CN111042997B - Method for repairing major structural damage reinforcement of main beam of wind turbine blade - Google Patents
Method for repairing major structural damage reinforcement of main beam of wind turbine blade Download PDFInfo
- Publication number
- CN111042997B CN111042997B CN201911326171.2A CN201911326171A CN111042997B CN 111042997 B CN111042997 B CN 111042997B CN 201911326171 A CN201911326171 A CN 201911326171A CN 111042997 B CN111042997 B CN 111042997B
- Authority
- CN
- China
- Prior art keywords
- main beam
- unidirectional cloth
- prepreg
- cloth
- blade
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 41
- 230000002787 reinforcement Effects 0.000 title claims abstract description 14
- 239000004744 fabric Substances 0.000 claims abstract description 152
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 30
- 230000008439 repair process Effects 0.000 claims abstract description 18
- 239000010410 layer Substances 0.000 claims description 154
- 239000000835 fiber Substances 0.000 claims description 21
- 230000002457 bidirectional effect Effects 0.000 claims description 16
- 239000003365 glass fiber Substances 0.000 claims description 13
- 239000003973 paint Substances 0.000 claims description 12
- 239000011248 coating agent Substances 0.000 claims description 8
- 238000000576 coating method Methods 0.000 claims description 8
- 229920005989 resin Polymers 0.000 claims description 8
- 239000011347 resin Substances 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 6
- 238000005498 polishing Methods 0.000 claims description 5
- 239000003822 epoxy resin Substances 0.000 claims description 4
- 239000011159 matrix material Substances 0.000 claims description 4
- 229920000647 polyepoxide Polymers 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000005728 strengthening Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 2
- 239000002344 surface layer Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 4
- 238000003825 pressing Methods 0.000 abstract description 4
- 238000012423 maintenance Methods 0.000 description 12
- 238000005086 pumping Methods 0.000 description 6
- 239000002390 adhesive tape Substances 0.000 description 5
- 239000003292 glue Substances 0.000 description 4
- 238000000227 grinding Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000113 differential scanning calorimetry Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000004922 lacquer Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
Images
Classifications
-
- 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
- F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
- F03D80/50—Maintenance or repair
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2230/00—Manufacture
- F05B2230/80—Repairing, retrofitting or upgrading methods
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2240/00—Components
- F05B2240/20—Rotors
- F05B2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Working Measures On Existing Buildindgs (AREA)
Abstract
The invention discloses a method for repairing the reinforcement of a main beam of a wind turbine blade, which aims at the major structural damage of the main beam of the blade, wherein the number of damaged layers of unidirectional cloth of the main beam of the blade exceeds 10, adopts double-lap joint patching reinforcement repair: namely, a double-lap repairing repair method is adopted according to the damaged part. And after the painted surface, the skin layer and the plurality of layers of main beam unidirectional cloth laying layers are polished, backfilling corresponding layers of unidirectional cloth of prepreg lap joint sections, and reinforcing the unidirectional cloth and the outer skin layer by the plurality of layers of prepregs. The backfill lap joint section unidirectional cloth and the reinforcement unidirectional cloth adopt prepreg materials, and the reinforcement repair process is a vacuum bag pressing forming method. The invention recovers the continuous safe operation capability of the blade which is possibly broken at any time, breaks through the technical problem of repairing the main beam of the blade and provides a new method for maintaining and repairing the blade of the wind turbine.
Description
Technical Field
The invention relates to the technical field of wind turbine blades, in particular to a method for repairing major structural damage of a main beam of a wind turbine blade.
Background
Wind turbines are often operated in seas or remote mountaintop fields, and the environment is harsh. Wind generating sets operating in certain areas of China are subject to harsher environmental conditions, such as typhoons frequently occurring in coastal areas of southeast, low temperatures in winter in northern China, and the like. The wind turbine operated at present can not be completely adapted to the climate conditions of China, so that the damage and the fault of wind power equipment occur. The blade is one of key parts in the wind generating set, and the good design, the reliable quality and the superior performance of the blade are determining factors for ensuring the normal and stable operation of the set. Accordingly, the level of quality in the design and manufacture of wind turbine blades is of great importance and is considered a key milestone-type component of wind power generation systems. The main beam is a main bearing component of the blade structure, and the good strength and rigidity characteristics of the main beam are main technical indexes of the blade structure design.
