Extended wind turbine rotor blade and disassembly method thereof

Abstract

The present invention discloses an extended wind turbine rotor blade. By installing a blade tip extension section at the tip of a blade cup body, the blade length is extended to increase the swept area, thereby improving the power generation of the wind turbine, improving the utilization rate of the wind turbine, and increasing the revenue of the wind farm. At the same time, because the first upper reinforcing rib and the first lower reinforcing rib are bonded and fixed to the blade body, there is no need to disassemble the blade body for installation when installing the blade tip extension section. The present invention also discloses a disassembly and assembly method for the extended wind turbine rotor blade, which has the advantages of convenient installation and convenient replacement after the blade tip extension section is damaged.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbine rotor blades, and in particular to an extended wind turbine rotor blade and a disassembly and assembly method thereof. Background Art

[0002] How to improve the efficiency of each wind turbine as much as possible is what technicians need to consider when establishing a wind farm. There are many factors that affect the efficiency of wind turbines, such as the wind resource conditions of the wind farm (such as the annual average wind speed), the configuration of the wind turbine, and the matching degree between the parameter settings of the wind turbine blades (such as the swept area) and the wind turbine, etc. However, in actual applications, although full consideration is given when establishing a wind farm, there is still a mismatch between the wind resource conditions of the wind farm and the wind turbine, which makes the efficiency of the wind turbine unable to be effectively exerted. If the wind turbine is to maintain a high efficiency, it is necessary to lengthen the wind turbine rotor blades to increase the swept area, thereby increasing the power generation of the wind turbine, improving the availability of the wind turbine, and increasing the revenue of the wind farm.

[0003] At present, the lengthening of wind turbine rotor blades is mainly achieved by replacing new blades. Replacing new blades requires redesign, production and installation, and it is difficult to remove the old blades and install the new blades, which ultimately leads to high costs for replacing new blades and difficulty in obtaining the best economic benefits. Summary of the invention

[0004] The purpose of the present invention is to provide an extended wind turbine rotor blade, which has the function of extending the blade to increase the swept area, thereby increasing the power generation of the wind turbine, improving the utilization rate of the wind turbine, and increasing the income of the wind farm.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions: an extended wind turbine rotor blade, comprising a blade body, a blade tip extension section detachably mounted on the blade tip of the blade body, the blade tip extension section comprising an upper extension shell mounted on the upper surface of the blade body, and a lower extension shell mounted on the lower surface of the blade body and having its edge in contact with the upper extension shell; a plurality of first upper reinforcing ribs and a first lower reinforcing rib distributed along its length direction are respectively bonded to the upper and lower surfaces of the blade tip of the blade body, a plurality of second upper reinforcing ribs are respectively abutted on the plurality of first upper reinforcing ribs when the blade tip extension section is installed are arranged on the inner side of the upper extension shell, a plurality of second lower reinforcing ribs are respectively abutted on the plurality of first lower reinforcing ribs when the upper blade tip extension section is installed are arranged on the inner side of the lower extension shell, a plurality of fixings are respectively arranged between the first upper reinforcing rib and the second upper reinforcing rib, and between the first lower reinforcing rib and the second lower reinforcing rib, and a glass fiber cloth that simultaneously wraps the circumference of the blade body and the blade tip extension section is bonded to the blade body and the blade tip extension section.

