastic composite support rod can improve the modulus, reduce deformation, increase the use firmness of the support rod, reduce the damage probability of a mounting hole and reduce cost on the premise of guaranteeing the excellent performance, can be widely applied to plant cultivation, and particularly comprises cultivation of various crops, woods, fruit trees, flowers, medicinal plants, ornamental plants and the like.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Description of the invention
The technical solution of the present invention will be described in further detail with reference to the accompanying drawings and examples, but it should be understood that these drawings are designed for illustrative purposes only and are some embodiments of the present invention, and it will be apparent to those skilled in the art that other drawings can be obtained without inventive effort, and therefore the scope of the present invention is not limited. Furthermore, unless otherwise indicated, the drawings are intended to be illustrative of the structural configurations described herein and are not necessarily drawn to scale.
The invention is further illustrated with reference to the following figures and examples.
Fig. 1 is a schematic cross-sectional view of a steel pipe/fiber reinforced plastic composite support rod according to an embodiment of the present invention.
Fig. 2 is a schematic cross-sectional view of a steel pipe/fiber reinforced plastic composite support rod provided by an embodiment of the present invention with a winding layer added.
Fig. 3 is a schematic view of a finished steel tube/fiber reinforced plastic composite support rod according to an embodiment of the present invention.
In the figure, 1 is a steel pipe, 2 is a unidirectional yarn layer, 3 is a fiber felt layer, 4 is a winding layer, and 5 is a sealing element.
Detailed description of the preferred embodiments
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer and more complete description of the technical solutions of the present invention will be given below with reference to the accompanying drawings, and it is obvious that the described embodiments are some embodiments of the present invention, not all embodiments, and all other embodiments obtained by those skilled in the art without any creative work may be obtained. All fall within the scope of protection of the present invention.
The nursery stock support frame is that trees are after planting or transplanting process, and the root system has not stretched yet, and in order to prevent it from taking place to incline and fall under the exogenic action, in order to ensure its survival rate, often adopt the fixed bolster to fix it after planting. At present, the support rods are mostly made of fir rods, pine rods, eucalyptus rods, bamboo rods, galvanized steel tubes, high polymer material rods, fiber reinforced plastic rods and steel materials, the upper parts of the rods are made of wood, the lower parts of the rods are made of steel, the common tree support rods on the market are poor in firmness, the soil-entering parts are easy to rot, the steel support rods are heavy in weight, easy to corrode and high in transportation and installation cost, the high polymer material rods are large in deformation, and the long fiber reinforced plastic support rods are low in modulus, easy to deform and high in cost, and the installation holes need to be reinforced. Thereby make steel pipe/fibre reinforced plastic composite support rod can promote the modulus under the prerequisite of guaranteeing excellent performance, reduce and warp, increase the bracing piece and use the firmness, reduce the damaged probability of mounting hole, reduce cost, but wide application in plant cultivation specifically includes the cultivation of various crops, woods, fruit tree, flowers and plants, plants such as medicinal and view and admire
In order to facilitate understanding of the embodiment, a steel pipe/fiber reinforced plastic composite support rod and a method for manufacturing the same disclosed in the embodiment of the present invention are described in detail with reference to fig. 1-3, and include a steel pipe 1, a unidirectional yarn layer 2 and a fiber felt layer 3 sequentially laid from inside to outside;
the steel pipe 1 is a thin-wall steel pipe;
in the embodiment of the invention, the thin-wall steel pipe can improve the rigidity of the material while ensuring the light weight and the high strength of the steel pipe/fiber reinforced plastic composite support rod.
The unidirectional yarn layer 2 is formed by coating fibers on the steel pipe 1 in a unidirectional way along the direction of the straightened steel pipe after the fibers are dipped;
in the embodiment of the invention, the steel pipe 1 is used for priming, so that the distribution of annular fibers is realized, the cracking of a one-way yarn layer in the process of bearing load is reduced, and the mechanical strength of the support rod is ensured to be higher.
