A wind turbine blade extension assembly connection structure and process

Abstract

The present invention relates to the technical field of blade tip connection structures of wind turbines, and relates to a connection process for blade extension components of wind turbines. On the basis of the original blade, the blade extension attachment is connected to increase the blade length, increase the swept area of ​​the wind wheel, and capture more wind energy; the blade reinforcement attachment is connected to increase the structural strength of the original blade near the blade tip, increase the load bearing capacity, and ensure the safe operation of the blade. Reserve the expansion joint distance to ensure that the adhesive area between the original blade and the blade extension attachment and the blade reinforcement attachment is not connected; arrange the bonding ribs to ensure that the adhesive between the original blade and the blade reinforcement attachment is wavy in shape, limit the scope of adhesive crack expansion, and thus achieve the safety of the blade extension component connection structure. By reasonably arranging the installation process and increasing parallel nodes, the construction time and cost of high-altitude operations on site can be saved; ensure that the bonding of important blade extension components has sufficient adhesive curing time to improve the construction quality.

Description

Technical Field

[0001] The invention relates to the technical field of blade tip connection structures of wind generator sets, and in particular to a connection structure and process for a blade extension assembly of a wind generator set. Background Art

[0002] With the large-scale development of the wind power industry, the application technology level of wind farms and wind turbines is increasing day by day. In order to ensure the long-term, continuous and efficient operation of wind power projects, the technical transformation of wind farms to improve quality and efficiency is constantly advancing. Among them, from the perspective of hardware quality and efficiency, blade extension has become one of the main methods. Considering the construction period and cost, blade tip extension would be the best choice.

[0003] Blade extension is achieved by increasing the swept area of ​​the wind rotor, capturing more wind energy, and achieving more efficient energy conversion efficiency. Therefore, while the power is increased, the blade load will also increase accordingly. After the tip of the blade is extended, the corresponding load in the area near the tip of the original blade will usually increase significantly, which may cause the original blade structure to fail. Therefore, when installing the blade extension accessories, the original blade structure also needs to be reinforced, especially the area near the tip of the original blade that shows failure.

[0004] There are two corresponding processing methods:

[0005] The first method is to integrate the blade extension accessories and the original blade reinforcement into one piece. The advantage is that the corresponding accessories only need to be prepared once, and the workshop environment and equipment can more easily ensure the production quality. However, the weight and length of the accessories are significantly increased, which will increase the difficulty of transportation and construction as well as the safety risks of the whole process.

[0006] The second method: separate the blade extension accessories from the original blade reinforcement. The blade extension accessories are prepared in the workshop, while the original blade reinforcement is constructed on site. As part of the final blade main load-bearing structure, the construction quality of the original blade reinforcement structure will be affected by the fluctuation of on-site environmental equipment parameters, which will pose a hidden danger to subsequent operational safety and regular maintenance. At the same time, due to the scope limitations of high-altitude operations, large-scale reinforcements are often unable to be completed at one time, and technicians must construct in sections, which increases the on-site construction procedures and the curing and post-curing time requirements, causing the high-altitude operation construction period to be extended exponentially, which also means more process costs and safety risks.

[0007] Based on the above analysis, there is a need to prepare the blade extension accessories and the original blade reinforcement separately in the workshop and then install them on site, which involves the connection of the blade extension multi-accessory combination (i.e., blade extension assembly).

[0008] During the on-site installation process, the blade extension assembly needs to be bonded to the corresponding position of the original blade by adhesive so that the accessories can achieve the designed relative position relationship. How to ensure the safety of adhesive bonding, avoid the expansion and transmission of adhesive cracks caused by process defects and operational damage between adjacent accessories, and prevent the bonding structure from being damaged and failing successively; how to consider the impact of the incoordination of deformation of different accessories under load and temperature conditions, and avoid mutual squeezing to accelerate the failure of adhesives; how to reasonably coordinate process steps, increase parallel nodes, and shorten the construction period of high-altitude operations are all issues that must be considered in process design. Summary of the invention

[0009] The purpose of the present invention is to provide a wind turbine blade extension assembly connection structure and process, which solves the problems of easy failure of adhesive bonding structures and long construction period in the prior art.