[0006] By adopting the above technical scheme, by installing a blade tip extension section at the blade tip of the blade cup body, the blade length is extended to increase the swept area, thereby improving the power generation of the wind turbine, improving the utilization rate of the wind turbine, and increasing the income of the wind farm; and the blade tip extension section includes an upper extension shell and a lower extension shell, the inner side of the upper extension shell is provided with a plurality of second upper reinforcing ribs that respectively abut against the plurality of first upper reinforcing ribs when the blade tip extension section is installed, and the inner side of the lower extension shell is provided with a plurality of second lower reinforcing ribs that respectively abut against the plurality of first lower reinforcing ribs when the upper blade tip extension section is installed, and a plurality of fixing parts are respectively provided between the first upper reinforcing ribs and the second upper reinforcing ribs and between the first lower reinforcing ribs and the second lower reinforcing ribs, so as to ensure the connection stability of the blade tip extension section; at the same time, the provision of the glass fiber cloth can improve the overall strength of the blade, as well as improve the connection stability of the blade body and the blade tip extension section; in addition, because the first upper reinforcing ribs and the first lower reinforcing ribs are bonded and fixed to the blade body, it is not necessary to disassemble the blade body for installation when installing the blade tip extension section.

[0007] The present invention is further configured as follows: the first upper reinforcing rib is provided with a plurality of first upper threaded holes extending along its length direction, the first lower reinforcing rib is provided with a plurality of first lower threaded holes extending along its length direction, the upper extended shell is provided with a plurality of second upper threaded holes respectively corresponding to the plurality of first upper threaded holes and penetrating the second upper reinforcing rib, the lower extended shell is provided with a plurality of second lower threaded holes respectively corresponding to the plurality of first lower threaded holes and penetrating the second lower reinforcing rib, the fixing part is a threaded column threadedly connected between the first upper threaded hole and the second upper threaded hole and threadedly connected between the first lower threaded hole and the second lower threaded hole, and the threaded column is made of non-metallic material.

[0008] By adopting the above technical solution, the fixing part includes a threaded column threadedly connected between the first upper threaded hole and the second upper threaded hole, and threadedly connected between the first lower threaded hole and the second lower threaded hole, so as to fix the tip extension section on the tip of the blade body. At the same time, when multiple threaded columns are threadedly connected, they can play a role in correcting deviation to ensure the accuracy of the installation angle of the tip extension section.

[0009] The present invention is further configured as follows: an inner hexagonal groove is provided at the end of the threaded column.

[0010] By adopting the above technical solution, the hexagonal groove on the threaded column can facilitate the screwing of the threaded column.

[0011] The present invention is further configured as follows: the opening edge of the blade tip extension section abuts against the peripheral side of the blade body, the intersection of the opening edge of the blade tip extension section and the blade body is fixed and sealed by glue, and the edge intersection of the upper extension shell and the lower extension shell is fixed and sealed by glue.

[0012] By adopting the above technical solution, the intersection of the opening edge of the blade tip extension section and the blade body is fixed and sealed by glue, and the edge intersection of the upper extension shell and the lower extension shell is fixed and sealed by glue, thereby ensuring the sealing of the blade tip extension section after installation.

[0013] The present invention is further configured as follows: the edges wrapped with the glass fiber cloth intersect with the lower surface of the blade body and the lower surface of the lower extended shell.

[0014] By adopting the above technical solution, the edge after being wrapped with the glass fiber cloth is connected with the lower surface of the blade body and the lower surface of the lower extended shell. At this time, the glass fiber cloth can completely cover the edge intersection of the upper extended shell and the lower extended shell, thereby improving the structural strength and connection stability of the blade tip extension section.

