Cloth paving device and compaction tool for preventing wind power blade rear edge corner cloth layer from being suspended

Abstract

The utility model relates to a cloth paving device and a compaction tool for preventing a cloth layer at a trailing edge corner of a wind power blade from being suspended, the cloth paving device comprises a mold and the compaction tool, the mold is used for forming a mold corner of the trailing edge corner, and a filling layer used for filling a suspended space between the mold corner and the cloth layer during cloth paving is arranged in the mold corner. The filling layer is of an arc groove structure extending in the length direction of the blade, the outer circumferential face of the arc groove is tightly attached to the corner of a mold, and the inner circle face and the outer circle face of the filling layer are in smooth transition connection in the inner circumferential direction of the arc groove through a chamfer slope at the edge of the filling layer. And the compaction tool is used for rolling and pressing the cloth layer at the corner of the mold. According to the utility model, suspension, cavities, rich resin and bubbles during the forming of the rear edge corner can be eliminated.

Description

Technical Field

[0001] The utility model relates to the technical field of wind turbine blade production and manufacturing, in particular to a laying device and a compaction tooling for preventing the cloth layer at the trailing edge corner of a wind turbine blade from being suspended. Background Technique

[0002] With the development of the times, the country and enterprises have continuously attached importance to the research of renewable energy. Wind power generation is one of the main directions of new energy development. The essential component of wind turbine power generation is the wind turbine blade. The quality and reliability of the blade directly affect the stability and service life of the wind turbine operation. The wind turbine blade includes a windward surface (PS surface) and a leeward surface (SS surface). Due to the special shape of the trailing edge corner of the blade, it is not easy for the fiberglass cloth layer to fit with the mold during the production process, and cavities are easily formed. After pouring, rich resin or bubbles are formed outside the blade or in the middle of the cloth layer, affecting the quality and reliability of the blade, and the defects are not easy to identify; maintenance not only causes quality losses but also affects the production progress of the blade. Summary of the Invention

[0003] In order to solve the defects of rich resin and bubbles at the trailing edge corner caused by the suspension of the cloth layer at the trailing edge corner of the wind turbine blade, the utility model proposes a laying device and a compaction tooling for preventing the cloth layer at the trailing edge corner of the wind turbine blade from being suspended.

[0004] The purpose of the utility model and the solution to its technical problems are achieved by adopting the following technical solutions. The compaction tooling for preventing the cloth layer at the trailing edge corner of the wind turbine blade from being suspended according to the utility model includes a handle and a pressing part fixed at the end of the handle. The pressing part is in a "boat shape" and can fit with the mold corner forming the trailing edge corner of the blade, and is used to roll and compact the cloth layer at the mold corner during cloth laying, so that the cloth layer at the mold corner is closely attached to both the mold and between the cloth layers; the handle is connected to the upper end surface of the pressing part, and there is an included angle of 70-80° between the handle and the upper end surface.

[0005] The object of the present utility model and the technical problems to be solved are achieved by the following technical solutions. A laying method for preventing the cloth layer at the trailing edge corner of a wind turbine blade from being suspended includes the following steps: 1) A filling layer is provided at the trailing edge corner of the empty mold. The filling layer has an arc groove structure extending along the blade length direction, and the outer peripheral surface of the arc groove closely adheres to the mold corner. At the edge of the filling layer, the inner circular surface and the outer circular surface of the filling layer are smoothly connected by a chamfered inclined surface along the inner circumferential direction of the arc groove; 2) Start laying the cloth layer by layer in the mold provided with the filling layer above, complete the cloth layer laying, and compact the cloth layer at the mold corner during each layer of cloth laying; 3) Lay auxiliary materials for perfusion in the mold where the cloth layer laying is completed above, and then place a corner-shaped rubber strip tooling at the mold corner. The corner-shaped rubber strip tooling has a shape that fits the mold corner; 4) Lay a vacuum bag film to establish a vacuum system, and perform pressure-maintaining perfusion, so that the corner-shaped rubber strip tooling can continuously compact the mold corner under the action of the vacuum pressure during perfusion.