[0010] The present invention is achieved through the following technical solutions:

[0011] A wind turbine blade extension assembly connection process comprises the following steps:

[0012] Step 1: prefabricate blade extension accessories and blade reinforcement accessories, and the blade extension accessories and blade reinforcement accessories have bonding areas and reinforcement areas;

[0013] Step 2: preparing bonding ribs on the surface of the original blade bonding area bonded to the blade reinforcement attachment; preparing bonding ribs on the surface of the blade reinforcement attachment bonding area; and the bonding ribs of the original blade bonding area and the bonding ribs of the blade reinforcement attachment bonding area are arranged alternately;

[0014] Step 3: Apply adhesive to the corresponding bonding surface of the original blade to bond the blade extension attachment;

[0015] Step 4: heating and curing the area where the bonding ribs are arranged on the original blade and the area where the bonding ribs are arranged on the blade reinforcement attachment;

[0016] Pre-curing the bonding area between the original blade and the blade extension attachment by heating;

[0017] Step 5: Apply adhesive to the bonding ribs on the surface of the bonding area corresponding to the original blade and the blade reinforcement attachment, bond the blade reinforcement attachment, and reserve a distance for the expansion joint at the adjacent edges of the blade extension attachment and the blade reinforcement attachment;

[0018] Step 6: Pre-curing the bonding area between the original blade and the blade reinforcement attachment by heating; pre-curing the bonding area between the original blade and the blade extension attachment by heating for a second time;

[0019] Step 7: Perform bonding circumferential reinforcement on the exposed edges of the adhesive in the bonding area between the original blade and the blade extension attachment, and between the original blade and the blade reinforcement attachment;

[0020] Step 8: Curing after heating the bonding area between the original blade and the blade extension attachment, and the original blade and the blade reinforcement attachment;

[0021] The bonding annular reinforcement area between the original blade and the blade extension attachment, and between the original blade and the blade reinforcement attachment is heated and cured.

[0022] Furthermore, in step one, during prefabrication, the release cloth of the bonding area and the reinforcement area of ​​the blade extension attachment and the blade reinforcement attachment is retained; and the spanwise staggered layer is prefabricated at the adjacent edges of the blade extension attachment and the blade reinforcement attachment.

[0023] Furthermore, in step 2, bonding ribs are prepared on the surfaces of the corresponding bonding areas between the original blade and the blade reinforcement attachment using vacuum bagging prepreg or suction injection method.

[0024] Furthermore, step three is specifically as follows: connecting the tip lightning rod of the blade extension accessory with the lightning conduction path of the original blade; tearing off the demoulding cloth in the bonding area of ​​the blade extension accessory, and bonding the blade extension accessory according to the relative position relationship between the original blade and the blade extension accessory; scraping off excess adhesive at the opening position of the blade extension accessory.

[0025] Furthermore, in step five, the adhesive coating thickness is greater than the allowable value of the adhesive bonding thickness.

[0026] Furthermore, in step five, adhesive is collected at the blade reinforcement attachment near the leading edge and the trailing edge of the blade, and excess adhesive is scraped off.

[0027] Further, after step eight, a post-processing process is performed on the outer surface of all operating areas of the blade extension assembly;

[0028] The specific post-processing steps are: scraping putty, grinding and shaping, and applying paint or gel coat.

[0029] A wind turbine blade extension assembly connection structure, obtained based on the wind turbine blade extension assembly connection process, comprising an original blade, a blade extension attachment and a blade reinforcement attachment;

[0030] The original blades and blade extension accessories and blade reinforcement accessories are all bonded with adhesives;

[0031] In the bonding area between the original blade and the blade reinforcement attachment, bonding ribs are prepared on the surfaces of the bonding areas of the two by using vacuum bag film prepreg or suction injection;

[0032] The bonding ribs in the bonding area of ​​the original blade and the bonding ribs in the bonding area of ​​the blade reinforcement attachment are arranged alternately, forming a wave-shaped shape of the adhesive between the original blade and the blade reinforcement attachment;

[0033] An expansion joint distance is reserved at the adjacent edges of the blade extension attachment and the blade reinforcement attachment.

[0034] Furthermore, the exposed edges of the adhesive between the original blade and the blade extension attachment, and between the original blade and the blade reinforcement attachment are reinforced in annular direction by bonding.

[0035] Furthermore, the length direction of the bonding ribs is arranged along the chord direction of the blade;

[0036] The spacing of the bonding ribs is evenly distributed in the blade span direction. The spacing of adjacent bonding ribs on one side between the original blade and the blade reinforcement attachment in the blade span direction is d, and the spacing of adjacent bonding ribs on the opposite side in the blade span direction is d / 2.

