A method for recycling retired fan blades

Abstract

The present invention relates to the technical field of wind turbine blade recycling, and proposes a method for recycling retired wind turbine blades, comprising the following steps: S1, supporting and fixing the wind turbine blades; S2, cutting the wind turbine blades along a dividing line; S3, dividing the first sub-body and the second sub-body into a plurality of flattened segments; S4, placing the flattened segments into a crusher one by one and crushing them into blade debris; S5, vibrating the blade debris and recovering the glass fiber in the blade debris. The present invention sets a first dividing line, a second dividing line and a third dividing line, and allows the first dividing line and the second dividing line to be relatively arranged on both sides of the web, allows the third dividing line to cross the web, and allows at least one third dividing line to be arranged in each flattened segment. This can not only avoid the appearance of a closed cavity when the wind turbine blades are cut into segments, thereby ensuring the safety of the wind turbine blade recycling process, but also reduce the width of the flattened segment, so that it can be adapted to segment cutting devices of different specifications.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbine blade recycling, and in particular to a method for recycling retired wind turbine blades. Background Art

[0002] As the scale of the wind power industry continues to increase, my country's wind turbine blades will usher in a large-scale retirement wave. Since the main materials of the wind turbine blade shell are glass fiber and reinforced resin, in order to make effective use of resources, retired wind turbine blades are usually recycled and the glass fiber inside is separated and extracted.

[0003] The invention patent with patent publication number CN115446083B discloses a retired wind turbine blade recycling device and method based on waste reduction. The curved wind turbine blades are rolled and flattened by the downward pressure of the rolling plate on the downward pressure drive unit and the semi-open pressure plate on the other side. The scraper roller rotating on one side of the rolling plate will further move and squeeze the composite material layer of the wind turbine blade to disperse during the rotating extrusion and the movement of the connecting plate along the convex rail. The scraper on one side of the scraper roller will further separate the composite material under the moving extrusion, thereby reducing the pollution generated by the subsequent combustion of the composite material layer and reducing the overall volume of the wind turbine blade to achieve waste reduction.

[0004] In the above technical scheme, in order to facilitate the recycling processing of fan blades, a shortening unit and a cutting unit are set up. The fan blades are first shortened and then the middle part of the fan blades is cut. However, since the fan blades are hollow structures, when the fan blades are shortened, their end faces are easily squeezed and closed, so that the shortened fan blades form a hollow structure with closed ends. During subsequent cutting or crushing operations, the fan blades with closed ends will explode due to pressure, which not only poses certain safety hazards, but also is not conducive to the rapid recovery of the fan blades. Summary of the invention

[0005] In view of this, the present invention proposes a method for recycling retired fan blades, which can avoid the formation of closed cavities when the fan blades are cut into sections, thereby ensuring the safe operation of the fan blade recycling process.

[0006] The technical solution of the present invention is implemented as follows: The present invention provides a method for recycling retired wind turbine blades, comprising the following steps:

[0007] S1, supporting and fixing a fan blade, wherein the fan blade comprises an outer shell and at least one web, and the web is fixedly disposed in the outer shell;

[0008] S2, cutting the fan blade along a dividing line to divide it into a first part and a second part, the length of the first part and the length of the second part are both equal to the length of the fan blade, wherein the dividing line includes a plurality of first dividing lines, a plurality of second dividing lines and a plurality of third dividing lines, the plurality of first dividing lines and the plurality of second dividing lines are arranged at intervals along the length direction of the fan blade, and the two are arranged oppositely on both sides of the web; the third dividing line spans the web, and its two ends are respectively connected to one of the first dividing lines and one of the second dividing lines;

[0009] S3, cutting the first sub-body and the second sub-body along the width direction of the fan blade to divide the two into a plurality of flattened segments, wherein at least one third dividing line is provided in each of the flattened segments;

[0010] S4, placing the flattened segments into a crusher one by one and crushing them into blade fragments;

[0011] S5, performing a vibration treatment on the blade debris, and then recovering the glass fibers in the blade debris by using a pyrolysis or chemical solvent decomposition method.

[0012] On the basis of the above technical solution, preferably, the direction of the first cutting line and the direction of the second cutting line are both parallel to the length direction of the fan blade, and the direction of the third cutting line is inclined to the length direction of the fan blade.