[0006] The object of the present utility model and the technical problems to be solved can also be further achieved by the following technical measures.

[0007] In the above-mentioned laying method for preventing the cloth layer at the trailing edge corner of a wind turbine blade from being suspended, in step 4), the pressure-maintaining during perfusion is achieved by bonding the vacuum film bag to the mold flange with a sealing rubber strip.

[0008] In the above-mentioned laying method for preventing the cloth layer at the trailing edge corner of a wind turbine blade from being suspended, the filling layer has a thickness of 1.8 - 3.6 mm, and the length of the outer circular surface of the filling layer is 200 - 300 mm. And in the circumferential direction of the filling layer, there is a stagger of 25 - 50 mm between the two ends of the inner circular surface and the outer circular surface; in the extending direction of the filling layer, there is a stagger of 250 - 500 mm between the two ends of the inner circular surface and the outer circular surface.

[0009] In the above-mentioned laying method for preventing the cloth layer at the trailing edge corner of a wind turbine blade from being suspended, the filling layer is composed of 3 - 6 layers of narrow strip fiberglass cloth, and there is a stagger of 5 - 10 mm between adjacent layers of narrow strip fiberglass cloth in the circumferential direction of the filling layer, and a stagger of 50 - 100 mm in the extending direction of the filling layer.

[0010] In the above-mentioned laying method for preventing the cloth layer at the trailing edge corner of a wind turbine blade from being suspended, adjacent layers of narrow strip fiberglass cloth are bonded and fixed by spraying glue.

[0011] In the above-mentioned laying method for preventing the cloth layer at the trailing edge corner of a wind turbine blade from being suspended, the filling layer can be demolded integrally with the mold and reused.

[0012] The utility model has obvious advantages and beneficial effects compared with the prior art. By means of the above technical solution, the utility model can achieve quite high technical progressiveness and practicability, and has wide application value in the industry. It has at least the following advantages:

[0013] By adding a filling layer at the mold corners of the empty mold, the utility model makes the mold corners form an approximate large fillet transition structure, eliminates the space between the cloth layer and the mold corners when laying the cloth layer, and prevents the cloth layer from hanging in the air at the mold corners. The utility model also rolls the cloth layer laid at the mold corners through a special tooling to further eliminate the gaps between adjacent cloth layers at the mold corners and between the cloth layer and the mold and the filling layer. Finally, the utility model also sets a corner conforming rubber strip tooling at the mold corners after laying is completed, so that the tooling can press the mold corners tightly under the action of vacuum during vacuum infusion. Thus, through layer-by-layer design, a trailing edge corner structure without cloth layer hanging in the air, cavities, resin-rich corners and bubbles is completed. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the composition of a wind turbine blade of the utility model;

[0015] Figure 2 is Figure 1 an enlarged view of the trailing edge corner in

[0016] Figure 3 It is a schematic diagram of the mold for the trailing edge corner of the blade of the utility model;

[0017] Figure 4 It is a schematic diagram of the mold for compacting the cloth at the trailing edge corner of the utility model;

[0018] Figure 5 It is a schematic diagram of compacting the cloth at the trailing edge corner of the utility model;

[0019] Figure 6 It is a schematic diagram of the state of the trailing edge corner of the utility model to be subjected to vacuum infusion;

[0020] Figure 7 It is a schematic diagram of the mold for the trailing edge corner of the blade in another embodiment of the invention.

[0021]

DESCRIPTION OF THE MAIN ELEMENT SYMBOLS

[0022] 1. Windward side of the blade, 2. Leeward side of the blade, 3. Trailing edge corner, 31. Mold, 32. Filling layer, 4. Handle, 5. Pressing part, 6. Auxiliary material, 7. Corner conforming rubber strip tooling, 8. Vacuum bag film, 9. Mold flange, 10. Sealing strip, 11. Glue injection pipeline, 12. Chamfered slope. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] To further elaborate on the technical means and effects adopted by the present utility model to achieve the intended invention purpose, the following, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation manner, structure, features, and effects of the laying device for preventing the cloth layer at the trailing edge corner of a wind turbine blade from being suspended, as follows.

