CN108284621A - The inside and outside reinforcement of fan blade of wind generating set overlays perfusion preparation method - Google Patents
The inside and outside reinforcement of fan blade of wind generating set overlays perfusion preparation method Download PDFInfo
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- CN108284621A CN108284621A CN201810076726.1A CN201810076726A CN108284621A CN 108284621 A CN108284621 A CN 108284621A CN 201810076726 A CN201810076726 A CN 201810076726A CN 108284621 A CN108284621 A CN 108284621A
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- Prior art keywords
- fiber cloth
- reinforcement
- vacuum
- reinforcing fiber
- generating set
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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
- 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
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
-
- 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
Perfusion preparation method is overlay the invention discloses a kind of inside and outside reinforcement of fan blade of wind generating set, and the present invention includes that interior reinforcement overlays perfusion preparation method and outer reinforcement overlays perfusion preparation method.The present invention is by inside and outside reinforcement and shell one form, so that the inside and outside reinforcement adhesive property of blade is more preferable, inside and outside reinforced surface is more smooth, it is substantially improved with type, blade monolithic devices face effect can be greatly promoted, heated by flexible heater mold after inside and outside reinforcement priming by vacuum, inside and outside reinforcement producing efficiency can be greatly improved, the solidification quality for ensureing inside and outside reinforcement, is finally reached the purpose of lean production, achieves extraordinary technique effect compared with prior art.
Description
Technical field
The invention patent relates to a kind of preparation methods of fan blade of wind generating set structure, and in particular to a kind of wind-force
The inside and outside reinforcement of generating set wind wheel blade overlays perfusion preparation method.
Background technology
At present in blade manufacturing process, the inside and outside reinforcement of shell generally uses hand paste evacuation process or priming by vacuum work
It is prepared by skill.Hand pastes evacuation process the defects of there are the inside and outside reinforcement of product to whiten, burr is more, fold;Vacuum perfusion process exists
The defects of impression, the fold that auxiliary material is left is perfused.It is required for curing after carrying out after two kinds of perfusions, rear solidification is generally using electricity
The ancillary equipments such as hot blanket, heat lamp, the control of such curing mode inconvenience solidification temperature, and also the efficiency of heating surface is very low, and it is whole
The time that a operational sequence expends is also longer, and production efficiency is relatively low.
Invention content
Goal of the invention:It, can It is an object of the present invention to solve the deficiency of the existing technology and provide a kind of technological design is reasonable
Strong operability can be improved inside and outside reinforced surface flatness and with type degree, the inside and outside reinforcement curing efficiency of blade can be improved, can be improved
The production efficiency of entire process is conducive to improve interior reinforcement local product quality and reduces the wind-force of outer reinforcement region putty dosage
The inside and outside reinforcement of generating set wind wheel blade overlays perfusion preparation method.
Technical solution:In order to achieve the object of the present invention, the technical solution adopted by the present invention is:
Reinforcement overlays perfusion preparation method in a kind of fan blade of wind generating set, includes the following steps:
A, vacuum film, flexible heater mold, continuous felt and interior reinforcing fiber on the inside of being first laid with successively in rigid die
Cloth;Then the first sealing joint strip is pasted at the edge of rigid die, outer vacuum film is then laid on interior reinforcing fiber cloth, and
Outer vacuum film and the first sealing joint strip are bonded and realize sealing;
B, continuous felt is connected with helix tube and is used as vacuum-pumping system, interior reinforcing fiber cloth is vacuumized into compacting;
C, after vacuum qualification, whole system is docked with blade front and rear edge, outer vacuum film is taken out after docking, makes interior benefit
Strong fiber cloth and blade front and rear edge are sturdy;
D, continuous felt is connected with injected rubber hose;Then by the second sealing joint strip and interior vacuum film by flexible die, even
Continuous felt and interior reinforcing fiber cloth are sealed with blade shell, as priming by vacuum flow guide system, are then filled by the technique vacuumized
Injection forming is that resin is perfused in interior reinforcing fiber cloth by injected rubber hose after vacuum pressurize qualification;
E, it after perfusion, is heated for interior reinforcing fiber cloth using flexible heater mold, curing molding;
F, after curing molding, the second sealing joint strip of dismantling, outer vacuum film, flexible die and continuous felt, both.
Preferably, reinforcement overlays perfusion preparation side in a kind of above-described fan blade of wind generating set
Method, which is characterized in that the flexible heater mold is the flexible die that carbon fiber makes.The present invention uses flexible heater mould
Tool, is designed according to blade front and rear edge shape, ensures with the shape, to coordinate temperature control system, have heating heating function, can carry significantly
High outer reinforced surface flatness and with type degree, reinforcement curing efficiency in raising blade!
