CN107199715B - A kind of pre-buried blade root method for filling of bolt sleeve - Google Patents
A kind of pre-buried blade root method for filling of bolt sleeve Download PDFInfo
- Publication number
- CN107199715B CN107199715B CN201610147173.5A CN201610147173A CN107199715B CN 107199715 B CN107199715 B CN 107199715B CN 201610147173 A CN201610147173 A CN 201610147173A CN 107199715 B CN107199715 B CN 107199715B
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- flow
- guiding screen
- built
- fitting
- laid
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Classifications
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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
- B29C70/04—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
- 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
- B29C70/543—Fixing the position or configuration of fibrous reinforcements before or during moulding
-
- 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
Abstract
The invention discloses a kind of pre-buried blade root method for filling of bolt sleeve, include the steps that preparing die cavity；It is laid with lower glass, continuous felt is laid with, is laid with built-in fitting, the upper glass of layings, is laid with flow-guiding screen, arrangement injected rubber hose, placement air-exhausting bag, glue is perfused.Continuous felt is placed below in built-in fitting bottom, is laid with flow-guiding screen one and injected rubber hose above built-in fitting and upper glass-fiber-fabric；One 0~300mm of start point distance built-in fitting starting point of flow-guiding screen；One circumferencial direction of flow-guiding screen is divided into 3 sections: rear flow-guiding screen, middle section flow-guiding screen, leading edge flow-guiding screen open up the resin deceleration strip that width is 30~150mm between rear flow-guiding screen, middle section flow-guiding screen, leading edge flow-guiding screen；Injected rubber hose is arranged along built-in fitting length direction.Blade root and leading edge, rear above flow-guiding screen one place air-exhausting bag.Present invention efficiently solves the problems for leading to pre-buried blade root region resin cavity because of resin flow rate unevenness, further enhance blade root fastenings intensity.
Description
Technical field
The present invention relates to technical field of wind turbine generator blade manufacture, especially a kind of root of large-scale composite material blade
It is pre-buried
Part method for filling.
Background technique
Wind power generation blade at present generallys use vacuum assisted molding moulding process in the production process.I.e. system is one
Under conditions of fixed negative pressure, glue is injected into reinforcing material by the external world, then curing molding.Wherein glue is must be into before
Row deaeration processing, removes bubble extra in removing glue liquid, guarantees the resin content and production quality of product, improve the intensity of blade.
With the increase of blade diameter, length and weight, bonding strength needed for root of blade connection increases therewith, mostly uses at present pre-
The mode of burying increases the radical of root connection bolt, to increase the bonding strength of blade；But built-in fitting is that solid can not carry out
The water conservancy diversion of resin, and it is located at the difficulty that perfusion is increased among glass layer of cloth.Upper most widely used reperfusion mode is produced at present
For in the circumferentially disposed single tube in built-in fitting end, the reperfusion mode because circumferencial direction single tube is perfused, set between gap by built-in fitting
Rouge flowing velocity is apparently higher than glass-fiber-fabric percolation flow velocity, and packet stream easy to form leads to the reperfusion mode that resin is empty, and minority uses
For the spanwise arrangement single tube on built-in fitting, but flow region is longer, and bottom and facial flow velocity are inconsistent, equally also will form packet stream
Cause resin empty；And resin flowing in built-in fitting region is uneven, bubble, which is difficult to extract out, after the closure of gap is easy to appear built-in fitting
Resin cavity blemish, two kinds of defects greatly reduce the bonding strength of blade root built-in fitting.
Vacuum perfusion process refers to system under conditions of certain negative pressure, and glue is injected into reinforcing material by the external world,
Then curing molding.Bolt sleeve is pre-buried to be referred to one of blade root fastenings part bolt sleeve (internal screw thread) in blade shell laying process
It overlays, with shell glass-fiber-fabric, form, the technique enhance blade with host bonding strength together.