[0037] Compared with the prior art, the present invention has the following beneficial technical effects:

[0038] The present invention discloses a connection process for blade extension components of a wind turbine generator set, which utilizes the connection characteristics of blade extension components of a wind turbine generator set, considers the design method and process requirements of the connection method, effectively reduces the connection process difficulty between the original blade and the blade extension attachment and the blade reinforcement attachment, optimizes the implementation steps, and improves the safety and reliability of the connection quality of the blade extension assembly. It has the following characteristics:

[0039] Effectively realize the connection function of blade extension components. By maintaining the distance of expansion joints, the bonding areas between blade extension components are effectively separated, reducing the difficulty of on-site construction and ensuring bonding safety;

[0040] The bonding ribs on the outer surface of the original blade and the bonding ribs on the inner surface of the blade reinforcement attachment are arranged alternately, and adhesive is applied at the bonding rib position to achieve a wavy shape of the adhesive of the blade reinforcement attachment. Through the arrangement of the bonding ribs, the bonding area is effectively segmented, limiting the scope of adhesive crack expansion and ensuring bonding safety;

[0041] The process preparation of the wave-shaped adhesive is effectively realized. The layout direction of the bonding ribs is perpendicular to the direction of the centrifugal force, which is conducive to preventing the bonding accessories from falling off. The requirements for piling, squeezing and collecting glue are clear, which effectively prevents the occurrence of uneven adhesive smearing and voids, and improves the quality of the bonding construction process.

[0042] By designing the bonding ring to hand-layup reinforcement, a smooth transition of the cross-sectional mechanical properties in the area where each blade extension component is located is achieved, and the exposed edges of the adhesive are covered to prevent aging, peeling and other problems caused by exposure.

[0043] By reasonably arranging the installation process, the pre-curing and post-curing processes of the separate bonding parts are arranged into parallel nodes, and unified heating saves the construction time and cost of on-site high-altitude operations and reduces the risk of high-altitude operations; to ensure the bonding of important blade extension components, the three curing processes of pre-curing, secondary pre-curing and post-curing can be achieved, ensuring sufficient adhesive curing time, standardizing construction technical requirements, and improving construction quality. It has obvious advantages in promoting on-site blade extension technology transformation.

[0044] Furthermore, by designing the adjacent edges of each blade extension component to be staggered and the structure near the reserved expansion joint to be weak, the nearby adhesive will not be crushed due to temperature changes and load-bearing deformation. This can reduce the problem of inharmonious deformation between different accessories at related positions, thereby avoiding the problem of adhesive failure caused by mutual squeezing. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 is a cross-sectional view of the blade extension assembly connection device;

[0046] Figure 2 This is a detailed diagram of the bonding of blade reinforcement accessories.

[0047] In the figure, 1-original blade, 2-blade extension attachment, 3-blade reinforcement attachment, 4-bonded ribs, 5-bonded circumferential reinforcement. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the present invention more clear, the following is further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the embodiments described are only part of the embodiments of the present invention, not all embodiments.

[0049] The components described and shown in the drawings and embodiments of the present invention may be arranged and designed in various configurations. Therefore, the detailed description of the embodiments of the present invention provided in the following drawings is not intended to limit the scope of the claimed invention, but merely represents a selected embodiment of the present invention. Based on the drawings and embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0050] It should be noted that the terms "comprises", "includes" or any other variants are intended to cover non-exclusive inclusion, so that a process, element, method, article or device that includes a series of elements includes not only those elements, but also includes other elements that are not explicitly listed, or also includes elements inherent to the process, element, method, article or device. In addition, the terms "horizontal" and "vertical" are based on the orientation and positional relationship of the devices or components shown in the drawings, and are only for the purpose of better describing the present invention, rather than requiring the devices, components or equipment shown to have this specific orientation, and therefore cannot be understood as limiting the present invention.

[0051] The features and performances of the present invention are further described in detail below in conjunction with the embodiments.

[0052] like Figure 1-Figure 2 As shown, the present invention discloses a wind turbine blade extension assembly connection structure, comprising an original blade 1, a blade extension attachment 2, a blade reinforcement attachment 3 and a bonding rib 4;

[0053] In the original blade reinforcement area, the inner surface of the blade reinforcement attachment 3 and the bonding rib 4, and the outer surface of the original blade 1 and the bonding rib 4 are connected by vacuum bag film prepreg or suction injection;

[0054] The original blade 1 and the blade extension attachment 2, as well as the original blade 1 and the blade reinforcement attachment 3, are all connected by adhesive bonding.

