A cutting method for decommissioned wind turbine blade spars

Abstract

The application discloses a kind of cutting methods of decommissioned wind power blade girder, comprising the following steps: S1: girder screening, the girder of unqualified size executes step S2, and the girder of qualified size executes step S3;S2: the unqualified size girder is sent to first cutting platform, and is cut into qualified size;S3: web cutting is carried out in second cutting platform;S4: skin cutting is carried out in third cutting platform, and girder plate is made: S5: girder plate is cut into girder strip in fourth cutting platform.Compared with prior art, first web and skin are removed, and then girder strip is made after obtaining qualified size girder plate.Because the size of girder plate is qualified, so qualified size girder strip can be directly made through fourth cutting platform, effectively solve the problems of low cutting efficiency, high cost and large size deviation of girder strip in prior art.

Description

Technical Field

[0001] This invention relates to the field of wind power processing technology, and more specifically, to a method for cutting the main beam of a decommissioned wind turbine blade. Background Technology

[0002] With the arrival of the "retirement wave" of wind turbine generators, wind turbine blades and other components will also be decommissioned on a large scale along with the aging turbines. Therefore, there is an urgent need for a feasible recycling and reuse method to solve the problem of recycling waste wind turbine blades. The main beam part of the retired wind turbine blade has good mechanical properties, but the cut wind turbine blade plates are difficult to process further because each piece has a different shape. The subsequent processing is slow and costly. The existing processing method for wind turbine blade plates is to cut the main beam plate into main beam strips one by one, and then cut off the web surface one by one, and then cut off the skin surface one by one. It can be seen that the existing technology for processing the main beam plate has the problems of low processing efficiency and high processing cost. Because processing into main beam strips first and then removing the web surface and skin surface can effectively reduce the amount of cutting of the main beam. For example, when the web surface of the main beam is located in the non-web connection area (i.e., far away from the connection between the web and the main beam) and the surface is close to a plane, if the error is within the tolerance range, surface removal can be omitted. This also explains the low processing efficiency (each main beam requires manual measurement) and large dimensional deviations in the processed main beams in existing technologies. Therefore, there is an urgent need for a method to cut the main beam plates of retired wind turbine blades to solve these problems. Summary of the Invention

[0003] The summary section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. The summary section of this invention is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0004] To at least partially solve the above problems, the present invention provides a method for cutting the main beam of a decommissioned wind turbine blade, comprising the following steps:

[0005] S1: Main beam screening. For main beams that do not meet the size requirements, proceed to step S2. For main beams that meet the size requirements, proceed to step S3.

[0006] S2: Send the main beam with unqualified dimensions to the first cutting platform and cut it to the qualified dimensions;

[0007] S3: Perform web cutting on the second cutting platform;

[0008] S4: Skin cutting is performed on the third cutting platform to produce the main beam plate:

[0009] S5: Cut the main beam plate into main beam strips on the fourth cutting platform.

[0010] Preferably, step S1 includes:

[0011] S101: Place the main beam skin downwards on the conveyor;

[0012] S102: The conveying device delivers the main beam to the identification system;

[0013] S103: The identification system identifies the dimensions of the main beam. If the main beam has unqualified dimensions, step S2 is executed; if the main beam has qualified dimensions, step S3 is executed.

[0014] Preferably, the dimensions of the main beam include width, curvature, and thickness.

[0015] Preferably, the width of the main beam with acceptable dimensions is less than 350 mm.

[0016] Preferably, the recognition system is a visual recognition system.

[0017] Preferably, the first and fourth cutting platforms are longitudinal saw platforms, the fourth cutting platform has at least two parallel cutting saw blades, and the second and third cutting platforms are cutting saw platforms.

[0018] Preferably, step S2 includes:

[0019] S201: Place the main beam on the first cutting platform;

[0020] S202: The first cutting platform cuts the main beam into qualified main beams along the width direction.

[0021] Preferably, step S3 includes:

[0022] S301: Place the main beam skin downwards on the second cutting platform;

[0023] S302: The second cutting platform removes the web surface of the main beam to form a main beam with a reference plane. The plane cut by the second cutting platform is the first reference plane.

