A method for manufacturing a wind turbine blade without cutting off flash

Abstract

The application relates to a wind power generator wind wheel blade mold joint seam flash cutting-free preparation method and belongs to the field of wind power generator equipment. The steps comprise laying and pouring of a windward surface skin, a windward surface skin, a mold joint flash cloth layer, an outer skin demolding cloth to form a windward surface blade and a leeward surface blade; glue coating and mold joint of the windward surface blade and the leeward surface blade, and formation of an integrated wind wheel blade after mold joint; and tearing off of the mold joint flash of the wind wheel blade and polishing treatment. The wind power generator wind wheel blade mold joint flash demolding-free preparation method provided by the application is reasonable in process design, especially in that the blade is free from cutting after demolding, the blade quality can be improved, defects caused in the blade flash cutting process of the prior art can be solved, cost waste can be reduced, and production efficiency can be improved.

Description

TECHNICAL FIELD

[0001] The application relates to a wind wheel blade mold joint seam flash free cutting preparation method for wind power generation, and belongs to the field of wind power generator equipment. BACKGROUND

[0002] Currently, when a glass fiber sleeve material is designed in an early stage, a skin flash cloth layer is designed together with a skin cloth layer, when a blade skin is laid, a first layer of outer skin is turned over a 100mm glass fiber cloth layer of a mold joint seam, is completed together with the skin by vacuum pouring, and is bonded by applying bonding glue in front edge and rear edge areas, so that the windward surface skin and the leeward surface skin are bonded together, after the bonding glue is solidified, the blade is demolded, and after demolding, the flash area glass fiber cloth layer and the excess bonding glue squeezed out from the front edge and the rear edge are cut off. In the blade flash cutting process, the blade product area cloth layer is cut, and too much bonding glue in the mold joint seam area is cut off, thereby defects are generated. SUMMARY

[0003] The application provides a wind wheel blade mold joint seam flash free cutting preparation method for wind power generation.

[0004] The application adopts the following scheme;

[0005] A wind wheel blade mold joint seam flash free cutting preparation method for wind power generation, wherein the wind wheel blade is composed of a main beam, a rear edge beam, a windward surface skin, a leeward surface skin and a web plate.

[0006] The preparation steps are as follows:

[0007] The mold for preparing the windward surface of the wind wheel blade and the leeward surface of the wind wheel blade comprises a windward surface front edge, a windward surface rear edge, a leeward surface front edge and a leeward surface rear edge for preparing the windward surface of the wind wheel blade and the leeward surface of the wind wheel blade.

[0008] S1, a front edge mold joint flash cloth layer is laid at the mold joint seam of the windward surface skin front edge, and a rear edge mold joint flash cloth layer is laid at the mold joint seam of the windward surface skin rear edge;

[0009] S2, a front edge outer skin demolding cloth is laid again on the front edge mold joint flash cloth layer of the windward surface skin front edge in step S1, and a rear edge outer skin demolding cloth is laid again on the rear edge mold joint flash cloth layer of the windward surface skin rear edge;

[0010] S3, a front edge mold joint flash cloth layer is laid at the mold joint seam of the leeward surface skin front edge, and a rear edge mold joint flash cloth layer is laid again at the mold joint seam of the leeward surface skin rear edge;

[0011] S4, a front edge outer skin demolding cloth is laid again on the mold joint flash cloth layer of the leeward surface skin front edge in step S3, and a rear edge outer skin demolding cloth is laid again on the mold joint flash cloth layer of the leeward surface skin rear edge;

[0012] S5, the main beam, the windward surface skin, the leeward surface skin, the mold closing flash cloth layer, and the outer skin release cloth form the windward surface of the wind wheel blade and the leeward surface of the wind wheel blade through pouring forming; at this time, the windward surface of the wind wheel blade and the leeward surface of the wind wheel blade are in an un-matching state;