With the increasing length of the blade and the increase of the weight of the blade, the wind power blade, although being designed to have enough strength and rigidity, has various problems in the service life of 20 years like other composite material components. Blade manufacturers generally give 3-5 years of quality guarantee period to the produced blades, but by integrating information of the blade manufacturers, host manufacturers, wind power plants and the like, due to immaturity of blade technology in early stage in China and no perfect maintenance system for the blades, defects hidden inside the blades are gradually revealed and broken under the action of wind pressure and rotary continuous fatigue load after the quality guarantee period of a large number of existing blades. At present, a large number of blades with breaking problems in a wind power plant are early products in China, blade manufacturers are already on the market to continue production, and the cost for re-customizing the blades of the whole unit (total 3 blades) is high, and the period is long. The difficulty of repairing the blade lies in repairing the damage of the main beam, but at present, a mature repairing method for major structural damage of the main beam does not exist at home and abroad.
Disclosure of Invention
The invention aims to provide a method for repairing the major structural damage of a main beam of a wind turbine blade, which solves the blank in the prior art and breaks through the technical problem of maintenance of the main beam of the wind turbine blade.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
a strengthening repair method for major structural damage of a main beam of a wind turbine blade is disclosed, wherein the strengthening repair method comprises the following steps: the method comprises the following steps:
step one, finding out a major structural damage position of a main beam of a wind turbine blade, and polishing a paint surface layer and an original outer skin layer of the main beam of the blade along the blade extension direction by taking the position as a center until the main beam unidirectional cloth is polished;
step two, removing a plurality of layers of main beam one-way cloth at the main beam damage part of the wind turbine blade in a two-way staggered lap joint mode along the blade extension direction, so that a step-shaped pit is formed at the main beam damage part of the wind turbine blade;
step three, backfilling prepreg lapping section unidirectional cloth with the same number of layers, wherein the size of the prepreg lapping section unidirectional cloth of each layer is exactly the same as that of the removed main beam unidirectional cloth of the corresponding layer, and the prepreg lapping section unidirectional cloth forms a step-shaped pit position on the damaged part of the main beam of the wind turbine blade to be filled and leveled;
step four, laying a plurality of layers of prepreg reinforcing unidirectional cloth completely covering the prepreg lap joint section unidirectional cloth outside the prepreg lap joint section unidirectional cloth, wherein the lengths of the plurality of layers of prepreg reinforcing unidirectional cloth are gradually increased from bottom to top along the blade extension direction or along the blade extension direction and the blade chord length direction, so that the prepreg reinforcing unidirectional cloth on the upper layer completely covers the prepreg reinforcing unidirectional cloth on the lower layer;
step five, continuously vacuumizing the major structural damage position of the main beam of the wind turbine blade in the step three and the step four, so that the processes of backfilling the prepreg lap joint section unidirectional cloth and laying the prepreg reinforcing unidirectional cloth are carried out in a vacuum environment;
step six, laying a skin layer outside the prepreg reinforcing unidirectional cloth, wherein the skin layer completely covers the prepreg reinforcing unidirectional cloth; and coating a paint surface outside the skin layer, and finishing the reinforcement of major structural damage of the main beam of the wind turbine blade after the prepreg lap joint section unidirectional cloth and the prepreg reinforcement unidirectional cloth are cured.
In order to optimize the technical scheme, the specific measures adopted further comprise:
and in the second step, four layers of main beam unidirectional cloth at the damaged part of the main beam of the wind turbine blade are removed in a bidirectional staggered lapping mode along the blade extension direction, correspondingly, in the third step, four layers of prepreg lapping section unidirectional cloth are backfilled, and in the fourth step, eight layers of prepreg reinforcing unidirectional cloth are laid outside the prepreg lapping section unidirectional cloth.
