CN114893341A - Carbon fiber resin-based alloy wind driven generator blade - Google Patents
Carbon fiber resin-based alloy wind driven generator blade Download PDFInfo
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- CN114893341A CN114893341A CN202210573163.3A CN202210573163A CN114893341A CN 114893341 A CN114893341 A CN 114893341A CN 202210573163 A CN202210573163 A CN 202210573163A CN 114893341 A CN114893341 A CN 114893341A
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- 239000000956 alloy Substances 0.000 title claims abstract description 36
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Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor
- F03D1/06—Rotors
- F03D1/065—Rotors characterised by their construction elements
- F03D1/0675—Rotors characterised by their construction elements of the blades
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B13/00—Conditioning or physical treatment of the material to be shaped
- B29B13/06—Conditioning or physical treatment of the material to be shaped by drying
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/002—Methods
- B29B7/005—Methods for mixing in batches
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
- C08J5/06—Reinforcing macromolecular compounds with loose or coherent fibrous material using pretreated fibrous materials
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2377/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
- C08J2377/02—Polyamides derived from omega-amino carboxylic acids or from lactams thereof
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2377/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
- C08J2377/06—Polyamides derived from polyamines and polycarboxylic acids
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention discloses a carbon fiber resin-based alloy wind driven generator blade which comprises a fishbone-shaped frame, a mounting seat, a mounting bolt and a panel, wherein the fishbone-shaped frame comprises a metal main beam and a side beam, the metal main beam and the fishbone-shaped frame are connected through transverse supporting rods, and the panel is made of a carbon fiber resin-based nylon alloy material. According to the invention, the thermoplastic carbon fiber resin-based alloy material with excellent performance is obtained by a modification means, the high-performance composite material realizes the thermoplastic wind driven generator blade, no harmful powder is scattered in the ambient air in the long-term operation process of the wind driven generator blade, the ecological environment is protected, and the thermoplastic carbon fiber resin-based alloy blade has the advantages of light weight, high strength and long service life compared with a thermosetting epoxy resin blade, and is more beneficial to improving the efficiency of the wind driven generator.
Description
Technical Field
The invention relates to the related technical field of wind driven generator blades, in particular to a carbon fiber resin-based alloy wind driven generator blade.
Background
The existing wind power blade is mainly produced by a solid-bearing material, and the solid-bearing blade has a plurality of problems;
(1) for example, harmful gases such as dimethylbenzene and benzene are discharged in the process of producing the epoxy resin wind power blade, and meanwhile harmful dust such as glass fiber powder causes serious harm to the body of an operator.
(2) The thermosetting blade generates harmful dust on the surface in the aging process, and seriously pollutes the surrounding environment.
(3) The waste thermosetting blades can not be recycled, and can not be decomposed in soil for hundreds of years, thereby seriously polluting the environment.
Disclosure of Invention
Technical problem
The invention aims to provide a carbon fiber resin-based alloy wind driven generator blade, which aims to solve the problems of pollution generation and incapability of recycling in the background technology.
Technical scheme
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a carbon fiber resin base alloy aerogenerator blade, the blade includes fishbone type frame, mount pad, construction bolt and panel, fishbone type frame includes metal girder and curb girder, and connects through the branch of violently going between metal girder and the fishbone type frame to the mounting hole has been seted up on the branch of violently going, the panel is installed through the mounting in fishbone type frame surface, and the inside special glue of nylon that glues that fills of panel joint between the mount pad of panel and bottom, and the construction bolt is installed to the mount pad bottom, the panel adopts carbon fiber resin base nylon alloy material to make, and carbon fiber resin base nylon alloy material mass fraction ratio includes simultaneously: 0-35% of carbon fiber, 40-60% of polyamide, 2-8% of toughening agent, 2-5% of phase solvent, 1-5% of anti-aging agent, 1-4% of ultraviolet absorbent and 0.5-5% of dispersing agent, and the carbon fiber and the polyamide composite material are mixed to prepare the carbon fiber resin-based nylon alloy material.