[0013] More preferably, the distance between two adjacent first cutting lines is equal to the distance between two adjacent second cutting lines;

[0014] The lengths of the plurality of flattened sections are equal.

[0015] More preferably, two third cutting lines are provided in each flattened segment.

[0016] On the basis of the above technical solution, preferably, in step S2, a circular saw blade is used to cut the fan blades, and the two ends of the second cutting line on the top and bottom sides of the outer shell are respectively connected to the two third cutting lines, the two ends of the first cutting line on the top side of the outer shell are respectively connected to the two third cutting lines, and the two ends of the first cutting line on the bottom side of the outer shell are not connected to the third cutting lines.

[0017] More preferably, in step S3, the top side of the first split body is hoisted at the position of the web, so that the first split body and the second split body are flipped and folded in half, and then the fan blade is hoisted to the segment cutting device and cut into a plurality of the flattened segments.

[0018] More preferably, the circular saw blade comprises a saw disc body and an edge grinding blade, wherein a plurality of saw grooves are provided on the outer edge of the saw disc body, and two oblique grooves are provided in the saw disc body, wherein one end of the oblique groove away from the center point of the saw disc body is connected to the saw groove, and one end of the oblique groove away from the center point of the saw disc body is located in front of one end of the oblique groove close to the center point of the saw disc body along the rotation direction of the saw disc body;

[0019] The edge grinding blade is fixedly arranged in the inclined groove and extends out of the side of the saw disc body; two inclined grooves are arranged, each of which is provided with one edge grinding blade, and the two edge grinding blades extend out of the two sides of the saw disc body respectively;

[0020] An anti-crack hole is provided in the saw disc body, the anti-crack hole is connected with one end of the inclined groove close to the center point of the saw disc body, and the inner diameter of the anti-crack hole is larger than the inner diameter of the inclined groove.

[0021] More preferably, the edge grinding blade comprises a plurality of trimming portions and a plurality of buffer portions, the trimming portions and the buffer portions are arranged alternately and continuously, wherein the trimming portions are in a linear structure, one end of the trimming portion away from the center point of the saw disc body is located in front of one end of the trimming portion close to the center point of the saw disc body along the rotation direction of the saw disc body, and the plurality of trimming portions are parallel;

[0022] The buffer portion is in an arc shape, and the centers of the plurality of buffer portions coincide with the center point of the saw disk body.

[0023] On the basis of the above technical solution, preferably, in step S1, the fan blade is supported by using a cushion, and the cushion is located below the web and between two adjacent third dividing lines.

[0024] On the basis of the above technical solution, preferably, in step S4, the flattened segment is firstly extruded by using an extrusion device, and then the flattened segment after extrusion is placed in a crusher for crushing.

[0025] The method for recycling retired fan blades of the present invention has the following beneficial effects compared with the prior art:

[0026] (1) By setting the first cutting line, the second cutting line and the third cutting line, the first cutting line and the second cutting line are arranged on both sides of the web relative to each other, the third cutting line crosses the web, and at least one third cutting line is arranged in each flattening section, which can not only avoid the closed cavity when the fan blade is cut into sections, thereby ensuring the safety of the fan blade recovery process, but also reduce the width of the flattening section, so that it can be adapted to cutting devices of different specifications;

[0027] (2) By using a circular saw blade to cut the fan blade, the first and second parts can be fitted together for hoisting. By setting two third dividing lines in each flattened section, the flattened section can be easily hoisted, thereby improving the transportation efficiency of the fan blade;

[0028] (3) By providing an inclined groove and an edge grinding blade on the saw disc body, and configuring the edge grinding blade to include a cutting portion and a buffer portion, the cutting efficiency of the circular saw blade can be improved, the moving resistance of the circular saw blade can be reduced, and the service life of the circular saw blade can be guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 A top view of a fan blade in a method for recycling retired fan blades of the present invention;

[0031] Figure 2 A cross-sectional view of a fan blade in a method for recycling retired fan blades of the present invention;

[0032] Figure 3 It is a three-dimensional diagram of a first split body and a second split body in a hoisting state in a method for recycling retired wind turbine blades of the present invention;

[0033] Figure 4 A three-dimensional diagram of a flattened section made of a first split body in a method for recycling retired wind turbine blades of the present invention;

[0034] Figure 5 A three-dimensional diagram of a flattened section made of a second split body in a method for recycling retired wind turbine blades of the present invention;

[0035] Figure 6 It is a cross-sectional view of a circular saw blade cutting a fan blade in a method for recycling retired fan blades of the present invention;

[0036] Figure 7 It is a three-dimensional diagram of the edge grinding part in the method for recycling retired wind turbine blades of the present invention.