[0024] Please refer to Figure 1 , which is a schematic diagram of the composition of a wind turbine blade. The wind turbine blade is mainly composed of a blade windward surface 1 and a blade leeward surface 2 bonded together with an adhesive. At the trailing edge of the blade, a trailing edge corner 3 with an almost right-angled cross-section is formed at the connection between the blade leeward surface 2 and the blade windward surface 1. When the blade leeward surface 2 is formed through a mold, the position on the mold 31 for forming the trailing edge corner 3 also has a corresponding mold corner. As a result, after the fiberglass cloth layer is laid on the mold 31, due to the characteristics of the fiberglass itself, it is easy to loosen and twist, making it difficult to fit the mold corner. This causes a suspension between the fiberglass cloth layer and the mold 31 at the mold corner, thereby affecting the molding quality and causing quality defects.

[0025] Please refer to Figures 3 - 6 , the laying device for preventing the cloth layer at the trailing edge corner of a wind turbine blade according to the present utility model includes a mold 31 for forming the blade leeward surface 2. A filling layer 32 is provided at the mold corner of the mold 31, and the filling layer 32 is integrally in the form of an arc groove structure extending along the blade length direction.

[0026] If multiple layers of fiberglass cloth are laid in a staggered manner, a filling layer 32 is formed within the mold corner. The multiple layers of fiberglass cloth are staggered in both the blade length and width directions to form a chamfered slope. Through the chamfered slope, a smooth transition connection is achieved between the inner surface of the arc of the filling layer 32 and the mold 31, so that a structure similar to a large-diameter rounded corner is formed at the mold corner, enabling the subsequent laid fiberglass cloth to closely adhere to the mold and the filling layer 32, preventing the generation of suspension. The outer circumferential surface of the arc of the filling layer 32 is closely attached to the inside of the mold corner. At the edge of the filling layer 32, a smooth transition connection along the inner circumferential direction of the arc groove is achieved between the inner and outer circular surfaces of the filling layer 32 through a chamfered slope.

[0027] Preferably, the filling layer 32 has a thickness of 1.8 - 3.6 mm, and the circumference L of the outer circular surface of the filling layer 32 is 200 - 300 mm. In the circumferential direction of the filling layer 32 (blade width direction), there is a 25 - 50 mm stagger between the two ends of the inner circular surface and the outer circular surface of the filling layer, and a first chamfered slope 12 is formed at this stagger; in the extending direction of the filling layer 32 (blade length direction), there is a 250 - 500 mm stagger between the two ends of the inner circular surface and the outer circular surface of the filling layer 32, and a second chamfered slope is formed at this stagger.

[0028] In this embodiment, the filling layer is composed of 3 - 6 layers of narrow - strip fiberglass cloth. The narrow - strip fiberglass cloth is preferably biaxial fiberglass cloth. There is a stagger of 50 - 100 mm in the length direction of the wind turbine blade between adjacent layers of narrow - strip fiberglass cloth, and a stagger of 5 - 10 mm in the width direction of the wind turbine blade. The arrangement of the stagger can make the inner arc surface of the filling layer 32 transition smoothly with the mold, enabling the subsequent cloth layer to closely adhere to the mold and the filling layer, and also avoiding stress concentration caused by the formation of step - like accumulations in the cloth layer.

[0029] In the embodiment of the present utility model, the first layer of narrow - strip fiberglass cloth is fixed and bonded at the corner of the mold using spray adhesive, and adjacent layers of narrow - strip fiberglass cloth are fixed and bonded using spray adhesive to prevent movement.

[0030] In the embodiment of the present utility model, the filling layer 32 composed of narrow - strip fiberglass cloth arranged in the mold 31 can not only eliminate the suspension between the trailing - edge corner and the mold during the laying of the shell cloth, but also be integrally formed with the shell cloth layer during the infusion molding, realizing the structural reinforcement of the trailing - edge corner of the blade.