In the prior art, the application for a patent for invention of Publication No. CN105058816A discloses a kind of wind electricity blade vacuum filling
Note pumping setting, including be arranged at wind electricity blade flange ventilative cotton, being wrapped up on the ventilative cotton with flow-guiding screen is set
Winding pipe and the vacuum port that is arranged on the wind electricity blade, wherein successively covering VAP semi-permeable membrane, thoroughly at the vacuum port
Gas cotton and flow-guiding screen three-decker；The three-decker is connected to mold bleeding point.The invention of Publication No. CN104015375A
Patent application discloses a kind of big thickness area composite product pouring and molding method, passes through the extension supporting in moulding process
Platform and isolation board, the contact between separation injected rubber hose and composite material enhancing fabric laying, reduce resin in filling process
The flow velocity at initial stage enters enhancing fabric to avoid resin " impact type ", makes have sufficient leaching between resin and enhancing fabric
Moisten the time, to reduce non-wetting and happen containing glue is insufficient.In composite material enhancing fabric laying surface laying point
It dissipates the stronger permeable medium of property and forms the bubble being dispersed to precipitate in the collectable resin of peeling layer by support platform and isolation board, and
So that bubble is further become smaller, be easily pumped, and achievees the purpose that solve product perfusion blush defect.
Summary of the invention
The technical problem to be solved by the invention is to provide a kind of pre-buried blade root method for filling of bolt sleeve, can solve
Certainly because resin flow rate unevenness leads to pre-buried blade root region resin cavity problem, blade root fastenings intensity is enhanced.
The technical scheme is that a kind of pre-buried blade root method for filling of bolt sleeve, includes the following steps: to prepare mould
The step of chamber；The step of being laid with lower glass-fiber-fabric；The step of being laid with continuous felt；The step of being laid with built-in fitting；Glass-fiber-fabric in laying
Step；The step of being laid with flow-guiding screen；The step of arranging injected rubber hose；The step of placing air-exhausting bag；The step of glue is perfused.
Continuous felt is placed below in built-in fitting bottom, is laid with flow-guiding screen one and injected rubber hose above built-in fitting and upper glass-fiber-fabric；
Flow-guiding screen one start point distance built-in fitting 0~300mm of starting point, one 1.5~2m of length of flow-guiding screen；One circumferencial direction of flow-guiding screen is divided into 3 sections:
Rear flow-guiding screen, middle section flow-guiding screen, leading edge flow-guiding screen；Width is opened up between the rear flow-guiding screen, middle section flow-guiding screen, leading edge flow-guiding screen
Degree is the resin deceleration strip of 30~150mm；Injected rubber hose is arranged along built-in fitting length direction；Injected rubber hose is apart from one fringe tree of flow-guiding screen
Rouge 0~300mm of deceleration strip, the distance apart from one beginning and end of flow-guiding screen are 0~100mm.
Blade root and leading edge, rear above flow-guiding screen one place air-exhausting bag.
One 160~250g/ of grammes per square metre ㎡ of built-in fitting and flow-guiding screen.
Air-exhausting bag includes macromolecule one-way ventilating film, flow-guiding screen two, bag film and sealant tape, macromolecule one-way ventilating film and
By sealant tape sealing margin, flow-guiding screen two is placed among macromolecule one-way ventilating film and bag film bag film；It is opened up on air-exhausting bag
Observation window.
It is lower glass-fiber-fabric below continuous felt；In filling process, upper glass-fiber-fabric is permeated using one water conservancy diversion of flow-guiding screen, lower glass
Cloth uses continuous felt water conservancy diversion.
The present invention is in filling process, and because injected rubber hose is arranged along built-in fitting length direction, flow-guiding screen covers entire built-in fitting
Installation region, and circumferencial direction is divided into 3 sections, and the resin deceleration strip that width is 30~150mm is opened up between 3 sections of flow-guiding screens；Therefore it sets
Rouge can integrally cover built-in fitting, synchronous filling built-in fitting gap；Because being equipped with resin deceleration strip, resin can reduce forward's stream here
Dynamic speed increases the seepage flow of resin downwards, glass-fiber-fabric below full penetration built-in fitting.Observation window is opened up on air-exhausting bag, can be protected
The case where demonstrate,proving the flow locations of effective observation resin, and being full of observation window according to resin determines the opportunity for switching injected rubber hose,
The effective infiltration for guaranteeing built-in fitting top and bottom glass-fiber-fabric avoids packet stream from forming resin cavity.Air-exhausting bag observation window is full of in resin
Shi Yici opens remaining injected rubber hose and is impregnated with built-in fitting and glass-fiber-fabric；And because of the effect of air-exhausting bag above built-in fitting, can sufficiently will
Resin bubble discharge between built-in fitting.Present invention efficiently solves lead to pre-buried blade root region tree because of resin flow rate unevenness
The problem in rouge cavity, further enhances blade root fastenings intensity.The present invention uses extensively in terms of built-in fitting perfusion, different straight
It can be used on diameter and the pre-buried type blade of different model.
