CN114953501A - Blade counterweight box manufacturing method and wind power blade - Google Patents
Blade counterweight box manufacturing method and wind power blade Download PDFInfo
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- CN114953501A CN114953501A CN202210474055.0A CN202210474055A CN114953501A CN 114953501 A CN114953501 A CN 114953501A CN 202210474055 A CN202210474055 A CN 202210474055A CN 114953501 A CN114953501 A CN 114953501A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 47
- 239000004744 fabric Substances 0.000 claims abstract description 64
- 239000000835 fiber Substances 0.000 claims abstract description 30
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 20
- 239000011347 resin Substances 0.000 claims abstract description 12
- 229920005989 resin Polymers 0.000 claims abstract description 12
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 4
- 239000011248 coating agent Substances 0.000 claims abstract description 4
- 238000000576 coating method Methods 0.000 claims abstract description 4
- 238000005520 cutting process Methods 0.000 claims abstract description 4
- 239000003292 glue Substances 0.000 claims abstract description 4
- 239000010959 steel Substances 0.000 claims abstract description 4
- 238000003466 welding Methods 0.000 claims abstract description 4
- 230000007423 decrease Effects 0.000 claims description 4
- 238000007711 solidification Methods 0.000 claims description 3
- 230000008023 solidification Effects 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 2
- 238000004026 adhesive bonding Methods 0.000 claims 1
- 238000010248 power generation Methods 0.000 abstract description 3
- 230000002787 reinforcement Effects 0.000 description 4
- 239000002131 composite material Substances 0.000 description 2
- 239000011162 core material Substances 0.000 description 2
- 239000003365 glass fiber Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009787 hand lay-up Methods 0.000 description 1
- 238000009940 knitting Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920005596 polymer binder Polymers 0.000 description 1
- 239000002491 polymer binding agent Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
- B29C70/34—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
-
- 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
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- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Wind Motors (AREA)
Abstract
The invention relates to the field of wind power generation, and discloses a blade counterweight box manufacturing method and a wind power blade. The method comprises the following steps: s1, welding and assembling a plurality of steel plates to form a manufacturing mold of the supporting framework (2); s2, paving a plurality of layers of multi-axial fiber cloth soaked with resin on the manufacturing mould; s3, cutting the plurality of layers of solidified multiaxial fiber cloth according to the designed width to form the supporting framework; s4, paving a bottom reinforcing layer (1) on the surface of the blade shell; s5, coating mold closing glue on the supporting frameworks, and bonding the supporting frameworks on the bottom reinforcing layer at intervals according to a preset distance; s6, laying a plurality of layers of skins (3) on the supporting framework to seal a space surrounded by the supporting framework and the bottom reinforcing layer; s7, paving demolding cloth on the upper surface of the skin; s8, curing the blade shell, the bottom reinforcing layer and the skin. The method is flexible and convenient to operate, and the types of the counterweight box molds can be reduced.
Description
Technical Field
The invention relates to the field of wind power generation, in particular to a method for manufacturing a blade counterweight box. On the basis, the wind power blade is further related.
Background
The wind power generation complete machine generally comprises a cabin, a hub and blades, wherein the blades are parts which enable a wind wheel of the wind power generator to rotate and generate aerodynamic force, and are one of core parts of a horizontal-axis wind power generator, each wind power generator set comprises three blades, the weight of the blades is slightly different due to slight difference of material consumption in each process in the manufacturing process of each blade, and if the three blades are directly hung, the three blades cannot reach dynamic balance in the operation process, and runaway can be caused in the operation process. Therefore, in order to achieve dynamic balance when the three blades operate, the blades with lighter weight are weighted by a weight balancing method. The counterweight is to select three blades with closer weight and gravity center from the blades in a certain range, and the counterweight is placed in the other two blade shells with relatively lighter weight by theoretical calculation on the basis of the blade with the largest weight, so that the mass moment of the three blades reaches the range of the design requirement.