[0024] Preferably, step S4 includes:

[0025] S401: The main beam with the first reference plane is transported from the second cutting platform to the transfer equipment;

[0026] S402: The transfer device flips the main beam with the first reference plane so that the first reference plane is facing down and the skin is facing up;

[0027] S403: The flipped main beam is transported to the third cutting platform by the transfer equipment;

[0028] S404: The third cutting platform removes the skin surface of the main beam to form a main beam plate with two reference planes. The plane cut by the third cutting platform is the second reference plane.

[0029] Preferably, step S5 includes:

[0030] S501: Place the main beam plate with the first or second reference surface facing down on the fourth cutting platform;

[0031] S502: The fourth cutting platform clamps the main beam plate and cuts it into rectangular main beam strips.

[0032] Compared with the prior art, the present invention has at least the following beneficial effects:

[0033] Compared to existing technologies that first process the main beam strips and then remove the web and skin, this method first removes the web and skin to obtain a main beam plate with acceptable dimensions, and then manufactures the main beam strips. Because the main beam plate has acceptable dimensions, the fourth cutting platform can directly produce main beam strips with acceptable dimensions, effectively solving the problems of low cutting efficiency, high cost, and large dimensional deviations of the main beam strips in existing technologies.

[0034] The cutting method for the main beam of decommissioned wind turbine blades described in this invention, and other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0035] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0036] Figure 1 This is a flowchart of the cutting method for the main beam of a decommissioned wind turbine blade according to the present invention.

[0037] Figure 2 This is a schematic diagram of the transfer equipment.

[0038] Figure 3 This is a schematic diagram of the drive frame.

[0039] Figure 4 This is a schematic diagram of the rotating frame.

[0040] Figure 5 for Figure 4 A partial structural diagram (partial structures are not shown).

[0041] Figure 6 This is a schematic diagram of the abutment component and the second lifting system (not all fixing bars are shown).

[0042] Figure 7 This is a schematic diagram of the abutment component.

[0043] Figure 8 This is a schematic diagram of the rotating frame flipping.

[0044] In the diagram: 1 Adjustment base, 2 First motor, 3 Drive frame, 31 Mounting box, 32 Second motor, 33 Second transmission device, 34 Drive wheel set, 4 Rotating frame, 41 Drive ring, 41a First ring, 41b Second ring, 42 Connecting rod, 43 First lifting system, 44 First transfer table, 45 Second transfer table, 5 Fixing strip, 6 Abutment piece, 61 Telescopic device, 62 Abutment joint, 63 Sensor, 64 Abutment wheel, 7 Second lifting system. Detailed Implementation

[0045] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments, so that those skilled in the art can implement it based on the description.

[0046] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0047] This invention provides a method for cutting the main beam of a decommissioned wind turbine blade, comprising the following steps:

[0048] S1: Main beam screening. For main beams that do not meet the size requirements, proceed to step S2. For main beams that meet the size requirements, proceed to step S3.

[0049] S2: Send the main beam with unqualified dimensions to the first cutting platform and cut it to the qualified dimensions;

[0050] S3: Perform web cutting on the second cutting platform;

[0051] S4: Skin cutting is performed on the third cutting platform to produce the main beam plate:

[0052] S5: Cut the main beam plate into main beam strips on the fourth cutting platform.

[0053] The working principle and beneficial effects of the above technical solution are as follows: Through the design of the above structure, the blade main beam can be cut into large sections, segment by segment. Before cutting into main beam strips, the main beam is screened by size, and those with unqualified dimensions are processed into qualified main beams. This ensures that the length of the cut main beam strips is within tolerance before proceeding to the next processing step. Screening and cutting unqualified main beams also ensures that the main beam dimensions are compatible with the second to fourth cutting platforms. The second and third cutting platforms allow the curved main beam to be processed into rectangular main beam plates, ensuring that the width and thickness of the main beam strips cut by the fourth cutting platform are consistent. Therefore, compared to the existing technology of processing the main beam strips first and then removing the web and skin, this method first removes the web and skin to obtain a qualified main beam plate before manufacturing the main beam strips. Because the main beam plate is of qualified dimensions, the fourth cutting platform can directly produce qualified main beam strips, effectively solving the problems of low cutting efficiency, high cost, and large dimensional deviations of the main beam strips in the existing technology.