[0013] S6, based on pouring forming in step S5, glass steel blocking tape is adhered at the front edge mold closing joint of the leeward surface skin of the wind wheel blade, glass steel blocking tape is adhered at the rear edge mold closing joint of the leeward surface skin, and glue is applied at the front edge angle area of the windward surface skin, the rear edge angle area of the leeward surface skin, and the web area respectively;

[0014] S7, the windward surface of the wind wheel blade is turned over and covers the leeward surface of the wind wheel blade, and the whole wind wheel blade is formed through mold closing;

[0015] S8, after the wind wheel blade is prepared and formed, the outer skin release cloth at the mold closing joint of the windward surface skin is torn off, the front edge and rear edge mold closing flash connected with the glass steel blocking tape are also torn off, and the adhesive glue at the mold closing joint of the windward surface skin is polished;

[0016] S9, the outer skin release cloth at the mold closing joint of the leeward surface skin is torn off, the front edge and rear edge mold closing flash connected with the glass steel blocking tape are also torn off, and the adhesive glue at the mold closing joint of the leeward surface skin is polished.

[0017] The wind wheel blade mold closing joint flash cutting removal preparation method provided by the application is characterized in that the windward surface skin and the leeward surface skin of the wind wheel blade are integrally formed with the mold closing flash through the mold closing vacuum pouring process.

[0018] In the S1 step and the S4 step of the wind wheel blade mold closing joint flash cutting removal preparation method provided by the application, the front edge mold closing flash cloth layer and the rear edge mold closing flash cloth layer laid at the mold closing joint of the windward surface skin and the leeward surface skin,

[0019] The laying requirement is that the mold closing joint of the mold of the windward surface of the wind wheel blade and the leeward surface of the wind wheel blade is 50mm wide to the mold closing joint flash in the mold cavity, and the remaining width is laid on the mold flange table area outside the mold closing joint, which is used for closing and bonding the mold vacuum.

[0020] In the S6 step of the wind wheel blade mold closing joint flash cutting removal preparation method provided by the application, the glass steel blocking tape is adhered at the leeward mold closing joint of the wind wheel blade, and the glass steel blocking tape is relatively bent into an angle edge structure during the windward surface pressing process.

[0021] The length of the vertical edge of the upper and lower outer skin release cloth in the wind wheel blade mold closing joint flash cutting removal preparation method provided by the application is greater than 50mm.

[0022] The present invention describes a method for preparing the die seam of a wind turbine blade without removing the burr. The fiberglass baffle strip has a transversely open "U"-shaped structure. The closed end of the fiberglass baffle strip faces the die seam between the leeward and windward sides of the wind turbine blade.

[0023] The wind turbine blade mold seam preparation method of the present invention, which eliminates the need for trimming, has a certain gap between the closed end of the fiberglass baffle strip and the mold seam on the leeward side of the wind turbine blade, and between the mold seam on the trailing edge of the leeward side of the wind turbine blade.

[0024] The method for preparing the flash of the mold seam of wind turbine blades according to the present invention includes the following steps for demolding the upper and lower mold seams in step S8:

[0025] 1) Pry open the bonding surfaces between the upper and lower outer skin release cloth and the outer skin surface of the wind turbine blades;

[0026] 2) After prying, starting from the pry point, tear along the outer skin demolding fabric chords to the overall width;

[0027] 3) After the outer skin release cloth is torn off, separate the entire outer skin release cloth from the leeward side and the windward side of the wind turbine blades.

[0028] The wind turbine blade mold seam preparation method of the present invention, which avoids the removal of the flash, first removes the outer skin release cloth of the wind turbine blade front edge and the outer skin release cloth of the leeward front edge, and then removes the outer skin release cloth of the rear edge of the wind turbine blade front edge and the fiberglass sealing strip; the outer skin release cloth of the leeward front edge and the fiberglass sealing strip.