[0015] The present invention also discloses a method for disassembling and assembling a wind turbine blade of an extended wind turbine generator set, including a method for installing a blade tip extension section, wherein the method for installing the blade tip extension section comprises the following steps: A1: pre-processing a plurality of first upper threaded holes on a first upper reinforcing rib, pre-processing a plurality of first lower threaded holes on a first lower reinforcing rib, and bonding and fixing the plurality of first upper reinforcing ribs and the plurality of first lower reinforcing ribs to the upper and lower surfaces of the blade tip of the blade body; A2: bonding a plurality of second upper reinforcing ribs corresponding to the first upper reinforcing ribs respectively to the inner side of an upper extension shell of the blade tip extension section, bonding a plurality of second lower reinforcing ribs corresponding to the first lower reinforcing ribs respectively to the inner side of a lower extension shell of the blade tip extension section, and processing a plurality of second upper threaded holes corresponding to the plurality of first upper threaded holes and penetrating the second upper reinforcing ribs on the upper extension shell, and processing a plurality of second lower threaded holes corresponding to the first lower threaded holes and penetrating the second lower reinforcing ribs on the lower extension shell. A3: Splice the upper extension shell onto the blade body, and make the positions of the plurality of first upper reinforcing ribs and the plurality of second upper reinforcing ribs relative to each other, and tighten the plurality of threaded columns between the first upper threaded hole and the second upper threaded hole; Splice the lower extension shell onto the blade body, and make the positions of the plurality of first lower reinforcing ribs and the second lower reinforcing ribs relative to each other, and tighten the plurality of threaded columns between the first lower threaded hole and the second lower threaded hole; A4: Use glue to fix and seal the edge intersection of the upper extension shell and the lower extension shell, and use glue to fix and seal the opening edge of the blade tip extension section and the intersection of the blade body; A5: Apply glue to the peripheral surface of the blade body and the blade tip extension section, and bond and fix the glass fiber cloth to the peripheral side of the blade body and the blade tip extension section, and during the wrapping and bonding process, make the edge of the glass fiber cloth wrapped with the lower surface of the blade body and the lower surface of the lower extension shell.

[0016] By adopting the above technical solution, the tip extension section can be installed on the blade body, ensuring the sealing and connection stability of the tip extension section after installation, and extending the blade length to increase the swept area, thereby improving the power generation of the wind turbine, improving the utilization rate of the wind turbine, and increasing the revenue of the wind farm; at the same time, because the first upper reinforcement rib and the first lower reinforcement rib are bonded and fixed to the blade body, there is no need to disassemble the blade body for installation when installing the tip extension section.

[0017] The present invention is further configured as follows: it also includes a method for disassembling a blade tip extension section, and the method for disassembling a blade tip extension section includes the following steps: B1: cutting the glass fiber cloth at the intersection of the blade body and the edge of the blade tip extension section, and cutting the glass fiber cloth at the edge intersection of the upper extension shell and the lower extension shell; B2: grinding off the glue between the edge of the blade tip extension section and the blade body, and grinding off the glue at the edge intersection of the upper extension shell and the lower extension shell; B3: removing the glass fiber cloth at the position corresponding to the threaded column, unscrewing all the threaded columns threadedly connected between the first upper threaded hole and the second upper threaded hole, and disassembling the upper extension shell; unscrewing all the threaded columns threadedly connected between the first lower threaded hole and the second lower threaded hole, and disassembling the lower extension shell.

[0018] By adopting the above technical solution, the glass fiber cloth at the intersection of the blade body and the opening edge of the blade tip extension section is cut, the glass fiber cloth at the edge intersection of the upper extension shell and the lower extension shell is cut, the glue between the opening edge of the blade tip extension section and the blade body is grinded off, the glue at the edge intersection of the upper extension shell and the lower extension shell is grinded off, and the glass fiber cloth at the position corresponding to the threaded column is removed, so that the threaded column can be unscrewed after being exposed, thereby realizing the removal of the blade tip extension section.

[0019] The present invention is further configured as follows: in step B3, the glass fiber cloth at the position corresponding to the threaded column is directly polished by a polishing machine to expose the threaded column, and at the same time, if the glue applied on the surface of the blade tip extension penetrates into the gap between the threaded column and the second upper threaded hole, or the gap between the threaded column and the second lower threaded hole, the edge of the threaded column is polished by a polishing machine to remove the glue.

[0020] By adopting the above technical solution, when the glass fiber cloth corresponding to the position of the threaded column is directly polished by a polishing machine to expose the threaded column, the edge of the threaded column is polished incidentally, thereby removing the portion of glue that penetrates into the gap between the threaded column and the second upper threaded hole, or the gap between the threaded column and the second lower threaded hole when the glue is brushed on the surface of the blade tip extension section, so as to facilitate unscrewing the threaded column.