Preferably, reinforcement overlays perfusion preparation side in a kind of above-described fan blade of wind generating set
Method, which is characterized in that the flexible heater mould heating-up temperature can be adjusted by switch board, set heating temperature as
60℃.It can ensure the uniform curing molding of resin.
Preferably, reinforcement overlays perfusion preparation side in a kind of above-described fan blade of wind generating set
Method, which is characterized in that the pressure after step D is vacuumized is -00.98MPa, it is ensured that the perfusion of resin is uniform, is covered in entire
Reinforcing fiber cloth improves pouring quality.
Preferably, reinforcement overlays perfusion preparation side in a kind of above-described fan blade of wind generating set
Method, the resin are epoxy resin etc..The interior reinforcing fiber cloth is glass fabric, basalt fiber cloth, carbon fiber
Cloth etc..
The present invention carries out priming by vacuum using continuous felt collocation helix tube and injected rubber hose, designs new diversion mode.In this way
Diversion mode advantage be perfused after surfacing, it is smooth.
A kind of outer reinforcement of fan blade of wind generating set overlays perfusion preparation method, includes the following steps:
D, vacuum film, flexible heater mold, continuous felt and outer reinforcing fiber on the outside of being first laid with successively in rigid die
Cloth;Then the first sealing joint strip is pasted at the edge of rigid die, interior vacuum film is then laid on outer reinforcing fiber cloth, and
Interior vacuum film and the first sealing joint strip are bonded and realize sealing;
E, continuous felt is connected with helix tube and is used as vacuum-pumping system, outer reinforcing fiber cloth is vacuumized into compacting;
F, after vacuum qualification, whole system is docked with blade front and rear edge, interior vacuum film is taken out after docking, makes outer benefit
Strong fiber cloth and blade front and rear edge are sturdy;
D, continuous felt is connected with injected rubber hose;Then by the second sealing joint strip and outer vacuum film by flexible die, even
Continuous felt and outer reinforcing fiber cloth are sealed with blade shell, as priming by vacuum flow guide system, are then filled by the technique vacuumized
Injection forming is that resin is perfused in outer reinforcing fiber cloth by injected rubber hose after vacuum pressurize qualification;
E, it after perfusion, is heated for outer reinforcing fiber cloth using flexible heater mold, curing molding;
F, after curing molding, the second sealing joint strip of dismantling, outer vacuum film, flexible die and continuous felt, both.
Preferably, the outer reinforcement of above-described a kind of fan blade of wind generating set overlays perfusion preparation side
Method, which is characterized in that the flexible heater mold is the flexible die that carbon fiber makes.The present invention uses flexible heater mould
Tool, is designed according to blade front and rear edge shape, ensures with the shape, to coordinate temperature control system, have heating heating function, can carry significantly
High outer reinforced surface flatness and with type degree, improves blade reinforcement curing efficiency outside!
Preferably, the outer reinforcement of above-described a kind of fan blade of wind generating set overlays perfusion preparation side
Method, which is characterized in that the flexible heater mould heating-up temperature can be adjusted by switch board, set heating temperature as
60℃.It can ensure the uniform curing molding of resin.
Preferably, the outer reinforcement of above-described a kind of fan blade of wind generating set overlays perfusion preparation side
Method, which is characterized in that the pressure after step D is vacuumized is -00.98MPa.It can guarantee that the perfusion of resin is uniform, be covered in entire
Reinforcing fiber cloth improves pouring quality.
Preferably, the outer reinforcement of above-described a kind of fan blade of wind generating set overlays perfusion preparation side
Method, the resin are epoxy resin etc..The outer reinforcing fiber cloth is glass fabric, basalt fiber cloth, carbon fiber
Cloth etc..
The present invention carries out priming by vacuum using continuous felt collocation helix tube and injected rubber hose, designs new diversion mode.In this way
Diversion mode advantage be perfused after surfacing, it is smooth.
The inside and outside reinforcement of fan blade of wind generating set of the present invention overlays perfusion preparation method, by inside and outside reinforcement
With shell form, the inside and outside reinforcement adhesive property of blade will be made more preferable, inside and outside reinforced surface is more smooth, big with type
Width is promoted, and can greatly promote blade monolithic devices face effect.It is heated by flexible heater mold after inside and outside reinforcement priming by vacuum, it can
To greatly improve inside and outside reinforcement producing efficiency, ensures the solidification quality of inside and outside reinforcement, be finally reached the purpose of lean production, phase
Extraordinary technique effect is achieved than the prior art.