The skin layer comprises two layers of biaxial fiber cloth and one layer of triaxial fiber cloth which are stacked from bottom to top, and the three layers of fiber cloth completely cover the next layer of fiber cloth in sequence.
When the covering layer and the paint coating surface are laid outside the prepreg reinforced unidirectional cloth, the position of the major structural damage of the wind turbine blade main beam is continuously vacuumized, so that the process of laying the covering layer and the paint coating surface is carried out in a vacuum environment.
After all the fiber cloth is cured, according to the polished size of the fiber cloth at the damaged part, putty with a certain mass is mixed according to the proportion of 100:33, the putty is evenly spread on the surface of the fiber cloth, a heating blanket is used for assisting the putty in curing, the primary curing is ensured at 50 ℃, the time is 4 hours, and the secondary curing is ensured at 50 ℃, the time is 8 hours.
The prepreg lapping section unidirectional cloth and the prepreg reinforcing unidirectional cloth adopt toughened modified epoxy resin as matrix resin, the resin content is 32% +/-3.0, alkali-free E glass fiber, and the unit area mass of the glass fiber is 1600g of unidirectional glass fiber prepreg.
The major structural damage of the main beam of the wind turbine blade is that the number of damaged layers of the unidirectional cloth of the main beam of the blade exceeds 10.
Aiming at the major structural damage of the blade girder, the number of damaged unidirectional cloth layers exceeds 10, the invention adopts a double-lap-joint patching reinforcement repairing method of '4 +8+ 3': according to the damage position promptly, 4 layers of preimpregnation material overlap joint section unidirectional cloth are backfilled behind lacquer painting, skin layer and the unidirectional cloth of 4 layers of girder shop layers, 8 layers of preimpregnation material reinforcement unidirectional cloth and 3 layers of outer skin layer: 2 layers of biaxial fiber cloth and 1 layer of triaxial fiber cloth.
The double-lap-joint patching reinforcing repair method can effectively improve the strength and rigidity of a major structural damage part of the blade main beam, so that the blade main beam can be recovered to be normally used.
The invention relates to a double-lap patch repairing method, which removes a damaged area by adopting a bidirectional staggered-layer lap joint mode according to a damaged position. The specific overlapping size is changed based on different layering forms, the overlapping size along the length direction of the blade is controlled to be 50-100mm generally, and the overlapping size along the chord direction of the blade is 0-15 mm. The joint strength between adjacent layers can be effectively improved by adopting the bidirectional staggered-layer lap joint, and the joint firmness of the prepreg lap joint section unidirectional cloth and the prepreg reinforcing unidirectional cloth is improved.
When the prepreg lap joint section unidirectional cloth and the prepreg reinforcing unidirectional cloth are laid, the working environment needs to be vacuumized, the prepreg lap joint section unidirectional cloth and the prepreg reinforcing unidirectional cloth laid by the invention adopt a vacuum bag pressing and forming method, so that air is not mixed in each layer of prepreg unidirectional cloth, and each layer of unidirectional cloth is firmly connected.
The prepreg lapping section unidirectional cloth and the prepreg reinforcing unidirectional cloth adopt toughened modified epoxy resin as matrix resin, the resin content is 32% +/-3.0, alkali-free E glass fiber is adopted, and the unit area mass of the glass fiber is 1600g of unidirectional glass fiber prepreg, so that the prepreg has good wettability and mechanical property.
Drawings
FIG. 1 is a schematic view of a main blade beam and a damaged position of a wind turbine blade;
FIG. 2 is a schematic diagram of a double lap patch repair model;
FIG. 3 is a schematic view of a damaged grinding area of a main beam;
FIG. 4 is a schematic diagram showing the sizes of overlapping staggered layers of different layers of a damaged area along the spanwise direction and chordwise direction of a blade;
FIG. 5 is a schematic view of a layer repair sequence after polishing a damaged area of a main beam.