[0031] In another embodiment of the present utility model, the filling layer 32 is prepared from other materials. It cannot absorb the epoxy resin infused during molding and will not be integrally formed with the shell cloth layer. It is only used as a structure to fill the suspended space, and this filling layer 32 can also be reused. The filling layer 32 can be integrally formed with the mold to form an improved mold capable of eliminating the suspended space, or can be adhesively fixed at the corner of the mold to make up for the defects of the existing mold. Please refer to Figure 7 .

[0032] The setting of the filling layer 32 of the present utility model makes the corner of the mold form a structure similar to a large - diameter rounded - corner transition, enabling the fiberglass cloth to better adhere to the mold and the filling layer during cloth laying, reducing the generation space of suspension at the corner of the mold. To further prevent the generation of suspension at the corner of the mold, the cloth - laying device of the present utility model further includes a compaction tooling. This compaction tooling is used to compact the cloth laid at the corner of the mold. The compaction tooling includes a handle 4 for applying force and a pressing part 5 connected to the end of the handle 4. The pressing part 5 has a shape capable of fitting the corner of the mold. Specifically, the pressing part 5 has a structure that is smaller at the bottom and larger at the top, and the side surfaces connecting the upper and lower end faces of the pressing part 5 are all inclined surfaces, making the pressing part 5 in a "boat - shape", and the upper end face of the pressing part 5 is fixedly connected to the handle 4, and the lower end and the inclined side walls can fit the corner of the mold. The material of the handle 4 has a certain strength. Preferably, the handle 4 is a steel pipe, and the pressing part 5 is also made of steel.

[0033] When laying the fiberglass cloth on the shell of the present utility model, when laying each layer of fiberglass cloth, the above-mentioned compaction tooling is used to press the fiberglass cloth at the trailing edge corner, which can make the fiberglass cloth at this place closely adhere to the mold and the filling layer 32, eliminating the existence of suspension.

[0034] When pressing the fiberglass cloth at the mold corner, the operator holds the handle 4 and rolls and compacts the cloth layer along the mold corner through the pressing part 5 at the front end, so that different layers of fiberglass cloth laid on the mold 31 are closely adhered at the mold corner, realizing non-suspended cloth laying.

[0035] In the embodiment of the present utility model, there is an included angle α between the handle 4 of the compaction tooling and the upper end surface of the pressing part 5. Preferably, the included angle α is 70-80°, which makes it more convenient to apply force when the compaction tooling rolls and compacts the cloth layer. Specifically, the two inclined surfaces connecting the upper end surface and the bottom wide edge of the pressing part 5 can be fitted with the chamfers at both ends in the width direction of the filling layer 32, and the bottom of the pressing part 5 can enter the inner arc surface of the filling layer 32, so that when rolling and compacting the cloth at the corner through the compaction tooling, the pressing part can make the fiberglass cloth fit with the inner arc surface, chamfer surface of the filling layer 32 and the mold chamfer, without suspension.

[0036] The cloth laying device of the present utility model further includes a corner conforming rubber strip tooling 7. One corner of the corner conforming rubber strip tooling 7 is basically the same as the corner of the blade mold and can completely fit the corner of the blade mold. After the fiberglass cloth layer is laid and the corner is compacted, auxiliary materials 6 are sequentially laid on the laid fiberglass cloth layer, the corner conforming rubber strip tooling 7 is placed, vacuum is established, and pressure is maintained for perfusion. Specifically, first, the auxiliary materials 6 for blade perfusion are laid on the laid cloth layer, and then the corner conforming rubber strip tooling 7 is placed at the mold corner, so that the corner conforming rubber strip tooling 7 is attached to the auxiliary materials 6 located at the mold corner. At this time, the filling layer 32, the fiberglass cloth layer, the auxiliary materials 6 and the corner conforming rubber strip tooling 7 are sequentially arranged from bottom to top at the mold corner. Finally, a vacuum system is established by laying a vacuum bag film 8, and the vacuum film bag 8 is pasted on the mold flange 9 through a sealing strip 10 for pressure maintaining, and then epoxy resin is injected into the vacuum system through the injection pipeline 11 on the vacuum film bag 8 by using a perfusion device for perfusion molding. The corner conforming rubber strip tooling 7 fits with the trailing edge mold corner, and can continuously compact the fiberglass cloth layer and the auxiliary materials 6 at the trailing edge mold corner under the action of vacuum pressure, further eliminating the suspension of the corner cloth layer, and solving the problems of cavity, suspension, rich resin and bubbles at the trailing edge corner of the blade.