[0021] The present invention is further configured as follows: it also includes a method for installing a new blade tip extension section, and the method for installing the new blade tip extension section includes the following steps: repeating steps A2 to A4, applying glue to the glass fiber cloth remaining on the blade body and the peripheral surface of the blade tip extension section, and gluing and fixing the new glass fiber cloth to the blade body and the peripheral side of the blade tip extension section.

[0022] By adopting the above solution, after the blade tip extension section is damaged due to long-term use, a new blade tip extension section can be replaced for installation and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1This is a bottom view of Embodiment 1 (the blade body and the edge of the blade tip extension are indicated by dashed lines);

[0024] Figure 2 Schematic diagram of the upper surface structure after the glass fiber cloth is removed in Example 1 (the portion of the blade body in the blade tip extension section and the second upper reinforcing rib are indicated by dotted lines);

[0025] Figure 3 is a structural cross-sectional view of Example 1;

[0026] Figure 4 yes Figure 3 A partial enlarged view of point A.

[0027] Figure numerals: 1. Blade body; 11. First upper reinforcing rib; 111. First upper threaded hole; 12. First lower reinforcing rib; 121. First lower threaded hole; 2. Tip extension section; 21. Upper extension shell; 211. Second upper reinforcing rib; 22. Lower extension shell; 221. Second lower reinforcing rib; 23. Second upper threaded hole; 24. Second lower threaded hole; 3. Threaded column; 31. Hexagon socket; 4. Fiberglass cloth. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0029] Embodiment 1: An extended wind turbine rotor blade, as shown in FIG. Figure 2 As shown, it includes a blade body 1, a blade tip extension section 2 that can be detachably installed on the tip of the blade body 1, and the blade tip extension section 2 includes an upper extension shell 21 installed on the upper surface of the blade body 1, and a lower extension shell 22 installed on the lower surface of the blade body 1 and the edge of which is in contact with the upper extension shell 21.

[0030] like Figures 1 to 3 As shown, the upper and lower surfaces of the blade tip of the blade body 1 are respectively bonded with a plurality of first upper reinforcing ribs 11 and first lower reinforcing ribs 12 distributed along the length direction thereof, and the shape of the blade body 1 gradually becomes flatter and narrower toward the blade tip thereof, and the end surfaces of the plurality of first upper reinforcing ribs 11 and the plurality of first lower reinforcing ribs 12 close to the blade body 1 are all adapted to the circumferential side of the blade body 1. A plurality of second upper reinforcing ribs 211 are bonded to the inner side of the upper extension shell 21, and a plurality of second lower reinforcing ribs 221 are bonded to the inner side of the lower extension shell 22, and a plurality of second lower reinforcing ribs 221 are bonded to the inner side of the lower extension shell 22, and a plurality of first lower reinforcing ribs 12 are respectively bonded to the inner side of the lower extension shell 22, and a plurality of first lower reinforcing ribs 12 are respectively bonded to the inner side of the lower extension shell 22.

[0031] like Figure 3 and Figure 4As shown, the first upper reinforcing rib 11 is provided with a plurality of first upper threaded holes 111 extending along the length direction thereof, the first lower reinforcing rib 12 is provided with a plurality of first lower threaded holes 121 extending along the length direction thereof, the upper extension shell 21 is provided with a plurality of second upper threaded holes 23 corresponding to the plurality of first upper threaded holes 111 and penetrating the second upper reinforcing rib 211, and the lower extension shell 22 is provided with a plurality of second lower threaded holes 24 corresponding to the plurality of first lower threaded holes 121 and penetrating the second lower reinforcing rib 221. A plurality of fixing members are respectively provided between the first upper reinforcing rib 11 and the second upper reinforcing rib 211, and between the first lower reinforcing rib 12 and the second lower reinforcing rib 221. The fixing member is a threaded column 3 threadedly connected between the first upper threaded hole 111 and the second upper threaded hole 23, and threadedly connected between the first lower threaded hole 121 and the second lower threaded hole 24. The threaded column 3 is made of non-metallic material, for example, carbon fiber. An inner hexagonal groove 31 is provided at the end of the threaded column 3.

