Method and system for eliminating bubbles between pouring layers of pultrusion beam

Abstract

The invention relates to the field of wind power equipment, and discloses a method and system for eliminating bubbles between pouring layers of a pultrusion beam of a wind power blade. Comprising a main mold, a continuous felt, an outer skin, a pultrusion beam, an inner skin, first demolding cloth, a porous film, a first flow guide net, a VAP film, second demolding cloth located between the continuous felt and the VAP film, a second flow guide net and pultrusion beam side runners located on the rear edge and the front edge of the pultrusion beam. The continuous felt, the outer skin, the pultrusion beam, the inner skin, the first demolding cloth, the porous film and the first flow guide net are sequentially arranged in the main mold from bottom to top; the VAP film comprises an axial VAP film and a chordwise VAP film, and the axial VAP film is laid below the continuous felt and is flush with the front edge side of the continuous felt; one end of the chordwise VAP film is lapped with the axial VAP film, and the other end of the chordwise VAP film is lapped with the second flow guide net; and the second flow guide net is positioned on the flange platform of the main mold and completely covers the mold front edge extraction opening. By accurately controlling the straightness of the pultrusion sheet and optimizing the continuous felt layout and the pouring process, bubbles are effectively reduced.

Description

Technical Field

[0001] The invention relates to the field of wind power equipment, and in particular to a method and a system for eliminating bubbles between pouring layers of a pultruded beam. Background Art

[0002] The pultruded beam plays a very important role in the blade structure and is subjected to great force during blade operation. The pultruded beam is integrated with the shell structure through vacuum infusion and is an important part of the entire blade structure. The quality of the pultruded beam infusion is crucial to the strength and service life of the entire blade. In the pultruded beam infusion quality, interlayer bubbles are the most common and difficult to control; the traditional continuous felt arrangement under the pultruded beam cannot solve the problem of interlayer bubbles in the pultruded beam. Summary of the invention

[0003] In view of the above-mentioned technical deficiencies, the technical problem to be solved by the present invention is to provide a method and system for eliminating bubbles between the layers of a pultruded beam, aiming to eliminate the bubbles between the layers of the pultruded beam.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solution: The present invention provides a system for eliminating bubbles between pouring layers of pultruded beams, comprising: Main mold, continuous felt, outer skin, pultruded beam, inner skin, first demoulding cloth, perforated film, first guide net, VAP film, second demoulding cloth, second guide net and pultruded beam side runner; The continuous felt, outer skin, pultruded beam, inner skin, first demoulding cloth, porous film and first guide net are arranged in the main mold from bottom to top in sequence; The VAP membrane includes an axial VAP membrane and a chordal VAP membrane. The axial VAP membrane is laid under the continuous felt and aligned with the leading edge of the continuous felt. One end of the chordal VAP membrane overlaps the axial VAP membrane, and the other end overlaps the second guide net. The second release cloth is located between the continuous felt and the VAP film; The second guide net is located on the flange platform of the main mold and completely covers the exhaust port at the front edge of the mold; at the same time, the exhaust port is pasted with a chord-wise VAP film; The side runners of the pultruded beam are located at the trailing and leading edges of the pultruded beam.

[0005] Furthermore, the continuous felt is laid in a butt-jointed manner, and the continuous felt extends beyond the edge of the pultruded beam by at least 50 mm on all sides.

[0006] Further, the laying width of the VAP mold is 150 mm, the chord-wise VAP membrane width is 100 mm and is evenly laid at a set distance; At the same time, one end of the chord-wise VAP membrane overlaps the axial VAP membrane by at least 50 mm, and the other end overlaps the second guide net by at least 50 mm.

[0007] Furthermore, the pultruded beam is composed of multiple layers of pultruded beam sheets and pultruded beam interlayer cloths laid in an alternating manner.

