A method for manufacturing wind turbine blades without flash

Abstract

The invention discloses a method for manufacturing a flash-free wind turbine blade, comprising the following steps: installing a detachable mold boss on a flange boss of a mold flange; laying a product layer on a mold cavity of a blade mold according to a blade manufacturing process; trimming off the layer of the product layer that exceeds the mold cavity along the cutting edge; removing the detachable mold boss after half-piece curing and root cutting are completed; laying an exhaust medium on the mold flange, establishing a vacuum between the product layer and the mold flange, compacting and tightening, and completing half-piece vacuum adsorption; applying glue, gluing a web, and installing components to close the mold according to blade process requirements; after closing the mold, using a plastic scraper to remove and flatten excess adhesive on the outside of the closing mold connection; after closing the mold according to blade process requirements, curing, and demolding are completed to obtain a flash-free blade. This method can completely eliminate blade flash, thereby reducing flash cutting costs, improving post-processing flow efficiency, and eliminating the impact of flash cutting dust on the environment.

Description

Technical Field

[0001] The invention relates to the technical field of non-metal composite material processing and forming, and in particular to a method for manufacturing a flash-free wind turbine blade. Background Art

[0002] The bosses on the flange of the wind turbine blade mold are integrally formed with the blade mold and cannot be removed. When the wind turbine blade PS / SS half-piece is laid, the shell cloth layer will generally have 1-3 layers flipped out of the main mold cavity to the blade flange boss. After the half-piece is poured and solidified, it is necessary to establish a vacuum between the blade flange and the main mold to ensure that the half-piece of the product fits the mold completely without airfoil changes. After the blade is demolded, this flange forms a flash and needs to be cut off. At present, most manufacturers rely on manual cutting of flash, and some manufacturers are testing intelligent cutting equipment to cut flash. Both methods require investment in labor and equipment costs. Flash cutting takes about 1.5~2 hours, which affects the efficiency of blade post-processing circulation, and cutting flash will form a lot of dust and pollute the environment. Summary of the invention

[0003] In order to reduce the cost, blade post-processing efficiency and environmental protection problems caused by the flash cutting process of wind turbine blades, the present invention provides a flash-free wind turbine blade manufacturing method, which can completely eliminate the blade flash, thereby reducing the flash cutting cost, improving the post-processing efficiency, and eliminating the impact of flash cutting dust on the environment.

[0004] The technical solution adopted by the present invention is: a method for manufacturing a flashless wind turbine blade, comprising the following steps:

[0005] Step 1: Install the removable mold boss on the flange boss of the mold flange;

[0006] Step 2: Laying the product layer on the mold cavity of the blade mold according to the blade manufacturing process;

[0007] Step 3: After the layering is completed, the layering of the product that exceeds the mold cavity is trimmed along the cutting edge;

[0008] Step 4: Arrange the guide according to the process requirements to establish vacuum, and after the infusion, curing and blade root cutting are completed, remove the detachable mold boss;

[0009] Step 5: Lay the exhaust medium on the mold flange, and then stick a piece of sealing tape on the mold flange and the exposed part on the outside of the product layer respectively. Use two pieces of sealing tape to stick one by one on both sides of the vacuum bag film to establish vacuum between the product layer and the mold flange, compact and tighten, and complete half-sheet vacuum adsorption;

[0010] Step 6: Apply glue, stick the web, install the parts and close the mold according to the blade process requirements;

[0011] Step 7. After closing the mold, use a plastic scraper to remove and smooth the excess adhesive on the outside of the mold joint;

[0012] Step 8: According to the blade process requirements, the mold is closed and solidified, and after demoulding, a flash-free blade is obtained.

[0013] Furthermore, the flange boss is arranged at one end of the mold flange connected to the blade mold, and the flange boss is detachably mounted on the blade mold.

[0014] Furthermore, the end surface of the mold boss close to the mold cavity is an arc-shaped surface, and the arc-shaped surface smoothly transitions with the inner arc surface of the mold cavity.

[0015] Furthermore, the air extraction medium in step five is one of air-permeable felt and guide net.

[0016] The present invention has the following beneficial effects, which are manifested in the following aspects: The key technology of the present invention is to prepare a blade mold with a detachable mold boss, so that the cloth layer does not need to be flanging during laying, and when vacuum adsorption is established by mold closing, the detachable mold boss is removed, and vacuum adsorption is established between the product laying part exposed from the mold and the mold flange to ensure that the product laying is in close contact with the mold during the mold closing process. At the same time, after the mold closing, since the mold boss is removed, there is enough space to use a plastic scraper to collect the excess adhesive extruded by the mold closing, thereby eliminating the flash and extruded adhesive generated by the blade production. After the blade is demolded, there is no flash and no trimming is required. The flash-free blades made by the method of the present invention can reduce the labor and equipment cost investment in the trimming process, improve the efficiency of the blade post-processing circulation, and reduce the pollution of trimming dust to the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the invented blade when it is laid;

[0018] Figure 2 It is a schematic diagram of the structure of the invented half-sheet for establishing vacuum adsorption;

[0019] Figure 3 Schematic diagram of the structure when the mold is closed;

[0020] The graphic markings are: 1. mold cavity, 2. mold flange, 21. flange boss, 3. mold boss, 4. cutting edge, 5. product layer, 6. exhaust medium, 7. sealing tape, 8. vacuum bag film, 10. adhesive, 11. mold joint. DETAILED DESCRIPTION

[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, but the present invention is not limited to the scope of the embodiments.