[0037] Among them: 1. fan blade; 110. outer shell; 120. web; 11. first split; 12. second split; 111. flattened section; 2. dividing line; 21. first dividing line; 22. second dividing line; 23. third dividing line; 3. circular saw blade; 31. saw disc body; 32. edging blade; 321. trimming part; 322. buffer part; 301. saw groove; 302. oblique groove; 303. anti-crack hole. DETAILED DESCRIPTION

[0038] The following will be combined with the specific implementation of the present invention to clearly and completely describe the technical solution in the present invention. Obviously, the described implementation is only a part of the implementation of the present invention, not all of the implementation. Based on the implementation of the present invention, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] like Figure 2 As shown, the wind blade 1 includes an outer shell 110 and at least one web 120, the outer shell 110 is a hollow structure, the web 120 is fixedly arranged in the outer shell 110, and when a plurality of webs 120 are provided, the plurality of webs 120 are arranged in parallel and at intervals. A method for recycling retired wind blades of the present invention is used for cutting and recycling the wind blades 1 to extract the glass fibers in the retired wind blades 1.

[0040] like Figure 1-7 As shown, a method for recycling retired wind turbine blades of the present invention comprises the following steps:

[0041] S1, supporting and fixing the fan blade 1 so that the fan blade 1 is spaced apart from the ground;

[0042] S2, cutting the fan blade 1 along the dividing line 2, dividing the fan blade 1 into a first sub-body 11 and a second sub-body 12, the length of the first sub-body 11 and the length of the second sub-body 12 are both equal to the length of the fan blade 1, that is, cutting the fan blade 1 along its length direction, so that the fan blade 1 with a larger width is divided into the first sub-body 11 and the second sub-body 12 with a smaller width, so that a smaller-sized segmenting device can be used to segment the fan blade 1, thereby improving the adaptability of the recovery tool;

[0043] S3, cutting the first sub-body 11 and the second sub-body 12 along the width direction of the fan blade 1 to separate the two into a plurality of flattened segments 111;

[0044] like Figure 1As shown, the dividing line 2 includes a plurality of first dividing lines 21, a plurality of second dividing lines 22 and a plurality of third dividing lines 23, the plurality of first dividing lines 21 are arranged at intervals along the length direction of the fan blade 1, the plurality of second dividing lines 22 are also arranged at intervals along the length direction of the fan blade 1, and the first dividing lines 21 and the second dividing lines 22 are arranged relatively on the web 120 ( Figure 1 The third cutting line 23 spans the web 120, and its two ends are respectively connected to a first cutting line 21 and a second cutting line 22, and at least one complete third cutting line 23 is provided in each flattened section 111, rather than only a part of the third cutting line 23, and the third cutting line 23 is not located at both ends of the flattened section 111; Figure 3 As shown, the webs 120 in the first sub-body 11 and the second sub-body 12 divided by the dividing line 2 are incomplete, and a notch is provided on the webs 120 in each flattened segment 111. When the flattened segment 111 is cut, even if the two ends of the flattened segment 111 are squeezed and closed by the segment cutting device, a closed cavity will not be formed inside the flattened segment 111, thereby ensuring the safety of the recovery operation of the fan blade 1.

[0045] S4, placing the flattened segments 111 into a crusher one by one and crushing them into blade fragments;

[0046] S5, vibrating the blade debris to stratify the blade debris according to the particle size, so as to re-crush the blade debris or control the amount of related reagents added according to the different particle sizes, and then recovering the glass fiber in the blade debris by pyrolysis or chemical solvent decomposition, wherein the pyrolysis or chemical solvent decomposition methods are both existing technologies.