The label names in the figure: 1-blade main beam, 2-main beam damaged area, 3-original undamaged area, 4-repair patch, 5-lap joint size, 6-main beam damaged first layer of unidirectional cloth, 7-main beam damaged second layer of unidirectional cloth, 8-main beam damaged third layer of unidirectional cloth, 9-main beam damaged fourth layer of unidirectional cloth, 10-polished painted surface area, 11-layer lapping and staggering size along length direction, 12-layer lapping and staggering size along chord length direction, 13-backfill first layer of unidirectional cloth, 14-backfill second layer of unidirectional cloth, 15-backfill third layer of unidirectional cloth, 16-backfill fourth layer of unidirectional cloth, 17-first layer of reinforced unidirectional cloth, 18-second layer of reinforced unidirectional cloth, 19-third layer of reinforced unidirectional cloth, 20-fourth layer of reinforced unidirectional cloth, 21-fifth layer of reinforced unidirectional cloth, 22-sixth layer of reinforced unidirectional cloth, 23-seventh layer of reinforced unidirectional cloth, 24-eighth layer of reinforced unidirectional cloth, 25-first layer of outer skin layer, 26-second layer of outer skin layer, 27-third layer of outer skin layer, and 28-putty and finish surface repair.
Detailed Description
Embodiments of the present invention are described in further detail below with reference to the accompanying drawings.
Referring to fig. 1 in this embodiment, a main beam is a very important load-bearing structural member 1 of a wind turbine blade, and the invention provides a reinforcing repair method for a main beam damage, aiming at a major structural damage 2 of a blade main beam with a damaged unidirectional fabric layer number exceeding 10.
Referring to fig. 2, the girder reinforcement is a double-lap patch repair method, and a damaged area is removed in a bidirectional staggered-layer lap joint mode according to a damaged position. The original undamaged area 3 is not damaged as much as possible, the dimension of a bidirectional patch 5 used for removing the damage along the length direction of the blade is 100mm, and the repair layer used after removing the damaged area is collectively called a repair patch 4.
Referring to fig. 3, the double-lap patch repair repairing method mainly aims at the unidirectional cloth laying of the main beam of the blade, the polishing staggered layers of 4 layers of unidirectional cloth removed along the blade spreading direction are 100 mm/layer, and the polishing width of the unidirectional cloth along the blade chord length direction is consistent with the damage width of the main beam; the length of the first layer of unidirectional cloth 6 of the girder damage grinding is 200mm, and the girder damage grinding is symmetrical grinding along the damage area; the length of the second layer of unidirectional cloth 7 which is damaged and polished by the main beam is 400mm, and after the first layer is polished, the two sides of the first layer are polished by 100mm respectively along the length direction; the length of the third layer of unidirectional cloth 8 which is damaged and polished by the main beam is 600mm, and the two sides of the second layer of unidirectional cloth are polished by 100mm along the length direction respectively after being polished; the length of the fourth layer of unidirectional cloth 9 damaged and polished by the main beam is 800mm, and the two sides of the third layer of unidirectional cloth are polished by 100mm along the length direction respectively after being polished; meanwhile, to polish the blade paint surface 10 and the skin layer, the paint surface and the skin layer may be gradually polished layer by layer.
Referring to fig. 4, the blade girder reinforcing repair method comprises backfilling 4 layers of prepreg lap joint section unidirectional cloth and 8 layers of prepreg reinforcing unidirectional cloth. The unidirectional glass fiber prepreg adopts toughened and modified epoxy resin as matrix resin, the resin content is 32 +/-3.0, alkali-free E glass fibers are adopted, and the unit area mass of the glass fibers is 1600g, so that the unidirectional glass fiber prepreg has good wettability and mechanical properties. The backfilled 4 layers of unidirectional cloth layers are lapped by 100mm along the blade extension direction 11, and the reinforced 8 layers of unidirectional cloth and 3 layers of outer covering layer layers are lapped by 50mm along the blade extension direction 11; the layers of the backfilled 4 layers of unidirectional cloth are overlapped by 0mm along the chord length direction of the blade in a 12-lap joint mode, and the layers of the reinforced 8 layers of unidirectional cloth and the layers of the outer skin layers of the reinforced 3 layers are overlapped by 15mm along the chord length direction of the blade in a 12-lap joint mode.
