CN109109341B - Preparation method of wind power blade - Google Patents
Preparation method of wind power blade Download PDFInfo
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- CN109109341B CN109109341B CN201811239362.0A CN201811239362A CN109109341B CN 109109341 B CN109109341 B CN 109109341B CN 201811239362 A CN201811239362 A CN 201811239362A CN 109109341 B CN109109341 B CN 109109341B
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- pressure side
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- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 239000004744 fabric Substances 0.000 claims abstract description 28
- 239000003365 glass fiber Substances 0.000 claims abstract description 21
- 239000011347 resin Substances 0.000 claims abstract description 16
- 229920005989 resin Polymers 0.000 claims abstract description 16
- 238000000465 moulding Methods 0.000 claims abstract description 15
- 239000011162 core material Substances 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims description 28
- 239000000853 adhesive Substances 0.000 claims description 16
- 230000001070 adhesive effect Effects 0.000 claims description 16
- 239000003292 glue Substances 0.000 claims description 15
- 238000002347 injection Methods 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 8
- 238000005086 pumping Methods 0.000 claims description 6
- 238000001746 injection moulding Methods 0.000 claims 1
- 230000007547 defect Effects 0.000 abstract description 11
- 238000004519 manufacturing process Methods 0.000 description 11
- 230000001788 irregular Effects 0.000 description 10
- 238000001723 curing Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 230000037303 wrinkles Effects 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000003908 quality control method Methods 0.000 description 2
- 239000012945 sealing adhesive Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
- B29C70/36—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and impregnating by casting, e.g. vacuum casting
-
- 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
- B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/08—Blades for rotors, stators, fans, turbines or the like, e.g. screw propellers
- B29L2031/082—Blades, e.g. for helicopters
- B29L2031/085—Wind turbine blades
Abstract
The invention discloses a preparation method of a wind power blade, which comprises the following steps: laying glass fiber cloth, a girder and a sandwich in a suction side/pressure side shell mold, then pouring resin in vacuum, and curing and demolding to obtain an integrally formed object of the shell and the girder; paving glass fiber cloth, core material and glass fiber cloth in sequence in a wind power blade prefabricated rear edge mold, pouring resin in vacuum, curing and demolding to obtain a prefabricated rear edge; the prefabricated rear edge is a part obtained by integrally molding the rear edge of the suction side shell and the rear edge of the pressure side shell; the two ends of the front edge web plate and the rear edge web plate are respectively bonded to the suction side girder and the pressure side girder, and the front edge parts of the suction side shell and the pressure side shell are bonded; and (5) bonding the prefabricated rear edge with the suction side shell and the pressure side shell to obtain the wind power blade. The prefabricated rear edge can refine control points and avoid the forming defects such as folds and the like to the maximum extent; the bonding surface of the prefabricated rear edge and the shell is a plane, so that the bonding difficulty is greatly reduced, and the quality can be ensured.
Description
Technical Field
The invention belongs to the technical field of wind power blades, and particularly relates to a preparation method of a wind power blade.
Background
With the coming of new energy equity times, in the development of the trend of large-size wind power blades, low cost and high reliability become design and manufacturing keys. At present, the structure of a wind power blade generally comprises a blade suction side shell, a blade pressure side shell and a web plate, wherein a girder and the web plate are prefabricated and molded, the prefabricated girder and the blade shell are poured and molded together in production, and the molded suction side shell, the prefabricated web plate and the pressure side shell are bonded through structural glue to complete the final wind power blade structure. The front edge and the rear edge of the blade shell are integrally formed with the blade suction side shell and the blade pressure side shell, finally the front edge of the blade suction side shell is bonded with the front edge of the blade pressure side shell, and the rear edge of the blade suction side shell is bonded with the rear edge of the blade pressure side shell. Because the shell of the wind power blade is an irregular curved surface, the rear edge of the wind power blade is an irregular cavity, and therefore the manufacturing method is difficult in paving and bonding operation and is easy to cause defects of wrinkles, glue shortage and the like on the rear edge of the wind power blade.