[0032] like Figure 1 , Figure 3 and Figure 4 As shown, the opening edge of the blade tip extension section 2 abuts against the circumference of the blade body 1, the opening edge of the blade tip extension section 2 and the blade body 1 are fixed and sealed by glue at the intersection, and the edge intersection of the upper extension shell 21 and the lower extension shell 22 is fixed and sealed by glue. A glass fiber cloth 4 is bonded between the blade body 1 and the blade tip extension section 2 to wrap the circumference of both the blade body 1 and the blade tip extension section 2. The edges of the glass fiber cloth 4 after wrapping intersect, and the edges of the glass fiber cloth 4 after wrapping intersect with the lower surface of the blade body 1 and the lower surface of the lower extension shell 22.

[0033] Implementation effect: By installing the blade tip extension section 2 at the blade tip of the blade cup body, the blade length is extended to increase the swept area, thereby improving the power generation of the wind turbine, improving the availability of the wind turbine, and increasing the benefits of the wind farm; and the blade tip extension section 2 includes an upper extension shell 21 and a lower extension shell 22, and the inner side of the upper extension shell 21 is provided with a plurality of second upper reinforcing ribs 211 that respectively abut against the plurality of first upper reinforcing ribs 11 when the blade tip extension section 2 is installed, and the inner side of the lower extension shell 22 is provided with a plurality of second upper reinforcing ribs 211 that respectively abut against the plurality of first lower reinforcing ribs 11 when the upper blade tip extension section 2 is installed. A plurality of fixing parts are respectively arranged on the second lower reinforcing rib 221 on the rib 12, between the first upper reinforcing rib 11 and the second upper reinforcing rib 211, and between the first lower reinforcing rib 12 and the second lower reinforcing rib 221, so as to ensure the connection stability of the tip extension section 2; at the same time, the arrangement of the glass fiber cloth 4 can improve the overall strength of the blade, as well as the connection stability of the blade body 1 and the tip extension section 2; in addition, because the first upper reinforcing rib 11 and the first lower reinforcing rib 12 are bonded and fixed to the blade body 1, there is no need to disassemble the blade body 1 for installation when installing the tip extension section 2.

[0034] Embodiment 2: A method for disassembling an extended wind turbine rotor blade, including a method for installing a blade tip extension section 2, a method for disassembling the blade tip extension section 2, and a method for installing a new blade tip extension section 2.

[0035] The installation method of the blade tip extension section 2 includes the following steps: A1: pre-processing a plurality of first upper threaded holes 111 on the first upper reinforcing rib 11, pre-processing a plurality of first lower threaded holes 121 on the first lower reinforcing rib 12, and bonding and fixing the plurality of first upper reinforcing ribs 11 and the plurality of first lower reinforcing ribs 12 to the upper and lower surfaces of the blade tip of the blade body 1; A2: bonding a plurality of second upper reinforcing ribs 211 corresponding to the first upper reinforcing ribs 11 on the inner side of the upper extension shell 21 of the blade tip extension section 2, bonding a plurality of second lower reinforcing ribs 221 corresponding to the first lower reinforcing ribs 12 on the inner side of the lower extension shell 22 of the blade tip extension section 2, and processing a plurality of second upper threaded holes 23 corresponding to the plurality of first upper threaded holes 111 and penetrating the second upper reinforcing ribs 211 on the upper extension shell 21, and processing a plurality of second lower threaded holes 24 corresponding to the first lower threaded holes 121 and penetrating the second lower reinforcing ribs 221 on the lower extension shell 22; A3: bonding the upper extension shell The body 21 is spliced ​​on the blade body 1, and the positions of the multiple first upper reinforcing ribs 11 and the multiple second upper reinforcing ribs 211 are opposite, and the multiple threaded columns 3 are tightened between the first upper threaded hole 111 and the second upper threaded hole 23; the lower extension shell 22 is spliced ​​on the blade body 1, and the positions of the multiple first lower reinforcing ribs 12 and the second lower reinforcing ribs 221 are opposite, and the multiple threaded columns 3 are tightened between the first lower threaded hole 121 and the second lower threaded hole 24; A4: The edge intersection of the upper extension shell 21 and the lower extension shell 22 is fixed and sealed by glue, and the opening edge of the blade tip extension section 2 is fixed and sealed by glue. The intersection with the blade body 1; A5: Glue is applied to the peripheral surface of the blade body 1 and the blade tip extension section 2, and the glass fiber cloth 4 is bonded and fixed to the peripheral side of the blade body 1 and the blade tip extension section 2, and during the wrapping and bonding process, the edge of the glass fiber cloth 4 after wrapping is aligned with the lower surface of the blade body 1 and the lower surface of the lower extension shell 22.

