CN103909662A - Method for manufacturing embedded bolt sleeve at root of fan blade by pultrusion process - Google Patents
Method for manufacturing embedded bolt sleeve at root of fan blade by pultrusion process Download PDFInfo
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- CN103909662A CN103909662A CN201410172748.XA CN201410172748A CN103909662A CN 103909662 A CN103909662 A CN 103909662A CN 201410172748 A CN201410172748 A CN 201410172748A CN 103909662 A CN103909662 A CN 103909662A
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- Prior art keywords
- embedded bolt
- cover
- fan blade
- root
- metal bolts
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- 238000000034 method Methods 0.000 title claims abstract description 62
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 238000000465 moulding Methods 0.000 claims abstract description 16
- 238000002360 preparation method Methods 0.000 claims abstract description 5
- 239000002184 metal Substances 0.000 claims description 31
- 239000003365 glass fiber Substances 0.000 claims description 17
- 229920005989 resin Polymers 0.000 claims description 14
- 239000011347 resin Substances 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- 239000011521 glass Substances 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000004744 fabric Substances 0.000 claims description 6
- 230000010412 perfusion Effects 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 238000013461 design Methods 0.000 claims description 5
- 239000003292 glue Substances 0.000 claims description 5
- 238000005422 blasting Methods 0.000 claims description 4
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 3
- 229920006387 Vinylite Polymers 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 3
- 230000003746 surface roughness Effects 0.000 claims description 3
- 230000037452 priming Effects 0.000 claims description 2
- 238000007711 solidification Methods 0.000 claims description 2
- 230000008023 solidification Effects 0.000 claims description 2
- 240000007182 Ochroma pyramidale Species 0.000 claims 1
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 229920005749 polyurethane resin Polymers 0.000 claims 1
- 239000011229 interlayer Substances 0.000 abstract description 3
- 230000037303 wrinkles Effects 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 5
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000009787 hand lay-up Methods 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011152 fibreglass Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
- 239000008832 zhongfu Substances 0.000 description 1
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
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/50—Shaping or impregnating by compression not applied for producing articles of indefinite length, e.g. prepregs, sheet moulding compounds [SMC] or cross moulding compounds [XMC]
- B29C70/52—Pultrusion, i.e. forming and compressing by continuously pulling through a die
- B29C70/521—Pultrusion, i.e. forming and compressing by continuously pulling through a die and impregnating the reinforcement before the die
-
- 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
- B29C70/34—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 shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
- B29C70/342—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 shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation using isostatic pressure
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a method for manufacturing an embedded bolt sleeve at the root of a fan blade by a pultrusion process. The method comprises preparation of an embedded bolt sleeve precast block, and molding of the embedded bolt sleeve precast block and a fan blade. The embedded bolt sleeve precast block is fabricated by the pultrusion process, the pultrusion process has the advantages of continuity, high industrial degree and high production efficiency, and the fabricated embedded bolt sleeve has the advantages of stable quality, high size precision, large strength and the like, and is suitable for the fan blade with large load at the root and with connection to a large quantity of bolts. The problems of incontinuity in laying, interlayer asymmetry, high probability of wrinkles and air bubbles and the like caused by manual laying and pasting can be overcome.
Description
Technical field
Patent of the present invention relates to a kind of fan blade root and adopts pre-embedded bolt cover to manufacture the method for root of blade, be specifically related to one and pass through pultrusion molding process of glass fiber reinforced plastic, manufacture pultrusion bolt sleeve built-in fitting, use the bolt sleeve built-in fitting of pultrusion arrange root of blade and the moulding of blade shell overall perfusion, make the method that root of blade pre-embedded bolt overlaps.
Background technology
Wind Power In China industry was since 2005, and through the fast development of 9 years, wind-driven generator set product obtained abundant fast, and type has had tens kinds.The wind field of its covering is from surpassing a class to weak four classes.