[0047] like Figure 1 As shown, the directions of the first cutting line 21 and the second cutting line 22 are both parallel to the length direction of the fan blade 1, and the direction of the third cutting line 23 is inclined to the length direction of the fan blade 1; the direction of the third cutting line 23 is preferably at an angle of 30-60 degrees to the length direction of the fan blade 1. When the flattened segment 111 is cut, even if the third cutting line 23 is located at both ends of the flattened segment 111, a closed cavity will not be formed inside the flattened segment 111.

[0048] In order to improve the cutting regularity of the fan blade 1 and improve its crushing uniformity, it is preferred to make the spacing between two adjacent first cutting lines 21 and the spacing between two adjacent second cutting lines 22 equal, and make the lengths of multiple flattened sections 111 equal, so that each flattened section 111 made of the first split 11 is the same, and each flattened section 111 made of the second split 12 is also the same.

[0049] Two third cutting lines 23 are arranged in each flattening section 111. Figure 4As shown, the flattened section 111 is made by cutting the first split body 11, and the two third cutting lines 23 are located in the middle. At this time, the webs 120 on both sides of the third cutting lines 23 form a hanging ear structure with the shell 110. By hanging these two hanging ear structures, the convenience and stability of the flattened section 111 can be improved. Figure 5 As shown, the flattened segment 111 is made by cutting the second split body 12, and two third dividing lines 23 are located at its two end positions. At this time, the web 120 between the two third dividing lines 23 and the outer shell 110 form an ear-shaped structure. By hoisting this ear-shaped structure, the hoisting convenience and stability of the flattened segment 111 can also be improved, thereby improving the recovery efficiency of the wind turbine blade 1.

[0050] In step S1 , preferably, a block is used to support the fan blade 1 , and the block is located below the web 120 and between two adjacent third cutting lines 23 , so as to prevent the block from hindering the cutting of the fan blade 1 .

[0051] like Figure 3 As shown, after the fan blade 1 is divided into the first sub-body 11 and the second sub-body 12, the first sub-body 11 and the second sub-body 12 can be aligned and fitted together, and then hoisted to the segmentation device. In order to make the first sub-body 11 and the second sub-body 12 fit more firmly, in step S2, a circular saw blade 3 (the circular saw blade 3 is driven by a vehicle similar to an excavator, which is a prior art) is preferably used to cut the fan blade 1, such as Figure 6 As shown, since the circular saw blade 3 is in the shape of a disk, when the circular saw blade 3 cuts the fan blade 1 from top to bottom, the incision on the upper side of the fan blade 1 will be larger and the incision on the lower side will be smaller. Therefore, when the circular saw blade 3 is used to cut the first cutting line 21, the two ends of the first cutting line 21 on the top side of the shell 110 are respectively connected to the two third cutting lines 23, and the two ends of the first cutting line 21 on the bottom side of the shell 110 are not connected to the third cutting line 23; the two ends of the second cutting line 22 on the top and bottom sides of the shell 110 are respectively connected to the two third cutting lines 23 (increasing the length of the second cutting line 22 on the top side of the shell 110). After the fan blade 1 is cut in this way, there is an involvement structure between the bottom side of the first split body 11 and the bottom side of the second split body 12. When the first split body 11 and the second split body 12 are folded and fitted together, the involvement structure between the two can improve the degree of fixation of the two.

[0052] In order to achieve Figure 3In the hoisting method shown, in step S3, the top side of the first split body 11 is first hoisted at the position of the web 120, so that the first split body 11 and the second split body 12 are flipped and folded in half, and then the fan blade 1 is hoisted to the segment cutting device and cut into multiple flattened segments 111, thereby improving the transportation efficiency of the first split body 11 and the second split body 12.

[0053] In step S4 , the flattened segment 111 is firstly extruded by an extrusion device to reduce the thickness of the flattened segment 111 , and then the extruded flattened segment 111 is placed in a crusher for crushing, thereby improving the crushing efficiency of the flattened segment 111 .