[0008] Among them, the total width of the interlayer cloth of the pultruded beam is at least 60mm greater than the total width of the pultruded beam, and the two sides of the interlayer cloth of the pultruded beam exceed the edge of the pultruded beam by at least 30mm.

[0009] Furthermore, the first pultruded beam side flow channel at the rear edge of the pultruded beam is 50-100 mm away from the pultruded beam edge, and the first pultruded beam side flow channel at the leading edge of the pultruded beam is 80-150 mm away from the beam edge.

[0010] Furthermore, if the number of fabric layers below the pultruded beam is greater than n layers, only a continuous felt in contact with the pultruded beam is provided.

[0011] Furthermore, the method also includes replacing the second guide net with a glue-absorbing felt.

[0012] Furthermore, it also includes adding an axial sealing strip on the guide net to block the glue, so as to reduce the difference in glue flow rate between the upper and lower areas of the pultruded beam structure and reduce the risk of the pultruded beam being wrapped.

[0013] A method for eliminating bubbles between pouring layers of a pultruded beam, comprising: Check the straightness of the pultruded beam sheet. If the middle part between the pultruded beam sheets is greater than 5mm, replace it; When the mold is empty, mark the positioning area of ​​the pultruded beam and lay the continuous felt. The continuous felt is laid in a butt-jointed manner and the continuous felt is at least 50mm beyond the edge of the pultruded beam to absorb the bubbles between the pultruded sheet layers onto the continuous felt. If the number of layers under the pultruded beam is greater than n, the continuous felt is not laid. A 150mm wide axial VAP mold is laid under the continuous felt and flush with the leading edge of the continuous felt; at the same time, a 100mm wide chord-wise VAP membrane is laid every 5m in the chord-wise direction, one end of which overlaps the axial VAP membrane by 50mm, and the other end overlaps the second guide net or the adhesive felt to cover the air extraction port, which is used to guide out the bubbles on the continuous felt; After the continuous felt and VAP membrane are laid, the outer skin is laid, the pultruded beam is hoisted, the inner skin, the first release cloth, the porous membrane, the first guide net, the second release cloth and the second guide net are laid; at the same time, a pultruded beam edge flow channel is set at the rear edge and the leading edge of the pultruded beam for pouring glue.

[0014] The beneficial effects of the present invention are: 1. The present invention significantly reduces the gaps and cavities between sheets by precisely controlling the straightness of the pultruded sheets, laying a solid foundation for the pultruded beam infusion process. This measure effectively suppresses the generation of bubbles during the infusion process and improves the overall quality of the product; at the same time, the positioning strategy of the interlayer cloth of the solidified pultruded beam ensures the uniformity of the glue flow, further enhancing the infusion effect.

[0015] 2. The present invention innovatively adjusts the position of the continuous felt, moving it from the pultruded beam to the outside of the outer skin of the beam area. This layout makes full use of the three-dimensional mesh structure of the continuous felt and its high specific surface area to effectively absorb and eliminate bubbles generated during the infusion process. The SiO2 component in the continuous felt can change the surface tension of the bubbles and cause them to burst, thereby significantly reducing the bubble problem in the pultruded beam area and improving the structural integrity and performance stability of the product.

[0016] 3. By deeply analyzing the direction of bubbles and optimizing the infusion method accordingly, the present invention effectively reduces the phenomenon of dead packing and bubbles in the pultruded beam area during the infusion process, and improves the success rate and efficiency of the infusion; in addition, process improvement measures such as adjusting the flow channel layout on the beam side also further improve the stability and controllability of the production process. These comprehensive measures not only reduce production costs and defective product rates, but also enhance the market competitiveness of products, bringing significant economic benefits to enterprises. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic diagram of the structure of a system for eliminating bubbles between pouring layers of a wind turbine blade pultruded beam provided by an embodiment of the present invention.

