UD pouring dry yarn method for eliminating ultra-high mold on trailing edge cork wood chamfer and wind power blade

Abstract

The invention relates to the technical field of wind power blade production, and discloses a method for eliminating ultra-high modulus UD pouring dry yarn on a rear edge cork wood chamfer and a wind power blade, and the method comprises the following steps: S1, adjusting a glass fiber raw material braided wire crossing mode and a braided wire stitch spacing to optimize the tightness of yarn bundles, and improving the chemical bonding rate between glass fibers and resin by increasing wettability; s2, ultrahigh-modulus UD cloth is laid in the rear edge cork wood chamfering area in a staggered mode; s3, removing the chordwise straight shallow grooves in the lower surface of the balsa wood; s4, laying a VAP air exhaust bag in the resin turn-up convergence area; s5, laying a low-gram-weight flow guide net in the chamfered area of the cork wood; s6, a vacuum film and a vacuumizing pipeline are arranged on the blade skin, and vacuumizing operation is conducted; and S7, after the vacuumizing operation is qualified, opening a flow channel on the front edge side of the ultra-high mold UD, and pouring resin in cooperation with a valve. The problem of semi-dry yarn or dry yarn in the ultra-high modulus UD composite layer is effectively solved.

Description

Technical Field

[0001] The invention relates to the technical field of wind turbine blade production, and in particular to a method for eliminating ultra-high modulus UD infusion dry yarn on a trailing edge balsa wood chamfer and a wind turbine blade. Background Art

[0002] In the process of wind turbine blade manufacturing, the requirements for blade structural strength are getting higher and higher. Ultra-high modulus and high-weight fiber cloth are used more and more frequently in the shell laying process. As a result, the fiber cloth is increasingly difficult to penetrate during the infusion process, and the requirements for process design are becoming more and more stringent. In the trailing edge balsa wood chamfer area, the blade tensile mechanical structure is strengthened by adding non-prefabricated ultra-high modulus UD. At the same time, this area is the blade bonding area and also bears the blade shear force. After the infusion of this structural area, it is often semi-dry yarn or dry yarn between layers. The existing technology has not conducted in-depth research on the resin flow rate and wettability of the resin in the ultra-high modulus UD composite layer composed of ultra-high modulus UD and core material chamfers. The flow rate and wettability of the resin in the ultra-high modulus UD composite layer were not studied first, and then the auxiliary material layout and the switch glue requirements during the infusion process were adjusted to balance the difference between the resin flow rate and wettability, so as to eliminate the problem of semi-dry yarn or dry yarn in the ultra-high modulus UD composite layer. 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 for eliminating the ultra-high modulus UD infused dry yarn on the trailing edge balsa wood chamfer and a wind turbine blade, aiming to eliminate the problem of semi-dry yarn or dry yarn in the ultra-high modulus UD composite layer.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solution: The present invention provides a method for eliminating ultra-high modulus UD infused dry yarn on the rear edge balsa wood chamfer, comprising the following steps: S1. Adjust the crossover mode of the glass fiber raw material weaving wire and the spacing of the weaving wire pins to optimize the tightness of the yarn bundle, and increase the chemical bonding rate between the glass fiber and the resin by increasing the wettability; S2. Lay ultra-high modulus UD cloth in staggered layers in the rear edge balsa wood chamfer area; S3. Remove the shallow groove in the chord direction on the lower surface of the balsa wood; S4. Lay VAP vacuum bags in the resin reverse package gathering area; S5. Lay a low-weight guide net on the chamfered area of ​​balsa wood; S6. Arrange a vacuum film and a vacuum evacuation pipeline on the blade skin to perform a vacuum evacuation operation; S7. After the vacuum operation is qualified, open the front edge side flow channel of the ultra-high mold UD and cooperate with the valve to inject resin.

[0005] Furthermore, the front and rear edges of the VAP vacuum bag extend beyond the resin reverse package convergence area by 30-50 mm respectively.

[0006] Furthermore, an exhaust ear is laid at a set distance in the chord direction of the blade, the exhaust ear is overlapped with the VAP exhaust bag in the blade cavity, and the rear edge side of the exhaust ear is laid on the exhaust hole at the exhaust position of the flange platform.