[0037] The above are only the preferred embodiments of the present utility model, and do not impose any form of limitation on the present utility model. Although the present utility model has been disclosed above with the preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art, within the scope of the technical solution of the present utility model, can make some changes or modifications to the above-disclosed technical content to obtain equivalent embodiments with equivalent changes. However, as long as it does not depart from the technical solution of the present utility model, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present utility model still fall within the scope of the technical solution of the present utility model.

Claims

1. A compaction tool for preventing the cloth layer at the trailing edge corner of a wind turbine blade from being suspended, characterized in that: It includes a handle and a pressing part fixed at the end of the handle. The pressing part is in a "boat shape" and can fit with the mold corner forming the trailing edge corner of the blade, and is used to roll and compact the cloth layer at the mold corner during cloth laying, so that the cloth layer at the mold corner fits tightly between the mold and between the cloth layers; the handle is connected to the upper end surface of the pressing part, and there is an angle of 70-80° between it and the upper end surface.

2. A laying device for preventing the cloth layer at the trailing edge corner of a wind turbine blade from being suspended, characterized in that, It includes a mold and the compaction tooling described in claim 1, and a filling layer for filling the suspended space between the mold corner and the cloth layer during cloth laying is provided in the mold corner of the mold for forming the trailing edge corner. The filling layer is in an arc groove structure extending along the length direction of the blade, and the outer peripheral surface of the arc groove is closely attached to the mold corner. At the edge of the filling layer, the inner circular surface and the outer circular surface of the filling layer are smoothly connected by a chamfered inclined surface along the circumferential direction of the arc groove.

3. The laying device for preventing the trailing edge corner cloth layer of a wind turbine blade from being suspended according to claim 2, characterized in that, The filling layer has a thickness of 1.8-3.6 mm, and the length of the outer circular surface of the filling layer is 200-300 mm. In the circumferential direction of the filling layer, there is a stagger of 25-50 mm between the two ends of the inner circular surface and the outer circular surface; in the extending direction of the filling layer, there is a stagger of 250-500 mm between the two ends of the inner circular surface and the outer circular surface.

4. The laying device for preventing the cloth layer at the trailing edge corner of a wind turbine blade from being suspended according to claim 3, wherein The filling layer is formed by arranging 3-6 layers of narrow strip fiberglass cloth in a staggered manner, and there is a stagger of 5-10 mm between adjacent layers of narrow strip fiberglass cloth in the circumferential direction of the filling layer, and a stagger of 50-100 mm in the extending direction of the filling layer.

5. The laying device for preventing the trailing edge corner cloth layer of a wind turbine blade from being suspended according to claim 4, wherein Adjacent layers of narrow strip fiberglass cloth are bonded and fixed by spraying glue.

6. The laying device for preventing the cloth layer at the trailing edge corner of the wind turbine blade from being suspended according to claim 3, wherein, The filling layer can be demolded integrally with the mold and reused.

7. The laying device for preventing the trailing edge corner cloth layer of a wind turbine blade from being suspended according to claim 6, characterized in that, The filling layer is integrally formed with the mold.

8. The laying device for preventing the cloth layer at the trailing edge corner of a wind turbine blade from being suspended, according to any one of claims 2-7, is characterized in that It further includes a corner conforming rubber strip tooling, which has a shape that can fit with the mold corner and is used to press the cloth layer at the mold corner during vacuum infusion.

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