[0019] Explanation of the reference numerals: 1. exhaust port at the front edge of the mold; 2. continuous felt; 3. VAP film; 4. second demoulding cloth; 5. outer skin; 6. inner skin; 7. second guide net; 8. pultruded beam interlayer cloth; 9. pultruded beam sheet; 10. pultruded beam side flow channel. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Example 1

[0022] Reference Figure 1 This embodiment provides a system for eliminating bubbles between pouring layers of a pultruded beam, comprising: Main mold, continuous felt, outer skin, pultruded beam, inner skin, first demoulding cloth, perforated film, first guide net, VAP film, second demoulding cloth, second guide net and pultruded beam side runner; The continuous felt, the outer skin, the pultruded beam, the inner skin, the first demoulding cloth, the porous film, and the first guide net are arranged in the main mold from bottom to top; The VAP membrane includes an axial VAP membrane and a chordal VAP membrane. The axial VAP membrane is laid under the continuous felt and aligned with the leading edge of the continuous felt. One end of the chordal VAP membrane overlaps the axial VAP membrane, and the other end overlaps the second guide net. The second release cloth is located between the continuous felt and the VAP film; The second guide net is located on the flange platform of the main mold and completely covers the exhaust port at the front edge of the mold; at the same time, the exhaust port is pasted with a chord-wise VAP film; The side runners of the pultruded beam are located at the trailing and leading edges of the pultruded beam.

[0023] It should be noted that the continuous felt is laid in a butt-jointed manner and the continuous felt extends at least 50mm beyond the edge of the pultruded beam.

[0024] The laying width of the VAP form is 150mm, the chord-wise VAP membrane width is 100mm and is laid evenly at the set distance; At the same time, one end of the chordal VAP membrane overlaps the axial VAP membrane by at least 50 mm, and the other end overlaps the second guide net by at least 50 mm.

[0025] The pultruded beam is composed of multiple layers of pultruded beam sheets and pultruded beam interlayer cloths laid in an alternating manner.

[0026] Among them, the total width of the interlayer cloth of the pultruded beam is at least 60mm greater than the total width of the pultruded beam, and the two sides of the interlayer cloth of the pultruded beam exceed the edge of the pultruded beam by at least 30mm.

[0027] The first pultruded beam side flow channel at the rear edge of the pultruded beam is 50-100mm away from the edge of the pultruded beam, and the first pultruded beam side flow channel at the leading edge of the pultruded beam is 80-150mm away from the beam edge.

[0028] It also includes that if the number of layers below the pultruded beam is greater than n layers, only the continuous felt in contact with the pultruded beam is provided.

[0029] The method also includes replacing the second guide net with a rubber absorption felt.

[0030] It also includes adding an axial sealing strip on the guide net to block the glue, which is used to reduce the difference in glue flow rate between the upper and lower areas of the pultruded beam structure and reduce the risk of the pultruded beam being wrapped.

[0031] Example 2

[0032] Based on Example 1, this embodiment also provides a method for eliminating bubbles between the pouring layers of the pultruded beam. Check the straightness of the pultruded beam sheet: The pultruded sheet is long. If the straightness and flatness of the pultruded beam sheet are poor, the gap between the sheets after assembly will be too large, and cavities will be formed during the infusion process. In addition, the pultruded beam area is farthest from the exhaust port at the front edge of the mold during infusion, and the gas is difficult to be extracted by the vacuum pump. Finally, it mixes with the resin to form bubbles. Spot check the straightness and flatness of sheets from different batches to verify the standard of the material. During the assembly process, the gaps at both ends of the sheets have been squeezed tight. If there is still a gap greater than 5mm in the middle after manual squeezing, it means that there is a problem with the straightness of the sheet and the sheet needs to be replaced.

[0033] Arrangement of interlayer cloth of pultruded beam: When designing the sleeve of interlayer cloth of pultruded beam, the total width of interlayer cloth of pultruded beam shall be more than 60mm larger than the total width of pultruded beam. When laying, the two sides shall exceed the edge of pultruded beam by 30mm. There may be deviation when laying interlayer cloth of pultruded beam, but it is forbidden to deviate to the inside of the edge of pultruded beam. There shall be glue guide on the left and right of interlayer cloth of pultruded beam, otherwise it is easy to be trapped and produce bubbles during pouring.