[0007] Furthermore, the cross section of the rubber in the exhaust pipe is monitored, and when the cross section of the rubber is larger than one third of the cross section of the exhaust pipe, it is replaced to avoid exhaust failure.

[0008] Furthermore, the step S5 also includes checking whether VAP vacuum bags have been laid in the balsa wood chamfered area, and if so, the laying of the guide net is cancelled.

[0009] Furthermore, the resin flow channel on the leading edge side of the ultra-high modulus UD region is 150-200 mm away from the ultra-high modulus UD laying region.

[0010] Furthermore, it also includes laying a VAP film or an adhesive material in the resin backpacking convergence area.

[0011] Furthermore, the continuous felt laid under the prefabricated auxiliary beam is eliminated.

[0012] Furthermore, during the infusion process, when the resin on the upper surface of the flow channel on the leading edge of the UHMO UD flows to half the width of the UHMO UD, the resin flow rate and the chemical bonding rate are balanced by controlling the number and interval time of opening and closing the valve.

[0013] Furthermore, when the resin on the upper surface of the side flow channel at the leading edge of the UHMO UD flows to half the width of the UHMO UD, close the valve, wait for 3-5 minutes, open 1 / 2 of the valve for 3-5 minutes, close the valve again and wait for 3-5 minutes, and repeat this cycle 3-4 times to balance the difference between the resin flow rate and the chemical bonding rate between the UHMO UD and the resin.

[0014] A wind turbine blade adopts a method of eliminating ultra-high modulus UD infusion dry yarn on a trailing edge balsa wood chamfer.

[0015] The beneficial effects of the present invention are: 1. The vacuum port is covered with VAP film and the VAP vacuum bag is connected to the flange platform vacuum system to ensure the fluidity of the resin during the infusion process and reduce the gas residue in the reverse area.

[0016] 2. By controlling the weaving method and wettability of the glass fiber raw materials, ensure that the resin and glass fiber can be quickly combined.

[0017] 3. By adjusting the timing and size of the glue switch during the infusion process, as well as the positioning of the infusion auxiliary materials, the balance between the resin flow rate and the chemical bonding rate can be ensured to avoid uneven resin distribution. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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.

[0019] Figure 1 A flow chart of a method for eliminating ultra-high modulus UD infused dry yarn on a trailing edge balsa wood chamfer provided by an embodiment of the present invention. 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 method for eliminating ultra-high modulus UD infused dry yarn on the rear edge balsa wood chamfer, comprising the following steps: S1. Adjust the cross pattern of the glass fiber raw material weaving wire and the spacing of the weaving wire pins to optimize the tightness of the yarn bundle, and increase the chemical bonding rate between the glass fiber and the resin by increasing the wettability. It should be noted that: During the weaving process, adjusting the crossing pattern of the weaving wires and the spacing between the stitches of the weaving wires will affect the tightness of the yarn bundles, thereby balancing the flow trend of the resin and the chemical bonding between the glass fiber and the resin; during the weaving process of the glass fiber raw materials, the chemical bonding rate between the glass fiber and the resin can be effectively improved by increasing the wettability.

[0023] Furthermore, the continuous felt laid under the prefabricated auxiliary beam can be eliminated to reduce the difference in resin flow rate between the upper and lower regions of the ultra-high modulus UD composite layer, thereby reducing the risk of the ultra-high modulus UD composite layer being blocked during the infusion process.

[0024] S2. Ultra-high modulus UD cloth is laid in staggered layers in the rear edge balsa wood chamfer area to facilitate resin flow. It should be noted that: The fault formed at the position of the cloth layer will hinder the normal flow of resin and cause local imbalance in infusion. In addition, the amount of glue sprayed during the laying process is controlled to avoid the strong adhesion of glass fiber affecting the chemical combination of resin and glass fiber. This step ensures the uniformity of resin flow during the infusion process by curing the laying of ultra-high modulus UD cloth.