[0054] Furthermore, in this embodiment, we provide a specific cutting method, the steps of which are as follows:

[0055] S101: Place the main beam skin-down onto the conveying device, which is a commercially available product or any existing technology capable of transferring the main beam. The transfer and transmission of the main beam between the various cutting platforms and transfer devices in the following steps can be carried out using the conveying device.

[0056] S102: The conveying device delivers the main beam to the identification system, which is a visual identification system. The visual identification system can be a commercially available product or existing technology.

[0057] S103: The identification system identifies the dimensions of the main beam. If the main beam has unqualified dimensions, step S2 is executed; if the main beam has qualified dimensions, step S3 is executed.

[0058] The dimensions of the main beam include its width (the width of a qualified main beam is less than 350 mm), curvature, and thickness (the distance between the parallel tangents of the inner and outer circles of the main beam).

[0059] S201: Place the main beam on the first cutting platform, which is a longitudinal saw platform;

[0060] S202: The first cutting platform cuts the main beam into qualified main beams along the width direction, thereby ensuring that the length of the processed main beam strips is within the tolerance range, and thus the processing accuracy of the main beam strips produced by this method is much higher than that of the existing technology.

[0061] S301: Place the main beam skin downwards on the second cutting platform, which is a cutting saw platform;

[0062] S302: The second cutting platform cuts off the web of the main beam and the web surface connected to the web to form a main beam with a reference plane. The plane cut by the second cutting platform is the first reference plane.

[0063] S401: The main beam with the first reference plane is transported from the second cutting platform to the transfer equipment;

[0064] S402: The transfer device flips the main beam with the first reference plane so that the first reference plane is facing down and the skin is facing up;

[0065] S403: The flipped main beam is transported by the transfer equipment to the third cutting platform, which is a cutting saw platform;

[0066] S404: The third cutting platform removes the skin of the main beam and the skin surface connected to the skin to form a main beam plate with two reference planes. The plane cut by the third cutting platform is the second reference plane. Because the first reference plane is facing down when the skin is cut by the third cutting platform, the thickness of the main beam plate can be adjusted by adjusting the relative height between the cutting saw and the first reference plane, thereby controlling the thickness of the main beam strip. The distance between the first reference plane and the second reference plane is the thickness of the main beam strip.

[0067] S501: Place the main beam plate with its first or second reference surface facing down on the fourth cutting platform. The fourth cutting platform is a longitudinal saw platform and has at least two parallel cutting saw blades.

[0068] S502: The fourth cutting platform clamps the main beam plate and cuts it into several rectangular main beam strips according to the dimensional requirements. Because the distance between two adjacent cutting saw blades on the fourth cutting platform is fixed, the width of the cut main beam strips is consistent.

[0069] The above method allows for control of the length, width, and thickness of the main beam strip with very few operational steps. As a result, compared to existing technologies, this method not only requires virtually no manual intervention but also boasts extremely high processing precision.

[0070] In the previous embodiment, we mentioned that a first reference surface can be processed on the second cutting platform, and then the main beam plate is placed on the third cutting platform with the first reference surface as the bottom surface, thereby controlling the thickness of the main beam plate. Since the main beam plate needs to be flipped, manual flipping requires large equipment such as gantry cranes, which consumes manpower for hoisting and position calibration. If a robotic arm (such as the transport device described in patent number CN202211323672) is used for transfer and flipping, it requires increased production investment to purchase the robotic arm and perform corresponding program editing, which increases production costs. To achieve main beam flipping while reducing equipment investment, the flipping device provided in patent number CN201711436371 can be used. However, this device and other existing flipping devices on the market require a large floor area. Therefore, to achieve main beam flipping while reducing the floor area of ​​the equipment, this invention further provides a transfer device applied to this cutting production line for transporting and flipping a main beam with a reference surface.