[0055] like Figure 2 As shown, in the original blade reinforcement area, the length direction of the bonding ribs 4 is arranged along the blade chord direction; the spacing of the bonding ribs 4 is evenly distributed in the blade span direction, the blade span direction spacing of the adjacent bonding ribs 4 on one side of the adhesive between the original blade 1 and the blade reinforcement attachment 3 is d, and the blade span direction spacing of the adjacent bonding ribs 4 on the opposite side of the adhesive is d / 2; the thickness h of the bonding ribs 4 is less than the allowable value requirement of the adhesive bonding thickness.

[0056] The adjacent edges of the blade extension attachment 2 and the blade reinforcement attachment 3 maintain the distance of the expansion joint, and are designed with staggered layers in the span direction to form an inverted trapezoidal groove to protect the adhesive near the expansion joint.

[0057] The exposed edges of the adhesive between the original blade 1 and the blade extension attachment 2, and between the original blade 1 and the blade reinforcement attachment 3 are bonded and circumferentially reinforced 5.

[0058] The structural forms and functions of the various parts of the wind turbine blade extension assembly connection device according to the present invention are described as follows:

[0059] The original blade 1 has a structural form in which the remaining part of the blade tip structure is cut off according to the design requirements. It is a carrier for connecting the blade extension assembly and its function is to bear the load transferred by the blade extension assembly.

[0060] The blade extension attachment 2 has a new blade tip structure and is one of the blade extension components. The original blade 1 and the blade extension attachment 2 are connected by adhesive bonding. The function is to extend the blade length and increase the swept area of ​​the wind wheel.

[0061] The blade reinforcement accessory 3 is a conformal shell structure on the windward or leeward side near the blade tip. It is one of the blade extension components. The original blade 1 and the blade reinforcement accessory 3 are connected by adhesive bonding. Its function is to reinforce the structural safety of the original blade 1 near the blade tip.

[0062] The bonding ribs 4 are in the form of strip-shaped fiber fabrics and are arranged on the inner surface of the blade reinforcement attachment 3 and the outer surface of the original blade 1 within the original blade reinforcement area, and are distributed on both sides of the adhesive between the original blade 1 and the blade reinforcement attachment 3. Their function is to ensure that the adhesive between the original blade 1 and the blade reinforcement attachment 3 is wavy in shape, limit the range of adhesive crack expansion, and ensure bonding safety.

[0063] The present invention also discloses a wind turbine blade extension assembly connection process method, comprising the following steps:

[0064] The first step is to manufacture or purchase the relevant parts of the blade extension assembly connection device, including the original blade 1, the blade extension attachment 2, the blade reinforcement attachment 3, the bonding rib 4 and its bonding circumferential reinforcement, and retain the release cloth of the bonding area and reinforcement area of ​​the blade extension attachment 2 and the blade reinforcement attachment 3;

[0065] The second step is to cut the tip lightning receptor of the original blade 1, and grind the surface of the bonding area and the reinforcement area of ​​the original blade 1 to expose the outer skin glass fiber layer;

[0066] Step 3: In the reinforcement area of ​​the original blade, the outer surface of the original blade 1 is connected to the bonding rib 4 by using vacuum bagging prepreg or suction injection technology, and the exposed surface is pasted with release cloth; the release cloth in the bonding area of ​​the blade reinforcement attachment 3 is torn off, and the inner surface of the blade reinforcement attachment 3 is connected to the bonding rib 4 by using vacuum bagging prepreg or suction injection technology, and the exposed surface is pasted with release cloth;

[0067] If cracks are caused by adhesive defects, the cracks can only expand within the range circled by adjacent bonding ribs and will stop at the rib position without forming cracks that penetrate the blade spanwise.