Wind wheel blade in the wind power generating set that Lianyungang Zhongfu Lianzhong Composite Material Group Co.,Ltd's research and development are produced.Length has extended to 75 meters by 31 meters.Fan blade is one of critical component transforming wind energy, its traveling comfort is to wind energy conversion system generating and important, horizontal axis wind-driven generator group wind wheel blade is by using high-strength bolt to be connected with axial fan hub, along with the growth of length of blade, leaf weight also increases, the suffered load of blade also increases, and high strength connecting bolt need bear from the various load on blade and also increase thereupon.
At present, domestic fan blade generally adopts root to adopt perforating type that root of blade connecting bolt is installed, this kind of method for fan blade root bearing load less and bolt that application is installed quantitative fan blade is more successful, but along with the increase of the wind-powered electricity generation power of the assembling unit, the length of supporting fan blade and root size thereof are also increasing with it, its weight also increases a lot thereupon, this has just caused fan blade root connecting bolt will bear larger load, also just higher to its performance requirement, larger for satisfactory its difficulty of root bolt of exploitation, the method that exploitation strengthens root performance becomes the approach of dealing with problems.
Summary of the invention
Goal of the invention: the object of the invention is in order to solve the deficiencies in the prior art, provide a kind of steady quality, size accurate, workable, adhesive property is reliable, bonding strength is high, the method for the fan blade root pre-embedded bolt cover that the employing pultrude process that production efficiency is high is manufactured.The fan blade that fan blade root pre-embedded bolt sleeve forming method provided by the invention prepares, can meet fan blade root bearing load greatly or the many fan blades of bolt quantity.
Technical scheme: in order to realize object of the present invention, the technical solution used in the present invention is:
A method that adopts the fan blade root pre-embedded bolt cover of pultrude process manufacture, it comprises the following steps:
The preparation of pre-embedded bolt cover prefabricated section:
A, first get metal bolts cover, first with the first connector, metal bolts cover is coupled together with changeover portion, described changeover portion is made up of steel pipe or core, steel duct needs filling with light material, then metal bolts cover and changeover portion outer surface are carried out to blasting treatment, increase its surface roughness, then adopt the second connector to couple together in several metal bolts covers and obtain metal bolts cover bar;
B, according to production engineering specifications, the metal bolts cover and the changeover portion bar that couple together with connector are placed in the pipe die of extruding equipment, then the glass fiber yarn designing is arranged in creel, set after technological parameter, then with extruding equipment, glass fiber yarn tractive process is collected to creel, glue groove, multiple yarn dividing plate side by side, traction enters mould, the glass fiber yarn that allows metal bolts cover bar and be soaked with resin is in mould, by pultrusion, the moulding that is heating and curing, then cuts into pre-embedded bolt cover prefabricated section through cutting machine by dimensional requirement;
Pre-embedded bolt cover prefabricated section and fan blade moulding:
On blade mold root, lay the glass fabric of a given layer according to technological design, the pre-embedded bolt cover prefabricated section completing is arranged in to blade mold root, and pre-embedded bolt is overlapped on the locating flange that prefabricated section is fixed on blade mold root with bolt, then on pre-embedded bolt cover prefabricated section, lay the glass fabric of a given layer, lay vacuum film, set up priming by vacuum system, then pre-embedded bolt is overlapped to prefabricated section and blade integral perfusion resin, moulding is heating and curing.After blade integral completes, until when root bolt operation is installed, directly construction bolt in metal bolts cover.
As preferred version, the method for the fan blade root pre-embedded bolt cover that above-described employing pultrude process is manufactured, described metal bolts cover adopts 42CrMoA steel alloy to make.Have high strength, stable connection is reliable, can meet the needs of fan blade top load operation.And bolt sleeve size requires design bolt sleeve size according to fan blade root size and bolt quantity.
As preferred version, the method for the fan blade root pre-embedded bolt cover that above-described employing pultrude process is manufactured, the material such as described light material is PVC.
As preferred version, the method for the fan blade root pre-embedded bolt cover that above-described employing pultrude process is manufactured, is equipped with epoxy resin or vinylite in described glue groove.
As preferred version, the method for the fan blade root pre-embedded bolt cover that above-described employing pultrude process is manufactured, described glass fiber yarn adopts 1109 strands of direct yarns of 4800TEX.