The fiber felt layer 3 is formed by coating fiber felt on the unidirectional yarn layer 2;
in the embodiment of the invention, the fiber felt layer 3 can greatly improve the circumferential strength of the support frame, and is arranged on the outermost layer, so that the content of resin adhesive is improved, and the corrosion resistance is ensured.
The fiber felt layer 3 is made of continuous fiber felt;
in the embodiment of the present invention, more optional fiber materials are provided for the fiber mat layer 3, and when the fiber mat layer 3 is made of continuous fiber mat, the requirements of outdoor operation can be met.
The fiber felt layer 3 is made of polyester fiber felt;
in the embodiment of the present invention, more optional fiber materials are provided for the fiber felt layer 3, and when the fiber felt layer 3 is formed of polyester fiber felt, the requirement of indoor application can be met.
A winding layer 4 is laid on the steel pipe 1 and the unidirectional yarn layer 2, and the winding layer 4 is formed by winding and coating continuous fibers on the unidirectional yarn layer 2 in an annular manner;
sealing elements 5 are arranged at two ends of the steel pipe/fiber reinforced plastic composite supporting rod;
in the embodiment of the invention, the corrosion resistance of the steel pipe/fiber reinforced plastic composite support rod is improved by installing the sealing element 5.
In the embodiment of the invention, the winding layer 4 is formed by winding the fibers circumferentially, and because the continuous fibers are circumferentially distributed and are not overlapped, the stress concentration in use is reduced, the circumferential mechanical strength is increased, and the anti-bending performance is higher.
The steel pipe/fiber reinforced plastic composite support rod is round, square or special-shaped;
in the embodiment of the invention, the shape structure of the support column 5 is explained, so that the shape structure of the steel pipe/fiber reinforced plastic composite support rod is more diversified and has larger choice.
In another embodiment of the present invention, a method for manufacturing a steel pipe/fiber reinforced plastic composite support rod is also provided, which may include the following steps:
step S1, after gum dipping, the fiber is coated on the steel pipe in a unidirectional way along the direction of the mould core to form a unidirectional yarn layer;
step S2, coating the fiber felt on the unidirectional yarn layer to form a fiber felt layer;
step S3, after the steel pipe, the unidirectional yarn layer and the fiber felt layer are dipped, curing the steel pipe, the unidirectional yarn layer and the fiber felt layer in a mould to form the steel pipe/fiber reinforced plastic composite support rod;
the steel pipe, the unidirectional yarn layer and the fiber felt layer are fixed at specific positions of pultrusion equipment, then are solidified in a mould, and finally the steel pipe/fiber reinforced plastic composite support rod is molded.
Step S4, pulling, moving and demoulding the formed steel pipe/fiber reinforced plastic composite support rod;
and step S5, cutting the drawn steel pipe/fiber reinforced plastic composite support rod into a finished product according to the length required by actual design.
And step S6, installing sealing elements at two ends of the finished steel pipe/fiber reinforced plastic composite support rod.
Unless specifically stated otherwise, the relative steps, numerical expressions, and values of the components and steps set forth in these embodiments do not limit the scope of the present invention.
In all examples shown and described herein, any particular value should be construed as merely exemplary, and not as a limitation, and thus other examples of example embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In addition, in the description of the embodiments of the present invention, 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 in specific cases to those skilled in the art.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular 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.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. The utility model provides a steel pipe/fiber reinforced plastic composite support rod, characterized by: comprises a steel pipe (1), a unidirectional yarn layer (2) and a fiber felt layer (3) which are sequentially paved from inside to outside;
the steel pipe (1) is a thin-wall steel pipe;
the unidirectional yarn layer (2) is formed by coating fibers on the steel pipe (1) in a unidirectional way along the direction of the straightened steel pipe after the fibers are dipped;
the fiber felt layer (3) is formed by coating the fiber felt on the unidirectional yarn layer (2).
2. The steel pipe/fiber reinforced plastic composite support rod as claimed in claim 1, wherein: the fiber felt layer (3) is formed by continuous fiber felt.
3. The steel pipe/fiber reinforced plastic composite support rod as claimed in claim 1, wherein: the fiber felt layer (3) is formed by polyester fiber felt.