[0029] In the wind turbine blade mold seam preparation method of the present invention, the windward side of the wind turbine blade is flipped over and covered on the leeward side of the wind turbine blade in step S7. The adhesive at the mold seam is then squeezed out of the mold seam area to fill the gap between the fiberglass baffle strip and the mold seam area. Beneficial effects

[0030] The wind turbine blade manufacturing method provided by this invention, which eliminates flash after demolding, has a reasonable process design. In particular, the blades do not need to be cut after demolding, which can improve the quality of the blades. It can solve the defects caused by the flash removal process in the prior art, reduce cost waste, and improve production efficiency.

[0031] The present invention provides a method for preparing wind turbine blades without removing the flash from the mold seam. By laying the flash, mold cloth, and skin cloth layers sequentially in the mold of the wind turbine blade, the flash removal process is simplified and the wind turbine blade can be made to have a complete surface. The flash on the skin can be simply polished, which improves the quality of the blade.

[0032] The present invention provides a method for preparing the flash of the mold seam of wind turbine blades without cutting off. A fiberglass strip is used between the skin release cloth. The fiberglass strip can prevent the adhesive at the mold seam from being fixed after the mold is closed, which is beneficial for grinding the mold seam after the skin release cloth is removed. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the overall structure layout of the wind turbine blade according to the flash-free preparation method of the present invention;

[0034] Figure 2 This is the present invention. Figure 1 Enlarged structural diagram at point A;

[0035] Figure 3 This is the present invention. Figure 1 Enlarged structural diagram at point B;

[0036] Figure 4 This is a schematic diagram of the fabric layer laying on the inner surface of the mold of the present invention. Implementation

[0037] To make the objectives and technical solutions of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0038] Wind turbine blades typically consist of a main beam 2, a trailing edge beam 14, a windward skin 1, a leeward skin 3, a leading edge web 4, and a trailing edge web 5. The leading edge web 4 and trailing edge web 5 are joined together through a series of processes including injection molding and adhesive bonding. The main beam 2, trailing edge beam 14, and the die-cutting edge are integrally formed with the shell using a vacuum injection molding process. The leading edge web 4 and trailing edge web 5 are bonded to the inner surface of the leeward side of the wind turbine blade. The leading edge web 4 and trailing edge web 5 are arranged in parallel, and a small web 6 is provided between the trailing edge beams 14.

[0039] A method for fabricating wind turbine blades without removing flash from the mold seam. The wind turbine blade is composed of a main beam, a trailing edge beam, a windward side skin, a leeward side skin, and a web plate. The fabrication steps are as follows:

[0040] The mold for preparing the windward and leeward sides of the wind turbine blades includes a front edge of the windward side, a rear edge of the windward side, a front edge of the leeward side, and a rear edge of the leeward side for preparing the windward and leeward sides of the wind turbine blades.

[0041] S1. Lay a front edge mold-closing burr fabric layer at the mold-closing seam of the front edge of the windward skin, and lay a rear edge mold-closing burr fabric layer at the mold-closing seam of the rear edge of the windward skin.

[0042] S2. In step S1, the outer skin release cloth is laid again on the front edge mold-closing edge cloth layer of the front edge of the windward skin; the outer skin release cloth is laid again on the rear edge mold-closing edge cloth layer of the rear edge of the windward skin.

[0043] S3. Lay the front edge mold-joining edge fabric layer at the mold-joining seam of the front edge of the leeward skin, and lay the rear edge mold-joining edge fabric layer again at the mold-joining seam of the rear edge of the leeward skin.

[0044] S4. In step S3, the outer skin release cloth 13 of the front edge is laid again on the mold-closing burr cloth layer of the leeward skin; the outer skin release cloth 13 of the rear edge is laid again on the mold-closing burr cloth layer of the rear edge of the leeward skin.

[0045] S5, the main beam, windward skin, leeward skin, mold-fitting flash fabric layer, and outer skin release fabric 13 are formed by injection molding to create the windward and leeward sides of the wind turbine blades; at this time, the windward and leeward sides of the wind turbine blades are not assembled; the windward and leeward skins of the wind turbine blades and the mold-fitting flash are integrally formed with the skin through a vacuum injection molding process;

[0046] S6. Based on the injection molding in step S5, the leading edge fiberglass baffle strip 11 is bonded at the mold seam of the leading edge of the leeward skin 3 of the wind turbine blade, and the trailing edge fiberglass baffle strip 12 is bonded at the mold seam of the trailing edge of the leeward skin 3. Adhesive is applied to the bonding angle area 15 of the leading edge of the windward skin 1, the bonding area of ​​the trailing edge of the leeward skin 4, the leading edge web 4, and the trailing edge web 5.