Further, the carbon fiber is 12k filament.
Further, the polyamide is selected from PA6, PA66, PA12 or a combination of several.
Further, the carbon fiber is obtained by carrying out surface activation treatment on 12k carbon fiber yarns by using a coupling agent KA 550.
Further, the polyamide material is mixed with a toughening agent, a phase solvent, an anti-aging agent, an ultraviolet absorbent and a dispersing agent and then is uniformly stirred by a stirrer, and a drying agent is used for 6 hours to prepare the composite material for later use at 90-110 ℃.
Further, the blade injection mold is used for injection molding.
Furthermore, the fishbone-shaped frame is formed by welding steel, the fishbone-shaped frame and the mounting seat are welded together, and the fishbone-shaped frame, the mounting seat and the mounting bolt form a metal framework of the blade.
Furthermore, the panel is fixed on the surface of the metal framework by a plurality of bolts and special bonding glue, and the connecting gap between the plane plates is filled by the special bonding glue.
Technical effects
Compared with the prior art, the invention has the beneficial effects that:
the thermoplastic carbon fiber resin-based alloy material with excellent performance is obtained by a modification means, the high-performance composite material realizes the thermoplastic wind driven generator blade, the pollution of xylene, benzene, glass fiber powder and the like generated in the thermosetting production process flow to the production environment is overcome, the problem of serious damage to the body of an operator is avoided, no harmful powder is scattered in the ambient air during the long-term operation of the wind driven generator blade, the ecological environment is protected, and the thermoplastic carbon fiber resin-based alloy blade is lighter in weight, high in strength and long in service life than the thermosetting epoxy resin blade, and is more beneficial to improving the efficiency of the wind driven generator.
Drawings
FIG. 1 is a front expanded view of the structure of the present invention;
FIG. 2 is a schematic side view of the structure of the present invention;
FIG. 3 is a schematic bottom view of the structure of the present invention;
FIG. 4 is a schematic top view of the structure of the present invention.
Shown in the figure: 1. a metal main beam; 2. a side beam; 3. a fishbone-shaped frame; 4. a mounting seat; 5. installing a bolt; 6. mounting holes; 7. a panel; 8. the panel is connected with the seam.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
A carbon fiber resin-based alloy wind driven generator blade comprises a fishbone-shaped frame 3, a mounting seat 4, a mounting bolt 5 and a panel 7, wherein the fishbone-shaped frame 3 comprises a metal main beam 1 and side beams 2, the metal main beam 1 and the fishbone-shaped frame 3 are connected through transverse support rods, and the horizontal supporting rod is provided with a mounting hole 6, a panel 7 is fixed by mounting a screw on the mounting hole, the surface of the fishbone frame 3 is provided with the panel 7 by a fixing piece, and the panel connecting seam 8 between the panel 7 and the mounting seat 4 at the bottom is filled with glue special for nylon adhesion, the bottom of the mounting seat 4 is provided with a mounting bolt 5, carry out the aggregate erection through construction bolt 5 and current aerogenerator's correlation structure, panel 7 adopts carbon fiber resin base nylon alloy material to make, and carbon fiber resin base nylon alloy material mass fraction includes simultaneously: 0-35% of carbon fiber, 40-60% of polyamide, 2-8% of toughening agent, 2-5% of phase solvent, 1-5% of anti-aging agent, 1-4% of ultraviolet absorbent and 0.5-5% of dispersing agent, and the carbon fiber is mixed with the polyamide composite material to prepare a carbon fiber resin-based nylon alloy material, wherein the carbon fiber is 12k filaments; the polyamide is selected from PA6, PA66, PA12 or a combination of several of the PA6, the PA66 and the PA 12; the carbon fiber is obtained by carrying out surface activation treatment on 12k carbon fiber yarns by using a coupling agent KA 550; mixing the polyamide material with a toughening agent, a phase solvent, an anti-aging agent, an ultraviolet absorbent and a dispersing agent, uniformly stirring by using a stirrer, drying for 6 hours, and preparing a composite material at 90-110 ℃ for later use; injection molding of the blade injection mold; the fishbone-shaped frame 3 is formed by welding steel materials, the fishbone-shaped frame 3 and the mounting seat 4 are welded together, and the fishbone-shaped frame 3, the mounting seat 4 and the mounting bolt 5 form a metal framework of the blade; the panel 7 is fixed on the surface of the metal framework by a plurality of bolts and special bonding glue, and the special bonding glue is used for repairing the connecting gap between the plane plates to process the gap, so that the deformation of the panel when the gap is enlarged for a long time is avoided.