Referring to fig. 5, after removing the 4 layers of unidirectional cloth in the damaged area of the blade main beam, repairing the damage of the blade main beam is started. The sequence of layer-by-layer repair is as follows: 4 layers of backfill unidirectional cloth, 8 layers of reinforcement unidirectional cloth, 3 layers of outer skin layers and the surface of finish paint. Wherein:
1)4 layers of backfill unidirectional cloth: the length of the backfill first layer of unidirectional cloth 13 is 200mm, and the backfill first layer of unidirectional cloth is lapped in the direction without chord length; the length of the backfill second layer of unidirectional cloth 14 is 400mm, and the backfill second layer of unidirectional cloth is not overlapped in the chord length direction; the length of the backfilled third layer of unidirectional cloth 15 is 600mm, and the third layer of unidirectional cloth is not overlapped in the chord length direction; the length of the backfilled fourth layer of unidirectional cloth is 800mm, and the backfilled fourth layer of unidirectional cloth is lapped in the direction without chord length;
2) the length of the first layer of reinforced unidirectional cloth 17 is 900mm, and the chord length direction is in bidirectional lap joint with 15 mm; the length of the second layer of reinforced unidirectional cloth 18 is 1000mm, and the chord length direction is in bidirectional lap joint with 15 mm; the length of the third layer of reinforced unidirectional cloth 19 is 1100mm, and the chord length direction is in bidirectional lap joint with 15 mm; the length of the fourth layer of reinforcing unidirectional cloth 20 is 1200mm, and the chord length direction is in bidirectional lap joint with 15 mm; the length of the fifth layer of reinforced unidirectional cloth 21 is 1300mm, and the chord length direction is in bidirectional lap joint with 15 mm; the length of the sixth layer of reinforcing unidirectional cloth 22 is 1400mm, and the chord length direction is in bidirectional lap joint with 15 mm; the length of the seventh layer of reinforced unidirectional cloth 23 is 1500mm, and the chord length direction is in bidirectional lap joint with 15 mm; the length of the eighth layer of reinforcing unidirectional cloth 24 is 1600mm, and the chord length direction is in bidirectional lap joint with 15 mm;
3)3 outer skin layers: the first outer skin layer 25 is biaxial fiber cloth, the laying length is 1700mm, and the chord length direction is in bidirectional lap joint by 15 mm; the second outer skin layer 26 is biaxial fiber cloth, the laying length is 1800mm, and the chord length direction is in two-way lap joint by 15 mm; the first outer skin layer 27 is triaxial fiber cloth, the laying length is 1900mm, and the chord length direction is in bidirectional lap joint for 15 mm;
4) surface of finish paint: after all plies are cured, a putty and finish surface 28 treatment is required. Mixing putty with a certain mass according to the proportion of 100:33, uniformly coating the putty on the surface of the fiber cloth, and utilizing a heating blanket to assist in curing, wherein the primary curing is ensured at 50 ℃ for 4 hours, and the secondary curing is ensured at 50 ℃ for 8 hours.
The curing and forming method of all layers of the main beam repair is vacuum bag pressing, demolding cloth and porous membranes are fully laid on the cloth layers, and then a vacuum air pumping system is arranged according to the arrangement requirements of the corresponding flow guide net and the vacuum tube. And (4) according to the requirement of the vacuum bag pressure maintenance process, starting a vacuum pump, pumping the vacuum degree to be below 40mbar and continuously maintaining the pressure. And keeping the vacuum pump in an air exhaust state all the time. The vacuum bag pressing operation has the following principles:
(1) the vacuum adhesive tape is paved to be more than 100mm far away from the outermost fiber cloth layer as far as possible.
