CN103419380A - Prefabrication process of megawatt-scale large-scale wind power blade root - Google Patents

Abstract

The invention provides a process for prefabricating and forming a blade root of a megawatt large-scale wind power blade, which comprises the following steps: firstly, laying the glass fiber cloth of the blade root prefabricated part on a blade root prefabricated part mould, then carrying out vacuum infusion and heating curing forming, and finally transferring the cured and formed blade root prefabricated part into a main mould to be integrally formed. The blade root is formed by mainly adopting a vacuum infusion thermosetting process in the blade forming process, the quality defects of incomplete infusion of the blade root or whitening of the blade root and the like can be greatly reduced by the process, the reliability of the blade is improved, resin curing can be accelerated by thermosetting, and the production efficiency of the large-scale wind power blade is improved.

Description

Prefabrication process of megawatt-scale large-scale wind power blade root

technical field

The invention relates to the technical field of manufacturing blades of wind power generation devices, in particular to a prefabrication process of blade roots of megawatt-level large-scale wind power blades.

Background technique

With the massive depletion of non-renewable energy sources, wind power generation has attracted more and more attention from countries all over the world. Wind power generation uses wind power to drive the blades of windmills to rotate, and then increases the speed of rotation through a speed increaser to make the power generation device generate electricity. Wind power blades are the core components of the unit, and blade technology is one of the core technologies of the wind power generation system. The main bearing force lies in the blade roots, which have an important impact on the quality of the blades, and their performance directly affects the service life of the blades.

With the development of the wind power industry, wind power blades are becoming larger and larger, and the blade roots of wind power blades also become thicker as the blades become larger. The thickening of the blade roots makes it difficult to perfuse the blade roots or the blade roots turn white, which directly leads to a decrease in the quality of the blade roots. , affecting the service life of the blade.

Contents of the invention

Aiming at the deficiencies in the above-mentioned prior art, the present invention aims to provide a prefabricated molding process for megawatt-scale large-scale wind power blade roots, which greatly reduces the cycle of resin infusion in blade molding, and reduces the risk of quality defects in blade roots during blade molding. risk, improving the quality of large wind turbine blades.

In order to achieve the above object, the technical solution of the present invention is a process for prefabricating the blade root of a megawatt-scale large-scale wind power blade. Then vacuum infusion, heating and curing molding, and finally transfer the cured blade root preform into the main mold for integral molding.

Wherein, the blade root prefabricated part mold is consistent with the profile and specification of the large-scale wind power blade.

Specifically, the step of vacuum infusion is to sequentially lay a porous isolation film, a release cloth, a diversion net, an omega tube, and a sealing strip on the glass fiber cloth, lay a pouring pipe on the edge of the diversion net, and finally Lay the vacuum bag film on the upper layer, and finally carry out vacuuming and resin infusion.

Further, the sealant strip is butyl sealant; and there are two strips, wherein the first strip is 200mm away from the parting line of the preform mold, and the second strip is 0-10mm away from the first strip.

Further, the pouring pipe is a vacuum spiral pipe and a steel wire spiral pipe.

Further, the resin is obtained by mixing epoxy resin and epoxy resin curing agent in a ratio of 100:26-30.

Further, the glass fiber cloth is a triaxial glass fiber cloth, and each layer is staggered by 10mm in the axial direction when it is laid.

Finally, after curing, remove the perforated isolation film, diversion net, omega tube, sealing strip, pouring tube, and vacuum bag film.

Beneficial effects of the present invention: in the process of blade forming, the blade root mainly adopts the process of vacuum infusion and thermal curing to form the blade root, which can greatly reduce the quality defects such as impermeable perfusion of the blade root or whitening of the blade root, and improve the The reliability of the blade, while thermal curing can accelerate the curing of the resin, improving the production efficiency of large wind power blades.

Detailed ways

The present invention will be further described in detail below in conjunction with specific examples.

A blade root prefabrication molding process for megawatt-scale large-scale wind power blades, the process steps are: first laying the glass fiber cloth of the blade root prefabrication on the blade root prefabrication mold, then vacuum infusion, heating and curing molding, and finally curing The shaped blade root preform is transferred into the main mold for integral molding. In the blade forming process of the present invention, the vacuum infusion heat curing process is mainly used to form the blade root. This process can greatly reduce quality defects such as impermeable blade root perfusion or whitish blade root, and improve the reliability of the blade. Curing can speed up resin curing and improve the production efficiency of large wind power blades.

Wherein, the prefabricated part mold has the same shape and specification as the large wind power blade. The prefabricated part mold is processed according to the profile of the large wind power blade, and the prefabricated part mold can be processed into the same specification as the large wind power blade according to the specific production process.