[0071] In this embodiment, the transfer device consists of an adjustment base 1 and a flipping device. The flipping device is located on the top of the adjustment base 1. A first motor 2 is provided on the adjustment base 1. The first motor 2 is connected to the bottom surface of the flipping device through a first transmission device. The first transmission device can be a combination of gears and screws, or a combination of pulleys and belts, as long as the first motor 2 can drive the flipping device to move horizontally along the adjustment base 1 through the first transmission device.

[0072] The adjusting base 1 is located between the discharge end of the second cutting platform and the feed end of the third cutting platform. The adjusting base 1 is used to adjust the relative position of the tilting device with respect to the second and third cutting platforms. Figure 2 As shown.

[0073] When the factory area is small, the second and third cutting platforms can be set up in parallel, with the main beam having a reference plane entering and exiting from the same end of the tilting device. That is, the main beam having a reference plane is conveyed from the discharge end of the second cutting platform to the tilting device. The tilting device tilts the main beam having a reference plane and simultaneously moves it to the third cutting platform. After tilting, the main beam having a reference plane is in a state with the first reference plane facing down and the skin facing up. Then, it is conveyed by the tilting device to the feed end of the third cutting platform and enters the third cutting platform.

[0074] When the factory area is large, the second and third cutting platforms can be located on the same straight line. The main beam with a reference surface enters from one end of the flipping device and exits from the other end. The main beam with a reference surface is transported from the discharge end of the second cutting platform to the flipping device. The flipping device flips the main beam with a reference surface. After the flipping is completed, the main beam with a reference surface is in a state with the first reference surface facing down and the skin facing up. Then it is transported from the other end of the flipping device to the feed end of the third cutting platform.

[0075] The flipping device consists of a drive frame 3 and a rotating frame 4. The drive frame 3 is disposed on the top surface of the adjusting base 1 and is movably connected to the adjusting base 1 via a first transmission device. The rotating frame 4 is disposed on the drive frame 3 and is movably connected to the drive frame 3. The drive frame 3 is used to drive the rotating frame 4 to rotate.

[0076] The drive frame 3 consists of a mounting box 31, a second motor 32, a second transmission device 33, and at least one set of drive wheel sets 34. The mounting box 31 is equipped with tie rods. Typically, there are two sets of drive wheel sets 34, symmetrically arranged on the two inner side walls of the mounting box 31. Each drive wheel set 34 consists of several rollers movably connected to the mounting box 31. The second motor 32 and the second transmission device 33 are both located within the mounting box 31. The second motor 32 is connected to the drive wheel sets 34 via the second transmission device 33. The second transmission device 33 can be a combination of gears and screws, or a combination of pulleys and belts, as long as the second motor 32 can drive at least one roller (in contact with the rotating frame 4) within the drive wheel set 34 to rotate via the second transmission device 33.

[0077] The rotating shaft on the roller of the drive wheel assembly 34 is typically connected at one end to the inner wall of the mounting box 31, and at the other end to a tie rod adjacent to that inner wall. For example... Figure 3 As shown, the top of the mounting box 31 is provided with an arc-shaped groove adapted to the rotating frame 4. The drive wheel set 34 is adapted to the arc-shaped groove, and the rotation center axis of the rollers of the drive wheel set 34 is parallel to the rotation center axis of the rotating frame 4. The outer edge of the rotating frame 4 is movably connected to the drive wheel set 34, and at least ensures that the outer edge of the rotating frame 4 is always connected to the rollers driven by the second transmission device 33. When the second motor 32 drives the rollers of the drive wheel set 34 to rotate through the second transmission device 33, the rollers can drive the rotating frame 4 to rotate relative to the drive frame 3.

[0078] The rotating frame 4 consists of two circular drive rings 41, a first lifting system 43, a first transfer platform 44, and a second transfer platform 45. The two circular drive rings 41 are a first ring 41a and a second ring 41b, respectively, and are connected by a connecting rod 42. Figure 6 As shown.

[0079] When the second and third cutting platforms are set in parallel, the main beam with a reference plane enters the rotating frame 4 through the first ring 41a and leaves the rotating frame 4 through the first ring 41a after rotation.