[0068] Step 4: Connect the tip lightning receptor of blade extension attachment 2 to the lightning induction path of original blade 1; tear off the demoulding cloth in the bonding area of ​​blade extension attachment 2, and bond blade extension attachment 2 according to the relative position relationship between original blade 1 and blade extension attachment 2; scrape off excess adhesive at the opening of blade extension attachment 2;

[0069] Step 5: Pre-curing the outer surface of the original blade 1 and the bonding rib 4, the inner surface of the blade reinforcement attachment 3 and the bonding rib 4, and the relevant operation areas of the original blade 1 and the blade extension attachment 2 by heating;

[0070] Step 6. Tear off the demoulding cloth in the bonding area between the original blade 1 and the blade reinforcement attachment 3, apply adhesive on the bonding rib 4 on the surface of the bonding area, the adhesive coating thickness is greater than the allowable value of the adhesive bonding thickness, according to the relative position relationship of the original blade 1 and the blade reinforcement attachment 3, consider that the blade extension attachment 2 and the blade reinforcement attachment 3 adjacent edges maintain the expansion joint distance, and bond the blade reinforcement attachment 3; scrape off the excess adhesive at the position of the blade reinforcement attachment 3 close to the front and rear edges of the blade;

[0071] Step 7: Pre-curing the relevant operation areas of the original blade 1 and the blade reinforcement attachment 3 by heating;

[0072] Step 8. Tear off the demoulding cloth of the reinforcement area of ​​the original blade 1, the blade extension attachment 2 and the blade reinforcement attachment 3, and perform hand lay-up reinforcement on the exposed edges of the adhesive between the original blade 1 and the blade extension attachment 2, and between the original blade 1 and the blade reinforcement attachment 3;

[0073] Step 9: Heat and cure the bonding area between the original blade 1 and the blade extension attachment 2, and between the original blade 1 and the blade reinforcement attachment 3; heat and cure the bonding circumferential reinforcement area between the original blade 1 and the blade extension attachment 2, and between the original blade 1 and the blade reinforcement attachment 3;

[0074] Step 10: Apply putty, polish and shape the outer surface of all operating areas of the blade extension assembly, and apply paint or gel coat.

[0075] The construction period of a traditional blade extension, without reinforcement, is 2 days; if reinforcement is included, the construction period increases by 1 day for every 1m of reinforcement, and so on. For example, if the blade is extended + reinforced by 5m, the construction period will be 2+1*5=7 days.

[0076] If the designed new process method is used, the single-piece construction can be completed within 2-3 days.

[0077] A fan has three blades, which can save 7*3-2.5*3=13.5 days.

[0078] The main thing is that the time for high-altitude curing must be guaranteed. If it is necessary to complete one section after another due to construction scope limitations, the construction period will be very long. Therefore, the present invention mainly arranges the curing time as optimally as possible, thereby saving overall time and cost.

[0079] On the basis of the original blade, the blade extension accessories are connected to increase the blade length, increase the wind wheel swept area, and capture more wind energy; by connecting the blade reinforcement accessories, the structural strength of the original blade near the tip is improved, the load-bearing capacity is increased, and the safe operation of the blade is ensured.

[0080] Reserve the expansion joint distance to ensure that the adhesive area between the original blade and the blade extension attachment and the blade reinforcement attachment is not connected; arrange the bonding ribs to ensure that the adhesive shape between the original blade and the blade reinforcement attachment is wavy, limiting the scope of adhesive crack expansion. Thus, the safety of the blade extension component connection structure is guaranteed.

[0081] The connection structure corresponding to the connection process method of the blade extension assembly of the wind turbine generator set involved in the present invention has the characteristics of clear load transfer path and simple structural design. It can effectively solve the connection problems caused by the large number of blade extension assemblies, large structural bonding area, and mutual influence of adhesive safety. In addition, the bonding area is segmented through process design to limit the scope of adhesive crack expansion and ensure bonding safety.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A process for connecting a blade extension assembly of a wind turbine generator set, characterized in that: The following steps are involved: Step 1: prefabricate the blade extension attachment (2) and the blade reinforcement attachment (3), wherein both the blade extension attachment (2) and the blade reinforcement attachment (3) have a bonding area and a reinforcement area; Step 2: preparing bonding ribs (4) on the surface of the bonding area of ​​the original blade (1) to be bonded to the blade reinforcement attachment (3); Preparing bonding ribs (4) on the surface of the bonding area of ​​the blade reinforcement attachment (3); and The bonding ribs (4) in the bonding area of ​​the original blade (1) and the bonding ribs (4) in the bonding area of ​​the blade reinforcement attachment (3) are arranged alternately; Step 3: Apply adhesive to the corresponding bonding surface of the original blade (1) to bond the blade extension attachment (2); Step 4: heating and curing the area on the original blade (1) where the bonding ribs (4) are arranged and the area on the blade reinforcement attachment (3) where the bonding ribs (4) are arranged; Pre-curing the bonding area between the original blade (1) and the blade extension attachment (2) by heating; Step 5: Apply adhesive to the bonding ribs (4) on the surface of the bonding area corresponding to the original blade (1) and the blade reinforcement attachment (3), bond the blade reinforcement attachment (3), and reserve a distance for the expansion joint at the adjacent edges of the blade extension attachment (2) and the blade reinforcement attachment (3); Step 6: Pre-curing the bonding area between the original blade (1) and the blade reinforcement attachment (3) by heating; Performing secondary heating pre-curing on the bonding area between the original blade (1) and the blade extension attachment (2); Step 7: Perform bonding circumferential reinforcement on the exposed edges of the adhesive in the bonding area between the original blade (1) and the blade extension attachment (2), and between the original blade (1) and the blade reinforcement attachment (3); Step 8: Curing the bonding areas between the original blade (1) and the blade extension attachment (2) and between the original blade (1) and the blade reinforcement attachment (3) by heating; The bonding annular reinforcement area between the original blade (1) and the blade extension attachment (2), and the original blade (1) and the blade reinforcement attachment (3) is heated and cured.