Specifically, the step of vacuum infusion is to sequentially lay a porous isolation film, a release cloth, a diversion net, an omega tube, and a sealing strip on the glass fiber cloth, lay a pouring pipe on the edge of the diversion net, and finally Lay the vacuum bag film on the upper layer, and finally carry out vacuuming and resin infusion. Afterwards, the heat curing is to lay a heating blanket on the surface for post-heat curing, and the curing temperature is 70 degrees. After curing, remove the previously laid vacuum auxiliary materials such as heating blankets, vacuum bag films, diversion nets, pouring pipes, perforated isolation films, release cloths, omega tubes, and sealing strips. Finally, the cured and formed The blade root prefabricated part is transferred into the main mold for integral molding.

Further, the sealant strip is butyl sealant; and there are two strips, wherein the first strip is 200mm away from the parting line of the preform mold, and the second strip is 5mm away from the first strip. The sealing strip is mainly to slow down the forward (axial) flow rate of the resin, thereby increasing the downward (chordwise) permeation rate of the resin, and solving the problem of impermeable perfusion of the blade root or whitening of the blade root.

The vacuum bag film is double-layered, and a layer of V160 diversion net is laid between the first layer and the second layer, and a vacuum system is established by pumping air; the vacuum system reaches 50mbr, and the pressure is kept below 50mbr for 10 minutes; epoxy resin and epoxy resin After the resin curing agent is mixed according to a certain ratio, the injection port is opened for pouring. After the infusion is completed, turn on the heating blanket of the mold heating system to raise the temperature to 70°C for curing. Increase the temperature by 10°C per hour until it reaches 70°C, and keep it warm for no less than 4 hours (subject to the fact that the shell is cured and not sticky and easy to remove auxiliary materials) or use a Shore hardness tester to measure its hardness at the leaf root. When the hardness is ≥ 60, it can be Perform demoulding.

Finally, after curing, remove the vacuum auxiliary materials such as the porous isolation film, diversion net, omega tube, sealing strip, pouring tube, vacuum bag film, etc., and wait for use after completion.

In addition, the pouring pipe is a vacuum spiral pipe and a steel wire spiral pipe, and the vacuum spiral pipe and the steel wire spiral pipe are used as the pouring pipe to ensure that the pouring speed matches the diversion net and the resin penetrates evenly.

In order to achieve the best mechanical effect, the resin is obtained by mixing epoxy resin and epoxy resin curing agent in a ratio of 100:28.

In order to ensure that the force of the glass fiber cloth is transmitted evenly, the glass fiber cloth is a triaxial glass fiber cloth, and each layer is staggered by 10mm when laying.

The technical solutions provided by the embodiments of the present invention have been introduced in detail above, and the principles and implementation modes of the embodiments of the present invention have been explained by using specific examples in this paper. The descriptions of the above embodiments are only applicable to help understand the embodiments of the present invention At the same time, for those of ordinary skill in the art, according to the embodiment of the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be construed as limiting the present invention.

Claims (8)

1. the pre-formed technique of MW class large-scale wind electricity blade root, it is characterized in that, described processing step is: first blade root prefabricated component glass-fiber-fabric is laid on the blade root prefabricated-member mould, and then priming by vacuum, the moulding that is heating and curing, finally by the blade root prefabricated component after curing molding, call in main mould one-body molded.

2. require the pre-formed technique of 1 described MW class large-scale wind electricity blade root according to patent, it is characterized in that: described blade root prefabricated-member mould is consistent with the large-scale wind electricity blade profile, and specification is consistent.

3. require the pre-formed technique of 1 described MW class large-scale wind electricity blade root according to patent, it is characterized in that: the step of described priming by vacuum is, lay successively porous release film, release cloth, flow-guiding screen, omega pipe, sealing joint strip on glass-fiber-fabric, lay and build pipe at the edge of flow-guiding screen, the vacuum bag film is laid by the superiors, is finally vacuumized, the resin perfusion.

4. require the pre-formed technique of 3 described MW class large-scale wind electricity blade root according to patent, it is characterized in that: described sealing joint strip is butyl sealant; And it is two, wherein article one is apart from prefabricated-member mould die parting line 200mm, and second is apart from article one 0～10mm.

5. require the pre-formed technique of 3 described MW class large-scale wind electricity blade root according to patent, it is characterized in that: the described pipe of building is for vacuum spiral coil and steel wire spiral pipe.

6. require the pre-formed technique of 3 described MW class large-scale wind electricity blade root according to patent, it is characterized in that: described resin mixes gained in 100:26～30 in proportion by epoxy resin and epoxy curing agent.

7. require the pre-formed technique of 1 or 3 described MW class large-scale wind electricity blade root according to patent, it is characterized in that: described glass-fiber-fabric is three axial glass-fiber-fabrics, and every layer of axial wrong 10mm during its laying.

8. require the pre-formed technique of 3 described MW class large-scale wind electricity blade root according to patent, it is characterized in that: after solidifying by porous release film, flow-guiding screen, omega pipe, sealing joint strip, build pipe, the vacuum bag film is all removed.