Patent application No. CN201720866497.4 proposes a wind blade, and paragraph 0028 of the specification discloses a manufacturing method of the wind blade, which includes: the blade is divided into two half pieces, and each half piece of the blade is of a sandwich structure of glass fiber cloth-core material-glass fiber cloth; laying an A-surface cloth layer on each half, laying a crossbeam, laying a core material after the crossbeam is laid, starting a B-surface laying after the core material is laid, obtaining the shape of the inner cavity of the rear edge through a blade model, laying a shell cloth layer, then laying an auxiliary material, pouring and curing, and removing the auxiliary material after curing is finished; coating structural adhesive on the front edge and the rear edge of the blade; and the web plate 8 is adhered to the high-pressure sheet, and structural glue is coated on the rear edge of the front edge and the web plate to adhere the high-pressure sheet and the low-pressure sheet together. The rear edge of the high-pressure sheet and the rear edge of the low-pressure sheet are integrally formed with the high-pressure sheet and the low-pressure sheet respectively, in the process of bonding the blade, the rear edge of the high-pressure sheet and the rear edge of the low-pressure sheet are bonded through structural adhesive, the problem of shape following performance exists between bonding surfaces of the two rear edges, the ideal bonding thickness is difficult to achieve, the bonding thickness is easy to exceed the standard, the bonding performance can be reduced, and meanwhile, the excessive bonding thickness easily causes more production defects such as bubbles, cavities and the like, and the structural reliability of the blade is influenced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a preparation method of a wind power blade.
The invention provides a preparation method of a wind power blade, which comprises the following steps:
1) sequentially laying upper glass fiber cloth, a suction side crossbeam, a sandwich and lower glass fiber cloth in a suction side shell mold, laying a vacuum system on a shell laying layer after the shell laying layer is finished, vacuum-pouring resin until the resin system is completely cured, and demolding to obtain an integrally formed object of the suction side shell and the suction side crossbeam; preparing an integrally formed product of the pressure side shell and the pressure side girder according to the method;
2) paving glass fiber cloth-core material-glass fiber cloth in sequence in a wind power blade prefabricated rear edge mold, pouring resin in vacuum after paving, curing and demolding to obtain a prefabricated rear edge, wherein the prefabricated rear edge is formed by integrally molding a suction side shell rear edge and a pressure side shell rear edge
The resulting part;
3) the two ends of the front edge web plate and the rear edge web plate are respectively bonded to the suction side girder and the pressure side girder, and the front edge parts of the suction side shell and the pressure side shell are bonded;
4) and (5) bonding the prefabricated rear edge with the suction side shell and the pressure side shell to obtain the wind power blade.
Preferably, the suction side girder, the pressure side girder, the leading edge web plate, the trailing edge web plate and the prefabricated trailing edge are all prepared by adopting a vacuum introduction molding process.
Preferably, the method for laying the vacuum system in the step 1) comprises the following steps: laying demolding cloth on the upper surface of the shell laying layer after shell laying is finished, laying an upper surface flow guide net and an upper surface air pumping bag on the upper surface of the demolding cloth, then laying a sealed vacuum bag film on the whole shell mold, arranging an adhesive injection port and a vacuum pumping port in a molding mold cavity, and vacuumizing to keep the vacuum degree less than or equal to-0.098 Mpa.
Preferably, the method for bonding the leading edge portions of the pressure side shell and the suction side shell in the step 2) comprises the following steps: structural adhesive is coated on a front edge bonding area of the suction side shell or the pressure side shell, and the front edge part of the pressure side shell is bonded with the front edge part of the suction side shell.
Preferably, the two ends of the front edge web and the rear edge web in the step 3) are provided with bonding flanges.
Preferably, the method for bonding the leading edge web plate and the trailing edge web plate with the girder in the step 3) comprises the following steps: structural glue is coated on the flanges of the front edge web plate and the rear edge web plate, and two ends of the front edge web plate and the rear edge web plate are respectively adhered to the suction side girder and the pressure side girder through the structural glue.
Preferably, the prefabricated rear edge in the step 4) is bonded with the suction side shell and the pressure side shell through structural adhesive, and the surfaces in contact with each other during bonding are planar.
The two ends of the front edge web plate and the rear edge web plate are bonded with the suction side girder on the integrally formed object of the suction side shell and the suction side girder through the structural adhesive and the pressure side girder on the integrally formed object of the pressure side shell and the pressure side girder.
The surfaces of the prefabricated rear edge, which are contacted with the suction side shell and the pressure side shell are planar, so that the bonding difficulty between the planes is greatly reduced and the quality can be ensured compared with an irregular cavity.
In the step 1) of the invention, the upper glass fiber cloth is laid close to the shell mold at the suction side/pressure side, and the lower glass fiber cloth is laid above the core material.