[0047] S7. Flip the windward side of the wind turbine blade over and cover the leeward side of the wind turbine blade to form an integral wind turbine blade. The fiberglass baffle strip initially has a semi-circular structure. During the mold closing process, the fiberglass baffle strip is compressed by the mold pressure to form a "U" shape. The closed end of the fiberglass baffle strip faces the mold closing seam between the leeward side and the windward side of the wind turbine blade.

[0048] S8. After the wind turbine blades are formed, remove the outer skin release cloth at the mold joint of the windward skin 1, and remove the fiberglass sealing strips along with the front and rear edge mold joint burrs; grind the adhesive at the mold joint of the windward skin.

[0049] The demolding steps for the upper and lower molds and the flash are as follows:

[0050] 1) Pry open the bonding surfaces between the upper and lower outer skin release cloth and the outer skin surface of the wind turbine blades;

[0051] 2) After prying, starting from the pry point, tear along the outer skin demolding fabric chords to the overall width;

[0052] 3) First, remove the outer skin release cloth 13 from the windward front edge and the outer skin release cloth 13 from the leeward front edge of the wind turbine blades. Then, remove the outer skin release cloth 13 from the rear edge of the windward side of the wind turbine blades, the fiberglass baffle strip 11 from the front edge, and the fiberglass baffle strip 12 from the rear edge; remove the outer skin release cloth 13 from the front edge of the leeward side, the fiberglass baffle strip 11 from the front edge, and the fiberglass baffle strip 12 from the rear edge.

[0053] After the outer skin release cloth 13 is torn open, the outer skin release cloth 13 is completely separated from the leeward side and the windward side of the wind turbine blades.

[0054] S9. Remove the outer skin release cloth at the leeward side skin mold joint, and remove the fiberglass retaining strips connecting the front and rear edge mold joints together; grind the adhesive at the leeward side skin mold joint.

[0055] During the fiberglass sleeve design phase, the front edge mold closing flash 9 and the rear edge mold closing flash 10 of the mold are separated from the windward skin 1 and the leeward skin 3. A separate fiberglass cloth layer width W is allocated for the mold closing flash. First, the fiberglass cloth layers for the front edge mold closing flash 9 and the rear edge mold closing flash 10 are laid. During laying, the width inside the mold cavity is 50mm, and the width of the flash layer outside the mold closing seam is W-50mm. After the front edge mold closing flash 9 and the rear edge mold closing flash 10 are laid, the outer skin release cloth 13 is laid. The width of the outer skin release cloth 13 inside the cavity is 50mm greater than the width of the flash layer inside the cavity. After the outer skin release cloth 13 is laid, the windward skin 1 and the leeward skin 2 structures are laid. After laying, injection curing is performed, and the injection auxiliary material is removed after curing.

[0056] At the front edge mold closing flash 9 and the rear edge mold closing flash 10, a mold closing vacuum is applied to the mold flange platform for mold closing bonding. Before the mold closing adhesive is released, a front edge fiberglass baffle strip 11 is bonded to the mold closing seam truss of the front edge flash on the leeward side skin 3, and a rear edge fiberglass baffle strip 12 is bonded to the mold closing seam truss of the rear edge flash on the leeward side skin 2. The front edge fiberglass baffle strip 11 and the rear edge fiberglass baffle strip 12 are positioned Dmm away from the inner edge of the mold and are bonded to the front of the windward side skin 1 respectively. Apply adhesive 8 to the bonding area of ​​the windward side skin 3, apply adhesive 7 to the bonding area of ​​the rear edge of the windward side skin 3, and apply adhesive to the web area. After applying the adhesive, flip the windward side mold. During the process of flipping and pressing the windward side mold, the front edge fiberglass baffle strip 11 and the rear edge fiberglass baffle strip 12 will be pressed down, filling the Dmm gap between the front edge fiberglass baffle strip 11, the rear edge fiberglass baffle strip 12 and the inner edge, so that the two adhesives 7 and 8 at the front and rear edges cannot be squeezed into the mold joint area. After the mold is closed and bonded, the adhesive is cured by heating.