As preferred version, the method of the fan blade root pre-embedded bolt cover that above-described employing pultrude process is manufactured, pultrusion speed is less than 0.1m/min, and in pipe die, the temperature of each heating plate can arrange according to the temperature of resin manufacturer's recommended, thereby realizes the moulding that is heating and curing.
Fan blade root pre-embedded bolt sleeve forming method provided by the invention, wherein bolt sleeve end connects wedge metal part, can guarantee that swivel nut end seamlessly transits, and increases the degree that is connected firmly.Metal bolts cover outer surface of the present invention, through blasting treatment, can have sufficient bonding plane with the glass fiber yarn that is soaked with resin, can effectively avoid bonding gap and hole, improves the bonding reliability energy of metal bolts cover.
Fan blade root pre-embedded bolt sleeve forming method of the present invention, the preparation of pre-embedded bolt cover, first manufacturing in mould separately, without taking the main mould of blade shell, can effectively improve production efficiency.
The present invention adopts pultrusion molding process fan blade root metal bolts cover to be become to blower fan root of blade pre-embedded bolt cover with glass fiber yarn and resin pultrusion, bolt sleeve is arranged in to fan blade root, then moulding together with fan blade root glass layer, the pultrude process utilizing is continuous, pre-embedded bolt cover steady quality, the size of making are accurate, can overcome and adopt hand lay-up to paste the laying causing discontinuous, interlayer is inhomogeneous, be prone to fold, the deficiency of the unfavorable conditions such as bubble.Adopt pultrusion continuous producing method of the present invention, root pre-embedded bolt cover is wrapped in to stretching fiber inside, production efficiency can be provided greatly, and can guarantee product quality and performances, root intensity is high, can well meet 5MW and more than, 75 meters long of fan blades and more than, the fan blade that load demand is large.
Beneficial effect: compared to the prior art the method for the fan blade root pre-embedded bolt cover of employing pultrude process provided by the invention manufacture has the following advantages:
The fan blade root pre-embedded bolt sleeve forming method that invention provides, make pre-embedded bolt cover prefabricated section by pultrude process, pultrude process has continuity, industrialization degree is high, production efficiency is high, the advantages such as it is accurately high that the product of its making has steady quality, size, and intensity is large, can well meet the fan blade that the suffered load of fan blade root is beaten or root connecting bolt is many.Can overcome and adopt hand lay-up to paste the laying causing discontinuous, interlayer is inhomogeneous, is prone to fold, the problem that bubble etc. are not enough.
And the present invention adopts bolt that pre-embedded bolt is overlapped on the locating flange that prefabricated section is fixed on blade mold root, finally pre-embedded bolt is overlapped to prefabricated section and blade integral perfusion curing molding, positional accuracy is high, connects more firm, the firm degree that bonds is high, and reliability is strong.
Accompanying drawing explanation
Fig. 1 is the structural representation of pre-embedded bolt cover prefabricated section of the present invention.
Fig. 2 is the process schematic diagram that employing pultrude process of the present invention is manufactured fan blade root pre-embedded bolt cover.
Fig. 3 is the mounting structure schematic diagram of pipe die of the present invention.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, further illustrate the present invention, should understand these embodiment is only not used in and limits the scope of the invention for the present invention is described, after having read the present invention, those skilled in the art all fall within the application's claims limited range to the modification of the various equivalent form of values of the present invention.