4. The steel pipe/fiber reinforced plastic composite support rod as claimed in claim 1, wherein: the steel pipe (1) with one-way yarn layer (2) upper berth is equipped with winding layer (4), winding layer (4) are continuous fiber hoop winding cladding in one-way yarn layer (2) form.
5. The steel pipe/fiber reinforced plastic composite support rod as claimed in claim 1, wherein: and sealing elements (5) are arranged at two ends of the steel pipe/fiber reinforced plastic composite supporting rod.
6. The steel pipe/fiber reinforced plastic composite support rod as claimed in claim 1, wherein: the steel pipe/fiber reinforced plastic composite support rod is round, square or special-shaped.
7. A preparation method of a steel pipe/fiber reinforced plastic composite support rod is characterized by comprising the following steps:
step S1, after gum dipping, the fiber is coated on the steel pipe in a unidirectional way along the direction of the mould core to form a unidirectional yarn layer;
step S2, coating the fiber felt on the unidirectional yarn layer to form a fiber felt layer;
step S3, after the steel pipe, the unidirectional yarn layer and the fiber felt layer are dipped, curing the steel pipe, the unidirectional yarn layer and the fiber felt layer in a mould to form the steel pipe/fiber reinforced plastic composite support rod;
and step S4, pulling, moving and demoulding the formed steel pipe/fiber reinforced plastic composite support rod.
Step S5, cutting the drawn steel pipe/fiber reinforced plastic composite support rod into a finished product according to the length required by actual design;
and step S6, installing sealing elements at two ends of the finished steel pipe/fiber reinforced plastic composite support rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910819758.0A CN110696393A (en) | 2019-08-31 | 2019-08-31 | Steel pipe/fiber reinforced plastic composite support rod and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910819758.0A CN110696393A (en) | 2019-08-31 | 2019-08-31 | Steel pipe/fiber reinforced plastic composite support rod and preparation method thereof |
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| CN110696393A true CN110696393A (en) | 2020-01-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910819758.0A Pending CN110696393A (en) | 2019-08-31 | 2019-08-31 | Steel pipe/fiber reinforced plastic composite support rod and preparation method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2660882Y (en) * | 2003-07-15 | 2004-12-08 | 四川省简阳市建川实业有限公司 | Corrosion resistant component arranged for greenhouse |
| CN201238511Y (en) * | 2008-07-25 | 2009-05-20 | 张文 | Support lever for greenhouse frame |
| CN205618844U (en) * | 2016-05-11 | 2016-10-05 | 浙江伟星新型建材股份有限公司 | Carbon fiber fag end is compound pipe of reinforcing in coordination |
| CN109680801A (en) * | 2018-12-27 | 2019-04-26 | 中鑫绿建控股有限公司 | Flitch keel, production equipment and the production method wrapped up based on felt-cloth, fiber |
-
2019
- 2019-08-31 CN CN201910819758.0A patent/CN110696393A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2660882Y (en) * | 2003-07-15 | 2004-12-08 | 四川省简阳市建川实业有限公司 | Corrosion resistant component arranged for greenhouse |
| CN201238511Y (en) * | 2008-07-25 | 2009-05-20 | 张文 | Support lever for greenhouse frame |
| CN205618844U (en) * | 2016-05-11 | 2016-10-05 | 浙江伟星新型建材股份有限公司 | Carbon fiber fag end is compound pipe of reinforcing in coordination |
| CN109680801A (en) * | 2018-12-27 | 2019-04-26 | 中鑫绿建控股有限公司 | Flitch keel, production equipment and the production method wrapped up based on felt-cloth, fiber |
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Effective date of registration: 20200728 Address after: Room 101, building 2, No.1 Chishan Road, Zhangmutou town, Dongguan City, Guangdong Province 523000 Applicant after: Dongguan Kaida Technology Co.,Ltd. Address before: 523000 No.1 Chishan Road, Zhangmutou town, Dongguan City, Guangdong Province Applicant before: Dongguan Xintian Industry Co.,Ltd. |
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Application publication date: 20200117 |