[0057] First, lay the mold-closing flash fabric layer on the windward and leeward sides, then lay the release fabric. Secure the release fabric and mold-closing flash layers with adhesive spray, avoiding dotted spraying to prevent concentrated adhesive from reducing the direct connection strength between the mold-closing flash and the skin after injection. The width of the release fabric within the mold cavity should be greater than the width of the fabric layer within the mold-closing flash cavity. After the release fabric is laid, lay the windward and leeward skin structure layers at the mold-closing seam. After the skin is laid, perform vacuum injection curing to pre-form the mold-closing flash and skin together. The web plate needs to be bonded to the shell with adhesive.

[0058] Mold bonding: During the first bonding of the blade, after applying adhesive to the windward skin main beam area, place the web plate and wait for it to cure. Then, apply adhesive to the bonding flange on the leeward side of the web plate and bond the web plate to the leeward main beam and trailing edge beam area. Apply adhesive to the bonding angle area 15 on the windward front edge and the bonding area on the leeward rear edge. Turn the mold over and lock it. The process of forming a whole by heat curing the adhesive is the blade mold bonding process.

[0059] Flash removal: After demolding, use a utility knife to pry open the starting point of the release cloth 13 under the outer skin at the leaf root. After prying open the starting point, tear off the chordal width of the outer skin release cloth 13. After tearing off the chordal width, remove the entire outer skin release cloth 13. During the process of removing the outer skin release cloth 13, the front edge mold closing flash 9, the rear edge mold closing flash 10, the front edge fiberglass retaining strip 11, and the rear edge fiberglass retaining strip 12 can be removed.

[0060] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A wind turbine blade mold joint flash cutting method, the wind turbine blade is composed of a main beam, a trailing edge beam, a windward surface skin, a leeward surface skin, and a web plate. characterized in that The preparation steps are as follows: The mold for preparing the windward surface of the wind turbine blade and the leeward surface of the wind turbine blade includes the windward surface leading edge, the windward surface trailing edge, the leeward surface leading edge, and the leeward surface trailing edge. S1. A leading edge mold joint flash cloth layer is laid at the mold joint of the windward surface skin leading edge, and a trailing edge mold joint flash cloth layer is laid at the mold joint of the windward surface skin trailing edge. S2. A leading edge outer skin release cloth is laid again on the leading edge mold joint flash cloth layer of the windward surface skin leading edge in step S1, and a trailing edge outer skin release cloth is laid again on the trailing edge mold joint flash cloth layer of the windward surface skin trailing edge. S3. A leading edge mold joint flash cloth layer is laid at the mold joint of the leeward surface skin leading edge, and a trailing edge mold joint flash cloth layer is laid again at the mold joint of the leeward surface skin trailing edge. S4. A leading edge outer skin release cloth is laid again on the mold joint flash cloth layer of the leeward surface skin leading edge in step S3, and a trailing edge outer skin release cloth is laid again on the mold joint flash cloth layer of the leeward surface skin trailing edge. S5. The main beam, the windward surface skin, the leeward surface skin, the mold joint flash cloth layer, and the outer skin release cloth are formed into the windward surface of the wind turbine blade and the leeward surface of the wind turbine blade through pouring. At this time, the windward surface of the wind turbine blade and the leeward surface of the wind turbine blade are in an unbundled state. S6. After pouring in step S5, glass steel blocking strips are adhered at the mold joint of the leeward surface skin leading edge and the mold joint of the leeward surface skin trailing edge of the wind turbine blade, and glue is applied to the areas of the windward surface skin leading edge angle area, the leeward surface skin trailing edge bonding area, and the web plate area. S7. The windward surface of the wind turbine blade is turned over and covers the leeward surface of the wind turbine blade, and the whole wind turbine blade is formed by mold joint. S8. After the wind turbine blade is prepared and formed, the outer skin release cloth at the mold joint of the windward surface skin is torn off, and the leading edge and trailing edge mold joint flash connected with the glass steel blocking strip are also removed. The bonding glue at the mold joint of the windward surface skin is polished. S9. The outer skin release cloth at the mold joint of the leeward surface skin is torn off, and the leading edge and trailing edge mold joint flash connected with the glass steel blocking strip are also removed. The bonding glue at the mold joint of the leeward surface skin is polished.