[0022] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “rear”, “left”, “right”, “lateral” and “longitudinal” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0023] A method for manufacturing a flashless wind turbine blade comprises the following steps:

[0024] Step 1, install the detachable mold boss 3 on the flange boss 21 of the mold flange 2; the flange boss 21 is arranged at one end of the mold flange 2 connected to the blade mold, and the flange boss is detachably installed on the blade mold; the end surface of the mold boss 3 close to the mold cavity 1 is an arc surface, and the arc surface smoothly transitions with the inner arc surface of the mold cavity 1;

[0025] Step 2: Lay the product layer 5 on the mold cavity 1 of the blade mold according to the blade manufacturing process; the manufacturing process in this process is the current conventional manufacturing process, and the specific process details will not be introduced in detail in this patent;

[0026] Step 3: After the layering is completed, the layer-glass fiber cloth of the product layer 5 that exceeds the mold cavity 1 is trimmed along the cutting edge 4;

[0027] Step 4: Arrange the guide and establish vacuum according to the process requirements. After the infusion, curing and blade root cutting are completed, remove the detachable mold boss 3. The manufacturing process in this process is the current conventional manufacturing process, and the specific process details will not be described in detail in this patent.

[0028] Step 5: Lay the exhaust medium 6 on the mold flange 2. The exhaust medium 6 is one of the air-permeable felt and the guide net. Then, a sealing tape 7 is respectively pasted on the mold flange 2 and the exposed part of the outer side of the product layer 5. Two sealing tapes 7 are pasted one by one on both sides of the vacuum bag film 8 to establish vacuum between the product layer 5 and the mold flange 2 and compact and tighten them, so as to complete the establishment of half-sheet vacuum adsorption.

[0029] Step 6: Apply glue and stick the web according to the blade process requirements, and close the two identical half blade molds prepared in steps 1 to 5; the manufacturing process in this process is the current conventional manufacturing process, and the specific process details will not be described in detail in this patent;

[0030] Step 7: After the mold is closed, use a plastic scraper to remove and flatten the excess adhesive 10 on the outside of the mold joint 11;

[0031] Step 8: After the mold is closed and solidified according to the blade process requirements, the blade without flash is obtained after demoulding, without flash, without adhesive extrusion, and without trimming operation. The manufacturing process in this process is the current conventional manufacturing process, and the specific process details are not described in detail in this patent;

[0032] The key technology of the present invention is to prepare a blade mold with a detachable mold boss 3. When the cloth layer is laid, there is no need to flanging. When the mold is closed to establish vacuum adsorption, the detachable mold boss 3 is removed, and vacuum adsorption is established between the part of the product layer 5 exposed from the mold and the mold flange 2 to ensure that the product layer 5 is tightly attached to the mold during the mold closing process. At the same time, after the mold is closed, since the mold boss is removed, there is enough space to use a plastic scraper to collect the excess adhesive squeezed out by the mold closing, thereby eliminating the flash generated by the blade production and the extruded adhesive. After the blade is demolded, there is no flash and no trimming is required.

[0033] The flash-free blades manufactured by the method of the present invention can reduce the labor and equipment cost investment in the trimming process, improve the post-processing flow efficiency of the blades, and reduce the pollution of trimming dust to the environment.

[0034] In addition to the above embodiments, the device of the present invention may also have other forms. It should be pointed out that any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention fall within the protection scope of the present invention.

Claims

1. A method for manufacturing a flashless wind turbine blade, characterized in that: The following steps are involved: Step 1: Install the detachable mold boss on the flange boss of the mold flange; the flange boss is arranged at one end where the mold flange is connected to the blade mold, and the end surface of the mold boss close to the mold cavity is an arc surface, and the arc surface smoothly transitions with the inner arc surface of the mold cavity; Step 2: Laying the product layer on the mold cavity of the blade mold according to the blade manufacturing process; Step 3: After the layering is completed, the layering of the product that exceeds the mold cavity is trimmed along the cutting edge; Step 4: Arrange the guide medium according to the process requirements to establish vacuum, and after the infusion, curing and blade root cutting are completed, remove the detachable mold boss; Step 5: Lay the exhaust medium on the mold flange, and then stick a piece of sealing tape on the mold flange and the exposed part on the outside of the product layer, so that two pieces of sealing tape are correspondingly stuck on both sides of the vacuum bag film, and vacuum is established between the product layer and the mold flange, and the vacuum adsorption of half a piece is completed; Step 6: Apply glue, stick the web, install the parts and close the mold according to the blade process requirements; Step 7. After closing the mold, use a plastic scraper to remove and smooth the excess adhesive on the outside of the mold joint; Step 8: According to the blade process requirements, the mold is closed and solidified, and after demoulding, a flash-free blade is obtained.

2. The method for manufacturing a flashless wind turbine blade according to claim 1, characterized in that: The flange boss is detachably mounted on the blade mold.

3. The method for manufacturing a flashless wind turbine blade according to claim 1, characterized in that: The air extraction medium in step five is one of air-permeable felt or guide net.

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