When the blade counterweight is manufactured, a hollow counterweight box is generally placed at a position close to the tip part of the blade in the process of layering or die assembly, and after the blade final assembly process is finished, a counterweight for theoretically calculating the weight is injected into the counterweight box. Along with the development of the blade profile towards upsizing, the counter weight amount of the blade also constantly improves, the size of the counter weight box is also adjusted along with the change, if a blade profile is used for manufacturing a counter weight box mold, the size of an inner cavity of the counter weight box is fixed, only single weight of the counter weight can be balanced, the condition that objects with different weights need to be balanced in the counter weight box exists in the actual counter weight process, if the counter weight boxes with various specifications are manufactured, the counter weight box molds with different specifications need to be manufactured, the manufacturing cost is higher, and the utilization rate of the counter weight box with each specification is not high.
Therefore, the counterweight box is required to be designed into a counterweight box with an adjustable inner cavity so as to meet the requirements of different counterweight weights.
Disclosure of Invention
The invention aims to solve the problem that the counterweight boxes in the prior art are various in types, and provides a blade counterweight box manufacturing method which has the advantage of being suitable for different counterweights.
In order to achieve the above object, one aspect of the present invention provides a method for manufacturing a blade weight cartridge, including the steps of:
s1, welding and assembling a plurality of steel plates according to the overall dimension of the counterweight box to form a manufacturing mold of the support framework;
s2, paving a plurality of layers of multi-axial fiber cloth soaked with resin on the manufacturing mould;
s3, after the plurality of layers of multi-axial fiber cloth are solidified, taking down the plurality of layers of multi-axial fiber cloth from the manufacturing mold, and cutting the plurality of layers of multi-axial fiber cloth according to the designed width to form the supporting framework;
s4, paving a bottom reinforcing layer on the surface of the blade shell, and pouring resin into the blade shell;
s5, coating a mold closing adhesive on the supporting frameworks, and bonding the supporting frameworks on the bottom reinforcing layer at intervals according to a preset distance;
s6, laying multiple layers of skins on the supporting framework, wherein the skins are tightly attached to the supporting framework along with the shape of the supporting framework, and a space enclosed by the supporting framework and the bottom reinforcing layer is sealed;
s7, paving demolding cloth on the upper surface of the skin;
s8, curing the blade shell, the bottom reinforcing layer and the skin.
Optionally, the method for manufacturing a blade weight cartridge further comprises the following steps performed between step S2 and step S3: and S21, laying a vacuum bag film outside the layers of multiaxial fiber cloth to remove redundant resin.
Optionally, the method for manufacturing a blade weight cartridge further comprises the following steps performed between step S21 and step S3: and S22, covering an electric blanket outside the vacuum bag film to accelerate the solidification of the multi-axial fiber cloth layers.
Optionally, the plurality of layers of multi-axial fiber cloth are sequentially arranged into one layer of triaxial cloth and two layers of biaxial cloth from bottom to top.
Optionally, the bottom reinforcing layer is provided with four layers of triaxial cloth, and the extending area of each layer of the triaxial cloth decreases from bottom to top.
Optionally, the skin is sequentially arranged into a layer of triaxial cloth and two layers of biaxial cloth from bottom to top, and the extension area of each layer of triaxial cloth decreases progressively from bottom to top.
Optionally, the support framework comprises a first surface and a second surface which are connected with each other at an angle, and bonding corners respectively connected with the first surface and the second surface, and the mold closing glue is smeared on the bonding corners.
Optionally, in step S6, the skin covers outside the bonding angle, and the maximum outer contour size of the skin is larger than the maximum outer contour size of the support skeleton.
Optionally, the minimum distance between two adjacent support skeletons is 80mm to 120 mm.
The invention provides a wind power blade, which comprises the blade counterweight box obtained by the blade counterweight box manufacturing method.
The counterweight boxes with different inner cavity capacities are obtained by adjusting the number and the spacing of the supporting frameworks, the counterweight boxes obtained by the method are suitable for the requirements of different counterweight amounts of the same blade profile or the requirements of different counterweight amounts of different blade profiles, the application is wide, and the switching of different counterweight boxes due to different counterweight amounts or different blade profiles and the manufacturing of different counterweight box molds are avoided. The manufacturing method of the blade counterweight box is flexible and convenient to operate, can reduce the manufacturing of different counterweight box molds, and reduces the manufacturing cost of the counterweight box.
Drawings
FIG. 1 is an embodiment of a blade weight cartridge resulting from a method of making a blade weight cartridge according to the present invention;
fig. 2 is a schematic view of the support frame of fig. 1.