The preparation method of the prefabricated trailing edge comprises the following steps: laying glass fiber cloth and core materials in a prefabricated trailing edge mold, laying a flow guide net and a glue injection pipe material on the surface after laying, establishing a closed system by using a flexible film and a sealing adhesive tape, vacuumizing by using a vacuum pump to keep the vacuum degree less than or equal to-0.098 Mpa, introducing resin, dispersing the resin through the glue injection pipe and the flow guide net, completing the pouring of a product, heating, curing and molding, and demolding to obtain the prefabricated trailing edge.
The vacuum introduction molding process comprises the following steps: the technological principle is that a flexible vacuum bag film is used to cover and seal a reinforcing material preformed body on a single-sided rigid mould, the gas in a mould cavity is removed under vacuum negative pressure, the resin is used for impregnating fibers and fabrics thereof by utilizing the flowing and permeation of the resin, and the composite material member is obtained by curing and forming.
At present, in the production process of a wind power blade, a web plate and a girder are usually prepared firstly, then the web plate is bonded on the surface of a suction side shell or a pressure side shell by using structural adhesive, the front edge and the rear edge of the shell are integrally formed with the suction side shell and the pressure side shell, the front edge of the suction side shell is bonded with the front edge of the pressure side shell, the rear edge of the suction side shell is bonded with the rear edge of the pressure side shell, and finally the wind power blade is prepared. Because the shell of the wind power blade is an irregular curved surface, the rear edge of the wind power blade is an irregular cavity, the rear edge of the shell and the shell are integrally formed by adopting a traditional method, the paving operation is difficult, the problem of shape following of the bonding surface when the rear edge of the suction side shell and the rear edge of the pressure side shell are bonded exists, the shell is irregular and difficult to bond, the ideal bonding thickness is difficult to achieve, the bonding performance can be reduced, the defects of folds, glue deficiency and the like of the rear edge of the wind power blade are easily caused, and then the faults of rear edge cracking and the like in the operation process of the wind power blade are caused, so that the forming efficiency of the blade is influenced, the burden of after-sale service is increased, and the economic loss. In addition, the deviation of the actual bonding thickness in the bonding process causes that the adhesive consumption cannot be accurately predicted, and in order to ensure that the defect of adhesive shortage is not generated, the adhesive consumption needs to be amplified in the actual production, so that the material waste is caused.
According to the invention, the rear edge of the suction side shell and the rear edge of the pressure side shell are firstly manufactured into an integral prefabricated rear edge and then are bonded with the suction side shell and the pressure side shell, structural glue is not needed to be used for bonding between the rear edge of the suction side shell and the rear edge of the pressure side shell, various problems caused by irregular bonding surfaces of the suction side shell and the pressure side shell are avoided, and the prefabricated rear edge can be used for refining control points, so that the forming defects such as folds and the like are avoided to the greatest extent; and secondly, the bonding surface of the prefabricated rear edge and the shell is a plane, so that the bonding difficulty between the plane and the plane is greatly reduced and the quality can be ensured compared with an irregular cavity.
The wind power blade is divided into modules such as a prefabricated rear edge, a suction side shell, a pressure side shell, a web plate, a suction side girder, a pressure side girder and the like, and in the blade forming process, the modules are formed respectively and are finally adhered together through corresponding process means, so that the production efficiency can be improved, the rapid forming of the blade can be realized, the scrapping of the whole blade caused by the serious defect of a certain region of the blade can be avoided, the cost is reduced, the quality control can be performed on each module respectively, the operation flow is refined, the cost reduction and the efficiency improvement are realized while the product quality is ensured, and the effect is better.
The invention has the beneficial effects that:
1. the control item points can be refined by adopting the prefabricated rear edge, and the forming defects such as folds and the like are avoided to the maximum extent; and secondly, the bonding surface of the prefabricated rear edge and the shell is a plane, so that the bonding difficulty between the plane and the plane is greatly reduced and the quality can be ensured compared with an irregular cavity.
2. The wind power blade is divided into modules such as a prefabricated rear edge, a suction side shell, a pressure side shell, a web plate, a suction side girder, a pressure side girder and the like, and in the blade forming process, the modules are formed respectively and are finally adhered together through corresponding process means, so that the production efficiency can be improved, the rapid forming of the blade can be realized, the scrapping of the whole blade caused by the serious defect of a certain region of the blade can be avoided, the cost is reduced, the quality control can be performed on each module respectively, the operation flow is refined, the cost reduction and the efficiency improvement are realized while the product quality is ensured, and the effect is better.
3. The preparation method is simple, the production efficiency is high, and the material use cost and the like in the production process are reduced.
Drawings
FIG. 1 is a schematic structural diagram of a wind turbine blade according to the present invention.