(2) The adhesive absorption felt is used as an air guide channel, is laid around the maintenance area for a circle, is not contacted with the cloth layer, and is connected to the air suction port. The cloth layer is connected with the adhesive tape absorbing channel through adhesive tape absorbing strips, the distance between the adhesive tape absorbing strips is about 0.5-1m, and the adhesive tape absorbing strips are uniformly distributed.
(3) The demolding cloth covers the whole maintenance area, and if the surface cleanness and sanitation of the adjacent area are not influenced, the demolding cloth covers the area where the glue solution reaches as much as possible.
(4) In order to ensure the glue content of hand-pasting in the maintenance area, a flow guide net is not laid as much as possible, a layer of waste vacuum film is laid on the demolding cloth, and then a Z-shaped glue absorption felt is placed on the waste vacuum film to guide air.
(5) And arranging a vacuum air pumping system, wherein the air pumping ports are uniformly arranged in principle, and the number of the air pumping ports is not less than 2. The pumping hole can be increased according to the maintenance length. Optionally, if the maintenance occurs at a location spaced from the edge of the mold, the mold vacuum system may be used to evacuate the mold. The air exhaust pipeline is connected to the vacuum pump, and in order to reduce the phenomenon that the air exhaust pipeline enters the glue and returns to the vacuum pump, a plurality of air exhaust pipelines can be connected by using a tee joint to form a single air exhaust pipeline connected to the vacuum pump.
(6) Covering and fixing the maintenance area by using an electric heating blanket, adjusting the electric heating blanket to 50 ℃, carrying out primary curing for 3 hours, and then carrying out secondary curing for 3 hours above 80 ℃. And checking the curing condition at any time during the curing process, and recording the curing temperature and filling the curing temperature in a curing record form as a part of maintenance records.
(7) After the maintenance and curing are finished, quality inspectors determine and confirm according to relevant inspection standards of the main beam, a Shore hardness tester is used for measuring the hardness to be more than 70HD, the maintenance and curing are confirmed to meet requirements, and finally, differential scanning calorimetry (Tg) is used for confirming the curing degree of the material.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.
Claims (7)
1. A strengthening repair method for major structural damage of a main beam of a wind turbine blade is characterized by comprising the following steps: the method comprises the following steps:
step one, finding out a major structural damage position of a main beam of a wind turbine blade, and polishing a paint surface layer and an original outer skin layer of the main beam of the blade along the blade extension direction by taking the position as a center until the main beam unidirectional cloth is polished;
step two, removing a plurality of layers of main beam one-way cloth at the main beam damage part of the wind turbine blade in a two-way staggered lap joint mode along the blade extension direction, so that a step-shaped pit is formed at the main beam damage part of the wind turbine blade;
step three, backfilling prepreg lapping section unidirectional cloth with the same number of layers, wherein the size of the prepreg lapping section unidirectional cloth of each layer is exactly the same as that of the removed main beam unidirectional cloth of the corresponding layer, and the prepreg lapping section unidirectional cloth forms a step-shaped pit position on the damaged part of the main beam of the wind turbine blade to be filled and leveled;
step four, laying a plurality of layers of prepreg reinforcing unidirectional cloth completely covering the prepreg lap joint section unidirectional cloth outside the prepreg lap joint section unidirectional cloth, wherein the lengths of the plurality of layers of prepreg reinforcing unidirectional cloth are gradually increased from bottom to top along the blade extension direction or along the blade extension direction and the blade chord length direction, so that the prepreg reinforcing unidirectional cloth on the upper layer completely covers the prepreg reinforcing unidirectional cloth on the lower layer;
step five, continuously vacuumizing the major structural damage position of the main beam of the wind turbine blade in the step three and the step four, so that the processes of backfilling the prepreg lap joint section unidirectional cloth and laying the prepreg reinforcing unidirectional cloth are carried out in a vacuum environment;
step six, laying a skin layer outside the prepreg reinforcing unidirectional cloth, wherein the skin layer completely covers the prepreg reinforcing unidirectional cloth; and coating a paint surface outside the skin layer, and finishing the reinforcement of major structural damage of the main beam of the wind turbine blade after the prepreg lap joint section unidirectional cloth and the prepreg reinforcement unidirectional cloth are cured.