2. The method for manufacturing wind turbine blade of wind power generation without cutting off flash of combined die seam according to claim 1, characterized in that: The windward surface skin, the leeward surface skin, and the mold joint flash of the wind turbine blade are integrally formed through the vacuum pouring process with the skin.

3. The method of claim 1, wherein the method further comprises: after the step of forming the blade, applying a coating to the blade. In steps S1 and S4, the leading edge mold joint flash cloth layer and the trailing edge mold joint flash cloth layer laid at the mold joint of the windward surface skin and the leeward surface skin, The laying requirement is that the mold joint to the mold joint flash width of 50 mm in the mold cavity of the mold for preparing the windward surface of the wind turbine blade and the leeward surface of the wind turbine blade, and the remaining width is laid on the mold flange area outside the mold joint for mold joint bonding to block the mold vacuum.

4. The method of claim 1, wherein the method further comprises: providing a plurality of wind turbine blades; and joining the plurality of wind turbine blades together to form a wind turbine rotor. In step S6, the glass steel blocking strip adhered at the mold joint of the leeward surface of the wind turbine blade is relatively bent into an angle edge structure during the downward pressing of the windward surface.

5. The method of claim 1, wherein the method further comprises: after the step of forming the blade, applying a coating to the blade. The length of the vertical edge of the upper and lower outer skin release cloth is greater than 50 mm.

6. The method of claim 1, wherein the method further comprises: after the step of forming the blade, applying a coating to the blade. The glass steel glue blocking strip section transverse opening "U" structure; the closed end of the glass steel glue blocking strip faces the mold joint between the leeward surface of the wind wheel blade and the windward surface of the wind wheel blade.

7. The method of claim 6, wherein the method further comprises: after the step of forming the flash, removing the flash from the blade by a cutting process. The closed end of the glass steel glue blocking strip is provided with a certain gap between the front mold joint of the leeward surface of the wind wheel blade and the trailing edge of the leeward surface of the wind wheel blade.

8. The method of claim 1, wherein the method further comprises: after the step of forming the blade, applying a coating to the blade. The upper and lower mold joint flash demolding steps in S8 are as follows: 1) pry the bonding surface of the upper and lower outer skin demolding cloth and the outer skin surface of the wind wheel blade; 2) after prying, tear the outer skin demolding cloth along the chordwise overall width from the prying point as the starting point; 3) after tearing the outer skin demolding cloth, separate the overall outer skin demolding cloth from the leeward surface of the wind wheel blade and the windward surface of the wind wheel blade.

9. The wind wheel blade mold joint flash removal method of claim 8, wherein: The outer skin demolding cloth on the leading edge of the windward surface of the wind wheel blade and the outer skin demolding cloth on the leading edge of the leeward surface of the wind wheel blade are first torn off, and then the outer skin demolding cloth on the trailing edge of the windward surface of the wind wheel blade and the glass steel glue blocking strip are torn off.

10. The method for preparing wind turbine blades without removing the flash from the mold seam according to claim 1, 6, or 7, characterized in that: After the windward surface of the wind wheel blade is turned over and covers the leeward surface of the wind wheel blade in S7, the adhesive on the mold joint is extruded out of the mold joint area, filling the gap between the glass steel glue blocking strip and the mold joint area.

Images