[0034] Arrangement of continuous felt: When the mold is empty, mark the positioning area of ​​the pultruded beam, and then lay the continuous felt in this area. The continuous felt is required to extend 50mm beyond the edge of the pultruded beam on all sides. The continuous felt is prohibited from overlapping, and it is laid in a butt-jointed manner to adsorb the bubbles between the pultruded sheet layers to the continuous felt; cancel the continuous felt in contact with the pultruded beam below the pultruded beam; but not all continuous felts in contact with the pultruded beam area below need to be cancelled. If the number of layers below the pultruded beam is greater than 5, it does not need to be cancelled, and the continuous felt does not need to be laid when the mold is empty.

[0035] Arrange VAP membrane: lay a continuous felt part on the empty mold under the pultrusion beam, and lay a 150mm wide VAP mold on the leading edge of the continuous felt. Lay a 100mm wide VAP membrane every 5m in the chord direction, overlap the VAP membrane under the leading edge continuous felt by 50mm in the cavity, and lay it on the guide net or glue suction felt at the exhaust point of the flange platform on the leading edge. The VAP membrane covers the exhaust port at the leading edge of the mold to prevent resin from entering the main mold pipeline, forming an effective protection. At the same time, the resin bubbles can be filtered and extracted. The VAP membrane can be set to reduce the risk of air leakage, and the exhaust pipeline needs to be replaced when the glue cross-section is larger than 1 / 3 of the pipeline cross-section to avoid exhaust failure.

[0036] Perfusion system layout: The first pultruded beam edge flow channel at the rear edge of the pultruded beam must not be located above the pultruded beam. The best distance between the flow channel and the edge of the pultruded beam is 50-100mm. Otherwise, the pultruded beam is prone to dead wrapping, dry yarn, etc. During the pre-curing process, the gas at the dry yarn is transferred to the joint of the pultruded beam sheet as the temperature rises, forming interlayer bubbles. The first pultruded beam edge flow channel at the leading edge of the pultruded beam must not be located above the pultruded beam, and should be 80-150mm away from the edge of the pultruded beam.

[0037] Pouring method: first pour the resin into the first pultruded beam side flow channel at the rear edge of the pultruded beam, first open its valve switch completely, and adjust the valve switch to half after the flow channel is completely filled with resin, until all the glue front reaches the first pultruded beam side flow channel at the front edge of the pultruded beam, and then open the valve switch of the first pultruded beam side flow channel at the rear edge of the pultruded beam to inject glue, and adjust the valve switch to half of the pultruded beam area throughout the whole process of pouring until the pouring of the pultruded beam area is completed.

[0038] The principle of the present invention is: adjust the positioning of the continuous felt, adjust the continuous felt under the pultruded beam to the outside of the outer skin, and use the three-dimensional network structure and large specific surface area of ​​the continuous felt to absorb bubbles in the infusion process. When the bubbles are adsorbed on the continuous felt, the continuous felt raw material SiO2 will change the surface tension of the bubbles, making them unstable and burst, thereby achieving the effect of eliminating the bubbles.

[0039] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A system for eliminating bubbles between layers of pultruded beams, characterized in that: include: Main mold, continuous felt, outer skin, pultruded beam, inner skin, first demoulding cloth, perforated film, first guide net, VAP film, second demoulding cloth, second guide net and pultruded beam side runner; The continuous felt, outer skin, pultruded beam, inner skin, first demoulding cloth, porous film and first guide net are arranged in the main mold from bottom to top in sequence; The VAP membrane includes an axial VAP membrane and a chordal VAP membrane, wherein the axial VAP membrane is laid under the continuous felt and is flush with the leading edge of the continuous felt; One end of the chord-wise VAP membrane overlaps with the axial VAP membrane, and the other end overlaps with the second guide net; The second release cloth is located between the continuous felt and the VAP film; The second guide net is located on the flange platform of the main mold and completely covers the exhaust port at the front edge of the mold; at the same time, the exhaust port is pasted with a chord-wise VAP film; The side runners of the pultruded beam are located at the trailing and leading edges of the pultruded beam.