2. The method for repairing the major structural damage of the main beam of the wind turbine blade as claimed in claim 1, wherein the method comprises the following steps: and in the second step, four layers of main beam unidirectional cloth at the damaged part of the main beam of the wind turbine blade are removed in a bidirectional staggered lapping mode along the blade extension direction, correspondingly, in the third step, four layers of prepreg lapping section unidirectional cloth are backfilled, and in the fourth step, eight layers of prepreg reinforcing unidirectional cloth are laid outside the prepreg lapping section unidirectional cloth.
3. The method for repairing the major structural damage of the main beam of the wind turbine blade as claimed in claim 2, wherein the method comprises the following steps: the skin layer comprises two layers of biaxial fiber cloth and one layer of triaxial fiber cloth which are stacked from bottom to top, and the three layers of fiber cloth completely cover the next layer of fiber cloth in sequence.
4. The method for repairing the major structural damage of the main beam of the wind turbine blade as claimed in claim 3, wherein the method comprises the following steps: when the covering layer and the paint coating surface are laid outside the prepreg reinforced unidirectional cloth, the position of the major structural damage of the wind turbine blade main beam is continuously vacuumized, so that the process of laying the covering layer and the paint coating surface is carried out in a vacuum environment.
5. The method for repairing the major structural damage of the main beam of the wind turbine blade as claimed in claim 4, wherein the method comprises the following steps: and step four, before the step five, after all the fiber cloth is cured, mixing putty with a certain mass according to the size of the polished fiber cloth at the damaged part according to the proportion of 100:33, uniformly coating the putty on the surface of the fiber cloth, and using a heating blanket to assist the curing of the putty, so as to ensure that the primary curing is carried out at 50 ℃, for 4 hours, and the secondary curing is carried out at 50 ℃ for 8 hours.
6. The method for repairing the major structural damage of the main beam of the wind turbine blade as claimed in claim 5, wherein the method comprises the following steps: the prepreg lapping section unidirectional cloth and the prepreg reinforcing unidirectional cloth adopt toughened modified epoxy resin as matrix resin, the resin content is 32% +/-3.0, alkali-free E glass fiber, and the unit area mass of the glass fiber is 1600g of unidirectional glass fiber prepreg.
7. The method for repairing the major structural damage of the main beam of the wind turbine blade as claimed in claim 6, wherein the method comprises the following steps: the major structural damage of the main beam of the wind turbine blade is that the number of damaged layers of the unidirectional cloth of the main beam of the blade exceeds 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911326171.2A CN111042997B (en) | 2019-12-20 | 2019-12-20 | Method for repairing major structural damage reinforcement of main beam of wind turbine blade |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911326171.2A CN111042997B (en) | 2019-12-20 | 2019-12-20 | Method for repairing major structural damage reinforcement of main beam of wind turbine blade |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111042997A CN111042997A (en) | 2020-04-21 |
| CN111042997B true CN111042997B (en) | 2021-01-26 |
Family
ID=70238085
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911326171.2A Active CN111042997B (en) | 2019-12-20 | 2019-12-20 | Method for repairing major structural damage reinforcement of main beam of wind turbine blade |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111042997B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021242158A1 (en) * | 2020-05-26 | 2021-12-02 | Kjell Lindskog | Arrangement for work on blades or wings at a wind turbine |