FIG. 2 is an isometric view of a wind blade according to the present invention.
FIG. 3 is a top view of a wind blade of the present invention.
FIG. 4 is a schematic view of a prefabricated trailing edge structure of the wind turbine blade of the present invention.
FIG. 5 is a cross-sectional view of a prefabricated trailing edge mold of the present invention.
Wherein, 1 prefabricate the trailing edge, 2 suction side/pressure side casings, 3 suction side/pressure side girder, 4 leading edge/trailing edge web.
Detailed Description
The following examples are presented to further illustrate the embodiments of the present invention and are not intended to limit the invention thereto.
As shown in fig. 1-3, the wind power blade prepared by the invention comprises a prefabricated trailing edge 1, a suction edge/pressure edge shell 2, a leading edge/trailing edge web 3 and a suction edge/pressure edge girder 4, wherein the prefabricated trailing edge 1 is a part obtained by integrally molding the trailing edge of the suction edge shell and the trailing edge of the pressure edge shell.
The prefabricated trailing edge mold disclosed by the invention is shown in fig. 5, and the structure of the prefabricated trailing edge 1 obtained in the prefabricated trailing edge mold by adopting a vacuum introduction molding process is shown in fig. 4.
Example 1
1) Firstly, respectively preparing a suction side girder, a pressure side girder, a front edge web plate, a rear edge web plate and a prefabricated rear edge by adopting a vacuum introduction molding process, sequentially laying upper glass fiber cloth, the suction side girder, a sandwich and lower glass fiber cloth in a suction side shell mold, laying demolding cloth on the upper surface of a shell laying layer after shell laying is finished, laying an upper surface flow guide net and an upper surface air pumping bag on the upper surface of the demolding cloth, then laying a sealed vacuum bag film on the whole shell mold, arranging an adhesive injection port and a vacuum air pumping port in a molding mold cavity, and vacuumizing to keep the vacuum degree less than or equal to-0.098 Mpa; resin is poured in vacuum until the resin system is completely cured, and an integral molding object of the suction side shell and the suction side crossbeam is obtained after demolding; preparing an integrally formed product of the pressure side shell and the pressure side girder according to the method;
2) paving glass fiber cloth and a core material in a prefabricated trailing edge mold according to the sequence of the glass fiber cloth, the core material and the glass fiber cloth, paving a flow guide net and a glue injection pipe material on the surface after paving, establishing a closed system by using a flexible film and a sealing adhesive tape, vacuumizing by using a vacuum pump to keep the vacuum degree less than or equal to-0.098 Mpa, introducing resin, dispersing the resin through the glue injection pipe and the flow guide net, completing the injection of a product, heating, curing and molding, and demolding to obtain a prefabricated trailing edge, wherein the prefabricated trailing edge is a part obtained by integrally molding the trailing edge of a suction side shell and the trailing edge of a pressure side shell;
3) flanges for bonding are arranged at two ends of the front edge web plate and the rear edge web plate, structural glue is coated on the flanges, and two ends of the front edge web plate and the rear edge web plate are bonded to the suction side girder and the pressure side girder respectively through the structural glue; coating structural adhesive on the front edge bonding area of the suction side shell or the pressure side shell to bond the front edge part of the pressure side shell with the front edge part of the suction side shell;
4) and (3) bonding the prefabricated rear edge with the suction side shell and the pressure side shell through structural adhesive, wherein the surfaces in contact during bonding are planar, and finally obtaining the wind power blade.
Comparative example 1
The wind power blade is prepared by the method in the patent application number CN 201720866497.4.
Through research, the method in the embodiment 1 is adopted to integrally form the rear edge of the suction side shell and the rear edge of the pressure side shell into the prefabricated rear edge, the rear edge of the suction side shell and the rear edge of the pressure side shell do not need to be bonded in the later wind power blade modularization assembling and bonding process, but the prefabricated rear edge is directly bonded with the suction side shell and the pressure side shell, compared with the method in the comparative example 1, the method avoids the problems that the rear edge of the suction side shell and the rear edge of the pressure side shell are difficult to bond and have wrinkles, the prefabricated rear edge can refine control points, and the forming defects such as the wrinkles and the like are avoided to the greatest extent; and secondly, the bonding surface of the prefabricated rear edge and the shell is a plane, so that the bonding difficulty between the plane and the plane is greatly reduced and the quality can be ensured compared with an irregular cavity.