Detailed description of the invention
Fig. 1 is the perfusion system and method for filling schematic diagram of the embodiment of the present invention；
Fig. 2 is the air-exhausting bag and schematic diagram of manufacturing method of the embodiment of the present invention；
Fig. 3 is the perfusion system runner arrangement schematic diagram of the embodiment of the present invention；
Wherein: 101-lower glass-fiber-fabrics, 102-continuous felts, 103-built-in fittings, 104-upper glass-fiber-fabrics, 105-flow-guiding screens
One, 106-air-exhausting bags, 107-injected rubber hoses, 201-macromolecule one-way ventilating films, 202-sealant tapes, 203-flow-guiding screens two,
204-bag films, 301-rear flow-guiding screens, 302-middle section flow-guiding screens, 303-leading edge flow-guiding screens, 304-injected rubber hoses, 305-trees
Rouge deceleration strip.
Specific embodiment
The present invention is illustrated with reference to the accompanying drawing.
Referring to FIG. 1, perfusion system and method for filling.Entire perfusion system is mainly by lower glass-fiber-fabric 101, continuous felt
102, built-in fitting 103, upper glass-fiber-fabric 104, flow-guiding screen 1, air-exhausting bag 106, injected rubber hose 107 form.Upper glass-fiber-fabric and lower glass
Fine cloth is located at the upper surface of built-in fitting and following.Continuous felt is placed between built-in fitting and lower glass-fiber-fabric, built-in fitting and upper glass
Flow-guiding screen one and injected rubber hose are laid with above fine cloth.Air-exhausting bag is placed on above flow-guiding screen one.In filling process above built-in fitting
Upper glass-fiber-fabric permeated using one water conservancy diversion of flow-guiding screen, the lower glass-fiber-fabric below built-in fitting uses 102 water conservancy diversion of continuous felt.
Referring to FIG. 2, air-exhausting bag 106 and preparation method thereof.Blade root and front and rear edges place air-exhausting bag 106 above runner, take out
Observation window is provided on airbag 106.Air-exhausting bag 106 is mainly by macromolecule one-way ventilating film 201, flow-guiding screen 2 203,204 He of bag film
Sealant tape 202 forms, and by 202 sealing margin of sealant tape, flow-guiding screen 2 203 is put for macromolecule one-way ventilating film 201 and bag film
It sets among macromolecule one-way ventilating film 201 and bag film 204.
Flow-guiding screen two plays the role of air guide in air-exhausting bag, and macromolecule one-way ventilating film is only breathed freely not seep through；Because leading
Drift net two is sealed among macromolecule one-way ventilating film and bag film, can only take the bubble in resin away in pumping process, and
Resin will not be taken away.
Because air-exhausting bag is opaque, the flowing of resin can not be observed；Observation window is opened up on air-exhausting bag, it is ensured that effective observation
The flow locations of resin, and can according to resin be full of observation window the case where determine switch injected rubber hose opportunity, guarantee built-in fitting on,
Effective infiltration of glass-fiber-fabric below avoids packet stream from forming resin cavity.
Referring to FIG. 3, describing the method for arranging of the runner of perfusion system of the invention.It is 3 sections that flow-guiding screen one, which divides: rear
Flow-guiding screen 301, middle section flow-guiding screen 302, leading edge flow-guiding screen 303.Middle section region injected rubber hose 304 first turns on, in the region use
Section flow-guiding screen 302 and double injected rubber hoses；It can effectively ensure that for glue amount and resin penetration speed, resin be equipped between 3 sections of flow-guiding screens and is slowed down
Band 305 can effectively reduce the flowing velocity of resin forward, increase resin penetration, improve pouring quality, and resin cavity is avoided to lack
Sunken appearance.