[0080] When the second cutting platform and the third cutting platform are on the same straight line, the main beam with a reference plane enters the rotating frame 4 through the first ring 41a and leaves the rotating frame 4 through the second ring 41b after rotation.

[0081] The first lifting system 43 is typically configured in a set, with each set including two first lifting systems 43. A first transfer platform 44 and a second transfer platform 45 are located between the two first lifting systems 43. The two opposite outer walls of the first transfer platform 44 are connected to the two first lifting systems 43, and the two opposite outer walls of the second transfer platform 45 are also connected to the two first lifting systems 43. The first lifting system 43 is a commercially available product or existing technology capable of lifting the two transfer platforms. Both transfer platforms are commercially available products or existing technologies capable of supporting and transporting the main beam. For example, they can be... Figure 8 The conveyor roller shown serves as a transfer platform.

[0082] Furthermore, in order to facilitate the transfer of the main beam between the cutting platform and the transfer platform, both the first transfer platform 44 and the second transfer platform 45 can be driven by a third motor to transfer the main beam. For example, the first transfer platform 44 and the second transfer platform 45 can be a conveyor belt platform driven by a third motor or a transmission roller platform driven by a third motor.

[0083] When only one set (two in total) of first lifting systems 43 is set, the two first lifting systems 43 can control the lifting of the first transfer platform 44 and the second transfer platform 45 respectively; alternatively, the two first lifting systems 43 can simultaneously control the lifting of the first transfer platform 44 and the second transfer platform 45. Typically, when controlled simultaneously, the first transfer platform 44 and the second transfer platform 45 move synchronously relative to each other. For example, when the first transfer platform 44 moves downward, the second transfer platform 45 rises; when the first transfer platform 44 rises, the second transfer platform 45 moves upward. Because the main beam is usually quite heavy, to ensure stability during tilting and transfer, two sets (four in total) of first lifting systems 43 can be set, meaning each transfer platform can be connected to four first lifting systems 43, such as... Figure 4 As shown.

[0084] Furthermore, to ensure that the main beam, which has a reference plane, will not fall through the gap between the first transfer table 44 and the second transfer table 45 when it is flipped, fixing strips 5 are provided on the two opposite side walls of the first transfer table 44 and the two opposite side walls of the second transfer table 45. The fixing strips 5 are C-shaped, with their openings facing the other transfer table. Figure 5 As shown, the opening of the fixing strip 5 of the second transfer table 45 faces the first transfer table 44, and the opening of the fixing strip 5 of the first transfer table 44 faces the second transfer table 45. Both the first transfer table 44 and the second transfer table 45 are connected to the first lifting system 43 through the fixing strip 5. The fixing strip 5 contains an abutment 6 and a second lifting system 7. The abutment 6 is mounted on the second lifting system 7. The second lifting system 7 is a commercially available product or any existing technology capable of moving the abutment 6, such as... Figure 6 As shown.

[0085] The abutment member 6 consists of a telescopic device 61 connected to the second lifting system 7, and an abutment joint 62 disposed on the telescopic device 61. The telescopic device 61 is a commercially available product or any existing technology capable of driving the abutment joint 62 to translate. A sensor 63 extending to the abutment joint 62 is disposed on the telescopic device 61 for monitoring the force on the abutment joint 62. At least two abutment wheels 64 extending away from the telescopic device 61 are disposed on the abutment joint 62. The abutment wheels 64 are movably connected to the abutment joint 62 and are rubber wheels, such as... Figure 7 As shown.

[0086] Taking the rotating frame 4 flipping a main beam with a reference plane when the second and third cutting platforms are on the same straight line as an example, in order to further optimize the flipping and transfer efficiency, in this embodiment, in addition to the two cutting platforms being on the same straight line, the discharge end of the second cutting platform is located below the feed end of the third cutting platform, thereby reducing the time wasted when the transfer table moves down. The steps are as follows:

[0087] S601: The main beam with a reference plane is conveyed from the discharge end of the second cutting platform to the first transfer table 44, at which time the first transfer table 44 is located below the second transfer table 45.