[0054] When the circular saw blade 3 rotates, the fan blade 1 can be cut. As the cutting operation proceeds, a part of the circular saw blade 3 will extend into the dividing line 2. After the fan blade 1 is cut, there will be many burrs and residues at the incision position. The burrs and residues will rub against the side of the circular saw blade 3 to generate more heat and cause greater resistance to the rotation of the circular saw blade 3. In order to solve this problem, the structure of the circular saw blade 3 is improved, such as Figure 6 As shown, the circular saw blade 3 includes a saw disc body 31 and an edge grinding blade 32. The outer edge of the saw disc body 31 is provided with a plurality of saw grooves 301 for cutting the fan blades 1. Two inclined grooves 302 are provided in the saw disc body 31. The end of the inclined groove 302 away from the center point of the saw disc body 31 is connected to the saw groove 301, and the end of the inclined groove 302 away from the center point of the saw disc body 31 is located in front of the end of the inclined groove 302 close to the center point of the saw disc body 31 along the rotation direction of the saw disc body 31. The edge grinding blade 32 is fixedly arranged in the inclined groove 302. Specifically, On one side of the inclined groove 302 located behind the rotation direction of the saw disk body 31, the edge grinding blade 32 extends out of the side of the saw disk body 31, that is, it protrudes a certain length from the side of the saw disk body 31. There are two inclined grooves 302, each of which is provided with an edge grinding blade 32, and the two edge grinding blades 32 extend out of both sides of the circular saw blade 3 respectively; when the saw disk body 31 rotates, it can drive the edge grinding blades 32 on both sides to rotate, thereby cutting the side wall of the cutout of the fan blade 1 to remove burrs and residues that hinder the rotation of the saw disk body 31.

[0055] An anti-crack hole 303 is opened in the saw disk body 31, and the anti-crack hole 303 is connected with one end of the inclined groove 302 close to the center point of the saw disk body 31, and the inner diameter of the anti-crack hole 303 is larger than the inner diameter of the inclined groove 302. The setting of the anti-crack hole 303 can avoid the problem of tearing of the inner end of the inclined groove 302 due to excessive stress; at the same time, the burrs and residues cut off by the edge grinding blade 32 will accumulate in the inclined groove 302. Since the inner diameter of the anti-crack hole 303 is large and it is connected with the inclined groove 302, the storage capacity of burrs and residues can be increased, thereby reducing the rotation resistance of the circular saw blade 3.

[0056] The edge grinding blade 32 includes a plurality of trimming portions 321 and a plurality of buffer portions 322, which are arranged alternately and continuously. The trimming portions 321 are in a linear structure, and one end of the trimming portion 321 away from the center point of the saw disc body 31 is located in front of the end of the trimming portion 321 close to the center point of the saw disc body 31 along the rotation direction of the saw disc body 31, and the plurality of trimming portions 321 are parallel; the buffer portion 322 is in an arc shape, and the center of the plurality of buffer portions 322 coincides with the center point of the saw disc body 31; Figure 7 As shown, a plurality of trimming portions 321 and a plurality of buffer portions 322 are alternately and continuously arranged to form a shape similar to lightning. Since the buffer portion 322 is an arc-shaped structure with its center at the center point of the saw disk body 31, when the saw disk body 31 rotates, the buffer portion 322 will not cut the burrs and residues on the inner wall of the cutout of the fan blade 1. The setting of the buffer portion 322 can not only provide good support for the trimming portion 321 in the rotation direction of the saw disk body 31, but also allow a plurality of trimming portions 321 to have intervals therebetween, thereby avoiding the problem that the burrs and residues cut out by the plurality of trimming portions 321 due to being located on the same straight line form a larger material roll, thereby clogging the inclined groove 302. This not only ensures the service life of the edge grinding blade 32, but also reduces the operating energy consumption of the circular saw blade 3.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for recycling retired wind turbine blades, characterized in that: The following steps are involved: S1, supporting and fixing a fan blade (1), wherein the fan blade (1) comprises an outer shell (110) and at least one web (120), and the web (120) is fixedly arranged in the outer shell (110); S2, cutting the fan blade (1) along a dividing line (2) to divide it into a first sub-body (11) and a second sub-body (12), wherein the length of the first sub-body (11) and the length of the second sub-body (12) are both equal to the length of the fan blade (1), wherein: The dividing lines (2) include a plurality of first dividing lines (21), a plurality of second dividing lines (22) and a plurality of third dividing lines (23); the plurality of first dividing lines (21) and the plurality of second dividing lines (22) are arranged at intervals along the length direction of the fan blade (1), and the two are arranged oppositely on two sides of the web (120); the third dividing line (23) spans the web (120), and its two ends are respectively connected to one of the first dividing lines (21) and one of the second dividing lines (22); S3, cutting the first sub-body (11) and the second sub-body (12) along the width direction of the fan blade (1) to separate the two into a plurality of flattened segments (111), wherein each of the flattened segments (111) is provided with at least one third cutting line (23); S4, placing the flattened segments (111) into a crusher one by one to be crushed into blade fragments; S5, performing a vibration treatment on the blade debris, and then recovering the glass fibers in the blade debris by using a pyrolysis or chemical solvent decomposition method; The direction of the first cutting line (21) and the direction of the second cutting line (22) are both parallel to the length direction of the fan blade (1), and the direction of the third cutting line (23) is inclined to the length direction of the fan blade (1); The distance between two adjacent first cutting lines (21) and the distance between two adjacent second cutting lines (22) are equal; The lengths of the plurality of flattened sections (111) are equal; Two third cutting lines (23) are arranged in each of the flattened sections (111); In step S2, the fan blade (1) is cut using a circular saw blade (3), wherein the two ends of the second cutting line (22) on the top and bottom sides of the housing (110) are respectively connected to the two third cutting lines (23), the two ends of the first cutting line (21) on the top side of the housing (110) are respectively connected to the two third cutting lines (23), and the two ends of the first cutting line (21) on the bottom side of the housing (110) are not connected to the third cutting lines (23).