Advantageous effect:The inside and outside reinforcement of a kind of fan blade of wind generating set provided by the invention overlays perfusion preparation side
Compared to the prior art method has the following advantages:
Preparation method provided by the invention, technological design is reasonable, and operability is strong, and the present invention uses vacuum infusion molding work
Skill is conducive to provide the adhesive strength of inside and outside reinforcement, and flexible heater mold is used to provide solidification institute for inside and outside reinforcing fiber cloth
The temperature needed, it can be ensured that inside and outside reinforcement, which reaches, to be fully cured;Flexible heater mold can provide inside and outside reinforced surface light
Slippery, to reduce outer surface putty dosage, highly practical, high financial profit.
Description of the drawings
Fig. 1 is that reinforcement overlays perfusion preparation method and prepared in a kind of fan blade of wind generating set provided by the invention
The advance laying schematic diagram of journey.
Fig. 2 is that reinforcement overlays perfusion preparation method and prepared in a kind of fan blade of wind generating set provided by the invention
The structural schematic diagram of journey.
Fig. 3 is prepared by a kind of outer reinforcement priming by vacuum preparation method of fan blade of wind generating set provided by the invention
The advance laying schematic diagram of journey.
Fig. 4 is prepared by a kind of outer reinforcement priming by vacuum preparation method of fan blade of wind generating set provided by the invention
The structural schematic diagram of journey.
Specific implementation mode
In the following with reference to the drawings and specific embodiments, the present invention is furture elucidated, it should be understood that these embodiments are merely to illustrate
It the present invention rather than limits the scope of the invention, after having read the present invention, those skilled in the art are to of the invention each
The modification of kind equivalent form falls within the application range as defined in the appended claims.
Embodiment 1
As depicted in figs. 1 and 2, reinforcement overlays perfusion preparation method in a kind of fan blade of wind generating set, including with
Lower step:
A, vacuum film 2 on the inside of being first laid with successively in 7 protrusion of rigid die, flexible heater mold 5, continuous felt 4 and outer
Reinforcing fiber cloth 3;Then the first sealing joint strip 1 is pasted at the edge of rigid die 7, then outside outer 3 upper berth of reinforcing fiber cloth
Vacuum film 6, and outer vacuum film 6 and the first sealing joint strip 1 are bonded and realize sealing;
B, continuous felt 4 is connected with helix tube 8 and is used as vacuum-pumping system, interior reinforcing fiber cloth 3 is vacuumized into compacting;
C, after vacuum qualification, whole system is docked with blade inlet edge 11, interior vacuum film 2 is taken out after docking, made outer
Reinforcing fiber cloth 3 and blade inlet edge 11 are sturdy;
D, continuous felt 4 is connected with injected rubber hose 9;Then by the second sealing joint strip 10 and outer vacuum film 6 by flexible die
Tool 5, continuous felt 4 and outer reinforcing fiber cloth 3 are sealed with blade shell, as priming by vacuum flow guide system, then by vacuumizing
Technique form be the filling of outer reinforcing fiber cloth 3 by injected rubber hose 9 after vacuum pressurize (pressure be -00.98MPa) is qualified
Note resin;
E, it is that outer reinforcing fiber cloth 3 is heated to 60 DEG C using flexible heater mold 5 after perfusion, curing molding;
F, after curing molding, dismantle the second sealing joint strip 10, outer vacuum film 6, flexible die 5 and continuous felt 4 etc.,
Both.