[0025] S3. Remove the shallow groove in the chord direction on the lower surface of the balsa wood to slow down the flow rate of the resin on the lower surface of the core material and reserve time for the chemical combination between the resin and the glass fiber. It should be noted that: A shallow groove in the direction of the chord is opened on the lower surface of the balsa wood. The resin flows faster along the groove and can be quickly wrapped from the lower surface to the glass fiber on the upper surface of the core material, causing partial wrapping of the glass fiber. The shallow groove in the direction of the chord on the lower surface of the balsa wood is removed, which effectively slows down the flow rate of the resin on the lower surface of the core material and ensures that the resin is pushed flat as a whole. The shallow groove in the direction of the chord on the lower surface of the balsa wood is removed, which slows down the flow rate of the resin and reserves time for the chemical combination of the resin and the glass fiber.

[0026] S4. Lay VAP vacuum bags in the resin backpacking area. It should be noted that: The front and rear edges of the VAP vacuum bag extend beyond the resin backfill convergence area by 30-50mm respectively; a vacuum ear is laid every 4m in the chord direction of the blade, and the vacuum ear is overlapped with the VAP vacuum bag in the blade cavity. The rear edge of the vacuum ear is laid on the vacuum hole at the vacuum point of the flange platform to increase the resin flow power in the resin backfill convergence area, reduce the gas in the resin backfill convergence area, and continuously and stably provide the vacuum degree in the ultra-high modulus UD composite layer area; monitor the cross section of the rubber in the vacuum pipe, and replace it when the cross section of the rubber is larger than one-third of the cross section of the vacuum pipe to avoid vacuum failure.

[0027] The VAP vacuum bag can also be replaced with a VAP film or a suction adhesive material.

[0028] S5. Lay a low-weight flow guide net in the chamfered area of ​​balsa wood. It should be noted that: Check whether VAP vacuum bags have been laid in the balsa wood chamfer area. If so, cancel the laying of the guide net; the resin flow channel on the leading edge of the ultra-high modulus UD area is 150-200mm away from the ultra-high modulus UD laying area; the low-weight guide net in the balsa wood chamfer area can also be replaced with a high-weight guide net, suction glue or continuous felt.

[0029] S6. Arrange vacuum membrane and vacuum pipe on the blade skin and perform vacuum operation to ensure that the resin can penetrate into the fiber cloth smoothly during the infusion process. It should be noted that: In the process of laying the vacuum film, a double-layer vacuum film is used, in which one layer of vacuum film covers the entire mold surface, and the second layer of vacuum film covers 50% of the connection port, providing secondary protection, which can reduce the risk of air leakage.

[0030] S7. After the vacuuming operation is qualified, open the front side flow channel of the ultra-high mold UD and pour the resin in coordination with the valve. It should be noted that: During the infusion process, when the resin on the upper surface of the flow channel on the leading edge of the UHMO UD flows to half the width of the UHMO UD, the resin flow rate and the chemical bonding rate are balanced by controlling the number and interval time of valve opening and closing.

[0031] Furthermore, when the resin on the upper surface of the side flow channel at the leading edge of the UHMO UD flows to half the width of the UHMO UD, close the valve, wait for 3-5 minutes, open 1 / 2 of the valve for 3-5 minutes, close the valve again and wait for 3-5 minutes, and repeat this cycle 3-4 times to balance the difference between the resin flow rate and the chemical bonding rate between the UHMO UD and the resin.

[0032] The present invention effectively avoids the problem of semi-dry yarn or dry yarn in the ultra-high modulus UD composite layer by improving the chemical bonding rate between the balanced resin flow rate and the glass fiber, the uniformity of the resin flow during the infusion process, and the gas enrichment in the composite area of ​​the ultra-high modulus UD reinforcement layer.

[0033] Example 2

[0034] Based on Example 1, at the overlapping part between the vacuum ear and the vacuum hole of the VAP vacuum bag, the original overlapping method is replaced by laying a guide net on the platform and fixing it with an absorbent adhesive material. The guide net can help the resin flow better and ensure that the air around the vacuum hole can be effectively discharged. The absorbent adhesive material can enhance the fixing effect of the guide net and prevent displacement during the infusion process.