Description of the reference numerals
1-a bottom reinforcement layer; 2-a framework; 21-a first side; 22-a second face; 23-bonding angle; 3-covering.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
In the present invention, unless otherwise specified, the use of the terms of orientation such as "upper" and "lower" generally refer to the orientation shown in the drawings, and "inner" and "outer" refer to the inner and outer relative to the contour of each component itself.
The invention provides a manufacturing method of a blade counterweight box, which comprises the following steps:
s1, welding and assembling a plurality of steel plates according to the overall dimension of the counterweight box to form a manufacturing mold of the supporting framework 2;
s2, paving a plurality of layers of multi-axial fiber cloth soaked with resin on the manufacturing mould;
s3, after the plurality of layers of multi-axial fiber cloth are solidified, taking down the plurality of layers of multi-axial fiber cloth from the manufacturing mold, and cutting the plurality of layers of multi-axial fiber cloth according to the designed width to form the supporting framework 2;
s4, paving a bottom reinforcing layer 1 on the surface of the blade shell, and pouring resin into the blade shell;
s5, coating mold closing glue on the supporting frameworks 2, and bonding the supporting frameworks 2 on the bottom reinforcing layer 1 at intervals according to a preset distance;
s6, laying a plurality of layers of skins 3 on the supporting framework 2, wherein the skins 3 are tightly attached to the supporting framework 2 along with the shape, and a space enclosed by the supporting framework 2 and the bottom reinforcing layer 1 is sealed;
s7, paving demolding cloth on the upper surface of the skin 3;
s8, solidifying the blade shell, the bottom reinforcing layer 1 and the skin 3.
The counterweight boxes with different inner cavity capacities are obtained by adjusting the number and the spacing of the supporting frameworks 2, the counterweight boxes obtained by the method are suitable for the requirements of different counterweight amounts of the same blade profile or the requirements of different counterweight amounts of different blade profiles, the application is wide, and the switching of different counterweight boxes due to different counterweight amounts or different blade profiles and the manufacturing of different counterweight box molds are avoided. The manufacturing method of the blade counterweight box is flexible and convenient to operate, can reduce the manufacturing of different counterweight box molds, and reduces the manufacturing cost of the counterweight box.
In step S2, a plurality of layers of multiaxial fiber cloth may be laid on the production mold by hand lay-up. In S4, the bottom reinforcement layer 1 is used to provide a solid bottom for the weight box, and the size of the bottom reinforcement layer 1 is larger than the projection size of the skin 3 on the bottom reinforcement layer 1, and in S4, the glass fiber and the core material are laid on the shell mold, and then the shell mold is sealed by a vacuum bag film, and after evacuation, resin is poured, and the resin slowly soaks the glass fiber. At S7, the release fabric is used to provide a rough, clean working surface for subsequent bonding to the shell.
In addition, the multiaxial fiber cloth (also called multiaxial cloth or axial cloth) refers to a composite material which is formed by laying two or more layers of parallel fibers in different directions and consolidating the fibers with a polyester fiber knitting or a polymer binder (or both). The axial cloth combines a plurality of layers of reinforced fibers together, and can conveniently, quickly and accurately form a layer of the composite material. In addition, the multiaxial cloth has better tensile, bending and compression resistance. Typical orientations of the multiaxial fabric fiber layers are 0 °, 90 ° +45 ° and-45 °, with standard configurations being biaxial (0 °, 90 °), biaxial (± 45 °), warp triaxial (0 °, ± 45 °), weft triaxial (90 °, ± 45 °) and tetraaxial (0 °, 90 °, ± 45 °).
Further, the method for manufacturing the blade weight cartridge further comprises the following steps executed between the step S2 and the step S3: and S21, laying a vacuum bag film outside the layers of multiaxial fiber cloth to remove redundant resin. As an embodiment, especially in case of low winter temperature, the method further comprises the following steps performed between step S21 and step S3: and S22, covering an electric blanket outside the vacuum bag film to accelerate the solidification of the multi-axial fiber cloth layers. It is to be understood that step S22 may not be required in the case where the summer air temperature is high.
In one embodiment of the invention, the plurality of layers of multiaxial fiber cloth are sequentially arranged into a layer of triaxial cloth and two layers of biaxial cloth from bottom to top; the bottom reinforcing layer 1 is provided with four layers of triaxial cloth, and the extension area of each layer of the triaxial cloth is gradually reduced from bottom to top; the skin 3 is sequentially provided with a layer of triaxial cloth and two layers of biaxial cloth from bottom to top, and the extension area of each layer of triaxial cloth decreases progressively from bottom to top.