Embodiment 2
As shown in Figure 3 and Figure 4, the outer reinforcement priming by vacuum preparation method of a kind of fan blade of wind generating set, including with
Lower step:
A, vacuum film 6 on the outside of being first laid with successively in 7 groove of rigid die, flexible heater mold 5, continuous felt 4 and outer
Reinforcing fiber cloth 3;Then the first sealing joint strip 1 is pasted at the edge of rigid die 7, is then laid on outer reinforcing fiber cloth 3
Interior vacuum film 2, and interior vacuum film 2 and the first sealing joint strip 1 are bonded and realize sealing;
B, continuous felt 4 is connected with helix tube 8 and is used as vacuum-pumping system, outer reinforcing fiber cloth 3 is vacuumized into compacting;
C, after vacuum qualification, whole system is docked with blade inlet edge 11, outer vacuum film 6 is taken out after docking, made interior
Reinforcing fiber cloth 3 and blade inlet edge 11 are sturdy;
D, continuous felt 4 is connected with injected rubber hose 9;Then by the second sealing joint strip 10 and interior vacuum film 2 by flexible die
Tool 5, continuous felt 4 and outer reinforcing fiber cloth 3 are sealed with blade shell, as priming by vacuum flow guide system, then by vacuumizing
Technique form be the filling of interior reinforcing fiber cloth 3 by injected rubber hose 9 after vacuum pressurize (pressure be -00.98MPa) is qualified
Note resin;
E, it is that outer reinforcing fiber cloth 3 is heated to 60 DEG C using flexible heater mold 5 after perfusion, curing molding;
F, after curing molding, dismantle the second sealing joint strip 10, interior vacuum film 2, flexible die 5 and continuous felt 4 etc.,
Both.
Reinforcement overlays perfusion preparation method in a kind of above-described fan blade of wind generating set, and the flexibility adds
Mold heat 5 is the mold that carbon fiber makes.
Reinforcement overlays perfusion preparation method in fan blade of wind generating set provided by the invention, is advantageously implemented blade
Lean production, outer reinforcement manufacturing process defect can be greatly reduced, the inside and outside reinforcement of wind electricity blade front and rear edge being prepared, outside
Surface is smooth, can reduce outer reinforcement repairing type putty dosage, provide paint adhesion, achieve good technique effect.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (8)
1. reinforcement priming by vacuum preparation method in a kind of fan blade of wind generating set, which is characterized in that include the following steps:
A, inside vacuum film (2), flexible heater mold (5), continuous felt (4) and interior are first laid with successively in rigid die (7)
Reinforcing fiber cloth (3);Then the first sealing joint strip (1) is pasted at the edge of rigid die (7), then in interior reinforcing fiber cloth
(3) it is laid with outer vacuum film (6) on, and outer vacuum film (6) and the first sealing joint strip (1) are bonded and realize sealing;
B, continuous felt (4) is connected with helix tube (8) and is used as vacuum-pumping system, interior reinforcing fiber cloth (3) is vacuumized into compacting;
C, after vacuum qualification, whole system is docked with blade front and rear edge, outer vacuum film (6) is taken out after docking, makes interior benefit
Strong fiber cloth (3) and blade front and rear edge are sturdy;
D, continuous felt (4) is connected with injected rubber hose (9);It then will be soft by the second sealing joint strip (10) and interior vacuum film (2)
Property mold (5), continuous felt (4) and outer reinforcing fiber cloth (3) sealed with blade shell, as priming by vacuum flow guide system, then
By the technique form vacuumized, after vacuum pressurize qualification, it is perfused for interior reinforcing fiber cloth (3) by injected rubber hose (9)
Resin;
E, it after perfusion, is heated for interior reinforcing fiber cloth (3) using flexible heater mold (5), curing molding;
F, after curing molding, the second sealing joint strip (10) of dismantling, interior vacuum film (2), flexible die (5) and continuous felt
(4), both.
2. reinforcement overlays perfusion preparation method in a kind of fan blade of wind generating set according to claim 1, special
Sign is that the flexible heater mold (5) is the flexible die that carbon fiber makes.
3. reinforcement overlays perfusion preparation method in a kind of fan blade of wind generating set according to claim 1, special
Sign is that described flexible heater mold (5) heating temperature is that can be adjusted by switch board, sets heating temperature as 60
℃。
4. reinforcement overlays perfusion preparation method in a kind of fan blade of wind generating set according to claim 1, special
Sign is that the pressure after step D is vacuumized is -00.98MPa.
5. a kind of outer reinforcement of fan blade of wind generating set overlays perfusion preparation method, which is characterized in that include the following steps:
A, first in rigid die (7) successively be laid with outside vacuum film (6), flexible heater mold (5), continuous felt (4) and outside
Reinforcing fiber cloth (3);Then the first sealing joint strip (1) is pasted at the edge of rigid die (7), then in outer reinforcing fiber cloth
(3) vacuum film (2) in being laid on, and interior vacuum film (2) and the first sealing joint strip (1) are bonded and realize sealing;
B, continuous felt (4) is connected with helix tube (8) and is used as vacuum-pumping system, outer reinforcing fiber cloth (3) is vacuumized into compacting;
C, after vacuum qualification, whole system is docked with blade front and rear edge, interior vacuum film (2) is taken out after docking, makes outer benefit
Strong fiber cloth (3) and blade front and rear edge are sturdy;
D, continuous felt (4) is connected with injected rubber hose (9);It then will be soft by the second sealing joint strip (10) and outer vacuum film (6)
Property mold (5), continuous felt (4) and outer reinforcing fiber cloth (3) sealed with blade shell, as priming by vacuum flow guide system, then
By the technique form vacuumized, after vacuum pressurize qualification, it is perfused for outer reinforcing fiber cloth (3) by injected rubber hose (9)
Resin;
E, it after perfusion, is heated for outer reinforcing fiber cloth (3) using flexible heater mold (5), curing molding;
F, after curing molding, the second sealing joint strip (10) of dismantling, outer vacuum film (6), flexible die (5) and continuous felt
(4), both.