A method that adopts the fan blade root pre-embedded bolt cover of pultrude process manufacture, is characterized in that comprising the following steps:
The preparation of pre-embedded bolt cover prefabricated section:
A, as shown in Figure 1, first get metal bolts cover (1), metal bolts cover (1) and changeover portion (2) are linked together with the first connector (4-1), described changeover portion (2) is made up of steel pipe or core, light filling PVC material (3) in the middle of steel pipe, then metal bolts cover (1) and changeover portion (2) outer surface are carried out to blasting treatment, increase its surface roughness, then adopt the second connector (4-2) to couple together in several metal bolts covers (1) and obtain metal bolts cover bar;
B, as shown in Figures 2 and 3, according to production engineering specifications, the metal bolts cover (1) and changeover portion (2) bar that connect by the first connector (4-1) are placed in the pipe die (5) of extruding equipment, then the both sides that the glass fiber yarn designing are arranged in to extruding equipment are in creel (6), glass fiber yarn is directly from both sides creel (6) device, by two glue grooves that epoxy resin or vinylite are housed of both sides, glass fiber yarn is infiltrated and have resin, then having good positioning, (pipe die (5) location relies on the pipe die location-plate on pipe die location-plate (5-1) and four bracing struts to pipe die (5), pipe die (5) and the different axle center of mould (10)), metal bolts cover bar has the glass fiber yarn of resin to collect by the pipe die (5) of accurate positioning with infiltration, and infiltrate and have the glass fiber yarn of resin under extruding equipment traction, by multiple yarn dividing plates (9) side by side, pipe die (5) location-plate, bundle yarn plate (12) enters the die cavity of mould (10), and (wherein the design of yarn dividing plate (9) can be according in product size, directly the content annular of yarn is uniform, thereby guarantee the reasonability of the distribution of fiber in mould), the glass fiber yarn that allows metal bolts cover bar and be soaked with resin is in mould (10), by pultrusion, moulding is heating and curing, then pass through cutting machine (11) and cut into pre-embedded bolt cover prefabricated section by dimensional requirement,
Pre-embedded bolt cover prefabricated section and fan blade moulding:
First process blade mold, then lay the glass fabric of a given layer according to technological design at root, be arranged in root of blade by pre-embedded bolt cover prefabricated section by blade technological requirement again, and pre-embedded bolt is overlapped on the locating flange that prefabricated section is fixed on blade mold root with bolt, then on pre-embedded bolt cover prefabricated section, lay the glass fabric of a given layer, lay vacuum film, set up vacuum system filling system, finally pre-embedded bolt is overlapped to prefabricated section and blade integral perfusion resin curing molding.After blade integral completes, until when root bolt operation is installed, directly construction bolt in metal bolts cover.
The method of the fan blade root pre-embedded bolt cover that above-described employing pultrude process is manufactured, described metal bolts cover (1) adopts 42CrMoA steel alloy to make.
The method of the fan blade root pre-embedded bolt cover that above-described employing pultrude process is manufactured, described glass fiber yarn adopts 1109 strands of direct yarns of 4800TEX.
The method of the fan blade root pre-embedded bolt cover that above-described employing pultrude process is manufactured, configuration heating system in described pipe die (5), can guarantee just to enter in mould (10) after embedded bolt sleeve reaches predetermined temperature, thus problem of solidification and the product quality problem that can avoid temperature difference to cause.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (5)
1. a method that adopts the fan blade root pre-embedded bolt cover of pultrude process manufacture, is characterized in that comprising the following steps:
The preparation of pre-embedded bolt cover prefabricated section:
A, first get metal bolts cover (1), first use the first connector (4-1) that metal bolts cover (1) and changeover portion (2) are coupled together, described changeover portion (2) is made up of steel pipe or core, steel duct needs filling with light material (3), then metal bolts cover (1) and changeover portion (2) outer surface are carried out to blasting treatment, increase its surface roughness, then adopt the second connector (4-2) to couple together in several metal bolts covers (1) and obtain metal bolts cover bar;
B, according to production engineering specifications, the metal bolts cover (1) coupling together with connector (4-1) and changeover portion (2) bar are placed in the pipe die (5) of extruding equipment, then the glass fiber yarn designing is arranged in creel (6), then with extruding equipment, glass fiber yarn tractive process is collected to creel (7), glue groove (8), multiple yarn dividing plates (9) side by side, traction enters mould (10), the glass fiber yarn that allows metal bolts cover bar and be soaked with resin is in mould (10), by pultrusion, moulding is heating and curing, then pass through cutting machine (11) and cut into pre-embedded bolt cover prefabricated section by dimensional requirement,
Pre-embedded bolt cover prefabricated section and fan blade moulding:
On blade mold root, lay the glass fabric of certain number of plies according to technological design, the above-mentioned pre-embedded bolt cover prefabricated section preparing is arranged on blade mold root, and pre-embedded bolt is overlapped on the locating flange that prefabricated section is fixed on blade mold root with bolt, then on pre-embedded bolt cover prefabricated section, lay the glass fabric of certain number of plies, lay vacuum film, set up priming by vacuum system, again pre-embedded bolt is overlapped to prefabricated section and blade integral perfusion resin, after resin perfusion, heating, resin solidification moulding.