Further, as shown in fig. 2, the supporting framework 2 includes a first surface 21, a second surface 22 connected with each other at an angle, and a bonding angle 23 connected with the first surface 21 and the second surface 22, respectively, and the mold compound is applied on the bonding angle 23. Further, in step S6, the skin 3 covers the outside of the bonding corner 23, and the maximum outer contour size of the skin 3 is larger than the maximum outer contour size of the support frame 2. It will be appreciated that in the method described, the skin 3 needs to completely cover the support skeleton 2. As an embodiment, the minimum distance between two adjacent support skeletons 2 may be 80mm to 120 mm.
As shown in fig. 1, as an embodiment, the weight box is provided as a column having a triangular section. The height from the top point of the supporting framework 2 to the bottom reinforcing layer 1 is 150mm, and the maximum distance between two bonding angles 23 of the supporting framework 2 is 300 mm; the width of the supporting framework 2 is 80 mm. The counter weight box includes 3 support skeletons 2, and the minimum distance between two adjacent support skeletons 2 is 100 mm. The bottom reinforcing layer 1 consists of 4 layers of triaxial cloth, the length of the triaxial cloth at the bottommost layer is 600mm, the width of the triaxial cloth is 550mm, and each edge of each layer upwards contracts inwards by 10mm from the bottommost layer. The covering 3 is composed of 1 layer of triaxial cloth and 2 layers of biaxial cloth, the bottommost layer is the triaxial cloth, the length is 800mm, the width is 600mm, two layers of biaxial cloth are arranged on the triaxial cloth, and each edge of each layer contracts 10mm inwards.
It will be appreciated that in other embodiments, the support frames 2 of any width, the number of the support frames 2 and the distance between two adjacent support frames 2 may be selected to form weight boxes with different inner cavity capacities, which are suitable for different types of blades.
The invention provides a wind power blade, which comprises the blade counterweight box obtained by the blade counterweight box manufacturing method. Compared with the prior art, the wind power blade and the blade counterweight box manufacturing method have the same advantages, and are not described again.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, numerous simple modifications can be made to the technical solution of the invention, including combinations of the specific features in any suitable way, and the invention will not be further described in relation to the various possible combinations in order to avoid unnecessary repetition. Such simple modifications and combinations should be considered within the scope of the present disclosure as well.
Claims (10)
1. A manufacturing method of a blade counterweight box is characterized by comprising the following steps:
s1, welding and assembling a plurality of steel plates according to the overall dimension of the counterweight box to form a manufacturing mold of the supporting framework (2);
s2, paving a plurality of layers of multi-axial fiber cloth soaked with resin on the manufacturing mould;
s3, after the plurality of layers of multi-axial fiber cloth are solidified, taking down the plurality of layers of multi-axial fiber cloth from the manufacturing mold, and cutting the plurality of layers of multi-axial fiber cloth according to the designed width to form the supporting framework (2);
s4, paving a bottom reinforcing layer (1) on the surface of the blade shell, and pouring resin into the blade shell;
s5, coating mold closing glue on the supporting frameworks (2), and bonding a plurality of supporting frameworks (2) on the bottom reinforcing layer (1) at intervals according to a preset distance;
s6, laying multiple layers of skins (3) on the supporting framework (2), wherein the skins (3) are tightly attached to the supporting framework (2) along with the shape, and a space enclosed by the supporting framework (2) and the bottom reinforcing layer (1) is sealed;
s7, paving demolding cloth on the upper surface of the skin (3);
s8, solidifying the blade shell, the bottom reinforcing layer (1) and the skin (3).
2. The method of fabricating a blade weight cartridge according to claim 1, further comprising the following steps performed between steps S2 and S3:
and S21, laying a vacuum bag film outside the layers of multiaxial fiber cloth to remove redundant resin.
3. The method of fabricating a blade weight cartridge according to claim 2, further comprising the following steps performed between steps S21 and S3:
and S22, covering an electric blanket outside the vacuum bag film to accelerate the solidification of the multi-axial fiber cloth layers.