6. a kind of outer reinforcement of fan blade of wind generating set according to claim 5 overlays perfusion preparation method, special
Sign is that step A flexible heaters mold (5) is the flexible die that carbon fiber makes.
7. a kind of outer reinforcement of fan blade of wind generating set according to claim 5 overlays perfusion preparation method, special
Sign is that flexible heater mold (5) heating temperature is that can be adjusted by switch board, sets heating temperature as 60 DEG C.
8. a kind of outer reinforcement of fan blade of wind generating set according to claim 5 overlays perfusion preparation method, special
Sign is that the pressure after step D is vacuumized is -00.98MPa.
Priority Applications (1)
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CN201810076726.1A CN108284621A (en) | 2018-01-26 | 2018-01-26 | The inside and outside reinforcement of fan blade of wind generating set overlays perfusion preparation method |
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CN201810076726.1A CN108284621A (en) | 2018-01-26 | 2018-01-26 | The inside and outside reinforcement of fan blade of wind generating set overlays perfusion preparation method |
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CN201810076726.1A Withdrawn CN108284621A (en) | 2018-01-26 | 2018-01-26 | The inside and outside reinforcement of fan blade of wind generating set overlays perfusion preparation method |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109291468A (en) * | 2018-12-06 | 2019-02-01 | 国电联合动力技术有限公司 | Low wind speed wind electricity blade local strengthening method reinforces precast body and Wind turbines |
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Publication number | Priority date | Publication date | Assignee | Title |
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CN104476780A (en) * | 2014-12-19 | 2015-04-01 | 连云港中复连众复合材料集团有限公司 | Vacuum infusion and flow guide system and infusion and flow guide method for reinforcing plate of wind turbine blade |
CN105283303A (en) * | 2013-04-17 | 2016-01-27 | Lmwp专利控股有限公司 | A wind turbine blade repair method |
CN109986802A (en) * | 2017-12-29 | 2019-07-09 | 北京金风科创风电设备有限公司 | Wind generating set blade internal reinforcement preparation method and wind generating set blade |
CN109986806A (en) * | 2017-12-29 | 2019-07-09 | 北京金风科创风电设备有限公司 | Wind generating set blade outer reinforcement manufacturing method and wind generating set blade |
-
2018
- 2018-01-26 CN CN201810076726.1A patent/CN108284621A/en not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105283303A (en) * | 2013-04-17 | 2016-01-27 | Lmwp专利控股有限公司 | A wind turbine blade repair method |
CN104476780A (en) * | 2014-12-19 | 2015-04-01 | 连云港中复连众复合材料集团有限公司 | Vacuum infusion and flow guide system and infusion and flow guide method for reinforcing plate of wind turbine blade |
CN109986802A (en) * | 2017-12-29 | 2019-07-09 | 北京金风科创风电设备有限公司 | Wind generating set blade internal reinforcement preparation method and wind generating set blade |
CN109986806A (en) * | 2017-12-29 | 2019-07-09 | 北京金风科创风电设备有限公司 | Wind generating set blade outer reinforcement manufacturing method and wind generating set blade |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109291468A (en) * | 2018-12-06 | 2019-02-01 | 国电联合动力技术有限公司 | Low wind speed wind electricity blade local strengthening method reinforces precast body and Wind turbines |
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CB02 | Change of applicant information |
Address after: 222069 Jinqiao Road, Dapu Industrial Zone, Lianyungang, Jiangsu 6 Applicant after: Lianyungang Zhongfulianzhong Composite Material Group Corp., Ltd. Address before: No. 195, Hai Lian Dong Road, Lianyungang, Jiangsu Province Applicant before: Lianyungang Zhongfulianzhong Composite Material Group Corp., Ltd. |
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Application publication date: 20180717 |
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