The preparation method of the carbon fiber resin-based nylon alloy material comprises the following steps:
s1, performing surface activation treatment on the long carbon fiber yarns by using a KA550 coupling agent, diluting the long carbon fiber yarns by using purified water at a ratio of KA550:1: 25-1: 100, infiltrating for 2-6h, taking out, and drying for 4-6 h at the temperature of 90-130 ℃.
S2, adding a toughening agent PE-G-MAH with the proportion of 2-10%;
s3, adding a phase solvent SMA in a proportion of 2-5%;
s4, adding an anti-aging agent SC-H10 in a proportion of 1-5 per mill;
s5, adding an external absorbent UV-234 with the proportion of 1-4 per mill;
s6, adding dispersant EBS-P460 with the proportion of 0.5-5%;
s7, adding the polyamide material, the toughening agent, the phase solvent, the anti-aging agent, the ultraviolet absorbent and the dispersing agent into a stirrer, mixing and stirring for 0.5-2 h, adding into a drying device, and drying at 90-110 ℃ for 6-12 h.
S8, the mass percentage of the thermoplastic carbon fiber resin matrix composite material is as follows:
10% of long carbon fiber: 35-60% of polyamide: 2-10% of toughening agent: 2-5% of compatilizer: 1-5% of anti-aging agent: 1-4% of ultraviolet absorbent: 0.5 to 5 percent of dispersant;
and S9, mixing the carbon fibers by using a double-screw device to prepare the carbon fiber composite material.
Example two
The difference from the first embodiment is only that the mass ratio of the long carbon fiber filaments in the preparation method of the carbon fiber resin-based nylon alloy material is 15%.
The preparation method of the carbon fiber resin-based nylon alloy material comprises the following steps:
s1, performing surface activation treatment on the long carbon fiber yarns by using a KA550 coupling agent, diluting the long carbon fiber yarns by using purified water at a ratio of KA550:1: 25-1: 100, infiltrating for 2-6h, taking out, and drying for 4-6 h at the temperature of 90-130 ℃.
S2, adding a toughening agent PE-G-MAH with the proportion of 2-10%;
s3, adding a phase solvent SMA in a proportion of 2-5%;
s4, adding an anti-aging agent SC-H10 in a proportion of 1-5 per mill;
s5, adding an external absorbent UV-234 with the proportion of 1-4 per mill;
s6, adding dispersant EBS-P460 with the proportion of 0.5-5%;
s7, adding the polyamide material, the toughening agent, the phase solvent, the anti-aging agent, the ultraviolet absorbent and the dispersing agent into a stirrer, mixing and stirring for 0.5-2 h, adding into a drying device, and drying at 90-110 ℃ for 6-12 h.
S8, the mass percentage of the thermoplastic carbon fiber resin matrix composite material is as follows:
15% of long carbon fiber: 35-60% of polyamide: 2-10% of toughening agent: 2-5% of compatilizer: 1-5% of anti-aging agent: 1-4% of ultraviolet absorbent: 0.5 to 5 percent of dispersant;
and S9, mixing the carbon fibers by using a double-screw device to prepare the carbon fiber composite material.
EXAMPLE III
The difference from the first embodiment is only that the mass ratio of the long carbon fiber filaments in the preparation method of the carbon fiber resin-based nylon alloy material is 35%.