The present invention is a kind of root built-in fitting method for filling of large-scale composite material blade, mainly to perfusion runner and pumping
System is improved.Perfusion system is placed continuous felt in built-in fitting solid bottom, is laid with above built-in fitting and upper glass layer of cloth
Flow-guiding screen one and injected rubber hose；One grammes per square metre 160~250g/ ㎡ of built-in fitting and upper glass-fiber-fabric upper layer flow-guiding screen, one start point distance of flow-guiding screen
Built-in fitting 0~300mm of starting point, 1.5~2m of length；Flow-guiding screen one is tangential to be divided into 3 sections, 3 sections of flow-guiding screens (rear flow-guiding screen 301, in
Section flow-guiding screen 302, leading edge flow-guiding screen 303) between open up width be 30~150mm resin deceleration strip.Injected rubber hose is long along built-in fitting
Spend direction arrangement；Distance of the injected rubber hose apart from one edge 0~300mm of deceleration strip of flow-guiding screen, apart from one beginning and end of flow-guiding screen
For 0~100mm.Extract system, after the completion of runner arrangement, blade root and blade inlet edge, rear place air-exhausting bag above runner, take out
Observation window is provided on airbag.
The present invention uses extensively, on different-diameter and the pre-buried type blade of different model in terms of built-in fitting perfusion
It uses.Its process for using are as follows: die cavity prepares, glass is laid with, continuous felt is laid with, built-in fitting is laid with, glass is laid with, water conservancy diversion net laying
If injecting glue pipeline arrangement, air-exhausting bag are placed, glue perfusion.The die cavity for arranging runner is ready to, lower glass-fiber-fabric is first laid with,
It is laid with continuous felt on lower glass-fiber-fabric, built-in fitting is laid with above continuous felt, upper glass-fiber-fabric is laid with above built-in fitting, in upper glass
It is laid with flow-guiding screen one and arrangement injected rubber hose above cloth, air-exhausting bag is placed above in flow-guiding screen one；Glue perfusion is finally carried out, is being filled
Upper glass-fiber-fabric during note above built-in fitting is permeated using one water conservancy diversion of flow-guiding screen, and the lower glass-fiber-fabric below built-in fitting uses continuous
Felt water conservancy diversion.
The present invention is in filling process, and because injected rubber hose is arranged along built-in fitting length direction, flow-guiding screen one covers entire pre-buried
Part installation region, and circumferencial direction is divided into 3 sections, 3 sections of flow-guiding screens (rear flow-guiding screen 301, middle section flow-guiding screen 302, leading edge flow-guiding screens
303) the resin deceleration strip that width is 30~150mm is opened up between；Therefore resin can integrally cover built-in fitting, and synchronous filling is pre-buried
Part gap；Because being equipped with resin deceleration strip, resin can reduce forward's flowing velocity here, increase the seepage flow of resin downwards, fill
Glass-fiber-fabric below the saturating built-in fitting of sub-dip；Remaining injected rubber hose is successively opened by built-in fitting and glass when resin is full of air-exhausting bag observation window
Fine cloth is impregnated with；And because of the effect of air-exhausting bag above built-in fitting, sufficiently the resin bubble between built-in fitting can be discharged.
The above description is only a preferred embodiment of the present invention, is not intended to restrict the invention, and protection scope of the present invention is simultaneously
Not limited to this, anyone skilled in the art in the technical scope disclosed by the present invention, can readily occur in
Change or replacement should be covered by the protection scope of the present invention.
Claims (5)
1. a kind of pre-buried blade root method for filling of bolt sleeve, characterized in that include the following steps:
The step of preparing die cavity；
The step of being laid with lower glass-fiber-fabric；
The step of being laid with continuous felt；
The step of being laid with built-in fitting；
In laying the step of glass-fiber-fabric；
The step of being laid with flow-guiding screen；
The step of arranging injected rubber hose；
The step of placing air-exhausting bag；
The step of glue is perfused；
Continuous felt is placed below in built-in fitting bottom, is laid with flow-guiding screen one and injected rubber hose above built-in fitting and upper glass-fiber-fabric；Water conservancy diversion
Net one start point distance built-in fitting 0~300mm of starting point, one 1.5~2m of length of flow-guiding screen；One circumferencial direction of flow-guiding screen is divided into 3 sections: rear
Flow-guiding screen, middle section flow-guiding screen, leading edge flow-guiding screen, opening up width between the rear flow-guiding screen, middle section flow-guiding screen, leading edge flow-guiding screen is
The resin deceleration strip of 30~150mm；Injected rubber hose is arranged along built-in fitting length direction；Injected rubber hose subtracts apart from one edge resin of flow-guiding screen
0~300mm of speed belt, the distance apart from one beginning and end of flow-guiding screen are 0~100mm.
2. the pre-buried blade root method for filling of bolt sleeve according to claim 1, characterized in that above flow-guiding screen one
Blade root and leading edge, rear place air-exhausting bag.