2. A wind turbine blade extension assembly connection process according to claim 1, characterized in that: In step one, during prefabrication, the release cloth of the bonding area and the reinforcement area of ​​the blade extension attachment (2) and the blade reinforcement attachment (3) is retained; and the spanwise staggered layer is prefabricated at the adjacent edges of the blade extension attachment (2) and the blade reinforcement attachment (3).

3. A wind turbine blade extension assembly connection process according to claim 1, characterized in that: In step 2, a vacuum bagging prepreg or suction injection method is used to prepare bonding ribs (4) on the surface of the corresponding bonding area between the original blade (1) and the blade reinforcement attachment (3).

4. A wind turbine blade extension assembly connection process according to claim 1, characterized in that: Step three specifically includes: connecting the blade tip lightning rod of the blade extension attachment (2) with the lightning conduction path of the original blade (1); tearing off the demoulding cloth in the bonding area of ​​the blade extension attachment (2), and bonding the blade extension attachment (2) according to the relative position relationship between the original blade (1) and the blade extension attachment (2); scraping off the excess adhesive at the opening position of the blade extension attachment (2).

5. A wind turbine blade extension assembly connection process according to claim 1, characterized in that: In step 5, the adhesive coating thickness is greater than the allowable value of the adhesive bonding thickness.

6. A wind turbine blade extension assembly connection process according to claim 1, characterized in that: In step five, glue is collected at the blade reinforcement attachment (3) near the leading edge and the trailing edge of the blade, and excess adhesive is scraped off.

7. A wind turbine blade extension assembly connection process according to claim 1, characterized in that: After step eight, the outer surface of all operating areas of the blade extension assembly is subjected to a post-processing process; The specific post-processing steps are: scraping putty, grinding and shaping, and applying paint or gel coat.

8. A wind turbine blade extension assembly connection structure, characterized in that: Obtained based on the wind turbine blade extension assembly connection process according to any one of claims 1 to 7, comprising an original blade (1), a blade extension accessory (2) and a blade reinforcement accessory (3); The original blade (1), the blade extension attachment (2), and the blade reinforcement attachment (3) are all bonded by adhesive; In the bonding area between the original blade (1) and the blade reinforcement attachment (3), bonding ribs (4) are prepared on the surfaces of the bonding areas of the two by using vacuum bag film prepreg or suction injection; The bonding ribs (4) in the bonding area of ​​the original blade (1) and the bonding ribs (4) in the bonding area of ​​the blade reinforcement attachment (3) are arranged in a staggered manner, forming a wave-shaped shape of the adhesive between the original blade (1) and the blade reinforcement attachment (3); An expansion joint distance is reserved between the adjacent edges of the blade extension attachment (2) and the blade reinforcement attachment (3).

9. A wind turbine blade extension assembly connection structure according to claim 8, characterized in that: The exposed edges of the adhesive between the original blade (1) and the blade extension attachment (2), and between the original blade (1) and the blade reinforcement attachment (3) are bonded with annular reinforcement (5).

10. A wind turbine blade extension assembly connection structure according to claim 8, characterized in that: The length direction of the bonding ribs (4) is arranged along the chord direction of the blade; The spacing of the bonding ribs (4) is evenly distributed in the blade span direction. The spacing of adjacent bonding ribs (4) on one side between the original blade (1) and the blade reinforcement attachment (3) in the blade span direction is d, and the spacing of adjacent bonding ribs (4) on the opposite side in the blade span direction is d / 2.

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