[0036] The method for disassembling the tip extension section 2 includes the following steps: B1: cutting the glass fiber cloth 4 at the intersection of the blade body 1 and the opening edge of the blade tip extension section 2, and cutting the glass fiber cloth 4 at the edge intersection of the upper extension shell 21 and the lower extension shell 22; B2: grinding off the glue between the opening edge of the tip extension section 2 and the blade body 1, and grinding off the glue at the edge intersection of the upper extension shell 21 and the lower extension shell 22; B3: removing the glass fiber cloth 4 at the position corresponding to the threaded column 3, unscrewing all the threaded columns 3 threadedly connected between the first upper threaded hole 111 and the second upper threaded hole 23, and disassembling the upper extension shell 21; unscrewing all the threaded columns 3 threadedly connected between the first lower threaded hole 121 and the second lower threaded hole 24, and disassembling the lower extension shell 22. At the same time, in step B3, the glass fiber cloth 4 corresponding to the position of the threaded column 3 is directly polished by a polishing machine to expose the threaded column 3. At the same time, if the glue applied on the surface of the blade tip extension section 2 penetrates into the gap between the threaded column 3 and the second upper threaded hole 23, or the gap between the threaded column 3 and the second lower threaded hole 24, the edge of the threaded column 3 is polished by a polishing machine to remove the glue.

[0037] The installation method of the new blade tip extension section includes the following steps: repeating steps A2 to A4, applying glue to the glass fiber cloth 4 remaining on the blade body 1 and the peripheral surface of the blade tip extension section 2, and gluing and fixing the new glass fiber cloth 4 on the peripheral surface of the blade body 1 and the blade tip extension section 2.

[0038] Implementation effect: When installing the blade tip extension 2, the blade tip extension 2 can be installed on the blade body 1, ensuring the sealing and connection stability of the blade tip extension 2 after installation, and extending the blade length to increase the swept area, thereby improving the power generation of the wind turbine, improving the availability of the wind turbine, and increasing the benefits of the wind farm; at the same time, because the first upper reinforcing rib 11 and the first lower reinforcing rib 12 are bonded and fixed to the blade body 1, it is not necessary to disassemble the blade body 1 for installation when installing the blade tip extension 2. When disassembling the blade tip extension 2, the glass fiber cloth 4 at the intersection of the opening edge of the blade body 1 and the blade tip extension 2 is cut, the glass fiber cloth 4 at the edge intersection of the upper extension shell 21 and the lower extension shell 22 is cut, the glue between the opening edge of the blade tip extension 2 and the blade body 1 is polished off, the glue at the edge intersection of the upper extension shell 21 and the lower extension shell 22 is polished off, and the glass fiber cloth 4 at the position corresponding to the threaded column 3 is removed, so that the threaded column 3 can be unscrewed after being exposed, thereby realizing the removal of the blade tip extension 2. At the same time, when the blade tip extension section 2 is damaged after long-term use, a new blade tip extension section 2 can be replaced for installation and use.