Claims (3)
1. The preparation method of the wind power blade is characterized by comprising the following steps:
1) sequentially laying upper glass fiber cloth, a suction side crossbeam, a sandwich and lower glass fiber cloth in a suction side shell mold, laying a vacuum system on a shell laying layer after the shell laying layer is finished, vacuum-pouring resin until the resin system is completely cured, and demolding to obtain an integrally formed object of the suction side shell and the suction side crossbeam; preparing an integrally formed product of the pressure side shell and the pressure side girder according to the method;
2) paving the glass fiber cloth, the core material and the glass fiber cloth in sequence in a wind power blade prefabricated rear edge mold, after paving, vacuum-infusing resin, curing and demolding to obtain a prefabricated rear edge; the prefabricated rear edge is a part obtained by integrally molding the rear edge of the suction side shell and the rear edge of the pressure side shell;
3) the two ends of the front edge web plate and the rear edge web plate are respectively bonded to the suction side girder and the pressure side girder, and the front edge parts of the suction side shell and the pressure side shell are bonded;
4) bonding the prefabricated rear edge with the suction side shell and the pressure side shell to obtain the wind power blade;
in step 3), the method for bonding the leading edge parts of the pressure side shell and the suction side shell comprises the following steps: structural adhesive is coated on a front edge bonding area of the suction side shell or the pressure side shell, and the front edge part of the pressure side shell is bonded with the front edge part of the suction side shell;
in the step 3), two ends of the front edge web plate and the rear edge web plate are provided with flanges for bonding;
in step 3), the method for bonding the leading edge web plate and the trailing edge web plate with the girder comprises the following steps: structural glue is coated on the flanges of the front edge web plate and the rear edge web plate, and two ends of the front edge web plate and the rear edge web plate are respectively adhered to the suction side girder and the pressure side girder through the structural glue;
in the step 4), the prefabricated rear edge is bonded with the suction side shell and the pressure side shell through structural adhesive, and the surfaces in contact with each other during bonding are all planar.
2. The method according to claim 1, wherein the suction side member, the pressure side member, the leading edge web, the trailing edge web and the prefabricated trailing edge are all manufactured by a vacuum injection molding process.
3. The method for preparing the wind power blade according to claim 1, wherein in the step 1), the method for laying the vacuum system comprises the following steps: laying demolding cloth on the upper surface of the shell laying layer after shell laying is finished, laying an upper surface flow guide net and an upper surface air pumping bag on the upper surface of the demolding cloth, then laying a sealed vacuum bag film on the whole shell mold, arranging an adhesive injection port and a vacuum pumping port in a molding mold cavity, and vacuumizing to keep the vacuum degree less than or equal to-0.098 Mpa.
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| CN201811239362.0A CN109109341B (en) | 2018-10-23 | 2018-10-23 | Preparation method of wind power blade |
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| CN201811239362.0A CN109109341B (en) | 2018-10-23 | 2018-10-23 | Preparation method of wind power blade |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110645142B (en) * | 2019-09-27 | 2023-09-22 | 明阳智慧能源集团股份公司 | Modularized wind power blade not scrapped in full life cycle and manufacturing method thereof |
| CN111070729B (en) * | 2019-11-12 | 2021-10-01 | 洛阳双瑞风电叶片有限公司 | Manufacturing method for reverse modeling of wind power blade web mold |
| CN111136939A (en) * | 2020-01-17 | 2020-05-12 | 无锡太湖学院 | Prefabricated tail edge beam structure of large wind turbine blade and manufacturing method |
| CN113232321A (en) * | 2021-03-29 | 2021-08-10 | 上海电气风电集团股份有限公司 | Wind power blade shell core material prefabricating process method and shell core material prefabricating member |
| CN115583041B (en) * | 2022-12-09 | 2023-03-14 | 成都市鸿侠科技有限责任公司 | Special-shaped complex curved surface gluing tool and gluing method |
| CN117390721B (en) * | 2023-12-11 | 2024-04-16 | 东方电气（天津）风电叶片工程有限公司 | Method for generating trailing edge blind core-sticking material model |
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Effective date of registration: 20240119 Address after: 412007 Haitian Road, Tianyuan District, Zhuzhou, Hunan Province, No. 18 Patentee after: ZHUZHOU TIMES NEW MATERIAL TECHNOLOGY Co.,Ltd. Patentee after: National University of Defense Technology Address before: 412007 Haitian Road, Tianyuan District, Zhuzhou, Hunan Province, No. 18 Patentee before: ZHUZHOU TIMES NEW MATERIAL TECHNOLOGY Co.,Ltd. |