The preparation method of the carbon fiber resin-based nylon alloy material comprises the following steps:
s1, performing surface activation treatment on the long carbon fiber yarns by using a KA550 coupling agent, diluting the long carbon fiber yarns by using purified water at a ratio of KA550:1: 25-1: 100, infiltrating for 2-6h, taking out, and drying for 4-6 h at the temperature of 90-130 ℃.
S2, adding a toughening agent PE-G-MAH with the proportion of 2-10%;
s3, adding a phase solvent SMA in a proportion of 2-5%;
s4, adding an anti-aging agent SC-H10 in a proportion of 1-5 per mill;
s5, adding an external absorbent UV-234 with the proportion of 1-4 per mill;
s6, adding dispersant EBS-P460 with the proportion of 0.5-5%;
s7, adding the polyamide material, the toughening agent, the phase solvent, the anti-aging agent, the ultraviolet absorbent and the dispersing agent into a stirrer, mixing and stirring for 0.5-2 h, adding into a drying device, and drying at 90-110 ℃ for 6-12 h.
S8, the mass percentage of the thermoplastic carbon fiber resin matrix composite material is as follows:
35% of long carbon fiber: 35-60% of polyamide: 2-10% of toughening agent: 2-5% of compatilizer: 1-5% of anti-aging agent: 1-4% of ultraviolet absorbent: 0.5 to 5 percent of dispersant;
and S9, mixing the carbon fibers by using a double-screw device to prepare the carbon fiber composite material.
Comparative example one: the difference from the first example is only that the non-fiber reinforced nylon material with the fiber mass fraction of 0 percent is adopted.
Comparative example two: the mass ratio of the carbon fiber yarns in the preparation method of the carbon fiber resin-based nylon alloy material is only 15%, and the carbon fiber yarns are short fiber yarns.
The preparation method of the carbon fiber resin-based nylon alloy material comprises the following steps:
s1, performing surface activation treatment on the long carbon fiber yarns by using a KA550 coupling agent, diluting the long carbon fiber yarns by using purified water at a ratio of KA550:1: 25-1: 100, infiltrating for 2-6h, taking out, and drying for 4-6 h at the temperature of 90-130 ℃.
S2, adding a toughening agent PE-G-MAH with the proportion of 2-10%;
s3, adding a phase solvent SMA in a proportion of 2-5%;
s4, adding an anti-aging agent SC-H10 in a proportion of 1-5 per mill;
s5, adding an external absorbent UV-234 with the proportion of 1-4 per mill;
s6, adding dispersant EBS-P460 with the proportion of 0.5-5%;
s7, adding the polyamide material, the toughening agent, the phase solvent, the anti-aging agent, the ultraviolet absorbent and the dispersing agent into a stirrer, mixing and stirring for 0.5-2 h, adding into a drying device, and drying at 90-110 ℃ for 6-12 h.
S8, the mass percentage of the thermoplastic carbon fiber resin matrix composite material is as follows:
short staple 15%: 35-60% of polyamide: 2-10% of toughening agent: 2-5% of compatilizer: 1-5% of anti-aging agent: 1-4% of ultraviolet absorbent: 0.5 to 5 percent of dispersant;
and S9, mixing the carbon fibers by using a double-screw device to prepare the carbon fiber composite material.
Comparative example three: the difference from the first embodiment is only that the nylon material reinforced by the long glass fiber with 15% of fiber mass fraction is adopted.