2. the method for the fan blade root pre-embedded bolt cover that employing pultrude process according to claim 1 is manufactured, is characterized in that, described metal bolts cover (1) adopts 42CrMoA steel alloy to make.
3. the method for the fan blade root pre-embedded bolt cover that employing pultrude process according to claim 1 is manufactured, is characterized in that, described light material (3) is PVC or cork wood material.
4. the method for the fan blade root pre-embedded bolt cover of manufacturing according to the employing pultrude process described in claims 1 to 3 any one, is characterized in that, in described glue groove (8), epoxy resin, vinylite or polyurethane resin material is housed.
5. the method for the fan blade root pre-embedded bolt cover that employing pultrude process according to claim 4 is manufactured, is characterized in that, described glass fiber yarn adopts 1109 strands of direct yarns of 4800TEX.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410172748.XA CN103909662B (en) | 2014-04-28 | 2014-04-28 | A kind of method of the root of fan blade pre-embedded bolt cover adopting pultrude process to manufacture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410172748.XA CN103909662B (en) | 2014-04-28 | 2014-04-28 | A kind of method of the root of fan blade pre-embedded bolt cover adopting pultrude process to manufacture |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103909662A true CN103909662A (en) | 2014-07-09 |
| CN103909662B CN103909662B (en) | 2016-01-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410172748.XA Active CN103909662B (en) | 2014-04-28 | 2014-04-28 | A kind of method of the root of fan blade pre-embedded bolt cover adopting pultrude process to manufacture |
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| Country | Link |
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| CN (1) | CN103909662B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105465141A (en) * | 2016-01-05 | 2016-04-06 | 中复碳芯电缆科技有限公司 | Pultrusion type embedded blade root connector for wind-driven generator blades and preparation method thereof |
| CN104859160B (en) * | 2015-05-29 | 2018-09-25 | 连云港中复连众复合材料集团有限公司 | It is suitble to the root of fan blade pre-embedded bolt set and preparation method thereof of pultrude process |
| CN112693132A (en) * | 2019-10-07 | 2021-04-23 | 通用汽车环球科技运作有限责任公司 | Reinforced preform and method of molding |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070065288A1 (en) * | 2003-06-12 | 2007-03-22 | Flemming Sorensen | Wind turbine blade and method of manufacturing thereof |
| CN101865092A (en) * | 2009-04-14 | 2010-10-20 | 上海艾郎风电科技发展有限公司 | Method for mounting and positioning megawatt wind-power blade root end bolt |
| CN103264510A (en) * | 2013-05-29 | 2013-08-28 | 连云港中复连众复合材料集团有限公司 | Molding method of embedded bolt sleeve at root of fan blade |
-
2014
- 2014-04-28 CN CN201410172748.XA patent/CN103909662B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070065288A1 (en) * | 2003-06-12 | 2007-03-22 | Flemming Sorensen | Wind turbine blade and method of manufacturing thereof |
| CN101865092A (en) * | 2009-04-14 | 2010-10-20 | 上海艾郎风电科技发展有限公司 | Method for mounting and positioning megawatt wind-power blade root end bolt |
| CN103264510A (en) * | 2013-05-29 | 2013-08-28 | 连云港中复连众复合材料集团有限公司 | Molding method of embedded bolt sleeve at root of fan blade |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104859160B (en) * | 2015-05-29 | 2018-09-25 | 连云港中复连众复合材料集团有限公司 | It is suitble to the root of fan blade pre-embedded bolt set and preparation method thereof of pultrude process |
| CN105465141A (en) * | 2016-01-05 | 2016-04-06 | 中复碳芯电缆科技有限公司 | Pultrusion type embedded blade root connector for wind-driven generator blades and preparation method thereof |
| CN112693132A (en) * | 2019-10-07 | 2021-04-23 | 通用汽车环球科技运作有限责任公司 | Reinforced preform and method of molding |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103909662B (en) | 2016-01-13 |
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