[0035] Example 3

[0036] Based on Example 1, this example also provides a wind turbine blade obtained by eliminating the ultra-high modulus UD infusion dry yarn method on the trailing edge balsa wood chamfer.

[0037] 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 method for eliminating ultra-high modulus UD infusion dry yarn on the rear edge balsa wood chamfer, characterized in that: The following steps are involved: S1. Adjust the crossover mode of the glass fiber raw material weaving wire and the spacing of the weaving wire pins to optimize the tightness of the yarn bundle, and increase the chemical bonding rate between the glass fiber and the resin by increasing the wettability; S2. Lay ultra-high modulus UD cloth in staggered layers in the rear edge balsa wood chamfer area; S3. Remove the shallow groove in the chord direction on the lower surface of the balsa wood; S4. Lay VAP vacuum bags in the resin reverse package gathering area; S5. Lay a low-weight guide net on the chamfered area of ​​balsa wood; S6. Arrange a vacuum film and a vacuum evacuation pipeline on the blade skin to perform a vacuum evacuation operation; S7. After the vacuum operation is qualified, open the front edge side flow channel of the ultra-high mold UD and cooperate with the valve to inject resin.

2. The method for eliminating the ultra-high modulus UD infusion dry yarn on the trailing edge balsa wood chamfer according to claim 1 is characterized in that: The front and rear edges of the VAP vacuum bag extend 30-50mm beyond the resin backfill convergence area.

3. The method for eliminating the ultra-high modulus UD infusion dry yarn on the trailing edge balsa wood chamfer according to claim 2, characterized in that: An exhaust ear is laid at a set distance in the chord direction of the blade. The exhaust ear is overlapped with the VAP exhaust bag in the blade cavity, and the rear edge side of the exhaust ear is laid on the exhaust hole at the exhaust position of the flange platform.

4. The method for eliminating the ultra-high modulus UD infusion dry yarn on the trailing edge balsa wood chamfer according to claim 3 is characterized in that: Monitor the cross section of the rubber in the exhaust pipe. When the cross section of the rubber is larger than one-third of the exhaust pipe cross section, replace it to avoid exhaust failure.

5. The method for eliminating the ultra-high modulus UD infusion dry yarn on the trailing edge balsa wood chamfer according to claim 1, characterized in that: The step S5 also includes checking whether a VAP vacuum bag has been laid in the balsa wood chamfered area, and if so, canceling the laying of the guide net.

6. The method for eliminating the ultra-high modulus UD infusion dry yarn on the trailing edge balsa wood chamfer according to claim 1, characterized in that: The resin flow channel on the leading edge side of the ultra-high modulus UD area is 150-200mm away from the ultra-high modulus UD laying area.

7. The method for eliminating the ultra-high modulus UD infusion dry yarn on the trailing edge balsa wood chamfer according to claim 1, characterized in that: It also includes laying VAP film or adhesive material in the resin backpacking convergence area.

8. The method for eliminating the ultra-high modulus UD infusion dry yarn on the trailing edge balsa wood chamfer according to claim 1, characterized in that: Cancel the continuous felt laid under the prefabricated auxiliary beams.

9. The method for eliminating the ultra-high modulus UD infusion dry yarn on the trailing edge balsa wood chamfer according to claim 1, characterized in that: During the infusion process, when the resin on the upper surface of the flow channel on the leading edge of the UHMO UD flows to half the width of the UHMO UD, the resin flow rate and the chemical bonding rate are balanced by controlling the number and interval time of valve opening and closing.

10. The method for eliminating the ultra-high modulus UD infusion dry yarn on the trailing edge balsa wood chamfer according to claim 9, characterized in that: When the resin on the upper surface of the flow channel on the leading edge of the UHMO UD flows to half the width of the UHMO UD, close the valve and wait for 3-5 minutes, then open 1 / 2 of the valve for 3-5 minutes, then close the valve and wait for 3-5 minutes, and repeat this cycle 3-4 times to balance the difference between the resin flow rate and the chemical bonding rate between the UHMO UD and the resin.

11. A wind turbine blade, characterized in that: The method for infusing ultra-high modulus UD dry yarn on the trailing edge balsa wood chamfer is adopted as described in any one of claims 1 to 10.

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