The mechanical properties of the nylon added with the fiber are greatly improved. In the fiber reinforced composite material, the carbon fiber reinforced resin matrix composite material is a composite material which takes carbon fiber as a disperse phase polymer as a continuous phase, the high strength and modulus of the fiber material enable the fiber material to be a main bearing body, the matrix material plays a role of enabling an external load to be uniformly distributed and transmitted to the carbon fiber, the fiber content, the fiber strength, the fiber length and the fiber distribution directly influence the final mechanical property of the fiber material, under the action of the external force, the strain of the fiber and the strain of the matrix resin are enabled to be equal as a whole by the composite material, however, the elastic modulus of the matrix resin is much smaller than that of the reinforced fiber, so when the fiber and the matrix are under the same strain, the stress in the fiber is much larger than that in the matrix, and therefore, most of the load is borne. Another reason for the composite reinforcement is the effect of the matrix to inhibit cracks, the flexible matrix deflects by virtue of the shear action so that cracks do not develop in the vertical direction, a large part of the fracture energy is used for resisting the adhesion of the matrix to the fibers, and the resistance to crack generation, growth, fracture and crack propagation is greatly improved, so that the mechanical properties are greatly improved and enhanced.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A carbon fiber resin-based alloy wind driven generator blade is characterized in that: the blade includes fishbone type frame (3), mount pad (4), construction bolt (5) and panel (7), fishbone type frame (3) include metal girder (1) and curb girder (2), and connect through the branch of violently going between metal girder (1) and fishbone type frame (3) to mounting hole (6) have been seted up on the branch of violently going, panel (7) are installed through the mounting in fishbone type frame (3) surface, and panel joint seam (8) inside between mount pad (4) of panel (7) and bottom fills glues special glue of nylon, and mounting bolt (5) are installed to mount pad (4) bottom, panel (7) adopt carbon fiber resin base nylon alloy material to make, and carbon fiber resin base nylon alloy material mass fraction ratio includes simultaneously: 10-35% of carbon fiber, 40-60% of polyamide, 2-8% of toughening agent, 2-5% of phase solvent, 1-5% of anti-aging agent, 1-4% of ultraviolet absorbent and 0.5-5% of dispersing agent, and the carbon fiber and the polyamide composite material are mixed to prepare the carbon fiber resin-based nylon alloy material.
2. The carbon fiber resin-based alloy wind turbine blade according to claim 1, wherein: the carbon fibers are 12k filaments.
3. The carbon fiber resin-based alloy wind turbine blade according to claim 1, wherein: the polyamide is selected from one of PA6, PA66, PA12 or the combination of several of the PA6, the PA66 and the PA 12.
4. The carbon fiber resin-based alloy wind turbine blade according to claim 3, wherein: the carbon fiber is obtained by carrying out surface activation treatment on 12k carbon fiber yarns by using a coupling agent KA 550.
5. The carbon fiber resin-based alloy wind turbine blade according to claim 1, wherein: the polyamide material is mixed with a toughening agent, a phase solvent, an anti-aging agent, an ultraviolet absorbent and a dispersing agent and then is uniformly stirred by a stirrer, and a composite material is prepared by drying agent for 6 hours at 90-110 degrees for later use.
6. The carbon fiber resin-based alloy wind turbine blade according to claim 1, wherein: and the blade injection mold is used for injection molding.
7. The carbon fiber resin-based alloy wind turbine blade according to claim 1, wherein: fishbone type frame (3) adopt the steel welding to form, and fishbone type frame (3) and mount pad (4) welding together, and fishbone type frame (3), mount pad (4) and construction bolt (5) constitute the metal framework of blade.
8. The carbon fiber resin-based alloy wind turbine blade according to claim 7, wherein: the panel (7) is fixed on the surface of the metal framework by a plurality of bolts and special bonding glue, and the connecting gap between the plane plates is filled by the special bonding glue.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210573163.3A CN114893341A (en) | 2022-05-24 | 2022-05-24 | Carbon fiber resin-based alloy wind driven generator blade |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210573163.3A CN114893341A (en) | 2022-05-24 | 2022-05-24 | Carbon fiber resin-based alloy wind driven generator blade |
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| CN114893341A true CN114893341A (en) | 2022-08-12 |
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| CN202210573163.3A Pending CN114893341A (en) | 2022-05-24 | 2022-05-24 | Carbon fiber resin-based alloy wind driven generator blade |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117212041A (en) * | 2023-02-17 | 2023-12-12 | 清新能源科技张家口有限公司 | Blade of wind driven generator |
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2022
- 2022-05-24 CN CN202210573163.3A patent/CN114893341A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117212041A (en) * | 2023-02-17 | 2023-12-12 | 清新能源科技张家口有限公司 | Blade of wind driven generator |
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