2. The method for recycling retired wind turbine blades according to claim 1, characterized in that: In step S3, the top side of the first sub-body (11) is first hoisted at a position located at the web (120), so that the first sub-body (11) and the second sub-body (12) are turned over and folded in half, and then the fan blade (1) is hoisted to a segment cutting device and cut into a plurality of the flattened segments (111).

3. The method for recycling retired wind turbine blades according to claim 1, characterized in that: The circular saw blade (3) comprises a saw blade body (31) and an edge grinding blade (32), wherein: A plurality of saw grooves (301) are formed on the outer edge of the saw disc body (31), and two oblique grooves (302) are formed in the saw disc body (31), and one end of the oblique groove (302) away from the center point of the saw disc body (31) is connected to the saw groove (301), and one end of the oblique groove (302) away from the center point of the saw disc body (31) is located in front of one end of the oblique groove (302) close to the center point of the saw disc body (31) along the rotation direction of the saw disc body (31); The edge grinding blade (32) is fixedly arranged in the inclined groove (302) and extends out of the side of the saw disc body (31); two inclined grooves (302) are provided, one edge grinding blade (32) is arranged in each inclined groove (302), and the two edge grinding blades (32) extend out of two sides of the saw disc body (31) respectively; An anti-crack hole (303) is provided in the saw disc body (31), the anti-crack hole (303) is connected to an end of the inclined groove (302) close to the center point of the saw disc body (31), and the inner diameter of the anti-crack hole (303) is greater than the inner diameter of the inclined groove (302).

4. The method for recycling retired wind turbine blades according to claim 3, characterized in that: The edge grinding blade (32) comprises a plurality of edge cutting portions (321) and a plurality of buffer portions (322), wherein the edge cutting portions (321) and the buffer portions (322) are arranged alternately and continuously, wherein: The trimming portion (321) is in a linear structure, one end of the trimming portion (321) away from the center point of the saw disc body (31) is located in front of one end of the trimming portion (321) close to the center point of the saw disc body (31) along the rotation direction of the saw disc body (31), and a plurality of the trimming portions (321) are parallel; The buffer portion (322) is in an arc shape, and the centers of a plurality of the buffer portions (322) coincide with the center point of the saw disc body (31).

5. The method for recycling retired wind turbine blades according to claim 1, characterized in that: In step S1, the fan blade (1) is supported by using a cushion, wherein the cushion is located below the web (120) and between two adjacent third dividing lines (23).

6. The method for recycling retired wind turbine blades according to claim 1, characterized in that: In step S4, the flattened segment (111) is firstly squeezed using an extrusion device, and then the squeezed flattened segment (111) is placed in a crusher for crushing.

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