4. The method for manufacturing a blade weight box according to claim 1, wherein the plurality of layers of multi-axial fiber cloth are sequentially arranged into a layer of three-axial cloth and a layer of two-axial cloth from bottom to top.
5. The manufacturing method of the blade counterweight box according to claim 1, characterized in that the bottom reinforcing layer (1) is provided with four layers of triaxial cloth, and the extension area of each layer of the triaxial cloth is gradually reduced from bottom to top.
6. The manufacturing method of the blade counterweight box according to claim 1, characterized in that the skin (3) is sequentially provided with a layer of triaxial cloth and two layers of biaxial cloth from bottom to top, and the extension area of each layer of triaxial cloth decreases from bottom to top.
7. A blade weight box manufacturing method according to claim 1, wherein the supporting framework (2) comprises a first face (21), a second face (22) and a bonding angle (23) which are connected with the first face (21) and the second face (22) at an angle, and the mold compound is coated on the bonding angle (23).
8. Method for producing a blade weight box according to claim 7, wherein in step S6, the skin (3) is covered outside the gluing corner (23) and the maximum outer contour dimension of the skin (3) is larger than the maximum outer contour dimension of the support frame (2).
9. A method for manufacturing a blade weight cartridge according to claim 1, wherein the minimum distance between two adjacent support skeletons (2) is 80mm to 120 mm.
10. A wind power blade characterized by comprising a blade weight box obtained by the blade weight box manufacturing method according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210474055.0A CN114953501A (en) | 2022-04-29 | 2022-04-29 | Blade counterweight box manufacturing method and wind power blade |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210474055.0A CN114953501A (en) | 2022-04-29 | 2022-04-29 | Blade counterweight box manufacturing method and wind power blade |
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| CN114953501A true CN114953501A (en) | 2022-08-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210474055.0A Pending CN114953501A (en) | 2022-04-29 | 2022-04-29 | Blade counterweight box manufacturing method and wind power blade |
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Citations (6)
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|---|---|---|---|---|
| US3237697A (en) * | 1963-02-11 | 1966-03-01 | Boeing Co | Helicopter rotor blade |
| RU2541574C1 (en) * | 2013-12-25 | 2015-02-20 | Закрытое акционерное общество "АВИА-ПРОЕКТ" | Helicopter rotor and production of rotor from composites |
| CN104613128A (en) * | 2014-12-10 | 2015-05-13 | 洛阳双瑞风电叶片有限公司 | Balancing weight for wind-power blade |
| CN209228546U (en) * | 2018-08-28 | 2019-08-09 | 国电联合动力技术(保定)有限公司 | A kind of wind electricity blade counterweight cabin tooling |
| CN110562450A (en) * | 2019-09-17 | 2019-12-13 | 深圳市中科金朗产业研究院有限公司 | helicopter rotor structure and manufacturing method thereof |
| CN212498544U (en) * | 2020-06-15 | 2021-02-09 | 国电联合动力技术(保定)有限公司 | Wind-powered electricity generation blade counter weight box formpiston |
-
2022
- 2022-04-29 CN CN202210474055.0A patent/CN114953501A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3237697A (en) * | 1963-02-11 | 1966-03-01 | Boeing Co | Helicopter rotor blade |
| RU2541574C1 (en) * | 2013-12-25 | 2015-02-20 | Закрытое акционерное общество "АВИА-ПРОЕКТ" | Helicopter rotor and production of rotor from composites |
| CN104613128A (en) * | 2014-12-10 | 2015-05-13 | 洛阳双瑞风电叶片有限公司 | Balancing weight for wind-power blade |
| CN209228546U (en) * | 2018-08-28 | 2019-08-09 | 国电联合动力技术(保定)有限公司 | A kind of wind electricity blade counterweight cabin tooling |
| CN110562450A (en) * | 2019-09-17 | 2019-12-13 | 深圳市中科金朗产业研究院有限公司 | helicopter rotor structure and manufacturing method thereof |
| CN212498544U (en) * | 2020-06-15 | 2021-02-09 | 国电联合动力技术(保定)有限公司 | Wind-powered electricity generation blade counter weight box formpiston |
Non-Patent Citations (1)
| Title |
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| 邢瑞山;: "飞机调整片湿铺层成型工艺", 科技信息, no. 19, 5 July 2013 (2013-07-05) * |
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