[0088] S602: The second lifting system 7 of the first transfer table 44 drives the abutment member 6 to rise, and the telescopic device 61 drives the abutment member 62 to abut against the side wall of the main beam with a reference surface. The second transfer table 45 moves downward, as... Figure 8 As shown in A;

[0089] S603: The second transfer table 45 abuts against the first reference surface of the main beam, which has a reference surface, such as... Figure 8 As shown in B;

[0090] S604: The drive frame 3 drives the rotating frame 4 to rotate 180 degrees. At this time, the second transfer table 45 is located below the first transfer table 44. The second transfer table 45 supports the main beam with a reference plane, such as... Figure 8 As shown in C;

[0091] S605: The telescopic device 61 drives the abutment joint 62 to reset, the first transfer table 44 moves upward (or the second transfer table 45 moves downward to be flush with the feed end of the third cutting platform), releasing the constraint on the main beam with a reference plane, such as... Figure 8 As shown in D;

[0092] S606: After the main beam with a reference plane is moved from the second transfer table 45 to the third cutting platform, the second transfer table 45 and the first transfer table 44 move downwards, as follows: Figure 8 As shown in E;

[0093] S607: The second transfer table 45 moves to a position flush with the discharge end of the second cutting platform, and the first transfer table 44 moves to the initial position of the second transfer table 45 in step S601, as follows. Figure 8 As shown in F.

[0094] The above structural design allows the main beam to be flipped with minimal floor space.

[0095] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0096] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0097] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. Other modifications can be easily made by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A method for cutting the main beam of a decommissioned wind turbine blade, characterized in that, The steps include the following: S1: Main beam screening. For main beams that do not meet the size requirements, proceed to step S2. For main beams that meet the size requirements, proceed to step S3. S2: Send the main beam with unqualified dimensions to the first cutting platform and cut it to the qualified dimensions; S3: Perform web cutting on the second cutting platform; S4: Skin cutting is performed on the third cutting platform to produce the main beam plate: S5: Cut the main beam plate into main beam strips on the fourth cutting platform; Step S3 includes: S301: Place the main beam skin downwards on the second cutting platform; S302: The second cutting platform cuts off the web surface of the main beam to form a main beam with a reference plane. The plane cut by the second cutting platform is the first reference plane. Step S4 includes: S401: The main beam with the first reference plane is transported from the second cutting platform to the transfer equipment; S402: The transfer device flips the main beam with the first reference plane so that the first reference plane is facing down and the skin is facing up; S403: The flipped main beam is transported to the third cutting platform by the transfer equipment; S404: The third cutting platform removes the skin surface of the main beam to form a main beam plate with two reference planes. The plane cut by the third cutting platform is the second reference plane. Step S5 includes: S501: Place the main beam plate with the first or second reference surface facing down on the fourth cutting platform; S502: The fourth cutting platform clamps the main beam plate and cuts it into rectangular main beam strips.

2. The method for cutting the main beam of a decommissioned wind turbine blade according to claim 1, characterized in that, Step S1 includes: S101: Place the main beam skin downwards on the conveyor; S102: The conveying device delivers the main beam to the identification system; S103: The identification system identifies the dimensions of the main beam. If the main beam has unqualified dimensions, step S2 is executed; if the main beam has qualified dimensions, step S3 is executed.

3. The method for cutting the main beam of a decommissioned wind turbine blade according to claim 1, characterized in that, The dimensions of the main beam include its width, curvature, and thickness.

4. The method for cutting the main beam of a decommissioned wind turbine blade according to claim 3, characterized in that, The width of the main beam that meets the required dimensions is less than 350 mm.

5. The method for cutting the main beam of a decommissioned wind turbine blade according to claim 2, characterized in that, The recognition system is a visual recognition system.

6. The method for cutting the main beam of a decommissioned wind turbine blade according to claim 1, characterized in that, The first and fourth cutting platforms are longitudinal saw platforms, with the fourth cutting platform having at least two parallel cutting saw blades. The second and third cutting platforms are cutting saw platforms.

7. The method for cutting the main beam of a decommissioned wind turbine blade according to claim 1, characterized in that, Step S2 includes: S201: Place the main beam on the first cutting platform; S202: The first cutting platform cuts the main beam into qualified main beams along the width direction.

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