2. A system for eliminating bubbles between pouring layers of pultruded beams as claimed in claim 1, characterized in that: The continuous felt is laid in a butt-jointed manner, and the continuous felt protrudes from the edge of the pultruded beam by at least 50 mm on all sides.

3. A system for eliminating bubbles between pouring layers of pultruded beams as claimed in claim 1, characterized in that: The laying width of the VAP mold is 150 mm, the chord-wise VAP membrane width is 100 mm and is laid evenly at a set distance; At the same time, one end of the chord-wise VAP membrane overlaps the axial VAP membrane by at least 50 mm, and the other end overlaps the second guide net by at least 50 mm.

4. A system for eliminating bubbles between pouring layers of pultruded beams as claimed in claim 1, characterized in that: The pultruded beam is composed of multiple layers of pultruded beam sheets and pultruded beam interlayer cloths laid in staggered layers; Among them, the total width of the interlayer cloth of the pultruded beam is at least 60mm greater than the total width of the pultruded beam, and the two sides of the interlayer cloth of the pultruded beam exceed the edge of the pultruded beam by at least 30mm.

5. A system for eliminating bubbles between pouring layers of pultruded beams as claimed in claim 1, characterized in that: The first pultruded beam side flow channel at the rear edge of the pultruded beam is 50-100mm away from the edge of the pultruded beam, and the first pultruded beam side flow channel at the leading edge of the pultruded beam is 80-150mm away from the beam edge.

6. A system for eliminating bubbles between pouring layers of pultruded beams as claimed in claim 1, characterized in that: It also includes that if the number of fabric layers below the pultruded beam is greater than n, only a continuous felt in contact with the pultruded beam is provided.

7. A method for eliminating bubbles between pouring layers of pultruded beams as claimed in claim 1, characterized in that: The method also includes replacing the second guide net with a rubber absorption felt.

8. A system for eliminating bubbles between pouring layers of pultruded beams as claimed in claim 1, characterized in that: It also includes adding an axial sealing strip on the guide net to block the glue, which is used to reduce the difference in glue flow rate between the upper and lower areas of the pultruded beam structure and reduce the risk of the pultruded beam being wrapped.

9. A method for eliminating bubbles between pouring layers of a pultruded beam based on the system for eliminating bubbles between pouring layers of a pultruded beam as claimed in claim 1, characterized in that: Check the straightness of the pultruded beam sheet. If the middle part between the pultruded beam sheets is greater than 5mm, replace it; When the mold is empty, mark the positioning area of ​​the pultruded beam and lay the continuous felt. The continuous felt is laid in a butt-jointed manner and the continuous felt is at least 50mm beyond the edge of the pultruded beam to absorb the bubbles between the pultruded sheet layers onto the continuous felt. If the number of layers under the pultruded beam is greater than n, the continuous felt is not laid. A 150mm wide axial VAP mold is laid under the continuous felt and flush with the leading edge of the continuous felt; at the same time, a 100mm wide chord-wise VAP membrane is laid every 5m in the chord-wise direction, one end of which overlaps the axial VAP membrane by 50mm, and the other end overlaps the second guide net or the adhesive felt to cover the air extraction port, which is used to guide out the bubbles on the continuous felt; After the continuous felt and VAP membrane are laid, the outer skin is laid, the pultruded beam is hoisted, the inner skin, the first release cloth, the porous membrane, the first guide net, the second release cloth and the second guide net are laid; at the same time, a pultruded beam edge flow channel is set at the rear edge and the leading edge of the pultruded beam for pouring glue.

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