[0039] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. An extended wind turbine rotor blade, characterized in that: The blade body (1) comprises a blade body (1), a blade tip extension section (2) detachably mounted on the blade tip of the blade body (1), the blade tip extension section (2) comprising an upper extension shell (21) mounted on the upper surface of the blade body (1), and a lower extension shell (22) mounted on the lower surface of the blade body (1) and having an edge in contact with the upper extension shell (21); the upper and lower surfaces of the blade tip of the blade body (1) are respectively bonded with a plurality of first upper reinforcing ribs (11) and first lower reinforcing ribs (12) distributed along the length direction thereof, and the inner side of the upper extension shell (21) is provided with a plurality of reinforcing ribs which are respectively in contact with the plurality of reinforcing ribs when the blade tip extension section (2) is mounted. a second upper reinforcing rib (211) on each of the first upper reinforcing ribs (11); a plurality of second lower reinforcing ribs (221) are arranged on the inner side of the lower extension shell (22) and respectively contact the plurality of first lower reinforcing ribs (12) when the upper blade tip extension section (2) is installed; a plurality of fixing members are respectively arranged between the first upper reinforcing rib (11) and the second upper reinforcing rib (211) and between the first lower reinforcing rib (12) and the second lower reinforcing rib (221); and a glass fiber cloth (4) is bonded between the blade body (1) and the blade tip extension section (2) to simultaneously wrap the circumference of the blade body (1) and the blade tip extension section (2); The first upper reinforcing rib (11) is provided with a plurality of first upper threaded holes (111) extending along its length direction, the first lower reinforcing rib (12) is provided with a plurality of first lower threaded holes (121) extending along its length direction, the upper extension shell (21) is provided with a plurality of second upper threaded holes (23) respectively corresponding to the plurality of first upper threaded holes (111) and penetrating the second upper reinforcing rib (211), the lower extension shell (22) is provided with a plurality of second lower threaded holes (24) respectively corresponding to the plurality of first lower threaded holes (121) and penetrating the second lower reinforcing rib (221), the fixing member is a threaded column (3) threadedly connected between the first upper threaded hole (111) and the second upper threaded hole (23) and threadedly connected between the first lower threaded hole (121) and the second lower threaded hole (24), and the threaded column (3) is made of a non-metallic material; The edges of the glass fiber cloth (4) after being wrapped intersect, and the edges of the glass fiber cloth (4) after being wrapped intersect with the lower surface of the blade body (1) and the lower surface of the lower extended shell (22).

2. The extended wind turbine rotor blade according to claim 1, characterized in that: The end of the threaded column (3) is provided with a hexagonal socket (31).

3. The extended wind turbine rotor blade according to claim 2, characterized in that: The opening edge of the blade tip extension section (2) contacts the circumferential side of the blade body (1); the intersection of the opening edge of the blade tip extension section (2) and the blade body (1) is fixed and sealed by glue; and the intersection of the edges of the upper extension shell (21) and the lower extension shell (22) is fixed and sealed by glue.