| CN112373072B (en) * | 2020-10-23 | 2022-04-01 | 沈阳航空航天大学 | Repair of composite material wind power blade damage and health monitoring method of repaired structure |
| CN113183494A (en) * | 2021-04-30 | 2021-07-30 | 上海扩博智能技术有限公司 | Method for maintaining fan blade based on robot |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101186111A (en) * | 2007-11-23 | 2008-05-28 | 上海麦登复合材料有限公司 | Repairing method of fan blade |
| CN101903162A (en) * | 2007-12-21 | 2010-12-01 | 维斯塔斯风力***集团公司 | A method of repairing a fibre composite solid member |
| CN103847108B (en) * | 2013-09-26 | 2016-09-14 | 黑龙江天华风电设备制造有限公司 | The method for maintaining of roots of glass fiber reinforced plastic blades dry fibers |
| CN107618177A (en) * | 2017-09-27 | 2018-01-23 | 北京金风科创风电设备有限公司 | Blade internal reinforcement method and wind generating set blade |
| CN107672201A (en) * | 2017-11-10 | 2018-02-09 | 国电联合动力技术(连云港)有限公司 | A kind of restorative procedure for wind power generating set damaged blade girder |
-
2019
- 2019-12-20 CN CN201911326171.2A patent/CN111042997B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN111042997A (en) | 2020-04-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111042997B (en) | Method for repairing major structural damage reinforcement of main beam of wind turbine blade | |
| US7927077B2 (en) | Wind blade spar cap laminate repair | |
| CN103042700B (en) | Integrated forming method and device for segmented blade | |
| CN202660148U (en) | Pipeline repaired and reinforced by fiber composite cloth | |
| CN102814996B (en) | Preparing method of hybrid composite wing spar of large-scale wind power blade | |
| CN101576195B (en) | Construction method for repairing pipelines with defects by use of prepreg | |
| CN102481733B (en) | A Method Of Strengthening A Wind Turbine Blade And The Strengthened Blade | |
| CN103847108B (en) | The method for maintaining of roots of glass fiber reinforced plastic blades dry fibers | |
| CN104741864B (en) | A kind of structural damage fast repairing method | |
| CN107538770A (en) | A kind of advanced composite material repairing material and repair method | |
| EP3298275A1 (en) | Aerodynamic shroud and method | |
| CN108622436A (en) | A kind of repair method after composite material blade damage | |
| CN105730715B (en) | A kind of repair method of composite wing flap local damage | |
| CN215213781U (en) | Wind driven generator blade main beam repaired in compensatory manner | |
| CN105673358B (en) | A kind of large size trailing edge segmentation pneumatic equipment bladess connection structure and manufacture craft | |
| CN109515667B (en) | Carbon fiber composite propeller for ship and preparation method thereof | |
| CN209718680U (en) | A kind of low wind speed wind electricity blade reinforces precast body and Wind turbines | |
| CN115583051B (en) | Apparatus, system and molding method for resin transfer molding | |
| CN114103160B (en) | Forming process method for preventing honeycomb chamfer instability of composite material interlayer part | |
| CN113787740A (en) | Method for repairing reinforcement of trailing edge of wind turbine blade | |
| SI24502A (en) | The manufacturing process of the models for windmill wings | |
| CN102626992A (en) | Method for preparing manhole plate and manhole cover plate of megawatt-stage wind power generation blade root | |
| CN112976617A (en) | Drilling maintenance method for wind power blade pultrusion main beam | |
| CN109514885A (en) | A kind of etch-proof wind electricity blade of leading edge and its forming method | |
| CN109955506A (en) | A kind of recoverable airship solar heat protection outsole integral forming technique method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Application publication date: 20200421 Assignee: LIANYUNGANG ZHONGFU LIANZHONG COMPOSITES GROUP Co.,Ltd. Assignor: Nanjing University of Aeronautics and Astronautics|WUXI WIND POWER INSTITUTE Co.,Ltd. Contract record no.: X2022320000093 Denomination of invention: A reinforcing repair method for major structural damage of wind turbine blade girder Granted publication date: 20210126 License type: Common License Record date: 20220609 |