3. the pre-buried blade root method for filling of bolt sleeve according to claim 1, characterized in that built-in fitting and flow-guiding screen one
160~250g/ of grammes per square metre ㎡.
4. the pre-buried blade root method for filling of bolt sleeve according to claim 2, characterized in that the air-exhausting bag includes height
Molecule one-way ventilating film, flow-guiding screen two, bag film and sealant tape, macromolecule one-way ventilating film and bag film are by sealant tape sealing edge
Edge, flow-guiding screen two are placed among macromolecule one-way ventilating film and bag film；Observation window is opened up on air-exhausting bag.
5. the pre-buried blade root method for filling of bolt sleeve according to claim 1, characterized in that be lower glass below continuous felt
Fine cloth；In filling process, upper glass-fiber-fabric is permeated using one water conservancy diversion of flow-guiding screen, and lower glass-fiber-fabric uses continuous felt water conservancy diversion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610147173.5A CN107199715B (en) | 2016-03-16 | 2016-03-16 | A kind of pre-buried blade root method for filling of bolt sleeve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610147173.5A CN107199715B (en) | 2016-03-16 | 2016-03-16 | A kind of pre-buried blade root method for filling of bolt sleeve |
Publications (2)
| Publication Number | Publication Date |
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| CN107199715A CN107199715A (en) | 2017-09-26 |
| CN107199715B true CN107199715B (en) | 2019-03-01 |
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| CN201610147173.5A Active CN107199715B (en) | 2016-03-16 | 2016-03-16 | A kind of pre-buried blade root method for filling of bolt sleeve |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107972290B (en) * | 2017-12-25 | 2020-04-21 | 江苏金风科技有限公司 | Blade manufacturing method and blade |
| CN109968689B (en) * | 2019-04-25 | 2021-06-15 | 株洲时代新材料科技股份有限公司 | Filling system and filling forming process for embedded wind power blade root |
| CN110328867B (en) * | 2019-07-05 | 2022-03-22 | 国电联合动力技术(连云港)有限公司 | Fan blade flow guide arrangement method |
| CN110757837B (en) * | 2019-09-28 | 2022-04-01 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Hot-pressing curing molding method for cable-embedded composite material of electronic equipment |
| CN112606424B (en) * | 2020-11-20 | 2022-10-18 | 北玻院(滕州)复合材料有限公司 | Vacuum infusion flow guide method for mold with boss |
| CN112571832B (en) * | 2020-11-26 | 2023-05-16 | 株洲飞鹿高新材料技术股份有限公司 | Method for laying diversion net and method for forming wind blade |
| CN112959692B (en) * | 2021-04-01 | 2023-09-01 | 上海艾港风电科技发展有限公司 | Regional pouring process method for wind power blade |
| CN114103161A (en) * | 2021-11-12 | 2022-03-01 | 中国人民解放军国防科技大学 | Vacuum infusion forming method for large-size composite material plate |
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|---|---|---|---|---|
| GB1485361A (en) * | 1974-08-05 | 1977-09-08 | Goodwin P | Structures |
| CN104015375A (en) * | 2014-06-04 | 2014-09-03 | 洛阳双瑞风电叶片有限公司 | Filling molding method of large-thickness area composite product |
| CN104110352A (en) * | 2014-06-19 | 2014-10-22 | 连云港中复连众复合材料集团有限公司 | Method for manufacturing root portion of fan blade with square embedded bolt sleeve |
| CN205058651U (en) * | 2015-11-02 | 2016-03-02 | 株洲时代新材料科技股份有限公司 | Inside girder location structure of wind -powered electricity generation blade casing |
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2016
- 2016-03-16 CN CN201610147173.5A patent/CN107199715B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1485361A (en) * | 1974-08-05 | 1977-09-08 | Goodwin P | Structures |
| CN104015375A (en) * | 2014-06-04 | 2014-09-03 | 洛阳双瑞风电叶片有限公司 | Filling molding method of large-thickness area composite product |
| CN104110352A (en) * | 2014-06-19 | 2014-10-22 | 连云港中复连众复合材料集团有限公司 | Method for manufacturing root portion of fan blade with square embedded bolt sleeve |
| CN205058651U (en) * | 2015-11-02 | 2016-03-02 | 株洲时代新材料科技股份有限公司 | Inside girder location structure of wind -powered electricity generation blade casing |
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|---|---|
| CN107199715A (en) | 2017-09-26 |
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