4. A method for disassembling and assembling an extended wind turbine rotor blade according to claim 3, characterized in that: The invention comprises a method for installing a blade tip extension section (2), wherein the method for installing the blade tip extension section (2) comprises the following steps: A1: Pre-processing a plurality of first upper threaded holes (111) on the first upper reinforcing rib (11), pre-processing a plurality of first lower threaded holes (121) on the first lower reinforcing rib (12), and gluing and fixing the plurality of first upper reinforcing ribs (11) and the plurality of first lower reinforcing ribs (12) to the upper and lower surfaces of the blade tip of the blade body (1); A2: a plurality of second upper reinforcing ribs (211) respectively corresponding to the first upper reinforcing ribs (11) are bonded to the inner side of the upper extension shell (21) of the blade tip extension section (2), a plurality of second lower reinforcing ribs (221) respectively corresponding to the first lower reinforcing ribs (12) are bonded to the inner side of the lower extension shell (22) of the blade tip extension section (2), and a plurality of second upper threaded holes (23) corresponding to the plurality of first upper threaded holes (111) and penetrating the second upper reinforcing ribs (211) are processed on the upper extension shell (21), and a plurality of second lower threaded holes (24) corresponding to the first lower threaded holes (121) and penetrating the second lower reinforcing ribs (221) are processed on the lower extension shell (22); A3: splicing the upper extension shell (21) onto the blade body (1) so that the positions of the plurality of first upper reinforcing ribs (11) and the plurality of second upper reinforcing ribs (211) are opposite to each other, and tightening the plurality of threaded columns (3) between the first upper threaded hole (111) and the second upper threaded hole (23); splicing the lower extension shell (22) onto the blade body (1) so that the positions of the plurality of first lower reinforcing ribs (12) and the second lower reinforcing ribs (221) are opposite to each other, and tightening the plurality of threaded columns (3) between the first lower threaded hole (121) and the second lower threaded hole (24); A4: The edge junction of the upper extension shell (21) and the lower extension shell (22) is fixed and sealed by glue, and the opening edge of the blade tip extension section (2) and the junction of the blade body (1) are fixed and sealed by glue; A5: Glue is applied to the circumferential surfaces of the blade body (1) and the blade tip extension section (2), and the glass fiber cloth (4) is bonded and fixed to the circumferential surfaces of the blade body (1) and the blade tip extension section (2), and during the wrapping and bonding process, the edges of the glass fiber cloth (4) after wrapping are aligned with the lower surface of the blade body (1) and the lower surface of the lower extension shell (22).

5. The method for disassembling and assembling the extended wind turbine rotor blade according to claim 4, characterized in that: Also included is a method for disassembling the blade tip extension section (2), the method for disassembling the blade tip extension section (2) comprising the following steps: B1: cutting the glass fiber cloth (4) at the intersection of the blade body (1) and the opening edge of the blade tip extension section (2), and cutting the glass fiber cloth (4) at the intersection of the edge of the upper extension shell (21) and the lower extension shell (22); B2: Grind off the glue between the opening edge of the blade tip extension section (2) and the blade body (1), and grind off the glue at the junction of the edges of the upper extension shell (21) and the lower extension shell (22); B3: Remove the glass fiber cloth (4) at the position corresponding to the threaded column (3), unscrew all the threaded columns (3) threadedly connected between the first upper threaded hole (111) and the second upper threaded hole (23), and remove the upper extension shell (21); unscrew all the threaded columns (3) threadedly connected between the first lower threaded hole (121) and the second lower threaded hole (24), and remove the lower extension shell (22).

6. The method for disassembling and assembling the extended wind turbine rotor blade according to claim 5, characterized in that: In step B3, the glass fiber cloth (4) at the position corresponding to the threaded column (3) is directly polished by a polishing machine to expose the threaded column (3). At the same time, if the glue applied on the surface of the blade tip extension section (2) penetrates into the gap between the threaded column (3) and the second upper threaded hole (23), or the gap between the threaded column (3) and the second lower threaded hole (24), the edge of the threaded column (3) is polished by a polishing machine to remove the glue.

7. The method for disassembling and assembling the extended wind turbine rotor blade according to claim 6, characterized in that: The invention also includes a method for installing a new blade tip extension section (2), wherein the method for installing the new blade tip extension section (2) comprises the following steps: repeating steps A2 to A4, applying glue to the glass fiber cloth (4) remaining on the blade body (1) and the peripheral surface of the blade tip extension section (2), and gluing and fixing the new glass fiber cloth (4) to the peripheral surface of the blade body (1) and the blade tip extension section (2).

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